Computer program, determination device, and determination method

Abstract

To provide a computer programs, a determination device, and a determination method.SOLUTION: A computer program causes a computer to execute processing of estimating the state of at least one of a power storage device and a power management system, and determining the compatibility between the power storage device and the power management system on the basis of the estimated state of the power storage device by executing a simulation using a battery model that simulates the power storage device and a charge / discharge system model that simulates the power management system for the power storage device.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a computer program, a determination device, and a determination method. [Background technology]

[0002] 2. Description of the Related Art Vehicles such as EVs (Electric Vehicles) and HEVs (Hybrid Electric Vehicles) are equipped with batteries and charging / discharging systems for charging and discharging the batteries (see, for example, Patent Document 1).

[0003] Such a charging / discharging system acquires various information such as the battery temperature, SOC (State Of Charge), SOH (State Of Health), voltage, and current from a BMU (Battery Management Unit), and performs charging / discharging control based on the acquired information. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-062018 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the specifications of the charging / discharging system of the vehicle do not match the performance of the battery installed in the vehicle, the battery may not perform to its full potential or may accelerate battery deterioration. If such defects are found at the stage of actually installing the battery and performing comprehensive verification of the vehicle system, it may become necessary to review the specifications of the charging / discharging system or to change the type of battery installed in the vehicle, which creates the problem that it is not possible to reach an agreement on the specifications at an early stage.

[0006] An object of the present invention is to provide a computer program, a determination method, and a determination apparatus for determining compatibility between a charge / discharge system and an electricity storage device through a simulation. [Means for solving the problem]

[0007] The computer program causes a computer to execute a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device, thereby estimating a state of at least one of the power storage device and the power management system, and executing a process of determining compatibility between the power storage device and the power management system based on the estimated state of the power storage device.

[0008] The determination device includes an estimation unit that estimates a state of at least one of the power storage device and the power management system by performing a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device, and a determination unit that determines the compatibility between the power storage device and the power management system based on the estimated state of the power storage device.

[0009] The determination method involves using a computer to perform a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device, thereby estimating the state of at least one of the power storage device and the power management system, and determining the compatibility between the power storage device and the power management system based on the estimated state of the power storage device. Effect of the Invention

[0010] According to the present application, the compatibility between a charge / discharge system and an electricity storage device can be determined by simulation. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a block diagram illustrating a configuration of a control system in a vehicle. [Diagram 2] FIG. 2 is a block diagram showing an internal configuration of the power storage device. [Diagram 3] 1 is a block diagram illustrating an internal configuration of a development support device according to an embodiment of the present invention. [Figure 4] 2 is a block diagram showing a configuration of a simulation model used by the development support device; [Diagram 5] FIG. 13 is a schematic diagram showing an example of a parameter setting screen in a battery model. [Figure 6] FIG. 13 is a schematic diagram showing an example of a parameter setting screen in a charge / discharge system model. [Figure 7] 1 is a flowchart showing a procedure of a process executed by the development support device. [Figure 8] FIG. 13 is a schematic diagram showing a display example of a simulation execution result. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The computer program in the embodiment causes a computer to estimate a state of at least one of the power storage device and the power management system by performing a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device, and to perform a process of determining compatibility between the power storage device and the power management system based on the estimated state of the power storage device. When the internal structure is changed when designing an electricity storage device, or when the composition of the active material or electrolyte is changed, the characteristics of the battery change. When the characteristics of the battery change, it is necessary to change the charge / discharge control in accordance with the change in the characteristics. In an electricity storage device, overcharging and overdischarging must be avoided, and charge / discharge control is very important. When the compatibility between an electricity storage device and a power management system is determined by a simulation using a model as in this embodiment, a charging device that generates a high voltage in the charge control is not required, and safety is high. In this embodiment, the entire system of the power system including batteries such as 12V and 48V, regenerative power, solar power generation, 100V power source, power conditioner (power conditioner), and a storage system incorporating reused batteries is called a power management system. In addition, in verification using an actual device or prototype, it is necessary to charge and discharge the actual battery, so it takes time to obtain the compatibility determination result, but when it is determined by simulation, it is not necessary to charge and discharge the battery, so the compatibility determination result can be obtained quickly. Considering the remarkable progress being made in recent years in the development of electric vehicles, renewable energy, smart grids, and other fields, there are high expectations for high-performance, high-safety energy storage devices, and the significance of using simulation to design for safety and shorten development times is great.

