Process Research And Structure Optimization Design Of Lithium-ion Battery Automatic Casing

As pressure increzsing of energy shortage and environmental protection consciousness,the large capacity power battery gradually become the subject of power supply. In the2010vision program planning of our country, lithium battery equipment was listed as a priority tothe development of products, and is one of the key to industrial development. Traditionallithium-ion battery casing equipment has a lot of shortcomings, such as low productionefficiency, labor intensity and poor consistency of battery product, so it is difficult to meet thehigher requirements of power battery. Compared with the traditional lithium-ion batterycasing equipment, lithium-ion battery automatic casing equipment has a lot of advantages,such as high production efficiency, the intensity of labor is low, good consistency of batteryproduct and stable performance, so it is one of the important ways to improve the quality oflithium-ion battery products. Process research and structure optimization design oflithium-ion battery automatic casing is the basis of the lithium-ion battery automatic casingequipment development, and it is of great significance to improve the quality of casing andreduce the equipment R&D and manufacturing cost.In this paper, casing process and the key mechanism of automatic casing equipment oflithium-ion battery were researched by means of theoretical analysis, finite element numericalsimulation and experimental research. The main research contents and conclusions of thispaper are summarized as follows：1. Blanking finite element analysis model of non-metallic material PET insulation spacerwas built, and the influence rule of blanking process parameters on blanking quality ofinsulation spacer was discussed. Results show that reasonable blanking clearance andincrease blanking speed can improve cross section quality and dimensional accuracy ofblanking pieces, and reduce bending degree of blanking pieces.2. According to principle of heat transfer and difficulty of heating mechanism finiteelement modeling, the finite element analysis model of heating mechanism was built. Withinstallation size of heating pipe as optimization object, uniformity of temperature and averagetemperature of heating mechanism as optimization goals, the heating mechanism wasdesigned by using orthogonal experiment and grey correlation degree optimization method, and optimal design parameters of heating mechanism were obtained.3. According to principle of heat transfer and difficulty of rubber sac heating finiteelement modeling, finite element analysis model of rubber sac heating was built, and theinfluence rule of heating temperature and rotational velocity on rubber sac temperature wasanalyzed. Results show that with increase of heating temperature, uniformity of rubber sactemperature become worse. With increase of rotational velocity, uniformity of rubber sactemperature become batter, but when rotational velocity increases to a certain extent, it is notobvious to improve the uniformity of rubber sac by continuing to increase rotational velocity.4. Insulation spacer blanking and rubber sac heating shrinkage were researched byexperiment method. Results show that compared with the heating mechanism which isn’toptimized, the optimal heating mechanism is easier to control heating temperature forqualified products, and types of shrinkage defects is reduced. The process parameters ofinsulation spacer blanking and rubber sac heating are feasible, which were obtained bynumerical simulation analysis. Based on these process parameters, the qualified insulationspacer and final casing product were obtained by experiment research.