Cell protection apparatus and method for a battery cell system
First Claim
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1. A cell protection apparatus for preventing regenerative power from flowing into a battery cell in a battery cell system, said battery cell having a terminal voltage, comprising:
- switching means connected to a battery cell, said switching means connecting and disconnecting said battery cell with a load;
voltage detecting means connected across said battery cell by said switching means, said voltage detecting means measuring the terminal voltage of said battery cell and providing a detection signal representative thereof;
comparator means coupled to said voltage detecting means to receive said detection signal, said comparator means generating a comparator output signal when the terminal voltage measured by said detecting means exceeds a predetermined voltage value; and
trip circuit means coupled to said comparator means and said switching means, said trip circuit means opening said switching means to disconnect said battery cell from said load in response to said comparator output signal.
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Abstract
Reverse current to a battery cell is prevented without using a diode for preventing the reverse current. The reverse current protection is obtained by detecting the terminal voltage across the cell, and by opening a switching means connected to the cell when the terminal voltage of the cell increases more than a predetermined voltage value. The predetermined voltage value is determined in accordance with the I/V characteristics of the cell.
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Citations
9 Claims
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1. A cell protection apparatus for preventing regenerative power from flowing into a battery cell in a battery cell system, said battery cell having a terminal voltage, comprising:
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switching means connected to a battery cell, said switching means connecting and disconnecting said battery cell with a load; voltage detecting means connected across said battery cell by said switching means, said voltage detecting means measuring the terminal voltage of said battery cell and providing a detection signal representative thereof; comparator means coupled to said voltage detecting means to receive said detection signal, said comparator means generating a comparator output signal when the terminal voltage measured by said detecting means exceeds a predetermined voltage value; and trip circuit means coupled to said comparator means and said switching means, said trip circuit means opening said switching means to disconnect said battery cell from said load in response to said comparator output signal. - View Dependent Claims (2, 3, 4, 5)
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6. A cell protection method for preventing regenerative power from flowing into a battery cell in a battery cell system, said battery cell having a terminal voltage, comprising the steps of:
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measuring the terminal voltage of a battery cell to detect whether the terminal voltage across said battery cell exceeds a predetermined voltage value; and interrupting the flow of regenerative power into said battery cell when the terminal voltage exceeds said predetermined voltage value. - View Dependent Claims (7, 8, 9)
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Specification