Battery diagnosis apparatus

A battery diagnosis apparatus configured to perform a diagnosis process that determines whether a battery mounted on an electric vehicle is a normal product, the battery diagnosis apparatus comprising a battery control unit configured to:

• release a limit imposed on an output value from the battery and subject the battery to discharging at an output value that is higher than a predetermined value to perform the diagnosis process;
• cancel, during the diagnosis process, a current limit control in which an output current of the battery gradually decreases when a voltage of the battery approaches a lower limit voltage;
• perform the diagnosis process while confirming that a temperature of the battery is not abnormally increased;
• and
• diagnose that the battery is not the normal product when at least one of the following conditions is satisfied:
• a voltage of the battery decreases to the lower limit voltage before a predetermined time elapses from a start of discharging of a current having a predetermined current value from the battery;
• or
• an output value from the battery during a period from the start of the discharging until the elapse of the predetermined time is equal to or less than a predetermined ratio of an output value to be outputted from a genuine, new battery during the period from the start of the discharging until the elapse of the predetermined time.