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Check out this case study. This is just one example of what computed tomography can do for you.

Case Study - What WENZEL can do for you

After the measurement, and the reconstruction of the volume, it is possible to check any layer of the component from different perspectives for errors and to display the details of the component’s interior. The volume data can be visualized and analyzed with the analysis software. 

Through the reconstructed volume of the accumulator any two-dimensional cutting planes can be placed and moved with a step size in micrometer range, so a detailed analysis inside the component is possible. 

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The horizontal CT cutting plane shows the wound electrode and separator layers of the accumulator into which the so-called conductive tab is inserted (see arrow). The conductive tab is connecting the positive electrode to the cover of the cell. Looking at the conductive tab at the positive pole from a vertical perspective at the CT volume scan, the windings can be found in the lower half, in which the conductive tab is passed to.

Above is the connection of the conductive tab to the positive pole. Above the windings in the first turn of the conductive tab an interruption can be clearly observed (see arrow). This is the cause of the electrical failure. The movement of the cutting planes before and after the defective location shows that this extends continuously at the same location on all the other vertical cutting planes. This means that the conductive tab is completely broken.

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The analysis software enables the user to cut away volume parts of the accumulator using clipping boxes. The conductive tab could thus be selectively exposed by hiding areas so that the continuous crack in the CT volume scan is very easy to see.

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The direct comparison of the vertical CT-cutting planes of the electrically failed accumulator (above) with an identical electrically functional accumulator (below) shows, as expected, an intact conductive tab at the functional accumulator. Without the comparison object, the interpretation of the defect location would be compromised, as it could be interpreted that the defect is an artifact in the CT images.

Artifacts are deviations from reality in the CT image, which are artificially created so it could also be interpreted that the crack is no real gap in the conductive tab, but caused by a shadow of the more absorbent cover of the accumulator.

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