• 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 housing (5) for the cooling system (1) of storage battery cells, comprising: - external walls (9, 11, 13) which delimit a sealed housing (7) for said cells, and which has an inlet opening (24) and an outlet opening (35) for coolant (22), - an inner wall (17) defining a circulation duct (21) for the coolant communicating with the opening input. According to the invention, the inner wall has a plurality of holes (23) which open into said housing.
    公开号:FR3079352A1
    申请号:FR1852533
    申请日:2018-03-23
    公开日:2019-09-27
    发明作者:Thierry Tourret
    申请人:Renault SAS；
    IPC主号:
    专利说明:

    Technical field to which the invention relates
    The present invention relates generally to the field of cooling of accumulator battery cells.
    It relates more particularly to a case for a system for cooling accumulator battery cells, comprising:
    - external walls which define a sealed housing for said cells, and which has an inlet opening and an outlet opening for heat transfer fluid, and
    - an internal wall defining a circulation conduit for the heat-transfer fluid, this circulation conduit communicating with the inlet opening.
    It also relates to a cooling system for accumulator battery cells, comprising:
    - a housing as mentioned above, and
    a cooling circuit which includes a pump and a heat exchanger and which is connected, upstream of the pump and of the heat exchanger, to the outlet opening of the housing, and, downstream of the pump and of the heat exchanger, at the inlet opening of the housing.
    It also relates to a battery pack of accumulators, comprising:
    - a cooling system as mentioned above, and
    - accumulator battery cells housed in the cooling system housing.
    TECHNOLOGICAL BACKGROUND
    Electrically powered motor vehicles, including hybrid thermal and electric powered vehicles, are generally equipped with an electric motor powered by a battery pack. Conventionally, such a battery pack accommodates a plurality of battery modules, which each incorporate a plurality of small size battery cells.
    The number of accumulator battery cells is calculated so that the electric motor can develop sufficient torque and power to propel the vehicle for a predetermined period of time.
    When the accumulator pack powers the electric motor or during the recharging of the accumulator pack, a significant part of the energy developed or received by the accumulator battery cells is released in the form of heat. It is then necessary to cool these storage battery cells so that their temperature never exceeds a threshold (which is of the order of 60 degrees Celsius) beyond which they would risk prematurely aging or even deteriorating irreversibly.
    For this purpose, document US8329325 discloses a system for cooling accumulator battery cells.
    In this document, the battery cells are misted using a fan. More specifically, the fan sends very fine droplets (we can speak of micro-droplets), of a heat transfer liquid on the battery modules. Part of the heat from the battery modules is then transferred to the microdroplets that flow along the battery modules. The microdroplets are then collected and the heat transfer fluid is cooled outside the housing before being returned to the housing.
    However, such a cooling system is not efficient enough and does not effectively regulate the temperature of the battery cells.
    Object of the invention
    In order to remedy the aforementioned drawback of the state of the art, the present invention provides a cooling system housing as defined in the introduction, in which the internal wall has a plurality of holes which open into said housing.
    Thus the heat transfer fluid is delivered to different areas of the battery cells, which ensures more homogeneous cooling of these cells.
    Furthermore, thanks to these holes, the heat transfer fluid can be delivered in the form of drops. The drops of heat transfer fluid formed according to the invention have a large specific surface which allows them to efficiently absorb the heat of the battery cells, that is to say quickly and in large quantities. This makes the heat exchange more efficient and the cells are better cooled.
    Other non-limiting and advantageous characteristics of the box according to the invention, taken individually or in any technically possible combination, are the following:
    - the holes have diameters such that the heat transfer fluid forms drops when it passes through the holes,
    - the diameter of the holes is between 1 mm and 3 mm.
    - At least two supports are provided for two battery modules which each house a plurality of accumulator battery cells, said supports being positioned so that the battery modules are spaced from each other by a space , and in which at least one of said holes opens in the axis of said space,
    the internal wall is flat and defines, with a first of the external walls, said circulation duct,
    the internal wall having a length and a width, the holes are distributed in the length and in the width of the internal wall,
    the internal wall and the first external wall are flat and parallel,
    - a second internal wall is provided which has at least one orifice and which defines, with a second of the external walls, a second circulation duct for the heat transfer fluid which communicates with the outlet opening,
    - The second internal wall and the second wall are flat and parallel.
    The invention also provides a cooling system for accumulator battery cells as defined in the introduction, comprising a housing as mentioned above.
