Battery and terminal device

Abstract

A battery (100A, 100B, 100C, 100D, 100E) and a terminal device (200). The battery (100A, 100B, 100C, 100D, 100E) comprises a battery cell (1), a circuit board assembly (2) and adapter tabs (3), wherein the battery cell (1) comprises an electrode assembly (10) and a pouch (20). The electrode assembly (10) comprises an electrode sheet set (11) and inner tabs (12). The electrode sheet set (11) comprises a first end face (111), first side faces (112) and first recessed faces (113); and the electrode assembly (10) is accommodated in the pouch (20). The pouch (20) comprises a body portion (21), first sealing portions (22) and a packaging portion (23). The body portion (21) comprises a top wall (211) and first side walls (212), with the top wall (211) being arranged opposite the first end face (111), and the first side walls (212) being arranged opposite the first side faces (112). The first sealing portions (22) are connected between the top wall (211) and the first side walls (212). The inner tabs (12) are respectively located in the first sealing portions (22). The packaging portion (23) comprises a top sealing edge (231), first side sealing edges (232) and first corner sealing edges (233). The circuit board assembly (2) is disposed on the top wall (211). One end of each adapter tab (3) is located in the corresponding first sealing portion (22) and is connected to the corresponding inner tab (12), and the other end of said adapter tab (3) extends out from the corresponding first corner sealing edge (233) and is electrically connected to the circuit board assembly (2). The battery (100A, 100B, 100C, 100D, 100E) is conducive to improving 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 laminated 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.

[0003] SUMMARY

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

[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.

[0006] In the above-mentioned battery, the first concave face is connected between the first end face and the first side face, the top wall and the first end face are arranged opposite to each other, the first side wall and the first side face are arranged opposite to each other, and the first sealing part is connected between the top wall and the first side wall, so that the first sealing part is located at the corner of the packaging bag. One end of the adapter tab is located in the first sealing part and connected to the inner tab, so that the connection part of the inner tab and the adapter tab is located at the corner of the packaging bag, which is beneficial to the connection part of 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.

[0007] In some embodiments of the present application, the first concave surface comprises 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 along the second direction, and the second inner surface is connected to the first end surface and extends along the third direction, when viewed along the first direction. The first sealing portion comprises 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 along the second direction, and the first wall is connected between the second wall and the top wall, and a 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 comprises 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.

[0008] In some embodiments of the present 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 is arranged side by side with the top wall along the second direction. The first part is connected to the first side edge. The top sealing edge is bent towards the top wall, 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 opposite to each other along the third direction, and the first part and the top sealing edge are bent towards the same direction. The adapter tab located at the first part is bent synchronously with the top sealing edge, so as to reduce the space occupied by the top sealing edge, the circuit board assembly and the first part in the third direction, improve the head space utilization rate of the battery, and further improve the energy density of the battery.

[0009] In some embodiments of the present 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 when viewed along the second direction, the first side edge and the top wall are spaced apart along the third direction. The first part comprises a first sub-part and a second sub-part, the first sub-part is connected to the first side edge, the first sub-part is located between the first side edge and the top wall in the third direction, the first sub-part is located between the second part and the top wall in the second direction, and the second sub-part is connected between the first sub-part and the top sealing edge. The top sealing edge is bent towards the top wall, 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 opposite to each other along the third direction, the first sub-part extends along the third direction, and the second sub-part is bent towards the same direction as the top sealing edge. The adapter tab extends out of the packaging bag from a part of the first sub-part away from the second sub-part, and the part of the first part sealing the adapter tab and the adapter tab located in the first part do not need to be bent synchronously with the top sealing edge, so as to reduce the risk of poor sealing caused by bending of the first corner sealing edge and the risk of damage to the tab adhesive located in the first corner sealing edge caused by bending, improve the stability of sealing of the adapter tab and the first corner sealing edge, and further improve the safety of the battery.

[0010] In some embodiments of the application, 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 in the third direction, and a projection of the second sub-portion overlaps a projection of the second concave surface in the second direction, so as to increase a length of a portion of the first sub-portion away from the second sub-portion in the second direction, and reduce a 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 and a second extension. The first extension extends out of the package from the first sub-portion in the third direction. The second extension is connected to an end of the first extension away from the first sub-portion, and the second extension is bent in the same direction as the top seal edge. The battery cell further comprises a tab adhesive comprising 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. The second sub-adhesive extends out of the first sub-portion and covers a portion of the second extension. The second sub-adhesive is bent in the same direction as the second extension. The first sub-adhesive and the second sub-adhesive can increase a connection area of the tab adhesive and the adapter tab, so as to improve stability of the adapter tab and the first portion seal.

[0012] In some embodiments of the application, as viewed in the third direction, the second sub-adhesive is spaced apart from the second sub-portion in the second direction, so as to reduce a 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 application, 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. 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 region and a second region. As viewed in the third direction, a projection of the first region overlaps a projection of the second sub-portion, and a projection of the second region overlaps a projection of the second extension, so as to increase a connection area of the first connecting sheet and the protection plate, and improve structural stability and current-carrying capacity of the first connecting sheet and the protection plate. The second connecting sheet is located on a side of the second extension away from the second region. The third connecting sheet is connected between the second connecting sheet and the second region. The second extension extends into a space between the second region and the second connecting sheet, so as to improve stability of electrical connection between the adapter tab and the circuit board assembly.

[0014] In some embodiments of the present application, the first corner seal further comprises a third portion connected between the second portion and the first sub-portion. The first side seal is bent towards the first side wall, the first side seal and the first side wall are oppositely arranged along the second direction, and the second portion, the third portion and the first side seal 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 seal in the third direction, and the first insulating member covers the second sub-portion and extends from the second sub-portion towards the first side edge, so as to improve the structural stability of the top seal and the second sub-portion. 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, so as to improve the insulation stability between the first corner seal and the external environment.

