Battery condition monitoring method and apparatus
First Claim
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1. A battery condition monitoring device for testing a rechargeable battery, comprising:
- an external load engageable with a battery;
a function generator connected to the battery and producing an output signal as a function of the terminal voltage of the battery immediately upon engagement of the load;
a timing circuit connected to the battery for establishing a test time period;
comparison means connected to said function generator for comparing the value of said function at the end of said test time period with preselected voltage references, the comparisons determining the condition of said battery; and
display means connected to said comparison means for indicating the condition of said battery.
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Abstract
A battery condition monitoring device which senses battery terminal voltage and creates a function thereof and tests that function against predetermined criteria and determines battery condition as a result of such tests. Further, the invention operates on the transient of the battery terminal voltage existant immediately upon the loading of the battery. The test is performed on the slope of the terminal voltage transient and a function of that transient during a test period is created, analyzed and evaluated against reference levels.
21 Citations
13 Claims
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1. A battery condition monitoring device for testing a rechargeable battery, comprising:
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an external load engageable with a battery; a function generator connected to the battery and producing an output signal as a function of the terminal voltage of the battery immediately upon engagement of the load; a timing circuit connected to the battery for establishing a test time period; comparison means connected to said function generator for comparing the value of said function at the end of said test time period with preselected voltage references, the comparisons determining the condition of said battery; and display means connected to said comparison means for indicating the condition of said battery. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery condition determination device, comprising:
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an external load switchably interconnected to the battery; first circuit means connected to the battery for creating an output voltage as a function of the terminal voltage of the battery under said external load; comparator means connected to said first circuit means and receiving said output voltage and comparing the same against fixed reference levels; display means connected to said comparator means for indicating the comparison between said output voltage and said reference levels; and timing means interconnected between said display means and said battery for enabling said display means after a fixed duration of time. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification