Battery pack balancing control system and control method on basis of dynamic balance point

Abstract

The invention discloses a battery pack balancing control system and a control method on the basis of a dynamic balance point. The system comprises a battery pack, a voltage sampling circuit, a balancing main circuit and a balancing control circuit. The balancing control circuit is used for comparing a voltage value of each single battery and respectively regulating frequencies of power switch tubes corresponding to the single batteries and controlling the frequencies of the power switch tubes to track a balance frequency of the battery pack in a dynamic balance state when a voltage difference of different single batteries exceeds a preset threshold value, wherein the dynamic balance state is a state when energy released by each battery of the battery pack and energy adsorbed by the battery in each switching period are equal; and the balance frequency is the frequency of each power switch tube in the dynamic balance state. According to the invention, all the single batteries in the battery pack can almost simultaneously reach balance, the balancing speed and efficiency are improved, overcharge and over-discharge damage caused by inconsistency of the single batteries is prevented, and service life of the battery pack is prolonged.

Description

technical field [0001] The invention relates to the technical field of battery voltage equalization, in particular to a battery pack equalization control system and control method based on a dynamic equalization point. Background technique [0002] Due to the increasingly serious energy crisis and environmental pollution, the development space of new energy technology is becoming wider and wider, and the demand for new energy technology is more urgent all over the world. For example, lithium batteries have the advantages of high energy density, high power density, long service life and high cost performance, and have strong development potential in the field of new energy applications. The rated voltage of a lithium battery cell is about 3.65V. In order to meet the voltage requirements of a pure electric vehicle, a large number of single cells are usually connected in series to provide sufficient power. However, the series connection of batteries also causes some problems, ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a battery pack equalization control system and control method that can improve the battery pack equalization speed and efficiency in view of the defect that the battery pack cannot be effectively balanced in the prior art.

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