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CN-122026014-A - Battery cell

CN122026014ACN 122026014 ACN122026014 ACN 122026014ACN-122026014-A

Abstract

The invention belongs to the technical field of batteries, and particularly discloses a battery. In the cover plate assembly, the pole is penetrated in the cover plate body and the plastic part, the second connecting plate of the connecting sheet is connected with the pole lug of the pole group, and the first connecting plate of the connecting sheet is connected with the plate body of the pole. The first connecting plate is detachably connected with the end face of one side, close to the pole group, of the plastic part through a fixing structure. Therefore, the first connecting plate and the plastic part can be stably fixed, the first connecting plate is prevented from tilting and uneven when the connecting sheet is bent, and the problems of crush injury and tearing of the tab are relieved. The first connecting plate is provided with a convex hull, and the convex hull protrudes towards one side far away from the plastic part along the first direction. Can increase the mechanical strength of first connecting plate through the convex closure, further guarantee that first connecting plate can not take place to warp, unevenness relatively to mould the piece, can also avoid the connection piece to adorn simultaneously and turn over, prevent that the burr on connection piece reverse side from damaging the utmost point ear, promoted reliability, the security of battery.

Inventors

  • LIU JIE

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. A battery, comprising: The electrode assembly is provided with an electrode lug at one end; The cover plate assembly comprises a cover plate body, a plastic part and a pole, wherein the plastic part is arranged on one side of the cover plate body along a first direction, and the pole penetrates through the cover plate body and the plastic part; The connecting piece comprises a first connecting plate and a second connecting plate, wherein the second connecting plate is connected with the pole lug, one end, far away from the second connecting plate, of the first connecting plate is connected with the plate body of the pole column, the first connecting plate is detachably connected with the end face, close to one side of the pole group, of the plastic part through a fixing structure, a convex hull is arranged on the first connecting plate, and the convex hull protrudes towards one side, far away from the plastic part, along a first direction.
  2. 2. The battery of claim 1, wherein the fixing structure comprises a positioning column and a positioning hole, the positioning column is connected to the end face of the plastic part, which is away from one side of the cover plate body, the positioning hole is formed in one end of the first connecting plate, which is close to the second connecting plate, and the positioning column penetrates through the positioning hole, one end of the positioning column, which is far away from the plastic part, is in a first direction, and an overlapping part is formed by hot melting, and the periphery of the overlapping part is abutted with the first connecting plate in the circumferential direction of the positioning hole so as to compress the first connecting plate on the plastic part.
  3. 3. The battery according to claim 2, wherein a plurality of positioning posts and positioning holes are provided, and the positioning posts are in one-to-one correspondence with the positioning holes; And/or a plurality of convex hulls are arranged, and the convex hulls are spaced from the positioning holes and are alternately arranged.
  4. 4. The battery of claim 3, wherein the number of the convex hulls is N, the width of the convex hulls in the second direction is d, and the width of the first connecting plate in the second direction is y; the relation among N, d and y is more than or equal to 0.3 and less than or equal to (Nxd)/y is less than or equal to 0.7; Wherein N is a positive integer; d is more than or equal to 2mm and less than or equal to 20mm.
  5. 5. The battery according to claim 3, wherein a distance between the convex hull near the side in the width direction of the first connecting plate and the adjacent side in the width direction of the first connecting plate in the second direction is e; e is more than or equal to 0.3mm and less than or equal to 10mm; And/or, along the second direction, the distance between the adjacent two convex hulls and the side close to each other is m; The value range of m is that m is more than or equal to 0.5mm and less than or equal to 10mm.
  6. 6. The battery according to claim 1, wherein the connecting piece includes a transition portion, both ends of which are respectively connected to the first connecting plate and the second connecting plate, the connecting piece being bent along a center line in a length direction of the transition portion, the center line extending in a third direction so that the second connecting plate is parallel to the first connecting plate, the connecting piece forming a bent section at the transition portion; along a third direction, the distance between the edge of the convex hull far away from one side of the pole and the bending section is k; the value range of k is that k is more than or equal to 0.5mm and less than or equal to 5mm.
  7. 7. The battery according to claim 6, wherein after the connecting piece is bent along a center line in a length direction of the transition portion, a distance between an end surface of the convex hull on a side away from the plastic part and an end surface of the second connecting plate on a side away from the pole group is g in a first direction; The value range of g is 0.1 mm-3 mm.
  8. 8. The battery according to claim 6, wherein after the connecting piece is bent along a center line in a length direction of the transition portion, a distance between an end surface of the convex hull on a side away from the plastic part and an end surface of the first connecting plate on a side away from the pole group is b, and a thickness of the first connecting plate is t; b. the relation between t is 0.5mm 2 ＜b×t≤10mm 2 ; Wherein, the value range of b is that b is more than or equal to 0.25mm and less than or equal to 5mm; the value range of t is that t is more than or equal to 0.5mm and less than or equal to 2mm.
  9. 9. The battery according to claim 2, wherein the first connecting plate comprises an electric connecting section, an inclined section and a fixed section which are sequentially connected, the electric connecting section is attached to and connected with the plate body part of the pole, the fixed section is provided with the positioning hole and the convex hull, and the inclined section is in transitional connection with the electric connecting section and the fixed section; the distance between one side of the inclined section, which is close to the fixed section, and one side of the convex hull, which is close to the inclined section, is a along a third direction; The value range of a is that a is more than or equal to 0.5mm and less than or equal to 10mm.
  10. 10. The battery of claim 9, wherein in a third direction, the convex hull has a length c and the fixed segment has a length x; c. The relation between x is satisfied that c/x is more than or equal to 0.4 and less than or equal to 0.8; Wherein, the value range of x is that x is more than or equal to 5mm and less than or equal to 20mm; The value range of c is that c is more than or equal to 2mm and less than or equal to 16mm.

