In my limited time here while considering a purchase i have come to appreciate the knowledge and discussion on the battery pack, it of course being a critical component to long term ownership happiness.
What I THOUGHT the SoH report indicated was the current battery pack capacity by cell pack. In other words, that if a battery pack when it is new offers 100% of its useable storage, that any number lower than that on the SoH readout meant that some of the capacity had indeed been lost, as is the case over time. Obviously there will be some, but you want it to be as little as possible.
The way it is being presented to me by the dealer and tech (which i should mention i have no reason to doubt, they’ve been very open with the info) is that it represents the value versus the car’s reported state of charge. In other words, if the car reports it is 100% charged, you want all 36 cells in that report to show 100% as well, However if the car is reporting it is 90% charged, the SoH report will show all cells at 90% as well and that’s perfectly fine. It would be an issue only if they car was showing 90% and one of more cells were showing less than 90%. But in that case it is not a concern that they do not show higher than 90%. Or if the car is reporting 100% charged and the SoH shows something in the low 90s.
so, in my thinking, regardless of the charge level of the car, my expectation is the SoH value is the lifetime capacity of the pack and you would want it to show 100%, Yes, its only charged to x% but it has 100% of its capacity available.
In the way it is being explained to me, it reflects the state of charge of the battery and you want it to match what the charge level is. The delta between the reported value and the charge level is the health degradation. So, if the charge level of the car is reported to be 90%, and the SoH reports shows all cells at 89%, then yes, you have lost 1%.
is one of those ways the correct understanding, if so which? Or is it something else.
Thanks so much.
What I THOUGHT the SoH report indicated was the current battery pack capacity by cell pack. In other words, that if a battery pack when it is new offers 100% of its useable storage, that any number lower than that on the SoH readout meant that some of the capacity had indeed been lost, as is the case over time. Obviously there will be some, but you want it to be as little as possible.
The way it is being presented to me by the dealer and tech (which i should mention i have no reason to doubt, they’ve been very open with the info) is that it represents the value versus the car’s reported state of charge. In other words, if the car reports it is 100% charged, you want all 36 cells in that report to show 100% as well, However if the car is reporting it is 90% charged, the SoH report will show all cells at 90% as well and that’s perfectly fine. It would be an issue only if they car was showing 90% and one of more cells were showing less than 90%. But in that case it is not a concern that they do not show higher than 90%. Or if the car is reporting 100% charged and the SoH shows something in the low 90s.
so, in my thinking, regardless of the charge level of the car, my expectation is the SoH value is the lifetime capacity of the pack and you would want it to show 100%, Yes, its only charged to x% but it has 100% of its capacity available.
In the way it is being explained to me, it reflects the state of charge of the battery and you want it to match what the charge level is. The delta between the reported value and the charge level is the health degradation. So, if the charge level of the car is reported to be 90%, and the SoH reports shows all cells at 89%, then yes, you have lost 1%.
is one of those ways the correct understanding, if so which? Or is it something else.
Thanks so much.
