KR20220120372A - Battery management apparatus and method of the same - Google Patents

Abstract

According to one embodiment disclosed in the document, a battery management method may include: a measurement unit measuring a voltage of at least one battery cell inside a battery pack, a temperature of a battery module inside the battery pack, insulation resistance of the battery pack, and a voltage of the battery pack; and a diagnosis unit diagnosing a state of the battery pack based on the voltage of the at least one battery cell, the temperature of the battery module, the insulation resistance of the battery pack, and the voltage of the battery pack.

Description

BATTERY MANAGEMENT APPARATUS AND METHOD OF THE SAME

Embodiments disclosed in this document relate to a battery management apparatus and an operating method thereof.

Recently, research and development on secondary batteries has been actively carried out. Here, the secondary battery is a battery capable of charging and discharging, and includes all of a conventional Ni/Cd battery, a Ni/MH battery, and a recent lithium ion battery. Among secondary batteries, lithium ion batteries have an advantage in that their energy density is much higher than that of conventional Ni/Cd batteries and Ni/MH batteries. In addition, lithium ion batteries can be manufactured in a small size and light weight, so they are used as power sources for mobile devices. Recently, the range of use has been expanded as a power source for electric vehicles, drawing attention as a next-generation energy storage medium.

On the other hand, in the case of a lithium-ion battery, when an internal ignition occurs, the voltage of the battery cell is rapidly lowered due to a short circuit of the battery cell, and the temperature of the battery rises significantly. have. Since such a fire not only seriously affects the performance of the battery, but also threatens the safety of the user, a technology capable of detecting the ignition inside the battery is required.

SUMMARY An object of the embodiments disclosed in this document is to provide a battery management apparatus for accurate diagnosis of internal ignition of a battery pack and an operating method thereof.

Technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

The battery management apparatus according to an embodiment disclosed in this document measures the voltage of at least one battery cell inside the battery pack, the temperature of the battery module inside the battery pack, the insulation resistance of the battery pack, and the voltage of the battery pack and a diagnostic unit configured to diagnose the state of the battery pack based on a voltage of the at least one battery cell, a temperature of the battery module, an insulation resistance of the battery pack, and a voltage of the battery pack.

In an embodiment, the diagnosis unit generates a first result value based on whether a rate of decrease of the voltage of the at least one battery cell is equal to or greater than a specific value and whether a rate of change of the temperature of the battery module satisfies a predetermined condition . In addition, a second result value is generated based on whether the insulation resistance of the battery pack is equal to or less than a threshold resistance value and whether the voltage reduction of the battery pack is equal to or greater than a threshold voltage value. The state of the battery pack may be diagnosed based on the first result value and the second result value.

In an embodiment, the diagnosis unit increases the first result value when the rate of decrease of the voltage of the at least one battery cell is equal to or greater than the specific value or when the rate of change of the temperature of the battery module satisfies the predetermined condition . When the first result value is equal to or greater than the first reference value, it may be determined whether the insulation resistance of the battery pack is equal to or less than the threshold resistance value and whether the voltage reduction of the battery pack is equal to or greater than the threshold voltage value.

In an embodiment, when the first result value is equal to or greater than the first reference value, when the insulation resistance of the battery pack is equal to or less than the threshold resistance value, or when the voltage reduction of the battery pack is equal to or greater than the threshold voltage value, the Increase the second result. When the second result value is equal to or greater than the second reference value, it may be diagnosed that internal ignition of the battery pack has occurred.

In an embodiment, the diagnosis unit increases the third result value when the second reference value is greater than or equal to the second reference value. When the third result value is equal to or greater than the third reference value, it may be diagnosed that the internal ignition has occurred. This is this embodiment.

In this embodiment, when the first result value is less than the first reference value, the diagnosis unit may decrease the third result value.

In one embodiment, the specific value is 25%, and the predetermined condition may be that the rate of change of the temperature of the battery module is greater than 1°C/sec for 3 seconds.

