Anomaly detection system

Abstract

To provide an anomaly detection system capable of easily detecting poor connection of an energy storage module to a vehicle.SOLUTION: An anomaly detection system 1 includes a vehicle 100 and an anomaly detection unit 200. A vehicle body 410 includes a current sensor 19 (first sensor). Each of multiple battery packs 420 (energy storage modules) includes a current sensor 24 (second sensor). An anomaly detection unit 500 performs abnormality determination based on the difference between the sum of the detected values of each current sensor 24 of the multiple battery pack 420 and the detected value of the current sensor 19, and abnormality determination based on the deviation between the detected values of each current sensor 24 of the multiple battery pack 420.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to anomaly detection systems. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2022-114896 (Patent Document 1) discloses a vehicle equipped with a plurality of replaceable battery modules. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-114896 Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle described in Patent Document 1, it is conceivable that the resistance value of the battery module as seen from the load may increase due to poor connection between the battery module and the vehicle body. In this case, the increase in resistance value causes a change in the detection value of a sensor (such as a current sensor) installed in the vehicle. In this case, it is difficult to determine whether the change in the detection value is due to poor connection or an abnormality in the sensor itself.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an abnormality detection system that can easily detect a poor connection of an energy storage module to a vehicle. [Means for solving the problem]

[0006] An abnormality detection system according to a first aspect of the present disclosure includes a vehicle including a vehicle body and a plurality of power storage modules that are replaceably attached to the vehicle body and electrically connected in parallel to one another. The abnormality detection system includes an abnormality detection device that detects an electrical abnormality in the vehicle. The vehicle body includes a first sensor that detects a current value input / output between the vehicle body and the plurality of power storage modules, and each of the plurality of power storage modules includes a second sensor that detects a current value input / output between the vehicle body and the plurality of power storage modules. The abnormality detection device makes a first abnormality determination based on the difference between the sum of detection values ​​of the second sensors of each of the plurality of power storage modules and the detection value of the first sensor. The abnormality detection device makes a second abnormality determination based on the deviation between the detection values ​​of the second sensors of each of the plurality of power storage modules.

[0007] An abnormality detection system according to a second aspect of the present disclosure includes a vehicle including a vehicle body and a plurality of power storage modules replaceably attached to the vehicle body and electrically connected in series. The abnormality detection system includes an abnormality detection device that detects an electrical abnormality in the vehicle. The vehicle body includes a first circuit and a first sensor that detects a voltage value of the first circuit, and each of the plurality of power storage modules includes a second sensor that detects a voltage value. The plurality of power storage modules are electrically connected in parallel with the first circuit. Each of the plurality of power storage modules includes a second circuit and a second sensor that detects a voltage value of the second circuit. The abnormality detection device makes a first abnormality determination based on a difference between a sum of detection values ​​of the second sensors of each of the plurality of power storage modules and a detection value of the first sensor. The abnormality detection device makes a second abnormality determination based on a deviation between detection values ​​of the second sensors of each of the plurality of power storage modules.

[0008] In the abnormality detection systems according to the first and second aspects of the present disclosure, the first abnormality determination and the second abnormality determination are performed as described above. This makes it possible to easily distinguish between a state in which there is an abnormality in the first sensor, a state in which there is an abnormality in the second sensor, a state in which there is a poor connection of the power storage module, and a normal state in which there is no abnormality. As a result, it is possible to easily detect a poor connection of the power storage module to the vehicle.

[0009] The abnormality detection device may determine that there is an abnormality in either the first sensor or the second sensor when the difference in the first abnormality determination is greater than a first threshold, and may determine that there is a connection failure between one of the plurality of power storage modules and the vehicle body when the deviation in the second abnormality determination is greater than a second threshold after the first abnormality determination detects that the difference is equal to or less than the first threshold. With this configuration, it is possible to easily determine whether there is an abnormality in either the first sensor or the second sensor by the first abnormality determination. Furthermore, by performing the second abnormality determination after it is determined by the first abnormality determination that there is no abnormality in either the first sensor or the second sensor, it is possible to easily determine whether there is a connection failure in the power storage module.

[0010] After the first abnormality determination detects that the difference is greater than a first threshold, the abnormality detection device may determine that an abnormality exists in the second sensor of any of the multiple power storage modules if the deviation in the second abnormality determination is greater than a third threshold, and may determine that an abnormality exists in the first sensor if the deviation is equal to or less than the second threshold. With this configuration, by performing the second abnormality determination after determining that an abnormality exists in either the first sensor or the second sensor by the first abnormality determination, it is possible to easily determine whether the abnormality exists in the first sensor or the second sensor.

