Battery and terminal device

Abstract

The invention discloses a battery and a terminal device. The battery comprises a battery cell, a circuit board assembly and an adapter tab, the battery cell comprises an electrode assembly and a packaging bag. The electrode assembly comprises a pole piece group and an inner tab. The pole piece group comprises a first end face, a first side face and a first concave face, and the electrode assembly is contained in the packaging bag. The packaging bag comprises a main body part, a first sealing part and a packaging part. The main body part comprises a top wall and a first side wall, the top wall and the first end face are oppositely arranged, and the first side wall and the first side face are oppositely arranged. The first sealing part is connected between the top wall and the first side wall. And the inner tab is positioned in the first sealing part. The packaging part comprises a top sealing edge, a first side sealing edge and a first corner sealing edge. The circuit board assembly is arranged on the top wall. One end of the switching tab is located in the first sealing part and connected with the inner tab, and the other end of the switching tab extends out of the first corner sealing edge and is electrically connected to the circuit board assembly. And the part of the first corner sealing edge for sealing the transfer tab extends along a fourth direction. The battery is favorable for improving the energy density.

Description

Battery and terminal device TECHNICAL FIELD

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

[0002] In the existing battery structure, the inner tab extends from the end face of the tab group. A large space is required between the end face of the tab group of the tab cell and the packaging bag to accommodate the connection part of the inner tab and the adapter tab, which results in space waste and affects the energy density of the battery. In addition, the part of the packaging bag sealing the adapter tab usually needs to be bent to fit the head space of the battery, and the bent part of the packaging bag is prone to poor sealing, affecting the safety of the battery.

[0003] SUMMARY

[0004] In view of the above situation, the present application provides a battery which is beneficial to improve the energy density and safety.

[0005] The embodiment of the present application provides a battery, which comprises a cell, a circuit board assembly and an adapter tab. The cell comprises an electrode assembly and a packaging bag. The electrode assembly comprises a tab group and an inner tab. The tab group comprises a first end face, a first side face and a first concave face. The first end face and the first side face are arranged in a second direction and a third direction, respectively, and the first concave face is connected between the first end face and the first side face. The first direction is the thickness direction of the cell, and the first direction, the second direction and the third direction are perpendicular to each other. The electrode assembly is accommodated in the packaging bag. The packaging bag comprises a main body part, a first sealing part and an encapsulation part. The main body part comprises a top wall and a first side wall, and the top wall and the first end face are arranged opposite to each other, and the first side wall and the first side face are arranged opposite to each other. The first sealing part is connected between the top wall and the first side wall, and the projection of the first sealing part is located between the top wall and the first side wall in the second direction, and the projection of the first sealing part is located between the top wall and the first side wall in the third direction. The inner tab is located in the first sealing part. The encapsulation part comprises a top sealing edge, a first side sealing edge and a first corner sealing edge, the top sealing edge is connected to the top wall, the first side sealing edge is connected to the first side wall, and the first corner sealing edge is connected to the first sealing part, the top sealing edge and the first side sealing edge. The circuit board assembly is arranged on the top wall. One end of the adapter tab is located in the first sealing part and connected to the inner tab, and the other end of the adapter tab extends from the first corner sealing edge and is electrically connected to the circuit board assembly. The part of the first corner sealing edge sealing the adapter tab extends in a fourth direction, and the included angle β between the fourth direction and the first direction satisfies: 60°≤β≤120°.

[0006] In the battery, the first concave surface is connected between the first end surface and the first side surface, the top wall is opposite to the first end surface, the first side wall is opposite to the first side surface, and the first sealing portion is connected between the top wall and the first side wall, so that the first sealing portion is located at a corner of the packaging bag. By connecting one end of the adapter tab to the inner tab in the first sealing portion, the connection between the inner tab and the adapter tab is located at the corner of the packaging bag, which is conducive to the connection between the inner tab and the adapter tab sharing the space in the third direction with the tab group, thereby improving the energy density of the battery. The part of the adapter tab sealed by the first corner sealing edge extends in the fourth direction, and the included angle β between the fourth direction and the first direction satisfies: 60°≤β≤120°, so as to reduce the risk of poor sealing of the part of the adapter tab sealed by the first corner sealing edge due to excessive bending, thereby improving the safety of the battery.

[0007] In some embodiments of the application, 80°≤β≤110°, so as to further reduce the risk of poor sealing of the part of the adapter tab sealed by the first corner sealing edge due to excessive bending, thereby improving the safety of the battery.

[0008] In some embodiments of the application, as viewed in the first direction, the first concave surface includes a first inner surface and a second inner surface connected to the first inner surface, the first inner surface is connected to the first side surface and extends in the second direction, and the second inner surface is connected to the first end surface and extends in the third direction. The first sealing portion includes a first wall and a second wall, the second wall is connected to the first side wall and is spaced apart from the second inner surface in the second direction, and the first wall is connected between the second wall and the top wall. The space for accommodating the inner tab and the adapter tab is formed between the first wall and the second wall. The first corner sealing edge includes a first part and a second part spaced apart, the first part is connected to the first wall and the top sealing edge, and the second part is connected to the second wall and the first side sealing edge. The adapter tab extends out of the packaging bag from the first part, so as to facilitate electrical connection between the adapter tab and the circuit board assembly arranged on the top wall.

[0009] In some embodiments of the application, the first wall comprises a first side edge away from the first inner surface in the third direction, the first side edge extends along the second direction, and the first side edge and the top wall are spaced apart along the third direction as viewed along the second direction. The first portion comprises a first sub-portion and a second sub-portion, the first sub-portion is connected to the first side edge, the first sub-portion is located between the first side edge and the top wall in the third direction, the first sub-portion is located between the second portion and the top wall in the second direction, and the second sub-portion is connected to the first sub-portion and the top seal edge. The top seal edge is bent towards the top wall, the top seal edge is located between the circuit board assembly and the top wall, the top seal edge and the top wall are oppositely arranged along the third direction, the first sub-portion extends along the third direction, and the second sub-portion is bent towards the same direction as the top seal edge. The adapter tab protrudes from the part of the first sub-portion away from the second sub-portion to the packaging bag. The part of the first portion sealing the adapter tab and the adapter tab located in the first portion do not need to be bent synchronously with the top seal edge, thereby reducing the risk of poor sealing of the part of the first corner seal edge sealing the adapter tab due to bending, and reducing the risk of damage to the tab adhesive located in the first corner seal edge due to bending, improving the stability of the adapter tab and the first corner seal edge, and thereby improving the safety of the battery.

[0010] In some embodiments of the application, the tab group further comprises a second concave surface connected between the first end surface and the second inner surface. The first sub-portion extends towards the second concave surface along the third direction, and the projection of the second sub-portion and the projection of the second concave surface overlap, so as to increase the length of the part of the first sub-portion away from the second sub-portion in the second direction, and reduce the risk of interference between the second sub-portion and the adapter tab and the tab adhesive located in the first sub-portion.

[0011] In some embodiments of the application, the adapter tab comprises a first extension segment and a second extension segment, the first extension segment protrudes from the first sub-portion to the packaging bag along the third direction, the second extension segment is connected to one end of the first extension segment away from the first sub-portion, and the second extension segment is bent towards the same direction as the top seal edge. The battery cell further comprises a tab adhesive, the tab adhesive comprises a first sub-adhesive and a second sub-adhesive, the first sub-adhesive is located in the first sub-portion and covers the first extension segment, and the second sub-adhesive protrudes from the first sub-portion and covers part of the second extension segment, and the second sub-adhesive is bent towards the same direction as the second extension segment. The first sub-adhesive and the second sub-adhesive can increase the connection area of the tab adhesive and the adapter tab, thereby improving the stability of the adapter tab and the first portion sealing.

[0012] In some embodiments of the application, as viewed along the third direction, the second sub-adhesive and the second sub-portion are spaced apart along the second direction, thereby reducing the risk of interference between the second sub-portion and the adapter tab and the tab adhesive located in the first sub-portion.

[0013] In some embodiments of the present application, the circuit board assembly comprises a protection plate and a first connecting piece, the first connecting piece is connected with the protection plate and the second extension section, and the protection plate is arranged on the side of the top sealing edge away from the top wall. The first connecting piece comprises a first connecting sheet, a second connecting sheet and a third connecting sheet. The first connecting sheet is connected to the side of the protection plate facing the first part, and the first connecting sheet comprises a first region and a second region. In the third direction, the projection of the first region overlaps the projection of the second subpart, and the projection of the second region overlaps the projection of the second extension section, so as to increase the connection area of the first connecting sheet and the protection plate, and improve the structural stability and current-carrying capacity of the first connecting sheet and the protection plate. The second connecting sheet is located on the side of the second extension section away from the second region, and the third connecting sheet is connected between the second connecting sheet and the second region. The second extension section extends between the second region and the second connecting sheet, so as to improve the stability of the electrical connection between the adapter tab and the circuit board assembly.

[0014] In some embodiments of the present application, the first corner sealing edge further comprises a third part connected between the second part and the first subpart. The first side sealing edge is bent towards the first side wall, and the first side sealing edge and the first side wall are arranged opposite to each other in the second direction. The second part and the third part are bent towards the same direction as the first side sealing edge. The battery further comprises a first insulating piece and a second insulating piece. The first insulating piece is bonded to both sides of the top sealing edge in the third direction, and the first insulating piece also covers the second subpart and extends from the second subpart towards the first side edge, so as to improve the structural stability of the top sealing edge and the second subpart. The second insulating piece is bonded to both sides of the first subpart in the first direction and both sides of the third part in the second direction, so as to improve the insulation stability of the first corner sealing edge and the external environment.

[0015] In some embodiments of the present application, in the first direction, the first concave surface comprises a third inner surface connected between the first end surface and the first side surface, and the third inner surface is arranged obliquely relative to the first end surface and the first side surface. The included angle α between the third inner surface and the first end surface satisfies: 110°≤α≤150°. The first sealing part comprises a third wall, the third wall and the third inner surface are arranged opposite to each other in a direction perpendicular to the third inner surface, and a space for accommodating the inner tab and part of the adapter tab is formed between the third wall and the third inner surface. The first corner sealing edge is connected to the third wall. The connection between the inner tab and the adapter tab is located at the corner position of the packaging bag, which is conducive to the connection between the inner tab and the adapter tab sharing the space in the third direction with the pole piece group, thereby improving the energy density of the battery.

[0016] In some embodiments of the present application, the third wall comprises a second side edge away from the third inner surface in a direction perpendicular to the third inner surface. The first corner seal comprises a fourth portion, a fifth portion and a sixth portion, the fourth portion and the fifth portion are spaced apart, and the sixth portion is connected between the fourth portion and the fifth portion. The sixth portion is connected to the second side edge. The fourth portion is connected to the top seal, and a projection of the fourth portion in the third direction is within a projection of the first sealing portion. The fifth portion is connected to the first side seal, and a projection of the fifth portion in the second direction is within the projection of the first sealing portion. The adapter tab extends from the sixth portion to the packaging bag, so as to facilitate electrical connection between the adapter tab and the circuit board assembly arranged on the top wall.

[0017] In some embodiments of the present application, the top seal is bent towards the top wall, and the top seal is arranged between the circuit board assembly and the top wall. The fourth portion is bent towards the same direction as the top seal, so as to reduce the space occupied by the top seal, the circuit board assembly and the fourth portion in the third direction, improve the head space utilization of the battery, and further improve the energy density of the battery.

[0018] In some embodiments of the present application, the second side edge extends in a direction parallel to the third inner surface when viewed in the first direction, and the sixth portion extends in a direction perpendicular to the third inner surface. The adapter tab extends from the sixth portion to the packaging bag in a direction perpendicular to the third inner surface, so as to facilitate the overmolding of the adapter tab by the tab adhesive. The sixth portion and the adapter tab arranged therein do not need to be bent synchronously with the top seal or the first side seal, so as to reduce the risk of poor sealing of the portion of the first corner seal sealing the adapter tab due to bending, and reduce the risk of damage to the tab adhesive arranged in the first corner seal due to bending, improve the stability of the sealing of the adapter tab and the first corner seal, and further improve the safety of the battery.

[0019] In some embodiments of the present application, the circuit board assembly comprises a protection plate and a second connecting piece. The protection plate is arranged on a side of the top seal away from the top wall, and the protection plate and the adapter tab are spaced apart in the second direction. The second connecting piece comprises a fourth connecting sheet, a fifth connecting sheet and a sixth connecting sheet. The fourth connecting sheet is connected to the protection plate and arranged opposite to the protection plate in the third direction, so as to increase the connection area of the fourth connecting sheet and the protection plate, and improve the stability of the connection between the fourth connecting sheet and the protection plate. The fifth connecting sheet is connected to the adapter tab and arranged opposite to the adapter tab in the first direction, so as to increase the connection area of the fifth connecting sheet and the adapter tab, and improve the stability of the connection between the fifth connecting sheet and the adapter tab. The sixth connecting sheet has two ends respectively connected to the fourth connecting sheet and the fifth connecting sheet, so as to adjust the angle between the fourth connecting sheet and the fifth connecting sheet.

[0020] In some embodiments of the present application, the second side edge extends in a direction parallel to the third inner surface when viewed in the first direction, and the sixth portion extends in a direction perpendicular to the third inner surface. The adapter tab extends out of the packaging bag from the sixth portion in the third direction to shorten the extension path of the adapter tab to the circuit board assembly.

[0021] In some embodiments of the present application, the adapter tab includes a third extension segment and a fourth extension segment. The third extension segment extends out of the packaging bag from the sixth portion in the third direction when viewed in the second direction, and the fourth extension segment is bent in the same direction as the top sealing edge. The circuit board assembly includes a protection plate and a third connecting member. The protection plate is arranged on the side of the top sealing edge away from the top wall. The third connecting member includes a seventh connecting sheet, an eighth connecting sheet, and a ninth connecting sheet. The seventh connecting sheet is connected to the side of the protection plate facing the third wall. The seventh connecting sheet includes a third region and a fourth region. The projection of the third region overlaps the projection of the fourth portion in the third direction, and the projection of the fourth region overlaps the projection of the fourth extension segment to increase the connection area of the seventh connecting sheet and the protection plate, and improve the structural stability and current carrying capacity of the seventh connecting sheet and the protection plate. The eighth connecting sheet is located on the side of the fourth extension segment away from the fourth region, and the ninth connecting sheet is connected between the eighth connecting sheet and the fourth region. The fourth extension segment extends into the fourth region and the eighth connecting sheet to improve the stability of the electrical connection between the adapter tab and the circuit board assembly.

[0022] In some embodiments of the present application, the first side sealing edge is bent toward the first side wall, the first side sealing edge and the first side wall are arranged opposite to each other in the second direction, and the fifth portion is bent in the same direction as the first side sealing edge to reduce the space occupied by the first side sealing edge and the fifth portion in the second direction, and improve the energy density of the battery.

[0023] In some embodiments of the present application, the position of the inner tab in the first sealing portion extends in a direction perpendicular to the third inner surface to improve the space utilization of the inner tab in the first sealing portion.

[0024] In some embodiments of the present application, the extension direction of the inner tab is perpendicular to the first direction, and the inner tab and the adapter tab are stacked and welded in the first direction to reduce the risk of the inner tab being inserted upside down due to bending, and to improve the stability of the connection between the inner tab and the adapter tab.

[0025] Embodiments of the present application also provide a terminal device, which includes any one of the batteries in the above embodiments.

[0026] In the battery and the terminal device, the first concave surface is connected between the first end surface and the first side surface, the top wall is opposite to the first end surface, the first side wall is opposite to the first side surface, the first sealing part is connected between the top wall and the first side wall, and the first sealing part is located at a corner position of the packaging bag. One end of the adapter tab is located in the first sealing part and connected with the inner tab, so that the connection position of the inner tab and the adapter tab is located at the corner position of the packaging bag, which is beneficial to the connection position of the inner tab and the adapter tab to share the space in the third direction with the electrode group, thereby improving the energy density of the battery. The part of the adapter tab sealed by the first corner sealing edge extends in the fourth direction, and the included angle β between the fourth direction and the first direction satisfies: 60°≤β≤120°, so as to reduce the risk of poor sealing of the part of the adapter tab sealed by the first corner sealing edge due to excessive bending, thereby improving the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0027] FIG. 1 is a structural schematic diagram of a battery in an embodiment of the present application.

[0028] FIG. 2 is a partially exploded structural schematic diagram of a battery in an embodiment of the present application.

[0029] FIG. 3 is a structural schematic diagram of an electrode assembly of a battery in an embodiment of the present application.

[0030] FIG. 4 is a partial cross-sectional view of FIG. 1 along section line I-I.

[0031] FIG. 5 is a structural schematic diagram of a second sub-wall of a battery in an embodiment of the present application.

[0032] FIG. 6 is a structural schematic diagram of a first insulating piece, a second insulating piece and a third insulating piece of a battery in an embodiment of the present application.

[0033] FIG. 7 is a structural schematic diagram of a fourth insulating piece of a battery in an embodiment of the present application.

[0034] FIG. 8 is a structural schematic diagram of a second concave surface of a battery in an embodiment of the present application.

[0035] FIG. 9 is a structural schematic diagram of a battery in another embodiment of the present application.

[0036] FIG. 10 is a partially exploded structural schematic diagram of a battery in an embodiment of the present application.

[0037] FIG. 11 is a structural schematic diagram of a battery in another embodiment of the present application.

[0038] FIG. 12 is a structural schematic diagram of an electrode assembly of a battery in an embodiment of the present application.

[0039] FIG. 13 is a partially exploded structural schematic diagram of a battery in an embodiment of the present application.

[0040] FIG. 14 is a structural diagram of a third wall of a battery in one embodiment of the present application.

[0041] FIG. 15 is a structural diagram of a sixth insulating member of a battery in one embodiment of the present application.

[0042] FIG. 16 is a structural diagram of a battery in another embodiment of the present application.

[0043] FIG. 17 is a structural diagram of an electrode assembly of a battery in one embodiment of the present application.

[0044] FIG. 18 is a partially exploded structural diagram of a battery in one embodiment of the present application.

[0045] FIG. 19 is a structural diagram of a terminal device in one embodiment of the present application.

