Secondary battery and method of manufacturing same

Details Secondary battery and method of manufacturing same Secondary battery and method of manufacturing same

H - Electricity

01

M

H01M 2/34 (2006.01) H01M 2/00 (2006.01) H01M 10/02 (2006.01) H01M 10/04 (2006.01)

Patent

CA 2326856

A secondary battery has a disconnect assembly for cutting off a current path when a pressure in the battery is abnormal, disposed in an open end of an outer casing. The disconnect assembly includes a rupture disk sealing the open end of the outer casing, a cap electrically connected to a portion of a surface of the rupture disk and serving as an outer terminal of the battery, a weld plate joined to a portion of another surface of the rupture disk and serving as an inner terminal of the battery and having vent holes, and an insulating gasket sealing a gap between the rupture disk and the outer casing and holding the rupture disk and the weld plate in an electrically insulated fashion, except for a space around a junction between the rupture disk and the weld plate. A portion of the rupture disk and the weld plate are so joined that the diffusion of atoms at a junction interface is in an initial stage. An ultrasonic welding machine is used to carry out the above joining.

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