[0011] When the first abnormality determination and the second abnormality determination determine that there is an abnormality in the second sensor, the abnormality detection device executes a notification process to prompt the user of the vehicle to replace the plurality of power storage modules again. With this configuration, the user can be made aware that replacement of the power storage modules is necessary. [Effects of the Invention]

[0012] According to the present disclosure, a connection failure of an electricity storage module to a vehicle (vehicle body) can be easily detected. [Brief explanation of the drawings]

[0013] [Figure 1]1 is a diagram showing a configuration of a battery exchange system according to a first embodiment. [Figure 2] 1 is a diagram showing the configuration of a vehicle according to a first embodiment. [Figure 3] FIG. 1 is a first diagram showing a sequence of a battery exchange system according to a first embodiment. [Figure 4] FIG. 2 is a second diagram showing the sequence of the battery exchange system according to the first embodiment. [Figure 5] FIG. 10 is a diagram showing the configuration of a battery exchange system according to a second embodiment. [Figure 6] FIG. 10 is a first diagram showing a sequence of a battery exchange system according to a second embodiment. [Figure 7] FIG. 2 is a second diagram showing the sequence of the battery exchange system according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0015] [First embodiment] <System configuration> 1 is a diagram showing an abnormality detection system 1 and a battery exchange system 2 according to the first embodiment. The abnormality detection system 1 includes a vehicle 100 and an abnormality detection device 200. The battery exchange system 2 is the abnormality detection system 1 to which a battery exchange device 300 has been added.

[0016] The vehicle 100 includes a vehicle body 10 and a plurality of (two in the first embodiment) battery packs 20. The two battery packs 20 are replaceably attached to the vehicle body 10. The battery packs 20 of the vehicle 100 are replaced in a battery exchange device 300. As a result, the battery packs 20 provided in the battery exchange device 300 are attached to the vehicle 100. The vehicle body 10 is the part of the vehicle 100 other than the battery packs 20.

[0017] Battery pack 20 stores electric power used to drive (e.g., propel) vehicle 100. Two battery packs 20 are arranged, for example, side by side in the front-to-rear direction of vehicle 100. Battery pack 20 is an example of a "power storage module" in the present disclosure.

[0018] Vehicle 100 is, for example, a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), or a fuel cell electric vehicle (FCEV).

[0019] The abnormality detection device 200 is a device that detects electrical abnormalities in the vehicle 100. The abnormality detection device includes a processor 110, a memory 120, and a communication unit 130. The processor 110 controls the communication unit 130. The memory 120 stores programs executed by the processor 110 as well as information used in the programs (for example, maps, mathematical formulas, and various parameters). The abnormality detection device 200 may be provided within the battery exchange device 300. Details of the processing of the abnormality detection device 200 will be described later.

[0020] The battery exchange device 300 includes a battery exchange device main body 300a where battery exchange is performed, and a storage bay 300b where the battery packs 20 are stored. The battery exchange device main body 300a is a device that performs battery exchange by replacing the battery pack 20 installed in the vehicle 100 with a battery pack 20 provided in the storage bay 300b. The storage bay 300b is provided adjacent to the battery exchange device main body 300a. The battery exchange device 300 (battery exchange device main body 300a) is provided with an entrance / exit 301 through which the vehicle 100 enters and exits.

[0021] The battery replacement device 300 is provided with a vehicle stopping area 302. The battery replacement device 300 performs battery replacement while the vehicle 100 is parked in the vehicle stopping area 302. For example, in response to a user performing an operation on a car navigation device (not shown) of the vehicle 100 to instruct (request) the start of battery replacement work, an instruction signal to start the battery replacement work is transmitted from the vehicle 100 to the battery replacement device 300. In response to receiving the instruction signal, the battery replacement device 300 starts controlling the battery replacement work.

