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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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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. |
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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)
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In a 2001 Prius, if the state of charge of the batteries was sufficient, the car would run full electric mode in reverse. We tested this quite extensively one night in a parking lot and monitored current/voltage/SOC/temp. The thing that I found interesting is that I could mush on the accelerator (in reverse mind you) and get going as fast as I could, and the highest current draw from the batteries we would see was around 30A. Which isn't so amazing when you convert it to HP (~24 HP). But at he time I was green and thought WOW. There were 3 guys in the car, each weighing ~200LBS, plus our test equipment. Oh, those were the days!! |
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Replying to: redly_one (Jul 20, 2004 9:41 pm) That is a direct contradiction to everything ever published about those modules and their controlers, both technical and real-world occurences. Please back your wild claim with a detailed explanation. JOHN |
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Every battery powered device I've ever seen carries the warning not to mix battery types, and to replace all the batteries at the same time. So the Prius is different? Maybe, but unlikely. This is not to say one CANNOT replace only the bad batteries, but I doubt that the vehicle computers are programmed for this eventuality, since the variables are enormous (one variable in the total output for each battery that is new in an old stack). Most likely there would be some unusual warning messages from the computer, the severity would be based on how many old vs new, how bad the old ones are, etc. And I seriously doubt that you will ever get a Toyota engineer to say replacing some batteries in an old pack is acceptable. They will tell you to replace the whole pack... |
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Replying to: redly_one (Jul 20, 2004 9:41 pm) And I also doubt that you will ever get anyone at Toyota to say replacing some batteries in an old pack is good enough. They want all the money they can get. |
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Then look at it from this perspective: It has *ALREADY* been proven that bad modules can completely (and automatically) be ignored without any negative affect on the pack itself. Then rather than multi-state support, you would have new-only support... which is another method of module replacement without the need for the entire pack. Now you have two examples to disprove. JOHN |
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