http://i.imgur.com/N7BS8Ej.jpg
http://i.imgur.com/egysVzd.png
http://i.imgur.com/SvG7gjr.png
这份研究是由一群Tesla车主蒐集了286辆世界各地Model S的资料后
在Dutch-Belgium Tesla Forum上发布的
数据显示大多数车辆在行驶了第一个50,000miles后电池容量会降低至95%
接下来电池劣化的程度会趋缓
而趋势线显示要行驶超过20万miles后，电池容量才会趋近于90%
另外虽然数据不够多，不过似乎一周用超级充电站充电两次，每次充到90%是对电池最好的(?)
http://i.imgur.com/snGOeyD.png
这部分数据有点少，看看就好
底下也根据了循环次数还有使用日期做了类似的图表：
http://i.imgur.com/lEjhrPp.png
http://i.imgur.com/wTSwd0S.png
最后他们的下一个目标是要看看行驶了100万miles的电池组会发生什么事
因为Tesla的设计是要让这些车可以行驶100万miles
开到30几万公里后电池才劣化到90%，我想这对大多数车主来说都够本了
一年开1.5万公里在台湾来说已经是平均以上
这样也要开20年
对于电池劣化程度有疑虑的人可以好好参考一下这份情报
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https://goo.gl/w10wmF
Despite being one of the main concerns with potential new electric vehicle
buyers, battery degradation is starting to look less like an actual issue.
Earlier this year, we reported on new data showing very little capacity loss
over high mileage and now we have significantly more data backing this claim
through a new survey.
A group of Tesla owners on the Dutch-Belgium Tesla Forum are gathering data
from 286 Tesla Model S owners across the world and frequently updating it in
a public Google file.
The data clearly shows that for the first 50,000 miles (100,000 km), most
Tesla battery packs will lose about 5% of their capacity, but after the
50,000-mile mark, the capacity levels off and it looks like it could be
difficult to make a pack degrade by another 5%.
The trend line actually suggests that the average battery pack could go
another 150,000 miles (200,000 miles total) before coming close to 90%
capacity.
Despite a few outliers, the data looks consistent:
The study tried to explained the outliers with data on frequency of 100%
state of charge, use of Superchargers, and near full discharge.
It’s hard to get much out of the data at this point, but it seems that 90%
charge level appears to be the ideal daily charge level and surprisingly,
frequent Supercharging (twice a week to daily) appears to actually be
beneficial in preventing battery degradation.tesla-battery-degradation-6
Coming back to overall battery degradation. Looking at the data from a
mileage standpoint is probably the most simple way to interpret it, but it
can also be interesting to look at age and battery cycles.
They made similar charts using those metrics instead:
CEO Elon Musk once referred to a battery pack Tesla was testing in the lab.
He said that the company had simulated over 500,000 miles on it and that it
was still operating at over 80% of its original capacity. It sounds crazy.
The car itself is more likely to give up than the battery pack at this kind
of mileage, but based on this new data, it looks a lot more plausible.
The next step is a 1 million-mile battery pack. Considering Tesla is aiming
for its drive unit to last 1 million miles, it would make sense to have the
same goal for the battery pack.
Of course, it would take 80 years for an average driver to travel 1 million
miles, but that’s expected to change. With the advent of self-driving cars
and car sharing networks, like ‘Tesla Network‘, it is expected that cars
will travel a lot more miles in much shorter periods of time.
The capacity for a drivetrain to handle 1 million miles might sound like an
overkill now, but that may not be the case in the near future.