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by Hacky
Sat Jan 15, 2022 3:20 am
Forum: Technical BMW i3 Discussions
Topic: Set a maximum charge limit
Replies: 25
Views: 4060

Re: Set a maximum charge limit

No EV manufacturer would allow its battery pack to charge to its absolute maximum voltage unless it supports limiting the top charge level when charging (e.g., Tesla). To do so would result in cell degradation that would make warranty replacement of many battery packs likely. The BMS limits the top...
by Hacky
Fri Jan 14, 2022 3:07 pm
Forum: Technical BMW i3 Discussions
Topic: Set a maximum charge limit
Replies: 25
Views: 4060

Re: Set a maximum charge limit

Yes, I also found this post from "Havrla", who is well known in Europe for his 60Ah -> 120AH battery upgrade skills. As I said already, I did not yet see OBD2 read outs for the 60 AH i3 and I have not yet seen the specs for the Samsung 60 Ah SDI cells. May be that for this one, there is some upper b...
by Hacky
Fri Jan 14, 2022 10:14 am
Forum: Technical BMW i3 Discussions
Topic: Set a maximum charge limit
Replies: 25
Views: 4060

Re: Set a maximum charge limit

You are basing your assertion on the output of the Electrified app that indicates a battery pack voltage of 402 V, and then you assume that this is the maximum possible voltage for a pack of 96 120 Ah cells. Pack voltage is temperature-dependent, so did you correct this voltage for the cell tempera...
by Hacky
Thu Jan 13, 2022 1:36 am
Forum: Technical BMW i3 Discussions
Topic: Set a maximum charge limit
Replies: 25
Views: 4060

Re: Set a maximum charge limit

Not this again. This is not a Tesla. There is a Battery Management System that prevents us from "fully" charging or discharging the battery. About 10% of the capacity is held back as a buffer for this. Dispite many other statements, the i3 does not hold back a buffer at the higher end of the cell v...

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