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Method for assessing a state of charge of a battery comprising a plurality of cells having a variable range of use of state of charge

A state of charge, battery unit technology, applied in the arrangement of multiple synchronous batteries, battery/fuel cell control devices, battery circuit devices, etc., can solve the problems of power loss, variability and harmfulness of the maximum amount of stored energy

Active Publication Date: 2016-11-16
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Variability in the maximum amount of stored energy is detrimental for the user, as it can lead to unfavorable situations such as an empty fuel tank or loss of power during overtaking: these can be caused by a poor assessment of the state of charge of the battery. Happening

Method used

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  • Method for assessing a state of charge of a battery comprising a plurality of cells having a variable range of use of state of charge
  • Method for assessing a state of charge of a battery comprising a plurality of cells having a variable range of use of state of charge
  • Method for assessing a state of charge of a battery comprising a plurality of cells having a variable range of use of state of charge

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Embodiment Construction

[0038] In the following, electrochemical cells comprising N series connected electrochemical cells C will be considered 1 to C N battery. During operation, the same current I BAT Thus through N battery cells, and the voltage at the terminals of the battery U BAT always corresponds to N voltages U taken at the terminals of N battery cells 1 to U N Sum.

[0039] According to the invention, an estimate of the state of charge of the battery is obtained on the basis of two specific values ​​of N cell voltages at a given moment, one estimate corresponding to the minimum value of all cell voltages, referred to as the minimum cell voltage , the other evaluation value corresponds to the maximum value of all cell voltages, referring to the maximum cell voltage, these two values ​​are denoted as U Cmin and U Cmax . Each battery cell C 1 to C N The state of charge SOC includes the minimum allowable state of charge value BSOC min And the maximum allowable battery state value BSO...

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Abstract

The invention relates to a method for assessing a state of charge (SOCpack) of a battery comprising a plurality of electrochemical cells (C1,...CN) connected in series. Each cell (C1,...CN) has a state of charge (SOC) within a range of use of a state of charge, including a minimum allowable state of charge value (BSOCmin) and a maximum allowable state of charge value (BSOCmax). The method comprises a step that involves assessing the state of charge of the pack SOCpack on the basis of the minimum state of charge (SOCmin) and of the maximum state of charge (SOCmax) and on the basis of a minimum allowable state of charge value (BSOCmin) and a maximum allowable state of charge value (BSOCmax). Said minimum allowable state of charge value (BSOCmin) and said maximum allowable state of charge value (BSOCmax) of each cell are adjusted on the basis of at least one physical quantity representing a state of health of the cell and / or the temperature.

Description

technical field [0001] The present invention relates to a method and system for assessing the state of charge of a battery comprising a plurality of electrochemical cells connected in series. [0002] The present invention can be applied regardless of the kind of battery, and is non-exclusively extended to vehicles. In particular, the invention is particularly applicable in industrial fields such as automobiles and in computing fields; the invention is applicable to any system, whether on-board or not. Background technique [0003] In the non-limiting domain of electric and hybrid vehicles, one of the main challenges of traction battery management systems is the assessment of the battery's state of charge, also known as SOC. This information is displayed on the dashboard in the form of a "battery gauge" and allows the driver to know how many kilometers of autonomy are left. Because the autonomy of an electric vehicle is much lower than that of a combustion-powered vehicle,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H02J7/00B60L11/18
CPCB60L3/0046B60L3/12B60L2240/545B60L2240/547B60L2240/549B60L2260/44B60L58/16B60L58/13B60L58/22G01R31/367G01R31/392G01R31/396Y02T10/70H02J7/0048H02J7/0013G01R31/374H02J7/0014
Inventor M·卢塞亚
Owner RENAULT SA
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