• PDF / 1,180,939 Bytes
• 15 Pages / 439.37 x 666.142 pts Page_size
• 32 Downloads / 165 Views

DOWNLOAD

REPORT

---

Effect of Different Arrangement on Thermal Runaway Characteristics of 18650 Lithium Ion Batteries Under the Typical Pressure in Civil Aviation Transportation Liu Quanyi *, Yi Xiaoying and Han Xu, College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Nanchang Road, Section 4, Guanghan City, Sichuan Province, China Received: 27 September 2019/Accepted: 13 April 2020

Abstract. In order to investigate the thermal runaway mechanism of 18650 lithium ion batteries and the related hazards, an experimental platform for lithium ion battery fire and explosion is designed and built. The effects of different arrangements, including vertical 2 9 2 and vertical 4 9 1, and initial pressure (96 kPa and 61 kPa) on lithium ion battery thermal runaway are studied in this paper. Compared with the results of thermal runaway characteristics with two arrangements, a higher explosion pressure, a larger mass loss, more O2 consumption and more CO and CO2 production are observed of vertical 2 9 2 batteries due to the larger contact area between batteries. The explosion pressure of vertical 4 9 1 batteries decreases gradually with thermal runaway propagation. For vertical 2 9 2 batteries, the explosion pressure of battery C, D is about twice as large as battery A. The intensity of chemical reaction is more violent under 96 kPa which cause a lower onset temperature and a shorter onset time than that under 61 kPa. The thermal runaway propagation hazard can be reduced by decreasing the contact area between batteries. The results could provide useful guidance for the safety of lithium ion battery transportation in civil aviation. Keywords: 18650 Lithium ion battery, Arrangement, Thermal runaway characteristics, Civil aviation safety

1. Introduction Since 1990s, lithium ion batteries have become the preferred charging power source for consumer electronics [1]. The light weight design and high energy have driven great demand for such batteries in devices such as laptops, electric vehicles and mobile phones. Meanwhile, the cardinal number of lithium ion batteries are huge in civil aviation transportation. Compared with other conventional batteries, * Correspondence should be addressed to: Liu Quanyi, E-mail: [email protected]

1

Fire Technology 2020 lithium ion batteries have some special fire hazards. Under abnormal circumstances, the inner chemical material of lithiumion batteries may go through thermal runaway reactions, leading to fire and heat expansion [2]. According to the statistics from Federal Aviation Administration in 2019 [3], about 241 accident involving lithium ion batteries have happened on aviation cargo and passenger baggage since 1991, most of which result from the abrupt thermal runaway of lithium ion batteries causing fire or explosion, which pose a huge safety threat to civil aviation transportation. Due to the high costs of transportation, the batteries are generally transported in large format packs. Once thermal runaway occurs in the batteries, it is easy to trigger the adjacent batteries t