Battery and terminal device

Abstract

A battery and terminal device are disclosed. The battery includes two cells and a circuit board assembly. Each cell includes a body, a package, and tabs. The body includes a top wall, a first wall, a second wall, and two side walls. The package includes a top seal and a side seal. The top seal includes a bent portion and a root portion. The top wall includes a first top surface, and the bent portion bends toward the first top surface. The bent portion includes a first bent section and two second bent sections, the first bent section being disposed opposite to the top wall, and the second bent sections extending from the first bent sections in a direction away from the top wall. Tabs extend from the first bent sections. The side seals bend toward the first wall, and the side seals include side seal extensions that connect to the second bent sections to form protruding corners. The circuit board assembly includes a substrate. The substrate includes two first sub-substrates, each first sub-substrate disposed at a first bent section and connected to a corresponding tab. This battery allows the circuit board assembly to be placed on one side of the two cells.

Description

[0001] Cross-references to related applications This application is a divisional application of application number 202411844389.8, filed on December 13, 2024, entitled "Battery and Terminal Device". Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a battery and terminal device. Background Technology

[0003] The dual-cell structure of batteries can improve charging speed and reduce temperature rise, and is widely used in high-end mobile phones. Existing cells are usually top-sealed cells, and each top-sealed cell has a protruding corner. When a dual-cell solution is used in the battery, the two adjacent protruding corners will interfere with the protection board, which is not conducive to the placement of the protection board. Summary of the Invention

[0004] In view of the above situation, this application provides a battery to solve the above problems.

[0005] Embodiments of this application provide a battery comprising two cells and a circuit board assembly. The thickness direction of the two cells is a first direction. Viewed along the first direction, the two cells are arranged along a second direction. Each cell includes a body portion, a package portion, and tabs. The body portion includes a top wall, a first wall and a second wall connected to the top wall along the first direction, and two side walls connected to the top wall along the second direction. The package portion includes a top seal portion connected to the top wall and side seal portions connected to the side walls. The top seal portion includes a bent portion and a root portion connected between the bent portion and the top wall. The top wall includes a first top surface located between the root portion and the first wall, and the bent portion bends toward the first top surface. The bent portion includes a first bent segment and a second bent segment connected to both ends of the first bent segment along the second direction. The first bent segment and the top wall are disposed opposite each other along a third direction, and the second bent segment extends from the first bent segment along the third direction away from the top wall. Tabs extend from the first bent segment. The side seal is bent towards the first wall, and includes a side seal extension protruding from the top wall in a third direction. The side seal extension connects to the second bent section to form a convex corner. 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 in the second direction, each first sub-substrate being disposed in a first bent section and connected to a corresponding tab.

[0006] In the aforementioned battery, the substrate includes two first sub-sub ...

[0007] In some embodiments of this application, a first sub-substrate is located between two protruding corners of the battery cell along a 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 a third direction, the first connecting portion is disposed on the side of two adjacent protruding corners away from the top wall. Along the second direction, the two second connecting portions are disposed 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. Viewed along a first direction, the second flexible circuit board is separate from the battery cell and is configured to be electrically connected to an external circuit. The first protective device is disposed on the second flexible circuit board so that the first protective device is away from the top seal, facilitating the first protective device to utilize the space of the receiving cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly at the battery head and improving the energy density of the battery.

[0008] In some embodiments of this application, the first sub-substrate includes a third flexible circuit board and a reinforcing plate stacked along a third direction. A second connecting portion is connected to the third flexible circuit board, and the first flexible circuit board is integrally formed 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.

[0009] In some embodiments of this application, the first protective 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 a substrate or the first flexible circuit board and extends in a direction away from the top wall. The second part is connected to the end of the first part away from the top wall, the first PCB board is disposed in the second part, and the first electronic component is disposed on the surface of the first PCB board away from the second part. The third part is connected to the second part and configured to be electrically connected to an external circuit.

[0010] In some embodiments of this application, the circuit board assembly further includes an injection molding section disposed in the second part, wherein the second part, the first PCB board, and the first electronic component are located within the injection molding section. The injection molding section is used to improve the drop resistance of the first protective device and the second part. Furthermore, the injection molding section can also contact external structural components such as the cavity wall of the receiving cavity of the terminal device to transfer the heat generated by the first protective device to the external structural components, which helps to reduce the temperature rise of the first protective device.

[0011] In some embodiments of this application, along a third direction, there is a height difference of L3 between the first connecting portion and the first sub-substrate. The second connecting portion extends from the first connecting portion in a direction toward the top wall. Along a second direction, the second connecting portion is disposed opposite to two adjacent convex corner portions, so that the first flexible circuit board forms an inverted "U" shaped structure, which is beneficial for the first flexible circuit board to avoid the two adjacent convex corner portions.

[0012] In some embodiments of this application, the circuit board assembly includes a second protective device disposed on the surface of the substrate away from the top wall. Along a third direction, the height of the second protective device is H3, where H3 ≤ L3, to reduce space waste caused by the second protective device protruding from the first connection portion. This helps to reduce the space occupied by the circuit board assembly at the battery head, thereby improving the energy density of the battery.

[0013] In some embodiments of this application, the circuit board assembly includes two first connectors disposed on the surface of the substrate away from the top wall and connected to the tabs of corresponding battery cells. Along a second direction, the two first connectors are spaced apart, and a second protective device is located between the two first connectors to facilitate component placement.

[0014] In some embodiments of this application, a first sub-substrate is located between two protruding corners of the battery cell along a second direction. The substrate includes a second sub-substrate. Along a first direction, the second sub-substrate is located on the side of the two adjacent protruding corners near the first wall, and the second sub-substrate and the first top surface are disposed opposite each other along a third direction to avoid the two protruding corners. Along the second direction, two first sub-substrates are respectively connected to both ends of the second sub-substrate, and each first sub-substrate and a first bent section of a battery cell are disposed opposite each other along a third direction. The second sub-substrate is integrally disposed with the two first sub-substrates. The substrate and the protruding corners share the space in the third direction, which can reduce the space occupied by the substrate in the third direction and is beneficial to increasing the volume of the main body to improve the battery capacity.

[0015] In some embodiments of this application, along the first direction, the distance between the first bent section and the first wall is D1, and the distance between two adjacent side sealing extensions and the first wall is D2, where D1 < D2 and 0.15mm ≤ D2 - D1 ≤ 0.25mm, in order to reduce the risk of interference between the side sealing extensions and the second sub-substrate, and to 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.

[0016] In some embodiments of this application, a first notch is provided on the side of the side sealing extension near the first wall, and a portion of the second sub-substrate is located at the first notch, so as to reduce the risk of interference between the side sealing extension and the second sub-substrate.

[0017] In some embodiments of this application, the first notch has a first edge and a second edge. The first edge extends along a third direction and is disposed opposite to the second sub-substrate along a first direction. The second edge extends along the first direction and is disposed opposite to the second sub-substrate along a third direction. The length of the first edge is L5, 1mm≤L5≤5mm, to reduce the risk of interference between the second edge and the second sub-substrate and to improve the packaging strength of the side seal extension. The length of the second edge is L6, 0.5mm≤L6≤3.5mm, to reduce the risk of interference between the first edge and the second sub-substrate and to improve the packaging strength of the side seal extension.

[0018] In some embodiments of this application, the circuit board assembly includes a third electronic component disposed on the surface of the first sub-substrate near the first bending segment, so as 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 part of the second bending segment, thereby reducing the risk of interference between the second bending segment and the substrate.

[0019] In some embodiments of this application, the bent portion includes a first side edge away from the root. The first side edge has a second notch, which is located close to two adjacent side sealing extensions along a second direction. The second notch has a third edge and a fourth edge. The third edge extends along a first direction and is disposed opposite to the second sub-substrate along the third direction. 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 disposed opposite to two adjacent fourth edges. By providing the second notch, the space occupied by the second bent segment in the first direction is reduced, thereby reducing the risk of interference between the second bent segment and the substrate.

[0020] In some embodiments of this application, the thickness direction of the substrate is parallel to a third direction. The first sub-substrate includes a first surface, a second surface, a third surface, and a fourth surface. The first and second surfaces are disposed opposite each other along the third direction, with the first surface closer to the top wall and the second surface farther from the top wall. The third and fourth surfaces are disposed opposite each other along a first direction, with the third surface closer to the first wall and the fourth surface closer to the second wall. The circuit board assembly includes a second connector connected to the first sub-substrate. The second connector is connected to a tab and forms a joint located on the third surface. The joint shares the third-direction space with the substrate, which helps to improve the space utilization of the circuit board assembly on the top wall.

