Battery modules and battery packs

Abstract

A battery module and battery pack are provided to overcome or at least partially overcome the shortcomings present in battery technology. The present application discloses a battery module and a battery pack, the battery module including a cell assembly and a tray, the cell assembly including a plurality of cell subassemblies, the plurality of cell subassemblies being spaced apart along a first direction, the cell subassembly including a plurality of cells, in any of the plurality of cell subassemblies, the plurality of cells being spaced apart along a second direction, the tray including a plurality of cell accommodating grooves spaced apart along the first direction, a coolant flow path being provided in the side wall of the cell accommodating groove, and one cell accommodating groove being provided corresponding to one cell subassembly.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on June 20, 2023, bearing application number 202321591191.4, the entire contents of which are incorporated herein by reference.

[0002] This application relates to battery technology, and more particularly to battery modules and battery packs. [Background technology]

[0003] As one of the core components of electric vehicles, power batteries are the energy core of electric vehicles. As the application of power battery technology becomes more widespread, the market has higher requirements for the driving range and safety of power batteries.

[0004] Currently, the most commonly used packing technology for power battery packs in the industry is the moduleless battery (Cell To Pack: CTP) technology, which eliminates the need for structures such as end plates, side plates, or straps, thereby reducing costs and improving the cost performance of the product. However, because power batteries generate a lot of heat during the charging and discharging process, related technologies require the addition of a liquid cooling plate to the cell tray to dissipate heat from the battery module in order to ensure the service life of the power battery, which makes the battery system design complicated and increases costs. Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION Embodiments of the present application provide a battery module and a battery pack to overcome or at least partially overcome the shortcomings present in the background art discussed above. [Means for solving the problem]

[0006] An embodiment of the present application provides a battery module, which includes a cell assembly and a tray.

[0007] The cell assembly includes a plurality of cell subassemblies, the plurality of cell subassemblies being spaced apart along a first direction, and the cell subassembly includes a plurality of cells, and in any of the plurality of cell subassemblies, the plurality of cells are spaced apart along a second direction.

[0008] The tray includes a plurality of cell accommodating grooves spaced apart in the first direction, each cell accommodating groove corresponding to one of the cell subassemblies, and a coolant flow path is provided within the side wall of the cell accommodating groove.

[0009] An embodiment of the present application provides a battery pack, which includes a housing and a plurality of cell units.

[0010] The housing includes a bottom plate and a plurality of side beams, which are fixedly mounted on the edges of the bottom plate to form a surrounding receiving cavity.

[0011] The plurality of cell units are located within the accommodating cavity, the plurality of cell units are spaced apart along the first direction, the cell units include a plurality of battery modules spaced apart along the second direction, and the battery modules include any one of the battery modules described above. [Effects of the Invention]

[0012] The beneficial effects of the embodiments of the present application are as follows: The embodiments of the present application provide a battery module and a battery pack, the battery module including a cell assembly and a tray, the cell assembly including a plurality of cell subassemblies, the plurality of cell subassemblies being spaced apart along a first direction, each of the plurality of cell subassemblies including a plurality of cells, the plurality of cells being spaced apart along a second direction, the tray including a plurality of cell accommodating grooves spaced apart along the first direction, each cell accommodating groove corresponding to one of the cell subassemblies, and a coolant flow path being provided in a side wall of the cell accommodating groove. By providing the coolant flow path in the side wall of the cell accommodating groove, the coolant flow path and the tray are integrated into one unit, eliminating the need for a separate liquid cooling plate, further simplifying the structure, effectively improving the space utilization rate of the battery module, and reducing the manufacturing cost of the battery module. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a structural schematic diagram of a battery module according to an embodiment of the present application; [Figure 2] FIG. 2 is an exploded view of a battery module according to an embodiment of the present application. [Figure 3] FIG. 2 is a schematic cross-sectional view taken along line AA′ in FIG. [Figure 4] FIG. 1 is a plan view of a liquid cooling assembly according to an embodiment of the present application. [Figure 5] 1 is a cross-sectional schematic view of a cooling plate according to an embodiment of the present application. [Figure 6] 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application. [Figure 7] 1 is a plan cross-sectional view of a battery pack according to an embodiment of the present application; [Figure 8] 1 is a schematic cross-sectional view of a battery pack according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0014] In the description of this application, unless otherwise clearly specified and defined, the meaning of the terms "interconnect" and "connect" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, a mechanical connection, or an electrical connection, a direct connection or an indirect connection via an intermediate medium, or an internal communication between two components or an interactive relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0015] In this description, unless otherwise clearly specified and defined, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or may include contact between the first and second features via another feature between them rather than direct contact. Furthermore, a first feature being "above," "above," or "on top" of a second feature may include the first feature being directly above or diagonally above the second feature, or simply mean that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," or "below" of a second feature may include the first feature being directly below or diagonally below the second feature, or simply mean that the horizontal height of the first feature is lower than that of the second feature.

[0016] The embodiments of the present application provide a battery module and a battery pack. The following will describe each in detail. Note that the order of description of the embodiments below does not limit the preferred order of the embodiments.

[0017] 1 to 8, this embodiment provides a battery module, a battery pack, and a power consumption device, the battery module 1 including a cell assembly 10 and a tray 21, the cell assembly 10 including a plurality of cell subassemblies 11, the plurality of cell subassemblies 11 being spaced apart along a first direction X, the cell subassembly 11 including a plurality of cells 111, in any of the plurality of cell subassemblies 11, the plurality of cells 111 being spaced apart along a second direction Y, the tray 21 including a plurality of cell accommodating grooves 21A spaced apart along the first direction X, one cell accommodating groove 21A being arranged corresponding to one cell subassembly 11, and a coolant flow path 221 being provided on a sidewall of the cell accommodating groove 21A.

[0018] In addition, the packing technology for power battery packs commonly used in the industry is the moduleless battery (Cell To Pack: CTP) technology, which does not require structures such as end plates, side plates, or straps, thereby reducing costs and improving the cost performance of the product. However, power batteries can generate a lot of heat during the charging and discharging process, and in order to ensure the service life of the power battery, a cooling system must be installed to dissipate the heat from the battery module, which makes the system design complicated and expensive.

[0019] As can be seen, in this embodiment, by installing the coolant flow path 221 in the side wall of the cell accommodating groove 21A, the coolant flow path 221 and the tray 21 are integrated into one body, eliminating the need to install a separate liquid cooling plate, further simplifying the structure, effectively improving the space utilization rate of the battery module 1, and reducing the manufacturing cost of the battery module 1.

[0020] The technical solution of the present application will now be described with reference to specific examples.

[0021] In some embodiments, referring to FIGS. 1 and 2, FIG. 1 is a schematic diagram of a structure of a battery module according to an embodiment of the present application, and FIG. 2 is an exploded view of the battery module according to an embodiment of the present application.

[0022] This embodiment provides a battery module 1, which includes a cell assembly 10 and a tray 21, the cell assembly 10 including a plurality of cell subassemblies 11, the plurality of cell subassemblies 11 being spaced apart along a first direction X, the cell subassemblies 11 including a plurality of cells 111, in any one of the cell subassemblies 11, the plurality of cells 111 being spaced apart along a second direction Y, the tray 21 including a plurality of cell accommodating grooves 21A spaced apart in the first direction X, each cell accommodating groove 21A corresponding to one of the cell subassemblies 11, and a coolant flow path 221 provided in a sidewall of the cell accommodating groove 21A.

[0023] In some embodiments, the battery module 1 further includes current collectors 24 installed at both ends of the sidewall of the cell accommodating groove 21A and connecting members 23 installed between adjacent current collectors 24, with a liquid supply hole 24A formed in one of the current collectors 24 and a liquid drain hole 24B formed in the other of the current collectors 24. When the battery module 1 is in use, a coolant is injected into the coolant flow path 221, and the coolant circulates through the coolant flow path 221 via the liquid supply hole 24A and the liquid drain hole 24B, and the connecting members 23 include, but are not limited to, a bellows 231.

