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

Technical Field

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

[0002] In the existing battery structure, the battery includes a battery cell and a circuit board assembly. The battery head generally refers to the part of the battery cell where the circuit board assembly is set. When the battery is subjected to a drop test or mechanical abuse (such as collision, extrusion, drop, etc.), the battery head is easily damaged and fails under the impact of external forces, reducing the reliability of the battery. Summary of the invention

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

[0004] An embodiment of the present application provides a battery, the battery includes a battery cell, a circuit board assembly, a transfer tab and a protective plate. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a packaging part, the electrode assembly is arranged in the main body, the main body includes a top wall, a first concave wall and a first side wall, and the first side wall and the top wall are arranged in a spaced relationship along the second direction and the third direction when viewed along the first direction, and 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 packaging part includes a top seal part, a side seal part and a corner seal part, the top seal part is connected to the top wall, the side seal part is connected to the first side wall, the corner seal part is connected to the first concave wall, the side seal part and the top seal part, and the corner seal part, the first concave wall, the side seal part and the top seal part form a first accommodating space. The circuit board assembly includes a substrate, and the substrate is arranged on the top wall. One end of the transfer tab is electrically connected to the electrode assembly, and the other end of the transfer tab extends from the corner seal part and is electrically connected to the substrate. The protective member connects the top wall and the first concave wall, covers the top sealing portion, the corner sealing portion, the transfer tab and the substrate, and part of the protective member is located in the first accommodating space.

[0005] In the above-mentioned battery, the protective member connects the top wall and the first concave wall, and the first concave wall can increase the connection area of ​​the protective member at the corner of the battery cell, thereby improving the connection stability between the protective member and the battery cell. The protective member covers the adapter lug, so that when the width of the adapter lug is small, the risk of the adapter lug breaking can be reduced, and the connection strength between the adapter lug and the substrate can be improved. The protective member also covers the top seal, the corner seal, and the substrate, which can strengthen the connection strength between the components, and can also reduce the risk of damage to the top seal, the corner seal, the adapter lug, and the substrate when the battery is subjected to a drop test or mechanical abuse, thereby improving the reliability of the battery.

[0006] In some embodiments of the present application, along the second direction, the width of the adapter tab is L1, 2mm≤L1≤4mm, so as to reduce the risk of insufficient current carrying capacity of the adapter tab and reduce the space occupied by the adapter tab on the battery head.

[0007] In some embodiments of the present application, the protective member includes a cover portion and a convex portion. The cover portion includes a first sub-cover portion and a second sub-cover portion, the first sub-cover portion and the second sub-cover portion are connected along the second direction, and along the third direction, the first sub-cover portion overlaps with the top wall, and the second sub-cover portion overlaps with the first concave wall. The convex portion is connected to the surface of the second sub-cover portion close to the first concave wall, and at least part of the convex portion is located in the first accommodating space to facilitate connection with the first concave wall.

[0008] In some embodiments of the present application, the circuit board assembly includes a flexible circuit board, and the flexible circuit board is connected to the substrate. The 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. The second sub-cover portion is provided with a recess at a corner away from the first sub-cover portion, and the flexible circuit board extends from the recess to expand the movable angle of the flexible circuit board.

[0009] In some embodiments of the present application, the main body includes two first side walls and two first concave walls, the two first side walls are arranged opposite to each other along the second direction, and the two first concave walls are connected to the two ends of the top wall. The packaging portion includes two side sealing portions and two corner sealing portions, each side sealing portion is connected to a first side wall, and each corner sealing portion is connected to a first concave wall, a side sealing portion and a top sealing portion. The battery includes two adapter tabs, each of which extends from a corner sealing portion. The protective member connects the top wall and the two first concave walls, and the protective member covers the top sealing portion, the two corner sealing portions, the two adapter tabs and the substrate.

[0010] In some embodiments of the present application, the main body includes a bottom wall, and the top wall and the bottom wall are arranged opposite to 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 an 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 the protective member.

[0011] In some embodiments of the present application, the top seal portion is bent toward the top wall. The top seal portion includes a top seal body component and a top seal extension portion. Along the third direction, the top seal body portion overlaps with the top wall, the top seal extension portion overlaps with the second wall, the top seal body portion is connected to the top wall, and the top seal extension portion is connected to the corner seal portion.

[0012] In some embodiments of the present application, 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, and the second extension section connects 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, the first connector is connected to a surface of the substrate close to the second wall, and the second extension section is connected to the first connector to shorten the connection path between the adapter tab and the substrate. The protective member covers the first connector to improve the structural stability of the first connector at the battery head.

[0013] In some embodiments of the present application, the first connector includes a first section, a second section and a third section. The first section includes a first area and a second area. Along the third direction, the first area overlaps with the substrate, the second area overlaps with the second wall, the second section is arranged on the side of the second area close to the second wall, and the third section is connected between the second area and the second section. The second extension section is arranged between the second area and the second section to improve the stability of the connection between the adapter tab and the first connector. The battery includes a first insulating member, and the first insulating member 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 section and the second wall, the second insulating portion is located between the first area and the top seal portion, and the third insulating portion is located between the substrate and the top seal portion. The first insulating portion is used to improve the insulation stability between the first connector and the first concave 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 seal portion. The third insulating portion is used to improve the insulation stability between the substrate and the top seal portion.

[0014] In some embodiments of the present application, the battery includes a second insulating member, which covers the corner seal and the side seal that extend out of the second wall along a third direction to reduce the risk of the injection molding equipment damaging the corner seal or the side seal and improve the reliability of the battery.

[0015] In some embodiments of the present application, the first connector includes a fourth section, a fifth section and a sixth section. Along the third direction, the fourth section overlaps with the substrate, the fifth section overlaps with the second wall, the sixth section is connected between the fourth section and the fifth section, and along the second direction, the sixth section overlaps with the first wall. The second extension section includes a first sub-extension section and a second sub-extension section connected in sequence, the first sub-extension section connects the first extension section, the first sub-extension section overlaps with the corner seal along the first direction, and the second sub-extension section overlaps with the fifth section along the third direction. Along the third direction, the distance between the second sub-extension section and the substrate is H1, 0.2mm≤H1≤2mm, and the distance between the fifth section and the substrate is H2, 0.2mm≤H2≤2mm. The first accommodation space accommodates the fifth section, the sixth section and the second extension section to reduce the space occupied by the first connector and the adapter tab at the corner of the battery cell along the third direction, and when the injection molding equipment is set at the corner of the battery cell to inject the battery head, it is beneficial to reduce the risk of the injection molding equipment contacting the first connector or the adapter tab to cause a short circuit, thereby improving the reliability of the battery.

[0016] In some embodiments of the present application, the first connector includes a seventh section, an eighth section, and a ninth section. Along the third direction, the seventh section overlaps with the substrate, the eighth section is arranged on the side of the seventh section facing the second wall, and the ninth section is connected between the seventh section and the eighth section. The second extension section includes an overlapping section arranged between the seventh section and the eighth section to improve the stability of the connection between the adapter tab and the first connector. And when observed along the third direction, the seventh section, the eighth section, and the overlapping section are all located inside the substrate, so that under the shielding effect of the substrate, the risk of short circuit caused by the injection molding equipment contacting the first connector or the adapter tab is reduced, thereby improving the reliability of the battery.

