Apparatus and method for diagnosing negative electrode contactor of battery pack
阅读说明:本技术 诊断电池组的负电极接触器的装置和方法 (Apparatus and method for diagnosing negative electrode contactor of battery pack ) 是由 宋正柱 于 2018-12-11 设计创作,主要内容包括:公开了一种用于诊断在电池组的正电极接触器中发生的短路的设备和方法。根据本发明的用于诊断电池组的正电极接触器的装置,包括:设置在连接至正电极端子的充电-放电路径上的正电极接触器;以及,设置在连接至负电极的充电-放电路径上的负电极接触器。(Disclosed are an apparatus and a method for diagnosing a short circuit occurring in a positive electrode contactor of a battery pack. The apparatus for diagnosing a positive electrode contactor of a battery pack according to the present invention includes: a positive electrode contactor disposed on a charge-discharge path connected to the positive electrode terminal; and a negative electrode contactor disposed on a charge-discharge path connected to the negative electrode.)
1. An apparatus for diagnosing a positive electrode contactor of a battery pack, wherein the battery pack comprises: the positive electrode contactor disposed on a charge-discharge path connected to a positive electrode terminal of the battery pack; and a negative electrode contactor provided on a charge-discharge path connected to a negative electrode terminal of the battery pack, the apparatus including:
a first voltage measurement unit connected between ground and a first node to which a positive electrode terminal of a battery module included in the battery pack and one end of the positive electrode contactor are commonly connected, wherein the first voltage measurement unit is configured to measure a first measurement voltage applied between the first node and the ground;
a second voltage measuring unit connected between the ground and a second node to which a negative electrode terminal of the battery module and one end of the negative electrode contactor are commonly connected, wherein the second voltage measuring unit is configured to measure a second measurement voltage applied between the second node and the ground;
a positive electrode protection capacitor located between the ground and the positive electrode terminal of the battery pack;
a negative electrode protection capacitor located between the ground and the negative electrode terminal of the battery pack; and
a diagnostic unit having a plurality of diagnostic circuits configured to selectively connect two of the first node, the second node, a third node, a fourth node, and the ground, the other end of the positive electrode contactor and one end of the positive electrode protection capacitor being commonly connected to the third node, the other end of the negative electrode contactor and one end of the negative electrode protection capacitor being commonly connected to the fourth node,
wherein the diagnostic unit is configured to:
measuring a first diagnostic voltage applied between the third node and the second node, a second diagnostic voltage applied to the positive electrode protection capacitor, and a third diagnostic voltage applied to the negative electrode protection capacitor;
diagnosing whether the battery module leaks electricity by using the first measured voltage and the second measured voltage, an
Diagnosing whether the positive electrode contactor is short-circuited by using at least one of the first diagnostic voltage, the second diagnostic voltage, and the third diagnostic voltage.
2. The apparatus for diagnosing a positive electrode contactor of a battery pack according to claim 1,
wherein the diagnostic unit comprises:
a first diagnostic circuit connected between the third node and the second node to measure the first diagnostic voltage between the third node and the second node;
a second diagnostic circuit connected between the third node and the ground to measure the second diagnostic voltage between the third node and the ground; and
a third diagnostic circuit connected between the fourth node and the ground to measure the third diagnostic voltage between the fourth node and the ground.
3. The apparatus for diagnosing a positive electrode contactor of a battery pack according to claim 2,
wherein the first diagnostic circuit includes a third voltage dividing circuit having a third protection resistor and a third detection resistor for dividing the first diagnostic voltage, and a third switch; the third switch is used for applying a voltage to the third voltage dividing circuit in response to a control signal output from the diagnostic circuit,
wherein the second diagnostic circuit includes a fourth voltage dividing circuit having a fourth protection resistor and a fourth detection resistor for dividing the second diagnostic voltage, and a fourth switch; the fourth switch is for applying a voltage to the fourth voltage dividing circuit in response to a control signal output from the diagnostic circuit, and
wherein the third diagnostic circuit includes a fifth voltage-dividing circuit having a fifth protection resistor and a fifth detection resistor for dividing the third diagnostic voltage, and a fifth switch; the fifth switch is configured to apply a voltage to the fifth voltage dividing circuit in response to a control signal output from the diagnostic circuit.
4. The apparatus for diagnosing a positive electrode contactor of a battery pack according to claim 3,
the first voltage measuring unit comprises a first voltage dividing circuit and a first switch, wherein the first voltage dividing circuit is provided with a first protection resistor and a first detection resistor and is used for dividing the first measuring voltage; the first switch is used for applying a voltage to the first voltage dividing circuit in response to a control signal output from the diagnostic circuit,
the second voltage measuring unit comprises a second voltage dividing circuit and a second switch, wherein the second voltage dividing circuit is provided with a second protection resistor and a second detection resistor and is used for dividing the second measuring voltage; the second switch is used for applying a voltage to the second voltage division circuit in response to a control signal output from the diagnostic circuit.
5. The apparatus for diagnosing a positive electrode contactor of a battery pack according to claim 4,
wherein the diagnostic unit is configured to:
controlling the first switch and the third switch to a closed state during a first switching cycle;
controlling the second switch to an open state during the first switching cycle,
controlling the first switch to an open state during a second switching cycle,
controlling the second switch and the third switch to a closed state during the second switching cycle, and
measuring the first, second, and third diagnostic voltages during the first and second switching cycles.