[0024] In the present application, the first direction is represented by X, and the second direction is represented by Y, and the first direction X and the second direction Y form a predetermined angle. In this embodiment, the present application will be described using an example in which the predetermined angle is a right angle.

[0025] In some embodiments, referring to Figures 2, 3, 4, and 5, Figure 3 is a cross-sectional schematic view taken along line AA' in Figure 1, Figure 4 is a plan view of a liquid cooling assembly according to an embodiment of the present application, and Figure 5 is a cross-sectional schematic view of a cooling plate according to an embodiment of the present application.

[0026] The tray 21 includes a bottom plate 211 and a plurality of cooling plates 22 located on the bottom plate 211, the plurality of cooling plates 22 being spaced apart along the first direction X, one cell accommodating groove 21A being located between adjacent cooling plates 22, the tray 21 and the cooling plates 22 being molded as a single unit, and the cooling plates 22 and the fluid collecting member 24 being fixed by welding, thereby simplifying the structure of the tray 21 and reducing costs.

[0027] In some embodiments, the cooling plate 22 includes a plurality of coolant flow paths 221 spaced apart in a third direction Z, the coolant flow paths 221 penetrate the cooling plate 22 along the second direction Y, and have a liquid supply port 221A and a liquid drain port 221B at both ends, the liquid supply port 221A communicating with the liquid supply hole 24A, and the liquid drain port 221B communicating with the liquid drain hole 24B.

[0028] In the present application, the third direction is represented by Z, and the third direction Z is set perpendicular to the first direction X, and the third direction Z is set perpendicular to the second direction Y.

[0029] Specifically, the battery module 1 includes a first current collector 241 and a second current collector 242, the first current collector 241 is provided with the liquid supply hole 24A, the second current collector 242 is provided with the liquid drain hole 24B, and the coolant flow path 221 has a liquid supply port 221A and a liquid drain port 221B at both ends, the liquid supply port 221A communicating with the first current collector 241, and the liquid drain port 221B communicating with the second current collector 242. Here, the coolant flow path 221 is preferably a linear flow path, and the coolant circulates in and out of the cooling plate 22 through the liquid supply hole 24A, the liquid supply port 221A, the coolant flow path 221, the liquid drain port 221B, and the liquid drain hole 24B.

[0030] As can be seen, in this embodiment, a coolant channel 221 is provided in the sidewall of the cell receiving groove 21A, i.e., in the cooling plate 22, thereby integrating the coolant channel 221 with the tray 21. A coolant is poured into the cooling plate 22, and the coolant circulates through the cooling plate 22 via the liquid supply hole 24A, the liquid supply port 221A, the coolant channel 221, the liquid drain port 221B, and the liquid drain port 24B. This achieves liquid-cooled heat dissipation for the cells 111 and eliminates the need for a separate liquid cooling plate as in the related art. This simplifies the structure, effectively improves the space utilization rate of the battery module 1, and reduces the manufacturing costs of the battery module 1.

[0031] In some embodiments, the cells 111 include a first side 111A located adjacent to the side wall of the cell accommodating groove 21A and a second side 111B located between adjacent cells 111, and the length of the first side 111A is greater than the length of the second side 111B. The battery module 1 further includes an insulating layer 12 and a thermally conductive structural adhesive 13, the insulating layer 12 being located between the second side 111B of adjacent cells 111, and the thermally conductive structural adhesive 13 being located between the side wall of the cell accommodating groove 21A and the cells 111, and the insulating layer 12 is preferably one or a combination of a fiber layer, an insulating foam, an insulating cotton, and a thermally conductive adhesive.

