Power supply device of electric vehicle

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device in an electric motor vehicle capable of miniaturizing a precharge contactor and a main contactor that connect a battery and a load, and reducing an influence on the precharge contactor and the main contactor resulting from reduction in a voltage of a sub-battery or the like.SOLUTION: A power supply device 100 in an electric two-wheeled vehicle 10 includes: a main battery 18; a main contactor 106 and a precharge contactor 108 that perform connection and disconnection between the main battery 18 and an inverter circuit 112 and the like by being turned on and off; a sub-battery 68 as a drive power source of the contactors 106 and 108; a BMU 104 that drives and controls the contactors 106 and 108; and a voltage sensor 117 that senses a voltage value of the sub-battery 68. When the voltage value sensed by the voltage sensor 117 is larger than a threshold, the BMU 104turns on the precharge contactor 108 prior to the main contactor 106.

Description

technical field [0001] The present invention relates to a power supply device in an electric vehicle that supplies electric power from a main battery to a load of the electric vehicle. Background technique [0002] The following Patent Document 1 describes a power supply device for an electric vehicle. The power supply device for an electric vehicle includes: a BMU for managing the battery; a main contactor for connecting and disconnecting the battery and the motor; The contactor is a pre-charging contactor that is connected before connecting the main contactor in order to prevent inrush current; the PDU that controls the drive of the entire vehicle. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2011-131701 [0006] However, although it is preferable that the pre-charging contactor and the main contactor be formed to have a high withstand voltage corresponding to the large current flowing at the time of c...

AI Technical Summary

Problems solved by technology

[0006] However, although it is preferable that the pre-charging contactor and the main contactor be formed to have a high withstand voltage corresponding to the large current flowing at the time of contact, the pre-charging contactor and the main contactor with high withstand voltage are formed in a large size, for example, in When used in a small electric vehicle such as an electric motorcycle, it is difficult to secure a space for arranging the pre-charging contactor and the main contactor

[0007] On the other hand, if the starter electromagnetic type pre-charging contactor and main contactor are used, the miniaturization can be achieved. Although it is suitable for deployment in electric vehicles, it is caused by insufficient power of the battery that operates the pre-charging contactor. When the connection between the pre-charging contactor and the main contactor is interrupted in the middle, arc discharge may occur at the contact of the pre-charging contactor and the main contactor, resulting in welding of the contacts of the pre-charging contactor and the main contactor.

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