Battery State of Health Assessment System
First Claim
1. A method of characterizing the state of health of an electrochemical cell comprising a host material, the method comprising the steps of:
- determining Δ
G, Δ
S and/or Δ
H of the electrochemical cell for a plurality of selected electrochemical cell compositions;
determining states of charge of the electrochemical cell for each of the plurality of selected electrochemical cell compositions;
identifying the states of charge and Δ
G, Δ
S and/or Δ
H corresponding to an event or condition of the electrochemical cell; and
comparing the Δ
G, Δ
S and/or Δ
H corresponding to the event or condition of the electrochemical cell to reference Δ
G, Δ
S and/or Δ
H corresponding to the event or condition of a reference electrochemical cell.
2 Assignments
0 Petitions
Accused Products
Abstract
Described herein are systems and methods for accurately characterizing thermodynamic and materials properties of electrodes and electrochemical energy storage and conversion systems. Enhanced sensitivity provided by the present methods and systems combined with measurement conditions that reflect thermodynamically stabilized electrode conditions allow very accurate measurement of thermodynamic parameters, including state functions such as the Gibbs free energy, enthalpy and entropy of electrode/electrochemical cell reactions, that enable prediction of important performance attributes of electrode materials and electrochemical systems, such as the energy, power density, current rate, the cycle life and the state of health of an electrochemical cell. Also provided are systems and methods for charging electrochemical cells; for example, systems and methods for charging an electrochemical according to its state of health.
98 Citations
32 Claims
-
1. A method of characterizing the state of health of an electrochemical cell comprising a host material, the method comprising the steps of:
-
determining Δ
G, Δ
S and/or Δ
H of the electrochemical cell for a plurality of selected electrochemical cell compositions;determining states of charge of the electrochemical cell for each of the plurality of selected electrochemical cell compositions; identifying the states of charge and Δ
G, Δ
S and/or Δ
H corresponding to an event or condition of the electrochemical cell; andcomparing the Δ
G, Δ
S and/or Δ
H corresponding to the event or condition of the electrochemical cell to reference Δ
G, Δ
S and/or Δ
H corresponding to the event or condition of a reference electrochemical cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21)
-
-
11. A method of charging an electrochemical cell comprising a host material, the method comprising the steps of:
-
characterizing the state of health of the electrochemical cell; selecting a charging voltage and/or current according to the characterized state of health of the electrochemical cell; and providing the selected voltage and/or current to electrodes of the electrochemical cell to charge the electrochemical cell. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A system for charging an electrochemical cell comprising a host material, the system comprising:
-
means for delivering a voltage and/or current to electrodes of the electrochemical cell; means for characterizing a state of health of the electrochemical cell; and a control circuit for; receiving the characterized state of health; and controlling the means for delivering a voltage and/or current. - View Dependent Claims (19, 20, 22, 23, 24, 25, 26, 27)
-
-
28. The system of claim 18, configured for performing a method comprising the steps of:
-
characterizing the state of health of the electrochemical cell; selecting a charging voltage and/or current according to the characterized state of health of the electrochemical cell; and providing the selected voltage and/or current to electrodes of the electrochemical cell to charge the electrochemical cell. - View Dependent Claims (29, 30, 31, 32)
-
-
28-1. A method of charging an electrochemical cell in a mobile electronic device, the method comprising the steps of:
-
monitoring a voltage profile of the electrochemical cell over at least one discharge cycle; determining a charging voltage and/or current based upon the monitored discharge voltage profile; and providing the charging voltage and/or current to electrodes of the electrochemical cell, thereby charging the electrochemical cell.
-
Specification