battery

Abstract

A battery includes an electrode assembly, a first insulating layer, a second insulating layer, and a first adhesive portion. The electrode assembly includes a first surface and a second surface disposed opposite the first surface; the first insulating layer is disposed on the first surface; the second insulating layer is disposed on the first surface and spaced apart from the first insulating layer in a first direction; and the first adhesive portion is disposed on the first surface and located in a region between the first insulating layer and the second insulating layer. The battery of the present application is advantageous in improving impact resistance.

Description

[0001] This application is a divisional application of application No. 202010246220.8, titled "Battery", with a filing date of March 31, 2020. TECHNICAL FIELD

[0002] The present application relates to a battery. BACKGROUND

[0003] With the mature application of consumer electronics, electric vehicles and the like, customers pay more and more attention to the risks of the whole machine application. For example, the requirement for the impact resistance of electronic products is getting higher and higher. As an important part of electronic products, the battery also has requirements for impact resistance. When the electronic product is impacted, the electrode assembly contained in the battery shell is easy to damage the shell, or the electrode assembly itself is damaged due to impact, thereby affecting the safety and service life of the battery. SUMMARY

[0004] In view of the above, it is necessary to provide a battery which is beneficial to improve the impact resistance and thus improve the safety.

[0005] The present application provides a battery, comprising:

[0006] An electrode assembly, comprising an outer surface, the outer surface comprising a first surface and a second surface disposed opposite to the first surface;

[0007] A first insulating layer disposed on the first surface;

[0008] A second insulating layer disposed on the first surface and spaced apart from the first insulating layer along a first direction, the first direction being parallel to the first surface; and

[0009] A first adhesive portion, wherein the first adhesive portion is disposed on the first surface and located in a region between the first insulating layer and the second insulating layer;

[0010] The battery further comprises a third adhesive portion, the third adhesive portion is disposed on the surface of the first insulating layer away from the second surface and extends to the region of the first surface where the first insulating layer is not disposed;

[0011] The battery further comprises a shell, the shell wrapping the electrode assembly, the first insulating layer and the second insulating layer, and being adhered to the electrode assembly through the first adhesive portion.

[0012] As an aspect of the present application, the area of the first adhesive portion in the orthographic projection of the first surface is less than the total area of the first insulating layer and the second insulating layer in the orthographic projection of the first surface.

[0013] As an aspect of the present application, the first adhesive portion has an area smaller than the area of the first insulating layer in the first surface, and smaller than the area of the second insulating layer in the first surface.

[0014] As an aspect of the present application, the first surface has a distance to the second surface in the area overlapping the first insulating layer, and the first adhesive portion has a distance to the second surface, the distance of the first surface being smaller than the distance of the first adhesive portion.

[0015] As an aspect of the present application, the distance of the first surface is the distance of the first surface to the second surface at the end corresponding to the first insulating layer.

[0016] As an aspect of the present application, the first surface has a distance to the second surface in the area overlapping the second insulating layer, the distance being smaller than the distance of the first adhesive portion.

[0017] As an aspect of the present application, the distance of the first surface is the distance of the first surface to the second surface at the end corresponding to the second insulating layer.

[0018] As an aspect of the present application, the distance of the first surface is not equal to the distance of the first surface.

[0019] As an aspect of the present application, the first adhesive portion has a length in the first direction smaller than half of the length of the first surface in the first direction.

[0020] As an aspect of the present application, the first surface has a first recess corresponding to the first adhesive portion, and the first adhesive portion is located in the first recess.

[0021] As an aspect of the present application, the first adhesive portion has two or more, and each first adhesive portion is located in a first recess.

[0022] As an aspect of the present application, the battery further comprises a second adhesive portion, the second adhesive portion is provided on the surface of the first insulating layer facing away from the second surface, and the second adhesive portion has an area smaller than the area of the first insulating layer in the first surface.

[0023] As an aspect of the present application, the first adhesive portion is distributed in a lattice, and / or the second adhesive portion is distributed in a lattice.

[0024] As an aspect of the present application, the first insulating layer has a second recess corresponding to the second adhesive portion, and each second adhesive portion is located in the second recess.

[0025] As an aspect of the present application, the electrode assembly further includes a connection region connecting the first surface and the second surface, the first insulating layer extends from the first surface to the connection region, and the second insulating layer extends from the first surface to the connection region.

[0026] As an aspect of the present application, the first insulating layer and the second insulating layer are located on the same side of the electrode assembly.

[0027] As an aspect of the present application, the electrode assembly further includes a metal portion, the connection region includes a first portion and a second portion opposite to the first portion, the metal portion is disposed on the first portion, and the first insulating layer and the second insulating layer extend to the second portion.

[0028] As an aspect of the present application, the battery further includes a fourth adhesive portion, the fourth adhesive portion is disposed on the first surface, a region of the first surface provided with the fourth adhesive portion is spaced apart from a region of the first surface provided with the first insulating layer and the second insulating layer and a region of the first surface located between the first insulating layer and the second insulating layer, and the fourth adhesive portion does not contact the first insulating layer and the second insulating layer.

[0029] As an aspect of the present application, the electrode assembly includes at least two fourth adhesive portions with different shapes as viewed in a direction perpendicular to the first surface.

[0030] As an aspect of the present application, the electrode assembly further includes a third insulating layer, the electrode assembly has a wound structure, and the third insulating layer is disposed on the second surface and fixes an end portion of an outermost coil tab of the electrode assembly.

[0031] As an aspect of the present application, the housing is bonded to the electrode assembly by a third adhesive portion.

[0032] The battery of the present application has the first insulating layer and the second insulating layer disposed on the surface of the electrode assembly and the first adhesive portion disposed between the first insulating layer and the second insulating layer, and when the housing encapsulates the electrode assembly, the first adhesive portion bonds the electrode assembly and the housing, which is beneficial to improve the safety of the battery and prolong the service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Structure diagram of the battery of an embodiment of the present application.

[0034] Figure 2 Structure diagram of the battery of an embodiment of the present application.

[0035] Figure 3 Structure diagram of the stack of an embodiment of the present application.

[0036] Figure 4 Structure diagram of the first conductive layer of an embodiment of the present application.

[0037] Figure 5 A schematic view of a structure of a second conductive layer according to an embodiment of the present application.

[0038] Figure 6 A schematic view of a structure of an electrode assembly according to an embodiment of the present application.

[0039] Figure 7 A schematic view of a structure of an electrode assembly according to an embodiment of the present application.

[0040] Figure 8 A schematic view of a structure of a battery according to an embodiment of the present application.

[0041] Figure 9 A front view of a battery according to an embodiment of the present application.

[0042] Figure 10 A schematic view of a cross section of a battery according to an embodiment of the present application in a first direction.

[0043] Figure 11 A schematic view of a cross section of a battery according to an embodiment of the present application in a second direction.

[0044] Figure 12 A schematic view of a cross section of a battery according to an embodiment of the present application in a first direction.

[0045] Figure 13 A schematic view of a cross section of a battery according to an embodiment of the present application in a first direction.

[0046] Figure 14 A schematic view of a structure of a first adhesive portion or a fourth adhesive portion according to an embodiment of the present application.

[0047] Figure 15 A schematic view of a structure of a first adhesive portion or a fourth adhesive portion according to an embodiment of the present application.

[0048] Figure 16 A schematic view of a structure of a first adhesive portion or a fourth adhesive portion according to an embodiment of the present application.

[0049] Figure 17 A schematic view of a structure of a first adhesive portion or a fourth adhesive portion according to an embodiment of the present application.

[0050] Figure 18 A schematic view of a structure of a battery according to an embodiment of the present application.

[0051] Figure 19 A schematic view of a partially exploded battery according to an embodiment of the present application.

[0052] Figure 20 A schematic view of a cross section of a battery according to an embodiment of the present application in a second direction.

[0053] Figure 21 A partial cross-sectional view of a battery according to an embodiment of the present application in a second direction.

[0054] Figure 22 A side view of a battery according to an embodiment of the present application.

[0055] Figure 23 A rear view of a battery according to an embodiment of the present application.

[0056] Figure 24 A bottom view of a battery according to an embodiment of the present application.

[0057] Figure 25 A schematic view of a structure of a battery according to an embodiment of the present application.

[0058] Figure 26 A schematic view of a structure of a battery according to an embodiment of the present application.

[0059] Figure 27 A bottom view of a battery according to an embodiment of the present application.

[0060] Figure 28 A schematic view of a partial structure of a battery according to Comparative Example 2 in the present application.

[0061] Figure 29 A schematic view of a partial structure of a battery according to Comparative Example 3 in the present application.

[0062] Figure 30 A schematic view of a partial structure of a battery according to Example 1 in the present application.

[0063] Figure 31 A schematic view of a partial structure of a battery according to Example 2 in the present application.

[0064] Figure 32 A schematic view of a partial structure of a battery according to Example 3 in the present application.

[0065] Figure 33 A schematic view of a partial structure of a battery according to Example 4 in the present application.

[0066] Figure 34 A schematic view of a structure of a battery according to an embodiment of the present application.

[0067] Explanation of Main Element Symbols

[0068]

[0069]

[0070]

[0071] The following detailed description will further describe the present application with reference to the above figures. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be described clearly and in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0073] Hereinafter, the embodiments of the present application will be described in detail. However, the present application can be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that the present application will be thorough and complete, and fully convey the scope of the present application to those skilled in the art.

[0074] In addition, for the sake of brevity and clarity, in the drawings, the size or thickness of various components, layers, or regions can be exaggerated. Throughout the document, the same numerical references refer to the same elements. As used herein, the terms "and / or", "at least one of", and "one or more of" include any and all combinations of one or more of the associated listed items. In addition, it should be understood that if an element A is referred to as being "connected" to element B, element A can be directly connected to element B or intervening elements C can be present and element A and element B can be indirectly connected to each other through the intervening elements C.

[0075] Further, use of "may" when describing embodiments of the present application means that one or more embodiments of the present application.

[0076] The professional terms used herein are for the purpose of describing the specific embodiments and are not intended to limit the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It should be further understood that the term "comprising" when used in this specification, means that the stated features, numbers, steps, operations, elements, and / or components are present, but does not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and / or combinations thereof.

[0077] Spatially relative terms, such as "on", "above", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device is inverted in the figure, a

[0078] Some embodiments of the present application are described in detail below. The following examples and embodiments described below can be combined with each other in the case of no conflict.

[0079] Referring to Figure 1 , the battery 100 includes an electrode assembly 10, a first insulating layer 20, a second insulating layer 30, and a first adhesive portion 40.

[0080] Referring to Figure 1 , the electrode assembly 10 includes a first surface 101, a second surface 103 disposed opposite the first surface 101, and a connection region 105 connecting the first surface 101 and the second surface 103.

[0081] Referring to Figure 1 , the electrode assembly 10 includes a tab 11 and a separator (not shown), and is wound by the tab 11 and the separator to have a wound structure. The first surface 101, the second surface 103, and the connection region 105 are a part of an outer surface of the electrode assembly 10.

[0082] For example, as shown in Figure 1 , the electrode assembly 10 is wound several times to have a structure, and at this time, the electrode assembly 10 has a plurality of bending portions in one direction, i.e., an X direction in the figure, and the plurality of bending portions are respectively distributed on opposite sides of a center of the battery 100 in the X direction, and Figure 1The first end 101A is an end of the outer plane of the electrode assembly 10 closest to the center of the battery 100, and the second end 101B is an end of the outer plane of the electrode assembly 10 closest to the center of the battery 100.

[0083] In the present embodiment, the first surface 101 is, for example, a surface of the electrode assembly 10 closest to the center of the battery 100. Figure 1 As viewed in the Z direction as shown, the first end 101A, the second end 101B, and the region surrounded by the first edge 16 and the second edge 18 of the electrode assembly 10 in the Y direction.

[0084] For example, for the electrode assembly 10 in a stack in which the tab 11 and the separator film are stacked in the Z direction, the electrode assembly 10 includes four edges perpendicular to the Z direction, and the region surrounded by the four edges is the second surface 103.

[0085] The electrode assembly 10 will be further described below with an example.

[0086] Referring to FIG. 1, the battery assembly 10 can include a first conductive layer 10A, a first insulating layer 10B, a second conductive layer 10C, and a second insulating layer 10D. Figure 3 The first insulating layer 10B is formed on a surface 10a of the first conductive layer 10A. The second conductive layer 10C is formed on a surface 10b of the first insulating layer 10B facing away from the first conductive layer 10A. The second insulating layer 10D is formed on a surface 10c of the second conductive layer 10C facing away from the first insulating layer 10B. Thus, a stack 10E can be formed, and the electrode assembly 10 can be formed based on the stack 10E.

[0087] Referring to FIG. 1, the battery assembly 10 can include a first conductive layer 10A, a first insulating layer 10B, a second conductive layer 10C, and a second insulating layer 10D. Figure 3 Figure 4 As viewed in a direction perpendicular to the surface 10a, the first conductive layer 10A can be, for example, rectangular. The first conductive layer 10A can be formed, for example, by stacking a current collector 10AA and an active material layer 10AB with each other. The current collector 10AA can include, for example, at least one of but not limited to an aluminum mesh, an aluminum foil, and the like. The active material layer 10AB can include, for example, at least one of but not limited to lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganese oxide, lithium nickel oxide, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadium oxyphosphate, lithium iron phosphate, lithium titanate, and a lithium-rich manganese-based material. The first conductive layer 10A can serve as a positive electrode tab when the electrode assembly 10 is included in the battery 100.

[0088] Referring to FIG. 1, the battery assembly 10 can include a first conductive layer 10A, a first insulating layer 10B, a second conductive layer 10C, and a second insulating layer 10D. Figure 3 ​Viewed from a direction perpendicular to surface 10b, the first insulating layer 10B may, for example, be rectangular. The first insulating layer 10B may, for example, be at least one or more of polyethylene, polypropylene, polyethylene terephthalate, polyimide, and aramid. The first insulating layer 10B may, for example, serve as a separator membrane when constituting the electrode assembly 10 of the battery 100.

[0089] Please see Figure 3 and Figure 5 Viewed from a direction perpendicular to surface 10c, the second conductive layer 10C may, for example, be rectangular. The second conductive layer 10C may, for example, be formed by stacking a current collector 10CA and an active material layer 10CB. The current collector 10CA may, for example, be at least one or more of conductive metal sheets such as nickel foil and copper foil. The active material layer 10CB may, for example, include at least, but is not limited to, one or more of graphite, soft carbon, hard carbon, graphene, mesophase carbon microspheres, silicon-based materials, tin-based materials, lithium titanate, or other metals capable of forming alloys with lithium. The second conductive layer 10C may, for example, serve as a negative electrode in the electrode assembly 10 constituting the battery 100.

[0090] Viewed from a direction perpendicular to surface 10b, the second separator 10D may, for example, be rectangular. The second separator 10D may, for example, be at least one or more of polyethylene, polypropylene, polyethylene terephthalate, polyimide, and aramid. The second separator 10D may, for example, serve as a separator membrane when constituting the electrode assembly 10 of the battery 100.

[0091] Please see Figure 6 The electrode assembly 10, for example, can be formed by winding a stack 10Ea consisting of multiple stacked bodies 10E. Or, for example, see [link to documentation]. Figure 7 The electrode assembly 10 can be formed by directly stacking multiple stacked bodies 10E.

[0092] In this embodiment, the outer surface of the electrode assembly 10 includes a first surface 101 and a second surface 103 facing away from the first surface 101. Furthermore, the outer surface of the electrode assembly 10 also includes a connection region 105 perpendicular to the first surface 101 in a third direction Z.

[0093] In this embodiment, the second surface 103 is, for example, in Figure 1 When viewed in the Z direction as shown, the area in the electrode assembly 10 that is opposite to the first surface 101 corresponds to the area enclosed by the first end 101A, the second end 101B, and the two ends of the electrode assembly 10 along the Y direction, namely the first side 16 and the second side 18.

[0094] Please see Figure 1 andFigure 8 The connection region 105 includes a first portion 106 and a second portion 107 opposite the first portion 106. The electrode assembly 10 can further include a metal portion 15 disposed at the first portion 106. One end of the metal portion 15 is connected to the tab 11, and the other end can be connected to other electronic components to enable electrical conduction between the electrode assembly 10 and the other electronic components.

[0095] The first insulating layer 20 and the second insulating layer 30 are disposed on the first surface 101, and the first insulating layer 20 and the second insulating layer 30 are spaced apart in a first direction X.

[0096] In the present embodiment, the first insulating layer 20, for example, can be rectangular as viewed in a third direction Z. The first insulating layer 20, for example, can include at least one or more of, but is not limited to, polyimide, polyvinyl chloride, polyethylene, and polypropylene. The second insulating layer 30, for example, can be rectangular as viewed in the third direction Z. The second insulating layer 30, for example, can include at least one or more of, but is not limited to, polyimide, polyvinyl chloride, polyethylene, and polypropylene.

