KR101486626B1 - Apparatus for detecting insulation resestance and diagnostic apparatus thereof - Google Patents

Abstract

The present invention relates to an apparatus for detecting an insulation resistance of a battery pack including a plurality of cells, the apparatus comprising: a first switch connected to an anode of the battery pack and turned on / off to detect a first insulation resistance; A second switch connected to the cathode to turn on / off to detect a second insulation resistance, a voltage measuring unit for measuring a voltage of the battery pack to diagnose a failure of the first switch and the second switch, And controlling the first switch and the second switch to turn on and off to measure the voltage of the battery pack and to determine whether the first switch and the second switch are faulty based on the voltage of the battery pack.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an insulation resistance detection device,

The present invention relates to a secondary battery, and more particularly, to an apparatus for detecting insulation resistance of a secondary battery and a method and apparatus for diagnosing the detection apparatus.

As the use of portable electric appliances such as video cameras, portable telephones, and portable PCs is being activated, the importance of secondary batteries, which are mainly used as driving power sources, is increasing.

Recently, research on hybrid vehicles and electric vehicles has been actively carried out as interest in environmental problems has increased. Hybrid vehicles and electric vehicles use the charge / discharge energy of the battery pack to drive the vehicle. Therefore, the hybrid vehicle and the electric vehicle have a better response to consumers in that they are more fuel efficient and can reduce pollutants than an automobile using only an engine.

As the number of products using such a chargeable / dischargeable battery increases, the problem of safety of the battery becomes important. Furthermore, batteries used in hybrid cars and electric vehicles are more important than batteries in general, because many secondary battery cells constitute one pack and many packs constitute one large capacity battery Do.

Particularly, when the insulation of the battery is deteriorated or damaged, a leakage current is generated, which may increase the power loss or discharge the battery. In addition, a device using a large capacity battery such as an electric vehicle may cause a fatal electric shock to a person. Therefore, it is important to keep the insulation of the battery in a good state.

Fig. 1 shows an insulation resistance detecting apparatus according to the prior art.

Referring to FIG. 1, the battery pack 10 includes a plurality of chargeable battery cells. The insulation resistance detection device (100) detects the insulation resistance of the battery pack (10).

The insulation resistance detection apparatus 100 includes a first detection unit 110 and a second detection unit 120. [

The first detection unit 110 detects a first insulation resistance between the negative electrode of the battery pack 10 and the ground and the second detection unit 120 detects a second insulation resistance between the positive electrode of the battery pack 10 and the ground. do.

A first switch SW1 is disposed between the first detection unit 110 and the anode of the battery pack 10 and a second switch SW2 is disposed between the second detection unit 120 and the cathode of the battery pack 10. [ do.

When the first switch (SW1) is ON, the first detector 110 detects the first insulation resistance by measuring the V _{ADC _P.} When the second switch (SW2) is ON, the detection unit 120 detects the second insulation resistance by measuring the V _{ADC _N.}

In order to detect the first and second insulation resistances, the first switch SW1 and the second switch SW2 are frequently turned ON or OFF.

If any one of the first switch SW1 and the second switch SW2 does not operate normally, the resistance value of the insulation resistance can not be detected, and as a result, the normal operation of the battery pack 10 can not be guaranteed.

Therefore, there is a need for a technique for diagnosing whether or not the switches used in the apparatus for detecting insulation resistance of a battery are faulty.

The present invention provides an apparatus and method for detecting an insulation resistance of a battery pack that can diagnose a failure.

The present invention provides a method and an apparatus for diagnosing failure of an apparatus for detecting insulation resistance of a battery pack.

An embodiment of the present invention relates to an apparatus for detecting an insulation resistance of a battery pack including a plurality of cells, the apparatus comprising: a first switch connected to an anode of the battery pack and turned on / off to detect a first insulation resistance; A second switch connected to a cathode of the battery pack to turn on / off to detect a second insulation resistance, a voltage measuring unit for measuring a voltage of the battery pack to diagnose a failure of the first switch and the second switch, And a control unit for controlling the first switch and the second switch to turn on and off to measure the voltage of the battery pack and to determine whether the first switch and the second switch are faulty based on the voltage of the battery pack, .

