Single battery, battery and electric equipment

Abstract

The utility model relates to a single battery, a battery and electric equipment, and relates to the technical field of batteries, the single battery comprises a shell, a double-layer film body and a single-layer film body, the shell comprises at least one first side wall, at least one second side wall and a bottom wall, the first side wall and the second side wall are both connected with the bottom wall, the first side wall and the second side wall are adjacently arranged, and the single-layer film body is arranged between the first side wall and the second side wall. The components are mutually connected; the double-layer film body covers at least part of the first side wall, at least part of the second side wall and the bottom wall; one part of the first side wall is not coated with the double-layer film body so as to form a first hollow-out area, a single-layer film body is attached to the first hollow-out area, and the single-layer film body attached to the first hollow-out area is used for bonding a side plate of the box body or an adjacent single battery. According to the single battery, the battery and the electric equipment, the problem that the insulating film on the outer surface of the single battery is easy to fall off and lose efficacy after being bonded can be solved, and the performance of the single battery is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a single battery, a battery and an electric device. BACKGROUND

[0002] The outer surface of the shell of the single battery is usually attached with an insulating film, which can protect and insulate the single battery. In the related art, the insulating film attached to the outer surface of the single battery is usually a double-layer film (two layers of base material and two layers of acrylic glue structure). When the single battery is fixed with the side plate of the box body and the adjacent single battery, the insulating film on the outer surface of the single battery needs to be bonded therewith. When the single battery is subjected to vibration, the double-layer film is prone to fall off and cause failure, affecting the performance of the single battery. CONTENT OF THE UTILITY MODEL

[0003] To solve the above technical problems, embodiments of the present application provide a single battery, a battery and an electric device, which can improve the problem that the insulating film on the outer surface of the single battery is prone to fall off and cause failure, and ensure the performance of the single battery.

[0004] In a first aspect, a single battery is provided, comprising:

[0005] a shell comprising at least one first side wall, at least one second side wall and a bottom wall, the first side wall and the second side wall being connected with the bottom wall, the first side wall and the second side wall being adjacently arranged and connected with each other;

[0006] a double-layer film body covering at least part of the first side wall, at least part of the second side wall and the bottom wall;

[0007] a single-layer film body, part of the first side wall is not covered by the double-layer film body to form a first hollow area, the single-layer film body is attached to the first hollow area, and the single-layer film body attached to the first hollow area is used for bonding the side plate of the box body or the adjacent single battery; wherein the box body is used for accommodating the shell.

[0008] According to the first aspect of the present application, part of the second side wall is not covered by the double-layer film body to form a second hollow area, the single-layer film body is attached to the second hollow area, and the single-layer film body attached to the second hollow area is used for bonding the side plate of the box body or the adjacent single battery.

[0009] According to the first aspect of the present application, the side of the single-layer film body away from the shell is provided with bonding glue, and all of the bonding glue is located within the boundary range of the single-layer film body.

[0010] According to the first aspect of the present application, the double-layer film body and the single-layer film body have an overlapping portion.

[0011] According to the first aspect of the present application, the width of the overlapping part of the double-layer film body and the single-layer film body is L1, and the L1 satisfies: L1≥5mm.

[0012] According to the first aspect of the present application, the double-layer film body and the single-layer film body are spaced apart, and a gap is formed between the edge of the double-layer film body and the edge of the single-layer film body.

[0013] According to the first aspect of the present application, the shell comprises two oppositely arranged first side walls and two oppositely arranged second side walls, the double-layer film body covers the two second side walls, and the double-layer film body does not cover at least part of the two first side walls to form the first hollow area, and the single-layer film body is attached to the first hollow area.

[0014] According to the first aspect of the present application, the double-layer film body covers the two second side walls and part of the first side wall, and extends from the second side wall to the first side wall to cover part of the first side wall, and the part of the two first side walls not covered by the double-layer film body forms the first hollow area.

[0015] According to the first aspect of the present application, the double-layer film body covers the two oppositely arranged second side walls and one of the first side walls, and the double-layer film body extends from the second side wall to the other first side wall to cover part of the other first side wall and form the first hollow area.

[0016] According to the first aspect of the present application, the double-layer film body covers the bottom wall and is connected to the single-layer film body covering the first side wall and / or the second side wall.

