Kokam Launches New Liquid-Cooled, 150 Wh/kg Battery Pack, Scalable Up To 1.5 MWh

MAR 16 2017 BY MARK KANE 25

Kokam EV Battery – XPAND

So you want a bigger lithium-ion battery in your next EV?  Kokam has you covered, and has introduced it XPAND battery pack system.

Although its not intended for your typical passenger EV (think buses, trucks, commercial grade equipment), the latest generation of its XPAND battery packs can pretty much accommodate any EV, and includes “advanced liquid cooling”, and a energy density of 150 Wh/kg.

The XPAND batteries start from a capacity of 7.1 kWh (XMP71P) and 11.4 kWh (XMP114E), but can stack up to 1.5 MWh systems…which would give you about 4,000 miles of range if you stuffed them all into the back of the new Renault Master ZE commercial van.

Oh, you know you want to fill that new Renault electric van up with batteries and do a range test!

Specs available here.

Noteworthy is that Kokam’s fully automated manufacturing facility for those batteries (cells and packs) is located in the U.S., and already has a capacity of 700 MWh annually.

“The result of four years of extensive R&D and product development efforts, the new XPAND battery pack features advanced battery technologies that meet or exceed practically all existing standards for EV battery safety. For example, the battery cells’ ceramic separator and other battery pack thermal containment technologies prevent thermal runaway propagation.

These and other advanced battery technologies enabled the XPAND battery pack to secure an IP67 rating, confirming that it is fully protected from dust and can be submerged in 1 meter of water for up to 30 minutes. In addition, the XPAND battery pack has been developed according to ISO 12405, ECE R100, J2929, and ISO 26262 standards and is UN38.3 certified.

The XPAND pack also provides a high-level of cost-effective performance to the EV market. The XPAND’s advanced liquid cooling system offers direct cooling to the battery cells’ face, maximizing volumetric efficiency by reducing the mass of the system by up to 75% compared to air-cooled systems. These and other advanced battery technologies allow the XPAND battery pack to achieve an energy density of up to 150 watt hours per kilogram (Wh/kg).

Kokam EV Battery – XPAND

The XMP71P battery pack’s 40Ah Lithium Nickel Manganese Cobalt (NMC) Oxide cells have a long lifespan with cycle lives of more than 6,000 cycles. XPAND’s modular “plug-and-play” design, with all external connections on the front panel, makes it easy to engineer XPAND into a wide variety of EV applications and service the battery pack in the field.

XPAND’s battery management system (BMS) features diagnostics, battery state estimate and a flexible system architecture, providing more accurate State of Charge (SOC) and State of Health (SOH) data, helping EV operators more accurately estimate how long they can continue to drive their EV before recharging.

The battery system has been tested to meet the strict electromagnetic compatibility (EMC) requirements of international marine and transportation customers in North America, Europe, and Asia.”

“Kokam Co., Ltd has provided a wide range of lithium ion/polymer battery solutions to customers in over 50 countries and many different industries, including the military, aerospace, marine, Electric Vehicle (EV), Energy Storage System (ESS) and industrial markets. Kokam has more than 150 battery-related patents and a total of 650-megawatt hours of field performance.”

source: Green Car Congress

Categories: Battery Tech


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25 Comments on "Kokam Launches New Liquid-Cooled, 150 Wh/kg Battery Pack, Scalable Up To 1.5 MWh"

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George Bower

How does the energy density compare with Tesla. Note that Kokam cell were chosen for solar impulse where wt means everything. Also note they are prismatics.

The numbres for energy density are for the pack. I think tesla cells are around 260 wh/kg….but thats cell level not pack.

Anyone know the pack energy density of Teslas latest cell at the pack level in a P100D?


I see Tesla’s battery pack quoted as 140 Wh/kg. The P100 might be a bit higher and the Model 3 more so. These look to be about the same. Kokam’s cycle life looks good, probably higher than Tesla’s, though I haven’t seen anything published on that for a while.


