JP2024041522A - Calculation device, method for calculating deterioration state, and program - Google Patents

Abstract

To provide a calculation device capable of accurately calculating the current and future deterioration state in a power storage element.SOLUTION: A calculation device comprises an acquisition unit that acquires actual measurement data and virtual measurement data of a power storage element, and a calculation unit that calculates the current and future deterioration state of the power storage element based on the measurement data of the power storage element. The calculation unit calculates a deterioration state according to a predetermined calculation algorithm based on the actual measurement data acquired by the acquisition unit when calculating the current deterioration state, and calculates a deterioration state according to the predetermined calculation algorithm based on the virtual measurement data acquired by the acquisition unit when calculating the future deterioration state.SELECTED DRAWING: Figure 1

Description

The present invention relates to a calculation device, a deterioration state calculation method, and a program.

Energy storage devices are batteries for uninterruptible power supplies (backup), batteries for motive power of automobiles, trains, and aircraft, or batteries for auxiliary equipment, or batteries for renewable energy power plants that guarantee a stable power supply. etc. are widely used.

It is known that a power storage element progresses in deterioration through repeated charging and discharging, and its power storage capacity gradually decreases. In order to effectively utilize a power storage element, it is important to understand how much the power storage capacity decreases.

Patent Document 1 discloses a battery capacity prediction device that can predict battery capacity. In Patent Document 1, the battery capacity at a predetermined point in time is determined by calculating the amount of battery capacity deterioration over a certain period of time based on the state of charge, temperature, and elapsed time of the battery, and subtracting the integrated value of the deterioration amount from the initial battery capacity. Calculate.

Patent Document 2 discloses a technique for improving the accuracy of predicting the future deterioration state of lithium ion secondary batteries currently in use. In Patent Document 2, data on past products that match or approximate the current state of the prediction target, extracted from the usage history of the secondary battery registered in a database, are used to determine the current state of the secondary battery to be predicted. predict the lifespan of

Japanese Patent Application Publication No. 2000-228227 Patent No. 6411538

Regarding calculation of the deterioration state of the power storage element, there is a need to calculate both the current deterioration state and the future deterioration state of the power storage element. Patent Document 1 proposes separate techniques for calculating the current state of deterioration and the future state of deterioration, but sufficient studies have not yet been conducted on integrating them to calculate the state of deterioration. .

Further, in Patent Document 1, when calculating the future power storage capacity, historical data of the power storage element up to the present is not taken into account, and the current state of deterioration of the power storage element cannot be appropriately grasped. The storage capacity and the state of deterioration may differ, for example, depending on the usage history such as the operating temperature range and usage conditions (e.g. cycle use, stationary use, etc.), even if the storage capacity is the same, the SOH (State of Health) may differ. are often different. In such a case, predicting the future state of deterioration from the current state of deterioration that is not based on historical data will result in poor prediction accuracy.

The technology described in Patent Document 2 cannot predict the lifespan if there is no data on past products that match or approximate the current state of the prediction target. Furthermore, since the predictable period is limited to the period corresponding to the data interval of registered past products, it is difficult to predict the lifespan over a long period from the viewpoint of data accumulation.

The objective of this disclosure is to provide a calculation device etc. that can accurately calculate the current and future deterioration state of a storage element.

A calculation device according to an aspect of the present disclosure includes an acquisition unit that acquires actual measurement data and virtual measurement data of a power storage element, and calculates a current and future deterioration state of the power storage element based on the measurement data of the power storage element. and a calculating section. When calculating the current deterioration state, the calculation section calculates the deterioration state according to a predetermined calculation algorithm based on the actual measurement data acquired by the acquisition section, and when calculating the future deterioration state, the acquisition section calculates the deterioration state. The deterioration state is calculated based on the acquired virtual measurement data according to the predetermined calculation algorithm.

According to the present disclosure, the current and future deterioration states of a power storage element can be calculated with high accuracy.

FIG. 1 illustrates an example of the configuration of a remote monitoring system. FIG. 1 is a block diagram showing a configuration example of a power generation system. It is a block diagram showing an example of composition of a calculation device. FIG. 2 is a functional block diagram showing a configuration example of a calculation device. 12 is a flowchart illustrating an example of a deterioration state calculation process procedure. It is a flowchart which shows an example of the processing procedure which the calculation device of 2nd Embodiment performs.

