Liquid cooling assembly, battery pack and vehicle

Abstract

The utility model discloses a liquid cooling assembly, a battery pack and a vehicle, a protection unit is additionally arranged in the liquid cooling assembly, during installation, a pressure release valve and a heat exchange pipe are located on the two sides of the side wall section of the protection unit in the second direction respectively, and a first bent section extends towards the heat exchange pipe and at least shields at least part of the area, away from the heat exchange face, of the heat exchange pipe; when the battery cell is in thermal runaway, the heat exchange tube can be isolated from the pressure release valve and is shielded by the first bending section, so that the probability that a high-temperature eruption substance erupted from the pressure release valve is sprayed onto the heat exchange tube is reduced, the probability that a fluid medium in the heat exchange tube flows out is reduced, and the risk of short circuit in the battery pack can be reduced; meanwhile, a fluid channel can be formed between the two side wall sections, and high-temperature eruption substances ejected from the pressure relief valve can flow to the two end parts of the liquid cooling assembly along the two side wall sections so as to flow out from the pressure relief opening of the battery pack.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a liquid cooling component, a battery pack, and a vehicle. Background Technology

[0002] Currently, battery packs typically consist of multiple cells. Each cell has a casing, electrode assembly, positive terminal, and negative terminal. The electrode assembly is encapsulated inside the casing and is electrically connected to an external busbar through two terminals. The busbar enables series and parallel connections between cells to form a battery pack.

[0003] When the battery pack is working, mechanical components such as terminals and busbars will generate heat. Especially during fast charging, the Joule heat generated by mechanical components such as terminals and busbars of the battery cell increases exponentially. If the heat of the overcurrent components cannot be carried away in time, the heat will be transferred to the winding of the battery cell, causing it to heat up rapidly. When the internal pressure of the casing exceeds the preset pressure threshold, the high-temperature medium inside the casing will be ejected from the pressure relief valve on the top cover.

[0004] Currently, to reduce the temperature of the terminals and busbars, heat exchange tubes are installed above the busbars. The fluid medium in the heat exchange tubes cools the busbars and terminals. When a cell experiences thermal runaway, the high-temperature medium ejected from inside the casing can puncture the wall of the heat exchange tubes, causing the fluid medium inside to flow out. This fluid medium mixes with the high-temperature medium ejected from inside the casing, resulting in a large volume of solution inside the battery pack. When this mixture comes into contact with conductive components inside the battery pack, it can cause a short circuit.

[0005] How to reduce the risk of short circuit in the battery pack when the battery cell experiences thermal runaway is an important issue of concern to those skilled in the art. Utility Model Content

[0006] The purpose of this application is to provide a liquid cooling component that can reduce the risk of short circuits in a battery pack. Another purpose of this application is to provide a battery pack and vehicle having the above-mentioned liquid cooling component.

[0007] This application provides a liquid cooling assembly, including:

[0008] At least one heat exchange tube having a heat exchange surface, each of the heat exchange tubes extending along a first direction;

[0009] A protection unit, corresponding to each heat exchange tube, includes at least a connected sidewall section and a first bending section. The sidewall section includes a first side and a second side that are arranged opposite to each other and both extend along the first direction. The first bending section is connected to the first side, and the second side is provided with a battery cell abutment. The first bending section is located on the side of the heat exchange tube away from the heat exchange surface and at least covers at least a portion of the area of ​​the heat exchange tube away from the heat exchange surface.

[0010] During installation, the cell abutment part abuts against the cell top cover plate and can avoid the pressure relief valve. The pressure relief valve and the heat exchange tube are located on both sides of the side wall section along the second direction. That is to say, the side wall section can separate the pressure relief valve and the heat exchange tube. The first bending section extends toward the heat exchange tube and at least blocks at least a part of the area of ​​the heat exchange tube away from the heat exchange surface. When the cell thermally runs away, because the heat exchange tube can be isolated from the pressure relief valve and blocked by the first bending section, the probability of high-temperature ejected material from the pressure relief valve spraying onto the heat exchange tube is reduced, and the probability of the fluid medium inside the heat exchange tube flowing out is reduced, which can reduce the risk of short circuit inside the battery pack.

[0011] At the same time, a fluid channel can be formed between the two side wall sections, and the high-temperature ejected material from the pressure relief valve can flow along the two side wall sections to both ends of the liquid cooling component so that it can flow out from the pressure relief port of the battery pack.

[0012] In one example, the number of heat exchange tubes is at least two, and each heat exchange tube is arranged at intervals along a second direction. A second bend is provided on the second side. The battery cell abutment includes the surface of the second bend away from the side wall section. The second bend and the first bend are respectively located on both sides of the side wall section along the second direction. The second bend has a pressure relief valve avoidance channel.

[0013] In one example, at least two of the protection units are included, and the second sides of the two sidewall segments of adjacent protection units are connected by a second bending segment. The second bending segment is provided with a pressure relief valve avoidance channel, and the cell abutment includes the surface of the second bending segment that faces away from the sidewall segment.

[0014] In one example, the pressure relief valve clearance channel is an elongated orifice, the dimension of which along the second direction is H1, and the dimension along the first direction is L1, where H1 satisfies the following formula: 0.5H2≤H1≤1.5H2.

[0015] Or / and, L1 satisfies the following formula: L2≤L1≤3 / 2L2;

[0016] Wherein, H2 is the maximum dimension of the pressure relief valve along the second direction, and L2 is the maximum dimension of the pressure relief valve along the first direction.

[0017] In one example, in the second direction, the projection of the first bent segment onto the plane where the heat exchange tube is located completely covers the projection of the heat exchange tube.

[0018] In one example, the first bent section is in close contact with the heat exchange tube;

[0019] Alternatively / and, the sidewall section facing the first bend section abuts against the heat exchange tube adjacent to it.

[0020] In one example, the first bent section is bonded and fixed to the heat exchange tube by an adhesive component;

[0021] Alternatively / and, the surface of the second bent section opposite to the sidewall section is provided with an elastic layer.

[0022] In one example, the thickness of the protection unit ranges from 0.5 mm to 1.5 mm;

[0023] Alternatively / and, along the second direction, the length of the heat exchange tube extending below the first bend is L3, wherein L3 satisfies the following formula: 0mm≤L3≤10mm.

[0024] This application embodiment also provides a battery pack, including at least one row of cell groups, each cell group including at least one cell, the battery pack further including the liquid cooling component described in any of the above claims, the heat exchange tubes being arranged in a one-to-one correspondence with the terminals of the battery group, and the first bending section covering each cell in one of the cell groups along the first direction.

[0025] In one example, along the second direction, the first bend extends to a busbar below it for a length of L4, wherein L4 satisfies the following formula: 0mm≤L4≤10mm.

[0026] This application also provides a vehicle, including a vehicle body on which the aforementioned battery pack and / or the liquid cooling assembly described in any of the preceding claims are mounted.

[0027] The battery pack and vehicle in this embodiment have the above-mentioned liquid cooling components, and therefore both also have the above-mentioned technical effects of the liquid cooling components. Attached Figure Description

[0028] Figure 1 This is an exploded view of the liquid cooling assembly and battery cell assembly in one embodiment of this application;

[0029] Figure 2 for Figure 1 The diagram shows the structure in an assembled state; only one battery cell in the battery pack is shown in dashed lines.

[0030] Figure 3 for Figure 1 A top view of the battery cell in the structure shown;

[0031] Figure 4 for Figure 1 Schematic diagram of the structure of the middle protective component;

[0032] Figure 5 for Figure 2 The structure shown is a cross-sectional view of AA.

[0033] in, Figures 1 to 5 The one-to-one correspondence between the reference numerals and component names in the attached drawings is as follows:

[0034] 100 Liquid cooling assembly; 1 heat exchange tube; 2 protective component; 2A protection unit; 21 side wall section; 22 first bend section; 23 second bend section; 24 pressure relief valve clearance channel; 3 first connecting pipe;

[0035] 200 Heat exchange assembly; 210 Heat exchange tube; 220 Current collector; 230 Second connecting pipe;

[0036] 300 battery cell assembly; 310 battery cell; 311 terminal post; 312 pressure relief valve; 313 housing; 314 pole group; 315 top cover plate; 320 busbar. Detailed Implementation

[0037] This application uses the example of upright mounting of each battery cell, where the tabs and explosion-proof valves of each cell are located on top of the cell, to illustrate the technical solution and its effects. Additionally, this application uses the application of liquid cooling components in a battery pack as an example to illustrate the technical solution and its effects. Of course, it is not excluded that the liquid cooling components of this application can be applied in other environments to achieve the same or equivalent technical effects.

