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CN-122026013-A - Battery cell

CN122026013ACN 122026013 ACN122026013 ACN 122026013ACN-122026013-A

Abstract

The invention belongs to the technical field of batteries, and particularly discloses a battery. The cover plate assembly comprises a cover plate body, a plastic part and a pole, wherein the pole penetrates through the cover plate body and the plastic part. One side of the plastic part, which is far away from the cover plate body the end face of the upper part is provided with a positioning column. The connection piece includes first connecting plate and second connecting plate, and the second connecting plate is connected with the utmost point ear, and the one end that the second connecting plate was kept away from to first connecting plate is connected with the plate body portion of utmost point post. One end of the first connecting plate, which is close to the second connecting plate, is provided with a positioning hole, a guiding part of the positioning column penetrates through the positioning hole and then stretches out of the plastic part, and a body part of the positioning column at least partially penetrates through the positioning hole. Through the cooperation of reference column and locating hole for location between mould piece and the connection piece is accurate, avoids the connection piece to take place the skew at battery use, and the connection piece is difficult for leading to the short circuit with the casing overlap joint, and the security performance of battery is good.

Inventors

  • LIU JIE
  • WANG ZHENG
  • JIANG ZHEN

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 post, wherein the polar post penetrates through the cover plate body and the plastic part, and a positioning post 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, 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 part of the pole column, one end, close to the second connecting plate, of the first connecting plate is a fixed section, a positioning hole is formed in the fixed section, one end, away from the body part, of the guide part penetrates through the positioning hole and then stretches out of the plastic part, and at least part of the body part penetrates into the positioning hole; The distance between the end face of the guide part, which is away from the plastic part, and the end face of the fixing section, which is away from the plastic part, is a along the first direction, and the thickness of the first connecting plate is t; The value range of a is that a is more than or equal to 1.0mm and less than or equal to 10.0mm; the value range of t is more than or equal to 0.5mm and less than or equal to 3.0mm.
  2. 2. The battery according to claim 1, wherein the guide part is in a shape of a circular truncated cone, the bottom surface of the guide part is connected with the body part, the top surface of the guide part is used for being assembled with the positioning hole, and the circumferential side surface of the guide part is a guide surface; the height of the bus extending along the first direction is x, and the width of the bus extending along the second direction is y; the relation between x and y is satisfied that y/x is more than or equal to 0.3 and less than or equal to 1.0; x is more than or equal to 0.5mm and less than or equal to a+t/2; y is more than or equal to 0.15mm and less than or equal to 11.5mm.
  3. 3. The battery of claim 1, wherein the body portion is cylindrical and has a diameter phid; The relation between phid and t is satisfied that phid/t is not less than 1.0 and not more than 5.0; the value range of phid is 0.5 mm-15mm.
  4. 4. The battery of claim 1, wherein in the second direction, the positioning hole has a size e; The relation between phid and e is satisfied that phid/e is more than or equal to 0.6 and less than or equal to 0.9; The value range of e is that e is more than or equal to 0.8mm and less than or equal to 16.7mm.
  5. 5. The battery according to claim 1, wherein the positioning posts and the positioning holes are provided in plurality, the positioning posts are in one-to-one correspondence with the positioning holes, the positioning posts are arranged at intervals along a third direction on the end face of the plastic part facing the pole group side, the positioning holes are arranged at intervals along the third direction on the fixing section, and at least one positioning hole is a kidney-shaped hole extending along the third direction.
  6. 6. 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 fixed section and the second connecting plate, the connecting piece is bent along a central line in the length direction of the transition part, the central line extends along a third direction so as to enable the second connecting plate to be bent relative to the first connecting plate, the second connecting plate is parallel to the first connecting plate after bending, and the connecting piece forms a bending section at the transition part; along a second direction, the distance between the edge of one side of the positioning hole far away from the pole and the central line in the length direction of the transition part is f; f. the relation between t is satisfied that f/t is not less than 1.5 and not more than 5; The value range of f is more than or equal to 0.5mm and less than or equal to 20.0mm.
  7. 7. The battery according to claim 6, wherein before the connecting piece is bent along the center line in the length direction of the transition portion, the guide portion is formed into a lap portion by thermal fusion, and the periphery of the lap portion abuts against the first connecting plate in the circumferential direction of the positioning hole to press the first connecting plate against the plastic member; After the connecting sheet is bent along the central line of the transition part in the length 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 along the first direction; the value range of g is more than or equal to 0mm and less than or equal to 5mm.
  8. 8. The battery of claim 7, 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, 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 positioning hole, which is close to the inclined section, is E along the second direction; e is more than or equal to 0.2mm and less than or equal to 20.0mm.
  9. 9. The battery according to claim 1, wherein a support stand is provided on an end face of the plastic member facing away from the cover plate body, the support stand is connected to an outer peripheral wall of the body portion near one end of the plastic member, and an end face of the support stand facing the pole group is abutted against an end face of the first connecting plate near the plastic member.
  10. 10. The battery of claim 9, wherein the support table has a height c in the first direction; The value range of c is that c is more than or equal to 0.2mm and less than or equal to 10.0mm; and/or, along the second direction, the width of the contact surface of the supporting table and the first connecting plate is b; The value range of b is that b is more than or equal to 0.4mm and less than or equal to 10.0mm.

