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CN-122025948-A - Battery cell cover plate and battery

CN122025948ACN 122025948 ACN122025948 ACN 122025948ACN-122025948-A

Abstract

The invention relates to the technical field of batteries and provides a battery core cover plate and a battery, wherein the battery core cover plate comprises a cover plate body, a pole post, a connecting sheet and a lower plastic part, the cover plate body is provided with a containing cavity, and the containing cavity is provided with an opening facing one side of the inner surface of the cover plate body; the pole is arranged on the cover plate body in a penetrating way; the connecting sheet is arranged on one side of the inner surface of the cover plate body, one end of the connecting sheet is connected with the pole, and the other end of the connecting sheet extends to the accommodating cavity; the lower plastic part comprises a lower plastic main body and a moving part, the lower plastic main body is arranged on the inner surface of the cover plate body, the moving part is provided with a pressing part, and the moving part is movably connected with the lower plastic main body and is suitable for moving between a first position and a second position; the movable piece is positioned at a second position, and the pressing part moves out of the accommodating cavity; the moving part moves to the first position, is pressed on one side, deviating from the cover plate body, of the lower plastic main body, the pressing part stretches into the accommodating cavity, the lug is limited, and the reliability and safety of electric connection inside the battery cell are improved.

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 cover plate body is provided with a containing cavity, and the containing cavity is provided with an opening facing one side of the inner surface of the cover plate body; the pole is penetrated through the cover plate body; the connecting piece is arranged on the inner side of the cover plate body, one end of the connecting piece is connected with the pole, and the other end of the connecting piece extends to the accommodating cavity and is used for being connected with the pole lug; The lower plastic part comprises a lower plastic main body and a moving part, wherein the lower plastic main body is arranged on the inner surface of the cover plate body, the moving part is provided with a pressing part, the moving part is movably connected with the lower plastic main body and is suitable for moving between a first position and a second position, the moving part is pressed on one side, away from the cover plate body, of the lower plastic main body, the pressing part stretches into the accommodating cavity and is used for pressing the tab into the accommodating cavity, and the pressing part is moved out of the accommodating cavity in the second position.
  2. 2. The cell cover plate according to claim 1, wherein the outer surface of the cover plate body is provided with a convex portion, and the receiving cavity is formed by recessing the inner surface of the cover plate body toward the outer surface and extends into the convex portion.
  3. 3. The cell cover of claim 2, wherein the posts extend beyond the outer surface of the cover body to a height less than the height of the bosses.
  4. 4. The battery cell cover plate according to claim 1, wherein the height of the pressing portion in the thickness direction of the lower plastic body is adapted to the depth of the accommodating cavity minus the difference between the thicknesses of the connecting piece and the tab.
  5. 5. The cell cover plate according to claim 4, wherein the height H3 of the pressing portion has a value ranging from 1.2 mm to 3.5mm.
  6. 6. The cell cover plate according to claim 1, wherein in the first position, a projection of a welding area between the tab and the connecting piece in a thickness direction of the cover plate body is located within a contour range of the pressing portion.
  7. 7. The cell cover plate according to any one of claims 1 to 6, wherein the accommodating cavity is disposed along a length direction of the cover plate body and is located in a middle portion of the cover plate body; the two polar posts are arranged at the two ends of the cover plate body along the length direction; The two connecting pieces are respectively connected with the two polar posts at the first ends, and the second ends of the connecting pieces extend towards the accommodating cavity and extend into the accommodating cavity to be respectively connected with the two polar lugs; The movable parts are respectively and movably connected to two ends of the lower plastic main body in the length direction, and the pressing parts on each movable part are respectively suitable for extending into the accommodating cavity so as to respectively press the two lugs in the accommodating cavity.
  8. 8. The battery cell cover plate according to claim 7, wherein the lower plastic body is provided with a first positioning part, and the moving piece is provided with a second positioning part; in the first position, the first positioning portion and the second positioning portion are in abutting fit.
  9. 9. The battery cell cover plate of claim 7, wherein the connecting piece comprises a first connecting portion, a bending portion and a second connecting portion which are sequentially connected, the first connecting portion is connected to the pole, the bending portion extends towards the direction close to the outer surface of the cover plate body, and the second connecting portion is located in the containing cavity.
  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, the basic unit of a lithium ion battery is a battery core, and the basic unit is usually composed of a pole group, electrolyte, a battery core shell, a cover plate and necessary insulation and safety components. The cover plate is used as a key component of the battery core, integrates structures such as a pole column and an explosion-proof valve, forms a closed space through welding with the shell, and leads out the pole lug of the internal pole group to be electrically connected with the pole column through the connecting sheet. However, during the transportation or use of the battery, the reliability of the internal electrical connection of the battery is poor, which easily causes the increase of internal resistance or the instantaneous disconnection, thereby affecting the safety performance of the battery. Disclosure of Invention The invention provides a battery core cover plate and a battery, which are used for solving the defect that the safety performance is affected due to poor electrical connection reliability in the prior art, limiting a tab and preventing the tab from shaking in a shell, so that the reliability and the safety of the electrical connection of the battery are improved. The invention provides a battery cell cover plate, comprising: The cover plate body is provided with a containing cavity, and the containing cavity is provided with an opening facing one side of the inner surface of the cover plate body; the pole is penetrated through the cover plate body; the connecting piece is arranged on the inner side of the cover plate body, one end of the connecting piece is connected with the pole, and the other end of the connecting piece extends to the accommodating cavity and is used for being connected with the pole lug; The lower plastic part comprises a lower plastic main body and a moving part, wherein the lower plastic main body is arranged on the inner surface of the cover plate body, the moving part is provided with a pressing part, the moving part is movably connected with the lower plastic main body and is suitable for moving between a first position and a second position, the moving part is pressed on one side, away from the cover plate body, of the lower plastic main body, the pressing part stretches into the accommodating cavity and is used for pressing the lug in the accommodating cavity, and the pressing part moves out of the accommodating cavity in the second position. According to the battery cell cover plate provided by the invention, the outer surface of the cover plate body is provided with the protruding part, and the accommodating cavity is formed by recessing the inner surface of the cover plate body towards the outer surface and extends into the protruding part. According to the battery cell cover plate provided by the invention, the height of the pole extending out of the outer surface of the cover plate body is lower than the height of the protruding part. According to the battery cell cover plate provided by the invention, the height of the pressing part in the thickness direction of the lower plastic main body is matched with the difference of the depth of the accommodating cavity minus the thickness of the connecting sheet and the lug. According to the battery cell cover plate provided by the invention, the value range of the height H3 of the pressing part is 1.2 mm-3.5 mm. According to the battery cell cover plate provided by the invention, in the first position, the projection of the welding area between the tab and the connecting sheet along the thickness direction of the cover plate body is positioned in the outline range of the pressing part. According to the battery cell cover plate provided by the invention, the accommodating cavity is arranged along the length direction of the cover plate body and is positioned in the middle of the cover plate body; the two polar posts are arranged at the two ends of the cover plate body along the length direction; The two connecting pieces are respectively connected with the two polar posts at the first ends, and the second ends of the connecting pieces extend towards the accommodating cavity and extend into the accommodating cavity to be respectively connected with the two polar lugs; The movable parts are respectively and movably connected to two ends of the lower plastic main body in the length direction, and the pressing parts on each movable part are respectively suitable for extending into the ac