Cylindrical Battery Collector Plate Layout for Clearer X-Ray Weld Inspection
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Solution Overview
Problem
X-ray images of welded parts in cylindrical batteries exhibit distortion due to varying angles of incidence, which affects the accuracy of welding inspection.
Innovation Solution
The cylindrical battery design includes a winding electrode group with current collector plates joined to electrode plates at positions shifted in the winding direction, ensuring consistent angles of incidence for X-ray inspection, reducing distortion in X-ray images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple welded parts are arranged linearly in the radial direction, then the welding inspection can be performed efficiently, but the X-ray images exhibit distortion due to varying angles of incidence
Solution Approach 1:
The welded parts are arranged asymmetrically with respect to the X-ray source position. Specifically, the welded parts are positioned at different angular positions around the cylindrical battery, creating an asymmetric configuration that ensures consistent X-ray incidence angles. This asymmetric arrangement eliminates the distortion problem while maintaining inspection efficiency.
Solution Approach 2:
The arrangement of welded parts transitions from a simple linear radial arrangement to a three-dimensional configuration that incorporates angular positioning. By adding the angular dimension to the arrangement, the patent ensures that all welded parts are positioned at optimal angles relative to the X-ray source, eliminating distortion while maintaining radial arrangement benefits.
2Volume of moving object
If welded parts are arranged in a radial direction for compact design, then space utilization is improved, but the varying angles of incidence cause image distortion
Solution Approach 1:
The patent employs asymmetric positioning of welded parts within the radial arrangement. Instead of uniform radial spacing, the welded parts are positioned at specific asymmetric angles that optimize X-ray incidence. This maintains the compact radial design while ensuring consistent imaging angles for accurate welding inspection.
Solution Approach 2:
Different regions of the radial arrangement are assigned different angular positions based on their specific inspection requirements. Each welded part is positioned at a locally optimized angle relative to the X-ray source, ensuring that the varying radial positions do not result in varying incidence angles. This local optimization maintains compactness while achieving uniform imaging quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the accuracy of welding inspection by minimizing distortion in X-ray images and reducing the risk of welded part failure during charging and discharging cycles.
Implementation Method 1
the welded part is irradiated with an X-ray passing a corner of the upper end of the lid and inclined outward with respect to the side edge of the lid
Data Source
AI summary
In a winding electrode group a separator and an electrode plate are stacked and wound. A first current collector plate includes a ring member and a partial ring member. The partial ring member is joined, in a first welded part (embodiment), to each of a plurality of first electrode core members arranged in a radial direction of the electrode group. Of a plurality of first welded parts (embodiment), two first welded parts (embodiment) adjacent in the radial direction are disposed at positions shifted in a winding direction intersecting the radial direction.