Battery and power-using device

Abstract

The purpose of the embodiments of the present disclosure is to provide a battery and an electrical device. The battery includes a stack, a first conductive part, a second layer and a shell, wherein the stack includes a first conductive layer, a second conductive layer, and a first layer disposed between the first conductive layer and the second conductive layer and including an insulating material; the first conductive part is electrically connected to the first conductive layer, and the first conductive part extends along a first direction away from the stack; the shell covers the stack, and the shell covers the first conductive part and a partial structure of the second layer; when observed along a third direction perpendicular to the first direction and the second direction, the second layer includes a first area overlapping with the first conductive part, and a second area separated from the first conductive part, and in the first direction, the second area has a first recessed portion recessed toward the shell.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrochemical devices, and in particular to a battery and an electrical device. Background Art

[0002] Due to their high energy density, high number of cycles and long storage time, secondary batteries such as lithium-ion batteries are widely used in electrical equipment such as electric vehicles, electric vehicles, smart storage devices, and drones.

[0003] In the related art, in order to reduce the volume of the battery, the tab is bent toward the battery housing, but the tab is prone to rebound after being bent, thus affecting the reliability of the battery. Summary of the invention

[0004] The purpose of the embodiments of the present disclosure is to provide a battery and an electrical device, which can improve the reliability of the battery by reducing the bending stress at the root of the tab by improving the tab structure.

[0005] An embodiment of the first aspect of the present disclosure provides a battery, comprising a stack, a first conductive part, a second layer and a shell, wherein the stack comprises a first conductive layer, a second conductive layer, and a first layer arranged between the first conductive layer and the second conductive layer and comprising an insulating material; the first conductive part is electrically connected to the first conductive layer, and the first conductive part extends along a first direction away from the stack; the shell covers the stack, and the shell covers the first conductive part and a partial structure of the second layer; when observed along a third direction perpendicular to the first direction and the second direction, the second layer comprises a first area overlapping with the first conductive part, and a second area separated from the first conductive part, and in the first direction, the second area has a first recessed portion recessed toward the shell.

[0006] In the battery provided by the embodiment of the present disclosure, the battery has a first conductive part connected to the stack and a second layer that wraps part of the first conductive part, and the second layer includes a first area overlapping with the first conductive part, and a second area located on one side of the first area in the second direction. The second area has a first recess on the side away from the shell. Since the second area has the first recess, when the first conductive part is bent, the first recess can disperse the bending stress of the root of the first conductive part, thereby reducing the bending stress of the root of the first conductive part and reducing the degree and probability of the first conductive part rebounding. In addition, when the first conductive part is connected to the circuit board, the stability of the connection between the first conductive part and the circuit board can be improved, thereby improving the reliability of the battery.

[0007] The battery according to the embodiment of the present disclosure may also have the following additional technical features:

[0008] In some embodiments of the present disclosure, in the second direction, the second layer includes a first endpoint, a second endpoint and a third endpoint, the first endpoint is located in the first region, and the first endpoint is separated from the shell in the first direction; the second endpoint is located in the second region, the second endpoint is separated from the shell in the first direction and is farthest from the shell in the first direction; the third endpoint is located in the second region, the third endpoint is separated from the shell in the first direction and is closest to the shell in the first direction; the first endpoint is located at the boundary between the first region and the second region, and in the second direction, the third endpoint is located between the first endpoint and the second endpoint.

[0009] In the embodiment of the present disclosure, after the first end point, the third end point and the second end point are connected in sequence, a first concave portion is formed on the plane where they are located, and the first concave portion can disperse the bending stress at the root of the first conductive portion, thereby reducing the bending stress at the root of the first conductive portion and reducing the degree and probability of rebound of the first conductive portion. In addition, when the first conductive portion is connected to the circuit board, the stability of the connection between the first conductive portion and the circuit board can be improved, thereby improving the reliability of the battery.

[0010] In some embodiments of the present disclosure, in the first direction, a first distance from the housing to the first end point is shorter than a second distance from the housing to the second end point. The first end point is located on the first region, the first region is a part of the second layer, the second layer is used to melt the heat-sealed battery, and the second layer is generally a tab glue resin layer. This arrangement is conducive to reducing the area of ​​the first region, thereby reducing the probability of the first conductive portion being difficult to bend due to the large area of ​​the first region.

[0011] In some embodiments of the present disclosure, the first distance is D1, and the second distance is D2, wherein D2>D1>1 / 3D2. The first distance D1 is smaller than D2, that is, the maximum height of the second region along the first direction is greater than the height of the side where the second region is connected to the first region, which is beneficial to reduce the bending stress at the root of the first conductive part and reduce the degree and probability of rebound of the first conductive part. In addition, when the first conductive part is connected to the circuit board, the stability of the connection between the first conductive part and the circuit board can be improved, thereby improving the reliability of the battery. The first distance D1 is greater than 1 / 3D2, which can reduce the probability of poor melting of the second layer and the battery shell package due to the first distance being too small.