[0015] In some embodiments of the present application, as viewed along 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 oppositely arranged 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 oppositely arranged with the third inner surface along 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 seal 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 beneficial 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 the projection of the fourth portion in the third direction is located within the projection of the first sealing portion. The fifth portion is connected to the first side seal, and the projection of the fifth portion in the second direction is located within the projection of the first sealing portion. The adapter tab extends out of the packaging bag from the sixth portion, so as to facilitate the 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 located between the circuit board assembly and the top wall. The top seal and the top wall are oppositely arranged along the third direction, and 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 rate of the battery, and thereby 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, and the sixth portion extends in a direction perpendicular to the third inner surface, as viewed in the first direction. The adapter tab extends out of the packaging bag from the sixth portion in a direction perpendicular to the third inner surface, so as to facilitate the overmolding of the adapter tab by the tab adhesive.

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

[0020] In some embodiments of the present application, the second side edge extends in a direction parallel to the third inner surface, and the sixth portion extends in a direction perpendicular to the third inner surface, as viewed in the first direction. The adapter tab extends out of the packaging bag from the sixth portion in the third direction, so as 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, as viewed in the second direction, the third extension segment extends out of the packaging bag from the sixth portion in the third 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 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, and the seventh connecting piece includes a third region and a fourth region. As viewed in the third direction, the projection of the third region overlaps the projection of the fourth portion, and the projection of the fourth region overlaps the projection of the fourth extension segment, so as to increase the connection area of the seventh connecting piece and the protection plate and improve the structural stability and current-carrying capacity of the seventh connecting piece and the protection plate. The eighth connecting piece is located on the side of the fourth extension segment away from the fourth region, and the ninth connecting piece is connected between the eighth connecting piece and the fourth region. The fourth extension segment extends between the fourth region and the eighth connecting piece, so as 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 towards the first side wall, the first side sealing edge and the first side wall are oppositely arranged along a second direction, and the fifth part is bent towards the same direction as the first side sealing edge to reduce the space occupied by the first side sealing edge and the fifth part 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 part extends in a direction perpendicular to the third inner surface to facilitate the space utilization of the inner tab in the first sealing part.

[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 in reverse due to bending and facilitate 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 comprises the battery of any of the above embodiments.

[0026] In the above battery and terminal device, the first concave surface is connected between the first end surface and the first side surface, the top wall is oppositely arranged with the first end surface, the first side wall is oppositely arranged with the first side surface, and the first sealing part is connected between the top wall and the first side wall to locate the first sealing part at the corner of the packaging bag. One end of the adapter tab is located in the first sealing part and connected with the inner tab to locate the connection between the inner tab and the adapter tab at the corner of the packaging bag, which facilitates the connection between 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. 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 structural schematic diagram of an electrode assembly of a battery in an embodiment of the present application.

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

[0030] FIG. 4 is a structural schematic diagram of a first insulating layer and a second insulating layer of a battery in an embodiment of the present application.

[0031] FIG. 5 is a structural schematic diagram of a third insulating layer of a battery in an embodiment of the present application.

[0032] FIG. 6 is a structural schematic diagram of a battery in another embodiment of the present application.

[0033] FIG. 7 is a partial exploded structural schematic diagram of a battery in an embodiment of the present application.

[0034] FIG. 8 is a structural diagram of an electrode assembly of a battery in one embodiment of the present application.

[0035] FIG. 9 is a structural diagram of a first insulating member, a second insulating member, and a third insulating member of a battery in one embodiment of the present application.

[0036] FIG. 10 is a structural diagram of a fourth insulating member of a battery in one embodiment of the present application.

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

[0038] FIG. 12 is a partially exploded structural diagram of a battery in one embodiment of the present application.

[0039] FIG. 13 is a structural diagram of a battery in another embodiment of the present application.

[0040] FIG. 14 is a structural diagram of an electrode assembly of a battery in one embodiment of the present application.

[0041] FIG. 15 is a partially exploded structural diagram of a battery in one embodiment of the present application.

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

[0043] FIG. 17 is a structural diagram of a sixth insulating member of a battery in one embodiment of the present application.

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

[0045] FIG. 19 is a structural diagram of an electrode assembly of a battery in one embodiment of the present application.

[0046] FIG. 20 is a partially exploded structural diagram of a battery in one embodiment of the present application.

[0047] FIG. 21 is a structural diagram of a terminal device in one embodiment of the present application.

[0048] Main element symbol explanation Battery 100A, 100B, 100C, 100D, 100E 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 first edge 233C third portion 233D fourth portion 233E fifth portion 233F sixth portion 233G extreme ear rubber 30 first sub-rubber 31 second sub-rubber 32 circuit board assembly 2 protection plate 40 base plate 41 flexible circuit board 42 first section 421 second section 422 third section 423 fourth section 424 connector 425 reinforcing plate 43 first conductive member 51 first connecting member 52 first connecting piece 521 first area 521A second area 521B second connecting piece 522 third connecting piece 523 second connecting member 53 fourth connecting piece 531 fifth connecting piece 532 sixth connecting piece 533 third connecting member 54 seventh connecting piece 541 third area 541A fourth area 541B eighth connecting piece 542 ninth connecting piece 543 fourth connecting member 55 first conductive piece 551 fifth area551A sixth region 551B second conductive sheet 552 third conductive sheet 553 switching tab 3 first extension 61 second extension 62 third extension 63 fourth extension 64 first insulating layer 91 second insulating layer 92 third insulating layer 93 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

[0049] The following detailed description will further describe the present application with reference to the above mentioned drawings. DETAILED DESCRIPTION

[0050] 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, not all the embodiments of the present application.

[0051] 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 a middle element can be present at the same time. When an element is considered to be "arranged" on another element, it can be directly arranged on the other element or a middle element can be present at the same time. It should be understood that considering the actual processing tolerance factor, 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 0-±10% tolerance.

[0052] When a value is considered to be "equal" to another value, it means that the two values are equal within a set deviation, which is within 10%, that is, even if the values are not equal, they are considered to be approximately equal when at least one of the two values fluctuates within the set deviation. When a value is considered to be "1:1" to another value, it means that the two values are equal within a set deviation, which is within 10%, that is, even if the values are not equal, they are considered to be approximately equal when at least one of the two values fluctuates within the set deviation.

[0053] 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. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "overlap" means that the projected portions of two components overlap or the projections of two components coincide.

[0054] An embodiment of the present application provides a battery, which includes a cell, a circuit board assembly, and a transition tab. The cell includes an electrode assembly and a packaging bag. The electrode assembly includes a tab group and an inner tab. The tab group includes 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 when 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 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 includes a main body portion, a first sealing portion, and a sealing portion. The main body portion includes a top wall and a first side wall. The top wall is opposite to the first end face, and 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, and 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 sealing portion includes 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 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, and the other end of the transition tab extends from the first corner sealing edge and is electrically connected to the circuit board assembly.

[0055] In the battery, the first concave surface is connected between the first end surface and the first side surface, the top wall is oppositely arranged to the first end surface, the first side wall is oppositely arranged 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 the corner position of the packaging bag. By arranging one end of the adapter tab in the first sealing portion and connecting the inner tab with the adapter tab, 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 sharing the space in the third direction with the tab group, thereby improving the energy density of the battery.

[0056] Embodiment one

[0057] Please refer to FIG. 1 and FIG. 2, an embodiment of the present application provides a battery 100A, which comprises an electric core 1, a circuit board assembly 2 and an adapter 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 be used.

[0058] The electric core 1 comprises an electrode assembly 10 and a packaging bag 20. The electrode assembly 10 comprises a tab group 11 and an inner tab 12. The tab group 11 comprises a positive electrode tab, a separator and a negative electrode tab arranged in sequence, and 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 adapter tab 3.

[0059] The tab group 11 comprises 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 electric core 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 electric core 1, and the third direction Z is the length direction of the electric core 1.

[0060] 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 comprises a main body portion 21, a first sealing portion 22 and a sealing portion 23. The main body portion 21 is a part of the packaging film provided with a punched pit, and the tab group 11 is arranged in the main body portion 21. The main body portion 21 comprises a top wall 211 and a first side wall 212, and the top wall 211 is oppositely arranged to the first end surface 111, and the first side wall 212 is oppositely arranged to the first side surface 112.

[0061] The first sealing portion 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 portion 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 portion 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 portion 22 protruding out of the top wall 211 or the first side wall 212. The inner tab 12 is located in the first sealing portion 22.

[0062] The packaging portion 23 is a portion where the packaging film overlaps. The packaging portion 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, the first side sealing edge 232 is connected to the first side wall 212, and the top sealing edge 231 and the first side sealing edge 232 are used to seal the main body portion 21. The first corner sealing edge 233 is connected to the first sealing portion 22, the top sealing edge 231, and the first side sealing edge 232, and the first corner sealing edge 233 is used to seal the first sealing portion 22.

[0063] 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 portion 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 portion 22, and 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.

[0064] In the above-mentioned 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 and the first end surface 111 are oppositely arranged, the first side wall 212 and the first side surface 112 are oppositely arranged, 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 arranging one end of the adapter tab 3 in the first sealing portion 22 and connecting it to 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 conducive to the connection between the inner tab 12 and the adapter tab 3 sharing the space in the third direction Z with the tab group 11, thereby improving the energy density of the battery 100A.

[0065] In addition, compared with the existing battery which improves the space utilization rate by 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 reverse 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.

[0066] In some embodiments, the extending direction of the inner lug 12 is perpendicular to the first direction X, and the inner lug 12 and the adapter lug 3 are stacked and welded in the first direction X to reduce the risk of the inner lug being inserted upside down due to bending, and to facilitate improving the stability of the connection between the inner lug 12 and the adapter lug 3.

[0067] Please refer to FIG. 2 and FIG. 3, in some embodiments, as viewed along the first direction X, the first concave surface 113 includes a first inner surface 113A and a second inner surface 113B connected to the first inner surface 113A. The first inner surface 113A is connected to the first side surface 112 and extends along the second direction Y, and the second inner surface 113B is connected to the first end surface 111 and extends along the third direction Z. The inner lug 12 extends from the first inner surface 113A or the second inner surface 113B.

[0068] The first sealing portion 22 includes 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 along the second direction Y. The first wall 221 is connected between the second wall 222 and the top wall 211, as viewed along the second direction Y, the first wall 221 is arranged around the edge of the second wall 222, and a space is formed between the first wall 221 and the second wall 222 to accommodate the connection between the inner lug 12 and the adapter lug 3.

[0069] Optionally, as viewed along the second direction Y, the projection of the space formed between the first wall 221 and the first inner surface 113A can be any one of a triangle, a trapezoid, an arc, and an irregular shape.

[0070] 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 an arc surface to reduce the risk of stress concentration points occurring at the connection and causing tearing.

[0071] In some embodiments, the first corner sealing edge 233 includes a first portion 233A and a second portion 233B 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 lug 3 extends from the first portion 233A to the packaging bag 20 to facilitate electrical connection between the adapter lug 3 and the circuit board assembly 2 arranged on the top wall 211.

