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Save the Date: November 10–12, 2020
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The Right Amount of Force: Rework Ability of Gap Fillers in EV Battery Packs

Anurodh Tripathi, PhD  (Senior Scientist, Parker LORD)

Location: Virtual

Date: Tuesday, November 10

Time: 3:30pm - 4:15pm

Pass Type: Virtual Conference Pass (Paid), Virtual Conference Pass + EU (Paid)

Track: Battery Design & Manufacturing

Format: Technical Session

Vault Recording: TBD

Audience Level: All

The two most commonly used thermal interface materials in EV battery packs are gap fillers and thermal gap pads. Parker LORD's research shows that gap fillers outperform thermal pads to achieve lower thermal impedance, as the gap fillers conform to surface roughness before curing. This allows good adhesion of gap fillers which provides mechanical support during operation. However, this also poses a challenge during repair and re-manufacturing. To keep costs down, OEMs are interested in removing and replacing individual modules. The tight assembly of batteries in their housing does not allow easy access for removal, thus, destroying the entire assembly. In this talk, we will discuss how to test and measure vertical pull-off force, the effect of factors such as surface properties (roughness, coating), material properties (silicones vs urethanes) and the testing conditions (pull, rate, bond line thickness) is evaluated on the vertical pull-off stress.

Takeaway

Attendees will learn how to test and measure vertical pull-off force of gap fillers. Factors like surface properties (roughness, coating), material properties (chemistries) and the testing conditions (pull, rate, bond line thickness) are evaluated for vertical pull-off stress. See graph attached for example of surface roughness on pull-off stress.

Intended Audience

OEM and tier supplier battery design engineers, engineers concerned with aftermarket EV battery repair, and anyone with an interest in use of gap fillers in EV battery packs. While it is technical in nature and data will be presented, basic material comparison and introduction of this challenge will be presented.