KR20210051539A - Apparatus for diagnosing isolation of battery - Google Patents

Abstract

Disclosed is an apparatus for diagnosing whether dielectric breakdown of a battery exists. An objective of the present invention is to provide an apparatus for diagnosing battery insulation which eliminates the need for controlling an insulating switch and has simplified components. According to one aspect of the present invention, the apparatus for diagnosing battery insulation comprises: a first voltage distribution circuit positioned between an anode terminal of a battery cell and the ground, provided with a first distribution resistor and a first reference resistor connected in series with each other, and directly connected to a charging/discharging path of the battery cell; a second voltage distribution circuit positioned between a cathode terminal of the battery cell, provided with a second distribution resistor, a second reference resistor, and reference power connected in series with each other, and directly connected to the charging/discharging path of the battery cell; a voltage detection unit which measures a first diagnosis voltage between the first distribution resistor and the first reference voltage, and a second diagnosis voltage between the second distribution resistor and the second reference resistor; and a control unit which uses the first diagnosis voltage and the second diagnosis voltage measured by the voltage detection unit, and the current flowing through the first voltage distribution circuit and the second voltage distribution circuit to diagnose whether dielectric breakdown of a battery exists.

Description

Battery insulation diagnostic device {APPARATUS FOR DIAGNOSING ISOLATION OF BATTERY}

The present invention relates to a battery insulation diagnosis technology, and more particularly, to an apparatus for diagnosing insulation breakdown of a battery in order to determine whether a battery has a short circuit, and a battery pack including the same.

In recent years, the demand for portable electronic products such as smart phones and notebook computers has been rapidly increased. In particular, in recent years, demand and interest in battery-powered vehicles such as electric vehicles and hybrid vehicles are gradually increasing.

Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries, among which lithium secondary batteries have little memory effect compared to nickel-based secondary batteries, so charging and discharging are free. , It is widely used for its advantages such as very low self-discharge rate and excellent output.

Various characteristics are required for such a battery, and one of the important characteristics is safety. Various items can be included as a matter to ensure the safety of the battery. In particular, one of the important factors for the safety of the battery is the insulation of the battery, which indicates the insulation state between the battery and the device. If the insulation of the battery is destroyed, a leakage current may occur in the battery and unexpected discharge of the battery may occur. In addition, it may cause malfunction or damage to devices such as electronic devices connected to the battery. In particular, since an electric vehicle including a hybrid vehicle receives driving power of the vehicle from a battery, such a battery for an electric vehicle has high voltage and high output characteristics in most cases. Therefore, if the insulation of the battery for an electric vehicle is destroyed, it may cause damage to various equipment of the vehicle, and may cause a fatal electric shock to the occupant or operator. Therefore, it is necessary to reliably grasp whether or not the insulation of the battery is properly secured.

In order to determine the insulation of such a battery, conventionally, various methods for detecting a leakage current of a battery have been proposed or adopted. In particular, as a representative technology for detecting a leakage current of a battery, an insulated switch and a voltage divider circuit configured in a form in which a plurality of resistors are disposed at both ends of the battery may be mentioned. In such a conventional voltage distribution circuit configuration, the isolated switches disposed at both ends are sequentially turned on/off, and the insulation resistance is determined based on information collected during the on/off process of the switch.

However, in this conventional technique for measuring insulation resistance by a voltage dividing circuit, an insulated switch must be provided, and moreover, various pieces of information must be collected in a state in which the insulated switch is properly controlled. Accordingly, the control configuration of the switch for measuring the insulation resistance is complicated, the accuracy may be degraded during this process, and there may be problems such as that it takes a long time and consumes a lot of power.

Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to provide an insulation diagnosis device, etc., which does not require control of an insulation type switch and has a more simplified configuration.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

The battery insulation diagnosis apparatus according to the present invention for achieving the above object includes a first distribution resistor and a first reference resistance positioned between a positive terminal of a battery cell and a ground, connected in series with each other, and the battery cell A first voltage divider circuit directly connected to the charge/discharge path of the; A second voltage distribution circuit positioned between the negative terminal of the battery cell and the ground, having a second distribution resistor, a second reference resistance, and a reference power connected in series with each other, and directly connected to a charge/discharge path of the battery cell; A voltage detector configured to measure a first diagnosis voltage between the first distribution resistor and the first reference resistance and a second diagnosis voltage between the second distribution resistance and the second reference resistance; And a control unit for diagnosing whether the battery is damaged by using the first and second diagnosis voltages measured by the voltage detector, and current flowing through the first voltage divider circuit and the second voltage divider circuit. Includes.

Here, the control unit may calculate a leakage current as a difference between the current flowing through the first voltage divider circuit and the second voltage divider circuit, and use the calculated leakage current to diagnose whether the battery is damaged by insulation. have.

In addition, the battery insulation diagnosis apparatus according to the present invention includes: a positive electrode diagnosis resistor positioned between a positive terminal of the battery cell and a ground, and connected in parallel with the first voltage divider circuit; And a negative diagnostic resistor positioned between the negative terminal of the battery cell and the ground, and connected in parallel with the second voltage divider circuit.

In addition, the positive electrode diagnosis resistor and the negative electrode diagnosis resistor may be configured to have the same resistance value.

In addition, the controller calculates a battery leakage current as a difference between a current flowing through the first voltage divider circuit and a current flowing through both the second voltage divider circuit, the positive electrode diagnosis resistor, and the negative electrode diagnosis resistor, and the calculated battery Using the leakage current, it is possible to diagnose whether the battery is damaged or not.

In addition, the controller calculates a current flowing through the positive diagnostic resistor using the positive terminal voltage of the battery cell and the resistance value of the positive diagnostic resistor, and the negative terminal voltage of the battery cell and the resistance value of the negative diagnostic resistor The current flowing through the negative electrode diagnosis resistor may be calculated using.

The control unit may compare the voltage of the positive terminal of the battery cell with the voltage of the negative terminal of the battery cell to determine the location of the insulation breakdown of the battery.

When it is determined that the insulation breakdown position of the battery is toward the positive terminal of the battery cell, the controller may estimate the insulation resistance of the positive terminal of the battery using a battery leakage current and the first diagnostic voltage.

In addition, when it is determined that the insulation breakdown position of the battery is toward the negative terminal of the battery cell, the control unit uses a battery leakage current, the second diagnosis voltage, and a reference voltage supplied by the reference power. Insulation resistance on the negative terminal side can be estimated.

In addition, the battery pack according to the present invention may include the battery insulation diagnosis apparatus according to the present invention.

In addition, the vehicle according to the present invention may include the battery insulation diagnosis apparatus according to the present invention.

According to an aspect of the present invention, it is possible to more effectively detect the insulation resistance of a battery to measure whether a current leaks in the battery.

In particular, according to an embodiment of the present invention, in the process of detecting the insulation resistance of the battery, it is not necessary to control the insulation type switch of the voltage distribution circuit.

In addition, according to an embodiment of the present invention, in performing the switching operation for detecting the insulation resistance of the battery, there is no need to undergo a switching stabilization process.

Further, according to an embodiment of the present invention, in the voltage distribution circuit for detecting the insulation resistance of the battery, it is not necessary to have insulated switches at both ends of the battery.

Accordingly, according to at least one embodiment of the present invention, a configuration or operation for detecting the insulation resistance of a battery may be more simplified.

Therefore, in this case, it is possible to reduce the time or power required to detect the insulation resistance of the battery.

In addition, in this case, the accuracy of the detection of the insulation resistance of the battery may be further improved.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the present invention to be described later, so the present invention is described in such drawings. It is limited to and should not be interpreted.
1 is a block diagram schematically showing a functional configuration of an apparatus for diagnosing battery insulation according to an embodiment of the present invention.
2 is a diagram schematically illustrating a configuration of a battery pack including an apparatus for diagnosing battery insulation according to an embodiment of the present invention.
3 is a diagram schematically illustrating a circuit configuration of a battery pack including an apparatus for diagnosing battery insulation according to an embodiment of the present invention.
4 is a diagram schematically illustrating a configuration of a battery pack including an apparatus for diagnosing battery insulation according to another exemplary embodiment of the present invention.
5 is a diagram illustrating an example of a circuit configuration to which the battery insulation diagnostic device of FIG. 4 is applied.
FIG. 6 is a diagram schematically illustrating a circuit configuration when insulation on a positive terminal side is broken in a battery pack including an apparatus for diagnosing battery insulation according to an exemplary embodiment of the present invention.
FIG. 7 is a diagram schematically illustrating a circuit configuration when insulation on a negative terminal side is destroyed in a battery pack including an apparatus for diagnosing battery insulation according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention.

Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention. It should be understood that there may be equivalents and variations.

1 is a block diagram schematically showing a functional configuration of a battery insulation diagnosis apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a configuration of a battery pack including a battery insulation diagnosis apparatus according to an embodiment of the present invention. It is a figure shown by.

1 and 2, the battery insulation diagnosis apparatus according to the present invention includes a first voltage divider circuit 100, a second voltage divider circuit 200, a voltage detector 300, and a control unit 400. .

The first voltage divider circuit 100 may be positioned between a positive terminal of the battery cell 1 and a ground.

Here, the battery cell 1 is a means for storing electrical energy and may include one or more secondary batteries. For example, the battery cell 1 may be configured in a form in which a plurality of secondary batteries are connected in series and/or in parallel.

In addition, the battery pack may be provided with pack terminals (Pack+, Pack-), and may be configured to connect external devices of the battery pack. That is, an external device is provided at the pack terminals (Pack+, Pack-) of the battery pack, so that energy can be supplied from the battery cell 1 (discharge of the battery pack) or energy can be supplied to the battery cell 1 (battery pack Of charge). To this end, in the internal space of the battery pack, a charge/discharge path may be provided in a path between the battery cell 1 and the pack terminals Pack+ and Pack-. When a load is connected to the pack terminal side, the charge/discharge path is electrically connected to form one closed circuit, so that a charge/discharge current can flow, structurally, the positive charge/discharge path (P+) and the negative charge/discharge path (P- ) Can be distinguished. The positive charge/discharge path (P+) represents a path between the positive terminal (C+) of the battery cell 1 and the positive pack terminal (Pack+), and the negative charge/discharge path (P-) is the negative terminal ( It may represent a path between C-) and the negative pack terminal (Pack-).

The first voltage divider circuit 100 may be located between a positive charge/discharge path P+ of the battery cell 1 and a ground. That is, the battery insulation diagnosis apparatus according to the present invention, as shown in FIG. 2, is a first voltage distribution path D1, a node N1 on the positive charge/discharge path P+ of the battery cell 1, and It may have a path to connect the ground. In addition, the first voltage divider circuit 100 may be located on the first voltage divider path D1.

The first voltage divider circuit 100 may include a first divider resistor 110 and a first reference resistor 120. Furthermore, the first distribution resistor 110 and the first reference resistor 120 may be connected in series with each other. This will be described in more detail with reference to FIG. 3.

In particular, in the battery insulation diagnosis apparatus according to the present invention, the first voltage divider circuit 100 may be directly connected to a charge/discharge path of the battery cell 1. Here, direct connection may mean that no other components are interposed therebetween. That is, the first voltage divider circuit 100 may have one end connected to the positive charge/discharge path (P+) of the battery cell 1, such that the first voltage divider circuit 100 and the positive charge/discharge of the battery cell 1 Other components may not exist between the paths P+. In particular, a switching element may not be provided between the first voltage divider circuit 100 and the positive charge/discharge path P+ of the battery cell 1.

In addition, a switching element may not be provided in the first voltage divider circuit 100 as well as between the first voltage divider circuit 100 and the ground. In other words, no switching element may be provided in the first voltage distribution path D1 where the first voltage distribution circuit 100 is located.

Accordingly, the first voltage divider circuit 100 may be configured to maintain a connected state at all times between the positive charge/discharge path P+ of the battery cell 1 and the ground. Of course, such a connection maintenance state includes a switching element, but may include that the switching element is always maintained in a turned-on state.

The second voltage divider circuit 200 may be positioned between the negative terminal of the battery cell 1 and the ground. That is, the second voltage distribution circuit 200 may be located between the negative charge/discharge path P- of the battery cell 1 and the ground. More specifically, referring to FIG. 2, the battery insulation diagnosis apparatus according to the present invention includes, as a second voltage distribution path D2, a node on the negative charge/discharge path P- of the battery cell 1 It may have a path to connect the ground. In addition, the second voltage distribution circuit 200 may be located on the second voltage distribution path D2.

The second voltage divider circuit 200 may include a second distribution resistor 210, a second reference resistor, and a reference power supply 230. Moreover, the second distribution resistor 210, the second reference resistor, and the reference power supply 230 may be configured in a series connected to each other, which will be described in more detail with reference to FIG. 3.

