Battery and electronic device including the same

Abstract

A battery includes a pole piece and a housing for housing the pole piece. The pole piece includes a negative pole piece located on the outermost layer. The negative pole piece includes a first side and a second side extending in mutually perpendicular directions. A third side connects the first side and the second side, and the first side intersects the third side to form a first intersection point. The housing includes a first wall, a second wall, and a third wall that are interconnected. The first wall and the second wall are connected by a first arc wall, the first wall and the third wall are connected by a second arc wall, and the second wall and the third wall are connected by a third arc wall. The arc radius of the first arc wall is R1, the arc radius of the second arc wall is R2. The midpoint connection lines of each part of the first arc wall, the midpoint connection lines of each part of the second arc wall, and the midpoint connection lines of each part of the third arc wall intersect to form a second intersection point. The projection of the second intersection point on the first surface of the electrode assembly is a third intersection point. The distance L between the third intersection point and the first intersection point satisfies the relationship L≥0.8(R1 + R2).

Description

Technical Field

[0001] The present application relates to the field of energy storage devices, and more particularly to a battery and an electronic device including the battery. Background Art

[0002] Lithium-ion batteries have many advantages such as high energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and are widely used in the field of consumer electronics. With the rapid development of electric vehicles and portable electronic devices in recent years, people's requirements for related properties of batteries such as energy density, service life, and manufacturing efficiency are getting higher and higher. Therefore, the structure of the battery needs to be continuously optimized. Summary of the Invention

[0003] An object of the present application is to provide a battery that can improve the service life of the housing.

[0004] A battery is provided in a first aspect of the present application, including an electrode assembly and a housing that houses the electrode assembly. The electrode assembly includes electrode plates and a first layer containing an insulating material. The electrode plates include a positive electrode plate and a negative electrode plate. The first layer is disposed between the positive electrode plate and the negative electrode plate. The negative electrode plate is located at the outermost layer of the electrode plates. The negative electrode plate includes a first side extending in a first direction and a second side extending in a second direction. The first direction is perpendicular to the second direction. The first side is connected to the second side through a third side. The first side and the third side intersect to form a first intersection point. The housing includes a first metal layer and a second layer containing a polymer material that are stacked. The second layer is disposed closer to the electrode assembly than the first metal layer. The housing further includes a first wall, a second wall, and a third wall that are interconnected. The first wall and the second wall are connected through a first arc wall. The first wall and the third wall are connected through a second arc wall. The second wall and the third wall are connected through a third arc wall. The arc radius of the first arc wall is R1, and the arc radius of the second arc wall is R2. The midpoint connection lines of each part of the first arc wall, the midpoint connection lines of each part of the second arc wall, and the midpoint connection lines of each part of the third arc wall intersect to form a second intersection point. The electrode assembly further includes a first surface and a second surface that are oppositely disposed in a third direction. The third direction is perpendicular to the first direction and the second direction. The projection of the second intersection point on the first surface or the second surface of the part of the electrode assembly where the first intersection point is provided on the negative electrode plate is a third intersection point. The distance L between the third intersection point and the first intersection point satisfies the relationship L≥0.8(R1 + R2).

[0005] In the present application, a third side is provided at the corner position of the end of the negative electrode tab to form a notch-like structure, so that the included angle at the end of the negative electrode tab is far from the corner position of the housing; and the projection (the third intersection point O') formed by the spherical center of the corner position of the housing on the first surface or the second surface of the electrode assembly where the end of the negative electrode tab is located and the first intersection point A at the corner of the end of the negative electrode tab satisfy the relationship L≥0.8(R1+R2), which can reduce the risk of the negative electrode tab piercing the second layer of the housing, thereby reducing the risk of the first metal layer of the housing coming into contact with the negative electrode tab or the electrolyte, improving the corrosion situation, and increasing the service life of the housing.

[0006] According to some embodiments of the present application, both the connection between the third side and the first side and the connection between the third side and the second side are arc-transition connections.

[0007] According to some embodiments of the present application, the included angle at the connection between the third side and the first side is an obtuse angle or an acute angle, and the included angle at the connection between the third side and the second side is an obtuse angle or an acute angle.

[0008] According to some embodiments of the present application, one of the connection between the third side and the first side and the connection between the third side and the second side is an arc-transition connection, and the included angle of the other is an obtuse angle or an acute angle.

[0009] According to some embodiments of the present application, the third side includes at least one of a curve and a straight line.

[0010] According to some embodiments of the present application, after the negative electrode tab, the first layer, and the positive electrode tab are stacked and wound to form an electrode assembly, the electrode assembly further includes a first flat portion and a second flat portion oppositely arranged in the third direction and a first bending portion and a second bending portion oppositely arranged in the first direction and connected between the first flat portion and the second flat portion.

[0011] According to some embodiments of the present application, the end of the negative electrode tab is located in the first bending portion, so that the included angle at the corner position of the end of the negative electrode tab can be far from the corner position of the housing, thereby reducing the risk of the negative electrode tab piercing the second layer of the housing.

[0012] According to some embodiments of the present application, the end of the positive electrode tab is located in the first bending portion.

[0013] According to some embodiments of the present application, the end of the first layer is located in the first bending portion.

[0014] According to some embodiments of the present application, the first intersection point is located in the first flat portion.

[0015] According to some embodiments of the present application, the first layer is located at the outermost layer of the electrode assembly. The electrode assembly further includes a third layer containing an insulating material. The third layer is connected to the first layer and is located at the first bending portion. By providing the third layer, the electrode assembly can be firmly connected to the housing.

[0016] According to some embodiments of the present application, the surface of the first layer is covered with a coating. By providing the coating, the safety performance and mechanical performance of the first layer can be improved, which helps to improve corrosion.

[0017] According to some embodiments of the present application, the negative electrode tab includes a second metal layer, a first conductive material layer, and a second conductive material layer. The second metal layer includes a first surface and a second surface that are oppositely arranged. The negative electrode tab further includes a starting end and an ending end that are oppositely arranged in the winding direction of the electrode assembly. The first conductive material layer is continuously provided on the first surface from the starting end to the ending end of the negative electrode tab, and the second conductive material layer is continuously provided on the second surface from the starting end to the ending end of the negative electrode tab.

