Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack, which has a first direction and a second direction which are intersected, and comprises a box body, a battery module, a liquid inlet joint and a liquid outlet joint, the box body is provided with a containing cavity, and the battery module is arranged in the containing cavity. The containing cavity is filled with a heat exchange medium, the heat exchange medium immerses the battery module, the battery module comprises a plurality of battery cells, the surfaces of the battery cells are covered with insulating films, and the sides, away from the battery cells, of the insulating films are covered with insulating anti-drag films. A liquid inlet connector and a liquid outlet connector are arranged on the box body, and both the liquid inlet connector and the liquid outlet connector are communicated with the containing cavity and the outer side of the box body. According to the battery pack disclosed by the utility model, the two layers of films with an insulating effect can ensure the insulating effect between the two adjacent battery cells, and the battery cell insulation failure cannot be caused even if one layer of film is lost or damaged. In addition, the insulating resistance-reducing film also has a resistance-reducing effect, so that the flow resistance of the heat exchange medium on the surface of the battery cell can be reduced, and the flow resistance of the heat exchange medium in the accommodating cavity is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] Lithium-ion batteries, as a new type of energy source, have advantages such as high energy density, no memory effect, long cycle life, and no pollution, and are widely used in various fields. The ideal operating temperature for lithium-ion batteries is between 20-35℃, and the temperature difference between cells within a module should not exceed 5℃. Uneven temperature differences within the module will lead to a reduction in cycle life and an increase in the voltage difference between cells. This will cause individual cells to prematurely enter the voltage limit protection state during charging, resulting in the entire module being unable to charge. Efficient thermal management design is the key to the safe and large-scale use of lithium-ion battery energy storage.

[0003] However, most lithium-ion batteries currently use air cooling or cold plate liquid cooling for heat dissipation. Air cooling consumes 2-3 times more energy than liquid cooling, and the heat dissipation is uneven. Cold plate liquid cooling carries the risk of internal liquid leakage, which can easily lead to short circuits. On the other hand, cold plate liquid cooling can also cause uneven temperature distribution within the cell. Immersion liquid cooling solves the problem of inconsistent cell temperatures, ensuring that the temperature difference between cells does not exceed 2°C. However, immersion liquid cooling places higher demands on the cell insulation. The original blue film coating is insufficient for high-voltage applications, and there is a certain probability that the blue film will break, affecting the insulation effect. In addition, the coefficient of friction of PET blue film is 0.2-1.0, which also results in relatively high resistance to fluids, which is not conducive to the energy saving of the cooling system.

[0004] Therefore, there is an urgent need for a battery pack to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a battery pack that improves the insulation performance of the battery cells and reduces the flow resistance of the heat exchange medium within the battery pack cavity.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A battery pack having intersecting first and second directions, including a housing, a battery module, an inlet connector, and an outlet connector;

[0008] The housing has a receiving cavity, and the battery module is disposed within the receiving cavity;

[0009] The cavity is filled with a heat exchange medium, which immerses the battery module. The battery module includes multiple battery cells, the surface of which is covered with an insulating film. An insulating drag-reducing film is also covered on the side of the insulating film facing away from the battery cell.

[0010] The housing is equipped with an inlet connector and an outlet connector, both of which connect the receiving cavity to the outside of the housing.

[0011] As an improvement to the above technical solution, the insulating film is a PET film, and the insulating drag-reducing film is a PTFE film.

[0012] As an improvement to the above technical solution, the thickness of the insulating film is 90μm-120μm, and the thickness of the insulating drag-reducing film is 80μm-130μm.

[0013] As an improvement to the above technical solution, the battery cell includes a housing, an electrode assembly, a terminal post, and an explosion-proof valve. The electrode assembly is disposed inside the housing. The terminal post has a first end and a second end disposed opposite to each other. One end of the terminal post is exposed outside the housing, and the second end passes through the housing and is connected to the electrode assembly. The explosion-proof valve is disposed on the housing. The side of the housing away from the electrode assembly is covered with the insulating film.

[0014] As an improvement to the above technical solution, the battery module has a plurality of cells arranged sequentially along the first direction. The battery module also includes a separator, and the separator is provided between two adjacent cells. The separator and the adjacent cell each have a first flow channel, and the first flow channel connects the two sides of the battery module along the first direction.