[0013] In the computer program, the battery model may include a state estimation model for estimating at least one of the SOC, SOH, voltage, current, and temperature of the power storage device, a parts model for simulating components constituting the power storage device, a charge / discharge control model for simulating charge / discharge control for the power storage device, and an event estimation model for estimating at least one of deterioration and heat generation of the power storage device. When determining compatibility between a power storage device and a power management system in a verification using an actual machine or a prototype, it is necessary to repeatedly charge and discharge an actual battery by changing the setting value in the power management system in various ways, and it takes time to obtain a determination result. In addition, if a determination result indicating low compatibility is obtained, it is necessary to change the combination of the power storage device and the power management system and continue the verification, which takes even more time. In contrast, in this embodiment, the parameters of the power management system prepared as a model are changed in various ways to determine compatibility for various combinations of the power storage device and the power management system, so that a compatibility determination result can be obtained quickly. Furthermore, even if the judgement result indicates low compatibility, it is an effective development support tool because it makes clear which parts of the specifications need to be changed.

[0014] In the computer program, the charge / discharge system model may be a model including at least one of the efficiency, resistance, rotation speed, set voltage, and voltage control characteristic of the power management system as a parameter. In the case of judging the compatibility between the power storage device and the power management system in the verification using the actual machine or prototype, it is necessary to repeatedly charge and discharge the actual battery by changing the set value in the power management system in various ways, and it takes time to obtain the judgment result. In addition, if the judgment result that the compatibility is low is obtained, it is necessary to change the combination of the power storage device and the power management system and continue the verification, which takes more time. In contrast, in this embodiment, the parameters of the power management system prepared as a model are changed in various ways, so that the compatibility can be judged for various combinations of the power storage device and the power management system, and the judgment result of the compatibility can be obtained quickly. In addition, even if the judgment result that the compatibility is low is obtained, it is clear which part should be changed in the specifications, so it is an effective development support tool.

[0015] The computer program may cause the computer to execute a process of accepting input of parameters indicating an initial state of each model. With this configuration, since a simulation can be executed with any state of the power storage device and the power management system as the initial state, the time required to determine compatibility can be shortened compared to a verification method using an actual device or a prototype that requires charging and discharging an actual battery to determine compatibility.

[0016] The computer program may cause the computer to execute a process of displaying the estimation results of each model on a display device. With this configuration, for example, it is possible to display the time transition of parameters obtained by executing a simulation, so that when a result of the determination that the compatibility is low is obtained, it is possible to clarify which part of the specifications should be changed.

[0017] The determination device in the embodiment includes an estimation unit that estimates a state of at least one of the power storage device and the power management system by performing a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device, and a determination unit that determines the compatibility between the power storage device and the power management system based on the estimated state of the power storage device. When the internal structure is changed when designing an electricity storage device, or when the composition of the active material or electrolyte is changed, the characteristics of the battery change. When the characteristics of the battery change, it is necessary to change the charge / discharge control in accordance with the change in the characteristics. In an electricity storage device, overcharging and overdischarging must be avoided, and charge / discharge control is very important. When the compatibility between an electricity storage device and a power management system is determined by a simulation using a model, as in the determination device of this embodiment, a charging device that generates a high voltage in the charge control is not required, and safety is high. In this embodiment, the entire system of the power system including batteries such as 12V and 48V, regenerative power, solar power generation, 100V power source, power conditioner (power conditioner), and a storage system incorporating reused batteries is called a power management system. In addition, in verification using an actual machine or prototype, it is necessary to charge and discharge the actual battery, so it takes time to obtain the compatibility determination result, but when the determination is made by simulation using a determination device, it is not necessary to charge and discharge the battery, so the compatibility determination result can be obtained quickly. Considering the remarkable progress being made in recent years in the development of electric vehicles, renewable energy, smart grids, and other fields, there are high expectations for high-performance, high-safety energy storage devices, and the significance of using simulation to design for safety and shorten development times is great.

