Batteries and electronic devices

Abstract

The present application relates to the field of battery technology and discloses a battery (1) and an electronic device (2). The battery (1) includes a housing (100), an electrode assembly (200), a first layer (400) and a second layer (500). The electrode assembly includes a first electrode sheet, a second electrode sheet and a separator. The electrode assembly is wound up. Thus, the first electrode sheet has a first side and a second side facing each other along the winding direction and a first end end away from the first side, and when viewed along the first direction, the electrode assembly has a first surface, the second side divides the first surface into a first region and a second region, and the first region is the region where the first end end is located. The first layer is fixed to the first region and the second region, and the second layer is fixed to the first surface and has a gap between it and the first layer, and the second layer is used to adhesively fix the electrode assembly to the housing. The battery can reduce the risk of the electrode assembly slipping relative to the housing when the battery or an electronic device containing the battery is dropped.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and particularly to batteries and electronic devices.

Background Art

[0002] A battery is for converting external energy into electrical energy and storing it internally, and supplying power to external devices (such as portable electronic devices) as needed. Currently, batteries are widely used in electronic devices such as mobile phones, tablets, notebook computers, drones, and electric vehicles.

[0003] Generally, a battery includes a housing, an electrode assembly, a conductive plate, and an electrolyte. Here, the electrode assembly is housed in the housing, one end of the conductive plate is fixed to the electrode assembly, the other end of the conductive plate extends out of the housing to form an external terminal of the battery, and the electrolyte is filled in the housing.

[0004] An electronic device may accidentally fall or collide during use. This may make it easy for the electrode assembly to slide relative to the housing, and further cause impact damage to the conductive plate at the connection part with the electrode assembly and damage to the electrode assembly, which may reduce the service life of the battery.

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of this application is to provide a battery and an electronic device for reducing the risk that the electrode assembly slides relative to the housing when the battery or the electronic device with the battery falls or collides with other objects, and improving the service life of the battery.

Means for Solving the Problems

[0006] In a first aspect, this application adopts the following technical solutions to solve its technical problems.

[0007] It is a battery, It comprises a housing, an electrode assembly, a first layer, and a second layer. The electrode assembly includes a first electrode sheet, a second electrode sheet, and a separator film provided between the first electrode sheet and the second electrode sheet, which are housed in the housing and arranged in a stacked manner. The electrode assembly is provided to be wound up, The first electrode sheet has a first side and a second side facing each other along the winding direction, and a first end end that is separated from the first side. Looking along the first direction, The electrode assembly has a first surface, The first tail end is located on the first surface, The first tail end is a portion of the first electrode sheet that extends a predetermined distance from the second side along the winding direction of the electrode assembly. The second edge is located on the first surface and divides the first surface into a first region and a second region. The first region is the region where the first end is located, The first direction is perpendicular to the surface of the first layer. The first layer is fixed to the first region and the second region, The second layer is fixed to the first surface and has a gap between it and the first layer, and is used to fix the electrode assembly to the housing.

[0008] The electrode assembly provided by embodiments of the present invention includes a second layer for securing the electrode assembly to the housing. The electrode assembly and housing within the battery remain fixed before this second layer fails. Therefore, the battery provided by embodiments of the present invention can improve the battery's lifespan by reducing the risk of the electrode assembly slipping against the housing when the battery or an electronic device with a battery is dropped or struck by another object.

[0009] As a further improvement to the above technical proposal, the second layer is fixed within the second domain.

[0010] In some embodiments, when viewed along a first direction, the first region has a first edge line positioned opposite the second side, and the distance between the first edge line and the second side is defined as the first distance. The second region has a second edge line positioned opposite the second edge, and the distance between the second edge line and the second edge is defined as the second distance. The first distance is smaller than the second distance.

[0011] In some embodiments, the second layer is fixed within the first region.

[0012] In some embodiments, when viewed along a first direction, the first region has a first edge line positioned opposite the second side, and the distance between the first edge line and the second side is defined as the first distance. The second region has a second edge line positioned opposite the second edge, the distance between the second edge line and the second edge is the second distance, and the first distance is greater than the second distance.

[0013] In some embodiments, the second layer is fixed to the first region and the second region.

[0014] In some embodiments, the length of the first layer is greater than the length of the second layer along the second direction, and the second direction is the direction in which the second edge extends.

[0015] In some embodiments, along the second direction, at least one end of the first layer is located outside both ends of the second layer, and the second direction is the direction in which the second edge extends.

[0016] In some embodiments, along the third direction, the width of the first layer is greater than the width of the second layer, and the third direction is simultaneously perpendicular to the first and second directions.

[0017] In some embodiments, the first layer is rectangular, and the angle between the longer side and the second side of the first layer is θ, where 0° < θ < 15°.

[0018] In some embodiments, the outer surface of the electrode assembly has a first surface and a second surface provided opposite to each other along the first direction, and a third surface and a fourth surface provided opposite to each other along the third direction, When viewed along the second direction, both the first surface and the second surface extend along the third direction and are located between a first reference line and a second reference line, The third surface extends in a curved manner and is located on the side away from the first reference line of the second reference line, The fourth surface extends in a curved manner and is located on the side away from the second reference line (Z2) of the first reference line (Z1), The first surface, the third surface, the second surface, and the fourth surface are sequentially connected to each other, When viewed along the first direction, the first surface includes at least a part of the first surface, a part of the third surface, and a part of the fourth surface, the second side is located on the first surface, The first layer and / or the second layer are provided on the first surface, The second direction is the direction in which the second side extends, and the third direction is a direction perpendicular to both the first direction and the second direction at the same time, When viewed along the second direction, in the first electrode sheet, a point located most outward along the third direction at a first corner starting from the first side is defined as point M, The first reference line is parallel to the first direction and passes through point M, In the first electrode sheet, a point located most outward along the third direction at a second corner starting from the first side is defined as point N, The second reference line is parallel to the first direction and passes through point N.

[0019] In some embodiments, a third layer is further provided, a first end of the third layer is fixed to the first surface, and a second end of the third layer is fixed to the second surface.

[0020] In some embodiments, a first end of at least one of the third layers is fixed to the first layer, and / or, At least one first end of the third layer is fixed to the second layer, and / or At least one first end of the third layer is simultaneously fixed to the first layer and the second layer.

[0021] In some embodiments, the first electrode sheet is wound up to form a plurality of first parts and a plurality of second parts. The second electrode sheet has a third side and a fourth side arranged opposite to each other along the winding direction, is wound around the third side, and has a second end that is away from the third side, the second end being a portion formed by extending the second electrode sheet a predetermined distance from the fourth side along the winding direction, and is provided between two adjacent first parts or between two adjacent second parts. Along the winding direction, the first electrode sheet extends beyond the second end. In the first electrode sheet, the first or second portion adjacent to the second end and located on the side of the second end closest to the first edge does not have an active material layer on the side opposite to the first edge in the portion from just beyond the second end to the second edge. In some embodiments, the first and / or second layer comprises adhesive rubber. The adhesive rubber includes double-sided tape. The double-sided tape comprises a base layer and adhesive layers applied to both sides of the base layer. Alternatively, the adhesive rubber may include a hot melt adhesive.

[0022] In the second phase, the present invention provides an electronic device equipped with any of the above-mentioned batteries in order to solve the technical problems.

[0023] To provide a clearer explanation of the technical aspects of the embodiments of this application, the drawings that may be used in the description of the embodiments are briefly described below. Clearly, the drawings in the following description represent only a few embodiments of this application, and those skilled in the art may obtain other drawings based on the structures shown in these drawings. [Brief explanation of the drawing]

[0024] [Figure 1] This is a schematic, unidirectional perspective view of a battery according to the first embodiment of the present application. [Figure 2] Figure 1 is a schematic perspective view showing the battery after it has been concealed by the housing. [Figure 3] Figure 1 is a schematic diagram showing the battery as viewed along the first direction after it has concealed the housing. [Figure 4] This is a schematic diagram of the battery as seen from the opposite direction to the first direction after it has concealed the housing in Figure 1. [Figure 5] This is a bottom view of the battery in Figure 3. [Figure 6] This is a plan view of the battery in Figure 3. [Figure 7] Figure 2 is a schematic diagram of the electrode assembly after it has been unfolded. [Figure 8] This is a schematic diagram of the battery according to the first embodiment of the present application after it has been concealed by the housing. [Figure 9] This is a schematic diagram of the battery according to the second embodiment of the present application, viewed along the first direction after the housing is concealed. [Figure 10] This is a schematic diagram of the battery as seen from the opposite direction to the first direction in Figure 9. [Figure 11] This is a side view of the battery in Figure 9. [Figure 12] This is a schematic diagram showing the battery according to the third embodiment of the present application as viewed along the first direction after the housing has been concealed. [Figure 13] This is a schematic diagram of the battery as seen from the opposite direction to the first direction in Figure 12. [Figure 14] This is a schematic diagram showing the battery according to the fourth embodiment of the present application as viewed along the first direction after the housing has been concealed. [Figure 15] This is a schematic diagram showing the battery according to the fifth embodiment of the present application as viewed along the first direction after the housing has been concealed. [Figure 16] This is a schematic diagram showing the battery according to the sixth embodiment of the present application as viewed along the first direction after the housing has been concealed. [Figure 17] This is a bottom view of Figure 16. [Figure 18] This is a schematic diagram showing the battery according to the seventh embodiment of the present application along the first direction after it has concealed the housing. [Figure 19] This is a bottom view of Figure 18. [Figure 20] This is a schematic diagram showing the battery according to the eighth embodiment of the present application as viewed along the first direction after the housing has been concealed. [Figure 21] Figure 20 is a schematic diagram of the battery viewed from the opposite direction to the first direction. [Figure 22] This is a schematic diagram of the battery according to the ninth embodiment of the present application, viewed from the first direction Z after the housing has been concealed. [Figure 23] This is a schematic diagram showing the battery according to the tenth embodiment of the present application as viewed along the first direction after the housing has been concealed. [Figure 24] This is a schematic diagram showing the battery according to the 11th embodiment of the present application as viewed along the first direction after the housing has been concealed. [Figure 25] This is a schematic diagram of the battery according to the 12th embodiment of the present application, viewed along a first direction after the housing has been concealed. [Figure 26] This is a schematic diagram of the battery according to Comparative Example 1 of the present invention, viewed along the first direction after the housing is concealed. [Figure 27] This is a bottom view of Figure 26. [Figure 28] This is a schematic diagram of the battery according to Comparative Example 2 of the present invention, viewed along the first direction after the housing is concealed. [Figure 29] This is a bottom view of Figure 24. [Figure 30] This is a schematic diagram of an electronic device according to one embodiment of the present invention. [Modes for carrying out the invention]