In particular, in the battery insulation diagnosis apparatus according to the present invention, the second voltage divider circuit 200 may be directly connected to a charge/discharge path of the battery cell 1. Here, the meaning of “direct connection” may mean that no other components are interposed therebetween, as described above with respect to the first voltage divider circuit 100. That is, the second voltage divider circuit 200 may have one end connected to the negative charge/discharge path P- of the battery cell 1, and the second voltage divider circuit 200 and the negative charge of the battery cell 1 Other components may not exist between the discharge paths P-. In particular, a switching element may not be provided between the second voltage divider circuit 200 and the negative charge/discharge path P- of the battery cell 1.

In addition, a switching element may not be provided in the second voltage divider circuit 200 as well as between the second voltage divider circuit 200 and the ground. In other words, no switching element may be provided in the second voltage distribution path D2 where the second voltage distribution circuit 200 is located.

Accordingly, the second voltage distribution circuit 200 may be configured to maintain a connected state at all times between the negative charge/discharge path P- of the battery cell 1 and the ground. Of course, such a connection maintenance state includes a switching element, but may include that the switching element is always maintained in a turned-on state.

The voltage detector 300 may be configured to measure a first diagnostic voltage, which is a voltage between the first distribution resistor 110 and the first reference resistor 120 in a first voltage divider circuit. In addition, the voltage detector 300 may be configured to measure a second diagnostic voltage, which is a voltage between the second distribution resistor 210 and the second reference resistor 220 in a second voltage divider circuit. In addition, the voltage detection unit 300 may be configured to transmit information on the measured voltage to the control unit 400 or the like.

The voltage detector 300 may employ various voltage measurement and data transmission techniques known at the time of filing of the present invention in order to measure and transmit the first and second diagnostic voltages. For example, the voltage detector 300 may be implemented using at least one of various voltage sensors known at the time of filing of the present invention.

The controller 400 may receive information on the voltage transmitted from the voltage detector 300. That is, the controller 400 may receive the first diagnosis voltage and the second diagnosis voltage measured by the voltage detector 300. In addition, the controller 400 uses the first and second diagnosis voltages, and the current flowing through the first voltage divider circuit 100 and the second voltage divider circuit 200 to provide insulation of the battery, that is, the battery. It can be configured to diagnose whether the insulation is broken.

Meanwhile, the control unit 400 includes a processor known in the art, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, a data processing device, etc. to execute various control logics performed in the present invention. Can optionally include. In addition, when the control logic is implemented in software, the control unit 400 may be implemented as a set of program modules. In this case, the program module may be stored in a memory and executed by a processor. The memory may be inside or outside the processor, and may be connected to the processor by various well-known means. Moreover, the battery pack often includes a control unit referred to as a microcontroller unit (MCU) or a battery management system (BMS). The control unit 400 may be implemented by components such as an MCU or a BMS provided in such a conventional battery pack.

3 is a diagram schematically illustrating a circuit configuration of a battery pack including an apparatus for diagnosing battery insulation according to an embodiment of the present invention. However, in FIG. 3, the voltage detection unit 300 and the control unit 400 are not shown in order to clearly show the circuit configuration.

Meanwhile, in FIG. 3, as indicated by a dotted line, resistance components are shown to be connected to the positive terminal side of the battery pack and the negative terminal side of the battery pack, respectively. Here, the resistance component connected to the positive terminal side of the battery pack may be referred to as the insulation resistance of the positive terminal side of the battery, and the resistance component connected to the negative terminal side of the battery cell 1 may be referred to as the insulation resistance of the negative terminal side of the battery. These insulation resistance components, as virtual resistance components corresponding to the insulation state of the battery, will have sufficiently large resistance values when the insulation state of the battery is well maintained. However, when the insulation state of the battery is destroyed, these insulation resistance components will become very small below the reference value. Therefore, it can be determined whether the insulation state of the battery is destroyed through the resistance value of the insulation resistance.

Referring to FIG. 3, a first distribution resistor 110 and a first reference resistor 120 provided in the first voltage divider circuit 100 may be connected in series with each other. In particular, the first voltage dividing circuit 100 is such that the first distribution resistor 110 is located on the positive charge/discharge path (P+) side of the battery pack, and the first reference resistor 120 is located on the ground (chassis) side. Can be configured. In addition, a voltage between the first distribution resistor 110 and the first reference resistor 120 in the first voltage divider circuit 100 may be measured by the voltage detector 300 as a first diagnostic voltage Vc1. .

In particular, the first voltage divider circuit 100 may be configured such that a resistance value of the first distribution resistor 110 is much larger than a resistance value of the first reference resistor 120. For example, in the first voltage divider circuit 100, the first distribution resistor 110 is implemented as a resistance element having a resistance value of 8㏁, and the first reference resistor 120 has a resistance value of 72㏀. It can be implemented as a resistive element.

In addition, referring to FIG. 3, the second distribution resistor 210, the second reference resistor 220, and the reference power 230 provided in the second voltage divider circuit 200 may be connected in series with each other. In particular, from the negative charge/discharge path of the battery pack to the ground, the second distribution resistor 210, the second reference resistor 220, and the reference power source 230 may be sequentially positioned. That is, in the second voltage distribution circuit 200, the second distribution resistor 210 is located on the negative charge/discharge path side, the reference power source 230 is located on the ground side, and the second reference resistance 220 is, It may be disposed between the second distribution resistor 210 and the reference power supply 230. Furthermore, the reference power supply 230 may be configured such that the positive terminal is located on the second reference resistor 220 side and the negative terminal is located on the ground side.

In particular, in the second voltage divider circuit 200, a resistance value of the second distribution resistor 210 may be much larger than a resistance value of the second reference resistor 220. Moreover, the second voltage divider circuit 200 may be configured to be symmetrical with the first voltage divider circuit 100 except for the reference power supply 230. That is, the second distribution resistor 210 may have the same resistance value as the first distribution resistor 110, and the second reference resistor 220 may be configured to have the same resistance value as the first reference resistance 120. For example, in the second voltage divider circuit 200, the second distribution resistor 210 is implemented as a resistance element having a resistance value of 8㏁ like the first distribution resistor 110, and the second reference resistance 220 ) May be implemented as a resistance element having a resistance value of 72 kΩ like the first reference resistor 120. Meanwhile, the reference power supply 230 may be set to a value suitable for converting the measured voltage value from analog to digital (AD conversion).

