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Dissecting Tesla Mannequin three’s 2170 lithium ion battery cell, what’s inside?

A teardown video featuring Tesla Model 3’s 2170 lithium-ion battery cell was recently uploaded on YouTube, showing the components of the cylindrical cell and how it stacks up against the Model S and Model X’s 18650 battery cell.

Aries RC, a channel dedicated to battery improvements in the remote control aircraft market, indicated that they acquired a 2170 lithium-ion cell from Tesla’s Gigafactory in Nevada.  The host noted that the first thing he did was to connect the battery to a resistor, in order to completely drain the cell. Next, he made a cut at the positive terminal of the battery unit to expose a plastic dielectric barrier on the cell. This barrier is utilized by Tesla as a means to prevent the jelly roll inside from physically touching the top of the battery, which would cause a short circuit. As noted by the YouTube channel’s host, the negative terminal of the 2170 lithium-ion cell also features a similar dielectric barrier.

The Model 3’s 2170 cell contains a skinny layer of insulation on its inside, which, in response to the RC fanatic, is an outer layer of fabric that protects the cell wall’s integrity throughout a thermal runaway. In situations when the lithium-ion cell does warmth up, nonetheless, Tesla has applied a security system within the type of three small cooling holes on the prime of the battery. These small holes are about zero.5 mm large, and are designed to vent out gases when the cell reaches excessive temperatures.

The jelly roll of the 2170 battery is wrapped in a copper sheet, which acts as a floor for the battery. A grounding strip can be hooked up to the copper strip utilizing faucet welding, which, in response to the YouTube channel’s host, is especially spectacular, since faucet welding is notoriously tough to perform on skinny items of metallic.

The jelly roll of the Mannequin three’s battery cell contains a lithium-nickel-cobalt-aluminum oxide that’s liable for storing power within the battery. Totally unrolled, the strip fitted with the compound measured roughly 32 inches lengthy, roughly a 3rd longer than the strip in Tesla’s 18650 battery, which is roughly 24 inches lengthy.

RELATED: Watch this Tesla Model S battery teardown performed by veteran EV modders

As might be seen in a side-by-side comparability of the jelly rolls of the 2170 and 18650 cells, Tesla’s latest kind issue 2170 cell contains a roll that’s considerably longer and thicker than the latter. General, the YouTube host recommended that Tesla appears to be correct in its estimates that the 2170 cell carries roughly 30 p.c extra cost than the 18650 lithium-ion cell within the Mannequin S and X.

Tesla makes use of 1000’s of 2170 cells to allow its mass market Lengthy Vary Mannequin three to journey as much as 310 miles on a single cost. Produced in partnership with Panasonic on the Nevada Gigafactory, Tesla’s 2170 lithium-ion battery modules proved to be one of many sources of the Mannequin three’s manufacturing bottlenecks final 12 months. As revealed by current constructing permits, nonetheless, Tesla is presently conducting large-scale improvements to the Gigafactory, aimed toward automating its battery module manufacturing line.

Other than the Mannequin three, Tesla additionally makes use of its 2170 lithium-ion cell for its Powerpack and Powerwall battery options. As confirmed by Tesla CEO Elon Musk via Twitter, nonetheless, the 2170 cells will not be making their way to the Model S and X, not less than as of writing. 

Dissecting Tesla Mannequin three’s 2170 lithium ion battery cell, what’s inside?



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