Battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a battery module and a battery pack. The battery module comprises a battery cell group and a radiating fin, the battery cell group is provided with a first surface, a second surface and a third surface which are adjacent to one another; the battery cell group comprises at least one battery cell. The third surface is positioned on one side, facing the liquid cooling bottom plate of the battery box, of the battery cell group. The radiating fins are in heat-conducting connection with the first surface and the second surface. And the cooling fins are configured to be in heat conduction connection with the side walls of the battery box. In the first direction, the cooling fins and the third surface are arranged at intervals. Therefore, the technical problem of insufficient heat dissipation formation of the battery cell can be improved, the charge-discharge performance of the battery is improved, and the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery module and battery pack. BACKGROUND

[0002] In the related art, the battery box usually cools the bottom surface of the battery module by using a liquid cooling bottom plate. However, as the charging rate increases and the charging time shortens, the liquid cooling solution for the bottom surface of the battery cell cannot timely remove the heat generated during battery charging and discharging, affecting the charging and discharging performance and the service life of the battery. SUMMARY

[0003] The embodiments of the utility model provide a battery module and a battery pack, which can improve the technical problem of insufficient heat dissipation of battery cells, improve the charging and discharging performance of the battery, and prolong the service life of the battery.

[0004] In a first aspect, the embodiments of the utility model provide a battery module, comprising:

[0005] A battery cell group has a first surface, a second surface and a third surface adjacent to each other, the battery cell group includes at least one battery cell, and the third surface is located on the side of the battery cell group facing the liquid cooling bottom plate of the battery box;

[0006] A heat sink is in thermal contact with the first surface and the second surface, wherein the heat sink is configured to be in thermal contact with the side wall of the battery box, and the heat sink is spaced apart from the third surface in a first direction.

[0007] In an embodiment, the heat sink includes:

[0008] A first heat conduction part is in thermal contact with the first surface;

[0009] A second heat conduction part is arranged at an angle with the first heat conduction part, and the second heat conduction part is in thermal contact with the second surface;

[0010] Wherein, the first heat conduction part and the second heat conduction part are flush with the side close to the third surface.

[0011] In an embodiment, along a second direction, the first heat conduction part has the second heat conduction part at both ends, wherein the second direction is arranged at an angle with the first direction, the battery cell group includes at least two distributed battery cells, the first heat conduction part is in thermal contact with each battery cell, and the two second heat conduction parts are in thermal contact with the two battery cells located at the edges, respectively.

[0012] In an embodiment, a first adhesive layer is arranged between each battery cell and the first heat conduction part.

[0013] In an embodiment, along the first direction, the first heat-conductive part is spaced apart from the third surface by a distance L1, which satisfies: 4mm≤L1≤8mm.

[0014] In an embodiment, the cell group further has a fourth surface, which is oppositely arranged to the third surface, and the fourth surface is configured with a pole post having an end face away from the fourth surface, wherein along the first direction, the heat sink is spaced apart from the end face.

[0015] In an embodiment, along the first direction, the distance between the heat sink and the end face is D1, and the creepage distance between the heat sink and the end face is D2, which satisfies: D1≥D2.

[0016] In an embodiment, the thickness of the heat sink is D3, which satisfies: 0.5mm≤D3≤1mm.

[0017] In a second aspect, embodiments of the utility model provide a battery pack, which comprises:

[0018] a box body;

[0019] a battery module as described above;

[0020] The battery module is arranged in the box body.

[0021] In an embodiment, the box body is provided with at least two cell groups arranged along a third direction in sequence, wherein the third direction is arranged at an angle to the first direction, and every two adjacent heat sinks are spaced apart.

[0022] In an embodiment, the distance between every two adjacent heat sinks is L2, which satisfies: 3mm≤L2≤5mm.

[0023] In an embodiment, the box body comprises a side wall, and a second adhesive layer is arranged between the heat sink and the side wall.