[0015] As an improvement to the above technical solution, the partition includes a longitudinal plate and a transverse plate. The longitudinal plate is sandwiched between two adjacent cells. The transverse plate is fixedly connected to both ends of the longitudinal plate along the second direction. The longitudinal plate is connected to the middle of the transverse plate along the first direction.

[0016] As an improvement to the above technical solution, the longitudinal plate is provided with grooves extending along the second direction on both sides. The groove walls and the adjacent battery cells form an intermediate flow channel section. The horizontal plate is provided with flow holes corresponding to the intermediate flow channel sections. The flow holes connect the two sides of the horizontal plate along the first direction. The first flow channel includes the intermediate flow channel section and the corresponding flow holes.

[0017] As an improvement to the above technical solution, multiple battery modules are provided, and the multiple battery modules are spaced apart along the second direction. A second flow channel is provided between two adjacent battery modules, and at least one end of the first flow channel is connected to the second flow channel.

[0018] As an improvement to the above technical solution, the inlet connector and the outlet connector are respectively located at both ends of the housing along the second direction.

[0019] As an improvement to the above technical solution, the battery pack also has a third direction, wherein the first direction, the second direction and the third direction intersect each other, the housing includes a bottom plate, a cover plate and a side plate, the cover plate and the bottom plate are spaced apart along the third direction, the side plate is disposed between the bottom plate and the cover plate, and the bottom plate, the cover plate and the side plate surround to form the receiving cavity;

[0020] A third flow channel is provided between the side plate and the adjacent battery module. Both ends of the second flow channel are connected to the third flow channel. The first flow channel connects two adjacent second flow channels or connects the second flow channel and the third flow channel.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] In this battery pack, the heat exchange medium enters the receiving cavity through the inlet connector and exits through the outlet connector, filling the housing with the heat exchange medium and immersing the battery module. The continuously flowing heat exchange medium immerses the battery module and allows for efficient heat exchange, resulting in a superior heat exchange effect for the battery module. Furthermore, the surface of the battery cell is covered with an insulating film, and this insulating film is further covered with an insulating drag-reducing film. These two insulating layers ensure effective insulation between adjacent cells; even if one layer is missing or damaged, insulation failure will not occur. In addition, the insulating drag-reducing film reduces the flow resistance of the heat exchange medium on the cell surface and within the receiving cavity, thereby improving coolant flow efficiency, increasing heat exchange efficiency, and reducing energy consumption. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0024] Figure 2 This is an exploded view of the battery pack provided in an embodiment of this utility model;

[0025] Figure 3 This is an isometric view of a portion of the structure of the battery pack provided in this embodiment of the present invention;

[0026] Figure 4 This is a top view of a portion of the structure of the battery pack provided in this embodiment of the present invention;

[0027] Figure 5 This is a side view of the battery module of the battery pack provided in this embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the separator of the battery module of the battery pack provided in this embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the battery cell of the battery module in the battery pack provided in this embodiment of the utility model.

[0030] In the picture:

[0031] X, first direction; Y, second direction; Z, third direction;

[0032] 11. Box body;

[0033] 111. Base plate; 112. Cover plate; 113. Side plate; 1131. First side plate; 1132. Second side plate; 1133. Third side plate; 1134. Fourth side plate;

[0034] 12. Battery module;

[0035] 121. Battery cell; 1211. Housing; 1212. Terminal; 1213. Explosion-proof valve;

[0036] 122. Partition;

[0037] 1221, Longitudinal plate; 12211, Groove; 1222, Horizontal plate; 12221, Flow hole;

[0038] 123. End plate; 124. Cable tie; 125. Flexible circuit board; 126. Plastic part;

[0039] 13. Liquid inlet connector; 14. Liquid outlet connector; 15. Insulating sheet; 16. Positive high voltage connector; 17. Negative high voltage connector; 18. BMU; 19. Protective housing; 20. MSD; 21. Connector;

[0040] 100. Receiving cavity;

[0041] 200, First flow channel; 300, Second flow channel; 400, Third flow channel; 401, First flow channel section; 402, Second flow channel section; 403, Third flow channel section; 404, Fourth flow channel section. Detailed Implementation

