Battery

Abstract

A battery includes an electrode assembly, a first insulating layer, a second insulating layer, and a first adhesive portion. The electrode assembly comprises a first surface and a second surface opposite to the first surface; the first insulating layer is arranged on the first surface; the second insulating layer is arranged on the first surface, and the second insulating layer and the first insulating layer are arranged at an interval along a first direction; the first bonding part is arranged on the first surface and located in an area between the first insulating layer and the second insulating layer. The battery provided by the invention is beneficial to improving the impact resistance.

Description

[0001] This application is a divisional application with application number 202010246220.8, application date March 31, 2020, and invention name “Battery”. Technical Field

[0002] The present application relates to a battery. Background Art

[0003] With the mature application of consumer electronics, electric vehicles, etc., customers are paying more and more attention to the risks of whole machine application. For example, the requirements for the impact resistance of electronic products are getting higher and higher. As an important component of electronic products, batteries also have requirements for impact resistance. When the battery is impacted in electronic products, the electrode assembly contained in the battery shell is easy to damage the shell, or the electrode assembly itself is damaged by the impact, thus affecting the safety and service life of the battery. Summary of the invention

[0004] In view of the above circumstances, it is necessary to provide a battery that is conducive to improving impact resistance and thus improving 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 is disposed on the first surface and is spaced apart from the first insulating layer along a first direction, wherein the first direction is parallel to the first surface; and

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

[0010] The battery further comprises a third bonding portion, which is arranged on a surface of the first insulating layer away from the second surface and extends to an area of ​​the first surface where the first insulating layer is not arranged;

[0011] The battery also includes a shell, which wraps the electrode assembly, the first insulating layer and the second insulating layer, and is bonded to the electrode assembly through a first bonding portion.

[0012] As a solution of the present application, an area of ​​an orthographic projection of the first adhesive portion on the first surface is smaller than a total area of ​​an orthographic projection of the first insulating layer and the second insulating layer on the first surface.

[0013] As a solution of the present application, an area of ​​an orthographic projection of the first adhesive portion on the first surface is smaller than an area of ​​an orthographic projection of the first insulating layer on the first surface, and smaller than an area of ​​an orthographic projection of the second insulating layer on the first surface.

[0014] As a scheme of the present application, when observed from a direction perpendicular to the first surface, the distance from the partial area where the first surface overlaps with the first insulating layer to the second surface is a first distance, and the distance from the first adhesive portion to the second surface is a second distance, and the first distance is smaller than the second distance.

[0015] As a solution of the present application, the first distance is the distance from the end of the first surface corresponding to the first insulating layer to the second surface.

[0016] As a solution of the present application, when observed from a direction perpendicular to the first surface, a distance from a partial area where the first surface overlaps with the second insulating layer to the second surface is a third distance, and the third distance is smaller than the second distance.

[0017] As a solution of the present application, the third distance is the distance from the end of the first surface corresponding to the second insulating layer to the second surface.

[0018] As a solution of the present application, the first distance is not equal to the third distance.

[0019] As a solution of the present application, the length of the first adhesive portion in the first direction is less than half of the length of the first surface in the first direction.

[0020] As a solution of the present application, a first groove is provided on the first surface corresponding to the first adhesive portion, and the first adhesive portion is located in the first groove.

[0021] As a solution of the present application, there are two or more first bonding portions, and each first bonding portion is located in a first groove.

[0022] As a solution of the present application, the battery also includes a second bonding portion, which is arranged on the surface of the first insulating layer away from the second surface, and the area of ​​the second bonding portion's orthographic projection on the first surface is smaller than the area of ​​the first insulating layer's orthographic projection on the first surface.

[0023] As a solution of the present application, the first adhesive portion is distributed in a dot matrix, and / or the second adhesive portion is distributed in a dot matrix.

[0024] As a solution of the present application, a second groove is provided on the surface of the first insulating layer corresponding to the second adhesive portion, and each second adhesive portion is located in the second groove.

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

[0026] As a solution 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 a solution of the present application, the electrode assembly also includes a metal part, the connection area includes a first part and a second part opposite to the first part, the metal part is arranged in the first part, and the first insulating layer and the second insulating layer extend to the second part.

[0028] As a scheme of the present application, the battery also includes a fourth bonding portion, which is arranged on the first surface, and the area of ​​the first surface where the fourth bonding portion is provided is separated from the area of ​​the first surface where the first insulating layer and the second insulating layer are provided and the area of ​​the first surface between the first insulating layer and the second insulating layer, and the fourth bonding portion does not contact the first insulating layer and the second insulating layer.

[0029] As a solution of the present application, when viewed from a direction perpendicular to the first surface, the electrode assembly includes at least two fourth bonding portions with different shapes.

[0030] As a solution of the present application, the electrode assembly further includes a third insulating layer. The electrode assembly is a winding structure. The third insulating layer is arranged on the second surface and fixes the end of the outermost pole piece of the electrode assembly.

[0031] As a solution of the present application, the shell is bonded to the electrode assembly through a third bonding portion.

[0032] The battery of the present application has a first insulating layer and a second insulating layer on the surface of the electrode assembly, and a first bonding portion is provided between the first insulating layer and the second insulating layer. When the electrode assembly is encapsulated in the shell, the first bonding portion bonds the electrode assembly and the shell, which is beneficial to improving the safety of the battery and extending the service life of the battery when the battery is subjected to external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of a battery according to one embodiment of the present application.

[0034] Figure 2 It is a side view of a battery according to one embodiment of the present application.

[0035] Figure 3 It is a schematic structural diagram of a stacking body according to one embodiment of the present application.

[0036] Figure 4 It is a schematic structural diagram of the first conductive layer according to one embodiment of the present application.

[0037] Figure 5 Schematic diagram of the structure of the second conductive layer according to one embodiment of the present application.

[0038] Figure 6 This is a schematic diagram of the structure of an electrode assembly according to one embodiment of the present application.

[0039] Figure 7 This is a schematic diagram of the structure of an electrode assembly according to one embodiment of the present application.

[0040] Figure 8 It is a schematic structural diagram of a battery according to one embodiment of the present application.

[0041] Fig. 9 This is a front view of a battery according to one embodiment of the present application.

[0042] Fig.10 It is a schematic cross-sectional view of a battery along a first direction according to an embodiment of the present application.

[0043] Fig.11 It is a schematic cross-sectional view of a battery along the second direction according to one embodiment of the present application.

[0044] Fig.12 It is a schematic cross-sectional view of a battery along a first direction according to an embodiment of the present application.

[0045] Fig.13 It is a schematic cross-sectional view of a battery along a first direction according to an embodiment of the present application.

[0046] Fig.14 It is a schematic structural diagram of the first bonding portion or the fourth bonding portion according to one embodiment of the present application.

[0047] Fig.15 It is a schematic structural diagram of the first bonding portion or the fourth bonding portion according to one embodiment of the present application.

[0048] Fig.16 It is a schematic structural diagram of the first bonding portion or the fourth bonding portion according to one embodiment of the present application.

[0049] Fig.17 It is a schematic structural diagram of the first bonding portion or the fourth bonding portion according to one embodiment of the present application.

[0050] Fig.18 It is a schematic structural diagram of a battery according to one embodiment of the present application.

[0051] Fig.19 It is a schematic diagram of a partial disassembly of a battery according to one embodiment of the present application.

[0052] Fig. 20 It is a partial cross-sectional schematic diagram of a battery along the second direction according to one embodiment of the present application.

[0053] Fig.21 It is a partial cross-sectional schematic diagram of a battery along the second direction according to one embodiment of the present application.

[0054] Fig. 22 It is a side view of a battery according to one embodiment of the present application.

[0055] Fig.23 It is a rear view of a battery according to one embodiment of the present application.

[0056] Fig.24 This is a bottom view of a battery according to one embodiment of the present application.

[0057] Fig.25 It is a schematic structural diagram of a battery according to one embodiment of the present application.

[0058] Fig.26 It is a schematic structural diagram of a battery according to one embodiment of the present application.

[0059] Fig. 27 This is a bottom view of a battery according to one embodiment of the present application.

[0060] Fig.28 It is a schematic diagram of a part of the structure of the battery of Comparative Example 2 in this application.

[0061] Fig.29 It is a schematic diagram of a part of the structure of the battery of comparative example 3 in this application.

[0062] Fig.30 This is a schematic diagram of a portion of the structure of the battery of Example 1 in this application.

[0063] Fig.31 This is a schematic diagram of a portion of the structure of the battery of Example 2 in this application.

[0064] Fig.32 This is a schematic diagram of a portion of the structure of the battery of Example 3 in this application.

[0065] Fig.33 This is a schematic diagram of a portion of the structure of the battery of Example 4 in this application.

[0066] Fig.34 Schematic diagram of the structure of a battery according to an embodiment of the present application.

[0067] Main component symbols

[0068]

[0069]

[0070]

[0071] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0072] The technical scheme in the embodiment of the present application is described clearly and in detail below. Obviously, the described embodiment is only a part of the embodiment of the present application, rather than all the embodiments. 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 the present application. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[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 being limited to the exemplary embodiments illustrated herein. Rather, these exemplary embodiments are provided so that the present application is thoroughly and in detail communicated to those skilled in the art.

[0074] In addition, for simplicity and clarity, in the accompanying drawings, the size or thickness of various components, layers may be amplified. Throughout the entire text, the same numerical value refers to the same element. As used herein, the term "and / or", "and / or" includes any and all combinations of one or more related enumerated items. In addition, it should be understood that when element A is referred to as "connecting" element B, element A may be directly connected to element B, or there may be an intermediate element C and element A and element B may be indirectly connected to each other.

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

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

[0077] Spatial related terms, such as "on" and the like can be used herein for convenient description, to describe the relationship between an element or feature and another element (multiple elements) or feature (multiple features) as illustrated in the figure. It should be understood that, in addition to the directions described in the figure, spatial related terms are intended to include different directions of equipment or devices in use or operation. For example, if the equipment in the figure is turned over, the elements described as "above" or "on" other elements or features will be oriented "below" or "below" other elements or features. Therefore, the exemplary term "on" may include the direction above and below. It should be understood that although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, the first element, component, region, layer or part discussed below may be referred to as the second element, component, region, layer or part without departing from the teaching of the exemplary embodiment.

