Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a single battery and a battery pack. The battery monomer comprises a battery cell, a shell, an anti-explosion valve and a first bracket, the battery cell is arranged in the shell, and an anti-explosion valve is arranged at the bottom of the shell. The first bracket is arranged in the shell, and the battery cell is arranged on the first bracket; a first through hole is formed in the first support, a containing space is defined by the first support and the bottom of the shell, the anti-explosion valve is located in the containing space, and the first through hole is communicated with the containing space; therefore, gas generated by the battery cell can flow into the accommodating space through the first through hole. The stability and the reliability of the single battery are improved, so that the anti-explosion valve can be normally opened, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery pack. Background Art

[0002] In the prior art, the explosion-proof valves of some battery cells are arranged at the bottom of the housing, so as to improve the safety performance of the battery module. However, in the prior art, the battery cells in the battery cell are usually directly connected to the bottom of the housing, so that the explosion-proof valves are easily squeezed or touched and fail during the assembly and use of the battery cells; at the same time, the battery cells are directly in contact with the explosion-proof valves, so that when the battery cells are out of thermal control, the explosion-proof valves may not be able to open normally, thereby increasing potential safety hazards.

[0003] Therefore, it is urgent to design a battery cell and a battery pack to solve the above technical problems. Summary of the Utility Model

[0004] The first object of the utility model is to provide a battery cell, which improves the stability and reliability of the battery cell, enables the explosion-proof valve to open normally, and reduces potential safety hazards.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a battery cell, including:

[0007] A battery cell;

[0008] A housing, the battery cell is arranged in the housing, and an explosion-proof valve is arranged at the bottom of the housing;

[0009] A first bracket, the first bracket is arranged in the housing, and the battery cell is arranged on the first bracket; the first bracket and the bottom of the housing enclose a containing space, the explosion-proof valve is located in the containing space, and the first bracket is provided with a first through hole, and the first through hole is communicated with the containing space.

[0010] As an optional technical solution of the battery cell, the first bracket includes a first supporting portion and a second supporting portion, the first supporting portion is connected to the second supporting portion, the first supporting portion is provided with the first through hole, the battery cell is arranged on the first supporting portion, and the side of the second supporting portion away from the first supporting portion is connected to the bottom of the housing.

[0011] As an optional technical solution of the battery cell, the first through holes are provided in plurality, and the plurality of first through holes are arranged at intervals.

[0012] As an alternative technical solution of the battery cell, along the height direction of the battery cell, the projection of the battery cell overlaps with the projection of the first through hole.

[0013] As an alternative technical solution of the battery cell, the second support portion is provided with a second through hole, a gap is defined by the side wall of the housing and the first bracket, and the second through hole is configured to communicate the accommodation space with the gap.

[0014] As an alternative technical solution of the battery cell, the second support portion is provided with a second through hole, the second support portion has an inner surface and an outer surface, the side wall of the housing contacts the outer surface of the second support portion, the inner surface of the second support portion is located in the accommodation space, and the second through hole penetrates through the inner surface and the outer surface of the second support portion.

[0015] As an alternative technical solution of the battery cell, a plurality of the second through holes are provided, and the plurality of second through holes are spaced apart.

[0016] As an alternative technical solution of the battery cell, the battery cell further includes a second bracket and a cover plate assembly. The second bracket is disposed on the top of the battery cell and is located inside the housing; the cover plate assembly is disposed on the second bracket, and an opening is formed on one side of the housing close to the top of the battery cell, and the cover plate assembly covers the opening of the housing.

[0017] As an alternative technical solution of the battery cell, the cover plate assembly includes a positive electrode post and a negative electrode post. Both the positive electrode post and the negative electrode post are connected to the battery cell. A convex portion is protruded from the second bracket toward the battery cell, and the convex portion is located between the positive electrode post and the negative electrode post.

[0018] As an alternative technical solution of the battery cell, the height of the convex portion is not less than 0.2 mm.

[0019] The second object of the present invention is to provide a battery pack, which has high reliability and stability, can improve its safety performance, and reduce potential safety hazards.

[0020] To achieve this object, the present invention adopts the following technical solutions:

[0021] The present invention provides a battery pack, including a battery module and a liquid cooling plate. The liquid cooling plate is connected to the side surface of the battery module, and the battery module includes a plurality of the above-mentioned battery cells.

