EV Calculated energy vs advertised

962 Views 5 Replies 5 Participants Last post by seza, Sep 18, 2019

seza

Discussion Starter · Sep 15, 2019

Hi All,

I am bit puzzled and confused about my Electric van,

I recently bought a 2013 Ford connect Electric van with an "advertised" energy capacity of 28KWh,
I am just reading a leaflet about the vehicle detailing the battery configuration as follow and I quote

" The high voltage battery pack consists of two strings of 8 battery modules in parallel.
Each module is comprised of 12 lithium ion, 4V batteries in series.
The total voltage of the battery pack is 384VDC when fully charged,
290VDC when discharged (345.0 VDC nominal)"
Assuming they are using 18650 with highest energy of 5AH that work out to less than 4KWh! ... where is the 28KWh come from?
The van drive beautifully with a good range for the age and weight ...
Unfortunately - the co that developed the van is now out of business (Azure Dynamics) so I am left having to ask good people like yourselves for help,

Many thanks

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1 - 6 of 6 Posts

Emyr

· #2 · Sep 15, 2019

seza said:
Assuming they are using 18650

Have you checked? Sounds like this assumption may be incorrect.

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brian_

· #3 · Sep 15, 2019

seza said:
I recently bought a 2013 Ford connect Electric van with an "advertised" energy capacity of 28KWh,
I am just reading a leaflet about the vehicle detailing the battery configuration as follow and I quote

" The high voltage battery pack consists of two strings of 8 battery modules in parallel.
Each module is comprised of 12 lithium ion, 4V batteries in series.
The total voltage of the battery pack is 384VDC when fully charged,
290VDC when discharged (345.0 VDC nominal)"
Assuming they are using 18650 with highest energy of 5AH that work out to less than 4KWh! ... where is the 28KWh come from?
The van drive beautifully with a good range for the age and weight ...
Unfortunately - the co that developed the van is now out of business (Azure Dynamics) so I am left having to ask good people like yourselves for help...

Emyr said:
Have you checked? Sounds like this assumption may be incorrect.

I agree with Emyr - that's a wildly inappropriate assumption. Almost no one other than Tesla uses (or has ever used) 18650 cells in a production EV. I've never heard of an Azure Dynamics vehicle using 18650s.

A module is not composed of batteries, it is composed of cells, so the author of the quoted information is suspect. Taking their values as correct anyway, the nominal capacity is 28 kWh / 345 V = 81 Ah; since there are two strings in parallel, that implies 40 Ah cells... which has been a common size in both pouch and prismatic cells.

Various sources reported when this vehicle was new that the cells from from Saft; however, they have produced cells in so many chemistries, sizes, and formats that it's hard to tell what these might be, without an information source specific to the AZD Transit Connect.

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Vendition

· #4 · Sep 17, 2019

Did you cross-check it may be you assumed wrongly?

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Hollie Maea

· #5 · Sep 18, 2019

seza said:
Assuming they are using 18650 with highest energy of 5AH that work out to less than 4KWh!

As several have already pointed out, this assumption is almost certainly incorrect and if they WERE using 18650s they would use many in parallel to get the Ah up where they want it.

But I also need to point out: If anyone is advertising 5Ah 18650s, they are scamming. None exist on the market with that level at the moment. Counterfeiters commonly give ridiculous ratings like this, so it's a good indicator to stay far away.

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seza

Discussion Starter · #6 · Sep 18, 2019

Thank you - all guys,
yes I think my assumption is way out,
Unfortunately - scarce information available pertaining to this vehicle.

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