Characterising thermal runaway within lithium-ion cells by inducing and monitoring internal short circuits
Characterising thermal runaway within lithium-ion cells by inducing and monitoring internal short circuits
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DOI：
10.1039/c7ee00385d
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发表时间：
2017-06-01
影响因子：
32.5
通讯作者：
Shearing, Paul R.
中科院分区：
文献类型：
--
作者：
Finegan, Donal P.;Darcy, Eric;Shearing, Paul R.
锂离子电池正被用于要求越来越高的应用中，在这些应用中，安全性和可靠性至关重要。热失控是最大的安全隐患，需要充分了解这一点，才能朝着更安全的电池和电池设计迈进。在这里，我们演示了内部短路装置在受控、按需启动热失控方面的应用。通过它的使用，热失控启动的位置和时间是预先确定的，从而可以通过使用每秒2000帧的高速X射线成像来分析18 650个单元内的故障成核和传播。阐明了组件内发生侧壁破裂、电池爆裂和电池间传播等不良现象的原因，并讨论了提高18650电池和电池安全性的措施。
Lithium-ion batteries are being used in increasingly demanding applications where safety and reliability are of utmost importance. Thermal runaway presents the greatest safety hazard, and needs to be fully understood in order to progress towards safer cell and battery designs. Here, we demonstrate the application of an internal short circuiting device for controlled, on-demand, initiation of thermal runaway. Through its use, the location and timing of thermal runaway initiation is pre-determined, allowing analysis of the nucleation and propagation of failure within 18 650 cells through the use of high-speed X-ray imaging at 2000 frames per second. The cause of unfavourable occurrences such as sidewall rupture, cell bursting, and cell-to-cell propagation within modules is elucidated, and steps towards improved safety of 18 650 cells and batteries are discussed.