What exactly is a thermal battery? Thermal batteries are also called thermally activated reserve batteries. The single cell of the thermal battery is composed of a positive electrode (FeS iron-sulfur alloy), an electrolyte, and a heating sheet (iron powder). The main body of the heating sheet is iron powder, and its conductivity is relatively high. FeS iron sulfur is a semiconductor material, which has the lowest conductivity in the system. Therefore, it is the main point of ohm polarization control of the thermal battery of the system. Increasing its conductivity can reasonably and effectively reduce the internal resistance of the battery.

What is the working principle of thermal battery

To explain the thermal battery in one sentence, this is a molten salt electrolyte battery used once. The electrolyte of the thermal battery is a non-conductive solid at normal temperature. In actual use, first activate the pyrotechnic heat source in the battery, so that the electrolyte can melt and conduct electricity, and it can give electrical energy to the external circuit. The storage time of thermal batteries is conceptually infinitely long, and actually reaches about ten years. Thermal batteries have the advantages of high safety and reliability, long storage time, fast activation speed, large output current density, high specific energy, strong resistance to harsh environments, and no maintenance during storage. They are often used in weapons and military devices as fuses Power supply is currently widely used in military and commercial fields.

Hot battery working time

The working life of a thermal battery consists of electrical life and thermal life. The temperature inside the thermal battery must be maintained within a certain range of specifications before the battery can work normally, and this time of maintaining a certain temperature range is called thermal life, which depends on the heat-generating material in the battery, that is, The combustion characteristics of iron powder and the thermal insulation characteristics of its thermal insulation materials. Therefore, in order to extend the service life of the thermal battery, the first problem that must be considered is to find high-performance iron powder. The requirements for this iron powder are that the iron powder burns fast, the heat released during combustion is large, and the heat release Long time, small deformation after burning, etc.

Superfine iron powder for thermal battery

Because of its large specific surface area and high reactivity, ultra-fine iron powder has many characteristics such as electricity, magnetism, light, catalysis, and adsorption. It can be widely used in chemical industry, stone cutting, heating materials, etc. in electromagnetic, biological, optical , Metallurgy and other fields also have market potential. As a heating material for thermal batteries, it is also one of the main application fields of ultrafine iron powder.

SAT NANO provide specially made ultrafine iron powder 1-100um for thermal battery, if you have any interesting, please feel free to contact us at admin@satnano.com