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Method for calibrating battery state of charge (SOC) based on battery aging characteristic

A battery state of charge and aging characteristics technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems that the state of charge value deviates from the correct value, prone to traffic accidents, power failure and breakdown, etc., to achieve travel convenience , reduce accidents, estimate accurate effects

Inactive Publication Date: 2016-05-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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AI Technical Summary

Problems solved by technology

At this time, the calculated state of charge value will seriously deviate from the correct value, providing wrong information to the driver, often resulting in a sudden power failure and breakdown of the vehicle during driving, which is prone to traffic accidents

Method used

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with specific examples.

[0022] A battery state of charge calibration method based on battery aging characteristics, comprising the following steps:

[0023] S1. Obtain the historical test data of the actual full capacity of the battery pack under the same working conditions, different mileage, and different charge and discharge times, and construct a calculation regression model for the actual full capacity of the battery pack with respect to the mileage and the number of charge and discharge times;

[0024] In the MCU main program of the battery management system, the actual full capacity of the battery pack is defined as a function Capacity(s, n), where the independent variables of the function are the mileage s and the number of charge and discharge times n. The operating data under working conditions is obtained by polynomial fitting, which can be a linear function or a quadratic function about t...

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PUM

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Abstract

The invention provides a method for calibrating a battery state of charge based on a battery aging characteristic. The method comprises the steps of establishing a calculation regression model of actual battery pack full electric capacity about traveled distance and charge-discharge frequency, working out the actual full electric capacity of a current battery pack according to the calculation regression model, and obtaining the SOC value of the calibrated current battery pack according to the actual full electric capacity of the current battery pack. According to the method, the state of charge is calibrated according to the aging characteristic of the battery, so that estimation of the rest energy of the battery pack is more accurate, a driver is guided to do correct driving actions on different situations, accidents caused by energy of a vehicle are reduced, and convenience is brought to travel of the driver.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a battery state-of-charge calibration method based on battery aging characteristics. Background technique [0002] Estimation of the state of charge of the battery is one of the most basic and important functions of the battery management system, which provides energy information to the driver to ensure the safe driving of electric vehicles. The actual capacity of the battery at full charge has a critical impact on the accuracy of the battery state of charge estimation. The current battery management system often regards the rated capacity of the battery when it leaves the factory as the actual capacity of the battery when it is fully charged. In fact, as the number of battery charge and discharge cycles increases and the mileage increases, the battery will continue to age, and its actual capacity will decline. trend. After the battery has been in operation for two ...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/382
Inventor 汪平吴建忠王奔
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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