Vehicle Electrification - October 24, 2013 - 25

RRoW MATERiAl
d vEHiClES

E

lectrified powertrains, systems and
components bring new performance
capabilities, such as greater responsiveness, higher low-speed torque,
weight-out, and significantly improved fuel efficiency. But often these new capabilities
pose challenges. One of the biggest challenges confronting electric (EV) and hybridelectric vehicle (HEV) designers today is how
to manage the high temperatures stemming
from the electrical losses associated with
high-power electronics.
As temperatures increase, performance can
deteriorate. This can result in slower or even
incorrect CPU processing and almost always
reduces component life expectancy. Such reduced performance can occur within two categories: function and fit.
Both function and fit require careful consideration of the different material pathways
leading to effective thermal management and
thermal stability. But while each poses its
own unique set of engineering issues, they
can both often be resolved with one material
technology.

A look at function
Function is typically the first consideration. In
essence it asks, "Will the part continue to
work the way it was designed?" Following
closely is the question of durability. That is,
"How long will the part continue to work to
specification?"

SAE Vehicle Electrification evsae.com

Function is seeing new challenges as
emerging applications call for the use of
higher temperature chips fabricated on advanced semiconductors like silicone carbide
(SiC). But, in all mobility electronics, it is critical to function that heat is efficiently drawn
away from its source. This typically requires
the use of thermally conductive materials to
interface between heat sources and heat
spreaders, such as metal fins, pins, fans, or
other structures that dissipate heat as quickly
as possible into the air.
Thermal interface materials have greatly
proliferated in recent years into a dizzying array of physical forms, such as greases, adhesives, gap fillers, encapsulants, and thermal
pads. Each of these forms may be served by
a broad range of material types, including silicones, epoxies, urethanes, and others.
Each has its own performance profile that
must be considered, which includes elements
such as coefficient of thermal expansion
(CTE), modulus, elongation, strength, and adhesion. Handling characteristics that range
from dispensing requirements and assembly
time to cure time and clamping also come
into play.
As if this were not enough, material selection must also factor in functional performance metrics. These can range from thermal and electrical conductivity, thermal resistance and dielectric properties, as well as
joint movement capabilities, stress stability
when exposed to high temperatures, vibraOctober 24, 2013

25



http://www.evsae.com

Vehicle Electrification - October 24, 2013

Table of Contents for the Digital Edition of Vehicle Electrification - October 24, 2013

Vehicle Electrification - October 24, 2013
Contents
Foreword
What’s on evsae.com
Tech Report
BMW bets big on the electrified future with i3 (video)
High temperatures narrow material choices for electrified vehicles
Upcoming from the editors
Vehicle Electrification - October 24, 2013 - Vehicle Electrification - October 24, 2013
Vehicle Electrification - October 24, 2013 - 1
Vehicle Electrification - October 24, 2013 - Contents
Vehicle Electrification - October 24, 2013 - 3
Vehicle Electrification - October 24, 2013 - Foreword
Vehicle Electrification - October 24, 2013 - 5
Vehicle Electrification - October 24, 2013 - What’s on evsae.com
Vehicle Electrification - October 24, 2013 - 7
Vehicle Electrification - October 24, 2013 - Tech Report
Vehicle Electrification - October 24, 2013 - 9
Vehicle Electrification - October 24, 2013 - 10
Vehicle Electrification - October 24, 2013 - 11
Vehicle Electrification - October 24, 2013 - 12
Vehicle Electrification - October 24, 2013 - 13
Vehicle Electrification - October 24, 2013 - 14
Vehicle Electrification - October 24, 2013 - 15
Vehicle Electrification - October 24, 2013 - BMW bets big on the electrified future with i3 (video)
Vehicle Electrification - October 24, 2013 - 17
Vehicle Electrification - October 24, 2013 - 18
Vehicle Electrification - October 24, 2013 - 19
Vehicle Electrification - October 24, 2013 - 20
Vehicle Electrification - October 24, 2013 - 21
Vehicle Electrification - October 24, 2013 - 22
Vehicle Electrification - October 24, 2013 - 23
Vehicle Electrification - October 24, 2013 - High temperatures narrow material choices for electrified vehicles
Vehicle Electrification - October 24, 2013 - 25
Vehicle Electrification - October 24, 2013 - 26
Vehicle Electrification - October 24, 2013 - 27
Vehicle Electrification - October 24, 2013 - Upcoming from the editors
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https://www.nxtbook.com/nxtbooks/sae/10AEMD0120
https://www.nxtbook.com/nxtbooks/sae/10OFHD0114
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https://www.nxtbook.com/nxtbooks/sae/10AEMD0113
https://www.nxtbook.com/nxtbooks/sae/10AEID0105_v2
https://www.nxtbook.com/nxtbooks/sae/10AEID0105
https://www.nxtbook.com/nxtbooks/sae/09AEMD1223
https://www.nxtbook.com/nxtbooks/sae/09AEMD1209
https://www.nxtbook.com/nxtbooks/sae/AUTODEC09
https://www.nxtbook.com/nxtbooks/sae/09AEMD1125
https://www.nxtbook.com/nxtbooks/sae/09AEMD1111
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https://www.nxtbook.com/nxtbooks/sae/09AEMD1028
https://www.nxtbook.com/nxtbooks/sae/09AEMD1014
https://www.nxtbook.com/nxtbooks/sae/OFHOCT09
https://www.nxtbook.com/nxtbooks/sae/AUTOOCT09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0930
https://www.nxtbook.com/nxtbooks/sae/09AEMD0916
https://www.nxtbook.com/nxtbooks/sae/AUTOSEP09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0902
https://www.nxtbook.com/nxtbooks/sae/09AEMD0819
https://www.nxtbook.com/nxtbooks/sae/OFHAUG09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0805
https://www.nxtbook.com/nxtbooks/sae/AUTOAUG09
https://www.nxtbookmedia.com