Battery module, battery pack, and vehicle

Abstract

Embodiments of the present disclosure provide a battery module, a battery pack, and a vehicle. The battery module comprises a battery cell group, a liquid cooling assembly, and a heating film assembly. The battery cell group comprises a plurality of battery cells; the plurality of battery cells are arranged in an array in a battery case; the liquid cooling assembly comprises liquid cooling plates and busbars; the liquid cooling plates are connected to the busbars and poles of the battery cells; at least part of the heating film assembly is arranged on at least one of the side walls of the battery cells and the bottom walls of the battery cells; the liquid cooling plates are arranged at the upper parts of the battery cells; and the heating film assembly is arranged at the lower parts of the battery cells. According to the battery module of the present disclosure, the battery cells are heated at the same time by means of the liquid cooling plates and a heating module, thereby solving the technical problem in the prior art of slow heating rate of the battery cells under low-temperature working conditions.

Description

Battery module, battery pack and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410058601.1 and application date January 15, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular to a battery module, a battery pack and a vehicle. Background Art

[0004] As the core energy supply component of electric vehicles, the battery module's good working condition is the foundation for its normal operation. One of the key conditions for normal battery module operation is that the internal temperature of the battery module must remain within a certain temperature range. Excessively high or low internal temperatures will affect the battery module's charge and discharge capacity, reliability, and lifespan.

[0005] In related technologies, a liquid cooling plate is mainly set on the battery cell, and the heat dissipation or heating of the battery cell is achieved by adjusting the liquid cooling plate. However, the liquid cooling plate of this solution can only partially heat the battery cell, and the heating rate will be relatively slow under low temperature conditions, thereby affecting the performance of the battery module. Summary of the Invention

[0006] In order to solve the above technical problems, the embodiments of the present disclosure provide a battery module assembly, a battery pack and a vehicle.

[0007] In a first aspect, an embodiment of the present disclosure provides a battery module comprising:

[0008] A battery cell group, the battery cell group comprising a plurality of battery cells, wherein the plurality of battery cell arrays are arranged in a battery box;

[0009] A liquid cooling assembly, comprising a liquid cooling plate and a bus bar, wherein the liquid cooling plate is connected to the bus bar and the poles of the battery cell;

[0010] a heating film assembly, at least part of which is disposed on at least one of the side wall of the battery cell and the bottom wall of the battery cell;

[0011] The liquid cooling plate is arranged on the upper part of the battery core, and the heating film assembly is arranged on the lower part of the battery core.

[0012] In some embodiments, the heating film assembly includes a first heating film, which is arranged on the bottom wall of the battery cell group, and the first heating film includes a first side film and a first middle film. The first heating film includes a first side film and a first middle film, and the first side film is arranged on one side of the first middle film along a first direction. The first side film and the first middle film both extend along a second direction. The first direction, the second direction and the upper and lower directions of the battery cells are orthogonal to each other. The battery cell adjacent to the side wall of the battery box corresponds to the first side film, and the battery cell away from the side wall of the battery box corresponds to the first middle film. The power density of the first side film is greater than the power density of the first middle film.

[0013] In some embodiments, the heating film assembly further includes a second heating film and a third heating film, wherein the second heating film is disposed on a side of the battery cell group adjacent to the side wall of the battery box, and the third heating film is disposed between the walls of adjacent battery cells.

[0014] In some embodiments, the battery cell group has multiple battery cells along the first direction and the second direction, and there are multiple second heating films, and the multiple second heating films are arranged on the wall surface of the battery cell group along any one of the first direction and the second direction; and / or, there are multiple third heating films, and the multiple third heating films are arranged at intervals between the walls of adjacent battery cells along one of the first direction and the second direction, and the third heating film extends along the other of the first direction and the second direction.

[0015] In some embodiments, the power density of the first edge film is ≥A*the power density of the first middle film, 1<A≤2; and / or the power density of the second heating film is ≥A*(the power density of the third heating film / 2), 1<A≤2.

[0016] In some embodiments, at least one of the first side film, the first middle film, the second heating film and the third heating film includes a wiring segment and a middle segment, the wiring segment is arranged on one side of the length direction of the middle segment, and the power density of the wiring segment is ≥A*the power density of the middle segment, 1<A≤2.

[0017] In some embodiments, A=1.1.