[0018] The determination method in one embodiment uses a computer to perform a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device, thereby estimating the state of at least one of the power storage device and the power management system, and determines the compatibility between the power storage device and the power management system based on the estimated state of the power storage device. When the internal structure is changed in designing the power storage device, or when the composition of the active material or electrolyte is changed, the characteristics of the battery change. When the characteristics of the battery change, it is necessary to change the charge / discharge control in accordance with the change in the characteristics. In the power storage device, overcharging and overdischarging must be avoided, and the importance of charge / discharge control is high. When the compatibility between the power storage device and the power management system is determined by a simulation using a model, as in the determination method of this embodiment, a charging device that generates a high voltage in the charge control is not required, and safety is high. In this embodiment, the entire system of the power system including batteries such as 12V and 48V, regenerative power, solar power generation, 100V power source, power conditioner (power conditioner), and a power storage system incorporating reused batteries is called a power management system. In addition, in verification using an actual machine or a prototype, it is necessary to charge and discharge the actual battery, so it takes time to obtain the compatibility determination result, but when it is determined by simulation using a computer, it is not necessary to charge and discharge the battery, so the compatibility determination result can be obtained quickly. Considering the remarkable progress being made in recent years in the development of electric vehicles, renewable energy, smart grids, and other fields, there are high expectations for high-performance, high-safety energy storage devices, and the significance of using simulation to design for safety and shorten development times is great.

[0019] Hereinafter, as an embodiment of the present invention, an application example to a charge / discharge system mounted on a vehicle such as a hybrid electric vehicle (HEV) or an electric vehicle (EV) will be described.

[0020] 1 is a block diagram illustrating the configuration of a control system in a vehicle. The vehicle C includes, as the control system configuration, an electricity storage device 10, a charging / discharging system 20 for charging the electricity storage device 10, and a vehicle ECU (Electronic Control Unit) 30 for executing control of the entire vehicle. The electricity storage device 10, the charging / discharging system 20, and the vehicle ECU 30 are connected to each other so as to be able to communicate with each other via an in-vehicle line such as a controller area network (CAN) or a local interconnect network (LIN). In this embodiment, the vehicle ECU 30 monitors the running state of the vehicle C, the charging state of the electricity storage device 10, and the like, and executes control for switching between charging and discharging the electricity storage device 10 according to the running state of the vehicle C and the charging state of the electricity storage device 10, and the like.

[0021] The power storage device 10 includes a power storage element 11 and a BMU 12 (Battery Management Unit) (see FIG. 2). The power storage element 11 is, for example, an assembled battery including a plurality of batteries connected in series. The power storage element 11 included in the power storage device 10 is charged with power supplied from a charging / discharging system 20 of the vehicle C, and supplies the power to a load in response to a control command from the vehicle ECU 30. An example of a load to which the power storage device 10 supplies power is an electric motor 23 that generates a driving torque for running the vehicle C. Other examples of the load include various accessories included in the vehicle C, such as headlights, turn signals, interior lights, and power windows. The BMU 12 has a function of managing the power storage device 10. The BMU 12 has a function of estimating the state of the power storage device 10, a function of detecting an abnormality in the power storage device 10, and the like, and notifies the vehicle ECU 30 of information on the estimated state (e.g., SOC) of the power storage device 10, information on the detected abnormality, and the like.

