Battery and terminal device

Abstract

The invention discloses a battery and a terminal device. The battery comprises two battery cells and a circuit board assembly, and the thickness direction of the two battery cells is a first direction. And the two battery cells are arranged along the second direction when being observed along the first direction. The battery cell comprises a main body part, a packaging part and a tab, the circuit board assembly comprises a first flexible circuit board, two substrates, a second flexible circuit board and a first protection device. Each substrate is arranged on the top wall of one battery cell, and the substrates are electrically connected with the tabs of the corresponding battery cells. The first flexible circuit board comprises a first connecting part and two second connecting parts, the first connecting part is arranged on the sides, away from the top wall, of the two adjacent convex corner parts in the third direction, the two second connecting parts are arranged at the two ends of the first connecting part in the second direction, and each second connecting part is electrically connected with one substrate. The second flexible circuit board extends from the first flexible circuit board in a direction away from the top wall. The first protection device is arranged on the second flexible circuit board. The battery is favorable for improving the energy density.

Description

Technical Field

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

[0002] In existing dual-cell structure batteries, convex corners are provided at adjacent corners of the two cells. A larger gap needs to be set between the circuit board assembly and the cell to avoid the two adjacent convex corners. This will cause the circuit board assembly to occupy a larger space at the head of the battery, resulting in a decrease in the energy density of the battery. Summary of the invention

[0003] In view of the above situation, the present application provides a battery that is beneficial to improving energy density.

[0004] An embodiment of the present application provides a battery, the battery comprising two cells and a circuit board assembly. The thickness direction of the two cells is a first direction. When viewed along the first direction, the two cells are arranged along a second direction. The cell comprises a main body, a packaging portion and a tab. The main body comprises a top wall, and the packaging portion comprises a top sealing portion arranged on the top wall. The top sealing portion comprises a bending portion and convex corner portions arranged at both ends of the bending portion along the second direction, the bending portion is bent toward the top wall, the tab extends from the bending portion, and the convex corner portion extends in a direction away from the top wall along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The circuit board assembly comprises a first flexible circuit board, two substrates, a second flexible circuit board and a first protective device. Each substrate is arranged at the bending portion of a cell, the substrate and the bending portion are arranged opposite to each other along the third direction and are electrically connected to the tab of the corresponding cell, and the substrate is located between the two convex corner portions of the cell along the second direction. The first flexible circuit board includes a first connection portion and two second connection portions. Along the third direction, the first connection portion is arranged on a side of two adjacent convex corner portions away from the top wall. Along the second direction, the two second connection portions are arranged at both ends of the first connection portion, and each second connection portion is electrically connected to a substrate. The second flexible circuit board extends from the first flexible circuit board in a direction away from the top wall. When viewed along the first direction, the second flexible circuit board is separated from the battery cell, and the second flexible circuit board is configured to be electrically connected to an external circuit. The first protection device is arranged on the second flexible circuit board.

[0005] In the above-mentioned battery, each substrate is arranged on the top wall of a battery cell, and the substrate is located between the two convex corners of the battery cell along the second direction, so that the substrate and the convex corner share the space in the third direction, which can reduce the space occupied by the circuit board assembly at the battery head, thereby facilitating the improvement of the energy density of the battery. Along the third direction, the first connection portion is arranged on the side away from the top wall of the two adjacent convex corners. Along the second direction, the two second connection portions are arranged at both ends of the first connection portion, so that the first flexible circuit board avoids the two adjacent convex corners. The first protection device is arranged on the second flexible circuit board, so that the first protection device is away from the top seal portion, which facilitates the first protection device to utilize the space of the accommodating cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly at the battery head, thereby facilitating the improvement of the energy density of the battery. In addition, by arranging the first protection device on the second flexible circuit board, the number of connection lines required on the first flexible circuit board can be reduced, which is conducive to the layout of the overcurrent circuit on the first flexible circuit board, thereby facilitating the improvement of the overcurrent capacity of the first flexible circuit board.

[0006] In some embodiments of the present application, along the first direction, the width of the first flexible circuit board is L1, the thickness of the battery cell is L2, L1≤L2, so as to reduce the space waste caused by the first flexible circuit board protruding from the battery cell along the first direction. And 2mm≤L1≤6mm, so as to improve the current carrying capacity of the first flexible circuit board, and help to reduce the space waste caused by the first flexible circuit board protruding from the battery cell along the first direction.

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

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

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

[0010] In some embodiments of the present application, the circuit board assembly further includes an injection molding portion disposed on the second portion, and the second portion, the first PCB board, and the first electronic component are located in the injection molding portion. The injection molding portion is used to improve the drop resistance of the first protection device and the second portion. In addition, the injection molding portion can also contact with external structural parts such as the cavity wall of the accommodating cavity of the terminal device to transfer the heat generated by the first protection device to the external structural parts, which is conducive to reducing the temperature rise of the first protection device.

[0011] In some embodiments of the present application, the first protection device includes a second electronic component, and the second electronic component is disposed on a surface of the first PCB board away from the second part. Along the arrangement direction of the second part and the first PCB board, the height of the second electronic component is H1, and the distance between the surface of the injection molding part away from the first PCB board and the first PCB board is H2, and H1≤H2. A concave portion is provided on the surface of the injection molding part away from the first PCB board, and the end face of the second electronic component away from the first PCB board is exposed from the concave portion, which is conducive to reducing the overall thickness of the second part, the first protection device and the injection molding part.

[0012] In some embodiments of the present application, when observed along the arrangement direction of the second portion and the first PCB board, the peripheral edge of the first PCB board is located inside the peripheral edge of the injection-molded portion, and the spacing between the peripheral edge of the first PCB board and the peripheral edge of the injection-molded portion is W1, 0.2mm≤W1≤0.5mm, so as to reduce the risk of the injection-molded portion being too thin and easily damaged, and reduce the space waste caused by the injection-molded portion protruding too much relative to the second portion.

[0013] In some embodiments of the present application, along the third direction, there is a height difference of L3 between the first connection portion and the substrate. The second connection portion extends from the first connection portion in a direction toward the top wall, and along the second direction, the second connection portion is arranged opposite to two adjacent convex corner portions, so that the first flexible circuit board forms an inverted "U"-shaped structure, which is conducive to the first flexible circuit board avoiding the two adjacent convex corner portions.

[0014] In some embodiments of the present application, the circuit board assembly includes a second protection device, and the second protection device is disposed on a surface of the substrate away from the top wall. Along the third direction, the height of the second protection device is H3, H3≤L3, so as to reduce the space waste caused by the second protection device protruding from the first connection portion, which is beneficial to reducing the space occupied by the circuit board assembly at the battery head, thereby facilitating improving the energy density of the battery.

[0015] In some embodiments of the present application, the circuit board assembly includes two first connectors, which are arranged on the surface of the substrate away from the top wall and connected to the corresponding tabs of the battery cell, so that the first connector and the convex corner portion share the space in the third direction, which can reduce the space occupied by the circuit board assembly at the battery head, thereby facilitating the improvement of the energy density of the battery. Along the second direction, the two first connectors are arranged at intervals, and the second protection device is located between the two first connectors for easy layout.

[0016] In some embodiments of the present application, the first connector includes a first section, a second section and a third section, the first section is arranged on the surface of the substrate away from the top wall, the second section is located on the side of the first section away from the substrate and is spaced apart from the first section along the third direction, and the third section is arranged between the first section and the second section. The tab includes a first extension section extending along the first direction, and the first extension section is arranged between the first section and the second section to improve the stability of the connection between the first connector and the tab. Along the third direction, the sum of the thicknesses of the first section, the second section and the first extension section is H4, H3≤H4, to reduce the risk of the second protective device protruding from the first connector and interfering with other structural parts.

[0017] In some embodiments of the present application, the battery includes a first buffer, a first protective member and a second protective member. The first buffer includes a first buffer portion and two second buffer portions. Along the second direction, the two second buffer portions are arranged at both ends of the first buffer portion, the first buffer portion is arranged between the first flexible circuit board and two adjacent convex corner portions, and the second buffer portion is arranged between the substrate and the bending portion, so as to play a buffering role when the battery head is impacted by external force, thereby reducing the risk of damage to the battery head. The first protective member is arranged on the surface of the first buffer close to the circuit board assembly, so as to play an anti-puncture role when the battery head is impacted by external force, thereby reducing the risk of damage to the battery head. The second protective member is arranged on the side of the substrate away from the top wall, so as to protect the part where the substrate is connected to the pole ear, thereby improving the stability of the electrical connection between the substrate and the pole ear.

[0018] An embodiment of the present application further provides a terminal device, which includes any one of the batteries in the above embodiments.

[0019] In the above-mentioned battery and terminal device, each substrate is arranged on the top wall of a battery cell, and the substrate is located between the two convex corners of the battery cell along the second direction, so that the substrate and the convex corner share the space in the third direction, which can reduce the space occupied by the circuit board assembly at the battery head, thereby facilitating the improvement of the energy density of the battery. Along the third direction, the first connection portion is arranged on the side away from the top wall of the two adjacent convex corners. Along the second direction, the two second connection portions are arranged at both ends of the first connection portion, so that the first flexible circuit board avoids the two adjacent convex corners. The first protection device is arranged on the second flexible circuit board, so that the first protection device is away from the top seal portion, which facilitates the first protection device to utilize the space of the accommodating cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly at the battery head, thereby facilitating the improvement of the energy density of the battery. In addition, by arranging the first protection device on the second flexible circuit board, the number of connection lines required on the first flexible circuit board can be reduced, which is conducive to the layout of the overcurrent circuit on the first flexible circuit board, thereby facilitating the improvement of the overcurrent capacity of the first flexible circuit board.

[0020] The embodiment of the present application also provides a terminal device, which includes a main board, a battery and a first protection device, and the battery includes two battery cells and a circuit board assembly. The thickness direction of the two battery cells is the first direction. When viewed along the first direction, the two battery cells are arranged along the second direction. The battery cell includes a main body, a packaging part and a pole ear. The main body includes a top wall, and the packaging part includes a top sealing part arranged on the top wall. The top sealing part includes a bending part and a convex corner part arranged at both ends of the bending part along the second direction, the bending part is bent toward the top wall, the pole ear extends from the bending part, and the convex corner part extends in a direction away from the top wall along the third direction. The first direction, the second direction and the third direction are perpendicular to each other. The circuit board assembly includes a first flexible circuit board, two substrates, a second flexible circuit board and a first protection device. Each substrate is arranged at the bending part of a battery cell, the substrate and the bending part are arranged opposite to each other along the third direction and are electrically connected to the pole ear of the corresponding battery cell, and the substrate is located between the two convex corner parts of the battery cell along the second direction. The first flexible circuit board includes a first connection part and two second connection parts. Along the third direction, the first connection part is arranged on the side of two adjacent convex corner parts away from the top wall. Along the second direction, the two second connection parts are arranged at both ends of the first connection part, and each second connection part is electrically connected to a substrate. The second flexible circuit board extends from the first flexible circuit board in a direction away from the top wall. When viewed along the first direction, the second flexible circuit board is separated from the battery cell, and the second flexible circuit board is configured to be electrically connected to an external circuit. The first protection device is arranged on the main board, and the first protection device is configured to form a protection circuit for protecting the battery cell with the circuit board assembly to reduce the space waste caused by setting the protection circuit on the head of the battery, which is beneficial to improve the energy density of the battery. In addition, by arranging the first protection device on the main board, the number of connection lines required on the first flexible circuit board can be reduced, which is beneficial to the layout of the overcurrent circuit on the first flexible circuit board, and then it is beneficial to improve the overcurrent capacity of the first flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0022] Figure 2 It is a schematic diagram of the disassembled structure of the battery head in one embodiment of the present application.

