Drain device for electric vehicle and electric vehicle having same

Abstract

The invention provides a discharging device for an electric car and the electric car. The discharging device comprises a power battery, a first contactor, a second contactor, a third contactor, capacitive loads, a fourth contactor, a resistive load, a relay and a controller, wherein one of the ends of the first contactor, the second contactor and the third contactors is connected with one end of the power battery; the other end of the first contactor is connected with the other end of the second contactor; both the second contactor and the third contactor are equipped with auxiliary contacts; the capacitive loads are connected in parallel with the power battery; the fourth contactor and the resistive load are connected in series and are both connected in parallel with a second capacitive load; a normally-closed contact, a control coil and a common end of the relay are respectively connected with the auxiliary point of the second contactor, the auxiliary contact of the third contactor, and the control end of the fourth contactor; the controller is used for opening the fourth contactor after the electric car is flamed out in order to discharge the load from the first capacitive load and the second capacitive load through the resistive load. With the adoption of the discharging device, the resistive load can be accurately controlled to be on and off, and thus the dangerous load can be effectively discharged; in addition, the discharging device has the advantages of being simple in structure and high in reliability.

Description

technical field [0001] The invention relates to the technical field of automobiles, and particularly designs a discharge device for electric automobiles and an electric automobile with the same. Background technique [0002] The on-off of the high-voltage system of electric vehicles and the power battery is realized through high-voltage DC contact switches. Electric vehicles are usually driven by motors, and accessories driven by engines on traditional vehicles such as steering brakes are also equipped with electrified accessories on electric vehicles. The drive motor and many electrified accessories use filter capacitors to filter the power supply when using the DC power of the power battery, and these filter capacitors can still be used for a long time after the high-voltage load of the electric vehicle is cut off from the power supply (power battery). A certain amount of charge is stored within a few minutes to a few hours. These charges are easily damaged by the energy s...

AI Technical Summary

Problems solved by technology

[0003] Most manufacturers now deal with these residual charges by connecting a bleeder resistor in parallel at both ends of the high-voltage load (that is, both ends of the filter capacitor), so that after the high-voltage load is disconnected, the filter capacitor and the bleeder resistor form an RC Back, the charge on the capacitor is discharged through the bleeder resistor, and the energy stored in the capacitor is also consumed in the form of heat. However, in addition to the need to increase the cost of the bleeder resistor and the thermal load of the cooling system, it also requires Increase the high-voltage switching device to carefully control the on and off of the resistor to prevent the discharge resistor from discharging when the high-voltage load is connected, and the control is complicated

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