KR101782223B1 - Apparatus for Diagnosing Battery Conditioning System, Energy Storage System including That Apparatus - Google Patents

Apparatus for Diagnosing Battery Conditioning System, Energy Storage System including That Apparatus Download PDF

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KR101782223B1
KR101782223B1 KR1020150152147A KR20150152147A KR101782223B1 KR 101782223 B1 KR101782223 B1 KR 101782223B1 KR 1020150152147 A KR1020150152147 A KR 1020150152147A KR 20150152147 A KR20150152147 A KR 20150152147A KR 101782223 B1 KR101782223 B1 KR 101782223B1
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South Korea
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battery
impedance
unit
current
battery unit
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KR1020150152147A
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Korean (ko)
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KR20170050519A (en
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이종학
인동석
김태형
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주식회사 포스코아이씨티
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    • G01R31/3662—
    • G01R31/3624—
    • G01R31/3658—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing

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  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

A battery control system diagnostic apparatus according to an aspect of the present invention, which can diagnose a state of a battery unit based on an impedance of a battery unit, includes: a current state detecting unit for detecting a current state of one or more battery units constituting a battery conditioning system A comparison unit comparing the first current at the previous time and the second current at the previous time; An impedance calculating unit for calculating an impedance at a current time point of the battery unit when the first current and the second current are different; And an error determination unit comparing the impedance at the current time with a predetermined impedance limit value and determining that an error has occurred in the battery unit when the impedance at the current time is different from the impedance limit value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery control system diagnostic apparatus and an energy storage system including the same,

The present invention relates to an energy storage system, and more particularly to the diagnosis of a battery conditioning system included in an energy storage system.

With the development of the industry, electric power demand is gradually increasing, and the gap between day and night, season, and day is widening.

Recently, many techniques for reducing the peak load by utilizing the surplus power of the system have been rapidly developed for this reason. One of these technologies is to store the surplus power of the system in a battery or to supply energy And an energy storage system (ESS).

The energy storage system stores the surplus power at night or the power generated from renewable energy sources such as wind and sunlight, and supplies the power stored in the battery to the system during a peak load or a system accident. This will stabilize the system power unstably fluctuating by the renewable energy source and achieve maximum load reduction and load leveling.

In particular, such an energy storage system can be used in electric vehicles as well as smart grids due to recent emergence of various renewable energy sources.

A typical energy storage system may constitute a battery unit (e.g., a battery module, a battery rack, a battery rack group, or the like) with a plurality of batteries due to the limitation of battery packing technology.

However, the conventional energy storage system can manage the battery only on the basis of the information of the battery (for example, the temperature of the battery, the voltage of the battery, and the current of the battery) Unit, battery rack unit, or battery rack group).

Therefore, even if a problem occurs in the connection state between the battery units, or when the connection part between the battery units is burned or the like, there is no way to confirm the connection state, thereby causing a problem in the connection state between the battery units, The battery may be charged and discharged in a state where the battery is burned or the like, and the cable connecting the battery units may melt or fire due to the heat generated by the battery.

Korean Patent Publication No. 10-2009-0046474 (June 11, 2009)

The present invention has been made to solve the above-mentioned problems, and it is a technical object of the present invention to provide a diagnostic apparatus for a battery control system capable of diagnosing the state of a battery unit based on an impedance of the battery unit and an energy storage system including the same .

It is another object of the present invention to provide a diagnostic apparatus for a battery control system and an energy storage system including the same, which can diagnose a cause of an error when a failure occurs in a battery unit.

According to an aspect of the present invention, there is provided an apparatus for diagnosing a battery conditioning system, the apparatus comprising: a first current detector for detecting a first current at a current time point of one or more battery units constituting a battery conditioning system (BCS) A comparator for comparing a second current of the first transistor; An impedance calculating unit for calculating an impedance at a current time point of the battery unit when the first current and the second current are different; And an error determination unit comparing the impedance at the current time with a predetermined impedance limit value and determining that an error has occurred in the battery unit when the impedance at the current time is different from the impedance limit value.

