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HIAMS in the U.S.A.

[Image] Smaller and Lighter Lithium-Ion Batteries Energy Source for Hybrid Vehicles, reducing CO2 Emissions

Lithium-ion batteries provide higher charging efficiency and no memory effect, giving them an advantage over nickel-hydrogen batteries. With such excellent characteristics, the lithium-ion batteries are considered to be the most likely power source for HEVs FCEVs and so on. In 1999, we developed lithium-ion batteries featuring long service life, high output, high energy density, and high reliability, and delivered them to HEV. It has been adopted as the battery for eco-friendly cars by its distinct features for better charging efficiency than the Nickel metal hydride battery and memory-effect-free performance. In actual application for vehicles,many cells need to be combined as a module to form a battery pack with additional control circuit to monitor voltage or temperature for safety use. Moreover reliability under severe conditions and high safety level in case of crash or accident is required. The Hitachi's R&D Group is developing battery of "long operating life", "high power", "high energy density", "high durability", "safety", and "low cost" for automotive applications. These batteries are now widely used in hybrid electric small-sized trucks, buses and hybrid railway motorcars.

Image:Lithium-ion battery


  • Achievement of Lithium-ion battery with both high power assistance and high energy efficiency
  • Contribution to high fuel efficiency, reduction of CO2 emission and improvement of acceleration performance for Hybrid Electric Vehicles (HEV)
  • Enhancement of Electric Vehicles (EV)-mode driving range and realization of high power assistance in Hybrid Electric Vehicles (HEV)-mode


  • High input and high output power, good life performance and high level of safety
  • Proposal of the best battery module design and the total battery management system
  • Achievement of high capacity of 4-5 times higher than our current lithium-ion battery for Plug-in Hybrid Electric Vehicles (PHEV) by the improvement of electrode active materials
  • Application of a heat-resistance separator to prevent internal short-circuit and drastically improve safety
  • Realized the downsizing and advancement of reliability by introducing the newly developed ASIC in the cell controller


Lithium-Ion Batteries are quickly becoming an efficient energy choice used to power the vehicles of tomorrow. Hitachi is helping to deliver a clean and comfortable global experience by supplying Lithium-Ion Batteries for use in hybrid electric vehicles.

  • FHEV : Full Hybrid Electric Vehicles
  • PHEV : Plug-in Hybrid Electric Vehicles
  • EV : Electric Vehicles

Image:Lithium-ion Battery Cell

Cylindrical / Prismatic Lithium-ion Battery Cell

Image:Inverter for HEV

115V Lithium-ion Battery Module

Image:Motor for Hybrid Truck

173V Lithium-ion Battery Module

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