Battery module and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery module and a battery pack, the battery module comprises a cooling plate, a heat conduction assembly and a battery cell, the plurality of battery cells are sequentially arranged on one side of the cooling plate along a preset direction and are connected through connecting pieces; the heat conduction assembly comprises a soaking plate, the soaking plate comprises a clamping part and a heat conduction part, the clamping part is clamped between the side surfaces of two adjacent battery cells, the heat conduction part is connected to one end, close to the cooling plate, of the clamping part, and the cross sectional area of the heat conduction part in the direction parallel to the cooling plate is larger than that of the clamping part in the direction parallel to the cooling plate; one side of the heat-conducting part deviating from the clamping part is in heat-conducting connection with the cooling plate. The battery module is good in heat transfer uniformity, and the temperature consistency of the battery cells can be effectively guaranteed.

Description

Technical Field

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

[0002] The power battery pack is the research and development core of electrochemical energy storage products. The battery pack is formed by a combination of multiple battery modules.

[0003] To maintain optimal operating temperatures within the battery module, conventional cooling methods typically utilize air or liquid cooling to dissipate heat from the battery cells, using air or liquid as a heat transfer medium. Liquid cooling can be categorized into two types: direct contact and indirect contact. Direct contact involves directly immersing the battery cells or modules in liquid for cooling, while indirect contact involves indirectly cooling the battery cells through the use of cooling channels or cold plates.

[0004] Both of the above cooling methods have defects: air cooling has low heat dissipation efficiency and is prone to insufficient heat dissipation in high-temperature environments. There are also problems such as high noise and low temperature consistency. Direct contact heat dissipation in liquid cooling, such as immersion cooling, has problems of high cost and poor safety. Indirect contact heat dissipation is greatly affected by the flow channel and the cold plate's own structure. At the same time, both methods face problems such as poor temperature consistency.

[0005] Therefore, there is an urgent need to provide a battery module and a battery pack to solve the above problems. Utility Model Content

[0006] One purpose of the present invention is to provide a battery module with good heat transfer uniformity, which can effectively ensure the temperature consistency of the battery cells.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] Battery module, including:

[0009] cooling plate;

[0010] A plurality of battery cells, wherein the plurality of battery cells are sequentially arranged on one side of the cooling plate along a preset direction and connected by a connector;

[0011] The heat conducting component includes a heat spreader, which includes a clamping portion and a heat conducting portion. The clamping portion is clamped between the side surfaces of two adjacent battery cells, and the heat conducting portion is connected to one end of the clamping portion close to the cooling plate. The cross-sectional area of ​​the heat conducting portion in a direction parallel to the cooling plate is larger than the cross-sectional area of ​​the clamping portion in a direction parallel to the cooling plate. The side of the heat conducting portion facing away from the clamping portion is thermally connected to the cooling plate.

[0012] Optionally, the step surfaces on both sides of the connection between the heat conducting portion and the clamping portion respectively abut against the top corners of the two battery cells.

[0013] Optionally, the clamping portion fits into the side surfaces of the two adjacent battery cells with the largest areas.

[0014] Optionally, the heat-conducting assembly further includes a heat-transferring member and a heat-conducting structure, wherein the heat-transferring member is connected to the end face of the heat-conducting portion facing away from the clamping portion, the cross-sectional area of ​​the heat-transferring member is larger than the cross-sectional area of ​​the heat-conducting portion, and the heat-conducting structure is arranged on one side of the heat-transferring member.

[0015] Optionally, the heat-conducting structure includes a first heat-conducting structure, which is disposed between the heat transfer element and the cooling plate, and two sides of the first heat-conducting structure are tightly fitted to the heat transfer element and the cooling plate; and / or,

[0016] The heat-conducting structure further includes a second heat-conducting structure, which is arranged on a side of the heat-conducting member facing the battery core. Part of the heat-conducting portion passes through the second heat-conducting structure and abuts against the heat-conducting member.

[0017] Optionally, the first heat-conducting structure is a heat-conducting structural adhesive; and / or,

[0018] The second heat-conducting structure is a heat-conducting structural adhesive.

[0019] Optionally, the plurality of battery cells are arranged in parallel along the first direction, and the positive electrodes and negative electrodes of two adjacent battery cells are facing each other; and / or,

[0020] The plurality of battery cells are arranged side by side along a second direction, the polarities of two adjacent battery cells on the same side are different, and the second direction is perpendicular to the first direction.

