End of life indication system and method for non-aqueous cell having amorphous or semi-crystalline copper manganese oxide cathode material
View Patent ↗The present disclosure relates generally to indicating an end of life condition of an electrochemical device, and more particularly to systems and methods for sensing and determining an end of life condition in a cell comprising a high capacity cathode material suitable for use in a non-aqueous electrochemical cell. The high capacity cathode material has an amorphous or semi-crystalline form of copper manganese oxide, and optionally fluorinated carbon. The present disclosure additionally relates to transmitting the determined end of life condition to a user or monitoring device of the cell.
1. A system for selectively providing an indication of an end of life condition comprising:
an electrochemical device comprising a positive terminal, a negative terminal, and a cell comprising a cathode, the cathode comprising an amorphous or semi-crystalline copper manganese oxide cathode material;
a sense component comprising a voltage sensor for sensing a voltage of the electrochemical device, said sense component having a positive input, a negative input, and an output, wherein the positive input is connected to the positive terminal of the electrochemical device and the negative input is connected to the negative terminal of the electrochemical device; and
a controller connected to the output of the sense component, the controller receiving a signal from the sense component indicative of the voltage of the electrochemical device, determining whether to provide an indication of an end of life condition as a function of the received signal, and selectively providing an indication of the end of life condition as a function of said determining,
wherein an average molar ratio of copper to manganese in the copper manganese oxide cathode material is from about about 3:1 to 6:1.
2. The system of claim 1 , wherein:
the electrochemical device is one of a battery and a capacitor, the electrochemical device comprising a plurality of electrochemical cells substantially identical to the cell, and
the controller selectively provides the indication of the end of life condition by alerting a user to that the end of life condition has been determined.
3. The system of claim 1 , wherein:
the cathode comprises copper manganese oxide in combination with fluorinated carbon,
the combination of copper manganese oxide and fluorinated carbon has a greater discharge voltage at higher specific discharge capacities than fluorinated carbon, and
the cathode further comprises a binder material and a conductive additive.
4. The system of claim 1 , wherein:
the cell further comprises:
an anode comprising a metal selected from the group consisting of Group 1A and Group 2A of the Periodic Table of the Elements;
a separator disposed between the anode and the cathode comprising a polymer membrane; and
a non-aqueous, ionically conductive electrolyte, wherein said electrolyte comprises an ionizable alkali metal salt dissolved in an aprotic organic solvent or a mixture of solvents comprising a relatively low viscosity solvent and a relatively high permittivity solvent, and
said electrolyte is in fluid communication with the anode, the cathode, and the separator.
5. The system of claim 1 , wherein:
the electrochemical device has a first plateau at a first discharge voltage and a second plateau at a second discharge voltage less than the first discharge voltage, and
the controller determines that a first indication of the end of life condition should be provided when the received signal is indicative of the voltage of the electrochemical device having decreased below a first threshold voltage, and
the first threshold voltage is between the first discharge voltage and the second discharge voltage.
6. The system of claim 1 , wherein:
the electrochemical device has a first plateau at a first discharge voltage and a second plateau at a second discharge voltage less than the first discharge voltage, and
the controller determines that a second indication of the end of life condition should be provided when the received signal is indicative of the voltage of the electrochemical device having decreased below a second threshold voltage, and
the second threshold voltage is less than the second discharge voltage.
7. The system of claim 1 , wherein:
the sense component further comprises a temperature sensor for measuring the temperature of the electrochemical device, and
the controller determines whether to provide the indication of the end of life condition as a function of the temperature of the electrochemical device.
8. The system of claim 1 , wherein:
the sense component further comprises a current monitor for measuring a current provided by the electrochemical device, and
the controller determines whether to provide the indication of the end of life condition as a function of the current provided by the electrochemical device.
9. The system of claim 1 , wherein:
the controller is operable in a reduced energy use state;
the controller further comprises a sleep timer for waking the controller from the reduced energy use state at a predetermined time; and
the controller determines, in response to said waking, whether to provide the indication of the end of life condition.
10. The system of claim 1 , wherein:
the controller is operable in a reduced energy use state;
the controller is responsive to a command from an external interrupter for waking from the reduced energy use state and determining whether to provide the end of life indication; and
the external interrupter is other than in direct physical contact with the system.
11. The system of claim 1 , wherein the controller further comprises a transmit component for providing the indication of the end of life condition by transmitting a signal indicative of the end of life condition to a receiver.
