Abstract: The optimization research for the inerting device is to solve the problem that the dust inerting device of lithium battery always forms material arch, which can not guarantee the safety of lithium battery production. Based on the analysis of the main structure and working principle of the inerting device system and the established mathematical model of silo pressure of the conveying system, the influence of silo pressure on inert powder conveying and discharging rate was studied. Combined with the influence and search optimization algorithm, the size range of the discharge port was determined. The optimization method of the pneumatic arch-breaking device is derived from the arch-breaking mechanism revealed by the numerically simulated and analyzed of the pneumatic arch-breaking auxiliary powder feeding device. The results showed that according to the calculation and experimental analysis results, the higher the silo pressure is, the more difficult it is to transport inert powder. The maximum amount of inert powder added in a single time is 3.6 kg in the original structure, and the device with the improved outlet size of 89 mm is up to about 20 kg. Compared with the single nozzle, the arch-breaking effect of the new double inclined nozzle is improved by 30.9%. The optimized inerting device has no interruption of powder feeding, and the amount of inert powder can be up to 25 kg per time, and the amount of powder feeding per hour fluctuates between 0.16 kg and 0.37 kg.

Key words: lithium battery dust, inert powder, powder conveying, silopressure, pneumatic arch-breaking