Status detection device, status detection method, and status detection system

Abstract

To specify the relation between the degree of deterioration of a secondary battery and the life of the secondary battery according to a use history.SOLUTION: A state detector 1 is for detecting the state of a secondary battery 14 mounted in a vehicle. The state detector 1 includes: measurement means for measuring a temperature of a secondary battery 14 and a current and / or a voltage of the secondary battery; storage means for storing charge history information and discharge history information of the secondary battery 14 according to the temperature and the current and / or the voltage measured by the measurement means; a database for storing the relation between a use history of the secondary battery 14 and the life probability of the secondary battery 14 evaluated in advance; use history calculation means for calculating the use history of the secondary battery 14 from the charge history information and the discharge history information; and life probability calculation means for calculating the life probability of the secondary battery 14 from the use history and the database.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a condition detection device, a condition detection method, and a condition detection system. [Background technology]

[0002] Examples of inventions for determining deterioration and predicting the lifespan of a secondary battery include those disclosed in Patent Documents 1-3. The invention disclosed in Patent Document 1 stores a remaining lifespan map obtained in advance by experiment or simulation, and calculates the remaining lifespan of the storage battery using the remaining lifespan map corresponding to the usage history of the storage battery. The invention disclosed in Patent Document 2 estimates the number of times a secondary battery can be charged and discharged from a point in time to the end of its lifespan in the process of using the secondary battery by repeatedly charging and discharging it over time, and displays the date and time of replacement. The invention disclosed in Patent Document 3 acquires the value of the charge amount of the lead battery, the value of the discharge amount of the lead battery, and the value of the discharge depth of the lead battery, and determines the deterioration of the lead battery based on the charge amount acquisition value, the discharge amount acquisition value, and the discharge depth acquisition value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-020804 A [Patent Document 2] Japanese Patent Application Publication No. 6-089745 [Patent Document 3] Patent No. 6605008 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the inventions of Patent Documents 1 and 2, it is possible to know the remaining time of the life of the secondary battery, but it is not possible to know the degree of deterioration of the secondary battery. Also, according to the invention of Patent Document 3, it is possible to judge the deterioration of a lead battery, but it is not possible to know the remaining time of the life of the secondary battery.

[0005] The present invention has been made in view of the above, and has an object to specify the relationship between the degree of deterioration and the lifespan of a secondary battery according to its usage history. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the status detection device of the present invention is a status detection device that detects the status of a secondary battery mounted on a vehicle, and includes a measurement means for measuring the temperature and current and / or voltage of the secondary battery, a memory means for storing charging history information and discharging history information of the secondary battery according to the temperature and current and / or voltage measured by the measurement means, a database that stores a relationship between a usage history of the secondary battery that has been evaluated in advance and a life probability of the secondary battery, a usage history calculation means for calculating the usage history of the secondary battery from the charging history information and the discharging history information, and a life probability calculation means for calculating the life probability of the secondary battery from the usage history and the database.

[0007] In a state detection device according to one embodiment of the present invention, the life probability indicates the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, whose ratio of the actual capacity when new to the actual capacity is equal to or less than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, whose ratio of the actual capacity when new to the actual capacity is equal to or greater than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, whose starting voltage is equal to or less than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, whose internal resistance value is equal to or greater than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, whose ratio of the internal resistance value when new to the internal resistance value is equal to or less than a predetermined value; or the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, whose ratio of the internal resistance value when new to the internal resistance value is equal to or greater than a predetermined value.

[0008] A status detection device according to one embodiment of the present invention is characterized in that the usage history is composed of at least one of the charge amount of the secondary battery, the discharge amount of the secondary battery, and the time measured since the secondary battery was installed.

[0009] A status detection device according to one embodiment of the present invention is characterized in that the usage history is weighted by at least one of the temperature of the secondary battery, the SOC of the secondary battery, the SOH of the secondary battery, the rated capacity, the depth of discharge of the secondary battery, the OCV of the secondary battery, and the voltage of the secondary battery.

[0010] A status detection device according to one embodiment of the present invention is characterized in that it calculates the usage amount of the secondary battery per unit period from the usage history, and calculates the period until the secondary battery reaches its end of life or the life probability after a predetermined period of time based on the usage amount.

[0011] A status detection device according to one embodiment of the present invention is characterized in that it comprises an information transmitting means for transmitting the charging history information and the discharging history information to a server device storing the database via a control device, and a life probability receiving means for receiving from the server device via the control device the usage history of the secondary battery calculated in the server device from the charging history information and the discharging history information transmitted by the information transmitting means, and the life probability calculated in the server device from the database stored in the server device.

[0012] A status detection method according to one embodiment of the present invention is a status detection method for detecting the status of a secondary battery mounted on a vehicle, and includes a measurement step for measuring a temperature and current and / or voltage of the secondary battery, a storage step for storing charge history information and discharge history information of the secondary battery according to the temperature and current and / or voltage measured by the measurement step, a usage history calculation step for calculating a usage history of the secondary battery from the charge history information and the discharge history information, and a life probability calculation step for calculating a life probability of the secondary battery from the usage history and a database storing a relationship between a previously evaluated usage history of the secondary battery and a life probability of the secondary battery.

[0013] A status detection system according to one aspect of the present invention is a status detection system having a status detection device and a server device, and detecting the status of a secondary battery mounted on a vehicle, wherein the status detection device has a measurement means for measuring a temperature and a current and / or voltage of the secondary battery, a memory means for storing charge history information and discharge history information of the secondary battery according to the temperature and current and / or voltage measured by the measurement means, an information transmission means for transmitting the charge history information and the discharge history information to the server device via a control device, and a life probability receiving means for receiving a life probability transmitted from the server device via the control device, and the server device has an information receiving means for receiving the charge history information and the discharge history information transmitted by the information transmission means, a database storing a relationship between a usage history of the secondary battery evaluated in advance and the life probability of the secondary battery, a usage history calculation means for calculating a usage history of the secondary battery from the charge history information and the discharge history information received by the information receiving means, a life probability calculation means for calculating a life probability of the secondary battery from the usage history and the database, and a life probability transmission means for transmitting the life probability to the status detection device. Effect of the Invention

[0014] According to the present invention, it is possible to identify the relationship between the degree of deterioration and the lifespan of a secondary battery according to its usage history. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing a power supply system of a vehicle having a state detection device according to an embodiment. [Diagram 2] FIG. 2 is a block diagram showing the configuration of a control unit included in the state detection device. [Diagram 3] FIG. 3 is a diagram illustrating an example of the charging history information. [Figure 4] FIG. 4 is a diagram illustrating an example of the discharge history information. [Diagram 5] FIG. 5 is a diagram illustrating an example of the weighting table. [Figure 6] FIG. 6 is a diagram illustrating an example of the database. [Figure 7] FIG. 7 is a flowchart showing the flow of the process performed by the control unit. [Figure 8] FIG. 8 is a diagram showing an example of the relationship between the passage of time and the passage of the cumulative usage history. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiment described below. In addition, in the description of the drawings, the same or corresponding elements are appropriately designated by the same reference numerals.

[0017] [Embodiment] (Configuration of the embodiment) 1 is a diagram showing a power supply system of a vehicle having a state detection device according to an embodiment of the present invention. The state detection device 1 according to the embodiment has a control unit 10, a voltage sensor 11, a current sensor 12, a temperature sensor 13, and a discharge circuit 15. The state detection device 1 identifies the life of a rechargeable secondary battery 14 mounted on the vehicle based on the measurement results of the voltage sensor 11, the current sensor 12, and the temperature sensor 13. Note that the control unit 10, the voltage sensor 11, the current sensor 12, the temperature sensor 13, and the discharge circuit 15 may not be configured separately, but some or all of them may be configured together.

[0018] The engine 17 is, for example, a reciprocating engine such as a gasoline engine or a diesel engine, or a rotary engine, etc. The engine 17 is started by a starter motor 18, drives the drive wheels via the transmission, and provides propulsive force to the vehicle, while also driving the alternator 16 to generate electric power.

