Abstract: The main factors affecting the thermal runaway propagation of LiFePO4 batteries are studied experimentally, and the thermal runaway propagation experiments are carried out by designing battery modules with different states of charge, spacing and electrical connections. The influence of different factors on the thermal runaway propagation is analyzed according to the parameters of the battery surface temperature, the change of the battery voltage and the mass. The results show that the influence of different factors on thermal runaway propagation is in the following order: state of charge, cell spacing, and electrical connections. Meanwhile, it is also obtained that the main heat transfer mode leading to thermal runaway propagation is heat conduction, with heat transfer to the downstream battery as the main heat transfer path.

Key words: tactile sensing technology, energy storage safety, lithium-ion batteries, thermal runaway, swelling force