Battery and electric device

Abstract

The application discloses a battery, which comprises an electrode assembly, a first conductive plate connected to the electrode assembly, and a shell. The shell comprises a first shell part and a second shell part. The first shell part comprises a first surface curved along a first direction, and the second shell part comprises a second surface spaced apart from the first surface along the first direction. The second surface is curved along the first direction and holds the electrode assembly together with the first surface. The shell further comprises a first part, a projection of which overlaps at least partially with a projection of the electrode assembly along a third direction. The first shell part is connected to the second shell part. The first part comprises a first fold, a second fold, and a first end. The first fold is connected to the joint of the first shell part and the second shell part, the first end is located at an end of the first part away from the shell, and the second fold is connected to the first fold and the first end respectively. The application also discloses a power-using device comprising the battery. The battery can reduce the influence of wrinkles on the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery and an electrical device. Background Technology

[0002] During the production of curved batteries, the encapsulated curved battery has two curved surfaces in the thickness direction and a sealing edge located between the two curved surfaces. When the sealing edge is folded towards one of the curved surfaces, the compression of the folded edge will create wrinkles, thus affecting the appearance and size of the battery. Summary of the Invention

[0003] In view of this, it is necessary to provide a battery and electrical device that can reduce the impact of wrinkles on the battery.

[0004] Embodiments of this application provide a battery including an electrode assembly and a first conductive plate connected to the electrode assembly, and a housing covering at least a portion of the first conductive plate. The housing includes a first housing member and a second housing member, the first housing member being connected to the second housing member. The first housing member includes a first surface bent along a first direction, and the second housing member includes a second surface spaced apart from the first surface along the first direction. The second surface is bent along the first direction and together with the first surface clamps the electrode assembly. Both the first and second surfaces extend their lengths along a second direction, the first direction being perpendicular to the second direction. The housing also includes a first portion, the projection of which at least partially overlaps with the projection of the electrode assembly along a third direction. The third direction is perpendicular to both the first and second directions. The first portion includes a first fold-back portion, a second fold-back portion, and a first end portion. The first fold-back portion is connected at the junction of the first housing member and the second housing member, the first end portion is located at the end of the first portion away from the housing, and the second fold-back portion is connected to both sides of the first fold-back portion and the first end portion, respectively. Viewed in a third direction, the battery also includes a first side portion connected to the first surface and the first portion, and a second side portion connected to the second surface and the first portion. The first portion also includes a first region located between the first fold and the second fold and facing the first side portion in a third direction, and a second region located between the second fold and the first end portion and facing the second side portion in a third direction.

[0005] The first portion forms a folded edge area by folding back along a first direction using the first and second folds. The shape of this folded edge area is controllable by controlling the overlap between the first and second areas in a third direction. Specifically, the first area causes the first fold to bend back from the first connecting portion along the first direction towards the first surface. This reduces the risk of wrinkles caused by overlapping due to bending in different directions, thereby reducing the impact of wrinkles on the battery. Furthermore, the first fold also reduces the risk of the side of the first fold away from the junction of the first and second housing components being pulled by bending, thus reducing the tensile force on the junction of the first and second housing components when the first portion is folded back. This reduces the risk of electrolyte leakage due to breakage at the junction, further improving battery safety.

[0006] In some embodiments of this application, along a first direction, the first portion includes a first side extending in a second direction, formed by folding back towards a first surface; a second side extending in the second direction, formed by folding back towards a second surface in a first region; and a third side located opposite the second side and extending in the second direction in the second region. The first side extends along the encapsulation line at the junction of the first and second housing components to improve the encapsulation reliability at the junction of the first and second housing components. By controlling the positions of the second and third sides in the first direction, the overlap relationship between the first and second regions in the third direction is controlled, thereby making the shape of the folded edge area controllable.

[0007] In some embodiments of this application, the first side and the second side are tangent to each other. At the point of tangency between the first and second sides, the second folded portion folds back towards the second surface in one direction to reduce the risk of wrinkles at the point of tangency. Viewed in a third direction, the portion of the first part located on the side of the first side facing the first surface forms a double-folded edge structure, and the portion of the first part located on the side of the first side facing the second surface forms a single-folded edge structure.

[0008] In some embodiments of this application, the first side is bent in a first direction. The first side extends along the encapsulation line at the junction of the first housing member and the second housing member to adapt to the encapsulation line at the junction of the first housing member and the second housing member, thereby improving the encapsulation reliability at the junction of the first housing member and the second housing member.

