http://i.imgur.com/N7BS8Ej.jpg
http://i.imgur.com/egysVzd.png
http://i.imgur.com/SvG7gjr.png
這份研究是由一群Tesla車主蒐集了286輛世界各地Model S的資料後
在Dutch-Belgium Tesla Forum上發布的
數據顯示大多數車輛在行駛了第一個50,000miles後電池容量會降低至95%
接下來電池劣化的程度會趨緩
而趨勢線顯示要行駛超過20萬miles後，電池容量才會趨近於90%
另外雖然數據不夠多，不過似乎一周用超級充電站充電兩次，每次充到90%是對電池最好的(?)
http://i.imgur.com/snGOeyD.png
這部分數據有點少，看看就好
底下也根據了循環次數還有使用日期做了類似的圖表：
http://i.imgur.com/lEjhrPp.png
http://i.imgur.com/wTSwd0S.png
最後他們的下一個目標是要看看行駛了100萬miles的電池組會發生什麼事
因為Tesla的設計是要讓這些車可以行駛100萬miles
開到30幾萬公里後電池才劣化到90%，我想這對大多數車主來說都夠本了
一年開1.5萬公里在台灣來說已經是平均以上
這樣也要開20年
對於電池劣化程度有疑慮的人可以好好參考一下這份情報
==============================================================================
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.