In the presence of the demand for new energy vehicle air-conditioning technology,the performance of the solenoid valve,a core component of the air-conditioning system,is the key to the stability of the system,and little research has been conducted on the structural evaluation and stress analysis of the solenoid valve,especially the bellows.A simplified model of the bellows structure was established using finite element analysis,and the influences of the bellows wave height and wall thickness on the stiffness and equivalent force of the bellows were investigated.The results show that the wave height of the bellows is negatively related to the stiffness and equivalent force,and the wall thickness is positively related to the stiffness and equivalent force.So when designing the bellows structure,the wall thickness,wave height,stiffness and equivalent force need to be considered comprehensively.Ansoft Maxwell and ANSYS Workbench software were used to establish the electromagnetic structure coupled finite element model of the bellows,and the electromagnetic force distribution of the solenoid valve was obtained by Ansoft Maxwell electromagnetic field finite element analysis,and the electromagnetic force was imported into ANSYS Workbench as a load.The main structure of the bellows was dynamically analyzed and the deformation distribution of the structure was obtained.