Battery charge apparatus controlled by detecting charge current with constant charge voltage
First Claim
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1. Apparatus for charging a battery, said apparatus comprising:
- means for generating a constant voltage and applying it to a nonaqueous, organic electrolyte, lithium secondary battery for generating a charging current therein, said charging current decreasing rapidly as a function of time from an initial maximum current to a stable, low level of charging current substantially equal to 10% of said initial maximum current;
a detecting circuit responsive to said charging current for generating a control signal when said charging current becomes smaller than a reference value substantially equal to said stable, low level of charging current; and
means responsive to the control signal for controlling said charging current.
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Abstract
A nonaqueous secondary battery is charged by a constant voltage. The charging current decreases with time, and, when it becomes smaller than a predetermined reference value, the charging is controlled either by terminating the charging current or by setting it at a very low value.
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Citations
6 Claims
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1. Apparatus for charging a battery, said apparatus comprising:
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means for generating a constant voltage and applying it to a nonaqueous, organic electrolyte, lithium secondary battery for generating a charging current therein, said charging current decreasing rapidly as a function of time from an initial maximum current to a stable, low level of charging current substantially equal to 10% of said initial maximum current; a detecting circuit responsive to said charging current for generating a control signal when said charging current becomes smaller than a reference value substantially equal to said stable, low level of charging current; and means responsive to the control signal for controlling said charging current. - View Dependent Claims (2, 3, 5, 6)
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4. Apparatus for charging a battery, said apparatus comprising:
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means for generating a constant voltage and applying it to a nonaqueous, organic electrolyte, lithium secondary battery for generating a charging current therein, said lithium secondary battery having a charging current characteristic that rapidly decreases from an initial maximum level before reaching a stable low level that is substantially equal to 10% of said initial maximum level; a detecting circuit connected to said means for generating a constant voltage for detecting said charging current; and an electronic switch connected between said detecting circuit and said secondary battery which is turned OFF by an output signal of said detecting circuit when a value of said charging current becomes smaller than a predetermined value substantially equal to said stable low level of charging current.
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Specification