[0097] The first surface 101 intersects the first edge 16 at the second portion 107. In some embodiments, the first direction X is a direction in which the first edge 16 is located. The first insulating layer 20 and the second insulating layer 30 each extend from the first edge 16 along the first surface 101 toward the first portion 106 and do not reach the first portion 106 as viewed in the third direction Z.

[0098] The length L1 by which the first insulating layer 20 extends from the first edge 16 toward the first portion 106 and the length L2 by which the second insulating layer 30 extends from the first edge 16 toward the first portion 106 are not particularly limited in the case where the first insulating layer 20 does not reach the first portion 106 and the second insulating layer 30 does not reach the first portion 106. In the present embodiment, the length L1 by which the first insulating layer 20 extends from the first edge 16 toward the first portion 106 is equal to the length L2 by which the second insulating layer 30 extends from the first edge 16 toward the first portion 106. Here, the above-described length direction is defined as a second direction Y.

[0099] The first insulating layer 20 and the second insulating layer 30 can each include a glue layer and a substrate disposed in layers, in which the glue layer bonds the substrate and the electrode assembly 10. The glue layer, for example, can include at least one or more of, but is not limited to, natural rubber, synthetic rubber, acrylate, silicone, ethylene-vinyl acetate. The substrate, for example, can include at least one or more of, but is not limited to, polyethylene, polypropylene, Teflon, polyvinyl chloride, polyimide, non-woven fabric.

[0100] Referring to Figure 1 , Figure 2 and Figure 9When viewed in the third direction Z perpendicular to the first surface 101, the first adhesive portion 40 is disposed on the first surface 101 and is located in a region 101a between the first insulating layer 20 and the second insulating layer 30. In the second direction Y, the first adhesive portion 40 does not extend beyond the first insulating layer 20 and the second insulating layer 30. In some embodiments, the length of the region 101a in the first direction X can be less than half the length of the first surface 101 in the first direction X.

[0101] In some embodiments, the area of the first adhesive portion 40 in the orthographic projection of the first surface 101, in other words, the area of the projection of the first adhesive portion 40 on the first surface 101 in the third direction Z perpendicular to the first surface 101, can be less than the total area of the orthographic projection of the first insulating layer 20 and the second insulating layer 30 on the first surface 101. Further, in some embodiments, the area of the first adhesive portion 40 in the orthographic projection of the first surface 101 can be less than the area of the orthographic projection of the first insulating layer 20 on the first surface 101 and simultaneously less than the area of the orthographic projection of the second insulating layer 30 on the first surface 101.

[0102] The first adhesive portion 40, for example, can include at least one of, but is not limited to, cellulose, polyvinylidene-co-hexafluoropropylene, polyvinylidene-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride or a mixture of any combination of the above polymers.

[0103] Referring to Figure 10 , the first distance H1 from at least a portion of the region where the first surface 101 overlaps the first insulating layer 20 to the second surface 103 is less than the second distance H2 from the first adhesive portion 40 to the second surface 103. In the case where the first distance H1 is ensured to be less than the second distance H2, the distance from different positions in the at least a portion of the region where the first surface 101 overlaps the first insulating layer 20 to the second surface 103 can be different. Further, referring to Figure 1 , Figure 9 and Figure 10 , here, the at least a portion of the region where the first edge 16 overlaps the first insulating layer 20 refers to the first distance H1 from the end of the first surface 101 corresponding to the first insulating layer 20 to the second surface 103 being less than the second distance H2 from the first adhesive portion 40 to the second surface 103.

[0104] In particular, referring to Figure 11The first surface 101 is provided with a first recess 120, which is arranged from the first edge 16 toward the first portion 106. At least a portion of the first insulating layer 20, which is away from the first portion 106, is arranged in the first recess 120. In this embodiment, the first recess 120 can be a sloping groove, the depth of which gradually decreases from the first edge 16 toward the first portion 106 along the second direction Y. The portion of the first insulating layer 20, which is close to the first portion 106, can be located outside the first recess 120.

[0105] Please refer to Figure 1 , Figure 9 and Figure 10 , the third distance H3 from the first surface 101 to the second surface 103 in at least a portion of the region where the first surface 101 overlaps with the second insulating layer 30 is less than the second distance H2. In the premise that the third distance H3 is less than the second distance H2, the distance from the first surface 101 to the second surface 103 in different positions in at least a portion of the region where the first surface 101 overlaps with the second insulating layer 20 can be different. Further, here, the at least a portion of the region where the first edge 16 overlaps with the second insulating layer 30 refers to the third distance H3 from the first surface 101 to the second surface 103 in at least a portion of the region where the first surface 101 overlaps with the second insulating layer 30.

[0106] Please refer to Figure 11 , the first surface 101 is provided with a second recess 130, which is arranged from the first edge 16 toward the first portion 106. At least a portion of the second insulating layer 30, which is away from the first portion 106, is arranged in the second recess 130. In this embodiment, the second recess 130 can be a sloping groove, the depth of which gradually decreases from the first edge 16 toward the first portion 106 along the second direction Y. The portion of the second insulating layer 30, which is close to the first portion 106, can be located outside the second recess 130.

[0107] In some embodiments, please refer to Figure 12 , the first distance H1 and the third distance H3 can be different.

[0108] Please refer to Figure 13 , the first surface 101 can be provided with a first groove 140, and the first adhesive portion 40 is located in the first groove 140. In this embodiment, the number of the first adhesive portions 40 is plural, and the number of the first grooves 140 is plural, and each first adhesive portion 40 is located in one first groove 140.