According to another aspect of the present invention, there is provided an energy storage system including a battery conditioning system (BCS) comprising at least one battery unit; A power conditioning system (PCS) for charging or discharging the battery unit according to a charge / discharge command value; And a power management system (PMS) for determining the charge / discharge command value and controlling operations of the battery control system and the power control system according to the charge / discharge command value, And an error determination unit comparing the impedance of the battery unit with a predetermined impedance limit value to determine whether or not an error has occurred in the battery unit.

According to the present invention, it is possible to diagnose the state of the battery unit based on the impedance of the battery unit composed of the battery module, the battery rack, and the battery rack group, so as to determine in advance whether the connection state between the battery units or the connection part is burned out There is an effect that can be done.

In addition, according to the present invention, it is possible to prevent the cable from being melted or fired due to poor connection between the battery units or burn-out of the connection part when the battery is charged and discharged, There is an effect that it is possible to prevent it from occurring.

Further, according to the present invention, it is possible to accurately diagnose whether the cause of the error generated in the battery unit is caused by the battery or by the connection relationship between the battery units .

FIG. 1 is a block diagram schematically showing a network configuration to which an energy storage system according to an embodiment of the present invention is applied.
FIG. 2 is a block diagram schematically showing the configuration of the energy storage system shown in FIG. 1. FIG.
3 (a) to 3 (c) are diagrams showing the characteristics of the battery constituting the battery unit.
FIG. 4 is a graph schematically showing a configuration of a diagnostic apparatus of a battery control system included in the power management system shown in FIG. 2. FIG.
5 is a diagram illustrating impedance components of a battery module according to an embodiment of the present invention.
6 is a flowchart illustrating a method of diagnosing a battery conditioning system according to an embodiment of the present invention.

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a network configuration to which an energy storage system (ESS) according to an embodiment of the present invention is applied, and FIG. 2 is a block diagram illustrating a configuration of the energy storage system shown in FIG.

As shown in FIG. 1, an energy management system (EMS) 100 is connected to a plurality of energy storage systems 110. The energy management system 100 may include an operation schedule control of a plurality of energy storage systems 110, a reporting of various data transmitted from the plurality of energy storage systems 110, a power management of the plurality of energy storage systems 110, And predicts the demand and generation amount of the system (not shown).

In addition, the energy management system 100 performs functions such as power transaction history management or optimal power generation plan establishment.

The energy storage system 110 receives and recharges power generated from a renewable energy source such as wind power or solar power or the system 150 and discharges the power that was charged when a peak load or a grid fault occurs to the system, As shown in FIG.

1 and 2, the energy storage system 110 includes a battery conditioning system (BCS) 120, a power conditioning system (PCS) 130, and a power management system Management System: PMS, 140).

The battery control system 120 includes one or more battery units 121 to store power supplied from the renewable energy source or the system 150 in the battery unit 121. In case of a peak load or a system fault, And supplies power stored in the storage unit 121 to the system 150.

In one embodiment, the battery unit 121 may comprise any one of a battery rack group 122, a battery rack 124, and a battery module 126. The battery module 126 refers to a unit configured by a plurality of batteries 128 and the battery rack 124 refers to a unit including a plurality of battery modules 126. The battery rack group 122 includes a plurality of Means a unit composed of battery racks 124.

For example, the battery module 126 may be configured by connecting a plurality of batteries 128 in series or in parallel, and the battery rack 124 may be configured by connecting a plurality of battery modules 126 in series, The battery rack group 122 may be configured by connecting a plurality of battery racks 124 in parallel.

In one embodiment, the battery 128, which is the minimum unit constituting the battery unit 121, may be a secondary battery. According to this embodiment, the batteries 128 exhibit different types of impedance by passband, charge transfer, diffusion, and the like according to frequency bands, 3a, and the equivalent model as shown in Fig. 3a can be simplified as shown in Fig. 3b.

The simplified equivalent model shown in FIG. 3B is a resistance obtained by adding the internal resistance, the passivation resistance, and the charge transfer resistance of the battery 128 to the open circuit voltage Vocv (open circuit voltage: OCV) (Internal resistance) connected in series and Rd (Diffusion Resistance) due to diffusion phenomenon and Cd (Diffusion Capacitance) as a capacitor component are connected in parallel. Here, the charge transfer resistance represents the degree of disturbance of charge movement within the battery.

In the battery equivalent model shown in FIG. 3B, Ri denotes a total resistance connecting the electrode and the inside due to the resistance of the electrolyte, electrode, and terminal block. As shown in FIG. 3C, as the life of the battery 128 increases, Its size will increase.

Referring again to Figures 1 and 2, the power conditioning system 130 serves to associate the system 150 with the battery conditioning system 120. More specifically, the power conditioning system 130 charges the one or more battery units 121 included in the battery control system 120 or discharges the power stored in one or more battery units 121.

Hereinafter, the configuration of the power control system 130 according to an embodiment of the present invention will be described in more detail with reference to FIG.

2, the power regulation system 130 according to an embodiment of the present invention includes a switching gear 210, a transformer 220, and a plurality of power conversion units 230. The power conversion system 230 includes a plurality of power conversion units 230,

The switching gear 210 blocks the fault current from flowing into the system 150 or into the power regulation system 130 in the event of an accident.

The transformer 220 reduces the AC voltage of the system 150 to a predetermined value and supplies it to the power conversion unit 230 or boosts the AC voltage output from the power conversion unit 230 to a predetermined value, .

The plurality of power conversion units 230 convert the alternating current into direct current and provide it to the battery regulating system 120 or convert the direct current supplied from the battery regulating system 120 to alternating current and output it to the transformer 220. Although FIG. 2 illustrates that the power conditioning system 130 includes two power conversion units 230, this is only an example, and the power conditioning system 130 may include only one power conversion unit, Unit. ≪ / RTI >

In one embodiment, the power conversion unit 230 may be 1: 1 connected to the battery rack group 122 included in the battery conditioning system 120.

The power conversion unit 230 described above includes a breaker 232, a filter 234, an inverter 236, a smoothing capacitor 238, and a switch 239.

The circuit breaker 232 serves to prevent an overcurrent from flowing into the transformer 220 or the filter 234.

The filter 234 serves to reduce the harmonics of the reduced AC voltage through the transformer 220 or to reduce the harmonics of the AC voltage output from the inverter 236. In FIG. 2, this filter 234 is shown as being of the LCL type, but this is only an example and other configurations are possible.

The inverter 236 converts the AC voltage output from the filter 234 to a DC voltage or converts a DC voltage supplied from the battery control system 120 to an AC voltage.

The smoothing capacitor 238 performs a role of smoothing the DC voltage input from the battery control system 120 to the inverter 236 or the DC voltage output from the inverter 236. The voltage of the smoothing capacitor 238 must be pre-charged to prevent the inrush current from occurring when the battery regulating system 120 is connected to the power regulating system 130. If the smoothing capacitor 238 is not charged when the battery regulating system 120 is connected to the power regulating system 130, an inrush current may be generated and the device may be damaged or a fire may occur.

The switch 239 serves to electrically connect the battery control system 120 and the inverter 236.

Referring again to FIG. 1, the power management system 140 controls the operation of the battery conditioning system 120 and the power conditioning system 130, as shown in FIG. 1, Device 142 and a battery conditioning system diagnostic device 144. [

First, the controller 142 determines a charge / discharge command value in conjunction with the energy management system 100, and transmits the determined charge / discharge command value to the power control system 130 so that the power control system 130 can control the charge / Thereby allowing the battery control system 120 to be charged and discharged.

The battery control system diagnostic apparatus 144 diagnoses the state of the battery control system 120 by diagnosing the state of the battery unit 121 included in the battery control system 120. [ Hereinafter, such a configuration will be described in more detail with reference to FIG.

4 is a block diagram schematically illustrating the configuration of a battery control system diagnostic apparatus according to an embodiment of the present invention. 4, the battery control system diagnosis apparatus 144 according to an embodiment of the present invention includes a data receiving unit 410, a comparing unit 420, an impedance calculating unit 430, an error determining unit 440, And an analysis unit 450. The battery control system 400 according to an embodiment of the present invention may further include a database 460, as shown in FIG.

First, the data receiving unit 410 receives a current (hereinafter referred to as 'the current of the battery unit 121') output from the battery unit 121 from the battery control system 120 and a voltage (Hereinafter referred to as " voltage of the battery unit 121 "). The current of the battery unit 121 and the voltage of the battery unit 121 may be measured by the battery control system 120 and provided to the data receiving unit 410 at predetermined time points.

The data receiving unit 410 may receive status information of each battery 128 from the battery control system 120. The status information of the battery 128 may include information such as the temperature of the battery 128, the state of charge (SOC) of the battery 128, the output current of the battery 128, And whether the battery 128 is faulty or not.

The comparator 420 compares the first current, which is the current of the battery unit 121 measured at the present time, with the second current, which is the current of the battery unit 121 measured at a point in time (for example, immediately before) . The reason why the comparing unit 420 according to the present invention compares the first current with the second current is that the impedance of the battery unit 121 is different when the first current and the second current are different, The impedance of the battery unit 121 can be calculated only when the current flowing through the battery unit 121 changes.

The impedance calculator 430 may determine that the first current and the second current are different from each other by the comparing unit 420. The impedance calculator 430 may calculate a first current, a first voltage that is a voltage of the battery unit 121, And the second voltage, which is the voltage of the battery unit 121 measured at the previous time, to calculate the impedance of the battery unit 121. [

That is, the impedance calculating unit 430 calculates the impedance of the battery module 126 using the first current, the first voltage, the second current, and the second voltage output from the battery module 126, The first current, the first voltage, the second current, and the second voltage output from the battery rack 124 with respect to the battery rack 124 to calculate the impedance of the battery rack 126 at the present time, The first current, the first voltage, the second current, and the second voltage output from the battery rack group 122 to the battery rack group 122, And the impedance of the battery rack group 122 is calculated.

Assuming, for example, that the battery unit 121 is a battery module 126, the components of the impedance include the resistance of the cable connecting the batteries 128 constituting the battery module 126, A resistance of a connection terminal of the cable, a resistance of a coupling member (e.g., a bolt, a nut, etc.) fastened to the connection terminal of the cable, and an internal resistance of the battery 128.

In one embodiment, the impedance calculating unit 430 may calculate the impedance of the battery unit 121 using the following equation (1).

Figure 112015105817990-pat00001

In Equation 1, Zn represents the impedance of the battery unit 210 calculated at the n-th time point, In represents the current of the battery unit 121 measured at the n-th time point, Vn represents the battery unit current measured at the n- 1 represents the voltage of the battery unit 121 measured at the (n-1) th time point, Vn-1 represents the voltage of the battery unit 121 measured at the .

On the other hand, the impedance calculating unit 430 calculates the average impedance value of the battery unit 121 by averaging the impedances of the battery units 121. For example, when the battery unit 121 is the battery module 126, the impedance calculating unit 430 calculates the average impedance of the battery module 126 by averaging the impedances calculated for the respective battery modules 126. When the battery unit 121 is the battery rack 124, the impedance calculating unit 430 calculates the average impedance value of the battery rack 124 by averaging the impedances calculated for the respective battery racks 124. When the battery unit 121 is the battery rack group 122, the impedance calculating unit 430 calculates the average impedance value of the battery rack group 122 by averaging the impedances calculated for the respective battery rack groups 122.

The error determination unit 440 compares the impedance of each battery unit 121 calculated by the impedance calculation unit 430 with a predetermined impedance limit value to determine whether or not an error has occurred in the battery unit 121. [ At this time, the impedance limit value may be stored in the database 460 in advance.

In one embodiment, the error determination unit 440 may determine that an error has occurred in the battery unit 121 when the impedance of the battery unit 121 exceeds the impedance limit value.

On the other hand, when the impedance of the battery unit 121 calculated by the impedance calculating unit 430 exceeds the impedance limit value, the error determining unit 440 determines the impedance of the battery unit 121, And further determines whether or not an error has occurred in the corresponding battery unit 121. [

Specifically, the error determination unit 440 determines whether the impedance of the battery unit 121 calculated by the impedance calculation unit 430 is smaller than the average impedance value of the battery unit 121 (for example, larger than a predetermined value) (For example, smaller than a predetermined value), it can be determined that an error has occurred in the battery unit 121.

