Honda's hydrogen station capable of filling with a pressure of 70MPa
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A rear view
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The hydrogen production equipment of the station
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Honda Motor Co Ltd exhibited a hydrogen station that has a filling pressure of 70MPa at Ceatec Japan 2017, which took place from Oct 3 to 6, 2017, at Makuhari Messe in Chiba Prefecture, Japan.

This time, Honda increased filling pressure by 100%, compared with the previous model, so that the new hydrogen station can fully charge the company's "Clarity Fuel Cell" fuel-cell vehicle (FCV) equipped with a 70MPa tank as well as Toyota Motor Corp's "Mirai" FCV with hydrogen.

The hydrogen station has three functions: hydrogen production, storage and filling. By electrolyzing tap water after removing ions from it, the station generates hydrogen and oxygen. The station compresses hydrogen, stores it in a tank and takes it out at the time of filling an FCV with hydrogen. The tank can store 15kg of 15°C hydrogen.

The previous model has been installed at 14 sites (prefectural offices, city halls, airports, etc) in Japan from Miyagi Prefecture in the north to Okinawa Prefecture in the south. It is equipped with a heater so that tap water is not frozen in cold regions.

"In terms of technological development, it was difficult to make a system that increases pressure t0 70MPa," Honda said.

This time, the company made improvements to a solid polymer film with a thickness of about 0.1mm, which is the key to hydrogen production. When water is added to the film and electricity is applied to it. Hydrogen is generated from one side, and oxygen is generated from the other side.

For the new hydrogen station, Honda increased the strength of the solid polymer film so that it can withstand a pressure higher than 70MPa. For that purpose, the company employed a stainless steel valve containing a large amount of nickel for the exit of hydrogen.

The new station can produce 2.5kg of hydrogen per day, which is about 70% more than the hydrogen production capacity of the previous model (1.5kg). With the higher hydrogen production efficiency, the new station is capable of sequential filling in a short period of time.

The station measures 2,250 (L) x 3,700 (W) x 2,570mm (H). For the new station, Honda aims to set a price of ¥100-120 million (approx US$882,145-1,058,574), which is equivalent to the price of the previous model. The release date of the new station has not been decided yet.

Original Japanese article