A proprietary lithium-ion battery pack built around a nickel-manganese-cobalt-based Dow Kokam cell, has four times the power and energy storage of lead-acid batteries in half the volume and a quarter of the weight. Each of these battery packs, from Corvus Energy, delivers at least 22% more power and energy density than the most powerful lithium-ion phosphate batteries used in electric vehicles and consumer products.
The company says its 6.2-kWh battery modules can be customized for higher power or higher energy, depending on application. The battery is intended to optimize or replace diesel power in heavy industrial machinery, such as tug boats that run at idle most the time. Dow Kokam cells make such applications possible because of their high-charge-discharge rates, high energy-capacity storage, and a consistent discharge rate for long periods.
Corvus says it invested more than $5 million to create a safe, modular, fully enclosed battery pack durable enough to withstand harsh ocean and port environments, last 20 years or more, and work well from -4 to 140°F.
Each battery can rapidly charge at 2°C, as well as discharge at 10°C, meaning each module can fully charge its 6.2-kWh capacity in a half hour and release its full 6.2-kWh capacity in six minutes. Its peak discharge current is 1,000 amps and will run continuously at 500 amps — all without damage to the battery, says Corvus.
The company says its batteries are the only ones that can provide tremendous continuous amp rates, as well as power the energy density required to replace diesel power in heavy industrial machinery.