[0017] In some embodiments of the present application, the first concave wall includes a third wall, and when viewed along the 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, 110°≤α≤150°. The corner seal portion includes a first side edge parallel to the third wall, and the adapter pole ear extends from the first side edge. The top seal portion is bent toward the top wall, and the top seal portion includes a top seal body portion and a top seal extension portion. Along the third direction, the top seal body portion overlaps with the top wall, the top seal extension portion overlaps with the third wall, the top seal body portion is connected to the top wall, and the top seal extension portion is connected to the corner seal portion and is located on one side of the first side edge along the second direction. The circuit board assembly includes a second connector, the second connector is connected to the side of the substrate facing the third wall, and the adapter pole ear is connected to the second connector to shorten the connection path between the adapter pole ear and the substrate. The protective member covers the second connector to improve the structural stability of the second connector at the battery head.

[0018] In some embodiments of the present application, the adapter lug extends from the first side edge in a direction perpendicular to the third wall. The second connector includes a first portion, a second portion, and a third portion. The first portion overlaps with the substrate along the third direction, the portion of the adapter lug extending from the first side edge overlaps with the second portion along the first direction, and the third portion is connected between the first portion and the second portion. The first accommodation space accommodates the second portion and the adapter lug to reduce the space occupied by the second connector and the adapter lug at the corner of the battery cell along the third direction. When the injection molding equipment is set at the corner of the battery cell to perform injection molding on the battery head, it is beneficial to reduce the risk of the injection molding equipment contacting the second connector or the adapter lug to cause a short circuit, thereby improving the reliability of the battery.

[0019] In some embodiments of the present application, 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 seal extension along the second direction. The second connector includes a fourth portion, a fifth portion and a sixth portion. The fourth portion includes a third region and a fourth region, along the third direction, the third region overlaps with the substrate, the fourth region overlaps with the third wall, the fifth portion is disposed on a side of the fourth region facing the third wall, and the sixth portion is connected between the fourth region and the fifth portion. The fourth extension section is disposed between the fourth region and the fifth portion to improve the stability of the connection between the adapter tab and the second connector.

[0020] In some embodiments of the present application, 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 ear 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 ear, thereby improving the reliability of the battery.

[0021] In some embodiments of the present application, the side seal portion is bent toward the first side wall. The side seal portion includes a side seal body portion and a side seal extension portion. Along the second direction, the side seal body portion overlaps with the first side wall, the side seal extension portion overlaps with the first concave wall, the side seal body portion is connected to the first side wall, and the side seal extension portion is connected to the corner seal portion. The protective member covers the side seal extension portion to improve the structural strength of the battery head.

[0022] In some embodiments of the present application, the electrode assembly includes a pole piece group and an inner pole ear, the pole piece group is provided with a first concave surface at a corner adjacent to the first concave wall, and the inner pole ear extends from the first concave surface. The inner pole ear is connected to the transfer pole ear and forms a joint, and the joint is located between the first concave surface and the first concave wall, so that the joint and the pole piece group share the space in the third direction, which is beneficial to improve the energy density of the battery.

[0023] The embodiment of the present application also provides a battery, the battery includes a battery cell, a circuit board assembly, a transfer tab and a protective plate. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a packaging part, the electrode assembly is arranged in the main body, the main body includes a top wall, a first concave wall and a first side wall, and the first side wall and the top wall are arranged at intervals along the second direction and the third direction when viewed along the first direction, and 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 packaging part includes a top seal part, a side seal part and a corner seal part, the top seal part is connected to the top wall, the side seal part is connected to the first side wall, the corner seal part is connected to the first concave wall, the side seal part and the top seal part and forms a first accommodating space, and the side seal part and the top seal part are arranged at intervals. The circuit board assembly includes a substrate, and the substrate is arranged on the top wall. One end of the transfer tab is electrically connected to the electrode assembly, and the other end of the transfer tab extends from the top seal part and is electrically connected to the substrate. The protective member connects the top wall and the first concave wall, and covers the top sealing portion, the corner sealing portion, the transfer tab and the substrate.

[0024] In the above-mentioned battery, the protective member connects the top wall and the first concave wall, and the first concave wall can increase the connection area of ​​the protective member at the corner of the battery cell, thereby improving the connection stability between the protective member and the battery cell. The protective member covers the top seal, the corner seal, the adapter lug and the substrate. The protective member is used to improve the structural strength of the battery head. When the battery is subjected to a drop test or mechanical abuse, it can reduce the risk of damage to the top seal, the corner seal, the adapter lug and the substrate, thereby improving the reliability of the battery. By extending the other end of the adapter lug from the top seal and electrically connecting to the substrate, the adapter lug is moved away from the corner of the battery cell along the second direction, which is beneficial to reduce the risk of the injection molding equipment contacting the adapter lug and causing a short circuit.

[0025] In some embodiments of the present application, the embodiments of the present application further provide a terminal device, the terminal device comprising any one of the batteries in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the structure of the battery head in one embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the disassembled structure of a battery cell in one embodiment of the present application.

[0029] Figure 4 It is a schematic structural diagram of a second isolation member of a battery in one embodiment of the present application.

[0030] Figure 5 It is a schematic structural diagram of an electrode assembly of a battery in one embodiment of the present application.

[0031] Figure 6 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0032] Figure 7 It is a schematic diagram of the structure of the battery head in one embodiment of the present application.

[0033] Figure 8 It is a schematic diagram of the disassembled structure of a battery cell in one embodiment of the present application.

[0034] Fig. 9 It is a schematic structural diagram of a third isolation member of a battery in one embodiment of the present application.

[0035] Fig.10 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0036] Fig.11 It is a schematic diagram of the structure of the battery head in one embodiment of the present application.

[0037] Fig.12 It is a schematic diagram of the disassembled structure of a battery cell in one embodiment of the present application.

[0038] Fig.13 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0039] Fig.14 It is a schematic diagram of the structure of the battery head in one embodiment of the present application.

[0040] Fig.15 It is a schematic diagram of the disassembled structure of a battery cell in one embodiment of the present application.

[0041] Fig.16 It is a schematic structural diagram of a third insulating member of a battery in one embodiment of the present application.

[0042] Fig.17 It is a schematic structural diagram of an electrode assembly of a battery in one embodiment of the present application.

[0043] Fig.18 It is a schematic diagram of the structure of the battery head in one embodiment of the present application.

[0044] Fig.19 It is a schematic diagram of the disassembled structure of a battery cell in one embodiment of the present application.

[0045] Fig. 20 It is a schematic diagram of the structure of a battery in one embodiment of the present application.

[0046] Fig.21 It is a schematic diagram of the structure of the battery head in one embodiment of the present application.

[0047] Fig. 22 It is a schematic diagram of the disassembled structure of a battery cell in one embodiment of the present application.

[0048] Fig.23 It is a schematic diagram of the structure of a terminal device in another embodiment of the present application.

[0049] Main component symbols Batteries 100A, 100B, 100C, 100D, 100E, 100F Terminal device 200 Battery 10 Electrode assembly 11 Pole piece group 111 First concave surface 111A First side 111A1 Second side 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 side wall 135 Packaging unit 14 The first accommodating space 14A Gap 14B Top seal 141 Top seal body part 141A Top seal extension 141B Second side 141B1 Side seal portion 142 Side seal body part 142A Side seal extension 142B The third side 142B1 Corner seal 143 First side 143A Circuit board assembly 20 Substrate 21 Flexible circuit board 22 The first connecting section 221 The second connecting section 222 The third connecting section 223 Fourth connecting section 224 Connector 225 First connecting member 23 First paragraph 231 First area 231A Second area 231B 232 Section 3 233 Section 4 234 Section 5 235 Section 6 236 Section 7 237 Section 8 238 Section 9 239 The second connecting member 24 Part 1241 Part 2242 Part 3243 Part 4 244 Third area 244A Fourth area 244B Part 5 245 Part 6 246 Adapter tab 30 The first extension section 31 The second extension section 32 The first sub-extension section 321 The second sub-extension section 322 Overlapping segment 32A The third extension section 33 Fourth extension section 34 Protective element 40 Cover 41 First sub-cover portion 411 Second sub-cover 412 Recessed portion 412A Projection 42 First insulating member 51 First insulating portion 511 Second insulating portion 512 The third insulating portion 513 Fourth insulating portion 514 Fifth insulating portion 515 Sixth insulating portion 516 Seventh insulating portion 517 Eighth insulating portion 518 Second insulating member 52 The third insulating member 53 The first insulating region 531 The second insulating region 532 First spacer 61 First isolation portion 611 The second isolation portion 612 The second spacer 62 The third isolation part 621 Fourth isolation portion 622 Fifth isolation portion 623 The third spacer 63 Sixth isolation part 631 Seventh isolation section 632 First direction X Second direction Y The third direction Z.

[0050] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0052] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally arranged element at the same time. When an element is considered to be "set" on another element, it may be directly set on the other element or there may be a centrally arranged element at the same time. It should be understood that, considering the factors of actual processing tolerances, in the technical solution of the present application, when two elements are set parallel / vertically and in the same direction, there may be a certain angle between the two elements, and the angle between the two elements is allowed to have a tolerance of 0-±10%.

[0053] When a value is considered to be "equal" to another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be roughly equal. When a value is considered to be in a "1:1" ratio with another value, it means that the two are equal within the set deviation, and the set deviation range is within 10%. In other words, when at least one of the two values ​​fluctuates within the set deviation range, even if their values ​​are not equal, they are still judged to be equal in ratio.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items. The term "overlap" used herein refers to the overlap of the projections of two parts or the overlap of the projections of two parts.

[0055] One embodiment of the present application provides a battery, the battery includes a battery cell, a circuit board assembly, a transfer tab and a protective plate. The battery cell includes an electrode assembly and a packaging bag. The packaging bag includes a main body and a packaging part, the electrode assembly is arranged in the main body, the main body includes a top wall, a first concave wall and a first side wall, and when viewed along the first direction, the first side wall and the top wall are spaced apart along the second direction and the third direction, and 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 packaging part includes a top seal part, a side seal part and a corner seal part, the top seal part is connected to the top wall, the side seal part is connected to the first side wall, the corner seal part is connected to the first concave wall, the side seal part and the top seal part, and the corner seal part, the first concave wall, the side seal part and the top seal part form a first accommodating space. The circuit board assembly includes a substrate, and the substrate is arranged on the top wall. One end of the transfer tab is electrically connected to the electrode assembly, and the other end of the transfer tab extends from the corner seal part and is electrically connected to the substrate. The protective member connects the top wall and the first concave wall, covers the top sealing portion, the corner sealing portion, the transfer tab and the substrate, and part of the protective member is located in the first accommodating space.

[0056] In the above-mentioned battery, the protective member connects the top wall and the first concave wall, and the first concave wall can increase the connection area of ​​the protective member at the corner of the battery cell, thereby improving the connection stability between the protective member and the battery cell. The protective member covers the adapter lug so that when the width of the adapter lug is small, the risk of the adapter lug breaking can be reduced, and the connection strength between the adapter lug and the substrate can be improved. The protective member also covers the top seal, the corner seal, and the substrate, which can strengthen the connection strength between the components, and can also reduce the risk of damage to the top seal, the corner seal, the adapter lug, and the substrate when the battery is subjected to a drop test or mechanical abuse, thereby improving the reliability of the battery.

[0057] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0058] Example 1 Please also read Figure 1 , Figure 2 and Figure 5 One embodiment of the present application provides a battery 100A, which includes a battery cell 10, a circuit board assembly 20, a transfer tab 30, and a protective member 40. The battery 100A may be, but is not limited to, a secondary battery, which refers to a battery that can be used continuously by activating active materials by charging after the battery is discharged.

[0059] 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 packaging film by punching, folding and heat sealing. The packaging bag 12 includes a main body 13 and a packaging part 14. The main body 13 is a part where the packaging bag 12 is provided with punching, and the packaging part 14 is a part where the packaging film overlaps and joins. The electrode assembly 11 is arranged in the main body 13. The main body 13 includes a top wall 131, a first concave wall 132 and a first side wall 133. When 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, and the first concave wall 132 connects the first side wall 133 and the top wall 131.

[0060] 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 .

[0061] Please also read Figure 2 and Figure 3 The packaging portion 14 includes a top seal portion 141, a side seal portion 142 and a corner seal portion 143. The top seal portion 141 is connected to the top wall 131, the side seal portion 142 is connected to the first side wall 133, the corner seal portion 143 is connected to the first concave wall 132, the side seal portion 142 and the top seal portion 141, and the corner seal portion 143, the first concave wall 132, the side seal portion 142 and the top seal portion 141 form a first accommodating space 14A, and the corner seal portion 143 is used to seal the first concave wall 132.

[0062] The circuit board assembly 20 includes a substrate 21, which is disposed on the top wall 131. The substrate 21 is used to form a protection circuit, which can provide, but is not limited to, protection functions such as overcharge, overdischarge, overcurrent, short circuit and anti-counterfeiting for the battery cell 10.

[0063] One end of the transition tab 30 is electrically connected to the electrode assembly 11 , and the other end of the transition tab 30 extends from the corner seal portion 143 and is electrically connected to the substrate 21 .

[0064] The protective member 40 connects the top wall 131 and the first concave wall 132, and the first concave wall 132 can increase the connection area of ​​the protective member 40 at the corner of the battery cell 10, thereby improving the connection stability between the protective member 40 and the battery 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 portion 141, the corner seal portion 143, the adapter tab 30 and the substrate 21, and part of the protective member 40 is located in the first accommodating space 14A. The protective member 40 covers the adapter tab 30, so that 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 member 40 also covers the top seal 141, the corner seal 143 and the substrate 21. When the battery 100A is subjected to a drop test or mechanical abuse, the risk of damage to the top seal 141, the corner seal 143, the transition tab 30 and the substrate 21 can be reduced, thereby improving the reliability of the battery 100A.

[0065] In some embodiments, the protection member 40 is formed on the top wall 131 and the first concave wall 132 by using an injection molding device to melt the injection material and then solidify it.

[0066] Optionally, the injection molding material includes at least one of polyamide, silicone resin and rubber.

[0067] Please continue reading Figure 3 In some embodiments, along the second direction Y, the width of the adapter tab 30 is L1, 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 portion 143 in the second direction Y will increase, so that the first concave wall 132 occupies a larger space in the second direction Y. By limiting 2mm≤L1≤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 at the head of the battery 100A can be reduced.

[0068] Optionally, L1 is 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or any other value satisfying the range of 2 mm ≤ L1 ≤ 4 mm.

[0069] Please continue reading Figure 2 and Figure 3In some embodiments, the protective member 40 includes a cover portion 41 and a convex portion 42. The cover portion 41 includes a first sub-cover portion 411 and a second sub-cover portion 412, and the first sub-cover portion 411 and the second sub-cover portion 412 are connected along the second direction Y. Along the 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 convex portion 42 is connected to the surface of the second sub-cover portion 412 close to the first recessed wall 132 and is at least partially located in the first accommodating space 14A, so as to facilitate connection with the first recessed wall 132. Among them, the cover portion 41 covers the substrate 21 and the top seal portion 141, the convex portion 42 covers the corner seal portion 143, and the convex portion 42 and the second sub-cover portion 412 cover the adapter tab 30.

