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Title: 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.
Inventors:
Issue Date:
OSTI Identifier:
1084075
Assignee:
Battelle Energy Alliance, LLC (Idaho Falls, ID) IDO
Patent Number(s):
8,467,984
Application Number:
12/571,253
Contract Number:
AC07-05ID14517
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 97 MATHEMATICS AND COMPUTING