More details on the Samsung SDI 94 Ah battery cell
It’s not the first time that we found Samsung SDI 94 Ah battery cells on sale at online stores, but it’s the first time it happens at a reputable and well known source.
The price at ev-power.eu isn’t very friendly (162,69 € without VAT), but it’s always nice to at least have the opportunity to buy the battery cell from third-party suppliers if we really need to.
Below is the information we can find at the online store.
Li-Ion prismatic Samsung 94 Ah special cell for EV and energy storage applications provides long cycle life > 3.200 cycles by Nickel-cobalt-manganese (NCM) technology.
Technical specification:
- Nominal voltage of the cell is 3,7 V and the operational voltage is 2,75 V – 4,15 V.
- Recommend charging/discharging current is 0,33 C (31 A)
- Cycle life: 3.200 cycles at 80 % DoD (Deep of Discharge) up to 80 % residual capacity (at discharge current 94 A)
- Maximum discharge current is 1 C continuously and peak 4,3 C (413 A, <5 s).
- Maximum charging current is 0,5 C continuously
- Dimensions: 173 x 125 x 45 mm
- Weight: 2 Kg
- Charging temperature: 0° C ~ 60° C
- Discharging temperature: -25° C ~ 60° C
With these numbers we can calculate – the always interesting – energy density figures.
Gravimetric Energy Density: 173,9 Wh/kg
Volumetric Energy Density: 357,4 Wh/L
The energy density figures aren’t great, which gives Samsung SDI a lot of room for improvement. The long cycle life is without doubt, the strong point in these battery cells.
If we look to the BMW i3 battery pack, just the 96 battery cells used in it weigh 192 kg (96 x 2 kg), have a volume of 93,42 L (96 x 0,973125 L) and a capacity of 33,39 kWh (96 x 3,7 V x 94 Ah). However, when we put the battery cells in modules and add electronics such as a TMS and BMS, the battery pack becomes larger and heavier.
What’s interesting is that the recommended maximum charging current is only 0,5 C and we know that the BMW i3’s 33,39 kWh battery can be charged by a DC fast charger at 49,5 kW, which is roughly 1,48 C.
To sum up, while Samsung SDI battery cells have only average energy density, they are very durable and reliable. This is one of the reasons why I think that the BMW i3 battery is great and also why I recommend to buy an used Fiat 500e.
I’m curious to see which kind of new battery cells will BMW use in the upcoming BMW i3S with the larger capacity battery pack. If the rumored battery pack is around 50 kWh, it’s very likely it’ll get the new cylindrical 21700 cells and not the prismatic type – that has been used until now.
More info:
https://www.ev-power.eu/Li-Ion-special-cells/Samsung-Li-Ion-SDI-Battery-Cell-3-7V-94AH-NCM.html
http://www.samsungsdi.com/upload/ess_brochure/Samsung%20SDI%20brochure_EN.pdf
More info about those cells, more technical.
https://drive.google.com/open?id=0BzzOLtL0HXj4UURWOW16T3JqaVk
Do you have a similar level of detail on the 60Ah?
Unfortunately I haven’t, sorry.
The only detailed info available (got it from ebay seller) on the 60ah to my knowledge.
https://drive.google.com/open?id=0BzrjU6cctUq-VkRsWHFJc0xjNElIMTZGLTVQRXoxczhTWDZN
Hmmm if BMW were to switch to 21700 cells not sure if they could retrofit those in existing i3s which could cause an uproar …
I do not believe that BMW will switch to small cylindrical format before 2020 if ever. Most likely the next battery update will get 120 Ah Samsung-SDI prismatic cells.
“What’s interesting is that the recommended charging current is only 0,5 C and we know that the BMW i3’s 33,39 kWh battery can be charged by a DC fast charger at 49,5 kW, which is roughly 1,48 C.”
Why do you say this? The cels are not charged all in series… They are charged by blocs in series and each bloc in parallel with the others.
The cell config is 96s1p.
Correct.
In the BMW i3 all cells are connected in series.
Correct, I think BMW have done many experiments to prove the decayed cycle which can still satisfy the requirements of user if using fast charge.
If the i3s has 42 kWh, we may see the 120 Ah prismatic cells finally become reality.
96s1p: 96*3,65V*120Ah=42 kWh
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