KR101799564B1 - Energy storage system - Google Patents

Abstract

The present invention relates to a battery pack including a plurality of battery racks, a plurality of racks BMS provided respectively in the plurality of battery racks, and at least one bank BMS connected to the plurality of racks BMS, And outputs a power storage device that calculates the average and deviation and outputs it to the manager.

Description

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage device, and more particularly, to a power storage device having a battery management system that calculates a state of a battery and transmits the calculated state to an administrator.

Environmental destruction, and resource depletion are serious problems, there is a growing interest in power storage devices capable of storing energy and efficiently utilizing stored energy. The power storage device includes a plurality of battery packs connected in series or in parallel to maintain a driving voltage and efficiently output energy, and a plurality of battery racks connected in series to form a plurality of battery packs Thereby constituting a battery. In addition, the power storage device includes a battery management system (hereinafter referred to as BMS) that manages the charging and discharging of the battery, a power management system that converts DC power discharged from the battery into DC power of different levels or power conversion (Power Conversion System).

On the other hand, the BMS may include a plurality of rack BMSs each managing a plurality of battery racks, and at least one bank BMS managing a plurality of racks BMSs. The plurality of racks BMS detects the voltage and current of each battery rack, and the bank BMS monitors data such as voltage and current supplied from the rack BMS to manage charge and discharge of the entire battery. That is, the bank BMS estimates the state of charge (SOC) and the lifetime (State of Health: SOH) of each battery rack using the voltage and current of the battery rack, And manages charging and discharging of each battery rack.

Further, the data output from the plurality of rack BMSs and the bank BMS is transmitted to the manager. The manager converts the data output from the plurality of rack BMSs and the bank BMS into the form of, for example, an excel or the like as needed and processes the data. For example, the serial numbers of a plurality of battery racks can be aligned in the row direction, and the voltage, current, SOC, and SOH of each battery rack can be arranged in the column direction and processed in the form of a table. In addition, the administrator calculates the average and deviation of the voltage, current, SOC, and SOH of a plurality of battery racks, and used the control of the battery through the bank BMS. However, such a conventional data processing method requires a large amount of processing time because the manager must directly process the data, thereby reducing the efficiency of business and data loss during data processing.

Korean Patent No. 10-1147202 Korean Patent Publication No. 2014-0003201

The present invention provides a power storage device that processes data output from a plurality of rack BMSs in a bank BMS and outputs the processed data to an administrator.

The present invention provides a power storage device that processes data output from a plurality of rack BMSs in a form required by an administrator and transmits the processed data to an administrator.

According to an aspect of the present invention, a power storage device includes: a plurality of battery racks; A plurality of rack BMSs respectively provided in the plurality of battery racks; And at least one bank BMS connected to the plurality of rack BMSs. The bank BMS receives state data of the plurality of battery racks, calculates an average and a deviation of the input state data, and outputs the calculated average and deviation to the management system.

The bank BMS includes an input / output unit for inputting / outputting data to / from the plurality of rack BMSs and an administrator, SOH and SOC using state data including voltage, current, and resistance of the plurality of battery racks, A controller for calculating an average and a deviation, respectively; And a data storage unit for storing state data, estimated data of the plurality of battery racks, and an average and an error thereof.

The data storage unit stores reference data including a reference voltage of the battery rack, a reference current, and a reference temperature.

The bank BMS generates a control signal for controlling at least one battery rack whose deviation of the state data and the estimated data is out of an error range and delivers the control signal to the plurality of rack BMSs.

The control unit includes an SOH estimating unit for estimating an SOH of the battery rack, an SOC estimating unit estimating an SOC of the battery rack, and a calculating unit calculating an average and a deviation of the state data of the battery rack and the SOH and the SOC, And a processor for storing the state data, the estimated SOH, and the SOC in the data storage unit and outputting the data to the manager.

The processor divides the state data, the SOH and the SOC for each of a plurality of battery racks, and the average and deviation of the state data, and transmits the state data, SOH, and SOC to the manager system through the input / output unit in a form including a table, a graph and a graphic.

According to another aspect of the present invention, there is provided a method of driving a power storage device, including: sensing state data of a battery rack including voltage, current, and temperature of each of a plurality of battery racks; Estimating SOH and SOC of the battery rack using the state data of the battery rack, calculating state data and an average and deviation of the estimated SOH and SOC; Storing the state data and the estimated data of the battery rack and the average and deviation of each of the state data and the estimated data in a data storage unit and delivering the data to the manager.

Wherein the step of storing the average and the deviation of the state data and the estimated data of the battery rack in the data storage unit and delivering the state data and the estimated data to the manager includes dividing the average and the deviation of the state data and the estimated data for each of the plurality of battery racks, And transmits them to the management system in a form including a graph and a graphic.

The bank BMS further includes generating a control signal for controlling at least one battery rack whose deviation of the state data and the estimated data is out of an error range and delivering the control signal to the rack BMS of the corresponding battery rack.

Embodiments of the present invention estimate SOH, SOC, and the like using state data such as voltage and current of a plurality of battery racks in the bank BMS, calculate an average and a deviation of the SOH and SOC, and transmit the average and deviation to the manager, i.e., the management system . At this time, data is arranged for each of a plurality of battery racks and displayed to the manager in the form of a table, a graph, and a figure.

According to the present invention, the data is processed in the bank BMS and then transmitted to the manager, so that the efficiency of the processing can be improved and the data loss can be prevented as compared with the case where the conventional manager directly processes the data.

1 is a configuration diagram of a power storage system to which the present invention is applied;
2 is a configuration diagram of a power storage device according to an embodiment of the present invention;
3 is a configuration diagram of a rack BMS according to an embodiment of the present invention;
4 is a configuration diagram of a bank BMS according to an embodiment of the present invention;
5 is a flowchart illustrating a method of driving a power storage device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely.

1. Configuration Example of Power Storage System

1 is a block diagram illustrating a configuration of a power storage system to which the present invention is applied.

Referring to FIG. 1, a power storage system may include a power management system 100 and a power storage 200. The power storage system may be connected to the power generation system (not shown) and the load 300. The power generation system may include a system for generating electric energy using renewable energy such as solar light, wind power, wave power, and assist power. In addition, the power generation system may include a power plant that generates power through thermal power, hydro power, nuclear power, etc., a substation or a power station that converts the voltage or current of the generated power. Hereinafter, a power generation system using renewable energy will be referred to as a first power generation system, and a power generation system such as a power plant will be referred to as a second power generation system. The load 300 may include various electric driving devices and the like that consume electric power. For example, it may include household appliances or production facilities of factories.

The power management system 100 is a system that links power systems such as the power of the power generation system and the power of the power storage device 200. The power management system 100 may use the power storage device 200 to manage the temporal inconsistency of the production and consumption of the power system. The power management system 100 may include at least one power conversion device, at least one switch, and a control unit. For example, the power management system 100 may include a first power conversion device 110, a second power conversion device 120, a third power conversion device 130, a first switching device 140, A controller 150, a DC link device 160, and a main controller 170.

The first power conversion apparatus 110 is connected to the first power generation system and converts the first power generated in the first power generation system into second power and transmits the second power to the first node N1. The first power generated in the first power generation system may be DC power or AC power, and the second power of the first node N1 is DC power. That is, the first power inverter 110 may convert the first power of the direct current into the second power of the different magnitude, or may convert the first power of the alternating current into the second power of the direct current.

The DC link device 160 is connected to the first node N1 and maintains the voltage level of the first node N1 at a constant DC link voltage level. The DC link device 160 can prevent the voltage level of the first node N1 from becoming unstable due to variations in the output voltage of the first power generation system, 3 power converter 130 to operate normally. The DC link device 160 may include a capacitor for a DC link connected in parallel between the first node N1 and the second power conversion device 120. [

The second power inverter 120 is connected between the first node N1 and the second node N2 and the load 300 is connected to the second node N2. The second power converter 120 converts the DC power of the first node N1 into AC power and transmits the AC power to the second node N2. The second power inverter 120 converts the AC power of the second node N2 to DC power and transmits the DC power to the first node N1. That is, the second power inverter 120 can convert the power between the DC power of the first node N1 and the AC power of the second node N2 in both directions. AC power for supplying the load 300 is formed at the second node N2.

