Battery and terminal device

Abstract

The invention discloses a battery and a terminal device. The battery comprises two battery cells and a circuit board assembly, 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, a second wall and two side walls. The packaging part comprises a top sealing part and a side sealing part. The top sealing part comprises a bent part and a root part. The top wall comprises a first top surface, and the bending part is bent towards the first top surface. The bending part comprises a first bending section and two second bending sections, the first bending section and the top wall are oppositely arranged, and the second bending sections extend from the first bending section in the direction away from the top wall. And the tab extends out of the first bent section. The side sealing part is bent in the direction towards the first wall and comprises a side sealing extending part, and the side sealing extending part is connected with the second bent section to form a convex corner part. The circuit board assembly comprises a substrate. The substrate comprises two first sub-substrates, and each first sub-substrate is arranged on one first bending section and connected with the corresponding tab. According to the battery, the circuit board assembly can be conveniently placed on one side of the two battery cells.

Description

Technical Field

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

[0002] The dual-cell structure of the battery can increase the charging speed and reduce the temperature rise, and is widely used in high-end mobile phones. Existing cells are usually folding top sealed cells, and a single folding top sealed cell has a convex corner. When the battery uses a dual-cell solution, the two adjacent convex corners will interfere with the protection plate, which is not conducive to the placement of the protection plate. Summary of the invention

[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, the battery comprising two battery cells and a circuit board assembly. The thickness direction of the two battery cells is a first direction. When viewed along the first direction, the two battery cells are arranged along a second direction. The battery cell comprises a main body, a packaging portion and a pole ear. The main body comprises a top wall, a first wall and a second wall connected to the top wall along a first direction, and two side walls connected to the top wall along a second direction. The packaging portion comprises a top sealing portion connected to the top wall and a side sealing portion connected to the side wall. The top sealing portion comprises a bending portion and a root portion connected between the bending portion and the top wall. The top wall comprises a first top surface between the root portion and the first wall, and the bending portion is bent toward the first top surface. The bending portion 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 top wall along a third direction, and the second bending section extends from the first bending section along the third direction in a direction away from the top wall. The pole ear extends from the first bending section. The side seal portion is bent in a direction toward the first wall, and the side seal portion includes a side seal extension portion protruding from the top wall along the third direction, and the side seal extension portion is connected to the second bending section to form a convex angle portion. The first direction, the second direction and the third direction are perpendicular to each other. The circuit board assembly includes a substrate. The substrate includes two first sub-substrates arranged along the second direction, and each first sub-substrate is arranged in a first bending section and connected to a corresponding pole ear.

[0005] In the above-mentioned battery, the substrate includes two first sub-substrates arranged along the second direction and electrically connected. Each first sub-substrate is arranged in a first bending section and connected to the corresponding pole ear so as to avoid two adjacent convex corners, which is beneficial to reduce the risk of interference between the two adjacent convex corners and the substrate, and further facilitates placing the circuit board assembly on one side of the two battery cells.

[0006] In some embodiments of the present application, the first sub-substrate is located between two convex corners of the battery cell along the second direction. The circuit board assembly includes a first flexible circuit board, a second flexible circuit board and a first protective device. The first flexible circuit board includes a first connecting portion and two second connecting portions. Along the third direction, the first connecting portion is arranged on the side of two adjacent convex corners away from the top wall. Along the second direction, the two second connecting portions are arranged at both ends of the first connecting portion, and each second connecting portion is connected to a first sub-substrate. The second flexible circuit board extends from the first flexible circuit board in a direction away from the top wall. When viewed along the first direction, the second flexible circuit board is separated from the battery cell, and the second flexible circuit board is configured to be electrically connected to an external circuit. The first protective device is arranged on the second flexible circuit board so that the first protective device is away from the top seal portion, so that the first protective device can utilize the space of the accommodating cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly at the battery head, which is beneficial to improving the energy density of the battery.

[0007] In some embodiments of the present application, the first sub-substrate includes a third flexible circuit board and a reinforcement plate stacked along a third direction. The second connecting portion is connected to the third flexible circuit board, and the first flexible circuit board is integrally arranged with the two third flexible circuit boards to improve the stability of the electrical connection between the first flexible circuit board and the two first sub-substrates.

[0008] In some embodiments of the present application, the first protection device includes a first PCB board and a first electronic component. The second flexible circuit board includes a first part, a second part and a third part. The first part is connected to the substrate or the first flexible circuit board, and the first part extends in a direction away from the top wall. The second part is connected to an end of the first part away from the top wall, the first PCB board is arranged on the second part, and the first electronic component is arranged on a surface of the first PCB board away from the second part. The third part is connected to the second part and is configured to be electrically connected to an external circuit.

[0009] In some embodiments of the present application, the circuit board assembly further includes an injection molding portion disposed on the second portion, and the second portion, the first PCB board, and the first electronic component are located in the injection molding portion. The injection molding portion is used to improve the drop resistance of the first protection device and the second portion. In addition, the injection molding portion can also contact with external structural parts such as the cavity wall of the accommodating cavity of the terminal device to transfer the heat generated by the first protection device to the external structural parts, which is conducive to reducing the temperature rise of the first protection device.

[0010] In some embodiments of the present application, along the third direction, there is a height difference L3 between the first connection portion and the first sub-substrate. The second connection portion extends from the first connection portion in a direction toward the top wall. Along the second direction, the second connection portion is arranged opposite to two adjacent convex corner portions, so that the first flexible circuit board forms an inverted "U" shape structure, which is conducive to the first flexible circuit board avoiding the two adjacent convex corner portions.

[0011] In some embodiments of the present application, the circuit board assembly includes a second protection device, and the second protection device is disposed on a surface of the substrate away from the top wall. Along the third direction, the height of the second protection device is H3, H3≤L3, so as to reduce the space waste caused by the second protection device protruding from the first connection portion, which is beneficial to reducing the space occupied by the circuit board assembly at the battery head, thereby facilitating improving the energy density of the battery.

[0012] In some embodiments of the present application, the circuit board assembly includes two first connectors, which are arranged on a surface of the substrate away from the top wall and connected to the corresponding tabs of the battery cell. Along the second direction, the two first connectors are arranged at intervals, and the second protection device is located between the two first connectors to facilitate layout.

[0013] In some embodiments of the present application, the first sub-substrate is located between two convex corners of the battery cell along the second direction. The substrate includes a second sub-substrate. Along the first direction, the second sub-substrate is located on the side of the two adjacent convex corners close to the first wall, and the second sub-substrate and the first top surface are arranged opposite to each other along the third direction to avoid the two convex corners. Along the second direction, the two first sub-substrates are respectively connected to the two ends of the second sub-substrate, and each first sub-substrate is arranged opposite to the first bending section of a battery cell along the third direction. The second sub-substrate is integrally arranged with the two first sub-substrates. The substrate and the convex corners share the space in the third direction, which can reduce the space occupied by the substrate in the third direction, which is beneficial to increase the volume of the main body to increase the capacity of the battery.

[0014] In some embodiments of the present application, along the first direction, the distance between the first bending section and the first wall is D1, the distance between two adjacent side seal extensions and the first wall is D2, D1<D2, 0.15mm≤D2-D1≤0.25mm, so as to reduce the risk of interference between the side seal extension and the second sub-substrate, and facilitate increasing the size of the second sub-substrate along the first direction, which is beneficial to improving the structural strength and current-carrying capacity of the second sub-substrate.

[0015] In some embodiments of the present application, a first notch is provided on a side of the side seal extension portion close to the first wall, and a portion of the second sub-substrate is located in the first notch to reduce the risk of interference between the side seal extension portion and the second sub-substrate.

[0016] In some embodiments of the present application, the first notch has a first edge and a second edge, the first edge extends along the third direction and is arranged opposite to the second sub-substrate along the first direction, and the second edge extends along the first direction and is arranged opposite to the second sub-substrate along the third direction. The length of the first edge is L5, 1mm≤L5≤5mm, so as to reduce the risk of interference between the second edge and the second sub-substrate and improve the packaging strength of the side seal extension. The length of the second edge is L6, 0.5mm≤L6≤3.5mm, so as to reduce the risk of interference between the first edge and the second sub-substrate and improve the packaging strength of the side seal extension.

[0017] In some embodiments of the present application, the circuit board assembly includes a third electronic component, which is arranged on the surface of the first sub-substrate close to the first bending section to increase the distance between the first sub-substrate and the top wall in the third direction, so that the first sub-substrate avoids the larger volume of the second bending section, thereby reducing the risk of interference between the second bending section and the substrate.

[0018] In some embodiments of the present application, the bending portion includes a first side away from the root. The first side is provided with a second notch, and 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 arranged opposite to the second sub-substrate along the third direction, and when viewed along the first direction, the fourth edge extends from the third edge in a direction away from the top wall. Along the first direction, the second sub-substrate is arranged opposite to the two adjacent fourth edges. By providing the second notch, the space occupied by the second bending section in the first direction is reduced, thereby reducing the risk of interference between the second bending section and the substrate.

[0019] In some embodiments of the present application, the thickness direction of the substrate is parallel to the third direction. The first sub-substrate includes a first surface, a second surface, a third surface and a fourth surface. The first surface and the second surface are arranged relative to each other along the third direction, and the first surface is close to the top wall, and the second surface is far from the top wall. The third surface and the fourth surface are arranged relative to each other 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 second connector, and the second connector is connected to the first sub-substrate. The second connector is connected to the pole ear and forms a joint, and the joint is located on the third surface. The joint shares the space in the third direction with the substrate, which is conducive to improving the space utilization of the circuit board assembly on the top wall.

[0020] In some embodiments of the present application, the third surface includes a first body surface, a first concave surface, and a first connection surface. The first body surface is connected to the second sub-substrate, and the first concave surface is located on the side of the first body surface away from the second sub-substrate. 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, and the first connection surface is connected between the first body surface and the first concave surface. Along the first direction, the bonding portion is located on the first concave surface, and along the second direction, the bonding portion overlaps with the first connection surface. The bonding portion and the substrate share the space in the first direction and the second direction, which is conducive to improving the space utilization of the circuit board assembly on the top wall.

