Which industry does the energy storage flywheel belong to in the national economy?

Knowledge-intensive enterprises. Energy storage flywheel products have a high degree of specialization and small market demand. The whole industry is in its infancy, and the number of flywheel enterprises is very small. Judging from the number of enterprises, flywheel energy storage is a knowledge-intensive enterprise in the national economy. Industry refers to the organizational structure system of business units or individuals engaged in production, services or other economic and social activities of the same nature in the national economy.