A two-way decentralized power battery balance management system and method

Abstract

The invention discloses a two-way decentralized power battery balance management system, which includes a battery pack, a control module, a balance module, a data acquisition module and a host computer; the control module includes a microprocessor and an insulation monitoring unit, and the microprocessor The device is electrically connected to the insulation monitoring unit, and the equalization module includes an active equalization circuit. The present invention also provides a two-way decentralized power battery equalization management method, including the steps: the microprocessor sets the safety threshold Vs of the voltage difference between the single power batteries; the insulation monitoring unit detects the busbar or connecting branch of the battery pack Whether the circuit is leaking; the data acquisition module collects the charging and discharging current and voltage information of the single power battery; the microprocessor judges whether the voltage difference between any two single power batteries exceeds the safety threshold and whether the battery pack has leakage information; the invention realizes The equalization management of multiple single power batteries, the equalization system has small equalization error and high 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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