The control unit 400 diagnoses whether the battery is damaged by using the first diagnosis voltage and current of the first voltage divider circuit 100, and the second diagnosis voltage and current of the second voltage divider circuit 200. I can.

Here, the controller 400 may calculate a current flowing through the first voltage divider circuit 100 using the first diagnostic voltage and the resistance value of the first reference resistor 120 through the following equation.

(Equation 1)

Id1 = Vc1 / Rref1

Here, Id1 denotes a current flowing through the first voltage divider circuit 100, Vc1 denotes a first diagnostic voltage value, and Rref1 denotes a resistance value of the first reference resistor 120. Here, Id1 is the current in the direction from the positive charge/discharge path of the battery pack toward the ground.

In addition, the controller 400 may calculate a current flowing through the second voltage divider circuit 200 using the second diagnostic voltage and the resistance value of the second reference resistor 220 through the following equation.

(Equation 2)

Id2 = (Vref -Vc2) / Rref2

Here, Id2 represents the current flowing through the second voltage divider circuit 200, Vref represents the voltage value of the reference power supply 230, Vc2 represents the second diagnostic voltage value, and Rref2 represents the second reference resistance 220. Represents the resistance value of In particular, Id2 is a current in a direction from the ground to the negative charge/discharge path of the battery pack, as shown in the figure.

In addition, the controller 400 may calculate the battery leakage current IL using Id1 and Id2 calculated as described above. Here, IL may be a current in a direction from ground to a positive charge/discharge path and/or a negative charge/discharge path of the battery pack. In particular, the battery leakage current IL is a leakage current ILp flowing through the positive insulation resistance 10, a leakage current ILn flowing through the negative insulation resistance 20, or a leakage current ILp flowing through both ends thereof (ILp, ILn) may be a sum value.

As described above, in the case of the battery insulation diagnosis apparatus according to the present invention, the first distribution resistor 110 and the second distribution resistor 210 may be directly connected to the charge/discharge path of the battery pack.

That is, as shown in FIG. 3, in the first voltage divider circuit 100, the first distribution resistor 110 is located on the positive charge/discharge path side of the battery pack, and the first distribution resistor 110 is a battery It is directly connected to the positive charge/discharge path of the pack, and other components may not be provided between the first distribution resistor 110 and the positive charge/discharge path of the battery pack. In particular, according to the conventional battery insulation diagnostic technology, in such a positive-side voltage divider circuit, an insulated switch is often provided between the positive-side distribution resistor and the positive-side charge/discharge path. However, in the case of the battery insulation diagnosis apparatus according to the embodiment of the present invention, there is no need to provide an insulated switch between the first distribution resistor 110, which is a distribution resistor on the positive side, and the positive charge/discharge path. Furthermore, in the case of the battery insulation diagnosis apparatus according to an embodiment of the present invention, it is not necessary to include a switch in the entire first voltage distribution circuit 100.

In addition, in the case of the battery insulation diagnosis apparatus according to the present invention, the second distribution resistor 210 may be directly connected to the negative terminal of the battery.

That is, as shown in FIG. 3, in the second voltage distribution circuit 200, the second distribution resistor 210 is located on the negative charge/discharge path side of the battery pack, and the second distribution resistor 210 is a battery It is directly connected to the negative charge/discharge path of the pack, and other components may not be provided between the second distribution resistor 210 and the negative charge/discharge path of the battery pack. In particular, according to the conventional battery insulation diagnostic technology, in such a negative-side voltage divider circuit, an insulated switch is provided between the negative-side distribution resistor and the negative-side charge/discharge path in most cases. However, in the case of the battery insulation diagnosis apparatus according to the embodiment of the present invention, there is no need to provide an insulation type switch between the second distribution resistor 210, which is a negative distribution resistor, and a negative charge/discharge path. Furthermore, in the case of the battery insulation diagnosis apparatus according to an embodiment of the present invention, it is not necessary to include a switch in the entire second voltage distribution circuit 200.

In the case of a configuration in which a switch is not provided in the first voltage divider circuit 100 and/or the second voltage divider circuit 200 as in the above embodiment of the present invention, an element called a switch can be removed from the voltage divider circuit. In addition, the configuration of the battery insulation diagnosis device may be more simple. Accordingly, the manufacturing cost and time of the battery insulation diagnostic device can be reduced. Moreover, according to the above embodiment, it is not necessary to control the switches provided in the first voltage divider circuit 100 and/or the second voltage divider circuit 200 to operate on/off at an appropriate time. Accordingly, a configuration for diagnosing battery insulation may be more simplified, and an error in estimating battery insulation resistance may be reduced, and thus accuracy may be improved. In addition, conventionally, for a more accurate diagnosis, a predetermined switching stabilization time was required after the switching operation, but according to the above aspect of the present invention, such a switching stabilization time is unnecessary. Therefore, the battery insulation diagnosis time can be further shortened.

Preferably, the controller 400 calculates a battery leakage current, that is, a leakage current flowing through the battery pack, using the current flowing through the first voltage divider circuit 100 and the current flowing through the second voltage divider circuit 200. I can.

For example, as shown in FIG. 3, when the first voltage divider circuit 100, the second voltage divider circuit 200, and the battery leakage current are Id1, Id2, and IL, respectively, between each current The relationship can be expressed as follows.

(Equation 3)

IL = Id1-Id2

That is, the total leakage current IL flowing through the positive and negative terminals of the battery is equal to the current flowing through the first voltage divider circuit 100 minus the current flowing through the second voltage divider circuit 200. I can.

The controller 400 may diagnose whether the insulation of the battery is destroyed by using the battery leakage current IL calculated as described above. For example, when the calculated battery leakage current IL is equal to or greater than a predetermined reference current value, the controller 400 may diagnose that the insulation of the battery is destroyed.

Meanwhile, the insulation diagnosis apparatus according to an embodiment of the present invention may further include a storage unit. The storage unit may store programs and data necessary for the controller 400 to diagnose the insulation resistance measurement circuit. That is, the storage unit may store data required for each component of the apparatus for diagnosing an insulation resistance measurement circuit according to an embodiment of the present invention to perform an operation or function, a program, or data generated in a process of performing an operation and function. . For example, the storage unit may store data necessary for the control unit 400 to diagnose whether the battery has an insulation breakdown, for example, a reference current value to be compared with a leakage current.

There is no particular limitation on the type of the storage unit as long as it is a known information storage means known to be capable of recording, erasing, updating, and reading data. As an example, the information storage means may include RAM, flash memory, ROM, EEPROM, register, and the like. In addition, the storage unit may store program codes in which processes executable by the control unit 400 are defined.

