Box assembly and battery pack with same

Abstract

The utility model discloses a box body assembly and a battery pack with the box body assembly, the box body assembly comprises: a box body, the box body is provided with a mounting cavity; the heat preservation structure is arranged in the installation cavity and arranged on the inner wall of at least one side of the installation cavity, the heat preservation structure comprises a framework and heat preservation parts, the framework is in a grid shape, the gaps of the framework are filled with the heat preservation parts, and / or the framework is wrapped by the heat preservation parts. According to the box body assembly disclosed by the utility model, by arranging the heat preservation structure with the framework and the heat preservation piece, on one hand, the heat preservation performance of the battery pack can be improved, so that the working effect of the battery pack in a low-temperature environment is improved, and on the other hand, the structural strength of the heat preservation structure can meet the use requirement of the battery pack.

Description

Technical Field

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

[0002] Temperature changes have a significant impact on the working performance of the battery. In a low temperature environment, the battery's charging efficiency and battery life will be greatly affected. In related technologies, the battery's thermal insulation ability is poor, which makes the battery work poorly in a low temperature environment. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a box assembly, which can improve the working effect of the battery pack in a low temperature environment.

[0004] The utility model also provides a battery pack having the box assembly.

[0005] According to the first aspect of the utility model, the box assembly is used for a battery pack, and the box assembly includes: a box, the box having an installation cavity; a thermal insulation structure, the thermal insulation structure is arranged in the installation cavity and on at least one side inner wall of the installation cavity, the thermal insulation structure includes: a frame and a thermal insulation component, the frame is in a grid shape, the thermal insulation component is filled in the gap of the frame, and / or the thermal insulation component covers the frame.

[0006] According to the box assembly of the first aspect of the utility model, by providing a thermal insulation structure with a skeleton and thermal insulation parts, on the one hand, the thermal insulation performance of the battery pack can be improved, thereby improving the working effect of the battery pack in a low temperature environment, and on the other hand, the structural strength of the thermal insulation structure can meet the use requirements of the battery pack.

[0007] According to some embodiments of the utility model, the skeleton includes: a plurality of first support members, the plurality of first support members are arranged at intervals in a first direction, the first support members extend along a second direction, and the first direction intersects with the second direction; a plurality of second support members, the second support members are arranged at intervals in the second direction, the second support members extend along the first direction, the plurality of first support members and the plurality of second support members are connected to form the grid-like skeleton.

[0008] According to some embodiments of the utility model, the first support member has a plurality of first grooves arranged at intervals along the second direction formed on both sides of the third direction, the third direction, the first direction and the second direction intersect each other, and the first grooves penetrate the first support member along the first direction; and / or the second support member has a plurality of second grooves arranged at intervals along the first direction formed on both sides of the third direction, and the second grooves penetrate the second support member along the second direction.

[0009] According to some embodiments of the utility model, a first card slot is formed on the bottom wall of at least part of the first groove, and the first card slot passes through the first support member along the first direction; a second card slot is formed on the bottom wall of at least part of the second groove, and the second card slot passes through the second support member along the second direction, wherein the bottom wall of the first card slot is held in the second card slot, and the bottom wall of the second card slot is held in the first card slot.

[0010] According to some embodiments of the present utility model, the thermal insulation component is a foam material component, and the foam material component is foamed and formed in the installation cavity.

[0011] According to some embodiments of the utility model, the box body includes: a protective beam, a supporting flange is formed on one side of the protective beam in the thickness direction, an exhaust channel extending along the length direction of the protective beam is defined in the protective beam, the protective beam is formed with an exhaust hole connecting the installation cavity and the exhaust channel, and the protective beam is formed with an exhaust hole that passes through the bottom wall of the exhaust channel from top to bottom; a bottom plate, the end of the bottom plate is supported on the supporting flange, and the installation cavity is located on the upper side of the bottom plate; a bottom guard plate, the bottom guard plate is connected to the lower side of the protective beam, the bottom guard plate, the bottom plate and the protective beam define an exhaust channel located on the lower side of the bottom plate, and the exhaust hole is connected between the exhaust channel and the exhaust channel.

[0012] According to some embodiments of the utility model, the protective beam is provided with a guide portion, one end of the guide portion is connected to the inner wall of the exhaust channel located above the exhaust hole, and a side surface of the guide portion facing the exhaust hole is formed as a guide slope extending downward and away from the exhaust hole, and in the thickness direction of the protective beam, at least a portion of the exhaust hole is opposite to the guide slope.

