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CN-122000567-A - Top cover assembly, battery cell, battery and electricity utilization device

CN122000567ACN 122000567 ACN122000567 ACN 122000567ACN-122000567-A

Abstract

The application provides a top cover component, a battery monomer, a battery and an electric device, which relate to the technical field of batteries, wherein the top cover component comprises a top cover plate, the top cover plate comprises a metal layer and an insulating layer along the thickness direction of the top cover plate, the insulating layer comprises a first insulating piece and a second insulating piece, the mechanical strength of the second insulating piece is larger than that of the first insulating piece, the second insulating part comprises an insulating body and second bulges, the insulating body is provided with at least one first through hole penetrating through the thickness direction of the insulating body, at least part of the first insulating part is arranged in the first through hole, the second bulges are arranged at two ends of the insulating body along the length direction of the insulating body, and the second bulges protrude from the insulating body to the direction deviating from the metal layer. So not only reduced the total thickness of lamina tecti, also improved the space utilization of battery monomer inside height, usable second arch butt electrode assembly simultaneously avoids electrode assembly to take place to shift, has also avoided the emergence of thermal runaway, has improved the free security performance of battery.

Inventors

  • CHEN SHENGLI
  • ZHANG RUIPENG
  • WANG RUI
  • YU HONGJIANG
  • TIAN WEN

Assignees

  • 江苏正力新能电池技术股份有限公司

Dates

Publication Date
20260508
Application Date
20260108

Claims (14)

  1. 1. A header assembly, comprising: Top board (10), along its thickness direction, top board (10) include metal level (11) and insulating layer (12), insulating layer (12) are including first insulating part (121) and second insulating part (122), wherein, the mechanical strength of second insulating part (122) is greater than the mechanical strength of first insulating part (121), second insulating part (122) include insulator (129) and second arch (123), insulator (129) are equipped with at least one first through-hole (125) that runs through its thickness direction, at least part of first insulating part (121) is located first through-hole (125), second arch (123) are located insulator (129) are along its length direction's both ends, second arch (123) are followed insulator (129) are to deviating from the direction protrusion of metal level (11).
  2. 2. The header assembly according to claim 1, wherein the insulating body (129) and at least part of the first insulating member (121) are stacked in a thickness direction of the header plate (10).
  3. 3. The top cover assembly according to claim 2, wherein the surface of the first insulating member (121) facing the insulating body (129) is provided with at least one first protrusion (120), the first protrusion (120) is limited in the first through hole (125), along the thickness direction of the top cover plate (10), the surface of the first protrusion (120) and the surface of the insulating body (129) facing away from the first insulating member (121) are in the same plane, and the side of the first insulating member (121) facing the metal layer (11) is connected with the metal layer (11).
  4. 4. The roof assembly according to claim 1, wherein the first insulating member (121) is embedded in the second insulating member (122) in a thickness direction of the roof panel (10).
  5. 5. The header assembly of claim 4, wherein the first insulator (121) is embedded within the first through hole (125) of the second insulator (122), and a surface of the first insulator (121) facing the metal layer (11) is flush with a surface of the second insulator (122) facing the metal layer (11), and a surface of the first insulator (121) facing away from the metal layer (11) is flush with a surface of the insulator body (129) facing away from the metal layer (11).
  6. 6. The header assembly of any one of claims 1 to 5, wherein the metal layer (11), the first insulator (121), and the second insulator (122) are of unitary construction.
  7. 7. The header assembly of claim 6, wherein the metal layer (11) is provided with first nanopores on a surface in contact with the first insulating member (121), at least a portion of the first insulating member (121) being embedded in the first nanopores to be connected to the metal layer (11), and/or, The second insulating piece (122) is provided with a second nano hole on the surface contacted with the first insulating piece (121), and at least part of the first insulating piece (121) is embedded into the second nano hole to be connected with the second insulating piece (122).
  8. 8. The header assembly of claim 6, wherein the first insulating member (121) and the metal layer (11) have a junction area S4 satisfying 300mm 2 ≤S4≤15000mm 2 , and/or, On a virtual plane perpendicular to the thickness direction of the top cover plate (10), the area of the orthographic projection area of the outer contour of the metal layer (11) is S5, which satisfies 1300mm 2 ≤S5≤20000mm 2 , and/or, Satisfies that S4/S5 is more than or equal to 20 percent and less than or equal to 75 percent, and/or, The thickness of the metal layer (11) is a along the thickness direction of the top cover plate (10), and the thickness is 0.1 mm-1.5 mm and/or the thickness of the metal layer is a, The thickness of the metal layer (11) is a along the thickness direction of the top cover plate (10), and the total thickness of the top cover plate (10) is b, so that the ratio of a/b is more than or equal to 5% and less than or equal to 60%.
  9. 9. The header assembly according to any one of claims 1 to 5, wherein a minimum distance h between a surface of the second protrusion (123) away from the insulating body (129) and a surface of the insulating body (129) in a thickness direction of the header plate (10) is 2 mm≤h≤8mm, and/or, The maximum width of the second bulge (123) is L1 along the length direction of the top cover plate (10), and the L1 is more than or equal to 3mm and less than or equal to 20mm, and/or, The maximum width of the second bulge (123) is L1 along the length direction of the top cover plate (10), and the width of the metal layer (11) is L2 along the width direction of the top cover plate (10), so that the condition that L1/L2 is more than or equal to 5% and less than or equal to 50% is satisfied.
  10. 10. The header assembly of any one of claims 1 to 5, wherein the first through-hole (125) is elongated and/or arcuate in shape and/or, The first through holes (125) are arranged on the insulating body (129) along the length direction and/or along the width direction thereof, and/or, The total area of the openings of the first through holes (125) is S1, the area of the orthographic projection area of the outer contour of the second insulating piece (122) on a dummy plane vertical to the thickness direction of the top cover plate (10) is S2, and the conditions that S1/S2 is more than or equal to 10% and less than or equal to 70%, and/or, The metal layer (11) is provided with a first liquid injection hole (112), the insulating body (129) is provided with a second liquid injection hole (126) corresponding to the first liquid injection hole (112), and/or, The metal layer (11) is provided with a pressure relief mechanism (113), and the insulating body (129) is provided with an exhaust hole (127) corresponding to the pressure relief mechanism (113).
  11. 11. A battery cell comprising the cap assembly of any one of claims 1 to 10.
  12. 12. A battery cell, comprising: a housing (30) having an opening; At least one electrode assembly (20) housed within the case (30), the electrode assembly (20) having a corner portion (21); The cap assembly according to any one of claims 1 to 10, wherein the second protrusion (123) of the cap assembly abuts the corner portion (21) of the electrode assembly (20).
  13. 13. A battery comprising the battery cell of claim 11 or claim 12.
  14. 14. An electrical device comprising the battery cell of claim 11 or claim 12 or comprising the battery of claim 13.

