Battery systems set to save weight on trains

Multi-million-Euro framework agreement covers rechargeable Ni-MH battery systems that will save around 1600kg of weight on Alstom's new AGV very high speed trains.

Alstom and Saft have just signed a multi-million-Euro framework agreement to develop and supply at least 300 fully integrated plug-and-play rechargeable Ni-MH (nickel metal hydride) battery systems that will save around 1600kg of weight on Alstom's new AGV very high speed trains.

The Saft Ni-MH batteries, which will provide up to three hours of emergency backup power for the AGV's safety and auxiliary circuits, are maintenance-free, so will also offer a considerable reduction in battery maintenance costs for the train operator.

Saft nickel-cadmium (Ni-Cd) batteries are installed on Alstom's first three generations of TGV very-high-speed trains.

Alstom is now developing the fourth generation.

This new train will have a fully articulated and modular architecture particularly adapted to the development of interregional traffic between middle-sized towns and is capable of carrying from 280 to 460 passengers at speeds up to 350km/h.

The AGV features distributed traction, with the transformer, convertor and auxiliary functions spread over three cars, and will offer more modularity and operational flexibility, due to the capability to couple from seven to 11 trailers.

A key design goal for the AGV is to achieve very significant weight savings in order to maximise energy efficiency.

The Saft Ni-MH batteries, developed to offer excellent energy storage in a compact lightweight package, are helping to achieve this aim as each 110V battery system, comprising 90 cells, will weigh just 500kg - 270kg less than the equivalent Ni-Cd (nickel-cadmium) battery.

Typically, six battery systems will be fitted to each trainset, and so the overall weight saving will be 1620kg.

Furthermore the Saft Ni-MH batteries are maintenance-free, and will make an important contribution towards the AGV's targeted 30% reduction in maintenance costs.

Saft is providing a fully integrated plug-and-play battery system for the AGV, comprising its Ni-MH batteries mounted in a tray ready for installation below the train floor, and complete with a dedicated charger as well as the electrical control and monitoring systems.

A dedicated BMS (battery management system) developed by Saft will manage the charging and discharge processes.

As part of its turnkey service, Saft will also carry out all the required qualification tests including vibration and EMC (electromagnetic compatibility) testing.

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