Data interpolation system, data interpolation method, and data interpolation program product

Abstract

In a data interpolation system (10), a data acquisition unit (111) acquires device data relating to the operation of a device in which a battery is mounted, and battery data of the battery including at least time-series data of current. An operation state determination unit (112) determines the operation state of the device and the operation state of the battery at each time on the basis of the device data and the battery data. A defect determination unit (113) determines whether or not a defect section is included in the battery data. An interpolation method selection unit (114) selects an interpolation method for the battery data of the defective section on the basis of the operating state of the device and the operating state of the battery. The interpolation unit (115) uses the selected interpolation method to interpolate the battery data of the defective section on the basis of at least the battery data other than the defective section.

Description

Technical Field

[0001] The present invention relates to a data interpolation system, a data interpolation method, and a data interpolation program product for interpolating a missing section of battery data. Background Art

[0002] Services that save data related to batteries mounted on devices such as EVs and PCs in a cloud server and analyze the data are becoming widespread. The device that collects data collects data based on a certain sampling period. However, due to noise inside and outside the device, etc., data cannot be collected properly, and sometimes data is collected at intervals longer than the specified sampling interval. In this specification, a data section that does not satisfy the specified sampling interval is called a missing section.

[0003] In the analysis of the remaining capacity, degree of deterioration, etc. of a battery, the charge amount (Ah) obtained by integrating the current value is used. However, when the current data is missing, since the current value cannot be integrated, it becomes difficult to analyze the battery.

[0004] In Patent Document 1, for missing data, three interpolation methods are disclosed: "interpolation using data before and after", "interpolation using data with a high similarity over time", and "interpolation using data having a correlation".

[0005] [Prior Art Documents]

[0006] [Patent Documents]

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-176544 Summary of the Invention

[0008] [Problems to be Solved by the Invention]

[0009] In the above interpolation methods, it is necessary to satisfy prerequisite conditions such as data with a certain change over time, sufficient data acquired in the past, high similarity to the data acquired in the past, and a certain correlation. In particular, when the operation is different every day and the operation state of the system changes during the data missing period, it is difficult to maintain the interpolation accuracy. In addition, when the correlation changes due to the deterioration of the battery, it is also difficult to maintain the interpolation accuracy. For example, if the shape of the SOC (State Of Charge) - OCV (Open Circuit Voltage) curve changes due to deterioration, it is difficult to maintain the interpolation accuracy. If a missing section remains, it is difficult to analyze the battery.

[0010] The present disclosure has been completed in view of the above circumstances, and an object thereof is to provide a technique for accurately interpolating a missing section of battery data.

[0011] [Technical Solution for Solving Technical Problems]

[0012] To solve the above problems, a data interpolation system according to an aspect of the present disclosure includes: a data acquisition unit that acquires device data related to the operation of a device equipped with a battery and battery data of the battery including at least time-series data of current; an operation state determination unit that determines the operation state of the device and the operation state of the battery at each moment based on the device data and the battery data; a defect determination unit that determines whether a defect interval is included in the battery data; an interpolation method selection unit that selects an interpolation method for the battery data in the defect interval according to the operation state of the device and the operation state of the battery; and an interpolation unit that uses the selected interpolation method to interpolate the battery data in the defect interval based at least on the battery data other than the defect interval.

[0013] In addition, any combination of the above components, and a solution obtained by converting the expressions of the present disclosure between devices, systems, methods, computer programs, etc. is also effective as a solution of the present disclosure.

[0014] [Advantages of the Invention]

[0015] According to the present disclosure, it is possible to interpolate the defect interval of the battery data with high accuracy. Description of the Drawings

[0016] Figure 1 is a diagram for explaining a data interpolation system for battery data.

[0017] Figure 2 is an example diagram showing a condition table for determining the operation state of an electric vehicle.

[0018] Figure 3 is a diagram showing a first specific example of a first interpolation method.

[0019] Figure 4 is a diagram showing a second specific example of a first interpolation method.

[0020] Figure 5 is a diagram showing a third specific example of a first interpolation method.

[0021] Figure 6 is a flowchart showing the flow of the basic operation of the data interpolation system according to the embodiment.

[0022] Figure 7 is a diagram showing an interpolation processing example of a first interpolation method of the data interpolation system according to the embodiment.

[0023] Figure 8 is a diagram showing a first specific example of a second interpolation method.

[0024] Figure 9 This is a diagram showing a second specific example of the second interpolation method.

[0025] Figure 10 This is a diagram showing a third specific example of the second interpolation method.

[0026] Figure 11 This is a diagram showing an interpolation processing example of the second interpolation method of the data interpolation system according to the embodiment.

[0027] Figure 12 (a) - (b) are diagrams showing an example of estimating the SOC of the missing section. Detailed implementation manner

[0028] Figure 1 This is a diagram for explaining the data interpolation system 10 for battery data. The data interpolation system 10 is a pre - processing for the analysis and processing of the secondary battery 21 mounted on the electric vehicle 20, and is a system for interpolating data in the missing section when the collected battery data contains a missing section. The data interpolation system 10 can, for example, also be constructed in the company's own facilities of the operator providing the analysis service for the secondary battery 21 mounted on the electric vehicle 20 or on the company's own server installed in the data center. In addition, the data interpolation system 10 can also be constructed on a cloud server using cloud services. In addition, the data interpolation system 10 can also be constructed on multiple servers dispersedly set at multiple sites (data centers, company's own facilities). The multiple servers can be any one of a combination of multiple company's own servers, a combination of multiple cloud servers, or a combination of a company's own server and a cloud server.

[0029] The secondary battery 21 mounted on the electric vehicle 20 supplies power to a drive electric motor (not shown). The secondary battery 21 is composed of a plurality of cells or a plurality of parallel cell blocks connected in series. Each parallel cell block is composed of a plurality of cells connected in parallel.

[0030] The cell can use a lithium - ion battery cell, a nickel - metal hydride battery cell, a lead - acid battery cell, etc. Hereinafter, an example of using a lithium - ion battery cell (nominal voltage: 3.6 - 3.7V) is assumed in this specification. The number of series connections of the cells or parallel cell blocks is determined according to the voltage of the drive electric motor.

[0031] The voltage sensor 22 detects the voltages at both ends of the serially connected cells or parallel cell blocks, respectively. A shunt resistor is serially connected with a plurality of serially connected cells or a plurality of parallel cell blocks. The current sensor 23 detects the current flowing through the serially connected cells or parallel cell blocks based on the voltage across the shunt resistor. Additionally, a Hall element can be used to replace the shunt resistor. The temperature sensor 24 detects the temperature of the plurality of cells or parallel cell blocks based on the partial pressure voltage of the thermistor and the resistor provided in at least one of the plurality of cells or parallel cell blocks.

[0032] The control unit 25 is composed of the cooperation between a BMU (Battery Management Unit) and an ECU (Electronic Control Unit). The BMU combines the OCV method and the current integration method to estimate the SOC. The OCV method is a method for estimating the SOC based on the measured OCV of the cells and the SOC-OCV curve of the cells. The current integration method is a method for estimating the SOC based on the OCV at the start of charge / discharge of the cells and the integrated value of the measured current. As the charge / discharge time becomes longer, the current integration method gradually accumulates the measurement error of the current. Therefore, it is preferable to use the SOC estimated by the OCV method to correct the SOC estimated by the current integration method.

