Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery which comprises a battery cell and a shell, and the battery cell comprises a positive plate, a diaphragm and a negative plate which are stacked in sequence; the diaphragm is provided with a first part, the first part is provided with an extension part protruding out of at least one side edge of the negative plate, and at least part of the end part of the extension part is provided with a notch. The battery cell is located in the shell, the shell comprises a body and a shell cover, one side of the body is open, and the shell cover covers the opening of the body. At the moment, a distance is formed between the extension part and one side, facing the battery cell, of the shell cover along the first direction, so that mutual interference between the diaphragm and the packaging edge of the shell is avoided, the battery cell can be conveniently packaged by the shell, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, in particular to a battery. Background Art

[0002] With people's growing demands, batteries are gradually developing towards fast charging, long life, high energy density and high safety.

[0003] Common batteries include a cell and a shell, which is used to encapsulate and protect the cell. The cell has a positive electrode sheet, a negative electrode sheet and a separator, the positive electrode sheet and the negative electrode sheet are located on opposite sides of the separator along the thickness direction of the separator, and the separator insulates the positive electrode sheet and the negative electrode sheet along its thickness direction, and also insulates the circumferential sides of the positive electrode sheet and the negative electrode sheet.

[0004] When the battery cell is encapsulated in the shell, the edge of the diaphragm away from the positive and negative electrodes is bent along the thickness direction of the diaphragm and close to the inner wall of the shell. The diaphragm is easily in contact with the encapsulation edge of the shell, which makes it inconvenient to encapsulate the battery cell with the shell and reduces production efficiency. Utility Model Content

[0005] The present application provides a battery, which is convenient for battery packaging and can improve production efficiency.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application provides a battery, comprising:

[0008] A battery cell, comprising a positive electrode sheet, a separator, and a negative electrode sheet stacked in sequence; the separator has a first portion, the first portion has an extension portion protruding from at least one side edge of the negative electrode sheet, and at least part of the end of the extension portion has a notch;

[0009] A shell, the battery cell is located in the shell, the shell comprises a body and a shell cover, one side of the body is open, and the shell cover is arranged to cover the opening of the body;

[0010] Along the first direction, there is a distance between the extension portion and the shell cover facing one side of the battery core.

[0011] As a possible implementation manner, along a second direction, a distance is formed between the extension portion and the inner wall of the shell, and the second direction intersects with the first direction.

[0012] As a possible implementation manner, the extension portion is bent relative to the shell cover along the first direction.

[0013] As a possible implementation manner, edges of the extension portions facing the shell wall of the shell are connected to each other.

[0014] As a possible implementation manner, at least part of the edge of the notch is a straight line; and / or,

[0015] The edge of the notch is at least partially curved.

[0016] As a possible implementation, the diaphragm includes a plurality of first parts connected end to end in sequence; the first part is located between the adjacent positive electrode sheet and the negative electrode sheet; the end of the extension portion close to the shell cover at least partially has the notch; or,

[0017] The diaphragm includes a plurality of first parts which are not connected to each other, and the first parts are located between the adjacent positive electrode sheets and the negative electrode sheets; and the end of the extension portion close to the shell cover at least partially has the notch.

[0018] As a possible implementation manner, there is a gap between the edge of the notch and the adjacent negative electrode sheet;

[0019] Along the first direction, the spacing on the side close to the shell cover is smaller than the spacing on the side of the shell wall close to the body and opposite to the shell cover; and / or;

[0020] The distance between the edge of the notch and the adjacent negative electrode sheet increases sequentially along the first direction.

[0021] As a possible implementation manner, an edge of the notch is recessed relative to the end of the shell toward a side away from the end of the shell.

[0022] As a possible implementation, the diaphragm includes a first diaphragm close to the shell cover, and a second diaphragm close to the shell wall opposite to the body and the shell cover;

[0023] Along a direction intersecting the first direction, the extending portion of the first separator is located on a side of the extending portion of the second separator close to the negative electrode sheet.

[0024] As a possible implementation manner, the battery cell further includes a positive electrode ear and a negative electrode ear, the positive electrode ear is electrically connected to the positive electrode sheet, the negative electrode ear is electrically connected to the negative electrode sheet, and the positive electrode ear and the negative electrode ear are located at the same end of the battery cell;

[0025] Along the length direction of the negative electrode lug, the end portion of the extension portion on the side away from the positive electrode lug or the negative electrode lug has the notch.

[0026] As a possible implementation manner, a distance between an edge of the extension portion and a side of the shell cover facing the battery core is 0.1 mm-2 mm.

