[DIY Project] Reverse Protected 18650 Lithium-Ion Charging Unit

ps915

ps915

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Joined
Aug 31, 2017
Messages
5
Hey Guys,

I started to design a simple 4in1 PCB for charging 18650 cells while looking at my actual charging rig attached to some wood!
Some time ago, i teached myself to design PCBs for hobby use. I really love PCB Design and started this little project.
Its a 4x Charger protected with a 3A diode and a 2A glass fuse.

I am using this for this porject:https://blog.seidel-philipp.de/xxl-powerhouse-diy-feldakku-aus-18650-zellen/

DOWNLOAD

Features
  • 4A charging current
  • mounting holes
  • easy soldering
  • "clean" Design
  • reverse polarity protection with fuse and diode
  • easy expandable (just connect them in series)


I used the cheapest components to get the lowest price possible.

Estimated costs per board including hardware:
1x PCB $4.9 (you will get 10 boards[img=16x16]https://static.xx.fbcdn.net/images/emoji.php/v9/fb0/1.5/16/1f609.png[/img])
4x TP4056 $0.74
4x glass fuse $0.11
8x glass fuse holder $0.08
4x diode $0.48
1x 18650 holder $0.90
------------------------------------
calculated price: $2.8 excluding possible shipping

real price: $7.21 and you still have 9 PCBs left to build more charges and hook them up in parallel.


What do you think?
Any ideas, tips or whiches?

These was my first design, but i already changed the cables to connect them in a better way!

Outdated:

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Please be aware
I wont sell or ship anything to you, its a DIY project made for the community!
I will just share the files for the PCB and a list of parts used!
You have to solder andorder the PCB from any manufacturer yourself!
 
Nice!

Tips: You can add positive and negative on the boards so you screw the boards together in the side. Lets say negative in bottom and positive on the top instead of wires. Like you interconnect batteries or other with each other with tabs. Easier and faster to assemble and you dont need the wires.
 
This looks great, I'd be very interested to get more details so I can put some together. I already have a bunch of 4-cell holders and the chargers ready to go but have been too lazy to put them together :) This looks worth waiting for!
 
That's really neat. So basically you insert a battery backwards and it shorts out and blows the fuse, not the TP4056. How simple.

I am going to build one and test it when I get home. Only I am going to add an LED to light and use a self resetting fuse.
 
Holes and then use copper plates or something instead of the wires to keep them connected :)
 
Hello, I would like to know if you could share the file of your design so I can send 20 plates to improve my charging station
 
Hello, I would like to know if you could share the file of your design so I can send 20 plates to improve my charging station
 
Probably JLCPCB, or another low cost manufacturer.

You can get 10 double sided boards from them for about 2.00$.
 
I made my pcbs using EasyEDA.com, and they use JLCPCB to do the printing. I received my boards in about 3 weeks.
The total cost with shipping was about $8 for 10 boards. Though, there are tricks to getting more boards for the same price. It depends on the size of the boards you need done.
 
I found out there's a trick to the PCB ordering. If you put multiple boards on the same print, you can get a lot more boards for the same price. I don't remember the size off the top of my head, but I think it's around 120cm x 120cm. And then you can put V-Groove lines between the boards to be able to snap them apart afterwards. Depending on the size of your pcb, you could get 100 for the same price, or more ;)

I'll be doing this on my next order.
 
JasonMorris said:
what type of diodes are used? Zener diodes?
Click to expand...

I asked if he could provide a detailed parts list on the facebook group, he mentioned he would add it to his blog but so far I haven't seen an update. I'm guessing he's just busy but hopefully we'll see something soon!
 
I would use a 1n4148 which can cop with the current and is absolute standard...
 
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