Battery and electronic device comprising the same

Abstract

A battery includes an electrode assembly, a first conductive plate, and a case. The electrode assembly includes a first conductive layer, a second conductive layer, and a first layer disposed between the first conductive layer and the second conductive layer, the first layer containing an insulating material. The first conductive plate is connected to the first conductive layer and extends from the first conductive layer in a first direction. The case covers the electrode assembly and covers at least a portion of the first conductive plate. The case includes a first side surface opposite the electrode assembly in the first direction. The first conductive layer includes a plurality of edges opposite the first side surface in the first direction, the plurality of edges including a first edge group of two or more first edges disposed continuously in a second direction and a second edge group of two or more second edges disposed continuously in the second direction, the second direction being perpendicular to the first direction. In the first direction, each of the first edges in the first edge group is farther from the first side surface than each of the second edges in the second edge group.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage devices, and in particular to a battery and an electronic device comprising the same. BACKGROUND

[0002] Lithium ion batteries have many advantages such as high energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and are widely used in the consumer electronics field. With the rapid development of electric vehicles and mobile electronic devices in recent years, people have increasingly high demands for the energy density, service life, and cycle performance of batteries. Therefore, the structure of the battery needs to be continuously optimized. SUMMARY

[0003] One object of the present application is to provide a battery with improved service life.

[0004] The first aspect of the present application provides a battery, comprising an electrode assembly, a first conductive plate, and a housing. The electrode assembly comprises a first conductive layer, a second conductive layer, and a first layer disposed between the first conductive layer and the second conductive layer, the first layer comprising an insulating material. The first conductive plate is connected to the first conductive layer and extends from the first conductive layer in a first direction. The housing covers the electrode assembly and covers at least part of the first conductive plate. The housing comprises a first side surface opposite the electrode assembly in the first direction. The first conductive layer comprises a plurality of edges opposite the first side surface in the first direction, the plurality of edges comprising a first edge group comprising two or more first edges arranged continuously in a second direction, and a second edge group comprising two or more second edges arranged continuously in the second direction, the second direction being perpendicular to the first direction. In the first direction, the distance between each first edge in the first edge group and the first side surface is greater than the distance between each second edge in the second edge group and the first side surface.

[0005] The electrode assembly of the battery provided by the present application is provided with a first edge group and a second edge group on the side connected to the conductive plate, forming a stepped edge structure; and a stable cavity structure is formed between the electrode assembly and the housing through the first edge group, the second edge group, and the side surface of the housing, which can be used to store electrolyte and gas, thereby prolonging the service life of the battery; and due to the presence of the cavity structure, the electrode assembly and the housing have sufficient distance, which can reduce the risk of electrode assembly corner extrusion and housing damage during the falling process, thereby improving the service life.

[0006] According to some embodiments of the present application, the electrode assembly has a curved portion extending in the first direction and protruding in the second direction.

[0007] According to some embodiments of the present application, the electrode assembly has a portion protruding in the direction from the second edge group to the first edge group in the second direction.

[0008] According to some embodiments of the present application, the first edge group and the first side are configured in such a way that, when viewed in the second direction, a first straight line connecting two adjacent first edges in the first edge group intersects a second straight line coinciding with the first side.

[0009] According to some embodiments of the present application, the electrode assembly is formed by laminating or winding the first conductive layer, the first layer and the second conductive layer, and the winding axis direction of the electrode assembly is the first direction.

[0010] According to some embodiments of the present application, the first conductive layer comprises, when viewed in the second direction, a first region farther from the first side in the first direction than the first edge, and a first protrusion closer to the first side than the first edge.

[0011] According to some embodiments of the present application, the first protrusion generates a bend between the first region and the first side.

[0012] According to some embodiments of the present application, the first edge group and the housing form a first cavity, and the first protrusion generates a bend in the first cavity.

[0013] According to some embodiments of the present application, the first conductive layer is a positive electrode.

[0014] According to some embodiments of the present application, the first conductive layer comprises a first conductor layer, and the first conductor layer comprises aluminum.

[0015] According to some embodiments of the present application, the second conductive layer is a negative electrode.

[0016] According to some embodiments of the present application, the second conductive layer comprises a second conductor layer, and the second conductor layer comprises copper.

[0017] According to some embodiments of the present application, the second edge group and the housing form a second cavity.

[0018] According to some embodiments of the present application, the length of the electrode assembly in the first direction is L, the length of the first layer in the first direction is L1, and the length of the second layer in the first direction is L2, wherein L1 < L2 < L.

[0019] The second aspect of the present application further provides an electronic device comprising the above battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0021] Figure 1 A schematic diagram of a battery according to an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of the battery shown in FIG. 1 along II-II; Figure 1

[0023] Figure 3 A cross-sectional view of the battery shown in FIG. 1 along III-III; Figure 1

[0024] Figure 4 A cross-sectional view of the battery shown in FIG. 1 along IV-IV; Figure 1

[0025] A cross-sectional view of the battery provided in another embodiment of the present application, the cross-sectional position of which is the same as that of II-II in FIG. 1; Figure 5 Figure 2

[0026] Figure 6A A cross-sectional view of the battery provided in another embodiment of the present application, the cross-sectional position of which is the same as that of II-II in FIG. 1; Figure 2

[0027] Figure 6B A cross-sectional view of the battery provided in another embodiment of the present application, the cross-sectional position of which is the same as that of II-II in FIG. 1; Figure 2

[0028] Figure 7 A cross-sectional view of the battery provided in another embodiment of the present application, the cross-sectional position of which is the same as that of II-II in FIG. 1; Figure 2

[0029] Figure 8 A cross-sectional view of the battery provided in another embodiment of the present application, the cross-sectional position of which is the same as that of II-II in FIG. 1;

[0030] Figure 9 A cross-sectional view of the battery shown in FIG. 1 along IX-IX; Figure 8

[0031] A cross-sectional view of the battery provided in another embodiment of the present application, the cross-sectional position of which is the same as that of II-II in FIG. 1; Figure 10 Figure 2

