CN115552700A

CN115552700A - Battery and electric equipment

Info

Publication number: CN115552700A
Application number: CN202180028922.1A
Authority: CN
Inventors: 李晓峰; 郭培培; 林森
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-12-30
Also published as: WO2023097463A1

Abstract

A battery includes an electrode assembly and a first conductive plate connected to the electrode assembly, and a case. The housing includes a first housing piece including a first face curved in a first direction and a second housing piece including a second face disposed spaced apart from the first face in a second direction. The second face is bent in the first direction and clamps the electrode assembly together with the first face. The case further includes a first portion having a projection that at least partially overlaps a projection of the electrode assembly along the third direction. The first housing piece is connected to the second housing piece. The first portion includes a first folded back portion, a second folded back portion, and a first end portion. The first folding part is connected to the joint of the first shell part and the second shell part, the first end part is separated from the first shell part, and the second folding part is positioned between the first folding part and the first end part. The application also discloses an electric device comprising the battery. The battery can reduce the influence of wrinkles on the battery.

Description

Battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery and electric equipment.

Background

In the production process of the arc-shaped battery, the packaged arc-shaped battery is provided with two arc-shaped surfaces and an edge sealing positioned between the two arc-shaped surfaces in the thickness direction. When the edge seal is turned over towards one of the arc-shaped surfaces, folds can be generated by the compression of the edge seal, so that the appearance and the size of the battery are influenced.

Disclosure of Invention

In view of the above, it is desirable to provide a battery and an electric device that can reduce the influence of wrinkles on the battery.

Embodiments of the present application provide a battery including an electrode assembly and a first conductive plate connected to the electrode assembly, and a case covering at least a portion of the first conductive plate. The housing includes a first housing piece including a first face curved in a first direction and a second housing piece including a second face disposed spaced apart from the first face in a second direction. The second direction is perpendicular to the first direction. The second face is bent in the first direction and clamps the electrode assembly together with the first face. The case further includes a first portion having a projection that at least partially overlaps a projection of the electrode assembly along the third direction. The third direction is perpendicular to both the first direction and the second direction. The first housing piece is joined to the second housing piece. The first portion includes a first folded portion, a second folded portion, and a first end portion. The first folding part is connected to the joint of the first shell part and the second shell part, the first end part is separated from the first shell part, and the second folding part is positioned between the first folding part and the first end part. The battery further includes a first side portion contiguous with the first face and the first portion, and a second side portion contiguous with the second face and the first portion, the first portion further including a first region located between the first and second folded portions and facing the first side portion in the third direction, and a second region located between the second folded portion and the first end portion and facing the second side portion in the third direction.

The first portion is folded back in the second direction by the first folded-back portion and the second folded-back portion to form a folded area, and the shape of the folded area is controllable by controlling the overlapping relationship of the first area and the second area in the third direction. Specifically, the first region enables the first folding portion to be folded and bent from the first connecting portion along the second direction toward the first surface, so as to reduce the risk that the first folding portion is bent along different directions and is overlapped to generate wrinkles, and further reduce the influence of the wrinkles on the battery. And the first folding back part can also reduce the risk that the side edge of the first folding back part, which is far away from the joint of the first shell part and the second shell part, pulls the joint due to bending, so that the pulling force generated on the joint of the first shell part and the second shell part when the first part is folded back is reduced, the risk of electrolyte leakage caused by the fracture of the joint is reduced, and the safety of the battery is further improved.

In some embodiments of the present application, along the second direction, the first portion includes a first side folded back toward the first face side and extending along the first direction, a second side folded back toward the second face side in the first region and extending along the first direction, and a third side located opposite the second side in the second region and extending along the first direction. The first edge extends along a packaging line at the joint of the first housing piece and the second housing piece so as to improve the packaging reliability of the joint of the first housing piece and the second housing piece. The overlapping relation of the first area and the second area in the third direction is controlled by controlling the positions of the second edge and the third edge in the second direction, so that the shape of the folding area is controllable.

In some embodiments of the present application, the first edge is tangentially disposed to the second edge. At the point where the first edge is tangent to the second edge, the second folded-back portion is folded back and bent towards the second face in two directions at the point of tangency to reduce the risk of wrinkles occurring at the point of tangency. Viewed in the third direction, a portion of the first portion on the side of the first edge facing the first face forms a double-folded structure and a portion of the first portion on the side of the first edge facing the second face forms a single-folded structure.