[0042] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] like Figures 1-4 As shown, this embodiment provides a battery pack with intersecting and perpendicular first direction X, second direction Y, and third direction Z. The battery pack includes a housing 11, a battery module 12, an inlet connector 13, and an outlet connector 14. The housing 11 has a receiving cavity 100, and the battery module 12 is disposed within the receiving cavity 100. The receiving cavity 100 is filled with a heat exchange medium, which immerses the battery module 12. The battery module 12 includes multiple battery cells 121, the surface of which is covered with an insulating film. The side of the insulating film facing away from the battery cell 121 is covered with an insulating drag-reducing film. The housing 11 is provided with an inlet connector 13 and an outlet connector 14, both of which connect the receiving cavity 100 to the outside of the housing 11.

[0047] In this embodiment, the heat exchange medium can enter the receiving cavity 100 through the inlet connector 13 and flow out of the receiving cavity 100 through the outlet connector 14, filling the housing 11 with heat exchange medium and immersing the battery module 12. The continuously flowing heat exchange medium immersing the battery module 12 can efficiently exchange heat with the battery module 12, resulting in a better heat exchange effect for the battery module 12. Furthermore, the surface of the battery cell 121 of the battery module 12 is covered with an insulating film, and the surface of the insulating film is covered with an insulating drag-reducing film. The two insulating films can ensure the insulation effect between two adjacent cells 121. Even if one layer of the film is missing or damaged, it will not cause the insulation failure of the cell 121. In addition, the insulating drag-reducing film also has a drag-reducing effect, which can reduce the flow resistance of the heat exchange medium on the surface of the cell 121 and reduce the flow resistance of the heat exchange medium in the receiving cavity 100, thereby improving the flow efficiency of the coolant, thus improving the heat exchange efficiency and reducing energy consumption.

[0048] Furthermore, in this embodiment, the insulating film is a PET film (blue film), and the insulating drag-reducing film is a PTFE film (polytetrafluoroethylene film). Both PET and PTFE films have good insulation properties. The coefficient of friction of PET film is 0.2-1.0, and that of PTFE film is 0.04-0.1. Compared with PET film, PTFE film has a lower coefficient of friction. Covering the PET film with a PTFE film can further reduce the flow resistance of the heat exchange medium on the surface of cell 121.

[0049] Optionally, the thickness of the insulating film is 90μm-120μm, and the thickness of the insulating drag-reducing film is 80μm-130μm. Preferably, in this embodiment, the thickness of the insulating film is 113μm, and the thickness of the insulating drag-reducing film is 100μm.

[0050] In this embodiment, a PET film is first adhered to the surface of the battery cell 121, followed by a PTFE film coating. The specific process for coating the PTFE film is as follows: a dry film lubricant is applied to the surface of the battery cell 121 by spraying or immersion. The dry film lubricant can be formed by natural air drying or low-temperature (35°C) drying, without the need for UV lamp irradiation. After drying, the dry film lubricant forms a PTFE film with a thickness of approximately 100 μm and good insulation performance. Spraying or immersion coating methods require lower equipment investment costs. The dry film lubricant in this embodiment is a solution prepared by mixing a non-flammable fluorine solvent with perfluoropolyether oil, ultra-low molecular weight polytetrafluoroethylene (PTFE) particles, and additives. Since the PTFE film in this embodiment is formed by spraying or immersion coating and drying, there is a certain risk of uneven thickness. Therefore, in this embodiment, a layer of PET film is first adhered to the surface of the battery cell 121, followed by the PTFE film coating. Compared to setting a separate PTFE film, the combination of the PET film and the PTFE film better ensures the insulation effect.

[0051] In this embodiment, the heat exchange medium is an electronic fluorinated liquid. The electronic fluorinated liquid has advantages such as low surface tension, low evaporation potential, good electrical insulation, good thermal conductivity, good thermal stability, good chemical stability, small viscosity change at low temperature, and non-flammability. Filling the battery pack cavity 100 with electronic fluorinated liquid in this embodiment can greatly reduce the risk of fire during battery pack use.

