Difference between revisions of "Battery/Cells"
From Unofficial Zero Manual
(extract from service manual)
Latest revision as of 20:52, 4 December 2019
- NMC Cell Chemistry
- The chemistry used is Lithium Nickel Manganese Cobalt: LiNiMnCoO2 ("NMC" or other rearrangements of those letters).
- NMC is a relatively new battery chemistry which differs from the Li-cobalt chemistry we are familiar with from mobile phone batteries and laptops.
- While Li-cobalt has a higher energy density than NMC (storage capacity per kilogram), it doesn't cycle as well and ages quicker.
- That's fine for a mobile phone that is likely to be obsolete after 2-3 years, but not for an electric bike.
- The automotive-grade NMC cells that Farasis supply should easily satisfy the requirements of the five year warranty that Zero are providing with their current Z-Force battery packs.
- It seems they should last 8-10 years if they aren't abused.
- Even if you start to notice some significant deterioration after five years, the rate at which battery technology is progressing means that you should be able to buy a new battery pack with much better capacity (range) than the original for less money.
|2009-2011||cylindrical||Molicel||IMR-26700A||Molicel 26700  ||2.9Ah||2.5V||3.8V||4.2V±50mV||26.4mm ⌀ × 70mm|
|2012||pouch||EIG||EIG C020||EIG NCM C020||20Ah||2.5V||3.65V||4.15V||130mm × 217mm × 7.2mm|
|2013-2014||Farasis||Farasis 25Ah||Farasis IMP06160230P25A 25Ah or alt||25Ah||2.0V||3.65V||4.15-4.20V||161mm × 230mm × 6mm|
|2015||Farasis 27Ah||27Ah (25Ah label)||161mm × 230mm × 6mm|
|2016-2017||Farasis 29Ah||29Ah (28Ah label)||160mm × 230mm × 6mm|
|2018||Farasis 32Ah||32Ah (? label)||160mm × 230mm × 6mm|
- Farasis Claims
- Per Farasis engineers and industry professionals:
- A solid cell, and are Farasis's oldest chemistry design.
- They are a manganese-rich cathode (NMC) 25Ah cell with excellent cycle life, and acceptable C-rate.
- An adaptation of the 25Ah cell chemistry with thinner foils and more of them.
- This means that there is more active materiel (more capacity) but less conductive path to get that capacity in and out.
- So for the slow discharge S/DS bikes, you get more capacity, but they are lower C rate, and cannot handle being used in the FX platform.
- Higher discharge rate (peak and continuous) than the 25Ah cell.
- More capacity than the 27Ah cell (especially at higher C rates/cooler temperatures).
- 10% capacity improvement and very likely lower internal resistance.
- Internal weight savings and better cooling are inferred.
|Cell||Continuous||Peak (10sec)||Max Burst||Maximum|
|25Ah||4C (100A)||7C (175A)||400A||1C (25A)|
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