In some embodiments of the present application, the first side is disposed to be curved in the first direction. The first edge is bent and extended along the packaging line at the joint of the first shell piece and the second shell piece so as to be matched with the packaging line at the joint of the first shell piece and the second shell piece, and the packaging reliability of the joint of the first shell piece and the second shell piece is improved.

In some embodiments of the present application, the first portion has a third area between the first face and the second face in the first direction and a fourth area outside the first face and the second face in the first direction, as viewed in the third direction. The first portion has a third region overlapping the first face in the third direction and a fourth region spaced apart from the first face in the third direction, as viewed in the second direction. The third area is used for being connected with the first side portion and the second side portion, and packaging reliability of the connection portion of the first side portion and the second side portion is improved. The fourth region is used for being connected with the sealing edge parts at two ends of the battery along the first direction, and the overall packaging reliability of the shell is improved.

In some embodiments of the present application, the first region and the second region at least partially overlap along the third direction, so that the first portion forms a folded edge region, and the shape of the folded edge region is controllable by controlling the overlapping relationship between the first region and the second region, so as to reduce the risk of the first portion generating wrinkles, and further reduce the influence of the wrinkles on the battery.

In some embodiments of the present application, the first portion is provided with a first layer, and the first region and the second region are joined by the first layer. The first region is connected with the second region through the first layer, so that the stability of the first part of structure is improved, the space occupied by the battery in the third direction can be reduced, and the energy density of the battery is improved.

In some embodiments of the present application, the first face is curved in a manner protruding from a side opposite to the second face, as viewed in the third direction, to increase a space of the case in which the electrode assembly is accommodated, thereby increasing energy density of the battery.

In some embodiments of the application, the second face is curved in a manner of protruding from one side of the first face, as viewed along the third direction, so that the battery has the same curved trend in the first direction, which facilitates the battery to be adapted to a preset curved battery compartment in the electronic device, and meets the personalized requirement of the electronic device.

In some embodiments of the present application, along the second direction, the first distance between the two ends of the first region includes a portion longer than the second distance between the two ends of the second region, where the portion is a third portion where the first folded portion is not covered by the second folded portion, and the third portion is used for being connected with the sealing edge portions at the two ends of the battery along the first direction, so as to improve the packaging reliability of the whole case.

In some embodiments of the application, along the second direction, a first distance between two end portions of the first region includes a portion shorter than a second distance between two end portions of the second region, the portion is a fourth portion where the first folded portion and the second folded portion overlap, the fourth portion forms a folded edge region, and the shape of the folded edge region is controllable by controlling an overlapping relationship between the first region and the second region, so as to reduce a risk that the first portion generates a wrinkle, and further reduce an influence of the wrinkle on the battery.

In some embodiments of the application, in the third region, along the second direction, a first distance between two end portions of the first region includes a portion shorter than a second distance between two end portions of the second region, where the portion is a fourth portion where the first folded portion and the second folded portion are overlapped, the fourth portion forms a folded edge region, and a shape of the folded edge region is controllable by controlling an overlapping relationship of the first region and the second region in the third direction, so as to reduce a risk that the first portion generates a wrinkle, and further reduce an influence of the wrinkle on the battery.

In some embodiments of the application, in the fourth region, along the second direction, a first distance between two end portions of the first region includes a portion longer than a second distance between two end portions of the second region, where the portion is a third portion where the first folded portion is not covered by the second folded portion, and the third portion is used for being connected with the sealing edge portions at two ends of the battery along the first direction, so that the packaging reliability of the whole case is improved.

An embodiment of the present application further provides an electric device including the battery described above.

In the battery and the electric equipment provided by the embodiment of the application, the first part forms the folding edge area by the first folding part and the second folding part which are folded along the second direction, and the shape of the folding edge area is controllable by controlling the overlapping relation of the first area and the second area in the third direction. Specifically, the first region enables the first folding portion to be folded and bent from the first connecting portion along the second direction toward the first surface, so as to reduce the risk that the first folding portion is bent along different directions and is overlapped to generate wrinkles, and further reduce the influence of the wrinkles on the battery. And the first folding back part can also reduce the risk that the side edge of the first folding back part, which is far away from the joint of the first shell part and the second shell part, pulls the joint due to bending, so that the pulling force generated on the joint of the first shell part and the second shell part when the first part is folded back is reduced, the risk of electrolyte leakage caused by the fracture of the joint is reduced, and the safety of the battery is further improved.

Drawings

Fig. 1 is a schematic diagram of a first structure of a battery according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram illustrating an exploded structure of a battery according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a battery case according to an embodiment of the present disclosure.

