Search

CN-122026032-A - Battery cell

CN122026032ACN 122026032 ACN122026032 ACN 122026032ACN-122026032-A

Abstract

The application discloses a battery monomer, and relates to the technical field of batteries. The battery unit comprises a shell, a side end cover, an electrode assembly and an insulating piece, wherein the shell is provided with a cavity and an opening communicated with the cavity, the side end cover is arranged on the shell and used for closing the opening, the electrode assembly is arranged in the cavity and provided with a first surface and a second surface in the height direction of the battery unit, and the insulating piece is wrapped on the outer side of the electrode assembly and overlapped at the first surface of the electrode assembly to form a supporting part used for supporting the electrode assembly. The thickness of insulating part in battery monomer direction of height can be increased to this supporting part to can replace original side support bearing structure, avoid introducing new material, thereby improve packaging efficiency and reduce manufacturing cost. In addition, the electrode assembly with the supporting part can be tightly assembled with the shell when being arranged in the shell, so that the problem that the electrode assembly moves in the production process to cause tearing of the electrode lugs is avoided.

Inventors

  • TONG WU

Assignees

  • 阳光电源股份有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (13)

  1. 1. A battery cell, comprising: a housing having a cavity and an opening in communication with the cavity; the side end cover is arranged on the shell and is used for closing the opening; An electrode assembly disposed within the cavity, the electrode assembly having a first surface and a second surface in a height direction of the battery cell; And an insulating member wrapped outside the electrode assembly and overlapping at the first surface of the battery cell.
  2. 2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The electrode assembly also has a third surface and a fourth surface, the first surface being disposed opposite the second surface, the third surface being disposed opposite the fourth surface; The insulator comprises a first coverage area, a second coverage area, a third coverage area, a fourth coverage area and a fifth coverage area, wherein the first coverage area is wrapped on the first surface, the second coverage area is wrapped on the second surface, the third coverage area is wrapped on the third surface, the fourth coverage area is wrapped on the fourth surface, and the fifth coverage area is at least partially wrapped on the first coverage area to form a first supporting part.
  3. 3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells, The thickness of the second coverage area, the thickness of the third coverage area and the thickness of the fourth coverage area are all equal, and the thickness of the second coverage area is smaller than the thickness of the first coverage area and/or the thickness of the fifth coverage area.
  4. 4. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells, The thickness of the first supporting part is 0.2-1mm.
  5. 5. The battery cell of claim 2, further comprising: The side support piece is arranged between the second surface and the third coverage area.
  6. 6. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The insulator includes: A first insulating film wrapped outside the electrode assembly, and A second insulating film wrapped outside the electrode assembly; Wherein the first insulating film and the second insulating film at least partially overlap at the first surface and/or the second surface of the battery cell.
  7. 7. The battery cell of claim 6, wherein the battery cell comprises a plurality of cells, The first insulating film is wrapped around the outside of the second insulating film at the first surface to form a second support portion, the second insulating film is wrapped around the outside of the first insulating film at the second surface of the battery cell to form a third support portion, or The second insulating film is wrapped outside the first insulating film at the first surface to form a second supporting portion, the first insulating film is wrapped outside the second insulating film at the second surface to form a third supporting portion, or The first insulating film is wrapped around the outer side of the second insulating film at the first surface to form the second supporting portion, the first insulating film is wrapped around the outer side of the second insulating film at the second surface to form the third supporting portion, or The second insulating film is wrapped outside the first insulating film at the first surface to form a second supporting portion, and the second insulating film is wrapped outside the first insulating film at the second surface to form a third supporting portion.
  8. 8. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells, The electrode assembly also has a third surface and a fourth surface, the first surface being disposed opposite the second surface, the third surface being disposed opposite the fourth surface; The first insulating film comprises a first sub-coverage area, a second sub-coverage area and a third sub-coverage area, wherein the first sub-coverage area is wrapped on the first surface, the second sub-coverage area is wrapped on the second surface, and the third sub-coverage area is wrapped on the third surface; The second insulating film comprises a fourth sub-coverage area, a fifth sub-coverage area and a sixth sub-coverage area, wherein the fourth sub-coverage area is wrapped on the first surface, the fifth sub-coverage area is wrapped on the second surface, and the sixth sub-coverage area is wrapped on the fourth surface; wherein the first sub-coverage area is arranged between the first surface and the fourth sub-coverage area, and the fifth sub-coverage area is arranged between the second surface and the second sub-coverage area, or The fourth sub-coverage area is arranged between the first surface and the first sub-coverage area, and the second sub-coverage area is arranged between the second surface and the fifth sub-coverage area, or The first sub-coverage area is arranged between the first surface and the fourth sub-coverage area, and the second sub-coverage area is arranged between the second surface and the fifth sub-coverage area, or The fourth sub-coverage area is disposed between the first surface and the first sub-coverage area, and the second sub-coverage area is disposed between the second surface and the fifth sub-coverage area.
  9. 9. The battery cell of claim 8, wherein the battery cell comprises a plurality of cells, The thickness of the first sub-coverage area is equal to that of the second sub-coverage area, and the thickness of the third sub-coverage area is smaller than that of the first sub-coverage area; The thickness of the fourth sub-coverage area and the thickness of the fifth sub-coverage area, and the thickness of the sixth sub-coverage area is smaller than the thickness of the fourth sub-coverage area.
  10. 10. The battery cell of claim 9, wherein the battery cell comprises a plurality of cells, The thickness of the first sub-coverage area, the thickness of the second sub-coverage area, the thickness of the fourth sub-coverage area and the thickness of the fifth sub-coverage area are all equal; the thickness of the third sub-coverage area is equal to the thickness of the sixth sub-coverage area.
  11. 11. The battery cell of claim 6, wherein the battery cell comprises a plurality of cells, The thickness of the first insulating film is 0.1-0.5mm; the thickness of the second insulating film is 0.1-0.5mm.
  12. 12. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells, The thickness of the second supporting part and/or the third supporting part is 0.2-1mm.
  13. 13. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The first through hole is formed in the first surface of the insulating piece, the second through hole is formed in the second surface of the insulating piece, and the first through hole and the second through hole are arranged in a staggered mode in the height direction of the battery unit.

Description

Battery cell Technical Field The application relates to the technical field of batteries, in particular to a battery monomer. Background In the conventional battery cell assembly process, in order to prevent interference between the electrode assembly and the interior angle of the case, side support plates are placed on the top and bottom surfaces of the electrode assembly, and the side support is fixed with the electrode assembly by using a C-shaped rubberizing manner. Subsequently, an inner insulating film (Mylar film) is used to encapsulate the electrode assembly in a loop-type manner to provide internal insulation protection. But this assembly requires the use of side tabs to support the electrode assembly to prevent interference between the electrode assembly and the interior corners of the case. From the viewpoint of battery cell materials, materials of the side support sheet are introduced. In view of the assembly process, a side sheet positioning process, a loading process, and an insulating film mounting process are required, and these processes require introduction of corresponding equipment. Thus, the material costs and equipment, manufacturing costs of the battery are generally increased. Disclosure of Invention The invention aims to provide a battery cell group, which solves the problems that the cost of materials, equipment and manufacturing cost of the battery cells are increased when the existing side support plates are used for supporting an electrode assembly. The application provides a battery cell, which comprises a shell, a side end cover, an electrode assembly and an insulating piece, wherein the shell is provided with a cavity and an opening communicated with the cavity, the side end cover is arranged on the shell and used for closing the opening, the electrode assembly is arranged in the cavity and provided with a first surface and a second surface in the height direction of the battery cell, and the insulating piece is wrapped on the outer side of the electrode assembly and overlapped at the first surface of the battery cell. In some embodiments, the electrode assembly further has a third surface and a fourth surface, the first surface disposed opposite the second surface, the third surface disposed opposite the fourth surface, the insulator including a first footprint, a second footprint, a third footprint, a fourth footprint, and a fifth footprint, the first footprint being wrapped around the first surface, the second footprint being wrapped around the second surface, the third footprint being wrapped around the third surface, the fourth footprint being wrapped around the fourth surface, the fifth footprint being at least partially wrapped around the first footprint to form the first support. In some embodiments, the thickness of the second footprint, the thickness of the third footprint, and the thickness of the fourth footprint are all equal, and the thickness of the second footprint is less than the thickness of the first footprint and/or the fifth footprint. In some embodiments, the first support has a thickness of 0.2-1mm. In some embodiments, the battery cell further includes a side tab disposed between the second surface and the third footprint. In some embodiments, the insulating member includes a first insulating film wrapped around the outside of the electrode assembly, and a second insulating film wrapped around the outside of the electrode assembly, wherein the first insulating film and the second insulating film at least partially overlap at the first surface and/or the second surface of the battery cell. In some embodiments, the first insulating film wraps around the outside of the second insulating film at the first surface to form the second support, the second insulating film wraps around the outside of the first insulating film at the second surface of the battery cell to form the third support, or the second insulating film wraps around the outside of the first insulating film at the first surface to form the second support, the first insulating film wraps around the outside of the second insulating film at the second surface to form the third support, or the first insulating film wraps around the outside of the second insulating film at the first surface to form the second support, the first insulating film wraps around the outside of the second insulating film at the second surface to form the third support, or the second insulating film wraps around the outside of the first insulating film at the first surface to form the second support. In some embodiments, the electrode assembly further comprises a third surface and a fourth surface, the first surface is opposite to the second surface, the third surface is opposite to the fourth surface, the first insulating film comprises a first sub-coverage area, a second sub-coverage area and a third sub-coverage area, the first sub-coverage area is wrapped on the first surface, the second sub-coverage area is wrapped o