    The invention also provides a storage battery pack as defined in the introduction, comprising a cooling system as mentioned above.
    Detailed description of an exemplary embodiment
    The description which follows with reference to the appended drawings, given by way of nonlimiting examples, will make it clear what the invention consists of and how it can be carried out.
    In the accompanying drawings:
    FIGS. 1, 2 and 4 show schematic sectional views of three embodiments of a storage battery pack according to the invention, and
    - Figure 3 a schematic perspective view of the package housing of Figure 2 and a battery module housed in this housing.
    As a preliminary, it will be noted that the identical or similar elements of the different embodiments of the invention shown in the different figures will, as far as possible, be referenced by the same reference signs and will not be described each time.
    In addition, the embodiments of the invention are described in a geocentric frame of reference. Thus, considering the invention in the position in which it will be implemented, the terms "higher" and "lower" are to be interpreted according to their current definitions in the geocentric frame of reference.
    In Figure 1, there is shown a first embodiment of a battery pack 53 intended to equip a motor vehicle with electric propulsion in order to supply electric current to the electric motor of this vehicle.
    This accumulator pack 53 here comprises battery modules 3 (housing each of the accumulator battery cells), and a cooling system 1 for these battery modules 3.
    The cooling system 1 is in particular designed to store the battery modules 3 and to ensure that they are kept at a temperature below a threshold. To this end, it includes a housing 5 and a cooling circuit 29.
    The housing 5 comprises external walls 9, 11, 13 which delimit a sealed housing 7 in which the battery modules are arranged 3. The housing 5 has an inlet opening 24 and an outlet opening 35 for the circulation of a heat transfer fluid 22.
    The housing 5 further comprises an internal wall 17 which delimits an inlet duct 21 for the heat transfer fluid 22, which inlet duct 21 communicates with the inlet opening 24.
    According to a particularly advantageous characteristic of the invention, the internal wall 17 has a plurality of holes 23 opening into the housing
    7. The plurality of holes 23 thus allows the circulation of the heat transfer fluid 22 from the inlet duct 21 to the housing 7.
    As shown in FIG. 1, the housing 5 more specifically comprises here six external walls, including an upper wall 9, a lower wall 11, and four side walls 13 joining the upper wall 9 to the lower wall 11. The housing 5 here represented thus has a shape of a rectangular parallelepiped.
    As shown in Figure 2, the outlet opening 35 is here located in one of the side walls 13, near its lower edge. The inlet opening 24 is here located in this same side wall 13, near its upper edge.
    One could foresee that the internal wall pierced with holes forms a sort of tube folded in a serpentine above the battery modules 13.
    However, here, and preferably, the internal wall 17 is flat and parallel to the upper external wall 9, so as to form therewith a double wall delimiting the inlet duct 21. It is therefore understood that this duct d Entrance 21 has the shape of a rectangular parallelepiped of small thickness.
    The holes 23 are then distributed in the length L and in the width I of the internal wall 17, so as to be able to uniformly sprinkle the battery modules 3 placed below it.
    The plurality of holes 23 here allows the flow of the heat transfer fluid 22 in the housing 7 in the form of drops. In fact, the holes 23 have shapes and dimensions adapted to form drops of heat transfer fluid 22.
    The holes are more precisely here circular shapes and diameters between 1 and 3 mm. The exact diameters of these holes 23 are determined as a function of physical properties of the heat transfer fluid 22 circulating in the inlet duct 21 so as to allow the formation of drops of heat transfer fluid
    22.
    The heat transfer fluid 22 is for example a fluid of the 3M Novec type.
    The lower wall 11 then serves as a receptacle for receiving the heat transfer fluid 22.
    The position of the outlet opening 35 then allows the heat transfer fluid 22 present on this bottom wall 11 to flow back towards the latter.
    The risk is then that, under the effect of the inertial forces which are exerted on it when the vehicle is moving, the heat transfer fluid 22 does not always flow back towards this outlet opening 35.
    In order to reduce this risk, as shown in FIGS. 2 and 3, provision can be made to place a second internal wall 27 in the bottom of the housing 7 of the housing 5.
    In this second embodiment, the second internal wall 27 has the shape of a rectangular flat plate which has at its center a single rectangular orifice 33. This second internal wall 27 extends parallel to the lower external wall 11 and delimits therewith a second circulation duct 31 for the heat transfer fluid 22, making it possible to prevent the fluid from going back up into the housing 7 when the vehicle is moving. .