[0032] In some embodiments, the cells 111 are prismatic casing cells, and the cooling plate 22 has a straight structure to fit the first side 111A of the prismatic casing cells. As can be seen, in this embodiment, the insulating layer 12 is provided between adjacent cells 111 to improve the cooling efficiency of the cells 111. Furthermore, the thermally conductive structural adhesive 13 is provided between the cells 111 and the cooling plate 22 to tightly contact the cells 111 and the cooling plate 22, improving the sealing and rigidity of the liquid cooling assembly 20 and preventing the cells 111 from expanding and affecting the service life of the battery module 1. In some embodiments, the cells 111 are fixed to the tray 21 with a structural adhesive (not shown), which provides a simple and reliable connection and effectively prevents the cells 111 from loosening and falling off.

[0033] An explosion-proof valve 111C is installed on the side of the cell 111 closer to the bottom plate 211, and a plurality of pressure relief holes 210 are opened in the bottom plate 211, and the pressure relief holes 210 penetrate the bottom plate 211 along the thickness direction of the bottom plate, and one pressure relief hole 210 is installed corresponding to one explosion-proof valve 111C, and the end of the cell 111 where the explosion-proof valve 111C is installed is connected to the pressure relief hole 210.

[0034] Specifically, the cell 111 includes a thermal runaway nozzle installed corresponding to the explosion-proof valve 111C, and the explosion-proof valve 111C is attached to the thermal runaway nozzle. As can be understood, when thermal runaway occurs in a cell 111 in the tray 21, the chemicals and gases of the cell 111 are directionally ejected from the thermal runaway nozzle, and the thermal runaway nozzle of the cell 111 is aligned with the pressure relief hole 210, so that the chemicals and gases of the cell 111 are both directionally ejected into the pressure relief hole 210 and thus released to the outside of the battery module 1 through the pressure relief hole 210.

[0035] In some embodiments, referring to Figures 1, 4, 6 and 7, Figure 6 is a schematic diagram of the structure of a battery pack according to an embodiment of the present application, and Figure 7 is a plan cross-sectional view of a battery pack according to an embodiment of the present application.

[0036] This embodiment provides a battery pack 2, which includes a housing 2A and a plurality of cell units 2B, the housing 2A includes a bottom plate 2A1 and a plurality of side beams 2A2, the plurality of side beams 2A2 are fixedly installed on the edges of the bottom plate 2A1 to surround and form an accommodating cavity 2C, the plurality of cell units 2B are located in the accommodating cavity 2C, the plurality of cell units 2B are installed at intervals along the first direction X, and the cell units 2B include a plurality of battery modules 1 installed at intervals along the second direction Y, and the battery module 1 includes the battery module 1 described in any one of the above embodiments.

[0037] As can be understood, the battery module 1 has been described in detail in the above embodiments, and the description will not be repeated here.

[0038] In some embodiments, the side beams 2A2 are sequentially connected to form a plurality of annular structures 2D, each of which corresponds to a corresponding one of the battery modules 1, and each of the annular structures 2D is disposed to surround the corresponding one of the battery modules 1. Specifically, the bottom plate 2A1 and the side beams 2A2 form a plurality of receiving sub-cavities 2C1 for receiving the battery modules 1, and each of the receiving sub-cavities 2C1 is disposed to correspond to one of the battery modules 1.

[0039] In this embodiment, the battery pack 2 includes a first battery module 1A, a second battery module 1B, a third battery module 1C, and a fourth battery module 1D.

[0040] In some embodiments, in any of the battery modules 1, the plurality of cooling plates 22 include two first cooling plates 22A installed opposite each other along the first direction X, and a plurality of second cooling plates 22B installed at intervals between the two first cooling plates 22A, and the first cooling plate 22A includes an extension portion 22A1 extending from an end of the first cooling plate 22A in a direction away from the second cooling plate 22B, and the extension portion 22A1 is fixedly connected to the side beam 2A2.

[0041] Specifically, the extension portion 22A1 includes a plurality of first apertures 22A11 spaced apart along the second direction Y, and the side beam 2A2 includes a plurality of second apertures spaced apart along the second direction Y, the first apertures 22A11 corresponding one-to-one to the second apertures (not shown), and the extension portion 22A1 and the side beam 2A2 are screw-connected.

