Residual capacity meter for electric car battery

Details Residual capacity meter for electric car battery Residual capacity meter for electric car battery

1993-07-12

1996-07-23

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324427, G01N 27416

Patent

active

055393187

ABSTRACT:
The voltage and current of a main battery used to drive a motor of an electric car is detected by a voltmeter and ammeter. The V-I characteristic is detected by a V-I characteristic computing means by reading the voltage and current when the battery current is equal to or greater than 0.75 C and is increasing (high load state). The relation between the two is stored, and from the actually measured V-I characteristic and the stored relation, the residual capacity of the battery is computed. The SOC is also determined by a SOC computing means 20 according to the power integration method, and the degree of deterioration of the battery is computed from this SOC and the residual capacity. By correcting the full charge capacity from the power integration method based on this degree of deterioration in order to compute the SOC, errors arising in the power integration method are prevented and measurement precision is improved.

REFERENCES:
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patent: 5166623 (1992-11-01), Ganio
patent: 5281919 (1994-01-01), Palanisamy
patent: 5404106 (1995-04-01), Matsuda
patent: 5451881 (1995-09-01), Finger

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