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CN-122025946-A - Battery cell cover plate and battery cell

CN122025946ACN 122025946 ACN122025946 ACN 122025946ACN-122025946-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, an insulating layer, a fixing part and a turnover part, wherein one side of the cover plate body is provided with a reference surface, a supporting boss and an installation boss which are arranged along the length direction of the cover plate body are formed on the reference surface, the supporting boss and the installation boss are convexly arranged on the reference surface, the pole column penetrates through the cover plate body, the first end of the pole column protrudes out of the reference surface, the height of the supporting boss relative to the reference surface is larger than the height of the pole column protruding out of the reference surface in the thickness direction of the cover plate body, the second end of the pole column is used for being connected with a pole lug, the insulating layer comprises the fixing part and the turnover part, the fixing part is arranged on one side of the cover plate body, which is far away from the cover plate body, and the turnover part is rotatably connected with the fixing part. The battery cell cover plate firmly fixes the lug at the second end of the pole by introducing the turnover part and the fixing part, thereby greatly reducing the risk of fatigue fracture or welding and printing cracking of the lug and fundamentally improving the mechanical reliability and safety of the battery cell.

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, wherein one side of the cover plate body is provided with a reference surface, a supporting boss and an installing boss which are arranged along the length direction of the cover plate body are formed on the reference surface, and the supporting boss and the installing boss are convexly arranged on the reference surface; The pole penetrates through the cover plate body, the first end of the pole protrudes out of the reference surface, the height of the supporting boss relative to the reference surface is larger than the height of the pole protruding out of the reference surface in the thickness direction of the cover plate body, and the second end of the pole is used for being connected with the pole lug; The insulation layer comprises a fixing part and a turnover part, wherein the fixing part is arranged on one side, away from the cover plate body, of the cover plate body, the turnover part is rotatably connected to the fixing part, the insulation layer is in a turned-over state and a pressing state, the turnover part is separated from the pole lugs in the turned-over state, and the turnover part is covered and pressed on the pole lugs in the pressing state so as to fix the pole lugs and is connected with the second end of the pole post.
  2. 2. The battery cell cover plate according to claim 1, wherein the fixing portion comprises a first insulating layer, one of the first insulating layer and the cover plate body is provided with a clamping groove, the other one of the first insulating layer and the cover plate body is provided with a buckle, the first insulating layer is arranged on one side, away from the reference surface, of the cover plate body through the clamping groove and the buckle, the first insulating layer is located at a position corresponding to the mounting boss, and the first insulating layer is provided with a groove suitable for avoiding an internal structure.
  3. 3. The battery cell cover plate according to claim 2, wherein the mounting boss is provided with a mounting groove, and the battery cell cover plate further comprises an explosion-proof valve arranged in the mounting groove; The mounting boss is provided with an exhaust notch communicated with the mounting groove, and the first insulating layer is provided with an air vent communicated with the mounting groove.
  4. 4. The battery cell cover plate of claim 3, wherein the insulating layer further comprises a second insulating layer, wherein the second insulating layer is arranged on one side of the cover plate body, which is away from the reference surface, and is positioned at a position corresponding to the reference surface and the supporting boss.
  5. 5. The cell cover plate according to claim 4, wherein the wall thickness of the groove bottom of the first insulating layer is t, the wall thickness of the side wall of the groove is t1, the wall thickness of the turnover part is t2, t is more than or equal to 0.9mm and less than or equal to 1.1mm, t1/t is more than or equal to 0.9 and less than or equal to 1.3,0.6 and less than or equal to t2/t1 and less than or equal to 1.0.
  6. 6. The battery cell cover plate according to claim 3, wherein a plurality of air holes are formed, the projection area of the first insulating layer along the projection plane perpendicular to the thickness direction of the cover plate body is S, and the total area of all the air holes is S1, and S1/S is more than or equal to 0.2 and less than or equal to 0.4.
  7. 7. The battery core cover plate according to claim 1, wherein two pole posts are arranged on the cover plate body in A penetrating manner, two pole lugs are arranged on one side, away from the reference surface, of the cover plate body, second ends of the two pole posts are used for being connected with corresponding pole lugs, the distance between the two pole lugs in the length direction of the cover plate body is C, two pole lug welding stations are arranged on the pole posts in the width direction of the cover plate body, the distance between the outermost sides of the two pole lug welding stations in the width direction of the cover plate body is A, the width of the turnover part in the width direction of the cover plate body is B,2mm (B-A)/2 is less than or equal to 3.5mm,2mm (C-B)/2 is less than or equal to 4mm.
