Battery management system and balancing control method therefor, electric vehicle, and energy storage device

By combining active and passive equalization technologies in the battery management system, and using the control unit to generate drive data to control the opening and closing of each unit, the efficiency and cost issues of battery voltage consistency management are solved, and the efficiency and cost optimization of battery voltage consistency management are achieved.

WO2026144131A1PCT designated stage Publication Date: 2026-07-09HANGZHOU BMSER TECH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HANGZHOU BMSER TECH
Filing Date
2025-07-31
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

In existing battery management systems, active balancing technology has complex circuits and high costs, while passive balancing technology is inefficient and makes it difficult to achieve efficient battery voltage consistency management.

Method used

By combining active and passive balancing technologies, multiple active and passive balancing units are set up in the battery management system. The control unit determines whether active or passive balancing is needed based on the battery voltage and generates corresponding drive data to control the opening and closing of each unit, thereby achieving energy balance between battery modules.

Benefits of technology

It achieves high efficiency and cost optimization in battery voltage consistency management, reduces the overall cost of the battery management system, and improves balancing efficiency and battery life.

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Abstract

A battery management system (100), a balancing control method for a battery management system (100), an electric vehicle, and an energy storage device. The battery management system (100) comprises: a control unit (110); an analog front-end sampling unit (120); and a plurality of active balancing units (131-13n) and a plurality of passive balancing units (151-15n) correspondingly connected to a plurality of battery modules (141-14n). Each of the active balancing units (131-13n) comprises a plurality of cascaded active balancing modules, and is configured to perform control to implement energy balancing among a plurality of battery cells in a corresponding one of the battery modules (141-14n). The plurality of passive balancing units (151-15n) are configured to perform control to implement energy balancing among the plurality of battery modules (141-14n).
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