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CN-122000569-A - Battery cover plate and battery

CN122000569ACN 122000569 ACN122000569 ACN 122000569ACN-122000569-A

Abstract

The application relates to the technical field of power batteries, and provides a battery cover plate and a battery. The battery cover plate comprises a cover plate body with a pole mounting hole, a pole arranged in the pole mounting hole, a first insulating part, a sealing part and a second insulating part which are sequentially arranged between the cover plate body and the pole, wherein the pole comprises a column body, a base and a protruding structure, the column body is arranged in the pole mounting hole, the base is abutted on the second insulating part, the protruding structure can be turned outwards towards the radial direction of the column body and is pressed on the second insulating part, the protruding structure is provided with two flat parts and two circular arc parts which are oppositely arranged, the flat parts and the circular arc parts are sequentially connected in an annular mode, at least one circular arc part is provided with a notch, the notch extends downwards along the axial direction of the column body from the end face of the protruding structure, and the bottom wall of the notch is flush with the top end of the column body. According to the battery cover plate, the forming quality of the folded convex structure can be improved through the arranged notch.

Inventors

  • SUN CHAO

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. A battery cover plate, characterized in that: the device comprises a cover plate body with a pole mounting hole, a pole arranged in the pole mounting hole, and a first insulating piece, a sealing piece and a second insulating piece which are sequentially arranged between the cover plate body and the pole; the pole comprises a column part with a strip-shaped cross section, a base and a protruding structure, wherein the base and the protruding structure are respectively arranged at two axial ends of the column part, the column part is arranged in the pole mounting hole from one side of the pole mounting hole, the base is abutted on the second insulating part, and the protruding structure can be turned outwards towards the radial direction of the column part and is pressed on the second insulating part; The protruding structure is provided with two straight parts and two circular arc parts which are oppositely arranged, the straight parts and the circular arc parts are sequentially connected in an annular mode in an alternating mode, at least one circular arc part is provided with a notch, the notch extends downwards along the axial direction of the column body from the end face of the protruding structure, and the bottom wall of the notch is flush with the top end of the column body.
  2. 2. The battery cover plate according to claim 1, wherein: The pole has a first symmetry plane parallel to the straight portion and perpendicular to the base; the two side walls of the notch are symmetrically arranged relative to the first symmetrical plane.
  3. 3. The battery cover plate according to claim 1, wherein: On a projection plane perpendicular to the axial direction of the pole, the outer arc length of the arc part is M, the outer arc length corresponding to the projection of the notch is M, and the relation between the two is that K=m/M, and K is 33.3% or more and 66.7% or less.
  4. 4. The battery cover plate according to claim 1, wherein: The protruding structure with the terminal surface intersection position department of cylinder portion is equipped with the recess, the recess is annular along protruding structure's inboard.
  5. 5. The battery cover plate of claim 4, wherein: the dimension h of the groove in the axial direction of the pole is between 0.2mm and 0.8mm, and/or the dimension w of the root of the groove in the direction perpendicular to the axial direction of the pole is between 0.2mm and 0.5 mm.
  6. 6. The battery cover plate according to claim 1, wherein: And in the axial direction of the pole, the outer side end surface of the folded convex structure is coplanar with the top end of the column body.
  7. 7. The battery cover plate according to claim 1, wherein: the first insulating piece comprises a main body part, and a first edge and a second edge which are arranged on the main body part; The main body part is abutted with the upper surface of the cover plate body, and the folded convex structure is pressed on the main body part; The first edge is connected to the inner peripheral side of the main body part and extends downwards along the axial direction of the pole, the first edge is located between the outer surface of the column part and the hole wall of the pole mounting hole, the second edge is connected to the outer peripheral side of the main body part and extends upwards along the axial direction of the pole, and the second edge surrounds the outer peripheral side of the folded protruding structure.
  8. 8. The battery cover plate according to claim 1, wherein: A bevel part is formed on the surface of the cover plate body, which is abutted against the first insulating piece, and surrounds the circumference of the pole mounting hole and inclines from the surface of the cover plate body to the side where the first insulating piece is located; The included angle alpha between the inclined surface part and the surface of the cover plate body is more than or equal to 0 degree and less than or equal to 45 degrees.
  9. 9. The battery cover plate according to any one of claims 1 to 8, wherein: a first positioning structure is arranged between the cover plate body and the first insulating piece, and/or, And a second positioning structure is arranged between the cover plate body and the second insulating piece.
  10. 10. A battery, characterized in that: the battery is provided with the battery cover plate according to any one of claims 1 to 9.

