ASSEMBLED BATTERY MODULE AND DISCONNECTION DETECTING METHOD

摘要

An assembled battery module includes battery cells connected in series, resistors, a voltage measuring unit, failure detection switches, and a control unit. Each resistor is connected between a positive or negative electrode of the corresponding battery cell and a corresponding node for the positive or negative electrode. Each failure detection switch is connected between the two nodes corresponding to positive and negative electrodes of a battery cell to allow on-off switching between the two nodes. The control unit detects a disconnection between a positive or negative electrode of a battery cell to a corresponding node based on first and second voltages measured between two nodes, the first voltage being measured when one of the two failure detection switches connected to the corresponding node is switched from on to off and the second voltage being measured when the other failure detection switch is switched from on to off.

主权项

1. An assembled battery module, comprising:
a plurality of battery cells connected in series; a plurality of resistors each of which is connected between a positive or negative electrode of a corresponding battery cell, and a corresponding node for the positive or negative electrode; a multiplexer configured to select two nodes corresponding to the positive electrode and the negative electrode of any one of the battery cells; a voltage measuring unit configured to measure the voltage between the two nodes selected by the multiplexer; a plurality of failure detection switches each of which is connected between two nodes corresponding to the positive electrode and the negative electrode of one of the battery cells to allow on-off switching between the two nodes; a control unit configured to detect a disconnection between a positive or negative electrode of one of the battery cells and a corresponding node for the positive or negative electrode based on first and second voltages measured between the corresponding node and either a first node that is connected to the corresponding node through a first failure detection switch or a second node that is connected to the corresponding node through a second failure detection switch, the first voltage being measured when the second failure detection switch is switched from on to off and the second voltage being measured when the first failure detection switch is switched from on to off.