Storage battery protection system

The invention provides a storage battery protection system which comprises a gate assembly which comprises a gate body and a gate support which are oppositely arranged on the inner wall of a vent hole; the optical detection device comprises a first optical detection assembly and a second optical detection assembly which are arranged on the inner wall of the vent hole; and the gate driving device is in driving connection with the gate body and is in communication connection with the optical detection device, so that the gate body is controlled to be in contact with or away from the gate support according to the light receiving condition of the optical detection device. According to the scheme, when water enters the storage battery, the light transmittance between the first optical detection assemblies is reduced, the gate driving device drives the gate assembly to make contact with the gate support, and therefore the purpose of preventing water from entering the storage battery is achieved; and when too much g