Wet-method lithium battery diaphragm back cooling process

The invention discloses a wet-process lithium battery diaphragm back cooling process. The process comprises the following steps: A, cleaning and filtering air adopted for back cooling, and pressurizing to send out clean high-pressure air; b, the clean high-pressure air is cooled into cooled clean high-pressure air at the set temperature; c, quantitatively distributing the cooled clean high-pressure air and supplying the cooled clean high-pressure air to each air inlet pipe of the back cooling cover assembly; d, each air knife of the back cooling cover assembly blows out quantitatively distributed cooling clean high-pressure air to the back surface of the diaphragm; and E, the industrial waste gas treatment device extracts the industrial waste gas containing oil smoke released when the back face of the diaphragm is cooled from an exhaust outlet of the back cooling cover assembly, and the industrial waste gas is discharged into the atmosphere after standard treatment. According to the process, the cooling effic