KR20230020279A - Battery management apparatus and operating method of the same - Google Patents

Abstract

A battery management device according to one embodiment disclosed in the present document may include: a measuring unit for measuring the voltage of at least one battery cell; and a controller which diagnoses a voltage abnormality of the at least one battery cell based on the voltage of the at least one battery cell, checks a battery cell voltage for each frequency of the specific battery cell when the voltage abnormality occurs in the specific battery cell among the at least one battery cell, and manages the voltage of the at least one battery cell based on the battery cell voltage for each frequency.

Description

BATTERY MANAGEMENT APPARATUS AND OPERATING METHOD OF THE SAME}

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

Recently, research and development on secondary batteries have been actively conducted. Here, the secondary battery is a battery capable of charging and discharging, and includes all of the conventional Ni/Cd batteries, Ni/MH batteries, and recent lithium ion batteries. Among secondary batteries, lithium ion batteries have the advantage of much higher energy density than 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 a power source for mobile devices. Recently, the use range has been expanded as a power source for electric vehicles, and it is attracting attention as a next-generation energy storage medium.

A battery management device must be able to accurately measure voltages of battery cells in order to manage them. When charging and discharging are performed through a power conversion device (PCS), voltages of battery cells may be incorrectly measured due to noise, and charging or discharging may not be performed due to an incorrectly diagnosed voltage abnormality of battery cells. . That is, for normal charging or discharging, the battery management device needs a method for removing noise when measuring battery cell voltage.

An object of the embodiments disclosed in this document is to provide a battery management device capable of accurately measuring a battery cell voltage by removing noise when measuring a battery cell voltage, and an operating method thereof.

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

An apparatus for battery management according to an embodiment disclosed in this document includes a measuring unit for measuring a voltage of at least one battery cell and diagnosing a voltage abnormality of at least one battery cell based on the voltage of the at least one battery cell, and When a voltage abnormality occurs in a specific battery cell among the at least one battery cell, the controller checks the battery cell voltage for each frequency of the specific battery cell and manages the voltage of the at least one battery cell based on the battery cell voltage for each frequency. can include

In an embodiment, the controller may exclude the battery cell voltage measured at the specific frequency when it is determined that noise is generated in the battery cell voltage measured at a specific frequency among the battery cell voltages for each frequency.

In one embodiment, the controller may determine that noise is generated at the specific frequency when the battery cell voltage of the specific frequency is higher than the average voltage by a reference value or more.

In one embodiment, the voltage abnormality of the at least one battery cell may include at least one of an overvoltage (OV), an undervoltage (UV), and a voltage imbalance (CIM).

In one embodiment, if a specific frequency is determined to be the frequency of noise based on the battery cell voltage for each frequency, the controller determines the voltage of the at least one battery cell obtained in a state in which the specific frequency is filtered out. An abnormal voltage of the at least one battery cell may be rediagnosed.

In one embodiment, the frequencies may include multiples of 60 Hz or 50 Hz.

In one embodiment, the controller measures the voltage of the at least one battery cell through the measuring unit while the at least one battery cell is being charged or discharged, and a specific battery cell among the at least one battery cell. When a voltage abnormality occurs, the charging or discharging process is stopped, and based on the battery cell voltage for each frequency of the specific battery cell, it is determined whether the voltage abnormality is a voltage abnormality caused by noise, and the voltage abnormality is determined as a voltage caused by noise. , the interrupted charging or discharging process may be resumed, and if it is determined that the voltage is not higher than the voltage caused by the noise, the discontinuation of the charging or discharging process may be maintained.

A method of operating a battery management device according to an embodiment disclosed in this document includes measuring a voltage of at least one battery cell, and determining a voltage of at least one battery cell higher than or equal to the voltage of the at least one battery cell based on the voltage of the at least one battery cell. diagnosing, checking the battery cell voltage for each frequency of the specific battery cell when a voltage abnormality occurs in a specific battery cell among the at least one battery cell, and the voltage of the at least one battery cell based on the battery cell voltage for each frequency It may include steps to manage.

In one embodiment, the managing the voltage of the at least one battery cell based on the battery cell voltage for each frequency may include determining whether or not noise occurs at a specific frequency among the battery cell voltages for each frequency and the specific battery cell voltage for each frequency. Excluding the measured battery cell voltage from the frequency may be included.

In one embodiment, if it is determined that noise occurs at the specific frequency, the step of excluding the measured voltage of the specific frequency may include noise occurring at the specific frequency when the battery cell voltage of the specific frequency is higher than the average voltage by a reference value or more. can be judged to be

In one embodiment, the voltage abnormality of the at least one battery cell may include at least one of an overvoltage (OV), an undervoltage (UV), and a voltage imbalance (CIM).