[0070] In some embodiments, the protrusion 42 and the second sub-cover portion 412 also cover the portion where the top seal portion 141 and the corner seal portion 143 are connected, as well as the portion where the side seal portion 142 and the corner seal portion 143 are connected, so as to further improve the structural strength of the head of the battery 100A.

[0071] Please refer again Figure 1 and Figure 2 In some embodiments, the circuit board assembly 20 includes a flexible circuit board 22, the flexible circuit board 22 is connected to the substrate 21, and the flexible circuit board 22 is configured to be electrically connected to an external circuit. The protective member 40 covers the portion where the flexible circuit board 22 is connected to the substrate 21 to improve the stability of the connection between the flexible circuit board 22 and the substrate 21. The second sub-cover portion 412 is provided with a recess 412A at a corner away from the first sub-cover portion 411, and the flexible circuit board 22 extends from the recess 412A to expand the movable angle of the flexible circuit board 22.

[0072] In some embodiments, the flexible circuit board 22 includes a first connecting section 221, a second connecting section 222, a third connecting section 223, a fourth connecting section 224 and a connector 225. One end of the first connecting section 221 is connected to the surface of the substrate 21 away from the top wall 131 and is located in the protective member 40, and the other end of the first connecting section 221 extends from the recess 412A. The third connecting section 223 is located outside the protective member 40 and is arranged opposite to the first connecting section 221 along the third direction Z. The second connecting section 222 is located outside the protective member 40 and is bent and connected to the first connecting section 221 and the third connecting section 223. The fourth connecting section 224 extends from the third connecting section 223 in a direction away from the substrate 21. The connector 225 is arranged on the fourth connecting section 224, and the connector 225 is used to be electrically connected to an external circuit.

[0073] Please continue reading Figure 1 and Figure 2In some embodiments, the main body 13 includes two first side walls 133 and two first concave walls 132. The two first side walls 133 are arranged opposite to each other along the second direction Y, and the two first concave walls 132 are connected to the two ends of the top wall 131. The packaging part 14 includes two side sealing parts 142 and two corner sealing parts 143. Each side sealing part 142 is connected to a first side wall 133, and each corner sealing part 143 is connected to a first concave wall 132, a side sealing part 142 and a top sealing part 141. The battery 100A includes two adapter tabs 30. The polarities of the two adapter tabs 30 are opposite, and each adapter tab 30 extends from a corner sealing part 143. Along the second direction Y, the 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 battery cell 10, thereby further improving the connection stability between the protective member 40 and the battery cell 10. The protective member 40 covers the top sealing portion 141, the two corner sealing portions 143, the two transfer tabs 30 and the substrate 21.

[0074] 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 arranged opposite to each other along the third direction Z, and the two second side walls 135 are arranged opposite to each other along the first direction X. The top wall 131 , the bottom wall 134 , the two first side walls 133 , and the two first concave walls 132 are connected between the two second side walls 135 and enclose a space for accommodating the electrode assembly 11 .

[0075] 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 the 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.

[0076] Please refer again Figure 3 In some embodiments, the first concave wall 132 includes a first wall 132A and a second wall 132B. When viewed along the first direction X, the first wall 132A is connected to the top wall 131 and extends toward the bottom wall 134, and the second wall 132B is connected to an 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.

[0077] Optionally, the first wall 132A extends along the third direction Z, and the second wall 132B extends along the second direction Y.

[0078] In some embodiments, a chamfer extending in an arc shape is provided at the connection between the first wall 132A and the second wall 132B to reduce the risk of stress concentration at the connection between the first wall 132A and the second wall 132B.

[0079] Please continue reading Figure 3 In some embodiments, the substrate 21 and the top wall 131 are arranged opposite to each other along the third direction Z, and the top sealing portion 141 is located between the substrate 21 and the top wall 131 .

[0080] The top seal portion 141 is bent 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 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, so as to improve the packaging stability of the packaging portion 14.

[0081] In some embodiments, the side seal portion 142 is bent toward the first side wall 133 to reduce the space occupied by the side seal portion 142 in the second direction Y, which is beneficial to improve 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 side wall 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 side wall 213, and the side seal extension portion 142B is connected to the corner seal portion 143 to improve the packaging stability of the packaging portion 14.

[0082] In some embodiments, the protection member 40 covers the side seal extension portion 142B to improve the structural strength of the head of the battery 100A.

[0083] Observing along the third direction Z, the top seal extension 141B and the side seal extension 142B are arranged at intervals along the second direction Y and form a notch 14B connected to the first accommodating space 14A, and the corner seal 143 is provided with a portion of the adapter tab 30 arranged in the notch 14B, so as to facilitate the connection between the adapter tab 30 and the substrate 21. In addition, when the injection molding equipment is arranged at the corner of the battery cell 10 to perform injection molding on the head of the battery 100A, the notch 14B is conducive to the flow of the injection molding material in the first accommodating space 14A and the surface of the top wall 131, thereby improving the injection molding efficiency and the injection molding effect.

[0084] Please continue reading Figure 3 In some embodiments, the adapter tab 30 includes a first extension segment 31 and a second extension segment 32, the first extension segment 31 extends out of the corner seal portion 143 along the third direction Z, and the second extension segment 32 is connected to the first extension segment 31 and is spaced apart from the top seal extension portion 141B along the second direction Y.

[0085] In some embodiments, the corner seal portion 143 includes a first side edge 143A away from the second wall 132B along the third direction Z, and the first extension section 31 extends from the first side edge 143A along the third direction Z. The top seal extension portion 141B includes a second side edge 141B1 connected to the first side edge 143A. The side seal extension portion 142B includes a third side edge 142B1 connected to the first side edge 143A. When viewed along the third direction Z, the second extension section 32 is located between the second side edge 141B1 and the third side edge 142B1 along the second direction Y.

[0086] The protective member 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 packaging film, and there is an exposed metal layer in the cut surface, which is easy to contact with other structural parts to cause a short circuit. By covering the first side 143A, the second side 141B1 and the third side 142B1 with the protective member 40, the exposed metal layer in the cut surface can be insulated and isolated from other structural parts, reducing the risk of short circuit, thereby improving the reliability of the battery 100A.

[0087] Please also read Figure 2 and Figure 3 The circuit board assembly 20 includes a first connector 23, the first connector 23 is connected to the surface of the substrate 21 facing the second wall 132B, and the second extension section 32 is connected to the first connector 23 to shorten the connection path between the transfer tab 30 and the substrate 21. The protective member 40 covers the first connector 23 to improve the connection stability between the first connector 23 and the substrate 21 and the second extension section 32.

[0088] 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 at the corner of the battery cell 10 along the third direction Z. In addition, when the injection molding equipment is set at the corner of the battery cell 10 to perform injection molding on the head of the battery 100A, it is beneficial to reduce the risk of the injection molding equipment contacting the first connector 23 and causing a short circuit, thereby improving the reliability of the battery 100A.

[0089] 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 at the corner of the battery cell 10 along the third direction Z. In addition, when the injection molding equipment is set at the corner of the battery cell 10 to perform injection molding on the head of the battery 100A, it is beneficial to reduce the risk of the injection molding equipment contacting the adapter tab 30 and causing a short circuit, thereby improving the reliability of the battery 100A.

[0090] Please continue reading Figure 3In some embodiments, the first connector 23 includes a first section 231, a second section 232, and a third section 233. The first section 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 section 232 is disposed on the side of the second region 231B facing the second wall 132B, and the third section 233 is connected between the second region 231B and the second section 232. The second extension section 32 is disposed between the second region 231B and the second section 232 to improve the stability of the connection between the transfer tab 30 and the first connector 23. Optionally, the second section 232 is located in the first accommodating space 14A.