[0038] Please refer to Figures 1 to 5 , Figure 1 This is an exploded view of the liquid cooling assembly and battery cell assembly in one embodiment of this application; Figure 2 for Figure 1 The diagram shows the structure in an assembled state; only one battery cell in the battery pack is shown in dashed lines. Figure 3 for Figure 1 A top view of the battery cell in the structure shown; Figure 4 for Figure 1 Schematic diagram of the structure of the middle protective component; Figure 5 for Figure 2 The structure shown is a cross-sectional view of AA.

[0039] This application embodiment provides a battery pack, the battery pack including a housing ( Figure 1 (Not shown in the image) and several battery cells located inside the casing, the battery cells are stacked along the x-direction to form a battery cell group 300. Figure 1 Only three rows of cell groups 300 are shown in the diagram, and only a few cells 310 are shown in each row of cell groups 300. The number of cells 310 in each row of cell groups 300 is not limited to that shown in the diagram. Similarly, the inside of the housing can have one row of cell groups 300, or it can have at least N rows of cell groups 300 arranged along the y-direction. Figure 1 The image shows a three-cell pack 300.

[0040] Please combine Figure 3Understandably, each battery cell 310 has two terminals 311, a positive terminal and a negative terminal, respectively. All the terminals of the battery cells are connected in series or / and in parallel via bus 320 according to a set rule to form a power supply. Please refer to [reference needed]. Figure 1 Understanding: One terminal of a battery cell 310 is electrically connected to the terminal of an adjacent battery cell 310 via a busbar 320. The two terminals 311 connected can be either positive or negative. The positive and negative terminals can be made of single-component materials, such as copper or aluminum, which have good conductivity, or composite materials of different components, such as copper-aluminum composites, which have good conductivity, as long as good conductivity is achieved.

[0041] Please combine again Figure 5 Understandably, in this embodiment, a battery cell includes a housing 313 and an electrode assembly 314 encapsulated inside the housing. The housing 313 has an opening at its upper end, and a top cover is provided at the opening. Typically, the top cover is installed at the opening of the housing 313 after the electrode assembly 314 is installed inside the housing 313. For the safety of the battery cell, a pressure relief valve 312 is provided on the top cover. When the pressure inside the housing 313 exceeds a preset pressure threshold, the high-temperature medium inside the housing 313 will break through the pressure relief valve 312 and be ejected from the pressure relief valve 312 to the outside of the housing 313. The pressure relief valve 312 can be an elongated orifice structure. Figure 3 The diagram shows that the pressure relief valve 312 has an elliptical outer contour, with a dimension of H2 along the second direction and L2 along the first direction x. As can be seen from the diagram, H2 is greater than L2. The second direction forms an angle with the first direction; an example is shown where the angle between the first and second directions is approximately 90 degrees, meaning the first and second directions are perpendicular.

[0042] The battery pack in this embodiment further includes a liquid cooling assembly 100, which is mounted on top of each cell group 300 forming an integral unit. In this embodiment, the liquid cooling assembly 100 includes at least one heat exchange tube 1. The number of heat exchange tubes 1 can be one or more. When there are two or more heat exchange tubes 1, they are spaced apart along a second direction. The length of the heat exchange tube 1 extends along a first direction x, and the length of the heat exchange tube 1 can be greater than the length of a row of cell groups 300 along the first direction. The heat exchange tube 1 is located above a row of terminals of the cell group 300. Specifically, the heat exchange tube 1 is located above the busbar. When fluid flows through the interior of the heat exchange tube 1, the fluid can exchange heat with components such as the busbar and terminals through the wall of the heat exchange tube 1. The heat exchange tube 1 can be a rectangular tube with a rectangular cross-section. The interior of the heat exchange tube 1 can have a flow channel extending along the x direction, or it can be divided into multiple flow channels, such as a harmonica tube, which can reduce the overall height of the liquid cooling assembly 100. Of course, in some embodiments, the cross-section of the heat exchange tube 1 can also be other shapes, such as a circular tube, which has lower fluid resistance. The heat exchange tube 1 can also adopt different shapes, depending on the specific product.