The operating method of the battery management apparatus according to an embodiment disclosed in this document includes a voltage of at least one battery cell inside a battery pack, a temperature of a battery module inside the battery pack, an insulation resistance of the battery pack, and a temperature of the battery pack. It may include measuring a voltage, and diagnosing the state of the battery pack based on the voltage of the at least one battery cell, the temperature of the battery module, the insulation resistance of the battery pack, and the voltage of the battery pack. have.

In an embodiment, the diagnosing the state of the battery pack may include determining whether a rate of decrease in voltage of the at least one battery cell is equal to or greater than a specific value and whether a rate of change in temperature of the battery module satisfies a predetermined condition and a second determination step of determining whether the insulation resistance of the battery pack is equal to or less than a threshold resistance value and whether the voltage decrease of the battery pack is equal to or greater than a threshold voltage value.

In an embodiment, the first determining step includes determining the first result value when the rate of decrease of the voltage of the at least one battery cell is equal to or greater than the specific value or when the rate of change of the temperature of the battery module satisfies the predetermined condition. It may include calculating a first result value to increase, and determining whether the first result value is equal to or greater than a first reference value.

In an embodiment, in the second determining step, when it is determined in the first determining step that the first result value is greater than or equal to the first reference value, the insulation resistance of the battery pack is less than or equal to the threshold resistance value, or the battery pack The method may include calculating a second result value of increasing a second result value when the voltage decrease of is equal to or greater than the threshold voltage value, and determining whether the second result value is equal to or greater than a second reference value.

In an embodiment, the diagnosing the state of the battery pack may include diagnosing that the internal fire of the battery pack has occurred when it is determined in the second determining step that the second result value is equal to or greater than the second reference value.

In an embodiment, the diagnosing the state of the battery pack may include increasing a third result value when it is determined in the second determining step that the second result value is greater than or equal to the second reference value, and the third result value is and a final determination step of determining whether or not the third reference value is greater than or equal to the third reference value.

In an embodiment, the diagnosing the state of the battery pack may decrease the third result value when the first result value of the first determination step is less than the first reference value.

A battery management apparatus and an operating method thereof according to an embodiment disclosed in this document may measure a plurality of physical quantities of a battery pack and accurately diagnose whether the battery pack is internally ignited based on the measurement.

1 is a view showing a battery pack according to an embodiment disclosed in this document.
2 is a block diagram illustrating a battery management apparatus according to an exemplary embodiment disclosed in this document.
3 is a flowchart illustrating a method of operating a battery management apparatus according to an exemplary embodiment disclosed in this document.
4 and 5 are flowcharts for explaining the step of diagnosing the state of the battery pack in the operating method of the battery management apparatus according to an embodiment disclosed in this document.
6 is a flowchart for describing in detail a method of operating a battery management apparatus according to an exemplary embodiment disclosed in this document.
7 is a flowchart illustrating a step of calculating a first result value in a method of operating a battery management apparatus according to an exemplary embodiment disclosed in this document.
8 is a flowchart illustrating a second result value calculation step in a method of operating a battery management apparatus according to an exemplary embodiment disclosed in this document.

Hereinafter, embodiments disclosed in this document will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiments disclosed in this document, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment disclosed in this document, the detailed description thereof will be omitted.

In describing the components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments disclosed in this document belong. . Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

1 is a view showing a battery pack according to an embodiment disclosed in this document.

Referring to FIG. 1 , a battery pack 100 according to an embodiment disclosed in this document may include a battery module 110 , a battery management device 120 , and a relay 130 .

The battery module 110 may include a plurality of battery cells 111 , 112 , 113 , and 114 . In FIG. 1 , the plurality of battery cells is illustrated as four, but the present invention is not limited thereto, and the battery module 110 may include n (n is a natural number greater than or equal to 2) battery cells. The battery module 110 may supply power to a target device (not shown). To this end, the battery module 110 may be electrically connected to the target device. Here, the target device may include an electrical, electronic, or mechanical device that operates by receiving power from the battery pack 100 including a plurality of battery cells 111 , 112 , 113 , and 114 , for example. , the target device may be an electric vehicle (EV), but is not limited thereto.

The plurality of battery cells 111 , 112 , 113 , and 114 are a lithium ion (Li-ion) battery, a lithium ion polymer (Li-ion polymer) battery, a nickel cadmium (Ni-Cd) battery, and a nickel hydrogen (Ni-MH) battery. It may be a battery, and the like, but is not limited thereto. Meanwhile, although one battery module 110 is illustrated in FIG. 1 , a plurality of battery modules 110 may be configured according to an embodiment.

The battery management device 120 may manage and/or control the state and/or operation of the battery module 110 . For example, the battery management apparatus 120 may manage and/or control the states and/or operations of the plurality of battery cells 111 , 112 , 113 , and 114 included in the battery module 110 . The battery management device 120 may manage charging and/or discharging of the battery module 110 .

In addition, the battery management device 120 includes the voltage, current, Temperature, insulation resistance, etc. can be monitored. In addition, for monitoring by the battery management device 120 , a sensor or various measurement modules not shown may be additionally installed in the battery module 110 , a charging/discharging path, or an arbitrary location such as the battery module 110 . The battery management device 120 determines a parameter indicating the state of the battery module 110, for example, SOC (State of Charge) or SOH (State of Health), etc. based on the monitored measured values such as voltage, current, and temperature. can be calculated.

The battery management device 120 may control the operation of the relay 130 . For example, the battery management device 120 may short-circuit the relay 130 to supply power to the target device. Also, the battery management device 120 may short-circuit the relay 130 when the charging device is connected to the battery pack 100 .

The battery management apparatus 120 may diagnose the state of the battery pack 100 based on the monitored measured values such as voltage, current, and temperature. For example, the battery management device 120 may determine a voltage reduction rate of each of the battery cells 111 , 112 , 113 , and 114 , a temperature change rate of the battery module 110 , an insulation resistance of the battery pack 100 , and a battery pack. The state of the battery pack 100 may be diagnosed based on the voltage decrease of ( 100 ).

The battery management device 120 may provide a result of diagnosing the state of the battery pack 100 to the user. Accordingly, the user can check the state of the battery pack 100 and take an appropriate response. For example, the battery management device 120 may diagnose the fire inside the battery pack 100 , and the user can prevent an accident through appropriate measures such as terminating the use of the battery or replacing the battery pack 100 . can

Hereinafter, a detailed operation of the battery management apparatus 120 will be described with reference to FIG. 2 .

2 is a block diagram illustrating a battery management apparatus according to an exemplary embodiment disclosed in this document.

Referring to FIG. 2 , the battery management apparatus 120 according to an embodiment disclosed in this document may include a measurement unit 121 and a diagnosis unit 122 .

The measurement unit 121 may measure at least one physical quantity related to the battery pack 100 , the battery module 110 , and each battery cell 111 , 112 , 113 , and 114 included in the battery module 110 . have. For example, the physical quantity may include voltage, temperature, insulation resistance, and the like.

for example. The measuring unit 121 measures the voltage of the at least one battery cell 111 , 112 , 113 , and 114 , the temperature of the battery module 110 , the insulation resistance of the battery pack 100 , and the voltage of the battery pack 100 . can However, the physical quantity measured by the measurement unit 121 is not limited thereto, and various physical quantities may be further measured.

The diagnosis unit 122 may diagnose the state of the battery pack 100 based on the physical quantities measured by the measurement unit 121 . For example, the diagnostic unit 122 may include a voltage of at least one battery cell 111 , 112 , 113 , and 114 , a temperature of the battery module 110 , an insulation resistance of the battery pack 100 , and a temperature of the battery pack 100 . The state of the battery pack 100 may be diagnosed based on the voltage.