Fig. 4 is a schematic diagram of a first side structure of a battery according to an embodiment of the present disclosure.

Fig. 5 is an expanded view of a third portion of a battery in a second direction according to an embodiment of the present disclosure.

Fig. 6 is a first partially enlarged schematic view in section III of fig. 4.

Fig. 7 is a second partially enlarged schematic view in section IV of fig. 4.

Fig. 8 is a third partially enlarged schematic view in V portion of fig. 4.

Fig. 9 is a schematic diagram of a second side structure of a battery according to an embodiment of the present disclosure.

Fig. 10 is a first partially enlarged schematic view of fig. 9.

Fig. 11 isbase:Sub>A schematic view ofbase:Sub>A first cross-sectional structurebase:Sub>A-base:Sub>A ofbase:Sub>A battery in an embodiment of the present application.

Fig. 12 is a schematic diagram of a second cross-sectional structure B-B of a battery according to an embodiment of the present application.

Fig. 13 is a schematic view of a third cross-sectional structure of a battery cell according to an embodiment of the present application.

Fig. 14 is a schematic view of a fourth cross-sectional view of a battery in an embodiment of the present application.

Fig. 15 is a schematic view of a fifth cross-sectional view E-E of a battery according to an embodiment of the present application.

Fig. 16 is a second structural diagram of a battery according to an embodiment of the present application.

Fig. 17 is a schematic view of a sixth cross-sectional view F-F of a battery according to an embodiment of the present application.

Fig. 18 is a schematic diagram of a third structure of a battery according to an embodiment of the present application.

Fig. 19 is a schematic diagram of a seventh cross-sectional structure H-H of a battery according to an embodiment of the present application.

Fig. 20 is a schematic structural diagram of an electric device according to an embodiment of the present application.

Description of the main elements

Battery 100

Power utilization device 200

Electrode assembly 10

First conductive part plate 11

Second conductive part plate 12

Housing 20

First housing part 21

First side 211

Second housing part 22

Second side 221

First part 23

First region 23a

Second region 23b

Third region 23c

Fourth region 23d

First connection portion 23e

Second connecting portion 23f

First folding part 231

First edge 231a

Second folded back portion 232

Second edge 232a

First end 233

First side 234

Second side 235

Third side 236

First layer 237

First portion 237a

Second portion 237b

Second layer 238

Second part 24

First side portion 31

Third side portion 32

Fifth side part 33

Seventh side 34

Second side portion 41

Fourth side portion 42

Sixth side 43

The eighth side 44

Third part 51

Fourth section 52

Point of tangency 60

First direction X

Second direction Z

Third direction Y

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, 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 in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. The terms "vertical," "horizontal," "left," "right," "top," "bottom," and the like as used herein are for illustrative purposes only and are not intended to limit the present application.

It will be understood that in actual manufacture or use, when two elements are arranged in parallel, there may be an angle between the elements which allows for a tolerance of 0- ± 5%, for example when there is a tolerance of two elements being perpendicular, one of the elements being inclined towards or away from the other, the tolerance between the elements being in the range 0 ° to 4.5 °, excluding 0 °. When the projections of two elements are identical or overlap, a tolerance of 0- ± 10% is allowed between the two elements, for example, a tolerance of 0- ± 10% is allowed for the projected area where one element is identical in shape to the other element.

Embodiments of the present application provide a battery including an electrode assembly and a first conductive plate connected to the electrode assembly, and a case covering at least a portion of the first conductive plate. The housing includes a first housing piece including a first face curved in a first direction and a second housing piece including a second face disposed spaced apart from the first face in a second direction. The second direction is perpendicular to the first direction. The second face is bent in the first direction and clamps the electrode assembly together with the first face. The case further includes a first portion having a projection that at least partially overlaps a projection of the electrode assembly along the third direction. The third direction is perpendicular to both the first direction and the second direction. The first housing piece is connected to the second housing piece. The first portion includes a first folded back portion, a second folded back portion, and a first end portion. The first folding part is connected with the joint of the first shell part and the second shell part, the first end part is separated from the first shell part, and the second folding part is positioned between the first folding part and the first end part. The battery further includes a first side portion contiguous with the first face and the first portion, and a second side portion contiguous with the second face and the first portion, the first portion further including a first region located between the first and second folded portions and facing the first side portion in the third direction, and a second region located between the second folded portion and the first end portion and facing the second side portion in the third direction.

An embodiment of the application provides an electric device, which comprises the battery.