The analysis unit 450 determines whether or not an error has occurred in the battery unit 121 by the error determination unit 440. The analysis unit 450 analyzes the battery unit 121, (121). At this time, whether or not an error of the battery 128 has occurred can be received from the battery control system 120 through the data receiving unit 410.

In one embodiment, when it is determined that an error has occurred in both the battery unit 121 and the battery 120, the analyzer 450 determines that an error generated in the battery unit 121 is an error in the battery 128 itself As shown in FIG.

If it is determined that an error has occurred only in the battery unit 121 and no error has occurred in the battery 128, the analysis unit 450 may determine a connection relationship between the batteries 128 or a connection relationship between the battery units 121 It can be judged that an error has occurred.

In one embodiment, the analyzer 450 may provide information to the battery control system 120 by transmitting information about the failed battery unit 121 to the battery control system 120 when an error occurs in the battery unit 121, The operation of the battery unit 121 in which the error has occurred can be stopped.

The database 460 stores the status information of each battery 128 received via the data receiving unit 410 and the current / voltage of each battery unit 121. In addition, the database 460 stores a predetermined impedance limit value.

In one embodiment, the impedance limit value is obtained by measuring components such as the internal resistance of each battery unit 121, the cable resistance, the resistance of the cable connection terminal, and the resistance of the coupling member of the cable connection terminal in various situations, Is set to a critical resistance value expected to be generated.

As described above, according to the present invention, whether or not an error occurs in the connection relation of the batteries 128 and the connection relation between the battery units 121, based on the impedance of the battery unit 121, It is possible to quickly cope with the problem of the connection relationship between the batteries 128 and the connection relationship between the battery units 121, thereby reducing the maintenance cost and improving the safety of the battery control system 120 .

Although each energy storage system 100 is described as including a power management system 140 in FIG. 1, in a modified embodiment, a plurality of energy storage systems 100 share a single power management system 140 A single power management system 140 may control the operation of a plurality of battery conditioning systems 120 and a plurality of power conditioning systems 130 included in the plurality of energy storage systems 100. In such a case, the power management system 140 may be external to the energy storage system 100 or may be included only within a particular energy storage system 100.

Hereinafter, a diagnostic method of the battery control system according to an embodiment of the present invention will be described with reference to FIG.

6 is a flowchart illustrating a method of diagnosing a battery conditioning system according to an embodiment of the present invention. The diagnostic method of the battery control system shown in Fig. 6 can be performed by the power management system shown in Figs.

6, when the power management system 140 detects a current output from the battery unit 121 and a voltage output from the battery unit 121, (S600).

In one embodiment, the power management system 140 may receive state information of each battery 128 when receiving the current and voltage of the battery unit 121 from the battery conditioning system 120. [ The state information of the battery 128 may include at least one of a temperature of the battery 128, a charged amount of the battery 128, an output current of the battery 128, an output voltage of the battery 128, . ≪ / RTI >

Next, the power management system 140 determines whether or not the first current I N , which is the current of the battery unit 121 measured at the current point of time (point N ) It is determined whether or not the second current I N-1 , which is the current of the unit 121, is the same (S610). The reason why the power management system 140 according to the present invention compares the first current I N with the second current I N-1 is that the impedance of the battery unit 121 is smaller than the first current I It is possible to calculate the impedance Z N at the current time point of the battery unit 121 only when the current I N is different from the second current I N-1 , that is, when the current flowing through the battery unit 121 changes to be.

Next, when it is determined in S610 that the first current I N and the second current I N-1 are different, the power management system 140 determines the first current I N , Which is the voltage of the battery unit 121 measured at the previous point in time N-1, and the first voltage V N , the second current I N-1 , which are the voltages of the battery unit 121, V N-1 ) to calculate the impedance Z N at the current point of time of the battery unit 121 (S620).