Description

Battery cell Technical Field The invention relates to the technical field of batteries, in particular to a battery. Background The positive electrode side and the negative electrode side of the traditional quadrapole group square lithium battery structure are respectively provided with a positive electrode connecting sheet and a negative electrode connecting sheet. One end of the positive electrode connecting sheet is welded with the positive electrode lugs of the two electrode groups, and the other end of the positive electrode connecting sheet is welded with one of the electrode column bottom plates on the cover plate assembly to form a positive electrode column outside the battery cell. One end of the negative electrode connecting sheet is welded with the negative electrode lugs of the two electrode groups, and the other end of the negative electrode connecting sheet is welded with the bottom plate of the other electrode column on the cover plate assembly to form a negative electrode column outside the battery cell. And then the anode connecting sheet and the cathode connecting sheet are bent to realize the closing of the anode group and the cover plate, so that the anode group is put into the shell to realize the assembly of the battery. However, in the bending process of the positive electrode connecting sheet and the negative electrode connecting sheet, the surface of the positive electrode connecting sheet and the surface of the negative electrode connecting sheet, which are close to one side of the cover plate assembly, are easy to be pulled and bent, so that the welding surface of the positive electrode lug and the positive electrode connecting sheet moves downwards, the welding surface of the negative electrode lug and the negative electrode connecting sheet also moves downwards, the bending space of the electrode lug is compressed, the shape of the electrode lug is poor, the risk of short circuit caused by the contact of the inside of the inverted insertion electrode group and the electrode sheet exists, and the risk of tearing of the electrode lug is caused by sharp wrinkles along with the pressed electrode lug. And the positive connection piece and the negative connection piece adopt a symmetrical design, burrs are formed at the edges of one surfaces of the positive connection piece and the negative connection piece due to stamping during processing, if the positive connection piece and the negative connection piece are reversely assembled, the bending area of the surface of the burrs in the positive connection piece and the negative connection piece, facing the tab, is easy to cause tab cutting injury, and the safety performance of the battery is reduced. Disclosure of Invention The invention aims to provide a battery, which can avoid the occurrence of warping and unevenness when a connecting sheet is bent, the arrangement space of a tab is not compressed, the risk of the tab being crushed or torn is relieved, the connecting sheet is not easy to be reversely arranged, the tab is prevented from being damaged by burrs on the back surface of the connecting sheet, and the reliability of the battery is improved. To achieve the purpose, the invention adopts the following technical scheme: The present invention provides a battery comprising: The electrode assembly is provided with an electrode lug at one end; The cover plate assembly comprises a cover plate body, a plastic part and a pole, wherein the plastic part is arranged on one side of the cover plate body along a first direction, and the pole penetrates through the cover plate body and the plastic part; The connecting piece comprises a first connecting plate and a second connecting plate, wherein the second connecting plate is connected with the pole lug, one end, far away from the second connecting plate, of the first connecting plate is connected with the plate body of the pole column, the first connecting plate is detachably connected with the end face, close to one side of the pole group, of the plastic part through a fixing structure, a convex hull is arranged on the first connecting plate, and the convex hull protrudes towards one side, far away from the plastic part, along a first direction. Optionally, the fixing structure comprises a positioning column and a positioning hole, the positioning column is connected to the end face of the plastic part, which is away from one side of the cover plate body, the positioning hole is formed in one end of the first connecting plate, which is close to the second connecting plate, the positioning column penetrates through the positioning hole, one end of the positioning column, which is far away from the plastic part, is in hot melting along a first direction to form a lap joint part, and the periphery of the lap joint part is abutted to the first connecting plate in the circumferential direction of the positioning hole so as to compress the first connecting plate on the plastic part. Optionally, th