SYSTEMS, METHODS AND COMPUTER READABLE MEDIA FOR ESTIMATING CAPACITY LOSS IN RECHARGEABLE ELECTROCHEMICAL CELL
First Claim
1. A method wherein at least one act of the method is performed by a processor, the method comprising:
- analyzing a first degradation characteristic of an electrochemical cell modeled with a first sigmoid expression;
analyzing a second degradation characteristic of the electrochemical cell modeled with a second sigmoid expression;
combining the first sigmoid expression and the second sigmoid expression to develop a multiple sigmoid model; and
estimating a capacity loss of the electrochemical cell at a desired point in time using the multiple sigmoid model.
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Abstract
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.
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Citations
32 Claims
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1. A method wherein at least one act of the method is performed by a processor, the method comprising:
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analyzing a first degradation characteristic of an electrochemical cell modeled with a first sigmoid expression; analyzing a second degradation characteristic of the electrochemical cell modeled with a second sigmoid expression; combining the first sigmoid expression and the second sigmoid expression to develop a multiple sigmoid model; and estimating a capacity loss of the electrochemical cell at a desired point in time using the multiple sigmoid model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A model development method wherein at least one act of the method is performed by a processor, the method, comprising:
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periodically sampling cell characteristics of an electrochemical cell; determining a first degradation characteristic and a second degradation characteristic from the cell characteristics; periodically adding the first degradation characteristic to a first sigmoid expression; periodically adding the second degradation characteristic to a second sigmoid expression; and combining the first sigmoid expression and the second sigmoid expression to develop or augment a multiple sigmoid model of the electrochemical cell. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method, comprising:
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analyzing a first degradation characteristic of an electrochemical cell modeled with a first sigmoid expression; analyzing a second degradation characteristic of the electrochemical cell modeled with a second sigmoid expression; combining the first sigmoid expression and the second sigmoid expression to develop a multiple sigmoid model; estimating a capacity loss of the electrochemical cell at a desired point in time using the multiple sigmoid model; and modifying at least one of a discharge process for, a charge process for, and composition of, the electrochemical cell responsive to the estimating the capacity loss. - View Dependent Claims (23)
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24. A system, comprising:
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at least one electrochemical cell; monitoring hardware operably coupled to the at least one electrochemical cell and configured for periodically sampling cell characteristics of the at least one electrochemical cell; a computing system operably coupled to the monitoring hardware and configured for periodically; determining electrochemical cell information from to the cell characteristics of the electrochemical cell; adding a first degradation characteristic from the electrochemical cell information to a first sigmoid expression; adding a second degradation characteristic from the electrochemical cell information to a second sigmoid expression; and combining the first sigmoid expression and the second sigmoid expression to develop or augment a multiple sigmoid model of the at least one electrochemical cell. - View Dependent Claims (25, 26, 27, 28)
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29. A computer-readable medium including computer-executable instructions, which when executed on one or more processors, perform the acts comprising:
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periodically sampling cell characteristics of an electrochemical cell; determining a first degradation characteristic and a second degradation characteristic from the cell characteristics; periodically adding the first degradation characteristic to a first sigmoid expression; periodically adding the second degradation characteristic to a second sigmoid expression; and combining the first sigmoid expression and the second sigmoid expression to develop or augment a multiple sigmoid model of the electrochemical cell. - View Dependent Claims (30, 31, 32)
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Specification