[0072] Please continue to refer to FIG. 2 and FIG. 3, in some embodiments, the first corner seal 233 further comprises a first cut edge 233C extending from the first portion 233A away from the edge of the first wall 221 to the second portion 233B away from the edge of the second wall 222. When viewed along the first direction X, the first corner seal 233 is in the unfolded state (i.e. the plane on which the first corner seal 233 lies is perpendicular to the first direction X), the first cut edge 233C is arranged obliquely relative to the second direction Y and the third direction Z to reduce the risk of interference when the first portion 233A and / or the second portion 233B are bent.

[0073] In some embodiments, the battery cell 1 further comprises a tab adhesive 30, one end of the tab adhesive 30 is located in the first portion 233A, the other end of the tab adhesive 30 is located outside the first portion 233A, and the tab adhesive 30 covers part of the adapter tab 3 to improve the stability of the sealing of the adapter tab 3 and the first portion 233A.

[0074] Please continue to refer to FIG. 3, 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 along the second direction Y and is arranged side by side with the top wall 211 along the second direction Y, and the first portion 233A is connected to the first side edge 221A. The top seal 231 is bent towards the top wall 211, the top seal 231 is located between the circuit board assembly 2 and the top wall 211, the top seal 231 is arranged opposite to the top wall 211 along the third direction Z, the first portion 233A is bent towards the same direction as the top seal 231, and the adapter tab 3 located in the first portion 233A is bent synchronously with the first portion 233A, so as to reduce the space occupied by the top seal 231, the circuit board assembly 2 and the first portion 233A in the third direction Z, improve the head space utilization rate of the battery 100A, and further improve the energy density of the battery 100A.

[0075] Please refer to FIG. 1 and FIG. 3 together, in some embodiments, the main body 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, and the top seal 231 is bent towards one end of the second side wall 213 adjacent to the top wall 211. The first wall 221 further comprises a first edge 221B connected to the second side wall 213 in the third direction Z, and 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, and when viewed along the second direction Y, the first sub-wall 221C is a bevel or an arc surface, the bevel is arranged obliquely relative to the second side wall 213, the axis of the arc surface extends along the second direction Y, and 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.

[0076] In some embodiments, the main body 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 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 along the third direction Z, i.e. the second sub-wall 221D and the third side wall 214 are in the same plane.

[0077] Please refer to FIG. 1 and FIG. 3, 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 arranged opposite to each other along the second direction Y, and the second part 233B is bent towards the same direction as the first side seal 232, the second part 233B and the second wall 222 are arranged opposite to each other 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.

[0078] Please continue to refer to FIG. 3, in some embodiments, the circuit board assembly 2 comprises a protection plate 40 and a first conductive piece 51. The protection plate 40 is arranged on the side of the top seal 231 away from the top wall 211, and the protection plate 40 and the first part 233A are arranged opposite to each other along the third direction Z. The first conductive piece 51 is connected to the side of the protection plate 40 facing the first part 233A, the first conductive piece 51 has a U-shaped structure, and the opening of the first conductive piece 51 faces the second side wall 213 in the first direction X. The part of the adapter tab 3 extending from the first part 233A passes through the opening of the first conductive piece 51 and enters the first conductive piece 51 and is connected to the first conductive piece 51, so as to improve the stability of the electrical connection between the adapter tab 3 and the circuit board assembly 2.

[0079] Optionally, the first conductive piece 51 is made of a nickel sheet.

[0080] 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 seal 231 away from the top wall 211, the side of the substrate 41 facing the top seal 231 is connected to the first conductive piece 51, and 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 seal 231. The end of the flexible circuit board 42 away from the substrate 41 is configured to connect to the main board of an external terminal device or other external circuit.

[0081] Optionally, the protection plate 40 is a rigid-flexible combined board.

[0082] Referring to FIG. 4, in some embodiments, the battery 100A further comprises a first insulating layer 91 connected to a side of the top seal edge 231 facing the top wall 211 and a side of the first portion 233A facing the first wall 221, so as to improve the structural stability and insulation stability of the top seal edge 231 and the top wall 211.

[0083] In some embodiments, the battery 100A further comprises a second insulating layer 92 connected to a side of the top seal edge 231 away from the top wall 211, so as to improve the structural stability and insulation stability of the top seal edge 231 and the circuit board assembly 2.

[0084] Referring to FIGS. 1 and 5, in some embodiments, the battery 100A further comprises a third insulating layer 93 connected to a side of the base plate 41 away from the top seal edge 231, and at least part of the flexible circuit board 42 extends from the third insulating layer 93. In the third direction Z, the third insulating layer 93 extends to the second side wall 213 and the third side wall 214 on both sides of the first direction X, respectively, and the third insulating layer 93 extends to both sides of the base plate 41 in the second direction Y and covers the adapter tab 3. The third insulating layer 93 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.

[0085] Please refer to FIG. 1 and FIG. 2 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.

[0086] 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.

[0087] Embodiment Two

[0088] Please refer to FIG. 6, 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 cell 1, and the structures of the circuit board assembly 2 and the adapter tab 3 are also adjusted according to the cell 1.

[0089] Please refer to FIG. 6 and FIG. 7, the first side edge 221A and the top wall 211 are spaced apart along the third direction Z as viewed along the second direction Y. 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 and is located between the first side edge 221A and the top wall 211 along the third direction Z as viewed along the second direction Y. The first sub-portion 2331 is located between the second portion 233B and the top wall 211 along the second direction Y as viewed along the third direction Z. The second sub-portion 2332 is connected to the first sub-portion 2331 and the top seal edge 231.

