[EVDL] Li-Ion Battery equalizer/balancer free circuit - DIY Electric Car Forums
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  #1  
Old 09-09-2009, 01:15 PM
EVDL List EVDL List is offline
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Default [EVDL] Li-Ion Battery equalizer/balancer free circuit

Hi Folk's

[top]


As necessity is the mother of invention I made some battery equalizers for


my Li-ion T-sky batteries using a simple PWM (1kHz) feedback technique to m=
odulate the power shunt resistor so the darlington transistor doesn't fry (=
like on other storebought versions). (Sent in circuit to post on EVDL) It'=
s designed for a 2A max shunt current and am using on T-Sky yellow batts se=
t to 3.8V. The charger is a standard dv/dt=3D0 charger so it shuts off whe=
n the voltage stops rising for an hour. I took a turn off the secondary to=
reduce the taper current to 1A which keeps the balancers from getting too =
hot. I also found that when discharging they stay fairly close in voltage =
since they were equalized on charge (solar boat 16 cells 52.8V at 3.3V per =
cell) final charge is 3.8 x 16 =3D 60.8V

[top]


Also on my www.evdl.org/lib/mh circuits is the battery scanner I use as wel


l to see each cell voltage AND the "DC Watt Hour" which is actually listed =
under the renewable energy products so I can see how empty/full my 11kWh pa=
ck is (the Curtis 900R guage always says "full" since the cells stay at 3.3=
V until the very end).

[top]


Remember to conformal coat your equalizers and gliptol (red finger nail pol


ish) the multiturn 10k pot. I emailed Dave the equalizer circuit so should=
be posted soon.

[top]


BTW, I'm amazed that the Li-Ion battery manufacturers don't show a recomend


ed balancing circuit on their websites since they require balancing. Most =
companies i'm used to in electronics do for things that are required to mak=
e their product last.

[top]


This month's issue of Circuit Cellar (Sept 09) showed a Ryobi drill with no


balancing that crapped out fairly new and an LT6802 chip to balance the ba=
tteries (Linear Tech), also has a nice PC display on the eval board.

[top]


have a renewable energy day,

Mark in Roanoke, VA

www.solectrol.com solar-wind home

www.evalbum.com/1273 & solar boat

__________________________________________________ _______________
Windows Live: Make it easier for your friends to see what you


92re up to on=
Facebook.
http://windowslive.com/Campaign/SocialNetworking?ocid=3DPID23285::T:WLMTAGL=
:ON:WL:en-US:SI_SB_facebook:082009
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  #2  
Old 09-10-2009, 08:58 PM
EVDL List EVDL List is offline
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Default Re: [EVDL] Li-Ion Battery equalizer/balancer free circuit

Now posted in the EVDL library - http://evdl.org/lib/

It's under battery managers.

David Roden - Akron, Ohio, USA
EVDL Administrator

[top]


= = = = = = = = = = = = = = = = = = = = = = = = = = =
EVDL Information: http://www.evdl.org/help/

[top]


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reach me. To send a private message, please obtain my
email address from the webpage http://www.evdl.org/help/ .

[top]


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  #3  
Old 09-11-2009, 07:15 AM
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Default Re: [EVDL] Li-Ion Battery equalizer/balancer free circuit

Ah, thanks. Excellent repository - I didn't know about it!

How do we submit items to post? I'd like to put up my AXEMON, Alltrax
monitor for the Palm (and hopefully a few more items in the future).

- SteveS

[quote]EVDL Administrator wrote:
> Now posted in the EVDL library - http://evdl.org/lib/
>
> It's under battery managers.
>
> David Roden - Akron, Ohio, USA
> EVDL Administrator
>
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> EVDL Information: http://www.evdl.org/help/
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> Note: mail sent to "evpost" an "etpost" addresses will not
> reach me. To send a private message, please obtain my
> email address from the webpage http://www.evdl.org/help/ .
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
>
>
> _______________________________________________
> General EVDL support: http://evdl.org/help/
> Usage guidelines: http://evdl.org/help/index.html#conv
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  #4  
Old 09-11-2009, 12:15 PM
EVDL List EVDL List is offline
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Default Re: [EVDL] Li-Ion Battery equalizer/balancer free circuit

[quote]On 11 Sep 2009 at 9:02, SteveS wrote:

> How do we submit items to post [in the EVDL library]?

Just email contributions to my offlist address as an attachment. (Don't use
the reply address on this message as your mail will fall into the bit
bucket.)

My offlist address is at the bottom of the EVDL help page :

http://evdl.org/help/

David Roden - Akron, Ohio, USA
EVDL Administrator

[top]


= = = = = = = = = = = = = = = = = = = = = = = = = = =
EVDL Information: http://www.evdl.org/help/

[top]


= = = = = = = = = = = = = = = = = = = = = = = = = = =
Note: mail sent to "evpost" an "etpost" addresses will not
reach me. To send a private message, please obtain my
email address from the webpage http://www.evdl.org/help/ .

[top]


= = = = = = = = = = = = = = = = = = = = = = = = = = =


_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
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Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
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