[0021] In some embodiments of the present application, the top wall includes a second top surface located between the root and the second wall. The battery includes a second insulating member, and the second insulating member includes a first insulating portion, a second insulating portion, and a third insulating portion. Along the third direction, the first insulating portion is arranged on the side of the two adjacent convex corners away from the top wall, and the second insulating portion and the third insulating portion are connected to both sides of the first insulating portion along the first direction. When viewed along the third direction, the first insulating portion covers the two adjacent convex corners. When viewed along the first direction, the second insulating portion covers the gap between the two first top surfaces and the two adjacent convex corners. The third insulating portion covers the gap between the two second top surfaces and the two adjacent convex corners. The second insulating member can improve the insulation stability between the two adjacent convex corners and other structural members. The battery includes an injection molded part, which connects the second insulating member and the area where the top wall is separated from the second insulating member, and the injection molded part covers the top seal, the pole ear and the substrate. The second insulating member can reduce the risk of the injection molding material penetrating into the gap between the two battery cells during the injection molding process.

[0022] In some embodiments of the present application, the first sub-substrate is located between two convex corners of the battery cell along the second direction. The circuit board assembly includes a fourth flexible circuit board. The fourth flexible circuit board includes a third connection portion and two fourth connection portions, the third connection portion extending from the second wall of one of the battery cells to the second wall of the other battery cell, and along the second direction, the two fourth connection portions are arranged at both ends of the third connection portion and are electrically connected to a corresponding first sub-substrate. The fourth flexible circuit board is arranged on the second wall, which can reduce the space occupied by the circuit board assembly at the battery head, which is conducive to improving the energy density of the battery.

[0023] In some embodiments of the present application, the top wall includes a second top surface located between the root and the second wall. Along the first direction, the width of the first top surface is W3, and the width of the second top surface is W4, W3>W4. The battery includes a wrapping film, the wrapping film connects the second walls of the two battery cells, and when viewed along the first direction, the wrapping film is spaced from the fourth flexible circuit board so that the fourth flexible circuit board and the wrapping film share the space in the first direction, which is beneficial to improving the energy density of the battery.

[0024] In some embodiments of the present application, the substrate includes a third sub-substrate. Along the third direction, the third sub-substrate is arranged on the side of the two adjacent convex corners away from the top wall, and along the second direction, the two first sub-substrates are arranged at both ends of the third sub-substrate. The third sub-substrate is integrally arranged with the two first sub-substrates. A first cut angle is provided at the intersection of the side seal extension and the second bending section. The first cut angle includes a first side and a second side, the first side is located at the side seal extension, and the second side is located at the second bending section. Along the third direction, the first side and the second side intersect at the vertex of the convex corner away from the top wall. The distance between the vertex and the top wall is H6, 0.5mm≤H6≤1.5mm. The first cut angle is used to reduce the height of the convex corner so as to reduce the space occupied by the substrate in the third direction, which is conducive to increasing the volume of the main body to improve the capacity and energy density of the battery.

[0025] In some embodiments of the present application, the circuit board assembly includes a third connecting member and a fourth electronic component. The third connecting member is arranged on the surface of the first sub-substrate close to the first bending section and is connected to the corresponding electrode ear of the battery cell. The fourth electronic component is arranged on the surface of the first sub-substrate close to the first bending section, so that the third connecting member and the fourth electronic component share the space in the third direction with the convex corner portion, which can reduce the space occupied by the circuit board assembly in the third direction, and is conducive to increasing the volume of the main body to improve the capacity and energy density of the battery.

[0026] An embodiment of the present application further provides a terminal device, which includes any one of the batteries in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the disassembled structure of the battery head in one embodiment of the present application.

[0029] Figure 3 yes Figure 1 Sectional view along section line III-III.

[0030] Figure 4 It is a structural schematic diagram of an embodiment of the present application in which the injection molding portion of the battery is provided with a recess.

[0031] Figure 5 It is a schematic structural diagram of a first buffer member, a first protective member, a second protective member and a first insulating member of a battery in an embodiment of the present application.

[0032] Figure 6 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0033] Figure 7It is a schematic diagram of the structure of a circuit board assembly of a battery in one embodiment of the present application.

[0034] Figure 8 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0035] Fig. 9 It is a structural schematic diagram of the connection between a battery cell and a circuit board assembly in one embodiment of the present application.

[0036] Fig.10 It is a schematic structural diagram of a battery cell and a circuit board assembly separated in one embodiment of the present application.

[0037] Fig.11 yes Fig. 9 Partial section view along section line Ⅺ-Ⅺ.

[0038] Fig.12 It is a schematic structural diagram of a first insulating member and a first top surface of a battery in one embodiment of the present application.

[0039] Fig.13 It is a schematic structural diagram of a first insulating member and a second top surface of a battery in one embodiment of the present application.

[0040] Fig.14 yes Fig.12 Partial sectional view along section line XIV-XIV.

[0041] Fig.15 It is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0042] Fig.16 yes Fig.15 A partial enlarged view of region XVI in the middle.

[0043] Fig.17 It is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0044] Fig.18 It is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0045] Fig.19 yes Fig.18 Partial section view along section line XIX-XIX.

[0046] Fig. 20 It is a schematic structural diagram of a first connecting member of a battery in an embodiment of the present application.

[0047] Fig.21 It is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0048] Fig. 22It is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0049] Fig.23 It is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0050] Fig.24 yes Fig.23 Partial section view along section line XXIV-XXIV.

[0051] Fig.25 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0052] Fig.26 It is a schematic diagram of the structure of a fourth flexible circuit board of a battery in one embodiment of the present application.

[0053] Fig. 27 It is a schematic diagram of the structure of a battery wrapping film in one embodiment of the present application.

[0054] Fig.28 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0055] Fig.29 It is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0056] Fig.30 It is a schematic structural diagram of an unfolded packaging portion of a battery cell in an embodiment of the present application.

[0057] Fig.31 It is a schematic diagram of the structure of a terminal device in an embodiment of the present application.

[0058] Fig.32 It is a schematic diagram of the structure of a terminal device in another embodiment of the present application.

[0059] Main component symbols Battery 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K Terminal devices 200A, 200B Battery 10 Main body 11 Top wall 111 First top surface 111A Second top surface 111B First Wall 112 Second Wall 113 Side wall 114 Packaging unit 12 Convex corner portion 12A Top seal 121 Bending portion 121A The first bending section 1211 The second bending section 1212 The second gap 1213 The third edge 1214 Fourth Edge 1215 Root 121B First side 121C Side sealing part 122 Side seal extension 122A First Gap 1221 First Edge 1222 Second Edge 1223 Side seal body 122B Tab 13 The first extension section 131 The second extension section 132 The third extension section 133 Fourth extension section 134 Circuit board assembly 20 Substrate 21 The first sub-substrate 211 The third flexible circuit board 2111 Reinforcement plate 2112 First surface 211A Second surface 211B The third surface 211C First ontology face 2113 First concave surface 2114 First connection surface 2115 Fourth surface 211D The third gap 2116 The second sub-substrate 212 First flexible printed circuit board 22 The first connection portion 221 The second connection portion 222 Second flexible printed circuit board 23 Part 1231 Part 2232 Adhesive 2321 Part 3 233 Connector 2331 Reinforcement 2332 First protection device 24, 96 First PCB board 241 First electronic component 242 Second electronic component 243 Injection molding department 25 Recess 251 First connecting member 26 First paragraph 261 262 Section 3 263 The second protection device 27 The second connecting member 28 Joint 28A First paragraph 281 Second paragraph 282 Section 3 283 Section 4 284 First subsection 284A Second subsection 284B Gap 284C Fourth flexible circuit board 29 The third connection portion 291 Fourth connection portion 292 Fourth electronic component 201 The third connecting member 202 The first buffer member 30 First buffer portion 31 Second buffer portion 32 The first protection member 40 The first protection part 41 The second protection part 42 The second protection member 50 The first insulating member 60 The second insulating member 71 First insulating portion 711 The second insulating portion 712 The third insulating portion 713 Injection molded parts 80 Recess 81 Wrap film 90 Motherboard 95 First direction X Second direction Y The third direction Z The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0061] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally arranged element at the same time. When an element is considered to be "set" on another element, it may be directly set on the other element or there may be a centrally arranged element at the same time. It should be understood that, considering the factors of actual processing tolerance, in the technical solution of the present application, when two elements are set parallel / vertically and in the same direction, there may be a certain angle between the two elements, and the angle between the two elements is allowed to have a tolerance of 0-±10%.

[0062] When a value is considered to be "equal" to another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be roughly equal. When a value is considered to be in a "1:1" ratio with another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be equal in ratio.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items. The term "overlap" used herein refers to the overlap of the projections of two parts or the overlap of the projections of two parts.

[0064] One embodiment of the present application provides a battery, the battery comprising two battery cells and a circuit board assembly. The thickness direction of the two battery cells is a first direction. When viewed along the first direction, the two battery cells are arranged along a second direction. The battery cell comprises a main body, a packaging portion and a pole ear. The main body 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 portion comprises a top sealing portion connected to the top wall and a side sealing portion connected to the side wall. The top sealing portion comprises a bending portion and a root portion connected between the bending portion and the top wall. The top wall comprises a first top surface between the root portion and the first wall, and the bending portion is bent toward the first top surface. The bending portion 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 top wall along a third direction, and the second bending section extends from the first bending section along the third direction in a direction away from the top wall. The pole ear extends from the first bending section. The side seal portion is bent in a direction toward the first wall, and the side seal portion includes a side seal extension portion protruding from the top wall along the third direction, and the side seal extension portion is connected to the second bending section to form a convex angle portion. The first direction, the second direction and the third direction are perpendicular to each other. The circuit board assembly includes a substrate. The substrate includes two first sub-substrates arranged along the second direction, and each first sub-substrate is arranged in a first bending section and connected to a corresponding pole ear.

