Application practice of lithium battery shell appearance defect detection

Infineon / Mitsubishi / Fuji / Semikron / Eupec / IXYS

Application practice of lithium battery shell appearance defect detection

Posted Date: 2024-01-20

With the popularity of electric vehicles, portable electronic devices, etc., lithium batteries have become increasingly important as an efficient energy storage solution. However, the safety of lithium batteries is directly related to the reliability of the product and user safety. Appearance defects in the casing may lead to reduced battery performance and even safety issues. Traditional manual inspection methods are inefficient on high-speed production lines, and there is a risk of missed inspections. Therefore, the introduction of AI machine vision systems has become the key to solving this problem.

Types of cosmetic defects include: Dents or Protrusions: There may be depressions or protrusions on the surface that may affect the integrity of the housing. Cracks or cracks: Cracks or cracks may develop, potentially causing the battery to leak. Foreign matter or contamination: There may be foreign matter or contamination on the surface of the casing, which may affect battery performance.

Abnormal color: The color of the shell does not meet the regulations, which may indicate a manufacturing problem.

Current missed detection rate:

Missed inspection rates may vary depending on manufacturing equipment, inspection methods, and quality inspection personnel, but the introduction of AI vision systems can usually significantly reduce the missed inspection rate.

AI detection principle:

The core of the AI ​​machine vision system is the deep learning algorithm. Through training with a large amount of sample data, the system can learn and identify the characteristics of various defects in lithium battery casings. Deep learning models analyze images through layers of neural networks to achieve highly complex pattern recognition and classification.

Detection difficulties:

Shell diversity: Lithium battery casings of different models and specifications are diverse in materials, colors, designs, etc., and the system needs to be versatile and adaptive.

minor defects: The casing may contain tiny cracks or dents that are imperceptible to the human eye but have a potential impact on battery performance.

High speed production line: Real-time and accurate inspection on high-speed production lines is a challenge, and it is necessary to ensure that the system has sufficient processing speed.

The detection rate:

Introducing AI machine vision systems often significantly improves detection rates, as the models are able to more accurately and quickly identify defects in images.

Future Trends:

Deep learning evolution: As deep learning technology continues to advance, the performance and efficiency of models will continue to improve.

End-to-end solutions: Future systems may be more integrated, providing end-to-end solutions from data collection to result output.

Real-time monitoring: Emphasis on real-time monitoring and instant analysis of large-scale data to ensure efficient operation of the production line and consistency of product quality.

The future trend of lithium battery appearance defect detection will revolve around a smarter, more comprehensive and more flexible direction to meet the changing manufacturing needs and improve product quality and production efficiency. As technology evolves, these trends will bring more opportunities and innovation to the manufacturing industry.

Review Editor: Huang Fei

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