Machine Vision for EV Battery Manufacturing
How Machine Vision Lighting Keeps Every Cell Accounted For
EV battery manufacturing demands more from lighting than almost any other industry. Electrode webs running at meters per second, sub-millimeter defects the human eye can’t reliably catch, mirror-finish foils and near-black coatings that often appear in the same frame, hundreds of welds per pack, and a traceability requirement that follows every cell from raw foil to finished pack — getting the lighting right is what determines whether a vision system delivers or doesn’t.
Each of these challenges maps directly to a specific lighting requirement: technique, wavelength, intensity, beam geometry, and pulse timing. Whether you’re inspecting coated electrode web at full line speed, verifying separator overhang before a cell is sealed, or profiling busbar welds at end of line, the lighting approach changes. Our technical guide breaks down which technique matches each inspection goal.
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Recommended Products
Every battery-line application has unique requirements — from the lighting geometry that reveals the right data to the strobe timing that matches your line speed. The products below represent some of our most popular solutions for EV battery manufacturing, but they’re just a starting point. Contact your sales rep for guidance tailored to your specific inspection challenge.
Line Scan
LCHPX SERIES
The LCHPX Series high-power line scan lights are built for the defining inspection task of battery manufacturing: imaging the coated electrode web at full line speed. Capable of over 800,000 lux, the LCHPX delivers the intensity line-scan cameras need to catch pinholes, streaks, agglomerates, uncoated zones, and edge defects at meters-per-second web speeds. Multiple lens configurations optimize illumination for your working distance, and fan-free passive cooling means no moving parts, less maintenance, and no forced airflow — a meaningful advantage in dry-room and cleanroom environments. The fully enclosed housing mounts with standard T-slot hardware.
Linear
L300G2
The L300G2 linear light pairs an integrated Multi-Drive™ driver — supporting both continuous operation and OverDrive™ strobing up to 390,000 lux — with the flexibility to daisy-chain up to six units in series for coverage across wide electrode webs and inspection zones. Bright-field, dark-field, and direct lighting configurations cover a range of geometries, and SWIR-enabled versions extend the same form factor past the visible band, where electrolyte wetting, fill verification, and moisture contamination become visible.
Backlight
MBL SERIES
The MBL Series mini backlights turn edges into high-contrast silhouettes — exactly what separator overhang verification and non-contact dimensional gauging require. Built-in edge-enhancing technology delivers sharp outlines of round and highly reflective objects, from cylindrical cans to tab edges. With active areas from 25 × 25 mm to 100 × 100 mm, an ultra-slim housing, and output up to 190,000 lux continuous or 550,000 lux in OverDrive™ strobe mode, the MBL fits into tight stacking and winding stations where the inspection has to happen before the cell is sealed.
Dark Field
RM SERIES
The RM Series low-angle mini ring lights provide the grazing, dark-field illumination that makes foreign particles announce themselves — bright signatures against dark electrode surfaces, caught before a metal particle becomes a latent short circuit inside a sealed cell. Available in 75 mm and 140 mm sizes with sealed, IP65-rated aluminum housings and built-in Multi-Drive™ for continuous or OverDrive™ strobe operation. Four-zone models (RM75-4Z and RM140-4Z), paired with the 4ZMD four-channel driver, enable compact photometric stereo setups that separate surface topography from surface appearance — a powerful tool for distinguishing true defects from harmless discoloration.
Diffuse Dome
DDL SERIES
The DDL Series diffuse dome lights solve the glare problem that defines weld and surface inspection in battery production: specular surfaces with specular defects. Cloudy-day illumination from the dome images mirror-finish foils, busbar welds, can seams, and terminal joints flat and even, so cracks, porosity, and spatter produce contrast instead of saturation. Available with 140 mm (DDL-150) and 235 mm (DDL-250) viewing areas, with Multi-Drive™ for continuous or OverDrive™ strobe operation, the DDL also excels at reading codes on dark, curved, or laser-marked cell surfaces — the backbone of cell-level traceability.
3D Structured Light
SXP80G2
Coming soon
The SXP80G2 structured light projector brings direct 3D measurement to the battery line. A projected pattern lets the camera measure height rather than infer it from brightness — quantifying weld bead height, width, undercut, and missing material on every joint regardless of surface reflectivity, and supporting stack height and coating flatness measurements that 2D imaging cannot make. Interchangeable and custom pattern options adapt the projector to the application, and NanoDrive™ technology switches the LEDs fully on within 500 nanoseconds, delivering laser-comparable intensity without laser speckle — ideal for short exposures on moving lines. Launching soon — contact your sales rep for availability.
Beyond Visible Light: SWIR Inspection
Some battery inspection challenges can’t be solved with visible light at all. Shortwave infrared (SWIR), spanning 1,050 to 1,650 nm, reveals what the visible band hides.
Moisture and electrolyte absorb strongly in SWIR, so wetting, fill verification, and moisture contamination become clearly visible where visible light shows little contrast.
Material differentiation — materials that look identical in visible color can separate sharply in SWIR, exposing coating-chemistry differences, contamination, and residue.
Hidden features — some packaging and separator materials become translucent in SWIR, allowing inspection of features that are hidden in visible light.
Matched SWIR LEDs are now available at 1,050, 1,200, 1,450, 1,550, and 1,650 nm in standard machine vision form factors, and SWIR sensor costs have dropped past the old 1-micrometer barrier. But the camera is only half of the system — without matched SWIR illumination, the sensor sits in the dark. Because SWIR applications vary widely — different wavelengths target different materials, and working distances depend on line geometry — these solutions are best specified through direct consultation.
Have an Inspection Challenge We Can Help With?
Battery-line machine vision lighting rarely fits a catalog-shopping workflow. Line speeds, working distances, surface finishes, wavelengths, dry-room constraints, and traceability requirements all interact — and the right answer for one station is often wrong for the next station on the same line.
Our application engineers work directly with cell manufacturers, pack assemblers, integrators, and machine builders to specify lighting for everything from electrode web inspection retrofits to complete end-of-line verification cells. Tell us about your application and we’ll route you to the right specialist.
Coming Soon: Next-Generation Battery Manufacturing Lighting
Smart Vision Lights is launching new lighting solutions — including products designed for the unique demands of high-speed electrode inspection, SWIR-based process verification, and 3D inline metrology. Large-format cells, dry-coated electrodes, and cell-to-pack construction are changing what has to be inspected and how fast, and what’s possible with machine vision lighting is moving with it.
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