Composite active equalization circuit and method for battery system of energy storage power station

By adopting a composite active equalization circuit in the battery energy storage system, combined with the equalization technology within and between PACK, the problem of low power equalization efficiency is solved, and efficient power equalization and charging and discharging efficiency is achieved.

CN119696107APending Publication Date: 2025-03-25FOSHAN HECHU ENERGY TECH CO LTD
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Patent Information

Application Number
CN202411834317.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-13
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The prior art is difficult to achieve efficient power balance in battery energy storage systems, especially between single cells and between different battery PACKs, resulting in battery capacity loss and temperature increase, affecting the service life of the battery energy storage system.

Method used

The composite active equalization circuit is adopted, combined with the active equalization between the single-cell battery cells in PACK and the full current control technology between PACK to achieve coordinated control inside and outside the battery system and improve the battery equalization efficiency.

Benefits of technology

Through the composite active equalization strategy, the speed and efficiency of power equalization are significantly improved, the equalization current of more than 100A is achieved, and the charging and discharging efficiency and safety of the battery energy storage system are optimized.

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Abstract

The invention relates to the technical field of battery management, and discloses a composite active equalization circuit and method for a battery system of an energy storage power station, each battery PACK is connected with a battery cell active equalization circuit, the battery cell active equalization circuit comprises a plurality of power switch modules, each power switch module corresponds to each single battery cell in the battery PACK, and the power switch modules are connected with the battery cell active equalization circuit. Electric quantity balance among the single battery cells is realized through on and off control of different power switch modules; each battery PACK is connected with a PACK total current control circuit, and the PACK total current control circuit is coupled with the battery cell active equalization circuit; and the PACK total current control circuit is used for balancing the electric quantity among different battery PACKs in the battery cluster. According to the invention, through a composite electric quantity equalization strategy that active equalization is adopted between the single cells in the PACKs and a total current control equalization technology is adopted between the PACKs, cooperative control of circuits between the single cells and between the PACKs is realized, and the electric quantity equalization efficiency and the charging and discharging efficiency of the battery system are improved.
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