Whole vehicle energy management method of electric vehicle power system and vehicle

Abstract

The embodiment of the invention discloses a whole vehicle energy management method of an electric vehicle power system and a vehicle. The method comprises the following steps that a whole vehicle controller receives the current power battery temperature and the current fuel cell temperature which are sent by a power battery assembly and a fuel cell assembly correspondingly; the whole vehicle controller compares the current power battery temperature and the current fuel cell temperature with a preset temperature threshold value, and battery use modes are determined according to comparison results; and the whole vehicle controller determines the current demand power of the vehicle according to the obtained vehicle current working condition, and performs power distribution on a battery underthe battery use mode according to the current demand power. By means of the embodiment of the whole vehicle energy management method of the electric vehicle power system and the vehicle, the scheme overcomes defects which are caused because only the power battery and / or the fuel cell is used by an electric vehicle for power supply; and while the power performance and economy of the whole vehicleare guaranteed, the fuel cell and the power battery are effectively protected, and the service life of the fuel cell and the power 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] The power system is an important part of the power system of electric vehicles. Lithium power batteries have become the mainstream power system of electric vehicles due to their advantages of high energy density and low environmental pollution. Fuel cells have high energy density, zero pollution emissions, and high efficiency. , low noise and other advantages, which also produced fuel cell electric vehicles. [0003] At present, the power supply system of electric vehicles either adopts a single power battery power supply scheme such as a lithium power battery, or a single fuel cell power supply scheme, and also has a fuel cell and power battery hybrid power supply scheme. [0004] The disadvantage of the technical solution...

AI Technical Summary

Problems solved by technology

[0004]The disadvantage of using only power batteries and / or fuel cells for power supply is that the instantaneous discharge power and charging power of power batteries such as lithium Due to the influence of chemical characteristics and other factors, it is impossible to achieve short-term, high-power electric energy output or input, so it is difficult to meet the electric power demand under extreme working conditions such as low temperature environment, high temperature environment, rapid acceleration, and rapid deceleration; The output power of the battery is also 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. The normal output power is only within a certain temperature range, so it cannot meet extreme conditions such as low temperature and high temperature. power output under

In addition, continuous high-current output or input may cause irreversible electrochemical reactions in the power battery, which will lead to attenuation of the life of the power battery and increase the cost of use; while frequent start and stop of the fuel cell will shorten the life of the fuel cell and affect durability

Images