[0042] As can be seen, in this embodiment, the first cooling plate 22A includes an extension portion 22A1 that extends from the end of the first cooling plate 22A in a direction away from the second cooling plate 22B and is fixedly connected to the side beam 2A2, thereby restricting the position of the battery module 1 and preventing the battery module 1 from rattling when the battery pack 2 is subjected to an external impact, thereby improving the stability of the battery pack 2; and by screwing the extension portion 22A1 and the side beam 2A2 together, the battery module 1 can be easily attached, detached, and maintained.

[0043] In some embodiments, the housing 2A further includes a drainage pipe 2A4 located between the adjacent cell units 2B and two liquid supply pipes 2A3 arranged opposite to each other along the first direction X, the liquid supply pipe 2A3 being located on a side of the battery module 1 away from the drainage pipe 2A4, the liquid drainage pipe 2A4 being provided with a plurality of drainage openings 2A41 arranged in sequence along the second direction Y, and the liquid supply pipe 2A3 being provided with a plurality of openings 2A41 arranged in sequence along the second direction Y. In any one of the battery modules 1, one of the liquid supply openings 2A31 is provided corresponding to one of the first cooling plates 22A, and the liquid supply opening 2A31 is connected to the liquid supply hole 24A of the current collector 24 corresponding to the first cooling plate 22A, and one of the liquid drain openings 2A41 is provided corresponding to the other of the first cooling plates 22A, and the liquid drain opening 2A41 is connected to the liquid drain hole 24B of the current collector 24 corresponding to the first cooling plate 22A.

[0044] Specifically, the liquid supply line 2A3 includes a liquid supply pipe port 2A32, and the liquid drain line 2A4 includes a liquid drain pipe port 2A42 connected to an external device (not shown), and the liquid drain pipe port 2A42 is connected to an external device, where the external device is conventional technology, and can supply cooling liquid to the liquid cooling assembly 20 and also recover cooling liquid that has flowed out of the liquid cooling assembly 20.

[0045] In some embodiments, the coolant enters the cooling plate 22 through the liquid supply pipe port 2A32, circulates through the liquid supply hole 24A and the liquid drain hole 24B, and returns to the external device through the liquid drain port 2A42. Here, in the first battery module 1A, the flow direction of the coolant is a1 → b1 → c1 → d1 → e1; in the second battery module 1B, the flow direction of the coolant is a1 → b2 → c2 → d2 → e2; in the third battery module 1C, the flow direction of the coolant is a2 → b3 → c3 → d3 → e2; and in the fourth battery module 1D, the flow direction of the coolant is a2 → b4 → c4 → d4 → e2.

[0046] As can be seen, in this embodiment, the housing 2A further includes a drainage pipe 2A4 located between adjacent cell units 2B and two liquid supply pipes 2A3 installed opposite each other in the first direction X, thereby simplifying the structure, reducing the installation space, facilitating installation and maintenance, and reducing costs. Furthermore, the coolant flows in from both sides of the housing 2A and then flows out between the adjacent cell units 2B, reducing the flow resistance of the coolant supply within the liquid cooling assembly 20 and improving the heat dissipation effect of the cooling plate 22. Furthermore, by installing the drainage pipe 2A4 between the two cell units 2B, the coolant flows from the liquid supply pipes 2A3 on both sides into the cooling plate 22 of each module and is collected in the central drainage pipe 2A4, allowing for return flow using only one drainage pipe 2A4, saving space. The method of collecting the coolant from both sides to the middle improves the uniformity of heat dissipation.

[0047] In some embodiments, referring to Figures 3, 6, 7 and 8, Figure 8 is a cross-sectional schematic view of a battery pack according to an embodiment of the present application.

[0048] A pressure relief passage 2E is formed between the tray 21, the bottom plate 2A1 and the side beams 2A2, and the pressure relief holes 210 are connected to the pressure relief passage 2E. Specifically, the diameter of the pressure relief holes 210 is smaller than the diameter of the cells 111. The design of the pressure relief passage 2E reduces the impact caused by the rupture of the cells 111 and improves the operational safety of the battery module 1. At the same time, the pressure relief holes 210 allow gas generated by the heat of the cells 111 or battery thermal runaway to be quickly discharged from the bottom of the cells 111, improving the heat dissipation effect and improving the structural safety of the battery pack 2. This reduces the gas pressure inside the battery pack 2 and prevents the gas generated by the battery cells 111 from entering the accommodating chamber 2C, thereby ensuring that the temperature of the accommodating cavity 2C does not rise suddenly.

[0049] The housing 2A is made of metal, and the tray 21 is made of plastic or other insulating materials, which can prevent the bottom of the cell 111 from contacting the bottom plate 2A1 and serve as insulating protection. A mica plate can be further installed between the tray 21 and the bottom plate 2A1 to cover the pressure relief hole 210, so that the chemicals or gases sprayed from the cell 111 are first sprayed onto the mica plate, and the housing 2A is prevented from being burned off.

[0050] This embodiment provides a power consumption device including the battery module according to any one of the above embodiments.

[0051] As can be understood, the battery module has been described in detail in the above embodiments, and the description will not be repeated here.

[0052] The power consumption device includes a battery module for use as a power supply for the power consumption device, and therefore the power consumption device also includes the advantages of the battery module, thereby helping to simplify the overall structure of the power consumption device, wherein the power consumption device may be an automobile, an aircraft, a mechanical production equipment, etc. [Explanation of symbols]

[0053] 1 Battery Module 10 Cell Assembly 20 Liquid Cooling Assembly 11 Cell Sub-Assembly 12 Insulation layer 13 Thermally conductive structural adhesive 111 cells 111A 1st side 111B 2nd side 111C Explosion-proof valve 21 Tray 22 Cooling plate 23 Connecting member 24 Current collector 21A Cell storage groove 211 Bottom plate 231 Bellows 241 First current collector 242 Second current collector 210 Pressure relief hole 221 Coolant flow path 221A Liquid supply port 221B drain port 24A liquid supply hole 24B Drainage hole 2 battery packs 2A housing 2B cell unit 2C Containment Cavity 2D circular structure 2E Pressure relief passage 2A1 Bottom plate 2A2 Side Beam 2A3 Liquid supply line 2A4 Drainage pipe 2C1 Containment Sub-Cavity 2A31 Liquid supply opening 2A32 Liquid supply pipe port 2A41 Drainage opening 2A42 Drain port 1A 1st battery module 1B Second battery module 1C 3rd battery module 1D fourth battery module 22A 1st cooling plate 22B 2nd cooling plate 22A1 Extension part 22A11 1st hole

Claims

1. A battery pack, a housing including a bottom plate and a plurality of side beams fixedly installed on the edge of the bottom plate to surround and form a receiving cavity; a plurality of cell units located within the accommodating cavity and spaced apart along a first direction; The cell unit includes a plurality of battery modules spaced apart along a second direction, the battery modules including: a cell assembly including a plurality of cell subassemblies spaced apart along the first direction, each of the cell subassemblies including a plurality of cells, and in any of the plurality of cell subassemblies, a plurality of the cells are spaced apart along the second direction; a tray including a plurality of cell accommodating grooves spaced apart in the first direction, each cell accommodating groove corresponding to one of the cell subassemblies, and a coolant flow path disposed within a sidewall of the cell accommodating groove; In any of the plurality of battery modules, the plurality of cooling plates include two first cooling plates installed opposite each other along the first direction and a plurality of second cooling plates positioned between the two first cooling plates, the first cooling plate includes an extension portion extending from an end of the first cooling plate in a direction away from the second cooling plate, the extension portion being fixedly connected to the side beam; Battery pack.

