Battery and terminal device

Abstract

The invention discloses a battery and a terminal device. The battery comprises a battery cell, a circuit board assembly, an adapter tab and a protection plate, the battery cell comprises an electrode assembly and a packaging bag. The packaging bag comprises a main body part and a packaging part, and the electrode assembly is arranged in the main body part. The main body part comprises a top wall, a first concave wall and a first side wall, the first side wall and the top wall are arranged in a spaced mode in the second direction and the third direction when observed in the first direction, and the first concave wall is connected with the first side wall and the top wall. The packaging part comprises a top sealing part, a side sealing part and a corner sealing part, the top sealing part is connected with the top wall, the side sealing part is connected with the first side wall, and the corner sealing part is connected with the first concave wall, the side sealing part and the top sealing part to form a first containing space. The circuit board assembly comprises a substrate which is arranged on the top wall. One end of the switching tab is electrically connected with the electrode assembly, and the other end of the switching tab extends out of the corner sealing part and is electrically connected with the substrate. And the protection piece is connected with the top wall and the first concave wall, and the protection piece wraps the top sealing part, the corner sealing part, the switching tab and the substrate. The battery is favorable for improving the reliability.

Description

[0001] This application is a divisional application of application number 202411724412.X, filed on November 27, 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] In existing battery structures, a battery consists of a cell and a circuit board assembly. The battery head typically refers to the area where the circuit board assembly is located within the cell. When a battery undergoes drop tests or is subjected to mechanical abuse (such as impacts, compression, or drops), the circuit board assembly at the battery head is easily damaged and fails under the impact of external forces, reducing the battery's reliability. Summary of the Invention

[0004] In view of the above situation, this application provides a battery that is beneficial to improving reliability.

[0005] This application provides a battery comprising a battery cell, a circuit board assembly, an adapter tab, and a protection board. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a sealing portion. The electrode assembly is disposed within the main body. The main body includes a top wall, a first concave wall, and a first side wall. Viewed along a first direction, the first side wall and the top wall are spaced apart along a second and a third direction. The first concave wall connects the first side wall and the top wall. The first direction is the thickness direction of the battery cell, and the first, second, and third directions are perpendicular to each other. The sealing portion includes a top seal, a side seal, and a corner seal. The top seal connects to the top wall, the side seal connects to the first side wall, and the corner seal connects the first concave wall, the side seal, and the top seal. The corner seal, the first concave wall, the side seal, and the top seal form a first accommodating space. The circuit board assembly includes a substrate disposed on the top wall. One end of the adapter tab is electrically connected to the electrode assembly, and the other end of the adapter tab extends from the corner seal and is electrically connected to the substrate. The protective member connects the top wall and the first recessed wall, and covers the top seal, corner seal, adapter tab and substrate, with part of the protective member located in the first accommodating space.

[0006] In the aforementioned battery, the protective component connects the top wall and the first concave wall. The first concave wall increases the connection area of ​​the protective component at the corner of the cell, thereby improving the connection stability between the protective component and the cell. The protective component covers the adapter tabs to reduce the risk of adapter tab breakage even when the adapter tabs are narrow, and also improves the connection strength between the adapter tabs and the substrate. The protective component also covers the top seal, corner seals, and substrate, strengthening the connection strength between the components. This reduces the risk of damage to the top seal, corner seals, adapter tabs, and substrate during drop tests or mechanical abuse, thus improving battery reliability.

[0007] In some embodiments of this application, the width of the adapter tab along the second direction is L1, where 2mm≤L1≤4mm, in order to reduce the risk of insufficient overcurrent capacity of the adapter tab and to reduce the space occupied by the adapter tab on the battery head.

[0008] In some embodiments of this application, the protective member includes a cover and a protrusion. The cover includes a first sub-cover and a second sub-cover, which are connected along a second direction. Along a third direction, the first sub-cover overlaps with a top wall, and the second sub-cover overlaps with a first recessed wall. The protrusion is connected to the surface of the second sub-cover near the first recessed wall, and at least a portion of the protrusion is located in a first accommodating space to facilitate connection with the first recessed wall.

[0009] In some embodiments of this application, the circuit board assembly includes a flexible circuit board, which is connected to a substrate. A protective member covers the portion where the flexible circuit board is connected to the substrate to improve the stability of the connection between the flexible circuit board and the substrate. A recess is provided at the corner of the second sub-cover portion away from the first sub-cover portion, and the flexible circuit board extends from the recess to expand the range of motion of the flexible circuit board.

[0010] In some embodiments of this application, the main body includes two first sidewalls and two first recessed walls, the two first sidewalls being disposed opposite each other along a second direction, and the two first recessed walls being connected to both ends of the top wall. The encapsulation portion includes two side seals and two corner seals, each side seal being connected to a first sidewall, and each corner seal being connected to a first recessed wall, a side seal, and a top seal. The battery includes two adapter tabs, each adapter tab extending from a corner seal. A protective member connects the top wall and the two first recessed walls, and the protective member covers the top seal, the two corner seals, the two adapter tabs, and the substrate.

[0011] In some embodiments of this application, the main body includes a bottom wall, and a top wall and a bottom wall are disposed opposite each other along a third direction. The first recessed wall includes a first wall and a second wall. Viewed along a first direction, the first wall connects to the top wall and extends toward the bottom wall, and the second wall connects to the end of the first wall away from the top wall and extends toward the corresponding first side wall. The first wall and the second wall are respectively connected to a protective member.

[0012] In some embodiments of this application, the top seal is bent toward the top wall. The top seal includes a top seal body and a top seal extension. Along a third direction, the top seal body overlaps with the top wall, the top seal extension overlaps with a second wall, the top seal body is connected to the top wall, and the top seal extension is connected to the corner seal.

[0013] In some embodiments of this application, the adapter tab includes a first extension and a second extension. The first extension extends out of the corner seal in a third direction, and the second extension connects to the first extension and is spaced apart from the top seal extension in a second direction. The circuit board assembly includes a first connector connected to the surface of the substrate near the second wall. The second extension connects to the first connector to shorten the connection path between the adapter tab and the substrate. A protective member covers the first connector to improve the structural stability of the first connector at the battery head.

[0014] In some embodiments of this application, the first connector includes a first segment, a second segment, and a third segment. The first segment includes a first region and a second region. Along a third direction, the first region overlaps with the substrate, the second region overlaps with a second wall, the second segment is disposed on the side of the second region near the second wall, and the third segment connects the second region and the second segment. A second extension segment is disposed between the second region and the second segment to improve the stability of the connection between the adapter tab and the first connector. The battery includes a first insulating member, which includes a first insulating portion, a second insulating portion, and a third insulating portion connected in sequence. Along a third direction, the first insulating portion is located between the second segment and the second wall, the second insulating portion is located between the first region and the top sealing portion, and the third insulating portion is located between the substrate and the top sealing portion. The first insulating portion is used to improve the insulation stability between the first connector and the first recessed wall, and can reduce the risk of short circuit caused by the injection molding equipment contacting the first connector, thereby improving the reliability of the battery. The second insulating portion is used to improve the insulation stability between the first connector and the top sealing portion. The third insulating portion is used to improve the insulation stability between the substrate and the top sealing portion.

[0015] In some embodiments of this application, the battery includes a second insulating member that covers the corner seal and the side seal extending out of the second wall in a third direction, thereby reducing the risk of damage to the corner seal or side seal by the injection molding equipment and improving the reliability of the battery.

[0016] In some embodiments of this application, the first connector includes a fourth segment, a fifth segment, and a sixth segment. Along a third direction, the fourth segment overlaps with the substrate, the fifth segment overlaps with the second wall, and the sixth segment connects between the fourth and fifth segments, and along a second direction, the sixth segment overlaps with the first wall. The second extension includes a first sub-extension and a second sub-extension connected sequentially. The first sub-extension connects to the first extension and overlaps with the corner seal along a first direction. The second sub-extension overlaps with the fifth segment along a third direction. Along a third direction, the distance between the second sub-extension and the substrate is H1, 0.2mm ≤ H1 ≤ 2mm, and the distance between the fifth segment and the substrate is H2, 0.2mm ≤ H2 ≤ 2mm. The first accommodating space accommodates the fifth segment, the sixth segment, and the second extension, thereby reducing the space occupied by the first connector and the adapter tab at the corner of the cell along a third direction. Furthermore, when the injection molding equipment is positioned at the corner of the cell to perform injection molding on the battery head, it helps reduce the risk of short circuits caused by the injection molding equipment contacting the first connector or the adapter tab, thus improving battery reliability.

[0017] In some embodiments of this application, the first connector includes a seventh segment, an eighth segment, and a ninth segment. Along a third direction, the seventh segment overlaps with the substrate, the eighth segment is disposed on the side of the seventh segment facing the second wall, and the ninth segment connects the seventh and eighth segments. The second extension includes an overlapping segment disposed between the seventh and eighth segments to improve the stability of the connection between the adapter tab and the first connector. Furthermore, viewed along a third direction, the seventh segment, the eighth segment, and the overlapping segment are all located within the substrate, thereby reducing the risk of short circuits caused by the injection molding equipment contacting the first connector or the adapter tab under the shielding effect of the substrate, and improving battery reliability.

