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CN-122025947-A - Battery cell cover plate and battery

CN122025947ACN 122025947 ACN122025947 ACN 122025947ACN-122025947-A

Abstract

The invention relates to the technical field of batteries and provides a battery cell cover plate and a battery, wherein the battery cell cover plate comprises a cover plate body and a pole, the cover plate body comprises an opposite outer surface and an inner surface, the cover plate body is provided with a protruding part extending from the inner surface to the outer surface, and one side of the protruding part, which is close to the inner surface, forms a containing cavity with an opening facing the inside of the battery cell; the pole penetrates through the cover plate body, and the height of the pole extending out of the outer surface of the cover plate body is lower than that of the protruding portion. According to the battery cell cover plate provided by the invention, the protruding part is arranged on the outer surface of the cover plate body, and the top end of the pole is lower than the protruding part, so that an effective physical protection mechanism is formed. When the battery receives external impact or extrusion, the bellying can contact and disperse external force for the utmost point post provides buffering protection, avoids the impact force to pass through the utmost point post and transmits to the inside utmost point group of electric core, protects the structural stability of utmost point group, reduces the risk of dislocation of utmost point group and internal short circuit because of external force leads to, promotes the safety in utilization and the reliability of battery.

Inventors

  • YUAN YUE
  • DING RUOYU

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 battery cell comprises a cover plate body, a battery cell and a battery cell, wherein the cover plate body comprises an outer surface and an inner surface which are opposite, the cover plate body is provided with a protruding part extending from the inner surface to the outer surface, and one side of the protruding part, which is close to the inner surface, forms a containing cavity with an opening facing the inside of the battery cell; the pole penetrates through the cover plate body, and the height of the pole extending out of the outer surface of the cover plate body is lower than that of the protruding portion.
  2. 2. The cell cover plate according to claim 1, wherein the cover plate body is provided with an assembly hole, and the boss comprises: One end of the annular plate is connected to the periphery of the assembly hole and extends towards the outer side of the cover plate body; The sealing plate is connected to the other end of the annular plate, the sealing plate and the inner wall of the assembly hole enclose a containing cavity, and the connecting sheet and the lug are connected through the containing cavity.
  3. 3. The cell cover of claim 2, wherein the sealing plate is detachably connected to the other end of the ring plate.
  4. 4. The cell cover plate according to claim 1, wherein the height of the pole extending out of the outer surface of the cover plate body is H1, the height of the protruding portion is H2, and H1 and H2 satisfy that H2-H1 is 1.5-mm-3.0 mm.
  5. 5. The cell cover plate according to claim 1, wherein the height of the protruding portion is H2, the thickness of the cover plate body is T, and H2 and T satisfy H2/T is less than or equal to 3.0.
  6. 6. The battery cell cover plate according to claim 5, wherein the thickness T of the cover plate body is 1.5 mm-3 mm.
  7. 7. The cell cover plate according to claim 1, wherein the thickness t of the protruding portion has a value range of 1.5 mm-2 mm.
  8. 8. The battery cell cover plate according to any one of claims 1 to 7, wherein two ends of the cover plate body in the length direction are provided with two pole holes, and the two pole holes are respectively provided with two pole posts; the anti-explosion valve hole is formed in the middle of the cover plate body, two protruding portions are arranged on the cover plate body, and are located on two sides of the anti-explosion valve hole respectively and between the anti-explosion valve hole and the pole hole.
  9. 9. The cell cover plate according to claim 8, wherein the projected area of the cover plate body in the thickness direction of the cover plate body is S, the projected area of the boss in the thickness direction of the cover plate body is S1, the projected area of the explosion-proof valve hole in the thickness direction of the cover plate body is S2, the projected areas of the post holes in the thickness direction of the cover plate body are S3, S, S1, S2 and S3, and the ratio of 0.3≤2S1+S2+2S3)/S≤0.5 is satisfied, and/or, The projection area S1 of the protruding part along the thickness direction of the cover plate body is 1.3F/2S1< R, wherein F is an external impact load, and R is the yield strength of the cover plate body.
  10. 10. A battery, comprising: A cell housing; The battery cell cover plate according to any one of claims 1 to 9, wherein a closed space is formed by the battery cell cover plate and the battery cell shell; The electrode group is arranged in the closed space and is electrically connected with the battery cell cover plate.

