Cooling part, battery module and battery pack

Abstract

The utility model provides a cooling piece, a battery module and a battery pack, the battery module comprises the cooling piece, the cooling piece comprises a plurality of side surfaces, and at least one side surface is provided with at least one accommodating groove; at least one flow channel is further arranged in the cooling plate, and the flow channel penetrates from one side of the cooling piece to the other side of the cooling piece; and at least one battery is configured to be accommodated in one accommodating groove, the arrangement direction of the at least two batteries is the same as the extension direction of the flow channel, and at least one part of the outer surface of the battery is configured to be in contact with the inner wall where the flow channel is located.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a cooling component, a battery module and a battery pack. Background Art

[0002] In related technologies, the cooling structure of the batteries inside a battery pack is usually arranged at the bottom of the battery module, the pole columns of the batteries are located at the top of the battery module, and the cooling structure is configured to only be able to contact the bottom of the batteries, so that the heat dissipation area of the batteries is small, and the overall heat dissipation effect of the battery module is poor.

[0003] Moreover, the above liquid cooling structure is large in volume and heavy in weight, but only has a heat exchange effect. Multiple batteries in the battery module usually need to be fixed by means of the structure of a bracket or an end plate, further resulting in a large weight of the entire battery pack and a low mass energy density. Summary of the Utility Model

[0004] Embodiments of the utility model provide a cooling component, a battery module and a battery pack, which can improve the technical problem of low mass energy density of the battery pack in related technologies.

[0005] In a first aspect, embodiments of the utility model provide a battery module, including:

[0006] A cooling component, including a plurality of side surfaces, at least one receiving groove is arranged on at least one of the side surfaces; at least one flow channel is further arranged inside the cooling plate, and the flow channel penetrates from one side of the cooling component to the other side of the cooling component;

[0007] At least two batteries, at least one of the batteries is configured to be received in one of the receiving grooves, the arrangement directions of the at least two batteries are the same as the extending direction of the flow channel, and at least a part of the outer surface of the battery is configured to contact the inner wall where the flow channel is located.

[0008] In some embodiments, the plurality of side surfaces of the cooling component include opposite first side surface and second side surface, and opposite third side surface and fourth side surface. The third side surface and the fourth side surface are arranged between the first side surface and the second side surface. The flow channel penetrates the third side surface and the fourth side surface. At least two receiving grooves are arranged on the first side surface and / or the second side surface, and the area of the first side surface or the second side surface is larger than the area of the third side surface or the fourth side surface.

[0009] In some embodiments, a plurality of receiving parts are arranged on both the first side surface and the second side surface of the cooling component. The receiving part protrudes relative to the first side surface or the second side surface. The inner cavity of the receiving part is set as the receiving groove, and an opening is arranged at the top of the receiving part. The battery is inserted into the receiving groove through the opening.

[0010] In some embodiments, the extending direction of the receiving groove is the same as the height direction of the battery, and the height of the part of the battery received in the receiving groove occupies at least half of the total height of the battery.

[0011] In some embodiments, the battery is configured as a square battery. The battery includes opposite first and second sides, and opposite third and fourth sides. The surface area of the first side or the second side is larger than the surface area of the third side or the fourth side, and the first side or the second side is configured to contact the inner wall where the flow channel is located.

[0012] In some embodiments, at least two of the batteries include a first battery group and a second battery group. At least one row of the receiving grooves is provided on both the first side and the second side of the cooling member. The first battery group is received in one row of the receiving grooves on the first side, and the second battery group is received in one row of the receiving grooves on the second side.

[0013] In some embodiments, the cooling member is configured as a serpentine cooling plate, the battery is configured as a cylindrical battery, a plurality of grooves are provided on the first side or the second side of the cooling member, and a plurality of receiving portions are further provided on the first side or the second side of the cooling member. The inner cavity of the receiving portion and the grooves together form the receiving groove for the cylindrical battery.

[0014] In some embodiments, the interval between two adjacent receiving portions is set to be 50 mm to 100 mm.