[0021] In some embodiments of this application, 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, and the first concave surface is located on the side of the first body surface away from the second sub-substrate. Along a first direction, the distance between the first body surface and the first wall is D5, and the distance between the first concave surface and the first wall is D6, where D5 < D6, and 0.2mm ≤ D6 - D5 ≤ 0.8mm. The first connecting surface connects the first body surface and the first concave surface. Along the first direction, the joint is located on the first concave surface, and along a second direction, the joint overlaps with the first connecting surface. The joint and the substrate share the space in the first and second directions, which is beneficial to improving the space utilization rate of the circuit board assembly on the top wall.

[0022] In some embodiments of this application, the top wall includes a second top surface located between the root and the second wall. The battery includes a second insulating member, which includes a first insulating portion, a second insulating portion, and a third insulating portion. Along a third direction, the first insulating portion is disposed on the side of two adjacent protruding corners away from the top wall, and the second and third insulating portions are connected to both sides of the first insulating portion along a first direction. Viewed along a third direction, the first insulating portion covers the two adjacent protruding corners. Viewed along the first direction, the second insulating portion covers the gap between the two first top surfaces and the two adjacent protruding corners. The third insulating portion covers the gap between the two second top surfaces and the two adjacent protruding corners. The second insulating member can improve the insulation stability between the two adjacent protruding corners and other structural components. The battery includes an injection molded part, which connects the second insulating member and the area of ​​the top wall separated from the second insulating member. The injection molded part covers the top seal, the tabs, and the substrate. The second insulating member can reduce the risk of injection molding material seeping into the gap between the two cells during the injection molding process.

[0023] In some embodiments of this application, the first sub-substrate is located between two protruding 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 connecting portion and two fourth connecting portions. The third connecting portion extends from the second wall of one battery cell to the second wall of the other battery cell. Along the second direction, the two fourth connecting portions are disposed at both ends of the third connecting portion and are electrically connected to a corresponding first sub-substrate. The fourth flexible circuit board is disposed on the second wall, which can reduce the space occupied by the circuit board assembly at the battery head and is beneficial to improving the energy density of the battery.

[0024] In some embodiments of this 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, where W3 > W4. The battery includes a wrapping film that connects the second walls of two battery cells. Viewed along the first direction, the wrapping film and a fourth flexible circuit board are spaced apart so that the fourth flexible circuit board and the wrapping film share the space in the first direction, which is beneficial for improving the battery energy density.

[0025] In some embodiments of this application, the substrate includes a third sub-substrate. Along a third direction, the third sub-substrate is disposed on the side of two adjacent convex corner portions away from the top wall. Along a second direction, two first sub-substrates are disposed at both ends of the third sub-substrate. The third sub-substrate is integrally formed with the two first sub-substrates. A first chamfer is provided at the junction of the side sealing extension and the second bending section. The first chamfer includes a first side and a second side, the first side being located in the side sealing extension and the second side being located in the second bending section. Along a third direction, the first side and the second side intersect at the vertex of the convex corner portion away from the top wall. The distance between the vertex and the top wall is H6, where 0.5mm ≤ H6 ≤ 1.5mm. The first chamfer is used to reduce the height of the convex corner portion, thereby reducing the space occupied by the substrate in the third direction, which is beneficial for increasing the volume of the main body to improve the battery capacity and energy density.

[0026] In some embodiments of this application, the circuit board assembly includes a third connector and a fourth electronic component. The third connector is disposed on the surface of the first sub-substrate near the first bending section and is connected to the corresponding battery cell tab. The fourth electronic component is disposed on the surface of the first sub-substrate near the first bending section, so that the third connector and the fourth electronic component share the third-party upward space with the protruding corner portion. This reduces the space occupied by the circuit board assembly in the third-party upward direction, which is beneficial to increasing the volume of the main body to improve the battery capacity and energy density.

[0027] Embodiments of this application also provide a terminal device, which includes any of the batteries described in the above embodiments. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the battery structure in one embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the disassembled structure of the battery head in one embodiment of this application.

[0030] Figure 3 yes Figure 1 Sectional view along section line III-III.

[0031] Figure 4 This is a schematic diagram of a battery with a recessed portion in one embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the structure of the first buffer, first protective member, second protective member and first insulating member of the battery in one embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the battery structure in one embodiment of this application.

[0034] Figure 7This is a schematic diagram of the circuit board assembly of the battery in one embodiment of this application.

[0035] Figure 8 This is a schematic diagram of the battery structure in one embodiment of this application.

[0036] Figure 9 This is a schematic diagram of the connection between the battery cell and the circuit board assembly in one embodiment of this application.

[0037] Figure 10 This is a schematic diagram of a battery cell separated from the circuit board assembly in one embodiment of this application.

[0038] Figure 11 yes Figure 9 A partial sectional view along section line XI-XI.

[0039] Figure 12 This is a schematic diagram of the structure of the first insulating member and the first top surface of the battery in one embodiment of this application.

[0040] Figure 13 This is a schematic diagram of the structure of the first insulating member and the second top surface of the battery in one embodiment of this application.

[0041] Figure 14 yes Figure 12 A partial sectional view along section line XIV-XIV.

[0042] Figure 15 This is a schematic diagram of the disassembled structure of a battery in one embodiment of this application.

[0043] Figure 16 yes Figure 15 A magnified view of the central region XVI.

[0044] Figure 17 This is a schematic diagram of the disassembled structure of a battery in one embodiment of this application.

[0045] Figure 18 This is a schematic diagram of the disassembled structure of a battery in one embodiment of this application.

[0046] Figure 19 yes Figure 18 A partial sectional view along section line XIX-XIX.

[0047] Figure 20 This is a schematic diagram of the structure of the first connector of the battery in one embodiment of this application.

[0048] Figure 21 This is a schematic diagram of the disassembled structure of a battery in one embodiment of this application.

[0049] Figure 22This is a schematic diagram of the disassembled structure of a battery in one embodiment of this application.

[0050] Figure 23 This is a schematic diagram of the disassembled structure of a battery in one embodiment of this application.

[0051] Figure 24 yes Figure 23 A partial sectional view along section lines XXIV-XXIV.

[0052] Figure 25 This is a schematic diagram of the battery structure in one embodiment of this application.

[0053] Figure 26 This is a schematic diagram of the structure of the fourth flexible circuit board of the battery in one embodiment of this application.

[0054] Figure 27 This is a schematic diagram of the structure of the battery wrapping film in one embodiment of this application.

[0055] Figure 28 This is a schematic diagram of the battery structure in one embodiment of this application.

[0056] Figure 29 This is a schematic diagram of the disassembled structure of a battery in one embodiment of this application.

[0057] Figure 30 This is a schematic diagram of the unfolded packaging section of the battery cell in one embodiment of this application.

[0058] Figure 31 This is a schematic diagram of the terminal device in one embodiment of this application.

[0059] Figure 32 This is a schematic diagram of the terminal device in another embodiment of this application.

[0060] Explanation of main component symbols Batteries 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K Terminal devices 200A and 200B Battery Cell 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 section 12 Convex corner 12A Top sealing section 121 Bending part 121A First bend segment 1211 Second bend section 1212 Second gap 1213 Third edge 1214 Fourth Edge 1215 Root 121B First side 121C Side sealing part 122 Side sealing extension 122A First gap 1221 First edge 1222 Second edge 1223 Side seal body 122B JE13 First extension section 131 Second extension section 132 Third extension section 133 Fourth extension paragraph 134 Circuit board assembly 20 Substrate 21 First sub-substrate 211 Third flexible circuit board 2111 Reinforcing plate 2112 First surface 211A Second surface 211B Third surface 211C First ontology face 2113 First concave surface 2114 First connecting surface 2115 Fourth surface 211D The third gap 2116 Second sub-substrate 212 First flexible circuit board 22 First connecting part 221 Second connecting part 222 Second flexible circuit board 23 Part 1, Chapter 231 Part 2, Chapter 232 Adhesive component 2321 Part 3, Chapter 233 Connector 2331 Reinforcing component 2332 First protective devices 24, 96 First PCB board 241 First electronic component 242 Second electronic component 243 Injection Molding Department 25 Recess 251 First connector 26 First paragraph 261 Second paragraph 262 Third paragraph, 263 Second protection device 27 Second connector 28 Joint 28A First paragraph, 281 Second paragraph 282 Third paragraph, 283 Paragraph 4, page 284 First Subsection 284A Second Subsection 284B Gap 284C Fourth flexible circuit board 29 Third connecting part 291 Fourth connecting part 292 Fourth Electronic Component 201 Third connector 202 First buffer 30 First buffer section 31 Second buffer section 32 First protective component 40 First Protective Unit 41 Second protective section 42 Second protective component 50 First insulating component 60 Second insulating component 71 First Insulation Section 711 Second insulating part 712 Third Insulation Section 713 Injection molded part 80 Recess 81 Encapsulation film 90 Motherboard 95 First direction X Second direction Y Third direction Z The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0062] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be components positioned in between. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be components positioned in between. It should be understood that, considering the factors of actual machining tolerances, in the technical solution of this application, when two components are set parallel / perpendicularly, they are set in the same direction, and there may be a certain angle between the two components. The angle between the two components is allowed to have a tolerance of 0-±10%.

[0063] When one value is considered "equal" to another, it means that they are equal within a set deviation range, which is within 10%. In other words, if at least one of the two values ​​fluctuates within the set deviation range, they are considered approximately equal even if their values ​​are not equal. Similarly, when one value is considered to have a "1:1" ratio with another, it means that they are equal within a set deviation range, which is within 10%. Again, if at least one of the two values ​​fluctuates within the set deviation range, they are considered equal in ratio even if their values ​​are not equal.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The term "overlap" as used herein refers to the overlapping of the projected portions of two components or the coincidence of the projected portions of two components.

[0065] One embodiment of this application provides a battery including two cells and a circuit board assembly. The thickness direction of the two cells is a first direction. Viewed along the first direction, the two cells are arranged along a second direction. Each cell includes a body portion, a package portion, and tabs. The body portion includes a top wall, a first wall and a second wall connected to the top wall along the first direction, and two side walls connected to the top wall along the second direction. The package portion includes a top seal portion connected to the top wall and side seal portions connected to the side walls. The top seal portion includes a bent portion and a root portion connected between the bent portion and the top wall. The top wall includes a first top surface located between the root portion and the first wall, and the bent portion bends toward the first top surface. The bent portion includes a first bent segment and a second bent segment connected to both ends of the first bent segment along the second direction. The first bent segment and the top wall are disposed opposite each other along a third direction, and the second bent segment extends from the first bent segment in a direction away from the top wall along the third direction. Tabs extend from the first bent segment. The side seal is bent towards the first wall, and includes a side seal extension protruding from the top wall in a third direction. The side seal extension connects to the second bent section to form a convex corner. 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 in the second direction, each first sub-substrate being disposed in a first bent section and connected to a corresponding tab.

[0066] In the aforementioned battery, the substrate includes two first sub-sub ...

[0067] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0068] Example 1 Please refer to the following: Figure 1 and Figure 2 One embodiment of this application provides a battery 100A. The battery 100A may be, but is not limited to, a rechargeable battery, which is a battery that can be used again after being discharged by recharging to activate the active materials.

[0069] 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. 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.

[0070] Please refer to the following: Figure 1 and Figure 2 The battery cell 10 includes a main body 11, an encapsulation part 12, and a tab 13. The main body 11 and the encapsulation part 12 are made of encapsulation film by punching, folding, and heat sealing. The main body 11 is the part of the encapsulation film with punched positions, and the encapsulation part 12 is the part of the encapsulation film that overlaps and joins.

[0071] 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.

[0072] The encapsulation part 12 includes a top seal 121 and two side seals 122. The top seal 121 is connected to the top wall 111, and each side seal 122 is connected to a side wall 114.

[0073] The top sealing portion 121 includes a bent portion 121A and a root portion 121B connecting the bent 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 bent portion 121A bends toward the first top surface 111A to reduce the space occupied by the top sealing portion 121 in the third direction Z. Specifically, the bent portion 121A includes a first bent segment 1211 and a second bent segment 1212 connecting both ends of the first bent segment 1211 along the second direction Y. The first bent segment 1211 is disposed opposite to the first top surface 111A in the third direction Z, and the second bent segment 1212 extends from the first bent segment 1211 in the third direction Z in a direction away from the top wall 111.

[0074] The tab 13 extends from the bend 121A to facilitate electrical connection with the circuit board assembly 20. Specifically, the tab 13 extends from the side of the first bend 1211 away from the root 121B.

[0075] The side sealing portion 122 is bent in the direction toward the first wall 112. The side sealing portion 122 includes a side sealing extension 122A that protrudes from the top wall 111 in the third direction Z. The side sealing extension 122A is connected to the bent portion 121A. Specifically, the side sealing extension 122A is connected to the second bent segment 1212 to form a convex corner portion 12A.

[0076] 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 on a first bending section 1211 and connected to a corresponding tab 13, so as to avoid two adjacent protruding corners 12A, thereby reducing the risk of interference between the two adjacent protruding corners 12A and the substrate 21, and thus facilitating the placement of the circuit board assembly 20 on one side of the two battery cells 10.

[0077] In some embodiments, the first sub-substrate 211 is located between the two protruding corner portions 12A of the cell 10 along the second direction Y. The first sub-substrate 211 and the protruding 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 increase the volume of the main body 11 to improve the capacity and energy density of the battery 100A.

[0078] 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 connecting portion 221 and two second connecting portions 222. Along the third direction Z, the first connecting portion 221 is disposed on the side away from the top wall 111 of two adjacent convex corner portions 12A. Along the second direction Y, the two second connecting portions 222 are disposed 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.

[0079] The second flexible circuit board 23 extends from the first flexible circuit board 22 in a direction away from the top wall 111. Viewed along the first direction X, the second flexible circuit board 23 is separate 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 the motherboard of an external terminal device.

[0080] The first protection device 24 is used to construct a protection circuit, which can provide overcharge, over-discharge, overcurrent, short circuit, and anti-counterfeiting protection functions for the battery cell 10, but is not limited to these functions. 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 121, which facilitates the first protection device 24 to utilize 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 and improving the energy density of the battery 100A.

[0081] Furthermore, existing battery structures typically place protection devices on the substrate, and the flexible circuit board connected to the substrate requires additional connection lines for electrical connection with the protection devices, in addition to the current-carrying lines. By placing 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 beneficial for the layout of the current-carrying lines on the first flexible circuit board 22, thereby improving the current-carrying capacity of the first flexible circuit board 22.

[0082] Please continue reading. Figure 2 In some embodiments, the width of the first flexible circuit board 22 along the first direction X 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.

[0083] In some embodiments, 2mm≤L1≤6mm. When L1 is too small (less than 2mm), the first flexible circuit board 22 may not meet the overcurrent requirements; when L1 is too large (greater than 6mm), the first flexible circuit board 22 may protrude from the 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 cell 10 along the first direction X is reduced.

[0084] Optionally, L1 can be one of 2mm, 3mm, 4mm, 5mm, 6mm, or any other value within the range of 2mm≤L1≤6mm.

[0085] In some embodiments, the first flexible circuit board 22 includes a conductive copper layer, and the number of conductive copper layers is two, so as to facilitate bending of the first flexible circuit board 22.

[0086] It should be noted that when the first flexible circuit board 22 is in the unfolded state, it is a rectangular sheet structure with a width of L1. Correspondingly, the widths of the first connecting portion 221 and the two second connecting portions 222 are equal and both are L1. The thickness of each part of the sheet structure is equal, and correspondingly, the thicknesses of the first connecting portion 221 and the two second connecting portions 222 are equal.

[0087] In some embodiments, along the third direction Z, there is a height difference of L3 between the first connecting portion 221 and the first sub-substrate 211. The second connecting portion 222 extends from the first connecting portion 221 in the direction toward the top wall 111. Along the second direction Y, the second connecting 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.

[0088] Please continue reading. Figure 2In some embodiments, the first sub-substrate 211 includes a third flexible circuit board 2111 and a reinforcing plate 2112, which are stacked along a third direction Z. The third flexible circuit board 2111 is electrically connected to the tab 13 of the corresponding 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 formed 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 2111. The reinforcing plate 2112 is used to support the third flexible circuit board 2111 to improve the structural stability of the third flexible circuit board 2111.

[0089] Optionally, the reinforcing plate 2112 is disposed on the surface of the third flexible circuit board 2111 near the top wall 111, or the reinforcing plate 2112 is disposed on the surface of the third flexible circuit board 2111 away from the top wall 111.