[0091] 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 section 232 and the second wall 132B, the second insulating portion 512 is located between the first region 231A and the top seal portion 141, and the third insulating portion 513 is located between the substrate 21 and the top seal portion 141. The first insulating portion 511 is used to improve the insulation stability between the first connector 23 and the first concave wall 132, and can 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. The second insulating portion 512 is used to improve the insulation stability between the first connector 23 and the top seal portion 141. The third insulating portion 513 is used to improve the insulation stability between the substrate 21 and the top seal portion 141.

[0092] Optionally, the first insulating member 51 is DuPont tape.

[0093] 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 portion of the side seal portion 142 extending out of the second wall 132B along the 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.

[0094] Optionally, the second insulating member 52 is a Mylar film.

[0095] Please continue reading Figure 3In some embodiments, the battery 100A includes a first isolating member 61, which includes a first isolating portion 611 and a second isolating portion 612 connected in sequence, and the first isolating portion 611 overlaps with the first wall 132A along the second direction Y to reduce the risk of the injection molding equipment damaging the first wall 132A and improve the reliability of the battery 100A. The second isolating 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.

[0096] Optionally, the first isolation member 61 is a Mylar film.

[0097] Please also read Figure 3 and Figure 4 The battery 100B includes a second isolating member 62, which includes a third isolating portion 621, a fourth isolating portion 622, and a fifth isolating portion 623 connected in sequence, the third isolating portion 621 covers the surface of the second region 231B away from the second section 232, the fourth isolating portion 622 covers the surface of the third section 233 away from the second extension section 32, and the fifth isolating portion 623 covers the surface of the first insulating portion 511 away from the second section 232. The second isolating member 62 can reduce the risk of the injection molding equipment contacting the first connector 23 and causing a short circuit, and the second isolating member 62 can also define the positional relationship between the first insulating portion 511 and the first connector 23, reduce the risk of the first insulating portion 511 deviating from the first connector 23, and thus improve the reliability of the battery 100A.

[0098] Optionally, the second isolation member 62 is a Mylar film.

[0099] See also Figure 5 , Figure 5 The top seal portion 141 and the side seal portion 142 are in an unfolded and unfolded state. In some embodiments, the electrode assembly 11 includes a pole piece group 111 and an inner pole ear 112. The pole piece group 111 includes a positive pole piece, a separator and a negative pole piece arranged in sequence. Optionally, the positive pole piece, the separator and the negative pole piece are a laminated structure. A first concave surface 111A is provided at the corner of the pole piece group 111 adjacent to the first concave wall 132, and the inner pole ear 112 extends from the first concave surface 111A. The inner pole ear 112 is connected to the transfer pole ear 30 (i.e., the first extension section 31) and forms a joint portion 112A so that the transfer pole ear 30 is electrically connected to the electrode assembly 11. The joint portion 112A is located between the first concave surface 111A and the first concave wall 132, so that the joint portion 112A and the pole piece group 111 share the space in the third direction Z, which is conducive to improving the energy density of the battery 100A.

[0100] In some embodiments, the first concave wall 132, the first concave surface 111A, the first side wall 133 and the second side wall 135 are enclosed together to form a space for accommodating the joint portion 112A. Along the first direction X, the portion where the second side wall 135 overlaps with the joint portion 112A is a suspended side wall, and the portion where the second side wall 135 overlaps with the pole piece group 111 is a body side wall. Since the suspended side wall corresponds to the space for accommodating the joint portion 112A, and its interior is hollow, the suspended side wall may present an irregular concave and convex surface due to collision, and the body side wall overlaps with the pole piece group 111, so the body side wall generally presents a regular plane. In some embodiments, the suspended side wall may also present a regular plane like the body side wall.

[0101] Optionally, the joint portion 112A is a weld mark formed by welding the inner electrode tab 112 and the transition electrode tab 30 .

[0102] 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 the second direction Y, and the second surface 111A2 and the second wall 132B are arranged along the third direction Z. The inner tab 112 extends from the first surface 111A1 or the second surface 111A2. A space for accommodating the coupling portion 112A is formed between the second surface 111A2 and the second wall 132B.

[0103] 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 by the second wall 132B, the second surface 111A2, and the suspended side wall is a rectangle to accommodate the joint portion 112A. Optionally, the joint portion 112A is parallel to or inclined relative to the second surface 111A2.

[0104] It can be understood that, 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 inclined relative to the second surface 111A2, and the projection of the space formed between the second wall 132B, the second surface 111A2, and the suspended side wall is a triangle. The joint portion 112A is tilted in the space formed between the second wall 132B and the second surface 111A2, and the tilt angle of the joint portion 112A is substantially the same as the tilt angle of the second wall 132B, so as to reduce the stress on the joint portion 112A due to excessive bending.

[0105] In some embodiments, when viewed along the first direction X, the area where the first surface 111A1 is separated from the first wall 132A protrudes toward the joint portion 112A, so as to increase the capacity of the electrode assembly 111 .

[0106] Example 2 See also Figure 6 One embodiment of the present application further provides a battery 100B. The battery 100B is different from the battery 100A in that the structures of the first connecting member 23, the adapter tab 30 and the first insulating member 51 are different.

[0107] Please also read Figure 7 and Figure 8 , the first connector 23 includes a fourth section 234, a fifth section 235 and a sixth section 236. Along the third direction Z, the fourth section 234 overlaps with the substrate 21, and the fifth section 235 overlaps with the second wall 132B. The sixth section 236 is connected between the fourth section 234 and the fifth section 235, and along the second direction Y, the sixth section 236 overlaps with the first wall 132A. The first accommodating space 14A accommodates the fifth section 235 and the sixth section 236 to reduce the space occupied by the first connector 23 at the corner of the battery cell 10 along the third direction Z, and when the injection molding equipment is set at the corner of the battery cell 10 to perform injection molding on the head of the battery 100B, it is helpful to reduce the risk of the injection molding equipment contacting the first connector 23 and causing a short circuit, thereby improving the reliability of the battery 100B.

[0108] The second extension section 32 includes a first sub-extension section 321 and a second sub-extension section 322 connected in sequence. The first sub-extension section 321 connects the first extension section 31, the first sub-extension section 321 overlaps with the corner seal portion 143 along the first direction X, and the second sub-extension section 322 overlaps with the fifth section 235 along the third direction Z. The first accommodation space 14A accommodates the second extension section 32 to reduce the space occupied by the adapter tab 30 at the corner of the battery cell 10 along the third direction Z, and when the injection molding equipment is set at the corner of the battery cell 10 to perform injection molding on the head of the battery 100B, it is helpful to reduce the risk of the injection molding equipment contacting the adapter tab 30 and causing a short circuit, thereby improving the reliability of the battery 100B.

[0109] In some embodiments, along the third direction Z, the distance between the second sub-extension section 322 and the substrate 21 is H1, 0.2mm≤H1≤2mm, so that the second sub-extension section 322 is located in the first accommodating space 14A and the risk of interference between the second extension section 32 and the second wall 132B is reduced.

[0110] Optionally, H1 is 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.

[0111] In some embodiments, along the third direction Z, the distance between the fifth segment 235 and the substrate 21 is H2, 0.2 mm≤H2≤2 mm, 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.

[0112] Optionally, H2 is 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.

[0113] 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 section 235 and the second wall 132B, and the sixth insulating portion 516 is located between the substrate 21 and the top seal portion 141. Along the second direction Y, the fifth insulating portion 515 is located between the sixth section 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 circuit 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 seal portion 141.

