JP2023154255A - Battery state determination system, battery state determination device, battery state determination method, battery state determination program, and storage medium - Google Patents

Abstract

To provide a battery state determination device, a battery state determination method, a battery state determination program, and a storage medium, capable of improving determination accuracy of charging shortage of a rechargeable battery.SOLUTION: A battery state determination system 2 comprises a controller 14 configured to acquire an internal resistance value R1 calculated on the basis of a current value and a voltage value of a rechargeable battery 11. The controller 14 is configured to determine charging shortage of the rechargeable battery 11 on the basis of the internal resistance value R1 and a determination threshold TH.SELECTED DRAWING: Figure 1

Description

The technology disclosed in this application relates to a battery condition determination system, a battery condition determination device, a battery condition determination method, a battery condition determination program, and a storage medium.

Patent Document 1 describes a method of preventing a battery from dying using a battery voltage value. Patent Document 2 describes a method of determining whether a battery is insufficiently charged using the state of health (SOH) of the battery. Patent Document 3 describes a method of determining whether or not the engine can be started using the remaining battery charge amount.

Patent No. 4053918 Patent No. 4670778 Japanese Unexamined Patent Publication No. 63-298078

An object of the technology disclosed in the present application is to provide a battery condition determination system, a battery condition determination device, a battery condition determination method, a battery condition determination program, and a storage medium that can improve the accuracy of determining insufficient charge of a rechargeable battery. There is a particular thing.

According to a first feature, the battery condition determination system includes a controller configured to obtain an internal resistance value calculated based on a current value and a voltage value of the rechargeable battery. The controller is configured to determine whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold.

In the battery state determination system according to the first feature, the controller determines whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold value, and therefore accurately determines whether the rechargeable battery is undercharged based on the internal resistance value. can. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved.

According to the second feature, in the battery state determination system according to the first feature, the controller determines the starting limit discharge, which is the limit discharge amount of the rechargeable battery that can start the load electrically connected to the rechargeable battery. The determination threshold is calculated based on the amount.

In the battery state determination system according to the second feature, since the controller calculates the determination threshold based on the starting limit discharge amount, it is possible to improve the accuracy of the determination threshold according to the specifications of the rechargeable battery. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be further improved.

According to the third feature, in the battery condition determination system according to the second feature, the controller determines the open circuit voltage of the rechargeable battery, the minimum voltage value of the rechargeable battery required for starting the load, and the minimum voltage value of the rechargeable battery required for starting the load. The starting limit resistance value corresponding to the starting limit discharge amount is calculated based on the required minimum current value of the rechargeable battery.

In the battery state determination system according to the third feature, the starting limit resistance value corresponding to the starting limit discharge amount can be calculated according to the specifications of the rechargeable battery. Therefore, by using the starting limit resistance value, it is possible to improve the accuracy of the determination threshold according to the specifications of the rechargeable battery, and it is possible to further improve the accuracy of determining whether the rechargeable battery is undercharged.

According to the fourth feature, in the battery state determination system according to the third feature, the controller includes relational information indicating the relationship between the discharge amount of the rechargeable battery and the internal resistance of the rechargeable battery, and a starting limit resistance value. The starting limit discharge amount is calculated based on , .

In the battery state determination system according to the fourth feature, the controller calculates the starting limit discharge amount based on the related information and the starting limit resistance value. Therefore, the accuracy of the determination threshold value can be improved according to the specifications of the rechargeable battery, and the accuracy of determining whether the rechargeable battery is undercharged can be improved more reliably.

According to the fifth feature, in the battery state determination system according to the fourth feature, the controller calculates the determination threshold based on the discharge amount history information regarding the history of the discharge amount of the rechargeable battery and the starting limit discharge amount. It is configured as follows.

In the battery state determination system according to the fifth feature, the accuracy of the determination threshold value can be further improved by calculating the determination threshold value in consideration of the discharge amount history information. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved more reliably.

According to the sixth feature, in the battery state determination system according to the first feature, the controller is configured to perform a controller based on at least one of load information regarding a load electrically connected to the rechargeable battery and battery information regarding the rechargeable battery. is configured to update the determination threshold value.

In the battery state determination system according to the sixth feature, the determination threshold value can be updated according to the load and the specifications of the rechargeable battery. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved more reliably. Note that the sixth feature can be applied not only to the first feature but also to the second to fifth features.

According to the seventh feature, in the battery state determination system according to the first feature, the controller compares at least one of the internal resistance value, the amount of change in the internal resistance value, and the rate of change in the internal resistance value with the determination threshold value. The device is configured to determine whether the rechargeable battery is insufficiently charged.

In the battery state determination system according to the seventh feature, it is possible to more reliably improve the accuracy of determining whether the rechargeable battery is undercharged. Note that the seventh feature can be applied not only to the first feature but also to the second to sixth features.

According to the eighth feature, in the battery state determination system according to the first feature, the determination threshold includes a resistance threshold. The controller is configured to determine that the rechargeable battery is undercharged if the internal resistance value is greater than a resistance threshold.

In the battery state determination system according to the eighth feature, by using the internal resistance value and the resistance threshold value, it is possible to more reliably improve the accuracy of determining whether the rechargeable battery is undercharged. Note that the eighth feature can be applied not only to the first feature but also to the second to seventh features.

According to the ninth feature, in the battery state determination system according to the first feature, the determination threshold includes a difference threshold. The controller is configured to determine that the rechargeable battery is undercharged when the amount of change in the internal resistance value, which is the difference between the internal resistance value and the first reference resistance value, is greater than a difference threshold.

In the battery state determination system according to the ninth feature, by using the amount of change in the internal resistance value and the difference threshold value, it is possible to more reliably improve the accuracy of determining whether the rechargeable battery is undercharged. Note that the ninth feature can be applied not only to the first feature but also to the second to eighth features.

According to the tenth feature, in the battery state determination system according to the first feature, the determination threshold includes a ratio threshold. The controller is configured to determine that the rechargeable battery is undercharged if a rate of change in the internal resistance value, which is a ratio of the internal resistance value to the second reference resistance value, is greater than a ratio threshold.

In the battery state determination system according to the tenth feature, by using the rate of change of the internal resistance value and the ratio threshold value, it is possible to more reliably improve the accuracy of determining whether the rechargeable battery is undercharged. Note that the tenth feature can be applied not only to the first feature but also to the second to ninth features.

According to the eleventh feature, in the battery state determination system according to the first feature, when the controller discharges the rechargeable battery multiple times while the rechargeable battery has stopped supplying power to the load, The internal resistance value is calculated based on the current value and voltage value obtained.

In the battery state determination system according to the eleventh feature, since the controller calculates the internal resistance value using the current value and voltage value when the rechargeable battery is discharged multiple times, the accuracy of calculating the internal resistance value can be improved. I can do it. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved more reliably. Note that the eleventh feature can be applied not only to the first feature but also to the second to tenth features.

According to the twelfth feature, in the battery state determination system according to the first feature, the controller is configured to determine the deterioration state of the rechargeable battery based on the internal resistance value. The controller is configured to correct the determination threshold based on the state of deterioration.

In the battery state determination system according to the twelfth feature, a determination threshold value that is corrected according to the deterioration state of the rechargeable battery can be used. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved more reliably. Note that the twelfth feature can be applied not only to the first feature but also to the second to eleventh features.

According to the thirteenth feature, the battery state determination system according to the first feature further includes a current sensor and a voltage sensor. The current sensor is electrically connected to the controller and configured to measure a current value of the rechargeable battery. A voltage sensor is electrically connected to the controller and configured to measure a voltage value of the rechargeable battery.

In the battery state determination system according to the thirteenth feature, since the controller can relatively quickly obtain the measured current value and the measured voltage value of the current sensor, it is possible to increase the speed of determining whether the rechargeable battery is undercharged. Note that the thirteenth feature can be applied not only to the first feature but also to the second to twelfth features.

According to the fourteenth feature, the battery state determination system according to the first feature includes a main unit including a load electrically connected to the rechargeable battery;
An external device. at least one of the main device and the external device includes at least a portion of the controller;
In the battery state determination system according to the fourteenth feature, at least one of the main device and the external device includes at least a part of the controller, so that the main device and the external device can perform the process of determining whether the rechargeable battery is insufficiently charged. It can be shared by the device. Therefore, depending on the specifications of the main device and the external device, it is possible to improve at least one of the accuracy and speed of determining whether the rechargeable battery is undercharged. Note that the fourteenth feature can be applied not only to the first feature but also to the second to thirteenth features.

According to the fifteenth feature, in the battery state determination system according to the fourteenth feature, the controller includes a first controller included in one of the main device and the external device, and a second controller included in the other of the main device and the external device. A controller. The first controller is configured to determine whether the rechargeable battery is undercharged by comparing at least one of an internal resistance value, an amount of change in the internal resistance value, and a rate of change in the internal resistance value with a determination threshold value.

In the battery state determination system according to the fifteenth feature, the first controller executes the process of determining whether the rechargeable battery is insufficiently charged. It becomes easier for the first controller to obtain information, and the speed of determining insufficient charging is improved. In addition, when the first controller is included in the external device, it becomes easier to share information with the main body device and devices other than the main body device after the first controller determines that charging is insufficient.

According to the sixteenth feature, in the battery state determination system according to the fifteenth feature, the first controller is configured to transmit an insufficient charge determination result indicating that the rechargeable battery is insufficiently charged to the second controller. be done.

In the battery state determination system according to the sixteenth feature, the first controller transmits the insufficient charge determination result to the second controller, so the insufficient charge determination result can be shared between the main device and the external device, and the battery state determination system Improved convenience.

According to the seventeenth feature, in the battery state determination system according to the sixteenth feature, the second controller is configured to notify the user of the battery state determination system of the insufficient charge determination result.

In the battery state determination system according to the seventeenth feature, even if one of the main unit and the external device executes the insufficient charging determination process, the other of the main unit and the external device can notify the user of the insufficient charging determination result. Therefore, the convenience of the battery state determination system is further improved.