[0090] The top seal edge 231 is bent towards the top wall 211. The top seal edge 231 is located between the circuit board assembly 2 and the top wall 211. The top seal edge 231 is opposite to the top wall 211 along the third direction Z. The first sub-portion 2331 extends along the third direction Z. The second sub-portion 2332 is bent towards the same direction as the top seal edge 231. The adapter tab 3 extends out of the packaging bag 20 from a position where the first sub-portion 2331 and the second sub-portion 2332 are apart.

[0091] In the above battery 100B, the first portion 233A seals the position of the adapter tab 3 and the adapter tab 3 located in the first portion 233A does not need to be bent synchronously with the top seal edge 231. This reduces the risk of poor sealing caused by bending of the first corner seal edge 233 and reduces the risk of damage to the tab adhesive 30 located in the first corner seal edge 233 caused by bending. This improves the stability of the sealing of the adapter tab 3 and the first corner seal edge 233, and further improves the safety of the battery 100B.

[0092] Please refer to FIG. 7 and FIG. 8, in some embodiments, the tab group 11 further comprises a second concave surface 114 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. The projection of the second sub-portion 2332 and the projection of the second concave surface 114 overlap along the third direction Z. This facilitates increasing the length of the position where the first sub-portion 2331 and the second sub-portion 2332 are apart along the second direction Y, and reduces the risk of interference between the second sub-portion 2332 and the adapter tab 3 and the tab adhesive 30 located in the first sub-portion 2331.

[0093] Please refer to FIG. 7 and FIG. 8, in some embodiments, the adapter tab 3 comprises a first extension section 61 and a second extension section 62. The first extension section 61 extends out of the packaging bag 20 along the third direction Z from the first sub-portion 2331. The second extension section 62 is connected to an end of the first extension section 61 away from the first sub-portion 2331. The second extension section 62 is bent towards the same direction as the top seal edge 231. This facilitates electrical connection between the adapter tab 3 and the circuit board assembly 2 arranged on the top wall 211.

[0094] 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-portion 2331 and covers part of the first extension 61. The second sub-adhesive 32 extends out of the first sub-portion 2331 and covers part of the second extension 62. The second sub-adhesive 32 and the second extension 62 are bent in the same direction. The first sub-adhesive 31 and the second sub-adhesive 32 can increase the connection area of the tab adhesive 30 and the adapter tab 3, thereby improving the stability of the sealing between the adapter tab 3 and the first portion 233A.

[0095] In some embodiments, the second sub-adhesive 32 and the second sub-portion 2332 are spaced apart along the second direction Y when viewed along the third direction Z, so as to reduce the risk of interference between the second sub-portion 2332 and the adapter tab 3 and the tab adhesive 30 located in the first sub-portion 2331.

[0096] Referring to FIGS. 6 and 7, 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 62. The protection plate 40 is arranged on the side of the top sealing edge 231 away from the top wall 211.

[0097] The first connecting piece 52 includes a first connecting piece 521, a second connecting piece 522, and a third connecting piece 523. The first connecting piece 521 is connected to the side of the protection plate 40 facing the first portion 233A. The first connecting piece 521 includes a first region 521A and a second region 521B. When viewed along 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 extension 62, so as to increase the connection area of the first connecting piece 521 and the protection plate 40, thereby improving the structural stability and current-carrying capacity of the first connecting piece 521 and the protection plate 40. The second connecting piece 522 is located on the side of the second extension 62 away from the second region 521B. When viewed along the third direction Z, the projection of the second connecting piece 522 is located within the projection range of the first wall 221. The third connecting piece 523 is connected between the second connecting piece 522 and the second region 521B. The third connecting piece 523, the second connecting piece 522, and the second region 521B form a U-shaped structure. The second extension 62 extends into the space between the second region 521B and the second connecting piece 522 and is connected to the first connecting piece 52, thereby improving the stability of the electrical connection between the adapter tab 3 and the circuit board assembly 2.

[0098] Optionally, the first connecting piece 52 is made of a nickel sheet.

[0099] Please refer to FIG. 7 and FIG. 8, 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, and the projection of the third portion 233D is located within the projection range of the first wall 221 along the second direction Y, 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, and the second portion 233B and the third portion 233D are bent towards the same direction as the first side sealing edge 232 along the second direction Y. The third portion 233D can block impurities from interfering with the second extension segment 62 and the first connecting piece 52 along the second direction Y, thereby improving the stability of the electrical connection between the adapter tab 3 and the circuit board assembly 2.

[0100] Please refer to FIG. 9, in some embodiments, the battery 100B further comprises a first insulating piece 94 and a second insulating piece 95. The first insulating piece 94 is bonded to the side of the top sealing edge 231 away from the top wall 211, and the first insulating piece 94 further 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 piece 95 is bonded to both sides of the first sub-portion 2331 along the first direction X and both sides of the third portion 233D along the second direction Y, so as to improve the insulation stability of the first corner sealing edge 233 and the external environment.

[0101] In some embodiments, the battery 100B further comprises a third insulating piece 96 bonded between the first insulating piece 94 and the protection plate 40, and the third insulating piece 96 further covers the second connecting piece 522, so as to improve the structural stability and insulation stability of the top sealing edge 231 and the circuit board assembly 2.

[0102] Please refer to FIG. 10, in some embodiments, the battery 100B further comprises a fourth insulating piece 97 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 fourth insulating piece 97. When viewed along the third direction Z, the fourth insulating piece 97 extends to the second side wall 213 and the third side wall 214 on both sides along the first direction X, respectively, and the fourth insulating piece 97 extends to both sides of the base plate 41 along the second direction Y and covers the adapter tab 3. The fourth insulating piece 97 is used to protect the head of the battery 100B, and improve the structural stability between the battery cell 1 and the circuit board assembly 2.

