Lithium battery open circuit voltage (ocv) detection overview:
OCV open circuit voltage open circuit voltage, OCV test is mainly measured by the probe connected to the voltage tester and internal resistance tester on the positive and negative ears of the soft pack battery, the OCV test is in the battery test A more important part. After the battery is grabbed in the loading area, it passes through the visual correction station and is placed at a fixed test point. The machine test station presses the probe on the ear, and obtains the accurate data of the battery in a short time, and then the picking machine will Defective products and good products are separated during the test and processed in the next step.
The role of the visual workstation:
This project uses Visual Dragon's VD200 robot vision guidance control system. There are 2 visual workstations in the project, the station 1 is foolproof (to determine whether the battery is available), and the station 2 is a correction product. Visual Work Station 1 mainly provides information on whether or not the battery is sent to the robot in the jig. The robot moves to the position where the battery is moved according to the information movement, which saves time and avoids the safety caused by the battery falling off caused by mistakenly grasping the tray. Visual Work Station 2 is mainly to adjust the offset of the correcting product, so that the product is placed at a fixed point to be tested, so that the contact position of the probe and the tab are consistent every time to ensure the accuracy of the test.
Difficulties and solutions for visual workstations:
The difficulty is that the tray and the battery have different specifications, different colors and different quantities. When the battery is judged or corrected, the traditional production template cannot be compatible with various types of batteries, and it is difficult to achieve stability.
By adjusting the lighting method and improving the visual algorithm, the visual dragon engineer avoids the traditional method of making templates, and achieves accurate positioning without templates. When the battery is foolproof and rectified, it achieves the one-key change function, ensuring the ease of use and stability of the OCV test equipment, and avoiding repeated template creation.
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