At present, square aluminum shell batteries are widely used in the field of new energy vehicles power battery, square lithium battery packaging performance is good (suitable for laser welding machine welding),battery pilot line the energy efficiency and stability of the system is relatively good, effectively solving the new energy vehicle virtual welding and battery capacity conflict, and then introduced the lithium battery laser welding square aluminum shell lithium battery principle and advantages.
1. Square aluminum lithium battery laser welding principle
Lithium-ion power battery system consists of a more complicated, the main contents include positive / negative pole pole, diaphragm, electrolyte, collector and binder, conductive agent, etc., involving the reaction ability including positive and negative electrode electrochemical reactions, ionic conduction and electronic information conduction mechanism,laser welding machine for lithium ion batteries as well as the diffusion of heat generation.
Lithium-ion batteries are prepared by mixing the active substance, binder, and conductive agent to form a slurry, which is then coated on both sides of a copper or aluminum collector. After drying, the solvent is removed to form a dry plate,ESS lithium battery machine and the granular coating is compacted and densified, then cut or sliced. The positive/negative electrodes and diaphragms are then assembled to form a battery pack, which is packaged and filled with electrolyte, then charged and discharged for activation, and finally formed into a battery product. According to the shape of the core pack, they can be categorized into square, cylindrical and flexible batteries.
Traditional packaging technology can not meet the sealing and stability of square aluminum pack lithium batteries, and the use of laser welding machine for square aluminum pack lithium battery welding and packaging, the effect is very good. Lithium battery laser welding machine's high-energy laser irradiation of aluminum batteries, battery surface materials instantly melted, molten aluminum alloy material absorption efficiency is rapidly increased. The energy absorbed by the surface of the molten aluminum alloy liquid melts the deep aluminum alloy of the splicing parts through heat conduction, the lithium battery shell and the corresponding lithium battery shell cover plate quickly fused, the weld is beautiful and solid, the weld surface is flat, the welding effect is self-evident.
2. Advantages of laser welding lithium batteries
Square aluminum lithium battery welding position is mainly aluminum-manganese alloy, aluminum and manganese boiling point is not much difference. When the laser of the laser welding machine irradiates the surface, it will not produce problems such as large weld, uneven weld and unstable weld due to the combustion of metal elements. The welding quality is very stable by using Haiwei gantry vibrating mirror laser welding machine for automatic continuous welding.
Square aluminum shell lithium battery pick laser welding machine exists must pay attention to the manufacturer's R & D and innovation and welding machine equipment stability, need to have a red light preview or CCD monitoring system function, fast programming function, to ensure that the precision of welding and automation technology efficiency, to have China's advanced scientific and efficient continuous use of the laser welding output, high-precision motion module, welding speed fast at the same time, in order to ensure that the accuracy of the data and the Welding work quality.
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