Energy storage copper welding

Why is laser beam welding of copper a challenge?

Laser beam welding of copper materials represents a challenge due to the material-specific properties . Copper shows a high thermal conductivity (394 W/ (mK)) and low absorption rate at room temperature for wavelength ranges that include common beam sources such as CO 2 lasers or Nd:YAG lasers (Fig. 3).

Can a battery can be welded to a copper sheet?

As a stable welding connection of a 1.5 mm thick copper sheet (Cu-OF) to a 0.3 mm thick metal part (DC04, battery can) is not possible, but necessary, to reach the desired conducting cross-section of A = 50 mm 2, welding of a thin copper sheet (0.2 mm thickness, CuSn6) is used as the direct connection to the battery can.

Does copper have a high thermal conductivity and low absorption rate?

Copper shows a high thermal conductivity (394 W/ (mK)) and low absorption rate at room temperature for wavelength ranges that include common beam sources such as CO 2 lasers or Nd:YAG lasers (Fig. 3). Fibre laser sources typically have a wavelength of 1070 nm.

How to measure the reflection of laser-structured copper samples during welding?

In order to measure the reflection of the laser-structured copper samples during the welding process, bead-on-plate seams are placed in three positions in the double integrating sphere structure described in Section 3.2. The bead-on-plate seams have a length of 5 mm.

What are copper connectors used for?

Due to their electrical conductivity, copper connectors are used as electrical connecting elements between the cells, modules and peripheral electronics. This results in a large number of joints that have to withstand thermal, mechanical and electrical loads.

What happens if a copper surface is untreated?

The welding process on the untreated copper surface is not stable, and the course of the reflected power P R decreases over time. In the range between the two surface qualities, the coupling degree η increases. At the edge of the structured area, the surface is undefined and not as regular as in the middle of the structured area.