The main differences between power batteries and energy storage batteries are: different battery capacity, different application scenarios, differences in battery management system BMS, different types of cells used, different performance and design, and so on.
Power battery, mainly for driving tools, rotating motors to provide power, the main use in electric vehicles, electric trains, electric logistics vehicles, electric two-wheeled vehicles, three-wheeled vehicles, four-wheeled vehicles, golf carts, electric handling and loading trucks, electric boats, unmanned power tools, such as drones, lawnmowers, electric toy cars, unmanned electric handling vehicles.
Energy storage batteries, mainly used in solar power generation equipment and wind power generation equipment for power stations, home energy storage, portable power supply, etc., and renewable energy saving energy with storage batteries.
Power batteries are limited by the size and weight of the car, startup acceleration, and occasionally for climbing mountains to provide high current, so there are higher standards of performance requirements than storage batteries, pay more attention to the charging and discharging power, etc., the requirements of fast charging rate, high output power and shock resistance, especially high safety and high energy density, to achieve a long-lasting range as well as lightweight requirements in terms of weight and volume.
The energy storage battery unit does not need to be moved, and the power and density are required differently in different energy storage scenarios. Weight and volume are generally not too high. The preparation of energy storage batteries emphasizes battery capacity, especially operational stability and service life. Consistency of the battery module is given more consideration.
Different emphasis on battery performance, different performance and design. Energy storage batteries mainly store electrical energy and do not fluctuate as much as power batteries when supplying power to the outside world. Energy storage batteries can be considered a more stable output, generally small discharge current and long discharge time.
Energy storage batteries can be used in power peaking, off-grid photovoltaic energy storage or user-side peak-valley spread energy storage scenarios, which generally require continuous charging or continuous discharging of the storage battery for more than two hours, so it is suitable to use the capacity-type batteries with a charging and discharging multiplication rate of ≤ 0.5C; for the power FM or smoothing of fluctuations in renewable energy energy storage scenarios, it requires fast charging and discharging of the storage battery in the second-minute interval, so it is suitable for the application of the ≥ 2C power type battery application.
Compared with the power lithium batteries, lithium batteries for energy storage have higher requirements for service life. The life of new energy vehicles is generally about 8 years, while the life of energy storage projects are generally expected to be more than 10 years. The cycle life of lithium power battery is about 2000 times, while the cycle life of lithium energy storage battery is generally required to be greater than 2000 times.