Simultaneous Reconstruction of Heat Source Field and Temperature Field in Lithium Ion Battery Based on Extended State Space Model
The internal heat generation mechanism of lithium-ion batteries is very complex,and it is difficult to describe the spatial distribution of heat generation in theory.In this paper,a simul-taneous reconstruction scheme of 3d internal heat source field and temperature field in lithium-ion battery is proposed.According to the basic equation of heat transfer process of lithium-ion battery,the corresponding state space model is established.Furthermore,the extended state space model with the internal heat source field and temperature field as joint state vectors is obtained by state space expansion.Finally,Kalman filter is applied to realize the simultaneous 3d reconstruction of internal heat source field and temperature field.The three-dimensional internal heat source field and temperature field of the charging and discharging process of lithium-ion battery were reconstructed by numerical experiments,and the influence of the number of temperature measuring points,ambient temperature and measurement error on the reconstruction results is discussed.
lithium-ion batterytemperature fieldreconstructionextended state space modelkalman filter
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