[0103] Optionally, the fourth insulating piece 97 is further connected to the corresponding second insulating piece 95 on at least one side along the second direction Y, so as to further protect the head of the battery 100B.

[0104] In addition to the above differences, the battery 100B has substantially the same parameters as the battery 100A, and reference can be made to the above description of the battery 100A.

[0105] Embodiment Three

[0106] Referring to FIGS. 11 and 12, an embodiment of the present application further provides a battery 100C. The battery 100C differs from the battery 100B in that the structure of the circuit board assembly 2 is different.

[0107] The circuit board assembly 2 includes a protection plate 40 and a fourth connecting piece 55. The fourth connecting piece 55 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 sealing edge 231 away from the top wall 211.

[0108] 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. In the third direction Z, the projection of the fifth region 551A overlaps the projection of the second sub-portion 2332, and 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 segment 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. Among them, the second conductive sheet 552 is smaller in area than the first conductive sheet 551 as a patch area connected to the protection plate 40, so as to reduce the risk of interference of the fourth connecting piece 55 with the punched or circuit area on the protection plate 40. The first conductive sheet 551 is larger in area than the second conductive sheet 552 as a welding area connected to the second extension segment 62, so as to facilitate the welding of the second extension segment 62 to the sixth region 551B by a welding tool.

[0109] In some embodiments, the fourth connecting piece 55 is made of a nickel sheet.

[0110] In some embodiments, the substrate 41 is disposed on the side of the top seal 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 seal 231. Specifically, the flexible circuit board 42 comprises 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 extends out of the substrate 41 along the second direction Y. The second segment 422 is bent relative to the first segment 421 and is 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 main board of an external terminal device or other external circuit.

[0111] In some embodiments, the protection plate 40 further comprises a reinforcing plate 43 connected to the side of the first segment 421 facing the third segment 423, and 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 to reinforce the area where the protection plate 40 is connected to the fourth connecting piece 55.

[0112] In some embodiments, the protection plate 40 comprises two flexible circuit boards 42 connected to the two sides of the substrate 41 in the second direction Y, respectively, so as to improve the current carrying capacity of the protection plate 40.

[0113] In addition to the above differences, the parameters of the battery 100C are substantially the same as those of the battery 100B, and the description of the battery 100B above can be referred to.

[0114] Embodiment Four

[0115] Please refer to FIG. 13 and FIG. 14, an embodiment of the present application further provides a battery 100D. The battery 100D is different from the battery 100A in the structure of the battery cell 1, and the structure of the circuit board assembly 2 and the adapter tab 3 is also adjusted according to the battery cell 1.

[0116] 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 obliquely arranged relative to the first end surface 111 and the first side surface 112, and an 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 between 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 between the inner tab 12 and the adapter tab 3. By limiting 110°≤a≤150°, it is conducive to accommodating the connection between the inner tab 12 and the adapter tab 3.

[0117] Optionally, a is one of 110°, 115°, 120°, 125°, 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139°, 140°, 145°, 150° and any other value within the range of 110°≤a≤150°.

[0118] Further, 130°≤a≤140°, so as to further facilitate accommodating the connection between the inner tab 12 and the adapter tab 3.

[0119] The first sealing portion 22 comprises a third wall 223, one side of the third wall 223 being connected to the second side wall 213, and the other side of the third wall 223 being connected to the third side wall 214. The third wall 223 and the third inner surface 113C are oppositely arranged along a direction perpendicular to the third inner surface 113C, and a space formed between the third wall 223 and the third inner surface 113C accommodates the inner tab 12 and part of the adapter tab 3, so as to facilitate accommodating the connection between the inner tab 12 and the adapter tab 3. A 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.

[0120] Optionally, along a direction parallel to the third inner surface 113C, a 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.

[0121] In the battery 100D, an included angle a between the third inner surface 113C and the first end surface 111 satisfies 110°≤a≤150°, and 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 for accommodating the inner tab 12 and the partial adapter tab 3 is formed between the third wall 223 and the third inner surface 113C, so as to accommodate the connection part of the inner tab 12 and the adapter tab 3, and the connection part of 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 part of the inner tab 12 and the adapter tab 3 sharing the space in the third direction Z with the tab group 11, thereby improving the energy density of the battery 100D.

[0122] Please refer to FIG. 13 and FIG. 15, in some embodiments, the third wall 223 includes a second side edge 223A away from the third inner surface 113C in a direction perpendicular to the third inner surface 113C. The first angle sealing edge 233 includes a fourth part 233E, a fifth part 233F and a sixth part 233G. The fourth part 233E and the fifth part 233F are arranged at intervals, and the sixth part 233G is connected between the fourth part 233E and the fifth part 233F, and the sixth part 233G is connected to the second side edge 223A. The fourth part 233E is connected to the top sealing edge 231, and the projection of the fourth part 233E in the third direction Z is located within the projection of the first sealing part 22. The fifth part 233F is connected to the first side sealing edge 232, and the projection of the fifth part 233F in the second direction Y is located within the projection of the first sealing part 22. The adapter tab 3 extends out of the packaging bag 20 from the sixth part 233G, so as to electrically connect the adapter tab 3 with the circuit board assembly 2 arranged on the top wall 211. Correspondingly, part of the tab adhesive 30 is located in the sixth part 233G, and the other part of the tab adhesive 30 is located outside the sixth part 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 part 233G.

[0123] 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 oppositely arranged with the top wall 211 in the third direction Z, and the fourth part 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 part 233E in the third direction Z, improve the head space utilization rate of the battery 100D, and further improve the energy density of the battery 100D.

[0124] 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, and the fifth portion 233F of the first side seal 232 is bent towards the same direction, so as to reduce the space occupied by the first side seal 232 and the fifth portion 233F along the second direction Y, and improve the energy density of the battery 100D.