[0032] Figure 11 A cross-sectional view of the battery provided in another embodiment of the present application, the cross-sectional position of which is the same as that of II-II in FIG. 1;

[0033] Main element symbol explanation

[0034] Battery 100

[0035] Electrode assembly 10

[0036] ​​​​​​​​​First conductive plate 20

[0037] Second conductive plate 30

[0038] Housing 40

[0039] First side 41

[0040] Second side 42

[0041] Third side 43

[0042] Fourth side 44

[0043] First conductive layer 11

[0044] First layer first conductive layer 113

[0045] Second layer first conductive layer 116

[0046] Third layer first conductive layer 117

[0047] Fourth layer first conductive layer 118

[0048] Fifth layer first conductive layer 119

[0049] Second conductive layer 12

[0050] First layer 13

[0051] First conductor layer 111

[0052] First conductive material layer 112

[0053] Second conductor layer 121

[0054] Second conductive material layer 122

[0055] First edge 11a

[0056] First strip first edge 11a1

[0057] Second strip first edge 11a2

[0058] Second edge 11b

[0059] First strip second edge 11b1

[0060] Second strip second edge 11b2

[0061] Third strip third edge 11b3

[0062] Fourth edge 11c, 11c1, 11c2, 11c3

[0063] First region 114

[0064] first region 114a

[0065] second region 114b

[0066] third region 114c

[0067] fourth region 114d

[0068] fifth region 114e

[0069] first protrusion 115

[0070] first protrusion 115a

[0071] second protrusion 115b

[0072] third protrusion 115c

[0073] fourth protrusion 115d

[0074] fifth protrusion 115e

[0075] sixth side 12a

[0076] seventh side 12b, 12b1, 12b2, 12b3

[0077] fifth side 12c, 12c1, 12c2, 12c3

[0078] second region 124

[0079] second protrusion 125

[0080] eighth side 13c, 13c1, 13c2, 13c3

[0081] ninth side 13a, 13a1, 13a2

[0082] tenth side 13b, 13b1, 13b2, 13b3

[0083] first side group 11A

[0084] second side group 11B

[0085] first cavity 401

[0086] second cavity 402

[0087] eleventh side 11d, 11d1, 11d2, 11d3

[0088] twelfth side 11e, 11e, 11e1, 11e2

[0089] Thirteenth edge 12d, 12d1, 11d2, 11d3

[0090] Fourteenth edge 12e, 12e1, 12e2, 12e3

[0091] Fifteenth edge 13d, 13d1, 13d2, 13d3

[0092] Sixteenth edge 13e, 13e1, 13e2, 13e3

[0093] Bend 101

[0094] Third edge 11f

[0095] Seventeenth edge 12f

[0096] Eighteenth edge 13f

[0097] Third edge group 11C, 11C'

[0098] Electronic device 200

[0099] Main body 220

[0100] Main body portion 410

[0101] Sealing portion 420

[0102] First surface 45

[0103] Second surface 46

[0104] Fourth edge group 11D

[0105] Fifth edge group 11E

[0106] Sixth edge group 11F

[0107] First sealing portion 420a

[0108] Second sealing portion 420b

[0109] Third sealing portion 420c

[0110] Housing cavity 411

[0111] Curved surface 47

[0112] First portion 41a

[0113] Second portion 41b DETAILED DESCRIPTION

[0114] The technical solutions in the embodiments of the present application will be described clearly and detailed below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Unless otherwise defined, all the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0115] Hereinafter, the embodiments of the present application will be described in detail. However, the present application can be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0116] In addition, for the sake of brevity and clarity, in the drawings, the size or thickness of various components, layers, or regions can be exaggerated. Throughout the specification, like numbers refer to like elements throughout. As used herein, the terms "and / or" and "at least one of" include any and all combinations of one or more of the associated listed items. In addition, it should be understood that if an element A is said to be "connected to" element B, then element A can be directly connected to element B or an intervening element C can be present and element A and element B can be indirectly connected to each other through element C.

[0117] Further, the use of "may" when describing embodiments of the present application indicates that one or more embodiments of the present application.

[0118] The professional terms used herein are for the purpose of describing the specific embodiments and are not intended to limit the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It should be further understood that the term "comprising" when used in this specification, means that the stated features, numbers, steps, operations, elements, and / or components are present, but does not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and / or combinations thereof.

[0119] Spatially relative terms, such as "on", "above", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device or apparatus in use or operation in addition to the orientations depicted in the figures. For example, if a device or apparatus is turned over, then an element or feature that is described as being "above" or "on" another element or feature would then be oriented "below" or "on" the other element or feature. Thus, the exemplary term "above" can encompass both an orientation above and below. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the exemplary embodiments.

[0120] Referring to FIGS. 1 and Figure 2 One embodiment of the present application provides a battery 100 including an electrode assembly 10, a first conductive plate 20, a second conductive plate 30, and a case 40. The first conductive plate 20 and the second conductive plate 30 are each connected to the electrode assembly 10. The case 40 covers the electrode assembly 10 and covers at least a portion of each of the first conductive plate 20 and the second conductive plate 30. In this embodiment, the first conductive plate 20 and the second conductive plate 30 are located on the same side of the battery 100 and extend outside the case 40. The first conductive plate 20 can be a positive electrode and can include at least one of Ni, Ti, Al, Ag, Au, Pt, Fe, and combinations thereof. The second conductive plate 30 can be a negative electrode and can include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, and combinations thereof.

