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US 7,068,036 B1Granted
Lithium/carbon monofluoride (Li/CFx) electrochemical cell projection model
AssigneeWiWilson Greatbatch Technologies, Inc.
InventorsKenneth C. Syracuse, Esther S. Takeuchi
Life of this patent
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Abstract
A model for estimating the discharge profile of a Li/CFx cell is described. The model uses as inputs the load at which the cell is subjected to and the planar surface area to estimate current density. Then, current density is used to estimate cell voltage at each 2% depth-of-discharge.
Claims20
A method for estimating the voltage profile for an electrochemical cell, comprising the steps of:
- a) providing electrochemical cell having an anode comprising lithium and a cathode comprising CFx as a cathode active material activated with a nonaqueous electrolyte;
- b) determining a planar interface area for the cell;
- c) discharging the cell under a known load;
- d) estimating a current density from a relationship between the known load and the planar interface area at a specified depth-of-discharge (DoD) using a first equation of:
- current density=exp(a+b(ln(load))+c(PIA));
- e) calculating a relationship between the current density and a voltage using a second equation of:
- voltage=d+e(current_density)3+f(ln(current_density)2);
- and
- f) combining the current density and the voltage to predict a voltage capacity at the specified depth-of-discharge.
6 more elements
A method for estimating the voltage profile for an electrochemical cell, comprising the steps of:
- a) providing electrochemical cell having an anode comprising lithium and a cathode comprising CFx as a cathode active material activated with a nonaqueous electrolyte;
- b) determining a planar interface area for the cell;
- c) discharging the cell under a known load;
- d) estimating a current density from a relationship between the known load and the planar interface area at a specified depth-of-discharge (DoD) using a first equation of:
- current density=exp(a+b(ln(load))+c(PIA));
- e) calculating a relationship between the current density a and voltage using a second equation of:
- voltage=d+e(current_density)3+f(ln(current_density)2);
- f) combining the current density and the voltage to predict a voltage capacity at the specified depth-of-discharge;
- and
- g) repeating steps b to f for a second DoD with the planar interface area having changed to thereby predict a second voltage capacity at the second DoD.
7 more elements
Dependencies are inferred from the claim text.