Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. The battery comprises a battery cell and a battery cover, the shell comprises a main body part, a first folded edge part and a second folded edge part, the main body part is provided with a storage cavity, the battery cell is arranged in the storage cavity, the first folded edge part is connected and attached to one side of the main body part in the width direction, the second folded edge part is connected and attached to the other side of the main body part in the width direction, the first folded edge part comprises a first overlapping area, and the second folded edge part comprises a second overlapping area along the width direction of the battery cell; the distance between the first overlapping area and the second folding edge part is the maximum width of the shell; wherein the first overlapping area comprises a first outer layer, a first metal layer, a first heat sealing layer, a first metal layer and a first outer layer which are arranged in a stacked mode, the main body part comprises a second outer layer, a second metal layer and a second heat sealing layer which are arranged in a stacked mode, the thickness of the first heat sealing layer is L1, the thickness of the second heat sealing layer is L2, and L1 is smaller than 2L2. The battery provided by the utility model can have relatively high energy density.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology

[0002] In related technologies, a battery includes a casing and a battery cell. The casing can be an aluminum-plastic film. The battery manufacturing process can involve punching indentations in the aluminum-plastic film, then placing the battery cell into the aluminum-plastic film for liquid injection and encapsulation, and finally folding the effective sealing area. Folding the aluminum-plastic film increases the battery's width dimension, thereby reducing its energy density. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery capable of having a high energy density.

[0004] This utility model also proposes an electrical device.

[0005] The battery according to a first aspect embodiment of the present invention includes:

[0006] Battery cell;

[0007] The housing includes a main body, a first folded edge, and a second folded edge. The main body has a storage cavity, and the battery cell is disposed in the storage cavity. The first folded edge is connected to and adheres to one side of the main body in the width direction, and the second folded edge is connected to and adheres to the other side of the main body in the width direction. The first folded edge includes a first overlapping area. Along the width direction of the battery cell, the distance between the first overlapping area and the second folded edge is the maximum width of the housing. The first overlapping area includes a first outer layer, a first metal layer, a first heat-sealing layer, and the first outer layer stacked together. The main body includes a second outer layer, a second metal layer, and a second heat-sealing layer stacked together. The thickness of the first heat-sealing layer is L1, and the thickness of the second heat-sealing layer is L2, where L1 < 2L2.

[0008] The battery according to the embodiments of this utility model has at least the following beneficial effects: the battery cell can be packaged in a storage cavity, wherein the first folded edge is attached to one side of the main body in the width direction, and the second folded edge is attached to the other side of the main body in the width direction. The distance between the first overlapping area and the second folded edge is the maximum width of the casing. In the prior art, the thickness of the first heat-sealing layer at the first overlapping area is equal to twice the thickness of the second heat-sealing layer. However, in this application, the thickness of the first heat-sealing layer is less than twice the thickness of the second heat-sealing layer, that is, the first heat-sealing layer has been thickened. Thus, by reducing the thickness of the first heat-sealing layer, the distance between the first overlapping area and the second folded edge can be reduced, further reducing the size of the casing and increasing the size of the battery cell, thereby ultimately improving the energy density of the battery. Specifically, the battery can have a high energy density.

[0009] According to some embodiments of the present invention, the battery has a first thinning groove provided on the first outer layer away from the main body.

[0010] According to some embodiments of the present invention, the depth of the first thinning groove in the battery is B, where 0 < B < 0.02 mm.

[0011] According to some embodiments of the present invention, the second folded edge of the battery includes a second overlapping area. Along the width direction of the battery cell, the distance between the first overlapping area and the second overlapping area is the maximum width of the casing. The second overlapping area includes a third outer layer, a third metal layer, a third heat-sealing layer, the third metal layer, and the third outer layer stacked together. The thickness of the third heat-sealing layer is L3, where L3 < 2L2.

[0012] According to some embodiments of the present invention, the battery has a second thinning groove provided on the third outer layer away from the main body.