[0018] According to some embodiments of the present application, the negative electrode tab further includes a plurality of negative electrode tabs extending from one side of the second metal layer.

[0019] According to some embodiments of the present application, the negative electrode tab further includes a first jumper. The plurality of negative electrode tabs are bent in the housing to form a first tab group. The first tab group is connected to the first jumper, and one end of the first jumper away from the first tab group extends out of the housing.

[0020] According to some embodiments of the present application, the positive electrode tab includes a third metal layer, a third conductive material layer, and a fourth conductive material layer. The third metal layer includes a third surface and a fourth surface that are oppositely arranged. The positive electrode tab further includes a starting end and an ending end that are oppositely arranged in the winding direction of the electrode assembly. The third conductive material layer is continuously provided on the third surface from the starting end to the ending end of the positive electrode tab, and the fourth conductive material layer is continuously provided on the fourth surface from the starting end to the ending end of the positive electrode tab.

[0021] According to some embodiments of the present application, the positive electrode tab includes a plurality of positive electrode tabs extending from one side of the third metal layer.

[0022] According to some embodiments of the present application, the positive electrode tab further includes a second jumper. The plurality of positive electrode tabs are bent in the housing to form a second tab group. The second tab group is connected to the second jumper, and one end of the second jumper away from the second tab group extends out of the housing.

[0023] According to some embodiments of the present application, the thickness range of the housing is 80 μm to 150 μm.

[0024] According to some embodiments of the present application, the first metal layer comprises aluminum, and the polymer material includes polyethylene, polypropylene, ethylene-propylene copolymer, polyethylene modified material or polypropylene modified material.

[0025] According to some embodiments of the present application, the second metal layer comprises copper.

[0026] The second aspect of the present application further provides an electronic device including the above battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0028] Figure 1 is a schematic diagram of a battery provided by an embodiment of the present application;

[0029] Figure 2 is Figure 1 a partial cross-sectional view of the housing of the battery shown along II-II;

[0030] Figure 3 is Figure 1 a cross-sectional view of the electrode assembly of the battery shown along III-III;

[0031] Figure 4 is Figure 1 a partial top view of part A-A of the battery shown;

[0032] Figure 5A is Figure 3 a top view of the negative electrode tab of the electrode assembly shown;

[0033] Figure 5B is Figure 3 a cross-sectional view of the negative electrode tab of the electrode assembly shown;

[0034] Figure 6 is Figure 1 a cross-sectional view of the battery shown along IV-IV;

[0035] Figure 7A is Figure 3 a top view of the positive electrode tab of the electrode assembly shown;

[0036] Figure 7B is Figure 3 a cross-sectional view of the positive electrode tab of the electrode assembly shown;

[0037] Figure 8 is Figure 1 a cross-sectional view of the battery shown along VIII-VIII;

[0038] Figure 9ASchematic cross-sectional view of the electrode assembly provided in another embodiment of the present application. The cutting direction of this cross-sectional view is the same as that of Figure 1 III-III in

[0039] Figure 9B Top view of the negative electrode tab of the electrode assembly provided in another embodiment of the present application;

[0040] Figure 9C Top view of the negative electrode tab of the electrode assembly provided in yet another embodiment of the present application;

[0041] Figure 9D Top view of the negative electrode tab of the electrode assembly provided in yet another embodiment of the present application;

[0042] Figure 10 Partial top view of the battery provided in another embodiment of the present application. The position of the part shown in this partial top view in the battery represented by Figure 10 is the same as the position of the A-A part in Figure 1 ;

[0043] Figure 11 Partial top view of the battery provided in yet another embodiment of the present application. The position of the part shown in this partial top view in the battery represented by Figure 11 is the same as the position of the A-A part in Figure 1 ;

[0044] Figure 12A Partial top view of the battery provided in yet another embodiment of the present application. The position of the part shown in this partial top view in the battery represented by Figure 12A is the same as the position of the A-A part in Figure 1 ;

[0045] Figure 12B Partial top view of the battery provided in yet another embodiment of the present application. The position of the part shown in this partial top view in the battery represented by Figure 12B is the same as the position of the A-A part in Figure 1 ;

[0046] Figure 12C Top view of the positive electrode tab of the electrode assembly provided in another embodiment of the present application;

[0047] Figure 13 Schematic diagram of the electronic device provided in an embodiment of the present application;

[0048] Figure 14 Partial top view of the battery provided in Comparative Example 1 of the present application. The position of the part shown in this partial top view in the battery represented by Figure 14 is the same as the position of the A-A part in Figure 1The position of the A-A section in it is the same.

[0049] Description of Main Component Symbols

[0050] Battery 100

[0051] Electrode assembly 10

[0052] Housing 20

[0053] Second layer 21

[0054] First metal layer 22

[0055] Fourth layer 23

[0056] First layer 11

[0057] Positive electrode tab 12

[0058] Negative electrode tab 13

[0059] First surface 105

[0060] Second surface 106

[0061] First bending portion 102

[0062] Second bending portion 104

[0063] First flat portion 101

[0064] Second flat portion 103

[0065] Starting ends 11a, 12a, 13a

[0066] Ending ends 11b, 12b, 13b

[0067] First side 13c

[0068] Second side 13d

[0069] Third side 13e

[0070] Fourth side 13f

[0071] Fifth side 13g

[0072] First wall 201

[0073] Second wall 202

[0074] Third wall 203

[0075] First arc wall 211

[0076] Second arc wall 212

[0077] Third arc wall 213

[0078] Second metal layer 131

[0079] First conductive material layer 132

[0080] Second conductive material layer 133

[0081] First side 131a

[0082] Second side 131b

[0083] Third metal layer 121

[0084] Third conductive material layer 122

[0085] Fourth conductive material layer 123

[0086] Third side 121a

[0087] Fourth side 121b

[0088] Third layer 30

[0089] Coating 40

[0090] Negative terminal tab 134

[0091] First jumper 136

[0092] First tab group 135

[0093] Positive terminal tab 124

[0094] Second jumper 126

[0095] Second tab group 125

[0096] Electronic device 200

[0097] Body 220

[0098] First demarcation line 11A

[0099] Second demarcation line 11B

[0100] Third demarcation line 11C

[0101] Fourth demarcation line 11D

[0102] Sixth side 12c

[0103] Seventh side 12d

[0104] Eighth side 12e

[0105] Ninth side 12f

[0106] Tenth side 12g

[0107] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific Embodiments

[0108] The technical solutions in the embodiments of the present application will be clearly and detailedly described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application.

