Online estimation method of power lead-acid battery of special engineering vehicle

Abstract

The invention provides an online estimation method of a power lead-acid battery of a special engineering vehicle. The method comprises the following steps: 1, calculating an initial residual capacity SOC0 and an effective rated capacity Qt of a battery when a battery management system is powered on; 2, during charge and discharge process of the battery, using a corrected ampere-hour integration method to calculate the residual capacity of the battery; 3, using an internal resistance method based on a battery model to correct the residual capacity; and 4, outputting an online estimation result. The method utilizes a simple and practical SOC estimation model, integrates various factors, which affect the residual capacity of the storage battery, into the battery model, improves the estimation precision of the residual capacity of the battery, and has great practical meaning.

Description

technical field [0001] The invention relates to the field of battery application technology, and particularly relates to an online estimation method for the remaining capacity of a power lead-acid battery for a special engineering vehicle. Background technique [0002] At present, the power supply mode of the power supply and distribution system of special engineering vehicles has changed from the traditional single power supply mode of the internal combustion generator set to the multi-power joint power supply mode with the battery pack as the main power supply. In this mode, the lead-acid battery pack is mainly used to provide DC power for each load device in the special engineering vehicle. System reliability and security. Therefore, the estimation accuracy of the remaining capacity (SOC for short) of the lead-acid battery is particularly important. The capacity of the lead-acid battery is related to many parameters of the battery's electrical characteristics (such as c...

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Problems solved by technology

[0003] At present, the methods used at home and abroad mainly include the discharge test method and the ampere-hour integration method. The discharge method is only suitable for the application of the battery in the laboratory test, and cannot dynamically evaluate the remaining capacity of the battery in the real vehicle. The ampere-hour integration method is to collect the battery. The current is integrated with time, and the management system samples the charging and discharging current of the battery to obtain discrete current values. The current integration is the cumulative sum of discrete data. Due to the sampling accuracy and sampling period, the sampling value will not be able to fully achieve the integral function and will generate cumulative errors

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