The third power conversion device 130 is connected between the first node N1 and the power storage device 200. [ The third power conversion device 130 converts the second power of the direct current of the first node N1 into the third power of direct current for storing the power storage device 200 and transfers the third power to the power storage device 200. [ The third power converter 130 converts the third power of the direct current of the power storage device 200 into the second power of direct current and transmits it to the first node N1. That is, the third power inverter 130 may perform the function of a bidirectional converter for converting the DC power of the first node N1 and the DC power of the power storage device 200 in both directions.

The first switching device 140 is connected between the second power conversion device 120 and the second node N2 and blocks power flow between the second power conversion device 120 and the second node N2 . The second switching device 150 is connected between the second node N2 and the second power generation system (not shown), and blocks the power flow between the second node N2 and the second power generation system. As the first switching device 140 and the second switching device 150, an apparatus including a field effect transistor, a bipolar junction transistor, or the like may be used. In particular, the second switching device 150 blocks the connection with the second power generation system and implements the independent operation of the power storage system when an abnormal situation occurs in the second power generation system.

The main control device 170 controls the overall operation of the power management system 100. The main controller 170 receives power information (sensing signals of voltage, current, and temperature) generated in the first power generation system from the first power conversion apparatus 110 and receives SOCs from the BMS of the power storage apparatus 200, SOH, and the like. The main controller 170 controls the operation mode of the power management system 100 based on the power information generated by the first power generation system and the power storage information of the power storage device 200. The main control unit 170 receives sensing signals of voltage, current, and temperature from the first power conversion unit 110, the second power conversion unit 120, and the third power conversion unit 130, The power conversion efficiency of each of the power conversion units 110, 120, and 130 is controlled according to the operation mode of the system 100. The main control device 170 controls on / off of the first switching device 140 and the second switching device 150 in accordance with the operation mode of the power management system 100. For example, in the case of the charging mode in which the load 300 is charged, at least one of the first and second switching devices 140 and 150 is turned on to charge the load 300.

The power storage device 200 may include a battery cell capable of charging and discharging. The power storage device 200 may include a plurality of battery packs in which a plurality of battery cells are connected in series or in parallel and may include a plurality of battery racks in which a plurality of battery packs are connected in series. have. A plurality of battery racks may be connected in parallel. Meanwhile, a battery management system (BMS) for controlling charging and discharging of the battery may be included in the power storage device 200 or the power management system 100. The BMS detects the voltage, current, and temperature of each cell in the battery pack and monitors the state of charge (SOC) and the state of health (SOH) of each cell to detect overcharge, overdischarge , Protects the cells from overcurrent, overheating, etc. and improves battery efficiency through cell balancing.

2. Configuration example of power storage device

2 is a block diagram illustrating a configuration of a power storage device according to an embodiment of the present invention.

Referring to FIG. 2, a power storage device according to an embodiment of the present invention includes a battery including a plurality of battery racks 210, a bank BMS 220, a bus bar 230, a power conversion unit 230, PCS) < / RTI >

Each of the plurality of battery racks 210a to 210n includes a plurality of battery cells connected in series, parallel or series-parallel, and a plurality of rack BMSs 211a to 211n (211) for managing charge and discharge of the battery rack, respectively can do. Here, a plurality of battery cells constitute one battery pack, a plurality of battery packs may constitute one battery rack 210, and a pack BMS may be provided to each battery pack. The plurality of rack BMSs 211 measure the charging / discharging information, voltage, and current of each battery rack 210 and transmit them to the bank BMS 220.

The bank BMS 220 manages a plurality of rack BMSs 211 to manage charging and discharging of the entire battery. For example, the bank BMS 220 estimates the SOC and the SOH using the voltage and current data of each of the plurality of battery racks 210 received from the plurality of rack BMSs 211, The average and deviation of the voltage, current, SOC, SOH, The data thus calculated by the bank BMS 220 can be transmitted to the manager, that is, the management system, and can be used for management of the rack BMS 211. Of course, the data calculated from the bank BMS 220 may be transmitted to the main controller 170, for example, and then to the manager. Here, the bank BMS 220 can convert the data in a form required by the administrator and deliver it to the manager. For example, a plurality of battery racks may be arranged in the row direction according to the serial number, and the voltage, current, SOC, and SOH of the battery rack may be transmitted to the manager in the form of a table arranged in the column direction have. Of course, the data of each battery rack can be transmitted to the manager in the form of a relative comparison graph. Meanwhile, the plurality of rack BMSs 211 and the bank BMSs 220 may be connected by CAN (Controller Area Network) communication.

The bus bar 230 connects the power conversion unit 240 and the plurality of battery racks 210. The bus bar 230 includes main power lines 231 and 232 connected to the power conversion unit 240 and a plurality of sub power lines 231 a and 232 b connecting the plurality of battery racks 210 to the main power lines 231 and 232 in parallel. , 232a, 231b, 232b, ..., 231n, 232n. One end of the plurality of first sub-power lines 231a, 231b, ..., 231n is connected to the first electrode terminal (+) of each battery rack 210 and the other end is connected to the first main power line 231. One end of each of the plurality of second sub-power lines 232a to 232n is connected to a second electrode terminal (-) of each battery rack 210 and the other end is connected to a second main power line 232 . That is, the plurality of battery racks 210 are connected to the main power lines 231 and 232 in parallel. Accordingly, the power conversion unit 240 and the plurality of battery racks 210 are connected through the bus bar 230 to transmit the current.

The power conversion unit 240 converts the DC power discharged from the plurality of battery racks 210 into DC power of a different level or AC power. The power conversion unit 240 converts DC power or AC power applied from the outside into DC power for charging the plurality of battery racks 210. [ The power conversion unit 240 may be grounded, and the power conversion unit 240 is commonly grounded with the plurality of battery racks 210. [ Meanwhile, the power conversion unit 240 can control power conversion through switching using an IGBT (Insulated Gate Bipolar Transistor).

3. Rack BMS Configuration Example

3 is a configuration diagram of a rack BMS according to an embodiment of the present invention.

3, the rack BMS 211 includes a first power supply unit 311 for supplying power, a sensing unit 312 for sensing the state of the battery rack 210, a first input / output Unit 313 and a first control unit 314 for controlling and managing the rack BMS 211. [ In addition, the battery pack 200 may further include a balancing unit 315 that performs balancing of the battery rack 210.

The first power supply unit 311 supplies power to the components of the rack BMS 211. That is, the first power supply unit 312 generates power for driving the sensing unit 312, the first input / output unit 313, the first control unit 314, and the balancing unit 315 constituting the rack BMS 211 . At this time, at least one of the components constituting the rack BMS 211 may have different driving power. The first power supply unit 311 generates at least one power source for driving each component in the rack BMS 211 To each component. The first power source unit 311 may generate at least one power source for driving the rack BMS 211 using the battery rack 210 or a separate auxiliary battery.

The sensing unit 312 is provided for sensing the state of the battery rack 210, for example, sensing the voltage, current, and the like of the battery rack 210. Here, the sensing unit 312 can sense not only the battery rack but also the voltage and current of at least one of the battery pack and the battery cell. That is, the sensing unit 312 can sense voltage, current, etc. of at least one of the battery rack, the battery pack, and the battery cell. For this, the sensing unit 312 may include a plurality of sensors, for example, at least one voltage sensor and at least one current sensor. The voltage sensor can measure the voltage of at least one of the battery rack, the battery pack or the battery cell. For example, a voltage sensor can be used to measure the voltage of a battery rack, which can measure a stabilized voltage, or OCV (Open Circuit Voltage), after a predetermined time from the battery rack. The current sensor can also measure the current in the battery rack. The current sensor may include a Hall current transformer (Hall CT) that measures current using, for example, a Hall element and outputs a signal corresponding to the measured current. Meanwhile, the sensing unit 312 may further include a battery rack or a temperature sensor (not shown) for measuring the ambient temperature. The temperature sensor can measure the temperature of one area or a plurality of areas of the battery rack or the battery pack, and at least one temperature sensor can be provided for this purpose.

The first input / output unit 313 performs data input / output between the rack BMS 211 and the bank BMS 220. At this time, a CAN (Controller Area Network) communication is established between the rack BMS 211 and the bank BMS 220 to perform data input / output. The first input / output unit 313 receives data output from the first control unit 314 and transfers the data to the bank BMS 220. The first input / output unit 313 receives data or control signals transmitted from the bank BMS 220, (314). In the first input / output unit 313, a buffer unit (not shown) for temporarily storing data may be provided. That is, the buffer unit temporarily stores the data output from the bank BMS 220 and input to the first input / output unit 313, and then transmits the data to the first control unit 314, 312 and the like to temporarily store the data and transmit the data to the bank BMS 220.

