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Post by kris on Nov 1, 2023 19:09:02 GMT
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Post by Telemachus on Nov 1, 2023 19:23:04 GMT
Interesting, although it is pretty vague about what actually happened.
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Post by on Nov 1, 2023 20:48:33 GMT
There are some clues
the battery energy storage system consisted of three battery packs from Shenzhen Basen Technology. He bought two in June 2022 and an additional one in June 2023 via the Alibaba
Right before the accident, the battery’s state of charge (SOC) was 90.2% and the voltage stood at 52.41 V.
...
Putting on my random thought process hat I reckon this was a NMC battery masquerading as an LFP battery it was overcharged and got the runaway.
Not done the math but it could turn out that the multiple cell format allows this..
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Post by Aloysius on Nov 1, 2023 21:02:51 GMT
You need a back-story for the supplier of the battery.
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Post by on Nov 1, 2023 21:08:29 GMT
I've always idly wondered how one would prove what cells were in a battery if it was deliberately made rather awkward to open.
The 52.4v figure is interesting.
I have experienced a thermal runaway on a small Nickel Manganese Cobalt chemistry battery. A jump starter pack. They don't like being overcharged.
If the SOC monitor was set assuming it was LFP but it was actually NMC then it could be erroneous and allow an overcharge.
Explosion destroying house sounds a bit ott but you never know.
If it was in America one could surmise it was the arsenal being kept too close to the batty which caused the issue.
Not sure if the krauts are allowed to keep enough explosives and armaments do destroy a medium sized town in their houses for self defence.
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Post by Telemachus on Nov 1, 2023 21:28:28 GMT
There are some clues the battery energy storage system consisted of three battery packs from Shenzhen Basen Technology. He bought two in June 2022 and an additional one in June 2023 via the Alibaba Right before the accident, the battery’s state of charge (SOC) was 90.2% and the voltage stood at 52.41 V. ... Putting on my random thought process hat I reckon this was a NMC battery masquerading as an LFP battery it was overcharged and got the runaway. Not done the math but it could turn out that the multiple cell format allows this.. 52.41v / 16 (ie a nominal 48v battery) = 3.27v which is compatible with a 90.2% SoC for lfp. |
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Post by on Nov 1, 2023 21:54:43 GMT
I think it would be possible to emulate this with a NMC battery in order to pretend it was a LFP battery. There are enough cells for it to match up.
Its not impossible that given the bad press around the cobalt thing there could be a financial incentive for unscrupulous and rather worthless Inconsequential nobodies to attempt to gain from this.
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Post by Aloysius on Nov 1, 2023 21:58:20 GMT
It's a good start but we need more detail
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Post by on Nov 1, 2023 22:07:36 GMT
It's a good start but we need more detail 13S NMC would add up and is less tolerant of overcharging. This is the format for millions of ebike batteries which must come orf the production lines at a rate of knots. Oversupply and seconds will find their way into products. I reckon 3 or 4 normal ebike batteries could quite easily be disguised as an LFP battery. One would need to check. |
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Post by kris on Nov 1, 2023 22:16:36 GMT
It's a good start but we need more detail I imagine the details will be published by the same website when the enquiry is done. |
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Post by Aloysius on Nov 1, 2023 22:20:37 GMT
It's a good start but we need more detail I imagine the details will be published by the same website when the enquiry is done. Yebbut I'm more interested in the Crosby theory. Reality is irrelevant. |
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Post by on Nov 1, 2023 22:25:16 GMT
It was the boiler.
Everyone is very excited about all these batteries but at the end of the day the boiler was probably gas and gas accumulates then it blows up.
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Post by kris on Nov 1, 2023 22:30:49 GMT
It's a good start but we need more detail 13S NMC would add up and is less tolerant of overcharging. This is the format for millions of ebike batteries which must come orf the production lines at a rate of knots. Oversupply and seconds will find their way into products. I reckon 3 or 4 normal ebike batteries could quite easily be disguised as an LFP battery. One would need to check. seconds is a good bet as these Chinese sites sell B stock. I doubt they where mnc though. Instal error would be my guess. He had a lot of kw of solar for the battery size so an overcharge would be possible. |
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Post by on Nov 1, 2023 22:34:26 GMT
Yes but the explosive force needed to break up concrete is quite serious.
I wonder if the kraut car makers are realigning their corporate strategies in favour of infernal combustion engines and looking for something to diss the electric kids with.
Wasn't tesla buying BYD blade LFP batteries for their cars?
Surely not.
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Post by kris on Nov 1, 2023 23:28:21 GMT
Yes but the explosive force needed to break up concrete is quite serious. I wonder if the kraut car makers are realigning their corporate strategies in favour of infernal combustion engines and looking for something to diss the electric kids with. Wasn't tesla buying BYD blade LFP batteries for their cars? Surely not. The amount of energy stored in 14.4 kWh of batteries is quite serious. I agree it is quite unusual for it to be released in an explosive manner rather than burning. |
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