Energy storage spot welding pen test

What is resistance spot welding?

Resistance spot, ultrasonic or laser beam welding are mostly used for connecting battery cells in the production of large battery assemblies. Each of these welding techniques has its own characteristics depending on the material properties and contact geometry. Cell casing and terminal dimensions may constrain possible contact geometries.

What parameters are changed during a spot-welding process?

The three primary spot-welding process parameters that are changed are welding time, welding current and electrode force. The welding time during RSW is very short, it varies between micro- and milliseconds. Too short of a welding time or a low applied electrode pressure may provide insufficient surface contact and lead to a poor weld.

Can a battery spot welder be used as a power supply?

Commercial battery spot welders do a good job but have a huge inrush current and aren’t cheap, so it’s not uncommon to see improvised solutions such as rewound transformers taken out of microwave ovens. There’s another possibility though, in the form of cheap modules that promise the same results using a battery pack as a power supply.

What are the different welding techniques for batteries?

The purpose of this project is to conduct a comparative literature study of different welding techniques for welding batteries. The compared techniques are resistance spot welding, laser beam welding and ultrasonic welding. The performance was evaluated in terms of numerous factors such as production cost, degree of automation and weld quality.

Can you spot weld steel compared to copper?

Since thermal and electrical conductivity correlate for most metals, it is easier to spot weld steel in contrast to copper. Hence, resistance spot welding is only applicable when the metal sheets do not exceed a certain thickness and conductivity.

What is the purpose of the research provided on welding techniques?

The research provided on the different welding techniques is intended to support a potential new branch of the company. A template containing the topic of the project was given at the start of the project, it included relevant factors and necessary information to continue the research.