• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention is to improve the reliability of the pouch-type secondary battery by protecting the battery from external shock by adding a separate reinforcing structure to the pouch case and the electrode assembly accommodated therein, the first electrode plate and the second electrode plate is a separator An electrode assembly disposed between the first and second electrode plates, the first and second terminal portions extending from the first and second electrode plates, a pouch case in which one surface is opened to accommodate the electrode assembly, and an opening of the pouch case. And at least one electrode pin fastened to the at least one through hole and at least one of the first and second terminal portions of the electrode assembly to be electrically connected to the electrode pin. The pouch cover and being exposed to the outside of the pouch cover, wherein the first and second The present invention relates to a pouch-type secondary battery comprising a first lead portion and a second lead portion electrically connected to a terminal portion.
    公开号:KR20040003153A
    申请号:KR1020020037514
    申请日:2002-06-29
    公开日:2004-01-13
    发明作者:김상범；김창호；장윤한
    申请人:삼성에스디아이 주식회사；
    IPC主号:
    专利说明:

    Pouch type secondary battery
    [12] The present invention relates to a secondary battery, and more particularly, to a pouch type secondary battery having improved reinforcing structure in a secondary battery having a pouch packaging material.
    [13] In general, secondary batteries are rechargeable and can be miniaturized and large-capacity. Typically, nickel-hydrogen (Ni-MH) batteries and lithium (Li) secondary batteries are used.
    [14] The secondary battery may be classified into a cylindrical battery using a cylindrical aluminum can, a square battery using a square aluminum can, and a pouch-type battery housed in a thin pouch case according to the appearance of a case housing the electrode plate assembly.
    [15] As shown in FIG. 1, the pouch type secondary battery includes an electrode assembly 10 generating a predetermined current and a pouch case 20 surrounding and sealing the electrode assembly 10. The electrode assembly 10 has a lead 12 connected to an electrode tab 11 extending from one side thereof, which serves as an electrical path to the outside, and the lead 12 has an electrode tape 13 on its surface. Is attached to be installed to protrude to the outside of the pouch case 20.
    [16] The pouch case 20 includes a case body 22 having an inner space provided therein for mounting the electrode assembly 10 and a cover 24 integrally extending from one end of the case body 22. A flange 22a is formed at the edge of the case main body 22 to be joined to the cover 24 to seal the case main body 22.
    [17] The pouch case 20 of the pouch-type secondary battery having the above structure is made of a thin plate mixed with a metal material and a resin material. As can be seen in FIG. 2, a polymer is formed on the inner surface of the metal thin plate 20a such as aluminum. Modified polypropylene, such as resin, for example, CPP (Casted Polypropylene) forms the heat adhesive layer 20b, and the outer surface of the resin material 20c such as nylon or polyethylene terephthalate (PET) via the heat adhesive layer 20b. Compressed composite material. In addition, the pouch case may have various forms such as a case having a structure as described in US Pat. Nos. 6,042,966 and 6,106,973.
    [18] However, since the pouch case having the above structure is formed very thin, there is a limit to the case protecting the electrode assembly housed therein. In particular, in such a pouch case, the aluminum thin plate added to maintain the strength as the case is vulnerable to external impact since its thickness is only a few tens of micrometers.
    [19] Therefore, the battery using the conventional pouch case may impair the safety of the battery when the battery is cut or hit by a sharp tool or the like, thereby reducing the reliability of the battery.
    [20] In addition, in the case of a battery having a stacked electrode assembly, such as a lithium polymer secondary battery, the stacked electrode assembly accommodated in the pouch packaging material has a bi-cell laminate 30 as shown in FIG. 3. The bi-cell stack 30 serves as one small unit forming the electrode assembly, and has a structure in which the positive electrode plates 32 are laminated on both sides of the negative electrode plate 31 via the separator 33. As shown in FIG. 3, the bi-cell laminate 30 has a separator 33 that separates the negative electrode plate 31 and the positive electrode plate 32 from the widest area, and then the negative plate 31 is formed wide. And, the positive electrode plate 32 is formed the smallest. Thus, a plurality of stacked bi-cell stacks 30 are stacked to form an electrode assembly.