[0121] The shell 40 can include a main body portion 410 and a sealing portion 420. The main body portion 410 is provided with a receiving cavity 411 for receiving the electrolyte, the electrode assembly 10, and at least a portion of the first conductive plate 20 and the second conductive plate 30. The main body portion 410 includes a first surface 45, a second surface 46, a first side surface 41, a second side surface 42, a third side surface 43, and a fourth side surface 44. The first side surface 41, the second side surface 42, the third side surface 43, and the fourth side surface 44 are sequentially connected and surround the receiving cavity 411. The first surface 45 and the second surface 46 seal two openings of the receiving cavity 411, respectively, to seal the receiving cavity. The first surface 45 can be connected to the first side surface 41, the second side surface 42, the third side surface 43, and the fourth side surface 44 by a curved surface 47 to seal one opening of the receiving cavity 411. In the present application, the arrangement direction of the first surface 45 and the second surface 46 is defined as a second direction Z, the arrangement direction of the first conductive plate 20 and the second conductive plate 30 is defined as a third direction Y, and a first direction X is perpendicular to the second direction Z and the third direction Y. In the second direction Z, the first surface 45 and the second surface 46 are oppositely arranged, the first surface 45 can extend in the first direction X and the third direction Y, and the second surface 46 can extend in the first direction X and the third direction Y. In the first direction X, the first side surface 41 and the third side surface 43 are oppositely arranged, the first side surface 41 can extend in the second direction Z and the third direction Y, and the third side surface 43 can extend in the second direction Z and the third direction Y. In the second direction Y, the second side surface 42 and the fourth side surface 44 are oppositely arranged, the second side surface 42 can extend in the second direction Z and the first direction X, and the fourth side surface 44 can extend in the second direction Z and the first direction X. The sealing portion 420 extends from the surface of the main body portion 410 to the side away from the main body portion 410. The sealing portion 420 is a part of the shell 40 that is sealed by a process such as heat pressing or adhesion after the electrode assembly 10 and the electrolyte are received in the shell 40. In the present embodiment, the sealing portion 420 includes a first sealing portion 420a, a second sealing portion 420b, and a third sealing portion 420c that are sequentially connected, the first sealing portion 420a extends from the first side surface 41 to the side away from the main body portion 410, the second sealing portion 420b extends from the second side surface 42 to the side away from the main body portion 410, and the third sealing portion 420c extends from the fourth side surface 44 to the side away from the main body portion 410. The first conductive plate 20 and the second conductive plate 30 extend out of the shell 40 from the first sealing portion 420a located on the first side surface 41. In the second direction Z, the first side surface 41 further includes a first portion 41a located on the side of the first conductive plate 20 close to the first surface 45 and a second portion 41b located on the side of the first conductive plate 20 close to the second surface 46.

[0122] In some embodiments, at least a portion of the surface and side of the main body 410 can have a conductive material to improve the mechanical strength of the shell 40. The shell 40 can be a metal shell, for example, a steel shell or an aluminum shell, etc. In other embodiments, the shell 40 can also be a packaging bag obtained by encapsulating with an encapsulation film, i.e., the battery 100 is a soft package battery.

[0123] The electrode assembly 10 includes a first conductive layer 11, a second conductive layer 12, and a first layer 13 disposed between the first conductive layer 11 and the second conductive layer 12. The electrode assembly 10 is formed by stacking or winding the first conductive layer 11, the first layer 13, and the second conductive layer 12. When the electrode assembly 10 is formed by winding the first conductive layer 11, the first layer 13, and the second conductive layer 12, the winding axis direction of the electrode assembly 10 is the first direction X. Figure 2 In some embodiments, the electrode assembly 10 is formed by alternately stacking the plurality of first conductive layers 11, the plurality of first layers 13, and the plurality of second conductive layers 12 in the second direction Z. In some embodiments, one of the first conductive layer 11 and the second conductive layer 12 is a positive electrode, and the other is a negative electrode. In some embodiments, the first conductive layer 11 is a positive electrode, and the second conductive layer 12 is a negative electrode. In the first direction X, the edge of the second conductive layer 12 protrudes outside the edge of the first conductive layer 11. In other embodiments, the first conductive layer 11 is a negative electrode, and the second conductive layer 12 is a positive electrode. In the first direction X, the edge of the first conductive layer 11 protrudes outside the edge of the second conductive layer 12. It should be noted that in the cross-sectional view, the cross section of the first conductive layer 11 is represented by a left oblique line, the cross section of the second conductive layer 12 is represented by a right oblique line, and the cross section of the first layer 13 is represented by a dashed line segment.

[0124] The first conductive layer 11 includes a first conductor layer 111 and a first conductive material layer 112 disposed on the first conductor layer 111. The first conductor layer 111 includes a region provided with the first conductive material layer 112 and a region away from the first conductive material layer 112. The first conductor layer 111 can have the function of a current collector and can include at least one of Ni, Ti, Ag, Au, Pt, Fe, Al, and combinations thereof. In this embodiment, the first conductor layer contains aluminum. The first conductive material layer 112 can have the function of an active layer and can include at least one of lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadium oxyphosphate, lithium-rich manganese-based material, lithium nickel cobalt aluminum phosphate, and combinations thereof.

[0125] The second conductive layer 12 includes a second conductor layer 121 and a second conductive material layer 122 disposed on the second conductor layer 121. The second conductor layer 121 includes a region provided with the second conductive material layer 122 and a region away from the second conductive material layer 122. The second conductor layer 121 can have the function of a current collector, which can include at least one of Ni, Ti, Cu, Ag, Au, Pt, Fe, and combinations thereof. In this embodiment, the second conductive layer 12 includes copper. The second conductive material layer 122 has the function of an active layer, which can be selected from at least one of graphite-based materials, alloy-based materials, lithium metal, and alloys thereof. The graphite-based materials can be selected from at least one of artificial graphite and natural graphite; the alloy-based materials can be selected from at least one of silicon, silicon oxide, tin, and titanium sulfide.

[0126] The first layer 13 is used to prevent the first conductive layer 11 and the second conductive layer 12 from directly contacting each other, thereby reducing the risk of contact short circuit between the first conductive layer 11 and the second conductive layer 12. The first layer 13 includes an insulating material. The insulating material is selected from at least one of polypropylene, polyethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polymethyl methacrylate, or polyethylene glycol. The first layer 13 can be a separator film.