[0018] In some embodiments of this application, the first concave wall includes a third wall. Viewed along a first direction, the third wall is inclined relative to the top wall and the first side wall, and the angle between the third wall and the top wall is α, where 110°≤α≤150°. The corner seal includes a first side parallel to the third wall, and the adapter tab extends from the first side. The top seal bends toward the top wall and includes a top seal body and a top seal extension. Along a third direction, the top seal body overlaps with the top wall, the top seal extension overlaps with the third wall, the top seal body connects to the top wall, and the top seal extension connects to the corner seal and is located on one side of the first side along a second direction. The circuit board assembly includes a second connector connected to the side of the substrate facing the third wall, and the adapter tab connects to the second connector to shorten the connection path between the adapter tab and the substrate. A protective member covers the second connector to improve the structural stability of the second connector at the battery head.

[0019] In some embodiments of this application, the adapter tab extends from the first side in a direction perpendicular to the third wall. The second connector includes a first part, a second part, and a third part. The first part overlaps with the substrate in a third direction, the portion of the adapter tab extending from the first side overlaps with the second part in a first direction, and the third part connects between the first part and the second part. The first accommodating space accommodates the second part and the adapter tab, thereby reducing the space occupied by the second connector and the adapter tab in the corner of the cell in a third direction. When the injection molding equipment is positioned at the corner of the cell to perform injection molding on the battery head, this helps to reduce the risk of short circuit caused by the injection molding equipment contacting the second connector or the adapter tab, thus improving the reliability of the battery.

[0020] In some embodiments of this application, the adapter tab includes a third extension and a fourth extension. The third extension extends from a first side along a third direction, and the fourth extension is bent and connected to the third extension and spaced apart from the top sealing extension along a second direction. The second connector includes a fourth part, a fifth part, and a sixth part. The fourth part includes a third region and a fourth region. Along a third direction, the third region overlaps with the substrate, and the fourth region overlaps with the third wall. The fifth part is disposed on the side of the fourth region facing the third wall, and the sixth part connects the fourth region and the fifth part. The fourth extension is disposed between the fourth region and the fifth part to improve the stability of the connection between the adapter tab and the second connector.

[0021] In some embodiments of this application, the battery includes a third insulating member, which includes a first insulating region and a second insulating region. Along a first direction, the first insulating region covers at least one side of the overlapping portion of the adapter tab and the second connector, and the second insulating region covers the portion of the second connector located outside the substrate, so as to reduce the risk of short circuit caused by the injection molding equipment contacting the second connector or the adapter tab, and improve the reliability of the battery.

[0022] In some embodiments of this application, the side seal is bent toward the first sidewall. The side seal includes a side seal body and a side seal extension. Along a second direction, the side seal body overlaps with the first sidewall, and the side seal extension overlaps with the first concave wall. The side seal body is connected to the first sidewall, and the side seal extension is connected to the corner seal. A protective member covers the side seal extension to improve the structural strength of the battery head.

[0023] In some embodiments of this application, the electrode assembly includes an electrode group and an inner tab. A first concave surface is provided at the corner of the electrode group adjacent to the first concave wall, and the inner tab extends from the first concave surface. The inner tab connects to an adapter tab to form a joint, which is located between the first concave surface and the first concave wall, so that the joint and the electrode group share a third-direction upward space, thereby improving the energy density of the battery.

[0024] Embodiments of this application also provide a battery, which includes a battery cell, a circuit board assembly, an adapter tab, and a protection board. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a sealing part. The electrode assembly is disposed within the main body. The main body includes a top wall, a first concave wall, and a first side wall. Viewed along a first direction, the first side wall and the top wall are spaced apart along a second direction and a third direction. The first concave wall connects the first side wall and the top wall. The first direction is the thickness direction of the battery cell, and the first direction, the second direction, and the third direction are perpendicular to each other. The sealing part includes a top seal, a side seal, and a corner seal. The top seal is connected to the top wall, the side seal is connected to the first side wall, and the corner seal connects the first concave wall, the side seal, and the top seal, forming a first accommodating space. The side seal and the top seal are spaced apart. The circuit board assembly includes a substrate, which is disposed on the top wall. One end of the adapter tab is electrically connected to the electrode assembly, and the other end of the adapter tab extends from the top seal and is electrically connected to the substrate. The protective component connects the top wall and the first recessed wall, and covers the top seal, corner seal, adapter tab, and substrate.

[0025] In the aforementioned battery, the protective component connects the top wall and the first concave wall. The first concave wall increases the connection area of ​​the protective component at the corner of the cell, thereby improving the connection stability between the protective component and the cell. The protective component covers the top seal, corner seal, adapter tab, and substrate. The protective component enhances the structural strength of the battery head, reducing the risk of damage to the top seal, corner seal, adapter tab, and substrate during drop tests or mechanical abuse, thus improving battery reliability. The adapter tab extends from the top seal and is electrically connected to the substrate, moving away from the corner of the cell along a second direction. This helps reduce the risk of short circuits caused by the injection molding equipment contacting the adapter tab.

[0026] In some embodiments of this application, a terminal device is also provided, which uses any of the batteries described in the above embodiments. Attached Figure Description

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

[0028] Figure 2 This is a schematic diagram of the structure of the battery head in one embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the disassembled structure of a battery cell in one embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the second separator of the battery in one embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the electrode assembly of the battery in one embodiment of this application.

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

[0033] Figure 7 This is a schematic diagram of the structure of the battery head in one embodiment of this application.

[0034] Figure 8 This is a schematic diagram of the disassembled structure of a battery cell in one embodiment of this application.

[0035] Figure 9 This is a schematic diagram of the structure of the third separator of the battery in one embodiment of this application.

[0036] Figure 10 This is a schematic diagram of the battery structure in one embodiment of this application.

[0037] Figure 11 This is a schematic diagram of the structure of the battery head in one embodiment of this application.

[0038] Figure 12 This is a schematic diagram of the disassembled structure of a battery cell in one embodiment of this application.

[0039] Figure 13 This is a schematic diagram of the battery structure in one embodiment of this application.

[0040] Figure 14 This is a schematic diagram of the structure of the battery head in one embodiment of this application.

[0041] Figure 15 This is a schematic diagram of the disassembled structure of a battery cell in one embodiment of this application.

[0042] Figure 16 This is a schematic diagram of the structure of the third insulating element of the battery in one embodiment of this application.

[0043] Figure 17 This is a schematic diagram of the electrode assembly of the battery in one embodiment of this application.

[0044] Figure 18 This is a schematic diagram of the structure of the battery head in one embodiment of this application.

[0045] Figure 19 This is a schematic diagram of the disassembled structure of a battery cell in one embodiment of this application.

[0046] Figure 20 This is a schematic diagram of the battery structure in one embodiment of this application.

[0047] Figure 21 This is a schematic diagram of the structure of the battery head in one embodiment of this application.

[0048] Figure 22 This is a schematic diagram of the disassembled structure of a battery cell in one embodiment of this application.

[0049] Figure 23 This is a schematic diagram of the terminal device in another embodiment of this application.

[0050] Explanation of main component symbols Batteries 100A, 100B, 100C, 100D, 100E, 100F Terminal device 200 Battery Cell 10 Electrode assembly 11 Electrode Group 111 First concave surface 111A Page 111A1 Second page 111A2 Inner ear 112 Joint 112A Packaging bag 12 Main body 13 Top Wall 131 First concave wall 132 First Wall 132A Second wall 132B Third Wall 132C First side wall 133 Bottom wall 134 Second sidewall 135 Packaging section 14 First storage space 14A Gap 14B Top sealing section 141 Top seal body part 141A Top sealing extension 141B Second side 141B1 Side sealing part 142 Side seal body part 142A Side sealing extension 142B Third side 142B1 Corner seal 143 First side 143A Circuit board assembly 20 Substrate 21 Flexible circuit board 22 First connecting segment 221 Second connecting section 222 Third connecting section 223 Fourth connecting segment 224 Connector 225 First connector 23 First paragraph 231 Area 1, 231A Area 231B Second paragraph, 232 Third paragraph 233 Paragraph 4, page 234 Paragraph 5, 235 Paragraph 6, 236 Paragraph 7, 237 Section 8, 238 Ninth paragraph 239 Second connector 24 Part 1, Chapter 241 Part 2, Chapter 242 Part 3, Chapter 243 Part 4, Chapter 244 Area 3, 244A Area 4, 244B Part 5, Chapter 245 Part 6, Chapter 246 Adapter 30 First extension section 31 Second extension section 32 First sub-extension 321 Second sub-extension 322 Overlapping segment 32A Third extension section 33 Fourth extension paragraph 34 Protective component 40 Cover 41 First sub-cover part 411 Second sub-cover 412 Recessed portion 412A Projection 42 First insulating component 51 First insulating part 511 Second insulating part 512 Third Insulation Section 513 Fourth Insulation Part 514 Fifth Insulation Section 515 Sixth Insulation Section 516 Seventh Insulation Section 517 Eighth Insulation Section 518 Second insulating component 52 Third insulating component 53 First Insulation Zone 531 Second Insulation Zone 532 First isolation component 61 First Isolation Department 611 Second Isolation Section 612 Second isolation component 62 Third Isolation Department 621 Fourth Isolation Department 622 Fifth Isolation Department 623 Third isolation component 63 Sixth Isolation Department 631 Seventh Isolation Department 632 First direction X Second direction Y The third direction, Z.

