Laser welding has proven itself at several points of the battery cell production process. The films stacked inside the battery cell can be joined by using a laser process. The connection of the film stack to the pole contacts can also be achieved by using a laser welding process.
The housing of the prismatic battery cell is closed by a seal weld. For this purpose, a lid is placed into the can and it is welded with exactly coordinated process parameters. The sealing plug is, in turn, welded by a laser after filling the battery cell with an electrolyte solution.