Power battery model parameter identifying method and system
A power battery and model parameter technology, which is applied in the direction of measuring electricity, measuring electric variables, and measuring devices, can solve problems that affect the continuous use of power batteries, require high computing power for power battery management systems, and have many parameters.
Active Publication Date: 2019-01-04
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology
[0004] However, in the methods provided by the prior art, the electrochemical mechanism model often contains multiple diffusion equations, which requires strict boundary conditions, complex models, and many parameters.
The learning process of the black box model is complicated, the selection of battery experiment data samples is difficult, and the generalization of model parameters is poor
The RC network contained in the equivalent circuit model of the battery has too many orders, which requires high computing power of the power battery management system. In addition, in the actual use process, the model parameters of the power battery must be checked every once in a while. Update and calibration, data collection is inconvenient, which affects the continuous use of power batteries and increases maintenance costs
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[0027] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the present invention. Invented some embodiments, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0028] At present, in the prior art, the establishment of a general battery model first determines the battery model structure based on laboratory data, and then performs parameter identification. The data sample feature of this method is relatively single and the amount of data is small. Therefore, in actual application, the battery model The s...
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An embodiment of the present invention provides a power battery model parameter identifying method and system. The method comprises a step of determining a change relationship between each voltage component of a battery total voltage and a battery input current based on a power battery state space model constructed by a subspace identification method, a step of establishing an equivalent circuit model corresponding to each voltage component based on the change relationship between each voltage component and the battery input current, and a step of identifying the parameter value of each circuit element in the equivalent circuit model corresponding to each voltage component. According to the power battery model parameter identifying method and system provided by the embodiment of the present invention, the characteristics of each voltage component constituting a total voltage output are analyzed through a subspace identification method, so the equivalent circuit model structure and component composition of the battery are determined, and the parameter values of each element in a power battery model are accurately identified.
Description
Technical field [0001] The embodiments of the present invention relate to the technical field of power battery system design, and in particular to a method and system for identifying parameters of a power battery model. Background technique [0002] In recent years, as a new type of power source, power batteries have been widely used in manufacturing industries such as electric vehicles, drones, and stratospheric airships. The power battery pack used in the above-mentioned industries is composed of battery cells connected in series, and the number of cells is as many as dozens to hundreds. Compared with a single or several batteries, the power battery pack has a high voltage and a complicated structure. During use, the working current of the power battery has a wide range of changes, rapid changes, and frequent charging and discharging conversions. Therefore, if the battery status parameters are not monitored, the battery is likely to be overcharged, overdischarged, and overheate...
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Inventor 杜晓伟徐国宁李兆杰苗颖高阳刘乾石
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI