KenDan
New Member
Because LifePO4 have such a flat discharge curve, you can't really balance based upon cell voltage in the 10% to 90% SOC range. If you have cells with only a moderately small difference in their state of charge, you probably don't see any noticeable difference in their voltage. That basically means the balancer probably can't do much.
It's only at an very low or very high state of charge where voltage differences will show up. That's why you have to "top" balance (or "bottom" balance). Trying to balance in the middle of the charge range is basically futile with LifePO4.
This was the thing that was tripping me up on balancing LifePO4 cells. All my previous experience with lithium batteries was Lithium Polymer. LiPo has a lot more slope on the discharge curve and can actually be balanced to a certain extent even in the middle of their operating voltage range.
It's only at an very low or very high state of charge where voltage differences will show up. That's why you have to "top" balance (or "bottom" balance). Trying to balance in the middle of the charge range is basically futile with LifePO4.
This was the thing that was tripping me up on balancing LifePO4 cells. All my previous experience with lithium batteries was Lithium Polymer. LiPo has a lot more slope on the discharge curve and can actually be balanced to a certain extent even in the middle of their operating voltage range.
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