The first control unit 314 controls and manages the components constituting the rack BMS 211. That is, the first control unit 314 controls the sensing unit 312 to allow the sensing unit 312 to sense voltage, current, temperature, etc. of at least one of the battery rack, the battery pack, and the battery cell, Output unit 313 to the bank BMS 220. The bank I / Here, the sensing unit 312 continuously senses the state of the battery rack 210, and the first control unit 314 may periodically transmit the data output from the sensing unit 312 to the bank BMS 220 . Of course, the first controller 314 may compare the previous data sensed by the sensing unit 312 with the current data, and may transmit the data to the bank BMS 220 only when the current data is changed or changed outside the set range . Also, the first controller 314 controls the balancing unit 315 to balance at least any one selected battery cell.

The balancing unit 315 may charge or discharge the entire plurality of battery cells constituting the battery rack 210 to balance the full state of charge of the plurality of battery racks 210 under the control of the bank BMS 220 have. That is, the plurality of battery racks 210 may have a high or low charging status. In this case, the bank BMS 220 supplies a control signal to the rack BMS 211 of the corresponding battery rack 210, Balancing is performed through the balancing unit 315 under the control of the first control unit 314 of the BMS 211 to charge or discharge the entire battery cells constituting the battery rack. At this time, the battery rack 210 having a relatively high charging state discharges all the battery cells, and the battery rack 210 having a relatively low charging state can charge the entire battery cells. The balancing unit 315 may be configured such that, for example, a switch and a load resistance are connected in series between both ends of each battery cell. Accordingly, the switch is turned on and off according to the control signal of the first control unit 314, thereby discharging the voltage charged in the battery cell through the load resistor. The balancing unit 315 controls the balancing unit 315 to discharge the cells having a relatively high charge state in order to balance the charge states of the battery cells constituting the battery rack 210 under the control of the first control unit 314, Low cells can be charged. That is, the sensing unit 312 senses the voltages and currents of the plurality of battery cells constituting the battery rack 210, and the first control unit 313 senses the battery cells 210, The cell can be charged and discharged with low charge.

4. Bank BMS Configuration Example

4 is a block diagram of a bank BMS according to an embodiment of the present invention.

4, a bank BMS 220 according to an exemplary embodiment of the present invention includes a second power supply unit 410 for supplying power, a second control unit 420 for controlling the bank BMS, A second input / output unit 430 for inputting and outputting data, and a data storage unit 440 for storing data. The second control unit 420 may include an SOH estimation unit 421, an SOC estimation unit 422, an operation unit 423, and a processing unit 424.

The second power supply unit 410 is provided in the bank BMS 220 and supplies power to the components constituting the bank BMS 220. The second power source unit 410 may generate power using a separate auxiliary battery. At least one of the second control unit 420, the second input / output unit 430 and the data storage unit 440 constituting the bank BMS 220 may have different driving power. At least one power source for driving each component in the bank BMS 220 can be generated.

The second control unit 420 manages a plurality of rack BMSs 211 to manage charging and discharging of the entire battery. That is, the second control unit 420 receives the data of the plurality of rack BMSs 211 through the second input / output unit 430 to estimate SOH, SOC, etc., calculates the deviation of voltage, current, And generates a control signal for controlling the rack BMS 211 and outputs the control signal through the second input / output unit 430. For example, the second control unit 420 receives data such as voltage and current of a plurality of battery racks 210 input from the plurality of rack BMSs 211, SOH, SOC, and the like, and can calculate voltage deviation, current deviation, and the like of each battery rack 210. The second control unit 420 may store data such as SOH, SOC, voltage deviation, and current deviation of each battery rack 210 in the data storage unit 440 and output the data to the manager. At this time, the second control unit 420 can convert the data in a form required by the administrator and deliver it to the manager. For example, a plurality of battery racks may be arranged in the row direction according to the serial number, and the voltage, current, SOC, and SOH of the battery rack may be transmitted to the manager in the form of a table arranged in the column direction The data of each battery rack 210 may be transmitted to the manager in the form of a relative comparison. The second control unit 420 may generate and output control signals for managing charging and discharging of at least one battery rack 210 using the data of the plurality of battery racks 210. [ For example, a control signal for balancing at least one battery rack 210 that deviates from an error range such as a current deviation, a voltage deviation, and the like is generated and output to the rack BMS (211). The second control unit may include an SOH estimation unit 421, an SOC estimation unit 422, an operation unit 423, and a processing unit 424, and the configuration thereof will be described later.