[0023] Figure 3 yes Figure 1 Sectional view along section line III-III.

[0024] Figure 4 It is a structural schematic diagram of an embodiment of the present application in which the injection molding portion of the battery is provided with a recess.

[0025] Figure 5 It is a schematic structural diagram of a first buffer member, a first protective member, a second protective member and a first insulating member of a battery in an embodiment of the present application.

[0026] Figure 6 It is a schematic diagram of the structure of a battery in another embodiment of the present application.

[0027] Figure 7 It is a schematic diagram of the structure of a circuit board assembly of a battery in one embodiment of the present application.

[0028] Figure 8 It is a schematic diagram of the structure of a terminal device in an embodiment of the present application.

[0029] Fig. 9 It is a schematic diagram of the structure of a terminal device in another embodiment of the present application.

[0030] Main component symbols Batteries 100A, 100B, 100C Terminal devices 200A, 200B Battery 10 Main body 11 Top wall 111 Packaging unit 12 Top seal 121 Bending portion 121A Protruding corner portion 121B Tab 13 The first extension section 131 Circuit board assembly 20 First flexible circuit board 21 First connection portion 211 The second connection portion 212 Substrate 22 The third flexible circuit board 221 Reinforcement plate 222 Second flexible printed circuit board 23 Part 1231 Part 2232 Adhesive 2321 Part 3 233 Connector 2331 Reinforcement 2332 First protection device 24, 80 First PCB board 241 First electronic component 242 Second electronic component 243 Injection molding department 25 Recess 251 First connecting member 26 First paragraph 261 262 Section 3 263 The second protection device 27 The first buffer member 30 First buffer portion 31 Second buffer portion 32 The first protection member 40 The first protection part 41 The second protection part 42 The second protection member 50 The first insulating member 60 Motherboard 70 First direction X Second direction Y The third direction Z The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0032] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally arranged element at the same time. When an element is considered to be "set" on another element, it may be directly set on the other element or there may be a centrally arranged element at the same time. It should be understood that, considering the factors of actual processing tolerance, in the technical solution of the present application, when two elements are set parallel / vertically and in the same direction, there may be a certain angle between the two elements, and the angle between the two elements is allowed to have a tolerance of 0-±10%.

[0033] When a value is considered to be "equal" to another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be roughly equal. When a value is considered to be in a "1:1" ratio with another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be equal in ratio.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items. The term "overlap" used herein refers to the overlap of the projections of two parts or the overlap of the projections of two parts.

[0035] One embodiment of the present application provides a battery, the battery comprising two cells and a circuit board assembly. The thickness direction of the two cells is a first direction. When viewed along the first direction, the two cells are arranged along a second direction. The cell comprises a main body, a packaging portion and a tab. The main body comprises a top wall, and the packaging portion comprises a top sealing portion arranged on the top wall. The top sealing portion comprises a bending portion and convex corner portions arranged at both ends of the bending portion along the second direction, the bending portion is bent toward the top wall, the tab extends from the bending portion, and the convex corner portion extends in a direction away from the top wall along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The circuit board assembly comprises a first flexible circuit board, two substrates, a second flexible circuit board and a first protective device. Each substrate is arranged at the bending portion of a cell, the substrate and the bending portion are arranged opposite to each other along the third direction and are electrically connected to the tab of the corresponding cell, and the substrate is located between the two convex corner portions of the cell along the second direction. The first flexible circuit board includes a first connection portion and two second connection portions. Along the third direction, the first connection portion is arranged on a side of two adjacent convex corner portions away from the top wall. Along the second direction, the two second connection portions are arranged at both ends of the first connection portion, and each second connection portion is electrically connected to a substrate. The second flexible circuit board extends from the first flexible circuit board in a direction away from the top wall. When viewed along the first direction, the second flexible circuit board is separated from the battery cell, and the second flexible circuit board is configured to be electrically connected to an external circuit. The first protection device is arranged on the second flexible circuit board.

[0036] In the above-mentioned battery, each substrate is arranged on the top wall of a battery cell, and the substrate is located between the two convex corners of the battery cell along the second direction, so that the substrate and the convex corner share the space in the third direction, which can reduce the space occupied by the circuit board assembly at the battery head, thereby facilitating the improvement of the energy density of the battery. Along the third direction, the first connection portion is arranged on the side away from the top wall of the two adjacent convex corners. Along the second direction, the two second connection portions are arranged at both ends of the first connection portion, so that the first flexible circuit board avoids the two adjacent convex corners. The first protection device is arranged on the second flexible circuit board, so that the first protection device is away from the top seal portion, which facilitates the first protection device to utilize the space of the accommodating cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly at the battery head, thereby facilitating the improvement of the energy density of the battery. In addition, by arranging the first protection device on the second flexible circuit board, the number of connection lines required on the first flexible circuit board can be reduced, which is conducive to the layout of the overcurrent circuit on the first flexible circuit board, thereby facilitating the improvement of the overcurrent capacity of the first flexible circuit board.

[0037] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0038] Example 1 Please also read Figure 1 and Figure 2One embodiment of the present application provides a battery 100A. The battery 100A may be, but is not limited to, a secondary battery. A secondary battery refers to a battery that can be continuously used by activating active materials by charging after the battery is discharged.

[0039] 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.

[0040] The battery cell 10 includes a main body 11, a packaging part 12 and a tab 13. The main body 11 and the packaging part 12 are made of a packaging film by punching, folding and heat sealing. The main body 11 is the part where the packaging film is provided with punching positions, and the packaging part 12 is the part where the packaging film overlaps and is joined.