[0021] Optionally, a plurality of flow channels are provided inside the cooling plate, and two adjacent flow channels are connected to each other.

[0022] Optionally, a water inlet pipe and a water outlet pipe are spaced apart on one side of the cooling plate, and both the water inlet pipe and the water outlet pipe are connected to the flow channel.

[0023] Optionally, the water inlet pipe and the water outlet pipe are both provided with a connecting portion, the connecting portion extends toward the battery core, and the connecting portion is configured to communicate with an external pipeline.

[0024] Optionally, the heat spreader is a heat pipe structure.

[0025] Optionally, the heat conduction part includes a shell, a liquid wick and a support column, and a closed heat transfer space is provided in the shell. The heat transfer space includes a connected condensation end and an evaporation end. The liquid wick is attached to the inner wall of the heat transfer space, a part of the liquid wick is located at the condensation end, and the other part is located at the evaporation end. The support column is supported in the heat transfer space and is perpendicular to the liquid wick.

[0026] Another object of the present invention is to provide a battery pack, comprising a box body and the above-mentioned battery module, wherein the box body is provided with a receiving cavity, and the battery module is arranged in the receiving cavity.

[0027] Beneficial effects of the utility model:

[0028] In the battery module provided by the present invention, the clamping portion of the heat spreader is clamped between the sides of two adjacent battery cells. Since the heat spreader has a high thermal conductivity, the clamping portion can play a role in rapid heat transfer and temperature uniformity between the battery cells. The heat conducting portion is connected to one end of the clamping portion close to the cooling plate. The cross-sectional area of ​​the heat conducting portion in the direction parallel to the cooling plate is larger than the cross-sectional area of ​​the clamping portion in the direction parallel to the cooling plate, so that the heat spreader can be positioned and fixed by two adjacent battery cells, and the heat conducting portion can also effectively expand the contact area between the heat spreader and the outside, thereby increasing the heat exchange area, so as to better improve the heat transfer effect and the uniformity of heat transfer. The heat transfer path of the battery cell in this embodiment is: battery cell-clamping portion-heat conducting portion-cooling plate. This structure can not only dissipate heat for the battery cell (coolant is passed into the cooling plate), but also heat the battery cell (heating fluid is passed into the cooling plate). It has good heat transfer performance and heat dissipation effect. At the same time, it has good heat transfer uniformity, effectively ensuring the temperature consistency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of a battery module provided by an embodiment of the present utility model;

[0031] Figure 2 This is an exploded view of a battery module provided by an embodiment of the present utility model;

[0032] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0033] Figure 4 is a cross-sectional view of a battery module provided by an embodiment of the present utility model;

[0034] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle.

[0035] In the picture:

[0036] 1. Battery cells;

[0037] 2. Cooling plate; 21. Water inlet pipe; 22. Water outlet pipe; 23. Connecting part;

[0038] 3. Heat conducting assembly; 31. Heat sink; 311. Clamping portion; 312. Heat conducting portion; 32. Heat transfer element; 33. First heat conducting structure; 34. Second heat conducting structure;

[0039] 4. Connectors. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0044] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0045] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0048] This embodiment provides a battery module with a simple structure, good heat transfer performance and heat dissipation effect, and good heat transfer uniformity, which effectively ensures the temperature consistency of the battery core, thereby improving the cycle life and safety of the battery core. Figure 1 and Figure 2 As shown, the battery module includes a battery cell 1, a cooling plate 2, a heat conducting component 3 and a connector 4.

[0049] There are multiple battery cells 1 , which are sequentially arranged on one side of the cooling plate 2 along a preset direction and are sequentially connected end to end in series through the connector 4 .

[0050] Specifically, in this embodiment, Figure 2 As shown, the battery module includes a plurality of battery cells 1 arranged in a rectangular array. Among them, 4 battery cells 1 are arranged side by side along a first direction, and 11 battery cells 1 are arranged side by side along a second direction. The first direction is parallel to the width direction of the rectangle, and the second direction is parallel to the length direction of the rectangle. In the 4 battery cells 1 in the same column, the positive pole and the negative pole of two adjacent battery cells 1 are opposite to each other and are connected in series through a connector 4; in the 11 battery cells 1 in the same row, the polarity of the same side of two adjacent battery cells 1 is different, and the positive pole and the negative pole of two adjacent battery cells 1 at the end along the first direction are connected in series, thereby forming a battery module with 4*11 battery cells 1 in series. Of course, in other embodiments, the specific number of battery cells 1 can be determined according to actual needs and is not limited here.

