An automatic online correction method for battery SOC

A SOC-OCV, battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of not being able to automatically correct the battery SOC in real time and online, and achieve the effect of accurate SOC correction results

Active Publication Date: 2022-04-29
ZHENGZHOU YUTONG BUS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides an automatic online correction method for battery SOC under plug-in working conditions, and aims to solve the problem in the prior art that the battery SOC under plug-in working conditions cannot be corrected automatically and in real time

Method used

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  • An automatic online correction method for battery SOC
  • An automatic online correction method for battery SOC

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Embodiment 1

[0036] The present invention imitates the high-end correction and low-end correction (i.e. full charge correction and discharge charge correction) of the battery under the pure electric working condition, and sets two charging and discharging working conditions respectively for the plug-in working condition. Correct condition to prevent SOC error from increasing continuously.

[0037] In order to facilitate the description of the SOC correction problem of the battery in the real-time state, two concepts are defined here, pseudo-static and static. We define that the process in which the current is continuously less than ±5A and can last for 1 to 10 minutes is called a pseudo-static process, and it is called a static process if it is kept for more than 10 minutes. Under static conditions, the voltage range of the battery is very small. Under pseudo-static conditions, depending on the working conditions, the voltage may increase or decrease significantly due to the different pola...

Embodiment 2

[0044] The difference between the second embodiment and the first embodiment is that two characteristic points are respectively set on the SOC-OCV charging curve and the SOC-OCV discharging curve, and the battery SOC is corrected according to the state of the battery.

[0045] Such as figure 1 As shown, the first characteristic point is set in the SOC-OCV discharge curve, that is, the correction condition 1 described in the figure, which is used as a reference for correcting the battery SOC when the battery is in a discharging state.

[0046] Such as figure 2 As shown, the second characteristic point is set in the SOC-OCV charging curve, that is, the correction condition 2 described in the figure, which is used as a reference for correcting the battery SOC when the battery is in a charging state.

[0047] Set the variable to record the average voltage of the battery at 1.5 minutes and the average voltage of the battery at 2 minutes during the pseudo-static process, compare t...

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Abstract

The invention relates to an automatic online correction method for battery SOC. According to the relationship between SOC and open circuit voltage on the SOC-OCV curve, avoiding the gentle area of ​​the curve, and setting at least two feature points: a first feature point and a second feature point , and the voltage of the first feature point is greater than the voltage of the second feature point, and the SOC value and voltage value corresponding to each feature point are obtained; under the set conditions, the highest cell voltage or the lowest cell voltage of the battery and the corresponding SOC are detected in real time value; compare and judge the battery cell voltage and the voltage value corresponding to the characteristic point, the cell SOC value and the SOC value corresponding to the characteristic point, and correct the battery SOC according to the judgment result. It solves the problem that in the prior art, the defect cannot be detected automatically and online, so that the SOC value cannot be corrected in time.

Description

technical field [0001] The invention relates to an automatic online correction method for battery SOC, which belongs to the field of power batteries for electric vehicles. Background technique [0002] With the rapid development and popularization of the new energy vehicle market, new energy vehicles have gradually been accepted by the public. The normal use and control of the battery depends on the battery management system, and SOC (battery state of charge) is one of the most important algorithms in the battery management system. Accurately estimating the SOC of the battery can enable users to accurately grasp the amount of remaining power. Determine battery life. Accurate SOC calculation is also the basis for further implementation of other related strategies, which can ensure the reliability of vehicle operation. [0003] At present, most of the vehicles used in the market are pure electric vehicles, and plug-in vehicles account for a small proportion. The working con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/382G01R35/00
CPCG01R35/005G01R31/367
Inventor 周雪松张红涛游祥龙涂洪成武剑锋王岩李龙
Owner ZHENGZHOU YUTONG BUS CO LTD
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