8cd4e1437c
Un distributeur qui transmet au constructeur ne doit dependre d'aucun lien exterieur, et le destinataire final lit peut-etre le chinois plutot que le francais. Les trois versions HTML rejoignent donc l'envoi, et le courrier decrit sa piece jointe au lieu de proposer de la fournir. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KKzkkVTG6KXnGXFFC7X9XJ
182 lines
26 KiB
HTML
182 lines
26 KiB
HTML
<title>The Hundred and Five Cells</title>
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<div class="page">
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<header>
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<div class="etiq">Pylontech pack · diagnosis in progress</div>
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<h1>The Hundred and Five Cells</h1>
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<p class="chapeau">Eight modules, fifteen cells each. Ten of those cells throttle the charging of the other ninety-five. Here is which ones, how we know, and what can be done about it.</p>
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<div class="maj">Last updated : 5 September 2026, 17:00</div>
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</header>
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<div class="verdict"><div><div class="n">10</div><div class="l">affected cells out of 105</div></div><div><div class="n">3</div><div class="l">modules involved out of 8</div></div><div><div class="n">5 s</div><div class="l">from threshold crossing to current cut</div></div><div><div class="n">30 A</div><div class="l">limit imposed on the whole pack, against 150 A nominal</div></div></div>
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<div class="mesure"><h2><span class="num">1</span>The verdict</h2><p>The pack is not worn out. Four modules out of eight are <strong>flawless</strong>:
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sixty cells without a single anomaly, after more than three hundred cycles. A
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fifth is just as clean.</p>
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<p>Three modules carry the entire problem, and within those three, <strong>ten
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cells</strong>. When one of them reaches 3550 mV the BMS reduces the charge
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current — not for its own module, but <strong>for the whole pack</strong>. Five
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healthy modules are throttled by ten cells.</p></div>
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fill="var(--sain)"/><text x="218.95999999999998" y="982" class="fv">136</text><text x="88" y="996" class="fc">12</text><rect x="96" y="988" width="117.8" height="10" rx="2" fill="var(--sain)"/><text x="219.82" y="997" class="fv">137</text><text x="88" y="1011" class="fc">13</text><rect x="96" y="1003" width="110.1" height="10" rx="2" fill="var(--sain)"/><text x="212.07999999999998" y="1012" class="fv">128</text><text x="88" y="1026" class="fc">14</text><rect x="96" y="1018" width="116.1" height="10" rx="2" fill="var(--sain)"/><text x="218.1" y="1027" class="fv">135</text><text x="88" y="1041" class="fc">15</text><rect x="96" y="1033" width="587.4" height="10" rx="2" fill="var(--mort)"/><text x="689.38" y="1042" class="fv">683</text></svg></div>
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<div class="legende"><span><i class="pastille" style="background:var(--sain)"></i>healthy</span><span><i class="pastille" style="background:var(--attention)"></i>drifting</span><span><i class="pastille" style="background:var(--grave)"></i>badly affected</span><span><i class="pastille" style="background:var(--mort)"></i>terminal</span></div>
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<figcaption>Voltage span swept by each cell between its minimum and maximum over the
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observation period. The first module is the <strong>control</strong>: it lives on
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the same chain as the two damaged ones, has seen the same currents and the same
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days, and its fifteen cells sit within <strong>eleven millivolts of span of each
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other</strong>. A cell that has lost capacity fills and empties before its
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neighbours, so it sweeps a far wider range at identical current — the sign
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requires no disassembly. The isolated module shows smaller spans because it spent
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the period out of service, over a narrower state-of-charge window: what matters
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is the gap to its own neighbours, not the absolute value.</figcaption>
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</figure>
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<div class="mesure"><h2><span class="num">2</span>The pack, module by module</h2><p>A module's identity is its barcode, never its address: each chain renumbers
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its modules from 1, so there are two “module 1” in this installation.</p></div>
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<div class="tabl"><table><thead><tr><th>Barcode</th><th>Pack</th><th>Addr.</th><th>Affected cells</th><th>Which ones</th><th>Median spread</th><th>Overvoltage</th><th>Undervoltage</th><th></th></tr></thead><tbody><tr class="mal"><td class="mono">K220803C30160322</td><td>older</td><td class="num">1</td><td class="num gros">4</td><td class="cel">6 · 7 · 12 · 14</td><td class="num">108</td><td class="num">498</td><td class="num">86</td><td class="etat">in service</td></tr><tr class=""><td class="mono">K220803C30160323</td><td>older</td><td class="num">2</td><td class="num gros">0</td><td class="cel">—</td><td class="num">6</td><td class="num">0</td><td class="num">0</td><td class="etat">in service</td></tr><tr class="mal"><td class="mono">K220803C30160319</td><td>older</td><td class="num">3</td><td class="num gros">5</td><td class="cel">2 · 6 · 10 · 12 · 15</td><td class="num">45</td><td class="num">416</td><td class="num">179</td><td class="etat">in service</td></tr><tr class="mal"><td class="mono">K220803C30160324</td><td>older</td><td class="num">4</td><td class="num gros">1</td><td class="cel">15</td><td class="num">57</td><td class="num">29</td><td class="num">59</td><td class="etat">isolated</td></tr><tr class=""><td class="mono">Y230202C30371426</td><td>newer</td><td class="num">1</td><td class="num gros">0</td><td class="cel">—</td><td class="num">2</td><td class="num">1</td><td class="num">1</td><td class="etat">in service</td></tr><tr class=""><td class="mono">Y230202C30371425</td><td>newer</td><td class="num">2</td><td class="num gros">0</td><td class="cel">—</td><td class="num">2</td><td class="num">1</td><td class="num">1</td><td class="etat">in service</td></tr><tr class=""><td class="mono">Y230202C30371431</td><td>newer</td><td class="num">3</td><td class="num gros">0</td><td class="cel">—</td><td class="num">2</td><td class="num">1</td><td class="num">1</td><td class="etat">in service</td></tr><tr class=""><td class="mono">Y230202C30371427</td><td>newer</td><td class="num">4</td><td class="num gros">0</td><td class="cel">—</td><td class="num">2</td><td class="num">1</td><td class="num">0</td><td class="etat">in service</td></tr></tbody></table></div>
