Enginerd
Posts: 7
Joined: Fri Mar 06, 2020 5:44 am

Re: Cost to replace an i-miev battery?

Thu Mar 12, 2020 1:36 am

dracekvo wrote:5000mAh (5Ah) 18650 doesn`t exists.

But. cappacity isn`t everithing.
Odher parametters is important too. Maximum charger and discharge current.

I find only one 18650 cells whot can yous in ION because have hign charge/discharge current is Molicel.
https://eu.nkon.nl/rechargeable/li-ion/ ... ah-5a.html

But better fit in LEV50 dimension 21700
https://eu.nkon.nl/rechargeable/li-ion/ ... h-30a.html


Thanks for the advice. I did edit my post having realised I was looking at fake cells.
RE: your 21700 link. To replace the entire battery pack of an I-miev, equal the cars original capacity, with these would cost around £4,250 just for the cells. This is pretty good.
£5000 seems to be a consistent figure wherever I look and which ever form factor the (genuine) batteries come in.

Battery prices are meant to be falling rapidly. Perhaps high demand is what is keeping the consumer retail price up.
Either way, there doesn't seem to be any substantial support for the battery packs for these cars yet.

Enginerd
Posts: 7
Joined: Fri Mar 06, 2020 5:44 am

Re: Cost to replace an i-miev battery?

Fri Mar 13, 2020 5:43 am

Posting this thread here as we're likely going over a lot of old ground already covered otherwise.

viewtopic.php?f=23&t=2124

What we're really waiting for in 2020 is this fated reduction in battery cost to filter down to us lowly home gamers.

Enginerd
Posts: 7
Joined: Fri Mar 06, 2020 5:44 am

Re: Cost to replace an i-miev battery?

Mon Mar 16, 2020 8:02 am

20 x 21700 LG M-50 cells ordered and on their way for initial testing.

This is enough for a 100 Ah cell, double the capacity of the LEV-50 used in the car currently, lighter and in the same form factor.
If I can get it to work, a full pack (at the price I paid for 20) would cost £5200 just in cells!! but give the car a real world range of about 170 miles.

Of course I could assemble replacement cells with the original capacity for half that initially, £2,600 or less.
Could even design the packs to be upgradeable at a later date by doubling up on cells.

This will definitely be a fairly expensive project... Still doing it though.

Enginerd
Posts: 7
Joined: Fri Mar 06, 2020 5:44 am

Re: Cost to replace an i-miev battery?

Sat Mar 21, 2020 12:13 pm

Anyone got first hand experience of a decent spot welder to put batteries together with?

Looking at this at the moment...
https://malectrics.eu/product/diy-ardui ... lt-kit-v3/

PV1
Site Moderator
Posts: 3055
Joined: Fri Apr 27, 2012 4:22 pm
Location: Pittsburgh, PA

Re: Cost to replace an i-miev battery?

Sat Mar 21, 2020 1:32 pm

Enginerd wrote:Anyone got first hand experience of a decent spot welder to put batteries together with

Yes. I have a KWeld unit. Made in Germany and works really well. I bought it to build an eBike battery. Two pieces of advice: make sure the charge/discharge rates on the cells are compatible with the car (125 amps on quick charge, up to 150 amps discharge), and make sure whatever you use to build the packs, be it nickel strips or something heavier duty, can handle the amperage. The mistake I made with my eBike pack is that the strips are too thin and get warm under load.

For best results, purchase the KWeld, KCap, and KSupply modules. The KSupply is made for specific power supplies, but can take any 12 volt source (I use a small lead acid battery as a source, but the KCap does all the work).
https://www.keenlab.de/index.php/produc ... plete-kit/
https://www.keenlab.de/index.php/produc ... or-module/
https://www.keenlab.de/index.php/product/ksupply/
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015
"Photon" - 2017 Bolt EV LT in Orange with QC - 7/31/2017

Solar-powered since 10/10/2013

datom
Posts: 15
Joined: Wed Apr 11, 2018 8:01 am

Re: Cost to replace an i-miev battery?

Sun Mar 22, 2020 6:37 am

Enginerd wrote:Anyone got first hand experience of a decent spot welder to put batteries together with?

Looking at this at the moment...
https://malectrics.eu/product/diy-ardui ... lt-kit-v3/


Very cheap solution, not verified by me (german language, but you get the idea): https://www.youtube.com/watch?v=hWTkI6_OeNc

kiev
Posts: 1165
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Cost to replace an i-miev battery?

Sun Mar 22, 2020 8:29 am

That is a very quick and simple spot welder. Was there any sort of resistor underneath the clear RTV and black tape, and what was the purpose of the 2 tiny wires on the supercap?

Here's a couple of spot welder links also:
https://www.sunkko.net/sunkko-709ad-pul ... elder.html

and a diy Arduino-based (controlled weld time) on instructables
http://www.youtube.com/watch?v=3RLVuy5PUKo

https://www.tindie.com/stores/KaeptnBalu/
kiev = kenny's innovative electric vehicle

datom
Posts: 15
Joined: Wed Apr 11, 2018 8:01 am

Re: Cost to replace an i-miev battery?

Sun Mar 22, 2020 9:26 am

kiev wrote:That is a very quick and simple spot welder. Was there any sort of resistor underneath the clear RTV and black tape, and what was the purpose of the 2 tiny wires on the supercap?


It is just a battery connected in parallel to the supercap. The wires were intended to check voltage, but he did not use them.

Enginerd
Posts: 7
Joined: Fri Mar 06, 2020 5:44 am

Re: Cost to replace an i-miev battery?

Thu Mar 26, 2020 7:21 pm

PV1 wrote:Yes. I have a KWeld unit. Made in Germany and works really well. I bought it to build an eBike battery. Two pieces of advice: make sure the charge/discharge rates on the cells are compatible with the car (125 amps on quick charge, up to 150 amps discharge), and make sure whatever you use to build the packs, be it nickel strips or something heavier duty, can handle the amperage. The mistake I made with my eBike pack is that the strips are too thin and get warm under load.

For best results, purchase the KWeld, KCap, and KSupply modules. The KSupply is made for specific power supplies, but can take any 12 volt source (I use a small lead acid battery as a source, but the KCap does all the work).
https://www.keenlab.de/index.php/produc ... plete-kit/
https://www.keenlab.de/index.php/produc ... or-module/
https://www.keenlab.de/index.php/product/ksupply/


I have heard good things about this kit before, along with some damning reports about the Chinese units doing the rounds, so I've ordered one. Thank you for posting the links.

jray3
Posts: 1700
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Cost to replace an i-miev battery?

Thu Mar 26, 2020 8:45 pm

Good luck to you, Enginerd! The similar Aussie effort has stalled, and now that I have a 75 mile one-way commute, MR BEAN in on greatly reduced duty, only doing about 250 miles per week of wifely driving, while I do that much per day on a 27 kWH Kia SOUL and my company car, a z2012 LEAF that we have upgraded to 40 kWH with an 2018 battery.
2012 i-SE "MR BEAN" 110,300 miles
2016 KIA SOUL EV, 90 kW, 27 kWh, 34k miles
2000 Mazda Miata EV, 78 kW, 17 kWh
1983 Grumman Kurbwatt EV,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh

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