Batteries and their electronic devices

Abstract

The present application provides a battery and an electronic device thereof, the battery including a housing, an electrode assembly, a first adhesive member, and a second adhesive member. The electrode assembly includes a main body and a first metal portion protruding from the main body along a first direction. The main body includes a first protrusion, a first portion, and a second protrusion, which are connected in sequence. The first portion includes a first surface and a second surface arranged opposite to each other in the second direction. The first protrusion includes a third surface on the same side as the first surface, and a fourth surface arranged opposite to the third surface. The second protrusion includes a fifth surface on the same side as the first surface, and a sixth surface arranged opposite to the fifth surface. The first protrusion includes a seventh surface in the first direction. The first adhesive member bonds the first surface, the third surface, the seventh surface, the fourth surface, and the second surface. The second adhesive member bonds the first surface and the fifth surface, but does not bond the sixth surface. The battery of the present invention can effectively solve the problem of voltage drop caused by the shrinkage of the separator film during dropping.

Description

[Technical field]

[0001] The present application relates to the field of battery technology, and in particular to batteries and their electronic devices. [Background technology]

[0002] Secondary batteries (abbreviated as batteries) generally include three types: consumer batteries, power batteries, and storage batteries. Consumer batteries are generally applied to electronic devices such as mobile phones, video cameras, and laptops, power batteries are applied to electronic devices such as electric cars and electric bicycles, and storage batteries are applied to energy storage power plants. Regardless of whether they are consumer batteries, power batteries, or storage batteries, they generally include a housing and an electrode assembly. The electrode assembly includes a body including a first electrode sheet, a second electrode sheet, and a separator film. The body is filled with an electrolyte and is accommodated in an accommodation chamber formed in the housing.

[0003] The electrolyte in the battery usually contains a lithium salt, an organic solvent and an additive, a part of which is filled in the body and another part of which is in a free state in a receiving chamber formed in the housing. The electrolyte is an important component of the battery, and its composition and content have a significant effect on the performance of the battery, such as the capacity, cycle life and internal pressure of the battery.

[0004] At present, the main body of the battery is mainly divided into a laminated type and a wound type. The former is a combination of a plurality of laminates in which a first electrode sheet, a separator film, and a second electrode sheet are laminated in sequence. The latter is a combination of a first electrode sheet, a separator film, and a second electrode sheet laminated in sequence and wound up, and the outermost ring is usually converged with the separator film or the first electrode sheet. The first electrode sheet includes a first collecting fluid and a first active material layer provided on the first collecting fluid. The second electrode sheet includes a second collecting fluid and a second active material layer provided on the second collecting fluid. The first active material layer is intermittently or continuously applied to the first collecting fluid, and the second active material layer is intermittently or continuously applied to the second collecting fluid. The uncoated areas of the first collecting fluid and the second collecting fluid can be formed into a first metal part and a second metal part by dicing, respectively. Alternatively, the first metal part and the second metal part can be directly or indirectly welded to the first collecting fluid and the second collecting fluid, respectively.

[0005] With the development of modern society, many electronic devices are striving to become intelligent and multifunctional, and in order to meet the requirements for capacity and power and ensure sufficient usage time, secondary batteries need to have higher energy density and larger capacity, and at the same time, they need to meet high safety and excellent cycle performance. Therefore, in order to meet various performance requirements of secondary batteries, the industry has been conducting more in-depth research and exploration into the design of battery electric cells, battery structure and production process. Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present application is to provide a battery and an electronic device thereof that can balance battery performance such as electrolyte wettability and energy density, while improving safety issues caused by voltage drop failure due to separator contraction during dropping.

[0007] Voltage drop failure caused by the shrinkage of the separator film due to the battery being dropped is a common battery failure mode. At present, the most commonly used measures in the industry to solve the shrinkage of the separator film due to dropping are: 1) reducing the amount of electrolyte held in the battery and reducing the impact of the free electrolyte on the separator film to suppress the shrinkage of the separator film. However, reducing the amount of electrolyte held will affect the wettability of the electrolyte, affect the interface at the later stage of the battery cycle, leading to rapid decay of capacity, reducing the energy density, and greatly shortening the service life. 2) Using a high-viscosity separator film to increase the adhesive force between the separator film and the electrode sheet with a high-viscosity separator film, suppresses the shrinkage of the separator film, but the improvement effect is limited and the problem cannot be thoroughly solved. 3) Using multiple adhesive tapes on the electrode assembly, that is, adhering from one side of the electrode assembly to the other side of the opposite side, but this method can only achieve local area protection to prevent the impact of the electrolyte on the separator film, and can only improve the voltage drop failure to a certain extent, so the improvement effect is limited.

[0008] Based on this, the inventors of the present application investigated the shrinkage mechanism of the separator film and found that shrinkage of the separator film in the innermost layer of the electrode assembly is mainly located at the first convex portion of the battery cell, and shrinkage of the separator film in the outermost layer is mainly located at the first convex portion and the second convex portion on the first surface side of the electrode assembly. The first and second convex portions on the first surface side will cause the electrode sheet to separate due to the impact of the electrolyte and wear due to friction between the housing and the first electrode sheet in the outermost layer, exposing the collector. In this case, when the separator film shrinks, the first collector will come into contact with the second electrode sheet installed opposite, causing a short circuit between the first collector and the second electrode sheet, resulting in a large instantaneous voltage drop, excessive heat generation, and safety risks. [Means for solving the problem]

[0009] Based on the above-mentioned mechanism study, the battery according to the present application includes a housing with a receiving chamber, an electrode assembly, a first adhesive member, and a second adhesive member. The electrode assembly includes a body portion, a first metal portion, and a second metal portion electrically opposite to the first metal portion, and the body portion is received in the receiving chamber. The first metal portion and the second metal portion are both electrically connected to the body portion, protrude from the body portion along a first direction, and extend outside the housing. The body portion includes a first electrode sheet, a second electrode sheet, and a separator film provided between the first electrode sheet and the second electrode sheet. In the first direction, the first electrode sheet and the second electrode sheet are provided so as to overlap each other, or both sides of the second electrode sheet are both beyond the first electrode sheet. Along the first direction, the body portion includes a first convex portion, a first portion, and a second convex portion connected in sequence, and the first convex portion and the second convex portion are formed by the portions of two edges of the separator film provided opposite to each other along the first direction that exceed the edges of the second electrode sheet. The thickness direction of the electrode assembly is defined as the second direction, and the second direction is perpendicular to the first direction. The first portion includes a first surface and a second surface arranged opposite to each other in the second direction. The first convex portion includes a third surface on the same side as the first surface and a fourth surface arranged opposite to the third surface. The second convex portion includes a fifth surface on the same side as the first surface and a sixth surface arranged opposite to the fifth surface. The first convex portion further includes a seventh surface in the first direction. The first metal portion is located at a middle position of the electrode assembly or at a position closer to the fifth surface in the second direction. The first adhesive member bonds the first surface, the third surface, the seventh surface, the fourth surface, and the second surface. The second adhesive member bonds the first surface and the fifth surface, but does not bond the sixth surface.