[0015] In some embodiments, the flow channel is provided with an inlet and an outlet. The inlet is for the cooling medium to flow in, and the outlet is for the circulating medium to flow out. The inlet is located on the third side, the outlet is located on the fourth side, and the cross-sectional area of the inlet is smaller than the cross-sectional area of the outlet.

[0016] In some embodiments, along the direction from the inlet to the outlet, the cross-section of the flow channel is configured to gradually increase; and / or, along the direction from the inlet to the outlet, the inner wall where the flow channel is located gradually thins.

[0017] In a second aspect, an embodiment of the present invention provides a cooling member. The cooling member is used to cool the battery. The cooling member includes a plurality of sides. At least one receiving groove is provided on at least one of the sides. The inside of the receiving groove is used to receive at least one battery; at least one flow channel is further provided inside the cooling member. The flow channel penetrates from one side of the cooling member to the other side of the cooling member, and the inner wall where the flow channel is located defines a part of the receiving groove.

[0018] In a third aspect, an embodiment of the present utility model provides a battery pack, which includes a box body and a plurality of battery modules disposed inside the box body, and the battery modules include the above-mentioned battery modules.

[0019] Advantageous effects of the embodiment of the present utility model:

[0020] In the embodiment of the present utility model, by directly accommodating the battery in the accommodating groove on the cooling member, the battery module can omit the fixing structure of the battery, which is beneficial to the lightweight design of the battery pack and helps to improve the mass energy density of the battery pack. Further, since the battery is directly fixed in the accommodating groove on the cooling member and the flow channel runs through the entire cooling member, the part of the battery accommodated in the accommodating groove can fully exchange heat with the cooling medium in the flow channel. Compared with only exchanging heat at the bottom of the battery, fixing the battery directly on one side of the cooling member can improve the heat exchange effect more effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 is a three-dimensional structural schematic diagram of the battery module provided by the embodiment of the present utility model;

[0023] Figure 2 is a three-dimensional structural schematic diagram of the battery module from another angle provided by the embodiment of the present utility model;

[0024] Figure 3 is a three-dimensional structural schematic diagram of the cooling member provided by the embodiment of the present utility model;

[0025] Figure 4 is an exploded view of the battery module provided by the embodiment of the present utility model;

[0026] Figure 5 is a three-dimensional structural schematic diagram of the battery module provided by another embodiment of the present utility model;

[0027] Figure 6 is a top view structural diagram of the battery module provided by the embodiment of the present utility model;

[0028] Figure 7 is a sectional view of the cooling member provided by the embodiment of the present utility model;

[0029] Figure 8It is a schematic structural diagram of the arrangement of battery modules in a battery pack provided by an embodiment of the present utility model;

[0030] Reference numerals in the drawings:

[0031] 10. Battery module; 1. Battery; 11. First battery group; 12. Second battery group; 131. First side of the battery; 132. Second side of the battery; 133. Third side of the battery; 134. Fourth side of the battery; 2. Cooling member; 211. First side of the cooling member; 212. Second side of the cooling member; 213. Third side of the cooling member; 214. Fourth side of the cooling member; 22. Flow channel; 221. Inlet; 222. Outlet; 23. Receiving portion; 24. Receiving groove; 25. Opening; 26. Groove; Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the drawings; and "inner" and "outer" refer to the outline of the device.

[0033] An embodiment of the present application provides a battery pack, which includes a box body and a plurality of battery modules, and the plurality of battery modules are arranged inside the box body. The battery pack can be a power battery pack or an energy storage battery pack.

[0034] In the related art, the battery pack further includes a cooling structure, and the cooling structure is usually set as a cooling plate. The cooling plate is arranged at the bottom of the battery module, and the pole column of the battery is located at the top of the battery module. The cooling plate is configured to only be in contact with the bottom of the battery, so that the heat dissipation area of the battery is small, and the overall heat dissipation effect of the battery module is poor. Moreover, the above liquid cooling structure has a large volume and a heavy weight, but only has a heat exchange effect.

[0035] The battery module usually further has a battery fixing structure. The battery fixing structure can be a battery bracket, and the battery bracket is provided with holes for fixing the battery. Or the battery fixing structure can also be an end plate, and the end plate is fixed at both ends of the battery module, and the battery module is circumferentially bundled by a steel belt to maintain the stability of the overall structure of the battery module.

