Solar energy storage system and method

Abstract

The invention relates to a solar energy storage system comprising a solar panel, a switching unit, a storage battery pack, a detecting unit and a controller. The solar panel is used for transforming the solar energy into the electric energy; the switching unit is used for switching the charging mode of storage batteries in the storage battery pack; the storage battery pack is used for storing the energy; the detecting unit is used for detecting the charging voltage of the solar panel and the open-circuit voltage of the storage battery pack; and the controller is used for controlling the switching unit to be switched into the corresponding charging connecting circuit to charge the storage battery pack with the corresponding charging mode according to the detection result of the detecting unit. The requirement of the storage battery pack for the charging voltage can be reduced when the intensity of the sunlight is not high enough, thus the storage battery pack can still be charged, and the utilization rate of the solar energy can be improved effectively. The invention also relates to a solar energy storage method.

Description

technical field [0001] The present invention relates to an energy storage system and method, in particular to a solar energy storage system and method. Background technique [0002] With the advancement of science and technology, solar energy has been widely used in all aspects of production and life. Since the application of solar energy is affected by factors such as weather and light intensity, the output of electric energy directly obtained by photoelectric conversion is extremely unstable. Therefore, the solar energy storage system generally stores the electric energy obtained by solar photoelectric conversion in a battery pack first, and then The electric equipment is powered by the battery pack, so that a stable supply of electric energy can be realized. [0003] However, directly using the electric energy generated by the solar panel to charge the battery pack is also greatly affected by the intensity of sunlight. If the intensity of sunlight is high, the charging v...

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Problems solved by technology

[0003] However, directly using the electric energy generated by the solar panel to charge the battery pack is also greatly affected by the intensity of sunlight. If the intensity of sunlight is high, the charging voltage provided by the solar panel will be high; The charging voltage is lower

However, the batteries in the existing battery packs all adopt a fixed charging connection method, which greatly restricts the application of solar energy storage systems. For example, charging battery packs in series requires a higher input voltage. If the input voltage of the storage battery is insufficient, it is easy to cause insufficient charging and reduce the utilization rate of solar energy; the parallel charging of battery packs has lower requirements on the input voltage, but the voltage difference between the storage batteries may lead to reverse flow between the storage batteries. charging phenomenon, so the charging efficiency is low

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