Battery pack

Abstract

The utility model relates to the field of batteries, in particular to a battery pack. The battery pack comprises a battery cell and a liquid cooling device, wherein the liquid cooling device comprises a collector plate and a plurality of liquid cooling plates; the battery cells are arranged between the adjacent liquid cooling plates, the multiple liquid cooling plates are arranged at intervals in the preset direction, first cavities are formed in the liquid cooling plates, and the two ends, in the length direction, of the liquid cooling plates are the first ends and the second ends correspondingly; the current collecting plate comprises a plurality of main body parts and a plurality of current collecting parts, second cavities are formed in the current collecting parts, the first ends of the plurality of liquid cooling plates are connected with the plurality of main body parts in a one-to-one correspondence manner, and the first cavities are communicated with the second cavities through the main body parts; a flow collecting part is connected between every two adjacent main body parts, and the flow collecting parts are configured to bend and extend in the preset direction. The current collecting parts are arranged in a bent mode so that deformation allowance can be provided in the preset direction to achieve extension and retraction, when the current collecting plates and a plurality of liquid cooling plates are assembled, the position of each main body part has variable quantity so as to adapt to the position tolerance of each current collecting plate, and rapid assembly is achieved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery pack. Background Art

[0002] Battery pack technology continues to develop, and a variety of solutions have emerged to improve the thermal management efficiency of battery packs. Among them, the battery liquid cooling solution is an effective solution. It usually arranges multiple liquid cooling plates, and configures each liquid cooling plate to fit with two adjacent groups of batteries. In order to realize the supply of coolant in multiple liquid cooling plates, each liquid cooling plate is connected by a pipe. For example, the patent application with publication number CN116130834A discloses an immersion liquid-cooled energy storage battery pack structure, including a branch pipeline, a liquid inlet pipeline, a liquid storage pipeline and a liquid cooling plate. The liquid inlet pipeline, the liquid outlet pipeline, the branch pipeline and the liquid cooling plate together form a cooling pipeline system to increase the heat exchange efficiency.

[0003] However, this solution of connecting each liquid cooling plate through pipes requires that a pipe be plugged in between every two adjacent liquid cooling plates; and due to the length tolerance between each liquid cooling plate, the pipe may not be tightly connected to some liquid cooling plates, which seriously restricts the overall production efficiency of the battery pack. Utility Model Content

[0004] The purpose of the present application is to provide a battery pack to solve, to a certain extent, the technical problem in the prior art that the solution of connecting various liquid cooling plates through pipelines seriously restricts the production efficiency of the battery pack.

[0005] The present application provides a battery pack, including a battery cell and a liquid cooling device, wherein the liquid cooling device includes a current collecting plate and a plurality of liquid cooling plates, and a battery cell is arranged between each two adjacent liquid cooling plates;

[0006] The plurality of liquid cooling plates are arranged at intervals along a predetermined direction, a first cavity is provided inside the liquid cooling plate, and two ends of the liquid cooling plate in the length direction are respectively a first end and a second end; wherein the predetermined direction intersects with the length direction;

[0007] The current collecting plate includes a plurality of main bodies and a plurality of current collecting parts, a second cavity is arranged inside the current collecting part, the first ends of the plurality of liquid cooling plates are connected to the plurality of main bodies in a one-to-one correspondence, and the first cavity and the second cavity are communicated with each other through the main body;

[0008] A current collecting portion is connected between every two adjacent main body portions, and the current collecting portion is bent and extended along the predetermined direction.

[0009] In the above technical solution, further, the current collecting part includes a telescopic part, and the telescopic part is curved so that the current collecting part can be telescoped along the predetermined direction.

[0010] In any of the above technical solutions, further, the current collecting part also includes a current collecting body part, the current collecting body part is in a flat plate shape, and both ends of the telescopic part in the predetermined direction are connected to the main body part through the current collecting body part.

[0011] In any of the above technical solutions, further, the collecting part is integrally connected to the main body.

[0012] In any of the above technical solutions, further, the thickness of the collecting portion is smaller than the thickness of the main body portion.

[0013] In any of the above technical solutions, further, the main body is plugged into the first end of the liquid cooling plate.

[0014] In any of the above technical solutions, further, a third cavity is provided inside the main body, a connecting side wall is provided at the first end of the main body facing the liquid cooling plate, the connecting side wall is provided with a plug-in through hole, and the plug-in through hole is connected to the third cavity;

[0015] A buckle is provided at the first end of the liquid cooling plate, and the buckle can be inserted into the third cavity via the plug-in through hole, and the buckle abuts against the connecting side wall in the third cavity.

[0016] In any of the above technical solutions, further, the buckle includes a fixing seat and a claw, and the claw is connected to the side wall of the liquid cooling plate in a predetermined direction through the fixing seat;

[0017] A guide surface is provided on a surface of the fixing seat which is away from the second end of the liquid cooling plate;

[0018] The clamping claw is spaced apart from a side wall of the liquid cooling plate in a predetermined direction.

[0019] In any of the above technical solutions, further, the liquid cooling device also includes a sealing member;

[0020] The sealing member is disposed between the liquid cooling plate and the plug-in through hole so that the third cavity is in sealed communication with the first cavity.

[0021] In any of the above technical solutions, further, the battery cell has a side surface, the side surface includes two opposite large surfaces and two small surfaces, and the large surface is in contact with the liquid cooling plate.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] In the process of assembling the current collecting plate and the multiple liquid cooling plates, the battery pack provided by the present application needs to connect the multiple liquid cooling plates and the multiple main bodies one by one, so that the first cavity of the liquid cooling plate and the second cavity of the current collecting part are interconnected, and therefore the multiple liquid cooling plates and the multiple main bodies need to be aligned one by one in a predetermined direction. And by configuring the current collecting part to bend and extend along the predetermined direction, the current collecting part can be straightened to expand the width in the predetermined direction when the size of the battery cell is too large, so that the position of each main body has a variation to adapt to the position tolerance of each current collecting plate, that is, the current collecting plate can absorb the relative position tolerance between each liquid cooling plate, so that the liquid cooling device can be assembled quickly, the assembly efficiency is improved, and the production efficiency of the battery pack is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of a liquid cooling device for a battery pack provided in Example 1 of the present application;

[0026] Figure 2 A schematic diagram of the structure of the current collecting plate of the battery pack provided in Example 1 of the present application;

[0027] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A;

[0028] Figure 4 A partially enlarged schematic diagram of a current collecting plate of a battery pack provided in Example 1 of the present application;

[0029] Figure 5 A partially enlarged schematic diagram of a liquid cooling plate of a battery pack provided in Example 1 of the present application;

[0030] Figure 6 A schematic diagram of the plug-in state of the main body of the current collecting plate and the liquid cooling plate of the battery pack provided in the first embodiment of the present application;

[0031] Figure 7 A schematic structural diagram of a current collecting portion of a current collecting plate of a battery pack provided in Embodiment 1 of the present application;

[0032] Figure 8 A schematic diagram of the structure of the battery pack provided in Example 2 of the present application.

[0033] Reference numerals:

[0034] 1-liquid cooling device; 10-collecting plate; 100-main body; 1000-connecting side wall; 1001-plug-in through hole; 1002-third cavity; 101-collecting part; 1010-telescopic part; 1011-collecting body; 1012-second cavity; 102-liquid inlet interface; 103-liquid outlet interface; 11-liquid cooling plate; 110-first end; 111-second end; 112-first cavity; 12-clip; 120-fixing seat; 1200-guide surface; 121-claw; 13-gap for deformation; 14-seal; 2-battery pack; 20-battery assembly; 200-battery cell. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment 1

[0039] See also Figures 1 to 7 Combined with Figure 8 As shown, an embodiment of the present application provides a liquid cooling device 1 for a battery pack 2 , which is used to liquid-cool the battery cells 200 in the battery pack 2 .

[0040] The liquid cooling device 1 provided in this embodiment includes a current collecting plate 10 and a liquid cooling plate 11 .

[0041] A plurality of liquid cooling plates 11 are arranged at intervals along a predetermined direction a, and a liquid cooling space is formed between adjacent liquid cooling plates 11. The liquid cooling space is used to accommodate the battery cells 200, so that the battery cells 200 in the liquid cooling space are cooled by the liquid cooling plates 11. The predetermined direction a is consistent with the thickness direction of the liquid cooling plates 11.

[0042] The two ends of the liquid cooling plate 11 in the length direction b are respectively a first end 110 and a second end 111 , wherein the predetermined direction a intersects with the length direction b, that is, the predetermined direction a is not parallel to the length direction b.

[0043] The current collecting plate 10 includes multiple main bodies 100 and multiple collecting parts 101. The first ends 110 of the multiple liquid cooling plates 11 are connected to the multiple main bodies 100 one by one. A collecting part 101 is connected between every two adjacent main bodies 100, and the collecting part 101 is configured to be retractable along a predetermined direction a.

[0044] Specifically, one of the two main bodies 100 located at the edge positions along the predetermined direction a is provided with a liquid inlet interface 102, and the other is provided with a liquid outlet interface 103. A third cavity 1002 is provided inside the main body 100, a first cavity 112 is provided inside the liquid cooling plate 11, and a second cavity 1012 is provided inside the manifold 101. The second cavity 1012 is connected to the first cavity 112 via the third cavity 1002.