6. The apparatus for diagnosing a positive electrode contactor of a battery pack according to claim 5,
wherein the diagnostic unit is configured to: diagnosing that the positive electrode contactor is in a normal state without a short circuit when the first diagnostic voltage has a positive value and an absolute value of the first diagnostic voltage gradually decreases during the first switching cycle, and when the first diagnostic voltage has a negative value and the absolute value of the first diagnostic voltage gradually decreases during the second switching cycle.
7. The apparatus for diagnosing a positive electrode contactor of a battery pack according to claim 5,
wherein the diagnostic unit is configured to: determining that the positive electrode contactor is in a fault state with a short circuit when the first diagnostic voltage has a positive value and is continuously maintained during the first and second switching cycles.
8. The apparatus for diagnosing a positive electrode contactor of a battery pack according to claim 7.
Wherein the diagnostic unit is configured to: determining that the positive electrode contactor is in a fault state with a short circuit when the second diagnostic voltage has a value of 0 or more and a difference between a voltage value of the second diagnostic voltage and a voltage value of the third diagnostic voltage gradually decreases during the first and second switching cycles.
9. A battery pack comprising the apparatus for diagnosing a positive electrode contactor of a battery pack according to any one of claims 1 to 8.
10. A method for diagnosing a positive electrode contactor of a battery pack, wherein the battery pack comprises: the positive electrode contactor disposed on a charge-discharge path connected to a positive electrode terminal of the battery pack; and a negative electrode contactor provided on the charge-discharge path connected to a negative electrode terminal of the battery pack, the method comprising:
measuring a first measurement voltage applied between a ground and a first node and a second measurement voltage applied between the ground and a second node, a positive electrode terminal of a battery module included in the battery pack and one end of the positive electrode contactor being commonly connected to the first node, a negative electrode terminal of the battery module and one end of the negative electrode contactor being commonly connected to the second node;
measuring a first diagnostic voltage applied between the second node and a third node, a second diagnostic voltage applied to a positive electrode protection capacitor between the ground and the positive electrode terminal of the battery pack, and a third diagnostic voltage applied to a negative electrode protection capacitor between the ground and the negative electrode terminal of the battery pack, the other end of the positive electrode contactor and one end of the positive electrode protection capacitor being commonly connected to the third node; and
diagnosing whether the battery module is electrically leaked by using the first and second measured voltages, and diagnosing whether the positive electrode contactor is short-circuited by using at least one of the first, second, and third diagnostic voltages.
Technical Field
The present application claims priority to korean patent application No. 10-2017-.
The present disclosure relates to an apparatus and method for diagnosing a positive electrode contactor of a battery pack, and more particularly, to an apparatus and method for diagnosing a short circuit occurring at a positive electrode contactor of a battery pack.
Background
Recently, the demand for portable electronic products such as notebook computers, camcorders, and portable phones has sharply increased, and energy storage batteries, robots, satellites, and the like have been seriously developed. Therefore, a high-performance secondary battery that allows repeated charging and discharging is being actively studied.
Therefore, as technologies of mobile devices, electric vehicles, hybrid electric vehicles, power storage systems, and uninterruptible power supplies are developed and demand therefor is increased, demand for secondary batteries as energy sources is rapidly increased. In particular, secondary batteries used for electric vehicles or hybrid electric vehicles are high-power, large-capacity secondary batteries, and are being intensively studied.
In addition, with the great demand for secondary batteries, peripheral components and devices related to the secondary batteries are also being researched together. That is, various components and devices, such as a battery module prepared by connecting a plurality of secondary batteries, a BMS for controlling the charge and discharge of the battery module and monitoring the state of each secondary battery, a battery pack prepared by packaging the battery module and the BMS, and a contactor for connecting the battery module to a load, such as a motor, are being studied.
In particular, the contactor is a switch that connects the battery module and the load and controls the supply of power. For example, the operating voltage of a lithium ion secondary battery widely used in the art is about 3.7V to 4.2V. In order to provide a high voltage, a plurality of secondary batteries are connected in series to form a battery module. In the case of a battery module for an electric vehicle or a hybrid electric vehicle, a motor for driving the vehicle requires a battery voltage of about 240V to 280V. Here, high voltage high power electric power always passes through a contactor connecting the battery module and the motor, and thus it is very important to monitor whether the contactor has a fault.
Meanwhile, various devices requiring electric energy, such as electric vehicles, basically include an electric power system. The power system selectively opens and closes at least one contactor to stably supply power between the battery and the load.
Regarding the safety of the power system, it is necessary to diagnose two types of accidents. One is an electric leakage accident of the battery, and the other is a short-circuit accident of the contactor. If an electrical leakage occurs, the user may get an electric shock. If a short circuit occurs, there is a risk of sudden unexpected acceleration.
Although a technique for diagnosing an electric leakage accident and a technique for diagnosing a short-circuit accident are separately disclosed in the prior art, there is no prior art for simultaneously diagnosing both types of accidents.
If the leakage accident and the short-circuit accident are not diagnosed at the same time, a serious safety problem may be caused. For example, if the diagnosis of the short-circuit accident is started only after the leakage accident is completely diagnosed, it is impossible to promptly notify the user of the occurrence of the short-circuit accident.
Further, even in the case where a short-circuit accident of the contactor is diagnosed, it is required to accurately diagnose a specific contactor in which the short-circuit accident occurs among the plurality of contactors. For example, if a battery pack has a positive electrode contactor and a negative electrode contactor, and a short-circuit accident occurs in the positive electrode contactor, it is necessary to accurately diagnose the occurrence of the short-circuit accident at the positive electrode contactor and accurately notify a user of the diagnosis result.
