The production process of lithium battery mainly includes: I. Pole plate project - mixing slurry coating and baking, roller pressure slitting, laser die-cutting and slitting; II. Assembly project - winding, JR preheating short-circuit test, pairing, welding, vacuum drying; III. Chemistry project --Liquid injection, high-temperature static, chemical formation, welding, core charging and discharging, aging test, laminating. Among them, the pole plate project in the mixing pulp and coating process will produce a large number of NMP exhaust, the part of the exhaust gas concentration is relatively high, large air volume, solvent components of a single recovery and reuse value is high, usually is the use of rotor recycling + depth of treatment or absorption tower recycling + distillation + depth of treatment of the treatment process, this part of the exhaust gas treatment technology is more mature. The difficulty lies in the assembly process and chemical process of liquid injection and vacuum drying VOCs generated by the exhaust gas, the part of the exhaust air is relatively small, the concentration fluctuations and contains tar, this part of the exhaust gas is either not recognized or the use of activated carbon or alkali washing and other simple treatment processes, not only maintenance operations are cumbersome and easy to discharge exceeded the standard.