[0013] According to some embodiments of the present invention, the depth of the second thinning groove in the battery is C, where 0 < C < 0.02 mm.

[0014] According to some embodiments of the present invention, the battery has a diameter of 0.022mm ≤ 2L2-L3 ≤ 0.042mm.

[0015] According to some embodiments of the present invention, the battery diameter is 0.022mm ≤ 2L2-L1 ≤ 0.042mm.

[0016] According to some embodiments of the present invention, the battery has a main body portion with a dimension of H along its thickness direction, and a first overlapping area with a dimension of K, where 0.5H-0.8mm≤K≤0.5H+0.8mm.

[0017] The electrical device according to the second aspect of the present invention includes the battery described in any one of the first aspect embodiments.

[0018] The electrical device according to the embodiments of this utility model has at least the following beneficial effects: the battery cell can be packaged in a storage cavity, wherein the first folded edge is attached to one side of the main body in the width direction, and the second folded edge is attached to the other side of the main body in the width direction. The distance between the first overlapping area and the second folded edge is the maximum width of the shell. In the prior art, the thickness of the first heat-sealing layer at the first overlapping area is equal to twice the thickness of the second heat-sealing layer. However, in this application, the thickness of the first heat-sealing layer is less than twice the thickness of the second heat-sealing layer, that is, the first heat-sealing layer has been thickened. Thus, by reducing the thickness of the first heat-sealing layer, the distance between the first overlapping area and the second folded edge can be reduced, further reducing the size of the shell and increasing the size of the battery cell, thereby ultimately improving the energy density of the battery. Specifically, the battery can have a high energy density. Furthermore, the electrical device with this battery has a better battery life.

[0019] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a partial schematic diagram of the battery casing in some embodiments of the present invention;

[0022] Figure 2 This is a schematic diagram of the battery casing in some embodiments of the present invention;

[0023] Figure 3 This is a partial schematic diagram of the first folded edge portion of the battery in the first embodiment of this utility model;

[0024] Figure 4 This is a partial schematic diagram of the second folded edge in a battery according to some embodiments of the present invention;

[0025] Figure 5 This is a partial schematic diagram of the main body of the battery in some embodiments of the present invention;

[0026] Figure 6 This is a partial schematic diagram of the first folded edge portion of the battery in the second embodiment of this utility model;

[0027] Figure 7 This is a partial schematic diagram of the first folded edge portion of the battery in the third embodiment of this utility model.

[0028] Figure label:

[0029] The shell 100, main body 110, storage cavity 120, second outer layer 130, second metal layer 140, second heat-sealing layer 150, first folded edge 200, first overlapping area 210, normal area 220, first outer layer 230, first thinning groove 231, first metal layer 240, first heat-sealing layer 250, second folded edge 300, second overlapping area 310, third outer layer 320, second thinning groove 321, third metal layer 330, and third heat-sealing layer 340. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Please refer to Figures 1 to 7 In some embodiments, the battery includes: a battery cell (not shown) and a casing 100. The battery cell includes a positive electrode, a separator, and a negative electrode. The separator is located between the positive and negative electrode. The positive and negative electrode sheets are stacked and then wound to form a wound battery cell structure. Multiple positive and negative electrode sheets can be provided, and multiple positive and negative electrode sheets are alternately stacked to form a stacked battery cell structure. The casing 100 can be an aluminum-plastic film. Please refer to... Figures 1 to 2 The housing 100 has the following specific structure: it includes a main body 110, a first folded edge 200, and a second folded edge 300. The main body 110 has a storage cavity 120, in which the battery cell is disposed. The storage cavity 120 can be formed by perforating an aluminum-plastic film. When the battery cell is encapsulated in the storage cavity 120, the two side seals of the aluminum-plastic film respectively form the first folded edge 200 and the second folded edge 300. Specifically, both the first folded edge 200 and the second folded edge 300 are formed by heat sealing two layers of aluminum-plastic film, while the main body 110 is formed by perforating a single layer of aluminum-plastic film. The first folded edge 200 is connected to and adheres to one side of the main body 110 in the width direction, and the second folded edge 300 is connected to and adheres to the other side of the main body 110 in the width direction. The surfaces on both sides of the main body 110 in the width direction are convex surfaces, meaning the convex surfaces protrude outwards relative to the storage cavity 120. It is conceivable that after the first folded edge 200 is attached to one side of the main body 110 in the width direction, the first folded edge 200 and the cavity wall of the storage cavity 120 overlap in the width direction. That is, the first folded edge 200 includes a first overlapping area 210. Along the width direction of the battery cell, the distance between the first overlapping area 210 and the second folded edge 300 is the maximum width of the housing 100. That is, the maximum width of the housing 100 is the size of the main body 110 plus the size of the first folded edge 200 plus the size of the second folded edge 300 along the width direction of the battery cell. The maximum width can be D. Please refer to... Figure 3 The first overlapping area 210 includes a first outer layer 230, a first metal layer 240, a first heat-sealing layer 250, and a first outer layer 230, all stacked together. The first outer layer 230 can be a nylon layer, the first metal layer 240 can be an aluminum layer, and the first heat-sealing layer 250 can be a PP layer. Please refer to... Figure 5 The main body 110 includes a second outer layer 130, a second metal layer 140, and a second heat-sealing layer 150 stacked together. The second outer layer 130 may be a nylon layer, the second metal layer 140 may be an aluminum layer, and the second heat-sealing layer 150 may be a PP layer. The thickness of the first heat-sealing layer 250 is L1, and the thickness of the second heat-sealing layer 150 is L2, where L1 < 2L2. Specifically, the battery cell can be packaged in the storage cavity 120. The first folded edge 200 is attached to one side of the main body 110 in the width direction, and the second folded edge 300 is attached to the other side of the main body 110 in the width direction. The distance between the first overlapping area 210 and the second folded edge 300 is the maximum width of the casing 100. In the prior art, the thickness of the first heat-sealing layer 250 at the first overlapping area 210 is equal to twice the thickness of the second heat-sealing layer 150. However, in this application, the thickness of the first heat-sealing layer 250 is less than twice the thickness of the second heat-sealing layer 150, meaning the first heat-sealing layer 250 has been thickened. Thus, by reducing the thickness of the first heat-sealing layer 250, the distance between the first overlapping area 210 and the second folded edge 300 can be reduced, further reducing the size of the casing 100 and increasing the size of the battery cell, thereby ultimately increasing the energy density of the battery. Specifically, the battery can have a high energy density.

[0036] Furthermore, since L1 < 2L2, the gain of the battery in the width direction can be 2L2 - L1, for example, 2L2 - L1 equals 30μm, 25μm, 20μm, 15μm, 10μm, or 5μm. In some other embodiments, (0.35~0.5) = L1 / 2L2.

[0037] Furthermore, the thickness of the first heat-sealing layer 250 can be controlled by the heat-sealing head. For example, when heat-sealing the housing 100, the pressure on the heat-sealing head can be increased, thereby pressing the first heat-sealing layer 250 tightly and reducing its thickness to achieve L1 < 2L2. Alternatively, the thickness of the first heat-sealing layer 250 can be reduced before heat-sealing the aluminum-plastic film. In this way, the final thickness L1 of the first heat-sealing layer 250 formed during heat sealing will also be less than 2L2.

