No energy storage welding nails

Do voids inside the weld Nuggets reduce the strength of a joint?

The voids inside the weld nuggets for spot-welded CuZn37 test samples reduce the strength of the joint. But for spot-welded Hilumin test samples the base material failed and not the weld spots themselves (see Fig. 6). This was only observed with resistance spot welding.

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.

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.

Is nail penetration a reliable test for lithium-ion battery safety?

Lithium-ion battery safety evaluation covers a broad spectrum of abuse conditions. One of the popular testing methodologies is nail penetration. However, the reproducibility of nail penetration tests is rather poor, which compromises the credibility of the results.

How does welding energy affect electrical contact resistance and tensile force?

Further increasing the welding energy leads to electrode sticking and significant expulsion of bulk material , , , . Fig. 6. Electrical contact resistance and ultimate tensile force as function of welding energy.

Can keyhole welding be used on battery tabs & connector bars?

Furthermore, battery tabs or connector bars with a thickness of several millimeters can be joined by keyhole welding , . Especially for metal surfaces, the reflection of the laser beam is problematic, because it can damage objects in close vicinity.