Research On Automation Technology Of Aluminum Plastic Film Packaging For Lithium-ion Power Battery

As one of the most important parts of lithium-ion battery production,battery aluminum-plastic film packaging process' s technical quality determines battery product's final quality.Currently,domestic battery aluminum-plastic film packaging process is mainly based on traditional manual or semi-automated producing methods,which suffers from poor product consistency,low assembly accuracy,and unstable battery quality.This thesis analyzed and researched on the processing technology and automation equipment of battery aluminum-plastic film packaging process,and designed a new type of automation equipment having good production consistency and high efficiency.1.The overall program of automatic packaging equipment for lithium-ion battery aluminum-plastic film process was designed.The existing production conditions and the requirements of automated production process were analyzed.By using modular design method and independence axiom,the equipment was divided into feeding module,stamping module,cutting module,circulation module,assembling module and heat sealing module,and the overall program was determined.2.The structure of each module of the equipment was designed in detail.The concrete structure of the six main modules were designed respectively.At the same time,the module size and process parameters of the stamping module were calculated in detail.3.The aluminum plastic film stamping process has been investigated and optimized.Through tensile tests,the characteristics of aluminum-plastic film were analyzed,and the stamping process of aluminum-plastic film was simulated.Orthogonal experiments were conducted to analyze the process parameters affecting the formability of the aluminum-plastic film,and the most influential parameters on the aluminum-plastic film were obtained,The response surface method,Latin hypercube test and the combination of multi-objective particle swarm optimization algorithm were used to optimize the significant parameters.Optimized aluminum-plastic film forming process has the thinnest shell with a thickness of 0.057 mm.Using the optimized parameters,the punching experiment was carried out,which proves that it is feasible to optimize the stamping forming process of aluminum-plastic film.4.The heat sealing performance of aluminum-plastic film was studied and analyzed.The thermal conduction mechanism of the aluminum-plastic film was analyzed,the heat conduction model was established and solved.The relationship between the inner layer's temperature of the aluminum-plastic film and the sealing temperature and the sealing time was obtained.The simulation results show the rationality of the heat-conductive heat conduction model of the aluminum-plastic film.The effects of the heat-sealing temperature,the heat-sealing time,the heat-seal strength and the structure of the silica gel on the heat-sealing performance of the aluminum-plastic film are further simulated.Finally,through heat-sealing performance tests,the influential factors on heat-sealing strength,including the sealing temperature and sealing time were studied.