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CN-122025950-A - Battery cell cover plate and battery cell

CN122025950ACN 122025950 ACN122025950 ACN 122025950ACN-122025950-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 protection piece and a pole post, wherein one side of the cover plate body is provided with a reference surface, a supporting boss is formed on the reference surface, the supporting boss is convexly arranged on the reference surface, the protection piece is arranged on the outer side of the cover plate body, the outer side of the cover plate body is provided with one side provided with the supporting boss, the protection piece is matched with the supporting boss in shape and covers the supporting boss, one end of the pole post penetrates through the reference surface, and the height of the supporting boss relative to the reference surface is larger than the height of the pole post, which is convexly arranged on the reference surface. According to the battery cell cover plate provided by the embodiment, the protective piece which is matched with the shape of the supporting boss and covers the supporting boss is arranged, and a reliable physical insulation barrier is constructed between the high-voltage pole and the cover plate body made of metal. The high risk of high voltage creepage or arc drawing in the air gap between the pole and the boss, which is possibly caused by adding the conductive boss, is fundamentally solved, and the electrical safety under the complex working condition is ensured.

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: The cover plate comprises a cover plate body, a cover plate and a cover plate, wherein one side of the cover plate body is provided with a reference surface, a support boss is formed on the reference surface, and the support boss is convexly arranged on the reference surface; the protection piece is arranged on the outer side of the cover plate body, the outer side of the cover plate body is provided with one side with the supporting boss, the shape of the protection piece is matched with the supporting boss, and the protection piece covers the supporting boss; And one end of the pole penetrates through the datum plane, and the height of the supporting boss relative to the datum plane is larger than the height of the pole protruding out of the datum plane.
  2. 2. The battery cell cover plate according to claim 1, wherein the supporting boss comprises a first boss and a second boss, wherein the first boss and the second boss are both arranged on the reference surface in a protruding mode, and the height of the first boss relative to the reference surface is larger than the height of the second boss relative to the reference surface; The explosion-proof valve is arranged on the first boss, the protection piece covers the first boss and the second boss, the protection piece is shielded on the outer side of the explosion-proof valve, which is away from the battery cell shell, and a notch is arranged at the position of the protection piece, which corresponds to the explosion-proof valve.
  3. 3. The cell cover plate according to claim 2, wherein a reinforcing rib is formed on the edge of the first boss and/or the second boss, and a clamping groove is formed at a position of the protection piece corresponding to the reinforcing rib, and the clamping groove is matched with the reinforcing rib so as to limit the protection piece.
  4. 4. A cell cover plate according to claim 3, wherein the first boss and/or the second boss are/is provided with a glue-coated area provided with a glue layer, and the protective member is fixed on the first boss and/or the second boss through the glue layer.
  5. 5. The cell cover plate according to claim 2, wherein the first boss and the second boss are both tapered bosses, an included angle between a side wall of the first boss and a direction perpendicular to the reference surface is γ, and an included angle between a side wall of the second boss and a direction perpendicular to the reference surface is β, so that 20 degrees β=γ is less than or equal to 25 degrees.
  6. 6. The cell cover plate according to claim 2, wherein the wall thickness of the guard member is c, the gap between the guard member and the second boss is d, and the gap between the guard member and the first boss surface is e in the height direction of the cover plate body, such that 0.9mm < c < 1.3mm,0.2mm < d < 0.5mm, and 0.5mm < e < 1mm are satisfied.
  7. 7. The cell cover plate according to claim 1, wherein an upper plastic is arranged on the reference surface, and one end of the pole is arranged in the upper plastic through the reference surface; And the distance between the upper plastic and the supporting boss is b, the distance a is more than or equal to 2mm and less than or equal to 5mm, and the distance b is more than or equal to 3mm and less than or equal to 5mm along the length of the cover plate body.
  8. 8. The cell cover of claim 7, wherein a distance f between the upper plastic and the guard in a length or width direction along the cover body satisfies 1mm ∈f ∈2mm.
  9. 9. The cell cover plate according to any one of claims 1 to 8, wherein the guard is made of a polypropylene material having a tensile strength of 125MPa or more, a flexural strength of 175MPa or more, a flexural modulus of 10000MPa or more, and a heat distortion temperature of 230 ℃ or more.
  10. 10. A kind of electric core, characterized by comprising the following steps: The battery cell shell is provided with an opening; the cell cover plate according to any one of claims 1 to 9, wherein the cell cover plate is arranged on the opening and surrounds the cell shell to form a containing cavity; the pole group is arranged in the accommodating cavity, and the pole lugs of the pole group are connected with the pole posts.

