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Congress Appropriates $1 Million for Continuing Electro Energy’s Bipolar NiMH Battery Development

Electro Energy (EEEI), a developer and manufacturer of advanced rechargeable batteries, will receive $1 million from the 2007 budget of the US Department of Defense (DOD) for continued development of its bipolar wafer-cell Nickel Metal Hydride (NiMH) battery for advanced military aircraft applications.

Michael Reed, Electro Energy’s CEO and President, stated that the ongoing DOD funding will allow Electro Energy to continue development of its patented bipolar wafer-cell technology for plug-in hybrid vehicles (PHEVs) as well as for stationary applications.

The company’s proprietary bipolar rechargeable nickel-metal hydride (BP-NiMH) battery currently powers a prototype plug-in hybrid vehicle which is an adapted Toyota Prius, developed in cooperation with the California Cars Initiative (CalCars). Electro Energy has also joined the Plug-In Hybrid Development Consortium. (Earlier post.)

The bipolar NiMH used in the EEEI Prius is a first-generation, proof-of-concept application. It is rated at 28 Ah, 6.0 kWh (180 cells), with a battery-only weight—i.e., not including controls, etc.—of 300 lbs (44 Wh/kg), giving the vehicle a projected theoretical all-electric range (AER) of more than 20 miles.

The company estimates that it will be able to deliver a final version of the PHEV bipolar NiMH battery rated at 30 Ah, 6.5 kWh (180 cells) also weighing 300 pounds (48 Wh/kg). EEEI is also developing high power lithium rechargeable batteries utilizing its proprietary bipolar design. (Earlier post.)

PHEV Battery Comparison Table
CalCars Rangea
EEEI Data courtesy of Electro Energy Inc.
aCalCars assessment based on mixed-mode driving (50% EV) range at double normal Prius gasoline mileage
b The Energy CS implementation removes the OEM battery from the Prius (70 lbs) resulting in a net weight increase of 80 lbs over OEM level.
cTheoretical rating of 6.0 kWh.
d This application assumes the removal of the OEM battery from the Prius (70 lbs) resulting in a net weight increase of 230 lbs over OEM level.
Energy CS Valence Li-Ion 9.0 150b 132 50-60
EEEI 1st-gen prototype (current demo) 6.0c
300 44 20-30
EEEI Final version NiMH 6.5 300d 48 40-50



Encouraging to see DOD back on track with NiMH. In the short term, given the right conditions, this working technology may return far more benefit than Li expectations.


Looks like a gave-away to me if the numbers are "truthiness." .5kwh improvement isn't "muchiness."
Stephen C.


Hey its still 8%. The zillion dollar question is how many more 8% improvments can you squeeze out of NiMH chemistry.


I’m guessing that the bipolar wafer-cell NiMH development could carry over to the proprietary bipolar design of the lithium batteries, as well.


Patented bi-polar technology of EEEI is method of packing of battery electrodes, separators, electrolyte, etc. into one pack. It delivers superb heat dissipation and some other advantages. Bi-polar design is especially advantageous to big batteries, like used in HEV and PHEV. Now, one could use any of available chemistries, including Ni-Mh or any Li variety. If some new exotic chemistry will appear, it could be used too.

symptoms of bipolar

ACUTE EXPOSURE- Ingestion of large amounts may result in headache, lightheadedness, dizziness, chills, fever, excitement, restlessness, nervousness, insomnia, mild delirium, hallucinations, tinnitus, constricted pupils, decreased visual fields, amblyopia,diplopia, photophobia, and scintillating scotoma. Neurologic symptoms may persist for several days…. Other effects may include alternating states of consciousness and muscle twitching, tremors, hyperesthesia, hypertonicity or hypotonicity, trismus,...

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