[0109] The shape of the first adhesive portion 40 is not limited when viewed from the third direction Z, which can be circular (please refer to Figure 9 ), rectangular (please refer to Figure 14 and Figure 15 ), strip-shaped (please refer to Figure 16) or a combination of these patterns. The number of the first adhesive portions 40 can also be set to one or more according to actual needs. When the number of the first adhesive portions 40 is more than one, the plurality of first adhesive portions 40 are arranged at intervals (for example, in a dot matrix distribution), and at least two first adhesive portions 40 with different shapes can be included in the battery 100 as viewed from the third direction Z (see Figure 17 ). In some embodiments, as viewed from the third direction Z, the shapes of all the first adhesive portions 40 can also be consistent. (see Figure 9 ).

[0110] Please refer to Figure 18 and Figure 19 , the battery 100 can also include a shell 80. The shell 80, for example, can be, but is not limited to, one or more of an aluminum-plastic film, a heat-shrinkable film, an aluminum shell, and a steel shell. The shell 80 wraps the electrode assembly 10, the first insulating layer 20, and the second insulating layer 30, and is adhered to the electrode assembly 10 through the first adhesive portions 40 (see Figure 20 ). The first adhesive portions 40 are arranged in the region 101a of the first insulating layer 20 and the second insulating layer 30, so that the region of the battery 100 in which the first insulating layer 20 and the second insulating layer 30 are arranged and the corresponding region 101a are more uniformly compressed in the horizontal direction, i.e., along the first direction X and the second direction Y, during the formation process, which is beneficial to reducing the degree of deformation of the battery 100 during use. Arranging the first adhesive portions 40 between the first insulating layer 20 and the second insulating layer 30 can increase the adhesion between the electrode assembly 10 and the shell 80, so as to inhibit the relative displacement between the electrode assembly 10 and the shell 80 when the battery 100 is subjected to external force, thereby reducing the possibility of damage to the battery 100 due to external force and prolonging the service life of the battery 100. At the same time, the deformation of the electrode assembly 10 is also inhibited due to the adhesion of the first adhesive portions 40 to the shell 80 and the electrode assembly 10. In addition, the shape of the first adhesive portions 40 can change after being adhered to the shell 80. When the number of the first adhesive portions 40 is more than one, the plurality of first adhesive portions 40 can be arranged at intervals or connected between adjacent first adhesive portions 40 after being adhered to the shell 80 (see Figure 16 ).

[0111] Please refer to Figure 1 , Figure 2 , Figure 9 and Figure 10The battery 100 can further include a second adhesive portion 50 disposed on the surface 21 of the first insulating layer 20 facing away from the second surface 103. The second adhesive portion 50 can have an area of a footprint on the first surface 101 that is less than an area of a footprint of the first insulating layer 20 on the first surface 101. The second adhesive portion 50 can also be disposed on the surface 31 of the second insulating layer 30 facing away from the second surface 103, in which case the second adhesive portion 50 can have an area of a footprint on the first surface 101 that is less than an area of a footprint of the second insulating layer 30 on the first surface 101.

[0112] The second adhesive portion 50 can include, for example, but is not limited to, at least one polymer selected from the group consisting of cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride, or a mixture of any combination of the above polymers.

[0113] The second adhesive portion 50 can have any shape, such as a circular shape, a rectangular shape, a strip shape, other regular or irregular shapes, or a combination of these shapes, when viewed from the third direction Z. The second adhesive portion 50 can be provided in one or more numbers, as desired. When the second adhesive portion 50 is provided in a plurality of numbers, the plurality of second adhesive portions 50 can be spaced apart (e.g., in a lattice pattern), and the battery 100 can include at least two second adhesive portions 50 having different shapes when viewed from the third direction Z. In some embodiments, all of the second adhesive portions 50 can have the same shape when viewed from the third direction Z.

[0114] In some embodiments, referring to Figure 13 , the surface of the first insulating layer 20 facing away from the second surface 103 can be provided with a second recess 150, and the second adhesive portion 50 can be disposed in the second recess 150.

[0115] In some embodiments, referring to Figure 18 and Figure 21 , the housing 80 can be adhered to the first insulating layer 20 via the second adhesive portion 50. The housing 80 can also be adhered to the second insulating layer 30 via the second adhesive portion 50. The housing 80 can also be adhered to both the first insulating layer 20 and the second insulating layer 30 via the second adhesive portion 50. When the second adhesive portion 50 is provided in a plurality of numbers, the plurality of second adhesive portions 50 can be spaced apart from each other after being adhered to the housing 80, or adjacent second adhesive portions 50 can be connected to each other.

[0116] In some embodiments, referring to Figure 1 ,Figure 2 and Figure 9 The battery 100 can further include a third adhesive portion 60 disposed on the surface 21 of the first insulating layer 20 facing away from the second surface 103 and extending to the first surface 101 across the interface of the first insulating layer 20 and the first surface 101.

[0117] The third adhesive portion 60, for example, can include at least one of, but is not limited to, cellulose, polyvinylidene-co-hexafluoropropylene, polyvinylidene-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride, or a mixture of any combination of the above polymers.

[0118] Referring to Figure 18 and Figure 21 The third adhesive portion 60 adheres to the case 80. The case 80 can be adhered to the first insulating layer 20 by the third adhesive portion 60. The case 80 can also be adhered to the second insulating layer 30 by the third adhesive portion 60. The case 80 can also be adhered to both the first insulating layer 20 and the second insulating layer 30 by the third adhesive portion 60.

[0119] Referring to Figure 1 , Figure 2 , Figure 9 and Figure 21 The battery 100 can further include a fourth adhesive portion 70 disposed on the region 101b of the first surface 101. The region 101b is spaced apart from the region 101a of the first surface 101 on which the first insulating layer 20 and the second insulating layer 30 are disposed, and the fourth adhesive portion 70 does not contact the first insulating layer 20 and the second insulating layer 30.

