Battery packs and electrical devices

Abstract

This application relates to a battery pack and an electrical device. The battery pack includes a battery module and a liquid cooling assembly. The battery module includes multiple individually arranged cells, each cell having a first surface and a second surface arranged opposite each other along the Z-direction. The positive and negative terminals of each cell are located on the same side and are both located on the first surface. The liquid cooling assembly includes a liquid cooling plate that contacts the second surfaces of the cells. The coolant in the liquid cooling plate carries away heat transferred to the second surfaces of the cells. The battery module also includes a graphene heat dissipation film, which is applied to multiple surfaces of the cells other than the first surface, allowing heat generated on the first surface of the cells to be transferred to the second surfaces via the graphene heat dissipation film. The graphene heat dissipation film in this battery pack, with its high thermal conductivity, improves the heat transfer efficiency of the individual cells, thereby significantly reducing the problem of uneven temperature distribution on the outer surfaces of the individual cells.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] Currently, the common thermal management solutions for power batteries are to place a liquid cooling plate at the bottom of the cell for cooling, place heat insulation pads between different cells for heat insulation protection, and commonly use a PET blue film to wrap the cell shell.

[0003] Because the bottom of the battery cell is in direct contact with the liquid cooling plate for heat exchange, the heat exchange effect is good. However, a large amount of Joule heat generated by the top electrode of the battery cell is conducted to the bottom along the height direction of the battery cell, resulting in poor heat exchange effect. This will also lead to uneven heat exchange on the surface of the battery cell, resulting in uneven temperature distribution on the surface of the battery cell.

[0004] Therefore, under the existing bottom liquid cooling design of battery cells, how to enhance heat transfer in the height direction of the battery cell and improve the temperature uniformity of the battery cell surface is an important issue facing thermal management design. Utility Model Content

[0005] In view of this, the present application provides a battery pack and power device to solve at least one problem existing in the background art, which can improve the surface temperature uniformity of individual cells.

[0006] In a first aspect, embodiments of this application provide a battery pack, the battery pack comprising:

[0007] A battery module includes multiple individual batteries arranged in an array. Each individual battery has a first surface and a second surface arranged opposite to each other along the Z direction. The positive and negative terminals of each individual battery are located on the same side and are both disposed on the first surface. The Z direction is the height direction of the individual battery.

[0008] A liquid cooling assembly includes a liquid cooling plate that is in contact with the second surfaces of a plurality of individual cells, wherein the coolant in the liquid cooling plate carries away the heat transferred to the second surfaces of the individual cells.

[0009] The battery module further includes a graphene heat dissipation film, which is applied to multiple surfaces of the single battery cell other than the first surface, so that the heat generated on the first surface of the single battery cell is transferred to the second surface through the graphene heat dissipation film.

[0010] In conjunction with the first aspect of this application, in an optional embodiment, the single battery cell further has a first side and a second side disposed opposite to each other along the Y direction, and a third side and a fourth side disposed opposite to each other along the X direction, wherein the area of ​​the first side or the second side is greater than the area of ​​the third side or the fourth side, the Y direction is the thickness direction of the single battery cell, and the X direction is the length direction of the single battery cell.

[0011] The graphene heat dissipation film is applied to at least the first side, the second side, and the second surface of the single battery cell.

[0012] In conjunction with the first aspect of this application, in an optional embodiment, the graphene heat dissipation film is further applied to the third side of the single battery cell, wherein the first side, the third side, and the second side are sequentially connected.

[0013] The third side is located on the side corresponding to the location of the positive electrode post.

[0014] In conjunction with the first aspect of this application, in an optional embodiment, the graphene heat dissipation film is further applied to the fourth side of the single battery cell, wherein the first side, the third side, the second side, and the fourth side are sequentially connected.

[0015] The fourth side is located on the side corresponding to the location of the negative electrode post.

[0016] In conjunction with the first aspect of this application, in an optional embodiment, the graphene heat dissipation film adopts a multilayer structure, including a graphene layer, an insulating layer and an adhesive layer, wherein the insulating layers are respectively disposed on opposite sides of the graphene layer, the adhesive layer is disposed on the outer surface of any of the insulating layers, and the graphene heat dissipation film is bonded to the single battery cell through the adhesive layer;

[0017] The adhesive layer is made of substrate-free acrylic adhesive.

[0018] In conjunction with the first aspect of this application, in an optional embodiment, the battery module further includes:

[0019] A thermal insulation component is attached to the third side and / or the fourth side.

[0020] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack further includes:

[0021] A heat insulation component is connected to the first side and / or the second side of the single battery cell. The heat insulation component includes a plurality of heat insulation pads, which are spaced apart along the X direction or the Z direction.

