SOLUTION BRIEF

Introduction

Battery system manufacturersrequire cost-effective, fast, and reliable 바카라 보너스 기준 methods for thin aluminum and copper foil applications. Non-contact laser 바카라 보너스 기준 offers an attractive option, but has not been usable in the past with foil thicknesses below 200 µm. This was because existing fiber laser sources could not deliver their power with the necessary spatial distribution. Specifically, a high-power fiber laser produced damage on the top foil sheet, while low-power fiber lasers didn’t achieve adequate weld penetration. TheAdjustable Ring Mode (바카라 보너스 기준M) fiber laserwith a single-mode center beam over바카라 보너스 기준mes these limitations.

Process

A common task in battery module production is connecting multiple batteries together in electrical series by overlap 바카라 보너스 기준 a thin aluminum busbar to thicker copper bar. Tests were performed on 바카라 보너스 기준 a 0.2 mm thick aluminum sheet (on top) to a 1.5 mm thick copper bar (on bottom). The HighLight FL4000CSM-ARM source was used, with a 25 µm/170 µm (center beam/ring beam) process fiber, and remote 바카라 보너스 기준 scanner optics that produced a 3x magnification of the beam at the work surface. Center beam power was 500-800 W, and ring power was 1000-1200 W. Laser power was applied for 0.18-0.32 seconds. The power in the center and ring beams was independently controlled.

Results

A high-quality, full-penetration weld was achieved, without damage to the thin 바카라 보너스 기준 foil (see figure 2). The process produced no spatter and did not require the use of filler wire. The reason for these positive results is that the바카라 보너스 기준M laserstabilizes the keyhole 바카라 보너스 기준 depth with the ring beam. The single-mode center beam, with its high brightness (high energy density but low total energy), performs the actual 바카라 보너스 기준 without damaging the material by introducing in too much heat. Finally, the independently controlled ramp down of the ring power allows the material to cool in a controlled manner, thus minimizing weld pool turbulence and eliminating spatter.

Application Field

Laser 바카라 보너스 기준 of thin foils and heat-sensitive materials forbatteryande-mobility applications.This includes copper foil stack and foil-to-tab 바카라 보너스 기준 in the battery industry, and aluminum sheet-to-copper bar 바카라 보너스 기준.