Electric automobile and power system capable of being switched between charge-discharge function and drive function

Abstract

The invention provides a power system capable of being switched between a charge-discharge function and a drive function. The power system comprises a power battery, a charge-discharge socket, a two-way DC/DC (direct current/direct current) module, a drive control switch, a two-way DC/AC (direct current/alternating current) module, a motor control switch, a charge-discharge control module and a controller module, wherein the controller module is connected with the drive control switch, the motor control switch and the charge-discharge control module, and is used for establishing an access between the power battery and the motor when the current working mode of the power system is a drive mode, and for establishing an access between the charge-discharge socket and the power battery when the current working mode of the power system is a charge-discharge mode. The power system can achieve high-power alternating current charging for an electric automobile by a civil or industrial AC network, so that a user can charge efficiently and rapidly anytime anywhere; and the range of operating voltage of a suitable battery is wide, and the space and the cost are saved. The invention further provides an electric automobile.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a power system switching between charging and discharging and driving functions and an electric vehicle with the power system. Background technique [0002] With the development of science and technology, environmentally friendly and energy-saving electric vehicles are playing the role of replacing fuel vehicles. However, the popularization of electric vehicles still faces some problems. Among them, high mileage and fast charging technology have become a major issue in the promotion of electric vehicles. problem. [0003] At present, most electric vehicles use large-capacity batteries. Although the battery life of electric vehicles can be improved, the same large-capacity batteries also bring about the problem of long charging time. Although professional DC charging stations can quickly charge batteries, the high cost and large footprint make it difficult to popularize...

AI Technical Summary

Problems solved by technology

[0005] Option (1): If figure 1 and figure 2 As shown, the on-board charging and discharging device in this scheme mainly includes a three-phase power transformer 1', a three-phase bridge circuit 2' composed of six thyristor elements, a constant voltage control device AUR and a constant current control device ACR, but this scheme is seriously wasteful space and cost

[0006] Option (2): If image 3 As shown, the on-board charging and discharging device in this scheme installs two charging sockets 15' and 16' to adapt to single-phase / three-phase charging, which increases the cost; the motor drive circuit includes a filter module composed of inductor L1' and capacitor C1', When the motor is driven, the three-phase current passes through the filter module to generate loss, which is a waste of battery power; the inverter 13' rectifies / inverts the alternating current during charging and discharging in this scheme, and the voltage cannot be adjusted after rectification / inversion, which is applicable The battery operating voltage range is narrow

[0007] To sum up, most of the current AC charging technologies on the market use a single charging technology. This technology has low charging power, long charging time, large hardware size, single function, and is limited by the voltage level of power grids in different regions. shortcoming

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