In addition, the battery insulation diagnosis apparatus according to the present invention may further include a positive electrode diagnosis resistor 500 and a negative electrode diagnosis resistor 600 as shown in FIG. 1. This will be described with further reference to FIGS. 4 and 5.

4 is a diagram schematically illustrating a configuration of a battery pack including a battery insulation diagnostic device according to another embodiment of the present invention, and FIG. 5 is a diagram illustrating an example of a circuit configuration to which the battery insulation diagnostic device of FIG. 4 is applied. Hereinafter, parts that are different from the previous embodiments will be mainly described, and detailed descriptions of parts to which the description of the previous embodiments may be applied in the same or similar manner will be omitted.

4 and 5, the positive diagnosis resistor 500 may be positioned between the positive terminal C+ of the battery cell 1 and the ground. That is, the positive electrode diagnostic resistor 500 may be provided in a path connecting a node N1 ′ on the positive charge/discharge path P+ of the battery pack to the ground. In particular, the anode diagnosis resistor 500 may be connected in parallel with the first voltage divider circuit 100 as shown in the drawing. Hereinafter, in order to distinguish it from the first voltage distribution path D1, a path provided with the positive electrode diagnosis resistor 500 may be referred to as a positive electrode diagnosis path D+. On the other hand, the node N1' between the anode diagnosis path D+ and the anode charge/discharge path P+ is a circuit with a node N1 between the first voltage distribution path D1 and the anode charge/discharge path P+. It can be the same node.

In addition, the negative diagnosis resistor 600 may be positioned between the negative terminal C- of the battery cell 1 and the ground. That is, the negative diagnosis resistor 600 may be provided in a path connecting one node N2 ′ on the negative charge/discharge path P- of the battery pack to the ground. In particular, the cathode diagnosis resistor 600 may be connected in parallel with the second voltage divider circuit 200 as shown in FIG. 2. Hereinafter, in order to distinguish it from the second voltage distribution path D2, a path provided with the cathode diagnosis resistor 600 may be referred to as a cathode diagnosis path D-. Meanwhile, a node N2' between the cathode diagnosis path D- and the cathode charge/discharge path P- is a node N2 between the first voltage distribution path D2 and the cathode charge/discharge path P- It may be the same node as and circuitly.

In this configuration, the control unit 400 uses a current flowing through the anode diagnosis resistor and the cathode diagnosis resistor 600 together with the current flowing through the first voltage divider circuit 100 and the second voltage divider circuit 200. Thus, the battery leakage current can be calculated. In particular, the control unit 400 is a difference between the current flowing through the first voltage divider circuit 100 and the current flowing through both the second voltage divider circuit 200, the positive diagnosis resistor 500, and the negative diagnosis resistor 600. By calculating the leakage current, it is possible to diagnose whether or not the insulation of the battery is destroyed.

More specifically, referring to the configuration shown in FIG. 5, the current flowing through the first voltage divider 100 is Id1, the current flowing through the second voltage divider 200 is Id2, and the anode diagnosis resistor 500 flows. The current may be referred to as Idp, and the current flowing through the cathode diagnostic resistor 600 may be referred to as Idn. In addition, the leakage current flowing through the positive terminal side may be referred to as ILp, and the leakage current flowing through the negative terminal side may be referred to as ILn.

Here, the relationship between the leakage current and the current flowing through each circuit or element can be expressed as Equation 4 below.

(Equation 4)

IL = ILp + ILn = Id1-Id2-Idp-Idn

Here, IL is the battery leakage current, the flow direction of Idp is the direction from the ground toward the positive charge/discharge path (P+) of the battery pack, and the flow direction of Idn is the negative charge/discharge path (P-) of the battery pack from the ground. It can be a direction to the direction. In addition, the current directions of Id1, Id2, ILp, and ILn are the same as the flow directions of each current in the embodiment of FIG. 3.

As described in Equation 4, the total leakage current flowing through the positive and negative terminals of the battery is from the current flowing through the first voltage divider circuit 100, the current flowing through the second voltage divider circuit 200, and the positive electrode. It may be said to be equal to a value obtained by subtracting the sum of the current flowing through the diagnosis resistor 500 and the current flowing through the cathode diagnosis resistor 600.

In addition, the controller 400 may diagnose whether the insulation of the battery is destroyed by using the leakage current of the battery calculated as described above.

In Equation 4, Id1 and Id2 may be calculated using Equations 1 and 2 described in the embodiment of FIG. 3 above.

In addition, the current Idp flowing through the anode diagnosis resistor 500 may be calculated by Equation 5 below.

(Equation 5)

Idp=-(Vcp / Rp)

Here, Vcp is the voltage of the positive terminal of the battery cell 1 and may be referred to as a voltage between the node N1' and the ground in FIG. 5. In addition, this Vcp may be referred to as a voltage applied to the positive pack terminal of the battery pack. In Vcp, the positive terminal side of the battery cell 1 may have a positive potential and the ground side may have a negative potential. In addition, Rp may be referred to as a resistance value of the positive electrode diagnosis resistor 500. For example, the anode diagnosis resistor 500 may be implemented as a resistance element having a resistance value of 6 MΩ. In this case, Rp may be input as 6 MΩ in Equation 5 above.

In addition, the current Idn flowing through the cathode diagnostic resistor 600 may be calculated by Equation 6 below.

(Equation 6)

Idn = (Vcn/Rn)

Here, Vcn is the negative terminal voltage of the battery cell 1 and may be referred to as a voltage between the node N2' and the ground in FIG. 5. In addition, this Vcn may be referred to as a voltage applied to the negative pack terminal of the battery pack. For Vcn, the ground side may have a positive potential and the negative terminal side of the battery cell 1 may have a negative potential. It can be said that the sum of the positive terminal voltage Vcn of the high voltage battery cell 1 and the negative terminal voltage Vcp of the battery cell 1 is equal to the voltage Vpack at both ends of the battery cell 1. That is, the relationship of Vcp+Vcn = Vpack can be established. In addition, Rn may be referred to as a resistance value of the negative electrode diagnosis resistor 600. For example, the cathode diagnosis resistor 600 may be implemented as a resistance element having a resistance value of 6 MΩ. In this case, Rn may be input as 6 MΩ in Equation 6 above. The resistance value of the anode diagnosis resistor 500 and the resistance value of the cathode diagnosis resistor 600 may be previously stored in a storage unit or the like. In addition, the control unit 400 may read resistance values of the positive electrode diagnosis resistor 500 and the negative electrode diagnosis resistor 600 stored in the storage unit as described above.

