Author Topic: Coin cell contacts for extension of PCB installation  (Read 682 times)

0 Members and 1 Guest are viewing this topic.

Offline jmajaTopic starter

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: fi
Coin cell contacts for extension of PCB installation
« on: March 30, 2019, 08:11:03 am »
I have tried to find something suitable to install a CR2430 battery at the end of a PCB while keeping the thickness at absolute minimum (the attachment shows where the battery should be). The battery would be replaced by opening the thin end of the enclosure. CR2430 is 30 mm thick and I can fit the PCB into a 3.1x24.5 mm slot. Is it possible to fit the battery + contacts into that slot? Where can I find such contacts? All I can find are ones for on top of a PCB installation or with a way too thick battery holder.

I don't mind making the slot a bit wider, if that would help. Maybe I could put the + contact to the side or to the end of the PCB touching the side of the battery?

The prototype has a battery with solder tabs making it difficult to replace and 3.5 mm thick: https://www.tme.eu/pt/Document/7bb85767ed87a4ab1521fe4f9700c84d/cr2430v.pdf
 

Offline jmajaTopic starter

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: fi
Re: Coin cell contacts for extension of PCB installation
« Reply #1 on: April 02, 2019, 10:40:46 am »
This one should work for the positive side: https://www.digikey.fi/product-detail/en/keystone-electronics/120TR/36-120CT-ND/5872901

But I haven't really figured out how to do the negative side. Is there a  standard for the CR2430 dimensions? Different manufacturers seem to give different diameters for the negative side. Energizer defines the minimum as only 8 mm, but the picture shows much larger diameter: http://data.energizer.com/pdfs/cr2430.pdf

Are there really batteries with say less than 15 mm negative bottom diameter?

Would this work? https://www.digikey.fi/product-detail/en/keystone-electronics/112TR/36-112TR-ND/4499393

It doesn't reach long enough when soldered from the middle, but maybe soldering from the other end. Then it could reach to 6-8 mm from the side of the coin cell thus to 9-13 mm diameter. There is a 0.25 mm dimple on top of 0.15 mm thick material. Will it cause a short cut when the battery slides over it. Will it have a good contact? Is it better to to install the dimple away or towards the battery? Maybe I could put a slot in the enclosure for keeping it further from the positive edge, but that may result to bad contact.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf