A, hydrogen fuel cell industry chainIn hydrogen fuel cell industry chain upstream is the production, transportation and storage, hydrogen at filling stations for hydrogen fuel cell system for hydrogen filling; Middle is the production of key components, such as electric pile, the pile and accessories of two parts for integration, form a hydrogen fuel cell system; In the downstream application level, mainly include transportation, portable power supply and stationary power three directionsSecond, power battery compares the advantages and disadvantages inAt present in terms of transportation with a power source, there are four main technical route: Lithium ion batteries, hydrogen fuel cells, supercapacitors and aluminum air battery.