[Oeva-list] Kokam batteries

[Myles Twete]

And of course, Victor Tikhonov has experience with EV-size Kokams and has developed a BMS for them ---  <http://www.metricmind.com> www.metricmind.com

-mt

 

 

From: Ron Jayasuriya [mailto:evmail4ron at yahoo.com] 
Sent: Wednesday, October 14, 2009 9:38 AM
To: oeva-list at oeva.org; Myles Twete
Subject: Re: [Oeva-list] Kokam batteries

 


If people are interested in Kokam batteries, there is a local ev owner who is using them.
Chris Morgan has a Porsche 911 with 100 Kokam cells powering an AC Propulsion system.  I did a little work to the car -- BMS related -- and got to drive it.  To this day it's still my favorite EV.  It was really fast, and had good range.  And it's a bright red Porsche, so it's fun to drive.  

A couple things about my limited experience with the Kokams:

the shape of the cells makes them a little hard to work with.  They are just a flat rectangle, maybe an inch thick.  Once they are wired together in series you can end up with a problem if you have to replace one of the batteries (or bms modules) in the middle of the chain.  You might have to start at the end and dismantle the whole thing to get to it, because of tight clearance for your tools.  Builders keep this in mind if you use these.  Ideally you'd build a box that allows enough clearance to access individual cells, but there are space constraints that can prevent this.

Also, when there was some uncertainty about one of these batteries it was unclear whether or not we could order a replacement.  But this may be because these batteries were limited production.

All that being said, the person who would really know is Chris Morgan.  He's had this car for a while and is in the Portland area.  I'll ask him to post to the oeva board on his experience.

I have also heard rumors that Kokam may be looking to offer a different line of EV batteries, and possibly sponsor an EV drag car that some of us have seen before.  Perhaps those who know more about this would like to post.

Ron

--- On Wed, 10/14/09, Myles Twete <matwete at comcast.net> wrote:


From: Myles Twete <matwete at comcast.net>
Subject: Re: [Oeva-list] Kokam batteries
To: oeva-list at oeva.org
Date: Wednesday, October 14, 2009, 3:57 PM

And Kokams have a long track record in the RC hobby---I’ve used them for many many years.

-MT

 

From: oeva-list-bounces at oeva.org [mailto:oeva-list-bounces at oeva.org] On Behalf Of Myles Twete
Sent: Wednesday, October 14, 2009 8:55 AM
To: oeva-list at oeva.org
Subject: Re: [Oeva-list] Kokam batteries

 

Oh, sorry --- when I said “performance list”, I meant that Kokam is a performance battery and company and not one of the ones that promised the moon.

I should have been clearer.

-MT

 

From: oeva-list-bounces at oeva.org [mailto:oeva-list-bounces at oeva.org] On Behalf Of Theoldcars at aol.com
Sent: Tuesday, October 13, 2009 11:38 PM
To: oeva-list at oeva.org
Subject: [Oeva-list] Kokam batteries

 

Hello Myles

 

I have not heard anything negative about Kokam batteries. There was a race car  <http://www.PROEVcom> www.PROEVcom  that was using them. I have not checked on that for some time. I have no idea what their prices are like. 

 

Don

 

In a message dated 10/13/2009 4:08:25 PM Pacific Daylight Time, oeva-list-request at oeva.org writes:

Great points Don.

Add to the disappointment list: The once promising Evercel Nickel Zinc
battery.

Add to the performance list: Kokam batteries and company

-Myles


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