[0027] As a possible implementation manner, along the direction intersecting the first direction, there is a spacing between the edges of the adjacent extension portions;

[0028] The spacing is less than or equal to 0.2 mm.

[0029] As a possible implementation manner, when the edge of the notch is a straight line, along the first direction intersecting, the distance between the end of the extension portion away from the adjacent negative electrode sheet and the edge of the negative electrode sheet is 0-2 mm; and / or,

[0030] When the edge of the notch is an arc, along the direction intersecting the first direction, the distance between the end of the extension portion facing away from the adjacent negative electrode sheet and the edge of the negative electrode sheet is 0-6 mm.

[0031] In the battery provided by the present application, during the process of encapsulating the battery cell through the shell, the extension portion of the diaphragm is bent along the first direction, and the edge of the extension portion is toward the shell cover of the shell along the first direction. Since the top corner of the diaphragm has a notch, the degree of bending of the extension portion close to the shell cover of the shell and the distance between the extension portion and the shell cover of the shell can be reduced, and a certain distance is formed between the edge of the extension portion and the inner side of the shell cover of the shell. In this way, the diaphragm will not contact the shell cover of the shell, that is, there is no mutual interference between the diaphragm and the shell cover, which facilitates the encapsulation of the battery cell by the shell and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a schematic diagram of a part of the structure of a battery in the prior art;

[0034] Figure 2 A schematic diagram of a battery provided in an embodiment of the present application;

[0035] Figure 3 Schematic diagram of the structure of the battery cell provided in the embodiment of the present application Figure 1 ;

[0036] Figure 4 Schematic diagram of the structure of the battery cell provided in the embodiment of the present application Figure 2 ;

[0037] Figure 5 for Figure 3 AA section view Figure 1 ;

[0038] Figure 6 for Figure 3 AA section view Figure 2 ;

[0039] Figure 7 for Figure 4 BB section view in;

[0040] Figure 8 This is a schematic diagram of the internal structure of a battery provided in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 100-battery;

[0043] 110-battery cell;

[0044] 111- positive electrode;

[0045] 112-diaphragm;

[0046] 112a- first diaphragm;

[0047] 112b - second diaphragm;

[0048] 1121- extension;

[0049] 1122-Gap;

[0050] 113- negative electrode sheet;

[0051] 114- positive electrode ear;

[0052] 115-negative electrode ear;

[0053] 120-housing;

[0054] 121-Ontology;

[0055] 122- Shell cover. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0057] With people's growing demands, batteries are gradually developing towards fast charging, long life, high energy density and high safety.

[0058] like Figure 1 As shown, a common battery 100 includes a battery cell 110 and a shell 120, and the shell 120 is used to encapsulate the battery cell 110 and protect the battery cell 110. The battery cell 110 has a positive electrode sheet 111, a negative electrode sheet 113 and a separator 112, and the positive electrode sheet 111 and the negative electrode sheet 113 are located on opposite sides of the separator 112 along the thickness direction of the separator 112. The separator 112 insulates the positive electrode sheet 111 and the negative electrode sheet 113 along its own thickness direction (Z direction), and also insulates the circumferential sides of the positive electrode sheet 111 and the negative electrode sheet 113.

[0059] When the shell 120 encapsulates the battery cell 110, the edge of the diaphragm 112 that is away from the positive electrode sheet 111 and the negative electrode sheet 113 is bent along the thickness direction of the diaphragm 112 against the inner wall of the shell 120, and the diaphragm 112 is easily in contact with the encapsulation edge of the shell 120, which makes it inconvenient for the shell 120 to encapsulate the battery cell 110, and the production efficiency is reduced. When the shell 120 is a soft-pack shell, the edge of the diaphragm 112 is likely to interfere with the heat seal during the heat sealing process of the soft-pack shell; or, if the shell 120 is a steel shell, the edge of the diaphragm 112 is also likely to interfere with the welding edge of the steel shell, and it is easy to form a welding explosion point. All of these will lead to a reduction in the production efficiency of the battery 100.

[0060] In order to overcome the defects in the prior art, an embodiment of the present application provides a battery, the battery includes a battery and a shell, the battery cell includes a positive electrode sheet, a diaphragm and a negative electrode sheet stacked in sequence, the diaphragm has a first part, the first part has an extension protruding from at least one side edge of the negative electrode sheet, and the end of the extension has a notch. The shell is used to encapsulate the battery cell. At this time, after the shell encapsulates the battery cell, there is a gap between the edge of the extension and the shell cover of the shell, so as to avoid mutual interference between the encapsulation edges of the diaphragm and the shell, facilitate the encapsulation operation of the shell on the battery cell, and improve production efficiency.

