Nickel Chromium Etched Heating Grid Plates for EV Battery Thermal Management Packs

Resistance heating grids on this page are etched from nickel-chromium and iron-chromium-aluminium foil for electric vehicle battery thermal management and for compact PTC auxiliary heaters. The heater track is defined by photoresist and etched in a single chemical pass, so a serpentine, parallel or multi-zone layout is produced as one continuous conductor without joints, welds or stamped bridges that would create local hot spots. Trace width is held to ±0.01 mm across the full panel, which keeps the resistance of each heater within ±5% of the design value and gives an even temperature profile across the heated surface.

Foil gauges between 0.05 mm and 1.0 mm are processed, and finished grids are annealed after etching to relieve residual stress and stabilise resistance before the terminals are welded or riveted. Because etch tooling is digital, a change in heating zone shape, wattage or terminal position costs a new artwork file rather than a new die, which shortens the development cycle for battery pack pre-heating plates, camera and LiDAR defrost windows, and mirror or radar heater elements.

• Uniform Resistance Distribution: Trace width tolerance of ±0.01 mm and etched spacing control keep each heater within ±5% of nominal resistance, avoiding the cold bands that cause condensation and uneven warming.
• Fast Thermal Ramp: Thin NiCr 8020 or FeCrAl foil has very low thermal mass, so the heated surface reaches working temperature in seconds with modest power draw from the 12 V or 400 V bus.
• Serpentine and Multi-Zone Layouts: Independent heating zones, series or parallel conductor networks and redundant tracks can be combined on one sheet, with separate terminal pads for each zone.
• Oxidation-Resistant Alloys: NiCr 8020 is rated for continuous duty in air up to about 1100 °C and FeCrAl grades higher still, with stable resistance through repeated thermal cycling.
• Annealed, Burr-Free Circuits: Post-etch annealing stabilises resistance, and the chemical process leaves no burr or sliver that could bridge a track or puncture the insulation layer.
• Heater Integration Options: Terminal tabs, mounting holes, alignment notches, lead frames and polyimide or ceramic insulation coatings are added as part of the same etched and finished part.

The grids serve EV battery pack pre-heating plates, PTC cabin air heaters, diesel cold-start intake heaters, ADAS camera and LiDAR defrost windows, exterior mirror and radar heater films, aerospace de-icing mats and laboratory warming stages. In battery packs the etched heater is usually bonded to an aluminium cold plate or laminated between polyimide films, and the multi-zone layout lets the battery management system energise only the modules that need warming, which reduces energy drawn from the pack in cold weather. The same design approach applies to small appliance heaters and to medical warming plates where repeatable temperature distribution matters more than absolute wattage.

Finished grids are cleaned, annealed and dried, then packed flat between protective sheets in moisture-barrier bags with desiccant, inside export-grade cartons with rigid board reinforcement to prevent bending in transit. Quality control includes incoming foil certification, etched trace width measurement on a vision system, 100% resistance and continuity testing, thermal imaging on sample batches to confirm even heat distribution, and hi-pot testing where insulation is applied. The plant is certified to ISO 9001, ISO 14001 and IATF 16949, and can supply PPAP, IMDS and material declarations for automotive programmes.

Share your target wattage, supply voltage, heated area and terminal position, and our engineers will propose a track layout, foil grade and thickness with a calculated resistance value before any tooling is committed.