Automotive Engineering - January/February 2020 - 27

EV battery-materials testing

TESTING FEATURE

GETS PHYSICAL

ZwickRoell's automotive center during the firm's recent International Forum for Materials Testing in Ulm, German

Reliable materials-testing methodologies are vital for progress in electric-vehicle
battery development. A leader in the field explains.
By Kami Buchholz

ZWICKROELL

A

lightweight, higher-capacity lithium-ion or Li-blended battery
could speed demand for electric vehicles (EVs) by increasing
the driving range, but progress could be easily sidetracked
without reliable, repeatable testing methods. "In order to improve the technical capabilities of batteries, mechanical testing must
be an integral part of the development process," said Aleksander
Koprivc, automotive industry manager for materials test equipment
supplier ZwickRoell.
Amid a backdrop of dynamic and static materials testing equipment on display at ZwickRoell's campus in Ulm, Germany, Koprivc
and others spoke with Automotive Engineering during the firm's recent 28th International Forum for Materials Testing. The company's
customers include 80% of the world's top automotive suppliers, all
major global automakers as well as several start-up companies. For
those companies involved with eMobility, the quest for better-performing batteries reigns paramount.
"Every R&D department that is serious about developing next-generation batteries should be doing tons of tests on the copper and aluminum foils for the electrodes and cathodes," Koprivc noted. "They
should be doing tons of tests on the different coatings, and they
should be doing tons of tests on the mechanical behavior of the cell."
AUTOMOTIVE ENGINEERING

The ability to predict how a specific material will
react during operating conditions is must-have information, and physical tests are the conduit to obtaining
that data. "Our main message is you need reliable test
results," Koprivc said.
One example that underscores the value of physical
testing relates to the reactions that occur when Li-ion
batteries are being recharged. In simplistic terms, the
cells encounter dramatic stresses from the thermal
expansion that occurs during battery recharging.
While mechanical tests help researchers and engineers
understand how the cell material is likely to perform
during operating conditions, it is just as important to
understand how the material is likely to react during
the production process.
"Let's say the production process is highly automated,
so that means the material will be under stress being
stretched, tempered and coated. There are a lot of
things going on with the material that need to be understood in the R&D stage so that in the vehicle production
application, the battery will be okay," Koprivc said.
January/February 2020 27



Automotive Engineering - January/February 2020

Table of Contents for the Digital Edition of Automotive Engineering - January/February 2020

Automotive Engineering - January/February 2020
Contents
Editorial: GM goes ‘all in’ on EVs
SAE Standards News
Supplier Eye
What We’re Driving
Technology Report
Road Ready
Heat seekers
EV battery-materials testing gets physical
Engineered in plastic
Tremec’s supercar DCT
Product Briefs
Reader Feedback
Companies Mentioned, Ad Index
Q&A
Automotive Engineering - January/February 2020 - Intro
Automotive Engineering - January/February 2020 - Automotive Engineering - January/February 2020
Automotive Engineering - January/February 2020 - Cover2
Automotive Engineering - January/February 2020 - Contents
Automotive Engineering - January/February 2020 - Editorial: GM goes ‘all in’ on EVs
Automotive Engineering - January/February 2020 - 3
Automotive Engineering - January/February 2020 - 4
Automotive Engineering - January/February 2020 - 5
Automotive Engineering - January/February 2020 - SAE Standards News
Automotive Engineering - January/February 2020 - 7
Automotive Engineering - January/February 2020 - Supplier Eye
Automotive Engineering - January/February 2020 - 9
Automotive Engineering - January/February 2020 - What We’re Driving
Automotive Engineering - January/February 2020 - 11
Automotive Engineering - January/February 2020 - Technology Report
Automotive Engineering - January/February 2020 - 13
Automotive Engineering - January/February 2020 - 14
Automotive Engineering - January/February 2020 - 15
Automotive Engineering - January/February 2020 - 16
Automotive Engineering - January/February 2020 - 17
Automotive Engineering - January/February 2020 - Road Ready
Automotive Engineering - January/February 2020 - 19
Automotive Engineering - January/February 2020 - 20
Automotive Engineering - January/February 2020 - 21
Automotive Engineering - January/February 2020 - Heat seekers
Automotive Engineering - January/February 2020 - 23
Automotive Engineering - January/February 2020 - 24
Automotive Engineering - January/February 2020 - 25
Automotive Engineering - January/February 2020 - 26
Automotive Engineering - January/February 2020 - EV battery-materials testing gets physical
Automotive Engineering - January/February 2020 - 28
Automotive Engineering - January/February 2020 - 29
Automotive Engineering - January/February 2020 - Engineered in plastic
Automotive Engineering - January/February 2020 - 31
Automotive Engineering - January/February 2020 - 32
Automotive Engineering - January/February 2020 - 33
Automotive Engineering - January/February 2020 - Tremec’s supercar DCT
Automotive Engineering - January/February 2020 - 35
Automotive Engineering - January/February 2020 - 36
Automotive Engineering - January/February 2020 - Product Briefs
Automotive Engineering - January/February 2020 - Reader Feedback
Automotive Engineering - January/February 2020 - Companies Mentioned, Ad Index
Automotive Engineering - January/February 2020 - Q&A
Automotive Engineering - January/February 2020 - Cover3
Automotive Engineering - January/February 2020 - Cover4
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