Design And Research Of Key Mechanism And Control System Of Casing Machine Used For Lithium-ion Power Battery

Lithium-ion battery, as a new kind of power storage with the advantages of high energy,good discharge characteristic, non-pollution etc., is an ideal source of the electrical vehicles.Lithium-ion battery casing machine is the equipment to case the lithium-ion battery with aheat shrinkable plastic hose, in order to package and protect the battery, and shrink the hole tocover the lithium-ion battery tightly through heating. At present, most of domestic lithium-ionbattery casing machines are the manual and semi-automatic equipment, with low productionefficiency and bad production quality and conformity, and the machines are just only suitablefor the conventional batteries, which are difficult to satisfy the production requirement of thelithium-ion batteries.The structure of the key mechanism in casing machine was designed and optimized inthis paper by combining with the casing process of lithium-ion battery and with the method ofcombining with theoretical analysis and finite element numerical simulation, and theautomatic control system were designed, and the automatic control of casing machine wasachieve. The main research contents and conclusions of this paper are summarized as follows:(1) Taking the18650cylinder lithium-ion battery casing machine as the research object,the structure and function of each mechanism and the whole casing process were analyzed,and the general design scheme was put forward, and the foundation for the design of the keymechanism and control system in lithium-ion battery casing machine was established.(2) According to the casing process flow, the casing mechanism was designed by UGsoftware, which includes of casing device, cutting device and correcting clamp; then thefeeding process was simulated and the structure of center shaft was optimized through thefinite element software MARC; the3D model of casing mechanism was built according to theoptimized results, and the kinematics simulation of the mechanism was made by the ADAMSsoftware, which verified the reasonability of the structure.(3) According to the control requirement of each mechanism in the machine, thehardware part of the control system of lithium-ion battery casing machine was designed; theelectric and pneumatic control system were designed, achieving the driving of eachmechanism; the distribution of each sensor was designed, and the conditions of batteriesfeeding, hole casing and spacer placing, etc. were detected by using photoelectric sensortechnology and optical fiber sensing technology so that the detection signal can be sent to thecontrol system; then each part of the casing machine is controlled by the control system andthe defective batteries are pushed out by the defective battery pusher; the type of PLC and the distribution of input and output were designed according to the requirement of control.(4) Combining with the detection signals of sensors, encoders, magnetic switches, etc.,the control flow of PLC control system were designed to control the servo motor, adjustablespeed motor, three-phase induction motor, touching screen and cylinder; the control programwas written through the GX Developer software; and the man-machine interface was designedfor the convenience of monitoring the equipment and the inputting of parameters.