[0022] The charge / discharge system 20 includes a charge ECU 21, an alternator 22, and an electric motor 23. The alternator 22 is a generator connected to an output shaft of an engine (not shown) and is configured to generate power by the rotation of the output shaft. The power obtained by the power generation of the alternator 22 is supplied to the loads included in the power storage device 10 and the vehicle C under the control of the charge ECU 21. The alternator 22 performs regenerative control to generate power when the vehicle C is decelerating, thereby becoming a load against the rotation of the engine output shaft and applying a braking force to the vehicle C, and also supplies the generated power to the loads included in the power storage device 10 and the vehicle C.

[0023] 2 is a block diagram showing the internal configuration of the power storage device 10. In addition to a power storage element 11 and a BMU 12, the power storage device 10 includes a current sensor 13, a voltage sensor 14, a temperature sensor 15, and a relay 16. The power storage element 11 is composed of, for example, a plurality of lithium ion secondary batteries connected in series.

[0024] Current sensor 13 is provided between energy storage element 11 and negative terminal 10A, and measures the current flowing into energy storage element 11. Current sensor 13 outputs the measurement result to BMU 12.

[0025] The voltage sensor 14 is connected in parallel to the storage element 11, and measures the voltage across the storage element 11. The voltage sensor 14 outputs the measurement result to the BMU 12.

[0026] The temperature sensor 15 is provided inside or outside the power storage device 10 and measures the temperature. A plurality of temperature sensors 15 may be provided. The temperature measured by the temperature sensor 15 is, for example, the temperature of the power storage element 11. In this case, the temperature sensor 15 is provided near the power storage element 11 (inside the power storage device). The temperature measured by the temperature sensor 15 may be the temperature of the environment in which the power storage device 10 is installed (ambient temperature). In this case, the temperature sensor 15 is provided near the power storage device 10. In the following description, the temperature of the power storage element 11 and the ambient temperature will not be distinguished from each other and will be referred to as the temperature of the power storage device 10. The temperature sensor 15 outputs the measurement result to the BMU 12.

[0027] Relay 16 is provided between the energy storage element 11 and positive terminal 10B, and is a circuit element for disconnecting or connecting a charge / discharge path of the energy storage element 11 in response to a control command from BMU 12. When the energy storage device 10 is functioning normally, the charge / discharge path is connected, and charging of the energy storage element 11 from the outside and supply of power (discharging) from the energy storage element 11 to a load are possible. On the other hand, when any abnormality is detected in the energy storage device 10, the charge / discharge path is disconnected in response to a control command from BMU 12, and charging of the energy storage element 11 and supply of power (discharging) to the load are stopped. In the present embodiment, the relay 16 is an example of a circuit element for connecting or disconnecting a charge / discharge path. Alternatively, a semiconductor switch such as a field-effect transistor (FET) may be used to connect or disconnect the charge / discharge path.

[0028] The BMU 12 is a device for managing the state of the power storage device 10, and includes, for example, a control unit 121, a storage unit 122, a connection unit 123, and a communication unit 124. The control unit 121 includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like. The CPU included in the control unit 121 executes a control program stored in advance in the ROM to realize a function of estimating the state of the power storage device 10, a function of detecting an abnormality in the power storage device 10, and the like. The RAM temporarily stores various information generated during the execution of calculations by the CPU. The storage unit 122 is composed of an electronically erasable programmable read only memory (EEPROM) and the like, and stores data necessary for control and the like. The connection unit 123 is connected to the current sensor 13, the voltage sensor 14, the temperature sensor 15, the relay 16, and the like. The communication unit 124 is communicably connected to the vehicle ECU 30 via an in-vehicle line such as CAN or LIN.

[0029] The control unit 121 of the BMU 12 acquires the current value measured by the current sensor 13, the voltage value measured by the voltage sensor 14, and the temperature measured by the temperature sensor 15 through the connection unit 123, and calculates the target values ​​of the SOC and charging voltage of the power storage device 10 based on these data. The control unit 121 notifies the vehicle ECU 30 of the calculated SOC and target values ​​of the charging voltage through the communication unit 124. Furthermore, when the temperature measured by the temperature sensor 15 exceeds a preset threshold, for example, the control unit 121 determines that an abnormality in the power storage device 10 has been detected, and outputs a control command to the relay 16 to cut off the charge / discharge path.

