Storage battery balance system and balance control method

Abstract

The application discloses a storage battery balance system and a balance control method. The system comprises a storage battery balance circuit and a controller; the storage battery balance circuit comprises balance circuit units in one-to-one corresponding connection with monomer batteries, each balance circuit unit comprises a full-bridge circuit composed of four switch tubes, a transformer winding connected with the output side of the full-bridge circuit, a resonance capacitor in series connection with a leakage inductance of the transformer winding to form a resonant cavity, and controllable switches connected with the resonance capacitor in parallel; the transformer winding of each balance circuit unit is a mutual-coupling winding having the same turns on the same transformer magnetic core; the controller is used for controlling the controllable switch corresponding to the lowest energy to be closed and the controllable switch corresponding to the highest energy to be opened while detecting that the energies of the unit batteries are imbalance, and opening the pulse control on the full-bridge circuit corresponding to the highest energy, and repeatedly detecting whether the energies of the unit batteries are balanced after the pulse control is finished, so that the loseless balance is realized.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, relates to a storage battery pack equalization system and an equalization control method. Background technique [0002] For a battery pack composed of single cells connected in series, inconsistent charge and discharge of each single cell is an important factor leading to a decrease in the service life of the battery pack. [0003] The existing technology uses the parallel connection of single battery resistors to bypass excess electric energy, but this method of dissipating excess electric energy in the form of heat to achieve energy balance between individual batteries is a lossy balance, which is not conducive to energy saving and Environmental protection, and the converted heat will bring a burden to the thermal management of the battery pack. Contents of the invention [0004] In view of this, the present invention provides a storage battery pack equalizat...

AI Technical Summary

Problems solved by technology

[0002] For a battery pack composed of single cells connected in series, inconsistent charge and discharge of each single cell is an important factor leading to a decrease in the service life of the battery pack

[0003] The existing technology uses the parallel connection of single battery resistors to bypass excess electric energy, but this method of dissipating excess electric energy in the form of heat to achieve energy balance between individual batteries is a lossy balance, which is not conducive to energy saving and Environmental protection, and the converted heat will bring a burden to the thermal management of the battery pack

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