Re: [EVDL] Zummcraft LiMn2O4 battery disassembly.

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Re: [EVDL] Zummcraft LiMn2O4 battery disassembly.

I 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 -- next part -- An HTML attachment was scrubbed... URL:

Re: [EVDL] Curtis 1238-6501 State of Charge

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

Re: [EVDL] Curtis 1238-6501 State of Charge

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Re: [EVDL] Curtis 1238-6501 State of Charge

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

Re: [EVDL] Curtis 1238-6501 State of Charge

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Re: [EVDL] Voltage SOC on LFP (was Curtis 1238-6501 State of Charge)

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

Re: [EVDL] Curtis 1238-6501 State of Charge

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

Re: [EVDL] Curtis 1238-6501 State of Charge

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[EVDL] EVLN: EV-newswire posts for 20170808

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[EVDL] Voltage SOC on LFP (was Curtis 1238-6501 State of Charge)

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

Re: [EVDL] Curtis 1238-6501 State of Charge

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Re: [EVDL] Curtis 1238-6501 State of Charge

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