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What is the difference between power batteries and energy storage batteries?

2023-04-17

For energy storage batteries, the vast majority of energy storage devices do not need to be moved, so lithium energy storage batteries do not have direct requirements for energy density. As for power density, different energy storage scenarios have different requirements.
For power peak shaving, off grid photovoltaic energy storage, or peak valley price difference energy storage scenarios on the user side, it is generally required to continuously charge or discharge the energy storage battery for more than two hours. Therefore, it is suitable to use capacity type batteries with a charge discharge rate ≤ 0.5C; For energy storage scenarios with power frequency regulation or smooth renewable energy fluctuations, 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 use 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.
Compared to power lithium batteries, energy storage lithium batteries have higher requirements for service life. The lifespan of new energy vehicles is generally 5-8 years, while the lifespan of energy storage projects is generally expected to be greater than 10 years. The cycle life of power lithium batteries is between 1000 to 2000 cycles, while the cycle life of energy storage lithium batteries is generally required to be greater than 3500 cycles.
In terms of cost, power lithium-ion batteries face competition with traditional fuel power sources, while energy storage lithium-ion batteries need to face competition with traditional peak shaving and frequency modulation technology. In addition, the scale of energy storage power stations is basically at or above the megawatt level or even at the level of one hundred megawatts, so the cost requirements for energy storage lithium batteries are lower than those for power lithium batteries, and the safety requirements are also higher.

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