Battery and terminal device

Abstract

A battery and a terminal device, the battery comprising two battery cells and a circuit board assembly. The battery cell comprises a main body, an encapsulation and a tab. The encapsulation comprises a top wall and a side wall. The top wall comprises a root and a first top surface between the root and a first wall, the tab extends from a bending portion of the top wall towards the first top surface. The side wall bends towards the first wall, and comprises a side wall extension protruding from the top wall in a third direction, the side wall extension is connected to the bending portion. The circuit board assembly comprises a substrate, the substrate comprises a first portion and two second portions. The first portion is located on a side of the two side wall extensions close to the first wall, and the first portion is arranged opposite to the first top surface in the third direction. The two second portions are connected to two ends of the first portion respectively, and each second portion is connected to a corresponding tab. In the battery, the first portion is used to avoid the two side wall extensions, which is conducive to increasing the volume of the main body to improve the capacity of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to a battery and a terminal device. BACKGROUND

[0002] Double cells can improve charging speed and reduce temperature rise, and are widely used in high-end mobile phones. With the continuous improvement of the performance of the whole machine and the application of AI, the power consumption of mobile phones is increasing, and the demand for improving the capacity of double cells is more urgent. The capacity loss of existing double cells compared to single cells is as high as more than 6%. The existing cells are usually top-fold sealed cells, and a single top-fold sealed cell has two side sealing edge protruding parts protruding from the top wall. When using a double cell scheme, the protruding parts of the two adjacent side sealing edges will interfere with the protection plate, and the protection plate cannot be effectively placed. SUMMARY

[0003] In view of the above situation, the present application provides a battery to solve the above problems.

[0004] An embodiment of the present application provides a battery, which includes two cells and a circuit board assembly. The thickness direction of the two cells is a first direction. The two cells are arranged along a second direction as viewed along the first direction. The cell includes a main body part, a packaging part and a tab. The main body part includes a top wall, a first wall and a second wall connected to the top wall along the first direction, and two side walls connected to the top wall along the second direction. The packaging part includes a top sealing part connected to the top wall and a side sealing part connected to the side wall. The top sealing part includes a bending part and a root part connected between the bending part and the top wall. The top wall includes a first top surface between the root part and the first wall, the bending part is bent towards the first top surface, and the tab protrudes from the bending part. The side sealing part is bent in a direction towards the first wall, and the side sealing part includes a side sealing extension part protruding from the top wall along a third direction, and the side sealing extension part is connected to the bending part. The first direction, the second direction and the third direction are perpendicular to each other. The circuit board assembly includes a substrate, and the thickness direction of the substrate intersects the first direction. The substrate includes a first part and two second parts. Along the first direction, the first part is located on one side of the two adjacent side sealing extension parts close to the first wall, and the first part is arranged opposite to the first top surface along the third direction. Along the second direction, the two second parts are respectively connected to the two ends of the first part, and each second part is arranged opposite to the bending part of one cell along the third direction and connected to the corresponding tab.

[0005] The substrate includes a first portion and two second portions. In the first direction, the first portion is located on one side of the two adjacent side seal extension portions close to the first wall, and the first portion is arranged opposite the first top surface in the third direction to avoid the two side seal extension portions. In the second direction, the two second portions are respectively connected to the two ends of the first portion, and each second portion is arranged opposite the bending portion of one battery cell in the third direction and connected to the corresponding tab. The substrate and the side seal extension portion share the space in the third direction on the top wall, which can reduce the space occupied by the substrate in the third direction, and is beneficial to increase the volume of the main body portion to improve the capacity of the battery.

[0006] In some embodiments of the present application, the bending portion includes a first bending segment and a second bending segment connected to the two ends of the first bending segment in the second direction. The first bending segment is arranged opposite the second portion in the third direction, and the second bending segment extends from the first bending segment in the third direction away from the top wall. The second bending segment is connected between the first bending segment and the side seal extension portion. In the first direction, the first portion is arranged opposite the two adjacent second bending segments. In the first direction, the distance between the first bending segment and the first wall is D1, and the distance between the two adjacent side seal extension portions and the first wall is D2, D1 < D2, 0.15mm ≤ D2-D1 ≤ 0.25mm, to reduce the risk of interference between the side seal extension portion and the first portion, and to improve the packaging strength of the side seal extension portion.

[0007] In some embodiments of the present application, in the first direction, the width of the first portion is W1, 1mm ≤ W1 ≤ 4mm, D2 ≥ W1, 1.5mm ≤ D2 ≤ 4.5mm, which is beneficial to improve the structural strength and overcurrent capacity of the first portion, reduce the temperature rise of the first portion during use of the substrate, and improve the space utilization of the first portion on the top wall. In the second direction, the length of the first portion is L1, 3mm ≤ L1 ≤ 12mm, to reduce the risk of interference between the second portion and the convex corner structure, and to facilitate increasing the layout area of the second portion.

[0008] In some embodiments of the present application, the side seal extension portion close to the side edge of the first wall is provided with a first notch, and part of the first portion is located in the first notch, to reduce the risk of interference between the side seal extension portion and the first portion.

[0009] In some embodiments of the present application, the first notch has a first edge and a second edge, the first edge extends in the third direction and is arranged opposite the first portion in the first direction, and the second edge extends in the first direction and is arranged opposite the first portion in the third direction. The length of the first edge is L2, 1mm ≤ L2 ≤ 5mm, to reduce the risk of interference between the second edge and the first portion, and to improve the packaging strength of the side seal extension portion. The length of the second edge is L3, 0.5mm ≤ L3 ≤ 3.5mm, to reduce the risk of interference between the first edge and the first portion, and to improve the packaging strength of the side seal extension portion.

[0010] In some embodiments of the present application, the first edge is spaced apart from the side seal extension by a distance D3 in the first direction, and 1.5 mm≤D3≤4.5 mm, so as to reduce the risk of interference between the first edge and the first portion and to improve the sealing strength of the side seal extension.

[0011] In some embodiments of the present application, the circuit board assembly includes a first electronic component disposed on the surface of the second portion close to the bending portion. The bending portion includes a first bending segment and a second bending segment connected to both ends of the first bending segment in the second direction. The first bending segment is oppositely arranged with the second portion in the third direction, and the second bending segment extends from the first bending segment in the third direction away from the top wall. The second bending segment is connected between the first bending segment and the side seal extension, and the first portion is oppositely arranged with two adjacent second bending segments in the first direction. The first electronic component is disposed on the surface of the second portion close to the bending portion, so as to increase the distance between the substrate and the top wall in the third direction, so that the substrate avoids the part with large volume of the second bending segment, thereby reducing the risk of interference between the second bending segment and the substrate.

[0012] In some embodiments of the present application, the bending portion includes a first side edge away from the root portion, and the first side edge is provided with a second notch. The second notch is close to two adjacent side seal extensions in the second direction. The second notch has a third edge and a fourth edge, the third edge extends in the first direction and is oppositely arranged with the first portion in the third direction, and the fourth edge extends from the third edge in the direction away from the top wall in the first direction. The first portion is oppositely arranged with two adjacent fourth edges in the first direction. By providing the second notch, the space occupied by the second bending segment in the first direction is reduced, thereby reducing the risk of interference between the second bending segment and the substrate.

