Search

CN-121983701-A - Cylindrical battery and battery pack

CN121983701ACN 121983701 ACN121983701 ACN 121983701ACN-121983701-A

Abstract

The application discloses a cylindrical battery and a battery pack, and belongs to the technical field of battery packs. The cylindrical battery comprises a battery core, a shell, a separation column and at least one through hole, wherein the shell surrounds the periphery of the battery core, a cooling cavity is arranged in the shell, the cooling cavity surrounds the periphery of the shell, the separation column is arranged in the cooling cavity to separate the cooling cavity into a plurality of sub cooling cavities, and the separation column is provided with at least one through hole which is communicated with two adjacent sub cooling cavities.

Inventors

  • Ye Chengtao
  • ZHANG MENG
  • YANG WEI

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260105

Claims (11)

  1. 1. A cylindrical battery, comprising: a battery cell (10); the battery pack comprises a shell (20), wherein the shell (20) surrounds the periphery of the battery cell (10), a cooling cavity (21) is arranged in the shell (20), and the cooling cavity (21) is arranged along the circumferential direction of the shell (20); The separation column (30), separation column (30) set up in cooling chamber (21) is interior, in order will cooling chamber (21) is divided into a plurality of sub-cooling chamber (211), be provided with at least one through-hole (31) on separation column (30), through-hole (31) intercommunication is adjacent two sub-cooling chamber (211).
  2. 2. The cylindrical battery according to claim 1, wherein the partition column (30) is provided along a circumferential direction of the case (20), the through-hole (31) includes a plurality of through-holes (31) arranged on the partition column (30) at intervals along the circumferential direction of the case (20).
  3. 3. The cylindrical battery according to claim 2, wherein the partition column (30) includes a plurality of the partition columns (30) arranged at intervals in the radial direction and/or the axial direction of the case (20).
  4. 4. The cylindrical battery according to claim 1, wherein the case (20) includes a first sub-case (22) and a second sub-case (23), the first sub-case (22) being located on a side away from the battery cell (10), the second sub-case (23) being located on a side close to the battery cell (10), the first sub-case (22) and the second sub-case (23) enclosing to form the cooling chamber (21); The first sub-shell (22) is provided with a liquid injection hole (221), the liquid injection hole (221) is communicated with the cooling cavity (21), and the liquid injection hole (221) is used for injecting cooling liquid into the cooling cavity (21).
  5. 5. Cylindrical battery according to claim 4, characterized in that the first sub-casing (22) and/or the second sub-casing (23) are provided with drain holes, which drain holes are in communication with the cooling chamber (21), for draining the cooling liquid in the cooling chamber (21).
  6. 6. The cylindrical battery according to claim 5, wherein the drain hole includes a first drain hole (222), the first drain hole (222) being provided on the first sub-case (22), the first drain hole (222) being communicated with the cooling chamber (21); The cylindrical battery further comprises a first hole sealing sheet, and the first hole sealing sheet is detachably connected to the first liquid draining hole (222).
  7. 7. The cylindrical battery according to claim 6, wherein the housing (20) has a first end and a second end disposed opposite to each other in an axial direction of the housing (20), The first liquid draining holes (222) comprise a plurality of first liquid draining holes (222), part of the first liquid draining holes (222) are arranged at the first end of the shell (20) at intervals, and the other part of the first liquid draining holes (222) are arranged at the position, close to the first end of the shell (20), of the side wall of the shell (20) at intervals.
  8. 8. The cylindrical battery according to claim 7, wherein the first drain hole (222) provided on the side wall of the case (20) has a first opening (2221) distant from the cooling chamber (21) and a second opening (2222) close to the cooling chamber (21); The first opening (2221) has a height lower than that of the second opening (2222) in the axial direction of the housing (20).
  9. 9. The cylindrical battery according to claim 5, wherein the drain hole further comprises a second drain hole (231), the second drain hole (231) being provided on the second sub-case (23), the second drain hole (231) being communicated with the cooling chamber (21); The cylindrical battery further comprises a second hole sealing sheet, the second hole sealing sheet is detachably connected to the second liquid draining hole (231), and the second hole sealing sheet is a heat-sensitive hole sealing sheet.
  10. 10. The cylindrical battery according to claim 9, wherein the heat-sensitive sealing sheet comprises at least one of a heat-sensitive ceramic sealing sheet and a heat-sensitive plastic sealing sheet.
  11. 11. A battery pack, comprising: A case; the cylindrical battery of any one of claims 1-10, disposed within the case.

