For some reason, I didn't see Willie's reply below. I may be excessively
argumentative.
However, my intent is to give accurate information. A lot of things are said in
these forums that
can both cost people a lot of money unnecessarily, shorten the life of their
cells or even be a hazard.
Science is absolute and verifiable. No need for speculation. The data shows it
to be true or false.
I have no experience with top balancing Lithium batteries. I have read a lot
and most of what I see
written is not verified or backed up with data.
What you say about balancing or how balancing circuits work I personally have
not verified so I must assume you have.
It sounds damaging to cells IMO. The purpose of the CC CV charge algorithm is
to achieve maximum capacity in a cell.I understand that the purpose of
balancing is to achieve maximum charge in every cell in a series.I think it
damages cells. A CC CV procedure cuts off based on current not voltage. C/20 is
what is most recommended.Still the purpose is get get a maximum charge with
minimum damage for cycle life.
A BMS is good and can help protect a pack but top balancing I'm not convinced
is achieving what is advertised.
On Monday, March 15, 2021, 10:29:32 PM CDT, Mark Abramowitz via EV
<[email protected]> wrote:
At the risk of being called “overly argumentative” (though I’m sure you’ve
already pegged me for that), these discussions help everyone and provide for
greater clarity. They teach everyone, including those who think they know all.
I like accuracy, and far too often false or inaccurate stuff posted is left
standing. And then people start believing it.
That’s just a general statement.
- Mark
Sent from my Fuel Cell powered iPhone
> On Mar 15, 2021, at 7:34 PM, Willie via EV <[email protected]> wrote:
>
>
>
>> On 3/15/21 11:43 AM, paul dove via EV wrote:
>> I see. Still not correct. OCV for Lithium Iron Phosphate is 3.38 volts per
>>cell. Holding cells above this voltage damages the cells.
>
> Paul, I haven't before pegged you as an excessively argumentative guy. My LFP
> days are long past and not to be resurrected. However, I recall that LFP
> cells settled back to around 3.3v after charging to a higher voltage and with
> by-pass balancing modules set to 3.45 up as high as about 3.6v. As I recall,
> no by-passing occurs below about 3.45v. Ideally, a pack becomes balanced when
> all cells/modules are by passing at the by pass voltage. Someone still
> fiddling with EVPower or miniBMS modules might confirm or deny.
>
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