CONTEXT

When realizing battery pack, it is important to have mechanical contacts between current collectors. Welding of thin copper and aluminum electrode isn’t possible due to the large difference between their respective melting point (around 600°C).

TECHNICAL DESCRIPTION

The invention relates to a specific welding process (called MIG CMT) allowing the welding between two thin plates of copper and aluminum.

In the above figure, we can see the welding with (from left to right), aluminum electrode, welding zone and copper electrode

DEVELOPMENT STAGE
Over 30 tests were done with good reproductibility without specific optimization of the process. Analysis demonstrates the welding between Al/Cu.

In addition, preliminary tests demonstrate a good resistance to vibrations and a normal use of the welded cells.
Future development are ongoing for welding the electrode in end to end relation.

INDUSTRIAL APPLICATIONS
Pack manufacturing

For further information, please contact us (Ref 05200-01)