Abstract:
In battery systems, the electrical connections between the voltage nodes and battery management system are typically implemented with a single wire per node to limit the ...Show MoreMetadata
Abstract:
In battery systems, the electrical connections between the voltage nodes and battery management system are typically implemented with a single wire per node to limit the system cost, resulting in limited voltage sampling frequency and reduced effective balancing power rating. An augmented equivalent circuit model for Lithium-ion battery packs is proposed that incorporates the parasitic cell connection resistance and improves the state-of-charge and available power estimation accuracy during continuous cell balancing. A new cell connection resistance extraction technique is introduced that leverages an existing isolated Čuk converter designed for active cell balancing. Simulation results estimate a potential elimination of 6.7% state-of-charge estimation drift per hour, when cell balancing is active. The wire resistance extraction technique is demonstrated experimentally in a 4kWh custom liquid-cooled battery module with a prototype battery management system.
Date of Conference: 23-26 June 2020
Date Added to IEEE Xplore: 07 August 2020
ISBN Information:
Print on Demand(PoD) ISSN: 2377-5483