Enhanced thermal insulation capabilities of SiO2 aerogel composite felts

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Abstract

With the rapid development of new-energy vehicles, lithium-ion batteries (LIBs) have emerged as a critical power source for automobiles. In battery thermal management systems, thermal insulation sheets play a vital role by providing robust support for the safety and performance of batteries. This study fabricates thermal insulation sheets by impregnating silica aerogel into a silica fiber felt (SFF) substrate using the sol-gel method and supercritical drying technology. The integration of silica aerogel significantly reduces the thermal conductivity of the sheets, effectively enhancing the thermal management efficiency, while the SFF offers a solid guarantee for the battery's safety. Here, a range of silicon aerogel composite felts were crafted, employing SFFs with varying compositions (designated as low-content LSFF and high-content HSFF). The results showed that HSFF-75 exhibited the best performance, with a thermal conductivity lowered to 0.018 ± 0.001 W/(m·K), while maintaining good mechanical properties (maximum strain of 31.1 % and maximum stress of 2.3 MPa) and hydrophobicity (water contact angle of 130.5°). Simulation results demonstrate that HSFF-75 material significantly suppresses thermal runaway propagation, validating its protective efficacy for battery systems. Furthermore, the good thermal insulation of HSFF-75 helps reduce heat loss in cold conditions and improve the driving experience in low-temperature environments.

SiO2气凝胶复合毡的增强隔热性能及其缓解动力锂电池热失控的模拟

随着新能源汽车的快速发展，锂离子电池已成为汽车的重要电源。在电池热管理系统中，隔热片通过为电池的安全性和性能提供强大的支持而发挥着至关重要的作用。本研究采用溶胶-凝胶法和超临界干燥技术，将二氧化硅气凝胶浸渍在二氧化硅纤维毡（SFF）衬底中，制备绝热片。硅胶气凝胶的集成显著降低了片材的导热系数，有效提高了热管理效率，同时SFF为电池的安全性提供了坚实的保障。在这里，制作了一系列硅气凝胶复合毡，采用不同成分的sff（指定为低含量的LSFF和高含量的HSFF）。结果表明，HSFF-75表现最佳，导热系数降至0.018 ± 0.001 W/(m·K)，同时保持了良好的力学性能（最大应变为31.1% %，最大应力为2.3 MPa）和疏水性（水接触角为130.5°）。仿真结果表明，HSFF-75材料显著抑制了热失控的传播，验证了其对电池系统的保护效果。此外，HSFF-75良好的隔热性能有助于减少寒冷条件下的热损失，改善低温环境下的驾驶体验。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

网址：Enhanced thermal insulation capabilities of SiO2 aerogel composite felts https://klqsh.com/news/view/191248

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