I'm trying to design a parallel charger for 4 18650 batteries using 4 TP4056. The main idea is to isolate each battery when the "External Power" is connected, so each charging circuit can charge its battery and the load can remain powered. Then, when the "External Power" is removed, the TP4056s are disconnected via an N-channel Mosfets and all the batteries are connected in parallel via P-channel Mosfets. If I'm able to make it work, the next stage will be to try connect the "Battery pack" to a BQ27441.
In the schematic, I'm including protection for each battery, and I use the suggestion of this for preventing reverse polarity.
This is the first time I'm trying to make something like this, so I'm not sure if my approach is the correct one. Do you guys have any suggestion/comment?
Here I attach the first attempt, this circuit will be replicated 3 more times, so the final design will have 4 TP4056 + protection + ptcs + N/P-channel Mosfets.
Thanks in advance!