ProLogium has moved its European expansion from planning into construction. In February 2026, the Taiwanese battery developer broke ground on its Dunkirk gigafactory, beginning a project intended to bring its fourth-generation lithium ceramic batteries into larger-scale production in France. The facility will serve as the company’s first major manufacturing base in Europe and will test whether its battery technology can be produced consistently at substantially greater volume.
ProLogium’s roadmap to commercial scale
The expansion will take place in stages. ProLogium’s current roadmap targets an initial 0.8 GWh of Gen4 capacity in 2028, followed by a production ramp in 2029, full operation at 4 GWh in 2030, and total capacity of 12 GWh by 2032. The site also includes land for further expansion if customer demand grows.
Financing is another key part of the scale-up. On May 27, 2026, ProLogium and Translational Development Acquisition Corp. announced a proposed business combination that values ProLogium at approximately $3.8 billion on a pre-money, net cash-free basis. The transaction materials identify Gen4 production and the Dunkirk factory among the intended uses of the capital.
From Taiwan Production to a European Gigafactory
The Dunkirk project builds on ProLogium’s existing manufacturing experience rather than starting from scratch. ProLogium says it reached commercial-scale manufacturing for solid-state batteries in 2013 and delivered a solid-state battery demonstration vehicle with ENOVATE Motor in 2019. The company also reports that cumulative shipments have surpassed 2.4 million cells, including more than 800,000 third-generation cells produced at its GWh-class Taoke factory in Taoyuan, which opened in 2024. Dunkirk therefore presents a different challenge: transferring that experience to a newer battery generation, a larger facility, and customers in the European market.
ProLogium’s core technology materials describe a platform that combines ceramic separator technology, inorganic electrolytes, electrode structures, cell architectures, and automated production processes. The company also highlights coating, lamination, and other steps used to build layered battery structures.
The patents below show how ProLogium has worked on the battery at three connected levels: the materials inside the cell, the way electrochemical elements are organized, and the manufacturing process used to join thin battery-related layers.
How ProLogium’s patents address the battery scale-up challenge
The three featured patents follow the same progression. The first addresses the separator that keeps the electrodes apart. The second organizes several electricity-supply elements inside one battery package. The third moves into production equipment, where thin films must be bonded continuously without wrinkles.
Keeping the electrodes apart without blocking ion movement
A separator has to perform two jobs at the same time. It must prevent the positive and negative electrodes from touching, which could cause an internal short circuit, while still allowing ions to travel between them during charging and discharging. Polymer separators can lose mechanical strength or insulating performance under demanding thermal conditions. For a battery developer, the challenge is therefore to improve heat resistance without creating a barrier that slows ion movement.
U.S. Patent No. 11,205,823 addresses the need to improve the separator’s thermal stability and electrical insulation without obstructing the movement of ions required during charging and discharging. Passive ceramic particles account for more than 40% of the separator by mass and provide much of its physical framework. Ion-conductive material is placed between and around those particles. It includes a polymer base, an additive that helps dissociate metal salts, and an ion-supplying material.
The design assigns the separator’s two functions to different parts of the structure. The ceramic particles strengthen the framework and support electrical insulation, while the material between them creates paths for metal ions to move through the separator. The specification also describes shell layers and bridging portions around adjacent particles, giving the ion-conductive material a continuous route through the ceramic network.
This architecture becomes a manufacturing issue when it has to be reproduced across large sheets of material. Particle distribution, layer thickness, and the continuity of the ion-conducting paths all have to remain within an acceptable range from one cell to the next. The patent does not describe how Dunkirk will manufacture its separators, but it shows why separator design sits at the intersection of battery safety, electrochemical performance, and production consistency.
The patent, titled “Ceramic Separator,” was filed on September 30, 2020, and granted on December 21, 2021. The inventors listed are Szu-Nan (Vincent) Yang and Dmitry Belov.
Building higher voltage and capacity inside one battery package
Battery systems reach their required output by connecting electrochemical elements in different ways. A series connection raises voltage, while a parallel connection raises capacity. Conventional multi-cell arrangements often rely on external wires, leads, or metal bars, which take up space and add electrical resistance. Another difficulty can arise when elements connected in series share an electrolyte system, because the higher combined voltage may place additional stress on that electrolyte.
U.S. Patent No. 11,444,359 brings several electricity-supply elements into one package and connects them internally through a combination of series and parallel arrangements. Each element remains an independent module with its own sealed electrolyte system. The electrolyte does not circulate between neighboring elements; instead, electrical charge passes through connections between their current collectors.
By moving more of the electrical connection inside the package, the design can combine voltage and capacity while reducing some of the hardware used outside conventional cells. The patent also increases the contact area between current collectors, which is intended to reduce resistance and make better use of the available space.
The invention is not limited to one solid-state chemistry. Its claims allow the electrolyte to be gel, liquid, solid, or a combination of those forms. Its value to the ProLogium story is therefore architectural rather than chemical: it shows how the company has tried to integrate independently sealed electrochemical elements into a more compact battery structure.
The patent, titled “Composite Battery Cell,” was filed on September 19, 2018, and granted on September 13, 2022. The inventor listed is Szu-Nan (Vincent) Yang.
Bonding thin battery films without wrinkles
Thin films are difficult to bond evenly when one layer already carries raised components. The areas beneath those components are supported, but the spaces between them can sag or wrinkle as the material passes through rollers. Correcting those defects may require slowing or stopping the line, manually flattening the film, and repeating part of the process.
U.S. Patent No. 12,679,045 places a deformable roller opposite a harder bonding roller. As the films pass between them, the softer outer layer compresses around the raised elements and into the gaps. This supports the thinner film more evenly while the two layers are pressed together.
The battery connection is stated directly in the patent. Positive active-material layers, negative active-material layers, and glue frames are listed as examples of the raised elements carried on the film. Figure 4B shows the mechanism in cross-section: the deformable outer layer presses into the uneven spaces around those structures so that the unsupported portions of the film remain flatter during bonding.
The process is designed for continuous film bonding, which makes it especially relevant to manufacturing scale. A production line can only increase output if it handles thin layered materials repeatedly without creating frequent wrinkles, stoppages, or rework. The patent does not establish that this particular roller system will be installed at Dunkirk. It does show ProLogium protecting a battery-related production method aimed at improving continuity and film quality in a roll-to-roll process.
The patent, titled “System for Bonding Films and Method for Preparing Composite Film Using the Same,” was filed on August 22, 2024, and granted on July 14, 2026. The inventors listed are Jhi-Jhong Lin, Chia-Ming Lin, and Che-Ming Kuo.
Legal representation for the three patents was provided by Rabin & Berdo, P.C.
ProLogium: Patenting Activity
Patent publication activity began to accelerate in 2018, after ProLogium moved its G1 line into fully automated production in 2017. The rise continued through 2020 and 2021 as the company introduced BiPolar+ in 2018 and MAB technology in 2019, then completed a 0.5 GWh G2 line in 2020. These milestones place the portfolio’s expansion alongside a period of increasing automation and production capacity.
Patent activity remained high through 2022 and 2023 as ProLogium paired cell development with larger commercial and supply-chain commitments. In 2022, the company announced a technology cooperation agreement with Mercedes-Benz and a materials development and supply agreement with POSCO Holdings. In 2023, it selected Dunkirk for its European gigafactory. The sequence suggests that sustained patenting accompanied a broader shift toward customer validation, materials planning, and preparation for mass production.
ProLogium: Top Technology Areas
From 2016 through 2026, H01M, which covers batteries and electrochemical cells, dominated ProLogium’s portfolio. That concentration is consistent with the company’s work on separators, electrodes, electrolytes, cell structures, and related components. B32B, covering layered products and laminates, and A62C, covering fire-fighting and fire suppression, formed the next most visible areas. Together, these CPCs reflect two practical requirements in ProLogium’s solid-state battery platform: building thin material stacks accurately and managing thermal or fire risk.
Manufacturing-related CPCs form a second layer around the core battery portfolio. B29C covers shaping and joining materials, while B65H covers the handling of sheets, films, and webs, both of which align with ProLogium’s coating, lamination, and roll-to-roll processes. G01N, H01B, H02J, and B65D extend into testing, conductive and insulating materials, power management, and packaging. Together, these classifications show a portfolio that reaches beyond cell chemistry into the processes and supporting systems needed to manufacture, test, connect, and package batteries consistently.
ProLogium: Top Law Firms
From 2016 through 2026, ProLogium’s identifiable patent representatives show a filing strategy organized by market. Cabinet Chaillot appears mainly in European records, while KingSound & Partners and Huahe IP Limited support Chinese filings. Honesty & Patent IP Law Firm is concentrated in South Korea, and Rabin & Berdo handles a substantial part of the U.S. portfolio.
The records also show A.P.T. Patent and Trade Mark Attorneys supporting Australian filings, InvestPro & Associates in Vietnam, and Ade & Company in Canada.
Looking Forward
The company’s next challenge is execution at scale. The immediate milestones include completing the proposed Nasdaq transaction, constructing and equipping the Dunkirk facility, commissioning the production lines, maintaining manufacturing yield and product consistency during the production ramp, and qualifying Gen4 battery cells for demanding customer applications.
Customer development is already under way. In June 2026, ProLogium and OPmobility signed a memorandum of understanding to develop next-generation solid-state battery modules for mobility applications. ProLogium also signed an MoU with Elysian Aircraft to explore battery applications in electric aviation. These agreements remain development collaborations rather than commercial orders, so qualification results, manufacturing economics, and firm purchasing commitments will be more meaningful indicators of progress.