[0017] According to the first aspect of the present application, the double-layer film body extends from the bottom wall to the first side wall to form an extension part, and the extension part partially covers the first side wall.

[0018] According to the first aspect of the present application, the single-layer film body and the extension part have an overlapping part; or,

[0019] The single-layer film body and the extension part are spaced apart, and a gap is formed between the edge of the single-layer film body and the edge of the extension part.

[0020] According to the first aspect of the present application, the single battery further comprises a top cover arranged on the top of the shell, and the double-layer film body covered by the first side wall near one end of the top cover extends to the top cover and covers part of the top cover.

[0021] The second aspect further provides a battery, comprising:

[0022] A box body;

[0023] The monomer battery as described in the foregoing embodiment, the single-layer film body is bonded with the side plate of the box body.

[0024] According to a second aspect of the present application, the number of the monomer batteries is multiple, and the single-layer film bodies of two adjacent monomer batteries are bonded with each other.

[0025] The third aspect further provides a power consumption device, comprising the battery as described in the foregoing embodiment.

[0026] The monomer battery, the battery and the power consumption device provided by the embodiments of the present application, in the first aspect, the single-layer film body is bonded with the side plate of the box body and / or the single-layer film body is bonded with the adjacent monomer battery, which avoids the problem that the two-layer film bodies of the double-layer film body are easily shaken off and cause failure, guarantees the connection stability between the monomer battery and the box body or guarantees the connection stability between the two adjacent monomer batteries, and guarantees the overall performance of the monomer battery; in the second aspect, the double-layer film body covers at least part of the first side wall, at least part of the second side wall and the bottom wall, and by virtue of the advantages that the double-layer film body is not easy to be warped at the corner of the shell and has better adhesion, the overall insulation performance of the monomer battery is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of embodiments of the present application when taken in conjunction with the accompanying drawings. The drawings provided in the present application are used to provide further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0028] Figure 1 The structural schematic diagram of the monomer battery provided by an exemplary embodiment of the present application.

[0029] Figure 2 The structural schematic diagram of the shell in a first perspective view provided by an exemplary embodiment of the present application.

[0030] Figure 3 The structural schematic diagram of the shell in a second perspective view provided by an exemplary embodiment of the present application.

[0031] Figure 4 The structural schematic diagram of the monomer battery without the single-layer film body in a first perspective view provided by an exemplary embodiment of the present application.

[0032] Figure 5 The structural schematic diagram of the single-layer film body and the double-layer film body provided by an exemplary embodiment of the present application.

[0033] Figure 6This is a schematic diagram of the structure of a single-cell battery after removing the single-layer film, provided as an exemplary embodiment of this application, from a second perspective.

[0034] Figure 7 A top view of a single battery cell provided for an exemplary embodiment of this application.

[0035] Reference numerals: 100-Single cell; 110-Casing; 111-First sidewall; 112-Second sidewall; 113-Bottom wall; 114-First hollow area; 120-Double-layer film; 121-Extension; 130-Single-layer film; 140-Top cover. Detailed Implementation

[0036] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0037] The battery provided in this application embodiment may include a casing and individual battery cells. The individual battery cells are housed within the casing, and the casing protects the individual battery cells. The individual battery cells are described in detail below.

[0038] Figure 1 This is a schematic diagram of the structure of a single battery provided for an exemplary embodiment of this application. Figure 2 A schematic diagram of the housing provided in an exemplary embodiment of this application from a first perspective. Figure 3 A schematic diagram of the housing provided in an exemplary embodiment of this application from a second perspective. Figure 4 This is a schematic diagram of the structure of a single-cell battery after removing the single-layer film, provided as an exemplary embodiment of this application, from a first-view perspective.

[0039] like Figures 1 to 4 As shown, the single battery 100 provided in this application embodiment may include a housing 110, which is disposed in the aforementioned box. The housing 110 includes at least one first sidewall 111, at least one second sidewall 112, and a bottom wall 113. The first sidewall 111 and the second sidewall 112 are both connected to the bottom wall 113. The first sidewall 111 and the second sidewall 112 are arranged adjacent to each other and connected to each other.

[0040] In one embodiment, the housing 110 can be a cuboid structure. Correspondingly, there are two first sidewalls 111, which are arranged opposite to each other, and there are two second sidewalls 112, which are arranged opposite to each other.

