Imbedded chip for battery applications
First Claim
1. A device for monitoring a condition of an electrochemical cell, the device comprising an integrated circuit comprising:
- a voltage monitoring circuit for measuring a plurality of open circuit voltages of said electrochemical cell, said plurality of open circuit voltages generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell;
a temperature monitoring circuit for measuring a plurality of temperatures of said electrochemical cell, said plurality of temperatures generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell;
a current monitoring circuit for measuring a charging current of said electrochemical cell or a discharging current of said electrochemical cell; and
a circuit for determining a thermodynamic parameter of said electrochemical cell, wherein said thermodynamic parameter is one or more of a change in entropy of said electrochemical cell, a change in enthalpy of said electrochemical cell and a change in free energy of said electrochemical cell, said circuit for determining a thermodynamic parameter positioned in electrical or data communication with said temperature monitoring circuit to receive temperature measurements from said temperature monitoring circuit, positioned in electrical or data communication with said voltage monitoring circuit to receive open circuit voltage measurements from said voltage monitoring circuit and positioned in electrical or data communication with said current monitoring circuit to receive current measurements from said current monitoring circuit or to provide thermodynamics parameters to said current monitoring circuit;
wherein said device does not comprise a temperature controller or a means for controlling or establishing said plurality of temperatures generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell.
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Accused Products
Abstract
Provided are methods, systems and devices for thermodynamically evaluating electrochemical systems and components thereof, including electrochemical cells such as batteries. The present systems and methods are capable of monitoring selected electrochemical cell conditions, such as temperature, open circuit voltage and/or composition, and carrying out measurements of a number of cell parameters, including open circuit voltage, time and temperature, with accuracies large enough to allow for precise determination of thermodynamic state functions and materials properties relating to the composition, phase, states of charge, health and safety and electrochemical properties of electrodes and electrolytes in an electrochemical cell. Thermodynamic measurement systems of the present invention are highly versatile and provide information for predicting a wide range of performance attributes for virtually any electrochemical system having an electrode pair.
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Citations
29 Claims
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1. A device for monitoring a condition of an electrochemical cell, the device comprising an integrated circuit comprising:
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a voltage monitoring circuit for measuring a plurality of open circuit voltages of said electrochemical cell, said plurality of open circuit voltages generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell; a temperature monitoring circuit for measuring a plurality of temperatures of said electrochemical cell, said plurality of temperatures generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell; a current monitoring circuit for measuring a charging current of said electrochemical cell or a discharging current of said electrochemical cell; and a circuit for determining a thermodynamic parameter of said electrochemical cell, wherein said thermodynamic parameter is one or more of a change in entropy of said electrochemical cell, a change in enthalpy of said electrochemical cell and a change in free energy of said electrochemical cell, said circuit for determining a thermodynamic parameter positioned in electrical or data communication with said temperature monitoring circuit to receive temperature measurements from said temperature monitoring circuit, positioned in electrical or data communication with said voltage monitoring circuit to receive open circuit voltage measurements from said voltage monitoring circuit and positioned in electrical or data communication with said current monitoring circuit to receive current measurements from said current monitoring circuit or to provide thermodynamics parameters to said current monitoring circuit; wherein said device does not comprise a temperature controller or a means for controlling or establishing said plurality of temperatures generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of determining a condition of an electrochemical cell, the method comprising the steps of:
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providing a device comprising an integrated circuit comprising; a voltage monitoring circuit for measuring a plurality of open circuit voltages of said electrochemical cell, said plurality of open circuit voltages generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell; a temperature monitoring circuit for measuring a plurality of temperatures of said electrochemical cell, said plurality of temperatures generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell; a current monitoring circuit for measuring a charging current of said electrochemical cell or a discharging current of said electrochemical cell; and a circuit for determining a thermodynamic parameter of said electrochemical cell, wherein said thermodynamic parameter is one or more of a change in entropy of said electrochemical cell, a change in enthalpy of said electrochemical cell and a change in free energy of said electrochemical cell, said circuit for determining a thermodynamic parameter positioned in electrical or data communication with said temperature monitoring circuit to receive temperature measurements from said temperature monitoring circuit, positioned in electrical or data communication with said voltage monitoring circuit to receive open circuit voltage measurements from said voltage monitoring circuit and positioned in electrical or data communication with said current monitoring circuit to receive current measurements from said current monitoring circuit or to provide thermodynamics parameters to said current monitoring circuit; wherein said device does not comprise a temperature controller or a means for controlling or establishing said plurality of temperatures generated upon charging or discharging said electrochemical cell or stopping charging or discharging said electrochemical cell of said electrochemical cell; generating said plurality of open circuit voltages of said electrochemical cell, said plurality of temperatures of said electrochemical cell or both said plurality of open circuit voltages of said electrochemical cell and said plurality of temperatures of said electrochemical cell; and determining a first thermodynamic parameter of said electrochemical cell using said integrated circuit. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification