• 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 invention relates to a rechargeable electric battery (1), in particular a high voltage battery, preferably for an electric vehicle, comprising at least one stack (3, 4) of battery cells (5) lined up in the stacking direction (y), at least two cell poles (18) of adjacent battery cells (5) - are preferably electrically interconnected by at least one cell connector (19, 20). In order to enable a simple production, it is provided that the connection between at least one cell pole (18) and at least one cell connector (19, 20) and / or between at least one cell pole (18) and at least one bus bar and / or directly between two cell poles (18) is formed by a cold-pressed-through clinching connection (21).
    公开号:AT511667A1
    申请号:T956/2011
    申请日:2011-06-30
    公开日:2013-01-15
    发明作者:Martin Dipl Ing Fh Michelitsch
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    1 * · * * * * • 562Ö4
    The invention relates to a rechargeable electric battery, in particular high-voltage battery, preferably for an electric vehicle, with at least one stack of juxtaposed battery cells, wherein at least two cell poles of adjacent battery cells - preferably electrically connected by at least one cell connector.
    High-voltage batteries usually have battery packs lined up with battery cells, for example, lithium-ion battery cells, wherein the cell poles are electrically connected to each other by cell connectors, which are connected to the cell poles by a laser welding connection. Due to the electrochemical material properties, the two cell poles of each battery cell usually consist of different materials, which makes connection technology more difficult. In the laser welding process which is very frequently used, the cell pole sheets protruding from the cell chemistry (usually Cu or Al) are welded together with an additional bi-metal cell connector (for example aluminum sheet or copper sheet via a compaction process). A direct welding of two different materials is technically extremely complicated and complicates the already complex to monitor and complex laser welding process.
    From DE 10 2009 035 463 Al a battery with a plurality of flat, substantially plate-shaped single battery cells is known. The battery cells are stacked into a cell stack and surrounded by a battery case. The battery single cells are formed in frame flat construction with metallic sheets and a frame made of insulating material.
    Also known from WO 2008/048751 A2 is a battery module with a multiplicity of plate-shaped battery cells arranged side by side in a stack, which are accommodated in a housing.
    WO 2010/053689 A2 describes a battery arrangement with a housing and a plurality of lithium-ion cells, which are arranged next to one another. The housing is flowed through for cooling with a thermally conductive, electrically insulating fluid.
    From WO 2010/067944 Al a battery with juxtaposed stack of battery cells is known, wherein battery cells are cooled by cooling air.
    DE 27 05 050 A1 describes a battery structure with at least one galvanic cell, which has a positive and a negative battery terminal and a positive and negative spiral wound into a cylindrical shape electrode material, wherein the connection between the electrode material with the poles via a mechanical point contact Connection takes place.
    From DE 10 2004 003 066 Al a prismatic accumulator with several cell vessels is known, wherein in each cell vessel, a plate stack is added. Contact connecting plates each extend along the intermediate walls of the cell vessel between the plate stacks, the contact connecting plates opposite an intermediate wall in each case being conductively connected to one another via the intermediate wall and the contacts of the plate stacks being electrically conductively connected by welding to the associated contact connector plates. The connection of contact connection plates through the intermediate wall is formed as a cold-pressed-through clinching connection.
    The object of the invention is to avoid the disadvantages mentioned, and to simplify the manufacture of a rechargeable electric battery of the type mentioned.
    According to the invention, this is achieved in that the connection between at least one cell pole and at least one cell connector and / or between at least one cell pole and at least one bus bar and / or directly between two cell poles is formed by a cold-press-through push-through connection, wherein preferably each push-through connection has several adjacent ones having arranged clinching points.
    The cell connectors may have a U- or Y-profile, wherein preferably U-profile and Y-profile cell connectors are alternately arranged between successive battery cells.
    The clinching connection is hermetically sealed, resulting in a long-term corrosion-resistant connection.
    In clinching, two or more sheets are plastically deformed by a tool punch and a tool die, creating a positive fit between the sheets. When connecting Zellbfechen these are connected depending on the selected Verschaltungsart (for example, two sheets in series connection or three or four sheets in a parallel connection of two battery cells with cell connectors and cell voltage monitoring cable) in one operation, which by using multiple tools simultaneously multiple joint points (Clinching points) on a Zellpolpaket (cell pile) or on several Zellpolpaketen can be set.
    The multiple joining points allow high current carrying capacity.
    The clinch connection allows easy contacting of the cell poles with different materials (eg, copper to aluminum or vice versa) without the need for additional components.
    Since the position of the clinch points may scatter much more than about the component positioning in a laser welding bond, resulting in a high tolerance compensation capability.
    By using parallel multiple tools a simple and inexpensive production can be made possible especially for large quantities, with only a few and easily controllable factors such as material wall thickness, pressing force or the like must be controlled.
    It is particularly advantageous if at least one clinching connection is arranged in a cooling air channel, wherein preferably the clinching connection has at least one clinching point projecting into the cooling air flow of the cooling air channel. The outstanding clinch points increase the surface area that is decisive for cooling, for example in the case of direct air cooling of the cell poles. The protruding clinch points also act to increase turbulence, which has an advantageous effect on the transport of heat
    Air cooling effect. Efficient component usage can thus increase the volumetric energy density of the battery.