[0041] In one embodiment, the housing 110 may also be a pentagonal prism, a hexagonal prism, or the like.

[0042] like Figures 1 to 4As shown, the single battery 100 can further include a double-layer film body 120 and a single-layer film body 130, the double-layer film body 120 is attached to at least part of the first side wall 111, at least part of the second side wall 112 and the bottom wall 113, and part of the first side wall 111 is not covered by the double-layer film body 120 to form a first hollow area 114, and the single-layer film body 130 attached to the first hollow area 114 can be used to bond the side plate of the box or the adjacent single battery 100.

[0043] Specifically, in the first case, the single battery 100 is arranged adjacent to the side wall of the box, and the single-layer film body 130 attached to the first hollow area 114 is used to bond the side plate of the box, so that the assembly stability between the single battery 100 and the box can be improved; in the second case, a plurality of single batteries 100 (two or more single batteries 100) are arranged adjacent to each other, and the single-layer film body 130 attached to the first hollow area 114 in one of the single batteries 100 can be used to bond the adjacent single battery 100, thereby improving the assembly stability between the two adjacent single batteries 100.

[0044] It should be understood that, compared with the bonding scheme of the double-layer film body 120 (two layers of substrates and two layers of acrylic glue structure) and the side plate of the box or the bonding scheme of the double-layer film body 120 and the adjacent single battery 100, in the embodiment of the present application, since the single-layer film body 130 (single-layer substrate and single-layer acrylic glue) is a single-layer structure, after the single-layer film body 130 is bonded to the side plate of the box or the single-layer film body 130 is bonded to the adjacent single battery 100, it is not easy to be shaken off and fail, thereby effectively ensuring the connection stability between the single battery 100 and the box or the connection stability between the two adjacent single batteries 100, and ensuring the overall performance of the single battery 100.

[0045] The single battery 100 and the battery provided by the embodiment of the present application have the following advantages: in the first aspect, by bonding the single-layer film body 130 to the side plate of the box or bonding the single-layer film body 130 to the adjacent single battery 100, the problem of easy shaking off and failure between the two layers of the double-layer film body 120 is avoided, the connection stability between the single battery 100 and the box and / or the connection stability between the two adjacent single batteries 100 is ensured, and the overall performance of the single battery 100 is ensured; in the second aspect, by keeping the double-layer film body 120 covering at least part of the first side wall 111, at least part of the second side wall 112 and the bottom wall 113, and by virtue of the advantages that the double-layer film body 120 is not easy to be warped at the corner of the shell 110 and has better adhesion, the overall insulation performance of the single battery 100 is ensured.

[0046] In an embodiment, the shell 110 comprises two oppositely arranged first side walls 111 and two oppositely arranged second side walls 112, the double-layer film body 120 covers the two second side walls 112, and the two first side walls 111 are at least partially uncovered by the double-layer film body 120 (including that only one of the first side walls 111 is partially uncovered by the double-layer film body 120 or both of the first side walls 111 are partially uncovered by the double-layer film body 120), so as to form the aforementioned first hollowed-out area 114, and the single-layer film body 130 is attached to the first hollowed-out area 114.

[0047] In an embodiment, the double-layer film body 120 covers the two second side walls 112 and the two partial first side walls 111, that is, the double-layer film body 120 covers the entire two second side walls 112, covers part of the two first side walls 111, and uncovers part of the two first side walls 111, and the part uncovered by the double-layer film body 120 forms the first hollowed-out area 114. The double-layer film body 120 is bent and extended from the second side wall 112 to the first side wall 111, so that the part of the double-layer film body 120 covering the transition edge of the first side wall 111 and the second side wall 112 is not easy to be warped.

[0048] In an embodiment, the shell 110 comprises two oppositely arranged first side walls 111 and two oppositely arranged second side walls 112, the double-layer film body 120 covers the two oppositely arranged second side walls 112 and one of the first side walls 111, and the double-layer film body 120 is bent and extended from the second side wall 112 to the other first side wall 111 to cover part of the other first side wall 111 and form the first hollowed-out area 114, and the single-layer film body 130 is attached to the first hollowed-out area 114. In this way, on the one hand, the double-layer film body 120 covers the two oppositely arranged second side walls 112 and one of the first side walls 111, which can increase the covering area of the double-layer film body 120 on the shell 110 and make full use of the advantages that the double-layer film body 120 is not easy to be warped at the corner of the shell 110 and has better adhesion; on the other hand, part of the one of the first side walls 111 is covered by the single-layer film body 130, which can use the single-layer film body 130 to bond the side plate of the box body or the adjacent single battery 100 on the corresponding side.

[0049] In an embodiment, the shell 110 comprises two oppositely arranged first side walls 111 and two oppositely arranged second side walls 112, the double-layer film body 120 covers the two second side walls 112, and the two first side walls 111 are at least partially uncovered by the double-layer film body 120 to form the aforementioned first hollowed-out area 114, and the double-layer film body 120 also covers the bottom wall 113 and is connected with the single-layer film body 130 covering the first side wall 111 and / or the second side wall 112, so as to improve the overall strength of the single-layer film body 130 and the double-layer film body 120 and reduce the probability of the single-layer film body 130 being wrinkled and torn.

[0050] As shown in Figure 1 and Figure 4 , the double-layer film body 120 is bent and extended from the bottom wall 113 to the first side wall 111 to form an extension 121, and the extension 121 partially covers the first side wall 111. That is, the extension 121 can cover the transition edge between the first side wall 111 and the bottom wall 113. In this way, the bent and extended extension 121 avoids the single-layer film body 130 on the first side wall 111 and the double-layer film body 120 on the bottom wall 113 from being connected at the transition edge, and can effectively ensure good insulation performance.

[0051] Specifically, in an embodiment, the film covering process can include: first, using the double-layer film body 120 to cover the bottom wall 113 and the second side wall 112, and then bending and extending part of the double-layer film body 120 from the bottom wall 113 to the first side wall 111 to form the extension 121; bending and extending another part of the double-layer film body 120 from the second side wall 112 to the first side wall 111 to form the first hollow area 114 together with the aforementioned extension 121; bending and extending another part of the double-layer film body 120 from the second side wall 112 to the top cover 140; then, using the single-layer film body 130 to cover the first hollow area 114, and the single-layer film body 130 and the bent part of the double-layer film body 120 overlapping each other; and then bending and extending part of the single-layer film body 130 from the first hollow area 114 to the top cover 140.

[0052] As shown in Figure 1 and Figure 4 , the single-layer film body 130 and the extension 121 overlap each other, which can ensure that the double-layer film body 120 and the single-layer film body 130 completely insulate the first side wall 111 and the second side wall 112, effectively improve the insulation effect, and at the same time improve the strength of the single-layer film body 130 and the double-layer film body 120 as a whole, and reduce the probability of the single-layer film body 130 being wrinkled and torn.

[0053] In an embodiment, the single-layer film body 130 and the extension 121 can also be spaced apart, that is, a gap is formed between the edge of the single-layer film body 130 and the edge of the extension 121. In this way, the single-layer film body 130 and the extension 121 do not overlap each other, which can prevent the first side wall 111 and / or the second side wall 112 from being uneven due to the partial overlap of the single-layer film body 130 and the extension 121.

[0054] In an embodiment, part of the second side wall 112 is not covered by the double-layer film body 120 to form a second hollowed-out area (not shown in the figure), and the single-layer film body 130 attached to the second hollowed-out area is used to bond the side plate of the box or the adjacent single battery 100. In the first case, the single-layer film body 130 attached to the second hollowed-out area and the single-layer film body 130 attached to the first hollowed-out area 114 are used to bond the two adjacent side plates of the box, respectively, so as to further improve the assembly reliability between the single battery 100 and the box; in the second case, a plurality of single batteries 100 are arranged in an array, the single-layer film body 130 attached to the first hollowed-out area 114 is used to bond the adjacent single batteries 100 distributed along the first direction, and the single-layer film body 130 attached to the second hollowed-out area is used to bond the adjacent single batteries 100 distributed along the second direction, and the included angle between the first direction and the second direction is in the range of 0-90°.

[0055] It should be noted that the side of the single-layer film body 130 away from the shell 110 (i.e., the side of the single-layer film body 130 used to bond the side plate of the box or the adjacent single battery 100) is provided with adhesive, and all of the adhesive is located within the boundary range of the single-layer film body 130. In this way, when the single-layer film body 130 is bonded to the side plate of the box or the adjacent single battery 100, the adhesive is not easy to overflow the edge of the single-layer film body 130, and the adhesive will not cause the surface of the double-layer film body 120 to appear, thereby avoiding the adhesive driving the two layers of the double-layer film body 120 apart.