12. An electronic device comprising:
a load having a positive terminal and a negative terminal;
an electrochemical device comprising a positive terminal, a negative terminal, and a cell comprising a cathode, the cathode comprising an amorphous or semi-crystalline copper manganese oxide cathode material, wherein the positive terminal of the electrochemical device is connected to the positive terminal of the load, the negative terminal of the electrochemical device is connected to the negative terminal of the load, and the electrochemical device provides electrical power to the load; and
an end of life sensor comprising:
a sense component comprising a voltage sensor for sensing a voltage of the electrochemical device, said sense component having a positive input, a negative input, and an output, wherein the positive input is connected to the positive terminal of the electrochemical device and the negative input is connected to the negative terminal of the electrochemical device; and
a controller connected to the output of the sense component, the controller receiving a signal from the sense component indicative of the voltage of the electrochemical device, determining whether to provide an indication of an end of life condition as a function of the received signal, and selectively providing an indication of the end of life condition as a function of said determining,
wherein an average molar ratio of copper to manganese in the copper manganese oxide cathode material is from about about 3:1 to 6:1.
13. The electronic device of claim 12 , wherein the cathode comprises copper manganese oxide in combination with fluorinated carbon,
the combination of copper manganese oxide and fluorinated carbon has a greater discharge voltage at higher specific discharge capacities than fluorinated carbon, and
the cathode further comprises a binder material and a conductive additive.
14. The electronic device of claim 12 , wherein the cell further comprises:
an anode comprising a metal selected from the group consisting of Group 1A and Group 2A of the Periodic Table of the Elements;
a separator material disposed between the anode and the cathode, the separator material comprising a polymer membrane; and
a non-aqueous, ionically conductive electrolyte, wherein said electrolyte comprises an ionizable alkali metal salt dissolved in an aprotic organic solvent or a mixture of solvents comprising a relatively low viscosity solvent and a relatively high permittivity solvent, said electrolyte being in fluid communication with the anode, the cathode, and the separator.
15. The electronic device of claim 12 , wherein:
the electrochemical device has a first plateau at a first discharge voltage and a second plateau at a second discharge voltage less than the first discharge voltage,
the controller determines that a first indication of the end of life condition should be provided when the received signal is indicative of the voltage of the electrochemical device having decreased below a first threshold voltage, and
the first threshold voltage is between the first discharge voltage and the second discharge voltage.
16. The electronic device of claim 12 , wherein:
the electrochemical device has a first plateau at a first discharge voltage and a second plateau at a second discharge voltage less than the first discharge voltage,
the controller determines that a second indication of the end of life condition should be provided when the received signal is indicative of the voltage of the electrochemical device having decreased below a second threshold voltage, and
the second threshold voltage is less than the second discharge voltage.
17. A method of selectively providing an indication of an end of life condition in a cell having a cathode comprising an amorphous or semi-crystalline copper manganese oxide cathode material, said method comprising:
connecting an electrochemical device comprising the cell to an end of life sensor, wherein the electrochemical device further comprises a positive terminal and a negative terminal, the end of life sensor comprises a positive input and a negative input, and wherein the positive terminal of the electrochemical device is connected to the positive input of the end of life sensor, and the negative terminal of the electrochemical device is connected to the negative input of the end of life sensor;
sensing a discharge voltage of the electrochemical device via a sense component of the end of life sensor, said sense component comprising a voltage sensor for sensing the discharge voltage of the electrochemical device and providing a signal indicative of the sensed discharge voltage to a controller of the end of life sensor via an output of the sense component;
determining whether to provide an indication of an end of life condition, said determining being at least in part a function of the signal provided by the voltage sensor to the controller; and
selectively providing an indication of the end of life condition as a function of said determining,
wherein an average molar ratio of copper to manganese in the copper manganese oxide cathode material is from about 3:1 to 6:1.
18. The method of claim 17 , wherein:
the electrochemical device has a first plateau at a first discharge voltage and a second plateau at a second discharge voltage less than the first discharge voltage,
the controller determines that a first indication of the end of life condition should be provided when the provided signal is indicative of the voltage of the electrochemical device having decreased below a first threshold voltage, and
the first threshold voltage is between the first discharge voltage and the second discharge voltage.
19. The method of claim 17 , wherein:
the electrochemical device has a first plateau at a first discharge voltage and a second plateau at a second discharge voltage less than the first discharge voltage,
the controller determines that a second indication of the end of life condition should be provided when the provided signal is indicative of the voltage of the electrochemical device having decreased below a second threshold voltage, and
the second threshold voltage is less than the second discharge voltage.
20. The method of claim 17 , further comprising:
operating the end of life sensor in a reduced energy use state; and
waking the end of life sensor at a predetermined time,
wherein in response to said waking, the controller determines whether to provide the indication of the end of life condition.
21. The method of claim 17 , further comprising:
operating the end of life sensor in a reduced energy use state; and
waking the end of life sensor in response to a command from an external interrupter,
wherein:
said external interrupter is not in direct physical contact with the end of life sensor at a predetermined time; and
in response to said waking, the controller determines whether to provide the indication of the end of life condition.
22. The method of claim 17 , wherein providing the indication of the end of life condition comprises transmitting a signal to a receiver via a transmitter of the end of life sensor.