Patent ID: 8723457
Filing Date: 2014-05-13
Classification: B60K,B60L,B60W,Y02T

Abstract:
1. An electric vehicle driven with output power from a motor, comprising: a first battery unit that has at least one secondary battery; a second battery unit that has at least one secondary battery; a first step-up/down circuit that transmits electric power with voltage regulation between a first battery voltage system connected to the at least one secondary battery of the first battery unit and a motor side; a second step-up/down circuit that transmits electric power with voltage regulation between a second battery voltage system connected to the at least one secondary battery of the second battery unit and the motor side; and a control module that controls the first step-up/down circuit and the second step-up/down circuit so that drive of both of the first step-up/down circuit and the second step-up/down circuit is stopped in a parking case that a gearshift position is a parking position, wherein the control module controls the first step-up/down circuit and the second step-up/down circuit to supply electric power from the at least one secondary battery of the second battery unit to at least one device connected to the first battery voltage system until an accumulated charge ratio difference becomes less than or equal to a second predetermined value that is less than a predetermined value, in a case that the accumulated charge ratio difference is more than the predetermined value even in the parking case, the accumulated charge ratio difference being obtained by subtracting a first accumulated charge ratio that is a ratio of an accumulated charge amount of the at least one secondary battery of the first battery unit to whole capacity of the at least one secondary battery of the first battery unit from the second accumulated charge ratio that is a ratio of an accumulated charge amount of the at least one secondary battery of the second battery unit to whole capacity of the at least one secondary battery of the second battery unit.