Core Requirements of Energy Storage Battery ( lithium batteries)

The core demand of energy storage batteries (lithium batteries) is high safety, long life and low cost.(1) Energy density and power density: The power battery has high requirements for volume energy density and power density to meet the needs of endurance and fast charging.

The vast majority of energy storage devices layout space, energy storage lithium battery energy for volume energy density requirements, different scenarios for different power density requirements; (2) life: the life of new energy vehicles is generally 5-8 years, the cycle life of power lithium battery is 1000-2000 times.

The life of energy storage project is generally more than 10 years, and the cycle life of energy storage lithium battery is more than 3500 times; (3) Cost: the scale of energy storage power station is above megawatt level, so the cost requirement of energy storage lithium battery is lower and the safety requirement is higher than that of power lithium battery.

Improving the service life of batteries can effectively reduce the cost of energy storage systems. The performance parameters of the battery include the system life, discharge depth DoD, system efficiency, life termination capacity, etc.

When considering the way to reduce the cost from the above parameters, the method of increasing the system life has a large space for improvement.

According to calculation, it is known that one charge and one discharge every day can configure the power side energy storage for two hours.

When other parameters are certain, when the cycle number is 5,000 times and the cycle life is increased to 10,000 times, the corresponding LCOS price is about 0.02usd / kwh lower.

System life has a significant negative correlation with the kilowatt-hour cost of the energy storage system, and improving the system life can effectively reduce the cost of the energy storage system.