[0024] The embodiments of the utility model have the following beneficial effects:

[0025] In the embodiments of the utility model, the heat of the first surface and the second surface of the cell group is transmitted to the side wall of the battery box through the heat sink, and the side wall itself is used for heat dissipation or the heat is transmitted to the liquid cooling bottom plate through the side wall for heat dissipation, so that the side surface of the cell group is evenly heated and cooled, and the heat of the cell is quickly discharged. The heat sink is spaced apart from the third surface, and when the battery module is assembled in the battery box, the heat sink can be spaced apart from the liquid cooling bottom plate, and the two are not in direct contact, so that the cold of the liquid cooling bottom plate acts on the bottom surface of the cell first, and the consistency of the cell temperature is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those skilled in the art without creative efforts based on these drawings also belong to the protection scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the positional words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawing. And "inner" and "outer" are relative to the outline of the device.

[0027] Figure 1 is a structural schematic diagram of a battery pack provided by the embodiments of the present application;

[0028] Figure 2 is Figure 1 an exploded view;

[0029] Figure 3 is a structural schematic diagram of a battery module provided by the embodiments of the present application;

[0030] Figure 4 is a side view of two adjacent battery modules provided by the embodiments of the present application.

[0031] Reference signs:

[0032] 10 - cell, 110 - first surface, 120 - second surface, 130 - third surface, 140 - fourth surface, 150 - end face, 20 - heat dissipation fin, 210 - first heat conduction part, 220 - second heat conduction part, 30 - box body, 310 - liquid cooling bottom plate, 320 - side wall, 330 - second adhesive layer, 340 - foam. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the positional words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawing. And "inner" and "outer" are relative to the outline of the device.

[0034] Please refer to Figures 1 to 4The battery module provided in the embodiments of the present application includes a cell group and a heat sink. The cell group has a first surface, a second surface and a third surface adjacent to each other. The cell group includes at least one cell. The third surface is located on a side of the cell group facing a liquid cooling bottom plate of a battery box. The heat sink is in thermal contact with the first surface and the second surface. The heat sink is configured to be in thermal contact with a side wall of the battery box. In the first direction, the heat sink is spaced apart from the third surface.

[0035] In the embodiments of the present application, the heat of the first surface and the second surface of the cell group is transmitted to the side wall of the battery box through the heat sink, and the side wall itself is used for heat dissipation or the heat is transmitted to the liquid cooling bottom plate through the side wall for heat dissipation, so that the side of the cell group is evenly heated and cooled, and the heat of the cell is quickly discharged. The heat sink is spaced apart from the third surface, and when the battery module is assembled in the battery box, the heat sink is spaced apart from the liquid cooling bottom plate and does not directly contact the liquid cooling bottom plate, so that the cold of the liquid cooling bottom plate is first applied to the bottom surface of the cell to ensure the consistency of the temperature of the cell.

[0036] As shown in FIG. 1, Figure 3 The cell in the embodiments of the present application is a square cell. The first surface is a large surface of each cell in the cell group. The second surface is a side surface of a cell located at an edge in the cell group. The third surface is a bottom surface of each cell in the cell group. The heat sink can directly contact the large surface and the side surface of the cell to carry away the heat of the large surface and the side surface of the cell. Based on the fact that the heat sink is spaced apart from the bottom surface of the cell, the heat sink does not contact the liquid cooling bottom plate. Therefore, the heat sink only transmits heat to the side wall of the battery box for heat dissipation, and does not interfere with the cooling of the bottom surface of the cell by the liquid cooling bottom plate.

[0037] The heat sink is used to transmit the heat of the cell group to the side wall of the battery box. The side wall of the battery box can be formed with a liquid cooling flow channel, so as to cool the heat sink to carry away the heat of the large surface and the side surface of the cell through the heat sink, and to achieve rapid heat dissipation of the cell. The side wall of the battery box can also not be formed with a liquid cooling flow channel, at this time, the side wall can transmit the heat of the heat sink to the liquid cooling bottom plate to cool the heat sink by the liquid cooling bottom plate, and to achieve rapid heat dissipation of the cell.

