The cell chemistry has been optimized for higher energy throughput capability, high charge rate acceptance, and a high energy density, producing a battery pack with an energy density of 160 Wh/kg and 260Wh/L. The ISO 26262-certified battery management system monitors cell temperature and voltage with more than 70 sensors capturing 160 different diagnostic data streams from each pack which can be connected in series or parallel. Proterra has also implemented liquid cooling and proprietary state of charge algorithms for rapid charge times and operation in virtually any climate. Onboard vehicle telemetry enables real-time monitoring and over-the-air updates to battery software so fleet operators can track battery performance and reap the benefits of continuous product improvement.
The joint development highlights the growing market demand for high quality energy storage systems. According to Lux Research, batteries for transportation and grid storage are expected to surpass consumer electronics by next year and electric buses are cited as a primary market driver. Proterra’s new Burlingame battery production plant is currently ramping production to meet demand and can produce over 500 MWh of E2 battery packs a year.
“Between Proterra’s leadership in the heavy-duty electric vehicle industry, and the company’s battery expertise, Proterra has been a strong partner for LG Chem to co-develop a battery cell with for this important market,” said Youngsun Kim, LG Chem vice president, marketing. “It is our commitment to be at the leading edge of designing and manufacturing advanced batteries to meet the increasing global demand coming from the electric transportation sector.”
Last year, Proterra introduced the Catalyst E2, the longest-range electric transit bus on the market that can travel up to 1102 miles on a single charge, albeit at 15mph.
“Safety is paramount to our battery design philosophy,” said Dustin Grace, director of battery engineering at Proterra. “We have implemented redundant layers of passive and active safety features into the architecture of the battery in concert with the vehicle itself. Deploying energy storage systems of this scale has led us down a technology path to new and advanced safety features..”
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