[0010] In the present application, the first adhesive member is adhered to all of the first, third, seventh, fourth and second surfaces. That is, the separator film of each layer of the first protrusion of the main body of the electrode assembly is adhered. This prevents and suppresses the electrolyte from directly impacting the separator film, and furthermore, avoids the loss of voltage drop caused by the innermost and outermost separator films of the main body shrinking at the first protrusion. In addition, the second adhesive member is adhered to the first and fifth surfaces, but the second adhesive member is not adhered to the sixth surface. This corresponds to adhering the outermost separator film on the fifth surface of the main body, and not only can it prevent wear of the first electrode sheet of the outermost layer close to the fifth surface S5 of the main body, but it can also suppress the impact of the electrolyte on the separator film. Therefore, it is possible to avoid the loss of voltage drop caused by the shrinkage of the outermost separator film of the main body on the fifth surface. Therefore, the present application starts from the shrinkage mechanism of the separator film, and by installing a first adhesive member and a second adhesive member corresponding to the separator film that is prone to shrinkage, it is possible to fundamentally and effectively solve the problem of voltage drop caused by the shrinkage of the separator film during the drop process, while at the same time balancing battery performance such as electrolyte permeability and energy density.

[0011] In one embodiment, the first adhesive member sequentially adheres the first surface, the third surface, the seventh surface, the fourth surface, and the second surface.

[0012] In one embodiment, an edge of the second adhesive member does not extend beyond an edge of the separator film in the first direction.

[0013] In one embodiment, a third direction is defined as being orthogonal to the first direction and the second direction, and in the third direction, the dimension of the main body is W, the dimension of the first adhesive member is W1, and the dimension of the second adhesive member is W2, where 0.7W≦W1≦W and / or 0.7W≦W2≦W. Furthermore, 0.8W≦W1≦0.9W and / or 0.8W≦W2≦0.9W.

[0014] In one embodiment, a third direction is defined as being perpendicular to the first direction and the second direction, and when viewed from the second direction, the third surface includes a first arcuate region, a first region, and a second arcuate region that are successively connected in the third direction, and the first adhesive member bonds the first region and at least one of the first arcuate region and the second arcuate region.

[0015] In one embodiment, a third direction is defined as being perpendicular to the first direction and the second direction, and when viewed from the second direction, the fifth surface includes a third arcuate region, a second region, and a fourth arcuate region that are successively connected in the third direction, and the second adhesive member bonds the second region and at least one of the third arcuate region and the fourth arcuate region.

[0016] As an example, at least one first through hole is provided in the portion where the first adhesive member and the seventh surface are adhered to each other.

[0017] In one embodiment, the diameter d2 of the first through holes is between 0.5 mm and 2 mm, and / or the distance d3 between adjacent first through holes is between 1 mm and 4 mm.

[0018] In one embodiment, at least one second through hole is provided in the portion where the first adhesive member and the first surface are bonded, and the aperture ratio per unit area of ​​the portion where the first adhesive member and the first surface are bonded is smaller than the aperture ratio per unit area of ​​the portion where the first adhesive member and the seventh surface are bonded.

[0019] In one embodiment, at least one third through hole is provided in the portion where the first adhesive member and the second surface are bonded, and the aperture ratio per unit area of ​​the portion where the first adhesive member and the second surface are bonded is smaller than the aperture ratio per unit area of ​​the portion where the first adhesive member and the seventh surface are bonded.

[0020] As one embodiment, at least one of a portion where the first adhesive member and the first surface are adhered to each other and a portion where the first adhesive member and the second surface are adhered to each other has no through-hole.

[0021] In one embodiment, a third direction is defined as being perpendicular to the first direction and the second direction, and the first adhesive member includes a plurality of first sub-adhesive members distributed at intervals in the third direction.

[0022] In one embodiment, the body has a rolled or laminated structure.

[0023] In one embodiment, the first electrode sheet includes a first collecting fluid, and the first surface includes a surface of at least a portion of the first collecting fluid.

[0024] In one embodiment, the first electrode sheet is a cathode sheet.

[0025] In one embodiment, the housing is a package having a multi-layer structure, and the package includes a metal foil and a polyolefin resin layer disposed on both sides of the metal foil.

[0026] As an example, the second convex portion has an eighth surface in the first direction. The main body portion is not provided with an adhesive member that sequentially bonds the fifth surface, the eighth surface, and the sixth surface.

[0027] In one embodiment, a third adhesive member is provided between the housing and the electrode assembly, one surface of the third adhesive member being adhered to the housing and the other surface of the third adhesive member being adhered to the first surface or the second surface.

[0028] The present application also provides an electronic device comprising the battery described above. The electronic device can be an electronic product such as a mobile phone, a video camera, a laptop, a drone, an electric car, an electric bicycle, an energy storage power station, etc. [Brief description of the drawings]