Specifically, the diagnosis unit 122 may calculate a voltage reduction rate of at least one of the battery cells 111 , 112 , 113 , and 114 , and determine whether the calculated voltage reduction rate is greater than or equal to a specific value. Also, the diagnosis unit 122 may check whether the rate of change of the temperature of the battery module 110 satisfies a predetermined condition. For example, the specific value may be 25%, and a predetermined condition may be set such that the rate of change of the temperature of the battery module exceeds 1° C./sec for 3 seconds. However, this is only an example and is not limited to the set value. The diagnosis unit 122 may generate a first result value based on the confirmation result.

That is, the diagnostic unit 122 generates an internal short circuit in the battery cells 111 , 112 , 113 , and 114 when ignition occurs inside the battery pack 100 , so that the voltage of the battery cells 111 , 112 , 113 , 114 increases. Since it may be rapidly decreased, a decrease rate of the voltage of the at least one battery cell 111 , 112 , 113 , and 114 may be confirmed.

In addition, since the diagnosis unit 122 causes an internal short circuit of the battery cells 111 , 112 , 113 , and 114 when ignition occurs inside the battery pack 100 , so that the temperature can continuously and rapidly increase, the battery module 110 . You can check the rate of change of temperature.

The diagnosis unit 122 may determine whether the insulation resistance of the battery pack 100 is equal to or less than a threshold resistance value. Also, the diagnosis unit 122 may determine whether the voltage decrease of the battery pack 100 is equal to or greater than a threshold voltage value. The diagnosis unit 122 may generate a second result value based on the confirmation result.

That is, when ignition occurs inside the battery pack 100 , the diagnosis unit 122 causes an internal short circuit of at least one battery cell 111 , 112 , 113 , and 114 to lower the insulation resistance of the battery pack 100 . Therefore, it is possible to check the insulation resistance of the battery pack 100 .

In addition, the diagnostic unit 122 is configured to perform an internal short circuit of at least one of the battery cells 111 , 112 , 113 , and 114 when an ignition occurs inside the battery pack 100 , so that the voltage of the corresponding cell rapidly decreases, Since the voltage of the battery pack 100 may also decrease, a decrease in the voltage of the battery pack 100 may be confirmed.

The diagnosis unit 122 may diagnose the state of the battery pack 100 based on the generated first and second result values.

The diagnosis unit 122 may calculate a decrease rate of the voltage of the at least one battery cell 111 , 112 , 113 , and 114 , and increase the first result value when the calculated voltage decrease rate is greater than or equal to a specific value. Also, when the rate of change of the temperature of the battery module 110 satisfies a predetermined condition, the diagnosis unit 122 may increase the first result value.

The diagnosis unit 122 determines whether the insulation resistance of the battery pack 100 is less than or equal to a threshold resistance value or a decrease in voltage of the battery pack 100 is equal to or greater than a threshold voltage value when the first result value is equal to or greater than a preset first reference value can do.

The diagnosis unit 122 may increase the second result value when the insulation resistance of the battery pack 100 is equal to or less than the threshold resistance value. Also, the diagnosis unit 122 may increase the second result value when the voltage decrease of the battery pack 100 is equal to or greater than the threshold voltage value.

When the second result value is equal to or greater than a preset second reference value, the diagnosis unit 122 may diagnose that ignition has occurred inside the battery pack 100 .

Also, the diagnosis unit 122 may generate a third result value based on the second result value and diagnose the state of the battery pack 100 based on the third result value. For example, when the second result value is equal to or greater than a preset second reference value, the diagnosis unit 122 may increase the third result value. The diagnosis unit 122 may diagnose that ignition has occurred inside the battery pack 100 when the third result value is equal to or greater than the third reference value.

That is, the diagnosis unit 122 may compare the second result value with the second reference value and diagnose that the internal ignition of the battery pack 100 has occurred based on the comparison, but may result in a one-time measurement error or a temporary battery pack 100 . ), since internal fire can be incorrectly diagnosed based on the abnormality of ), a third result value can be introduced for more accurate diagnosis.

Meanwhile, when the first result value is less than a preset first reference value, the diagnosis unit 122 may decrease the third result value. In this case, if the third result value is the initial set value, the third result value may not be decreased.

As described above, the diagnosis unit 122 may determine the voltage of at least one battery cell 111 , 112 , 113 , and 114 , the temperature of the battery module 110 , the insulation resistance of the battery pack 100 , and the battery pack 100 . Whether internal ignition of the battery pack 100 has occurred may be diagnosed based on the state of the battery pack 100 based on the voltage of . Accordingly, an accurate diagnosis may be possible.

Meanwhile, according to an embodiment, the battery management apparatus 120 may repeatedly perform the above-described operations for a predetermined period of time. For example, the first result value and the second result value may be initialized when an operation is repeatedly performed. However, since the third result value is an accumulated value, it may not be initialized.

3 is a flowchart illustrating a method of operating a battery management apparatus according to an exemplary embodiment disclosed in this document.

Referring to FIG. 3 , a method of operating a battery management apparatus according to an embodiment disclosed in this document includes measuring a voltage of a battery pack, an insulation resistance of a battery pack, a temperature of a battery module, and a voltage of at least one battery cell. It may include a step (S100) and a step (S200) of diagnosing the state of the battery pack.

In step S100 , the measuring unit 121 measures the voltage of the at least one battery cell 111 , 112 , 113 , 114 , the temperature of the battery module 110 , the insulation resistance of the battery pack 100 , and the battery pack 100 . voltage can be measured.

Hereinafter, the step of diagnosing the state of the battery pack ( S200 ) will be described in detail with reference to FIGS. 4 and 5 .

4 and 5 are diagrams specifically illustrating the step of diagnosing the state of the battery pack ( S200 ) in the method of operating the battery management apparatus according to an exemplary embodiment disclosed in this document. For example, the case of FIG. 4 may be divided into the first embodiment, and the case of FIG. 5 may be divided into the second embodiment.

First, referring to FIG. 4 , the step ( S200 ) of diagnosing the state of the battery pack according to an embodiment disclosed in this document includes a first determination step ( S210 ), a second determination step ( S220 ), and an internal ignition occurrence diagnosis (S230) may be included.

In the first determination step S210 , the diagnosis unit 122 determines the first result value when the rate of decrease of the voltage of the at least one battery cell 111 , 112 , 113 , and 114 measured by the measurement unit 121 is equal to or greater than a specific value. can increase In the first determination step S120 , the diagnosis unit 122 may increase the first result value when the rate of change of the temperature of the battery module 110 measured by the measurement unit 121 satisfies a predetermined condition. In the first determination step (S210), the diagnosis unit 122 may determine whether the first result value is equal to or greater than a preset first reference value, and if it is determined that the first result value is equal to or greater than the first predetermined reference value, a second determination step ( S220) may be performed.

In the second determination step S220 , the diagnosis unit 122 may increase the second result value when the insulation resistance of the battery pack 100 measured by the measurement unit 121 is equal to or less than the threshold resistance value. In the second determination step S220 , the diagnosis unit 122 may increase the second result value when the decrease in the voltage of the battery pack 100 measured by the measurement unit 121 is equal to or greater than the threshold voltage value. The diagnosis unit 122 may determine whether the second result value is equal to or greater than a preset second reference value.

In the internal ignition occurrence diagnosis (S230), the diagnosis unit 122 diagnoses that the internal ignition has occurred in the battery pack 100 when the second result value is determined to be greater than or equal to the preset second reference value in the second judgment step (S220). can do.

In the step (S200) of diagnosing the state of the battery pack, the diagnosis unit 122 may not be limited by the order in performing the first determination step (S210) and the second determination step (S220). For example, in the step (S200) of diagnosing the state of the battery pack, the diagnosis unit 122 performs the second determination step (S220) simultaneously with the first determination step (S210) or rather than the first determination step (S210). You can do it first.

Referring to FIG. 5 , the step (S200) of diagnosing the state of the battery pack of the operating method of the battery management apparatus according to an embodiment disclosed in this document includes a first determination step (S310), a second determination step (S320), and a final determination step (S330), and as a result, it is possible to diagnose (S340) that ignition has occurred inside the battery pack.

