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Ide K.,Information and Control Systems Research Center | Nakatsu K.,Information and Control Systems Research Center | Hombo H.,Advanced Battery Research Center | Maki K.,MOTOR Information Systems
Hitachi Review | Year: 2011

Overview: As an application systems technology which deals primarily with the use of power semiconductors for electrical conversion and control, power electronics is essential to achieving better energy efficiency. The component technologies used in the field include inverters, batteries, and motors. Hitachi researches and commercializes advanced power electronics technology in a wide range of fields extending from power devices to power system control. Through technologies that utilize direct water cooling to improve the power density of inverters, techniques for reducing the losses in power semiconductors, materials technologies for increasing the energy density of lithium-ion batteries, and optimum design techniques that help make motors smaller, lighter, and more efficient, Hitachi is playing a part in the field of green mobility, including EV systems that achieve low fuel consumption and emissions.


Hombo H.,Advanced Battery Research Center | Kono K.,Advanced Battery Research Center | Okumura T.,Advanced Battery Research Center | Yuasa T.,Advanced Battery Research Center
Hitachi Review | Year: 2011

Overview: Lithium-ion batteries are used in mobile phones, portable PCs and various other consumer devices and the expectation is that they will be used extensively in the future in applications such as hybrid electric cars and other vehicles as well as in energy storage systems installed at wind and other electricity generation facilities. The development of large lithium-ion batteries for these applications needs to achieve higher output, higher energy density, longer life, and lower cost. Hitachi has been working on research into innovative battery materials for many years with the aim of producing large lithium-ion batteries, including developing long-life manganese cathodes, carbon anodes, and electrolytes with low resistance, and designing electrode structures suitable for large batteries. It is Hitachi's hope that it will be able, through its lithium-ion battery business, to make progress on measures for helping protect the environment.

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