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mowhoong

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Jan 29, 2012, 11:12:14 AM1/29/12
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When I dismantled the battery pad, I noticed there were spot welded on
to the nickel plate on the battery terminal. This nickel plate is used
to connect the batteries in series or parallel.
I do not understand why copper wire was not use instead ,as copper
wires are commonly use in electronic circuits. Is there any reason ?
Appreciate your explanation.
Regards

Randy Day

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Jan 29, 2012, 1:27:08 PM1/29/12
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In article <0070a1f6-8f2a-49f0-be76-
4bcb85...@b10g2000pbd.googlegroups.com>, mowh...@hotmail.com says...

[snip]

> I do not understand why copper wire was not use instead ,as copper
> wires are commonly use in electronic circuits. Is there any reason ?
> Appreciate your explanation.
> Regards

Mechanical stiffness, perhaps, or maybe
nickel-plated is cheaper than copper as
a commodity right now?

John Larkin

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Jan 29, 2012, 2:28:49 PM1/29/12
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The nickel spot welds better.


--

John Larkin, President Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators

Jamie

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Jan 29, 2012, 2:38:12 PM1/29/12
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galvanic electrolysis?

Jamie



k...@att.bizzzzzzzzzzzz

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Jan 29, 2012, 6:29:26 PM1/29/12
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On Sun, 29 Jan 2012 11:28:49 -0800, John Larkin
<jjla...@highNOTlandTHIStechnologyPART.com> wrote:

>On Sun, 29 Jan 2012 08:12:14 -0800 (PST), mowhoong
><mowh...@hotmail.com> wrote:
>
>>When I dismantled the battery pad, I noticed there were spot welded on
>>to the nickel plate on the battery terminal. This nickel plate is used
>>to connect the batteries in series or parallel.
>>I do not understand why copper wire was not use instead ,as copper
>>wires are commonly use in electronic circuits. Is there any reason ?
>>Appreciate your explanation.
>>Regards
>
>The nickel spot welds better.

...and doesn't corrode as badly.

Peter Bennett

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Jan 29, 2012, 7:47:44 PM1/29/12
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... and the resistance of the short bit of nickel is insignificant.


--
Peter Bennett, VE7CEI
peterbb (at) telus.net
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

Phil Allison

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Jan 29, 2012, 7:57:21 PM1/29/12
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"Peter Bennett"

>>>
>>>The nickel spot welds better.
>>
>>...and doesn't corrode as badly.
>
> ... and the resistance of the short bit of nickel is insignificant.
>


** The resistance is what makes it spot weld nicely - but it is not
entirely insignificant, if the pack is used at a high enough discharge rate.

Spot welds in thin steel tend to vary in quality and some have high enough
resistance to cause voltage drop and localised heating of a pack of NiCd or
NiMH cells.

RC plane, car and boat enthusiasts tend to avoid them and prefer soldered,
thick copper wire links between cells.


.... Phil




George Herold

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Jan 30, 2012, 11:03:49 PM1/30/12
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On Jan 29, 6:29 pm, "k...@att.bizzzzzzzzzzzz"
<k...@att.bizzzzzzzzzzzz> wrote:
> On Sun, 29 Jan 2012 11:28:49 -0800, John Larkin
>
Spot welding copper is a PITA...
(having made many type T? copper constantan TC's
with and without spot welder.)

George H.
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