Rolled-Ribbon™ Large Format Battery Architecture for Plug-In Hybrid Vehicles
TP-AAB-AABC_2009_P_18
06/10/2009
- Content
- InvenTek has conducted a series of validation tests of the Rolled-Ribbon™ cell format benchmarked against 18650-size cylindrical cell architecture, with cell chemistry held constant and cell capacity normalized. This evaluation has enabled InvenTek to perform a baseline quantification of its internal resistance improvement, and predict the potential cost reductions by requiring less cell chemistry. Test results have confirmed a 30-40% reduction in internal resistance, as well as a lower cell temperature rise. The Rolled-Ribbon™ cells were able to achieve Crates as high as 15C for a 30 second pulse, whereas the cylindrical cells were unable to achieve a 30 sec pulse capability at 15C rate. At best they were able to sustain 10C for 30 sec pulse. InvenTek seeks to perform testing with alternative chemistries and architectures in the coming months. Rolled-Ribbon™ has demonstrated improved deep cycle life stability at greater than 1000 cycles with reduced performance loss. In addition, safety and lifetime testing is currently in progress to validate the technology for use in hybrid and electric vehicle batteries. Due to the simplicity of Rolled-Ribbon™ and the lack of welding, ease of deconstruction will enable advanced battery recycling for a higher end-of-life value. Preliminary investigation with OnTo Technology LLC shows potential for recovering at least 2/3 of battery material value in recycling. InvenTek has additional built a 220V, 1.5kWh prototype Rolled-Ribbon™ battery pack and replaced the OEM NiMH pack in a Toyota Prius™. The primary objective of this field testing is to demonstrate the viability of the Rolled-Ribbon TM battery architecture for hybrid vehicles, without using an active thermal management.
- Citation
- Kaun, T., Kaun, B., and Starcevich, J., "Rolled-Ribbon™ Large Format Battery Architecture for Plug-In Hybrid Vehicles," SAE Technical Paper TP-AAB-AABC_2009_P_18, 2009, .