In one embodiment, when a specific frequency is determined to be a frequency of noise based on the battery cell voltage for each frequency, the at least one battery cell voltage obtained in a state in which the specific frequency is filtered out is used to determine the frequency of the at least one battery cell. The method may further include rediagnosing an abnormal voltage of the battery cell.

In one embodiment, the frequencies may include multiples of 60 Hz or 50 Hz.

In one embodiment, the voltage of the at least one battery cell is measured through the measuring unit while the at least one battery cell is being charged or discharged, and when an abnormal voltage occurs in a specific battery cell among the at least one battery cell. The charging or discharging process is stopped, and based on the battery cell voltage for each frequency of the specific battery cell, it is determined whether the voltage abnormality is a voltage abnormality caused by noise, and if the voltage abnormality is confirmed as a voltage abnormality caused by noise, the voltage abnormality is stopped. The charging or discharging process may be resumed, and if it is determined that the voltage abnormality is not the voltage abnormality caused by noise, the step of maintaining the charging or discharging process is stopped.

A battery management device and method of operation thereof according to an embodiment disclosed in this document measure a battery cell voltage for each frequency and identify a frequency component in which noise occurs when a voltage abnormality of a battery cell is diagnosed based on the battery cell voltage. The battery cell voltage may be accurately measured by filtering the battery cell voltage measured at the corresponding frequency.

In addition to this, various effects identified directly or indirectly through this document may be provided.

1 is a diagram showing a battery pack according to an embodiment disclosed in this document.
2 is a diagram showing a battery management device according to an embodiment disclosed in this document.
3 is a diagram illustrating an example of filtering a voltage measured at a specific frequency in a battery management device according to an embodiment disclosed herein.
4 is a block diagram showing a battery management device according to another embodiment disclosed in this document.
5 is a flowchart illustrating an operating method of a battery management device according to an exemplary embodiment disclosed in this document.
6 and 7 are flowcharts showing a method of operating a battery management device according to an exemplary embodiment disclosed in this document in more detail.
8 is a flowchart illustrating an operating method of a battery management device according to another exemplary embodiment disclosed herein.
9 is a block diagram illustrating a hardware configuration of a computing system implementing a method for controlling a battery management device according to an exemplary embodiment disclosed herein.

Hereinafter, embodiments disclosed in this document will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed 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 understanding of the embodiment disclosed in this document, the detailed description thereof will be omitted.

Terms such as first, second, A, B, (a), and (b) may be used to describe components of the embodiments disclosed in this document. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person 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 unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

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

Referring to FIG. 1 , a battery pack 10 according to an embodiment disclosed herein may include a battery module 100 , a battery management device 200 , and a relay 300 .

The battery module 100 may include a plurality of battery cells 110 , 120 , 130 , and 140 . Although the number of battery cells is illustrated in FIG. 1 as four, it is not limited thereto, and the battery module 100 may include n (n is a natural number equal to or greater than 2) battery cells. The battery module 100 may supply power to a target device (not shown). To this end, the battery module 100 may be electrically connected to the target device. Here, the target device may include an electrical, electronic, or mechanical device operated by receiving power from the battery pack 10 including the plurality of battery cells 110 , 120 , 130 , and 140 .

The plurality of battery cells 110, 120, 130, and 140 include a lithium ion (Li-ion) battery, a lithium ion polymer (Li-ion polymer) battery, a nickel cadmium (Ni-Cd) battery, a nickel hydrogen (Ni-MH) It may be a battery or the like, but is not limited thereto. Meanwhile, although FIG. 1 shows a case in which one battery module 100 is provided, a plurality of battery modules 100 may be configured according to embodiments.

The battery management device 200 may manage and/or control the state and/or operation of the battery module 100 . For example, the battery management device 200 may manage and/or control states and/or operations of the plurality of battery cells 110, 120, 130, and 140 included in the battery module 100. The battery management device 200 may manage charging and/or discharging of the battery module 100 .

