Why do we need a thickness measurement sensor for lithium-ion batteries?

Energy storage devices such as lithium-ion batteries play a crucial role in electromobility and energy transition. In order to optimise battery production, sensors are required to monitor the production line, including thickness measurement sensors. But what are the challenges in making reliable thickness measurements?

How does thickness affect lithium ion transport?

Once the thickness of an electrode is increased, transport related limitations become important [3, 4]; the required diffusion length for lithium ion transport extends, resulting in the possibility of reduced utilisation of storage materials at the extremities of the electrode, adjacent to the current collector.

How does quality control affect battery production?

In battery production, one of the key quality control parameters is the thickness (and width) of film and strip materials, wet layers and electrode coatings. These require sensors that measure thickness reliably as the material is being processed (in-line), helping to optimise production yields while minimising waste.

How do I choose a suitable non-contact thickness measurement system?

A key factor to consider when selecting a suitable system from a supplier is to understand the combined real-world errors that can occur when using a non-contact thickness measurement system and how these errors can be eliminated or compensated for.

How do we measure Sei thickness evolution?

An effective measure of SEI thickness evolution is put forward based on the aforementioned depth-profiles, particularly on C / F for the BOL and EOL states, respectively. In Section 4, the major findings are summarized with some concluding remarks.

What is a lithium ion battery mesh?

The mesh then forms the basis for a highly coupled, multiphysics simulation, and for lithium-ion batteries this usually comprises electrochemistry and diffusive transport, as well as thermal and mechanical behaviour in some cases .