Battery level estimation device

Abstract

This increases the distance the device can travel after a failure in the voltage detection unit that detects the battery voltage. [Solution] A driving distance calculation system 1 comprises a cell voltage detection unit 2a connected to a battery pack 110, and a microcontroller 2d that, in the event of a failure of the cell voltage detection unit 2a, estimates the dischargeable amount of the battery pack 110 based on state data indicating the state of the battery pack 110 before the failure of the cell voltage detection unit 2a.

Description

Technical Field

[0001] The present invention relates to a battery remaining amount estimation device.

Background Art

[0002] For example, Patent Document 1 discloses a relative remaining capacity estimation device for a secondary battery that estimates the relative remaining capacity by current integration. The relative remaining capacity estimation device for the secondary battery disclosed in Patent Document 1 obtains an estimation of the relative remaining capacity of the secondary battery based on the electromotive force of the secondary battery, the temperature of the secondary battery, the current of the secondary battery, and the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, an electric vehicle includes a battery pack composed of a plurality of rechargeable battery modules. In such an electric vehicle, a voltage detection unit is provided for each battery module, and each voltage detection unit detects the cell voltage of a plurality of battery cells included in the battery module. Further, the charge rate and the like of each battery module are calculated based on the cell voltage detected by the voltage detection unit. By the way, when the voltage detection unit fails due to some cause, it is necessary to move the vehicle to a safe place. In such a case, for example, it is conceivable to estimate the movable amount by current integration as in Patent Document 1. However, since the state of the battery module cannot be grasped due to the failure of the voltage detection unit, the movable amount is calculated assuming that the charge rate of the battery module is low. For this reason, the movable distance from the occurrence of the failure of the voltage detection unit becomes short.

[0005] This invention has been made in view of the above-mentioned problems, and aims to increase the distance that can be traveled after a failure of the voltage detection unit that detects the voltage of a battery. [Means for solving the problem]

[0006] The present invention employs the following configuration as a means to solve the above problems.

[0007] A first aspect of the present invention is a battery remaining charge estimation device, comprising a voltage detection unit for detecting the voltage of a battery, and a capacity estimation unit that, in the event of a failure of the voltage detection unit, estimates the amount of dischargeable battery based on state data indicating the state of the battery before the failure of the voltage detection unit. [Effects of the Invention]

[0008] According to the present invention, the amount of dischargeable battery immediately after the voltage detection unit fails is estimated based on the battery state data before the voltage detection unit fails. Therefore, according to the present invention, unless the battery is in its lowest charge state, the amount of dischargeable battery can be calculated to be longer than when calculating the amount of dischargeable battery charge assuming the lowest charge state. Thus, the present invention makes it possible to increase the distance that can be discharged after the voltage detection unit that detects the battery voltage fails. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic block diagram showing the general configuration of a system for calculating the drivable distance in one embodiment of the present invention. [Figure 2] This is a flowchart illustrating the operation of the microcontroller in the drivable distance calculation system according to one embodiment of the present invention. [Figure 3] This is a flowchart illustrating the operation of the server device included in the drivable distance calculation system according to one embodiment of the present invention. [Modes for carrying out the invention]

[0010] Hereinafter, an embodiment of the battery charge estimation device according to the present invention will be described with reference to the drawings.

[0011] Figure 1 is a schematic block diagram showing the general configuration of the driving range calculation system 1 (battery charge estimation device) of this embodiment. The driving range calculation system 1 of this embodiment is a system for calculating the driving range of a vehicle 100 (mobile object) such as an electric vehicle. However, the driving range calculation system 1 is not limited to electric vehicles and can also be used as a system for calculating the driving range of a hybrid vehicle. Furthermore, the driving range calculation system 1 can also be used as a flight range calculation system for calculating the travel range of an aerial object such as a drone.

[0012] As shown in Figure 1, the mileage calculation system 1 of this embodiment comprises a battery management device 2 and a server device 3 (externally installed device). As shown in Figure 1, the battery management device 2 is mounted on the vehicle 100 together with the battery pack 110 (battery). The server device 3 is installed outside the vehicle 100 so as to be able to communicate with the battery management device 2. However, it is also possible to install the functions of the server device 3 on the vehicle 100.

[0013] As shown in Figure 1, the battery pack 110 supplies DC power to the load in the vehicle 100. In this embodiment, the battery pack 110 consists of two battery modules M connected in series. That is, there are two (or more) battery modules M provided for the vehicle 100. Each battery module M is connected in series to form the battery pack 110. The number of battery modules M in the battery pack 110 can be changed. Such a battery pack 110 is a rechargeable battery, such as a lithium-ion battery.

[0014] Each of the two battery modules M has a predetermined output voltage (module voltage). That is, the output voltage (battery voltage) of the battery pack 110 is the sum of the module voltages of the two battery modules M. Each battery module M comprises multiple battery cells connected in series. That is, each battery module M consists of multiple battery cells connected in series. That is, the module voltage of the battery module M is the sum of the output voltages (cell voltages) of the multiple battery cells.

[0015] The battery management device 2 manages the battery pack 110. As shown in Figure 1, the battery management device 2 includes a cell voltage detection unit 2a (voltage detection unit), a temperature sensor 2b, a current sensor 2c, a microcontroller 2d (capacity estimation unit), and a communication unit 2e.

[0016] A cell voltage detection unit 2a is provided for each battery module M. In other words, in this embodiment, there are two cell voltage detection units 2a, similar to the battery module M. Each cell voltage detection unit 2a is connected to the battery pack 110. One cell voltage detection unit 2a is connected to one battery module M. The other cell voltage detection unit 2a is connected to the other battery module M.

[0017] Each cell voltage detection unit 2a detects the voltage (cell voltage) of each battery cell contained in the connected battery module M and outputs the detection result (cell voltage value indicating the value of the cell voltage). Each cell voltage detection unit 2a is connected to the microcontroller 2d, as shown in Figure 1. The cell voltage value output from the cell voltage detection unit 2a is input to the microcontroller 2d.

[0018] The temperature sensor 2b measures the temperature of the battery pack 110. In this embodiment, as shown in Figure 1, a temperature sensor 2b is provided for each battery module M. In other words, in this embodiment, two temperature sensors 2b are provided, similar to the battery module M.

[0019] Each temperature sensor 2b measures and outputs the temperature of the battery module M. That is, one temperature sensor 2b measures and outputs the temperature of one battery module M, and the other temperature sensor 2b measures and outputs the temperature of the other battery module M. Each temperature sensor 2b is connected to the microcomputer 2d. The measurement results output from the temperature sensor 2b are input to the microcomputer 2d.

[0020] The current sensor 2c detects the current output from the battery pack 110 and outputs the detection result (current value indicating the value of the current). The current sensor 2c detects the current flowing through the wiring connected to the positive electrode of the battery pack 110. As shown in FIG. 1, the current sensor 2c is connected to the microcomputer 2d. The current value output from the current sensor 2c is input to the microcomputer 2d.

[0021] As described above, the microcomputer 2d is connected to the cell voltage detection unit 2a, the temperature sensor 2b, and the current sensor 2c. The microcomputer 2d receives the cell voltage values of each battery cell from the cell voltage detection unit 2a, the temperature of each battery module M from the temperature sensor 2b, and the current value of the battery pack 110 from the current sensor 2c. Such a microcomputer 2d is a microcomputer that performs arithmetic processing based on a program stored in advance.

[0022] In addition, the microcomputer 2d performs a failure determination of the cell voltage detection unit 2a. For example, when the input of the cell voltage value from the cell voltage detection unit 2a stops, the microcomputer 2d determines that the cell voltage detection unit 2a has failed.

[0023] When the microcomputer 2d does not determine that the cell voltage detection unit 2a has failed (that is, when the cell voltage detection unit 2a is normal), for example, the microcomputer 2d outputs the cell voltage value input from the cell voltage detection unit 2a to the server device 3 via the communication unit 2e. Also, when the cell voltage detection unit 2a is normal, the microcomputer 2d outputs the temperature of each battery module M input from the temperature sensor 2b and the current value of the battery pack 110 input from the current sensor 2c to the server device 3 via the communication unit 2e.

[0024] On the other hand, when the cell voltage detection unit 2a fails, the microcomputer 2d estimates the dischargeable amount of the battery pack 110 based on the state data indicating the state of the battery pack 110 before the failure of the cell voltage detection unit 2a. As will be described later, in the present embodiment, the state data of the battery pack 110 is created by the server device 3. When the cell voltage detection unit 2a fails, the microcomputer 2d outputs a failure occurrence signal to the server device 3 via the communication unit 2e. The microcomputer 2d estimates the dischargeable amount of the battery pack 110 based on the state data input from the server device 3.

[0025] Such state data includes, for example, the charge rate of the battery pack 110. Specifically, the charge rate of the battery pack 110 means the charge rate (SOC: State Of Charge) of each battery module M. Further, the state data includes, for example, the soundness of the battery pack 110. Specifically, the soundness of the battery pack 110 means the soundness (SOH: State of Health) of each battery module M.

[0026] For example, the microcomputer 2d discriminates the battery module M with the lowest charge rate based on the state data, and sets the discharge amount of the battery pack 110 until the charge rate of this battery module M with the lowest charge rate reaches the allowable lower limit value as the dischargeable amount.

[0027] In addition, the microcomputer 2d calculates the travelable distance of the vehicle 100 based on the dischargeable amount of the battery pack 110. For example, the microcomputer 2d causes the travelable distance calculated to be displayed on a display device or the like mounted on the vehicle 100.

[0028] Furthermore, the microcomputer 2d updates the dischargeable amount according to the travel amount of the vehicle 100 after the occurrence of the failure of the cell voltage detection unit 2a. Specifically, the microcomputer 2d calculates the discharge amount corresponding to the travel amount based on the integrated value of the current value input from the current sensor 2c, and updates the dischargeable amount by subtracting the calculated discharge amount from the dischargeable amount.

[0029] When the cell voltage detection unit 2a fails, the microcontroller 2d estimates the chargeable amount of the battery pack 110 based on the state data of the cell voltage detection unit 2a before it failed. The microcontroller 2d also estimates the chargeable amount of the battery pack 110 based on the state data input from the server device 3.

[0030] For example, the microcontroller 2d identifies the battery module M with the highest charge level based on the status data, and sets the amount of charge in the battery pack 110 until the charge level of this battery module M with the highest charge level reaches the allowable upper limit as the amount of charge that can be charged.

[0031] Furthermore, the microcontroller 2d updates the charge amount of the vehicle 100 after a failure of the cell voltage detection unit 2a. Specifically, the microcontroller 2d calculates the charge amount based on the integrated value of the current value input from the current sensor 2c, and updates the charge amount by subtracting the calculated charge amount from the charge amount.

[0032] The communication unit 2e is capable of wireless communication with the server device 3. The communication unit 2e is connected to the microcontroller 2d and, under the control of the microcontroller 2d, can transmit cell voltage values, temperature, and current values ​​input from the microcontroller 2d to the server device 3. In addition, the communication unit 2e receives status data from the server device 3 under the control of the microcontroller 2d and inputs the received status data to the microcontroller 2d.

[0033] As described above, the server device 3 is located outside the vehicle 100 and is installed, for example, in a data center. For example, the server device 3 may consist of multiple computer devices that are connected to each other in a way that allows them to communicate with one another.

[0034] In this embodiment, if the cell voltage detection unit 2a is functioning correctly, the server device 3 receives the cell voltage value, temperature, and current value from the microcontroller 2d. Based on the cell voltage value, temperature, and current value, the server device 3 creates state data for the battery pack 110. For example, the server device 3 creates state data that includes the charge level and health of the battery pack 110. Note that the charge level and health are temperature-dependent. Therefore, the server device 3 creates the state data in relation to the temperature.

[0035] Furthermore, when the server device 3 receives a fault signal from the microcontroller 2d via the communication unit 2e, it transmits status data to the microcontroller 2d. At this time, the server device 3 transmits at least the most recent status data to the microcontroller 2d. In other words, if the cell voltage detection unit 2a fails, the status data immediately preceding the failure is transmitted to the microcontroller 2d.

[0036] Next, an example of the operation of the drivable distance calculation system 1 of this embodiment will be described with reference to Figures 2 and 3.