[0036] Since a cooling structure and a battery fixing structure are both provided inside the battery pack, the weight of the battery pack is relatively large, but the mass energy density of the battery pack is relatively low.

[0037] In the embodiments of the present application, by improving the structure of the battery module, the technical problems of poor heat exchange effect and low mass energy density of the battery module are synchronously improved.

[0038] Reference Figures 1 to 3 , the battery module 10 includes a plurality of batteries 1 and a cooling member 2, and the cooling member 2 is used to provide fixation and cooling for the plurality of batteries 1.

[0039] The cooling member 2 includes a plurality of side surfaces. Taking the cooling plate as an example, the cooling member 2 includes opposite first side surface 211 and second side surface 212, and opposite third side surface 213 and fourth side surface 214. The third side surface 213 and the fourth side surface 214 are located between the first side surface 211 and the second side surface 212. At least one receiving groove 24 is provided on at least one of the side surfaces.

[0040] At least one flow channel 22 is further provided inside the cooling member 2. The flow channel 22 penetrates from one side of the cooling member 2 to the other side of the cooling member 2, and the flow channel 22 is used for the cooling medium to flow through.

[0041] The battery 1 is received in the receiving groove 24. The battery 1 can be one of a cylindrical battery or a square battery. The battery 1 can be at least one of a lithium-ion battery, a nickel-metal hydride battery, a lead-acid battery, a lithium cobalt oxide battery, a lithium iron phosphate battery, a ternary lithium battery, a sodium salt battery, a flow battery, and a solid-state battery.

[0042] Since the battery 1 is directly received in the receiving groove 24 on the cooling member 2, the battery module 10 can omit the battery fixing structure, which is beneficial to the lightweight design of the battery pack and helps to improve the mass specific energy of the battery pack. Further, since the battery 1 is directly fixed in the receiving groove 24 on the cooling member 2 and the flow channel 22 is provided through the entire cooling member 2, the part of the battery 1 received in the receiving groove 24 can perform sufficient heat exchange with the cooling medium in the flow channel 22. Compared with only performing heat exchange on the bottom of the battery, directly fixing the battery 1 on one of the side surfaces of the cooling member 2 can improve the heat exchange effect more effectively.

[0043] In a preferred embodiment, the surface area of the first side surface 211 or the second side surface 212 is larger than the surface area of the third side surface 213 or the fourth side surface 214. The flow channel 22 penetrates the third side surface 213 and the fourth side surface 214, and the receiving groove 24 is provided on the first side surface 211 or the second side surface 212, or the receiving groove 24 is provided on both the first side surface 211 and the second side surface 212 simultaneously.

[0044] By fixing the battery 1 on the first side surface 211 or the second side surface 212 with a larger surface area, it is beneficial to arrange a larger number of batteries 1 on each cooling member 2, thereby increasing the battery capacity of a single battery module 10.

[0045] In a preferred embodiment, continue to refer to Figures 1 to 3 , a plurality of receiving portions 23 are arranged on both the first side surface 211 and the second side surface 212 of the cooling member 2. The receiving portion 23 protrudes relative to the first side surface 211 or the second side surface 212. The inner cavity of the receiving portion 23 is arranged as a receiving groove 24. An opening 25 is arranged at the top of the receiving portion 23, and the battery 1 is inserted into the receiving groove 24 through the opening 25.

[0046] By arranging an opening 25 at the top of each receiving groove 24, it is convenient for the battery 1 to be quickly inserted into the receiving groove 24.

[0047] In other alternative examples, the receiving groove 24 can be formed by being concave relative to the outer surface of the cooling member 2. For a square battery, if the receiving groove 24 is formed by being concave, the inner wall where the internal flow channel 22 of the cooling member 2 is located is provided with an uneven structure, which is not conducive to the rapid flow of the cooling medium. Further, the receiving portion 23 of the battery 1 is arranged as a protruding structure. While maintaining the smoothness of the flow channel 22, the way of directly inserting the battery 1 through the opening 25 is faster than the way of pressing it into the groove, improving the grouping efficiency of the battery module 10.

