In LFP, temperature influences voltage more than SOC in the region of
20% to 80% SOC. The voltage changes just a tiny amount between 20% and
80% SOC.
Basically, if the voltage changes it is more likely to be due to a
change in temperature, than a change in SOC.
Indeed, you could measure the
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paul dove via EV wrote:
Sure you can. Voltage is the only way to discern SOC.
You just can't measure accurately under load. You have to measure open circuit
voltage.
www.mdpi.com/1996-1073/9/11/900/pdf
This paper mainly discusses the higher-voltage Li-Ion cells, which have a larger
voltage ch
It is difficult or perhaps even impossible to determine the SOC on
LFP from voltage measurements alone. At least to do it with any
accuracy. You can measure the temperature on each cell in addition to
voltage to _perhaps_ get a better handle on the SOC, but still you
can't get a very accurate S
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need
two batteries. A matched pair. So nominal voltage is 51.2volts fully charged
56vdc. The Zuumer is a lean to steer technology. Front wheel drive. Lawrence
Rhodes
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The BMS does not need to know the SOC.
The User Interface (dash) often presents an estimation of the SoC and
this means that
either the car (Motor Controller) or the BMS needs to measure the
current
and integrate over time to estimate the Ah in/out of the pack so that an
estimation
of SoC is availa
rg
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I am not a lithium battery expert. But with any kind of battery, I would do
a load test to identify the problem cells.
Put 20-40 amps on the fully charged battery, and measure the voltage of each
cell in turn. The stinkers will quickly reveal themselves.
Be aware that you may find a REVERSE
Hi
LFP:
You might with some(all?) LFP even find a slight hysteresis in pack voltage, at
exactly the same SOC..
(most visible if you are in the 30-70% SOC-zone)
depending on ..if you have had a regen or a discharge pulse as your last event,
then the no load voltage seems not to be exactly the
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