JP7672212B2 - Status detection device, status detection method, and status detection system - Google Patents

Description

The present invention relates to a status detection device, a status detection method, and a status detection system.

Inventions that determine the deterioration and predict the lifespan of secondary batteries are disclosed in, for example, Patent Documents 1-3. The invention disclosed in Patent Document 1 stores a remaining lifespan map determined 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 the secondary battery can be charged and discharged from the time when it is used by repeatedly charging and discharging it over time until it reaches the end of its lifespan, 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 judges the deterioration of the lead battery based on the acquired charge amount value, the acquired discharge amount value, and the acquired discharge depth value.

JP 2014-020804 A Japanese Patent Application Publication No. 6-089745 Patent No. 6605008

The inventions of Patent Documents 1 and 2 make it possible to know the time remaining until the end of the life of a secondary battery, but do not allow the degree of deterioration of the secondary battery to be known. Furthermore, the invention of Patent Document 3 makes it possible to determine the deterioration of a lead battery, but does not allow the time remaining until the end of the life of the secondary battery to be known.

The present invention has been made in consideration of the above, and aims to identify the relationship between the degree of deterioration and lifespan of a secondary battery according to its usage history.

In order to solve the above-mentioned problems and achieve the object, the state detection device according to the present invention is a state detection device that detects the state 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 storage 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, a database that stores the relationship between the usage history of the secondary battery evaluated in advance and the 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.

In one aspect of the present invention, the state detection device is characterized in that the life probability indicates the proportion of the number of secondary batteries with the same usage history in which the ratio of the actual capacity when new to the actual capacity when new is equal to or less than a predetermined value, the proportion of the number of secondary batteries with the same usage history in which the ratio of the actual capacity when new to the actual capacity when new is equal to or more than a predetermined value, the proportion of the number of secondary batteries with the same usage history in which the voltage at start-up is equal to or less than a predetermined value, the proportion of the number of 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 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 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 one aspect 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.

The state detection device according to one aspect 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.

The state detection device according to one aspect 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 based on the usage amount.

The state detection device according to one aspect of the present invention is characterized by comprising: an information transmission 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 transmission means, and the life probability calculated in the server device from the database stored in the server device.

A state detection method according to one aspect of the present invention is a state detection method for detecting the state of a secondary battery mounted on a vehicle, and includes a measurement step for measuring the 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 the usage history of the secondary battery from the charge history information and the discharge history information, and a life probability calculation step for calculating the life probability of the secondary battery from the usage history and a database storing the relationship between the usage history of the secondary battery evaluated in advance and the life probability of the secondary battery.

The state detection system according to one aspect of the present invention includes a state detection device and a server device, and is a state detection system for detecting the state of a secondary battery mounted on a vehicle. The state detection device includes a measuring means for measuring the temperature and current and/or 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 current and/or voltage measured by the measuring means, an information transmitting 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 the life probability transmitted from the server device via the control device. The server device includes an information receiving means for receiving the charge history information and the discharge history information transmitted by the information transmitting means, a database storing the relationship between the usage history of the secondary battery evaluated in advance and the life probability of the secondary battery, a usage history calculating means for calculating the 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 calculating means for calculating the life probability of the secondary battery from the usage history and the database, and a life probability transmitting means for transmitting the life probability to the state detection device.

The present invention makes it possible to identify the relationship between the degree of deterioration of a secondary battery and its lifespan according to its usage history.

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

The following describes in detail an embodiment of the present invention with reference to the drawings. Note that the present invention is not limited to the embodiment described below. In addition, in the drawings, the same or corresponding elements are appropriately designated by the same reference numerals.

[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 as separate components, but some or all of them may be configured as a single unit.

The engine 17 is, for example, a reciprocating engine such as a gasoline engine or a diesel engine, or a rotary engine. 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 electricity.

The starter motor 18 is, for example, a DC motor, and generates rotational force using 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 using 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.

The load 19 is composed of, for example, an electric steering motor, a defogger, a seat heater, an ignition coil, a car audio system, a car navigation system, etc., and operates using power supplied from the secondary battery 14.

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

In the example of FIG. 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 a high-voltage system (a system that drives an electric motor) that is composed of a lithium battery or the like, and the high-voltage system starts the engine 17.

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 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.

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 and off according to the control of the control unit 10.

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 its life using the acquired signals. The control unit 10 also controls the charging state 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 charging state 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 charging state.

Figure 2 is a diagram showing a detailed configuration example of the control unit 10 shown in Figure 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 using a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or the like.

The bus 10g is a group of signal lines that interconnect the CPU 10a, ROM 10b, RAM 10c, communication unit 10d, interface 10e, and memory unit 10f, enabling information to be exchanged between 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 current to the discharge circuit 15, alternator 16, starter motor 18, etc. to control them.

