Patent ID: 8423233

Claim:
A degradation determining apparatus for a power storage device mounted on a vehicle for driving, said vehicle being configured such that electric power can be transferred between said power storage device and a power supply external to the vehicle or an electrical load external to the vehicle, said degradation determining apparatus comprising: a vehicle identifying unit for identifying said vehicle based on an identification number of said vehicle obtained from said vehicle; a first evaluation processor for evaluating a degradation state of said power storage device mounted on the vehicle corresponding to the identification number obtained by said vehicle identifying unit based on use history of said power storage device indicated based on a travel distance or running time by said power storage device, using data analyzed beforehand concerning a relation between the use history and the degradation state of said power storage device; a second evaluation processor for evaluating a degradation state of said power storage device, using data indicating a charge/discharge state of said power storage device measured when electric power is transferred between said power storage device mounted on said vehicle and said power supply or said electrical load; and a degradation determining unit for determining a degradation state of said power storage device based on the degradation state evaluated by said first evaluation unit and the degradation state evaluated by said second evaluation unit.