[0065] In the above-mentioned battery, the substrate includes two first sub-substrates arranged along the second direction and electrically connected. Each first sub-substrate is arranged in a first bending section and connected to the corresponding pole ear so as to avoid two adjacent convex corners, which is beneficial to reduce the risk of interference between the two adjacent convex corners and the substrate, and further facilitates placing the circuit board assembly on one side of the two battery cells.

[0066] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0067] Example 1 Please also read Figure 1 and Figure 2 One embodiment of the present application provides a battery 100A. The battery 100A may be, but is not limited to, a secondary battery. A secondary battery refers to a battery that can be continuously used by activating active materials by charging after the battery is discharged.

[0068] 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. When viewed along the first direction X, the two battery cells 10 are arranged along a second direction Y, and the circuit board assembly 20 is disposed on one side of the two battery cells 10 along a third direction Z. 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.

[0069] Please also read Figure 1 and Figure 2 The battery cell 10 includes a main body 11, a packaging part 12 and a tab 13. The main body 11 and the packaging part 12 are made of a packaging film by punching, folding and heat sealing. The main body 11 is the part where the packaging film is provided with a punching position, and the packaging part 12 is the part where the packaging film overlaps and is joined.

[0070] The main body 11 includes a top wall 111, a first wall 112, a second wall 113 and two side walls 114. The top wall 111 is disposed adjacent to the circuit board assembly 20. The first wall 112 and the second wall 113 are disposed opposite to each other along a first direction X and connected to the top wall 111, and the two side walls 114 are disposed opposite to each other along a second direction Y and connected to the top wall 111.

[0071] The packaging portion 12 includes a top sealing portion 121 and two side sealing portions 122 . The top sealing portion 121 is connected to the top wall 111 , and each side sealing portion 122 is connected to one side wall 114 .

[0072] The top seal portion 121 includes a bending portion 121A and a root portion 121B connected between the bending portion 121A and the top wall 111. The top wall 111 includes a first top surface 111A located between the root portion 121B and the first wall 112. The bending portion 121A is bent toward the first top surface 111A to reduce the space occupied by the top seal portion 121 in the third direction Z. Specifically, the bending portion 121A includes a first bending section 1211 and a second bending section 1212 connected to both ends of the first bending section 1211 along the second direction Y. The first bending section 1211 is arranged opposite to the first top surface 111A along the third direction Z, and the second bending section 1212 extends from the first bending section 1211 along the third direction Z in a direction away from the top wall 111.

[0073] The tab 13 extends from the bent portion 121A to facilitate electrical connection with the circuit board assembly 20. Specifically, the tab 13 extends from the side of the first bent section 1211 away from the root 121B.

[0074] The side seal portion 122 is bent in a direction toward the first wall 112 and includes a side seal extension portion 122A protruding from the top wall 111 along the third direction Z. The side seal extension portion 122A is connected to the bent portion 121A. Specifically, the side seal extension portion 122A is connected to the second bent section 1212 to form a convex corner portion 12A.

[0075] Please continue reading Figure 1 and Figure 2The circuit board assembly 20 includes a substrate 21. The substrate 21 includes two first sub-substrates 211 arranged along the second direction Y and electrically connected. Each first sub-substrate 211 is disposed at a first bending section 1211 and connected to a corresponding pole ear 13, so as to avoid two adjacent convex corner portions 12A, which is beneficial to reduce the risk of interference between the two adjacent convex corner portions 12A and the substrate 21, thereby facilitating the placement of the circuit board assembly 20 on one side of the two battery cells 10.

[0076] In some embodiments, the first sub-substrate 211 is located between the two convex corner portions 12A of the battery cell 10 along the second direction Y. The first sub-substrate 211 and the convex corner portions 12A share the space in the third direction Z, which can reduce the space occupied by the substrate 21 in the third direction Z, and is beneficial to increasing the volume of the main body 11 to improve the capacity and energy density of the battery 100A.

[0077] Please continue reading Figure 1 and Figure 2 , the circuit board assembly 20 includes a first flexible circuit board 22, a second flexible circuit board 23 and a first protective device 24. The first flexible circuit board 22 includes a first connection portion 221 and two second connection portions 222. Along the third direction Z, the first connection portion 221 is arranged on a side away from the top wall 111 of two adjacent convex corner portions 12A. Along the second direction Y, the two second connection portions 222 are arranged at both ends of the first connection portion 221, and each second connection portion 222 is connected to a first sub-substrate 211, so that the two first sub-substrates 211 are electrically connected through the first flexible circuit board 22, and the circuit board assembly 20 avoids the two adjacent convex corner portions 12A through the first flexible circuit board 22.

[0078] The second flexible circuit board 23 extends from the first flexible circuit board 22 in a direction away from the top wall 111. When viewed along the first direction X, the second flexible circuit board 23 is separated from the battery cell 10, and the second flexible circuit board 23 is configured to be electrically connected to an external circuit. Optionally, the external circuit is a mainboard of an external terminal device.

[0079] The first protection device 24 is used to construct a protection circuit, which can provide, but is not limited to, protection functions such as overcharge, over-discharge, overcurrent, short circuit and anti-counterfeiting for the battery cell 10. The first protection device 24 is disposed on the second flexible circuit board 23 so that the first protection device 24 is away from the top seal portion 121, so that the first protection device 24 can use the space of the receiving cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly 20 at the head of the battery 100A, which is conducive to improving the energy density of the battery 100A.

[0080] In addition, the existing battery structure usually sets the protection device on the substrate, and the flexible circuit board connected to the substrate needs to set up additional connection lines electrically connected to the protection device in addition to the overcurrent line. By setting the first protection device 24 on the second flexible circuit board 23, the number of connection lines required on the first flexible circuit board 22 can be reduced, which is conducive to the layout of the overcurrent line on the first flexible circuit board 22, and further helps to improve the overcurrent capacity of the first flexible circuit board 22.

[0081] Please continue reading Figure 2 In some embodiments, along the first direction X, the width of the first flexible circuit board 22 is L1, and the thickness of the battery cell 10 is L2. L1≤L2, so as to reduce the space waste caused by the first flexible circuit board 22 protruding from the battery cell 10 along the first direction X.

[0082] In some embodiments, 2mm≤L1≤6mm, when L1 is too small (less than 2mm), the first flexible circuit board 22 may fail to meet the overcurrent requirement; when L1 is too large (greater than 6mm), the first flexible circuit board 22 may protrude from the battery cell 10 along the first direction X. By limiting 2mm≤L1≤6mm, the overcurrent capacity of the first flexible circuit board 22 is improved, and the space waste caused by the first flexible circuit board 22 protruding from the battery cell 10 along the first direction X is reduced.

[0083] Optionally, L1 is 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, and any other value satisfying the range of 2 mm ≤ L1 ≤ 6 mm.

[0084] In some embodiments, the first flexible circuit board 22 includes a conductive copper layer, and the number of the conductive copper layer is 2, so as to facilitate bending of the first flexible circuit board 22 .

[0085] It should be noted that the first flexible circuit board 22 is a rectangular sheet structure when in the unfolded state, and the width of the sheet structure is L1, and correspondingly, the widths of the first connection portion 221 and the two second connection portions 222 are equal and are both L1. The thickness of each part of the sheet structure is equal, and correspondingly, the thickness of the first connection portion 221 and the two second connection portions 222 are equal.

[0086] In some embodiments, along the third direction Z, there is a height difference L3 between the first connection portion 221 and the first sub-substrate 211. The second connection portion 222 extends from the first connection portion 221 in a direction toward the top wall 111, and along the second direction Y, the second connection portion 222 is disposed opposite to two adjacent convex corner portions 12A, so that the first flexible circuit board 22 forms an inverted "U"-shaped structure, which is beneficial for the first flexible circuit board 22 to avoid the two adjacent convex corner portions 12A.

[0087] Please continue reading Figure 2In some embodiments, the first sub-substrate 211 includes a third flexible circuit board 2111 and a reinforcement plate 2112, and the third flexible circuit board 2111 and the reinforcement plate 2112 are stacked along the third direction Z. The third flexible circuit board 2111 is electrically connected to the corresponding tab 13 of the battery cell 10. The second connecting portion 222 is connected to the third flexible circuit board 2111, and the first flexible circuit board 22 is integrally arranged with the two third flexible circuit boards 2111 to improve the stability of the electrical connection between the first flexible circuit board 22 and the two first sub-substrates 211. The reinforcement plate 2112 is used to support the third flexible circuit board 2111 to improve the structural stability of the third flexible circuit board 2111.

[0088] Optionally, the reinforcing plate 2112 is disposed on a surface of the third flexible circuit board 2111 close to the top wall 111 , or the reinforcing plate 2112 is disposed on a surface of the third flexible circuit board 2111 away from the top wall 111 .

[0089] It is understandable that, in some embodiments, the reinforcing plate 2112 is replaced by a PCB board.

[0090] Please continue reading Figure 2 In some embodiments, the first protection device 24 includes a first PCB board 241 and a first electronic component 242. The second flexible circuit board 23 includes a first portion 231, a second portion 232 and a third portion 233. The first portion 231 is connected to the substrate 21 or the first flexible circuit board 22, and the first portion 231 extends in a direction away from the top wall 111. The second portion 232 is connected to an end of the first portion 231 away from the top wall 111, the first PCB board 241 is disposed on the second portion 232, and the first electronic component 242 is disposed on a surface of the first PCB board 241 away from the second portion 232, so that the first protection device 24 is away from the top sealing portion 121. The third portion 233 is connected to the second portion 232 and is configured to be electrically connected to an external circuit.

[0091] In some embodiments, the third portion 233 is provided with a connector 2331 and a reinforcement piece 2332 on both side surfaces in the thickness direction thereof, respectively. The connector 2331 is configured to be electrically connected to an external circuit, and the reinforcement piece 2332 is used to improve the structural strength of the third portion 233 .

[0092] In some embodiments, an adhesive 2321 is provided on one side of the second portion 232 away from the first PCB board 241, and the adhesive 2321 is used to bond with the structure in the accommodating cavity of the terminal device to stably fix the second portion 232 and the first protective device 24 in the accommodating cavity of the terminal device.

[0093] In some embodiments, in a direction perpendicular to the arrangement direction of the first portion 231 and the second portion 232, the width of the second portion 232 is greater than the width of the first portion 231, so as to increase the connection area between the second flexible circuit board 23 and the first PCB board 241, and facilitate reducing the space occupied by the circuit board assembly 20 at the head of the battery 100A.

[0094] In some embodiments, in a direction perpendicular to the arrangement direction of the second portion 232 and the third portion 233, the width of the second portion 232 is greater than the width of the third portion 233, so as to increase the connection area between the second flexible circuit board 23 and the first PCB board 241, and help reduce the risk of interference with other structures when the third portion 233 is connected to an external circuit.

[0095] Please also read Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 further includes an injection molding part 25 disposed on the second part 232, and the second part 232, the first PCB board 241 and the first electronic component 242 are located in the injection molding part 25. Specifically, the injection molding part 25 is formed on the outer side of the second part 232, the first PCB board 241 and the first electronic component 242 by melting the injection molding material through the injection molding equipment and then solidifying it. The injection molding part 25 is used to improve the anti-drop performance of the first protection device 24 and the second part 232. In addition, the injection molding part 25 can also contact with external structural parts such as the cavity wall of the accommodating cavity of the terminal device to transfer the heat generated by the first protection device 24 to the external structural parts, which is beneficial to reduce the temperature rise of the first protection device 24.

[0096] Optionally, the injection molding material includes at least one of polyamide, silicone resin and rubber.

[0097] See also Figure 3 In some embodiments, when observed along the arrangement direction of the second portion 232 and the first PCB board 241, the outer peripheral edge of the first PCB board 241 is located inside the outer peripheral edge of the injection molding portion 25, and the distance between the outer peripheral edge of the first PCB board 241 and the outer peripheral edge of the injection molding portion 25 is W1, 0.2mm≤W1≤0.5mm, so as to reduce the risk of the injection molding portion 25 being too thin and easily damaged, and reduce the space waste caused by the injection molding portion 25 protruding too much relative to the second portion 232.

[0098] Optionally, W1 is one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm and any other value satisfying the range of 0.2 mm≤W1≤0.5 mm.

[0099] It should be noted that a plurality of measuring points are set between the outer peripheral edge of the second portion 232 and the outer peripheral edge of the injection portion 25 to measure W1, and W1 corresponding to the plurality of measuring points may be equal or unequal to meet the production tolerance requirement.

[0100] See also Figure 4 In some embodiments, the first protection device 24 includes a second electronic component 243, and the second electronic component 243 is disposed on a surface of the first PCB board 241 away from the second portion 232. The second electronic component 243 is arranged at intervals from the first electronic component 242, and the first electronic component 242 and the second electronic component 243 are used to construct a protection circuit.

[0101] Along the arrangement direction of the second part 232 and the first PCB board 241, the height of the second electronic component 243 is H1, and the distance between the surface of the injection molding part 25 away from the first PCB board 241 and the first PCB board 241 is H2, H1≤H2. The surface of the injection molding part 25 away from the first PCB board 241 is provided with a recess 251, and the end face of the second electronic component 243 away from the first PCB board 241 is exposed from the recess 251, which is conducive to thinning the overall thickness of the second part 232, the first protective device 24 and the injection molding part 25. Specifically, during the injection molding process of the existing electronic component, a sufficient gap needs to be reserved between the end face of the electronic component and the injection molding equipment for the injection molding material to flow, and then the injection molding part is solidified between the end face of the electronic component and the injection molding equipment, which will cause the injection molding part to be thickened. By setting the recess 251, the second electronic component 243 is exposed in the injection molding part 25, which is conducive to thinning the overall thickness of the second part 232, the first protective device 24 and the injection molding part 25.

[0102] In some embodiments, 1 mm ≤ H2 ≤ 3 mm, so as to improve the structural strength of the injection-molded portion 25 and reduce the space waste caused by the injection-molded portion 25 being too thick.

[0103] Optionally, H2 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, and any other value within the range of 1mm≤H2≤3mm.

[0104] Please refer again Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 includes a first connector 26, which is disposed on a surface of the first sub-substrate 211 away from the top wall 111 and connected to the corresponding ear 13 of the battery cell 10, so that the first connector 26 and the convex corner portion 12A share the space in the third direction Z, which can reduce the space occupied by the circuit board assembly 20 at the head of the battery 100A, thereby facilitating improving the energy density of the battery 100A.

[0105] Optionally, the first connecting member 26 is a nickel sheet or a nickel block.

[0106] See also Figure 5 In some embodiments, the battery 100A includes a first buffer member 30. The first buffer member 30 includes a first buffer portion 31 and two second buffer portions 32. The two second buffer portions 32 are disposed at both ends of the first buffer portion 31 along the second direction Y. The first buffer portion 31 is disposed between the first flexible circuit board 22 and the two adjacent convex corner portions 12A to play a buffering role when the head of the battery 100A is impacted by an external force, thereby reducing the risk of damage to the first flexible circuit board 22 or the two adjacent convex corner portions 12A. The second buffer portion 32 is disposed between the first sub-substrate 211 and the first bending section 1211 to play a buffering role when the head of the battery 100A is impacted by an external force, thereby reducing the risk of damage to the first sub-substrate 211 or the first bending section 1211.

[0107] In some embodiments, the outer surface of the first buffer member 30 is adhesive to reduce the risk of the first buffer member 30 being misplaced.

[0108] Optionally, the first buffer member 30 is foam.

[0109] In some embodiments, the battery 100A includes a first protective member 40, which is disposed on the surface of the first buffer member 30 close to the circuit board assembly 20 to provide an anti-puncture function when the head of the battery 100A is impacted by external force, thereby reducing the risk of damage to the battery cell 10.

[0110] Specifically, the first protection member 40 includes a first protection portion 41 and two second protection portions 42, and the two second protection portions 42 are disposed at both ends of the first protection portion 41 along the second direction Y. The first protection portion 41 is disposed between the first flexible circuit board 22 and the first buffer portion 31, and the second protection portion 42 is disposed between the first sub-substrate 211 and the second buffer portion 32.

[0111] In some embodiments, the outer surface of the first protection member 40 is adhesive to reduce the risk of misalignment of the first buffer member 30 .

[0112] Optionally, the first buffer member 30 is DuPont paper.

[0113] In some embodiments, the battery 100A includes a second protective member 50, which is disposed on a side of the first sub-substrate 211 away from the top wall 111 to protect the portion where the first sub-substrate 211 is connected to the tab 13 and improve the stability of the electrical connection between the first sub-substrate 211 and the tab 13.

[0114] In some embodiments, the outer surface of the second protective member 50 is adhesive to reduce the risk of misalignment of the first buffer member 30 .

[0115] Optionally, the second protective member 50 is a silicone pad.

[0116] Furthermore, along the third direction Z, the projection of the first sub-substrate 211 is located within the projection range of the second protective member 50 to expand the protection range of the second protective member 50 and facilitate protection of the second protective member 50 against the surface of the first sub-substrate 211 away from the top wall 111 .

[0117] In some embodiments, the battery 100A includes a first insulating member 60 , which covers the convex corner portion 12A to improve the insulation stability between the convex corner portion 12A and the circuit board assembly 20 .

[0118] Optionally, the first insulating member 60 is a Mylar film.

[0119] Example 2 Please also read Figure 6 and Figure 7 One embodiment of the present application further provides a battery 100B. The difference between the battery 100B and the battery 100A is that the substrate 21 is provided with a second protection device 27 .

[0120] The circuit board assembly 20 includes a second protection device 27, which is arranged on a surface of the first sub-substrate 211 away from the top wall 111. The second protection device 27 and the first protection device 24 are electrically connected through the first sub-substrate 211, the first flexible circuit board 22 and the second flexible circuit board 23. The second protection device 27 and the first protection device 24 are used to construct a protection circuit.

[0121] In some embodiments, along the third direction Z, the height of the second protection device 27 is H3, H3≤L3, so as to reduce the space waste caused by the second protection device 27 protruding from the first connecting portion 221, which is beneficial to reducing the space occupied by the circuit board assembly 20 at the head of the battery 100B, and further beneficial to improving the energy density of the battery 100B.

[0122] By setting the first protection device 24 on the second flexible circuit board 23 and the second protection device 27 on the first sub-substrate 211, it is helpful to group and configure the protection devices according to factors such as the performance and size of the protection devices. Specifically, with L3 as the preset threshold, the protection device with a height greater than L3 is set as the first protection device 24 on the second flexible circuit board 23, and at least part of the protection device with a height less than L3 is set as the second protection device 27 on the first sub-substrate 211, so as to meet the protection circuit requirements while reducing the space occupied by the circuit board assembly 20 at the head of the battery 100B, which is beneficial to improve the energy density of the battery 100B.

[0123] In some embodiments, 0.1 mm≤H3≤0.5 mm, which helps to reduce the space waste caused by the second protection device 27 protruding out of the first connection portion 221.

[0124] Please continue reading Figure 6 and Figure 7 In some embodiments, the circuit board assembly 20 includes two first connectors 26 , which are spaced apart along the second direction Y, and the second protection device 27 is located between the two first connectors 26 for easy layout.

