Battery cell, battery, and electric device

Abstract

This application discloses a battery cell, a battery, and an electrical device; the battery cell includes an electrode assembly and a housing, the electrode assembly is located inside the housing, the housing includes a first sidewall and a second sidewall; a first arcuate portion is connected between the first sidewall and the second sidewall, the first arcuate portion is disposed opposite to the edge of the electrode assembly, and at least a portion of the first arcuate portion is provided with a first clearance groove for avoiding the edge corresponding to the electrode assembly.

Description

Battery cell, battery and electric device

[0001] The present application claims priority to the Chinese patent application No. 202421366022.5, filed on June 14, 2024 in the China Patent Office, and entitled "Battery cell, battery and electric device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of battery energy density, and in particular relates to a battery cell, a battery and an electric device. BACKGROUND

[0003] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] The battery includes one or more battery cells to meet different capacity use requirements; however, in the technology of battery cells, how to improve the energy density of the battery cell is an important research direction.

[0005] The above statements are only used to provide background technical information related to the present application, and do not necessarily constitute the prior art.

[0006] CONTENT OF THE APPLICATION

[0007] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electric device, including but not limited to improving the volumetric energy density of the battery cell.

[0008] The technical solution adopted by the embodiments of the present application is:

[0009] In a first aspect, a battery cell is provided, which includes an electrode assembly and a housing, the electrode assembly is located in the housing, and the housing includes a first side wall and a second side wall; a first arc-shaped portion is connected between the first side wall and the second side wall, the first arc-shaped portion is arranged opposite to an edge of the electrode assembly, and at least a part of the first arc-shaped portion is provided with a first avoiding groove for avoiding the corresponding edge of the electrode assembly.

[0010] The battery cell of the embodiment of the application is characterized in that the electrode assembly is installed in the shell, the first arc-shaped part is arranged between the first side wall and the second side wall of the shell, the first arc-shaped part is connected to the first side wall and the second side wall in a smooth transition manner, stress concentration is reduced, the structural strength of the shell is improved, and the molding of the shell is facilitated; the first arc-shaped part is arranged opposite to the edge of the electrode assembly, the first arc-shaped part is provided with the first avoiding groove for avoiding the edge of the electrode assembly, the first avoiding groove can avoid the edge of the electrode assembly, the interference risk between the edge of the electrode assembly and the first arc-shaped part is reduced, thus the insulating plate can be omitted or thinned, a larger volume of electrode assembly can be installed in the shell, and the volume energy density of the battery cell is improved.

[0011] In some embodiments, the first side wall is provided with a second avoiding groove near the edge of the first arc-shaped part, and the first avoiding groove and the second avoiding groove are communicated and jointly form the avoiding groove for avoiding the corresponding edge of the electrode assembly.

[0012] By adopting the technical scheme of the embodiment, the avoiding groove extends to the first side wall, the thickness of the edge of the first side wall near the first arc-shaped part can be reduced, and the molding of the shell is facilitated.

[0013] In some embodiments, the second side wall is provided with a third avoiding groove near the edge of the first arc-shaped part, and the first avoiding groove and the third avoiding groove are communicated and jointly form the avoiding groove for avoiding the corresponding edge of the electrode assembly.

[0014] By adopting the technical scheme of the embodiment, the avoiding groove extends to the second side wall, the thickness of the edge of the second side wall near the first arc-shaped part can be reduced, and the molding of the shell is facilitated.

[0015] In some embodiments, the first side wall is provided with a second avoiding groove near the edge of the first arc-shaped part, the second side wall is provided with a third avoiding groove near the edge of the first arc-shaped part, and the first avoiding groove, the second avoiding groove and the third avoiding groove are communicated and jointly form the avoiding groove for avoiding the corresponding edge of the electrode assembly.

[0016] By adopting the technical scheme of the embodiment, the avoiding groove extends to the first side wall and the second side wall, the thickness of the edge of the first side wall near the first arc-shaped part and the thickness of the edge of the second side wall near the first arc-shaped part can be reduced, and the molding of the shell is facilitated.

[0017] In some embodiments, the groove wall surface of the avoiding groove comprises a circular arc surface, the circular arc surface is arranged on the first arc-shaped part, and the circular arc surface is connected between the inner wall surface of the first side wall and the inner wall surface of the second side wall.

[0018] By adopting the technical scheme of the embodiment, the inner wall surface of the first side wall and the inner wall surface of the second side wall can be smoothly connected through the arc surface, so that stress concentration is reduced and the structural strength of the shell is improved.

[0019] In some embodiments, the groove wall surface of the avoiding groove further comprises a first connecting surface, the first connecting surface is arranged on the first side wall, the first connecting surface is connected between the arc surface and the inner wall surface of the first side wall, and the first connecting surface is inclined or perpendicular to the inner wall surface of the first side wall.

[0020] By adopting the technical scheme of the embodiment, the structure of the avoiding groove can be flexibly set to meet different requirements.

[0021] In some embodiments, the groove wall surface of the avoiding groove further comprises a first plane, the first plane is arranged on the first side wall; the first plane is connected between the first connecting surface and the arc surface, and the first plane is parallel to the inner wall surface of the first side wall.

[0022] By adopting the technical scheme of the embodiment, the first plane is arranged, so that there is a planar transition region between the arc surface and the first connecting surface, which facilitates shell forming; in addition, the structure is regular and convenient to process.

[0023] In some embodiments, the other side of the arc surface is tangent to the inner wall surface of the second side wall.

[0024] By adopting the technical scheme of the embodiment, the arc surface is tangent to the inner wall surface of the second side wall, and the arc surface and the inner wall surface of the second side wall are smoothly connected, which is beneficial to reduce stress concentration and improve the structural strength of the shell.

[0025] In some embodiments, the edge portion of the second side wall close to the first arc-shaped portion is provided with a third avoiding groove, the first avoiding groove, the second avoiding groove and the third avoiding groove are communicated and jointly surround to form an avoiding groove for avoiding the corresponding edge of the electrode assembly; the groove wall surface of the avoiding groove further comprises a second connecting surface, the second connecting surface is arranged on the second side wall, the second connecting surface is connected between the arc surface and the second side wall, and the second connecting surface is inclined or perpendicular to the inner wall surface of the second side wall.

[0026] By adopting the technical scheme of the embodiment, the structure of the avoiding groove can be flexibly set to meet different requirements.

[0027] In some embodiments, the groove wall surface of the avoiding groove further comprises a second plane, the second plane is arranged on the second side wall, the second plane is connected between the second connecting surface and the arc surface, and the second plane is parallel to the inner wall surface of the second side wall.

[0028] By adopting the technical scheme of the embodiment, the second plane is arranged, so that there is a planar transition region between the arc surface and the second connecting surface, which facilitates shell forming; in addition, the structure is regular and convenient to process.

[0029] In some embodiments, the radius of the circular arc surface is R1, and the size of the avoidance groove in the direction of the inner wall surface perpendicular to the second side wall is W, where 1≤W / R1≤3.

[0030] By adopting the technical scheme of this embodiment, the size of the second avoidance groove is reasonably designed, and the structural strength of the shell and the forming of the shell can be considered at the same time.

[0031] In some embodiments, 1.5≤W / R1≤2.5.

[0032] By adopting the technical scheme of this embodiment, the design of 1.5≤W / R1≤2.5 makes the size of the second avoidance groove more reasonable, and the structural strength of the shell and the forming of the shell can be better considered. In some embodiments, the groove wall surface of the avoidance groove comprises a third plane, a fourth plane and a third connecting surface connected in turn, the third plane is coplanar with the inner wall surface of the second side wall, the third plane is perpendicular to the fourth plane, and the third connecting surface is connected between the fourth plane and the inner wall surface of the first side wall.

[0033] By adopting the technical scheme of this embodiment, the third plane and the fourth plane form a right angle structure, which is simple in structure and convenient to process and manufacture.

[0034] In some embodiments, the groove depth of the first avoidance groove is h1, and the wall thickness of the first side wall is H, where 0.02≤h1 / H≤2 / 3.

[0035] By adopting the technical scheme of this embodiment, the groove depth of the first avoidance groove is reasonably designed, and the structural strength of the shell and the edge of the electrode assembly can be considered at the same time.

[0036] In some embodiments, 0.1≤h1 / H≤0.5.

[0037] By adopting the technical scheme of this embodiment, the design of 0.1≤h1 / H≤0.5 makes the size of the first avoidance groove more reasonable, and the structural strength of the shell and the edge of the electrode assembly can be better considered.

[0038] In some embodiments, the groove depth of the first avoidance groove is h1, where 0.1mm≤h1≤0.5mm.

[0039] By adopting the technical scheme of this embodiment, the groove depth of the first avoidance groove is reasonably designed, and the structural strength of the shell and the edge of the electrode assembly can be considered at the same time.

[0040] In some embodiments, 0.15mm≤h1≤0.35mm.

[0041] By adopting the technical scheme of the embodiment, the design of 0.15mm≤h1≤0.35mm makes the size design of the first avoiding groove more reasonable, and the edge of the electrode assembly and the structural strength of the shell can be better considered.

[0042] In some embodiments, the shell includes a shell body and two end covers, the shell body is provided with openings on two end faces oppositely distributed along a first direction, the electrode assembly is located in the shell body, and the two end covers are respectively covered on the two openings; the two side walls of the shell body oppositely distributed along a second direction are first side walls, the two side walls of the shell body oppositely distributed along a third direction are second side walls, and the first side wall and the adjacent second side wall are connected with a first arc-shaped part, and the first direction, the second direction and the third direction are perpendicular to each other.

[0043] By adopting the technical scheme of the embodiment, the edge of the electrode assembly extending along the first direction is correspondingly provided with the first avoiding groove for avoiding, and the avoiding effect of the electrode assembly is good; the shell adopts the structural form of the shell body and the two end covers, the structure is simple, and the assembly and sealing of the battery monomer are simple.

[0044] In some embodiments, the electrode assembly includes a plurality of pole pieces, and the plurality of pole pieces are stacked along a third direction.

[0045] By adopting the technical scheme of the embodiment, the plurality of pole pieces are stacked along the third direction, so that the electrode assembly has four edges extending along the second direction, the first avoiding groove of the four first arc-shaped parts connected between the first side wall and the second side wall can be oppositely arranged with the four edges, thereby providing an avoiding space, reducing the risk of interference between the electrode assembly and the shell, and being beneficial to improving the volume energy density and the charge-discharge performance of the battery monomer.

[0046] In some embodiments, the shell includes a shell body and an end cover, and the electrode assembly is located in the shell body; one of two end faces of the shell body oppositely distributed along a first direction is provided with an opening, and the end cover is covered on the opening; the side wall of the shell body oppositely arranged with the end cover is a first side wall, the two side walls of the shell body oppositely distributed along a second direction are second side walls, and the two side walls of the shell body oppositely distributed along a third direction are third side walls; the first arc-shaped part is connected between the opposite two sides of the first side wall and the two second side walls respectively, and the first direction, the second direction and the third direction are perpendicular to each other.

[0047] By adopting the technical scheme of the embodiment, the edge of the electrode assembly extending along the third direction is correspondingly provided with the first avoiding groove for avoiding, and the avoiding effect of the electrode assembly is good; the shell adopts the structural form of the shell body and the one end cover, the structure is simple, and the assembly and sealing of the battery monomer are simple.

[0048] In some embodiments, the electrode assembly is in a wound structure, and an axis of winding of the electrode assembly is parallel to the first direction; or the electrode assembly is in a wound structure, and an axis of winding of the electrode assembly is parallel to the second direction; or the electrode assembly includes a plurality of electrode sheets, and the plurality of electrode sheets are arranged in a stack along the first direction.

[0049] By adopting the technical scheme of this embodiment, the shell can meet the avoidance requirements of electrode assemblies of various structural forms, and has a wide range of applications.

[0050] In some embodiments, the electrode assembly is in a wound structure, and an axis of winding of the electrode assembly is parallel to the first direction, a size of the electrode assembly in the second direction is L1, and a distance between the first avoidance slot and the adjacent third side wall is L2, where 1 / 15≤L2 / L1≤0.5.

[0051] By adopting the technical scheme of this embodiment, the length of the first avoidance slot is reasonably designed, and the structural strength of the shell and the avoidance of the edges of the electrode assembly can be considered at the same time.

[0052] In some embodiments, 0.1≤L2 / L1≤0.4.

[0053] By adopting the technical scheme of this embodiment, the design of 0.1≤L3 / L1≤0.4 makes the length of the first avoidance slot more reasonably designed, and the structural strength of the shell and the avoidance of the edges of the electrode assembly can be considered better.

[0054] In some embodiments, the electrode assembly is in a wound structure, and an axis of winding of the electrode assembly is parallel to the first direction, and a distance between the first avoidance slot and the adjacent third side wall is L2, where 3mm≤L2≤8mm.

