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Assessing energy in motor vehicle batteries

A battery and energy technology, applied in the direction of vehicle energy storage, electric vehicles, vehicle components, etc., can solve the problems of wrong measurement value, incorrect initial SOC estimation, and no battery allowed, and achieve the effect of accurate determination

Active Publication Date: 2018-10-19
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not allow taking into account changes in the battery's internal resistance or capacity over time
Furthermore, if the battery is not in a sufficiently relaxed state, the measurement of OCV used to determine the initial value of SOC may be wrong, resulting in an incorrect estimate of the initial value of SOC

Method used

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  • Assessing energy in motor vehicle batteries
  • Assessing energy in motor vehicle batteries
  • Assessing energy in motor vehicle batteries

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0079] refer to figure 1 An automotive vehicle 1 (such as an electric vehicle) may include a traction battery 2 designed to drive the vehicle, a system for managing the battery 3 (called BMS), and a user interface 4 (such as a dashboard).

[0080] The BMS 3 allows to control the charging and discharging of the battery 2 and to control the display of messages on the screen (not shown) of the user interface 4 .

[0081] The BMS 3 incorporates a device 5 for estimating the energy available or to be stored in the battery 2, for example part of a processor. In particular, this device 5 can be activated when the user turns the key to start the vehicle, but also during missions, or during the charging phase of the battery.

[0082] The BMS 3 communicates with voltage and current measurement devices such as a cell voltage measurement ASIC (ASIC: abbreviation for Application Specific Integrated Circuit) and an ammeter (not shown).

[0083] refer to figure 2 , the method according t...

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PUM

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Abstract

The invention relates to a method for estimating energy at constant power in a motor vehicle battery, the method comprising: (a) determining (30) a value for a capacity parameter Q, (b) for N values ​​of a state of charge parameter z Constructing (31) a value table of the battery terminal voltage parameter based on the value of the current parameter, (c) determining (32) the value of the internal resistance parameter R(z) based on the state of charge parameter z according to the table constructed in this step (b), (d) provide (33) a table of values ​​for the open circuit voltage parameter Uoc(z) based on the state of charge parameter z, (e) estimate (34) the value z0 of the initial state of charge parameter, (f) use the state of charge parameter z and A function of the values ​​of the parameters Q, R(z) and Uoc(z) is calculated to estimate (35) the value of the energy parameter Ep between the final state of charge and the initial state of charge.

Description

technical field [0001] The present invention relates to the control of automotive vehicle batteries. The invention relates in particular to the estimation of the energy available or extractable in the battery of an automotive vehicle, in particular an electric vehicle or a hybrid vehicle. The invention also relates to the estimation of the energy to be accumulated during the charging phase of the battery. Background technique [0002] For a given state of charge, or SOC, the energy extractable from a battery is a function of temperature. In fact, the lower the temperature of the battery, the higher the internal resistance of the battery. For the same current level, the average voltage may become lower for the entire discharge. [0003] It is known to equip automotive vehicles, for example, with a battery management system, or BMS, which allows, inter alia, an estimation of the available energy. The calculation of this available energy requires knowledge of the battery's ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/00G01R31/36
CPCB60L3/12B60L2240/547B60L2240/549B60L2260/44B60L58/12G01R31/367G01R31/374G01R31/389Y02T10/70G01R31/392G01R31/3842G01R31/007
Inventor S·莱伦斯S·拉利希
Owner RENAULT SA