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Latest Information 2015 Vol. 455

Sumitomo Electric Group’s automotive products used in FCV MIRAI meet the environmental needs of motorized society.

The Sumitomo Electric Group provides various automotive products, such as components for HEVs and EVs, to meet the needs of the times. Our extensive product line-up includes EV charging connectors and HEV underfloor pipe harnesses that protect wires with an aluminum pipe and provide excellent shock resistance and electromagnetic noise shielding.

MIRAI is a mass-produced FCV*1 launched by Toyota Motor Corporation in 2014. The vehicle incorporates numerous products of the Sumitomo Electric Group, which is the main wiring harness supplier, because Sumitomo Electric has a long track record in developing and shipping such products, which the automaker values.

The stack subharness newly developed by Sumitomo Electric is used in fuel cell (FC) stacks. In addition, hydrogen pump cables used with hydrogen circulation pumps*2 have also been newly developed and supplied to the client.

The Sumitomo Electric Group’s other wiring harness products include high-voltage cables for air conditioners and water pump cables. Furthermore, various other products of the Group have been delivered on the back of its highly regarded development capabilities, and have been incorporated in EVs and HEVs, including the electronic control component Gateway ECU, hydrogen hoses from Sumitomo Riko Co., Ltd., cell gaskets, which are rubber seals, and the vibration-proof rubber stack mount.

MIRAI is presently produced at a rate comparable to handmade products of several units per day, placing the highest priority on quality. The vehicle is selling well, and so Toyota has decided to boost production.

The Sumitomo Electric Group remains committed to providing well-engineered quality products that contribute to building a better society.

FCV: Fuel Cell Vehicle. An FCV uses hydrogen and oxygen to generate electricity for propulsion. Only water is emitted in the power generation process, and so FCVs do not produce CO2 emissions during driving.
Hydrogen Circulation Pump: A device used to re-supply, to the FC stack, unreacted hydrogen from the power generation process and water produced through chemical reaction. The hydrogen circulation pump enables the FCV to use hydrogen without waste.
Automotives Business Unit

Establishment of Hydrogen Station Joint Venture

Sumitomo Wiring Systems, Ltd. has established a joint venture with Japan Transcity Corporation, Mie Toyota Motor Co., Ltd. and Taniguchi Oil Corporation to operate mobile hydrogen stations on a commercial basis, the first such attempt in Mie Prefecture.

In recent years, steps have been taken towards creating a hydrogen-based society in Japan, such as the government’s announcement of the Strategic Road Map for Hydrogen and Fuel Cells. Fuel cell vehicles (FCVs) began to be mass produced and appear on the market at the end of 2014 ahead of other countries. To enable widespread use of the so-called ultimate ecological car, or FCV, it is crucial to build hydrogen stations for supplying hydrogen to FCVs. Aiming to install some 100 hydrogen stations by the end of fiscal 2015, the government is working on development programs such as strengthening the subsidy program and reviewing the regulations. However, it has been difficult to set up hydrogen stations in provincial areas due to cost, institutional reasons, supply and demand and other issues.

Accordingly, the above-mentioned four Mie-based companies established a joint venture for operating mobile hydrogen stations to facilitate the wider use of FCVs in the prefecture and help build environment-friendly local communities. The first group of hydrogen stations in Mie Prefecture will be installed in Yokkaichi and Tsu, followed by other cities in turn as planned.

The Sumitomo Electric Group is committed to conserving the environment by operating hydrogen stations.

Mobile hydrogen station (conceptual image)
Mobile hydrogen station (conceptual image)

Profile of the Joint Venture

Trade Name
Mie Hydrogen Station Limited Liability Company
Head Office
Hamada-cho, Yokkaichi City, Mie Prefecture (in the Head Office of Sumitomo Wiring Systems, Ltd.)
10 million yen
Sumitomo Wiring Systems, Ltd. (35%), Japan Transcity Corporation (35%), Mie Toyota Motor Co., Ltd. (15%) and Taniguchi Oil Corporation (15%)
Hydrogen supply by mobile hydrogen stations
of Operation (Planned)
April 2016
Sumitomo Wiring Systems, Ltd.