[0013] In some embodiments of the present application, the top wall includes a second top surface between the root portion and the second wall. The battery includes a first insulating member including a first insulating portion, a second insulating portion, and a third insulating portion. The first insulating portion is arranged on one side of the two adjacent side seal extensions away from the top wall in the third direction, and the second insulating portion and the third insulating portion are connected to both sides of the first insulating portion in the first direction. The first insulating portion covers the part where the packaging portion is located between the two second portions in the third direction. The second insulating portion covers the gap between the two first top surfaces and the part where the packaging portion is located between the two second portions in the first direction, and the third insulating portion covers the gap between the two second top surfaces and the part where the packaging portion is located between the two second portions. The first insulating member can improve the insulation stability between the part where the packaging portion is located between the two second portions and other structural members. The battery includes an injection member connected to the first insulating member and the area of the top wall away from the first insulating member, and the injection member covers the top seal portion, the tab, and the substrate. The first insulating member can reduce the risk of injection material penetrating into the gap between the two battery cells during the injection process.

[0014] In some embodiments of the present application, the thickness direction of the substrate is parallel to the third direction. The second part includes a first surface, a second surface, a third surface and a fourth surface. The first surface and the second surface are oppositely arranged along the third direction, and the first surface is close to the top wall and the second surface is away from the top wall. The third surface and the fourth surface are oppositely arranged along the first direction, and the third surface is close to the first wall and the fourth surface is close to the second wall. The circuit board assembly includes a first connecting piece, the first connecting piece is connected to the second part, the first connecting piece is connected with the tab and forms a combination part, and the combination part is located on the third surface. The combination part shares the space in the third direction with the substrate, which is beneficial to improve the space utilization of the circuit board assembly 20 on the top wall.

[0015] In some embodiments of the present application, the third surface includes a first body surface, a first concave surface and a first connecting surface. Along the second direction, the first body surface overlaps with the first part, and the first concave surface is located on the side of the first body surface away from the first part. Along the first direction, the distance between the first body surface and the first wall is D5, the distance between the first concave surface and the first wall is D6, D5 < D6, and 0.2mm ≤ D6-D5 ≤ 0.8mm. The first connecting surface is connected between the first body surface and the first concave surface. Along the first direction, the combination part is located on the first concave surface, and along the second direction, the combination part overlaps with the first connecting surface. The combination part shares the space in the first direction and the second direction with the substrate, which is beneficial to improve the space utilization of the circuit board assembly on the top wall. By limiting 0.2mm ≤ D6-D5 ≤ 0.8mm, the combination part utilizes the accommodation space formed by the first concave surface and the first connecting surface, and the influence on the layout area of the second part is reduced.

[0016] In some embodiments of the present application, the first connecting piece includes a first segment, a second segment and a third segment. The first segment is connected to the first surface, the third segment is spaced apart from the third surface along the first direction, and the second segment is bent and connected between the first segment and the third segment. The tab includes a first extension segment, a second extension segment, a third extension segment and a fourth extension segment connected in sequence. The first extension segment extends from the bending part, the second extension segment is located on the side of the third segment away from the third surface along the first direction, the third extension segment is located on the side of the third segment away from the first top surface along the third direction, and the fourth extension segment is located between the third segment and the third surface along the first direction and is connected to the third segment. The fourth extension segment is connected with the third segment to form a combination part, which is beneficial to improve the stability of the connection between the first connecting piece and the tab.

[0017] In some embodiments of the present application, the first connecting piece comprises a first segment, a second segment, a third segment, a fourth segment and a fifth segment. The first segment is connected to the first surface, the third segment is spaced apart from the third surface along the first direction, the second segment is connected between the first segment and the third segment, the fifth segment is located on a side of the third segment away from the third surface along the first direction, and the fourth segment is connected between the third segment and the fifth segment. The tab comprises a first extension segment, a second extension segment, a third extension segment and a fourth extension segment connected in sequence. The first extension segment extends from the bending portion, the second extension segment is connected to the fifth segment and located on a side of the fifth segment away from the third segment along the first direction, the third extension segment is located on a side of the fourth segment away from the first top surface along the third direction, and the fourth extension segment is connected to the third segment and located between the third segment and the third surface along the first direction. The fourth extension segment and the third segment and the second extension segment and the fifth segment form a joint, which is beneficial to improve the stability of the connection between the first connecting piece and the tab.

[0018] In some embodiments of the present application, the fourth segment comprises a first sub-portion and a second sub-portion spaced apart along the second direction, and a gap is provided between the first sub-portion and the second sub-portion to facilitate the bending of the fourth segment.

[0019] In some embodiments of the present application, the fourth surface is provided with a third gap along the third direction, and the injection molding part is filled in the third gap to facilitate the penetration of the injection molding material into the area between the top wall and the first insulating part during the injection molding process.

[0020] Embodiments of the present application also provide a terminal device, which comprises the battery of any one of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a battery in an embodiment of the present application.

[0022] Figure 2 FIG. 2 is a structural schematic diagram of the connection between the battery cell and the circuit board assembly in an embodiment of the present application.

[0023] Figure 3 FIG. 3 is a structural schematic diagram of the separation between the battery cell and the circuit board assembly in an embodiment of the present application.

[0024] Figure 4 FIG. 4 is a structural schematic diagram of the first insulating part and the first top surface in an embodiment of the present application. Figure 2 FIG. 5 is a partial sectional view along the section line IV-IV.

[0025] Figure 5 FIG. 6 is a structural schematic diagram of the first insulating part and the second top surface in an embodiment of the present application.

[0026] Figure 6 FIG. 7 is a structural schematic diagram of the first insulating part and the second top surface in an embodiment of the present application. FIG. 8 is a structural schematic diagram of the first insulating part and the second top surface in an embodiment of the present application.

[0027] Figure 7 is Figure 5 Partial sectional view along section line VII-VII.

[0028] Figure 8 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0029] Figure 9 is Figure 8 is a partial enlarged view of region IX in FIG. 7.

[0030] Figure 10 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0031] Figure 11 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0032] Figure 12 is Figure 11 Partial sectional view along section line XII-XII.

[0033] Figure 13 is a structural schematic diagram of a first connecting member of a battery in an embodiment of the present application.

[0034] Figure 14 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0035] Figure 15 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0036] Figure 16 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0037] Figure 17 is Figure 16 Partial sectional view along section line XVII-XVII.

[0038] Figure 18 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0039] Figure 19 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0040] Figure 20 is a disassembled structural schematic diagram of a battery in an embodiment of the present application.

[0041] Figure 21 is Figure 20 Partial sectional view along section line XXI-XXI.

[0042] Figure 22is a disassembled structure schematic diagram of a battery in one embodiment of the present application.

[0043] Figure 23 is a disassembled structure schematic diagram of a battery in one embodiment of the present application.

[0044] Figure 24 is a structure schematic diagram of a terminal device in another embodiment of the present application.

[0045] Main element symbol explanation

[0046] Battery 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K, 100L

[0047] Terminal device 200A, 200B

[0048] Battery cell 10

[0049] Main body part 11

[0050] Top wall 111

[0051] First top surface 111A

[0052] Second top surface 111B

[0053] First wall 112

[0054] Second wall 113

[0055] Side wall 114

[0056] Packaging part 12

[0057] Top sealing part 121

[0058] Bent part 121A

[0059] First bent segment 1211

[0060] Second bent segment 1212

[0061] Second notch 1213

[0062] Third edge 1214

[0063] Fourth edge 1215

[0064] Root part 121B

[0065] First side edge 121C

[0066] Side sealing part 122

[0067] Side sealing extension part 122A

[0068] First notch 1221

[0069] First edge 1222

[0070] Second edge 1223

[0071] Side seal body portion 122B

[0072] Tab 13

[0073] First extension section 131

[0074] Second extension section 132

[0075] Third extension section 133

[0076] Fourth extension section 134

[0077] Circuit board assembly 20

[0078] Substrate 21

[0079] First portion 211

[0080] Second portion 212

[0081] First surface 212A

[0082] Second surface 212B

[0083] Third surface 212C

[0084] First body surface 2121

[0085] First concave surface 2122

[0086] First connecting surface 2123

[0087] Fourth surface 212D

[0088] Third notch 2124

[0089] First connector 22

[0090] Joint portion 22A

[0091] First section 221

[0092] Second section 222

[0093] Third section 223

[0094] Fourth section 224

[0095] First sub-portion 224A

[0096] Second sub-portion 224B

[0097] Gap 224C

[0098] Paragraph 5, 225

[0099] Flexible circuit board 23

[0100] First insulating component 31

[0101] First insulating part 311

[0102] Second insulating part 312

[0103] Third Insulation Section 313

[0104] Injection molded part 40

[0105] Recess 41

[0106] First direction X

[0107] Second direction Y

[0108] Third direction Z

[0109] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0110] 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.