[0125] Please refer to FIG. 15 and FIG. 16 together, in some embodiments, the second side edge 223A extends along a direction parallel to the third inner surface 113C when viewed along the first direction X. The sixth portion 233G extends along a direction perpendicular to the third inner surface 113C, and the sixth portion 233G seals the part of the adapter tab 3 and the adapter tab 3 in the sixth portion 233G do not need to be bent synchronously with the top seal 231 or the first side seal 232, so as to reduce the risk of poor sealing caused by bending of the first corner seal 233, and reduce the risk of damage to the tab adhesive 30 in the first corner seal 233 caused by bending, improve the stability of the sealing of the adapter tab 3 and the first corner seal 233, and further improve the safety of the battery 100D.

[0126] Specifically, the third wall 223 includes a second edge 223B connected to the second side wall 213, and a third edge 223C connected to 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 between the second side edge 223A and the second edge 223B, and a fourth sub-wall 223E between the second side edge 223A and the third edge 223C. When viewed along a direction parallel to the third inner surface 113C, the third sub-wall 223D and / or the fourth sub-wall 223E are bevels or arcs, the bevels are arranged obliquely relative to the third inner surface 113C, the axes of the arcs extend 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.

[0127] Please refer to FIG. 14 again, in some embodiments, the part of the inner tab 12 in the first sealing part 22 extends along 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 part 22.

[0128] Please refer to FIG. 15 and FIG. 16 together, in some embodiments, the adapter tab 3 extends out of the packaging bag 20 from the sixth portion 233G along a direction perpendicular to the third inner surface 113C, so as to cover part of the adapter tab 3 with the tab adhesive 30.

[0129] Please refer to Fig. 15 again. In some embodiments, the circuit board assembly 2 further 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 along the second direction Y with a spacing. The second connecting member 53 comprises a fourth connecting sheet 531, a fifth connecting sheet 532 and a sixth connecting sheet 533. The fourth connecting sheet 531 is connected to the protection plate 40 and arranged opposite to the protection plate 40 along the third direction Z, so as to increase the connection area of the fourth connecting sheet 531 and the protection plate 40 and improve the stability of the connection between the fourth connecting sheet 531 and the protection plate 40. The fifth connecting sheet 532 is connected to the adapter tab 3 and arranged opposite to the adapter tab 3 along the first direction X, so as to increase the connection area of the fifth connecting sheet 532 and the adapter tab 3 and improve the stability of the connection between the fifth connecting sheet 532 and the adapter tab 3. The sixth connecting sheet 533 has two ends connected to the fourth connecting sheet 531 and the fifth connecting sheet 532 respectively, so as to adjust the angle between the fourth connecting sheet 531 and the fifth connecting sheet 532.

[0130] Please refer to Fig. 15 again. In some embodiments, the battery 100D 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.

[0131] Please refer to Fig. 17. The battery 100D 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. When viewed along the third direction Z, the sixth insulating member 99 extends to the second side wall 213 and the third side wall 214 on both sides in the first direction X, and the sixth insulating member 99 extends to the base plate 41 on both 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 100D and improve the structural stability between the battery cell 1 and the circuit board assembly 2.

[0132] Optionally, the sixth insulating member 99 also covers the corresponding fifth part 233F on at least one side in the second direction Y, so as to further protect the head of the battery 100D.

[0133] In addition to the above differences, the parameters of the battery 100D are substantially the same as those of the battery 100A, and the description of the battery 100A can be referred to.

[0134] Embodiment five

[0135] Please refer to Figs. 18 and 19. An embodiment of the present application further provides a battery 100E. The battery 100E is different from the battery 100D in that the structure of the adapter tab 3 is different, and the structure of the circuit board assembly 2 is also adjusted adaptively according to the adapter tab 3.

[0136] 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 in the third direction Z from the sixth portion 233G, so as to shorten the extension path of the adapter tab 3 to the circuit board assembly 2.

[0137] In the above battery 100E, the connection between the inner tab 12 and the adapter tab 3 is located at the corner of the packaging bag 20, which is conducive to the connection between the inner tab 12 and the adapter tab 3 sharing the space in the third direction Z with the tab group 11, thereby improving the energy density of the battery 100E. The adapter tab 3 extends out of the packaging bag 20 in the third direction Z from the sixth portion 233G, so as to shorten the extension path of the adapter tab 3 to the circuit board assembly 2.

[0138] Please refer to FIG. 18 and FIG. 20, 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 in the third direction Z from the sixth portion 233G, 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.

[0139] The circuit board assembly 2 includes 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 includes 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 includes a third area 541A and a fourth area 541B. In the third direction Z, the projection of the third area 541A overlaps the projection of the fourth portion 233E, and the projection of the fourth area 541B overlaps the projection of the fourth extension segment 64, so as to increase the connection area of the seventh connecting piece 541 with the protection plate 40, and improve the structural stability and current-carrying capacity of the seventh connecting piece 541 with the protection plate 40. The eighth connecting piece 542 is located on the side of the fourth extension segment 64 away from the fourth area 541B, and 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 area 541B, and the ninth connecting piece 543, the eighth connecting piece 542, and the fourth area 541B form a U-shaped structure. The fourth extension segment 64 extends into the space between the fourth area 541B and the eighth connecting piece 542 and is connected with 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.

[0140] Optionally, the third connecting piece 54 is made of a nickel sheet.

[0141] In addition to the above differences, the battery 100E has substantially the same parameters as the battery 100D, and the description of the battery 100D above can be referred to.

[0142] Referring to FIG. 21, the application also provides a terminal device 200 comprising the battery (100A, 100B, 100C, 100D, 100E) of any of the above embodiments.