Disclosure of Invention
Technical problem
The present disclosure is designed to solve the problems of the related art, and therefore, the present disclosure is directed to providing an apparatus and method for diagnosing a positive electrode contactor of a battery pack, which can determine whether a short circuit occurs at the positive electrode contactor while performing a function of determining whether a leakage current occurs at a battery module.
These and other objects and advantages of the present disclosure will be understood from the following detailed description, and will become more apparent in light of the exemplary embodiments of the present disclosure. Also, it will be readily understood that the objects and advantages of the present disclosure may be realized by the means as set forth in the appended claims and combinations thereof.
Technical solution
In one aspect of the present disclosure, there is provided an apparatus for diagnosing a positive electrode contactor of a battery pack, wherein the battery pack includes: the positive electrode contactor disposed on a charge-discharge path connected to a positive electrode terminal of the battery pack; and a negative electrode contactor provided on a charge-discharge path connected to a negative electrode terminal of the battery pack, the apparatus including: a first voltage measurement unit connected between ground and a first node to which a positive electrode terminal of a battery module included in the battery pack and one end of the positive electrode contactor are commonly connected, wherein the first voltage measurement unit is configured to measure a first measurement voltage applied between the first node and the ground; a second voltage measuring unit connected between ground and a second node to which a negative electrode terminal of the battery module and one end of the negative electrode contactor are commonly connected, wherein the second voltage measuring unit is configured to measure a second measurement voltage applied between the second node and the ground; a positive electrode protection capacitor located between the ground and the positive electrode terminal of the battery pack; a negative electrode protection capacitor located between the ground and the negative electrode terminal of the battery pack; and a diagnostic unit having a plurality of diagnostic circuits configured to selectively connect two points of the first node, the second node, a third node, a fourth node, and the ground, the other end of the positive electrode contactor and one end of the positive electrode protection capacitor being commonly connected to the third node, the other end of the negative electrode contactor and one end of the negative electrode protection capacitor being commonly connected to the fourth node. The diagnostic unit is configured to: measuring a first diagnostic voltage applied between the third node and the second node, a second diagnostic voltage applied to the positive electrode protection capacitor, and a third diagnostic voltage applied to the negative electrode protection capacitor. The diagnostic unit is configured to: diagnosing whether the battery module leaks electricity by using the first measured voltage and the second measured voltage. The diagnostic unit is configured to: diagnosing whether the positive electrode contactor is short-circuited by using at least one of the first diagnostic voltage, the second diagnostic voltage, and the third diagnostic voltage.
Further, the diagnosis unit may include: a first diagnostic circuit connected between the third node and the second node to measure the first diagnostic voltage between the third node and the second node; a second diagnostic circuit connected between the third node and the ground to measure the second diagnostic voltage between the third node and the ground; and a third diagnostic circuit connected between the fourth node and the ground to measure the third diagnostic voltage between the fourth node and the ground.
Further, the first diagnostic circuit may include a third voltage dividing circuit having a third protection resistor and a third detection resistor for dividing the first diagnostic voltage, and a third switch; the third switch is used for applying a voltage to the third voltage division circuit in response to a control signal output from the diagnostic circuit, and the second diagnostic circuit may include a fourth voltage division circuit having a fourth protection resistor and a fourth detection resistor for dividing the second diagnostic voltage, and a fourth switch; the fourth switch is configured to apply a voltage to the fourth voltage dividing circuit in response to a control signal output from the diagnostic circuit, and the third diagnostic circuit may include a fifth voltage dividing circuit having a fifth protection resistor and a fifth detection resistor, and a fifth switch configured to divide the third diagnostic voltage; the fifth switch is configured to apply a voltage to the fifth voltage dividing circuit in response to a control signal output from the diagnostic circuit.
Further, the first voltage measuring unit may include a first voltage dividing circuit having a first protection resistor and a first detection resistor for dividing the first measurement voltage, and a first switch; the first switch is used for applying a voltage to the first voltage dividing circuit in response to a control signal output from the diagnostic circuit. The second voltage measuring unit may include a second voltage dividing circuit having a second protection resistor and a second detection resistor for dividing the second measurement voltage, and a second switch; the second switch is used for applying a voltage to the second voltage division circuit in response to a control signal output from the diagnostic circuit.
Furthermore, the diagnostic unit may be configured to: controlling the first switch and the third switch to a closed state during a first switching cycle. The diagnostic unit may be configured to: controlling the second switch to an open state during the first switching cycle. The diagnostic unit may be configured to: controlling the first switch to an open state during a second switching cycle. The diagnostic unit may be configured to: controlling the second switch and the third switch to a closed state during the second switching cycle. The diagnostic unit may be configured to: measuring the first, second, and third diagnostic voltages during the first and second switching cycles.
Additionally, the diagnostic unit may be configured to: diagnosing that the positive electrode contactor is in a normal state without a short circuit when the first diagnostic voltage has a positive value and an absolute value of the first diagnostic voltage gradually decreases during the first switching cycle, and when the first diagnostic voltage has a negative value and the absolute value of the first diagnostic voltage gradually decreases during the second switching cycle.
Furthermore, the diagnostic unit may be configured to: determining that the positive electrode contactor is in a fault state with a short circuit when the first diagnostic voltage has a positive value and is continuously maintained during the first and second switching cycles.
Furthermore, the diagnostic unit may be configured to: determining that the positive electrode contactor is in a fault state with a short circuit when the second diagnostic voltage has a value of 0 or more and a difference between a voltage value of the second diagnostic voltage and a voltage value of the third diagnostic voltage gradually decreases during the first and second switching cycles.
In another aspect of the present disclosure, there is also provided a battery pack including the apparatus for diagnosing a positive electrode contactor of the battery pack according to the present disclosure.
In another aspect of the present disclosure, there is also provided a method for diagnosing a positive electrode contactor of a battery pack, wherein the battery pack includes: the positive electrode contactor disposed on a charge-discharge path connected to a positive electrode terminal of the battery pack; and a negative electrode contactor provided on the charge-discharge path connected to a negative electrode terminal of the battery pack, the method comprising: measuring a first measurement voltage applied between a ground and a first node and a second measurement voltage applied between the ground and a second node, a positive electrode terminal of a battery module included in the battery pack and one end of the positive electrode contactor being commonly connected to the first node, a negative electrode terminal of the battery module and one end of the negative electrode contactor being commonly connected to the second node; measuring a first diagnostic voltage applied between the second node and a third node, a second diagnostic voltage applied to a positive electrode protection capacitor between the ground and the positive electrode terminal of the battery pack, and a third diagnostic voltage applied to a negative electrode protection capacitor between the ground and the negative electrode terminal of the battery pack, the other end of the positive electrode contactor and one end of the positive electrode protection capacitor being commonly connected to the third node; and diagnosing whether the battery module is electrically leaked by using the first and second measured voltages, and diagnosing whether the positive electrode contactor is short-circuited by using at least one of the first, second, and third diagnostic voltages.
Advantageous effects
According to at least one of the embodiments of the present disclosure, the function of determining whether a short circuit occurs at the positive electrode contactor may be performed while the function of determining whether leakage occurs at the battery module is performed. Therefore, the user can be notified more quickly of the information relating to the occurrence of the short-circuit accident.
The present disclosure may have various effects other than the above, and other effects of the present disclosure may be understood from the following description, and may be more clearly understood through embodiments of the present disclosure.
Drawings
The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, serve to provide a further understanding of the technical features of the disclosure, and therefore the disclosure should not be construed as being limited to the accompanying drawings.
Fig. 1 is a diagram schematically showing a functional configuration of a power system including an apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Fig. 2 is a circuit diagram schematically illustrating the configuration of an apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Fig. 3 is a diagram schematically illustrating a diagnostic circuit that may be included in a diagnostic unit according to an embodiment of the present disclosure.
Fig. 4 is a diagram schematically showing the functional configuration of a control unit that controls the operation of a diagnostic unit according to an embodiment of the present disclosure.
Fig. 5 and 6 are diagrams for illustrating an operation of determining whether or not leakage occurs at a battery module, which is performed by the apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Fig. 7 is a diagram for illustrating an operation of determining whether a short circuit occurs at a positive electrode contactor performed by an apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Fig. 8 and 9 are diagrams schematically illustrating some circuits that may be formed by the apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Fig. 10 is a graph schematically illustrating a variation of a first diagnostic voltage according to time measured by the apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Fig. 11 is a diagram illustrating an operation of determining whether a short circuit occurs at a positive electrode contactor, which is performed by an apparatus for diagnosing a positive electrode contactor of a battery pack according to another embodiment of the present disclosure.
Fig. 12 is a graph schematically illustrating a variation of a first diagnostic voltage according to time measured by an apparatus for diagnosing a positive electrode contactor of a battery pack according to another embodiment of the present disclosure.
Fig. 13 to 15 are graphs schematically showing changes over time of the second diagnostic voltage and the third diagnostic voltage measured by the apparatus for diagnosing the positive electrode contactor of the battery pack according to another embodiment of the present disclosure.
Fig. 16 is a flowchart for illustrating a method for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms used in the specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to best explain the appropriately defined terms.
Accordingly, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of this disclosure, so it should be understood that other equivalents and modifications could be made thereto without departing from the scope of the invention.
Fig. 1 is a diagram schematically showing a functional configuration of a power system including an apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Referring to fig. 1, a
The
The
The
The
The
Fig. 2 is a circuit diagram schematically illustrating the configuration of an apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Referring to fig. 2, the
The
For example, as shown in fig. 2, a first insulation resistor Ra may be provided to be connected between the ground G and the positive electrode terminal of the
The electric energy stored in the battery assembly B may be supplied to a
The apparatus for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure may include a first
The first
Specifically, the first
For example, as shown in fig. 2, one end of the first protection resistor R11 may be connected to the first node N1, and one end of the first detection resistor R12 may be connected to the ground G. Also, the other end of the first protection resistor R11 and the other end of the first detection resistor R12 may be connected to one end and the other end of the first switch SW1, respectively. Even though fig. 2 depicts that the first switch SW1 is connected between the first protection resistor R11 and the first detection resistor R12, the connection of these components is not limited thereto.
Further, a first detection voltage V1 may be applied across the first detection resistor R12. At this time, the first measurement voltage may be calculated from the first detection voltage V1. For example, if the resistance of the first protection resistor R11 is 99 times the resistance of the first detection resistor R12, the first measurement voltage may be calculated as 100 times the first detection voltage V1.
