JP2022069435A - State detector, state detection method, and state detection system - Google Patents

Abstract

To determine deterioration and exhaustion of a secondary battery.SOLUTION: A state detector 1 is a state detector that detects a state of a secondary battery mounted on a vehicle. The state detector includes: measurement means for measuring a current and voltage of the secondary battery; open circuit voltage estimation means for estimating open circuit voltage of the secondary battery on the basis of the voltage measured by the measurement means; internal resistance calculation means for calculating an internal resistance value of the secondary battery on the basis of a measurement result of the measurement means; and determination means for determining deterioration of the secondary battery and exhaustion of the secondary battery using the internal resistance value and the open circuit voltage.SELECTED DRAWING: Figure 1

Description

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

As an invention for determining the state of a lead battery, for example, there is an invention disclosed in Patent Document 1-3. The life determination device disclosed in Patent Document 1 estimates the open circuit voltage and the internal resistance of the lead battery, and after the indentation charging is completed, if the open circuit voltage is smaller than the first threshold value, the lead battery is deteriorated. It is determined that the lead battery is deteriorated when the internal resistance is larger than the second threshold value before the start of normal charging. The battery state determination device disclosed in Patent Document 2 determines the state of the lead battery by comparing the internal resistance of the lead battery in a new fully charged state obtained in advance with the calculated internal resistance at the time of starting the engine. There is. The battery state determination device disclosed in Patent Document 3 calculates the engine starting voltage of a lead battery based on the open circuit voltage of the lead battery and the temperature of the vehicle, and when the increase rate of the internal resistance of the lead battery reaches a predetermined value. The lead battery determination voltage, which represents the voltage at the time of starting the engine, is calculated from the open circuit voltage, and the deterioration of the lead battery is determined by comparing the engine start voltage with the lead battery determination voltage.

International Publication No. 2014/155447 International Publication No. 2007/069595 International Publication No. 2007/105595

According to the invention of Patent Document 1-3, it is possible to determine the deterioration of the secondary battery by using the value of the internal resistance. However, since the value of the internal resistance also changes depending on the charge rate, it depends on the charge rate. May make a mistake in determining deterioration.

The present invention has been made in view of the above, and an object of the present invention is to provide a technique for discriminating deterioration and rise of a secondary battery.

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 the secondary battery mounted on the vehicle, and the current of the secondary battery and the state of the secondary battery are detected. The measuring means for measuring the voltage, the open circuit voltage estimating means for estimating the open circuit voltage of the secondary battery based on the voltage measured by the measuring means, and the secondary battery based on the measurement result of the measuring means. It is provided with an internal resistance calculating means for calculating the internal resistance value of the above, and a discriminating means for discriminating between the deterioration of the secondary battery and the rise of the secondary battery by using the internal resistance value and the open circuit voltage.

In the state detection device according to one aspect of the present invention, the internal resistance calculation means is determined by the current and voltage measured by the measuring means when the secondary battery supplies power to the load, or by the secondary battery. It is characterized in that the internal resistance value is calculated based on the current and voltage measured by the measuring means when discharged a plurality of times within a period.

When the state detection device according to one aspect of the present invention detects the deterioration of the secondary battery, it notifies the external device of the deterioration of the secondary battery, and when it detects the rise of the secondary battery, the secondary battery is described. It is characterized in that it notifies the external device of the exhaustion of the battery.

In the state detecting device according to one aspect of the present invention, the discriminating means discriminates between the deterioration of the secondary battery and the rise of the secondary battery based on at least one of the increase amount of the internal resistance value and the internal resistance value. It is characterized by doing.

In the state detection device according to one aspect of the present invention, the amount of increase is the difference between the predetermined reference value and the internal resistance value measured by the internal resistance calculation means, or the predetermined reference value and the internal. It is characterized by being a ratio to the internal resistance value measured by the resistance calculating means.

In the state detection device according to one aspect of the present invention, the reference value when detecting the deterioration of the secondary battery is the minimum value among the latest calculation of the internal resistance value and the past multiple calculations, and the past. The minimum value of the internal resistance values calculated in the above, the internal resistance value at the time of no deterioration, and the initial value of the internal resistance values calculated a plurality of times after the state of the secondary battery has changed. It is characterized by being one of the values.

In the state detection device according to one aspect of the present invention, the reference value at the time of detecting the rise of the secondary battery is the minimum value among the past multiple calculations from the latest calculation of the internal resistance value, and the past. The minimum value of the internal resistance values calculated in the above, the internal resistance value at the time of no deterioration, and the initial value of the internal resistance values calculated a plurality of times after the state of the secondary battery has changed. It is characterized by being one of the values.

In the state detection device according to one aspect of the present invention, when at least one of the increase amount and the internal resistance value calculated at a predetermined timing is equal to or higher than a predetermined threshold value, the secondary battery It is characterized in that it is estimated that the battery is rising or the secondary battery is nearing the rise.

The state detection device according to one aspect of the present invention is based on the increase amount of the internal resistance value or the internal resistance value calculated for each period in which the drive unit of the vehicle equipped with the secondary battery is in a standby state. It is characterized in that it is estimated that the secondary battery is dead or the secondary battery is almost dead.

In the state detecting device according to one aspect of the present invention, the internal resistance calculating means calculates the internal resistance value for each period in which the drive unit of the vehicle equipped with the secondary battery is in a standby state, and the discriminating means is a method. When the calculated increase amount of the internal resistance value or the internal resistance value is equal to or higher than a predetermined threshold, and the open circuit voltage or the voltage of the secondary battery is equal to or higher than a predetermined threshold, the secondary is obtained. It is characterized in that the battery is estimated to be deteriorated.

The state detection device according to one aspect of the present invention is characterized in that the deterioration of the secondary battery is estimated according to the ratio of the change in the internal resistance value to the change in the open circuit voltage.

The state detection device according to one aspect of the present invention is characterized in that the deterioration of the secondary battery is estimated based on the amount of change in the ratio.

In the state detection device according to one aspect of the present invention, the amount of change is the ratio of the change in the internal resistance value to the change in the open circuit voltage of the secondary battery or the voltage of the secondary battery when there is no deterioration, and the use. The difference between the open circuit voltage of the secondary battery after the start or the ratio of the change in the internal resistance value to the change in the voltage of the secondary battery, or the open circuit voltage of the secondary battery when there is no deterioration, or the second. The ratio of the change in the internal resistance value to the change in the voltage of the secondary battery to the open circuit voltage of the secondary battery or the change in the voltage of the secondary battery after the start of use to the ratio of the change in the internal resistance value to the change in the voltage of the secondary battery. It is characterized by being.

In the state detection device according to one aspect of the present invention, the measuring means measures the temperature of the secondary battery, and the internal resistance value calculated by the internal resistance calculating means is corrected by the temperature measured by the measuring means. A correction means is provided.

The state detection device according to one aspect of the present invention includes a notification means for notifying the state of the secondary battery inside the vehicle based on the determination result of the rise and deterioration.

The 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 is a measurement step for measuring the current and voltage of the secondary battery and the measurement step. An open circuit voltage estimation step that estimates the open circuit voltage of the secondary battery based on the voltage measured in the above step, and an internal resistance calculation step that calculates the internal resistance value of the secondary battery based on the measurement result of the measurement step. And a discrimination step for discriminating between the deterioration of the secondary battery and the rise of the secondary battery by using the internal resistance value and the open circuit voltage.

The state detection device according to the present invention is a state detection device that detects the state of the secondary battery mounted on the vehicle, and is based on the voltage measured by the measuring means for measuring the current and voltage of the secondary battery. An open circuit voltage estimating means for estimating the open circuit voltage of the secondary battery, an internal resistance calculating means for calculating the internal resistance value of the secondary battery based on the measurement result of the measuring means, the internal resistance value, and the said. A discriminating means for discriminating between the deterioration of the secondary battery and the rise of the secondary battery by using the open circuit voltage is provided.

The state detection method according to the present invention is a state detection method for detecting the state of a secondary battery mounted on a vehicle, and is based on a voltage measured by a measuring means for measuring the current and voltage of the secondary battery. An open circuit voltage estimation step for estimating the open circuit voltage of the secondary battery, an internal resistance calculation step for calculating the internal resistance value of the secondary battery based on the measurement result of the measuring means, the internal resistance value, and the said. The present invention includes a discrimination step of discriminating between deterioration of the secondary battery and rise of the secondary battery using an open circuit voltage.

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 that detects the state of a secondary battery mounted on a vehicle, and the state detection device is the above-mentioned state detection device. A measuring means for measuring the current and voltage of the secondary battery, a measurement result transmitting means for transmitting the measurement result of the measuring means to the server device, and an information receiving means for receiving the rising information and the deterioration information transmitted from the server device. The server device has the above, based on the measurement result receiving means for receiving the measurement result transmitted by the measurement result transmitting means and the voltage included in the measurement result received by the measurement result receiving means. An open circuit voltage estimating means for estimating the open circuit voltage of the secondary battery, an internal resistance calculating means for calculating the internal resistance value of the secondary battery based on the measurement result received by the measurement result receiving means, and the internal portion. Discriminating means for discriminating between the deterioration of the secondary battery and the rise of the secondary battery using the resistance value and the open circuit voltage, deterioration information indicating the determination result of the deterioration of the secondary battery by the discriminating means, and the above. The present invention includes an information transmitting means for transmitting the rising information representing the rising discrimination result of the secondary battery by the discriminating means to the state detecting device.

According to the present invention, it is possible to determine the deterioration and the rise of the secondary battery.

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 a configuration of a control unit included in the state detection device. FIG. 3 is a flowchart showing the flow of processing performed by the control unit. FIG. 4 is a graph showing the relationship between the open circuit voltage of the secondary battery and the internal resistance value. FIG. 5 is a flowchart showing the flow of processing performed by the control unit. FIG. 6 is a functional block diagram of the state detection device. FIG. 7 is a block diagram showing a configuration of a state detection system. FIG. 8 is a block diagram showing the configuration of the server device. FIG. 9 is a functional block diagram of the state detection system. FIG. 10 is a sequence diagram for explaining the operation of the state detection system. FIG. 11 is a functional block diagram of the state detection system of another embodiment. FIG. 12 is a sequence diagram for explaining the operation of the state detection system of another embodiment. FIG. 13 is a sequence diagram for explaining the operation of the state detection system of another embodiment. FIG. 14 is a block diagram showing a configuration of a state detection system according to another embodiment. FIG. 15 is a sequence diagram for explaining the operation of the state detection system of another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. Further, in the description of the drawings, the same or corresponding elements are appropriately designated by the same reference numerals.

[Embodiment]
(Structure of Embodiment)
FIG. 1 is a diagram showing a power supply system of a vehicle 2 having a state detection device according to an embodiment of the present invention. The state detection device 1 according to the embodiment includes 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 detects the state of the rechargeable secondary battery 14 mounted on the vehicle 2 based on the measurement results of the voltage sensor 11, the current sensor 12, and the temperature sensor 13. 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 may be partially or all of them collectively.

The engine 17 is composed of, for example, a gasoline engine, a reciprocating engine such as a diesel engine, a rotary engine, or the like. The engine 17 is started by a starter motor 18 and drives a drive wheel via a transmission to give propulsive force to the vehicle 2 and drive an alternator 16 to generate electric power.

The starter motor 18 is composed of, for example, a DC motor, and generates a rotational force by the electric 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 into DC power by a rectifying 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, a car navigation system, and the like, and is operated by electric power supplied from the secondary battery 14.

The secondary battery 14 is a rechargeable battery having an electrolytic solution, and is composed of, for example, a lead storage battery, a nickel cadmium battery, a nickel hydrogen battery, or the like. The secondary battery 14 is charged by the alternator 16 and drives the starter motor 18 to start the engine 17 and supply electric power to the load 19. The secondary battery 14 is configured by connecting a plurality of cells in series.

In the example of FIG. 1, the vehicle 2 is configured so that only the engine 17 outputs the driving force, but the vehicle 2 is driven by, for example, a hybrid vehicle or an electric motor equipped with an electric motor that assists the engine 17. It may be an electric vehicle such as an electric vehicle. In the case of an electric vehicle such as a hybrid vehicle or an electric vehicle, the secondary battery 14 activates a high-pressure system (a system for driving an electric motor) composed of a lithium battery or the like, and the high-pressure 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 electrolytic solution of the secondary battery 14 or the ambient temperature of 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 connected in series, a resistance element, or the like, and the secondary battery 14 is intermittently discharged (by turning on / off the semiconductor switch according to the control of the control unit 10). Pulse discharge).

The control unit 10 acquires signals from the voltage sensor 11, the current sensor 12, and the temperature sensor 13, and detects the state of the secondary battery 14 using the acquired signals. Further, the control unit 10 controls the charging state of the secondary battery 14 by controlling the generated voltage of the alternator 16. It should be noted that the control unit 10 does not control the charge state of the secondary battery 14 by controlling the generated voltage of the alternator 16, but for example, even if an ECU (Electric Control Unit) (not shown) controls the charge state. good.

FIG. 2 is a diagram showing a detailed configuration example of the control unit 10 shown in FIG. As shown in this figure, the control unit 10 includes 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. have. Instead of the CPU 10a, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or the like may be used.

The bus 10g is a signal line group for connecting the CPU 10a, the ROM 10b, the RAM 10c, the communication unit 10d, the interface 10e, and the storage unit 10f to each other, and enabling information exchange between them. The communication unit 10d communicates with a master ECU (Electronic Control Unit) or the like, which is a higher-level device, and uses information or control information indicating the state of the secondary battery 14 detected by the state detection device 1 as the higher-level device. Notice. The interface 10e converts and acquires the signals supplied from the voltage sensor 11, the current sensor 12, and the temperature sensor 13 into digital signals, and supplies the drive current to the discharge circuit 15, the alternator 16, the starter motor 18, and the like. To control these.

The ROM 10b is composed of a non-volatile semiconductor memory or the like, and stores the program 10ba or the like. The CPU 10a, which is an arithmetic processing means, controls each unit based on the program 10ba stored in the ROM 10b. Further, the CPU 10a executing the program 10ba detects the state of the secondary battery 14 by using the signal acquired by the interface 10e, the information stored in the RAM 10c, and the information stored in the storage unit 10f.

The RAM 10c is composed of a semiconductor memory or the like, and uses the data generated when the CPU 10a executes the program 10ba, the history of the measurement results of the voltage sensor 11, the current sensor 12, and the temperature sensor 13, and these measurement results. The history of various values calculated by the CPU 10a is stored. For example, the RAM 10c includes the voltage of the secondary battery 14 measured when the engine 17 is started, the internal resistance value of the secondary battery 14 calculated by the CPU 10a, and the open circuit voltage (OCV) of the secondary battery 14 calculated by the CPU 10a. ) Etc. are memorized.

FIG. 6 is a functional block diagram showing a configuration of a function realized by the control unit 10 by the CPU 10a executing the program 10ba. In the control unit 10 of the state detection device 1, the open circuit voltage estimation unit 101, the internal resistance calculation unit 102, and the discrimination unit 103 are realized. The open circuit voltage estimation unit 101 as the open circuit voltage estimation means estimates the open circuit voltage of the secondary battery 14 by a method described later. The internal resistance calculation unit 102 as the internal resistance calculation means calculates the internal resistance value of the secondary battery 14 from the measurement results of the voltage sensor 11 and the current sensor 12 by the method described later. The discrimination unit 103 discriminates between the deterioration of the secondary battery 14 and the rise of the secondary battery 14 by using the internal resistance value calculated by the internal resistance calculation unit 102 and the open circuit voltage estimated by the open circuit voltage estimation unit 101. The notification unit 106 causes the instrument panel 51 to display information indicating the state of the secondary battery 14 via the master ECU 40 and the meter ECU 50 based on the rising flag and the deterioration flag set by the discrimination unit 103. The master ECU 40 is an electronic control unit that controls the main control of the drive system of the vehicle 2, and the meter ECU 50 is a control unit that controls the instrument panel 51 that is an instrument panel. As shown in FIG. 6, the voltage sensor 11, the current sensor 12, and the temperature sensor 13 connected to the control unit 10 function as the measurement unit 20 as the measurement means. Although the state detection device 1 is configured to include the measuring unit 20 in FIG. 1, it may be configured to exclude the measuring unit 20. Further, the configuration may be such that the master ECU 40 is excluded.

The storage unit 10f is composed of a non-volatile memory, and stores, for example, a pre-measured initial value of the internal resistance value of the secondary battery 14 before the start of use.

The CPU 10a receives signals output from the voltage sensor 11, the current sensor 12, and the temperature sensor 13, and measures the voltage, current, and temperature, which are physical quantities of the secondary battery 14. For example, the CPU 10a obtains the voltage of the secondary battery 14 when the engine 17 is started from the detection result, and stores the history of the obtained voltage in the RAM 10c. Further, the CPU 10a uses the measured physical quantity of the secondary battery 14 to calculate the internal resistance value of the secondary battery 14 and estimate the open circuit voltage of the secondary battery 14, and the calculation result and the history of the estimation result are stored in the RAM 10c. To memorize. The voltage sensor 11, the current sensor 12, and the temperature sensor 13 are examples of measuring means. Further, the measurement of the physical quantity performed by the voltage sensor 11, the current sensor 12, and the temperature sensor 13 is an example of the measurement step.

For the internal resistance value of the secondary battery 14, for example, the control unit 10 controls the discharge circuit 15 to pulse discharge the secondary battery 14, and the voltage and current changes at that time are measured by the voltage sensor 11 and the current sensor 12. It is obtained by detecting and calculating the internal resistance from the detection result. Examples of the method for calculating the internal resistance value using the pulse discharge include the method disclosed in Japanese Patent No. 3960998 and the method disclosed in Japanese Patent No. 4494904, but the calculation is performed by another known method. You may. As the internal resistance value, an estimated value calculated from the values of the voltage and the current when the engine 17 is started may be used. Further, the open circuit voltage can be estimated by, for example, a method using an approximate expression disclosed in Japanese Patent No. 4785056. Further, the open circuit voltage is the latest voltage between terminals of the secondary battery 14 measured by the voltage sensor 11 when the engine 17 or the electric motor is started, or the latest voltage measured periodically by the voltage sensor 11 and stored in the RAM 10c. The voltage between the terminals of the secondary battery 14 may be estimated as the open circuit voltage. Further, the open circuit voltage is estimated based on the terminal voltage measured at the closest timing when the engine 17 or the electric motor is started, that is, the terminal voltage of the secondary battery 14 measured immediately before the engine 17 or the electric motor is started. You may.

(Operation example of the embodiment)
Next, an operation example of this embodiment will be described. FIG. 3 is a flowchart showing a flow of processing in which the control unit 10 estimates the state of the secondary battery 14. The control unit 10 executes the process shown in FIG. 3, for example, at a predetermined cycle or at a predetermined timing.

First, the control unit 10 determines whether the secondary battery 14 is in the standby state (step S101). Here, the control unit 10 determines that the engine 17 is in the standby state when the engine 17 is stopped (YES in step S101), and determines that the engine 17 is not in the standby state when the engine 17 is not stopped. (NO in step S101). Regarding the determination of whether the engine 17 is stopped, for example, the control unit 10 inquires of the master ECU 40 about the state of the engine 17 via the communication unit 10d, and when the master ECU 40 obtains a response of ignition off, the engine When it is determined that the engine 17 is in the stopped standby state and the process proceeds to step S102, and when a response to the ignition on is obtained from the master ECU 40, it is determined that the engine 17 is in the non-standby state and the step S110 is determined. Proceed to. When the control unit 10 receives a response to the ignition on from the master ECU 40, the control unit 10 may proceed to step S102 after a predetermined time has elapsed from the response. When the process proceeds to step S102 after the lapse of a predetermined time, the current, voltage, and temperature of the secondary battery 14 can be detected in a stable state of the secondary battery 14. When the vehicle 2 provided with the state detection device 1 is a hybrid vehicle, the state in which the engine 17 and the electric motor are not operating is set as a standby state, and when the vehicle 2 equipped with the state detection device 1 is an electric vehicle, the electric motor is used. The state in which is not operating may be set as the standby state. The engine 17 is an example of a drive unit that drives the vehicle 2, and the electric motor is also an example of the drive unit that drives the vehicle 2.

When the control unit 10 determines that the engine 17 is in the standby state, the control unit 10 acquires the initial value of the internal resistance value stored in the storage unit 10f (step S102). Next, the control unit 10 controls the discharge circuit 15 to pulse discharge the secondary battery 14, and detects changes in voltage and current when the secondary battery 14 is pulse discharged by the voltage sensor 11 and the current sensor 12, and from the detection results. The internal resistance value is calculated (step S103). Here, the CPU 10a functions as an internal resistance calculation means for calculating the internal resistance value. Further, step S103 is an example of the internal resistance calculation step. Further, the control unit 10 estimates the open circuit voltage after calculating the internal resistance value (step S104). Here, the CPU 10a functions as an open circuit voltage estimation means for estimating the open circuit voltage. Further, step S104 is an example of an open circuit voltage estimation step. After step S104, the control unit 10 determines whether the secondary battery 14 has risen or deteriorated by using the initial value of the internal resistance value, the calculated internal resistance value, and the estimated open circuit voltage. After step S105, the CPU 10a functions as a discriminating means for discriminating between the rise and deterioration of the secondary battery 14. Further, the processing of steps S105 to S108 is an example of a discrimination step for discriminating between the rise and deterioration of the secondary battery 14.

Here, an example of a method for discriminating between the rise and deterioration of the secondary battery 14 will be described. FIG. 4 is a graph showing the relationship between the open circuit voltage and the internal resistance value in the secondary battery 14 in which charging and discharging are repeated. When the value expressed by the measured capacity / the measured capacity at the time of new product is taken as the health condition, the solid line graph is a graph in which the secondary battery 14 is new and the health condition is 1, and the broken line graph is 2. It is a graph of a state in which the secondary battery 14 is used and the measured capacity is lowered and the health degree is lowered, and the graph of the alternate long and short dash line is a state in which the measured capacity is further lowered and the health degree is close to 0. It is a graph of.

As shown in FIG. 4, in the secondary battery 14, the internal resistance value depends on the open circuit voltage. Further, as shown in FIG. 4, when the health degree of the secondary battery 14 is different, the lower the health degree, the higher the internal resistance value of the secondary battery 14 at the higher open circuit voltage. The open circuit voltage correlates with the charge rate (SOC), and the charge rate decreases as the open circuit voltage decreases. In other words, when the amount of increase in the internal resistance value exceeds the threshold value, the charge rate is low. It is a state, and the rise of the secondary battery 14 can be detected by determining whether the rise amount of the internal resistance value exceeds the threshold value. Further, according to the graph of FIG. 4, when the amount of increase in the internal resistance value of the secondary battery 14 exceeds the threshold value, the open circuit voltage increases as the health level decreases, and the amount of increase in the internal resistance value increases. By determining whether the open circuit voltage exceeds the threshold value in the state where the threshold value is exceeded, it is possible to detect a state in which the health level is low, that is, a state in which the secondary battery 14 is deteriorated.

Returning to FIG. 3, the control unit 10 determines whether the amount of increase in the internal resistance value exceeds a predetermined first threshold value and the open circuit voltage exceeds a predetermined deterioration threshold value (step S105). .. Specifically, the control unit 10 uses, for example, the difference between the internal resistance value acquired in step S102 and the internal resistance value calculated in step S103 as the internal resistance value increase amount, and the internal resistance value increase amount is predetermined. 1 Determine if the threshold is exceeded. When the amount of increase in the internal resistance value exceeds a predetermined first threshold value, the control unit 10 determines whether the open circuit voltage estimated in step S104 exceeds the predetermined deterioration threshold value. When the secondary battery 14 deteriorates, the internal resistance value becomes higher than the internal resistance value measured when not in use. Further, as shown in FIG. 4, even if the amount of increase in the internal resistance value is the same, the open circuit voltage increases as the health level decreases, that is, as the deterioration progresses. Therefore, it is possible to detect that the secondary battery 14 is in a deteriorated state by determining whether the amount of increase in the internal resistance value exceeds the first threshold value and the open circuit voltage exceeds the deterioration threshold value. The first threshold value is determined by evaluating in advance by an experiment in consideration of the startability of the engine 17.

When the amount of increase in the internal resistance value does not exceed the first threshold value or the open circuit voltage does not exceed the deterioration threshold value (NO in step S105), the control unit 10 proceeds to step S107 and proceeds to the internal resistance value. If the amount of increase in the battery exceeds the first threshold value and the open circuit voltage exceeds a predetermined deterioration threshold value (YES in step S105), it is estimated that the secondary battery 14 is in a deteriorated state. , The deterioration flag indicating that the secondary battery 14 is in a deteriorated state is turned ON (step S106). That is, the state in which the amount of increase in the internal resistance value exceeds the first threshold value and the open circuit voltage exceeds the predetermined deterioration threshold value is the state in which the secondary battery 14 is deteriorated. If the control unit 10 determines NO in step S105, the control unit 10 may turn off the deterioration flag before proceeding to step S107.

Next, the control unit 10 determines whether the amount of increase in the internal resistance value used in step S105 exceeds a predetermined second threshold value (step S107). The control unit 10 proceeds to step S109 when the internal resistance value increase amount does not exceed the second threshold value (NO in step S107), and proceeds to step S109 when the internal resistance value increase amount exceeds the second threshold value (NO). YES in step S107), it is estimated that the secondary battery 14 is in a raised state, and the rising flag indicating that the secondary battery 14 is in a raised state is turned on (step S108). That is, the state in which the amount of increase in the internal resistance value exceeds the second threshold value is the state in which the secondary battery 14 is increased. If YES in step S107, the control unit 10 may presume that the secondary battery is about to run out. In this case, the state in which the amount of increase in the internal resistance value exceeds the second threshold value and the rising flag is ON means that the secondary battery is near rising. The first threshold value, the second threshold value, and the deterioration threshold value are set to appropriate values by evaluating the secondary battery 14.

The control unit 10 sends the rising flag and the deterioration flag in step S109 to the master ECU 40 in the communication unit 10d, and notifies the master ECU 40 of the state of the secondary battery 14 (step S109). The master ECU 40 that has acquired the rising flag and the deterioration flag, for example, when the rising flag is ON, provides information indicating that the secondary battery 14 is rising or information prompting the replacement of the secondary battery 14 on the instrument panel. When the deterioration flag is ON, information indicating that the secondary battery 14 has deteriorated and needs to be replaced is displayed on the instrument panel. The notification prompting the replacement of the secondary battery 14 and the notification notifying that the secondary battery 14 is up are not limited to the display on the instrument panel, and may be, for example, an alarm sound or a voice. good. Further, these notifications may be performed at the timing when the accessory power supply is turned on in the vehicle 2 or at the timing when the ignition is turned on.

When the control unit 10 determines in step S101 that it is not in the standby state, it determines whether the secondary battery 14 has been replaced (step S110). Here, when the control unit 10 communicates with the master ECU 40, for example, in the communication unit 10d and obtains information from the master ECU 40 indicating that the replacement has not been performed, the secondary battery 14 has not been replaced. (NO in step S110), and the process proceeds to step S109. Further, when the control unit 10 communicates with the master ECU 40 in the communication unit 10d and acquires information indicating that the replacement has been performed from the master ECU 40, it is determined that the secondary battery 14 has been replaced ( YES in step S110), the deterioration flag is turned off (step S111), the rising flag is turned off (step S112), and the process proceeds to step S109. When the process of step S111 and step S112 is performed and then YES is determined in step S101 to proceed to step S102, the deterioration flag and the rising flag are initialized when the secondary battery 14 is replaced. The rising flag and the deterioration flag are in the OFF state. Further, the control unit 10 determines whether or not the secondary battery 14 has been replaced even in the standby state, and if it is determined that the secondary battery 14 has been replaced, the deterioration flag and the rising flag are turned off even in the standby state. May be.

As described above, according to the present embodiment, it is possible to discriminate between a state in which the secondary battery 14 is raised and a state in which the secondary battery 14 is deteriorated, and it is erroneously estimated that the state of the secondary battery 14 is deteriorated in the state where the charge rate is lowered. You can prevent it from happening.

In the flowchart shown in FIG. 3, the processes of steps S113 to S115 may be added between steps S108 and S109 as shown in FIG. When executing the processing of the flowchart shown in FIG. 5, the control unit 10 determines whether the deterioration flag is OFF and the rising flag is ON after determining No after step S108, after step S112, or in step S110. (Step S113). When the deterioration flag is OFF and the rising flag is ON (Yes in step S113), the control unit 10 determines whether the amount of increase in the internal resistance value is less than the third threshold value (step S114). When the amount of increase in the internal resistance value is less than the third threshold value (Yes in step S114), the control unit 10 turns off the increase flag (step S115). The control unit 10 executes the process of step S115 when the deterioration flag is OFF and the rising flag is not ON (No in step S113) or when the amount of increase in the internal resistance value is not less than the third threshold value (No in step S114). Instead, the process flow is moved to step S109.

Further, when the control unit 10 executes the process of calculating the internal resistance value in step S103, the control unit 10 executes a set of the process of calculating the pulse discharge and the internal resistance value a plurality of times, and averages the internal resistance values calculated in each set. The value may be an internal resistance value.

Further, the control unit 10 repeats the processes of steps S103 to S105 a plurality of times, shifts the process flow to the step S106 when the determination result of the step S105 is Yes a plurality of times in succession, and has a plurality of determination results of the step S105. If it is not Yes in succession, the process flow may be transferred to step S107.

Further, also in step S107, when the amount of increase in the internal resistance value calculated consecutively a plurality of times exceeds the second threshold value a plurality of times in a row, the processing flow is transferred to the step S108, and the calculation is performed a plurality of times in a row. If the amount of increase in the internal resistance value does not exceed the second threshold value a plurality of times in succession, the processing flow may be transferred to step S109.

(Modification example)
Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be implemented in various other embodiments. For example, the present invention may be carried out by modifying the above-described embodiment as follows. The above-described embodiment and the following modifications may be combined. The present invention also includes a configuration in which the components of each of the above-described embodiments and modifications are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment or modification, and various modifications can be made.

In the above-described embodiment, for example, the internal resistance value is calculated from the physical quantities detected by various sensors when the engine 17 in the non-standby state is started, and the amount of increase in the internal resistance value up to the calculated internal resistance value is predetermined. If the specified threshold value is exceeded, it is estimated that the secondary battery 14 is up, and the rise flag may be turned ON to notify the master ECU 40. In the non-standby state, the internal resistance value is calculated from the physical quantities detected by various sensors in a predetermined cycle, and the amount of increase in the internal resistance value up to the calculated internal resistance value exceeds the predetermined threshold value. In this case, it may be presumed that the secondary battery 14 is dead, the rise flag may be turned ON, and the master ECU 40 may be notified.