[0125] In some embodiments, the first connector 26 is a "U"-shaped nickel sheet. The first connector 26 includes a first section 261, a second section 262, and a third section 263. The first section 261 is disposed on a surface of the first sub-substrate 211 away from the top wall 111, the second section 262 is located on a side of the first section 261 away from the first sub-substrate 211 and is spaced apart from the first section 261 along the third direction Z, and the third section 263 is disposed between the first section 261 and the second section 262. The tab 13 includes a first extension section 131 extending along the first direction X, and the first extension section 131 is disposed between the first section 261 and the second section 262 to improve the stability of the connection between the first connector 26 and the tab 13.

[0126] Along the third direction Z, the sum of the thicknesses of the first section 261 , the second section 262 and the first extension section 131 is H4, H3≤H4, so as to reduce the risk of the second protection device 27 protruding out of the first connecting member 26 and interfering with other structural members (such as the second protective member 50 ).

[0127] Except for the above differences, the parameters of the battery 100B and the battery 100A are substantially the same, and reference may be made to the description of the battery 100A above.

[0128] Example 3 Please also read Figure 8 One embodiment of the present application further provides a battery 100C. The difference between the battery 100C and the battery 100A lies in the structure of the circuit board assembly 20.

[0129] Please also read Fig. 9 and Fig.10, the first sub-substrate 211 is located between the two convex corners 12A of the battery cell 10 along the second direction Y. The substrate 21 includes a second sub-substrate 212, and along the first direction X, the second sub-substrate 212 is located on the side of the two adjacent convex corners 12A close to the first wall 112, and the second sub-substrate 212 and the first top surface 111A are arranged opposite to each other along the third direction Z to avoid the two convex corners 12A. Along the second direction Y, the two first sub-substrates 211 are respectively connected to the two ends of the second sub-substrate 212, and each first sub-substrate 211 is arranged opposite to the first bending section 1121 of a battery cell 10 along the third direction Z. The second sub-substrate 212 is integrally arranged with the two first sub-substrates 211. The substrate 21 and the convex corners 12A share the space in the third direction Z, which can reduce the space occupied by the substrate 21 in the third direction Z, which is conducive to increasing the volume of the main body 11 to increase the capacity of the battery 100C.

[0130] Please also read Fig.10 and Fig.11 In some embodiments, along the first direction X, the distance between the first bending section 1211 and the first wall 112 is D1, and the distance between two adjacent side sealing extensions 122A and the first wall 112 is D2, D1<D2, so as to reduce the risk of interference between the side sealing extensions 122A and the second sub-substrate 212, and facilitate increasing the size of the second sub-substrate 212 along the first direction X, which is beneficial to improving the structural strength and current flow capacity of the second sub-substrate 212.

[0131] It should be noted that D1 is measured in the following manner: multiple measuring points are selected on the side of the first bending section 1211 away from the root 121B, and the spacing value between each measuring point and the first wall 112 along the first direction X is measured, and the average value of the multiple spacing values ​​is D1. D2 is measured in the following manner: one of the two adjacent side seal extensions 122A closer to the first wall 112 is used as the measurement target, and multiple measuring points are selected on the side of the side seal extension 122A close to the first wall 112, and the spacing value between each measuring point and the first wall 112 along the first direction X is measured, and the average value of the multiple spacing values ​​is D2.

[0132] In some embodiments, 0.15mm≤D2-D1≤0.25mm. When D2-D1 is too small (less than 0.15mm), the side seal extension 122A is likely to interfere with the second sub-substrate 212. When D2-D1 is too large (greater than 0.25mm), the side seal extension 122A is likely to lose a large packaging area, resulting in reduced packaging strength. By limiting 0.15mm≤D2-D1≤0.25mm, the risk of interference between the side seal extension 122A and the second sub-substrate 212 is reduced, and the packaging strength of the side seal extension 122A is improved.

[0133] Optionally, D2-D1 is 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 satisfying the range of 0.15mm≤D2-D1≤0.25mm.

[0134] In some embodiments, the circuit board assembly 20 includes a third electronic component (not shown), which is configured to form a protection circuit for protecting the battery cell 10. Along the third direction Z, the width of the second bending section 1212 in the first direction X gradually decreases, that is, the space occupied by the second bending section 1212 in the first direction X decreases as it moves away from the top wall 111. The third electronic component is arranged on the surface of the first sub-substrate 211 close to the first bending section 1121 to increase the distance between the first sub-substrate 211 and the top wall 111 in the third direction Z, so that the first sub-substrate 211 avoids the larger part of the second bending section 1212, thereby reducing the risk of interference between the second bending section 1212 and the substrate 21.

[0135] Please continue reading Fig.10 In some embodiments, along the first direction X, the width of the second sub-base 212 is W2, 1mm≤W2≤4mm, D2≥W2, 1.5mm≤D2≤4.5mm. When W2 is too small (less than 1mm), the structural strength and flow capacity of the second sub-base 212 are likely to be weak, and the temperature rise of the second sub-base 212 is likely to be aggravated during the use of the substrate 21; when W2 is too large (greater than 4mm or greater than D2), the second sub-base 212 is likely to protrude from the first wall 112 along the first direction X, resulting in space waste. By limiting 1mm≤W2≤4mm and D2≥W2, it is beneficial to improve the structural strength and flow capacity of the second sub-base 212, reduce the temperature rise of the second sub-base 212 during the use of the substrate 21, and improve the space utilization rate of the second sub-base 212 on the top wall 111.

[0136] Optionally, W2 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or any other value in the range of 1 mm ≤ W2 ≤ 4 mm. D2 is 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or any other value in the range of 1.5 mm ≤ D2 ≤ 4.5 mm.

[0137] Please continue reading Fig.10In some embodiments, along the second direction Y, the length of the second sub-substrate 212 is L4, 3mm≤L4≤12mm. When L4 is too small (less than 3mm), the first sub-substrate 211 is likely to interfere with the convex corner portion 12A; when L4 is too large (greater than 12mm), the fabric area of ​​the first sub-substrate 211 is likely to be reduced. By limiting 3mm≤L4≤12mm, the risk of interference between the first sub-substrate 211 and the convex corner portion 12A is reduced, and the fabric area of ​​the first sub-substrate 211 is easily increased.

[0138] Optionally, L4 is 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, and any other value within the range of 3mm≤L4≤12mm.

[0139] Please refer again Fig.11 In some embodiments, along the third direction Z, the height of the side seal extension portion 122A is H5, and H5 ≥ 1.5 mm, so as to improve the packaging strength of the side seal extension portion 122A.

[0140] Optionally, H5 is 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, and any other value satisfying the range of H5 ≥ 1.5 mm.

[0141] Please also read Fig.10 and Fig.11 In some embodiments, the side seal extension 122A is cut to form a notch so that the side seal extension 122A avoids the second sub-substrate 212. Specifically, a first notch 1221 is provided on the side of the side seal extension 122A close to the first wall 112, and a portion of the second sub-substrate 212 is located in the first notch 1221, so as to reduce the risk of interference between the side seal extension 122A and the second sub-substrate 212.

[0142] The first notch 1221 has a first edge 1222 and a second edge 1223. The first edge 1222 extends along the third direction Z and is disposed opposite to the second sub-substrate 212 along the first direction X. The second edge 1223 extends along the first direction X and is disposed opposite to the second sub-substrate 212 along the third direction Z.

[0143] The length of the first edge 1222 is L5, 1mm≤L5≤5mm. When L5 is too small (less than 1mm), the second edge 1223 is likely to interfere with the second sub-substrate 212. When L5 is too large (greater than 5mm), the side seal extension 122A is likely to lose a large packaging area, resulting in reduced packaging strength. By limiting 1mm≤L5≤5mm, the risk of interference between the second edge 1223 and the second sub-substrate 212 is reduced, and the packaging strength of the side seal extension 122A is improved.

[0144] Optionally, L5 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, and any other value satisfying the range of 1 mm ≤ L5 ≤ 5 mm.

[0145] Furthermore, L5 = H5, so as to further reduce the risk of interference between the second edge 1223 and the second sub-substrate 212 .

[0146] The length of the second edge 1223 is L6, 0.5mm≤L6≤3.5mm. When L6 is too small (less than 0.5mm), the first edge 1222 is likely to interfere with the second sub-substrate 212; when L6 is too large (greater than 3.5mm), the side seal extension 122A is likely to lose a large packaging area, resulting in reduced packaging strength. By limiting 0.5mm≤L6≤3.5mm, the risk of interference between the first edge 1222 and the second sub-substrate 212 is reduced, and the packaging strength of the side seal extension 122A is improved.

[0147] Optionally, L6 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 satisfying the range of 0.5 mm≤L6≤3.5 mm.

[0148] Please continue reading Fig.11 In some embodiments, along the first direction X, the distance between the first edge 1222 and the side edge of the side seal extension 122A away from the first wall 112 is D3, 1.5mm≤D3≤4.5mm. When D3 is too small (less than 1.5mm), the side seal extension 122A may lose a large packaging area, resulting in reduced packaging strength. When D3 is too large (greater than 4.5mm), the first edge 1222 may interfere with the second sub-substrate 212. By limiting 1.5mm≤D3≤4.5mm, the risk of interference between the first edge 1222 and the second sub-substrate 212 is reduced, and the packaging strength of the side seal 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 satisfying the range of 1.5 mm≤D3≤4.5 mm.

[0150] Please also read Fig.12 and Fig.13 In some embodiments, the top wall 111 includes a second top surface 111B located between the root portion 121B and the second wall 113. Optionally, the first top surface 111A is a deep pit surface of the battery 100C, and the second top surface 111B is a shallow pit surface of the battery 100C.