[0109] Hereinafter, the embodiments of the present application will be described in detail. However, the present application can be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that the present application will be thorough and detailed and will convey to those skilled in the art.

[0110] In addition, for the sake of simplicity and clarity, in the drawings, the dimensions or thicknesses of various components and layers may be enlarged. Throughout the text, the same numerals refer to the same elements. As used herein, the terms "and / or", "as well as / or" include any and all combinations of one or more of the associated listed items. In addition, it should be understood that when element A is referred to as being "connected" to element B, element A may be directly connected to element B, or there may be an intermediate element C and elements A and B may be indirectly connected to each other.

[0111] Furthermore, when describing the embodiments of the present application, the use of "may" refers to "one or more embodiments of the present application".

[0112] The professional terms used herein are for the purpose of describing specific embodiments and are not intended to limit the present application. As used herein, the singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. It should be further understood that the term "comprises", when used in this specification, refers to the presence of the recited features, values, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, values, steps, operations, elements, components, and / or combinations thereof.

[0113] Spatial-related terms, such as "upper", etc., may be used in this document for convenience of description to describe the relationship between an element or feature and another element(s) or feature(s) as illustrated in the figures. It should be understood that, in addition to the directions described in the figures, spatial-related terms are intended to include different directions during the use or operation of the device or apparatus. For example, if the device in the figure is flipped, an element described as "above" or "on" another element or feature will be oriented "below" or "beneath" the other element or feature. Thus, the exemplary term "upper" can include both upward and downward directions. It should be understood that although terms such as first, second, third, etc. may be used in this document to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Thus, the first element, component, region, layer, or part discussed below may be referred to as the second element, component, region, layer, or part without departing from the teachings of the exemplary embodiments.

[0114] Please refer to 1 and Figure 2 , an embodiment of the present application provides a battery 100, including an electrode assembly 10, an electrolyte (not shown in the figure), and a housing 20 for housing the electrode assembly 10 and the electrolyte. The first connection tab 136 and the second connection tab 126 of the electrode assembly 10 extend from one end of the housing 20 to connect to external components. The housing 20 may include a second layer 21, a first metal layer 22, and a fourth layer 23 that are sequentially stacked. The second layer 21 is disposed closer to the electrode assembly 10 than the first metal layer 22. The fourth layer 23 is located on the outermost side of the housing 20 and is exposed to the external environment.

[0115] The material of the second layer 21 may be any material suitable for contacting and accommodating the electrode assembly 10 in the art. In some embodiments, the second layer 21 includes a polymer material, and the polymer material may be polyethylene, polypropylene, ethylene-propylene copolymer, polyethylene modified material, or polypropylene modified material. The first metal layer 22 includes aluminum. The material of the first metal layer 22 may be a material containing aluminum such as aluminum with appropriate strength. The material of the fourth layer 23 may be any suitable material for contacting the external environment, such as, but not limited to, nylon.

[0116] Please refer to Figure 3, the electrode assembly 10 includes electrode tabs and a first layer 11. The electrode tabs include a positive electrode tab 12 and a negative electrode tab 13, and the first layer 11 is disposed between the positive electrode tab 12 and the negative electrode tab 13. The positive electrode tab 12, the first layer 11, and the negative electrode tab 13 are stacked along a third direction Z and then wound around a second direction Y to form the electrode assembly 10, and the winding center of the electrode assembly 10 is M. In this application, the third direction Z refers to a direction perpendicular to a surface of the first connecting tab 136 or the second connecting tab 126, and is also the stacking direction of the positive electrode tab 12, the first layer 11, and the negative electrode tab 13; the second direction Y refers to the direction in which the first connecting tab 136 or the second connecting tab 126 extends out of the housing, and the second direction Y is perpendicular to the third direction Z. When observing along the third direction Z, the electrode tabs include multiple layers of negative electrode tabs 13 and multiple layers of positive electrode tabs 12 that are alternately stacked, wherein the outermost layer of the electrode tabs is a layer of negative electrode tab 13, and the outer surface of the electrode tabs is the surface of a layer of negative electrode tab 13. In some embodiments, when observing along the third direction Z, the first layer 11 is located at the outermost layer of the electrode assembly 10 to isolate the negative electrode tab 13 located at the outermost layer of the electrode tabs from the housing 20, reduce the risk of contact between the negative electrode tab 13 and the housing 20, and can protect the negative electrode tab 13 located at the outermost layer of the electrode tabs from being exposed to the electrolyte, so as to reduce the risk of the electrolyte corroding the negative electrode tab 13. In some embodiments, when observing along the third direction Z, the positive electrode tab 12 may be located at the outermost layer of the electrode assembly 10. Along the second direction Y, the edge of the negative electrode tab 13 extends beyond the edge of the positive electrode tab to reduce the risk of lithium deposition.