The second input / output unit 430 is provided for inputting / outputting data between the bank BMS 220 and the rack BMS 211, and between the bank BMS 220 and the administrator. That is, the second input / output unit 430 receives the control signal output from the second control unit 420 and transfers the control signal to the plurality of rack BMSs 211, and inputs data transmitted from the plurality of racks BMSs 211, 2 control unit 420, as shown in FIG. In addition, the second input / output unit 430 can transmit the data calculated by the second control unit 420 to the manager. In addition, a buffer unit (not shown) for temporarily storing data may be provided in the second input / output unit 430. That is, the buffer unit temporarily stores the control signal output from the second control unit 420 and can transmit the control signals to the plurality of rack BMSs 211, respectively, and temporarily stores a plurality of pieces of data supplied from the plurality of racks BMSs 211 And then supplied to the second control unit 420. That is, the buffer unit may temporarily store data input from the plurality of rack BMSs 211 to the second input / output unit 430, and then transmit the data to the second control unit 420 in order of input.

The data storage unit 440 may store various data for battery operation and data of a plurality of battery racks 210. For example, the data storage unit 440 may store a reference voltage, a reference current, a reference temperature, a reference SOH, a reference SOC and corresponding error ranges of the battery rack 210 for battery operation. The data storage unit 440 may store status data of a plurality of battery racks 210 transmitted from the rack BMS 211 and may store a plurality of battery racks 210 calculated by the second control unit 420, Each SOH, SOC, etc. can be stored. At this time, the data of the battery rack 210 may be stored in the data storage unit 440 separately for each battery rack 210. For example, a plurality of battery racks in the row direction may be arranged in serial number order, and the voltage, current, SOH, SOC, and average and deviation of each battery rack in the column direction may be arranged. The data storage unit 440 may be a hard disk drive, a flash memory, an electrically erasable programmable read-only memory (EEPROM), a static random access memory (SRAM), a ferro-electric random access memory (FRAM) Magnetic RAM) or the like can be used.

5. Bank BMS Of the second control unit

4, the second control unit 420 of the bank BMS 220 according to an embodiment of the present invention includes an SOH estimation unit 421, an SOC estimation unit 422, an operation unit 423, 424).

The SOH estimating unit 421 estimates the capacities of the plurality of battery racks 210 in order to predict the degradation degree of the battery. Here, the capacity estimation of the battery rack 210 can be performed in various ways. For example, since the capacity of the battery rack 210 can be estimated by changing the internal resistance of the battery rack 210, the current and voltage received from the plurality of battery racks 210 can be applied to the Ohm's law, ) Can be indirectly calculated. The SOHs of the plurality of battery racks 210 estimated by the SOH estimation unit 421 are stored in the data storage unit 440. At this time, the processing unit 424 may be used to store the SOH. That is, the processing unit 424 can store the SOH of each battery rack 210 estimated by the SOH estimation unit 421 for each battery rack 210 of the data storage unit 440.

The SOC estimating unit 422 estimates the SOC of the plurality of battery racks 210 by using the estimated capacity of the battery rack 210 and the current of the battery rack 210 from the SOH estimating unit 421, The SOC of the battery rack 210 is estimated. That is, the SOC estimating unit 422 accumulates the current value measured for the predetermined time measured from the sensing unit 312 of the rack BMS 211 and divides the current value by the estimated battery capacity (Capacity) from the SOH estimating unit 421 The SOC of the battery rack 210 can be estimated. The SOC of the plurality of battery racks 210 estimated by the SOC estimating unit 422 is stored in the data storing unit 440 by the processing unit 424. [ That is, the processing unit 424 can store the SOC of each battery rack 210 estimated by the SOC estimating unit 422 in the data storage unit 440 for each battery rack 210.