[0046] Main element symbol explanation Battery 100A, 100B, 100C, 100D Terminal device 200 Cell 1 Electrode assembly 10 Tab group 11 First end surface 111 First side surface 112 First concave surface 113 First inner surface 113A Second inner surface 113B Third inner surface 113C Second concave surface 114 Inner tab 12 Packaging bag 20 Main body part 21 Top wall 211 First side wall 212 Second side wall 213 Third side wall 214 First sealing part 22 First wall 221 First side edge 221A First edge 221B First sub wall 221C Second sub wall 221D Second wall 222 Third wall 223 Second side edge 223A Second edge 223B Third edge 223C Third sub wall 223D Fourth sub wall 223E Sealing part 23 Top sealing edge 231 First side sealing edge 232 First corner sealing edge 233 First part 233A First sub part2331 second sub-portion 2332 second portion 233B third portion 233D fourth portion 233E fifth portion 233F sixth portion 233G grommet 30 first sub-gum 31 second sub-gum 32 circuit board assembly 2 protective plate 40 base plate 41 flexible circuit board 42 first segment 421 second segment 422 third segment 423 fourth segment 424 connector 425 reinforcing plate 43 first connecting member 52 first connecting tab 521 first area 521A second area 521B second connecting tab 522 third connecting tab 523 second connecting member 53 fourth connecting tab 531 fifth connecting tab 532 sixth connecting tab 533 third connecting member 54 seventh connecting tab 541 third area 541A fourth area 541B eighth connecting tab 542 ninth connecting tab 543 fourth connecting member 55 first conductive tab 551 fifth area 551A sixth area 551B second conductive tab 552Third conductive sheet 553 Switching tab 3 First extension section 61 Second extension section 62 Third extension section 63 Fourth extension section 64 First insulating member 94 Second insulating member 95 Third insulating member 96 Fourth insulating member 97 Fifth insulating member 98 Sixth insulating member 99 First direction X Second direction Y Third direction Z Fourth direction V

[0047] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application.

[0049] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or can exist with a middle element. When an element is considered to be "arranged" in another element, it can be directly arranged in the other element or can exist with a middle element. It should be understood that considering the actual processing tolerance, when two elements are arranged in the same direction in the technical solutions of the present application, there can be a certain angle between the two elements, and the angle between the two elements is allowed to exist within 0-±10% tolerance.

[0050] When one value is considered to be "equal" to another value, it means that the two values are equal within a set deviation, and the set deviation is within 10%, that is, when at least one of the two values fluctuates within the set deviation range, even if the values are not equal, it is still determined that they are approximately equal. When one value is considered to be "1:1" to another value, it means that the two values are equal within a set deviation, and the set deviation is within 10%, that is, when at least one of the two values fluctuates within the set deviation range, even if the values are not equal, it is still determined that the proportion is equal.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "and / or" includes a set of one or more associated listed items. The use herein of the term "overlapping" means that the projection of one component overlaps the projection of another component or that the projections of two components coincide.

[0052] An embodiment of the present application provides a battery, which comprises a battery cell, a circuit board assembly and a transition tab. The battery cell comprises an electrode assembly and a packaging bag. The electrode assembly comprises a tab group and an inner tab. The tab group comprises a first end face, a first side face and a first concave face. The first end face and the first side face are spaced apart along a second direction and a third direction as viewed along a first direction. The first concave face is connected between the first end face and the first side face. 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 electrode assembly is accommodated in the packaging bag. The packaging bag comprises a main body portion, a first sealing portion and an encapsulation portion. The main body portion comprises a top wall and a first side wall. The top wall is opposite to the first end face. The first side wall is opposite to the first side face. The first sealing portion is connected between the top wall and the first side wall. The projection of the first sealing portion is located between the top wall and the first side wall along the second direction. The projection of the first sealing portion is located between the top wall and the first side wall along the third direction. The inner tab is located in the first sealing portion. The encapsulation portion comprises a top sealing edge, a first side sealing edge and a first corner sealing edge. The top sealing edge is connected to the top wall. The first side sealing edge is connected to the first side wall. The first corner sealing edge is connected to the first sealing portion, the top sealing edge and the first side sealing edge. The circuit board assembly is arranged on the top wall. One end of the transition tab is located in the first sealing portion and connected to the inner tab. The other end of the transition tab extends from the first corner sealing edge and is electrically connected to the circuit board assembly. The part of the transition tab sealed by the first corner sealing edge extends along a fourth direction. The angle β between the fourth direction and the first direction satisfies 60°≤β≤120°.

[0053] In the above battery, the first concave face is connected between the first end face and the first side face. The top wall is opposite to the first end face. The first side wall is opposite to the first side face. The first sealing portion is connected between the top wall and the first side wall. The first sealing portion is located at the corner of the packaging bag. One end of the transition tab is located in the first sealing portion and connected to the inner tab. The connection between the inner tab and the transition tab is located at the corner of the packaging bag. The connection between the inner tab and the transition tab shares the space in the third direction with the tab group, thereby improving the energy density of the battery. The part of the transition tab sealed by the first corner sealing edge extends along the fourth direction. The angle β between the fourth direction and the first direction satisfies 60°≤β≤120°, thereby reducing the risk of poor sealing of the part of the transition tab sealed by the first corner sealing edge due to excessive bending, thereby improving the safety of the battery.

[0054] Embodiment One

[0055] Please refer to FIG. 1 and FIG. 2, an embodiment of the present application provides a battery 100A, the battery 100A includes a battery cell 1, a circuit board assembly 2 and a switching tab 3. The battery 100A can be but is not limited to a secondary battery, which refers to a battery that can be activated by charging after discharging to continue to use.

[0056] Please refer to FIG. 3, the battery cell 1 includes an electrode assembly 10 and a packaging bag 20. The electrode assembly 10 includes a tab group 11 and an inner tab 12. The tab group 11 includes a positive electrode tab, a separator and a negative electrode tab arranged in sequence, and the tab group 11 is used to convert chemical energy into electrical energy. Optionally, the positive electrode tab, the separator and the negative electrode tab are in a roll structure or a winding structure, and the present application takes the stack structure as an example for description. The inner tab 12 is used to electrically connect between the tab group 11 and the switching tab 3.

[0057] The tab group 11 includes a first end surface 111, a first side surface 112 and a first concave surface 113. In the first direction X, the first end surface 111 and the first side surface 112 are spaced apart along the second direction Y and the third direction Z, and the first concave surface 113 is connected between the first end surface 111 and the first side surface 112, and the inner tab 12 extends from the first concave surface 113. Among them, the first direction X is the thickness direction of the battery cell 1, 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 1, and the third direction Z is the length direction of the battery cell 1.

[0058] Please continue to refer to FIG. 1 and FIG. 2, the packaging bag 20 is made of a packaging film by punching, folding and heat sealing. The electrode assembly 10 is accommodated in the packaging bag 20. The packaging bag 20 includes a main body part 21, a first sealing part 22 and a sealing part 23. The main body part 21 is the part of the packaging film provided with the punched pit, and the tab group 11 is arranged in the main body part 21. The main body part 21 includes a top wall 211 and a first side wall 212, and the top wall 211 and the first end surface 111 are oppositely arranged, and the first side wall 212 and the first side surface 112 are oppositely arranged.

[0059] The first sealing part 22 is connected between the top wall 211 and the first side wall 212. In the second direction Y, the projection of the first sealing part 22 is located between the top wall 211 and the first side wall 212, and in the third direction Z, the projection of the first sealing part 22 is located between the top wall 211 and the first side wall 212, so as to reduce the space waste caused by the first sealing part 22 protruding out of the top wall 211 or the first side wall 212. The inner tab 12 is located in the first sealing part 22.

[0060] The encapsulation part 23 is a part where the encapsulation film overlaps. The encapsulation part 23 includes a top sealing edge 231, a first side sealing edge 232, and a first corner sealing edge 233. The top sealing edge 231 is connected to the top wall 211, and the first side sealing edge 232 is connected to the first side wall 212. The top sealing edge 231 and the first side sealing edge 232 are used to seal the main body part 21. The first corner sealing edge 233 is connected to the first sealing part 22, the top sealing edge 231, and the first side sealing edge 232. The first corner sealing edge 233 is used to seal the first sealing part 22.

[0061] The circuit board assembly 2 is arranged on the top wall 211. One end of the adapter tab 3 is located in the first sealing part 22 and connected to the inner tab 12. The connection between the inner tab 12 and the adapter tab 3 is located in the first sealing part 22. The other end of the adapter tab 3 extends from the first corner sealing edge 233 and is electrically connected to the circuit board assembly 2. Optionally, the connection between the adapter tab 3 and the inner tab 12 is provided with a solder joint.

[0062] Please refer to FIG. 1 and FIG. 4, the part of the first corner sealing edge 233 sealing the adapter tab 3 extends along the fourth direction V, and the included angle β between the fourth direction V and the first direction X satisfies: 60°≤β≤120°, so as to reduce the risk of poor sealing of the part of the first corner sealing edge 233 sealing the adapter tab 3 due to excessive bending.

