Energy storage battery equalization device and equalization method

By using a main control chip and a bidirectional converter in the energy storage battery, the problems of complex active balancing circuits and easy damage of DC/DC unidirectional converters are solved, achieving a battery balancing effect that is simple in circuit, low in cost, and small in size.

CN117713286BActive Publication Date: 2026-09-25GUANGZHOU JUNNENG TECH CO LTD
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Patent Information

Application Number
CN202311624054.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-29
Publication Date
2026-09-25
Estimated Expiration
2043-11-29

AI Technical Summary

Technical Problem

Existing active balancing circuits are complex and costly, and the high-voltage side of DC/DC unidirectional converters is prone to damage, while DC/DC unidirectional converters occupy a large volume.

Method used

An energy storage battery balancing device is adopted, including a main control chip, a bidirectional converter and a low-voltage bus. The main control chip calculates the charge value of individual cells, selects the cells with the highest and lowest charge values, and controls the bidirectional converter to boost or buck the voltage to achieve energy transfer. The low-voltage bus is used to store and release electrical energy to regulate the voltage.

Benefits of technology

It achieves a simple circuit, low cost, low voltage on both sides of the bidirectional converter, is not easily damaged, has a small size, flexible layout, and can effectively balance the voltage of individual batteries.

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Abstract

The application relates to the technical field of lithium batteries, in particular to a storage battery equalization device and an equalization method. The storage battery equalization device comprises a main control chip, a storage battery pack, a plurality of bidirectional converters and a low-voltage bus; a plurality of single batteries of the storage battery pack are arranged in correspondence with the plurality of bidirectional converters; the main control chip can calculate the electric quantity value of each single battery and screen out the single batteries with the highest and lowest electric quantity values; when the difference between the highest and lowest electric quantity values reaches a predetermined electric quantity value, the main control chip controls the bidirectional converter corresponding to the single battery with the highest electric quantity value to step up to the low-voltage bus, and controls the bidirectional converter corresponding to the single battery with the lowest electric quantity value to step down to the single battery. The storage battery equalization device and the equalization method solve the problems that the existing active equalization circuit is complex, the cost is high, the high-voltage side of the unidirectional converter is prone to damage, and the unidirectional converter occupies a large volume.
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