[0114] See also Fig. 9 The battery 100B includes a third isolating member 63, and the third isolating member 63 includes a sixth isolating portion 631 and a seventh isolating portion 632. The sixth isolating portion 631 covers the surface of the first sub-extension segment 321 away from the top sealing portion 141, and the seventh isolating portion 632 covers the overlapping portion of the fifth segment 235 and the second sub-extension segment 322, so as to reduce the risk of short circuit caused by the injection molding equipment contacting the first connecting member 23 or the adapter tab 30, thereby improving the reliability of the battery 100B.

[0115] Optionally, the third isolation member 63 is a Mylar film.

[0116] Except for the above differences, the parameters of the battery 100B and the battery 100A are substantially the same, and reference may be made to the description of the battery 100A above.

[0117] Example 3 Please also read Fig.10One embodiment of the present application further provides a battery 100C. The battery 100C is different from the battery 100A in that the structures of the first connecting member 23, the adapter tab 30 and the first insulating member 51 are different.

[0118] Please also read Fig.11 and Fig.12 In some embodiments, the flexible circuit board 22 includes a first connecting section 221, a second connecting section 222, a third connecting section 223, a fourth connecting section 224 and a connector 225. One end of the first connecting section 221 is connected to the surface of the substrate 21 away from the top wall 131 and is located in the protective member 40, and the other end of the first connecting section 221 extends from the recess 412A. The third connecting section 223 is located outside the protective member 40 and is arranged opposite to the first connecting section 221 along the third direction Z. The second connecting section 222 is located outside the protective member 40 and is bent and connected to the first connecting section 221 and the third connecting section 223. The fourth connecting section 224 extends from the third connecting section 223 in a direction away from the substrate 21. The connector 225 is arranged on the fourth connecting section 224, and the connector 225 is used to be electrically connected to an external circuit.

[0119] Along the second direction Y, the distance between the second connecting section 222 and the corresponding first side wall 133 is W2, 0mm<W2≤3mm, so as to improve the bending mobility of the bending part of the flexible circuit board 22. In addition, when the injection molding equipment is set at the corner of the battery cell 10 to perform injection molding on the head of the battery 100B, the clamp of the injection molding equipment needs to clamp the position near the bending part of the flexible circuit board 22. By limiting 0mm<W2≤3mm, it is helpful to reserve space for the clamp of the injection molding equipment.

[0120] Optionally, W2 is one of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm and any other value satisfying the range of 0 mm<W2≤3 mm.

[0121] In some embodiments, along the second direction Y, the distance between the substrate 21 and the corresponding first side wall 133 is W3, 3.5mm≤W3≤7.5mm, so that the bending part of the flexible circuit board 22 is located outside the substrate 21, so as to improve the bending mobility of the bending part of the flexible circuit board 22.

[0122] Optionally, W3 is 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or any other value satisfying the range of 0 mm<W2≤3 mm.

[0123] Please also read Fig.11 and Fig.12, along the second direction Y, the spacing between the first extension section 31 and the corresponding first side wall 133 is W1, 4mm≤W1≤8mm. When W1 is too small (less than 4mm), it is easy for the second extension section 32 to approach the corner of the battery cell 10, resulting in the second extension section 32 being located outside the substrate 21. When the injection molding equipment is set at the corner of the battery cell 10 to perform injection molding on the head of the battery 100C, the injection molding equipment is easy to contact the second extension section 32 and cause 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, so that the second extension section 32 is located on the side of the substrate 21 close to the second wall 132B, under the shielding effect of the substrate 21, it is beneficial to reduce the risk of the injection molding equipment contacting the second extension section 32 and causing a short circuit, improve the reliability of the battery 100C, and help reduce the loss of the energy density of the battery 100C.

[0124] Optionally, W1 is 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, and any other value satisfying the range of 4 mm ≤ W1 ≤ 8 mm.

[0125] The first connecting member 23 is a "U"-shaped connecting piece, and the first connecting member 23 includes a seventh section 237, an eighth section 238, and a ninth section 239. Along the third direction Z, the seventh section 237 overlaps with the substrate 21, the eighth section 238 is arranged on the side of the seventh section 237 facing the second wall 132B, and the ninth section 239 is connected between the seventh section 237 and the eighth section 238. The second extension section 32 includes an overlapping section 32A arranged between the seventh section 237 and the eighth section 238 to improve the stability of the connection between the adapter tab 30 and the first connecting member 23.

[0126] Observing along the third direction Z, the seventh section 237, the eighth section 238 and the overlapping section 32A are all located inside the substrate 21, so that under the shielding effect of the substrate 21, the risk of short circuit caused by the injection molding equipment contacting the first connecting member 23 or the adapter tab 30 is reduced, thereby improving the reliability of the battery 100C.

[0127] In some embodiments, when viewed along the second direction Y, the second extension section 32 is bent in a “U” shape around the eighth section 238 to further improve the stability of the connection between the adapter tab 30 and the first connector 23 .

[0128] Please continue reading Fig.11 and Fig.12In some embodiments, the first insulating member 51 includes a seventh insulating portion 517 and an eighth insulating portion 518, wherein 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 seal portion 141. When 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 concave 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 seal portion 141.

[0129] In some embodiments, the second insulating member 52 is integrally formed with the first isolating member 61 .

[0130] Except for the above differences, the parameters of the battery 100C and the battery 100A are substantially the same, and reference may be made to the description of the above battery 100A.

[0131] Example 4 See also Fig.13 One embodiment of the present application further provides a battery 100D. The battery 100D differs from the battery 100A in that the structures of the first concave wall 132 and the adapter tab 30 are different, and the first connector 23 is replaced by the second connector 24.

[0132] Please also read Fig.14 and Fig.15 The first concave wall 132 includes a third wall 132C. When 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, 110°≤α≤150°. The corner seal portion 143 includes a first side edge 143A parallel to the third wall 132C, and the adapter tab 30 extends from the first side edge 143A.

[0133] Optionally, α is one of 110°, 120°, 130°, 140°, 150° and any other value satisfying the range of 110°≤α≤150°.

[0134] The top seal portion 141 is bent toward the top wall 131, and 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 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 edge 143A along the second direction Y to improve the packaging stability of the packaging portion 14.

[0135] The side seal portion 142 is bent toward the first side wall 133, and 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 side wall 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 side wall 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 side edge 143A along the second direction Y to improve the packaging stability of the packaging portion 14.

[0136] Please continue reading Fig.14 and Fig.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, and the adapter tab 30 is connected to the second connector 24 to shorten the connection path between the adapter tab 30 and the substrate 21. The 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.

[0137] 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 portion 241, a second portion 242 and a third portion 243. Along the third direction Z, the first portion 241 overlaps with the substrate 21. Along the first direction X, the second portion 242 overlaps with the portion of the adapter tab 30 extending from the first side 143A. The third portion 243 is connected between the first portion 241 and the second portion 242. The first accommodation space 14A accommodates the second portion 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 battery cell 10 along the third direction Z. When the injection molding equipment is set at the corner of the battery cell 10 to perform injection molding on the head of the battery 100D, it is beneficial to reduce the risk of the injection molding equipment contacting the second connector 24 or the adapter tab 30 and causing a short circuit, thereby improving the reliability of the battery 100D.

[0138] 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 .

[0139] See also Fig.16 In some embodiments, the battery 100D includes a third insulating member 53, and the third insulating member 53 includes a first insulating area 531 and a second insulating area 532. Along the first direction X, the first insulating area 531 covers at least one side of the overlapping portion of the adapter tab 30 and the second connector 24, and the second insulating area 532 covers the portion of the second connector 24 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, thereby improving the reliability of the battery 100D.