[0045] Thus, the low-temperature cooling medium can flow into the collector plate 10 through the liquid inlet interface 102. The cooling medium flows through the second cavity 1012 of the collector 101 in the third cavity 1002 of the adjacent main body 100, and the cooling medium is supplied to the first cavity 112 of the liquid cooling plate 11 through the third cavity 1002 of the main body 100 and the cooling medium is refluxed from the first cavity 112 of the liquid cooling plate 11, so that the cooling medium in the multiple liquid cooling plates 11 absorbs heat from all the battery cells 200 and heats up to complete the liquid cooling of the battery cells 200. In addition, the high-temperature cooling medium after heating in the collector plate 10 can flow out through the liquid outlet interface 103.

[0046] In the process of assembling the current collecting plate 10 with the multiple liquid cooling plates 11, the liquid cooling device 1 needs to connect the multiple liquid cooling plates 11 with the multiple main bodies 100 one by one, so that the first cavity 112 and the second cavity 1012 are connected to each other. Therefore, it is necessary to align the multiple liquid cooling plates 11 with the multiple main bodies 100 one by one in a predetermined direction a. By configuring the current collecting part 101 to be retractable along the predetermined direction a, the position of each main body 100 has a variation to adapt to the position tolerance of each current collecting plate 10, that is, the current collecting plate 10 can absorb the relative position tolerance between each liquid cooling plate 11, ensuring that all the current collecting parts 101 are connected to all the liquid cooling plates 11 at one time, so that the liquid cooling device 1 can be quickly assembled, the assembly efficiency is improved, and the production efficiency of the battery pack 2 using it is significantly improved.

[0047] In this embodiment, the header 101 includes a telescopic portion 1010, and the telescopic portion 1010 is curved so that the header 101 can be telescopic along a predetermined direction a. That is, by changing the degree of curvature of the telescopic portion 1010, the size of the header 101 along the predetermined direction a is adjusted, so as to achieve the purpose of making the header 101 telescopic along the predetermined direction a. Specifically, the degree of curvature of the telescopic portion 1010 can be adjusted accordingly according to the actual position tolerance of the liquid cooling plate 11.

[0048] Optionally, the curved telescopic portion 1010 may be specifically V-shaped, arc-shaped, wavy-shaped or accordion-shaped, etc., without any exhaustive or limiting examples herein, as long as the purpose of making the collecting portion 101 telescopic by changing the degree of bending can be achieved.

[0049] In an optional scheme of this embodiment, the current collecting part 101 also includes a current collecting body part 1011, which is in the shape of a flat plate, and both ends of the telescopic part 1010 in the predetermined direction a are connected to the main body part 100 through the current collecting body part 1011, thereby, on the one hand, improving the deformation resistance of the current collecting part 101 after assembly, and on the other hand, helping to improve the connection reliability between the current collecting part 101 and the main body part 100.

[0050] Optionally, in order to improve molding convenience, the current collecting body part 1011 and the telescopic part 1010 are integrally molded.

[0051] In an optional solution of this embodiment, the current collecting portion 101 is integrally connected to the main body 100 , which is beneficial to improving the sealing performance of the current collecting plate 10 and preventing the cooling medium from leaking at the connection between the current collecting portion 101 and the main body 100 .

[0052] Optionally, the material of the current collecting plate 10 is metal, and the current collecting part 101 and the main body 100 are welded or stamped; or, the material of the current collecting plate 10 is plastic, and the current collecting part 101 and the main body 100 are integrally formed by injection molding. The material of the current collecting plate 10 includes the material of the current collecting body 1011 and the material of the telescopic part 1010.

[0053] In an optional solution of this embodiment, the thickness of the collecting part 101 is smaller than the thickness of the main body 100, thereby ensuring that the main body 100 has stronger rigidity than the collecting part 101, which can not only improve the connection reliability between the main body 100 and the liquid cooling plate 11, but also help to ensure the scalability of the collecting part 101.

[0054] In an optional solution of this embodiment, the main body 100 is plugged into the first end 110 of the liquid cooling plate 11, that is, the collecting plate 10 is only arranged at the first end 110 of the liquid cooling plate 11 but not at the second end 111 of the liquid cooling plate 11, and the two are assembled in a plug-in manner.

[0055] This helps to simplify the structure of the liquid cooling device 1 and the connection operation between the two, thereby saving manufacturing costs.

