I purchased an IP2368 100W PD charger module, built a 4S 21700 Li-ion pack and wired in a 4S BMS and the IP2368 module.
At first it seemed to be going to plan, but I tested it with my DC load and at 20V output it struggled to give much more than 72W before the voltage dropped right off.
I figured that maybe if I built a 6S pack then things would be better.....
So increased the pack to 6S and fitted a 6S BMS.
Concerning the module, there are a couple of things to do. First is to change a resistor on the module to tell the IP2368 ic that it's a 6S configuration, and also change a 5V linear regulator on the module as the one fitted is rated at 18V (OK for 4S), but too low for a 6S. I used a LM78l05.
So I thought that all would be good, but alas, when I charge through the type C port using a 100W UGREEN charger, the pack only charges up to 21V, not 25.2V. It is like the IC thinks it's a 5S and not a 6S.
In the datasheet, to set as a 6S we should use a 27K resistor. Which is what I did, but got unexpected results.
I googled this but I couldn't find anyone that had modified this module to run 6S.
I'm pretty sure that all the setting resistors are correct for what I want.
Does anyone here have any experience? Same issue maybe? Or working flawlessly?
Attached are a couple of pictures of the module (from Aliexpress) and the datasheet for the IP2368 (translated from the Chinese datasheet)
Thanks in advance. If more info os required then please let me know.
I used 21700 Li-ion cells in a 6S 2P configuration. I don't have the datasheet I'm afraid, but I'm quite sure that it is not the cells that are at fault as I have built packs for other projects with them before and they work fine.
My friend uses them to build the battery packs for electric jet surf boards and e-foil boards. He had a surplus of them so he gave me a few to play with.
I highly recommend you contact your friend and get a copy of the data sheet. Also verify they are protected cells, if not you have a high chance of a fire as you do not appear to fully understand what you have.
" Thermal runaway in lithium-ion batteries is a critical safety concern, often overlooked until it’s too late. This phenomenon occurs when a battery becomes self-destructive due to uncontrolled thermal conditions, leading to potential hazards. Understanding thermal runaway is crucial, not just for battery manufacturers but also for end-users, ensuring safety in various applications, from smartphones to electric vehicles." (from following link) Understanding Thermal Runaway in Lithium-Ion Batteries - EcoFlow US Blog
Thanks for the link. I like informative bed time reading.
Maybe my wording was a little incorrect. I have a BMS on the pack with all the necessary safety features. So I don't have an issue there.
My friend has been using these spec cells for a couple of years now with absolutely no problems. And while I'm not an expert on lithium ion technology, I have a fair amount of experience, having used Li-ion, LiPo and LiFePo4 cells in many projects over the last few years. I'm always pretty conscious of the dangers of them.
But anyway, my question regarding the IP2368 module still stands. I don't understand why the module seems to think that I have 5S when I have 6S.
When I remove the module and plug the pack into my imax B6 it registers the pack as a 6S and charges accordingly up to 25V.
Did you end up finding a solution? I am having the exact same issue but I am using one of the "pro" chargers you can get from AliExpress (its a black smaller PCB but otherwise still built around the same IP2368). It won't charge past 21 volts either and I triple checked the resisters are correct for my setup.
Didn't seem to have any luck. Maybe something I was doing wrong, I don't know. I followed the datasheet to the letter as far as I know.
I ended up going back to a 4S 3P using 21700 cells (The pack is 1200mAh), and it works flawlessly.
Change the battery type to lI iron. From the description, it looks like the battery type is set to LiFePO4. Make sure the bat_mode pin (pin 46) is floating or high.
When this pin is floating or hight the battery type is set to Li ion and when it is connected to ground it is set to LiFePO4.
Hi Matt!
I'm having the same problem. 6s only charging to about 5s voltage. My black module from Ali is called "Bidirectional charging module IP2368pro". It is configured to 6s LiFePO4 (R7=27k, R2=0, R4=10k).
Battery type is EVE40135, 20Ah 6s, discharge rate 1C. In my setup battery current is only 3-4A. This IP2368pro module discharges battery to 14.5...15V (correct 6s LiFePO4 discharge) but only charges to 18.0V when it should charge up to 21.6V.
Do you have solution to this?
@y0lik
Hi,
Sorry, but I don't have the solution.
In the interests of getting things done, I just reverted to a 4S 2P setup using 4mAh 21700 cells. It works well and can output around 97W, but gets a bit warm! But it's fine for what I need.
Cheers,
Matt