[0055] By adopting the technical scheme of this embodiment, the length of the first avoidance slot is reasonably designed, and the structural strength of the shell and the avoidance of the edges of the electrode assembly can be considered at the same time.

[0056] In some embodiments, 4mm≤L2≤6mm.

[0057] By adopting the technical scheme of this embodiment, the design of 4mm≤L2≤6mm makes the length of the first avoidance slot more reasonably designed, and the structural strength of the shell and the avoidance of the edges of the electrode assembly can be considered better.

[0058] In some embodiments, the electrode assembly is in a wound structure, and an axis of winding of the electrode assembly is parallel to the first direction, and a second arc-shaped portion is connected between opposite edges of the first side wall and two third side walls respectively, and a fourth avoidance slot is arranged on an inner side of the second arc-shaped portion, and the fourth avoidance slot is used for avoiding a vertex of an end portion adjacent to the second arc-shaped portion of the electrode assembly.

[0059] By adopting the technical scheme of the embodiment, the fourth avoiding groove of the second arc-shaped portion can avoid the vertex of the end portion of the electrode assembly, so that the fourth avoiding groove can also provide avoiding space for the vertex of the end portion of the electrode assembly during expansion of the electrode assembly, and the interference amount of the electrode assembly with the second arc-shaped portion can be reduced, the risk of decarburization and lithium precipitation of the electrode assembly caused by interference with the second arc-shaped portion can be reduced, and the charge and discharge performance of the battery monomer can be improved.

[0060] In some embodiments, the size of the electrode assembly in the second direction is L1, and the distance between the fourth avoiding groove and the adjacent second side wall is L3, wherein 1 / 15≤L3 / L1≤0.5.

[0061] By adopting the technical scheme of the embodiment, the length of the fourth avoiding groove is reasonably designed, and the structural strength of the shell and the avoiding of the electrode assembly can be considered at the same time.

[0062] In some embodiments, 0.1≤L3 / L1≤0.4.

[0063] By adopting the technical scheme of the embodiment, the design of 0.1≤L3 / L1≤0.4 makes the length of the fourth avoiding groove more reasonably designed, and the structural strength of the shell and the avoiding of the electrode assembly can be better considered.

[0064] In some embodiments, the distance between the fourth avoiding groove and the adjacent second side wall is L3, wherein 3mm≤L3≤8mm.

[0065] By adopting the technical scheme of the embodiment, the length of the fourth avoiding groove is reasonably designed, and the structural strength of the shell and the avoiding of the edge of the electrode assembly can be considered at the same time.

[0066] In some embodiments, 4mm≤L3≤6mm.

[0067] By adopting the technical scheme of the embodiment, the design of 4mm≤L3≤6mm makes the length of the fourth avoiding groove more reasonably designed, and the structural strength of the shell and the avoiding of the electrode assembly can be better considered.

[0068] In some embodiments, the groove depth of the fourth avoiding groove is h2, wherein 0.1mm≤h2≤0.3mm.

[0069] By adopting the technical scheme of the embodiment, the groove depth of the fourth avoiding groove is reasonably designed, and the avoiding of the edge of the electrode assembly and the structural strength of the shell can be considered at the same time.

[0070] In some embodiments, a third arc-shaped portion is connected between the adjacent third side wall and the second side wall, the third arc-shaped portion is connected with a fourth arc-shaped portion, one end of the fourth arc-shaped portion is connected with the first arc-shaped portion, the other end of the fourth arc-shaped portion is connected with the second arc-shaped portion, and a communication groove is arranged on the inner side of the fourth arc-shaped portion, and the communication groove communicates the first avoiding groove and the fourth avoiding groove.

[0071] By adopting the technical scheme of the embodiment, the third arc-shaped portion can smoothly connect the second side wall and the third side wall, and the fourth arc-shaped portion can smoothly connect the third arc-shaped portion and the first side wall, so that stress concentration can be reduced, and the forming of the shell is facilitated; the fourth avoiding groove is arranged to make the shell have a whole-circle groove structure, so that the thickness of the fourth arc-shaped portion can be reduced, the forming of the shell is facilitated, and the processing of the groove structure is simpler.

[0072] In some embodiments, the groove depth of the first avoiding groove is h1, and the groove depth of the communication groove is h3, and 0.2≤h3 / h1≤1.

[0073] By adopting the technical scheme of the embodiment, the groove depth of the communication groove is reasonably designed, so that the forming of the shell is facilitated, and the shell has good structural strength at the corner, which is beneficial to improving the structural strength of the shell.

[0074] In some embodiments, 0.3≤h3 / h1≤0.7.

[0075] By adopting the technical scheme of the embodiment, the groove depth of the communication groove is more reasonably designed when 0.3≤h3 / h1≤0.7, so that the forming of the shell is more facilitated, and the shell has better structural strength at the corner, which is beneficial to improving the structural strength of the shell.

[0076] In some embodiments, the groove depth of the communication groove is h3, and 0.1mm≤h3≤0.3mm.

[0077] By adopting the technical scheme of the embodiment, the groove depth of the communication groove is reasonably designed, so that the forming and structural strength of the shell can be considered at the same time.

[0078] In a second aspect, a battery cell is provided.

[0079] The battery of the embodiment of the application adopts the battery cell described above, has large volume energy density and good use reliability, has long endurance time, and has good use reliability.

[0080] In a third aspect, a battery is provided.

[0081] The battery of the embodiment of the application adopts the battery cell described above, has large volume energy density and good use reliability, has long endurance time, and has good use reliability.

[0082] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0083] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0084] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application.

[0085] Fig. 2 is a structural schematic diagram of a battery provided by some embodiments of the present application.

[0086] Fig. 3 is an exploded schematic diagram of a battery monomer provided by some embodiments of the present application.

[0087] Fig. 4 is a structural schematic diagram of the battery monomer shown in Fig. 3 after hiding the end cover.

[0088] Fig. 5 is a sectional view along line A-A in Fig. 4.

[0089] Fig. 6 is a partial enlarged view at B in Fig. 5.

[0090] Fig. 7 is a partial enlarged view at B in Fig. 5 of a battery monomer provided by another embodiment of the present application.

[0091] Fig. 8 is an exploded schematic diagram of a battery monomer provided by still another embodiment of the present application.

[0092] Fig. 9 is an exploded schematic diagram of a shell of a battery monomer provided by some embodiments of the present application.

[0093] Fig. 10 is a sectional view along line C-C in Fig. 9.

[0094] Fig. 11 is a partial enlarged view at D in Fig. 10.

[0095] Fig. 12 is a partial enlarged view at D in Fig. 10 of a shell of a battery monomer provided by another embodiment of the present application.

[0096] Fig. 13 is a partial enlarged view at D in Fig. 10 of a battery monomer provided by still another embodiment of the present application.

[0097] FIG. 14 is a partial enlarged view of the battery cell at D in FIG. 10 according to some embodiments of the present application.

[0098] FIG. 15 is a structural schematic view of a housing of a battery cell according to some embodiments of the present application.

[0099] FIG. 16 is a partial enlarged view of E in FIG. 15.

[0100] FIG. 17 is a partial enlarged view of E in FIG. 15 of a housing of a battery cell according to some embodiments of the present application.

[0101] FIG. 18 is a structural schematic view of a housing of a battery cell according to some embodiments of the present application.

[0102] FIG. 19 is a partial enlarged view of F in FIG. 18.

[0103] FIG. 20 is a partial enlarged view of F in FIG. 18 of a housing of a battery cell according to some embodiments of the present application.

[0104] FIG. 21 is a sectional view along line G-G in FIG. 18.

[0105] FIG. 22 is a partial enlarged view of H in FIG. 21.

[0106] FIG. 23 is an exploded schematic view of a battery cell according to some embodiments of the present application.

[0107] FIG. 24 is an exploded schematic view of a battery cell according to some embodiments of the present application.

[0108] In the drawings:

[0109] 1000, vehicle; 1100, battery; 1200, controller; 1300, motor; 100, battery cell; 10, electrode assembly; 10a, edge; 10b, arc line; 10c, long straight line; 11, pole piece; 12, tab; 20, outer shell; 21, end cover; 211, electrode terminal; 212, pressure relief mechanism; 22, housing; 221, first side wall; 2211, second avoiding groove; 222, second side wall; 2221, third avoiding groove; 223, third side wall; 224, first arc-shaped part; 2241, first avoiding groove; 225, second arc-shaped part; 2251, fourth avoiding groove; 226, third arc-shaped part; 227, fourth arc-shaped part; 2271, communicating groove; 228, avoiding groove; 2281, circular arc surface; 2282, first connecting surface; 2283, first plane; 2284, second connecting surface; 2285, second plane; 2286, third plane; 2287, fourth plane; 2288, third connecting surface; 30, insulation film; 200, box body; 210, first part; 220, second part. DETAILED DESCRIPTION

[0110] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0111] Unless otherwise defined, all 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 terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the present specification and claims and the aforementioned description of the drawings, the terms "comprising" and "having" and any variations thereof are intended to cover not exclusively inclusive.

[0112] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0113] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least some embodiments of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. The skilled person explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0114] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0115] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces). The meaning of "several" is one or more, unless otherwise explicitly specified.

[0116] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0117] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0118] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0119] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0120] The battery usually includes one or more battery monomers, and the number of battery monomers can be set according to the power demand. The battery monomer includes a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the adjacent two side walls of the shell are usually connected in a smooth transition by using an arc-shaped part (also called R angle) to reduce stress concentration and improve the structural strength of the shell; the edge of the electrode assembly is arranged opposite to the arc-shaped part. In order to avoid the interference between the edge of the electrode assembly and the arc-shaped part to some extent, an insulating plate is usually used to pad the electrode assembly, so that the edge of the electrode assembly is away from the arc-shaped part, but the insulating plate will occupy a part of the internal space of the shell, thereby limiting the improvement of the volume energy density of the battery monomer.

[0121] Therefore, in order to improve the volumetric energy density of the battery monomer, the battery monomer provided by the embodiments of the present application is provided, and the electrode assembly is installed in the shell. The first arc-shaped part is arranged between the first side wall and the second side wall of the shell, and the first arc-shaped part is connected to the first side wall and the second side wall in a smooth transition manner, thereby reducing stress concentration, improving the structural strength of the shell, and facilitating the molding of the shell. The first arc-shaped part is arranged opposite to the edge of the electrode assembly, and the first arc-shaped part is provided with a first avoiding groove for avoiding the edge of the electrode assembly. The first avoiding groove can avoid the edge of the electrode assembly, thereby reducing the interference risk between the edge of the electrode assembly and the first arc-shaped part. In this way, the insulating plate can be omitted or thinned, and a larger volume of electrode assembly can be installed in the shell, thereby improving the volumetric energy density of the battery monomer. In addition, during the expansion of the electrode assembly, the avoiding space provided by the first avoiding groove can also reduce the interference amount between the electrode assembly and the first arc-shaped part, thereby reducing the risk of decarburization and lithium precipitation of the electrode assembly caused by the interference with the first arc-shaped part, and improving the charge-discharge performance of the battery monomer.

[0122] The battery monomer, the battery and the power utilization device provided by the embodiments of the present application are described below.

[0123] The power utilization device provided by the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc. The power utilization device can be an energy storage device, such as an energy storage container, an energy storage cabinet, etc.

[0124] The following embodiments are described below by taking a vehicle as an example for convenience of description.

[0125] Please refer to FIG. 1. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery 1100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 1100 can be used for power supply of the vehicle 1000, for example, the battery 1100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to supply power to the motor 1300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0126] In some embodiments of the present application, the battery 1100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0127] Referring to FIG. 2, the battery 1100 includes a box body 200 and a plurality of battery cells 100 accommodated in the box body 200. The box body 200 is configured to provide accommodation space for the battery cells 100, and the box body 200 can have various structures.

[0128] For example, the box body 200 can include a first part 210 and a second part 220, the first part 210 and the second part 220 are overlapped with each other, and the first part 210 and the second part 220 together define an accommodation space for accommodating the battery cells 100. The second part 220 can be a hollow structure with one end open, and the first part 210 can be a plate structure, the first part 210 is overlapped with the open side of the second part 220 to make the first part 210 and the second part 220 together define the accommodation space; the first part 210 and the second part 220 can also be hollow structures with one side open, and the open side of the first part 210 is overlapped with the open side of the second part 220. Of course, the box body 200 formed by the first part 210 and the second part 220 can have various shapes, such as a cylinder, a cuboid, etc.

[0129] In the battery 1100, the battery cells 100 can be multiple, and the multiple battery cells 100 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 100 are connected in series and in parallel.