[0025] To facilitate understanding of this application, the application will be described in more detail below with reference to the attached drawings and specific embodiments. It is necessary to explain that when one component is referred to as “fixed / attached” to another component, it may be directly present in the other component, or one or more intermediate media may be present between them. When one component is considered to be “connected” to another component, it may be directly connected to the other component, or one or more intermediate media may be present between them simultaneously. The terms “vertical,” “horizontal,” “left,” “right,” “inside,” “outside,” and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of this application. Terms used in this specification are for the purpose of describing specific embodiments and are not intended to limit this application. The terms "or / and" as used herein include any and all combinations of one or more related enumerated items.

[0027] Several embodiments of the present application will be described in detail below with reference to the attached drawings. Where there is no inconsistency, the following embodiments and features may be combined with each other.

[0028] In this specification, “mounting” includes fixing or restricting an element or device to a specific location or place by methods such as welding, screwing, engaging, or bonding, and such element or device may remain immobile in the specific location or place, or may function within a limited range. The element or device may be removable or non-removable after being fixed or restricted to a specific location or place, and is not limited in the embodiments of this application.

[0029] Figures 1 and 2 show perspective views of a battery 1 provided by a first embodiment of the present application and a perspective view of the battery 1 after it has concealed its housing, respectively. The battery includes a housing 100, an electrode assembly 200, a conductive plate 300, a first layer 400, and a second layer 500. Here, the housing 100 constitutes a base for directly or indirectly mounting each structure, and the electrode assembly 200 is housed within the housing 100. In relation to Figures 3 to 7, Figure 3 shows a schematic view of the battery 1 as seen along a first direction Z after it has concealed its housing 100, Figure 4 shows a schematic view of the battery 1 as seen from the opposite direction of the first direction Z, Figure 5 shows a bottom view of Figure 3, Figure 6 shows a top view of Figure 3, and Figure 7 shows a schematic view after the electrode elements 200 have been unfolded. The electrode assembly 200 includes a first electrode sheet 210, a second electrode sheet 220, and a separator membrane 230 arranged in a stacked configuration. The separation membrane 230 is provided between the first electrode sheet 210 and the second electrode sheet 220. The electrode assembly 200 is wound and arranged such that the first electrode sheet 210 has a first side 213 and a second side 214 facing each other along the winding direction, and a first end 212 that moves away from the first side 213 along the aforementioned winding direction. Here, the first side 213 is located at the center of the electrode assembly 200, and the second side 214 is provided away from the first side 213 and is located on the outer surface of the electrode assembly 200. The first end 212 is located on the outer surface of the electrode assembly 200 and is a portion of the first electrode sheet 210 that extends a predetermined distance from the second side 214. Viewed along the first direction Z in the figure, the electrode assembly 200 has a first surface 201, and the second edge 214 is located on the first surface 201 and divides the first surface 201 into a first region 2011 and a second region 2012. The first end 212 is located on the first surface 201. The first region 2011 is the region where the first end 212 is located. One end of the conductive plate 300 is electrically connected to the electrode assembly 200, and the other end of the conductive plate 300 extends outside the housing 100. The first layer 400 is fixed to the first region 2011 and the second region 2012. The second layer 500 is fixed to the first surface 201 with a gap between it and the first layer 400. The second layer 500 is used to fix the electrode assembly 200 to the housing 100.Here, the first direction means the direction perpendicular to the surface of the first layer 400. For ease of explanation and understanding, this specification defines the direction in which the second side 214 extends as the second direction X. In this embodiment, the second direction X is perpendicular to the first direction Z. This is because the second direction X is parallel to the axis around which the electrode assembly 200 is wound, and the first direction Z is perpendicular to this axis. In addition, the direction that is simultaneously perpendicular to both the first direction Z and the second direction X is defined as the third direction Y. Next, the specific configurations of the housing 100, electrode assembly 200, conductive plate 300, first layer 400, and second layer 500 will be described in order.

[0030] For details of the housing 100, please refer to Figure 1. The housing 100 has a relatively flat cartridge structure with a housing cavity for accommodating the electrode assembly 200, a part of the conductive plate 300, the first layer 400, and the second layer 500. In this embodiment, the battery 1 may be a flexible pack battery. Accordingly, the housing 100 is made of a flexible sheet such as an aluminum plastic film. Of course, in other embodiments of this application, the battery 1 may be a hard shell battery such as a steel shell battery or an aluminum shell battery. Also, in other embodiments of this application, the housing 100 may have other shapes such as a block shape or a columnar shape, and is not limited thereto.

[0031] Referring first to Figures 5 and 6, and in conjunction with the other drawings, the electrode assembly 200 includes a stacked first electrode sheet 210, a second electrode sheet 220, and a separator membrane 230. Here, the first electrode sheet 210 has opposite polarity to the second electrode sheet 220, with one being the positive electrode sheet and the other the negative electrode sheet. A separator membrane 230 is provided between the first electrode sheet 210 and the second electrode sheet 220 to reduce the risk of short circuits between the first electrode sheet 210 and the second electrode sheet 220. In this embodiment, the first electrode sheet 210 is the positive electrode sheet and the second electrode sheet 220 is the negative electrode sheet. Specifically, the first electrode sheet 210 includes a first current collector 2101 and a first active material layer 2102 coated on the surface of the first current collector 2101. Here, the first current collector 2101 is a carrier for the first active material layer 2102 and is a current-conducting carrier, and the first active material layer 2102 is a carrier in which lithium ions are embedded or released. In this embodiment, the first current collector 2101 is made of aluminum or an aluminum alloy. The first active material layer 2102 contains lithium iron oxide particles, low Curie-point ferromagnetic particles, a dispersant, a binder, a conductive agent, and a positive electrode solvent. After mixing these materials, they are uniformly stirred and coated onto the surface of the first current collector 2101 to obtain the first active material layer 2102. The second electrode sheet 220 includes a second current collector 2201 and a second active material layer 2202 coated on the second current collector 2201. Here, the second current collector 2201 is a carrier for the second active material layer 2202 and is a current-conducting carrier, and the second active material layer 2202 is a carrier in which lithium ions are embedded or released. In this embodiment, the second current collector 2201 is made of copper or a copper alloy, and the second active material layer 2202 contains graphite, a conductive agent, an adhesive, and deionized water. The second active material layer 2202 is obtained by mixing these materials, stirring them uniformly, and applying the mixture to the surface of the second current collector 2201. Of course, in other embodiments of this application, the first electrode sheet 210 may be a negative electrode sheet, and accordingly, the second electrode sheet 220 may be a positive electrode sheet, and the corresponding material arrangement may be the exact opposite. The laminated first electrode sheet 210, the second electrode sheet 220, and the separator film 230 are all wound together and form an oval columnar structure in a cross section perpendicular to the second direction X.

[0032] Of particular note is that the function of the separation membrane 230 in this application is mainly to separate the first electrode sheet 210 and the second electrode sheet 220 and conduct ions, and there are no restrictions on its material. In some embodiments, the separation membrane 230 includes a porous substrate. In some embodiments, the separation membrane 230 further includes a functional coating disposed on the porous substrate. The functional coating may include at least one of adhesives or inorganic particles. In some embodiments, the porous substrate is a polymer film, multilayer polymer film, or nonwoven fabric formed from any polymer or a mixture of two or more polymers selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyphenylphenylenediamine, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cycloolefin copolymer, polyphenylene sulfide, and polyethylene naphthalene. Such polymers have high thermal stability, are easy to surface treat, and are easy to coat. Furthermore, such polymers have good toughness and are easily bendable. In some examples, the adhesive comprises at least one of the following: vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-trichloroethylene copolymer, polyacrylic acid ester, polyacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, ethylene-vinyl acetate copolymer, polyimide, polyoxyethylene, cellulose acetate, cellulose butyrate acetate, cellulose propionate acetate, cyanoethyl branched starch, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, amylopectin, sodium carboxymethylcellulose, lithium carboxymethylcellulose, acrylonitrile-styrene-butadiene copolymer, polyvinyl alcohol, polyvinyl ether, polytetrafluoroethylene, polyhexafluoropropylene, styrene-butadiene copolymer, and polyvinylidene fluoride.These polymers exhibit strong adhesive properties, which can bond inorganic particles or bond and integrate the separation membrane 230 with the first electrode sheet 210 / second electrode sheet 220, thereby increasing the hardness of the electrode assembly 200. In other embodiments, the adhesive may also include other polymers. In some embodiments, the inorganic particles include at least one of silica, alumina, titanium oxide, zinc oxide, magnesium oxide, hafnium dioxide, tin oxide, zirconium oxide, yttrium oxide, silicon carbide, boehmite, magnesium hydroxide, aluminum hydroxide, calcium titanate, barium titanate, lithium phosphate, lithium titanium phosphate, and lithium lanthanum titanate. All of these inorganic particles have high thermal stability and can improve the high-temperature resistance of the battery 1.

