How to make lithium ion battery capacity tester
ฝัง
- เผยแพร่เมื่อ 9 มี.ค. 2023
- How to make Battery Capacity tester for 18650 lithium ion cell using ZB2L3 Module | 4k video | HW586
• How to make lithium io...
In this video, I will be showing an upgraded version of the ZB2L3 battery capacity tester. The new version has resolved the heating issue of the load resistor by replacing the dual stock resistors with a single one that can be mounted on a heat sink. This modification has reduced the heat across the load, resulting in an extended life of the module.
The ZB2L3 battery capacity tester comes with two 7.5-ohm value resistors that need to be connected in parallel. By using the resistance parallel formula, we can calculate that the actual load resistance is approximately 3.75 ohms. Based on the ohms law, for a lithium-ion battery with a peak voltage of 4.2 volts, the maximum current on this load will be approximately 1.12 amperes. This means that the power dissipation across this load resistor is nearly 8.4 watts, which is higher than the power rating of the stock resistors.
After searching for a suitable resistor online, I found that the nearest value to 3.75 ohms is a 3.3-ohm resistor, which will draw approximately 1.27 amperes current. The power ratings of this resistor should be above 8.3 watts, so a 25 watts resistor will suffice.
The metallic body of the resistor along with its holes allowed me to mount it on a heat sink for proper heat dissipation. After mounting the new resistor on the heat sink, I soldered a pair of wires across its terminals and attached the lithium-ion cell holder and the new load to the module in order to test its performance. For the test, I used a Murata 18650 cell.
After configuring the module, the test process started without any issue, and during the whole test process, the temperature of the resistor and the heat sink remained lower than the temperature of the previous stock resistors. Therefore, I recommend this modification to those who use this module frequently for testing the capacities of different batteries.
Specifications
Power supply voltage: DC4.5-6V (micro USB interface)
Working current: no more than 70mA
Discharge voltage: 1.00V-15.00V, resolution 0.01V
Termination voltage range: 0.5-11.0V
Support through current: no more than 3.000A, resolution 0.001A
Voltage measurement error: less than 1%+0.02V
Current measurement error: less than 1.2%+-0.002A
Battery capacity range: 9999Ah (1Ah=1000mAh) when the value is large, the decimal point is shifted and switched, when it is lower than 10Ah, it is displayed as X.XXX, when it reaches 10Ah, it is displayed as XX.XX, and so on.
Circuit board size: 50mmX37mm
Finished product size: 50mmX37mmX17mm (length X width X height, including copper foot height)
Board and accessories weight: single board 28g (including copper column), two 5W ceramic resistors 9g, 50W resistors about 27g (including wire)
Also watch my other interesting videos on TH-cam:
1. Lithium ion battery 3S BMS | Battery Management System | BMS 3S 10A | DIY | BMS 3S 12v Charger
• Lithium battery chargi...
2. How to make 0-30v 0-10A variable power supply Adjustable voltage and current | LM317 | DIY Homemade
• Variable power supply ...
3. Exposed: The Fake LM317 Circuit Diagram Scam | How to Build a Reliable Voltage Regulator with LM317
• Beware of Fake Online ...
4. Battery Capacity Tester for all types of Batteries | AliExpress | Bluetooth | unboxing | 4K video
• How to make Lithium io...
5. The Ultimate 18650 Lithium Ion Battery Charger and Capacity Testing Station | TP4056 | ZB2L3 HW-596
• DIY Lithium ion charge...
6. Spot Welding Machine for 18650 lithium ion cell using Cheap Chinese module | DIY | Homemade
• How to make Spot Weldi...
7. 18650 Li-ion Battery Capacity tester for lithium ion batteries using ZB2L3 Module | 4k video | HW586
• How to make lithium io...
8. Spot Welding Machine for 18650 lithium ion cell using 12v Battery Failed | DIY | Homemade
• Spot Welding Machine f...
9. How to make a 20 Amp LM2596 DC-DC Buck Converter | Step down Converter | MOSFET |
• How to make a 20 Amp L...
10. How to make 12v Auto Cut Off Battery Charger | Power Supply | Charge Controller | Boost Converter
• How to make lead acid ... - วิทยาศาสตร์และเทคโนโลยี
hello... thank you very much for sharing this..works fantastic..really a huge difference than the stock resistors..tested at 21700 cells..thanks👍
Great 😃
Very Nice
Thank you
When my resistor was glowing orange, I realized that there was a heat issue... So, I used the NiChrome wire heating element panel from a 220V electric clothes panel and alligator clips to clip into the coil at whatever point I needed for the amperage that I desired... I was testing 12V LiFePo4 batteries and with the ceramic resistors, concentrated heat was being generated, but with the NiChrome wire, the heat is produced over a large enough area that is is no longer a fire hazard...
Thats another super cost saving and superb idea 💡
Thanks for sharing
😻😻😻 ماشاءالله
Hi. How could I connect multiple boards to one power supply without burning them or power supply. I would like to make 13S tester and test 13S powerbank without disconnection all cell conections from series. The input + side is connected to power input + side. negative sides are not connected on board.
Hello, well a 13s battery bank provides 48.1 volts and since the ZB2L3 module can only handle a maximum of 15 volts, so you cannot use this module for testing a 13s pack.
ZB2L3 can handle a maximum of 4s battery pack for testing.
For this purpose, you can use the DL24P battery tester which is a 180w tester with testing range from 2-200 volts.
Here is a link to my video on DL24p module, check it out.
th-cam.com/video/N7jHftrVanw/w-d-xo.htmlsi=4GU2TMuVxGQQ_B3F
@@ERLEngineering thanks. I was thinking about 13 ZB2L3 boards one for each cell bank. But when I tried that with one power supply they burned because there was a short in between power supply. But I just remembered i already have a 16S diy charger with 16 separate 220v to 5V supply so I will just add ZB boards to that system and I will have charger discharger.
Why separate supplies for each module?
I have used a single 220vAC to 5vDC for powering up 9 zb2l3 modules along with 12 charging modules and it worked fine.
But did you charge single separated cells or cells connected in series. When I tried cells in series my boards got fried when thehy shared power supply.
I checked them each separately because the module itself does not support more than a 4s battery pack.
Since you applied 48.1 volts using a 13s battery pack, it was surely a bad idea.
I have 2 resistors, both are 10W and 4,7 ohm but don't have tolerance value (J). Can I combine it and also can I install it to the module?
Yes you can, If you are joining them in parallel then due to high resistance, you will observe a low current drop and longer time for each battery to discharge.
@@ERLEngineering One more question. besides discharging speed, Is there any different in capacity results between the resistor you have right now (25W 3,3RJ) and the current one (2 resistors 5W 7, 5RJ)?
No, this only changes the discharge speed.
@@ERLEngineering Thanks a lot for the information.
Welcome 🤗
what product name and type (orange diot)?
Its not a diode, its a 25 watts resistor. You can find it easily on aliexpress from where i bought it
@@ERLEngineering yes its resistor and thank you for helping me
Welcome
1.12^2 x 3.75 = 8.4 ???
Good check, sorry i think i made a mistake during the calculation, it should be 4.7W, but still this video is good right in terms of replacing the stock resistor with a heatsink mount one 😃
@ERLEngineering if I replace the original resistors with 25W 2.5om one, will it be a good idea if I only want to test 18650 cells?
With a 25W 2.5 ohm resistor, the current drop across the resistor would be 3.16 amps at peak voltage of 4.2v.
I would recommend to use heatsink with the resistor to help it dissipate heat.
This would work good for 18650 cells.