[0033] The BMU samples the voltage, current, temperature, and SOC of the plurality of cells or the plurality of parallel cell blocks periodically (for example, at 10-second intervals). The BMU transmits the battery data including the voltage, current, temperature, and SOC of the plurality of cells or the plurality of parallel cell blocks to the ECU via the in-vehicle network. As the in-vehicle network, for example, CAN (Controller Area Network) or LIN (Local Interconnect Network) can be used.

[0034] The vehicle speed sensor 27 generates a pulse signal proportional to the rotational speed of the axle and transmits it to the ECU. The ECU calculates the vehicle speed and the cumulative driving distance based on the received pulse signal. The ECU can obtain the gear position from the gear lever.

[0035] A GPS sensor can also be provided in the electric vehicle 20. The GPS sensor detects the current position (latitude, longitude) and transmits it to the ECU. The ECU can generate a driving history based on the received current position information. The received current position information can also be used for correcting the cumulative driving distance.

[0036] The communication unit 26 has the function of performing communication signal processing with the communication unit 33 of the charging station 30 and the function of performing wireless signal processing for connecting to the network 5. The communication unit 26 can access the network 5 using, for example, a mobile phone network (cellular network), wireless LAN, V2I (Vehicle-to-Infrastructure), V2V (Vehicle-to-Vehicle), ETC system (Electronic Toll Collection System), or DSRC (Dedicated Short Range Communications).

[0037] The network 5 is a general term for communication paths such as the Internet, dedicated lines, and VPN (Virtual Private Network), and there are no restrictions on its communication medium or protocol. As the communication medium, for example, a mobile phone network, wireless LAN, wired LAN, optical fiber network, ADSL network, or CATV network can be used. As the communication protocol, for example, TCP (Transmission Control Protocol) / IP (Internet Protocol), UDP (User Datagram Protocol) / IP, Ethernet (registered trademark), etc. can be used.

[0038] The ECU can either send the sampled battery data and vehicle data (e.g., vehicle speed, cumulative driving distance, gear position) to the data interpolation system 10 each time or store them in an internal memory and send the battery data and vehicle data stored in the memory to the data interpolation system 10 at a specified timing. In addition, when the electric vehicle 20 is connected to the charging station 30 via a charging cable, the ECU can also send the battery data and vehicle data stored in the memory to the data interpolation system 10 via the charging station 30.

[0039] By connecting the electric vehicle 20 to the charging station 30 with a charging cable, the secondary battery 21 inside the electric vehicle 20 can be charged from the outside. The charging station 30 is connected to the commercial power system 2 to charge the secondary battery 21.

[0040] Generally, charging is carried out with alternating current in the case of normal charging and with direct current in the case of fast charging. When charging with alternating current (e.g., single-phase 100 / 200V), the charging voltage or charging current is controlled by a charger (not shown) inside the electric vehicle 20. When charging with direct current, the charging voltage or charging current is controlled by the power supply unit 31 of the charging station 30. The power supply unit 31 includes a rectifier circuit, a filter, and a DC / DC converter. The rectifier circuit performs full-wave rectification on the alternating current power supplied from the commercial power system 2, and the filter smooths it to generate direct current power. The DC / DC converter controls the voltage or current of the generated direct current power.

[0041] As fast charging standards, for example, CHAdeMO (registered trademark), ChaoJi, GB / T, and Combo (Combined Charging System) can be used. In CHAdeMO, ChaoJi, and GB / T, CAN is adopted as the communication method. In Combo, PLC (Power Line Communication) is adopted as the communication method.

[0042] In addition to the power line, the charging cable using the CAN method also includes a communication line. When connecting the electric vehicle 20 and the charging station 30 with this charging cable, the control unit 25 of the electric vehicle 20 establishes a communication channel with the control unit 32 of the charging station 30. In addition, in the charging cable using the PLC method, the communication signal is superimposed on the power line for transmission.

[0043] The communication unit 33 of the charging station 30 has the function of performing communication signal processing with the communication unit 26 of the electric vehicle 20 and the function of performing signal processing for connecting to the network 5. The communication unit 33 can access the network 5 using, for example, a wired LAN, a wireless LAN, or a mobile phone network.

[0044] The data interpolation system 10 includes a control unit 11, a storage unit 12, and a communication unit 13. The communication unit 13 is a communication interface (e.g., NIC: Network Interface Card) for connecting to the network 5 by wire or wirelessly.

[0045] The control unit 11 includes a data acquisition unit 111, an operation state determination unit 112, a defect determination unit 113, an interpolation method selection unit 114, an interpolation unit 115, and a validity determination unit 116. The functions of the control unit 11 can be realized through the cooperation of hardware resources and software resources or only through hardware resources. As hardware resources, a CPU, ROM, RAM, GPU (Graphics Processing Unit), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), or other LSI can be used. As software resources, an operating system, applications, and other programs can be used.

[0046] The storage unit 12 includes non-volatile recording media such as an HDD and an SSD, and stores various data. The storage unit 12 includes a battery data holding unit 121 and a vehicle data holding unit 122.

[0047] The data acquisition unit 111 acquires battery data and vehicle data from the electric vehicle 20 or the charging station 30, stores the acquired battery data in the battery data holding unit 121, and stores the acquired vehicle data in the vehicle data holding unit 122. Hereinafter, in the present embodiment, it is assumed that the vehicle data related to the operation of the electric vehicle 20 includes time series data of vehicle speed and cumulative travel distance. It is assumed that the battery data of the secondary battery 21 includes time series data of voltage, current, temperature, and SOC.

[0048] The operation state determination unit 112 determines the operation state of the secondary battery 21 and the operation state of the electric vehicle 20 at each sampling time based on the battery data and the vehicle data. The operation state of the vehicle data includes at least an operating state and a stopped state. Hereinafter, in the present embodiment, the operation state of the vehicle data is classified into five states: "power running", "regenerative running", "parking (IG ON)", "idling (IG OFF)", and "parking charging". "Parking charging" means a state in which charging is performed while connected to the charging station 30. The operation state of the secondary battery 21 includes at least a "charging state", a "discharging state", and an "idling state". Hereinafter, in the present embodiment, the operation state of the secondary battery 21 is classified into these three states. Hereinafter, the case where the current is positive is set as the discharging state, the case where the current is negative is set as the charging state, and the case where the current is 0 is set as the idling state. In the case where data cannot be obtained correctly, it becomes an invalid value such as a blank or hexadecimal "FFFF", but all invalid values are set as NaN.

[0049] Figure 2This represents an example of a condition table for determining the operating state of the electric vehicle 20. When the vehicle speed is positive, the current is 0, positive, or NaN, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as power running. When the vehicle speed is positive and the current is negative, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as regenerative running. When the vehicle speed is 0 and the current is positive, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as stopped. When the vehicle speed is 0 and the current is 0, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as idle. When the vehicle speed is 0 and the current is negative, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as charging while stopped.

