Quantitative Comparison of Thermal Influence among Laser Irradiation and Other Methods for Thermal Runaway of Traction Lithium Ion Battery

Initiation methods for thermal propagation tests are being discussed in the EVS-GTR. In this paper, laser irradiation was compared with nail penetration and heater heating using a prismatic Li-ion battery module from the viewpoint of heat energy transfer to adjacent cells. Such transfer with laser irradiation was 0.025% of that of heater heating and the adjacent cell’s temperature rise was less than 1°C by thermal runaway of the target cell. This result demonstrates that laser irradiation is a rational method in terms of replicating single cell thermal runaway only due to the cell’s own energy.