Connecting 21700 batteries with aluminum alloy anode

[Septagon]

Has anyone have experience with either spot welding or ultrasonic welding to form a battery pack using batteries with a aluminum alloy based anode. the cathode is no problem spot welding with a conventional spot welder but the anode will not reliably keep the connection. It eventually weakens or never makes a good connection and fails . Does anyone have a solution using ultrasonic or maybe a compression technique to form a reliable battery pack with these batteries that don't have a steel based anode?
Please any suggestions.

 

[amberwolf]

You might check some of these:
https://endless-sphere.com/forums/search.php?keywords=weld*+alumin*&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search
don't know if they have what you want; you'll have to look.