Polymeric hollow fibers: A supercompact cooling of Li-ion cells

Boháček, Jan; Raudenský, Miroslav; Kroulíková, Tereza; Karimi-Sibaki, Ebrahim

doi:10.1016/j.ijthermalsci.2019.106060

Cited by 16 publications

(7 citation statements)

References 26 publications

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“…The measured total enthalpy (25−70 °C) can reach 179.6 J g −1 , close to many advanced PCMs (Figure 4b), such as silicone grease (161.02 J g −1 ), 34 paraffin-expanded graphite/copper foam (75.00 J g −1 ), 35 and paraffin (124.90 J g −1 ). 36 Moreover, the corresponding specific heat is higher than that of most reported coolants, including n-eicosane (2.40 J g −1 K −1 ), 37 Ga 68 In 20 Sn 12 (0.35 J g −1 K −1 ), 38 thermal paste (1.70 J g −1 K −1 ), 6 greases (1.20 J g −1 K −1 ), 39 polydicyclopentadiene (1.40 J g −1 K −1 ), 40 and glycol solution (3.40 J g −1 K −1 ). 41 Thus, the nanocomposites can dissipate 8.8 kJ heat within 25 to 70 °C, resulting in a battery temperature drop of 10.6 °C, generally meeting the thermal management requirements in the battery systems.…”

Section: Resultsmentioning

confidence: 99%

Thermal-Switchable, Trifunctional Ceramic–Hydrogel Nanocomposites Enable Full-Lifecycle Security in Practical Battery Systems

Ben

Ren

et al. 2022

ACS Nano

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Thermal runaway (TR) failures of large-format lithium-ion battery systems related to fires and explosions have become a growing concern. Here, we design a smart ceramic–hydrogel nanocomposite that provides integrated thermal management, cooling, and fire insulation functionalities and enables full-lifecycle security. The glass–ceramic nanobelt sponges exhibit high mechanical flexibility with 80% reversible compressibility and high fatigue resistance, which can firmly couple with the polymer–nanoparticle hydrogels and form thermal-switchable nanocomposites. In the operating mode, the high enthalpy of the nanocomposites enables efficient thermal management, thereby preventing local temperature spikes and overheating under extremely fast charging conditions. In the case of mechanical or thermal abuse, the stored water can be immediately released, leaving behind a highly flexible ceramic matrix with low thermal conductivity (42 mW m–1 K–1 at 200 °C) and high-temperature resistance (up to 1300 °C), thus effectively cooling the TR battery and alleviating the devastating TR propagation. The versatility, self-adaptivity, environmental friendliness, and manufacturing scalability make this material highly attractive for practical safety assurance applications.

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Section: Resultsmentioning

confidence: 99%

Thermal-Switchable, Trifunctional Ceramic–Hydrogel Nanocomposites Enable Full-Lifecycle Security in Practical Battery Systems

Ben

Ren

et al. 2022

ACS Nano

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“…In the present work, a plastic heat exchanger is presented for surface cooling of cylindrical 18650-type Li-ion cells (Figure 1). It is a dramatically improved version of the heat exchanger published in [18,19]. Coolant channels are made of polypropylene hollow fibers [20,21] with an inner diameter of 0.84 mm, frozen permanently in a polydicyclopentadiene housing.…”

Section: Introductionmentioning

confidence: 99%

Polymeric hollow fibers: a modular heat exchanger for thermal management systems of battery modules in electric vehicles

et al. 2022

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The liquid-cooling system based on polymeric hollow fibers (ø1 mm) embedded inside durable polydicyclopentadiene is proposed for thermal management of li-ion cylindrical batteries from their surface. In the present work, a dramatically improved design is presented, eliminating the following drawbacks: I) the thermal resistance of the heat exchanger is minimized by bringing fibers into direct contact with the negative terminal/cylindrical shell, II) the fabrication process (combination of extrusion and rapid injection molding) is significantly simplified and accelerated as the essential component of the heat exchanger is nearly planar, and III) inlet/outlet manifolds were refined to enhance modularization of the cooling system of the whole battery pack. The pressure loss of the heat exchanger is favorably low, about 100 Pa, corresponding to 10 l/min of the coolant circulating in the entire battery pack of a virtual electrical vehicle. The heat exchanger was stacked with 18650-type lithium-ion cells, which were repeatedly charged/discharged. With the coolant inlet temperature of 20 °C and the C-rate of 1 C, the maximum temperature of the cells during cycling was between 26 °C and 22 °C in the given range of flow rates (5–45 ml/min). Temperature spreads were 10 °C and 4 °C.

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“…The use of these HXs for computer cooling was discussed in [ 9 ]. Possible applications in electric vehicles as cooling and heating devices are discussed in [ 10 , 11 ], where the contact cooling of clusters of cylindrical cells was studied experimentally. They demonstrated very high performance and it was discovered that a very uniform constant cell temperature could be maintained.…”

Section: Introductionmentioning

confidence: 99%

Comparison of a Novel Polymeric Hollow Fiber Heat Exchanger and a Commercially Available Metal Automotive Radiator

et al. 2021

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A novel heat exchanger for automotive applications developed by the Heat Transfer and Fluid Flow Laboratory at the Brno University of Technology, Czech Republic, is compared with a conventional commercially available metal radiator. The heat transfer surface of this heat exchanger is composed of polymeric hollow fibers made from polyamide 612 by DuPont (Zytel LC6159). The cross-section of the polymeric radiator is identical to the aluminum radiator (louvered fins on flat tubes) in a Skoda Octavia and measures 720 × 480 mm. The goal of the study is to compare the functionality and performance parameters of both radiators based on the results of tests in a calibrated air wind tunnel. During testing, both heat exchangers were tested in conventional conditions used for car radiators with different air flow and coolant (50% ethylene glycol) rates. The polymeric hollow fiber heat exchanger demonstrated about 20% higher thermal performance for the same air flow. The efficiency of the polymeric radiator was in the range 80–93% and the efficiency of the aluminum radiator was in the range 64–84%. The polymeric radiator is 30% lighter than its conventional metal competitor. Both tested radiators had very similar pressure loss on the liquid side, but the polymeric radiator featured higher air pressure loss.

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Polymeric hollow fibers: A supercompact cooling of Li-ion cells

Cited by 16 publications

References 26 publications

Thermal-Switchable, Trifunctional Ceramic–Hydrogel Nanocomposites Enable Full-Lifecycle Security in Practical Battery Systems

Thermal-Switchable, Trifunctional Ceramic–Hydrogel Nanocomposites Enable Full-Lifecycle Security in Practical Battery Systems

Polymeric hollow fibers: a modular heat exchanger for thermal management systems of battery modules in electric vehicles

Comparison of a Novel Polymeric Hollow Fiber Heat Exchanger and a Commercially Available Metal Automotive Radiator

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