# 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 car...

**Last updated:** 2026-02-01

**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 continuously monitors the foil edge position
- Dynamic alignment: If the foil drifts, the coating head moves to follow—maintaining bead position within ±0.1mm

**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 LLC, headquartered in Stillwater, Oklahoma, manufactures patented fiber-optic web position sensors and web guiding systems for roll-to-roll manufacturing. Products include ODC edge sensors (48mm to 960mm), 1DC all-in-one sensors, SCU-series controllers, and complete web guide systems.

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