[0078] Some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0079] See also 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] See also Figure 1 The electrode assembly 10 includes a first surface 101 , a second surface 103 disposed opposite to the first surface 101 , and a connection area 105 connecting the first surface 101 and the second surface 103 .

[0081] See also Figure 1 The electrode assembly 10 includes a pole piece 11 and a separator (not shown), and the pole piece 11 and the separator are wound to form a winding structure. The first surface 101, the second surface 103 and the connection area 105 are part of the outer surface of the electrode assembly 10.

[0082] For example, Figure 1 The electrode assembly 10 shown in the figure is formed by multiple windings. At this time, the electrode assembly 10 has multiple bending portions in one direction, that is, the X direction in the figure. The multiple bending portions are respectively distributed on the opposite sides of the center of the battery 100 along the X direction. Figure 1The connection point between an outer plane of the electrode assembly 10 and an end of the outermost bending portion located on the left side of the center of the battery 100 closest to the center of the battery 100 is the first end 101A, and the connection point between the outer plane of the electrode assembly 10 and an end of the outermost bending portion located on the right side of the center of the battery 100 closest to the center of the battery 100 is the second end 101B.

[0083] In this embodiment, the first surface 101 is, for example, Figure 1 When viewed in the Z direction as shown, 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.

[0084] For example, for a stacked electrode assembly 10 formed by stacking electrode sheets 11 and isolation membranes along the Z direction, the electrode assembly 10 includes four edges perpendicular to the Z direction, and the area surrounded by the four edges is the second surface 103 .

[0085] The electrode assembly 10 is further described below using an example.

[0086] See also Figure 3 , the battery assembly 10 may include: a first conductive layer 10A, a first isolation layer 10B, a second conductive layer 10C, and a second isolation layer 10D. The first isolation layer 10B is formed on the surface 10a of the first conductive layer 10A. The second conductive layer 10C is formed on the surface 10b of the first isolation layer 10B away from the first conductive layer 10A. The second isolation layer 10D is formed on the surface 10c of the second conductive layer 10C away from the first isolation layer 10B. Thus, a stack 10E can be formed, and the electrode assembly 10 is formed based on the stack 10E.

[0087] See also Figure 3 and Figure 4 , viewed from a direction perpendicular to the surface 10a, the first conductive layer 10A, for example, may be rectangular. The first conductive layer 10A, for example, may be formed by stacking a current collector 10AA and an active material layer 10AB. The current collector 10AA, for example, may at least include but is not limited to one or more of conductive metal sheets such as aluminum mesh and aluminum foil. The active material layer 10AB, for example, may at least include but is not limited to one or more of lithium cobalt oxide, 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 phosphate, lithium iron phosphate, lithium titanate and lithium-rich manganese-based materials. The first conductive layer 10A, for example, can be used as a positive electrode sheet when constituting the electrode assembly 10 of the battery 100.

[0088] See also Figure 3, viewed from a direction perpendicular to the surface 10b, the first isolation layer 10B, for example, may be rectangular. The first isolation layer 10B, for example, may at least include but is not limited to one or more of polyethylene, polypropylene, polyethylene terephthalate, polyimide, and aramid. The first isolation layer 10B, for example, may serve as an isolation membrane when constituting the electrode assembly 10 of the battery 100.

[0089] See also Figure 3 and Figure 5 , viewed from a direction perpendicular to the surface 10c, the second conductive layer 10C, for example, may be rectangular. The second conductive layer 10C, for example, may be formed by stacking a current collector 10CA and an active material layer 10CB on each other. The current collector 10CA, for example, may at least include but is not limited to one or two of conductive metal sheets such as nickel foil and copper foil. The active material layer 10CB, for example, may at least include 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 that can form alloys with lithium. The second conductive layer 10C, for example, can be used as a negative electrode sheet when constituting the electrode assembly 10 of the battery 100.

[0090] From the direction perpendicular to the surface 10b, the second isolation layer 10D, for example, may be rectangular. The second isolation layer 10D, for example, may at least include but is not limited to one or more of polyethylene, polypropylene, polyethylene terephthalate, polyimide and aramid. The second isolation layer 10D, for example, may serve as an isolation film when constituting the electrode assembly 10 of the battery 100.

[0091] See also Figure 6 The electrode assembly 10, for example, can be formed by winding a stack 10Ea formed by stacking a plurality of stacks 10E. Or, for example, see Figure 7 The electrode assembly 10 can be formed by directly stacking a plurality of stacking bodies 10E.

