LiFePo4 Cells Voltage Drop after Charging, normal?


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drbacke

Member
Joined
Apr 3, 2019
Messages
60
Hello, everybody,
I got new China-LiFePo4 cells and after charging the voltage drops relatively fast by 0.1V.
Is the behaviour normal for LiFePo4? It seems quite strange to me.
All other values are ok, IR=6mOhm and the capactiyis ok.



image_wchzia.jpg
 

daromer

Moderator
Joined
Oct 8, 2016
Messages
5,662
Its normal. They should settle around 3.4-3.45V depending on type. Should state so in the datasheet.
 

Redpacket

Active member
Joined
Feb 28, 2018
Messages
1,434
Like I've said in other posts, I wouldn't be charging them to 3.6V regularly.
I only charge to ~3.45V/cell & they are still at 100% SoC or so close it doesn't matter.
Trick is to hold at 3.45V & let the current drop away & a bit of bypassing occur.
I found the pack balance kept going nuts at higher voltages, some cells would race off to high limit trip before others caught up, etc.
I like to keep my LiFePo4 cells on the flat part of the curve (at both ends both low & high).
 
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