Abstract: A device is capable of evaluating the degree of deterioration of a secondary battery by executing regression analysis processing using, as a target variable, the degree of deterioration of the secondary battery. Multiple regression analysis is executed by using, as explanatory variables, respective values of plural model parameters that define a secondary battery model based on a measurement result of complex impedance of each reference secondary battery, and a degree of deterioration evaluated according to the secondary battery model as a target variable. Then, a degree of deterioration of a target secondary battery is evaluated according to a multiple regression equation obtained as a result of the multiple regression analysis.

Abstract: Provided is a device or the like that can improve the accuracy of battery performance evaluation of a rechargeable battery. Parameter values of a rechargeable battery model are identified on the basis of a measurement result of a complex impedance Z of a first rechargeable battery 221. The rechargeable battery model expresses an impedance of an internal resistance of the first rechargeable battery 221 with transfer functions representing IIR and FIR systems, respectively. Performance of a second rechargeable battery 222 is evaluated on the basis of a result of contrast between a voltage response characteristic V(t) that is output from a rechargeable battery 220 as the second rechargeable battery 222 when an impulse current I(t) is input to the second rechargeable battery 222, and a model voltage response characteristic Vmodel(t) when the impulse current is input to the rechargeable battery model having the parameter values identified.

Abstract: Provided is a device and the like capable of increasing the convenience in performance evaluation of a secondary battery. A battery performance evaluation device 100 evaluates the performance of a secondary battery 240 installed in an electronic apparatus 200 based on mutual communication between the electronic apparatus 200 and/or a charger 400, to which the electronic apparatus 200 is connected, and the battery performance evaluation device 100. Then, battery performance information Info(D) corresponding to the evaluation result is output to an output interface 204 of the electronic apparatus 200. Thus, a user can ascertain the performance evaluation result of the secondary battery 240 without the need to take the electronic apparatus 200 or the secondary battery 240 in a specialized institution or the like, thereby increasing the convenience for the user of the electronic apparatus 200.

Abstract: Provided is a device or the like that can improve the accuracy of battery performance evaluation of a rechargeable battery. Parameter values of a rechargeable battery model are identified on the basis of a measurement result of a complex impedance Z of a first rechargeable battery 221. The rechargeable battery model expresses an impedance of an internal resistance of the first rechargeable battery 221 with transfer functions representing IIR and FIR systems, respectively. Performance of a second rechargeable battery 222 is evaluated on the basis of a result of contrast between a voltage response characteristic V(t) that is output from a rechargeable battery 220 as the second rechargeable battery 222 when an impulse current I(t) is input to the second rechargeable battery 222, and a model voltage response characteristic Vmodel(t) when the impulse current is input to the rechargeable battery model having the parameter values identified.