[0022] In conjunction with the first aspect of this application, in an alternative embodiment, the graphene heat dissipation film at least covers the edge of the heat insulation pad corresponding to the negative electrode post.

[0023] In conjunction with the first aspect of this application, in an optional embodiment, the liquid cooling plate includes a liquid cooling upper plate and a liquid cooling lower plate, and a liquid cooling flow channel is formed between the liquid cooling upper plate and the liquid cooling lower plate, wherein the coolant flows in the liquid cooling flow channel to remove the heat transferred from the first surface to the second surface;

[0024] The individual battery cells are connected to the liquid cooling plate by thermally conductive structural adhesive.

[0025] Secondly, embodiments of this application provide an electrical device including a battery pack according to any embodiment provided in the first aspect.

[0026] The battery pack and power device provided in this application embodiment utilize a graphene heat dissipation film applied to the surface of a single battery cell. The graphene heat dissipation film, which has a high thermal conductivity, can improve the heat transfer efficiency of the single battery cell, thereby greatly reducing the problem of uneven temperature on the outer surface of the single battery cell. At the same time, the graphene heat dissipation film has high adhesive adhesion performance, which greatly reduces the possibility of damage or delamination of the graphene heat dissipation film caused by external impact.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a partial structural schematic diagram of the battery pack provided in an embodiment of this application;

[0030] Figure 2 A partial exploded view of the battery pack provided in an embodiment of this application;

[0031] Figure 3 This is a three-dimensional schematic diagram of a single battery cell in a battery pack provided in an embodiment of this application;

[0032] Figure 4 This is an exploded view of the structure of a single cell and a graphene heat dissipation film in a battery pack provided in an embodiment of this application.

[0033] Figure 5 This is an exploded view of the structure of a single cell and a graphene heat dissipation film in a battery pack provided in another embodiment of this application.

[0034] Figure 6 This is an exploded view of the structure of a single cell and a graphene heat dissipation film in a battery pack provided in another embodiment of this application.

[0035] Figure 7 This is a three-dimensional structural diagram of a single battery cell in a battery pack provided in another embodiment of this application;

[0036] Figure 8 This is a cross-sectional view of the graphene heat dissipation film in the battery pack provided in an embodiment of this application.

[0037] Figure label:

[0038] 100. Battery pack;

[0039] 10. Battery module; 11. Single cell; 1111. Positive electrode post; 1112. Negative electrode post; 112. First surface; 113. Second surface; 114. First side surface; 115. Second side surface; 116. Third side surface; 117. Fourth side surface; 12. Graphene heat dissipation film; 121. Graphene layer; 122. Insulating layer; 123. Adhesive layer; 13. Thermal insulation component;

[0040] 20. Liquid cooling assembly; 21. Liquid cooling plate; 211. Upper liquid cooling plate; 212. Lower liquid cooling plate; 213. Liquid cooling channel; 214. Liquid inlet; 215. Liquid outlet;

[0041] 40. Thermal insulation components; 41. Thermal insulation pads. Detailed Implementation

[0042] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0043] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this utility model.

[0044] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly indicate that at least one of those features is included. In the description of this utility model, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0045] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0047] In related technologies, the surface of the individual battery cell 11 is generally covered with a blue film substrate PET. PET is a low surface energy material, resulting in low adhesion strength of the structural adhesive on its surface. Furthermore, the PSA adhesive of the blue film also has poor adhesion properties. Under these circumstances, when the battery pack 100 is subjected to external impact, the structural adhesive may experience interfacial damage and detach from the blue film, or the PSA adhesive of the blue film may undergo cohesive failure, directly causing the blue film to detach and peel off from the surface of the individual battery cell 11.

[0048] Based on the above-mentioned technical problems, this application provides a battery pack 100, which uses a graphene heat dissipation film 12 attached to the surface of a single battery cell 11. The graphene heat dissipation film 12, which has a high thermal conductivity, can improve the heat transfer efficiency of the single battery cell 11, thereby greatly reducing the problem of uneven temperature on the outer surface of the single battery cell 11. At the same time, the graphene heat dissipation film 12 has high adhesive adhesion performance, which greatly reduces the possibility of damage or delamination of the graphene heat dissipation film 12 due to external impact.

[0049] For details, please refer to Figures 1 to 3 The battery pack provided in this application embodiment includes a battery module 10 and a liquid cooling component 20.

