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PICList Thread
'Li-Ion Battery'
1999\01\20@033617 by Zoltan Perhacs

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Hello !

I have a Panasonic CGR-B/202 7.2V 1.25Ah Li-Ion battery, originally built
for
digital cameras. It has the 2 main connectors and has 3 more. In the package
inside there is a little electronics.
Can someone tell me what this electronics do ? Is there any schematics for
it ?

Can anyone tell me informations about the Sony InfoLithium protocol, and
connectors ?

Thanx !

   Zoltan Perhacs

1999\01\20@034452 by Tjaart van der Walt

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Zoltan Perhacs wrote:
>
> Hello !
>
> I have a Panasonic CGR-B/202 7.2V 1.25Ah Li-Ion battery, originally built
> for
> digital cameras. It has the 2 main connectors and has 3 more. In the package
> inside there is a little electronics.
> Can someone tell me what this electronics do ? Is there any schematics for
> it ?

It prevents the battery from blowing up. LiIon batteries are EXTREMELY dangerous.

>
> Can anyone tell me informations about the Sony InfoLithium protocol, and
> connectors ?

It is basically a small memory with the battery type, voltage,
and charging strategy.

Don't try to recharge it until you've made a thorough study
on LiIon batteries. You can hurt yourself.

--
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1999\01\20@042251 by Mark Willis

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Tjaart van der Walt wrote:
> Zoltan Perhacs wrote:
> >
> > Hello !
> >
> > I have a Panasonic CGR-B/202 7.2V 1.25Ah Li-Ion battery, originally built
> > for
> > digital cameras. It has the 2 main connectors and has 3 more. In the package
> > inside there is a little electronics.
> > Can someone tell me what this electronics do ? Is there any schematics for
> > it ?
>
> It prevents the battery from blowing up. LiIon batteries are EXTREMELY dangerous.

 Exactly (If it's like the Sony batteries I have, this is a little "gas
gauge" voltage measuring circuit, as well as a circuit breaker (FET)
circuit that keeps you from blowing the battery up - should you
accidentally (or intentionally) overvoltage, OR undervoltage, OR
overcurrent, these batteries, it open circuits to prevent explosion.

{Quote hidden}

 You can find charging IC's etc. at Benchmarq (for example there's a
supervisor module such as the one you are looking at, at
http://www.benchmarq.com/FCIC.html#bq2058_family.)  Chargers etc. there
as well.

 The raw cells are potentially explosive without such a supervisor
module in series, I have so far just used packaged units though.
Potential for quite a smoke test on these.  You cannot find raw lithium
cells easily at all AFAIK (I've looked!)

 Mark

1999\01\20@044921 by Zoltan Perhacs

picon face
>> I have a Panasonic CGR-B/202 7.2V 1.25Ah Li-Ion battery, originally built
>> for
>> digital cameras. It has the 2 main connectors and has 3 more. In the
package
>> inside there is a little electronics.
>> Can someone tell me what this electronics do ? Is there any schematics
for
>> it ?

>It prevents the battery from blowing up. LiIon batteries are EXTREMELY
dangerous.

{Quote hidden}

Where can i get more informations about the Li-Ion technology (charging,
discharging, etc),
and about the Sony protocol ?

Thanks !

   Zoltan Perhacs

1999\01\20@052656 by Tjaart van der Walt

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face
Zoltan Perhacs wrote:
>
> >>Can anyone tell me informations about the Sony InfoLithium protocol, and
> >> connectors ?
>
> >It is basically a small memory with the battery type, voltage,
> >and charging strategy.
>
> >Don't try to recharge it until you've made a thorough study
> >on LiIon batteries. You can hurt yourself.
>
> Where can i get more informations about the Li-Ion technology (charging,
> discharging, etc),
> and about the Sony protocol ?

http://www.altavista.digital.com

--
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                         \ /
Tjaart van der Walt        X  ASCII RIBBON CAMPAIGN
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|--------------------------------------------------|
|                WASP International                |
|R&D Engineer : GSM peripheral services development|
|--------------------------------------------------|
| Mobile : tjaartspamspam_OUTsms.wasp.co.za  (160 text chars) |
|     http://www.wasp.co.za/~tjaart/index.html     |
|Voice: +27-(0)11-622-8686  Fax: +27-(0)11-622-8973|
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1999\01\20@063216 by Ray Doerr

