US 12,224,449 B2
Case, secondary battery, battery pack, vehicle, and method for manufacturing secondary battery
Jingjing Yu, Ningde (CN); Jie Du, Ningde (CN); Zhiming Chen, Ningde (CN); and Ruiqi Han, Ningde (CN)
Assigned to Contemporary Amperex Technology (Hong Kong) Limited, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Dec. 28, 2021, as Appl. No. 17/563,077.
Application 17/563,077 is a continuation of application No. PCT/CN2020/105558, filed on Jul. 29, 2020.
Claims priority of application No. 201910884725.4 (CN), filed on Sep. 19, 2019.
Prior Publication US 2022/0123406 A1, Apr. 21, 2022
Int. Cl. H01M 50/209 (2021.01); H01M 50/124 (2021.01); H01M 50/271 (2021.01)
CPC H01M 50/209 (2021.01) [H01M 50/1245 (2021.01); H01M 50/271 (2021.01); H01M 2220/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for manufacturing a secondary battery, comprising:
providing a case comprising:
a bottom wall and a side wall, the bottom wall and the side wall defining an accommodating cavity with an opening at one end for accommodating an electrode assembly of the secondary battery;
wherein, an outer surface of the side wall comprises a coated region coated with an insulating coating, and the coated region extends, in a height direction of the side wall, from a side of the side wall that is close to the bottom wall to a position near an edge of a side of the side wall that is close to the opening, so as to reserve a non-coated region with a preset height on the outer surface of the side wall that is near an edge of the opening, and the coated region has an area of from 70% to 85%, relative to a total area of the outer surface of the side wall and the coated region has an extension height of from 70% to 85% in the height direction, relative to a total height of the side wall, and
wherein the insulating coating comprises: relative to a total weight of the insulating coating, 80-97 wt % of insulating film-forming resin, 3-12 wt % of auxiliary agent, and 0-8 wt % of pigment,
the case is a positively charged metal case;
placing the electrode assembly into the accommodating cavity from the opening;
covering the opening by a cover plate, and welding the cover plate and the side wall to each other; and
bonding a second insulating film to the outside of the side wall, the second insulating film covering at least the non-coated region, the second insulating film comprises a bonding segment and a stacking segment successively arranged in the height direction, the bonding segment is bonded to the non-coated region, and the stacking segment extends from the bonding segment to an outer surface of the insulating coating, and wherein an outer surface of the cover plate away from the accommodating cavity is provided with a first insulating film, and the second insulating film and the first insulating film are disposed integrally, and the stacking segment has an extension height of from 1.5 mm to 6 mm in the height direction.