[0117] The electrode assembly 10 includes a plurality of first planar portions 101 and a plurality of second planar portions 103 located on opposite sides of the winding center M in the third direction Z, and a plurality of first bending portions 102 and a plurality of second bending portions 104 located on opposite sides of the winding center M in the first direction X. The first planar portions 101 and the second planar portions 103 are both connected to the first bending portions 102 and the second bending portions 104. In this application, the first direction X is perpendicular to the second direction Y and the third direction Z. Figure 3Among them, multiple first planar portions 101 and multiple second planar portions 103 are distributed on the upper and lower sides of the winding center M, and multiple first bending portions 102 and multiple second bending portions 104 are distributed on the left and right sides of the winding center M. The electrode assembly 10 further includes a first surface 105 and a second surface 106 oppositely arranged in the third direction Z. The first surface 105 is composed of the surface of the outermost first planar portion 101 located on the upper side of the winding center M, the surface of the outermost first bending portion 102 located on the upper side of the winding center M, and the surface of the outermost second bending portion 104 located on the upper side of the winding center M. The second surface 106 is composed of the surface of the outermost first planar portion 101 located on the lower side of the winding center M, the surface of the outermost first bending portion 102 located on the lower side of the winding center M, and the surface of the outermost second bending portion 104 located on the lower side of the winding center M. The first demarcation line 11A between the outermost first planar portion 101 and the first bending portion 102 of the electrode assembly 10 is the part where the dotted line AA formed by the bent edge located at the innermost side of the electrode assembly 10 and on one side of the winding center M in the first direction X ( Figure 3 the left side in) extends in the third direction Z and intersects with the first surface 105. The second demarcation line 11B between the outermost second planar portion 103 and the first bending portion 102 of the electrode assembly 10 is the part where the dotted line AA formed by the bent edge located at the innermost side of the electrode assembly 10 and on one side of the winding center M in the first direction X ( Figure 3 the left side in) extends in the third direction Z and intersects with the second surface 106. The third demarcation line 11C between the outermost first planar portion 101 and the second bending portion 104 of the electrode assembly 10 is the part where the dotted line BB formed by the bent edge located at the innermost side of the electrode assembly 10 and on one side of the winding center M in the first direction X ( Figure 3 the right side in) extends in the third direction Z and intersects with the first surface 105. The fourth demarcation line 11D between the outermost second planar portion 103 and the second bending portion 104 of the electrode assembly 10 is the part where the dotted line BB formed by the bent edge located at the innermost side of the electrode assembly 10 and on one side of the winding center M in the first direction X ( Figure 3 the right side in) extends in the third direction Z and intersects with the second surface 106. The first demarcation line 11A between the outermost first planar portion 101 and the first bending portion 102 of the electrode assembly 10, the second demarcation line 11B between the outermost second planar portion 103 and the first bending portion 102 of the electrode assembly 10, the third demarcation line 11C between the outermost first planar portion 101 and the second bending portion 104 of the electrode assembly 10, and the fourth demarcation line 11D between the outermost second planar portion 103 and the second bending portion 104 of the electrode assembly 10 are respectively located at the four corner positions of the electrode assembly 10. Figure 3A corner position B-B of the electrode assembly 10 is shown. Please refer to Figure 1 and Figure 3 , the corner position B-B of the electrode assembly 10 is opposite to the corner position A-A of the housing 20.

[0118] In the winding direction W of the electrode assembly 10, the first layer 11 includes a relatively arranged starting end 11a and an ending end 11b, the positive electrode tab 12 includes a relatively arranged starting end 12a and an ending end 12b, and the negative electrode tab 13 includes a relatively arranged starting end 13a and an ending end 13b. In this application, the winding direction W refers to the direction of winding around the second direction Y, the starting end refers to one end of the first layer 11, the positive electrode tab 12 or the negative electrode tab 13 located at the winding start position in the winding direction W, and the ending end refers to one end of the first layer 11, the positive electrode tab 12 or the negative electrode tab 13 located at the winding end position in the winding direction W. In this embodiment, the ending end 11b of the first layer 11 and the ending end 13b of the negative electrode tab 13 are located at the first bending portion 102, and the ending end 12b of the positive electrode tab 12 is located at the first flat portion 101. By arranging the ending end 13b of the negative electrode tab 13 at the first bending portion 102, the corner of the ending end 13b of the negative electrode tab 13 can be separated from the corner position A-A of the housing 20, which can reduce the risk of the corner of the ending end 13b of the negative electrode tab 13 piercing the second layer of the housing, thereby reducing the risk of contact between the first metal layer 22 of the housing 20 and the electrolyte or the negative electrode tab 13, reducing the risk of reaction corrosion between the first metal layer 22 and the electrolyte, or reducing the risk of corrosion due to different potentials after the first metal layer 22 contacts the negative electrode tab 13 under the infiltration of the electrolyte, and further improving the service life of the housing 20.

[0119] Please refer to Figure 4 , Figure 4 , in which the first layer is omitted, and the negative electrode tab 13 is located at the outermost layer of the electrode assembly 10. The negative electrode tab 13 includes a first side 13c extending along the first direction X and a second side 13d extending along the second direction Y. The first side 13c and the second side 13d are connected by a third side 13e, and the first side 13c intersects the third side 13e to form a first intersection point A. Among them, the second side 13d is simultaneously the ending end 13b of the negative electrode tab 13, and the third side 13e is located at the corner position of the ending end 13b of the negative electrode tab 13. The included angle α between the connection of the third side 13e and the first side 13c and the included angle β between the connection of the third side 13e and the second side 13d are both acute angles. In this embodiment, the third side 13e is a concave curve.

[0120] Please refer to Figure 1 and Figure 4, the housing 20 further includes a first wall 201, a second wall 202, and a third wall 203 that are connected to each other. The first wall 201 is perpendicular to the third direction Z, the second wall 202 is perpendicular to the second direction Y, and the third wall 203 is perpendicular to the first direction X. The first wall 201 and the second wall 202 are connected by a first arc wall 211, the first wall 201 and the third wall 203 are connected by a second arc wall 212, and the second wall 202 and the third wall 203 are connected by a third arc wall 213. The arc radius of the first arc wall 211 is R1, and the arc radius of the second arc wall 212 is R2. The midpoint connection line L1 of each arc side on the first arc wall 211, the midpoint connection line L2 of each arc side on the second arc wall 212, and the midpoint connection line L3 of each arc side on the third arc wall 213 intersect at a second intersection point O. The second intersection point O is the spherical center of the angular position A-A of the housing 20, and it is located at a thinner position on the first metal layer 22 in the housing 20. The projection of the second intersection point O on the first surface 105 or the second surface 106 of the electrode assembly 10 where the part of the negative electrode tab 13 having the first intersection point A is located is a third intersection point O'. In some embodiments of the present invention, the part of the negative electrode tab 13 having the first intersection point A refers to the part of the negative electrode tab 13 from its end 13b to the first intersection point A, and it can be located on the first surface 105 and / or the second surface 106. In some embodiments, the third intersection point O' refers to the projection of the second intersection point O on the surface of the first surface 105 and the second surface 106 that is closer to the first intersection point A. The distance L between the third intersection point O' and the first intersection point A satisfies the relationship L≥0.8(R1 + R2).

