[TechAssist] Re: Welding tabs on batteries
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 27 Aug 2004 22:24:25 -0400
Its done with a small spot welder. Local retailer called Battery Specialists
uses one to make up battery packs to rebuild obsolete battery assemblies. A
spot welder is a little more sophisticated than appears. There are four
adjustments on the welder:
Pressure. The tips are spring loaded against the work and the pressure at
which the current is turned on is adjustable;
Current. Usually transformer tap changing or something like a Variac;
Time. The length of time that the current is allowed to flow;
Hold Time. The length of time that the pressure is held after the current is
turned off.
Spot welding works best on metals with high electrical resistance. The
battery tabs are usually nickel.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "Ohio Consumer Electronics" <samurai@xxxxxxxxxxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Friday, August 27, 2004 2:11 PM
Subject: [TechAssist] Welding tabs on batteries
> Hi folks,
> I just took my ailing laptop battery pack apart to see if I might be able
to
> rebuild it. Looks like it uses standard Li-ion cells and I've found a
> source for the cells. Looks like tin or stainless steel foil strips about
> 1/4" wide welded to the ends of the batteries. Anyone have any idea how
to
> weld the new batteries in?
> It looks like two small spot welds about 1-2mm apart on each tab. I'm
> visualizing two probes about that far apart pressing the tab against the
> battery and passing enough current between them to weld the tab on.
> I'm wondering if one of those old weller soldering guns could be used
if
> I made a set of probes to fit in place of the regular tip...
>
> Joel Jacobs
> Ohio Consumer Electronics
> Pickerington, Ohio
>
>
>
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