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CN-122025952-A - Battery cell cover plate and battery cell

CN122025952ACN 122025952 ACN122025952 ACN 122025952ACN-122025952-A

Abstract

The invention relates to the technical field of batteries, and provides a battery cell cover plate and a battery cell. The battery core cover plate comprises a cover plate body, a pole column, a projection area S1 of the cover plate body on the plane of the reference surface, a sum of projection areas S2 of all the support bosses, and a projection area S3 of a pole column hole for the pole column to pass through, wherein the reference surface is formed on one side of the cover plate body, a plurality of support bosses which are distributed along the length direction of the cover plate body are formed on the reference surface, each support boss is convexly arranged on the reference surface, the pole column penetrates through a pole column hole, the height of the support boss relative to the reference surface is larger than the height of the pole column, which is convexly arranged on the reference surface, the projection area S1 of the cover plate body on the plane of the reference surface is equal to or more than S2/S1 and equal to or less than 0.35,0.015 and equal to or equal to S3/S1 and less than or equal to 0.03. The battery cell cover plate effectively avoids deformation, damage or failure with internal connection of the pole column due to direct stress while increasing the effective heat dissipation area by arranging the multiple support platforms, and fundamentally reduces the short circuit risk caused by the damage of the pole column.

Inventors

  • XIN XUEQIAN

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. A cell cover plate, comprising: one side of the cover plate body is provided with a reference surface, a plurality of support bosses which are arranged along the length direction of the cover plate body are formed on the reference surface, each support boss is convexly arranged on the reference surface, and a pole hole is formed between at least two adjacent support bosses; The pole penetrates through the pole hole and is positioned between two adjacent supporting bosses, and one end of the pole protrudes out of the datum plane; in the height direction of the cover plate body, the height of the supporting boss relative to the reference surface is larger than the height of the polar post protruding out of the reference surface; On a projection plane perpendicular to the reference plane, the projection area of the cover plate body on the plane where the reference plane is located is S1, the sum of the projection areas of all the support bosses is S2, the projection area of the pole hole through which the pole passes is S3, and the requirements of S2/S1 which is more than or equal to 0.25 and less than or equal to 0.35,0.015 and S3/S1 which is more than or equal to 0.03 are met.
  2. 2. The battery cell cover plate according to claim 1, wherein three support bosses are arranged at two ends and the middle of the reference surface along the length direction of the cover plate body, two pole posts are arranged, and the two pole posts respectively penetrate through corresponding pole post holes.
  3. 3. The cell cover plate according to claim 2, wherein in the length direction of the cover plate body, the distance between the terminal post and the adjacent support boss is a, satisfying a being equal to or greater than 4mm.
  4. 4. The cell cover plate according to claim 1, wherein in a height direction of the cover plate body, a distance by which the support boss protrudes from the reference surface is H1, a distance by which the first end of the terminal post protrudes from the reference surface is H0, and a distance by which the support boss protrudes from the first end of the terminal post is H2, satisfying 1.5mm +.h2= (H1-H0) +.3mm.
  5. 5. The cell cover plate according to claim 4, wherein the length of the cover plate body in the width direction of the cover plate body is W1, and the length of the single support boss in the width direction of the cover plate body is W2, satisfying 6mm < W1-W2 < 16mm.
  6. 6. The cell cover plate according to claim 5, wherein the cover plate body has a thickness T1, satisfying 2.0 mm-T1-2.5 mm.
  7. 7. The cell cover of claim 6, wherein the support boss is a tapered boss comprising a top wall and an inclined side wall surrounding the top wall and connected to the datum surface; the thickness of the cover plate body at the edge of the pole hole is T2, the thickness of the inclined side wall is T3, and the thickness of the top wall is T4, so that the following relation of T2/T1 which is more than or equal to 0.7 and less than or equal to 0.8,0.7 and T3/T1 which is more than or equal to 3834 and less than or equal to 0.85,0.7 and T4/T1 which is more than or equal to 0.9 is satisfied.
  8. 8. The cell cover plate according to claim 1, wherein the support boss is formed with a concave cavity on a side facing away from the reference surface; The cell cover plate further comprises: The insulating part is arranged on one side, deviating from the reference surface, of the cover plate body, a groove is formed in the position, corresponding to the concave cavity, of the insulating part, the groove is arranged in the concave cavity, and a gap between the side wall of the groove and the side wall of the concave cavity is B, so that the requirement that B is more than or equal to 1mm is met.
  9. 9. A kind of electric core, characterized by comprising the following steps: the first end of the battery cell shell is provided with an opening, the second end is provided with an explosion-proof valve; The battery cell cover plate according to any one of claims 1-8, wherein the cover plate body is arranged on the opening and surrounds the battery cell shell to form a containing cavity; the first end of the pole is protruded out of one side, far away from the battery cell shell, of the cover plate body, and the second end of the pole extends into the accommodating cavity; the pole group is arranged in the accommodating cavity, and the pole lug of the pole group is connected with the second end of the pole column.
  10. 10. The cell of claim 9, wherein the second end surface of the cell housing is provided with a stiffener disposed about the perimeter of the explosion-proof valve.