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   Maxim makes a chip (Part # MAX846A) that can be controlled by a PIC to
charge any type of Battery chemistry including Li-ion, NiMH and NiCad.  I
have just order a sample of this part to play with.  The data sheet can be
found here http://209.1.238.250/arpdf/1471.pdf

Thanks

{Original Message removed}

1999\01\20@065539 by Zoltan Perhacs

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Thank You for the information.
But i think that is possible to build an intelligent charger without specil
IC's.
This is why i'm looking for these informations.

Bye !

   Zoltan Perhacs


>>> I have a Panasonic CGR-B/202 7.2V 1.25Ah Li-Ion battery, originally
built
{Quote hidden}

1999\01\20@094022 by Greg Cormier

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There's some chargers at this site

http://www.linear-tech.com

Nice guys, they'll fax the schematics to you if you want...

-greg


-----------------------
Greg Cormier
Kathmandu, Nepal
Local time : GMT + 5h30m
@spam@gcormierKILLspamspamwlink.com.np
ICQ # : 565465

1999\01\20@120541 by D Sorlien

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The battery you have is most likely built to the Smart Battery System (SBS)
Spec. Read all about it:
http://www.mediacity.com/~sbs/specs.htm

Do not attempt to charge a Li-Ion battery unless you know EXACTLY what you are
doing. Charging one of these the wrong way could cause the battery to explode
with enough force to cause fatal body injury. A properly designed Li-Ion pack
will have double or triple redundant safety circuitry to prevent
overcharge/overdischarge (in addition to any gas gauge circuitry, be it SBS
compatable or otherwise).

You will likely have difficulty finding data for the IC's in the pack. It is
very unlikely that Panasonic would use a Maxim or Benchmarq part in one of their
packs. More likely, the IC's are custom or semicustom designs.

Dave Sorlien

Zoltan Perhacs wrote:

{Quote hidden}

1999\01\21@171929 by Steve Smith

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The five conectors on this type of battery are as follows (I got some duacell
ones 10.8v)

+ Battery +ve
- Battery -ve
T Tempreture
D SDA
C SCL

The interface is i2c and i remember a discussion on the topic in a recent
Elektor mag information is contained in the battery on voltage / charge
current / capacity .....

This dosent all need to be used as they can be constant current charged same
as a nicad but make sure that the current dosent exceed 10% of the capacity eg
10Ah max charge 1A this will give a fully charged battery in about 14 hours.

Cheers Steve.......

1999\01\27@125847 by Cheney, Joseph

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face
Try looking on microchips website - application notes - reference designs -
intelligent battery charger...  Does ni-cad's and ni-mh by default; Li-Ion
would be simple to add once you understand the charging characteristics for
these types of cells.

JC

{Original Message removed}

1999\01\28@075624 by Zoltan Perhacs

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Hello !

>Try looking on microchips website - application notes - reference designs -
>intelligent battery charger...  Does ni-cad's and ni-mh by default; Li-Ion
>would be simple to add once you understand the charging characteristics for
>these types of cells.
This is the information i'm looking for. The charging characteristics for
Li-Ion
batteries.

   Zoltan Perhacs

1999\01\28@132510 by Cheney, Joseph

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Have a look at Benchmarq's website http://www.benchmarq.com - although their
business is selling gas-guage and charging regulator chips there's also
quite a bit about cell charging in general.

If you need some real in-depth info then i guess i can scan in some
documents i have about Li-Ion technology for you. ( i work part-time for a
company that designs and manufactures battery systems for the military so
i've got a whole load of info like this ) In case your interested

Later...
JC

{Original Message removed}

1999\01\29@080011 by Zoltan Perhacs

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>If you need some real in-depth info then i guess i can scan in some
>documents i have about Li-Ion technology for you. ( i work part-time for a
>company that designs and manufactures battery systems for the military so
>i've got a whole load of info like this ) In case your interested

Oh, thank you !
I'm very interested.

   Zoltan Perhacs

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