Development and evaluation of in-situ instrumentation for cylindrical Li-ion cells using fibre optic sensors

Modeling and simulation of inhomogeneities in a 18650 nickel-rich, silicon-graphite lithium-ion cell during fast charging

“…Cells without multi-tab design can be modied with reference electrodes to measure local potentials and to correlate lithiation levels to the global state of charge (SoC) of the cell [35]. Beside measuring local potentials [36], temperature sensors [37] in the core of the cell or even optical bres with Bragg Grating [38] are implemented in the cell to measure local temperatures such as the core-temperature.…”

Hybrid Thermo‐Electrochemical In Situ Instrumentation for Lithium‐Ion Energy Storage

“…However, not all of the cell has to reach a runaway temperature to cause a chain reaction – localised heat zones, potentially leading to thermal runaways, have to be eliminated and continuously monitored to ensure the safety and longevity of the device in use. This is especially pronounced in high performance systems and currently dictates extensive testing before battery deployment. The proposed distributed thermal monitoring solution offers an easily applicable, high‐sensitivity and low‐impact alternative that can be used across the design, optimisation and real‐life use stages.…”

“…Previously we have successfully deployed fibre optics technology and flexible substrate thermistors to monitor the cell's internal temperature, as well as standalone reference electrodes . Using these sensors fast‐charging was investigated and a five‐fold reduction in commercial cell charging times was achieved .…”

Lithium-Ion Battery State-of-Charge Estimator Based on FBG-Based Strain Sensor and Employing Machine Learning

“…Looking in more detail at optical fiber-based methods, Fiber Bragg gratings (FBGs) have been shown to be capable of measuring both surface strain [3] and temperature [4] in these sorts of batteries. Several different types of battery 'packages' have been studied for this purpose, including coin cells [5,6], pouch cells [7][8][9] and cylindrical cells [10]. The fiber optic sensing approach has thus previously been shown to offer important advantages when compared to the use of conventional electrical sensors [9].…”

“…The fiber optic sensing approach has thus previously been shown to offer important advantages when compared to the use of conventional electrical sensors [9]. Efforts to integrate sensors inside the battery cell have also shown satisfactory results for the better thermal modeling of the internal behavior of Li-Ion batteries [10]. However, this option is only feasible as an aid to modeling and characterization in the laboratory context, as the battery would then not conform to industry standards (rendering it not suitable for use in 'real world' applications).…”