[0050] The battery module 10 includes multiple individual battery cells 11 arranged in an array. Each individual battery cell 11 has a direction along the Z-axis (i.e., Figure 1 The first surface 112 and the second surface 113 of the coordinate system shown in the figure are arranged opposite each other. The positive terminal 1111 and the negative terminal 1112 of the single cell 11 are located on the same side and are both disposed on the first surface 112. In this embodiment, the Z direction is the height direction of the single cell 11.

[0051] The liquid cooling assembly 20 includes a liquid cooling plate 21, which is in contact with the second surface 113 of a plurality of individual cells 11. The coolant in the liquid cooling plate 21 carries away the heat transferred to the second surface 113 of the individual cells 11, so that the liquid cooling plate 21 and the second surface 113 of the individual cells 11 can exchange heat.

[0052] The battery module 10 also includes a graphene heat dissipation film 12, which is applied to multiple surfaces of the single cell 11 other than the first surface 112, so that the heat generated by the first surface 112 of the single cell 11 is transferred to the second surface 113 through the graphene heat dissipation film 12.

[0053] A significant amount of Joule heat is generated at the positive electrode post 1111 and the negative electrode post 1112 of the single cell 11. After the Joule heat is transferred to the surface of the single cell 11 casing, the graphene heat dissipation film 12, with its high thermal conductivity, can quickly conduct the heat on the first surface 112 of the single cell 11 to the direction with a lower temperature, greatly reducing the temperature difference on the surface of the single cell 11 and ensuring the temperature uniformity of the surface of the single cell 11.

[0054] The graphene heat dissipation film 12 has a thickness of 22-28 μm, preferably 25 μm, and its surface is covered with a dense insulating protective layer. A 3 μm substrate-free acrylic adhesive is applied to the portion in contact with the aluminum shell of the individual battery 11. The insulating protective layer and the substrate-free acrylic adhesive have minimal impact on the thermal conductivity of the graphene heat dissipation film 12. The performance parameters of the graphene heat dissipation film 12 are shown in the table below.

[0055]

[0056] Performance parameters of graphene heat dissipation film

[0057] In one alternative embodiment, please refer to Figure 1 , Figure 2 and Figure 4 The single cell 11 also has a feature along the Y direction (i.e., Figure 1 The first side surface 114 and the second side surface 115 are arranged relative to each other in the coordinate system shown in the figure (Y-axis direction), and along the X-direction (i.e., Figure 1 The third side 116 and the fourth side 117 are arranged opposite each other in the coordinate system shown in the figure (X-axis direction), and the area of ​​the first side 114 or the second side 115 is larger than the area of ​​the third side 116 or the fourth side 117. In this embodiment, the Y direction is the thickness direction of the single cell 11, and the X direction is the length direction of the single cell 11.

[0058] The graphene heat dissipation film 12 is applied to at least the first side 114, the second side 115, and the second surface 113 of the single cell 11. The graphene heat dissipation film 12 applied to the first side 114, the second side 115, and the second surface 113 of the single cell 11 can efficiently transfer the relatively concentrated heat located on the first surface 112 of the single cell 11 to the low temperature area, thereby improving the uniformity of the surface temperature of the single cell 11 and further improving the safety of the battery pack 100.

[0059] In one alternative embodiment, please refer to Figure 1 , Figure 2 and Figure 5 The graphene heat dissipation film 12 is also attached to the third side 116 of the single cell 11. The first side 114, the third side 116 and the second side 115 are connected in sequence. The third side 116 is located on the side corresponding to the position of the positive electrode post 1111.

[0060] The positive electrode post 1111 of the single cell 11 is made of aluminum, and the negative electrode post 1112 of the single cell 11 is made of copper. The Joule heat of the positive electrode post 1111 is higher than that of the negative electrode post 1112. Therefore, the fourth side 117 corresponding to the negative electrode post 1112 does not need to be covered with a graphene heat dissipation film 12. It is only necessary to cover the third side 116 corresponding to the positive electrode post 1111 with a graphene heat dissipation film 12 to improve the heat conduction efficiency and thus improve the surface thermal uniformity of the single cell 11.

[0061] In one alternative embodiment, please refer to Figure 1 , Figure 2 and Figure 6The graphene heat dissipation film 12 is also attached to the fourth side 117 of the single cell 11, and the first side 114, the third side 116, the second side 115 and the fourth side 117 are connected in sequence. The fourth side 117 is located on the side corresponding to the position of the negative electrode post 1112.

[0062] The graphene heat dissipation film 12 is applied to the four sides and bottom of the single cell 11. The graphene heat dissipation film 12, which has high thermal conductivity, can conduct heat to the low temperature from more directions, which can further improve the uniformity of the surface temperature of the single cell 11 and further improve the safety of the battery pack 100.