[0012] In some embodiments of the present disclosure, the first distance ranges from 0.1 mm to 2.5 mm, and the second distance ranges from 0.2 mm to 3.0 mm.

[0013] In some embodiments of the present disclosure, when viewed along a third direction, the first recess includes a first end edge connecting the first endpoint and the third endpoint in the second region, and a second end edge connecting the second endpoint and the third endpoint, and the third direction is perpendicular to the first direction and the second direction. The outer surface where the first end edge and the second end edge are located together form the first recess, which is beneficial to reduce the bending stress at the root of the first conductive part and reduce the degree and probability of the first conductive part rebounding. In addition, when the first conductive part is connected to the circuit board, the stability of the connection between the first conductive part and the circuit board can be improved, thereby improving the reliability of the battery.

[0014] The first end edge and the second end edge may be all straight lines, all curved lines, or irregular shapes, which is not limited in the embodiment of the present disclosure.

[0015] In some embodiments of the present disclosure, in the first direction, the first end edge includes a first convex portion protruding in a direction away from the housing. The first convex portion is provided to improve the sealing and heat dissipation performance between the first conductive portion, the second layer and the housing.

[0016] In some embodiments of the present disclosure, in the first direction, the first end edge includes a second recessed portion that is recessed toward the direction close to the housing. The second recessed portion is provided to facilitate the selection of the bending position of the first conductive portion, and a position between the second end point B and the third end point C can be selected for flexible bending, which helps reduce the risk of the second end edge being pulled when the third end point C is bent.

[0017] In some embodiments of the present disclosure, the first end edge is a straight line, which is helpful to maintain the strength of the first end edge of the second layer.

[0018] In some embodiments of the present disclosure, in the first direction, the second end edge includes a second convex portion protruding away from the housing. Providing the second convex portion is beneficial to increasing the area of ​​the second layer, thereby facilitating improved heat dissipation of the second layer.

[0019] In some embodiments of the present disclosure, in the first direction, the second end edge includes a third recessed portion recessed toward the shell body. The third recessed portion is provided to facilitate the bending of the second layer at the second end edge, thereby facilitating the improvement of energy density.

[0020] In some embodiments of the present disclosure, the second end edge is a straight line, which is helpful to maintain the strength of the second end edge of the second layer.

[0021] In some embodiments of the present disclosure, the second layer includes a fourth end point that is the farthest from the first conductive portion in the second direction and is in contact with the housing. The fourth end point, together with the first end point, the second end point, and the third end point, defines the outer shape of the second region.

[0022] In some embodiments of the present disclosure, in the second direction, the third distance from the first end point to the third end point is greater than the fourth distance from the second end point to the fourth end point in the second direction. Wherein, the third distance being greater than the fourth distance is beneficial for facilitating the processing of the first recess and also for the second region to encapsulate the battery, which is conducive to improving the encapsulation reliability.

[0023] In some embodiments of the present disclosure, the first distance is D1, the second distance is D2, the third distance is D3, and the fourth distance is D4, wherein D3 + D4 < D1 < D2. When D3 + D4 < D1, it can ensure that there is sufficient exposed size in the first direction to ensure the encapsulation yield and strength, and at the same time have a good root bending effect, which is conducive to improving the energy density; when D1 < D2, it is beneficial to reduce the risk of poor encapsulation caused by the shaking and misalignment of the first conductive portion during the encapsulation of the first conductive portion and the housing.

[0024] In some embodiments of the present disclosure, the range of the third distance is from 0.1 mm to 2 mm, and the range of the fourth distance is from 0.1 mm to 2 mm.

[0025] In some embodiments of the present disclosure, along the second direction, the second end point is located between the fourth end point and the third end point. At this time, the fourth end point is at a relatively large distance from the first region, which is beneficial for the second layer to have sufficient sealing range to thermally press seal the housing, and thus is conducive to improving the sealing reliability.

[0026] In some embodiments of the present disclosure, when observed along the third direction, the battery further includes a third side edge connecting the second end point and the fourth end point. The first side edge, the second side edge, and the third side edge together define the outer shape of the second region.

[0027] In some embodiments of the present disclosure, in the first direction, the third side edge has a third convex portion protruding away from the housing. By providing the third convex portion, it is beneficial to increase the area of the second layer, and thus is conducive to improving the heat dissipation of the second layer.

[0028] In some embodiments of the present disclosure, in the first direction, the third side edge has a fourth recess recessed towards the housing. By providing the fourth recess, it is beneficial for facilitating the bending of the second layer at the third side edge, and thus is conducive to improving the energy density.

[0029] In some embodiments of the present disclosure, the third end edge is a straight line, which is helpful to maintain the strength of the third end edge of the second layer.

[0030] In some embodiments of the present disclosure, the stacked body is an axially wound structure or a stacked structure.

[0031] An embodiment of a second aspect of the present disclosure provides an electric device, wherein the electric device comprises the battery described in the first aspect, and the battery is used to provide electric energy to the electric device.

[0032] The electrical device provided by the embodiment of the present disclosure uses the battery described in the first aspect as a power source. The battery has a first conductive part connected to the stack and a second layer that wraps part of the first conductive part, and the second layer includes a first area overlapping with the first conductive part, and a second area located on one side of the first area in the second direction. The second area has a first recess on the side away from the shell. Since the second area has the first recess, when the first conductive part is bent, the first recess can disperse the bending stress of the root of the first conductive part, thereby reducing the bending stress of the root of the first conductive part and reducing the degree and probability of the first conductive part rebounding. In addition, when the first conductive part is connected to the circuit board, the stability of the connection between the first conductive part and the circuit board can be improved, which is beneficial to improve the reliability of the battery and the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present disclosure and the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments and the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic structural diagram of a battery in a third direction according to an embodiment of the present disclosure;

[0035] Figure 2 It is a schematic structural diagram of a battery in a second direction according to an embodiment of the present disclosure;

[0036] Figure 3 is an exploded schematic diagram of a battery according to an embodiment of the present disclosure;

[0037] Figure 4 A schematic top view of a tab in a first direction according to an embodiment of the present disclosure;

[0038] Figure 5 for Figure 1 An enlarged schematic diagram of M;

[0039] Figure 6 is a schematic structural diagram of a second layer in an embodiment of the present disclosure;

[0040] Fig. 6A is a schematic diagram of the structure of the second layer of one embodiment of the present disclosure;

[0041] Figure 6B is a schematic diagram of the structure of another second layer in an embodiment of the present disclosure;

[0042] Figure 7 is a schematic diagram of the structure of another second layer in an embodiment of the present disclosure;

[0043] Fig. 7A is a schematic diagram of the structure of another second layer in an embodiment of the present disclosure;

[0044] Figure 7B is a schematic diagram of the structure of another second layer in an embodiment of the present disclosure;

[0045] Figure 8 is a schematic diagram of the structure of another second layer in an embodiment of the present disclosure;

[0046] Fig. 8A is a schematic diagram of the structure of another second layer in an embodiment of the present disclosure;

[0047] Figure 8B is a schematic diagram of the structure of another second layer in an embodiment of the present disclosure;

[0048] Fig. 9 is a schematic structural diagram of a laminate according to an embodiment of the present disclosure;

[0049] Fig.10 It is a schematic structural diagram of another laminated body according to an embodiment of the present disclosure.

[0050] Reference numerals:

[0051] Battery-10; Housing-20; Circuit board-110; Laminated body-200; First conductive layer-201; Second conductive layer-202; First layer-203; First conductive portion-300; Second layer-400; First region-500; Second region-600; First recess-610; First endpoint-A; Second endpoint-B; Third endpoint-C; Fourth endpoint-D; First end edge 611; Second end edge-612; Third end edge-613 13; first convex portion -614; second concave portion -615; second convex portion -616; third concave portion -617; third convex portion -618; fourth concave portion -619; first distance -D1; second distance -D2; third distance -D3; fourth distance -D4; fifth distance -D5; sixth distance -D6; seventh distance -D7; eighth distance -D8; first side -301; second side -302; third side -303; fourth side -304. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present disclosure are described clearly and in detail below. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0053] Hereinafter, the embodiments of the present disclosure will be described in detail. However, the present disclosure may 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 disclosure is thoroughly and in detail communicated to those skilled in the art.

[0054] 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.

[0055] Further, the use of “may” when describing embodiments of the present disclosure refers to “one or more embodiments of the present disclosure.”

[0056] The technical terms used herein are for the purpose of describing specific embodiments and are not intended to limit the present disclosure. 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.

[0057] 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 directions 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 teachings of the exemplary embodiments. In the present disclosure, the first direction may be any direction in the plane where the first surface is located.

[0058] Some embodiments of the present disclosure are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0059] Due to their high energy density, high number of cycles and long storage time, secondary batteries such as lithium-ion batteries are widely used in electrical devices such as electric vehicles, electric vehicles, smart storage devices, and drones.

[0060] In the related art, a lithium-ion battery may include two tabs, a shell, and an electrode assembly located in the shell. The two tabs are led out of the electrode assembly and extend out of the shell through tab glue. The tab glue is used to seal the tabs and the battery shell. In order to save the space occupied by the battery in the direction where the tabs extend, the tabs may be bent. However, when there is too much tab glue, the tabs may rebound after being bent, which may affect the reliability of the battery.

[0061] Based on the above problems, the embodiments of the present disclosure provide a battery 10 and an electrical device, which reduce the bending stress at the root of the tab by improving the tab structure, so as to improve the reliability of the battery 10.

