Tesla 4680 vs 2170 battery cell test - 電動汽機車

簡單說是此時此刻4680的電量密度比2170低，244 wh/kg : 269 wh/kg，但是存在成本優
勢一組電池包少了3600美金，並且會持續擴大到5500美金。

個人覺得便宜的電動車浪潮可能會比想像中的快襲來，類似46xx尺寸的電池技術不會只有
特有，對岸寧德時代也在規劃幫BMW做印象中是4690的電池，2025年和油車在價格上黃金
交叉可能不會被原物料那些影響，鴻海的平價電動車也加油

啊對了這篇文章電黑車板應該90%人看不懂，笑，他們只看的懂對岸來源堪慮的簡體字訊
息


Tesla 4680 vs 2170 battery cell test reveals lower energy density in the Texas
-made Model Y

https://www.notebookcheck.net/Tesla-4680-vs-2170-battery-cell-test-reveals-low
er-energy-density-in-the-Texas-made-Model-Y.669162.0.html


Those Model Y buyers who queue for an Austin-made unit with the 'revolutionary
' 4680 battery cell may be in for a disappointment. A teardown and analysis of
one such cell returned lower energy density than that of the Model Y with 217
0 battery. Still, Tesla benefits from the lower per-pack price.

After a Model Y cell-to-chassis 4680 battery platform teardown that revealed i
t's nigh impossible to replace the pack's individual battery cells, now those
same cells were tested for energy density and chemical composition, confirming
the somewhat disappointing results from previous 4680 teardowns. It turns out
that Tesla's touted 4680 battery has lower energy density than the tried-and-
true 2170 cells it's been putting in its electric vehicles en masse.

The analysis returned 244 Wh/kg energy density for an almost new Model Y 4680
battery cell, compared to 269 Wh/kg for the ubiquitous Panasonic 2170 cells th
at Tesla uses in its long-range vehicles here in the US. This jibes with recen
t revelations that the main reason Tesla is using 4680 batteries at the moment
is to cut manufacturing costs, rather than any of the other pie-in-the-sky ad
vantages announced on Battery Day a few years back.

A Model Y's 4680 pack, for instance, is US$3,600 cheaper to manufacture than o
ne with 2170 cells, but even then Tesla is only halfway through with the cost
reduction potential of the new technology. It has yet to master and scale the
dry-coating cathode method which would bring the pack's cost down US$5,500 com
pared to the 2170 battery.

For now, the battery that is in the Model Y assembled in the Austin factory is
cheaper to produce than the 2170-equipped units because the larger cells allo
w for manufacturing efficiencies resulting in a lighter pack. The Tesla 4680 c
ell analysis found it to have thicker walls than its 2170 counterpart, as the
cell-to-chassis technology actually uses the cans as structural packs for the
vehicle. That's one small reason for its lower energy density, offset by using
a much thicker cathode in the 4680 cell, unfortunately still made with the sl
ower and expensive wet-coating method.

The thicker cathode only bumps the 4680 capacity by 15% compared to the one in
the 2170 cell, though, as it uses less nickel in its chemical composition. In
stead, there is more of the expensive but less efficient cobalt for reasons th
at might have to do with the recent challenges in nickel supply. The other big
reason for the superior energy density of Panasonic's 2170 cells is that they
have 10% silicon in their anode, whereas the 4680 unit has none.

All in all, however, if accounting for all those structural and chemical compo
sition differences, the 4680 and 2170 battery cells that Tesla uses have prett
y similar adjusted energy density. It's just that the 4680 is not currently li
ving up to its full potential but for its cost benefits that keep Tesla's prof
it margins intact.

Tesla may have other Model Y versions with a 4680 battery in the works, though
, as it was just granted three Certificates of Conformity for the 2023 Model Y
by the EPA. These include an AWD Model Y Long Range, as well as an AWD Model
Y Performance and an AWD Model Y, too. Let's not forget that the 4680 cell sou
rced for this analysis was produced over the summer, and the production method
s may be improved for the new 2023 Model Y versions, too.

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