Abstract: Scientific and reliable battery management system(BMS) is the key to the safe and efficient application of lithium-ion battery energy storage system. Traditional BMSs have few computing resources and weak data processing ability, which limit the application of intelligent management and control algorithms and high-fidelity models. Characterized by the integration of information and physics, the digital twin brings a new opportunity for the development of BMSs. By establishing a digital twin mapping with the battery physical entity, the development of intelligent battery management system can be realized through the interactive feedback of virtuality and reality and the fusion of mechanism and data. Technical system and functions of digital twin, including data support layer, modeling and computing layer, functional application layer, and human-computer interaction layer are systematically introduced. The key technologies such as model modeling, data and mechanism model fusion in battery digital twin construction are analyzed. On this basis, the design framework of lithium-ion BMS based on the digital twin technology is clarified, aiming to provide the guidance and reference for the research of building intelligent management system.