[0051] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0052] 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.

[0053] 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%.

[0054] 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.

[0055] 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.

[0056] One embodiment of this application provides a battery, which includes a battery cell, a circuit board assembly, an adapter tab, and a protection board. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a sealing part. The electrode assembly is disposed within the main body. The main body includes a top wall, a first concave wall, and a first side wall. Viewed along a first direction, the first side wall and the top wall are spaced apart along a second direction and a third direction. The first concave wall connects the first side wall and the top wall. The first direction is the thickness direction of the battery cell, and the first direction, the second direction, and the third direction are perpendicular to each other. The sealing part includes a top seal, a side seal, and a corner seal. The top seal is connected to the top wall, the side seal is connected to the first side wall, and the corner seal is connected to the first concave wall, the side seal, and the top seal. The corner seal, the first concave wall, the side seal, and the top seal form a first accommodating space. The circuit board assembly includes a substrate, which is disposed on the top wall. One end of the adapter tab is electrically connected to the electrode assembly, and the other end of the adapter tab extends from the corner seal and is electrically connected to the substrate. The protective member connects the top wall and the first recessed wall, and covers the top seal, corner seal, adapter tab and substrate, with part of the protective member located in the first accommodating space.

[0057] In the aforementioned battery, the protective component connects the top wall and the first concave wall. The first concave wall increases the connection area of ​​the protective component at the corner of the cell, thereby improving the connection stability between the protective component and the cell. The protective component covers the adapter tab to reduce the risk of adapter tab breakage even when the adapter tab is narrow, and also improves the connection strength between the adapter tab and the substrate. The protective component also covers the top seal, corner seal, and substrate, strengthening the connection strength between the components. This reduces the risk of damage to the top seal, corner seal, adapter tab, and substrate during drop tests or mechanical abuse, thus improving battery reliability.

[0058] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0059] Example 1 Please refer to the following: Figure 1 , Figure 2 and Figure 5One embodiment of this application provides a battery 100A, which includes a cell 10, a circuit board assembly 20, an adapter tab 30, and a protective component 40. 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.

[0060] The battery cell 10 includes an electrode assembly 11 and a packaging bag 12. The electrode assembly 11 is used to convert chemical energy into electrical energy. The packaging bag 12 is made of a sealing film by perforation, folding, and heat sealing. The packaging bag 12 includes a main body 13 and a sealing part 14. The main body 13 is the part of the packaging bag 12 with perforations, and the sealing part 14 is the part where the sealing film overlaps and joins. The electrode assembly 11 is disposed within the main body 13. The main body 13 includes a top wall 131, a first concave wall 132, and a first side wall 133. Viewed along the first direction X, the first side wall 133 and the top wall 131 are spaced apart along the second direction Y and the third direction Z. The first concave wall 132 connects the first side wall 133 and the top wall 131.

[0061] Wherein, the first direction X is the thickness direction of the battery cell 10, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Optionally, 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.

[0062] Please refer to the following: Figure 2 and Figure 3 The encapsulation part 14 includes a top sealing part 141, a side sealing part 142, and a corner sealing part 143. The top sealing part 141 is connected to the top wall 131, the side sealing part 142 is connected to the first side wall 133, and the corner sealing part 143 is connected to the first concave wall 132, the side sealing part 142, and the top sealing part 141. The corner sealing part 143, the first concave wall 132, the side sealing part 142, and the top sealing part 141 form a first accommodating space 14A. The corner sealing part 143 is used to seal the first concave wall 132.

[0063] The circuit board assembly 20 includes a substrate 21 disposed on the top wall 131. The substrate 21 is used to construct a protection circuit, which may provide, but is not limited to, protection against overcharging, over-discharging, overcurrent, short circuit, and anti-counterfeiting for the battery cell 10.

[0064] One end of the adapter tab 30 is electrically connected to the electrode assembly 11, and the other end of the adapter tab 30 extends from the corner seal 143 and is electrically connected to the substrate 21.

[0065] The protective member 40 connects the top wall 131 and the first recessed wall 132. The first recessed wall 132 increases the connection area of ​​the protective member 40 at the corner of the cell 10, thereby improving the connection stability between the protective member 40 and the cell 10. The protective member 40 is used to improve the structural strength of the head of the battery 100A. Specifically, the protective member 40 covers the top seal 141, the corner seal 143, the adapter tab 30, and the substrate 21, and a portion of the protective member 40 is located in the first accommodating space 14A. The protective member 40 covers the adapter tab 30 so that even when the width of the adapter tab 30 is small, the risk of breakage of the adapter tab 30 can be reduced, and the connection strength between the adapter tab 30 and the substrate 21 can also be improved. The protective component 40 also covers the top seal 141, the corner seal 143, and the substrate 21. When the battery 100A is subjected to drop tests or mechanical abuse, it can reduce the risk of damage to the top seal 141, the corner seal 143, the adapter tab 30, and the substrate 21, thereby improving the reliability of the battery 100A.

[0066] In some embodiments, the protective member 40 is formed on the top wall 131 and the first concave wall 132 by melting and solidifying the injection molding material using an injection molding machine.

[0067] Optionally, the injection molding material includes at least one of polyamide, silicone resin and rubber.

[0068] Please continue reading. Figure 3 In some embodiments, the width of the adapter tab 30 along the second direction Y is L1, where 2mm ≤ L1 ≤ 4mm. When L1 is too small, the current-carrying capacity of the adapter tab 30 will be weak. When L1 is too large, the length of the corner seal 143 in the second direction Y will increase, resulting in a larger space occupied by the first concave wall 132 in the second direction Y. By limiting L1 to 4mm, the risk of insufficient current-carrying capacity of the adapter tab 30 can be reduced, and the space occupied by the adapter tab 30 in the head of the battery 100A can be reduced.

[0069] Optionally, L1 can be any value within the range of 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or any other value satisfying 2mm≤L1≤4mm.

[0070] Please continue reading. Figure 2 and Figure 3In some embodiments, the protective member 40 includes a cover portion 41 and a protrusion 42. The cover portion 41 includes a first sub-cover portion 411 and a second sub-cover portion 412, which are connected along a second direction Y. Along a third direction Z, the first sub-cover portion 411 overlaps with the top wall 131, and the second sub-cover portion 412 overlaps with the first recessed wall 132. The protrusion 42 is connected to the surface of the second sub-cover portion 412 near the first recessed wall 132 and is at least partially located in the first accommodating space 14A to facilitate connection with the first recessed wall 132. The cover portion 41 covers the substrate 21 and the top sealing portion 141, the protrusion 42 covers the corner sealing portion 143, and the protrusion 42 and the second sub-cover portion 412 cover the adapter tab 30.

[0071] In some embodiments, the protrusion 42 and the second sub-cover 412 also cover the portion where the top seal 141 connects to the corner seal 143, and the portion where the side seal 142 connects to the corner seal 143, to further improve the structural strength of the battery 100A head.

[0072] Please refer to it again. Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 includes a flexible circuit board 22 connected to a substrate 21, and the flexible circuit board 22 is configured to be electrically connected to an external circuit. A protective member 40 covers the portion where the flexible circuit board 22 connects to the substrate 21 to improve the stability of the connection between the flexible circuit board 22 and the substrate 21. A recess 412A is provided at a corner of the second sub-cover portion 412 away from the first sub-cover portion 411, and the flexible circuit board 22 extends from the recess 412A to expand the range of motion of the flexible circuit board 22.

[0073] In some embodiments, the flexible circuit board 22 includes a first connecting segment 221, a second connecting segment 222, a third connecting segment 223, a fourth connecting segment 224, and a connector 225. One end of the first connecting segment 221 is connected to the surface of the substrate 21 away from the top wall 131 and is located in the protective member 40, while the other end of the first connecting segment 221 extends from the recess 412A. The third connecting segment 223 is located outside the protective member 40 and is disposed opposite to the first connecting segment 221 in a third direction Z. The second connecting segment 222 is located outside the protective member 40 and is bent to connect with the first connecting segment 221 and the third connecting segment 223. The fourth connecting segment 224 extends from the third connecting segment 223 in a direction away from the substrate 21. The connector 225 is disposed on the fourth connecting segment 224 and is used for electrical connection with an external circuit.