[0151] The battery 100C includes a second insulating member 71. The second insulating member 71 includes a first insulating portion 711, a second insulating portion 712 and a third insulating portion 713. Along the third direction Z, the first insulating portion 711 is arranged on the side of the two adjacent convex corner portions 12A away from the top wall 111, and the second insulating portion 712 and the third insulating portion 713 are connected to both sides of the first insulating portion 711 along the first direction X. When viewed along the third direction Z, the first insulating portion 711 covers the two adjacent convex corner portions 12A. When viewed along the first direction X, the second insulating portion 712 covers the gap between the two first top surfaces 111A and the two adjacent convex corner portions 12A, and the third insulating portion 713 covers the gap between the two second top surfaces 111B and the two adjacent convex corner portions 12A. The second insulating member 71 can improve the insulation stability between the two adjacent convex corner portions 12A and other structural members.

[0152] Optionally, the second insulating member 71 is DuPont paper.

[0153] In some embodiments, the battery 100C includes an injection molded part 80, the injection molded part 80 connects the second insulating part 71 and the area where the top wall 111 is separated from the second insulating part 71, and the injection molded part 80 covers the top seal 121, the tab 13 and the substrate 21. Specifically, the injection molded part 80 is formed in a set area by melting the injection material through the injection molding equipment and then solidifying. The second insulating part 71 can reduce the risk of the injection material penetrating into the gap between the two battery cells 10 during the injection molding process.

[0154] Please also read Fig.12 and Fig.14 In some embodiments, the battery 100C includes a third insulating member 72 , which is bonded between the first top surface 111A and the bent portion 121A to improve the structural stability of the top sealing portion 121 on the top wall 111 .

[0155] Optionally, the third insulating member 72 is a glue layer.

[0156] Please continue reading Fig.12 and Fig.14In some embodiments, the battery 100C includes a fourth insulating member 73, which is bonded to the second top surface 111B and the side of the bent portion 121A away from the first top surface 111A. The fourth insulating member 73 is located between the bent portion 121A and the substrate 21 to improve the insulation stability between the top sealing portion 121 and the substrate 21.

[0157] Optionally, the fourth insulating member 73 is DuPont paper.

[0158] Please refer again Fig.12 and Fig.13 In some embodiments, the thickness direction of the substrate 21 is parallel to the third direction Z. The first sub-substrate 211 includes a first surface 211A, a second surface 211B, a third surface 211C, and a fourth surface 211D. The first surface 211A and the second surface 211B are arranged opposite to each other along the third direction Z, and the first surface 211A is close to the top wall 111, and the second surface 211B is far from the top wall 111. The third surface 211C and the fourth surface 211D are arranged opposite to each other along the first direction X, and the third surface 211C is close to the first wall 112, and the fourth surface 211D is close to the second wall 113.

[0159] The circuit board assembly 20 includes a second connector 28, which is connected to the first sub-baseboard 211. The second connector 28 is connected to the tab 13 and forms a joint 28A, which is located on the third surface 211C. The joint 28A and the baseboard 21 share a space in the third direction Z, which is beneficial to improve the space utilization of the circuit board assembly 20 on the top wall 111.

[0160] Please continue reading Fig.12In some embodiments, the third surface 211C includes a first body surface 2113, a first concave surface 2114, and a first connection surface 2115. The first body surface 2113 is connected to the second sub-substrate 212, and the first concave surface 2114 is located on the side of the first body surface 2113 away from the second sub-substrate 212. Along the first direction X, the distance between the first body surface 2113 and the first wall 112 is D5, and the distance between the first concave surface 2114 and the first wall 112 is D6, D5<D6, and 0.2mm≤D6-D5≤0.8mm. The first connection surface 2115 is connected between the first body surface 2113 and the first concave surface 2114. Along the first direction X, the combination portion 28A is located on the first concave surface 2114, and along the second direction Y, the combination portion 28A overlaps with the first connection surface 2115. The joint portion 28A and the substrate 21 share the space in the first direction X and the second direction Y, which is beneficial 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 portion 28A can use the accommodation space formed by the first concave surface 2114 and the first connecting surface 2115, and reduce the impact on the layout area of ​​the first sub-substrate 211.

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

[0162] Please also read Fig.12 and Fig.14 In some embodiments, the second connecting member 28 is an "L"-shaped nickel sheet. The second connecting member 28 includes a first section 281, a second section 282, and a third section 283. The first section 281 is connected to the first surface 211A, the third section 283 is spaced apart from the third surface 211C along the first direction X, and the second section 282 is bent and connected between the first section 281 and the third section 283. Specifically, the third section 283 is spaced apart from the first concave surface 2114 along the first direction X.

[0163] The tab 13 includes 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 third section 283 away from the third surface 211C along the first direction X, the third extension section 133 is located on the side of the third section 283 away from the first top surface 111A along the third direction Z, and the fourth extension section 134 is located between the third section 283 and the third surface 211C along the first direction X and connects the third section 283. The fourth extension section 134 is connected to the third section 283 to form a joint portion 28A, which is conducive to improving the stability of the connection between the second connecting member 28 and the tab 13.

[0164] Please continue reading Fig.12 In some embodiments, when viewed along the third direction Z, the fourth surface 211D is provided with a third notch 2116 , and the injection molded part 80 is filled in the third notch 2116 , so that the injection molding material can penetrate into the area where the top wall 111 and the second insulating part 71 are separated during the injection molding process.

[0165] Please refer again Figure 8 and Fig. 9 In some embodiments, the circuit board assembly 20 includes a second flexible circuit board 23, the second flexible circuit board 23 is connected to the substrate 21, and the second flexible circuit board 23 is configured to be electrically connected to an external circuit. The injection molded part 80 covers the portion where the second flexible circuit board 23 is connected to the substrate 21 to improve the stability of the connection between the second flexible circuit board 23 and the substrate 21.

[0166] Optionally, a concave portion 81 is provided on a surface of the injection molded part 80 away from the top wall 111 , and the second flexible circuit board 23 extends out from the concave portion 81 , which is beneficial to expand the movable angle of the second flexible circuit board 23 .

[0167] Except for the above differences, the parameters of the battery 100C and the battery 100A are substantially the same, and reference may be made to the description of the above battery 100A.

[0168] Example 4 Please also read Fig.15 and Fig.16 One embodiment of the present application further provides a battery 100D. The difference between the battery 100D and the battery 100C is 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 portion 121B, and the first side edge 121C is provided with a second notch 1213. Along the second direction Y, the second notch 1213 is close to two adjacent side seal extension portions 122A. 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 second sub-base 212 along the third direction Z. When viewed along the first direction X, the fourth edge 1215 extends from the third edge 1214 in a direction away from the top wall 111. Along the first direction X, the second sub-base 212 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. The second notch 1213 is provided to reduce the space occupied by the second bending section 1212 in the first direction X, thereby reducing the risk of interference between the second bending section 1212 and the substrate 21 .

[0170] Except for the above differences, the parameters of the battery 100D and the battery 100C are substantially the same, and reference may be made to the description of the battery 100C above.

[0171] Example 5 See also Fig.17 One embodiment of the present application further provides a battery 100E. The difference between the battery 100E and the battery 100C is that the side seal extension portion 122A is not cut to form a notch.

[0172] 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. Along 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, that is, the side seal extension portion 122A is not cut to form a notch.

[0173] Along the first direction X, the distance between two adjacent side sealing extensions 122A and the first wall 112 is D2, 1.5mm≤D2≤4.5mm, so that the second sub-substrate 212 is located on the side of the two adjacent side sealing extensions 122A close to the first wall 112, and the second sub-substrate 212 is arranged opposite to the first top surface 111A along the third direction Z.

[0174] It should be noted that the battery 100E is suitable for batteries with a relatively thick thickness, and the batteries 100C and 100D are suitable for batteries with a relatively thin thickness.

[0175] Except for the above differences, the parameters of the battery 100E and the battery 100C are substantially the same, and reference may be made to the description of the battery 100C above.

[0176] Example 6 Please also read Fig.18 and Fig.19 One embodiment of the present application further provides a battery 100F. The difference between the battery 100F and the battery 100C lies in the connection structure between the second connector 28 and the tab 13.

[0177] The second connecting member 28 includes a first section 281, a second section 282, a third section 283, a fourth section 284 and a fifth section 285. The first section 281 is connected to the first surface 211A, the third section 283 is spaced apart from the third surface 211C along the first direction X, the second section 282 is bent and connected between the first section 281 and the third section 283, the fifth section 285 is located on a side of the third section 283 away from the third surface 211C along the first direction X, and the fourth section 284 is bent and connected between the third section 283 and the fifth section 285.

[0178] The tab 13 includes a first extension section 131, a second extension section 132, a third extension section 133 and a fourth extension section 134 which are connected in sequence. The first extension section 131 extends from the bending portion 121A, the second extension section 132 is located on a side of the fifth section 285 away from the third section 283 along the first direction X and is connected to the fifth section 285, the third extension section 133 is located on a side of the fourth section 284 away from the first top surface 111A along the third direction Z, and the fourth extension section 134 is located between the third section 283 and the third surface 211C along the first direction X and is connected to the third section 283. The fourth extension section 134 is connected to the third section 283 and the second extension section 132 is connected to the fifth section 285 to form a joint portion 28A, which is conducive to improving the stability of the connection between the second connector 28 and the tab 13.

[0179] See also Fig. 20 In some embodiments, the fourth section 284 includes a first subsection 284A and a second subsection 284B spaced apart along the second direction Y, and a gap 284C penetrating the second connecting member 28 is provided between the first subsection 284A and the second subsection 284B to facilitate bending of the fourth section 284.

[0180] Except for the above differences, the parameters of the battery 100F and the battery 100C are substantially the same, and reference may be made to the description of the battery 100C above.

[0181] Example 7 Please also read Fig.21 and Fig. 22 One embodiment of the present application further provides a battery 100G. The difference between the battery 100G and the battery 100C lies in the connection structure between the second connector 28 and the tab 13.

[0182] The second connecting member 28 is a nickel block and is located on the third surface 211C.