In the battery and the electric equipment provided by the embodiment of the application, the first part forms the folding edge area by the first folding part and the second folding part which are folded along the second direction, and the shape of the folding edge area is controllable by controlling the overlapping relation of the first area and the second area in the third direction. Specifically, the first region enables the first folding portion to be folded and bent from the first connecting portion along the second direction toward the first surface, so as to reduce the risk that the first folding portion is bent along different directions to overlap and generate wrinkles, and further reduce the influence of the wrinkles on the battery. And the first folding back part can also reduce the risk that the side edge of the first folding back part, which is far away from the joint of the first shell part and the second shell part, pulls the joint due to bending, so that the pulling force generated on the joint of the first shell part and the second shell part when the first part is folded back is reduced, the risk of electrolyte leakage caused by the fracture of the joint is reduced, and the safety of the battery is further improved.

Some embodiments will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 and 2, the present application provides a battery 100 including an electrode assembly 10, a first conductive plate 11 connected to the electrode assembly 10, and a case 20 covering at least a portion of the first conductive plate 11.

The housing 20 includes a first housing piece 21 and a second housing piece 22. The first and

second housing pieces

21 and 22 are disposed opposite to each other in the second direction Z. The first direction X is perpendicular to the second direction Z, and the first housing member 21 includes a first face 211 curved in the first direction X. The second housing piece 22 includes a second face 221 spaced from the first face 211 in the second direction Z. Wherein the second face 221 is bent in the first direction X and sandwiches the electrode assembly 10 together with the first face 211.

In some embodiments, the electrode assembly 10 is an arc-shaped structure bent in the first direction X.

In some embodiments, the electrode assembly 10 is of a coiled or laminated construction.

In some embodiments, the first conductive plate 11 protrudes from the housing 20 in the first direction X. It will be appreciated that in some embodiments, the battery 100 further comprises a second electrically conductive plate 12, the second electrically conductive plate 12 projecting from the housing 20 in the first direction X, the second electrically conductive plate 12 being spaced apart from the first electrically conductive plate 11 and having a different polarity. In some embodiments, the first conductive plate 11 is a positive electrode tab and the second conductive plate 12 is a negative electrode tab.

Referring to fig. 3, in some embodiments, the battery 100 further includes a first side 31 connected to the first side 211 and the first portion 23, and a second side 41 connected to the second side 221 and the first portion 23. Specifically, the first folded part 231 is connected to the first side part 31, and the second folded part 232 is at least partially connected to the second side part 41, so as to further reduce the space occupied by the battery 100 in the third direction Y and improve the energy density of the battery 100.

In some embodiments, the battery 100 further includes a third side 32, a fifth side 33, and a seventh side 34. The first side 31, the third side 32, the fifth side 33 and the seventh side 34 extend from the first face 211 in the second direction Z. And the first side portion 31, the third side portion 32, the fifth side portion 33, and the seventh side portion 34 enclose a cavity in which the electrode assembly 10 is accommodated.

In some embodiments, the battery 100 further includes a fourth side 42, a sixth side 43, and an eighth side 44. The second side 41, the fourth side 42, the sixth side 43, and the eighth side 44 extend from the second face 221 toward the first face 211 in the second direction Z. And the second, fourth, sixth and

eighth sides

41, 42, 43 and 44 enclose a cavity in which the electrode assembly 10 is accommodated. The side edge of the second side portion 41 away from the second surface 221 is connected with the side edge of the first side portion 31 away from the first surface 211 and forms a packaging line at the joint of the first and

second casing members

21 and 22, and the first portion 23 is used for sealing the packaging line so as to improve the packaging reliability at the joint of the first and

second casing members

21 and 22.

In some embodiments, the housing 20 further includes a first portion 23. Along the third direction Y, a projection of the first portion 23 at least partially overlaps a projection of the electrode assembly 10. The third direction Y is perpendicular to both the first direction X and the second direction Z.

Referring also to fig. 4, the first and

second casing members

21 and 22 are connected to hold the electrode assembly 10 in the second direction Z. The first portion 23 includes a first folded portion 231, a second folded portion 232, and a first end 233. The first folded portion 231 is connected to the junction of the first and

second housing pieces

21 and 22, the first end portion 233 is spaced apart from the first housing piece 21, and the second folded portion 232 is located between the first folded portion 231 and the first end portion 233. At least a portion of the second fold-back 232 meets the first housing piece 21 and/or the second housing piece 22.

In some embodiments, along the third direction Y, a projection of the first folded portion 231 at least partially overlaps a projection of the electrode assembly 10, and a projection of the second folded portion 232 at least partially overlaps a projection of the electrode assembly 10.

In some embodiments, along the first direction X, the first folded back portion 231 includes a first edge 231a, and the second folded back portion 232 includes a second edge 232a that meets the first edge 231a, with both the first edge 231a and the second edge 232a being distal from the first shell member 21.

The first portion 23 serves to improve the packaging reliability at the junction of the first and

second case members

21 and 22, thereby improving the safety of the battery 100. Specifically, in the first portion 23, the first fold 231 is connected to the junction of the first and

second housing pieces

21, 22 to seal the junction of the first and

second housing pieces

21, 22. And the tensile force generated at the joint of the first and

second case members

21 and 22 when the first portion 23 is folded back is reduced by the first folded-back portion 231 to reduce the risk of the joint breaking to cause leakage of the electrolyte.

Referring to fig. 5, the first portion 23 further includes a first region 23a between the first folded portion 231 and the second folded portion 232, and a second region 23b between the second folded portion 232 and the first end 233. The first portion 23 further includes a first connection portion 23e and a second connection portion 23f. The first connecting portion 23e is connected to the first folding portion 231 on one side and connected to the joint of the first housing member 21 and the second housing member 22 on the other side. The second connection portion 23f is connected to a portion of the first folded portion 231 away from the first connection portion 23e on one side, and connected to the second folded portion 232 on the other side. The first connection portion 23e and the second connection portion 23f are reversely bent to fold back the first region 23a and the second region 23b in the second direction Z in the second direction.

The first region 23a is bent in a third direction Y toward the first side portion 31 so that the first folded portion 231 is folded back toward the first surface 211 from the first connection portion 23e in the second direction Z. The second region 23b bends the second folded portion 232 folded back toward the second face 221 in the second direction Z toward the second side portion 41 in the third direction Y.

The first and second folded

portions

231 and 232 are folded back in the second direction Z to form the first portion 23 as a folded area, and the shape of the folded area is controllable by controlling the overlapping relationship of the first and

second regions

23a and 23b in the third direction Y. The first region 23a enables the first folding portion 231 to be folded and bent from the first connection portion 23e along the second direction Z toward the first surface 211, so as to reduce the risk that the first folding portion 231 is folded and folded along different directions to generate wrinkles, and further reduce the influence of the wrinkles on the battery 100. In addition, the first folded part 231 can also reduce the risk that the side edge of the first folded part 231, which is far away from the joint of the first casing piece 21 and the second casing piece 22, pulls the joint due to bending, so that the tensile force generated on the joint of the first casing piece 21 and the second casing piece 22 when the first part 23 is folded back is reduced, the risk of electrolyte leakage caused by fracture of the joint is reduced, and the safety of the battery is further improved.

With continued reference to fig. 4 and 5, in some embodiments, along the second direction Z, the first portion 23 includes a first edge 234 folded back toward the first side 211 and extending along the first direction X. The first edge 234 extends along a packaging line at the junction of the first and

second housing pieces

21, 22 to improve the packaging reliability at the junction of the first and

second housing pieces

21, 22. The first section 23 further includes a second edge 235 folded back toward the second face 221 side in a connecting portion of the first section 23a and the second section 23b and extending in the first direction X, and a third edge 236 located on the opposite side of the second edge 235 in the second direction Z and extending in the first direction X in the second section 23b. By controlling the positions of the second edge 235 and the third edge 236 in the second direction Z, the overlapping relationship of the first region 23a and the second region 23b in the third direction Y is controlled, and the shape of the folded region is controlled.

In some embodiments, second edge 235 is positioned between first edge 234 and first face 211, as viewed in third direction Y, such that first return 231 is positioned between first edge 234 and first face 211. The third edge 236 is positioned between the first side 211 and the second side 221 such that the second fold 232 is positioned between the first side 211 and the second side 221. By this arrangement, the risk that the first portion 23 protrudes from the first face 211 and/or the second face 221 in the second direction Z is reduced, so that the space occupied by the battery 100 in the second direction Z is controlled, and the energy density of the battery 100 is improved.

With continued reference to fig. 4, in some embodiments, the first edge 234 is curved in the first direction X. Specifically, the package line at the junction of the first and

second case members

21 and 22 is arranged bent in the first direction X. The first edge 234 is bent and extended along the sealing line at the junction of the first and

second casing members

21 and 22 to fit the sealing line at the junction of the first and

second casing members

21 and 22, thereby improving the sealing reliability at the junction of the first and

second casing members

21 and 22.