[0062] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Fig. 9As shown, an embodiment of the first aspect of the present disclosure provides a battery 10, the battery 10 includes a stack 200, a first conductive part 300, a second layer 400 and a shell 20, wherein the stack 200 includes a first conductive layer 201, a second conductive layer 202, and a first layer 203 arranged between the first conductive layer 201 and the second conductive layer 202 and including an insulating material; the first conductive part 300 is electrically connected to the first conductive layer 201, and the first conductive part 300 extends along a first direction away from the stack 200; the shell 20 covers the stack 200, and the shell 20 covers a part of the structure of the first conductive part 300 and the second layer 400; when observed along a third direction perpendicular to the first direction and the second direction, the second layer 400 includes a first area 500 overlapping with the first conductive part 300, and a second area 600 separated from the first conductive part 300, and in the first direction, the second area 600 has a first recess 610 recessed toward the shell 20.

[0063] In the embodiment of the present disclosure, the first direction is the direction in which the second layer 400 extends out of the housing 20, the second direction is the extension direction from the first area 500 to the second area 600 of the second layer 400, and the third direction is perpendicular to the second direction and the first direction. Figure 1 As shown, the following embodiments are specifically described by taking the first direction as the X direction, the second direction as the Z direction, and the third direction as the Y direction as an example.

[0064] like Figure 1 As shown, a battery 10 according to an embodiment of the present disclosure is provided. The battery 10 includes a shell 20 and a laminate 200 located in the shell 20. The battery 10 may also include a first conductive portion 300, which is electrically connected to the laminate 200 in the shell 20 and extends from the laminate 200 to the outside of the shell 20. The first conductive portion 300 may be a tab, specifically, the first conductive portion 300 may be a positive tab or a negative tab. The material of the first conductive portion 300 may generally be aluminum, copper or an alloy material. Further, as Figure 1 and Figure 2 As shown, the battery 10 may further include a circuit board 110, which is connected to the first conductive portion 300 extending from the housing 20. The circuit board 110 is an integrated circuit board that protects the battery 10, specifically used to reduce the probability of problems such as overcharge, overdischarge or short circuit in the battery. Figure 1 As shown, in order to save the space occupied by the battery 10 in the direction in which the first conductive part 300 extends, the first conductive part 300 is bent when connected to the circuit board 110. Optionally, the connection method between the first conductive part 300 and the circuit board 110 includes but is not limited to bonding, welding, etc.

[0065] like Figure 1 and Figure 4As shown, Figure 4 4 is a top view of the first conductive part 300 in the first direction X. The second layer 400 covers a portion of the first conductive part 300. The second layer 400 may be a tab glue resin layer. The material of the tab glue resin layer may include polypropylene, modified polypropylene, or polyolefin resins such as polyethylene. Further, the tab glue resin layer may also have a multi-layer resin layer or a polyester layer structure. For example, the outermost tab glue resin layer may be a melt-heat-sealed resin layer, which is melted and compressed with the inner resin layer of the outer packaging laminate film of the shell 20, thereby achieving the sealing of the battery 10 shell and the first conductive part 300.

[0066] In the embodiment of the present disclosure, the second layer 400 is located on a portion of the outer surface of the first conductive part 300. Figure 4 As shown, when viewed from the first direction X, the second layer 400 and the internal first conductive part 300 have an overlapping first region 500, and the second layer 400 also includes a second region 600 that is separated from the first conductive part 300, extends along the second direction, and is separated from the first region 500. The second layer 400 can be used to melt and compress with the internal resin layer of the battery 10 housing 20, thereby achieving sealing between the battery 10 and the first conductive part 300.

[0067] The stack 200 may be an electrode assembly in the battery 10, and the electrode assembly is a component in the battery 10 that undergoes an electrochemical reaction to generate electrical energy. The stack 200 may be formed by axially winding or stacking a first conductive layer 201 and a second conductive layer 202. The first conductive layer 201 and the second conductive layer 202 may be positive or negative electrodes in the electrode assembly, and the polarity of the first conductive layer 201 is opposite to that of the second conductive layer 202. Further, the first conductive layer 201 and the second conductive layer 202 may include a portion having an active substance, and the portion having the active substance may together constitute the main body of the stack 200. Optionally, when the first conductive layer 201 or the second conductive layer 202 is a positive electrode, the active substance may generally be LiCoO2, etc., and when the first conductive layer 201 or the second conductive layer 202 is a negative electrode, the active substance may generally be carbon, etc. In addition, the first conductive part 300 is connected to the first conductive layer 201. Specifically, the first conductive part 300 may be a positive electrode tab or a negative electrode tab connected to the positive electrode sheet or the negative electrode sheet. Further, when the first conductive part 300 is a positive electrode tab, the material of the first conductive part 300 may include at least one of aluminum (Al) or an aluminum alloy, and when the first conductive part 300 is a negative electrode tab, the material of the first conductive part 300 may include at least one of nickel (Ni), copper (Cu), or nickel-plated copper (Ni-Cu).

