Molicel M35A Vent Cap CT Scans

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

<p>Computed tomography (CT) scans of a Molicel M35A 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 data may be used to inspect the vent cap assembly and take measurements of geometric features.</p>

<p><strong>Contents:</strong></p>

<p>This dataset includes data for two separate CT scans: intact and vent-activated.  The intact scan includes the top portion of a fresh M35A cell, including the vent cap assembly in the pristine/intact state.  The vent-activated scan includes the vent cap assembly after the current interrupt device (CID) and vent mechanism have been activated.  The preparation of vent-activated samples is described by Li et al. [1].</p>

<p>This dataset includes four files:</p>

<ol>
<li>M35A_intact_tiff_stack.zip - compressed archive of images in .tif format from the intact CT scan.</li>
<li>M35A_intact_efX-CT.nsivol - bundled data for the intact CT scan, formatted for use with efX-CT.</li>
<li>M35A_vent_activated_tiff_stack.zip - compressed archive of images in .tif format from the vent-activated CT scan.</li>
<li>M35A_vent_activated_efX-CT.nsivol - bundled data for the vent-activated CT scan, formatted for use with efX-CT.</li>
</ol>

<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 efX-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. </blockquote>

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

<ol>
<li>Tiff stacks may be downloaded and used with image processing software, such as Dragonfly (<a href="https://theobjects.com/dragonfly/">https://theobjects.com/dragonfly/</a>).  Or bundled data is available for use with efX-CT (<a href="https://4nsi.com/product/efx-ct-software/">https://4nsi.com/product/efx-ct-software/</a>).</li>
<li>For bundled data, first download and launch the efX-CT program. </li>
<li>Then, from efX-CT, load the .nsivol file.</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" rel="nofollow noopener noreferrer noopener noreferrer" target="_blank">10.1016/j.est.2020.101890</a></p>