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CN-122026012-A - Battery cell

CN122026012ACN 122026012 ACN122026012 ACN 122026012ACN-122026012-A

Abstract

The invention belongs to the technical field of batteries, and particularly discloses a battery. The plastic part of the cover plate component is provided with a positioning column. The second connecting plate of the connecting sheet is electrically connected with the lugs of the pole group, the first connecting plate of the connecting sheet is provided with a positioning hole, and the positioning column penetrates through the positioning hole. Along a first direction, one end of the positioning column, which is far away from the plastic part, forms a lap joint part through hot melting, and the lap joint part compresses the first connecting plate on the plastic part. Through the cooperation of locating column and locating hole on the first connecting plate, realized the stable fixed between connection piece and the plastic part. When bending the second connecting plate relative to the first connecting plate, the first connecting plate of the connecting sheet can be stably fixed with the plastic part, the first connecting plate cannot be pulled to bend to the side where the pole group is located, the arrangement space of the pole lugs cannot be compressed, the shape of the pole lugs in the shell is good, and the situation that the pole lugs are in contact short circuit or torn is avoided.

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 polar column, wherein the polar column penetrates through the cover plate body and the plastic part, and a positioning column is arranged on the end face of one side of the plastic part, which is away from the cover plate body; 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, away from the second connecting plate, of the first connecting plate is connected with the plate body of the pole column, a positioning hole is formed in one end, close to the second connecting plate, of the first connecting plate, the positioning column penetrates through the positioning hole, one end, away from the plastic part, of the positioning column is in the first direction, a lap joint part is formed through hot melting, and the periphery of the lap joint part is abutted with the first connecting plate in the circumferential direction of the positioning hole so as to tightly press the first connecting plate to the plastic part.
  2. 2. The battery of claim 1, wherein the first connecting plate has a thickness t and the overlap has a thickness k in the first direction; Wherein the relation between k and t is more than or equal to 0.6 and less than or equal to 3.0; k is more than or equal to 0.3mm and less than or equal to 9.0mm; the value range of t is more than or equal to 0.5mm and less than or equal to 3.0mm.
  3. 3. The battery of claim 2, wherein a distance between an outer peripheral wall of the lap portion and an outer peripheral wall of the positioning post in the second direction is e; e. The relation between k is satisfied that e/k is more than or equal to 0.6 and less than or equal to 1.2; the value range of e is that e is more than or equal to 0.18mm and less than or equal to 10.8mm.
  4. 4. The battery according to claim 1, wherein the connecting piece comprises a transition part, two ends of the transition part are respectively connected with the first connecting plate and the second connecting plate, after the second connecting plate is bent relative to the first connecting plate, the second connecting plate is parallel to the first connecting plate, and the connecting piece forms a bending section at the transition part; along a first direction, the distance between the end surface of the lap joint part, which is far away from the plastic part, and the end surface of the second connecting plate, which is far away from the pole group, is g; the value range of g is more than or equal to 0mm and less than or equal to 5mm.
  5. 5. The battery of claim 4, wherein the first connecting plate comprises an electric connecting section, an inclined section and a fixed section which are sequentially connected, wherein the electric connecting section is attached to and connected with the plate body part of the pole, a positioning hole is formed in the fixed section, the inclined section is in transitional connection with the electric connecting section and the fixed section, and a height difference is formed between the electric connecting section and the fixed section along a first direction; The width of the fixing section is m along the second direction, and the distance between the outer peripheral wall of the positioning column and the outer wall of one side of the bending section, which is away from the lap joint part, is w; The relation between m and w is satisfied that w/m is more than or equal to 0.3 and less than or equal to 0.5; m is more than or equal to 5mm and less than or equal to 40mm; the value range of w is that w is more than or equal to 1.5mm and less than or equal to 20mm.
  6. 6. The battery according to claim 4, wherein a distance between an end of the bent section adjacent to the first connecting plate and an outer peripheral wall of the lap portion in the second direction is f; the value range of f is that f is more than or equal to 0.5mm and less than or equal to 10mm.
  7. 7. The battery according to claim 1, wherein the volume of the portion of the positioning column located at the side of the first connecting plate away from the plastic part is S1, the lap joint part is formed by hot-pressing one end of the positioning column away from the plastic part by a hot-melting pressure head, and the volume of a cavity of the hot-melting pressure head is S2; the relation between S1 and S2 satisfies that S1/S2 is more than or equal to 0.8 and less than or equal to 1.3.
  8. 8. The battery according to claim 7, wherein an included angle beta is formed between an end surface of the lap joint part on the side facing away from the plastic part and the peripheral wall of the lap joint part; The value range of beta is 93 degrees or more and 110 degrees or less.
  9. 9. The battery of claim 7, wherein a heat source of the hot melt ram is located at a bottom wall of the cavity, the heat source being opposite an end of the positioning post facing away from the molded part in a first direction.
  10. 10. The battery according to claim 1, wherein a support table is provided on an end face of the plastic member facing away from the cover plate body, the support table is connected to an outer peripheral wall of the positioning column near one end of the plastic member, and an end face of the support table facing the pole group abuts against an end face of the first connecting plate near the plastic member.

