Electric power source control device, control method, and storage medium

A control method executed by an electric power source control device that controls an electric power converter that connects a high-voltage battery and a low-voltage battery, the control method comprising:

• detecting a predetermined operation executed with respect to the high-voltage battery;
• acquiring a charging and discharging current of the low-voltage battery when the predetermined operation is detected, and determining whether a state in which the charging and discharging current is no greater than a first threshold value continues for a first duration of time;
• controlling the electric power converter when the state in which the charging and discharging current is no greater than the first threshold value continues for the first duration of time, and further determining whether the state in which the charging and discharging current is no greater than the first threshold value continues for a second duration of time that is longer than the first duration of time;
• and
• determining that a connection state of the low-voltage battery is abnormal when the state in which the charging and discharging current is no greater than the first threshold value continues for the second duration of time.

A non-transitory storage medium storing a control program that is executed by a computer of an electric power source control device that controls an electric power converter that connects a high-voltage battery and a low-voltage battery, the control program comprising:

• detecting a predetermined operation executed with respect to the high-voltage battery;
• acquiring a charging and discharging current of the low-voltage battery when the predetermined operation is detected, and determining whether a state in which the charging and discharging current is no greater than a first threshold value continues for a first duration of time;
• controlling the electric power converter when the state in which the charging and discharging current is no greater than the first threshold value continues for the first duration of time, and further determining whether the state in which the charging and discharging current is no greater than the first threshold value continues for a second duration of time that is longer than the first duration of time;
• and
• determining that a connection state of the low-voltage battery is abnormal when the state in which the charging and discharging current is no greater than the first threshold value continues for the second duration of time.