other:soldering
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other:soldering [2019/09/09 09:49] f4ija created |
other:soldering [2019/09/09 20:54] (current) f4ija |
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| ====== DIY point soldering unit ====== | ====== DIY point soldering unit ====== | ||
| ===== Introduction ===== | ===== Introduction ===== | ||
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| To make good battery packs made of 18650 cells, it's not a good idea to solder them with tin because you're going to heat up a lot the chemical components of the battery and this can reduce the battery life. | To make good battery packs made of 18650 cells, it's not a good idea to solder them with tin because you're going to heat up a lot the chemical components of the battery and this can reduce the battery life. | ||
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| ===== Global instructions ===== | ===== Global instructions ===== | ||
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| + | {{ :other:img_20190909_175023.jpg?600 |}} | ||
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| I don't have photos of the build, sorry about that but here are the global steps to make your solder unit : | I don't have photos of the build, sorry about that but here are the global steps to make your solder unit : | ||
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| Machine the copper barrel to be able to screw it to the 2 thick wires and make a point on one side of each (it will be the contact tips for soldering). | Machine the copper barrel to be able to screw it to the 2 thick wires and make a point on one side of each (it will be the contact tips for soldering). | ||
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| + | {{ :other:img_20190909_175055.jpg?600 |}} | ||
| Make a box, and an articulated arm for the tips. I've made a 3D printed part to have the tips with the right gap (about 4-5mm). | Make a box, and an articulated arm for the tips. I've made a 3D printed part to have the tips with the right gap (about 4-5mm). | ||
| - | The Arduino will be used, with a homemade program, to have precise pulses of high current when clicking on the microswitch, to make a solder spot. This will permit good repeatability of the process and will avoid sticking and destroying the cells. | + | {{ :ebike:img_20171013_205206.jpg?600 |}} |
| + | {{ :ebike:img_20171013_211552.jpg?600 |}} | ||
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| + | The Arduino will be used, with a homemade program, to have precise pulses of high current when clicking on the microswitch, to make a solder spot. This will permit good repeatability of the process and will avoid sticking and destroying the cells. | ||
| Voilà, your soldering unit is almost finished ! You need to flash the Arduino firmware with the code below and you're good to go ! | Voilà, your soldering unit is almost finished ! You need to flash the Arduino firmware with the code below and you're good to go ! | ||
| ===== Arduino sketch ===== | ===== Arduino sketch ===== | ||
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| + | It's very simple. When you click on the microswitch, the Arduino will detect it and then launch a soldering sequence (buy activating the relay) for the time given in parameter. | ||
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| + | You can launch a cycle every 500ms to prevent sticking. | ||
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| <code> | <code> | ||
| int buttonState = 0; | int buttonState = 0; | ||
| const int buttonPin = 12; // the number of the pushbutton pin | const int buttonPin = 12; // the number of the pushbutton pin | ||
| const int relaisPin = 3; // the number of the relay pin | const int relaisPin = 3; // the number of the relay pin | ||
| - | int temps = 55; //le temps de la soudure 75 | + | int temps = 55; //le temps de la soudure 55ms |
| - | int attente = 500; //temps d'attente entre chaque possible soudure | + | int attente = 500; //temps d'attente entre chaque possible soudure en ms |
| void setup() { | void setup() { | ||
| Line 83: | Line 97: | ||
| </code> | </code> | ||
| + | ===== Results ===== | ||
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| + | The points are quite good. It take a little time to get used to it. Also, it's important to have the tips well in contact with the nickel strips. However, you'll make some arcs and that can damage the battery cell (I've made holes in 2 or 3 cells this way ; cells are after that leaking some juice and are unusable...). | ||
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| + | Also, the tips are getting hop during the process so during long soldering periods, I need to cool them down by putting them in a glass of water. | ||
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| + | Anyway, for very low price, it's a good project, and useful as you can use 18650 cells in lot of project. | ||
other/soldering.1568015346.txt.gz · Last modified: 2019/09/09 09:49 by f4ija
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