[0022] FIG. 2 is a diagram showing the configuration of a vehicle 100 according to the first embodiment. The vehicle body 10 includes a circuit CR11 and a circuit CR12. The battery pack 20 includes a circuit CR21 and a circuit CR22. The circuit CR21 corresponds to a first high-voltage circuit configured to apply a voltage (high voltage) from the battery cell 21 to the circuit CR11. The circuit CR11 corresponds to a second high-voltage circuit that receives a voltage (high voltage) from the battery cell 21. The circuit CR12 corresponds to a first low-voltage circuit configured to apply a voltage (low voltage) from the auxiliary battery 17 to the circuit CR22. The circuit CR22 corresponds to a second low-voltage circuit that receives a voltage (low voltage) from the auxiliary battery 17. A DC / DC converter 16 is provided between the circuit CR11 and the circuit CR12.

[0023] The two battery packs 20 (circuits CR21) are electrically connected in parallel with each other, and each of the two battery packs 20 (circuits CR21) is electrically connected in series with the vehicle body 10 (circuit CR11).

[0024] A circuit CR11 in a vehicle body 10 includes an MG (Motor Generator) 11a, an inverter 11b, a leakage detector 12, a DC charging relay 14a, a DC inlet 14b, an AC charger 15a, and an AC inlet 15b.

[0025] The circuit CR21 in the battery pack 20 is provided with a BMS (Battery Management System) 22a and a leakage detector 22b.

[0026] The vehicle body 10 further includes two terminals T11 to which the battery pack 20 can be attached and detached, and an SMR (System Main Relay) 13 disposed between each terminal T11 and a circuit CR11. The circuit CR11 (high voltage power supply line) is connected to each terminal T11 via the SMR 13.

[0027] The battery pack 20 further includes a terminal T21 to which the vehicle body 10 is detachable, and an SMR23 arranged between the terminal T21 and a circuit CR21. The circuit CR21 (high voltage power supply line) is connected to the terminal T21 via the SMR23.

[0028] The battery cell 21 is composed of a secondary battery such as a lithium ion battery, a nickel-metal hydride battery, or a sodium ion battery. The secondary battery may be a liquid secondary battery or an all-solid-state secondary battery. A plurality of secondary batteries may form a battery pack.

[0029] The vehicle body 10 further includes two terminals T12. A circuit CR12 (low-voltage power supply line) in the vehicle body 10 is connected to each terminal T12. A communication line CL1 in the vehicle body 10 is also connected to each terminal T12. The battery pack 20 further includes a terminal T22. A circuit CR22 (low-voltage power supply line) in the battery pack 20 is connected to the terminal T22. A communication line CL2 in the battery pack 20 is also connected to the terminal T22.

[0030] The auxiliary battery 17 outputs DC power to the circuit CR12 (low-voltage power supply line). The circuit CR12 further includes ECUs (Electronic Control Units) 18a, 18b, 18c, and 18d in addition to the auxiliary battery 17. The circuit CR22 further includes ECUs 28a and 28b. The auxiliary battery 17 supplies power to each of the ECUs 18a to 18d and 28a and 28b connected to the low-voltage power supply line, for example.

[0031] The ECU 18a corresponds to a control device (EV-ECU) that controls various controls related to the vehicle 100. The ECU 18a receives information from each of the plurality of battery packs 20 through communication via the communication line CL1. Specifically, the ECU 18a receives information from each of the ECU 28a and the ECU 28b.

[0032] ECU 18b corresponds to a control device (Plg-ECU) that detects the states of DC inlet 14b and AC inlet 15b. ECU 18c corresponds to a control device (Bat-C-ECU) that controls DC charging relay 14a and AC charger 15a. ECU 18d corresponds to a control device that monitors the leakage state of circuit CR11.

[0033] The ECU 28a corresponds to a control device (Bat-ECU) that monitors the state of the battery cells 21 and controls the SMR 23. The ECU 28b corresponds to a control device that monitors the leakage state of the circuit CR 21. The ECUs are connected to each other via an in-vehicle network (e.g., a CAN (Controller Area Network)) so that they can communicate with each other.

[0034] The leakage detector 12 detects a leakage state related to the circuit CR11 and outputs the detected leakage state to the ECU 18d. The BMS 22a detects the state (current, voltage, temperature, etc.) of the battery cell 21 and outputs the detection result to the ECU 28a. The leakage detector 22b detects a leakage state related to the circuit CR21 and outputs the detected leakage state to the ECU 28b.