[0037] Figure 2 is a flowchart illustrating the operation of the microcontroller 2d in the mileage calculation system 1 of this embodiment. Figure 3 is a flowchart illustrating the operation of the server device 3 in the mileage calculation system 1 of this embodiment.

[0038] As shown in Figure 2, the microcontroller 2d acquires the cell voltage value, temperature, and current value (step S1). Here, the microcontroller 2d acquires the cell voltage value from the cell voltage detection unit 2a, the temperature from the temperature sensor 2b, and the current value from the current sensor 2c. After acquiring the cell voltage value, temperature, and current value, the microcontroller 2d transmits the acquired cell voltage value, temperature, and current value to the server device 3.

[0039] Next, the microcontroller 2d determines whether or not a failure has occurred in the cell voltage detection unit 2a (step S2). For example, if the cell voltage value from the cell voltage detection unit 2a is interrupted at a time when the cell voltage value should normally be input, the microcontroller 2d determines that the cell voltage detection unit 2a has failed. If the microcontroller 2d does not determine in step S2 that the cell voltage detection unit 2a has failed, it returns to step S1 and continues to acquire the cell voltage value, temperature, and current value.

[0040] If a fault is determined to have occurred in step S2, the microcontroller 2d outputs a fault signal (step S3). Subsequently, the microcontroller 2d obtains fault line status data from the server device 3 (step S4). For example, the microcontroller 2d obtains the most recent status data from the server device 3 that is associated with a temperature that is the same as or close to the current temperature of the battery pack 110.

[0041] Next, the microcontroller 2d calculates the dischargeable amount and chargeable amount of the battery pack 110 based on the state data acquired in step S4 (step S5). For example, the microcontroller 2d calculates the chargeable current amount for each battery module M based on the charge rate and health, using pre-stored map data and calculation formulas, and uses these calculated current amounts as the dischargeable amount and chargeable amount. In step S5, the microcontroller 2d also calculates the driving range of the vehicle 100 based on the dischargeable amount. In other words, in this embodiment, the microcontroller 2d calculates the driving range of the vehicle 100 based on the charge rate of the latest battery module M, etc.

[0042] Next, the microcontroller 2d determines whether the current state of the vehicle 100 is in driving mode (step S6). Driving mode means that the power switch of the vehicle 100 is turned ON and the vehicle 100 is in a state where it can be driven.

[0043] If the microcontroller 2d determines in step S6 that the vehicle is in driving mode, it determines whether the accumulated discharge amount has exceeded the dischargeable amount (step S7). Here, the microcontroller 2d uses the accumulated value of the current input from the current sensor 2c while the vehicle 100 is running as the accumulated discharge amount. Furthermore, if this accumulated discharge amount exceeds the dischargeable amount calculated in step S5, the microcontroller 2d determines that the accumulated discharge amount has exceeded the dischargeable amount.

[0044] If the microcontroller 2d determines in step S7 that the accumulated discharge amount has exceeded the dischargeable amount, it outputs a signal to the higher-level control system indicating that it is necessary to stop the vehicle, and stops the vehicle (step S8).

[0045] After step S8, the microcontroller 2d returns to step S5 and updates the dischargeable amount and chargeable amount. On the other hand, if it is determined in step S7 that the accumulated discharge amount is not greater than the dischargeable amount, the microcontroller 2d returns to step S5 and updates the dischargeable amount and chargeable amount.

[0046] Furthermore, if the microcontroller 2d determines in step S6 that the vehicle is not in driving mode, it determines whether the current state of the vehicle 100 is in charging mode (step S9). Charging mode means that a charging device is connected to the vehicle 100 and the battery pack 110 is in a state where it can be charged.

[0047] If the microcontroller 2d determines in step S9 that it is not in charging mode, it returns to step S5 and repeats the determination of whether it is in driving mode and whether it is in charging mode. Meanwhile, the microcontroller 2d determines whether the accumulated charge amount has exceeded the chargeable amount (step S10). Here, the microcontroller 2d uses the accumulated value of the current input from the current sensor 2c while the vehicle 100 is running as the accumulated charge amount. Furthermore, the microcontroller 2d determines that the accumulated charge amount has exceeded the chargeable amount if this accumulated charge amount exceeds the chargeable amount calculated in step S5.