[0013] According to some embodiments of the utility model, a limit groove opening upward is formed on the upper surface of the protective beam, the side wall height of the limit groove close to the installation cavity is lower than the side wall height of the limit groove away from the installation cavity, and the limit groove is configured to be suitable for clamping the bus.

[0014] According to some embodiments of the present invention, a side of the top wall of the protection beam facing the installation cavity is recessed toward the exhaust channel to form the limiting groove on the outer surface of the protection beam and to form the guide portion in the exhaust channel.

[0015] The battery pack according to the second aspect of the utility model comprises: the above-mentioned box assembly according to the first aspect of the utility model, the box is formed with a glue injection hole that penetrates the box along the thickness direction, and the glue injection hole is connected to the position of the thermal insulation structure; a plurality of battery cells, and the battery cells are arranged in the installation cavity.

[0016] According to the battery pack of the second aspect of the utility model, by providing the box assembly according to the first aspect of the utility model, the thermal insulation performance of the battery pack can be improved, thereby improving the working effect of the battery pack in a low temperature environment.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of a battery pack according to an embodiment of the utility model;

[0019] Figure 2 is a cross-sectional view of a box assembly according to an embodiment of the utility model;

[0020] Figure 3 yes Figure 2 A schematic diagram of the protection beam shown in ;

[0021] Figure 4 yes Figure 2 Schematic diagram of the skeleton and base plate shown in;

[0022] Figure 5 yes Figure 4 Schematic diagram of the first support member and the second support member shown in .

[0023] Reference numerals:

[0024] 1000, battery pack;

[0025] 100. Box assembly;

[0026] 10. Box body; 11. Installation cavity; 12. Protection beam; 121. Support flange; 122. Exhaust channel; 123. Exhaust hole; 124. Exhaust hole; 125. Guide part; 126. Limiting groove; 13. Bottom plate; 14. Bottom guard plate; 141. Exhaust channel; 15. Upper cover;

[0027] 20. frame; 21. first support member; 211. first groove; 212. first slot; 22. second support member; 221. second groove; 222. second slot;

[0028] 200. Battery cell. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and 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 to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Reference below Figure 1-Figure 5 The box assembly 100 according to the first embodiment of the utility model is described.

[0031] like Figure 1 , Figure 2 and Figure 4 As shown, the box assembly 100 according to the embodiment of the first aspect of the utility model is used for a battery pack 1000, including: a box 10 and a heat preservation structure.

[0032] Specifically, the box body 10 has an installation cavity 11, the insulation structure is arranged in the installation cavity 11 and on at least one side inner wall of the installation cavity 11, the insulation structure includes: a frame 20 and an insulation component, the frame 20 is in a grid shape, the insulation component is filled in the gap of the frame 20, and / or the insulation component covers the frame 20.

[0033] That is to say, the thermal insulation component may be filled in the gaps of the skeleton 20 , the thermal insulation component may cover the skeleton 20 , or the thermal insulation component may be filled in the gaps of the skeleton 20 and the thermal insulation component may cover the skeleton 20 .

[0034] When the battery pack 1000 is assembled, the heat preservation structure is located between the battery cell 200 and the inner wall of the installation cavity 11 , and the heat preservation structure provides support between the battery cell 200 and the inner wall of the installation cavity 11 .

[0035] It is understandable to those skilled in the art that when the temperature of the battery pack 1000 is low, the working performance of the battery pack 1000 will be poor, for example, the battery life of the battery pack 1000 will be reduced, and the charging rate of the battery pack 1000 will be reduced.

[0036] In this embodiment, a thermal insulation structure is provided on the inner wall of one side of the installation cavity 11. The heat in the battery pack 1000 needs to be transferred to the thermal insulation structure first, and then transferred from the thermal insulation structure to the box body 10. The heat can only be lost from the installation cavity 11 through heat exchange between the box body 10 and the external environment.

[0037] Among them, it can be understood that the thermal conductivity efficiency of the thermal insulation parts in the thermal insulation structure is low, so the efficiency of heat loss in the battery pack 1000 is also low, thereby improving the thermal insulation performance of the battery pack 1000. By setting the skeleton 20 in a grid shape, the contact area between the skeleton 20 and the battery cell 200 and the inner wall of the installation cavity 11 is small, and the efficiency of heat conduction between the battery cell 200 and the box body 10 through the skeleton 20 is also low, thereby further improving the thermal insulation effect of the battery pack 1000. At the same time, the skeleton 20 can improve the structural strength of the thermal insulation structure, thereby making the battery cell 200 more stable in the installation cavity 11, and can reduce the probability of the battery cell 200 crushing the thermal insulation structure, thereby meeting the use needs of the battery pack 1000.