[0030] In this embodiment, the power storage device 10 is configured to include the BMU 12. Alternatively, the BMU 12 may be provided outside the power storage device 10.

[0031] The charging / discharging system 20 mounted on the vehicle C is developed and manufactured, for example, by a vehicle manufacturer, and the electricity storage device 10 is developed and manufactured, for example, by a battery manufacturer. If the specifications of the charging / discharging system 20 mounted on the vehicle C do not match the performance of the electricity storage device 10 incorporated in the vehicle C, the battery performance may not be fully exhibited, or the deterioration of the battery may be accelerated. If the above-mentioned defects are found at the time when the electricity storage device 10 is incorporated in the vehicle C and the entire vehicle is comprehensively inspected, it may become necessary to review the specifications of the charging / discharging system 20 or to change the type of the electricity storage device 10 incorporated in the vehicle C, and therefore it is not possible to reach an agreement on the specifications in an early stage.

[0032] In this embodiment, a simulation is performed using a model simulating the energy storage device 10 and a model simulating the charging / discharging system 20 of the vehicle C in a computer independent of the vehicle C (the development support device 100 shown in FIG. 3), and compatibility between the energy storage device 10 mounted on the vehicle C and the charging / discharging system 20 equipped in the vehicle C is determined.

[0033] 3 is a block diagram illustrating the internal configuration of development support device 100 according to this embodiment. Development support device 100 is a general-purpose or dedicated computer, and includes control unit 101, storage unit 102, communication unit 103, operation unit 104, display unit 105, etc.

[0034] The control unit 101 is composed of a CPU, a ROM, a RAM, etc. The CPU included in the control unit 101 loads various computer programs stored in the ROM or the storage unit 102 onto the RAM and executes them, thereby causing the entire device to function as the determination device of the present application.

[0035] The control unit 101 is not limited to the above configuration, and may be any processing circuit or arithmetic circuit equipped with multiple CPUs, a multi-core CPU, a GPU (Graphics Processing Unit), a microcomputer, a volatile or non-volatile memory, etc. The control unit 101 may also have functions such as a timer that measures the elapsed time from when a measurement start instruction is given to when a measurement end instruction is given, a counter that counts numbers, and a clock that outputs date and time information.

[0036] The storage unit 102 includes a storage device using a hard disk drive (HDD), a solid state drive (SSD), etc. The storage unit 102 stores various computer programs executed by the control unit 101, data required for executing the computer programs, etc. The computer programs stored in the storage unit 102 include a determination program PG that estimates the behavior of the charge control for the power storage device 10 by using a battery model BM that simulates the power storage device 10 and a charge / discharge system model CSM that simulates the charge / discharge system 20 on the vehicle side, and determines the compatibility between the power storage device 10 and the charge / discharge system 20. The determination program PG may be a single computer program, or may be a group of programs configured from a plurality of programs.

[0037] The computer program stored in the storage unit 102 is provided, for example, by a non-transitory recording medium M on which the computer program is readably recorded. The recording medium M is a portable memory such as a CD-ROM, a Universal Serial Bus (USB) memory, a Secure Digital (SD) card, a micro SD card, or a Compact Flash (registered trademark). In this case, the control unit 101 may read the computer program from the recording medium M using a reading device (not shown), and install the read computer program in the storage unit 102. Alternatively, the computer program stored in the storage unit 102 may be provided by communication via the communication unit 103. In this case, the control unit 101 may obtain the computer program through the communication unit 103, and install the obtained computer program in the storage unit 102.

