A lithium battery spot welding machine utilizes the resistance heat generated when current flows through the contact surface between electrodes and workpieces. This equipment locally heats lithium battery tabs and cell components (including tab-to-tab connections) to a molten or plasticized state, then applies pressure through electrodes to form a secure welded joint. The working principle is based on the “resistance heating effect”: When high current (typically thousands to tens of thousands of amperes) passes through the contact point between electrodes and workpieces in milliseconds, the contact resistance and internal resistance of the workpiece convert electrical energy into thermal energy, rapidly raising the temperature of the welding area above the metal’s melting point to form a local fusion core. Simultaneously, the pressure applied by the electrodes ensures that the molten metal bonds tightly with the surrounding plastic-deformed material, forming a metall