In addition, the battery management device 200 includes voltage, current, and voltage of each of the plurality of battery cells 110, 120, 130, and 140 included in the battery pack 10, the battery module 100, and/or the battery module 100. Temperature, insulation resistance, etc. can be monitored. For example, the battery management device 200 may measure or calculate voltages for each frequency of the plurality of battery cells 110 , 120 , 130 , and 140 . In addition, for monitoring by the battery management device 200, sensors or various measurement modules (not shown) may be additionally installed in a charging/discharging path or an arbitrary position such as the battery module 100. The battery management device 200 determines a parameter representing the state of the battery module 100, for example, State of Charge (SOC) or State of Health (SOH), based on measured values such as monitored voltage, current, and temperature. can be calculated

The battery management device 200 may control the operation of the relay 300 . For example, the battery management device 200 may short-circuit the relay 300 to supply power to the target device. Also, the battery management device 200 may short-circuit the relay 300 when a charging device is connected to the battery pack 10 .

The battery management device 200 according to an embodiment disclosed in this document may measure or calculate the voltage of each of the plurality of battery cells 110, 120, 130, and 140 and the voltage for each frequency, and the plurality of battery cells 110 , 120, 130, 140) voltage can be managed.

2 is a diagram showing a battery management device according to an embodiment disclosed in this document.

Referring to FIG. 2 , the battery management device 200 according to an embodiment disclosed in this document may include a measurement unit 210 and a controller 210 . In one embodiment, the battery management device 200 may be substantially the same as the battery management device 200 of FIG. 1 .

The measurement unit 210 may measure the voltage of at least one battery cell. For example, the measurement unit 210 may measure the voltage of each of at least one battery cell. The measuring unit 210 may transmit the measured voltage of at least one battery cell to the controller 220 .

In one embodiment, the measurer 210 may measure the voltage of at least one battery cell for each frequency. For example, the measurement unit 210 may measure the voltage of at least one battery cell for each preset frequency. In another example, the measurement unit 210 measures the voltage of at least one battery cell for each frequency by measuring a peak value of the voltage of each of the at least one battery cell through sampling for each frequency component. can In one embodiment, since the frequency at which the PCS (inverter) operates is 60 Hz or 50 Hz, the frequency may include multiples of 60 Hz or 50 Hz. In other embodiments, the frequency may include any set frequency.

The controller 220 may determine a voltage abnormality of at least one battery cell based on the voltage of at least one battery cell. For example, the voltage abnormality of at least one battery cell may include at least one of an overvoltage (OV), an undervoltage (UV), and a voltage imbalance (CIM).

The controller 220 may check the battery cell voltage for each frequency of the specific battery cell when an abnormal voltage occurs in a specific battery cell among at least one battery cell. For example, when it is determined that a voltage abnormality (eg, overvoltage, undervoltage, or voltage imbalance) of a specific battery cell among at least one battery cell has occurred, the controller 220 determines the battery cell voltage for each frequency of the specific battery cell by measuring unit (210).

The controller 220 may manage the voltage of at least one battery cell based on the battery cell voltage for each frequency. For example, the controller 220 may determine the frequency at which noise occurs among the battery cell voltages for each frequency, and based on the frequency component at which noise is generated, the battery cell voltage measured at the remaining frequencies except for the frequency affected by the noise is determined. It is possible to determine the voltage of the battery cell. For another example, the controller 220 may exclude the battery cell voltage measured at a specific frequency when it is determined that noise is generated in the battery cell voltage measured at a specific frequency among the battery cell voltages for each frequency. That is, the controller 220 may accurately measure the voltage of at least one battery cell by measuring the voltage of the battery cell by filtering the cell voltage measured at the frequency at which noise is determined to occur.

The controller 220 may determine that noise is generated at the specific frequency when the battery cell voltage of the specific frequency is higher than the average voltage by a reference value or more. For example, the controller 220 may check the battery cell voltage for each frequency, and when the battery cell voltage of a specific frequency is higher than a reference value than the average value of the battery cell voltage for each frequency, the battery cell voltage measured at the specific frequency has noise. may be determined to have occurred, and the battery cell voltage measured at a specific frequency may be filtered.

3 is a diagram illustrating an example of filtering a voltage measured at a specific frequency in a battery management device according to an embodiment disclosed herein.

)보다 기 설정값(

) 이상 차이가 존재하는 경우에 특정 주파수(X)에서 측정되는 배터리 셀의 전압을 제외할 수 있다. 도 3에서는 특정 주파수(X)가 한 개인 경우만 도시하고 있지만 이에 한정되지 않고, 컨트롤러(220)는 m(m은 1이상의 자연수)개의 특정 주파수에서 측정되는 배터리 셀의 전압이 평균 전압(

)보다 기 설정값(

) 이상 차이가 존재하는 경우, m개의 특정 주파수에서 측정되는 배터리 셀의 전압을 모두 제외할 수 있다. Referring to FIG. 3 , the controller 220 may obtain a voltage for each frequency of a specific battery cell from the measuring unit 210 . In this case, the specific battery cell may be a battery cell for which a voltage abnormality has been diagnosed. The controller 220 determines that the voltage at a specific frequency (X) among the voltages for each frequency of a specific battery cell is an average voltage (

) than the previous set value (

), the voltage of the battery cell measured at a specific frequency (X) may be excluded when there is an abnormal difference. In FIG. 3, only one specific frequency (X) is shown, but is not limited thereto, and the controller 220 determines that the voltage of the battery cell measured at m (m is a natural number equal to or greater than 1) specific frequency is the average voltage (

) than the previous set value (

), all voltages of battery cells measured at m specific frequencies may be excluded.