[0038] According to the box assembly 100 of the first aspect of the utility model, by providing a thermal insulation structure having a skeleton 20 and thermal insulation parts, on the one hand, the thermal insulation performance of the battery pack 1000 can be improved, thereby improving the working effect of the battery pack 1000 in a low temperature environment, and on the other hand, the structural strength of the thermal insulation structure can meet the use requirements of the battery pack 1000.

[0039] In some embodiments of the present invention, Figure 4 As shown, the skeleton 20 includes: a plurality of first support members 21 and a plurality of second support members 22 .

[0040] Among them, multiple first support members 21 are arranged at intervals in the first direction, the first support members 21 extend along the second direction, the first direction intersects with the second direction, the second support members 22 are arranged at intervals in the second direction, the second support members 22 extend along the first direction, and the multiple first support members 21 and the multiple second support members 22 are connected to form a grid-like skeleton 20.

[0041] Thus, the skeleton 20 can be arranged in a grid shape. During product design, parameters such as the number, size or relative angle of the first support members 21 and the second support members 22 can be adjusted to meet more product design needs and reduce product design difficulty.

[0042] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the first support member 21 has a plurality of first grooves 211 arranged at intervals along the second direction formed on both sides of the third direction, the third direction, the first direction and the second direction intersect each other, and the first grooves 211 penetrate the first support member 21 along the first direction; and / or, the second support member 22 has a plurality of second grooves 221 arranged at intervals in the first direction formed on both sides of the third direction, and the second grooves 221 penetrate the second support member 22 along the second direction.

[0043] That is, the first support member 21 may be provided with the first groove 211 , the second support member 22 may be provided with the second groove 221 , or the first support member 21 may be provided with the first groove 211 and the second support member 22 may be provided with the second groove 221 .

[0044] In this way, raised and recessed structures can be formed on both sides of the skeleton 20, so that the contact area between the skeleton 20 and the battery cell 200 and the inner wall of the installation cavity 11 can be reduced, thereby further reducing the efficiency of heat conduction between the battery cell 200 and the box body 10 through the skeleton 20, thereby improving the thermal insulation performance of the battery pack 1000.

[0045] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, a first card slot 212 is formed on the bottom wall of at least a portion of the first groove 211, and the first card slot 212 penetrates the first support member 21 along the first direction, and a second card slot 222 is formed on the bottom wall of at least a portion of the second groove 221, and the second card slot 222 penetrates the second support member 22 along the second direction, wherein the bottom wall of the first card slot 212 is clamped in the second card slot 222, and the bottom wall of the second card slot 222 is clamped in the first card slot 212.

[0046] In this way, the first support member 21 and the second support member 22 can be connected, and the first card slot 212 and the second card slot 222 can provide an avoidance space, so that the two side surfaces of the first support member 21 and the second support member 22 are flush, so that the insulation structure is more stable after contacting the battery cell 200. It can be understood that setting the first card slot 212 in the first groove 211 and setting the second card slot 222 in the second groove 221 can reduce the damage to the structure of the first support member 21 and the second support member 22, thereby improving the strength of the skeleton 20, and further improving the structural strength of the insulation structure, and can save the time of opening the first card slot 212 and the second card slot 222, thereby improving production efficiency.

[0047] In some embodiments of the utility model, the thermal insulation component is a foam material component, and the foam material component is foamed and formed in the installation cavity 11. During the assembly process, the battery cell 200 and the frame 20 are first assembled into the installation cavity 11, and then the thermal insulation component is foamed in the installation cavity 11. During the foaming process, the thermal insulation component gradually fills the gap between the frame 20 and the battery cell 200. In this way, the filling effect of the thermal insulation component can be ensured, and the difficulty in the production process can be reduced, and the production efficiency can be improved. Preferably, the thermal insulation component is a polyurethane foam, and the thermal insulation component can fill all the gaps in the installation cavity 11 after foaming, thereby covering the battery cell 200 and further improving the thermal insulation performance of the battery pack 1000.

[0048] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the box body 10 includes: a protection beam 12 , a bottom plate 13 and a bottom guard plate 14 .

