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What are the characteristics of lithium energy storage batteries

2023-04-17

From the perspective of application scenarios, power lithium-ion batteries are mainly used in the fields of electric vehicles, electric bicycles, and other electric tools, while energy storage lithium-ion batteries are mainly used in the fields of peak shaving, frequency regulation, power auxiliary services, renewable energy grid connection, and microgrids. Due to different application scenarios, the performance requirements of batteries also vary.
Firstly, as a mobile power source, the power lithium battery requires as high a volume (and mass) energy density as possible under the premise of safety, in order to achieve a more durable range. At the same time, users also hope that electric vehicles can be safely and quickly charged, so power lithium batteries have high requirements for energy density and power density. However, due to safety considerations, energy type batteries with a charging and discharging capacity of around 1C are currently commonly used.
The vast majority of energy storage installations do not require movement, so there is no direct request for energy density in lithium energy storage batteries. As for power density, different energy storage scenarios have different requests. Regarding the scenarios of peak shaving, off grid photovoltaic energy storage, or peak valley price difference energy storage on the user side, it is suitable to use capacity type batteries with a charging and discharging rate ≤ 0.5C for ordinary energy storage batteries that require continuous charging or discharging for more than two hours.
Regarding the energy storage scenario where power frequency regulation or smooth renewable energy fluctuates, it is necessary to quickly charge and discharge energy storage batteries in the time range of seconds to minutes, so it is suitable for the application of ≥ 2C power type batteries; In some application scenarios where both frequency modulation and peak shaving are required, energy based batteries are more suitable. Of course, in such scenarios, power based and capacity based batteries can also be used together.

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