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Enquiries Regarding Battery Preconditioning


Treeri

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Greetings,
I will be acquiring an EV6 later this year; it will be my first electric vehicle. I have conducted extensive research over the last several months, and although most of my enquiries have been addressed, I still have issues about battery preconditioning and its function.

Kindly correct me if my remarks are erroneous.

The preconditioning before to a DC rapid charge is intended to elevate the battery temperature to around 21 degrees, its optimal operating state. To facilitate rapid charging.

However, if I have been driving for around two hours, would the batteries not already be sufficiently heated owing to the power being pulled from them?

If preconditioning is not performed, the battery will heat up as the DC fast charger begins to charge it, perhaps reaching its optimal temperature within a few minutes of charging.

I am certain I have overlooked something, which explains my bewilderment and my inquiry here.

I have not yet conducted a test drive; this would be perilous since I would likely sign right thereafter. I will wait till fall when I will have more time to enjoy the experience.

Thank you.

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In my experience, driving at standard highway speeds does not significantly elevate the temperature of the battery pack beyond a few degrees. Battery pre-conditioning is often necessary to achieve optimal DC charging rates. If the pack is at ideal temperature, the battery warmer remains inactive.
For the pack to exceed 20°C in summer, the external temperature must be between 25°C and 30°C.

Without the application of battery heating, the battery will ultimately warm up; but, due to the charging curve, you will forfeit the optimal charging times, which occur while the State of Charge is below 55-60%. Subsequently, the speed decreases to 80% and further diminishes if the charge exceeds 90%.

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I attempted it once and saw that battery conditioning used 4.5 kW for around 15 minutes, resulting in a significant reduction in miles per kilowatt-hour. It is likely only worthwhile if accessing a higher power charger.

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You now lack control over the preconditioning feature with the November 2023 software; the vehicle determines its need autonomously. Unless the vehicle is being driven aggressively, typical use will not elevate the battery to the necessary temperature during colder months.

We travelled to the Alps twice this year from January to March, covering a total of 4,800 miles. The vehicle autonomously selected charging stations, consistently preconditioning the battery; it opted for ultrarapid sites providing a minimum of 150kW, and typically approached full power throughout the charging process. One morning, we need charging but neglected to input the charging position into the satnav, resulting in a failure to precondition. At a 200kW charger, we received under 50kW, resulting in a scheduled 20-minute halt extending to almost one hour. Regrettably, charging a cold battery at 45kW does not effectively increase its temperature, resulting in a maximum output of 85kW after 40 minutes.

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