Battery parallel capacity expansion circuit, control method and energy storage device

By setting up control units between battery packs and using the battery management system to detect voltage differences and control switching elements, the circulating current problem when power battery packs are directly connected in parallel is solved, realizing safe and intelligent battery capacity expansion and improving system efficiency and safety.

CN121812786APending Publication Date: 2026-04-07SHENZHEN YONGHANG NEW ENERGY TECH
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Patent Information

Application Number
CN202512031354.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

In existing technologies, when power battery packs are directly connected in parallel, the difference in parameters such as voltage leads to circulating current, which causes energy loss, reduced system efficiency, battery pack overheating and safety risks, limiting the improvement of the total capacity of the battery system and making it difficult to meet the needs of long-range and large-capacity power systems.

Method used

By setting up first and second control units between the battery packs, the battery management system can detect the voltage difference in real time and control the switching elements to achieve safe and intelligent parallel power supply of the battery packs and avoid circulating current.

Benefits of technology

It enables safe and intelligent capacity expansion of multiple battery packs, avoids energy loss and battery overheating, extends battery pack life, and meets the needs of long-range and high-capacity power systems.

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Abstract

The invention provides a battery parallel capacity expansion circuit, a control method and an energy storage device, and relates to the technical field of batteries, and the battery parallel capacity expansion circuit comprises a first control unit and a second control unit which are respectively used for carrying out discharge control on a first battery pack and a second battery pack; the battery management system is used for detecting the voltage of the first battery pack and the second battery pack in real time, and when the voltage difference value of the two is larger than a first preset voltage threshold value, the switch element in the control unit corresponding to the high-voltage battery pack is closed, and the switch element in the control unit corresponding to the low-voltage battery pack is disconnected. The high-voltage battery pack independently supplies power to the load; and when the voltage difference value is smaller than a first preset voltage threshold value, all switching elements in the first control unit and the second control unit are closed and are connected in parallel to supply power to a load. By implementing the technical scheme provided by the invention, the safety effect of improving the capacity expansion of the battery is achieved.
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