[0127] The first conductive layer 11 further includes a plurality of edges opposite the first side 41 in the first direction X and a plurality of fourth edges 11c opposite the third side 43. Figure 2 Three of the fourth edges 11c 1, 11c2, 11c 3 are shown to be continuously arranged in the second direction Z, and the remaining fourth edges 11c are not labeled. The plurality of edges of the first conductive layer 11 opposite the first side 41 in the first direction X includes two or more first edges 11a continuously arranged in the second direction Z and two or more second edges 11b continuously arranged in the second direction Z. Figure 2The diagram shows a first first side 11a 1 and a second first side 11a 2 continuously arranged in the second direction Z, as well as a first second side 11b 1, a second second side 11b 2, and a third third side 11b 3 continuously arranged. The remaining second sides 11b are not indicated. In the second direction Z, two or more consecutively arranged first sides 11a are aligned with each other, two or more consecutively arranged second sides 11b are aligned with each other, and multiple fourth sides 11c are aligned with each other. In this application, multiple sides (e.g., multiple first sides 11a, multiple second sides 11b, multiple fourth sides 11c, etc.) being aligned with each other in the second direction Z means that the distance between the relative protrusions of the multiple sides in the first direction X or the third direction Y is within 0mm to 1mm. Specifically, the distance between the relatively protruding first edge 11a1 and the second first edge 11a2 in the first direction X is within 0 mm to 1 mm; the distance between the relatively protruding first second edge 11b1, the second second edge 11b2, and the third second edge 11b3 in the first direction X is within 0 mm to 1 mm; and the distance between the relatively protruding third fourth edge 11c1, 11c2, and 11c3 in the first direction X is within 0 mm to 1 mm. In the first direction X, the shortest distance D1 between each first edge 11a and the first side surface 41 is greater than the longest distance D2 between each second edge 11b and the first side surface 41, such that the distance between each first edge 11a and the first side surface 41 is greater than the distance between each second edge 11b and the first side surface 41. In this application, the distance between each edge and the first side surface 41 refers to the distance between the first edge 11a and the surface extending from the first side surface 41 in the second direction Z. In some embodiments, the relative protruding distance between each first side 11a in the first direction X is 0, that is, the distance between each first side 11a and the first side 41 is equal and is D1; ​​the relative protruding distance between each second side 11b in the first direction X is 0, that is, the distance between each second side 11b and the first side 41 is equal and is D2.

[0128] In the second direction Z, two or more consecutive first edges 11a constitute a first edge group 11A, and two or more consecutive second edges 11b constitute a second edge group 11B. The shortest distance between each first edge 11a in the first edge group 11A and the first side surface 41 is greater than the longest distance between each second edge 11b in the second edge group 11B and the first side surface 41, such that the distance between each first edge 11a in the first edge group 11A and the first side surface 41 is greater than the distance between each second edge 11b in the second edge group 11B and the first side surface 41. Specifically, in the first direction X, the first edge 11a in the first edge group 11A that is closest to the first side surface 41 is the edge of the first edge group 11A, and the second edge 11b in the second edge group 11B that is farthest from the first side surface 41 is the edge of the second edge group 11B.

[0129] The first cavity 401 is formed between the first edge group 11A and the housing 40, and the second cavity 402 is formed between the second edge group 11B and the housing 40. The first cavity 401 and the second cavity 402 can be used to store part of the electrolyte. When the electrolyte inside the electrode assembly 10 is consumed, the electrolyte stored in the first cavity 401 and the second cavity 402 can be replenished by capillary or pressure difference, thereby prolonging the service life of the battery. The first cavity 401 and the second cavity 402 can also be used to store the gas generated during the use of the battery, slow down the degree of swelling of the appearance of the battery, and prolong the service life. In addition, the presence of the first cavity 401 and the second cavity 402 makes the multiple edges of the electrode assembly 10 have sufficient distance with the housing 40, reduces the risk of electrode assembly 10 corner position extrusion during the falling process of the battery 100, and improves the service life.

[0130] The first conductive layer 11 further comprises a first region 114 and a first protruding portion 115. The first region 114 is provided with the first conductive material layer 112, and the first protruding portion 115 protrudes out of the first region 114 and is accommodated in the housing 40 and connected with the first conductive plate 20. In the second direction Z, the first regions 114 of part of the first conductive layers 11 in the multilayer first conductive layer 11 are continuously arranged multiple first edges 11a opposite to the first side surface 41 in the first direction X and form a first edge group 11A, and the first regions 114 of another part of the first conductive layers 11 are continuously arranged multiple second edges 11b opposite to the first side surface 41 in the first direction X and form a second edge group 11B. Figure 2The first layer of the first conductive layer 113, the second layer of the first conductive layer 116, the third layer of the first conductive layer 117, the fourth layer of the first conductive layer 118, and the fifth layer of the first conductive layer 119 are sequentially arranged in the second direction Z, and the rest of the first conductive layers 11 are not labeled. The first layer of the first conductive layer 113 includes a first first region 114a and a first protrusion 115a protruding from the first first region 114a, and a first first edge 11a 1 is an edge of the first first region 114a facing the first side 41 in the first direction X, and the first first region 114a and the first first protrusion 115a are separated by the first first edge 11a 1. The second layer of the first conductive layer 116 includes a second first region 114b and a second first protrusion 115b protruding from the second first region 114b, and a second first edge 11a 2 is an edge of the second first region 114b facing the first side 41 in the first direction X and is a boundary between the second first region 114b and the second first protrusion 115b. The third layer of the first conductive layer 117 includes a third first region 114c and a third first protrusion 115c protruding from the third first region 114c, and a first second edge 11b 1 is an edge of the third first region 114c facing the first side 41 in the first direction X and is a boundary between the third first region 114c and the third first protrusion 115c. The fourth layer of the first conductive layer 118 includes a fourth first region 114d and a fourth first protrusion 115d protruding from the fourth first region 114d, and a second second edge 11b 2 is an edge of the fourth first region 114d facing the first side 41 in the first direction X and is a boundary between the fourth first region 114d and the fourth first protrusion 115d. The fifth layer of the first conductive layer 119 includes a fifth first region 114e and a fifth first protrusion 115e, and a third second edge 11b 3 is an edge of the fifth first region 114e facing the first side 41 in the first direction X and is a boundary between the fifth first region 114e and the fifth first protrusion 115e. In this way, the first regions 114 and the first protrusions 115 of the multiple layers of the first conductive layer 11 are separated by the corresponding first edges 11a or second edges 11b. In the first direction X, the first regions 114 are closer to the third side 43 than the first edges 11a or the second edges 11b, and the first protrusions 115 are closer to the first side 41 than the first edges 11a or the second edges 11b.