[0063] In one alternative embodiment, please refer to Figure 8 The graphene heat dissipation film 12 adopts a multi-layer structure, including graphene 121, insulating layer 122 and adhesive layer 123. Two insulating layers 122 are respectively disposed on opposite sides of the graphene layer 121, and the adhesive layer 123 is disposed on the outer surface of any insulating layer 122. The graphene heat dissipation film 12 is bonded to the single cell 11 through the adhesive layer 123.

[0064] The graphene heat dissipation film 12 containing the insulating layer 122 serves as the insulating protective layer for the battery cell. The surface of the battery cell no longer needs to be covered with a blue film, which can avoid the problem of insulation breakdown caused by easy damage and delamination of the blue film. At the same time, since the blue film also has a certain thermal resistance, removing the blue film can enhance the thermal conduction between the surface of the single cell 11 and the graphene heat dissipation film 12.

[0065] In an optional embodiment, the adhesive layer is made of substrate-free acrylic adhesive. Substrate-free acrylic adhesive has minimal impact on the thermal conductivity of the graphene heat dissipation film 12, ensuring its heat transfer efficiency. It should be noted that substrate-free acrylic adhesive is a pressure-sensitive adhesive that does not rely on any intermediate carrier such as film, paper, or foam, and is a known commercially available pressure-sensitive adhesive. By selecting substrate-free acrylic adhesive, this application can ensure overall heat transfer efficiency and improve overall performance.

[0066] In one alternative embodiment, please refer to Figure 2 The battery module 10 also includes a heat insulation component 13, which is connected to the third side 116 and / or the fourth side 117.

[0067] The material of the heat insulation component 13 can be epoxy board, silicone foam, or other insulating materials. This application does not specifically limit the material.

[0068] Structural adhesive is adhered to one or both sides of the thermal insulation component 13 to serve as an adhesive for connecting it to the casing of the individual cell 11, thereby achieving thermal insulation between adjacent individual cells 11 on the third side 116 and / or the fourth side 117, that is, achieving thermal insulation between the small sides of different rows of individual cells 11.

[0069] In one alternative embodiment, please refer to Figure 2 , Figure 3 and Figure 7 The battery pack 100 also includes a heat insulation element 40, which is connected to the first side 114 and / or the second side 115 of the individual battery cell 11. The heat insulation element 40 includes a plurality of heat insulation pads 41, which are arranged along the X direction (i.e., Figure 1 The coordinate system shown in the figure has the X-axis direction or the Z-axis direction (that is, the coordinate system shown in the figure). Figure 1 The spacing of multiple heat insulation pads 41 (in the Z direction of the coordinate system shown) can reduce the amount of heat insulation pads 41 used and reduce the manufacturing cost of the battery pack 100.

[0070] Figure 3 The image shows three heat insulation pads 41 spaced apart along the X direction. Figure 7 The diagram shows three heat insulation pads 41 spaced apart along the Z direction. Of course, the number of heat insulation pads 41 is not limited in this embodiment and can be set according to the size of the individual battery cell 11.

[0071] In an optional embodiment, the graphene heat dissipation film 12 at least covers the edge of the heat insulation pad 41 corresponding to the negative electrode post 1112, which ensures thermal insulation performance and prevents the graphene heat dissipation film 12 from being damaged or delaminated due to stress at the edge.

[0072] In one alternative embodiment, please refer to Figure 2 The liquid cooling plate 21 includes a liquid cooling upper plate 211 and a liquid cooling lower plate 212. The liquid cooling upper plate 211 and the liquid cooling lower plate 212 form a liquid cooling channel 213. The coolant flows in the liquid cooling channel 213 to remove the heat transferred from the first surface 112 to the second surface 113. The single cell 11 is connected to the liquid cooling plate 21 by thermally conductive structural adhesive.

[0073] The liquid-cooled upper plate 211 is connected to an inlet 214 and an outlet 215. The inlet 214 and outlet 215 are located at opposite ends of the single cell 11 in the X direction, and both the inlet 214 and outlet 215 are connected to the liquid-cooled flow channel 213. The coolant with a lower temperature enters the liquid-cooled flow channel 213 through the inlet 214, exchanges heat in the liquid-cooled flow channel 213, and then exits through the outlet 215 to remove the heat.

