LG MJ1 Vent Cap CT Scans

<p><strong>Purpose:</strong></p>

<p>Computed tomography (CT) scans of an LG MJ1 18650 vent cap assembly were conducted to analyze the geometry and structure of  the vent cap assembly including key safety devices, such as: the current interrupt device (CID) and burst disk.  The bundled data files may be used to inspect the vent cap assembly and take measurements of geometric features.</p>

<p><strong>Method:</strong></p>

<p>The following excerpt is from the paper by Li et al. [1]:</p>

<blockquote>... CT scans were conducted using an X50 industrial X-ray inspection system from North Star Imaging (NSI).  The CT scans had spatial resolution of 16.6μm.  3D renderings of the CT scans were created with a filtered back projection algorithm using ex-X CT Software from North Star Imaging.   The 3D rendering dimensions were calibrated by scanning a reference standard with the same scan parameters and were viewed using efX-CT Lite v. 2.0.5.0 software. ... CT scans were conducted for three different states of failure: intact (normal operation), CID activated, and vent activated.</blockquote>

<p><strong>Quick Start Guide:</strong></p>

<ol>
<li>Download bundle</li>
<li>Open executable file for one of three operational states: intact, CID activated, or vent activated</li>
<li>Use "X", "Y", or "Z" keys to change viewing plane</li>
<li>Use spacebar to toggle between viewing window and scan data</li>
<li>Use mouse left-click and drag to rotate plane</li>
<li>Use mouse wheel to move viewing plane through the volume</li>
<li>Use the histogram tool to improve contrast and brightness</li>
<li>Extract 2D slices to make measurements of length, diameter, angle, etc.</li>
</ol>

<p><strong>REFERENCES:</strong></p>

<p>[1] Li, W., Crompton, K. R., Hacker, C., & Ostanek, J. K. (2020). Comparison of Current Interrupt Device and Vent Design for 18650 Format Lithium-ion Battery Caps. <em>Journal of Energy Storage</em>, 32, 101890. doi:<a href="https://doi.org/10.1016/j.est.2020.101890" target="_blank">10.1016/j.est.2020.101890</a></p>

<p><strong>DISTRIBUTION STATEMENT A.</strong> Approved for public release: distribution unlimited.</p>

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