[0131] In some embodiments, the first protrusions 115 generate a bend between the first regions 114 and the first side 41, so as to reduce the space occupied by the first protrusions 115 in the first direction X, facilitating the miniaturization of the electrode assembly 10.

[0132] In some embodiments, the first protrusion 115a contacts the curved surface 47 of the housing 40 at a bent portion of the housing 40 that is bent between the first region 114 and the first side surface 41.

[0133] In some embodiments, the first protrusion 115 is bent in the first cavity 401, which further reduces the space occupied by the battery 100 in the first direction X, and facilitates miniaturization of the battery 100. At least a portion of the first conductive plate 20 is accommodated in the second cavity 402 and connected to the bent first protrusion 115.

[0134] Please refer to Figure 2 and Figure 3 , the second conductive layer 12 further includes a plurality of edges opposite the first side surface 41 in the first direction X and a plurality of fifth edges 12c opposite the third side surface 43. For ease of understanding, Figure 2 and Figure 3 three fifth edges 12c 1, 12c 2, 12c 3 are shown, and the remaining fifth edges 12c are not labeled. The plurality of edges of the second conductive layer 12 opposite the first side surface 41 in the first direction X includes two or more sixth edges 12a arranged continuously in the second direction Z and two or more seventh edges 12b arranged continuously in the second direction Z. Figure 2 and Figure 3 one sixth edge 12a is shown, which is located between the two first edges 11a 1, 11a2 arranged continuously. In other embodiments, the second conductive layer 12 can include a plurality of sixth edges 12a arranged continuously in the second direction Z, and the plurality of sixth edges 12a and the plurality of first edges 11a are arranged alternately in the second direction Z. For ease of understanding, Figure 2 and Figure 3Three seventh edges 12b 1, 12b 2, 12b 3 arranged continuously in the second direction Z are shown in FIG. 12. The remaining seventh edges 12b are not shown. In the second direction Z, the three seventh edges 12b 1, 12b 2, 12b 3 arranged continuously are arranged alternately with the three second edges 11b 1, 11b 2, 11b 3 arranged continuously. In the second direction Z, two or more sixth edges 12a arranged continuously are flush with each other, two or more seventh edges 12b arranged continuously are flush with each other, and the plurality of fifth edges 12c are flush with each other. In the first direction X, the shortest distance D 3 from each sixth edge 12a to the first side surface 41 is greater than the longest distance D 4 from each seventh edge 12b to the first side surface 41, so that each sixth edge 12a is greater than each seventh edge 12b. In this embodiment, the distance by which each sixth edge 11a protrudes relative to each other in the first direction X is 0, i.e. the distance from each sixth edge 12a to the first side surface 41 is equal and is D 3; the distance by which each second edge 11b protrudes relative to each other in the first direction X is 0, i.e. the distance from each seventh edge 12b to the first side surface 41 is equal and is D 4.

[0135] In the second direction Z, two or more sixth edges 12a arranged continuously can form a similar edge group structure as the first edge group 11A, and two or more seventh edges 12b arranged continuously can form a similar edge group structure as the second edge group 11B.

[0136] The second conductive layer 12 further comprises a second region 124 and a second protrusion 125. The second region 124 is provided with the second conductive material layer 122, and the second protrusion 125 protrudes out of the second region 124 and is accommodated in the housing 40 and connected to the second conductive plate 30. The structure of the second conductive layer 12 is similar to that of the first conductive layer 11. In the plurality of second conductive layers 12 arranged in the second direction Z, the second region 124 and the second protrusion 125 of the portion of the second conductive layer 12 located in the region of the first edge group 11A are separated by the sixth edge 12a, and the second region 124 and the second protrusion 125 of the second conductive layer 12 located in the region of the second edge group 11B are separated by the seventh edge 12b. That is, the second region 124 and the second protrusion 125 of the plurality of second conductive layers 12 are separated by the corresponding sixth edge 12a or seventh edge 12b. In the first direction X, the second region 124 is closer to the third side surface 41 than the sixth edge 12a or the seventh edge 12b, and the second protrusion 125 is closer to the first side surface than the sixth edge 12a or the seventh edge 12b. In the first direction X, as viewed in the second direction Z, the distance D 13 from the second region 124 to the first side surface 41 is farther than the distance D 3 from the sixth edge 12a to the first side surface 41, and the distance D 14 from the second protrusion 125 to the first side surface 41 is closer than the distance D 3 from the sixth edge 12a to the first side surface 41. As viewed in the second direction Z, the second region 124 overlaps with the first region 114.

[0137] In some embodiments, the second protrusion 125 generates a bend between the second region 124 and the first side surface 41, so as to reduce the space occupied by the second protrusion 125 in the first direction X, facilitating the miniaturization of the electrode assembly 10.

[0138] In some embodiments, the second protrusion 125 generates a bend in the first cavity 401, so as to further reduce the space occupied by the battery 100 in the first direction X, facilitating the miniaturization of the battery 100. At least a portion of the second conductive plate 30 is accommodated in the second cavity 402 and connected to the bent first protrusion 115.

