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

Abstract

The embodiments of the invention disclose a vehicle energy management method for an electric vehicle power system, and a vehicle. The vehicle energy management method comprises the steps: a vehicle controller receives the current power battery temperature fed back by a power battery assembly; the vehicle controller compares the current power battery temperature with a preset temperature thresholdvalue, and a battery using mode is determined according to the comparison result; and the vehicle controller determines the current demanded power of the vehicle according to the obtained current working condition of the vehicle, and conducts power distribution on batteries in the battery using mode according to the current demanded power. According to the schemes of the embodiments, the disadvantages caused by the fact that an electric vehicle adopts a single power battery for power supply are overcome, the power demands of the vehicle under the extreme working conditions such as a low-temperature environment and a high-temperature environment are effectively met, the power batteries are also effectively protected while the power performance and economical efficiency of the vehicle are ensured, and the service life of the power batteries 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] 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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