NF Thin Film High Voltage Coolant Heater For EV Car or BTMS

NF GROUP  7 kW–15 kW Thick-Film high voltage coolant heater is a compact, high-efficiency electric heating solution designed for automotive thermal management systems. It converts electrical energy into thermal energy to heat ethylene glycol–based coolant, serving dual functions: cabin climate conditioning and low-temperature battery preconditioning in battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs).
The heater employs advanced thick-film heating technology, wherein rare-earth–doped resistive paste is precision screen-printed onto corrosion-resistant stainless steel substrates and thermally cured to form a durable, adherent heating layer. This process enables uniform heat distribution, rapid thermal response, and long-term stability under cyclic thermal loading.

Key technical advantages include:

1. Exceptional Energy Efficiency: Thermal conversion efficiency ≥98.5%, achieved through fully immersed planar heating elements that minimize convective and radiative losses—thereby enhancing system-level energy economy and extending service life.

2. Reduced Operating Temperature & Enhanced Reliability: Maximum surface temperature limited to ≤170°C, significantly lowering thermal stress on adjacent components and improving long-term operational stability under continuous duty cycles.

3. Inherent Electrical Safety: Hermetically separated electrical and coolant chambers—designed with reinforced dielectric barriers and validated per IEC 60335-1 and ISO 6469-3—eliminate risks of electrolytic corrosion, condensation-induced tracking, and insulation breakdown.

4. Leak-Tight Construction: Elimination of mechanical vent valves and adoption of a fully sealed, pressure-rated housing (tested to 5 bar static pressure) ensure robust airtightness and compatibility with closed-loop cooling systems.

5. Simplified Mechanical Architecture: Removal of traditional finned heating plates reduces part count, assembly complexity, and potential fouling points—improving manufacturability and maintenance-free operation.

6. Precision Joining Technology: All critical coolant-path joints are fabricated using automated fiber-laser welding, ensuring zero leakage risk and compliance with ISO 15614-1 welding procedure specifications.

This heater represents a significant advancement in automotive PTC-based thermal systems—setting new benchmarks for power density, functional safety, and integration readiness in next-generation EV architectures.

As a core component of NF GROUP’s thermal management portfolio, the 7–15 kW PTC coolant heater delivers consistent, controllable heating output to support cabin comfort, battery thermal conditioning, and cold-weather drivability—without compromising vehicle range or system reliability.

For more information, you are welcome to contact us directly.