A control method for an electric vehicle supplementary lithium battery pack equalization device

Abstract

A control method for an electric vehicle supplementary lithium battery pack equalization device, comprising the following steps: when the power battery pack is charging, the ECU records the charging current of the battery pack and the terminal voltages of all single cells within a period of time; when the power battery pack When any one of the single cells is fully charged, the charging stops, and the ECU records the change data of the terminal voltage of all the single cells within a period of time after the charging current is 0; The distance to fully charge the required power data; the ECU reads the stored supplementary power data of all single cells in the power battery pack, and starts the supplementary lithium battery pack balancing device to adjust the power of the single cells that are seriously behind. Carry out supplementary electricity; measure and judge each time the battery pack is charged, perform equalization when discharging, and execute the above steps cyclically. The invention is suitable for the synchronous control of the charging cut-off point of the battery pack, and is efficient and fast, and the system responds quickly.

Description

technical field [0001] The present invention relates to a control method for an equalizing device of a supplementary electric lithium battery pack for an electric vehicle, in particular to using a special supplementary electric equalization circuit to control the consistency of the lithium battery pack of an electric vehicle, and to reduce the loss of the battery pack due to differences in the cells. resulting in capacity loss. Background technique [0002] Due to material characteristics, manufacturing process, working conditions, and aging and decline, after lithium batteries are grouped, with the increase in the number of uses, the capacity, remaining power, and internal resistance of the single battery have differences and gradually expand, resulting in lithium batteries. The performance of the battery pack has deteriorated. A variety of equalization methods have been proposed in the industry, but usually only the current state of the battery is used to judge the equali...

AI Technical Summary

Problems solved by technology

[0002] Due to material characteristics, manufacturing process, working conditions, and aging and decline, after lithium batteries are grouped, with the increase in the number of uses, the capacity, remaining power, and internal resistance of the single battery have differences and gradually expand, resulting in lithium batteries. Battery Pack Deterioration

A variety of equalization methods have been proposed in the industry, but usually only the current state of the battery is used to judge the equalization, which is likely to cause large equalization errors and the equalization effect is not obvious

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