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<div class="mesure"><p>Read the median spread column. The five healthy modules sit between
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<strong>2 and 6 millivolts</strong>; the other three are at 45, 57 and 108. The
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same contrast shows in the overvoltage counters: <strong>498</strong> for the
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first module against <strong>one</strong> for each of the four in the newer pack,
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which have nonetheless taken ten times more cycles.</p>
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<p>All sixty cells of the newer pack sweep between 168 and 191 mV, without
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exception. The inventory is closed.</p>
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<h2><span class="num">3</span>The trip, timed</h2><p>On 5 September the console was connected to the three modules of the older
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pack while the alarm was rising. What follows is the record, to the second.</p></div>
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<div class="tabl"><table><thead><tr><th>Time</th><th>What happens</th><th></th></tr></thead><tbody><tr><td class="mono h">13:04:48</td><td>cell 7 of module …0322 at <b>3526 mV</b>, cell 6 of module …0319 at <b>3541</b></td><td class="note">below threshold</td></tr><tr><td class="mono h">13:05:08</td><td>the same two at <b>3555</b> and <b>3575 mV</b></td><td class="note">level 3 crossed</td></tr><tr><td class="mono h">13:05:13</td><td>the BMS drops the allowed charge current from <b>50 to 30 A</b></td><td class="note">five seconds later</td></tr><tr><td class="mono h">13:15:10</td><td>cells fall back to 3499 and 3522 mV, alarm clears</td><td class="note">the limit stays at 30 A</td></tr><tr><td class="mono h">13:22:40</td><td>limit <b>30 → 40 A</b></td><td class="note">after 7 min 31 s</td></tr><tr><td class="mono h">13:26:39</td><td>limit <b>40 → 35 A</b>, leading cells at 3563 and 3548 mV</td><td class="note">it trips again</td></tr><tr><td class="mono h">13:38:10</td><td>limit <b>35 → 40 A</b></td><td class="note">after 11 min 31 s</td></tr></tbody></table></div>
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<div class="mesure">
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<div class="encart"><p><strong>The most useful finding</strong> is in the fourth row: the alarm
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clears well before the limit recovers. Looking for the alarm in the logs therefore
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misses the bulk of the phenomenon — the alarm lasts minutes, the throttling lasts
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hours.</p></div>
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<p>The thresholds are not values we chose: they are the ones the hardware
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declares, read from <span class="mono">sysinfo</span> on the LV-HUB.</p><ul><li><span class="mono">3480 mV</span> level 1</li><li><span class="mono">3520 mV</span> level 2</li><li><span class="mono">3550 mV</span> level 3 — current is reduced</li><li><span class="mono">3600 mV</span> level 4</li></ul>
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<h2><span class="num">4</span>Internal resistance, or charge imbalance?</h2><p>The answer decides what balancing can give back. Two measurement points on
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|
the same cell at two different currents settle it.</p>
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<table class="mini"><tr><th></th><th>current per cell</th><th>spread</th></tr>
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<tr><td class="mono">13:04:48</td><td class="num">6.33 A</td><td class="num">163 mV</td></tr>
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<tr><td class="mono">14:05:42</td><td class="num">0.04 A</td><td class="num">46 mV</td></tr></table>
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<p>The slope gives <strong>≈ 18.6 mΩ</strong> of excess internal resistance on the
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leading cell, twenty to forty times that of a healthy one. The intercept,
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|
<strong>≈ 46 mV</strong>, is the true charge imbalance.</p>
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<p>Independent check: this line predicts 312 mV at 100 A pack current. The largest
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|
spread actually recorded over thirty-seven days is 280 mV.</p>
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|
<p>So of the ~190 mV of spread under charge, <strong>only 46 mV are an
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|
imbalance</strong> — the rest is lost capacity. A perfect rebalance would bring the
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|
trip from 3555 down to about 3510 mV: below the threshold, but with only forty
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millivolts of margin.</p>
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<h2><span class="num">5</span>Where the damage comes from</h2><p>Not from wear. The newer pack has taken three hundred and forty cycles in a
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|
year and its sixty cells are intact: cycling does not damage these modules. And
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the control module shared the chain, the currents and the days of the two damaged
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ones without a scratch.</p>
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<p>The two terminal cells went down to <span class="mono">2953</span> and
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<span class="mono">2939 mV</span>, below the low-voltage alarm threshold. A
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lithium iron phosphate cell taken there under load loses capacity irreversibly.
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<strong>These cells did not age, they were discharged too deep.</strong></p>
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<h2><span class="num">6</span>Three questions for Pylontech</h2>
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<ol><li>Are these cells recoverable by a prolonged hold at high state of charge, or does the 18.6 mΩ resistive component make the attempt pointless?</li><li>Is there a recommended procedure for a module in this condition, and a limit beyond which module replacement is the only option?</li><li>What exactly does the per-cell <span class="mono">SOHCount</span> returned by the <span class="mono">soh</span> command count, and from what value does Pylontech consider a cell to require attention?</li></ol>
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</div>
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<footer>Measurements taken on the serial console of the Pylontech BMS units, which neither Home Assistant nor the Victron GX exposes: the system publishes only the pack aggregate. Self-consumption installation without grid feed-in, two MultiPlus-II 48/5000 in parallel. This report evolves as the work proceeds.</footer>
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</div>
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