[0139] The first layer 13 includes a plurality of edges opposite to the first side surface 41 in the first direction X and a plurality of eighth edges 13c opposite to the third side surface 43. Figure 2 、 3 Three eighth edges 13c 1, 13c 2, 13c 3 are shown in FIG. 13, and the remaining eighth edges 13c are not labeled. The plurality of edges of the first layer 13 opposite to the first side surface 41 in the first direction X includes two or more ninth edges 13a arranged continuously in the second direction Z and two or more tenth edges 13b arranged continuously in the second direction Z. For ease of understanding, Figure 2 and Figure 3 Two ninth edges 13a 1, 13a 2 arranged continuously in the second direction Z and three tenth edges 13b 1, 13b 2, 13b 3 arranged continuously in the second direction Z are shown in FIG. 13, and the remaining ninth edges 13a and tenth edges 13b are not labeled. In the second direction Z, the two or more ninth edges 13a arranged continuously are flush with each other, the two or more tenth edges 13b arranged continuously are flush with each other, and the plurality of eighth edges 13c are flush with each other. In the first direction X, the shortest distance D 5 between each ninth edge 13a and the first side surface 41 is greater than the longest distance D 6 between each tenth edge 13b and the first side surface 41, so that the distance between each ninth edge 13a and the first side surface 41 is greater than the distance between each tenth edge 13b and the first side surface 41. In this embodiment, the distance between each ninth edge 13a and the first side surface 41 is equal and is D 5, and the distance between each tenth edge 13b and the first side surface 41 is equal and is D 6.

[0140] In some embodiments, in the second direction Z, the plurality of fourth edges 11c arranged continuously form a fourth edge group 11D, and the plurality of fifth edges 12c and the plurality of eighth edges 13c arranged continuously can form edge group structures similar to the fourth edge group 11D, respectively. In the first direction X, among the three fifth edges 12c, eighth edges 13c and fourth edges 11c arranged continuously in the second direction Z, the eighth edges 13c protrude out of the fifth edges 12c and the fourth edges 11c, and the fifth edges 12c protrude out of the fourth edges 11c.

[0141] Please refer toFigure 4 The first conductive layer 11 further comprises a plurality of eleventh edges 11d opposite to the second side 42 in the third direction Y and a plurality of twelfth edges 11e opposite to the fourth side 44, the second conductive layer 12 further comprises a plurality of thirteenth edges 12d opposite to the second side 42 in the third direction Y and a plurality of fourteenth edges 12e opposite to the fourth side 44, and the first layer 13 further comprises a plurality of fifteenth edges 13d opposite to the second side 42 in the third direction Y and a plurality of sixteenth edges 13e opposite to the fourth side 44. Figure 4 Three of the eleventh edges 11d 1, 11d2, 11d3, three of the twelfth edges 11e 1, 11e2, 11e3, three of the thirteenth edges 12d 1, 12d2, 12d3, three of the fourteenth edges 12e 1, 12e2, 12e3, three of the fifteenth edges 13d 1, 13d2, 13d3 and three of the sixteenth edges 13e 1, 13e2, 13e3 are shown in FIG. 6, and the rest of the eleventh edges 11d, the twelfth edges 11e, the thirteenth edges 12d, the fourteenth edges 12e, the fifteenth edges 13d and the sixteenth edges 13e are not labeled. In the second direction Z, the plurality of the eleventh edges 11d, the plurality of the twelfth edges 11e, the plurality of the thirteenth edges 12d, the plurality of the fourteenth edges 12e, the plurality of the fifteenth edges 13d and the plurality of the sixteenth edges 13e are each independently flush with each other. In this embodiment, the distance from each of the eleventh edges 11d, each of the thirteenth edges 12d and each of the fifteenth edges 13d to the second side 42 is equal, and the distance from each of the twelfth edges 11e, each of the fourteenth edges 12e and each of the sixteenth edges 13e to the fourth side 44 is equal; and in the third direction Y, each of the thirteenth edges 12d protrudes outwardly from each of the eleventh edges 11d, each of the fifteenth edges 13d protrudes outwardly from each of the thirteenth edges 12d, each of the fourteenth edges 12e protrudes outwardly from each of the twelfth edges 11e, and each of the sixteenth edges 13e protrudes outwardly from each of the twelfth edges 11e. In the second direction Z, the plurality of the eleventh edges 11d arranged continuously form a fifth edge group 11E, the plurality of the thirteenth edges 12d arranged continuously and the plurality of the fifteenth edges 13d arranged continuously can form edge group structures similar to the fifth edge group 11E respectively, and the plurality of the twelfth edges 11e arranged continuously form a sixth edge group 11F, the plurality of the fourteenth edges 12e arranged continuously and the plurality of the sixteenth edges 13e arranged continuously can form edge group structures similar to the sixth edge group 11F respectively.

[0142] Please refer to Figures 1 to 4The electrode assembly 10 has a length L in the first direction X and a length W in the third direction Y. The first layer 13 in the first edge group 11A has a length L1 in the first direction X, and the first layer 13 in the second edge group 11B has a length L2 in the first direction X, where L1 < L2 < L. The first layer 13 in the first edge group 11A has a length W1 in the third direction Y, and the first layer 13 in the second edge group 11B has a length W2 in the third direction Y, where W1 is equal to W2 and W.

[0143] Referring to Figure 5 In some embodiments, the electrode assembly 10 is formed by a plurality of first conductive layers 11, a plurality of second conductive layers 12, and a first layer 13. The first layer 13 is folded in a zigzag pattern in the second direction Z and has a plurality of layers when viewed in the third direction Y. In the second direction Z, each layer of the first layer 13 separates two adjacent first conductive layers 11 and two adjacent second conductive layers 12.

[0144] Referring to Figure 6A In some embodiments, at least a portion of the first conductive plate 20 is accommodated in the first cavity 402, and the first protrusion 115 is bent in the first cavity 401 and connected to the first conductive plate 20 accommodated in the first cavity 402, so as to further reduce the space occupied by the battery 100 in the first direction X, thereby facilitating the miniaturization of the battery 100.