Although the graph is shown as continuously drawn in FIG. 3 , the measuring unit 210 may discretely measure the battery cell voltage for each frequency. That is, the controller 220 may receive discrete battery cell voltages measured for each frequency, and determine a specific frequency at which noise occurs based on the battery cell voltages measured for each frequency.

Referring back to FIG. 2 , in one embodiment, the controller 220 may filter out the specific frequency when it is determined that the specific frequency is a frequency where noise is generated based on the battery cell voltage for each frequency. In addition, the controller 220 may obtain the voltage of at least one battery cell again in a state in which a specific frequency is filtered out, and based on the obtained voltage of the at least one battery cell, the controller 220 may obtain a voltage higher than or equal to the voltage of the at least one battery cell. can be re-diagnosed. For example, the controller 220 may determine whether noise occurs at a specific frequency, exclude the battery cell voltage measured at the specific frequency, and again measure at least one battery cell voltage measured through the measurement unit 210. The voltage of at least one battery cell may be rediagnosed by obtaining the voltage of the battery cell.

In one embodiment, the controller 220 may measure the voltage of the at least one battery cell using the measurement unit 210 while the at least one battery cell is being charged or discharged, and the measured voltage of the at least one battery cell may be measured. voltage can be obtained. The controller 220 may determine whether a voltage abnormality occurs in a specific battery cell among at least one battery cell, and may stop a charging or discharging process when it is determined that a voltage abnormality occurs in a specific battery cell. At this time, the controller 220 may check whether the voltage abnormality is caused by noise based on the battery cell voltage for each frequency of the specific battery cell in which the voltage abnormality occurs, and if it is determined that the voltage abnormality is caused by noise, the controller 220 stops the voltage abnormality. The charging and discharging process can be resumed. For another example, if the voltage higher than the voltage generated by a specific battery cell is not higher than the voltage caused by noise, the controller 220 may continue to stop the charging or discharging process.

The battery management device 200 disclosed in this document operates the controller 220 based on the voltage of each of the at least one battery cell measured by the measurement unit 210 and the voltage of each of the at least one battery cell for each frequency. Noise present in the voltage of at least one battery cell may be filtered. For example, when an abnormal voltage of a specific battery cell among at least one battery cell occurs in the controller 220, the battery management device 200 may check the voltage for each frequency of the specific battery cell and the cell voltage of the specific frequency. When it is determined that there is noise, the voltage of at least one battery cell can be accurately measured without noise by measuring the voltage of at least one battery cell again except for a specific frequency. The battery management device 200 may diagnose an operation (eg, charging or discharging) of a battery pack (eg, the battery pack 10 of FIG. 1 ) based on the accurately measured voltage of at least one battery cell.

4 is a block diagram showing a battery management device according to another embodiment disclosed in this document.

Referring to FIG. 4 , a battery management device 400 according to another embodiment disclosed in this document may include a measuring unit 410 , a controller 420 and a storage unit 430 . In one embodiment, the battery management device 400 may be substantially the same as the battery management device 200 of FIG. 1 . In one embodiment, the measurement unit 410 may be substantially the same as the measurement unit 210 of FIG. 2 , and the controller 420 may be substantially the same as the controller 220 of FIG. 2 .

The storage unit 430 may store information about a specific frequency at which noise occurs. For example, the controller 420 may store information on a specific frequency at which noise is determined to be generated in the storage unit 430, and then, when an abnormal voltage of at least one battery cell is diagnosed, the storage unit 430 The voltage of at least one battery cell may be measured by previously excluding the voltage of the battery cell of a specific frequency stored in .