[0022] As an alternative technical solution of a battery pack, the housing has a first surface and a second surface, the first surface and the second surface are adjacent to each other, the area of the first surface is larger than that of the second surface, the second surfaces of two adjacent housings are connected to each other, and the liquid cooling plate is connected to the first surface of the housing.

[0023] The beneficial effects of the present utility model at least include:

[0024] The present utility model provides a battery cell, which includes a battery core, a housing, an explosion-proof valve and a first bracket. Among them, the battery core is arranged in the housing, and an explosion-proof valve is arranged at the bottom of the housing. The first bracket is arranged in the housing, and the battery core is arranged on the first bracket; the first bracket is provided with a first through hole, and the first bracket and the bottom of the housing enclose a containing space, the explosion-proof valve is located in the containing space, and the first through hole is communicated with the containing space; so that the gas generated by the battery core can flow into the containing space through the first through hole. Through the arrangement of the first bracket, the battery core and the explosion-proof valve at the bottom of the housing will not be in direct contact, thereby avoiding phenomena such as extrusion and touch between the battery core and the explosion-proof valve during the assembly of the battery cell, ensuring that the explosion-proof valve can work normally, and improving the stability and reliability of the battery cell. At the same time, the first bracket and the bottom of the housing enclose a containing space, so that the high-temperature and high-pressure gas generated when the battery core undergoes thermal runaway can gather in the containing space, and when the gas reaches a certain pressure, the explosion-proof valve is triggered to open and release pressure. It solves the problem in the prior art that the battery core is in direct contact with the explosion-proof valve, resulting in the explosion-proof valve being unable to accurately sense the pressure value of the gas and thus unable to open the explosion-proof valve in time. The structural design of the battery cell in the present utility model can improve its safety performance and save costs.

[0025] The present utility model provides a battery pack, which has high reliability and stability, can improve its safety performance, and reduce potential safety hazards. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0027] Figure 1 is a schematic structural diagram of the battery cell provided by the embodiment of the present utility model;

[0028] Figure 2 is a schematic structural diagram of the battery module provided by the embodiment of the present utility model.

[0029] Reference Signs

[0030] 10. Battery cell; 20. Battery module; 21. Liquid cooling plate;

[0031] 100. Electric core;

[0032] 200. Housing; 210. Explosion-proof valve;

[0033] 300. First bracket; 310. First support portion; 320. Second support portion; 330. First through hole; 340. Second through hole; 350. Accommodating space;

[0034] 400. Second bracket; 410. Protrusion;

[0035] 500. Cover assembly; 510. Positive electrode post; 520. Negative electrode post; 530. Positive current collector; 540. Negative current collector. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0038] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is habitually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0040] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0042] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0043] This embodiment provides a battery cell, which has high stability and reliability, can reduce the problem of explosion-proof valve failure during the assembly of the battery cell, and the explosion-proof valve can be normally opened during thermal runaway, reducing potential safety hazards.

[0044] As Figure 1As shown, the battery cell 10 mainly includes a battery core 100, a housing 200, an explosion-proof valve 210, and a first bracket 300. Among them, the battery core 100 is disposed inside the housing 200, and the explosion-proof valve 210 is disposed at the bottom of the housing 200. The first bracket 300 is disposed inside the housing 200, and the battery core 100 is disposed on the first bracket 300; the first bracket 300 is provided with a first through hole 330, and the first bracket 300 and the bottom of the housing 200 enclose a containing space 350, and the explosion-proof valve 210 is located inside the containing space 350, and the first through hole 330 communicates with the containing space 350; so that the gas generated by the battery core 100 can flow into the containing space 350 through the first through hole 330.

[0045] Based on the above design, in this embodiment, the battery core 100 can be set in a rectangular shape or the like. The explosion-proof valve 210 is disposed at the bottom of the housing 200, so that when the battery core 100 undergoes thermal runaway, the high-temperature and high-pressure gas generated by the battery core 100 can be discharged from the bottom of the battery cell 10 through the explosion-proof valve 210, thereby preventing the high-temperature and high-pressure gas from damaging electronic components such as the pole column and pole ear at the top of the battery cell 10, achieving the purpose of electrical separation, and improving the safety of the battery cell 10.