According to an eighteenth feature, in the battery state determination system according to the fifteenth feature, the external device includes a first controller. The first controller is configured to acquire calculation information used to calculate at least one of the internal resistance value and the determination threshold value from the plurality of main body devices. The first controller is configured to perform a learning process based on the calculation information.

In the battery state determination system according to the eighteenth feature, since the first controller included in the external device executes the learning process based on calculation information acquired from a plurality of main devices, at least one of the internal resistance value and the determination threshold value is It is possible to improve the accuracy of one calculation based on data acquired from a plurality of vehicles, and the accuracy of determining whether charging is insufficient can be improved more reliably. Note that the 18th feature can be applied not only to the 15th feature but also to the 16th or 17th feature.

According to the nineteenth feature, the battery state determination device includes a controller configured to obtain an internal resistance value calculated based on a current value and a voltage value of the rechargeable battery. The controller is configured to determine whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold.

In the battery state determination device according to the nineteenth feature, the controller determines whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold value, and therefore accurately determines whether the rechargeable battery is undercharged based on the internal resistance value. can. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved.

According to the 20th characteristic, the battery state determination method includes obtaining, by the controller, an internal resistance value calculated based on the current value and voltage value of the rechargeable battery, and based on the internal resistance value and the determination threshold value. The controller determines whether the rechargeable battery is insufficiently charged.

In the battery state determination method according to the twentieth feature, since the controller determines whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold, it is possible to accurately determine whether the rechargeable battery is undercharged based on the internal resistance value. Can be judged. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved.

According to the twenty-first feature, the battery state determination program causes the computer to execute the battery state determination method according to the twentieth feature.

In the battery state determination program according to the twenty-first feature, since the controller determines whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold, the controller can accurately determine whether the rechargeable battery is undercharged based on the internal resistance value. Can be judged. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved.

According to the twenty-second feature, the computer-readable storage medium stores the battery state determination program according to the twenty-first feature.

In the storage medium according to the twenty-second feature, when the battery state determination program is executed by the computer, the controller determines whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold value. Based on this, it is possible to accurately determine whether the rechargeable battery is insufficiently charged. Therefore, the accuracy of determining whether the rechargeable battery is insufficiently charged can be improved.

According to the technology disclosed in the present application, a battery condition determination system, a battery condition determination device, a battery condition determination method, a battery condition determination program, and a battery condition determination program are provided that can improve the accuracy of determining insufficient charge of a rechargeable battery. A storage medium for storing data can be provided.

FIG. 1 is a schematic block diagram of a battery condition determination system. FIG. 2 is a graph showing the relationship between the discharge amount and internal resistance of a rechargeable battery. FIG. 3 is a schematic block diagram showing the exchange of information in the battery condition determination system shown in FIG. FIG. 4 is a flowchart showing a battery state determination method executed in the battery state determination system shown in FIG. FIG. 5 is a flowchart showing a battery state determination method executed in the battery state determination system shown in FIG. FIG. 6 is a graph showing the relationship between the discharge amount and internal resistance of a rechargeable battery (first modification). FIG. 7 is a flowchart showing a battery state determination method executed in the battery state determination system according to the first modification. FIG. 8 is a graph showing the relationship between the discharge amount and internal resistance of a rechargeable battery (second modification). FIG. 9 is a flowchart showing a battery state determination method executed in the battery state determination system according to the second modification. FIG. 10 is a schematic block diagram showing the exchange of information in the battery state determination system according to the third modification. FIG. 11 is a flowchart showing a battery state determination method executed in the battery state determination system according to the third modification. FIG. 12 is a flowchart showing a battery state determination method executed in the battery state determination system according to the third modification. FIG. 13 is a schematic block diagram showing the exchange of information in the battery state determination system according to the fourth modification. FIG. 14 is a flowchart showing a battery state determination method executed in the battery state determination system according to the fourth modification. FIG. 15 is a flowchart showing a battery state determination method executed in the battery state determination system according to the fourth modification. FIG. 16 is a schematic block diagram showing the exchange of information in the battery state determination system according to the fifth modification.

Hereinafter, embodiments will be described with reference to the drawings. In the figures, the same reference numerals indicate corresponding or identical configurations.

As shown in FIG. 1, the battery state determination system 2 includes a main body device 10 and an external device 30. Main device 10 includes a rechargeable battery 11 and a load 12 electrically connected to rechargeable battery 11 . An example of main body device 10 includes a vehicle in which rechargeable battery 11 is mounted. Rechargeable battery 11 is electrically connected to load 12 to supply electricity to load 12 . Rechargeable battery 11 includes, for example, secondary batteries such as lead batteries, lithium ion batteries, and nickel metal hydride batteries. Therefore, rechargeable battery 11 may also be referred to as secondary battery 11.

The load 12 is operated by electricity supplied from the rechargeable battery 11 . Load 12 includes at least one electrical device. When the rechargeable battery 11 is mounted on a vehicle, examples of electrical equipment include an electronic control unit (ECU), lights, heaters, audio equipment, sensors, and cameras.

Examples of vehicles include automobiles. Examples of automobiles include automobiles equipped with an engine (internal combustion engine) as a power source, hybrid vehicles equipped with an engine and vehicle drive motor as a power source, and electric vehicles or fuel cells equipped with a vehicle drive motor as a power source. Including automobiles. Therefore, for example, the rechargeable battery 11 may be used to drive the vehicle, or a vehicle drive battery other than the rechargeable battery 11 may be mounted on the vehicle. The vehicle is not limited to the above vehicles. Furthermore, the rechargeable battery 11 may be used for purposes other than vehicles.

Main device 10 includes a battery state determination device 13 . That is, the battery condition determination system 2 includes the battery condition determination device 13 . Battery condition determination device 13 is configured to determine the condition of rechargeable battery 11 . Specifically, the battery state determination device 13 is configured to determine whether the rechargeable battery 11 is undercharged.

External device 30 includes, for example, a server 31 and a user terminal 41. The server 31 is connectable to the Internet. The battery condition determination device 13 and the user terminal 41 can be connected to the server 31 via the Internet. The battery condition determination device 13 is configured to communicate with the server 31 via the Internet. User terminal 41 is configured to communicate with server 31 via the Internet. Examples of user terminals 41 include smartphones, tablet computers, and personal computers. Note that the battery condition determination device 13 and the user terminal 41 may be configured to communicate with each other via the Internet.

Battery condition determination device 13 includes charging circuit 15 . Rechargeable battery 11 is electrically connected to charging circuit 15 . The charging circuit 15 supplies electricity to the rechargeable battery 11 and charges the rechargeable battery 11 . When rechargeable battery 11 is mounted on a vehicle, for example, charging circuit 15 includes a power generating device such as an alternator and a vehicle drive motor.

The load 12 is started by electricity supplied from the rechargeable battery 11 . For example, when the start button of the vehicle is pressed or the start key is turned, the supply of electricity from the rechargeable battery 11 to the load 12 is started, and the load 12 is started.

While the load 12 is in operation, the rechargeable battery 11 repeatedly supplies (discharges) electricity to the load 12 and is charged by the charging circuit 15 . However, if the rechargeable battery 11 is discharged for a long time or electricity is consumed by the load 12 while the rechargeable battery 11 is not being charged from the charging circuit 15, the discharge limit of the rechargeable battery 11 that can start the load 12 is reached. The rechargeable battery 11 may be discharged beyond the starting limit discharge amount DL.

In order to avoid such a so-called dead battery, the battery state determination system 2 is configured to determine whether the rechargeable battery 11 is insufficiently charged. Here, the term "insufficient charging" includes a state where the battery is dead and a state where the battery may become dead after a predetermined period of time has elapsed.

The battery condition determination device 13 includes a controller 14 . That is, the battery state determination system 2 includes the controller 14. At least one of the main device 10 and the external device 30 includes at least a portion of the controller 14. In this embodiment, since the main body device 10 includes the battery state determination device 13, the main body device 10 includes the entire controller 14. However, the external device 30 (eg, server 31) may include the entire controller 14. Further, the main device 10 may include a portion of the controller 14, and the external device 30 may include the remaining portion of the controller 14. Similarly, the external device 30 may include the entire battery condition determination device 13. The main device 10 may include a part of the battery condition determination device 13, and the external device 30 may include the remaining portion of the battery condition determination device 13.

In this embodiment, the controller 14 constitutes, for example, an ECU (Electronic Control Unit). Controller 14 is electrically connected to rechargeable battery 11 . The controller 14 includes, for example, a processor 14P, a memory 14M, a circuit board 14C, and a bus 14B.

The processor 14P includes, for example, a CPU (Central Processing Unit) and/or an MPU (Micro Processing Unit). Memory 14M includes, for example, volatile and/or non-volatile memory. Examples of volatile memory include RAM (Random Access Memory) and/or DRAM (Dynamic Random Access Memory). Examples of non-volatile memory include ROM (Read Only Memory) and EEPROM (Electrically Erasable Programmable ROM). Memory 14M may also be referred to as a computer-readable storage medium. Processor 14P and memory 14M are electrically mounted on circuit board 14C. Processor 14P and memory 14M are electrically connected to each other via circuit board 14C. Processor 14P may also be referred to as hardware processor 14P. Memory 14M may also be referred to as hardware memory 14M.

The controller 14 is programmed to implement a control algorithm for the battery condition determination system 2 and the battery condition determination device 13. The memory 14M of the controller 14 stores, for example, software such as a program for implementing a control algorithm for the battery state determination device 13. The processor 14P implements a control algorithm for the battery state determination device 13 by reading and executing a program stored in the memory 14M.

The configuration of the controller 14 is not limited to the processor 14P, memory 14M, circuit board 14C, and bus 14B. The configuration of the controller 14 can be realized using only hardware or a combination of hardware and software. Furthermore, the processor 14P and the memory 14M may be configured as a single chip such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). Note that the controller 14 may also be referred to as a controller circuit 14, a controller circuitry 14, a circuit 14, and/or a circuit 14.

Controller 14 is electrically connected to rechargeable battery 11 . Controller 14 includes a power supply circuit 14S electrically connected to rechargeable battery 11. The controller 14 operates using electricity supplied from the rechargeable battery 11 to the power supply circuit 14S. The power supply circuit 14S converts, for example, a voltage (for example, 12V) supplied from the rechargeable battery 11 into a predetermined voltage (for example, 3.3V or 5V) as necessary. Power supply circuit 14S is electrically connected to processor 14P and memory 14M via circuit board 14C and bus 14B.

As shown in FIG. 1, the battery state determination device 13 further includes an interface 20 electrically connected to the controller 14. Interface 20 is configured to receive input information and/or to send battery condition determination results to server 31 and/or user terminal 41 . The battery state determination result includes, for example, an insufficient charge determination result indicating that the rechargeable battery 11 is insufficiently charged. Interface 20 is electrically connected to processor 14P and memory 14M via circuit board 14C and bus 14B. The interface 20 operates using electricity supplied from the controller 14. Interface 20 includes a user interface 22 and a communication unit 24.

User interface 22 is electrically connected to controller 14 . User interface 22 is electrically connected to processor 14P and memory 14M via circuit board 14C and bus 14B. User interface 22 is configured to receive input information from a user. The controller 14 stores input information input from the user interface 22 in the memory 14M. An example of the user interface 22 includes an operation panel such as a touch panel.

The communication unit 24 is electrically connected to the controller 14. Communication unit 24 is electrically connected to processor 14P and memory 14M via circuit board 14C and bus 14B. The communication unit 24 is configured to receive input information from the server 31 and/or the user terminal 41. The controller 14 stores input information input to the communication unit 24 in the memory 14M. Further, the communication unit 24 is configured to transmit a battery state determination result (for example, a charging shortage determination result) to the server 31 and/or the user terminal 41.

Communication unit 24 includes a wireless communication circuit. The wireless communication circuit is electrically connected to the controller 14 and can be wirelessly connected to the Internet, for example. The wireless communication circuit is configured to transmit the battery state determination result (for example, the insufficient charge determination result) to the server 31 via the Internet. When the rechargeable battery 11 is mounted on a vehicle, the communication unit 24 includes, for example, a wireless communication circuit and a gateway ECU.

The wireless communication circuit includes, for example, an antenna, a wireless transmitter circuit, and a wireless receiver circuit. The antenna is electrically connected to the wireless transmitting circuit and the wireless receiving circuit. The wireless transmission circuit is configured to wirelessly transmit signals via the antenna. The wireless receiving circuit is configured to wirelessly receive signals via the antenna. The wireless transmission circuit is configured to encrypt the signal with a predetermined protocol. The wireless receiving circuit is configured to decode the wireless signal with a predetermined protocol.

As shown in FIG. 1, the server 31 forms part of, for example, a data center or a cloud, and is connectable to the Internet. The server 31 includes a controller 32, an interface 33, and a display 34. Interface 33 and display 34 are electrically connected to controller 32. Display 34 is electrically connected to controller 32 and configured to display information. Controller 32 is configured to control display 34 to display information.

The controller 32 includes, for example, a processor 32P, a memory 32M, a circuit board 32C, and a bus 32B. Processor 32P includes, for example, a CPU and/or an MPU. Memory 32M includes, for example, volatile and/or non-volatile memory. Examples of volatile memory include RAM and/or DRAM. Examples of non-volatile memory include ROM and EEPROM. Memory 32M may also be referred to as a computer-readable storage medium. Processor 32P and memory 32M are electrically mounted on circuit board 32C. Processor 32P and memory 32M are electrically connected to each other via circuit board 32C. Processor 32P may also be referred to as hardware processor 32P. Memory 32M may also be referred to as hardware memory 32M.

Controller 32 is programmed to implement the control algorithm of server 31. The memory 32M of the controller 32 stores software such as a program for realizing the control algorithm of the server 31, for example. The processor 32P implements a control algorithm for the server 31 by reading and executing a program stored in the memory 32M.

The configuration of the controller 32 is not limited to the processor 32P, memory 32M, circuit board 32C, and bus 32B. The configuration of the controller 32 can be realized using only hardware or a combination of hardware and software. Further, the processor 32P and the memory 32M may be configured as a single chip such as an ASIC or an FPGA. Note that the controller 32 may also be referred to as a controller circuit 32, a controller circuitry 32, a circuit 32, and/or a circuit 32.

Interface 33 is electrically connected to processor 32P and memory 32M via circuit board 32C and bus 32B. Interface 33 includes a user interface 35 and a communication section 36.

User interface 35 is electrically connected to controller 32. User interface 35 is electrically connected to processor 32P and memory 32M via circuit board 32C and bus 32B. The user interface 35 is used when a user operates the server 31. Examples of user interface 35 include a keyboard, mouse, and touch panel.

The communication unit 36 is electrically connected to the controller 32. Communication unit 36 is electrically connected to processor 32P and memory 32M via circuit board 32C and bus 32B. The communication unit 36 is configured to communicate with the battery condition determination device 13 and the user terminal 41.

The communication unit 36 includes, for example, a wired communication circuit. The wired communication circuit is electrically connected to the controller 32 and can be connected to the Internet by wire, for example. The wired communication circuit is configured to communicate with the battery condition determination device 13 and the user terminal 41 via the Internet. The communication unit 36 may include a wireless communication circuit.

As shown in FIG. 3, the communication unit 36 is configured to receive the insufficient charge determination result from the battery state determination device 13. The communication unit 36 is configured to transmit the insufficient charge determination result received from the battery state determination device 13 to the user terminal 41 . The communication unit 36 is configured to receive input information from the user terminal 41. The communication unit 36 is configured to transmit input information received from the user terminal 41 to the battery state determination device 13.

As shown in FIG. 1, user terminal 41 is configured to communicate with server 31. As shown in FIG. The user terminal 41 is a device used by a user of the battery condition determination system 2. The user terminal 41 is configured to display the battery state determination result (for example, the insufficient charge determination result) transmitted from the server 31. Further, the user terminal 41 is configured to receive input of information necessary for battery status determination from the user of the battery status determination system 2, and configured to transmit the input information to the server 31. Examples of user terminals 41 include smartphones, tablet computers, and personal computers. Note that the user terminal 41 may be configured to communicate with the battery state determination device 13.

User terminal 41 includes a controller 42, an interface 43, and a display 44. Interface 43 and display 44 are electrically connected to controller 42 . Display 44 is electrically connected to controller 42 and configured to display information. Controller 42 is configured to control display 44 to display information.

The controller 42 includes, for example, a processor 42P, a memory 42M, a circuit board 42C, and a bus 42B. Processor 42P includes, for example, a CPU and/or an MPU. Memory 42M includes, for example, volatile and/or non-volatile memory. Examples of volatile memory include RAM and/or DRAM. Examples of non-volatile memory include ROM and EEPROM. Memory 42M may also be referred to as a computer-readable storage medium. Processor 42P and memory 42M are electrically mounted on circuit board 42C. Processor 42P and memory 42M are electrically connected to each other via circuit board 42C. Processor 42P may also be referred to as hardware processor 42P. Memory 42M may also be referred to as hardware memory 42M.

The controller 42 is programmed to implement the control algorithm of the user terminal 41. The memory 42M of the controller 42 stores software such as a program for implementing a control algorithm for the user terminal 41, for example. The processor 42P implements a control algorithm for the user terminal 41 by reading and executing a program stored in the memory 42M.

The configuration of the controller 42 is not limited to the processor 42P, memory 42M, circuit board 42C, and bus 42B. The configuration of the controller 42 can be realized using only hardware or a combination of hardware and software. Further, the processor 42P and the memory 42M may be configured as one chip such as an ASIC or an FPGA. Note that the controller 42 may also be referred to as a controller circuit 42, a controller circuitry 42, a circuit 42, and/or a circuit 42.

Interface 43 is electrically connected to processor 42P and memory 42M via circuit board 42C and bus 42B. Interface 43 includes a user interface 45 and a communication section 46.

User interface 45 is electrically connected to controller 42 . User interface 45 is electrically connected to processor 42P and memory 42M via circuit board 42C and bus 42B. User interface 45 is configured to receive input information from a user. The controller 42 stores input information input from the user interface 45 in the memory 42M. Examples of user interface 45 include a keyboard, mouse, and touch panel.

The communication unit 46 is electrically connected to the controller 42. Communication unit 46 is electrically connected to processor 42P and memory 42M via circuit board 42C and bus 42B. The communication unit 46 is configured to communicate with the server 31. Communication unit 46 includes a wireless communication circuit. The wireless communication circuit is electrically connected to the controller 42 and configured to wirelessly communicate with the server 31 via the Internet. The wireless communication circuit may be configured to wirelessly communicate with the battery condition determination device 13 via the Internet.

Similar to the communication unit 24, the wireless communication circuit of the communication unit 46 includes, for example, an antenna, a wireless transmission circuit, and a wireless reception circuit. The antenna is electrically connected to the wireless transmitting circuit and the wireless receiving circuit. The wireless transmission circuit is configured to wirelessly transmit signals via the antenna. The wireless receiving circuit is configured to wirelessly receive signals via the antenna. The wireless transmission circuit is configured to encrypt the signal with a predetermined protocol. The wireless receiving circuit is configured to decode the wireless signal with a predetermined protocol.

As shown in FIG. 3, the communication unit 46 is configured to transmit input information to the server 31 via the Internet. The communication unit 46 is configured to receive the insufficient charging determination result transmitted from the server 31 via the Internet.

As shown in FIG. 1, the battery state determination device 13 further includes a current sensor 16 and a voltage sensor 18. That is, the battery state determination system 2 further includes a current sensor 16 and a voltage sensor 18. Current sensor 16 is electrically connected to controller 14 and configured to measure the current value of rechargeable battery 11 . Voltage sensor 18 is electrically connected to controller 14 and configured to measure the voltage value of rechargeable battery 11 .

Current sensor 16 is arranged between rechargeable battery 11 and load 12 and between rechargeable battery 11 and charging circuit 15 . The current sensor 16 is configured to measure the current value of the discharge current flowing from the rechargeable battery 11 to the load 12, and is configured to measure the current value of the charging current flowing from the charging circuit 15 to the rechargeable battery 11. Ru. The controller 14 acquires the measured current value of the current sensor 16 at a predetermined period, and stores the acquired measured current value in the memory 14M. Further, the controller 14 is configured to calculate an integrated value of measured current values as necessary.