    [21] However, when the electrode assembly formed by stacking the bi-cell laminate 30 is stored in the pouch case as described above, a problem may occur due to a swelling phenomenon in which gas is generated inside the battery according to charging and discharging of the battery. have. That is, when gas is generated inside the electrode plates of the electrode assembly, the electrode plates swell in the direction of the arrow in FIG. 3, whereby the positive electrode plate 32 and the negative electrode plate 31 are short-circuited at their edges. It becomes possible.
    [22] Therefore, it is necessary to prevent the short circuit of the battery due to the volume expansion of the electrode assembly as described above.
    [23] The present invention is to solve the above problems, the object of the present invention to improve the reliability of the pouch type secondary battery by protecting the battery from external impact by adding a separate reinforcing structure to the pouch case and the electrode assembly accommodated therein. have.
    [24] Another object of the present invention is to alleviate the change in the outer dimensions due to the volume expansion of the electrode assembly to improve the reliability of the battery.
    [1] 1 is an exploded perspective view illustrating a conventional pouch type secondary battery.
    [2] 2 is a cross-sectional view showing the material of a typical pouch case.
    [3] 3 is a cross-sectional view showing a bi-cell stack of the stacked electrode assembly.
    [4] 4 and 5 are an exploded perspective view and a perspective view showing a pouch type secondary battery according to an embodiment of the present invention, respectively.
    [5] 6A and 6B are exploded perspective views and cross-sectional views respectively illustrating a pouch cover and electrode pins fastened to the pouch cover according to an exemplary embodiment of the present invention.
    [6] 7 is an exploded perspective view showing a state in which the pouch cover and the electrode assembly are coupled according to an embodiment of the present invention.
    [7] 8A and 8B are partially enlarged perspective views illustrating a state in which an electrode terminal portion is coupled to an inner surface of an electrode pin in FIG. 7.
    [8] 9 and 10 are exploded perspective and perspective views respectively illustrating a pouch type secondary battery according to another exemplary embodiment of the present invention.
    [9] 11A to 11C are views showing a state where a plate-like reinforcing member is in close contact with an electrode assembly according to still another preferred embodiment of the present invention.
    [10] 12A and 12B are views illustrating a state in which a reinforcing member is in close contact with an electrode assembly according to still another preferred embodiment of the present invention.
    [11] 13A to 13D are views illustrating a state in which an insulating tape and a terminal cover are coupled to an electrode assembly according to still other preferred embodiments of the present invention.
    [25] The present invention for achieving the above object is provided with a first electrode plate and a second electrode plate via a separator, the first and second electrode plate extending from the first and second electrode plate, the electrode assembly, and one side A pouch case which is opened to accommodate the electrode assembly and a metal material which is bonded and sealed to an opening of the pouch case and has at least one through hole and at least one electrode pin fastened to the through hole. At least one of the first and second terminal portions of the assembly is a pouch cover bonded to be electrically connected to the electrode pins, and is exposed to the outside of the pouch cover, and a first electrically connected to the first and second terminal portions. And it provides a pouch-type secondary battery comprising a second lead portion.
    [26] According to another feature of the invention, the electrode pin is formed to be insulated from the pouch cover, the first terminal portion is electrically connected to the inner surface of the pouch cover, the second terminal portion is electrically connected to the inner surface of the electrode pin, respectively In this case, the first lead portion may be bonded to the outer surface of the pouch cover, and the second lead portion may be bonded to the outer surface of the electrode pin so as to be insulated from the pouch cover.
    [27] According to another feature of the invention, the electrode pin is provided with first and second electrode pins respectively formed at positions corresponding to the first and second terminal portion, at least one of the first and second electrode pins It may be formed to be insulated from the pouch cover, and the first and second terminal portions may be joined to be electrically connected to inner surfaces of the first and second electrode pins, respectively. In this case, the first and second lead portions may be bonded to outer surfaces of the first and second electrode pins, respectively, and at least one of the first and second lead portions may be insulated from the pouch cover.
    [28] According to another feature of the invention, the metal material forming the pouch cover may be a steel with a plating layer formed on the surface, or may be stainless steel.
    [29] In order to achieve the above object, the present invention also provides an electrode assembly comprising a first electrode plate and a second electrode plate via a separator, wherein first and second terminal portions extend from the first and second electrode plates; And a pouch case in which one surface is opened to accommodate the electrode assembly, and an insulating reinforcement thin plate to be bonded and sealed to an opening of the pouch case, the first and second portions being formed at positions corresponding to the first and second terminal portions, respectively. And a first and second electrode pin fastened to a second through hole and the first and second through holes, respectively, so that the first and second terminal portions of the electrode assembly are provided on inner surfaces of the first and second electrode pins. And a pouch cover joined to be electrically connected to each other, and first and second leads joined to be electrically connected to outer surfaces of the first and second electrode pins, respectively. It provides a pouch type secondary battery, characterized in that binary.
    [30] In the present invention, the reinforcing member may be coupled to at least one surface of the electrode assembly to be in close contact, wherein the reinforcing member may be a thin plate provided with an insulating material.
    [31] The reinforcing member may be a metal sheet covered with an insulating resin material, and may be provided with a fiber reinforced resin material, an insulating polymer, or an insulating tape.
    [32] In addition, according to another feature of the present invention, the insertion hole is inserted into the side of the electrode assembly extending the first and second terminal portion is inserted so that the first and second terminal portions are respectively exposed to the outside. The formed insulating terminal cover may be installed.
    [33] In the present invention, the electrode assembly may be formed by laminating the first and second electrode plates via a separator, or may be formed by winding the first and second electrode plates through a separator.
    [34] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
    [35] Figure 4 is an exploded perspective view showing a pouch type secondary battery according to an embodiment of the present invention, Figure 5 is a view showing a state in which the pouch type secondary battery is coupled.
    [36] Referring to the figure, the pouch type secondary battery according to the preferred embodiment of the present invention is the electrode assembly 50, the first electrode plate and the second electrode plate is provided via a separator, and the pouch case in which the electrode assembly ( 42 and a pouch cover 44 joined and sealed to the flange portion 42a constituting the opening of the pouch case 42. In the figure, the electrode assembly 50 is provided with an electrode jelly roll in which the first electrode plate and the second electrode plate are wound through the separator. However, the electrode assembly 50 is not limited thereto, and the first electrode plate and the second electrode plate are interposed between the separators. It may be provided as a stacked electrode assembly stacked. This is equally applicable to all embodiments of the present invention to be described below. Meanwhile, in the electrode assembly 50, when the first electrode plate is a positive electrode plate, when the second electrode plate is a negative electrode plate, when the first electrode plate is a negative electrode plate, the second electrode plate may be a positive electrode plate, the positive electrode plate and the negative electrode plate is a metal thin plate And a positive electrode current collector and a negative electrode current collector, and a positive electrode and negative electrode active material layer coated on at least one surface of the positive electrode and negative electrode current collector. In a lithium secondary battery, an aluminum thin plate is usually used as the positive electrode current collector, and a copper thin plate is used as the negative electrode current collector. A mixture containing a cathode active material such as a lithium oxide is used as the cathode active material layer, and a mixture containing a cathode active material such as a carbon material is used as the anode active material layer. The first terminal part 51a and the second terminal part 51b extend from the first electrode plate and the second electrode plate of the electrode assembly 50, respectively.
    [37] The electrode assembly 50 as described above is accommodated in a pouch case 42 having one surface thereof open and a flange portion 42a formed for joining a cover around the opening, and the flange portion 42a of the pouch case 42. ) Is joined to and sealed by pouch cover 44. In one preferred embodiment of the present invention, at least the pouch cover 44 of the pouch case 42 and the pouch cover 44 may be provided with a metal material, in particular, strength that is a weak point in the pouch type secondary battery It is preferable to form a steel (steel) material to reinforce, more preferably may be formed of steel or stainless steel with a plating layer formed on the surface. Of course, this is not limited to the silk pouch cover 44, the pouch case 42 may also be formed of a steel material, in particular steel or stainless steel with a plating layer formed on the surface for compensation of strength. This is of course also equally applicable to all embodiments of the invention described below. When the pouch cover 44 and the pouch case 42 are formed of different materials, the pouch cover 44 is formed of reinforcing steel or the like, and the pouch case 42 is made of a conventional aluminum thin plate and resin material. It can be formed as.
    [38] As shown in FIG. 7, the pouch case 42 and the pouch cover 44 may be provided in a structure separated from each other. Alternatively, the pouch case 42 and the pouch cover 44 may be provided in a structure formed integrally with each other. That is, when the pouch case 42 and the pouch cover 44 are both made of a reinforcing metal material such as steel, the pouch case 42 and the pouch cover 44 may be integrally formed. When the material of the pouch case 42 and the pouch cover 44 are different, that is, only the pouch cover 44 is reinforced. In the case of forming the metal for the material it can be formed in a separate structure.