[0061] The content of the utility model will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the content of the utility model more clearly and in detail.

[0062] Figure 2 A schematic diagram of a battery provided in an embodiment of the present application. Figure 3 Schematic diagram of the structure of the battery cell provided in the embodiment of the present application Figure 1 . Figure 4 Schematic diagram of the structure of the battery cell provided in the embodiment of the present application Figure 2 . Figure 5 for Figure 3 AA section view Figure 1 . Figure 6 for Figure 3 AA section view Figure 2 . Figure 7 for Figure 4 BB section view in. Figure 8 This is a schematic diagram of the internal structure of a battery provided in an embodiment of the present application. Figure 2-Figure 8 As shown, this embodiment provides a battery 100 including a battery cell 110 and a housing 120 .

[0063] The battery cell 110 includes a positive electrode sheet 111, a separator 112, and a negative electrode sheet 113 stacked in sequence; the separator 112 has a first portion, the first portion has an extension portion 1121 protruding from at least one side edge of the negative electrode sheet 113, and the end of the extension portion 1121 has a notch 1122 at least partially.

[0064] The battery cell 110 is located in the housing 120 . The housing 120 includes a body 121 and a housing cover 122 . The body 121 has an opening on one side, and the housing cover 122 covers the opening of the body 121 .

[0065] Along the first direction (Z direction), a gap is formed between the extension portion 1121 and a side of the case cover 122 facing the battery cell 110 .

[0066] In the battery 100 provided in this embodiment, during the process of encapsulating the battery cell 110 through the shell 120, the extension portion 1121 of the diaphragm 112 is bent along the first direction (Z direction), and the edge of the extension portion 1121 is directed toward the shell cover 122 of the shell 120 along the first direction (Z direction). Since the end of the diaphragm 112 has a notch 1122, the degree of bending of the extension portion 1121 close to the shell cover 122 of the shell 120 and the distance between the extension portion 1121 and the shell cover 122 of the shell 120 can be reduced, and a certain distance is formed between the edge of the extension portion 1121 and the inner side of the shell cover 122 of the shell 120. In this way, the diaphragm 112 will not contact the shell cover 122 of the shell 120, that is, there is no mutual interference between the diaphragm 112 and the shell cover 122, which facilitates the encapsulation of the battery cell 110 by the shell 120 and improves production efficiency.

[0067] It should be noted that the first direction in this embodiment is the thickness direction of the battery cell 110 , such as the Z direction marked in the figure.

[0068] Exemplarily, the battery cell 110 includes a stacked positive electrode sheet 111, a separator 112, and a negative electrode sheet 113. In some embodiments, along the first direction (Z direction), the positive electrode sheet 111 and the positive electrode sheet 111 are arranged on opposite sides of the separator 112, so that the positive electrode sheet 111 and the negative electrode sheet 113 are insulated and isolated by the separator 112 to ensure the safety and service life of the battery 100. It is understood that the structural size of the separator 112 should be slightly larger than the negative electrode sheet 113 to cover the positive electrode sheet 111 and the negative electrode sheet 113 along the thickness direction (Z direction) of the separator 112.

[0069] The diaphragm 112 in this embodiment has a first portion, and along the first direction (Z direction), one side of the first portion is opposite to the positive electrode sheet 111, and the other side of the first portion is opposite to the negative electrode sheet 113, so that the positive electrode sheet 111 and the negative electrode sheet 113 can be insulated and isolated by the first portion of the diaphragm 112. Further, the first portion has an extension portion 1121 protruding from at least one side edge of the negative electrode sheet 113.

[0070] It can be understood that the structural dimensions of the negative electrode sheet 113 are slightly larger than those of the positive electrode sheet 111, so that the extension 1121 can extend along the X direction, and the length of the diaphragm 112 along the X direction is greater than the length of the negative electrode sheet 113. At the same time, the extension 1121 extends along the Y direction, and the width of the diaphragm 112 along the Y direction is greater than the width of the negative electrode sheet 113. In this way, when the battery cell 110 is located in the shell 120, the extension 1121 is bent as the inner wall of the shell 120 squeezes the battery cell 110, and the bending of the extension 1121 is along the first direction (Z direction), that is, the thickness direction of the battery cell 110. In this way, the extension 1121 can insulate and isolate the sides of the positive electrode sheet 111 and the negative electrode sheet 113. However, due to the existence of the margin of the extension 1121, the edge of the extension 1121 is easy to interfere with the shell cover 122 of the shell 120, resulting in reduced packaging effect and packaging efficiency of the shell 120.

[0071] It should be noted that the length and width of the negative electrode sheet 113 in this embodiment are greater than the length and width of the positive electrode sheet 111, that is, the area of ​​the negative electrode sheet 113 is greater than the area of ​​the positive electrode sheet 111. Such a battery 100 can better balance the flow of charge and improve the charge and discharge efficiency of the battery 100. Moreover, more active materials in the electrolyte can be concentrated on the negative electrode, thereby improving the total capacity of the battery 100.

[0072] Further, the end of the extension 1121 in this embodiment facing the inner wall of the shell 120 has a notch 1122 at least partially. Due to the design of the notch 1122, the length dimension of the extension 1121 along the X direction and the width dimension along the Y direction are relatively reduced. Therefore, the bending degree and bending distance of the extension 1121 in the shell 120 are relatively reduced, so that along the first direction (Z direction), the edge of the extension 1121 after bending and the inner side of the shell cover 122 of the shell 120 form a certain distance. That is to say, the diaphragm 112 and the shell cover 122 of the shell 120 will not interfere with each other, and accordingly, the diaphragm 112 will not interfere with the packaging connection of the shell 120, which facilitates the packaging of the battery cell 110 by the shell 120, thereby improving the packaging effect and packaging efficiency of the shell 120 and the production efficiency of the battery 100.

[0073] It can be understood that the battery cell 110 is encapsulated in the shell 120, and the length and width of the diaphragm 112 are larger than the negative electrode sheet 113. In order to prevent the diaphragm 112 from contacting the inner wall of the shell 120, and the interference formed by the diaphragm 112 and the shell cover 122, therefore, in some embodiments, along the second direction (Y direction), the extension portion 1121 and the inner wall of the shell 120 have a spacing, and the second direction (Y direction) and the first direction (X direction) intersect.

[0074] It should be noted that the second direction in this embodiment is the width direction of the battery cell 110 , such as the Y direction marked in the figure. In essence, the second direction (Y direction) is perpendicular to the first direction (X direction).

[0075] Of course, in some embodiments, the extension portion 1121 is bent along the first direction (Z direction) relative to the shell cover 122. It is not difficult to understand that when the structure of some batteries 100 is relatively small, the size of the shell 120 is correspondingly small, and after the shell 120 encapsulates the battery cell 110, the extension portion 1121 is bent along the first direction (Z direction) toward the shell cover 122 side of the shell 120.

[0076] Furthermore, in order to further facilitate the packaging of the battery cell 110, in some embodiments, the edges of the extensions 1121 facing the shell wall of the shell 120 are connected to each other. Exemplarily, the extensions 1121 can be bonded by an adhesive.

[0077] It is understandable that the shape of the notch 1122 is various. As one possible implementation, the edge of the notch 1122 is at least partially straight; and / or, the edge of the notch 1122 is at least partially curved.

[0078] In the actual production process, the top corner of the end of the extension part 1121 is cut so that the top corner of the end of the extension part 1121 has a notch 1122. The edge of the notch 1122 is a straight line, and the cutting is simple, which can not only ensure the structure of the notch 1122, but also improve the production efficiency of the battery cell 110, and further improve the packaging efficiency of the battery 100.

[0079] It should be noted that the edge of the notch 1122 in this embodiment may be partially straight, that is, the edge of the notch 1122 may also be a combination of straight lines or curves, and this embodiment does not make any specific limitation on this.

[0080] Alternatively, in some embodiments, the edge of the notch 1122 is at least partially curved. Similarly, the cutting of the top corner of the extension 1121 along the arc is easy to operate, suitable for mass production of the battery cell 110, improving the production efficiency of the battery cell 110, and correspondingly, also helps to improve the packaging efficiency and production efficiency of the battery 100. In this way, when the shell 120 encapsulates the battery cell 110, since there is a gap between the edge of the extension 1121 and the side of the shell cover 122 facing the battery cell 110, when the shell cover 122 and the body 121 are welded, no welding explosion point will be formed, thereby improving the packaging efficiency and production efficiency of the battery 100.

[0081] In this embodiment, when the edge of the notch 1122 is a straight line, along the first direction (Z direction), the distance between the end of the extension portion 1121 away from the adjacent negative electrode sheet 113 and the edge of the negative electrode sheet 113 is ( Figure 3 W1) is 0-2 mm; and / or; when the edge of the notch 1122 is an arc, along the first direction (Z direction), the distance between the end of the extension 1121 away from the adjacent negative electrode sheet 113 and the edge of the negative electrode sheet 113 ( Figure 4 The W2) marked in the figure is 0-6mm.

[0082] There are many ways to form the battery cell 110, and the structure of the separator 112 will also change accordingly. There are multiple positive electrode sheets 111 and multiple negative electrode sheets 113, and the positive electrode sheets 111 and the negative electrode sheets 113 are sequentially spaced and alternated along the first direction (Z direction).

[0083] The diaphragm 112 includes a plurality of first portions connected end to end in sequence, and the first portion is located between adjacent positive electrode sheets 111 and negative electrode sheets 113 ; the end of the partial extension portion 1121 close to the shell cover 122 at least partially has a notch 1122 .

[0084] Alternatively, the separator 112 includes a plurality of first portions that are not connected to each other, and the first portions are located between the adjacent positive electrode sheets 111 and negative electrode sheets 113 ; and the end of the partial extension portion 1121 close to the shell cover 122 at least partially has a notch 1122 .

[0085] It can be understood that for some power batteries 100 or batteries 100 that have special requirements on the performance of the battery 100, the battery 100 has multiple positive plates 111 and negative plates 113, and the multiple positive plates 111 and the multiple negative plates 113 are spaced and alternated in sequence along the first direction (Z direction). It can be understood that there is a gap between adjacent positive plates 111 and negative plates 113, and a diaphragm 112 is arranged in the gap to achieve insulation isolation of adjacent positive plates 111 and negative plates 113 to ensure the safety and service life of the battery 100.

[0086] Specifically, the diaphragm 112 can be bent along a Z-shape. The diaphragm 112 is bent to form a plurality of first portions connected to each other. It can be understood that the plurality of first portions are sequentially opposite to each other along a first direction (Z direction), and the first portions are located between adjacent positive electrode sheets 111 and negative electrode sheets 113. In this way, a complete diaphragm 112 can insulate and isolate the positive electrode sheet 111 and the negative electrode sheet 113 by bending.

[0087] In this embodiment, each positive electrode sheet 111 and each negative electrode sheet 113 are located on opposite sides of the first portion along the thickness direction (Z direction) of the separator 112, the length of the extension portion 1121 corresponding to each first portion along the X direction is greater than the length of the negative electrode sheet 113, and the width of the extension portion 1121 corresponding to each first portion along the Y direction is greater than the width of the negative electrode sheet 113. In this way, after the battery cell 110 is formed, the battery cell 110 is packaged by the housing 120.

[0088] The diaphragm 112 in this embodiment forms a continuous multi-layer structure. It can be understood that along the first direction (Z direction), the number of layers and the overall thickness of the extension 1121 increase, and the insulation margin formed by the extension 1121 is bent in the housing 120, which is easy to abut against the shell cover 122 of the housing 120, forming packaging interference. In order to reduce the occurrence of such a situation, in this embodiment, some of the top corners of the ends of some of the extensions 1121 have a notch 1122 design.

[0089] Specifically, along the first direction (Z direction), a portion of the top corners of a portion of the shell cover 122 of the shell 120 in the plurality of extensions 1121 is provided with a notch 1122. In this way, the structural dimensions of the extension 1121 are relatively reduced. In this way, during the bending process of the extension 1121, the edge of the extension 1121 will no longer interfere with the shell cover 122 of the shell 120, which facilitates the encapsulation of the battery cell 110 by the shell 120, facilitates the molding of the battery 100, and improves the encapsulation efficiency and production efficiency of the battery 100. In addition, there is no interference between the extension 1121 and the shell cover 122 of the shell 120, and the encapsulation effect of the shell 120 on the battery cell 110 is better. It can be understood that the battery 100 has good sealing performance and can prevent leakage, so as to improve the safety of the battery 100.

[0090] In an optional embodiment, the diaphragm 112 includes a plurality of first parts that are independent of each other and not connected to each other, and the first parts of the plurality of diaphragms 112 are spaced and opposite to each other along the first direction (Z direction), and each diaphragm 112 is located between adjacent positive electrode sheets 111 and negative electrode sheets 113. It can be understood that the first part is opposite to the positive electrode sheet 111 and the negative electrode sheet 113 on opposite sides along the thickness direction (Z direction) of the diaphragm 112. The length of the extension 1121 corresponding to each first part along the X direction is greater than the length of the negative electrode sheet 113. The width of the extension 1121 corresponding to each first part along the Y direction is greater than the width of the negative electrode sheet 113. In this way, each diaphragm 112 can insulate and isolate the adjacent positive electrode sheets 111 and negative electrode sheets 113. After the battery cell 110 is formed, the battery cell 110 of this embodiment is encapsulated by the shell 120.