[0090] It is understood that in some embodiments, the reinforcing plate 2112 is replaced by a PCB board.

[0091] Please continue reading. Figure 2 In some embodiments, the first protective 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 extends away from the top wall 111. The second portion 232 is connected to the 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 the surface of the first PCB board 241 away from the second portion 232, so that the first protective device 24 is away from the top seal portion 121. The third portion 233 is connected to the second portion 232 and is configured to be electrically connected to an external circuit.

[0092] In some embodiments, the third part 233 is provided with a connector 2331 and a reinforcing member 2332 on its two sides in the thickness direction, respectively. The connector 2331 is configured to be electrically connected to an external circuit, and the reinforcing member 2332 is used to improve the structural strength of the third part 233.

[0093] In some embodiments, the second part 232 is provided with an adhesive 2321 on the side away from the first PCB board 241. The adhesive 2321 is used to bond with the structure inside the receiving cavity of the terminal device so as to stably fix the second part 232 and the first protective device 24 to the receiving cavity of the terminal device.

[0094] In some embodiments, in a direction perpendicular to the arrangement direction of the first part 231 and the second part 232, the width of the second part 232 is greater than the width of the first part 231, so as to increase the connection area between the second flexible circuit board 23 and the first PCB board 241, and facilitate the reduction of the space occupied by the circuit board assembly 20 at the head of the battery 100A.

[0095] In some embodiments, in a direction perpendicular to the arrangement direction of the second part 232 and the third part 233, the width of the second part 232 is greater than the width of the third part 233, so as to increase the connection area between the second flexible circuit board 23 and the first PCB board 241, and to reduce the risk of interference with other structures when the third part 233 is connected to external circuits.

[0096] Please refer to the following: Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 further includes an injection molding section 25 disposed within the second part 232, wherein the second part 232, the first PCB board 241, and the first electronic component 242 are located within the injection molding section 25. Specifically, the injection molding section 25 is formed on the outside of the second part 232, the first PCB board 241, and the first electronic component 242 by melting and solidifying the injection molding material using injection molding equipment. The injection molding section 25 is used to improve the drop resistance of the first protective device 24 and the second part 232. Furthermore, the injection molding section 25 can also contact external structural components such as the cavity wall of the receiving cavity of the terminal device to transfer the heat generated by the first protective device 24 to the external structural components, which helps to reduce the temperature rise of the first protective device 24.

[0097] Optionally, the injection molding material includes at least one of polyamide, silicone resin and rubber.

[0098] Please see Figure 3 In some embodiments, when viewed along the arrangement direction of the second part 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 part 25, and the distance between the outer peripheral edge of the first PCB board 241 and the outer peripheral edge of the injection molding part 25 is W1, 0.2mm≤W1≤0.5mm, so as to reduce the risk of the injection molding part 25 being too thin and easily damaged, and to reduce the space waste caused by the injection molding part 25 protruding too much relative to the second part 232.

[0099] Optionally, W1 can be one of 0.2mm, 0.3mm, 0.4mm, 0.5mm, or any other value within the range of 0.2mm≤W1≤0.5mm.

[0100] It should be noted that multiple measuring points are set between the outer periphery of the second part 232 and the outer periphery of the injection part 25 to measure W1. The W1 corresponding to the multiple measuring points can be equal or unequal to meet the requirements of production tolerance.

[0101] Please see Figure 4 In some embodiments, the first protection device 24 includes a second electronic component 243 disposed on the 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.

[0102] 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, where H1 ≤ H2. A recess 251 is provided on the surface of the injection molding part 25 away from the first PCB board 241, and the end face of the second electronic component 243 away from the first PCB board 241 is exposed through the recess 251, which helps to reduce the overall thickness of the second part 232, the first protective device 24, and the injection molding part 25. Specifically, in the existing injection molding process, sufficient gap needs to be reserved between the end face of the electronic component and the injection molding equipment for the flow of injection molding material, thus solidifying between the end face of the electronic component and the injection molding equipment to form the injection molding part, which leads to an increase in the thickness of the injection molding part. By providing the recess 251, the second electronic component 243 is exposed in the injection molding part 25, which helps to reduce the overall thickness of the second part 232, the first protective device 24, and the injection molding part 25.

[0103] In some embodiments, 1mm≤H2≤3mm is used to improve the structural strength of the injection molding portion 25 and reduce the space waste caused by excessive thickness of the injection molding portion 25.

[0104] Optionally, H2 can be one of the following: 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, or any other value within the range of 1mm≤H2≤3mm.

[0105] Please refer to it again. Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 includes a first connector 26, which is disposed on the surface of the first sub-substrate 211 away from the top wall 111 and connected to the tab 13 of the corresponding cell 10, so that the first connector 26 and the protruding 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 helping to improve the energy density of the battery 100A.

[0106] Optionally, the first connector 26 is a nickel sheet or a nickel block.

[0107] Please see Figure 5 In some embodiments, the battery 100A includes a first buffer 30. The first buffer 30 includes a first buffer portion 31 and two second buffer portions 32, which 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 two adjacent protruding corner portions 12A to provide a buffering effect when the head of the battery 100A is subjected to an external impact, reducing the risk of damage to the first flexible circuit board 22 or the two adjacent protruding corner portions 12A. The second buffer portions 32 are disposed between the first sub-substrate 211 and the first bending section 1211 to provide a buffering effect when the head of the battery 100A is subjected to an external impact, reducing the risk of damage to the first sub-substrate 211 or the first bending section 1211.

[0108] In some embodiments, the outer surface of the first buffer 30 is adhesive to reduce the risk of misalignment of the first buffer 30.

[0109] Optionally, the first cushioning element 30 is foam.

[0110] In some embodiments, the battery 100A includes a first protective member 40, which is disposed on the surface of the first buffer member 30 near the circuit board assembly 20 to resist puncture when the head of the battery 100A is subjected to an external impact, thereby reducing the risk of damage to the cell 10.

[0111] Specifically, the first protective member 40 includes a first protective portion 41 and two second protective portions 42. Along the second direction Y, the two second protective portions 42 are disposed at both ends of the first protective portion 41. The first protective portion 41 is disposed between the first flexible circuit board 22 and the first buffer portion 31, and the second protective portions 42 are disposed between the first sub-substrate 211 and the second buffer portion 32.

[0112] In some embodiments, the outer surface of the first protective member 40 is adhesive to reduce the risk of misalignment of the first buffer member 30.

[0113] Optionally, the first cushioning element 30 is made of DuPont paper.

[0114] In some embodiments, the battery 100A includes a second protective member 50, which is disposed on the side of the first sub-substrate 211 away from the top wall 111, so as to protect the part 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.

[0115] 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.

[0116] Optionally, the second protective component 50 is a silicone pad.

[0117] 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, so as to expand the protection range of the second protective member 50 and facilitate the protection of the surface of the first sub-substrate 211 away from the top wall 111 by the second protective member 50.

[0118] In some embodiments, the battery 100A includes a first insulating member 60 that covers the protruding corner portion 12A to improve the insulation stability between the protruding corner portion 12A and the circuit board assembly 20.

[0119] Optionally, the first insulating element 60 is a Mylar membrane.

[0120] Example 2 Please refer to the following: Figure 6 and Figure 7 An embodiment of this application also provides a battery 100B. The difference between battery 100B and battery 100A is that a second protection device 27 is provided on the substrate 21.

[0121] The circuit board assembly 20 includes a second protection device 27, which is disposed on the 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.

[0122] In some embodiments, along the third direction Z, the height of the second protection device 27 is H3, where H3≤L3, so as to reduce the space wastage caused by the second protection device 27 protruding from the first connection portion 221, which is beneficial to reduce the space occupied by the circuit board assembly 20 at the head of the battery 100B, and thus beneficial to improve the energy density of the battery 100B.

[0123] By placing 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 advantageous to group and configure the protection devices according to factors such as their performance and size. Specifically, using L3 as a preset threshold, protection devices with a height greater than L3 are placed on the second flexible circuit board 23 as the first protection device 24, and at least some protection devices with a height less than L3 are placed on the first sub-substrate 211 as the second protection device 27. This reduces the space occupied by the circuit board assembly 20 at the head of the battery 100B while meeting the protection circuit requirements, which is beneficial to improving the energy density of the battery 100B.

[0124] In some embodiments, 0.1mm≤H3≤0.5mm is beneficial to reduce the space wastage caused by the second protective device 27 protruding from the first connecting portion 221.

