Thermal safety remains a critical challenge for lithium-ion batteries (LIBs) in electric vehicles and energy storage systems

especially under extreme temperatures. Existing thermal models often fail to adequately capture the coupled effects of internal non-uniform heat generation and environmental thermal loads.In this paper

a battery thermal management design method based on electro-thermal coupling modeling and multi-parameter collaborative optimization is proposed.By integrating COMSOL Multiphysics multi-physics field simulation and MATLAB optimization algorithms

a numerical model that can accurately describe the non-uniform heat generation and heat dissipation characteristics of the battery is established. It comprehensively considers multiple physical source terms and actual heat dissipation boundary conditions

and uses linear stretch mapping to achieve equivalent flattening modeling of the winding structure

balancing computational efficiency and accuracy.Experimental and optimization results show that there is a significant current and heat aggregation effect in the electrode tab area

which clearly identifies this area as the core sensitive region for thermal management. Further research reveals that low-temperature conditions (-10°C) can lead to intensified internal temperature rise and deteriorated temperature distribution in the battery

which poses an important need for revision of traditional thermal management strategies. Ultimately

the key thermal parameters obtained through multi-objective optimization exhibit good robustness and can be used for accurate prediction of battery thermal behavior under different operating conditions.