US 12,469,937 B2
Cylindrical lithium-ion battery
Liming Huang, Hubei (CN); Liangliang Yue, Hubei (CN); Jing Liu, Hubei (CN); Yuebin Xu, Hubei (CN); and Wei He, Hubei (CN)
Assigned to EVE POWER CO., LTD., Hubei (CN)
Appl. No. 18/013,953
Filed by EVE POWER CO., LTD., Hubei (CN)
PCT Filed May 20, 2022, PCT No. PCT/CN2022/094126
§ 371(c)(1), (2) Date Dec. 30, 2022,
PCT Pub. No. WO2022/242751, PCT Pub. Date Nov. 24, 2022.
Claims priority of application No. 202121100873.1 (CN), filed on May 21, 2021.
Prior Publication US 2024/0106089 A1, Mar. 28, 2024
Int. Cl. H01M 50/538 (2021.01); H01M 10/04 (2006.01); H01M 10/0525 (2010.01); H01M 50/107 (2021.01); H01M 50/152 (2021.01); H01M 50/169 (2021.01); H01M 50/186 (2021.01); H01M 50/474 (2021.01)
CPC H01M 50/538 (2021.01) [H01M 10/0431 (2013.01); H01M 10/0525 (2013.01); H01M 50/107 (2021.01); H01M 50/152 (2021.01); H01M 50/169 (2021.01); H01M 50/186 (2021.01); H01M 50/474 (2021.01)] 10 Claims
OG exemplary drawing
 
1. A cylindrical lithium-ion battery, comprising a negative cap, a case, a jellyroll, and a negative current collector, wherein the case is cylindrical;
the jellyroll and the negative current collector are arranged inside the case, a sidewall of a bottom of the case is provided with an annular inwardly-concaved groove, the annular inwardly-concaved groove is arranged circumferentially around a central axis of the case, and the annular inwardly-concaved groove forms an annular protrusion inside the case, the negative current collector is connected to a negative electrode of the jellyroll, a portion of the case located below the annular inwardly-concaved groove is bent to form an annular engaging groove, an opening of the annular engaging groove faces towards the interior of the case, a periphery of the negative cap is arranged in the annular engaging groove, and a bottom surface of the negative cap and the annular engaging groove are connected in a sealed manner by laser welding.