Secondary battery, secondary battery inspection apparatus and method, and battery inspection system

摘要

A plurality of detection units (DU(1)-DU(n)) are connected respectively in parallel with a plurality of battery cells (BC(1)-BC(n)) connected in series. The detection units (DU) each include an inductor (42) and a zener diode (45) connected in series. A battery checker (50) includes a plurality of detection inductors (52(1)-52(n)) and a single voltmeter (55) that form a closed circuit. A plurality of detection inductors (52(1)-52(n)) are arranged so that they are magnetically coupled respectively with the inductors (42(1)-42(n)) of the plurality of detection units. Each zener diode (45) is connected with the polarity to be reverse biased by the output voltage of the battery cell (BC). Respective breakdown voltages (Vz(1)-Vz(n)) of the zener diodes (45) are set higher than the output voltage of each battery cell (BC) in normal use and different in a stepwise manner from each other.