# New Samsung Battery Showcased: 20% Shoter, 50% Higher Capacity Than 18650 Battery

Qes
Registered Users Posts:

**5**✭
Hey people,
Check out this new article that popped up.
Samsung shows new battery back based on modules.
Link here:
https://futurism.com/samsungs-new-electric-car-batteries-boost-range-to-600-kilometers/
Second link (you can find in the first article but is more detailed):
"Samsung SDI also displayed cells and modules based on the new 21700 standard of cylindrical battery. A ‘21700’ battery is 21 millimeters in diameter and 70 millimeters in height. Its capacity is 50 percent bigger than the existing 18650 battery (18 millimeters in diameter and 65 millimeters in height). Its size is optimal for maximizing capacity, life and output simultaneously. The new battery beats batteries of any other size in light of cost competitiveness. A 21700 battery draws attention from major global manufacturers as the next-generation standard which can be applied to all sorts of products including electric vehicles, ESS and electric tools."
https://futurism.com/samsungs-new-electric-car-batteries-boost-range-to-600-kilometers/

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## Comments

325✭✭✭✭So the volume of a 18650 cell is 66,162 cubic mm (pi * 18 * 18 * 65), and the volume of a 21700 cell is 96,981 cubic mm (pi * 21 * 21 * 70). That's about 47% more volume, so yeah, it is about 50% more capacity. Doesn't seem like a breakthrough to me.

450✭✭✭✭My approach is to see how it shakes out before investing my customer's money. I prefer to let other folks test the "bleeding edge" of technology for me. (Been-there-done-that, have the T shirt)

There is a whole lot of good stuff coming very soon.

Marc

298✭✭✭Samsung has yet to begin mass production <= yawn.

Telsa is already mass producing the 21700 cell ( since June ? )

18650 cell = 250 KWH / kg

21700 cell = 300 KWH / kg

The 21700 cells do have a higher

Energy Density,they contain 20% more energy per the same weight.

Tesla says,

The only real difference between the 18650 and 21700 is increased size for more active material.

40% more active material per kg = 40% more capacity per kg

28,589admin- 1.2 * 1.2 = 1.44 more surface area (case)

- 1.2 * 1.2 * 1.2 = 1.728 more volume (active material)

However, for off grid power (homes, cabins, etc.), typically we are not too worried about volume/weight of the battery (other than initial shipment/installation issues)--So if the cell is "more expensive" per kWH of storage, it is not really "interesting" for off grid use even if smaller/more dense than other designs.-Bill

2,085✭✭✭✭mostsolar applications. Lithium is darned expensive and life tends to realize significant changes within 15 years. Such as moves...Sometimes they juice up the specific gravity and call it a high performance battery sold for more money. Since that decreases the longevity, it is misleading in some ways.

298✭✭✭( He incorrectly used "diameter squared" vs "radius squared" but for the ratio of the volumes, it does not matter )

The 21700 cell is

1.47 timeslarger volume, not 1.728 larger as you claim, vs the 18650 cell - which relates to mAH capacity.They increased the battery volume by ~47% ( not ~73% ) and so 21700 has roughly 50% more mAH capacity vs 18650.

In my message #4, I discussed

Energy Density( mAH per kg ) - not mAH capacity.They have also increased the Energy Density by 20% - ie now weighs less per same mAH capacity

I am very concerned with both weight and volume.

A 48 Volt 17 KWhr Lead Acid Battery Bank 30% DOD 7 year ( if you are lucky ) system consisting of ...

24 @ Trojan L16RE-2V batteries = 16' long shelf and it weighs

2,800 lbs!$9,360 = $390 x 24 batteries

Now add $ for a 48 Volt 100 Amp 3-Stage Charge Controller, with EQ mode

Now add $ for a 5KW DC-to-AC Inverter

And you have to maintain the electrolyte every month for life, otherwise they will fail early.

You are "married" to this battery bank - hydrometer readings, EQ cycles, distilled water, etc ...

The Power Wall 2 is 14 KWHr, 2' W x 4' H x 6" D wall hung, 276 lbs with a 8 - 10 year guarantee

$8,000 - includes AC Inverter and DC Charge Controller

Someone needs to find a mistake in the above information,

otherwise I see no advantage using Lead Acid Batteries vs Lithium Batteries.

28,589admin-Bill

1,233✭✭✭✭Energy densityis the amount of energy stored in a given system or region of space per unit volume. Colloquially it may also be used for energy per unit mass, though the accurate term for this is specific energy.I am available for custom hardware/firmware development

298✭✭✭547✭✭✭✭