In the above embodiment, the positive electrode diagnosis resistor 500 and the negative electrode diagnosis resistor 600 are resistance elements having appropriate resistance values in consideration of the specifications of the battery cell 1 or the battery pack, and the specifications of the device to which the battery pack is applied. Can be implemented as In particular, the positive electrode diagnosis resistor 500 and the negative electrode diagnosis resistor 600 may be configured to have lower values than the first and second distribution resistors 110 and 210. For example, as in the above embodiment, a first voltage divider circuit 100 and a second voltage divider circuit as a resistance element having a resistance value of 8㏁ of the first divider resistor 110 and the second divider resistor 210 When included in 200, the positive electrode diagnosis resistor 500 and the negative electrode diagnosis resistor 600 are resistance elements having a resistance value of 6 MΩ and may be included in the positive electrode diagnosis path and the negative electrode diagnosis path, respectively.

As described above, according to an exemplary configuration further including the positive electrode diagnosis resistor 500 and the negative electrode diagnosis resistor 600, the measurement range for battery insulation diagnosis is narrowed, so that the accuracy for battery insulation diagnosis may be improved. That is, according to the above implementation, the resistance in the first distribution circuit and the positive diagnosis resistor 500 are connected in parallel, and the resistance in the second distribution circuit and the negative diagnosis resistor 600 are connected in parallel, so that the total resistance is low. As a result, the measurement range may be narrowed during the insulation diagnosis process.

In the above embodiment, the positive electrode diagnosis resistor 500 and the negative electrode diagnosis resistor 600 may be configured to have the same resistance value. For example, in the configuration of FIG. 5, when the positive electrode diagnosis resistor 500 has a resistance value of 6 MΩ, the negative electrode diagnosis resistor 600 may also have a resistance value of 6 MΩ.

According to this configuration of the present invention, by making the resistance values of the positive terminal side and the negative terminal side of the battery cell 1 symmetrical to each other, control or calculation for battery insulation diagnosis can be facilitated. In addition, according to this configuration, the resistance value of one terminal side of the battery pack is low, and leakage current can be prevented from flowing to the corresponding terminal side. Moreover, when the resistance values between the terminals of the battery pack are different, leakage current tends to flow in a direction with a low resistance value, and there is a fear that the insulation of the battery may be weakened. However, according to the above configuration, such a problem can be prevented. Also, for similar reasons, the first distribution resistor 110 and the second distribution resistor 210 may be implemented as resistance elements having the same resistance values. In addition, the first reference resistor 120 and the second reference resistor 220 may also be implemented as resistance elements having the same resistance values.

Meanwhile, the positive terminal voltage Vcp of the battery cell 1 and/or the negative terminal voltage Vcn of the battery cell 1 may be measured by the voltage detector 300. In addition, the voltage detector 300 may transmit the measured positive terminal voltage and negative terminal voltage to the controller 400. Then, the control unit 400 can calculate the current flowing through the positive electrode diagnosis resistor 500 and/or the negative electrode diagnosis resistor 600 using the received positive terminal voltage (Vcp) and/or negative terminal voltage (Vcn). have.

As another example, the controller 400 may calculate the positive terminal voltage Vcp in the same manner as in Equation 7 below.

(Equation 7)

Vcp = Vc1 + (Vc1/Rref1)×Rd1

Here, Vc1 is a first diagnostic voltage, Rref1 is a resistance value of the first reference resistor 120, and Rd1 is a resistance value of the first distribution resistor 110, respectively. In addition, the resistance value Rref1 of the first reference resistor 120 and/or the resistance value Rd1 of the first distribution resistor 110 may be previously stored in a storage unit such as a memory.

That is, the control unit 400 includes a first diagnostic voltage Vc1 measured and transmitted by the voltage detection unit 300 and a resistance value Rref1 and a first distribution of the first reference resistance 120 previously stored in the storage unit. The positive terminal voltage Vcp of the battery cell 1 may be calculated using the resistance value Rd1 of the resistor 110.

In addition, the control unit 400 may calculate the negative terminal voltage Vcn in the same manner as in Equation 8 below.

(Equation 8)

Vcn = (Vref-Vc2) + (Vref-Vc2)/Rref2 × Rd2-Vref

Here, Vref is the voltage value of the reference power supply 230, Vc2 is the second diagnostic voltage, Rref2 is the resistance value of the second reference resistor 220, and Rd2 is the resistance value of the second distribution resistor 210, respectively. Show. In addition, the voltage value Vref of the reference power supply 230, the resistance value Rd2 of the second reference resistor 220, and/or the resistance value Rd2 of the second distribution resistor 210 are stored in a storage unit such as a memory. It can be stored in advance on the back.

That is, the control unit 400 includes a second diagnostic voltage Vc2 measured and transmitted by the voltage detection unit 300, a reference voltage value Vref of the reference power supply 230 previously stored in the storage unit, and a second reference resistance. The negative terminal voltage Vcn of the battery cell 1 may be calculated using the resistance value Rref2 of 220 and the resistance value Rd2 of the second distribution resistor 210.

According to this embodiment of the present invention, for battery insulation diagnosis, the positive terminal voltage and/or the negative terminal voltage of the battery cell 1 need not be separately measured. For example, the voltage detector 300 only needs to measure a first diagnostic voltage and a second diagnostic voltage, and does not need to separately measure a positive terminal voltage and a negative terminal voltage. Therefore, according to this configuration of the present invention, the circuit configuration of the voltage detection unit 300 and the battery insulation diagnosis apparatus can be made simpler.

In addition, the control unit 400 may compare the voltage of the positive terminal of the battery cell 1 and the voltage of the negative terminal of the battery cell 1 to determine the location of the insulation breakdown of the battery.

For example, in the embodiment of FIG. 5, when the positive terminal voltage Vcp of the battery cell 1 is less than the negative terminal voltage Vcn, the location where the insulation of the battery is broken is from the battery cell 1 to It can be said to be the positive terminal side of the battery pack.

Alternatively, in the embodiment of FIG. 5, when the positive terminal voltage Vcp of the battery cell 1 is greater than the negative terminal voltage Vcn, the location where the insulation of the battery is broken is the battery cell 1 to the battery pack. It can be said that the negative terminal side of.

In this embodiment, when the location of the insulation breakdown of the battery is determined to be on the positive terminal side of the battery cell 1, the control unit 400 determines the insulation resistance on the positive terminal side of the battery using the battery leakage current and the first diagnosis voltage. Can be estimated. This will be described in more detail with reference to FIG. 6.

6 is a diagram schematically illustrating a circuit configuration when insulation on a positive terminal side is destroyed in a battery pack including a battery insulation diagnosis apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 6, when the insulation of the battery pack is destroyed at the positive terminal side of the battery cell 1, the circuit may be configured such that insulation resistance exists only at the positive terminal side. In this case, the insulation resistance of the positive terminal side of the battery may be expressed as in Equation 9 below.

(Equation 9)

RLp = Vcp / IL

Here, RLp is the insulation resistance value of the positive terminal of the battery, Vcp is the voltage of the positive terminal of the battery, and IL is the leakage current of the battery.

In this case, Vcp may be calculated by the controller 400 based on Equation 7. That is, the control unit 400 includes the first diagnosis voltage Vc1 measured by the voltage detector 300, the resistance value Rd1 of the first distribution resistor 110, which is a value stored in advance, and the first reference resistance 120. The positive terminal voltage Vcp of the battery can be obtained by using the resistance value Rref1 of ). In addition, by dividing the obtained positive terminal voltage Vcp by the leakage current IL, the insulation resistance RLp of the positive terminal side of the battery can be estimated. The battery leakage current IL may be calculated by the controller 400 based on Equation 3 or 4 above.

Particularly, if Equation 4 and Equation 7 are substituted for Equation 9, it can be summarized as Equation 10 below.

(Equation 10)

RLp = (Vc1 + (Vc1/Rref1)×Rd1) / (Id1-Id2-Idp-Idn)

In addition, when the position of the insulation breakdown of the battery is determined to be the negative terminal side of the battery cell 1, the control unit 400 determines the insulation resistance of the negative terminal side of the battery using the battery leakage current, the second diagnostic voltage, and the reference voltage. Can be estimated. This will be described in more detail with reference to FIG. 7.

FIG. 7 is a diagram schematically illustrating a circuit configuration when insulation on a negative terminal side is destroyed in a battery pack including an apparatus for diagnosing battery insulation according to an embodiment of the present invention.

Referring to FIG. 7, when the insulation of the battery pack is destroyed at the negative terminal side of the battery cell 1, the circuit may be configured such that insulation resistance exists only at the negative terminal side. In this case, the insulation resistance of the negative terminal side of the battery may be expressed as Equation 11 below.

(Equation 11)

RLn = Vcn / IL

Here, RLn is the insulation resistance value of the negative terminal of the battery, Vcn is the voltage of the negative terminal of the battery, and IL is the leakage current of the battery.

In this case, Vcn may be calculated by the controller 400 based on Equation 8. That is, the control unit 400 includes the second diagnostic voltage Vc2 measured by the voltage detector 300, the resistance value Rd2 of the second distribution resistor 210, which is a value stored in advance, and the second reference resistance 220. The negative terminal voltage Vcn of the battery may be obtained by using the resistance value Rref2 of) and the reference voltage value Vref supplied by the reference power supply 230. In addition, by dividing the thus obtained negative terminal voltage Vcn by the leakage current IL, the insulation resistance RLn at the negative terminal side of the battery can be estimated. The battery leakage current IL may be calculated by the controller 400 based on Equation 3 or 4 above.

In particular, if Equation 4 and Equation 8 are substituted for Equation 11, it can be summarized as Equation 12 below.

(Equation 12)

RLp = ((Vref-Vc2) + (Vref-Vc2)/Rref2 × Rd2-Vref) / (Id1-Id2-Idp-Idn)

As in the above embodiment, when the insulation resistance of the positive terminal side of the battery or the insulation resistance of the negative terminal side of the battery is estimated, the control unit 400 uses the estimated insulation resistance value to determine whether the battery is damaged or whether the battery is insulated. The degree of destruction can be diagnosed.

For example, the control unit 400 may compare the estimated insulation resistance value and the reference resistance value to diagnose whether the battery has insulation breakdown. Here, the reference resistance value may be stored in advance as a specific value or a specific range in the storage unit or the like. In particular, when the estimated insulation resistance value is less than or equal to the reference resistance value, the control unit 400 may determine that the insulation of the battery is destroyed. Alternatively, the control unit 400 may calculate a difference between the estimated insulation resistance value and the reference resistance value, and determine to what extent insulation of the battery is destroyed by using the calculated difference.

The controller 400 may compare the current Id1 flowing through the first voltage divider circuit 100 and/or the current Id2 flowing through the second voltage divider circuit 200 with a reference value. To this end, the storage unit may store a reference value for comparison with the current Id1 flowing through the first voltage divider circuit 100 and/or the current Id2 flowing through the second voltage divider circuit 200. In addition, the controller 400 may compare the reference value stored in the storage unit with the current value calculated by Equation 1 and/or Equation 2. For example, the controller 400 may compare the current Id1 that flows through the one voltage divider circuit 100 calculated based on Equation 1 with a reference value previously stored in the storage unit. And, based on the result of the comparison, it can be used to determine the leakage current.

In particular, the control unit 400 is calculated that the current Id1 flowing through the first voltage divider circuit 100 and the current Id2 flowing through the second voltage divider circuit 200 are the same or within a range within a certain error. If so, the calculated value can be compared with the reference value. For example, the controller 400 has the same current Id1 flowing through the first voltage divider circuit 100 and the current Id2 flowing through the second voltage divider circuit 200, based on Equation 3 above. Thus, when the calculated leakage current IL becomes 0, an operation of comparing the calculated value with a reference value may be performed.

In addition, when the calculated value is smaller than the reference value or within the reference value range, the controller 400 may determine that there is no total leakage current IL. On the other hand, when the calculated value is greater than the reference value or out of the reference value range, the controller 400 may determine that there is a total leakage current IL. For example, when Id1 is the same as Id2, but Id1 is less than the current (reference value) flowing through the first voltage divider 100 in a normal state, the controller 400 may determine that a leakage current exists in the battery. have.

In particular, the control unit 400, although the leakage current IL based on Equation 3 is 0 or within a certain level, but the current Id1 flowing through the first voltage divider circuit 100 or the second voltage divider circuit 200 When the current Id2 flowing in is out of the reference value or the reference range, it may be determined that both the insulation resistance of the anode terminal and the insulation resistance of the cathode terminal are destroyed.

