Systems, methods and computer readable media for estimating capacity loss in rechargeable electrochemical cells
First Claim
1. A method of analyzing capacity loss of an electrochemical cell, comprising:
- modeling a loss of active host sites of the electrochemical cell with a first sigmoid expression;
modeling a loss of free lithium of the electrochemical cell 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;
wherein a processor performs at least one of the acts of the method of analyzing capacity loss of the electrochemical cell.
3 Assignments
0 Petitions
Accused Products
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.
-
Citations
24 Claims
-
1. A method of analyzing capacity loss of an electrochemical cell, comprising:
-
modeling a loss of active host sites of the electrochemical cell with a first sigmoid expression; modeling a loss of free lithium of the electrochemical cell 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; wherein a processor performs at least one of the acts of the method of analyzing capacity loss of the electrochemical cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A model development method, comprising:
-
periodically sampling cell characteristics of an electrochemical cell; determining a loss of active host sites and a loss of free lithium from the cell characteristics; periodically adding the loss of active host sites to a first sigmoid expression; periodically adding the loss of free lithium 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; wherein a processor performs at least one of the acts of the model development method. - View Dependent Claims (14, 15, 16, 17)
-
-
18. A method of adapting to analysis of capacity loss of an electrochemical cell, comprising:
-
modeling a loss of active host sites of the electrochemical cell with a first sigmoid expression; modeling a loss of free lithium of the electrochemical cell 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; wherein a processor performs at least one of the acts of the method of adapting to analysis of capacity loss of the electrochemical cell. - View Dependent Claims (19)
-
-
20. A system, comprising:
-
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 loss of active host sites from the electrochemical cell information to a first sigmoid expression; adding a loss of free lithium 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 (21, 22)
-
-
23. A non-transitory computer-readable medium including computer-executable instructions, which when executed on one or more processors, perform the acts comprising:
-
periodically sampling cell characteristics of an electrochemical cell; determining a loss of active host sites and a loss of free lithium from the cell characteristics; periodically adding the loss of active host sites to a first sigmoid expression; periodically adding the loss of free lithium 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 (24)
-
Specification