[0063] Specifically, the first corner sealing edge 233 is provided with two layers of fusion layers that are sealed and connected to each other. An opening is arranged between the two layers of fusion layers for the adapter tab 3 to extend. When the part of the first corner sealing edge 233 sealing the adapter tab 3 is excessively bent (0°≤β<60° or 120°<β≤180°), the stress released when the adapter tab 3 is bent and the bending stress of the fusion layers themselves are likely to cause the fusion layers to be damaged. By limiting 60°≤β≤120°, the risk of damage to the fusion layers when the first corner sealing edge 233 is excessively bent is reduced, and in turn, the risk of poor sealing of the part of the first corner sealing edge 233 sealing the adapter tab 3 due to excessive bending is reduced.

[0064] Optionally, β is one of 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, and any other value within the range of 60°≤β≤120°.

[0065] Further, 80°≤β≤110°, so as to further reduce the risk of poor sealing of the part of the first corner sealing edge 233 sealing the adapter tab 3 due to excessive bending.

[0066] Optionally, as viewed along the first direction X, the fourth direction V is parallel to the third direction Z, or the fourth direction V is arranged obliquely relative to the second direction Y and the third direction Z.

[0067] It should be noted that the angle β between the fourth direction V and the first direction X can be obtained by observing the width direction of the portion sealed by the first corner seal edge 233 of the adapter tab 3. For example, in the embodiment of FIG. 1, the width direction of the portion sealed by the first corner seal edge 233 of the adapter tab 3 is the second direction Y.

[0068] In the above battery 100A, the first concave surface 113 is connected between the first end surface 111 and the first side surface 112, the top wall 211 is oppositely arranged with the first end surface 111, the first side wall 212 is oppositely arranged with the first side surface 112, and the first sealing portion 22 is connected between the top wall 211 and the first side wall 212, so that the first sealing portion 22 is located at the corner position of the packaging bag 20. By connecting one end of the adapter tab 3 in the first sealing portion 22 and connecting the inner tab 12, the connection between the inner tab 12 and the adapter tab 3 is located at the corner position of the packaging bag 20, which is beneficial to the connection between the inner tab 12 and the adapter tab 3 to share the space in the third direction Z with the tab group 11, thereby improving the energy density of the battery 100A. The portion sealed by the first corner seal edge 233 of the adapter tab 3 extends along the fourth direction V, and the angle β between the fourth direction V and the first direction X satisfies: 60°≤β≤120°, so as to reduce the risk of poor sealing of the portion sealed by the first corner seal edge 233 of the adapter tab 3 due to excessive bending, thereby improving the safety of the battery 100A.

[0069] In addition, compared with the existing battery which improves the space utilization rate by excessively bending the connection between the inner tab and the adapter tab, the connection between the inner tab 12 and the adapter tab 3 is located in the first sealing portion 22, so as to reduce the stress on the connection between the inner tab 12 and the adapter tab 3, reduce the risk of tab insertion caused by unstable connection of the connection between the adapter tab 3 and the inner tab 12, and improve the safety of the battery 100A.

[0070] In some embodiments, the extension direction of the inner tab 12 is perpendicular to the first direction X, and the inner tab 12 and the adapter tab 3 are stacked and welded in the first direction X, so as to reduce the risk of tab insertion caused by bending of the inner tab, and facilitate to improve the stability of the connection between the inner tab 12 and the adapter tab 3.

[0071] Please refer to FIG. 3 and FIG. 4 together, in some embodiments, the first concave surface 113 includes a first inner surface 113A and a second inner surface 113B connected with the first inner surface 113A, as viewed along the first direction X. The first inner surface 113A is connected with the first side surface 112 and extends along the second direction Y, and the second inner surface 113B is connected with the first end surface 111 and extends along the third direction Z. The inner tab 12 extends from the first inner surface 113A or the second inner surface 113B.

[0072] The first sealing portion 22 comprises a first wall 221 and a second wall 222. The second wall 222 is connected to the first side wall 212 and is spaced apart from the second inner surface 113B in the second direction Y. The first wall 221 is connected between the second wall 222 and the top wall 211, and viewed in the second direction Y, the first wall 221 is disposed around the edge of the second wall 222, and a space for accommodating the connection between the inner tab 12 and the adapter tab 3 is formed between the first wall 221 and the second wall 222.

[0073] Optionally, the projection of the space formed between the first wall 221 and the first inner surface 113A in the second direction Y can be any one of a triangle, a trapezoid, an arc, and an irregular shape.

[0074] In some embodiments, the extension direction of the inner tab 12 is parallel to at least part of the first wall 221, and the inner tab 12 and the adapter tab 3 are stacked and welded in the thickness direction of the inner tab 12, so as to improve the space utilization in the first sealing portion 22.

[0075] Optionally, at least one of the connection between the first wall 221 and the second wall 222, and the connection between the first wall 221 and the top wall 211 is arc-shaped, so as to reduce the risk of stress concentration and tearing at the connection.

[0076] In some embodiments, the first corner sealing edge 233 comprises a first portion 233A and a second portion 233B which are spaced apart, the first portion 233A is connected to the first wall 221 and the top sealing edge 231, and the second portion 233B is connected to the second wall 222 and the first side sealing edge 232. The adapter tab 3 extends out of the packaging bag 20 from the first portion 233A, so as to facilitate the electrical connection between the adapter tab 3 and the circuit board assembly 2 disposed on the top wall 211.

[0077] Referring to FIGS. 1 and 2, in some embodiments, the first wall 221 comprises a first side edge 221A away from the first inner surface 112A in the third direction Z, the first side edge 221A extends in the second direction Y, and viewed in the second direction Y, the first side edge 221A and the top wall 211 are spaced apart in the third direction Z. The first portion 233A comprises a first sub-portion 2331 and a second sub-portion 2332, the first sub-portion 2331 is connected to the first side edge 221A, viewed in the second direction Y, the first sub-portion 2331 is located between the first side edge 221A and the top wall 211 in the third direction Z, and viewed in the third direction Z, the first sub-portion 2331 is located between the second portion 233B and the top wall 211 in the second direction Y. The second sub-portion 2332 is connected between the first sub-portion 2331 and the top sealing edge 231.

[0078] The top sealing edge 231 is bent towards the top wall 211, and the top sealing edge 231 is located between the circuit board assembly 2 and the top wall 211. The top sealing edge 231 is opposite to the top wall 211 in the third direction Z. The first sub-part 2331 extends in the third direction Z. The second sub-part 2332 is bent towards the same direction as the top sealing edge 231. The adapter tab 3 extends from the part of the first sub-part 2331 and the second sub-part 2332 that are away from each other. The part of the first part 233A that seals the adapter tab 3 and the adapter tab 3 located in the first part 233A do not need to be bent synchronously with the top sealing edge 231. This reduces the risk of poor sealing of the part of the first corner sealing edge 233 that seals the adapter tab 3 due to bending, and reduces the risk of damage to the tab adhesive located in the first corner sealing edge 233 due to bending. This improves the stability of the adapter tab 3 and the first corner sealing edge 233, and further improves the safety of the battery 100A.

[0079] Please refer to FIG. 1 and FIG. 2, in some embodiments, the main body part 21 further comprises a second side wall 213 connected to one side of the top wall 211 and the first side wall 212 in the first direction X. The top sealing edge 231 is bent towards the end of the top wall 211 adjacent to the second side wall 213. The first wall 221 further comprises a first edge 221B connected to the second side wall 213 in the third direction Z. The first edge 221B and the first side edge 221A are parallel to each other. The first wall 221 further comprises a first sub-wall 221C located between the first side edge 221A and the first edge 221B. When viewed in the second direction Y, the first sub-wall 221C is a bevel or an arc surface. The bevel is inclined relative to the second side wall 213. The axis of the arc surface extends in the second direction Y. The first sub-wall 221C is configured to adapt to the structure of the connection between the inner tab 12 and the adapter tab 3. Optionally, the extension direction of the inner tab 12 is parallel to at least part of the first sub-wall 221C to improve the space utilization in the first sealing part 22.

[0080] Please refer to FIG. 4 and FIG. 5, in some embodiments, the main body part 21 further comprises a third side wall 214 connected to the other side of the top wall 211 and the first side wall 212 in the first direction X. The first wall 221 further comprises a second sub-wall 221D located between the first side edge 221A and the third side wall 214. The second sub-wall 221D and the third side wall 214 are arranged side by side in the third direction Z, i.e. the second sub-wall 221D and the third side wall 214 are in the same plane.

[0081] Please refer to FIG. 1 and FIG. 2, in some embodiments, the first side seal 232 is bent towards the first side wall 212, the first side seal 232 and the first side wall 212 are oppositely arranged along the second direction Y, the second part 233B is bent towards the same direction as the first side seal 232, and the second part 233B and the second wall 222 are oppositely arranged along the second direction Y, so as to reduce the space occupied by the first side seal 232 and the second part 233B in the second direction Y, and improve the energy density of the battery 100A.

[0082] Please refer to FIG. 2 and FIG. 3, in some embodiments, the adapter tab 3 includes a first extension segment 61 and a second extension segment 62. The first extension segment 61 extends from the first sub-part 2331 to the packaging bag 20 along the third direction Z. The second extension segment 62 is connected to one end of the first extension segment 61 away from the first sub-part 2331, and the second extension segment 62 is bent towards the same direction as the top seal 231, so as to facilitate the electrical connection between the adapter tab 3 and the circuit board assembly 2 arranged on the top wall 211.