In one embodiment, the controller 420 may transmit a specific frequency value stored in the storage unit 430 to an external device. For example, the controller 420 may continuously store a specific frequency value at which noise occurs in the storage unit 430, and when noise occurs at a specific frequency value more than a predetermined number of times, the specific frequency value is transmitted to an external device. By transmitting the value, another device can measure the voltage of at least one battery cell except for a specific frequency. For another example, the controller 420 may allow the external device to determine the cause of noise by transmitting a specific frequency value at which noise is generated to the external device. According to an embodiment, the battery management device 400 may further include a communication unit (not shown), and the controller 420 may transmit a specific frequency value to an external device through the communication unit (not shown).

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

Referring to FIG. 5 , the operating method of the battery management device 200 according to an embodiment disclosed in this document includes measuring the voltage of at least one battery cell ( S110 ), based on the voltage of the at least one battery cell. Diagnosing a voltage abnormality of at least one battery cell (S120), checking the battery cell voltage for each frequency of a specific battery cell when a voltage abnormality occurs in a specific battery cell among at least one battery cell (S130), and battery per frequency A step of managing the voltage of at least one battery cell based on the cell voltage ( S140 ) may be included.

In the step of measuring the voltage of at least one battery cell ( S110 ), the measuring unit 210 may measure the voltage of at least one battery cell. For example, the measurer 210 may directly measure the voltage of at least one battery cell or may obtain the measured voltage of at least one battery cell from another device that measures the voltage of at least one battery cell. there is.

In step S120 of diagnosing an abnormal voltage of the at least one battery cell based on the voltage of the at least one battery cell, the controller 220 determines the voltage of the at least one battery cell based on the measured voltage of the at least one battery cell. abnormalities can be diagnosed. For example, the voltage abnormality of at least one battery cell may include at least one of an overvoltage (OV), an undervoltage (UV), and a voltage imbalance (CIM).

When a voltage abnormality occurs in a specific battery cell among at least one battery cell, in step S130 of checking the battery cell voltage for each frequency of the specific battery cell, the controller 220 judges that the voltage abnormality in the specific battery cell among the at least one battery cell has occurred. When the determination is made, the battery cell voltage for each frequency of a specific battery cell may be checked. For example, the controller 220 may determine the measured battery cell voltage for each frequency by having the measurement unit 210 measure the battery cell voltage for each frequency of a specific battery cell.

In step S140 of managing the voltage of at least one battery cell based on the battery cell voltage for each frequency, the controller 220 may manage the voltage of at least one battery cell based on the battery cell voltage for each frequency. For example, the controller 220 may manage the voltage of at least one battery cell by checking the battery cell voltage for each frequency and checking the frequency at which noise exists. For another example, the controller 220 may exclude the measurement voltage of a specific frequency when it is determined that noise occurs at a specific frequency. That is, in step S140, the controller 220 may exclude a specific frequency determined to have noise from the measurement target, and measure the voltage of at least one battery cell again to accurately measure the voltage of at least one battery cell. can

6 and 7 are flowcharts showing a method of operating a battery management device according to an exemplary embodiment disclosed in this document in more detail.

Referring to FIG. 6 , the operating method of the battery management device 200 according to an embodiment disclosed in this document includes measuring a voltage of at least one battery cell ( S210 ), and detecting an error in the voltage of at least one battery cell. Diagnosing (S220), measuring the voltage of at least one battery cell for each frequency (S230), checking the battery cell voltage for each frequency of a specific battery cell (S240), measuring the battery cell voltage at a specific frequency It may include determining whether noise is generated ( S250 ), excluding the battery cell voltage measured at a specific frequency ( S260 ), and determining whether the battery cell voltage is higher than or equal to a specific battery cell voltage ( S270 ).

In the step of measuring the voltage of at least one battery cell ( S210 ), the measuring unit 210 may measure the voltage of at least one battery cell. For example, step S210 may be substantially the same as step S110 of FIG. 5 .

In the step of diagnosing an abnormal voltage of at least one battery cell ( S220 ), the controller 220 may diagnose an abnormal voltage of at least one battery cell. For example, step S220 may be substantially the same as step S120 of FIG. 5 . In one embodiment, when it is diagnosed that there is an abnormal voltage of a specific battery cell in step S220, the controller 220 may perform step S230. In another embodiment, the controller 220 may end the operation without performing steps S230 to S250 when the voltage abnormality of the specific battery cell is not diagnosed.

In the step of measuring the voltage of at least one battery cell for each frequency ( S230 ), the measurement unit 210 may measure the voltage of at least one battery cell for each frequency. For example, when the controller 220 determines that a voltage abnormality is detected in a specific battery cell, the measurement unit 210 may measure the voltage of the specific battery cell for each frequency. For another example, the measurer 210 may measure the voltage of all at least one battery cell for each frequency and transmit the measured voltage to the controller 220 . In one embodiment, the frequencies may include multiples of 60 Hz or 50 Hz. In another embodiment, the frequency may include preset frequency values. In another embodiment, step S230 may be included in step S210 and performed.