[0074] Please continue reading. Figure 1 and Figure 2In some embodiments, the main body 13 includes two first sidewalls 133 and two first recessed walls 132. Along the second direction Y, the two first sidewalls 133 are disposed opposite each other, and the two first recessed walls 132 are connected to both ends of the top wall 131. The encapsulation part 14 includes two side seals 142 and two corner seals 143. Each side seal 142 is connected to a first sidewall 133, and each corner seal 143 is connected to a first recessed wall 132, a side seal 142, and a top seal 141. The battery 100A includes two adapter tabs 30 with opposite polarities, and each adapter tab 30 extends from a corner seal 143. Along the second direction Y, two first concave walls 132 form two first accommodating spaces 14A at both ends of the top wall 131. The protective member 40 connects the top wall 131 and the two first concave walls 132. The two first concave walls 132 can increase the connection area of ​​the protective member 40 at the two corners of the cell 10, thereby further improving the connection stability between the protective member 40 and the cell 10. The protective member 40 covers the top seal 141, the two corner seals 143, the two adapter tabs 30, and the substrate 21.

[0075] In some embodiments, the main body 13 includes a bottom wall 134 and two second side walls 135. The bottom wall 134 and the top wall 131 are disposed opposite each other along a third direction Z, and the two second side walls 135 are disposed opposite each other along a first direction X. The top wall 131, the bottom wall 134, the two first side walls 133 and the two first recessed walls 132 are connected between the two second side walls 135 and enclose a space for accommodating the electrode assembly 11.

[0076] In some embodiments, the circuit board assembly 20 includes a plurality of flexible circuit boards 22 to improve the current carrying capacity of the circuit board assembly 20. Optionally, the number of flexible circuit boards 22 is two, and the two flexible circuit boards 22 are connected to both ends of the substrate 21 along the second direction Y.

[0077] Please refer to it again. Figure 3 In some embodiments, the first recessed wall 132 includes a first wall 132A and a second wall 132B. Viewed along the first direction X, the first wall 132A connects to the top wall 131 and extends toward the bottom wall 134, and the second wall 132B connects to the end of the first wall 132A away from the top wall 131 and extends toward the corresponding first side wall 133. The first wall 132A and the second wall 132B are respectively connected to the protective member 40.

[0078] Optionally, the first wall 132A extends along the third direction Z, and the second wall 132B extends along the second direction Y.

[0079] In some embodiments, the connection between the first wall 132A and the second wall 132B is provided with a chamfer extending in an arc shape to reduce the risk of stress concentration at the connection between the first wall 132A and the second wall 132B.

[0080] Please continue reading. Figure 3 In some embodiments, the substrate 21 and the top wall 131 are disposed opposite each other along the third direction Z, and the top sealing portion 141 is located between the substrate 21 and the top wall 131.

[0081] The top seal portion 141 bends towards the top wall 131 to reduce the space occupied by the top seal portion 141 in the third direction Z, which is beneficial to improving the energy density of the battery 100A. The top seal portion 141 includes a top seal body portion 141A and a top seal extension portion 141B. Along the third direction Z, the top seal body portion 141A overlaps with the top wall 131, and the top seal extension portion 141B overlaps with the second wall 132B. The top seal body portion 141A is connected to the top wall 131, and the top seal extension portion 141B is connected to the corner seal portion 143 to improve the encapsulation stability of the package portion 14.

[0082] In some embodiments, the side seal portion 142 is bent toward the first sidewall 133 to reduce the space occupied by the side seal portion 142 in the second direction Y, which is beneficial to improving the energy density of the battery 100A. The side seal portion 142 includes a side seal body portion 142A and a side seal extension portion 142B. Along the second direction Y, the side seal body portion 142A overlaps with the first sidewall 133, and the side seal extension portion 142B overlaps with the first wall 132A. The side seal body portion 142A is connected to the first sidewall 213, and the side seal extension portion 142B is connected to the corner seal portion 143 to improve the encapsulation stability of the encapsulation portion 14.

[0083] In some embodiments, the protective member 40 covers the side sealing extension 142B to improve the structural strength of the battery 100A head.

[0084] Viewed along the third direction Z, the top sealing extension 141B and the side sealing extension 142B are spaced apart along the second direction Y and form a notch 14B connecting the first accommodating space 14A. The corner sealing portion 143, where the adapter tab 30 is provided, is located in the notch 14B to facilitate the connection of the adapter tab 30 to the substrate 21. Furthermore, when the injection molding equipment is positioned at the corner of the cell 10 to perform injection molding on the head of the battery 100A, the notch 14B facilitates the flow of injection molding material on the surfaces of the first accommodating space 14A and the top wall 131, thereby improving injection molding efficiency and enhancing the injection molding effect.

[0085] Please continue reading. Figure 3 In some embodiments, the adapter tab 30 includes a first extension 31 and a second extension 32. The first extension 31 extends out of the corner seal 143 along the third direction Z, and the second extension 32 connects to the first extension 31 and is spaced apart from the top seal extension 141B along the second direction Y.

[0086] In some embodiments, the corner seal 143 includes a first side 143A extending away from the second wall 132B along a third direction Z, and a first extension 31 extending from the first side 143A along a third direction Z. The top seal extension 141B includes a second side 141B1 connected to the first side 143A. The side seal extension 142B includes a third side 142B1 connected to the first side 143A. Viewed along the third direction Z, the second extension 32 is located between the second side 141B1 and the third side 142B1 along a second direction Y.

[0087] The protective component 40 covers the first side 143A, the second side 141B1, and the third side 142B1. The first side 143A, the second side 141B1, and the third side 142B1 are the cut surfaces of the encapsulation film. These cut surfaces contain exposed metal layers, which are prone to contact with other structural components, potentially causing a short circuit. By covering the first side 143A, the second side 141B1, and the third side 142B1 with the protective component 40, the exposed metal layers in the cut surfaces are insulated from other structural components, reducing the risk of short circuits and thus improving the reliability of the battery 100A.

[0088] Please refer to the following: Figure 2 and Figure 3 The circuit board assembly 20 includes a first connector 23 connected to the surface of the substrate 21 facing the second wall 132B. A second extension 32 connects to the first connector 23 to shorten the connection path between the adapter tab 30 and the substrate 21. A protective member 40 covers the first connector 23 to improve the connection stability between the first connector 23, the substrate 21, and the second extension 32.

[0089] In some embodiments, the first accommodating space 14A accommodates at least a portion of the first connector 23 to reduce the space occupied by the first connector 23 in the third direction Z at the corner of the cell 10. Furthermore, when the injection molding equipment is positioned at the corner of the cell 10 to perform injection molding on the head of the battery 100A, it helps to reduce the risk of short circuit caused by the injection molding equipment contacting the first connector 23, thereby improving the reliability of the battery 100A.

[0090] In some embodiments, the first accommodating space 14A accommodates at least a portion of the adapter tab 30 to reduce the space occupied by the adapter tab 30 in the third direction Z at the corner of the cell 10. Furthermore, when the injection molding equipment is positioned at the corner of the cell 10 to perform injection molding on the head of the battery 100A, it helps to reduce the risk of short circuit caused by the injection molding equipment contacting the adapter tab 30, thereby improving the reliability of the battery 100A.

[0091] Please continue reading. Figure 3In some embodiments, the first connector 23 includes a first segment 231, a second segment 232, and a third segment 233. The first segment 231 includes a first region 231A and a second region 231B. Along the third direction Z, the first region 231A overlaps with the substrate 21, the second region 231B overlaps with the second wall 132B, the second segment 232 is disposed on the side of the second region 231B facing the second wall 132B, and the third segment 233 connects the second region 231B and the second segment 232. A second extension segment 32 is disposed between the second region 231B and the second segment 232 to improve the stability of the connection between the adapter tab 30 and the first connector 23. Optionally, the second segment 232 is located in the first accommodating space 14A.

[0092] Please continue reading. Figure 3 In some embodiments, the battery 100A includes a first insulating member 51. The first insulating member 51 includes a first insulating portion 511, a second insulating portion 512, and a third insulating portion 513 connected in sequence. Along the third direction Z, the first insulating portion 511 is located between the second segment 232 and the second wall 132B; the second insulating portion 512 is located between the first region 231A and the top sealing portion 141; and the third insulating portion 513 is located between the substrate 21 and the top sealing portion 141. The first insulating portion 511 improves the insulation stability between the first connector 23 and the first recessed wall 132, and reduces the risk of short circuits caused by the injection molding equipment contacting the first connector 23, thereby improving the reliability of the battery 100A. The second insulating portion 512 improves the insulation stability between the first connector 23 and the top sealing portion 141. The third insulating portion 513 improves the insulation stability between the substrate 21 and the top sealing portion 141.

