來源：https://goo.gl/En63LE
Tesla battery degradation at less than 10% after over 160,000 miles,
according to latest data
根據最新數據顯示，Tesla 電池在超過 160,000 英里之後衰退不到10％
Battery degradation is one of the biggest concerns for electric car owners
and potential buyers, but data from Tesla battery packs have been very
reassuring so far.
電動車車主跟潛在買家最擔心的問題之一是電池退化，但是迄今為止，Tesla 電池組的
數據非常令人放心。
Now the latest data shows less than 10% degradation of the energy capacity
after over 160,000 miles on Tesla’s battery packs.
現在最新數據顯示，在開了超過 160,000 英里後，Tesla 電池組電量下降不到10％
A group of Tesla owners on the Dutch-Belgium Tesla Forum are gathering data
from over 350 Tesla vehicles across the world and frequently updating it in a
public Google file.
荷蘭-比利時 Tesla 論壇上的一群 Tesla 車主正在收集世界各地350多輛 Tesla 的數據，
並經常在公共Google文件中更新它。
We have previously reported on the data, but they have since added many more
vehicles and those vehicles have been driving a lot more – completing more
battery cycles.
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%.
數據清楚地表明，在第一個 50,000 英里（100,000公里）後，大多數 Tesla 電池組
容量將會減少約5％，但是過了 50,000 英里後，電量要再衰減另一個5%看起來相當困難
The trend line currently suggests that the average battery pack could cycle
through over 300,000 km (186,000) before coming close to 90% capacity.
目前的趨勢線表明，電池組在接近 90％ 的容量之前，平均可以超過 300,000公里
Here are the relevant charts from the data gathering effort (full chart on
the left and zoomed to 80% on the right):
以下是相關數據的圖表（上方完整圖表，下方把範圍縮減至80％-100％）：
https://i.imgur.com/N1B917a.jpg
https://i.imgur.com/o0mSfwl.jpg
Screen Shot 2018-04-14 at 2.56.15 PM Screen Shot 2018-04-14 at 2.54.02 PM
There are a few outlier battery packs out there and they tried to figure out
why by gathering other data, like frequency of DC fast-charging and daily
state of charge, but there’s no clear indication that any of those factors
have any significant impact based on their data.
有幾個離群值電池組在那裡，他們也通過蒐集其他數據試圖找出為什麼，
例如使用直流快充的頻率、每日充電狀態，但沒有明確證據指出這些因素中
的任何一個會因其而對電池組容量產生重大影響。
With this said, Jeff Dahn, a renowned battery researcher and the leader of
Tesla’s research partnership through his battery-research group at Dalhousie
University, said that he recommends charging to only 70% daily in order to
extend battery life.
著名的電池研究人員，Tesla在 Dalhousie 大學電池研究小組的領導人，Jeff Dahn表示，
建議每天僅充電到70％以延長電池壽命。
Tesla warns that it does not cover battery degradation from “battery usage”
under its Model S and Model X warranty up to any specific level:
特斯拉警告說，Model S/X 的電池保固並不涵蓋電池退化到任何特定等級：
“The Battery, like all lithium-ion batteries, will experience gradual energy
or power loss with time and use. Loss of Battery energy or power over time or
due to or resulting from Battery usage, is NOT covered under this Battery
Limited Warranty. See your owner documentation for important information on
how to maximize the life and capacity of the Battery.”
"與所有鋰離子電池一樣，電池隨著時間和使用將會經歷逐漸的電量或功率損耗。
本電池有限保修範圍不包含電池電量或功率因隨時間或由於電池使用而產生的電量損失。
有關如何最大限度地延長電池壽命和容量的重要信息，請參閱您的車主文件。"
But for the Model 3, Tesla introduced a warranty with a new 70% battery
capacity retention guarantee.
但對於Model 3，Tesla 推出了新的70％電池容量保證保固。
The Model 3 is equipped with different battery cells and a new battery pack
architecture, but if data from the Model S is any indication, it shouldn’t
be an issue.
Electrek’s Take
Battery degradation is often a big concern for new electric vehicle buyers.
To a certain degree, the Nissan Leaf might be to blame since it had a lot of
issues in that regard, which is why Nissan has a much more comprehensive
battery capacity warranty now.
新電動車買家常常擔心電池退化問題。
在某種程度上，Nissan Leaf 可能會被抱怨，因為它在這方面有很多問題，
這就是為什麼 Nissan 現在擁有更全面的電池容量保證。
A recent study shows that with the original 24 kWh pack loses about 20% of
their capacity over 5 years and Nissan’s more recent 30 kWh battery pack
loses capacity more quickly than the older pack:
最近的一項研究表明，Leaf 最早的 24kWh 電池組在5年內損失了其容量的20％，
而 Nissan 最近的 30kWh 電池組的容量比舊電池組的容量損失更快：
https://i.imgur.com/8r4Bm4e.jpg
But Tesla’s vehicles arguably have a much more advanced battery thermal
management system than the Leaf and data from early Model S vehicles has been
really encouraging as we can see above.
但是 Tesla 的車輛擁有比 Leaf 更先進的電池熱管理系統，
而早期 Model S 的數據確實令人感到鼓舞，正如我們上面所看到的。
As for anecdotal data, my own Model S, which is one of the first 2,000
vehicles ever made, only lost about 6% capacity over 5 years.
而我自己的 Model S 是最早期的頭兩千輛車之一，5年多僅僅損失了6％的容量。
CEO Elon Musk has been hyping even more potential for Tesla battery pack by
once referring to a battery pack that Tesla was testing in the lab. He said
that the company had simulated over 500,000 miles on it by repeatedly cycling
it and that it was still operating at over 80% of its original capacity. At
that point, the car itself is more likely to give up than the battery pack at
this kind of mileage.
Tesla CEO Elon Musk 在一次訪談中曾經提到過在實驗室測試中的 Tesla 電池組的潛力。
他表示，該公司通過反覆循環模擬了超過50萬英里的行駛里程，電池組仍以超過原始電量
80％運作。就這點來看，到了這種里程汽車本身比電池組更有可能被丟棄。
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之前在板上也有發過相關新聞的文章：
文章代碼(AID): #1O6BXAyL (car)
文章網址: https://www.ptt.cc/bbs/car/M.1478015050.A.F15.html
文章代碼(AID): #1Oy2wH0g (car)
文章網址: https://www.ptt.cc/bbs/car/M.1492135569.A.02A.html
這篇新聞可以算是之前的數據更新
蒐集的車輛數據也更多
也有 Nissan Leaf 的電池組資料
雖然 Leaf 的電池組比較小，所以衰退會更明顯是必然的，但沒想到差距有點大
尤其是更舊更小的 24kWh 電池組表現反而要比更新更大的 30kWh 電池組要來的好的多
這點讓人感覺到有些疑問
是換了電池供應商嗎？