[PSUBS-MAILIST] Pressure resistant lie batteries

[David Colombo via Personal_Submersibles]

Be prepared to pay a pretty penny for the SWE batteries. Last time I
checked they were going to cost more than the submarine. Other option would
be "Battle Born" batteries with build in BMS and build your own pressure
case if you really need them to go outside the pressure hull. These LiFePo4
batteries also come with a 10yr warranty which is certainly worth looking
into.

https://battlebornbatteries.com/

Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com



On Tue, Dec 3, 2019 at 2:37 PM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Beram,
> there is a firm that makes lithium battery packs for underwater use.
> https://www.swe.com/
> What depth do you want them to go down to? How big a battery pack?
> I have cut open lithium iron & lithium polymer batteries & they look
> pretty pressure resistant. The lithium polymer with the soft flat packs
> look
> like they might take the pressure better than the Lithium iron in the
> cylindrical
> form. The latter having a hard case that might crush & damage the battery.
> I am not sure about lithium phosphate which is the preferred option for
> safety.
> I have a 48V 40Ah lithium phosphate battery that I run an inflatable on.
> What complicates matters is the wires coming from each cel for balance
> charging. I am not sure how you handle this. Perhaps encapsulate the
> balance
> charging electronics & leave it in the battery enclosure.
> Alan
>
>
>
> On 4/12/2019, at 7:02 AM, Beram Mahmoud via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hello,
> Does anyone know of an instruction how to make pressure resistant li
> batterie systems?
>
> Is it sufficient to fill up the battery with the bms in an oil filled
> canister?
>
> Best regards
> Beram
>
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