[0009] In some embodiments of this application, viewed along a third direction, the first portion has a third region located between the first and second surfaces in a second direction, and a fourth region located outside the first and second surfaces in the second direction. Viewed along the first direction, the first portion has a third region overlapping the first surface in a third direction, and a fourth region separated from the first surface in a third direction. The third region is used to connect with the first and second sides, improving the encapsulation reliability at the connection point of the first and second sides. The fourth region is used to connect with the sealing edges at both ends of the battery along the second direction, improving the overall encapsulation reliability of the casing.

[0010] In some embodiments of this application, along a third direction, the first region and the second region at least partially overlap, so that the first part forms a folded edge area, and the shape of the folded edge area is controllable by controlling the overlap relationship between the first region and the second region, so as to reduce the risk of wrinkles in the first part, thereby reducing the impact of wrinkles on the battery.

[0011] In some embodiments of this application, the first part is provided with a first layer, and the first region and the second region are connected through the first layer. The first region and the second region are connected through the first layer to improve the stability of the first part structure and reduce the space occupied by the battery in the third direction, thereby increasing the energy density of the battery.

[0012] In some embodiments of this application, when viewed along a third direction, the first surface is curved in a manner that protrudes to the side opposite to the second surface, thereby increasing the space in the housing to accommodate the electrode assembly and increasing the energy density of the battery.

[0013] In some embodiments of this application, when viewed along a third direction, the second surface is bent in a manner that protrudes toward one side of the first surface, so that the battery has the same bending tendency in the first direction, which facilitates the battery to be adapted to a pre-set curved battery compartment in an electronic device and meets the personalized needs of the electronic device.

[0014] In some embodiments of this application, along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following: the first region includes a portion where the first distance is longer than the second distance, which is the third portion of the first fold-back portion that is not covered by the second fold-back portion. The third portion is used to connect with the sealing edge portions at both ends of the battery along the first direction, thereby improving the overall packaging reliability of the housing.

[0015] In some embodiments of this application, along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following: the first region includes a portion where the first distance is shorter than the second distance, which is the fourth portion where the first fold and the second fold overlap, and the fourth portion forms a folded edge area. By controlling the overlap relationship between the first region and the second region, the shape of the folded edge area is controllable, thereby reducing the risk of wrinkles in the first portion and thus reducing the impact of wrinkles on the battery.

[0016] In some embodiments of this application, in the third region, along the second direction and along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following: the first region includes a portion where the first distance is shorter than the second distance, which is the fourth portion where the first fold and the second fold overlap, and the fourth portion forms a folded edge area. By controlling the overlap relationship between the first region and the second region in the third direction, the shape of the folded edge area is controllable, thereby reducing the risk of wrinkles in the first portion and thus reducing the impact of wrinkles on the battery.

[0017] In some embodiments of this application, in the fourth region, along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following: the first region includes a portion where the first distance is longer than the second distance, which is the third portion of the first fold-back portion that is not covered by the second fold-back portion. The third portion is used to connect with the sealing edge portions at both ends of the battery along the first direction, thereby improving the overall packaging reliability of the housing.

[0018] Embodiments of this application also provide an electrical device, including the battery described above.

[0019] In the battery and electrical device provided by the embodiments of this application, a first portion is formed into a folded edge area by folding back the first and second portions along a first direction, and the shape of the folded edge area is controllable by controlling the overlap relationship between the first and second regions in a third direction. Specifically, the first region causes the first folded portion to bend back from the first connecting portion along the first direction toward the first surface, thereby reducing the risk of wrinkles caused by the first folded portion bending in different directions and overlapping, thus reducing the impact of wrinkles on the battery. Furthermore, the first folded portion can also reduce the risk of the side of the first folded portion away from the junction of the first and second housing components being pulled by bending, thereby reducing the tensile force generated on the junction of the first and second housing components when the first portion is folded back, reducing the risk of electrolyte leakage due to breakage at the junction, and further improving the safety of the battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first structure of a battery in one embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the exploded structure of a battery in one embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the battery casing structure in one embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the first side structure of the battery in one embodiment of this application.

[0024] Figure 5 This is a schematic diagram showing the unfolding of the first part of the battery along a first direction in one embodiment of this application.

[0025] Figure 6 for Figure 4 A magnified schematic diagram of the first part of Part III.

[0026] Figure 7 for Figure 4 A second enlarged schematic diagram of part IV.

[0027] Figure 8 for Figure 4 A magnified schematic diagram of the third part of the V section.

[0028] Figure 9 This is a schematic diagram of the second side structure of the battery in one embodiment of this application.

[0029] Figure 10 for Figure 9 The first enlarged schematic diagram.

[0030] Figure 11 This is a schematic diagram of the first cross-sectional structure of the battery AA in one embodiment of this application.