[0038] The storage unit 102 stores various data in addition to computer programs. For example, the storage unit 102 stores a battery model BM that simulates the power storage device 10. The battery model BM includes, for example, an equivalent circuit that represents the power storage element 11. The storage unit 102 stores information about the circuit configuration of the equivalent circuit, values ​​of each element that configures the equivalent circuit, and the like. The battery model BM may further include models that simulate components such as the BMU 12, the current sensor 13, the voltage sensor 14, the temperature sensor 15, and the relay 16 that are provided in the power storage device 10. The battery model BM may further include a model that simulates control executed by the power storage device 10, and a model that simulates events such as deterioration and heat generation of the power storage device 10.

[0039] Furthermore, the storage unit 102 stores a charge / discharge system model CSM that simulates the charge / discharge system 20 in the vehicle C. The charge / discharge system model CSM is described using control parameters including the efficiency, resistance, rotation speed, set voltage, and voltage control measurement of the charger / discharger (in this embodiment, the alternator 22 and the electric motor 23).

[0040] The storage unit 102 may have a battery table BT that stores information on the power storage device 10 in association with an identifier for identifying the power storage device 10. The battery information registered in the battery table BT includes, for example, information on the positive and negative electrodes, information on the electrolyte, and information on the tabs. The information on the positive and negative electrodes is information such as the names of the active materials of the positive and negative electrodes, thickness, width, depth, and open circuit potential. The information on the electrolyte and the tabs is information such as ion species, transport number, diffusion coefficient, and conductivity. The information registered in the battery table BT may also include information on components that configure the power storage device 10. The information stored in the battery table BT is used as a part of parameters when the above-mentioned simulation is performed.

[0041] The communication unit 103 includes a communication interface for communicating with an external device through a communication network (not shown). The external device is, for example, an information processing terminal such as a computer or a smartphone used by a user. When information to be transmitted to the external device is input from the control unit 101, the communication unit 103 transmits the input information to the external device and also outputs information received from the external device through the communication network to the control unit 101.

[0042] The communication unit 103 may be configured to be able to communicate with the vehicle ECU 30 and the BMU 12 included in the power storage device 10. The control unit 101 may acquire information on the running state of the vehicle C, various measurement values ​​measured by the power storage device 10, and the like through the communication unit 103, and perform a simulation based on the acquired information.

[0043] The operation unit 104 has an input interface such as a keyboard, a mouse, a touch panel, etc., and accepts operations by the user. The display unit 105 has a liquid crystal display device, etc., and displays information to be notified to the user. Note that, in this embodiment, the development support device 100 is configured to have the operation unit 104 and the display unit 105, but the operation unit 104 and the display unit 105 are not essential, and the development support device 100 may be configured to accept operations via a computer connected externally to the development support device 100 and output information to be notified to the external computer.

[0044] The configuration of the simulation model will now be described. 4 is a block diagram showing the configuration of a simulation model used by the development support device 100. The development support device 100 estimates the state of the power storage device 10 by executing a simulation using a battery model BM that simulates the power storage device 10 and a charge / discharge system model CSM that simulates the charge / discharge system 20.

[0045] The battery model BM includes, as parameters, the SOC, SOH, temperature, and current of the power storage device 10. The charge / discharge system model CSM includes, as parameters, the efficiency, resistance, rotation speed, set voltage, and voltage control characteristics of the charger / discharger. The parameters of the battery model BM and the charge / discharge system model CSM in the initial state are set by the user.

[0046] FIG. 5 is a schematic diagram showing an example of a parameter setting screen in the battery model BM. When performing a simulation, the control unit 101 of the development support device 100 generates screen data as shown in FIG. 5 and displays it on the display unit 105. The user inputs the initial states of the current, temperature, SOC, and SOH of the power storage device 10 using the operation unit 104. The current and temperature are set to change over time. The user may prepare a file of a graph showing the time change of the current and temperature in advance, and select a desired file through a file selection screen (not shown) that is presented when the reference button is pressed. The user may also directly draw a graph showing the time change of the current and temperature in the input field. The SOC and SOH are set to numerical values ​​through the operation unit 104. When the power storage element 11 is composed of, for example, four cells, the SOC and SOH may be set for each cell.

