Patent ID: 6117589
Filing Date: 2000-09-12
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
A lithium battery comprising positive and negative electrodes, at least one of said electrodes comprising a current collector and a layer of an active material capable of occluding and discharging lithium electrochemically provided on a surface of the current collector; an electrode external terminal connected to the electrode for providing electricity to the outside of the battery; and an electrode tab provided between the electrode and the electrode external terminal and joined at an end thereof to a surface of the current collector of the electrode and being connected at another end thereof to said electrode external terminal, wherein said electrode tab has a roughened surface and an untreated surface at the end joined to the current collector, said roughened surface having peaks and valleys wherein the difference (H) between a length (Hmax) of the highest peak from the untreated surface and a length (Hmin) of the deepest valley from the untreated surface is from 5 to 10 .mu.m, and said roughened surface is welded to the surface of said current collector.