[0035] Each of the SMR13 and the SMR23 switches between connection and disconnection of the electrical path between the circuit CR11 and the circuit CR21. When the voltage of the battery cell 21 is applied to the circuit CR11, the ECU 18a sets both the SMR13 and the SMR23 in a closed state (connected state). When the voltage of the battery cell 21 is not applied to the circuit CR11, the ECU 18a sets at least one of the SMR13 and the SMR23 in an open state (disconnected state). When the vehicle 100 is being driven (during driving, charging, etc.), the SMR13 and the two SMRs 23 are in a closed state.

[0036] Terminals T21 and T22 of battery pack 20 are detachably attached to terminals T11 and T12, respectively, of vehicle body 10. Battery pack 20 is attached to vehicle body 10 by connecting terminals T21 and T22 to terminals T11 and T12, respectively.

[0037] The vehicle body 10 includes a current sensor 19. The current sensor 19 detects the value of a current input / output between the vehicle body 10 and the plurality of battery packs 20. The current sensor 19 is provided between the connection point between the circuit CR11 and the circuit CR12 and the SMR 13. The current sensor 19 is an example of a "first sensor" in the present disclosure.

[0038] Each battery pack 20 includes a current sensor 24. The current sensor 24 is provided between the SMR 23 and the battery cell 21. Each current sensor 24 detects the value of a current input / output to / from the vehicle body 10. The current sensor 24 is an example of a "second sensor" in the present disclosure.

[0039] In conventional vehicles, a poor connection between the battery pack and the vehicle body can cause an increase in resistance, which in turn causes a change in the detection value of a current sensor installed in the vehicle body or the battery pack. However, it is difficult to determine whether the change in detection value is due to the poor connection or an abnormality in the current sensor itself.

[0040] Therefore, in the first embodiment, the abnormality detection device 200 performs a first abnormality determination based on the difference between the sum of the detection values ​​of the current sensors 24 of the multiple battery packs 20 and the detection value of the current sensor 19 of the vehicle body 10, and a second abnormality determination based on the deviation between the detection values ​​of the current sensors 24 of the multiple battery packs 20. By performing the first abnormality determination and the second abnormality determination, it is possible to distinguish between an abnormality in the current sensor 19, an abnormality in the current sensor 24, a poor connection between the vehicle body 10 and the battery pack 20, and a normal state.

[0041] <System sequence> 3 and 4 respectively show sequence control of the abnormality detection system 1 and the battery exchange system 2. Note that the processing by the abnormality detection device 200 is executed by the processor 110 (FIG. 1). Also, the sequences of FIGS. 3 and 4 are performed in the battery exchange device 300 before the vehicle 100 starts traveling.

[0042] 3, in step S1, vehicle 100 determines whether or not replacement of battery pack 20 has been completed. Vehicle 100 may determine that replacement of battery pack 20 has been completed based on, for example, information from battery replacement device 300, or may determine based on, for example, the connection state between battery pack 20 and vehicle body 10.

[0043] In step S2, vehicle 100 turns on the ignition power and transmits information indicating that the ignition power has been turned on to abnormality detection device 200. In step S3, vehicle 100 turns on each of SMRs 13 and 23 (FIG. 2) and transmits information indicating that each of SMRs 13 and 23 has been turned on to abnormality detection device 200. This electrically connects circuit CR11 and circuit CR21 (FIG. 2).

[0044] In step S4, the abnormality detection device 200 determines whether the ignition power supply is turned on. If it is determined that the ignition power supply is turned on (Yes in S4), the process proceeds to step S5. If it is determined that the ignition power supply is not turned on (No in S4), the process of step S4 is repeated.

[0045] In step S5, abnormality detection device 200 determines whether each of SMRs 13 and 23 is turned on. If it is determined that each of SMRs 13 and 23 is turned on (Yes in S5), the process proceeds to step S6. If it is determined that each of SMRs 13 and 23 is not turned on (No in S5), the process of step S5 is repeated.

[0046] In step S6, the abnormality detection device 200 determines whether the difference between the sum of the detection values ​​of the current sensors 24 of each battery pack 20 and the detection value of the current sensor 19 of the vehicle body 10 is greater than threshold A. Note that the difference refers to the absolute value of the difference between the sum and the detection value of the current sensor 19. If the difference is greater than threshold A (Yes in S6), the process proceeds to step S7. If the difference is equal to or less than threshold A (No in S6), the process proceeds to step S10. Note that threshold A is an example of a "first threshold" in the present disclosure. Also, the determination process of step S6 is an example of a "first abnormality determination" in the present disclosure.