Description

Cylindrical battery and battery pack Technical Field The application relates to the technical field of battery packs, in particular to a cylindrical battery and a battery pack. Background The cylindrical battery is used as an important packaging form of the battery, and has the advantages of high labeling degree, mature process and the like. The cylindrical battery comprises a cylindrical shell and a cylindrical cell arranged in the shell. In the related art, a casing of a cylindrical battery is usually a metal casing with a single-layer structure, and an electric core is supported and packaged through the casing. However, the metal shell with the single-layer structure cannot effectively conduct heat inside the battery cell, so that the temperature of the battery cell is unevenly distributed, and the service life and safety of the battery cell are affected. Disclosure of Invention The application discloses a cylindrical battery and a battery pack, which are used for solving or at least partially solving the problems that in the prior art, a metal shell with a single-layer structure cannot effectively conduct heat in a battery cell, so that the temperature of the battery cell is unevenly distributed, and the service life and the safety of the battery cell are influenced. In order to solve the technical problems, the application is realized as follows: The application discloses a cylindrical battery which comprises a battery core, a shell, a separation column and at least one through hole, wherein the shell surrounds the periphery of the battery core, a cooling cavity is arranged in the shell, the cooling cavity is arranged along the circumferential direction of the shell, the separation column is arranged in the cooling cavity to separate the cooling cavity into a plurality of sub cooling cavities, and the separation column is provided with at least one through hole which is communicated with two adjacent sub cooling cavities. In some embodiments, the partition columns are arranged along the circumferential direction of the shell, the through holes comprise a plurality of through holes, and the through holes are arranged on the partition columns at intervals along the circumferential direction of the shell. In some embodiments, the separation column comprises a plurality of separation columns, and the plurality of separation columns are arranged at intervals along the radial direction and/or the axial direction of the shell. In some embodiments, the shell comprises a first sub-shell and a second sub-shell, the first sub-shell is located at one side far away from the battery cell, the second sub-shell is located at one side close to the battery cell, the first sub-shell and the second sub-shell are enclosed to form the cooling cavity, the first sub-shell is provided with a liquid injection hole, the liquid injection hole is communicated with the cooling cavity, and the liquid injection hole is used for injecting cooling liquid into the cooling cavity. In some embodiments, a liquid drain hole is arranged on the first sub-shell and/or the second sub-shell, the liquid drain hole is communicated with the cooling cavity, and the liquid drain hole is used for draining cooling liquid in the cooling cavity. In some embodiments, the drain hole comprises a first drain hole arranged on the first sub-shell and communicated with the cooling cavity, and the cylindrical battery further comprises a first hole sealing sheet detachably connected to the first drain hole. In some embodiments, the housing has a first end and a second end disposed opposite each other along an axial direction of the housing, the first drain hole includes a plurality of first drain holes, a portion of the first drain holes are disposed at intervals at a location of the first end of the housing, and another portion of the first drain holes are disposed at intervals at a location of the housing sidewall proximate the first end of the housing. In some embodiments, the first drain hole provided on the side wall of the housing has a first opening far from the cooling cavity and a second opening near to the cooling cavity, and the height of the first opening is lower than the height of the second opening along the axial direction of the housing. In some embodiments, the liquid drain hole further comprises a second liquid drain hole, the second liquid drain hole is arranged on the second sub-shell and is communicated with the cooling cavity, the cylindrical battery further comprises a second hole sealing sheet, the second hole sealing sheet is detachably connected to the second liquid drain hole, and the second hole sealing sheet is a heat-sensitive hole sealing sheet. In some embodiments, the heat-sensitive sealing sheet comprises at least one of a heat-sensitive ceramic sealing sheet, a heat-sensitive plastic sealing sheet. The application also discloses a battery pack, which comprises a box body, and the cylindrical battery in the first aspect is arran