Help rebuilding a battery

[Patnukem]

I was thinking about rebuilding a wallstreet battery, I was wondering if it would be ok to use ELECTRICALLY CONDUCTIVE ADHESIVE SOLDER as apposed to hot solder that may lead to battery complications. I have never used it and just wanted to know what people here would think?

 

[tomlee59]

All of the conductive room-temp "solders" I have seen are not very conductive, and/or have poor mechanical properties. What particular product are you thinking of using?

My bias is to build yourself a simple spot-welder if you are unable to find cells with tabs already connected.

 

[Patnukem]

I found some nice sony brand ones that are new and slightly higher Ah and are new. I just am a bit nervous about soldering lithium-ion batteries. I had no idea about any of the brands of conductive adhesives, I have never used them I just wanted to think of a simple safe way to rebuild it. I may also see if they can ad tabs for me, I know they just took them off since they were built for an order and it was canceled. luckily they are the same size 17670.

 

[tomlee59]

You are right to be nervous about soldering directly to Li ion cells. Very bad (i.e., Ghostbusters-bad) things can happen. If the cells don't have tabs already spot-welded to them, you can add some yourself. Rigging up a kludgy spot-welder for this purpose is not hard (main ingredients: power supply, and BFCs -- big, fat capacitors). If you decide to go this route, post back. I can provide you with more detailed instructions on how to construct one (and how to practice non-destructively before you work on the actual cells).

 

[Patnukem]

I can imagine it would be bad, about as nerve racking as the first time you discharge a crt. I am going to hope they will put tabs on them they will be about $1 per cell and they have big lot with 36 so I could make 3 wallstreet batteries. I will post back if they wont do tabs for me and I decide to put some on my self.

 

[Patnukem]

well they told me they would put tabs on them for $0.10 each so for 36 cells it would be 43.20 plus shipping. I could rebuild 3 batteries. they did ask how I would like the tabs. would not know what to ask for, could they possibly pre attach them in 3's like in the battery. I know very little about batteries. here is a picture of my wallstreet battery guts

 

[tomlee59]

It's great that they will put tabs on them for so little. You might actually be able to get them to do a little more and actually configure the whole pack the way you'd like it. I would send them the same pics you posted (maybe with an accompanying wiring diagram, just for insurance) and ask if they could simply do that.

 

[Sludgedragon]

Question:

I found some nice sony brand ones that are new and slightly higher Ah and are new. I just am a bit nervous about soldering lithium-ion batteries. I had no idea about any of the brands of conductive adhesives, I have never used them I just wanted to think of a simple safe way to rebuild it. I may also see if they can ad tabs for me, I know they just took them off since they were built for an order and it was canceled. luckily they are the same size 17670.

Who are "they" and where can I find them??

 

[Patnukem]

well there is only enough for 1 battery left on ebay. Im waiting to hear back from them, If they have more I will try to get extras if you would like. I have never had a chance to re cell a battery and would like to.

 

[register]

The best electrical conductive glue I have tested so far is 2-component silver filled epoxy resin from manufacturer Panacol. It is pretty expensive but allows for repair work otherwise impossible (as for parts that must not be soldered or welded but need a reliable conductive bond). The product Elecolit 325 can be used like a common 2K-Resin curing at room temperature with enough time of 2 hours to apply the sticky mixture. The electrical properties as well as mechanical strength are impressive. See data sheet on:

http://www.panacol.com/images/pdf/el325_gb.pdf

The company supplies samples upon request, but they will charge around USD 50 for handling and shipping a sample of 10 Grams.