[0083] In some embodiments, the battery cell 1 further includes a tab adhesive 30, one end of the tab adhesive 30 is located in the first part 233A, the other end of the tab adhesive 30 is located outside the first part 233A, and the tab adhesive 30 covers part of the adapter tab 3, so as to improve the stability of the sealing between the adapter tab 3 and the first part 233A.

[0084] Specifically, the tab adhesive 30 includes a first sub-adhesive 31 and a second sub-adhesive 32, the first sub-adhesive 31 is located in the first sub-part 2331 and covers part of the first extension segment 61, and the second sub-adhesive 32 extends out of the first sub-part 2331 and covers part of the second extension segment 62, and the second sub-adhesive 32 is bent towards the same direction as the second extension segment 62. The first sub-adhesive 31 and the second sub-adhesive 32 can increase the connection area between the tab adhesive 30 and the adapter tab 3, so as to improve the stability of the sealing between the adapter tab 3 and the first part 233A.

[0085] In some embodiments, as viewed along the third direction Z, the second sub-adhesive 32 is spaced apart from the second sub-part 2332 along the second direction Y, so as to reduce the risk of interference between the second sub-part 2332 and the adapter tab 3 and the tab adhesive 30 located in the first sub-part 2331.

[0086] Please refer to FIG. 1 and FIG. 2, in some embodiments, the circuit board assembly 2 includes a protection plate 40 and a first connecting piece 52. The first connecting piece 52 is connected to the protection plate 40 and the second extension segment 62. The protection plate 40 is arranged on the side of the top seal 231 away from the top wall 211.

[0087] The first connecting piece 52 comprises a first connecting sheet 521, a second connecting sheet 522 and a third connecting sheet 523. The first connecting sheet 521 is connected to the side of the protection plate 40 facing the first portion 233A. The first connecting sheet 521 comprises a first region 521A and a second region 521B. In the third direction Z, the projection of the first region 521A overlaps the projection of the second sub-portion 2332, and the projection of the second region 521B overlaps the projection of the second extending segment 62, so as to increase the connecting area of the first connecting sheet 521 and the protection plate 40, and improve the structural stability and current carrying capacity of the first connecting sheet 521 and the protection plate 40. The second connecting sheet 522 is located on the side of the second extending segment 62 away from the second region 521B. In the third direction Z, the projection of the second connecting sheet 522 is located within the projection range of the first wall 221. The third connecting sheet 523 is connected between the second connecting sheet 522 and the second region 521B, and the third connecting sheet 523, the second connecting sheet 522 and the second region 521B form a U-shaped structure. The second extending segment 62 extends into the space between the second region 521B and the second connecting sheet 522 and is connected to the first connecting piece 52, so as to improve the stability of the electrical connection between the adapter tab 3 and the circuit board assembly 2.

[0088] Optionally, the first connecting piece 52 is made of a nickel sheet.

[0089] In some embodiments, the protection plate 40 comprises a substrate 41 and a flexible circuit board 42. The substrate 41 is arranged on the side of the top sealing edge 231 away from the top wall 211. The side of the substrate 41 facing the top sealing edge 231 is connected to the first conductive piece 51. The flexible circuit board 42 is connected to the substrate 41, and at least part of the flexible circuit board 42 extends from the side of the substrate 41 away from the top sealing edge 231. The end of the flexible circuit board 42 away from the substrate 41 is configured to be connected to the main board of an external terminal device or other external circuit.

[0090] Optionally, the protection plate 40 is a rigid-flexible combined board.

[0091] Referring to FIGS. 1 and 2, in some embodiments, the first corner sealing edge 233 further comprises a third portion 233D connected between the second portion 233B and the first sub-portion 2331. In the second direction Y, the projection of the third portion 233D is located within the projection range of the first wall 221, and the projection of the second portion 233B is located within the projection range of the second wall 222. The first side sealing edge 322 is bent towards the first side wall 212. The first side sealing edge 232 and the first side wall 212 are arranged opposite to each other in the second direction Y. The second portion 233B and the third portion 233D are bent towards the same direction as the first side sealing edge 232. The third portion 233D can block impurities from interfering with the second extending segment 62 and the first connecting piece 52 in the second direction Y, thereby improving the stability of the electrical connection between the adapter tab 3 and the circuit board assembly 2.

[0092] Referring to FIG. 6, in some embodiments, the battery 100A further comprises a first insulating member 94 and a second insulating member 95. The first insulating member 94 is bonded to a side of the top sealing edge 231 away from the top wall 211, and covers the second sub-portion 2332 and extends from the second sub-portion 2332 towards the first side edge 221A, so as to improve the structural stability of the top sealing edge 231 and the second sub-portion 2332. The second insulating member 95 is bonded to both sides of the first sub-portion 2331 in the first direction X and both sides of the third portion 233D in the second direction Y, so as to improve the insulation stability of the first corner sealing edge 233 and the external environment.

[0093] In some embodiments, the battery 100A further comprises a third insulating member 96, which is bonded between the first insulating member 94 and the protection plate 40, and covers the second connecting tab 522, so as to improve the structural stability and the insulation stability of the top sealing edge 231 and the circuit board assembly 2.

[0094] Referring to FIG. 7, in some embodiments, the battery 100A further comprises a fourth insulating member 97, which is connected to a side of the base plate 41 away from the top sealing edge 231, and at least part of the flexible circuit board 42 extends from the fourth insulating member 97. In the third direction Z, the fourth insulating member 97 extends to the second side wall 213 and the third side wall 214 on both sides in the first direction X, respectively, and extends to both sides of the base plate 41 in the second direction Y and covers the adapter tab 3. The fourth insulating member 97 is used to protect the head of the battery 100A, and improve the structural stability between the battery cell 1 and the circuit board assembly 2.

[0095] Optionally, the fourth insulating member 97 is further connected with the corresponding second insulating member 95 on at least one side in the second direction Y, so as to further protect the head of the battery 100A.

[0096] Referring to FIG. 8, in some embodiments, the tab group 11 further comprises a second concave surface 114, which is connected between the first end surface 111 and the second inner surface 113B. The first sub-portion 2331 extends towards the second concave surface 114. In the third direction Z, the projection of the second sub-portion 2332 and the projection of the second concave surface 114 overlap, so as to increase the length of the part of the first sub-portion 2331 away from the second sub-portion 2332 in the second direction Y, and reduce the risk of interference between the second sub-portion 2332 and the adapter tab 3 and the tab jelly 30 located in the first sub-portion 2331.

[0097] Please refer to FIG. 1 and FIG. 3 again, in some embodiments, the tab group 11 includes two first side faces 112 and two first concave faces 113, the two first side faces 112 are oppositely arranged along the second direction Y when viewed along the first direction X, and each first concave face 113 is connected between the first end face 111 and one first side face 112. Correspondingly, the electrode assembly 10 includes two inner tabs 12 with different polarities, and each inner tab 12 extends from one first concave face 113. The main body 21 includes two first side walls 212, and each first side wall 212 is oppositely arranged with one first side face 112. The packaging bag 20 includes two first sealing portions 22, and each first sealing portion 22 is connected between the top wall 211 and one first side wall 212. The packaging portion 23 includes two first side edges 232 and two first corner edges 233, each first side edge 232 is connected with one first side wall 212, and each first corner edge 233 is connected with one first sealing portion 22. The battery 100A includes two adapter tabs 3, one end of each adapter tab 3 is located in one first sealing portion 22 and connected with a corresponding inner tab 12, and the other end of each adapter tab 3 extends from one first corner edge 233 and is electrically connected with the circuit board assembly 2. In the above battery 100A, the two first sealing portions 22 are located at the corner positions of the packaging bag 20, and the connection positions of the two groups of inner tabs 12 and adapter tabs 3 are located at the corner positions of the packaging bag 20, which is beneficial to the connection positions of the two groups of inner tabs 12 and adapter tabs 3 to share the space in the third direction Z with the tab group 11, thereby improving the energy density of the battery 100A.

[0098] It can be understood that, in other embodiments, the top edge 231 extends outwardly from the top wall 211 along the third direction Z when viewed along the second direction Y, and the first portion 233A extends outwardly from the first side edge 221A along the third direction Z. The circuit board assembly 2 is arranged in the space formed by the top wall 211 and the top edge 231, and the circuit board assembly 2 and the top edge 231 are oppositely arranged along the first direction X, so as to improve the layout space of the circuit board assembly 2.

[0099] Embodiment Two

[0100] Please refer to FIG. 9 and FIG. 10, an embodiment of the present application further provides a battery 100B. The battery 100B is different from the battery 100A in the structure of the circuit board assembly 2.

[0101] The circuit board assembly 2 includes a protection plate 40 and a fourth connecting piece 55. The fourth connecting piece 55 is connected with the protection plate 40 and the second extending segment 62. The protection plate 40 is arranged on the side of the top edge 231 away from the top wall 211.

[0102] The fourth connecting piece 55 includes a first conductive sheet 551, a second conductive sheet 552, and a third conductive sheet 553. The first conductive sheet 551 is located on the side of the protection plate 40 facing the first portion 233A. The first conductive sheet 551 includes a fifth region 551A and a sixth region 551B. The projection of the fifth region 551A overlaps the projection of the second sub-portion 2332 along the third direction Z. The projection of the sixth region 551B is within the projection range of the first wall 221. The second conductive sheet 552 is located between the fifth region 551A and the protection plate 40 and is connected to the protection plate 40. The third conductive sheet 553 is connected between the second conductive sheet 552 and the fifth region 551A. The second extension 62 is stacked on the surface of the sixth region 551B away from the first wall 221 and is welded to the sixth region 551B. The area of the second conductive sheet 552 as a patch area connected to the protection plate 40 is smaller than that of the first conductive sheet 551, so as to reduce the risk of interference of the fourth connecting piece 55 with the punched area or the circuit area on the protection plate 40. The area of the first conductive sheet 551 as a welding area connected to the second extension 62 is larger than that of the second conductive sheet 552, so as to facilitate the welding of the second extension 62 to the sixth region 551B by a welding tool.

[0103] In some embodiments, the fourth connecting piece 55 is made of a nickel sheet.

[0104] In some embodiments, the substrate 41 is arranged on the side of the top sealing edge 231 away from the top wall 211. The flexible circuit board 42 is connected to the substrate 41, and at least part of the flexible circuit board 42 extends from the side of the substrate 41 away from the top sealing edge 231. Specifically, the flexible circuit board 42 includes a first segment 421, a second segment 422, a third segment 423, and a fourth segment 424 connected in sequence. The first segment 421 is connected to the side of the substrate 41 facing the top wall 211 and protrudes out of the substrate 41 along the second direction Y. The second segment 422 is bent relative to the first segment 421 and is arranged spaced apart from the substrate 41 along the second direction Y. The third segment 423 is bent relative to the second segment 422 and is at least partially located on the side of the substrate 41 away from the top wall 211. The fourth segment 424 is bent relative to the third segment 423 and extends along the third direction Z. The fourth segment 424 is provided with a connector 425 for connecting to the mainboard of an external terminal device or other external circuit.

[0105] In some embodiments, the protection plate 40 further includes a reinforcing plate 43 connected to the side of the first segment 421 facing the third segment 423. The projection of the reinforcing plate 43 is spaced apart from the projection of the substrate 41, so as to reinforce the punched area of the flexible circuit board 42. Along the third direction Z, the projection of the reinforcing plate 43 overlaps the projection of the second conductive sheet 552, so as to reinforce the area where the protection plate 40 is connected to the fourth connecting piece 55.

[0106] In some embodiments, the protection plate 40 comprises two flexible circuit boards 42 respectively connected to two sides of the substrate 41 in the second direction Y to improve the overcurrent capacity of the protection plate 40.

[0107] In addition to the above differences, the parameters of the battery 100B are substantially the same as those of the battery 100A, and the description of the battery 100A above can be referred to.

[0108] Embodiment Three

[0109] Please refer to FIG. 11 and FIG. 12, an embodiment of the present application further provides a battery 100C. The battery 100C is different from the battery 100A in the structure of the cell 1, and the structures of the circuit board assembly 2 and the adapter tab 3 are also adjusted according to the cell 1.

[0110] Viewed along the first direction X, the first concave surface 113 comprises a third inner surface 113C connected between the first end surface 111 and the first side surface 112. The third inner surface 113C is arranged obliquely relative to the first end surface 111 and the first side surface 112, and the included angle a between the third inner surface 113C and the first end surface 111 satisfies: 110°≤a≤150°. When a is too small (less than 110°), it is easy to cause the space of the first sealing portion 22 in the second direction Y to be narrow, which is not conducive to accommodating the connection part of the inner tab 12 and the adapter tab 3; when a is too large (greater than 150°), it is easy to cause the space of the first sealing portion 22 in the third direction Z to be narrow, which is not conducive to accommodating the connection part of the inner tab 12 and the adapter tab 3. By limiting 110°≤a≤150°, it is conducive to accommodating the connection part of the inner tab 12 and the adapter tab 3.

[0111] Optionally, a is one of 110°, 115°, 120°, 125°, 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139°, 140°, 145°, 150° and other arbitrary values within the range of 110°≤a≤150°.

[0112] Further, 130°≤a≤140°, to further facilitate accommodating the connection part of the inner tab 12 and the adapter tab 3.

[0113] The first sealing portion 22 comprises a third wall 223, one side of the third wall 223 is connected to the second side wall 213, and the other side of the third wall 223 is connected to the third side wall 214. The third wall 223 and the third inner surface 113C are oppositely arranged in a direction perpendicular to the third inner surface 113C, and a space is formed between the third wall 223 and the third inner surface 113C to accommodate the inner tab 12 and part of the adapter tab 3, so as to facilitate accommodation of the connection between the inner tab 12 and the adapter tab 3. The first corner sealing edge 233 is connected to the third wall 223, and the first corner sealing edge 233 is used to seal the first sealing portion 22.

[0114] Optionally, in a direction parallel to the third inner surface 113C, the projection of the space formed between the third wall 223 and the third inner surface 113C can be any one of a triangle, a trapezoid, an arc, and an irregular shape.

[0115] In the above battery 100C, the included angle α between the third inner surface 113C and the first end surface 111 satisfies: 110°≤α≤150°, the third wall 223 and the third inner surface 113C are oppositely arranged in a direction perpendicular to the third inner surface 113C, so that a space is formed between the third wall 223 and the third inner surface 113C to accommodate the inner tab 12 and part of the adapter tab 3, so as to facilitate accommodation of the connection between the inner tab 12 and the adapter tab 3, and the connection between the inner tab 12 and the adapter tab 3 is located at the corner position of the packaging bag 20, which is beneficial to the connection between the inner tab 12 and the adapter tab 3 and the pole piece group 11 sharing the space in the third direction Z, thereby improving the energy density of the battery 100C.

[0116] Please refer to FIG. 11 and FIG. 13, in some embodiments, the third wall 223 comprises a second side edge 223A away from the third inner surface 113C in a direction perpendicular to the third inner surface 113C. The first corner sealing edge 233 comprises a fourth portion 233E, a fifth portion 233F, and a sixth portion 233G. The fourth portion 233E and the fifth portion 233F are spaced apart, and the sixth portion 233G is connected between the fourth portion 233E and the fifth portion 233F, and the sixth portion 233G is connected to the second side edge 223A. The fourth portion 233E is connected to the top sealing edge 231, and in the third direction Z, the projection of the fourth portion 233E is located within the projection of the first sealing portion 22. The fifth portion 233F is connected to the first side sealing edge 232, and in the second direction Y, the projection of the fifth portion 233F is located within the projection of the first sealing portion 22. The adapter tab 3 extends out of the packaging bag 20 from the sixth portion 233G, so as to facilitate electrical connection between the adapter tab 3 and the circuit board assembly 2 arranged on the top wall 211. Correspondingly, part of the tab adhesive 30 is located in the sixth portion 233G, and another part of the tab adhesive 30 is located outside the sixth portion 233G, and the tab adhesive 30 covers part of the adapter tab 3, so as to improve the stability of the sealing between the adapter tab 3 and the sixth portion 233G.

[0117] In some embodiments, the top sealing edge 231 is bent towards the top wall 211, the top sealing edge 231 is located between the circuit board assembly 2 and the top wall 211, the top sealing edge 231 is opposite to the top wall 211 along the third direction Z, and the fourth portion 233E is bent towards the same direction as the top sealing edge 231, so as to reduce the space occupied by the top sealing edge 231, the circuit board assembly 2 and the fourth portion 233E along the third direction Z, improve the head space utilization of the battery 100C, and further improve the energy density of the battery 100C. The sixth portion 233G seals the part of the adapter tab 3 and the adapter tab 3 located in the sixth portion 233G does not need to be bent synchronously with the top sealing edge 231 or the first side sealing edge 232, so as to reduce the risk of poor sealing of the part of the adapter tab 3 sealed by the first corner sealing edge 233 due to bending, and reduce the risk of damage to the tab adhesive 30 located in the first corner sealing edge 233 due to bending, improve the stability of the sealing of the adapter tab 3 and the first corner sealing edge 233, and further improve the safety of the battery 100C.

[0118] In some embodiments, the first side sealing edge 232 is bent towards the first side wall 212, the first side sealing edge 232 and the first side wall 212 are opposite along the second direction Y, and the fifth portion 233F is bent towards the same direction as the first side sealing edge 232, so as to reduce the space occupied by the first side sealing edge 232 and the fifth portion 233F along the second direction Y, and improve the energy density of the battery 100C.

[0119] Please refer to FIG. 13 and FIG. 14 together, in some embodiments, the second side edge 223A extends along a direction parallel to the third inner surface 113C, and the sixth portion 233G extends along a direction perpendicular to the third inner surface 113C, as viewed along the first direction X.

