Energy storage welding nail positioning method

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 there a quality assurance approach for laser welding?

Of course, if someone looks beyond the battery welding applications many in-process quality assurance approaches are available for welding . In the case of laser welding, the in- process monitoring is mainly based on imaging, acoustic emission, and E/M signal techniques in general .

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 laser welding of pouch cell tabs be used in overlapping configuration?

Experimental setup & Quality Inspection As a case study, the laser welding of pouch cell tabs in an overlapping configuration is investigated.

How can a laser beam be positioned on a work piece?

To position the laser beam onto the work piece, the scanner optics Remote Welding Elephant by Arges was used. This optics generates a beam diameter of 50 μm in the focal plane. In this work, the process of keyhole welding was used to connect battery cells. The functional principle is shown in the illustration in Fig. 12 (a).

How do you find the optimal weld seam?

The optimal geometry of the weld seam for the used test samples is given by the edges transversely relative to the longitudinal direction of the overlap . The optimal weld seam can be realized by laser beam welding resulting in relatively low electrical contact resistances.