[0029] [Figure 1]1 is a schematic diagram of an electronic device according to an embodiment of the present application. [Diagram 2] 1 is a perspective view of a battery according to a first embodiment of the present application; [Diagram 3] FIG. 2 is a perspective view of a battery according to a second embodiment of the present application. [Figure 4] FIG. 2 is a perspective view of the electrode assembly of the battery according to the first embodiment of the present application when no adhesive member is provided. [Diagram 5] FIG. 5 is a graph showing the change in FIG. [Figure 6] 5 is a perspective view of the electrode assembly of FIG. 4 after an adhesive member has been provided. [Figure 7] FIG. 7 is an enlarged plan view of the electrode assembly in FIG. [Figure 8] FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. [Figure 9] FIG. 7 is an enlarged view of a portion indicated by D in FIG. [Figure 10] FIG. 7 is an enlarged view of a portion indicated by E in FIG. [Figure 11] FIG. 9 is an enlarged view of a portion indicated by F in FIG. 8. [Figure 12] 11 is a perspective partial cross-sectional view of an electrode assembly of a battery according to a second embodiment of the present invention in which no adhesive member is provided. FIG. [Figure 13] FIG. 13 is a perspective view of the electrode assembly of FIG. 12 after an adhesive member has been provided. [Figure 14] FIG. 14 is an enlarged view of a portion indicated by G in FIG. [Figure 15] FIG. 7 is a front schematic view of the electrode assembly of FIG. 6. [Figure 16] FIG. 7 is a schematic rear view of the electrode assembly of FIG. 6. [Figure 17] FIG. 7 is a schematic plan view of the electrode assembly of FIG. 6. [Figure 18] FIG. 7 is a schematic bottom view of the electrode assembly of FIG. 6. [Figure 19] FIG. 16 is a diagram showing a change state of FIG. 15. [Figure 20] FIG. 17 is a diagram showing a change state of FIG. 16. [Figure 21]16 is a schematic diagram showing another change state of FIG. 15. FIG. [Figure 22] FIG. 17 is a schematic diagram showing another change state of FIG. 16. [Diagram 23] FIG. 16 is a schematic diagram showing a further variation of FIG. [Figure 24] FIG. 17 is a schematic diagram showing a further variation of FIG. [Diagram 25] FIG. 16 is a schematic diagram showing a further variation of FIG. [Figure 26] FIG. 17 is a schematic diagram showing a further variation of FIG. [Figure 27] FIG. 16 is a schematic diagram showing a further variation of FIG. [Figure 28] FIG. 17 is a schematic diagram showing a further variation of FIG. [Figure 29] FIG. 16 is a schematic diagram showing a further variation of FIG. [Diagram 30] FIG. 17 is a schematic diagram showing a further variation of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] In order to better explain the purpose, technical proposal and beneficial effects of the present application, the present application will be further described below in conjunction with specific examples. Note that the following embodiments are for further interpretation of the present application and should not be regarded as limitations on the present application.

[0031] The battery of the present application mainly solves the problem of voltage drop failure caused by the shrinkage of the separator film during the dropping process, which not only effectively solves the voltage drop failure caused by the shrinkage of the separator film during the dropping process, but also balances the battery performance such as electrolyte wettability and energy density, so as to meet the requirements of various electronic devices (mobile phone 100 shown in FIG. 1). The present invention can be applied to various types of batteries, for example, hard shell batteries of large electronic products such as drones, power tools, energy storage devices, etc., or soft pack batteries of consumer electronic products such as mobile phones, video cameras, and laptops.

[0032] A hard shell battery 10 typically includes a housing 1, an electrode assembly 2, and a cover 3 (shown in FIG. 2) that seals the housing 1. The electrode assembly 2 includes a body portion 21, a first metal portion 31, and a second metal portion 33 that are accommodated in a storage chamber formed in the housing 1. The first metal portion 31 and the second metal portion 33 are both provided on the cover 3 and protrude outside the housing 1. The first metal portion 31 and the second metal portion 33 usually need to be connected to the body portion 21 via a connection piece 4. The housing 1 is usually made of a sheet material of metal aluminum, stainless steel, or magnesium alloy that is stretch-formed. A soft-pack battery 10 includes a housing 1 and an electrode assembly 2 (shown in FIGS. 3 to 5), and the electrode assembly 2 includes a body portion 21, a first metal portion 31, and a second metal portion 33 that are accommodated in a storage chamber formed in the housing 1. The first metal portion 31 and the second metal portion 33 may be directly connected to the body portion 21, or may be connected to the body portion 21 via an adapter sheet. The main difference between the hard-shell battery 10 and the soft-pack battery 10 lies in the size of the housing 1 and the electrode assembly 2. The former housing 1 is usually an aluminum shell, a stainless steel shell or a magnesium alloy shell, while the latter housing 1 is usually a three-layer structure with a metal foil as the middle layer and polymer layers on both sides. The material of the metal foil may be aluminum, steel, titanium, alloy, etc. The strength of the housing 1 of the soft-pack battery 10 is lower than that of the hard-shell battery 10, and there is a high risk of the separator film shrinking due to dropping, so the soft-pack battery 10 is taken as an example to explain the technical effects of the present application.

[0033] The electrode assembly 2 of the soft-pack battery 10 includes a main body 21 consisting of a first electrode sheet 211, a second electrode sheet 213, and a separator film 215 provided between the first electrode sheet 211 and the second electrode sheet 213. The main body 21 may have a rolled structure as shown in Figs. 4 to 7, or may have a laminated structure as shown in Figs. 12 to 13. The former is formed by sequentially stacking the first electrode sheet 211, the separator film 215, and the second electrode sheet 213 and rolling them up. The latter is formed by re-stacking a plurality of laminates in which the first electrode sheet 211, the separator film 215, and the second electrode sheet 213 are sequentially stacked.

[0034] First, in this application, a soft-pack battery 10 having a winding structure will be described as an example. As shown in Figs. 4 to 8, the first electrode sheet 211 includes a first collecting layer 2111 and a first active material layer 2113 provided on the first collecting layer 2111, and the first collecting layer 2111 is provided with a first tab 2115 at the winding start end. The second electrode sheet 213 includes a second collecting layer 2131 and a second active material layer 2133 provided on the second collecting layer 2131, and the second collecting layer 2131 is provided with a second tab 2135 at the winding start end. The first tab 2115 is welded to the first metal part 31, and the first metal part 31 is provided with a tab sealing rubber 70. The first metal part 31 protrudes from the main body part 21 along the first direction A and protrudes outside the housing 1. The second tab 2135 is welded to the second metal part 33, and the second metal part 33 is provided with a tab sealing rubber 70. The second metal part 33 protrudes from the main body part 21 along the first direction A and protrudes outside the housing 1. Furthermore, as shown in FIG. 7, the first collecting layer 2111 converges at the winding end. Specifically, the first active material layer 2113 is first provided on both sides of the first collecting layer 2111 of the first electrode sheet 211, and after multiple windings, the first active material layer 2113 is provided on one side, and after one winding, the first collecting layer 2111 is terminated with the first collecting layer 2111 without the first active material layer 2113. As shown in FIG. 8, in the first direction A, both sides of the second electrode sheet 213 exceed the first electrode sheet 211. The first electrode sheet 211 may be a cathode sheet or an anode sheet. Correspondingly, the second electrode sheet 213 may be either an anode sheet or a cathode sheet.