The controller 14 acquires the measured voltage value of the voltage sensor 18 at a predetermined period while charging and discharging of the rechargeable battery 11 is stopped, and stores the acquired measured voltage value in the memory 14M as an open circuit voltage OCV. The controller 14 is configured to determine whether the rechargeable battery 11 is being discharged and whether the rechargeable battery 11 is being charged based on the current value measured by the current sensor 16. . That is, the controller 14 is configured to determine whether the load 12 is stopped.

The controller 14 is configured to obtain an internal resistance value R1 calculated based on the current value and voltage value of the rechargeable battery 11. In this embodiment, the controller 14 is configured to calculate the internal resistance value R1 based on the current value and the voltage value. The controller 14 is configured to calculate the internal resistance value R1 based on the current value measured by the current sensor 16 and the voltage value measured by the voltage sensor 18. The external device 30 (for example, the server 31) may be configured to calculate the internal resistance value R1.

The controller 14 operates in a state in which the rechargeable battery 11 stops supplying power to the load 12 (that is, a state in which only the power that maintains the minimum functions of the vehicle, etc. is supplied; only power from so-called dark current is supplied). The internal resistance value R1 is calculated based on the current value and voltage value obtained when the rechargeable battery 11 is discharged a plurality of times. The battery condition determination device 13 includes a discharge circuit 19 . Discharge circuit 19 is configured to discharge rechargeable battery 11 . Discharge circuit 19 is configured to pulse discharge rechargeable battery 11 at a predetermined frequency. Discharge circuit 19 may be configured to discharge rechargeable battery 11 in a predetermined discharge pattern, and may be configured to pulse discharge rechargeable battery 11 at a predetermined frequency. Controller 14 controls discharge circuit 19 to discharge rechargeable battery 11 . The controller 14 may control the discharge circuit 19 to cause discharge in a predetermined discharge pattern, or may control the discharge circuit 19 to cause pulse discharge at a predetermined frequency.

The controller 14 is configured to obtain a current A0 before discharge, a current A1 during discharge, a voltage V0 before discharge, and a voltage V1 during discharge. The controller 14 is configured to calculate the internal resistance value R1 based on the following equation (1) using the current A0, the current A1, the voltage V0, and the voltage V1.

R1=(V1-V0)/(A1-A0)...(1)
The controller 14 is configured to acquire the current A0, the current A1, the voltage V0, and the voltage V1 at a predetermined period, and calculate the internal resistance value R1 at a predetermined period based on equation (1). The controller 14 stores the internal resistance value R1 in the memory 14M. The controller 14 calculates the internal resistance value R1 at a predetermined period while the load 12 is stopped, and stores the internal resistance value R1 in the memory 14M.

Note that the internal resistance value R1 may be calculated using another method. For example, the internal resistance value R1 may be calculated based on the current value and voltage value measured while the rechargeable battery 11 is supplying electricity to the load 12. Further, the internal resistance value R1 may be a value corrected based on the temperature of the rechargeable battery 11, the temperature around the controller 14, and the like. Furthermore, the determination threshold TH described below may be a value corrected based on the temperature of the rechargeable battery 11, the ambient temperature of the controller 14, and the like.

The controller 14 is configured to determine whether the rechargeable battery 11 is undercharged based on the internal resistance value R1 and the determination threshold value TH. The controller 14 determines whether the rechargeable battery 11 is undercharged by comparing at least one of the internal resistance value R1, the amount of change ΔR of the internal resistance value R1, and the rate of change RR of the internal resistance value R1 with a determination threshold TH. It is configured as follows.

In this embodiment, the controller 14 is configured to determine whether the rechargeable battery 11 is undercharged by comparing the internal resistance value R1 with a determination threshold TH. The determination threshold TH includes the resistance threshold TH1. The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the internal resistance value R1 is greater than the resistance threshold TH1. The controller 14 is configured to determine that the rechargeable battery 11 is not undercharged when the internal resistance value R1 is smaller than the resistance threshold TH1. The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the internal resistance value R1 is equal to the resistance threshold value TH1. However, the controller 14 may be configured to determine that the rechargeable battery 11 is not undercharged when the internal resistance value R1 is equal to the resistance threshold value TH1. Further, the controller 14 may be configured to determine whether the rechargeable battery 11 is undercharged by comparing information other than the internal resistance value R1 (for example, information regarding the voltage of the rechargeable battery 11) with the determination threshold TH. good.

As shown in FIG. 2, the controller 14 is configured to calculate the determination threshold TH. The controller 14 is configured to calculate a resistance threshold TH1. The controller 14 is configured to calculate the determination threshold TH based on the starting limit discharge amount DL, which is the limit discharge amount of the rechargeable battery 11 that can start the load 12 electrically connected to the rechargeable battery 11. . The controller 14 is configured to calculate the resistance threshold TH1 based on the starting limit discharge amount DL.

For example, the controller 14 is configured to calculate the starting limit discharge amount DL. The controller 14 is based on the open circuit voltage OCV of the rechargeable battery 11, the minimum voltage value VM required to start the load 12 of the rechargeable battery 11, and the minimum current value AM required to start the load 12 of the rechargeable battery 11. The starting limit resistance value RL corresponding to the starting limit discharge amount DL is calculated using the starting limit discharge amount DL. The controller 14 acquires the voltage value measured by the voltage sensor 18 while the load 12 is stopped as an open circuit voltage OCV. Controller 14 stores open circuit voltage OCV in memory 14M.

The minimum voltage value VM and the minimum current value AM are determined by load information regarding the load 12 and battery information regarding the rechargeable battery 11. The minimum voltage value VM and the minimum current value AM are determined by the power consumption of the load 12 and the rated discharge capacity of the rechargeable battery 11. Controller 14 stores load information and battery information in memory 14M, and obtains minimum voltage value VM and minimum current value AM based on the load information and battery information. For example, the controller 14 sets the model numbers of at least two loads 12 , the model numbers of at least two rechargeable batteries 11 , the lowest voltage values VM corresponding to the model numbers of each load 12 and the model number of each rechargeable battery 11 , and the model numbers of at least two rechargeable batteries 11 . A table showing the model number and the minimum current value AM corresponding to the model number of each rechargeable battery 11 is stored in the memory 14M. The controller 14 obtains the lowest voltage value VM and the lowest current value AM based on the model number of the load 12, the model number of the rechargeable battery 11, and the table, and stores the obtained lowest voltage value VM and lowest current value AM in the memory 14M. do. Note that a fixed value may be used as the minimum voltage value VM. Furthermore, if the data of the lowest current value AM is not recorded, the lowest current measured value just before parking may be used as the lowest current value AM.

Interface 20 is configured to receive input of load information and battery information from a user or external device 30 . Interface 20 is configured to receive the model number of load 12 and the model number of rechargeable battery 11 from a user or external device 30 . For example, the controller 14 stores load information (for example, the model number of the load 12) and battery information (for example, the model number of the rechargeable battery 11) input by the user via the user interface 22 in the memory 14M. However, the controller 14 acquires load information (for example, the model number of the load 12) and battery information (for example, the model number of the rechargeable battery 11) from the external device 30 (for example, the server 31) via the communication unit 24. may be configured.

The controller 14 is configured to calculate the starting limit resistance value RL based on the following equation (2).

RL=(OCV-VM)/AM...(2)
The controller 14 is configured to calculate the starting limit discharge amount DL based on relationship information RS indicating the relationship between the discharge amount of the rechargeable battery 11 and the internal resistance of the rechargeable battery 11 and the starting limit resistance value RL. be done. The controller 14 stores the relationship information RS shown in FIG. 2 in the memory 14M. The controller 14 acquires the discharge amount corresponding to the starting limit resistance value RL as the starting limit discharge amount DL based on the related information RS, and stores the starting limit discharge amount DL in the memory 14M.

The controller 14 is configured to calculate the determination threshold TH based on the discharge amount history information regarding the history of the discharge amount of the rechargeable battery 11 and the starting limit discharge amount DL. The controller 14 is configured to calculate the integrated value of the current values measured by the current sensor 16 as discharge history information. The controller 14 is configured to calculate an integrated value of the dark current of the rechargeable battery 11 measured by the current sensor 16 while the load 12 is stopped. The controller 14 is configured to obtain an estimated self-discharge amount per unit time based on the battery information. The controller 14 calculates the discharge amount of the rechargeable battery 11 per unit time while the load 12 is stopped, based on the cumulative dark current value per unit time and the estimated self-discharge amount per unit time. It is composed of The estimated self-discharge amount is determined based on an approximate formula calculated taking into account temperature characteristics, or a representative value per day (percentage of capacity/day) depending on the type of rechargeable battery 11. Calculated using a table that takes into account Note that the dark current value may be a weighted average value, a moving average value, or the lowest current in the previous standby state or in the past.

Further, the controller 14 is configured to obtain a grace period from when the insufficient charging is notified until the current discharge amount reaches the starting limit discharge amount DL. For example, the interface 20 is configured to receive a grace period input from the user. The controller 14 stores the grace period input via the interface 20 in the memory 14M. The grace time may be a predetermined time. The controller 14 is configured to calculate the differential discharge amount ΔD by multiplying the discharge amount per unit time by the grace period. The controller 14 is configured to calculate the discharge amount threshold DT by subtracting the differential discharge amount ΔD from the starting limit discharge amount DL. The controller 14 is configured to calculate the resistance threshold TH1 based on the relationship information RS shown in FIG. 2 and the discharge amount threshold DT. The controller 14 calculates the remaining capacity of the rechargeable battery 11 while the load 12 is stopped, such as during parking, and subtracts the amount of discharge during parking, etc., and determines that the charge is insufficient if it falls below a predetermined determination threshold. It may be configured to make a determination.

