Battery ohmic resistance calculation system and method
First Claim
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1. An apparatus that estimates the ohmic resistances of N batteries, comprising:
- voltage and current measurement modules that respectively measure the voltage and current of each of the N batteries; and
an ohmic resistance estimating module that over N+1 time periods receives the voltage and current measurements of each of the N batteries and that receives consecutive voltage and current measurements for one of the N batteries, wherein N is a positive integer and wherein the ohmic resistance estimating module estimates an ohmic resistance of the battery that is associated with the consecutive voltage and current measurements, wherein the ohmic resistance is at least partially based on a difference between;
a quotient of a first voltage measurement minus a consecutive second voltage measurement divided by a first current measurement minus a consecutive second current measurement, anda previous value of the ohmic resistance.
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Abstract
An apparatus that estimates the ohmic resistances of N batteries includes voltage and current measurement modules that respectively measure the voltage and current of each of the N batteries. An ohmic resistance estimating module over N+1 time periods receives the voltage and current measurements of each of the N batteries and receives consecutive voltage and current measurements for one of the N batteries. N is a positive integer and the ohmic resistance estimating module estimates the ohmic resistance of the battery that is associated with the consecutive voltage and current measurements.
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Citations
21 Claims
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1. An apparatus that estimates the ohmic resistances of N batteries, comprising:
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voltage and current measurement modules that respectively measure the voltage and current of each of the N batteries; and an ohmic resistance estimating module that over N+1 time periods receives the voltage and current measurements of each of the N batteries and that receives consecutive voltage and current measurements for one of the N batteries, wherein N is a positive integer and wherein the ohmic resistance estimating module estimates an ohmic resistance of the battery that is associated with the consecutive voltage and current measurements, wherein the ohmic resistance is at least partially based on a difference between; a quotient of a first voltage measurement minus a consecutive second voltage measurement divided by a first current measurement minus a consecutive second current measurement, and a previous value of the ohmic resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of estimating the ohmic resistances of N batteries, comprising:
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periodically measuring the voltage and current of each of the N batteries and over N+1 periods measuring the voltage and current of each battery and consecutively measuring the voltage and current of one of the N batteries; and estimating an ohmic resistance of the battery associated with the consecutive measurements wherein the estimation is based on the consecutive measurements and wherein N is a positive integer, wherein the ohmic resistance is at least partially based on a difference between; a quotient of a first voltage measurement minus a consecutive second voltage measurement divided by a first current measurement minus a consecutive second current measurement, and a previous value of the ohmic resistance. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus that estimates the ohmic resistances of N batteries, comprising:
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voltage and current measurement means for respectively measuring the voltage and current of each of the N batteries; and ohmic resistance estimating means for periodically receiving the voltage and current measurements associated with the N batteries and over N+1 periods receiving the measurements associated with each of the N batteries and receiving consecutive voltage and current measurements for one of the N batteries, wherein N is a positive integer and wherein the ohmic resistance estimating means estimates the ohmic resistance of the battery that is associated with the consecutive voltage and current measurements, wherein the ohmic resistance is at least partially based on a difference between; a quotient of a first voltage measurement minus a consecutive second voltage measurement divided by a first current measurement minus a consecutive second current measurement, and a previous value of the ohmic resistance. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification