- With the maturity of lithium battery technology, lithium batteries have a wide range of applications in the field of energy storage, which has a lower price, higher durability, longer service life and stronger protection level. In the photovoltaic field, it is connected with photovoltaic modules to store excess power generation during the day for use at night, providing stable power to underdeveloped areas of the grid. In areas where the price difference is relatively large, it can be used to store electricity in lithium batteries at low prices and use them at expensive times.