[0051] Continue to refer to Figure 2 and Figure 3 The heat conducting assembly 3 includes a vapor chamber 31, a heat transfer element 32, and a heat conducting structure. The vapor chamber 31 is sandwiched between two adjacent battery cells 1, and the heat transfer element 32 and the heat conducting structure are arranged between the vapor chamber 31 and the cooling plate 2. The vapor chamber 31 can quickly transfer heat from the battery cells 1 to the heat transfer element 32 and the heat conducting structure, and then to the cooling plate 2, thereby achieving rapid heat exchange.

[0052] Specifically, if Figure 2-Figure 5 As shown, the heat spreader 31 includes a clamping portion 311 and a heat conducting portion 312. The clamping portion 311 is clamped between the sides of two adjacent battery cells 1. Since the heat spreader 31 has a high thermal conductivity, the clamping portion 311 can quickly transfer heat and equalize the temperature between the battery cells 1. The heat conducting portion 312 is connected to one end of the clamping portion 311 close to the cooling plate 2. The thickness of the heat conducting portion 312 is greater than the thickness of the clamping portion 311. The step surfaces on both sides of the connection between the heat conducting portion 312 and the clamping portion 311 are respectively in contact with the top corners of the two battery cells 1, and the heat spreader 31 can be positioned and fixed by the two adjacent battery cells 1. The heat conducting portion 312 can also effectively expand the contact area between the heat spreader 31 and the outside, thereby increasing the heat exchange area.

[0053] Optionally, the heat spreader 31 may preferably be a heat pipe structure. In this embodiment, the heat spreader 31 includes a shell, a wick, and a support column. A sealed heat transfer space is provided in the shell, and the heat transfer space includes a connected condensation end and an evaporation end. The wick is attached to the inner wall of the heat transfer space, with one part of the wick located at the condensation end and the other part located at the evaporation end. The support column is supported in the heat transfer space and is perpendicular to the wick. The principle of the heat spreader 31 is to utilize the PCM phase change to condense the evaporated liquid through the internal wick and promote backflow through capillary force. The entire heat spreader 31 system must satisfy the formula: Pca≥Pv+Pl+Pg, where Pca is the capillary force of the wick driving the working medium to reflux, Pv is the flow resistance of the vapor working medium in the steam chamber, Pl is the flow resistance of the liquid working medium from the condensation end to the evaporation end, and Pg is the liquid gravity pressure drop. It can be understood that the heat pipe structure is a relatively common structure in the field of heat conduction technology, and this embodiment will not further elaborate on its structural form.

[0054] Furthermore, the clamping portion 311 fits against the side surfaces of the largest areas of two adjacent battery cells 1 to quickly achieve heat transfer between the bottom and top of the battery cells 1, promote temperature uniformity of the battery cells 1, avoid excessive expansion of the large surface of the battery cells 1 due to heat, and ensure the safety of the battery cells 1 during use.

[0055] Preferably, the two side surfaces of the clamping portion 311 are bonded to the side surfaces of the battery core 1 by means of thermally conductive adhesive, thereby ensuring the heat transfer effect while increasing the reliability of the connection.

[0056] More specifically, refer to Figure 2 、 Figure 4 and Figure 5 The heat transfer element 32 is connected to the end surface of the heat conducting portion 312 facing away from the clamping portion 311, and the cross-sectional area of ​​the heat transfer element 32 is larger than the cross-sectional area of ​​the heat conducting portion 312. Compared with the heat conducting portion 312, the heat transfer element 32 is closer to the cooling plate 2 and has a larger area, further improving the heat exchange effect.

[0057] In this embodiment, the heat transfer element 32 may preferably be copper foil, which has good thermal conductivity and is light in weight, and does not affect the overall weight of the battery module.

[0058] More specifically, refer to Figure 2 and Figure 5 The heat conducting structure is provided on one side of the heat transfer member 32. The heat conducting structure not only fixes the heat transfer member 32, but also ensures more complete contact between the heat transfer member 32 and the heat conducting portion 312 and / or between the heat transfer member 32 and the cooling plate 2, thereby improving the heat transfer effect and uniformity.