Controller 14 is configured to update determination threshold TH based on at least one of load information regarding load 12 electrically connected to rechargeable battery 11 and battery information regarding rechargeable battery 11 . Controller 14 is configured to update resistance threshold TH1 based on load information and battery information. For example, the controller 14 newly obtains the lowest voltage value VM and the lowest current value AM based on the model number of the load 12 and the model number of the rechargeable battery 11 that are newly input via the interface 20, and the obtained lowest voltage value VM and minimum current value AM are stored in memory 14M. For example, when the rechargeable battery 11 is attached to the main device 10, the model number of the load 12 and the model number of the rechargeable battery 11 are newly input via the interface 20. The controller 14 is configured to calculate the determination threshold TH based on the newly acquired minimum voltage value VM, minimum current value AM, equation (2), and the relational information RS of FIG. 2. The controller 14 is configured to calculate the resistance threshold TH1 based on the newly acquired minimum voltage value VM, minimum current value AM, equation (2), and the relational information RS of FIG. In this way, the controller 14 updates the determination threshold TH (for example, resistance threshold TH1) based on the load information and battery information.

Controller 14 is configured to determine the deterioration state of rechargeable battery 11 based on internal resistance value R1. The controller 14 is configured to correct the determination threshold TH based on the state of deterioration. Controller 14 is configured to correct resistance threshold TH1 based on the state of deterioration.

The controller 14 stores the internal resistance value R1 obtained by the first pulse discharge after the rechargeable battery 11 is replaced with a new one as the initial internal resistance value R0 in the memory 14M. The controller 14 compares the internal resistance value R1 with the initial internal resistance value R0 every time the internal resistance value R1 is calculated. The controller 14 may be configured to correct the determination threshold TH1 using the relationship between the initial internal resistance value R0 of the rechargeable battery 11 and the calculated value of internal resistance R1 corresponding to a fully charged state. , the current full charge capacity SOH (State of Health) of the rechargeable battery 11, or a well-known index of the degree of deterioration, etc. may be used to correct the determination threshold TH1.

Here, a coefficient for adjusting the feature amount used for correction may be used, and this coefficient may be determined based on at least one of load information and battery information. Thereby, the determination threshold TH can be corrected according to the state of deterioration of the rechargeable battery 11, and it is expected that a decrease in determination accuracy will be suppressed or prevented, or that the determination accuracy will be improved.

The controller 14 is configured to determine whether the rechargeable battery 11 is undercharged by comparing the calculated internal resistance value R1 with a determination threshold value TH (eg, resistance threshold value TH1). The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the internal resistance value R1 is greater than or equal to the resistance threshold value TH1. The controller 14 is configured to determine that the rechargeable battery 11 is not undercharged when the internal resistance value R1 is smaller than the resistance threshold TH1.

As shown in FIG. 1, the battery state determination device 13 includes a notification device 26. As shown in FIG. Notification device 26 is electrically connected to controller 14 . Notification device 26 is electrically connected to processor 14P and memory 14M via circuit board 14C and bus 14B. The controller 14 is configured to control the notification device 26 based on the result of the battery determination. The notification device 26 is operated by electricity supplied from the controller 14.

The notification device 26 is configured to notify the user that the rechargeable battery 11 is undercharged. Notification device 26 includes, for example, at least one of an indicator, a display, and a speaker. The controller 14 is configured to control the notification device 26 so that the notification device 26 notifies the user that the rechargeable battery 11 is undercharged.

The controller 14 is configured to generate an insufficient charge determination result when determining that the rechargeable battery 11 is insufficiently charged. The notification device is configured to notify the user that the rechargeable battery 11 is undercharged based on the undercharge determination result. For example, the notification device is configured to display that the rechargeable battery 11 is undercharged based on the insufficient charge determination result. Thereby, the user of the vehicle can recognize that the rechargeable battery 11 is insufficiently charged.

Further, the controller 14 transmits the insufficient charging determination result to the external device 30 via the communication unit 24 . The controller 14 transmits the insufficient charging determination result to the server 31 via the communication unit 24 . The controller 14 of the server 31 transmits the insufficient charging determination result to the user terminal 41 via the communication unit 36 . The controller 14 of the user terminal 41 displays on the display 44 that the rechargeable battery 11 is insufficiently charged. Thereby, the user of the battery state determination system 2 can recognize that the rechargeable battery 11 is insufficiently charged.

The operation of the battery condition determination system 2 will be explained with reference to FIGS. 3 to 5. As shown in FIGS. 4 and 5, the controller 14 of the battery condition determination device 13 is configured to execute the battery condition determination method described below. The controller 14 stores the battery state determination program in the memory 14M. That is, the computer readable storage medium stores the battery condition determination program. The battery condition determination program causes the computer to execute a battery condition determination method. The processor 14P of the controller 14 implements the battery state determination method described below by reading and executing the battery state determination program stored in the memory 14M.

As shown in FIG. 4, the battery state determination method includes acquiring, by the controller 14, an internal resistance value R1 calculated based on the current value and voltage value of the rechargeable battery 11 (for example, step S8); The controller 14 determines whether the rechargeable battery 11 is insufficiently charged based on the resistance value R1 and the determination threshold TH (for example, step S10).

Measurement of current values and voltage values is started by the current sensor 16 and the voltage sensor 18 (step S1). The presence or absence of information input is confirmed by the controller 14 (step S2). For example, the controller 14 confirms whether at least one of load information, battery information, and grace time has been input. If at least one of the load information, battery information, and grace time is input, at least one of the load information, battery information, and grace time is stored in the memory of the controller 14 (step S3). For example, when the type of vehicle (gasoline vehicle, hybrid vehicle, electric vehicle) is input as load information, the input vehicle type is stored in the memory of the controller 14. When information that can identify the rechargeable battery 11 (manufacturer, model number) is input as battery information, the input information is stored in the memory of the controller 14. If a grace period is input, the input grace period is stored in the memory of the controller 14. When battery information is input, the lowest voltage value VM, lowest current value AM, and estimated self-discharge amount are selected by the controller 14 based on the battery information and stored in the memory.

The controller 14 determines whether the load 12 is stopped (step S4). When the load 12 is stopped, the supply of electricity from the rechargeable battery 11 to the load 12 and the charging of the rechargeable battery 11 from the charging circuit 15 are stopped. When the load 12 is in operation, at least one of supplying electricity from the rechargeable battery 11 to the load 12 and charging the rechargeable battery 11 from the charging circuit 15 is performed. If the load 12 is not stopped, the confirmation of the input of information is repeated by the controller 14 (steps S2 to S4).

On the other hand, when the load 12 is stopped, the controller 14 starts calculating the integrated value of dark current (step S5). For example, the controller 14 calculates an integrated value of the current values measured by the current sensor 16. Further, the open circuit voltage OCV is acquired by the controller 14 (step S6). For example, the voltage value measured by the voltage sensor 18 while charging and discharging of the rechargeable battery 11 is stopped is stored in the memory of the controller 14 as the open circuit voltage OCV.

A determination threshold TH is calculated by the controller 14 (step S7). For example, the controller 14 calculates the resistance threshold TH1. Specifically, the starting limit resistance value RL corresponding to the starting limit discharge amount DL is calculated by the controller 14 based on the open circuit voltage OCV, the lowest voltage value VM, the lowest current value AM, and equation (2). The starting limit discharge amount DL is calculated by the controller 14 based on the relationship information RS indicating the relationship between the discharge amount of the rechargeable battery 11 and the internal resistance of the rechargeable battery 11 and the starting limit resistance value RL. The determination threshold TH is calculated by the controller 14 based on the discharge amount history information regarding the history of the discharge amount of the rechargeable battery 11 and the starting limit discharge amount DL. Based on the integrated dark current value per unit time and the estimated self-discharge amount per unit time, the controller 14 calculates the amount of discharge of the rechargeable battery 11 per unit time while the load 12 is stopped. The controller 14 calculates the differential discharge amount ΔD by multiplying the discharge amount per unit time by the grace period. The controller 14 calculates the discharge amount threshold DT by dividing the differential discharge amount ΔD from the starting limit discharge amount DL. The resistance threshold TH1 is calculated by the controller 14 based on the relationship information RS shown in FIG. 2 and the discharge amount threshold DT. In this way, the determination threshold value TH is calculated by the controller 14. The calculated determination threshold TH is stored in the memory of the controller 14.

When the starting limit resistance value RL is calculated in step S7, the lowest voltage value VM and the lowest current value AM acquired based on the battery information newly input in steps S2 and S3 are used. The resistance value RL is updated to a resistance value suitable for the rechargeable battery 11. That is, by using the updated starting limit resistance value RL, the determination threshold value TH is updated.

While the load 12 is stopped, the internal resistance value R1 of the rechargeable battery 11 is calculated by the controller 14 (step S8). Specifically, while the load 12 is stopped, the discharge circuit 19 performs pulse discharge of the rechargeable battery 11 at a predetermined frequency. While the load 12 is stopped, the controller 14 acquires the current A0 before discharging, the current A1 during discharging, the voltage V0 before discharging, and the voltage V1 during discharging. The internal resistance value R1 is calculated by the controller 14 based on the following equation (1) using the current A0 before discharging, the current A1 during discharging, the voltage V0 before discharging, and the voltage V1 during discharging. The calculated internal resistance value R1 is stored in the memory of the controller 14.

The determination threshold TH is corrected by the controller 14 (step S9). For example, the determination threshold TH is corrected by the controller 14 based on the internal resistance value R1 and the initial internal resistance value R0. The resistance threshold TH1 is corrected by the controller 14 based on the internal resistance value R1 and the initial internal resistance value R0.

The controller 14 determines whether the rechargeable battery 11 is undercharged by comparing the internal resistance value R1 with the determination threshold TH (step S10). If the internal resistance value R1 is less than the resistance threshold TH1, the controller 14 determines that the rechargeable battery 11 is not undercharged, and the controller 14 turns off the undercharge flag (steps S10 and S11). If the internal resistance value R1 is less than the resistance threshold TH1, the controller 14 determines whether the load 12 is stopped (step S12). If the load 12 is not stopped, the calculation of the dark current integrated value is stopped by the controller 14 (steps S12 and S13). On the other hand, if the load 12 is stopped, the process returns to step S6 (step S12).

If the internal resistance value R1 is equal to or greater than the resistance threshold value TH1 in step S10, the controller 14 determines that the rechargeable battery 11 is undercharged. Therefore, when the internal resistance value R1 is equal to or greater than the resistance threshold value TH1, the insufficient charge flag is turned ON (step S10 and step S14 in FIG. 5).

