Electrical cell charge energy measuring method and apparatus
First Claim
1. Method for non-destructive testing of the charge energy availability of an electrochemical cell of the substantially constant-voltage-during-discharge type, comprising:
- establishing a substantially-zero-impedance information-generating short-circuit current path across the terminals of the cell under test,deriving information respecting integrated current flow through said short-circuit current path during a precise period of time, andutilizing such information to represent the extent of charge energy available from such cell.
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Abstract
Method and apparatus for measuring the charge energy available from electrochemical cells (batteries) of the type that exhibits a substantially constant discharge voltage characteristic over its charge life, such as zinc-silver oxide cells. Within several seconds following a brief period of shorting out for reactivation, two to four seconds in the case of zinc-silver oxide cells, short circuit current from the test cell flowing for a period of time just sufficient for complete charging of the internal capacitance of such test cell is sensed, integrated over such period, and used to control display of information as to the charge level of the cell under test.
37 Citations
10 Claims
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1. Method for non-destructive testing of the charge energy availability of an electrochemical cell of the substantially constant-voltage-during-discharge type, comprising:
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establishing a substantially-zero-impedance information-generating short-circuit current path across the terminals of the cell under test, deriving information respecting integrated current flow through said short-circuit current path during a precise period of time, and utilizing such information to represent the extent of charge energy available from such cell. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for non-destructive testing of the charge energy availability of an electrochemical cell of the substantially-constant-voltage-during-discharge type, comprising:
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zero-impedance means for short-circuiting said cell, contact means for connecting a cell to said zero-impedance means, information deriving means responsive to integrated current flow from said cell through said zero-impedance means, cell-energy-availability display means responsive to information from said deriving means, and program means controlling the period of effectiveness of said zero-impedance means and of said information deriving means. - View Dependent Claims (7, 8, 9, 10)
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Specification