Bidirectional active equalization BMS circuit and control method thereof

Abstract

The invention discloses a bidirectional active equalization BMS circuit. The BMS circuit comprises a battery pack with n single batteries, n same secondary circuits, a transformer T1, a primary circuit and a control chip U10; the transformer T1 comprises a primary winding with a first tap, a second tap and a third tap, and n secondary windings with a first tap, a second tap and a third tap; and the primary winding is connected with the primary circuit, the n secondary windings are respectively and correspondingly connected with one sides of the n same secondary circuits, the other sides of then secondary circuits are respectively connected with the n single batteries in parallel, and n is greater than or equal to 2. According to the invention, the energy with relatively high single energyis transferred to the battery with relatively low energy through the energy storage link in a bidirectional charging and discharging manner, so that active equalization is realized, and the energy loss is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a bidirectional active balanced BMS circuit and a control method thereof. Background technique [0002] With the vigorous development of the new energy vehicle industry and the wide application of lithium-ion batteries, the role of lithium-ion battery packs is becoming more and more important. In order to ensure the consistency of the cell capacity balance between battery packs and avoid shortening the service life of the battery pack due to the energy imbalance of the single cells between the battery packs, the balance of the cell capacity between the battery packs has become an indispensable and important aspect in many product designs. Features. Traditional battery pack equalization circuits use passive energy consumption to balance the capacity of individual cells between battery packs, and use the circuit itself to consume large power consumption. Although the struct...

AI Technical Summary

Problems solved by technology

Traditional battery pack equalization circuits use passive energy consumption to balance the capacity of individual cells between battery packs, and use the circuit itself to consume large power consumption. Although the structure is simple and the cost is low, the resistance energy consumption generates heat, and the entire system Efficiency is reduced, so a BMS circuit with less energy loss is required

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