[0047] After each of the SMRs 13 and 23 is turned on, the abnormality detection device 200 may pass an inspection current to the vehicle 100 to make the determinations in step S6 and subsequent steps.

[0048] In step S7, the abnormality detection device 200 determines whether the deviation of the detection values ​​of the current sensors 24 of each battery pack 20 is greater than threshold B. Note that the deviation refers to the absolute value of the difference between the detection values ​​of the two current sensors 24. If the deviation is greater than threshold B (Yes in S7), the process proceeds to step S8. If the difference is equal to or less than threshold B (No in S7), the process proceeds to step S9. Note that threshold B is an example of a "third threshold" in the present disclosure. Also, the determination process in step S7 is an example of a "second abnormality determination" in the present disclosure.

[0049] In step S8, the abnormality detection device 200 determines that the current sensor 24 of one of the two battery packs 20 is abnormal, and then the process ends.

[0050] In step S9, the abnormality detection device 200 determines that the current sensor 19 of the vehicle body 10 is abnormal. Then, the process ends.

[0051] In step S10, the abnormality detection device 200 determines whether the deviation of the detection values ​​of the current sensors 24 of each battery pack 20 is greater than threshold C. Note that the deviation refers to the absolute value of the difference between the detection values ​​of the two current sensors 24. If the deviation is greater than threshold C (Yes in S10), the process proceeds to step S11. If the difference is equal to or less than threshold C (No in S10), the process proceeds to step S12. Note that threshold C is an example of a "second threshold" in the present disclosure. Also, the determination process of step S10 is an example of a "second abnormality determination" in the present disclosure. Note that threshold C may be smaller than threshold B.

[0052] In step S11, the abnormality detection device 200 determines that there is a poor connection between one of the two battery packs 20 and the vehicle body 10. Then, the process ends.

[0053] In step S12, abnormality detection device 200 determines that the state is normal. Specifically, abnormality detection device 200 determines that there is no abnormality in current sensor 19, no abnormality in current sensor 24, and no connection failure. Then, the process ends.

[0054] FIG. 4 is a sequence diagram showing control after an abnormality (or normality) is determined in the sequence control of FIG.

[0055] In step S21, the abnormality detection device 200 determines whether or not there is a poor connection between the battery pack 20 and the vehicle body 10. That is, the abnormality detection device 200 determines whether or not the processing of step S11 (FIG. 3) has been executed. If it is determined that there is a poor connection (Yes in S21), the processing proceeds to step S23. If it is determined that there is no poor connection (No in S21), the processing proceeds to step S22.

[0056] In step S22, the abnormality detection device 200 determines whether or not there is an abnormality in the current sensor 24 of either of the two battery packs 20. That is, the abnormality detection device 200 determines whether or not the processing of step S8 (FIG. 3) has been executed. If it is determined that there is an abnormality in the current sensor 24 (Yes in S22), the processing proceeds to step S23. If it is determined that there is no abnormality in the current sensor 24 (No in S22), the processing proceeds to step S24.

[0057] In step S23, the abnormality detection device 200 performs a notification process to each of the vehicle 100 and the battery exchange device 300 via the communication unit 130 (FIG. 1) to prompt them to replace the battery pack 20 again. Specifically, the abnormality detection device 200 transmits information indicating that the battery pack 20 needs to be replaced again to each of the vehicle 100 and the battery exchange device 300 via the communication unit 130 (FIG. 1). Thereafter, the process ends. Note that the notification may be sent to only either the battery exchange device 300 or the vehicle 100.

[0058] Furthermore, if a poor connection is determined in step S21 and the battery pack 20 is replaced again, and then a poor connection is determined again in step S21, the abnormality detection device 200 may determine that there is an abnormality on the vehicle 100 side (terminal T11, etc.), and may execute a notification process to urge the user to take the vehicle to a dealer or repair shop.

[0059] In step S24, the abnormality detection device 200 determines whether or not there is an abnormality in the current sensor 19 of the vehicle body 10. That is, the abnormality detection device 200 determines whether or not the processing of step S9 (FIG. 3) has been executed. If it is determined that there is an abnormality in the current sensor 19 (Yes in S24), the processing proceeds to step S25. If it is determined that there is no abnormality in the current sensor 19 (No in S24), the processing ends.