[0031] Figure 12 This is a schematic diagram of the second cross-sectional structure of the battery in one embodiment of this application.

[0032] Figure 13 This is a schematic diagram of the third cross-sectional structure of the battery in one embodiment of this application.

[0033] Figure 14 This is a schematic diagram of the fourth cross-sectional structure of the battery in one embodiment of this application.

[0034] Figure 15 This is a schematic diagram of the fifth cross-sectional structure of the battery in one embodiment of this application.

[0035] Figure 16 This is a schematic diagram of the second structure of the battery in one embodiment of this application.

[0036] Figure 17 This is a schematic diagram of the sixth cross-sectional structure of the battery in one embodiment of this application.

[0037] Figure 18 This is a schematic diagram of the third structure of the battery in one embodiment of this application.

[0038] Figure 19 This is a schematic diagram of the seventh cross-sectional structure of the battery in one embodiment of this application.

[0039] Figure 20 This is a schematic diagram of the structure of an electrical device in one embodiment of this application.

[0040] Explanation of main component symbols

[0041] Battery 100

[0042] 200 electrical appliances

[0043] Electrode assembly 10

[0044] First conductive plate 11

[0045] Second conductive plate 12

[0046] Casing 20

[0047] First housing component 21

[0048] Page 1, page 211

[0049] Second housing component 22

[0050] Page 221

[0051] Part 1, Chapter 23

[0052] Area 1, 23a

[0053] Second area 23b

[0054] Third area 23c

[0055] Fourth region 23d

[0056] First connecting part 23e

[0057] Second connecting part 23f

[0058] The first turning part 231

[0059] First edge 231a

[0060] Second folded portion 232

[0061] Second edge 232a

[0062] First end 233

[0063] First side 234

[0064] Second side 235

[0065] Third side 236

[0066] First floor 237

[0067] Part 1 237a

[0068] Part 237b

[0069] Second floor 238

[0070] Part 2, 24

[0071] First side section 31

[0072] Third side 32

[0073] Fifth side 33

[0074] Seventh side 34

[0075] Second side 41

[0076] Fourth side 42

[0077] Sixth side 43

[0078] Eighth side 44

[0079] Part 3, 51

[0080] Part 4, 52

[0081] Tangent point 60

[0082] First direction Z

[0083] Second direction X

[0084] Third direction Y Detailed Implementation

[0085] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0086] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have a component that is centrally located. When a component is considered to be "set" on another component, it can be directly set on the other component or may also have a component that is centrally located.

[0087] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "vertical," "horizontal," "left," "right," "top," "bottom," and similar expressions used herein are for illustrative purposes only and are not intended to limit the application.

[0088] It is understandable that in actual production or use, when two components are arranged in parallel, a certain angle may exist between them. The allowable tolerance for this angle is 0-±5%. For example, when two components are perpendicular, one component may tilt towards or away from the other, with a tolerance range of 0° to 4.5° (excluding 0°). When the projections of two components are the same or overlap, a tolerance of 0-±10% is allowed between them. For example, if one component has the same projected shape as the other, the projected area may have a tolerance of 0-±10%.

[0089] Embodiments of this application provide a battery including an electrode assembly and a first conductive plate connected to the electrode assembly, and a housing covering at least a portion of the first conductive plate. The housing includes a first housing member and a second housing member, the first housing member being connected to the second housing member. The first housing member includes a first surface bent along a first direction, and the second housing member includes a second surface spaced apart from the first surface in a second direction. The second surface is bent along the first direction and together with the first surface clamps the electrode assembly. Both the first and second surfaces extend their lengths along the second direction, which is perpendicular to the second direction. The housing also includes a first portion, the projection of which at least partially overlaps with the projection of the electrode assembly along a third direction. The third direction is perpendicular to both the first and second directions. The first portion includes a first fold-back portion, a second fold-back portion, and a first end portion. The first fold-back portion is connected at the junction of the first housing member and the second housing member, the first end portion is located at the end of the first portion away from the housing, and the second fold-back portion is connected to both sides of the first fold-back portion and the first end portion, respectively. Viewed in a third direction, the battery also includes a first side portion connected to the first surface and the first portion, and a second side portion connected to the second surface and the first portion. The first portion also includes a first region located between the first fold and the second fold and facing the first side portion in a third direction, and a second region located between the second fold and the first end portion and facing the second side portion in a third direction.

[0090] An embodiment of this application provides an electrical device including the battery described above.

