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Method for detecting faulty cell in electric battery

A technology of battery cells and battery packs, which is applied in the direction of testing electrical devices in transportation, battery/fuel cell control devices, measuring current/voltage, etc., and can solve problems such as complex implementation and complex implementation

Pending Publication Date: 2020-08-28
RENAULT SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantage of the method described in this document is that it is very complex to implement, since it requires very accurate knowledge of the electrochemistry of the battery cell and very high computing power
[0006] Therefore, current methods either do not have sufficient performance to distinguish actual faults from natural discharges, or are very complex to implement

Method used

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  • Method for detecting faulty cell in electric battery
  • Method for detecting faulty cell in electric battery
  • Method for detecting faulty cell in electric battery

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Embodiment Construction

[0031] refer to figure 1 , a method from the prior art for detecting a faulty battery cell in a battery pack comprises:

[0032] - the step of measuring the voltage across the terminals of each battery cell in the battery pack,

[0033] - a step of estimating the SOC of each of said battery cells,

[0034] - the step of determining the SOC difference between the most charged battery cell and the least charged battery cell,

[0035] - A step of detecting a faulty battery cell if the difference is greater than or equal to a predetermined value (for example, the predetermined value may be equal to 20% or 30%).

[0036] Detection of at least one faulty battery cell in a battery pack is usually accompanied by the step of inhibiting charging of said battery pack, since the battery pack is considered inoperable due to the presence of at least one faulty battery cell. Therefore, it is necessary to replace each failed battery cell with a new battery cell equipped with full capacity ...

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Abstract

The invention relates to a method for detecting a faulty cell in an electric battery pack, which comprises the following steps: - a step of measuring the no-load voltage at the terminals of each cellof the battery pack; - a step of calculating the deviation between the no-load voltage measured at the terminals of said cell and an average known no-load voltage as a function of the number of days during which the battery pack was not used; - a step of calculating the difference between said calculated deviation and a quantity n.sigma, wherein n is an integer no lower than 1, and sigma is a known standard deviation which is a function of the number of days during which the battery pack was not used; and - a step of detecting a faulty cell if said difference is greater than zero.

Description

technical field [0001] The invention relates to a method for detecting faulty cells in a battery. Background technique [0002] Currently, there are diagnostic procedures that make it possible to protect unbalanced battery packs from faulty cells. However, this imbalance is not necessarily due to faulty cells, but rather simply due to deviations in self-discharge. [0003] Specifically, the diagnostic procedure usually consists in measuring the voltage in order to estimate the SOC (state of charge) difference between the most charged battery cell and the least charged battery cell. Therefore, if the difference is greater than a predetermined threshold, recharging of the vehicle will be inhibited. Therefore, once the vehicle is discharged, the vehicle is left untouched and must be returned to the dealer for repairs. However, as we have been able to demonstrate, there may be "natural" self-discharge deviations inherent in technology or production batches that may give the f...

Claims

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Application Information

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IPC IPC(8): G01R31/382G01R31/396
CPCG01R31/3648H01M10/48G01R31/367G01R31/396Y02E60/10Y02T10/70G01R31/382G01R19/10G01R19/165G01R31/3646G08B21/185G01R31/392G01R31/3835G01R31/371B60L58/10G01R31/006
Inventor B·德洛贝尔M·奥里古奇B·阿尔萨克
Owner RENAULT SA
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