[0038] The liquid cooling bottom plate can also be formed with a liquid cooling flow channel for flowing through cooling liquid. It can be understood that the liquid cooling bottom plate can be configured with a liquid inlet and a liquid outlet. The liquid inlet is communicated with a liquid inlet pipeline, so as to inject the cooling liquid into the liquid cooling flow channel of the liquid cooling bottom plate. The liquid outlet is communicated with a liquid return pipeline, so as to deliver the cooling liquid back to the cooling liquid circulating tank.

[0039] In some embodiments, the heat sink can be made of copper material, aluminum material or other metal materials with good heat conduction performance.

[0040] The heat-conducting connection between the heat dissipation fin and the battery cell and the side wall can be direct contact or adhesion through heat-conducting glue.

[0041] As shown in FIG. 1, in some embodiments, the heat dissipation fin includes a first heat-conducting part and a second heat-conducting part. The first heat-conducting part is in heat-conducting connection with the first surface. The second heat-conducting part is arranged at an angle with the first heat-conducting part and is in heat-conducting connection with the second surface. The first heat-conducting part and the second heat-conducting part are flush with each other on the side close to the third surface. Figure 3

[0042] It can be understood that the first heat-conducting part is used for heat-conducting connection with the large surface of the battery cell, and the second heat-conducting part is used for heat-conducting connection with the side surface of the battery cell. Generally, the large surface of the square battery cell is connected perpendicularly with the side surface. Thus, the first heat-conducting part and the second heat-conducting part are also connected perpendicularly. Of course, the included angle between the first heat-conducting part and the second heat-conducting part can also be acute or obtuse to adapt to battery cells of different shapes.

[0043] The first heat-conducting part and the second heat-conducting part are integrally formed. Based on the heat dissipation fin being made of heat-conducting metal, the heat dissipation fin can be manufactured by one-piece stamping, and the first heat-conducting part and the second heat-conducting part of the heat dissipation fin are arranged at an included angle.

[0044] In some embodiments, the extension length of the first heat-conducting part is the same as the width of the large surface of the battery cell, so that the first heat-conducting part and the second heat-conducting part act on only one battery cell. Alternatively, the extension length of the first heat-conducting part is N times (N≥2) the width of the large surface of the battery cell, so that each first heat-conducting part can act on N battery cells, and the second heat-conducting part acts on the side surface of the battery cell located at the edge.

[0045] The first heat-conducting part and the second heat-conducting part are flush with each other on the side close to the third surface, i.e., the bottom surfaces of the first heat-conducting part and the second heat-conducting part are flush with each other. Thus, the manufacturing of the heat dissipation fin is facilitated.

[0046] The first heat-conducting part and the second heat-conducting part are also flush with each other on the side away from the third surface, i.e., the top surfaces of the first heat-conducting part and the second heat-conducting part are flush with each other. Thus, the manufacturing of the heat dissipation fin is facilitated.

[0047] Please continue to refer to Figure 3 In some embodiments, along the second direction, the opposite ends of the first heat-conducting part are each provided with a second heat-conducting part. The second direction is arranged at an angle with the first direction. The battery cell group includes at least two battery cells distributed along the second direction. The first heat-conducting part is in heat-conducting connection with each battery cell. The two second heat-conducting parts are respectively in heat-conducting connection with the two battery cells located at the edge.

[0048] ​It can be understood that, based on the heat conduction connection of the first heat conduction part with the large faces of the at least two battery cells, on the one hand, the first heat conduction part can play a heat transfer and heat dissipation effect to transfer the heat of the large faces of the battery cells to the side wall. On the other hand, the first heat conduction part can also play a heat equalization effect to make the temperatures of the plurality of battery cells corresponding to the first heat conduction part substantially consistent, thereby improving the temperature consistency.

[0049] The second heat conduction part is provided in two and located at opposite ends of the first heat conduction part, thereby forming a substantially U-shaped heat sink. When the first heat conduction part is in heat conduction connection with the large faces of the two battery cells, the two second heat conduction parts are in heat conduction connection with the side faces of the two battery cells away from each other, respectively. When the first heat conduction part is in heat conduction connection with the large faces of the at least three battery cells, the two second heat conduction parts are in heat conduction connection with the two battery cells located at the edges, respectively, and the side faces of the adjacent two battery cells are in abutment or spaced apart from each other.

