METHOD FOR JUDGING STATE OF SECONDARY CELL AND DEVICE FOR JUDGING STATE THEREOF, AND METHOD FOR REGENERATING SECONDARY CELL

摘要

The internal resistance associated value associated with the internal resistance of a secondary cell is collated with the correspondence relationship grasped in advance between the internal resistance associated value and the cell state by a predetermined method, and thereby the cell state of the secondary cell is judged. Since the internal resistance associated value is a value associated with the internal resistance which is in a close relationship with the cell state, the cell state is judged precisely from the relationship. The internal resistance associated value is found out by a predetermined method in a short time. If the degradation of the negative plate is low, only the electrolyte is supplied; if the degradation is high, a reducing agent is added to the electrolyte so as to regenerate the cell. By such a regenerating method, the performance of the negative plate can be restored without degrading the positive plate.