Stellantis and Factorial Energy Initiate North American On-Road Testing of First All-Solid-State Battery EV

Stellantis Media / Electrek / Autoweek USA

Overview

Stellantis and Factorial Energy have begun on-road testing in North America, integrating Factorial Electrolyte System Technology (FEST) all-solid-state battery cells into a Dodge Charger Daytona development vehicle—a first for automotive ASSB integration in North America. The 77Ah cells achieve an energy density of 375 Wh/kg and a lifespan exceeding 600 cycles, with ultra-fast charging from 15% to 90% in 18 minutes. The battery maintains performance across extreme temperatures (-30°C to 45°C) and delivers up to a 4C discharge rate. This integration leverages a proprietary battery pack architecture designed by Stellantis.

In Depth

Key Findings

Automotive giant Stellantis and solid-state battery technology developer Factorial Energy have announced the commencement of on-road testing in North America, integrating Factorial Electrolyte System Technology (FEST) all-solid-state battery cells into a Dodge Charger Daytona development vehicle. This marks the first automotive integration of solid-state battery technology in North America and the inaugural deployment of solid-state cells in a Stellantis vehicle.

Technical & Clinical Details

• The 77Ah FEST all-solid-state battery cells developed by Factorial achieve a high energy density of 375 Wh/kg and boast a long lifespan exceeding 600 cycles.
• In terms of charging performance, the battery demonstrates ultra-fast charging capability, completing a 15% to 90% charge in just 18 minutes, which significantly enhances the electric vehicle user experience.
• This battery is capable of maintaining stable performance across an extreme temperature range from -30°C to 45°C and supports discharge rates of up to 4C. This broad operational range contributes to its practicality in diverse climatic conditions.
• The integration of the battery pack leveraged an innovative, patented mechanical architecture designed by Stellantis, facilitating sophisticated engineering solutions for the SLTA Large platform.
• Previous demonstrations include Mercedes-Benz successfully achieving over 1,200 km of driving range using Factorial’s cells, underscoring the technology’s reliability and potential.

Background & Context

With the rapid expansion of the electric vehicle (EV) market, improving battery performance—including range, charging time, safety, and cost—has become an urgent priority. Solid-state batteries represent a technology with the potential to fundamentally resolve these challenges faced by conventional liquid-electrolyte lithium-ion batteries, thereby dramatically enhancing the performance of next-generation EVs. Stellantis is committed to accelerating its EV transition through its ‘Dare Forward 2030’ strategy, and its partnership with Factorial is a critical pillar of this strategy.

Strategic Significance & Outlook

The initiation of on-road testing with the Dodge Charger Daytona in North America is a significant milestone towards the commercialization of solid-state battery technology. This testing aims to validate the battery’s performance, safety, and reliability under real-world conditions, and successful outcomes could lead to the widespread adoption of solid-state batteries in Stellantis’ future EV lineup. Factorial Energy’s technology is anticipated to find applications not only in the EV market but also across various industries requiring high-performance batteries, such as defense, aerospace, and robotics. This partnership holds the potential to become a successful example of international collaboration in realizing next-generation mobility.