[0043] In this embodiment, each heat exchange tube 1 may have a first connecting pipe 3 at both ends for connecting to an external fluid medium pipeline. Of course, the liquid inlet and outlet methods of the heat exchange tube 1 are not limited to those described herein, and can also be other methods. For example, a collector may be provided at both ends of all heat exchange tubes 1, and the two ends of all heat exchange tubes 1 may be inserted into two collectors respectively. The collectors may have inlets and outlets, that is, the external fluid medium flows into each heat exchange tube 1 after passing through the collectors, simplifying the structure of the liquid cooling assembly 100.

[0044] When the liquid cooling assembly 100 is installed in the battery pack, one heat exchange tube 1 corresponds to one row of terminals arranged along the first direction. That is, a heat exchange tube 1 is installed above the positive terminal of the battery cell assembly, and a heat exchange tube 1 is also installed above the negative terminal of the battery cell assembly. Ideally, the heat exchange tube 1 can completely cover the terminals and busbars. Adjacent heat exchange tubes 1 are arranged at intervals, and the gap between them can avoid the pressure relief valve on the battery cell.

[0045] In this embodiment, the liquid cooling assembly 100 further includes a protective element 2, which has at least one protective unit 2A. Each protective unit 2A corresponds to a heat exchange tube 1. Each protective unit 2A includes at least a connected sidewall segment 21 and a first bent segment 22. The sidewall segment 21 includes a first side and a second side, both arranged opposite each other and extending along a first direction. The first bent segment 22 is connected to the first side, and the second side has a battery cell abutment portion for abutting against the upper cover plate of the battery cell. The first bent segment 22 is located on the side of the heat exchange tube 1 facing away from the heat exchange surface, and the first bent segment 22 at least covers at least a portion of the area of ​​the heat exchange tube 1 facing away from the heat exchange surface. Ideally, in the second direction, the projection of the first bent segment 22 in the plane where the heat exchange tube 1 is located completely covers the projection of the heat exchange tube 1, thus completely blocking the heat exchange tube 1. When the first bent segment 22 is a flat plate, its length in the second direction is greater than the length of the heat exchange tube 1 in the second direction.

[0046] During installation, the cell abutment part abuts against the cell top cover plate and can avoid the pressure relief valve. The pressure relief valve and the heat exchange tube 1 are located on both sides of the side wall section 21 along the second direction. That is to say, the side wall section 21 can separate the pressure relief valve and the heat exchange tube 1. The first bending section 22 extends toward the heat exchange tube 1 and at least blocks at least a part of the area of ​​the heat exchange tube 1 away from the heat exchange surface. When the cell thermally runs away, because the heat exchange tube 1 can be isolated from the pressure relief valve and blocked by the first bending section 22, the probability of high-temperature ejected material from the pressure relief valve being sprayed onto the heat exchange tube 1 is reduced, and the probability of the fluid medium inside the heat exchange tube 1 flowing out is reduced, which can reduce the risk of short circuit inside the battery pack.

[0047] Meanwhile, a fluid channel can be formed between the two side wall sections 21, and the high-temperature ejected material from the pressure relief valve can flow along the two side wall sections 21 to both ends of the liquid cooling assembly 100 so that it can flow out from the pressure relief port of the battery pack.

[0048] The protective component 2 can be made of a high-temperature resistant, fire-resistant, and insulating material, such as mica. The thickness of each protective unit 2A in the protective component 2 can be approximately 0.5mm to 1.5mm. Values ​​within this thickness range can meet the protection requirements of different battery pack heat exchange tubes 1, and the protective component 2 within this thickness range is relatively lightweight. The specific thickness value can be reasonably selected according to the intensity of the jetting from the pressure relief valve inside the battery pack.

[0049] In this embodiment, a second bending section 23 is further provided on the second side. The cell abutment portion includes the surface of the second bending section 23 facing away from the sidewall section 21. The second bending section 23 and the first bending section 22 are respectively located on both sides of the sidewall section 21 along the second direction. That is to say, the protection unit 2A can be a Z-shaped structure, and the protection unit 2A of each heat exchange tube 1 is independent of each other and arranged along the second direction. The structure of the protection unit 2A is relatively simple and easy to implement.

[0050] When the protection unit 2A is installed, the first bending section 22 can abut against the heat exchange tube 1, and the second bending section 23 can abut against the top cover of the battery cell, which can provide good support for the protection unit 2.

[0051] To improve the sealing between the second bending section 23 and the battery cell, an elastic layer is provided on the surface of the second bending section 23 away from the side wall section 21. The elastic layer can be an adhesive layer or foam, etc.

[0052] In this embodiment, the number of protection units 2A is at least two. The second side edges of the two side wall sections 21 of adjacent protection units 2A are connected by a second bending section 23. The second bending section 23 is provided with a pressure relief valve avoidance channel 24. The battery cell abutment part includes the surface of the second bending section 23 that faces away from the side wall section 21. The two protection units 2A form a protection component 2, which is convenient for installation.

[0053] For the pressure relief valve having an elongated orifice, the pressure relief valve clearance channel 24 can also be an elongated orifice. The dimension of the elongated orifice along the second direction is H1, and the dimension along the first direction is L1. H1 satisfies the following formula: 0.5H2≤H1≤1.5H2, or / and L1 satisfies the following formula: L2≤L1≤3 / 2L2; where H2 is the maximum dimension of the pressure relief valve along the second direction, and L2 is the maximum dimension of the pressure relief valve along the first direction. This pressure relief valve clearance channel 24, within the aforementioned dimensional range, satisfies both the normal opening of the pressure relief valve and avoids excessive exposure of the battery cell housing, thus preventing insulation risks.

[0054] In this embodiment, the first bent section 22 is fitted to the heat exchange tube 1; when assembling the heat exchange tube 1, it is only necessary to place the first bent section 22 on the heat exchange tube 1, and the assembly is simple.

[0055] In this embodiment, the sidewall section 21 facing the first bent section 22 is in close contact with the adjacent heat exchange tube 1, so that the heat exchange tube 1 can further play the role of positioning the sidewall section 21 and improve assembly efficiency.

[0056] In this embodiment, along the second direction, the first bent section 22 extends to a length L3 below the heat exchange tube 1, where L3 satisfies the formula: 0mm ≤ L3 ≤ 10mm. The first bent section 22 can be any value within the above range. Ensuring that the first bent section 22 completely blocks the heat exchange tube 1 along the second direction, a length less than 10mm in the first bent section 22 can save space within the battery pack as much as possible. Similarly, in a specific embodiment, along the second direction, the first bent section 22 extends to a length L4 below the busbar, where L4 satisfies the formula: 0mm ≤ L4 ≤ 10mm.

[0057] In the above embodiments, the first bent section 22 and the heat exchange tube 1 can be bonded and fixed by an adhesive component, such as double-sided tape or structural adhesive, which can serve an adhesive and fixing function. Fixing the first bent section 22 by an adhesive component is simple, occupies little space, and is easy to implement. In the above embodiments, along the first direction, the first bent section 22 covers each cell in a cell group. The length of the first bent section 22 can also cover the heat exchange tube 1, thus providing better protection for the heat exchange tube 1 and mechanical components such as busbars on the cells.

[0058] Of course, to better cool the inside of the battery pack, a heat exchange assembly 200 can be further installed at the bottom of the cell assembly 300. The heat exchange assembly 200 also includes heat exchange tubes 210, and the number of heat exchange tubes 210 can be one or several. Figure 1 The latter is illustrated in the diagram, where the heat exchange tubes 210 extend along a first direction x, and all heat exchange tubes 210 are arranged along a second direction y. The heat exchange assembly 200 also includes two collectors 220, located at both ends of the heat exchange tubes 210 along their length. The ends of the heat exchange tubes 210 are respectively inserted into the two collectors 220. A second connecting pipe 230 is provided on each collector 220, which can serve as a fluid inlet or outlet. The specific structure of the heat exchange assembly 200 will not be described in detail here; please refer to current technology.

[0059] This application also provides a vehicle, including a vehicle body, on which the above-described battery pack and / or the liquid cooling component described in any of the above embodiments are installed.

