Tuesday, April 23, 2024

Graphene-Based Hall Effect Sensor Map Battery Cell Anomalies

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The device gives more detailed and localised insights regarding battery cell behaviour, serving as early warning sign to prevent any failures

Suited for electric vehicle (EV) battery applications for relatively low field environments and ambient temperatures is the GHS01AT graphene Hall sensor by Paragraf. By incorporating magnetic field measurement resolution in a complex magnetic sensor, it can address monitoring tasks that conventional technologies simply cannot solve.

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While analysing the different battery cell chemistry derivatives and form factors under development, the magnetic sensor will be able to get a more detailed and localised (point-to-point) understanding of battery cell behaviour.

Owing to the performance parameters that the GHS01AT delivers, detailed real-time current density (local cell internal resistance) mapping can be carried out with any variations at different locations in the cell during repeated charge/discharge cycles. If hotspots arise, the local mapping of internal cell resistance could provide insights into the physical processes that lead up to their formation. This might highlight early warning signs which could be monitored in service or scanned for during quality control. It may even provide the information required to design and develop battery chemistries that altogether safeguard against the risk of potential failure or thermal runaway.

Moreover, the sensors can also be used to measure the current flow into and out of cells for real-time magnetic field (current) data.

By utilising a graphene monolayer (just 0.34nm thick), the GHS01AT is not affected by the presence of in-plane stray electromagnetic fields that would severely impact the accuracy of alternative sensing mechanisms. The small footprint allows for good spatial resolution.


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