Electrical Insulation Safety
Pinholes, thin film at sharp edges, cracking or local undercure in insulating powder coatings on battery housings, busbars and liquid-cooling components can reduce withstand voltage, increase leakage current or cause dielectric breakdown. Film-thickness uniformity, edge coverage, mechanical strain and thermal cycling determine long-term insulation reliability.
Formulation Design
- Use a dedicated insulating epoxy system that combines high dielectric strength and volume resistivity with edge coverage and mechanical toughness.
- Define a film-thickness window for the target withstand voltage and geometry instead of relying on excessive film build alone.
Process Control
- Round and clean sharp edges and strengthen pretreatment to prevent metal burrs from piercing the coating.
- Control film-thickness uniformity; where necessary, apply multiple coats and verify intercoat adhesion.
- Complete the cure schedule based on actual part temperature, with focused inspection of thickness transitions, blind holes and shadowed areas.
Validation Focus
- Dielectric withstand voltage
- Insulation resistance
- Dielectric strength
- Withstand voltage after thermal shock