[0018] In some embodiments, the battery module further includes a thermal insulation pad disposed between the first heating film and the bottom of the battery box.

[0019] In some embodiments, there are multiple liquid cooling plates, and the multiple liquid cooling plates are arranged at intervals along a preset direction. The liquid cooling plates have a first cooling surface and a second cooling surface opposite to each other along the height direction of the battery cell. The top surface of each battery cell is connected to the first cooling surface of at least one liquid cooling plate, and each bus is connected to at least one first cooling surface and / or the second cooling surface.

[0020] In some embodiments, a heat conductor is provided between the liquid cooling plate and the bus bar and between the liquid cooling plate and the top surface of the battery cell; and / or an insulating layer is provided on the surface of the liquid cooling plate and the surface of the bus bar.

[0021] In a second aspect, an embodiment of the present disclosure provides a battery pack, comprising a battery box and the battery module as described above.

[0022] In a third aspect, an embodiment of the present disclosure provides a vehicle, comprising the battery module or the battery pack as described above.

[0023] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0024] Using the battery module provided by the first aspect of the embodiment of the present disclosure, when the battery module is in a high-temperature cooling condition, the heat of the battery module is mostly concentrated on the top of the battery cell. Therefore, the liquid cooling plate can cool the battery cell through the busbar and the pole to take away the heat generated by the mechanical parts such as the winding tabs in the battery cell and the busbar, thereby quickly reducing the temperature of the battery cell. When the battery module is in a low-temperature heating condition, the battery cell as a whole is at a relatively low temperature. Therefore, the liquid cooling plate and the heating film assembly can heat the battery cell at the same time to improve the uniformity of the heating of the battery cell and help to increase the heating rate. In addition, the battery module of the embodiment of the present disclosure can reduce the production cost of the battery module and make the structure of the battery module more compact compared to the heat exchange structure of the liquid cooling plate set on the bottom wall or side wall of the battery cell by setting the heating film assembly. Therefore, the battery module of the embodiment of the present disclosure does not affect its heating requirements under low-temperature heating conditions, and has a compact structure, which is conducive to reducing production costs and can increase battery capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without inventive work, including:

[0027] FIG1 is an exploded view of a battery module according to an embodiment of the present disclosure.

[0028] FIG2 is a partial exploded view of a battery module according to an embodiment of the present disclosure.

[0029] FIG3 is an exploded view of a battery module according to another embodiment of the present disclosure.

[0030] FIG4 is an exploded view of a battery module according to another embodiment of the present disclosure.

[0031] FIG5 is a schematic diagram of a second heating film or a third heating film of a battery module according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present disclosure in more detail with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0033] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0034] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0035] The following describes the battery module assembly, battery pack and vehicle according to the embodiments of the present disclosure with reference to Figures 1 to 5.

[0036] As shown in Figures 1 to 5, the battery module of the present embodiment includes: a cell group 2, a liquid cooling assembly 3, and a heating film assembly 4. The cell group 2 includes a plurality of cells 21 arranged in an array within the battery box 1. The liquid cooling assembly 3 includes a liquid cooling plate 31 and a bus bar 32. The liquid cooling plate 31 is disposed at the edges of the cells 21 along the large surface. The liquid cooling plate 31 is connected to the bus bar 32 and the poles of the cells 21. At least part of the heating film assembly 4 is disposed on at least one of the side walls or the bottom wall of the cells 21. The liquid cooling plate 31 is disposed on the upper portion of the cells 21, and the heating film assembly 4 is disposed on the lower portion of the cells 21.

[0037] It can be understood that the liquid cooling plate 31 is arranged on the upper part of the battery cell 21, where "upper part" refers to the part of the battery cell 21 with the pole, and at least part of the area of ​​the liquid cooling plate 31 can cool the pole, that is, the liquid cooling plate 31 can only cool the pole of the battery cell 21 alone, or it can cool the large surface and / or the side of the battery cell 21 while cooling the pole of the battery cell 21.

[0038] The shape of the liquid cooling plate 31 can be arbitrarily set according to actual conditions, as long as it can directly or indirectly ensure the cooling effect of the poles of the battery cells 21.

[0039] In some embodiments, the liquid cooling plate 31 may be a flat liquid cooling plate 31 to cool the poles of the battery cells 21 individually.