[0038] Furthermore, to further improve the energy density of the battery, the first outer layer 230 can be thinned. For details, please refer to... Figures 1 to 3In some embodiments, a first thinning groove 231 is provided on the first outer layer 230 away from the main body 110. The first overlapping area 210 includes two first outer layers 230, one of which is bonded to the main body 110, and the other is farther away from the main body 110. Specifically, the first outer layer 230 away from the main body 110 refers to the first outer layer 230 in the first overlapping area 210 that is farthest from the main body 110. Providing the first thinning groove 231 on this first outer layer 230 can effectively reduce the width of the housing 100. That is, the maximum width of the housing 100 refers to the distance between the bottom wall of the first thinning groove 231 and the second folded edge 300 in the width direction of the battery cell. The bottom wall of the first thinning groove 231 refers to the wall opposite to the opening of the first thinning groove 231. The shape of the first thinning groove 231 can be a cube or a cuboid. The first thinning groove 231 can be manufactured by laser processing.

[0039] Furthermore, in some embodiments, the depth of the first thinning groove 231 is B, where 0 < B < 0.02 mm. Specifically, B can be 0.01 mm, 0.011 mm, 0.012 mm, 0.013 mm, 0.014 mm, 0.015 mm, 0.016 mm, 0.017 mm, 0.018 mm, or 0.019 mm. When the depth of the first thinning groove 231 is greater than 0.02 mm, this will result in excessively low strength of the first outer layer 230, which may affect the battery's encapsulation effect and reduce its reliability.

[0040] Furthermore, after the second folded edge 300 is attached to the other side of the main body 110 in the width direction, the second folded edge 300 and the cavity wall of the storage cavity 120 overlap in the width direction. Therefore, please refer to Figure 1 , Figure 2 and Figure 4In some embodiments, the second folded edge 300 includes a second overlapping region 310. Along the width direction of the battery cell, the distance between the first overlapping region 210 and the second overlapping region 310 is the maximum width of the housing 100. The second overlapping region 310 includes a third outer layer 320, a third metal layer 330, and a third heat-sealing layer 340, all stacked together. The third outer layer 320 may be a nylon layer, the first metal layer 240 may be an aluminum layer, and the first heat-sealing layer 250 may be a PP layer. The thickness of the third heat-sealing layer 340 is L3, where L3 < 2L2. Specifically, in the prior art, the thickness of the third heat-sealing layer 340 at the second overlap region 310 is equal to twice the thickness of the second heat-sealing layer 150. However, in this application, the thickness of the third heat-sealing layer 340 is less than twice the thickness of the second heat-sealing layer 150. That is, the thickness of the third heat-sealing layer 340 has been reduced. In this way, by reducing the thickness of the third heat-sealing layer 340, the distance between the first overlap region 210 and the second overlap region 310 can be reduced, further reducing the size of the casing 100 and increasing the size of the cell, thereby ultimately increasing the energy density of the battery.

[0041] Furthermore, the thickness of the third heat-sealing layer 340 can be controlled by the heat-sealing head. For example, when heat-sealing the housing 100, the pressure on the heat-sealing head can be increased, thereby pressing the third heat-sealing layer 340 tightly and reducing its thickness to achieve L1 < 2L2. Alternatively, the thickness of the third heat-sealing layer 340 can be reduced before heat-sealing the aluminum-plastic film. In this way, the final thickness L1 of the third heat-sealing layer 340 formed during heat sealing will also be less than 2L2.

[0042] Furthermore, to further improve the energy density of the battery, a second thinning groove 321 can be provided on the third outer layer 320. For details, please refer to... Figure 4 In some embodiments, a second thinning groove 321 is provided on the third outer layer 320 away from the main body 110. The second overlapping region 310 includes two third outer layers 320, one of which is bonded to the main body 110, and the other is farther away from the main body 110. Specifically, the third outer layer 320 away from the main body 110 refers to the third outer layer 320 in the second overlapping region 310 that is farthest from the main body 110. Providing the second thinning groove 321 on this third outer layer 320 can effectively reduce the width of the housing 100. That is, the maximum width of the housing 100 refers to the distance between the bottom walls of the first thinning groove 231 and the second thinning groove 321 in the width direction of the battery cell. The bottom wall of the second thinning groove 321 refers to the wall opposite to the opening of the second thinning groove 321. The shape of the second thinning groove 321 can be a cube or a cuboid. The second thinning groove 321 can be manufactured by laser processing.