[0121] The extension lines of the first side 13c and the second side 13d intersect to form a virtual intersection point A', and the virtual intersection point A' is opposite to the angular position of the housing 20. By providing the third side 13e, the connection part of the third side 13e with the first side 13c and the second side 13d can be made away from the angular position of the housing 20; and by making the distance L between the third intersection point O' and the first intersection point A satisfy the relationship L≥0.8(R1 + R2), the risk of the negative electrode tab 13 piercing the second layer 21 of the housing 20 can be reduced, thereby reducing the risk of the first metal layer 22 of the housing 20 coming into contact with the electrolyte or the negative electrode tab 13, reducing the risk of the first metal layer 22 reacting with the electrolyte to corrode, or reducing the risk of the first metal layer 22 corroding due to different potentials after contacting the negative electrode tab 13 under the infiltration of the electrolyte, and further improving the service life of the housing 20. In addition, by providing the third side 13e, a notch-like structure is formed at the corner position of the negative electrode tab 13, and this notch-like structure can be used as a cutting mark during the process of producing the negative electrode tab using the negative electrode tab coil stock, reducing the risk of product defects (such as ear misalignment) caused by incorrect cutting positions.

[0122] Please refer to Figure 3, the negative electrode plate 13 includes a second metal layer 131, a first conductive material layer 132, and a second conductive material layer 133. The second metal layer 131 includes a first surface 131a and a second surface 131b that are oppositely arranged. Along the winding direction W, the first conductive material layer 132 is continuously provided on the first surface 131a, and the second conductive material layer 133 is continuously provided on the second surface 131b. During manufacturing, the conductive material can be continuously coated on the first surface 131a and the second surface 131b of the second metal layer 131, improving the manufacturing efficiency. Both the first conductive material layer 132 and the second conductive material layer 133 have the function of an active layer, and they can be selected from at least one of graphite materials, alloy materials, lithium metal, and its alloys. The graphite materials can be selected from at least one of artificial graphite and natural graphite; the alloy materials can be selected from at least one of silicon, silicon oxide, tin, and titanium sulfide. The second metal layer 131 has a current collecting function, and it can include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and their combinations. In this embodiment, the second metal layer 131 includes copper.

[0123] The positive electrode plate 12 includes a third metal layer 121, a third conductive material layer 122, and a fourth conductive material layer 123. The third metal layer 121 includes a third surface 121a and a fourth surface 121b that are oppositely arranged. Along the winding direction W, the third conductive material layer 122 is continuously provided on the third surface 121a, and the fourth conductive material layer 123 is continuously provided on the fourth surface 121b. During manufacturing, the conductive material is continuously coated on, and the conductive material can be continuously coated on the third surface 121a and the fourth surface 121b of the third metal layer 121, improving the manufacturing efficiency. Both the third conductive material layer 122 and the fourth conductive material layer 123 have the function of an active layer, and they can include at least one of lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadium oxyphosphate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate, and their combinations. The third metal layer 121 has a current collecting function, and it can include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and their combinations.

[0124] The first layer 11 is used to prevent the positive electrode plate 12 and the negative electrode plate 13 from directly contacting, thereby reducing the risk of contact short circuit between the first conductive layer 111 and the second conductive layer 112. The first layer 11 contains an insulating material. The insulating material can be selected from at least one of polypropylene, polyethylene, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polymethyl methacrylate, or polyethylene glycol. The first layer 11 can be a separator.

[0125] In some embodiments, the material of the first layer 11 is polyethylene, and the thickness range of the first layer 11 is from 14 μm to 25 μm. In other embodiments, the material of the first layer 11 is polypropylene, and the thickness range of the first layer 11 is from 5 μm to 12 μm. The thicker the first layer 11 is, the more helpful it is to improve corrosion, and the influence of the distance L between the third intersection point O' and the first intersection point A on corrosion will become weaker.

[0126] In some embodiments, the electrode assembly 10 further includes a third layer 30. The third layer 30 is connected to the first layer 11 and is located at the first bending portion 102. The third layer 30 is used to connect the first layer 11 and the second layer of the housing to fix the electrode assembly 10 to the housing. The third layer 30 includes an insulating material, and the insulating material may include at least one of acrylate, polyurethane, rubber, and silica gel. In other embodiments, the third layer 30 may be located at the first planar portion 101 or the second bending portion 104.

[0127] In some embodiments, the surface of the first layer 11 is covered with a coating 40. The coating 40 can be an inorganic coating or an organic coating. The inorganic coating includes inorganic particles and a binder. The inorganic particles can be at least one of aluminum oxide, silicon dioxide, titanium dioxide, zirconium dioxide, cerium dioxide, calcium oxide, calcium carbonate, and barium titanate; the binder can be at least one of styrene-butadiene polymer, polyvinylidene fluoride, polyvinylpyrrolidone, vinylidene fluoride-hexafluoropropylene polymer, polyacrylonitrile, sodium carboxymethyl cellulose, butadiene-acrylonitrile polymer, polyacrylic acid, methyl polyacrylate, ethyl polyacrylate, and polyacrylic acid-styrene polymer. The organic coating can be at least one of polyvinylidene fluoride, polyvinylpyrrolidone, vinylidene fluoride-hexafluoropropylene polymer, polyacrylonitrile, sodium carboxymethyl cellulose, sodium polyacrylate, butadiene-acrylonitrile polymer, ethyl acetate, polyacrylic acid, methyl polyacrylate, ethyl polyacrylate, and polyacrylic acid-styrene polymer. By providing the coating 40, the safety performance and mechanical performance of the first layer 11 can be improved, which helps to improve corrosion.

[0128] In some embodiments, the number of layers of the coating 40 on the surface of the first layer 11 is one or two. When the number of layers of the coating 40 is large, the influence of the distance L between the third intersection point O' and the first intersection point A on corrosion becomes weaker.

[0129] In some embodiments, the thickness range of the housing is from 80 μm to 150 μm. The thicker the housing is, the more helpful it is to improve corrosion, and the influence of the distance L between the third intersection point O' and the first intersection point A on corrosion will become weaker.

[0130] Please refer to Figure 5A and Figure 5B, the negative electrode tab 13 further includes a fourth side 13f and a fifth side 13g. The fourth side 13f is parallel to the first side 13c, and the fifth side 13g is parallel to the second side 13d. The fifth side 13g is perpendicularly connected to both the first side 13c and the fourth side 13f, and the second side 13d is perpendicularly connected to the fourth side 13f. The fifth side 13g serves as the starting end 13a of the negative electrode tab 13. In other embodiments, the first side 13c may be perpendicularly connected to the second side 13d, and the second side 13d may be connected to the fourth side 13f through the third side 13e. The first conductive material layer 132 is disposed on the first surface 131a of the second metal layer 131 and is continuously disposed from the starting end 13a to the ending end 13b in the fourth direction X'. The second conductive material layer 133 is disposed on the second surface 131b of the second metal layer 131 and is continuously disposed from the starting end 13a to the ending end 13b in the fourth direction X'. In this application, the fourth direction X' is perpendicular to the second direction Y and the third direction Z, and it is the extending direction of the negative electrode tab 13 before winding.

[0131] Please refer to Figure 5A , Figure 5B and Figure 6 , the negative electrode tab 13 further includes a plurality of negative electrode tabs 134 and a first adapter piece 136. The plurality of negative electrode tabs 134 extend from one side of the second metal layer 131 and protrude from the first side 13c of the negative electrode tab 13. In the fourth direction X', the plurality of negative electrode tabs 134 are spaced apart. The plurality of negative electrode tabs 134 are bent inside the housing 20 to form a first tab group 135. In this embodiment, the plurality of negative electrode tabs 134 are formed by cutting the edge of the second metal layer 131. The first tab group 135 is connected to the first adapter piece 136. The first tab group 135 can be, but is not limited to, connected to the first adapter piece 136 by welding. One end of the first adapter piece 136 away from the first tab group 135 extends out of the housing 20 to connect to an external component. The first adapter piece 136 may include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and their combinations.

[0132] Please refer to Figure 7A and Figure 7B, the positive electrode tab 12 includes a sixth side 12c and a seventh side 12d that extend in the fourth direction X' and are parallel to each other, and an eighth side 12e and a ninth side 12f that extend in the second direction Y and are parallel to each other. The eighth side 12e serves as the end 12b of the positive electrode tab 12, and the ninth side 12f serves as the start 12a of the positive electrode tab 12. The sixth side 12c is perpendicularly connected to both the eighth side 12e and the ninth side 12f, and the seventh side 12d is perpendicularly connected to both the eighth side 12e and the ninth side 12f. The third conductive material layer 122 is disposed on the third surface 121a of the third metal layer 121 and is continuously disposed from the start 12a to the end 12b in the fourth direction X'. The fourth conductive material layer 123 is disposed on the fourth surface 121b of the third metal layer 121 and is continuously disposed from the start 12a to the end 12b in the fourth direction X'.

[0133] Please refer to Figure 7A , Figure 7B and Figure 8 , the positive electrode tab 12 further includes a plurality of positive electrode tabs 124 and a second connection tab 126. The plurality of positive electrode tabs 124 extend from one side of the third metal layer 121 and protrude from the sixth side 12c. In the fourth direction X', the plurality of positive electrode tabs 124 are spaced apart. The plurality of positive electrode tabs 124 are bent inside the housing to form a second tab group 125. In this embodiment, the plurality of positive electrode tabs 124 are formed by cutting the edge of the third metal layer 121. The second tab group 125 is connected to the second connection tab 126. The second connection tab 126 can be connected to the second connection tab 126 by, but not limited to, welding. One end of the second connection tab 126 away from the second tab group 125 extends out of the housing 20 to connect to an external component. The second connection tab 126 may include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and their combinations.

[0134] Please refer to Figure 9A , in some embodiments, the end 11b of the first layer 11, the end 13b of the negative electrode tab 13, and the end 12b of the positive electrode tab 12 are all located at the first bending portion 102. In other embodiments, the end 11b of the first layer 11, the end 13b of the negative electrode tab 13, and the end 12b of the positive electrode tab 12 may be respectively located at the first bending portion 102 and the second bending portion 104, or all located at the second bending portion 104.

[0135] Please refer to Figure 9B, in some embodiments, the negative electrode tab 13 includes two third sides 13e. One of the third sides 13e connects the first side 13c and the second side 13d, and the other third side 13e connects the second side 13d and the fourth side 13f. By providing two third sides 13e, notch-like structures are formed at both corner positions of the end 13b of the negative electrode tab 13.

[0136] Please refer to Figure 9C , in some embodiments, the negative electrode tab 13 includes three third sides 13e. One of the third sides 13e connects the first side 13c and the second side 13d, one third side 13e connects the second side 13d and the fourth side 13f, and the other third side 13e connects the first side 13c and the fifth side 13g. By providing three third sides 13e, notch-like structures are formed at both corner positions of the end 13b of the negative electrode tab 13 and at one corner position of the start end 13a of the negative electrode tab 13.

[0137] Please refer to Figure 9D , in some embodiments, the negative electrode tab 13 includes four third sides 13e. One of the third sides 13e connects the first side 13c and the second side 13d, one third side 13e connects the second side 13d and the fourth side 13f, one third side 13e connects the first side 13c and the fifth side 13g, and the other third side 13e connects the fifth side 13g and the fourth side 13f. By providing four third sides 13e, notch-like structures are formed at both corner positions of the end 13b of the negative electrode tab 13 and at both corner positions of the start end 13a of the negative electrode tab 13.

[0138] Please refer to Figure 10 , in some embodiments, the third side 13e is a curve composed of a concave curve and a convex curve. The connection between the third side 13e and the first side 13c is an arc transition, and the included angle β at the connection between the third side 13e and the second side 13d is an acute angle. The two third sides 13e respectively form two included angles (acute angles) between the first side 13c and the second side 13d, and between the fourth side 13f and the second side 13d. In other embodiments, the connection between the third side 13e and the second side 13d may be an arc transition, and the included angle α at the connection between the third side 13e and the first side 13c may be an acute angle.

[0139] Please refer to Figure 11, in some embodiments, the third side 13e is a straight line. The included angle α at the connection between the third side 13e and the first side 13c is an obtuse angle, and the included angle β at the connection between the third side 13e and the second side 13d is an acute angle. Two of the four included angles formed by the two third sides 13e between the first side 13c and the second side 13d and between the fourth side 13f and the second side 13d are obtuse angles and two are acute angles. In some embodiments, the range of the obtuse angle is greater than 90° and less than or equal to 150°. In other embodiments, the third side 13e can be a line segment formed by a straight line and a straight line or a straight line and a curve. The included angle α at the connection between the third side 13e and the first side 13c can be an acute angle, and the included angle β at the connection between the third side 13e and the second side 13d can be an obtuse angle.

