14 May 2016


Battery-electric bus manufacturer Proterra announced recently a new battery pack design for the Proterra Catalyst XR transit vehicle at the American Public Transportation Association Bus and Paratransit Conference (APTA). Within the same volumetric footprint as that in the original Catalyst XR, the new energy storage system now holds 28% more energy at 330 kWh.
All current Catalyst XR customers that are still waiting on their buses to be delivered will receive a complimentary upgrade to the higher energy level.

Proterra offers both extended-range (XR) and fast-charge (FC) versions of its electric bus, using different battery technologies. (Earlier post.) The TerraVolt FC fast charge battery option (lithium titanate, LTO chemistry) allows for maximum run time with minimum dwell time. The first Catalyst XR Extended Range product uses an NMC higher energy-density pack.

The XR is compatible with the fast charging equipment (although the charge will not be as quick as with the FC); full charge recovery can be accomplished in less than 90 minutes.

In the company’s battery-engineering lab in Silicon Valley, Proterra engineers are designing batteries specifically for heavy-duty EV transit. With extensive background in mechanical, electrical and battery systems engineering, the team architected a new Catalyst XR battery pack for optimal efficiency which now delivers additional range while remaining the lightest vehicle in its class.

Proterra is not yet disclosing changes made to the cells or to the mechanical design of the pack to deliver the boost in capacity within the same volumetric footprint.


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