[0040] In some embodiments, the liquid cooling plate 31 is an L-shaped liquid cooling plate 31, that is, part of the liquid cooling plate 31 is located on the side of the battery cell 21, and another part of the liquid cooling plate 31 is located on the side of the battery cell 21. In this way, the liquid cooling plate 31 can cool the battery cell 21 and the side of the battery cell 21.

[0041] In some embodiments, the liquid cooling plate 31 is an L-shaped liquid cooling plate 31, that is, part of the liquid cooling plate 31 is located on the side of the battery cell 21 pole, and another part of the liquid cooling plate 31 is located on the side of the battery cell 21 large surface. In this way, the liquid cooling plate 31 can cool the pole on the one hand and cool the large surface of the battery cell 21 on the other hand.

[0042] In some embodiments, a portion of the liquid cooling plate 31 is located on the side of the battery cell 21 pole, a portion is located on the side of the battery cell 21 large surface, and a portion is located on the side of the battery cell 21. Thus, the liquid cooling plate 31 can cool the pole on one hand, and cool the large surface and side of the battery cell 21 on the other hand.

[0043] It is understood that the heating film assembly 4 is disposed at the lower portion of the battery cell 21, where "lower portion" refers to a portion away from the pole of the battery cell 21, and includes the bottom, side, and / or large surface of the battery cell 21. In other words, the heating film assembly 4 only needs to be disposed on at least one side of the area of ​​the battery cell 21 away from the pole.

[0044] In some embodiments, the heating film assembly 4 is disposed at the bottom of the battery cell 21 away from the pole, so as to heat the battery cell 21 .

[0045] In some embodiments, the heating film assembly 4 is disposed on the side of the battery cell 21 to heat the battery cell 21 .

[0046] In some embodiments, the heating film assembly 4 is disposed on the large surface of the battery core 21 to heat the battery core 21 .

[0047] In some embodiments, part of the heating film assembly 4 is located at the bottom of the battery cell 21 away from the pole, and another part of the heating film assembly 4 is located on the large surface of the battery cell 21 to heat the battery cell 21 .

[0048] In some embodiments, a portion of the heating film assembly 4 is located at the bottom of the battery cell 21 away from the pole, and another portion of the heating film assembly 4 is located on the side of the battery cell 21 to heat the battery cell 21 .

[0049] In some embodiments, part of the heating film assembly 4 is located on the large surface of the battery cell 21 , and another part of the heating film assembly 4 is located on the side of the battery cell 21 , so as to heat the battery cell 21 .

[0050] In some embodiments, part of the heating film assembly 4 is located at the bottom of the battery cell 21 away from the pole, part of the area is located on the large surface of the battery cell 21, and part of the area is located on the side of the battery cell 21, so as to heat the battery cell 21.

[0051] According to the battery module of the disclosed embodiment, when the battery module is in a high-temperature cooling condition, the heat of the battery module is mostly concentrated at the top of the battery cell 21. Therefore, the liquid cooling plate 31 can cool the battery cell 21 through the busbar 32 and the pole, thereby removing the heat generated by the mechanical parts such as the winding tabs in the battery cell 21 and the busbar 32, thereby quickly reducing the temperature of the battery cell. When the battery module is in a low-temperature heating condition, the battery cell is at a relatively low temperature. Therefore, the liquid cooling plate 31 and the heating film assembly 4 can heat the upper and lower parts of the battery cell 21 simultaneously, thereby improving the uniformity of the heating of the battery cell 21 and facilitating an increase in the heating rate.

[0052] The battery module of the disclosed embodiment, by providing a heating membrane assembly 4, can reduce the production cost of the battery module and make the battery module structure more compact, compared to heat exchange structures that provide liquid cooling plates on the bottom wall or side walls of the battery cell 21. Therefore, the battery module of the disclosed embodiment does not affect the heating requirements under low-temperature heating conditions, and the structure is compact, which helps reduce production costs and increase battery capacity.

