80km range imiev in winter

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offgridQLD
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80km range imiev in winter

Post by offgridQLD » Sat, 14 Nov 2015, 14:29

Yes, my thinking is if you have charged a lot with DC fast charging (not to 100%) and perhaps combined that with AC charging but also not to 100%. You car might be missing out on regular ballancing. That from my understanding happens towards the bottom end of AC charging as the current backs down.

Worth a try any how. Do several charges to 100% until the charger stops then after driving some (say 20% down) or whatever is practical get it back on charge again to 100%.

I remember a imiev owner in Adelaide had a out of balance cell (on a near new imiev) and he was able to trim it back inline by doing more 100% SOC cycle's.

Remember AC motor charges to 100% regularly, I do somewhat regualy and have no balance isues even at low SOC.

Kurt
Last edited by offgridQLD on Sat, 14 Nov 2015, 03:31, edited 1 time in total.

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80km range imiev in winter

Post by g4qber » Thu, 17 Dec 2015, 23:26

http://www.flux-capacitor.co.uk/the-car-history.php

my imiev now has the range of the original lead acid batteried enfield 8000
2011 i-MiEV - k kms 217

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offgridQLD
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80km range imiev in winter

Post by offgridQLD » Thu, 17 Dec 2015, 23:55

Pull the battery out and replace the sick cell you were talking about. If its not already out of warranty it doesn't matter as the warranty isn't worth the paper it's written on.

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80km range imiev in winter

Post by jonescg » Fri, 18 Dec 2015, 00:28

There looks to be a huge market for re-packaging iMiEV batteries. These 260+ Wh/kg cells I'm testing might do it, but it will be tricky to get the form factor right.
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80km range imiev in winter

Post by reecho » Fri, 18 Dec 2015, 00:30

Looks like Joseph will be the guinea pig I guess.... Image

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80km range imiev in winter

Post by offgridQLD » Fri, 18 Dec 2015, 00:56

Form factor the Imiev cells are shaped like a brick. I thaught that was easy.

I worked out once using a few 18650's I had laying around that you could easily pack enough of them in the same space as one cell to give you about 70+ ah vs the 50 of the stock cells.

Though most of us are not having any issues with the pack to warrant playing around with it. I would be more interested to know why his bank and any other pack that's not performing well is the way it is. It cant be High km as there are several kicking about doing much better with 80k+ km abroad and in Au. It cant be time as there are several older doing much better. Perhaps heat, fast charging, racing it or just bad luck.

Kurt

Last edited by offgridQLD on Thu, 17 Dec 2015, 13:58, edited 1 time in total.

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80km range imiev in winter

Post by Adverse Effects » Fri, 18 Dec 2015, 01:22

i am guessing pack abuse (racing and fast charging) leading to 1 or more cells in distress and damaged

to me it sounds like a awesome candidate for 18650 trial replacement cells

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80km range imiev in winter

Post by jonescg » Fri, 18 Dec 2015, 02:08

Racing wouldn't damage the battery unless he was doing so at high speeds. Most of the stuff Joseph does at the RAC track is short tight stuff. Fast charging maybe, but it's not at high rates of charge for very long. This might lead to less balancing but provided he plugs it in each night it should do that regardless.

18650s or pouches - both are feasible. The car is still perfectly fine. Although swapping out a dud cell would be a lot easier.
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80km range imiev in winter

Post by offgridQLD » Fri, 18 Dec 2015, 02:41

Heat is the killer of any battery.

If your racing around a track your discharge the pack fast.Hard acceleration then hard regen over and over. Then charging it and doing it all over again for the next race. Or going on day long trips with your car topped up all the time with a fast charger the battery dosn't get a chance to cool.

Driving for 30min to work in the morning then 30 min in the afternoon would be a lot easier on the bank with a cool down period in between and no fast charging.

Where is his car stored in the day time most of its life.

Just comparing it to Acmotors car that's done more KM and is significantly more healthy. Same climate.

Edit: Though one dud cell (if that can be confirmed) sound like bad luck more than anything.

Kurt

Last edited by offgridQLD on Thu, 17 Dec 2015, 15:44, edited 1 time in total.

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80km range imiev in winter

Post by g4qber » Fri, 18 Dec 2015, 13:16

viewtopic.php?title=malm-2011-imiev-por ... 60&start=3

Cell 17 was already low before fast charging.

I tend to get the duds.
eg. Volt issues.