[0183] The tab 13 includes 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 bent portion 121A, the second extension section 132 is located on one side of the second connector 28 along the first direction X and connected to the second connector 28, and the third extension section 133 is stacked on the second surface 211B. The second extension section 132 is connected to the second connector 28 to form a joint portion 28A, which is conducive to improving the stability of the connection between the second connector 28 and the tab 13.

[0184] It can be understood that, in some embodiments, the third surface 211C is provided with a pad, and the second extension section 132 is welded and connected to the pad of the third surface 211C.

[0185] It can be understood that, in some embodiments, the second surface 211B is provided with a pad, the second extension section 132 is located on one side of the third surface 211C along the first direction X, and the second extension section 132 is welded and connected to the pad on the second surface 211B.

[0186] Except for the above differences, the parameters of battery 100G and battery 100C are substantially the same, and reference may be made to the description of battery 100C above.

[0187] Example 8 Please also read Fig.23 and Fig.24 One embodiment of the present application further provides a battery 100H. The difference between the battery 100H and the battery 100C lies in the connection structure between the second connector 28 and the tab 13.

[0188] The second connecting member 28 is located on the first surface 211A. The second connecting member 28 is a "U"-shaped nickel sheet. The second connecting member 28 includes a first section 281, a second section 282 and a third section 283. The first section 281 is connected to the first surface 211A, the third section 283 is spaced apart from the first section 281 along the third direction Z, and the second section 282 is bent and connected between the first section 281 and the third section 283.

[0189] The tab 13 includes 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 bent portion 121A, the third extension section 133 is located between the first section 281 and the third section 283 and connected to the first section 281, and the second extension section 132 is bent and connected between the first extension section 131 and the third extension section 133, which is conducive to improving the stability of the connection between the second connector 28 and the tab 13.

[0190] Except for the above differences, the parameters of the battery 100H and the battery 100C are substantially the same, and reference may be made to the description of the battery 100C above.

[0191] Example 9 Please also read Fig.25 and Fig.26 One embodiment of the present application further provides a battery 100I. The difference between the battery 100I and the battery 100A lies in the structure of the circuit board assembly 20.

[0192] The first sub-substrate 211 is located between the two convex corners 12A of the battery cell 10 along the second direction Y. The circuit board assembly 20 includes a fourth flexible circuit board 29. The fourth flexible circuit board 29 includes a third connection portion 291 and two fourth connection portions 292, and the third connection portion 291 extends from the second wall 113 of one of the battery cells 10 to the second wall 113 of the other battery cell 10. Along the second direction Y, the two fourth connection portions 292 are arranged at both ends of the third connection portion 291, and are electrically connected to a corresponding first sub-substrate 211, so that the two first sub-substrates 211 are electrically connected through the fourth flexible circuit board 29, and the circuit board assembly 20 avoids the two adjacent convex corners 12A through the fourth flexible circuit board 29. The fourth flexible circuit board 29 is arranged on the second wall 113, which can reduce the space occupied by the circuit board assembly 20 at the head of the battery 100I, which is conducive to improving the energy density of the battery 100I.

[0193] In some embodiments, when viewed along the first direction X, the third connection portion 291 extends along the second direction Y, and the fourth connection portion 292 extends along the third direction Z. The fourth flexible circuit board 29 has a "U"-shaped structure so that both ends of the fourth flexible circuit board 29 are evenly stressed.

[0194] In some embodiments, the top wall 111 includes a second top surface 111B between the root 121B and the second wall 113. Along the first direction X, the width of the first top surface 111A is W3, and the width of the second top surface 111B is W4, W3>W4, that is, the first top surface 111A is a deep pit surface of the battery 100I, and the second top surface 111B is a shallow pit surface of the battery 100I.

[0195] See also Fig. 27 In some embodiments, the battery 100 further includes a wrapping film 90, which connects the second walls 113 of the two battery cells 10. When viewed along the first direction X, the wrapping film 90 is spaced apart from the fourth flexible circuit board 29, so that the fourth flexible circuit board 29 and the wrapping film 90 share the space in the first direction X, which is beneficial to improving the energy density of the battery 100I.

[0196] Optionally, the wrapping film 90 is an adhesive layer or an easy-tear sticker.

[0197] It can be understood that, in some embodiments, a portion of the terminal device corresponding to the fourth flexible circuit board 29 is provided with an avoidance groove, so that the fourth flexible circuit board 29 can utilize the space of the terminal device.

[0198] Except for the above differences, the parameters of the battery 100I and the battery 100A are substantially the same, and reference may be made to the description of the above battery 100A.

[0199] Example 10 Please also read Fig.28 and Fig.29One embodiment of the present application further provides a battery 100J. The battery 100J differs from the battery 100A in the structure of the packaging portion 12 of the battery cell 10 and the structure of the circuit board assembly 20.

[0200] The substrate 21 includes a third sub-substrate 213. Along the third direction Z, the third sub-substrate 213 is disposed on a side of two adjacent convex corner portions 12A away from the top wall 111. Along the second direction Y, the two first sub-substrates 211 are disposed at both ends of the third sub-substrate 213, and the third sub-substrate 213 is integrally disposed with the two first sub-substrates 211. Observed along the first direction X, the substrate 21 is located on a side of two adjacent convex corner portions 12A away from the top wall 111.

[0201] Please also read Fig.29 and Fig.30 A first cut corner 14 is provided at the intersection of the side seal extension 122A and the second bending section 1212, and the first cut corner 14 includes a first side 141 and a second side 142. The first side 141 is located at the side seal extension 122A, and the second side 142 is located at the second bending section 1212. Along the third direction Z, the first side 141 and the second side 142 intersect at the vertex 143 of the convex corner portion 12A away from the top wall 111. The distance between the vertex 143 and the top wall 111 is H6, 0.5mm≤H6≤1.5mm. The first cut corner 14 is used to reduce the height of the convex corner portion 12A, so as to reduce the space occupied by the substrate 21 in the third direction Z, which is conducive to increasing the volume of the main body 11 to improve the capacity and energy density of the battery 100J.

[0202] It is understandable that when H6 is too small (less than 0.5 mm), the packaging strength of the convex corner portion 12A is likely to be reduced.

[0203] Optionally, H6 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, and any other value satisfying the range of 0.5 mm ≤ H6 ≤ 1.5 mm.

[0204] Please refer again Fig.29 and Fig.30 In some embodiments, the circuit board assembly 20 includes a fourth electronic component 201, and the fourth electronic component 201 is disposed on the surface of the first sub-substrate 211 close to the first bending section 1211, so that the fourth electronic component 201 and the convex corner portion 12A share the space in the third direction Z, which can reduce the space occupied by the circuit board assembly 20 in the third direction Z, and is beneficial to increase the volume of the main body 11 to improve the capacity and energy density of the battery 100J.

[0205] In some embodiments, the circuit board assembly 20 includes a third connecting member 202, which is disposed on a surface of the first sub-substrate 211 away from the first bending section 1211 and connected to the corresponding electrode ear 13 of the battery cell 10 to reduce the risk of interference between the third connecting member 202 and the fourth electronic component 201 for easy layout.

[0206] It can be understood that, in some embodiments, the circuit board assembly 20 includes a third connecting member 202, which is arranged on the surface of the first sub-substrate 211 close to the first bending section 1211 and connected to the corresponding electrode ear 13 of the battery cell 10, so that the third connecting member 202 and the convex corner portion 12A share the space in the third direction Z, which can reduce the space occupied by the circuit board assembly 20 in the third direction Z, and thus help to improve the energy density of the battery 100J.

[0207] Except for the above differences, the parameters of the battery 100J and the battery 100A are substantially the same, and reference may be made to the description of the above battery 100A.

[0208] Embodiment 11 See also Fig.31 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) in any of the above embodiments.

[0209] Optionally, the terminal device 200 can be a mobile phone, a tablet computer, a laptop computer, a smart wearable product (e.g., a smart watch, a smart bracelet), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or other device with a rechargeable battery.

[0210] Example 12 See also Fig.32 One embodiment of the present application further provides a terminal device 200B, including a mainboard 95, a battery 100K and a first protection device 96. The difference between the battery 100K and the battery 100A is that the first protection device 24 of the battery 100A is moved outward from the second flexible circuit board 23.

[0211] The circuit board assembly 20 includes a substrate 21, a first flexible circuit board 22, a second flexible circuit board 23 and a first protective device 24. The substrate 21 includes two first sub-substrates 211 arranged along the second direction Y and electrically connected, each of the first sub-substrates 211 is arranged at a first bending section 1211 and connected to the corresponding pole lug 13. The first flexible circuit board 22 includes a first connecting portion 221 and two second connecting portions 222. Along the third direction Z, the first connecting portion 221 is arranged on a side of two adjacent convex corner portions 12A away from the top wall 111. Along the second direction Y, two second connecting portions 222 are arranged at both ends of the first connecting portion 221, and each second connecting portion 222 is connected to a first sub-substrate 211, so that the two first sub-substrates 211 are electrically connected through the first flexible circuit board 22, and the circuit board assembly 20 avoids the two adjacent convex corner portions 12A through the first flexible circuit board 22.

[0212] The second flexible circuit board 23 extends from the first flexible circuit board 22 in a direction away from the top wall 111 . When viewed along the first direction X, the second flexible circuit board 23 is separated from the battery cell 10 . The second flexible circuit board 23 is configured to be electrically connected to an external circuit.

[0213] The first protection device 96 is disposed on the main board 95 and is configured to form a protection circuit with the circuit board assembly 20 to protect the battery cell 10, so as to reduce the space waste caused by disposing the protection circuit at the head of the battery 100K, which is beneficial to improve the energy density of the battery 100K. In addition, by disposing the first protection device 96 on the main board 95, the number of connection lines required on the first flexible circuit board 22 can be reduced, which is beneficial to the layout of the overcurrent circuit on the first flexible circuit board 22, and further beneficial to improve the overcurrent capacity of the first flexible circuit board 22.