Description

Battery cover plate and battery Technical Field The application relates to the technical field of power batteries, in particular to a battery cover plate and a battery. Background In the battery structural design, a battery cover plate is a core component for guaranteeing the sealing performance of a battery and realizing current conduction, and the performance of the battery cover plate directly influences the safety, the reliability and the service life of the battery. The battery cover plate generally comprises a cover plate body, a pole and an insulating sealing structure, wherein the assembly precision and the sealing effect of the pole and the cover plate body are particularly critical. In the related art, when the pole is assembled, the protruding structure at the end part of the pole can be folded outwards along the radial direction of the pole, so that the pole is pressed on an insulating piece through the folded protruding structure, and the relative fixation of the pole and the cover plate body is realized. However, the protruding structure is mostly annular structure, and in the process of turning over, stress on each part of the annular protruding structure is difficult to evenly distribute, and the formation defects such as inconsistent turning over angles, edge warping, local fold or rupture easily appear, so that the protruding structure after flanging cannot be smoothly pressed on an insulating part, thereby causing air leakage of a cover plate, insufficient sealing performance of the cover plate and being unfavorable for improving the preparation yield of the battery cover plate. Disclosure of Invention In view of the above, the present application is directed to a battery cover plate, which can improve the molding quality of the turnover of the protruding structure on the pole, and is beneficial to improving the manufacturing yield of the battery cover plate. In order to achieve the above purpose, the technical scheme of the application is realized as follows: A battery cover plate comprises a cover plate body with a pole mounting hole, a pole arranged in the pole mounting hole, and a first insulating piece, a sealing piece and a second insulating piece which are sequentially arranged between the cover plate body and the pole; the pole comprises a column part with a strip-shaped cross section, a base and a protruding structure, wherein the base and the protruding structure are respectively arranged at two axial ends of the column part, the column part is arranged in the pole mounting hole from one side of the pole mounting hole, the base is abutted on the second insulating part, and the protruding structure can be turned outwards towards the radial direction of the column part and is pressed on the second insulating part; The protruding structure is provided with two straight parts and two circular arc parts which are oppositely arranged, the straight parts and the circular arc parts are sequentially connected in an annular mode in an alternating mode, at least one circular arc part is provided with a notch, the notch extends downwards along the axial direction of the column body from the end face of the protruding structure, and the bottom wall of the notch is flush with the top end of the column body. Furthermore, the pole is provided with a first symmetrical plane which is parallel to the straight part and perpendicular to the base, and two side walls of the notch are symmetrically arranged about the first symmetrical plane. Further, on a projection plane perpendicular to the axial direction of the pole, the outer arc length of the arc part is M, the outer arc length corresponding to the projection of the notch is M, and the relation between the two is that K=m/M, and K is 33.3% -66.7%. Further, a groove is formed in the intersection position of the protruding structure and the end face of the column body, and the groove is annular along the inner side of the protruding structure. Further, the dimension h of the groove in the axial direction of the pole is between 0.2mm and 0.8mm, and/or the dimension w of the root of the groove in the direction perpendicular to the axial direction of the pole is between 0.2mm and 0.5mm. Further, in the axial direction of the pole, the outer side end face of the folded convex structure is coplanar with the top end of the column part. The first insulating piece comprises a main body part, a first edge and a second edge, wherein the first edge and the second edge are arranged on the main body part, the main body part is in butt joint with the upper surface of the cover plate body, the folded convex structure is pressed on the main body part, the first edge is connected to the inner peripheral side of the main body part and extends downwards along the axial direction of the pole, the first edge is positioned between the outer surface of the column part and the hole wall of the pole mounting hole, the second edge is connected to the outer peripheral side o