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. In a traditional square lithium battery, two pole groups are packaged inside a shell through a cover plate assembly and a shell body in a welding and sealing mode, pole lugs of the pole groups are connected with connecting pieces, and then the connecting pieces are welded with a pole column bottom plate on the cover plate assembly to form pole columns outside a battery core. However, when the connection piece is assembled with the cover plate assembly and the electrode, the connection piece is lack of an effective positioning structure for positioning, so that the position of the connection piece is easy to deviate in the subsequent use process of the battery, and particularly when the battery is collided or impacted, if the position of the connection piece is inclined, the connection piece and the shell can be possibly caused to overlap short-circuited, and the safety performance of the battery is poor. Disclosure of Invention The invention aims to provide a battery, wherein the positioning precision of a connecting sheet in the battery is higher, the probability of the inclined appearance of the connecting sheet is low, the problem of contact short circuit is not easy to occur, and the safety performance 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 polar post, wherein the polar post penetrates through the cover plate body and the plastic part, and a positioning post 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, 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 part of the pole column, one end, close to the second connecting plate, of the first connecting plate is a fixed section, a positioning hole is formed in the fixed section, one end, away from the body part, of the guide part penetrates through the positioning hole and then stretches out of the plastic part, and at least part of the body part penetrates through the positioning hole; The distance between the end face of the guide part, which is away from the plastic part, and the end face of the fixing section, which is away from the plastic part, is a along the first direction, and the thickness of the first connecting plate is t; The value range of a is that a is more than or equal to 1.0mm and less than or equal to 10.0mm; the value range of t is more than or equal to 0.5mm and less than or equal to 3.0mm. Optionally, the guiding part is in a shape of a circular truncated cone, the bottom surface of the guiding part is connected with the body part, the top surface of the guiding part is used for being assembled with the positioning hole, and the circumferential side surface of the guiding part is a guiding surface; the height of the bus extending along the first direction is x, and the width of the bus extending along the second direction is y; the relation between x and y is satisfied that y/x is more than or equal to 0.3 and less than or equal to 1.0; x is more than or equal to 0.5mm and less than or equal to a+t/2; y is more than or equal to 0.15mm and less than or equal to 11.5mm. Optionally, the body portion is cylindrical, and the diameter of the body portion is phid; The relation between phid and t is satisfied that phid/t is not less than 1.0 and not more than 5.0; the value range of phid is 0.5 mm-15mm. Optionally, in the second direction, the positioning hole has a size e; The relation between phid and e is satisfied that phid/e is more than or equal to 0.6 and less than or equal to 0.9; The value range of e is that e is more than or equal to 0.8mm and less than or equal to 16.7mm. Optionally, the positioning columns and the positioning holes are all provided with a plurality of positioning columns, the positioning columns and the positioning holes are in one-to-one correspondence, the positioning columns are arranged at intervals along a third direction on the end face of the plastic part facing to one side of the pole group, the positioning holes are arranged at intervals along the third direction on the fixed section, and at least one positioning hole is a kidney-shaped hole which extends along the third direction. The connect