The calculating unit 423 calculates the average and deviation of the current, voltage, etc. of each battery rack using data such as the current and voltage measured from the battery rack 210. The arithmetic unit also calculates the average and deviation of SOH and SOC of each of the plurality of battery racks 210 estimated by the SOH estimating unit 421 and the SOC estimating unit 422. [ That is, the calculating unit 423 calculates an average, a deviation, and the like of each state data of the plurality of battery racks 210. The data computed by the computation unit 423 may be stored in the data storage unit 440 by the processing unit 424. [ That is, the processing unit 424 stores data such as an average and a deviation of voltage, current, SOH, and SOC of each battery rack 210 calculated by the calculating unit 423 in the battery storage unit 440, You can save as many.

The processing unit 424 manages data between the second input / output unit 430 and the second control unit 420, and between the second control unit 420 and the data storage unit 440. That is, the processing unit 424 provides the SOH estimation unit 421, the SOC estimation unit 422, and the operation unit 423 with data transmitted from the plurality of rack BMSs 211 to the second input / output unit 430, And stores the data in the data storage unit 440. The processing section 421 can also provide the arithmetic section 423 with the data estimated by the SOH estimating section 421 and the SOC estimating section 422. [ The processing unit 424 can also determine whether the result calculated by the computing unit 423 is within an error range. That is, state data such as voltage, current, SOH, and SOC of the plurality of battery racks 210 may be calculated by the calculating unit 423 to have a predetermined deviation. The processing unit 424 includes a plurality of battery racks 210, Whether or not the deviation of the state data of the terminal is included in the error range or not. The processing unit 424 generates a control signal for controlling the rack BMS 211 of the battery rack 210 when the deviation of the battery rack 210 is out of the error range, To the BMS 211. For example, a control signal for balancing the battery rack 211 whose average or deviation of voltage or current deviates from the error range is generated and output. The processor 424 divides the voltage, current, SOH, and SOC of each of the battery racks 210 and the average and deviation of the battery racks 210 by battery rack 210 and processes them by a table or a graph, (430). ≪ / RTI > For example, the processing unit 424 may store the voltage, current, SOH, and SOC of each battery rack 210 divided and stored for each battery rack 210 in the data storage unit 440, Graphs, etc., and transmit them to the manager.

6. Example of driving method

A method of driving the power storage device according to an embodiment of the present invention will now be described with reference to FIG.

The rack BMS 211 provided in each of the plurality of battery racks 210 senses the voltage and current of each battery rack 210 using the sensing unit 312 (S110). Also, the sensing unit 311 can sense the temperature of the battery rack 210 and the ambient temperature. Meanwhile, the rack BMS 211 may perform balancing of at least one of the plurality of battery cells constituting the battery rack 210. [ That is, when the sensing unit 312 senses the voltage and current of the battery cell, balancing is performed using the balancing unit 315 for battery cells that are higher or lower than the average voltage of the battery cells constituting the battery rack 210 can do. At this time, the battery cells higher than the average voltage are discharged, and the battery cells lower than the average voltage are charged to perform balancing.

Data such as voltage and current of the battery rack sensed by the sensing unit 311 is output through the first input / output unit 313 of the rack BMS 211 and input to the second input / output unit of the bank BMS 220 (S120 ). At this time, data such as voltage and current of the battery rack may be temporarily stored in the buffer unit in the first input / output unit 313 and then transferred to the bank BMS 200 through the first input / output unit 313 in the stored order. The second input / output unit 413 of the bank BMS 220 may be provided with a buffer unit so that the data input to the second input / output unit 413 may be stored in the data storage unit 440 in the order in which they are temporarily stored and then input, (420).

The second controller 420 of the bank BMS 220 estimates the SOH and the SOC of the battery rack using data such as the voltage and current of the battery rack, and calculates the average and deviation of the battery rack (S130). That is, the SOH estimation unit 421 and the SOC estimation unit 422 can be used to estimate SOH and SOC. The SOH can be estimated, for example, by the internal resistance of the battery rack by calculating the internal resistance of the battery rack by applying the current and voltage of the battery rack to Ohm's law. The SOC can integrate the current value measured for a predetermined time measured from the rack BMS and estimate it by dividing it by the estimated battery capacity. In addition, the average and deviation of the voltage, current, SOH, SOC, etc. of the battery rack can be calculated using the arithmetic unit 423.

The data such as voltage, current, SOH, and SOC of the battery rack and their average and deviation can be stored in the data storage unit 440 by the processing unit 424 (S140). At this time, data of the battery rack may be stored in the data storage unit 440 in the form of a table.

