Thermal-Runaway Propagation over a Linear Cylindrical Battery Module

Huichang Niu, Caixing Chen, Dan Ji, Lei Li, Zhao Li, Yanhui Liu, Xinyan Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

Thermal-runaway propagation in battery systems can escalate the battery fire hazard and pose a severe threat to global users. In this work, the thermal-runaway propagation over 18650 cylindrical lithium-ion battery was tested in the linear-arranged module with a 3-mm gap. State of charge (SOCs) from 30% to 100%, ambient temperatures from 20°C to 70°C, and three tab-connection methods were investigated. Results indicate that the battery thermal-runaway propagation speed was about 0.35 ± 0.15 #/min, which increased with SOC and ambient temperature. The critical surface temperature of thermal runaway ranged from 209°C to 245°C, which increased with ambient temperature while decreased with SOC. Compared to the open-circuit module, the flat tab connection could cause an external short circuit to accelerate the thermal-runaway propagation, and the non-flat tab connection was more likely to trigger an explosion. A heat transfer analysis was proposed to qualitatively explain the speed and limiting conditions of thermal-runaway propagation, as well as the influence of SOC, ambient temperature, and tab connection. This work reveals the thermal-runaway propagation characteristics under well-controlled environments, which could provide scientific guidelines to improve the safety of the battery module and reduce battery fire hazards.

Original languageEnglish
JournalFire Technology
DOIs
Publication statusAccepted/In press - 1 Jan 2020

Keywords

  • 18650 battery
  • Critical temperature
  • Lithium-ion battery
  • Propagation speed
  • Thermal runaway

ASJC Scopus subject areas

  • Materials Science(all)
  • Safety, Risk, Reliability and Quality

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