ProLogium and Rimac Technology have reached a new milestone in their collaboration to develop next-generation electric vehicle batteries, unveiling a battery pack concept mockup at the 2026 Paris Motor Show.
The two companies signed a Memorandum of Understanding (MOU) in September 2025 to jointly develop a next-generation battery platform. With the concept mockup now completed, the project is moving toward functional hardware development, bringing the partners closer to testing battery integration technologies designed for battery electric vehicles (BEVs).
The next phase will focus on developing a functional battery segment to evaluate thermal management and cell-integration concepts. The results will help guide the development of a full-scale functional battery pack and subsequent in-vehicle testing.
The partnership combines ProLogium’s advanced battery cell technology with Rimac Technology’s expertise in battery systems engineering. Its primary focus is a pouch cell-to-pack architecture, an approach designed to integrate battery cells into a pack more directly while optimizing space, weight and overall system performance.
Moving from battery cell technology to a complete automotive battery system involves more than improving energy density or charging performance. Engineers must also address thermal management, cell swelling, structural integration and the challenges of fitting the battery into a vehicle.
The completed concept mockup represents the first step in evaluating these requirements at the battery-pack level. The next stage will introduce functional hardware, allowing the companies to test their proposed integration solutions and collect engineering data before moving to a full-scale battery system.
This staged development process is intended to identify potential design improvements early, helping the partners evaluate different approaches before committing to full-scale battery pack production and vehicle integration.
Solid-State Battery Technology and Cell-to-Pack Architecture
Rimac Technology is developing scalable cell-to-pack integration technology for solid-state pouch cells, according to Daniel Kišić, the company’s Principal Product Architect.
The development program is evaluating multiple battery integration solutions in parallel, including approaches to thermal management, swelling management, cell integration and overall system design.
Some configurations prioritize maximum energy density and reduced battery size and weight, while others focus on delivering higher performance. The engineering work starts with vehicle-level requirements and aims to reduce complexity, combine functions and improve the battery system’s overall efficiency while keeping costs in consideration.
If successfully validated, the technology could offer automakers several potential advantages. A lighter battery could improve vehicle efficiency and extend driving range, while more compact packaging could create additional space for other vehicle components.
Manufacturers could also use the weight savings to install a battery with greater energy capacity without significantly increasing the overall vehicle weight. Alternatively, they could opt for a smaller, lighter battery while maintaining a similar driving range.
However, these benefits remain development objectives rather than confirmed production specifications. The final results will depend on testing and validation at the battery and vehicle levels.
ProLogium and Rimac Technology Outline Battery Development Timeline
The companies are following a phased roadmap that will take the project from the concept stage toward functional battery hardware and real-world vehicle testing.
According to Rimac Technology’s current development plans, the next major milestones are:
– CES 2027: Planned presentation of the functional battery segment currently in development.
– Second half of 2027: Target milestone for a full-scale functional battery pack.
– Second half of 2028: Planned in-vehicle integration and public-road testing.
Each stage will expand the scope of validation. Testing the functional battery segment will allow engineers to assess individual integration concepts before advancing to a complete battery pack. Subsequent vehicle testing will help evaluate how the technology performs under automotive operating conditions.
These dates represent development targets and do not establish when a production-ready battery or vehicle equipped with the technology will reach the market.