[0041] The main body 11 includes a top wall 111, and the top wall 111 is arranged adjacent to the circuit board assembly 20. The packaging part 12 includes a top sealing part 121 arranged on the top wall 111. The top sealing part 121 includes a bending part 121A and convex corner parts 121B arranged at both ends of the bending part 121A along the second direction Y. The bending part 121A is bent toward the top wall 111. Specifically, the bending part 121A and the top wall 111 are arranged opposite to each other along the third direction Z. The pole ear 13 extends from the bending part 121A and is electrically connected to the circuit board assembly 20. The convex corner part 121B extends in the direction away from the top wall 111 along the third direction Z. Specifically, the convex corner part 121B is a folded corner formed by the packaging part 12 at the corner position of the main body 11.

[0042] 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 .

[0043] Please continue reading Figure 1 and Figure 2 The circuit board assembly 20 includes a first flexible circuit board 21, two substrates 22, a second flexible circuit board 23 and a first protective device 24. Each substrate 22 is arranged at a bending portion 121A of a battery cell 10, and the substrate 22 and the bending portion 121A are arranged opposite to each other along the third direction Z and are electrically connected to the corresponding tab 13 of the battery cell 10. The substrate 22 is located between the two convex corners 121B of the battery cell 10 along the second direction Y, so that the substrate 22 and the convex corner 121B share the space in the third direction Z, which can reduce the space occupied by the circuit board assembly 20 at the head of the battery 100A, thereby facilitating the improvement of the energy density of the battery 100A.

[0044] The first flexible circuit board 21 includes a first connection portion 211 and two second connection portions 212. Along the third direction Z, the first connection portion 211 is disposed on a side of two adjacent convex corner portions 121B away from the top wall 111. Along the second direction Y, the two second connection portions 212 are disposed at both ends of the first connection portion 211, and each second connection portion 212 is electrically connected to a substrate 22, so that the two substrates 22 are electrically connected through the first flexible circuit board 21, and the circuit board assembly 20 avoids the two adjacent convex corner portions 121B through the first flexible circuit board 21.

[0045] The second flexible circuit board 23 extends from the first flexible circuit board 21 in a direction away from the top wall 111. When viewed along the first direction X, the second flexible circuit board 23 is separated from the battery cell 10. The second flexible circuit board 23 is configured to be electrically connected to an external circuit. Optionally, the external circuit is a mainboard of an external terminal device.

[0046] The first protection device 24 is used to construct a protection circuit, which can provide, but is not limited to, protection functions such as overcharge, over-discharge, overcurrent, short circuit and anti-counterfeiting to the battery cell 10. The first protection device 24 is arranged on the second flexible circuit board 23 so that the first protection device 24 is away from the top seal portion 121, so that the first protection device 24 can use the space of the accommodating cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly 20 at the head of the battery 100A, which is beneficial to improving the energy density of the battery 100A. In addition, the existing battery structure usually sets the protection device on the substrate, and the flexible circuit board connected to the substrate needs to be additionally provided with a connection line electrically connected to the protection device in addition to the overcurrent line. By setting the first protection device 24 on the second flexible circuit board 23, the number of connection lines required on the first flexible circuit board 21 can be reduced, which is beneficial to the layout of the overcurrent line on the first flexible circuit board 21, and thus is beneficial to improving the overcurrent capacity of the first flexible circuit board 21.

[0047] Please continue reading Figure 2 In some embodiments, along the first direction X, the width of the first flexible circuit board 21 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 21 protruding from the battery cell 10 along the first direction X.

[0048] In some embodiments, 2mm≤L1≤6mm, when L1 is too small (less than 2mm), the first flexible circuit board 21 may fail to meet the overcurrent requirement; when L1 is too large (greater than 6mm), the first flexible circuit board 21 may protrude from the battery cell 10 along the first direction X. By limiting 2mm≤L1≤6mm, the overcurrent capacity of the first flexible circuit board 21 is improved, and the space waste caused by the first flexible circuit board 21 protruding from the battery cell 10 along the first direction X is reduced.

[0049] Optionally, L1 is 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, and any other value satisfying the range of 2 mm ≤ L1 ≤ 6 mm.

[0050] In some embodiments, the first flexible circuit board 21 includes a conductive copper layer, and the number of the conductive copper layer is 2, so as to facilitate bending of the first flexible circuit board 21 .

[0051] It should be noted that the first flexible circuit board 21 is a rectangular sheet structure in the unfolded state, the width of the sheet structure is L1, and the width thickness of the sheet structure is D1. Correspondingly, the width of the first connecting portion 211 and the two second connecting portions 212 are equal and are both L1, and the thickness of the first connecting portion 211 and the two second connecting portions 212 are equal and are both D1.

[0052] In some embodiments, along the third direction Z, there is a height difference L3 between the first connection portion 211 and the substrate 22. The second connection portion 212 extends from the first connection portion 211 in a direction toward the top wall 111, and along the second direction Y, the second connection portion 212 is disposed opposite to two adjacent convex corner portions 121B, so that the first flexible circuit board 21 forms an inverted "U"-shaped structure, which is beneficial for the first flexible circuit board 21 to avoid the two adjacent convex corner portions 121B.

[0053] Please continue reading Figure 2 In some embodiments, the substrate 22 includes a third flexible circuit board 221 and a reinforcement plate 222, and the third flexible circuit board 221 and the reinforcement plate 222 are stacked along the third direction Z. The third flexible circuit board 221 is electrically connected to the corresponding tab 13 of the battery cell 10, the second connection portion 212 is connected to the third flexible circuit board 221, and the first flexible circuit board 21 is integrally arranged with the two third flexible circuit boards 221 to improve the stability of the electrical connection between the first flexible circuit board 21 and the two substrates 22. The reinforcement plate 222 is used to support the third flexible circuit board 221 to improve the structural stability of the third flexible circuit board 221.

[0054] Optionally, the reinforcing plate 222 is disposed on a surface of the third flexible circuit board 221 close to the top wall 111 , or the reinforcing plate 222 is disposed on a surface of the third flexible circuit board 221 away from the top wall 111 .

