In the context of low-carbon development, new energy has become the main direction of global development. With the dual harvest of energy storage and new energy vehicle production and sales in China, the demand for lithium batteries continues to rise. At the same time, with the rapid development of industries such as mobile phones, electric vehicles, photovoltaic solar energy, electric tools, digital cameras, and household energy storage, the demand for lithium batteries will continue to grow. The development prospects of the concept of lithium batteries are very promising.
The main differences between power batteries and energy storage batteries are different battery capacities, different application scenarios, different Battery management systems BMS, different types of battery cells, and different performance and design.
The power battery is mainly used to provide power for driving tools and rotating motors. It is mainly used in electric vehicles, electric trains, electric logistics vehicles, electric two-wheeled vehicles, tricycles, four-wheel vehicles, golf carts, electric carrying and loading vehicles, Electric boats, and unmanned electric tools, such as drones, lawnmowers, electric toy cars, and unmanned electric Cart.
Energy storage batteries are mainly used in power stations, communication base stations, household energy storage, portable power sources, etc. for solar and wind power generation equipment, as well as batteries for renewable energy storage.
Power batteries are limited by the size and weight of cars, starting acceleration, and occasionally providing high currents for mountain climbing. Therefore, they have higher performance requirements than energy storage batteries, and pay more attention to charging and discharging power. They require fast charging rates, high output power, and impact resistance, especially high safety and energy density, achieving long-lasting endurance, and lightweight requirements in terms of weight and volume. From the perspective of battery materials, it is necessary to consider the lithium storage performance of positive and negative electrode materials, as well as the related performance of electrolytes and separators.
The energy storage battery device does not need to be moved, and the power and density requirements vary in different energy storage scenarios. The weight and volume are generally not too high. The preparation of energy storage batteries emphasizes battery capacity, especially operational stability and service life. More consideration should be given to the consistency of battery modules. In terms of battery materials, in order to pursue the long lifespan and low cost of the entire energy storage equipment, attention needs to be paid to the expansion rate, energy density, performance uniformity, and other aspects of the electrode material.
The focus on battery performance varies, and the performance and design also vary. Energy storage batteries mainly store electrical energy and do not fluctuate as much when supplying power to the outside world as power batteries. Energy storage batteries can be considered to have a relatively stable output, generally with a small discharge current and a long discharge time.
Energy storage batteries can be used in power peak shaving, off-grid photovoltaic energy storage, or peak valley price difference energy storage scenarios on the user side. Generally, the energy storage battery needs to be continuously charged or discharged for more than two hours, so it is suitable to use capacity-type batteries with a charge-discharge rate ≤ 0.5C; For energy storage scenarios with power frequency modulation or smooth fluctuations in renewable energy, it is necessary to quickly charge and discharge the energy storage battery in a time range of seconds to minutes, making it suitable for applications of ≥ 2C power type batteries; In some application scenarios that require both frequency modulation and peak shaving, energy-based batteries are more suitable. Of course, in this scenario, power-based and capacity-based batteries can also be used together.
Compared to power lithium batteries, energy storage lithium batteries have higher requirements for their service life. The lifespan of new energy vehicles is generally around 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 around 2000 times, while the cycle life of energy storage lithium batteries is generally required to be greater than 2000 times.
The scale of energy storage power stations is basically at the level of megawatts or even hundreds of megawatts, so the cost of energy storage lithium batteries is required to be lower than that of power lithium batteries, and the safety requirements are also higher.
Some people vividly compare power batteries to generators, and energy storage batteries are equivalent to converters. There are some differences between Lithium iron phosphate power batteries and energy storage lithium batteries. Lithium iron phosphate batteries and ternary lithium batteries are used. However, there are some differences in the shape of the core. The shape of the core is mainly a Lithium iron phosphate cylinder, a square core, and a soft core.
At present, cylindrical Iron(III) phosphate lithium battery cells are widely used in energy storage, and power batteries are mainly used by Tesla Motors, some domestic two-wheeled vehicles, tricycles, and new energy vehicles. The main reasons are that the heat dissipation effect is good, the battery metal shell has high compression resistance, and the heat pipe has an unusually good heat dissipation effect. It can obtain high bending strength, and the monomer unity is relatively good. Single-cell energy is small, and the form is easy to control. Cylindrical batteries are usually sealed batteries, and there will be no maintenance issues throughout the operation process.
The main difference between them is that the BMS Battery management system can realize the power response speed and power characteristics, SOC estimation accuracy, and charging and discharging characteristics of the battery on the BMS.
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