  8. 8. The cell cover of claim 4, the battery cell cover plate is characterized by further comprising: The first reinforcing ribs are arranged on at least one side edge of the support boss and the mounting boss along the width direction of the cover plate body; And the second reinforcing ribs are arranged on the periphery of the mounting boss corresponding to the explosion-proof valve.
  9. 9. The cell cover plate according to any one of claims 1 to 8, wherein two of the support bosses are provided, and the two support bosses are located at both ends of the mounting boss in the length direction of the cover plate body; A gluing area is arranged on the supporting boss; the battery core cover plate further comprises structural adhesive arranged in the adhesive coating area, and the height of the structural adhesive relative to the reference surface is larger than the height of the mounting boss relative to the reference surface in the height direction of the cover plate body so as to be abutted with an external structure through the structural adhesive.
  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 lithium ion battery, and the reliability and the safety of the internal structure of the battery cell are important. Conventional cover plate assemblies typically provide only simple insulation inside for insulation between the pole and the cover plate body. The lug at the top of the pole group is directly bent and welded at the lower end of the pole. Under the structure, the welded tab and the welded area are completely in an exposed state, and effective fixation and protection are lacked. When the battery core is subjected to external forces such as severe vibration and impact, the internal pole group can move, and the movement can directly generate pulling stress on the bending part of the pole lug and the welding and printing area, so that the fatigue fracture or the welding and printing fracture of the pole lug can be easily caused, and the internal short circuit is caused, so that the safety threat is formed. Disclosure of Invention The invention provides a battery cell cover plate and a battery cell, which are used for solving the problems that when the battery cell is subjected to external forces such as severe vibration, impact and the like, an internal pole group can shift, and fatigue fracture or welding and printing fracture of a pole lug are extremely easy to cause. The invention provides a battery cell cover plate, comprising: The cover plate comprises a cover plate body, wherein one side of the cover plate body is provided with a reference surface, a supporting boss and an installing boss which are arranged along the length direction of the cover plate body are formed on the reference surface, and the supporting boss and the installing boss are convexly arranged on the reference surface; The pole penetrates through the cover plate body, the first end of the pole protrudes out of the reference surface, the height of the supporting boss relative to the reference surface is larger than the height of the pole protruding out of the reference surface in the thickness direction of the cover plate body, and the second end of the pole is used for being connected with the pole lug; The insulation layer comprises a fixing part and a turnover part, wherein the fixing part is arranged on one side, away from the cover plate body, of the cover plate body, the turnover part is rotatably connected to the fixing part, the insulation layer is in a turned-over state and a pressing state, the turnover part is separated from the pole lugs in the turned-over state, and the turnover part is covered and pressed on the pole lugs in the pressing state so as to fix the pole lugs and is connected with the second end of the pole post. According to the battery cell cover plate provided by the invention, the fixing part comprises the first insulating layer, one of the first insulating layer and the cover plate body is provided with the clamping groove, the other one of the first insulating layer and the cover plate body is provided with the buckle, the first insulating layer is arranged on one side of the cover plate body, which is away from the reference surface, through the clamping groove and the buckle, the first insulating layer is positioned at a position corresponding to the installation boss, and the first insulating layer is provided with the groove suitable for avoiding the internal structure. According to the battery cell cover plate provided by the invention, the mounting boss is provided with the mounting groove, and the battery cell cover plate further comprises an explosion-proof valve arranged in the mounting groove; The mounting boss is provided with an exhaust notch communicated with the mounting groove, and the first insulating layer is provided with an air vent communicated with the mounting groove. According to the battery core cover plate provided by the invention, the insulating layer further comprises a second insulating layer, and the second insulating layer is arranged on one side of the cover plate body, which is away from the reference surface, and is positioned at a position corresponding to the reference surface and the supporting boss. According to the battery cell cover plate provided by the invention, the wall thickness of the groove bottom of the first insulating layer is t, the wall thickness of the side wall of the groove is t1, the wall thickness of the turnover part is t2, t is more than or equal to 0.9mm and less than or equal to 1.1mm, t1/t is more than or equal to 0.9 and less than or equal to 1.3,0.6 and less than or equal to 1.0, and t2/t1