Secondary Batteries: Lead Acid Battery Thermal Runaway

摘要: Abstract : The thermal runaway effect observed in sealed lead acid batteries is reviewed and reassessed as a means for understanding the at more fundamental level. It to be noted that popular explanation heat generated when cell overcharged oxygen recombination taking place negative electrode an exothermic process. Although it fact this reaction exothermic, first law of thermodynamics mandates net enthalpy closed cycle process exactly zero (also known Hess's Law). Since cannot produce any enthalpic heat, must entirely Joule origin. In view apparent dilemma, alternative mechanism developed discussed gas evolution displaces electrolyte intercell gap. By doing that, displacement causes substantial increase internal resistance cell. consequence presence current passing through significant contributor generation. This paper presents data discussions support interpretation. mechanistic interpretation has some notable implications. That is, generation largely chemistry independent (i.e., common all designs), ability separator manage distribution within can thermally accelerate thermodynamically spontaneous processes have slow kinetics under normal ambient conditions. To add additional credibility interpretation, analysis takes lithium ion cells attempted by building on model runaway.