[0145] Referring to Figure 6B In some embodiments, the first protrusion 115 is bent in the second cavity 402, and at least a portion of the first conductive plate 20 is accommodated in the second cavity 402 and connected to the bent first protrusion 115. Referring to Figure 7 In some embodiments, the electrode assembly 10 has a curved portion 101 extending in the first direction X and protruding in the second direction Z. The first conductive layer 11, the second conductive layer 12, and the first layer 13 in the curved portion 101 are all bent in the second direction Z toward the same side. In this embodiment, in the second direction Z, the curved portion 101 is bent in the direction from the first edge group 11A to the second edge group 11B, so that the curved portion 101 has a portion protruding in the direction from the second edge group 11B to the first edge group 11A. When viewed in the second direction Z, the straight line connecting two adjacent first edges 11a in the first edge group 11A, the straight line connecting two adjacent sixth edges 12a, and the straight line connecting two adjacent ninth edges 13a all intersect the straight line coinciding with the first side surface 41, and the straight line connecting two adjacent second edges 11b in the second edge group 11B, the straight line connecting two adjacent seventh edges 12b, and the straight line connecting two adjacent tenth edges 13b all intersect the straight line coinciding with the first side surface 41. In this embodiment, the first side surface 41 is a plane. Figure 7A first straight line A connecting two adjacent first sides 11a in the first side group 11A intersects with a second straight line B coinciding with the first side 41 at a point O.

[0146] Referring to Figure 8 and Figure 9 In some embodiments, the plurality of edges of the first conductive layer 11 opposite to the first side 41 in the first direction X further comprises two or more third edges 11f arranged continuously in the second direction Z. For the purpose of better understanding, Figure 9 In the embodiment, three first third edges 11f1, 11f2, 11f3 arranged continuously in the second direction Z are shown, and the rest of the third edges 11f are not shown. In the second direction Z, the two or more third edges 11f arranged continuously are flush with each other. In the first direction X, the longest distance D7 between each third edge 11f and the first side 41 is smaller than the shortest distance D2 between each second edge 11b and the first side 41, so that the distance between each third edge 11f and the first side 41 is smaller than the distance between each second edge 11b and the first side 41. In the embodiment, the distance between each second edge 11b and the first side 41 is equal and is D2, and the distance between each third edge 11f and the first side 41 is equal and is D7. The two or more third edges 11f arranged continuously in the second direction Z form a third side group 11C, and the distance between each second edge 11b in the second side group 11B and the first side 41 is greater than the distance between each third edge 11f in the third side group 11C and the first side 41.

[0147] The plurality of edges of the second conductive layer 12 opposite to the first side 41 in the first direction X further comprises two or more seventeenth edges 12f arranged continuously in the second direction Z, and the plurality of edges of the first layer 13 opposite to the first side 41 in the first direction X further comprises two or more eighteenth edges 13f arranged continuously in the second direction Z. For the purpose of better understanding, Figure 9 In the embodiment, three first third edges 11f1, 11f2, 11f3 arranged continuously in the second direction Z are shown, and the rest of the third edges 11f are not shown. In the second direction Z, the two or more third edges 11f arranged continuously are flush with each other and can form a side group structure similar to the third side group 11C, and the two or more eighteenth edges 13f arranged continuously are flush with each other and can form a side group structure similar to the third side group 11C. In the embodiment, the distance between each seventh edge 12b and the first side 41 is equal and is D4, the distance between each tenth edge 13b and the first side 41 is equal and is D6, the distance between each seventeenth edge 12f and the first side 41 is equal and is D8, and the distance between each eighteenth edge 13f and the first side 41 is equal and is D9.

[0148] Referring to Figure 10In some embodiments, two or more first edges 11a arranged continuously in the second direction Z also constitute a third edge group 11C'. In the second direction Z, the first edge group 11A and the third edge group 11C' are located on two sides of the second edge group 11B.

[0149] Referring to Figure 11 Embodiments of the present application also provide an electronic device 200, which comprises a main body 220 and a battery 100. The battery 100 is accommodated in the main body 220. The electronic device 200 can be one of a mobile phone, a tablet computer, and an e-reader.

[0150] In the present application, the electronic device 200 is exemplified by a mobile phone, the battery 100 is arranged in the mobile phone to provide power for the mobile phone, and the main body 220 is the structure of the mobile phone. It can be understood that in other embodiments, the electronic device 200 can also have other structures, and is not limited to the above-mentioned mobile phone, tablet computer, and e-reader.

[0151] The electrode assembly of the battery provided by the present application is provided with a first edge group and a second edge group on the side connected with the conductive plate, forming a stepped edge structure; and a stable cavity structure is formed between the electrode assembly and the shell through the first edge group, the second edge group, and the side surface of the shell, which can be used to store electrolyte and gas, thereby prolonging the service life of the battery; and due to the existence of the cavity structure, the electrode assembly and the shell have sufficient distance, which can reduce the risk of electrode assembly corner extrusion and shell damage during the falling process, thereby improving the service life.

[0152] The performance of the battery provided by the present application is described below through specific embodiments and comparative examples.

[0153] Embodiment 1

[0154] The first conductive layer 11 and the second conductive layer 12 are arranged on both sides of the first layer 13 to form an electrode assembly 10, the electrode assembly 10 is loaded into the shell 40, and after injection, packaging, and formation, a finished battery as shown in Figure 4 is obtained. In the first direction X, the length of the first conductive layer 11 in the second edge group 11B is 5 mm longer than the length of the first layer 13 in the first edge group 11A; in the first direction X, the length of the second conductive layer 12 in the first edge group 11A is 2.5 mm longer than the length of the first conductive layer 11, and the length of the first layer 13 is 2.5 mm longer than the length of the second conductive layer 12; in the first direction X, the length of the second conductive layer 12 in the second edge group 11B is 2.5 mm longer than the length of the first conductive layer 11, and the length of the first layer 13 is 2.5 mm longer than the length of the second conductive layer 12.

[0155] Embodiment 2

[0156] An electrode assembly 10 is formed by placing a first conductive layer 11 and a second conductive layer 12 on both sides of a first layer 13. The electrode assembly 10 is then installed into a housing 40, and after liquid injection, encapsulation, and formation, the desired result is obtained. Figure 10 The finished battery shown is as follows: In the first direction X, the length of the first conductive layer 11 located in the second side group 11B is 5 mm longer than the length of the first layer 13 located in the first side group 11A (third side group 11C); in the first direction X, the length of the second conductive layer 12 in the first side group 11A (third side group 11C) is 2.5 mm longer than the length of the first conductive layer 11, and the length of the first layer 13 is 2.5 mm longer than the length of the second conductive layer 12; in the first direction X, the length of the second conductive layer 12 in the second side group 11B is 2.5 mm longer than the length of the first conductive layer 11, and the length of the first layer 13 is 2.5 mm longer than the length of the second conductive layer 12.