[0060] In step S25, the abnormality detection device 200 executes a notification process to prompt the user to bring the vehicle to a dealer or repair shop. Specifically, the abnormality detection device 200 transmits information to the vehicle 100 via the communication unit 130 (FIG. 1) indicating that the vehicle needs to be brought to the facility. Then, the process ends.

[0061] The order in which the determination processes of steps S21, S22, and S24 are performed is not limited to the example shown in FIG.

[0062] In step S31, the vehicle 100 determines whether or not it has received a notification (notification by the notification process of S23) prompting it to replace the battery pack 20 again. If it has received a notification prompting it to replace the battery pack again (Yes in S31), the process proceeds to step S32. If it has not received a notification prompting it to replace the battery pack again (No in S31), the process proceeds to step S33.

[0063] In step S32, the vehicle 100 displays a notice urging the user to replace the battery pack 20 again on a display terminal such as a car navigation device.

[0064] In step S33, vehicle 100 determines whether or not it has received a notification (notification by the notification process in S25) urging it to enter a dealer or a repair shop.

[0065] In step S34, vehicle 100 displays a notice prompting entry on a display terminal such as a car navigation device.

[0066] In step S41, the battery exchange device 300 determines whether or not a notification prompting re-exchange of the battery pack 20 (notification by the notification process of S23) has been received. If a notification prompting re-exchange has been received (Yes in S41), the process proceeds to step S42. If a notification prompting re-exchange has not been received (No in S41), the process ends.

[0067] In step S42, the battery exchange device 300 determines whether or not there is an instruction (request) from the user of the vehicle 100 to replace the battery pack 20 again. If there is such an instruction (request) (Yes in S42), the process proceeds to step S43. If there is no such instruction (request) (No in S42), the process ends.

[0068] In step S43, the battery exchange device 300 executes re-exchange of the battery pack 20. After re-exchange of the battery pack 20 is completed, the process returns to step S1 (FIG. 3).

[0069] As described above, in the first embodiment, the abnormality detection device 200 performs an abnormality determination based on the difference between the sum of the detection values ​​of the current sensors 19 of the multiple battery packs 20 and the detection value of the current sensor 19 of the vehicle body 10, and an abnormality determination based on the deviation between the detection values ​​of the current sensors 19 of the multiple battery packs 20. This makes it possible to easily distinguish between a poor connection between the battery pack 20 and the vehicle body 10 and an abnormality in the current sensor 19 or the current sensor 24. As a result, it is possible to provide an appropriate notification to the user of the vehicle 100 after an abnormality determination is made.

[0070] In the first embodiment, the abnormality detection device 200 performs the abnormality determination based on the difference before performing the abnormality determination based on the deviation, thereby making it possible to check the reliability of the current sensors 19 and 24 before determining whether or not there is a connection failure.

[0071] [Second embodiment] A second embodiment of the present disclosure will be described with reference to Figures 5 to 7. In the second embodiment, battery packs 420 are electrically connected in series. The same components as those in the first embodiment are given the same reference numerals and will not be described again. Components with the same names as those in the first embodiment may be considered to be configured in the same way as those in the first embodiment, and their description may be omitted or simplified.

[0072] <System configuration> 5 is a diagram showing an abnormality detection system 3 and a battery exchange system 4 according to the second embodiment. The abnormality detection system 3 includes a vehicle 400 and an abnormality detection device 500. The battery exchange system 4 is the abnormality detection system 3 to which a battery exchange device 300 has been added.

[0073] The vehicle 400 includes a vehicle body 410 and a plurality of (two in the second embodiment) battery packs 420. The abnormality detection device 500 includes a processor 510, a memory 520, and a communication unit 530. The battery packs 420 are an example of the "power storage module" of the present disclosure.

[0074] The vehicle body 410 includes a circuit CR411. The circuit CR411 is a circuit corresponding to the circuit CR11 of the first embodiment. The vehicle body 410 (circuit CR411) includes a voltage sensor 412. The voltage sensor 412 acquires the voltage value of the circuit CR11. The circuit CR411 and the voltage sensor 412 are examples of the "first circuit" and the "first sensor" of the present disclosure, respectively.

[0075] Each battery pack 420 includes a circuit CR421. The circuit CR421 is a circuit corresponding to the circuit CR21 of the first embodiment. The battery pack 420 (circuit CR421) includes a voltage sensor 422. In each battery pack 420, the voltage sensor 422 acquires the voltage value of the circuit CR421. The circuit CR421 and the voltage sensor 422 are examples of the "second circuit" and "second sensor" of the present disclosure, respectively.

