Patent ID: 9142981
Filing Date: 2015-09-22
Classification: B60L,G01R,H02J,Y02T

Abstract:
1. A cell balance control unit comprising: a discharge circuit including, a series circuit of a bypass resistor and a switching element, which is connected to each of a plurality of battery cells constituting a battery in parallel; a voltage detecting circuit that detects a voltage of each of the battery cells; and a control device that performs a disconnection detection process in a disconnection detection period and performs a cell balance control in an actual discharge period, wherein as the disconnection detection process in the disconnection detection period, the control device controls all of the switching elements of the discharge circuits connected to the odd-numbered battery cells in a duty ratio and controls all of the switching elements of the discharge circuits connected to the even-numbered battery cells in an other duty ratio, and detects disconnection of wirings extracted from both ends of each battery cell based on a potential difference between the adjacent battery cells, and as the cell balance control in the actual discharge period, the control device controls each of the switching elements so that the voltage of each of the battery cells is made uniform based on voltage detection results of each of the battery cells obtained from the voltage detecting circuit.