[0140] Please refer to Figure 12A , in some embodiments, the third side 13e is an arc line, and the connections between the third side 13e and the first side 13c and between the third side 13e and the second side 13d are both arc transitions. When there are arc transitions between the third side 13e and the first side 13c and the second side 13d, even if the distance L between the third intersection point O' and the first intersection point A does not satisfy the relationship L≥0.8(R1 + R2), the corrosion situation can be improved.

[0141] Please refer to Figure 12B , in some embodiments, the first intersection point A formed by the intersection of the first side 13c and the third side 13e is located on the first planar portion 101. Specifically, the end 13b of the negative electrode tab 13 is located on the first bending portion 102, and the third side 13e extends from the first bending portion 102 to the first planar portion 101. In other embodiments, the end 13b of the negative electrode tab 13 and the first intersection point A can both be located on the first planar portion 101.

[0142] Please refer to Figure 12C , in some embodiments, the positive electrode tab 12 further includes a tenth side 12g. The sixth side 12c is connected to the seventh side 12d through the tenth side 12g. The tenth side 12g includes at least one of a straight line and a curve. By providing the tenth side 12g to form a notch-like structure at the corner position of the positive electrode tab 12, this notch-like structure can be used as a cutting mark during the production of the positive electrode tab. In other embodiments, the positive electrode tab 12 can include multiple tenth sides 12g, and the sixth side 12c and the seventh side 12d can be connected to the eighth side 12e and the ninth side 12f through the tenth side 12g respectively, so as to form notch-like structures at the respective corner positions of the positive electrode tab 12.

[0143] Please refer to Figure 13, Embodiments of the present application further provide an electronic device 200, which includes a main body 220 and a battery 100. The battery 100 is housed in the main body 220. The electronic device 200 can be one of a mobile phone, a tablet computer, and an e-reader.

[0144] In the present application, taking the mobile phone as an example for the electronic device 200, the battery 100 is arranged in the mobile phone to provide power for the mobile phone to use, and the main body 220 is the structure of the mobile phone. It can be understood that in other embodiments, the electronic device 200 can also have other structures, not limited to the above-mentioned mobile phone, tablet computer, and e-reader.

[0145] In the present application, a third side is provided at the corner position of the end of the negative electrode tab to form a notch-like structure, so that the angle (obtuse or acute angle) at the end of the negative electrode tab is away from the corner of the housing; and the spherical center of the corner of the housing forms a projection (the third intersection point O') on the first surface or the second surface of the electrode assembly where the end of the negative electrode tab is located, and the first intersection point A at the corner of the end of the negative electrode tab satisfies the relationship L≥0.8(R1 + R2), which can reduce the risk of the negative electrode tab piercing the second layer of the housing, thereby reducing the risk of contact between the first metal layer of the housing and the negative electrode tab or the electrolyte, improving the corrosion situation, and increasing the service life of the housing. In addition, the notch-like structure formed at the corner position of the end of the negative electrode tab can be used as a cutting mark, which helps to identify and position during the cutting process, so as to facilitate the division of the negative electrode tab roll into multiple negative electrode tabs for finished batteries during production and manufacturing.

[0146] The performance of the battery provided by the present application is described below through specific examples and comparative examples.

[0147] Example 1

[0148] The electrode assembly is loaded into the housing, and after liquid injection, encapsulation, and formation, the finished battery as shown in Figure 10 is obtained. Among them, the distance L between the third intersection point O' and the first intersection point A satisfies the relationship L = 0.8(R1 + R2).

[0149] Example 2

[0150] The electrode assembly is loaded into the housing, and after liquid injection, encapsulation, and formation, the finished battery as shown in Figure 10 is obtained. Among them, the distance L between the third intersection point O' and the first intersection point A satisfies the relationship L = 1.0(R1 + R2).

[0151] Example 3

[0152] The electrode assembly is loaded into the housing, and after liquid injection, encapsulation, and formation, the finished battery as shown in Figure 11The finished battery shown. Among them, the distance L between the third intersection point O' and the first intersection point A satisfies the relational expression L = 1.0(R1 + R2).

[0153] Comparative Example 1

[0154] The electrode assembly is loaded into the housing, and after liquid injection, encapsulation, and formation, the finished battery as shown in Figure 14 is obtained. Figure 14 The difference between the battery 100 shown and Figure 4 the battery 100 shown is that the first side 13c directly intersects with the second side 13d to form the first intersection point A. The first side 13c and the fourth side are respectively perpendicularly connected to the second side 13d, that is, two right angles are formed at the two corner positions of the second side 13d. The distance L between the third intersection point O' and the first intersection point A satisfies the relational expression L = 0.4(R1 + R2).

[0155] Comparative Example 2

[0156] The electrode assembly is loaded into the housing, and after liquid injection, encapsulation, and formation, the finished battery as shown in Figure 10 is obtained. Among them, the distance L between the third intersection point O' and the first intersection point A satisfies the relational expression L = 0.6(R1 + R2).

[0157] Comparative Example 3

[0158] The electrode assembly is loaded into the housing, and after liquid injection, encapsulation, and formation, the finished battery as shown in Figure 11 is obtained. Among them, the distance L between the third intersection point O' and the first intersection point A satisfies the relational expression L = 0.6(R1 + R2).

[0159] 1000 samples of each group of batteries in the examples and comparative examples are taken for corrosion testing. The test results are shown in Table 1.

[0160] Corrosion test: Test the voltage difference between the first adapter plate and the first metal layer of the battery sample. When the voltage difference is greater than or equal to 0.6V, the probability of corrosion is relatively high, and it is determined that the corrosion test fails; when the voltage difference is less than 0.6V, it is determined that the corrosion test passes.

[0161] Table 1

[0162] Number of included angles Relationship formula Corrosion condition Example 1 2 <![CDATA[L = 0.8(R1 + R2)]]> 0 / 1000 Example 2 2 <![CDATA[L = 1.0(R1 + R2)]]> 0 / 1000 Example 3 4 <![CDATA[L = 1.0(R1 + R2)]]> 0 / 1000 Comparative example 1 2 <![CDATA[L = 0.4(R1 + R2)]]> 150 / 1000 Comparative example 2 2 <![CDATA[L = 0.6(R1 + R2)]]> 60 / 1000 Comparative example 3 4 <![CDATA[L = 0.6(R1 + R2)]]> 90 / 1000

[0163] Note: X / 1000 means that the number of samples that failed the corrosion test among the 1000 tested samples is X.

