High precision laser welding can significantly improve the car battery safety, reliability and service life, will bring about revolutionary progress for future automotive propulsion technology. Battery laser welding, resistance to pressure and leakage testing requirements, most of the material of aluminum, so difficult for welding, the welding process more demanding.
In General, the welding of the battery housing are mainly for welding and welding in two ways, each of them has advantages and disadvantages, and particularity of aluminium batteries because of their materials, raised, stomata, cheaters, or problems easier, square battery welding problems at the corner.
Welding technology of battery problems
General shell thickness is 1.0 mm required, mainstream manufacturers currently shell thickness depending on the battery capacity 0.6mm and 0.8mm two. Welding is mainly divided into lateral welding and welding, the main advantage of one side welding is less impact on the batteries inside, spatter does not easily enter the inside of the housing cover. After welding may cause raised, this Assembly of the follow-up process will be slightly affected, so the lateral stability of the laser welding process, materials of cleanliness and top cover and shell of high clearance requirements. Top welding because welding in a plane, more efficient scanning welding mode can be used, but before the operation into the shell and the demanding, high automation requirements of equipment.
Welding aluminum power battery problems
Battery aluminum shell accounted for more than 90% of the entire battery. Laser welding of aluminum is difficult to face welding scar surface problems, pore problems, fried fire problem, inside the bubble problem. Surface, within the pores, bubbling is the Achilles ' heel of laser welding, many applications for these reasons had to stop or try to avoid. Many battery manufacturers in the early research and development will be a lot of worry, the reason, are mainly fiber core diameter is too small or laser power setting being too high. Cause fried fire (also known as splash, Splash) too many factors, such as the cleanliness of the material, the material itself purity and characteristics of the material itself, and plays a decisive role is laser stability. Battery soldering, welding technicians will be based on the customer's battery materials, shape, thickness, tensile requirements for choosing the right laser and welding parameters, including the welding speed, wave, peak, the welding head tilt angle to set proper welding parameters, to ensure that the final result meets requirements of battery manufacturers
Welded square power battery problems
Square cell materials combined with factors such as accuracy, welded corners it is most prone to problems, need to be based on the actual situation and constantly explore, adjust the welding speed can solve such problems. Round batteries do not have this problem, but subsequent integration into battery module is difficult.