[0214] In summary, in the above-mentioned batteries (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K) and terminal devices (200A, 200B), the substrate 21 includes two first sub-substrates 211 arranged along the second direction Y and electrically connected, and each first sub-substrate 211 is arranged in a first bending section 1211 and connected to the corresponding pole ear 13, so as to avoid two adjacent convex corner portions 12A, which is beneficial to reduce the risk of interference between the two adjacent convex corner portions 12A and the substrate 21, and further facilitates placing the circuit board assembly 20 on one side of the two battery cells 10.

[0215] In addition, those skilled in the art may also 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 in the present application.

Claims

1. A battery, characterized in that: The battery comprises: Two battery cells, the thickness direction of the two battery cells is the first direction, and when viewed along the first direction, the two battery cells are arranged along the second direction, the battery cell comprises a main body, a packaging portion and a pole ear, the main body 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 portion comprises a top sealing portion connected to the top wall and a side sealing portion connected to the side wall, the top sealing portion comprises a bending portion and a root portion connected between the bending portion and the top wall, the top wall comprises a first top surface located between the root and the first wall, the bending portion faces The first top surface is bent, the bent portion includes a first bent section and second bent sections connected to two ends of the first bent section along the second direction, the first bent section and the top wall are arranged opposite to each other along a third direction, the second bent section extends from the first bent section along the third direction in a direction away from the top wall, the pole ear extends from the first bent section, the side seal portion is bent in a direction toward the first wall, the side seal portion includes a side seal extension portion protruding from the top wall along the third direction, the side seal extension portion connects the second bent section to form a convex corner portion, and the first direction, the second direction and the third direction are perpendicular to each other; A circuit board assembly comprises a substrate, wherein the substrate comprises two first sub-substrates arranged along the second direction and electrically connected, and each of the first sub-substrates is arranged at one of the first bending sections and connected to the corresponding pole lug.

2. The battery according to claim 1, characterized in that The first sub-substrate is located between the two convex corners of the battery cell along the second direction; The circuit board assembly includes a first flexible circuit board, a second flexible circuit board and a first protective device. The first flexible circuit board includes a first connecting portion and two second connecting portions. Along the third direction, the first connecting portion is arranged on a side of two adjacent convex corner portions away from the top wall. Along the second direction, two second connecting portions are arranged at both ends of the first connecting portion, and each of the second connecting portions is connected to one of the first sub-substrates. The second flexible circuit board extends from the first flexible circuit board in a direction away from the top wall. When viewed along the first direction, the second flexible circuit board is separated from the battery cell. The second flexible circuit board is configured to be electrically connected to an external circuit. The first protective device is arranged on the second flexible circuit board.

3. The battery according to claim 2, characterized in that The first sub-substrate includes a third flexible circuit board and a reinforcing plate stacked along the third direction, the second connecting portion is connected to the third flexible circuit board, and the first flexible circuit board is integrally arranged with the two third flexible circuit boards.

4. The battery according to claim 2, characterized in that The first protection device includes a first PCB board and a first electronic component; The second flexible circuit board includes a first part, a second part and a third part, the first part is connected to the substrate or the first flexible circuit board, the first part extends in a direction away from the top wall, the second part is connected to an end of the first part away from the top wall, the first PCB board is arranged on the second part, the first electronic component is arranged on a surface of the first PCB board away from the second part, and the third part is connected to the second part and is configured to be electrically connected to an external circuit.

5. The battery according to claim 4, characterized in that The circuit board assembly further includes an injection molding portion disposed on the second portion, and the second portion, the first PCB board and the first electronic component are located in the injection molding portion.

6. The battery according to claim 2, characterized in that Along the third direction, there is a height difference L3 between the first connection portion and the first sub-substrate, the second connection portion extends from the first connection portion in a direction toward the top wall, and along the second direction, the second connection portion is arranged opposite to the two adjacent convex corner portions.

7. The battery according to claim 6, characterized in that The circuit board assembly includes a second protective device, which is disposed on a surface of the substrate away from the top wall. Along the third direction, a height of the second protective device is H3, where H3≤L3.

8. The battery according to claim 7, characterized in that The circuit board assembly includes two first connectors, which are arranged on the surface of the substrate away from the top wall and connected to the corresponding tabs of the battery cells. Along the second direction, the two first connectors are arranged at intervals, and the second protection device is located between the two first connectors.

9. The battery according to claim 1, characterized in that The first sub-substrate is located between the two convex corners of the battery cell along the second direction; The substrate includes a second sub-substrate, and along the first direction, the second sub-substrate is located on the side of the two adjacent convex corners close to the first wall, and the second sub-substrate and the first top surface are arranged opposite to each other along the third direction. Along the second direction, two first sub-substrates are respectively connected to the two ends of the second sub-substrate, each of the first sub-substrates is arranged opposite to the first bending section of one of the battery cells along the third direction, and the second sub-substrate is integrally arranged with the two first sub-substrates.

10. The battery according to claim 9, characterized in that Along the first direction, the distance between the first bending section and the first wall is D1, and the distance between two adjacent side seal extension portions and the first wall is D2, D1<D2, 0.15mm≤D2-D1≤0.25mm.

11. The battery according to claim 9, characterized in that A first notch is formed on a side of the side sealing extension portion close to the first wall, and a portion of the second sub-base plate is located in the first notch.

12. The battery according to claim 11, characterized in that The first notch has a first edge and a second edge, the first edge extends along the third direction and is arranged opposite to the second sub-substrate along the first direction, the second edge extends along the first direction and is arranged opposite to the second sub-substrate along the third direction, the length of the first edge is L5, 1mm≤L5≤5mm, and the length of the second edge is L6, 0.5mm≤L6≤3.5mm.

13. The battery according to claim 9 or 11, characterized in that The circuit board assembly includes a third electronic component, and the third electronic component is arranged on a surface of the first sub-substrate close to the first bending section.

14. The battery according to claim 9 or 11, characterized in that The bending portion comprises a first side away from the root portion, the first side is provided with a second notch, and along the second direction, the second notch is close to two adjacent side seal extension portions; The second notch has a third edge and a fourth edge, the third edge extends along the first direction and is arranged opposite to the second sub-substrate along the third direction, and when viewed along the first direction, the fourth edge extends from the third edge in a direction away from the top wall, and along the first direction, the second sub-substrate is arranged opposite to two adjacent fourth edges.

15. The battery according to claim 9 or 11, characterized in that The thickness direction of the substrate is parallel to the third direction, the first sub-substrate includes a first surface, a second surface, a third surface and a fourth surface, the first surface and the second surface are arranged opposite to each other along the third direction, the first surface is close to the top wall, the second surface is far from the top wall, the third surface and the fourth surface are arranged opposite to each other along the first direction, 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 second connector, the second connector is connected to the first sub-baseboard, the second connector is connected to the tab and forms a joint portion, and the joint portion is located on the third surface.

16. The battery according to claim 15, characterized in that The third surface includes a first body surface, a first concave surface and a first connecting surface, the first body surface is connected to the second sub-substrate, the first concave surface is located on a side of the first body surface away from the second sub-substrate, 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 combining portion is located on the first concave surface, and along the second direction, the combining portion overlaps with the first connecting surface.

17. The battery according to claim 10 or 12, characterized in that: The top wall includes a second top surface between the root portion and the second wall; The battery comprises a second insulating member, the second insulating member comprises a first insulating portion, a second insulating portion and a third insulating portion, along the third direction, the first insulating portion is arranged on a side of two adjacent convex corner portions away from the top wall, the second insulating portion and the third insulating portion are connected to two sides of the first insulating portion along the first direction, when viewed along the third direction, the first insulating portion covers two adjacent convex corner portions, when viewed along the first direction, the second insulating portion covers a gap between two first top surfaces and two adjacent convex corner portions, and the third insulating portion covers a gap between two second top surfaces and two adjacent convex corner portions; The battery includes an injection molded part, which connects the second insulating part and the area where the top wall is separated from the second insulating part, and the injection molded part covers the top sealing part, the tab and the substrate.

18. The battery according to claim 1, characterized in that The first sub-substrate is located between the two convex corners of the battery cell along the second direction; The circuit board assembly includes a fourth flexible circuit board, and the fourth flexible circuit board includes a third connecting portion and two fourth connecting portions, the third connecting portion extends from the second wall of one of the battery cells to the second wall of another battery cell, and along the second direction, the two fourth connecting portions are arranged at both ends of the third connecting portion and are electrically connected to a corresponding one of the first sub-substrates.

19. The battery according to claim 18, characterized in that The top wall includes a second top surface located between the root portion and the second wall, and along the first direction, the width of the first top surface is W3, the width of the second top surface is W4, and W3>W4; The battery includes a wrapping film, the wrapping film connects the second walls of the two battery cells, and when viewed along the first direction, the wrapping film is spaced apart from the fourth flexible circuit board.

20. The battery according to claim 1, characterized in that The substrate includes a third sub-substrate, and along the third direction, the third sub-substrate is arranged on a side of two adjacent convex corner portions away from the top wall, and along the second direction, two first sub-substrates are arranged at two ends of the third sub-substrate, and the third sub-substrate is integrally arranged with the two first sub-substrates; A first cut angle is provided at the intersection of the side seal extension portion and the second bending section, the first cut angle includes a first side and a second side, the first side is located at the side seal extension portion, the second side is located at the second bending section, and along the third direction, the first side and the second side intersect at the vertex of the convex corner portion away from the top wall, and the distance between the vertex and the top wall is H6, 0.5mm≤H6≤1.5mm.

21. The battery according to claim 20, characterized in that The circuit board assembly includes a third connector and a fourth electronic component. The third connector is arranged on the surface of the first sub-substrate close to the first bending section and connected to the corresponding tab of the battery cell. The fourth electronic component is arranged on the surface of the first sub-substrate close to the first bending section.

22. A terminal device, characterized in that: The terminal device comprises the battery according to any one of claims 1 to 21.

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