[0093] Optionally, the first insulating element 51 is DuPont adhesive tape.

[0094] Please continue reading. Figure 3 In some embodiments, the battery 100A includes a second insulating member 52, which covers the corner seal portion 143 and the side seal portion 142 extending out of the second wall 132B in a third direction Z (i.e., the side seal extension portion 142B) to reduce the risk of the injection molding equipment damaging the corner seal portion 143 or the side seal portion 142 and improve the reliability of the battery 100A.

[0095] Optionally, the second insulating element 52 is a Mylar membrane.

[0096] Please continue reading. Figure 3In some embodiments, the battery 100A includes a first separator 61, which includes a first separator portion 611 and a second separator portion 612 connected in sequence. The first separator portion 611 overlaps with the first wall 132A along the second direction Y to reduce the risk of damage to the first wall 132A by the injection molding equipment and improve the reliability of the battery 100A. The second separator portion 612 covers the top seal portion 141 and the non-overlapping area between the top wall 131 and the top seal portion 141 to improve the structural stability of the top seal portion 141 at the head of the battery 100A.

[0097] Optionally, the first separator 61 is a Mylar membrane.

[0098] Please refer to the following: Figure 3 and Figure 4 Battery 100B includes a second isolator 62, which includes a third isolator 621, a fourth isolator 622, and a fifth isolator 623 connected in sequence. The third isolator 621 covers the surface of the second region 231B away from the second segment 232, the fourth isolator 622 covers the surface of the third segment 233 away from the second extension segment 32, and the fifth isolator 623 covers the surface of the first insulating portion 511 away from the second segment 232. The second isolator 62 can reduce the risk of short circuit caused by the injection molding equipment contacting the first connector 23, and the second isolator 62 can also limit the positional relationship between the first insulating portion 511 and the first connector 23, reducing the risk of the first insulating portion 511 deviating from the first connector 23, thereby improving the reliability of battery 100A.

[0099] Optionally, the second spacer 62 is a Mylar membrane.

[0100] Please see Figure 5 , Figure 5 The top seal 141 and side seal 142 are in an unfolded, folded state. In some embodiments, the electrode assembly 11 includes an electrode group 111 and an inner tab 112. The electrode group 111 includes a positive electrode, a separator, and a negative electrode arranged in sequence. Optionally, the positive electrode, separator, and negative electrode are stacked. A first concave surface 111A is provided at the corner adjacent to the first concave wall 132 of the electrode group 111, and the inner tab 112 extends from the first concave surface 111A. The inner tab 112 is connected to the adapter tab 30 (i.e., the first extension 31) and forms a joint 112A, so that the adapter tab 30 is electrically connected to the electrode assembly 11. The joint 112A is located between the first concave surface 111A and the first concave wall 132, so that the joint 112A and the electrode group 111 share the space in the third direction Z, which is beneficial to improving the energy density of the battery 100A.

[0101] In some embodiments, the first concave wall 132, the first concave surface 111A, the first sidewall 133, and the second sidewall 135 together enclose a space for accommodating the joint portion 112A. Along the first direction X, the portion where the second sidewall 135 overlaps with the joint portion 112A is a suspended sidewall, and the portion where the second sidewall 135 overlaps with the electrode assembly 111 is a body sidewall. Since the suspended sidewall corresponds to the space accommodating the joint portion 112A and is hollow inside, it may exhibit irregular concave-convex surfaces due to collisions. The body sidewall, however, overlaps with the electrode assembly 111, and therefore generally has a regular planar shape. In some embodiments, the suspended sidewall may also have a regular planar shape, similar to the body sidewall.

[0102] Optionally, the joint 112A is a weld mark formed by welding the inner electrode tab 112 and the adapter tab 30.

[0103] Please continue reading. Figure 5 In some embodiments, the first concave surface 111A includes a first surface 111A1 and a second surface 111A2. The first surface 111A1 and the first wall 132A are arranged along a second direction Y, and the second surface 111A2 and the second wall 132B are arranged along a third direction Z. The inner electrode tab 112 extends from either the first surface 111A1 or the second surface 111A2. A space for accommodating the joint portion 112A is formed between the second surface 111A2 and the second wall 132B.

[0104] In some embodiments, when viewed along the second direction Y, the second surface 111A2 is a plane perpendicular to the third direction Z, the second wall 132B is parallel to the second surface 111A2, and the projection of the space formed between the second wall 132B, the second surface 111A2, and the suspended sidewall is rectangular to facilitate the accommodation of the joint 112A. Optionally, the joint 112A is parallel or inclined relative to the second surface 111A2.

[0105] Understandably, in some embodiments, when viewed along the second direction Y, the second surface 111A2 is a plane perpendicular to the third direction Z, and the second wall 132B is inclined relative to the second surface 111A2. The projection of the space formed between the second wall 112B, the second surface 111A2, and the suspended sidewall is triangular. The joint 112A is inclinedly disposed in the space formed between the second wall 132B and the second surface 111A2, and the inclination angle of the joint 112A is approximately the same as the inclination angle of the second wall 132B, so as to reduce the stress on the joint 112A due to excessive bending.

[0106] In some embodiments, when viewed along the first direction X, the area of ​​the first surface 111A1 that is separated from the first wall 132A protrudes toward the joint 112A in order to increase the capacity of the electrode assembly 111.

[0107] Example 2 Please see Figure 6 An embodiment of this application also provides a battery 100B. The difference between battery 100B and battery 100A lies in the different structures of the first connector 23, the adapter tab 30, and the first insulating member 51.

[0108] Please refer to the following: Figure 7 and Figure 8 The first connector 23 includes a fourth segment 234, a fifth segment 235, and a sixth segment 236. Along the third direction Z, the fourth segment 234 overlaps with the substrate 21, and the fifth segment 235 overlaps with the second wall 132B. The sixth segment 236 connects the fourth segment 234 and the fifth segment 235, and along the second direction Y, the sixth segment 236 overlaps with the first wall 132A. The first accommodating space 14A accommodates the fifth segment 235 and the sixth segment 236, thereby reducing the space occupied by the first connector 23 at the corner of the cell 10 along the third direction Z. Furthermore, when the injection molding equipment is positioned at the corner of the cell 10 to perform injection molding on the head of the battery 100B, it helps to reduce the risk of short circuit caused by the injection molding equipment contacting the first connector 23, thus improving the reliability of the battery 100B.

[0109] The second extension segment 32 includes a first sub-extension segment 321 and a second sub-extension segment 322 connected in sequence. The first sub-extension segment 321 is connected to the first extension segment 31 and overlaps with the corner seal portion 143 along the first direction X. The second sub-extension segment 322 overlaps with the fifth segment 235 along the third direction Z. The first accommodating space 14A accommodates the second extension segment 32 to reduce the space occupied by the adapter tab 30 at the corner of the cell 10 along the third direction Z. Furthermore, when the injection molding equipment is positioned at the corner of the cell 10 to perform injection molding on the head of the battery 100B, it helps to reduce the risk of short circuit caused by the injection molding equipment contacting the adapter tab 30, thereby improving the reliability of the battery 100B.

[0110] In some embodiments, along the third direction Z, the distance between the second sub-extension 322 and the substrate 21 is H1, 0.2mm≤H1≤2mm, so that the second sub-extension 322 is located in the first accommodating space 14A and the risk of interference between the second extension 322 and the second wall 132B is reduced.

[0111] Optionally, H1 can be any one of the following: 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, or any other value within the range of 0.2mm≤H1≤2mm.

[0112] In some embodiments, along the third direction Z, the distance between the fifth segment 235 and the substrate 21 is H2, 0.2mm≤H2≤2mm, so that the fifth segment 235 is located in the first accommodating space 14A and the risk of interference between the fifth segment 235 and the second wall 132B is reduced.

[0113] Optionally, H2 can be any one of the following: 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, or any other value within the range of 0.2mm≤H2≤2mm.

[0114] Please continue reading. Figure 7 and Figure 8 In some embodiments, the first insulating member 51 includes a fourth insulating portion 514, a fifth insulating portion 515, and a sixth insulating portion 516 connected in sequence. Along the third direction Z, the fourth insulating portion 514 is located between the fifth segment 235 and the second wall 132B, and the sixth insulating portion 516 is located between the substrate 21 and the top sealing portion 141. Along the second direction Y, the fifth insulating portion 515 is located between the sixth segment 236 and the first wall 132A. The fourth insulating portion 514 and the fifth insulating portion 515 are used to improve the insulation stability between the first connector 23 and the first recessed wall 132, and can reduce the risk of short circuits caused by the injection molding equipment contacting the first connector 23. The sixth insulating portion 516 is used to improve the insulation stability between the substrate 21 and the top sealing portion 141.

