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Systems, Methods and Computer Readable Media for Modeling Cell Performance Fade, Kinetic Performance, Capacity Loss, of Rechargeable Electrochemical Devices

Idaho National Laboratory

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Publications:

PDF Document PublicationCellSage Fact Sheet (3,409 KB)

CellSage battery metrics essential to comprehensive understanding of aging processes that impact performance
CellSage battery metrics essential to comprehensive understanding of aging processes that impact performance

Technology Marketing Summary

 INL has developed a set of methods to define measure, evaluate, track and predict performance and aging trends for advanced chemistry batteries, including lithium-ion batteries.  

Description

INL’s novel CellSage modeling approach generates principal performance metrics such as kinetic performance, capacity loss, conductance fade, power loss, and ancillary quantities.  The kinetics model yields highly accurate predictions of voltage drop and impedance contributions for a given electrochemical device at arbitrary conditions of temperature, current, pulse time, and device aging. Performance over battery life is treated by a self-consistent framework that employs physics-based models to accomplish diagnosis of aging mechanisms.  For example, the model enables forecasting of capacity loss and contributing terms, allowing evaluation of remaining useful life as based on a minimum performance criterion.  Hence, CellSage will facilitate improvement of battery technology by isolating foremost failure sources, and can serve as a platform to place improved imbedded diagnostics and dynamic monitoring within the intended application.

Benefits
Applying CellSage to targeted battery chemistries yields a deeper understanding of battery longevity, enabling a reduction in costly battery warranty claims, compression of development timelines, and mapping of battery use conditions to optimize life.  CellSage also supports battery system development by characterizing cell and string performance in a virtually unlimited matrix of arbitrary environmental and operating conditions. The results are improved development cycle times and superior time-to-market, along with higher confidence in
meeting battery performance commitments.
Applications and Industries
CellSage and its capabilities will be of interest to any organization involved in battery development or design of electronic devices where battery performance is critical.  Applicable industries include military, space, medicine, electric utilities, telecommunications, some consumer electronics, and electric vehicles.
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 8,467,984
Patent
8,467,984
Systems, methods and computer readable media for estimating capacity loss in rechargeable electrochemical cells
A system includes an electrochemical cell, monitoring hardware, and a computing system. The monitoring hardware periodically samples charge characteristics of the electrochemical cell. The computing system periodically determines cell information from the charge characteristics of the electrochemical cell. The computing system also periodically adds a first degradation characteristic from the cell information to a first sigmoid expression, periodically adds a second degradation characteristic from the cell information to a second sigmoid expression and combines the first sigmoid expression and the second sigmoid expression to develop or augment a multiple sigmoid model (MSM) of the electrochemical cell. The MSM may be used to estimate a capacity loss of the electrochemical cell at a desired point in time and analyze other characteristics of the electrochemical cell. The first and second degradation characteristics may be loss of active host sites and loss of free lithium for Li-ion cells.
Idaho National Laboratory 06/18/2013
Issued
Patent 8,521,497
Patent
8,521,497
Systems, methods and computer-readable media for modeling cell performance fade of rechargeable electrochemical devices
A system includes an electrochemical cell, monitoring hardware, and a computing system. The monitoring hardware periodically samples performance characteristics of the electrochemical cell. The computing system determines cell information from the performance characteristics of the electrochemical cell. The computing system also develops a mechanistic level model of the electrochemical cell to determine performance fade characteristics of the electrochemical cell and analyzing the mechanistic level model to estimate performance fade characteristics over aging of a similar electrochemical cell. The mechanistic level model uses first constant-current pulses applied to the electrochemical cell at a first aging period and at three or more current values bracketing a first exchange current density. The mechanistic level model also is based on second constant-current pulses applied to the electrochemical cell at a second aging period and at three or more current values bracketing the second exchange current density.
Idaho National Laboratory 08/27/2013
Issued
Patent 8,346,495
Patent
8,346,495
Systems, methods and computer-readable media to model kinetic performance of rechargeable electrochemical devices
A system includes an electrochemical cell, monitoring hardware, and a computing system. The monitoring hardware samples performance characteristics of the electrochemical cell. The computing system determines cell information from the performance characteristics. The computing system also analyzes the cell information of the electrochemical cell with a Butler-Volmer (BV) expression modified to determine exchange current density of the electrochemical cell by including kinetic performance information related to pulse-time dependence, electrode surface availability, or a combination thereof. A set of sigmoid-based expressions may be included with the modified-BV expression to determine kinetic performance as a function of pulse time. The determined exchange current density may be used with the modified-BV expression, with or without the sigmoid expressions, to analyze other characteristics of the electrochemical cell. Model parameters can be defined in terms of cell aging, making the overall kinetics model amenable to predictive estimates of cell kinetic performance along the aging timeline.
Idaho National Laboratory 01/01/2013
Issued
Application 20130090900
Application
20130090900
METHOD, SYSTEM, AND COMPUTER-READABLE MEDIUM FOR DETERMINING PERFORMANCE CHARACTERISTICS OF AN OBJECT UNDERGOING ONE OR MORE ARBITRARY AGING CONDITIONS
A method, system, and computer-readable medium are described for characterizing performance loss of an object undergoing an arbitrary aging condition. The method comprises collecting baseline aging data from the object for at least one known baseline aging condition over time, determining baseline multiple sigmoid model parameters from the baseline data, and determining performance loss data of the object over time through multiple sigmoid model parameters associated with the object undergoing the arbitrary aging condition using a differential deviation-from-baseline approach from the baseline multiple sigmoid model parameters. The system comprises an object, monitoring hardware configured to sample performance characteristics of the object, and a processor coupled to the monitoring hardware. The processor is configured to determine performance loss data for the arbitrary aging condition from a comparison of the performance characteristics of the object deviating from baseline performance characteristics associated with a baseline aging condition.
Idaho National Laboratory 08/29/2012
Filed
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BA-435, BA-436, BA-437, BA-676, CW (Copyright)-10-10, CW-10-11PrototypeAvailable04/14/201104/16/2014

Contact INL About This Technology

To: Ryan Bills<Ryan.Bills@inl.gov>