[0048] If the microcontroller 2d determines in step S7 that the accumulated charge amount has exceeded the chargeable amount, it outputs a signal to the higher-level control system indicating that charging needs to be stopped, and stops charging (step S11).

[0049] After step S11, the microcontroller 2d returns to step S5 and updates the dischargeable amount and chargeable amount. On the other hand, if it is determined in step S10 that the accumulated charge amount is not greater than the chargeable amount, the microcontroller 2d returns to step S5 and updates the dischargeable amount and chargeable amount.

[0050] As shown in Figure 3, the server device 3 acquires the cell voltage, temperature, and current values ​​(step S21). Here, the server device 3 acquires the cell voltage, temperature, and current values ​​when the microcontroller 2d receives the cell voltage, temperature, and current values ​​acquired in step S1 shown in Figure 2 from the communication unit 2e.

[0051] Next, the server device 3 creates state data for the battery pack 110 (step S22). Here, for each battery module M, the charge level and health are calculated in relation to temperature and acquisition time to create state data.

[0052] Next, the server device 3 determines whether or not it has received a fault signal (step S23). Here, the server device 3 determines that it has received a fault signal if a fault signal has been input from the microcontroller 2d via the communication unit 2e. If the server device 3 determines in step S23 that it has not received a fault signal, it repeats steps S21 and S22. As a result, status data is accumulated in the server device 3.

[0053] On the other hand, if the server device 3 determines in step S23 that it has received a fault signal, it transmits state data immediately before the fault (step S24). Here, the server device 3 transmits at least the state data created immediately before receiving the fault signal. The server device 3 may transmit multiple state data. Alternatively, the server device 3 may transmit only the state data associated with a temperature that is the same as or close to the temperature immediately before receiving the fault signal.

[0054] The driving range calculation system 1 of this embodiment, as described above, comprises a cell voltage detection unit 2a and a microcontroller 2d. The cell voltage detection unit 2a is connected to the battery pack 110. When the cell voltage detection unit 2a fails, the microcontroller 2d estimates the dischargeable amount of the battery pack 110 based on state data indicating the state of the battery pack 110 before the failure of the cell voltage detection unit 2a.

[0055] According to the mileage calculation system 1 of this embodiment, the amount of dischargeable battery pack 110 immediately after the failure of the cell voltage detection unit 2a is estimated based on the state data of the battery pack 110 before the failure of the cell voltage detection unit 2a. Therefore, according to the mileage calculation system 1 of this embodiment, unless the battery pack 110 is in its lowest charge state, the mileage of the vehicle 100 can be calculated to be longer than when the mileage is calculated assuming the battery pack 110 is in its lowest charge state. Thus, the mileage calculation system 1 of this embodiment makes it possible to increase the mileage after the failure of the cell voltage detection unit 2a that detects the voltage of the battery pack 110.

[0056] Furthermore, the mileage calculation system 1 of this embodiment includes a battery management device 2 mounted on the vehicle 100 together with the battery pack 110. The battery management device 2 includes a cell voltage detection unit 2a and a microcontroller 2d. With the mileage calculation system 1 of this embodiment, the battery management device 2 mounted on the vehicle 100 can manage the dischargeable amount and the mileageable amount. Therefore, communication between the vehicle 100 and the server device 3 after a failure of the cell voltage detection unit 2a can be minimized.

[0057] Furthermore, the driving range calculation system 1 of this embodiment includes a current sensor 2c that detects the current output from the battery pack 110. In addition, if the cell voltage detection unit 2a fails, the microcontroller 2d updates the dischargeable amount of the battery pack 110 based on the accumulated value of the current input from the current sensor 2c.

[0058] According to the driving range calculation system 1 of this embodiment, the change in the dischargeable amount can be calculated based on the integrated value of the current, even without using the cell voltage detection unit 2a. Therefore, even after the cell voltage detection unit 2a has failed, the dischargeable amount can be accurately calculated.

[0059] Furthermore, in the driving range calculation system 1 of this embodiment, the battery pack 110 is a rechargeable battery pack. In addition, if the cell voltage detection unit 2a fails, the microcontroller 2d estimates the rechargeable amount of the battery pack 110 based on the voltage data of the battery pack 110 before the cell voltage detection unit 2a failed.

