Assembled battery with stacked metal plate connection member

摘要

An assembled battery is provided which can improve output density. Four unit cells are connected in series by a connection member 40 composed of a stacked metal plate obtained by stacking two metal plates 40a and 40b. The metal plate 40a is one of copper and aluminum while the metal plate 40b is nickel. Since the volume electrical resistance of both copper and aluminum is less than half that of nickel, the overall electrical resistance of the connection member 40 is lowered. Both end portions of the connection member 40 are joined to external electrode terminals by resistance welding so that the weld joint is formed from either a Cu-Ni or Al-Ni low resistance binary alloy.