100+kWh energy after full charge on SR

[msadan]

I've been tracking the energy value shown after a charge to 100% for about a year and a half now. It's always been between 93.5 - 97.1 kWh (SR battery pack), with lower values corresponding to lower temperatures and higher values with higher temps. This is the first time I've ever seen it exceed the pack's rated usable capacity (98 kWh). With the battery's SOH at 98% I would have expected it to max out at around 96 kWh. Temperature was around 70 degrees, so pretty much ideal conditions. I realize that these values are all just estimates, but I thought it was interesting.

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[joshtb86]

i noticed similar, with my 123 kwh battery, it charged to 125 the last time i full charged it

 

[On the Road with Ralph]

You do understand that the actual size of the battery pack is larger than its usable capacity, right? There is a buffer built-in, both at the top and bottom of the range, to help preserve battery life.

 

[msadan]

You do understand that the actual size of the battery pack is larger than its usable capacity, right? There is a buffer built-in, both at the top and bottom of the range, to help preserve battery life.

I do, that's why I referenced "rated usable capacity" in my original post. My point was that I found it interesting that the truck seemed to be using more than 100% of the battery's usable capacity, and that I had not seen that behavior before.
If the truck is in fact charging the pack to more than 100% of its usable capacity, that would mean that it's using part of that buffer, which would seem to defeat the purpose of the buffer.

 

[On the Road with Ralph]

If the truck is in fact charging the pack to more than 100% of its usable capacity, that would mean that it's using part of that buffer, which would seem to defeat the purpose of the buffer.

There has been some speculation the BMS is programmed to incrementally release part of the buffer as the battery ages to preserve range. I don’t think Ford has ever confirmed that theory, however.

 

[Kev12345]

There has been some speculation the BMS is programmed to incrementally release part of the buffer as the battery ages to preserve range. I don’t think Ford has ever confirmed that theory, however.

makes total sense to avoid battery warranty claims. full access to battery after 8 years maybe?

 

[Zprime29]

makes total sense to avoid battery warranty claims. full access to battery after 8 years maybe?

I'd rather keep the buffer as it is. Range is fine, loss of capacity is so low that it really isn't a problem. Plus, I like knowing that I have that buffer every time I charge to 100%. It's just safer with this chemistry.

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