CIRCUIT FOR ESTIMATING RESIDUAL LIFETIME AND ESTIMATION METHOD FOR RESIDUAL LIFETIME

摘要

PPROBLEM TO BE SOLVED: To provide a circuit which can improve calculation accuracy of residual lifetime of a nonaqueous secondary battery, and to provide an estimation method for residual lifetime. PSOLUTION: When the nonaqueous secondary battery is in a non-use condition, non-use degradation conversion time is defined as the time that degradation of nonaqueous secondary battery in non-use period becomes equal to the degradation arisen in predetermined standard conditions of the battery, and is computed in step S203 based on temperature and terminal voltage of the nonaqueous secondary battery. When a nonaqueous secondary battery is in use condition, degradation conversion time of a use period is defined as the time that the degradation of the nonaqueous secondary battery in use condition corresponds to degradation arisen in the standard conditions of the battery, and is computed in step S206, based on the temperature and charge and discharge current of the nonaqueous secondary battery. By subtracting the degradation conversion time in non-use condition and the degradation conversion time in usage condition from the standard lifetime of the nonaqueous secondary battery in the standard condition, the residual lifetime is estimated through computing, in step S205. PCOPYRIGHT: (C)2009,JPO&INPIT