BATTERY STATE DETECTION DEVICE AND BATTERY PACK INCORPORATED THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide a battery state detection device and a battery pack incorporated therewith, accurately providing the information to a user as to the need to change a secondary battery regardless of the cause of the deterioration of the secondary battery. SOLUTION: The battery state detection device for detecting the state of the secondary battery 200 feeding an electronic instrument 300 includes: a calculation processing unit 50 for calculating the capacity degradation rate and the internal resistance value of the secondary battery 200 and for determining the need to change the secondary battery 200 when either of the calculated capacity degradation rate and the internal resistance value or both of them reaches the value at which the change of the secondary battery 200 is needed; and a communication processing unit 70 for outputting the signal in accordance with the determined result by the calculation processing unit 50. COPYRIGHT: (C)2010,JPO&INPIT