Tech Briefs Magazine - December 2022 - BET6

Proposed Standards and
Methods for Leak Testing
Lithium-Ion Battery Packs
Rapid detection of EV battery pack coolant-system leaks during production operations is
essential. However, industry standards for measuring leak rates for both glycol-based and
refrigerant-based cooling systems currently do not exist.
L
ithium-ion battery systems are an energy source
for a variety of electric-vehicle applications due to
their high energy density and low discharge rates.
Battery packs, whether made of prismatic, cylindrical,
or pouch cells, are cooled by common automotive
thermal management systems.
The rapid detection of battery pack coolant-system leaks
during production operations is essential for meeting necessary
safety and service-life requirements. Industry standards for
measuring leak rates for both glycol-based and refrigerant-based
cooling systems, however, currently do not exist.
This article discusses how leaks in water-glycol cooling circuits
can be detected reliably and quantitatively through detection
of escaping test gas as an indicator of ethylene glycol
leaks and how the test gas leak rates correlate to the liquid
leakage of the cooling liquid. Influencing variables such as
leakage channel diameter, pressure difference, and viscosity
are considered, and go/no-go leak rates are described.
Introduction
In this paper, the tightness requirements that are necessary
in a coolant circuit that is not operated with pure water are
Preparing an
electric-vehicle
battery pack for
final assembly at
Mercedes-Benz's
new battery manufacturing
plant near
Tuscaloosa, AL.
(Image:
Mercedes-Benz)
6
Battery & Electrification Technology, December 2022

Tech Briefs Magazine - December 2022

Table of Contents for the Digital Edition of Tech Briefs Magazine - December 2022

Tech Briefs Magazine - December 2022 - Intro
Tech Briefs Magazine - December 2022 - Sponsor
Tech Briefs Magazine - December 2022 - Cov1
Tech Briefs Magazine - December 2022 - Cov2
Tech Briefs Magazine - December 2022 - 1
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Tech Briefs Magazine - December 2022 - 13b
Tech Briefs Magazine - December 2022 - 12b
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Tech Briefs Magazine - December 2022 - Cov3
Tech Briefs Magazine - December 2022 - Cov4
Tech Briefs Magazine - December 2022 - MDCov1
Tech Briefs Magazine - December 2022 - MDCov2
Tech Briefs Magazine - December 2022 - MD1
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Tech Briefs Magazine - December 2022 - MD20
Tech Briefs Magazine - December 2022 - MDCov3
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Tech Briefs Magazine - December 2022 - BETCov1
Tech Briefs Magazine - December 2022 - BETCov2
Tech Briefs Magazine - December 2022 - BET1
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Tech Briefs Magazine - December 2022 - BET19
Tech Briefs Magazine - December 2022 - BET20
Tech Briefs Magazine - December 2022 - BET21
Tech Briefs Magazine - December 2022 - BET22
Tech Briefs Magazine - December 2022 - BET23
Tech Briefs Magazine - December 2022 - BET24
Tech Briefs Magazine - December 2022 - BET25
Tech Briefs Magazine - December 2022 - BET26
Tech Briefs Magazine - December 2022 - BET27
Tech Briefs Magazine - December 2022 - BET28
Tech Briefs Magazine - December 2022 - BET29
Tech Briefs Magazine - December 2022 - BET30
Tech Briefs Magazine - December 2022 - BET31
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Tech Briefs Magazine - December 2022 - BETCov3
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