Battery Cell Electrode Alignment Imaging Under Vibration Noise
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Solution Overview
Problem
Conventional methods for inspecting electrode alignment in battery cells are prone to errors due to illumination intensity, process dispersion, and equipment vibration, leading to inaccurate measurements and potential defects in electrode alignment.
Innovation Solution
A method and device that synthesize stacked images of the negative and positive electrode plates and the separator, while removing vibration noise, to accurately calculate the gap between these components, ensuring precise alignment inspection by using cameras and grippers to capture and correct images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vision camera is used to photograph the gap between electrode plates and separator, then electrode alignment can be inspected, but measurement accuracy deteriorates due to illumination intensity variations and process dispersion
Solution Approach 1:
The patent applies preliminary action by stabilizing the electrode plates and separator on the stack table before photographing. The stack table is designed to hold these components firmly in place, preventing movement during the imaging process. This preliminary stabilization ensures that the components remain stationary during photographing, thereby improving measurement precision while maintaining inspection reliability
Solution Approach 2:
The patent changes the parameter of component stability by introducing a stack table with specific structural features (table body, table legs, and support surfaces) that provide enhanced mechanical stability. This parameter change from unstable to stable positioning directly improves gap measurement precision by eliminating movement-induced errors during photographing
2Productivity
If equipment vibration occurs during electrode alignment inspection, then inspection can be performed, but measurement accuracy deteriorates due to noise from vibration
Solution Approach 1:
The patent applies beforehand cushioning by designing the stack table with vibration-dampening structural features. The table body and table legs are configured to absorb and dampen vibrations before they can affect the electrode plates and separator during inspection. This prior cushioning of vibrations maintains both inspection capability and measurement precision by preventing vibration noise from degrading the quality of photographs
3Loss of information
If the gap between electrode plates and separator is measured photographically, then alignment state can be determined, but measurement accuracy deteriorates due to edge sharpness reduction
Solution Approach 1:
The patent applies preliminary action by ensuring optimal positioning and stabilization of the electrode plates and separator on the stack table before photographing. The support surfaces of the table body and table legs hold the components in fixed, well-defined positions with sharp edges visible in photographs. This preliminary proper positioning prevents edge blur and maintains edge sharpness, thereby preserving edge detail information and improving gap measurement precision
Data Source
AI summary
Disclosed is a method for inspecting electrode alignment of a battery cell that inspects an alignment state of a jelly roll including a negative electrode plate, a positive electrode plate, and a separator of the battery cell. The method includes: supplying the separator to fix both portions of the separator to a stack table using a first gripper and a second gripper; rotating the stack table to face one side; stacking the negative electrode plate on the separator; fixing the negative electrode plate on the separator; obtaining a first image by photographing the negative electrode plate and by calculating a position of the negative electrode plate; rotating the stack table to face the other side and supplying the separator on the negative electrode plate after the second gripper is released; stacking the positive electrode plate on the separator; and fixing the positive electrode plate on the separator.