[0130] In some embodiments, the multiple battery cells 100 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 100 is accommodated in the box body 200; of course, the battery 1100 can also be that the multiple battery cells 100 are first connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the box body 200. The battery 1100 can also include other structures, for example, the battery 1100 can also include a busbar component for realizing the electrical connection between the multiple battery cells 100.

[0131] Each of the battery cells 100 can be a secondary battery cell or a primary battery cell, and can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell. The battery cells 100 can have a cylindrical shape, a flat shape, a cuboid shape, or other shapes.

[0132] In some embodiments, the battery 1100 can not include the box body 200, but the multiple battery cells 100 are electrically connected and assembled into a whole through necessary fixing structures and then assembled into an electric device.

[0133] The battery cell 100 according to the embodiments of the present application will be described below in combination with FIGS. 3-24.

[0134] For the convenience of understanding and description, only the battery cell 100 in the shape of a cuboid is described in the embodiments provided by the present application, and it should be understood that the embodiments provided by the present application are also applicable to the battery cell 100 in the shape of a cylinder or a prism.

[0135] Referring to FIGS. 3-24, the battery cell 100 has a height direction, a length direction and a width direction, and the outer shell 20 defines the outer shape of the battery cell 100, the height direction of the outer shell 20 is the height direction of the battery cell 100, the length direction of the outer shell 20 is the length direction of the battery cell 100, and the width direction of the outer shell 20 is the width direction of the battery cell 100.

[0136] For example, referring to FIGS. 3-7, the height direction of the battery cell 100 can refer to the Z direction in the figure, the width direction of the battery cell 100 can refer to the Y direction in the figure, and the length direction of the battery cell 100 can refer to the X direction in the figure.

[0137] For example, referring to FIGS. 8-23, the height direction of the battery cell 100 can refer to the X direction in the figure, the width direction of the battery cell 100 can refer to the Y direction in the figure, and the length direction of the battery cell 100 can refer to the Z direction in the figure.

[0138] For example, referring to FIG. 24, the height direction of the battery cell 100 can refer to the Y direction in the figure, the width direction of the battery cell 100 can refer to the X direction in the figure, and the length direction of the battery cell 100 can refer to the Z direction in the figure.

[0139] Referring to FIGS. 3-6, in some embodiments of the present application, a battery cell 100 is provided, which includes an electrode assembly 10 and an outer shell 20, the electrode assembly 10 is located in the outer shell 20, and the outer shell 20 includes a first side wall 221 and a second side wall 222; a first arc-shaped portion 224 is connected between the first side wall 221 and the second side wall 222, the first arc-shaped portion 224 is arranged opposite to the edge 10a of the electrode assembly 10, and at least a section of the first arc-shaped portion 224 is provided with a first avoiding groove 2241 for avoiding the corresponding edge 10a of the electrode assembly 10.

[0140] The shell 20 refers to a housing structure with a space inside to accommodate and protect the electrode assembly 10. The shell 20 can be made of a material with certain hardness and strength, so that the shell 20 is not easy to deform when being squeezed and collided, so that the battery monomer 100 can have higher structural strength, and the reliability can also be improved. The material of the shell 20 can be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0141] In some examples, the shell 20 can be a sealed structure or a non-sealed structure. As an example, when the shell 20 is a sealed structure, the shell 20 can protect the electrode assembly 10 and prevent leakage of electrolyte and the like. When the shell 20 is a non-sealed structure, the shell 20 can protect the electrode assembly 10, and a sealing bag can be further included between the shell 20 and the electrode assembly 10, which is used to package the electrode assembly 10 and electrolyte and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film.

[0142] For example, referring to FIG. 3, the shell 20 includes a housing 22 and an end cover 21, which refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery monomer 100 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cover 21 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 21 is not easy to deform when being squeezed and collided, so that the battery monomer 100 can have higher structural strength, and the reliability can also be improved. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0143] The housing 22 is used to fit the end cover 21 to form the internal environment of the battery monomer 100, wherein the formed internal environment can be used to accommodate the electrode assembly 10. The housing 22 and the end cover 21 can be independent components, and an opening can be provided on the housing 22, and the end cover 21 is covered on the opening to form the internal environment of the battery monomer 100. Without limitation, the end cover 21 and the housing 22 can also be integrated; the end cover 21 and the housing 22 can form a common connecting surface before other components enter the shell, and when it is necessary to package the inside of the housing 22, the end cover 21 is covered on the housing 22. The shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 10. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. For example, the number of end covers 21 is one or two.

[0144] For example, referring to FIGS. 3, 8, 23 and 24, the shape of the shell 22 defines the shape of the outer shell 20, the height direction of the shell 22 is the height direction of the outer shell 20, the width direction of the shell 22 is the width direction of the outer shell 20, and the length direction of the shell 22 is the length direction of the outer shell 20.

[0145] The electrode assembly 10 is a component in which an electrochemical reaction occurs in the battery cell 100. One or more electrode assemblies 10 can be contained within the outer shell 20.

[0146] For example, the electrode assembly 10 includes a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell 100 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab.

[0147] For example, in a lithium ion battery cell, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon, silicon, lithium metal, or lithium alloy, etc. In order to ensure that the fuse does not occur when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly 10 in the embodiments of the present application includes but is not limited to a winding type structure or a stacked type structure. For convenience of description, the positive electrode sheet and the negative electrode sheet are collectively referred to as the electrode sheet 11, and the positive electrode tab and the negative electrode tab are collectively referred to as the electrode tab 12.

[0148] The edge 10a of the electrode assembly 10 can refer to an intersection line formed by two adjacent surfaces of the electrode assembly 10, and the intersection line is easy to interfere with the outer shell 20.

[0149] Among the two adjacent side walls of the outer shell 20, one side wall is a first side wall 221, and the other side wall is a second side wall 222, a first arc-shaped portion 224 is connected between the first side wall 221 and the second side wall 222, the first arc-shaped portion 224 can refer to a structure for smoothly connecting the first side wall 221 and the second side wall 222, and the edge 10a of the electrode assembly 10 is arranged opposite to the first arc-shaped portion 224 after the electrode assembly 10 is installed in the outer shell 20.

[0150] For example, referring to FIGS. 6, 7, 11-14, the first arc-shaped portion 224 is a chamfered structure, and the chamfered structure closest to the edge 10a of the electrode assembly 10 can be referred to as the first arc-shaped portion 224. The boundary between the first side wall 221 and the first arc-shaped portion 224 can be referred to as the dashed line N in the drawing, and the boundary between the second side wall 222 and the first arc-shaped portion 224 can be referred to as the dashed line M in the drawing.

[0151] For example, referring to FIG. 3, the electrode assembly 10 is a laminated structure, and the electrode assembly 10 includes a plurality of electrode plates 11 stacked in the height direction of the battery cell 100. Two end covers 21 are respectively provided at the left and right openings of the housing 22. After the electrode assembly 10 is placed in the housing 22, the two edges of the lower electrode plates 11 distributed in the width direction of the battery cell 100 and the two edges of the upper electrode plates 11 distributed in the width direction of the battery cell 100 are prone to interfere with the shell 20. The two edges of the lower electrode plates 11 distributed in the width direction of the battery cell 100 can be referred to as the edges 10a of the electrode assembly 10, and the two edges of the upper electrode plates 11 distributed in the width direction of the battery cell 100 can also be referred to as the edges 10a of the electrode assembly 10. The bottom wall and the top wall of the housing 22 can be referred to as the second side wall 222, the front wall and the rear wall of the housing 22 can be referred to as the first side wall 221, and the four chamfered structures connected between the first side wall 221 and the second side wall 222 can be referred to as the first arc-shaped portion 224.

[0152] For example, referring to FIG. 23, the electrode assembly 10 is a laminated structure, and the electrode assembly 10 includes a plurality of electrode plates 11 stacked in the height direction of the battery cell 100. The end cover 21 is provided at the upper opening of the housing 22. After the electrode assembly 10 is placed in the housing 22, the edge of the lower electrode plate 11 distributed in the width direction of the battery cell 100 is prone to interfere with the housing 22. The two edges of the lower electrode plates 11 distributed in the width direction of the battery cell 100 can be referred to as the edges 10a of the electrode assembly 10. The bottom wall of the housing 22 can be referred to as the first side wall 221, the left wall and the right wall of the housing 22 can be referred to as the second side wall 222, and the two chamfered structures connected between the first side wall 221 and the second side wall 222 can be referred to as the first arc-shaped portion 224.

[0153] For example, referring to FIG. 8, the electrode assembly 10 can have a winding flat structure, and the end cap 21 is provided on the upper opening of the case 22. After the electrode assembly 10 is put into the case 22, the winding axis (see line g) of the electrode assembly 10 is parallel or close to parallel to the height direction of the battery cell 100. The top surface of the electrode assembly 10 leads to the tab 12, and in the edge line of the bottom surface of the electrode assembly 10, the two ends are arc lines 10b, and the middle part is a long straight line 10c or similar to the long straight line 10c. After the electrode assembly 10 is put into the case 20, the long straight line 10c is easy to interfere with the case 20, and the long straight line 10c can be referred to as the edge 10a of the electrode assembly 10. The long straight line 10c can refer to the edge line of the lower end of the outermost one circle of the electrode assembly 10. The bottom wall of the case 22 can be referred to as the first side wall 221, the front wall and the rear wall of the case 22 can be referred to as the second side wall 222, and the two rounded corner structures connected between the first side wall 221 and the second side wall 222 can be referred to as the first arc-shaped part 224.

[0154] For example, referring to FIG. 24, the electrode assembly 10 can have a winding flat structure, and the end cap 21 is provided on the right opening of the case 22. After the electrode assembly 10 is put into the case 22, the winding axis (see line g) of the electrode assembly 10 is parallel or close to parallel to the height direction of the battery cell 100. The top surface of the electrode assembly 10 leads to the tab 12 on the right side, and in the edge line of the bottom surface of the electrode assembly 10, the two ends are arc lines 10b, and the middle part is a long straight line 10c or similar to the long straight line 10c. In the edge line of the top surface of the electrode assembly 10, the two ends are arc lines 10b, and the middle part is also a long straight line 10c or similar to the long straight line 10c. After the electrode assembly 10 is put into the case 20, the long straight line 10c on the left side of the top and bottom of the electrode assembly 10 is easy to interfere with the case 20, and the long straight line 10c on the left side of the top and bottom of the electrode assembly 10 can be referred to as the edge 10a of the electrode assembly 10. The long straight line 10c can refer to the edge line of the top and bottom of the outermost one circle of the electrode assembly 10. The left wall of the case 22 can be referred to as the first side wall 221, the bottom wall and the top wall of the case 22 can be referred to as the second side wall 222, and the two rounded corner structures connected between the first side wall 221 and the second side wall 222 can be referred to as the first arc-shaped part 224.

[0155] At least a part of the first arc-shaped part 224 is provided with a first avoiding groove 2241 for avoiding the corresponding edge 10a of the electrode assembly 10. It can be understood that the inner side of the first arc-shaped part 224 is provided with the first avoiding groove 2241, the first avoiding groove 2241 is arranged opposite to the edge 10a of the electrode assembly 10, and the first avoiding groove 2241 can avoid the edge 10a of the electrode assembly 10. The first arc-shaped part 224 can be partially provided with the first avoiding groove 2241, or the first arc-shaped part 224 can be entirely provided with the first avoiding groove 2241, that is, the first avoiding groove 2241 can penetrate through the first arc-shaped part 224.

[0156] For example, referring to FIGS. 3 and 4, the length of the first arc-shaped part 224 is greater than the length of the corresponding edge 10a of the electrode assembly 10. The first arc-shaped part 224 can be provided with the first avoiding groove 2241 in the corresponding section of the electrode assembly 10, or the entire section of the first arc-shaped part 224 can be provided with the first avoiding groove 2241. The length of the first avoiding groove 2241 can be greater than or equal to the length of the edge 10a of the electrode assembly 10, so as to avoid the entire edge 10a of the electrode assembly 10.

[0157] For example, the first avoiding groove 2241 penetrates through the first arc-shaped part 224 along the length direction of the first arc-shaped part 224.

[0158] Of course, in other examples, the length of the first avoiding groove 2241 can also be less than the length of the edge 10a of the electrode assembly 10, so as to avoid part of the edge 10a of the electrode assembly 10.