[0052] Optionally, the battery cell 121 includes a housing 1211, an electrode assembly, a terminal post 1212, and an explosion-proof valve 1213. The electrode assembly is disposed within the housing 1211. The terminal post 1212 has a first end and a second end disposed opposite to each other. One end of the terminal post 1212 is exposed outside the housing 1211, and the second end passes through the housing 1211 and is connected to the electrode assembly. The explosion-proof valve 1213 is disposed on the housing 1211. The side of the housing 1211 facing away from the electrode assembly is covered with an insulating film, and the side of the insulating film facing away from the housing 1211 is covered with an insulating drag-reducing film. The surface of the terminal post 1212 is not covered with an insulating film or an insulating drag-reducing film to avoid affecting the conductivity of the terminal post 1212. Similarly, the surface of the explosion-proof valve 1213 is not covered with an insulating film or an insulating drag-reducing film to avoid the insulating film and insulating drag-reducing film affecting the normal rupture of the explosion-proof valve 1213.

[0053] Optionally, such as Figures 2-6 As shown, multiple battery cells 121 of the battery module 12 are arranged sequentially along a first direction X. The battery module 12 also includes a separator 122, with a separator 122 disposed between each adjacent battery cell 121. A first flow channel 200 is provided between the separator 122 and the adjacent battery cell 121, and the first flow channel 200 connects both sides of the battery module 12 along the first direction X. The separator 122 serves to separate adjacent battery cells 121, and the arrangement of the first flow channel 200 allows the heat exchange medium to flow through the surface between adjacent battery cells 121 within the battery module 12, enabling better heat exchange between the heat exchange medium and the battery cells 121 and preventing heat accumulation inside the battery module 12.

[0054] Furthermore, such as Figures 2-6 As shown, the partition 122 includes a longitudinal plate 1221 and a transverse plate 1222. The longitudinal plate 1221 is sandwiched between two adjacent cells 121. The transverse plate 1222 is fixedly connected to both ends of the longitudinal plate 1221 along the second direction Y. The longitudinal plate 1221 is connected to the middle of the transverse plate 1222 along the first direction X. One longitudinal plate 1221 and two transverse plates 1222 form an I-shaped partition 122. The transverse plate 1222 plays a positioning role for the cell 121 and prevents the cell 121 from moving along the second direction Y.

[0055] Furthermore, the battery module 12 also includes cable ties 124, which surround the outer side of the horizontal plate 1222 to bind and fix multiple battery cells 121 into a battery module 12. In this embodiment, the cable ties 124 are steel strips, and each battery module 12 is wrapped with multiple cable ties 124, with the multiple cable ties 124 on the battery module 12 spaced apart along the third direction Z.

[0056] Furthermore, the battery module 12 also includes an end plate 123, with an end plate 123 at each end of the battery module 12, and cable ties 124 wrapped around the outside of the end plate 123.

[0057] Furthermore, such as Figures 2-6 As shown, the longitudinal plate 1221 has grooves 12211 extending along the second direction Y on both sides. The groove walls of the grooves 12211 and the adjacent cells 121 form an intermediate flow channel section. The horizontal plate 1222 has flow holes 12221 corresponding to the intermediate flow channel section. The flow holes 12221 connect the two sides of the horizontal plate 1222 along the first direction X. The first flow channel 200 includes the intermediate flow channel section and the corresponding flow holes 12221.

[0058] Optionally, such as Figures 2-4 As shown, multiple battery modules 12 are arranged at intervals along the second direction Y. A second flow channel 300 is provided between each pair of adjacent battery modules 12, and at least one end of the first flow channel 200 is connected to the second flow channel 300. The arrangement of the second flow channel 300 allows the heat exchange medium to flow through the area between two adjacent battery modules 12, avoiding heat accumulation in the area between two adjacent battery modules 12. In this embodiment, one battery module 12 includes eight cells 121 connected in series, and the battery pack includes four battery modules 12 connected in series.

[0059] Furthermore, such as Figures 2-4 As shown, the liquid inlet connector 13 and the liquid outlet connector 14 are respectively located at both ends of the housing 11 along the second direction Y, so that the heat exchange medium in the housing cavity 100 forms a general trend of flowing from one end of the battery pack to the other end.

