Available Technology

A Two-Dimensional Thermal-Electrochemical Model for Prismatic Lithium Ion Cells

Existing battery management algorithms rely upon empirical correlations between the cell voltage and the load profile. This approach limits the predictive ability of the battery management system to forecast remaining useful life of a battery in a vehicle, or the range available at any given instant when the vehicle is in operation.
Abstract: 
Existing battery management algorithms rely upon empirical correlations between the cell voltage and the load profile. This approach limits the predictive ability of the battery management system to forecast remaining useful life of a battery in a vehicle, or the range available at any given instant when the vehicle is in operation.
Benefits: 
This software is specifically light-weighted for hardware-in-the-loop simulations and implements the thermal and electrochemical laws of conservation in a format that can be readily implemented onto hardware for interfacing with and controlling lithium ion cells. The model can: -Provide real-time updates of electrochemical states when interfaced with a battery -Accept a set value for current (or voltage), the initial states within the positive and negative electrodes, and the initial cell and ambient temperatures as input, and predict the voltage (or current) under these conditions after a specified duration -Determine whether or not a lithium ion cell can deliver the power requirement for a given set of initial conditions for the cell -Output the distribution in temperature, current and potential across the electrodes for a given load profile The software has been used to demonstrate 50% reduction to charge times of lithium ion cells and about 10% reduction to the size of a PHEV battery pack.
applications: 
Internal Laboratory Ref #: 
NREL SWR 14-04 -Development -Available -12/11/2015 -12/11/2015
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