Vehicle power supply SOC high-precision display method

Abstract

The invention discloses a high-precision display method for the SOC of an on-board power supply, which divides the value W charge (t) of the charging electric quantity meter by the rated electric quantity value Wmax obtained in step 4), and adds the SOC display value before charging. (t), you can calculate and display the exact value of SOC at each moment SOC charge (t), the SOC display value before discharge SOC (t) minus the value of the discharge meter value W discharge (t) divided by the step 4) The rated power value Wmax obtained in 4) can be calculated and displayed the exact value of SOC during discharge SOC discharge (t). It can be seen from the above method that the high-precision display method of vehicle power supply SOC of the present invention, the calculation method of SOC is to correct the voltage and calculate the power. Compared with the traditional SOC display method of voltage ratio, it is not only lower in cost, but also easier to implement. Moreover, the accuracy and reliability of the vehicle SOC display are also improved.

Description

technical field [0001] The invention relates to the field of SOC display in the electric vehicle industry in the modern society, in particular to a high-precision display method for the SOC of a vehicle power supply. Background technique [0002] With the development of the global economy and the increasingly prominent issues of energy and environmental protection, the automobile and other industries are transforming into an energy-saving green automobile industry. Electric vehicles have become one of the main directions for the development of energy-saving and environmentally friendly vehicles due to their advantages of zero emissions and low noise. As the key power part of electric vehicles, the importance of power batteries is self-evident. The SOC display of the power battery has become the key content of the management of the power battery, and it is an important part of the electric vehicle going to people's life. SOC, which refers to the state of charge, is used to r...

AI Technical Summary

Problems solved by technology

But there are also obvious disadvantages: first, the charge and discharge test takes a lot of time; second, the discharge test method cannot be used for working batteries.

Although this method can accurately display the remaining amount of power during driving, because it only measures the voltage value of the battery pack, as the voltage of the battery pack decreases, its power consumption is getting faster and faster. In the later stage, the value of the voltage SOC will drop to the lowest point quickly

Therefore, this method can not control the power of the battery and the endurance of the battery very well, so a new method is proposed for the display of SOC so as to be able to reflect the power of the battery pack in real time and predict the endurance of the battery pack need to wait

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