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

[0093] In this embodiment, the second surface 103 is, for example, Figure 1 When observed in the Z direction as shown, the plane of the electrode assembly 10 opposite to the first surface 101 corresponds to the area surrounded 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] See also Figure 1 and Figure 8 The connection area 105 includes a first portion 106 and a second portion 107 opposite to the first portion 106. The electrode assembly 10 may further include a metal portion 15, which is disposed on the first portion 106. One end of the metal portion 15 is connected to the electrode sheet 11, and the other end may be connected to other electronic components to achieve electrical conduction between the electrode assembly 10 and other electronic components.

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

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

[0097] The first surface 101 and the second portion 107 intersect at the first edge 16. In some embodiments, the first direction X is the direction of the first edge 16. From the third direction Z, the first insulating layer 20 and the second insulating layer 30 extend from the first edge 16 along the first surface 101 toward the first portion 106 and do not reach the first portion 106.

[0098] The length L1 of the first insulating layer 20 extending from the first side 16 to the first portion 106 and the length L2 of the second insulating layer 30 extending from the first side 16 to the first portion 106 are not particularly limited when 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 of the first insulating layer 20 extending from the first side 16 to the first portion 106 and the length L2 of the second insulating layer 30 extending from the first side 16 to the first portion 106 are equal. Here, the length direction is defined as the second direction Y.

[0099] The first insulating layer 20 and the second insulating layer 30 may respectively include a glue layer and a substrate which are stacked, wherein the glue layer bonds the substrate and the electrode assembly 10. The glue layer may include, for example, at least one or more of natural rubber, synthetic rubber, acrylate, silicone, and ethylene-vinyl acetate. The substrate may include, for example, at least one or more of polyethylene, polypropylene, Teflon, polyvinyl chloride, polyimide, and non-woven fabric.

[0100] See also Figure 1 , Figure 2 and Fig. 9, when viewed from a third direction Z perpendicular to the first surface 101, the first bonding 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 bonding 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 may be less than half of the length of the first surface 101 in the first direction X.

[0101] In some embodiments, the area of ​​the orthographic projection of the first adhesive portion 40 on the first surface 101, in other words, the area of ​​the projection of the first adhesive portion 40 on the first surface 101 along the third direction Z perpendicular to the first surface 101, may be smaller than the total area of ​​the orthographic projections 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 orthographic projection of the first adhesive portion 40 on the first surface 101 may be smaller than the area of ​​the orthographic projection of the first insulating layer 20 on the first surface 101, and at the same time may be smaller than the area of ​​the orthographic projection of the second insulating layer 30 on the first surface 101.

[0102] The first bonding portion 40, for example, may at least include but is not limited to one of the polymers selected from the group consisting of cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinyl pyrrolidone, 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] See also Fig.10 , a first distance H1 from at least a portion of the area where the first surface 101 overlaps with the first insulating layer 20 to the second surface 103 is less than a second distance H2 from the first bonding portion 40 to the second surface 103. Under the premise of ensuring that the first distance H1 is less than the second distance H2, the distances from different positions in at least a portion of the area where the first surface 101 overlaps with the first insulating layer 20 to the second surface 103 may be different. Figure 1 , Fig. 9 and Fig.10 Here, at least a portion of the area where the first edge 16 overlaps with the first insulating layer 20 refers to the end portion corresponding to the first surface 101 and the first insulating layer 20, and the first distance H1 to the second surface 103 is smaller than the second distance H2 from the first adhesive portion 40 to the second surface 103.

[0104] For details, please refer to Fig.11, a first concave portion 120 is disposed on the first surface 101, and the first concave portion 120 is disposed from the first side 16 toward the first portion 106. At least a portion of the first insulating layer 20 away from the first portion 106 is disposed in the first concave portion 120. In this embodiment, the first concave portion 120 may be an inclined groove, and a depth thereof gradually decreases from the first side 16 along the second direction Y toward the first portion 106. A portion of the first insulating layer 20 close to the first portion 106 may be located outside the first concave portion 120.

[0105] Please combine Figure 1 , Fig. 9 and Fig.10 , the third distance H3 from at least a portion of the area where the first surface 101 overlaps with the second insulating layer 30 to the second surface 103 is less than the second distance H2. Under the premise of ensuring that the third distance H3 is less than the second distance H2, the distances from different positions to the second surface 103 in at least a portion of the area where the first surface 101 overlaps with the second insulating layer 20 may be different. Further, here, at least a portion of the area where the first side 16 overlaps with the second insulating layer 30 refers to the end portion corresponding to the first surface 101 and the second insulating layer 30, and the third distance H3 to the second surface 103 is less than the second distance H2.

[0106] See also Fig.11 , a second recess 130 is disposed on the first surface 101, and the second recess 130 is disposed from the first side 16 toward the first portion 106. At least a portion of the second insulating layer 30 away from the first portion 106 is disposed in the second recess 130. In this embodiment, the second recess 130 may be an inclined groove, the depth of which gradually decreases from the first side 16 along the second direction Y toward the first portion 106. A portion of the second insulating layer 30 close to the first portion 106 may be located outside the second recess 130.

[0107] In some embodiments, see Fig.12 , the first distance H1 and the third distance H3 may not be equal.

