In the production of lithium batteries must be noticed when what matters

In the production of lithium batteries when must notice what item, lithium batteries in the production process? About this we guangdong lithium battery manufacturer to tell you now! A purpose, process no matter in the winding or Z fold, must exert a certain tension on the diaphragm, in order to ensure positive plate, diaphragm, neat degree between the cathode piece, however, the technological process of tension can make the diaphragm in tape direction elongated, the diaphragm shrinkage is very big, at the direction of tape will make serious extrusion sheet diaphragm, which leads to batteries after assembly process, especially the coiling process, deformation of batteries, batteries after deformation is not only appearance smoothness is poor, also exist inside the diaphragm defects such as fold, as shown in figure 1 and figure 2, which leads to low capacity, fast cycle performance is poor and self-discharge of quality problem, especially the winding of the thicker batteries, especially after the winding deformation problem. In addition, the thickness of loose state of batteries consistency is bad, will affect the batteries into the shell process, increase the difficulty of the process into the shell, and even lead to cell damage into the shell. Batteries, therefore, the main purpose of the hot plastic include: ( 1) To improve the planeness and evenness of the lithium ion battery, make batteries meet the requirements and have high consistency of thickness; （ 2) To reduce the diaphragm fold, internal air out of the batteries, the diaphragm and is negative pole piece tightly stick together, shortening the distance between the lithium ion diffusion, reduce the battery internal resistance. Second, the process in order to make the lithium-ion battery batteries can recover after plastic flat and avoid retraction. Batteries hot pressing shaping process is as follows: put the winding or laminated good batteries on the template, set the pressure cylinder pressure and temperature, templates and template under certain pressure and temperature is up and down the batteries to finalize the design, to achieve the thickness of the batteries is consistent, reduce cell elasticity, reducing loading core qualified rate and ensure the consistency of the thickness of the finished batteries. For square cells, hot pressing shaping device as shown in figure 3, from top to bottom template is flat, smooth flat clamping batteries under pressure. For cylindrical battery, hot pressing shaping device as shown in figure 4, on the base to produce two cylinder relative to one another, the two cylinder piston rod end with two semicircle model of cylindrical tank, two semicircle model equals the radius of cylindrical tank and is equal to or less than the default volume core radius. Using manipulator or fixture clamping roll core is placed in the center of the two semicircle model, the mould clamping the two cylinder to drive two semicircle relative to one another, making two semicircle die extrusion of roll core and the winding plastic to preset size, to allow into the matching of the enclosure. Three, the key points of technology batteries, main technological parameters of thermal plastic have pressurized pressure, pressure time and temperature of the template. Under appropriate process parameters, the thick batteries almost non-existent internal air, the diaphragm and the pole piece close together, loose batteries can become lumps. But, for the use of ceramic membrane in recent years, because of the ceramic layer exists, the diaphragm to pole piece together to form this kind of state. In the process to determine the test, check the project including the membrane permeability, thickness change; The thickness of the batteries if they meet the requirements of the shell; If pole piece break, etc. About lithium battery production process is introduced to here oh, if you have other want to know about can focus on our lithium battery manufacturer!