[0125] Please continue reading. Figure 6 and Figure 7 In some embodiments, the circuit board assembly 20 includes two first connectors 26 arranged at intervals along the second direction Y, and a second protective device 27 is located between the two first connectors 26 to facilitate component placement.

[0126] In some embodiments, the first connector 26 is a U-shaped nickel sheet. The first connector 26 includes a first segment 261, a second segment 262, and a third segment 263. The first segment 261 is disposed on the surface of the first sub-substrate 211 away from the top wall 111, the second segment 262 is located on the side of the first segment 261 away from the first sub-substrate 211 and is spaced apart from the first segment 261 along a third direction Z, and the third segment 263 is disposed between the first segment 261 and the second segment 262. The tab 13 includes a first extension segment 131 extending along a first direction X, the first extension segment 131 being disposed between the first segment 261 and the second segment 262 to improve the stability of the connection between the first connector 26 and the tab 13.

[0127] Along the third direction Z, the sum of the thicknesses of the first segment 261, the second segment 262, and the first extension segment 131 is H4, where H3≤H4, in order to reduce the risk of the second protective device 27 protruding from the first connector 26 and interfering with other structural components (such as the second protective component 50).

[0128] Apart from the differences mentioned above, the parameters of battery 100B and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0129] Example 3 Please refer to the following: Figure 8 An embodiment of this application also provides a battery 100C. The difference between battery 100C and battery 100A lies in the structure of the circuit board assembly 20.

[0130] Please refer to the following: Figure 9 and Figure 10The first sub-substrate 211 is located between the two protruding corner portions 12A of the cell 10 along the second direction Y. The substrate 21 includes a second sub-substrate 212. Along the first direction X, the second sub-substrate 212 is located on the side of the two adjacent protruding corner portions 12A near the first wall 112, and the second sub-substrate 212 is disposed opposite to the first top surface 111A along the third direction Z to avoid the two protruding corner portions 12A. Along the second direction Y, two first sub-substrates 211 are respectively connected to the two ends of the second sub-substrate 212. Each first sub-substrate 211 is disposed opposite to the first bent section 1121 of a cell 10 along the third direction Z. The second sub-substrate 212 is integrally disposed with the two first sub-substrates 211. The substrate 21 and the protruding 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 increase the volume of the main body 11 to increase the capacity of the battery 100C.

[0131] Please refer to the following: Figure 10 and Figure 11 In some embodiments, along the first direction X, the distance between the first bent segment 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, where D1 < D2, so as to reduce the risk of interference between the side sealing extensions 122A and the second sub-substrate 212, and to 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 carrying capacity of the second sub-substrate 212.

[0132] It should be noted that D1 is measured in the following way: multiple measurement points are selected on the side of the first bending segment 1211 away from the root 121B, and the distance between each measurement point and the first wall 112 along the first direction X is measured. The average value of the multiple distance values ​​is D1. D2 is measured in the following way: taking the one of the two adjacent side sealing extensions 122A that is closer to the first wall 112 as the measurement target, multiple measurement points are selected on the side of the side sealing extension 122A that is closer to the first wall 112, and the distance between each measurement point and the first wall 112 along the first direction X is measured. The average value of the multiple distance values ​​is D2.

[0133] In some embodiments, 0.15mm ≤ D2-D1 ≤ 0.25mm. When D2-D1 is too small (less than 0.15mm), interference between the side sealing extension 122A and the second sub-substrate 212 is likely to occur. When D2-D1 is too large (greater than 0.25mm), the side sealing extension 122A may lose a large amount of packaging area, resulting in a decrease in packaging strength. By limiting 0.15mm ≤ D2-D1 ≤ 0.25mm, the risk of interference between the side sealing extension 122A and the second sub-substrate 212 is reduced, and the packaging strength of the side sealing extension 122A is improved.

[0134] Optionally, D2-D1 can be one of 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, or any other value within the range of 0.15mm≤D2-D1≤0.25mm.

[0135] In some embodiments, the circuit board assembly 20 includes a third electronic component (not shown) configured to form a protection circuit for the protective cell 10. Along the third direction Z, the width of the second bending segment 1212 gradually decreases in the first direction X, meaning the space occupied by the second bending segment 1212 in the first direction X decreases as it moves away from the top wall 111. The third electronic component is disposed on the surface of the first sub-substrate 211 near the first bending segment 1121 to increase the distance between the first sub-substrate 211 and the top wall 111 in the third direction Z, allowing the first sub-substrate 211 to avoid larger portions of the second bending segment 1212, thereby reducing the risk of interference between the second bending segment 1212 and the substrate 21.

[0136] Please continue reading. Figure 10 In some embodiments, the width of the second sub-substrate 212 along the first direction X is W2, where 1mm ≤ W2 ≤ 4mm, D2 ≥ W2, and 1.5mm ≤ D2 ≤ 4.5mm. When W2 is too small (less than 1mm), the structural strength and current carrying capacity of the second sub-substrate 212 are easily weakened, and the temperature rise of the second sub-substrate 212 is easily aggravated during the use of the substrate 21. When W2 is too large (greater than 4mm or greater than D2), the second sub-substrate 212 is easily caused to protrude from the first wall 112 along the first direction X, resulting in wasted space. By limiting 1mm ≤ W2 ≤ 4mm and D2 ≥ W2, it is beneficial to improve the structural strength and current carrying capacity of the second sub-substrate 212, reduce the temperature rise of the second sub-substrate 212 during the use of the substrate 21, and improve the space utilization rate of the second sub-substrate 212 on the top wall 111.

[0137] Optionally, W2 can be one of 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or any other value within the range of 1mm≤W2≤4mm. D2 can be one of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or any other value within the range of 1.5mm≤D2≤4.5mm.

[0138] Please continue reading. Figure 10In some embodiments, the length of the second sub-substrate 212 along the second direction Y is L4, where 3mm ≤ L4 ≤ 12mm. When L4 is too small (less than 3mm), interference between the first sub-substrate 211 and the protruding corner portion 12A is likely to occur; when L4 is too large (greater than 12mm), the fabrication 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 protruding corner portion 12A is reduced, and it is also easier to increase the fabrication area of ​​the first sub-substrate 211.

[0139] Optionally, L4 can be one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, or any other value within the range of 3mm≤L4≤12mm.

[0140] Please refer to it again. Figure 11 In some embodiments, the height of the side sealing extension 122A along the third direction Z is H5, where H5 ≥ 1.5 mm, to improve the sealing strength of the side sealing extension 122A.

[0141] Optionally, H5 can be one of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or any other value within the range of H5≥1.5mm.

[0142] Please refer to the following: Figure 10 and Figure 11 In some embodiments, a notch is formed by cutting the side sealing extension 122A to allow the side sealing extension 122A to avoid the second sub-substrate 212. Specifically, a first notch 1221 is provided on the side of the side sealing extension 122A near the first wall 112, and a portion of the second sub-substrate 212 is located in the first notch 1221 to reduce the risk of interference between the side sealing extension 122A and the second sub-substrate 212.

[0143] The first notch 1221 has a first edge 1222 and a second edge 1223. The first edge 1222 extends along a third direction Z and is disposed opposite to the second sub-substrate 212 along a first direction X. The second edge 1223 extends along the first direction X and is disposed opposite to the second sub-substrate 212 along a third direction Z.

[0144] The length of the first edge 1222 is L5, where 1mm ≤ L5 ≤ 5mm. When L5 is too small (less than 1mm), interference between the second edge 1223 and the second sub-substrate 212 is likely to occur. When L5 is too large (greater than 5mm), the side sealing extension 122A will lose a large amount of packaging area, resulting in a decrease in packaging strength. By limiting L5 to 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 sealing extension 122A is improved.

[0145] Optionally, L5 can be one of 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or any other value within the range of 1mm≤L5≤5mm.

[0146] Furthermore, L5=H5 to further reduce the risk of interference between the second edge 1223 and the second sub-substrate 212.

[0147] The length of the second edge 1223 is L6, where 0.5mm ≤ L6 ≤ 3.5mm. When L6 is too small (less than 0.5mm), interference may easily occur between the first edge 1222 and the second sub-substrate 212. When L6 is too large (greater than 3.5mm), the side sealing extension 122A may lose a large amount of packaging area, resulting in a decrease in packaging strength. By limiting L6 to 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 sealing extension 122A is improved.

[0148] Optionally, L6 can be one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, or any other value within the range of 0.5mm≤L6≤3.5mm.