For example, the power management system 140 may control the battery module 126 such that the first current I N , the first voltage V N , the second current I N-1 output from the battery module 120, The impedance Z N of the battery module 120 at the present time is calculated using the first voltage V N-1 and the second voltage V N-1 , or the impedance Z N of the battery module 120 is calculated with respect to the battery rack 124, The impedance of the battery rack 124 at the current point in time is calculated using the first current I N , the first voltage V N , the second current I N-1 , and the second voltage V N- (Z N) calculated, or the first current (I N) is for a battery rack group 122, the output from the battery rack group 122, the first voltage a (V N), a second current (I N-1 ) And the second voltage (V N-1 ) are used to calculate the impedance Z N of the battery rack group 122 at the present time.

At this time, the components of the impedance are the resistance of the cable connecting the batteries 128 constituting the battery unit 121, the resistance of the connection terminal of the cable, the resistance of the coupling member fastened to the connection terminal of the cable, ), ≪ / RTI >

In one embodiment, the power management system 140 may calculate the impedance Z N at the current point of time of the battery unit 121 using Equation 1 described above.

Meanwhile, the power management system 140 may calculate the impedance average value Zavg obtained by averaging the impedances of the battery units 121 at the time of calculating the impedance Z N of each battery unit 121.

For example, when the battery unit 121 is the battery module 126, the power management system 140 calculates the average impedance value of the battery module 126 by averaging the impedances calculated for the respective battery modules 126, The average impedance of the battery rack 124 is calculated by averaging the impedances calculated for the respective battery racks 124 in the case where the battery packs 121 and 121 are battery racks 124, The average impedance of the battery rack group 122 is calculated by averaging the impedances calculated for each of the battery rack groups 122.

Next, the power management system 140 compares the impedance Z N of each battery unit 121 at the present time calculated at S620 with a predetermined impedance limit value Z lim to determine whether the battery unit 121 has failed (S630).

At this time, the impedance limit value Z lim is measured in various situations such as the internal resistance of each battery unit 121, the cable resistance, the resistance of the cable connection terminal, and the resistance of the coupling member of the cable connection terminal, Is set to the threshold resistance value expected to be generated.

If it is determined in S630 that the impedance Z N of the battery unit 121 exceeds the impedance limit value Z lim , the power management system 140 determines that an error has occurred in the corresponding battery unit 121 (S640 ).

On the other hand, if it is determined in step S630 that the impedance Z N of the battery unit 121 exceeds the impedance limit value Z lim , the power management system 140 sets the impedance of the calculated battery unit 121 to Z N (S650) whether the error of the battery unit 121 has occurred or not by comparing the average value Zavg of the battery unit 121 with the impedance average value Zavg.

The power management system 140 determines that the impedance Z N of the battery unit 121 is smaller than the impedance average value Zavg of the battery unit 121 (for example, larger than a predetermined value) It is determined that an error has occurred in the battery unit 121 (S640).

If it is determined that an error has occurred in the battery unit 121, the power management system 140 further determines whether an error has occurred in the battery 128 constituting the battery unit 121 (S660). If it is determined that a battery 120 error has occurred, the power management system 140 determines that an error occurred in the battery unit 121 is caused by an error of the battery 128 itself (S670).

If it is determined in S660 that no error has occurred in the battery 128, the power management system 140 determines that an error has occurred in the connection relationship between the batteries 128 or in the connection relationship between the battery units 121 (S680).

If the impedance Z N of the battery unit 121 is not greater than or equal to the impedance average value Zavg of the battery unit 121 by a predetermined value or more as a result of the determination in S650, To S680 are repeatedly performed.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Energy management system 110: Energy storage system
120: Battery control system 121: Battery unit
130: power regulation system 140: power management system
410: Data receiving unit 420:
430: Impedance calculation unit 440:
450: Analysis section 460: Database

Claims (15)

