# How do Roll-2-Roll sensors keep coating heads aligned in battery electrode manufacturing?

> In Li-Ion battery electrode coating, the coating must align precisely with the current collector foil. Steering the foil creates stress and wrinkles that cause defects. Instead, Roll-2-Roll Sensors enable coating head chasing: Sensor placement: ODC 96 or similar mounts directly on the coating…

**Last updated:** 2026-10-06

**Source:** https://r2r.tech/resources/faq/how-do-roll-2-roll-sensors-keep-coating-heads-aligned-battery-electrode-manufacturing

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## Question

How do Roll-2-Roll sensors keep coating heads aligned in battery electrode manufacturing?

## Short Answer

The sensor mounts on the coating head carriage, tracking the metal foil edge. As the foil drifts, the coating head chases it—maintaining coating registration without stressing the delicate substrate.

## Detailed Answer

In Li-Ion battery electrode coating, the coating must align precisely with the current collector foil. Steering the foil creates stress and wrinkles that cause defects. Instead, [Roll-2-Roll® Sensors](https://r2r.tech/products/sensors) enable coating head chasing:

- Sensor placement: [ODC 96](https://r2r.tech/products/sensors/odc-96) or similar mounts directly on the coating carriage
- Edge tracking: the sensor images the foil upstream of the coating head, and the controller computes the edge position from each frame
- Dynamic alignment: If the foil drifts, the coating head moves to follow, keeping the bead position repeatable relative to the foil edge

**The benefit:** No mechanical stress on the foil, no wrinkles, no electrode misalignment. This is critical for preventing lithium plating defects in finished cells.

**Category:** Technical

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## About Roll-2-Roll Technologies

Roll-2-Roll Technologies designs and manufactures patented fiber-optic web position sensors and advanced web guiding controllers — the precision measurement and control core of modern roll-to-roll manufacturing. Spun out of Oklahoma State University's Web Handling Research Center and trusted by Fortune 500 medical, battery, and nonwovens manufacturers, our patented sensors work without recalibration, with 0.0635 mm resolution and ±0.127 mm repeatability at line speeds up to 760 m/min — typical customer outcomes are 50%+ less downtime and payback under six months. Headquartered in Stillwater, Oklahoma, our team of PhDs, controls engineers, and industry veterans extends the sensor + controller core into complete web guide systems including stepper-motor-based linear actuators (RLA, BLA, LHS).

- Website: https://r2r.tech
- Phone: +1 (888) 290-3215
- Email: sales@r2r.tech