[0019] The starter motor 18 is, for example, a DC motor, and generates a rotational force by the power supplied from the secondary battery 14 to start the engine 17. The alternator 16 is driven by the engine 17, generates AC power, converts it to DC power by a rectifier circuit, and charges the secondary battery 14. The alternator 16 is controlled by the control unit 10, and is capable of adjusting the generated voltage.

[0020] The load 19 is constituted by, for example, an electric steering motor, a defogger, a seat heater, an ignition coil, a car audio, a car navigation system, and the like, and operates using power supplied from the secondary battery 14.

[0021] The secondary battery 14 is a rechargeable battery having an electrolyte, and is composed of, for example, a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, etc. The secondary battery 14 is charged by an alternator 16, and drives a starter motor 18 to start an engine 17 and supplies power to a load 19. The secondary battery 14 is composed of a plurality of cells connected in series.

[0022] 1, the vehicle is configured so that only the engine 17 outputs driving force, but the vehicle may be, for example, a hybrid vehicle equipped with an electric motor that assists the engine 17. In the case of a hybrid vehicle, the secondary battery 14 starts up a high-voltage system (a system that drives an electric motor) that is configured with a lithium battery or the like, and the high-voltage system starts the engine 17.

[0023] The voltage sensor 11 detects the terminal voltage of the secondary battery 14, and outputs a signal indicating the detected voltage to the control unit 10. The current sensor 12 detects the current flowing through the secondary battery 14, and outputs a signal indicating the detected current to the control unit 10. The temperature sensor 13 detects the temperature of the electrolyte of the secondary battery 14 or the temperature around the secondary battery 14, and outputs a signal indicating the detected temperature to the control unit 10.

[0024] The discharge circuit 15 is composed of, for example, a semiconductor switch and a resistive element connected in series, and discharges the secondary battery 14 at a predetermined current by turning the semiconductor switch on / off according to the control of the control unit 10.

[0025] The control unit 10 acquires signals from the voltage sensor 11, the current sensor 12, and the temperature sensor 13, and calculates the life probability of the secondary battery 14 and the number of days until the end of the life using the acquired signals. The control unit 10 also controls the state of charge of the secondary battery 14 by controlling the power generation voltage of the alternator 16. Note that, instead of the control unit 10 controlling the state of charge of the secondary battery 14 by controlling the power generation voltage of the alternator 16, for example, an ECU (Electric Control Unit) (not shown) may control the state of charge.

[0026] Fig. 2 is a diagram showing a detailed configuration example of the control unit 10 shown in Fig. 1. As shown in this diagram, the control unit 10 has a CPU (Central Processing Unit) 10a, a ROM (Read Only Memory) 10b, a RAM (Random Access Memory) 10c, a communication unit 10d, an interface 10e, a storage unit 10f, and a bus 10g. Note that instead of the CPU 10a, the control unit 10 may be configured with a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or the like.

[0027] The bus 10g is a group of signal lines that interconnect the CPU 10a, ROM 10b, RAM 10c, communication unit 10d, interface 10e, and storage unit 10f, and enables information to be exchanged among them. The communication unit 10d communicates with a higher-level device such as an ECU (Electronic Control Unit), and notifies the higher-level device of information detected by the state detection device 1, information related to the life of the secondary battery 14 identified by the state detection device 1, and control information. The interface 10e converts signals supplied from the voltage sensor 11, current sensor 12, and temperature sensor 13 into digital signals and acquires them, and supplies drive currents to the discharge circuit 15, alternator 16, starter motor 18, and the like to control them.

[0028] The ROM 10b is composed of a non-volatile semiconductor memory or the like, and stores the program 10ba, etc. The CPU 10a controls each part based on the program 10ba stored in the ROM 10b. The CPU 10a executing the program 10ba also calculates the life probability and the number of days until the end of the life of the secondary battery 14 using a signal acquired by the interface 10e.

[0029] The RAM 10c is composed of a semiconductor memory or the like, and stores data generated when the CPU 10a executes the program 10ba and history data 10ca of the secondary battery 14. The RAM 10c is an example of a storage means. The history data 10ca is, for example, data such as the elapsed time since the start of use of the secondary battery 14, the vehicle's running time (e.g., the accumulated time when the vehicle's engine 17 is running), the vehicle's stopped time (e.g., the accumulated time when the vehicle's engine 17 is not running), the charging time (e.g., the start and end dates and times of charging and the accumulated time of the charging state), the discharging time (e.g., the start and end dates and times of discharging and the accumulated time of the discharging state), the charging history information (e.g., the accumulated amount of electricity flowing into the secondary battery 14 by charging), the discharging history information (e.g., the accumulated amount of electricity flowing out of the secondary battery 14 by discharging), and the temperature of the secondary battery 14.

[0030] The control unit 10 receives, at a predetermined cycle, the time measured by a timer realized by the CPU 10a that executes the program 10ba, and signals output from the voltage sensor 11, the current sensor 12, and the temperature sensor 13, and measures the voltage, current, and temperature of the secondary battery 14. The control unit 10, the voltage sensor 11, the current sensor 12, and the temperature sensor 13 are an example of measurement means. Further, based on the received time and signals, the control unit 10 acquires the elapsed time, running time, stop time, charging time, discharging time, charging history information, discharging history information, temperature, and other latest measured values included in the history data 10ca, and adds the acquired measured values to the cumulative values stored until the previous measurement to update the history data 10ca. By repeatedly executing this process by the control unit 10, the history data 10ca is appropriately maintained in the latest state even during the running of the vehicle (including a temporary stop state, the period from the start to the end of the vehicle operation).

[0031] FIG. 3 is a diagram showing an example of the charging history information included in the history data 10ca, and FIG. 4 is a diagram showing an example of the discharging history information included in the history data 10ca. The charging history information is the integrated amount of electricity charged for each voltage range and temperature range of the secondary battery 14. For example, when the temperature Te of the secondary battery 14 is in the range of T3 ≤ Te < T4, the voltage V is in the range of V2 ≤ V < V3, and the secondary battery 14 is charged at +2 A for 2 hours, the control unit 10 adds 4 Ah, which is the amount of electricity charged to the charging history information Qc_23 shown in FIG. 3, to update the charging history information.

[0032] The discharging history information is the integrated amount of electricity discharged for each voltage range and temperature range of the secondary battery 14. For example, when the temperature Te of the secondary battery 14 is in the range of T3 ≤ Te < T4, the voltage V is in the state of V2 ≤ V < V3, and the secondary battery 14 is discharged at -2 A for 2 hours, the control unit 10 adds -4 Ah, which is the amount of electricity discharged, to the discharging history information Qd_23 shown in FIG. 4 to update the discharging history information. Further, the control unit 10 updates each time by adding the acquired latest time to the time until the previous cycle for the elapsed time, running time, stop time, charging time, and discharging time.

[0033] Returning to FIG. 2, the storage unit 10f is composed of a non-volatile memory and stores a weighting table TB and a database 10fa. FIG. 5 is a diagram showing an example of the weighting table TB, and FIG. 6 is a diagram showing an example of the database 10fa.

[0034] The weighting table TB is a table that stores weights used when calculating the cumulative usage history described later. The weighting table TB is a table that stores values to be weighted for each voltage range and temperature range of the secondary battery 14. For example, when the temperature T of the secondary battery 14 is in the range of T3 ≦ T < T4 and the voltage V is in the state of V2 ≦ V < V3, the control unit 10 weights the charge history information Qc_23 and the discharge history information Qd_23 with the value of w_23 shown in FIG. 5 to calculate the cumulative usage history.

[0035] The database 10fa is a database used for calculating the life probability of the secondary battery 14 and the number of days until the end of life, and is an example of a database showing the relationship between the cumulative usage history and the life probability. The life probability is defined as the value represented by the measured capacity / the measured capacity at the time of new product as the healthiness. Among a plurality of secondary batteries 14 evaluated in advance for use, it shows the ratio of the number of secondary batteries 14 that have become equal to or less than a predetermined healthiness with use. When the predetermined healthiness is regarded as the life of the secondary battery, the life probability can be said to be the ratio of the secondary batteries 14 that have reached the end of life. Note that the database 10fa may be configured to be stored in the ROM 10b instead of being stored in the storage unit 10f. Also, the database 10fa may be configured to be stored in the storage unit 10f as a function representing the life probability. In this case, the life probability can be calculated by substituting the value of the cumulative usage history into the function of the life probability.

[0036] The database 10fa shown in Fig. 6 assumes that a secondary battery 14 with a health level of 0.5 or less has reached the end of its life, and shows the relationship between the accumulated usage history and the life probability, described below, for a plurality of secondary batteries 14. In the case of the database 10fa shown in Fig. 6, for a plurality of pre-evaluated secondary batteries 14, the life probability is 50% when the accumulated usage history is Qx. In this case, it can be seen that when the accumulated usage history is Qx, half of the pre-evaluated secondary batteries 14 have reached the end of their life.

[0037] (Example of operation of embodiment) Next, an operation example of this embodiment will be described. Fig. 7 is a flowchart showing a process flow in which the control unit 10 specifies the life probability and the number of days until the end of the life of the secondary battery 14. The control unit 10 executes the process shown in Fig. 7 at a predetermined cycle.

[0038] First, the control unit 10 acquires signals output from the voltage sensor 11, the current sensor 12, and the temperature sensor 13, and measures the terminal voltage of the secondary battery 14, the current flowing through the secondary battery 14, and the electrolyte or ambient temperature of the secondary battery 14 (step S101). Step S101 is an example of a measurement step. Next, the control unit 10 updates the history data 10ca based on the time measured by the timer and the acquired voltage, current, and temperature, and updates the charging history information and discharging history information included in the history data 10ca (step S102). Step S102 is an example of a storage step for storing the charging history information and discharging history information.

[0039] After step S102, the control unit 10 calculates the usage history Q by using the charging history information, the discharging history information, and the weighting table TB according to, for example, the following formula 1 (step S103). In formula 1, w_kl is the weight stored in the weighting table TB, Qc_kl is the charging history information shown in Fig. 3 and included in the history data 10ca, and Qd_kl is the discharging history information shown in Fig. 4 and included in the history data 10ca. Since the secondary battery 14 deteriorates at high temperatures, the weight stored in the weighting table TB becomes larger as the temperature increases.

number

[0040] The control unit 10 divides the usage history Q calculated in step S103 by the initial full charge capacity of the secondary battery 14 stored in advance in the storage unit 10f to calculate a normalized accumulated usage history (step S104). The accumulated usage history is an example of the time measured after the secondary battery 14 is attached, and is an example of the usage history of the secondary battery 14. The control unit 10 is an example of a usage history calculation means that calculates the usage history Q and the accumulated usage history. Steps S103 and S104 are also an example of a usage history calculation step that calculates the usage history.

[0041] Next, the control unit 10 calculates the life probability of the secondary battery 14 at the current time point by using the accumulated usage history calculated in step S104 and the database fa shown in FIG. 6 (step S105). Step S105 is an example of a life probability calculation step for calculating the life probability of the secondary battery 14. The control unit 10 calculates the life probability by performing the process of step S105, and can calculate the ratio of the secondary batteries 14 that have reached the end of their life in the calculated accumulated usage history. Here, the control unit 10 functions as an example of a life probability calculation means for calculating the life probability of the secondary battery 14. For example, when the calculation result of the accumulated usage history at the current time point is Qn, the life probability is 25% when referring to the database fa in FIG. 6. In this case, it is calculated that, in the accumulated usage history at the current time point, 25% of the secondary batteries 14 among the multiple secondary batteries 14 previously evaluated have reached the end of their life.

