Polypore Signs Separator Deal With Panasonic For Next-Gen Cylindrical Lithium-Ion Battery

DEC 16 2014 BY MARK KANE 15

Panasonic 18650 High Capacity Lithium Batteries

Panasonic 18650 High Capacity Lithium Batteries

Panasonic and Polypore’s Celgard subsidiary have signed a letter of intent to work together in the development of coated and uncoated Celgard brand separators for next generation lithium-ion batteries (cylindrical).

It’s expected that shortly after the development process is completed, the parties will enter into a long-term supply agreement.

As we don’t know any details, we just hope that there is some potential for further improvements in cylindrical batteries to have even longer range electric cars.

Robert B. Toth, President and Chief Executive Officer of Polypore stated:

“We are very pleased to have the opportunity to work closely with an industry leader such as Panasonic on this development initiative and to further solidify our partnership with them. It demonstrates the commitment of both of our companies to improve lithium-ion battery technology and meet ever-increasing demands in high performance applications. Together we are well positioned to meet future market demands and growth.”

Dr. Munehisa Ikoma, Senior Executive Engineer, of Panasonic AIS Company commented:

“We are taking this step because we know Polypore is the leader in developing and manufacturing highly-functioning lithium-ion battery separators. Polypore will be a valuable partner because they are capable of meeting technology and capacity needs in support of Panasonic’s future growth globally.”

Categories: Battery Tech, Tesla

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15 Comments on "Polypore Signs Separator Deal With Panasonic For Next-Gen Cylindrical Lithium-Ion Battery"

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Wondering if the real delays for the Model X, are TMC trying to cram as much energy density into their first tow-rated crossover…

Perhaps there will be a 95 – 105 or so, kWh battery option with the heavier vehicle? Perhaps these subtle updates to the 18650’s might allow for this to happen more economically?

Jouni Valkonen

Tesla has hinted in several occassions that they will expect longer range Model S (and X) perhaps as early as in 2015. Some have speculated 115 kWh version. Not sure about exact capacity, but definitely Tesla expects some improvement in energy density in very near future. In 2015 or 2016.

If they can keep the cell count roughly the same as with 85 kWh version, and boost the capacity over 100 kWh, it is probably then game over for ICE cars in luxury car markets.

For reminder, Toyota’s luxury brand Lexus generates about 50 % of all profit that the biggest car manufacturer in the world generates. Therefore electrification of luxury car markets is not small issue for the profitability of ICE car business.

Francis L

I’m asking myself : would it really helps to get more range in a Tesla? Is there really that much people that can but won’t buy a Tesla because of the range? With more and more superchargers, it seems to me that range is less and less important.


Your comment is valid but only starting from a threshold somewhere around 400 miles that has not been reached yet. So the energy content has to increase to 120 KWh or 130 KWh before extra energy becomes less interesting.

Dave K.

The current range of the Tesla S is fine for practical purposes, the problem is psychological, there will always be someone who says “but what if I want to go a little further?”, people don’t really buy cars for practical reasons.

Jouni Valkonen
It is fun to watch that current generation batteries are only one step behind parity what is needed for solar and wind power storage and replacement of oil in passenger and heavy transporation. And it is just foolish to think that the next generation of batteries will never materialize. Although this it is foolish to think that the progress of technology stops today, many people have invested countless of billions of dollars pension savings into direct or indirect oil industry and even more importantly on traditional grid utility companies. And it goes without saying that these assets will lose their value very soon. In matter of few years. My guestimate is that in five years, oil companies and grid utility companies have lost about 90 % of their value. This just happens and there is no stopping for it. Anyone who is even remotely familiar with the grid and transportation technology understands this, but very few cannot still believe how steep and how rapid the collapse will be. It takes less than decade. Therefore if you ask me, we have only seen prelude as oil price has sunk below 60 dollars per barrel. But in few year it will sink… Read more »
Ocean Railroader

It is physically impossible for oil prices to drop to $20. In that when Oil hits $40 to $50 dollars a barrel a lot of oil producers using expensive methods to pump oil out of the ground will put their oil fields into sleep mode. When they put their oil fields into sleep mode they are waiting for oil prices to go back up again. But when they put it into sleep mode they oil cut back oil production and oil prices will rise back up again to at least $60.

Another 900 pound Gorilla in all of this is how much would peak oil jump into this. In that we could be swimming in cheap oil now but three to five years from now it could be back up to $5.00 a gallon.

As for the power companies I don’t think they are going to go away in that there are a lot of industrial users along with modern Data Centers that require monstrous amounts of power to keep them running. And as the digital needs keep rising we are going to get more and more huge energy hungry data centers to keep the internet running.


I didn’t think there was much technology to the separator or room to improve performance. It’s just the cheapest, non-electrically conductive, porous material you can find. Don’t most batteries just use carbonized plant material?

Unless it’s a solid state battery and is the separator/electrolyte. Not saying that’s the case here.


Perhaps it could improve the efficiency? That might allow faster charge and discharge rates, since it reduces the heating of a battery.


“Separator”, is it a dry electrolyte they are talking about? Solid state battery?

Dave R

Separators are used with liquid electrolyte. It keeps the anode and cathode from shorting out. They are typically designed to melt solid once a critical temperature is exceeded to help minimize thermal runaway. They are a critical safety feature in lithium batteries.


I see, so this deal is not likely to be a significant improvement in capacity then? I guess safer batterier is a win too.


Interesting, since Polypore *was* making the batteries for the Leaf.


Polypore only makes the separators, not batteries. Doesn’t assemble them either.

Josh Bryant

Hmm, GigaFactory partner?