Early Detection of Li-ion Failure Using Distributed Fiber Optic Sensing
Thu. September 13| 11:00 AM - 11:40 AM | Critical Power Tech Forum
Luna and the University of Texas Arlington have demonstrated a method of detecting the failure of Li-ion battery cells using High Definition Fiber Optic Sensing (HD-FOS). While LI-ion batteries offer many advantages, they suffer from the fact that an internal fault can initiate heating and very quickly trigger a positive feedback loop that results in thermal runaway that can result in severe damage to personnel and equipment. The conditions that cause such adverse reactions can change with different use cases. If the onset of failure is detected early, warnings can be transmitted before the problem escalates, allowing necessary steps to be taken to mitigate risk. The team demonstrated several ways of implementing the HD-FOS technology to include measuring within the cell, on the outside of a single cell, and across the contacts of a pack. Initial testing demonstrated that measuring an uncharacteristic rise in temperature can indicate a failure as much as 30s before the current interrupt device (CID) would normally engage to stop a failure propagation event. This approach has the ability to improve the safety and reliability of Li-ion batteries by providing a continuous monitoring capability, beyond what is currently installed.
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