Two-way distributed power battery equalization management system and method

Abstract

The invention discloses a two-way distributed power battery equalization management system which comprises a battery pack, a control module, an equalization module, a data acquisition module and an upper computer. The control module comprises a microprocessor and an insulation monitoring unit which are electrically connected, and the equalization module comprises an active equalization circuit. The invention further provides a two-way distributed power battery equalization management method. The method includes the steps that the microprocessor sets a safety threshold value Vs of the voltage difference between single power batteries; the insulation monitoring unit detects whether a bus or a connecting branch of the battery pack leaks electricity or not; the data acquisition module acquirescharging and discharging current and voltage information of the single power batteries; and the microprocessor judges whether the voltage difference of any two single power batteries exceeds the safety threshold value or not and whether the battery pack leaks electricity or not. Equalization management of the multiple single power batteries is achieved, and the equalization management system is small in equalization error and high in equalization efficiency.

Description

technical field [0001] The invention relates to the technical field of management systems, in particular to a two-way distributed power battery balancing management system and method. Background technique [0002] The multi-module power battery composed of series-parallel connection is an important source of power for pure electric vehicles and plug-in hybrid electric vehicles; in order to improve the actual available capacity and repeated use times of the energy system of electric vehicles, it is necessary to ensure the composition of power battery packs; Consistency of body energy. For pure electric vehicles that use multi-module power batteries as the main power source, the inconsistency between battery modules will lead to problems such as a decrease in the estimation accuracy of the power battery SOC (State of Charge) and a decrease in mileage; discharge strategy to protect the power battery, but in complex urban road conditions, the car has to start and stop continuou...

AI Technical Summary

Problems solved by technology

For pure electric vehicles that use multi-module power batteries as the main power source, the inconsistency between battery modules will lead to problems such as a decrease in the estimation accuracy of the power battery SOC (State of Charge) and a decrease in mileage; discharge strategy to protect the power battery, but in complex urban road conditions, the car has to start and stop continuously, and it is not enough to rely solely on the charge and discharge strategy to protect the power battery; therefore, the effect of solving the battery inconsistency problem through the battery equalization circuit Better, the purpose of balancing is to make the entire battery pack; store the most electric energy under the premise of ensuring the life of the battery pack;

[0003] For the current method of solving battery consistency, there are the following problems. The equalization effect is good, but it is easy to cause excessive equalization, which is not conducive to improving the battery consistency problem. The equalization algorithm is complex and the actual engineering realization of the equalization control system and equalization circuit is difficult. And other issues

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