2. the housing further includes a drainage pipe located between the adjacent cell units and two liquid supply pipes installed opposite each other along the first direction, the liquid supply pipes being located on a side of the battery module away from the drainage pipes, the liquid drainage pipes being provided with a plurality of drainage openings arranged sequentially along the second direction, and the liquid supply pipes being provided with a plurality of liquid supply openings arranged sequentially along the second direction; In any of the plurality of battery modules, one of the liquid supply openings is provided corresponding to one of the two first cooling plates, and the liquid supply opening is connected to a liquid supply hole of a liquid concentrating member corresponding to the one of the first cooling plates, and one of the liquid drain openings is provided corresponding to the other of the two first cooling plates, and the liquid drain opening is connected to a liquid drain hole of a liquid concentrating member corresponding to the other of the two first cooling plates. The battery pack according to claim 1 .

3. An explosion-proof valve is installed on the side of the cell close to the bottom plate, and a plurality of pressure relief holes are opened in the bottom plate, the pressure relief holes penetrate the bottom plate, and one of the pressure relief holes is installed corresponding to one of the explosion-proof valves, A pressure relief passage is formed between the tray, the bottom plate and the side beams, and the pressure relief hole is in communication with the pressure relief passage. The battery pack according to claim 1 .

4. 4. The battery pack according to claim 3, wherein the pressure relief hole has a diameter smaller than the diameter of the cell. 。

5. An explosion-proof valve is installed on a side of the cell close to the bottom plate, and a plurality of pressure relief holes are opened in the bottom plate, the pressure relief holes penetrate the bottom plate, and each pressure relief hole is installed corresponding to one of the explosion-proof valves; The battery pack according to claim 1 , wherein the end of the cell where the explosion-proof valve is installed communicates with the pressure relief hole.

6. The battery module further includes a liquid concentrating member installed on both ends of the side wall of the cell accommodating groove, the liquid concentrating member including a plurality of sub-liquid concentrating members, and a connecting member installed between adjacent sub-liquid concentrating members at either end of the side wall of the cell accommodating groove, wherein a liquid supply hole is installed in one of the liquid concentrating members and a liquid drainage hole is installed in the other of the liquid concentrating members. The battery pack according to claim 1 .

7. The tray includes a bottom plate and a plurality of cooling plates located on the bottom plate, the plurality of cooling plates are installed at intervals along the first direction, one of the cell accommodating grooves is located between adjacent cooling plates, and the bottom plate is integrally molded with the cooling plates. The battery pack according to claim 6.

8. The cooling plate includes a plurality of the cooling liquid flow paths spaced apart along a third direction, the cooling liquid flow paths passing through the cooling plate along the second direction; The cooling liquid flow path has a liquid supply port communicating with the liquid supply hole and a liquid drain port communicating with the liquid drain hole at both ends thereof. The battery pack according to claim 7.

9. The battery module includes a first liquid concentration member and a second liquid concentration member, the first liquid concentration member has the liquid supply hole, the second liquid concentration member has the liquid drain hole, the liquid supply port is connected to the first liquid concentration member, the liquid drain port is connected to the second liquid concentration member, and the cooling liquid flow path is a straight passage. The battery pack according to claim 8.

10. An explosion-proof valve is installed on the side of the cell close to the bottom plate, and a plurality of pressure relief holes are opened in the bottom plate, the pressure relief holes penetrate the bottom plate, and one of the pressure relief holes is installed corresponding to one of the explosion-proof valves. The battery pack according to claim 7.

11. The cell includes a first side surface installed adjacent to a side wall of the cell receiving groove and a second side surface located between adjacent cells, the length of the first side surface being greater than the length of the second side surface; the battery module further includes a heat insulating layer and a thermally conductive structural adhesive, the heat insulating layer being positioned between the second side surfaces of the adjacent cells, and the thermally conductive structural adhesive being positioned between the sidewalls of the cell receiving grooves and the cells; The battery pack according to claim 1 .

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