3 cases so far
a) Ant
b) sky logger
c) myself

2 cases of DOA traction battery before resale
d) 2010 imiev - Paceway DOA battery replaced and sold Nov '15
e) alleged 2010 imiev in eastern states with similar issue, battery was supposed to be for Perth imiev but was redirected for the eastern states imiev.

less 2010 imiev cases possibly due to senior owners driving at 60kmh.

http://www.aeva.asn.au/content/you-might-well-i-miev
looks like the 3 of us have reached the 7 year 80km range mark in 4 years
Last edited by g4qber on Fri, 18 Dec 2015, 02:46, edited 1 time in total.
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80km range imiev in winter

Post by g4qber » Thu, 04 Feb 2016, 00:49

http://www.businessinsider.com.au/how-t ... car-2016-1

hopefully I'll still be able to get 80km in the middle of winter 2016
... by travelling at 50kmh.
Last edited by g4qber on Wed, 03 Feb 2016, 13:49, edited 1 time in total.
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80km range imiev in winter

Post by offgridQLD » Thu, 04 Feb 2016, 02:21

In QLD we don't see much difference over winter. A slight 1 or 2% perhaps.

Kurt

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80km range imiev in winter

Post by g4qber » Thu, 24 Mar 2016, 20:44

Getting 106-118 km RR now after recalibration at Paceway Mitsubishi

Car feels more zippy now.
Cell 18 lowest. But this was already the case before recal.
Cell 17 was lowest previously
Last edited by g4qber on Thu, 24 Mar 2016, 09:46, edited 1 time in total.
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80km range imiev in winter

Post by mikedufty » Fri, 25 Mar 2016, 05:48

Was the recalibration part of the normal servicing schedule, or something special you had them do?

They are bugging me to get ours serviced at the moment. Every 6 months seems excessive to me, though that is what the book says.

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80km range imiev in winter

Post by reecho » Fri, 25 Mar 2016, 18:46

mikedufty wrote: Was the recalibration part of the normal servicing schedule, or something special you had them do?

They are bugging me to get ours serviced at the moment. Every 6 months seems excessive to me, though that is what the book says.


No. He requested it from the dealer.

After his run this morning no extra range was observed...

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80km range imiev in winter

Post by g4qber » Fri, 25 Mar 2016, 23:27

My service is 12 months. Got 73.3km when turtle appeared. Travelled till 81.1 km. 6 bars on energy meter but cell 18 shot

Image
Image
Image
Last edited by g4qber on Sun, 27 Mar 2016, 17:36, edited 1 time in total.
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80km range imiev in winter

Post by offgridQLD » Wed, 30 Mar 2016, 20:46

Car in turtle at 42.5% SOC i think the problem is clearly a pack let down by a sick cell triggering cell level LV point.

Canion shows that very well.

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Post by antiscab » Fri, 01 Apr 2016, 05:28

There's several cells there that aren't far behind
Matt
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Post by offgridQLD » Fri, 01 Apr 2016, 13:40

True, but over 40% SOC on the bank and hitting LVD/ turtle is not good. To date I have been shocked at how flat the cells are in the Imiev from 100% SOC all the way down to very low SOC.

I would like to see the cells capacity tested on the bench individually to know the true story.

To date no one I know of has done that.

Kurt


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Post by Johny » Fri, 01 Apr 2016, 14:15

This is probably obvious but have you left it on charge for a few days in an effort to balance out the pack?

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Post by offgridQLD » Fri, 01 Apr 2016, 14:49

Johny, The Imiev looks like it balances at all stages of charge. That said yes you can see straight away at the top if its balanced or not. I have never seen seen more than 5mv between all 88 cell at 100% SOC.

Can you show us a screen shot of the cell voltages from canion at 100% SOC? g4qber.

Something is adrift considering the dash gauge is showing just under 1/2 full and your hitting turtle. the calibration is way out.

conspiracy theory......Mitsubishi motors probably tweak the car every time you take it to them to make it live a shorter life. Considering the Imiev was only a compliance car they probably just want to see the end of them.

Time will tell when My Imiev gets to the same age as I have never let them touch it Image

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80km range imiev in winter

Post by Malm » Fri, 01 Apr 2016, 15:48

The i-MiEV battery of G4qber needs replacement. Some cells are much more weaker then the others, probably internal cells that heat more then the external cells. The car in not capable of getting the SoC correctly because of the different capacity of the cells. It says 42,5% when it is very close to 0%. That battery is over. If in warranty, you should receive a new one. A car can´t stop at 40% SoC. This is simply what you have to say that you have something wrong with your car, and I know its the battery.
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80km range imiev in winter

Post by Malm » Fri, 01 Apr 2016, 16:00

I bet that at 100% SoC G4qber battery is with all cells over 4,08V, well balanced. The problem is that the cells suffered from differential degradation, and some have now much less capacity then others, and will reach faster the lower limit of voltage.
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80km range imiev in winter

Post by Malm » Fri, 01 Apr 2016, 16:08

That recalibration was a disaster. Now the car thinks that can do 110 km when it is only capable of doing 70 km. It was much better before. I think the remaining capacity of your battery should be now bellow 30 Ah, with only 60% of the original capacity.
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80km range imiev in winter

Post by zzcoopej » Fri, 01 Apr 2016, 16:17

Malm wrote: the remaining capacity of your battery should be now bellow 30 Ah


Yes, gw4ber's battery capacity is 27Ah and the value is the lowest currently showing on the EvBatMon graph (27Ah, 84450km).
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