According to this configuration of the present invention, although both the insulation resistance of the anode terminal and the insulation resistance of the cathode terminal are destroyed, it can be prevented from determining that there is no leakage current. In particular, when determining the battery leakage current based on Equation 3, when both the insulation resistance of the positive terminal side and the insulation resistance of the negative terminal are destroyed and the insulation resistance is formed at a similar level, the leakage according to Equation 3 Although the current IL may be determined to be 0, even in this case, it may be accurately detected that the insulation resistance is destroyed.

Meanwhile, when it is diagnosed whether the battery insulation is destroyed, the controller 400 may transmit the diagnosis result to the user. Alternatively, the control unit 400 may perform an operation for securing the safety of the battery by using the diagnosis result. For example, when it is diagnosed that the insulation of the battery is broken, the control unit 400 turns off a switch provided in the charge/discharge path of the battery pack, so that an electric shock accident due to a short circuit of the battery pack or a battery pack or a battery It is possible to prevent damage to the device to which the pack is applied, such as a car.

The battery pack according to the present invention may include the battery insulation diagnosis apparatus according to the present invention described above. In particular, in the battery pack according to the present invention, at least some components of the battery insulation diagnosis apparatus, such as the control unit 400, may be implemented by a BMS provided in a conventional battery pack. In addition, the battery pack according to the present invention may further include a battery cell 1 provided with one or more secondary batteries, an electric device (relay, fuse, etc.), a pack case, etc., in addition to the battery insulation diagnosis device.

In addition, the battery insulation diagnostic device according to the present invention can be mounted on a vehicle, particularly an electric vehicle. That is, the vehicle according to the present invention may include the battery insulation diagnosis apparatus according to the present invention. Here, the battery insulation diagnosis device may be included in the battery pack, but at least some components may be implemented as a device separate from the battery pack. For example, the control unit 400 of the battery insulation diagnosis apparatus may be implemented by an electronic control unit (ECU) provided on a vehicle side. In addition, the vehicle according to the present invention may include a vehicle body or electronic equipment conventionally provided in a vehicle, in addition to such a battery insulation diagnostic device. For example, the vehicle according to the present invention may include a battery, a contactor, an inverter, a motor, one or more ECUs, etc., in addition to the battery insulation diagnosis apparatus according to the present invention. However, the present invention is not particularly limited to other components of a vehicle other than the battery insulation diagnosis device.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.

Meanwhile, in the present specification, the term'unit' is used, such as'voltage detection unit','control unit', etc., but this refers to a logical constituent unit, and refers to a component that can be physically separated or must be physically separated. It is obvious to those skilled in the art to which the present invention pertains.

That is, since each configuration in the present invention corresponds to a logical component in order to realize the technical idea of the present invention, even if each component is integrated or separated, if the functions performed by the logical configuration of the present invention can be realized. It should be construed to be within the scope of the present invention, and elements that perform the same or similar functions should be construed as within the scope of the present invention regardless of whether or not the names coincide with each other.

1: battery cell
10: anode insulation resistance, 20: cathode insulation resistance
100: first voltage distribution circuit
110: first distribution resistance, 120: first reference resistance
200: second voltage distribution circuit
210: second distribution resistance, 220: second reference resistance, 230: reference power
300: voltage detection unit
400: control unit
500: bipolar diagnostic resistance
600: cathode diagnostic resistance

Claims (11)

A first voltage divider circuit positioned between a positive terminal of a battery cell and a ground, having a first divider resistor and a first reference resistor connected in series with each other, and directly connected to a charge/discharge path of the battery cell;
A second voltage distribution circuit positioned between the negative terminal of the battery cell and the ground, having a second distribution resistor, a second reference resistance, and a reference power connected in series with each other, and directly connected to a charge/discharge path of the battery cell;
A voltage detector configured to measure a first diagnosis voltage between the first distribution resistor and the first reference resistance, and a second diagnosis voltage between the second distribution resistance and the second reference resistance; And
A control unit for diagnosing whether a battery is damaged by using the first and second diagnosis voltages measured by the voltage detector, and current flowing through the first voltage divider circuit and the second voltage divider circuit.
Battery insulation diagnostic device comprising a. The method of claim 1,
The control unit calculates a leakage current as a difference between the current flowing through the first voltage divider circuit and the second voltage divider circuit, and diagnoses whether the battery is damaged by using the calculated leakage current. Battery insulation diagnostic device. The method of claim 1,
A positive electrode diagnosis resistor positioned between the positive terminal of the battery cell and the ground, and connected in parallel with the first voltage divider circuit; And
A negative diagnostic resistor located between the negative terminal of the battery cell and the ground and connected in parallel with the second voltage divider circuit
Battery insulation diagnostic device, characterized in that it further comprises. The method of claim 3,
The positive electrode diagnosis resistor and the negative electrode diagnosis resistor have the same resistance value. The method of claim 3,
The controller calculates a battery leakage current as a difference between a current flowing through the first voltage divider circuit and a current flowing through both the second voltage divider circuit, the positive electrode diagnosis resistor, and the negative electrode diagnosis resistor, and the calculated battery leakage current Battery insulation diagnosis device, characterized in that diagnosing whether the insulation breakdown of the battery by using. The method of claim 5,
The controller calculates a current flowing through the positive diagnostic resistor using the positive terminal voltage of the battery cell and the resistance value of the positive diagnostic resistor, and uses the negative terminal voltage of the battery cell and the resistance value of the negative diagnostic resistor. And calculating the current flowing through the negative electrode diagnosis resistor. The method of claim 1,
The control unit compares the voltage of the positive terminal of the battery cell with the voltage of the negative terminal of the battery cell to determine the location of the insulation breakdown of the battery. The method of claim 7,
The control unit, when it is determined that the insulation breakdown position of the battery is toward the positive terminal of the battery cell, estimates the insulation resistance of the positive terminal of the battery using a battery leakage current and the first diagnostic voltage. Insulation diagnostic device. The method of claim 7,
When it is determined that the insulation breakdown position of the battery is toward the negative terminal of the battery cell, the control unit uses a battery leakage current, the second diagnostic voltage, and a reference voltage supplied by the reference power to the negative terminal of the battery. Battery insulation diagnostic device, characterized in that estimating side insulation resistance. A battery pack comprising the battery insulation diagnostic device according to any one of claims 1 to 9. A vehicle comprising the battery insulation diagnostic device according to any one of claims 1 to 9.

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