Events

SESSION 1 – Electric Vehicle Battery Characterisation, Modelling and Simulation – HBK Technology Days 2022 Virtual Seminar Series

HBK Technology Days 2022 – Virtual Seminar Series

Session 1: Electric Vehicle Battery Characterisation, Modelling and Simulation

Overview

Understanding and characterising battery performance is critical for electric vehicle development. This learning is established from multiple sources including laboratory testing, real-world vehicle fleets, physics and chemistry simulation models, and statistical and machine learning models.

These presentations describe predictive battery analytics, characterisation of lithium-ion cells and measuring battery capacity fading using force transducers.

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Batteries Power the World – Battery Analytics Unleashes their Full Potential
Dr. Stephan Rohr, Co-CEO & Co-Founder of TWAICE

The change to electromobility continues to pick up speed, ensuring that one component is at the center of attention: the battery. It is both the enabler and Achilles heel of the transition from ICE to EV. While the battery has a significant impact on nearly all relevant vehicle characteristics (such as fast-charging capability, residual values, and safety), it is a highly complex electrochemical system that comes with various challenges in development and operations. TWAICE enables the automotive industry to step up its battery game – generate more value with batteries by simulating before start of production and by enhancing after-sales services with our predictive battery analytics.

Capture Lithium-ion Battery Cell Key Characteristics By Cell Testing & Validation
Dr. Patrick (Peng) Xiao, Jaguar Land Rover | Lead Engineer – Battery cell chemistry

As the evolution of the cell is moving fast forward with advanced chemistry, formats, capturing the key characteristics of the cell’s performance becomes critical to cell integration into the Pack. Those key characteristics include cell’s fundamental performance such as capacity, DCIR, cycle life & storage life as well thermal properties, safeties under extreme use conditions or abuse conditions. A suite of characterization is introduced how Jaguar Land Rover cell team are capturing those key characteristics as the cell testing & validation methods. Those key characteristics are providing a full spectrum of the information of cells’ interfaces in the Pack.

Measuring capacity fading due to charge/discharge cycles using force transducers
Mr. Thomas Kleckers, HBK | Product and Application Manager, Force Transducers

Electric cars play an important role in the decarbonization strategy of many countries. The technology has been improved in the last years, but besides the range of the car, the time required to charge an electric vehicle is also important as shorter charge stops would make them much more attractive to a wider audience.

A shorter time with the same capacity entails operating with higher currents. Current, temperature and number of cycles are the most important factors that influence capacity fading, meaning the decrease of the capacity of a lithium-ion battery.

Traditionally, battery tests are performed by measuring voltage and current. A more innovative method is to measure the force of a lithium-ion pack while charging or discharging processes in a fixed position. Using a suitable load cell, the test can be performed at various temperatures, and long-term tests are possible as well.

The requirements the force transducer must meet are given by the nature of the testing procedure: The long duration requires a low drift, and possible harsh environments make a hermetically sealed load cell necessary. Recent load cells are extremely accurate sensors, but as with every measurement, a certain measurement uncertainty occurs with a battery test as well.

This lecture will discuss the most important technical aspects for choosing a suitable load cell for a “punch cell test”, and you will also learn how to do an easy calculation to get a good estimation of the measurement uncertainty.