[0091] Along the first direction (Z direction), the number of layers and the overall thickness of the extension 1121 increase, and the insulation margin formed by the extension 1121 is bent in the housing 120, and it is easy to abut against the shell cover 122 of the housing 120, forming packaging interference. In order to avoid such a situation, in this embodiment, some of the top corners of the ends of some extensions 1121 have notches 1122. The notch 1122 in this embodiment has the same structure and function as the continuous first part of the above-mentioned diaphragm 112, and will not be repeated in this part.

[0092] On the basis of the above-mentioned embodiment, there is a spacing between the edge of the notch 1122 and the adjacent negative electrode sheet 113. Along the first direction (Z direction), the spacing close to the shell cover 122 is smaller than the spacing close to the shell wall side opposite to the body 121 and the shell cover 122; and / or, the spacing between the edge of the notch 1122 and the adjacent negative electrode sheet 113 increases successively along the first direction (Z direction). In this way, the end of the extension portion 1121 forms a structure similar to a step or a slope.

[0093] It is not difficult to understand that there is a spacing between the edge of the notch 1122 and the adjacent negative electrode sheet 113. That is to say, the extension 1121 protrudes from the edge of the negative electrode sheet 113. When the battery cell 110 is located in the shell 120, the extension 1121 is bent in the shell 120, which can achieve insulation isolation of the sides of the positive electrode sheet 111 and the negative electrode sheet 113. In this embodiment, along the first direction (Z direction), the spacing on the side of the shell wall close to the body 121 and the shell cover 122 is greater than the spacing on the side close to the shell cover 122. It is easy to understand that the extension 1121 forms a step-like structure at the notch 1122. In this way, when the extension 1121 is bent in the shell 120, the bending margin of the part of the extension 1121 close to the shell cover 122 is relatively small, and the extension 1121 will not contact the shell cover 122. Meanwhile, the bending margin of the extended portion 1121 of the shell wall that is close to the main body 121 and the shell cover 122 is relatively large, but a gap can still be formed between the extended portion 1121 and the shell cover 122 after bending.

[0094] Furthermore, the distance between the edge of the notch 1122 and the adjacent negative electrode sheet 113 increases in sequence along the first direction (Z direction). In this way, when the shell 120 encapsulates the battery cell 110, the extension portion 1121 close to the shell cover 122 of the shell 120 will not interfere with the shell cover 122 of the shell 120 after being bent in the shell 120.

[0095] The plurality of extensions 1121 are arranged along the Z direction, and along the Z direction, a portion of the extensions 1121 near the shell cover 122 has a notch 1122 at a portion of the top corner. The distance between the portion of the extension 1121 and the adjacent negative electrode sheet 113 at the edge of the notch 1122 increases successively along the Z direction. The extension 1121 forms a chamfered structure along the Z direction at the edge of the notch 1122.

[0096] It can be understood that when the shell 120 encapsulates the battery cell 110, the extension 1121 is bent along the Z direction near the shell cover 122. At this time, the bending margin of the extension 1121 close to the shell cover 122 is reduced, and there is a gap between the edge of the bent extension 1121 and the shell cover 122, that is, there is no interference between the edge of the extension 1121 and the shell cover 122 in this embodiment. Since the extension 1121 away from the shell cover 122 is far away from the shell cover 122, the edge after bending will not extend to the shell cover 122, and will not interfere with the shell cover 122, and will not form a welding explosion point. The packaging efficiency and production efficiency of such a battery 100 are improved.

[0097] In some other embodiments, the edge of the notch 1122 is recessed relative to the top corner of the housing 120 toward the side away from the top corner of the housing 120. A plurality of extensions 1121 are arranged along the Z direction, and a portion of the top corners of the extensions 1121 close to the shell cover 122 in the plurality of extensions 1121 has a notch 1122. The edge of this portion of the extension 1121 is recessed relative to the top corner of the housing 120 toward the side away from the top corner of the housing 120. A recessed area is formed at the top corner of the diaphragm 112. Along the Z direction, the distance between the extension 1121 at the edge of the recessed area and the adjacent negative electrode sheet 113 can be reduced first and then increased.

[0098] It should be noted that after packaging such a battery cell 110 , after the extension portion 1121 close to the shell cover 122 is bent, there is still a distance between the edge of the extension portion 1121 and the shell cover 122 .

[0099] Specifically, the diaphragm 112 includes a first diaphragm 112a close to the shell cover 122, and a second diaphragm 112b close to the shell wall opposite to the body 121 and the shell cover 122; along the first direction (Z direction) intersecting, the extension portion 1121 of the first diaphragm 112a is located on the side of the extension portion 1121 of the second diaphragm 112b close to the negative electrode sheet 113.