The latest Tesla 100 kWh pack is roughly 178 Wh/kg, with 18650 cells.


150 is far from impressive though…


No pricing info, case closed!

Robert Weekley

And the 100 Ah cells were the ones that ProEV settled on as they helped win their first Road Race. See details at http://www.proev.com

Seems like these modules are a good option for EV Shool Bus choices!

Rob Stark

Does Kokam manufacture cells or do they just assemble cells made by others into their own packs?


I’m not an expert at batteries but a quick google seems to indicate they are making the cells and Dow is or was involved.


DOE was involved in funding,
BTW Arpa-e just got destroyed by Rump.


Hat tip to you, Tom. Excellent reference. Bookmarked as a benchmark.


70% capacity after 10k cycles!?

That’s 1.8 million miles for a pack similar to the bolt.


Compare that to NCA …. heh.
Also compare that to today’s NMC varieties too.

10k cells @ 70% is fantastic and can only be beat by the likes of LTO cells (Lithium Titanate) which is used for buses due to fast-charging and very high cycle counts.


How can I fit a couple of these XPAND 7.1 kWh bateries into the trunk of my 2016 Leaf 30kWh? I could use the 50 mile extra range without having to spend another $15K and get a GM Bolt. These XPAND batteries could run my boats trolling motor when I am not Leafing around on the road.


Let me know when you get a quote.

One of the things that made so many EV skeptics more skeptical is the retail price of batteries. We never saw (and still aren’t seeing) the benefit flowing down to the small-lot buyer. If you manage to find LEGIT higher-end LG or Samsung 18650s they cost $5-6 each or more; Panasonics are not to be found (beware the fakes).

Recently I built a nice e-boosted kick scooter and spent nearly a divorce-worthy amount to build my 36v/10Ah pack. I guess she thought I learned my lesson on the $900 trolling motor battery… (and I never told her about the BMS).

Jake Brake

Wow, at those prices i would make a killing selling legit 2170s.

Jake Brake

I dont mean to be too critical but thats a module with an enclosure, not a pack so they are being a bit creative with marketing. Also, isnt that 40Ah cell like 8-10 year old technology now? Last i checked it was a phev chemistry which os why it has higher cycle life and lower energy density. BEV cells are 240wh/kg+ these days.


This might be off topic but did anyone know Bob Lutz is making an electric pickup truck? Look at the neat power outlet stuff. Very very useful for construction sites and places like that.


Mark Hovis

Via has its own tab on this site. Our local utility company in NC has bought a few. Corner Jay and he will give you the real skinny on what is going on with Via Motors.

Bob A

Jay, it has been a while since an article on VIA showed up on Inside EV. Could you update us with what you know?

Jay Cole

Story short is (as we understand it):

VIA had enough seed money to start/launch a product in ~2012/2013, but lacked capital to fund real production (as promised originally in 2013), I guess there was some hope the hype on the truck would lead to further significant investment.

…since the debut, they have been attempting to fund raise for production, and it appears using the money they do raise to pay to keep the lights on.

There has been some limited govt/fleet builds (but only as tied in with huge subsidies/guaranteed contracts). The issue now (besides the continued lack of investment) of course is that the OEMs are slowly being dragged into building non-compact car plug-ins…so the window for an aftermarket truck converter to find success is shrinking fast.


Can you just call Mary Barra at GM and tell her to jam those Bolt packs into their larger vehicles and “get moving” on what is inevitable? An electric pickup truck would be a good seller, if not great. They just can’t figure out how to make it profitably.


Too bad they don’t make an aftermarket pack for the first generation Nissan Leaf…there’s 270,000 plus out there who will be coming due for a battery replacement continuously over the next 20 years.


I have some hopes that Kreisel will make a pack if Leaf 2 comes out and Leaf 1 will not get any pack upgrades.


Software is the hardest part. You would need to hack the ECU too.