[0068] In addition, the laminate 200 may further include a first layer 203 located between the first conductive layer 201 and the second conductive layer 202. The first layer 203 may be a diaphragm, which is a porous plastic film, and its commonly used materials include polypropylene (PP), polyethylene (PE), copolymers of propylene and ethylene, polyethylene homopolymers, etc. When the laminate 200 includes the first layer 203, the first conductive layer 201, the second conductive layer 202, and the first layer 203 may be wound or stacked to form the laminate 200.

[0069] The battery 10 provided in the embodiment of the present disclosure has a first conductive part 300 connected to the stack 200 and a second layer 400 that wraps part of the first conductive part 300, and the second layer 400 includes a first area 500 overlapping the first conductive part 300, and a second area 600 located on one side of the first area 500 in the second direction Z. The second area 600 has a first recess 610 on one side away from the housing 20. Since the second area 600 has the first recess 610, when the first conductive part 300 is bent, the first recess 610 can disperse the bending stress at the root of the first conductive part 300, thereby reducing the bending stress at the root of the first conductive part 300 and reducing the degree and probability of the first conductive part 300 rebounding. In addition, when the first conductive part 300 is connected to the circuit board 110, the stability of the connection between the first conductive part 300 and the circuit board 110 can be improved, thereby improving the reliability of the battery 10.

[0070] like Figure 1 and Figure 5 As shown, in some embodiments of the present disclosure, when observed along the third direction Y, the second layer 400 includes a first region 500 and a second region 600. Among them, the second region 600 includes a first end edge 611, a second end edge 612 and a third end edge 613. The surfaces where the first end edge 611 and the second end edge 612 are located jointly define a first recess 610. The first recess 610 can disperse the bending stress at the root of the first conductive part 300, thereby reducing the bending stress at the root of the first conductive part 300 and reducing the degree and probability of rebound of the first conductive part 300. In addition, when the first conductive part 300 is connected to the circuit board 110, the stability of the connection between the first conductive part 300 and the circuit board 110 can be improved, thereby improving the reliability of the battery 10.

[0071] like Figure 5 As shown, in some embodiments of the present disclosure, in the second direction Z, the second region 600 includes a first endpoint A, a second endpoint B, a third endpoint C, and a fourth endpoint D. The first endpoint A and the third endpoint C are located on the first end edge 611; the second endpoint B and the third endpoint C are located on the second end edge 612, and the second endpoint B and the fourth endpoint D are located on the third end edge 613.

[0072] Furthermore, if Figure 5 As shown, in the second direction, the first conductive portion 300 includes a first side 301 farthest from the second region 600 and a second side 302 close to the second region 600 ; in the first direction, the first conductive portion 300 includes a third side 303 farthest from the first region 500 and a fourth side 304 overlapping with the first region 500 .

[0073] Observed from the third direction Y, the first endpoint A is located in the first region 500, and the first endpoint A is separated from the housing 20 in the first direction X, and the first endpoint A is the intersection of the first end edge 611 and the second side 302 of the first conductive part 300; the second endpoint B is located in the second region 600, and the second endpoint B is separated from the housing 20 in the first direction X and is farthest from the housing 20 in the first direction X, and the second endpoint B is the intersection of the second end edge 612 and the third end edge 613; the third endpoint C is located in the second region 600, and the third endpoint C is separated from the housing 20 in the first direction X and is closest to the housing 20 in the first direction X, and the third endpoint C is the intersection of the first end edge 611 and the second end edge 612; the fourth endpoint D is located at the junction of the second region and the housing 20, and in the second direction Z, the fourth endpoint is farthest from the first conductive part 300. In the second direction Z, the third endpoint C is located between the first endpoint A and the second endpoint B. When viewed along the third direction Y, after the first endpoint A, the third endpoint C and the second endpoint B are sequentially connected, the planes on which they are located can jointly form the first concave portion 610 mentioned above.

[0074] In some embodiments of the present disclosure, in the first direction X, a first distance from the housing 20 to the first endpoint A is shorter than a second distance from the housing 20 to the second endpoint B. The first endpoint A is located on the first region 500. Generally, the first region 500 is a part of the second layer 400, and the second layer is used to heat-seal the battery 10. The second layer 400 is generally a layer of a tab glue resin, which is advantageous in reducing the area of ​​the first region 500, thereby reducing the probability of the occurrence of a situation such as an increased difficulty in bending the first conductive portion 300 due to an excessively large area of ​​the first region 500.

[0075] In some embodiments of the present disclosure, in the second direction Z, a third distance from the first endpoint A to the third endpoint C is greater than a fourth distance from the second endpoint B to the fourth endpoint D in the second direction Z.

[0076] The third distance is greater than the fourth distance, which is conducive to facilitating the processing of the first recess 610 and also facilitates the packaging of the battery in the second area 600, thereby improving the packaging reliability.

[0077] like Figure 5 As shown, in some embodiments of the present disclosure, the first distance is D1, and the second distance is D2, wherein D2>D1>1 / 3D2.

[0078] The first distance D1 refers to the distance from the first end point A to the housing 20 in the first direction X; the second distance D2 refers to the distance from the second end point B to the housing 20 in the first direction X. Figure 5 As shown, a fifth distance D5 is also included. The fifth distance D5 refers to the distance from the third end point C to the housing 20 in the first direction X. In the first direction X, the fifth distance D5 is smaller than the first distance D1 and the second distance D2, so that the first recess 610 is in a concave shape.

[0079] The first distance D1 is smaller than D2, but larger than 1 / 3D2, so that the height of the second region 600 along the first direction X is larger than the height of the side where the second region 600 is connected to the first region 500, which is beneficial to reduce the bending stress at the root of the first conductive part 300 and reduce the degree and probability of rebound of the first conductive part 300. In addition, when the first conductive part 300 is connected to the circuit board, the stability of the connection between the first conductive part 300 and the circuit board 110 can be improved, thereby improving the reliability of the battery 10. In addition, making the first distance D1 larger than 1 / 3D2 can reduce the probability of poor fusion of the second layer 400 and the battery 10 package due to the first distance D1 being too small.

[0080] Specifically, as shown in Table 1, there are experimental results of testing the packaging reliability of some specific embodiments and comparative examples set according to the embodiments of the present disclosure.

[0081] Table 1 The influence of the relationship between D1 and D2 on package reliability

[0082] Test items Example 1 Comparative Example 1 Comparative Example 2 condition D1>1 / 3D2 D1=1 / 3D2 D1<1 / 3D2 Test pass rate 20 / 20 18 / 20 13 / 20

[0083] In Table 1, the test conditions are: check the packaging tension at the tab of Example 1, Comparative Example 1 and Comparative Example 2. If the packaging tension is less than 2N / mm, the packaging is poor and the test result is not passed. By comparison, it can be seen that the first distance is greater than 1 / 3D2, which can reduce the probability of poor packaging fusion of the second layer 400 and the battery 10 due to the first distance D1 being too small.

[0084] In some embodiments of the present disclosure, the first distance D1 ranges from 0.1 mm to 2.5 mm, and the second distance D2 ranges from 0.2 mm to 3.0 mm.

[0085] In some embodiments of the present disclosure, the first distance is D1, the second distance is D2, the third distance is D3, and the fourth distance is D4, wherein D3+D4 <D1<D2。

[0086] like Figure 5As shown, the second region 600 further includes a third distance D3 and a fourth distance D4. The third distance D3 refers to the distance from the third end point C to the first end point A in the second direction Z; the fourth distance D4 refers to the distance from the fourth end point D to the second end point B in the second direction Z. The second region 600 further includes a sixth distance D6, and the sixth distance D6 refers to the distance from the third end point C to the second end point B in the second direction Z. In the second direction Z, the sixth distance D6 is greater than the third distance D3 and the fourth distance D4.

[0087] When D3 + D4 < D1, it can ensure that there is sufficient exposed dimension in the first direction X to ensure the encapsulation yield and encapsulation strength, and at the same time have a good root bending effect, which is conducive to improving the energy density; when D1 < D2, it is beneficial to reduce the risk of poor encapsulation caused by the shaking and misalignment of the first conductive part 300 in the X and Z planes during the encapsulation process of the first conductive part 300 and the housing 20.

[0088] In some embodiments of the present disclosure, the range of the third distance D3 is 0.1 mm to 2 mm, and the range of the fourth distance D4 is 0.1 mm to 2 mm.

[0089] As Figure 5 shown, in some embodiments of the present disclosure, along the second direction Z, the second end point B is located between the fourth end point D and the third end point C. At this time, when observed from the third direction Y, in the second layer 400, the distance from the fourth end point D to the first region 500 in the second direction Z is the largest, which is beneficial to enabling the second layer 400, that is, the tab glue resin layer, to have a sufficient sealing range to thermally press seal the housing 20, thereby facilitating the improvement of the sealing reliability.

[0090] The planes where the first end edge 611, the second end edge 612, and the third end edge 613 are located jointly define the outer shape of the second region 600. Among them, the first end edge 611, the second end edge 612, and the third end edge 613 can be in a straight line shape, a curved shape, or an irregular shape, and the embodiments of the present disclosure do not make limitations.

[0091] Specifically, as Figure 6 shown, in some embodiments of the present disclosure, in the first direction X, the first end edge 611 includes a first convex portion 614 protruding in a direction away from the housing 20 and a second concave portion 615 recessed in a direction close to the housing 20. In the first direction X, there is a seventh distance D7 between the topmost part of the first convex portion 614 and the housing 20, and D7 > D1. In this way, it is beneficial to increase the contact area between the second layer 400 and the housing 20. There is an eighth distance D8 between the bottommost part of the second concave portion 615 and the housing 20, and D8 < D1. In this way, it is beneficial to further reduce the stress concentration at the root when the first conductive part 300 is bent, and reduce the degree and probability of the first conductive part 300 rebounding.

[0092] The first convex portion 614 is provided to improve the sealing and heat dissipation performance between the first conductive portion 300, the second layer 400 and the housing 20. The second concave portion 615 is provided to facilitate the selection of the bending position of the first conductive portion 300, and a position between the second end point B and the third end point C can be selected for flexible bending, and the risk of pulling the second end edge 612 when the third end point C is bent is reduced.

[0093] Or, if Fig. 6A As shown, a first convex portion 614 and a second concave portion 615 are respectively provided at two ends of the first end edge 611 , and a second first convex portion 614 is further provided in the middle of the first end edge 611 .

[0094] Or, if Figure 6B As shown, a first convex portion 614 and a second concave portion 615 are respectively provided at two ends of the first end edge 611 , and a second second concave portion 615 is further provided in the middle of the first end edge 611 .

[0095] Alternatively, there is only one first convex portion 614 or one second concave portion 615 on the first end edge 611 .

[0096] It is easy to imagine that the number of the first protrusions 614 and the second recesses 615 on the first end edge 611 can be freely combined, and the present disclosure does not limit this.

[0097] Or, if Figure 5 As shown, the first end edge 611 is a straight line, which is helpful to maintain the strength of the first end edge 611 of the second layer 400. Correspondingly, the second end edge 612 can also have a variety of shapes.

[0098] like Figure 7 As shown, in some embodiments of the present disclosure, in the first direction X, the second end edge 612 includes a second protrusion 616 protruding in a direction away from the shell 20 and a third recess 617 recessed in a direction close to the shell 20 .

[0099] The second convex portion 616 is provided to increase the area of ​​the second layer 400, thereby improving the heat dissipation of the second layer 400. The third concave portion 617 is provided to facilitate the bending of the second layer 400 at the second end edge 612, thereby improving the energy density.

[0100] Or, if Fig. 7A As shown, a second convex portion 616 and a third concave portion 617 are respectively provided at two ends of the second end edge 612 ; and a second second convex portion 616 is further provided in the middle portion of the second end edge 612 .

[0101] Or, if Figure 7BAs shown, a second convex portion 616 and a third concave portion 617 are respectively provided at both ends of the second end edge 612 ; a second third concave portion 617 is also provided in the middle portion of the second end edge 612 .

[0102] Alternatively, there is only one second convex portion 616 or one third concave portion 617 on the second end edge 612 .

[0103] It is easy to imagine that the number of the first convex portion 614 and the second concave portion 615 on the second end edge 612 can also be freely combined, and the present disclosure does not limit it. Alternatively, in some other embodiments of the present disclosure, the second end edge 612 is as follows: Figure 5 This helps maintain the strength of the second end edge 612 of the second layer 400.

[0104] Correspondingly, the third end edge 613 also has a variety of shapes.

[0105] For example Figure 8 As shown, in some embodiments of the present disclosure, in the first direction X, the third end edge 613 has a third protrusion 618 protruding in a direction away from the shell 20 and a fourth recess 619 recessed in a direction close to the shell 20 .

[0106] By providing the third convex portion 618, the area of ​​the second layer 400 is increased, thereby facilitating the heat dissipation of the second layer 400; by providing the fourth concave portion 619, the bending of the second layer 400 at the third end edge 613 is facilitated, thereby facilitating the improvement of the energy density.

[0107] Or, if Fig. 8A As shown, a third convex portion 618 and a fourth concave portion 619 are respectively provided at two ends of the third end edge 613 ; a second third convex portion 618 is also provided in the middle of the third end edge 613 .

[0108] Or, if Figure 8B As shown, a third convex portion 618 and a fourth concave portion 619 are respectively provided at two ends of the third end edge 613 ; a second fourth concave portion 619 is also provided in the middle of the third end edge 613 .

[0109] Alternatively, there is only one third protrusion 618 or one fourth recess 619 on the third end edge 613 .

[0110] It is easy to imagine that the number of the third protrusions 618 and the fourth recesses 619 on the third end edge 613 can be freely combined, and the present disclosure does not limit this.

[0111] Alternatively, the third end edge 613 is as follows Figure 5 This helps maintain the strength of the third end edge 613 of the second layer 400.

[0112] In some embodiments of the present disclosure, the stack 200 is an axially wound structure or a stacked structure. Fig. 9 and Fig.10 , which are schematic structural diagrams of a wound-type laminate 200 and a laminated-type laminate 200 , respectively.

[0113] The second aspect of the present disclosure provides an electric device, which includes the battery 10 of the first aspect, and the battery 10 is used to provide electric energy to the electric device. The electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.

[0114] The electric device provided by the embodiment of the present disclosure uses the battery 10 described in the first aspect as a power source. The battery 10 has a first conductive part 300 connected to the laminate 200 and a second layer 400 that wraps part of the first conductive part 300, and the second layer 400 includes a first region 500 overlapping with the first conductive part 300, and a second region 600 located on one side of the first region 500 in the second direction Z. The second region 600 has a first recess 610 on one side away from the housing 20. Since the first recess 610 is provided on the second region 600, when the first conductive part 300 is bent, the first recess 610 can disperse the bending stress at the root of the first conductive part 300, thereby reducing the bending stress at the root of the first conductive part 300 and reducing the degree and probability of the first conductive part 300 rebounding. In addition, when the first conductive part 300 is connected to the circuit board 110, the stability of the connection between the first conductive part 300 and the circuit board 110 can be improved, thereby improving the reliability of the battery 10 and the electric device.

