Equalizing charging circuit for battery pack, and control circuit for equalizing charging circuit

Abstract

The invention relates to the technical field of power, and especially relates to an equalizing charging circuit for a battery pack, and a control circuit for an equalizing charging circuit. Based on the above equalizing structure, an inversion module is started for charging a low-voltage battery unit when voltage of the battery unit is too low, and then a chopping module is used for charging the whole body, thereby completing the equalization of key tasks. When the voltage of the battery unit is too high, the chopping module is started at first, and enables the electric quantity of the high-voltage battery unit to be transferred to other low-voltage battery unit, and then the inversion module is used for charging the whole body, thereby achieving the equalizing charging. According to the scheme, the two modules cooperate with each other, thereby reducing the equalizing time, guaranteeing the equalizing precision, avoiding a condition that a single module cannot adapt to various types of imbalance conditions and achieves the equalizing function and effect improvement.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a battery pack equalizing charging circuit and its control structure. Background technique [0002] During the normal operation of the power system, it is inevitable to encounter unexpected situations such as power outages and voltage instability, which lead to the need to cut off the power supply to ensure the safety of the equipment. In order to avoid abnormal operation of power equipment caused by cutting off the power supply, it is often necessary to use Various types of battery energy storage systems, battery energy storage systems as backup power sources and energy storage devices are an important part of the power industry. With the improvement of battery types and performance, the capacity and power of batteries continue to increase, but At this stage, the capacity of a single battery and the ability to store power are still insufficient to meet the voltage and po...

AI Technical Summary

Problems solved by technology

Especially in the past ten years, equalization strategies based on various types of circuits and electronic devices have emerged, but there are various deficiencies due to the limitations of circuit structures and electronic components: for example, the LC oscillation circuit equalization strategy based on the principle of power transfer Due to the large number of switches, the control circuit is complex and the loss is large; although the equalization strategy based on the chopper circuit has a higher transfer efficiency in a battery pack with fewer single cells, its overall balance power transfer efficiency is still low. low, not suitable for large battery packs

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