    [39] The first and second terminal portions 51a and 51b of the electrode assembly 50 are coupled to the pouch cover 44 as described above. At this time, the first terminal portion 51a is bonded to the inner surface of the pouch cover 44 made of a metal material, and the second terminal portion 51b is formed in the electrode pin 46 formed through the pouch cover 44. Is bonded to the side. This will be described in more detail as follows.
    [40] 6A and 6B show an electrode pin 46 fastened to a pouch cover 44 provided with a reinforcing metal material. The pouch cover 44 penetrates the cover 44 as shown in FIG. 6A. A through hole 45 is formed so that the electrode pin 46 is fastened to the through hole 45. The electrode pin 46 is fastened to be insulated from the pouch cover 44 to electrically connect the electrode terminal portion to be bonded at the inner side of the pouch cover and the electrode terminal portion to be bonded at the outer side of the pouch cover. According to the embodiment, as can be seen in Figure 6b, the conductive portion 47 and the conductive portion 47 provided with a conductive metal material is provided with an insulating portion 48 to insulate the pouch case 44. The energization part 47 is provided in a two-stage cylindrical shape made of metal such as aluminum, copper, iron, etc., and a portion 46b having a small diameter is inserted into the through hole 45 of the pouch tees 44 to have a large diameter ( 46A), the insulating portion 48 is formed of an insulating material at a portion to be brought into contact with the through hole 45 and the peripheral portion of the through hole 45. The insulating part 48 may be heat-compression-compressed after being inserted into the through-hole 45 of the pouch case 44 using a modified polypropylene such as CPP (Casted Polypropylene) capable of heat sealing. The electrode pin 46 thus formed is fastened to a position corresponding to the terminal portion to be joined to the electrode pin 46.
    [41] The electrode assembly 50 is coupled to the inner surface of the pouch cover 44 to which the electrode pins 46 are bonded as shown in FIG. 7, and the first terminal portion 51a of the electrode assembly 50 is the pouch cover 44. On the inner side of the), the second terminal portion 51b is bonded to each other so as to be electrically connected to the electrode pins 46 of the pouch cover 44. The first and second terminal portions 51a and 51b may be joined by welding, and the first terminal portion 51a joined to the inner surface of the pouch cover 44 may be formed by resistance welding. The second terminal portion 51b joined to the pin 46 may be made by ultrasonic welding.
    [42] On the other hand, the second terminal portion 51b to be welded to the inner surface of the electrode pin 46 is welded to the conductive portion 47 of the electrode pin 46 as shown in Figure 8a, the conductive portion 47 is insulated It is insulated from the pouch cover 44 via 46. After such welding, as shown in FIG. 8B, the protection portion 49 is formed to cover the portion of the welded second terminal portion 51b. The protective part 49 can be formed by applying a polymer insulating material, and can be formed by attaching an insulating tape. In order to prevent the second terminal portion 51b from coming into contact with the pouch cover 44 made of metal and causing a short circuit, an insulating tape 53 may be further attached to the second terminal portion 51b.
    [43] In this way, the electrode assembly 50 coupled to the pouch cover 44 is housed in the pouch case 42 together with the pouch cover 44 and sealed as shown in FIG. 4. The pouch case 42 and the pouch cover 44 are joined to each other at the flange portion 42a of the pouch case 42 and the junction portion 44a of the pouch cover 44. The flange portion 42a and the junction portion 44a are connected to each other. ) Can be welded to each other or joined via a high melting point adhesive. At this time, the joint is bonded to the remaining portion except for the front portion 42b of the flange portion 42a and the front portion 44b of the bonding portion 44a to inject the electrolyte solution, and then the front portion 42b. The electrolyte injection nozzle is inserted into these gaps with the electrolyte 44b facing up to inject the electrolyte solution. After injecting the electrolyte, it is stored in the vacuum chamber for a certain time so that the electrolyte can be sufficiently impregnated into the electrode plate. When the electrolyte is injected in this way, a concave electrolyte injection hole may be separately formed in the front portions 42b and 44b of the flange portion 42a or the joint portion 44a to allow the electrolyte to be injected therethrough.
    [44] After injecting the electrolyte, the front parts 42b and 44b are joined by welding or high temperature adhesive, and as shown in FIG. 5, the first and second leads exposed to the outside of the pouch cover 44. The electrode lead portions 52 of the portions 52a and 52b are joined. The first and second lead portions 52a and 52b are electrically connected to the first and second terminal portions 51a and 51b of FIG. 4, and according to a preferred embodiment of the present invention, the first The lead portion 52a is bonded to the outer surface of the pouch cover 44, and the second lead portion 52b is bonded to the outer surface of the electrode pin 46 fastened to the pouch cover 44. Accordingly, the first lead part 52a is electrically connected to the first terminal part 51a joined to the pouch cover 44 made of a reinforcing metal material through the pouch cover 44 and the second lead part 52b is electrically connected to the second terminal portion 51b bonded to the electrode pin 46 through the electrode pin 46. That is, when the first terminal portion 51a represents the positive electrode, the pouch cover 44 to which the first terminal portion 51a is bonded represents the positive electrode, so that the first lead portion 52a also represents the positive electrode, and the second terminal portion When 51b indicates a negative electrode, the second terminal portion 52b connected through the electrode pin 46 also shows a negative electrode. Of course, the opposite is also true.
    [45] In the above structure, the second lead portion 52b needs to be insulated from the pouch cover 44. According to a preferred embodiment of the present invention for this insulation, as shown in Figure 5, the insulating tape 54 can be attached to the second lead portion 52b, although not shown, the second lead portion An insulating tape may be attached to the part of the pouch cover that comes in contact with the.
    [46] After all the assembly process is completed, the bonded portion of the pouch cover 44 and the pouch case 42 can be folded and used in the outer case.
    [47] According to a preferred embodiment of the present invention as described above, after the pouch cover is provided with a reinforcing metal material, the pouch cover is used as one of the anode and the cathode, and the other pole is formed through the pouch cover. It is drawn out through the electrode pin. According to another preferred embodiment of the present invention as shown in FIG. 9 and FIG. 10, the pouch-type battery includes an electrode lead portion outside the cover by electrode pins in both the first terminal portion 51a and the second terminal portion 51b. It can also be connected to
    [48] That is, as shown in FIG. 9, the pouch cover 64 made of a reinforcing metal material may include the first electrode pin 66a and the first electrode pin 66a and the second terminal portion 51a formed at positions corresponding to the first and second terminal portions 51a and 51b, respectively. It is provided with the 2 electrode pin 66b, and the 1st terminal part 51a and the 2nd terminal part 51b are joined to this 1st and 2nd electrode pin 66a, 66b, respectively. A protective portion 69 is formed on the outer surfaces of the joined first and second terminal portions 51a and 51b by an insulating polymer, an insulating tape, or the like, and although not illustrated, the first and second terminal portions 51a are not shown. An insulating tape may be further attached to 51b to insulate the metal pouch cover 64. At this time, the protection part 69 may be formed only in one terminal part of the joined 1st terminal part 51a or the 2nd terminal part 51b. This is because if the pouch cover 64 is insulated from only one electrode, a short circuit of the battery can be prevented. In addition, the structure of the first and second electrode pins 66a and 66b, the connected form thereof, and the like are the same as those of the electrode pin in the above-described embodiment.
    [49] The pouch cover 64 thus formed is sealed with the pouch case 62 as described above, and the first and second lead portions 52a and 52b are attached to the outside of the pouch cover 64 as shown in FIG. 10. . At this time, the first lead portion 52a is joined to the first electrode pin 66a, and the second lead portion 52b is joined to the second electrode pin 66b, respectively, and the first and second lead portions 52a are attached. An insulating tape 54 is attached to 52b. Of course, the insulating tape 54 may be attached to the portion of the pouch cover 64 that contacts the first and second lead portions 52a and 52b. At this time, as described above, the insulating tape 54 is attached to only one electrode lead portion of the first lead portion 52a and the second lead portion 52b so that only one electrode lead portion is attached to the pouch cover. It can be insulated. Of course, the electrode lead portion to be insulated at this time corresponds to the electrode lead portion insulated from the corresponding electrode terminal portion with the pouch cover.
    [50] The pouch type secondary battery of FIGS. 9 and 10 may be applied to a pouch type secondary battery having a pouch cover provided with an insulating reinforcement thin plate. That is, the pouch cover is formed of a thin metal plate covered with an insulating resin material, a thin plate made of a fiber reinforced resin material, or a thin plate provided with a hard insulating polymer. Of course, at this time, the pouch case 62 may be formed of a composite material of a metal and a resin material.
    [51] The pouch-type secondary battery in the case of forming a pouch cover with an insulating reinforcement thin plate, as shown in FIGS. 9 and 10, the first electrode pin 66a and the second electrode pin (fastened to penetrate the pouch cover 64). The first terminal portion 51a and the second terminal portion 52b of the electrode assembly 50 are respectively joined to 66b, and the pouch cover 64 is sealed with the pouch case 62. In this case, the first terminal part 51a and the second terminal part 51b do not have to be electrically connected to the pouch cover 64, so a separate protective part is not necessary, but may be formed.
    [52] The first and second lead portions 52a and 52b are bonded to the outside of the pouch cover 64 bonded to the pouch case 62, as shown in FIG. On the outer side of the electrode pin 66a, the second lead portion 52b is joined to the outer side of the second electrode pin 66b, respectively. In this case, a separate protective tape need not be attached to the first and second lead portions 52a and 52b, but may be formed.
    [53] The pouch type secondary battery as described above may increase the strength of the pouch cover to increase the safety of the battery against external shock.
    [54] On the other hand, in the pouch-type secondary battery as described above, a separate reinforcing member may be further provided on the electrode assembly coupled to the pouch cover and received in the pouch case. The reinforcing member provided in the electrode assembly will be described in more detail as follows.
    [55] 11A to 11C show an electrode assembly to be received and sealed by a pouch case and a pouch cover according to preferred embodiments of the present invention as described above, respectively.
    [56] First, referring to FIG. 11A, as described above, the electrode assembly 50 may be a wound electrode assembly 50 in which a first electrode plate and a second electrode plate are wound through a separator. On one side of the wound electrode assembly 50, first and second terminal parts 51a and 51b extend from each electrode plate.
    [57] In addition, as shown in FIG. 11B, the electrode assembly may be a stacked electrode assembly in which a plurality of bi-cell stacks in which a first electrode plate and a second electrode plate are laminated through a separator are stacked. On one side of the stacked electrode assembly 50, electrode terminal portions 51a 'and 51b' extend from each electrode plate, and the electrode terminal portions 51a 'and 51b' are welded to each other having the same polarity. As such, the reinforcing member in close contact with the electrode assembly in the present invention may be applied to both the stacked electrode assembly and the wound electrode assembly.
    [58] As can be seen in Figure 11a, the electrode assembly 50 as described above is in close contact with the reinforcing member 55 on at least one surface. As shown in FIG. 11A, the reinforcing member 55 according to the exemplary embodiment of the present invention is formed in a plate shape and is in close contact with the upper and lower surfaces of the electrode assembly 50, and the insulating reinforcing thin plate 55a is provided. An adhesive resin layer 55b such as CPP is formed on the surface of the insulating thin plate 55a facing the electrode assembly 50. The adhesive resin layer 55b may be formed by laminating a film of adhesive resin on the insulating thin plate 55a, or may be coated by applying an adhesive resin material. In addition, the adhesive resin layer 55b may be formed not only on the surface facing the electrode assembly 50 of the insulating thin plate 55a but also on other surfaces. In addition to the reinforcing member 55 may be made of a fiber-reinforced resin material or an insulating polymer. In addition, the reinforcing member 55 may be formed of an insulating tape and bonded to at least one surface of the electrode assembly 50.
    [59] The reinforcing member 55 may be in close contact with the electrode assembly 50 in various ways. The reinforcing member 55 may be tightly fixed by thermocompression, as shown in FIGS. 11A and 11B, and the insulating tape 56 as shown in FIG. 11C. Can be fixed tightly. At this time, when fixing by thermocompression as shown in Figure 11a and 11b is used when using a reinforcing member covered with an adhesive resin material on at least one surface of the insulating thin plate, or when using a reinforcing member made of fiber reinforced resin material. In the case of using a reinforcing member made of a fiber-reinforced resin material, the inner surface can be thermocompressed after the adhesive resin material is covered.
    [60] Such reinforcing members may also be formed on both side portions of the electrode assembly 50, as shown in FIGS. 12A and 12B, that is, as shown in FIG. 5A, the bottom and both sides and the back of the electrode assembly 50. The lower reinforcing member 58 and the upper reinforcing member 57 formed to be in close contact with the upper surface of the electrode assembly 50 may be thermocompression-bonded to the electrode assembly 50, or may be fixed by surrounding the insulating tape to the outside. 5B, the upper reinforcing member 57 ′ formed to be in close contact with both the top and both sides of the electrode assembly 50, and the lower reinforcement member 58 formed to be in close contact with both the bottom and both sides and the rear of the electrode assembly 50. ') May be thermocompression-bonded to the electrode assembly 50 or secured with insulating tape.
    [61] Thus, when the reinforcing member is formed in close contact with the surface of the electrode assembly, when the electrode assembly in which the reinforcing member is in close contact with the pouch case is protected, the electrode assembly can be more effectively protected from external shock. When combined with a pouch cover made of metal as shown in the embodiments of FIGS. 5, 9, and 10, contact with the pouch cover may be blocked to prevent a short circuit. In addition, the phenomenon that the electrode assembly swells due to the swelling phenomenon caused by the initial charging and discharging of the battery is also limited by the reinforcing member adhered to the outer surface of the electrode assembly to mitigate the change in the outer dimensions. In particular, it becomes possible to prevent a short circuit at the end caused by swelling of the electrode assembly in question.
    [62] As can be seen in FIGS. 13A-13D, the electrode assembly 70 to prevent volume expansion of the electrode assembly and subsequent short-circuits at the end due to swelling phenomena which may be particularly problematic in such stacked electrode assemblies. It is possible to use a reinforcing structure in which insulating tape is adhered to the side surface of the panel. That is, as shown in FIG. 13A, both side portions of the electrode assembly 70 are adhered to the side insulating tape 75, or as shown in FIG. 13B, the rear portions of the opposite sides on which the electrode terminal portions 71a and 71b are formed are rearward. It is adhere | attached with the insulating tape 76. Although FIG. 13B illustrates a structure in which all of the side insulating tapes 75 are adhered to each other, the structure is not necessarily limited thereto, and only the rear insulating tapes 76 may be bonded.
    [63] This reinforcing structure for adhering the insulating tape to the side portion is particularly useful for stacked electrode assemblies, as can be seen in FIGS. 13A and 13B. That is, as described above with reference to FIG. 3, in the stacked electrode assembly, when the electrode assembly is inflated due to a swelling phenomenon, there is a high possibility that a short circuit between the positive electrode plate and the negative electrode plate occurs at the end thereof. If the insulating tape is adhered to the side surface, a short circuit at the end can be prevented. Of course, the adhesion of the insulating tape to the side parts and the rear part can be applied to the wound electrode assembly as well as the stacked electrode assembly.
    [64] Meanwhile, as shown in FIGS. 13C and 13D, the insulating terminal cover 77 may be coupled to the side of the electrode terminal portions 71a and 71b formed therein. The insulating terminal cover 77 is formed with an insertion hole 78 into which the electrode terminal portions 71a and 71b are inserted. The insulating terminal cover 77 may be coupled to the front surface of the electrode assembly by a separate insulating tape 79. As shown in FIG. 13D, the terminal cover 77 may protect the electrode terminal portion 71 that is bent inside the terminal cover 77. Therefore, the terminal cover 77 not only insulates but also functions as a reinforcing material. The terminal cover 77 may be applied to all electrode assemblies having a reinforcing member according to the present invention described above.
    [65] According to the present invention as described above, the following effects can be obtained.
    [66] First, the reliability of the battery can be improved by improving the safety of the pouch type secondary battery against external shocks.
    [67] Second, it is possible to suppress the volume expansion due to the swelling phenomenon of the electrode assembly, thereby mitigating the change in the outer dimensions, and to prevent a short circuit at the end of the electrode assembly.
    [68] Third, the reinforcement effect of the battery can be increased by a simple configuration, thereby improving productivity.
    [69] Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.
    权利要求:
    Claims (17)
    [1" claim-type="Currently amended] An electrode assembly having a first electrode plate and a second electrode plate interposed between the separators, the first and second electrode plates extending from the first and second electrode plates;
    A pouch case having one surface opened to accommodate the electrode assembly;
    It is provided with a metal material to be bonded and sealed in the opening of the pouch case, and provided with at least one or more through-hole and at least one electrode pin fastened to the through-hole, at least one of the first and second terminal portion of the electrode assembly A pouch cover bonded to the electrode pins; And
    A pouch type secondary battery comprising a; exposed to the outside of the pouch cover, the first and second lead portions electrically connected to the first and second terminal portions.
    [2" claim-type="Currently amended] The method of claim 1,
    The electrode pins are formed to be insulated from the pouch cover, wherein the first terminal portion is bonded to the inner surface of the pouch cover and the second terminal portion is electrically connected to the inner surface of the electrode pin, respectively. Type secondary battery.
    [3" claim-type="Currently amended] The method of claim 2,
    The first lead part is bonded to the outer surface of the pouch cover, and the second lead part is bonded to the outer surface of the electrode pin so as to be insulated from the pouch cover.
    [4" claim-type="Currently amended] The method of claim 1,
    The electrode pins may include first and second electrode pins formed at positions corresponding to the first and second terminal units, respectively, and at least one of the first and second electrode pins may be insulated from the pouch cover. The pouch type secondary battery of claim 1, wherein the first and second terminal parts are electrically connected to inner surfaces of the first and second electrode pins, respectively.
    [5" claim-type="Currently amended] The method of claim 4, wherein
    The first and second lead portions are respectively bonded to outer surfaces of the first and second electrode pins, and at least one of the first and second lead portions is insulated from the pouch cover. battery.
    [6" claim-type="Currently amended] The method according to any one of claims 1 to 5,
    The metal material is a pouch type secondary battery, characterized in that the plated layer formed of steel.
    [7" claim-type="Currently amended] The method according to any one of claims 1 to 5,
    The metal material is a pouch type secondary battery, characterized in that the stainless steel.
    [8" claim-type="Currently amended] An electrode assembly having a first electrode plate and a second electrode plate interposed between the separators, the first and second electrode plates extending from the first and second electrode plates;
    A pouch case having one surface opened to accommodate the electrode assembly;
    It is provided with an insulating reinforcing thin plate to be bonded and sealed to the opening of the pouch case, and fastened to the first and second through holes and the first and second through holes respectively formed at positions corresponding to the first and second terminal portions, respectively. A pouch cover having first and second electrode pins coupled to each other so that the first and second terminal portions of the electrode assembly are electrically connected to inner surfaces of the first and second electrode pins, respectively; And
    And a first lead portion and a second lead portion bonded to the outer surfaces of the first and second electrode pins, respectively.
    [9" claim-type="Currently amended] The method according to any one of claims 1 to 5 and 8,
    Pouch-type secondary battery, characterized in that the reinforcing member is coupled to at least one surface of the electrode assembly in close contact.
    [10" claim-type="Currently amended] The method of claim 9,
    The reinforcing member is a pouch type secondary battery, characterized in that the thin plate provided with an insulating material.
    [11" claim-type="Currently amended] The method of claim 10,
    The reinforcing member is a pouch type secondary battery, characterized in that the metal sheet covered with an insulating resin material.
    [12" claim-type="Currently amended] The method of claim 10,
    The reinforcing member is a pouch type secondary battery, characterized in that provided with a fiber reinforced resin material.
    [13" claim-type="Currently amended] The method of claim 10,
    The reinforcing member is a pouch type secondary battery, characterized in that provided with an insulating polymer.
    [14" claim-type="Currently amended] The method of claim 10,
    The reinforcing member is a pouch type secondary battery, characterized in that provided with an insulating tape.
    [15" claim-type="Currently amended] The method according to any one of claims 1 to 5 and 8,
    A pouch type secondary, characterized in that an insulating terminal cover having an insertion hole is provided on the side surface of the electrode assembly extending from the first and second terminal portions so that the first and second terminal portions are respectively inserted and exposed to the outside. battery.
    [16" claim-type="Currently amended] The method according to any one of claims 1 to 5, 8 and 10 to 14,
    The electrode assembly is a pouch type secondary battery, characterized in that the first and second electrode plate is formed by being laminated through a separator.
    [17" claim-type="Currently amended] The method according to any one of claims 1 to 5, 8 and 10 to 14,
    The electrode assembly is a pouch type secondary battery, characterized in that the first and second electrode plate is formed by winding through a separator.
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    同族专利:
    公开号 | 公开日
    US20040033416A1|2004-02-19|
    US7410723B2|2008-08-12|
    KR100858799B1|2008-09-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-06-29|Application filed by 삼성에스디아이 주식회사
    2002-06-29|Priority to KR1020020037514A
    2004-01-13|Publication of KR20040003153A
    2008-09-17|Application granted
    2008-09-17|Publication of KR100858799B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020020037514A|KR100858799B1|2002-06-29|2002-06-29|Pouch type secondary battery|
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