[0033] The electrode assembly 200 is arranged by winding a first electrode sheet 210 and a second electrode sheet 220, which are folded multiple times and stacked in multiple layers in the first direction Z described above. The first electrode sheet 210 has a first side 213 and a second side 214 that are opposite to each other along the winding direction. Here, the first side 213 is located at the winding center of the electrode assembly 200, and the second side 214 is located at the end of the first electrode sheet 210 opposite to the first side 213 and is located on the outer surface of the electrode assembly 200. Observing along the second direction X shown in Figure 5, the first point M is the outermost point along the third direction Y at the first corner of the first electrode sheet 210 starting from the first side 211, along the winding direction of the electrode assembly 200. A straight line parallel to the first direction Z is created with this first point M as the reference, and this straight line is defined as the first reference line Z1. Observing along the second direction X and along the winding direction of the electrode assembly 200, the second point N is the outermost point along the third direction Y at the second corner starting from the first side 211 on the first electrode sheet 210. Using this second point N as a reference, a straight line parallel to the first direction Z is drawn and defined as the second reference line Z2. Then, the first electrode sheet 210 has a first start end 211 and a first end end 212 that are arranged opposite each other along the winding direction. Here, the first start end 211 is the portion of the first electrode sheet 210 that extends along the winding direction from the first side 213 to the point where it first intersects with the first reference line Z1 described above. The first end end 212 is the convergence portion of the first electrode sheet 210. Specifically, the first end 212 is a portion of the first electrode sheet 210 that is on the first surface 201 when observed along the first direction Z and is formed by extending a preset distance from the second side 214 along the winding direction. In this embodiment, the first end 212 is a portion of the first electrode sheet 210 that is formed by extending along the winding direction from the second side 214 to one of the first reference line Z1 and the second reference line Z2 that is close to the second side 214. In this embodiment, the first end 212 is a portion of the first electrode sheet 210 that is formed by extending along the winding direction from the second side 214 to one of the first reference line Z1 and the second reference line Z2 that is close to the second side 214.Specifically, along the winding direction described above, the second side 214 is close to the first reference line Z1. The preset distance is the distance extending from the second side 214 to the first reference line Z1. The first end end 212 is the portion of the first electrode sheet 210 that extends from the second side 212 to the point where it first intersects the first reference line Z1. Of course, in other embodiments, the first end end 212 is adaptively adjusted to be slightly longer or shorter than described above.

[0034] The first electrode sheet 210 is wound to form a plurality of first parts 215 located between the first reference line Z1 and the second reference line Z2, and a plurality of second parts 216 located outside both the first reference line Z1 and the second reference line Z2. Viewed along the second direction X, the first parts 215 extend along the third direction Y, and each first part 215 is provided sequentially along the first direction Z. The plurality of first parts 215 are divided into first parts 215a and first parts 215b. Here, the direction determined by one end of the first part 215a closer to the first reference line Z1 pointing towards the other end closer to the second reference line Z2 is opposite to the direction in which the first electrode sheet 210 extends from the first side 213 to the second side 214. The direction defined by the fact that one end of the first part 215b near the first reference line Z1 points towards the other end near the second reference line Z2 is the same as the direction extending from the first side 213 to the second side 214 of the first electrode sheet 210. As shown in Figure 5, each first part 215a is located below each first part 215b. Specifically, along the first direction Z, each first part 215a is closer to the second surface 2014 than each first part 215b, and each first part 215b is closer to the first surface 2013 than each first part 215a, the first surface 2013 and the second surface 2014 will be explained later. Along the winding direction of the first electrode sheet 210, the second part 216 is located between two adjacent first parts 215 and connects two adjacent first parts 215. The above-mentioned multiple second parts 216 are divided into second parts 216a and 216b. Here, the second part 216a is located on the opposite side of the first part 215 of the first reference line Z1 and connects the first part 215a and the first part 215b. Each second part 216a is provided in order from the inside to the outside. The second part 216b is located on the opposite side of the first part 215 of the second reference line Z2 and connects the first part 215b and the first part 215a. Each second part 216b is provided in order from the inside to the outside.

[0035] The second electrode sheet 220 has a third side 223 and a fourth side 224 that are positioned opposite each other along the winding direction. Here, the second electrode sheet 220 is wound around the third side 223, and the fourth side 224 is located at one end away from the third side 223 of the second electrode sheet 220. Observing along the second direction X, the third point O is the outermost point along the third direction Y at the first corner starting from the third side 223 of the second electrode sheet 220 along the winding direction of the electrode assembly 200. A straight line parallel to the first direction Z is drawn with respect to this third point O, and this line is defined as the third reference line Z3. The fourth point P is the outermost point along the third direction Y at the second corner starting from the third side 223 of the second electrode sheet 220 along the winding direction of the electrode assembly 200. Using this fourth point P as a reference, a straight line parallel to the first direction Z is created, and this line is defined as the fourth reference line Z4. The second electrode sheet 220 has a second start end 221 and a second end end 222 that are arranged opposite each other along the winding direction. Here, the second start end 221 is the portion of the second electrode sheet 220 that extends along the winding direction from the third side 223 to the point where it first intersects the third reference line Z3. The second end end 222 is the convergence portion of the second electrode sheet 220. Specifically, the second end end 222 is the portion of the second electrode sheet 220 that is formed by extending a preset distance along the winding direction from the fourth side 224 when observed along the second direction X (or first direction Z). In this embodiment, along the winding direction of the second electrode sheet 220, the second end end 222 is a portion of the second electrode sheet 220 that extends from the fourth side 224 to one of the third reference line Z3 and the fourth reference line Z4 that is closer to the fourth side 224. Specifically, along the winding direction described above, the fourth side 224 is close to the fourth reference line Z4. The preset distance is the distance from the fourth side 224 to the point where it first intersects with the fourth reference line Z4. The second end end 222 is the portion of the second electrode sheet 220 that extends from the fourth side 224 to the point where it first intersects with the fourth reference line Z4. Of course, in other embodiments, the second end end 222 is adaptively adjusted to be slightly longer or shorter than described above.

[0036] The second electrode sheet 220 is wound to form a plurality of third sections 225 located between the third reference line Z3 and the fourth reference line Z4, and a plurality of fourth sections 226 located outside the third reference line Z3 and the fourth reference line Z4. The third sections 225 extend substantially parallel to each other, and each third section 225 is provided sequentially along the first direction Z. The plurality of third sections 225 are divided into third sections 225a and third sections 225b. Here, the direction determined by one end of the third section 225a closer to the third reference line Z3 pointing towards the other end closer to the fourth reference line Z4 is opposite to the direction in which the second electrode sheet 220 extends along the third side 223 to the fourth side 224. The direction defined by the pointing of one end of the third part 225b closer to the third reference line Z3 towards the other end closer to the fourth reference line Z4 is the same as the direction pointing from the third side 223 to the fourth side 224 of the second electrode sheet 220. The fourth part 226 is located between two adjacent third parts 225 along the winding direction of the second electrode sheet 220, connecting the two adjacent third parts 225. The above-mentioned multiple fourth parts 226 are divided into fourth parts 226a and 216b. Here, the fourth part 226a is located on the opposite side of the third part 225 of the third reference line Z3, and the fourth part 226b is located on the opposite side of the third part 225 of the fourth reference line Z4. It should be explained that the term "flat" as used in this specification does not mean absolute flatness in a geometric sense, but rather that a part with an appropriate flatness deviation extends along approximately a certain linear direction, allowing for an appropriate flatness deviation. For example, in some embodiments, the flatness of the third part 225 may be 10 μm or less.

[0037] In this embodiment, the aforementioned second end 222 is provided between two adjacent first parts 215. Along the winding direction, the first electrode sheet 210 is positioned on both sides of the separation membrane 230 at the second end 222, that is, this battery 1 ends at the first electrode sheet 210. In this embodiment, when viewed along the second direction X, the portion of the first electrode sheet 210 from the point where it crosses the second end of the first part 215 adjacent to the second end 222 and on the side closer to the first side 213 of the second end 222, up to the second side 214, is a single-sided coated region. When observed along the second direction X, the first current collector does not have the first active material layer coated on the side opposite to the first side 213 in this single-sided coated region. That is, when observed along the second direction X, the active material layer is not provided on the side opposite to the first side 213 of the single-sided coated region. Since the electrode assembly 200 does not have a second electrode sheet 220 on the side away from the winding center of the single-sided coating area, the first current collector 2101 does not participate in the electrochemical reaction even if the active material is coated on the side opposite to the first side 213 in this area. The arrangement of the single-sided coating area is advantageous in saving material in the electrode assembly 200 and increasing the energy density of the battery 1. In the first electrode sheet 210, the active material layer is not coated on both sides of the portion from just beyond the second end 222 of the first part 215 to the first end 212, which is adjacent to the second end 222 and located opposite the first side 213 of the second end 222. This arrangement is also advantageous in saving material in the electrode assembly 200 and increasing the energy density of the battery 1. In other embodiments, the second end 222 may be located between two adjacent second parts 215. In this case, in the first electrode sheet 210, the portion of the second part 216 adjacent to the second end 222 and facing the first side 213 of the second end 222, from the point where it crosses the second end 222 to the second side 214, is a single-sided coated area. Accordingly, in the first electrode sheet 210, the portion of the second part 216 adjacent to the second end 222 and on the opposite side of the first side 213 of the second end 222, from the point where it crosses the second end 222 to the second side 214, is not coated with the first active material layer. In this embodiment, the electrode assembly 200 is brought together by the positive electrode sheet, and both the first layer 400 and the second layer 500 are provided on the surface of the aluminum foil.However, in other embodiments of the present application, the electrode assembly 200 may be converged by a negative electrode sheet. In this case, the first layer 400 and the second layer 500 are provided on the surface of the copper foil.

[0038] Specifically, as can be seen by referring to Figure 6 in conjunction with other drawings such as Figures 3 to 5, the electrode assembly 200 is wound to form an annular outer surface. This outer surface specifically includes a first surface 2013, a second surface 2014, a third surface 2015, and a fourth surface 2016. Here, viewed along the second direction X, the first surface 2013 and the second surface 2014 extend along the third direction Y and are both located between the first reference line Z1 and the second reference line Z2, and are arranged relative to each other along the first direction Z shown in the figure. Looking along the second direction X, the third surface 2015 and the fourth surface 2016 both extend in a curved manner and are separated on both sides of the first surface 2013 along the winding direction. Here, the third surface 2015 is located on the side of the second reference line Z2 farther from the first reference line Z1, and the fourth surface 2016 is located on the side of the first reference line Z1 farther from the second reference line Z2. The first surface 2013, the third surface 2015, the second surface 2014, and the fourth surface 2016 are connected in sequence to jointly form the annular outer surface of the electrode assembly 200.

[0039] Refer to Figure 3 in conjunction with the other drawings. Observed along the first direction Z, the electrode assembly 200 has a first surface 201, which includes at least a portion of the first surface 2013, a portion of the third surface 2015, and a portion of the fourth surface 2016. Observed along the first direction Z, the first surface 201 includes a first edge line 20111 and a second edge line 20121, which are opposite each other along the third direction Y, and a third edge line 20112 and a fourth edge line 20122, which are opposite each other along the second direction X. The second edge 214 is located on the first surface 201 and divides the first surface 201 into a first region 2011 and a second region 2012, where the first region 2011 is the region where the first end 212 is located. In this embodiment, the second edge 214 is specifically located on the first surface 2013. The first region 2011 is substantially rectangular and has a first edge line 20111 positioned opposite the second side 214 along the third direction Y. There is a first distance L1 between the first edge line 20111 and the second side 214 along the third direction Y. The second region 2012 is also substantially rectangular and has a second edge line 20121 positioned opposite the second side 214 along the third direction Y. There is a second distance L2 between the second edge line 20121 and the second side 214 along the third direction Y. In this embodiment, the first distance L1 is smaller than the second distance L2. The third edge line 20112 is formed by winding the long side of the first electrode sheet 210, and the fourth edge line 20122 is formed by winding the other long side of the first electrode sheet 210, and the two are positioned opposite each other along the second direction X. The aforementioned first edge line 20111, second edge line 20121, third edge line 20112, and fourth edge line 20122 jointly surround and form the first surface 201. As shown in Figures 4 and 6, when viewed from the opposite direction of the first direction Z, the electrode assembly 200 has a second surface 202. The second surface 202 includes at least a portion of the second surface 2014, a portion of the third surface 2015, and a portion of the fourth surface 2016.

[0040] For details of the conductive plate 300, please refer to Figure 3 in conjunction with the other drawings. The conductive plate 300 has a flattened structure, with one end electrically connected to the electrode assembly 200 and the other end extending outside the housing 100 to form the conductive terminal of the battery 1. In this embodiment, the battery 1 includes two conductive plates 300, which are the first conductive plate 300a and the second conductive plate 300b shown in the illustration. One end of the first conductive plate 300a enters the inside of the electrode assembly 200 and is connected to the first electrode sheet 210, while the other end of the first conductive plate 300a extends outside the housing 100 along the second direction X. When observed along the first direction Z, the first conductive plate 300a overlaps with the edge of the first surface 201, i.e., the third edge line 20112. The material of the first conductive plate 300a includes aluminum. For example, the first conductive plate 300a is made of aluminum, or the first conductive plate 300a includes a first substrate made of aluminum and a nickel layer plated on the surface of this first substrate. Of course, in other embodiments, the first conductive plate 300a may be made of any other suitable material such as nickel. The second conductive plate 300b has one end that enters into the electrode assembly 200 and is connected to the second electrode sheet 220, and the other end that extends out of the housing along the second direction X. Viewed along the first direction Z, the second conductive plate 300b and the third edge line 20112 of the first surface 201 overlap each other. The material of the second conductive plate 300b includes copper. For example, the second conductive plate 300b is made of copper, or includes a second substrate made of copper and a nickel layer plated on the surface of this second substrate. Of course, in other embodiments, the second conductive plate 300b may be made of any other suitable material such as nickel. It should be understood that in other embodiments of the present invention, the battery 1 may include other numbers of conductive plates 300, such as three or more.

[0041] As can be seen by referring to Figure 3 in conjunction with the other drawings, the first layer 400 is fixed to the first surface 201 and is provided on the second side 14 which is the boundary between the first region 2011 and the second region 2012, and is partially fixed to the first region 2011 and the second region 2012, and further fixes the first end 212 of the first electrode sheet 210. In this embodiment, the first layer 400 includes an adhesive that fixes the first end 214 by bonding. The first layer 400 has a stripe shape extending along the second direction X shown in the figure, and in the third direction Y shown in the figure, it straddles the second side 214, fixing the first end 212 closer to the inner ring than the first end 212 of the first electrode assembly 200. Specifically, the first layer 400 includes a first side 401, a second side 402, a third side 403, and a fourth side 404. Both the first side 401 and the third side 403 extend along the second direction X. The second side 402 and the fourth side 404 are positioned opposite each other along the second direction X and are connected to the first side 401 and the third side 403, respectively. These first side 401, second side 402, third side 403, and fourth side 404 are sequentially connected and enclosed in a closed manner, which may be, for example, a rectangle. In some embodiments, at least one of the first side 401, second side 402, third side 403, and fourth side 404 is provided with a recess that is recessed into the opposing side and a protrusion that is projected away from the opposing side. For example, as shown in Figure 3, the second side 402 is provided with a recess 402a that is recessed toward the fourth side 404, and / or a protrusion 402b that is projected away from the third side 403.

[0042] In this embodiment, the first layer 400 is fixed to the first surface 201 on one end and to the inner wall of the housing 100 on the other. Thus, the first layer 400 not only fixes the first end 212 but also serves to fix the electrode assembly 200 to the housing 100. Specifically, the adhesive rubber includes double-sided tape. The double-sided tape includes a base layer and adhesive layers applied to both sides of the base layer. This adhesive rubber is fixed to the first surface 201 via one adhesive layer and to the inner surface of the housing 100 via the other adhesive layer. There is a wide variety of materials that can be used for the double-sided tape. The base layer can include at least one of polyester resin, cellulose derivative, polyvinyl chloride, polyolefin, polystyrene, polyester, polyimide, polyamide, polycarbonate, or polyphenylene sulfide. The adhesive layer can include at least one of rubber-based resin, acrylic-based resin, or silicone-based resin. The present invention can be adaptively adjusted based on the material, provided that the double-sided tape can secure the first end and fix the electrode assembly 200 to the housing 100. In other embodiments of the present invention, the adhesive rubber may be a hot-melt adhesive or other adhesive rubber having viscosity on both sides, which are not described in detail here. On the other hand, under conditions where the first layer 400 does not need to have the function of fixing the electrode assembly 200 to the housing 100, the adhesive rubber may be an adhesive layer having viscosity on only one side, such as single-sided rubber. Furthermore, in other embodiments of the present invention, the first layer 400 may be any other element that enables the fixing of the first end 214.

[0043] Referring again to Figures 3 and 4, the second layer 500 is fixed to the first surface 201 and simultaneously to the inner wall of the housing 100, thereby fixing the electrode assembly 200 to the housing 100. The second layer 500 has a stripe-like structure extending along the second direction X shown in the figure, and is provided entirely within the second region 2012 so that the second region 2012 is fixed to the housing 100. The second layer 500 has a stripe-like structure extending along the second direction X shown in the figure, and includes a first side edge 501, a second side edge 502, a third side edge 503, and a fourth side edge 504. The first side edge 501 and the third side edge 503 both extend along the second direction X. The second side edge 502 and the fourth side edge 504 are arranged opposite each other along the second direction X and are connected to the first side edge 501 and the third side edge 503, respectively. The first side edge 501, second side edge 502, third side edge 503, and fourth side edge 504 are sequentially connected and enclosed in a closed manner, and may be, for example, substantially rectangular in shape. In some embodiments, at least one of the first side edge 501, second side edge 502, third side edge 503, and fourth side edge 504 is provided with a recess that is recessed toward the opposing side and a convex portion that protrudes outward from the opposing side. For example, as shown in Figure 3, the second side edge 502 has a recess 502a that is recessed toward the fourth side edge 504, and / or a convex portion 502b that protrudes outward from the third side edge 503. In this embodiment, the second layer 500 includes adhesive rubber for fixing the electrode assembly 200 and the housing 100 by adhesion. The adhesive rubber may be a double-sided tape including a base layer and adhesive layers provided on both sides of the base layer. The base layer may contain at least one of polyester resin, cellulose derivative, polyvinyl chloride, polyolefin, polystyrene, polyester, polyimide, polyamide, polycarbonate, or polyphenylene sulfide. The adhesive layer may contain at least one of rubber resin, acrylic resin, or silicone resin. Of course, the present invention may be adaptively adjusted based on the materials, as long as the double-sided tape can fix the electrode assembly and the housing. Of course, in other embodiments of the present invention, the second layer 500 may be any other member that can fix the first surface 201 and the inner wall of the housing 100.For example, the second layer 500 may be a double-sided adhesive layer, such as a hot-melt adhesive. Along the second direction X, the length of the second layer 500 may be substantially the same as the length of the first layer 400, and both ends may be substantially aligned. In this embodiment, there is a gap between the second layer 500 and the first layer 400, and the second layer 500 is located outside the first region 2011, i.e., they are provided separately. In some other embodiments of the present application, the first layer 400 and the second layer 500 may be provided integrally, but under the same bonding area conditions, the integrally provided method may result in more air bubbles remaining inside when the integral structure is fixed to the first surface 201, potentially reducing the overall fixing effect of the first layer 400 and the second layer 500. Conversely, if the first layer 400 and the second layer 500 are provided separately, this deficiency can be overcome.

