Patent ID: 11906594
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC G  B  H  Y | IPC B  G  H

Claim 0:
1. A method for estimating internal resistance of a secondary battery in an electric vehicle,
wherein a vehicle comprises a secondary battery, a learned neural network portion for estimating internal resistance of the secondary battery, a regenerative brake for performing regenerative charging on the secondary battery, and a charging circuit for the regenerative charging of the secondary battery,
wherein the method comprises:
performing regenerative charging of the secondary battery when a brake of the vehicle runs;
measuring data of the secondary battery while the electric vehicle is stopped with regenerative charging not running;
inputting the data of the secondary battery to the learned neural network portion; and
outputting estimated internal resistance of the secondary battery from the learned neural network portion, and

wherein the data of the secondary battery is data limited within a first time range around an end of the regenerative charging.