Visual Inspection for Laser Welding Joints of Electrodes in Lithium-ion Battery Packing

Chen, Zhong; Hao, Yuya; Liu, Zichen; Zhang, Xianmin

doi:10.1109/i2mtc43012.2020.9129209

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…However, this welding technique is only can be used on the designed joint (lap joint) as well as the technique requires custom tooling for every new project. Recently, an advanced technology, laser material processing, has been developing and applying in diverse industries, especially in lithium-ion battery manufacturing [21][22][23][24][25][26][27][28][29]. Moreover, the laser welding is well known for the non-contact process which provides various benefits for the weld such as low heat input, small heat-affected zone, fast processing, and low thermal deformation.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Using a Metal Tube on Laser Welding of the Battery Case and the Tab for Lithium-Ion Battery

Trinh

Lee

2020

Materials

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Given the drawbacks of the conventional welding methods in joining the battery case and tab in the lithium-ion battery, the laser welding technique using the metal tube has been introduced for the weld. The metal tube is supposed to contribute a positive effect including protection to the outside structure by blocking the injection of the spatters, and minimization of the contact gap between the battery case and table. However, the use of the metal tube is believed to cause the plume trapped inside and affect the intensity distribution of the laser gaussian beam. Through the observation and analysis in this study, both advantages and disadvantages of the application of the metal tube on the weld have been analyzed. The use of the metal tube prevents the ejection of the spatter to the outside of the welding zone, as well as minimize the air gap between the battery case and tab in the lap joint weld is also minimized. On the other hand, the trapped plume inside the metal tube and the reduction of the energy of the laser beam have been considered to cause significant changes in the morphology, mechanical, and electrical properties of the weld.

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Section: Introductionmentioning

confidence: 99%

The Effect of Using a Metal Tube on Laser Welding of the Battery Case and the Tab for Lithium-Ion Battery

Trinh

Lee

2020

Materials

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Applying edge artificial intelligence to closed-loop real time control and monitoring of laser based battery pack welding

Arejita

Isaza²,

Roldán-Paraponiaris³

et al. 2022

Journal of Laser Applications

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The manufacturing of battery packs plays an essential role in e-mobility. In this context, laser welding of batteries has taken a considerable momentum in recent years as it can quickly adapt to different form factors and battery arrangements which is crucial for short runs and on-demand manufacturing. In this paper, we present an assisted battery pack welding system applying a novel sensor fusion strategy. The presented work introduces a multi-camera solution combining a camera in the visual range and an infrared camera in a compact scanner head that applies graphics processing unit acceleration for image processing and real-time field programmable gate array processing for process control. In order to acquire accurate temperature measurements, the infrared camera has been characterized and calibrated for the temperature ranges of the welding process. In addition, we propose a method for image space coordinate transformation based on affine transformations used to transform the coordinates of the detected battery joints into different image spaces to adapt to the welding process in real time. A single shot multibox detector Mobilenet-v2 neural network has been retrained with custom images to detect and classify a set of battery pack types allowing the extraction of the battery cell joint coordinates using image processing, which enables the application of real-time corrections to the laser aiming system and a closed-loop laser power control. Finally, we present some battery welding results using different welding strategies on the described system.

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Visual Inspection for Laser Welding Joints of Electrodes in Lithium-ion Battery Packing

Cited by 2 publications

References 6 publications

The Effect of Using a Metal Tube on Laser Welding of the Battery Case and the Tab for Lithium-Ion Battery

The Effect of Using a Metal Tube on Laser Welding of the Battery Case and the Tab for Lithium-Ion Battery

Applying edge artificial intelligence to closed-loop real time control and monitoring of laser based battery pack welding

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