Method and apparatus for regulating charging of electrochemical cells using cell temperature increase rate
First Claim
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1. A charger of the type that delivers a charge to an electrochemical cell, the charger comprising:
- a controller;
at least one battery compartment that receives the electrochemical cell, the battery compartment including;
a positive charge contact engaging a positive cell terminal of the electrochemical cell;
a negative charge contact engaging a negative cell terminal of the electrochemical cell; and
a thermistor engaging the negative cell terminal at a position remote from the negative charge contact, wherein the thermistor provides data output to the controller for determining a temperature rate increase of the cell.
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Abstract
A rechargeable electrochemical cell charging system is provided having a thermistor that engages the negative cell terminal at a location remote from the negative charge contact. The thermistor outputs temperature data to a controller in the charger that determines the rate of cell temperature increase. When the increase reaches a predetermined predetermined rate, the charge to the cell is discontinued. The cell can also include an air moving system that circulates cool ambient air through battery compartment to cool the batteries being charged.
9 Citations
30 Claims
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1. A charger of the type that delivers a charge to an electrochemical cell, the charger comprising:
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a controller; at least one battery compartment that receives the electrochemical cell, the battery compartment including; a positive charge contact engaging a positive cell terminal of the electrochemical cell; a negative charge contact engaging a negative cell terminal of the electrochemical cell; and a thermistor engaging the negative cell terminal at a position remote from the negative charge contact, wherein the thermistor provides data output to the controller for determining a temperature rate increase of the cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A charger of the type that delivers a charge to an electrochemical cell, the charger comprising:
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a housing; at least one battery compartment disposed in the housing that receives the electrochemical cell wherein the battery compartment includes a positive charge contact and a negative charge contact; a controller; a thermistor located within the battery compartment at a position remote from the negative charge contact; and an air moving system including a vent disposed proximal the electrochemical cell, and a forced air source that draws ambient air into the vent. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for determining a charge termination point, the method comprising:
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connecting a positive positive cell terminal and a negative cell terminal of an electrochemical cell to a positive charge contact and a negative charge contact, respectively, of a battery charger; applying a charge to the cell via the positive charge contact and the neciative charge contact; measuring a cell temperature at the negative cell terminal of the cell using a thermistor engaging the negative cell terminal, wherein the thermistor is located at a position within a battery compartment of the battery charger remote from the negative charge contact; and discontinuing the applied charge when a cell temperature increase rate greater than a predetermined threshold is measured. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A method of cooling a rechargeable electrochemical cell in a battery charger, the method comprising:
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placing the rechargeable electrochemical cell comprising a positive cell terminal and a negative cell terminal in the battery charger, the battery charger comprising a controller and at least one battery compartment that receives the rechargeable electrochemical cell, the battery compartment comprising a positive charge contact engaging the positive cell terminal;
a negative charge contact engaging the negative cell terminal;
a thermistor engaging the negative cell terminal at a position remote from the negative charge contact, wherein the thermistor provides data output to the controller for determining a temperature rate increase of the cell; and
air-moving means attached to at least a portion of the battery charger; andmoving air across at least a portion of the electrochemical cell by said air-moving means, thereby cooling the rechargeable electrochemical cell.
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Specification