Cell evaluating method and cell evaluating apparatus
First Claim
1. A cell evaluating method for evaluating characteristics of a secondary cell which can be repeatedly charged, comprising the steps of:
- detecting a cell voltage after a predetermined first charge operation for said secondary cell is started;
proceeding to a second charge operation if said detected cell voltage is lower than a reference voltage; and
determining a state of said secondary cell.
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Accused Products
Abstract
A cell evaluating method for evaluating characteristics of a secondary cell which can be repeatedly charged and which includes a step of detecting a cell voltage after a predetermined first charge operation for the cell is started, a step of, if the detected cell voltage is smaller than a reference voltage, proceeding to a second charge operation different from the predetermined first charge operation, and a step of evaluating a state of the cell. Moreover, the cell evaluating method includes a step of carrying out a first cell voltage detection after a first predetermined period of time has passed since a halt of the charge or discharge of a cell, a step of carrying out a second cell voltage detection after a second predetermined period of time has passed, and a step of evaluating, if the difference between the results of the first and second detections is not smaller than a predetermined value, that an internal short circuit occurs in the cell.
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Citations
16 Claims
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1. A cell evaluating method for evaluating characteristics of a secondary cell which can be repeatedly charged, comprising the steps of:
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detecting a cell voltage after a predetermined first charge operation for said secondary cell is started; proceeding to a second charge operation if said detected cell voltage is lower than a reference voltage; and determining a state of said secondary cell. - View Dependent Claims (2, 3, 4, 5)
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6. A cell evaluating method for evaluating characteristics of a secondary cell which can be repeatedly charged, comprising the steps of:
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detecting a first cell voltage after a first predetermined period of time has passed since either one of a charge and a discharge of said secondary cell has stopped; detecting a second cell voltage after a second predetermined period of time has passed; calculating a difference between said first cell voltage and said second cell voltage; and determining that an internal short circuit occurs in said secondary cell if said difference exceeds a predetermined value. - View Dependent Claims (7, 8)
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9. A cell evaluating apparatus for evaluating characteristics of a secondary cell which can be repeatedly charged, comprising:
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means for detecting a cell voltage after a predetermined first charge operation for said secondary cell is started; means for proceeding to a second charge operation different from said predetermined first charge operation if said detected cell voltage is lower than a reference voltage; and means for determining a state of said secondary cell. - View Dependent Claims (10, 11, 12, 13)
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14. A cell evaluating apparatus for evaluating characteristics of a secondary cell which can be repeatedly charged, comprising:
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means for detecting a first cell voltage after a first predetermined period of time has passed since either one of a charge and a discharge of said secondary cell; means for detecting a second cell voltage after a second predetermined period of time has passed; and means for calculating a difference between said first cell voltage and said second cell voltage and for determining if said difference exceeds a predetermined value indicating that an internal short circuit occurs in said secondary cell. - View Dependent Claims (15, 16)
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Specification