The first determination step S310 may be substantially the same as the first determination step S210 illustrated in FIG. 4 . Also, the second determination step S320 may be substantially the same as the second determination step S220 illustrated in FIG. 4 .

In the final determination step S330 , the diagnosis unit 122 may increase the third result value when it is determined that the second result value is greater than or equal to the preset second reference value in the second determination step S320 . In the final determination step S330 , the diagnosis unit 122 may determine whether the third result value is equal to or greater than a preset third reference value.

In the internal ignition occurrence diagnosis ( S340 ), the diagnosis unit 122 diagnoses that ignition has occurred inside the battery pack 100 when it is determined that the third result value is greater than or equal to the preset third reference value in the final judgment step ( S330 ). can do.

There is a difference between the first embodiment shown in FIG. 4 and the second embodiment shown in FIG. 5 in the presence or absence of the final determination step ( S330 ). That is, in the step of diagnosing the state of the battery pack ( S220 ), the diagnosis unit 122 compares the second result value with the second reference value in the second determination step ( S220 ), and based on this, the internal battery pack 100 . Although it is possible to diagnose that ignition has occurred, a final determination step ( S330 ) may be included for more accurate diagnosis because internal ignition may be erroneously diagnosed based on a one-time measurement error or temporary abnormality of the battery pack 100 . can

Meanwhile, in the step S200 of diagnosing the state of the battery pack, the diagnosis unit 122 may decrease the third result value when the first result value is less than a preset first reference value in the first determination step S310. . In this case, if the third result value is the initial setting value, the diagnosis unit 122 may not decrease the third result value.

As described above, in the step of diagnosing the state of the battery pack ( S200 ), the diagnosis unit 122 determines the voltage of at least one battery cell 111 , 112 , 113 , 114 , the temperature of the battery module 110 , and the battery pack. Based on the state of ( 100 ), it may be diagnosed whether internal ignition of the battery pack 100 has occurred. Accordingly, an accurate diagnosis may be possible.

Hereinafter, the steps S210 to S230 and the steps S310 to S340 will be described in more detail with reference to FIG. 6 .

6 is a flowchart illustrating in detail a method of operating a battery management apparatus according to an exemplary embodiment disclosed in this document.

Referring to FIG. 6 , in the method of operating the battery management apparatus according to an exemplary embodiment disclosed in this document, a measuring step ( S100 ), a first result value calculation step ( S311 ), and determining whether the first result value is equal to or greater than a first reference value step (S312), calculating the second result value (S321), determining whether the second result value is equal to or greater than the second reference value (S322), increasing the third result value (S331), the third result value is the third It may include a step (S332) of determining whether the reference value or more, a diagnosis of the occurrence of internal ignition (S341), and a step (S350) of reducing the third result value.

In the case of the measurement step S100, the voltage of the battery cells 111, 112, 113, and 114 shown in FIG. 3, the temperature of the battery module 110, the insulation resistance of the battery pack 100, and the voltage of the battery pack 100 It may be substantially the same as the measuring step (S100).

The first determination step ( S310 ) may include a step of calculating a first result value ( S311 ) and determining whether the first result value is equal to or greater than a first reference value ( S312 ).

The second determination step (S320) may include a step of calculating a second result value (S321) and a step of determining whether the second result value is equal to or greater than a second reference value (S322).

The final determination step S330 may include a step S331 of increasing the third result value and a step S332 of determining whether the third result value is equal to or greater than a third reference value.

The internal ignition generation diagnosis ( S341 ) may be substantially the same as the internal ignition generation diagnosis ( S340 ) illustrated in FIG. 5 .

In the step of reducing the third result value ( S350 ), the diagnosis unit 122 determines whether the first result value is equal to or greater than the first reference value ( S312 ). When it is determined that the first result value is less than the first reference value, the third result value can reduce In this case, when the third result value is the initial set value, the third result value may not be decreased.

Hereinafter, the first result value calculation step ( S311 ) and the second result value calculation step ( S321 ) will be described in detail with reference to FIGS. 7 and 8 .

