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Automatic online correction method for SOC (state of charge) of battery

A SOC-OCV and battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem that the battery SOC cannot be corrected automatically and online in real time, and achieve the effect of accurate SOC correction results

Active Publication Date: 2019-07-05
ZHENGZHOU YUTONG BUS CO LTD
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  • Summary
  • 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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  • Automatic online correction method for SOC (state of charge) of battery
  • Automatic online correction method for SOC (state of charge) of battery
  • Automatic online correction method for SOC (state of charge) of battery

Examples

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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] like 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] like 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 the ave...

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Abstract

The invention relates to an automatic online correction method for the SOC (state of charge) of a battery. According to the method, on the basis of change relationships between states of charge and open-circuit voltages on an SOC-OCV curve, at least two feature points, namely, a first feature point and a second feature point, are set in areas except the gentle areas of the curve, the voltage of the first feature point being greater than the voltage of the second feature point; an SOC value and a voltage value corresponding to each feature point are obtained; the highest unit voltage or lowestunit voltage of the battery and a corresponding SOC value of the battery are detected in real time under set conditions; and comparative judgment is performed on the unit voltage of the battery and the voltage values corresponding to the feature points, and the SOC value of the unit battery and the SOC values corresponding to the feature points, and the SOC of the battery is corrected according tojudgment results. With the automatic online correction method for the SOC (state of charge) of the battery of the invention adopted, the problems of failure to timely correct an SOC value caused by failure to automatically detect defects online in the prior art can be solved.

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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IPC IPC(8): G01R31/36G01R35/00
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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