[0120] Specifically, referring to Figure 9 The region 101b includes a first block 101b1 and a second block 101b2. The first block 101b1 faces away from the region 101a in the second direction Y. The second block 101b2 is located on the side of the first insulating layer 20 facing away from the second insulating layer 30 and the side of the second insulating layer 30 facing away from the first insulating layer 20 in the first direction X. In the present embodiment, the fourth adhesive portion 70 is located on the first block 101b1 of the region 101b.

[0121] The fourth adhesive portion 70 can include, for example, but is not limited to, at least one polymer selected from the group consisting of cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, and polypropylene-maleic anhydride, or a mixture of any combination of the above polymers.

[0122] The fourth adhesive portion 70 can have any shape, such as a circular shape (see Figure 9 ), a rectangular shape (see Figure 14 ), a strip shape (see Figure 15 ), other regular or irregular shapes, or a combination of the above shapes, when viewed from the third direction Z. The fourth adhesive portion 70 can be provided in one or a plurality of numbers. When the fourth adhesive portion 70 is provided in a plurality of numbers, the plurality of fourth adhesive portions 70 can be spaced apart (e.g., arranged in a lattice pattern), and at least two fourth adhesive portions 70 having different shapes can be included in the battery 100 when viewed from the third direction Z (see Figure 16 ). In some embodiments, all of the fourth adhesive portions 70 can have the same shape when viewed from the third direction Z. Figure 17

[0123] The housing 80 can be adhered to the electrode assembly 10 by the fourth adhesive portion 70 (see Figure 18 and Figure 21 ). When the fourth adhesive portion 70 is provided in a plurality of numbers, the plurality of fourth adhesive portions 70 can be spaced apart after being adhered to the housing 80, or adjacent fourth adhesive portions 70 can be connected to each other (see Figure 16 ).

[0124] The housing 80 can be adhered to the electrode assembly 10 by the fourth adhesive portion 70 (see Figure 2 , Figure 21 and Figure 22 ., the first insulating layer 20 and the second insulating layer 30 also extend from the first surface 101 to the connecting area 105. In the embodiment, the first insulating layer 20 and the second insulating layer 30 extend from the first surface 101 to the second portion 107. Further, the first insulating layer 20 and the second insulating layer 30 can also extend from the second portion 107 to the second surface 103. The first insulating layer 20 and the second insulating layer 30 arranged on the first surface 101 can isolate the electrode assembly 10 and the case 80, thereby reducing the contact between the electrode assembly 10 and the case 80, lowering the possibility of the electrode assembly 10 damaging the case 80, and avoiding the active material falling from the area where the electrode assembly 10 combines with the first insulating layer 20 and the second insulating layer 30 causing the damage of the case. In addition, when the battery 100 falls, the first insulating layer 20 and the second insulating layer 30 can also buffer between the electrode assembly 10 and the case 80, reducing the possibility of the sharp part of the electrode assembly 10 surface impacting the case 80 causing the damage. When the first insulating layer 20 and the second insulating layer 30 extend to the second portion 107 or even the second surface 103, the first insulating layer 20 and the second insulating layer 30 can also play a role in fixing the electrode assembly 10, inhibiting the electrode assembly 10 from scattering.

[0125] Please refer to Figure 23 and 24 , the electrode assembly 10 can also include a third insulating layer 17 arranged on the second surface 103 and fixing the end of the outermost pole piece 11 of the electrode assembly 10.

[0126] In some embodiments, the positions where the first insulating layer 20 and the second insulating layer 30 are arranged are not limited to the above-mentioned cases. For example, please refer to Figure 25 , the first insulating layer 20 can also extend from the first portion 106 to the first surface 101 and not to the second portion 107, and the second insulating layer 30 can also extend from the first portion 106 to the first surface 101 and not to the second portion 107. The first surface 101 intersects with the first portion 106 at the second edge 18. Further, from the third direction Z, the first insulating layer 20 can extend from the second edge 18 along the first surface 101 towards the second portion 107 and not to the second portion 107; the second insulating layer 30 can extend from the second edge 18 along the first surface 101 towards the second portion 107 and not to the second portion 107. For another example, please refer to Figure 26 , the first insulating layer 20 extends from the second portion 107 to the first surface 101 and not to the second portion 106; the second insulating layer 30 extends from the first portion 106 to the first surface 101 and not to the second portion 107. At this time, the first direction X is the direction perpendicular to the second portion 107.

[0127] In some embodiments, the electrode assembly 10 can also be a stacked structure.

[0128] In some embodiments, referring to Figure 24 and Figure 27 , the fourth adhesive portion 70 can also be provided on the second surface 103 and can also be provided on the third insulating layer 17. When the first insulating layer 20 and the second insulating layer 30 extend to the second surface 103, the first adhesive portion 40, the second adhesive portion 50, and the third adhesive portion 60 can also be provided on the first insulating layer 20 and the second insulating layer 30 located on the second surface 103.

[0129] The method for manufacturing the battery 100 can further include the step of: providing the electrode assembly 10; pasting the first insulating layer 20 and the second insulating layer 30 on the electrode assembly 10; forming the first adhesive portion 40 on the surface of the electrode assembly 10 by, for example but not limited to, screen printing, spray gun dispensing, and the like; accommodating the electrode assembly 10 provided with the first adhesive portion 40, the first insulating layer 20, the second insulating layer 30, and the third insulating layer 17 in the housing 80; and then pressing the outer side of the housing 80 so that the first adhesive portion 40 is adhered to the inner side of the housing 80.

[0130] The method for manufacturing the battery 100 can further include the step of: pasting the third insulating layer 17 on the electrode assembly 10 before forming the first adhesive portion 40. Preferably, the third insulating layer 17 is pasted on the electrode assembly 10 before the first insulating layer 20 and the second insulating layer 30 are pasted on the electrode assembly 10.

