A Novel Lithium-ion Battery Balancing Strategy Based on Global Best-First and Integrated Imbalance Calculation

摘要

Lithium-ion battery is the development trend in the airborne and automotive applications, butthere are constraint technical security risk issues. The spontaneous combustion and other safetyhazards of the lithium-ion battery are mainly caused by the imbalance of monomers in thelithium-ion battery packs. In order to solve the imbalance problems in the lithium-ion batterymonomers that exist during the charging and discharging process, a novel lithium-ion batterybalancing strategy is proposed based on the global best-first balancing strategy and integratedimbalance calculation analytical methodology. This strategy analyzes the variation of the cellvoltage and capacity of the lithium-ion battery which are two key characteristic factors for thebalancing adjustment. The integration effect degrees of these two core factors are determined forseeking the optimal balancing path to achieve the active equalization of the lithium-ion batteryunder charging, discharging and shelving conditions. The experimental results show that, theintegrated imbalance degree of remaining capacity and terminal voltage of the battery monomeris no greater than 8% and the real-time active equalization goals of the lithium-ion battery underdifferent operating conditions are achieved through the equalization adjustment system (EAS)design and implementation, providing security protection for the lithium-ion battery application.