On September 9, 2025, Mercedes-Benz officially announced that its EQS, equipped with a solid-state battery prototype, completed a real-world test from Stuttgart, Germany, to Malmö, Sweden, covering the entire 1,205km without recharging, with a remaining range of 137km. This test route, which involved a detour through complex terrain (a 19% increase in range compared to the standard 1,014km), demonstrated the stability and energy density advantages of solid-state batteries under real-world road conditions.
The battery cells, supplied by Factorial Energy in the United States, utilize a sulfide-based solid-state electrolyte, resulting in a 25% increase in energy density compared to traditional lithium-ion batteries.
The floating cell housing design, developed by the Mercedes-Benz F1 Technical Center, uses a pneumatic actuator to adjust expansion and contraction during charge and discharge, extending battery life by over 30%.
|
parameter |
Solid-state battery version |
Traditional lithium-ion version (EQS) |
|
Range |
1205km (measured) |
774km (WLTP) |
|
Battery weight |
Equivalent to traditional batteries |
About 700kg |
|
Fast charging support |
To be announced |
200kW peak |
Technical Milestone: First-ever real-world road test of a solid-state battery over 1,000 kilometers, addressing core challenges such as reduced winter range and charging speed.
Commercialization Progress: Mercedes-Benz CTO Markus Schäfer confirms mass production before 2030, competing with Volkswagen Group's technology strategy.
Policy Alignment: Aligns with the Ministry of Industry and Information Technology's "New Energy Vehicle Industry Development Plan" technical target of achieving a battery energy density of ≥ 400Wh/kg by 2025.
Route Design: Avoided ferry routes and included a mix of mountainous terrain and highways, maintaining an average speed of 85 km/h.
Energy Efficiency: The kinetic energy recovery system effectively increases range in congested areas, resulting in a measured energy consumption as low as 12.8 kWh/100 km.
Low-Temperature Performance: In-vehicle data showed zero battery degradation at 10°C in Sweden, far exceeding the industry average of 40% performance degradation for liquid lithium batteries at -20°C.