[0042] Next, the control unit 10 uses the cumulative usage history calculated in step S104 to calculate a daily usage history of the secondary battery 14 (step S106). Fig. 8 is a graph showing the relationship between the passage of time and the progress of the calculated cumulative usage history. The control unit 10 stores the calculation history of the cumulative usage history in the storage unit 10f, and when the cumulative usage history during the period from the present time (tn) to a time T days ago (tp) is q, the control unit 10 can obtain the daily usage history of the secondary battery 14 by calculating q / T.

[0043] Next, the control unit 10 calculates the life probability at a future time point using the daily usage history calculated in step S106 (step S107). Specifically, when calculating the life probability at a future time point t days from the present time, the control unit 10 first uses the cumulative usage history calculated in step S104 and the daily usage history calculated in step S106 to calculate the current cumulative usage history + daily usage history * t days. Through this calculation, the control unit 10 calculates the cumulative usage history after t days (Qn + (q / T) * t). Next, the control unit 10 refers to the database fa and calculates the life probability (p) corresponding to the acquired cumulative usage history after t days.

[0044] Next, the control unit 10 calculates the number of days until a predetermined life probability is reached by using the daily usage history calculated in step S106 (step S108). Specifically, when calculating the number of days until the life probability reaches a predetermined 50%, for example, the control unit 10 calculates the cumulative usage history (Qx) when the life probability is 50% by referring to the database fa, and performs a calculation of (cumulative usage history when the life probability is 50%-current cumulative usage history) / daily usage history. Through this calculation, the control unit 10 calculates the number of days from the current time until the life probability reaches 50%. If the time when the life probability reaches 50% is defined as the life of the secondary battery 14, the calculation in step S108 can obtain the number of days until the secondary battery 14 reaches the end of its life.

[0045] Next, the control unit 10 notifies the ECU of the current life probability calculated in step S105, the life probability after t days calculated in step S107, and the number of days until the predetermined life probability is reached calculated in step S108 (step S109). The ECU may display the life probability and the number of days notified by the control unit 10 on an instrument panel.

[0046] According to this embodiment, it is possible to estimate the degree of deterioration of the secondary battery 14 by calculating the life probability according to the cumulative usage history of the secondary battery 14. Also, according to this embodiment, it is possible to estimate the future degree of deterioration of the secondary battery 14 by calculating the future life probability, and obtain the number of days until the secondary battery 14 reaches the end of its life.

[0047] [Variations] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment and can be implemented in various other forms. For example, the above-mentioned embodiment may be modified as follows to implement the present invention. The above-mentioned embodiment and the following modifications may be combined with each other. The present invention also includes a configuration in which the components of the above-mentioned embodiments and modifications are appropriately combined. Further effects and modifications can be easily derived by a person skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-mentioned embodiment and modifications, and various modifications are possible.

[0048] In the above-described embodiment, the database 10fa may be acquired from the outside through wired or wireless communication by the communication unit 10d and stored in the storage unit 10f. According to this configuration, the database 10fa corresponding to the secondary battery 14 mounted on the vehicle is stored in the storage unit 10f, and the life probability of the secondary battery 14 and the number of days until the secondary battery 14 reaches the end of its life can be obtained.

[0049] In the above-described embodiment, the charge history information and the discharge history information store the integrated value of the amount of electricity for each voltage range and temperature range of the secondary battery 14, but instead of the voltage range of the secondary battery, the integrated value of the amount of electricity for each SOC (State Of Charge) range and temperature range of the secondary battery may be stored. In this configuration, the weighting table TB stores weighting values ​​for each SOC (State Of Charge) range and temperature range of the secondary battery instead of the voltage range of the secondary battery. When the secondary battery 14 is used in a low SOC state, deterioration of the secondary battery 14 progresses more rapidly than when the secondary battery is used in a high SOC state, so in this case, the weighting value is larger as the range of the SOC value becomes smaller, i.e., the charging rate becomes lower. Alternatively, instead of the temperature range, the integrated value of the amount of electricity may be stored for each range of the SOH (State of Health) of the secondary battery 14, the rated capacity, the SOC range, the depth of discharge range, the OCV range, or the voltage range at the start of the engine 17, and a weighting value may be stored in the weighting table TB for each range of the SOC, the depth of discharge range, the OCV range, or the voltage range at the start of the engine 17, and weighting may be performed by the SOC, the depth of discharge, or the voltage at the start of the engine 17.