Referring to fig. 6 and 11, in some embodiments, the first edge 234 is disposed tangentially to the second edge 235, and at a point 60 where the first edge 234 is tangential to the second edge 235, the second folded portion 232 is folded back and bent toward the second surface 221 along the second direction Z to reduce a risk of generating a wrinkle at the point 60. Viewed in the third direction Y, a portion of the first portion 23 on the side of the first edge 234 facing the first face 211 forms a double-folded structure, and a portion of the first portion 23 on the side of the first edge 234 facing the second face 221 forms a single-folded structure.

Specifically, in some implementations, first edge 234 is curved in first direction X, and first edge 234 and second edge 235 are tangent to first edge 234 at a midpoint in first direction X. This midpoint location allows for a tolerance range of 0 to ± 5%.

Referring to fig. 7 and 8, in some embodiments, the first region 23a and the second region 23b at least partially overlap along the third direction Y, such that the first portion 23 forms a folding edge region, and the shape of the folding edge region is controllable by controlling the overlapping relationship between the first region 23a and the second region 23b. The first region 23a enables the first folding portion 231 to be folded and bent from the first connection portion 23e along the second direction Z toward the first surface 211, so as to reduce the risk that the first folding portion 231 is bent along different directions to overlap and generate wrinkles, and further reduce the influence of the wrinkles on the battery 100. In addition, the first region 23a can also reduce the risk that the side edge of the first folded part 231, which is far away from the joint of the first casing piece 21 and the second casing piece 22, pulls the joint due to bending, so that the tensile force generated on the joint of the first casing piece 21 and the second casing piece 22 when the first part 23 is folded back is reduced, the risk of electrolyte leakage caused by the fracture of the joint is reduced, and the safety of the battery is further improved.

Referring to fig. 7, 12 and 14, in some embodiments, a first distance L1 between two end portions of the first region 23a is a distance between the first side 234 and the second side 235 in the second direction Z; the second distance L2 between the two ends of the second region 23b is the distance between the second edge 235 and the third edge 236 in the second direction Z. The first distance L1 between both ends of the first region 23a includes a portion longer than the second distance L2 between both ends of the second region 23b in the second direction Z, that is, the third portion 51 where the first folded portion 231 is away from the second folded portion 232. In some embodiments, the third portions 51 are located at two ends of the first region 23a along the first direction X, so as to be connected to the sealing portions at two ends of the battery 100 along the first direction X, thereby improving the overall packaging reliability of the housing 20.

It can be understood that the first distance L1 between the two ends of the first region 23a includes a portion shorter than the second distance L2 between the two ends of the second region 23b, the first distance L1 in the portion is defined as a third distance L3, the portion is the fourth portion 52 where the first folded portion 231 overlaps the second folded portion 232, the fourth portion 52 forms a folded edge region, and the shape of the folded edge region is controllable by controlling the overlapping relationship between the first region 23a and the second region 23b, so as to reduce the risk of the first portion 23 being folded, and further reduce the influence of the folded edge on the battery 100.

Referring to fig. 8, 13 and 15, in some embodiments, along the second direction Z, a first distance L1 between two end portions of the first region 23a includes a portion shorter than a second distance L2 between two end portions of the second region 23b, which is a fourth portion 52 where the first folded portion 231 and the second folded portion 232 are overlapped, the fourth portion 52 forms a folded edge region, and the shape of the folded edge region is controllable by controlling the overlapping relationship between the first region 23a and the second region 23b, so as to reduce the risk of the first portion 23 being folded, and further reduce the influence of the folded edge on the battery 100.

Referring to fig. 4 again, in some embodiments, a relationship between a first distance L1 between two end portions of the first region 23a and a second distance L2 between two end portions of the second region 23b is: along the first direction X, the first distance L1 is larger than the second distance L2; then, the distance difference between the first distance L1 and the second distance L2 is gradually reduced until the first distance L1 and the second distance L2 are equal; then the second distance L2 is greater than the first distance L1, and the distance difference between the first distance L1 and the second distance L2 gradually increases until the first distance L1 is at a minimum value (e.g., the first distance L1 is equal to zero when the first edge 234 is tangent to the second edge 235); then, the distance difference between the first distance L1 and the second distance L2 is gradually reduced until the first distance L1 and the second distance L2 are equal; finally, the first distance L1 is greater than the second distance L2, and the distance difference between the first distance L1 and the second distance L2 gradually increases.

