Process and apparatus for nickel-cadmium battery revival
First Claim
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1. A process to revive nickel-cadmium batteries or cells comprising:
- providing a battery or cell suffering from unrechargeability and low, zero, or negative terminal voltage;
the injection of a short-duration high-magnitude constant-amplitude current pulse through the battery or cell from the positive to the negative terminal;
and thereby raising the terminal voltage and allowing the battery or cell to be rechargeable and usable again.
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Abstract
The invention resides in a process and an apparatus for the revival of nickel-cadmium batteries and cells suffering from low, zero, or negative terminal voltage and unrechargeability. The process revives the cells or batteries by the injection of a short-duration high-magnitude current pulse through them. The apparatus to carry out the process is built around a current source that is operated either manually or by a timer for the required duration.
15 Citations
9 Claims
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1. A process to revive nickel-cadmium batteries or cells comprising:
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providing a battery or cell suffering from unrechargeability and low, zero, or negative terminal voltage; the injection of a short-duration high-magnitude constant-amplitude current pulse through the battery or cell from the positive to the negative terminal; and thereby raising the terminal voltage and allowing the battery or cell to be rechargeable and usable again. - View Dependent Claims (2)
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3. An apparatus to carry out the revival process, for any battery that needs revival regardless of its original nominal voltage, comprising:
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a source of DC power, or an unregulated power supply of sufficient voltage; a constant-current regulator producing a constant current at its output when powered by a DC voltage at its input; an electrically-controlled switch connected at its input to said DC power source, and connected at its output to said constant-current regulator, and having a control terminal to receive a control signal to put it in a conductive state in order to permit current flow from the DC power source to the constant-current regulator for the duration of the control signal; means for connecting the positive terminal of the battery to be revived to the output of said constant-current regulator, and means for connecting the negative terminal to ground; a timer to produce a control signal of a specific duration in response to an input trigger signal, the output of said timer is connected to the control terminal of said electrically-controlled switch; and a push-button to activate said timer by the application of a trigger signal to the trigger input of said timer. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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Specification