The ROM 10b is composed of a non-volatile semiconductor memory or the like, and stores the program 10ba and the like. The CPU 10a controls each part based on the program 10ba stored in the ROM 10b. In addition, the CPU 10a executing the program 10ba 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.

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.

The control unit 10 receives the time measured by the timer realized by the CPU 10a executing the program 10ba and the signals output from the voltage sensor 11, the current sensor 12, and the temperature sensor 13 at a predetermined cycle, 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 examples of measuring means. In addition, the control unit 10 obtains the latest measured values such as the elapsed time, driving time, stop time, charging time, discharging time, charging history information, discharging history information, and temperature contained in the history data 10ca based on the received time and signal, and adds the obtained measured values to the cumulative values stored up to 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 kept up to date even while the vehicle is traveling (the period from the start to the end of driving the vehicle, including a temporary stop state).

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

The discharge history information is the sum of the 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 within the range of T3≦Te<T4, the voltage V is in a state of V2≦V<V3, and the secondary battery 14 has been discharged at -2A for 2 hours, the control unit 10 adds -4Ah, which is the amount of electricity discharged, to the discharge history information Qd_23 shown in FIG. 4, and updates the discharge history information. The control unit 10 also updates each time for the elapsed time, driving time, stopped time, charging time, and discharging time by adding the most recently acquired time to the time up to the previous cycle.

Returning to FIG. 2, the storage unit 10f is configured with 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.

The weighting table TB is a table that stores weights used when calculating the cumulative usage history, which will be described later. The weighting table TB is a table that stores weighting values for each voltage range and temperature range of the secondary battery 14. For example, the control unit 10 weights the charging history information Qc_23 and discharging history information Qd_23 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, using the value of w_23 shown in FIG. 5, and calculates the cumulative usage history.

The database 10fa is used to calculate the life probability and the number of days until the end of the life of the secondary battery 14, 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 health level, and indicates the proportion of the number of secondary batteries 14 that have fallen below a predetermined health level as a result of use, among multiple secondary batteries 14 that have been evaluated in advance for use, where the predetermined health level is the life of the secondary battery, and the life probability can be said to be the proportion of secondary batteries 14 that have reached the end of their life. Note that the database 10fa may be configured to be stored in the ROM 10b, rather than in the storage unit 10f. The database 10fa may also 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.

The database 10fa shown in FIG. 6 shows the relationship between the cumulative usage history and the lifespan probability, described below, for multiple secondary batteries 14, assuming that a secondary battery 14 with a health level of 0.5 or less has reached the end of its lifespan. In the case of the database 10fa shown in FIG. 6, for multiple secondary batteries 14 previously evaluated, the lifespan probability is 50% when the cumulative usage history is Qx. In this case, it can be seen that when the cumulative usage history is Qx, half of the multiple secondary batteries 14 previously evaluated have reached the end of their lifespan.

(Operation Example of the 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.

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.

After step S102, the control unit 10 calculates the usage history Q by using the charge history information, the discharge 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 charge history information shown in Fig. 3 included in the history data 10ca, and Qd_kl is the discharge history information shown in Fig. 4 included in the history data 10ca. Note that since the secondary battery 14 deteriorates at high temperatures, the weight stored in the weighting table TB becomes larger as the temperature increases.

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 cumulative usage history (step S104). The cumulative usage history is an example of the time measured since the secondary battery 14 was 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 cumulative usage history. Steps S103 and S104 are also an example of a usage history calculation step that calculates the usage history.

Next, the control unit 10 calculates the life probability of the secondary battery 14 at the current time point using the cumulative 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 percentage of the secondary batteries 14 that have reached the end of their life in the calculated cumulative 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 cumulative 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 cumulative usage history at the current time point, 25% of the secondary batteries 14 evaluated in advance have reached the end of their life.

Next, the control unit 10 uses the cumulative usage history calculated in step S104 to calculate the 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 history of the calculation of the cumulative usage history in the memory 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 daily usage history of the secondary battery 14 can be obtained by calculating q/T.

Next, the control unit 10 uses the daily usage history calculated in step S106 to calculate the lifespan probability at a future point in time (step S107). Specifically, when calculating the lifespan probability at a future point in time, for example 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. From 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 lifespan probability (p) corresponding to the acquired cumulative usage history after t days.

Next, the control unit 10 uses the daily usage history calculated in step S106 to calculate the number of days until a predetermined lifespan probability is reached (step S108). Specifically, when calculating the number of days until the lifespan probability reaches a predetermined 50%, for example, the control unit 10 calculates the cumulative usage history (Qx) when the lifespan probability is 50% by referring to the database fa, and calculates (cumulative usage history when the lifespan probability is 50% - cumulative usage history at the current time) / daily usage history. From this calculation, the control unit 10 calculates the number of days from the current time until the lifespan probability reaches 50%. If the time when the lifespan probability reaches 50% is defined as the lifespan 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 lifespan.

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 specified life probability is reached calculated in step S108 (step S109). The ECU may display the life probability and number of days notified by the control unit 10 on the instrument panel.

According to this embodiment, the degree of deterioration of the secondary battery 14 can be estimated by calculating the life probability according to the cumulative usage history of the secondary battery 14. In addition, according to this embodiment, the degree of deterioration of the secondary battery 14 in the future can be estimated by calculating the future life probability, and the number of days until the secondary battery 14 reaches the end of its life can be obtained.

[Modification]
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.

In the above-described embodiment, the database 10fa may be obtained from the outside through wired or wireless communication by the communication unit 10d and stored in the memory unit 10f. With this configuration, the database 10fa corresponding to the secondary battery 14 mounted on the vehicle is stored in the memory 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.

In the above-described embodiment, the charge history information and 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 SOC value range 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), rated capacity, SOC range, depth of discharge range, OCV range, or voltage range at the start of the engine 17 of the secondary battery 14, and a weighting value may be stored in the weighting table TB for each range of the SOC, depth of discharge range, OCV range, or voltage range at the start of the engine 17, and weighting may be performed by the SOC, depth of discharge, or voltage at the start of the engine 17.

In the above-described embodiment, the charge history information and the discharge history information are used when calculating the usage history Q, but it is also possible to use only one of the charge history information and the discharge history information. In addition, the integrated value of the charge time and the discharge 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. In addition, the 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 charge time, discharge time, and elapsed time are also examples of the time measured since the secondary battery 14 was attached.

In the above-described embodiment, the life probability is the percentage of the number of secondary batteries 14 that have become below a predetermined health level as a result of use among multiple secondary batteries 14 that have been previously evaluated for use, with the health level being defined as the value represented by the actual measured capacity/actual measured capacity when new. However, for example, the health level may be defined as the value represented by the actual measured capacity when new/actual measured capacity, with the number of secondary batteries 14 that have become above a predetermined health level as a result of use among multiple secondary batteries 14 that have been previously evaluated for use, or the percentage of the number of secondary batteries with the same usage history whose starting voltage is below a predetermined value. In addition, the life probability may be the percentage of the number of secondary batteries with the same usage history whose internal resistance is above a predetermined value, the percentage of the number of secondary batteries with the same usage history whose internal resistance is below a predetermined value, or the percentage of the number of secondary batteries with the same usage history whose internal resistance is below a predetermined value.

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 specified life probability is reached, but these calculations are not limited to being performed by 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 a 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 specified 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 the number of days to the ECU equipped in the vehicle, and the ECU may send the received life probability to the CPU 10a, and display the life probability and the number of days transmitted from the server device on the instrument panel. In this case, the CPU of the server device functions as a history information receiving means, a usage history calculation means, a life probability calculation means, and a life probability transmission 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 the number of days to a mobile terminal owned by the user of the vehicle, rather than to the ECU equipped in the vehicle, and the mobile terminal may display the transmitted life probability and the number of days. Additionally, the history data 10ca may be updated by transmitting the measured time, voltage, current, temperature, etc. to a server device, and updating the history data 10ca on the server device.

1 State detection device 10 Control unit 10a CPU
10b ROM
10ba program 10c RAM
10ca History data 10d Communication unit 10e Interface 10f Storage unit 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 (7)

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 state detection device according to claim 1, wherein the life probability indicates a proportion of the number of secondary batteries among a plurality of secondary batteries with the same usage history, the ratio of the actual capacity when new to the actual capacity being equal to or greater than a predetermined value; a proportion of the number of secondary batteries among a plurality of secondary batteries with the same usage history, the ratio of the actual capacity when new to the actual capacity being equal to or greater than a predetermined value; a proportion of the number of secondary batteries among a plurality of secondary batteries with the same usage history, the voltage at start-up of the engine mounted on the vehicle being equal to or less than a predetermined value; a proportion of the number of secondary batteries among a plurality of secondary batteries with the same usage history, the internal resistance value being equal to or greater than a predetermined value; a proportion of the number of secondary batteries among a plurality of secondary batteries with the same usage history, the ratio of the internal resistance value when new to the internal resistance value being equal to or less than a predetermined value; or a proportion of the number of secondary batteries among a plurality of secondary batteries with the same usage history, the ratio of the internal resistance value when new to the internal resistance value being equal to or greater than a predetermined value. The state detection device according to claim 1 or 2, wherein 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. 4. The state detection device according to claim 1, wherein the usage history is weighted by at least one of a temperature of the secondary battery, an SOC of the secondary battery, an SOH of the secondary battery, a rated capacity, a depth of discharge of the secondary battery, an OCV of the secondary battery, and a voltage of the secondary battery at the start of an engine mounted on the vehicle. The state detection device according to claim 1 , further comprising: a usage amount per unit period of the secondary battery 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 of time calculated based on the usage amount. 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: 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 the charging history information and/or the discharging history information received by the information receiving means, or from the charging history information and/or 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;
A condition detection system.

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