Patent ID: 7990154
Filing Date: 2011-08-02
Classification: G01R

Abstract:
1. A cell voltage detecting apparatus connected to a battery pack made up of a plurality of serially connected cell modules each of which is made up of one or more cells, for detecting a voltage between terminals of the cell module comprising: discharge type constant current circuits where any one of mutual connection points of the cell modules except both ends of the battery pack is used as a middle point, a potential of the middle point is set to a reference potential, each of the discharge type constant current circuits is provided for each of the cell modules on a higher potential side of the middle point and outputs a current representative of a voltage of the cell module; first current-voltage converter circuits each of which is provided for each of the discharge type constant current circuits and converts the current outputted from the discharge type constant current circuit to a voltage; induction type constant current circuits each of which is provided for each of the cell modules on a lower potential side of the middle point and outputs a current representative of a voltage of the cell module; and second current-voltage converter circuits each of which is provided for each of the induction type constant current circuits and converts a current outputted from the induction type constant current circuit to a voltage.