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.

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).

What is laser micro welding?

Laser micro welding with fibre lasers (1070 nm) meets the requirements placed on joining technology. Due to the high beam quality, very small spot diameters and thus very high intensities can be achieved. Copper materials of high purity are used to achieve the high conductivity of the electrical connection.

What is the coupling degree of untreated copper?

At the crossover to the area of untreated copper, the coupling degree drops from 69 to 63%. However, the deep penetration welding process is sustained after the change. On the untreated copper, the process is significantly smoother compared to position A.

How thick can a weld be in copper?

Butt, fillet and lap welds in copper are routinely achieved up to and a little beyond a thickness of 0.02 in, says the company, which stresses the importance of using the welding system’s pulsation function to avoid porosity in the weld.

Can laser welding be used in EV battery production?

Of these, laser and ultrasonic welding processes dominate in EV battery manufacture – with laser welding the preferred solution for mass production – and continue to be improved and refined. “We see a lot of laser welding and ultrasonic wedge bonding for the larger packs,” says Boyle at Amada Weld Tech.