(1) A calculation device according to one aspect of the present disclosure includes an acquisition unit that acquires actual measurement data and virtual measurement data of a power storage element, and current and future deterioration of the power storage element based on the measurement data of the power storage element. and a calculation unit that calculates the state. When calculating the current deterioration state, the calculation section calculates the deterioration state according to a predetermined calculation algorithm based on the actual measurement data acquired by the acquisition section, and when calculating the future deterioration state, the acquisition section calculates the deterioration state. The deterioration state is calculated based on the acquired virtual measurement data according to the predetermined calculation algorithm.

According to a calculation device according to one aspect of the present disclosure, it is possible to standardize the estimation process for calculating the current degradation state and the prediction process for calculating the future degradation state. By standardizing the calculation algorithm, not only is the number of algorithms to be stored reduced, but the process for selecting a calculation algorithm according to the case is not required, and the process flow can be simplified. In addition, although the accuracy may differ depending on the calculation algorithm, standardization prevents the accuracy from differing between the current and future degradation states. In other words, by standardizing the calculation algorithm, it is possible to inherit the state of the storage element in the estimation process of the current degradation state and perform the prediction process of the future degradation state with the same accuracy. It is possible to calculate a degradation state that has continuity between the past, present, and future, and to improve the consistency of the calculation results of the degradation state.

(2) In the calculation device according to (1) above, the calculation unit calculates the current state of deterioration based on the actual measurement data, and then calculates the virtual measurement data generated based on the actual measurement data. The future state of deterioration may be calculated based on the following.

According to the calculation device described in (2) above, the deterioration state calculation algorithm for the current deterioration state estimation process and the future deterioration state prediction process is made common, and the future deterioration state is calculated after the current deterioration state is calculated. In order to predict the state of deterioration, processing can be switched according to the input measurement data, and the state of deterioration at any point in time can be efficiently calculated while ensuring data continuity. Furthermore, since virtual measurement data is generated based on actual measurement data and future deterioration conditions are predicted, accuracy is improved.

(3) In the calculation device according to (1) or (2) above, the calculation unit may calculate a future deterioration state using the current deterioration state calculated based on the actual measurement data as a reference value. .

According to the calculation device described in (3) above, the calculation result of the current state of deterioration can be reflected in the future state of deterioration. For example, since the future deterioration state can be continuously calculated using the current deterioration state value as an initial value, the prediction accuracy of the deterioration state can be improved.

(4) In the calculation device according to any one of (1) to (3) above, a load estimating unit that estimates a virtual load of the power storage element based on time-series actual measurement data, and the load estimator. The generating unit may also include a generating unit that generates the virtual measurement data based on the virtual load estimated by the unit.

A "virtual load" is a virtual load and means how a virtual power storage element is used. The virtual load may include information indicating, for example, virtual power, environmental temperature, heat dissipation conditions of the power storage element such as heat transfer coefficient or thermal conductivity, a control method of the power storage element, and the like.

In order to standardize the calculation algorithm for calculating the current and future deterioration states, unmeasured measurement data to be used for calculating the future deterioration states is required. According to the calculation device described in (4) above, by estimating the virtual load based on the history of the actual measured values of the energy storage element and generating measurement data from the estimated virtual load, the usage state of the energy storage element can be adjusted. Corresponding virtual measurement data can be suitably generated. By generating virtual measurement data over a desired period, it becomes possible to predict the lifespan in any prediction period.

(5) In the calculation device according to (4) above, the generation unit generates a plurality of virtual measurement data based on a plurality of virtual load patterns, and the calculation unit generates future data corresponding to each virtual measurement data. The state of deterioration may also be calculated.

According to the calculation device described in (5) above, it is possible to calculate a wide range of deterioration states assuming various usage modes. Since the future state of deterioration is calculated based on virtual measurement data, the reliability of the calculation result is lower than that of the current state of deterioration that is calculated based on actual measurement data. By calculating the deterioration state with a range, it is possible to improve the reliability of predicting the future deterioration state.

(6) In the calculation device according to any one of (1) to (5) above, the calculation unit calculates an internal state quantity of the electricity storage element based on measurement data of the electricity storage element, and The deterioration state of the power storage element may be calculated based on the internal state quantity.

The internal state quantity may include, for example, the SOC (State of Charge) of the power storage element, internal temperature, positive electrode capacity, negative electrode capacity, capacity balance shift, and the like. A shift in capacity balance refers to a difference in capacity between the positive electrode and the negative electrode of a power storage element, in which charged ions can reversibly enter and exit from the electrodes. Please refer to Japanese Patent No. 6428958 for details on the capacity imbalance.

