| Electronics > Projects, Designs, and Technical Stuff |
| How to measure amps and heat for 18650 cells? |
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| spinningmagnets:
Hello, I am a writer for electricbike.com, and I have been waiting for someone to perform a series of tests on 18650 cells, so I could publish the results. I've promised compensation to several candidates who had already posted about testing cells, so they already had most of the required set-ups. And yet, they are very busy, just as I am. I now find myself with some time on my hands, and money in my pocket. There are several often-quoted sources for the continuous and max output results of testing 18650 cells (perhaps ten different popular models). Rather than tell customers to trust that number, I'd rather post the temperature results at a dozen amp-draw levels, and then let the customer decide what the "true" amp-drain limits are. I have a certain familiarity with electrical terms and components, but I am weak on electronics. Plus, when I search Google I get 1,000 results. I believe I need two devices: 1. A variable current-load for a single 4.1V cell with digital readout, perhap 1A-40A? Some way to data-log... 2. A surface mount temperature probe to be clamped to the side of an 18650 cell, with data-logging 3. Some way to capture and overlay the two data lines, so I can make those cool graphs we are all familiar with. Any advice is appreciated. I have a soldering iron, and I'm not afraid to use it... |
| metrologist:
I like data https://lygte-info.dk/review/batteries2012/Common18650Summary%20UK.html here is a small set http://danyk.cz/test18650_en.html If I were to DIY, I would use current shunt and an NTC or temp sensor plugged into an Arduino to read the sensors, then Arduino writes to SD card or over serial to PC with a serial monitor logging program like PuTTy. |
| spinningmagnets:
Thank you, I appreciate you taking the time to reply. I will look into this suggestion. |
| metrologist:
I suggest this because I built that solution to monitor my solar panel production. There are hall effect current sensing modules and I used a simple divider to bring the 24V+ down to the 5V range. I planned to apply the solution to the same thing you want here. You may even have enough ADC pins to monitor each cell. |
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