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Battery pole plate manufacturing process
According to the form of lithium battery can be divided into cylindrical battery, square aluminum shell battery, soft package battery, blade battery, etc., the production process has certain differences, but the overall lithium battery manufacturing process can be divided into the front stage of the process (electrode manufacturing), the middle stage of the process (cell synthesis), the back stage of the process (packaging).
This article will focus on the lithium battery manufacturing process before the process. The production goal of the preceding process is to complete the manufacturing of (positive and negative) pole pieces. The main processes of the preceding process are: pulping/stirring, coating, rolling, slaying, die-cutting.
Pulping/stirring
Pulping/stirring is to mix the positive and negative solid battery materials evenly and then add solvent and stir into a slurry. Slurry mixing is the beginning point of the previous process, and is the foundation of the subsequent coating, roller and other processes.
The slurry of lithium battery is divided into positive slurry and negative slurry. The active substance, conductive carbon, thickener, binder, additive, solvent and so on are put into the mixer in proportion, and the evenly dispersed solid-liquid suspension slurry is realized by stirring to facilitate coating. High quality stirring is the basis of high quality completion of the subsequent process, which will directly or indirectly affect the safety performance and electrochemical performance of the battery.
coating
Coating is to coat the positive active material and the negative material on the aluminum foil and copper foil respectively, and combine the conductive agent and the binder to form the electrode sheet. The solvent was then removed by oven drying so that the solid material was bonded to the substrate to make positive and negative electrode sheet rolls.
Positive and negative coated
Cathode material: it is divided into layered structure, spinel structure and olivine structure, corresponding to ternary materials (and lithium cobalate), lithium manganate and lithium phosphate.
Negative electrode materials: Currently, the negative electrode materials used in commercial lithium-ion batteries mainly include carbon materials and non-carbon materials. Among them, carbon materials include graphite anode, which is the most used at present, and disordered carbon anode, hard carbon, soft carbon, etc. Non-carbon materials include silicon-based cathode, lithium titanate LTO, etc.
As the core part of the previous process, the execution quality of the coating process profoundly affects the consistency, safety and life cycle of the finished battery.
Roll pressure
The coated electrode is further compacted by roller pressing, so that the active material is in close contact with the collector, the moving distance of the electron is reduced, the thickness of the electrode is reduced, and the loading amount is increased. At the same time, the internal resistance of the battery is reduced to improve the conductivity, and the utilization rate of the battery is improved to improve the battery capacity.
The leveling degree of the electrode sheet after roller pressing will directly affect the processing effect of the subsequent cutting process, and the uniformity degree of the active substances in the electrode sheet will indirectly affect the performance of the battery core.
slitting
Slitting is the continuous longitudinal cutting of a wide whole reel of polar pieces into a number of narrow pieces of desired width. In the process of cutting, the pole piece suffers from shear fracture failure, and the edge smoothness (no burr, no buckling) after cutting is the key to evaluate the performance.
Die-cutting
Die-cutting is the coating after the polar plate punching molding, for the subsequent process.
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