NHK Spring EV power module substrate enables efficient heat dissipation in next-generation electric vehicle inverters

On January 15, NHK Spring EV power module substrate technology was announced as a newly developed metal substrate designed for high-performance electric vehicle applications. The solution has been selected by Denso Corporation for use in power modules within EV inverters, marking a major step forward in electrified drivetrain components.
NHK Spring EV power module substrate reaches mass production stage
This development represents the world’s first mass-produced resin-insulated substrate specifically engineered for electrified vehicles. The NHK Spring EV power module substrate combines a high heat-dissipation insulating resin sheet supplied by Sumitomo Bakelite Co. Ltd. with NHK Spring’s proprietary lamination and thick-copper circuit formation technologies.
Thermal performance comparable to ceramic substrates

• Despite replacing traditional ceramic insulation, the NHK Spring EV power module substrate delivers heat dissipation performance on par with ceramic-insulated alternatives.

• At the same time, it improves electrical efficiency by reducing power losses and suppressing electrical noise, which are critical factors in EV inverter reliability.

Improved durability under temperature variation

• By minimizing warpage caused by thermal cycling, the NHK Spring EV power module substrate enhances long-term durability and structural stability, supporting consistent inverter performance across varying operating conditions.