[0149] Please continue reading. Figure 11 In some embodiments, along the first direction X, the distance between the first edge 1222 and the side of the side sealing extension 122A away from the first wall 112 is D3, where 1.5mm ≤ D3 ≤ 4.5mm. When D3 is too small (less than 1.5mm), the side sealing 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 D3 to 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 sealing extension 122A is improved.

[0150] Optionally, D3 can be one of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or any other value within the range of 1.5mm≤D3≤4.5mm.

[0151] Please refer to the following: Figure 12 and Figure 13 In some embodiments, the top wall 111 includes a second top surface 111B located between the root 121B and the second wall 113. Optionally, the first top surface 111A is the deep pit surface of the battery 100C, and the second top surface 111B is the shallow pit surface of the battery 100C.

[0152] 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 disposed on the side of two adjacent protruding corner portions 12A away from the top wall 111. 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. Viewed along the third direction Z, the first insulating portion 711 covers the two adjacent protruding corner portions 12A. 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 protruding corner portions 12A. The third insulating portion 713 covers the gap between the two second top surfaces 111B and the two adjacent protruding corner portions 12A. The second insulating member 71 can improve the insulation stability between the two adjacent protruding corner portions 12A and other structural components.

[0153] Optionally, the second insulating element 71 is DuPont paper.

[0154] In some embodiments, the battery 100C includes an injection molded part 80, which connects the second insulating member 71 and the area of ​​the top wall 111 that is separate from the second insulating member 71. 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 designated area by melting and solidifying the injection molding material using an injection molding machine. The second insulating member 71 can reduce the risk of the injection molding material seeping into the gap between the two battery cells 10 during the injection molding process.

[0155] Please refer to the following: Figure 12 and Figure 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 seal portion 121 on the top wall 111.

[0156] Optionally, the third insulating element 72 is an adhesive layer.

[0157] Please continue reading. Figure 12 and Figure 14In some embodiments, the battery 100C includes a fourth insulating member 73, which is bonded to the side of the second top surface 111B and the bend 121A away from the first top surface 111A. The fourth insulating member 73 is located between the bend 121A and the substrate 21 to improve the stability of the insulation between the top seal 121 and the substrate 21.

[0158] Optionally, the fourth insulating element 73 is DuPont paper.

[0159] Please refer to it again. Figure 12 and Figure 13 In some embodiments, the thickness direction of 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 disposed opposite each other along the third direction Z, with the first surface 211A closer to the top wall 111 and the second surface 211B farther from the top wall 111. The third surface 211C and the fourth surface 211D are disposed opposite each other along the first direction X, with the third surface 211C closer to the first wall 112 and the fourth surface 211D closer to the second wall 113.

[0160] The circuit board assembly 20 includes a second connector 28, which is connected to the first sub-substrate 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 shares the third-direction Z-space with the substrate 21, which helps to improve the space utilization of the circuit board assembly 20 on the top wall 111.

[0161] Please continue reading. Figure 12In some embodiments, the third surface 211C includes a first body surface 2113, a first concave surface 2114, and a first connecting 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, where D5 < D6, and 0.2mm ≤ D6 - D5 ≤ 0.8mm. The first connecting surface 2115 connects the first body surface 2113 and the first concave surface 2114. Along the first direction X, the joint portion 28A is located on the first concave surface 2114, and along the second direction Y, the joint portion 28A overlaps with the first connecting surface 2115. The joint portion 28A shares the space in the first direction X and the second direction Y with the substrate 21, which is beneficial to improving the space utilization rate of the circuit board assembly 20 on the top wall 111. By limiting 0.2mm≤D6-D5≤0.8mm, the joint portion 28A can utilize the accommodating 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.

[0162] Optionally, D6-D5 can be one of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, or any other value within the range of 0.2mm≤D6-D5≤0.8mm.

[0163] Please refer to the following: Figure 12 and Figure 14 In some embodiments, the second connector 28 is an "L"-shaped nickel sheet. The second connector 28 includes a first segment 281, a second segment 282, and a third segment 283. The first segment 281 is connected to the first surface 211A, the third segment 283 is spaced apart from the third surface 211C along the first direction X, and the second segment 282 is bent and connected between the first segment 281 and the third segment 283. Specifically, the third segment 283 is spaced apart from the first concave surface 2114 along the first direction X.

[0164] The tab 13 includes a first extension 131, a second extension 132, a third extension 133, and a fourth extension 134 connected in sequence. The first extension 131 extends from the bend 121A. The second extension 132 is located along the first direction X on the side of the third segment 283 away from the third surface 211C. The third extension 133 is located along the third direction Z on the side of the third segment 283 away from the first top surface 111A. The fourth extension 134 is located along the first direction X between the third segment 283 and the third surface 211C and connects to the third segment 283. The fourth extension 134 connects to the third segment 283 to form a joint 28A, which helps to improve the stability of the connection between the second connector 28 and the tab 13.

[0165] Please continue reading. Figure 12 In some embodiments, viewed along the third direction Z, the fourth surface 211D is provided with a third notch 2116, and the injection molded part 80 fills the third notch 2116 so that the injection molding material can penetrate into the area of ​​the top wall 111 that is separated from the second insulating part 71 during the injection molding process.

[0166] Please refer to it again. Figure 8 and Figure 9 In some embodiments, the circuit board assembly 20 includes a second flexible circuit board 23 connected to the substrate 21, and the second flexible circuit board 23 is configured to be electrically connected to an external circuit. An injection molded part 80 covers the portion where the second flexible circuit board 23 connects to the substrate 21 to improve the stability of the connection between the second flexible circuit board 23 and the substrate 21.

[0167] Optionally, the injection molded part 80 has a recess 81 on the surface away from the top wall 111, and the second flexible circuit board 23 extends from the recess 81, which helps to expand the movement angle of the second flexible circuit board 23.

[0168] Apart from the differences mentioned above, the parameters of battery 100C and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0169] Example 4 Please refer to the following: Figure 15 and Figure 16 An embodiment of this application also provides a battery 100D. The difference between battery 100D and battery 100C is that the top sealing portion 121 is cut to form a notch.

[0170] The bent portion 121A includes a first side 121C away from the root portion 121B. The first side 121C has a second notch 1213. Along the second direction Y, the second notch 1213 is close to two adjacent side sealing extensions 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 disposed opposite to the second sub-substrate 212 along the third direction Z. 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-substrate 212 is disposed opposite to two adjacent fourth edges 1215. The third edge 1214 is located in the first bent section 1211, and one end of the fourth edge 1215 is located in the first bent section 1211, and the other end is located in the second bent section 1212. By providing a second notch 1213, the space occupied by the second bent segment 1212 in the first direction X is reduced, thereby reducing the risk of interference between the second bent segment 1212 and the substrate 21.

[0171] Apart from the differences mentioned above, the parameters of battery 100D and battery 100C are roughly the same. Please refer to the description of battery 100C above.

[0172] Example 5 Please see Figure 17 An embodiment of this application also provides a battery 100E. The difference between battery 100E and battery 100C is that the side sealing extension 122A is not cut to form a notch.

[0173] The side sealing portion 122 includes a side sealing body portion 122B, which is connected to the side sealing body portion 122B and the side sealing extension portion 122A along a third direction Z, and the side sealing body portion 122B is disposed opposite to the side wall 144. Along the first direction X, the distance between the side sealing extension portion 122A and the first wall 112 is equal to the distance between the side sealing body portion 122B and the first wall 112, that is, the side sealing extension portion 122A is not cut to form a notch.

[0174] 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 and the first top surface 111A are arranged opposite each other along the third direction Z.

[0175] It should be noted that battery 100E is suitable for thicker batteries, while batteries 100C and 100D are suitable for thinner batteries.

[0176] Apart from the differences mentioned above, the parameters of battery 100E and battery 100C are roughly the same. Please refer to the description of battery 100C above.

[0177] Example 6 Please refer to the following: Figure 18 and Figure 19 An embodiment of this application also provides a battery 100F. The difference between battery 100F and battery 100C lies in the connection structure of the second connector 28 and the tab 13.

[0178] The second connector 28 includes a first segment 281, a second segment 282, a third segment 283, a fourth segment 284, and a fifth segment 285. The first segment 281 is connected to the first surface 211A, the third segment 283 is spaced apart from the third surface 211C along the first direction X, the second segment 282 is bent and connected between the first segment 281 and the third segment 283, the fifth segment 285 is located along the first direction X on the side of the third segment 283 away from the third surface 211C, and the fourth segment 284 is bent and connected between the third segment 283 and the fifth segment 285.