[0076] The two battery packs 420 (circuits CR421) are electrically connected in series, and the two battery packs 420 (circuits CR421) are electrically connected in parallel with the vehicle body 410 (circuit CR411).

[0077] <System sequence> Next, the sequence control of the battery exchange system 4 (abnormality detection system 3) will be described with reference to FIGS.

[0078] In step S56 after step S5, the abnormality detection device 500 determines whether the difference between the sum of the detection values ​​of the voltage sensors 422 of the battery packs 420 and the detection value of the voltage sensor 412 of the vehicle body 410 is greater than a threshold value D. Note that the difference refers to the absolute value of the difference between the sum of the detection values ​​and the voltage sensor 412. If the difference is greater than the threshold value D (Yes in S56), the process proceeds to step S57. If the difference is equal to or less than the threshold value D (No in S56), the process proceeds to step S60. Note that the threshold value D is an example of a "first threshold value" in the present disclosure. The determination process in step S56 is an example of a "first abnormality determination" in the present disclosure.

[0079] After each of SMRs 13 and 23 is turned on, abnormality detection device 500 may pass an inspection current to vehicle 400 to make the determinations in step S56 and subsequent steps.

[0080] In step S57, the abnormality detection device 500 determines whether the deviation between the detection values ​​of the voltage sensors 422 of each battery pack 420 is greater than a threshold value E. Note that the deviation refers to the absolute value of the difference between the detection values ​​of the two voltage sensors 422. If the deviation is greater than the threshold value E (Yes in S57), the process proceeds to step S58. If the difference is equal to or less than the threshold value E (No in S57), the process proceeds to step S59. Note that the threshold value E is an example of a "third threshold value" in the present disclosure. The determination process in step S57 is an example of a "second abnormality determination" in the present disclosure.

[0081] In step S58, the abnormality detection device 500 determines that the voltage sensor 422 of one of the two battery packs 420 is abnormal, and then the process ends.

[0082] In step S59, the abnormality detection device 500 determines that the voltage sensor 412 of the vehicle body 410 is abnormal, and then the process ends.

[0083] In step S60, the abnormality detection device 500 determines whether the deviation between the detection values ​​of the voltage sensors 422 of each battery pack 420 is greater than a threshold value F. The deviation refers to the absolute value of the difference between the detection values ​​of the two voltage sensors 422. If the deviation is greater than the threshold value F (Yes in S60), the process proceeds to step S61. If the difference is equal to or less than the threshold value F (No in S60), the process proceeds to step S62. The threshold value F is an example of a "second threshold value" in the present disclosure. The determination process in step S60 is an example of a "second abnormality determination" in the present disclosure. The threshold value F may be smaller than the threshold value E.

[0084] In step S61, abnormality detection device 500 determines that there is a poor connection between one of two battery packs 420 and vehicle body 410. Then, the process ends.

[0085] In step S62, abnormality detection device 500 determines that no electrical abnormality has been detected in vehicle 400 and that the vehicle is in a normal state, after which the process ends.

[0086] Fig. 7 is a sequence diagram showing a control similar to that of Fig. 4 of the first embodiment. In the second embodiment, step S72 is executed instead of step S22 (Fig. 4), and step S74 is executed instead of step S24 (Fig. 4).

[0087] In step S72, abnormality detection device 500 determines whether or not there is an abnormality in voltage sensor 422 of battery pack 420. If there is an abnormality in voltage sensor 422 (Yes in S72), the process proceeds to step S23. If there is no abnormality in voltage sensor 422 (No in S72), the process proceeds to step S74.

[0088] In step S74, abnormality detection device 500 determines whether or not there is an abnormality in voltage sensor 412 of vehicle body 410. If there is an abnormality in voltage sensor 412 (Yes in S74), the process proceeds to step S25. If there is no abnormality in voltage sensor 412 (No in S74), the process ends.

[0089] In the first and second embodiments, an example is shown in which an abnormality determination is made based on the difference between the sum of the detection values ​​of the sensors (24, 422) of the battery packs and the detection value of the vehicle body sensor (19, 412), and then an abnormality determination is made based on the deviation between the detection values ​​of the battery packs, but the present disclosure is not limited to this. The order of the abnormality determinations may be reversed.