[0043] Furthermore, in some embodiments, the depth of the second thinning groove 321 is C, where 0 < C < 0.02 mm. Specifically, C can be 0.01 mm, 0.011 mm, 0.012 mm, 0.013 mm, 0.014 mm, 0.015 mm, 0.016 mm, 0.017 mm, 0.018 mm, or 0.019 mm. When the depth of the second thinning groove 321 is greater than 0.02 mm, this will result in excessively low strength of the third outer layer 320, which may affect the battery's encapsulation effect and reduce its reliability.

[0044] Furthermore, in some embodiments, 0.022mm ≤ 2L2-L3 ≤ 0.042mm. Specifically, 2L2-L3 can be 0.022mm, 0.023mm, 0.024mm, 0.025mm, 0.026mm, 0.027mm, 0.028mm, 0.029mm, 0.030mm, 0.031mm, 0.032mm, 0.033mm, 0.034mm, 0.035mm, 0.036mm, 0.037mm, 0.038mm, 0.039mm, 0.040mm, 0.041mm, or 0.042mm. When 2L2-L3 is less than 0.022mm, it is conceivable that the size of L3 is larger, which results in a smaller increase in cell volume and thus a lower energy density of the battery. When 2L2-L3 is greater than 0.042mm, the size of L3 is small. Although this can increase the energy density of the battery, it will lead to insufficient battery sealing.

[0045] Furthermore, in some embodiments, 0.022mm ≤ 2L2 - L1 ≤ 0.042mm. Specifically, 2L2 - L1 can be 0.022mm, 0.023mm, 0.024mm, 0.025mm, 0.026mm, 0.027mm, 0.028mm, 0.029mm, 0.030mm, 0.031mm, 0.032mm, 0.033mm, 0.034mm, 0.035mm, 0.036mm, 0.037mm, 0.038mm, 0.039mm, 0.040mm, 0.041mm, or 0.042mm. When 2L2 - L1 is less than 0.022mm, it is conceivable that the size of L1 is relatively large, which results in a smaller increase in cell volume and thus a lower energy density of the battery. When 2L2-L1 is greater than 0.042mm, the size of L1 is small. Although this can increase the energy density of the battery, it will lead to insufficient battery sealing.

[0046] Further, please refer to Figure 1 , Figure 6 and Figure 7 The first folded edge portion 200 also includes a normal area 220, which connects to the first overlapping area 210. There may be one normal area 220 located at the end of the first folded edge portion 200, or there may be two normal areas 220, each connecting to one end of the first overlapping area 210. The first heat-sealing layer 250 at the normal area 220 is untreated. The normal area 220 includes a second outer layer 130, a second metal layer 140, a second heat-sealing layer 150, and a second outer layer 130 stacked together. The normal area 220 is attached to one side of the main body portion 110 in the width direction. Compared to the first overlapping area 210, the normal area 220 provides better encapsulation. The normal area 220 can improve the battery's encapsulation effect. The distance between the normal area 220 and the second folded edge portion 300 in the cell width direction is not the maximum width of the casing 100. Specifically, in some embodiments, along the thickness direction of the main body 110, the size of the main body 110 is H, and the size of the first overlapping area 210 is K, where 0.5H-0.8mm≤K≤0.5H+0.8mm. Specifically, K can be 0.5H-0.8mm, 0.5H-0.7mm, 0.5H-0.6mm, 0.5H-0.5mm, 0.5H-0.4mm, 0.5H-0.3mm, 0.5H-0.2mm, 0.5H-0.1mm, 0.5Hmm, 0.5H+0.1mm, 0.5H+0.2mm, 0.5H+0.3mm, 0.5H+0.4mm, 0.5H+0.5mm, 0.5H+0.6mm, 0.5H+0.7mm, or 0.5H+0.8mm. It is conceivable that the side of the main body 110 is a convex surface. If the dimension of the first overlapping area 210 in the thickness direction of the main body 110 is too small, it may result in the maximum width of the casing 100 being the distance between the normal area 220 and the second folded edge 300 in the cell width direction. Therefore, K cannot be too small. Similarly, K cannot be too large either. If K is too large, the dimension of the normal area 220 will be small, which will lead to poor battery encapsulation. In addition, it should be noted that the structure of the second folded edge 300 can be consistent with the structure of the first folded edge 200. To further add, Figure 6 The structure of the first folded edge 200 has the advantage of being easy to process. Figure 7 The first folded edge 200 has a good structural packaging effect. In actual products, the first folded edge 200 can be made into a specific shape as needed. Figure 6 or Figure 7 The structure.

