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Method for estimating the ageing of a cell of a storage battery

A technology for battery cells and storage batteries, applied in the field of charge and discharge cycle management, which can solve the problems of not monitoring battery cells, lack of accuracy and reliability, etc.

Active Publication Date: 2016-07-27
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The main disadvantages of this estimation method are constituted firstly by its lack of precision and reliability, secondly by its failure to monitor defective cells within the battery, and thirdly by its Misinterpretations caused by aging constitute

Method used

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  • Method for estimating the ageing of a cell of a storage battery
  • Method for estimating the ageing of a cell of a storage battery
  • Method for estimating the ageing of a cell of a storage battery

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Embodiment Construction

[0044] Firstly, in the following description, the term "accumulator" will be understood to mean an element capable of storing electrical energy when supplied with current by an external electrical network and then subsequently capable of releasing such electrical energy. A storage battery of this type can be, for example, of an electrochemical type (eg lithium-ion) or of a different type (eg capacitor).

[0045] figure 1 A motor vehicle 1 is shown very schematically.

[0046] The motor vehicle 1 is here an electric vehicle. It thus comprises an electric motor 10 provided to drive in rotation the drive wheels 20 of said vehicle.

[0047] In a variant, the vehicle may be a hybrid vehicle comprising an internal combustion engine and an electric motor for driving the drive wheels of said vehicle.

[0048] as in figure 1 As shown in , the motor vehicle 1 includes an accumulator known as a traction battery 40 .

[0049] This traction battery 40 is provided here exclusively to s...

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Abstract

The invention relates to a method for estimating the ageing of at least one cell of a storage battery, comprising the following steps: a) acquiring a voltage (Vcell) across the terminals of said cell and an amperage (I) passing through said cell, and b) calculating a maximum capacitance and a level of charge of said cell in accordance with the voltage and the amperage acquired in step a). According to the invention, in step b), the calculation is made by resolving: a system of discretised equations corresponding to a modelling of said cell as an electric circuit (42) comprising, in series, an ideal voltage source (Eeq), a resistor (R omega), a first resistor (Rct) and capacitor (Cdl) pair connected in parallel, and at least one second resistor (Ri) and capacitor (Ci) pair connected in parallel; and a discretised equation for estimating the variation in the maximum capacitance of said cell.

Description

technical field [0001] The present invention generally relates to the management of charge and discharge cycles of batteries. [0002] The invention relates in particular to a method for estimating the aging of at least one cell of an accumulator, said method comprising the following steps: [0003] a) collecting the voltage at the terminals of the battery cell and the amperage of the current through the battery cell, [0004] And b) calculating the maximum capacity and state of charge of the battery cell according to the voltage and current amperage collected in step a). [0005] The invention can be applied particularly advantageously to motor vehicles equipped with electric motors powered by accumulators known as traction batteries. Background technique [0006] It is well known that the electrical power that can be supplied by a battery decreases during a discharge cycle. The maximum amount of energy that can be stored by the accumulator then gradually decreases over ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/392G01R31/396Y02E60/10G01R31/388H01M10/48G01R31/3648
Inventor L·加尼厄尔A-L·德里迈尔-佛朗哥C·福尔热
Owner RENAULT SA