[0053] In some embodiments, as shown in Figures 1 and 2, the heating film assembly 4 includes a first heating film 41, which is disposed on the bottom wall of the battery cell assembly 2. The first heating film 41 includes a first edge film 411 and a first intermediate film 412. The first edge film 411 is disposed on one side of the first intermediate film 412 along a first direction (X direction). The first edge film 411 and the first intermediate film 412 both extend along a second direction (Y direction). The first and second directions are orthogonal to the vertical direction of the battery cells 21. The battery cells 21 adjacent to the side wall of the battery case 1 correspond to the first edge film 411, while the battery cells 21 facing away from the side wall of the battery case 1 correspond to the first intermediate film 412. The power density of the first edge film 411 is greater than the power density of the first intermediate film 412. It should be noted that power density refers to the heating power per unit area of ​​the heating film.

[0054] It is understood that, as shown in FIG2 , the first side film 411 is provided at the edge of the first heating film 41 . When the battery module is in a low-temperature operating condition, the battery cells 21 adjacent to the side wall of the battery box 1 (the battery cells 21 located in the outer ring of the battery pack) can be heated by the first side film 411 , and the battery cells 21 away from the side wall of the battery box 1 (the battery cells 21 located in the inner ring of the battery pack) can be heated by the first intermediate film 412 . The inventors of this application have found through experimental research that the temperature of the battery cells 21 located in the outer ring of the battery pack is lower than that of the battery cells 21 in the inner ring. Therefore, by making the power density of the first side film 411 greater than the power density of the first intermediate film 412, the uniformity of heating of the battery cells 21 in the battery module can be improved.

[0055] For example, as shown in Figure 1, the first heating film 41 has a rectangular structure, and the first side film 411 can be arranged on opposite sides of the first heating film 41 along the X direction, or the first side film 411 can be arranged on opposite sides of the first heating film 41 along the Y direction, or the first side film 411 can be arranged at the four edges of the first heating film 41, thereby increasing the heating rate of the battery cells 21 located in the outer circle.

[0056] Furthermore, as shown in Figures 1, 3, and 4, the battery module also includes a thermal insulation pad 5, which is disposed between the first heating film 41 and the bottom of the battery box 1. Specifically, the bottom of the battery box 1 has a tray 11, and the thermal insulation pad 5 is disposed between the first heating film 41 and the tray 11. The thermal insulation pad 5 can reduce heat loss from the first heating film 41, thereby improving the heating efficiency of the battery module.

[0057] In some embodiments, as shown in Figures 3 and 4 , the heating film assembly 4 further includes a second heating film 42 and a third heating film 43. The second heating film 42 is disposed on the side of the cell group 2 adjacent to the side wall of the battery case 1, and the third heating film 43 is disposed between the walls of adjacent battery cells 21. It is understood that the second heating film 42 is disposed on the outer side wall of the cell group 2. In other words, the second heating film 42 is disposed between the inner side wall of the battery case 1 and the outer side wall of the battery group. For example, the second heating film 42 may be disposed on both outer sides of the cell group 2 along the X direction, or both outer sides of the cell group 2 along the Y direction, or all four outer sides of the cell group 2 along the X and Y directions. The third heating film 43 may be disposed between the side faces of adjacent battery cells 21, or between the large surfaces of adjacent battery cells 21. The battery module of the embodiment of the present disclosure can further improve the heating rate of the battery module by arranging the second heating film 42 and the third heating film 43 in the above-mentioned structure, and is conducive to ensuring the uniformity of the heating of the battery cell 21.

[0058] In one example, the battery cell group 2 has multiple battery cells 21 along both a first direction (X direction) and a second direction (Y direction). The first direction, the second direction, and the vertical direction of the battery cells 21 are orthogonal to each other. There are multiple second heating films 42, each of which is disposed on the wall surface of the battery cell group 2 along either the first direction or the second direction. There are multiple third heating films 43, each of which is spaced apart along the first direction between the walls of adjacent battery cells 21 and extends along the second direction.

[0059] It is understood that the second heating film 42 is provided on the four outer walls of the battery cell group 2, and the third heating film 43 is provided between the large surfaces of each pair of adjacent battery cells 21, and also between the side surfaces of each pair of adjacent battery cells 21. This can further improve the heating rate of the battery module and help ensure uniform heating of the battery cells 21.

[0060] Optionally, as shown in Figures 1 and 2, the power density of the first side film 411 is ≥ A*the power density of the first intermediate film 412, where 1<A≤2. It is understood that when the power density of the first side film 411 is less than A times the power density of the first intermediate film 412, the first side film 411 dissipates heat faster, which can easily cause the heating temperature of the first side film 411 to be lower than the heating temperature of the first intermediate film 412, leading to temperature imbalance between the battery cells 21 and reduced performance of the battery cells 21. When the power density of the first side film 411 is greater than A times the power density of the first intermediate film 412, the temperature of the first side film 411 is excessively high, resulting in increased energy consumption. Furthermore, the temperature of the first side film 411 is higher than the temperature of the first intermediate film 412, leading to temperature imbalance between the battery cells 21 and reduced performance of the battery cells 21.

[0061] For example, the value of A can be 1.1, 1.5, 1.7, or 2. Preferably, the value of A is 1.1. That is, the power density of the first side film 411 is ≥ 1.1 times the power density of the first middle film 412. Through experimental research, the inventors of this application have discovered that when the power density of the first side film 411 is within the above value range, it can ensure uniform heating between the battery cells 21 while reducing the power consumption of the battery cells 21 and lowering costs.

[0062] Optionally, the power density of the second heating film 42 is ≥ A*(the power density of the third heating film 43 / 2), and 1<A≤2. It is understood that since the third heating film 43 needs to heat the battery cells 21 on both sides simultaneously, the second heating film 42 only heats the battery cells 21 on one side, thereby appropriately reducing the power density of the second heating film 42.

[0063] When the power density of the second heating film 42 is lower than A times the power density of the third heating film 43, the second heating film 42 dissipates heat faster, which can easily cause the heating temperature of the second heating film 42 to be lower than the heating temperature of the third heating film 43. This in turn leads to temperature imbalance among the battery cells 21, reducing the performance of the battery cells 21. When the power density of the second heating film 42 is higher than A times the power density of the third heating film 43, the temperature of the second heating film 42 is too high, resulting in increased energy consumption. In addition, the temperature of the second heating film 42 is higher than that of the first intermediate film 412, causing temperature imbalance among the battery cells 21 and reducing the performance of the battery cells 21.

[0064] For example, the value of A can be 1.1, 1.5, 1.7, or 2. Preferably, the value of A is 1.1. That is, the power density of the second heating film 42 is ≥ 1.1 times the power density of the third heating film 43, which is half. Through experimental research, the inventors of this application have found that when the power density of the second heating film 42 is within the above value range, it can not only ensure the uniformity of the temperature between the battery cells 21, but also reduce the power consumption of the battery cells 21 and reduce costs.

[0065] In some embodiments, as shown in Figures 1, 2, and 5, at least one of the first side film 411, the first middle film 412, the second heating film 42, and the third heating film 43 includes a wiring segment 44 and a middle segment 45. The wiring segment 44 is located on one side of the middle segment 45 in the longitudinal direction, and the power density of the wiring segment 44 is greater than that of the middle segment 45. In the embodiments of the present application, the first side film 411, the first middle film 412, the second heating film 42, and the third heating film 43 all employ a heating structure with a wiring segment 44 and a middle segment 45. As shown in Figure 5, using the second heating film 42 or the third heating film 43 as an example, two wiring segments 44 are arranged on either side of the middle segment 45 in the longitudinal direction. The wiring segments 44 are used for external wiring. It is understood that the wiring segments 44 are closer to the side wall of the battery case 1 than the middle segment 45. This increases the temperature of the battery cells 21 located near the side wall of the battery case 1, thereby ensuring uniform heating of the entire group 2 of battery cells 21 in the battery module.

[0066] Optionally, the power density of the wiring segment 44 is ≥A*the power density of the middle segment 45, and 1<A≤2. It is understandable that when the power density of the wiring segment 44 is lower than A times the power density of the middle segment 45, the wiring segment 44 dissipates heat faster, which can easily cause the heating temperature of the wiring segment 44 to be lower than the heating temperature of the middle segment 45, thereby causing temperature imbalance between the battery cells 21 and reducing the performance of the battery cells 21. When the power density of the wiring segment 44 is higher than A times the power density of the middle segment 45, the temperature of the wiring segment 44 is too high, resulting in increased energy consumption, and the temperature of the wiring segment 44 is higher than the temperature of the middle segment 45, resulting in temperature imbalance between the battery cells 21 and reducing the performance of the battery cells 21.

