Management device, vehicle management system, vehicle management method, and computer-readable recording medium having program recorded thereon

Abstract

The present disclosure provides a management device, a vehicle management system, a vehicle management method, and a computer-readable recording medium having a program recorded thereon. The battery management device of the vehicle management system is mounted on a vehicle and is arranged in a battery box for storing batteries, and the battery management device comprises: a voltage sensor for detecting the voltage value of the battery; a current sensor for detecting the current value of the battery; and a battery monitoring integrated circuit for being connected to the voltage sensor and the current sensor in a communicable manner and outputting a signal indicating the voltage value obtained from the voltage sensor and a signal indicating the current value obtained from the current sensor to a battery control device.

Description

Technical Field

[0001] The present disclosure relates to a management device, a vehicle management system, a vehicle management method, and a computer-readable recording medium having a program recorded thereon. Background Art

[0002] The control device of the battery can achieve more reliable control by setting it as a redundant structure. However, when all the microcomputers related to the control of the battery are set as a redundant structure, the number of microcomputers will increase, making the device complicated, which is related to the cost increase. Therefore, the following technology is considered, that is, the detection unit that detects the state quantity of the battery and the control unit that controls the battery are separated, and the microcomputer is only set in the control unit. For example, Japanese Patent Gazette No. 2018-44795 discloses a battery diagnostic device, which includes multiple detection units for detecting the voltage of multiple battery packs, and a control unit for controlling the multiple detection units.

[0003] When measuring the internal resistance, the current needs to be acquired at the same timing as the voltage. When the current is acquired using an integrated circuit different from the voltage sensor, they need to be synchronized so that there is no time lag in the timing of acquiring the voltage and current. Summary of the invention

[0004] The present disclosure aims to provide a management device, a vehicle management system, a vehicle management method, and a computer-readable recording medium having a program recorded thereon, which are capable of acquiring a voltage value and a current value of a battery using one integrated circuit.

[0005] Means for solving problems

[0006] The first method is a vehicle management device, which is mounted on the vehicle and arranged in a shell that stores a battery, and manages the battery. The vehicle management device includes: a voltage sensor that detects the voltage value of the battery; a current sensor that detects the current value of the battery; an integrated circuit that is connected to the voltage sensor and the current sensor in a communicative manner, and outputs a signal representing the voltage value obtained from the voltage sensor and a signal representing the current value obtained from the current sensor to an external control device.

[0007] In the management device of the first mode, the voltage sensor detects the voltage value of the battery. The current sensor detects the current value of the battery. The integrated circuit outputs a signal indicating the voltage value obtained from the voltage sensor and a signal indicating the current value obtained from the current sensor to an external control device. Thus, the voltage value and the current value of the battery can be obtained using one integrated circuit. In addition, being connected to the voltage sensor and the current sensor in a communicable manner means that the voltage sensor and the current sensor are directly or indirectly connected to the integrated circuit.

[0008] The management device of the second embodiment is the management device of the first embodiment, further comprising a storage unit, the storage unit being connected to the integrated circuit in a communicable manner and storing information related to the storage battery, and the storage unit being connected to the external control device in a communicable manner via the integrated circuit. Thus, the information related to the storage battery stored in the storage unit can be further obtained using one integrated circuit. In addition, the information related to the storage battery includes information related to the type of the storage battery or information related to the deterioration condition of the storage battery.

[0009] The management device of the third aspect is that, in the management device of the second aspect, a multiplexer is further provided, wherein the multiplexer is connected to the current sensor, the storage unit, and the integrated circuit, and can switch the object that can communicate with the integrated circuit to either the current sensor or the storage unit, and the multiplexer switches the object that can communicate with the integrated circuit to the current sensor when the ignition switch of the vehicle is turned on, and switches the object that can communicate with the integrated circuit to the storage unit when the ignition switch of the vehicle is turned off. Thus, the number of communication lines connected to the integrated circuit can be suppressed, and the voltage value and current value of the battery and the information related to the battery stored in the storage unit can be obtained.

