Direct resistance welding - self brazing of aluminum to molybdenum pin

A direct welding process for joining a current collector (34) to a terminal pin (52) in the construction of electrochemical cells (50) is described. The resistance welding process utilizes increased current combined with an applied force to bond dissimilar metals with a melting temperature differential of preferably more than 500°C. Preferably, the method is used to bond the terminal pin (52) to the cathode current collector (34). This method of attachment is suitable for either primary or secondary cells, particularly those powering implantable biomedical devices.