[0179] The tab 13 includes a first extension 131, a second extension 132, a third extension 133, and a fourth extension 134 connected sequentially. The first extension 131 extends from the bend 121A. The second extension 132 is located along the first direction X on the side of the fifth segment 285 away from the third segment 283 and is connected to the fifth segment 285. The third extension 133 is located along the third direction Z on the side of the fourth segment 284 away from the first top surface 111A. The fourth extension 134 is located along the first direction X between the third segment 283 and the third surface 211C and is connected to the third segment 283. The connection between the fourth extension 134 and the third segment 283, and the connection between the second extension 132 and the fifth segment 285, form a joint 28A, which helps to improve the stability of the connection between the second connector 28 and the tab 13.

[0180] Please see Figure 20 In some embodiments, the fourth segment 284 includes a first sub-part 284A and a second sub-part 284B spaced apart along the second direction Y, with a gap 284C passing through the second connector 28 between the first sub-part 284A and the second sub-part 284B to facilitate bending of the fourth segment 284.

[0181] Apart from the differences mentioned above, the parameters of battery 100F and battery 100C are roughly the same. Please refer to the description of battery 100C above.

[0182] Example 7 Please refer to the following: Figure 21 and Figure 22 An embodiment of this application also provides a battery 100G. The difference between battery 100G and battery 100C lies in the connection structure of the second connector 28 and the tab 13.

[0183] The second connector 28 is a nickel block, and the second connector 28 is located on the third surface 211C.

[0184] The tab 13 includes a first extension 131, a second extension 132, and a third extension 133 connected in sequence. The first extension 131 extends from the bend 121A, the second extension 132 is located on one side of the second connector 28 along the first direction X and is connected to the second connector 28, and the third extension 133 is stacked on the second surface 211B. The second extension 132 is connected to the second connector 28 to form a joint 28A, which helps to improve the stability of the connection between the second connector 28 and the tab 13.

[0185] It is understood that in some embodiments, the third surface 211C is provided with pads, and the second extension 132 is welded to the pads of the third surface 211C.

[0186] It is understood that in some embodiments, the second surface 211B is provided with pads, and the second extension 132 is located on one side of the third surface 211C along the first direction X, and the second extension 132 is welded to the pads of the second surface 211B.

[0187] Apart from the differences mentioned above, the parameters of battery 100G and battery 100C are roughly the same. Please refer to the description of battery 100C above.

[0188] Example 8 Please refer to the following: Figure 23 and Figure 24 An embodiment of this application also provides a battery 100H. The difference between battery 100H and battery 100C lies in the connection structure of the second connector 28 and the tab 13.

[0189] The second connector 28 is located on the first surface 211A. The second connector 28 is a U-shaped nickel sheet. The second connector 28 includes a first segment 281, a second segment 282, and a third segment 283. The first segment 281 is connected to the first surface 211A, the third segment 283 is spaced apart from the first segment 281 along a third direction Z, and the second segment 282 is bent and connected between the first segment 281 and the third segment 283.

[0190] The electrode tab 13 includes a first extension segment 131, a second extension segment 132, and a third extension segment 133 connected in sequence. The first extension segment 131 extends from the bending portion 121A, the third extension segment 133 is located between the first segment 281 and the third segment 283 and connects to the first segment 281, and the second extension segment 132 is bent and connected between the first extension segment 131 and the third extension segment 133, which helps to improve the stability of the connection between the second connector 28 and the electrode tab 13.

[0191] Apart from the differences mentioned above, the parameters of battery 100H and battery 100C are roughly the same. Please refer to the description of battery 100C above.

[0192] Example 9 Please refer to the following: Figure 25 and Figure 26 An embodiment of this application also provides a battery 100I. The difference between battery 100I and battery 100A lies in the structure of the circuit board assembly 20.

[0193] The first sub-substrate 211 is located between the two protruding 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 connecting portion 291 and two fourth connecting portions 292. The third connecting portion 291 extends from the second wall 113 of one battery cell 10 to the second wall 113 of the other battery cell 10. Along the second direction Y, the two fourth connecting portions 292 are disposed at both ends of the third connecting 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 protruding corners 12A through the fourth flexible circuit board 29. The fourth flexible circuit board 29 is disposed 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 beneficial to improving the energy density of the battery 100I.

[0194] In some embodiments, when viewed along the first direction X, the third connecting portion 291 extends along the second direction Y, the fourth connecting portion 292 extends along the third direction Z, and the fourth flexible circuit board 29 has a "U" shaped structure so that the two ends of the fourth flexible circuit board 29 are subjected to uniform force.

[0195] In some embodiments, the top wall 111 includes a second top surface 111B located 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, where W3 > W4, that is, the first top surface 111A is the deep pit surface of the battery 100I, and the second top surface 111B is the shallow pit surface of the battery 100I.

[0196] Please see Figure 27 In some embodiments, the battery 100 further includes a wrapping film 90, which connects the second walls 113 of the two cells 10. 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 100.

[0197] Optionally, the wrapping film 90 is an adhesive layer or an easy-tear sticker.

[0198] It is understood that in some embodiments, the terminal device has a clearance groove at the part corresponding to the fourth flexible circuit board 29 so that the fourth flexible circuit board 29 can utilize the space of the terminal device.

[0199] Apart from the differences mentioned above, the parameters of battery 100I and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0200] Example 10 Please refer to the following: Figure 28 and Figure 29An embodiment of this application also provides a battery 100J. The difference between battery 100J and battery 100A lies in the structure of the encapsulation portion 12 of the cell 10 and the structure of the circuit board assembly 20.

[0201] The substrate 21 includes a third sub-substrate 213. Along the third direction Z, the third sub-substrate 213 is disposed on the side of two adjacent protruding corner portions 12A away from the top wall 111. Along the second direction Y, 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. Viewed along the first direction X, the substrate 21 is located on the side of two adjacent protruding corner portions 12A away from the top wall 111.

[0202] Please refer to the following: Figure 29 and Figure 30 A first chamfer 14 is provided at the junction of the side sealing extension 122A and the second bending section 1212. The first chamfer 14 includes a first side 141 and a second side 142. The first side 141 is located in the side sealing extension 122A, and the second side 142 is located in 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, where 0.5mm ≤ H6 ≤ 1.5mm. The first chamfer 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 beneficial to increasing the volume of the main body portion 11 to improve the capacity and energy density of the battery 100J.

[0203] Understandably, when H6 is too small (less than 0.5mm), it can easily lead to a reduction in the packaging strength of the convex corner 12A.

[0204] Optionally, H6 can be one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or any other value within the range of 0.5mm≤H6≤1.5mm.

[0205] Please refer to it again. Figure 29 and Figure 30 In some embodiments, the circuit board assembly 20 includes a fourth electronic component 201, which is disposed on the surface of the first sub-substrate 211 near the first bending section 1211, so that the fourth electronic component 201 and the protruding corner portion 12A share the space in the third direction Z, thereby reducing the space occupied by the circuit board assembly 20 in the third direction Z, which is beneficial to increasing the volume of the main body portion 11 to improve the capacity and energy density of the battery 100J.

[0206] In some embodiments, the circuit board assembly 20 includes a third connector 202, which is disposed on the surface of the first sub-substrate 211 away from the first bending section 1211 and connected to the tab 13 of the corresponding battery cell 10, so as to reduce the risk of interference between the third connector 202 and the fourth electronic component 201 and facilitate component placement.

[0207] It is understood that in some embodiments, the circuit board assembly 20 includes a third connector 202, which is disposed on the surface of the first sub-substrate 211 near the first bending section 1211 and connected to the tab 13 of the corresponding cell 10, so that the third connector 202 and the protruding corner portion 12A share the space in the third direction Z, thereby reducing the space occupied by the circuit board assembly 20 in the third direction Z, which is beneficial to improving the energy density of the battery 100J.

[0208] Apart from the differences mentioned above, the parameters of battery 100J and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0209] Example 11 Please see Figure 31 An embodiment of this application also provides a terminal device 200, including the battery (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J) in any of the above embodiments.

[0210] Optionally, the terminal device 200 may be a device with a rechargeable battery, such as a mobile phone, tablet computer, laptop computer, smart wearable product (e.g., smartwatch, smart bracelet), virtual reality (VR) terminal device, augmented reality (AR) terminal device, etc.