High-strength shear reinforcement Sumi-Hoop™ (KSS 785) awarded a performance certificate of suitability for a new design formula for damage control

High-strength shear reinforcement Sumi-Hoop™(KSS785)
High-strength shear reinforcement Sumi-Hoop™

We have been awarded a building technology and performance certificate that verifies that our reinforced concrete beams and columns incorporating the high-strength shear reinforcement*1 Sumi-Hoop™ are suitable for a new permissible shear stress design formula for damage control.

This recently awarded certificate was issued by General Building Research Corporation of Japan in accordance with the New RC Standards*2 established in 2010. Compared with the conventional design formula, the new permissible shear stress design formula for damage control*3 enables more efficient design, permitting less shear reinforcement to be used in some cases. Moreover, the designer is allowed to select from more options for the ultimate strength design*4 since the designer can use Arakawa’s mean equation, which is an empirical formula, in addition to the theoretical formula of plasticity. Awarded the performance certificate, Sumi-Hoop™ is expected to meet the advanced needs of designers and help reduce labor on site.

Shear reinforcement: Steel bars placed to reinforce construction members and stop them fracturing due to internal shear forces generated by earthquake motion or the like
New RC Standards: Short for the AIJ Standards for Structural Calculation of Steel Reinforced Concrete Structures and Brief Commentary (2010). The New RC Standards are the Architectural Institute of Japan’s calculation standards revised in 2010.
Damage control: Regulation of post-earthquake residual crack widths below the applicable damage limits
Ultimate strength design: Strength design intended to prevent the destruction or collapse of building structures in the event of a major disaster including earthquakes

Development of Uniquely Structured High-Efficiency SiC Power Transistor

Cross-sectional view of the newly developed VMOSFET
Cross-sectional view of the newly developed VMOSFET

Sumitomo Electric has developed a power transistor with a unique structure consisting of silicon carbide (SiC). This V-groove metal oxide semiconductor field effect transistor (VMOSFET, see figure) is seen as a next-generation power semiconductor. This product uses a particular plane orientation (0-33-8) for the channel that turns on/off the flow of electrons, enabling the formation of an oxide film interface with relatively few defects. As a result, the new transistor achieves a blocking voltage of 1,200 V and a remarkably low on-state resistance of 2.0 mΩcm2. The low-defect performance of this transistor also greatly stabilizes the threshold voltage fluctuation (at 0.12 V or less at 175ºC for 1,000 h) which has prevented the use of SiC transistors to date.

Due to these advantages, the new SiC transistor is suitable for automotive electronic devices for which demand is expected to increase in future with the computerization of electric vehicle (EV)/hybrid electric vehicle (HEV) and other vehicle drive systems. For photovoltaic and other regenerative energy generation systems, the new transistor was installed in a solar power conditioner being developed by Sumitomo Electric and has demonstrated the industry’s highest efficiency of 97.6%.

Power Device Development Div.

Yuta Konishi to Represent Japan at the World Championships in Athletics!

Mr. Konishi running for the championship in the final moments of his race at the Seiko<br /> Golden Grand Prix 2015 Kawasaki. (To his right is Rasmus Magi from Estonia) (Photo provided by Rikujo Kyogi [Athletics Sports] Magazine)
Mr. Konishi running for the championship in the
final moments of his race at the Seiko Golden
Grand Prix 2015 Kawasaki.
(To his right is Rasmus Magi from Estonia)
(Photo provided by Rikujo Kyogi [Athletics Sports]

Yuta Konishi of our athletics club has been selected to represent Japan at the World Championships in Athletics, which will be held in Beijing from Saturday, August 22 to Sunday, August 30.

This is the first time that a member of our athletics club will participate in the event.

The meet will be broadcast on TV. On his behalf, we would like to ask you to give him your warm support.

HR & Administration Division

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