Class
Article
College
College of Engineering
Department
English Department
Faculty Mentor
Regan Zane
Presentation Type
Oral Presentation
Abstract
This work introduces a composite hybrid energy storage system (CHESS) architecture that combines energy-dense and capacitively-coupled power-dense battery packs in a unique configuration that requires minimal energy balancing using low-power DC-DC converters. A power-dense battery is coupled to an energy-dense battery using a relatively small supercapacitor module that naturally distributes the system current between the two packs, requiring no additional contactors or full-power processing DC-DC converters. A design procedure is developed to size the system for plug-in hybrid and battery electric vehicles (PHEVs and BEVs). The procedure results in designs that achieve weight reduction for a PHEV/BEV battery-energy-storage system (ESS) under given constraints in both theoretical limits and practical scenarios. The result is that the CHESS architecture, the first of its kind capacitively-coupled BESS, extends vehicle range and battery lifetime by fully utilizing the combined capabilities of energy-dense and power-dense battery packs. A design example is provided based on a PHEV with a 64-mile range evaluated over the US06 drive cycle. The design achieves a 40% weight reduction compared to a conventional system using single-chemistry cells. Experimental results verifying the natural distribution of the system current between the energy-dense and the power-dense packs are provided for a 100 kW, 20 kWh prototype with 50 Ah NMC and 2.9 Ah LTO battery cells, and a 44 F supercapacitor.
Location
Logan, UT
Start Date
4-9-2022 12:00 AM
A Novel Composite Hybrid Energy Storage System for Hybrid and Electric Vehicles
Logan, UT
This work introduces a composite hybrid energy storage system (CHESS) architecture that combines energy-dense and capacitively-coupled power-dense battery packs in a unique configuration that requires minimal energy balancing using low-power DC-DC converters. A power-dense battery is coupled to an energy-dense battery using a relatively small supercapacitor module that naturally distributes the system current between the two packs, requiring no additional contactors or full-power processing DC-DC converters. A design procedure is developed to size the system for plug-in hybrid and battery electric vehicles (PHEVs and BEVs). The procedure results in designs that achieve weight reduction for a PHEV/BEV battery-energy-storage system (ESS) under given constraints in both theoretical limits and practical scenarios. The result is that the CHESS architecture, the first of its kind capacitively-coupled BESS, extends vehicle range and battery lifetime by fully utilizing the combined capabilities of energy-dense and power-dense battery packs. A design example is provided based on a PHEV with a 64-mile range evaluated over the US06 drive cycle. The design achieves a 40% weight reduction compared to a conventional system using single-chemistry cells. Experimental results verifying the natural distribution of the system current between the energy-dense and the power-dense packs are provided for a 100 kW, 20 kWh prototype with 50 Ah NMC and 2.9 Ah LTO battery cells, and a 44 F supercapacitor.
