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CN-122025949-A - Battery cell cover plate and battery cell

CN122025949ACN 122025949 ACN122025949 ACN 122025949ACN-122025949-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 and a first insulating layer, 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, the supporting boss and the installing boss are arranged on the reference surface in a protruding mode, 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 height direction of the cover plate body, and the insulating layer comprises the first insulating layer and the second insulating layer which are sequentially stacked on one side, away from the reference surface, of the cover plate body. After assembly, the pole lugs can be actively pressed and fixed on the connecting part of the pole post from one side. The direct clamping and fixing force is provided for the electrode lugs, the movement of the electrode lugs in the battery core can be effectively limited, and the risk of fatigue fracture or cracking of the electrode lugs at bending positions or welding and printing areas caused by vibration and impact is remarkably reduced.

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 height direction of the cover plate body, and the second end of the pole is provided with a connecting part used for being connected with the pole lug; The insulating layer, including laminating in proper order the setting is in apron body deviates from first insulating layer and second insulating layer of one side of reference surface, the second end of utmost point post passes apron body with first insulating layer, and make it connecting portion are located first insulating layer with between the second insulating layer, the second insulating layer orientation first insulating layer one side with utmost point ear butt, in order will the utmost point ear compress tightly in connecting portion of utmost point post.
  2. 2. The cell cover plate according to claim 1, wherein one of the first insulating layer and the second insulating layer is provided with a buckle, and the other is provided with a clamping groove; the first insulating layer is connected to the second insulating layer through the buckle and the clamping groove.
  3. 3. The cell cover plate according to claim 2, wherein the first insulating layer is provided with a first boss adapted to the shape of the support boss at a position corresponding to the support boss, and the first insulating layer is assembled to the support boss through the first boss so as to be assembled to a side of the cover plate body facing away from the reference surface.
  4. 4. The battery cell cover plate according to claim 3, wherein two support bosses and two first insulating layers are arranged, the two support bosses are positioned at two ends of the mounting boss along the length direction of the cover plate body, and the two first insulating layers are assembled to one side of the cover plate body, which is away from the reference surface, through the corresponding first bosses; The two ends of the second insulating layer are respectively connected with the two first insulating layers, a second boss corresponding to the installation boss is arranged on the second insulating layer at a position corresponding to the installation boss, and the second boss is along the height of the cover plate body in the height direction and is flush with the first boss.
  5. 5. The battery cell cover plate according to claim 2, wherein the first insulating layer is provided with the clamping groove, the second insulating layer is provided with the buckle, the groove width of the clamping groove is phi 1, the width of the buckle is phi 2, and the requirement of phi 2/phi 1 is less than or equal to 1.2 and less than or equal to 1.5.
  6. 6. The cell cover plate according to claim 1, wherein the thickness of the second insulating layer in the height direction of the cover plate body is t1, satisfying 0.7 mm≤t1≤1.2 mm; The distance between the connecting part and the first insulating layer in the height direction of the cover plate body is a, and a is more than or equal to 0.2mm and less than or equal to 0.5mm; The distance between the connecting part and the second insulating layer along the height direction of the cover plate body is b, and b is more than or equal to 0.7mm and less than or equal to 1mm.
  7. 7. The cell cover plate according to claim 4, wherein the width of the cover plate body is W, and W is 25mm or less and 75mm or less; The length of the first insulating layer along the width direction of the cover plate body is W1, and the length of the first insulating layer along the width direction of the cover plate body is more than or equal to 22mm and less than or equal to 70mm; The length of the two ends of the second insulating layer along the width direction of the cover plate body is W2, and the length of the second boss along the width direction of the cover plate body is W3, so that W2 is less than or equal to W1, and W1-W3)/2 is less than or equal to 10mm.
  8. 8. The battery cell cover plate according to claim 1, 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 second insulating layer is provided with an air vent communicated with the mounting groove.
  9. 9. The cell cover of claim 8, 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.
  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 height direction of the cover plate body, and the second end of the pole is provided with a connecting part used for being connected with the pole lug; The insulating layer, including laminating in proper order the setting is in apron body deviates from first insulating layer and second insulating layer of one side of reference surface, the second end of utmost point post passes apron body with first insulating layer, and make it connecting portion are located first insulating layer with between the second insulating layer, the second insulating layer orientation first insulating layer one side with utmost point ear butt, in order will the utmost point ear compress tightly in connecting portion of utmost point post. According to the battery cell cover plate provided by the invention, one of the first insulating layer and the second insulating layer is provided with a buckle, and the other is provided with a clamping groove; the first insulating layer is connected to the second insulating layer through the buckle and the clamping groove. According to the battery cell cover plate provided by the invention, the first insulation layer is provided with the first boss which is matched with the support boss in shape at the position corresponding to the support boss, and the first insulation layer is assembled to the support boss through the first boss so as to be assembled to one side of the cover plate body, which is away from the reference surface. According to the battery core cover plate provided by the invention, two support bosses and two first insulating layers are arranged, the two support bosses are positioned at two ends of the mounting boss along the length direction of the cover plate body, and the two first insulating layers are assembled to one side, away from the reference surface, of the cover plate body through the corresponding first bosses; The two ends of the second insulating layer are respectively connected with the two first insulating layers, a second boss corresponding to the installation boss is arranged on the second insulating layer at a position corresponding to the installation boss, and the second boss is along the height of the cover plate body in the height direction and is flush with the first boss. According to the battery cell cover plate provided by the invention, the clamping groove is formed in the first insulating layer, the buckle is arranged in the second insulating layer, the groove width of the clamping groove is phi 1, the width of the buckle is phi 2, and the condi