[0050] When the vehicle speed is NaN, the current is positive or 0, and the cumulative driving distance has a positive change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as power running. When the vehicle speed is NaN, the current is negative, and the cumulative driving distance has a positive change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as regenerative running. When the vehicle speed is NaN, the current is positive, and the cumulative driving distance does not change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as stopped. When the vehicle speed is NaN, the current is 0, and the cumulative driving distance does not change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as idle. When the vehicle speed is NaN, the current is negative, and the cumulative driving distance does not change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as charging while stopped.

[0051] When the vehicle speed is 0, the current is NaN, and the SOC has a positive change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as charging while stopped. When the vehicle speed is 0, the current is NaN, and the SOC does not change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as idle. When the vehicle speed is 0, the current is NaN, and the SOC has a negative change, the operating state determination unit 112 determines the operating state of the electric vehicle 20 as stopped. Additionally, when both the current and the vehicle speed are NaN, or the change amount of the cumulative driving distance and the change amount of the SOC are abnormal values (such as negative values, etc.), the operating state of the electric vehicle 20 is set to the previous value. Furthermore, when sufficient data for state determination cannot be obtained (specifically, in the case of initial data without a previous value), the state of NaN (no state) is maintained.

[0052] Return Figure 1The defect determination unit 113 determines whether the battery data contains a defective section. When the change amount of continuous data (for example, time stamp, cumulative driving distance, SOC, temperature, etc.) exceeds a specified threshold value, the defect determination unit 113 determines that it is a defective section that does not satisfy the specified sampling interval.

[0053] The interpolation method selection unit 114 selects an interpolation method for the battery data of the defective section according to the operation state of the electric vehicle 20 and the operation state of the secondary battery 21. The interpolation unit 115 interpolates the battery data of the defective section using the selected interpolation method, at least based on the battery data outside the defective section. For example, the interpolation unit 115 may also interpolate the battery data of the defective section based on the battery data outside the defective section and the vehicle data.

[0054] The interpolation method selection unit 114 selects an interpolation method according to the combination of the state changes of the electric vehicle 20 and the secondary battery 21 before and after the defective section. First, the first interpolation method for the current data will be described.

[0055] Figure 3 is a diagram showing a first specific example of the first interpolation method. When the cumulative driving distance at the moment immediately after the end of the defective section is greater than a specified threshold value (for example, 3 km) or more than the cumulative driving distance at the moment immediately before the start of the defective section, the interpolation method selection unit 114 determines that the defective section includes a discharge state. The interpolation method selection unit 114 confirms the operation state of the secondary battery 21 before and after the defective section. Figure 3 In the example shown, the operation state of the secondary battery 21 before the defective section is a discharge state, and the operation state of the secondary battery 21 after the defective section is a rest state. In this case, the interpolation method selection unit 114 selects the following first interpolation algorithm.

[0056] The interpolation unit 115 determines the moment when the SOC becomes the maximum value within a specified period (for example, 6 hours) in the past direction from the start moment of the defective section during the discharge period before the defective section. The interpolation unit 115 sets the range from the moment when the SOC becomes the maximum value to the start moment of the defective section as the discharge reference section.

[0057] The interpolation unit 115 calculates the reduction value of the SOC in the discharge reference section. Based on the reduction value of the SOC in the discharge reference section and the time of the discharge reference section, the interpolation unit 115 calculates the reduction value of the SOC per unit time (e.g., 10 seconds) (the time slope of the SOC). Based on the increase value of the cumulative driving distance in the discharge reference section and the time of the discharge reference section, the interpolation unit 115 calculates the increase value of the cumulative driving distance per unit time (the slope of the cumulative driving distance). Based on the time slope of the SOC and the slope of the cumulative driving distance in the discharge reference section, the interpolation unit 115 calculates the reduction value of the SOC per unit distance (e.g., 1 km) (the distance slope of the SOC).

[0058] Based on the cumulative driving distance at the moment immediately before the start of the missing section, the distance slope of the SOC, and the cumulative driving distance at the moment immediately after the end of the missing section, the interpolation unit 115 calculates the discharge end time within the missing section. Based on the time when the SOC in the discharge reference section becomes the maximum value, the discharge end time within the missing section, the maximum value of the SOC, and the time slope of the SOC, the interpolation unit 115 calculates the SOC at the discharge end time within the missing section. Based on the SOC at the discharge end time within the missing section, the time from the start time of the missing section to the discharge end time within the missing section, and the time slope of the SOC, the interpolation unit 115 calculates the SOC at the start time of the missing section.

[0059] The interpolation unit 115 divides the discharge amount corresponding to the difference between the SOC at the start time of the missing section and the SOC at the discharge end time within the missing section by the time from the start time of the missing section to the discharge end time within the missing section to calculate the estimated value of the discharge current.

[0060] As the battery data at each moment from the start time of the missing section to the discharge end time within the missing section, the interpolation unit 115 interpolates the estimated value of the discharge current (dashed line). As the battery data at each moment from the discharge end time within the missing section to the end time of the missing section, the interpolation unit 115 interpolates 0 (dashed line). In addition, the interpolation unit 115 may also interpolate the cumulative driving distance from the start time of the missing section to the discharge end time within the missing section based on the slope of the cumulative driving distance in the discharge reference section.

[0061] Figure 4 It is a diagram showing a second specific example of the first interpolation method. The interpolation method selection unit 114 confirms the operating states of the secondary battery 21 before and after the missing section. Figure 4 In the example shown, the operating state of the secondary battery 21 before the missing section is the rest state, and the operating state of the secondary battery 21 after the missing section is the discharge state. In this case, the interpolation method selection unit 114 selects the following second interpolation algorithm.

[0062] During the discharge period after the missing section, the interpolation unit 115 determines the time when the SOC becomes the minimum value within a specified period (e.g., 6 hours) in the future direction from the end time of the missing section. The interpolation unit 115 sets the range from the time when the SOC becomes the minimum value to the end time of the missing section as the discharge reference section.

[0063] The interpolation unit 115 calculates the reduction value of the SOC in the discharge reference section. The interpolation unit 115 calculates the time slope of the SOC based on the reduction value of the SOC in the discharge reference section and the time of the discharge reference section. The interpolation unit 115 calculates the slope of the cumulative driving distance based on the increase value of the cumulative driving distance in the discharge reference section and the time of the discharge reference section. The interpolation unit 115 calculates the distance slope of the SOC based on the time slope of the SOC and the slope of the cumulative driving distance in the discharge reference section.

[0064] The interpolation unit 115 calculates the discharge start time in the missing section based on the cumulative driving distance at the moment immediately after the end of the missing section, the distance slope of the SOC, and the cumulative driving distance at the moment immediately before the start of the missing section. The interpolation unit 115 calculates the SOC at the discharge start time in the missing section based on the time when the SOC becomes the minimum value in the discharge reference section, the discharge start time in the missing section, the minimum value of the SOC, and the time slope of the SOC. The interpolation unit 115 calculates the SOC at the end time of the missing section based on the SOC at the discharge start time in the missing section, the time from the discharge start time in the missing section to the end time of the missing section, and the time slope of the SOC.

[0065] The interpolation unit 115 divides the discharge amount corresponding to the difference between the SOC at the discharge start time in the missing section and the SOC at the end time of the missing section by the time from the discharge start time in the missing section to the end time of the missing section to calculate the estimated value of the discharge current. In addition, the interpolation unit 115 can also simply divide the discharge amount corresponding to the difference between the SOC at the moment immediately before the start of the missing section and the SOC at the moment immediately after the end of the missing section included in the battery data by the time from the discharge start time in the missing section to the end time of the missing section to calculate the estimated value of the discharge current.

[0066] As the battery data at each moment from the discharge start time in the missing section to the end time of the missing section, the interpolation unit 115 interpolates the estimated value of the discharge current (dotted line). As the battery data at each moment from the start time of the missing section to the discharge start time in the missing section, the interpolation unit 115 interpolates 0 (dotted line). In addition, the interpolation unit 115 can also interpolate the cumulative driving distance from the discharge start time in the missing section to the end time of the missing section based on the slope of the cumulative driving distance in the discharge reference section.

[0067] Figure 5 It is a diagram showing the third specific example of the first interpolation method. The interpolation method selection unit 114 confirms the operation states of the secondary battery 21 before and after the defective section. Figure 5 In the example shown, the operation state of the secondary battery 21 before the defective section is the discharging state, and the operation state of the secondary battery 21 after the defective section is also the discharging state. In this case, the interpolation method selection unit 114 selects the following third interpolation algorithm.

[0068] The interpolation unit 115 calculates the estimated value of the discharge current by dividing the discharge amount corresponding to the difference in SOC between the moment immediately before the start of the defective section and the moment immediately after the end of the defective section by the time of the defective section. As the battery data for each moment from the start time of the defective section to the end time of the defective section, the interpolation unit 115 interpolates the estimated value of the discharge current (dashed line). In addition, the interpolation unit 115 can also simply divide the discharge amount corresponding to the difference in SOC between the moment immediately before the start of the defective section and the moment immediately after the end of the defective section included in the battery data by the time from the start time of the defective section to the discharge end time within the defective section to calculate the estimated value of the discharge current. Additionally, the discharge current can be estimated based on the average current value of the discharge reference section, or the discharge current can be estimated using machine learning or the like based on past driving data.

[0069] In addition, the interpolation method selection unit 114 can also select the first interpolation algorithm instead of the third interpolation algorithm. When the first interpolation algorithm is applied in the third specific example, it is not necessary to calculate the discharge end time within the defective section. The interpolation unit 115 calculates the SOC at the end time of the defective section based on the time when the SOC of the discharge reference section becomes the maximum value, the end time of the defective section, the maximum value of this SOC, and the time slope of the SOC. The interpolation unit 115 calculates the SOC at the start time of the defective section based on the SOC at the end time of the defective section, the time of the defective section, and the time slope of the SOC. The subsequent processing is the same as that in the first specific example.

[0070] In addition, the interpolation method selection unit 114 can also select the second interpolation algorithm. When the second interpolation algorithm is applied in the third specific example, it is not necessary to calculate the discharge start time within the defective section. The interpolation unit 115 calculates the SOC at the start time of the defective section based on the time when the SOC of the discharge reference section becomes the minimum value, the start time of the defective section, the minimum value of this SOC, and the time slope of the SOC. The interpolation unit 115 calculates the SOC at the end time of the defective section based on the SOC at the start time of the defective section, the time of the defective section, and the time slope of the SOC. The subsequent processing is the same as that in the second specific example.

[0071] Figure 6It is a flowchart showing the basic operation process of the data interpolation system 10 according to the embodiment. The data acquisition unit 111 acquires battery data and vehicle data from the electric vehicle 20 or the charging station 30 (S10). The operation state determination unit 112 determines the operation state of the secondary battery 21 and the operation state of the electric vehicle 20 at each sampling time based on the battery data and the vehicle data (S20). The defect determination unit 113 determines whether there is a defect interval in the current data included in the battery data (S30). When there is a defect interval in the current data (Yes in S30), the interpolation method selection unit 114 and the interpolation unit 115 perform data interpolation processing for the defect interval (S40). When there is no defect interval in the current data (No in S30), the interpolation processing in step S40 is skipped.

[0072] Figure 7 An example of the interpolation process of the first interpolation method of the data interpolation system 10 according to the embodiment. In Figure 7 In the flowchart of the subroutine shown, it is premised that the operation state of the electric vehicle 20 is a non-idle state. The interpolation method selection unit 114 determines whether the state of the secondary battery 21 after the defect interval is state A (S41). When the state of the secondary battery 21 after the defect interval is state A (Yes in S41), the interpolation method selection unit 114 determines whether the state of the secondary battery 21 before the defect interval is state A (S42).

[0073] When the state of the secondary battery 21 before the defect interval and the state of the secondary battery 21 after the defect interval are state A (Yes in S42), the interpolation method selection unit 114 selects a method of interpolating based on the battery data before and after the defect interval. When state A is a discharging state, the interpolation unit 115 refers to the battery data before and after the defect interval and linearly interpolates the battery data of the defect interval based on the battery data before and after it in a way that maintains the continuity of the discharging state before and after (S43). When state A is a charging state, the interpolation unit 115 refers to the battery data before and after the defect interval and linearly interpolates the battery data of the defect interval based on the battery data before and after it in a way that maintains the continuity of the charging state before and after (S43).

[0074] When the state of the secondary battery 21 before the defective section is not state A and the state of the secondary battery 21 after the defective section is state A (No in S42), the interpolation method selection unit 114 selects a method of interpolating based on the battery data after the defective section. When state A is a discharging state and the state changes from a resting state to a discharging state before and after the defective section, the interpolation unit 115 refers to the battery data after the defective section and interpolates the battery data of the defective section based on the subsequent battery data in a manner that maintains the continuity with the subsequent discharging state (S44). When state A is a charging state and the state changes from a resting state to a charging state before and after the defective section, the interpolation unit 115 refers to the battery data after the defective section and interpolates the battery data of the defective section based on the subsequent battery data in a manner that maintains the continuity with the subsequent charging state (S44).

[0075] When the state of the secondary battery 21 after the defective section is not state A (No in S41), the interpolation method selection unit 114 determines whether the state of the secondary battery 21 before the defective section is state A (S45). When the state of the secondary battery 21 before the defective section is state A and the state of the secondary battery 21 after the defective section is not state A (Yes in S45), the interpolation method selection unit 114 selects a method of interpolating based on the battery data before the defective section. When state A is a discharging state and the state changes from a discharging state to a resting state before and after the defective section, the interpolation unit 115 refers to the battery data before the defective section and interpolates the battery data of the defective section based on the preceding battery data in a manner that maintains the continuity with the previous discharging state (S46). When state A is a charging state and the state changes from a charging state to a resting state before and after the defective section, the interpolation unit 115 refers to the battery data before the defective section and interpolates the battery data of the defective section based on the preceding battery data in a manner that maintains the continuity with the previous charging state (S46).

[0076] When the state of the secondary battery 21 before the defective section and the state of the secondary battery 21 after the defective section are not state A (No in S45), the battery data of the defective section is skipped from the interpolation process regardless of the discharging state or the charging state.

[0077] In addition, in step S42, when the state of the secondary battery 21 before the defective section and the state of the secondary battery 21 after the defective section are state A (Yes in S42), the interpolation method selection unit 114 may also select a method of interpolating based on the battery data before the defective section. In this case, the interpolation unit 115 refers to the battery data before the defective section and interpolates the battery data of the defective section based on the preceding battery data in a manner that maintains the continuity with the previous state A.

[0078] In addition, when the operating state of the electric vehicle 20 is the rest state and at least one of the secondary batteries 21 before and after the defective section is in the discharge state, the interpolation method selection unit 114 skips the interpolation process. When changing from the rest state to the charging state before and after the defective section, the interpolation unit 115 refers to the battery data after the defective section and interpolates the battery data of the defective section based on the subsequent battery data in a manner that maintains the continuity with the subsequent charging state. When changing from the charging state to the rest state before and after the defective section, the interpolation unit 115 refers to the battery data before the defective section and interpolates the battery data of the defective section based on the preceding battery data in a manner that maintains the continuity with the preceding charging state.

[0079] When the states of the secondary batteries 21 before and after the defective section are both in the charging state, the interpolation unit 115 refers to the battery data before and after the defective section and linearly interpolates the battery data of the defective section based on the battery data before and after in a manner that maintains the continuity with the charging states before and after. In addition, the interpolation unit 115 may also refer to the battery data before the defective section and interpolate the battery data of the defective section based on the preceding battery data in a manner that maintains the continuity with the preceding charging state.

[0080] Next, the second interpolation method will be described. The second interpolation method is an interpolation method effective when the state of at least one of the secondary batteries 21 before and after the defective section is in the charging state. In particular, it is an interpolation method effective when the states of the secondary batteries 21 before and after the defective section are in the charging state.

[0081] In the second interpolation method, when at least one of the front and rear of the defective section is in the charging state, the interpolation unit 115 interpolates the current data of the defective section so that the discharge amount during the charge-discharge period from the SOC of the charging state immediately after the defective section to the SOC corresponding to the SOC in the past direction is corresponding to the charge amount. Or, when at least one of the front and rear of the defective section is in the charging state, the interpolation unit 115 interpolates the current data of the defective section so that the discharge amount during the charge-discharge period from the SOC of the charging state immediately before the defective section to the SOC corresponding to the SOC in the future direction is corresponding to the charge amount.

[0082] The validity determination unit 116 determines the validity of the interpolation process based on the charge amount or charge time of the defective section based on the capacity difference between the discharge amount and the charge amount calculated from the battery data included in the charge-discharge period.

[0083] Figure 8This is a diagram showing the first specific example of the second interpolation method. In the second interpolation method, the state of charge of the secondary battery 21 is set to the state of charge during parking and charging of the electric vehicle 20. The interpolation method selection unit 114 confirms the operating states of the secondary battery 21 before and after the missing section. Figure 8 In the example shown, the operating state of the secondary battery 21 before the missing section is the charging state, and the operating state of the secondary battery 21 after the missing section is also the charging state. In this case, the interpolation method selection unit 114 selects the following fourth interpolation algorithm.

[0084] The interpolation unit 115 determines, in the past direction from the end time of the missing section, the time closest to the end time of the missing section at which the SOC at the moment immediately after the end of the missing section becomes the same SOC. The interpolation unit 115 sets the range from the closest time at which the same SOC is reached to the end time of the missing section as the charge and discharge reference section. The interpolation unit 115 accumulates the positive current values within the charge and discharge reference section to calculate the cumulative discharge amount (1), and accumulates the negative current values within the charge and discharge reference section to calculate the cumulative charge amount (2). The interpolation unit 115 subtracts the cumulative charge amount (2) from the cumulative discharge amount (1) to calculate the missing charge amount (3).

[0085] The interpolation unit 115 determines the maximum value (4) of the charging current (the minimum value as current data) within the range of a specified period (e.g., 24 hours) in the future direction from the end time of the missing section. In addition, the interpolation unit 115 may also determine the maximum value (4) of the charging current within the charge and discharge reference section. Further, the interpolation unit 115 may also determine the maximum value (4) of the charging current within both the charge and discharge reference section and the range of a specified period in the future direction from the end time of the missing section.

[0086] The interpolation unit 115 divides the missing charge amount (3) by the time of the missing section to calculate the estimated value (5) of the charging current for the missing section. As the current data for each moment from the start time to the end time of the missing section, the interpolation unit 115 interpolates the estimated value (5) of the charging current (dashed line).

[0087] Figure 9 This is a diagram showing the second specific example of the second interpolation method. The interpolation method selection unit 114 confirms the operating states of the secondary battery 21 before and after the missing section. Figure 9 In the example shown, the operating state of the secondary battery 21 before the missing section is the discharging state, and the operating state of the secondary battery 21 after the missing section is the charging state. In this case, the interpolation method selection unit 114 selects the following fifth interpolation algorithm.

[0088] The interpolation unit 115 determines the moment closest to the end moment of the missing section in the past direction from the end moment of the missing section, at which the SOC at the moment immediately after the end of the missing section becomes the same SOC. The interpolation unit 115 sets the range from the closest moment with the same SOC to the end moment of the missing section as the charge / discharge reference section. The interpolation unit 115 accumulates the positive current values within the charge / discharge reference section to calculate the accumulated discharge amount (1). In the second specific example, the accumulated charge amount (2) within the charge / discharge reference section is 0.

[0089] The interpolation unit 115 determines the maximum value of the charging current (4) (the minimum value as current data) within the range of a specified period (e.g., 24 hours) in the future direction from the end moment of the missing section. In addition, the interpolation unit 115 may also determine the maximum value of the charging current (4) within the charge / discharge reference section. Additionally, the interpolation unit 115 may also determine the maximum value of the charging current (4) within both the charge / discharge reference section and the range of the specified period in the future direction from the end moment of the missing section.

[0090] The interpolation unit 115 divides the missing charge amount (= accumulated discharge amount (1) - 0) by the maximum value of the charging current (4) to calculate the charging time within the missing section. The interpolation unit 115 sets the moment that is the charging start moment within the missing section by tracing back the charging time within the missing section in the past direction from the end moment of the missing section. As the battery data for each moment from the charging start moment within the missing section to the end moment of the missing section, the interpolation unit 115 interpolates the maximum value of the charging current (4) (dashed line). As the battery data for each moment from the start moment within the missing section to the charging start moment within the missing section, the interpolation unit 115 interpolates 0 (dashed line).

[0091] Figure 10 It is a diagram showing the third specific example of the second interpolation method. The interpolation method selection unit 114 confirms the operation states of the secondary battery 21 before and after the missing section. Figure 10 In the shown example, the operation state of the secondary battery 21 before the missing section is the charging state, and the operation state of the secondary battery 21 after the missing section is the discharging state. In this case, the interpolation method selection unit 114 selects the following sixth interpolation algorithm.

[0092] The interpolation unit 115 determines the moment closest to the start moment of the missing section in the future direction at which the SOC at the moment immediately before the start of the missing section becomes the same SOC. The interpolation unit 115 sets the range from the moment closest to the start moment of the missing section at which the SOC becomes the same to the start moment of the missing section as the charge / discharge reference period. The interpolation unit 115 accumulates positive current values within the charge / discharge reference period to calculate the accumulated discharge amount (1). In the third specific example, the accumulated charge amount (2) within the charge / discharge reference period is 0.

[0093] The interpolation unit 115 determines the maximum value (4) of the charging current (the minimum value as current data) within a specified period (e.g., 24 hours) in the past direction from the start moment of the missing section. In addition, the interpolation unit 115 may determine the maximum value (4) of the charging current within the charge / discharge reference period. Further, the interpolation unit 115 may determine the maximum value (4) of the charging current within both the charge / discharge reference period and the specified period in the past direction from the start moment of the missing section.

[0094] The interpolation unit 115 divides the missing charge amount (= accumulated discharge amount (1) - 0) by the maximum value (4) of the charging current to calculate the charging time within the missing section. The interpolation unit 115 sets the moment advanced by the charging time within the missing section in the future direction from the start moment of the missing section as the charging end moment within the missing section. As the battery data for each moment from the start moment of the missing section to the charging end moment within the missing section, the interpolation unit 115 interpolates the maximum value (4) of the charging current (dashed line). As the battery data for each moment from the charging end moment within the missing section to the end moment of the missing section, the interpolation unit 115 interpolates 0 (dashed line).

[0095] Figure 11 An interpolation processing example showing the second interpolation method of the data interpolation system 10 according to the embodiment. The interpolation method selection unit 114 determines whether the state of the secondary battery 21 after the missing section is a charging state (S410). When the state of the secondary battery 21 after the missing section is a charging state (Yes in S410), the interpolation method selection unit 114 determines whether the state of the secondary battery 21 before the missing section is a charging state (S411).

[0096] When the state of the secondary battery 21 before the missing section and the state of the secondary battery 21 after the missing section are in a charging state (Yes in S411), the interpolation unit 115 sets the range from the SOC at the moment immediately after the end of the missing section to the same SOC in the past direction as one cycle of the charge / discharge reference period. The interpolation unit 115 obtains the maximum value (4) of the charging current from within one cycle of the charge / discharge reference period (S412). In Figure 11In the flowchart, the maximum value (4) of the charging current is an absolute value.

[0097] The interpolation unit 115 calculates the missing charge amount (3) by subtracting the cumulative charge amount (2) from the cumulative discharge amount (1) within the charge-discharge reference period (S413). The interpolation unit 115 divides the missing charge amount (3) by the time of the missing period to calculate the estimated value (5) of the charging current (S414). In Figure 11 the flowchart, the estimated value (5) of the charging current is an absolute value.

[0098] The validity determination unit 116 compares the estimated value (5) of the charging current with the maximum value (4) of the charging current (S415). When the estimated value (5) of the charging current is less than or equal to the maximum value (4) of the charging current (Yes in S415), the interpolation unit 115 interpolates the estimated value (5) of the charging current for the missing period (S416). When the estimated value (5) of the charging current exceeds the maximum value (4) of the charging current (No in S415), the validity determination unit 116 determines that the interpolation current value is inappropriate and skips the interpolation process.

[0099] When the state of the secondary battery 21 before the missing period is a discharge state or a rest state and the state of the secondary battery 21 after the missing period is a charge state (No in S411), the interpolation unit 115 sets the range from the SOC at the moment immediately after the end of the missing period to the SOC that becomes the same in the past direction as one cycle of the charge-discharge reference period. The interpolation unit 115 obtains the maximum value (4) of the charging current from within one cycle of the charge-discharge reference period (S417).

[0100] The interpolation unit 115 calculates the missing charge amount (3) by subtracting the cumulative charge amount (2) from the cumulative discharge amount (1) within the charge-discharge reference period (S418). The interpolation unit 115 divides the missing charge amount (3) by the maximum value (4) of the charging current to calculate the charging time within the missing period (S419).

[0101] The validity determination unit 116 compares the charging time within the missing period with the time of the entire missing period (S420). When the charging time within the missing period is less than or equal to the time of the entire missing period (Yes in S420), the interpolation unit 115 interpolates the maximum value (4) of the charging current for the charging period of the missing period (S421). When the charging time within the missing period exceeds the time of the entire missing period (No in S420), the validity determination unit 116 determines that the charging time within the missing period is inappropriate and skips the interpolation process.

[0102] When the state of the secondary battery 21 after the missing period is not the charging state (No in S410), the interpolation method selection unit 114 determines whether the state of the secondary battery 21 before the missing period is the charging state (S421). When the state of the secondary battery 21 before the missing period is the discharging state or the rest state and the state of the secondary battery 21 after the missing period is the charging state (Yes in S421), the interpolation unit 115 sets the range from the SOC at the moment immediately before the start of the missing period to the SOC that becomes the same in the future direction as one cycle of charge-discharge reference period. The interpolation unit 115 obtains the maximum value of the charging current (4) from within one cycle of charge-discharge reference period (S422).

[0103] The interpolation unit 115 calculates the missing charge amount (3) by subtracting the cumulative charge amount (2) from the cumulative discharge amount (1) within the charge-discharge reference interval (S423). The interpolation unit 115 divides the missing charge amount (3) by the maximum value of the charging current (4) to calculate the charging time within the missing period (S424).

[0104] The validity determination unit 116 compares the charging time within the missing period with the time of the entire missing period (S425). When the charging time within the missing period is less than or equal to the time of the entire missing period (Yes in S425), the interpolation unit 115 interpolates the maximum value of the charging current (4) for the charging interval of the missing period (S426). When the charging time within the missing period exceeds the time of the entire missing period (No in S425), the validity determination unit 116 determines that the charging time within the missing period is inappropriate and skips the interpolation process.

[0105] When the states of the secondary battery 21 before the missing period and after the missing period are not the charging state (No in S421), the battery data of the missing period is independent of the charging state, and the interpolation process is skipped.

[0106] In the above steps S413, S418, and S423, when the calculated cumulative discharge amount (1) or cumulative charge amount (2) within the charge-discharge reference interval exceeds the rated capacity of the secondary battery 21, the validity determination unit 116 may also determine that the interpolation process is inappropriate and skip the subsequent interpolation process. The rated capacity of the secondary battery 21 is the current full charge capacity, and the current full charge capacity is calculated by multiplying the initial full charge capacity by the SOH (State Of Health).

[0107] Figure 12 (a) - (b) are diagrams showing examples of estimating the SOC of the missing period. Figure 12(a) The example shown is an example of charge and discharge where the defective section includes two cycles. In the above-described second interpolation method, the defective section is recognized as one cycle of charge and discharge. Therefore, as shown in Figure 12 (b), the transition of the SOC due to the charge and discharge of the defective section is recognized. In this case, due to the discharge in the defective section, the SOC becomes less than 0%. In this case, it becomes an inappropriate interpolation process. By comparing the discharge amount or charge amount within the charge and discharge reference section with the rated capacity of the secondary battery 21, inappropriate interpolation processing can be avoided.

[0108] In the above steps S413, S418, and S423, when the cumulative charge amount (2) within the calculated charge and discharge reference section exceeds the cumulative discharge amount (1), the validity determination unit 116 may also determine the interpolation process as inappropriate and skip the subsequent interpolation process.

[0109] In the above description, the interpolation method selection unit 114 may first interpolate the current data of the discharge state in the defective section using the first interpolation method, and then interpolate the current data of the charge state in the defective section using the second interpolation method.

[0110] According to the present embodiment described above, by accurately interpolating the defective section of the battery data, the usefulness of the battery data can be improved. In the first interpolation method, by changing the interpolation method according to the operation state of the electric vehicle 20, inappropriate interpolation can be avoided, and the accuracy of the interpolated data can be improved.

[0111] In the second interpolation method, since the SOC is relatively used, the SOC error and the influence of the rated capacity caused by the deterioration of the secondary battery 21 can be eliminated. Specifically, the shape of the SOC-OCV curve of the secondary battery 21 changes due to deterioration. In the method of calculating the difference in SOC based on the OCV measured at the moment immediately before the start of the defective section and the moment immediately after the end, and multiplying the difference in SOC by the rated capacity of the secondary battery 21 to calculate the charge amount in the defective section, the error caused by the influence of the SOC error and the rated capacity becomes large.

[0112] In addition, the current sensor 23 has a measurement error, and the measurement error is also accumulated in the charge amount obtained by accumulating the current. The longer the data period, the greater the measurement error. Regarding this point, in the second interpolation method, by using the capacity difference between the discharge amount and the charge amount in the charge and discharge reference section, the measurement errors of discharge and charge can be canceled. The measurement error becomes an error corresponding only to the defective section.

[0113] In particular, when the states of the secondary battery 21 before and after the defective section are in a charged state, by selecting the second interpolation method, interpolation can be performed with high precision. In addition, by determining the appropriateness of the interpolated charging current value, it is possible to avoid performing interpolation processing with low precision and ensure the precision of the interpolation processing.

[0114] As described above, the present disclosure has been described based on the embodiments. Those skilled in the art should understand that the embodiments are merely examples, and various variations are possible in the combination of each constituent element and each processing procedure, and such variations are also within the scope of the present disclosure.

[0115] The above-described data interpolation system 10 may also be installed in the control unit 25 of the electric vehicle 20 or the control unit 32 of the charging station 30.

[0116] In the above embodiment, as the electric vehicle 20, a four-wheeled electric vehicle is assumed. In this regard, it may also be an electric motorcycle (electric two-wheeler), an electric bicycle, or an electric scooter. In addition, the electric vehicle includes not only full-standard electric vehicles but also low-speed electric vehicles such as golf carts and land vehicles. In addition, the device equipped with the secondary battery 21 is not limited to the electric vehicle 20. Devices equipped with the secondary battery 21 also include electric moving bodies such as electric ships, railway vehicles, and multi-rotor aircraft (drones), fixed-type energy storage systems, and civilian electronic devices (smartphones, laptop PCs, etc.). In addition, when the secondary battery 21 is mounted on a fixed-type energy storage system or a civilian electronic device, the operating state of the device does not include a regenerative charging state.

[0117] In addition, the embodiments may also be specified by the following items.

[0118] [Item 1]

[0119] A data interpolation system (10), comprising:

[0120] A data acquisition unit (111) that acquires device data related to the operation of a device (20) equipped with a battery (21) and battery data of the battery (21) including at least time-series data of current,

[0121] An operation state determination unit (112) that determines the operation state of the device (20) and the operation state of the battery (21) at each moment based on the device data and the battery data,

[0122] A defect determination unit (113) that determines whether a defective section is included in the battery data,

[0123] An interpolation method selection unit (114) that selects an interpolation method for battery data in the missing section based on the operation state of the device (20) and the operation state of the battery (21), and

[0124] An interpolation unit (115) that uses the selected interpolation method to interpolate the battery data in the missing section based on at least the battery data outside the missing section.

[0125] Thereby, it is possible to interpolate the missing section of the battery data with high accuracy.

[0126] [Item 2]

[0127] The data interpolation system (10) described in Item 1, characterized in that

[0128] The operation state of the device (20) includes at least an operating state and a stopped state;

[0129] The operation state of the battery (21) includes at least a charging state, a discharging state, and a rest state;

[0130] The interpolation method selection unit (114) selects an interpolation method based on the combination of state changes before and after the missing section.

[0131] Thereby, it is possible to select the best interpolation method.

[0132] [Item 3]

[0133] The data interpolation system (10) described in Item 2, characterized in that

[0134] When the device (20) is in the operating state,

[0135] The interpolation method selection unit (114)

[0136] When the state of the battery (21) changes from the discharging state to the rest state before and after the missing section, or when the state of the battery (21) before and after the missing section is the discharging state, selects an interpolation method that interpolates based on the battery data in front to maintain the continuity of the battery data in the missing section with the previous discharging state,

[0137] When the state of the battery (21) changes from the rest state to the discharging state before and after the missing section, selects an interpolation method that interpolates based on the battery data behind to maintain the continuity of the battery data in the missing section with the subsequent discharging state,

[0138] When the state of the battery (21) changes from the charging state to the rest state before and after the defective section, or when the state of the battery (21) before and after the defective section is the charging state, an interpolation method that interpolates based on the battery data ahead is selected to maintain the continuity of the battery data in the defective section with the previous charging state.

[0139] When the state of the battery (21) changes from the rest state to the charging state before and after the defective section, an interpolation method that interpolates based on the battery data behind is selected to maintain the continuity of the battery data in the defective section with the subsequent charging state.

[0140] Thereby, the interpolation accuracy can be improved.

[0141] [Item 4]

[0142] The data interpolation system (10) as described in Item 2, characterized in that

[0143] when the device (20) is in the rest state,

[0144] the interpolation method selection unit (114)

[0145] When the state of the battery (21) changes from the charging state to the rest state before and after the defective section, or when the state of the battery (21) before and after the defective section remains in the charging state, an interpolation method that interpolates based on the battery data ahead is selected to maintain the continuity of the battery data in the defective section with the previous charging state.

[0146] When the state of the battery (21) changes from the rest state to the charging state before and after the defective section, an interpolation method that interpolates based on the battery data behind is selected to maintain the continuity of the battery data in the defective section with the subsequent charging state.

[0147] When the state of at least one of the batteries (21) before and after the defective section is the discharging state, the interpolation process is skipped.

[0148] Thereby, the interpolation accuracy can be improved.

[0149] [Item 5]

[0150] The data interpolation system (10) as described in Item 1, characterized in that

[0151] The interpolation unit (115) interpolates the battery data in the defective section based on the device data and the battery data.

[0152] Thereby, the interpolation accuracy can be improved.

[0153] [Item 6]

[0154] The data interpolation system (10) described in Item 1, wherein

[0155] the device (20) is an electric vehicle (20);

[0156] the device data includes at least one of vehicle speed and cumulative driving distance.

[0157] Thereby, the operation state of the device (20) can be determined with high precision.

[0158] [Item 7]

[0159] The data interpolation system (10) described in Item 6, wherein

[0160] when the change amount of continuous data exceeds a specified threshold value, the defect determination unit (113) determines a defect section that does not satisfy the specified sampling interval.

[0161] Thereby, the defect section can be detected with high precision.

[0162] [Item 8]

[0163] The data interpolation system (10) described in Item 6, wherein

[0164] the defect determination unit (113) determines whether a defect section is included in the device data of the electric vehicle (20);

[0165] the interpolation method selection unit (114) selects an interpolation method for the device data of the defect section according to the operation state of the electric vehicle and the operation state of the battery (21);

[0166] the interpolation unit (115) uses the selected interpolation method to interpolate the device data of the defect section based on at least the device data outside the defect section.

[0167] The device data may also be the cumulative driving distance of the electric vehicle (20).

[0168] Thereby, the defect section of the device data can be interpolated with high precision.

[0169] [Item 9]

[0170] A data interpolation method, characterized by comprising:

[0171] a step of obtaining device data related to the operation of the device (20) equipped with the battery (21) and battery data of the battery (21) including at least time series data of current

[0172] A step of determining the operation state of the device (20) and the operation state of the battery (21) at each moment based on the device data and the battery data

[0173] A step of determining whether the battery data contains a missing section

[0174] A step of selecting an interpolation method for the battery data in the missing section according to the operation state of the device (20) and the operation state of the battery (21), and

[0175] A step of interpolating the battery data in the missing section using the selected interpolation method based at least on the battery data outside the missing section

[0176] Thereby, the missing section of the battery data can be interpolated with high precision

[0177] [Item 10]

[0178] A data interpolation method, characterized in that a computer is caused to execute the following processing

[0179] A process of acquiring device data related to the operation of a device (20) equipped with a battery (21) and battery data of the battery (21) including at least time series data of current

[0180] A process of determining the operation state of the device (20) and the operation state of the battery (21) at each moment based on the device data and the battery data

[0181] A process of determining whether the battery data contains a missing section

[0182] A process of selecting an interpolation method for the battery data in the missing section according to the operation state of the device (20) and the operation state of the battery (21), and

[0183] A process of interpolating the battery data in the missing section using the selected interpolation method based at least on the battery data outside the missing section

[0184] Thereby, the missing section of the battery data can be interpolated with high precision

[0185] [Industrial Applicability]

[0186] The present disclosure can be used for a battery analysis system constructed on a cloud server

[0187] [Explanation of Reference Numerals]

[0188] 2 Commercial power system, 5 Network, 10 Data interpolation system, 11 Control unit, 12 Storage unit, 13 Communication unit, 20 Electric vehicle, 21 Secondary battery, 22 Voltage sensor, 23 Current sensor, 24 Temperature sensor, 25 Control unit, 26 Communication unit, 27 Vehicle speed sensor, 30 Charging station, 31 Power supply unit, 32 Control unit, 33 Communication unit, 111 Data acquisition unit, 112 Operating state determination unit, 113 Defect determination unit, 114 Interpolation method selection unit, 115 Interpolation unit, 116 Validity determination unit, 121 Battery data holding unit, 122 Vehicle data holding unit.

Claims

1. A data interpolation system, characterized in that, it comprises: a data acquisition unit that acquires device data related to the operation of a device equipped with a battery and battery data of the battery including at least time-series data of current, an operation state determination unit that determines the operation state of the device and the operation state of the battery at each moment based on the device data and the battery data, a defect determination unit that determines whether the battery data contains a defective section, an interpolation method selection unit that selects an interpolation method for the battery data of the defective section according to the operation state of the device and the operation state of the battery, and an interpolation unit that uses the selected interpolation method to interpolate the battery data of the defective section based at least on the battery data outside the defective section.

2. The data interpolation system according to claim 1, characterized in that, the operation state of the device at least includes an operating state and a stopped state; the operation state of the battery at least includes a charging state, a discharging state, and a rest state; the interpolation method selection unit selects an interpolation method according to the combination of state changes before and after the defective section.

3. The data interpolation system according to claim 2, characterized in that, when the device is in the operating state, the interpolation method selection unit when the state of the battery changes from the discharging state to the rest state before and after the defective section, or when the state of the battery before and after the defective section is the discharging state, selects an interpolation method that interpolates based on the battery data ahead to maintain the continuity of the battery data in the defective section with the previous discharging state, when the state of the battery changes from the rest state to the discharging state before and after the defective section, selects an interpolation method that interpolates based on the battery data behind to maintain the continuity of the battery data in the defective section with the subsequent discharging state, when the state of the battery changes from the charging state to the rest state before and after the defective section, or when the state of the battery before and after the defective section is the charging state, selects an interpolation method that interpolates based on the battery data ahead to maintain the continuity of the battery data in the defective section with the previous charging state, when the state of the battery changes from the rest state to the charging state before and after the defective section, selects an interpolation method that interpolates based on the battery data behind to maintain the continuity of the battery data in the defective section with the subsequent charging state.

4. The data interpolation system according to claim 2, characterized in that, when the device is in the rest state, the interpolation method selection unit when the state of the battery changes from the charging state to the rest state before and after the defective section, or when the state of the battery before and after the defective section continuously remains in the charging state, selects an interpolation method that interpolates based on the battery data ahead to maintain the continuity of the battery data in the defective section with the previous charging state, When the state of the battery changes from the rest state to the charging state before and after the defective section, an interpolation method that interpolates based on the battery data of the rear is selected so that the battery data in the defective section maintains continuity with the subsequent charging state. When the state of at least one of the batteries before and after the defective section is the discharging state, the interpolation process is skipped.

5. The data interpolation system according to claim 1, characterized in that, the interpolation unit interpolates the battery data in the defective section based on the device data and the battery data.

6. The data interpolation system according to claim 1, characterized in that, the device is an electric vehicle; the device data includes at least one of vehicle speed and cumulative driving distance.

7. The data interpolation system according to claim 6, characterized in that, when the change amount of continuous data exceeds a specified threshold, the defective section that does not satisfy the specified sampling interval is determined.

8. The data interpolation system according to claim 6, characterized in that, the defective section determination unit determines whether the device data of the electric vehicle includes a defective section; the interpolation method selection unit selects an interpolation method for the device data in the defective section according to the operation state of the electric vehicle and the operation state of the battery; the interpolation unit uses the selected interpolation method to interpolate the device data in the defective section based on at least the device data outside the defective section.

9. A data interpolation method, characterized in that, it has: a step of obtaining device data related to the operation of a device equipped with a battery and battery data of the battery including at least time series data of current, a step of determining the operation state of the device and the operation state of the battery at each moment based on the device data and the battery data, a step of determining whether the battery data includes a defective section, a step of selecting an interpolation method for the battery data in the defective section according to the operation state of the device and the operation state of the battery, and a step of interpolating the battery data in the defective section using the selected interpolation method based on at least the battery data outside the defective section.

10. A data interpolation method, characterized in that, causes a computer to execute the following processing: a process of obtaining device data related to the operation of a device equipped with a battery and battery data of the battery including at least time series data of current, a process of determining the operation state of the device and the operation state of the battery at each moment based on the device data and the battery data, a process of determining whether the battery data includes a defective section, a process of selecting an interpolation method for the battery data in the defective section according to the operation state of the device and the operation state of the battery, and a process of interpolating the battery data in the defective section using the selected interpolation method based on at least the battery data outside the defective section.

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