[0047] In some embodiments, the electrical device includes a battery according to any of the above embodiments. Specifically, the battery cell can be packaged in the storage cavity 120, wherein the first folded edge 200 is attached to one side of the main body 110 in the width direction, and the second folded edge 300 is attached to the other side of the main body 110 in the width direction. The distance between the first overlapping area 210 and the second folded edge 300 is the maximum width of the housing 100. In the prior art, the thickness of the first heat-sealing layer 250 at the first overlapping area 210 is equal to twice the thickness of the second heat-sealing layer 150. However, in this application, the thickness of the first heat-sealing layer 250 is less than twice the thickness of the second heat-sealing layer 150, that is, the thickness of the first heat-sealing layer 250 has been reduced. Thus, by reducing the thickness of the first heat-sealing layer 250, the distance between the first overlapping area 210 and the second folded edge 300 can be reduced, further reducing the size of the housing 100 and increasing the size of the battery cell, thereby ultimately increasing the energy density of the battery. Specifically, the battery can have a high energy density. Furthermore, electrical devices equipped with this battery have better battery life.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized in that, include: Battery cell; The housing includes a main body, a first folded edge, and a second folded edge. The main body has a storage cavity, and the battery cell is disposed in the storage cavity. The first folded edge is connected to and adheres to one side of the main body in the width direction, and the second folded edge is connected to and adheres to the other side of the main body in the width direction. The first folded edge includes a first overlapping area. Along the width direction of the battery cell, the distance between the first overlapping area and the second folded edge is the maximum width of the housing. The first overlapping area includes a first outer layer, a first metal layer, a first heat-sealing layer, and the first outer layer stacked together. The main body includes a second outer layer, a second metal layer, and a second heat-sealing layer stacked together. The thickness of the first heat-sealing layer is L1, and the thickness of the second heat-sealing layer is L2, where L1 < 2L2.

2. The battery according to claim 1, characterized in that, The first outer layer, which is away from the main body, is provided with a first thinning groove.

3. The battery according to claim 2, characterized in that, The depth of the first thinning groove is B, where 0 < B < 0.02 mm.

4. The battery according to claim 1, characterized in that, The second folded edge includes a second overlapping area. Along the width direction of the battery cell, the distance between the first overlapping area and the second overlapping area is the maximum width of the housing. The second overlapping area includes a third outer layer, a third metal layer, a third heat-sealing layer, the third metal layer, and the third outer layer stacked together. The thickness of the third heat-sealing layer is L3, where L3 < 2L2.

5. The battery according to claim 4, characterized in that, A second thinning groove is provided on the third outer layer away from the main body.

6. The battery according to claim 5, characterized in that, The depth of the second thinning groove is C, where 0 < C < 0.02 mm.

7. The battery according to claim 4, characterized in that, 0.022mm≤2L2-L3≤0.042mm.

8. The battery according to claim 1, characterized in that, 0.022mm≤2L2-L1≤0.042mm.

9. The battery according to claim 1, characterized in that, Along the thickness direction of the main body, the size of the main body is H, and the size of the first overlapping area is K, where 0.5H-0.8mm≤K≤0.5H+0.8mm.

10. Electrical equipment, characterized in that, The battery includes any one of claims 1 to 9.

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