GM vs. Tesla:Bolt & Model 3電池組對比 - 汽車

來源：https://goo.gl/4QBQzH

GM VERSUS TESLA: BOLT EV AND MODEL 3 BATTERY PACKS COMPARED

It turns out the Chevrolet Bolt EV battery pack is simpler to assemble than
that of the Tesla Model 3, while the Tesla pack is more energy dense by
weight.

Bolt EV 電池組比 Model 3 更容易組裝，而 Tesla 電池組的能量重量比更高。

We had an excellent video here recently on InsideEVs: “Watch Chevy Bolt
Battery Reassembly.” I was impressed with the ease that the Bolt EV battery
pack went together. John Kelly was very thorough, even measuring the weight
of two of the Bolt EV modules so we can compare those with Tesla’s battery
weight as well.

我們做了一部很棒(很長)的影片放在 InsideEVs 上。
Watch Chevy Bolt Battery Reassembly:(很長，約113分鐘)
https://youtu.be/ZBzRKglr95U

Bolt EV 電池組組裝的容易程度令人印象深刻，John Kelly 做的工作非常的徹底，
所以我們可以測量兩個 Bolt EV 模塊的重量，並且拿來與 Tesla 比較。

Conclusion:

GM’s pack is simpler to assemble in this author’s opinion. However, as
expected, Tesla has the edge in the energy density department.

結論：

GM 的組裝更為簡單。然而，正如預期的那樣，Tesla 在能源密度方面處於領先地位。

First, a little background on how these two packs cool their cells. Tesla’s
method involves running a ribbon-shaped cooling tube between the cells. They
have kept this technique since the Model S and are still using it in Model 3.
https://i.imgur.com/CFYxeUr.jpg
https://i.imgur.com/MLwX1pY.jpg

首先，介紹這兩種電池組如何冷卻電池。 Tesla 的方法是在電池之間圍繞帶狀冷卻管。
自 Model S 以來，他們一直使用這種技術，並仍在 Model 3 中使用它。

Tesla has attempted to automate the assembly of the Model 3 battery pack and,
unlike Model S, they are now attaching the individual cells to the cooling
ribbon. This procedure is described in more detail in our article: Tesla
battery pack modules made like a machine gun. It also appears likely that
Tesla is attaching the cells to the cooling ribbon with glue.

Tesla 試圖自動化 Model 3 電池組的組裝，並且與 Model S 不同，
他們現在將單個電池連接到冷卻帶上。
這個過程在我們的文章中有更詳細的描述：像機槍一樣製造的 Tesla 電池組模塊。
(文章連結：https://goo.gl/8euctD )
Tesla 似乎也可能用膠水將電池連接到冷卻帶上。

Obviously, the whole process is difficult as Tesla has twice delayed the
promised “5,000 Model 3’s per week” production bogey.

顯然，整個過程是很困難，
因為 Tesla 已經兩次推遲了承諾的“每週5000個 Model 3”的生產目標。

The Bolt EV pack is much simpler. The individual prismatic cells simply sit
on a cooling plate with a thermal mat between the cells and the plate.

Bolt EV 電池組簡單多了。
個別方型電池就只是放置在電池和電池板之間的冷卻板上。

Below is a great screenshot from the video showing the plate.
https://i.imgur.com/jQNKhRq.jpg


Next is a screenshot of Professor Kelly lowering section 5 modules in place.
接下來是 Kelly 教授放下第5部分模塊的截圖。

https://i.imgur.com/3t5d2ky.jpg

Pretty simple and easy to assemble.
非常簡單和容易組裝。

.…and another screenshot showing the cooling plate.
https://i.imgur.com/ZczaWQt.jpg

散熱板的截圖：
https://i.imgur.com/Kt3zGRW.jpg

Energy Density

At the 41:57 mark in the video we have a screenshot (below) of Professor
Kelly weighing modules 1 and 10 just prior to setting them on the cooling
plate. We must subtract the weight of the holding fixture to get the total
weight of modules 1 and 10.

能量密度

模塊1與10加起來的重量如圖：
https://i.imgur.com/u5oF9vF.jpg


The Bolt EV has 10 modules: 8 with 30 cells each and 2 with 24 cells. Module
1 and 10 are the bigger modules with 30 cells. We also find 57 kWh of usable
energy in the Bolt EV pack thanks to some sleuthing by fellow engineer Jeff
Nisewanger in “ Jaguar and Chevy have LG in common.” This gives us 5.95 kWh
for one big Bolt EV module, which results in a module energy density of 11.9
#/kWh.

Bolt EV共有10個電池模塊：其中八個有30個電池，另外兩個有24個電池。
其中模塊1與10是有30個電池的大模塊。
我們還發現 Bolt EV 電池組中有 57 kWh 的可用能量，
這要歸功於 Jeff 在"Jaguar and Chevy have LG in common." 所做的一些調查。
這讓我們知道一個 Bolt EV 的大模塊有 5.95 kWh的電量，
能量密度則為 11.9#/kWh。 (看不懂#是什麼單位)

Tesla battery module weights are based on weights published in HSR Motors
online catalog (aka Jason Hughes). Usable energy per Jason Hughes is 98.4 kWh
for the P100D pack. There are 16 modules in that pack, so we can get the
energy density of 1 module of 10.7#/kWh. Energy density of Tesla Model 3
cells assumed equal to P100D cells. See “Tesla Model 3 2170 cells=same
energy desity as P100D 18650 cells”

Tesla 電池模塊重量是基於 HSR Motors 在線目錄（又名Jason Hughes）上發布的重量。
每個 P100D 電池組的可用能量為 98.4 kWh。
該電池組中有16個模塊，因此我們可以得到一個模塊有 10.7#/kWh的能量密度。
Tesla Model 3 電池的能量密度假定等於P100D電池。
參考：https://goo.gl/5ndf2P

Therefore, Tesla’s module is more energy dense by weight than the Bolt EV
module. Not a surprising finding.

因此，Tesla 模塊的重量比 Bolt EV 模塊的能量密度更高。這並不令人意外。
https://i.imgur.com/S4qQKl7.jpg

However, there is one caveat to all this. We have not included the weight of
the case in our calculations and Tesla’s case may be heavier than the Bolt
EV case. Why? Because Tesla’s battery chemistry is much more flammable than
GM’s and it requires more armor to deflect foreign objects.

然而有件事情必須說明。在這些計算中並沒有包含外殼的重量，
Tesla的外殼可能比Bolt EV的外殼更重。為什麼？
這是因為 Tesla 的電池化學性能比 GM 的更易燃，需要更多保護才能阻擋外界物體。

So, Tesla may not have as big an edge as these numbers indicate if we were to
include the cases in the calculations.

所以，Tesla 可能沒有像這些數字表現出來的那樣有那麼大的優勢。



Bolt的電池組這種散熱方式沒問題嗎？

電池組中間的電池都沒有接觸到散熱區域，這樣有部分電池會衰退的比較快吧

有不少汽車廠還沒上市的電動車也都是用這種方型電池而不是圓柱型電池

期待以後也會有類似的拆解來做比較

畢竟電池都是那幾個大電池廠做的，同個電池廠來源相差不大

但電池組設計就考驗到各家車廠的設計功力了

--