Method for automatic estimation of state of charge of battery cells of a battery pack
A battery unit, state-of-charge technology, applied in battery/fuel cell control devices, electric vehicles, measuring electricity, etc., can solve problems such as frequency is not simple, and achieve the effect of improving estimation accuracy, increasing computing power, and reducing computing power
Active Publication Date: 2020-02-18
RENAULT SA
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Problems solved by technology
However, setting the estimated capacity C n,k3 The frequency is not simple
Additionally, it has been observed that the estimated capacity C n,k3 The choice of the frequency of has a direct effect on the accuracy of the estimates obtained, and in the estimated capacity C n,k3 There is no simple relationship between the frequency of a battery cell's state of charge and the accuracy of the estimate
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[0033] In these figures, the same reference numerals are used to designate the same elements. In the remainder of the specification, features and functions well known to those skilled in the art are not described in detail.
[0034] In this specification, "calculation power" refers to the number of operations performed by an electronic calculator. Therefore, reducing computational power means reducing the number of operations to be performed in order to achieve the same result or a result of the same nature.
[0035] figure 1 An electric traction motor vehicle 2 is shown, which is more broadly referred to as an "electric vehicle". Electric vehicles are well known and only the structural elements necessary to understand the remainder of this description are presented. Vehicle 2 includes:
[0036] - an electric motor 4 rotatably driving the powered wheels 6 to drive the vehicle 2 along the road 8 , and
[0037] - A battery pack 10 which supplies the motor 4 with electrical ...
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The invention relates to a method for estimating the state of charge of a battery cell, the method comprising the steps of: - inhibiting ( 164 ) the complete execution of the method for estimating the capacity C of the battery cell as long as the value of the parameter does not exceed a predetermined threshold n,k3 An algorithm where the measured value y of the voltage between the terminals of the battery cell is k , the estimated state of charge SOC of the battery cell k and the amount of discharge current Q of the battery cell between time k and the previous time k Select the parameter in , then – when the parameter in the parameter is the measured value y k or estimated state of charge SOC k falls below a predetermined threshold or in the event that the parameter is the amount of discharge current Q k When the case rises above a predetermined threshold, the startup (164) is fully executed for estimating the capacity C n,k3 algorithm.
Description
technical field [0001] The invention relates to a method for automatic estimation of the state of charge of battery cells of a battery pack, as well as a storage medium and a battery pack management system for implementing the method. The invention also relates to a motor vehicle comprising such a battery management system. Background technique [0002] Known methods for estimating the state of charge of the cells of a battery pack include: [0003] - Repeat the following steps at time k: [0004] a) Obtain a measurement y of the voltage between the terminals of the battery cell at instant k k and the measured intensity i of the current that charges or discharges the battery cell k , [0005] b) at time k according to the measured value y k , measure the intensity i k and the capacity of the battery cell C n,k3 to estimate the state of charge of the battery cell, the capacity C n,k3 Expressed in Ah, it represents the maximum electrical energy that can be stored in th...
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IPC IPC(8): G01R31/387
CPCG01R31/367G01R31/3648B60L58/12Y02T10/70G01R31/389
Inventor 文森特·海里斯西尔万·莱朗
Owner RENAULT SA