[0049] Specifically, a supporting flange 121 is formed on one side of the protective beam 12 in the thickness direction, an exhaust channel 122 extending along the length direction of the protective beam 12 is defined in the protective beam 12, an exhaust hole 123 connecting the installation cavity 11 and the exhaust channel 122 is formed in the protective beam 12, and an exhaust hole 124 is formed on the bottom wall of the exhaust channel 122 which passes through the top and bottom of the protective beam 12. The end of the bottom plate 13 is supported on the supporting flange 121, the installation cavity 11 is located on the upper side of the bottom plate 13, the bottom guard plate 14 is connected to the lower side of the protective beam 12, the bottom guard plate 14, the bottom plate 13 and the protective beam 12 define an exhaust channel 141 located on the lower side of the bottom plate 13, and the exhaust hole 124 is connected between the exhaust channel 122 and the exhaust channel 141.

[0050] When thermal runaway occurs in the battery cell 200, the battery cell 200 generates high-temperature and high-pressure gas, and the high-temperature and high-pressure gas in the installation cavity 11 enters the exhaust channel 122 through the exhaust hole 123, and then passes through the exhaust channel 122 and enters the exhaust channel 141 from the exhaust hole 124, and then is discharged from the battery pack 1000 from the exhaust channel 141, thereby improving the safety of the battery pack 1000. In the exhaust process, the protective beam 12 and the bottom plate 13 can separate the exhaust channel 122 and the exhaust channel 141 from the installation cavity 11, thereby preventing the high-temperature and high-pressure gas in the exhaust channel 122 and the exhaust channel 141 from causing damage to the battery cell 200 and further spreading the thermal runaway.

[0051] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the protection beam 12 is provided with a guide portion 125, one end of which is connected to the inner wall of the exhaust passage 122 located above the exhaust hole 123, and a side surface of the guide portion 125 facing the exhaust hole 123 is formed as a guide slope extending downward and away from the exhaust hole 123, and at least a portion of the exhaust hole 123 is opposite to the guide slope in the thickness direction of the protection beam 12. When the high-temperature and high-pressure gas passes through the exhaust hole 123 and enters the exhaust passage 122, the guide slope can guide the high-temperature and high-pressure gas to flow downward toward the exhaust hole 124, thereby improving the exhaust efficiency.

[0052] In some embodiments of the present invention, Figure 2 and Figure 3As shown, the upper surface of the protective beam 12 is formed with a limit groove 126 opening upward, and the side wall height of the limit groove 126 close to the installation cavity 11 is lower than the side wall height of the limit groove 126 away from the installation cavity 11, and the limit groove 126 is configured to be suitable for clamping the bus. During the assembly process, the battery cell 200 is installed in the installation cavity 11 and the bus is placed in the limit groove 126. In this way, when the assembly is completed, the limit groove 126 can limit the movement of the battery cell 200 through the bus, thereby improving the structural stability of the battery pack 1000. Among them, the side wall height of the limit groove 126 close to the installation cavity 11 is lower than the side wall height of the limit groove 126 away from the installation cavity 11, which can provide an escape space for the battery cell 200. When the bus is placed in the limit groove 126, the upper surface of the battery cell 200 will not exceed the protective beam 12.

[0053] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the side of the top wall of the protection beam 12 facing the installation cavity 11 is recessed toward the exhaust passage 122 to form a limiting groove 126 on the outer surface of the protection beam 12, and a guide portion 125 is formed in the exhaust passage 122. In this way, the structure of the protection beam 12 is relatively simple, which can reduce the production difficulty during the production process, thereby further improving the production efficiency.

[0054] The battery pack 1000 according to the second embodiment of the utility model comprises: the box assembly 100 according to the first embodiment of the utility model and a plurality of battery cells 200. The box 10 is formed with a glue injection hole that penetrates the box 10 along the thickness direction, the glue injection hole is connected to the position where the heat preservation structure is located, and the battery cell 200 is arranged in the installation cavity 11.

[0055] During the production process, the battery cell 200 and the frame 20 are first assembled into the installation cavity 11, and then the insulation component of the foam material is injected into the installation cavity 11 through the injection hole. The insulation component foams in the installation cavity 11 and fills the gaps between the various components. When the foaming is completed, excess foaming material can overflow from the injection hole.

[0056] According to the battery pack 1000 of the second embodiment of the utility model, by providing the box assembly 100 of the first embodiment of the utility model, the thermal insulation performance of the battery pack 1000 can be improved, thereby improving the working effect of the battery pack 1000 in a low temperature environment.

[0057] In some embodiments of the present invention, Figure 1 and Figure 2As shown, the box assembly 100 also includes an upper cover 15, which is arranged on the upper side of the box body 10, and a glue injection hole is formed on the upper cover 15. In this way, during the production process, after the thermal insulation component is injected from the glue injection hole, the thermal insulation component can flow through more gaps in the installation cavity 11 under the action of gravity, thereby improving the filling effect of the thermal insulation component after foaming.

[0058] In some embodiments of the present invention, the box assembly 100 further includes: a sealing plate, which is sealed on the glue injection hole by structural glue, so that the glue injection hole can be sealed after the foaming is completed.

[0059] In some embodiments of the utility model, an overflow groove is formed around the glue injection hole. During the foaming process of the insulation component, the overflow groove can accommodate the foaming material overflowing from the glue injection hole to prevent the overflowed foaming material from flowing to other parts and affecting production, thereby reducing the difficulty of the production process.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A box assembly for a battery pack, characterized in that: include: A box body, wherein the box body has a mounting cavity; The thermal insulation structure is arranged in the installation cavity and on at least one inner wall of the installation cavity, and the thermal insulation structure includes: a frame and an insulation component, the frame is in a grid shape, the insulation component is filled in the gap of the frame, and / or the insulation component covers the frame.

2. The box assembly according to claim 1, characterized in that: The skeleton comprises: A plurality of first support members, wherein the plurality of first support members are arranged at intervals in a first direction, the first support members extend along a second direction, and the first direction intersects with the second direction; A plurality of second support members are arranged at intervals in the second direction, the second support members extend along the first direction, and a plurality of the first support members and a plurality of the second support members are connected to form the grid-like skeleton.

3. The box assembly according to claim 2, characterized in that: The first support member has a plurality of first grooves arranged at intervals along the second direction formed on both sides of the third direction, the third direction, the first direction and the second direction intersect each other, and the first grooves penetrate the first support member along the first direction; and / or, A plurality of second grooves arranged at intervals in the first direction are formed on both sides of the second support member in the third direction, and the second grooves penetrate the second support member along the second direction.

4. The box assembly according to claim 3, characterized in that: A first clamping groove is formed on at least part of the bottom wall of the first groove, and the first clamping groove penetrates the first supporting member along the first direction; A second clamping groove is formed on at least part of the bottom wall of the second groove, and the second clamping groove penetrates the second support member along the second direction. The bottom wall of the first card slot is clamped in the second card slot, and the bottom wall of the second card slot is clamped in the first card slot.

5. The box assembly according to claim 1, characterized in that: The heat-insulating component is a foam material component, and the foam material component is foamed and formed in the installation cavity.

6. The box assembly according to any one of claims 1 to 5, characterized in that: The box body comprises: A protection beam, wherein a support flange is formed on one side of the protection beam in a thickness direction, an exhaust passage extending along the length direction of the protection beam is defined in the protection beam, an exhaust hole connecting the mounting cavity and the exhaust passage is formed on the protection beam, and an exhaust hole penetrating the bottom wall of the exhaust passage from top to bottom is formed on the protection beam; A bottom plate, the end of which is supported on the supporting flange, and the mounting cavity is located on the upper side of the bottom plate; A bottom guard plate is connected to the lower side of the protective beam, the bottom guard plate, the bottom plate and the protective beam define an exhaust channel located at the lower side of the bottom plate, and the exhaust hole is connected between the exhaust channel and the exhaust channel.

7. The box assembly according to claim 6, characterized in that: The protective beam is provided with a guide portion, one end of the guide portion is connected to the inner wall of the exhaust channel located above the exhaust hole, and a side surface of the guide portion facing the exhaust hole is formed as a guide slope extending downward and away from the exhaust hole, and in the thickness direction of the protective beam, at least a portion of the exhaust hole is opposite to the guide slope.

8. The box assembly according to claim 7, characterized in that: A limiting groove opening upward is formed on the upper surface of the protection beam, the side wall height of the limiting groove close to the installation cavity is lower than the side wall height of the limiting groove away from the installation cavity, and the limiting groove is configured to be suitable for clamping the bus.

9. The box assembly according to claim 8, characterized in that: A side of the top wall of the protection beam facing the installation cavity is recessed toward the exhaust passage to form the limiting groove on the outer surface of the protection beam and to form the guide portion in the exhaust passage.

10. A battery pack, characterized in that: include: The box assembly according to any one of claims 1 to 9, wherein the box is formed with a glue injection hole that penetrates the box along the thickness direction, and the glue injection hole is connected to the location of the thermal insulation structure; A plurality of battery cells are disposed in the mounting cavity.

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