According to the calculation device described in (6) above, the deterioration state can be calculated by accurately considering the deterioration state and usage history of the power storage element by converting the measurement data into the history of internal state quantities. The calculation accuracy can be improved.

(7) The calculation device according to any one of (1) to (6) above, further comprising a correction section that corrects the predetermined calculation algorithm based on correction information of the current state of deterioration calculated by the calculation section. It's okay.

According to the calculation device described in (7) above, the calculation accuracy of the deterioration state can be improved by correcting the calculation algorithm based on the correction information. The accuracy of the calculation algorithm can be improved while calculating (while operating the calculation device). The built-in calculation algorithm is not immutable, and the calculation device can autonomously evolve the calculation algorithm in a direction that improves accuracy.

(8) A method for calculating a state of deterioration according to one aspect of the present disclosure is to obtain actual measurement data and virtual measurement data of a power storage element, and when calculating the current state of deterioration, based on the obtained actual measurement data. When calculating the deterioration state according to a predetermined calculation algorithm and calculating the future deterioration state, the computer executes a process of calculating the deterioration state according to the predetermined calculation algorithm based on the acquired virtual measurement data.

(9) When the program according to one aspect of the present disclosure acquires actual measurement data and virtual measurement data of a power storage element and calculates the current state of deterioration, the program uses a predetermined calculation algorithm based on the acquired actual measurement data. When calculating the state of deterioration according to the method and calculating the state of deterioration in the future, the computer is caused to execute a process of calculating the state of deterioration according to the predetermined calculation algorithm based on the acquired virtual measurement data.

Hereinafter, the present disclosure will be specifically described with reference to drawings showing embodiments thereof.

(First embodiment)
FIG. 1 is a diagram showing a configuration example of a remote monitoring system 100. Remote monitoring system 100 allows remote access to information regarding power storage elements included in power generation system 200. The remote monitoring system 100 includes a power generation system 200 to be remotely monitored, and a calculation device 50 that collects information from the power generation system 200. The calculation device 50 and the power generation system 200 are communicably connected via a network N1 such as the Internet. The number of power generation systems 200 may be one or three or more. The calculation device 50 may be integrated into any of the power generation systems 200.

FIG. 2 is a block diagram showing a configuration example of the power generation system 200. Illustrations of power generation devices such as solar power generation systems and wind power generation systems are omitted. The power generation system 200 includes a communication device 10, a domain management device 30, and a power storage unit (domain) 40. Server device 20 is connected to communication device 10 via network N2. Power storage unit 40 may include a plurality of banks 41. The power storage unit 40 is housed in a battery panel, for example, and is used in a thermal power generation system, a mega solar power generation system, a wind power generation system, an uninterruptible power supply (UPS), a stabilized power supply system for railways, etc. Ru. A configuration including the communication device 10, the domain management device 30, and the power storage unit 40 is called a power storage system. The power storage system may include a power conditioner (not shown). The power storage unit 40 is not limited to industrial use, and may be used for home use.

The business operator designs, installs, operates, and maintains a power storage system including the communication device 10, the domain management device 30, and the power storage unit 40, and can remotely monitor the power storage system using the remote monitoring system 100.

The communication device 10 includes a control unit 11, a memory unit 12, a first communication unit 13, and a second communication unit 14. The control unit 11 is composed of a CPU (Central Processing Unit) and the like, and controls the entire communication device 10 using built-in memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory).

The storage unit 12 includes, for example, a nonvolatile storage device such as a flash memory. The storage unit 12 can store necessary information, for example, information obtained through processing by the control unit 11.

The first communication unit 13 includes a communication interface that realizes communication with the domain management device 30 or the battery management device 44. The control unit 11 can communicate with the domain management device 30 through the first communication unit 13.

The second communication unit 14 includes a communication interface that realizes communication via the network N2. The control unit 11 can communicate with the server device 20 through the second communication unit 14.

The domain management device 30 sends and receives information to and from each bank 41 using a predetermined communication interface. The storage unit 12 can store operational data acquired via the domain management device 30.

The server device 20 can collect actual values of measurement data of the energy storage system from the communication device 10. The measurement data includes measurement values such as the current value, voltage value, and temperature of each energy storage element in the energy storage system. The server device 20 classifies and stores the collected measurement data for each energy storage element. The server device 20 can transmit the measurement data to the calculation device 50 via the networks N2 and N1. Note that the networks N1 and N2 may be a single communication network. The server device 20 may function as the calculation device 50.

