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A detailed explanation of the 450mah 1s lipo battery model

CNHL briefly introduced the equivalent model of the 450mah 1s lipo battery before. Today I will continue to introduce the details of the equivalent model of the 450mah 1s lipo battery. The article will introduce the three models of the 450mah 1s lipo battery: Rint, Thevenin and PNGV , to help you know more about 450mah 1s lipo battery.
Partners who are interested in the equivalent model of the 450mah 1s lipo battery can click the following article to view, which can help you roughly understand the reasons for the establishment of the equivalent model of the 450mah 1s lipo battery:
5600mah 2s lipo battery modeling basics

450mah 1s lipo batteryRint model

The Rint model (internal resistance equivalent model) is a relatively simple model designed by the Idaho National Laboratory in the United States, which only includes a 450mah 1s lipo battery ideal voltage source UOC and a 450mah 1s lipo battery internal resistance Ro. Since the model does not take into account the polarization characteristics of the 450mah 1s lipo battery, the model is less accurate. The internal resistance equivalent model of the lithium 450mah 1s lipo battery can be considered as the simplest equivalent model of the 450mah 1s lipo battery, but due to the complexity of the electrochemical reaction inside the 450mah 1s lipo battery, the ohmic internal resistance inside the 450mah 1s lipo battery is the same as that of the 450mah 1s lipo battery. The open circuit voltage of the 1s lipo battery is also constantly changing. Therefore, the internal resistance equivalent model of lithium 450mah 1s lipo battery often appears in some simple 450mah 1s lipo battery simulation analysis, but it is rarely seen in practical applications.

450mah 1s lipo batteryThevenin model

Compared with the Rint model, the Thevenin model is improved by adding an RC circuit to characterize the polarization effect under the operating condition of the lithium 450mah 1s lipo battery. The Thevenin model can better characterize the dynamic response of the 450mah 1s lipo battery, Ro can represent the instantaneous voltage response of the 450mah 1s lipo battery during charging and discharging, and the RC circuit can reflect the gradual change in the voltage of the 450mah 1s lipo battery during and after charging and discharging.

Because the Thevenin equivalent circuit model is not only simple in structure, but also can meet the simulation requirements, the 450mah 1s lipo battery Thevenin equivalent circuit model is often used in practical applications, and MATLAB/Simulink is used to build the simulation model, and then the simulation is carried out through the parameters identified by the experiment. Parameter setting, and finally compare the experiment and simulation

This model can approximate the external characteristics of the 450mah 1s lipo battery, but since the order of the model is only one order, in practical applications, there is still a large error between the dynamic calculation results of the model and the characteristics of the actual 450mah 1s lipo battery. This model can approximate the external characteristics of the 450mah 1s lipo battery, but since the order of the model is only one order, in practical applications, there is still a large error between the dynamic calculation results of the model and the characteristics of the actual 450mah 1s lipo battery.
The following article also introduces the equivalent model of lithium 450mah 1s lipo battery in detail, which can help you grasp the general direction of the electrical characteristics modeling type:
What are the modeling types of electrical characteristics of 3s lipo battery?

450mah 1s lipo battery PNGV model

The United States Automotive Research Council (USCAR) announced the Partnership for a New Generation of Vehicles (PNGV) in 1993, and the organization published the "PNGV450mah 1s lipo battery Experiment Manual" in 2001 The PNGV standard equivalent circuit model is proposed, and the standard method for parameter identification of the model is proposed in the "Freedom CAR Power Assisted Hybrid Electric Vehicle 450mah 1s lipo battery Test Manual" published in 2003.

The PNGV equivalent circuit model of the lithium 450mah 1s lipo battery contains two capacitors and two resistors. Compared with the RC equivalent circuit model, this resistor model has one more capacitor. The characteristic of this model is that it takes into account the lithium 450mah 1s The OCV of the lipo battery is the error caused by the accumulation of current over time during the charging and discharging process. The PNGV equivalent circuit model contains the open-circuit voltage source UOC, the polarization resistance Rp, the polarization capacitance Cp, and the ohmic internal resistance Ro and capacitance Cb. Since the circuit model covers the characteristics of 450mah 1s lipo battery polarization and ohmic internal resistance, the PNGV equivalent circuit model is more accurate.

The PNGV model is based on Thevenin and adds the consideration of the load current to the 450mah 1s lipo batteryOCV. In this model, UOC is used to represent the ideal open circuit voltage of the 450mah 1s lipo battery, Cb is the capacitance of the 450mah 1s lipo battery (representing the OCV change caused by the accumulation of the load current IL), and Ro is the ohmic internal resistance of the 450mah 1s lipo battery (the load passed through) The current is IL), Rp is the polarization internal resistance of the 450mah 1s lipo battery (the polarization current passing through is Ip), and Cp is the polarization capacitance (representing the polarization voltage Up change caused by the load current IL).
PNGV model is a typical linear lumped parameter circuit, which can be used to predict the terminal voltage change of 450mah 1s lipo battery under the condition of mixed pulse power characteristic (HPPC) pulse load.

When the 450mah 1s lipo battery is discharged, the accumulation of current over time causes the SOC to change, and the open circuit voltage of the 450mah 1s lipo battery also changes, which is reflected in the model as the voltage change on the capacitor. The size of the capacitor not only characterizes the capacity of the 450mah 1s lipo battery, but also characterizes the DC response of the 450mah 1s lipo battery, which makes up for the shortcomings of the Thevenin model. In order to make the curve fitted by the model match the real voltage curve more closely, the improved PNGV model adds a set of RC circuits, which can achieve a better matching degree during the curve fitting process.

In order to more fully express the external characteristics of the 450mah 1s lipo battery, we can continue to optimize on the basis of the above-mentioned typical 450mah 1s lipo battery model, such as self-discharge factors and hysteresis characteristics are expressed in the form of circuits, but this is bound to be Increase the complexity and identification difficulty of the model.
For model selection and model optimization in specific applications, a typical model can be used for parameter identification first, and then targeted improvements can be made according to the difference between the model and the actual situation.
The above is all about the 450mah 1s lipo battery model. I believe that after reading the article, everyone has a good understanding of the three models of 450mah 1s lipo battery Rint, Thevenin and PNGV. If you want to get more 450mah 1s lipo battery information, you can check it out Below:
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Articolo precedente How to choose right lipo battery for your e-flite rc airplane

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