    The invention will be explained in more detail below with reference to FIG.
    1 shows a battery according to the invention in an oblique view from above, Fig. 2 shows the battery in a section along the line II - II in Fig. 1, Fig. 3 shows the battery in a front view, Fig. 4 shows the battery in an oblique view from underneath,
    5 a battery module of the battery in an oblique view, FIG. 6 this battery module in a view from below, FIG. 7 a stack of battery cells in an oblique view, FIG. 8 this stack in a side view, FIG. 9, the stacks of battery cells 10 shows a battery module in a section according to the line X - X in FIG. 9, and FIG. 11 shows a detail of this battery module in a section analogous to FIG. 10.
    The rechargeable battery 1 has in the exemplary embodiment seven battery modules 2, wherein each battery module 2 has two stacks 3, 4 of juxtaposed and strained battery cells 5. The stacks 3, 4 of each battery module 2 are sandwiched between two structurally stiff corrugated metal plates 6, e.g. Aluminum, or plastic, arranged, wherein the plates 6 may be formed by die castings. The plates 6 themselves are clamped between two holding plates 7, 8 at the front and back of the battery 1, wherein the holding plate 7 is fixedly connected at the front via clamping screws 9 with the holding plate 8 at the rear. The clamping screws 9 are each arranged in the region of the plates 6. The plates 6 together with the holding plates 7, 8 form a holding frame 10 for the battery modules 2. The holding plates 7, 8 have openings in order to keep the weight as low as possible. The-seen in the stacking direction y - defined distance between the clamping screws 9 ensures that the battery cells are installed 5 in the correct position and with certain and over the life of the battery 1 is substantially invariable bias. Between the plates 6 and the adjacent battery cells 5 is in each case an elastic insulating layer 6a, for example of a foam, arranged, which allows a uniform and gentle pressure distribution.
    Down the battery 1 is completed by a bottom plate 11. * · 4 t 5
    The battery 1 together with the holding frame 10 is arranged in a housing 12, wherein between the housing 12 and the battery 1 Kiihlluftströmungswege are formed. For guiding the cooling air flow, flow guide surfaces 13 are incorporated into the housing bottom 12a, as can be seen in FIGS.
    Each battery cell 5 is surrounded by a plastic sheath 14, wherein the plastic sheath 14 approximately in the region of a Zellmittelebene 15 along the narrow side 5a has a protruding seal seam 16 for sealing. Between the sealing seams 16 of two adjacent battery cells 5 of a stack 3, 4 a free space 17 is spanned in each case.
    To save space, the two juxtaposed stack 3, 4 each battery module 2 are offset and formed overlapping each other. The offset V is approximately half the thickness D of a battery cell 5. The sealing seams 16 of a battery cell 5 of the one stack 3, 4 protrude into a space of sealing seams 16 of two adjacent battery cells 5 of the other stack 4, 3 open space 17 inside. As a result, the free space 17 can be used at least partially by accommodating part of the sealing seams 16. This has a very beneficial effect on the size of the installed space and on the volumetric energy density. The offset v between the two stacks 3, 4 causes the plates 6 form a step 24 in the region of a longitudinal center plane la of the battery 1.
    On the upper narrow side 5a protrude from the plastic sheaths 14 cell poles 18, which are connected to each other via U- and Y-shaped cell connectors 19, 20.
    The connection between the cell connectors 19, 20 and the cell poles 18 may be implemented as a clinching connection 21 comprising one or more clinching points 21a in a clinching process. This allows a particularly high current carrying capacity by means of juxtaposed Mehrfachfügepunkte and a corrosion-resistant long-term compound due to the hermetically sealed joints and easy contacting of the cell poles 18 with different materials (copper to aluminum and vice versa), without additional components. By means of clinching, two to four sheets can be electrically connected to one another with the same tool, with the materials copper, aluminum and steel being particularly suitable for wall thicknesses of 0.1 to 0.5 mm. Optionally, therefore, in one step simultaneously with the t j * · 6 *. k * «« * * * * i »4 * ·« «*» I * < * ******* · Μ M ♦ »*
    Cell connectors 19, 20 and cell voltage monitoring cable 22 are connected to the cell poles 18 in a clinching process. Since the position of the clinching points 21a of the clinching joint 21 is allowed to scatter more than, for example, a laser welding joint, a relatively high tolerance compensation capability results. By using parallel and multiple tools can be realized for larger quantities a simple and cost-effective production, with only a few and easily controllable influencing factors such as material wall thickness, pressing force, etc. are available. By projecting into the cooling air channel 27 clinching 21a, the heat-dissipating surface of the battery 1 is increased, which is particularly important in direct air cooling of the cell poles 18 of importance. The protruding clinch points 21a also contribute to the increase in turbulence, which improves the heat transport, in particular in the case of air cooling. As a result of their positive effect on the cooling, clinching points 21a also contribute to increasing the volumetric energy density through efficient use of space.
    In order to achieve a particularly good volumetric energy density, it is necessary to position the battery cells 5 as close to each other as possible. For this purpose, a thin, thermal and electrical insulator layer 23, for example an insulating film, is arranged between the battery cells 5 in order to prevent the occurrence of a "domino effect". to avoid thermal overload of an adjacent battery cell 5.
    The free spaces 17 at the same time form cooling air channels 26, 27. In the region of the overlap 25 of the two stacks 3, 4, that is to say in the region of the longitudinal center plane 1a of the battery 1, the free spaces 17 form first cooling air channels 26, which are arranged in the direction of the vertical axis z of the battery 1. The sealing seams 16 thereby form flow guide surfaces for the air flow and heat-dissipating surfaces. In the direction of a transverse axis x normal to the vertical axis z and normal to the stacking direction y second cooling air channels 27 are formed in the region of the cell poles 18 through the free spaces 17 at the top of the battery cells 5.
    The first and second cooling air channels 26, 27 are part of a closed cooling air circuit 28 for cooling the battery 1, wherein the cooling air circuit 28 has at least one cooling air blower 29 and at least one heat exchanger 30. The cooling air is - coming from the cooling air blower 29 and the heat exchanger 30 - in the housing 12 in the region of the holding plate 9 at the rear and / or top of the battery 1 or in the region of the cell poles 18 supplied. The cooling air flows through the second cooling air channels 27 and cools cell poles 18 and cell connectors 19, 20. Thereafter, at least a portion of the cooling air passes into the first cooling air channels 26, which lead the cooling air counter to the vertical axis z down. In this case, all spaces and clearances 17 of the battery 1 flows through and dissipates accumulating heat. Between the retaining plate 8 at the front of the battery 1 and the housing 12 and the remaining cooling air flows to the housing bottom 12a of the housing 12, where it is passed through the flow guide 13 to the vehicle longitudinal center plane ε and collected. Thereafter, the cooling air is sucked in again by the cooling air blower and cooled in the heat exchanger 30, before it is again supplied in the closed cooling circuit 28 of the battery 1.
    权利要求:
    Claims (11)
    [1]
    1. Rechargeable electric battery (1), in particular high-voltage battery, preferably for an electric vehicle, with at least one stack (3, 4) of lined-up battery cells (5), wherein at least two cell poles (18) of adjacent battery cells (5) - preferably by at least one cell connector (19, 20) - are electrically conductively connected to each other, characterized in that the connection between at least one cell pole (18) and the cell connector (19, 20) and / or between at least one Zellpol (18) and at least one bus bar and / or directly between two cell poles (18) by a cold-surface-compressed push-through connection (21) is formed.
    [2]
    2. Battery (1) according to claim 1, characterized in that each clinching connection (21) has a plurality of juxtaposed clinching points (21a).
    [3]
    3. Battery (1) according to claim 1 or 2, characterized in that the clinching connection (21) are hermetically sealed.
    [4]
    4. Battery (1) according to one of claims 1 to 3, characterized in that at least one cell poles (18) and at least one with the cell pole (18) by means of the clinching connection (21) connected cell connectors (19, 20) made of different metallic materials ,
    [5]
    5. Battery (1) according to one of claims 1 to 4, characterized in that at least one cell connector (19) has a U-profile.
    [6]
    6. Battery (1) according to any one of claims 1 to 5, characterized in that at least one cell connector (20) has a Y-profile, and preferably consists of two different metallic materials.
    [7]
    7. Battery (1) according to claim 5 or 6, characterized in that cell connectors (19, 20) are arranged with U-profile and Y-profile alternately between successive battery cells (5).
    [8]
    8. Battery (1) according to one of claims 1 to 7, characterized in that at least one clinching connection (21) in a cooling air channel (27) is arranged.
    [9]
    9. Battery (1) according to claim 8, characterized in that at least one clinching connection (21) has at least one in the cooling air flow of the cooling air channel (27) projecting clinching (21a).
    [10]
    10. Battery (1) according to claim 8 or 9, characterized in that at least one clinching point (21a) at least one clinching compound (21) is formed turbulence generating.
    [11]
    11. Battery (1) according to one of claims 1 to 10, characterized in that by means of the clinching connection (21) and at least one cell voltage monitoring cable (22) with at least one cell pole (18) is electrically connected.

    2011 06 30 Fu / St
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    法律状态:
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    优先权:
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    ATA956/2011A|AT511667B1|2011-06-30|2011-06-30|RECHARGEABLE ELECTRIC BATTERY|ATA956/2011A| AT511667B1|2011-06-30|2011-06-30|RECHARGEABLE ELECTRIC BATTERY|
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    DE201211002697| DE112012002697A5|2011-06-30|2012-06-26|Electrical storage device|
    JP2014517646A| JP2014524107A|2011-06-30|2012-06-26|Power storage device|
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    PCT/EP2012/062309| WO2013000889A1|2011-06-30|2012-06-26|Electric storage device|
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