Page 4 of 5

Re: Cost to replace an i-miev battery?

Posted: Thu Mar 12, 2020 1:36 am
by Enginerd
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.

Re: Cost to replace an i-miev battery?

Posted: Fri Mar 13, 2020 5:43 am
by Enginerd
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.

Re: Cost to replace an i-miev battery?

Posted: Mon Mar 16, 2020 8:02 am
by Enginerd
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.

Re: Cost to replace an i-miev battery?

Posted: Sat Mar 21, 2020 12:13 pm
by Enginerd
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/

Re: Cost to replace an i-miev battery?

Posted: Sat Mar 21, 2020 1:32 pm
by PV1
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/

Re: Cost to replace an i-miev battery?

Posted: Sun Mar 22, 2020 6:37 am
by datom
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

Re: Cost to replace an i-miev battery?

Posted: Sun Mar 22, 2020 8:29 am
by kiev
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/

Re: Cost to replace an i-miev battery?

Posted: Sun Mar 22, 2020 9:26 am
by datom
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.

Re: Cost to replace an i-miev battery?

Posted: Thu Mar 26, 2020 7:21 pm
by Enginerd
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.

Re: Cost to replace an i-miev battery?

Posted: Thu Mar 26, 2020 8:45 pm
by jray3
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.