ALEXANDRIA, Va., April 15 -- United States Patent no. 12,599,991, issued on April 14, was assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) Ltd. (Hong Kong).

"Welding method, welding apparatus, welding device, and battery cell" was invented by Jianyun Chen (Ningde, China), Shiyuan Lian (Ningde, China), Chunyang Peng (Ningde, China) and Zeyuan Yin (Ningde, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A welding method includes placing a housing covered with an end cap into a jig, where a clearance structure is created on the jig and available for exposing a target weld zone between the end cap and the housing, and the target weld zone includes a first target weld zone section and a second target ...