[0108] See also Fig.13 The first surface 101 may be provided with a first groove 140, and the first adhesive portion 40 is located in the first groove 140. In this embodiment, there are multiple first adhesive portions 40, and the number of first grooves 140 is multiple, and each first adhesive portion 40 is located in one first groove 140.

[0109] When viewed from the third direction Z, the shape of the first bonding portion 40 is not limited and can be circular (see Fig. 9 ), rectangle (see Fig.14 and Fig.15 ), strips (see Fig.16), other regular or irregular shapes, or a combination of these shapes. The number of the first adhesive portion 40 can also be set according to actual needs, and can be one or more. When the number of the first adhesive portion 40 is multiple, the multiple first adhesive portions 40 are arranged at intervals (for example, in a dot matrix distribution), and when viewed from the third direction Z, the battery 100 may include at least two first adhesive portions 40 with different shapes (see Fig.17 ). In some embodiments, see Fig. 9 When viewed from the third direction Z, the shapes of all the first bonding portions 40 may also be consistent.

[0110] See also Fig.18 and Fig.19 The battery 100 may further include a shell 80. The shell 80 may be, for example, but 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 bonded to the electrode assembly 10 through the first bonding portion 40 (see also Fig. 20 ). The first bonding portion 40 is disposed in the region 101a of the first insulating layer 20 and the second insulating layer 30, so that the region of the battery 100 where the first insulating layer 20 and the second insulating layer 30 are disposed and the region corresponding to the region 101a in the battery are compressed more evenly in the horizontal direction, i.e., along the first direction X and the second direction Y during the formation process, which is beneficial to reduce the degree of deformation of the battery 100 during use. Disposing the first bonding portion 40 between the first insulating layer 20 and the second insulating layer 30 can increase the bonding force between the electrode assembly 10 and the shell 80, so as to suppress the relative displacement between the electrode assembly 10 and the shell 80 when the battery 100 is subjected to an external force, thereby reducing the possibility of the battery 100 being damaged by the external force and extending the service life of the battery 100. At the same time, since the first bonding portion 40 is bonded to the shell 80 and the electrode assembly 10, it is also helpful to suppress the deformation of the electrode assembly 10. In addition, the shape of the first bonding portion 40 after bonding to the shell 80 can change. When there are multiple first bonding parts 40, after the multiple first bonding parts 40 are bonded to the housing 80, the multiple first bonding parts 40 can be arranged at intervals, or adjacent first bonding parts 40 can be connected (see Fig.16 ).

[0111] See also Figure 1 , Figure 2 , Fig. 9 and Fig.10The battery 100 may further include a second adhesive portion 50, which is disposed on a surface 21 of the first insulating layer 20 away from the second surface 103. The area of ​​the orthographic projection of the second adhesive portion 50 on the first surface 101 is smaller than the area of ​​the orthographic projection of the first insulating layer 20 on the first surface 101. The second adhesive portion 50 may also be disposed on a surface 31 of the second insulating layer 30 away from the second surface 103, in which case the area of ​​the orthographic projection of the second adhesive portion 50 on the first surface 101 is smaller than the area of ​​the orthographic projection of the second insulating layer 30 on the first surface 101.

[0112] The second adhesive portion 50, for example, may at least include but is not limited to one of the polymers selected from the group consisting of cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinyl pyrrolidone, 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] When viewed from the third direction Z, the shape of the second adhesive portion 50 is not limited, and may be circular, rectangular, strip-shaped, other regular or irregular shapes, or a combination of these shapes. The number of the second adhesive portions 50 may also be set according to actual needs, and may be one or more. When the number of the second adhesive portions 50 is multiple, the multiple second adhesive portions 50 are arranged at intervals (for example, in a dot matrix distribution), and when viewed from the third direction Z, the battery 100 may include at least two second adhesive portions 50 of different shapes. In some embodiments, when viewed from the third direction Z, the shapes of all the second adhesive portions 50 may also be consistent.

[0114] In some embodiments, see Fig.13 A second groove 150 is formed on a surface of the first insulating layer 20 facing away from the second surface 103 , and the second adhesive portion 50 is located in the second groove 150 .

[0115] See also Fig.18 and Fig.21 , the housing 80 is bonded to the first insulating layer 20 through the second bonding portion 50. The housing 80 may also be bonded to the second insulating layer 30 through the second bonding portion 50. The housing 80 may also be bonded to the first insulating layer 20 and the second insulating layer 30 through the second bonding portion 50. When there are multiple second bonding portions 50, after the multiple second bonding portions 50 are bonded to the housing 80, the multiple second bonding portions 50 may be arranged at intervals, or adjacent second bonding portions 50 may be connected.

[0116] See also Figure 1 , Figure 2 and Fig. 9 The battery 100 may further include a third adhesive portion 60 , which is disposed on a surface 21 of the first insulating layer 20 away from the second surface 103 , and extends across a boundary between the first insulating layer 20 and the first surface 101 to the first surface 101 .

[0117] The third bonding portion 60, for example, may at least include but is not limited to one of the polymers selected from the group consisting of cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinyl pyrrolidone, 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] See also Fig.18 and Fig.21 , the third adhesive portion 60 adheres to the housing 80. The housing 80 can be bonded to the first insulating layer 20 through the third adhesive portion 60. The housing 80 can also be bonded to the second insulating layer 30 through the third adhesive portion 60. The housing 80 can also be bonded to the first insulating layer 20 and the second insulating layer 30 at the same time through the third adhesive portion 60.

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

[0120] For details, please refer to Fig. 9 , the region 101b includes a first block 101b1 and a second block 101b2. The first block 101b1 is away from the region 101a in the second direction Y. The second block 101b2 is located on a side of the first insulating layer 20 away from the second insulating layer 30 and on a side of the second insulating layer 30 away from the first insulating layer 20 in the first direction X. In this embodiment, the fourth adhesive portion 70 is located on the first block 101b1 of the region 101b.

[0121] The fourth bonding portion 70, for example, may at least include but is not limited to one of the polymers selected from the group consisting of cellulose, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethyl methacrylate, polybutyl acrylate, polyacrylonitrile, polyvinyl pyrrolidone, 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.

[0122] When viewed from the third direction Z, the shape of the fourth bonding portion 70 is not limited and may be circular (see Fig. 9 ), rectangle (see Fig.14 and Fig.15 ), strips (see Fig.16 ), other regular or irregular shapes, or a combination of these shapes. The number of the fourth bonding portion 70 can also be set according to actual needs, and can be one or more. When the number of the fourth bonding portion 70 is multiple, the multiple fourth bonding portions 70 are arranged at intervals (for example, in a dot matrix distribution), and when viewed from the third direction Z, the battery 100 may include at least two fourth bonding portions 70 with different shapes (see Fig.17 In some embodiments, when viewed from the third direction Z, the shapes of all the fourth bonding portions 70 may be consistent.

[0123] See also Fig.18 and Fig.21 The shell 80 is further bonded to the electrode assembly 10 through the fourth bonding portion 70. When there are multiple fourth bonding portions 70, after the multiple fourth bonding portions 70 are bonded to the shell 80, the multiple fourth bonding portions 70 can be arranged at intervals, or adjacent fourth bonding portions 70 can be connected (see Fig.16 ).

[0124] See also Figure 2 , Fig.21 and Fig. 22, the first insulating layer 20 and the second insulating layer 30 also extend from the first surface 101 to the connection area 105, respectively. In this embodiment, the first insulating layer 20 and the second insulating layer 30 extend from the first surface 101 to the second portion 107, respectively. Further, the first insulating layer 20 and the second insulating layer 30 may also continue to extend from the second portion 107 to the second surface 103, respectively. The first insulating layer 20 and the second insulating layer 30 are arranged on the first surface 101 to isolate the electrode assembly 10 and the shell 80, thereby reducing the contact between the electrode assembly 10 and the shell 80, reducing the possibility of the electrode assembly 10 damaging the shell 80, and avoiding the shell damage caused by the falling of the active material on the area where the electrode assembly 10 is combined with the first insulating layer 20 and the second insulating layer 30. 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 shell 80, reducing the possibility of damage caused by the sharp part of the surface of the electrode assembly 10 impacting the shell 80. 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 and preventing the electrode assembly 10 from spreading.

[0125] See also Fig.23 and 24 The electrode assembly 10 may further include a third insulating layer 17 , which is disposed on the second surface 103 and fixes the end of the outermost electrode piece 11 of the electrode assembly 10 .

[0126] In some embodiments, the positions of the first insulating layer 20 and the second insulating layer 30 are not limited to the above-mentioned situations. Fig.25 , the first insulating layer 20 may 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 may also extend from the first portion 106 to the first surface 101 and not to the second portion 107. The first surface 101 and the first portion 106 intersect at the second side 18. Further, from the third direction Z, the first insulating layer 20 may extend from the second side 18 along the first surface 101 toward the second portion 107 and not to the second portion 107; the second insulating layer 30 may extend from the second side 18 along the first surface 101 toward the second portion 107 and not to the second portion 107. For another example: Please refer to Fig.26 The first insulating layer 20 extends from the second portion 107 to the first surface 101 but not to the second portion 106 ; the second insulating layer 30 extends from the first portion 106 to the first surface 101 but not to the second portion 107 . At this time, the first direction X is perpendicular to the direction where the second portion 107 is located.

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

[0128] In some embodiments, see Fig.24 and Fig. 27 , the fourth adhesive portion 70 may also be disposed on the second surface 103, and may also be disposed 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 may also be disposed corresponding to the first insulating layer 20 and the second insulating layer 30 located on the second surface 103.

[0129] The manufacturing method of the above-mentioned battery 100 includes the following steps: providing an electrode assembly 10; pasting a first insulating layer 20 and a second insulating layer 30 on the electrode assembly 10; forming a first bonding portion 40 on the surface of the electrode assembly 10 by, for example but not limited to, screen printing, spray gun dispensing, etc.; placing the above-mentioned electrode assembly 10 provided with the first bonding portion 40, the first insulating layer 20, the second insulating layer 30 and the third insulating layer 17 in a shell 80; and then pressing the outer side of the shell 80 so that the first bonding portion 40 is bonded to the inner side of the shell 80.

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

[0131] The manufacturing method of the battery 100 may further include: before accommodating the electrode assembly 10 in the housing 80, a second bonding portion 50 may be formed on a 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, etc. After pressing the outer side of the housing 80, the second bonding portion 50 is bonded to the inner side of the housing 80.

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

[0133] The manufacturing method of the battery 100 may further include: before the electrode assembly 10 is placed in the housing 80, a fourth bonding portion 70 may be formed on the surface of the electrode assembly 10 by, for example, but not limited to, screen printing, spray gun dispensing, etc. After the outer side of the housing 80 is pressed, the fourth bonding portion 70 is bonded to the inner side of the housing 80.

[0134] The following is further described by using specific embodiments and comparative examples. The structure and model of the electrode assembly 10 used in each embodiment and comparative example are the same.

[0135] Comparative Example 1

[0136] See also Fig.28 The surface of the electrode assembly is not provided with an adhesive portion, and 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 extend from the first surface through the second portion to the second surface respectively to fix the electrode assembly. The housing (aluminum-plastic film) accommodates the electrode assembly and is fixed to the electrode assembly through the adhesive portion, and the electrolyte is injected and the housing is sealed to obtain a battery, and the battery is subjected to a formation treatment and then a standard charge and discharge process is performed to activate the battery capacity, and finally the battery is degassed to complete the preparation.

[0137] Comparative Example 2

[0138] See also Fig.29 The difference between Comparative Example 2 and Comparative Example 1 is that a bonding portion is provided on a first area of ​​the first surface of the electrode assembly located on a side of the first insulating layer and the second insulating layer away from the second portion.

[0139] Example 1

[0140] See also Fig.30 The difference between Example 1 and Comparative Example 2 is that the bonding portion is also arranged in a second area other than the area where the first insulating layer and the second insulating layer are provided and the first area on the first surface of the electrode assembly, that is, the second area includes the area between the first insulating layer and the second insulating layer, the area on the side of the first insulating layer away from the second insulating layer, and the area on the side of the second insulating layer away from the first insulating layer.

[0141] Example 2

[0142] See also Fig.31 The difference between Example 2 and Example 1 is that the bonding portion is also arranged at the junction of the surface of the first insulating layer facing away from the first surface and the first surface, the surface of the first insulating layer facing away from the first surface, the junction of the surface of the second insulating layer facing away from the first surface and the first surface, and the surface of the second insulating layer facing away from the first surface.

[0143] Example 3

[0144] See also Fig.32 , Example 3 is different from Comparative Example 2 in that the bonding portion is also arranged in a region of the first surface of the electrode assembly between the first insulating layer and the second insulating layer.

[0145] Example 4

[0146] See also Fig.33, Example 4 is different from Comparative Example 1 in that the bonding portion is only provided in a 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 battery thickness was measured after full charge; then the batteries were discharged to the cut-off voltage, and then charged to the limit voltage with a constant current and constant voltage of 0.8C, and the thickness of each area of ​​the battery was measured as the initial thickness (here, the thickness D1 of the area where the first insulating layer of the battery is provided, or the thickness D2 of the area where the second insulating layer of the battery is provided, and the thickness D3 of the area between the first insulating layer and the second insulating layer of the battery, see Fig.34 ; Wherein, the area measured for the battery of comparative example 1 without the first insulating layer and the second insulating layer corresponds to the area measured for the battery of comparative example / embodiment with the first insulating layer and the second insulating layer), and the difference between D3 and D1 or the difference between D3 and D2 △D is calculated and recorded in the following Table 1. Then the battery is cycled 700 times in a 0.8C / 1C charge and discharge mode, and the thickness of each area is measured again after 700 cycles, that is, the thickness after the cycle, and the difference between D3 and D1 or the difference between D3 and D2 △D is calculated and recorded in the following Table 1.

[0148] Table 1

[0149]

[0150]

[0151] From the above data, it can be seen that the first insulating layer and the second insulating layer can suppress the expansion of the battery. After the battery charge and discharge cycle, the deformation of the battery with the bonding portion between the first insulating layer and the second insulating layer is significantly smaller than the deformation of the battery without the bonding 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) in the connection area 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 to the limiting voltage at a current of 0.2C at room temperature, the batteries are subjected to a drop test, specifically: the batteries are fixed in a battery-specific drop test box by special glue, the robot arm grabs the drop test box with the battery and releases it to a marble slab at a height of 1.8m according to a preset drop method, wherein the preset drop method is to drop six times in each round in the order of the first surface facing down → the second surface facing down → the first part facing down → the third part facing down → the second part facing down → the fourth part facing down. After each round of falling, observe whether the battery surface (i.e., the aluminum-plastic film) is damaged, and measure the open circuit voltage of the battery. If the open circuit voltage of the battery is less than 3.0V, the battery fails. If the battery surface, i.e., the aluminum-plastic film, is damaged, the battery is also judged to be failed. In each round of each comparative example or embodiment, 5 batteries were tested and the average value was taken. The number of drop rounds when each battery failed, the failure reason and the damage of the battery when failed were recorded in Table 2.