[0056] Figure 5 The structure diagram of the single-layer film body and the double-layer film body provided by an exemplary embodiment of the present application is shown in the figure. Figure 1 and Figure 5 As shown in the figures, the double-layer film body 120 and the single-layer film body 130 have an overlapping portion (which can overlap the first side wall 111 or the second side wall 112), so as to ensure that the double-layer film body 120 and the single-layer film body 130 completely insulate the first side wall 111 and the second side wall 112, and effectively improve the insulation effect.

[0057] It should be noted that if the width of the overlapping portion of the double-layer film body 120 and the single-layer film body 130 is too small, it may affect the connection strength between the double-layer film body 120 and the single-layer film body 130, and easily cause the double-layer film body 120 and the single-layer film body 130 to separate from each other. Therefore, it is necessary to limit the width of the overlapping portion of the double-layer film body 120 and the single-layer film body 130 within a certain range. Specifically, as shown in the figure, Figure 5 the width of the overlapping portion of the double-layer film body 120 and the single-layer film body 130 is L1, and L1 satisfies: L1≥5mm. In this way, the mutual separation between the double-layer film body 120 and the single-layer film body 130 can be effectively prevented.

[0058] In an embodiment, the double-layer film body 120 and the single-layer film body 130 can also be spaced apart, i.e., a gap is formed between the edge of the double-layer film body 120 and the edge of the single-layer film body 130, so that there is no overlapping part between the double-layer film body 120 and the single-layer film body 130, and the unevenness of the first side wall 111 and / or the second side wall 112 caused by the partial overlapping of the double-layer film body 120 and the single-layer film body 130 can be prevented.

[0059] Figure 6 A structure schematic view of the single battery without the single-layer film body under a second viewing angle is provided for an exemplary embodiment of the present application. As shown in the figure, the width of the first hollow area 114 is A, and the width of the first side wall 111 is B. If the ratio of A / B is too small, the width of the first hollow area 114 will be small, and the coverage area of the single-layer film body 130 will be small, thereby affecting the adhesion effect of the single-layer film body 130 to the side plate of the box body or the single battery 100. Therefore, in the embodiment of the present application, A and B satisfy the following relationship: A / B≥1 / 3. In this way, the situation that the adhesion effect of the single-layer film body 130 is affected due to the small width of the first hollow area 114 can be effectively avoided. Figure 6

[0060] Figure 7 A top view of the single battery is provided for an exemplary embodiment of the present application. As shown in the figure, Figure 7 The single battery 100 can also include a top cover 140 arranged at the top of the shell 110. The double-layer film body 120 covered by the first side wall 111 near one end of the top cover 140 is bent and extended to the top cover 140 and covers part of the top cover 140. In this way, the edge of the double-layer film body 120 bent and extended to the top wall can make the part of the single-layer film body 130 covering the transition edge of the top cover 140 and the first side wall 111 not easy to be warped.

[0061] An electric device is also provided in an embodiment of the present application, which includes the battery described in the foregoing embodiments and has all the functions of the battery. The beneficial effects of the electric device can refer to the beneficial effects of the battery.

[0062] In an embodiment, the battery cell described above can be a lithium ion battery, a sodium ion battery or a magnesium ion battery, and the external contour thereof can be a cylinder, a flat body, a cuboid or other shapes, but is not limited thereto.

[0063] ​In an embodiment, the battery described above can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and a plurality of battery monomers. The plurality of battery monomers can be electrically connected in series, in parallel, or in a mixed manner of series and parallel, and are communicatively connected with the battery management system to form the battery pack, and the battery management system controls and monitors the working state of each battery monomer. In addition, the plurality of battery monomers can be first connected in series and / or in parallel, and form a battery module with the module management system, and then a plurality of battery modules are electrically connected in series, in parallel, or in a mixed manner of series and parallel, and are connected with the battery management system to form the battery pack.

[0064] In an embodiment, the power consuming device described above includes the battery described above and can be powered by the battery. The power consuming device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, an amusement device, an elevator, and a lifting device, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, or an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The energy storage device can be an energy storage wall, a base station energy storage, a container energy storage, etc. The amusement device can be a carousel, a jump machine, etc. The present application does not specially limit the power consuming device.

[0065] The basic principles of the present application are described above in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects, etc. cannot be considered as the must-have of each embodiment of the present application. In addition, the above-mentioned specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the above-mentioned specific details, and the above-mentioned specific details are not limited to the above-mentioned specific details.

[0066] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0067] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0068] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0069] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A single cell, characterized by, The shell (110) comprises at least one first side wall (111), at least one second side wall (112), and a bottom wall (113), the first side wall (111) and the second side wall (112) are connected with the bottom wall (113), and the first side wall (111) and the second side wall (112) are arranged adjacent to each other and are connected with each other; The double-layer film body (120) is wrapped on at least part of the first side wall (111), at least part of the second side wall (112), and the bottom wall (113); The single-layer film body (130) is attached to the first hollow area (114), and the single-layer film body (130) attached to the first hollow area (114) is used for bonding the side plate of the box body or the adjacent single battery. Part of the second side wall (112) is not wrapped with the double-layer film body (120) to form a second hollow area, and the second hollow area is attached with the single-layer film body (130), and the single-layer film body (130) attached to the second hollow area is used for bonding the side plate of the box body or the adjacent single battery.

2. The cell according to claim 1, wherein The single-layer film body (130) is provided with bonding glue on the side away from the shell (110), and all of the bonding glue is located within the boundary range of the single-layer film body (130).

3. The cell according to claim 1 or 2, characterized in that, The double-layer film body (120) and the single-layer film body (130) have an overlapping part.

4. The cell according to claim 1 or 2, characterized by The width of the overlapping part of the double-layer film body (120) and the single-layer film body (130) is L1, and the L1 satisfies: L1≥5mm.

5. The cell according to claim 4, wherein The double-layer film body (120) and the single-layer film body (130) are distributed in a spaced manner, and a gap is formed between the edges of the double-layer film body (120) and the edges of the single-layer film body (130).

6. The cell according to claim 1 or 2, wherein The shell (110) comprises two oppositely arranged first side walls (111) and two oppositely arranged second side walls (112), the double-layer film body (120) wraps two second side walls (112), and two first side walls (111) are at least partially unwrapped with the double-layer film body (120) to form the first hollow area (114), and the first hollow area (114) is attached with the single-layer film body (130).

7. The cell according to claim 1, wherein The double-layer film body (120) wraps two second side walls (112) and two parts of the first side wall (111), and is bent and extended from the second side wall (112) to the first side wall (111) to wrap part of the first side wall (111), and the part of the two first side walls (111) not wrapped with the double-layer film body (120) forms the first hollow area (114).

8. The cell according to claim 7, wherein ​ 9. The cell according to claim 7, wherein The double-layer film body (120) covers two opposite second side walls (112) and one of the first side walls (111), and the double-layer film body (120) is bent and extends from the second side wall (112) to the other first side wall (111) to cover part of the other first side wall (111) and form the first hollow area (114).

10. The single cell according to any one of claims 7 to 9, characterized in that, The double-layer film body (120) covers the bottom wall (113) and is connected with the single-layer film body (130) covering the first side wall (111) and / or the second side wall (112).

11. The cell according to claim 10, wherein The double-layer film body (120) is bent and extends from the bottom wall (113) to the first side wall (111) to form an extension (121), and the extension (121) partially covers the first side wall (111).

12. The cell according to claim 11, wherein The single-layer film body (130) and the extension (121) have an overlapping part; or The single-layer film body (130) and the extension (121) are spaced apart, and a gap is formed between the edge of the single-layer film body (130) and the edge of the extension (121).

13. The cell according to any one of claims 7 to 9, wherein, The single battery further comprises a top cover (140) arranged on the top of the shell (110), and the double-layer film body (120) covering the first side wall (111) near one end of the top cover (140) is bent and extends to the top cover (140) and covers part of the top cover (140).

14. A battery, characterized by It comprises: a box; The single battery according to any one of claims 1 to 13, wherein the single-layer film body (130) is bonded to the side plate of the box.

15. The battery of claim 14, wherein, A plurality of single batteries, and the single-layer film bodies (130) of two adjacent single batteries are bonded to each other.

16. An electrical device, characterized by It comprises the battery according to claim 14 or 15.

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