[0067] For example, the value of A can be 1.1, 1.5, 1.7, or 2. Preferably, the value of A is 1.1. That is, the power density of the wiring segment 44 is ≥ 1.1 times the power density of the middle segment 45. The inventors of this application have discovered through experimental research that when the power density of the wiring segment 44 is within the above value range, it can ensure uniform heating between the battery cells 21 while reducing the power consumption of the battery cells 21 and lowering costs.

[0068] In one example, the first heating film 41, the second heating film 42 and the third heating film 43 all have the function of active heat preservation. Within a specific time, when the battery cell 21 is lower than the set temperature, the heating film assembly 4 is awakened to heat the battery cell 21. After heating to the target temperature, the heating film assembly 4 stops heating. This can ensure that the battery cell 21 is always in a comfortable temperature range under low temperature conditions.

[0069] In some embodiments, as shown in FIG2 , there are multiple liquid cooling plates 31 , which are spaced apart along a preset direction. The liquid cooling plates 31 have a first cooling surface and a second cooling surface (i.e., the upper and lower sides of the liquid cooling plates 31 ) that are opposite to each other along the height direction of the battery cell 21 . The top surface of each battery cell 21 is connected to the first cooling surface of at least one liquid cooling plate 31 , and each bus bar 32 is connected to at least one first cooling surface and / or second cooling surface. It is understood that the liquid cooling plate 31 is adjacent to the poles on the battery cell 21 to achieve effective cooling of the poles. Each bus bar 32 can be connected to the first cooling surface of the liquid cooling plate 31 for heat exchange or to the second cooling surface for heat exchange, thereby increasing the total heat exchange area between the liquid cooling plate 31, the bus bar 32, and the battery cell 21 . The liquid cooling plate 31 can also directly cool the bus bar 32 , thereby allowing the heat generated by the mechanical parts such as the winding tabs in the battery cell 21 to be quickly removed by the liquid cooling plate 31 through the poles and the bus bar 32 , thereby improving the heat exchange efficiency of the battery module.

[0070] For example, the liquid cooling plate 31 is provided with multiple heat exchange channels, each containing a heat exchange medium, such as an ethylene glycol solution or a refrigerant. A manifold 33 and a water nozzle 34 are provided at the end of the liquid cooling plate 31. The manifold 33 connects multiple liquid cooling plates 31 in series, and the cooling medium is introduced into the manifold 33 through the water nozzle 34.

[0071] Optionally, a heat conductor (not shown) is provided between the liquid cooling plate 31 and the busbar 32, and between the liquid cooling plate 31 and the top surface of the battery cell 21. The heat conductor may be a thermally conductive adhesive or a thermally conductive pad, thereby improving the heat exchange efficiency of the liquid cooling plate 31. To avoid the risk of a short circuit between the liquid cooling plate 31 and the battery cell 21, an insulating layer is provided on the surface of the liquid cooling plate 31 and the busbar 32. The insulating layer may be an insulating film or insulating varnish.

[0072] A battery pack according to an embodiment of the present disclosure includes a battery box and a battery module according to an embodiment of the present disclosure.

[0073] According to the battery pack of the embodiment of the present disclosure, when the battery module is under high-temperature cooling conditions, the heat of the battery module is mostly concentrated on the top of the battery cell 21, so the liquid cooling plate 31 can cool the battery cell 21 through the bus 32 and the pole to take away the heat generated by the mechanical parts such as the winding tabs in the battery cell 21 and the bus 32, thereby quickly reducing the temperature of the battery cell. When the battery module is under low-temperature heating conditions, the battery cells as a whole are at a relatively low temperature, so the liquid cooling plate 31 and the heating film assembly 4 can heat the battery cells 21 at the same time to improve the uniformity of the heating of the battery cells 21, and help to increase the heating rate. Therefore, the battery module of the embodiment of the present disclosure heats the battery cells at the same time through the liquid cooling plate and the heating module, which can solve the technical problem of the slow heating rate of the battery under low-temperature conditions in the prior art and maintain the stability of the battery performance.

[0074] The vehicle according to the embodiment of the present disclosure includes the battery module or battery pack according to the embodiment of the present disclosure. The technical advantages of the vehicle according to the embodiment of the present disclosure are the same as the technical advantages of the battery module or battery pack according to the above-mentioned embodiment, and will not be repeated here.

