Which welding techniques can be used for connecting battery cells?

Brass (CuZn37) test samples are used for the quantitative comparison of the welding techniques, as this metal can be processed by all three welding techniques. At the end of the presented work, the suitability of resistance spot, ultrasonic and laser beam welding for connecting battery cells is evaluated.

Do welding processes need a power source?

Traditionally, welding processes in the construction sector have relied on conventional power sources, presenting a myriad of challenges. From erratic power supply to high operational costs and environmental concerns, the limitations of these traditional solutions have been evident.

Can a battery cell casing be welded?

The findings are applicable to all kinds of battery cell casings. Additionally, the three welding techniques are compared quantitatively in terms of ultimate tensile strength, heat input into a battery cell caused by the welding process, and electrical contact resistance.

What materials can be welded?

This means that highly electrically conductive materials, such as copper or aluminum, can be welded, but some difficulties arise with hard materials such as steel. The needed welding power depends on the thickness of the metal sheet vibrated by the sonotrode. The counterpart has to be fixed but may have any thickness.

What makes a good weld spot?

As discussed in Section 3, a good weld spot can only be achieved as long as the contact interface possesses a relatively high contact resistance. With every pair of weld spots made this contact resistance is reduced and therefore the quality of further weld spots might decrease.

How are three welding techniques compared?

Additionally, the three welding techniques are compared quantitatively in terms of ultimate tensile strength, heat input into a battery cell caused by the welding process, and electrical contact resistance.