In step S240 of checking the battery cell voltage for each frequency of the specific battery cell, the controller 220 may check the battery cell voltage for each frequency of the specific battery cell. For example, the controller 220 may check the voltage for each frequency of a specific battery cell determined to have a voltage abnormality.

In the step of determining whether noise occurs in the battery cell voltage measured at a specific frequency (S250), the controller 220 determines whether noise occurs in the battery cell voltage measured at a specific frequency among the battery cell voltages for each frequency. can For example, the controller 220 may determine that noise occurs at the specific frequency when the battery cell voltage measured at the specific frequency is higher than the average of the battery cell voltages measured at all frequencies by a reference value or more. In one embodiment, step S250 may be included in step S140 of FIG. 5 .

In the step of excluding the battery cell voltage measured at the specific frequency (S260), the controller 220 may exclude the battery cell voltage measured at the specific frequency when it is determined that noise occurs in the battery cell voltage measured at the specific frequency. . For example, the controller 220 may diagnose whether or not the voltage of at least one battery cell is abnormal again based on the battery cell voltage measured at the frequency other than the battery cell voltage measured at the specific frequency.

In determining that the voltage of the specific battery cell is higher than or equal to (S270), the controller 220 may determine that the voltage of the specific battery cell is higher than the voltage of the specific battery cell when it is determined that noise does not occur in the voltage of the battery cell measured at the specific frequency. At this time, the battery management device 200 may perform an operation (eg, notification to a user, cell balancing, stopping use of a battery, etc.) to manage the voltage of a specific battery cell.

Referring to FIG. 7 , in the operating method of the battery management device 200 according to an embodiment disclosed in this document, when a specific frequency is determined to be the frequency of noise based on a battery cell voltage for each frequency, the specific frequency is filtered out. Re-diagnosing an abnormal voltage of at least one battery cell based on the voltage of at least one battery cell obtained in the state (S310) and at least one battery cell through a measurement unit while a charging or discharging process of at least one battery cell is performed. Measures the voltage of a battery cell, stops the charging or discharging process when a voltage abnormality occurs in a specific battery cell among at least one battery cell, and the voltage abnormality is abnormal based on the battery cell voltage for each frequency of the specific battery cell. confirmation, and if the voltage abnormality is confirmed as a voltage abnormality caused by noise, resuming the interrupted charging or discharging process, and if it is confirmed that the voltage abnormality is not a voltage abnormality caused by noise, maintaining the interruption of the charging or discharging process ( S320) may be further included.

If a specific frequency is determined to be the frequency of noise based on the battery cell voltage for each frequency, the voltage abnormality of at least one battery cell is rediagnosed based on the voltage of at least one battery cell obtained in a state in which the specific frequency is filtered out. In step S310, the controller 220 may determine whether a specific frequency is the frequency of noise based on the battery cell voltage for each frequency. When it is determined that noise occurs at a specific frequency, the controller 220 may obtain the voltage of at least one battery cell measured through the measurement unit 210 in a state in which the specific frequency is filtered out, and the obtained at least one An abnormal voltage of at least one battery cell may be rediagnosed based on the voltage of the battery cell. In this case, when the voltage abnormality of at least one battery cell is continuously diagnosed, the controller 220 may determine that the battery cell voltage is abnormal and terminate the charging or discharging process. For another example, if the controller 220 determines that the voltage abnormality does not exist as a result of rediagnosing the voltage abnormality of at least one battery cell after filtering out the frequency at which the noise occurs, the initial diagnosis is incorrect and the charging or discharging process is performed. can keep In one embodiment, step S310 may be performed after step S130 of FIG. 5 .

In step S320, the controller 220 may measure the voltage of at least one battery cell through the measurement unit 210 while the charging or discharging process of the at least one battery cell is performed, and may measure the voltage of the at least one battery cell of the specific battery cell. The charging or discharging process can be stopped when a voltage abnormality occurs. At this time, the controller 220 may check whether the voltage abnormality is the voltage abnormality caused by the noise based on the battery cell voltage for each frequency of the specific battery cell, and if the voltage abnormality is confirmed as the voltage abnormality caused by the noise, the charging or discharging is stopped. process can be resumed. The controller 220 may continue to stop the charging or discharging process when it is confirmed that the voltage abnormality is not caused by noise.