[0035] Continuing to refer to FIGS. 4 to 8, the thickness direction of the electrode assembly 2 is defined as the second direction B, the second direction B is perpendicular to the first direction A, and the third direction C is perpendicular to the first direction A and the second direction B. Along the first direction A, the main body portion 21 includes a first protrusion 221, a first portion 223, and a second protrusion 225, which are connected in sequence. The first protrusion 221 and the second protrusion 223 are formed by portions of two edges of the separator film 215 that are provided opposite to each other in the first direction A, which extend beyond the edges of the second electrode sheet 211. The first portion 223 includes a first surface S1 and a second surface S2 that are provided opposite to each other in the second direction B, and the first surface S1 and the second surface S2 constitute the main body surface of the main body portion 21. The first protrusion 221 includes a third surface S3 on the same side as the first surface S1 and a fourth surface S4 disposed opposite the third surface S3, and the first protrusion 221 includes a seventh surface S7 in the first direction A. The second protrusion 225 includes a fifth surface S5 on the same side as the first surface S1 and a sixth surface S6 provided opposite the fifth surface S5, and the second protrusion 225 includes an eighth surface S8 in the first direction A. When viewed from the second direction B, the third surface S3 includes a first arc surface region S31, a first region S33, and a second arc surface region S35 that are sequentially connected in the third direction C. The fifth surface S5 includes a third arc surface region S51, a second region S53, and a fourth arc surface region S55 that are sequentially connected in the third direction C. As shown in FIG. 4 and FIG. 6 to FIG. 7, the first metal portion 31 is located in the middle of the electrode assembly 2 in the second direction B. Of course, in the second direction B, the first metal portion 31 does not have to be located at the middle portion of the electrode assembly 2, and may be located adjacent to the fifth surface S5 of the body portion 21, for example, as shown in FIG. 5. The specific position of the first metal portion 31 is determined according to the needs of the battery terminal. Also, as shown in FIG. 7, the first surface S1 includes at least a part of the surface of the first collecting layer 2111, since the first collecting layer 2111, which is not provided with the first active material layer 2113, converges.

[0036] 6 to 9 and 13 to 30, a first adhesive member 51 is adhered to the first surface S1, the third surface S3, the seventh surface S7, the fourth surface S4, and the second surface S2. This corresponds to adhering the separator film 215 of each layer to the first protruding portion 221 of the main body portion 21, and prevents and suppresses the electrolyte from directly impacting the separator film 215, and further prevents the voltage drop caused by the innermost and outermost separator films 215 of the main body portion 21 contracting to the first protruding portion 221. A second adhesive member 53 is adhered to the first surface S1 and the fifth surface S5, but the second adhesive member 53 is not adhered to the sixth surface S6. This is equivalent to adhering the outermost separator film 215 to the fifth surface S5 of the main body part 21, and not only can it prevent wear of the outermost first electrode sheet 211 close to the fifth surface S5 of the main body part 21, but it can also suppress the impact of the electrolyte on the separator film 215. Therefore, it is possible to avoid the loss of voltage drop caused by the contraction of the outermost separator film 215 of the main body part 21 on the fifth surface S5.

[0037] Based on the first adhesive member 51, as shown in FIG. 7, its dimension in the third direction C is defined as W1, and the dimension of the main body 21 in the third direction C is defined as W, and both satisfy 0.7W≦W1≦W. By installing in this manner, the first adhesive member 51 has an appropriate contact dimension with the separator film 215 in the third direction C, the adhesive force between the first adhesive member 51 and the separator film 215 is increased, the risk of the separator film 215 shrinking is reduced, and safety can be improved. Furthermore, by setting 0.8W≦W1≦0.9W, when utilizing the good adhesive effect between the first adhesive member 51 and the separator film 215, the risk of defects of the first adhesive member 51 installed in the third direction C due to variations in the manufacturing process when manufacturing the electrode assembly 2 can be reduced. In the configuration, as shown in FIGS. 6 to 9 and 15 to 17, the first surface S1, the third surface S3, the seventh surface S7, the fourth surface S4, and the second surface S2 are adhered in this order. As shown in Figs. 6 to 7 and 9, the first region S33 of the third surface S3 may be bonded, and at least one of the first arc surface region S31 and the second arc surface region S35 may be bonded. As shown in Figs. 21 to 24, the first adhesive member 51 may include two first sub-adhesives, such as the first sub-adhesive 51A and the first sub-adhesive 51B, that are spaced apart in the third direction C. The gap d1 between the first sub-adhesive 51A and the first sub-adhesive 51B in the third direction C is 0 mm to 4 mm. This allows the first sub-adhesive 51A and the first sub-adhesive 51B to have an appropriate gap in the third direction C, and the adhesive effect with the separator film 215 is ideal. The first sub-adhesive 51A and the first sub-adhesive 51B bond the first surface S1, the third surface S3, the seventh surface S7, the fourth surface S4, and the second surface S2 in sequence. Of course, the number of first sub-adhesives may be at least 2, or may be 3, 4, or another number. The dimension W3 in the first direction A of the first adhesive member 51, the first sub-adhesive 51A, and the first sub-adhesive 51B is 8 mm to 12 mm, which provides a good adhesive effect between the first sub-adhesive 51A and the first sub-adhesive 51B and the electrode assembly 2, maintains the adhesive strength, reduces the risk of falling off during manufacture or use, and reduces the impact on the dimension in the second direction B of the soft-pack battery 10.

[0038] The first adhesive member 51 may be a single layer of adhesive paper, or may be a multi-layered adhesive paper that is stacked to ensure adhesion. When the multiple layers are stacked, each through hole needs to correspond one-to-one to ensure the penetration of the electrolyte. In addition, the first adhesive member 51 is usually an adhesive paper including a base material and an adhesive layer. The base material is generally one or more of polyethylene terephthalate (PET), oriented polypropylene (PP), and polyimide (PI). The material of the adhesive layer is generally a polymer material that swells in an organic solvent in the electrolyte, such as acrylic resin, thermosetting polyurethane, organic silica gel, natural rubber, synthetic rubber, etc.

[0039] It is further necessary to explain that, as shown in FIG. 18, at least one first through hole 61 is provided in the portion where the first adhesive member 51 and the seventh surface S7 are bonded. By providing the first through hole 61, it is possible to increase the infiltration of the electrolyte. In addition, the diameter d2 of the first through hole 61 is 0.5 mm to 2 mm, and the distance d3 between the adjacent first through holes 61 is 1 mm to 4 mm, which allows the battery 10 to have a good electrolyte infiltration effect and good adhesion performance to the separator film 215. Furthermore, as shown in FIGS. 19, 23, and 29, at least one second through hole 63 may be provided in the portion where the first adhesive member 51 and the first surface S1 are bonded. The diameter d4 of the second through holes 63 is 0.5 mm to 2 mm, and the distance d5 between adjacent second through holes 63 is 1 mm to 4 mm, which allows good adhesive strength between the first adhesive member 51 and the first surface S1 to be maintained and allows the amount of electrolyte stored to be increased through the second through holes 63. The aperture ratio per unit area of ​​the portion where the first adhesive member 51 and the first surface S1 are bonded is smaller than the aperture ratio per unit area of ​​the portion where the first adhesive member 51 and the seventh surface S7 are bonded (however, the area of ​​the outline of the portion where the first adhesive member 51 and each surface are bonded is S, the sum of the areas of the through holes in the bonded portion is Sm, and the aperture ratio per unit area = Sm / S x 100%. Taking FIG. 19 as an example, the aperture ratio per unit area of ​​the portion where the first adhesive member 51 and the first surface S1 are bonded = 7πd4 220, 24, and 30, at least one third through hole 65 is provided in the portion where the first adhesive member 51 and the second surface S2 are bonded. The diameter d6 of the third through hole 65 is 0.5 mm to 2 mm, and the distance d7 between adjacent third through holes 65 is 1 mm to 4 mm. The aperture ratio per unit area of ​​the portion where the first adhesive member 51 and the second surface S2 are bonded is smaller than the aperture ratio per unit area of ​​the portion where the first adhesive member 51 and the seventh surface S7 are bonded. Of course, as shown in FIGS. 15 to 16, 21 to 22, and 25 to 28, at least one of the portion where the first adhesive member 51 and the first surface S1 are bonded and the portion where the first adhesive member 51 and the second surface S2 are bonded does not have to have a through hole. By not opening through holes on the main body surface of the main body part 21, it is advantageous for an adhesive applicator to attach both ends of the first adhesive member 51 while adsorbing them during the manufacturing process. On the other hand, it is possible to prevent free electrolyte from passing through the through holes on the main body surface to swell the polymer material of the adhesive layer in the first adhesive member 51, causing the adhesive layer to overflow from the edge of the through holes, and bonding the overflowing adhesive layer to the main body surface of the main body part 21 and the housing 1 during pressurization in battery manufacturing or during pressure application after use. In addition, during mechanical abuse (e.g., falling), the housing 1 pulls the main body surface of the main body part 21, generating a large acting force and causing the main body surface to tear. If the main body surface of the main body part 21 is a cathode collector not coated with an active material, the tearing may cause it to come into contact with the active material layer and cause a short circuit.

[0040] Based on the second adhesive member 53, as shown in FIG. 7, its dimension in the third direction C is defined as W2, which satisfies 0.7W≦W2≦W with the dimension W of the main body 21 in the third direction C. By installing in this manner, the second adhesive member 53 has an appropriate contact dimension with the separator film 215 in the third direction C, and the adhesive force between the second adhesive member 53 and the separator film 215 is increased, the risk of the separator film 215 shrinking is reduced, and safety can be improved. Furthermore, if 0.8W≦W2≦0.9W, when utilizing the good adhesive effect between the second adhesive member 53 and the separator film 215, the risk of defects of the second adhesive member 53 installed in the third direction C due to the variation in the manufacturing process during the manufacture of the electrode assembly 2 can be reduced. The structure is as shown in FIGS. 6, 8, and 10-11, and in the first direction A, the edge of the second adhesive member 53 does not exceed the edge of the separator film 215. That is, a part of the fifth surface S5 can be exposed in the first direction A. 6 to 8 and 11, the first collector 2111 without the first active material layer 2113 is completed, and the second adhesive member 53 may be sequentially attached to the first collector 2111, a part of the separator film that does not extend beyond the edge of the second electrode sheet 213 (part A shown in FIG. 11), and a part of the separator film that extends beyond the edge of the second electrode sheet 213 (part B shown in FIG. 11). Since the first active material layer 2113 is not provided on the surface of the first collector 2111 of the outermost ring of the winding that faces the first adhesive member 53, the thickness of the first active material layer 2113 that does not exhibit capacity can be reduced, and the energy density can be increased. In addition, by using the first electrode sheet 211 as the cathode sheet and the second electrode sheet 213 as the anode sheet, the second adhesive member 53 can adhere a portion of the separator film that does not extend beyond the edge of the second electrode sheet 213 (anode sheet) in the first direction A, which can prevent a short circuit caused by contact between the anode sheet and the cathode collector when the separator film 215 shrinks, and thus has a superior shrinkage prevention effect. In the first direction A, the dimension of the second adhesive member 53 is W4, which is 5 mm≦W4≦20 mm.Setting this parameter range not only provides a protective effect for the outermost separator film 315, but also prevents excessive spatial occupancy. As shown in Figures 6 and 10, the second adhesive member 53 may adhere the second region S53 of the fifth surface S5, and may also adhere at least one of the third arcuate region S51 and the fourth arcuate region S55. The second adhesive member 53 may be a single layer of adhesive paper, or may be a multi-layer adhesive paper that is overlapped to ensure adhesion.

[0041] Furthermore, as shown in Figs. 25 to 28, a third adhesive 55 is provided between the housing 1 and the electrode assembly 2. One side of the third adhesive 55 is adhered to the housing 1, and the opposite side is adhered to the first surface S1 (shown in Fig. 25) or the second surface S2 (shown in Fig. 28). For the surface of the electrode assembly 2 on which the third adhesive 55 is not provided, the housing 1 and the electrode assembly 2 are relatively movable, so that the diaphragm contracts even during abuse. On the other hand, by adhering the first adhesive member 51 to any of the first surface S1, the third surface S3, the seventh surface S7, the fourth surface S4, and the second surface S2, and adhering the second adhesive member 53 to the first surface S1 and the fifth surface S5, the problem of separator film contraction due to abuse can be solved.

[0042] Furthermore, as shown in Figs. 29-30, the main body 21 is provided with a fourth adhesive 57 between the first metal part 31 and the second metal part 33. The fourth adhesive 57 bonds the first surface S1, the fifth surface S5, the eighth surface S8, the sixth surface S6, and the second surface S2 in that order. The dimension W5 of the fourth adhesive 57 in the third direction C is 5 mm to 20 mm, and the dimension W6 in the first direction A is 6 mm to 12 mm. Of course, when the distance between the first metal part 31 and the second metal part 33 is small, the main body 21 does not need to be provided with the fourth adhesive 57 that bonds the fifth surface S5, the eighth surface S8, and the sixth surface S6 in that order, as shown in Figs. 15-28. Here, the fourth adhesive 57 may be a single layer of adhesive paper, or may be a multi-layer adhesive paper that is superimposed to ensure adhesion.

[0043] Next, a soft-pack battery 10 having a further laminated structure will be described as an example. As shown in FIG. 3 and FIGS. 12-13, each of the first electrode sheets 211 and the second electrode sheets 213 is covered with a separator film 215. The first electrode sheet 211 includes a first fluid collecting layer 2111 and a first active material layer 2113 provided on the first fluid collecting layer 2111. The first active material layer 2113 completely covers the first fluid collecting layer 2111, and a first tab 2115 is connected to the first fluid collecting layer 2111. The second electrode sheet 213 includes a second fluid collecting layer 2131 and a second active material layer 2133 provided on the second fluid collecting layer 2131. The second active material layer 2133 completely covers the second fluid collecting layer 2131, and a second tab 2135 is connected to the second fluid collecting layer 2131. After the multiple first tabs 2115 are laminated, the first metal part 31 is welded. The first metal portion 31 protrudes from the main body portion 21 along the first direction A and extends outside the housing 1. After the multiple second tabs 2135 are stacked, the second metal portion 33 is welded. The second metal portion 33 protrudes from the main body portion 21 along the first direction A and extends outside the housing 1.

[0044] 3 and 12-13, the main body 21 includes a first protrusion 221, a first portion 223, and a second protrusion 225, which are connected in sequence along the first direction A. The first protrusion 221 and the second protrusion 225 are formed by portions of two edges of the separator film 215 that are provided opposite to each other in the first direction A, which extend beyond the edge of the second electrode sheet 213. The first portion 223 includes a first surface S1 and a second surface S2 that are provided opposite to each other in the second direction B. The first protrusion 221 includes a third surface S3 on the same side as the first surface S1, and a fourth surface S4 that is disposed opposite to the third surface S3. The first protrusion 221 includes a seventh surface S7 in the first direction A. The second protrusion 225 includes a fifth surface S5 on the same side as the first surface S1, and a sixth surface S6 that is provided opposite to the fifth surface S5. The second convex portion 225 has an eighth surface S8 in the first direction A. In the second direction B, the first metal portion 31 is located at the middle position of the electrode assembly 2.

[0045] 13-14, the first adhesive member 51 is adhered to the first surface S1, the third surface S3, the seventh surface S7, the fourth surface S4, and the second surface S2. This corresponds to adhering the separator film 215 of each layer to the first protruding portion 221 of the main body portion 21, and prevents and suppresses the electrolyte from directly impacting the separator film 215, and further solves the problem of voltage drop failure caused by contraction at the first protruding portion 221 of the separator film 215 of the innermost and outermost layers of the main body portion 21. The second adhesive member 53 is adhered to the first surface S1 and the fifth surface S5, but the second adhesive member 53 is not adhered to the sixth surface S6. This corresponds to adhering the outermost separator film 215 to the fifth surface S5 of the main body portion 21, and not only prevents wear of the first electrode sheet 211 of the outermost layer close to the fifth surface S5 of the main body portion 21, but also suppresses impact of the electrolyte on the separator film 215. This solves the problem of voltage drop caused by contraction of the separator film 215 of the outermost layer of the body portion 21 at the fifth surface S5. For a battery with a laminated structure, the boundary between the innermost layer and the outermost layer depends on the position of the first metal portion 31 in the second direction B. When the first metal portion 31 is located at the middle position of the electrode assembly 2 in the second direction B, the outermost layer tends to be on the cathode sheet side. When the first metal portion 31 is not located at the middle position of the electrode assembly 2 in the second direction B, the outermost layer leans towards the fifth surface side.

[0046] Based on the first adhesive member 51, the dimension in the third direction C is defined as W1, and the dimension in the third direction C of the main body portion 21 is defined as W, and both satisfy 0.7W≦W1≦W, and further 0.8W≦W1≦0.9W, and as shown in the drawings, W1=W. In the structure, as shown in Figs. 13-14, the first surface S1, the third surface S3, the seventh surface S7, the fourth surface S4, and the second surface S2 are bonded in sequence. The dimension W3 of the first adhesive member 51 in the first direction A is 8mm to 12mm. As with the soft-pack battery, in the battery with the laminated structure, a through hole may be provided in at least one of the portion where the first adhesive member 51 and the seventh surface S7 are bonded, the portion where the first adhesive member 51 and the first surface S1 are bonded, and the portion where the first adhesive member 51 and the second surface S2 are bonded, or none of them may have a through hole. The first adhesive member 51 may be a single layer of adhesive paper, or may be multiple layers of adhesive paper that are overlapped to ensure adhesion.

[0047] Based on the second adhesive member 53, its dimension in the third direction C is defined as W2, which satisfies 0.7W≦W2≦W with the dimension W of the main body 21 in the third direction C, and preferably 0.8W≦W2≦0.9W. As shown in the drawing, W2=W. The dimension of the second adhesive member 53 in the first direction A is W4, which is 5mm≦W4≦20mm. When set in this parameter range, it not only provides a protective effect for the outermost separator film 315, but also does not occupy the spatial dimension excessively. As shown in FIG. 13, the edge of the structure does not exceed the edge of the separator film 215 in the first direction A. That is, a part of the fifth surface S5 can be exposed in the first direction A. The second adhesive member 53 may be a single layer of adhesive paper, or may be a multi-layer adhesive paper that is overlapped to ensure adhesion.

[0048] To further explain that the battery of the present application can effectively solve the problem of voltage drop caused by separator contraction during dropping, examples of soft-pack batteries will be described in detail. Here, Examples 1 to 3 are electrode assemblies employing the structures shown in Figures 21 and 22, and Comparative Examples 1 to 3 employ a conventional electrode assembly (in which the first adhesive member 51 sequentially bonds the first surface S1, the third surface S3, the seventh surface S7, the fourth surface S4, and the second surface S2, and the second adhesive member 53 sequentially bonds the first surface S1, the fifth surface S5, the eighth surface S8, the sixth surface S6, and the second surface S2).

[0049] Example 1 The dimension L of the main body 21 in the first direction A is 91 mm, the dimension in the second direction B is 6 mm, and the dimension W in the third direction C is 66 mm. The first adhesive member 51 employs one first sub-adhesive 51A and one first sub-adhesive 51B, and distributes them symmetrically in the middle. The dimension W3 of the first sub-adhesive 51A and the first sub-adhesive 51B in the first direction A is 12 mm. The gap d1 between the first sub-adhesive 51A and the first sub-adhesive 51B is 3 mm. A first through hole 61 is provided in the portion where the first sub-adhesive 51A, the first sub-adhesive 51B, and the seventh surface S7 are bonded. The diameter d2 of the first through hole 61 is 1 mm, and the distance d3 between adjacent first through holes 61 is 1.5 mm. The second adhesive member 53 has a dimension W2 in the third direction C of 66 mm, a dimension W4 in the first direction A of 8 mm, and a dimension in the second direction B of 20 μm.