[0111] 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 there may be components positioned in between. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be components positioned in between. It should be understood that, considering the factors of actual machining tolerances, in the technical solution of this application, when two components are set parallel / perpendicularly, they are set in the same direction, and there may be a certain angle between the two components. The angle between the two components is allowed to have a tolerance of 0-±10%.

[0112] When one value is considered "equal" to another, it means that they are equal within a set deviation range, which is within 10%. In other words, if at least one of the two values ​​fluctuates within the set deviation range, they are considered approximately equal even if their values ​​are not equal. Similarly, when one value is considered to have a "1:1" ratio with another, it means that they are equal within a set deviation range, which is within 10%. Again, if at least one of the two values ​​fluctuates within the set deviation range, they are considered equal in ratio even if their values ​​are not equal.

[0113] 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 in the description herein is for 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. As used herein, the term "overlap" means that the projected portions of two components overlap or the projections of two components coincide.

[0114] An embodiment of the application provides a battery, which includes two battery cells and a circuit board assembly. The thickness direction of the two battery cells is a first direction. The two battery cells are arranged along a second direction as viewed along the first direction. The battery cell includes a main body portion, a packaging portion, and a tab. The main body portion includes a top wall, a first wall and a second wall connected to the top wall along the first direction, and two side walls connected to the top wall along the second direction. The packaging portion includes a top packaging portion connected to the top wall and a side packaging portion connected to the side wall. The top packaging portion includes a bending portion and a root portion connected between the bending portion and the top wall. The top wall includes a first top surface between the root portion and the first wall, the bending portion is bent towards the first top surface, and the tab extends from the bending portion. The side packaging portion is bent in a direction towards the first wall, and the side packaging portion includes a side packaging extension portion protruding out of the top wall along a third direction, and the side packaging extension portion is connected to the bending portion. The first direction, the second direction, and the third direction are perpendicular to each other. The circuit board assembly includes a substrate, and the thickness direction of the substrate intersects the first direction. The substrate includes a first portion and two second portions. Along the first direction, the first portion is located on a side of the two adjacent side packaging extension portions close to the first wall, and the first portion is arranged opposite to the first top surface along the third direction. Along the second direction, the two second portions are respectively connected to two ends of the first portion, and each second portion is arranged opposite to the bending portion of one battery cell along the third direction and connected to the corresponding tab.

[0115] In the above battery, the substrate includes a first portion and two second portions. Along the first direction, the first portion is located on a side of the two adjacent side packaging extension portions close to the first wall, and the first portion is arranged opposite to the first top surface along the third direction to avoid the two side packaging extension portions. Along the second direction, the two second portions are respectively connected to two ends of the first portion, and each second portion is arranged opposite to the bending portion of one battery cell along the third direction and connected to the corresponding tab. The substrate shares the space in the third direction with the side packaging extension portion, which can reduce the space occupied by the substrate in the third direction, and is beneficial to increase the volume of the main body portion to improve the capacity of the battery.

[0116] The embodiments of the application will be further described in conjunction with the accompanying drawings.

[0117] Embodiment 1

[0118] Please refer to Figure 1 and Figure 2An embodiment of the present application provides a battery 100A. The battery 100A can be, but is not limited to, a secondary battery, which refers to a battery that can be used continuously by activating active materials through charging after discharging.

[0119] The battery 100A includes two battery cells 10 and a circuit board assembly 20. The thickness direction of the two battery cells 10 is a first direction X, and the two battery cells 10 are arranged along a second direction Y as viewed along the first direction X, and the circuit board assembly 20 is arranged along a third direction Z on one side of the two battery cells 10. Among them, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, the second direction Y is the width direction of the battery cell 10, and the third direction Z is the length direction of the battery cell 10.

[0120] Please refer to Figure 2 and Figure 3 together, the battery cell 10 includes a main body part 11, an encapsulation part 12 and a tab 13. The main body part 11 and the encapsulation part 12 are made of an encapsulation film by punching, folding and heat sealing, the main body part 11 is the part of the encapsulation film provided with the punching position, and the encapsulation part 12 is the part of the encapsulation film overlapping and jointing.

[0121] The main body part 11 includes a top wall 111, a first wall 112, a second wall 113 and two side walls 114. The top wall 111 is arranged adjacent to the circuit board assembly 20. The first wall 112 and the second wall 113 are arranged opposite along the first direction X and connected to the top wall 111, and the two side walls 114 are arranged opposite along the second direction Y and connected to the top wall 111.

[0122] The encapsulation part 12 includes a top encapsulation part 121 and two side encapsulation parts 122, the top encapsulation part 121 is connected to the top wall 111, and each side encapsulation part 122 is connected to one side wall 114.

[0123] The top encapsulation part 121 includes a bending part 121A and a root part 121B connected between the bending part 121A and the top wall 111. The top wall 111 includes a first top surface 111A between the root part 121B and the first wall 112. The bending part 121A is bent towards the first top surface 111A to reduce the space occupied by the top encapsulation part 121 in the third direction Z. Specifically, the bending part 121A includes a first bending segment 1211 and a second bending segment 1212 connected to both ends of the first bending segment 1211 along the second direction Y. The first bending segment 1211 is arranged opposite to the first top surface 111A along the third direction Z, and the second bending segment 1212 extends from the first bending segment 1211 along the third direction Z away from the top wall 111.

[0124] The tab 13 extends from the bending part 121A to facilitate electrical connection with the circuit board assembly 20. Specifically, the tab 13 extends from the side of the first bending segment 1211 away from the root part 121B.

[0125] The side seal portion 122 is bent in a direction towards the first wall 112, and the side seal portion 122 comprises a side seal extension 122A protruding out of the top wall 111 in the third direction Z, and the side seal extension 122A is connected to the bent portion 121A. Specifically, a second bent segment 1212 is connected between the first bent segment 1211 and the side seal extension 122A, and the second bent segment 1212 is bent relative to the first bent segment 1211 and forms a convex corner structure with the side seal extension 122A.

[0126] Please refer to Figure 2 and Figure 3 The circuit board assembly 20 comprises a substrate 21, and a thickness direction of the substrate 21 is perpendicular to the first direction X, so as to reduce a space occupied by the substrate 21 in the third direction Z. Optionally, the thickness direction of the substrate 21 is parallel to the third direction Z, i.e., the substrate 21 is arranged parallel to the top wall 111; or viewed in the second direction Y, the thickness direction of the substrate 21 is arranged obliquely relative to the first direction X and the second direction Y. It should be noted that the substrate 21 is described as being parallel to the third direction Z in the present application.

[0127] The substrate 21 comprises a first portion 211 and two second portions 212. In the first direction X, the first portion 211 is located on a side of the two adjacent side seal extensions 122A close to the first wall 112, and the first portion 211 is arranged opposite to the first top surface 111A in the third direction Z so as to avoid the two side seal extensions 122A. In the second direction Y, the two second portions 212 are respectively connected to two ends of the first portion 211, and each second portion 212 is arranged opposite to the bent portion 121A of one battery cell 10 in the third direction Z and is connected to the corresponding tab 13, so as to increase a layout area of the substrate 21. The substrate 21 shares the space in the third direction Z with the side seal extension 122A, which can reduce the space occupied by the substrate 21 in the third direction Z, and is conducive to increasing the volume of the main body portion 11 to improve the capacity of the battery 100A.