[0048] In summary, for a square battery, the cooling member 2 is preferably arranged as a flat plate-like structure, and a plurality of protruding receiving portions 23 are arranged on its outer surface.

[0049] In order to further stably hold the battery 1 in the receiving groove 24, glue can be further coated on the bottom and the outer surface of the battery 1. By means of this glue, the battery 1 can be stably received in the receiving groove 24.

[0050] In a further preferred embodiment, the longitudinal extension direction of the receiving portion 23 is the same as the height direction of the battery 1. The inventor found through research that the height portion of the battery 1 received in the receiving groove 24 occupies more than half of the total height of the battery 1, so that the battery 1 can be stably received in the receiving groove 24 even after long-term use. It can be understood that in the early stage of the use of the battery 1, the battery 1 can be stably received in the receiving groove 24 by means of high-viscosity glue. After the battery 1 is used for a period of time, the viscosity of the glue bonded to the outer surface of the battery 1 decreases, resulting in loosening between the battery 1 and the receiving portion 23. If the depth of the battery 1 embedded in the receiving portion 23 is less than more than half of its own height, the battery 1 is likely to loosen from the receiving groove 24 in a bumpy external environment, thus affecting the heat exchange between the battery 1 and the inner cavity of the cooling member 2.

[0051] In a further preferred embodiment, the height of the receiving portion 23 is basically equal to the height of the battery 1, so that all parts of the battery 1 except the pole posts are received in the receiving portion 23, further improving the stability of the battery 1 fixed in the receiving groove 24. And when the cooling member 2 is subjected to external force bumps, since the height direction of the battery 1 is consistent with the height direction of the receiving portion 23 of the cooling member 2, the battery 1 is subjected to the action of gravity and can be stably received in the receiving groove 24.

[0052] Reference Figure 4 , the battery 1 is set as a square battery. The battery 1 includes opposite first side surfaces 131, second side surfaces 132, and opposite third side surfaces 133 and fourth side surfaces 134. The surface area of the first side surface 131 or the second side surface 132 of the battery 1 is larger than the surface area of the third side surface 133 or the fourth side surface 134. The first side surface 131 or the second side surface 132 of the battery 1 is configured to contact the inner wall where the flow channel 22 is located.

[0053] By setting the first side surface 131 or the second side surface 132 with a larger surface area of the battery 1 to contact the inner wall where the internal flow channel 22 of the cooling member 2 is located, large-area heat dissipation can be achieved, and the heat exchange effect of the battery 1 is fully improved.

[0054] Continue to refer to Figure 3 and Figure 4 , at least two batteries 1 include a first battery group 11 and a second battery group 12. At least one row of receiving grooves 24 are provided on the first side surface 211 and the second side surface 212 of the cooling member 2. The first battery group 11 is received in at least one row of receiving grooves 24 on the first side surface 211 of the cooling member 2, and the second battery group 12 is received in at least one row of receiving grooves 24 on the second side surface 212 of the cooling member 2.

[0055] By simultaneously arranging the first battery pack 11 and the second battery pack 12 on the opposite sides of a single cooling member 2, while increasing the capacity of the battery module 1, the heat exchange efficiency can also be fully improved, and it is beneficial to maintain the temperature uniformity of the first battery pack 11 and the second battery pack 12, thereby maintaining the overall temperature uniformity of the battery module 1.

[0056] Referring to Figure 5 , in another embodiment provided by the present application, the cooling member 2 is arranged as a serpentine cooling plate, the battery 1 is arranged as a cylindrical battery, and a plurality of grooves 26 are arranged on the first side surface 211 or the second side surface 212 of the cooling member 2. A plurality of receiving portions 23 are further arranged on the outer side surface of the cooling member 2. The receiving portion 23 protrudes relative to the first side surface 211 or the second side surface 212 of the cooling member 2. The inner cavity of the receiving portion 23 and the groove 26 together define a receiving groove 24 for the battery 1.

[0057] By embedding a part of the cylindrical battery 1 into the groove 26 and the other part of the cylindrical battery 1 is received in the inner cavity of the receiving portion 23, the cylindrical battery 1 can be stably held in the receiving groove 24.

[0058] Continuing to refer to Figure 6 and Figure 7 , the interval d between two adjacent receiving portions 23 is set to 50 mm to 100 mm. The inventor found through research that by setting the interval d between two adjacent receiving portions 23 to 50 mm to 100 mm, the temperature difference range of the entire battery module 10 can be controlled within 1°C. It can be understood that the batteries 1 are arranged along the extending direction of the flow channel 22. After the cooling medium exchanges heat with the battery 1 near the inlet 221 of the flow channel 22, the temperature of the cooling medium will gradually increase. If the interval d between two adjacent receiving portions 23 is greater than 100 mm, the heat exchange effect of the battery 1 near the inlet 221 of the flow channel 22 is better, while the heat exchange effect of the battery 1 far from the inlet 221 of the flow channel 22 is worse, which will lead to a large difference in the overall temperature difference range of the battery module 1. Further, if the interval d between two adjacent receiving portions 23 is greater than 100 mm, it is also not conducive to improving the mass energy density of the battery module 1. If the interval d between two adjacent receiving portions 23 is less than 50 mm, the interval between two adjacent batteries 1 will be too close, which is not conducive to heat dissipation. In a specific implementation, the interval between two adjacent receiving portions 23 can be 50 mm, 55 mm, 56 mm, 60 mm, 62 mm, 68 mm, 70 mm, 78 mm, 80 mm, 87 mm, 90 mm, 96 mm, 100 mm and the values between any two of the above, or the range between any two of the above values.

[0059] Continuing to refer to Figure 7, the flow channel 22 is provided with an inlet 221 and an outlet 222. The inlet 221 is for the cooling medium to flow in, and the outlet 222 is for the circulating medium to flow out. The inlet 221 is located on the third side surface 213 of the cooling member 2, and the outlet 222 is located on the fourth side surface 214 of the cooling member 2. Among them, the cross-sectional area of the inlet 221 is smaller than that of the outlet 222.

[0060] By setting the flow channel 22 to have a structure of a small inlet 221 and a large outlet 222, it is convenient for the cooling medium to fully exchange heat with different positions of the battery 1 after entering the flow channel 22, so as to balance the temperatures at different positions of the battery 1.

[0061] In a further preferably implementation, along the direction from the inlet 221 to the outlet 222, the cross-sectional area of the flow channel 22 is configured to gradually increase.

[0062] Since after the liquid cooling medium enters the flow channel from the inlet 221, the temperature of the cooling medium gradually rises after the cooling medium exchanges heat with the battery 1 near the inlet 221. By configuring the cross-sectional area of the flow channel 22 to gradually increase, the flow rate of the cooling medium gradually increases as the cross-sectional area of the flow channel 22 increases, so that there is a larger contact area between the battery 1 far from the inlet 221 and the flow channel 22, thus improving the problem of poor heat exchange effect between the cooling medium and the battery 1 at the distal end after the temperature of the cooling medium rises, and further improving the temperature uniformity of the battery module 10.

[0063] In a further preferably implementation, along the direction from the inlet 221 to the outlet 222, the inner wall where the flow channel 22 is located gradually thins.

[0064] By adjusting the thickness of the inner wall where the flow channel 22 is located, the inner wall between the battery 1 at the distal end and the flow channel 22 thins, enabling more sufficient heat exchange between the battery 1 at the distal end and the cooling medium inside the flow channel 22, with higher heat exchange efficiency, thereby reducing the temperature difference between the battery 1 at the distal end and the cooling medium inside the flow channel 22, and further making the temperature of the battery 1 at the distal end closer to that of the battery 1 at the proximal end, and further improving the temperature uniformity of the battery module 10.

[0065] Continue to refer to Figure 8 , in the embodiment provided in the present application, the battery pack includes a plurality of battery modules 10, and the plurality of battery modules 10 are configured to be formed by arranging a plurality of cooling members 2 in a matrix. Compared with the method of arranging more batteries 1 on a single cooling member 2, setting a plurality of cooling members 2 is beneficial to improving the temperature uniformity of a single battery module 10.

[0066] The above has introduced the embodiments of the present utility model in detail. Specific examples are used in this text to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A battery module, characterized in that: include: The cooling element comprises a plurality of side surfaces, at least one of the side surfaces is provided with at least one receiving groove; at least one flow channel is also provided inside the cooling element, and the flow channel runs from one side of the cooling element to the other side of the cooling element; At least one battery, at least one of the batteries is configured to be received in one of the receiving slots, and at least a portion of the outer surface of the battery is configured to contact the inner wall where the flow channel is located.

2. The battery module according to claim 1, characterized in that: The multiple side surfaces of the cooling component include a relative first side surface, a second side surface, and a relative third side surface and a fourth side surface, the third side surface and the fourth side surface are arranged between the first side surface and the second side surface, the flow channel runs through the third side surface and the fourth side surface, at least two receiving grooves are arranged on the first side surface and / or the second side surface, and the area of ​​the first side surface or the second side surface is larger than the area of ​​the third side surface or the fourth side surface.

3. The battery module according to claim 2, characterized in that: The first side surface and the second side surface of the cooling member are both provided with a plurality of receiving parts, the receiving part is protruding relative to the first side surface or the second side surface, the inner cavity of the receiving part is provided as the receiving groove, the top of the receiving part is provided with an opening, and the battery is inserted into the receiving groove through the opening.

4. The battery module according to claim 1, characterized in that: The extending direction of the receiving groove is the same as the height direction of the battery, and the height of the portion of the battery received in the receiving groove occupies at least half of the overall height of the battery.

5. The battery module according to claim 3, characterized in that: The battery is configured as a square battery, and the battery includes a first side surface, a second side surface, and a third side surface and a fourth side surface relative to each other, the surface area of ​​the first side surface or the second side surface is greater than the surface area of ​​the third side surface or the fourth side surface, and the first side surface or the second side surface is configured to contact the inner wall where the flow channel is located.

6. The battery module according to claim 5, characterized in that: At least two of the batteries include a first battery group and a second battery group. The first side surface and the second side surface of the cooling element are both provided with at least one row of receiving grooves. The first battery group is received in a row of receiving grooves on the first side surface, and the second battery group is received in a row of receiving grooves on the second side surface.

7. The battery module according to claim 2, characterized in that: The cooling member is configured as a serpentine cooling plate, the battery is configured as a cylindrical battery, a plurality of grooves are provided on the first side surface or the second side surface of the cooling member, a plurality of receiving parts are also provided on the first side surface or the second side surface of the cooling member, and the inner cavity of the receiving part and the grooves together form the receiving groove of the cylindrical battery.

8. The battery module according to claim 3 or 7, characterized in that: The interval between two adjacent receiving parts is set to 50 mm to 100 mm.

9. The battery module according to claim 2, characterized in that: The flow channel is provided with an inlet and an outlet, the inlet is for cooling medium to flow in, and the outlet is for circulating medium to flow out, the inlet is located on the third side, and the outlet is located on the fourth side, and the cross-sectional area of ​​the inlet is smaller than the cross-sectional area of ​​the outlet.

10. The battery module according to claim 9, characterized in that: Along the direction from the inlet to the outlet, the cross section of the flow channel is configured to gradually increase; and / or, along the direction from the inlet to the outlet, the inner wall where the flow channel is located gradually becomes thinner.

11. A cooling element for cooling a battery, characterized in that: The cooling member includes a plurality of side surfaces, at least one of the side surfaces is provided with at least one receiving groove, the interior of the receiving groove is used to receive at least one battery; at least one flow channel is also provided inside the cooling member, the flow channel runs from one side of the cooling member to the other side of the cooling member, and the inner wall where the flow channel is located defines a portion of the receiving groove.

12. A battery pack, characterized in that: The battery pack includes a box body and a plurality of battery modules arranged inside the box body, and the battery modules include the battery modules according to any one of claims 1-10.

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