The processor 424 processes voltage, current, SOH, and SOC of each battery rack 210 divided and stored for each battery rack by a table or a graph, and transmits the average, deviation, etc. to the manager (S150) . For example, in the form of a table in which data such as voltage, current, SOH, and SOC of each battery rack, average and error of each data, and the like are arranged in the order of the serial numbers of the plurality of battery racks in the row direction, Lt; / RTI > Also, the data of each battery rack 210 may be transmitted to the manager in the form of a relative comparison.

Meanwhile, balancing may be performed on at least one battery rack outside the error range. The processing unit 424 generates a control signal for balancing the battery rack and outputs the control signal through the second input / output unit 430. That is, it generates a control signal to perform balancing of the battery rack above or below the average voltage or current. The corresponding rack BMS 211, which receives a control signal from the bank BMS 220, controls the charging and discharging of all the battery cells using the balancing unit 315.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

410: second power supply unit 420: second control unit
430: second input / output unit 440: data storage unit
421: SOH estimation unit 422: SOC estimation unit
423: operation unit 424:

Claims (9)

A plurality of battery racks;
A plurality of rack BMSs respectively provided in the plurality of battery racks;
At least one bank BMS connected to the plurality of rack BMSs; And
And a power conversion unit for converting direct current power discharged from the plurality of battery racks and converting the direct current power to charge the plurality of battery racks with power applied from the outside,
The bank BMS includes a control unit for estimating SOH and SOC using state data including voltage, current, and resistance of the plurality of battery racks, and calculating an average and a deviation of the SOH and SOC, respectively, Generates a control signal for controlling at least one battery rack in which the deviation of the state data and the estimated data deviates from the error range, and outputs the average and deviation of the state data to the management system, To a plurality of rack BMSs,
Wherein,
An SOH estimator for estimating an SOH of the battery rack;
An SOC estimating unit estimating an SOC of the battery rack;
An operation unit for calculating an average and a deviation of the state data of the battery rack and the SOH and the SOC,
And a processor for storing the state data and the estimated SOH and SOC in a data storage unit and outputting the state data and the estimated SOH and SOC to an administrator.
The method of claim 1,
An input / output unit for inputting / outputting data to / from the plurality of rack BMSs and the manager,
And a data storage unit for storing state data, estimated data of the plurality of battery racks, and a mean and an error thereof.
The power storage device of claim 2, wherein the data storage unit stores reference data including a reference voltage of the battery rack, a reference current, and a reference temperature.
delete delete The system of claim 1, wherein the processor is configured to classify state data, SOH, SOC, and average and variance thereof for each of a plurality of battery racks, and transmit the state data, the SOH, and the SOC to the manager system through the input / Storage device.
A plurality of battery racks; A plurality of rack BMSs respectively provided in the plurality of battery racks; At least one bank BMS connected to the plurality of rack BMSs; And a power conversion unit for converting DC power discharged from the plurality of battery racks and converting the DC power discharged from the plurality of battery racks to charge the plurality of battery racks with power applied from the outside, And a controller for estimating SOH and SOC using state data including voltage, current, and resistance, and calculating an average and a deviation of the SOH and SOC, respectively, wherein the controller includes an SOH estimator for estimating an SOH of the battery rack, An SOC estimating unit for estimating an SOC of the battery rack; an arithmetic unit for calculating an average and a deviation of the state data of the battery rack and the SOH and the SOC; and storing the state data and the estimated SOH and SOC in a data storage unit And a processing section for processing to output to the manager, the method comprising:
Sensing state data of a battery rack including voltage, current, and temperature of each of the plurality of battery racks;
Estimating SOH and SOC of the battery rack using the state data of the battery rack, calculating state data and an average and deviation of the estimated SOH and SOC;
Storing the state data and the estimated data of the battery rack and an average and a deviation of each of the state data and the estimated data in a data storage unit and delivering the data to the manager,
The bank BMS further comprises generating a control signal for controlling at least one battery rack whose deviation of the state data and the estimated data is out of an error range and delivering the control signal to the rack BMS of the corresponding battery rack .
The method as claimed in claim 7, wherein the storing and storing the state data and the estimated data of the battery rack, respectively,
And transferring the state data and the estimated data for each of the plurality of battery racks to the management system in a form including a table, a graph, and a figure by dividing an average and a deviation of the state data and the estimated data.
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