[0060] According to the driving range calculation system 1 of this embodiment, the amount of charge that can be added to the battery pack 110 immediately after the cell voltage detection unit 2a fails is estimated. Therefore, according to the driving range calculation system 1 of this embodiment, even if a failure occurs in the cell voltage detection unit 2a, the battery pack 110 can be charged.

[0061] Furthermore, the driving range calculation system 1 of this embodiment includes a current sensor 2c that detects the current output from the battery pack 110. In addition, if the cell voltage detection unit 2a fails, the microcontroller 2d updates the chargeable amount of the battery pack 110 based on the accumulated value of the current input from the current sensor 2c.

[0062] According to the driving range calculation system 1 of this embodiment, the change in the amount of charge that can be charged can be calculated based on the integrated value of the current, even without using the cell voltage detection unit 2a. Therefore, even after the cell voltage detection unit 2a has failed, the amount of charge that can be charged can be calculated accurately.

[0063] Furthermore, the mileage calculation system 1 of this embodiment includes a server device 3 that is installed outside the vehicle 100 and can communicate with the battery management device 2. The server device 3 also receives detection results from the cell voltage detection unit 2a and creates status data.

[0064] According to the driving range calculation system 1 of this embodiment, it is not necessary for the microcontroller 2d to perform calculations to determine the charge level and health of the battery pack 110. Therefore, the driving range calculation system 1 of this embodiment can reduce the processing load on the microcontroller 2d.

[0065] Furthermore, the mileage calculation system 1 of this embodiment includes a temperature sensor 2b for measuring the temperature of the battery pack 110. The server device 3 also creates status data according to the temperature of the battery pack 110.

[0066] According to the driving range calculation system 1 of this embodiment, the amount of dischargeable battery can be estimated by taking into account the temperature dependence of the charge rate of the battery pack 110. Therefore, according to the driving range calculation system 1 of this embodiment, it is possible to estimate the amount of dischargeable battery more accurately.

[0067] Furthermore, in the driving range calculation system 1 of this embodiment, the status data includes the charge rate of the battery pack 110. Therefore, according to the driving range calculation system 1 of this embodiment, it is possible to estimate the dischargeable amount more accurately based on the charge rate.

[0068] Furthermore, in the driving range calculation system 1 of this embodiment, the status data includes the health status of the battery pack 110. Therefore, according to the driving range calculation system 1 of this embodiment, it is possible to estimate the discharge amount more accurately based on the health status.

[0069] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to the above embodiments. The shapes and combinations of the constituent members shown in the above embodiments are examples, and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0070] For example, the above embodiment described a configuration in which the state data includes charge level and health. However, the present invention is not limited thereto. For example, it is also possible to adopt a configuration that does not include state data. Furthermore, the state data only needs to be data that allows for the estimation of the dischargeable amount.

[0071] Furthermore, the above embodiment described a configuration for calculating the driving range based on the dischargeable amount. However, the present invention is not limited thereto. For example, the present invention only requires estimating the dischargeable amount and does not require calculating the driving range.

[0072] Furthermore, the above embodiment described a configuration in which the drivable distance calculation system 1 includes a server device 3. However, the present invention is not limited thereto. For example, the present invention may include a cell voltage detection unit 2a and a microcontroller 2d.

[0073] Furthermore, in the above embodiment, a configuration in which the battery management device 2 is equipped with a temperature sensor 2b has been described. However, the present invention is not limited thereto, and it is also possible to adopt a configuration in which the battery management device 2 receives temperature input from an external source.

[0074] Furthermore, in the above embodiment, a configuration in which the battery management device 2 is equipped with a current sensor 2c has been described. However, the present invention is not limited thereto, and it is also possible to adopt a configuration in which the battery management device 2 receives a current value from an external source.

[0075] Furthermore, the above embodiments can also be described, for example, as shown in the following appendix.

[0076] (Note 1) A voltage detection unit connected to the battery, If the voltage detection unit fails, a capacity estimation unit estimates the amount of dischargeable battery based on state data indicating the state of the battery before the voltage detection unit failed. A battery level estimation device characterized by comprising the following features.

[0077] (Note 2) The mobile unit is equipped with a battery management device along with the aforementioned battery, The battery management device comprises the voltage detection unit and the capacity estimation unit. The battery remaining charge estimation device according to Appendix 1, characterized by the features described above.

[0078] (Note 3) The system includes a current sensor that detects the current output from the aforementioned battery, The capacity estimation unit updates the dischargeable amount of the battery based on the integrated value of the current input from the current sensor when the voltage detection unit fails. The battery remaining charge estimation device according to Appendix 2, characterized by the features described above.

[0079] (Note 4) The aforementioned battery is a rechargeable storage battery, The battery remaining charge estimation device according to any one of the appendices 1 to 3, characterized in that, when the voltage detection unit fails, the capacity estimation unit estimates the chargeable amount of the battery based on the voltage data of the battery before the voltage detection unit failed.

[0080] (Note 5) The system includes a current sensor that detects the current output from the aforementioned battery, The capacity estimation unit updates the rechargeable battery capacity based on the integrated value of the current input from the current sensor when the voltage detection unit fails. A battery charge estimation device as described in Appendix 4, characterized by the features described herein.

[0081] (Note 6) The mobile body is equipped with an external installation device that is installed on the outside of the mobile body and is capable of communicating with the battery management device, The externally installed device receives the detection result from the voltage detection unit and creates the status data. The battery remaining charge estimation device according to Appendix 2, characterized by the features described above.

[0082] (Note 7) The battery is equipped with a temperature sensor that measures the temperature of the battery, The externally installed device generates the status data according to the temperature of the battery. The battery charge estimation device described in Appendix 6, characterized by the features described herein.

[0083] (Note 8) The battery remaining charge estimation device according to any one of appendices 1 to 7, characterized in that the state data includes the charge rate of the battery.

[0084] (Note 9) The battery remaining charge estimation device according to any one of the appendices 1 to 8, characterized in that the state data includes the health status of the battery. [Explanation of symbols]

[0085] 1... Driving range calculation system (battery charge estimation device), 2... Battery management device, 2a... Cell voltage detection unit (voltage detection unit), 2b... Temperature sensor, 2c... Current sensor, 2d... Microcontroller (capacity estimation unit), 2e... Communication unit, 3... Server device (external installation device), 100... Vehicle (mobile unit), 110... Battery pack (battery), M... Battery module

Claims

1. A voltage detection unit connected to the battery, If the voltage detection unit fails, a capacity estimation unit estimates the amount of dischargeable battery based on state data indicating the state of the battery before the voltage detection unit failed. A battery level estimation device characterized by comprising the following features.

2. The mobile unit is equipped with a battery management device along with the aforementioned battery, The battery management device comprises the voltage detection unit and the capacity estimation unit. The battery remaining charge estimation device according to claim 1, characterized by the features described above.

3. The system includes a current sensor that detects the current output from the aforementioned battery, The capacity estimation unit updates the dischargeable amount of the battery based on the integrated value of the current input from the current sensor when the voltage detection unit fails. The battery remaining charge estimation device according to claim 2.

4. The aforementioned battery is a rechargeable storage battery, The battery remaining charge estimation device according to any one of claims 1 to 3, characterized in that, when the voltage detection unit fails, the capacity estimation unit estimates the chargeable amount of the battery based on the voltage data of the battery before the voltage detection unit failed.

5. The system includes a current sensor that detects the current output from the aforementioned battery, The capacity estimation unit updates the rechargeable battery capacity based on the integrated value of the current input from the current sensor when the voltage detection unit fails. The battery charge estimation device according to feature 4.

6. The mobile body is equipped with an external installation device that is installed on the outside of the mobile body and is capable of communicating with the battery management device, The externally installed device receives the detection result from the voltage detection unit and creates the status data. The battery remaining charge estimation device according to claim 2.

7. The battery is equipped with a temperature sensor that measures the temperature of the battery, The externally installed device generates the status data according to the temperature of the battery. The battery charge estimation device according to claim 6.

8. The battery remaining charge estimation device according to any one of claims 1 to 3, characterized in that the state data includes the charge rate of the battery.

9. The battery remaining charge estimation device according to any one of claims 1 to 3, characterized in that the state data includes the health status of the battery.

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