[0091] In the battery and electrical device provided by the embodiments of this application, a first portion is formed into a folded edge area by folding back the first and second portions along a first direction, and the shape of the folded edge area is controllable by controlling the overlap relationship between the first and second regions in a third direction. Specifically, the first region causes the first folded portion to bend back from the first connecting portion along the first direction toward the first surface, thereby reducing the risk of wrinkles caused by the first folded portion bending in different directions and overlapping, thus reducing the impact of wrinkles on the battery. Furthermore, the first folded portion can also reduce the risk of the side of the first folded portion away from the junction of the first and second housing components being pulled by bending, thereby reducing the tensile force generated on the junction of the first and second housing components when the first portion is folded back, reducing the risk of electrolyte leakage due to breakage at the junction, and further improving the safety of the battery.

[0092] Some embodiments will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0093] Please refer to the following: Figure 1 and Figure 2 This application provides a battery 100, including an electrode assembly 10 and a first conductive plate 11 connected to the electrode assembly 10, and a housing 20 covering at least a portion of the first conductive plate 11.

[0094] The housing 20 includes a first housing member 21 and a second housing member 22. The first housing member 21 and the second housing member 22 are disposed opposite to each other along a first direction Z. A second direction X is perpendicular to the first direction Z. The first housing member 21 includes a first surface 211 that is bent along the first direction Z. The second housing member 22 includes a second surface 221 that is spaced apart from the first surface 211 along the first direction Z. Both the first surface 211 and the second surface 221 extend their lengths along the second direction X. The second surface 221 is bent along the first direction Z and together with the first surface 211 clamps the electrode assembly 10.

[0095] In some embodiments, the electrode assembly 10 is an arc-shaped structure bent along a first direction Z.

[0096] In some embodiments, the electrode assembly 10 has a wound structure or a stacked structure.

[0097] In some embodiments, the first conductive plate 11 extends from the housing 20 along the second direction X. It is understood that in some embodiments, the battery 100 further includes a second conductive plate 12 extending from the housing 20 along the second direction X, the second conductive plate 12 being spaced apart from the first conductive plate 11 and having different polarities. In some embodiments, the first conductive plate 11 is a positive electrode tab, and the second conductive plate 12 is a negative electrode tab.

[0098] Please see Figure 3 In some embodiments, the battery 100 further includes a first side portion 31 connected to the first surface 211 and the first portion 23, and a second side portion 41 connected to the second surface 221 and the first portion 23. Specifically, the first fold-back portion 231 is connected to the first side portion 31, and the second fold-back portion 232 is at least partially connected to the second side portion 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.

[0099] In some embodiments, the battery 100 further includes a third side portion 32, a fifth side portion 33, and a seventh side portion 34. The first side portion 31, the third side portion 32, the fifth side portion 33, and the seventh side portion 34 extend from the first surface 211 along a first direction Z. The first side portion 31, the third side portion 32, the fifth side portion 33, and the seventh side portion 34 form a cavity for accommodating the electrode assembly 10.

[0100] In some embodiments, the battery 100 further includes a fourth side portion 42, a sixth side portion 43, and an eighth side portion 44. The second side portion 41, the fourth side portion 42, the sixth side portion 43, and the eighth side portion 44 extend from the second surface 221 along a first direction Z toward the first surface 211. The second side portion 41, the fourth side portion 42, the sixth side portion 43, and the eighth side portion 44 form a cavity for accommodating the electrode assembly 10. The side of the second side portion 41 away from the second surface 221 connects with the side of the first side portion 31 away from the first surface 211, forming an encapsulation line at the junction of the first housing member 21 and the second housing member 22. A first portion 23 is used to seal the encapsulation line to improve the encapsulation reliability at the junction of the first housing member 21 and the second housing member 22.

[0101] In some embodiments, the housing 20 further includes a first portion 23. The projection of the first portion 23 along a third direction Y at least partially overlaps with the projection of the electrode assembly 10. The third direction Y is perpendicular to both the first direction Z and the second direction X.

[0102] Please refer to the following: Figure 4 The first housing member 21 is connected to the second housing member 22 to clamp the electrode assembly 10 in the first direction Z. The first part 23 includes a first fold-back portion 231, a second fold-back portion 232, and a first end portion 233. The first fold-back portion 231 is connected to the junction of the first housing member 21 and the second housing member 22, and the first end portion 233 is located at the end of the first part 23 away from the housing 20. The second fold-back portion 232 is connected to the first fold-back portion 231 and the first end portion 233 on both sides, respectively. At least a portion of the second fold-back portion 232 is connected to the first housing member 21 and / or the second housing member 22.

[0103] In some embodiments, along the third direction Y, the projection of the first fold-back portion 231 at least partially overlaps with the projection of the electrode assembly 10, and the projection of the second fold-back portion 232 at least partially overlaps with the projection of the electrode assembly 10.