Description

Battery cell cover plate and battery Technical Field The invention relates to the technical field of batteries, in particular to a battery cell cover plate and a battery. Background The lithium ion battery has the advantages of large capacity, high working voltage, strong charge holding capacity, long cycle life and the like, and is widely applied to various fields such as traffic power supply, electric energy storage power supply, new energy storage power supply, aerospace military industry and the like. In the prior art, a basic unit of the lithium ion battery is a battery core, and the battery core structure consists of electrolyte, a pole group, a bare battery core insulating sheet, a cover plate, a battery core shell, a top-sticking patch, an external insulating film and the like. The battery cell shell is fixedly connected with the cover plate through welding to form a closed space for accommodating the electrode group, the cover plate comprises an optical aluminum plate, and a pole column, a liquid injection hole and an explosion-proof structure which are integrated on the optical aluminum plate, and the periphery of the optical aluminum plate is welded, sealed and fixed with the battery cell shell. When the battery cells form a module or a battery PACK (PACK), a plurality of battery cells are usually arranged side by side or stacked, and are welded at the top ends of the poles protruding out of the plane of the optical aluminum plate through a Busbar (bus bar) so as to realize series-parallel connection among the battery cells. However, when the upper part of the battery pack is impacted or extruded by an external object, external force can be transmitted to the pole group inside the battery cell through the pole, so that dislocation of the internal structure is easily caused, and internal short circuit is caused, thereby bringing potential safety hazard. Disclosure of Invention The invention provides a battery core cover plate and a battery, which are used for solving the defect that the battery pack in the prior art has high risk of internal short circuit when being subjected to external impact, and effectively buffering and dispersing external stress applied to a battery core so as to enhance the impact resistance of the battery pack. The invention provides a battery cell cover plate, comprising: The battery cell comprises a cover plate body, a battery cell and a battery cell, wherein the cover plate body comprises an outer surface and an inner surface which are opposite, the cover plate body is provided with a protruding part extending from the inner surface to the outer surface, and one side of the protruding part, which is close to the inner surface, forms a containing cavity with an opening facing the inside of the battery cell; the pole penetrates through the cover plate body, and the height of the pole extending out of the outer surface of the cover plate body is lower than that of the protruding portion. According to the battery cell cover plate provided by the invention, the cover plate body is provided with the assembly hole, and the protruding part comprises: One end of the annular plate is connected to the periphery of the assembly hole and extends towards the outer side of the cover plate body; The sealing plate is connected to the other end of the annular plate, an accommodating cavity is formed between the annular plate, the sealing plate and the inner wall of the assembly hole, and the connecting sheet and the lug are connected through the accommodating cavity. According to the battery cell cover plate provided by the invention, the sealing plate is detachably connected to the other end of the ring plate. According to the battery cell cover plate provided by the invention, the height of the polar post extending out of the outer surface of the cover plate body is H1, the height of the protruding part is H2, and H1 and H2 meet the requirements that H2-H1 is less than or equal to 1.5 and less than or equal to 3.0mm. According to the battery cell cover plate provided by the invention, the height of the protruding part is H2, the thickness of the cover plate body is T, and H2/T is less than or equal to 3.0. According to the battery cell cover plate provided by the invention, the thickness T of the cover plate body is 1.5 mm-3 mm. According to the battery cell cover plate provided by the invention, the range of the wall thickness t of the protruding part is 1.5 mm-2 mm. According to the battery core cover plate provided by the invention, two ends of the cover plate body along the length direction are provided with the pole holes, and two poles are respectively arranged in the two pole holes; the anti-explosion valve hole is formed in the middle of the cover plate body, two protruding portions are arranged on the cover plate body, and are located on two sides of the anti-explosion valve hole respectively and between the anti-explosion valve hole and the pole hole. According to the battery