Executive Programs

Workshops

Projects

Blogs

Careers

Student Reviews

More

Informative Articles

Find Jobs

We are Hiring!

All Courses

Choose a category

All Courses

All Courses

29 May 2023

# Modeling a Li-ion Battery Equivalent Circuit

Skill-Lync

The objective of the article is to model the Li-ion battery equivalent circuit in Simulink. This model represents the battery characteristics of its voltage and current.

An equivalent circuit refers to a circuit component to form a specific circuit network to characterize the circuit's operational characteristics. It is important for the analysis of its performance and to discover any scope of further modification of modeling. It is a very useful way of understanding or predicting the operation and behavior of an electrical circuit.

How to get the block from simulink is explained below.

First, open the simulink blank model. The shortcut to get the blocks is to double-click on the blank space of the model window and type the name of the block in the search tab. Also you need to check the path of each block you are choosing.

The blocks and their location in the library browser is given below in the table.

The PS-simulink converter blocks help to connect the simscape block and simulink block.

The 1st order RC equivalent circuit simulink model is shown in fig 1. The controllable voltage (DC voltage source) denotes the open circuit voltage of the lithium-ion battery which usually varies nonlinearly with SOC, R1 denotes the ohmic resistance of the lithium-ion battery which describes the electrolyte resistance and connection resistance of the battery, R2 denotes the polarization resistance (Polarization resistance is the transition resistance between the electrodes and the electrolyte), C denotes polarization capacitance (Polarization capacitors are the ones that have specific positive and negative polarities). The parallel RC network describes the nonlinear polarization response of the lithium-ion battery, and I is positive for discharging and negative for charging.

The voltage and current waveform for the 1st order RC model is shown in fig 2. The voltage is shown as 10V in the graph, because  DC voltage is taken as 10V. The current is calculated and displayed as 91.92A.

The 2nd-order RC equivalent circuit Simulink model is shown in Fig 3. Where Vdc, R1, R2, R3, C, and C1 have the same meanings as in the first-order RC model, except that there are two parallel RC networks to describe the nonlinear polarization response of the lithium-ion battery.

The voltage and current waveform for the 2nd order RC model are shown in Fig 4. The voltage is 10V, as the DC voltage source is given as 10V. The current is calculated and displayed as 91.08A

The value taken in the Simulink model is given below.

• In the first-order RC model, there is no resonance, and there is only a time constant for charging /discharging.
• In the second-order RC model, there is resonance, and the system can oscillate according to the damping of the circuit.

Application:

• Automotive
• Aerospace
• Consumer electronics
• Renewable energy
• Electricity grid

Author

Author

Skill-Lync

Related Blogs

Electric PowerTrain for Two Wheelers

The average vehicle body gives any vehicle its structural integrity, while the electric motor is concerned with the generation of torque or force. The electric motor can be a permanent magnet synchronous motor, brushless dc motor etc.

25 Aug 2022

How To Tune PID Controllers for Converter Feedback

In industrial control applications, a PID controller is a device that regulates temperature, flow, pressure, speed, and other process variables. PID (proportional integral derivative) controllers, which use a control loop feedback mechanism to control process variables, are the most accurate and trustworthy controllers.

27 Aug 2022

Pulse Charging of Lithium Ion Battery

A lithium-ion (Li-ion) battery is a complicated battery technology that uses lithium ions as a key component of its electrochemistry. During a discharge cycle, lithium atoms within the anode are ionized and separated from their electrons.

29 Aug 2022

A Guide on the Dashboard Library Blockset

Dash in your car is your source of information. It basically functions as a control panel that sits in front of the driver and shows numerous controls and instrumentation required for your car to function.

01 Sep 2022

A hybrid vehicle has two power sources for motion within the same vehicle. Basically the hybrid vehicle is split into two types supported the source for propulsion - combustion engine type and Hydrogen power cell.

07 Sep 2022

Author

Skill-Lync

Related Blogs

Electric PowerTrain for Two Wheelers

The average vehicle body gives any vehicle its structural integrity, while the electric motor is concerned with the generation of torque or force. The electric motor can be a permanent magnet synchronous motor, brushless dc motor etc.

25 Aug 2022

How To Tune PID Controllers for Converter Feedback

In industrial control applications, a PID controller is a device that regulates temperature, flow, pressure, speed, and other process variables. PID (proportional integral derivative) controllers, which use a control loop feedback mechanism to control process variables, are the most accurate and trustworthy controllers.

27 Aug 2022

Pulse Charging of Lithium Ion Battery

A lithium-ion (Li-ion) battery is a complicated battery technology that uses lithium ions as a key component of its electrochemistry. During a discharge cycle, lithium atoms within the anode are ionized and separated from their electrons.

29 Aug 2022

A Guide on the Dashboard Library Blockset

Dash in your car is your source of information. It basically functions as a control panel that sits in front of the driver and shows numerous controls and instrumentation required for your car to function.

01 Sep 2022

A hybrid vehicle has two power sources for motion within the same vehicle. Basically the hybrid vehicle is split into two types supported the source for propulsion - combustion engine type and Hydrogen power cell.

07 Sep 2022

Book a Free Demo, now!

Related Courses

Post Graduate Program in Electric Vehicle Design & Development
4.9
513 Hours of content
Electrical Domain
4.7
12 Hours of content
Electrical Domain
Showing 1 of 3 courses