Soldering 18650 Batteries (DO IT RIGHT)
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- Опубликовано: 8 фев 2025
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Maybe it’s because I’m getting older, but I really prefer this type of teaching style. He’s not worried about my feelings - just straight to the point and he almost sounds annoyed that he has to show me such a simple thing haha.
So, you can do it that way, hower that is not the best approach.
First of all, if you need to do a battery pack from 18650 cells, the preferred and best method is by spot welding them toghether, with Nickel strips - that is the safest method.
Second, if you must solder them, because you do not have a spot welder, you have to take this in account.
A. Prepare the cells by scuffing the surface of the negative and positive poles wits SANDPAPER (not an electric grinder because you risk ruining the plastic casing). Then clean with alcohol in order to ensure the best surface for the welding material. Final stage for preparation is to stick the cells together in the proper order (positive to negative and so on...) and glue them together with super glue, tape or even double stick tape so that you have a solid pack to work with.
B. Nickel strips are preferred even if you solder the cells, so prepare nickel strips that you need and also scuff them a little with sandpaper and clean with alcohol. The wire you use here may be ok for your application, however, for a battewry pack used on a drill for example (discharge currents of over 20A) that will be a fire hazard.
C. Apply solder paste on the terminals and on the nickel strips.
D. Heat on the iron should be between 430 - 450 Celsius ( 800 - 840 Fahrenheit) in order to be able to solder very fast and as cool as possible. In a good weld both elements should heat up in order for the solder to make a good connection.
C. Apply solder to the battery terminals and then solder the nickel strips in position, taking care to move very fast. If the cells experience a litthe heat for a very short period of time there is no problem, they are capable of that. Do not heat them too much or too long, but a little heat is fine. PLEASE BE CAREFULLL - do not solder the wrong terminals because a short circuit is a fire hazard!!!
D. After soldering all the strips, check again that you soldered all ok and in the correct sequence and apply more isolation if necessary so that your battery terminals do not contact elements of the casing or other electronic components.
Cheers!
Very good and to the point... no wasted time and talk, just a plain and helpful tip on how to get it done... Bravo!
I would only add that you want to do this with a rather hot soldering iron - temperature set somewhere between 400 - 450 C. Very hot and very fast with lots of flux is the key here. Keep the heat only in the area being soldered and don't give it time to spread.
What else can one use in place of the soldering paste? like another alternative to soldering paste?
Hi, great vid, thanks. Could we get the reference of the solder wire and paste you're using and maybe the temperature for the iron?
didn't hear u say it as i sped the video up, but what iron wattage are u using?
Do it outside in case of battery failure. Just to add extra security with working with 18650 and just in case- I would charge it first time outside after soldering.
Holy crap I rarely use this Solder paste bc I didn't know how to use it correctly!! Wow awesomeness
is the wire you're using speaker wire? if not, what kind of wire do you prefer? thanks!
Thanks for the video. From Cyprus
I am trying to make a 3x3 18650 laptop battery. Should I use wires like you use to connect these, or metallic plates? Your method is good in the sense that there is less risk of causing a short circuit since I have read the that the negative terminal is close to the positive one.
I think the metallic and my method is great for me .
Is on you what you want or what is more suitable for your project:)
..."negative terminal is close to the positive one" What do you mean?
@@jamalasa9007 the entire case of the battery is the negative, and it stretches all the way up to the top of the cell.
Thanks for sharing this. I've just successfully re-celled a failing Wickes impact driver battery after watching this. It was originally allegedly 1.3ah(!) - I've made it 3ah using Samsung 30Q cells.
Great video.
Thanks for the help mate 😉
Happy to help
How many wats has your welder? 40, 60, 100?
60
@@TechGuruAndrew Thank you👍
you welcome
Hello, so to make the two batteries work together we just solder a wire connecting the positives and the negatives connected to the negatives? Jut making sure before I attempt that it’s positive to positive and negative to negative. Is this called in parallel? Thanks for you time
how many volts you want?
TechGuru Andrew honestly I’m not sure, just making sure it’s the right way to wire them to use them as one battery
it depends what you want to do.
TechGuru Andrew I’m going to wire to a solar cell and make a solar charger
great vid thank you very much im trying to make a battery pack
Am I the only one who wanted to jump through the screen and wipe that bit of flux off of the table?
And it takes me an hour to do that
@