<div dir="ltr"><div dir="ltr"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">The cells are simple, the BMS is the complicated part.</div><div dir="ltr">For a pressure-tolerant battery, you would either need to house off-the-shelf BMS electronics in the pressure hull, or in a separate pressure-housings. </div><div dir="ltr"><br></div><div dir="ltr">There are commercially available, pressure-tolerant lithium-polymer batteries, and they all use pouch-style cells. Alan, you've correctly deduced that the cylindrical cells don't hold up.</div><div dir="ltr"><br></div><div dir="ltr">Lithium Iron Phosphate cells are safe enough, that I would consider putting them inside of the pressure hull. They don't use a flammable or pyrophoric electrolyte like Lithium Polymer, so won't burst into flames if punctured, or overloaded. They also don't off gas hydrogen like lead acid (And yes, even AGM's can and do offgas hydrogen) or have acid that can spill or boil over.</div><div dir="ltr"><br></div><div dir="ltr">A 12V or 24V LiFePO4 battery string would be the ideal candidate for installation in a K250. Probably on the whole safer than lead-acid, lighter, and would be able to be charged much quicker, practically a lunch-break.<br><div><br></div><div dir="ltr">-River J. Dolfi<div><div><a href="mailto:rdolfi7@gmail.com" target="_blank">rdolfi7@gmail.com</a></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Dec 3, 2019 at 2:42 PM via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send Personal_Submersibles mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. PanelPilotACE (Pete Niedermayr via Personal_Submersibles)<br>
2. Re: PanelPilotACE (Alan via Personal_Submersibles)<br>
3. Pressure resistant lie batteries<br>
(Beram Mahmoud via Personal_Submersibles)<br>
4. Triton sub cabin fire (March 2019)<br>
(irox via Personal_Submersibles)<br>
5. Re: Pressure resistant lie batteries<br>
(Alan via Personal_Submersibles)<br>
6. Re: Pressure resistant lie batteries<br>
(Alan via Personal_Submersibles)<br>
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Message: 1<br>
Date: Tue, 19 Nov 2019 00:07:17 +0000 (UTC)<br>
From: Pete Niedermayr via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
To: "<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>"<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
Subject: [PSUBS-MAILIST] PanelPilotACE<br>
Message-ID: <<a href="mailto:1384623172.2927077.1574122037541@mail.yahoo.com" target="_blank">1384623172.2927077.1574122037541@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Just saw this on SV Seeker<br>
PanelPilotACE PanelPilot Displays - Lascar Electronics<br>
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PanelPilotACE PanelPilot Displays - Lascar Electronics<br>
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Message: 2<br>
Date: Tue, 19 Nov 2019 13:32:30 +1300<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] PanelPilotACE<br>
Message-ID: <<a href="mailto:3E8BF536-891A-4110-8A76-79170BE781A6@yahoo.com" target="_blank">3E8BF536-891A-4110-8A76-79170BE781A6@yahoo.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
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Looks a great product Pete, & cheap.<br>
No writing of code!<br>
This video gives a good explanation of it.<br>
<a href="https://m.youtube.com/watch?v=EV_m3dcdRc8&t=" rel="noreferrer" target="_blank">https://m.youtube.com/watch?v=EV_m3dcdRc8&t=</a><br>
Alan<br>
<br>
> On 19/11/2019, at 1:07 PM, Pete Niedermayr via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br>
> <br>
> Just saw this on SV Seeker<br>
> <br>
> PanelPilotACE PanelPilot Displays - Lascar Electronics<br>
> <br>
> PanelPilotACE PanelPilot Displays - Lascar Electronics<br>
> <br>
> <br>
> _______________________________________________<br>
> Personal_Submersibles mailing list<br>
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Message: 3<br>
Date: Tue, 3 Dec 2019 19:02:02 +0100<br>
From: Beram Mahmoud via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
Subject: [PSUBS-MAILIST] Pressure resistant lie batteries<br>
Message-ID: <<a href="mailto:98C084E6-EBDC-4057-A4ED-719158070DBD@gmx.de" target="_blank">98C084E6-EBDC-4057-A4ED-719158070DBD@gmx.de</a>><br>
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<br>
Hello,<br>
Does anyone know of an instruction how to make pressure resistant li batterie systems?<br>
<br>
