Why do EV's not follow a CCCV charge?

Discussion in 'General' started by SuchBoard, Dec 7, 2021.

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  1. SuchBoard

    SuchBoard New Member

    I'm seeing a lot on the internet about CCCV charging, but when I look at car batteries most curves don't seem to follow CCCV.

    Is this because CCCV is only for longevity and car batteries are manufactured in between safe margins?

    Thanks in advance :)
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  3. bwilson4web

    bwilson4web Well-Known Member Subscriber

    It looks like there are two charging curves:
    • triangular - quick rise to peak rate and a steady ramp down
    • square - a quick rise to a peak rate that holds constant until about 80% when it tapers down
    I don't think we have enough data on which approach is better but the 'square' is close to the CCCV profile. We are still learning what makes best sense for the type of battery chemistry and Battery Management System (BMS) approach. For example, I have a 2019 Std Rng Plus Model 3 that uses the triangular fast DC charge profile. But at home, +95% of my miles, I only L2 charge to 68%. It appears my 240 mile initial range is now closer to 232 after nearly 3 years and 57,796 miles.

    Bob Wilson

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