Laser Welding Process of Prismatic Lithium Battery
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During the manufacturing and assembly process of prismatic aluminum shell lithium batteries, a large number of laser welding processes are required, such as: welding of soft connections of battery cells and cover plates, cover plate sealing welding, sealing nail welding, etc. Laser welding is the main welding method for prismatic power batteries. Due to its high energy density, good power stability, high welding precision, easy systematic integration and many other advantages, laser welding is irreplaceable in the production process of prismatic aluminum shell lithium batteries. Acey provides -W automatic cnc laser welding machine with fiber laser generators as options, and also accepts OEM&ODM Service.
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Detailed explanation of lithium-ion battery production process:
The structure of lithium battery is divided into five parts, namely positive electrode, negative electrode, separator, electrolyte and casing.
(1) The positive electrode of lithium battery contains active materials, conductive agents, solvents, binders, matrix and other substances.
(2) The negative electrode of lithium battery contains active materials, binders, solvents, matrix and other substances.
(3) Lithium battery separator
(4) Lithium battery electrolyte
(5) The lithium battery shell includes steel shell, aluminum shell, cover plate, pole tab, insulating tape and other hardware.
Lithium battery production process flow chart:
Objectively speaking, the lithium battery production process is divided into three major sections, one is pole piece production, the other is cell production, and the third is battery assembly. In the lithium battery production process, pole piece production is the foundation, battery core production is the core, and battery assembly is related to the quality of the finished lithium battery. The specific steps of the lithium battery production process include positive electrode slurrying, negative electrode slurrying, positive electrode sheets, negative electrode sheets, steel case assembly, liquid injection and testing, and packaging.
For square aluminum shell lithium batteries, welding is a very important manufacturing process in cell production line to battery pack assembly line. The conductivity, strength, air tightness, metal fatigue and corrosion resistance of lithium batteries are typical of battery welding. Quality evaluation criteria. The selection of welding methods and welding processes will directly affect the cost, quality, safety and consistency of the battery. Among many welding methods, laser welding stands out with the following advantages.
The battery laser welding equipment developed and produced by Acey has high laser welding energy density, small welding deformation and small heat-affected zone, which can effectively improve the accuracy of the parts. The welds are smooth, impurity-free, uniform and dense, without additional grinding work, and can be precisely controlled. The focused light spot is small, high-precision positioning, and it is easy to realize automation with the robot arm, which improves welding efficiency, reduces working hours, and reduces costs.
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