Establishment method of battery polarization analysis model, battery polarization analysis method and device

The invention discloses an establishment method of a battery polarization analysis model and a battery polarization analysis method and device, and belongs to the technical field of batteries, and the establishment method comprises the steps: obtaining a first current and a second current of a target first resistance value, and a third current and a fourth current of a target second resistance value; obtaining a model constant according to the boundary condition; the boundary condition is determined according to the battery length, and the model constants comprise a first constant, a second constant and a third constant; and establishing a battery polarization analysis model according to the target first resistance value, the first current, the second current, the target second resistance value, the third current, the fourth current and the model constant. Therefore, the battery polarization analysis model is established according to the target battery, and when a new battery is designed, polarization analysi