Description

Top cover assembly, battery cell, battery and electricity utilization device Technical Field The invention relates to the technical field of batteries, in particular to a top cover assembly, a battery cell, a battery and an electric device. Background In the technical field of batteries, continuous improvement of energy density and space utilization rate of battery monomers is one of the core development targets. In the related art, the top cap assembly of the battery cell generally includes a top cap plate and a lower plastic, which is generally fixed under the top cap plate by means of heat fusion, for insulating the top cap plate and the electrode assembly. However, since the strength of the lower plastic is relatively low, in order to ensure that the entire top cap assembly has sufficient strength, it is generally necessary to increase the thickness of the top cap sheet, and in order to prevent the problem of insulation failure of the lower plastic, the thickness of the lower plastic is also often designed to be relatively thick. So set up, can lead to the whole thickness of top cap subassembly thicker, can occupy great battery monomer inside altitude space to the inside space utilization of battery monomer has been influenced. If the space utilization of the height direction of the inside of the battery cell is improved by thinning the thickness of the top cover assembly, the thickness of the top cover sheet can only be thinned due to the limited strength of the lower plastic, and thus, the overall strength of the top cover assembly is poor. In addition, because the strength of the lower plastic is relatively low, the heat resistance of the lower plastic is also low, and when the internal temperature of the battery monomer is rapidly increased, the lower plastic is easily heated to deform or melt, so that the internal short circuit of the battery monomer is caused, and the safety performance of the battery monomer is further influenced. Disclosure of Invention The application aims to provide a top cover assembly, a battery cell, a battery and an electric device, so as to solve the technical problem that the top cover assembly in the prior art cannot have better strength and space utilization simultaneously. In a first aspect, the application provides a top cover assembly, which comprises a top cover plate, wherein the top cover plate comprises a metal layer and an insulating layer along the thickness direction of the top cover plate, the insulating layer comprises a first insulating piece and a second insulating piece, the mechanical strength of the second insulating piece is larger than that of the first insulating piece, the second insulating piece comprises an insulating body and a second bulge, the insulating body is provided with at least one first through hole penetrating through the thickness direction of the insulating body, at least part of the first insulating piece is arranged in the first through hole, the second bulge is arranged at two ends of the insulating body along the length direction of the insulating body, and the second bulge protrudes from the insulating body to a direction deviating from the metal layer. In one or more embodiments of the present application, the insulating body and at least a portion of the first insulating member are stacked in a thickness direction of the top cover plate. In one or more embodiments of the present application, the surface of the first insulating member facing the insulating body is provided with at least one first protrusion, the first protrusion is limited in the first through hole, and along the thickness direction of the top cover plate, the surface of the first protrusion and the surface of the insulating body facing away from the first insulating member are in the same plane, and one side of the first insulating member facing the metal layer is connected with the metal layer. In one or more embodiments of the present application, the first insulating member is embedded in the second insulating member along the thickness direction of the top cover plate. In one or more embodiments of the present application, the first insulating member is embedded in the first through hole of the second insulating member, and a surface of the first insulating member facing the metal layer is flush with a surface of the second insulating member facing the metal layer, and a surface of the first insulating member facing away from the metal layer is flush with a surface of the insulating body facing away from the metal layer. In one or more embodiments of the present application, the metal layer, the first insulating member, and the second insulating member are integrally formed. In one or more embodiments of the application, the metal layer is provided with first nanopores on a surface in contact with the first insulating member, at least a portion of the first insulating member being embedded in the first nanopores and being connected to the metal layer, and