[0159] The battery monomer 100 of the embodiment of the application is provided with the first arc-shaped part 224 between the first side wall 221 and the second side wall 222 of the shell 20, the first arc-shaped part 224 is connected to the first side wall 221 and the second side wall 222 in a smooth transition manner, stress concentration is reduced, the structural strength of the shell 20 is improved, and the molding of the shell 20 is facilitated. The first arc-shaped part 224 is arranged opposite to the edge 10a of the electrode assembly 10, the first arc-shaped part 224 is provided with the first avoiding groove 2241 for avoiding the edge 10a of the electrode assembly 10, the first avoiding groove 2241 can avoid the edge 10a of the electrode assembly 10, the risk of interference between the edge 10a of the electrode assembly 10 and the first arc-shaped part 224 is reduced, thus the insulating plate can be omitted or thinned, a larger volume of the electrode assembly 10 can be installed in the shell 20, and the volume energy density of the battery monomer 100 is improved. In addition, in the expansion process of the electrode assembly 10, the avoiding space provided by the first avoiding groove 2241 can also reduce the interference amount between the electrode assembly 10 and the first arc-shaped part 224, reduce the risk of decarburization and lithium precipitation of the electrode assembly 10 caused by the interference with the first arc-shaped part 224, and improve the charge-discharge performance of the battery monomer 100.

[0160] In some embodiments, the battery cell 100 further comprises electrode terminals 211, which can be arranged on the end cover 21 or the shell 22. The number of the electrode terminals 211 is two, and the two electrode terminals 211 are electrically connected with the positive and negative tabs respectively, so as to output or input electric energy of the battery cell 100.

[0161] In some embodiments, the battery cell 100 further comprises a pressure relief mechanism 212, which can be arranged on the end cover 21 or the shell 22, and the pressure relief mechanism 212 can be an explosion-proof valve, an explosion-proof sheet, etc.

[0162] In some embodiments, the battery cell 100 further comprises an insulating piece, which can be arranged on the inner side of the end cover 21, so as to isolate the electrically connected components in the shell 22 from the end cover 21, thereby reducing the risk of short circuit. For example, the insulating piece can be plastic, rubber, etc.

[0163] In some embodiments, the electrode assembly 10 is further wrapped with an insulating film 30, which is used to insulate and separate the electrode assembly 10 and the shell 20, thereby reducing the risk of short circuit and improving the use reliability of the battery cell 100. The material of the insulating film 30 can be plastic.

[0164] In some other embodiments of the present application, referring to FIGS. 4-6, the first side wall 221 is provided with a second avoiding groove 2211 near the edge of the first arc-shaped portion 224, and the first avoiding groove 2241 and the second avoiding groove 2211 are communicated and jointly form the avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10.

[0165] The avoiding groove 228 can refer to a groove structure arranged on the inner side of the shell 20 for avoiding the edge 10a of the electrode assembly 10. The avoiding groove 228 extends from the first arc-shaped portion 224 to the first side wall 221. The part of the avoiding groove 228 located on the first side wall 221 is the second avoiding groove 2211, and the part of the avoiding groove 228 located on the first arc-shaped portion 224 is the first avoiding groove 2241.

[0166] By adopting the technical scheme of the embodiment, the avoiding groove 228 extends to the first side wall 221, which can reduce the thickness of the edge of the first side wall 221 near the first arc-shaped portion 224, and facilitate the molding of the shell 20.

[0167] In some other embodiments of the present application, referring to FIG. 7, the second side wall 222 is provided with a third avoiding groove 2221 near the edge of the first arc-shaped portion 224, and the first avoiding groove 2241 and the third avoiding groove 2221 are communicated and jointly form the avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10.

[0168] The avoiding groove 228 extends from the first arc-shaped part 224 to the second side wall 222, and the part of the avoiding groove 228 on the second side wall 222 is a third avoiding groove 2221, and the part of the avoiding groove 228 on the first arc-shaped part 224 is a first avoiding groove 2241.

[0169] By adopting the technical scheme of the embodiment, the avoiding groove 228 extends to the second side wall 222, the thickness of the edge of the second side wall 222 close to the first arc-shaped part 224 can be reduced, and the molding of the shell 20 can be facilitated.

[0170] In some other embodiments of the present application, referring to FIG. 7, the edge of the first side wall 221 close to the first arc-shaped part 224 is provided with a second avoiding groove 2211, the edge of the second side wall 222 close to the first arc-shaped part 224 is provided with a third avoiding groove 2221, and the first avoiding groove 2241, the second avoiding groove 2211 and the third avoiding groove 2221 are communicated and jointly form the avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10.

[0171] The avoiding groove 228 extends from the first arc-shaped part 224 to the first side wall 221 and the second side wall 222, and the part of the avoiding groove 228 on the first side wall 221 is a second avoiding groove 2211, the part of the avoiding groove 228 on the first arc-shaped part 224 is a first avoiding groove 2241, and the part of the avoiding groove 228 on the second side wall 222 is a third avoiding groove 2221.

[0172] By adopting the technical scheme of the embodiment, the avoiding groove 228 extends to the first side wall 221 and the second side wall 222, the thickness of the edge of the first side wall 221 close to the first arc-shaped part 224 and the thickness of the edge of the second side wall 222 close to the first arc-shaped part 224 can be reduced, and the molding of the shell 20 can be facilitated.

[0173] In some other embodiments of the present application, referring to FIG. 6, the groove wall surface of the avoiding groove 228 comprises a circular arc surface 2281, the circular arc surface 2281 is arranged on the first arc-shaped part 224, and the circular arc surface 2281 is connected between the inner wall surface of the first side wall 221 and the inner wall surface of the second side wall 222.

[0174] The inner wall surface of the first side wall 221 can refer to the wall surface of the first side wall 221 facing the electrode assembly 10; in the case that the second avoiding groove 2211 is arranged on the first side wall 221, the inner wall surface of the first side wall 221 can also refer to the region of the wall surface of the first side wall 221 facing the electrode assembly 10 except the second avoiding groove 2211.

[0175] The inner wall surface of the second side wall 222 can refer to the wall surface of the second side wall 222 facing the electrode assembly 10; in the case where the third avoiding groove 2221 is formed in the second side wall 222, the inner wall surface of the second side wall 222 can also refer to the area of the wall surface of the second side wall 222 facing the electrode assembly 10 except the third avoiding groove 2221.

[0176] The circular arc surface 2281 can refer to the side surface of the first arc-shaped portion 224 facing the electrode assembly 10, i.e., the inner side surface of the first arc-shaped portion 224, and the shape of the inner side surface of the first arc-shaped portion 224 can be a circular arc column.

[0177] By adopting the technical scheme of this embodiment, the inner wall surface of the first side wall 221 and the inner wall surface of the second side wall 222 can be smoothly connected through the circular arc surface 2281, which is conducive to reducing stress concentration and improving the structural strength of the shell 20.

[0178] In some other embodiments of the present application, referring to FIGS. 8-13, the groove wall surface of the avoiding groove 228 further comprises a first connecting surface 2282, the first connecting surface 2282 is arranged on the first side wall 221, the first connecting surface 2282 is connected between the circular arc surface 2281 and the inner wall surface of the first side wall 221, and the first connecting surface 2282 is inclined or perpendicular to the inner wall surface of the first side wall 221.

[0179] The first connecting surface 2282 can refer to the surface between the inner wall surface of the first side wall 221 and the circular arc surface 2281, and the first connecting surface 2282 is located on the first side wall 221.

[0180] The first connecting surface 2282 can be arranged to be inclined to the inner wall surface of the first side wall 221, i.e., an included angle is formed between the first connecting surface 2282 and the inner wall surface of the first side wall 221, and the included angle is an acute angle or an obtuse angle; the first connecting surface 2282 forms at least part of the groove wall surface of the second avoiding groove 2211.

[0181] The first connecting surface 2282 can be arranged to be perpendicular to the inner wall surface of the first side wall 221, i.e., the first connecting surface 2282 and the inner wall surface of the first side wall 221 are perpendicular to each other, which is simple in structure and convenient to manufacture and process.

[0182] In a possible embodiment, referring to FIG. 13, the groove wall surface of the avoiding groove 228 further comprises a first connecting surface 2282, the first connecting surface 2282 is arranged on the first side wall 221, the first connecting surface 2282 is connected between the circular arc surface 2281 and the inner wall surface of the first side wall 221, the first connecting surface 2282 is inclined to the inner wall surface of the first side wall 221, and a chamfer structure can be formed, which can reduce stress concentration and improve the structural strength of the shell 20.

[0183] For example, referring to FIG. 13, opposite sides of the first connecting surface 2282 are directly connected to edges of the arc surface 2281 and edges of the inner wall surface of the first side wall 221, which is simple in structure and convenient to manufacture.

[0184] In another possible implementation manner, referring to FIGS. 11 and 12, the groove wall surface of the avoiding groove 228 further includes a first connecting surface 2282, which is arranged on the first side wall 221 and connected between the arc surface 2281 and the inner wall surface of the first side wall 221. The first connecting surface 2282 is perpendicular to the inner wall surface of the first side wall 221, which is simple in structure and convenient to manufacture.

[0185] By adopting the technical scheme in this embodiment, the structure of the avoiding groove 228 can be flexibly set to meet different requirements.

[0186] In some other embodiments of the present application, referring to FIGS. 6, 11 and 12, the groove wall surface of the avoiding groove 228 further includes a first plane 2283, which is arranged on the first side wall 221 and connected between the first connecting surface 2282 and the arc surface 2281. The first plane 2283 is parallel to the inner wall surface of the first side wall 221.

[0187] The first plane 2283 can refer to a plane connected between the arc surface 2281 and the first connecting surface 2282, which is parallel or close to parallel to the inner wall surface of the first side wall 221.

[0188] For example, referring to FIG. 6, the first plane 2283 is located on the first side wall 221, and the first plane 2283 and the first connecting surface 2282 jointly form the groove wall surface of the second avoiding groove 2211. The first plane 2283 can be the groove bottom surface of the second avoiding groove 2211.

[0189] By adopting the technical scheme in this embodiment, the first plane 2283 is arranged, so that there is a transition region in the form of a plane between the arc surface 2281 and the first connecting surface 2282, which facilitates the molding of the shell 20. In addition, the structure is regular and convenient to manufacture.

[0190] In some other embodiments of the present application, referring to FIGS. 6, 11 and 12, the other side of the arc surface 2281 is tangent to the inner wall surface of the second side wall 222.

[0191] The inner wall surface of the second side wall 222 is distributed along the tangent direction of the arc surface 2281. That is, the second side wall 222 is not provided with the third avoiding groove 2221, and the arc surface 2281 is connected to the inner wall surface of the second side wall 222 in a smooth transition manner.

[0192] By adopting the technical scheme of the embodiment, the arc surface 2281 is tangent to the inner wall surface of the second side wall 222, and the arc surface 2281 and the inner wall surface of the second side wall 222 are connected in a smooth transition, which is beneficial to reduce stress concentration and improve the structural strength of the outer shell 20.

[0193] In some embodiments, referring to FIGS. 11 and 12, the first plane 2283 and the inner wall surface of the second side wall 222 are both tangent to the arc surface 2281, so that the arc surface 2281 can retain a complete quarter-arc shape, and the first arc-shaped portion 224 can retain a complete rounded structure, which is regular and simple in structure, convenient to manufacture, and beneficial to improve the structural strength of the outer shell 20. Of course, the first plane 2283 can also be tangent to the arc surface 2281.

[0194] In some embodiments, referring to FIG. 7, the second side wall 222 is provided with a third avoiding groove 2221 near the edge of the first arc-shaped portion 224, and the first avoiding groove 2241, the second avoiding groove 2211 and the third avoiding groove 2221 are connected and jointly form an avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10; the groove wall surface of the avoiding groove 228 further comprises a second connecting surface 2284, the second connecting surface 2284 is arranged on the second side wall 222, and the second connecting surface 2284 is connected between the arc surface 2281 and the second side wall 222, and the second connecting surface 2284 is inclined or perpendicular to the inner wall surface of the second side wall 222.

[0195] The second connecting surface 2284 can refer to a surface between the inner wall surface of the second side wall 222 and the arc surface 2281, and the second connecting surface 2284 is arranged on the second side wall 222.

[0196] The second connecting surface 2284 can be arranged to be inclined to the inner wall surface of the second side wall 222, that is, an included angle is formed between the second connecting surface 2284 and the inner wall surface of the second side wall 222, and the included angle is an acute angle or an obtuse angle; the second connecting surface 2284 forms at least part of the groove wall surface of the third avoiding groove 2221.

[0197] The second connecting surface 2284 can be arranged to be perpendicular to the inner wall surface of the second side wall 222, that is, the second connecting surface 2284 and the inner wall surface of the second side wall 222 are perpendicular to each other, which is simple in structure and convenient to manufacture.

[0198] In a possible implementation, referring to FIG. 7, the third avoiding groove 2221 is arranged on the edge of the first arc-shaped portion 224 of the second side wall 222, the first avoiding groove 2241, the second avoiding groove 2211 and the third avoiding groove 2221 are connected and jointly surround the avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10; the groove wall surface of the avoiding groove 228 further comprises a second connecting surface 2284, the second connecting surface 2284 is arranged on the second side wall 222, the second connecting surface 2284 is connected between the arc surface 2281 and the second side wall 222, and the second connecting surface 2284 is inclined relative to the inner wall surface of the second side wall 222, so as to form a chamfer structure, thereby reducing stress concentration and improving the structural strength of the shell 20.

[0199] In another possible implementation, the third avoiding groove 2221 is arranged on the edge of the first arc-shaped portion 224 of the second side wall 222, the first avoiding groove 2241, the second avoiding groove 2211 and the third avoiding groove 2221 are connected and jointly surround the avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10; the groove wall surface of the avoiding groove 228 further comprises a second connecting surface 2284, the second connecting surface 2284 is arranged on the second side wall 222, the second connecting surface 2284 is connected between the arc surface 2281 and the second side wall 222, and the second connecting surface 2284 is perpendicular relative to the inner wall surface of the second side wall 222, so as to have a simple structure and facilitate processing and manufacturing.

[0200] By adopting the technical scheme of the embodiment, the structure form of the avoiding groove 228 can be flexibly set to meet different requirements.

[0201] In some other embodiments of the present application, referring to FIGS. 7, 11 and 12, the groove wall surface of the avoiding groove 228 further comprises a second plane 2285, the second plane 2285 is arranged on the second side wall 222, the second plane 2285 is connected between the second connecting surface 2284 and the arc surface 2281, and the second plane 2285 is parallel to the inner wall surface of the second side wall 222.

[0202] The second plane 2285 can refer to a plane connected between the arc surface 2281 and the second connecting surface 2284, which is parallel or close to parallel to the inner wall surface of the second side wall 222.

[0203] For example, referring to FIG. 7, the second plane 2285 is located on the second side wall 222, and the second plane 2285 and the second connecting surface 2284 jointly form the groove wall surface of the third avoiding groove 2221; the second plane 2285 can be the groove bottom surface of the third avoiding groove 2221.

[0204] By adopting the technical scheme of the embodiment, the second plane 2285 is arranged, so that there is a planar transition area between the circular arc surface 2281 and the second connecting surface 2284, which facilitates the forming of the shell 20; in addition, the structure is regular and convenient to process.

[0205] In some embodiments, referring to FIG. 7, the first plane 2283 and the second plane 2285 are both tangent to the circular arc surface 2281, so that the circular arc surface 2281 can retain a complete quarter circular arc shape, so that the first arc-shaped part 224 can retain a complete rounded structure, which is regular in structure, simple and convenient to process. Of course, in other embodiments, the first plane 2283 can also not be tangent to the circular arc surface 2281, and the second plane 2285 can also not be tangent to the circular arc surface 2281.

[0206] In some embodiments, referring to FIG. 6 and FIG. 7, the radius of the circular arc surface 2281 is R1, and the size of the avoidance groove 228 in the direction perpendicular to the inner wall surface of the second side wall 222 is W, where 1≤W / R1≤3.

[0207] The direction perpendicular to the inner wall surface of the second side wall 222 can refer to the Z direction in FIG. 6.

[0208] 1≤W / R1≤3, it can be understood that W / R1≥1, so that the first side wall 221 is provided with the second avoidance groove 2211, which can reduce the thickness of the first side wall 221 near the first arc-shaped part 224, facilitating the forming of the shell 20; W / R1≤3, the size of the second avoidance groove 2211 is not too large, and the thinning area of the first side wall 221 is not too large, so that the first side wall 221 has appropriate structural strength to protect the electrode assembly 10.

[0209] By adopting the technical scheme of the embodiment, the size of the second avoidance groove 2211 is reasonably designed, and the structural strength of the shell 20 and the forming of the shell 20 can be considered at the same time.

[0210] In some embodiments, referring to FIG. 6 and FIG. 7, 1.5≤W / R1≤2.5.

[0211] By adopting the technical scheme of the embodiment, the design of 1.5≤W / R1≤2.5 makes the size of the second avoidance groove 2211 more reasonable, and the structural strength of the shell 20 and the forming of the shell 20 can be better considered.

[0212] In some embodiments, the value of W / R1 can be 1, 3 or any number between 1 and 3. For example, the value of W / R1 can be but is not limited to 1, 1.2, 1.4, 1.5, 1.7, 1.9, 2.1, 2.3, 2.5, 2.7, 2.9, 3.

[0213] In some other embodiments of the present application, referring to FIG. 14, the groove wall surface of the avoiding groove 228 comprises a third plane 2286, a fourth plane 2287 and a third connecting surface 2288 connected in sequence, the third plane 2286 is coplanar with the inner wall surface of the second side wall 222, the third plane 2286 is perpendicular to the fourth plane 2287, and the third connecting surface 2288 is connected between the fourth plane 2287 and the inner wall surface of the first side wall 221.

[0214] The third plane 2286 can refer to a surface coplanar with the inner wall surface of the second side wall 222, the fourth plane 2287 is perpendicular to the third plane 2286, and the third connecting surface 2288 is connected to the inner wall surface of the first side wall 221; for example, a part of the third plane 2286 and the fourth plane 2287 forms the groove wall surface of the first avoiding groove 2241, another part of the fourth plane 2287 and the third connecting surface 2288 form the groove wall surface of the second avoiding groove 2211, and the third connecting surface 2288 can be inclined or perpendicular to the inner wall surface of the first side wall 221.

[0215] By adopting the technical scheme of this embodiment, the third plane 2286 and the fourth plane 2287 form a right angle structure, which is simple in structure and convenient to process and manufacture.

[0216] In some other embodiments of the present application, referring to FIGS. 6 and 7, the groove depth of the first avoiding groove 2241 is h1, and the wall thickness of the first side wall 221 is H, wherein 0.02≤h1 / H≤2 / 3.

[0217] 0.02≤h1 / H≤2 / 3, it can be understood that h1 / H≥0.02 makes the first avoiding groove 2241 have a certain depth, so that there is a certain space to better avoid the edge 10a of the electrode assembly 10; h1 / H≤2 / 3 makes the groove depth of the first avoiding groove 2241 not too large, so that the shell 20 has better structural strength at the first arc-shaped part 224.

[0218] By adopting the technical scheme of this embodiment, the groove depth of the first avoiding groove 2241 is reasonably designed, and the edge 10a of the electrode assembly 10 and the structural strength of the shell 20 can be considered at the same time.

[0219] In some other embodiments of the present application, referring to FIGS. 6 and 7, 0.1≤h1 / H≤0.5.

[0220] By adopting the technical scheme of this embodiment, the design of 0.1≤h1 / H≤0.5 makes the size design of the first avoiding groove 2241 more reasonable, and the edge 10a of the electrode assembly 10 and the structural strength of the shell 20 can be better considered.

[0221] In some embodiments, the value of h1 / H can be 0.02, 2 / 3, or any number between 0.02 and 2 / 3. For example, but not limited to, the value of h1 / H can be 0.02, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 2 / 3.

[0222] In some embodiments, the value of h1 / H can be 0.02, 2 / 3, or any number between 0.02 and 2 / 3. For example, but not limited to, the value of h1 / H can be 0.02, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 2 / 3.

[0223] 0.1mm≤h1≤0.5mm, it can be understood that h1≥0.1mm, so that the first relief groove 2241 has a certain depth, thereby having a certain space to better avoid the edge 10a of the electrode assembly 10; h1≤0.5mm, so that the groove depth of the first relief groove 2241 is not too large, thereby making the shell 20 have better structural strength at the first arc-shaped portion 224.

[0224] By adopting the technical scheme of this embodiment, the groove depth of the first relief groove 2241 is reasonably designed, and the edge 10a of the electrode assembly 10 and the structural strength of the shell 20 can be considered at the same time.

[0225] In some embodiments, the value of h1 / H can be 0.02, 2 / 3, or any number between 0.02 and 2 / 3. For example, but not limited to, the value of h1 / H can be 0.02, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 2 / 3.

[0226] By adopting the technical scheme of this embodiment, the design of 0.15mm≤h1≤0.35mm makes the size design of the first relief groove 2241 more reasonable, and the edge 10a of the electrode assembly 10 and the structural strength of the shell 20 can be better considered.

[0227] In some embodiments, the value of h1 / H can be 0.02, 2 / 3, or any number between 0.02 and 2 / 3. For example, but not limited to, the value of h1 / H can be 0.02, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 2 / 3.

[0228] In some other embodiments of the present application, referring to Figs. 3-6, the shell 20 comprises a shell body 22 and two end covers 21, the shell body 22 is provided with openings at two ends oppositely distributed along a first direction, the electrode assembly 10 is located in the shell body 22, and the two end covers 21 are respectively covered on the two openings; the two side walls of the shell body 22 oppositely distributed along a second direction are first side walls 221, the two side walls of the shell body 22 oppositely distributed along a third direction are second side walls 222, and a first arc-shaped part 224 is connected between the first side wall 221 and the adjacent second side wall 222, the first direction, the second direction and the third direction are perpendicular to each other.

[0229] The first direction is perpendicular to the second direction, the second direction is perpendicular to the third direction, and the third direction is perpendicular to the first direction. The first direction can be referred to as the X direction in Figs. 3-7, the second direction can be referred to as the Y direction in Figs. 3-7, and the third direction can be referred to as the Z direction in Figs. 3-7. The shell body 22 is provided with openings at two ends oppositely arranged in the first direction, and the two end covers 21 are respectively covered on the two openings, thereby realizing the packaging of the shell 20. The two side walls of the shell body 22 oppositely arranged in the second direction can be referred to as first side walls 221, and the two side walls of the shell body 22 oppositely arranged in the third direction are referred to as second side walls 222. Opposite edges of one of the first side walls 221 are respectively connected with two of the second side walls 222 through the first arc-shaped parts 224, and opposite edges of the other of the first side walls 221 are respectively connected with two of the second side walls 222 through the first arc-shaped parts 224, thereby forming a space for accommodating the electrode assembly 10.

[0230] By adopting the technical scheme of this embodiment, the edges 10a of the electrode assembly 10 extending along the first direction are correspondingly provided with the first avoiding grooves 2241 for avoiding, and the electrode assembly 10 has good avoiding effect. The shell 20 adopts the structural form of the shell body 22 and the two end covers 21, and has simple structure, and the assembly and sealing of the battery monomer 100 are simple.

[0231] In some other embodiments of the present application, referring to Fig. 3, the electrode assembly 10 comprises a plurality of pole pieces 11, and the plurality of pole pieces 11 are arranged in layers along the third direction.

[0232] The electrode assembly 10 has a laminated structure, and the plurality of pole pieces 11 in the electrode assembly 10 are arranged in layers along the third direction.

[0233] By adopting the technical scheme of this embodiment, the plurality of pole pieces 11 are arranged in layers along the third direction, so that the electrode assembly 10 has four edges 10a extending along the second direction, and the first avoiding grooves 2241 of the four first arc-shaped parts 224 connected between the first side wall 221 and the second side wall 222 can be oppositely arranged with the four edges 10a, thereby providing avoiding space, reducing the risk of interference between the electrode assembly 10 and the shell 20, and being conducive to improving the volume energy density and the charge-discharge performance of the battery monomer 100.

[0234] In some other embodiments of the application, referring to Figs. 8, 23 and 24, the shell 20 comprises a housing 22 and an end cover 21, the electrode assembly 10 is located in the housing 22; the housing 22 is provided with an opening at one of the two ends distributed along the first direction, and the end cover 21 covers the opening; the side wall of the housing 22 opposite to the end cover 21 is the first side wall 221, the two side walls of the housing 22 distributed along the second direction are the second side walls 222, and the two side walls of the housing 22 distributed along the third direction are the third side walls 223; the first arc-shaped part 224 is connected between the first side wall 221 and each of the two second side walls 222, respectively, and the first direction, the second direction and the third direction are perpendicular to each other.

[0235] The first direction can refer to the X direction in Figs. 8-24, the second direction can refer to the Y direction in Figs. 8-24, and the third direction can refer to the Z direction in Figs. 8-24. The housing 22 is provided with an opening, which is located at one of the two ends of the housing 22 distributed along the first direction, and the end cover 21 covers the opening, thereby realizing the packaging of the shell 20; the two side walls of the housing 22 distributed along the second direction can be called the second side walls 222, the two side walls of the housing 22 distributed along the third direction are called the third side walls 223, one side of the first side wall 221 is connected with the two second side walls 222, respectively, and the other side of the first side wall 221 is connected with the two third side walls 223, respectively, and the space for accommodating the electrode assembly 10 is formed. Among them, the first arc-shaped part 224 is connected between one of the second side walls 222 and the first side wall 221, and the other second side wall 222 can directly intersect with the first side wall 221 or be connected with the first side wall 221 through an arc-shaped part; or, the first arc-shaped part 224 is connected between the two second side walls 222 and the first side wall 221.

[0236] By adopting the technical scheme of this embodiment, the edge 10a of the electrode assembly 10 extending along the third direction is correspondingly provided with the first avoiding groove 2241 for avoiding, and the avoiding effect of the electrode assembly 10 is good; the shell 20 adopts the structural form of the housing 22 and one end cover 21, the structure is simple, and the assembly and sealing of the battery monomer 100 are simple.

[0237] In some other embodiments of the application, referring to Figs. 8, 23 and 24, the electrode assembly 10 is in a winding structure, and the winding axis of the electrode assembly 10 is parallel to the first direction; or, the electrode assembly 10 is in a winding structure, and the winding axis of the electrode assembly 10 is parallel to the second direction; or, the electrode assembly 10 comprises a plurality of pole pieces 11, and the plurality of pole pieces 11 are stacked along the first direction.

[0238] The electrode assembly 10 is in a wound structure. It can be understood that the electrode tab 11 is wound to form the electrode assembly 10. For example, the electrode assembly 10 can be in a wound flat structure. The electrode assembly 10 in the wound flat structure can be prepared by winding the electrode tab 11 into a cylinder and then flattening the cylinder. The electrode assembly 10 can also be prepared in other ways. Of course, the electrode assembly 10 can be in a wound cylindrical structure. The winding axis of the electrode assembly 10 can be seen as a straight line g in FIGS. 15, 17 and 23. The electrode assembly 10 wound into a flat shape can easily interfere with the housing 22 along the long straight line 10c of the electrode assembly 10.

[0239] In a possible implementation, as shown in FIG. 8, the electrode assembly 10 is in a wound structure, and the winding axis of the electrode assembly 10 is parallel to the first direction. After the electrode assembly 10 is loaded into the housing 22, the long straight line 10c of the electrode assembly 10 facing away from the opening of the housing 22 can easily interfere with the housing 22. However, in this implementation, the first avoiding slot 2241 of the first arc-shaped part 224 is located on the side facing away from the opening of the housing 22 and is arranged opposite to the long straight line 10c of the electrode assembly 10, thereby avoiding the long straight line 10c and reducing the risk of interference between the electrode assembly 10 and the housing 22, which is conducive to improving the volumetric energy density of the battery monomer 100 and the charge-discharge performance of the battery monomer 100. The number of the first arc-shaped part 224 can be one, thereby avoiding the long straight line 10c on one side. The number of the first arc-shaped part 224 can be two, thereby avoiding the long straight line 10c on both sides.

[0240] In another possible implementation, as shown in FIG. 24, the electrode assembly 10 is in a wound structure, and the winding axis of the electrode assembly 10 is parallel to the second direction. After the electrode assembly 10 is loaded into the housing 22, the long straight line 10c of the electrode assembly 10 facing away from the opening of the housing 22 can easily interfere with the housing 22. However, in this implementation, the first avoiding slot 2241 of the first arc-shaped part 224 is located on the side facing away from the opening of the housing 22 and is arranged opposite to the long straight line 10c of the electrode assembly 10, thereby avoiding the long straight line 10c and being conducive to improving the volumetric energy density of the battery monomer 100 and the charge-discharge performance of the battery monomer 100.

[0241] For example, referring to FIG. 24, after the electrode assembly 10 is loaded into the shell 22, the long straight line 10c on the lower side of the electrode assembly 10 is most likely to interfere with the shell 22 under the action of gravity of the electrode assembly 10 itself. Therefore, only the first arc-shaped portion 224 between the second side wall 222 on the lower side and the lower side of the first side wall 221 can be connected, and the first avoiding groove 2241 of the first arc-shaped portion 224 can avoid the long straight line 10c on the lower side. The upper side of the second side wall 222 can directly intersect the upper side of the first side wall 221, or can be connected through an arc-shaped portion to reduce stress concentration. Alternatively, the first arc-shaped portion 224 can be connected between the second side wall 222 on the upper and lower sides and the upper and lower sides of the first side wall 221, and the first avoiding groove 2241 of the two first arc-shaped portions 224 can avoid the long straight line 10c on the upper and lower sides of the electrode assembly 10, so that the avoiding effect is better. The middle part of the second side wall 222 on the upper side can be recessed to form a space for accommodating the tab 12 at both ends of the second side wall 222. At this time, the recessed part of the second side wall 222 is likely to interfere with the long straight line 10c on the upper side. Therefore, the first arc-shaped portion 224 between the second side wall 222 on the upper side and the upper side of the first side wall 221 can be connected, and the avoiding groove 224 on the first arc-shaped portion 224 can pass through the part where the first arc-shaped portion 224 is connected with the recessed part, or only occupy the part of the area where the first arc-shaped portion 224 is connected with the recessed part.

[0242] In another possible implementation, referring to FIG. 23, the electrode assembly 10 includes a plurality of tabs 11, and the plurality of tabs 11 are arranged in a stack along the first direction. The electrode assembly 10 has a stacked structure, and the electrode assembly 10 loaded into the shell 22 has a plurality of tabs 11 arranged in a stack along the first direction. The edge 10a of the electrode assembly 10 extending along the third direction and away from the opening of the shell 22 is likely to interfere with the shell 22. However, in this embodiment, the first avoiding groove 2241 of the first arc-shaped portion 224 is located on the side away from the opening of the shell 22 and can be arranged opposite to the edge 10a, thereby avoiding the edge 10a, and facilitating to improve the volume energy density of the battery monomer 100 and the charge-discharge performance of the battery monomer 100.

[0243] By adopting the technical scheme of this embodiment, the shell 20 can meet the avoiding requirements of electrode assemblies 10 of various structural forms, and has a wide range of applications.

[0244] In some other embodiments of the present application, referring to FIGS. 8, 18 and 19, the electrode assembly 10 has a winding structure, the winding axis of the electrode assembly 10 is parallel to the first direction, the size of the electrode assembly 10 in the second direction is L1, and the distance between the first avoiding groove 2241 and the adjacent third side wall 223 is L2, wherein 1 / 15≤L2 / L1≤0.5.

[0245] The spacing L2 between the first avoiding groove 2241 and the adjacent third side wall 223 can refer to the spacing between the inner wall surface of the third side wall 223 and the first avoiding groove 2241.

[0246] For example, referring to FIGS. 8, 18 and 19, in the case that the arc line 10b is a semicircular arc or similar to a semicircular arc, the width L1 of the electrode assembly 10 is equal to the diameter of the arc line 10b, and the spacing between the vertex of the arc line 10b and the long straight line 10c in the length direction of the electrode assembly 10 is equal to or greater than half of the width of the electrode assembly 10.

[0247] 1 / 15≤L2 / L1≤0.5, it can be understood that L2 / L1≤0.5 makes the length of the first avoiding groove 2241 greater than or equal to the length of the long straight edge of the electrode assembly 10, the length of the first avoiding groove 2241 greater than or equal to the length of the edge 10a of the electrode assembly 10, so that the first avoiding groove 2241 can avoid the end point of the edge 10a of the electrode assembly 10, and thus the first avoiding groove 2241 can avoid the entire edge 10a of the electrode assembly 10; L2 / L1≥1 / 15 makes a certain spacing exist between the first avoiding groove 2241 and the third side wall 223, and the first avoiding groove 2241 is not too long, which is beneficial to improve the structural strength of the first arc-shaped part 224 and the shell 22.

[0248] For example, referring to FIG. 19, L2 / L1≥1 / 15 makes the first avoiding groove 2241 not extend to the fourth arc-shaped part 227, and the shell 22 has better structural strength.

[0249] By adopting the technical scheme of this embodiment, the length of the first avoiding groove 2241 is reasonably designed, and the structural strength of the shell 22 and the edge 10a of the electrode assembly 10 can be considered at the same time.

[0250] In some other embodiments of the present application, referring to FIGS. 8, 18 and 19, 0.1≤L3 / L1≤0.4.

[0251] By adopting the technical scheme of this embodiment, the design of 0.1≤L3 / L1≤0.4 makes the length of the first avoiding groove 2241 more reasonably designed, and the structural strength of the shell 22 and the edge 10a of the electrode assembly 10 can be considered better.

[0252] In some embodiments, the value of L2 / L1 can be 1 / 15, 0.5 or any value between 1 / 15 and 0.5, for example, but not limited to, 1 / 15, 0.07, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5.

[0253] In some embodiments of the present application, referring to FIGS. 8, 18 and 19, the electrode assembly 10 is in a rolled structure, the rolling axis of the electrode assembly 10 is parallel to the first direction, and the distance between the first relief groove 2241 and the adjacent third side wall 223 is L2, where 3mm≤L2≤8mm.

[0254] 3mm≤L2≤8mm. It can be understood that L2≥3mm, so that there is a certain distance between the first relief groove 2241 and the third side wall 223, and the first relief groove 2241 is not too long, which is beneficial to improve the structural strength of the shell 22; L2≤8mm, so that the first relief groove 2241 can avoid the end point of the edge 10a of the electrode assembly 10, and the first relief groove 2241 can avoid the entire edge 10a of the electrode assembly 10.

[0255] For example, referring to FIG. 19, in some cases, the radius R4 of the inner wall surface of the third arc-shaped portion 226 is less than or equal to 3mm, and the design of L2≥3mm makes the first relief groove 2241 not extend to the fourth arc-shaped portion 227, and the shell 22 has better structural strength.

[0256] By adopting the technical scheme of this embodiment, the length of the first relief groove 2241 is reasonably designed, and the structural strength of the shell 22 and the edge 10a of the electrode assembly 10 can be considered at the same time.

[0257] In some embodiments of the present application, referring to FIGS. 8, 18 and 19, 4mm≤L2≤6mm.

[0258] By adopting the technical scheme of this embodiment, the design of 4mm≤L2≤6mm makes the length of the first relief groove 2241 more reasonably designed, and the structural strength of the shell 22 and the edge 10a of the electrode assembly 10 can be better considered.

[0259] In some embodiments, the value of L2 can be 3mm, 8mm or any value between 3mm and 8mm. For example, the value of L2 can be, but is not limited to, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm.

[0260] In some embodiments of the present application, referring to FIGS. 8, 15 and 17, the electrode assembly 10 is in a rolled structure, the rolling axis of the electrode assembly 10 is parallel to the first direction, and the second arc-shaped portion 225 is connected between the opposite two side portions of the first side wall 221 and the two third side walls 223 respectively, and the fourth relief groove 2251 is arranged on the inner side of the second arc-shaped portion 225, and the fourth relief groove 2251 is used to avoid the vertex of the end portion of the electrode assembly 10 adjacent to the second arc-shaped portion 225.

[0261] The second arc-shaped portion 225 can refer to a structure for smoothly connecting the first side wall 221 and the third side wall 223, for example, referring to FIG. 22, the second arc-shaped portion 225 is a rounded corner structure, and the second arc-shaped portion 225 can also be referred to as an R corner. Referring to FIG. 8, the fourth avoidance groove 2251 for avoiding the vertex of the end portion of the electrode assembly 10 adjacent to the second arc-shaped portion 225 can refer to the vertex of the arc-shaped line 10b of the electrode assembly 10, the second arc-shaped portion 225 is arranged opposite to the vertex of the arc-shaped line 10b of the electrode assembly 10, and the vertex of the arc-shaped line 10b is also easy to interfere with the second arc-shaped portion 225, and the inner side of the second arc-shaped portion 225 is provided with the fourth avoidance groove 2251, so that the fourth avoidance groove 2251 can avoid the vertex of the arc-shaped line 10b.

[0262] For example, referring to FIGS. 21 and 22, the boundary line between the first side wall 221 and the second arc-shaped portion 225 can refer to the dashed line R in the figure, and the boundary line between the third side wall 223 and the second arc-shaped portion 225 can refer to the dashed line Q in the figure.

[0263] By adopting the technical scheme of this embodiment, the fourth avoidance groove 2251 of the second arc-shaped portion 225 can avoid the vertex of the end portion of the electrode assembly 10, so that the fourth avoidance groove 2251 can also provide avoidance space for the vertex of the end portion of the electrode assembly 10 during the expansion of the electrode assembly 10, and can also reduce the interference amount between the electrode assembly 10 and the second arc-shaped portion 225, reduce the risk of decarburization and lithium precipitation caused by the interference between the electrode assembly 10 and the second arc-shaped portion 225, and is beneficial to improve the charge-discharge performance of the battery monomer 100.

[0264] In some other embodiments of the present application, referring to FIGS. 8, 18 and 20, the electrode assembly 10 is a winding structure, the winding axis of the electrode assembly 10 is parallel to the first direction, which is L1, and the spacing between the fourth avoidance groove 2251 and the adjacent second side wall 222 is L3, wherein 1 / 15≤L3 / L1≤0.5.

[0265] The spacing L3 between the fourth avoidance groove 2251 and the adjacent second side wall 222 can refer to the spacing between the inner wall surface of the second side wall 222 and the fourth avoidance groove 2251.

[0266] For example, referring to FIGS. 8, 18 and 20, in the width direction of the electrode assembly 10, the spacing between the vertex of the arc-shaped line 10b and the second side wall 222 is equal to or greater than half the width of the electrode assembly 10.

[0267] 1 / 15≤L3 / L1≤0.5, it can be understood that L3 / L1≤0.5 makes the distance between the fourth avoiding groove 2251 and the second side wall 222 less than or equal to half of the width of the electrode assembly 10, the fourth avoiding groove 2251 can avoid the vertex of the arc line 10b, the fourth avoiding groove 2251 can better avoid the end of the electrode assembly 10 in the length direction, in addition, in the case that a plurality of electrode assemblies 10 are arranged in the width direction of the electrode assembly 10, the fourth avoiding groove 2251 can also avoid the vertex of the arc line 10b of all the electrode assemblies 10, and the avoiding effect is better; L3 / L1≥1 / 15 makes the fourth avoiding groove 2251 and the second side wall 222 exist a certain distance, and the fourth avoiding groove 2251 is not too long, which is beneficial to improve the structural strength of the shell 22.

[0268] For example, referring to FIG. 19, L3 / L1≥1 / 15 makes the fourth avoiding groove 2251 not extend to the fourth arc-shaped part 227, and the shell 22 has better structural strength.

[0269] By adopting the technical scheme of the embodiment, the length of the fourth avoiding groove 2251 is reasonably designed, and the structural strength of the shell 22 and the avoiding of the electrode assembly 10 can be considered at the same time.

[0270] In some embodiments of the present application, referring to FIGS. 8, 18 and 20, 0.1≤L3 / L1≤0.4.

[0271] By adopting the technical scheme of the embodiment, the design of 0.1≤L3 / L1≤0.4 makes the length of the fourth avoiding groove 2251 more reasonably designed, and the structural strength of the shell 22 and the avoiding of the electrode assembly 10 can be better considered.

[0272] In some embodiments, the value of L3 / L1 can be 1 / 15, 0.5 or any value between 1 / 15 and 0.5, for example, but not limited to, 1 / 15, 0.07, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 or 0.5.

[0273] In some embodiments of the present application, referring to FIGS. 8, 18 and 20, the distance between the fourth avoiding groove 2251 and the adjacent second side wall 222 is L3, wherein 3mm≤L3≤8mm.

[0274] 3mm≤L3≤8mm, it can be understood that L3≥3mm, so that the fourth avoiding groove 2251 has a certain distance with the second side wall 222, the fourth avoiding groove 2251 is not too long, and the structural strength of the shell 22 is improved; L3≤8mm, so that the fourth avoiding groove 2251 can avoid the vertex of the arc line 10b of the electrode assembly 10, and the fourth avoiding groove 2251 can better avoid the end of the electrode assembly 10 in the length direction.

[0275] For example, referring to FIG. 19, in some cases, the radius R4 of the inner wall surface of the third arc-shaped part 226 is less than or equal to 3mm; the design of L3≥3mm makes the fourth avoiding groove 2251 not extend to the fourth arc-shaped part 227, and the shell 22 has better structural strength.

[0276] By adopting the technical scheme of this embodiment, the length of the fourth avoiding groove 2251 is reasonably designed, and the structural strength of the shell 22 and the avoiding of the electrode assembly 10 can be considered at the same time.

[0277] In another embodiment of the present application, referring to FIGS. 8, 18 and 20, 4mm≤L3≤6mm.

[0278] By adopting the technical scheme of this embodiment, the design of 4mm≤L3≤6mm makes the length of the fourth avoiding groove 2251 more reasonably designed, and the structural strength of the shell 22 and the avoiding of the electrode assembly 10 can be better considered.

[0279] In some embodiments, the value of L3 can be 3mm, 8mm or any value between 3mm and 8mm, for example, the value of L3 can be but is not limited to 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm.

[0280] In another embodiment of the present application, referring to FIGS. 21 and 22, the groove depth of the fourth avoiding groove 2251 is h2, wherein 0.1mm≤h2≤0.3mm.

[0281] 0.1mm≤h2≤0.3mm, it can be understood that h2≥0.1mm, so that the fourth avoiding groove 2251 has a certain depth, thereby having a certain space to better avoid the side edge of the electrode assembly 10; h2≤0.3mm, so that the groove depth of the fourth avoiding groove 2251 is not too large, thereby making the shell 20 have better structural strength at the second arc-shaped part 225.

[0282] By adopting the technical scheme of this embodiment, the groove depth of the fourth avoiding groove 2251 is reasonably designed, and the structural strength of the shell 20 and the edge 10a of the electrode assembly 10 can be considered at the same time.

[0283] In some embodiments, the value of h2 can be 0.1 mm, 0.3 mm, or any number between 0.1 mm and 0.3 mm. For example, the value of h2 can be, but is not limited to, 0.1 mm, 0.12 mm, 0.15 mm, 0.17 mm, 0.2 mm, 0.25 mm, or 0.3 mm.

[0284] In some embodiments, the shell 22 is generally made by punching or bending a plate, and the thickness of the plate is equal to or close to the thickness of the side wall of the shell 22 and the thickness of the arc-shaped portion. The thickness H of the first side wall 221 can be in the range of 0.2 mm to 1.5 mm, and the thickness of the plate is also equal to or close to the thickness of the first side wall 221. The above design of the thickness allows the plate to have a certain thickness and be successfully formed. In addition, the thickness is not too large, so that the volume of the shell 22 is not too large and the mass is not too heavy, which can avoid problems such as difficulty in forming. For example, the value of the thickness H of the first side wall 221 can be, but is not limited to, 0.2 mm, 0.5 mm, 1 mm, or 1.5 mm.

[0285] In some embodiments of the present application, referring to FIGS. 15 and 17, a third arc-shaped portion 226 is connected between the adjacent third side wall 223 and the second side wall 222. The third arc-shaped portion 226 is connected with a fourth arc-shaped portion 227, one end of the fourth arc-shaped portion 227 is connected with the first arc-shaped portion 224, and the other end of the fourth arc-shaped portion 227 is connected with the second arc-shaped portion 225. The inner side of the fourth arc-shaped portion 227 is provided with a communication groove 2271, which communicates the first avoiding groove 2241 and the fourth avoiding groove 2251.

[0286] The third arc-shaped portion 226 can refer to a structure for smoothly connecting the second side wall 222 and the third side wall 223. For example, referring to FIG. 15, the third arc-shaped portion 226 is a rounded corner structure, and the third arc-shaped portion 226 can also be referred to as an R corner.

[0287] The fourth arc-shaped portion 227 is connected between the third arc-shaped portion 226 and the first side wall 221. The fourth arc-shaped portion 227 can refer to a structure for smoothly connecting the first side wall 221 and the third arc-shaped portion 226. For example, referring to FIG. 16, the fourth arc-shaped portion 227 is a rounded corner structure, and the fourth arc-shaped portion 227 can also be referred to as a corner of the shell 22.

[0288] The inner side of the fourth arc-shaped portion 227 is provided with a communication groove 2271, which can communicate the first avoiding groove 2241 and the fourth avoiding groove 2251, so that the bottom of the shell 22 has a whole-circle groove structure.

[0289] By adopting the technical scheme of the embodiment, the third arc-shaped portion 226 can smoothly connect the second side wall 222 and the third side wall 223, and the fourth arc-shaped portion 227 can smoothly connect the third arc-shaped portion 226 and the first side wall 221, so that stress concentration can be reduced, and the forming of the shell 22 is facilitated; the fourth avoiding groove 2251 is arranged to make the shell 22 have a whole-circle groove structure, so that the thickness of the fourth arc-shaped portion 227 can be reduced, the forming of the shell 22 is facilitated, and the processing of the groove structure is simpler.

[0290] In some embodiments, referring to FIGS. 12 and 22, the groove wall surface of the third avoiding groove 2221 can also include a circular arc surface with a radius of R2, and the groove wall surface of the communicating groove 2271 can also include a circular arc surface with a radius of R3, so that the inner wall surface of the first side wall 221 and the inner wall surface of the third side wall 223, and the inner wall surface of the first side wall 221 and the inner wall surface of the third arc-shaped portion 226 can be smoothly connected, stress concentration can be reduced, and the structural strength of the shell 22 can be improved; in addition, the value of R1, the value of R2 and the value of R3 can be the same or different.

[0291] In some embodiments, referring to FIG. 12, the groove depth of the first avoiding groove 2241 is h1, and the groove depth of the communicating groove 2271 is h3, where 0.2≤h3 / h1≤1.

[0292] 0.2≤h3 / h1≤1. It can be understood that h3 / h1≥0.2, so that the fourth arc-shaped portion 227 has a communicating groove 2271 with a certain depth, the communicating groove 2271 can reduce stress concentration of the fourth arc-shaped portion 227, improve the structural strength, reduce the tensile cracking of the shell 22, and facilitate the forming of the shell 22; h3 / h1≤1, so that the groove depth of the communicating groove 2271 is less than or equal to the groove depth of the first avoiding groove 2241, the thickness of the fourth arc-shaped portion 227 is larger, and thus the shell 22 has good structural strength at the corner, which is beneficial to improve the structural strength of the shell 22.

[0293] By adopting the technical scheme of the embodiment, the groove depth of the communicating groove 2271 is designed reasonably, so that the shell 22 is convenient to form and has good structural strength at the corner, which is beneficial to improve the structural strength of the shell 22.

[0294] In some embodiments, referring to FIG. 12, 0.3≤h3 / h1≤0.7.

[0295] By adopting the technical scheme of the embodiment, the groove depth of the communicating groove 2271 is designed more reasonably, so that the shell 22 is more convenient to form and has better structural strength at the corner, which is beneficial to improve the structural strength of the shell 22.

[0296] In some embodiments, the value of h3 / h1 can be 0.2, 1, or any number between 0.2 and 1. For example, the value of h3 can be, but is not limited to, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.

[0297] In some embodiments of the present application, referring to FIG. 12, the depth of the communication groove 2271 is h3, where 0.1mm≤h3≤0.3mm.

[0298] 0.1mm≤h3≤0.3mm. It can be understood that h3≥0.1mm so that the fourth arc-shaped portion 227 has a certain depth of the communication groove 2271, which can reduce the stress concentration of the fourth arc-shaped portion 227, improve the structural strength, and also reduce the tensile cracking of the shell 22. h3≤0.3mm so that the depth of the communication groove 2271 is not too large, thereby making the shell 20 have better structural strength at the fourth arc-shaped portion 227.

[0299] By adopting the technical solution of this embodiment, the depth of the communication groove 2271 is reasonably designed, which can simultaneously take into account the molding and structural strength of the shell 20.

[0300] In some embodiments, the value of h3 can be 0.1mm, 0.3mm, or any number between 0.1mm and 0.3mm. For example, the value of h3 can be, but is not limited to, 0.1mm, 0.12mm, 0.15mm, 0.17mm, 0.2mm, 0.25mm, 0.3mm.

[0301] The battery cell 100 of the present application is described below in combination with some specific embodiments.

[0302] Embodiment One

[0303] In this embodiment, referring to FIGS. 3-6, the battery cell 100 includes an electrode assembly 10 and a shell 20, the electrode assembly 10 is located in the shell 20, and the shell 20 includes a first side wall 221 and a second side wall 222; a first arc-shaped portion 224 is connected between the first side wall 221 and the second side wall 222, the first arc-shaped portion 224 is arranged opposite to the edge 10a of the electrode assembly 10, and at least a section of the first arc-shaped portion 224 is provided with a first avoiding groove 2241 for avoiding the corresponding edge 10a of the electrode assembly 10.

[0304] In the embodiment, the shell 20 comprises a casing 22 and two end covers 21, the casing 22 is provided with openings at two ends oppositely distributed along a first direction, the electrode assembly 10 is located in the casing 22, and the two end covers 21 are respectively covered on the two openings; the two side walls of the casing 22 oppositely distributed along a second direction are first side walls 221, the two side walls of the casing 22 oppositely distributed along a third direction are second side walls 222, and the first side wall 221 and the adjacent second side wall 222 are connected with a first arc-shaped part 224, the first direction, the second direction and the third direction are perpendicular to each other.

[0305] In the embodiment, the electrode assembly 10 comprises a plurality of pole pieces 11, and the plurality of pole pieces 11 are arranged in a stack along a third direction.

[0306] In the embodiment, the first side wall 221 is provided with a second avoiding groove 2211 at an edge portion close to the first arc-shaped part 224, the first avoiding groove 2241 and the second avoiding groove 2211 are communicated and jointly form the avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10.

[0307] In the embodiment, the groove wall surface of the avoiding groove 228 comprises a circular arc surface 2281, the circular arc surface 2281 is arranged at the first arc-shaped part 224, and the circular arc surface 2281 is connected between the inner wall surface of the first side wall 221 and the inner wall surface of the second side wall 222.

[0308] In the embodiment, the groove wall surface of the avoiding groove 228 further comprises a first connecting surface 2282, the first connecting surface 2282 is arranged at the first side wall 221, the first connecting surface 2282 is connected between the circular arc surface 2281 and the inner wall surface of the first side wall 221, and the first connecting surface 2282 is inclined relative to the inner wall surface of the first side wall 221.

[0309] In the embodiment, the groove wall surface of the avoiding groove 228 further comprises a first plane 2283, the first plane 2283 is arranged at the first side wall 221; the first plane 2283 is connected between the first connecting surface 2282 and the circular arc surface 2281, and the first plane 2283 is parallel to the inner wall surface of the first side wall 221.

[0310] In the embodiment, the other side of the circular arc surface 2281 is tangent to the inner wall surface of the second side wall 222.

[0311] Embodiment two

[0312] The difference between the embodiment and the embodiment one is that, as shown in FIG. 7, the first side wall 221 is provided with a second avoiding groove 2211 at an edge portion close to the first arc-shaped part 224, the second side wall 222 is provided with a third avoiding groove 2221 at an edge portion close to the first arc-shaped part 224, and the first avoiding groove 2241, the second avoiding groove 2211 and the third avoiding groove 2221 are communicated and jointly form the avoiding groove 228 for avoiding the corresponding edge 10a of the electrode assembly 10.

[0313] In the embodiment, the groove wall surface of the avoiding groove 228 further comprises a second connecting surface 2284, the second connecting surface 2284 is arranged on the second side wall 222, the second connecting surface 2284 is connected between the circular arc surface 2281 and the second side wall 222, and the second connecting surface 2284 is inclined relative to the inner wall surface of the second side wall 222.

[0314] In the embodiment, the groove wall surface of the avoiding groove 228 further comprises a second flat surface 2285, the second flat surface 2285 is arranged on the second side wall 222, the second flat surface 2285 is connected between the second connecting surface 2284 and the circular arc surface 2281, and the second flat surface 2285 is parallel to the inner wall surface of the second side wall 222.

[0315] Embodiment three

[0316] The embodiment is different from the embodiment one in that, referring to FIGS. 8-11, the shell 20 comprises a shell body 22 and an end cover 21, and the electrode assembly 10 is located in the shell body 22; one of the two end faces of the shell body 22 distributed along a first direction is provided with an opening, and the end cover 21 covers the opening; a side wall of the shell body 22 opposite to the end cover 21 is a first side wall 221, two side walls of the shell body 22 distributed along a second direction are second side walls 222, and two side walls of the shell body 22 distributed along a third direction are third side walls 223; the first side wall 221 is connected with two second side walls 222 through a first arc-shaped part 224 respectively, and the first direction, the second direction and the third direction are perpendicular to each other.

[0317] In the embodiment, the electrode assembly 10 is in a winding structure, and the winding axis of the electrode assembly 10 is parallel to the first direction.

[0318] In the embodiment, the groove wall surface of the avoiding groove 228 further comprises a first connecting surface 2282, the first connecting surface 2282 is arranged on the first side wall 221, the first connecting surface 2282 is connected between the circular arc surface 2281 and the inner wall surface of the first side wall 221, and the first connecting surface 2282 is perpendicular relative to the inner wall surface of the first side wall 221.

[0319] Embodiment four

[0320] The embodiment is different from the embodiment three in that, referring to FIG. 13, the groove wall surface of the avoiding groove 228 further comprises a first connecting surface 2282, the first connecting surface 2282 is arranged on the first side wall 221, one side of the first connecting surface 2282 is connected with one side of the circular arc surface 2281, the other side of the first connecting surface 2282 is connected with the inner wall surface of the first side wall 221, and the first connecting surface 2282 is inclined relative to the inner wall surface of the first side wall 221.

[0321] Embodiment five

[0322] The difference between this embodiment and embodiment three is that, as shown in FIG. 14, the groove wall surface of the avoiding groove 228 comprises a third plane 2286, a fourth plane 2287 and a third connecting surface 2288 connected in sequence, the third plane 2286 is coplanar with the inner wall surface of the second side wall 222, the third plane 2286 is perpendicular to the fourth plane 2287, and the third connecting surface 2288 is connected between the fourth plane 2287 and the inner wall surface of the first side wall 221.

[0323] Embodiment six

[0324] The difference between this embodiment and embodiment three is that, as shown in FIGS. 12, 15, 16, 18 and 19, the first side wall 221 is connected with two third side walls 223 through two second arc-shaped parts 225 respectively.

[0325] In this embodiment, the third arc-shaped part 226 is connected between the adjacent third side wall 223 and the second side wall 222, the fourth arc-shaped part 227 is connected between the third arc-shaped part 226 and the first side wall 221, one end of the fourth arc-shaped part 227 is connected with the first arc-shaped part 224, and the other end of the fourth arc-shaped part 227 is connected with the second arc-shaped part 225.

[0326] Embodiment seven

[0327] The difference between this embodiment and embodiment six is that, as shown in FIGS. 15, 17, 18 and 20-22, the inner side of the second arc-shaped part 225 is provided with a fourth avoiding groove 2251, and the fourth avoiding groove 2251 is used for avoiding the vertex of the end of the electrode assembly 10 adjacent to the second arc-shaped part 225.

[0328] In this embodiment, the inner side of the fourth arc-shaped part 227 is provided with a communication groove 2271, and the communication groove 2271 communicates the first avoiding groove 2241 and the fourth avoiding groove 2251.

[0329] Embodiment eight

[0330] The difference between this embodiment and embodiment three is that, as shown in FIG. 23, the electrode assembly 10 comprises a plurality of pole pieces 11, and the plurality of pole pieces 11 are stacked along the first direction.

[0331] Embodiment nine

[0332] The difference between this embodiment and embodiment three is that, as shown in FIG. 24, the electrode assembly 10 is in a winding structure, and the winding axis of the electrode assembly 10 is parallel to the second direction.

[0333] In some other embodiments of the present application, a battery 1100 is provided, comprising the battery cell 100 as described in the above embodiments.

[0334] The battery 1100 of the embodiment of the present application adopts the battery monomer 100 described above, has large volume energy density and good use reliability, has long endurance time, and has good use reliability.

[0335] In some other embodiments of the present application, a power consuming device is provided, which includes the battery 1100 as described in the above embodiments.

[0336] The power consuming device of the embodiment of the present application adopts the battery 1100 described above, has large volume energy density and good use reliability, has long endurance time, and has better performance.

[0337] The above description of the various embodiments tends to emphasize the differences between the various embodiments, and the same or similar parts can be referred to each other, which will not be described herein for the sake of brevity.

[0338] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, wherein, The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

2. The battery cell of claim 1, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

3. The battery cell of claim 1, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

4. The battery cell of claim 1, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

5. The battery cell of claim 2 or 4, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

6. The battery cell of claim 5, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

7. The battery cell of claim 6, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

8. The battery cell of any one of claims 5-7, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

9. The battery cell of any one of claims 5-8, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

10. The battery cell of claim 9, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

11. The battery cell of any one of claims 5-10, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane.

12. The battery cell of claim 11, wherein: The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a first arc section, a first avoiding slot, a second avoiding slot, a third avoiding slot, a circular arc surface, a first connecting surface, a first plane, a second connecting surface and a second plane. The utility model relates to an electrode assembly, a shell, a 13. The battery cell of any one of claims 2-12, wherein: The wall surface of the avoiding groove comprises a third plane, a fourth plane and a third connecting surface connected in sequence, the third plane is coplanar with the inner wall surface of the second side wall, the third plane is perpendicular to the fourth plane, and the third connecting surface is connected between the fourth plane and the inner wall surface of the first side wall.

14. The battery cell of any one of claims 1-13, wherein: The groove depth of the first avoiding groove is h1, and the wall thickness of the first side wall is H, wherein 0.02≤h1 / H≤2 / 3.

15. The battery cell of claim 14, wherein: 0.1≤h1 / H≤0.

5.

16. The battery cell of claim 14 or 15, wherein: The groove depth of the first avoiding groove is h1, wherein 0.1mm≤h1≤0.5mm.

17. The battery cell of claim 16, wherein: 0.15mm≤h1≤0.35mm.

18. The battery cell of any one of claims 1-17, wherein: The shell comprises a shell body and two end covers, the shell body is provided with openings on two end surfaces oppositely distributed along a first direction, the electrode assembly is located in the shell body, and the two end covers are respectively covered on the two openings; the two side walls of the shell body oppositely distributed along a second direction are the first side walls, the two side walls of the shell body oppositely distributed along a third direction are the second side walls, and the first side wall and the adjacent second side wall are connected by the first arc-shaped part, and the first direction, the second direction and the third direction are perpendicular to each other.

19. The battery cell of claim 18, wherein: The electrode assembly comprises a plurality of pole pieces, and the plurality of pole pieces are stacked along the third direction.

20. The battery cell of any one of claims 1-19, wherein: The shell comprises a shell body and an end cover, and the electrode assembly is located in the shell body; one of the two end surfaces of the shell body oppositely distributed along a first direction is provided with an opening, and the end cover is covered on the opening; The side wall of the shell body oppositely arranged with the end cover is the first side wall, the two side walls of the shell body oppositely distributed along a second direction are the second side walls, and the two side walls of the shell body oppositely distributed along a third direction are the third side walls; the first side wall is connected with the two second side walls on the opposite sides by the first arc-shaped part, and the first direction, the second direction and the third direction are perpendicular to each other.

21. The battery cell of claim 20, wherein: The electrode assembly is in a winding structure, and the winding axis of the electrode assembly is parallel to the first direction; or the electrode assembly is in a winding structure, and the winding axis of the electrode assembly is parallel to the second direction; or the electrode assembly comprises a plurality of pole pieces, and the plurality of pole pieces are stacked along the first direction.

22. The battery cell of claim 20 or 21, wherein: The electrode assembly is in a winding structure, the winding axis of the electrode assembly is parallel to the first direction, the size of the electrode assembly in the second direction is L1, and the distance between the first avoiding groove and the adjacent third side wall is L2, wherein 1 / 15≤L2 / L1≤0.

5.

23. The battery cell of claim 22, wherein: 0.1≤L2 / L1≤0.

4.

24. The battery cell of any one of claims 20-23, wherein: The electrode assembly is in a winding structure, the winding axis of the electrode assembly is parallel to the first direction, and the distance between the first avoiding groove and the adjacent third side wall is L2, wherein 3mm≤L2≤8mm.

25. The battery cell of claim 24, wherein: 4mm≤L2≤6mm.

26. The battery cell of any one of claims 20-25, wherein: The electrode assembly is in a winding structure, an axis of winding of the electrode assembly is parallel to the first direction, and opposite edges of the first side wall are respectively connected with two third side walls through second arc-shaped portions.

27. The battery cell of claim 26, wherein: A dimension of the electrode assembly in the second direction is L1, and a distance between the fourth avoiding groove and the adjacent second side wall is L3, wherein 1 / 15≤L3 / L1≤0.

5.

28. The battery cell of claim 27, wherein: 0.1≤L3 / L1≤0.

4.

29. The battery cell of any one of claims 26-28, wherein: The distance between the fourth avoiding groove and the adjacent second side wall is L3, wherein 3mm≤L3≤8mm.

30. The battery cell of claim 28, wherein: 4mm≤L3≤6mm.

31. The battery cell of any one of claims 26-30, wherein: A groove depth of the fourth avoiding groove is h2, wherein 0.1mm≤h2≤0.3mm.

32. The battery cell of any one of claims 26-31, wherein: The third arc-shaped portion is connected with the first side wall through a fourth arc-shaped portion, one end of the fourth arc-shaped portion is connected with the first arc-shaped portion, the other end of the fourth arc-shaped portion is connected with the second arc-shaped portion, and an inner side of the fourth arc-shaped portion is provided with a communication groove, the communication groove communicates the first avoiding groove and the fourth avoiding groove.

33. The battery cell of claim 32, wherein: A groove depth of the first avoiding groove is h1, and a groove depth of the communication groove is h3, wherein 0.2≤h3 / h1≤1.

34. The battery cell of claim 33, wherein: 0.3≤h3 / h1≤0.

7.

35. The battery cell of any one of claims 32-34, wherein: The groove depth of the communication groove is h3, wherein 0.1mm≤h3≤0.3mm.

36. A battery, wherein: The battery cell of any one of claims 1-35.

37. An electrical device, comprising: The battery of claim 36.

Images