[0090] In the first and second embodiments, an example is shown in which the abnormality determination is performed while the electric vehicle is placed in the battery exchange device, but the present disclosure is not limited to this. For example, the abnormality determination may be performed while the vehicle is traveling. In this case, the abnormality detection device may be provided in the vehicle.

[0091] In the above first and second embodiments, examples have been shown in which the notification urging the user to replace the battery pack again and the notification urging the user to take the vehicle to a dealer or the like are displayed on a car navigation device or the like of the vehicle, but the present disclosure is not limited to this. For example, the notification may be displayed on a user's terminal (for example, a smartphone, a PC, or the like). Furthermore, instead of the notification urging the user to take the vehicle to a dealer or the like, a notification process may be executed to urge the user to refrain from driving the vehicle.

[0092] In the first and second embodiments, an example is shown in which a notification is given to urge a battery pack to be replaced when there is an abnormality in the current sensor of the battery pack or when there is a poor connection between the vehicle body and the battery pack, but the present disclosure is not limited to this. For example, a notification may be given only to the existence of an abnormality or a poor connection.

[0093] In the first embodiment, an example in which an SMR is provided in each of the battery pack 20 and the vehicle body 10 has been described, but the present disclosure is not limited to this. An SMR may be provided in only one of the battery pack 20 and the vehicle body 10. This modification may also be applied to the second embodiment.

[0094] The configurations (processing) of the above-described embodiment and the above-described modifications may be combined with each other.

[0095] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0096] 1,3 Abnormality detection system, 10,410 vehicle body, 19 current sensor (first sensor), 20,420 battery pack (energy storage module), 24 current sensor (second sensor), 100,400 vehicle, 200 abnormality detection device, 411 circuit CR (first circuit), 412 voltage sensor (first sensor), 421 circuit CR (second circuit), 422 voltage sensor (second sensor), 500 abnormality detection device.

Claims

1. a vehicle including a vehicle body and a plurality of power storage modules replaceably attached to the vehicle body and electrically connected in parallel to one another; an abnormality detection device that detects an electrical abnormality in the vehicle, the vehicle body includes a first sensor that detects a current value input / output between the vehicle body and the plurality of power storage modules; each of the plurality of power storage modules includes a second sensor that detects a current value input / output between the power storage modules and the vehicle body; The abnormality detection device a first abnormality determination based on a difference between a sum of the detection values ​​of the second sensors of each of the plurality of power storage modules and the detection value of the first sensor; a second abnormality determination based on a deviation between the detection values ​​of the second sensors of the plurality of power storage modules.

2. a vehicle including a vehicle body and a plurality of power storage modules replaceably attached to the vehicle body and electrically connected in series; an abnormality detection device that detects an electrical abnormality in the vehicle, The vehicle body is A first circuit; a first sensor that detects a voltage value of the first circuit; the plurality of power storage modules are electrically connected in parallel with the first circuit, Each of the plurality of power storage modules is A second circuit; a second sensor that detects a voltage value of the second circuit; The abnormality detection device a first abnormality determination based on a difference between a sum of the detection values ​​of the second sensors of each of the plurality of power storage modules and the detection value of the first sensor; a second abnormality determination based on a deviation between the detection values ​​of the second sensors of the plurality of power storage modules.

3. The abnormality detection device When the difference in the first abnormality determination is greater than a first threshold value, it is determined that an abnormality exists in either the first sensor or the second sensor; 3. The abnormality detection system according to claim 1, wherein, after the difference is detected to be equal to or less than the first threshold value in the first abnormality determination, if the deviation in the second abnormality determination is greater than a second threshold value, it is determined that there is a poor connection between any of the plurality of power storage modules and the vehicle body.

4. After it is detected in the first abnormality determination that the difference is greater than the first threshold value, the abnormality detection device: When the deviation in the second abnormality determination is greater than a third threshold value, it is determined that an abnormality exists in the second sensor of any of the plurality of power storage modules; The anomaly detection system according to claim 3 , wherein when the deviation is equal to or less than the second threshold value, it is determined that an abnormality exists in the first sensor.

5. 3. The abnormality detection system according to claim 1, wherein, when it is determined by the first abnormality determination and the second abnormality determination that there is an abnormality in the second sensor, the abnormality detection device executes a notification process to prompt a user of the vehicle to replace the plurality of power storage modules again.

Images