Edmunds.com | Inside Line | Auto Observer Your Account | Help | Directory
You are here:
![[F]](http://a332.g.akamai.net/f/332/936/12h/www.edmunds.com/media/townhall/webxicons/site.gif){kind=small}
Forums
Hybrid Vehicles The Great Hybrid Battery Debate
669 messages, Last post on Apr 06, 2009 at 2:32 PM
You are in the Hybrid Vehicles Forum. Your Host is pf_flyer
|
Replying to: usbseawolf2000 (Jul 11, 2004 6:20 pm) |
|
Why must NiMH batteries have 1.2V?
|
|
|
|
|
Replying to: robertsmx (Jul 12, 2004 5:56 pm) Because of the chemstry of the battery. The voltage varies with the state of charge of the battery but nominal voltage is commly accepted as 1.2 volts. Dennis |
|
|
Replying to: robertsmx (Jul 12, 2004 5:56 pm) |
|
| Thanks both. Didn't know that, although I always wondered. I also know that the discharge characteristic is different from a typical alkaline battery (sustains voltage instead of losing it during the discharge). What limits the voltage though? In other words, a 9V NiMH battery isn't really a 9V battery (7-odd volts?), but what is the limiting factor? | |
|
|
|
Replying to: robertsmx (Jul 12, 2004 7:22 pm) Most 9V NiMH provide 8.4V. There are 7 1.2V cells connected in parallel. Some 9V NiMH use 8 cells to provide 9.6 volts. The trade off is in the capacity or the mAH. The battery that will be in Highlander hybrid or RX400h is said to have twice the power of Prius. It is not clear if it will have 403.2 volts with 6.5 AH or 201.6 volts with 13 AH. If you think electricity flow as a water pipe. The volt is how wide the pipe is and Amp per hour is how fast the water flows. Dennis
|
|
|
TODAY/Tuesday 3-4pm EST noon-1pm PST Hybrid Chat Room |
|
|
Replying to: usbseawolf2000 (Jul 12, 2004 8:00 pm) Second, in your analogy, voltage would be the pressure accross the pipe while the diameter of the pipe is analogous to the impedance of the circuit. Current (amperes) is analogous to the rate of flow. In your reference to "amps per hour" I assume that you mean Ampere Hours which is the integral of current over time and is a measure of the energy delivered (at a particular voltage). Note that 1 amp for 10 hours is 10 AH, but only 1A per hour. You may be confusing battery capacity (AH) with discharge rate which is also important to a battery's rating since capacity will usually decline at high dicharge rates. |
|
|
Be sure to check out our Town Hall chat lineup for Tuesdays... First up, talk the latest in new automotive technology during the Hybrid Vehicles Chat from 12-1pmPT/3-4pm ET NOTE: This is a NEW time slot for this week! Hybrid Vehicles Chat Room Immediately following at 6-7pm PT/9-10pm ET, we keep the chat party going with the Mazda Mania chat. Mazda Mania Chat Room The Town Hall chats are a great place to take these message board topics LIVE. Hope to see you there this week! PF Flyer Host Pickups & News & Views Message Boards |
|
|
Replying to: midnightcowboy (Jul 07, 2004 10:38 am) If you stick a new module in with a bunch of dated modules, the results are bad. The old modules lose capacity over time, so their charge/discharge cycle is going to be far different from a new module. Not to mention how the algorithms in the BCM (Battery control module) will be farked up by adding a new module to an old pack.... Just to clarify...when one module goes bad in a Prius HV battery pack, you will need to replace the entire pack. FWIW, I have tested modules from Prius battery packs (2001 and 2002)
|
|
You are here:
Forums
Hybrid Vehicles The Great Hybrid Battery Debate
New? Join Now!
Forum Tools
Search Forums
Browse by Vehicle
Browse by Board
Browse by Topic
Today's Chats
