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Technology Stocks : Energy Conversion Devices
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To: Allen Bucholski who wrote (3178)2/11/1999 12:46:00 PM
From: Ray  Read Replies (1) of 8393
 
Amen, Allen. It is very good advice to closely follow the developments in competing batteries. Here is some more about the exploding Kodak batteries.

I posted the Kodak battery article on both the SI VLNC and Yahoo VLNC boards to see what those folks had to say. Here are two messages from Yahoo. The development of Manganese Oxide based electrodes is claimed by VLNC to be a major advance - there are a number of advantages in addition to the enhanced safety. I do not know if there is a conflict between the VLNC work and the Manganese Oxide technology discussed in the article just posted by you, Allen. I think VLNC has patents on their MO developments.

Universal dangers of batteries overheating
by: flatbatt (45/M) 9065 of 9069

Our best guess would be that the battery was allowed to get too hot. Usually this is a result of charging to fast.

Remember the laptops with lithium-ion liquid electrolyte batteries that had this problem? That's why the extreme caution when engineering safety features.

Now take heed of the fact that lithium polymer cobalt batteries (the choice of most of Valence's competitors, apart from ULBI and maybe Moli Energy) are very temperature sensitive. Their charging circuitry must carefully maintain their operation within a restricted temperature range.

But the Valence battery, comprised of manganese instead of cobalt, is much less temperature sensitive. The reasonable expectation is that the Valence battery will have the best safety margin of anything out there.

What remains is the final step of defining the 'safety envelope' that the charging circuitry maintains operation within. This is what the UL approval process ensures, among other things. Important? You bet it is, as your post indicates.

Kodak problem was one where
by: hopyard 9066 of 9069

the adapter socket could fail and allow charging of Alkaline batteries, a definite no-no.
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