The "ONE Inverter" Revolution: How IAV and Nexperia Are Redefining EV Battery Intelligence

In a significant leap forward for automotive engineering, engineering specialist IAV and semiconductor giant Nexperia have announced a strategic partnership under the banner of the "ONE Inverter" project. This collaboration aims to move beyond the current industry trend of simply increasing battery pack capacity, focusing instead on a paradigm shift: maximizing the performance of every individual battery cell through advanced, software-defined architecture. By fundamentally changing how power is managed within an electric vehicle (EV), the partners hope to resolve the "weakest link" bottleneck that has long plagued high-voltage battery systems.

Main Facts: Moving Beyond Bulk Energy Storage

Historically, the performance of an EV’s traction battery has been limited by its most deficient cell. Because traditional battery management systems (BMS) treat the battery pack as a singular, monolithic block, the entire system is forced to throttle its output to match the capability of the weakest cell in the series. This results in significant energy waste and limits the overall potential of the vehicle.

The "ONE Inverter" initiative introduces a revolutionary approach: a software-controlled, cell-level architecture. Instead of treating the battery as a uniform entity, this new design allows the vehicle’s control software to interact with and manage each cell individually. Through dynamic power allocation, the system can draw precisely the amount of energy each cell is capable of providing at any given moment. This ensures that a single aging or slightly less efficient cell no longer dictates the performance floor of the entire battery pack, significantly improving both efficiency and reliability.

Technical Foundations: The Role of Wide-Bandgap Semiconductors

The realization of this high-resolution power management requires hardware that is both incredibly fast and exceptionally efficient. This is where Nexperia’s proprietary Wide-Bandgap (WBG) semiconductor technology comes into play.

At the heart of the "ONE Inverter" architecture is a bidirectional Gallium Nitride (GaN) power device. GaN technology is highly valued in power electronics for its ability to switch at significantly higher frequencies and voltages than traditional silicon-based components, all while maintaining lower thermal losses. By integrating these GaN-based devices at the cell level, the system can achieve the granular control necessary to switch power flow in real-time without the massive overhead in size or cost that would have made such a system unfeasible only a few years ago.

Furthermore, the design utilizes Nexperia’s broader portfolio, including specialized bipolar components, to support the system architecture. By aligning these semiconductor specifications with IAV’s system-level design expertise, the partners have created a solution that is not just technically superior, but economically viable for mass-market implementation.

Chronology: A Roadmap to Next-Generation Mobility

The "ONE Inverter" project represents the culmination of a long-term strategy to address the "software-defined vehicle" (SDV) trend. While the public announcement marks a major milestone, the collaboration is built on a timeline of intensive research and development aimed at overcoming the traditional constraints of EV powertrains.

• Initial Research Phase: IAV and Nexperia began by analyzing the limitations of existing Battery Management Systems (BMS). They identified that the move to higher voltage architectures—crucial for faster charging—was being hindered by the lack of granular control over individual cells.
• Architectural Concept Development: The partners shifted the focus from merely increasing battery density to optimizing the "intelligence" of the power conversion process. This led to the concept of the "ONE Inverter," which integrates conversion functions directly into the battery management logic.
• Component Selection: Engineers selected Gallium Nitride (GaN) and Silicon Carbide (SiC) as the primary WBG materials to ensure the system could handle the high-power demands of modern EVs without excessive heat dissipation.
• Integration Testing: The current phase involves scaling these laboratory-tested concepts into automotive-grade hardware that meets stringent safety and durability standards.

Supporting Data: Why Efficiency Matters

The automotive industry is currently locked in an "arms race" to increase range. However, simply adding more battery cells increases vehicle weight, which in turn necessitates larger brakes, stronger chassis components, and more energy-intensive manufacturing.

According to industry metrics, a cell-level management system can improve the usable energy of a pack by 5% to 15% without changing the underlying chemistry of the cells themselves. By allowing the system to extract the maximum available charge from every cell, automakers can effectively "unlock" hidden range. Furthermore, this dynamic approach mitigates the degradation of the pack over time; by preventing the stress that traditionally occurs when a weak cell is forced to match the output of its neighbors, the overall lifespan of the battery system is extended, reducing the total cost of ownership for the end-user.

Official Responses: The Synergy of System Design and Semiconductors

The partnership is characterized by a high level of technical synergy. IAV, known for its deep roots in automotive systems engineering, provides the architectural framework, while Nexperia provides the specialized hardware that makes the theory a reality.

"The strength of IAV lies in our ability to translate technological innovations into system-level solutions for our clients," said IAV CEO Jörg Astalosch. "Together with Nexperia, we are exploring how software-defined battery architectures can set new benchmarks in efficiency, flexibility, and robustness for future software-defined vehicles."

Edoardo Merli, a senior manager at Nexperia, emphasized the importance of the early-stage collaboration: "Strong partnerships are the key to driving innovation in next-generation vehicle architectures. By combining our expertise in wide-bandgap semiconductors—which includes both Silicon Carbide and Gallium Nitride—with the advanced system concepts of our partner IAV, we are enabling entirely new approaches to the design of e-mobility solutions. A close collaboration at an early phase allows us to align semiconductor and system requirements and turn innovative ideas into scalable, high-performance solutions."

Implications for the Automotive Industry

The implications of the "ONE Inverter" project extend far beyond a single component. As the automotive industry transitions to software-defined vehicles, the ability to control hardware at the most granular level will become a core competitive advantage.

1. The Death of the "Weakest Link"

The traditional dependency on the weakest cell has been a significant barrier to the longevity of EV batteries. By bypassing this limitation, the "ONE Inverter" architecture promises to make batteries more resilient, potentially allowing for the use of more diverse cell types or chemistries that might otherwise be deemed too inconsistent for high-performance use.

2. Streamlining the Powertrain

By integrating power conversion functions into the battery system, manufacturers may eventually be able to reduce the size and weight of the central traction inverter. This reduces the overall complexity of the high-voltage harness, leading to lighter vehicles and more efficient manufacturing processes.

3. Accelerated Charging Speeds

Granular control allows for more precise thermal and voltage management during the charging process. This means that chargers can communicate more effectively with individual sections of the battery, potentially allowing for faster, safer charging cycles that don’t compromise the long-term health of the battery cells.

4. Sustainability and Circular Economy

By extending the life of the battery pack through better management, the "ONE Inverter" project contributes to the circular economy. Batteries that last longer in the vehicle require fewer replacements, and when they eventually do reach the end of their automotive life, they are likely to be in a better state of health for "second-life" applications, such as stationary energy storage for renewable energy grids.

Conclusion

The "ONE Inverter" collaboration between IAV and Nexperia is a prime example of how the next phase of the electric mobility revolution will be defined not just by raw power, but by intelligent power. By leveraging the superior electrical properties of Gallium Nitride and the sophisticated system-design capabilities of IAV, the project is tackling the fundamental inefficiencies that have held back battery technology for years. As the automotive industry moves toward a future where vehicles are increasingly software-defined, the ability to manage every millivolt of energy with precision will be the hallmark of the most successful and sustainable EVs on the road.