Residual charge calculation of lead-acid battery:
Most occasions using VRLA need to know the remaining power information in the discharge process, this information may be expressed in percent or remaining working time. Some operations need to be done before the battery is depleted, shutting down the equipment or starting other power generation equipment. The residual discharge of VRLA after full charge is related to the degree of deterioration of the battery, which is related to the power supply and temperature of the discharge, especially at high magnification.
The SOC-related research focuses on the "fuel Gauge" (gauge) of the electric vehicle (ev-electrical Vehicle), which must accurately indicate the remaining power to recharge in a timely manner, and the effect of variable current usage and braking power back on the EV makes the SOC calculation more complex.
There are several methods of SOC calculation:
1. Voltage-Power corresponds. Curtis, the world's largest manufacturer of battery meters, uses a voltage-electricity response.
2. Time integration method. According to the characteristics of battery used in electric vehicle, the method of calculating the compensation coefficient is studied.
3. Peukert law. It is difficult to determine the coefficients of a method for calculating the capacitance of electricity under different current and temperature. There is no evidence that the law is still valid for a battery that has deteriorated to a certain extent.
4. Impedance analysis. Kenneth Bundy and other people through the analysis of impedance spectrum data to predict Ni-MH (NI/MH) Battery SOC, the maximum error is 7% predictive effect, Alvin j.salkind and so on using fuzzy logic algorithm, analysis of 3 different frequencies of the impedance imaginary part of the prediction LI/SO2 and ni/ MH Battery SOC also obtained 5% accuracy.