Methods for Durability Testing and Lifetime Estimation of Thermal Interface Materials in Batteries

Stadler, Ralf; Maurer, Arno

doi:10.3390/batteries5010034

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…For a varying junction temperature due to changes in P loss and T amb , (2) will yield a varying acceleration factor. This distribution of acceleration factors is known as a stress collective [10] and an average acceleration factor can be calculated by a weighted average (3).…”

Section: Lifetime Estimationmentioning

confidence: 99%

“…In this work, we address the first of those challenges and describe a framework for instrumenting and autonomously measuring inverter component stress for a variety of different advanced inverter operating conditions (Figure 1). We demonstrate how those measurements (Step 1) can then be coupled with appropriate advanced inverter operating conditions (either real or expected, Step 2) to create a stress collective (Step 3) [10]. This stress collective can then be combined with an appropriate component lifetime model (Step 4) to determine an effective reduction in useful life of the inverter, due to advanced inverter functionality (Step 5).…”

Section: Introductionmentioning

confidence: 99%

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Automating Component-Level Stress Measurements for Inverter Reliability Estimation

et al. 2022

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In the near future, grid operators are expected to regularly use advanced distributed energy resource (DER) functions, defined in IEEE 1547-2018, to perform a range of grid-support operations. Many of these functions adjust the active and reactive power of the device through commanded or autonomous operating modes which induce new stresses on the power electronics components. In this work, an experimental and theoretical framework is introduced which couples laboratory-measured component stress with advanced inverter functionality and derives a reduction in useful lifetime based on an applicable reliability model. Multiple DER devices were instrumented to calculate the additional component stress under multiple reactive power setpoints to estimate associated DER lifetime reductions. A clear increase in switch loss was demonstrated as a function of irradiance level and power factor. This is replicated in the system-level efficiency measurements, although magnitudes were different—suggesting other loss mechanisms exist. Using an approximate Arrhenius thermal model for the switches, the experimental data indicate a lifetime reduction of 1.5% when operating the inverter at 0.85 PF—compared to unity PF—assuming the DER failure mechanism thermally driven within the H-bridge. If other failure mechanisms are discovered for a set of power electronics devices, this testing and calculation framework can easily be tailored to those failure mechanisms.

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Section: Lifetime Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Automating Component-Level Stress Measurements for Inverter Reliability Estimation

et al. 2022

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“…The CNNS/PI composites show a greatly increased in-plane thermal conductivity of 2.04 W/m·K at 20 wt % CNNS loading while simultaneously maintaining superior electrical insulation property. However, CNNS/PI composites still have extremely low through-plane thermal conductivity (0.32 W/m·K), which poses a great limitation on the actual applications where isotropic thermal conductivity of TIMs is required, such as underfills for flip-chip packaging , and a power battery thermal management system (BTMS). , Therefore, a facile and effective strategy for achieving a high isotropic thermal conductivity but retaining excellent electrical insulation on CNNS/polymer composites is very necessary.…”

Section: Introductionmentioning

confidence: 99%

“…However, CNNS/PI composites still have extremely low through-plane thermal conductivity (0.32 W/m• K), which poses a great limitation on the actual applications where isotropic thermal conductivity of TIMs is required, such as underfills for flip-chip packaging 20,21 and a power battery thermal management system (BTMS). 22,23 Therefore, a facile and effective strategy for achieving a high isotropic thermal conductivity but retaining excellent electrical insulation on CNNS/polymer composites is very necessary. Constructing a three-dimensional (3D) thermally conductive network in a polymer matrix has been proven to be one of the most efficient strategies to enhance the heat transfer efficiency of TIMs.…”

Section: Introductionmentioning

confidence: 99%

Facile and Scalable Strategy for Fabricating Highly Thermally Conductive Epoxy Composites Utilizing 3D Graphitic Carbon Nitride Nanosheet Skeleton

Wang

Hou

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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The application of high-performance thermal interface materials (TIMs) for thermal management is commonly used to tackle the problem of heat accumulation, which influences the performance and reliability of microelectronic devices. Herein, a novel three-dimensional (3D) carbon nitride nanosheet (CNNS)/epoxy composite with high thermal conductivity was developed by introducing 3D CNNS skeleton fillers prepared by a facile and scalable strategy assisted by a salt template. Benefiting from the continuous heat transfer pathways formed in the CNNS skeleton, 17.0 wt % 3D CNNS/epoxy composites achieve a superior thermal conductivity of 1.27 W/m•K, which is 6.35 and 1.57 times higher than those of epoxy resin and convention CNNS/epoxy, respectively. With the aid of theoretical model analysis and finite element simulation, the pronounced enhancement effect of the 3D CNNS skeleton on the thermal conductivity of epoxy composites is found to be attributed to the continuous 3D CNNS thermally conductive network, the diminished CNNS-CNNS interfacial thermal resistance, and the effective interfacial interactions between epoxy and CNNS. In addition, the 3D CNNS/epoxy composites possess high electrical insulation and desirable mechanical strength. Therefore, 3D CNNS/epoxy composites are promising TIMs for advanced electronic thermal management.

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“…Mainly, there are two models present in the literature on the life estimation of an elastomer, namely, Arrhenius and Williams–Landel–Ferry (WLF) models . However, a widely used method to predict the shelf life is through kinetic modeling based on the Arrhenius equation. − In order to simulate the situation, the products are normally stored at a higher temperature than room temperature under clearly defined controlled conditions. Upon completion of the aging test, the physical property of the products is measured, usually at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Gloves for Waste Management Post-COVID-19 Outbreak: A Shelf-Life Prediction

et al. 2020

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With increased awareness on the importance of gloves arising from the COVID-19 pandemic, people are expected to continue using them even after the pandemic recedes. This scenario in a way increased the rubber solid waste disposal problem; therefore, the production of biodegradable gloves may be an option to overcome this problem. However, the need to study the shelf life of biodegradable gloves is crucial before commercialization. There are well-established models to address the failure properties of gloves as stated in the American Society for Testing and Material (ASTM) D7160. In this study, polysaccharide-based material-filled natural rubber latex (PFNRL) gloves, which are biodegradable gloves, were subjected to an accelerated aging process at different temperatures of 50–80 °C for 1–120 days. Prediction models based on Arrhenius and shift factors were used to estimate the shelf life of the PFNRL gloves. Based on the results obtained, the estimated time for the PFNRL gloves to retain 75% of their tensile strength at shelf temperature (30 °C) based on Arrhenius and shift factor models was 2.8 years. Verification on the activation energy based on the shift factor model indicated that the shelf life of PFNRL gloves is 2.9 years, which is only a 3.6% difference. The value obtained is aligned with the requirement in accordance with ASTM D7160, which states that only up to a maximum of 3 years’ shelf life is allowed for the gloves under accelerated aging conditions.

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Methods for Durability Testing and Lifetime Estimation of Thermal Interface Materials in Batteries

Cited by 10 publications

References 20 publications

Automating Component-Level Stress Measurements for Inverter Reliability Estimation

Automating Component-Level Stress Measurements for Inverter Reliability Estimation

Facile and Scalable Strategy for Fabricating Highly Thermally Conductive Epoxy Composites Utilizing 3D Graphitic Carbon Nitride Nanosheet Skeleton

Biodegradable Gloves for Waste Management Post-COVID-19 Outbreak: A Shelf-Life Prediction

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