The first switch SW1 may apply a first measurement voltage to the first voltage divider circuit. In particular, the first switch SW1 may apply the first measurement voltage to the first voltage dividing circuit in response to a control signal output from the
The second
Specifically, the second
For example, as shown in fig. 2, one end of the second protection resistor R21 may be connected to the second node N2, and one end of the second sensing resistor R22 may be connected to the ground G. Also, the other end of the second protection resistor R21 and the other end of the second detection resistor R22 may be connected to one end and the other end of the second switch SW2, respectively. Even though fig. 2 shows that the second switch SW2 is connected between the second protection resistor R21 and the second detection resistor R22, the present disclosure is not limited to the above connection order.
Further, a second detection voltage V2 may be applied across the second detection resistor R22. At this time, the second measurement voltage may be calculated from the second detection voltage V2. For example, if the resistance of the second protection resistor R21 is 99 times the resistance of the second detection resistor R22, the second measurement voltage may be calculated as 100 times the second detection voltage V2.
The second switch SW2 may apply a second measurement voltage to the second voltage divider circuit. In particular, the second switch SW2 may apply the second measurement voltage to the second voltage division circuit in response to a control signal output from the
Preferably, the ratio between the resistance of the first protection resistor R11 and the resistance of the first detection resistor R12 may be designed to be equal to the ratio between the resistance of the second protection resistor R21 and the resistance of the second detection resistor R22. For example, the resistance of the first protection resistor R11 and the resistance of the second protection resistor R21 may be equal to each other, and the resistance of the first detection resistor R12 and the resistance of the second detection resistor R22 may be equal to each other. At this time, in order to protect the first and second detection resistors R12 and R22 from a high voltage, the resistances of the first and second protection resistors R11 and R21 may be designed to be sufficiently greater than the resistances of the first and second detection resistors R12 and R22, respectively. For example, the resistance of the first protection resistor R11 may be 99 times the resistance of the first detection resistor R12.
The
In particular, the positive electrode protection capacitor C1 and the negative electrode protection capacitor C2 may be connected in series between a positive electrode terminal of the battery pack P and a negative electrode terminal of the battery pack P. In addition, one end of the positive electrode protection capacitor C1 and one end of the negative electrode protection capacitor C2 may be commonly connected to the ground G. At this time, the positive electrode protective capacitor C1 and the negative electrode protective capacitor C2 may be referred to as "Y-CAP".
The
The
The
The
Fig. 3 is a diagram schematically illustrating a diagnostic circuit that may be included in a diagnostic unit according to an embodiment of the present disclosure.
Referring to fig. 3, a
The first
Specifically, the first
For example, as shown in fig. 3, one end of the third protection resistor R31 may be connected to the third node N3, and one end of the third detection resistor R32 may be connected to the second node N2. In addition, the other end of the third protection resistor R31 and the other end of the third detection resistor R32 may be connected to one end and the other end of the third switch SW3, respectively. Even though fig. 3 depicts that the third switch SW3 is connected between the third protection resistor R31 and the third detection resistor R32, the present disclosure is not limited to this connection order.
Further, a third detection voltage V3 may be applied across the third detection resistor R32. At this time, the first diagnostic voltage may be calculated from the third detection voltage V3. For example, if the resistance of the third protection resistor R31 is 99 times the resistance of the third detection resistor R32, the first diagnostic voltage may be calculated as 100 times the third detection voltage V3.
Third switch SW3 may apply the first diagnostic voltage to the third voltage divider circuit. In particular, the third switch SW3 may apply the first diagnostic voltage to the third voltage division circuit in response to a control signal output from the
The second
Specifically, the second
For example, as shown in fig. 3, one end of the fourth protection resistor R41 may be connected to the third node N3, and one end of the fourth detection resistor R42 may be connected to the ground G. Also, the other end of the fourth protection resistor R41 and the other end of the fourth detection resistor R42 may be connected to one end and the other end of the fourth switch SW4, respectively. Even though fig. 3 depicts that the fourth switch SW4 is connected between the fourth protection resistor R41 and the fourth detection resistor R42, the present disclosure is not limited to this connection order.
In addition, a fourth detection voltage V4 may be applied across the fourth detection resistor R42. At this time, the second diagnostic voltage may be calculated from the fourth detection voltage V4. For example, if the resistance of the fourth protection resistor R41 is 99 times the resistance of the fourth detection resistor R42, the second diagnostic voltage may be calculated as 100 times the fourth detection voltage V4.
The fourth switch SW4 may apply the second diagnostic voltage to the fourth voltage divider circuit. In particular, the fourth switch SW4 may apply the second diagnostic voltage to the fourth voltage dividing circuit in response to a control signal output from the
The third
Specifically, the third
For example, as shown in fig. 3, one end of the fifth protection resistor R51 may be connected to the fourth node N4, and one end of the fifth sensing resistor R52 may be connected to the ground G. In addition, the other end of the fifth protection resistor R51 and the other end of the fifth detection resistor R52 may be connected to one end and the other end of the fifth switch SW5, respectively. Even though fig. 3 shows that the fifth switch SW5 is connected between the fifth protection resistor R51 and the fifth detection resistor R52, the present disclosure is not limited to this connection order.
Further, a fifth detection voltage V5 may be applied across the fifth detection resistor R52. At this time, the third diagnostic voltage may be calculated from the fifth detection voltage V5. For example, if the resistance of the fifth protection resistor R51 is 99 times the resistance of the fifth detection resistor R52, the third diagnostic voltage may be calculated as 100 times the fifth detection voltage V5.
The fifth switch SW5 may apply the third diagnostic voltage to the fifth voltage divider circuit. In particular, the fifth switch SW5 may apply the third diagnostic voltage to the fifth voltage division circuit in response to the control signal output from the
Preferably, the
The battery pack
Specifically, the battery pack
For example, as shown in fig. 3, one end of a sixth protection resistor R61 may be connected to the first node N1, and one end of a sixth detection resistor R62 may be coupled to the second node N2. Also, the other end of the sixth protection resistor R61 and the other end of the sixth detection resistor R62 may be connected to one end and the other end of the sixth switch SW6, respectively. Even though fig. 3 shows that the sixth switch SW6 is connected between the sixth protection resistor R61 and the sixth detection resistor R62, the present disclosure is not limited to this connection order.
Further, a sixth detection voltage V6 may be applied across the sixth detection resistor R62. At this time, the both-end voltage of the
The sixth switch SW6 may apply the both-end voltage of the
Preferably, the ratio between the resistance of the third protection resistor R31 and the resistance of the third detection resistor R32 may be designed to be the same as the ratio between the resistance of the fourth protection resistor R41 and the resistance of the fourth detection resistor R42, the ratio between the resistance of the fifth protection resistor R51 and the resistance of the fifth detection resistor R52, and the ratio between the resistance of the sixth protection resistor R61 and the resistance of the sixth detection resistor R62. At this time, in order to protect the third, fourth, fifth, and sixth sense resistors R32, R42, R52, and R62 from high voltage, the resistances of the third, fourth, fifth, and sixth sense resistors R31, R41, R51, and R61 may be designed to be sufficiently greater than the resistances of the third, fourth, fifth, and sixth sense resistors R32, R42, R52, and R62, respectively. For example, the resistances of the third, fourth, fifth, and sixth protection resistors R31, R41, R51, and R61 may be 99 times the resistances of the third, fourth, fifth, and sixth detection resistors R32, R42, R52, and R62, respectively.
The
With this configuration, the apparatus for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure may simultaneously determine whether the
Fig. 4 is a diagram schematically showing the functional configuration of a control unit that controls the operation of a diagnostic unit according to an embodiment of the present disclosure.
Referring to fig. 4, the
The microprocessor 271 may manage the overall operation of the
Preferably, the microprocessor 271 may have at least one memory. That is, the microprocessor 271 may include at least one memory. Programs and data associated with various operations performed by the device for diagnosing the positive electrode contactor PC of the battery pack P may be prestored in the memory. For example, the resistances of the resistors respectively included in the first
The multiplexer 272 may include a plurality of voltage input ports In1 through In6, a selection input port IS, and an output port OUT. The plurality of voltage input ports In1 to In6 may be configured to receive a plurality of sensing voltages V1 to V6, respectively. For example, as shown In fig. 4, a plurality of detection voltages V1 to V6 generated by the first
The selection input port IS may be configured to receive a selection command signal S that allows selection of any one of a plurality of detection voltages V1 through V6. For example, as shown in fig. 4, a selection command signal S output from the microprocessor 271 may be input to the selection input port IS.
The output port OUT may be configured to output a detection voltage selected from a plurality of detection voltages V1 to V6. For example, as shown In fig. 4, the multiplexer 272 may select any one of a plurality of voltage input ports In1 to In6 based on a selection command signal S input to the selection input port IS and output the selected voltage input port to the output port OUT. At this time, the output port OUT may output one of a plurality of detection voltages V1 to V6.
The ADC273 may be configured to convert the analog signal a supplied from the multiplexer 272 into a digital signal D and then transmit the digital signal D to the microprocessor 271. The analog signal a may be any one of a plurality of detection voltages V1 to V6. At this time, the microprocessor 271 may determine a plurality of detection voltages V1 to V6 based on the digital signal D received from the ADC 273. Also, the microprocessor 271 may measure the first measured voltage, the second measured voltage, the first diagnostic voltage, the second diagnostic voltage, the third diagnostic voltage, and the both-end voltage of the battery module based on the plurality of detected voltages V1 to V6.
For example, if the third voltage input port In3 is selected by the selection command signal S among the plurality of voltage input ports In1 to In6, the multiplexer 272 may connect the third voltage input port In3 and the output port OUT. Subsequently, the ADC273 may convert the analog signal a of the third detection voltage V3 transmitted from the multiplexer 272 into the digital signal D of the third detection voltage V3 and transmit the digital signal D of the third detection voltage V3 to the microprocessor 271. Subsequently, the microprocessor 271 may determine a first diagnostic voltage based on the digital signal D sent from the ADC 273.
The microprocessor 271 may determine whether the
For example, the first and second alarm signals W1 and W2 output from the microprocessor 271 may be converted into a user-recognizable form by an information guide device (not shown) provided at the
Fig. 5 and 6 are diagrams for illustrating an operation of determining whether or not electrical leakage occurs at a battery module, which is performed by an apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Referring to fig. 2 and 5, the control unit 270 may control the first switch SW1 to be in a closed state and the second switch SW2 to be in an open state to form a
The control unit 270 may measure the first measurement voltage. In particular, the control unit 270 may measure the first measurement voltage based on the first detection voltage V1 provided from the first
The control unit 270 may determine whether the
Referring to fig. 2 and 6, the control unit 270 may control the second switch SW2 to be in a closed state and the first switch SW1 to be in an open state to form a
The control unit 270 may measure the second measurement voltage. In particular, the control unit 270 may measure the second measurement voltage based on the second detection voltage V2 supplied from the second
The control unit 270 may determine whether the
Fig. 7 is a diagram for illustrating an operation of determining whether a short circuit occurs at a positive electrode contactor performed by an apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure. For convenience of explanation, the first and second insulation resistors Ra and Rb are not shown in fig. 7, and fig. 7 shows a circuit in a normal state in which the positive electrode contactor PC is not short-circuited.
The circuit shown in fig. 7 is a third circuit CC3 formed in the
The
The
In addition, the
In addition, the
Preferably, the
More preferably, the
Fig. 8 and 9 are diagrams schematically illustrating some circuits that may be formed by the apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure. For convenience of explanation, the first insulation resistor Ra, the second insulation resistor Rb, the battery pack
The circuits shown in fig. 8 and 9 are closed circuits that may be formed in the third circuit CC3 of fig. 7 during the first and second switching cycles. That is, the circuit shown in fig. 8 is a fourth circuit CC4 that may be formed in the third circuit CC3 during the first switching cycle, and the circuit shown in fig. 9 is a fifth circuit CC5 that may be formed in the third circuit CC3 during the second switching cycle.
First, referring to fig. 7 and 8, the
Referring to fig. 7 and 9, the
The
For example, as shown in fig. 2 and 7, the
Subsequently, the
The
For example, as shown in fig. 8, if the fourth circuit CC4 is formed, the first assembly current I1 flows from the positive electrode terminal of the battery assembly B to the negative electrode terminal of the battery assembly B through the battery assembly voltage VB. At this time, since the positive electrode protection capacitor C1 is in a charged state as described above, the voltage applied to the positive electrode protection capacitor C1 may be equal to the voltage value of the battery assembly B. Subsequently, the positive electrode protection capacitor C1 is gradually discharged. Specifically, by outputting the charging power in the direction in which the first current I1 flows, the positive electrode protection capacitor C1 is gradually discharged.
For example, as shown in fig. 9, if the fifth circuit CC5 is formed, a reverse voltage is applied to the positive electrode protection capacitor C1 when the second current I2 flows in the opposite direction to the first current I1. That is, the third detection voltage V3 detected by the
Fig. 10 is a graph schematically illustrating a variation of a first diagnostic voltage according to time measured by the apparatus for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure.
Fig. 10 is a graph showing a change in the first diagnostic voltage according to time in a normal state in which a short circuit caused by a fault does not occur at the positive electrode contactor PC and the negative electrode contactor NC. Here, in the region before T0 and after T2, both the positive electrode contactor PC and the negative electrode contactor NC are turned on, and in the region from T0 to T2, both the positive electrode contactor PC and the negative electrode contactor NC are turned off.
Referring to fig. 7 together, in the region before T0 and after T2, the positive electrode contactor PC is turned on so that the terminal voltage of the battery assembly B is applied between the third node N3 and the second node N2, and thus the first diagnostic voltage may be maintained at a constant positive value. For example, the first diagnostic voltage may be equal to the battery pack voltage VB.
During a first switching cycle corresponding to a region from T0 to T1 in which the fourth circuit CC4 of fig. 8 is formed, the
During a second switching cycle corresponding to a region from T1 to T2 in which the fifth circuit CC5 of fig. 9 is formed, the
The
Fig. 11 is a diagram illustrating an operation of determining whether a short circuit occurs at a positive electrode contactor, which is performed by an apparatus for diagnosing a positive electrode contactor of a battery pack according to another embodiment of the present disclosure. Here, features different from the previous embodiment will be mainly described, and the same or similar features as the previous embodiment will not be described in detail. Fig. 11 is a circuit diagram showing the positive electrode contactor PC in a short-circuited state.
The circuit shown in fig. 11 is a sixth circuit CC6 formed in the
If the positive electrode contactor PC is short-circuited due to a fault, the positive electrode contactor PC is short-circuited to maintain the on state even if the
Fig. 12 is a graph schematically illustrating a variation of a first diagnostic voltage according to time measured by an apparatus for diagnosing a positive electrode contactor of a battery pack according to another embodiment of the present disclosure. Here, features different from the previous embodiment will be mainly described, and the same or similar features as the previous embodiment will not be described in detail.
The graph shown in fig. 12 shows the change in the first diagnostic voltage according to time when the positive electrode contactor PC is short-circuited due to a fault. Here, in the regions before T0 and after T2, both the positive electrode contactor PC and the negative electrode contactor NC are turned on, and in the region from T0 to T2, the positive electrode contactor PC is short-circuited.
The
Referring to fig. 11 together, if the positive electrode contactor PC is short-circuited, the positive electrode terminal of the battery assembly B may be connected to the third node N3 through the positive electrode contactor PC, and the negative electrode terminal of the battery assembly B may be connected to the second node N2, thereby applying the battery assembly voltage VB to the first
With this configuration, the apparatus for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure can determine whether the positive electrode contactor PC is short-circuited through the measurement mode of the first diagnostic voltage. Therefore, it can be simply determined whether the positive electrode contactor PC is short-circuited.
Fig. 13 to 15 are graphs schematically showing changes over time of second and third diagnostic voltages measured by an apparatus for diagnosing a positive electrode contactor of a battery pack according to another embodiment of the present disclosure, and in the graphs shown in fig. 13 to 15, ① denotes a first switching cycle and ② denotes a second switching cycle.