[0050] In the above-described embodiment, when calculating the usage history Q, the charging history information and the discharging history information are used, but a configuration may be adopted in which only one of the charging history information and the discharging history information is used. Furthermore, an integrated value of the charging time and the discharging time may be stored for each temperature range, and the calculation result obtained by weighting the stored integrated value may be used as the usage history Q. Furthermore, an integrated value of the elapsed time since the start of use of the secondary battery 14 may be stored for each temperature range, and the calculation result obtained by weighting the stored integrated value may be used as the usage history Q. These values ​​calculated from the charging time, the discharging time, and the elapsed time are also examples of the time measured since the secondary battery 14 was attached.

[0051] In the above-described embodiment, the life probability is defined as the degree of health of a number of secondary batteries 14 that have become equal to or lower than a predetermined degree of health with use among a number of secondary batteries 14 previously evaluated for use, but for example, the life probability may be defined as the degree of health of a number of secondary batteries 14 that have become equal to or higher than a predetermined degree of health with use among a number of secondary batteries 14 previously evaluated for use, or may be the proportion of the number of secondary batteries with the same usage history that have a voltage at start-up that is equal to or lower than a predetermined value. Also, the life probability may be the proportion of the number of secondary batteries with the same usage history that have an internal resistance value equal to or higher than a predetermined value, the proportion of the number of secondary batteries with the same usage history that have a ratio of the internal resistance value when new to the internal resistance value equal to or lower than a predetermined value, or the proportion of the number of secondary batteries with the same usage history that have a ratio of the internal resistance value when new to the internal resistance value equal to or higher than a predetermined value.

[0052] In the above-described embodiment, the state detection device 1 provided in the vehicle calculates the current life probability, the future life probability, and the number of days until the predetermined life probability is reached, but the calculation is not limited to the state detection device 1. For example, the state detection device 1 transmits the history data 10ca to a server device providing a cloud service via an ECU, a communication interface, and a mobile communication network provided in the vehicle. In this case, the CPU 10a, the communication unit 10d, and the ECU function as information transmission means. The ECU is an example of a control device. The server device also stores a database 10fa. The database 10fa stored in the server device may be updated based on the history data 10ca of a vehicle that was previously used. The server device receives the history data 10ca transmitted from the ECU via the communication interface. The server device, like the control unit 10, calculates the current life probability, the future life probability, and the number of days until the predetermined life probability is reached using the received history data 10ca and the stored database 10fa. The server device may transmit the calculated life probability and number of days to an ECU equipped in the vehicle, and the ECU may transmit the received life probability to the CPU 10a, and display the life probability and number of days transmitted from the server device on an instrument panel. In this case, the CPU of the server device functions as a history information receiving means, a usage history calculating means, a life probability calculating means, and a life probability transmitting means. The state detection device 1 and the server device are an example of a state detection system. In addition, the server device may calculate the usage history Q or the normalized cumulative usage history, and transmit the calculation result to the state detection device 1 equipped in the vehicle, and the state detection device 1 may calculate the current life probability, the future life probability, and the number of days until a predetermined life probability is reached using the usage history Q or the normalized cumulative usage history transmitted from the server device and the stored database 10fa. In addition, the server device may transmit the calculated life probability and number of days to a mobile terminal owned by a user of the vehicle, rather than to an ECU equipped in the vehicle, and the mobile terminal may display the transmitted life probability and number of days.Furthermore, the history data 10ca may be updated by transmitting the measured time, the measured voltage, the measured current, the measured temperature, and the like to a server device, and the server device may update the history data 10ca. [Explanation of symbols]

[0053] 1. Status detection device 10 Control section 10a CPU 10b ROM 10ba Program 10c RAM 10ca Historical Data 10d Communications Department 10e Interface 10f storage section 10fa database 10g Bus 11 Voltage Sensor 12 Current Sensor 13 Temperature Sensor 14 Secondary battery 15 Discharge circuit 16 Alternator 17 Engine 18 Starter motor 19 Load TB Weighting Table

Claims

1. A state detection device that detects a state of a secondary battery mounted on a vehicle, comprising: A measuring means for measuring a temperature and a current and / or a voltage of the secondary battery; a storage means for storing charge history information and discharge history information of the secondary battery according to the temperature and the current and / or voltage measured by the measuring means; a database storing a relationship between a usage history of the secondary battery evaluated in advance and a life probability of the secondary battery; a usage history calculation means for calculating a usage history of the secondary battery from either the charging history information or the discharging history information, or from the charging history information and the discharging history information; a life probability calculation means for calculating a life probability of the secondary battery from the usage history and the database; A state detection device comprising:

2. The life probability indicates the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, in which the ratio of the actual capacity when new to the actual capacity is equal to or less than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, in which the ratio of the actual capacity when new to the actual capacity is equal to or more than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, in which the voltage at the start of the engine mounted on the vehicle is equal to or less than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, in which the internal resistance value is equal to or more than a predetermined value; the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, in which the ratio of the internal resistance value when new to the internal resistance value is equal to or less than a predetermined value; or the proportion of the number of secondary batteries among multiple secondary batteries with the same usage history, in which the ratio of the internal resistance value when new to the internal resistance value is equal to or more than a predetermined value. The state detection device according to claim 1 .

3. The charging history information is a charging amount of the secondary battery, and the discharging history information is a discharging amount of the secondary battery. The state detection device according to claim 1 or 2.

4. The usage history is weighted by at least one of the temperature of the secondary battery, the SOC of the secondary battery, the SOH of the secondary battery, the rated capacity, the depth of discharge of the secondary battery, the OCV of the secondary battery, and the voltage of the secondary battery at the start of an engine mounted on the vehicle. The state detection device according to any one of claims 1 to 3.

5. A usage amount of the secondary battery per unit period is calculated from the usage history, and a period until the secondary battery reaches its end of life or a life probability after a predetermined period is calculated based on the usage amount. The state detection device according to any one of claims 1 to 4.

6. A state detection method for detecting a state of a secondary battery mounted on a vehicle, comprising: a measuring step of measuring a temperature and a current and / or a voltage of the secondary battery; a storage step of storing charge history information and discharge history information of the secondary battery according to the temperature and the current and / or voltage measured in the measurement step; a usage history calculation step of calculating a usage history of the secondary battery from either the charging history information or the discharging history information, or from the charging history information and the discharging history information; a life probability calculation step of calculating a life probability of the secondary battery from the usage history and a database storing a relationship between a usage history of the secondary battery previously evaluated and a life probability of the secondary battery; A state detection method comprising:

7. A status detection system having a status detection device and a server device, and detecting a status of a secondary battery mounted on a vehicle, The state detection device is A measuring means for measuring a temperature and a current and / or a voltage of the secondary battery; a storage means for storing charge history information and discharge history information of the secondary battery according to the temperature and the current and / or voltage measured by the measuring means; an information transmitting means for transmitting the charging history information and the discharging history information to the server device via a control device; a life probability receiving means for receiving the life probability transmitted from the server device via the control device; having The server device includes: an information receiving means for receiving the charging history information and the discharging history information transmitted by the information transmitting means; a database storing a relationship between a usage history of the secondary battery evaluated in advance and a life probability of the secondary battery; a usage history calculation means for calculating a usage history of the secondary battery from either the charging history information or the discharging history information received by the information receiving means, or from the charging history information and the discharging history information; a life probability calculation means for calculating a life probability of the secondary battery from the usage history and the database; a lifetime probability transmitting means for transmitting the lifetime probability to the condition detection device; have Condition detection system.

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