As shown in FIG. 5, the notification device notifies the user of the insufficient charge determination result BR indicating that the rechargeable battery 11 is insufficiently charged (step S15). The insufficient charging determination result BR is transmitted to the external device 30 (server 31) via the communication unit (step S16). The insufficient charging determination result is transmitted from the server 31 to the user terminal 41, and the insufficient charging determination result BR is displayed on the display of the user terminal 41 (step S17). In this way, the user of the battery state determination system 2 can know whether the rechargeable battery 11 is insufficiently charged.

As described above, the battery state determination system 2 and the battery state determination device 13 include the controller 14 configured to obtain the internal resistance value R1 calculated based on the current value and voltage value of the rechargeable battery 11. Equipped with The controller 14 is configured to determine whether the rechargeable battery 11 is undercharged based on the internal resistance value R1 and the determination threshold value TH.

In the battery state determination system 2 and the battery state determination device 13, the controller 14 determines whether the rechargeable battery 11 is undercharged based on the internal resistance value R1 and the determination threshold value TH, so that accurate charging is possible based on the internal resistance value R1. It is possible to determine whether the battery 11 is insufficiently charged. Therefore, the accuracy of determining whether the rechargeable battery 11 is insufficiently charged can be improved.

Further, the battery state determination method includes obtaining, by the controller 14, an internal resistance value R1 calculated based on the current value and voltage value of the rechargeable battery 11 (for example, step S8), and determining the internal resistance value R1 and the determination. The controller 14 determines whether the rechargeable battery 11 is insufficiently charged based on the threshold TH (for example, step S10).

In the battery state determination method, since the controller 14 determines whether the rechargeable battery 11 is undercharged based on the internal resistance value R1 and the determination threshold TH, it is possible to accurately determine whether the rechargeable battery 11 is undercharged based on the internal resistance value R1. Can be judged. Therefore, the accuracy of determining whether the rechargeable battery 11 is insufficiently charged can be improved.

In the embodiment described above, the controller 14 is configured to determine whether the rechargeable battery 11 is undercharged by comparing the internal resistance value R1 with the determination threshold TH. However, the controller 14 determines whether the rechargeable battery 11 is undercharged by comparing at least one of the internal resistance value R1, the amount of change in the internal resistance value R1, and the rate of change in the internal resistance value R1 with the determination threshold TH. It may be configured as follows.

For example, as shown in FIGS. 6 and 7, in the battery state determination system 2 according to the first modification, the controller 14 compares the amount of change ΔR in the internal resistance value R1 with the determination threshold TH to The battery may be configured to determine whether the battery is insufficiently charged. In this case, the determination threshold TH includes the difference threshold TH2. The controller 14 determines that the rechargeable battery 11 is undercharged when the amount of change ΔR in the internal resistance value R1, which is the difference between the internal resistance value R1 and the first reference resistance value R3, is larger than the difference threshold TH2. (Step S30). The controller 14 is configured to determine that the rechargeable battery 11 is not undercharged when the amount of change ΔR in the internal resistance value R1 is smaller than the difference threshold TH2. The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the amount of change ΔR in the internal resistance value R1 is equal to the difference threshold TH2. However, the controller 14 may be configured to determine that the rechargeable battery 11 is not undercharged when the amount of change ΔR in the internal resistance value R1 is equal to the difference threshold TH2.

As shown in FIG. 7, the controller 14 is configured to calculate the amount of change ΔR in the internal resistance value R1 (step S28). The controller 14 is configured to calculate the amount of change ΔR in the internal resistance value R1 based on the current value, the voltage value, and the first reference resistance value R3. For example, similar to the embodiments described above, the controller 14 is configured to calculate the internal resistance value R1 based on the current value and the voltage value. Further, the controller 14 is configured to calculate the amount of change ΔR in the internal resistance value R1 by subtracting the first reference resistance value R3 from the internal resistance value R1.

Further, the controller 14 is configured to calculate the difference threshold TH2 (step S27). The controller 14 is configured to calculate the difference threshold TH2 by subtracting the first reference resistance value R3 from the resistance threshold TH1.

The controller 14 is configured to correct the difference threshold TH2 (step S29). For example, the controller 14 is configured to correct the resistance threshold TH1 based on the internal resistance value R1 and the initial internal resistance value R0. The controller 14 is configured to calculate the difference threshold TH2 by subtracting the first reference resistance value R3 from the corrected resistance threshold TH1. In this way, the difference threshold TH2 is corrected.

When the amount of change ΔR in the internal resistance value R1 is larger than the corrected difference threshold TH2, the controller 14 determines that the rechargeable battery 11 is undercharged (step S30). When the amount of change ΔR in the internal resistance value R1 is smaller than the corrected difference threshold TH2, the controller 14 determines that the rechargeable battery 11 is not undercharged.

Further, as shown in FIGS. 8 and 9, in the battery state determination system 2 according to the second modification, the controller 14 compares the rate of change RR of the internal resistance value R1 with the determination threshold TH to The battery may be configured to determine whether the battery is insufficiently charged. In this case, the determination threshold TH includes the ratio threshold TH3. The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the rate of change RR of the internal resistance value R1, which is the ratio of the internal resistance value R1 to the second reference resistance value R4, is greater than the ratio threshold TH3. (Step S40). The controller 14 is configured to determine that the rechargeable battery 11 is not undercharged when the rate of change RR of the internal resistance value R1 is smaller than the ratio threshold TH3. The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the rate of change RR of the internal resistance value R1 is equal to the ratio threshold TH3. However, the controller 14 may be configured to determine that the rechargeable battery 11 is not undercharged when the rate of change RR of the internal resistance value R1 is equal to the ratio threshold TH3.

As shown in FIG. 9, the controller 14 is configured to calculate the rate of change RR of the internal resistance value R1 (step S38). The controller 14 is configured to calculate the rate of change RR of the internal resistance value R1 based on the current value, voltage value, and second reference resistance value R4. For example, similar to the embodiments described above, the controller 14 is configured to calculate the internal resistance value R1 based on the current value and the voltage value. The controller 14 is configured to calculate the amount of change ΔR in the internal resistance value R1 by subtracting the second reference resistance value R4 from the internal resistance value R1. Further, the controller 14 is configured to calculate the rate of change RR by dividing the amount of change ΔR by the second reference resistance value R4.

Further, the controller 14 is configured to calculate the ratio threshold TH3 (step S37). The controller 14 is configured to calculate the difference threshold TH2 by subtracting the second reference resistance value R4 from the resistance threshold TH1. Further, the controller 14 is configured to calculate the ratio threshold TH3 by dividing the difference threshold TH2 by the second reference resistance value R4.

The controller 14 is configured to correct the ratio threshold TH3 (step S39). For example, the controller 14 is configured to correct the resistance threshold TH1 based on the internal resistance value R1 and the initial internal resistance value R0. The controller 14 is configured to calculate the difference threshold TH2 by subtracting the second reference resistance value R4 from the corrected resistance threshold TH1. The controller 14 is configured to calculate the ratio threshold TH3 using the difference threshold TH2. In this way, the ratio threshold TH3 is corrected.

When the rate of change RR of the internal resistance value R1 is larger than the corrected ratio threshold TH3, the controller 14 determines that the rechargeable battery 11 is undercharged (step S40). When the rate of change RR of the internal resistance value R1 is smaller than the corrected ratio threshold TH3, the controller 14 determines that the rechargeable battery 11 is not undercharged.

Note that in the embodiment described above, steps S1 to S16 are executed in the battery condition determination device 13, but as explained below, at least a part of steps S1 to S16 are executed in the external device 30 (for example, the server 31). May be executed.

For example, in the battery state determination system 302 according to the third modification shown in FIG. 10, steps S10, S11, and S14 are executed in the server 331, as shown in FIGS. 11 and 12. As shown in FIG. 10, battery condition determination system 302 includes a battery condition determination device 313 and a user terminal 41. The battery state determination device 313 includes a battery management device 311 and a server 331. The basic configuration of the battery management device 311 is substantially the same as the basic configuration of the battery state determination device 13. The basic configuration of the server 331 is substantially the same as that of the server 31. Since the server 331 performs battery state determination, the server 331 may also be referred to as a battery state determination device.

As shown in FIG. 10, the battery state determination system 302 and the battery state determination device 313 include a controller 350. In the third modification, the controller 350 includes a first controller 332 included in one of the main device 10 and the external device 30, and a second controller 314 included in the other of the main device 10 and the external device 30. In the third modification, the first controller 332 is included in the server 331 and the second controller 314 is included in the main device 10. The first controller 332 has substantially the same configuration as the controller 32 of the server 31. The second controller 314 has substantially the same configuration as the controller 14 of the battery condition determination device 13.

A part of the battery state determination program is stored in the memory 32M of the first controller 332 of the server 331, and read by the processor 32P of the first controller 332, so that the server 331 executes steps S10, S11, and S14. .

The first controller 332 detects insufficient charging of the rechargeable battery 11 by comparing at least one of the internal resistance value R1, the amount of change ΔR of the internal resistance value R1, and the rate of change RR of the internal resistance value R1 with a determination threshold TH. configured to determine. In the third modification, the first controller 332 is configured to determine whether the rechargeable battery 11 is undercharged by comparing the internal resistance value R1 with the determination threshold TH. However, similarly to the first modification and the second modification, the first controller 332 determines at least one of the internal resistance value R1, the amount of change ΔR of the internal resistance value R1, and the rate of change RR of the internal resistance value R1. It may be configured to determine whether the rechargeable battery 11 is insufficiently charged by comparing it with a threshold value TH.

In the third modification, the first controller 332 is configured to transmit the insufficient charge determination result BR indicating that the rechargeable battery 11 is insufficiently charged to the second controller 314 . The second controller 314 is configured to notify the user of the battery state determination system 2 of the insufficient charge determination result BR. The second controller 314 is configured to control the notification device 26 so as to notify the user of the battery condition determination system 2 of the insufficient charge determination result BR.

