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RommudohHere are a few more boards, one for 4S and two for 3S. The last one is attached to a triple 18650 battery holder and will be tested with real cells soon. So far all tests look fine. The 4S and 3S LiIon were soldered using hot air and solder paste (except the MOSFETs, those were already soldered using a normal iron). This was a very pleasant experience and I will use it more often. <a href="https://social.tchncs.de/tags/soldering" class="mention hashtag" rel="nofollow noopener" target="_blank">#soldering</a> <a href="https://social.tchncs.de/tags/diyelectronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#diyelectronics</a> <a href="https://social.tchncs.de/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> <a href="https://social.tchncs.de/tags/lithiumbattery" class="mention hashtag" rel="nofollow noopener" target="_blank">#lithiumbattery</a> #18650 <a href="https://social.tchncs.de/tags/BQ77915" class="mention hashtag" rel="nofollow noopener" target="_blank">#BQ77915</a> <a href="https://social.tchncs.de/tags/hotairsoldering" class="mention hashtag" rel="nofollow noopener" target="_blank">#hotairsoldering</a> <a href="https://social.tchncs.de/tags/solderpaste" class="mention hashtag" rel="nofollow noopener" target="_blank">#solderpaste</a>

RommudohAnd I finished <a href="https://social.tchncs.de/tags/soldering" class="mention hashtag" rel="nofollow noopener" target="_blank">#soldering</a> the first <a href="https://social.tchncs.de/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> board. It's configured for a 5S LiIon <a href="https://social.tchncs.de/tags/battery" class="mention hashtag" rel="nofollow noopener" target="_blank">#battery</a> with 5A output current limit. Here the finished board and the test setup. So far, it works as intended. It cuts discharge at 4.91A, or when battery voltage drops below 14.5V. Charging is disabled when voltage gets too high. I'll still have to test the temperature behavior, and how balancing works. When I'm satisfied, I'll try with real cells. <a href="https://social.tchncs.de/tags/diyelectronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#diyelectronics</a> <a href="https://social.tchncs.de/tags/BQ77915" class="mention hashtag" rel="nofollow noopener" target="_blank">#BQ77915</a>

RommudohMy <a href="https://social.tchncs.de/tags/BMS" class="mention hashtag" rel="nofollow noopener" target="_blank">#BMS</a> <a href="https://social.tchncs.de/tags/PCBs" class="mention hashtag" rel="nofollow noopener" target="_blank">#PCBs</a> arrived from <a href="https://aisler.social/@aislerhq" class="u-url mention" rel="nofollow noopener" target="_blank">@aislerhq</a> and they look nice. I designed it because I couldn't find 3S BMS for <a href="https://social.tchncs.de/tags/LiFePO4" class="mention hashtag" rel="nofollow noopener" target="_blank">#LiFePO4</a> cells and didn't like the voltage thresholds of the cheap <a href="https://social.tchncs.de/tags/LiIon" class="mention hashtag" rel="nofollow noopener" target="_blank">#LiIon</a> ones. It uses the <a href="https://social.tchncs.de/tags/BQ77915" class="mention hashtag" rel="nofollow noopener" target="_blank">#BQ77915</a> chip from <a href="https://social.tchncs.de/tags/TexasInstruments" class="mention hashtag" rel="nofollow noopener" target="_blank">#TexasInstruments</a>. Size is 63x50mm. While fetching all components according to the BOM, I noticed the <a href="https://social.tchncs.de/tags/diode" class="mention hashtag" rel="nofollow noopener" target="_blank">#diode</a> had the <a href="https://social.tchncs.de/tags/footprint" class="mention hashtag" rel="nofollow noopener" target="_blank">#footprint</a> SOT-323 assigned. I only have SOT-23 ones :blobcatgoogly: I'm glad that I can still make it fit, and the third leg isn't used at all (it's a single diode). Can't wait to find some time to finish soldering a few and try them out. It supports 3S up to 5S, and I added <a href="https://social.tchncs.de/tags/silkscreen" class="mention hashtag" rel="nofollow noopener" target="_blank">#silkscreen</a> part to mark how it's configured. The back has detailed instructions, so I don't forget them.

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