[0131] The method for manufacturing the battery 100 can further include the step of: before accommodating the electrode assembly 10 in the housing 80, a second adhesive portion 50 can also be formed on the surface of at least one of the first insulating layer 20 and the second insulating layer 30 by, for example but not limited to, screen printing, spray gun dispensing, and the like. After the outer side of the housing 80 is pressed, the second adhesive portion 50 is adhered to the inner side of the housing 80.

[0132] The method for manufacturing the battery 100 can further include the step of: before accommodating the electrode assembly 10 in the housing 80, a third adhesive portion 60 can also be formed on the surface of at least one of the first insulating layer 20 and the second insulating layer 30 and on the surface of the electrode assembly 10 by, for example but not limited to, screen printing, spray gun dispensing, and the like. After the outer side of the housing 80 is pressed, the third adhesive portion 60 is adhered to the inner side of the housing 80.

[0133] The method for manufacturing the battery 100 can further include the step of: before accommodating the electrode assembly 10 in the housing 80, a fourth adhesive portion 70 can also be formed on the surface of the electrode assembly 10 by, for example but not limited to, screen printing, spray gun dispensing, and the like. After the outer side of the housing 80 is pressed, the fourth adhesive portion 70 is adhered to the inner side of the housing 80.

[0134] The following will be further described through specific examples and comparative examples. The structure and model of the electrode assembly 10 applied to each example and comparative example are all the same.

[0135] Comparative Example 1

[0136] See Figure 28 , the surface of the electrode assembly is not provided with an adhesive portion, a first insulating layer and a second insulating layer are provided on the electrode assembly, and the first insulating layer and the second insulating layer respectively extend from the first surface through the second portion to the second surface to fix the electrode assembly. The shell (aluminum plastic film) contains the electrode assembly and is fixed with the electrode assembly through the adhesive portion, electrolyte is injected and the shell is sealed to obtain a battery, the battery is subjected to formation treatment, then subjected to a standard charge-discharge process to activate the capacity of the battery, and finally the battery is subjected to degassing treatment to complete the preparation.

[0137] Comparative Example 2

[0138] See Figure 29 , the difference between Comparative Example 2 and Comparative Example 1 is that the adhesive portion is provided on the first surface of the electrode assembly at the first region where the first surface of the electrode assembly is located on the side away from the second portion of the first insulating layer and the second insulating layer.

[0139] Example 1

[0140] See Figure 30 , the difference between Example 1 and Comparative Example 2 is that the adhesive portion is also provided on the second region of the first surface of the electrode assembly, which is in addition to the region provided with the first insulating layer and the second insulating layer and the first region, i.e., the second region includes the region between the first insulating layer and the second insulating layer, the region on the side of the first insulating layer away from the second insulating layer, and the region on the side of the second insulating layer away from the first insulating layer.

[0141] Example 2

[0142] See Figure 31 , the difference between Example 2 and Example 1 is that the adhesive portion is also provided at the junction of the surface of the first insulating layer away from the first surface and the first surface, the surface of the first insulating layer away from the first surface, the junction of the surface of the second insulating layer away from the first surface and the first surface, and the surface of the second insulating layer away from the first surface.

[0143] Example 3

[0144] See Figure 32 , the difference between Example 3 and Comparative Example 2 is that the adhesive portion is also provided on the region of the first surface of the electrode assembly between the first insulating layer and the second insulating layer.

[0145] Example 4

[0146] See Figure 33Example 4 differs from Comparative Example 1 in that the adhesive portion is provided only in the region of the first surface of the electrode assembly between the first insulating layer and the second insulating layer.

[0147] The batteries of Comparative Examples 1-2 and Examples 1-4 were charged at room temperature with a current of 0.2C, and the thickness of each battery was measured after full charging. Each battery was then discharged to the cut-off voltage, and then charged at a constant current and constant voltage to the limit voltage with a current of 0.8C, and the thickness of each region of the battery was measured as the initial thickness (here, the thickness D1 of the region of the battery provided with the first insulating layer or the thickness D2 of the region of the battery provided with the second insulating layer, or the thickness D3 of the region of the battery between the first insulating layer and the second insulating layer; see Figure 34 ; wherein the region measured for the battery of Comparative Example 1, which was not provided with the first insulating layer and the second insulating layer, corresponds to the region measured for the battery of the comparative example / example provided with the first insulating layer and the second insulating layer), and the difference between D3 and D1 or the difference between D3 and D2, ΔD, was calculated and recorded in Table 1 below. The batteries were then cycled 700 times at a charge and discharge rate of 0.8C / 1C, and the thickness of each region was measured again after 700 cycles, i.e. the thickness after cycling, and the difference between D3 and D1 or the difference between D3 and D2, ΔD, was calculated and recorded in Table 1 below.

[0148] Table 1

[0149]

[0150]

[0151] From the above data, it can be seen that the provision of the first insulating layer and the second insulating layer can inhibit the swelling of the battery. After the charge and discharge cycling of the battery, the deformation of the battery provided with the adhesive portion between the first insulating layer and the second insulating layer is significantly less than the deformation of the battery not provided with the adhesive portion between the first insulating layer and the second insulating layer.

[0152] The two opposite surfaces connecting the first part (i.e. the head) and the second part (i.e. the bottom) of the connecting region of the electrode assembly are defined as the third part and the fourth part, respectively. After charging the batteries of Comparative Examples 1-2 and Examples 1-4 at room temperature to the limit voltage at a current of 0.2C, the batteries were subjected to drop test, specifically, the batteries were fixed in a special drop test box by special glue, a mechanical arm grabbed the drop test box with the battery and released it to the marble plate at a height of 1.8m according to the preset drop mode, wherein the preset drop mode was six times of drop in the order of first surface downward→second surface downward→first part downward→third part downward→second part downward→fourth part downward. After each round of drop, the surface of the battery (i.e. the aluminum plastic film) was observed for damage, and the open circuit voltage of the battery was measured. If the open circuit voltage of the battery is less than 3.0V, the battery is failed, and if the surface of the battery, i.e. the aluminum plastic film, is damaged, the battery is also determined to be failed. Each group of comparative examples or examples was tested for 5 batteries per round, and the average value was taken, and the drop round number, failure cause and damage condition of the battery at the time of failure were recorded in Table 2.

[0153] Table 2

[0154]

[0155] From the above data, it can be seen that the setting of the bonding part in the region between the first insulating layer and the second insulating layer is more conducive to the improvement of the battery drop failure than the setting of no bonding part, thereby being more conducive to improving the safety of the battery. Secondly, the setting of the bonding part while setting the first insulating layer and the second insulating layer can improve the drop failure of the battery, and is conducive to improving the safety of the battery.

[0156] The battery of the present application has the first insulating layer and the second insulating layer arranged on the surface of the electrode assembly, and the first bonding part arranged between the first insulating layer and the second insulating layer. When the shell encapsulates the electrode assembly, the first bonding part bonds the electrode assembly and the shell. When the battery is subjected to external force, it is conducive to reducing the damage of the electrode assembly to the shell, and at the same time, it is conducive to protecting the electrode assembly itself, thereby being conducive to improving the safety of the battery and prolonging the service life of the battery.

[0157] In addition, for those skilled in the art, various corresponding changes and modifications can be made according to the technical concept of the present application, and all these changes and modifications shall belong to the protection scope of the present application.

Claims

1. A battery, comprising: An electrode assembly includes an outer surface, the outer surface including a first surface and a second surface disposed opposite to the first surface; A first insulating layer is disposed on the first surface; A second insulating layer is disposed on the first surface and spaced apart from the first insulating layer along a first direction, the first direction being parallel to the first surface; as well as The first adhesive portion is disposed on the first surface and located in the region between the first insulating layer and the second insulating layer; The battery further includes a third adhesive portion, which is disposed on the surface of the first insulating layer away from the second surface and extends to the area of ​​the first surface where the first insulating layer is not disposed. The battery also includes a housing that encloses the electrode assembly, the first insulating layer, and the second insulating layer, and is bonded to the electrode assembly via the first adhesive portion and the third adhesive portion.

2. The battery as claimed in claim 1, wherein, The area of ​​the first adhesive portion projected onto the first surface is smaller than the total area of ​​the first insulating layer and the second insulating layer projected onto the first surface.

3. The battery as claimed in claim 2, wherein, The area of ​​the first adhesive portion projected onto the first surface is smaller than the area of ​​the first insulating layer projected onto the first surface, and smaller than the area of ​​the second insulating layer projected onto the first surface.

4. The battery as claimed in claim 1, wherein, Viewed from a direction perpendicular to the first surface, the distance from the portion of the first surface overlapping the first insulating layer to the second surface is the first distance, and the distance from the first adhesive portion to the second surface is the second distance, wherein the first distance is less than the second distance.

5. The battery as claimed in claim 4, wherein, The first distance is the distance from the end of the first surface corresponding to the first insulating layer to the second surface.

6. The battery as claimed in claim 4, wherein, Viewed from a direction perpendicular to the first surface, the distance from the portion of the first surface that overlaps with the second insulating layer to the second surface is a third distance, which is less than the second distance.

7. The battery as claimed in claim 6, wherein, The third distance is the distance from the end of the first surface corresponding to the second insulating layer to the second surface.

8. The battery as claimed in claim 6, wherein, The first distance is not equal to the third distance.

9. The battery as claimed in claim 1, wherein, The length of the first adhesive portion in the first direction is less than half the length of the first surface in the first direction.

10. The battery as claimed in claim 1, wherein, The first surface has a first groove corresponding to the first adhesive portion, and the first adhesive portion is located in the first groove.

11. The battery of claim 10, wherein, There are at least two first adhesive portions, and each first adhesive portion is located in a first groove.

12. The battery as claimed in claim 1, wherein, The battery further includes a second adhesive portion disposed on the surface of the first insulating layer opposite to the second surface, and the area of ​​the second adhesive portion projected onto the first surface is smaller than the area of ​​the first insulating layer projected onto the first surface.

13. The battery of claim 12, wherein, The first adhesive portion is in a dot matrix distribution, and / or the second adhesive portion is in a dot matrix distribution.

14. The battery of claim 12, wherein, The first insulating layer has a second groove on the surface corresponding to the second adhesive portion, and each second adhesive portion is located in the second groove.

15. The battery as claimed in claim 1, wherein, The electrode assembly further includes a connection region connecting the first surface and the second surface, wherein the first insulating layer extends from the first surface to the connection region, and the second insulating layer extends from the first surface to the connection region.

16. The battery of claim 15, wherein, The first insulating layer and the second insulating layer are located on the same side of the electrode assembly.

17. The battery of claim 16, wherein, The electrode assembly further includes a metal portion, the connection area includes a first portion and a second portion opposite to the first portion, the metal portion is disposed in the first portion, and the first insulating layer and the second insulating layer extend to the second portion.

18. The battery as claimed in claim 1, wherein, The battery further includes a fourth adhesive portion disposed on the first surface. The area on the first surface where the fourth adhesive portion is disposed is spaced apart from the area on the first surface where the first insulating layer and the second insulating layer are disposed, as well as the area on the first surface located between the first insulating layer and the second insulating layer. The fourth adhesive portion does not contact the first insulating layer and the second insulating layer.

19. The battery of claim 18, wherein, Viewed from a direction perpendicular to the first surface, the electrode assembly includes at least two fourth adhesive portions of different shapes.

20. The battery as claimed in claim 1, wherein, The electrode assembly further includes a third insulating layer. The electrode assembly has a wound structure. The third insulating layer is disposed on the second surface and fixes the end of the outermost electrode sheet of the electrode assembly.

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