[0157] Example 3

[0158] An electrode assembly 10 is formed by placing a first conductive layer 11 and a second conductive layer 12 on both sides of a first layer 13. The electrode assembly 10 is then installed into a housing 40, and after liquid injection, encapsulation, and formation, the desired result is obtained. Figure 8 The finished battery shown is as follows. In the first direction X, the length of the first conductive layer 11 located in the second side group 11B is 1 mm longer than the length of the first layer 13 located in the first side group 11A; in the first direction X, the length of the second conductive layer 12 in the first side group 11A is 0.4 mm longer than the length of the first conductive layer 11, and the length of the second conductive layer 12 in the second side group 11B is 0.4 mm longer than the length of the first conductive layer 11.

[0159] Comparative Example 1

[0160] An electrode assembly is formed by placing a first conductive layer and a second conductive layer on both sides of the first layer. The electrode assembly is then installed into a casing, and the finished battery is obtained after liquid injection, encapsulation, and formation. Specifically, in the second direction Z, multiple edges of the first conductive layer and the side of the casing are flush with each other, multiple edges of the second conductive layer and the side of the casing are flush with each other, and multiple edges of the first layer and the side of the casing are flush with each other. The edge of the second conductive layer extends 1.5 mm beyond the edge of the first conductive layer, and the edge of the first layer extends 2.5 mm beyond the edge of the second conductive layer.

[0161] Five samples of batteries from each of the examples and comparative examples were subjected to cycle testing and drop testing. The test results are shown in Table 1.

[0162] Cycling test: charge the battery sample at 25℃ with a current of 0.2C, then discharge the battery to the cut-off voltage; then charge the battery with a current of 0.8C to the limit voltage, and observe whether the appearance of the battery is abnormal (such as local thickness increase); then perform 1000 cycles on the battery with a charge-discharge current of 0.8C / 1C, and obtain the capacity retention rate and the electrode assembly expansion coefficient.

[0163] Drop test: at room temperature, charge the battery sample to the limit voltage with a current of 0.2C, fix the battery sample in a drop test box, and drop the battery sample from a height of 1.8m onto a marble slab, with one round of dropping in the order of first surface downward, second surface downward, head plane downward, left side plane downward, bottom plane downward, and right side plane downward. After each round of dropping, observe whether the surface of the electrode assembly is damaged, and measure the open circuit voltage of the battery sample; if the voltage is less than 3V, the drop test is determined to fail; if the voltage is higher than 3V, the drop test is determined to pass.

[0164] Table 1

[0165]

[0166] Note: X / 5 means that the number of samples passing the drop test in 5 samples is X.

[0167] From the test results in Table 1, it can be seen that, compared with Comparative Examples 1-3 and Comparative Example 1, by setting the first edge group and the second edge group, the service life of the battery can be improved.

[0168] The above disclosure is only the preferred embodiments of the present application, and of course cannot be used to limit the present application, so equivalent changes made according to the present application still fall within the scope of the present application.

Claims

1. A battery, characterized by, An electrode assembly includes: an electrode assembly including a first conductive layer, a second conductive layer, and a first layer disposed between the first conductive layer and the second conductive layer, the first layer containing an insulating material; a first conductive plate connected to the first conductive layer and extending from the first conductive layer in a first direction; and a case covering the electrode assembly and covering at least a portion of the first conductive plate, wherein the case includes a first side surface opposite the electrode assembly in the first direction, the first conductive layer includes a plurality of edges opposite the first side surface in the first direction, the plurality of edges includes a first edge group including two or more first edges continuously disposed in a second direction perpendicular to the first direction, and a second edge group including two or more second edges continuously disposed in the second direction, each first edge in the first edge group is farther from the first side surface than each second edge in the second edge group in the first direction, a length of the electrode assembly in the first direction is L, a length of the first layer in the first direction in the first edge group is L1, and a length of the second layer in the first direction in the second edge group is L2, where L1 < L2 < L. The electrode assembly has a curved portion extending in the first direction and protruding in the second direction.

2. The battery of claim 1, wherein, The electrode assembly has a portion protruding in a direction from the second edge group to the first edge group in the second direction.

3. The battery of claim 2, wherein the cathode is a lithium cobalt oxide cathode. When viewed in the second direction, the first edge group and the first side surface are disposed such that a first straight line connecting two adjacent first edges in the first edge group intersects a second straight line coinciding with the first side surface.

4. The battery of claim 2, wherein the cathode comprises a lithium metal oxide. The electrode assembly is formed by stacking or winding the first conductive layer, the first layer, and the second conductive layer, and a winding axis direction of the electrode assembly is the first direction.

5. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. When viewed in the second direction, the first conductive layer includes a first region farther from the first side surface than the first edges in the first direction, and a first protrusion closer to the first side surface than the first edges in the first direction.

6. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The first protrusion creates a bend between the first region and the first side surface.

7. The battery of claim 6, wherein the cathode comprises a lithium metal oxide. The first protrusion creates a bend in a first cavity formed between the first edge group and the case.

8. The battery of claim 7, wherein the cathode is a lithium cobalt oxide cathode. The first conductive layer is a positive electrode.

9. The battery of any one of claims 1-8, wherein, The first conductive layer includes a first conductor layer including aluminum.

10. The battery of any one of claims 1-8, wherein the cathode comprises a lithium metal oxide. The second conductive layer is a negative electrode.

11. The battery of any one of claims 1-8, wherein the cathode comprises a lithium metal oxide. The second conductive layer includes a second conductor layer including copper.

12. The battery of any one of claims 1-8, wherein, A second cavity is formed between the second edge group and the case.

13. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. An electronic device including the battery of any one of claims 1 to 13.

14. An electronic device, comprising: ​

Images