LITHIUM ION SECONDARY BATTERY USING IONIC LIQUID, LITHIUM ION SECONDARY BATTERY MODULE, AND HEAT RETENTION DEVICE FOR LITHIUM ION SECONDARY BATTERY USING IONIC LIQUID OR FOR LITHIUM ION SECONDARY BATTERY MODULE

摘要

Provided are: a lithium ion secondary battery which uses an ionic liquid that is capable of achieving high output power; and a lithium ion secondary battery module. A cylindrical lithium ion secondary battery which is increased in heat insulation properties by having the main part of a cylindrical lithium ion secondary battery main body (1) contained in a cylindrical vacuum heat insulation container (3) that is formed of a stainless steel heat insulation material.