[0115] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A battery, wherein: include: A laminate, the laminate comprising a first conductive layer, a second conductive layer, and a first layer disposed between the first conductive layer and the second conductive layer and comprising an insulating material; a first conductive portion, the first conductive portion being electrically connected to the first conductive layer and extending in a first direction away from the stack; A second layer, comprising an ear glue resin layer, the second layer is connected to the first conductive part, the second layer covers the first conductive part, and extends in a second direction perpendicular to the first direction to a position away from the first conductive part; A shell, comprising a laminate film, the laminate film comprising an internal resin layer, the tab glue resin layer being bonded to the internal resin layer, the shell covering the laminate, and the shell covering the first conductive portion and a partial structure of the second layer, and along the first direction, the first conductive portion and the second layer both extend out of the shell; When observed along a third direction perpendicular to the first direction and the second direction, the second layer includes a first area overlapping with the first conductive portion, and a second area separated from the first conductive portion along the second direction, and in the first direction, the second area has a first recessed portion recessed toward the shell, and the third direction is the thickness direction of the battery.

2. The battery according to claim 1, wherein In the second direction, the second layer comprises: a first endpoint, the first endpoint is located in the first region, and the first endpoint is separated from the housing in the first direction; a second endpoint, the second endpoint is located in the second area, the second endpoint is separated from the housing in the first direction and is farthest from the housing in the first direction; and a third endpoint, the third endpoint being located in the second region, the third endpoint being separated from the shell in the first direction and being closest to the shell in the first direction; The first endpoint is located at a boundary between the first region and the second region, and in the second direction, the third endpoint is located between the first endpoint and the second endpoint.

3. The battery according to claim 2, wherein: In the first direction, a first distance from the housing to the first end point is shorter than a second distance from the housing to the second end point.

4. The battery according to claim 3, wherein The first distance is D1, and the second distance is D2, wherein D2>D1>1 / 3D2.

5. The battery according to claim 3, wherein The first distance ranges from 0.1 mm to 2.5 mm, and the second distance ranges from 0.2 mm to 3.0 mm.

6. The battery according to claim 3, wherein: When viewed along a third direction, the first recess includes a first end edge connecting the first endpoint and the third endpoint in the second region, and a second end edge connecting the second endpoint and the third endpoint, and the third direction is perpendicular to the first direction and the second direction.

7. The battery according to claim 6, wherein: In the first direction, the first end side includes a first protrusion protruding in a direction away from the housing.

8. The battery according to claim 6, wherein: In the first direction, the first end edge includes a second recessed portion recessed in a direction approaching the housing.

9. The battery according to claim 6, wherein The first end side is a straight line.

10. The battery according to claim 6, wherein: In the first direction, the second end side includes a second protrusion protruding in a direction away from the housing.

11. The battery according to claim 6, wherein: In the first direction, the second end edge includes a third recessed portion recessed toward a direction approaching the housing.

12. The battery according to claim 6, wherein The second end side is a straight line.

13. The battery according to claim 6, wherein: The second layer includes a fourth end point which is farthest from the first conductive portion in the second direction and connected to the housing.

14. The battery according to claim 13, wherein: In the second direction, a third distance from the first endpoint to the third endpoint is greater than a fourth distance from the second endpoint to the fourth endpoint in the second direction.

15. The battery according to claim 14, wherein The first distance is D1, the second distance is D2, the third distance is D3, and the fourth distance is D4, wherein D3+D4 <D1<D2。 16. The battery according to claim 14, wherein The third distance ranges from 0.1 mm to 2 mm, and the fourth distance ranges from 0.1 mm to 2 mm.

17. The battery according to claim 14, wherein: Along the second direction, the second endpoint is located between the fourth endpoint and the third endpoint.

18. The battery according to claim 13, wherein: When viewed along the third direction, the battery further includes a third end edge connecting the second end point and the fourth end point.

19. The battery according to claim 18, wherein: In the first direction, the third end side has a third protrusion protruding in a direction away from the housing.

20. The battery of claim 18, wherein: In the first direction, the third end edge has a fourth recessed portion recessed toward a direction approaching the housing.

21. The battery according to claim 18, wherein The third end edge is a straight line.

22. The battery according to any one of claims 1 to 21, wherein The stacked body is an axially wound structure or a stacked structure.

23. The battery according to any one of claims 1 to 21, wherein The material of the ear glue resin layer includes polyolefin resin.

24. An electrical device, wherein: The electrical device comprises the battery according to any one of claims 1 to 21, and the battery is used to provide electrical energy to the electrical device.

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