Voltage monitoring module and voltage monitoring system

摘要

A voltage monitoring module includes voltage control circuits each connected between two adjacent input terminals and causing a current to flow to generate a voltage drop when a voltage of a k-th input terminal counted from a high potential side is higher than a voltage of a (k−1)-th input terminal; and a disconnection detection circuit that detects a disconnection between battery cells and m input terminals. The disconnection detection circuit includes an activation circuit that controls a flow of m currents flowing between the m input terminals and a ground terminal; (m−1) first switches having one end connected to each of second to m-th input terminals, and a control terminal connected to each of first to (m−1)-th input terminals, and turning on when a voltage applied to the control terminal is smaller than a predetermined value; and a memory unit connected to another end of the (m−1) first switches.

主权项

1. A voltage monitoring module comprising:
m (m is an integer equal to or greater than 2) input terminals respectively connected to high-potential-side terminals of m battery cells connected in series; a ground terminal that receives a voltage of a low-potential-side terminal of a lowermost battery cell of the m battery cells; (m−1) voltage control circuits that are each connected between two adjacent input terminals of the m input terminals and cause a current to flow to generate a predetermined voltage drop when a voltage of a k-th (k is an integer equal to or greater than 2 and equal to or less than m) input terminal counted from a high potential side is higher than a voltage of a (k−1)-th input terminal counted from the high potential side; and a disconnection detection circuit that detects a disconnection between each of the high-potential-side terminals of the m battery cells connected in series and each of the m input terminals, wherein the disconnection detection circuit comprises:
an activation circuit that is disposed between the m input terminals and the ground terminal and controls a flow of m currents flowing between each of the m input terminals and the ground terminal;(m−1) first switches having first terminals respectively connected to the second to m-th input terminals counted from the high potential side; second terminals that output signals; and control terminals respectively connected to the first to (m−1)-th input terminals counted from the high potential side, the (m−1) first switches being configured to turn on when a voltage applied to the control terminals is smaller than a predetermined value; anda memory unit connected to each of the second terminals of the (m−1) first switches.