The bank 41 includes a plurality of power storage modules connected in series, and includes a battery management unit (BMU) 44, a plurality of power storage modules 42, and a measurement board (CMU: Cell Management Unit) provided in each power storage module 42. Unit) 43, etc.

The power storage module 42 has a plurality of power storage cells connected in series. In this specification, a "power storage element" may mean a power storage cell, a power storage module 42, a bank 41, or a domain in which banks 41 are connected in parallel. In this embodiment, the measurement board 43 acquires power storage element information regarding the state of each power storage cell of the power storage module 42. The power storage element information includes, for example, the voltage, current, temperature, etc. of the power storage cell. The power storage element information can be repeatedly acquired at appropriate intervals, such as 0.1 seconds, 0.5 seconds, 1 second, etc., for example. The power storage element information becomes measurement data or a part of the measurement data. The "power storage element" is preferably a rechargeable secondary battery such as a lead-acid battery or a lithium ion battery, or a capacitor. A portion of the power storage element may be a non-rechargeable primary battery.

The battery management device 44 can communicate with the measurement board 43 with a communication function via serial communication, and can acquire the storage element information detected by the measurement board 43. The battery management device 44 can transmit and receive information to and from the domain management device 30. The domain management device 30 aggregates the storage element information from the battery management devices 44 of the banks belonging to the domain. The domain management device 30 outputs the aggregated storage element information to the communication device 10. In this way, the communication device 10 can acquire the measurement data of the storage unit 40 via the domain management device 30. The communication device 10 transmits the acquired measurement data to the calculation device 50 via the server device 20.

FIG. 3 is a block diagram showing a configuration example of the calculation device 50. The calculation device 50 is, for example, a server computer, a personal computer, a quantum computer, etc., and performs various information processing and transmission and reception of information. The calculation device 50 may be a multicomputer consisting of a plurality of computers, or may be a virtual machine virtually constructed by software. The calculation device 50 includes a control section 51, a storage section 52, a communication section 53, a display section 54, an operation section 55, and the like.

The control unit 51 is an arithmetic circuit including a CPU, a GPU (Graphics Processing Unit), a ROM, a RAM, and the like. The CPU or GPU included in the control unit 51 executes various computer programs stored in the ROM or the storage unit 52, and controls the operations of the hardware units described above. The control unit 51 may have functions such as a timer that measures the elapsed time from when a measurement start instruction is given until a measurement end instruction is given, a counter that counts, a clock that outputs date and time information, and the like.

The storage unit 52 includes a nonvolatile storage device such as a flash memory or a hard disk drive. The storage unit 52 stores various computer programs, data, etc. that are referenced by the control unit 51.

In this embodiment, the storage unit 52 stores a program 521 for causing a computer to execute processing related to calculating the deterioration state of the power storage element, and a measurement DB (Data Base) 522 as data necessary for executing the program 521. ing.

The measurement DB 522 is a database that stores the measurement data received from the power generation system 200. As described above, the measurement data includes the measurement values of the current, voltage, and temperature of the storage elements in the power generation system 200. The measurement DB 522 stores records in chronological order, for example, in which an ID for identifying the measurement data is used as a key to link information such as the identification information of the storage elements, the measurement date and time of the measurement value, and the measurement data. The measurement DB 522 may further store a deterioration state based on the measurement data at each point in time. The measurement DB 522 stores the actual values of the measurement data. When the control unit 51 receives measurement data transmitted from the server device 20, it stores the received measurement data, etc. in the measurement DB 522 in chronological order.

A computer program (program product) including the program 521 may be provided by a non-temporary recording medium 5A on which the computer program is readably recorded. The recording medium 5A is a portable memory such as a CD-ROM, a USB memory, or an SD (Secure Digital) card. The control unit 51 reads a desired computer program from the recording medium 5A using a reading device (not shown), and stores the read computer program in the storage unit 52. Alternatively, the computer program may be provided via communication. Program 521 may be a single computer program or may consist of multiple computer programs, and may be executed on a single computer or multiple computers interconnected by a communications network. good.

The communication unit 53 includes a communication interface that realizes communication via the network N1. The control unit 51 receives measurement data transmitted from the power generation system 200 through the communication unit 53.

