Patent ID: 9128138
Filing Date: 2015-09-08
Classification: G01R,H02J,Y02E,Y02T

Abstract:
1. An electrical storage system comprising: a plurality of serially connected electrical storage blocks each including at least one electrical storage element connected to a load and configured to be charged or discharged; a voltage detection circuit connected to each of the electrical storage blocks via corresponding voltage detection lines and configured to detect a voltage of each of the electrical storage blocks; a protection circuit including an overvoltage protection element connected in parallel with each of the electrical storage blocks via the corresponding voltage detection lines and a first resistor connected in series with the overvoltage protection element, and the protection circuit being provided in correspondence with each of the electrical storage blocks; a discharge circuit connected in parallel with each of the overvoltage protection elements via the corresponding voltage detection lines and connected in series with the first resistor, the discharge circuit including a second resistor having a larger resistance value than the first resistor; and a controller configured to compare a voltage between the electrical storage blocks using the detected voltages of the corresponding voltage detection circuits and detect an abnormality in the overvoltage protection elements, wherein the controller is configured to detect an abnormality in the overvoltage protection elements by, in a state where the electrical storage elements are not connected to the load, comparing a voltage of a first electrical storage block among the electrical storage blocks, which is placed in a discharged state where current is caused to flow through the corresponding second resistor by activating the corresponding discharge circuit, with a voltage of a second electrical storage block among the electrical storage blocks, which is not placed in the discharged state caused by activating the corresponding discharge circuit.