[0120] Specifically, the third wall 223 includes a second edge 223B connecting the second side wall 213, and a third edge 223C connecting the third side wall 214. The second edge 223B, the third edge 223C and the second side edge 223A are parallel to each other. The third wall 223 further includes a third sub-wall 223D located between the second side edge 223A and the second edge 223B, and a fourth sub-wall 223E located between the second side edge 223A and the third edge 223C. As viewed along a direction parallel to the third inner surface 113C, the third sub-wall 223D and / or the fourth sub-wall 223E is a bevel or an arc surface, the bevel is inclined relative to the third inner surface 113C, the axis of the arc surface extends along a direction parallel to the third inner surface 113C, and the third sub-wall 223D and the fourth sub-wall 223E are configured to adapt to the structure of the connection between the inner tab 12 and the adapter tab 3.

[0121] Please refer to FIG. 12 again. In some embodiments, the inner tab 12 is located at a position in the first sealing portion 22 extending in a direction perpendicular to the third inner surface 113C, so as to improve the space utilization of the inner tab 12 in the first sealing portion 22.

[0122] Please refer to FIG. 13 and FIG. 14. In some embodiments, the adapter tab 3 extends from the sixth portion 233G of the packaging bag 20 in a direction perpendicular to the third inner surface 113C, so as to facilitate the overmolding of the adapter tab 3 by the tab adhesive 30.

[0123] Please refer to FIG. 13 again. In some embodiments, the circuit board assembly 2 comprises a protection plate 40 and a second connecting member 53. The protection plate 40 is arranged on the side of the top sealing edge 231 away from the top wall 211. The protection plate 40 and the adapter tab 3 are arranged in the second direction Y. The second connecting member 53 comprises a fourth connecting piece 531, a fifth connecting piece 532, and a sixth connecting piece 533. The fourth connecting piece 531 is connected to the protection plate 40 and arranged opposite to the protection plate 40 in the third direction Z, so as to increase the connection area of the fourth connecting piece 531 and the protection plate 40 and improve the stability of the connection between the fourth connecting piece 531 and the protection plate 40. The fifth connecting piece 532 is connected to the adapter tab 3 and arranged opposite to the adapter tab 3 in the first direction X, so as to increase the connection area of the fifth connecting piece 532 and the adapter tab 3 and improve the stability of the connection between the fifth connecting piece 532 and the adapter tab 3. The sixth connecting piece 533 is connected to the fourth connecting piece 531 and the fifth connecting piece 532 at two ends, so as to adjust the angle between the fourth connecting piece 531 and the fifth connecting piece 532.

[0124] Please refer to FIG. 13 again. In some embodiments, the battery 100C further comprises a fifth insulating member 98, which is bonded between the top sealing edge 231 and the protection plate 40, so as to improve the structural stability and insulation stability of the top sealing edge 231 and the circuit board assembly 2.

[0125] Please refer to FIG. 15. The battery 100C further comprises a sixth insulating member 99, which is connected to the side of the base plate 41 away from the top sealing edge 231, and at least part of the flexible circuit board 42 extends from the sixth insulating member 99. In the third direction Z, the sixth insulating member 99 extends to the second side wall 213 and the third side wall 214 on the two sides in the first direction X, respectively, and the sixth insulating member 99 extends to the base plate 41 on the two sides in the second direction Y and covers the adapter tab 3. The sixth insulating member 99 is used to protect the head of the battery 100C and improve the structural stability between the battery cell 1 and the circuit board assembly 2.

[0126] Optionally, the sixth insulating member 99 also covers the corresponding fifth portion 233F on at least one side in the second direction Y, so as to further protect the head of the battery 100C.

[0127] In addition to the above differences, the parameters of the battery 100C are substantially the same as those of the battery 100A, and the above description of the battery 100A can be referred to.

[0128] Embodiment Four

[0129] Please refer to FIG. 16 and FIG. 17, an embodiment of the present application further provides a battery 100D. The battery 100D is different from the battery 100C in that the structure of the adapter tab 3 is different, and the structure of the circuit board assembly 2 is also adjusted according to the adapter tab 3.

[0130] The second side edge 223A extends in a direction parallel to the third inner surface 113C, and the sixth portion 233G extends in a direction perpendicular to the third inner surface 113C. The adapter tab 3 extends out of the packaging bag 20 from the sixth portion 233G in the third direction Z, so as to shorten the extension path of the adapter tab 3 to the circuit board assembly 2.

[0131] In the above battery 100D, the connection between the inner tab 12 and the adapter tab 3 is located at the corner of the packaging bag 20, which is beneficial to the connection between the inner tab 12 and the adapter tab 3 to share the space in the third direction Z with the tab group 11, thereby improving the energy density of the battery 100D. The adapter tab 3 extends out of the packaging bag 20 from the sixth portion 233G in the third direction Z, so as to shorten the extension path of the adapter tab 3 to the circuit board assembly 2.

[0132] Please refer to FIG. 16 and FIG. 18, the adapter tab 3 includes a third extension segment 63 and a fourth extension segment 64. In the second direction Y, the third extension segment 63 extends out of the packaging bag 20 from the sixth portion 233G in the third direction Z, and the fourth extension segment 64 is folded in the same direction as the top sealing edge 231, so as to connect the fourth extension segment 64 with the circuit board assembly 2.

[0133] The circuit board assembly 2 comprises a protection plate 40 and a third connecting piece 54. The protection plate 40 is arranged on the side of the top sealing edge 231 away from the top wall 211. The third connecting piece 54 comprises a seventh connecting piece 541, an eighth connecting piece 542 and a ninth connecting piece 543. The seventh connecting piece 541 is connected to the side of the protection plate 40 facing the third wall 223. The seventh connecting piece 541 comprises a third region 541A and a fourth region 541B. In the third direction Z, the projection of the third region 541A overlaps the projection of the fourth part 233E, and the projection of the fourth region 541B overlaps the projection of the fourth extension 64, so as to increase the connection area of the seventh connecting piece 541 and the protection plate 40, and improve the structural stability and current carrying capacity of the seventh connecting piece 541 and the protection plate 40. The eighth connecting piece 542 is located on the side of the fourth extension 64 away from the fourth region 541B. In the third direction Z, the projection of the eighth connecting piece 542 is located within the projection range of the third sub-wall 223D. The ninth connecting piece 543 is connected between the eighth connecting piece 542 and the fourth region 541B, and the ninth connecting piece 543, the eighth connecting piece 542 and the fourth region 541B form a U-shaped structure. The fourth extension 64 extends between the fourth region 541B and the eighth connecting piece 542 and is connected to the third connecting piece 54, so as to improve the stability of the electrical connection between the adapter tab 3 and the circuit board assembly 2.

[0134] Optionally, the third connecting piece 54 is made of a nickel sheet.

[0135] In addition to the above differences, the parameters of the battery 100D are substantially the same as those of the battery 100C, and the description of the battery 100C above can be referred to.

[0136] Referring to FIG. 19, an embodiment of the present application further provides a terminal device 200 comprising the battery (100A, 100B, 100C, 100D) of any of the above embodiments.

[0137] Optionally, the terminal device 200 can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc.

[0138] In summary, in the above battery (100A, 100B, 100C, 100D) and terminal device 200, the first concave surface 113 is connected between the first end surface 111 and the first side surface 112, the top wall 211 is opposite to the first end surface 111, the first side wall 212 is opposite to the first side surface 112, and the first sealing portion 22 is connected between the top wall 211 and the first side wall 212, so that the first sealing portion 22 is located at the corner position of the packaging bag 20. By connecting one end of the adapter tab 3 in the first sealing portion 22 and connecting the inner tab 12, the connection between the inner tab 12 and the adapter tab 3 is located at the corner position of the packaging bag 20, which is beneficial to the connection between the inner tab 12 and the adapter tab 3 and the pole piece group 11 to share the space in the third direction Z, thereby improving the energy density of the battery (100A, 100B, 100C, 100D). The part of the adapter tab 3 sealed by the first corner sealing edge 233 extends along the fourth direction V, and the included angle β between the fourth direction V and the first direction X satisfies: 60°≤β≤120°, so as to reduce the risk of poor sealing caused by excessive bending of the part of the adapter tab 3 sealed by the first corner sealing edge 233, thereby improving the safety of the battery 100A.

[0139] In addition, those skilled in the art can 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 by the present application.

Claims

1. A battery, characterized by, The battery comprises: An electric core comprising: An electrode assembly comprising a tab group and an inner tab, the tab group comprising a first end face, a first side face and a first concave face, the first end face and the first side face being spaced apart along a second direction and a third direction as viewed along a first direction, the first concave face being connected between the first end face and the first side face, the first direction being a thickness direction of the electric core, the first direction, the second direction and the third direction being perpendicular to each other; A packaging bag, the electrode assembly being accommodated in the packaging bag, the packaging bag comprising a main body part, a first sealing part and a sealing part, the main body part comprising a top wall and a first side wall, the top wall and the first end face being oppositely arranged, the first side wall and the first side face being oppositely arranged, the first sealing part being connected between the top wall and the first side wall, a projection of the first sealing part being located between the top wall and the first side wall along the second direction, a projection of the first sealing part being located between the top wall and the first side wall along the third direction, the inner tab being located in the first sealing part, the sealing part comprising a top sealing edge, a first side sealing edge and a first corner sealing edge, the top sealing edge being connected to the top wall, the first side sealing edge being connected to the first side wall, the first corner sealing edge being connected to the first sealing part, the top sealing edge and the first side sealing edge; A circuit board assembly arranged on the top wall; An adapter tab, one end of the adapter tab being located in the first sealing part and connected to the inner tab, the other end of the adapter tab extending out of the first corner sealing edge and electrically connected to the circuit board assembly, a part of the first corner sealing edge sealing the adapter tab extending along a fourth direction, an included angle β between the fourth direction and the first direction satisfying 60°≤β≤120°.

