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Today's Topics:

   1. Re: Charger ([EMAIL PROTECTED])
   2. Re: Balancing A123 cells (Jon Glauser)
   3. Re: Battery Cell Connection ([EMAIL PROTECTED])
   4. Re: Fwd: Battery prices ([EMAIL PROTECTED])
   5.  Motor Disassembly Question (gottdi)
   6.  Motor Disassembly Question (gottdi)


----------------------------------------------------------------------

Message: 1
Date: Sun, 6 Jan 2008 14:05:42 EST
From: [EMAIL PROTECTED]
Subject: Re: [EVDL] Charger
To: ev@lists.sjsu.edu
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="US-ASCII"

 
<<<<know you know all about how to build a dumb charger so  you may be 
looking for something smarter, but I still think one of the best buys  on a 
general 
purpose battery charger is the Schumacher: SE-1072 found here  
http://www.batteryservice.com/products_final.aspx?Category=Charger&ModelNumber=SE-1072

In  fact I just ordered another one.  Now you may say to yourself, well it is 
 only a 72 volt charger>>>>
 
 
 
Hello;
I am in the process of building a 120 volt EV.  I already have a 48  volt 
charger for my three wheel golf cart based vehicle.
Any reason why I couldn't buy the above 72 volt charger and use it along  the 
the 48 volt one I already have?
(48 + 72 = 120 volts).  I could tap into the pack at the appropriate  spot to 
split the charging load.  Could even have more than one tap point  to rotate 
the charging load...
Please reply to me directly as I have POSTPONED the EVDL for a couple weeks  
of travel.
 
[EMAIL PROTECTED] (mailto:[EMAIL PROTECTED]) 
 

Matt  Parkhouse
Colorado Springs, CO
BMW m/c-Golf Cart trike - 48 volts, 30mph  on the flat, 35 mile range
1972 VW Van - Engine/gas tank OUT, work under  way!



**************Start the year off right.  Easy ways to stay in shape.     
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489


------------------------------

Message: 2
Date: Sun, 06 Jan 2008 11:49:54 -0700
From: Jon Glauser <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Balancing A123 cells
To: Electric Vehicle Discussion List <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I'm in the RC group. This is about a charger that has a balancer built 
into it. Most LiPo chargers designed for multi-cell packs have balancing 
built in. See the extra little connector (not the main large connector) 
with multiple wires? That lets the charger balance the pack. They also 
mentioned a product that acts as a low voltage cutoff to prevent over 
discharge. The only significantly different thing about their product is 
that they designed it with "special" A123 algorithms in the charger.

Dan Frederiksen wrote:
> it's for recharging R/C packs. there are various mistakes/typos in the 
> document too. other than talk a lot I'm not sure what good data it 
> contains.
> it's a familiar claim of being able to bring back damaged batteries.
>
> the document doesn't seem to be about balancing though. but about damage 
> from over discharging. and yes I think it's mostly about fooling the R/C 
> people into thinking that it's smart and scientific. 'you need this' 
> 'you are smart if you buy this'
>
> Jeff Shanab wrote:
>   
>> In this pdf, the company purposely charged and discharged a 4 cell pack
>> without balancing to show how cells get damaged.
>> (of course they are trying to sell their charger)
>>
>> http://www.fmadirect.com/support_docs/item_1229.pdf
>>
>> _______________________________________________
>> For subscription options, see
>> http://lists.sjsu.edu/mailman/listinfo/ev
>>
>>   
>>     
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
>   



------------------------------

Message: 3
Date: Sun, 6 Jan 2008 11:22:55 -0800
From: <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Battery Cell Connection
To: "'Electric Vehicle Discussion List'" <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain;       charset="US-ASCII"

There was a discussion not that long ago that thoroughly discouraged the
idea of mechanical pressure alone (like springs and contacts in consumer
electronics) being sufficient to build an EV pack.  However, I think that's
how Tesla's pack works.  I can't imagine that every small AA-ish sized
battery is welded to something in the Tesla.  I guess the flat prismatic
cells would be easier to link up this way.

