Abstract
International standards for safety evaluation tests of lithium-ion batteries, which are beginning to be installed in those vehicles, are IEC 62660-2 for cells and ISO 12405-1 and ISO 12405-2 for battery packs and systems. We conducted safety evaluation tests to verify the relevance of the test method. In this paper we report on the high-temperatre endurance tests results. The IEC high-temperatre endurance test specifies that cells should be heated to 130 ºC in a convective constant temperature bath, but we also heated them to 150 ºC. Some cells ignited while cooling from 150 ºC to ambient temperature. Some cells may also ignite even after being heated to the 130 ºC test temperature specified in IEC, so the cell temperature should fall to at least 50 ºC before the IEC test is terminated.