[0047] FIG. 6 is a schematic diagram showing an example of a parameter setting screen in the charge / discharge system model CSM. When performing a simulation, the control unit 101 of the development support device 100 generates screen data as shown in FIG. 6 and displays it on the display unit 105. The user inputs the efficiency, resistance, rotation speed, set voltage, and initial state of the voltage control characteristic of the alternator 22 and the electric motor 23 using the operation unit 104. Numerical values ​​are set for the efficiency, resistance, rotation speed, and set voltage through the operation unit 104. For the voltage control characteristic, a time change of the voltage is set. The user may prepare a file of a graph showing the time change of the voltage in advance, and select a desired file through a file selection screen (not shown) that is presented when the reference button is pressed. The user may also directly draw a graph showing the time change of the voltage in the input field.

[0048] In this embodiment, separate parameter setting screens are provided for the battery model BM and the charge / discharge system model, but a parameter setting screen for both may be integrated.

[0049] The process executed by the development support device 100 will be described below. Fig. 7 is a flowchart showing the procedure of processing executed by development support device 100. Control unit 101 of development support device 100 displays a parameter setting screen as shown in Fig. 5 and Fig. 6 on display unit 105 in order to accept parameters in the initial state (step S101). Control unit 101 accepts input of parameters through the displayed parameter setting screen (step S102).

[0050] The control unit 101 sets the received parameters as initial states and executes a simulation using the battery model BM and the charge / discharge system model CSM (step S103). The control unit 101 may simulate the behavior of the power storage device 10 when the efficiency, resistance, rotation speed, set voltage, and voltage control characteristics of the alternator 22 and the electric motor 23 are set. A known method is used for the simulation. For example, the control unit 101 can estimate the SOC, SOH, cell voltage, and cell temperature of the power storage element 11 by executing a simulation using an equivalent circuit of the power storage element 11. In addition, the control unit 101 can estimate the open / closed state of the relay 16 by simulating the operation of the BMU 12.

[0051] The control unit 101 displays the results of the simulation on the display unit 105 (step S104). FIG. 8 is a schematic diagram showing an example of the display of the results of the simulation. The control unit 101 displays, as a graph, the time-dependent changes in the SOC, SOH, voltage, and temperature of the energy storage element 11 as the results of the simulation. In the example of FIG. 8, the voltage and temperature of the energy storage element 11 are displayed for each cell. When the control unit 101 detects an overvoltage, a low voltage, an overcurrent, a low current, or an abnormal temperature in the energy storage element 11 or detects a relay abnormality such as the relay 16 being always open, the control unit 101 may issue an alert and display it. In the example of FIG. 8, the control unit 101 notifies the user that an abnormality has occurred by turning on an alert lamp.

[0052] The control unit 101 determines the compatibility between the power storage device 10 and the charging / discharging system 20 based on the results of the simulation (step S105). If the result of the simulation indicates that a battery abnormality such as an overvoltage, low voltage, overcurrent, or low current occurs, that a temperature abnormality occurs, or that a relay abnormality occurs such that the relay 16 is always open, the control unit 101 determines that the compatibility between the power storage device 10 and the charging / discharging system 20 is not good. On the other hand, if no such abnormality occurs, the control unit 101 determines that the compatibility between the power storage device 10 and the charging / discharging system 20 is good.

[0053] As described above, in the present embodiment, a simulation is performed using the battery model BM that simulates the power storage device 10 and the charge / discharge system model CSM that simulates the charge / discharge system 20, thereby estimating the behavior of the power storage device 10, and determining the compatibility between the power storage device 10 and the charge / discharge system 20 based on the estimation result. Therefore, there is no need to perform verification using actual or prototype products of the power storage device 10 and the charge / discharge system 20, and the compatibility between the power storage device 10 and the charge / discharge system 20 can be determined by the simulation. As a result, the development support device 100 can determine the specifications of the charge / discharge system 20 and the power storage device 10 to be mounted on the vehicle C at an early stage of product development.

[0054] The embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is defined by the claims, not by the above meaning, and is intended to include all modifications within the meaning and scope of the claims.