[0059] Optionally, the heat-conducting structure includes a first heat-conducting structure 33. The first heat-conducting structure 33 is disposed between the heat-transfer element 32 and the cooling plate 2, with both sides of the first heat-conducting structure 33 closely contacting the heat-transfer element 32 and the cooling plate 2. The first heat-conducting structure 33 securely connects the heat-transfer element 32 to the cooling plate 2, increases the heat exchange area between the heat-transfer element 32 and the cooling plate 2, and thereby improves the heat transfer effect.

[0060] Preferably, the first heat-conducting structure 33 is a heat-conducting structural adhesive. This heat-conducting structural adhesive can be prepared using materials such as epoxy resin and nitrile rubber by coating and curing between the heat transfer element 32 and the cooling plate 2. Furthermore, due to its adhesive strength, the heat-conducting structural adhesive effectively bonds the heat transfer element 32 and the cooling plate 2 at its ends, thereby improving the reliability of the connection between the heat transfer element 32 and the cooling plate 2.

[0061] Optionally, the heat-conducting structure further includes a second heat-conducting structure 34. The second heat-conducting structure 34 is arranged on a side of the heat-transferring member 32 facing the battery core 1, and part of the heat-conducting portion 312 is penetrated by the second heat-conducting structure 34 and abuts against the heat-transferring member 32. The second heat-conducting structure 34 can fix the heat-conducting portion 312 and the heat-transferring member 32. At the same time, the heat of the heat-conducting portion 312 can be transferred to the heat-transferring member 32 through the contact between the end of the heat-conducting portion 312 and the heat-transferring member 32, and the heat of the heat-conducting portion 312 can also be transferred to the second heat-conducting structure 34 through the contact between the side of the heat-conducting portion 312 and the second heat-conducting structure 34, thereby realizing rapid heat transfer.

[0062] Preferably, the second heat-conducting structure 34 is a heat-conducting structural adhesive. Similarly, the heat-conducting structural adhesive can be prepared using materials such as epoxy resin and nitrile rubber, by coating and curing between the heat transfer element 32 and the heat-conducting portion 312. Furthermore, because the heat-conducting structural adhesive has adhesive strength, it can effectively bond the heat transfer element 32 and the heat-conducting portion 312 at its ends, thereby improving the reliability of the connection between the heat transfer element 32 and the heat-conducting portion 312.

[0063] Alternatively, as Figure 1 As shown, a plurality of flow channels are provided inside the cooling plate 2, and two adjacent flow channels are interconnected. By passing cooling fluid or heating fluid into the flow channels, the cooling plate 2 can be made to have the function of heat dissipation or heating.

[0064] Specifically, a water inlet pipe 21 and a water outlet pipe 22 are spaced apart on one side of the cooling plate 2. Both the water inlet pipe 21 and the water outlet pipe 22 are connected to the flow channel. The water inlet pipe 21 is used to inject cooling fluid or heating fluid into the flow channel. The fluid flows through the flow channels of the cooling plate 2 in sequence and flows out of the water outlet pipe 22 after heat exchange is completed.

[0065] More specifically, the water inlet pipe 21 and the water outlet pipe 22 are each provided with a connection portion 23, which extends toward the battery cell 1 and is configured to communicate with an external pipeline. The connection portion 23 can be configured as a tubular structure to communicate with an external cooling water pipe or hot water pipe.

[0066] The heat transfer path of the battery module in this embodiment is: battery cell 1-clamping part 311-heat conducting part 312-heat transfer element 32-heat conducting structure-cooling plate 2. This structure can both dissipate heat for the battery cell 1 (cooling liquid is passed into the cooling plate 2) and heat the battery cell 1 (heating fluid is passed into the cooling plate 2). The overall structural design is simple, and the heat transfer performance and heat dissipation effect are good. At the same time, the heat transfer uniformity is good, which effectively ensures the temperature consistency of the battery cell 1.

[0067] This embodiment also provides a battery pack, comprising a housing and the battery module provided in this embodiment. The housing comprises a bottom shell and a cover plate, which snaps onto the bottom shell to form a housing cavity, within which the battery module is disposed. The housing encases the battery module, ensuring its safety during use.