As shown in FIGS. 10 to 12, the battery management device 311 obtains the internal resistance value R1 and the determination threshold value TH (eg, resistance threshold value TH1) by executing steps S1 to S9 (steps S1 to S9). The battery management device 311 transmits the internal resistance value R1 and the determination threshold value TH (for example, resistance threshold value TH1) to the server 331 (step S309). The server 331 determines whether the rechargeable battery 11 is insufficiently charged by executing step S10 (step S10). When determining that the rechargeable battery 11 is undercharged, the server 331 transmits the insufficient charging determination result BR to the battery management device 311 and the user terminal 41 (step S316). The notifying device 26 of the battery management device 311 notifies the insufficient charging of the rechargeable battery 11 based on the insufficient charging determination result BR (step S15). The user terminal 41 displays the insufficient charge of the rechargeable battery 11 based on the insufficient charge determination result BR (step S17).

Furthermore, in the battery state determination system 402 according to the fourth modification shown in FIG. 13, steps S7 to S11 and S14 are executed in the server 431, as shown in FIG. As shown in FIG. 13, the battery condition determination system 402 includes a battery condition determination device 413 and a user terminal 41. The battery state determination device 413 includes a battery management device 411 and a server 431. The basic configuration of the battery management device 411 is substantially the same as the basic configuration of the battery state determination device 13. The basic configuration of the server 431 is substantially the same as that of the server 31. Since the server 431 performs battery state determination, the server 431 may also be referred to as a battery state determination device.

As shown in FIG. 13, the battery state determination system 402 and the battery state determination device 313 include a controller 450. In the fourth modification, similarly to the third modification, the controller 450 includes a first controller 432 included in one of the main device 10 and the external device 30, and a second controller 432 included in the other of the main device 10 and the external device 30. controller 414. The first controller 432 is included in the server 431, and the second controller 414 is included in the main device 10. The first controller 432 has substantially the same configuration as the controller 32 of the server 31. The second controller 414 has substantially the same configuration as the controller 14 of the battery condition determination device 13.

A part of the battery state determination program is stored in the memory 32M of the first controller 432 of the server 431, and read by the processor 32P of the first controller 432, so that the server 431 executes steps S7 to S11 and S14.

The first controller 432 detects insufficient charging of the rechargeable battery 11 by comparing at least one of the internal resistance value R1, the amount of change ΔR of the internal resistance value R1, and the rate of change RR of the internal resistance value R1 with a determination threshold TH. configured to determine. In the fourth modification, the first controller 432 is configured to determine whether the rechargeable battery 11 is undercharged by comparing the internal resistance value R1 with the determination threshold TH. However, similarly to the first modification and the second modification, the first controller 432 determines at least one of the internal resistance value R1, the amount of change ΔR of the internal resistance value R1, and the rate of change RR of the internal resistance value R1. It may be configured to determine whether the rechargeable battery 11 is insufficiently charged by comparing it with a threshold value TH.

In the fourth modification, the first controller 432 is configured to transmit the insufficient charge determination result BR indicating that the rechargeable battery 11 is insufficiently charged to the second controller 414 . The second controller 414 is configured to notify the user of the battery state determination system 2 of the insufficient charge determination result BR. The second controller 414 is configured to control the notification device 26 so as to notify the user of the battery condition determination system 2 of the insufficient charge determination result BR.

As shown in FIGS. 13 to 15, the battery management device 411 executes steps S1 to S6 to obtain data (for example, , current value, voltage value, load information, battery information, and grace time). Data is transmitted from the battery management device 411 to the server 431 (step S409). The server 431 calculates the internal resistance value R1 and the determination threshold value TH (for example, the resistance threshold value TH1) based on the data acquired from the battery management device 411 (steps S7 to S9). The server 431 determines whether the rechargeable battery 11 is insufficiently charged by executing step S10 (step S10). When determining that the rechargeable battery 11 is insufficiently charged, the server 431 transmits the insufficiently charged determination result BR to the battery management device 411 and the user terminal 41 (step S416). The notification device 26 of the battery management device 411 notifies the insufficient charging of the rechargeable battery 11 based on the insufficient charging determination result BR (step S15). The user terminal 41 displays the insufficient charge of the rechargeable battery 11 based on the insufficient charge determination result BR (step S17).

Note that in the battery state determination systems 2, 302, and 402, the battery state determination method, and the battery state determination program according to the embodiment and the first to fourth modifications described above, the rechargeable battery 11 is forced to operate while the load 12 is stopped. Internal resistance value R1 is calculated by discharging the battery. However, the internal resistance value R1 is determined based on the current value and voltage value obtained when the rechargeable battery 11 supplies electricity to the load 12 while the load 12 is in operation (that is, when the rechargeable battery 11 discharges). It may be calculated.

Furthermore, in addition to the discharge amount, the horizontal axis in FIG. 2 may use the elapsed time, the number of days, or the state of charge (SOC) calculated from the initial capacity and discharge amount calculated in advance.

Further, in the above-described embodiments and modified examples, the controller 14 is based on the starting limit discharge amount DL, which is the limit discharge amount of the rechargeable battery 11 that can start the load 12 electrically connected to the rechargeable battery 11. It is configured to calculate a determination threshold TH. The controller 14 is configured to calculate the resistance threshold TH1 based on the starting limit discharge amount DL. However, the controller 14 may be configured to calculate the determination threshold TH based on the minimum voltage value VM required to start the load 12. In this case, the determination threshold TH includes the voltage threshold TH5. The controller 14 is configured to calculate the voltage threshold TH5 based on the lowest voltage value VM. The controller 14 is configured to calculate a differential voltage value ΔV corresponding to the above-described differential discharge amount ΔD, and calculate the voltage threshold TH5 by adding the differential voltage value ΔV to the lowest voltage value VM.

When the voltage threshold TH5 is used as the determination threshold TH, the controller 14 determines whether the rechargeable battery 11 is undercharged by comparing information regarding the voltage of the rechargeable battery 11 with the determination threshold TH (in this case, the voltage threshold TH5). configured to do so. The information regarding the voltage of the rechargeable battery 11 includes, for example, the discharge performance SOF (State of Function) of the rechargeable battery 11 and the slope of the discharge performance SOF.

When the discharge performance SOF is used as information regarding voltage, the controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the discharge performance SOF is smaller than the voltage threshold TH5. The controller 14 is configured to determine that the rechargeable battery 11 is not undercharged when the discharge performance SOF is greater than the voltage threshold TH5. The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the discharge performance SOF is equal to the voltage threshold TH5. However, the controller 14 may be configured to determine that the rechargeable battery 11 is not undercharged when the discharge performance SOF is equal to the voltage threshold TH5.

For example, the controller 14 is configured to calculate the discharge performance SOF based on the open circuit voltage OCV, the internal resistance value R1, and the minimum current value AM required to start the load 12. For example, the latest minimum current value is used as the minimum current value AM. The controller 14 is configured to calculate the discharge performance SOF based on the following equation (5).

SOF=OCV+R1×AM...(5)
Furthermore, when the slope of the discharge performance SOF (amount of change in the discharge performance SOF per unit time) is used as information regarding the voltage, the controller 14 calculates the discharge performance SOF at a predetermined period based on equation (5), The difference between the previous discharge performance SOF and the latest discharge performance SOF is calculated as the slope of the discharge performance SOF. The controller 14 is configured to determine whether the rechargeable battery 11 is undercharged by comparing the slope of the discharge performance SOF with a determination threshold TH (for example, slope threshold TH6). Specifically, the controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the slope of the discharge performance SOF is greater than the slope threshold TH6. The controller 14 is configured to determine that the rechargeable battery 11 is not undercharged when the slope of the discharge performance SOF is smaller than the slope threshold TH6. The controller 14 is configured to determine that the rechargeable battery 11 is undercharged when the slope of the discharge performance SOF is equal to the slope threshold TH6. However, the controller 14 may be configured to determine that the rechargeable battery 11 is not undercharged when the slope of the discharge performance SOF is equal to the slope threshold TH6.

The battery condition determination systems 2, 302, and 402, the battery condition determination method, and the battery condition determination program according to the embodiment and the first to fourth modifications described above collect data from various users, and collect threshold values and related information ( The system may be configured to learn to improve the accuracy of information such as relational expressions, maps, etc.).

In the third and fourth variations described above, the external device 30 receives information only from the main device 10, but the external device 30 receives information from a plurality of main devices and uses the information to determine the internal resistance value. At least one learning process of the determination threshold and the determination threshold may be performed. In this case, for example, as shown in FIG. 16, the external device 30 includes a first controller 432. The first controller 432 is configured to acquire calculation information INF used to calculate at least one of the internal resistance value R1 and the determination threshold TH from the plurality of main devices 10A and 10B. The first controller 432 is configured to perform learning processing based on the calculation information INF. For example, the first controller 432 sends data (for example, current value, voltage value, load information, battery information, and grace time) are acquired from the main devices 10A and 10B as calculation information INF. The first controller 432 calculates at least one of the discharge amount and internal resistance value for each type of rechargeable battery 11 based on the calculation information INF acquired from the main devices 10A and 10B, or calculates at least one of the discharge amount and internal resistance value for each type of rechargeable battery 11, or By acquiring at least one of the discharge amount and internal resistance value for each type of rechargeable battery 11, relationship information RS indicating the relationship between the discharge amount of the rechargeable battery 11 and the internal resistance of the rechargeable battery 11 is obtained. (For example, see FIG. 2), the learning process is executed and the relationship information RS is updated. The first controller 432 calculates the determination threshold TH using the updated relationship information RS. Thereby, the calculation accuracy of at least one of the internal resistance value R1 and the determination threshold value TH can be increased based on the data acquired from the plurality of vehicles 10A and 10B, and the determination accuracy of insufficient charging can be improved more reliably. The modification shown in FIG. 16 is also applicable to the third modification shown in FIG. 10 and other modifications. Further, the total number of vehicles may be three or more.

Furthermore, in the battery condition determination systems 2, 302, and 402, battery condition determination methods, and battery condition determination programs according to the embodiment and the first to fourth modifications described above, information regarding the starting limit (for example, the starting limit discharge amount DL , minimum voltage value VM, minimum current value AM, etc.), the controller 14 calculates and/or stores information regarding the starting limit from multiple devices (multiple main devices or multiple external devices). A necessary numerical value may be calculated using the acquired information regarding the starting limit to determine whether charging is insufficient. For example, the controller 14 calculates the internal resistance value R1 from a formula for calculating the discharge performance SOF based on information regarding the starting limit obtained from a plurality of main devices, and calculates the starting limit discharge amount using a relational expression and related information such as a map. DL may also be calculated. In addition, the first controller 432 holds the discharge amount and current voltage at the starting limit, which are measured in advance as a reference, and measures the current and voltage at the time of starting each vehicle, and shows the relationship between them and the reference. The starting limit discharge amount DL of the vehicle may be determined using the amount. Furthermore, the resistance threshold TH1 may be calculated using the above-mentioned relational information RS using the starting limit discharge amount DL or a value obtained by adding the discharge amount threshold DT to the starting limit discharge amount DL.

In addition to the servers 31, 331 and 431, in the battery state determination systems 2, 302 and 402, the battery state determination method, and the battery state determination program according to the above-described embodiment and the first to fourth modifications, A separate server may be provided that performs some of the processing of the method.

Furthermore, by combining at least two of the flowcharts shown in FIGS. 4, 7, and 9, at least one of the internal resistance value R1, the amount of change ΔR of the internal resistance value R1, and the rate of change RR of the internal resistance value R1 can be adjusted. The controller 14 may be configured to determine whether the rechargeable battery 11 is insufficiently charged by comparing it with the determination threshold TH. For example, by combining the flowcharts shown in FIG. 4, FIG. 7, and FIG. Controller 14 may be configured to determine if rechargeable battery 11 is undercharged. By combining the flowcharts shown in FIGS. 4 and 7, the controller 14 can be configured to determine whether the rechargeable battery 11 is undercharged by comparing the internal resistance value R1 and the amount of change ΔR in the internal resistance value R1 with the determination threshold TH. Can be configured. By combining the flowcharts shown in FIGS. 4 and 9, the controller 14 is configured to determine whether the rechargeable battery 11 is undercharged by comparing the internal resistance value R1 and the rate of change RR of the internal resistance value R1 with the determination threshold TH. Can be configured. By combining the flowcharts shown in FIGS. 7 and 9, insufficient charging of the rechargeable battery 11 can be determined by comparing the amount of change ΔR of the internal resistance value R1 and the rate of change RR of the internal resistance value R1 with the determination threshold TH. Controller 14 may be configured to:

Note that the battery condition determination systems 2, 302, and 402, the battery condition determination method, and the battery condition determination program according to the embodiment and the first to fourth modifications described above are applicable to, for example, a vehicle owned by an individual or a rental car. It is applicable to vehicles used for car sharing and vehicles used for car sharing. When at least one of the battery state determination systems 2, 302, and 402 is applied to a vehicle owned by an individual, for example, the user terminal 41 detects an insufficient charge of the rechargeable battery 11 installed in the vehicle by the vehicle owner or driver. used to monitor. When at least one of the battery state determination systems 2, 302, and 402 is applied to a vehicle used as a rental car, for example, the user terminal 41 is configured by the rental car company and its staff to detect the rechargeable battery 11 installed in the rented vehicle. used to monitor insufficient charging. Furthermore, when at least one of the battery condition determination systems 2, 302, and 402 is applied to a vehicle used for car sharing, for example, the user terminal 41 can be used by the car sharing company and its staff to This is used to monitor whether the rechargeable battery 11 is undercharged.

Furthermore, the battery condition determination systems 2, 302, and 402, battery condition determination methods, and battery condition determination programs according to the embodiment and the first to fifth modifications described above are also applicable to devices other than vehicles. For example, it can also be used to monitor the rechargeable battery 11 that stores electricity generated by a solar power generation system or the like.

Note that in this application, "comprise" and its derivatives are non-limiting terms that describe the presence of a component, and do not exclude the presence of other components that are not described. This also applies to "comprises," "includes," and their derivatives.

In this application, ordinal numbers such as "first" and "second" are simply terms for identifying configurations and do not have any other meaning (eg, specific order, etc.). For example, the presence of a "first element" does not imply the existence of a "second element," and the presence of a "second element" does not imply the existence of a "first element." It does not imply that "element" is present.

Terms such as "substantially," "about," and "approximately" expressing degrees may mean a reasonable amount of deviation such that the final result does not significantly change. All numerical values set forth in this application may be construed to include terms such as "substantially," "about," and "approximately."

Furthermore, the expression "at least one of A and B" in the present disclosure includes, for example, (1) only A, (2) only B, and (3) both A and B. . The expression "at least one of A, B, and C" includes, for example, (1) only A, (2) only B, (3) only C, (4) A and B, (5) B and C, (6) A and C, and (7) all of A, B and C are included. In this disclosure, the expression "at least one of A and B" is not interpreted as "at least one of A and at least one of B."

Obviously, various changes and modifications of the present invention are possible in light of the above disclosure. Therefore, the present invention may be implemented in a manner other than the specific disclosure of the present application without departing from the spirit of the present invention.

2, 302, 402: Battery status determination system 10: Main unit 11: Rechargeable battery 12: Load 13, 313, 413: Battery status determination device 14, 350, 450: Controller 15: Charging circuit 16: Current sensor 18: Voltage Sensor 19: Discharge circuit 20: Interface 30: External device 31, 331, 431: Server 32: Controller 41: User terminal 42: Controller 311: Battery management device 332, 432: First controller 314, 414: Second controller TH: Judgment threshold TH1: Resistance threshold TH2: Difference threshold TH3: Ratio threshold

Claims (22)

a controller configured to obtain an internal resistance value calculated based on a current value and a voltage value of the rechargeable battery;
The controller is configured to determine whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold.
Battery status determination system. The controller is configured to calculate the determination threshold based on a starting limit discharge amount that is a limit discharge amount of the rechargeable battery that can start a load electrically connected to the rechargeable battery.
The battery condition determination system according to claim 1. The controller initiates the start-up based on an open circuit voltage of the rechargeable battery, a minimum voltage value of the rechargeable battery required to start the load, and a minimum current value of the rechargeable battery required to start the load. configured to calculate a starting limit resistance value corresponding to the limit discharge amount;
The battery condition determination system according to claim 2. The controller is configured to calculate the starting limit discharge amount based on relationship information indicating a relationship between the discharge amount of the rechargeable battery and the internal resistance of the rechargeable battery, and the starting limit resistance value. Ru,
The battery condition determination system according to claim 3. The controller is configured to calculate the determination threshold based on the discharge amount history information regarding the history of the discharge amount of the rechargeable battery and the starting limit discharge amount.
The battery condition determination system according to claim 4. The controller is configured to update the determination threshold based on at least one of load information regarding a load electrically connected to the rechargeable battery and battery information regarding the rechargeable battery.
The battery condition determination system according to claim 1. The controller determines the insufficient charge of the rechargeable battery by comparing at least one of the internal resistance value, the amount of change in the internal resistance value, and the rate of change in the internal resistance value with the determination threshold value. composed of
The battery condition determination system according to claim 1. The determination threshold includes a resistance threshold,
the controller is configured to determine that the rechargeable battery is undercharged if the internal resistance value is greater than the resistance threshold;
The battery condition determination system according to claim 1. The determination threshold includes a difference threshold,
The controller determines that the rechargeable battery is undercharged when the amount of change in the internal resistance value, which is a difference between the internal resistance value and a first reference resistance value, is larger than the difference threshold. composed of
The battery condition determination system according to claim 1. The determination threshold includes a ratio threshold,
The controller is configured to determine that the rechargeable battery is undercharged when the rate of change in the internal resistance value, which is a ratio of the internal resistance value to a second reference resistance value, is greater than the ratio threshold. be done,
The battery condition determination system according to claim 1. The controller adjusts the internal resistance based on the current value and the voltage value obtained when the rechargeable battery is discharged multiple times while the rechargeable battery stops supplying electricity to the load. configured to calculate a value;
The battery condition determination system according to claim 1. The controller is configured to determine a state of deterioration of the rechargeable battery based on the internal resistance value,
The controller is configured to correct the determination threshold based on the deterioration state.
The battery condition determination system according to claim 1. a current sensor electrically connected to the controller and configured to measure the current value of the rechargeable battery;
further comprising: a voltage sensor electrically connected to the controller and configured to measure the voltage value of the rechargeable battery;
The battery condition determination system according to claim 1. a main unit including a load electrically connected to the rechargeable battery;
an external device;
at least one of the main body device and the external device includes at least a portion of the controller;
The battery condition determination system according to claim 1. The controller includes a first controller included in one of the main device and the external device, and a second controller included in the other of the main device and the external device,
The first controller determines the insufficient charge of the rechargeable battery by comparing at least one of the internal resistance value, the amount of change in the internal resistance value, and the rate of change in the internal resistance value with the determination threshold value. configured to determine,
The battery condition determination system according to claim 14. The first controller is configured to transmit an undercharge determination result indicating that the rechargeable battery is undercharged to the second controller.
The battery condition determination system according to claim 15. The second controller is configured to notify a user of the battery state determination system of the insufficient charge determination result.
The battery condition determination system according to claim 16. The external device includes the first controller,
The first controller is configured to acquire calculation information used to calculate at least one of the internal resistance value and the determination threshold from a plurality of main devices,
The first controller is configured to perform a learning process based on the calculation information.
The battery condition determination system according to claim 15. a controller configured to obtain an internal resistance value calculated based on a current value and a voltage value of the rechargeable battery;
The controller is configured to determine whether the rechargeable battery is undercharged based on the internal resistance value and the determination threshold.
Battery status determination device. acquiring, by a controller, an internal resistance value calculated based on a current value and a voltage value of the rechargeable battery; and determining, by the controller, whether the rechargeable battery is undercharged based on the internal resistance value and a determination threshold value. ,
A battery state determination method comprising: causing a computer to execute the battery state determination method according to claim 20;
Battery status determination program. storing the battery state determination program according to claim 21;
A computer-readable storage medium.

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