Cell temp spikes during charge up faster than the rest

andreshs1

New Member
Joined
Jan 31, 2022
Messages
22
Hi all

I have 8 x CATL 320ah cells on a 2P4S setup and I one of the cell pairs is giving me a headache.

This is the pair of cells that act as positive anode, and somehow, the temperature is always 2 degrees warmer than the rest (e.g. cells 1, 2 & 3 are at 28 Centigrade, and cell for at 30 centigrade). then, when I turn the charger or, the temperature of cell 4 spikes within minutes, if I dont stop the charger, it will easily go over 40 centigrade

I have removed the BMS terminals and cleaned it, yet, the issue persists (attaching a photo of my setup and a reading example

any ideas / suggestions please?

Regards
Andres
 

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sunshine_eggo

Happy Breffast!
Joined
Oct 26, 2021
Messages
4,005
Location
USA
Verified loose connections/bad crimps aren't generating heat?

Verified these readings with a second measurement?
 

andreshs1

New Member
Joined
Jan 31, 2022
Messages
22
Hi there
actually, that is a good point, I might replace the battery wires connected to that cell to ensure that it is all good

I have checked for loose connections, but everything seems to be OK

Cheers
 
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