Description

Battery cell Technical Field The invention relates to the technical field of batteries, in particular to a battery. Background With the increasing maturity of lithium ion battery technology, the lithium ion battery is widely applied to the electric automobile and the energy storage field as a power battery, and the requirements on the usability and the safety of the lithium ion battery are increasing. A traditional quadrapole lug square lithium battery is characterized in that two pole groups are packaged inside a shell through a cover plate assembly and a shell body in a welded sealing mode, positive pole lugs of the pole groups are connected with positive pole connecting pieces, negative pole lugs are connected with negative pole connecting pieces, and then the positive pole connecting pieces and the negative pole connecting pieces are welded with a pole column bottom plate on the cover plate assembly to form positive pole columns and negative pole columns outside an electric core. The positive electrode side and the negative electrode side of the traditional quadrapole lug square lithium battery structure are respectively provided with a positive electrode connecting sheet and a negative electrode connecting sheet, the positive electrode connecting sheet is welded with positive electrode lugs of two electrode groups, and the negative electrode connecting sheet is welded with negative electrode lugs of two electrode groups. And then the positive electrode connecting sheet and the negative electrode connecting sheet are bent to realize the closing of the electrode group and the cover plate. In the bending process, 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 dragged 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 moves downwards, the bending space of the electrode lug is compressed, the electrode lug is poor in shape, the risk of short circuit between the inside of the inverted insertion electrode group and the electrode plate contact exists, and wrinkles are generated along with the fact that the electrode lug is pressed, so that the risk of tearing the electrode lug is caused. Disclosure of Invention The invention aims to provide a battery, wherein a positioning effect of a connecting sheet on a cover plate assembly is good, the connecting sheet is not easy to warp when being bent, a bending space of a tab is abundant, the shape of the tab in the battery is good, and the risks of contact short circuit and crush injury and tearing are avoided. 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 polar column, wherein the polar column penetrates through the cover plate body and the plastic part, and a positioning column is arranged on the end face of one side of the plastic part, which is away from the cover plate body; 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, away from the second connecting plate, of the first connecting plate is connected with the plate body of the pole column, a positioning hole is formed in one end, close to the second connecting plate, of the first connecting plate, the positioning column penetrates through the positioning hole, one end, away from the plastic part, of the positioning column is in the first direction, a lap joint part is formed through hot melting, and the periphery of the lap joint part is abutted with the first connecting plate in the circumferential direction of the positioning hole so as to tightly press the first connecting plate to the plastic part. Optionally, in the first direction, the thickness of the first connecting plate is t, and the thickness of the lap joint part is k; Wherein the relation between k and t is more than or equal to 0.6 and less than or equal to 3.0; k is more than or equal to 0.3mm and less than or equal to 9.0mm; the value range of t is more than or equal to 0.5mm and less than or equal to 3.0mm. Optionally, in the second direction, a distance between the outer peripheral wall of the overlap portion and the outer peripheral wall of the positioning post is e; e. The relation between k is satisfied that e/k is more than or equal to 0.6 and less than or equal to 1.2; the value range of e is that e is more than or equal to 0.18mm and less than or equal to 10.8mm. Optionally, the connecting piece comprises a transition part, and two ends of the transition part are respectively connected with t