[0074] The second surface 113 (i.e., the bottom surface of the single cell 11) and at least the first side 114 and the second side 115 of the single cell 11 are covered with a graphene heat dissipation film 12. This allows the heat from the first surface 112 of the single cell 11 to be conducted to the second surface 113 more quickly. Since the thermal conductivity of the graphene heat dissipation film 12 (1000-2000 W / m·K) is much greater than that of the casing of the single cell 11 (the casing is generally made of aluminum, which has a thermal conductivity of 238 W / m·K), the heat on the second surface 113 of the single cell 11 can be quickly exchanged with the liquid cooling plate 21. At the same time, it can improve the temperature uniformity of the side and bottom surfaces of the single cell 11 and avoid the situation where the temperature of the coolant on the outlet side after heat exchange with the single cell 11 is higher than that of the coolant on the inlet side, which would lead to uneven temperature distribution on both sides of the second surface 113 of the single cell 11.

[0075] This application embodiment also provides an electrical device, including the battery pack 100 provided in any of the above embodiments. Multiple battery packs 100 can directly supply power to the electrical device, or they can be connected in parallel, series, or mixed connections to form a power supply device, such as a battery module, to supply power to various electrical devices. The electrical device can take many forms, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, power tools, or various household appliances. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0076] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A battery pack, characterized in that, The battery pack (100) includes: The battery module (10) includes a plurality of individual battery cells (11) arranged in a row. Each individual battery cell (11) has a first surface (112) and a second surface (113) arranged opposite to each other along the Z direction. The positive terminal (1111) and the negative terminal (1112) of the individual battery cell (11) are located on the same side and are both disposed on the first surface (112). The Z direction is the height direction of the individual battery cell (11). The liquid cooling assembly (20) includes a liquid cooling plate (21) that is in contact with the second surface (113) of the plurality of individual cells (11), and the coolant in the liquid cooling plate (21) carries away the heat transferred to the second surface (113) of the individual cells (11); The battery module (10) further includes a graphene heat dissipation film (12), which is applied to multiple surfaces of the single cell (11) other than the first surface (112) so that the heat generated on the first surface (112) of the single cell (11) is transferred to the second surface (113) through the graphene heat dissipation film (12).

2. The battery pack according to claim 1, characterized in that, The single cell (11) also has a first side (114) and a second side (115) arranged opposite to each other along the Y direction, and a third side (116) and a fourth side (117) arranged opposite to each other along the X direction. The area of ​​the first side (114) or the second side (115) is greater than the area of ​​the third side (116) or the fourth side (117). The Y direction is the thickness direction of the single cell (11), and the X direction is the length direction of the single cell (11). The graphene heat dissipation film (12) is applied to at least the first side (114), the second side (115), and the second surface (113) of the single cell (11).

3. The battery pack according to claim 2, characterized in that, The graphene heat dissipation film (12) is also attached to the third side (116) of the single cell (11), and the first side (114), the third side (116) and the second side (115) are connected in sequence. The third side (116) is located on the side corresponding to the location of the positive electrode post (1111).

4. The battery pack according to claim 3, characterized in that, The graphene heat dissipation film (12) is also attached to the fourth side (117) of the single cell (11), and the first side (114), the third side (116), the second side (115) and the fourth side (117) are connected in sequence. The fourth side (117) is located on the side corresponding to the position of the negative electrode post (1112).

5. The battery pack according to any one of claims 2 to 4, characterized in that, The graphene heat dissipation film (12) has a multilayer structure, including a graphene layer (121), an insulating layer (122) and an adhesive layer (123). The insulating layers (122) are respectively disposed on opposite sides of the graphene layer (121), and the adhesive layer (123) is disposed on the outer surface of any of the insulating layers (122). The graphene heat dissipation film is bonded to the single cell (11) through the adhesive layer (123). The adhesive layer is made of substrate-free acrylic adhesive.

6. The battery pack according to any one of claims 2-4, characterized in that, The battery module (10) also includes: A thermal insulation component (13) is connected to the third side (116) and / or the fourth side (117).

7. The battery pack according to any one of claims 2-4, characterized in that, The battery pack (100) also includes: A heat insulation element (40) is connected to the first side (114) and / or the second side (115) of the single cell (11). The heat insulation element (40) includes a plurality of heat insulation pads (41) which are spaced apart along the X direction or the Z direction.

8. The battery pack according to claim 7, characterized in that, The graphene heat dissipation film (12) at least covers the edge of the heat insulation pad (41) corresponding to the negative electrode post (1112).

9. The battery pack according to claim 1, characterized in that, The liquid cooling plate (21) includes a liquid cooling upper plate (211) and a liquid cooling lower plate (212), and a liquid cooling channel (213) is formed between the liquid cooling upper plate (211) and the liquid cooling lower plate (212). The coolant flows in the liquid cooling channel (213) to remove the heat transferred from the first surface (112) to the second surface (113). The individual battery cell (11) is connected to the liquid cooling plate (21) by thermally conductive structural adhesive (30).

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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