[0010] The fourth mode is a vehicle management system, comprising the management device of the third mode and the external control device, wherein the external control device detects the state of the multiplexer based on the signal outputted via the multiplexer and the integrated circuit when the ignition switch of the vehicle is turned on. Thus, it is possible to detect whether the state of the multiplexer is abnormal or normal. In addition, the state of the multiplexer includes a case where the multiplexer is in an abnormal state.

[0011] The fifth mode is a vehicle management system, comprising the management device of the third mode and the external control device, wherein the external control device switches the communication speed with the management device according to whether the information is read from the storage unit via the integrated circuit and the multiplexer or the current value is obtained from the current sensor via the integrated circuit and the multiplexer. Thus, even if the communication speed when reading information from the storage unit is different from the communication speed when obtaining the current value from the current sensor, it can be handled.

[0012] The sixth mode is a vehicle management system, which includes any one of the management devices of the first mode to the third mode, and the external control device, wherein the storage battery has a plurality of cells, and the external control device sequentially performs the following processing and judges the state of the storage battery of each cell, the processing being: obtaining the respective voltage values ​​of a part of the cells from the voltage sensor; obtaining the current value from the current sensor; and obtaining the voltage values ​​of the remaining cells from the voltage sensor. Thus, the difference between the timing of obtaining the voltage value and the timing of obtaining the current value can be suppressed, so that the state of the storage battery of each cell can be judged with high accuracy. In addition, the state of the storage battery includes a case where the storage battery is in an abnormal state.

[0013] The seventh mode is a vehicle management method, which is a vehicle management method in a vehicle management system, wherein the vehicle management system includes a management device of the third mode and the external control device, and in the vehicle management method, the external control device detects the state of the multiplexer based on a signal outputted via the multiplexer and the integrated circuit when the ignition switch of the vehicle is turned on. Thus, it is possible to detect whether the state of the multiplexer is abnormal or normal.

[0014] The eighth mode is a vehicle management method, which is a vehicle management method in a vehicle management system, and the vehicle management system includes a management device of the third mode and the external control device, in which the external control device switches the communication speed with the management device according to whether the information is read from the storage unit via the integrated circuit and the multiplexer or the current value is obtained from the current sensor via the integrated circuit and the multiplexer. Thus, even if the communication speed when reading information from the storage unit is different from the communication speed when obtaining the current value from the current sensor, it can be handled.

[0015] The ninth mode is a vehicle management method, which is a vehicle management method in a vehicle management system, wherein the vehicle management system includes any one of the management devices in the first mode to the third mode, and the external control device, and the storage battery has a plurality of cells. In the vehicle management method, the external control device sequentially performs the following processing and judges the state of the storage battery of each cell, wherein the processing is: obtaining the respective voltage values ​​of a part of the cells from the voltage sensor; obtaining the current value from the current sensor; and obtaining the voltage values ​​of the remaining cells from the voltage sensor. Thus, the difference between the timing of obtaining the voltage value and the timing of obtaining the current value can be suppressed, so that the state of the storage battery of each cell can be judged with high accuracy.

[0016] A tenth aspect is a computer-readable recording medium having a program recorded thereon, wherein the program is for causing a computer to function as the external control device in any one of the vehicle management systems of the fourth to sixth aspects.

[0017] According to the present disclosure, the voltage value and the current value of the battery can be obtained using one integrated circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Exemplary embodiments of the present disclosure are described in detail based on the following drawings, in which:

[0019] Figure 1 It is a diagram showing a configuration example of a vehicle management system according to an embodiment of the present disclosure.

[0020] Figure 2 It is a diagram showing a configuration example of a battery control device of a vehicle management system according to an embodiment of the present disclosure.

[0021] Figure 3 This is a flowchart showing a process when the ignition switch is turned on according to the embodiment of the present disclosure.

[0022] Figure 4 This is a flowchart showing a process when the ignition switch is off according to the embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] As an example, the vehicle management system of the present disclosure can be installed on a vehicle that adopts a redundant power supply system and can switch between manual driving and automatic driving. Below, regarding one embodiment of the present disclosure, a case where the vehicle is installed on a vehicle that can switch between manual driving and automatic driving is cited as an example, and is described in detail with reference to the accompanying drawings.