[0164] It can be seen from the test results in Table 1 that by comparing Examples 1-3 and Comparative Examples 1-3, by setting the third side and making the third intersection point O' and the first intersection point A satisfy the relational expression L ≥ 0.8(R1 + R2), the corrosion situation can be improved.

[0165] The above disclosure is only for the preferred embodiments of the present application. Of course, the present application cannot be limited thereby. Therefore, equivalent changes made in accordance with the present application still fall within the scope covered by the present application.

Claims

1. A battery, characterized in that, Comprising: An electrode assembly, including a pole piece and a first layer containing an insulating material. Wherein, the pole piece includes a positive pole piece and a negative pole piece, the first layer is disposed between the positive pole piece and the negative pole piece, the negative pole piece is located at the outermost layer of the pole piece, the negative pole piece includes a first side extending in a first direction and a second side extending in a second direction, the first direction is perpendicular to the second direction, the first side is connected to the second side through a third side, and the first side intersects with the third side to form a first intersection point; and A housing for housing the electrode assembly. Wherein, the housing includes a first metal layer and a second layer containing a polymer material which are stacked, and the second layer is disposed closer to the electrode assembly than the first metal layer; Wherein, the housing further includes a first wall, a second wall and a third wall which are interconnected. The first wall and the second wall are connected through a first arc wall, the first wall and the third wall are connected through a second arc wall, and the second wall and the third wall are connected through a third arc wall. The arc radius of the first arc wall is R1, the arc radius of the second arc wall is R2, and the midpoint connection lines of the first arc wall, the midpoint connection lines of the second arc wall and the midpoint connection lines of the third arc wall intersect to form a second intersection point. The electrode assembly further includes a first surface and a second surface which are oppositely disposed in a third direction, the third direction is perpendicular to the first direction and the second direction, and the projection of the second intersection point on the first surface or the second surface of the electrode assembly where the portion of the negative pole piece having the first intersection point is located is a third intersection point, and the distance L between the third intersection point and the first intersection point satisfies the relationship L≥0.8(R1+R2).

2. The battery according to claim 1, wherein, Both the connection between the third side and the first side and the connection between the third side and the second side are arc-shaped transition connections.

3. The battery according to claim 1, characterized in that, The included angle at the connection between the third side and the first side is an obtuse angle or an acute angle, and the included angle at the connection between the third side and the second side is an obtuse angle or an acute angle.

4. The battery according to claim 1, wherein, One of the connection between the third side and the first side and the connection between the third side and the second side is an arc-shaped transition connection, and the included angle of the other is an obtuse angle or an acute angle.

5. The battery according to claim 1, wherein The third side includes at least one of a curve and a straight line.

6. The battery according to claim 1, characterized in that, The negative pole piece, the first layer and the positive pole piece are stacked and wound to form the electrode assembly. The electrode assembly further includes a first flat portion and a second flat portion which are oppositely disposed in a third direction, and a first bending portion and a second bending portion which are connected between the first flat portion and the second flat portion and are oppositely disposed in the first direction.

7. The battery according to claim 6, wherein, In the winding direction, the second side is the end.

8. The battery according to claim 6, wherein The end of the negative pole piece is located at the first bending portion.

9. The battery according to claim 6, characterized in that, The end of the positive pole piece is located at the first bending portion.

10. The battery according to claim 6, wherein, The end of the first layer is located at the first bending portion.

11. The battery according to claim 6, characterized in that, The first intersection point is located at the first flat portion.

12. The battery according to claim 6, characterized in that, The first layer is located at the outermost layer of the electrode assembly. The electrode assembly further includes a third layer containing an insulating material, and the third layer is connected to the first layer and is located at the first bending portion.

13. The battery according to claim 11, characterized in that, The surface of the first layer is covered with a coating.

14. The battery according to claim 1, wherein The negative electrode plate includes a second metal layer, a first conductive material layer, and a second conductive material layer. The second metal layer includes a first surface and a second surface that are oppositely arranged. The negative electrode plate further includes a starting end and an ending end that are oppositely arranged in the winding direction of the electrode assembly. The first conductive material layer is continuously arranged on the first surface from the starting end to the ending end of the negative electrode plate, and the second conductive material layer is continuously arranged on the second surface from the starting end to the ending end of the negative electrode plate.

15. The battery according to claim 14, characterized in that, The negative electrode plate further includes a plurality of negative electrode tabs extending from one side of the second metal layer.

16. The battery according to claim 15, wherein The negative electrode plate further includes a first adapter piece. The plurality of negative electrode tabs are bent in the housing to form a first tab group, the first tab group is connected to the first adapter piece, and one end of the first adapter piece away from the first tab group extends out of the housing.

17. The battery according to claim 14, characterized in that, The second metal layer contains copper.

18. The battery according to claim 1, characterized in that, The positive electrode plate includes a third metal layer, a third conductive material layer, and a fourth conductive material layer. The third metal layer includes a third surface and a fourth surface that are oppositely arranged. The positive electrode plate further includes a starting end and an ending end that are oppositely arranged in the winding direction of the electrode assembly. The third conductive material layer is continuously arranged on the third surface from the starting end to the ending end of the positive electrode plate, and the fourth conductive material layer is continuously arranged on the fourth surface from the starting end to the ending end of the positive electrode plate.

19. The battery according to claim 18, characterized in that, The positive electrode plate includes a plurality of positive electrode tabs extending from one side of the third metal layer.

20. The battery according to claim 19, characterized in that, The positive electrode plate further includes a second adapter piece. The plurality of positive electrode tabs are bent in the housing to form a second tab group, the second tab group is connected to the second adapter piece, and one end of the second adapter piece away from the second tab group extends out of the housing.

21. The battery according to claim 1, characterized in that, The thickness range of the housing is from 80 μm to 150 μm.

22. The battery according to claim 1, wherein, The first metal layer contains aluminum, and the polymer material includes polyethylene, polypropylene, ethylene-propylene copolymer, polyethylene modified material, or polypropylene modified material.

23. An electronic device, characterized in that, A battery comprising the battery according to any one of claims 1 to 22.

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