[0055] It is understandable that, in some embodiments, the reinforcing plate 222 is replaced by a PCB board.

[0056] Please continue reading Figure 2In some embodiments, the first protection device 24 includes a first PCB board 241 and a first electronic component 242. The second flexible circuit board 23 includes a first portion 231, a second portion 232 and a third portion 233. The first portion 231 is connected to the substrate 22 or the first flexible circuit board 21, and the first portion 231 extends in a direction away from the top wall 111. The second portion 232 is connected to an end of the first portion 231 away from the top wall 111, the first PCB board 241 is disposed on the second portion 232, and the first electronic component 242 is disposed on a surface of the first PCB board 241 away from the second portion 232, so that the first protection device 24 is away from the top sealing portion 121. The third portion 233 is connected to the second portion 232 and is configured to be electrically connected to an external circuit.

[0057] In some embodiments, the third portion 233 is provided with a connector 2331 and a reinforcement piece 2332 on both side surfaces in the thickness direction thereof, respectively. The connector 2331 is configured to be electrically connected to an external circuit, and the reinforcement piece 2332 is used to improve the structural strength of the third portion 233 .

[0058] In some embodiments, an adhesive 2321 is provided on one side of the second portion 232 away from the first PCB board 241, and the adhesive 2321 is used to bond with the structure in the accommodating cavity of the terminal device to stably fix the second portion 232 and the first protective device 24 in the accommodating cavity of the terminal device.

[0059] In some embodiments, in a direction perpendicular to the arrangement direction of the first portion 231 and the second portion 232, the width of the second portion 232 is greater than the width of the first portion 231, so as to increase the connection area between the second flexible circuit board 23 and the first PCB board 241, and facilitate reducing the space occupied by the circuit board assembly 20 at the head of the battery 100A.

[0060] In some embodiments, in a direction perpendicular to the arrangement direction of the second portion 232 and the third portion 233, the width of the second portion 232 is greater than the width of the third portion 233, so as to increase the connection area between the second flexible circuit board 23 and the first PCB board 241, and help reduce the risk of interference with other structures when the third portion 233 is connected to an external circuit.

[0061] Please also read Figure 1 and Figure 2In some embodiments, the circuit board assembly 20 further includes an injection molding part 25 disposed on the second part 232, and the second part 232, the first PCB board 241 and the first electronic component 242 are located in the injection molding part 25. Specifically, the injection molding part 25 is formed on the outer side of the second part 232, the first PCB board 241 and the first electronic component 242 by melting the injection molding material through the injection molding equipment and then solidifying it. The injection molding part 25 is used to improve the anti-drop performance of the first protection device 24 and the second part 232. In addition, the injection molding part 25 can also contact with external structural parts such as the cavity wall of the accommodating cavity of the terminal device to transfer the heat generated by the first protection device 24 to the external structural parts, which is beneficial to reduce the temperature rise of the first protection device 24.

[0062] Optionally, the injection molding material includes at least one of polyamide, silicone resin and rubber.

[0063] It is understandable that, in some embodiments, the circuit board assembly 20 further includes an injection molding portion 25 disposed on the second portion 232, the injection molding portion 25 covers the surface of the first PCB board 241 away from the second portion 232, and the first electronic component 242 is located in the injection molding portion 25. Specifically, the injection molding portion 25 first encapsulates the first protection device 24 to form a packaging system (SIP, system in package), and then connects the packaging system to the second portion 232. The injection molding portion 25 is used to improve the drop resistance of the first protection device 24 and the second portion 232. In addition, the injection molding portion 25 can also contact with external structural parts such as the cavity wall of the accommodating cavity of the terminal device to transfer the heat generated by the first protection device 24 to the external structural parts, which is beneficial to reduce the temperature rise of the first protection device 24.

[0064] See also Figure 3 In some embodiments, when observed along the arrangement direction of the second portion 232 and the first PCB board 241, the outer peripheral edge of the first PCB board 241 is located inside the outer peripheral edge of the injection molding portion 25, and the distance between the outer peripheral edge of the first PCB board 241 and the outer peripheral edge of the injection molding portion 25 is W1, 0.2mm≤W1≤0.5mm, so as to reduce the risk of the injection molding portion 25 being too thin and easily damaged, and reduce the space waste caused by the injection molding portion 25 protruding too much relative to the second portion 232.

[0065] Optionally, W1 is one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm and any other value satisfying the range of 0.2 mm≤W1≤0.5 mm.

[0066] It should be noted that a plurality of measuring points are set between the outer peripheral edge of the second portion 232 and the outer peripheral edge of the injection portion 25 to measure W1, and W1 corresponding to the plurality of measuring points may be equal or unequal to meet the production tolerance requirement.

[0067] See also Figure 4 In some embodiments, the first protection device 24 includes a second electronic component 243, and the second electronic component 243 is disposed on a surface of the first PCB board 241 away from the second portion 232. The second electronic component 243 is arranged at intervals from the first electronic component 242, and the first electronic component 242 and the second electronic component 243 are used to construct a protection circuit.

[0068] Along the arrangement direction of the second part 232 and the first PCB board 241, the height of the second electronic component 243 is H1, and the distance between the surface of the injection molding part 25 away from the first PCB board 241 and the first PCB board 241 is H2, H1≤H2. The surface of the injection molding part 25 away from the first PCB board 241 is provided with a recess 251, and the end face of the second electronic component 243 away from the first PCB board 241 is exposed from the recess 251, which is conducive to thinning the overall thickness of the second part 232, the first protective device 24 and the injection molding part 25. Specifically, during the injection molding process of the existing electronic component, a sufficient gap needs to be reserved between the end face of the electronic component and the injection molding equipment for the injection molding material to flow, and then the injection molding part is solidified between the end face of the electronic component and the injection molding equipment, which will cause the injection molding part to be thickened. By setting the recess 251, the second electronic component 243 is exposed in the injection molding part 25, which is conducive to thinning the overall thickness of the second part 232, the first protective device 24 and the injection molding part 25.