[0055] For example, in the present embodiment, the power storage device 10 has been described as a power source for a vehicle. The vehicle is not limited to a four-wheeled vehicle, and may be a two-wheeled vehicle. Alternatively, the vehicle may be a train, an AGV (Automatic Guided Vehicle), an unmanned aerial vehicle (drone), an aircraft, or other moving object. The power storage device 10 may be a high-voltage power source (several hundred V) for driving the vehicle, an auxiliary battery (12 V or 24 V) for supplying a power source other than the driving power, an engine starting battery (12 V or 24 V), or a mild hybrid battery (48 V). Examples of a charging system for a vehicle include, but are not limited to, regenerative power recovered when the vehicle decelerates, a solar power generation system mounted on the roof or the like, a 100 V power source or a 200 V quick charger for charging while parked, and a power storage system incorporating a reused battery. The power storage device 10 may be a power source for an electronic device, or may be a power source for power storage. In these cases, the development support device 100 may determine the compatibility of the power storage device with a charging / discharging system provided in the electronic device or power storage facility.

[0056] In the present embodiment, the configuration of the energy storage element 11 composed of a plurality of lithium ion secondary batteries has been described. Alternatively, the energy storage device 10 may be a module in which a plurality of cells are connected, a bank in which a plurality of modules are connected, a domain in which a plurality of banks are connected, or the like. In addition, any battery such as an all-solid-state lithium ion battery, a zinc-air battery, a sodium ion battery, or a lead battery may be adopted instead of the lithium ion secondary battery.

[0057] Furthermore, in this embodiment, the charging / discharging system 20 in a vehicle has been described as an example of a power management system. Alternatively, the present invention can be applied to any system including a 12V or 48V battery, regenerative power, solar power generation, a 100V power source, a power conditioner (power conditioner), a power storage system incorporating a reused battery, and the like. [Explanation of symbols]

[0058] 10. Energy storage devices 20 Charging and discharging system 21 Charging ECU 22 Alternator 23 Electric Motor 30 Vehicle ECU 100 Development support equipment 101 Control section 102 Storage section 103 Communications Department 104 Operation section 105 Display section BM Battery Model CSM charge / discharge system model

Claims

1. On the computer, estimating a state of at least one of the power storage device and the power management system by executing a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device; Based on the estimated state of the power storage device, compatibility between the power storage device and the power management system is determined. A computer program for executing a process, The battery model is a computer program including a part model that simulates components that configure the power storage device.

2. The component model includes a model simulating an interruption circuit element for interrupting or connecting a charge / discharge path.

2. The computer program product of claim 1.

3. The computer includes: If the model simulating the interruption circuit element exhibits abnormal behavior as a result of executing the simulation, it is determined that the compatibility between the power storage device and the power management system is not good.

3. A computer program product as claimed in claim 2 for carrying out a process.

4. The computer includes: A selection of a file showing a time change in a current of the power storage device, a file showing a time change in a temperature of the power storage device, or a file showing a time change in a voltage of a load included in the charge / discharge system model is accepted. A computer program product according to any one of claims 1 to 3 for executing a process.

5. The computer includes: The estimation results for each model are displayed on a display device. A computer program product according to any one of claims 1 to 4 for executing a process.

6. an estimation unit that estimates a state of at least one of the power storage device and the power management system by executing a simulation using a battery model that simulates the power storage device and a charge / discharge system model that simulates a power management system for the power storage device; a determination unit that determines compatibility between the power storage device and the power management system based on the estimated state of the power storage device; Equipped with The battery model includes a part model that simulates components that configure the power storage device.

7. The computer estimating a state of at least one of the power storage device and the power management system by executing a simulation using a battery model that simulates a power storage device and a charge / discharge system model that simulates a power management system for the power storage device; Based on the estimated state of the power storage device, compatibility between the power storage device and the power management system is determined. A method of determining The battery model includes a part model that simulates components that configure the power storage device.

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