The present invention relates to an apparatus and a method capable of calculating insulation resistances and parasitic capacitances of a battery outside the battery. In the present invention, when a positive electrode connector and a negative electrode connector are coupled to a positive electrode terminal and a negative electrode terminal of the battery, respectively, and a ground connector is coupled to a case of the battery, even though the battery is positioned inside a chamber in order to perform a temperature test or the like of the battery, the insulation resistances and the parasitic capacitances of the battery may be calculated without needing to move the battery to the outside of the chamber. Accordingly, the insulation resistances and the parasitic capacitances of the battery may be conveniently calculated.

A method for determining the resistive component of the leakage current impedance (R.sub.i50) of a downstream branch to an alternating current network having a live phase (L), a neutral conductor (N), and a protective conductor (PE) conducted by: (a) measuring a differential current I.sub.LN between the live phase (L) and the neutral conductor (N); (b) measuring a voltage U between the live phase (L) and the neutral conductor (N) or between the live phase (L) and the protective conductor (PE); (c) correcting a phase shift between the differential current I.sub.LN and the voltage U; (d) determining several individual differential current values I.sub.LN,i and several individual voltage values U.sub.i, the differential current values I.sub.LN,i being phase-corrected with respect to the voltage values U.sub.i; (e) determining the effective power P from the several individual differential current values I.sub.LN,I and the several individual voltage values U.sub.i; (f) determining the effective voltage U.sub.Eff by the voltage values U.sub.i; and (g) determining the resistive component of the leakage current impedance (R.sub.i50).

An apparatus and a method for measuring an insulation resistance of a vehicle provided with a high voltage system including a battery and a plurality of high voltage electrical components operated by receiving power stored in the battery, includes a controller configured to determine a stray capacitance based on the high voltage electrical components electrically connected to the battery and to determine a measurement period for measuring the insulation resistance of the vehicle based on the determined stray capacitance.

An insulation monitoring method and system for a traction battery and an apparatus are proposed to solve the problem of how to accurately predict a risk of insulation deterioration of the traction battery before the insulation deterioration occurs on the traction battery, so as to provide an early warning about failures in the traction battery. In this method, data statistics on a large amount of insulation resistance values within a long period of time are collected, and whether the traction battery has the risk of insulation deterioration is determined by analysis based on a data statistical result; and if the traction battery has the risk of insulation deterioration, alarm information is output. In this method, based on data statistical analysis performed on the large amount of insulation resistance values within a long period of time, insulation deterioration can be predicted before the insulation deterioration occurs on the traction battery. This allows a user to perform battery maintenance in time before the insulation deterioration occurs on the traction battery, so as to prevent traction battery failures.

An interactive test equipment for quality evaluation of an insulative electric resistance value of an electric power cable at least includes a control unit, a test question type module and an operating module. The test question type module includes at least a test set. Each of the at least a test set includes at least an electric resistance value measuring part each of which has an electric voltage value display and an electric resistance value display to respectively display electric voltage values and electric resistance values of a corresponding cable. Besides, the operating module is used to initiate the interactive test equipment, to select answers, and the control unit is used to load question types and to make judgment on answers. Accordingly, test subjects are authenticated and evaluated for a judgment ability thereof in order for ensuring safety of a working environment.

In leakage detecting device (10) that detects an electric leakage from a high-voltage unit in which power storage unit (20) and a load are connected by a power supply line in a state of being insulated from an earth, Y capacitor (CY) is connected between the earth and a current path between power storage unit (20) and the load. Drive unit (11) of leakage detecting device (10) outputs a rectangular wave voltage to the current path between power storage unit (20) and the load via driving coupling capacitor (Cd1) to charge or discharge Y capacitor (CY). Leakage detector (12) determines presence or absence of the electric leakage between the current path and the earth according to a time transition in which the voltage at the measurement point of the current path changed according to charging or discharging of Y capacitor (CY) converges to an original voltage.

The present disclosure relates to a battery cell, and more particularly, to a cell insulation defect detection system configured to detect insulation defects of individual cells forming a battery. The cell insulation defect detection system of the present disclosure comprises a contact unit comprising a conductive roller configured to contact a battery cell to be inspected, the battery cell being rotatably housed therein, and a measurement unit configured to measure insulation resistance between the roller and the cell in contact with each other.

A failure detection apparatus includes: a first switch configured to be connected to a positive electrode of a battery; a second switch configured to be connected to a negative electrode of the battery; detection resistances that are connected in series between the first switch and the second switch; and a measurement circuit that measures a voltage of the detection resistances, wherein (i) both the first switch and the second switch are turned on to form a failure-detection series-connected circuit consisting of the battery and the detection resistances, and (ii) a failure detection mode is provided to detect a failure based on the voltage measured by the measurement circuit.

An insulation resistance detection apparatus includes: a first switch connected to a high potential side of a battery assembly including plural battery cells connected in series; a second switch connected to a low potential side of the battery assembly; a detection resistor; a controller configured to turn on one of the first switch and the second switch and turn off the other of the first switch and the second switch to form a series connection circuit including the battery assembly, an insulation resistor of the battery assembly, and the detection resistor, and calculate insulation resistance based on a voltage applied to the detection resistor, in which the first switch is connected between two battery cells on the high potential side among the plural battery cells.

An apparatus for determining insulation resistance at a PV generator includes a first unit configured to shift a generator potential at an output terminal of the PV generator, and a second unit. The second unit is configured to determine the insulation resistance by: connecting a measurement voltage to the output terminal of the PV generator, measuring a first current value and a first voltage value at the output terminal of the PV generator before the measurement voltage is connected, measuring a second current value and a second voltage value at the output terminal of the PV generator after the measurement voltage is connected, and determining the insulation resistance of the PV generator based on the measured first and second current values and the measured first and second voltage values. The first and second units are connected in series.