First, FIG. 7 is a flowchart detailing the step of calculating the first result value ( S311 ) in the method of operating the battery management apparatus according to an exemplary embodiment disclosed in this document.

The step of calculating the first result value (S311) includes the step of determining whether the rate of decrease of the voltage of the at least one battery cell (111, 112, 113, 114) is equal to or greater than a specific value (S313), and the step of increasing the first result value (S314) ), and determining whether the temperature change rate of the battery module 110 satisfies a predetermined condition ( S315 ). The step of increasing the first result value ( S316 ) may be substantially the same as that of step S314 .

In the first result value calculation step S311 , the diagnosis unit 122 , based on the value measured by the measurement unit 121 in the measurement step S100 , determines the at least one battery cell 111 , 112 , 113 , 114 . It is determined whether the rate of decrease of the voltage is equal to or greater than a specific value (S313), and when the rate of decrease of the voltage of at least one battery cell 111, 112, 113, and 114 is equal to or greater than a specific value, the first result value may be increased (S314) . In addition, in the first result value calculation step (S311), the diagnosis unit 122 determines whether the temperature change rate of the battery module 110 satisfies a predetermined condition (S315), and the temperature change rate of the battery module 110 determines the temperature change rate of the predetermined condition (S315). When , the first result value may be increased (S316).

Meanwhile, step S315 described above may be performed simultaneously with step S313 or may be performed before step S313.

8 is a flowchart illustrating a second result value calculation step ( S321 ) in the operating method of the battery management apparatus according to an exemplary embodiment disclosed in this document.

The second result value calculation step (S321) is a step of determining whether the insulation resistance of the battery pack 100 is equal to or less than a threshold resistance value (S323), a second result value increasing step (S324), and the battery pack 100 It may include determining whether the voltage reduction is equal to or greater than a threshold voltage value (S325). The step of increasing the second result value ( S326 ) may be substantially the same as that of step S324 .

In the second result calculation step S321 , the diagnosis unit 122 determines whether the insulation resistance of the battery pack 100 is equal to or less than a threshold resistance value based on the value measured by the measurement unit 121 in the measurement step S100 . is determined ( S323 ), and when the insulation resistance of the battery pack 100 is equal to or less than the threshold resistance value, the second result value may be increased ( S324 ). Also, in the second result value calculation step S321 , the diagnosis unit 122 determines whether the voltage decrease of the battery pack 100 is equal to or greater than the threshold voltage value ( S325 ), and the voltage decrease of the battery pack 100 is equal to or greater than the threshold voltage value ( S325 ). In this case, the second result value may be increased (S326).

Meanwhile, step S325 described above may be performed simultaneously with step S323 or may be performed before step S323.

The above description is merely illustrative of the technical idea disclosed in this document, and those of ordinary skill in the art to which the embodiments disclosed in this document belong are not departing from the essential characteristics of the embodiments disclosed in this document. Various modifications and variations will be possible.

Accordingly, the embodiments disclosed in this document are for explanation rather than limiting the technical ideas disclosed in this document, and the scope of the technical ideas disclosed in this document is not limited by these embodiments. The scope of protection of the technical ideas disclosed in this document should be interpreted by the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present document.

100: battery pack
110: battery module
111, 112, 113, 114: a plurality of battery cells
120: battery management device
121: measurement unit
122: diagnostic unit

Claims (15)

