Proterra Inc. has selected Toshiba as the battery supplier for its next-generation, all-electric bus from Proterra Inc. The new fleet will use Toshiba’s Rechargeable Batteries (SCiB), a safe rechargeable battery solution with high-rate performance and long-life capabilities that is used in a wide range of applications, from EVs to grid energy storage. (Earlier post.)
Featuring a Lithium Titanate Oxide (LTO), Toshiba’s SCiB batteries have excellent thermal performance, enabling their high-rate charging capability. The lithium-titanate chemistry contained in SCiB makes the batteries highly resistant to thermal runaway and lithium metal plating, providing exceptional battery safety characteristics.
The 20Ah prismatic SCiB cell has a nominal voltage of 2.3 V, with gravimetric energy density of 90 Wh/kg and volumetric density of 177 Wh/L. The cell can charge from 0% SOC to 80% in 6 minutes. SCiB cells also offer high continuous power output.
SCiB products also offer minimal capacity degradation and are capable of 10,000 or more charge-discharge cycles, depending on operating conditions. This operational life often exceeds that of the applications in which they are used, eliminating the need for battery replacement and reducing the environmental impact of waste batteries.
With a rapid recharge capability and outstanding life performance, Toshiba’s SCiB battery is ideally suited for zero-emission public transit.—Greg Mack, Vice President of Toshiba International Corporation’s (TIC) Power Electronics Division
In addition to having nearly six times the fuel economy per kilometer/mile (when translated into conventional fuels) of a diesel bus, Proterra electric buses feature a fast charge system that takes less than 10 minutes to charge during regularly scheduled route stops, making the buses well-suited to transit applications.