A battery control system diagnostic apparatus for diagnosing a battery control system including a plurality of batteries,
A battery pack comprising a plurality of batteries connected in series or in parallel, a battery rack in which a plurality of battery modules are connected in series, and a plurality of battery rack groups connected in parallel, A comparing unit comparing a current and a second current at a second time point that is earlier than the first time point;
The first current and the second current at the first point of time of the battery unit and the second current at the first point of time and the second current of the battery unit at the second point of time of the battery unit are determined by the comparing unit when the first current and the second current are different, An impedance calculating unit for calculating an impedance at a first time point of the battery unit using a second voltage at the first point of time; And
An impedance at the first time point calculated by the impedance calculating unit is compared with a preset impedance limit value to determine an error of the battery unit and a comparison is made between the impedance at the first time point and the impedance average value of the battery unit An error determination unit for determining an error of the battery unit;
A data receiving unit for receiving information on whether or not an error has occurred in the battery from the battery control system; And
If it is determined that an error has occurred in both the battery unit and the battery, it is determined that the error of the battery unit is caused by an error of the battery, and an error is generated in the battery unit, And if it is determined that an error has occurred in the connection relationship of the batteries or the connection relation of the battery units. The method according to claim 1,
Wherein the first current and the second current are output currents of at least one of the battery module, the battery rack, and the battery rack group, and wherein the first voltage and the second voltage are the output currents of the battery module, the battery rack, And the output voltage of at least one of the rack groups. The method according to claim 1,
The impedance calculator calculates,
Equation
Figure 112015105817990-pat00002
To calculate the impedance at the first time point,
In is the impedance at the n-th time point of the battery unit, In is the current at the n-th time point of the battery unit, Vn is the voltage at the n-th time point of the battery unit, 1 < th > time point of the battery unit, and Vn-1 represents a voltage at the (n-1) th point of time of the battery unit. The method according to claim 1,
Wherein the data receiving unit receives the current and voltage for each point of time of the battery unit from the battery control system. delete The method according to claim 1,
And the impedance calculation unit calculates an average impedance value of the battery unit. A battery control system including a battery module in which a plurality of batteries are connected in series or in parallel, a battery rack in which a plurality of battery modules are connected in series, and one or more battery units in which a plurality of battery rack groups are connected in parallel, Conditioning System: BCS);
A power conditioning system (PCS) for charging or discharging the battery unit according to a charge / discharge command value; And
And a power management system (PMS) for determining the charge / discharge command value and controlling operations of the battery control system and the power control system according to the charge / discharge command value,
The power management system comprising:
Wherein the impedance of the battery unit is determined by comparing an impedance at a first time point of the battery unit with a predetermined impedance limit value to determine an error of the battery unit and further comparing an impedance at the first time point with an impedance average value of the battery unit, An error determination unit for determining an error;
A data receiving unit for receiving information on whether or not an error has occurred in the battery from the battery control system; And
If it is determined that an error has occurred in both the battery unit and the battery, it is determined that the error of the battery unit is caused by an error of the battery, and an error is generated in the battery unit, And determining that an error has occurred in the connection relationship of the batteries or in the connection relation of the battery units when the determination result is YES. delete 8. The method of claim 7,
Wherein the impedance of the battery unit is at least one of an impedance of the battery module, an impedance of the battery rack, and an impedance of the battery rack group. 8. The method of claim 7,
Wherein the impedance component of the battery unit includes at least one of a cable resistance, a connection terminal resistance of the cable, and a resistance by a coupling member fastened to a connection terminal of the cable. 8. The method of claim 7,
The power management system comprising:
Equation
Figure 112017015940179-pat00003
Further comprising an impedance calculating unit for calculating an impedance at the first time point of the battery unit using the impedance calculating unit,
In is the impedance at the n-th time point of the battery unit, In is the current at the n-th time point of the battery unit, Vn is the voltage at the n-th time point of the battery unit, 1 represents the current at the (n-1) th time point of the battery unit, Vn-1 represents the voltage at the (n-1)
The current at the nth and n-1th time points is the output current of at least one of the battery module, the battery rack, and the battery rack group, and the voltage at the nth and n- An output voltage of at least one of the battery rack, the battery rack, and the battery rack group. delete delete 8. The method of claim 7,
The power management system comprising:
Further comprising an impedance calculating unit for calculating an impedance at a first time point of the battery unit and an average value of impedances of the battery units. 8. The method of claim 7,
The power management system comprising:
A comparing unit comparing a first current at a first point of time of the battery unit and a second current at a second point of time before the first point of time; And
Wherein when the first current and the second current are different from each other, the first and second currents and the first voltage at the first point of time of the battery unit and the second voltage at the second point of time, And an impedance calculating section for calculating an impedance at a point in time when the voltage is applied to the first electrode.
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