[0046] In this embodiment, the first bracket 300 is located at the bottom of the housing 200, and the battery core 100 is disposed on the first bracket 300. On the one hand, the first bracket 300 can play a certain supporting role for the battery core 100. On the other hand, the first bracket 300 and the bottom of the housing 200 enclose a containing space 350, and the first bracket 300 is provided with a first through hole 330. Thus, when the battery core 100 undergoes thermal runaway, the high-temperature and high-pressure gas generated by the battery core 100 can flow into the containing space 350 through the first through hole 330. When the gas in the containing space 350 reaches a certain pressure, the explosion-proof valve 210 is opened to achieve a pressure relief function, avoiding the risk of thermal runaway spread or even explosion of the battery cell 10, and improving the safety performance.

[0047] The arrangement of the first bracket 300 enables the battery cell 100 not to directly contact the explosion-proof valve 210 at the bottom of the housing 200, thereby avoiding phenomena such as extrusion and contact between the battery cell 100 and the explosion-proof valve 210 during the assembly of the battery module 10, ensuring that the explosion-proof valve 210 can work properly, and improving the stability and reliability of the battery module 10. At the same time, the first bracket 300 and the bottom of the housing 200 enclose a receiving space 350, so that the high-temperature and high-pressure gas generated when the battery cell 100 undergoes thermal runaway can accumulate in the receiving space 350, and when the gas reaches a certain pressure, the explosion-proof valve 210 is triggered to open and release pressure. This solves the problem in the prior art that the battery cell 100 directly contacts the explosion-proof valve 210, resulting in the explosion-proof valve 210 being unable to accurately sense the pressure value of the gas and thus unable to open the explosion-proof valve 210 in a timely manner. The structural design of the battery module 10 in this embodiment can improve its safety performance and save costs.

[0048] Optionally, the first bracket 300 in this embodiment can be processed and made of PP insulating plastic material, which reduces the weight of the battery module 10, is easy to assemble, and saves costs.

[0049] As Figure 1 shown, in this embodiment, the first bracket 300 includes a first support portion 310 and a second support portion 320. The first support portion 310 is connected to the second support portion 320. The first support portion 310 is provided with a first through hole 330. The battery cell 100 is disposed on the first support portion 310. The side of the second support portion 320 away from the first support portion 310 is connected to the bottom of the housing 200.

[0050] Optionally, the first support portion 310 and the second support portion 320 in this embodiment are integrally formed, which improves the stability and strength of the first bracket 300. The first support portion 310 is used to support the battery cell 100, and the second support portion 320 can keep a certain distance between the first support portion 310 and the bottom of the housing 200, thus facilitating the formation of the receiving space 350.

[0051] Optionally, the height of the second support portion 320 in this embodiment can be set to values such as 2 mm, 3 mm, 4 mm, etc.

[0052] As Figure 1 shown, in this embodiment, the first through holes 330 are provided in plurality, and the plurality of first through holes 330 are spaced apart. Exemplarily, the number of the first through holes 330 in this embodiment can be set to values such as five, ten, fifteen, etc. When the battery cell 100 undergoes thermal runaway, the gas can flow into the receiving space 350 from the first through holes 330 in a timely manner, improving the safety of the battery module 10.

[0053] Optionally, in this embodiment, along the height direction of the battery cell 100, the projection of the battery cell 100 overlaps with the projection of the first through hole 330. This enables each first through hole 330 to be covered by the bottom of the battery cell 100, improving the utilization rate of the first through hole 330. When the battery cell 100 undergoes thermal runaway, gas can be discharged from the first through hole 330 in a timely manner, enhancing the safety of the battery module 10.

[0054] As Figure 1 shown, in this embodiment, the second support portion 320 is provided with a second through hole 340. One end of the second through hole 340 communicates with the accommodation space 350, and the other end of the second through hole 340 is in thermal communication with the housing 200. This allows the high-temperature and high-pressure gas in the accommodation space 350 to conduct heat through the second through hole 340 to the housing 200. Since a liquid cooling plate 21 is usually provided on the outer wall of the housing 200, the heat of the gas can be transferred to the liquid cooling plate 21, thereby enabling the liquid cooling plate 21 to cool the gas, that is, realizing the cooling effect on the battery module 10, avoiding the spread of thermal runaway of the battery module 10, and improving the safety and stability of the battery module 10.

[0055] Optionally, in some embodiments, the second support portion 320 is provided with a second through hole 340. The second support portion 320 has an inner surface and an outer surface. The side wall of the housing 200 contacts the outer surface of the second support portion 320, and the inner surface of the second support portion 320 is located in the accommodation space 350. The second through hole 340 penetrates through the inner surface and the outer surface of the second support portion 320. That is to say, the outer surface of the second support portion 320 directly contacts the side wall of the housing 200, so that the high-temperature gas can quickly exchange heat with the side wall of the housing 200 through the second through hole 340, improving the heat exchange efficiency.

[0056] Optionally, in some embodiments, a gap is formed between the side wall of the housing 200 and the first bracket 300. The second through hole 340 is configured to communicate the accommodation space 350 with the gap. In this way, the high-temperature gas flowing through the second through hole 340 can accumulate in the gap and then exchange heat with the side wall of the housing 200. This structural design is beneficial to the assembly of the first bracket 300 and the housing 200, avoiding interference between the two, and improving the assembly efficiency.

[0057] Optionally, the second through holes 340 in this embodiment can be provided in multiple numbers and are spaced apart from each other. This can improve the efficiency of the high-temperature and high-pressure gas flowing to the housing 200 and then being cooled and heat-exchanged by the liquid cooling plate 21, improve the safety performance of the battery module 10, and reduce or avoid the spread of thermal runaway of the battery module 10.

[0058] As Figure 1As shown in the figure, the battery cell 10 in this embodiment further includes a second bracket 400 and a cover plate assembly 500. The second bracket 400 is disposed on the top of the battery cell 100 and is located inside the housing 200; the cover plate assembly 500 is disposed on the second bracket 400 and covers the opening of the housing 200.

[0059] The arrangement of the second bracket 400 can provide a certain supporting effect on the cover plate assembly 500, improving the stability and reliability of the battery cell 10. At the same time, the second bracket 400 and the first bracket 300 cooperate to play a certain role in fixing and protecting the battery cell 100, preventing the battery cell 100 from shaking up and down inside the housing 200, avoiding the contact between the tab and the positive and negative plates of the battery cell 100 and the housing 200, and preventing the occurrence of a short circuit.

[0060] Optionally, the second bracket 400 in this embodiment can be processed and made of PP insulating plastic material, reducing the weight of the battery cell 10, being easy to assemble, and saving costs.

[0061] As Figure 1 shown in the figure, in this embodiment, the cover plate assembly 500 includes a positive electrode post 510 and a negative electrode post 520. Both the positive electrode post 510 and the negative electrode post 520 are connected to the battery cell 100. The second bracket 400 protrudes with a protrusion 410 in the direction towards the battery cell 100. The protrusion 410 is located between the positive electrode post 510 and the negative electrode post 520. The positive electrode post 510 is connected to the battery cell 100 through a positive current collector 530, and the negative electrode post 520 is connected to the battery cell 100 through a negative current collector 540. The arrangement of the protrusion 410 can prevent the risk of short - circuit overlap between the positive current collector 530 and the negative current collector 540, improving the safety performance of the battery cell 10.

[0062] Optionally, the height dimension of the protrusion 410 in this embodiment can be set to 0.2 mm, 0.3 mm, 0.4 mm, etc.

[0063] Optionally, the battery cell 100 in this embodiment adopts a multi - cell - pack parallel structure, and the number of cell packs is not less than two.

[0064] Optionally, the dimensional relationship of the length L, height H, and thickness T of the battery cell 100 in this embodiment can be set as follows: battery cell 100 length L / battery cell 100 thickness T ≥ 0.5, battery cell 100 length L / battery cell 100 height H ≤ 1.5, battery cell 100 thickness T / battery cell 100 height H ≥ 0.6.

[0065] As Figure 2 shown in the figure, this embodiment further provides a battery pack. The battery pack includes a battery module 20 and a liquid - cooling plate 21. The liquid - cooling plate 21 is connected to the side of the battery module 20, and the battery module 20 includes more than one battery cell 10.

[0066] Specifically, the housing 200 has a first surface and a second surface. The first surface and the second surface are adjacent to each other, and the area of the first surface is larger than that of the second surface. The second surfaces of the housings 200 of two adjacent battery cells 10 are connected to each other, and the liquid cooling plate 21 is connected to the first surface of the housing 200.

[0067] It can be understood that in this embodiment, the first surface is the large surface of the housing 200, and the second surface is the narrow surface of the housing 200.

