Saft, a TotalEnergies subsidiary, supplies Siemens Mobility with lithium titanate oxide (LTO) traction batteries. These will power seven Mireo Plus H hydrogen trains in Germany. LTO batteries offer advantages over previous lithium-ion generations, including enhanced safety, reliability, lower CO2 emissions, extended lifespan, and increased power.
Key Features of LTO Batteries
- Lithium titanate anodes instead of carbon or graphite
- Prismatic cell format for optimal packing density
- Service life of 10-15 years
- Fast charging capability (full charge in ≤10 minutes)
- Operational flexibility (can be held at 0% state of charge without damage)
- High intrinsic safety, requiring fewer fire suppression measures
Versatile Applications Beyond Rail
While LTO batteries are initially being deployed in the rail industry, their unique characteristics make them well-suited for a wide range of applications that demand fast charging and long cycle life. One such application is in Automated Guided Vehicles (AGVs), which are increasingly used in warehouses and hospitals. LTO batteries enable AGVs to quickly recharge at docking stations, ensuring continuous operation without the need for prolonged downtime.
The aerospace sector is another area where LTO batteries are poised to make a significant impact. In Low Earth Orbit (LEO) satellites, they offer several advantages, including reduced mass and an extended temperature range of -30°C to +70°C. This eliminates the need for heaters, simplifying satellite systems and increasing overall energy efficiency. Furthermore, the high charge and discharge rates of LTO batteries make them ideal for radar and agile satellites, allowing for rapid recharging during short sunlight periods.
Balancing Fuel Cell and Battery Power
In Mireo Plus H trains, fuel cells serve as the primary power source. LTO batteries provide acceleration assistance, recover kinetic energy during braking, and balance the load during cruising. This ensures optimal fuel cell efficiency. Each train includes two LTO batteries, one per two-car trainset.
Manufacturing and Delivery
Saft developed the LTO technology at its research center in Bordeaux. They are assembled in Nersac, France. Deliveries to Siemens Mobility began in the summer of 2024.
As demand for cleaner transportation solutions grows, Saft’s advanced LTO batteries offer a reliable and efficient option. They are well-suited for powering hydrogen trains and other applications requiring fast charging and long cycle life.
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