MassDeduction
Posts: 65
Joined: Tue Feb 25, 2020 3:24 pm

Re: Comparing layout of the Soul EV battery with other EVs

Sun Nov 15, 2020 5:07 pm

JejuSoul wrote:-
[...]N iro EV 64kWh has 98 cell triplets = 294 cells : 3 * 60Ah = 180Ahr : 98 * 3.6V = 352.8V
K ona Electric 64kWh has 98 cell triplets = 294 cells : 3 * 60Ah = 180Ahr : 98 * 3.63V = 356V

N iro EV 39.2kWh has 90 cell pairs = 180 cells : 2 * 60Ah = 120Ahr : 90 * 3.6V = 324V
K ona Electric 39.2kWh has 90 cell pairs = 180 cells : 2 * 60Ah = 120Ahr : 90 * 3.63V = 327V
[...]

Forgive my rookie question, but calculating the "C" rating on these battery packs, would it be based on the 60Ah, or based on the 120 or 180 Ah?

JejuSoul
Posts: 1580
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Location: Jeju
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Re: Comparing layout of the Soul EV battery with other EVs

Mon Nov 16, 2020 5:39 am

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Using data for the MY2020 Soul EV from Kia Motors UK : All-New Soul EV> SPECIFICATION

Image

We see that the 64kWh Soul EV is identical to the 64kWh Kona Electric.
The current 64kWh Niro EV has the identical specs. - Kia Motors UK : e-Niro > SPECIFICATION

Soul EV 64kWh has 98 cell triplets = 294 cells : 3 * 60Ah = 180Ahr : 98 * 3.63V = 356V

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C-rate is defined as the charge / discharge current divided by the nominally rated battery capacity.
The nominally rated battery capacity of the pack is 180Ah.
A rapid charge of 64kW will have a C-rate of about 1 on such a battery pack.

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The codes for using Torque Pro can be found by clicking the link in the website icon under my user name on the left.

MassDeduction
Posts: 65
Joined: Tue Feb 25, 2020 3:24 pm

Re: Comparing layout of the Soul EV battery with other EVs

Mon Nov 16, 2020 1:09 pm

JejuSoul wrote:[...] C-rate is defined as the charge / discharge current divided by the nominally rated battery capacity.
The nominally rated battery capacity of the pack is 180Ah.
A rapid charge of 64kW will have a C-rate of about 1 on such a battery pack.

Generally speaking for lithium ion batteries 0.25C is the ideal charge rate (any faster will increase battery degradation, any slower will provide no significant benefit). I know that some battery chemistries tolerate faster charging more than others will, but "tolerate" isn't the same as "ideal". The rule of thumb as I understand it is that the ideal C rate would be an amperage rate that's 25% of the Ah rating of the battery. So an 180 Ah pack should ideally be charged at 45a or lower, ideally. Do you know any differently than me?

Thanks for the response. I was unclear on whether the C rate should be calculated on all three sections of the pack added together, or on the 60 Ah rating of each individual section. And you're telling me that it's based on them all together, as I understand it.

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