[0068] Optionally, in this embodiment, the liquid cooling plate 21 is bonded to the side surface (i.e., the first surface) of the housing 200 by using thermal conductive adhesive or structural adhesive, so as to achieve the purpose of heat exchange between the liquid cooling plate 21 and the housing 200. Preferably, the liquid cooling plate 21 is bonded to two opposite side surfaces (i.e., the first surface) of the housing 200 to increase the heat exchange area and improve the heat exchange efficiency.

[0069] Since the battery pack has the above-mentioned battery module 20, the reliability and stability of the battery pack are high, its safety performance can be improved, and potential safety hazards can be reduced.

[0070] Obviously, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

[0071] Note that in the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations 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 a suitable manner in any one or more embodiments or examples.

Claims

1. A battery cell, characterized in that: include: Battery cell (100); A housing (200), the battery cell (100) being arranged in the housing (200), and an explosion-proof valve (210) being arranged at the bottom of the housing (200); A first bracket (300), wherein the first bracket (300) is arranged in the shell (200), and the battery cell (100) is arranged on the first bracket (300); the first bracket (300) and the bottom of the shell (200) are arranged to form a receiving space (350), the explosion-proof valve (210) is located in the receiving space (350), and the first bracket (300) is provided with a first through hole (330), and the first through hole (330) is connected to the receiving space (350).

2. The battery cell according to claim 1, characterized in that: The first bracket (300) comprises a first supporting portion (310) and a second supporting portion (320), the first supporting portion (310) being connected to the second supporting portion (320), the first supporting portion (310) being provided with the first through hole (330), the battery cell (100) being arranged on the first supporting portion (310), and the second supporting portion (320) being connected to the bottom of the shell (200) at a side away from the first supporting portion (310).

3. The battery cell according to claim 2, characterized in that: The first through holes (330) are arranged in plurality, and the plurality of first through holes (330) are arranged at intervals.

4. The battery cell according to claim 2, characterized in that: Along the height direction of the battery core (100), the projection of the battery core (100) overlaps with the projection of the first through hole (330).

5. The battery cell according to claim 2, characterized in that: The second supporting portion (320) is provided with a second through hole (340), the side wall of the shell (200) and the first bracket (300) are arranged to form a gap, and the second through hole (340) is configured to connect the accommodating space (350) and the gap.

6. The battery cell according to claim 2, characterized in that: The second support portion (320) is provided with a second through hole (340), and the second support portion (320) has an inner surface and an outer surface. The side wall of the shell (200) is in contact with the outer surface of the second support portion (320), and the inner surface of the second support portion (320) is located in the accommodating space (350). The second through hole (340) passes through the inner surface and the outer surface of the second support portion (320).

7. The battery cell according to claim 5, characterized in that: The second through holes (340) are arranged in plurality, and the plurality of second through holes (340) are arranged at intervals.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The battery cell (10) further comprises a second bracket (400) and a cover plate assembly (500), wherein the second bracket (400) is arranged on the top of the battery cell (100), and the second bracket (400) is located in the shell (200); the cover plate assembly (500) is arranged on the second bracket (400), and the shell (200) has an opening on one side close to the top of the battery cell (100), and the cover plate assembly (500) covers the opening of the shell (200).

9. The battery cell according to claim 8, characterized in that: The cover plate assembly (500) comprises a positive electrode column (510) and a negative electrode column (520), wherein the positive electrode column (510) and the negative electrode column (520) are both connected to the battery cell (100), and the second bracket (400) is provided with a protrusion (410) protruding in the direction of the battery cell (100), and the protrusion (410) is located between the positive electrode column (510) and the negative electrode column (520).

10. The battery cell according to claim 9, characterized in that: The height of the protrusion (410) is not less than 0.2 mm.

11. A battery pack, characterized in that: The invention comprises a battery module (20) and a liquid cooling plate (21), wherein the liquid cooling plate (21) is connected to a side surface of the battery module (20), and the battery module (20) comprises a plurality of battery cells (10) according to any one of claims 1 to 10.

12. The battery pack according to claim 11, characterized in that: The shell (200) has a first surface and a second surface, the first surface and the second surface are adjacent to each other, the area of ​​the first surface is greater than the area of ​​the second surface, the second surfaces of two adjacent shells (200) are connected to each other, and the liquid cooling plate (21) is connected to the first surface of the shell (200).

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