[0104] In some embodiments, along the second direction X, the first fold-back portion 231 includes a first edge 231a, and the second fold-back portion 232 includes a second edge 232a that is connected to the first edge 231a. Both the first edge 231a and the second edge 232a are away from the first housing member 21.

[0105] The first part 23 is used to improve the sealing reliability at the junction of the first housing member 21 and the second housing member 22, thereby improving the safety of the battery 100. Specifically, in the first part 23, the first fold-back portion 231 is connected to the junction of the first housing member 21 and the second housing member 22 to seal the junction. Furthermore, the first fold-back portion 231 reduces the tensile force generated at the junction of the first housing member 21 and the second housing member 22 when the first part 23 folds back, thereby reducing the risk of electrolyte leakage due to breakage at the junction.

[0106] Please refer to the following: Figure 5 The first part 23 further includes a first region 23a located between the first fold-back portion 231 and the second fold-back portion 232, and a second region 23b located between the second fold-back portion 232 and the first end portion 233. The first part 23 also includes a first connecting portion 23e and a second connecting portion 23f. One side of the first connecting portion 23e is connected to the first fold-back portion 231, and the other side is connected to the junction of the first housing member 21 and the second housing member 22. One side of the second connecting portion 23f is connected to the portion of the first fold-back portion 231 away from the first connecting portion 23e, and the other side is connected to the second fold-back portion 232. The first connecting portion 23e and the second connecting portion 23f are bent in opposite directions so that the first region 23a and the second region 23b fold back in the first direction Z.

[0107] In the first region 23a, the first folded portion 231 is folded back from the first connecting portion 23e toward the first surface 211 along the first direction Z in the third direction Y toward the first side 31. In the second region 23b, the second folded portion 232 is folded back along the first direction Z toward the second surface 221 in the third direction Y toward the second side 41.

[0108] The first fold 231 and the second fold 232 fold back in the first direction Z to form a folded edge area in the first part 23. The shape of this folded edge area is controllable by controlling the overlap relationship between the first region 23a and the second region 23b in the third direction Y. The first region 23a causes the first fold 231 to bend back from the first connecting part 23e along the first direction Z toward the first surface 211, thereby reducing the risk of the first fold 231 bending in different directions and overlapping to form wrinkles, thus reducing the impact of wrinkles on the battery 100. Furthermore, the first fold 231 can also reduce the risk of the side of the first fold 231 away from the junction of the first housing member 21 and the second housing member 22 being pulled by bending, thereby reducing the tensile force generated on the junction of the first housing member 21 and the second housing member 22 when the first part 23 folds back, reducing the risk of electrolyte leakage due to breakage at the junction, and further improving the safety of the battery.

[0109] Please continue reading. Figure 4 and Figure 5 In some embodiments, along the first direction Z, the first portion 23 includes a first side 234 extending along the second direction X, formed by folding back towards the first surface 211. The first side 234 extends along the encapsulation line at the junction of the first housing member 21 and the second housing member 22 to improve the encapsulation reliability at the junction of the first housing member 21 and the second housing member 22. The first portion 23 also includes a second side 235 extending along the second direction X, formed by folding back towards the second surface 221 in the connection portion of the first region 23a and the second region 23b, and a third side 236 located on the opposite side of the second side 235 along the first direction Z and extending along the second direction X in the second region 23b. By controlling the positions of the second side 235 and the third side 236 in the first direction Z, the overlap relationship of the first region 23a and the second region 23b in the third direction Y is controlled, thereby making the shape of the folded edge area controllable.

[0110] In some embodiments, viewed along the third direction Y, the second side 235 is located between the first side 234 and the first surface 211, such that the first fold-back portion 231 is located between the first side 234 and the first surface 211. The third side 236 is located between the first surface 211 and the second surface 221, such that the second fold-back portion 232 is located between the first surface 211 and the second surface 221. This arrangement reduces the risk of the first portion 23 protruding from the first surface 211 and / or the second surface 221 in the first direction Z, thereby controlling the space occupied by the battery 100 in the first direction Z and improving the energy density of the battery 100.

[0111] Please continue reading. Figure 4In some embodiments, the first side 234 is bent in the first direction Z. Specifically, the encapsulation line at the junction of the first housing member 21 and the second housing member 22 is bent along the first direction Z. The first side 234 extends along the encapsulation line at the junction of the first housing member 21 and the second housing member 22 to adapt to the encapsulation line at the junction of the first housing member 21 and the second housing member 22, thereby improving the encapsulation reliability at the junction of the first housing member 21 and the second housing member 22.

[0112] Please see Figure 6 and Figure 11 In some embodiments, the first side 234 and the second side 235 are tangent to each other. At the tangency point 60 between the first side 234 and the second side 235, the second folded portion 232 folds back and bends towards the second surface 221 along the first direction Z to reduce the risk of wrinkles at the tangency point 60. Viewed along the third direction Y, the portion of the first part 23 on the side of the first side 234 facing the first surface 211 forms a double-folded edge structure, and the portion of the first part 23 on the side of the first side 234 facing the second surface 221 forms a single-folded edge structure.

[0113] In some specific implementations, the first side 234 is curved in the first direction Z, and the first side 234 is tangent to the second side 235 at the midpoint of the first side 234 in the second direction X. This midpoint position allows for a tolerance range of 0 to ±5%.

[0114] Please refer to the following: Figure 7 and Figure 8 In some embodiments, along a third direction Y, the first region 23a and the second region 23b at least partially overlap, forming a folded edge region in the first portion 23. The shape of this folded edge region is controllable by controlling the overlap relationship between the first region 23a and the second region 23b. The first region 23a causes the first folded portion 231 to fold back from the first connecting portion 23e along a first direction Z towards the first surface 211, thereby reducing the risk of wrinkles caused by the first folded portion 231 bending in different directions and overlapping, thus reducing the impact of wrinkles on the battery 100. Furthermore, the first region 23a also reduces the risk of the side of the first folded portion 231 away from the junction of the first housing member 21 and the second housing member 22 being pulled by bending, thereby reducing the tensile force generated at the junction of the first housing member 21 and the second housing member 22 when the first portion 23 folds back, reducing the risk of electrolyte leakage due to breakage at the junction, and further improving battery safety.

[0115] Please see Figure 7 , Figure 12 and Figure 14In some embodiments, the first distance L1 between the two ends of the first region 23a is the distance between the first side 234 and the second side 235 in the first direction Z; the second distance L2 between the two ends of the second region 23b is the distance between the second side 235 and the third side 236 in the first direction Z. Along the first direction Z, the first distance L1 between the two ends of the first region 23a and the second distance L2 between the two ends of the second region 23b satisfy the following: the first region 23a includes a portion where the first distance L1 is longer than the second distance L2, which is the third portion 51 of the first fold-back portion 231 away from the second fold-back portion 232. In some embodiments, the third portion 51 is located at both ends of the first region 23a along the second direction X, which facilitates connection with the sealing edges of the battery 100 at both ends along the second direction X, improving the overall packaging reliability of the housing 20.

[0116] It is understandable that, along the first direction Z, the first distance L1 between the two ends of the first region 23a and the second distance L2 between the two ends of the second region 23b satisfy the following: the first region 23a includes a portion where the first distance L1 is shorter than the second distance L2. The first distance L1 in this portion is defined as the third distance L3. This portion is the fourth portion 52 where the first fold 231 and the second fold 232 overlap. The fourth portion 52 forms a folded edge area. By controlling the overlap relationship between the first region 23a and the second region 23b, the shape of this folded edge area can be controlled, thereby reducing the risk of wrinkles in the first portion 23 and thus reducing the impact of wrinkles on the battery 100.

[0117] Please see Figure 8 , Figure 13 and Figure 15 In some embodiments, along the first direction Z, the first distance L1 between the two ends of the first region 23a and the second distance L2 between the two ends of the second region 23b satisfy the following: the first region 23a includes a portion where the first distance L1 is shorter than the second distance L2. This portion is the fourth portion 52 where the first fold 231 and the second fold 232 overlap. The fourth portion 52 forms a folded edge area. By controlling the overlap relationship between the first region 23a and the second region 23b, the shape of the folded edge area is controllable, thereby reducing the risk of wrinkles in the first portion 23 and thus reducing the impact of wrinkles on the battery 100.

[0118] Please refer to it again. Figure 4Specifically, in some embodiments, the relationship between the first distance L1 between the two ends of the first region 23a and the second distance L2 between the two ends of the second region 23b is as follows: along the second direction X, the first distance L1 is first greater than the second distance L2; then the distance difference between the first distance L1 and the second distance L2 gradually decreases until they 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 its minimum value (for example, when the first side 234 and the second side 235 are tangent, the first distance L1 is equal to zero); then the distance difference between the first distance L1 and the second distance L2 gradually decreases until they 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.

[0119] Please refer to it again. Figure 3 In some embodiments, viewed along the third direction Y, the first portion 23 has a third region 23c located between the first surface 211 and the second surface 221 in the second direction X, and a fourth region 23d located outside the first surface 211 and the second surface 221 in the second direction X. The third region 23c is used to connect with the first side portion 31 and the second side portion 41, improving the encapsulation reliability at the connection point of the first side portion 31 and the second side portion 41. The fourth region 23d is used to connect with the sealing edges of the battery 100 at both ends along the second direction X, improving the overall encapsulation reliability of the housing 20.

[0120] In some embodiments, in the third region 23c, along the first direction Z, the first distance L1 between the two ends of the first region 23a and the second distance L2 between the two ends of the second region 23b satisfy the following: the first region 23a includes a portion where the first distance L1 is shorter than the second distance L2. This portion is the fourth portion 52 where the first fold 231 and the second fold 232 overlap. The fourth portion 52 forms a folded edge area. By controlling the overlap relationship between the first region 23a and the second region 23b, the shape of the folded edge area is controllable, thereby reducing the risk of wrinkles in the first portion 23 and thus reducing the impact of wrinkles on the battery 100.

[0121] In some embodiments, in the fourth region 23d, along the first direction Z, the first distance L1 between the two ends of the first region 23a and the second distance L2 between the two ends of the second region 23b satisfy the following condition: the first region 23a includes a portion where the first distance L1 is longer than the second distance L2, which is the third portion 51 of the first fold-back portion 231 that is not covered by the second fold-back portion 232. The third portion 51 facilitates connection with the sealing edge of the battery 100 at one end along the second direction X, improving the overall packaging reliability of the housing 20.

[0122] Please see Figure 9 and Figure 10In some embodiments, the first part 23 is provided with a first layer 237. Specifically, when the first fold-back portion 231 and the second fold-back portion 232 of the first part 23 unfold to the same plane along the third direction Y, the first part 23 is provided with a first layer 237 and a second layer 238 arranged opposite to each other along the first direction Z, the first layer 237 facing the second surface 221 and the second layer 238 facing the first surface 211.

[0123] In some embodiments, when the first fold 231 and the second fold 232 of the first portion 23 are folded back, the first layer 237 along the third direction Y includes a first portion 237a and a second portion 237b. The first portion 237a is located between the first fold 231 and the second fold 232, and the first fold 231 and the second fold 232 are connected and fixed through the first portion 237a to improve the stability of the structure between the first fold 231 and the second fold 232. The second portion 237b is located between the second fold 232 and the second side portion 41, and the second fold 232 and the second side portion 41 are connected and fixed through the second portion 237b to improve the stability of the structure between the second fold 232 and the second fold 232. The second layer 238 is located between the first fold 231 and the first side portion 31, and the first fold 231 and the first side portion 31 are connected and fixed through the second layer 238 to improve the stability of the structure between the first fold 231 and the first side portion 31.

[0124] 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.

[0125] In some embodiments, the battery 100 further includes a second portion 24, wherein the side of the sixth side 43 away from the second surface 221 connects with the side of the fifth side 33 away from the first surface 211 to form an encapsulation line at the junction of the first housing member 21 and the second housing member 22. The second portion 24 is used to seal the encapsulation line to improve the encapsulation reliability at the junction of the first housing member 21 and the second housing member 22. The second portion 24 has the same structure as the first portion 23 and is symmetrically arranged with the first portion 23, which will not be described in detail here.

[0126] Please refer to it again. Figure 1 and Figure 2 In some embodiments, when viewed along the third direction Y, the second surface 221 is bent in a manner that protrudes toward the first surface 211, so that the battery 100 has the same bending tendency in the second direction X, which makes it easier for the battery 100 to fit into a pre-set curved battery compartment in an electronic device and meet the personalized needs of the electronic device.

[0127] Please see Figure 16In some embodiments, when viewed along a third direction Y, the first surface 211 is curved in a manner that protrudes toward the side opposite to the second surface 221, thereby increasing the space in the housing 20 to accommodate the electrode assembly 10 and increasing the energy density of the battery 100.

[0128] Please see Figure 17 In some embodiments, the first side 234 and the second side 235 are tangent to each other. At the tangency point 60 of the first side 234 and the second side 235, the second folded portion 232 folds back and bends along the first direction Z towards the second surface 221 at the tangency point 60 to reduce the risk of wrinkles forming at the tangency point 60. Viewed along the third direction Y, the portion of the first part 23 on the side of the first side 234 facing the first surface 211 forms a double-folded edge structure, and the portion of the first part 23 on the side of the first side 234 facing the second surface 221 forms a single-folded edge structure.

[0129] Please see Figure 18 and Figure 19 In some embodiments, the first side 234 and the second side 235 are spaced apart in the first direction Z. Viewed along the third direction Y, the second side 235 is located between the first side 234 and the first surface 211. The portion 23 of the first side 234 facing the first surface 211 forms a double-folded edge structure, and the portion of the first side 234 facing the second surface 221 forms a single-folded edge structure. By spaced the first side 234 and the second side 235 in the first direction Z, the area of ​​the double-folded edge structure is increased, thereby reducing the space occupied by the second fold portion 232 in the first direction Z and improving the energy density of the battery 100.