Description

Battery cell cover plate and battery cell Technical Field The invention relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. Background The lithium ion battery has become a core power source in the fields of electric automobiles, energy storage systems and the like by virtue of the advantages of high energy density, long cycle life and the like. The battery core is used as a basic unit of the lithium ion battery, and the structural design of the battery core is directly related to the overall performance, the safety and the energy density of the battery pack. Conventional cell covers are typically flat metal plates with protruding posts formed thereon. In the battery pack, the pole is electrically connected and fixed with the upper box body through the busbar, but gaps exist between most areas of the cover plate body and the upper box body, and direct contact cannot be realized. This structure has obvious disadvantages, firstly, poor mechanical strength. When the battery pack is impacted, external force acts on the protruding pole in a concentrated mode, the cover plate main body does not bear force, and damage or short circuit of the pole is easily caused. Second, the heat dissipation path is single. The heat is conducted mainly through the polar posts, and the battery cell cover plate can only radiate heat through inefficient heat radiation, so that abnormal temperature of the battery cell is easily caused. Disclosure of Invention The invention provides a battery cell cover plate and a battery cell, which are used for solving the problems that the current battery cell pole is easy to bear external force and the heat dissipation effect of the battery cell cover plate is poor. The invention provides a battery cell cover plate, comprising: one side of the cover plate body is provided with a reference surface, a plurality of support bosses which are arranged along the length direction of the cover plate body are formed on the reference surface, each support boss is convexly arranged on the reference surface, and a pole hole is formed between at least two adjacent support bosses; The pole penetrates through the pole hole and is positioned between two adjacent supporting bosses, and one end of the pole protrudes out of the datum plane; in the height direction of the cover plate body, the height of the supporting boss relative to the reference surface is larger than the height of the polar post protruding out of the reference surface; On a projection plane perpendicular to the reference plane, the projection area of the cover plate body on the plane where the reference plane is located is S1, the sum of the projection areas of all the support bosses is S2, the projection area of the pole hole through which the pole passes is S3, and the requirements of S2/S1 which is more than or equal to 0.25 and less than or equal to 0.35,0.015 and S3/S1 which is more than or equal to 0.03 are met. According to the battery core cover plate provided by the invention, three support bosses are arranged and are distributed at the two ends and the middle part of the reference surface along the length direction of the cover plate body, two pole posts are arranged, and the two pole posts respectively penetrate through corresponding pole post holes. According to the battery core cover plate provided by the invention, in the length direction of the cover plate body, the distance between the pole and the adjacent supporting boss is A, and the requirement that A is more than or equal to 4mm is met. According to the battery cell cover plate provided by the invention, in the height direction of the cover plate body, the distance of the supporting boss protruding from the reference surface is H1, the distance of the first end of the pole protruding from the reference surface is H0, and the distance H2 of the supporting boss protruding from the first end of the pole is 1.5 mm-H2= (H1-H0) -3 mm. According to the battery cell cover plate provided by the invention, the length of the cover plate body in the width direction of the cover plate body is W1, and the length of a single supporting boss in the width direction of the cover plate body is W2, so that the length of the supporting boss in the width direction of the cover plate body is less than or equal to 6mm and less than or equal to (W1-W2) and less than or equal to 16mm. According to the battery cell cover plate provided by the invention, the thickness of the cover plate body is T1, and T1 which is more than or equal to 2.0mm and less than or equal to 2.5mm is satisfied. According to the battery cell cover plate provided by the invention, the supporting boss is a conical boss, and the conical boss comprises a top wall and an inclined side wall which surrounds the top wall and is connected with the reference surface; the thickness of the cover plate body at the edge of the pole hole is T2, the thickness of the inclined side wall is T