[p7wang]

Tesla battery researcher unveils new cell that could last 1 million miles in 'robot taxis'

Tesla’s battery research partner has released a new paper on a battery cell that could last over 1 million miles,...

electrek.co

Looking at the chart, it seems we should aim to keep our battery between 40-60% for longest battery life... although... 1000 charge cycling once a week is already 20 years. Keeping between 25-75% should be good for 30 years.

 

[bww129]

Battery temperature and rate of charge/discharge are also important factors. Avoiding high temperatures for extended periods of time and going easy on the accelerator will also help the battery last longer.

 

[p7wang]

Yep, looks like 4 key items to look at:

1. High temperatures.
2. Overcharging or high voltage.
3. Deep discharges or low voltage.
4. High discharges or charge current.

Battery Lifetime: How Long Can Electric Vehicle Batteries Last?

May 31st, 2016 by Christopher Arcus Electric vehicle have become a common sight on streets today, and many people have started to enjoy the quiet comfort, getting used to charging at night and silently doing errands. Electric vehicles are new enough to wonder, how long will they last? This is...

cleantechnica.com

 

[Packard V8]

This gets covered here about once a week. The Bolt was designed as an appliance. Normal operation will not harm the battery. Exceptional amounts of worry and careful handling may not extend the life of the battery.

jack viens

 

[bww129]

It's safe to assume that slightly more effort was spent on the design of the Bolt than an appliance, but you're absolutely right that normal operation won't harm the battery. However, there are things you can do to minimize battery degradation. GM engineers have done a good job of incorporating safety margins into the battery pack design and conditioning system to make it last at least the duration of the factory warranty. They can't control how many times the battery is cycled, the depth of discharge, rate of discharge, and rate of charge which all factor into battery life.

 

[redpoint5]

GM does control depth of charge/discharge, and rate of charge/discharge. Full is not actually 100% of the batteries capacity to accept a charge, and empty is not flat dead. It won't output more than about 200 HP (or whatever the power limit is), or charge at faster than ~55 kW with a taper. Not only all that, but the temperature is kept within certain limits.

Everything is a balance, and GM has built the car to what they think is the best compromise of all things considered. If people are concerned that it isn't enough, they can modify their behavior in the quest to preserve the health of the battery. In my estimation, GM wouldn't have given the ability to select the maximum charge percent if it had no positive benefits.

 

[bww129]

GM does control depth of charge/discharge, and rate of charge/discharge.

They only limit the maximum values, which appear to be conservative. Driving the car hard and fast charging every day will have a negative effect on battery life, but you could do it and that could be considered normal to some people.

If people are concerned that it isn't enough, they can modify their behavior in the quest to preserve the health of the battery.

Yep, that's the bottom line.