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Method for estimating characteristic physical quantities of an electric battery

A physical quantity and battery technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems affecting accuracy and negative effects

Inactive Publication Date: 2017-11-28
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice this is not always the case, with the risk of negatively affecting the accuracy of estimates of physical quantities belonging to battery characteristics

Method used

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  • Method for estimating characteristic physical quantities of an electric battery
  • Method for estimating characteristic physical quantities of an electric battery
  • Method for estimating characteristic physical quantities of an electric battery

Examples

Experimental program
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Embodiment Construction

[0045] figure 1 The battery BAT that supplies current to a piece of electrical equipment APP is shown. The voltage U across the terminals of the battery BAT is measured by the voltage sensor V. The intensity I of the current output by the battery BAT is measured by the current sensor A. The analog-to-digital converter allows the values ​​of this voltage U and this intensity I to be sampled and digitized. The data thus obtained is used by the processor CPU to estimate the value RES of the physical quantity belonging to the characteristics of the battery BAT according to the method belonging to the subject of the invention. The memory module MEM is specifically used to store the information needed for this operation.

[0046] figure 2 Showed that with figure 1 The circuit diagram corresponding to the exemplary model of the battery. As here figure 2 As shown in, the battery BAT is here modeled by a circuit that includes an ideal voltage source U in series OC , Resistor R 0 And...

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PUM

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Abstract

The invention relates to a method for estimating characteristic physical quantities of an electric battery (BAT), which involves acquiring electric voltage values (U) at the terminals of the electric battery, as well as values of the intensity (I) of the current delivered by the battery, for a predetermined duration. According to the invention, the values of said physical quantities are obtained by solving a system of linear equations modelling the electrical behaviour of the electric battery: in which the unknown factors are mathematically linked to said physical quantities, and in which the coefficients are obtained beforehand, by integration of functions of the voltage or of functions of the intensity over the predetermined duration.

Description

Technical field [0001] The present invention generally relates to the monitoring of batteries. [0002] The present invention more specifically relates to a method for estimating physical quantities belonging to battery characteristics, and the method includes the following steps: [0003] a) Obtain the value of the voltage across the terminals of the battery and the value of the intensity of the current output by the battery within a certain period of time; and [0004] b) Calculate the quantity, which includes, for example, the internal resistance of the battery as a function of the voltage and current intensity obtained in step a). [0005] The invention is particularly advantageously applied to a motor vehicle equipped with an electric motor powered by a battery called a drive battery. Background technique [0006] It is well known that the power that a battery can provide decreases during the discharge cycle. [0007] It is also well known that the maximum charge capacity of a batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/389
Inventor S·莱伦斯
Owner RENAULT SA