Energy transfer two-way balancing system based on power inductor and control method thereof

Abstract

The invention discloses an energy transfer two-way balancing system based on a power inductor and a control method of the energy transfer two-way balancing system based on the power inductor. The energy transfer two-way balancing system based on the power inductor comprises a data acquisition module, a master control module, a communication module, a balancing module and a driver module, and a two-way balancing circuit topology structure which uses the power inductor as an energy transfer medium is selected. According to the general balancing thinking of the energy transfer two-way balancing system based on the power inductor and the control method of the energy transfer two-way balancing system, the data acquisition module carries out real-time detection on voltage of batteries in a battery pack and electric current of buses in the battery pack, and identifies the working state of the battery pack, inconsistency judgment is carried out through balance variables determined in advance and balance indexes determined in advance, balancing is carried out according to an established control strategy when balance conditions are met, the states of the batteries are continuously monitored, and balancing is stopped until stop conditions are met. Energy can be transferred from the battery with higher voltage to the battery with lower voltage and adjacent to the battery with the higher voltage through control over a switch of an MOSFET corresponding to the battery with the higher voltage, and the magnitude of balanced current is related to the closing time of the corresponding MOSFET. The energy transfer two-way balancing system based on the power inductor can carry out pending balancing, charging balancing and discharging balancing, achieve efficient and comprehensive balancing, and finally solve the problem that the batteries are not consistent in the process of use.

Description

technical field [0001] The invention relates to a power inductance-based energy transfer bidirectional equalization system and a control method thereof, which are suitable for pure electric vehicles and belong to the technical field of energy equalization of lithium-ion power battery packs. Background technique [0002] Power battery is the energy carrier of pure electric vehicles, and its related technology is one of the core technologies of pure electric vehicles. At present, power batteries have a series of problems such as high cost, short service life and poor safety, which need to be solved urgently. However, due to the complex characteristics of the battery itself, its technical breakthrough is more difficult than the vehicle control technology and drive motor technology, making the power battery a bottleneck restricting the wide-scale application of pure electric vehicles. [0003] Power batteries usually use multiple single cells connected in series to supply power ...

AI Technical Summary

Problems solved by technology

[0005] One object of the present invention is to provide a bidirectional equalization system for energy transfer based on power inductors, and another object is to provide a control method for the system to solve the problem of inconsistency of the battery cells in the lithium-ion battery pack during use. Extend the service life of the battery pack and increase the mileage

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