[0050] <Comparative Example 1> The main body 21 has a dimension L of 91 mm in the first direction A, a dimension of 6 mm in the second direction B, and a dimension W of 66 mm in the third direction C. The first adhesive member 51 employs one first sub-adhesive 51A and one first sub-adhesive 51B, and distributes them symmetrically in the middle. The dimension W3 of the first sub-adhesive 51A and the first sub-adhesive 51B in the first direction A is 12 mm. The gap d1 between the first sub-adhesive 51A and the first sub-adhesive 51B is 3 mm. A first through hole 61 is provided in the portion where the first sub-adhesive 51A, the first sub-adhesive 51B, and the seventh surface S7 are bonded. The diameter d2 of the first through hole 61 is 1 mm, and the distance d3 between adjacent first through holes 61 is 1.5 mm. The second adhesive member 53 has a dimension W2 in the third direction C of 13 mm, a dimension W4 in the first direction A of 8 mm, and a dimension in the second direction B of 20 μm.

[0051] Example 2 The main body 21 has a dimension L of 78 mm in the first direction A, a dimension of 5.4 mm in the second direction B, and a dimension W of 65 mm in the third direction C. The first adhesive member 51 employs one first sub-adhesive 51A and one first sub-adhesive 51B, and distributes them symmetrically in the middle. The dimension W3 of the first sub-adhesive 51A and the first sub-adhesive 51B in the first direction A is 12.3 mm. The gap d1 between the first sub-adhesive 51A and the first sub-adhesive 51B is 3 mm. A first through hole 61 is provided in the portion where the first sub-adhesive 51A, the first sub-adhesive 51B, and the seventh surface S7 are bonded. The diameter d2 of the first through hole 61 is 1 mm. The distance d3 between adjacent first through holes 61 is 1.5 mm. The second adhesive member 53 has a dimension W2 in the third direction C of 65 mm, a dimension W4 in the first direction A of 8 mm, and a dimension in the second direction B of 20 μm.

[0052] <Comparative Example 2> The main body 21 has a dimension L of 78 mm in the first direction A, a dimension of 5.4 mm in the second direction B, and a dimension W of 65 mm in the third direction C. The first adhesive member 51 employs one first sub-adhesive 51A and one first sub-adhesive 51B, and distributes them symmetrically in the middle. The dimension W3 of the first sub-adhesive 51A and the first sub-adhesive 51B in the first direction A is 12 mm. The gap d1 between the first sub-adhesive 51A and the first sub-adhesive 51B is 3 mm. A first through hole 61 is provided in the portion where the first sub-adhesive 51A, the first sub-adhesive 51B, and the seventh surface S7 are bonded. The diameter d2 of the first through hole 61 is 1 mm. The distance d3 between adjacent first through holes 61 is 1.5 mm. The second adhesive member 53 has a dimension W2 in the third direction C of 13 mm, a dimension W4 in the first direction A of 8 mm, and a dimension W2 in the second direction B of 20 μm.

[0053] Example 3 The main body 21 has a dimension L of 85 mm in the first direction A, a dimension of 4.9 mm in the second direction B, and a dimension W of 63 mm in the third direction C. The first adhesive member 51 employs one first sub-adhesive 51A and one first sub-adhesive 51B, and distributes them symmetrically in the middle. The dimension W3 of the first sub-adhesive 51A and the first sub-adhesive 51B in the first direction A is 12.5 mm. The gap d1 between the first sub-adhesive 51A and the first sub-adhesive 51B is 3 mm. A first through hole 61 is provided in the portion where the first sub-adhesive 51A, the first sub-adhesive 51B, and the seventh surface S7 are bonded. The diameter d2 of the first through hole 61 is 1 mm. The distance d3 between adjacent first through holes 61 is 1.5 mm. The second adhesive member 53 has a dimension W2 in the third direction C of 63 mm, a dimension W4 in the first direction A of 8 mm, and a dimension in the second direction B of 20 μm.

[0054] <Comparative Example 3> The main body 21 has a dimension L of 85 mm in the first direction A, a dimension of 4.9 mm in the second direction B, and a dimension W of 63 mm in the third direction C. The first adhesive member 51 employs one first sub-adhesive 51A and one first sub-adhesive 51b, and distributes them symmetrically in the middle. The dimension W3 of the first sub-adhesive 51A and the first sub-adhesive 51B in the first direction A is 12.5 mm. The gap d1 between the first sub-adhesive 51A and the first sub-adhesive 51B is 3 mm. A first through hole 61 is provided in the portion where the first sub-adhesive 51A, the first sub-adhesive 51B, and the seventh surface S7 are bonded. The diameter d2 of the first through hole 61 is 1 mm. The distance d3 between adjacent first through holes 61 is 1.5 mm. The second adhesive member 53 has a dimension W2 in the third direction C of 13 mm, a dimension W4 in the first direction A of 8 mm, and a dimension in the second direction B of 20 μm.

[0055] A drop test was conducted on the batteries of Examples 1 to 3 and Comparative Examples 1 to 3 under the following test conditions. The test results are shown in Table 1.

[0056] Drop test method: 1) Place the battery in the dedicated jig. 2) It is allowed to fall freely from a height of 1.8 meters onto the surface of a steel plate, and then repeatedly dropped three times. 3) After each test, measure and record the battery voltage and inspect the battery appearance. If there is any leakage or fire, the test will stop. 4) After the drop is completed, the electrode assembly is disassembled and the percentage of voltage drop failure and the number and percentage of shrinkage points of the separator film are statistically recorded.

[0057] JPEG0007667258000001.jpg57170

[0058] From the results of Table 1, it was confirmed that by using two types of adhesive methods, in which the first adhesive member is attached to all of the first, third, seventh, fourth and second surfaces of the body, and the second adhesive member is attached to the first and fifth surfaces but not to the sixth surface, it is possible to fundamentally and effectively solve the problem of voltage drop caused by the contraction of the separator film during the drop process while balancing battery performance such as electrolyte wettability and energy density.