    In all the embodiments, supports 5 are provided in the housing 5 to hold the battery modules 3 in a fixed position. As shown in Figure 3, each support 15 comprises for example, projecting from the inner face of two opposite side walls 13, two ribs 15A, 15B which extend vertically. These ribs allow not only to block the battery modules 3, but also to guide their sliding towards the bottom of the housing 7 during their installation in the housing 5 (before the upper wall 9 is attached to the rest of the housing to close hermetically the housing 5).
    The supports 15 are configured so that the battery modules 3 are spaced two by two by a space 49 visible in FIGS. 1 and
    2.
    Advantageously, the holes 23 are then aligned in the axis of these spaces 49, so that the drops of water fall on the main faces of the battery modules 3.
    The holes 23 are then more precisely distributed on parallel lines which extend above the spaces 49.
    The cooling circuit 29 is designed to set in motion and cool the heat transfer liquid 22.
    This cooling circuit 29 comprises an inlet pipe 39 opening into the inlet pipe 21 of the housing 5 through the inlet opening 24, and an outlet pipe 41 originating in the housing 7 (FIG.
    1) or in the second conduit 31 (FIG. 2) through the outlet opening 35.
    The cooling circuit 29 is provided with a pump 43. As illustrated, the pump 43 can be of the eccentric type, but it is possible to envisage using other types of pumps. The pump 43 circulates the heat transfer fluid 22 in the cooling system 1.
    The pump 43 allows the cooling system 1 to reach a flow rate in the inlet duct 21 of the order of 20 liters per minute. This flow rate is indeed well suited to the formation of drops when the heat transfer fluid passes through the holes 23.
    In the two embodiments shown in FIGS. 1 to 3, the pump is fixed to the housing 5, on the external face of the latter. More specifically, the base of the pump is formed in one piece with one of the side walls 13 of the housing 5.
    The cooling circuit 29 further comprises a heat exchanger 45 (visible in Figures 1 and 2). The heat exchanger 45 allows an exchange between the heat transfer fluid 22 and a cold source (typically outside air, or another liquid). Thus, during its passage through the cooling circuit 29, the heat transfer fluid 22 is cooled thanks to the heat exchanger 45.
    The operation of the cooling system 1 can now be described.
    When the pump 43 is started, the cool coolant 22 is discharged into the inlet duct 21. The coolant 22 then has an initial temperature much lower than the temperature of the battery cells 47. Under the effect of earth's gravity , the heat transfer fluid 22 flows into the housing 7 in the form of drops. The drops of heat transfer fluid 22 flow into the spaces 49, along the battery modules 3. The drops of heat transfer fluid 22 have a large specific surface which allows them to absorb the heat of the battery modules 3 well, that is to say that is to say quickly and in large quantities. Thanks to this transfer of heat to the drops of heat transfer fluid 22, the temperature of the battery modules 3 drops rapidly.
    The heated heat transfer fluid 22 then flows to the bottom wall 11.
    The pump 43 then sucks the heat transfer fluid 22 heated in the outlet pipe 41, through the outlet opening 35. Then the heat transfer fluid 22 heated enters the heat exchanger 45 which absorbs part of its heat.
    In FIG. 4, a third embodiment of the invention has been shown in which the side walls 13 are doubled in order to delimit a space acting as inlet pipe 39 and outlet pipe 41. In this embodiment, the pump 43 is placed in this space and the heat exchanger 45 is fixed to the housing 5.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Housing (5) for cooling system (1) of storage battery cells, comprising:
    - external walls (9, 11, 13) which define a sealed housing (7) for said cells, and which has an inlet opening (24) and an outlet opening (35) for heat transfer fluid (22), and
    - an internal wall (17) delimiting a circulation duct (21) for the heat transfer fluid (22) which communicates with the inlet opening (24), characterized in that the internal wall (17) has a plurality of holes (23) which open into said housing (7).
    [2" id="c-fr-0002]
    2. Housing (5) according to the preceding claim, in which the holes (23) have diameters such that the heat transfer fluid (22) forms drops when it passes through the holes (23), this diameter being between 1 mm and 3 mm.
    [3" id="c-fr-0003]
    3. Housing (5) according to one of the preceding claims, in which at least two supports (15) are provided for two battery modules (3) which each house a plurality of accumulator battery cells, said supports ( 15) being positioned so that the battery modules (3) are spaced from each other by a space (49), and in which at least one of said holes (23) open in the axis of said space (49).
    [4" id="c-fr-0004]
    4. Housing (5) according to one of the preceding claims, in which the internal wall (17) is flat and delimits with a first of the external walls (9, 11, 13) said circulation duct (21), and in which , the internal wall (17) having a length (L) and a width (I), the holes (23) are distributed in the length (L) and in the width (I) of the internal wall (17).
    [5" id="c-fr-0005]
    5. Housing (5) according to the preceding claim, wherein the inner wall (17) and the first outer wall (9) are flat and parallel.
    [6" id="c-fr-0006]
    6. Housing (5) according to one of the preceding claims, wherein there is provided a second internal wall (27) which has at least one orifice (33) and which defines with a second external walls (11) a second conduit (31) circulation for the heat transfer fluid (22) which communicates with the outlet opening (35).
    [7" id="c-fr-0007]
    7. Housing (5) according to the preceding claim, wherein the second inner wall (27) and the second outer wall (11) are flat and parallel.
    [8" id="c-fr-0008]
    8. Cooling system (1) for storage battery cells, comprising:
    - a housing (5) according to one of the preceding claims, and
    - a cooling circuit (29) which includes a pump (43) and a
    5 heat exchanger (45) and which is connected, upstream of the pump (43) and of the heat exchanger (45), to the outlet opening (35) of the housing (5), and, downstream of the pump (43) and the heat exchanger (45), at the inlet opening (24) of the housing (5).
    [9" id="c-fr-0009]
    9. Accumulator battery pack (53), comprising:
    [10" id="c-fr-0010]
    10 - a cooling system (1) according to the preceding claim, and
    - accumulator battery cells housed in the housing (5) of the cooling system (1).
    类似技术:
    公开号 | 公开日 | 专利标题
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    FR3084810A1|2020-02-07|ELEMENT FOR THERMAL REGULATION OF AN ELECTRICAL COMPONENT, OF A MOTOR VEHICLE, CAPABLE OF GENERATING HEAT DURING OPERATION
    WO2019150051A1|2019-08-08|Ventilation device for a motor vehicle
    EP3925018A1|2021-12-22|Battery unit and motor vehicle provided with at least one such unit
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    同族专利:
    公开号 | 公开日
    FR3079352B1|2021-01-22|
    EP3544107A1|2019-09-25|
    EP3544107B1|2020-12-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CH703973A1|2010-10-29|2012-04-30|Obrist Engineering Gmbh|Temperature-controlled battery.|
    EP2506336A1|2011-03-30|2012-10-03|Tesla Motors, Inc.|Battery pack gas exhaust system|
    EP2790263A1|2012-02-07|2014-10-15|Lg Chem, Ltd.|Novel air cooled structured battery pack|
    EP3032607A1|2013-08-07|2016-06-15|Hitachi, Ltd.|Battery module|
    FR3104824A1|2019-12-13|2021-06-18|Renault S.A.S|Battery pack with cooling circuit|
    FR3105715A1|2019-12-20|2021-06-25|Valeo Systemes Thermiques|Thermal regulation device|
    FR3105711B1|2019-12-20|2022-01-14|Valeo Systemes Thermiques|THERMAL REGULATION DEVICE FOR AN ELECTRICAL AND/OR ELECTRONIC COMPONENT|
    FR3105717B1|2019-12-20|2022-01-14|Valeo Systemes Thermiques|Thermal control device for an electrical component|
    FR3105709A1|2019-12-20|2021-06-25|Valeo Systemes Thermiques|Thermal regulation device|
    FR3108464A1|2020-03-20|2021-09-24|Valeo Systemes Thermiques|Thermal regulation device|
    法律状态:
    2019-03-22| PLFP| Fee payment|Year of fee payment: 2 |
    2019-09-27| PLSC| Search report ready|Effective date: 20190927 |
    2020-03-19| PLFP| Fee payment|Year of fee payment: 3 |
    2021-03-23| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1852533|2018-03-23|
    FR1852533A|FR3079352B1|2018-03-23|2018-03-23|ACCUMULATOR BATTERY CELL COOLING SYSTEM BOX|FR1852533A| FR3079352B1|2018-03-23|2018-03-23|ACCUMULATOR BATTERY CELL COOLING SYSTEM BOX|
    EP19164603.3A| EP3544107B1|2018-03-23|2019-03-22|Housing for cooling system for storage battery cells|
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