Tuesday, 23 April 2019

soldering - Can batteries be wave soldered?


Common sense says that you don't wave solder batteries, because the wave would short them for seconds. Yet in this appnote I read



Primary lithium cells may be wave soldered as long as the cell temperature does not exceed +85°C. Cells may be placed in a holder or hand soldered after reflow (tabbed cells).




The first sentence seems to suggest that it's OK to wave solder batteries. Do I read this correctly, and doesn't the battery suffer from the shorting?



Answer




Cells may be placed in a holder or hand soldered after reflow (tabbed cells).



This is what I always do, also for wave soldering, though it's expensive; either way you have an extra, manual step: you either need an operator to solder the battery by hand, or you need that operator to insert the battery into the holder (and the holder also costs money).



Primary lithium cells may be wave soldered as long as the cell temperature does not exceed +85°C.



I guess this refers to soldering a battery in a holder, with an insulating tab inserted. This is often done so that the device isn't already in operation when still in the package; it would drain the battery, and possibly start beeping unwanted in the shop. The user has to draw the insulating tab out to operate the device.

With the tab in place there's no risk of shorting, though the wave will heat up the components on the PCB, including the battery.


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