[0130] Please see Figure 20 This application embodiment also provides an electrical device 200, including any of the batteries 100 in the above embodiments, the battery 100 being used to supply power to the electrical device 200.

[0131] In the aforementioned battery 100 and electrical device 200, the first portion 23 forms a folded edge area by folding back along the first direction Z using the first fold-back portion 231 and the second fold-back portion 232. Furthermore, the shape of this folded edge area is controllable by controlling the overlap relationship between the first region 23a and the second region 23b in the third direction Y. The first region 23a causes the first fold-back portion 231 to bend back from the first connecting portion 23e along the first direction Z towards the first surface 211, thereby reducing the risk of wrinkles caused by the first fold-back portion 231 bending in different directions and overlapping, thus reducing the impact of wrinkles on the battery 100. Additionally, the first fold-back portion 231 also reduces the risk of the side of the first fold-back portion 231 away from the junction of the first housing member 21 and the second housing member 22 being pulled by bending, thereby reducing the tensile force generated at the junction of the first housing member 21 and the second housing member 22 when the first portion 23 is folded back, reducing the risk of electrolyte leakage due to breakage at this junction, and further improving battery safety.

[0132] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A battery comprising an electrode assembly and a first conductive plate connected to the electrode assembly, and a housing covering at least a portion of the first conductive plate, characterized in that, The housing includes a first housing component and a second housing component, the first housing component being connected to the second housing component. The first housing component includes a first surface curved along a first direction, and the second housing component includes a second surface spaced apart from the first surface along the first direction. The second surface is curved along the first direction and together with the first surface clamps the electrode assembly. Both the first surface and the second surface extend their length along a second direction, the first direction being perpendicular to the second direction. The housing further includes a first portion, which, along a third direction, at least partially overlaps with the projection of the electrode assembly. This third direction is perpendicular to both the first and second directions. The first part includes a first fold-back portion, a second fold-back portion, and a first end portion. The first fold-back portion is connected to the junction of the first housing member and the second housing member. The first end portion is located at the end of the first part away from the housing. The second fold-back portion is connected to the first fold-back portion and the first end portion on both sides, respectively. Viewed along the third direction, the battery further includes a first side portion connected to the first surface and the first portion, and a second side portion connected to the second surface and the first portion. The first part further includes a first region located between the first fold-back portion and the second fold-back portion and facing the first side portion upwards from the third party, and a second region located between the second fold-back portion and the first end portion and facing the second side portion upwards from the third party; The second folded portion extends beyond the first folded portion in the first direction. Along the third direction, the first folded portion is located between the second folded portion and the first side portion. The projection of the second folded portion on the second side portion does not overlap with the first folded portion, and the projection of the second folded portion on the first side portion at least partially overlaps with the first folded portion. Along the first direction, the first portion includes a first side extending along the second direction, formed by folding back towards one side of the first surface; a second side extending along the second direction, formed by folding back towards one side of the second surface in the first region; and a third side located on the opposite side of the second side and extending along the second direction in the second region, wherein the first side and the second side are tangent to each other.

2. The battery as described in claim 1, characterized in that, The first side is bent in the first direction.

3. The battery as described in claim 1, characterized in that, Viewed along the third direction, the first portion has a third region located between the first surface and the second surface in the second direction, and a fourth region located outside the first surface and the second surface in the second direction.

4. The battery as described in claim 1, characterized in that, Along the third direction, the first region and the second region at least partially overlap.

5. The battery as described in claim 1, characterized in that, The first part has a first layer, and the first area and the second area are connected through the first layer.

6. The battery as claimed in claim 1, characterized in that, Viewed along the third direction, the first surface is curved in a manner that bulges out toward the side opposite to the second surface.

7. The battery as described in claim 6, characterized in that, Viewed along the third direction, the second surface is curved in a manner that bulges toward one side of the first surface.

8. The battery as claimed in claim 1, characterized in that, Along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following condition: the first region includes a portion where the first distance is longer than the second distance.

9. The battery as claimed in claim 1, characterized in that, Along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following condition: the first region includes a portion where the first distance is shorter than the second distance.

10. The battery as claimed in claim 3, characterized in that, In the third region, along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following condition: the first region includes a portion where the first distance is shorter than the second distance.

11. The battery as claimed in claim 3, characterized in that, In the fourth region, along the first direction, the first distance between the two ends of the first region and the second distance between the two ends of the second region satisfy the following condition: the first region includes a portion where the first distance is longer than the second distance.

12. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1 to 11.

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