Online estimation method, device and equipment for internal resistance of battery and storage medium

The invention discloses a battery internal resistance online estimation method and device, equipment and a storage medium, and the method comprises the steps: judging whether the standing time of a battery is not less than a preset standing time threshold value or not when the battery is detected to be powered on, and calculating the polarization voltage of the battery if the standing time of the battery is not less than the preset standing time threshold value; monitoring the current temperature and the charge state of the battery, determining whether the current temperature and the charge state meet a preset first battery internal resistance updating condition or not, if yes, detecting whether the current change of the battery within a preset time meets a preset second battery internal resistance updating condition or not, and meanwhile, determining a real-time battery internal resistance error based on the polarization voltage; when it is detected that the current change meets a second battery internal res