[0060] Optionally, such as Figures 1-4As shown, the housing 11 includes a bottom plate 111, a cover plate 112, and a side plate 113. The cover plate 112 and the bottom plate 111 are spaced apart along a third direction Z. The side plate 113 is disposed between the bottom plate 111 and the cover plate 112. The bottom plate 111, the cover plate 112, and the side plate 113 form a receiving cavity 100. A third flow channel 400 is provided between the side plate 113 and the adjacent battery module 12. Both ends of the second flow channel 300 are connected to the third flow channel 400. The first flow channel 200 connects two adjacent second flow channels 300 or connects the second flow channel 300 and the third flow channel 400. The third flow channel 400 allows heat exchange medium to flow between the side plate 113 and the adjacent battery module 12, preventing heat accumulation between the side plate 113 and the adjacent battery module 12. Furthermore, the third flow channel 400, which extends circumferentially along the receiving cavity 100, connects each of the second flow channels 300 into one unit, and connects each of the connected second flow channels 300 to the liquid inlet connector 13 and the liquid outlet connector 14.

[0061] Further, the side plate 113 includes a first side plate 1131, a second side plate 1132, a third side plate 1133, and a fourth side plate 1134. The first side plate 1131 and the third side plate 1133 are spaced apart along a first direction X, and the second side plate 1132 and the fourth side plate 1134 are spaced apart along a second direction Y. The third flow channel 400 includes a first flow channel section 401, a second flow channel section 402, a third flow channel section 403, and a fourth flow channel section 404. A first flow channel section 401 is provided between the first side plate 1131 and the adjacent battery module 12, and a second flow channel section 402 is provided between the second side plate 1132 and the adjacent battery module 12. One end of the second flow channel 300 is connected to the first flow channel section 401, and the other end is connected to the second flow channel section 402, so that the heat exchange medium entering the receiving cavity 100 through the liquid inlet connector 13 can flow through each of the second flow channels 300 toward the direction closer to the liquid outlet connector 14. A third flow channel section 403 is provided between the third side plate 1133 and the adjacent battery module 12, and a fourth flow channel section 404 is provided between the fourth side plate 1134 and the adjacent battery module 12. Both the third flow channel section 403 and the fourth flow channel section 404 are connected to the first flow channel 200 on the adjacent battery module 12, so that heat exchange medium can flow between the third side plate 1133 and the adjacent battery module 12 and between the fourth side plate 1134 and the adjacent battery module 12.

[0062] Optionally, such as Figure 2 and Figure 7As shown, the battery pack provided in this embodiment also includes an insulating sheet 15. The battery cell 121 has a terminal post 1212, which is located on the side of the battery cell 121 facing the cover plate 112. An insulating sheet 15 is disposed between the battery module 12 and the cover plate 112. The insulating sheet 15 serves to separate the terminal post 1212 of the battery cell 121 from the cover plate 112, further improving safety and preventing insulation failure caused by minor damage to the PTFE film of the battery cell 121. In this embodiment, the insulating sheet 15 is made of mica or silicone rubber.

[0063] Optionally, such as Figures 2-4 As shown, the battery module 12 provided in this embodiment also includes a plastic component 126, which is disposed in a one-to-one correspondence with the battery cell 121. The plastic component 126 covers the top of the corresponding battery cell 121, that is, the side of the battery cell 121 facing the cover plate 112. In this embodiment, the contact position between the terminal post 1212 of the battery cell 121 and the plastic component 126 is filled with silicone sealant, which improves the creepage distance between the terminal post 1212 and the aluminum shell of the battery cell 121.

[0064] Optionally, such as Figures 2-4 As shown, the battery module 12 provided in this embodiment also includes a flexible circuit board (FPC) 125, and each cell 121 of the battery module 12 is connected to the flexible circuit board 125 after being soldered together.

[0065] Optionally, such as Figures 1-4 As shown, the battery pack in this embodiment also includes a positive high-voltage connector 16, a negative high-voltage connector 17, and two connectors 21. One connector 21 connects the positive high-voltage connector 16 to the battery module 12, and the other connector 21 connects the negative high-voltage connector 17 to the battery module 12. The positive high-voltage connector 16 and the negative high-voltage connector 17 are used to establish an electrical connection between the battery pack and external devices.

