METHOD FOR REASONABLY ADJUSTING DISCHARGE CUT-OFF VOLTAGE OF LITHIUM BATTERY ALONG WITH BATTERY LIFE ATTENUATION

摘要

A method for reasonably adjusting a discharge cut-off voltage of a lithium battery along with battery life attenuation, comprising: obtaining a charge cut-off voltage, a discharge cut-off voltage, and a rated capacity on the basis of a lithium battery basic parameter table, then setting a safe charge cut-off voltage and a safe discharge cut-off voltage to obtain an initial safe discharge capacity, and finally setting a preset discharge capacity of the battery; estimating a discharged capacity by using an ampere-hour integral method, using the preset discharge capacity as a discharge standard, and stopping discharging when the discharged capacity reaches the preset discharge capacity; enabling the safe discharge capacity in a battery life cycle to be gradually smaller than the preset discharge capacity, and enabling the battery to stop discharging when the voltage reaches the safe discharge cut-off voltage. The stability of an output capacity under the condition of battery capacity attenuation is ensured by controlling a discharge capacity to be unchanged, so that a user feels that the endurance mileage of an electric vehicle is stable and unchanged within a certain period, and the characteristics of a simple adjustment and control method and convenience in commercialization are provided.