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 Lithium ion batteries have become an important component in the fields of power batteries, energy storage devices and the like because of the advantages of high energy density, long cycle life and the like. The battery cell is used as the minimum unit of the battery pack, the cover plate of the battery pack is not only a key component for sealing the shell and fixing the pole, but also functional elements such as an explosion-proof valve, a liquid injection hole and the like are generally integrated, and the structural design of the battery cell directly influences the overall performance of the battery cell and the battery pack. In order to optimize space and heat dissipation, the existing battery cell cover plate has a structure that a protrusion is arranged on the surface of the cover plate so as to fill a gap between the cover plate and the upper box body and increase contact and heat dissipation areas. However, the introduction of the boss structure brings new safety risks that the high-voltage pole on the battery cell cover plate is very close to the boss, and under the complex working conditions of high voltage, dust, moisture and the like, electric creepage and even arc discharge are very easy to generate between the boss and the pole, so that the battery cell is short-circuited, and the safety of the battery is seriously threatened. Disclosure of Invention The invention provides a battery cell cover plate and a battery cell, which are used for solving the problem that the battery cell is short-circuited because the pole of the battery cell cover plate is easy to climb or even arc with a boss. The invention provides a battery cell cover plate, comprising: The cover plate comprises a cover plate body, a cover plate and a cover plate, wherein one side of the cover plate body is provided with a reference surface, a support boss is formed on the reference surface, and the support boss is convexly arranged on the reference surface; the protection piece is arranged on the outer side of the cover plate body, the outer side of the cover plate body is provided with one side with the supporting boss, the shape of the protection piece is matched with the supporting boss, and the protection piece covers the supporting boss; And one end of the pole penetrates through the datum plane, and the height of the supporting boss relative to the datum plane is larger than the height of the pole protruding out of the datum plane. The invention provides a battery cell cover plate, which comprises a first boss and a second boss, wherein the first boss and the second boss are both arranged on a reference surface in a protruding mode, and the height of the first boss relative to the reference surface is larger than that of the second boss relative to the reference surface; The explosion-proof valve is arranged on the first boss, the protection piece covers the first boss and the second boss, the protection piece is shielded on the outer side of the explosion-proof valve, which is away from the battery cell shell, and a notch is arranged at the position of the protection piece, which corresponds to the explosion-proof valve. According to the battery cell cover plate provided by the invention, the edges of the first boss and/or the second boss are/is provided with the reinforcing ribs, the positions of the protection pieces corresponding to the reinforcing ribs are provided with the clamping grooves, and the clamping grooves are matched with the reinforcing ribs so as to limit the protection pieces. According to the battery cell cover plate provided by the invention, the gluing areas provided with the adhesive layers are arranged on the first bosses and/or the second bosses, and the protective piece is fixed on the first bosses and/or the second bosses through the adhesive layers. According to the battery cell cover plate provided by the invention, the first boss and the second boss are conical bosses, the included angle between the side wall of the first boss and the direction vertical to the reference surface is gamma, and the included angle between the side wall of the second boss and the direction vertical to the reference surface is beta, so that 20 degrees are less than or equal to beta=gamma is less than or equal to 25 degrees. According to the battery cell cover plate provided by the invention, the wall thickness of the protective piece is c, the gap between the protective piece and the second boss is d, and the gap between the protective piece and the surface of the first boss is e in the height direction of the cover plate body, so that the thickness of c is more than or equal to 0.9mm and less than or equal to 1.3mm, the thickness of d is more than or equal to 0.2mm and less than or equal to 0.5mm, and the thickness of e is more