Vehicle energy management method and vehicle for electric vehicle power system

Abstract

The embodiment of the invention discloses a whole vehicle energy management method of a power system of an electric vehicle and the vehicle. The method includes: the vehicle controller receives the current power battery temperature fed back by the power battery assembly; the vehicle controller compares the current power battery temperature with a preset temperature threshold, and determines the battery usage mode according to the comparison result; The vehicle controller determines the current required power of the vehicle according to the obtained current working condition of the vehicle, and performs power allocation to the batteries in the battery usage mode according to the current required power. The above solution of the embodiment of the present invention solves the disadvantages of electric vehicles using a single power battery for power supply, effectively ensures the power demand of the whole vehicle under extreme working conditions such as low temperature environment and high temperature environment, and ensures the power and economy of the whole vehicle At the same time, it also provides effective protection for the power battery and prolongs the service life of the power battery.

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] Electric vehicles, especially pure electric vehicles, are powered by on-board power supply, and the power supply system is an important part of the power system of electric vehicles. Lithium power battery has become the mainstream power supply system of electric vehicles due to its advantages of high energy density and low environmental pollution. [0003] At present, the power supply system of electric vehicles mostly adopts a single power battery power supply scheme such as lithium power battery. [0004] The disadvantage of the existing technical solutions is that the instantaneous discharge power and charging power of power batteries such as lithium ions are easily limited due to the influence of factors such as operati...

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Problems solved by technology

[0004] The disadvantage of the existing technical solutions is that the instantaneous discharge power and charging power of power batteries such as lithium ions are easily limited due to the influence of factors such as operating temperature and electrochemical characteristics, so that short-term, high-power electric energy output or input cannot be realized. Therefore, it is difficult to meet the electric power demand under extreme working conditions such as low temperature environment, high temperature environment, rapid acceleration, rapid deceleration, etc.

In addition, if the power battery is subjected to continuous high-current output or input, its system temperature will rise, which will cause its output or input power to be limited and cannot meet the needs of users, and even irreversible electrochemical reactions will occur. reaction, which leads to the attenuation of the life of the power battery, thus increasing the use cost of the power battery

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