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| Date: | Mon, 26 Jun 2006 22:07:34 +0200 |
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Many a good advice,. We have done several remarkable designs with
batteries, finding finally that one had to keep battery and PWB apart
(speaking big batteries). Practical reasons.
Douglas Brook wrote this about copper traces:
delta T (C) Trace width (mil) Trace thickness (oz/sqft)
Location Max current (amps)
20 50 1
external 2
20 50 10
" 9
20 500 1
" 14
20 500 10
" 50
20 2000 1
" 48
20 2000 10
" 167
50 50 1
" 4
50 50 10
" 13
50 500 1
" 22
50 500 10
" 77
50 2000 1
" 73
50 2000 10
" 254
I have this copied into a map with 'good rules'. Think he works at some big
battery industry in the US.
It's interesting to see what enormous current capacity copper has, also, how
important it is to keep an eye on the
temperature.
Ingemar Hernefjord
Ericsson Microwave Systems
>
> Happy Monday!
>
>
>
> I have a customer (we are a fabricator) asking the following question;
>
>
>
> "..we are looking at making a board that is intended to be bolted to some
> batteries through 6mm and 8mm nuts and bolts. I was wondering if you have
> any recommendations on what sort of plating should be on the pads these
> nuts
> are going to screw down onto? The batteries are fairly heavy and the
> apparatus may be subject to some vibration and shock. Thanks for your
> insight."
>
>
>
> I am thinking HASL has been used for years in similar applications but
> does
> anyone have any experience or are there any studies on the matter?
>
>
>
> Regards
>
>
>
> John Parsons
>
>
>
>
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Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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the BODY (NOT the subject field): SIGNOFF Technet
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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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