|The HTM125 125V heavy-duty transportation module.|
Vossloh Kiepe GmbH, a producer of heavy vehicle drive systems, has selected Maxwell’s 125-volt BOOSTCAP ultracapacitor modules for braking energy recuperation and torque assist in electric buses it is producing in collaboration with Van Hool NV for the Milan, Italy, municipal transit system.
The Vossloh-Van Hool buses for Milan are low-floor articulated vehicles equipped with ultracapacitor-based energy storage systems that absorb and store energy from recuperative braking for reuse in powering electric motors. The basic drive system can use energy supplied via overhead lines or a 100 kW Euro-5 diesel genset.
|Vossloh hybrid drive for mass transit vehicles. Click to enlarge.|
The city of Milan recently announced that it is taking delivery of the first 15 of a total of 70 vehicles it has ordered from Vossloh Kiepe and Van Hool.
Maxwell shipments are scheduled to begin during the current quarter on Vossloh’s order for a total of 300 BOOSTCAP HTM125 heavy duty transportation modules to be delivered by the end of the year.
This is version 2 of the HTM125. New revisions to the module include an improved junction box; PT100 thermistor for temperature monitoring; vent for over pressure management; ground stud for multi units common grounding; design improvements for increased long term reliability; improvements in mechanical stability; and improvements in isolation.
The HTM125 is the result of extensive work with Vossloh Kiepe and other leading transportation OEMs to develop a robust multi-cell module to withstand the harsh environments and extremely demanding duty cycles that are typical in heavy transportation applications. The HTM125 meets transportation industry requirements for watt-hours of energy storage and watts of power delivery per kilogram, and is designed to perform reliably through one million or more deep discharge cycles, or about 15 years of operational life for most vehicles. This is the first of what we expect to be several series production orders for heavy vehicles in Europe.—David Schramm, Maxwell president and CEO
The HTM125 is based on 2.7V BOOSTCAP BCAP3000 Power cells. Nominal capacitance is 63F. Encased in a rugged, splash-proof, IP 65-compliant, aluminum chassis, it weighs less than 60kg and measures 315x425x744mm. Integrated monitoring capabilities and an efficient cooling configuration enable it to sustain continuous current of up to 150 amps with minimal temperature increase in high-temperature environments. Energy capacity is 101.7 Wh.
Up to 12 125-volt modules may be linked in series to deliver a total of as much as 1,500 volts. Maxwell also offers a complete line of standard 15- to 75-volt multi-cell modules.