Rimac reveals 'groundbreaking' solid-state tech

New batteries and eAxles promise unmatched efficiency and power density; the latter in production next year

By Matt Bird / Monday, 8 September 2025 / Loading comments

Solid-state battery technology has been discussed for a while now as the next big step forward in EV technology, with better density packing more energy into the same amount of space, and permitting much quicker charge times. But thus far it hasn’t meaningfully made the move from theory to production. Now Rimac Technology has revealed its own ‘solid-state solution’, built with Mitsubishi Chemical Group and ProLogium, at the IAA Mobility show.

The advantages seem pretty persuasive, creating a battery platform that is ‘lighter, safer and more energy-dense.’ Moreover, rather than some future ambition, Rimac believes its solid-state offering is ‘the immediate future of high-performance battery systems.’ It can claim that because the new solution actually uses some existing hardware, specifically 46XX Gen2 NMC cells; they can now be packaged and cooled more efficiently, thus improving performance. Rimac says its new layout can combine those 46XX cells with ‘power-dense’ 2170 items with ‘interchangeable cell configurations’, presumably dependent on the requirements of the installation. Maybe a hard one to get truly pumped about on a Monday morning, but given the proliferation of Rimac tech right now, collaborating with everyone from BMW to Aston Martin, the solid-state stuff is definitely worth having an awareness of. Because you're going to be hearing more about it.

Alongside the batteries, Rimac Technology has also shown new electric axles at Munich. Based on the Scalable Powertrain Platform, the claims for the Sinteg 300 and 550 are pretty remarkable: it says power density is now more than 10hp per kilo, with its new rotor design (which is patented) meaning ‘unprecedented torque and power in a package which fits into carry-on luggage’. The new axles will be offered with anything up to 489hp (360kW) for everything from sports cars to SUVs; with that power density factored in, that means less than 50kg for an electric axle of that potency. Ally it to a solid-state battery solution and we’ll have cars back under two tonnes before you know it.

And that really could be sooner than expected, Rimac Technology stating that a version of the 550 - officially the Dual EM EDU 550 eAxle - will go into series production next year for ‘a global OEM.’ Like we said, maybe not as exhilarating as another Nevera racing a Koenigsegg to 250mph and back again, but much more important to Rimac’s future as a tech business. Nurdin Pitarevi?, COO of Rimac Technology, added: "What we're showcasing at IAA represents the convergence of breakthrough innovation and production readiness. These aren't simply concept technologies; they’ve been developed to be production-ready solutions that will power hundreds of thousands of vehicles in the coming years."