APPARATUS AND METHOD FOR DETERMINING BATTERY/CELL'S PERFORMANCE, AGE, AND HEALTH
First Claim
1. A method for generating data to evaluate quality of a galvanic cell to be tested,wherein parameters of a good quality reference cell of the same type are generated by performing the following operations:
- a) measuring temperature of said cell versus time;
b) measuring voltage of said cell in load-free condition;
c) applying a predetermined load current across a comparator resistor to the cell for a first predetermined periodd) measuring voltage of said cell versus time during said first predetermined period;
e) measuring voltage drop on said comparator resistor caused by load current flowing from said cell d versus time during said first predetermined period;
f) switching off said load after the expiry of said first predetermined period;
g) measuring voltage of the cell versus time for a second predetermined period after switching off said loadh) normalizing data obtained by said steps a) to g) to a predetermined temperaturei) setting up a look-up table MDT including said normalized data identifying the type of the said cell and measured data;
j) generating parameters of the cell to be tested by performing the same operations as defined in steps a) to h);
k) conveying data gained as defined in j) for comparing them to the data of said look-up table MDT.
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Abstract
A self-energized measuring system for determining primary and secondary battery/cell'"'"'s performance, age, and health by measuring and recording battery/cell'"'"'s voltage response to a specified load-changing perturbation spot-test event. The cell'"'"'s voltage response is compared to a synchronously measured voltage signal of a comparator resistor. The relationship between the two voltage signals is analyzed on logarithmic time scale to determine performance parameters such as cell impedance and power and their variation in the time domain. The cell temperature is also measured for impedance and power normalization for 20 centigrade. Results are compared to a previously generated master data tabulation characteristic of a similar, new cell of perfect health condition. The time-domain performance parameters are related to the performance, age and health of the cell at any particular instant. The evaluation method can be easily adjusted to various battery chemistries, types.
35 Citations
11 Claims
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1. A method for generating data to evaluate quality of a galvanic cell to be tested,
wherein parameters of a good quality reference cell of the same type are generated by performing the following operations: -
a) measuring temperature of said cell versus time; b) measuring voltage of said cell in load-free condition; c) applying a predetermined load current across a comparator resistor to the cell for a first predetermined period d) measuring voltage of said cell versus time during said first predetermined period; e) measuring voltage drop on said comparator resistor caused by load current flowing from said cell d versus time during said first predetermined period; f) switching off said load after the expiry of said first predetermined period; g) measuring voltage of the cell versus time for a second predetermined period after switching off said load h) normalizing data obtained by said steps a) to g) to a predetermined temperature i) setting up a look-up table MDT including said normalized data identifying the type of the said cell and measured data; j) generating parameters of the cell to be tested by performing the same operations as defined in steps a) to h); k) conveying data gained as defined in j) for comparing them to the data of said look-up table MDT. - View Dependent Claims (2, 3, 4, 8, 9, 10, 11)
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5. The method as claimed in claim'"'"', wherein said load defined in c) comprises at least two different loads.
- 6. The method claimed in claim'"'"', wherein said measurements effected during said predetermined periods are performed at sampling intervals not longer than 50 ms, preferably 25 ms, particularly not longer than 10 ms at the beginning of said predetermined periods.
Specification