Regen c ratings Effect on cell longevity

Batteries, Chargers, and Battery Management Systems.
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Jestronix   10 kW

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Regen c ratings Effect on cell longevity

Post by Jestronix » Nov 02 2016 6:40am

So what effect does regen have on batteries and what is a good c regen rate? The constant micro charge and discharge events. must create some stress. I see about 1c max on my cells for regen , above this I'd say will cause damage?

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wesnewell   100 GW

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Re: Regen c ratings Effect on cell longevity

Post by wesnewell » Nov 02 2016 12:52pm

All depends on cell type. 1C is standard charge rate for rc lipo. But it's probably 0.5C or less for most 18650 cells.
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Jestronix   10 kW

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Re: Regen c ratings Effect on cell longevity

Post by Jestronix » Nov 02 2016 3:42pm

wesnewell wrote:All depends on cell type. 1C is standard charge rate for rc lipo. But it's probably 0.5C or less for most 18650 cells.
Yeh that's what I was thinking, seems took batteries cop a bit of a beating , half hour to charge 2000mah means they are pushing 2c and they would love u to buy more when the packs die early. So 1c on the high frag packs seems ok.

My concern is more the constant micro cycles u see in regen.

Hillhater   100 GW

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Re: Regen c ratings Effect on cell longevity

Post by Hillhater » Nov 02 2016 4:00pm

Different types of cells have different performance and life characteristics.
So unless you are lucky and find some specific research results relavent to your particular cells and situation, you would have to test under the specific conditions you anticipate using...regen rate, duration, frequency, SOC, temp, etc etc etc.
However, i have always wondered as to why Toyota have stuck with the NMhi cells in their Hybrids which see high rates and frequency of regen. ?...i suspect they have more experience and data than most on that topic.
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atomek1000   100 W

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Re: Regen c ratings Effect on cell longevity

Post by atomek1000 » Nov 05 2016 2:38pm

You can set regen at 1-2C with no problem with li-ion. It is only 1 second spike in most cases. I would only be concerned if downhill with it for 5 minutes, but even this would not damage the pack for sure. Fast charge is mainly bad because of generated heat and saturation in lithium pores(more info is searchable on net) but short time peaks of charge current should not be a concern.

999zip999   100 GW

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Re: Regen c ratings Effect on cell longevity

Post by 999zip999 » Nov 05 2016 5:26pm

Regen I need reprogram my controller it's hitting 50amp spikes on my A123 20ah 24s pack as read by the C.A. ? I know that's only a split second. Plus the voltage has to run thru aluminum blocks between the tabs. It probably 7 or 11 amps. I do have reprogram. It was a lot harder with the muxus 3,000 5t. Now with the muxus 3,000 4t it's alot less regen kick. Yes monster bolt down torque arms. I tink it wakes them up.
There's no way it regens that hard. Just spikes.

999zip999   100 GW

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Re: Regen c ratings Effect on cell longevity

Post by 999zip999 » Nov 05 2016 9:15pm

A123 are great cell heavy yes , but who knows how long they last ?

Jestronix   10 kW

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Re: Regen c ratings Effect on cell longevity

Post by Jestronix » Nov 06 2016 6:27am

A123 , every time I see their graphs and real world feed back, u can see they absolutely trounce competitors in cycle life and abuse.

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