The display unit 54 includes a display device such as a liquid crystal display or an organic EL (electroluminescence) display. The display section 54 displays various information according to instructions from the control section 51. The operation unit 55 is an interface that accepts user operations. The operation unit 55 includes, for example, a keyboard, a touch panel device with a built-in display, a speaker, a microphone, and the like. The operation unit 55 receives operation input from the user and sends a control signal to the control unit 51 according to the operation content.

The calculation device 50 may be configured to accept operations through an externally connected computer and output information to be notified to the external computer. In this case, the calculation device 50 does not need to include the display section 54 and the operation section 55.

FIG. 4 is a functional block diagram showing a configuration example of the calculation device 50. The control unit 51 of the calculation device 50 reads and executes the program 521 stored in the storage unit 52, thereby controlling the functions of the acquisition unit 511, the calculation unit 512, the load estimation unit 513, the generation unit 514, and the output unit 515. Realize. Alternatively, some of these functions may be realized by a dedicated hardware circuit (for example, FPGA or ASIC) provided in the control unit 51.

The acquisition unit 511 acquires measurement data of the power storage element. When estimating the current (current) state of deterioration, the acquisition unit 511 acquires actual measurement data by reading desired measurement data from the measurement data stored in the measurement DB 522. Actual measurement data means actual measured values of measurement data. Further, when predicting a future state of deterioration, the acquisition unit 511 acquires virtual measurement data by accepting virtual measurement data output from the generation unit 514, which will be described later. Virtual measurement data is measurement data that is virtually generated and means unmeasured measurement data. The acquisition unit 511 may include a first acquisition unit 511 that acquires actual measurement data, and a second acquisition unit 511 that acquires virtual measurement data.

The calculation unit 512 calculates the deterioration state of the power storage element based on the actual measurement data or virtual measurement data acquired by the acquisition unit 511. The calculation unit 512 calculates the state of deterioration according to a predetermined calculation algorithm for calculating the storage capacity of the storage element based on the measurement data. In the following, a case will be described in which the storage capacity (battery capacity) of the storage element is calculated as the deteriorated state. Alternatively, the state of deterioration may be, for example, internal resistance, charge/discharge characteristics, amount of deterioration in storage capacity (e.g. amount of deterioration when energized and amount of deterioration when not energized), SOH, deterioration rate of positive electrode/negative electrode, shift in capacity balance, etc. Good too.

In this embodiment, an example calculation algorithm will be described in which an internal state quantity of a power storage element is calculated based on measurement data, and a deterioration state is calculated based on the calculated internal state quantity. Not limited.

The calculation unit 512 calculates time-series data of internal state quantities including the SOC and temperature of the power storage element based on the measurement data obtained in time-series. Based on the measurement data and the history of the calculated SOC and temperature, the calculation unit 512 sharply distinguishes between energized deterioration, which indicates deterioration due to energization of the power storage element, and non-energized deterioration, which represents deterioration not caused by energization of the power storage element, For example, each amount of deterioration is calculated based on the root rule. The calculation unit 512 calculates the amount of energization deterioration based on the amount of SOC fluctuation (size of fluctuation) specified based on the SOC time series data such that the larger the amount of SOC fluctuation, the larger the amount of energization deterioration. It is preferable to do so.

The calculation unit 512 calculates the total amount of deterioration based on the sum of the obtained energized deterioration amount and the non-energized deterioration amount. The calculation unit 512 can obtain the power storage capacity of the power storage element at the time of calculation by subtracting the calculated total amount of deterioration from the previous power storage capacity (the power storage capacity at the time immediately before the time of calculation).

When estimating the current deterioration state, the calculation unit 512 accepts the actual measurement data acquired by the acquisition unit 511, and calculates the current storage capacity by the above calculation algorithm using the accepted actual measurement data. The calculation unit 512 may sequentially calculate the storage capacity at each point in time based on the measurement data at each point in time during the entire period from the beginning of measurement to the present, and the initial capacity at the beginning of measurement, to calculate the current storage capacity.

Further, when predicting a future state of deterioration, the calculation unit 512 receives the virtual measurement data acquired by the acquisition unit 511, and calculates the future power storage capacity using the above calculation algorithm using the received virtual measurement data. . The calculation unit 512 may calculate the future power storage capacity using the current power storage capacity obtained through the above-described estimation process as a reference value. That is, the calculation unit 512 may calculate the power storage capacity at a future point in time by subtracting the total amount of deterioration calculated by virtual measurement data and a calculation algorithm from the current power storage capacity.

The SOC estimated based on the measurement data differs depending on the state of deterioration of the power storage element. By using the current storage capacity as a reference value when calculating the future storage capacity, it becomes possible to calculate the future storage capacity while maintaining the deterioration state of the storage element represented by the current storage capacity. .

The calculation unit 512 may correct the calculated current storage capacity based on the diagnosis result of the current storage capacity of the storage element. The diagnosis result means, for example, a capacitance value (storage capacity) of a power storage element specified based on measurement data of the power storage element in the most recent short period of time. The method of diagnosing the storage capacity is not particularly limited, but, for example, the storage capacity may be calculated by measuring the internal resistance of the storage element, and the storage capacity can be fully charged and discharged from the lower limit voltage value to the upper limit voltage set for the storage element. The actual capacity may be measured by performing the following. The calculation unit 512 compares the acquired diagnosis result with the calculated current storage capacity, and corrects the calculated current storage capacity to match the diagnosis result. Correction using the diagnosis result may be performed every time the power storage capacity at each time point is calculated. The correction using the diagnosis result may not be performed on the future calculation result of the storage capacity.

The load estimating unit 513 estimates the virtual load of the power storage element based on time-series actual measurement data. The load estimating unit 513 estimates a future electric power value and environmental temperature as a virtual load, for example, based on the history of measurement data from the initial point to the present time. The power value is determined by predicting how the power storage element will be used in the future, based on the way the power storage element has been used up to the present, which is indicated by the history of measurement data. The electric power value and environmental temperature as a virtual load may be the same as the actual electric power value and environmental temperature specified based on the history of measurement data, and at least one of the actual electric power value and environmental temperature may be determined based on a predetermined rule. It may be an increased or decreased value.

The load estimation unit 513 may generate multiple patterns of virtual loads. By generating multiple virtual loads with different power values and/or different environmental temperatures, it becomes possible to predict a wide range of future degradation states.

The generation unit 514 generates virtual measurement data based on the virtual load estimated by the load estimation unit 513. The generation unit 514 derives measurement data at a future point in time, that is, current, voltage, and temperature, based on the power value and environmental temperature estimated by the load estimation unit 513. When receiving a plurality of virtual loads from the load estimation section 513, the generation section 514 generates a plurality of measurement data corresponding to each virtual load. The virtual measurement data generated by the generation unit 514 is output to the acquisition unit 511.

The output unit 515 outputs information indicating the calculation results of the current and future storage capacities calculated by the calculation unit 512 to the display unit 54. The display unit 54 displays the information indicating the calculation results of the storage capacities.

The control unit 51 may further have a configuration that functions as a modification unit 516 as shown in FIG. The modification unit 516 modifies the calculation algorithm based on the current power storage capacity modification information calculated by the calculation unit 512. The modification unit 516 will be described in detail in other embodiments.

Figure 5 is a flowchart showing an example of a deterioration state calculation process procedure. The control unit 51 of the calculation device 50 starts the following process at a predetermined or appropriate interval according to the program 521 stored in the memory unit 52. In parallel with the processing of the program 521, the control unit 51 receives measurement data transmitted from the server device 20 and stores the received measurement data in the measurement DB 522.

The control unit 51 of the calculation device 50 determines whether to perform estimation processing to calculate the current state of deterioration (step S11). The control unit 51 may determine whether to perform the estimation process, for example, by determining whether the current state of deterioration has been stored in the measurement DB 522. The fact that the current state of deterioration has been stored in the measurement DB 522 means that the current state of deterioration has already been estimated for the latest measurement data stored in the measurement DB 522.

If it is determined that the estimation process is to be performed because the current state of deterioration has not been stored (step S11: YES), the control unit 51 obtains actual measurement data by extracting the measurement data to be stored in the measurement DB 522. (Step S12).

If it is determined that the estimation process is not to be performed because the current state of deterioration has been stored (step S11: NO), the control unit 51 determines that the process of predicting the future state of deterioration is to be performed, and the process proceeds to step S13. Proceed. Step S11 corresponds to switching processing between estimation processing and prediction processing.

In step S11, the control unit 51 may determine whether to perform the estimation process or the prediction process by receiving an instruction to execute the estimation process or the prediction process from the user.

When executing the prediction process of the future deterioration state, the control unit 51 estimates the virtual load of the power storage element based on the measurement data stored in the measurement DB 522 during the entire period from the beginning of measurement to the present (step S13). In step S13, the control unit 51 may estimate a plurality of virtual loads.