The voltage measuring unit charges the capacitor by the voltage of the battery pack, and measures the voltage charged in the capacitor.

The voltage measuring unit includes a first charging switch unit connected to the first switch and the second switch and turned on to charge the capacitor by the voltage of the battery pack, And a charging switch unit.

The control unit turns on the first switch and the second switch to acquire the voltage of the battery pack measured by the voltage measuring unit, and controls the first switch or the second switch It is possible to judge whether or not an open failure of the power source is detected.

Wherein the control unit turns off at least one of the first switch and the second switch to acquire a voltage of the battery pack measured by the voltage measuring unit, It is possible to judge whether or not the second switch is short-circuited.

According to another aspect of the present invention, there is provided a method for diagnosing a failure of an apparatus for detecting insulation resistance of a battery pack including a plurality of cells, the method comprising: turning on a first switch and a second switch, Measuring a second voltage of the battery pack by turning off at least one of the first switch and the second switch and measuring a second voltage of the battery pack based on the first voltage or the second voltage, 2 < / RTI > switch is faulty.

The first switch is connected to the positive electrode of the battery pack and is turned on / off to detect a first insulation resistance between the negative electrode of the battery pack and the ground. The second switch is connected to the negative electrode of the battery pack, It is turned ON / OFF to detect the second insulation resistance between the anode and the ground of the pack.

Wherein the step of measuring the first voltage of the battery pack comprises the steps of turning on the first switch and the second switch to charge the capacitor by the voltage of the battery pack and sensing the voltage charged in the capacitor, And measuring the voltage.

The step of measuring the second voltage of the battery pack may include the steps of turning off at least one of the first switch and the second switch to charge the capacitor by the voltage of the battery pack, And measuring the second voltage.

If the value of the first voltage is 0V, the first switch or the second switch may be determined as an open failure. If the value of the second voltage is greater than 0V, It can be determined that the switch and the second switch are short-circuited.

According to another aspect of the present invention, there is provided a battery pack comprising a first switch connected to an anode of a battery pack and turned on / off to detect a first insulation resistance, and a second switch connected to a cathode of the battery pack, A voltage measuring unit for measuring a voltage of the battery pack to diagnose a failure of the first switch and the second switch and a voltage measuring unit for measuring a voltage of the battery pack to diagnose a failure of the first switch and the second switch, 1 switch and the second switch to turn on and off to measure the voltage of the battery pack and to determine whether the first switch and the second switch are faulty based on the voltage of the battery pack .

The voltage measuring unit charges the capacitor by the voltage of the battery pack, and measures the voltage charged in the capacitor.

The voltage measuring unit includes a first charging switch unit connected to the first switch and the second switch and turned on to charge the capacitor by the voltage of the battery pack, And a charging switch unit.

The control unit turns on the first switch and the second switch to acquire the voltage of the battery pack measured by the voltage measuring unit, and controls the first switch or the second switch It is possible to judge whether or not an open failure of the power source is detected.

Wherein the control unit turns off at least one of the first switch and the second switch to acquire a voltage of the battery pack measured by the voltage measuring unit, It is possible to judge whether or not the second switch is short-circuited.

It is possible to diagnose whether or not the insulation resistance detecting device of the battery pack is properly operated. Furthermore, it is possible to prevent a leakage current generated due to a failure of the insulation resistance detection device, thereby preventing battery discharge and malfunction of the device.

By measuring the voltage of the battery pack through the capacitor to diagnose the failure of the insulation resistance detection device, the voltage can be measured without being influenced by the current of the battery pack. Therefore, since more accurate voltage measurement is possible, reliability can be improved in fault diagnosis of the insulation resistance detection device.

Fig. 1 shows an insulation resistance detecting apparatus according to the prior art.
2 is a block diagram illustrating an insulation resistance detection apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a method for diagnosing failure of an insulation resistance detection apparatus according to an embodiment of the present invention.
4 is a diagram illustrating a switching control state for failure diagnosis of an insulation resistance detection apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. Further, the present invention is not limited to the embodiments described below, but can be applied in various different forms within the scope of the technical idea of the present invention.

The components described in this specification may include components other than those described below as needed, and a detailed description of parts that are not directly related to the present invention will be omitted. In addition, the arrangement of each component described in this specification can be adjusted as necessary, and one component may be included in another component, and one component may be divided into two or more components.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

An electric vehicle refers to a vehicle that includes one or more electric motors as propulsive forces. The energy used to propel the electric vehicle includes an electrical source such as a rechargeable battery and / or a fuel cell. The electric vehicle may be a hybrid electric vehicle that uses a combustion engine as another power source.

The insulation resistance detection device can be used to detect the insulation resistance of a battery used in an electric vehicle. The insulation resistance detection device may be part of a BMS (Battery Management System) or may be part of an ECU (Electrical Control Unit).

The control unit may include a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. When the embodiment is implemented in software, the proposed technique can be implemented as a module (process, function, etc.) that performs the above-described functions. The module is stored in memory and can be executed by the processor. The memory may be internal or external to the processor and may be coupled to the processor by any of a variety of well known means.

2 is a block diagram illustrating an insulation resistance detection apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the battery pack 10 is a means for storing electric energy, and includes a plurality of rechargeable unit cells connected in series and / or in parallel. The unit cell is a secondary battery such as a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel metal hydride battery, or a nickel zinc battery. A plurality of battery packs 10 may be provided to form one large capacity battery in order to provide a higher output electric energy.

The insulation resistance detection apparatus 200 according to an embodiment of the present invention is for detecting insulation resistance of the battery pack 10 and includes a first detection unit 210, a second detection unit 220, a first switch 215, A second switch 225, a voltage measuring unit 230, and a control unit 240.

The first detection unit 210 detects a first insulation resistance between the negative electrode of the battery pack 10 and the ground. The first switch 215 is disposed between the first detection unit 210 and the anode of the battery pack 10 and is turned ON or OFF to detect the first insulation resistance. For example, if the first switch 215 is turned ON and the first detector 210 detects the first insulation resistance by measuring the V _{ADC _P.}

The second detection unit 220 detects a second insulation resistance between the anode of the battery pack 10 and the ground. The second switch 225 is disposed between the second detection unit 220 and the cathode of the battery pack 10 and is turned ON or OFF to detect the second insulation resistance. For example, when second switch 225 is ON, the second detection unit 220 detects the second insulation resistance by measuring the V _{ADC _N.}

The voltage measuring unit 230 measures the voltage of the battery pack 10 to diagnose the failure of the first switch 215 and the second switch 225. [

To this end, the voltage measuring unit 230 includes a first charging switch unit 233 and a second charging switch unit 235. The capacitor 231 is charged by the voltage of the battery pack 10 when the first charging switch unit 233 and the second charging switch unit 235 are turned on and off. The voltage measuring unit 230 measures the voltage charged in the capacitor 231 and provides the measured voltage to the controller 240 to diagnose the failure of the first switch 215 and the second switch 225.

Here, by measuring the voltage of the battery pack 10 through the capacitor 231 according to an embodiment of the present invention, the voltage can be measured without being affected by the current amount of the battery pack 10. [ Therefore, it is possible to more accurately measure the voltage, thereby increasing the reliability in the failure diagnosis of the insulation resistance detection device 200. [ In addition, the voltage measurement process of the capacitor 231 is simple, and the capacitor 231 is used to simplify the circuit necessary for voltage measurement.

The first charging switch unit 233 is connected between the first switch 215 and the second switch 225 and the capacitor 231 in order to charge the capacitor 231 by the voltage of the battery pack 10. [ Lt; / RTI > The second charging switch unit 235 is connected to the capacitor 231 to measure the voltage charged in the capacitor 231 and is turned on / off.

For example, the first charging switch unit 233 may include a third switch SW3 and a fourth switch SW4. The third switch SW3 turns ON / OFF the connection between the first switch 215 and the first terminal of the capacitor 231 and the fourth switch SW4 turns ON / OFF the connection between the second switch 225 and the capacitor 231 The connection between the second terminals can be turned ON / OFF. Here, 'OFF' means that the corresponding connection is disconnected, and 'ON' is the opposite. The second charging switch unit 235 may include a fifth switch SW5 and a sixth switch SW6. The fifth switch SW5 may be connected to the first terminal of the capacitor 231 and the sixth switch SW6 may be disposed between the second terminal of the capacitor 231 and the ground.

Therefore, when the third switch SW3 and the fourth switch SW4 are turned on and the fifth switch SW5 and the sixth switch SW6 are turned off, the capacitor 231 is connected to the voltage of the battery pack 10 . Conversely, when the third switch SW3 and the fourth switch SW4 are turned off and the fifth switch SW5 and the sixth switch SW6 are turned on, the voltage measuring unit 230 charges the capacitor 231 the voltage (V _{ADC _ MCU)} can be measured.

Here, the first switch 215 and the second switch 225 may be connected in series with a resistor 237 including at least one resistor. At this time, the voltage measurement section 230 has at least one resistor (R _ADC) and is connected, a resistor (R _ADC) voltage (V _{ADC _ MCU)} of a battery pack 10 is applied to a can obtained as shown in Equation 1 below have.

Here, V_Pack is a voltage of the battery pack 10, and R ₁ , R ₂ , ..., R _ADC , and R _n are resistors connected in series to the battery pack 10.

Controller 240 is out of order if the battery pack 10, the voltage obtained (V _{ADC _ MCU),} and Based on this, the first switch 215 and second switch 225 of the measurement by the voltage measuring unit 230 . The control unit 240 turns on / off the first switch 215, the second switch 225, the first charging switch unit 233, and the second charging switch unit 235.

More specifically, the controller 240 obtains a first switch 215 and a voltage (V _{ADC _ MCU)} of the second switch, the battery pack 10 is measured by ON to 225 by the voltage measurement unit 230 . If, when the voltage of the battery pack (10) (V _{ADC _ MCU)} is 0V control unit 240 may determine the disconnection (open) failure if the first switch 215 or second switch 225.

Further, the control unit 240 to obtain a first switch 215 and second switch 225, the voltage (V _{ADC _ MCU)} of a battery pack 10, as measured by of OFF for at least one from the voltage measurement section 230, do. If, the voltage of the battery pack (10) (V _{ADC _ MCU)} is greater than 0V control unit 240 may determine the short-circuit (short) fault if the first switch 215 and second switch 225 .

FIG. 3 is a flowchart illustrating a method for diagnosing a fault of an insulation resistance detection apparatus according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a switching control state for fault diagnosis of an insulation resistance detection apparatus according to an embodiment of the present invention. to be. This method can be performed by the insulation resistance detection device 200 of FIG.

3 and 4, the insulation resistance detection unit 200 includes a first switch 215 to ON, the first voltage (V _{ADC _ MCU)} of a to turn OFF the second switch 225, a battery pack 10 (S10). At this time, the third switch SW3 and the fourth switch SW4 are turned on, the fifth switch SW5 and the sixth switch SW6 are turned off so that the capacitor 231 is charged by the voltage of the battery pack 10 do. Thereafter, the third switch SW3 and the fourth switch SW4 are turned off, the fifth switch SW5 and the sixth switch SW6 are turned on to sense the voltage charged in the capacitor 231 to generate the first voltage V _{ADC _ MCU} ) is measured.

And insulation resistance detecting apparatus 200 to turn ON the first switch 215 is OFF, the second switch 225, measuring a second voltage (V _{ADC _ MCU)} of a battery pack (10) (S20). At this time, the third switch SW3 and the fourth switch SW4 are turned on, the fifth switch SW5 and the sixth switch SW6 are turned off so that the capacitor 231 is charged by the voltage of the battery pack 10 do. Thereafter, the third switch SW3 and the fourth switch SW4 are turned OFF, the fifth switch SW5 and the sixth switch SW6 are turned ON to sense the voltage charged in the capacitor 231 to generate the second voltage V _{ADC _ MCU} ) is measured.

And insulation resistance detecting apparatus 200 to turn ON the first switch 215 and second switch 225, measuring a third voltage (V _{ADC _ MCU)} of a battery pack (10) (S30). At this time, the third switch SW3 and the fourth switch SW4 are turned on, the fifth switch SW5 and the sixth switch SW6 are turned off so that the capacitor 231 is charged by the voltage of the battery pack 10 do. Thereafter, the third switch SW3 and the fourth switch SW4 are turned OFF, the fifth switch SW5 and the sixth switch SW6 are turned ON to sense the voltage charged in the capacitor 231 to generate the third voltage V _{ADC _ MCU} ) is measured.

And insulation resistance detecting apparatus 200 to turn OFF the first switch 215 and second switch 225, measuring a fourth voltage (V _{ADC _ MCU)} of a battery pack (10) (S40). At this time, the third switch SW3 and the fourth switch SW4 are turned on, the fifth switch SW5 and the sixth switch SW6 are turned off so that the capacitor 231 is charged by the voltage of the battery pack 10 do. Thereafter, the third switch SW3 and the fourth switch SW4 are turned OFF, the fifth switch SW5 and the sixth switch SW6 are turned ON to sense the voltage charged in the capacitor 231 to generate the fourth voltage V _{ADC _ MCU} ) is measured.

Here, the times at which the first switches 215 and the second switches 225 are ON in the steps S10 to S40 may be the same, but each step may have different ON durations. For example, in steps S10 and S20, ON of the first switch 215 and the second switch 225 is continued for 500 ms, and steps S30 and S40 are repeated for 300 ms to 400 ms ON of the first switch 215 and the second switch 225 can be continued.

There is no limitation in the order of execution of steps S10 to S40. For example, step S40 may be followed by step S30, step S20 and step S10, or steps S20, S40, S30, Step S10 may be performed in this order. In addition, step S10 to step S40 may be repeated several times and then step S50 may be performed.

Table 1 below shows the values of the first voltage to the fourth voltage measured by the insulation resistance detecting device 200 by performing steps S10 to S40. Here, Table 1 shows the voltage (V _{ADC _ MCU)} of the first switch 215 and second switch, the battery pack 10 is measured when 225 is to be operating properly.

switch In step S10, In step S20, In step S30, In step S40, The first switch ON OFF ON OFF The second switch OFF ON ON OFF V _{ADC _ MCU} 0 0 V_ADC 0

Here, the V_ADC value can be calculated by Equation (1).

The insulation resistance detection device 200 determines whether the first switch and the second switch have failed based on the measured first to fourth voltages by performing the above-described steps (S10) to (S40) (S50).

Failure type switch Explanation OPEN The first switch Step (S10) to the voltage of the battery pack 10 is measured at step (S40), (V _{ADC _ MCU)} when the values are all 0V, the first switch or the second switch is judged by fault OPEN The second switch SHORT The first switch When the voltage (V _{ADC _ MCU)} value of the battery pack 10 is measured at step (S20) V_ADC, the first switch determines a failure SHORT The second switch When the voltage (V _{ADC _ MCU)} value of the battery pack 10 is measured at step (S10) V_ADC, the second switch is judged by fault SHORT

In the fault type, 'OPEN' means a fault in which the corresponding switch is continuously open, that is, a disconnection state, and 'SHORT' means a fault in which the corresponding switch is kept closed, that is, a short circuit state.

Wherein, according to Table 2, the first switch 215 and the second is the voltage (V _{ADC _ MCU)} value of the battery pack 10 is measured when sikyeoteul ON the switch 225 as the V_ADC 0V, the first switch ( 215) or the second switch 225 is OPEN failure. Further, the first switch 215 and second switch 225. When the voltage (V _{ADC _ MCU)} value of the battery pack 10 is measured when sikyeoteul OFF at least one, not 0V of V_ADC, the first switch (215 ) And the second switch 225 can be determined.

In the above-described embodiments, although the methods are described on the basis of a flowchart as a series of steps or blocks, the present invention is not limited to the order of the steps, and some steps may occur in different orders or in a different order than the steps described above have. It will also be understood by those skilled in the art that the steps depicted in the flowchart illustrations are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention You will understand.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of the claims should be construed as being included in the scope of the present invention.

10: Battery pack
200: Insulation resistance detection device
210: first detection unit
215: first switch
220: second detection section
225: second switch
230: Voltage measuring unit
231: Capacitor
233: first charge switch section
235: second charge switch section
237:
240:

Claims (16)

An apparatus for detecting an insulation resistance of a battery pack including a plurality of cells,
A first switch connected to an anode of the battery pack and turned on / off to detect a first insulation resistance;
A second switch connected to a cathode of the battery pack and turned on / off to detect a second insulation resistance;
A voltage measuring unit for measuring a voltage of the battery pack to diagnose a failure of the first switch and the second switch; And
A controller for controlling the first switch and the second switch to turn on and off to measure the voltage of the battery pack and to determine whether the first switch and the second switch are faulty based on the voltage of the battery pack; , ≪ / RTI &
The voltage measuring unit includes:
A first charging switch unit connected to the first switch and the second switch and turned on to charge the capacitor by the voltage of the battery pack, and a second charging switch unit turned on to measure the voltage charged in the capacitor And an insulation resistance detection unit for detecting an insulation resistance of the insulation resistance. The method according to claim 1,
The voltage measuring unit includes:
Wherein the capacitor is charged by the voltage of the battery pack, and the voltage charged in the capacitor is measured. delete The method according to claim 1,
Wherein,
The first switch and the second switch are turned on to acquire the voltage of the battery pack measured by the voltage measuring unit, and a disconnection of the first switch or the second switch based on the obtained voltage of the battery pack open) failure of the insulation resistance. The method according to claim 1,
Wherein,
Wherein at least one of the first switch and the second switch is turned off to acquire a voltage of the battery pack measured by the voltage measuring unit, and based on the obtained voltage of the battery pack, And a short-circuit failure of the insulation resistance detection device. A method for diagnosing a failure of an apparatus for detecting an insulation resistance of a battery pack including a plurality of cells,
Measuring a first voltage of the battery pack by turning on a first switch and a second switch;
Turning off at least one of the first switch and the second switch to measure a second voltage of the battery pack; And
And determining whether the first switch and the second switch are failed based on the first voltage or the second voltage,
Wherein measuring the first voltage of the battery pack comprises:
Turning on the first switch and the second switch to charge the capacitor by the voltage of the battery pack; And
And measuring the first voltage by sensing a voltage charged in the capacitor. The method according to claim 6,
The first switch is connected to the positive electrode of the battery pack and is turned on / off to detect a first insulation resistance between the negative electrode of the battery pack and the ground. The second switch is connected to the negative electrode of the battery pack, And turns on / off to detect a second insulation resistance between the anode of the pack and the ground. delete The method according to claim 6,
Wherein measuring the second voltage of the battery pack comprises:
Turning off at least one of the first switch and the second switch so that the capacitor is charged by the voltage of the battery pack; And
And measuring the second voltage by sensing a voltage charged in the capacitor. ≪ Desc / Clms Page number 19 > The method according to claim 6,
And determines that the first switch or the second switch is an open failure when the value of the first voltage is 0V. The method according to claim 6,
And determining that the first switch and the second switch are short-circuited if the value of the second voltage is greater than 0V. A first switch connected to an anode of the battery pack and turned on / off to detect a first insulation resistance, and a second switch connected to the cathode of the battery pack and turned on / off to detect a second insulation resistance An apparatus for diagnosing a fault in a resistance detection apparatus,
A voltage measuring unit for measuring a voltage of the battery pack to diagnose a failure of the first switch and the second switch; And
A controller for controlling the first switch and the second switch to turn on and off to measure the voltage of the battery pack and to determine whether the first switch and the second switch are faulty based on the voltage of the battery pack; , ≪ / RTI &
The voltage measuring unit includes:
A first charging switch unit connected to the first switch and the second switch and turned on to charge the capacitor by the voltage of the battery pack, and a second charging switch unit turned on to measure the voltage charged in the capacitor And the diagnostic device. 13. The method of claim 12,
The voltage measuring unit includes:
Wherein the capacitor is charged by the voltage of the battery pack, and the voltage charged in the capacitor is measured. delete 13. The method of claim 12,
Wherein,
The first switch and the second switch are turned on to acquire the voltage of the battery pack measured by the voltage measuring unit, and a disconnection of the first switch or the second switch based on the obtained voltage of the battery pack open) failure of the diagnostic device. 13. The method of claim 12,
Wherein,
Wherein at least one of the first switch and the second switch is turned off to acquire a voltage of the battery pack measured by the voltage measuring unit, and based on the obtained voltage of the battery pack, Is short-circuited or short-circuited.

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