[0115] Please see Figure 9 The battery 100B includes a third separator 63, which includes a sixth separator 631 and a seventh separator 632. The sixth separator 631 covers the surface of the first sub-extension 321 away from the top seal 141, and the seventh separator 632 covers the portion where the fifth segment 235 overlaps with the second sub-extension 322. This reduces the risk of short circuits caused by the injection molding equipment contacting the first connector 23 or the adapter tab 30, thereby improving the reliability of the battery 100B.

[0116] Optionally, the third spacer 63 is a Mylar membrane.

[0117] 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.

[0118] Example 3 Please refer to the following: Figure 10An embodiment of this application also provides a battery 100C. The difference between battery 100C and battery 100A lies in the different structures of the first connector 23, the adapter tab 30, and the first insulating member 51.

[0119] Please refer to the following: Figure 11 and Figure 12 In some embodiments, the flexible circuit board 22 includes a first connecting segment 221, a second connecting segment 222, a third connecting segment 223, a fourth connecting segment 224, and a connector 225. One end of the first connecting segment 221 is connected to the surface of the substrate 21 away from the top wall 131 and is located in the protective member 40, while the other end of the first connecting segment 221 extends from the recess 412A. The third connecting segment 223 is located outside the protective member 40 and is disposed opposite to the first connecting segment 221 in a third direction Z. The second connecting segment 222 is located outside the protective member 40 and is bent to connect with the first connecting segment 221 and the third connecting segment 223. The fourth connecting segment 224 extends from the third connecting segment 223 in a direction away from the substrate 21. The connector 225 is disposed on the fourth connecting segment 224 and is used for electrical connection with an external circuit.

[0120] Along the second direction Y, the distance between the second connecting segment 222 and the corresponding first sidewall 133 is W2, where 0mm < W2 ≤ 3mm, to improve the bending mobility of the flexible circuit board 22 at the bend. Furthermore, when the injection molding equipment is positioned at the corner of the cell 10 to injection mold the head of the battery 100B, the clamps of the injection molding equipment need to hold the area near the bend of the flexible circuit board 22. Limiting the distance to 0mm < W2 ≤ 3mm helps to provide space for the clamps of the injection molding equipment.

[0121] Optionally, W2 can be one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any other value within the range of 0mm < W2 ≤ 3mm.

[0122] In some embodiments, along the second direction Y, the distance between the substrate 21 and the corresponding first sidewall 133 is W3, 3.5mm≤W3≤7.5mm, so that the bending point of the flexible circuit board 22 is located outside the substrate 21, which facilitates the improvement of the bending mobility of the bending point of the flexible circuit board 22.

[0123] Optionally, W3 can be any value within the range of 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 0mm < W2 ≤ 3mm.

[0124] Please refer to the following: Figure 11 and Figure 12Along the second direction Y, the distance between the first extension segment 31 and the corresponding first sidewall 133 is W1, where 4mm ≤ W1 ≤ 8mm. When W1 is too small (less than 4mm), the second extension segment 32 is easily placed close to the corner of the cell 10, causing the second extension segment 32 to be located outside the substrate 21. When the injection molding equipment is positioned at the corner of the cell 10 to perform injection molding on the head of the battery 100C, the injection molding equipment is likely to come into contact with the second extension segment 32, resulting in a short circuit risk. When W1 is too large (greater than 8mm), the first accommodating space 14A occupies a large space in the second direction Y, which will reduce the energy density of the battery 100C. By limiting 4mm ≤ W1 ≤ 8mm, the second extension segment 32 is located on the side of the substrate 21 closer to the second wall 132B. Under the shielding effect of the substrate 21, the risk of the injection molding equipment coming into contact with the second extension segment 32 and causing a short circuit is reduced, thereby improving the reliability of the battery 100C and reducing the energy density loss of the battery 100C.

[0125] Optionally, W1 can be any value within the range of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, or any other value satisfying 4mm≤W1≤8mm.

[0126] The first connector 23 is a U-shaped connector, comprising a seventh segment 237, an eighth segment 238, and a ninth segment 239. Along the third direction Z, the seventh segment 237 overlaps with the substrate 21, the eighth segment 238 is disposed on the side of the seventh segment 237 facing the second wall 132B, and the ninth segment 239 connects the seventh segment 237 and the eighth segment 238. The second extension segment 32 includes an overlapping segment 32A disposed between the seventh segment 237 and the eighth segment 238 to improve the stability of the connection between the adapter tab 30 and the first connector 23.

[0127] Looking along the third direction Z, the seventh segment 237, the eighth segment 238 and the overlapping segment 32A are all located within the substrate 21, so as to reduce the risk of short circuit caused by the injection molding equipment contacting the first connector 23 or the adapter tab 30 under the shielding effect of the substrate 21, thereby improving the reliability of the battery 100C.

[0128] In some embodiments, when viewed along the second direction Y, the second extension 32 bends in a "U" shape around the eighth segment 238 to further improve the stability of the connection between the adapter tab 30 and the first connector 23.

[0129] Please continue reading. Figure 11 and Figure 12In some embodiments, the first insulating member 51 includes a seventh insulating portion 517 and an eighth insulating portion 518. The seventh insulating portion 517 is located between the substrate 21 and the second wall 132B, and the eighth insulating portion 518 is located between the substrate 21 and the top sealing portion 141. Viewed along the first direction X, the seventh insulating portion 517 covers the first connector 23. The seventh insulating portion 517 is used to improve the insulation stability between the first connector 23 and the first recessed wall 132, and can reduce the risk of short circuit caused by the injection molding equipment contacting the first connector 23. The eighth insulating portion 518 is used to improve the insulation stability between the substrate 21 and the top sealing portion 141.

[0130] In some embodiments, the second insulating member 52 is integrally disposed with the first insulating member 61.

[0131] 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.

[0132] Example 4 Please see Figure 13 An embodiment of this application also provides a battery 100D. The difference between battery 100D and battery 100A lies in the different structures of the first concave wall 132 and the adapter tab 30, and the first connector 23 is replaced by a second connector 24.

[0133] Please refer to the following: Figure 14 and Figure 15 The first concave wall 132 includes a third wall 132C. Viewed along the first direction X, the third wall 132C is inclined relative to the top wall 131 and the first side wall 133. The angle between the third wall 132C and the top wall 131 is α, where 110°≤α≤150°. The corner seal 143 includes a first side 143A parallel to the third wall 132C, and the adapter tab 30 extends from the first side 143A.

[0134] Optionally, α can be one of 110°, 120°, 130°, 140°, 150°, or any other value within the range of 110°≤α≤150°.

[0135] The top seal portion 141 bends toward the top wall 131. The top seal portion 141 includes a top seal body portion 141A and a top seal extension portion 141B. Along the third third direction Z, the top seal body portion 141A overlaps with the top wall 131, and the top seal extension portion 141B overlaps with the third wall 132C. The top seal body portion 141A is connected to the top wall 131, and the top seal extension portion 141B is connected to the corner seal portion 143 and is located on one side of the first side 143A along the second direction Y, so as to improve the sealing stability of the encapsulation portion 14.

[0136] The side seal portion 142 bends toward the first sidewall 133. The side seal portion 142 includes a side seal body portion 142A and a side seal extension portion 142B. Along the second direction Y, the side seal body portion 142A overlaps with the first sidewall 133, and the side seal extension portion 142B overlaps with the third wall 132C. The side seal body portion 142A is connected to the first sidewall 213, and the side seal extension portion 142B is connected to the corner seal portion 143 and is located on the other side of the first sidewall 143A along the second direction Y, so as to improve the packaging stability of the encapsulation portion 14.

[0137] Please continue reading. Figure 14 and Figure 15 The circuit board assembly 20 includes a second connector 24, which is connected to the side of the substrate 21 facing the third wall 132C. An adapter tab 30 is connected to the second connector 24 to shorten the connection path between the adapter tab 30 and the substrate 21. A protective member 40 covers the second connector 24 to improve the structural stability of the second connector 24 at the head of the battery 100D.

[0138] The adapter tab 30 extends from the first side 143A in a direction perpendicular to the third wall 132C. The second connector 24 includes a first part 241, a second part 242, and a third part 243. Along the third direction Z, the first part 241 overlaps with the substrate 21. Along the first direction X, the second part 242 overlaps with the portion of the adapter tab 30 extending from the first side 143A. The third part 243 connects between the first part 241 and the second part 242. The first accommodating space 14A accommodates the second part 242 and the adapter tab 30 to reduce the space occupied by the second connector 24 and the adapter tab 30 at the corner of the cell 10 along the third direction Z. When the injection molding equipment is positioned at the corner of the cell 10 to perform injection molding on the head of the battery 100D, this helps to reduce the risk of short circuit caused by the injection molding equipment contacting the second connector 24 or the adapter tab 30, thereby improving the reliability of the battery 100D.

[0139] In some embodiments, the first insulating member 51 is located between the first portion 241 and the top sealing portion 141, and between the substrate 21 and the top sealing portion 141.

