US 12,136,748 B2
Energy storage device and electrical equipment
Jinqiang Chen, Fujian (CN)
Assigned to SHENZHEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., Shenzhen (CN); and XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., Fujian (CN)
Filed by Shenzhen Hithium Energy Storage Technology Co., Ltd., Shenzhen (CN); and XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., Fujian (CN)
Filed on Oct. 17, 2023, as Appl. No. 18/380,947.
Claims priority of application No. 202310090143.5 (CN), filed on Feb. 9, 2023.
Prior Publication US 2024/0274994 A1, Aug. 15, 2024
Int. Cl. H01M 50/536 (2021.01); H01M 50/533 (2021.01)
CPC H01M 50/536 (2021.01) [H01M 50/533 (2021.01)] 14 Claims
OG exemplary drawing
 
1. An energy storage device, comprising a housing, a jellyroll, a connecting sheet, and a top cover, wherein the jellyroll and the connecting sheet are received within the housing, and the top cover seals the housing,
the jellyroll is provided with a tab, and the connecting sheet includes a body part and a side wing part;
the energy storage device further comprises a welding structure, which is composed of the tab and the side wing part, and is formed by welding;
the tab comprises a plurality of tab sheets, in which a tab sheet farthest from the side wing part is a first tab sheet, the welding structure forms a welding area on the first tab sheet;
an area of the welding area is S1, an area of the side wing part is S2, and a projection area of the first tab sheet on a plane where the side wing part is located is S3, wherein 0.4≤S1/S2≤0.8, 0.14≤S1/S3≤0.28;
in a thickness direction of the side wing part, there is an overlapping area between the side wing part and the first tab sheet, the welding area comprises two fixing welding areas and a guiding welding area located in the overlapping area, and the fixing welding area and the guiding welding area are distributed along a length direction of the side wing part;
an area of each of the two fixing welding areas is S11, an area of the guiding welding area is S12, and an area of the overlapping area is S4, wherein 5%≤S11/S4≤25%, 10%≤S12/S4≤90%, and S11<S12,
wherein the two fixing welding areas are located on both sides of the guiding welding area along the length direction of the side wing part.