[0050] In some embodiments, the first direction and the second direction are arranged perpendicularly. Of course, the first direction and the second direction can also be arranged at an acute angle or at an obtuse angle.

[0051] For example, the first direction is the height direction of the battery box, the second direction is the width direction of the battery box, and the third direction described below is the length direction of the battery box.

[0052] In some embodiments, the first adhesive layer is arranged between each battery cell and the first heat conduction part.

[0053] It can be understood that the first heat conduction part is bonded to the battery cells by the first adhesive layer to ensure reliable connection of the battery cells and the heat sink. The first adhesive layer can be a heat-conductive structural adhesive.

[0054] The thickness of the first adhesive layer is relatively small, which ensures a certain bonding effect and makes the battery cells and the heat sink form an integral whole. Since the heat conduction performance of the heat-conductive structural adhesive is lower than that of the heat sink, a too thick first adhesive layer will affect the heat transfer efficiency. Moreover, a too thick first adhesive layer will also affect the size of the battery module, which is not conducive to the small-size design of the battery module. For example, the thickness of the first adhesive layer can be 0.1 mm, 0.2 mm, 0.5 mm, or any value between any two of them.

[0055] In some embodiments, the first adhesive layer can cover all areas of the side of the first heat conduction part facing the battery cells, so that each position of the first heat conduction part is bonded to the battery cells to ensure the reliability of the bonding between the first heat conduction part and the battery cells.

[0056] In some embodiments, the first adhesive layer can also be arranged between the side face of the battery cell located at the edge and the second heat conduction part, so that the second heat conduction part is also bonded to the battery cell by the first adhesive layer to ensure reliable connection of the battery cell and the heat sink.

[0057] The first adhesive layer can cover all areas of the second thermally conductive part facing the battery cell, so that each position of the second thermally conductive part can be bonded to the battery cell, thereby ensuring the reliability of the bond between the second thermally conductive part and the battery cell.

[0058] like Figure 3 As shown, in some embodiments, the distance between the first heat-conducting part and the third surface along the first direction is L1, satisfying: 4 mm ≤ L1 ≤ 8 mm.

[0059] It is understandable that the distance L1 between the first heat-conducting part and the third surface in the first direction is the distance between the heat sink and the liquid cooling base plate after the battery module is assembled in the battery box. Setting this distance L1 between 4 mm and 8 mm can ensure that the heat sink and the liquid cooling base plate are spaced apart, and also ensure that there is a sufficiently large heat transfer area between the heat sink and the battery cell.

[0060] When the distance L1 between the first heat-conducting part and the third surface in the first direction is less than 4 mm, if they are all at the maximum tolerance value during the manufacturing stages of the heat sink, battery cell, battery box, etc., it may cause the heat sink to contact the liquid cooling base plate after the battery module is assembled into the battery box, which will affect the heat dissipation effect of the liquid cooling base plate on the bottom surface of the battery cell.

[0061] When the distance L1 between the first heat-conducting part and the third surface in the first direction is greater than 8 mm, the contact area between the heat sink and the battery cell will be small, resulting in a smaller effective area of ​​the heat sink and a poorer heat dissipation and heat equalization capacity of the battery cell.

[0062] In some embodiments, the distance L1 between the first heat-conducting part and the third surface in the first direction can be set to 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or any value between the two.

[0063] Please continue reading. Figure 3 In some embodiments, the battery cell assembly further includes a fourth surface. The fourth surface is disposed opposite to the third surface. The fourth surface is configured with terminals. Each terminal has an end face away from the fourth surface. The heat sink is spaced apart from the end face along a first direction.

[0064] Understandably, the fourth surface is the top surface of the battery cell, which typically has terminals. These terminals facilitate current conduction, ensuring normal current flow during charging and discharging. The heat sink and terminals are spaced apart to prevent electrical connections between them, which could cause short circuits or leakage, thus ensuring safe electricity use.

[0065] Please continue reading. Figure 3In some embodiments, the distance between the heat dissipation fin and the end face in the first direction is D1. The creepage distance between the heat dissipation fin and the end face is D2. It is satisfied that D1≥D2.

[0066] It can be understood that the distance D1 between the heat dissipation fin and the end face is greater than or equal to the creepage distance D2 between the heat dissipation fin and the end face, so that the insulation between the heat dissipation fin and the pole can be ensured, and the short circuit, leakage and other phenomena caused by the electrical connection between the heat dissipation fin and the pole can be prevented.

[0067] For example, when the voltage of the battery pack is about 300 volts, the creepage distance D2 between the heat dissipation fin and the end face is about 10 mm. At this time, the distance D1 between the heat dissipation fin and the end face is set to be greater than or equal to 10 mm. For example, the distance D1 between the heat dissipation fin and the end face is set to be 10 mm, 11 mm, etc.

[0068] In some embodiments, the thickness of the heat dissipation fin is D3, and it is satisfied that 0.5 mm≤D3≤1 mm.

[0069] It can be understood that when the thickness of the heat dissipation fin is less than 0.5 mm, the strength of the heat dissipation fin will be too low, and the heat dissipation fin will be easily deformed, so that the heat dissipation fin is not easy to assemble with the battery cell. When the thickness of the heat dissipation fin is greater than 1 mm, on the one hand, too much space will be occupied in the battery box, and on the other hand, the cost of the heat dissipation fin will be increased, and the weight will be increased, which is not conducive to low cost and lightweight design.

[0070] For example, the thickness D3 of the heat dissipation fin is set to be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or any value between any two of them.

[0071] As shown in Figure 1 and Figure 2 The application also provides a battery pack. The battery pack comprises a box body and a battery module as in the foregoing embodiments. The battery module is arranged in the box body.

[0072] In the embodiments of the application, the heat of the first surface and the second surface of the battery cell is transmitted to the side wall of the battery box through the heat dissipation fin, and the side wall itself is used for heat dissipation or the heat is transmitted to the liquid cooling bottom plate through the side wall for heat dissipation, so that the side surface of the battery cell is evenly heated and cooled, and the heat of the battery cell is quickly discharged. The heat dissipation fin is spaced apart from the third surface, and when the battery module is assembled in the battery box, the heat dissipation fin is spaced apart from the liquid cooling bottom plate and does not directly contact the liquid cooling bottom plate, so that the cooling capacity of the liquid cooling bottom plate is first applied to the bottom surface of the battery cell, and the consistency of the temperature of the battery cell is ensured.

[0073] As shown in Figure 1 and Figure 2As shown, in some embodiments, at least two battery cell groups are arranged sequentially along a third direction within the casing. The third direction is angled relative to the first direction. Each pair of adjacent heat sinks is spaced apart.

[0074] Understandably, by placing multiple cell groups inside the casing, connected in series or parallel, to form a battery pack, it can be used in vehicles and other transportation vehicles, or in other products requiring energy storage. The spacing between adjacent heat sinks ensures that the battery module can be assembled into the casing, preventing adjacent heat sinks from pressing against each other and interfering with the assembly of the battery module.

[0075] At least two battery cell groups arranged sequentially along a third direction can be bonded together using thermally conductive structural adhesive. After bonding, they are assembled into the enclosure as a whole. Alternatively, adjacent battery cell groups can be unbonded, with each battery cell group being assembled into the enclosure sequentially. After all battery cell groups are assembled into the enclosure, thermally conductive structural adhesive is applied to bond the heat sink to the side wall of the enclosure.

[0076] In some embodiments, the battery cell packs located at the third-party ends can also be bonded to the uprights inside the battery box via foam.

[0077] like Figure 4 As shown, in some embodiments, the spacing between every two adjacent heat sinks is L2, satisfying the condition: 3 mm ≤ L2 ≤ 5 mm.

