3rd ISLBFS 2023 特邀嘉宾 | Prof. Jennifer Wen

Jennifer Wen

University of Surrey, UK

Title: Numerical simulations of lithium-ion battery thermal runaway, resulting sparks and fire

Venue: Johnson Hall, Howard Johnson Kangda Plaza Qingdao

报告摘要 | Abstract

The presentation will summarise the development, validation, and application of in-house modified version of open-source computational fluid dynamics (CFD) code OpenFOAM for predicting safety related issues for lithium-ion battery (LIB). The presentation also include some experimental investigations which were carried out as part of a joint project. It will be divided into the following sections:

- Thermal induced thermal runaway (TR) 

This section will report the combined numerical and experimental studies carried out by my team to investigate thermal runaway (TR) of large format 21700 cylindrical lithium-ion battery (LIB) induced by different thermal abuse. The cell was treated as a 3-D block with anisotropic thermal conductivities. Paraell laboratory tests and model validation were conducted using Kanthal wire heaters.  The validated model was also used to fill the experimental gaps by predicting the onset temperature for TR in simulated EV-ARC environment, heat generation rate due to different abuse reactions, the influence of heating power and heating arrangement as well as the effect of heat dissipation on TR evolution and the implications for battery thermal management.

·Mechanically induced thermal runaway 

This section will report the combined numerical and experimental studies to characterise 21700 cylindrical lithium-ion battery (LIB) thermal runaway (TR) induced by nail penetration. Both radial and axial penetrations are considered for 4.8 Ah 21700 NMC cell under 100% state of charge. Heat generation from the decomposition of the cell component materials will be analysed. Validation with the current measurements shows promising agreement. The predictions also provide insight on the magnitudes of heat generation due to internal short circuit resistance, decompositions of solid electrolyte interphase layer (SEI), anode, cathode and electrolyte. Parametric studies further quantify the effects of cell internal short circuit resistance, contact resistance between the nail and cell, convective heat transfer coefficient and cell surface emissivity on TR evolution. 

·TR induced fires 

This section will report our efforts to characterize the fire hazard of 4.8 Ah 21700 cylindrical NMC LIBs with the aim was to develop a viable predictive tool for simulating LIB fires. An analytical model has been developed to predict cell LIB internal pressure evolution following vent opening. The model uses the measured cell internal temperature and EV-ARC canister pressure as input data. Its predictions serve as boundary condition in the three-dimensional CFD simulation of TR induced fire. Predictions have also been conducted for an open cluster to assess the likelihood of TR propagation in the absence of cell side rupture. 

嘉宾简介 | Curriculum Vitae

Jennifer Wen is Professor in Energy Resilience at University of Surrey in the UK. She established and currently leads the Fire and Explosion Modelling Group (FMEG), a multidisciplinary research laboratory for both fundamental and applied research into fire and explosion hazards. She is also the Programme Lead for Energy and Environment at the pan university Institute for Sustainability. 

Professor Wen’s team pioneered the development of an electrothermal model for the evolution of lithium-ion battery (LIB) from normal to abuse conditions until thermal runaway in 2015; and subsequently conducted numerical and experimental investigations on the use of phase change material to improve thermal management for LIB cell clusters and fire/deflagration characteristics of high energy density LIBs. In the recently completed LibRIS project led by Jaguar Land Rover, Professor Wen was the Work Package Leader for Modelling. Her team developed models for thermal and mechanically induced thermal runaway as well as the resulting gas and spark ejections and fires. The models have been further used to evaluate mitigation measures and optimize LIB module design. 

Professor Wen is a Fellow of the Institution of Mechanical Engineers. She is Vice-Chairman of the International Association for Fire Safety Science (IAFSS) and Chair of IAFSS Research sub-committee. Professor Wen sits on over a dozen professional and conference organization/scientific committees, two of these are related to the safety of LIB. She is also a member and sub-task Leader for the European Hydrogen Safety Panel established by the Clean Hydrogen Partnership of the European Commission.

ISLBFS 2023 | 特邀嘉宾总览

（点击上方或嘉宾姓名可跳转至相应文章）

清华大学

中国科学院院士

Jennifer Wen 教授

University of Surrey, UK

崔光磊 研究员

中国科学院青岛生物能源与过程研究所

Jonna Hynynen 博士

Research Institutes of Sweden, RISE

王志荣 教授

南京工业大学应急管理学院

Anup Barai 副教授

The University of Warwick, UK

会议赞助

泰思泰克（苏州）检测仪器科技有限公司

缇福机械（苏州）有限公司

杭州仰仪科技有限公司

江苏费尔曼安全科技有限公司

北京点石高科科技有限公司

曼迪匹艾（北京）科技服务有限公司

积益安全技术（山东）有限公司

昆山莫帝斯科燃烧技术仪器有限公司

若有任何疑问及会议赞助等事宜，请联系：

孔得朋 教授

• 电话：[phone]

• Email: [e-mail]

金凯强 副教授

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彭荣琦 会议秘书

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梅文昕 会议秘书

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