Energy storage welding circular welding

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.

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.

How long does the welding process last?

The entire welding process for a typical sample lasts for about 30 s and the welding speed was 1 m/s. The welding process was conducted with the welding path as described in Figure 2. As shown in the illustration, the welding path consists of a circular boundary and hatching with the parallel stripes inside the circle.

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.

Can a nanosecond-pulsed fiber laser be used to weld a battery?

To save the production cost of the battery, a nanosecond-pulsed fiber laser source is introduced to weld the battery case and tab during the packing process. In this study, the influence of the laser powers on welding these dissimilar metals was taken into account.

Is laser welding a good weld?

Laser welding, which has proven to produce a good weld with high productivity and low electrical resistance, is introduced to weld these materials. The weld was conducted with nanosecond-pulsed fiber laser and the effect of laser powers on mechanical and electrical properties as well as microstructure of the joint is investigated.