Real-Time Laser Weld Measurement Enhances Quality Control in EV Battery Manufacturing

White Paper: Manufacturing & Prototyping

SPONSORED BY:

Real-time laser weld measurement, powered by a patented implementation of Inline Coherent Imaging (ICI), delivers micrometer-scale weld measurements during fiber laser welding, enabling robust and immediate defect detection, lower scrap rates, and traceable quality control across high-volume battery production lines. This white paper highlights the advantages of this unique weld monitoring technique and how it is used to improve weld quality control in demanding applications.

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Overview

This white paper from IPG Photonics presents Inline Coherent Imaging (ICI)-based real-time laser weld measurement as a transformative solution for high-precision weld verification in electric vehicle (EV) manufacturing, especially for battery production. Welding defects in EV batteries—caused by factors such as inconsistent materials, tight process windows, and optical contamination—can significantly impact electrical, mechanical, and thermal performance, leading to costly recalls, warranty claims, and production delays. Traditional weld monitoring methods, including destructive testing and indirect sensing technologies, are either slow, subjective, or unable to provide comprehensive geometric data in real time.

Using patented ICI technology, IPG’s Laser Depth Diagnostics (LDD) systems integrate a low-power measurement laser alongside the primary welding beam to directly measure critical weld geometries at the micron scale during welding. Key metrics captured include keyhole depth (weld penetration), finished weld surface profile, transverse weld bead profile, and seam alignment. This direct measurement approach enables immediate detection and correction of defects such as over- or under-penetration, pinholes, and misalignment before welds are completed or assembled into modules.

Advantages of LDD real-time measurement include elimination of destructive testing, maintenance of high production speeds (up to 250 kHz), high accuracy matching or exceeding traditional methods, and compatibility with complex weld paths and high aspect-ratio geometries common in EV battery manufacturing. Data from every weld can be integrated with production management systems, enabling rigorous traceability, trend analysis, and predictive maintenance to minimize scrap and optimize quality control.

In summary, IPG Photonics’ LDD-based real-time laser weld measurement offers EV manufacturers an advanced, reliable, and scalable weld inspection solution that improves quality assurance, reduces waste, and supports the stringent demands of high-volume EV battery production, addressing an escalating industry need as EV adoption grows.