In battery pack assembly line for assembling 18650, 21700, 26650, 26700, 32650 and 32700 battery packs, battery spot welding machine is common and is used to spot weld cell-to-cell busbars, which are pure nickel strips or nickel-plated steel strips, to the poles of cylindrical cells. As one of the important components of battery spot welder, spot welding electrode directly affects the spot welding...