Method and system for estimating SOC (State-of-Charge) of power battery based on dynamic parameters

A dynamic parameter, power battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effects of high precision, fast convergence speed, and improved accuracy

Inactive Publication Date: 2017-06-13
SHENZHEN HYUTEEN NEW ENERGY CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the existing battery SOC estimation accuracy and speed

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  • Method and system for estimating SOC (State-of-Charge) of power battery based on dynamic parameters
  • Method and system for estimating SOC (State-of-Charge) of power battery based on dynamic parameters
  • Method and system for estimating SOC (State-of-Charge) of power battery based on dynamic parameters

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[0012] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0013] In order to facilitate the understanding of the embodiments of the present invention, further explanations will be given below with specific embodiments in conjunction with the accompanying drawings, which are not intended to limit the embodiments of the present invention.

[0014] figure 1 It is a schematic flowchart of a method for ...

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Abstract

The invention discloses a method and system for estimating SOC (State-of-Charge) of a power battery based on dynamic parameters. The method comprises the following steps: carrying out a discharge-standing experiment on the battery, obtaining OCV (Open Circuit Voltage)-SOC characteristic curves of the battery at different temperatures, and fitting out an OCV-SOC relational expression; carrying out a constant current pulse discharge-standing experiment on the battery, recording voltage response during the experiment, and identifying the initial value of the parameter of a battery second-order RC equivalent circuit model by an offline method; carrying out dynamic parameter identification on the second-order RC equivalent circuit model by using a forgetting factor-containing recursive least squares method RRFLS; carrying out online estimation on the SOC of the battery by using an EKF (Extended Kalman Filter) algorithm. The estimation method overcomes the defects of inaccuracy and cumulative error of the initial value of SOC in an ampere-hour integral method, and adapts to the dynamic change of battery characteristics, the battery model is high in precision and convergence speed, and is stable and reliable, and the precision of SOC online estimation is improved. The method and system can be widely used in fields of electric vehicles and energy storage battery management systems.

Description

technical field [0001] The invention relates to the field of electric vehicles and energy storage battery management systems, in particular to a method and system for estimating the SOC of a power battery based on dynamic parameters. Background technique [0002] At present, domestic and foreign methods for estimating the State of Charge (SOC) of power batteries mainly include: internal resistance method, ampere-hour integration method, open circuit voltage method, Kalman filter method, observer method, particle filter method and neural network method. Law. Among them, the internal resistance method is based on the functional relationship between the internal resistance of the battery and the SOC, and calculates the SOC of the battery by detecting the internal resistance of the battery. However, it is difficult to measure the internal resistance of the battery online and accurately, which limits the application of this method in practical engineering in the application. Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/389
Inventor 张瑞锋王海帆吴晋
Owner SHENZHEN HYUTEEN NEW ENERGY CO LTD
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