[0128] Please refer to Figure 2 and Figure 3 In some embodiments, in the second direction Y, the second portion 212 overlaps with the two adjacent side seal extensions 122A. In the third direction Z, the first portion 211 forms an avoiding groove on the substrate 21 between the two second portions 212, so as to avoid the two adjacent side seal extensions 122A and the convex corner structure formed by the side seal extension 122A and the bent portion 121A, and then the substrate 21 can be placed on the top wall 111 of the two battery cells 10.

[0129] Please refer to Figure 3 and Figure 4In some embodiments, the first bent section 1211 is opposite to the second portion 212 along the third direction Z. Along the first direction X, the first portion 211 is opposite to the two adjacent second bent sections 1212, so as to reduce the risk of interference between the first portion 211 and the convex corner structure.

[0130] In some embodiments, along the first direction X, the distance between the first bent section 1211 and the first wall 112 is D1, and the distance between the two adjacent side seal extensions 122A and the first wall 112 is D2, D1 < D2, so as to reduce the risk of interference between the side seal extensions 122A and the first portion 211, and facilitate increasing the size of the first portion 211 along the first direction X, which is conducive to improving the structural strength and flow capacity of the first portion 211.

[0131] It should be noted that D1 is measured by selecting a plurality of measurement points on the side of the first bent section 1211 away from the root 121B, measuring the distance value between each measurement point and the first wall 112 along the first direction X, and taking the average of the plurality of distance values as D1. D2 is measured by selecting a plurality of measurement points on the side of the side seal extension 122A close to the first wall 112, taking the one of the two adjacent side seal extensions 122A closer to the first wall 112 as the measurement target, measuring the distance value between each measurement point and the first wall 112 along the first direction X, and taking the average of the plurality of distance values as D2.

[0132] Please continue to refer to Figure 3 and Figure 4 In some embodiments, 0.15mm ≤ D2-D1 ≤ 0.25mm. When D2-D1 is too small (less than 0.15mm), it is easy to cause interference between the side seal extensions 122A and the first portion 211; when D2-D1 is too large (greater than 0.25mm), the side seal extensions 122A will lose a large packaging area, which will reduce the packaging strength. By limiting 0.15mm ≤ D2-D1 ≤ 0.25mm, the risk of interference between the side seal extensions 122A and the first portion 211 is reduced, and the packaging strength of the side seal extensions 122A is improved.

[0133] Optionally, D2-D1 is one of 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm and any other value within the range of 0.15mm ≤ D2-D1 ≤ 0.25mm.

[0134] In some embodiments, the circuit board assembly 20 comprises a first electronic element (not shown in the figure), which is configured to form a protection circuit for the battery cell 10. In the third direction Z, the width of the second bent section 1212 in the first direction X gradually decreases, i.e., the space occupied by the second bent section 1212 in the first direction X decreases as it moves away from the top wall 111. The first electronic element is arranged on the surface of the second part 212 close to the bent section 121A, so as to increase the spacing between the substrate 21 and the top wall 111 in the third direction Z, so as to avoid the second bent section 1212 from interfering with the substrate 21, thereby reducing the risk of interference between the second bent section 1212 and the substrate 21.

[0135] Please continue to refer to Figure 3 In some embodiments, in the first direction X, the width of the first part 211 is W1, 1mm≤W1≤4mm, and D2≥W1, 1.5mm≤D2≤4.5mm. When W1 is too small (less than 1mm), it is easy to make the structural strength and overcurrent capacity of the first part 211 weak, and the temperature rise of the first part 211 is easy to increase in the use process of the substrate 21; when W1 is too large (greater than 4mm or greater than D2), it is easy to make the first part 211 protrude out of the first wall 112 in the first direction X, resulting in a waste of space. By limiting 1mm≤W1≤4mm and D2≥W1, it is beneficial to improve the structural strength and overcurrent capacity of the first part 211, reduce the temperature rise of the first part 211 in the use process of the substrate 21, and improve the space utilization of the first part 211 on the top wall 111.

[0136] Optionally, W1 is one of 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm and other arbitrary values within the range of 1mm≤W1≤4mm. D2 is one of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and other arbitrary values within the range of 1.5mm≤D2≤4.5mm.

[0137] Please continue to refer to Figure 3 In some embodiments, in the second direction Y, the length of the first part 211 is L1, 3mm≤L1≤12mm. When L1 is too small (less than 3mm), it is easy to make the second part 212 interfere with the convex corner structure; when L1 is too large (greater than 12mm), it is easy to reduce the layout area of the second part 212. By limiting 3mm≤L1≤12mm, the risk of interference between the second part 212 and the convex corner structure is reduced, and the layout area of the second part 212 is increased.

[0138] Optionally, L1 is one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm and any other value within the range of 3mm≤L1≤12mm.

[0139] Please refer to Figure 4 In some embodiments, the height of the side seal extension 122A along the third direction Z is H1, and H1≥1.5mm, so as to improve the packaging strength of the side seal extension 122A.

[0140] Optionally, H1 is one of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm and any other value within the range of H1≥1.5mm.

[0141] Please refer to Figure 3 and Figure 4 In some embodiments, the side seal extension 122A is cut to form a gap so as to avoid the first part 211. Specifically, the side seal extension 122A is provided with a first gap 1221 near the side edge of the first wall 112, and part of the first part 211 is located in the first gap 1221, so as to reduce the risk of interference between the side seal extension 122A and the first part 211.

[0142] The first gap 1221 has a first edge 1222 and a second edge 1223. The first edge 1222 extends along the third direction Z and is opposite to the first part 211 along the first direction X. The second edge 1223 extends along the first direction X and is opposite to the first part 211 along the third direction Z.

[0143] The length of the first edge 1222 is L2, and 1mm≤L2≤5mm. When L2 is too small (less than 1mm), it is easy to cause interference between the second edge 1223 and the first part 211. When L2 is too large (greater than 5mm), the packaging area of the side seal extension 122A is easily lost, which reduces the packaging strength. By limiting 1mm≤L2≤5mm, the risk of interference between the second edge 1223 and the first part 211 is reduced, and the packaging strength of the side seal extension 122A is improved.

[0144] Optionally, L2 is one of 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm and any other value within the range of 1mm≤L2≤5mm.

[0145] Further, L2=H1, so as to further reduce the risk of interference between the second edge 1223 and the first part 211.

[0146] Please refer to Figure 4, the length of the second edge 1223 is L3, and 0.5 mm≤L3≤3.5 mm. When L3 is too small (less than 0.5 mm), the first edge 1222 is likely to interfere with the first part 211. When L3 is too large (greater than 3.5 mm), the side sealing extension 122A is likely to lose a large packaging area, thereby reducing the packaging strength. By limiting 0.5 mm≤L3≤3.5 mm, the risk of interference between the first edge 1222 and the first part 211 is reduced, and the packaging strength of the side sealing extension 122A is improved.

[0147] Optionally, L3 is one of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, and any other value within the range of 0.5 mm≤L3≤3.5 mm.

[0148] For further reference, please see Figure 4 In some embodiments, along the first direction X, the distance between the first edge 1222 and the side of the side sealing extension 122A away from the first wall 112 is D3, and 1.5 mm≤D3≤4.5 mm. When D3 is too small (less than 1.5 mm), the side sealing extension 122A is likely to lose a large packaging area, thereby reducing the packaging strength. When D3 is too large (greater than 4.5 mm), the first edge 1222 is likely to interfere with the first part 211. By limiting 1.5 mm≤D3≤4.5 mm, the risk of interference between the first edge 1222 and the first part 211 is reduced, and the packaging strength of the side sealing extension 122A is improved.

[0149] Optionally, D3 is one of 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, and any other value within the range of 1.5 mm≤D3≤4.5 mm.

[0150] For further reference, please see Figure 5 and Figure 6 In some embodiments, the top wall 111 includes a second top surface 111B between the root 121B and the second wall 113. Optionally, the first top surface 111A is a deep pit surface of the battery 100A, and the second top surface 111B is a shallow pit surface of the battery 100A.

[0151] The battery 100A comprises a first insulating piece 31. The first insulating piece 31 comprises a first insulating portion 311, a second insulating portion 312, and a third insulating portion 313. The first insulating portion 311 is arranged on one side of the two adjacent side seal extension portions 122A away from the top wall 111 in the third direction Z, and the second insulating portion 312 and the third insulating portion 313 are connected to the two sides of the first insulating portion 311 in the first direction X. The first insulating portion 311 covers the part of the packaging portion 12 between the two second portions 212 as viewed in the third direction Z. The second insulating portion 312 covers the gap between the two first top surfaces 111A and the part of the packaging portion 12 between the two second portions 212 as viewed in the first direction X, and the third insulating portion 313 covers the gap between the two second top surfaces 111B and the part of the packaging portion 12 between the two second portions 212 as viewed in the first direction X. The first insulating piece 31 can improve the insulation stability between the part of the packaging portion 12 between the two second portions 212 and other structural pieces.

[0152] Optionally, the first insulating piece 30 is a DuPont paper.

[0153] In some embodiments, the battery 100A comprises an injection molding piece 40 connected to the first insulating piece 30 and the area of the top wall 111 away from the first insulating piece 30, and the injection molding piece 40 covers the top seal portion 121, the tab 13, and the substrate 21. Specifically, the injection molding piece 40 is formed in the set area by melting and solidifying the injection molding material through the injection molding equipment. The first insulating piece 30 can reduce the risk of the injection molding material penetrating into the gap between the two battery cells 10 during the injection molding process.

[0154] Please refer to Figure 5 and Figure 7 In some embodiments, the battery 100A comprises a second insulating piece 32 bonded between the first top surface 111A and the bent portion 121A to improve the structural stability of the top seal portion 121 on the top wall 111.

[0155] Optionally, the second insulating piece 32 is a glue layer.

[0156] Please refer to Figure 5 and Figure 7 In some embodiments, the battery 100A comprises a third insulating piece 33 bonded to the second top surface 111B and the side of the bent portion 121A away from the first top surface 111A. The third insulating piece 33 is located between the bent portion 121A and the substrate 21 to improve the insulation stability between the top seal portion 121 and the substrate 21.

[0157] Optionally, the third insulating piece 33 is a DuPont paper.

[0158] Please refer to Figure 5 and Figure 6In some embodiments, the thickness direction of the substrate 21 is parallel to the third direction Z. The second portion 212 includes a first surface 212A, a second surface 212B, a third surface 212C and a fourth surface 212D. The first surface 212A and the second surface 212B are oppositely arranged along the third direction Z, and the first surface 212A is close to the top wall 111, and the second surface 212B is away from the top wall 111. The third surface 212C and the fourth surface 212D are oppositely arranged along the first direction X, and the third surface 212C is close to the first wall 112, and the fourth surface 212D is close to the second wall 113.

[0159] The circuit board assembly 20 includes a first connecting member 22 connected to the second portion 212. The first connecting member 22 is connected to the tab 13 and forms a joint 22A located on the third surface 212C. The joint 22A shares the space in the third direction Z with the substrate 21, which is conducive to improving the space utilization of the circuit board assembly 20 on the top wall 111.

[0160] Please continue to refer to Figure 5 In some embodiments, the third surface 212C includes a first body surface 2121, a first concave surface 2122 and a first connecting surface 2123. Along the second direction Y, the first body surface 2121 overlaps with the first portion 211, and the first concave surface 2122 is located on the side of the first body surface 2121 away from the first portion 211. Along the first direction X, the distance between the first body surface 2121 and the first wall 112 is D5, and the distance between the first concave surface 2122 and the first wall 112 is D6, D5 < D6, and 0.2mm ≤ D6-D5 ≤ 0.8mm. The first connecting surface 2123 is connected between the first body surface 2121 and the first concave surface 2122. Along the first direction X, the joint 22A is located on the first concave surface 2122, and along the second direction Y, the joint 22A overlaps with the first connecting surface 2123. The joint 22A shares the space in the first direction X and the second direction Y with the substrate 21, which is conducive to improving the space utilization of the circuit board assembly 20 on the top wall 111. By limiting 0.2mm ≤ D6-D5 ≤ 0.8mm, the joint 22A utilizes the accommodation space formed by the first concave surface 2122 and the first connecting surface 2123, and reduces the impact on the layout area of the second portion 212.

[0161] Optionally, D6-D5 is one of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm and other arbitrary values within the range of 0.2mm ≤ D6-D5 ≤ 0.8mm.

[0162] Please continue to refer to Figure 5 and Figure 7In some embodiments, the first connecting piece 22 is an "L"-shaped nickel sheet. The first connecting piece 22 includes a first segment 221, a second segment 222, and a third segment 223. The first segment 221 is connected to the first surface 212A, the third segment 223 is spaced apart from the third surface 212C along the first direction X, and the second segment 222 is bent and connected between the first segment 221 and the third segment 223. Specifically, the third segment 223 is spaced apart from the first concave surface 2122 along the first direction X.

[0163] The tab 13 includes a first extending segment 131, a second extending segment 132, a third extending segment 133, and a fourth extending segment 134 connected in sequence. The first extending segment 131 extends from the bent portion 121A, the second extending segment 132 is located on the side of the third segment 223 away from the third surface 212C along the first direction X, the third extending segment 133 is located on the side of the third segment 223 away from the first top surface 111A along the third direction Z, and the fourth extending segment 134 is located between the third segment 223 and the third surface 212C along the first direction X and connected to the third segment 223. The fourth extending segment 134 is connected to the third segment 223 to form a joint 22A, which is conducive to improving the stability of the connection between the first connecting piece 22 and the tab 13.

[0164] In some embodiments, as viewed along the third direction Z, the fourth surface 212D is provided with a third notch 2124, and the injection molding member 40 is filled in the third notch 2124, so as to facilitate the injection of the injection material into the area between the top wall 111 and the first insulating member 30 during the injection process.

[0165] Please refer to Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 includes a flexible circuit board 23 connected to the base plate 21, and the flexible circuit board 23 is configured to be electrically connected to an external circuit. The injection molding member 40 covers the part where the flexible circuit board 23 is connected to the base plate 21, so as to improve the stability of the connection between the flexible circuit board 23 and the base plate 21.

[0166] Optionally, the surface of the injection molding member 40 away from the top wall 111 is provided with a recess 41, and the flexible circuit board 23 extends from the recess 41, which is conducive to expanding the activity angle of the flexible circuit board 23.

[0167] Embodiment 2

[0168] Please refer to Figure 8 and Figure 9 An embodiment of the present application further provides a battery 100B. The battery 100B is different from the battery 100A in that the top sealing portion 121 is cut to form a notch.

[0169] The bending portion 121A includes a first side edge 121C away from the root 121B, and the first side edge 121C is provided with a second notch 1213 close to the two adjacent side seal extension portions 122A along the second direction Y. The second notch 1213 has a third edge 1214 and a fourth edge 1215. The third edge 1214 extends along the first direction X and is arranged opposite to the first portion 211 along the third direction Z. In the first direction X, the fourth edge 1215 extends from the third edge 1214 in a direction away from the top wall 111. In the first direction X, the first portion 211 is arranged opposite to the two adjacent fourth edges 1215. The third edge 1214 is located in the first bending section 1211, and one end of the fourth edge 1215 is located in the first bending section 1211 and the other end is located in the second bending section 1212. By arranging the second notch 1213, the space occupied by the second bending section 1212 in the first direction X is reduced, thereby reducing the risk of interference between the second bending section 1212 and the substrate 21.

[0170] In addition to the above differences, the parameters of the battery 100B are substantially the same as those of the battery 100A, and the description of the battery 100A above can be referred to.

[0171] Embodiment 3

[0172] Please refer to Figure 10 An embodiment of the present application also provides a battery 100C. The battery 100C is different from the battery 100A in that the side seal extension portion 122A is not cut to form a notch.

[0173] The side seal portion 122 includes a side seal body portion 122B, and the side seal body portion 122B and the side seal extension portion 122A are connected along the third direction Z, and the side seal body portion 122B is arranged opposite to the side wall 144. In the first direction X, the distance between the side seal extension portion 122A and the first wall 112 is equal to the distance between the side seal body portion 122B and the first wall 112, i.e. the side seal extension portion 122A is not cut to form a notch.

[0174] In the first direction X, the distance between the two adjacent side seal extension portions 122A and the first wall 112 is D2, and 1.5mm≤D2≤4.5mm, so that the first portion 211 is located on the side of the two adjacent side seal extension portions 122A close to the first wall 112, and the first portion 211 is arranged opposite to the first top surface 111A along the third direction Z.

[0175] It should be noted that the battery 100C is suitable for a battery with a relatively thick thickness, and the batteries 100A and 100B are suitable for a battery with a relatively thin thickness.

[0176] In addition to the above differences, the parameters of the battery 100C are substantially the same as those of the battery 100A, and the description of the battery 100A above can be referred to.

[0177] Embodiment 4

[0178] For your reference Figure 11 and Figure 12 An embodiment of the present application further provides a battery 100D. The battery 100D is different from the battery 100A in the connection structure of the first connecting piece 22 and the tab 13.

[0179] The first connecting piece 22 comprises a first section 221, a second section 222, a third section 223, a fourth section 224 and a fifth section 225. The first section 221 is connected to the first surface 212A, the third section 223 is spaced apart from the third surface 212C along the first direction X, the second section 222 is bent and connected between the first section 221 and the third section 223, the fifth section 225 is located on the side of the third section 223 away from the third surface 212C along the first direction X, and the fourth section 224 is bent and connected between the third section 223 and the fifth section 225.

[0180] The tab 13 comprises a first extension section 131, a second extension section 132, a third extension section 133 and a fourth extension section 134 connected in sequence. The first extension section 131 extends from the bending portion 121A, the second extension section 132 is located on the side of the fifth section 225 away from the third section 223 along the first direction X and connected to the fifth section 225, the third extension section 133 is located on the side of the fourth section 224 away from the first top surface 111A along the third direction Z, and the fourth extension section 134 is located between the third section 223 and the third surface 212C along the first direction X and connected to the third section 223. The fourth extension section 134 is connected to the third section 223, and the second extension section 132 and the fifth section 225 form a joint 22A, which is beneficial to improve the stability of the connection between the first connecting piece 22 and the tab 13.

[0181] For your reference Figure 13 In some embodiments, the fourth section 224 comprises a first sub-section 224A and a second sub-section 224B spaced apart along the second direction Y, and a gap 224C penetrating through the first connecting piece 22 is arranged between the first sub-section 224A and the second sub-section 224B to facilitate the bending of the fourth section 224.

[0182] In addition to the above differences, the parameters of the battery 100D are substantially the same as those of the battery 100A, and the description of the battery 100A above can be referred to.

[0183] Embodiment 5

[0184] For your reference Figure 14 An embodiment of the present application further provides a battery 100E. The battery 100E is different from the battery 100D in that the top sealing portion 121 is cut to form a gap.

[0185] The bending portion 121A includes a first side edge 121C away from the root 121B, and the first side edge 121C is provided with a second notch 1213 close to the two adjacent side seal extension portions 122A along the second direction Y. The second notch 1213 has a third edge 1214 and a fourth edge 1215. The third edge 1214 extends along the first direction X and is arranged opposite to the first portion 211 along the third direction Z. In the first direction X, the fourth edge 1215 extends from the third edge 1214 in a direction away from the top wall 111. In the first direction X, the first portion 211 is arranged opposite to the two adjacent fourth edges 1215. The third edge 1214 is located in the first bending section 1211, and one end of the fourth edge 1215 is located in the first bending section 1211 and the other end is located in the second bending section 1212. By arranging the second notch 1213, the space occupied by the second bending section 1212 in the first direction X is reduced, thereby reducing the risk of interference between the second bending section 1212 and the substrate 21.

[0186] In addition to the above differences, the parameters of the battery 100E are substantially the same as those of the battery 100D, and the description of the battery 100D above can be referred to.

[0187] Embodiment 6

[0188] Please refer to Figure 15 An embodiment of the present application also provides a battery 100F. The battery 100F is different from the battery 100D in that the side seal extension portion 122A is not cut to form a notch.

[0189] The side seal portion 122 includes a side seal body portion 122B, the side seal body portion 122B and the side seal extension portion 122A are connected along the third direction Z, and the side seal body portion 122B is arranged opposite to the side wall 144. In the first direction X, the distance between the side seal body portion 122B and the first wall 112 is equal to D 1， That is, the side seal extension portion 122A is not cut to form a notch.

[0190] In the first direction X, the distance between the two adjacent side seal extension portions 122A and the first wall 112 is D2, and 1.5mm≤D2≤4.5mm, so that the first portion 211 is located on the side of the two adjacent side seal extension portions 122A close to the first wall 112, and the first portion 211 is arranged opposite to the first top surface 111A along the third direction Z.

[0191] It should be noted that the battery 100F is suitable for a battery with a relatively thick thickness, and the batteries 100D and 100E are suitable for a battery with a relatively thin thickness.

[0192] In addition to the above differences, the parameters of the battery 100F are substantially the same as those of the battery 100D, and the description of the battery 100D above can be referred to.

[0193] Embodiment 7

[0194] For your reference, please also refer to Figure 16 and Figure 17 An embodiment of the present application further provides a battery 100G. The battery 100G is different from the battery 100A in that the first connecting piece 22 and the connecting structure of the tab 13.

[0195] The first connecting piece 22 is a nickel block, and the first connecting piece 22 is located on the third surface 212C.

[0196] The tab 13 comprises a first extension section 131, a second extension section 132 and a third extension section 133 connected in sequence. The first extension section 131 extends from the bending portion 121A, the second extension section 132 is located on one side of the first connecting piece 22 in the first direction X and connected to the first connecting piece 22, and the third extension section 133 is stacked on the second surface 212B. The second extension section 132 is connected to the first connecting piece 22 to form a joint portion 22A, which is beneficial to improve the stability of the connection between the first connecting piece 22 and the tab 13.

[0197] It can be understood that, in some embodiments, the third surface 212C is provided with a solder pad, and the second extension section 132 is welded to the solder pad of the third surface 212C.

[0198] It can be understood that, in some embodiments, the second surface 212B is provided with a solder pad, and the second extension section 132 is located on one side of the third surface 212C in the first direction X, and the second extension section 132 is welded to the solder pad of the second surface 212B.

[0199] In addition to the above differences, the parameters of the battery 100G are substantially the same as those of the battery 100A, and the description of the battery 100D above can be referred to.

