Vehicle energy management method for electric vehicle power system, and vehicle

Abstract

The embodiment of the invention discloses a vehicle energy management method for an electric vehicle power system, and a vehicle. The method comprises the following steps that a vehicle control unit receives a current fuel battery temperature fed from a fuel battery component; the vehicle control unit compares the current fuel battery temperature with a preset temperature threshold value, and determines a battery use mode according to a comparison result; and the vehicle control unit determines the current demanded power of the vehicle according to the obtained current working condition of thevehicle, and carries out power distribution on a battery under the battery use mode according to the current demanded power. By use of the above scheme of the embodiment of the invention, defects generated since an electric vehicle adopts a single fuel battery to supply electricity are eliminated, the power demands of the vehicle under ultimate working conditions, including low-temperature startup, a high temperature and the like, can be effectively guaranteed, effective protection is provided for the fuel battery while the dynamic property and the economic efficiency of the vehicle are guaranteed, and the service life of the fuel battery is prolonged.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electric vehicles, and in particular to a vehicle energy management method for a power system of an electric vehicle and a vehicle. Background technique [0002] Fuel cells have the advantages of high energy density, zero pollution emissions, high efficiency, low noise, etc., resulting in fuel cell electric vehicles. [0003] The power supply system is an important part of the power system of electric vehicles. At present, the power supply system of fuel cell electric vehicles mostly adopts the fuel cell, a single type of battery-powered solution. [0004] The disadvantages of the existing technical solutions are: firstly, the output power of the fuel cell is greatly affected by the working temperature, the low-temperature time-limited power may or may not output power, and the high-temperature time-limited power may or may not output power, and the normal output power is only within...

AI Technical Summary

Problems solved by technology

[0004]The disadvantages of the existing technical solutions are: firstly, the output power of the fuel cell is greatly affected by the working temperature, the low temperature time limit power or no output power, and the high temperature time limit power or not Output power, only in a certain temperature range can the normal output power, thus unable to meet the power output under extreme working conditions such as low temperature and high temperature

Secondly, the dynamic power response of the fuel cell is slow, and it is impossible to achieve short-term, high-power electric energy output, that is, the instantaneous output power is low, so it cannot meet the power output of the vehicle under extreme working conditions such as starting, climbing, and rapid acceleration. need

Furthermore, the fuel cell itself can only generate energy and cannot store energy. Therefore, this solution cannot realize the energy recovery of the whole vehicle when the vehicle is coasting or braking.

In addition, the fuel cell may need to be shut down when the power demand of the vehicle is low or deceleration, and the frequent start and stop of the fuel cell will shorten the life of the fuel cell and affect the durability

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