TP4056 for cell processing

C

CBlack

Member
Joined
May 14, 2018
Messages
59
Hello,

I did a search for TP4056 and it got a crazy amount of searches... \o/

For the TP4056 1A, can i wire it so that all of my positive sides are 1 to 1 and the negative sides are using a common bus?

Also, what is the max that someone has used the tp4056 for charging a cell pack?

Thanks for the info and looking
CB
 
If all your cells are not connected together (in series), then yes.

You can connect all Pos points together for 1 rail, and then all Neg points for the 2nd rail.

If you have more than 10 on a single rail, it would be recommended to run a return wire back to the first one to make a loop. Sometimes there's enough voltage drop that makes the TP's start acting funny.

And yeah, there's a lot of use of the TP here :p


(especially for some of BS that shows up :p )
 
Korishan said:
If all your cells are not connected together (in series), then yes.

You can connect all Pos points together for 1 rail, and then all Neg points for the 2nd rail.

If you have more than 10 on a single rail, it would be recommended to run a return wire back to the first one to make a loop. Sometimes there's enough voltage drop that makes the TP's start acting funny.

And yeah, there's a lot of use of the TP here :p


(especially for some of BS that shows up :p )
Click to expand...

since my fake imax b6 will not charge up to 4.2. I was going to make them do the 4.1 for a group and then use my tp4056 for the 4.1 to 4.2 charge and process them that way to check for capacity after that. I thought it would be better if i did the charging first and then let them set to see if they self discharge to much before putting them on the cap tester. I only have 1 of them right now so back log.

Side note, what is considered to much of a discharge rate?
 
CBlack said:
Korishan said:
If all your cells are not connected together (in series), then yes.

You can connect all Pos points together for 1 rail, and then all Neg points for the 2nd rail.

If you have more than 10 on a single rail, it would be recommended to run a return wire back to the first one to make a loop. Sometimes there's enough voltage drop that makes the TP's start acting funny.

And yeah, there's a lot of use of the TP here :p


(especially for some of BS that shows up :p )
Click to expand...

since my fake imax b6 will not charge up to 4.2. I was going to make them do the 4.1 for a group and then use my tp4056 for the 4.1 to 4.2 charge and process them that way to check for capacity after that. I thought it would be better if i did the charging first and then let them set to see if they self discharge to much before putting them on the cap tester. I only have 1 of them right now so back log.

Side note, what is considered to much of a discharge rate?
Click to expand...

The imax clone should charge to 4.2v. Just set it on the LiPo program.
 
Geek said:
CBlack said:
Korishan said:
If all your cells are not connected together (in series), then yes.

You can connect all Pos points together for 1 rail, and then all Neg points for the 2nd rail.

If you have more than 10 on a single rail, it would be recommended to run a return wire back to the first one to make a loop. Sometimes there's enough voltage drop that makes the TP's start acting funny.

And yeah, there's a lot of use of the TP here :p


(especially for some of BS that shows up :p )
Click to expand...

since my fake imax b6 will not charge up to 4.2. I was going to make them do the 4.1 for a group and then use my tp4056 for the 4.1 to 4.2 charge and process them that way to check for capacity after that. I thought it would be better if i did the charging first and then let them set to see if they self discharge to much before putting them on the cap tester. I only have 1 of them right now so back log.

Side note, what is considered to much of a discharge rate?
Click to expand...

The imax clone should charge to 4.2v. Just set it on the LiPo program.


should be the key term. ion is 4.0 and po is 4.1. I did the ncmd and it went to 4.3. if I am messing up something, please point me in the correct direction. i have 5 of them and really do want to use them but they are not working like they should or I think.
Click to expand...
 
Open the unit and see if there is a pot that can adjust the cutoff voltage. Does the imax show 4.1 or 4.2 on the display? It would be better to charge using the TP boards and capacity check afterwards with the imax. The TP might not start charging at 4.1.
 
Korishan said:
Open the unit and see if there is a pot that can adjust the cutoff voltage. Does the imax show 4.1 or 4.2 on the display? It would be better to charge using the TP boards and capacity check afterwards with the imax. The TP might not start charging at 4.1.
Click to expand...

I dont have it in front of me but i do remember that they start off at 3.6 /.7 and 4.x and 4.2. I will pull one apart tonight to see if i can adjust tonight after i get home. I know on lipo it says 4.20 on the screen but the testing from another multimeter is 4.1.

thanks for the suggestion, i would really like to use the unit and keep them working.

CB
 
image_lmqxll.jpg

image_vcthou.jpg
no
image_ikfwqc.jpg

image_ykmaot.jpg
adjustment and on the inside.

There is a three pin header on one side tho...hmmm
 
I'm going to guess that the 3 pin header is for programming the mcu. It's either i2c or spi. With 3 pins, it might be spi. If you follow the traces, you might be able to figure out which pin is which connection. Or, possibly do an internet search to see if you can find a way to program it.
There is probably an offset that needs to be set and can be set in software (similar to the way arduinos and others are done as well)
 
Korishan said:
I'm going to guess that the 3 pin header is for programming the mcu. It's either i2c or spi. With 3 pins, it might be spi. If you follow the traces, you might be able to figure out which pin is which connection. Or, possibly do an internet search to see if you can find a way to program it.
There is probably an offset that needs to be set and can be set in software (similar to the way arduinos and others are done as well)
Click to expand...

thank, you got me search into the correct area and was able to figure out how to do the calibration. one of my was purchased separately and would not let me go into the calibration mode so i will do more research in that area but I was able to move the rest way closer to the reading. This should drastically speed up the processing of the cells!

Thank you very much!

CB
 
Instead of using multiple TP4056s, I'm starting to use CC/CV DC-DC buck converters rated at 5/10A. More efficient, less wiring is needed, using a 12V power supply means using less thick wiring to achieve the same power rating, and it is very easy to change the current to charge cells.

TLDR: I'm starting to phase out TP4056s for adjustable buck converters.
 
Korishan said:
I'm going to guess that the 3 pin header is for programming the mcu. It's either i2c or spi. With 3 pins, it might be spi. If you follow the traces, you might be able to figure out which pin is which connection. Or, possibly do an internet search to see if you can find a way to program it.
There is probably an offset that needs to be set and can be set in software (similar to the way arduinos and others are done as well)
Click to expand...

Hahaha that is the exact same one I had and the same issue. I did try to reprogram it but it's MCU is different from the Original iMAX it think from memory it uses a 8mHz Crystal not the 16mHz. It is now been trashed minus the LCD screen. :)
 
I was able to get it closer but still didn't make it to 4.2. got them to 4.18 to 4.19. also, my tp4056 also don't max to 4.2, is this normal?
 
Some TP ic's don't top off. It's possible those are the fake ones. Or, those are the ones that are about 1% off (which, I'm sure there are some that could be as much as 2% off)
 
the tp4056 did not get as close to the 4.2 as the calibrated (to max) clone imax b6. So i guess at this point, I will take note on what the ending voltage is and store them by that. 4.2, 4.19.4.18 sorta piles. That will allow me to get back to processing the batteries. thanks Korishan (where in FL are you, around the Tampa area, my location?)
 
Nope, up near Gator Country ;)
 
You must log in or register to reply here.
Back
Top