METHOD FOR MEASURING DERIVATIVE OF OPEN CIRCUIT VOLTAGE WITH RESPECT TO BATTERY TEMPERATURE, DEVICE FOR MEASURING DERIVATIVE OF OPEN CIRCUIT VOLTAGE WITH RESPECT TO BATTERY TEMPERATURE, BATTERY TEMPERATURE ESTIMATION METHOD, BATTERY TEMPERATURE ESTIMATION DEVICE, BATTERY DEGRADATION STATE PREDICTION METHOD, AND BATTERY DEGRADATION STATE PREDICTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method and device for measuring fundamental data for obtaining entropy change with high accuracy in a secondary battery etc.SOLUTION: In a method of measuring a derivative of open circuit voltage with respect to the temperature of a battery comprising secondary batteries, the open circuit voltage Vof a battery 11 is measured by a voltage measuring device 41 and the temperature T of the battery 11 is measured by a temperature measuring device 31, on the condition that temperature variations of the battery 11 are not greater than the temperature measurement limit of the temperature measuring device 31 and the condition that open circuit voltage variations of the battery 11 are not greater than the voltage measurement limit of the voltage measuring device 41. Based on those measurement results, the derivative of the battery open circuit voltage Vwith respect to the battery temperature T, namely, V/T, is obtained.