[0044] Other embodiments of the present invention may be adaptively adapted on the above foundation. For example, the second layer 500 may be provided in the first region 2011, or, for example, as shown in Figure 8, the width W1 of the first layer 400 is greater than the width W2 of the second layer 500 along the third direction Y. Since the first layer 400 needs to be connected simultaneously to the first region 2011, the second region 2012 and the inner wall of the housing 100, and the second layer 500 needs to be connected simultaneously to the second region 2012 and the inner wall of the housing 100, the probability of the first layer 400 separating from the connected region is higher than that of the second layer 500 if they are the same width, and the above installation aims to enhance the fixing effect of the first layer 400. Also, for example, both ends of the first layer 400 are not aligned with both ends of the second layer 500, and along the second direction X, at least one end of the first layer 400 is located outside both ends of the second layer 500.

[0045] The battery 1 provided by the embodiment of the present application includes a housing 100, an electrode assembly 200, a first layer 400, and a second layer 500. Here, the electrode assembly 200 includes a first electrode sheet 210, a second electrode sheet 220, and a separator membrane 230. The electrode assembly 200 is wound such that the first electrode sheet 210 has a first side 213 and a second side 214 facing each other along the winding direction, and a first end 212 away from the winding center of the electrode assembly 200. Viewed along the first direction Z shown in the figure, the electrode assembly 200 has a first surface 201, the second side 214 is located on the first surface 201 and divides the first surface 201 into a first region 2011 and a second region 2012. The first region 2011 is the region where the first end 212 is located. A portion of the first layer 400 is fixed to the first region 2011, and the other portion of the first layer 400 is fixed to the second region 2012. The second layer 500 is fixed to the first surface 201, has a gap between it and the first layer 400, and is used to fix the electrode assembly 200 and the housing 100.

[0046] The battery 1 provided by the embodiment of the present invention further comprises a second layer 50 compared to currently available commercially available batteries. This second layer 50 reduces the risk of the electrode assembly slipping against the housing when the battery 1 or an electronic device containing the battery 1 is dropped, by securing the electrode assembly 200 to the housing 100.

[0047] In addition to fixing the first end 212, the first layer 400 also fixes the electrode assembly 200 to the housing 100, and further enhances the overall fixing effect of the electrode assembly 200.

[0048] The embodiments described above are merely one embodiment of the present application, and the present application is not limited to the embodiments described above, but can be adaptively modified based on the embodiments, provided that the battery includes a second layer 500. For example, Figure 9 is a schematic diagram of the battery 1b provided in a second embodiment of the present application as viewed along a first direction after the housing 100 has been concealed, Figure 10 is a schematic diagram of the battery 1b as viewed from the opposite direction of the first direction after the housing has been concealed, and Figure 11 is a schematic diagram of the battery 1b as viewed along a third direction. Referring simultaneously with Figures 1 to 8, the battery 1b includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, and a second layer 500, and the main difference from the battery 1 provided in the first embodiment is that the battery 1b further includes a third layer 600. Specifically, the third layer 600 is provided in a stripe shape, with its first end fixed to the first surface 2013 and its second end fixed to the second surface 2014 after bypassing the end of the electrode assembly 200. The third layer 600 is under tension so that it can firmly clamp the electrode assembly 200 in the first direction Z. In some embodiments, the third layer 600 includes an adhesive rubber comprising a base layer and an adhesive layer, where the base layer comprises at least one of polyester resin, cellulose derivative, polyvinyl chloride, polyolefin, polystyrene, polyester, polyimide, polyamide, polycarbonate, or polyphenylene sulfide. The adhesive layer is provided on the surface of the base layer and comprises at least one of rubber resin, acrylic resin, and silicone resin. The adhesive layer is viscous, and the third layer 600 is thereby fixed to the electrode assembly 200. Of course, the present invention may perform adaptive adjustments on the material and fix the third layer 600 to both sides of the electrode assembly 200 facing the first direction Z. Of course, in other embodiments of the present invention, the third layer 600 may be any other element that can fix the first surface 201 to the inner wall of the housing 100. For example, the third layer 600 may be a double-sided adhesive layer, such as a hot melt adhesive. In this embodiment, the battery 1b includes three third layers 600, which are shown as third layer 600a, third layer 600b, and third layer 600c.Here, the third layer 600a is provided at one end of the electrode assembly 200 near the conductive plate 300, and the third layers 600b and 600c are provided at the end of the electrode assembly 200 opposite to the conductive plate 300. In this embodiment, at least one third layer 600 simultaneously covers at least a portion of the first region 2021 and the second region 2012, enhancing the fixing effect to the first end 212. Optionally, the third layer 600 is single-sided rubber. Of course, in other embodiments, the third layer 600 may be double-sided tape. In this case, the third layer 600 may also separately provide the effect of fixing the electrode assembly 200 to the housing 100. In other embodiments of the present application, the number of third layers 600 may be other numbers.

[0049] Compared to the battery 1 provided in the first embodiment, this battery 1b not only reduces the risk of the electrode assembly slipping against the housing when the battery 1 or an electronic device equipped with the battery 1 is dropped, but also enhances the effect of the electrode assembly 200 maintaining its wound state, making the electrode assembly 200 less likely to be scattered by a fall.

[0050] Furthermore, for example, Figures 12 and 13 show schematic diagrams of the battery 1c provided by the third embodiment of the present application in two directions after the housing has been concealed. As can be seen by referring to Figures 1 to 11, the battery 1c includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, a second layer 500, and a third layer 600. The main difference from the battery 1b provided by the second embodiment is that in the battery 1c, at least one of the first layer 400 and the second layer 500 is fixed to at least one third layer 600. Next, we will explain using the example of the battery 1c including three third layers 600. Note that in other embodiments of the present application, the battery 1c may include a different number of third layers 600. Specifically, the three third layers 600 are the third layer 600a, the third layer 600b, and the third layer 600c, respectively. Here, the third layer 600a is provided at one end of the electrode assembly 200 closest to the conductive plate 300. The first end of the third layer 600a is bonded and fixed to the first surface 2013, and at least a portion of it is fixed to a portion of the first layer 400 and a portion of the second layer 500. The second end of the third layer 600a is fixed to the second surface 2014. The third layers 600b and 600c are both provided at one end of the electrode assembly 200 away from the conductive plate 300. Here, the first end of the third layer 600b is bonded and fixed to the first surface 2013, and at least a portion of it is fixed to a portion of the second layer 500. The second end of the third layer 600b is fixed to the second surface 2014. The first end of the third layer 600c is bonded and fixed to the first surface 2013, and at least a portion of it is fixed to a portion of the first layer 400. The second end of the third layer 600c is fixed to the second surface 2014. In other embodiments of the present invention, adaptive adjustments can also be made on top of it, provided that the first end of at least one of the first layer 400 and the second layer 500 is fixed to at least one of them.

[0051] In the battery 1b provided in the second embodiment, the first end of the third layer is directly fixed to the first surface 2013, and the adhesive effect is ordinary. In contrast, in battery 1c, the first end of the third layer 600 is fixed by bonding it to the first layer 400 (and / or second layer 500), which is made of adhesive rubber. Since the surfaces on which the third layer 600 and the first layer 400 (and / or second layer 500) adhere to each other are both viscous, this arrangement can enhance the fixing effect of the third layer 600 itself. Of course, since the third layer 600 covers a part of the first layer 400 (and / or second layer 500), the fixing area between the first layer 400 (and / or second layer 500) and the housing 100 is reduced to some extent. In this case, the deficiency can be overcome by appropriately increasing the area of ​​the first layer 400 (and / or second layer 500) or by selecting double-sided tape as the third layer 600.

[0052] Furthermore, for example, Figure 14 shows a schematic diagram of the battery 1d provided by the fourth embodiment of the present application after the housing has been concealed. Referring in conjunction with Figures 1 to 13, this battery 1d still includes a housing, electrode assembly 200, conductive plate 300, first layer 400, second layer 500 and third layer 600, and the main difference from the battery 1c provided by the third embodiment is that, along the second direction X, the length of the first layer 400 in this battery 1d is greater than the length of the second layer 500, and the difference in length between the two along the second direction X is shown as ΔL in the figure. Because the electrode assembly 200 is wound, there is a large internal force at the first end 212 of the electrode assembly 200, and the flatness at the second side 214 is also inferior to other parts of the electrode assembly 200. On the other hand, by installing the first layer 400 longer than the second layer 500, a stronger fixing effect can be achieved by a larger covering area, while the second side 214 can be covered more, thereby increasing its flatness.

[0053] Furthermore, for example, Figure 15 shows a schematic diagram of the battery 1e provided by the fifth embodiment of the present application after the housing has been concealed. Referring in conjunction with Figures 1 to 14, this battery 1d still includes a housing, electrode assembly 200, conductive plate 300, first layer 400, second layer 500 and third layer 600, and the main difference from the battery 1c provided by the third embodiment is that the extending direction of the first layer 400 does not extend along the second direction X, but rather there is an angle θ between it and the second direction X. Specifically, the first layer 400 is rectangular and includes a first side 401, a second side 402, a third side 403 and a fourth side 404. Here, the first side 401 and the third side 403 are the long sides of the first layer 400, and the angle between the first side 401 and the second side 214 is θ. The first layer 400 is positioned at an angle with respect to the second side 214, and the dimension of the first layer 400 along the second direction X can be made greater than the length of the first side 401. That is, the length of the first layer 400 covering the second side 214 can be increased, and the flatness of the electrode assembly 200 at the second side 214 can be further improved. To prevent the ends of the first layer 400 from being so inclined that they cannot cover the second side 214, it is preferable that the angle θ satisfies the condition 0° < θ < 15°.

[0054] Furthermore, for example, Figure 16 is a schematic diagram of the battery 1f provided in the sixth embodiment of the present application as viewed along the first direction after the housing has been concealed. Figure 17 shows a bottom view of Figure 16. Referring in conjunction with Figures 1 to 15, the battery 1f includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, a second layer 500, and a third layer 600, the main difference from the battery 1c provided in the third embodiment being that the second layer 500 is fixed within the first region 2011 of the first surface 201, i.e., located outside the second region 2011. In this embodiment, the first distance L1 is greater than the second distance L2, i.e., the second side 214 is located to the left of the first surface 201 as shown in Figure 13. The first layer 400 is located at the boundary between the first region 2011 and the second region 2012, with a portion of it fixed to the first region 2011 and the other portion fixed to the second region 2012. The second layer 500 is fixed to the first region 2011, and there is a gap between it and the first layer 400.

[0055] In the battery 1c provided by the third embodiment, if subjected to a strong impact, the second layer 500 may tear a portion of the first current collector beneath it, and since the side of the first current collector toward the first edge 213 is covered with active material, this may lead to the detachment of the active material from the electrode assembly 200. In contrast, in the battery 1f provided by this embodiment, even if the second layer 500 tears the fluid collector beneath it when subjected to a strong impact, neither side of the first fluid collector beneath the second layer 500 is covered with active material, thus preventing the detachment of active material and further reducing, and ultimately eliminating, the risk. Other embodiments of the present application can be adaptively adjusted thereon, for example, the second layer 500 is still provided in the first region 2011, but the first distance L1 is smaller than the second distance L2.

[0056] Furthermore, for example, Figure 18 shows a schematic diagram of the battery 1g provided by the seventh embodiment of the present application after the housing 100 has been concealed, and Figure 19 shows a bottom view of Figure 18. Referring in conjunction with Figures 1 to 16, this battery 1g includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, and a second layer 500. The main difference from the battery 1 provided by the first embodiment is that in this battery 1g, both the first layer 400 and the second layer 500 have the effect of connecting the electrode assembly 200 and the housing, and the two are installed integrally. As can be seen from the preceding paragraph, the integrated installation of the first layer 400 and the second layer 500 simplifies the fixing process of the second layer 500 and can shorten the manufacturing cycle of the battery 1g, but it is more likely to leave more air bubbles and may further reduce the fixing strength between the second layer 500 and the electrode assembly 200.

[0057] Furthermore, for example, Figure 20 shows a schematic view of the battery 1h provided in the eighth embodiment of the present application as seen along the first direction after the housing is concealed, and Figure 21 shows a schematic view of the battery 1h as seen along the opposite direction of the first direction Z. Referring in conjunction with Figures 1 to 15, the battery 1h includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, a second layer 500, and a third layer 600, the main difference from the battery 1c provided in the third embodiment being that one end of the third layer 600 is fixed to at least one of the first layer 400 and the second layer 500. In this embodiment, the third layer 600 is fixed to the surface of the electrode assembly 200, and a portion of at least one of the first layer 400 and the second layer 500 is fixed to the third layer 600. Next, an example in which the battery 1h includes three third layers 600 will be described. Specifically, the three third layers 600 described above are third layer 600a, third layer 600b, and third layer 600c, respectively. Here, third layer 600a is provided at one end of the electrode assembly 200 closest to the conductive plate 300, with its first end adhesively fixed to the first surface 2013 and its second end fixed to the second surface 2014. The end of the first layer 400 and / or second layer 500 closest to the conductive plate 300 is fixed to the first end of the third layer 600. Both third layer 600b and third layer 600c are provided at the end of the electrode assembly 200 opposite to the conductive plate 300. Of these, the first end of third layer 600b is adhesively fixed to the first surface 2013, and its second end is fixed to the second surface 2014. One end of the second layer 500 opposite to the conductive plate 300 is fixed to the first end of the third layer 600b. The first end of the third layer 600c is adhesively fixed to the first surface 2013, and the second end of the third layer 600c is fixed to the second surface 2014. One end of the first layer 400 opposite to the conductive plate 300 is fixed to the first end of the third layer 600c. In conjunction with the third embodiment described above, other embodiments of the present application can be adaptively modified thereon, provided that at least one first end of the third layer 600 is fixedly connected to at least one of the first layer 400 and the second layer 500.

[0058] Furthermore, for example, Figure 22 shows a schematic view of a battery 1j provided by the ninth embodiment of the present application, viewed along the first direction Z after the housing has been concealed. This battery 1j includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, and a second layer 500. The main difference between this battery 1j and battery 1 is that, along the second direction X, the length of the first layer 400 in battery 1j is greater than the length of the second layer 500, and the difference in length between the two along the second direction X is ΔL as shown in the figure. Because the electrode assembly 200 is wound, there is a large internal force at the first end 212 of the electrode assembly 200, and the flatness at the second side 214 is also inferior to other parts of the electrode assembly 200. On the other hand, by installing the first layer 400 longer than the second layer 500, a stronger fixing effect can be achieved by a larger covering area, while the flatness at the second side 214 can be improved by covering more of it. Furthermore, the main difference between this battery 1j and the battery 1d mentioned above is that battery 1j does not contain the third layer 600.

[0059] Furthermore, for example, Figure 23 is a schematic diagram of a battery 1k provided by the tenth embodiment of the present application as viewed along the first direction Z after the housing has been concealed. This battery 1k includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, and a second layer 500. The main difference between battery 1k and battery 1 is that the direction of extension of the first layer 400 does not make an angle θ with the second direction X and extends along the second direction X. Specifically, the first layer 400 is rectangular and includes a first side 401, a second side 402, a third side 403, and a fourth side 404. Here, the first side 401 and the third side 403 are the long sides of the first layer 400, and there is the aforementioned angle θ between the first side 401 and the second side 214. By positioning the first layer 400 at an angle with respect to the second side 214, the dimension of the first layer 400 along the second direction X can be made larger than the length of the first side 401, that is, the length over which the first layer 400 covers the second side 214 can be increased, and furthermore, the flatness of the electrode assembly 200 at the second side 214 can be improved. In order to avoid the ends of the first layer 400 being so inclined that they cannot cover the second side 214, it is preferable that the angle θ satisfies 0° < θ < 15°. Another main difference between this battery 1k and the battery 1e is that the battery 1k does not include a third layer 600.

[0060] Furthermore, for example, Figure 24 shows a schematic view of a battery 1m provided in the 11th embodiment of the present application, as seen along the first direction Z after the housing has been concealed. This battery 1m includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, and a second layer 500. The main difference between this battery 1m and the battery 1 described above is that in battery 1m, the second layer 500 is fixed within the first region 2011 of the first surface 201, i.e., located outside the second region 2011. In this embodiment, the first distance L1 is greater than the second distance L2, i.e., the second side 214 is located to the left of the first surface 201 as shown in Figure 13. The first layer 400 is provided at the boundary between the first region 2011 and the second region 2012, with a portion fixed to the first region 2011 and the other portion fixed to the second region 2012. The second layer 500 is fixed to the first region 2011 and has a gap between it and the first layer 400.

[0061] In the battery 1 provided in the first embodiment, if subjected to a strong impact, the second layer 500 may tear a local portion of the first current collector below it, and since the side of the first current collector facing the first edge 213 is coated with active material, there is a risk that the active material of the electrode assembly 200 may fall off. In contrast, in the battery 1m provided in this embodiment, even if the second layer 500 tears the fluid collector below it when subjected to a strong impact, the active material will not fall off because the active material is not coated on both sides of the first fluid collector below the second layer 500, thereby further reducing the risk and ultimately eliminating the risk. Furthermore, other embodiments of the present application can be adaptively adjusted thereon. For example, the second layer 500 is still provided in the first region 2011, but the first distance L1 is smaller than the second distance L2.

[0062] Furthermore, for example, Figure 25 shows a schematic view of a battery 1n provided by the twelfth embodiment of the present application, as seen along the first direction Z after the housing has been concealed. This battery 1n includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400, and a second layer 500. The main difference between this battery 1n and the battery 1 described above is that in battery n, a portion of the second layer 500 is fixed to the first region 2011, and the other portion of the second layer 500 is fixed to the second region 2012.

[0063] Compared to the first embodiment, in the battery 1n provided by the second embodiment, even when the width of the second layer 500 is approximately the same, air bubbles present during the fixing process of the second layer 500 can be relatively easily removed. That is, in addition to being less prone to retaining air bubbles, the second layer 500 can provide a larger bonding area, which is advantageous in strengthening the fixing strength between the electrode assembly 200 and the housing.

[0064] Furthermore, for example, Figure 26 shows a schematic diagram of the battery 1u provided in Comparative Example 1 of the present application along the first direction Z after concealing the housing 100, and Figure 27 shows a bottom view of Figure 26. Referring in conjunction with Figures 1 to 21, this battery 1u includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400', and a second layer 500, the main difference from the battery 1 provided in the first embodiment being that the second layer 500 in this battery 1u is provided on the second surface 202. Specifically, the first layer 400' is provided at the boundary between the first region 2011 and the second region 2012, and is used to secure only the first end 212, rather than securing the electrode assembly 200 and the housing. For example, in some embodiments, the first layer 400' may be single-sided rubber. The second layer 500 is specifically provided on the second surface 2014 to secure the electrode assembly 200 and the housing. The selection of the second layer 500 is also consistent in each embodiment, and the second layer 500 may be any element that can be used to connect the electrode assembly 200 and the housing, such as double-sided tape or hot melt adhesive. Optionally, the battery 1u may include two second layers 500. Both of these second layers 500 are provided on the second surface 2014 and are spaced apart along the third direction Y.

[0065] In this embodiment, the battery 1u is fixed at the first end 212 by a first layer 400', and the electrode assembly 200 and housing are fixed by two second layers 500. Compared to battery 1, battery 1u requires three rubber layers to achieve the same fixing area as battery 1. This increases the manufacturing cost and lengthens the manufacturing cycle. Furthermore, the chemical process imposes pressure on the housing and electrode assembly, and one minute corrugated protrusion is added to the housing for each additional rubber layer. In other words, battery 1u forms a more pronounced corrugated deformation on the housing surface than battery 1, affecting the battery's conformability and fall prevention effect.

[0066] Furthermore, for example, Figure 28 shows a schematic diagram of the battery 1v provided by Comparative Example 2 of the present application after the housing 100 has been concealed, and Figure 29 shows a bottom view of Figure 28. Referring in conjunction with Figures 1 to 25, this battery 1v includes a housing, an electrode assembly 200, a conductive plate 300, a first layer 400'' and a second layer 500, and the main difference from the battery 1u provided by the first comparative example is that each second layer 500 in battery 1v is integrally arranged. As can be seen from above, the integral arrangement of each second layer 500 can simplify the fixing process of the second layer 500 and shorten the manufacturing cycle of battery 1v, but it is more likely to leave more air bubbles and further reduces the fixing strength between the second layer 500 and the electrode assembly 200.

[0067] Next, we will explain the differences in the battery drop prevention performance and deformation prevention performance provided in each embodiment, along with the test data.

[0068] Specifically, please refer to Table 1, which shows a test comparison table of the battery drop prevention performance provided by each embodiment. For the sake of explanation, the above-mentioned first to twelfth embodiments will be referred to as Embodiments 1 to 12, respectively, and the above-mentioned first comparative example and second comparative example will be referred to as Comparative Example 1 and Comparative Example 2, respectively. The purpose of this test is to determine the battery drop prevention performance by simulating battery failure due to dropping during normal use. The test method is as follows.

[0069] In the S101, the battery is charged to its limit voltage at room temperature with a current of 0.2C. Here, the "limit voltage" is set by the battery manufacturer and is the maximum voltage value at which the battery transitions from constant current charging to constant voltage charging; it may vary depending on the battery specifications and changes by the manufacturer.

[0070] In S102, a drop test is performed on the battery using a drop test device specifically designed for batteries. Specifically, first, the robotic arm of the drop test device grasps the battery sample and lifts it to 1.8 meters (m) from the Dali slate, controlling it so that the first surface 2013 of the electrode assembly 200 of the battery faces downwards when the battery is released. Next, the robotic arm grasps the battery sample and lifts it to 1.8 m from the marble plate, controlling it so that the second surface 2014 of the electrode assembly 200 faces downwards when the battery is released. After that, the robotic arm grasps the battery sample and lifts it to 1.8 m from the marble plate, controlling it so that the top of the battery faces downwards when the battery is released. After that, the robotic arm grasps the battery sample and lifts it to 1.8 m from the marble plate, controlling it so that the bottom of the battery faces downwards when the battery is released. Next, the robotic arm grasps the battery sample and lifts it to 1.8 m from the Dali slate, controlling it so that the third surface 2015 of the electrode assembly 200 faces downwards when the battery is released. Finally, the robotic arm grasps the battery sample, lifts it 1.8m from the marble plate, and controls it to release the battery with the fourth surface 2016 of the electrode assembly 200 facing downwards.

[0071] In S103, the system determines whether the battery is faulty. Specifically, it observes whether the battery surface is damaged and measures the open-circuit voltage of the battery. If damage occurs on the battery surface and / or the open-circuit voltage of the battery is less than 3.0 volts (V), the battery is determined to be faulty. Otherwise, the battery is not faulty.

[0072] In step S104, if the battery is not faulty, repeat steps S102 to S103.

[0073] In S105, if the battery fails, the test is stopped. The number of times the sample battery performs step S2 is tallied, and the sample battery is disassembled to observe whether the electrode assembly 200 fails in the first layer 400 and / or the second layer 500.

[0074] In this example, to avoid the randomness of test results from a single battery, each test was conducted using five batteries.

[0075] As shown in Table 1, the second layer 500 in the batteries provided by Comparative Examples 1 and 2 can serve to fix the electrode assembly 200 to the housing, but in the region where the second layer 500 is provided, the first electrode sheet 500 still has active material on the side facing the center where the electrode assembly 200 is wound. The fluid collection of the electrode sheet is torn apart as the battery falls, and further active material falls out, causing a decrease in battery performance.

[0076] In the battery 1 provided in Example 1, the first layer 400 and the second layer 500 are arranged on the first surface 201 and are arranged independently. This makes it easier to expel air bubbles during the process of fixing the first layer 400 and the second layer 500 to the electrode assembly 200, resulting in fewer air bubbles remaining in the covering area. Both the first layer 400 and the second layer 500 are in close contact with the electrode assembly 200, ensuring a good fixing effect between the electrode assembly 200 and the housing. Therefore, the fall prevention effect of the battery 1 provided in Example 1 is superior to that of Comparative Examples 1 and 2.

[0077] The battery 1b provided in Example 2 further includes a third layer 600 compared to battery 1. The arrangement of the third layer 600 can improve the flatness of the electrode assembly 200 to some extent, restrain the electrode assembly 200 so that it is less likely to loosen, and further reduce the risk of perforation of the housing due to slight loosening of the electrode assembly 200.

[0078] In the battery 1c provided in Example 3, compared to battery 1b, at least one of the first layer 400 or the second layer 500 within the battery 1c is bonded and fixed to the third layer 600, thereby enhancing the effect of fixing the third layer 600.

[0079] In the battery 1d provided in Example 4, compared to battery 1b, at least one of the first layer 400 or the second layer 500 is bonded and fixed to the third layer 600, thus enhancing the effect of fixing the third layer 600. At the same time, the length of the first layer 400 is greater than that of the second layer 500, which further improves the stability of the electrode assembly 200 itself and is advantageous in improving the effect of preventing the battery from falling out.

[0080] The battery 1e provided in Example 5, compared to battery 1, further includes a third layer 600, and at least one of the first layer 400 or the second layer 500 is bonded and fixed to the third layer 600, thereby enhancing the effect of fixing the electrode assembly 200.

[0081] The battery 1f provided in Example 6 has the following advantages over battery 1: on the one hand, the first end 212 is made longer to facilitate the installation of the second layer 500 in the first region 2011, thereby reducing the risk of active material detachment; on the other hand, it further includes a third layer 600, and at least one of the first layer 400 or the second layer 500 is bonded and fixed to the third layer 600, thereby enhancing the effect of fixing the electrode assembly 200. Therefore, the battery 1f has superior fall prevention performance.

[0082] The battery 1g provided in Example 7 has a first layer 400 and a second layer 500 arranged on the first surface 201, and the two are arranged integrally. That is, the first layer 400 has a larger area, while the second layer 500 is not provided on the second surface 202. As a result, the contact between the electrode assembly 200 and the housing is tighter. Therefore, the fall prevention effect of the battery 1g provided in Example 7 is superior to that of Comparative Examples 1 and 2.

[0083] As described above, by placing the first layer 400 and the second layer 500 on the first surface 2013, good battery fall prevention performance is maintained, and furthermore, the installation of the third layer 600 can further improve battery fall prevention performance.

[0084] [Table 1]

[0085] Refer to Table 2 again. Figure 2 is a comparison table of the degree of battery deformation tests provided by each embodiment. The purpose of this test is to determine the deformation prevention performance of the battery by simulating the degree of deformation after the battery has been recharged multiple times during the process of daily use. The specific steps of the deformation degree test are as follows: In S201, the battery is charged to a fully charged state with a current of 0.2C at room temperature.

[0086] In S202, the battery is discharged to the off voltage, and then charged to the limit voltage with a constant current and voltage of 0.8C.

[0087] In S203, the first thickness t1 of the battery at the conductive plate position is measured and recorded. A preset pressure is applied to the battery through a PPG soft pack battery thickness measuring instrument, and the second thickness t2 of the battery at that preset pressure is measured and recorded. The first thickness difference Δt is calculated, and this Δt is a quantization index of the degree of deformation of the battery. Here, Δt = t2 - t1.

[0088] In S204, step S202 is repeated 700 times.

[0089] In S205, the third thickness T1 of the battery at the conductive plate position is measured and recorded. A preset pressure is applied to the battery through a PPG soft pack battery thickness measuring instrument, and the fourth thickness T2 of the battery at that preset pressure is measured and recorded. The second thickness difference ΔT is calculated. This ΔT is a quantization index of the degree of deformation of the battery. Here, ΔT = T2 - T1.