Referring to FIG. 8 , an operating method of a battery management device 400 according to another embodiment disclosed in this document includes measuring the voltage of at least one battery cell ( S410 ), based on the voltage of the at least one battery cell. Diagnosing an abnormal voltage of at least one battery cell (S420), checking the battery cell voltage for each frequency of a specific battery cell when an abnormal voltage occurs in a specific battery cell among at least one battery cell (S430), battery cell for each frequency It may include managing the voltage of at least one battery cell based on the voltage ( S440 ) and storing information about a specific frequency at which noise occurs ( S450 ).

In step S410 of measuring the voltage of at least one battery cell, the measurement unit 410 may measure the voltage of at least one battery cell. For example, step S410 may be substantially the same as step S110 of FIG. 5 .

In step S420 of diagnosing an abnormal voltage of the at least one battery cell based on the voltage of the at least one battery cell, the controller 420 detects an abnormal voltage of the at least one battery cell based on the voltage of the at least one battery cell. can be diagnosed For example, step S420 may be substantially the same as step S120 of FIG. 5 .

When a voltage abnormality occurs in a specific battery cell among at least one battery cell, in the step of checking the battery cell voltage for each frequency of the specific battery cell (S430), the controller 420 determines if the voltage abnormality occurs in a specific battery cell among the at least one battery cell. You can check the battery cell voltage for each frequency of a specific battery cell. For example, step S430 may be substantially the same as step S130 of FIG. 5 .

In step S440 of managing the voltage of at least one battery cell based on the battery cell voltage for each frequency, the controller 420 may manage the voltage of at least one battery cell based on the battery cell voltage for each frequency. For example, step S440 may be substantially the same as step S140 of FIG. 5 . In an embodiment, the controller 420 may determine a specific frequency at which noise occurs in the cell voltage based on the battery cell voltage for each frequency, and may exclude a battery cell voltage measured corresponding to the specific frequency.

In step S450 of storing information about a specific frequency where noise occurs, the controller 420 may store information about a specific frequency where noise occurs in the storage unit 430 . For example, when determining whether a voltage abnormality has occurred in a battery cell, the controller 420 may exclude a voltage measured in response to a specific frequency at which noise occurs.

9 is a block diagram illustrating a hardware configuration of a computing system implementing a method for controlling a battery management device according to an exemplary embodiment disclosed herein.

Referring to FIG. 9 , a computing system 1000 according to an embodiment disclosed in this document may include an MCU 1010, a memory 1020, an input/output I/F 1030 and a communication I/F 1040. there is.

The MCU 1010 executes various programs (eg, a battery cell voltage measurement program, a switching control program, etc.) stored in the memory 1020, and through these programs, various data including the voltage and internal resistance of the battery cell are displayed. It may be a processor that processes data and performs functions of the battery management device 200 shown in FIG. 2 described above.

The memory 1020 may store various programs related to voltage measurement or switching control of a battery cell. In addition, the memory 1020 may store various data such as voltage or internal resistance of a battery cell.

A plurality of such memories 1020 may be provided as needed. The memory 1020 may be a volatile memory or a non-volatile memory. The memory 1020 as a volatile memory may be RAM, DRAM, SRAM, or the like. The memory 1020 as a non-volatile memory may be ROM, PROM, EAROM, EPROM, EEPROM, flash memory, or the like. The examples of the memories 1020 listed above are merely examples and are not limited to these examples.

The input/output I/F 1030 connects an input device (not shown) such as a keyboard, mouse, or touch panel, an output device such as a display (not shown), and the MCU 1010 to transmit and receive data. can provide.

The communication I/F 1040 is a component capable of transmitting and receiving various data to and from the server, and may be various devices capable of supporting wired or wireless communication. For example, a program for voltage measurement and switching control of a battery cell or various data may be transmitted and received from a separately prepared external server through the communication I/F 1040 .

As such, the computer program according to an embodiment disclosed in this document is recorded in the memory 1020 and processed by the MCU 1010, so that, for example, it may be implemented as a module that performs each function shown in FIG. 2. there is.

The above description is only an illustrative example of the technical idea disclosed in this document, and those skilled in the art to which the embodiments disclosed in this document belong will be within the scope of the essential characteristics of the embodiments disclosed in this document. Many modifications and variations will be possible.

Therefore, the embodiments disclosed in this document are not intended to limit the technical idea disclosed in this document, but to explain, and the scope of the technical idea disclosed in this document is not limited by these embodiments. The scope of protection of technical ideas disclosed in this document should be interpreted according to the scope of the following claims, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of this document.

10: battery pack
100: battery module
110, 120, 130, 140: a plurality of battery cells
200, 400: battery management device
210, 410: measuring unit
220, 420: controller
300: relay
430: storage unit
1000: computing system
1010: MCU
1020: memory
1030: I/O I/F
1040: communication I/F

Claims (14)

a measuring unit measuring a voltage of at least one battery cell; and
Diagnosing an abnormal voltage of the at least one battery cell based on the voltage of the at least one battery cell;
Checking the battery cell voltage for each frequency of the specific battery cell when a voltage abnormality occurs in a specific battery cell among the at least one battery cell;
and a controller managing the voltage of the at least one battery cell based on the battery cell voltage for each frequency. According to claim 1,
The controller,
The battery management device, characterized in that, if it is determined that noise is generated in the battery cell voltage measured at a specific frequency among the battery cell voltages for each frequency, the battery cell voltage measured at the specific frequency is excluded. According to claim 2,
The controller,
The battery management device, characterized in that determining that noise occurs at the specific frequency when the battery cell voltage of the specific frequency is higher than the average voltage by a reference value or more. According to claim 2,
The battery management device of claim 1, wherein the voltage abnormality of the at least one battery cell includes at least one of an overvoltage (OV), an undervoltage (UV), and a voltage imbalance (CIM). According to claim 1,
The controller,
If a specific frequency is determined to be the frequency of noise based on the battery cell voltage for each frequency, the voltage of the at least one battery cell is greater than or equal to the voltage of the at least one battery cell based on the voltage of the at least one battery cell obtained in a state in which the specific frequency is filtered out. A battery management device characterized in that for rediagnosing. According to claim 1,
The battery management device, characterized in that the frequency comprises a multiple of 60Hz or 50Hz. According to claim 1,
The controller,
Measuring the voltage of the at least one battery cell through the measurement unit while the at least one battery cell is being charged or discharged;
Stopping the charging or discharging process when a voltage abnormality occurs in a specific battery cell among the at least one battery cell;
Based on the battery cell voltage for each frequency of the specific battery cell, it is determined whether the voltage abnormality is a voltage abnormality caused by noise,
When the voltage abnormality is confirmed as a voltage abnormality caused by noise, the interrupted charging or discharging process is resumed, and when it is confirmed that the voltage abnormality is not a voltage abnormality caused by noise, the charging or discharging process is stopped. battery management device. measuring the voltage of at least one battery cell;
diagnosing an abnormal voltage of the at least one battery cell based on the voltage of the at least one battery cell;
checking a battery cell voltage for each frequency of the specific battery cell when a voltage abnormality occurs in a specific battery cell among the at least one battery cell; and
managing a voltage of the at least one battery cell based on the battery cell voltage for each frequency; A method of operating a battery management device comprising a. According to claim 8,
Managing the voltage of the at least one battery cell based on the battery cell voltage for each frequency,
determining whether noise is generated in a battery cell voltage measured at a specific frequency among the battery cell voltages for each frequency; and
excluding the battery cell voltage measured at the specific frequency; A method of operating a battery management device comprising: According to claim 9,
If it is determined that noise occurs at the specific frequency, the step of excluding the measured voltage of the specific frequency,
A method of operating a battery management device, characterized in that determining that noise occurs at the specific frequency when the battery cell voltage of the specific frequency is higher than the average voltage by a reference value or more. According to claim 9,
The method of operating a battery management device, characterized in that the voltage abnormality of the at least one battery cell includes at least one of an overvoltage (OV), an undervoltage (UV), and a voltage imbalance (CIM). According to claim 8,
If a specific frequency is determined to be the frequency of noise based on the battery cell voltage for each frequency, the voltage of the at least one battery cell is greater than or equal to the voltage of the at least one battery cell based on the voltage of the at least one battery cell obtained in a state in which the specific frequency is filtered out. rediagnosing; A method of operating a battery management device further comprising. According to claim 8,
The method of operating a battery management device, characterized in that the frequency comprises a multiple of 60Hz or 50Hz. According to claim 8,
Measuring the voltage of the at least one battery cell through the measurement unit while the at least one battery cell is being charged or discharged;
Stopping the charging or discharging process when a voltage abnormality occurs in a specific battery cell among the at least one battery cell;
Based on the battery cell voltage for each frequency of the specific battery cell, it is determined whether the voltage abnormality is a voltage abnormality caused by noise,
resuming the interrupted charging or discharging process when the voltage abnormality is confirmed as a voltage abnormality caused by noise, and maintaining the interruption of the charging or discharging process when it is confirmed that the voltage abnormality is not a voltage abnormality caused by noise; A method of operating a battery management device further comprising.

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