[0024] <Implementation Method>

[0025] [structure]

[0026] Figure 1 This is a functional block diagram of a vehicle management system 100 according to an embodiment of the present disclosure. The vehicle management system 100 includes a battery control device 10 and a battery box 20. The battery box 20 is connected to the battery control device 10 in a communicable manner via an in-vehicle network such as a CAN (Controller Area Network) and is controlled by the battery control device 10.

[0027] (1) Battery box

[0028] The battery box 20 is a housing for housing the battery 21, and is connected to the battery control device 10 in a replaceable manner. The battery box 20 includes the battery 21 and a battery management device 22. The battery management device 22 includes a voltage sensor 23, a current sensor 24, a storage unit 25, a multiplexer 26, a temperature sensor 27, and a battery monitoring integrated circuit (IC: Integrated Circuit) 28.

[0029] The battery 21 is a secondary battery such as a lead-acid battery or a lithium battery that is configured to be rechargeable. The battery 21 can supply its stored power to an electronic device or an electrical component (not shown) called an ECU (Electronic Control Unit) based on the control of the battery control device 10. When applied to a vehicle that can switch between manual driving and automatic driving, the battery 21 can be used as a sub-battery to support the main battery during automatic driving.

[0030] The voltage sensor 23 detects the voltage value of the storage battery 21 . The storage battery 21 has a plurality of cells, and the voltage sensor 23 detects the voltage value of each cell of the storage battery 21 .

[0031] The current sensor 24 detects the current value of the battery 21 .

[0032] The storage unit 25 stores, for example, identification information and ignition-ON accumulated time as information related to the battery 21 built into the same battery box 20. The storage unit 25 may use a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory).

[0033] The identification information is information that can identify the type of the storage battery 21, and is a unique value that is pre-assigned according to the type of the storage battery 21. The identification information is stored in the storage unit 25 in a manner corresponding to the storage battery 21 built in the battery box 20 when it is manufactured. For example, an identification ID (Identification) can be used for the identification information.

[0034] The IG-ON accumulated time is information obtained by accumulating the time during which the vehicle's power system is operating, that is, the ignition is on, from the time when the battery box 20 with the built-in battery 21 is mounted on the vehicle to the current time point. The accumulated time is updated to a new value at the timing of the ignition off (IG-OFF) when the power system stops, for example.

[0035] The multiplexer 26 is a circuit that is connected to the current sensor 24, the storage unit 25, and the battery monitoring integrated circuit 28 and can switch the object that can communicate with the battery monitoring integrated circuit 28 to either the current sensor 24 or the storage unit 25. The multiplexer 26 switches the object that can communicate with the battery monitoring integrated circuit 28 to either the current sensor 24 or the storage unit 25 under the control of the battery control device 10.

[0036] The temperature sensor 27 detects the temperature of the storage battery 21 . The storage battery 21 has a plurality of cells, and the temperature sensor 27 detects the temperature of each cell of the storage battery 21 .

[0037] The battery monitoring integrated circuit 28 obtains the state (voltage value, current value, temperature, etc.) of the battery 21. The battery monitoring integrated circuit 28 obtains a signal indicating the current value of the battery 21 via the multiplexer 26. In addition, the battery monitoring integrated circuit 28 can read identification information or IG-ON accumulated time from the storage unit 25 via the multiplexer 26, or update the IG-ON accumulated time stored in the storage unit 25. In addition, the battery monitoring integrated circuit 28 is typically configured as a circuit that integrates the functions of a unit for acquiring the voltage value, current value, and temperature of the battery 21 detected by various sensors, and a communication unit that communicates with the battery control device 10 via a communication port. The state of the battery 21, identification information, IG-ON accumulated time, etc. are sent from the battery monitoring integrated circuit 28 to the battery control device 10.