[0100] Combination Figure 6 and Figure 8 , the first diaphragm 112a is located on one side of the shell cover 122 close to the shell 120. Exemplarily, the first diaphragm 112a may be located at the top of the battery cell 110 along the first direction (Z direction), or may be located in the middle of the battery cell 110 and close to the shell cover 122 of the shell 120. The second diaphragm 112b is located on one side of the body 121 opposite to the shell cover 122. Exemplarily, the second diaphragm 112b is located on the bottom side of the battery cell 110 or on the bottom side of the middle of the battery cell 110 along the first direction (Z direction). In the specific implementation process, the first diaphragm 112a may be located on the 1-5 layers of the battery cell along the first direction (Z direction).

[0101] Thus, the recessed area formed by the notch of the diaphragm 112 is as shown in FIG. Figure 8 In this way, after the shell 120 encapsulates the battery cell 110, the extension 1121 is bent along the Z direction, and there is a certain distance between the edge of the extension 1121 and the shell cover 122 of the shell 120, which can ensure the safety, packaging efficiency and production efficiency of the battery 100.

[0102] In some embodiments, along the first direction (Z direction), there is a spacing ( Figure 5 The spacing is less than or equal to 0.2 mm.

[0103] In a specific implementation, the battery cell 110 further includes a positive electrode ear 114 and a negative electrode ear 115, the positive electrode ear 114 is electrically connected to the positive electrode sheet 111, the negative electrode ear 115 is electrically connected to the negative electrode sheet 113, and the positive electrode ear 114 and the negative electrode ear 115 are located at the same end of the battery cell 110. Along the length direction of the negative electrode ear 115, the end of the extension portion 1121 away from the positive electrode ear 114 or the negative electrode ear 115 has a notch 1122.

[0104] like Figure 3 and Figure 4 As shown, the positive ear 114 and the negative ear 115 are located at one end of the battery cell 110 along the X direction. Among them, the positive ear 114 is electrically connected to the positive electrode sheet 111. Exemplarily, the positive ear 114 can be welded on the positive electrode sheet 111 and electrically connected to the positive electrode sheet 111. Correspondingly, the negative ear 115 is electrically connected to the negative electrode sheet 113. Specifically, the negative electrode sheet 113 can be welded on the negative electrode sheet 113 and electrically connected to the negative electrode sheet 113. When the shell 120 encapsulates the battery cell 110, a portion of the positive ear 114 and the negative ear 115 are exposed to the outside of the shell 120, forming an electrical connection end, and is used to electrically connect to an external device.

[0105] When the shell 120 encapsulates the battery cell 110 , the connection between the positive electrode ear 114 and the positive electrode sheet 111 , and the connection between the negative electrode ear 115 and the negative electrode sheet 113 are spaced apart from the shell cover 122 of the shell 120 along the Z direction, so that the positive electrode ear 114 and the negative electrode ear 115 are avoided.

[0106] It can be understood that the extension 1121 of the diaphragm 112 has sufficient installation space at one end close to the positive electrode ear 114 and the negative electrode ear 115, and the extension 1121 will not interfere with the shell cover 122 of the shell 120 after being bent along the Z direction. However, along the length direction (X direction) of the negative electrode ear 115, the side of the extension 1121 away from the positive electrode ear 114 or the negative electrode ear 115 is easy to form packaging interference with the shell cover of the shell 120 in the package due to the small installation space.

[0107] Therefore, in this embodiment, the top corner of the extension portion 1121 on the side away from the positive electrode ear 114 or the negative electrode ear 115 along the length direction (X direction) of the negative electrode ear 115 has a notch 1122 to prevent interference between the extension portion 1121 at this position and the shell cover 122 of the shell 120, thereby improving the packaging efficiency and production efficiency of the battery 100.

[0108] Of course, in some embodiments, in order to facilitate the processing of the battery cell 110 , notches 1122 may be provided at the four corners of the diaphragm 112 to ensure the packaging efficiency and production efficiency of the battery 100 .

[0109] It should be noted that the distance between the edge of the extension portion 1121 and the side of the shell cover 122 facing the battery cell ( Figure 8 The W4) marked in the figure is 0.1 mm-2 mm. That is, after the battery cell 110 is packaged by the shell 120, the distance between the edge of the extension portion 1121 of the diaphragm 112 and the shell cover 122 is 0.1 mm-2 mm.

[0110] The battery 100 provided in this embodiment includes a battery cell 110 and a shell 120. The battery cell 110 includes a stacked positive electrode sheet 111, a separator 112, and a negative electrode sheet 113; the separator 112 has a first portion, the first portion has an extension portion 1121 protruding from at least one side edge of the negative electrode sheet 113, and the end of the extension portion 1121 at least partially has a notch 1122. The shell 120 is used to encapsulate the battery cell 110, and the shell 120 includes a body 121 and a shell cover 122, one side of the body 121 is open, and the shell cover 122 is covered on the opening of the body 121; along the first direction, a gap is formed between the extension portion 1121 and the shell cover 122 facing the side of the battery cell 110. Through such a structural arrangement, the production efficiency is improved.

[0111] In addition, this embodiment may also provide an electronic device, comprising an electronic component and the battery 100 in any of the aforementioned embodiments, wherein the electronic component and the battery 100 are electrically connected.

[0112] It should be noted that the electronic device in this embodiment may be a mobile phone, a laptop computer, an earphone, a tablet computer, etc., and is not limited to the above electronic devices.

[0113] The electronic device provided in this embodiment can improve production efficiency because it includes the battery 100 in the aforementioned embodiment.

[0114] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0115] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0116] It should be easily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0117] In addition, spatially relative terms, such as "below," "below," "below," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, 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 utility model.

Claims

1. A battery, characterized in that: include: The battery cell includes a positive electrode sheet, a separator, and a negative electrode sheet stacked in sequence; The separator has a first portion, the first portion has an extension portion protruding from at least one side edge of the negative electrode sheet, and at least part of the end of the extension portion has a notch; A shell, the battery cell is located in the shell, the shell comprises a body and a shell cover, one side of the body is open, and the shell cover is arranged to cover the opening of the body; Along the first direction, a gap is formed between the extension portion and a side of the shell cover facing the battery core.

2. The battery according to claim 1, characterized in that A gap is formed between the extension portion and the inner wall of the housing along a second direction, and the second direction intersects with the first direction.

3. The battery according to claim 1, characterized in that The extension portion is bent relative to the shell cover along the first direction.

4. The battery according to claim 1, characterized in that The edges of the extension portions facing the shell wall of the shell are connected to each other.

5. The battery according to any one of claims 1 to 4, characterized in that: The edge of the notch is at least partially straight; and / or, The edge of the notch is at least partially curved.

6. The battery according to any one of claims 1 to 4, characterized in that: The diaphragm comprises a plurality of the first parts connected end to end in sequence; the first part is located between the adjacent positive electrode sheet and the negative electrode sheet; the end of the extension portion close to the shell cover at least partially has the notch; or, The diaphragm includes a plurality of first parts which are not connected to each other, and the first parts are located between the adjacent positive electrode sheets and the negative electrode sheets; and the end of the extension portion close to the shell cover at least partially has the notch.

7. The battery according to any one of claims 1 to 4, characterized in that: There is a gap between the edge of the notch and the adjacent negative electrode sheet; Along the first direction, the spacing on the side close to the shell cover is smaller than the spacing on the side of the shell wall close to the body and opposite to the shell cover; and / or, The distance between the edge of the notch and the adjacent negative electrode sheet increases sequentially along the first direction.

8. The battery according to any one of claims 1 to 4, characterized in that: The edge of the notch is recessed relative to the end of the shell toward a side away from the end of the shell.

9. The battery according to claim 8, characterized in that The diaphragm includes a first diaphragm close to the shell cover, and a second diaphragm close to the shell wall of the body opposite to the shell cover; Along a direction intersecting the first direction, the extending portion of the first separator is located on a side of the extending portion of the second separator close to the negative electrode sheet.

10. The battery according to any one of claims 1 to 4, characterized in that: The battery cell further comprises a positive electrode ear and a negative electrode ear, the positive electrode ear is electrically connected to the positive electrode sheet, the negative electrode ear is electrically connected to the negative electrode sheet, and the positive electrode ear and the negative electrode ear are located at the same end of the battery cell; Along the length direction of the negative electrode lug, the end portion of the extension portion on the side away from the positive electrode lug or the negative electrode lug has the notch.

11. The battery according to any one of claims 1 to 4, characterized in that: The distance between the edge of the extension portion and the side of the shell cover facing the battery core is 0.1 mm-2 mm.

12. The battery according to any one of claims 1 to 4, characterized in that: There is a spacing between the edges of adjacent extension portions along the direction intersecting the first direction; The spacing is less than or equal to 0.2 mm.

13. The battery according to claim 5, characterized in that When the edge of the notch is a straight line, along the first direction intersecting, the distance between the end of the extension portion away from the adjacent negative electrode sheet and the edge of the negative electrode sheet is 0-2 mm; and / or, When the edge of the notch is an arc, along the direction intersecting the first direction, the distance between the end of the extension portion facing away from the adjacent negative electrode sheet and the edge of the negative electrode sheet is 0-6 mm.

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