[in Japanese]

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The methodology for thermal propagation test in electric vehicles has been discussed in an ISO meeting. Japan insists that the purpose of a thermal propagation test is to ''evaluate the behavior of a lithium ion battery pack when an internal short circuit occurs in one cell of the pack''. Although the Forced Internal Short Circuit (FISC) test is a representative test method, it's difficult to apply it to battery packs in automobile applications. As a triggering methodology for the test, we investigated that whether the number of internal short-circuitlayers equivalent to the FISC test is feasible or not by using a silicon nitride heater. The results indicate that the methodology has good repeatability of the supposed number ofinternal short circuit layers, if the heater is stopped at an appropriate time.

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