Power type lithium ion battery cover and welding process thereof
A power-type, lithium-ion technology, applied in welding equipment, battery pack components, circuits, etc., can solve problems affecting the service life of lithium-ion batteries and the overcharge and overdischarge performance, the easy damage of the upper cap coating, and the fusion area of solder joints. Small and other problems, to increase the number of cyclic charge and discharge, no hidden danger of explosion, and improve the capacity of the finished battery
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[0018] The present invention will be further described below in conjunction with the drawings and embodiments.
[0019] figure 1 , 2 As shown, a lithium-ion power battery cap includes an upper cap 1, a gasket 2, an explosion-proof membrane 3, an orifice plate 4, and a sealing ring 5. The upper cap 1 is provided with a plurality of air holes, the upper cap 1, the gasket 2, and The explosion-proof membrane 3 is wrapped by the bend wall 51 of the sealing ring 5 and embedded in the outer ring of the sealing ring 5. The bottom surface of the inner ring of the sealing ring 5 is embedded with the orifice plate 4, which is a circular welding platform for the orifice plate 4 and the explosion-proof membrane 3. 32 Laser spot welding, the upper cap 1 is evenly provided with two or more downwardly convex solder joints 11 on the lower surface of the cap edge. The height of the solder joints 11 is greater than the thickness of the gasket 2. The upper cap 1 is welded by more than two convexes P...
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