This project adopts cymbals specially welded low dew point rotary dehumidifier -- outdoor dehumidifier, which is applied to the laboratory of battery drying room. The environmental control requirements in the workshop are as follows: the temperature is 23±1℃, the dew point is ≤-50℃, and the cleanliness level is 100,000. This equipment adopts the form of all-welded structure with good sealing, which can ensure to meet the production process requirements and effectively reduce the running energy consumption. At the same time, because the equipment is placed in the outdoor, the top of the equipment is equipped with a rain-proof device, such as the new air port adopts the rain-proof plate + protection screen plate, the electrical box adopts the better protection level of the internal and external doors, the regeneration system is the use of rain-proof box structure form, better protection of the unit regeneration system internal parts rain-proof performance; In the cold section of the equipment, the probe detection hole is also added, and the temperature, humidity, air volume, wind speed and other actual operating technical parameters of the system can be detected during the operation of the equipment. The unit can run continuously for a long time without wearing parts that need to be replaced frequently.