First, the graph of fig. 13 shows the changes of the second diagnostic voltage and the third diagnostic voltage according to time when the positive electrode contactor PC is short-circuited due to a fault. Here, the regions from T0 to T1 and from T2 to T3 are the first switching cycles, and the regions from T1 to T2 and from T3 to T4 are the second switching cycles. Also, in the region from T0 to T4, the positive electrode contactor PC is in a short-circuited state.
The
The
For example, as shown in the graph of fig. 13, if the third mode has a value of 0 or more and also has a constant upper limit of 0 or more and a constant lower limit of 0 or more while the third diagnostic voltage is gradually increased such that the difference in voltage value between the third mode and the fourth mode is gradually decreased, the
For example, if the third and fourth patterns recorded during the repeated first and second switching cycles have the form as shown in fig. 13, the
Here, referring to fig. 14 and 15, the graph of fig. 14 shows the third and fourth modes when both the positive electrode contactor PC and the negative electrode contactor NC are in the normal state. In addition, the graph of fig. 15 shows the third and fourth modes when both the positive electrode contactor PC and the negative electrode contactor NC are in a failure state due to a short circuit.
As shown in the graph of fig. 14, if both the positive electrode contactor PC and the negative electrode contactor NC are in the normal state, the second diagnostic voltage does not have a value above 0 but gradually decreases to have an upper limit VH below 0 and a lower limit VL below 0. In addition, the third diagnostic voltage does not show a gradual increase.
As shown in the graph of fig. 15, if both the positive electrode contactor PC and the negative electrode contactor NC are in a failure state due to a short circuit, the third diagnostic voltage does not show a gradual increase, and the difference between the voltage value of the second diagnostic voltage and the voltage value of the third diagnostic voltage does not gradually decrease.
With this configuration, the apparatus for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure can determine whether only the positive electrode contactor PC is short-circuited. Specifically, by comparing the form shown in the graphs of fig. 14 and 15 and the form shown in the graph of fig. 13, it is possible to determine whether only the positive electrode contactor PC is short-circuited in a manner different from the case where both the positive electrode contactor PC and the negative electrode contactor NC are short-circuited.
The device for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure may be provided in the battery pack P itself. That is, the battery pack P according to the present disclosure may include the above-described means for diagnosing the positive electrode contactor of the battery pack P of the present disclosure. Here, the battery pack P may include at least one secondary battery, a device for diagnosing a positive electrode contactor of the battery pack P, electrical components (BMS, relay, fuse, etc.), a case, and the like. In this configuration, at least some components of the apparatus for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure may be implemented by supplementing or adding functions of components included in the conventional battery pack P. For example, the
Fig. 16 is a flowchart for illustrating a method for diagnosing a positive electrode contactor of a battery pack according to an embodiment of the present disclosure. In fig. 16, the main body of each step may be each component of the apparatus for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure as described above.
As shown in fig. 16, the method for diagnosing the positive electrode contactor of the battery pack P according to the present disclosure includes an insulation resistance measuring step (S100), a diagnostic voltage measuring step (S110), and a short circuit diagnostic step (S120).
First, in the insulation resistance measuring step S100, a first measurement voltage applied between the ground G and the first node N1 may be measured, a positive electrode terminal of the
In the diagnostic voltage measuring step S110, a first diagnostic voltage applied between the second node N2 and a third node N3 located between the other end of the positive electrode contactor PC and the positive electrode terminal of the battery pack P, a second diagnostic voltage applied to the positive electrode protection capacitor C1 located between the positive electrode terminal of the battery pack P and the ground G, and a third diagnostic voltage applied to the negative electrode protection capacitor C2 located between the negative electrode terminal of the battery pack P and the ground G may be measured.
In the short diagnosis step S120, whether the battery module is electrically leaked may be diagnosed by using the first and second measured voltages, and whether the positive electrode contactor PC is short-circuited may be diagnosed by using at least one of the first, second, and third diagnosis voltages.
Further, in the short diagnosis step S120, the first, second and third diagnosis voltages may be measured during the first and second switching cycles.
Further, in the short diagnosis step S120, if the first diagnosis voltage has a positive value and the absolute value of the first diagnosis voltage gradually decreases during the first switching cycle, and if the first diagnosis voltage has a negative value and the absolute value of the first diagnosis voltage gradually decreases during the second switching cycle, it may be determined that the positive electrode contactor PC is in a normal state without short.
Further, in the short diagnosis step S120, if the first diagnosis voltage has a positive value and remains constant during the first switching cycle and the second switching cycle, it may be determined that the positive electrode contactor PC is in a failure state due to a short circuit.
Further, in the short diagnosis step S120, if the second diagnosis voltage has a value of 0 or more and the difference between the voltage value of the second diagnosis voltage and the voltage value of the third diagnosis voltage gradually decreases during the first switching cycle and the second switching cycle, it may be determined that the positive electrode contactor PC is in a failure state due to a short circuit.
The present disclosure has been described in detail. It should be understood, however, that the detailed description and the specific examples, while indicating preferred embodiments of the disclosure, are given by way of illustration only, since various changes and modifications within the scope of the disclosure will become apparent to those skilled in the art from this detailed description.
Meanwhile, in this specification, the terms "unit" and "portion", such as "measurement unit", "diagnosis unit", and "control unit", are used. However, it will be apparent to those skilled in the art that these terms represent only logical configuration elements, and are not intended to represent components that are or must be physically separated.