[0056] In an optional solution of this embodiment, a connecting side wall 1000 is provided at the first end 110 of the main body 100 facing the liquid cooling plate 11 . The connecting side wall 1000 is provided with a plug-in through hole 1001 . The plug-in through hole 1001 is connected to the third cavity 1002 .

[0057] A buckle 12 is provided at the first end 110 of the liquid cooling plate 11, and the buckle 12 can be inserted into the third cavity 1002 via the plug-in through hole 1001. The buckle 12 abuts against the connecting side wall 1000 in the third cavity 1002, so that the buckle 12 limits the liquid cooling plate 11 and the main body 100 in the length direction b of the liquid cooling plate 11, preventing the liquid cooling plate 11 from being disengaged from the main body 100 via the plug-in through hole after the plug-in is completed, so that the main body 100 and the liquid cooling plate 11 can be reliably plugged in.

[0058] Optionally, the main body 100 is in the shape of a square column, and the connecting side wall 1000 is a side wall of the square column in its circumferential direction.

[0059] In an optional solution of this embodiment, the buckle 12 includes a fixing seat 120 and a claw 121, and the claw 121 is connected to the side wall of the liquid cooling plate 11 in the predetermined direction a through the fixing seat 120, that is, the buckle 12 is connected to the side wall in the thickness direction of the liquid cooling plate 11. Optionally, the buckle 12 is provided on both side walls in the thickness direction of the liquid cooling plate 11.

[0060] The surface of the fixing seat 120 facing away from the second end 111 of the liquid cooling plate 11 is provided with a guide surface 1200 , and the claw 121 is spaced apart from the side wall of the liquid cooling plate 11 in a predetermined direction a, thereby forming a gap 13 for deformation between the claw 121 and the side wall of the liquid cooling plate 11 .

[0061] Therefore, when the liquid cooling plate 11 is inserted into the corresponding main body 100, the insertion resistance between the fixing seat 120 and the plug-in through hole 1001 can be reduced by the guide plane, and the buckle 12 can be quickly aligned with the plug-in through hole 1001. Furthermore, in the process of continuing to push the buckle 12 into the plug-in through hole 1001, the claw 121 can be offset and deformed toward the gap 13 available for deformation, reducing the protrusion of the claw 121 relative to the side wall of the liquid cooling plate 11, further reducing the resistance of the buckle 12 to push into the plug-in through hole 1001, thereby reducing the difficulty of plugging the liquid cooling plate 11 and the main body 100 and improving the efficiency of the plug-in operation. In addition, until the buckle 12 is completely inserted into the third cavity 1002, the buckle 12 restores its shape and abuts against the connecting side wall 1000, realizing the anti-slip limit between the liquid cooling plate 11 and the main body 100.

[0062] It can be seen that the fixing seat 120 can improve the connection strength between the buckle 12 and the liquid cooling plate 11 and realize the alignment and guidance of the buckle 12 relative to the plug-in through hole 1001. Through the deformable characteristics of the buckle 12, the insertion and anti-slip limiting after insertion are realized.

[0063] In an optional scheme of this embodiment, the liquid cooling device 1 also includes a seal 14, which is arranged between the liquid cooling plate 11 and the plug-in through hole 1001. In other words, the seal 14 seals the installation gap between the liquid cooling plate 11 and the plug-in through hole 1001, so that the third cavity 1002 is sealed and connected with the first cavity 112, so that the cooling medium will not leak through the installation gap between the plug-in through hole 1001 and the liquid cooling plate 11 when flowing between the first cavity 112 of the liquid cooling plate 11 and the third cavity 1002 of the main body 100.

[0064] Optionally, the sealing member 14 is a sealing ring, which is disposed around the first end 110 of the liquid cooling plate 11 and a circumferential edge of the plug-in through hole 1001 .

[0065] Embodiment 2

[0066] Embodiment 2 provides a battery pack, which includes the liquid cooling device in Embodiment 1. The technical features of the liquid cooling device disclosed in Embodiment 1 are also applicable to this embodiment, and the technical features of the liquid cooling device disclosed in Embodiment 1 will not be described repeatedly.

[0067] Combination Figures 1 to 7 See also Figure 8As shown, the battery pack 2 provided in this embodiment includes a battery cell 200 and a liquid cooling device 1 .

[0068] A battery cell 200 is disposed between each two adjacent liquid cooling plates 11 of the liquid cooling device 1, that is, the battery cell 200 is disposed in the liquid cooling space between the two adjacent liquid cooling plates 11, so that the battery cells 200 in the liquid cooling space are liquid cooled simultaneously by the two liquid cooling plates 11. When a plurality of battery cells 200 are disposed between two adjacent liquid cooling plates 11, the plurality of battery cells 200 may form a battery assembly 20 in a module form or a non-module form.

[0069] The battery cell 200 is attached to the liquid cooling plate 11, so that the battery cell 200 and the liquid cooling plate 11 exchange heat through contact. Further, the battery cell 200 includes a side surface, and the side surface includes two opposite large surfaces and two opposite small surfaces, wherein the large surface is attached to the liquid cooling plate 11, and each battery cell 200 exchanges heat with the liquid cooling plate 11 through its large surface, so that the large surface heat exchange of each battery cell 200 is achieved through the liquid cooling device 1. The battery pack 2 improves production efficiency while achieving liquid cooling of the large surface of its battery cell 200.

[0070] The battery pack in this embodiment has the advantages of the liquid cooling device in the first embodiment, and the advantages of the liquid cooling device disclosed in the first embodiment will not be repeated here.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model. In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means that they are within the scope of the utility model and form different embodiments. For example, any one of the embodiments claimed for protection can be used in any combination. The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A battery pack (2), characterized in that: Comprising a battery cell (200) and a liquid cooling device (1), the liquid cooling device (1) comprising a current collecting plate (10) and a plurality of liquid cooling plates (11), the battery cell (200) being arranged between each two adjacent liquid cooling plates (11); The plurality of liquid cooling plates (11) are arranged at intervals along a predetermined direction (a), a first cavity (112) is provided inside the liquid cooling plate (11), and two ends of the liquid cooling plate (11) in a length direction (b) are respectively a first end (110) and a second end (111); wherein the predetermined direction (a) intersects with the length direction (b); The current collecting plate (10) comprises a plurality of main bodies (100) and a plurality of current collecting parts (101); a second cavity (1012) is arranged inside the current collecting part (101); the first ends (110) of the plurality of liquid cooling plates (11) are connected to the plurality of main bodies (100) in a one-to-one correspondence, and the first cavity (112) and the second cavity (1012) are connected to each other through the main body (100); A current collecting portion (101) is connected between every two adjacent main body portions (100), and the current collecting portion (101) bends and extends along the predetermined direction (a).

2. The battery pack (2) according to claim 1, characterized in that: The current collecting portion (101) comprises a telescopic portion (1010), and the telescopic portion (1010) is curved so that the current collecting portion (101) can be telescoped along the predetermined direction (a).

3. The battery pack (2) according to claim 2, characterized in that: The current collecting portion (101) further comprises a current collecting body portion (1011), the current collecting body portion (1011) is in the shape of a flat plate, and both ends of the telescopic portion (1010) in the predetermined direction (a) are connected to the main body portion (100) through the current collecting body portion (1011).

4. The battery pack (2) according to claim 1, characterized in that: The collecting portion (101) is integrally connected to the main body portion (100).

5. The battery pack (2) according to claim 4, characterized in that: The thickness of the collecting portion (101) is smaller than the thickness of the main body portion (100).

6. The battery pack (2) according to claim 1, characterized in that: The main body (100) is plugged into the first end (110) of the liquid cooling plate (11).

7. The battery pack (2) according to claim 6, characterized in that: A third cavity (1002) is arranged inside the main body (100), a connecting side wall (1000) is arranged at a first end (110) of the main body (100) facing the liquid cooling plate (11), the connecting side wall (1000) is provided with a plug-in through hole (1001), and the plug-in through hole (1001) is connected to the third cavity (1002); The first end (110) of the liquid cooling plate (11) is provided with a buckle (12), and the buckle (12) can be inserted into the third cavity (1002) via the plug-in through hole (1001), and the buckle (12) abuts against the connecting side wall (1000) in the third cavity (1002).

8. The battery pack (2) according to claim 7, characterized in that: The buckle (12) comprises a fixing seat (120) and a claw (121), and the claw (121) is connected to the side wall of the liquid cooling plate (11) in the predetermined direction (a) through the fixing seat (120); A guide surface (1200) is provided on a surface of the fixing seat (120) facing away from the second end (111) of the liquid cooling plate (11); The clamping claw (121) is spaced apart from a side wall of the liquid cooling plate (11) in the predetermined direction (a).

9. The battery pack (2) according to claim 7, characterized in that: Also includes a sealing member (14); The sealing member (14) is arranged between the liquid cooling plate (11) and the plug-in through hole (1001) so as to enable the third cavity (1002) to be in sealed communication with the first cavity (112).

10. The battery pack (2) according to claim 1, characterized in that: The battery core (200) has a side surface, the side surface comprises two opposite large surfaces and two small surfaces, and the large surface is in contact with the liquid cooling plate (11).

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