a measuring unit configured to measure a voltage of at least one battery cell inside the battery pack, a temperature of a battery module inside the battery pack, an insulation resistance of the battery pack, and a voltage of the battery pack; and
and a diagnosis unit configured to diagnose a state of the battery pack based on a voltage of the at least one battery cell, a temperature of the battery module, an insulation resistance of the battery pack, and a voltage of the battery pack. The method of claim 1,
The diagnostic unit,
a first result value generated based on whether the rate of decrease of the voltage of the at least one battery cell is equal to or greater than a specific value and whether the rate of change of the temperature of the battery module satisfies a predetermined condition;
and diagnosing the state of the battery pack based on a second result value generated based on whether the insulation resistance of the battery pack is equal to or less than a threshold resistance value and whether the voltage reduction of the battery pack is equal to or greater than a threshold voltage value battery management device. 3. The method of claim 2,
The diagnostic unit,
When the rate of decrease of the voltage of the at least one battery cell is equal to or greater than the specific value, or when the rate of change of the temperature of the battery module satisfies the predetermined condition, the first result value is increased, and the first result value is the second value. 1 In case of more than the standard value
and determining whether an insulation resistance of the battery pack is equal to or less than the threshold resistance value and whether a voltage decrease of the battery pack is equal to or greater than the threshold voltage value. 4. The method of claim 3,
The diagnostic unit,
When the first result value is equal to or greater than the first reference value,
When the insulation resistance of the battery pack is equal to or less than the threshold resistance value or when the voltage decrease of the battery pack is equal to or greater than the threshold voltage value, the second result value is increased, and when the second result value is equal to or greater than the second reference value, the A battery management device, characterized in that it is diagnosed that internal ignition of the battery pack has occurred. 5. The method of claim 4,
The diagnostic unit,
If the second result value is greater than or equal to the second reference value, increase the third result value,
and diagnosing that the internal ignition has occurred when the third result value is equal to or greater than a third reference value. 6. The method of claim 5,
The diagnostic unit,
When the first result value is less than the first reference value, the battery management apparatus according to claim 1, wherein the third result value is decreased. 3. The method of claim 2,
The specific value is 25%, and the predetermined condition is a battery management device, characterized in that the rate of change of the temperature of the battery module exceeds 1°C/sec for 3 seconds. The method of claim 1,
The diagnostic unit,
A battery management apparatus, characterized in that continuously diagnoses the state of the battery pack for a predetermined period of time. measuring the voltage of at least one battery cell inside the battery pack, the temperature of the battery module inside the battery pack, the insulation resistance of the battery pack, and the voltage of the battery pack; and
and diagnosing the state of the battery pack based on the voltage of the at least one battery cell, the temperature of the battery module, the insulation resistance of the battery pack, and the voltage of the battery pack. 10. The method of claim 9,
Diagnosing the state of the battery pack comprises:
a first determination step of determining whether the rate of decrease of the voltage of the at least one battery cell is equal to or greater than a specific value and whether the rate of change of the temperature of the battery module satisfies a predetermined condition; and
and a second determination step of determining whether the insulation resistance of the battery pack is equal to or less than a threshold resistance value and whether the voltage reduction of the battery pack is equal to or greater than a threshold voltage value. 11. The method of claim 10,
The first determination step is,
a first result value calculating step of increasing a first result value when the rate of decrease of the voltage of the at least one battery cell is equal to or greater than the specific value or when the rate of change of the temperature of the battery module satisfies the predetermined condition; and
and determining whether the first result value is equal to or greater than a first reference value. 12. The method of claim 11,
The second determination step is
When it is determined in the first determination step that the first result value is greater than or equal to the first reference value,
a second result value calculating step of increasing a second result value when the insulation resistance of the battery pack is equal to or less than the threshold resistance value or when the voltage decrease of the battery pack is equal to or greater than the threshold voltage value; and
and determining whether the second result value is equal to or greater than a second reference value. 13. The method of claim 12
Diagnosing the state of the battery pack comprises:
and diagnosing that internal ignition of the battery pack has occurred when it is determined in the second determining step that the second result value is greater than or equal to the second reference value. 13. The method of claim 12,
Diagnosing the state of the battery pack comprises:
When it is determined in the second determination step that the second result value is equal to or greater than the second reference value, increasing the third result value, and a final determination step of determining whether the third result value is equal to or greater than the third reference value; ,
and diagnosing that the internal ignition has occurred when it is determined in the final determination step that the third result value is equal to or greater than the third reference value. 15. The method of claim 14,
Diagnosing the state of the battery pack comprises:
When the first result value of the first determination step is less than the first reference value, the operating method of the battery management apparatus, characterized in that for decreasing the third result value.

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