Deterioration information output apparatus and deterioration information output method

A deterioration information output apparatus comprising:

• a memory configured to accumulate use history data of a secondary battery mounted as a motive power source for an electrically powered vehicle;
• an output unit configured to output deterioration information on a degree of deterioration of the secondary battery;
• and
• a control unit configured to set the deterioration information and have the output unit output the deterioration information,
• the control unit being configured to
• estimate based on the use history data, a first degree of deterioration of the secondary battery at a first time point after lapse of a predetermined period since start of use of the electrically powered vehicle,
• set a deterioration curve representing change over time in degree of deterioration of the secondary battery since the start of use based on the estimated first degree of deterioration,
• estimate based on the deterioration curve, a second degree of deterioration of the secondary battery at a second time point later than the first time point,
• set a deterioration straight line representing linear change over time in a degree of deterioration of the secondary battery from the first time point having an initial value until the second time point having the second degree of deterioration, the initial value being a degree of deterioration at the start of the use, and
• obtain the degree of deterioration of the secondary battery corresponding to time elapsed since the first time point based on the deterioration straight line and set the deterioration information.