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Application of industrial cameras to the production of lithium batteries – Metrology and quality news

With the growing demand for lithium-ion batteries, machine vision will play an important role. One manufacturer, Allied Vision, continues to introduce new cameras, helping battery makers produce safer and more reliable batteries.

The rapid growth of the lithium battery industry

Due to the strong growth in demand for lithium battery, battery manufacturers need to maximize production efficiency while ensuring battery quality. In order to improve production efficiency, it is necessary to adapt real-time visual control throughout the manufacturing cycle.

In addition, since lithium batteries are safety related parts, there are strict requirements that must be met, which makes machine vision an inevitable part of production. According to the specifications and rules of lithium-ion battery industry published by the Ministry of Information and Technology of China (MIIT) in 2018, the measurement accuracy of coating thickness and length of The electrode should not be less than 2μm and 1mm respectively, and the burr precision after cutting should not be less than 1m.

Application of industrial cameras to the production of lithium batteries

Typically, lithium battery production involves several steps such as material preparation, electrode fabrication and notching, cell fabrication, battery module assembly, and battery packaging. Typically, lithium battery production involves several steps such as material preparation, electrode fabrication and notching, cell fabrication, battery module assembly, and battery packaging.

To minimize the cost of the system, a solution consisting of multiple cameras can be applied for high precision dimensional measurement. This solution consists of multiple lower resolution cameras to capture the dimensions of multiple sections of the object. Compared with the single camera solution, the multiple camera solution can reduce the total cost by up to 50% and will not be limited by the size of the object.

However, the multi-camera solution has high demands on the stability of the camera. This means that the camera must have low signal jitter to ensure correct data synchronization so that the high precision measurement can be obtained.

Lithium battery production process

Multi-camera solution reduces overall system cost

In this solution, the customer decided to use Allied Vision Mako cameras. Mako is very stable, and the jitter of the trigger signal is less than 8μs, which can be as low as 5μs in actual operation. The PTP function of Mako cameras can ensure proper multi-camera synchronization. The cost of four Mako G-319B cameras is half of what the high-resolution camera would cost. By adapting this solution, the customer has considerably reduced the cost of his system.

Mako combines industrial performance and a rich feature set with a small form factor at an affordable price. Its GigE Vision compatible interface allows a reliable connection to your host over long distances up to 100 meters. Power over Ethernet and Trigger over Ethernet enable simplified and cost-optimized system configurations with a single cable solution. With advanced trigger features such as Precision Time Protocol (PTP), Mako cameras can be perfectly synchronized with other devices in a multi-camera system.

For more information: www.alliedvision.com

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Mildred Lasky

The author Mildred Lasky