[0143] 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, an electric tool, or the like.

[0144] In summary, in the battery (100A, 100B, 100C, 100D, 100E) and the 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 a corner of the packaging bag 20. By connecting one end of the adapter tab 3 to 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 of the packaging bag 20, which is conducive to the connection between the inner tab 12 and the adapter tab 3 sharing the space in the third direction Z with the tab group 11, thereby improving the energy density of the battery (100A, 100B, 100C, 100D, 100E).

[0145] In addition, those skilled in the art can make other changes within the spirit of the application, and of course, these changes made according to the spirit of the application should be included in the scope disclosed by the 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 portion, a first sealing portion and a sealing portion, the main body portion comprising a top wall and a first side wall, the top wall being oppositely arranged to the first end face, the first side wall being oppositely arranged to the first side face, the first sealing portion being connected between the top wall and the first side wall, a projection of the first sealing portion being located between the top wall and the first side wall along the second direction, a projection of the first sealing portion being located between the top wall and the first side wall along the third direction, the inner tab being located in the first sealing portion, the sealing portion 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 portion, the top sealing edge and the first side sealing edge; A circuit board assembly being arranged on the top wall; An adapter tab, one end of the adapter tab being located in the first sealing portion and connected to the inner tab, the other end of the adapter tab extending out of the first corner sealing edge and being electrically connected to the circuit board assembly.

2. The battery of claim 1, wherein, As viewed along the first direction, the first concave face comprises a first inner face and a second inner face connected to the first inner face, the first inner face being connected to the first side face and extending along the second direction, the second inner face being connected to the first end face and extending along the third direction; The first sealing portion 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 face along the second direction, the first wall being connected between the second wall and the top wall, a space being formed between the first wall and the second wall for accommodating the inner tab and the adapter tab; The first corner sealing edge comprises a first part and a second part being 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.

3. The battery of claim 2, wherein the cathode is a lithium cobalt oxide cathode. The first wall comprises a first side edge away from the first inner face along the third direction, the first side edge extending along the second direction and being arranged side by side with the top wall along the second direction, the first part being connected to the first side edge; The top sealing edge is bent towards the top wall, the top sealing edge being located between the circuit board assembly and the top wall, the top sealing edge being oppositely arranged to the top wall along the third direction, the first part being bent towards the same direction as the top sealing edge.

4. The battery of claim 2, wherein the cathode comprises a lithium metal oxide. 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, and the first sub-portion is located between the second portion and the top wall in the second direction, 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; 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 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 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. As viewed along the third direction, the second sub-rubber and the second sub-portion are spaced apart along the second direction.

8. The battery of any of claims 6-7, 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, as viewed along 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 of any of claims 4-8, wherein the cathode comprises a cathode active material and a cathode binder, and the anode comprises an anode active material and an anode binder. The first corner seal edge further comprises a third portion connected between the second portion and the first sub-portion; The first side seal is bent towards the first side wall, the first side seal and the first side wall are oppositely arranged along the second direction, and the second portion, the third portion and the first side seal 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 two sides of the top seal The first insulating member further covers the second sub-portion and extends from the second sub-portion towards the first side edge, and the second insulating member is bonded to two sides of the first sub-portion along the first direction and two sides of the third portion along the second direction.

10. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. In the first direction, the first concave surface comprises a third inner surface connected between the first end surface and the first side surface, the third inner surface is oppositely arranged relative to the first end surface and the first side surface, and 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 oppositely arranged with the third inner surface along 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 seal 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 seal comprises a fourth portion, a fifth portion and a sixth portion, the fourth portion and the fifth portion are spaced apart, 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 seal edge, and in the third direction, a projection of the fourth portion is located within a projection of the first sealing portion, the fifth portion is connected to the first side seal, and in the second direction, a projection of the fifth portion is located within the projection of the first sealing portion. 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 seal edge is bent towards the top wall, and 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, and the fourth portion is bent towards the same direction as the top seal edge.

13. The battery of claim 12, wherein the cathode comprises a lithium metal oxide. In 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 the side of the top sealing edge away from the top wall, the protection plate and the adapter tab are arranged in the second direction, the second connecting member comprises a fourth connecting piece, a fifth connecting piece and a sixth connecting piece, the fourth connecting piece is connected to the protection plate and arranged opposite to the protection plate in the third direction, the fifth connecting piece is connected to the adapter tab and arranged opposite to the adapter tab in the first direction, and the sixth connecting piece is connected to the fourth connecting piece and the fifth connecting piece at both ends.

15. The battery of claim 12, wherein the cathode comprises a lithium metal oxide. In the first direction, the second side edge extends in a direction parallel to the third inner surface, and the sixth part extends in a direction perpendicular to the third inner surface. The adapter tab extends out of the packaging bag in the third direction from the sixth part.

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 in the second direction, the third extension extends out of the packaging bag in the third direction from the sixth part, 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 member, the protection plate is arranged on the side of the top sealing edge away from the top wall, the third connecting member 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 area and a fourth area, in the third direction, the projection of the third area overlaps the projection of the fourth part, and the projection of the fourth area overlaps the projection of the fourth extension, the eighth connecting piece is located on the side of the fourth extension away from the fourth area, and the ninth connecting piece is connected between the eighth connecting piece and the fourth area, and the fourth extension extends into the fourth area and the eighth connecting piece.

17. The battery of any one of claims 11 to 16, wherein the cathode comprises a lithium metal oxide. The first side sealing edge is bent towards the first side wall, the first side sealing edge and the first side wall are arranged opposite in the second direction, and the fifth part 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 part extends in 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: The battery comprises the battery as claimed in any one of claims 1 to 19.

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