Attaching leads to Li-Po cell

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#1
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Here I go again....

 

I am looking at purchasing the following 3.7v cell:

http://www.all-battery.com/Tener...

 

The tabs coming from the cell are Ni (nickle) for the Anode, and Al (aluminum) for the cathode according to the spec sheet on the site.

 

I know I can solder to the Nickle tab if I am careful, but what about the Aluminum tab?  Not sure if I can get regular solder to work with it.

 

Any help I am all open eyes to.

 

And YES, I am looking for cells with integrated protection circuits and leads already installed,but I already have a charging /discharging circuit picked out that will save $$

 

 

Jim

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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There is aluminum solder out there. Our local hardware store has some. But, its pretty high  temperature stuff, as I recall. Don't know how well a battery would stand up when it is used. I have to use a little butane torch powered "iron" to use it.

 

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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A local Battery Giant may have a CD welder that's used for rebuilding customer's cylindrical cell battery packs.

http://www.batterygiant.com/

 

"Dare to be naïve." - Buckminster Fuller

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ka7ehk wrote:

There is aluminum solder out there. Our local hardware store has some. But, its pretty high  temperature stuff, as I recall. Don't know how well a battery would stand up when it is used. I have to use a little butane torch powered "iron" to use it.

 

Jim

Thats my concern as well.  I can get the cells with leads and the accompanying protection PCB, but the cost more than doubles to $25.00 each.  The charging/discharging circuit I have picked from Mchip is only a couple bucks with passives and does everything I need.

 

Back to Google search I go.  I suppose i can simply wait till Monday and call the vendor and ask if they have the cell with leads too....DUH

Thanks Jim

 

gchapman wrote:
A local Battery Giant may have a CD welder

Closest one is two states away so not cost effective.  Thanks for the idea though

 

Jim

 

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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According to this site, you can find solders that work at <700(F), but any process you use requires some attention to detail.  Might not be much fun.

 

https://app.aws.org/wj/2004/02/046/

 

Good Luck,

 

hj

 

 

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The translation of that data sheet to english is so poor that i would not trust the terminology used to describe the type of metal used for the tabs, The case is said to be aluminum but one tab is A1. Notice the #1 in the pdf. An almost identical data sheet from http://www.batteryspace.com/polymer-li-ion-cell-3-7v-3200-mah-605585-2c-655585-2c-11-84wh-6-4a-rate---ul-listed-un38-3-passed-ndgr.aspx shows it to be a nickle tab welded to an extension of the aluminum case.

http://www.batteryspace.com/prod-specs/3178-PL655585-2C.pdf

 

Rick

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Jim, you really should  consider souring from an RC supplier such as HobbyKing. The cells they supply have solved the issues like tab soldering.

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Cliff
I took a quick look and the single cell units are the same no lead devices I posted a link to. The ones with leads start at 7.4v, but I will look in better detail later today

Jim

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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You probably know this but it is "1S" you would be looking for (1 cell in Series - i.e. a single cell at 3.7V)

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How about just  placing a standard 18650 into a carrier?

 

Ross McKenzie ValuSoft Melbourne Australia

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Yeah Cliff i know that much LOL. Thats why i made the comment that my quick peek showed that leaded packs seem to start at 2S

Ross
The 18650 is way to big and bulky. I do not have the room.

Jim

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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Is a AA size acceptable?

Ross McKenzie ValuSoft Melbourne Australia

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ford2go wrote:
... you can find solders that work at <700(F), ...

Might not be much fun.

There's conductive epoxy (silver) but the expense for prototyping may be excessive.

 

"Dare to be naïve." - Buckminster Fuller

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Too big.  These packs are perfect.  I either have to find them with the leads attached(and with the thermistor if possible), or find a way to attach the leads without damaging the cell.  I only need six of them.

 

I will be making some calls in the morning.

 

JIm

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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Jim,  Do you have a Batteries Plus retailer in you area, they can do the welding of leads for you if you do.

 

Jim

 

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I ended up taking Cliffs advice and purchased three of these:

 

https://hobbyking.com/en_us/turn...

 

Not really what I want, and I am not so sure they are going to fit in my enclosure with the 900Mhz Xbee module and PC board, but There is not much else I can do.

 

 

The reason I wanted the bare cell is the charger IC from Mchip offers Lo battery detection to the AVR which I can transmit back to the host along with some other indicators as well.

 

I am still going to call tenergy and see what they say.  I'll keep you updated if anything new comes in.

 

JIm

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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jgmdesign wrote:
And YES, I am looking for cells with integrated protection circuits and leads already installed,

Indeed, the datasheet leaves a bit to be desired.  It does mention "ultrasonic welding" as the preferred (?) connection method.

 

At the end of the datasheet a leaded model is pictured along with the tabs.

 

Plugging the model number from the datasheet into Google led me here

http://www.lipolbattery.com/lith...

...where the pictures at the top showed both tabbed and leaded models.

 

I'll leave it to you to dig through the hundreds of 3.7V choices to find the right package for you. ;)

 

Another leaded Google hit

https://www.multi3dllc.com/produ...

...but less capacity.

 

 

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

Last Edited: Mon. Mar 20, 2017 - 02:09 PM
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Lee,

Yes, I saw the hundreds of choices from that vendor as well.  I believe #440 or something was the one I was looking atThanks.

 

Jim

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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Perhaps you could use an edge connector and forget about the wires all together?