Method of determining the open circuit voltage of a battery in a closed circuit
First Claim
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1. A method of determining the open circuit voltage of a battery or cell operating in a closed circuit, without interrupting said circuit or substantially destabilizing said battery or cell, said method comprising:
- (1) measuring the battery or cell current (I1) and voltage (E1) under a given load,(2) altering said load by a fractional amount and remeasuring the battery or cell current (I2) and voltage (E2) under the altered load, and(3) calculating the open circuit voltage (Eoc) of the battery or cell from the relationship
space="preserve" listing-type="equation">E.sub.oc =E.sub.1 +(Δ
E/Δ
I)I.sub.1,where Δ
E is the absolute difference between E1 and E2 and Δ
I is the absolute difference between I1 and I2, the algebraic sign of I1 being negative when the battery or cell is on charge and positive on discharge.
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Abstract
The open circuit voltage of a battery which is connected in a closed circuit is determined without breaking the circuit or causing voltage upsets therein. The closed circuit voltage across the battery and the current flowing through it are determined under normal load and then a fractional change is made in the load and the new current and voltage values determined. The open circuit voltage is then calculated, according to known principles, from the two sets of values.
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3 Claims
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1. A method of determining the open circuit voltage of a battery or cell operating in a closed circuit, without interrupting said circuit or substantially destabilizing said battery or cell, said method comprising:
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(1) measuring the battery or cell current (I1) and voltage (E1) under a given load, (2) altering said load by a fractional amount and remeasuring the battery or cell current (I2) and voltage (E2) under the altered load, and (3) calculating the open circuit voltage (Eoc) of the battery or cell from the relationship
space="preserve" listing-type="equation">E.sub.oc =E.sub.1 +(Δ
E/Δ
I)I.sub.1,where Δ
E is the absolute difference between E1 and E2 and Δ
I is the absolute difference between I1 and I2, the algebraic sign of I1 being negative when the battery or cell is on charge and positive on discharge. - View Dependent Claims (2, 3)
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Specification