Referring again to fig. 3, in some embodiments, the first portion 23 has a third area 23c between the first surface 211 and the second surface 221 in the first direction X and a fourth area 23d outside the first surface 211 and the second surface 221 in the first direction X, as viewed along the third direction Y. The third region 23c is used to contact the first side portion 31 and the second side portion 41, and improves the reliability of the package at the contact portion of the first side portion 31 and the second side portion 41. The fourth region 23d is used for connecting to the sealing portions at both ends of the battery 100 in the first direction X, and improves the reliability of the package of the entire case 20.

In some embodiments, in the third region 23c, along the second direction Z, the first distance L1 between two end portions of the first region 23a includes a portion shorter than the second distance L2 between two end portions of the second region 23b, which is the fourth portion 52 where the first folded portion 231 overlaps the second folded portion 232, the fourth portion 52 forms a folded edge region, and the shape of the folded edge region is controllable by controlling the overlapping relationship between the first region 23a and the second region 23b, so as to reduce the risk of the first portion 23 being folded, and further reduce the influence of the folded edge on the battery 100.

In some embodiments, in the fourth zone 23d, along the second direction Z, the first distance L1 between the two end portions of the first zone 23a includes a longer portion than the second distance L2 between the two end portions of the second zone 23b, that is, the third portion 51 where the first folded portion 231 is not covered by the second folded portion 232. The third portion 51 facilitates connection with the sealing portion at one end of the battery 100 in the first direction X, and improves the reliability of the package of the entire case 20.

Referring to fig. 9 and 10, in some embodiments, first portion 23 is provided with a first layer 237. Specifically, when the first and

second folds

231 and 232 of the first portion 23 are unfolded to the same plane along the third direction Y, the first portion 23 is provided with a first layer 237 and a second layer 238 oppositely disposed along the second direction Z, the first layer 237 faces the second face 221, and the second layer 238 faces the first face 211.

In some embodiments, when the first and

second folds

231, 232 of the first portion 23 are completely folded, the first layer 237 includes a first region 237a and a second region 237b along the third direction Y. The first portion 237a is located between the first folding portion 231 and the second folding portion 232, and the first folding portion 231 and the second folding portion 232 are connected and fixed by the first portion 237a, so as to improve the structural stability between the first folding portion 231 and the second folding portion 232. The second portion 237b is located between the second folded portion 232 and the second side portion 41, and the second folded portion 232 and the second side portion 41 are connected and fixed by the second portion 237b, so as to improve the stability of the structure between the second folded portion 232 and the second folded portion 232. The second layer 238 is disposed between the first folding portion 231 and the first side portion 31, and the first folding portion 231 and the first side portion 31 are connected and fixed by the second layer 238, so as to improve the structural stability between the first folding portion 231 and the first side portion 31.

In some embodiments, the first layer 237 is made of a material such as polyurethane or polyolefin; the second layer 238 is made of a material such as polyurethane or polyolefin.

In some embodiments, battery 100 further includes second portion 24, a side of sixth side 43 away from second face 221 is connected to a side of fifth side 33 away from first face 211 and forms an encapsulation line that is the junction of first and

second casing members

21 and 22, and second portion 24 is used to seal the encapsulation line to improve the reliability of the encapsulation at the junction of first and

second casing members

21 and 22. The second portion 24 has the same structure as the first portion 23, and the second portion 24 and the first portion 23 are symmetrically disposed, which is not described herein.

Referring to fig. 1 and fig. 2 again, in some embodiments, the second surface 221 is curved in a manner of protruding from the first surface 211 side when viewed along the third direction Y, so that the battery 100 has the same curved trend in the first direction X, which facilitates the battery 100 to be adapted to a preset curved battery compartment in the electronic device, thereby meeting the personalized requirements of the electronic device.

Referring to fig. 16, in some embodiments, the first face 211 is curved in a manner protruding from a side opposite to the second face 221 when viewed in the third direction Y, so as to increase a space of the case 20 for accommodating the electrode assembly 10 and increase energy density of the battery 100.

Referring to fig. 17, in some embodiments, the first edge 234 is disposed tangentially to the second edge 235, the first edge 234 is tangent to the second edge 235 at the point 60, and the second folded portion 232 is folded back and bent toward the second surface 221 along the second direction Z at the point 60, so as to reduce the risk of wrinkles occurring at the point 60. Viewed in the third direction Y, a portion of the first portion 23 on the side of the first edge 234 facing the first face 211 forms a double-folded structure, and a portion of the first portion 23 on the side of the first edge 234 facing the second face 221 forms a single-folded structure.

Referring to fig. 18 and 19, in some embodiments, the first edge 234 and the second edge 235 are spaced apart from each other in the second direction Z, and when viewed along the third direction Y, the second edge 235 is located between the first edge 234 and the first surface 211, a portion of the first portion 23 located on a side of the first edge 234 facing the first surface 211 forms a double-folded structure, and a portion of the first portion 23 located on a side of the first edge 234 facing the second surface 221 forms a single-folded structure. The first side 234 and the second side 235 are spaced in the second direction Z to increase the area of the double-folded structure, so that the space occupied by the second folded portion 232 in the second direction Z is reduced, and the energy density of the battery 100 is improved.

Referring to fig. 20, an electric device 200 is further provided in the embodiment of the present application, including any one of the batteries 100 in the above embodiments, where the battery 100 is used to supply power to the electric device 200.

In the battery 100 and the electric device 200, the first portion 23 is folded back in the second direction Z by the first folded back portion 231 and the second folded back portion 232 to form a folded edge region, and the shape of the folded edge region is controlled by controlling the overlapping relationship of the first region 23a and the second region 23b in the third direction Y. The first region 23a enables the first folding portion 231 to be folded and bent from the first connection portion 23e along the second direction Z toward the first surface 211, so as to reduce the risk that the first folding portion 231 is folded and folded along different directions to generate wrinkles, and further reduce the influence of the wrinkles on the battery 100. In addition, the first folded back part 231 can also reduce the risk that the side edge of the first folded back part 231, which is far away from the joint of the first shell member 21 and the second shell member 22, pulls the joint due to bending, so that the tensile force generated on the joint of the first shell member 21 and the second shell member 22 when the first part 23 is folded back is reduced, the risk of electrolyte leakage caused by the fracture of the joint is reduced, and the safety of the battery is further improved.

In addition, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present application, and that suitable changes and modifications to the above embodiments are within the scope of the disclosure of the present application as long as they are within the true spirit and scope of the present application.

Claims

1. A battery including an electrode assembly and a first conductive plate connected to the electrode assembly, and a case covering at least a part of the first conductive plate,

the case includes a first case member including a first face bent in a first direction, and a second case member including a second face disposed apart from the first face in a second direction perpendicular to the first direction, the second face bent in the first direction and sandwiching the electrode assembly together with the first face,

the case further includes a first portion having a projection at least partially overlapping a projection of the electrode assembly in a third direction perpendicular to both the first direction and the second direction,

the first housing piece is joined to the second housing piece,

the first portion comprises a first folded portion, a second folded portion and a first end portion, the first folded portion is connected to the joint of the first housing piece and the second housing piece, the first end portion is separated from the first housing, the second folded portion is located between the first folded portion and the first end portion,

the battery further includes a first side portion bordering the first face and the first portion, and a second side portion bordering the second face and the first portion, along the second direction,

the first portion further includes a first region between the first and second folded portions and facing the first side portion in the third direction, and a second region between the second folded portion and the first end portion and facing the second side portion in the third direction.

2. The battery according to claim 1, wherein the first portion includes, in the second direction, a first side folded back toward the first face side and extending in the first direction, a second side folded back toward the second face side in the first region and extending in the first direction, and a third side located opposite the second side in the second region and extending in the first direction.

3. The battery of claim 2, wherein the first edge is tangential to the second edge.

4. The battery of claim 2, wherein the first edge is disposed to be curved in the first direction.

5. The battery according to claim 1, wherein the first portion has a third region between the first face and the second face in the first direction and a fourth region outside the first face and the second face in the first direction, as viewed in the third direction.

6. The battery of claim 1, wherein the first region and the second region at least partially overlap along the third direction.

7. The battery of claim 1, wherein the first portion is provided with a first layer, the first region and the second region being joined by the first layer.

8. The battery according to claim 1, wherein the first face is curved so as to protrude from a side opposite to the second face, as viewed in the third direction.

9. The battery according to claim 8, wherein the second face is curved so as to protrude from the first face side as viewed in the third direction.

10. The battery according to claim 1, wherein a first distance between both ends of the first region includes a portion longer than a second distance between both ends of the second region in the second direction.

11. The battery according to claim 1, wherein a first distance between both ends of the first region includes a portion shorter than a second distance between both ends of the second region in the second direction.

12. The battery according to claim 5, wherein in the third region, a first distance between both end portions of the first region includes a portion shorter than a second distance between both end portions of the second region in the second direction.

13. The battery according to claim 5, wherein in the fourth region, a first distance between both end portions of the first region includes a portion longer than a second distance between both end portions of the second region in the second direction.

14. An electrical device comprising a battery according to any one of claims 1 to 13.