Battery pack corrosion

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Nagaman
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Battery pack corrosion

Post by Nagaman »

Apparently, over time the ‘sealed’ pack, in fact, breathes and thus moisture is absorbed into the pack in time and can be identified on the cell top.
Bjorn talks to a repair tech about the repair task - https://youtu.be/_Vd4Is5QFME

Fording a stream with a pack a normal operating temperature would be something to avoid in that case.
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brendon_m
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Re: Battery pack corrosion

Post by brendon_m »

Careful with that video, you'll trigger @jonescgs PTSD that was created by the prelude battery
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jonescg
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Re: Battery pack corrosion

Post by jonescg »

*triggered*
AEVA National President, retiring WA branch chair.
Nagaman
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Re: Battery pack corrosion

Post by Nagaman »

So this raises the question as to what capability the cybertruck will have ….or be restricted to.
Maybe one of the issues slowing the mass production stage is that relating to stream crossings at high water/pack temperature variation. Would a breather running up the B pillar be a safe enough long term solution ?
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brendon_m
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Re: Battery pack corrosion

Post by brendon_m »

It's not what Tesla do but there are other manufacturers that have fully sealed (and pressurized) packs. Those packs would be fully submersible without issue.
antiscab
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Re: Battery pack corrosion

Post by antiscab »

I could see future servicing involving re-pressurising the sealed battery

they could use the zoe approach, and refridgerate the battery using air as the medium - that gets naturally dried and can still be sealed (or at least snorkled)
Matt
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2007 vectrix - 193'000km
2000 prius - has 200 x headway 38120 cells
Nagaman
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Re: Battery pack corrosion

Post by Nagaman »

brendon_m wrote: Thu, 04 Aug 2022, 17:30 It's not what Tesla do but there are other manufacturers that have fully sealed (and pressurized) packs. Those packs would be fully submersible without issue.
I guess mass production perfection has been achieved now and thus there is no need to worry about corrosion.
In the case of the latest Model Y, it’s such a plastic glue brick, there is probably no exposed cell surface left.
sleeperpservice
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Re: Battery pack corrosion

Post by sleeperpservice »

brendon_m wrote: Thu, 04 Aug 2022, 17:30 It's not what Tesla do but there are other manufacturers that have fully sealed (and pressurized) packs. Those packs would be fully submersible without issue.
There have been a few complaints about 2020 Ioniqs that rapidly change elevation having a big clunking sound come from under the car traced to the sealed battery pack expanding or contracting
Nagaman
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Re: Battery pack corrosion

Post by Nagaman »

sleeperpservice wrote: Fri, 05 Aug 2022, 11:11 There have been a few complaints about 2020 Ioniqs that rapidly change elevation having a big clunking sound come from under the car traced to the sealed battery pack expanding or contracting
Well that raises the question as to what pressure they are seized at ; ISA 1013 hpa or ambient pressure (surely not).
Oil-canning would be a bit of a startling interruption……and I’ve never heard this with either of our cars.
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