Multiple versions of DW01 lithium battery protection board

introduce

• Using DW01 series (DW01A DW01V, etc.) chips, small size and powerful functions
• External 8205MOS, up to 4 MOS depending on the version
• Compatible with various sizes of lithium batteries, including 18650 and others
• The test uses Fumon DW01V (C12864) and Fumon SC8205A (C83931). The datasheet has been uploaded to the engineering attachment.
• There are three sizes in total

1. 35x7.9mm rectangular 4MOS (actual object has been made) How many MOS are actually needed can be welded as needed
2. 30x4.2mm rectangular 1MOS is more slender and suitable for small-sized batteries
3. 17.5mm diameter round 1MOS suitable for bottom installation of 18650 battery

Physical map

test

Use an adjustable power supply to supply 3.7V at B+/B-, the MOS is turned on, and there is a 3.7V voltage at P+/P-

Adjust the voltage to below 2.5V, the MOS tube will not conduct, and it will protect the battery when the voltage is low.

When the voltage is adjusted to above 2.9V, the MOS tube turns on again, which is equivalent to charging the battery to 2.9V and then turning on the output again.

Use tweezers to short-circuit the output terminal, and the output will be cut off immediately. Equivalent to turning off the output when the positive and negative poles of the battery are short-circuited.

Observing the current curve of the adjustable power supply (blue line, one grid is 1.184A), you can find that the current only rises for a moment, and then the output returns to normal because the protection board is closed.

Remove the short circuit, the MOS tube resumes conduction, and returns to normal state.

postscript

Due to limited conditions (and laziness), I did not conduct a more detailed test on the protection function of DW01. According to the official Datasheet, the chip also has over-voltage/current discharge protection, over-voltage charging protection and other functions. Please refer to the data sheet for specific information, which I will upload to the engineering attachment. If you have any questions, you can ask me in the comment area below or send me a private message. If you think this project is good or helpful to you, please give me a thumbs up and a little star below, thank you.