[0140] Optionally, the third insulating member 53 is a Mylar film.

[0141] See also Fig.17 , Fig.17 The top seal portion 141 and the side seal portion 142 are in an unfolded and unfolded state. In some embodiments, a first concave surface 111A is provided at a corner of the pole piece group 111 adjacent to the first concave wall 132, the first concave surface 111A is arranged in parallel with the third wall 132C, and the inner pole ear 112 extends from the first concave surface 111A. The inner pole ear 112 is connected to the transition pole ear 30 (i.e., the first extension section 31) and forms a joint portion 112A so that the transition pole ear 30 is electrically connected to the electrode assembly 11. The joint portion 112A is located between the first concave surface 111A and the first concave wall 132, so that the joint portion 112A and the pole piece group 111 share the space in the third direction Z, which is beneficial to improve the energy density of the battery 100D. The first concave surface 111A is arranged in parallel with the third wall 132C.

[0142] Except for the above differences, the parameters of the battery 100D are substantially the same as those of the battery 100A, and reference may be made to the description of the battery 100A.

[0143] Example 5 Please also read Fig.18 and Fig.19 One embodiment of the present application further provides a battery 100E. The difference between the battery 100E and the battery 100D lies in the different structures of the second connecting member 24 and the adapter tab 30.

[0144] 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 seal extension portion 141B along the second direction Y.

[0145] The second connector 24 includes a fourth portion 244, a fifth portion 245 and a sixth portion 246. The fourth portion 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, the fourth region 244B overlaps with the third wall 132C, the fifth portion 245 is disposed on the side of the fourth region 244B facing the third wall 132C, and the sixth portion 246 is connected between the fourth region 244B and the fifth portion 245. The fourth extension section 34 is disposed between the fourth region 244B and the fifth portion 245 to improve the stability of the connection between the transfer tab 30 and the second connector 24. Optionally, the fifth portion 245 is located in the first accommodating space 14A.

[0146] Except for the above differences, the parameters of the battery 100E and the battery 100D are substantially the same, and reference may be made to the description of the battery 100D.

[0147] Example 6 Please also read Fig. 20One embodiment of the present application further provides a battery 100F. The difference between the battery 100F and the battery 100C is that the position of the adapter tab 30 relative to the first concave wall 130 is different.

[0148] Please also read Fig.21 and Fig. 22 The packaging bag 12 includes a main body 13 and a packaging part 14. The main body 13 is a part of the packaging bag 12 where a punch hole is provided. The electrode assembly 11 is disposed in the main body 13. The main body 13 includes a top wall 131, a first concave wall 132 and a first side wall 133. When viewed along the first direction X, the first side wall 133 is spaced apart from the top wall 131 along the second direction Y and the third direction Z, and the first concave wall 132 connects the first side wall 133 and the top wall 131.

[0149] The packaging portion 14 includes a top sealing portion 141, a side sealing portion 142 and a corner sealing portion 143. The top sealing portion 141 is connected to the top wall 131, the side sealing portion 142 is connected to the first side wall 133, the corner sealing portion 143 is connected to the first recessed wall 132, the side sealing portion 142 and the top sealing portion 141 to form a first accommodating space 14A, and the corner sealing portion 143 is used to seal the first recessed wall 132.

[0150] The top seal portion 141 is bent 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 packaging stability of the packaging portion 14.

[0151] The circuit board assembly 20 includes a substrate 21, which is disposed on the top wall 131. One end of the transfer tab 30 is electrically connected to the electrode assembly 11, and the other end of the transfer tab 30 extends from the top seal portion 141 and is electrically connected to the substrate 21. Specifically, the other end of the transfer tab 30 extends from the top seal body portion 141A.

[0152] The protective member 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 member 40 at the corner of the battery cell 10, thereby improving the connection stability between the protective member 40 and the battery cell 10. The protective member 40 covers the top seal 141, the corner seal 143, the adapter tab 30 and the substrate 21. The protective member 40 is used to improve the structural strength of the head of the battery 100F. When the battery 100F undergoes a drop test or is subjected to mechanical abuse, the risk of damage to the top seal 141, the corner seal 143, the adapter tab 30 and the substrate 21 can be reduced, thereby improving the reliability of the battery 100F. The other end of the adapter tab 30 extends from the top seal 141 and is electrically connected to the substrate 21, so that the adapter tab 30 is away from the corner of the battery cell 10 along the second direction Y, which is conducive to reducing the risk of the injection molding equipment contacting the adapter tab 30 and causing a short circuit.

[0153] In some embodiments, the first connecting member 23 is a "U"-shaped connecting piece. Along the third direction Z, the first connecting member 23 overlaps with the substrate 21. Under the cover of the substrate 21, it is beneficial to reduce the risk of short circuit caused by the injection molding equipment contacting the first connecting member 23, thereby improving the reliability of the battery 100F.

[0154] Except for the above differences, the parameters of the battery 100F and the battery 100C are substantially the same, and reference may be made to the description of the battery 100C above.

[0155] Example 7 See also Fig.23 An embodiment of the present application further provides a terminal device 200A, comprising the battery (100A, 100B, 100C, 100D, 100E, 100F) in any of the above embodiments.

[0156] Optionally, the terminal device 200 can be a mobile phone, a tablet computer, a laptop computer, a smart wearable product (e.g., a smart watch, a smart bracelet), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or other device with a rechargeable battery.

[0157] In summary, in the above-mentioned batteries (100A, 100B, 100C, 100D, 100E, 100F) and the terminal device 200, the protective member 40 connects the top wall 131 and the first recessed wall 132, and the first recessed wall 132 can increase the connection area of ​​the protective member 40 at the corner of the battery cell 10, thereby improving the connection stability between the protective member 40 and the battery cell 10. The protective member 40 covers the top seal portion 141, the corner seal portion 143, the adapter tab 30 and the substrate 21. The protective member 40 is used to improve the structural strength of the head of the battery (100A, 100B, 100C, 100D, 100E, 100F). When the battery (100A, 100B, 100C, 100D, 100E, 100F) is subjected to a drop test or mechanical abuse, the risk of damage to the top seal portion 141, the corner seal portion 143, the adapter tab 30 and the substrate 21 can be reduced, thereby improving the reliability of the battery (100A, 100B, 100C, 100D, 100E, 100F).

[0158] In addition, those skilled in the art may also make other changes within the spirit of the present application. Of course, these changes made according to the spirit of the present application should be included in the scope disclosed in the present application.

Claims

1. A battery, characterized in that: The battery comprises: A battery cell, the battery cell comprising: Electrode assembly; A packaging bag, the packaging bag comprising a main body and a packaging part, the electrode assembly is arranged in the main body, the main body comprising a top wall, a first concave wall and a first side wall, observed 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 a thickness direction of the battery cell, the first direction, the second direction and the third direction are perpendicular to each other, the packaging part comprises a top sealing part, a side sealing part and a corner sealing part, the top sealing part is connected to the top wall, the side sealing part is connected to the first side wall, the corner sealing part is connected to the first concave wall, the side sealing part and the top sealing part, and a first accommodating space is formed between the corner sealing part, the first concave wall, the side sealing part and the top sealing part; A circuit board assembly, the circuit board assembly comprising a substrate, the substrate being disposed on the top wall; A transfer tab, one end of which is electrically connected to the electrode assembly, and the other end of which extends from the corner seal portion and is electrically connected to the substrate; A protective member is connected to the top wall and the first concave wall, the protective member covers the top sealing portion, the corner sealing portion, the transfer tab and the substrate, and a portion of the protective member is located in the first accommodating space.

2. The battery according to claim 1, characterized in that Along the second direction, the width of the switching tab is L1, 2mm≤L1≤4mm.

3. The battery according to claim 1, characterized in that The protective member includes a cover portion and a convex portion, the cover portion includes a first sub-cover portion and a second sub-cover portion, the first sub-cover portion and the second sub-cover portion are connected along the second direction, along the third direction, the first sub-cover portion overlaps with the top wall, the second sub-cover portion overlaps with the first concave wall, the convex portion is connected to the surface of the second sub-cover portion close to the first concave wall, and at least part of the convex portion is located in the first accommodating space.

4. The battery according to claim 3, characterized in that The circuit board assembly includes a flexible circuit board, and the flexible circuit board is connected to the substrate; The protective member covers the portion where the flexible circuit board is connected to the substrate, and a recess is provided at a corner of the second sub-cover portion away from the first sub-cover portion, and the flexible circuit board extends out of the recess.

5. The battery according to claim 1, characterized in that The main body portion includes two first side walls and two first concave walls, the two first side walls are arranged opposite to each other along the second direction, the two first concave walls are connected to two ends of the top wall, the packaging portion includes two side sealing portions and two corner sealing portions, each of the side sealing portions is connected to one of the first side walls, and each of the corner sealing portions is connected to one of the first concave walls, one of the side sealing portions and the top sealing portion; The battery comprises two adapter tabs, each of which extends from one of the corner seals; The protective member connects the top wall and the two first concave walls, and the protective member covers the top sealing portion, the two corner sealing portions, the two transfer tabs and the substrate.

6. The battery according to claim 5, characterized in that The main body comprises a bottom wall, and the top wall and the bottom wall are arranged opposite to 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. The second wall is connected to an end of the first wall away from the top wall and extends toward the corresponding first side wall.

7. The battery according to claim 6, characterized in that The top seal portion is bent toward the top wall, and includes a top seal body component and a top seal extension portion. Along the third direction, the top seal body portion overlaps with the top wall, the top seal extension portion overlaps with the second wall, the top seal body portion is connected to the top wall, and the top seal extension portion is connected to the corner seal portion.

8. The battery according to claim 7, characterized in that The adapter tab comprises a first extension section and a second extension section, the first extension section extends out of the corner seal portion along the third direction, and the second extension section is connected 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 connecting member, the first connecting member is connected to a surface of the substrate close to the second wall, the second extension section is connected to the first connecting member, and the protective member covers the first connecting member.

9. The battery according to claim 8, characterized in that The first connecting member includes a first section, a second section and a third section, the first section includes a first area and a second area, along the third direction, the first area overlaps with the substrate, the second area overlaps with the second wall, the second section is arranged on a side of the second area close to the second wall, the third section is connected between the second area and the second section, and the second extension section is arranged between the second area and the second section; 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 section 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.

10. The battery according to claim 9, characterized in that The battery includes a second insulating member, and the second insulating member covers the corner seal portion and a portion of the side seal portion extending out of the second wall along the third direction.

11. The battery according to claim 8, characterized in that The first connecting member includes a fourth section, a fifth section and a sixth section, wherein along the third direction, the fourth section overlaps with the base plate, the fifth section overlaps with the second wall, the sixth section is connected between the fourth section and the fifth section, and along the second direction, the sixth section 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, and 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 section and the substrate is H1, 0.2 mm≤H1≤2 mm, and the distance between the fifth section and the substrate is H2, 0.2 mm≤H2≤2 mm.

12. The battery according to claim 8, characterized in that The first connecting member includes a seventh segment, an eighth segment and a ninth segment, wherein along the third direction, the seventh segment overlaps with the base plate, the eighth segment is disposed on a side of the seventh segment facing the second wall, and the ninth segment is connected between the seventh segment and the eighth segment; The second extending section includes an overlapping section disposed between the seventh section and the eighth section, and when viewed along the third direction, the seventh section, the eighth section and the overlapping section are all located within the substrate.

13. The battery according to claim 5, characterized in that The first concave wall includes a third wall, and when viewed along the first direction, the third wall is inclined relative to the top wall and the first side wall, and the included angle between the third wall and the top wall is α, 110°≤α≤150°, the corner seal portion includes a first side edge parallel to the third wall, and the adapter tab extends from the first side edge; The top seal portion is bent toward the top wall, and includes a top seal body portion and a top seal extension portion. Along the third direction, the top seal body portion overlaps with the top wall, and the top seal extension portion overlaps with the third wall. The top seal body portion is connected to the top wall, and the top seal extension portion is connected to the corner seal portion and is located at one side of the first side along the second direction; The circuit board assembly includes a second connecting member, the second connecting member is connected to a side of the substrate facing the third wall, the transfer tab is connected to the second connecting member, and the protective member covers the second connecting member.

14. The battery according to claim 13, characterized in that The transfer tab extends from the first side along a direction perpendicular to the third wall; The second connecting member includes a first portion, a second portion and a third portion, the first portion overlaps with the substrate along the third direction, the portion of the transfer tab extending from the first side overlaps with the second portion along the first direction, and the third portion is connected between the first portion and the second portion.

15. The battery according to claim 13, characterized in that The adapter tab comprises 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 seal extension portion along the second direction; The second connecting member includes a fourth portion, a fifth portion and a sixth portion, the fourth portion includes a third region and a fourth region, along the third direction, the third region overlaps with the substrate, the fourth region overlaps with the third wall, the fifth portion is disposed on a side of the fourth region facing the third wall, and the sixth portion is connected between the fourth region and the fifth portion; The fourth extension section is disposed between the fourth region and the fifth portion.

16. The battery according to claim 13, 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 switching tab and the second connector, and the second insulating region covers the portion of the second connector outside the substrate.

17. The battery according to claim 1, characterized in that The side seal portion is bent toward the first side wall, the side seal portion includes a side seal body portion and a side seal extension portion, along the second direction, the side seal body portion overlaps with the first side wall, the side seal extension portion overlaps with the first concave wall, the side seal body portion is connected to the first side wall, and the side seal extension portion is connected to the corner seal portion; The protection member covers the side seal extension portion.

18. The battery according to claim 1, characterized in that The electrode assembly includes a pole piece group and an inner pole ear. The pole piece group is provided with a first concave surface at a corner adjacent to the first concave wall. The inner pole ear extends from the first concave surface. The inner pole ear is connected to the transfer pole ear to form a joint portion, and the joint portion is located between the first concave surface and the first concave wall.

19. A battery, characterized in that: The battery comprises: A battery cell, the battery cell comprising: Electrode assembly; A packaging bag, the packaging bag comprising a main body and a packaging part, the electrode assembly is arranged in the main body, the main body comprising a top wall, a first concave wall and a first side wall, observed 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 a thickness direction of the battery cell, the first direction, the second direction and the third direction are perpendicular to each other, the packaging part comprises a top sealing part, a side sealing part and a corner sealing part, the top sealing part is connected to the top wall, the side sealing part is connected to the first side wall, the corner sealing part is connected to the first concave wall, the side sealing part and the top sealing part to form a first accommodating space, the side sealing part and the top sealing part are spaced apart; A circuit board assembly, the circuit board assembly comprising a substrate, the substrate being disposed on the top wall; A transfer tab, one end of which is electrically connected to the electrode assembly, and the other end of which extends from the top seal portion and is electrically connected to the substrate; A protective member is provided, wherein the protective member connects the top wall and the first concave wall, and the protective member covers the top sealing portion, the corner sealing portion, the transfer tab and the substrate.

20. A terminal device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 19.

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