The control unit 51 generates virtual measurement data based on the estimated virtual load (step S14). When a plurality of virtual loads are estimated, the control unit 51 generates a plurality of virtual measurement data corresponding to each virtual load.

The control unit 51 calculates the SOC and temperature as internal state quantities based on the acquired actual measurement data or virtual measurement data (step S15). The control unit 51 calculates the storage capacity at the calculation target time point based on the calculated internal state amount and the internal state amount at the previous time point (step S16).

When the time point at which the calculation is executed is the current time t, the control unit 51 calculates the internal state quantity corresponding to the actual measurement data at the most recent time point t-1 in the past, and uses the calculated amount from the storage capacity at the most recent time point t-1. By subtracting the amount of deterioration corresponding to the internal state amount, the storage capacity at the current time t is calculated. Further, the control unit 51 calculates an internal state quantity corresponding to the virtual measurement data at the present time t, and subtracts the amount of deterioration corresponding to the calculated internal state quantity from the power storage capacity at the present time t. Calculate the storage capacity at t+1. By repeatedly calculating the power storage capacity at a future point in time, it becomes possible to predict the power storage capacity over an arbitrary prediction period.

The control unit 51 determines whether or not to correct the calculated storage capacity (step S17). For example, if the calculated power storage capacity is the current power storage capacity, and the absolute value of the difference between the calculated power storage capacity and the diagnosis result of the power storage capacity is equal to or greater than a preset threshold, the control unit 51 controls the power storage capacity. It is determined that it is corrected. On the other hand, if the calculated power storage capacity is the current power storage capacity and the absolute value of the difference between the calculated power storage capacity and the diagnostic result of the power storage capacity is less than a preset threshold, the control unit 51 controls the power storage capacity. is determined not to be corrected. Further, if the calculated power storage capacity is not the current power storage capacity, the control unit 51 determines not to correct the power storage capacity. As the power storage capacity diagnosis result, for example, a power storage capacity diagnosis result performed by an external diagnostic device may be obtained.

If it is determined that the power storage capacity is to be corrected (step S17: YES), the control unit 51 corrects the calculated current power storage capacity so as to be in line with the diagnosis result (step S18). Further, the control unit 51 may correct the internal state quantity and SOH so as to match the corrected storage capacity. For example, the absolute values of the non-energized deterioration amount and the energized deterioration amount may be corrected without changing the ratio thereof. The control unit 51 may replace the calculated current storage capacity with the capacity value in the diagnosis result. If it is determined that the power storage capacity is not to be corrected (step S17: NO), the control unit 51 skips the correction process. Step S17 and step S18 may be omitted.

The control unit 51 determines whether or not to end the calculation of the storage capacity (step S19). For example, if it is determined that the calculation of the storage capacity is not to end because either the current or future storage capacity has not been calculated (step S19: NO), the control unit 51 returns the process to step S11. As a result, after the control unit 51 executes the estimation process of the current storage capacity, it switches the process from the estimation process to the prediction process and executes the prediction process of the future storage capacity.

If it is determined that the calculation of the electricity storage capacity is to be completed because both the current and future electricity storage capacities have been calculated (step S19: YES), the control unit 51 generates screen information indicating the calculation result of the electricity storage capacity. , screen information indicating the generated calculation result of the storage capacity is displayed on the display unit 54 (step S20). The control unit 51 ends the series of processing. On the screen showing the calculation result of the power storage capacity, for example, numerical values and graphs showing the power storage capacity at each point in time up to the present and the power storage capacity at a future point in time are displayed.

According to this embodiment, it is possible to accurately calculate the current and future deterioration states with continuity. By using a common deterioration state calculation algorithm for estimating the current deterioration state and predicting the future deterioration state, the deterioration state can be calculated efficiently and accurately. In addition, the processing content before and after the calculation algorithm is set in accordance with the estimation process or prediction process, such as calculating a wide range of deterioration states when predicting future deterioration states in response to the reliability of the measurement data that is the input element. can do.

Second Embodiment
In the second embodiment, the algorithm for calculating the deterioration state is modified.

The calculation device 50 of the second embodiment corrects the calculation algorithm based on correction information of the current state of deterioration by functioning as the correction unit 516 shown in FIG. The correction information may be determined, for example, based on the content of correction of the current state of deterioration. The correction unit 516 specifies a correction pattern by analyzing the correction contents executed at each time point from the beginning of measurement to the present. The modification unit 516 uses the identified correction pattern as modification information and modifies the calculation algorithm according to the identified correction pattern.

FIG. 6 is a flowchart illustrating an example of a processing procedure executed by the calculation device 50 of the second embodiment.

The control unit 51 of the calculation device 50 acquires correction information of the calculation algorithm (step S31). The control unit 51 may acquire correction information generated by an external device through communication, and may obtain correction information by deriving a specific correction pattern based on the correction contents executed at each point from the beginning of measurement to the present. You may obtain it.

The control unit 51 modifies the calculation algorithm according to the acquired modification information (step S32), and ends the series of processing.

According to this embodiment, the calculation algorithm can be optimized through operation of this system, and the accuracy of estimating the deterioration state is improved.

The embodiments disclosed herein are illustrative in all respects and should be considered not to be restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all changes within the scope of the claims and the range of equivalents to the scope of the claims. be done.
The sequences shown in each embodiment are not limited, and each processing procedure may be executed with the order changed, or a plurality of processes may be executed in parallel, as long as there is no contradiction. The processing entity of each process is not limited, and the processes of each device may be executed by other devices as long as there is no contradiction.

Items described in each embodiment can be combined with each other. Moreover, independent claims and dependent claims described in the claims can be combined with each other regardless of the form of citation. Further, although the scope of claims uses a format in which claims refer to two or more other claims (multi-claim format), the invention is not limited to this format. It may be written using a multi-claim format that cites at least one multi-claim.

100 remote monitoring system 200 power generation system 10 communication device 11 control unit 12 storage unit 13 first communication unit 14 second communication unit 20 server device 30 domain management device 40 power storage unit 41 bank 42 power storage module 43 measurement board 44 battery management device 50 calculation Device 51 Control section 52 Storage section 53 Communication section 54 Display section 55 Operation section 511 Acquisition section 512 Calculation section 513 Load estimation section 514 Generation section 515 Output section 516 Modification section 521 Program 5A Recording medium

Claims (9)

an acquisition unit that acquires actual measurement data and virtual measurement data of the power storage element;
a calculation unit that calculates the current and future deterioration state of the power storage element based on measurement data of the power storage element,
When calculating the current deterioration state, the calculation section calculates the deterioration state according to a predetermined calculation algorithm based on the actual measurement data acquired by the acquisition section, and when calculating the future deterioration state, the acquisition section calculates the deterioration state. A calculation device that calculates a state of deterioration based on the acquired virtual measurement data according to the predetermined calculation algorithm. The calculation unit calculates the current state of deterioration based on the actual measurement data, and then calculates the future state of deterioration based on the virtual measurement data generated based on the actual measurement data. calculation device. The calculation device according to claim 1 or 2, wherein the calculation unit calculates a future deterioration state using a current deterioration state calculated based on the actual measurement data as a reference value. a load estimation unit that estimates a virtual load of the electricity storage element based on time-series actual measurement data;
The calculation device according to claim 1 or 2, further comprising a generation unit that generates the virtual measurement data based on the virtual load estimated by the load estimation unit. The generating unit generates a plurality of the virtual measurement data based on a plurality of virtual load patterns,
The calculation device according to claim 4 , wherein the calculation unit calculates a future degradation state corresponding to each virtual measurement data. The calculation unit calculates an internal state quantity of the power storage element based on measurement data of the power storage element,
The calculation device according to claim 1 or 2, wherein the deterioration state of the electricity storage element is calculated based on the calculated internal state quantity. The calculation device according to claim 1 or 2, further comprising a modification unit that modifies the predetermined calculation algorithm based on modification information of the current state of deterioration calculated by the calculation unit. Acquiring actual measurement data and virtual measurement data of the energy storage element;
When calculating the current deterioration state, the deterioration state is calculated according to a predetermined calculation algorithm based on the acquired actual measurement data,
When calculating a future deterioration state, the deterioration state is calculated based on the acquired virtual measurement data in accordance with the predetermined calculation algorithm by a computer. Acquire actual measurement data and virtual measurement data of the energy storage element,
When calculating the current state of deterioration, the state of deterioration is calculated according to a predetermined calculation algorithm based on the acquired actual measurement data,
When calculating a future state of deterioration, the program causes a computer to execute a process of calculating the state of deterioration according to the predetermined calculation algorithm based on the acquired virtual measurement data.

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