Vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method

Abstract

The present invention provides a vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method. In the certain environment temperature T set, the battery is charged to 50% of rated capacity, and the battery is continuously charged and the corresponding battery voltage U1, the battery temperature T1 and the battery charging capacity C charge are recorded, after the discharging is finished, the capacity test is performed to obtain the discharging capacity C actuality_1, the actual charge maintenance SOC actuality_1 and the voltage U pair_1 corresponding to the SOC actuality_1 at any moment between the 50% and 100% of the carried charge of a power battery pack are obtained through calculation according to the corresponding format; and the battery is charged to the 50% of the rated capacity, and the battery is discharged and the corresponding battery voltage U2, the battery temperature T2 and the battery discharge capacity C discharging are recorded, the capacity test is tested to obtain the discharge capacity C actuality_2, and the actual charge maintenance SOC actuality_2 and the voltage U pair_2 corresponding to the SOC actuality_2 at any moment between the 50% and 100% of the carried charge of a power battery pack are obtained through calculation according to the corresponding format. The vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method is accurate and reliable, and can avoid battery abusing.

Description

technical field [0001] The invention relates to a method for determining the real charge retention and corresponding voltage of a battery, in particular to a method for determining the real charge retention and corresponding voltage of a nickel-metal hydride power battery pack for a vehicle. Background technique [0002] The 21st century is an era when human society is facing challenges of energy shortage and environmental pollution control: oil resources are decreasing year by year, oil prices are gradually rising, reducing automobile pollution and saving energy have become serious problems faced by governments all over the world. Due to battery technology and cost issues, the development of hybrid electric vehicles is the trend of the situation. In a hybrid vehicle, due to the use of a high-power energy storage device to provide instantaneous energy to the vehicle, the size of the engine can be reduced, efficiency can be improved, emissions and fuel consumption can be redu...

AI Technical Summary

Problems solved by technology

The existing evaluation method for the SOC usage interval of the nickel-metal hydride power battery pack for HEV is to monitor and manage the SOC usage interval through the BMS. At present, the Ah integration method and the voltage correction at both ends are mainly used. However, the SOC estimation Ah integration increases with the usage time , temperature, current and other factors make it impossible to get a relatively accurate battery SOC value

The accuracy of the terminal voltage as the last line of defense of the BMS is particularly important. At present, the main technical difficulties in the calibration of the terminal voltage are as follows: (1) It is impossible to accurately know the SOC state corresponding to the terminal voltage during the test; (2) Calibration time and temperature As a result, the terminal voltage in the SOC state is not the real value at the temperature set by the test