The pursuit of higher power density and optimal operating temperature is central to the evolution of fuel cell stacks, particularly within China's rapidly expanding new energy sector. Power density, measured in kilowatts per liter (kW/L) or per kilogram (kW/kg), directly dictates the compactness, weight, and ultimately the performance and range of fuel cell vehicles (FCVs). Chinese researchers and manufacturers are aggressively targeting breakthroughs in this area through material innovation and advanced stack design. Key strategies include developing ultra-thin metallic bipolar plates with enhanced flow fields, improving the catalytic activity and durability of membrane electrode assemblies (MEAs), and optimizing gas diffusion layers. These efforts aim to reduce the stack's physical footprint while maximizing its electrical output, a critical step for commercial competitiveness.

Concurrently, managing the operating temperature is a fundamental challenge, especially for the dominant Proton Exchange Membrane Fuel Cell (PEMFC) technology. PEMFC stacks typically operate between 60°C and 80°C. Operating below this range leads to poor reaction kinetics and water flooding, while exceeding it risks dehydrating the proton exchange membrane, causing irreversible damage. China's climate diversity, from frigid northern winters to hot southern summers, imposes stringent demands on thermal management systems. Advanced thermal management strategies are therefore a key R&D focus. This involves sophisticated coolant channel design within bipolar plates, the development of high-performance heat exchangers, and intelligent control algorithms that dynamically balance heat generation with dissipation. Effective thermal management ensures stack durability, consistent power output, and quick cold-start capabilities—a vital metric for automotive applications.

The synergy between power density and operating temperature is intricate. Pushing for extreme power density can intensify heat generation per unit volume, making thermal management more difficult. Therefore, China's technological pathway emphasizes a balanced, systems-level approach. Innovations are not only happening at the component level but also in system integration and control software. Nationwide policies and substantial R&D investments are fostering collaboration between academia, such as Tsinghua University and Tongji University, and leading enterprises like SinoHytec and REFIRE. This ecosystem is accelerating the iteration of stack technology, moving from laboratory prototypes to mass-production models that meet real-world demands for efficiency, durability, and cost. The progress in these core parameters is solidifying China's role as a formidable innovator and manufacturer in the global fuel cell arena, driving the transition towards a sustainable hydrogen economy.