[0140] Please see Figure 16 In some embodiments, the battery 100D includes a third insulating member 53, which includes a first insulating region 531 and a second insulating region 532. Along the first direction X, the first insulating region 531 covers at least one side of the overlapping portion of the adapter tab 30 and the second connector 24, and the second insulating region 532 covers the portion of the second connector 24 located outside the substrate 21, so as to reduce the risk of short circuit caused by the injection molding equipment contacting the second connector 24 or the adapter tab 30, and improve the reliability of the battery 100D.

[0141] Optionally, the third insulating element 53 is a Mylar membrane.

[0142] Please see Figure 17 , Figure 17 The top seal 141 and side seal 142 are in an unfolded, folded state. In some embodiments, a first concave surface 111A is provided at the corner adjacent to the first concave wall 132 of the electrode assembly 111. The first concave surface 111A is arranged parallel to the third wall 132C, and the inner electrode tab 112 extends from the first concave surface 111A. The inner electrode tab 112 is connected to the adapter tab 30 (i.e., the first extension 31) and forms a joint 112A, so that the adapter tab 30 is electrically connected to the electrode assembly 11. The joint 112A is located between the first concave surface 111A and the first concave wall 132, so that the joint 112A and the electrode assembly 111 share the space in the third direction Z, which is beneficial to improving the energy density of the battery 100D. The first concave surface 111A is arranged parallel to the third wall 132C.

[0143] Apart from the differences mentioned above, the parameters of battery 100D and battery 100A are roughly the same. Please refer to the description of battery 100A above.

[0144] Example 5 Please refer to the following: Figure 18 and Figure 19 An embodiment of this application also provides a battery 100E. The difference between battery 100E and battery 100D lies in the different structures of the second connector 24 and the adapter tab 30.

[0145] The adapter tab 30 includes a third extension section 33 and a fourth extension section 34. The third extension section 33 extends from the first side 143A along the third direction Z. The fourth extension section 34 is bent and connected to the third extension section 33 and is spaced apart from the top sealing extension 141B along the second direction Y.

[0146] The second connector 24 includes a fourth part 244, a fifth part 245, and a sixth part 246. The fourth part 244 includes a third region 244A and a fourth region 244B. Along the third direction Z, the third region 244A overlaps with the substrate 21, and the fourth region 244B overlaps with the third wall 132C. The fifth part 245 is disposed on the side of the fourth region 244B facing the third wall 132C. The sixth part 246 connects the fourth region 244B and the fifth part 245. A fourth extension 34 is disposed between the fourth region 244B and the fifth part 245 to improve the stability of the connection between the adapter tab 30 and the second connector 24. Optionally, the fifth part 245 is located in the first accommodating space 14A.

[0147] Apart from the differences mentioned above, the parameters of battery 100E and battery 100D are roughly the same. Please refer to the description of battery 100D above.

[0148] Example 6 Please refer to the following: Figure 20An embodiment of this application also provides a battery 100F. The difference between battery 100F and battery 100C lies in the different positions of the adapter tab 30 relative to the first concave wall 130.

[0149] Please refer to the following: Figure 21 and Figure 22 The packaging bag 12 includes a main body 13 and a sealing part 14. The main body 13 is the part of the packaging bag 12 with a perforated groove. The electrode assembly 11 is disposed inside the main body 13. The main body 13 includes a top wall 131, a first concave wall 132 and a first side wall 133. Viewed along the first direction X, the first side wall 133 and the top wall 131 are spaced apart along the second direction Y and the third direction Z. The first concave wall 132 connects the first side wall 133 and the top wall 131.

[0150] The encapsulation part 14 includes a top sealing part 141, a side sealing part 142 and a corner sealing part 143. The top sealing part 141 is connected to the top wall 131, the side sealing part 142 is connected to the first side wall 133, and the corner sealing part 143 is connected to the first concave wall 132, the side sealing part 142 and the top sealing part 141 and forms a first accommodating space 14A. The corner sealing part 143 is used to seal the first concave wall 132.

[0151] The top seal portion 141 bends toward the top wall 131 to reduce the space occupied by the top seal portion 141 in the third direction Z, which is beneficial to improving the energy density of the battery 100 F. The top seal portion 141 includes a top seal body portion 141A and a top seal extension portion 141B. Along the third direction Z, the top seal body portion 141A overlaps with the top wall 131, and the top seal extension portion 141B overlaps with the second wall 132B. The top seal body portion 141A is connected to the top wall 131, and the top seal extension portion 141B is connected to the corner seal portion 143 to improve the encapsulation stability of the package portion 14.

[0152] The circuit board assembly 20 includes a substrate 21 disposed on the top wall 131. One end of the adapter tab 30 is electrically connected to the electrode assembly 11, and the other end of the adapter tab 30 extends from the top cover portion 141 and is electrically connected to the substrate 21. Specifically, the other end of the adapter tab 30 extends from the top cover body portion 141A.

[0153] The protective component 40 connects the top wall 131 and the first recessed wall 132. The first recessed wall 132 increases the connection area of ​​the protective component 40 at the corner of the cell 10, thereby improving the connection stability between the protective component 40 and the cell 10. The protective component 40 covers the top seal 141, the corner seal 143, the adapter tab 30, and the substrate 21. The protective component 40 is used to improve the structural strength of the battery head of the battery 100F. When the battery 100F undergoes drop tests or mechanical abuse, it can reduce the risk of damage to the top seal 141, the corner seal 143, the adapter tab 30, and the substrate 21, thereby improving the reliability of the battery 100F. By having the other end of the adapter tab 30 extend from the top seal 141 and be electrically connected to the substrate 21, the adapter tab 30 is moved away from the corner of the cell 10 along the second direction Y, which helps to reduce the risk of short circuit caused by the injection molding equipment contacting the adapter tab 30.

[0154] In some embodiments, the first connector 23 is a "U"-shaped connector piece. Along the third direction Z, the first connector 23 overlaps with the substrate 21. Under the shielding of the substrate 21, it is beneficial to reduce the risk of short circuit caused by the injection molding equipment contacting the first connector 23, thereby improving the reliability of the battery 100F.

[0155] 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.

[0156] Example 7 Please see Figure 23 An embodiment of this application also provides a terminal device 200A, including the battery (100A, 100B, 100C, 100D, 100E, 100F) in any of the above embodiments.

[0157] 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.

[0158] In summary, in the above-mentioned batteries (100A, 100B, 100C, 100D, 100E, 100F) and terminal device 200, the protective component 40 connects the top wall 131 and the first concave wall 132. The first concave wall 132 can increase the connection area of ​​the protective component 40 at the corner of the cell 10, thereby improving the connection stability between the protective component 40 and the cell 10. The protective component 40 covers the top seal 141, corner seal 143, adapter tab 30, and substrate 21. The protective component 40 is used to improve the structural strength of the battery (100A, 100B, 100C, 100D, 100E, 100F) head. When the battery (100A, 100B, 100C, 100D, 100E, 100F) is subjected to drop test or mechanical abuse, it can reduce the risk of damage to the top seal 141, corner seal 143, adapter tab 30, and substrate 21, thereby improving the reliability of the battery (100A, 100B, 100C, 100D, 100E, 100F).

[0159] 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 by, The battery includes: The battery cell includes: Electrode assembly; The packaging bag includes a main body and a sealing part. The electrode assembly is disposed in the main body. The main body includes a top wall, a first concave wall, and a first side wall. When viewed along a first direction, the first side wall and the top wall are spaced apart along a second direction and a third direction. The first concave wall connects the first side wall and the top wall. The first direction is the thickness direction of the battery cell. The first direction, the second direction, and the third direction are perpendicular to each other. The sealing part includes a top seal, a side seal, and a corner seal. The top seal is connected to the top wall. The side seal is connected to the first side wall. The corner seal is connected to the first concave wall, the side seal, and the top seal. A first accommodating space is formed between the corner seal, the first concave wall, the side seal, and the top seal. A circuit board assembly, the circuit board assembly including a substrate, the substrate being disposed on the top wall; An adapter tab, one end of which is electrically connected to the electrode assembly, and the other end of which extends from the corner seal and is electrically connected to the substrate; A protective member, the protective member connecting the top wall and the first recessed wall, the protective member covering the top sealing portion, the corner sealing portion, the adapter tab and the substrate, and a portion of the protective member being located in the first accommodating space; The electrode assembly includes an electrode group and an inner electrode tab. The electrode group has a first concave surface at the corner adjacent to the first concave wall. The inner electrode tab extends from the first concave surface and is connected to the adapter tab to form a joint. The joint is located between the first concave surface and the first concave wall.

2. The battery of claim 1, wherein, Along the second direction, the width of the adapter tab is L1, where 2mm ≤ L1 ≤ 4mm.

3. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The protective member includes a cover and a protrusion. The cover includes a first sub-cover and a second sub-cover. The first sub-cover and the second sub-cover are connected along the second direction. Along the third direction, the first sub-cover overlaps with the top wall, and the second sub-cover overlaps with the first concave wall. The protrusion is connected to the surface of the second sub-cover near the first concave wall, and at least a portion of the protrusion is located in the first accommodating space.

4. The battery of claim 3, wherein the cathode is a lithium cobalt oxide cathode. The circuit board assembly includes a flexible circuit board, which is connected to the substrate. The protective component covers the portion where the flexible circuit board connects to the substrate. The second sub-cover portion has a recess at a corner away from the first sub-cover portion, and the flexible circuit board extends out from the recess.

5. The battery of claim 4, wherein the cathode is a lithium cobalt oxide cathode. The flexible circuit board includes a first connecting segment, a second connecting segment, a third connecting segment, a fourth connecting segment, and a connector. One end of the first connecting segment is connected to the surface of the substrate away from the top wall and is located in the protective member. The other end of the first connecting segment extends out from the recess. The third connecting segment is located outside the protective member and is disposed opposite to the first connecting segment in a third direction. The second connecting segment is located outside the protective member and is bent and connected to the first connecting segment and the third connecting segment. The fourth connecting segment extends from the third connecting segment in a direction away from the substrate. The connector is disposed in the fourth connecting segment and is used for electrical connection with an external circuit.

6. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The main body includes two first sidewalls and two first concave walls. The two first sidewalls are arranged opposite each other along the second direction. The two first concave walls are connected to both ends of the top wall. The encapsulation part includes two side seals and two corner seals. Each side seal is connected to one first sidewall. Each corner seal is connected to one first concave wall, one side seal, and one top seal. The battery includes two of the adapter tabs, each of the adapter tabs extending from one of the corner seals; The protective component connects the top wall and the two first recessed walls, and the protective component covers the top seal, the two corner seals, the two adapter tabs, and the substrate.

7. The battery of claim 6, wherein the cathode is a lithium cobalt oxide cathode. The main body includes a bottom wall, and the top wall and the bottom wall are disposed opposite each other along the third direction; The first concave wall includes a first wall and a second wall. When viewed along the first direction, the first wall is connected to the top wall and extends toward the bottom wall, and the second wall is connected to the end of the first wall away from the top wall and extends toward the corresponding first side wall.

8. The battery of claim 7, wherein the cathode is a lithium cobalt oxide cathode. The top sealing portion bends toward the top wall. The top sealing portion includes a top sealing body component and a top sealing extension. Along the third direction, the top sealing body component overlaps with the top wall, and the top sealing extension component overlaps with the second wall. The top sealing body component is connected to the top wall, and the top sealing extension component is connected to the corner sealing portion.

9. The battery of claim 8, wherein the cathode is a lithium cobalt oxide cathode. The adapter tab includes a first extension section and a second extension section. The first extension section extends out of the corner seal portion along the third direction. The second extension section connects to the first extension section and is spaced apart from the top seal extension portion along the second direction. The circuit board assembly includes a first connector connected to the surface of the substrate near the second wall, a second extension connected to the first connector, and a protective member covering the first connector.

10. The battery as claimed in claim 9, characterized in that, The first connector includes a first segment, a second segment, and a third segment. The first segment includes a first region and a second region. Along the third direction, the first region overlaps with the substrate, the second region overlaps with the second wall, the second segment is disposed on the side of the second region near the second wall, the third segment connects the second region and the second segment, and the second extension segment is disposed between the second region and the second segment. The battery includes a first insulating member, which includes a first insulating portion, a second insulating portion, and a third insulating portion connected in sequence. Along the third direction, the first insulating portion is located between the second segment and the second wall, the second insulating portion is located between the first region and the top sealing portion, and the third insulating portion is located between the substrate and the top sealing portion.

11. The battery as claimed in claim 10, characterized in that, The battery includes a second insulating member that covers the corner seal and the portion of the side seal that extends out of the second wall in a third direction.

12. The battery as claimed in claim 9, characterized in that, The first connector includes a fourth segment, a fifth segment, and a sixth segment. Along the third direction, the fourth segment overlaps with the substrate, the fifth segment overlaps with the second wall, and the sixth segment connects the fourth segment and the fifth segment. Along the second direction, the sixth segment overlaps with the first wall. The second extension segment includes a first sub-extension segment and a second sub-extension segment connected in sequence. The first sub-extension segment is connected to the first extension segment. The first sub-extension segment overlaps with the corner seal portion along the first direction. The second sub-extension segment overlaps with the fifth segment along the third direction. Along the third direction, the distance between the second sub-extension segment and the substrate is H1, 0.2mm≤H1≤2mm, and the distance between the fifth segment and the substrate is H2, 0.2mm≤H2≤2mm.

13. The battery as claimed in claim 9, characterized in that, The first connector includes a seventh segment, an eighth segment, and a ninth segment. Along the third direction, the seventh segment overlaps with the substrate, the eighth segment is disposed on the side of the seventh segment facing the second wall, and the ninth segment connects the seventh segment and the eighth segment. The second extension segment includes an overlapping segment disposed between the seventh segment and the eighth segment, and when viewed along the third direction, the seventh segment, the eighth segment, and the overlapping segment are all located within the substrate.

14. The battery as claimed in claim 6, characterized in that, The first concave wall includes a third wall. When viewed along the first direction, the third wall is inclined relative to the top wall and the first side wall. The angle between the third wall and the top wall is α, 110°≤α≤150°. The corner seal includes a first side parallel to the third wall, and the adapter tab extends from the first side. The top sealing portion bends toward the top wall. The top sealing portion includes a top sealing body portion and a top sealing extension portion. Along the third direction, the top sealing body portion overlaps with the top wall, and the top sealing extension portion overlaps with the third wall. The top sealing body portion is connected to the top wall, and the top sealing extension portion is connected to the corner sealing portion and is located on one side of the first side along the second direction. The circuit board assembly includes a second connector connected to the side of the substrate facing the third wall, an adapter tab connected to the second connector, and a protective member covering the second connector.

15. The battery as claimed in claim 14, characterized in that, The adapter tab extends from the first side in a direction perpendicular to the third wall; The second connector includes a first part, a second part, and a third part. The first part overlaps with the substrate along the third direction. The portion of the adapter tab extending from the first side overlaps with the second part along the first direction. The third part is connected between the first part and the second part.

16. The battery as claimed in claim 14, characterized in that, The adapter tab includes a third extension section and a fourth extension section. The third extension section extends from the first side along the third direction. The fourth extension section is bent and connected to the third extension section and is spaced apart from the top sealing extension section along the second direction. The second connector includes a fourth part, a fifth part, and a sixth part. The fourth part includes a third region and a fourth region. Along the third direction, the third region overlaps with the substrate, and the fourth region overlaps with the third wall. The fifth part is disposed on the side of the fourth region facing the third wall, and the sixth part connects the fourth region and the fifth part. The fourth extension is disposed between the fourth region and the fifth part.

17. The battery as claimed in claim 14, characterized in that, The battery includes a third insulating member, which includes a first insulating region and a second insulating region. Along the first direction, the first insulating region covers at least one side of the overlapping portion of the adapter tab and the second connector, and the second insulating region covers the portion of the second connector located outside the substrate.

18. The battery as claimed in claim 1, characterized in that, The side sealing portion bends toward the first sidewall. The side sealing portion includes a side sealing body portion and a side sealing extension portion. Along the second direction, the side sealing body portion overlaps with the first sidewall, the side sealing extension portion overlaps with the first concave wall, the side sealing body portion is connected to the first sidewall, and the side sealing extension portion is connected to the corner sealing portion. The protective component covers the side seal extension.

19. The battery as claimed in claim 7, characterized in that, The first concave surface includes a first surface and a second surface. The first surface and the first wall are arranged along the second direction, and the second surface and the second wall are arranged along the third direction. The inner electrode tab extends from the first surface or the second surface.

20. A battery, characterized in that, The battery includes: The battery cell includes: Electrode assembly; A packaging bag includes a main body and a packaging part. The electrode assembly is disposed within the main body. The main body includes a top wall, a first concave wall, and a first side wall. Viewed along a first direction, the first side wall and the top wall are spaced apart along a second direction and a third direction. The first concave wall connects the first side wall and the top wall. The first direction is the thickness direction of the battery cell. The first direction, the second direction, and the third direction are perpendicular to each other. The packaging part includes a top seal, a side seal, and a corner seal. The top seal is connected to the top wall. The side seal is connected to the first side wall. The corner seal is connected to the first concave wall, the side seal, and the top seal and forms a first accommodating space. The side seal and the top seal are spaced apart. A circuit board assembly, the circuit board assembly including a substrate, the substrate being disposed on the top wall; An adapter tab, one end of which is electrically connected to the electrode assembly, and the other end of which extends from the top seal and is electrically connected to the substrate; A protective component, the protective component connecting the top wall and the first recessed wall, the protective component covering the top seal, the corner seal, the adapter tab and the substrate.

21. A terminal device, characterized in that, Includes the battery as described in any one of claims 1 to 20.

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