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In the medium and long term, with the further reduction of manufacturing costs caused by large-scale production, the accelerated maturity of battery recovery technology and industry, and the guarantee of relevant raw material resources, it is expected that the cost of lithium battery will generally decline.

6. Energy conversion efficiency of lithium energy storage system: 89%

Compared with other new energy storage technologies, lithium battery energy storage system has outstanding advantages of high energy conversion efficiency. In 2022, the energy conversion efficiency of lithium energy storage system in China will be about 89%. With the continuous improvement of technical level, the energy conversion efficiency of lithium battery energy storage system will be improved.

7. Single cell capacity of lithium energy storage battery: 150~280Ah

Take lithium iron phosphate battery as an example. At present, there are 150Ah, 160Ah, 210Ah, 240Ah, 280Ah and other different capacities used in electric energy storage power stations. At present, more than 10 domestic appliance core enterprises have sold their 280Ah lithium iron phosphate battery products.

The improvement of cell capacity can reduce the use of parts and improve the bulk density of the module at the level of the battery module. It can also simplify the subsequent assembly process of the module and save the cost of land infrastructure, containers and other aspects.

However, the heat dissipation problem of large-capacity battery core is more serious, and once an accident occurs, the energy released will be greater. It is expected that the capacity of single cell of lithium battery will be slowly increased in the future, and the balance between cost, capacity, high safety, long life and other performance will be sought.

8. Cycle life of single cell of lithium energy storage battery: about 6000 times

The application scenario of energy storage puts forward higher requirements for the cycle life of lithium batteries. If the peak load is adjusted at 0.5C system rate (i.e., the charge/discharge duration is 2h) and the charge/discharge cycle is twice, the 10-year service life of the lithium energy storage power station corresponds to the cycle life of the energy storage battery of 7300 times (the actual cycle life of the battery cell is more than 7300 times), which is far more than the cycle life of the power lithium battery of about 1000 times.

In 2022, the cycle life of lithium battery cell in China will be about 6000 times; With the rapid improvement of technical level, it is expected to reach 10000-20000 times in the future.