Thesis Project - 30 Credits - Feasibility Study on Using Electrochemical Impedance Spectroscopy

Thesis Project - 30 Credits – Feasibility Study on Using Electrochemical Impedance Spectroscopy (EIS) for Estimating the States of Li-Ion Batteries

Scania is now undergoing a transformation from being a supplier of trucks, buses and engines to a supplier of complete and sustainable transport solutions. Thesis work is an excellent way to get closer to Scania and build relationships for the future. Many of today's employees began their Scania career with their degree project.

Background:

The electrification transformation of the heavy-duty sector is happening right here, right now as the demand for competitive, truly zero tailpipe emissions, transport solutions increases rapidly. Scania is at the forefront of this green revolution and is making massive investments in battery solutions, for instance setting up a new battery module- and pack manufacturing site in Södertälje.

Objective:

The objective of this master thesis is to perform a feasibility study on using electrochemical impedance spectroscopy (EIS) technique for estimating the states of Li-Ion batteries.

Estimating the states of lithium-ion (Li-ion) batteries is essential for several reasons. Accurate state estimation, including state of charge (SoC) and state of health (SoH), ensures the safe and efficient operation of batterypowered systems. It helps maintain the battery within its operational limits, reducing damage and extending its lifespan. Moreover, precise state estimation is critical for optimizing battery performance, enhancing energy efficiency, and ensuring reliability in applications ranging from electric vehicles to portable electronics. By providing real-time insights into battery conditions, state estimation also supports predictive maintenance, minimizing the risk of unexpected failures and improving overall user experience.

Job description:

The thesis project will be conducted at Scania R&D in Södertälje at EVBCT group responsible for cell and module testing and also in collaboration with other teams that work with Battery software.

The thesis project may be performed in the following parts:

• Perform a comprehensive literature study

• Perform tests on cells under various conditions (Temperature, State of Charge (SoC), and State of Health

(SoH))

• Analyze the test data by fitting it to battery models to extract parameters

• Compare the extracted parameters with that of the parameters extracted using DC methods

• Estimate the states (Temperature, SoC, SoH) of Li-Ion batteries

• Present the results of the thesis project in a comprehensive report and during an oral presentation at

Scania R&D

Education/ Program/ Focus:

The engineering student we are looking for:

• Is at the end of a suitable M.Sc. program

• Has basic knowledge in battery operation and battery testing (Own experience of doing it is meritorious)

• Has basic knowledge with data analysis platforms (Like Matlab, Python)

• Is curious, full of initiative and passionate about problem solving

• Start date for the thesis project: January 2025 (Start date and timeline to be agreed upon between Scania,

the candidate and the academic affiliation)

Take the opportunity to apply for this exciting task that is a multidisciplinary engineering combination of technique development, process flow and product quality assurance.

Contact Persons:

• Fredrik Laurantzon, Team Manager, EVBCT, Tel : +46855350188, Mail : fredrik.laurantzon@scania.com

• Venu Gopal Prathimala, Development Engineer, EVBCT, Tel : +46855351866, Mail : venu-gopal.prathimala@scania.com

Application:

Your application must include a CV, personal letter and transcript of grades

A background check might be conducted for this position. We are conducting interviews continuously and may close the recruitment earlier than the date specified.