[0078] Understandably, if the spacing L2 between any two adjacent heat sinks is less than 3 mm, manufacturing tolerances of the heat sinks, battery cells, and casing may prevent the battery module from being assembled into the casing. If the spacing L2 between any two adjacent heat sinks is greater than 5 mm, it will result in excessive thermally conductive adhesive filling the space between the two heat sinks. This will increase the cost of the thermally conductive adhesive and create an excessively long heat transfer path between the two heat sinks. Since the thermal conductivity of the thermally conductive adhesive is much lower than that of the heat sink, an excessively long heat transfer path will be detrimental to the even heat distribution between the two adjacent battery modules.

[0079] For example, the spacing L2 between any two adjacent heat sinks can be set to 3 mm, 4 mm, or 5 mm, or any value between the two.

[0080] In some embodiments, the enclosure includes sidewalls. A second adhesive layer is provided between the heat sink and the sidewall.

[0081] Understandably, the battery cells in the battery module are connected to the heat sink via a first adhesive layer, bonding them together as a single unit. The heat sink of the battery module is then bonded to the sidewall via a second adhesive layer, ensuring that the battery module is reliably fixed within the casing and its position remains stable.

[0082] The second glue layer is a heat-conducting structural glue, so that the second glue layer also has certain heat-conducting capacity, and ensures that heat can be transmitted to the side wall.

[0083] The above detailed description is made to the embodiments of the present application, and the principle and implementation mode of the present application are described by applying specific examples, and the above embodiment description is only used to help understand the method and core idea of the present application; meanwhile, for the skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A battery module, characterized by, The application relates to a battery module. The battery module comprises: a battery cell group having a first surface, a second surface and a third surface adjacent to each other, the battery cell group comprising at least one battery cell, the third surface being located on a side of the battery cell group facing a liquid cooling bottom plate of a battery box; 2. The battery module of claim 1, wherein, a heat sink in thermal contact with the first surface and the second surface, wherein the heat sink is configured to be in thermal contact with a side wall of the battery box, and the heat sink is spaced apart from the third surface in a first direction. The heat sink comprises: a first thermal conduction part in thermal contact with the first surface; a second thermal conduction part arranged at an angle with the first thermal conduction part, the second thermal conduction part being in thermal contact with the second surface; 3. The battery module of claim 2, wherein, wherein the first thermal conduction part and the second thermal conduction part are flush with a side of the third surface.

4. The battery module of claim 3, wherein, In a second direction, the opposite ends of the first thermal conduction part are each provided with the second thermal conduction part, wherein the second direction is arranged at an angle with the first direction, the battery cell group comprises at least two battery cells distributed along the second direction, the first thermal conduction part is in thermal contact with each of the battery cells, and the two second thermal conduction parts are in thermal contact with the two battery cells located at the edges, respectively.

5. The battery module of claim 2, wherein, A first adhesive layer is arranged between each of the battery cells and the first thermal conduction part.

6. The battery module of any one of claims 1-5, wherein, In the first direction, the distance between the first thermal conduction part and the third surface is L1, which satisfies 4mm <= L1 <= 8mm.

7. The battery module of claim 6, wherein, The battery cell group further has a fourth surface arranged opposite to the third surface, the fourth surface is configured with a pole, and the pole has an end face away from the fourth surface, wherein in the first direction, the heat sink is spaced apart from the end face.

8. The battery module of any one of claims 1-5, wherein, In the first direction, the distance between the heat sink and the end face is D1, and the creepage distance between the heat sink and the end face is D2, which satisfies D1 >= D2.

9. A battery pack, characterized by, The thickness of the heat sink is D3, which satisfies 0.5mm <= D3 <= 1mm. The application further relates to a battery box. The battery module is arranged in the battery box. The battery box is provided with at least two battery cell groups distributed along a third direction, wherein the third direction is arranged at an angle with the first direction, and each of the adjacent heat sinks is spaced apart.

10. The battery pack of claim 9, wherein, The distance between each of the adjacent heat sinks is L2, which satisfies 3mm <= L2 <= 5mm.

11. The battery pack of claim 10, wherein, The battery box comprises a side wall, and a second adhesive layer is arranged between the heat sink and the side wall.

12. The battery pack of claim 9, wherein, ​

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