HIGH TEMPERATURE SODIUM SECONDARY BATTERY SYSTEM AND ITS OPERATING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a high temperature secondary battery system suitable for a power storage system used for load leveling and peak shifting purposes and also for unsteady operations such as for an emergency power supply, an uninterruptible power supply, a standby power supply and the like, and its operating method. SOLUTION: A storage container 3 constituting a part of plural temperature sodium secondary battery modules 1 and a storage container 3' constituting remaining modules have different heat insulation, and a part of the modules 1 and the remaining modules 1' are mutually connected through an AC/DC converter 6, 6'. Thereby, this system can be operated in complicated operating patterns as a dual purpose system for load leveling and peak shifting purposes, and also for unsteady operations such as operations for an emergency power supply, an uninterruptible power supply, a standby power supply and the like, while keeping the temperature range of the high temperature sodium secondary battery module, and load leveling for a power becomes possible by using it as a system for a load following operation, a dual purpose system for an emergency power supply or the like.