[0038] (2) Battery control device

[0039] The battery control device 10 is an electronic device that manages the control of the battery box 20. Figure 2As shown in FIG. 1 , the battery control device 10 is configured to include a CPU (Central Processing Unit) 10A, a ROM (Read Only Memory) 10B, a RAM (Random Access Memory) 10C, a storage 10D, and a communication I / F (Inter-Face) 10E. The CPU 10A, the ROM 10B, the RAM 10C, the storage 10D, and the communication I / F 10E are connected together via a bus 10F so as to be able to communicate with each other. In addition, the CPU 20A is an example of a processor.

[0040] The CPU 10A is a central processing unit and executes various programs or controls various components. Specifically, the CPU 10A reads a control program 110 from the memory 10D and executes the program using the RAM 10C as a work area.

[0041] The ROM 10B stores various programs and various data. The RAM 10C temporarily stores programs or data as a work area. The storage 10D stores a control program 110 .

[0042] The communication I / F 10E is an interface for connecting to other devices and uses a communication standard based on CAN (Controller Area Network) or Ethernet (registered trademark).

[0043] The CPU 10A reads and executes the control program 110 stored in the memory 10D, thereby realizing the functions of the storage unit 11 , the abnormality detection unit 12 , and the operation control unit 13 described later.

[0044] The storage unit 11 stores identification information, IG-ON cumulative time, and abnormality detection results as information related to the battery box 20 connectable to the battery control device 10 .

[0045] The identification information is information used in a comparison process for determining whether the battery box 20 connected to the battery control device 10 is a predetermined regular battery box.

[0046] The IG-ON cumulative time is updated every time the IG-ON cumulative time is written into the storage unit 25 by the operation control unit 13 .

[0047] The storage unit 11 is set to output the identification information and the IG-ON cumulative time as 0V and 5V signals.

[0048] The abnormality detection result is a result of an abnormality detection process performed by the abnormality detection unit 12 described later. The abnormality detection result is updated every time the abnormality detection process is performed by the abnormality detection unit 12.

[0049] The abnormality detection unit 12 controls the multiplexer 26 so that the object that can communicate with the battery monitoring integrated circuit 28 is switched to the current sensor 24 when the ignition switch of the vehicle is turned on. In addition, the abnormality detection unit 12 sequentially performs the following processes, namely, obtaining the voltage values ​​of each of the cells of a part of the battery 21 from the voltage sensor 23 via the battery monitoring integrated circuit 28; obtaining the current value from the current sensor 24 via the battery monitoring integrated circuit 28 and the multiplexer 26; and obtaining the voltage value of the remaining cells from the voltage sensor 23 via the battery monitoring integrated circuit 28. The abnormality detection unit 12 detects the abnormal state of each cell of the battery 21.

[0050] The current sensor 24 is configured so that the voltage level of the signal indicating the current value obtained from the current sensor 24 is within the normal range (0 V to 3 V), for example. If the level of the signal indicating the current value obtained from the current sensor 24 is outside the normal range, the abnormality detection unit 12 detects that the multiplexer 26 is in an abnormal state because the signal is obtained from the storage unit 25.

[0051] The abnormality detection unit 12 controls the multiplexer 26 so that the object that can communicate with the battery monitoring integrated circuit 28 is switched to the storage unit 25 when the ignition switch of the vehicle is turned off. In addition, the abnormality detection unit 12 reads the identification information and the IG-ON accumulated time from the storage unit 25 via the battery monitoring integrated circuit 28 and the multiplexer 26, and performs a comparison process to check whether they are consistent with the identification information and the IG-ON accumulated time stored in the storage unit 11.

[0052] When the identification information read from the storage unit 25 of the battery box 20 is inconsistent with the identification information stored in the storage unit 11, the abnormality detection unit 12 detects that the storage unit 25 is in an abnormal state. In addition, when the IG-ON cumulative time read from the storage unit 25 of the battery box 20 is inconsistent with the IG-ON cumulative time stored in the storage unit 11, the abnormality detection unit 12 detects that the storage unit 25 is in an abnormal state.

[0053] Normally, when the battery box 20 is not replaced and is still used, the operation time of the vehicle power system is accumulated, so the IG-ON accumulated time is necessarily increased from the previous value. However, if the storage unit 25 becomes abnormal at a certain time and the IG-ON accumulated time of the storage unit 25 is not updated, the IG-ON accumulated time read from the storage unit 25 of the battery box 20 and the IG-ON accumulated time stored in the storage unit 11 will become inconsistent.

[0054] The operation control unit 13 switches the communication speed with the battery management device 22 depending on whether it is reading information from the storage unit 25 via the battery monitoring IC 28 and the multiplexer 26 or acquiring a current value from the current sensor 24 via the battery monitoring IC 28 and the multiplexer 26 .

[0055] For example, since the communication speed of the battery monitoring integrated circuit 28 is 1000 Kbps and the communication speed of the storage unit 25 is 800 Kbps, the operation control unit 13 switches the communication speed with the battery management device 22 to 800 Kbps when the ignition switch is turned off and information is read from the storage unit 25. In addition, when the ignition switch is turned on and the current value is obtained from the current sensor 24, the operation control unit 13 switches the communication speed with the battery management device 22 to 1000 Kbps.

[0056] (deal with)

[0057] Figure 3 This is a flowchart for explaining the processing performed by the battery control device 10 which is started when the ignition switch of the vehicle is turned on. Figure 3 The processing contents will be described.

[0058] First, in step S101 , the abnormality detection unit 1 controls the multiplexer 26 so as to switch the object that can communicate with the battery monitoring integrated circuit 28 to the current sensor 24 .

[0059] In step S102 , the operation control unit 13 switches the communication speed with the battery management device 22 to a communication speed (eg, 1000 Kbps) for acquiring the current value from the current sensor 24 .

[0060] In step S103 , the abnormality detection unit 12 obtains the voltage value of each of the cells of a part of the battery 21 from the voltage sensor 23 via the battery monitoring integrated circuit 28 .

[0061] In step S104 , the abnormality detection unit 12 obtains a signal indicating a current value from the current sensor 24 via the battery monitoring integrated circuit 28 and the multiplexer 26 .

[0062] In step S105, the abnormality detection unit 12 determines whether the voltage level of the signal obtained in step S104 is within the normal range. If the voltage level of the signal obtained in step S104 is within the normal range (0V to 3V), the process proceeds to step S107. On the other hand, if the voltage level of the signal obtained in step S104 is outside the normal range (0V to 3V), the process proceeds to step S106 because the signal is obtained from the storage unit 25.

[0063] In step S106, the abnormality detection unit 12 outputs a multiplexer abnormality signal indicating that the multiplexer 26 is in an abnormal state, stores the fact that the multiplexer 26 is in an abnormal state in the storage unit 11, and ends the process.

[0064] In step S107 , the abnormality detection unit 12 obtains the voltage value of the remaining battery cell from the voltage sensor 23 via the battery monitoring integrated circuit 28 .

[0065] In step S108 , the abnormality detection unit 12 detects the abnormal state of each cell of the storage battery 21 based on the voltage values ​​acquired in steps S103 and S107 and the current value acquired in step S104 .

[0066] In step S109, the abnormality detection unit 12 determines whether or not it has detected that at least one cell of the storage battery 21 is in an abnormal state. If the abnormality detection unit 12 has detected that at least one cell of the storage battery 21 is in an abnormal state, in step S110, the abnormality detection unit 12 outputs a battery abnormality signal indicating that the storage battery 21 is in an abnormal state, stores the abnormal state of the storage battery 21 in the storage unit 11, and ends the process. On the other hand, if at least one cell of the storage battery 21 is not detected to be in an abnormal state, the process ends.

[0067] Figure 4 This is a flowchart for explaining the processing performed by the battery control device 10 which is started when the ignition switch of the vehicle is turned off. Figure 4 The processing contents will be described.

[0068] First, in step S120 , the abnormality detection unit 12 controls the multiplexer 26 so as to switch the communication target with the battery monitoring integrated circuit 28 to the storage unit 25 .

[0069] In step S121 , the operation control unit 13 switches the communication speed with the battery management device 22 to the communication speed (for example, 800 Kbps) for reading information from the storage unit 25 .

[0070] In step S122 , the operation control unit 13 writes the updated IG-ON cumulative time to the storage unit 25 of the battery box 20 via the battery monitoring IC 28 and the multiplexer 26 , and stores the updated IG-ON cumulative time in the storage unit 11 .

[0071] In step S123 , the abnormality detection unit 12 reads the identification information and the IG-ON cumulative time from the storage unit 25 via the battery monitoring integrated circuit 28 and the multiplexer 26 .

[0072] In step S124, the abnormality detection unit 12 compares the identification information and IG-ON cumulative time read out in step S123 with the identification information and IG-ON cumulative time stored in the storage unit 11, thereby detecting the abnormal state of the storage unit 25 of the battery box 20. For example, when the identification information read out in step S123 and the identification information stored in the storage unit 11 are inconsistent, or when the IG-ON cumulative time read out in step S123 and the IG-ON cumulative time stored in the storage unit 11 are inconsistent, the abnormality detection unit 12 detects that the storage unit 25 of the battery box 20 is in an abnormal state.

[0073] In step S125, the abnormality detection unit 12 determines whether the storage unit 25 of the battery box 20 is detected to be in an abnormal state. If the abnormality detection unit 12 detects that the storage unit 25 of the battery box 20 is in an abnormal state, in step S126, the abnormality detection unit 12 outputs a storage unit abnormality signal indicating that the storage unit 25 of the battery box 20 is in an abnormal state, stores the abnormal state of the storage unit 25 of the battery box 20 in the storage unit 11, and ends the process. On the other hand, if the storage unit 25 of the battery box 20 is not detected to be in an abnormal state, the process ends.

[0074] (Summarize)

[0075] In the vehicle management system of this embodiment, since the voltage value and the current value can be obtained by using one integrated circuit, the acquisition of the voltage value and the current value can be synchronized. In addition, since the time lag between the acquisition timing of the voltage value and the acquisition timing of the current value can be suppressed, the state of the battery of each battery can be determined with high accuracy.

[0076] Furthermore, the information related to the storage battery stored in the storage unit of the storage battery box can be acquired by using one integrated circuit.

[0077] Furthermore, it is possible to obtain the voltage value and current value of the battery and the information on the battery stored in the storage unit while reducing the number of communication lines connected to the battery monitoring integrated circuit.

[0078] Furthermore, since the connection between the storage unit of the battery box and the battery control device is used to identify the type of the battery, it is not necessary to always connect the storage unit of the battery box to the battery control device. Therefore, in this embodiment, the storage unit of the battery box and the current sensor are connected to the battery monitoring integrated circuit via a multiplexer, so that the limited number of terminals of the battery monitoring integrated circuit can be used efficiently.

[0079] Furthermore, the abnormal state of the multiplexer is detected without increasing the number of ports of the multiplexer.

[0080] Furthermore, a multiplexer is used in the battery box to switch the current value and the information of the storage unit. Furthermore, by distinguishing the timing of obtaining the current value and the information of the storage unit, abnormality detection can be performed with a small number of terminals.

[0081] In addition, a storage unit for storing information related to the battery is provided in the battery box, and data is read and written to the storage unit of the battery box by the battery control device. In this case, the number of communication lines between the battery box and the battery control device can be reduced by using the communication path when the current value is obtained to read and write data to the storage unit of the battery box.

[0082] Furthermore, even if the communication speed when reading information from the storage unit of the battery box is different from the communication speed when acquiring the current value from the current sensor, it is possible to cope with the problem.

[0083] [Notes]

[0084] Furthermore, the multiplexer 26 may be configured to be able to switch the object that can communicate with the battery monitoring integrated circuit 28 to either the temperature sensor 27 or the storage unit 25 .

[0085] In the above-mentioned embodiment, the processing executed by the CPU reading the software (program) can also be executed by various processors other than the CPU. As the processor in this case, FPGA (Field-Programmable Gate Array) and other PLD (Programmable Logic Device) whose circuit structure can be changed after manufacturing, and ASIC (Application Specific Integrated Circuit) and other dedicated circuits as processors with circuit structures specially designed for executing specific processing can be exemplified. In addition, each processing can be executed by one of these various processors, or by a combination of two or more processors of the same type or different types (for example, a plurality of FPGAs, and a combination of a CPU and an FPGA, etc.). In addition, the hardware structure of these various processors is more specifically a circuit composed of a combination of circuit elements such as semiconductor elements.