[0153] Table 2

[0154]

[0155] From the above data, it can be seen that setting the adhesive portion in the area between the first insulating layer and the second insulating layer is more conducive to improving the battery drop failure than not setting the adhesive portion, thereby being more conducive to improving the safety of the battery. Secondly, setting the adhesive portion while setting the first insulating layer and the second insulating layer can improve the battery drop failure situation, which is conducive to improving the safety of the battery.

[0156] The battery of the present application has a first insulating layer and a second insulating layer on the surface of the electrode assembly, and a first bonding portion is provided between the first insulating layer and the second insulating layer. When the shell encapsulates the electrode assembly, the first bonding portion bonds the electrode assembly and the shell. When the battery is subjected to external force, it is beneficial to reduce damage to the shell by the electrode assembly, and at the same time, it is beneficial to protect the electrode assembly itself, thereby improving the safety of the battery and extending the service life of the battery.

[0157] In addition, for ordinary technicians in this field, various other corresponding changes and modifications can be made according to the technical concept of this application, and all these changes and modifications should fall within the protection scope of this application.

Claims

1. A battery comprising: An electrode assembly, comprising an outer surface, the outer surface comprising a first surface and a second surface disposed opposite to the first surface; A first insulating layer, disposed on the first surface; A second insulating layer, disposed on the first surface and spaced apart from the first insulating layer along a first direction, wherein the first direction is parallel to the first surface; as well as A first bonding portion, wherein the first bonding portion is disposed on the first surface and is located in a region between the first insulating layer and the second insulating layer; Wherein, the battery further comprises a third adhesive portion, the third adhesive portion is arranged on a surface of the first insulating layer away from the second surface, and extends to an area of ​​the first surface where the first insulating layer is not arranged; The battery further includes a shell, which wraps the electrode assembly, the first insulating layer, and the second insulating layer, and is bonded to the electrode assembly through the first bonding portion.

2. The battery according to claim 1, wherein An area of ​​an orthographic projection of the first bonding portion on the first surface is smaller than a total area of ​​an orthographic projection of the first insulating layer and the second insulating layer on the first surface.

3. The battery according to claim 2, wherein An area of ​​an orthographic projection of the first adhesive portion on the first surface is smaller than an area of ​​an orthographic projection of the first insulating layer on the first surface, and smaller than an area of ​​an orthographic projection of the second insulating layer on the first surface.

4. The battery according to claim 1, wherein Observed from a direction perpendicular to the first surface, the distance from the partial area where the first surface overlaps with the first insulating layer to the second surface is a first distance, the distance from the first adhesive portion to the second surface is a second distance, and the first distance is smaller than the second distance.

5. The battery according to 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 according to claim 4, wherein Observed from a direction perpendicular to the first surface, a distance from a partial region where the first surface overlaps with the second insulating layer to the second surface is a third distance, and the third distance is smaller than the second distance.

7. The battery according to claim 6, wherein The third distance is a distance from an end of the first surface corresponding to the second insulating layer to the second surface.

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

9. The battery according to claim 1, wherein A length of the first adhesive portion in the first direction is less than half a length of the first surface in the first direction.

10. The battery according to claim 1, wherein The first surface is provided with a first groove corresponding to the first adhesive portion, and the first adhesive portion is located in the first groove.

11. The battery according to claim 10, wherein There are two or more first bonding portions, and each of the first bonding portions is located in one of the first grooves.

12. The battery according to claim 1, wherein The battery further includes a second adhesive portion, which is disposed on a surface of the first insulating layer away from the second surface, and an area of ​​an orthographic projection of the second adhesive portion on the first surface is smaller than an area of ​​an orthographic projection of the first insulating layer on the first surface.

13. The battery according to claim 12, wherein The first bonding portions are distributed in a lattice, and / or the second bonding portions are distributed in a lattice.

14. The battery according to claim 12, wherein A second groove is formed on the surface of the first insulating layer corresponding to the second bonding portion, and each second bonding portion is located in the second groove.

15. The battery according to claim 1, wherein 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.

16. The battery according to 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 according to claim 16, wherein 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 at the first portion, and the first insulating layer and the second insulating layer extend to the second portion.

18. The battery according to claim 1, wherein The battery also includes a fourth adhesive portion, which is arranged on the first surface. The area of ​​the first surface where the fourth adhesive portion is provided is separated from the area of ​​the first surface where the first insulating layer and the second insulating layer are provided and the area of ​​the first surface 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.

19. The battery according to claim 18, wherein When viewed from a direction perpendicular to the first surface, the electrode assembly includes at least two fourth bonding portions having different shapes.

20. The battery according to claim 1, wherein The electrode assembly further includes a third insulating layer. The electrode assembly is a winding structure. The third insulating layer is disposed on the second surface and fixes the end of the outermost pole piece of the electrode assembly.

21. The battery according to claim 1, wherein The shell is bonded to the electrode assembly through the third bonding portion.

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