[0068] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery module, characterized in that: include: cooling plate (2); A plurality of battery cells (1), wherein the plurality of battery cells (1) are sequentially arranged on one side of the cooling plate (2) along a preset direction and connected via a connector (4); A heat conduction component (3) comprises a heat spreader (31), wherein the heat spreader (31) comprises a clamping portion (311) and a heat conduction portion (312), wherein the clamping portion (311) is clamped between the side surfaces of two adjacent battery cells (1), and the heat conduction portion (312) is connected to one end of the clamping portion (311) close to the cooling plate (2), wherein the cross-sectional area of ​​the heat conduction portion (312) in a direction parallel to the cooling plate (2) is greater than the cross-sectional area of ​​the clamping portion (311) in a direction parallel to the cooling plate (2), and the side of the heat conduction portion (312) facing away from the clamping portion (311) is heat-conductively connected to the cooling plate (2).

2. The battery module according to claim 1, wherein: The step surfaces on both sides of the connection between the heat conducting portion (312) and the clamping portion (311) respectively abut against the top corners of the two battery cells (1).

3. The battery module according to claim 1, wherein: The clamping portion (311) is fitted with the side surfaces of the largest areas of two adjacent battery cells (1).

4. The battery module according to any one of claims 1 to 3, characterized in that: The heat-conducting assembly (3) further comprises a heat-conducting member (32) and a heat-conducting structure, wherein the heat-conducting member (32) is connected to the end face of the heat-conducting portion (312) facing away from the clamping portion (311), the cross-sectional area of ​​the heat-conducting member (32) is larger than the cross-sectional area of ​​the heat-conducting portion (312), and the heat-conducting structure is arranged on a side face of the heat-conducting member (32).

5. The battery module according to claim 4, characterized in that: The heat-conducting structure comprises a first heat-conducting structure (33), the first heat-conducting structure (33) being arranged between the heat-conducting element (32) and the cooling plate (2), and both sides of the first heat-conducting structure (33) being in close contact with the heat-conducting element (32) and the cooling plate (2); and / or, The heat-conducting structure further includes a second heat-conducting structure (34), which is arranged on a side of the heat-conducting member (32) facing the battery core (1), and a portion of the heat-conducting portion (312) is penetrated by the second heat-conducting structure (34) and abuts against the heat-conducting member (32).

6. The battery module according to claim 5, characterized in that: The first heat-conducting structure (33) is a heat-conducting structural adhesive; and / or, The second heat-conducting structure (34) is a heat-conducting structural adhesive.

7. The battery module according to any one of claims 1 to 3, characterized in that: The plurality of battery cells (1) are arranged in parallel along a first direction, with the positive poles and negative poles of two adjacent battery cells (1) facing each other; and / or, The plurality of battery cells (1) are arranged side by side along a second direction, the polarities of two adjacent battery cells (1) on the same side are different, and the second direction is perpendicular to the first direction.

8. The battery module according to any one of claims 1 to 3, characterized in that: A plurality of flow channels are provided inside the cooling plate (2), and two adjacent flow channels are communicated with each other.

9. The battery module according to claim 8, characterized in that: A water inlet pipe (21) and a water outlet pipe (22) are arranged at intervals on one side of the cooling plate (2), and both the water inlet pipe (21) and the water outlet pipe (22) are in communication with the flow channel.

10. The battery module according to claim 9, characterized in that: The water inlet pipe (21) and the water outlet pipe (22) are both provided with a connecting portion (23), the connecting portion (23) extending toward the battery core (1), and the connecting portion (23) being configured to communicate with an external pipeline.

11. The battery module according to any one of claims 1 to 3, characterized in that: The heat spreader (31) is a heat pipe structure.

12. The battery module according to any one of claims 1 to 3, characterized in that: The heat conduction part (312) includes a shell, a liquid wick and a support column. A sealed heat transfer space is provided in the shell. The heat transfer space includes a condensation end and an evaporation end that are connected. The liquid wick is attached to the inner wall of the heat transfer space. A part of the liquid wick is located at the condensation end, and the other part is located at the evaporation end. The support column is supported in the heat transfer space and is perpendicular to the liquid wick.

13. A battery pack, characterized in that: It comprises a box body and a battery module according to any one of claims 1 to 12, wherein the box body is provided with a receiving cavity, and the battery module is arranged in the receiving cavity.

Images