Experimental Study on the Explosion and Fire Risks of Mobile Phone Batteries

Abstract

This is an experimental study to analyze the explosion and fire hazards of mobile phone batteries. Using the lithium-ion batteries currently used on smart phone as the experiment samples, the experiments were conducted by overcharging, internal and external short circuit, and thermal shock with the potential of explosion and fire caused by careless use or abnormal conditions. The experiment results showed that, in the case of overcharging and external short circuit, there was no explosion and fire hazard in the normal operation of the protection circuit module (PCM), but there were big risks when the PCM faulted conditions were assumed. In the case of the experiments by internal short circuit and thermal shock, such risks varied depending on a battery charge state. In other words, it could be verified that there were low risks of explosion and fire in a full discharge state, but there were high risks in a full charge state. These experiment results suggest that to minimize the explosion and fire hazards of mobile phone batteries, an alarm device is necessary when the PCM fault occurs. In addition, a solid battery case should be made and safety equipment, such as a cooling device to avoid high temperature, is needed.

Safety Assessment for External Short Circuit of Li-Ion Battery in ESS Application Based on Operation and Environment Factors

“…Specifically, studies conducted by numerous researchers (Zeyu Chen, Ruixin Yang, Ti Dong, etc.) evaluate the characteristics of external short circuits such as voltage, current and temperature data by considering certain ranges of initial SOC and ambient temperature [7][8][9][10][11]. However, the preprocessing temperature, which is the temperature of the battery during the charging operation before the test, is neglected, despite it having a significant influence on the internal resistance of the corresponding battery samples, and the internal resistance is directly related to the external short-circuit current.…”

An Experimental Study on Fire Risks Due to Overcharge and External Heat of ESS Lithium Battery

“…보호회로가 정상작동 할 경우 과충전 및 외부단 락에 대한 보호가 가능하여 화재를 방지할 수 있지만, 내부 단락 및 외부수열에 의한 열 충격은 보호회로와 상관없이 화재로 이어질 수 있다 (6) . 이에 본 연구에서도 기 진행된 휴대폰 배터리의 폭발 및 화재 위험성 연구 (7) 논문을 참고 되면서 전류가 흐르게 되어 리튬배터리 내부 양극과 음극 이 단락상태 (11,12)…”

Analysis of Discharge Characteristics and Fire Risk of Mobile Phone Batteries according to the Concentration of Salt Water

“…리튬-이온 배터리는 가연성 전해질을 포함하고, 에너지 밀도가 높아 고온 환경에 노출되면 스스 로 가열하게 되는 특성이 있다. 리튬-이온 배터리가 다른 물체에 의해 찍히거나, 파손 시 배터리 내부 단락에 의해 폭발 및 열폭주 현상이 발생할 수도 있다 (1)(2)(3)(4) Figure 5와 같이, 배터리 2개 Figure 2. Method for measurement of salt water concentration.…”