Thermal Runaway Mechanism of Lithium Ion Batteries
As an important technical form of electrochemical energy storage,lithium ion battery is still limited in practical application due to the possibility of thermal runaway.Therefore,it is necessary to understand the variation rule of battery temperature field after thermal runaway trigger and analyze the factors affecting temperature change.In this paper,ANSYS FLUENT is used to simulate the lithium ion battery,and the internal thermal diffusion law of the battery is studied by simulating the temperature field change of the battery under different charge and discharge fluctuation power input caused by the instability of the generator end.The thermal diffusion law is analyzed by simulating the temperature field after the thermal runaway triggered by local short circuit in lithium ion battery.The results show that the temperature and wall heat flux of the lithium-ion battery fluctuate with the input current.When triggered by local short circuit,the rate of thermal runaway extending lengthwise along the electrode is greater than that of radially spreading outwards.Increasing convective heat transfer coefficient can effectively reduce the rate and amplitude of battery temperature rise,reducing the possibility of thermal runaway of battery.The study of thermal diffusion law provides a basis for predicting thermal runaway in practical application,improving safety,and improving battery cooling technology.
lithium-ion batteriesthermal runawaysimulation of temperature fieldheat transfer model
NETL
NSTL
万方数据
维普
