Composite battery and methods of forming same
First Claim
1. A composite electrical battery, comprising:
- a primary electrochemical cell; and
a fully or partially discharged rechargeable electrochemical cell electrically connected in parallel to said primary electrochemical cell,wherein the open circuit voltage of said primary electrochemical cell is lower than the open circuit voltage of said rechargeable cell when said rechargeable cell is not connected to said primary cell and is fully charged, and wherein the self discharge rate of said rechargeable electrochemical cell after electrically connecting said rechargeable electrochemical cell to said primary electrochemical cell is less than the self discharge rate of said rechargeable electrochemical cell when said rechargeable electrochemical cell is not connected to said primary cell and is fully charged.
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Abstract
A composite electrical battery including a primary electrochemical cell and a fully or partially discharged rechargeable electrochemical cell. The rechargeable electrochemical cell is electrically connected in parallel to the primary electrochemical cell. The open circuit voltage of the primary electrochemical cell is significantly lower than the open circuit voltage of the rechargeable cell when the rechargeable cell is fully charged. The self discharge rate of the rechargeable electrochemical cell after electrically connecting the rechargeable electrochemical cell to the primary electrochemical cell is less than a predetermined self discharge rate. The composite battery has an improved current delivery capability for an extended life span compared to the primary electrochemical cell by itself. A method is provided for forming such a composite electrical battery. The method includes providing a primary electrochemical cell, providing a fully or partially discharged rechargeable electrochemical cell, and electrically connecting the primary electrochemical cell in parallel with the fully or partially discharged rechargeable electrochemical cell to form the composite electrical battery. The self discharge rate of the rechargeable electrochemical cell after electrically connecting to the primary electrochemical cell is less than a predetermined self discharge rate for extending the useful lifespan of the composite battery.
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Citations
24 Claims
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1. A composite electrical battery, comprising:
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a primary electrochemical cell; and a fully or partially discharged rechargeable electrochemical cell electrically connected in parallel to said primary electrochemical cell, wherein the open circuit voltage of said primary electrochemical cell is lower than the open circuit voltage of said rechargeable cell when said rechargeable cell is not connected to said primary cell and is fully charged, and wherein the self discharge rate of said rechargeable electrochemical cell after electrically connecting said rechargeable electrochemical cell to said primary electrochemical cell is less than the self discharge rate of said rechargeable electrochemical cell when said rechargeable electrochemical cell is not connected to said primary cell and is fully charged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for forming a composite electrical battery, the method comprising the steps of:
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providing a primary electrochemical cell; providing a fully or partially discharged rechargeable electrochemical cell; and electrically connecting said primary electrochemical cell in parallel with said fully or partially discharged rechargeable electrochemical cell to form said composite electrical battery, wherein the open circuit voltage of said primary electrochemical cell is lower than the open circuit voltage of said rechargeable cell when said rechargeable cell is not connected to said primary cell and is fully charged, and wherein the self discharge rate of said rechargeable electrochemical cell after the step of electrically connecting is less than the self discharge rate of said rechargeable electrochemical cell when said rechargeable electrochemical cell is not connected to said primary cell and is fully charged. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification