The full name of the thermal battery is the thermally activated disposable chemical backup battery. When stored, the electrolyte is a non-conductive solid. When used, the pyrotechnic device is blasted by electrical or mechanical energy, and the internal heating material is ignited, so that the electrolyte is melted into an ion conductor and activated to provide electrical energy. out. The stainless steel shell is a completely sealed structure, consisting of ignition element, heating element, power supply element and heat preservation element.