What have ProLogium and OPmobility agreed to do?

ProLogium and OPmobility have signed a Memorandum of Understanding to jointly develop solid-state battery modules and packs for electric vehicles. In the first phase, ProLogium supplies cells for electrical performance testing and OPmobility designs, develops and manufactures the modules. The shared goal is a battery module solution that OEMs can adopt for future EV platforms.

What is a solid-state battery module?

A solid-state battery module is an assembly of solid-state battery cells packaged together with electrical connections, thermal management and structural housing to form a unit that can be integrated into a vehicle battery pack. Unlike conventional lithium-ion modules, solid-state modules use a solid electrolyte instead of a liquid one, which can improve energy density and safety.

What performance does ProLogium claim for its solid-state battery cells?

ProLogium reports its superfluidized all-inorganic lithium ceramic battery reaches 900 Wh/L volumetric energy density and 380 Wh/kg gravimetric energy density. The company also reports charging from 5 to 80 percent in roughly 6.4 minutes, a cycle life exceeding 1,200 cycles, and over 95 percent discharge performance at minus 20 degrees Celsius. These are cell-level figures disclosed by ProLogium and not yet verified at module or pack level.

OPmobility is a French automotive supplier and world leader in sustainable mobility. Its C-Power business group develops and manufactures battery systems and electrification solutions for passenger vehicles, commercial vehicles and other mobility applications. The company works with global automotive OEMs across multiple vehicle platforms.

ProLogium is a Taiwan-based solid-state battery developer and manufacturer founded in 2006. It holds over 1,100 global patents and operates a GWh-class gigafactory in Taoyuan, Taiwan. The company describes itself as the only manufacturer able to publicly demonstrate a solid-state battery mass-production line, having shipped more than 800,000 cells to date.

Why does solid-state battery module integration matter for EVs?

Cell-level performance does not automatically translate to finished modules and packs. Engineering solid-state cells into vehicle-ready modules introduces challenges around thermal management, mechanical design, electrical interconnects and manufacturability. The ProLogium and OPmobility collaboration is specifically designed to validate whether cell-level advantages in energy density, fast charging and low-temperature performance survive the transition to module and pack level.

When will solid-state battery modules be available for EVs?

Neither ProLogium nor OPmobility has set a timeline for module deliveries under this agreement. The collaboration is currently at the evaluation and testing phase. ProLogium's Dunkirk gigafactory in France is expected to begin ramp-up between Q4 2028 and Q1 2029, with formal mass production and deliveries from Q2 2029.

How does ProLogium's superfluidized all-inorganic electrolyte differ from other solid-state chemistries?

ProLogium's superfluidized all-inorganic solid-state electrolyte combines an all-ceramic separator and an all-silicon anode. The company states this architecture is non-flammable, does not require high external pressure to maintain performance, and achieves ionic conductivity of 57 mS/cm at room temperature. ProLogium contrasts it with sulfide-based solid-state electrolytes, which it says release flammable sulphur vapours under high-temperature oxidative conditions. These claims are made by ProLogium and have not been independently assessed in this article.

What is OPmobility's strategic rationale for a cell-agnostic battery module approach?

OPmobility C-Power president Youssef Souiba described the MoU as aligned with the group's strategy to design and assemble battery packs regardless of the cell technology used. This positions OPmobility as a system integrator able to work across lithium-ion and solid-state chemistries, reducing dependency on any single cell supplier and widening its addressable OEM customer base.

What test protocols govern the first phase of the ProLogium and OPmobility collaboration?

Under the MoU, ProLogium will supply solid-state battery cells to OPmobility for electrical performance testing in accordance with testing protocols agreed by ProLogium in advance. The two companies are also aligning on common engineering workflows to accelerate system-level integration evaluation and help both parties identify key parameters and challenges earlier in the development process.

ProLogium and OPmobility target solid-state battery modules for EVs

Category: Automotive, Batteries, Investment & Finance, Testing & Validation

June 10, 2026

ProLogium solid-state lithium ceramic battery cells arranged for module integration evaluation, as part of the ProLogium and OPmobility MoU for EV applications.

ProLogium solid-state lithium ceramic cells will undergo electrical performance testing by OPmobility under the terms of the MoU

(Image courtesy of ProLogium)

ProLogium and OPmobility have signed a memorandum of understanding to jointly develop solid-state battery modules for electric vehicles. The agreement takes ProLogium’s lithium ceramic cells into module and pack integration under a phased evaluation programme, with OEM adoption as the shared objective. The collaboration is designed to validate whether cell-level performance translates to module and pack level, with OEM evaluation as the stated end point.

What the solid-state battery module collaboration covers

In the first phase, ProLogium will supply cells to OPmobility for electrical performance testing under protocols ProLogium sets in advance. OPmobility then takes on the design, development and manufacturing of modules built around those cells. The shared target is a module solution that OEMs can adopt for future EV platforms.

Both firms also plan to align test protocols and engineering workflows. By converging early, they aim to flag integration challenges sooner and make later OEM evaluation more efficient. The companies note that any cooperation will sit within applicable competition law.

OPmobility runs the battery work through its C-Power business group, led by Executive Vice President Youssef Souiba.

Cell metrics behind the solid-state battery module

ProLogium reports its superfluidized all-inorganic lithium ceramic battery reaches 900 Wh/L volumetric and 380 Wh/kg gravimetric energy density. The company also reports charging from 5 to 80 percent in roughly 6.4 minutes. For durability, it cites more than 1,200 cycles and over 95 percent discharge performance at minus 20 degrees Celsius.

These figures describe cell behaviour, not finished modules. The collaboration therefore centres on validating whether those advantages survive once cells are engineered into modules and packs. ProLogium positions itself as the only company able to publicly demonstrate a solid-state battery mass-production line, having shipped more than 800,000 cells to date.

What comes next for the partnership

Neither company has set a timeline for module deliveries. The next steps run through agreed test protocols and joint module development, with OEM adoption as the stated goal. ProLogium founder and CEO Vincent Yang framed system integration and validation – from cells through modules to packs – as the decisive factor for solid-state batteries reaching the market.

OPmobility C-Power president Youssef Souiba said the partnership strengthens the group’s ability to anticipate what global automakers need, and described it as aligned with OPmobility’s strategy to design and assemble battery packs regardless of cell technology. OPmobility CEO Félicie Burelle called the agreement a milestone in the group’s electrification ambitions, coming shortly after the company announced a battery pack supply award for a global OEM covering passenger cars in the US market.

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