[0086] In addition, in the above-mentioned embodiment, the program is pre-stored (installed) in a non-temporary recording medium that can be read by a computer. For example, in the ECU, the program is pre-stored in the ROM. However, it is not limited to this, and each program can also be stored in a storage device such as an HDD (Hard Disk Drive) and an SSD. In addition, each program can also be provided in a non-temporary recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), and a USB (Universal Serial Bus) memory. In addition, each program can also be provided in a manner of being downloaded from an external device via a network.

[0087] The process flow described in the above embodiment is also an example, and unnecessary steps may be deleted, new steps may be added, or the process order may be replaced within the scope of the gist.

Claims

1. A vehicle management system, wherein: Including management devices and external control devices, The management device is mounted on the vehicle and is disposed in a housing for storing the battery, and manages the battery. The management device comprises: A voltage sensor, which detects the voltage value of the battery; A current sensor, which detects the current value of the battery; an integrated circuit that is communicably connected to the voltage sensor and the current sensor and outputs a signal indicating a voltage value obtained from the voltage sensor and a signal indicating a current value obtained from the current sensor to the external control device; a storage unit connected to the integrated circuit in a communicable manner and storing information related to the battery; a multiplexer connected to the current sensor, the storage unit, and the integrated circuit, and capable of switching a target that can communicate with the integrated circuit to either the current sensor or the storage unit, The storage unit is connected to the external control device in a communicable manner via the integrated circuit. The multiplexer switches the object that can communicate with the integrated circuit to the current sensor when the ignition switch of the vehicle is turned on, and switches the object that can communicate with the integrated circuit to the storage unit when the ignition switch of the vehicle is turned off. The external control device detects whether the state of the multiplexer and the battery is abnormal based on the signal output via the multiplexer and the integrated circuit when the ignition switch of the vehicle is turned on, Furthermore, based on the signal outputted via the multiplexer and the integrated circuit when the ignition switch of the vehicle is turned off, it is detected whether the state of the storage unit is an abnormal state, Furthermore, the external control device switches the communication speed with the management device according to whether information is read from the storage unit via the integrated circuit and the multiplexer or the current value is obtained from the current sensor via the integrated circuit and the multiplexer.

2. The vehicle management system according to claim 1, wherein: The battery has a plurality of cells. The external control device sequentially performs the following processing and determines the state of the storage battery of each single cell. The processing is: acquiring respective voltage values ​​of a portion of the single cells from the voltage sensor; Obtaining a current value from the current sensor; and The voltage value of the remaining battery cell is acquired from the voltage sensor.

3. A vehicle management method, which is the vehicle management method in the vehicle management system according to claim 1, wherein: The external control device detects whether the state of the multiplexer and the battery is abnormal based on the signal outputted via the multiplexer and the integrated circuit when the ignition switch of the vehicle is turned on, Furthermore, the external control device detects whether the state of the storage unit is an abnormal state based on a signal outputted via the multiplexer and the integrated circuit when the ignition switch of the vehicle is turned off, Furthermore, the external control device switches the communication speed with the management device according to whether information is read from the storage unit via the integrated circuit and the multiplexer or the current value is obtained from the current sensor via the integrated circuit and the multiplexer.

4. The vehicle management method according to claim 3, wherein: The battery has a plurality of cells. The external control device sequentially performs the following processing and determines the state of the storage battery of each single cell. The processing is: acquiring respective voltage values ​​of a portion of the single cells from the voltage sensor; Obtaining a current value from the current sensor; and The voltage value of the remaining battery cell is acquired from the voltage sensor.

5. A computer-readable recording medium having a program recorded thereon, wherein: The program is for causing a computer to function as the external control device in the vehicle management system according to claim 1 or claim 2.

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