[0090] As shown in Table 2, the second layer 500 in the batteries provided by Comparative Example 1 and Comparative Example 2 can serve to fix the electrode assembly 200 to the housing. However, since the first layer 400 and the second layer 500 are located on both sides of the electrode assembly Δt along the first direction of the battery, corrugated bumps exist on both surfaces of the battery that are positioned opposite each other along the first direction. As a result, the first thickness difference Δt and the second thickness difference ΔT of the battery before and after charging and discharging are large. In other words, the degree of deformation of the batteries provided by Comparative Example 1 and Comparative Example 2 is clear.

[0091] In the battery 1 provided in Example 1, the first layer 400 and the second layer 500 are arranged on the same surface of the electrode assembly 200, and are arranged independently of each other. In this way, the corrugated bumps that cause the battery to separate along the first direction Z from one surface of the first layer 400 can be reduced or eliminated, while the number of air bubbles between each of the first layer 400 and the second layer 500 and the electrode assembly 200 is reduced, resulting in a higher connection strength between the electrode assembly 200 and the housing than in Example 7, and thus reducing the degree of deformation of the battery 1. Furthermore, from the data in Table 2, it can be seen that the deformation resistance of battery 1u and battery 1v has been significantly improved in battery 1.

[0092] The batteries provided in Examples 2 to 6 all have a third layer 600 added to battery 1, and have superior deformation resistance compared to battery 1 provided in Example 1. Specifically, the placement of the third layer 600 is constrained to minimize variations in the electrode assembly 200, thereby ensuring the flatness of each part of the electrode assembly 200. This reduces the degree of deformation of the battery due to local deformation of the electrode assembly 200 during charging. In battery 1g provided in Example 7, since the second layer 500 is not installed on the second surface 2014, the battery mainly has waveform protrusions in the region close to the first surface 2013, and the waveform protrusions in the region close to the second surface 2014 are correspondingly reduced, and eventually disappear. Therefore, the first thickness difference Δt and the second thickness difference ΔT before and after charging and discharging of battery 1g provided in Example 7 are both smaller than those of the batteries provided in Comparative Examples 1 and 2. In other words, battery 1g provided in Example 7 has better deformation resistance than Comparative Examples 1 and 2.

[0093] As described above, by providing the first layer 400 and the second layer 500 on the same side of the electrode assembly 200 in the first direction, i.e., the first surface 2013, it is possible to ensure that the battery has good deformation resistance. At the same time, this does not cause a decrease in energy density. On the other hand, the deformation resistance of the battery can be further improved by installing the third layer 600.

[0094] [Table 2]

[0095] This application also provides an electronic device based on the same invention concept. Specifically, Figure 30 shows a schematic diagram of an electronic device 2 provided by one embodiment of this application. At the same time, as can be seen from Figures 1 to 25, the electronic device 2 is equipped with a battery as described in any embodiment. In this embodiment, the electronic device 2 is a mobile phone. In other embodiments of this application, the electronic device 2 may be other electronic devices requiring electrical drive, such as a tablet, computer, or drone.

[0096] Because the aforementioned battery is included, the electronic device 2 can reduce the risk of the electrode assembly slipping against the housing when dropped.

[0097] While preferred embodiments of the present application are shown in the specification and drawings, the present application is not limited to the embodiments described herein and can be realized in many different forms. These embodiments are not intended to be additional limitations on the content of the present application, but rather to provide a more complete and thorough understanding of the disclosure. Furthermore, various other embodiments formed by combining the above technical features are all considered to be within the scope of disclosure in the present specification. In addition, those skilled in the art can make improvements or modifications in accordance with the above description. These improvements and modifications should all fall within the scope of protection of the claims attached to the present application.

Claims

1. It is a battery, It comprises a housing, an electrode assembly, a first layer, and a second layer. The electrode assembly includes a first electrode sheet, a second electrode sheet, and a separator film provided between the first electrode sheet and the second electrode sheet, which are housed in the housing and arranged in a stacked manner. The electrode assembly is provided to be wound up, The first electrode sheet has a first side and a second side facing each other along the winding direction, and a first end end that is separated from the first side. Looking along the first direction, The electrode assembly has a first surface, The first end is located on the first surface, The first end portion is a portion of the first electrode sheet that extends a predetermined distance from the second side along the winding direction of the electrode assembly. The second edge is located on the first surface and divides the first surface into a first region and a second region. The first region is the region where the first end is located, The first direction is perpendicular to the surface of the first layer, The first layer is fixed to the first region and the second region, and covers at least a portion of the second edge, The second layer is fixed to the first surface within the second region and has a gap between it and the first layer. The first and second layers are both double-sided tapes comprising a base layer and adhesive layers applied to both sides of the base layer. The first and second layers are used to fix the electrode assembly to the housing. The second layer is fixed within the second region, When viewed along the first direction, the first region has a first edge line positioned opposite the second side, and the distance between the first edge line and the second side is defined as the first distance. The second region has a second edge line positioned opposite the second side, and the distance between the second edge line and the second side is defined as the second distance. A battery characterized in that the first distance is smaller than the second distance.

2. A battery, It comprises a housing, an electrode assembly, a first layer, and a second layer. The electrode assembly includes a first electrode sheet, a second electrode sheet, and a separator film provided between the first electrode sheet and the second electrode sheet, which are housed in the housing and arranged in a stacked manner. The electrode assembly is provided to be wound up, The first electrode sheet has a first side and a second side facing each other along the winding direction, and a first end end that is separated from the first side. Looking along the first direction, The electrode assembly has a first surface, The first end is located on the first surface, The first end portion is a portion of the first electrode sheet that extends a predetermined distance from the second side along the winding direction of the electrode assembly. The second edge is located on the first surface and divides the first surface into a first region and a second region. The first region is the region where the first end is located, The first direction is perpendicular to the surface of the first layer, The first layer is fixed to the first region and the second region, and covers at least a portion of the second edge, The second layer is fixed to the first surface within the second region and has a gap between it and the first layer. The first and second layers are both double-sided tapes comprising a base layer and adhesive layers applied to both sides of the base layer. The first and second layers are used to fix the electrode assembly to the housing. The second layer is fixed within the first region, When viewed along the first direction, the first region has a first edge line positioned opposite the second side, and the distance between the first edge line and the second side is defined as the first distance. The second region has a second edge line positioned opposite the second side, and the distance between the second edge line and the second side is defined as the second distance. A battery characterized in that the first distance is greater than the second distance.

3. Along the second direction, the length of the first layer is greater than the length of the second layer. The battery according to claim 1 or 2, characterized in that the second direction is the direction in which the second side extends.

4. Along the second direction, at least one end of the first layer is located outside both ends of the second layer, The battery according to claim 1 or 2, characterized in that the second direction is the direction in which the second side extends.

5. Along the third direction, the width of the first layer is greater than the width of the second layer. The battery according to claim 3, characterized in that the third direction is simultaneously perpendicular to the first and second directions.

6. Along the third direction, the width of the first layer is greater than the width of the second layer, The battery according to claim 4, characterized in that the third direction is simultaneously perpendicular to the first and second directions.

7. The battery according to claim 1 or 2, characterized in that the first layer is rectangular, and when the angle between the long side and the second side of the first layer is θ, 0° < θ < 15°.

8. The outer surface of the electrode assembly has a first surface and a second surface that are opposite to each other along the first direction, and a third surface and a fourth surface that are opposite to each other along the third direction. When viewed along the second direction, both the first and second surfaces extend along the third direction and are located between the first reference line and the second reference line. The third surface extends in a curved manner and is located on the side of the second reference line that is separated from the first reference line. The fourth surface extends in a curved manner and is located on the side of the first reference line that is separated from the second reference line. The first surface, the third surface, the second surface, and the fourth surface are connected to each other in sequence. Viewed along the first direction, the first surface includes at least a portion of the first surface, a portion of the third surface, and a portion of the fourth surface, and the second edge is located on the first surface. The first layer and / or the second layer are provided on the first surface, The second direction is the direction in which the second edge extends, The third direction is simultaneously perpendicular to the first and second directions. Viewed along the second direction, the first point is defined as the outermost point along the third direction at the first corner of the first electrode sheet, starting from the first edge. The first reference line is parallel to the first direction and passes through the first point. In the first electrode sheet, the second point is defined as the outermost point along the third direction at the second corner starting from the first edge. The battery according to claim 1 or 2, characterized in that the second reference line is parallel to the first direction and passes through the second point.

9. Furthermore, it is equipped with a third layer, The battery according to claim 8, characterized in that the first end of the third layer is fixed to the first surface and the second end of the third layer is fixed to the second surface.

10. At least one first end of the third layer is fixed to the first layer, and / or At least one first end of the third layer is fixed to the second layer, and / or The battery according to claim 9, characterized in that at least one first end of the third layer is simultaneously fixed to the first layer and the second layer.

11. The first electrode sheet is wound up to form a plurality of first parts and a plurality of second parts. The second electrode sheet has a third side and a fourth side arranged opposite to each other along the winding direction, is wound around the third side, and has a second end that is away from the third side, the second end being a portion formed by extending the second electrode sheet a predetermined distance from the fourth side along the winding direction, and is provided between two adjacent first parts or between two adjacent second parts. Along the winding direction, the first electrode sheet extends beyond the second end. The battery according to claim 1 or 2, characterized in that the first or second portion of the first electrode sheet that is adjacent to the second end and located on the side of the second end that is close to the first edge does not have an active material layer on the side opposite to the first edge in the portion from just beyond the second end to the second edge.

12. An electronic device characterized by comprising the battery described in claim 1 or 2.

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