-----Original Message-----
The cells of the Altairnano cells on Dennis's CEV are mechanically connected

together. Each of the individual cells has an alum tab, about 3" wide (the 
width of the cell) by 1" high (can be seen in photo at 
http://www.teva2.com/BerubeRecord.html).

The engineer said that the packs are sandwiched together and a copper bus 
bar squeezes the neg and pos terminals together to create a module. I would 
think that there is some sort of spacer between the tabs since the cell 
itself is about .250" in thickness, there is probably also some sort of 
conductive paste that is used,  and other proprietary processes, etc.

Is it possible to create a *spacer/connector* that conforms to the neg and 
pos ends of the A123 cells so that the surface area is maximized? The 
*cell - spacer/connector - cell - spacer/connector - cell - etc* can then be

contained in a package to create a module, no strap welding necessary. 
Pressure could keep the module assembled, but not enough to damage the cell 
itself.




------------------------------

Message: 4
Date: Sun, 6 Jan 2008 11:26:11 -0800
From: <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Fwd: Battery prices
To: "'Electric Vehicle Discussion List'" <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain;       charset="US-ASCII"

Someone should tell GM that.  They are being particularly paranoid in their
charge/discharge strategy for the batteries in the Volt, which means they'll
need a larger pack (and thus a higher pricetag) to get to a 40 mile range.

-----Original Message-----
I've been told that a123 cells can be discharged nearly 100% without
problems.




------------------------------

Message: 5
Date: Sun, 6 Jan 2008 11:56:42 -0800 (PST)
From: gottdi <[EMAIL PROTECTED]>
Subject: [EVDL]  Motor Disassembly Question
To: ev@lists.sjsu.edu
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii


I now have my Aircraft Generator Motor apart and I have just removed all the
holding bolts that keep the field windings in place. I thought the assemble
would just drop out but it did not. All the set screws are out and nothing
is holding the windings within the case. Any idea of how to get these out in
one piece? I do not have photos. Even if I had photos it would not really
show much. This motor did sit in moisture for a long time and there is some
damage to the case but it is very very minor and can be fixed pretty easy.
Actually handled that quite well. I only need to now get the windings out of
the motor. The armature is going into the shop to have the bearings removed
next week. A bit more cleaning will be in order and then I can proceed to
paint the motor. Maybe I will find a machine shop that may be able to take a
shallow turn off the outside of the case to make a real nice surface to
paint. We do have some small shops around here. 

Thanks
Pete




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View this message in context: 
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------------------------------

Message: 6
Date: Sun, 6 Jan 2008 11:57:32 -0800 (PST)
From: gottdi <[EMAIL PROTECTED]>
Subject: [EVDL]  Motor Disassembly Question
To: ev@lists.sjsu.edu
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii


I now have my Aircraft Generator Motor apart and I have just removed all the
holding bolts that keep the field windings in place. I thought the assembly
would just drop out but it did not. All the set screws are out and nothing
is holding the windings within the case. Any idea of how to get these out in
one piece? I do not have photos. Even if I had photos it would not really
show much. This motor did sit in moisture for a long time and there is some
damage to the case but it is very very minor and can be fixed pretty easy.
Actually handled that quite well. I only need to now get the windings out of
the motor. The armature is going into the shop to have the bearings removed
next week. A bit more cleaning will be in order and then I can proceed to
paint the motor. Maybe I will find a machine shop that may be able to take a
shallow turn off the outside of the case to make a real nice surface to
paint. We do have some small shops around here. 

Thanks
Pete




-- 
View this message in context: 
http://www.nabble.com/Motor-Disassembly-Question-tp14652874s25542p14652874.html
Sent from the Electric Vehicle Discussion List mailing list archive at 
Nabble.com.



------------------------------

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