What are the differences between power lithium battery and energy storage lithium battery?
From the perspective of application scenarios, power lithium batteries are mainly used in the fields of electric vehicles, electric bicycles and other electric tools, while energy storage lithium batteries are mainly used in the fields of peak load regulation and frequency regulation power auxiliary services, renewable energy grid connection and Microgrid.
Due to different application scenarios, the battery performance requirements are different. First of all, as a mobile power supply, lithium-ion power battery has high requirements for volume (and mass) energy density under the premise of safety, so as to achieve more lasting endurance. At the same time, users also hope that electric vehicles can be charged safely and quickly. Therefore, power lithium batteries have high requirements for energy density and power density. Just because of safety considerations, energy batteries with charge discharge capacity of about 1C are generally used.
Most of the energy storage devices do not need to move, so there is no direct requirement for energy density. As for power density, different energy storage scenarios have different requirements.
Chen Yongzhen, head of the energy storage technology research group of the Institute of electrical engineering, Chinese Academy of Sciences, once pointed out that for peak load regulation, off grid photovoltaic energy storage or peak valley price difference energy storage scenarios on the user side, the energy storage battery is generally required to continuously charge or discharge for more than two hours, so it is suitable to use capacity battery with charge discharge rate ≤ 0.5c; for energy storage scenarios with power frequency regulation or smoothing renewable energy fluctuations, it is suitable to use capacity battery with charge discharge rate ≤ 0.5c, The energy storage battery needs to charge and discharge rapidly in the time period from second level to minute level, so it is suitable for the application of ≥ 2C power type battery. In some application scenarios that need to undertake frequency modulation and peak shaving at the same time, energy type battery is more suitable. Of course, in this scenario, power type battery and capacity type battery can also be used together.
Secondly, compared with power lithium battery, energy storage lithium battery has higher requirements for calendar service life. The life of new energy vehicles is generally 5-8 years, while the life of energy storage projects is generally expected to be more than 10 years. The cycle life of power lithium battery is 1000-2000 times, while the cycle life of energy storage lithium battery is generally required to be more than 3500 times. We hope to develop new operation and maintenance regeneration technology to achieve ultra long calendar energy storage life.
Label: power lithium battery energy storage