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Hybrid Vehicles The Great Hybrid Battery Debate
669 messages, Last post on Apr 06, 2009 at 2:32 PM
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No, the Prius doesn't push the envelope in battery technology; it just makes sure the batteries don't get over charged or fully depleted. Nothing new there. It uses the plain old batteries, several years old technology... |
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Replying to: stevedebi (Jul 26, 2004 9:10 am) The NiMH itself within the Prius battery-pack is record-breaking "technology". The energy-density is significantly higher than just "plain old batteries". Other NiMH simply cannot compare. JOHN |
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Replying to: john1701a (Jul 26, 2004 9:19 am) Do you have data to back up your "energy density" statement? |
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Replying to: stevedebi (Jul 26, 2004 1:24 pm) JOHN |
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Replying to: stevedebi (Jul 26, 2004 1:24 pm) The battery-pack was reduced by 11 modules (from 39 to 28) with the 2004, yet it now delivers even more power than the 2003. JOHN |
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Replying to: stevedebi (Jul 26, 2004 9:10 am) Some hybrids like Civic Hybrid and Escape Hybrid are still using Cylindrical D-shape NiMH batteries. The graph I posted above shows that Internal Resistance is very high compare to the first generation of Prismatic NiMH. Second generation Prismatic used in 04 Prius is a couple of generation ahead of cylindrical model. See the inner working of both types and you might want to rethink about your "Nothing new there" comment.  This following information is for the first generation of Prismatic NiMH used in the classic Prius; from The Society of Automotive Engineers, written by Electric & Hybrid Vehicle Engineering Div. of Toyota Motor Corporation. "The case is made of plastic, which was selected based on its resistance to the alkaline electrolyte, electrical insulation between cells, formability of the modular shape, weight, etc. The rectangular modules, when combined into a battery pack, reduced dead space and require a minimum amount of space for cooling. Thus, a compact package has been realized." "To ensure electrical safety, the component parts of the high-voltage system are enclosed in the battery pack, ..... These parts consist of a system main relay (SMR) with a built-in current sensor, a service plug with a built-in fuse, and a battery electronic control unit (ECU)." "It(SMR) functions(cuts off the high-voltage system) similarly when the vehicle is involved in a collision or when there is a malfunction in the system." "The current sensor is used for calculating the state of charge (SOC) of the battery. " "The fuse prevents electric shocks and fire in the vehicle when the battery short-circuits, such as in the case of a collision." "Based on the current, voltage, and the temperature of the battery, the battery ECU calculates the SOC and transmits it to the vehicle control system. It also monitors the battery for abnormalities." Information from Panasonic about 2nd gen Prismatic NiMH used in 04 Prius: "High power battery module for HEV application (30% more power than conventional prismatic battery) Newly developed battery has high power of 1300W/kg, 1.3 times higher than our conventional prismatic battery, and energy density of 46Wh/kg. By adopting new electrode materials and newly developed cell connection structure, internal resistance could be reduced, and more higher reliabilities on likely long life characteristic are improved due to the improvements of cell stack construction etc." Dennis |
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Replying to: stevedebi (Jul 26, 2004 1:24 pm) I'll point you to Panasonic website that have all the information that you'll need. See which hybrid used which type of NiMH: http://www.peve.panasonic.co.jp/e_news.html See spec of 1st gen and 2nd gen prismatic NiMH: http://www.peve.panasonic.co.jp/catalog/e_kaku.html Spec of Cylindrical NiMH: http://www.peve.panasonic.co.jp/catalog/e_maru.html Battery catalog page with more links: http://www.peve.panasonic.co.jp/e_catalog1.html Dennis
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Replying to: usbseawolf2000 (Jul 26, 2004 1:47 pm) |
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Well, I stand corrected. Thanks for the updates... Very useful to have these boards... |
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quote MidCow:-"The current fear is the unknown life-span of the traction batteries."-end quote Lots of good points MidCow, you have a good grasp of the situation. Leading to a "BUT:" I'm not sure where you might be getting the indications of this being an actual FEAR that might be preventing Hybrid purchases...?....?...? So far we have true stories of Priuses going 150K miles and being bought back by Toyota for evaluation... We have 1997 model year Priuses on the road in Japan... We have warranties of 8 yr/100,000 miles on the batteries in some hybrids.... Is there ANYWHERE a story of ONE SINGLE potential Hybrid buyer telling the salesperson, "Well, I love everything about the car, but that darn uncertainty about the life of the battery is just KILLING the deal !!" I don't think we have any of that. Even if we DO have a few isloated incidences of that happening, I cannot for a second believe that it has ANYTHING AT ALL to do with the acceptance of Hybrids to the mainstream buyer... Anyone have any evidence to support that fear? |
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