Thermal Runaway

This forum has been developed to discuss maintenance topics in Canada.

Moderators: ahramin, sky's the limit, sepia, Sulako, North Shore

Post Reply
Message
Author
mr.blue
Rank 0
Rank 0
Posts: 7
Joined: Sun May 02, 2004 5:14 pm

Thermal Runaway

#1 Post by mr.blue » Sun May 16, 2004 2:26 pm

What is this? Does it happen in Ni-Cad batteries?
---------- ADS -----------

ahramin
Rank Moderator
Rank Moderator
Posts: 5372
Joined: Tue Feb 17, 2004 5:21 pm
Location: Vancouver

#2 Post by ahramin » Sun May 16, 2004 3:21 pm

A battery has an internal resistance. This resistance changes with temperature.

A battery works by chemical reactions. Some of these reactions occurr even when the battery is not connected.

If a battery is damaged, the most likely scenario coming from overcharging the battery, it can heat up to the point that the internal resistance of the battery is so low that it turns into a positive feedback problem wherein the heat causes more chemical reactions, which cause more heat, which is called a thermal runaway.

A NiCd in this situation will explode before it breaks.
---------- ADS -----------

Post Reply

Return to “Maintenance”