[0075] It should be noted that, in the description of the present disclosure, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present disclosure.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0077] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0078] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0079] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0080] The foregoing are merely specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not to be limited to the embodiments described herein, but is to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A battery module assembly, comprising: a battery cell group (2), the battery cell group (2) including a plurality of battery cells (21), and the plurality of battery cells (21) being arranged in an array in a battery box (1); a liquid cooling assembly (3), the liquid cooling assembly (3) including a liquid cooling plate (31) and a bus bar (32), the liquid cooling plate (31) being connected to the bus bar (32) and the pole posts of the battery cells (21); a heating film assembly (4), at least part of the heating film assembly (4) being disposed on at least one of the side walls and the bottom wall of the battery cell (21); the liquid cooling plate (31) is disposed above the battery cell (21), and the heating film assembly (4) is disposed below the battery cell (21).

2. The battery module according to claim 1, wherein the heating film assembly (4) includes a first heating film (41), the first heating film (41) being disposed on the bottom wall of the battery cell group (2), the first heating film (41) including a first side film (411) and a first intermediate film (412), the first heating film (41) including the first side film (411) and the first intermediate film (412), the first side film (411) being disposed on one side of the first intermediate film (412) along a first direction, both the first side film (411) and the first intermediate film (412) extending along a second direction, the first direction, the second direction, and the up-down direction of the battery cell (21) being orthogonal to each other in pairs, the battery cells (21) adjacent to the side wall of the battery box (1) corresponding to the first side film (411), and the battery cells (21) facing away from the side wall of the battery box (1) corresponding to the first intermediate film (412), and the power density of the first side film (411) being greater than the power density of the first intermediate film (412).

3. The battery module according to claim 2, wherein the heating film assembly (4) further includes a second heating film (42) and a third heating film (43), the second heating film (42) being disposed on one side of the battery cell group (2) adjacent to the side wall of the battery box (1), and the third heating film (43) being disposed between the wall surfaces of adjacent battery cells (21).

4. The battery module according to claim 3, wherein the battery cell group (2) has a plurality of battery cells (21) along both the first direction and the second direction, the second heating film (42) is plural, and the plural second heating films (42) are disposed on the wall surface of the battery cell group (2) along any one of the first direction and the second direction; and / or, the third heating film (43) is plural, the plural third heating films (43) are arranged at intervals between the wall surfaces of adjacent battery cells (21) along one of the first direction and the second direction, and the third heating film (43) extends along the other of the first direction and the second direction.

5. The battery module according to claim 3 or 4, wherein the power density of the first side film (411) ≥ A * the power density of the first intermediate film (412), 1 < A ≤ 2; And / or, the power density of the second heating film (42) ≥ A * (the power density of the third heating film (43) / 2), where 1 < A ≤ 2.

6. The battery module according to any one of claims 3-5, at least one of the first side film (411), the first intermediate film (412), the second heating film (42), and the third heating film (43) includes a wiring section (44) and an intermediate section (45), the wiring section (44) is disposed on one side in the length direction of the intermediate section (45), and the power density of the wiring section (44) ≥ A * the power density of the intermediate section (45), where 1 < A ≤ 2.

7. The battery module according to claim 5 or 6, A = 1.

1.

8. The battery module according to any one of claims 2-7, the battery module further includes a heat insulation pad (5), and the heat insulation pad (5) is disposed between the first heating film (41) and the bottom of the battery box (1).

9. The battery module according to any one of claims 1-8, there are a plurality of liquid cooling plates (31), the plurality of liquid cooling plates (31) are arranged at intervals along a preset direction, the liquid cooling plate (31) has a first cooling surface and a second cooling surface opposite to each other in the height direction of the battery cell (21), the top surface of each battery cell (21) is in contact with the first cooling surface of at least one liquid cooling plate (31), and each bus bar (32) is in contact with at least one of the first cooling surface and / or the second cooling surface.

10. The battery module according to claim 9, a heat conducting member is provided between the liquid cooling plate (31) and the bus bar (32) and between the liquid cooling plate (31) and the top surface of the battery cell (21); And / or, an insulating layer is provided on the surface of the liquid cooling plate (31) and the surface of the bus bar (32).

11. A battery pack, comprising: A battery box (1); A battery module, where the battery module is the battery module according to any one of claims 1-10.

12. A vehicle, comprising the battery module according to any one of claims 1-10 or the battery pack according to claim 11.

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