2. The battery of claim 1, wherein, 80°≤β≤110°。 3. The battery of any one of claims 1 to 2, wherein, As viewed along the first direction, the first concave face comprises a first inner surface and a second inner surface connected to the first inner surface, the first inner surface being connected to the first side face and extending along the second direction, the second inner surface being connected to the first end face and extending along the third direction; The first sealing part comprises a first wall and a second wall, the second wall being connected to the first side wall and spaced apart from the second inner surface along the second direction, the first wall being connected between the second wall and the top wall, a space accommodating the inner tab and the adapter tab being formed between the first wall and the second wall; The first corner sealing edge comprises a first part and a second part spaced apart, the first part being connected to the first wall and the top sealing edge, the second part being connected to the second wall and the first side sealing edge, the adapter tab extending out of the packaging bag from the first part.

4. The battery of claim 3, wherein the cathode is a lithium cobalt oxide cathode. The first wall comprises a first side edge away from the first inner surface along the third direction, the first side edge extending along the second direction, as viewed along the second direction, the first side edge and the top wall being spaced apart along the third direction; The first part comprises a first sub-part and a second sub-part, the first sub-part being connected to the first side edge, The first sub-portion is located between the first side edge and the top wall in the third direction, and is located between the second portion and the top wall in the second direction, and the second sub-portion connects the first sub-portion and the top seal edge; The top seal edge is bent towards the top wall, and is located between the circuit board assembly and the top wall, and the top seal edge and the top wall are oppositely arranged along the third direction, the first sub-portion extends along the third direction, and the second sub-portion is bent towards the same direction as the top seal edge, and the adapter tab extends out of the packaging bag from a part of the first sub-portion away from the second sub-portion.

5. The battery of claim 4, wherein the cathode is a lithium cobalt oxide cathode. The pole piece group further comprises a second concave surface connected between the first end surface and the second inner surface, the first sub-portion extends towards the second concave surface along the third direction, and a projection of the second sub-portion overlaps a projection of the second concave surface.

6. The battery of claim 4, wherein the cathode comprises a lithium cobalt oxide. The adapter tab comprises a first extension segment and a second extension segment, the first extension segment extends out of the packaging bag from the first sub-portion along the third direction, the second extension segment is connected to an end of the first extension segment away from the first sub-portion, and the second extension segment is bent towards the same direction as the top seal edge. The battery cell further comprises a tab rubber, the tab rubber comprises a first sub-rubber and a second sub-rubber, the first sub-rubber is located in the first sub-portion and covers the first extension segment, and the second sub-rubber extends out of the first sub-portion and covers part of the second extension segment, and the second sub-rubber is bent towards the same direction as the second extension segment.

7. The battery of claim 6, wherein the cathode comprises a lithium metal oxide. In the third direction, the second sub-rubber is spaced apart from the second sub-portion along the second direction.

8. The battery of any one of claims 6 to 7, wherein, The circuit board assembly comprises a protection plate and a first connecting piece, the first connecting piece is connected to the protection plate and the second extension segment, the protection plate is arranged on a side of the top seal edge away from the top wall, the first connecting piece comprises a first connecting sheet, a second connecting sheet and a third connecting sheet, the first connecting sheet is connected to a side of the protection plate facing the first portion, the first connecting sheet comprises a first area and a second area, in the third direction, a projection of the first area overlaps a projection of the second sub-portion, and a projection of the second area overlaps a projection of the second extension segment, the second connecting sheet is located on a side of the second extension segment away from the second area, the third connecting sheet is connected between the second connecting sheet and the second area, and the second extension segment extends into between the second area and the second connecting sheet.

9. The battery according to any one of claims 4 to 8, wherein the electrolyte solution contains a lithium salt. The first corner seal edge further comprises a third portion connected between the second portion and the first sub-portion; The first side seal edge is bent towards the first side wall, and the first side seal edge and the first side wall are oppositely arranged along the second direction, and the second portion, the third portion and the first side seal edge are bent towards the same direction. The battery further comprises a first insulating member and a second insulating member, the first insulating member is bonded to both sides of the top sealing edge in the third direction, the first insulating member also covers the second sub-portion and extends from the second sub-portion towards the first side edge, the second insulating member is bonded to both sides of the first sub-portion in the first direction and both sides of the third portion in the second direction.

10. The battery of any one of claims 1 to 2, wherein, Viewed along the first direction, the first concave surface comprises a third inner surface, the third inner surface is connected between the first end surface and the first side surface, the third inner surface is arranged obliquely relative to the first end surface and the first side surface, an included angle α between the third inner surface and the first end surface satisfies: 110°≤α≤150°; The first sealing portion comprises a third wall, the third wall and the third inner surface are arranged oppositely in a direction perpendicular to the third inner surface, a space for accommodating the inner tab and part of the adapter tab is formed between the third wall and the third inner surface, and the first corner sealing edge connects the third wall.

11. The battery of claim 10, wherein the electrolyte comprises a lithium salt. The third wall comprises a second side edge away from the third inner surface in a direction perpendicular to the third inner surface; The first corner sealing edge comprises a fourth portion, a fifth portion and a sixth portion, the fourth portion and the fifth portion are arranged at intervals, the sixth portion is connected between the fourth portion and the fifth portion, the sixth portion connects the second side edge, the fourth portion is connected to the top sealing edge, and a projection of the fourth portion is located within a projection of the first sealing portion along the third direction, the fifth portion is connected to the first side sealing edge, and a projection of the fifth portion is located within the projection of the first sealing portion along the second direction; The adapter tab extends out of the packaging bag from the sixth portion.

12. The battery of claim 11, wherein the cathode comprises a lithium metal oxide. The top sealing edge is bent towards the top wall, and the top sealing edge is located between the circuit board assembly and the top wall, the top sealing edge and the top wall are arranged oppositely along the third direction, and the fourth portion is bent towards the same direction as the top sealing edge.

13. The battery of claim 12, wherein the cathode comprises a lithium metal oxide. Viewed along the first direction, the second side edge extends along a direction parallel to the third inner surface, and the sixth portion extends along a direction perpendicular to the third inner surface; The adapter tab extends out of the packaging bag from the sixth portion along a direction perpendicular to the third inner surface.

14. The battery of claim 13, wherein the cathode comprises a lithium metal oxide. The circuit board assembly comprises a protection plate and a second connecting member, the protection plate is arranged on a side of the top sealing edge away from the top wall, the protection plate and the adapter tab are arranged at intervals along the second direction, and the second connecting member comprises a fourth connecting sheet, a fifth connecting sheet and a sixth connecting sheet, the fourth connecting sheet is connected to the protection plate and arranged oppositely to the protection plate along the third direction, the fifth connecting sheet is connected to the adapter tab and arranged oppositely to the adapter tab along the first direction, and both ends of the sixth connecting sheet are connected to the fourth connecting sheet and the fifth connecting sheet respectively.

15. The battery of claim 12, wherein the cathode comprises a lithium metal oxide. Viewed along the first direction, the second side edge extends along a direction parallel to the third inner surface, and the sixth portion extends along a direction perpendicular to the third inner surface; The adapter tab protrudes from the sixth portion to the outside of the packaging bag along the third direction.

16. The battery of claim 15, wherein the cathode comprises a lithium metal oxide. The adapter tab comprises a third extension and a fourth extension, and the third extension protrudes from the sixth portion to the outside of the packaging bag along the third direction as viewed along the second direction, and the fourth extension is bent in the same direction as the top sealing edge. The circuit board assembly comprises a protection plate and a third connecting piece, the protection plate is arranged on the side of the top sealing edge away from the top wall, the third connecting piece comprises a seventh connecting piece, an eighth connecting piece and a ninth connecting piece, the seventh connecting piece is connected to the side of the protection plate facing the third wall, the seventh connecting piece comprises a third region and a fourth region, and the projection of the third region overlaps the projection of the fourth portion along the third direction, and the projection of the fourth region overlaps the projection of the fourth extension, the eighth connecting piece is located on the side of the fourth extension away from the fourth region, and the ninth connecting piece is connected between the eighth connecting piece and the fourth region, and the fourth extension extends into the fourth region and the eighth connecting piece.

17. The battery of any one of claims 11 to 16, wherein, The first side sealing edge is bent toward the first side wall, the first side sealing edge and the first side wall are oppositely arranged along the second direction, and the fifth portion is bent in the same direction as the first side sealing edge.

18. The battery of any one of claims 10 to 17, wherein, The position of the inner tab in the first sealing portion extends along a direction perpendicular to the third inner surface.

19. The battery of any one of claims 1 to 18, wherein, The extension direction of the inner tab is perpendicular to the first direction, and the inner tab and the adapter tab are stacked and welded in the first direction.

20. A terminal device, comprising: A battery comprising any one of the cells of claims 1-19. A battery comprising any one of the cells of claims 1-19.

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