[0066] Optionally, such as Figures 1-4 As shown, the battery pack in this embodiment also includes an MSD (manual maintenance switch) 20, a BMU (battery management unit) 18, and a protective case 19. The BMU 18 is used to collect voltage / temperature data from the battery module 12, perform battery equalization management, and conduct fault diagnosis and communication. The BMU 18 is connected to the flexible circuit board 125. The protective case 19 protects the BMU 18. The MSD 20 is used for rapid disconnection of the high-voltage circuit.

[0067] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack having intersecting first direction (X) and second direction (Y), characterized in that, It includes a housing (11), a battery module (12), an inlet connector (13), and an outlet connector (14). The housing (11) has a receiving cavity (100), and the battery module (12) is disposed in the receiving cavity (100); The cavity (100) is filled with a heat exchange medium, which immerses the battery module (12). The battery module (12) includes a plurality of cells (121). The surface of the cells (121) is covered with an insulating film, and the side of the insulating film away from the cells (121) is covered with an insulating drag-reducing film. The housing (11) is provided with an inlet connector (13) and an outlet connector (14), both of which are connected to the accommodating cavity (100) and the outside of the housing (11).

2. The battery pack according to claim 1, characterized in that, The insulating film is a PET film, and the insulating drag-reducing film is a PTFE film.

3. The battery pack according to claim 2, characterized in that, The thickness of the insulating film is 90μm-120μm, and the thickness of the insulating drag-reducing film is 80μm-130μm.

4. The battery pack according to claim 1, characterized in that, The battery cell (121) includes a housing (1211), an electrode assembly, a terminal post (1212), and an explosion-proof valve (1213). The electrode assembly is disposed inside the housing (1211). The terminal post (1212) has a first end and a second end disposed opposite to each other. One end of the terminal post (1212) is exposed outside the housing (1211), and the second end passes through the housing (1211) and is connected to the electrode assembly. The explosion-proof valve (1213) is disposed on the housing (1211). The side of the housing (1211) facing away from the electrode assembly is covered with the insulating film.

5. The battery pack according to any one of claims 1-4, characterized in that, The battery module (12) has a plurality of cells (121) arranged sequentially along the first direction (X). The battery module (12) also includes a separator (122). The separator (122) is provided between two adjacent cells (121). The separator (122) and the adjacent cell (121) each have a first flow channel (200). The first flow channel (200) connects the two sides of the battery module (12) along the first direction (X).

6. The battery pack according to claim 5, characterized in that, The partition (122) includes a longitudinal plate (1221) and a transverse plate (1222). The longitudinal plate (1221) is sandwiched between two adjacent cells (121). The transverse plate (1222) is fixedly connected to both ends of the longitudinal plate (1221) along the second direction (Y). The longitudinal plate (1221) is connected to the middle of the transverse plate (1222) along the first direction (X).

7. The battery pack according to claim 6, characterized in that, The longitudinal plate (1221) is provided with grooves (12211) extending along the second direction (Y) on both sides. The groove walls of the grooves (12211) and the adjacent cells (121) form an intermediate flow channel section. The horizontal plate (1222) is provided with flow holes (12221) corresponding to the intermediate flow channel section. The flow holes (12221) connect the horizontal plate (1222) on both sides along the first direction (X). The first flow channel (200) includes the intermediate flow channel section and the corresponding flow holes (12221).

8. The battery pack according to claim 7, characterized in that, The battery module (12) is provided in multiple ways. The multiple battery modules (12) are arranged at intervals along the second direction (Y). A second flow channel (300) is provided between two adjacent battery modules (12). At least one end of the first flow channel (200) is connected to the second flow channel (300).

9. The battery pack according to claim 8, characterized in that, The inlet connector (13) and the outlet connector (14) are respectively located at both ends of the housing (11) along the second direction (Y).

10. The battery pack according to claim 9, characterized in that, It also has a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) intersect each other, the box (11) includes a bottom plate (111), a cover plate (112) and a side plate (113), the cover plate (112) and the bottom plate (111) are spaced apart along the third direction (Z), the side plate (113) is disposed between the bottom plate (111) and the cover plate (112), the bottom plate (111), the cover plate (112) and the side plate (113) surround to form the receiving cavity (100). A third flow channel (400) is provided between the side plate (113) and the adjacent battery module (12). Both ends of the second flow channel (300) are connected to the third flow channel (400). The first flow channel (200) connects two adjacent second flow channels (300) or connects the second flow channel (300) and the third flow channel (400).

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