Is it sufficient to fill up the battery with the bms in an oil filled canister?<br>
<br>
Best regards <br>
Beram<br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 4<br>
Date: Tue, 3 Dec 2019 11:03:54 -0800 (GMT-08:00)<br>
From: irox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
To: <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a><br>
Subject: [PSUBS-MAILIST] Triton sub cabin fire (March 2019)<br>
Message-ID:<br>
<<a href="mailto:2116245540.6634.1575399835653@wamui-agami.atl.sa.earthlink.net" target="_blank">2116245540.6634.1575399835653@wamui-agami.atl.sa.earthlink.net</a>><br>
Content-Type: text/plain; charset=UTF-8<br>
<br>
<br>
I came cross this article about a cabin fire in what I believe is a Triton sub:<br>
<a href="https://www.businessinsider.com/british-research-sub-surfaces-after-fire-300-feet-below-india-ocean-2019-3" rel="noreferrer" target="_blank">https://www.businessinsider.com/british-research-sub-surfaces-after-fire-300-feet-below-india-ocean-2019-3</a><br>
<br>
Does anybody have more details on this incident?<br>
<br>
The article is a bit light on details, although the fact it took 23 minutes to do an emergency ascent from 100meters/330feet to the surface is worth noting. That seems like a long time.<br>
<br>
Thanks,<br>
Ian.<br>
<br>
<br>
------------------------------<br>
<br>
Message: 5<br>
Date: Wed, 4 Dec 2019 11:35:54 +1300<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Pressure resistant lie batteries<br>
Message-ID: <<a href="mailto:DC0C46BA-0B7C-4141-8B0C-49A1325D1FA9@yahoo.com" target="_blank">DC0C46BA-0B7C-4141-8B0C-49A1325D1FA9@yahoo.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Hi Beram,<br>
there is a firm that makes lithium battery packs for underwater use.<br>
<a href="https://www.swe.com/" rel="noreferrer" target="_blank">https://www.swe.com/</a><br>
What depth do you want them to go down to? How big a battery pack?<br>
I have cut open lithium iron & lithium polymer batteries & they look<br>
pretty pressure resistant. The lithium polymer with the soft flat packs look<br>
like they might take the pressure better than the Lithium iron in the cylindrical<br>
form. The latter having a hard case that might crush & damage the battery.<br>
I am not sure about lithium phosphate which is the preferred option for safety.<br>
I have a 48V 40Ah lithium phosphate battery that I run an inflatable on.<br>
What complicates matters is the wires coming from each cel for balance<br>
charging. I am not sure how you handle this. Perhaps encapsulate the balance<br>
charging electronics & leave it in the battery enclosure.<br>
Alan<br>
<br>
<br>
<br>
> On 4/12/2019, at 7:02 AM, Beram Mahmoud via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br>
> <br>
> Hello,<br>
> Does anyone know of an instruction how to make pressure resistant li batterie systems?<br>
> <br>
> Is it sufficient to fill up the battery with the bms in an oil filled canister?<br>
> <br>
> Best regards <br>
> Beram<br>
> <br>
> _______________________________________________<br>
> Personal_Submersibles mailing list<br>
> <a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br>
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Message: 6<br>
Date: Wed, 4 Dec 2019 11:41:29 +1300<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Pressure resistant lie batteries<br>
Message-ID: <<a href="mailto:4336E505-98F7-4B0C-95F7-23097A268047@yahoo.com" target="_blank">4336E505-98F7-4B0C-95F7-23097A268047@yahoo.com</a>><br>
Content-Type: text/plain; charset=us-ascii<br>
<br>
Beram,<br>
additionally, a lot of the balance charging electronic boards have large electrolytic<br>
capacitors & if you just stick them in oil they may collapse under pressure.<br>
Alan<br>
<br>
> On 4/12/2019, at 7:02 AM, Beram Mahmoud via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br>
> <br>
> Hello,<br>
> Does anyone know of an instruction how to make pressure resistant li batterie systems?<br>
> <br>
> Is it sufficient to fill up the battery with the bms in an oil filled canister?<br>
> <br>
> Best regards <br>
> Beram<br>
> <br>
> _______________________________________________<br>
> Personal_Submersibles mailing list<br>
> <a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br>
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End of Personal_Submersibles Digest, Vol 78, Issue 1<br>
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</blockquote></div></div>