[0060] The vehicle and battery pack in this embodiment have the liquid cooling component 100 described above, so the vehicle and battery pack also have the above-mentioned technical effects of the liquid cooling component 100.

[0061] For other structures of the battery pack, please refer to the current technology; this application will not elaborate further.

[0062] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0063] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0064] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A liquid cooling assembly, characterized in that, include: At least one heat exchange tube having a heat exchange surface, each of the heat exchange tubes extending along a first direction; The protection unit (2A) corresponds to the heat exchange tube. The protection unit (2A) includes at least a connected side wall section (21) and a first bending section (22). The side wall section (21) includes a first side and a second side that are arranged opposite to each other and both extend along the first direction. The first bending section (22) is connected to the first side. The second side is provided with a battery cell abutment. The first bending section (22) is located on the side of the heat exchange tube away from the heat exchange surface and at least blocks at least a portion of the area of ​​the heat exchange tube away from the heat exchange surface.

2. The liquid cooling assembly (100) according to claim 1, characterized in that, The number of heat exchange tubes is at least two, and each heat exchange tube is arranged at intervals along the second direction. The second side is also provided with a second bending section (23). The battery cell abutment part includes the surface of the second bending section (23) away from the side wall section (21). The second bending section (23) and the first bending section (22) are respectively located on both sides of the side wall section (21) along the second direction. The second bending section (23) has a pressure relief valve avoidance channel (24).

3. The liquid cooling assembly (100) according to claim 2, characterized in that, It includes at least two of the protection units (2A), and the second side of the two side wall sections (21) of the adjacent protection units (2A) are connected by a second bending section (23). The second bending section (23) is provided with a pressure relief valve avoidance channel (24). The battery cell abutment includes the surface of the second bending section (23) away from the side wall section (21).

4. The liquid cooling assembly (100) according to claim 3, characterized in that, The pressure relief valve clearance channel (24) is an elongated orifice. The dimension of the elongated orifice along the second direction is H1, and the dimension of the elongated orifice along the first direction is L1. H1 satisfies the following formula: 0.5H2≤H1≤1.5H2. Or / and, L1 satisfies the following formula: L2≤L1≤3 / 2L2; Wherein, H2 is the maximum dimension of the pressure relief valve along the second direction, and L2 is the maximum dimension of the pressure relief valve along the first direction.

5. The liquid cooling assembly (100) according to any one of claims 2 to 4, characterized in that, In the second direction, the projection of the first bent segment (22) in the plane where the heat exchange tube is located completely covers the projection of the heat exchange tube.

6. The liquid cooling assembly (100) according to any one of claims 1 to 4, characterized in that, The first bent section (22) is in close contact with the heat exchange tube; Alternatively / and, the sidewall section (21) is in contact with the heat exchange tube adjacent to the side of the first bent section (22).

7. The liquid cooling assembly (100) according to any one of claims 2 to 4, characterized in that, The first bent section (22) is bonded and fixed to the heat exchange tube by an adhesive component; Alternatively / and, the surface of the second bending segment (23) facing away from the sidewall segment (21) is provided with an elastic layer.

8. The liquid cooling assembly (100) according to any one of claims 1 to 4, characterized in that, The thickness of the protection unit (2A) ranges from 0.5 mm to 1.5 mm; Alternatively / and, along the second direction, the first bend (22) extends below the heat exchange tube by a length of L3, wherein L3 satisfies the following formula: 0mm≤L3≤10mm.

9. A battery pack, characterized in that, The battery pack includes at least one column of battery cells, each of the battery cells includes at least one battery cell, and the battery pack also includes a liquid cooling assembly (100) according to any one of claims 1 to 8, wherein the heat exchange tube is provided in a one-to-one correspondence with the terminal post (311) of the battery cell group (300), and along the first direction, the first bending section (22) covers each battery cell in one of the battery cell groups (300).

10. The battery pack according to claim 9, characterized in that, Along the second direction, the first bend (22) extends to a busbar (320) below it for a length of L4, which satisfies the following formula: 0mm≤L4≤10mm.

11. A vehicle, characterized in that, Includes a vehicle body on which the battery pack of claim 9 or 10 is mounted, or / and the liquid cooling assembly (100) of any one of claims 1 to 8.

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