Battery Soldering?

14 replies [Last post]
Offline
Joined: Jul 31 2005
Posts: 6

Hello. I'm trying to re-manufacture a lithium-ion battery, and I was wondering if some one could tell me what the combustion point of those batteries are. Also, any tips you can give me about soldering these contacts points would be greatly appreciated.

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
Offline
Joined: Jan 20 2005
Posts: 700
i would recomend only holding

i would recomend only holding the iron on the battery just long enough to get the solder on there. some lithium batteries ive seen can handle internal temps of around 200 deg f. as long as you dont hold the iron on there too long you should be fine, heck they have solder on them already right? even if they dont, battery packs are soldered together all the time. any other experts out there wanna chime in on this??

__________________

-Justin
(dead) PB100, Q650, PB Wallstreet, beige G3, Imac snow 600, Ibook g4, SE30, (dead) IIsi, TiBook 667VGA, PBg4 1.5, MDD dual 1.25ghz, 1.8ghz g5 tower.
OS7.5 to 10.3.9. I LOVE CLASSIC MACS!

Jon's picture
Jon
Offline
Joined: Dec 20 2003
Posts: 2804
Commonly the cells are welded

Commonly the cells are welded, not soldered. If you want a decent job ou might look into having alocal battery shop do the welding for you once you get everything else hooked up and in place. It shouldn't cost too much for a dozen or two spot welds, but I've never actually gone out and priced it.

__________________

I am not in this world to live up to other people's expectations, nor do I feel that the world must live up to mine. - Fritz Perls

Offline
Joined: Dec 20 2003
Posts: 354
Have you already bought the b

Have you already bought the batteries? The easiest thing to do is buy them with welded tabs already attached, which only costs an insignificant amount more (25 cents). Then soldering will be much, much easier.

__________________

"One day I shot an elephant in my pajamas. What he was doing in my pajamas I have no idea."

dankephoto's picture
Offline
Joined: Dec 20 2003
Posts: 1900
low temp solder?

Something like silver solder, ought to make it a bit easier anyhow if you can't get anyone to do 'real' welding.

dan k

__________________

|| web page gone - curse you Comcast! | Applish goodies servers offline, sorry! |
» email macdan at comcast.net

Offline
Joined: Jul 31 2005
Posts: 6
I wish I could have some one

I wish I could have some one do it for me locally, but I there isn't anyone around here that does that sort of work.

No, I haven't purchased new batteries yet. I only just discarded an idea a friend of mine had for jury-rigging the battery pack. I'll try to find some with the tabs like you mentioned. Does anyone have a particular internet retailer that they prefer for this sort of thing?

BTW, thanks for all the great info so far. It is greatly appreciated.

Offline
Joined: Jan 28 2004
Posts: 40
Just make sure you use flux..

Just make sure you use flux.. and it should work no problems.. I have done it befor to fix cordless phones..

DrBunsen's picture
Offline
Joined: Dec 20 2003
Posts: 946
DIY spot weld

Saw instructions somewhere online for building your own small spot welder for battery tabs - stuffed if I can find it now. Try hackaday searching these forums. Looked pretty cheap, safe and easy from memory.

__________________

Damn the Torx screws, full speed ahead!
Apple and Wireless FAQ

Jon's picture
Jon
Offline
Joined: Dec 20 2003
Posts: 2804
MAKE!
__________________

I am not in this world to live up to other people's expectations, nor do I feel that the world must live up to mine. - Fritz Perls

Jon's picture
Jon
Offline
Joined: Dec 20 2003
Posts: 2804
Even cheaper method: mod a so

Even cheaper method: mod a soldering gun!

Quote:

Of course! A soldering gun is a source of about 1.5 V at 100 A RMS. Should make a fine spot-welder.

From http://repairfaq.ece.drexel.edu/sam/aapsfaq.htm#adpssol

__________________

I am not in this world to live up to other people's expectations, nor do I feel that the world must live up to mine. - Fritz Perls

dankephoto's picture
Offline
Joined: Dec 20 2003
Posts: 1900
re: mod a soldering gun!

Hot damn! I gotta try that! OK . . . I'll make a lil' ground clip thingy to attach to one 'trode and have a contact tip on the other. Cool!

dan k

__________________

|| web page gone - curse you Comcast! | Applish goodies servers offline, sorry! |
» email macdan at comcast.net

Ex-parrot's picture
Offline
Joined: Dec 20 2003
Posts: 6835
Just to add my NZ $0.02 (rapi

Just to add my NZ $0.02 (rapidly losing value Sad), I re-wound a microwave oven transformer to try and use it as a spot welder and never really had much success. The metals would get very hot but never actually weld like the real thing. Not sure why, it might not have been supplying enough current I suppose. (It did peg my AC clamp meter and bend the needle though...)

__________________

Michael

DrBunsen's picture
Offline
Joined: Dec 20 2003
Posts: 946

Neither of the two above are the ones I was thinking of - I seem to recall they used a high-current lab bench power supply. But they both look good - well found.

__________________

Damn the Torx screws, full speed ahead!
Apple and Wireless FAQ

Offline
Joined: Aug 1 2006
Posts: 1
POOR MAN'S BATTERY TAB WELDER

If you would like to follow this link it will take you to what you are looking for.

http://www.philpem.me.uk/welder/

Good luck & let me know how you get on with it.

Cheers
Brian

DrBunsen's picture
Offline
Joined: Dec 20 2003
Posts: 946
That's the one!

That's the one!

__________________

Damn the Torx screws, full speed ahead!
Apple and Wireless FAQ