[0211] Example 12 Please see Figure 32 An embodiment of this application also provides a terminal device 200B, including a motherboard 95, a battery 100K and a first protection device 96. The difference between battery 100K and battery 100A is that the first protection device 24 of battery 100A is moved outside the second flexible circuit board 23.

[0212] 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 and electrically connected along a second direction Y. Each first sub-substrate 211 is disposed at a first bending segment 1211 and connected to a corresponding tab 13. The first flexible circuit board 22 includes a first connecting portion 221 and two second connecting portions 222. Along a third direction Z, the first connecting portion 221 is disposed on the side of two adjacent convex corner portions 12A away from the top wall 111. Along the second direction Y, the two second connecting portions 222 are disposed at both ends of the first connecting portion 221, and each second connecting portion 222 is connected to one of the first sub-substrates 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.

[0213] 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 separate from the battery cell 10 and is configured to be electrically connected to an external circuit.

[0214] The first protection device 96 is disposed on the main board 95 and configured to form a protection circuit with the circuit board assembly 20 to protect the battery cell 10, thereby reducing the space waste caused by placing the protection circuit at the head of the battery 100K and improving the energy density of the battery 100K. Furthermore, by disposing of 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 facilitates the layout of the overcurrent lines on the first flexible circuit board 22 and thus improves the overcurrent capacity of the first flexible circuit board 22.

[0215] In summary, in the aforementioned 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. Each first sub-substrate 211 is disposed on a first bending section 1211 and connected to a corresponding tab 13, so as to avoid two adjacent protruding corners 12A. This helps to reduce the risk of interference between the two adjacent protruding corners 12A and the substrate 21, and further facilitates the placement of the circuit board assembly 20 on one side of the two cells 10.

[0216] In addition, those skilled in the art may make other changes within the spirit of this application. Of course, all such changes made in accordance with the spirit of this application should be included within the scope disclosed in this application.

Claims

1. A battery, characterized in that, The battery includes: Two battery cells are provided, with their thickness direction defined as a first direction. Viewed along this first direction, the two cells are arranged along a second direction. Each cell includes a main body, a package, and tabs. The main body includes a top wall, a first wall and a second wall connected to the top wall along the first direction, and two side walls connected to the top wall along the second direction. The package includes a top seal connected to the top wall and side seals connected to the side walls. The top seal includes a bent portion and a root portion connected between the bent portion and the top wall. The top wall includes a first top surface located between the root portion and the first wall. The bent portion faces... The first top surface is bent, and the bent portion includes a first bent segment and a second bent segment connected to both ends of the first bent segment along the second direction. The first bent segment is disposed opposite to the top wall along a third direction. The second bent segment extends from the first bent segment along the third direction in a direction away from the top wall. The electrode extends from the first bent segment. The side sealing portion is bent in a direction toward the first wall. The side sealing portion includes a side sealing extension protruding from the top wall along a third direction. The side sealing extension connects to the second bent segment to form a convex corner portion. The first direction, the second direction, and the third direction are perpendicular to each other. A circuit board assembly, the circuit board assembly including a substrate, the substrate including two first sub-substrates arranged along a second direction and electrically connected, each of the first sub-substrates being disposed in a first bending segment and connected to the corresponding tab.

2. The battery as described in claim 1, characterized in that, The first sub-substrate is located between the two convex corner portions 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 disposed on the side away from the top wall of two adjacent convex corner portions. Along the second direction, the two second connecting portions are disposed 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 separate from the battery cell. The second flexible circuit board is configured to be electrically connected to an external circuit. The first protective device is disposed on the second flexible circuit board.

3. The battery as described in 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 disposed with the two third flexible circuit boards.

4. The battery as described in 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 and extends in a direction away from the top wall. The second part is connected to the end of the first part away from the top wall. The first PCB board is disposed on the second part. The first electronic component is disposed on the surface of the first PCB board away from the second part. The third part is connected to the second part and configured to be electrically connected to an external circuit.

5. The battery as described in claim 4, characterized in that, The circuit board assembly further includes an injection molding section disposed in the second part, wherein the second part, the first PCB board, and the first electronic component are located within the injection molding section.

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

7. The battery as described in claim 6, characterized in that, The circuit board assembly includes a second protection device disposed on the surface of the substrate away from the top wall, along the third direction, and the height of the second protection device is H3, where H3≤L3.

8. The battery as claimed in claim 7, characterized in that, The circuit board assembly includes two first connectors, which are disposed on the surface of the substrate away from the top wall and connected to the corresponding electrode tab of the battery cell. The two first connectors are spaced apart along the second direction, and the second protection device is located between the two first connectors.

9. The battery as claimed in claim 1, characterized in that, The first sub-substrate is located between the two convex corner portions 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 two adjacent convex corners near the first wall, and the second sub-substrate and the first top surface are disposed opposite 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 first sub-substrate and the first bent section of a battery cell are disposed opposite each other along the third direction. The second sub-substrate and the two first sub-substrates are integrally disposed.

10. The battery as claimed in claim 9, characterized in that, Along the first direction, the distance between the first bent section and the first wall is D1, and the distance between two adjacent side sealing extensions and the first wall is D2, where D1 < D2, and 0.15mm ≤ D2 - D1 ≤ 0.25mm.

11. The battery as claimed in claim 9, characterized in that, The side sealing extension has a first notch on the side near the first wall, and a portion of the second sub-substrate is located in the first notch.

12. The battery as claimed in 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 disposed opposite to the second sub-substrate along the first direction. The second edge extends along the first direction and is disposed 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 as claimed in claim 9 or 11, characterized in that, The circuit board assembly includes a third electronic component disposed on the surface of the first sub-substrate near the first bent section.

14. The battery as claimed in claim 9 or 11, characterized in that, The bent portion includes a first side away from the root portion, the first side being provided with a second notch, and along the second direction, the second notch is close to two adjacent side sealing extensions; The second notch has a third edge and a fourth edge. The third edge extends along the first direction and is disposed opposite to the second sub-substrate along the third direction. 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 disposed opposite to two adjacent fourth edges.

15. The battery as claimed in 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 disposed opposite to each other along the third direction, and the first surface is close to the top wall and the second surface is away from the top wall. The third surface and the fourth surface are disposed opposite 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 connected to the first sub-substrate, the second connector being connected to the tab and forming a joint, the joint being located on the third surface.

16. The battery as claimed in 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 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, and the distance between the first concave surface and the first wall is D6, where D5 < D6 and 0.2mm ≤ D6 - D5 ≤ 0.8mm. The first connecting surface connects the first body surface and the first concave surface. Along the first direction, the joint is located on the first concave surface, and along the second direction, the joint overlaps with the first connecting surface.

17. The battery as claimed in claim 10 or 12, characterized in that, The top wall includes a second top surface located between the root and the second wall; The battery includes a second insulating member, which includes a first insulating portion, a second insulating portion, and a third insulating portion. Along the third direction, the first insulating portion is disposed on the side away from the top wall of two adjacent convex corner portions. 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 corner portions. When viewed along the first direction, the second insulating portion covers the gap between the two first top surfaces and the two adjacent convex corner portions. The third insulating portion covers the gap between the two second top surfaces and the two adjacent convex corner portions. The battery includes an injection molded part that connects the second insulating member and the area of ​​the top wall that is separate from the second insulating member. The injection molded part covers the top seal, the tab, and the substrate.

18. The battery as claimed in claim 1, characterized in that, The first sub-substrate is located between the two convex corner portions of the battery cell along the second direction; The circuit board assembly includes a fourth flexible circuit board, which 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 the other battery cell. Along the second direction, the two fourth connecting portions are disposed at both ends of the third connecting portion and are electrically connected to a corresponding first sub-substrate.

19. The battery as claimed in claim 18, characterized in that, 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, where W3 > W4. The battery includes a wrapping film that connects the second walls of the two cells. When viewed along the first direction, the wrapping film is spaced apart from the fourth flexible circuit board.

20. The battery as claimed in claim 1, characterized in that, The substrate includes a third sub-substrate. Along the third direction, the third sub-substrate is disposed on the side away from the top wall of two adjacent convex corner portions. Along the second direction, two first sub-substrates are disposed at both ends of the third sub-substrate. The third sub-substrate and the two first sub-substrates are integrally disposed. A first chamfer is provided at the junction of the side sealing extension and the second bending section. The first chamfer includes a first side and a second side. The first side is located in the side sealing extension and the second side is located in 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, where 0.5mm≤H6≤1.5mm.

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

22. A terminal device, characterized in that, The terminal device includes a battery as described in any one of claims 1 to 21.

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