BATTERY DEVICE TEMPERATURE MEASUREMENT METHOD

摘要

It is an object to provide an electrical storage device temperature measuring method for accurately measuring the internal temperature of an electrical storage device as compared to an existing electrical storage device temperature measuring method by which the internal temperature of the electrical storage device cannot be accurately obtained since a measured value of a measured internal impedance varies due to influence of a deterioration state of the electrical storage device. An internal impedance of an electrical storage device (1) is measured by using a signal of a frequency which ions in the electrical storage device (1) are difficult to follow (e.g., a frequency equal to or higher than 10 kHz), and an internal temperature of the electrical storage device (1) is calculated from a measured value of the internal impedance.