SiC MOSFET modules for integration into advanced EV battery cell cyclers

SemiQ Inc. has begun shipping its SiC MOSFET modules for integration into advanced cell cycling systems that several of the world's leading battery manufacturers use.

In lithium-ion batteries, cell cyclers facilitate the formation of a stable solid electrolyte interphase to allow increased longevity and performance. The systems also enable battery manufacturers perform battery degradation analysis, temperature and stress testing, and check for defects or performance issues.

To undertake these tasks, the cyclers must accurately charge and discharge batteries with high switching frequencies, enabling more precise control of current and voltage to avoid damage from overcharging/discharging. For this function, the MOSFETs must withstand the thermal stress of repeated power cycling, with failure leading to test disruption and inaccurate data. Conversion efficiency is also essential in minimising operational costs.

The company is supplying its GCMX003A120S3B1-N and the GCMX003A120S7B1 QSiC 1200V SiC half-bridge modules for use in 100kW cyclers (10 x 10kW cells with parallel connections).

These high-speed switching MOSFET modules are highly efficient with exceptionally low switching losses, are designed with a reliable body diode, have been tested to over 1350V and implement a rugged design with easy mounting. Each 10kW cell will integrate 12 modules, with 120 per 100kW per cycler.

Dr Timothy Han, president at SemiQ, said: "Reports1 show that the electrification of transportation is among the most important steps that can be taken to reach net zero. For this, the evaluation of battery performance, durability, and efficiency plays a vital role in enabling the development of longer-range, longer-life EV batteries. We're delighted to be working with one of the world's leading cell cyclers and this partnership is testament to the ruggedness and efficiency of our SiC technology."