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Trident™ Application Highlight: Accelerated Performance Validation of Thermal Adhesives for EV Battery Packs

This document highlights the use of the Modified Transient Plane Source (MTPS) method in the measurement of uncured and cured thermal interface materials during R&D formulation development. HB Fullers EV Therm 420 is described as a structural acrylic adhesive with excellent thermal conductivity and strength performance properties across a wide range of temperatures and substrates. It is a two-component mixture specified at a 10:1 volume mix ratio. In its uncured state, the material has an open time of 6-9 minutes, fixture time of 15-20 minutes and a room temperature cure time of 24 hours. In its cured state the material is specified to have a thermal conductivity greater than 1.0 W/mK. 

Figure 1. HB Fuller EV Therm 420/440 used in a cell assembly (https://chargedevs.com/apr-2022-session/stages-of-constructing-the-optimal-battery-module-architechtures-utilizing-innovative-adhesive-and-sealant-solutions)

C-Therm’s MTPS was used to characterize performance in both the uncured and cured states. Due to the mixing requirement of the two-part system, consistency after mixing was assessed over 3 trials. The uncured, freshly mixed material was extruded directly onto the MTPS sensor, and 3 consecutive measurements were taken for each trial (n=3). As shown in figure 2 below, the material exhibited excellent consistency indicating no inhomogeneities were forming during the extrusion/mixing process of the two-components, nor where there any issues related to filler distribution. It should be noted that the curing process had not began to any significant degree during the measurement period.

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