[0059] Finally, it should be noted that the above embodiments are only used to describe the technical proposal of the present application, and do not limit the scope of protection of the present application. Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to those described in these embodiments. As can be understood by those skilled in the art, the above technical proposals can be modified or equivalently substituted without departing from the technical spirit and scope of the present application. [Explanation of symbols]

[0060] 100 Mobile Phones 10 Hard shell battery / soft pack battery 1. Housing 2. Electrode Assembly 21 Main body 211 First electrode sheet 2111 First Collection Fluid 2113 1st active material layer 2115 First Tab 213 Second electrode sheet 2131 Fluids, Volume 2 2133 Second active material layer 2135 2nd tab 215 Separator Film 221 First protrusion 223 Part 1 225 Second convex part 3 Cover 31 1st metal part 33 Second metal part 4 Connection sheet 51 First adhesive member 51A First sub-adhesive member 51B First sub-adhesive member 53 Second adhesive member 55 Third adhesive member 57 Fourth adhesive member 61 First through hole 63 Second Through Hole 65 3rd Through Hole 70 Seals S1 1st surface S2 2nd surface S3 3rd surface S31 1st arc surface area S33 1st area S35 2nd arc area S4 4th surface S5 5th surface S51 3rd arc surface area S53 2nd area S55 4th arc surface area S6 6th surface S7 7th surface S8 8th surface A 1st direction B Second direction C 3rd direction L Dimension of the main body in the first direction W Dimension of the main body in the third direction W1: Dimension of the first adhesive member in the third direction W2: Dimension of the second adhesive member in the third direction W3: Dimension in the first direction between the first adhesive member and the first sub-adhesive member W4: Dimension of the second adhesive member in the first direction W5: Dimension of fourth adhesive member in the third direction W6: Dimension of fourth adhesive member in the first direction d1: Gap between first sub-adhesive members in the third direction d2 Diameter of the first through hole d3 Distance between adjacent first through holes d4 Diameter of the second through hole d5 Distance between adjacent second through holes d6 Diameter of the third through hole d7 Distance between adjacent third through holes A Part of the separator film that does not extend beyond the edge of the second electrode sheet B. A portion of the separator film extending beyond the edge of the second electrode sheet

Claims

1. A battery comprising a housing having a receiving chamber formed therein, an electrode assembly, a first adhesive member, and a second adhesive member, the electrode assembly includes a body portion, a first metal portion, and a second metal portion electrically opposite to the first metal portion, the body portion being accommodated in the accommodating chamber, the first metal portion and the second metal portion both being electrically connected to the body portion, protruding from the body portion along a first direction, and extending outward from the housing; the main body portion includes a first electrode sheet, a second electrode sheet, and a separator film provided between the first electrode sheet and the second electrode sheet, a thickness direction of the electrode assembly is defined as a second direction, the second direction is perpendicular to the first direction, the first electrode sheet and the second electrode sheet are provided to overlap each other in the second direction, or both sides of the second electrode sheet in the first direction exceed the first electrode sheet, the main body portion includes a first convex portion, a first portion, and a second convex portion that are connected in sequence along the first direction, and the first convex portion and the second convex portion are formed by portions of two edges of the separator film that are opposed to each other along the first direction, the portions extending beyond the edges of the second electrode sheet, the first portion includes a first surface and a second surface disposed opposite to each other in the second direction, the first convex portion includes a third surface on the same side as the first surface and a fourth surface disposed opposite the third surface, the second convex portion includes a fifth surface on the same side as the first surface and a sixth surface disposed opposite the fifth surface, the first convex portion further includes a seventh surface in the first direction, and the first metal portion is located at a middle position of the electrode assembly or at a position close to the fifth surface in the second direction; the first adhesive member adheres the first surface, the third surface, the seventh surface, the fourth surface, and the second surface; the second adhesive member bonds the first surface and the fifth surface but does not bond the sixth surface; A third direction is defined as being perpendicular to the first direction and the second direction, and in the third direction, the dimension of the main body is W and the dimension of the second adhesive member is W ２ and 0.7W≦W ２ ≦W.

2. The battery according to claim 1 , wherein the first adhesive member sequentially bonds the first surface, the third surface, the seventh surface, the fourth surface, and the second surface.

3. The battery according to claim 1 , wherein an edge of the second adhesive member does not extend beyond an edge of the separator film in the first direction.

4. In the third direction, the dimension of the first adhesive member is W １ and 0.7W≦W １ 2. The battery of claim 1, wherein W is less than or equal to W.

5. 0.8W≦W １ ≦0.9W and / or 0.8W≦W ２ 5. The battery of claim 4, wherein the current is ≦0.9 W.

6. 2. The battery of claim 1, wherein a third direction is defined as being perpendicular to the first direction and the second direction, and when viewed from the second direction, the third surface includes a first arcuate region, a first region, and a second arcuate region that are successively connected in the third direction, and the first adhesive member bonds the first region and at least one of the first arcuate region and the second arcuate region.

7. a third direction is defined as being perpendicular to the first direction and the second direction, and when viewed from the second direction, the fifth surface includes a third arc surface region, a second region, and a fourth arc surface region that are successively connected in the third direction; The battery according to claim 1 , wherein the second adhesive member adheres the second region and adheres at least one of the third arcuate region and the fourth arcuate region.

8. The battery according to claim 1 , wherein at least one first through hole is provided in a portion where the first adhesive member and the seventh surface are adhered to each other.

9. The diameter d of the first through hole ２ is 0.5 mm to 2 mm, and / or the distance d between adjacent first through holes is ３ The battery according to claim 8, wherein the thickness is 1 mm to 4 mm.

10. 9. The battery according to claim 8, wherein at least one second through hole is provided in a portion where the first adhesive member and the first surface are bonded, and an aperture ratio per unit area of ​​the portion where the first adhesive member and the first surface are bonded is smaller than an aperture ratio per unit area of ​​a portion where the first adhesive member and the seventh surface are bonded.

11. 9. The battery according to claim 8, characterized in that at least one third through hole is provided in a portion where the first adhesive member and the second surface are bonded, and an aperture ratio per unit area of ​​the portion where the first adhesive member and the second surface are bonded is smaller than an aperture ratio per unit area of ​​a portion where the first adhesive member and the seventh surface are bonded.

12. 2. The battery according to claim 1, wherein at least one of a portion where the first adhesive member and the first surface are bonded and a portion where the first adhesive member and the second surface are bonded does not have a through hole.

13. 2. The battery of claim 1, wherein a third direction is defined as being perpendicular to the first direction and the second direction, and the first adhesive member includes a plurality of first sub-adhesive members distributed at intervals in the third direction.

14. 2. The battery of claim 1, wherein the first electrode sheet includes a first fluid collection material, and the first surface includes at least a portion of a surface of the first fluid collection material.

15. 2. The battery according to claim 1, wherein the housing is a package having a multi-layer structure.

16. The battery described in claim 1, characterized in that the second convex portion has an eighth surface in the first direction, and the main body portion does not have an adhesive member that sequentially adheres the fifth surface, the eighth surface, and the sixth surface.

17. 17. An electronic device comprising a battery according to any one of claims 1 to 16.

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