[0200] Embodiment 8

[0201] For your reference, please also refer to Figure 18 An embodiment of the present application further provides a battery 100H. The battery 100E is different from the battery 100G in that the top sealing portion 121 is cut to form a gap.

[0202] The bending portion 121A includes a first side edge 121C away from the root portion 121B, and the first side edge 121C is provided with a second notch 1213 close to the two adjacent side seal extension portions 122A along the second direction Y. The second notch 1213 has a third edge 1214 and a fourth edge 1215. The third edge 1214 extends along the first direction X and is arranged opposite to the first portion 211 along the third direction Z. In the first direction X, the fourth edge 1215 extends from the third edge 1214 in a direction away from the top wall 111. In the first direction X, the first portion 211 is arranged opposite to the two adjacent fourth edges 1215. The third edge 1214 is located in the first bending section 1211, and one end of the fourth edge 1215 is located in the first bending section 1211 and the other end is located in the second bending section 1212. By arranging the second notch 1213, the space occupied by the second bending section 1212 in the first direction X is reduced, thereby reducing the risk of interference between the second bending section 1212 and the substrate 21.

[0203] In addition to the above differences, the parameters of the battery 100H are substantially the same as those of the battery 100G, and the above description of the battery 100G can be referred to.

[0204] Embodiment 9

[0205] Please refer to Figure 19 An embodiment of the present application also provides a battery 100I. The battery 100I is different from the battery 100G in that the side seal extension portion 122A is not cut to form a notch.

[0206] The side seal portion 122 includes a side seal body portion 122B, the side seal body portion 122B and the side seal extension portion 122A are connected along the third direction Z, and the side seal body portion 122B is arranged opposite to the side wall 144. In the first direction X, the distance between the side seal body portion 122B and the first wall 112 is equal to D 1， That is, the side seal extension portion 122A is not cut to form a notch.

[0207] In the first direction X, the distance between the two adjacent side seal extension portions 122A and the first wall 112 is D2, and 1.5mm≤D2≤4.5mm, so that the first portion 211 is located on the side of the two adjacent side seal extension portions 122A close to the first wall 112, and the first portion 211 is arranged opposite to the first top surface 111A along the third direction Z.

[0208] It should be noted that the battery 100I is suitable for a battery with a relatively thick thickness, and the battery 100G and the battery 100H are suitable for a battery with a relatively thin thickness.

[0209] In addition to the above differences, the parameters of the battery 100I are substantially the same as those of the battery 100G, and the above description of the battery 100D can be referred to.

[0210] Embodiment 10

[0211] For your reference Figure 20 and Figure 21 An embodiment of the present application further provides a battery 100J. The battery 100J is different from the battery 100A in the connection structure of the first connecting piece 22 and the tab 13.

[0212] The first connecting piece 22 is located on the first surface 212A. The first connecting piece 22 is a "U"-shaped nickel sheet. The first connecting piece 22 comprises a first section 221, a second section 222 and a third section 223. The first section 221 is connected to the first surface 212A, the third section 223 is spaced apart from the first section 221 along the third direction Z, and the second section 222 is bent and connected between the first section 221 and the third section 223.

[0213] The tab 13 comprises a first extension section 131, a second extension section 132 and a third extension section 133 connected in sequence. The first extension section 131 extends from the bending portion 121A, the third extension section 133 is located between the first section 221 and the third section 223 and connected to the first section 221, and the second extension section 132 is bent and connected between the first extension section 131 and the third extension section 133, which is beneficial to improve the stability of the connection between the first connecting piece 22 and the tab 13.

[0214] In addition to the above differences, the parameters of the battery 100J are substantially the same as those of the battery 100A, and the description of the battery 100A can be referred to.

[0215] Embodiment 11

[0216] For your reference Figure 22 An embodiment of the present application further provides a battery 100K. The battery 100E is different from the battery 100J in that the top sealing portion 121 is cut to form a gap.

[0217] The bending portion 121A includes a first side edge 121C away from the root 121B, and the first side edge 121C is provided with a second notch 1213 close to the two adjacent side seal extension portions 122A along the second direction Y. The second notch 1213 has a third edge 1214 and a fourth edge 1215. The third edge 1214 extends along the first direction X and is arranged opposite to the first portion 211 along the third direction Z. In the first direction X, the fourth edge 1215 extends from the third edge 1214 in a direction away from the top wall 111. In the first direction X, the first portion 211 is arranged opposite to the two adjacent fourth edges 1215. The third edge 1214 is located in the first bending section 1211, and one end of the fourth edge 1215 is located in the first bending section 1211 and the other end is located in the second bending section 1212. By arranging the second notch 1213, the space occupied by the second bending section 1212 in the first direction X is reduced, thereby reducing the risk of interference between the second bending section 1212 and the substrate 21.

[0218] In addition to the above differences, the parameters of the battery 100K are substantially the same as those of the battery 100J, and the description of the battery 100J above can be referred to.

[0219] Embodiment 12

[0220] Please refer to Figure 23 An embodiment of the present application also provides a battery 100L. The battery 100L is different from the battery 100J in that the side seal extension portion 122A is not cut to form a notch.

[0221] The side seal portion 122 includes a side seal body portion 122B, the side seal body portion 122B and the side seal extension portion 122A are connected along the third direction Z, and the side seal body portion 122B is arranged opposite to the side wall 144. In the first direction X, the distance between the side seal body portion 122B and the first wall 112 is equal to D 1， That is, the side seal extension portion 122A is not cut to form a notch.

[0222] In the first direction X, the distance between the two adjacent side seal extension portions 122A and the first wall 112 is D2, and 1.5mm≤D2≤4.5mm, so that the first portion 211 is located on the side of the two adjacent side seal extension portions 122A close to the first wall 112, and the first portion 211 is arranged opposite to the first top surface 111A along the third direction Z.

[0223] It should be noted that the battery 100L is suitable for a battery with a relatively thick thickness, and the batteries 100J and 100K are suitable for a battery with a relatively thin thickness.

[0224] In addition to the above differences, the parameters of the battery 100L are substantially the same as those of the battery 100J, and the description of the battery 100J above can be referred to.

[0225] Embodiment 13

[0226] Please refer to Figure 24 An embodiment of the present application further provides a terminal device 200, comprising the battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K, 100L) in any of the above embodiments.

[0227] Optionally, the terminal device 200 can be a mobile phone, a tablet computer, a notebook computer, a smart wearable product (for example, a smart watch, a smart bracelet), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or the like, which has a charging battery.

[0228] In summary, in the above battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K, 100L) and the terminal device 200, the substrate 21 comprises a first part 211 and two second parts 212. Along the first direction X, the first part 211 is located on one side of the two adjacent side seal extension parts 122A close to the first wall 112, and the first part 211 is arranged opposite to the first top surface 111A along the third direction Z to avoid the two side seal extension parts 122A. Along the second direction Y, the two second parts 212 are respectively connected to the two ends of the first part 211, and each second part 212 is arranged opposite to the bent part 121A of one battery cell 10 along the third direction Z and connected to the corresponding tab 13. The substrate 21 shares the space along the third direction Z with the side seal extension part 122A, which can reduce the space occupied by the substrate 21 along the third direction Z, and is beneficial to increase the volume of the main body part 11 to improve the capacity of the battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K, 100L).

[0229] In addition, those skilled in the art can make other changes within the spirit of the present application, of course, these changes made according to the spirit of the present application should be included in the scope disclosed by the present application.

Claims

1. A battery, characterized by, The battery comprises: Two battery cells, the thickness direction of the two battery cells is a first direction, and the two battery cells are arranged along a second direction when viewed along the first direction, the battery cell comprises a main body part, a packaging part, and a tab, the main body part comprises a top wall, a first wall and a second wall connected to the top wall along the first direction, and two side walls connected to the top wall along the second direction, the packaging part comprises a top sealing part connected to the top wall and a side sealing part connected to the side wall, the top sealing part comprises a bending part and a root part connected between the bending part and the top wall, the top wall comprises a first top surface between the root part and the first wall, the bending part is bent towards the first top surface, the tab extends from the bending part, the side sealing part is bent in a direction towards the first wall, the side sealing part comprises a side sealing extension part protruding out of the top wall along a third direction, the side sealing extension part is connected to the bending part, the first direction, the second direction, and the third direction are perpendicular to each other; A circuit board assembly, the circuit board assembly comprises a substrate, the thickness direction of the substrate intersects the first direction, the substrate comprises a first part and two second parts, along the first direction, the first part is located on one side of the two adjacent side sealing extension parts close to the first wall, and the first part is arranged opposite to the first top surface along the third direction, along the second direction, the two second parts are respectively connected to two ends of the first part, and each second part is arranged opposite to the bending part of the battery cell along the third direction and is connected to the corresponding tab.

2. The battery of claim 1, wherein, The bending part comprises a first bending section and a second bending section connected to both ends of the first bending section along the second direction, the first bending section is arranged opposite to the second part along the third direction, the second bending section extends from the first bending section along the third direction away from the top wall, the second bending section is connected between the first bending section and the side sealing extension part, along the first direction, the first part is arranged opposite to the two adjacent second bending sections; Along the first direction, the distance between the first bending section and the first wall is D1, the distance between the two adjacent side sealing extension parts and the first wall is D2, D1 < D2, 0.15 mm ≤ D2 - D1 ≤ 0.25 mm.

3. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. Along the first direction, the width of the first part is W1, 1 mm ≤ W1 ≤ 4 mm, D2 ≥ W1, 1.5 mm ≤ D2 ≤ 4.5 mm; Along the second direction, the length of the first part is L1, 3 mm ≤ L1 ≤ 12 mm.

4. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The side edge of the side sealing extension part close to the first wall is provided with a first notch, and part of the first part is located in the first notch.

5. The battery of claim 4, wherein the cathode is a lithium cobalt oxide cathode. The first notch has a first edge and a second edge, the first edge extends along the third direction and is opposite to the first part along the first direction, the second edge extends along the first direction and is opposite to the first part along the third direction, the length of the first edge is L2, 1mm≤L2≤5mm, the length of the second edge is L3, 0.5mm≤L3≤3.5mm.

6. The battery of claim 5, wherein the cathode is a lithium cobalt oxide cathode. Along the first direction, the distance between the first edge and the side seal extension away from the side edge of the first wall is D3, 1.5mm≤D3≤4.5mm.

7. The battery of claim 1 or 4, wherein the cathode comprises a lithium metal oxide. The circuit board assembly comprises a first electronic element, the first electronic element is arranged on the surface of the second part close to the bending part; The bending part comprises a first bending segment and a second bending segment connected to both ends of the first bending segment along the second direction, the first bending segment is opposite to the second part along the third direction, the second bending segment extends from the first bending segment along the third direction away from the top wall, the second bending segment is connected between the first bending segment and the side seal extension, along the first direction, the first part is opposite to two adjacent second bending segments.

8. The battery of claim 1 or 4, wherein the cathode comprises a lithium metal oxide. The bending part comprises a first side edge away from the root part, the first side edge is provided with a second notch, along the second direction, the second notch is close to two adjacent side seal extensions; The second notch has a third edge and a fourth edge, the third edge extends along the first direction and is opposite to the first part along the third direction, the fourth edge extends from the third edge along the direction away from the top wall as viewed along the first direction, along the first direction, the first part is opposite to two adjacent fourth edges.

9. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The top wall comprises a second top surface between the root part and the second wall; The battery comprises a first insulating piece, the first insulating piece comprises a first insulating part, a second insulating part and a third insulating part, along the third direction, the first insulating part is arranged on one side of two adjacent side seal extensions away from the top wall, the second insulating part and the third insulating part are connected to both sides of the first insulating part along the first direction, as viewed along the third direction, the first insulating part covers the part of the packaging part between two second parts, as viewed along the first direction, the second insulating part covers the gap between two first top surfaces and the part of the packaging part between two second parts, and the third insulating part covers the gap between two second top surfaces and the part of the packaging part between two second parts; The battery comprises an injection molding piece, the injection molding piece connects the first insulating piece and the area of the top wall away from the first insulating piece, and the injection molding piece covers the top seal part, the tab and the substrate.

10. The battery of claim 9, wherein the electrolyte comprises a lithium salt. The thickness direction of the substrate is parallel to the third direction, the second part includes a first surface, a second surface, a third surface and a fourth surface, the first surface and the second surface are oppositely arranged along the third direction, and the first surface is close to the top wall, the second surface is away from the top wall, the third surface and the fourth surface are oppositely arranged along the first direction, and the third surface is close to the first wall, and the fourth surface is close to the second wall. The circuit board assembly includes a first connecting piece connected to the second part, the first connecting piece is connected with the tab and forms a combined part, and the combined part is located on the third surface.

11. The battery of claim 10, wherein the cathode comprises a lithium metal oxide. The third surface includes a first body surface, a first concave surface and a first connecting surface, along the second direction, the first body surface overlaps the first part, the first concave surface is located on the side of the first body surface away from the first part, along the first direction, the distance between the first body surface and the first wall is D5, the distance between the first concave surface and the first wall is D6, D5 < D6, and 0.2mm ≤ D6-D5 ≤ 0.8mm, the first connecting surface is connected between the first body surface and the first concave surface, along the first direction, the combined part is located on the first concave surface, and along the second direction, the combined part overlaps the first connecting surface.

12. The battery of claim 10, wherein the cathode comprises a lithium metal oxide. The first connecting piece includes a first segment, a second segment and a third segment, the first segment is connected to the first surface, the third segment is spaced apart from the third surface along the first direction, and the second segment is connected between the first segment and the third segment in a bent manner. The tab includes a first extension segment, a second extension segment, a third extension segment and a fourth extension segment connected in sequence, the first extension segment extends from the bending part, the second extension segment is located on the side of the third segment away from the third surface along the first direction, the third extension segment is located on the side of the third segment away from the first top surface along the third direction, and the fourth extension segment is located between the third segment and the third surface along the first direction and connects the third segment.

13. The battery of claim 10, wherein the cathode comprises a lithium metal oxide. The first connecting piece includes a first segment, a second segment, a third segment, a fourth segment and a fifth segment, the first segment is connected to the first surface, the third segment is spaced apart from the third surface along the first direction, the second segment is connected between the first segment and the third segment in a bent manner, the fifth segment is located on the side of the third segment away from the third surface along the first direction, and the fourth segment is connected between the third segment and the fifth segment in a bent manner. The tab includes a first extension segment, a second extension segment, a third extension segment and a fourth extension segment connected in sequence, the first extension segment extends from the bending part, the second extension segment is located on the side of the fifth segment away from the third segment along the first direction and connects the fifth segment, the third extension segment is located on the side of the fourth segment away from the first top surface along the third direction, and the fourth extension segment is located between the third segment and the third surface along the first direction and connects the third segment.

14. The battery of claim 13, wherein the electrolyte comprises a lithium salt. The fourth section comprises a first sub-section and a second sub-section arranged at intervals along the second direction, and a gap is arranged between the first sub-section and the second sub-section and penetrates the first connecting piece.

15. The battery of claim 10, wherein the cathode comprises a lithium metal oxide. The fourth surface is provided with a third gap when viewed along the third direction, and the injection molding part is filled in the third gap.

16. A terminal device, characterized by comprising: The terminal device comprises a battery as claimed in any one of claims 1 to 15.

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