[0069] In some embodiments, 1 mm ≤ H2 ≤ 3 mm, so as to improve the structural strength of the injection-molded portion 25 and reduce the space waste caused by the injection-molded portion 25 being too thick.

[0070] Optionally, H2 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, and any other value within the range of 1mm≤H2≤3mm.

[0071] Please refer again Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 includes a first connector 26, which is disposed on a surface of the substrate 22 away from the top wall 111 and connected to the corresponding ear 13 of the battery cell 10, so that the first connector 26 and the convex corner portion 121B share the space in the third direction Z, which can reduce the space occupied by the circuit board assembly 20 at the head of the battery 100A, thereby facilitating improving the energy density of the battery 100A.

[0072] Optionally, the first connecting member 26 is a nickel sheet or a nickel block.

[0073] See also Figure 5 In some embodiments, the battery 100A includes a first buffer member 30. The first buffer member 30 includes a first buffer portion 31 and two second buffer portions 32. The two second buffer portions 32 are disposed at both ends of the first buffer portion 31 along the second direction Y. The first buffer portion 31 is disposed between the first flexible circuit board 21 and the two adjacent convex corner portions 121B to play a buffering role when the head of the battery 100A is impacted by an external force, thereby reducing the risk of damage to the first flexible circuit board 21 or the two adjacent convex corner portions 121B. The second buffer portion 32 is disposed between the substrate 22 and the bending portion 121A to play a buffering role when the head of the battery 100A is impacted by an external force, thereby reducing the risk of damage to the substrate 22 or the bending portion 121A.

[0074] In some embodiments, the outer surface of the first buffer member 30 is adhesive to reduce the risk of the first buffer member 30 being misplaced.

[0075] Optionally, the first buffer member 30 is foam.

[0076] In some embodiments, the battery 100A includes a first protective member 40, which is disposed on the surface of the first buffer member 30 close to the circuit board assembly 20 to provide an anti-puncture function when the head of the battery 100A is impacted by external force, thereby reducing the risk of damage to the battery cell 10.

[0077] Specifically, the first protection member 40 includes a first protection portion 41 and two second protection portions 42, and the two second protection portions 42 are disposed at both ends of the first protection portion 41 along the second direction Y. The first protection portion 41 is disposed between the first flexible circuit board 21 and the first buffer portion 31, and the second protection portion 42 is disposed between the substrate 22 and the second buffer portion 32.

[0078] In some embodiments, the outer surface of the first protection member 40 is adhesive to reduce the risk of misalignment of the first buffer member 30 .

[0079] Optionally, the first buffer member 30 is DuPont paper.

[0080] In some embodiments, the battery 100A includes a second protective member 50 , which is disposed on a side of the substrate 22 away from the top wall 111 to protect the connection between the substrate 22 and the tab 13 and improve the stability of the electrical connection between the substrate 22 and the tab 13 .

[0081] 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 .

[0082] Optionally, the second protective member 50 is a silicone pad.

[0083] Furthermore, along the third direction Z, the projection of the substrate 22 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 , thereby facilitating the protection of the second protective member 50 against the surface of the substrate 22 away from the top wall 111 .

[0084] In some embodiments, the battery 100A includes a first insulating member 60 , which covers the convex corner portion 121B to improve the insulation stability between the convex corner portion 121B and the circuit board assembly 20 .

[0085] Optionally, the first insulating member 60 is a Mylar film.

[0086] Example 2 Please also read Figure 6 and Figure 7 One embodiment of the present application further provides a battery 100B. The difference between the battery 100B and the battery 100A is that the substrate 22 is provided with a second protection device.

[0087] The circuit board assembly 20 includes a second protective device 27, which is arranged on a surface of the substrate 22 away from the top wall 111. The second protective device 27 and the first protective device 24 are electrically connected through the substrate 22, the first flexible circuit board 21 and the second flexible circuit board 23. The second protective device 27 and the first protective device 24 are used to construct a protection circuit.

[0088] In some embodiments, along the third direction Z, the height of the second protection device 27 is H3, H3≤L3, so as to reduce the space waste caused by the second protection device 27 protruding from the first connecting portion 211, which is beneficial to reducing the space occupied by the circuit board assembly 20 at the head of the battery 100B, and further beneficial to improving the energy density of the battery 100B.

[0089] By setting the first protection device 24 on the second flexible circuit board 23 and the second protection device 27 on the substrate 22, it is advantageous to group and configure the protection devices according to factors such as the performance and size of the protection devices. Specifically, with L3 as the preset threshold, the protection device with a height greater than L3 is set on the second flexible circuit board 23 as the first protection device 24, and at least part of the protection device with a height less than L3 is set on the substrate 22 as the second protection device 27, so as to meet the requirements of the protection circuit while reducing the space occupied by the circuit board assembly 20 at the head of the battery 100A, which is beneficial to improve the energy density of the battery 100A.

[0090] In some embodiments, 0.1 mm≤H3≤0.5 mm, which helps to reduce the space waste caused by the second protection device 27 protruding out of the first connection portion 211.

[0091] In some embodiments, the circuit board assembly 20 includes two first connectors 26 , which are spaced apart along the second direction Y, and the second protection device 27 is located between the two first connectors 26 for easy layout.

[0092] In some embodiments, the first connector 26 is a "U"-shaped nickel sheet. The first connector 26 includes a first section 261, a second section 262, and a third section 263. The first section 261 is disposed on a surface of the substrate 22 away from the top wall 111, the second section 262 is located on a side of the first section 261 away from the substrate 22 and is spaced apart from the first section 261 along the third direction Z, and the third section 263 is disposed between the first section 261 and the second section 262. The tab 13 includes a first extension section 131 extending along the first direction X, and the first extension section 131 is disposed between the first section 261 and the second section 262 to improve the stability of the connection between the first connector 26 and the tab 13.

[0093] Along the third direction Z, the sum of the thicknesses of the first section 261 , the second section 262 and the first extension section 131 is H4, H3≤H4, so as to reduce the risk of the second protection device 27 protruding out of the first connecting member 26 and interfering with other structural members (such as the second protective member 50 ).

[0094] Except for the above differences, the parameters of the battery 100B and the battery 100A are substantially the same, and reference may be made to the description of the battery 100A above.

[0095] Example 3 See also Figure 8 An embodiment of the present application further provides a terminal device 200A, comprising the battery (100A, 100B) in any of the above embodiments.

[0096] Optionally, the terminal device 200A can be a mobile phone, a tablet computer, a laptop computer, a smart wearable product (e.g., a smart watch, a smart bracelet), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or other device with a rechargeable battery.

[0097] In summary, in the above-mentioned battery (100A, 100B) and terminal device 200A, each substrate 22 is arranged at the bending portion 121A of a battery cell 10, and the substrate 22 is located between the two convex corners 121B of the battery cell 10 along the second direction Y, so that the substrate 22 and the convex corner 121B 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, 100B), thereby facilitating the improvement of the energy density of the battery (100A, 100B). Along the third direction Z, the first connecting portion 211 is arranged on the side of the two adjacent convex corners 121B away from the top wall 111. Along the second direction Y, the two second connecting portions 212 are arranged at both ends of the first connecting portion 211, so that the first flexible circuit board 21 avoids the two adjacent convex corners 121B. The first protection device 24 is arranged on the second flexible circuit board 23 so that the first protection device 24 is far away from the top seal portion 121, so that the first protection device 24 can use the space of the accommodation cavity of the terminal device, thereby reducing the space occupied by the circuit board assembly 20 at the head of the battery (100A, 100B), which is beneficial to improving the energy density of the battery (100A, 100B). In addition, by arranging the first protection device 24 on the second flexible circuit board 23, the number of connection lines required on the first flexible circuit board 21 can be reduced, which is beneficial to the layout of the overcurrent circuit on the first flexible circuit board 21, thereby improving the overcurrent capacity of the first flexible circuit board 21.

[0098] Example 4 See also Fig. 9 One embodiment of the present application further provides a terminal device 200B, including a mainboard 70, a battery 100C and a first protection device 80. The difference between the battery 100C and the battery 100A is that the first protection device 24 of the battery 100A is moved outward from the second flexible circuit board 23.

[0099] The circuit board assembly 20 includes a first flexible circuit board 21, two substrates 22, a second flexible circuit board 23 and a first protective device 80. Each substrate 22 is arranged at a bending portion 121A of a battery cell 10, and the substrate 22 and the bending portion 121A are arranged opposite to each other along the third direction Z and are electrically connected to the corresponding tab 13 of the battery cell 10. The substrate 22 is located between the two convex corners 121B of the battery cell 10 along the second direction Y, so that the substrate 22 and the convex corner 121B share the space in the third direction Z, which can reduce the space occupied by the circuit board assembly 20 at the head of the battery 100A, thereby facilitating the improvement of the energy density of the battery 100A.

[0100] The first flexible circuit board 21 includes a first connection portion 211 and two second connection portions 212. Along the third direction Z, the first connection portion 211 is disposed on a side of two adjacent convex corner portions 121B away from the top wall 111. Along the second direction Y, the two second connection portions 212 are disposed at both ends of the first connection portion 211, and each second connection portion 212 is electrically connected to a substrate 22, so that the two substrates 22 are electrically connected through the first flexible circuit board 21, and the first flexible circuit board 21 avoids the two adjacent convex corner portions 121B.

[0101] The second flexible circuit board 23 extends from the first flexible circuit board 21 in a direction away from the top wall 111 . When viewed along the first direction X, the second flexible circuit board 23 is separated from the battery cell 10 . The second flexible circuit board 23 is configured to be electrically connected to an external circuit.

[0102] The first protection device 80 is disposed on the main board 70 and is configured to form a protection circuit with the circuit board assembly 20 to protect the battery cell 10, so as to reduce the space waste caused by disposing the protection circuit at the head of the battery 100C, which is beneficial to improve the energy density of the battery 100C. In addition, by disposing the first protection device 24 on the main board 70, the number of connection lines required on the first flexible circuit board 21 can be reduced, which is beneficial to the layout of the overcurrent circuit on the first flexible circuit board 21, and further beneficial to improve the overcurrent capacity of the first flexible circuit board 21.

[0103] In addition, those skilled in the art may also make other changes within the spirit of the present application. Of course, these changes made according to the spirit of the present application should be included in the scope disclosed in the present application.

Claims

1. A battery, characterized in that: The battery comprises: Two battery cells, the thickness direction of the two battery cells is a first direction, and when viewed along the first direction, the two battery cells are arranged along a second direction, the battery cell comprises a main body, a packaging portion, and a pole ear, the main body comprises a top wall, the packaging portion comprises a top sealing portion arranged on the top wall, the top sealing portion comprises a bending portion and convex corner portions arranged at both ends of the bending portion along the second direction, the bending portion is bent toward the top wall, the pole ear extends from the bending portion, and the convex corner portion extends along a third direction in a direction away from the top wall, and the first direction, the second direction, and the third direction are perpendicular to each other; A circuit board assembly, the circuit board assembly comprising a first flexible circuit board, two substrates, a second flexible circuit board and a first protective device, each of the substrates being arranged at the bending portion of one of the battery cells, the substrate and the bending portion being arranged opposite to each other along the third direction and electrically connected to the corresponding pole ear of the battery cell, the substrate being located between the two convex corners of the battery cell along the second direction, the first flexible circuit board comprising a first connecting portion and two second connecting portions, along the third direction, the first connecting portion being arranged at one side of two adjacent convex corners away from the top wall, along the second direction, two second connecting portions being arranged at both ends of the first connecting portion, and each of the second connecting portions being electrically connected to one of the substrates, the second flexible circuit board extending from the first flexible circuit board in a direction away from the top wall, and being separated from the battery cell when viewed along the first direction, the second flexible circuit board being configured to be electrically connected to an external circuit, and the first protective device being arranged on the second flexible circuit board.

2. The battery according to claim 1, characterized in that Along the first direction, the width of the first flexible circuit board is L1, the thickness of the battery cell is L2, L1≤L2, and 2mm≤L1≤6mm.

3. The battery according to claim 1, characterized in that The substrate includes a third flexible circuit board and a reinforcing plate stacked along the third direction, the second connecting portion is connected to the third flexible circuit board, and the first flexible circuit board is integrally arranged with the two third flexible circuit boards.

4. The battery according to claim 1, characterized in that The first protection device includes a first PCB board and a first electronic component; The second flexible circuit board includes a first part, a second part and a third part, the first part is connected to the substrate or the first flexible circuit board, the first part extends in a direction away from the top wall, the second part is connected to an end of the first part away from the top wall, the first PCB board is arranged on the second part, the first electronic component is arranged on a surface of the first PCB board away from the second part, and the third part is connected to the second part and is configured to be electrically connected to an external circuit.

5. The battery according to claim 4, characterized in that The circuit board assembly further includes an injection molding portion disposed on the second portion, the injection molding portion covers a surface of the first PCB board away from the second portion, and the first electronic component is located in the injection molding portion.

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

7. The battery according to claim 5 or 6, characterized in that The first protection device includes a second electronic component, which is arranged on a surface of the first PCB board away from the second part. Along the arrangement direction of the second part and the first PCB board, the height of the second electronic component is H1, and the distance between the surface of the injection molding part away from the first PCB board and the first PCB board is H2, H1≤H2, and a recess is provided on the surface of the injection molding part away from the first PCB board, and an end surface of the second electronic component away from the first PCB board is exposed from the recess.

8. The battery according to claim 6, characterized in that Observing along the arrangement direction of the second part and the first PCB board, the outer peripheral edge of the first PCB board is located inside the outer peripheral edge of the injection molding part, and the distance between the outer peripheral edge of the first PCB board and the outer peripheral edge of the injection molding part is W1, 0.2mm≤W1≤0.5mm.

9. The battery according to claim 1, characterized in that Along the third direction, there is a height difference L3 between the first connection portion and the substrate, the second connection portion extends from the first connection portion in a direction toward the top wall, and along the second direction, the second connection portion is arranged opposite to the two adjacent convex corner portions.

10. The battery according to claim 9, characterized in that The circuit board assembly includes a second protective device, which is disposed on a surface of the substrate away from the top wall. Along the third direction, a height of the second protective device is H3, where H3≤L3.

11. The battery according to claim 10, characterized in that The circuit board assembly includes two first connectors, which are arranged on the surface of the substrate away from the top wall and connected to the corresponding tabs of the battery cells. Along the second direction, the two first connectors are arranged at intervals, and the second protection device is located between the two first connectors.

12. The battery according to claim 11, characterized in that The first connecting member comprises a first section, a second section and a third section, the first section is arranged on a surface of the substrate away from the top wall, the second section is located on a side of the first section away from the substrate and is spaced apart from the first section along the third direction, the third section is arranged between the first section and the second section, the tab comprises a first extension section extending along the first direction, the first extension section is arranged between the first section and the second section; Along the third direction, the sum of the thicknesses of the first section, the second section and the first extension section is H4, and H3≤H4.

13. The battery according to claim 1, characterized in that The battery comprises: A first buffer member, the first buffer member includes a first buffer portion and two second buffer portions, the two second buffer portions are arranged at two ends of the first buffer portion along the second direction, the first buffer portion is arranged between the first flexible circuit board and two adjacent convex corner portions, and the second buffer portion is arranged between the substrate and the bending portion; A first protective member, the first protective member is disposed on a surface of the first buffer member close to the circuit board assembly; A second protective member is disposed on a side of the substrate away from the top wall.

14. A terminal device, characterized in that: The terminal device comprises the battery according to any one of claims 1 to 13.

15. A terminal device, characterized in that: The terminal device includes a mainboard, a battery and a first protection device, and the battery includes: Two battery cells, the thickness direction of the two battery cells is a first direction, and when viewed along the first direction, the two battery cells are arranged along a second direction, the battery cell comprises a main body, a packaging portion, and a pole ear, the main body comprises a top wall, the packaging portion comprises a top sealing portion arranged on the top wall, the top sealing portion comprises a bending portion and convex corner portions arranged at both ends of the bending portion along the second direction, the bending portion is bent toward the top wall, the pole ear extends from the bending portion, and the convex corner portion extends along a third direction in a direction away from the top wall, and the first direction, the second direction, and the third direction are perpendicular to each other; A circuit board assembly, the circuit board assembly comprising a first flexible circuit board, two substrates and a second flexible circuit board, each of the substrates being arranged at the bending portion of one of the battery cells, the substrate and the bending portion being arranged opposite to each other along the third direction and connected to the corresponding pole ear, the substrate being located between the two convex corners of the battery cell along the second direction, the first flexible circuit board comprising a first connecting portion and two second connecting portions, along the third direction, the first connecting portion being arranged at one side of two adjacent convex corners away from the top wall, along the second direction, two second connecting portions being arranged at both ends of the first connecting portion, and each of the second connecting portions being electrically connected to one of the substrates, the second flexible circuit board extending from the first flexible circuit board in a direction away from the top wall, and being separated from the battery cell when viewed along the first direction, the second flexible circuit board being configured to be electrically connected to the mainboard, the first protective device being arranged on the mainboard, and the first protective device being configured to form a protective circuit with the circuit board assembly to protect the battery cell.

Images