Power supply device and method for electric vehicle

Abstract

The invention discloses a power supply device and a power supply method for an electric vehicle. The power supply device comprises a high power type battery, a high energy type battery and a control unit, wherein the control unit is used for detecting the output power of a driving motor of the electric vehicle; when the control unit detects that the output power of the driving motor is within a first preset power range, the high power type battery and the high energy type battery are controlled to discharge simultaneously; when the control unit detects that the output power of the driving motor is within a second preset power range, the high power type battery is controlled to discharge separately; when the control unit detects that the output power of the driving motor is within a third preset power range or the electric vehicle travels at a constant speed, the high energy type battery is controlled to discharge separately; the minimum value of the first preset power range is greater than the maximum value of the second preset power range and the maximum value of the third preset power range, and the minimum value of the second preset power range is greater than the maximum value of the first preset power range. By the technical scheme, and both the dynamic property and the endurance mileage of the electric vehicle are improved.

Description

technical field [0001] The present invention relates to the technical field of electric vehicles, in particular to a power supply device and method for electric vehicles. Background technique [0002] At present, many electric vehicles use high-voltage batteries as the power source and energy storage device of the vehicle. Most high-voltage batteries for electric vehicles use high-energy or high-power batteries, among which high-energy batteries have a higher discharge rate. High power types each have a higher energy density. Batteries for electric vehicles are generally divided into two directions, high-power batteries and high-energy batteries. However, the above two batteries have their own advantages and disadvantages. Specifically, in the case of the same battery pack volume: the high-power battery has a higher discharge rate, which will make the vehicle have better power performance, but due to the lower energy density Low battery will lead to low mileage of the veh...

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Problems solved by technology

However, the above two batteries have their own advantages and disadvantages. Specifically, in the case of the same battery pack volume: the high-power battery has a higher discharge rate, which will make the vehicle have better power performance, but due to the lower energy density Low battery will lead to low mileage of the vehicle; while high-energy batteries have higher energy density, which will make the vehicle have better mileage, but due to the low discharge rate, the power performance of the vehicle will be low

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