In the above-described embodiment, the control unit 10 estimates the deterioration of the secondary battery by comparing the increase amount of the internal resistance value with the first threshold value in step S105, but calculates the internal resistance value with respect to the initial value. Deterioration of the secondary battery may be estimated using the ratio of the internal resistance values. In this case, if the ratio exceeds a predetermined threshold value and the open circuit voltage exceeds the deterioration threshold value, the control unit 10 proceeds to step S106. Further, also in step S107, the rise of the secondary battery may be estimated by using the ratio of the calculated internal resistance value to the initial value of the internal resistance value. In this case, if the ratio exceeds a predetermined threshold value, the control unit 10 proceeds to step S108.

In the above-described embodiment, the initial value of the internal resistance value is the internal resistance value of the secondary battery 14 measured in advance before the start of use, but the initial value of the internal resistance value is limited to this value. is not. For example, the initial value of the internal resistance value transitions from the ignition on to the standby state, and the voltage and current changes are detected a plurality of times by the voltage sensor 11 and the current sensor 12 in the standby state, and the internal resistance value is calculated for each detection. , The initial value calculated for each standby state may be used as the initial value of the internal resistance value. Further, the control unit 10 stores the calculated internal resistance value as a history, and the minimum value among the values between the latest value and the past multiple times may be used as the initial value of the internal resistance value, and is stored as a history. The minimum value may be the initial value of the internal resistance value.

In the above-described embodiment, the master ECU 40 notifies the control unit 10 that the ignition has been turned off, and the control unit 10 executes the process of FIG. 3 each time the ignition off notification is received from the master ECU 40. May be good. According to this modification, the rise and deterioration of the secondary battery 14 are detected every time the standby state is reached.

In the above-described embodiment, the control unit 10 compares the open circuit voltage estimated in step S104 with the deterioration threshold in step S105, but the voltage when the engine 17 is started instead of the open circuit voltage. Alternatively, the deterioration of the secondary battery 14 may be estimated by comparing the voltage of the secondary battery 14 detected by the voltage sensor 11 during standby with the deterioration threshold.

In the above-described embodiment, the second threshold value may be a value corresponding to the voltage when the engine 17 is started or the voltage of the secondary battery 14 detected by the voltage sensor 11 during standby. In this case, the value of the second threshold value is set lower as the voltage increases.

In the present invention, a function representing the relationship between the decrease in the open circuit voltage and the increase in the internal resistance value is calculated for each standby period, and the deterioration of the secondary battery 14 can be estimated using the slope of the calculated function. good. For example, as shown in FIG. 4, as the deterioration of the secondary battery 14 progresses and the health level decreases, the change in the internal resistance value becomes larger with respect to the change in the open circuit voltage, and the slope of the graph, that is, The ratio of the change in the internal resistance value to the change in the open circuit voltage increases. The control unit 10 may calculate this inclination, and if the calculated inclination exceeds a predetermined threshold value, may determine YES in step S105.

When calculating the slope of the graph, the control unit 10 determines that, for example, when the amount of change from the slope when the secondary battery 14 is new to the latest calculated slope exceeds a predetermined threshold value. It may be determined as YES in step S105. Further, the control unit 10 may determine YES in step S105 when the ratio of the latest calculated inclination to the inclination when the secondary battery 14 is new exceeds a predetermined threshold value.

In the above-described embodiment, the state detection device 1 included in the vehicle 2 estimates the rise and deterioration of the secondary battery 14, but the device for performing this estimation is not limited to the state detection device 1. .. For example, the state detection device 1 determines the initial value of the internal resistance value, the voltage and the current when the secondary battery 14 is pulse-discharged, via the master ECU 40 provided in the vehicle 2, the communication interface, and the mobile communication network. The measurement result is transmitted to the server device that provides the cloud service. The server device is not limited to the one that provides the cloud service, and may be a well-known server device that provides information in response to a request from the client. In this case, the CPU 10a, the communication unit 10d, and the master ECU 40 function as measurement result transmission means. The server device receives the initial value of the internal resistance value transmitted from the master ECU 40 and the measurement results of the voltage and the current through the communication interface. This server device performs the processing of steps S103 and S104 using the received initial value of the internal resistance value and the measurement results of voltage and current, and steps from step S105 using the result of step S103 and the result of step S104. The processing up to S108 is executed. Here, the server device stores each of the above-mentioned threshold values in advance. After performing the processing of step S108 from step S105, the server device transmits the rising flag and the deterioration flag to the master ECU 40 via the communication interface, and the master ECU 40 sends the deterioration flag and the rising flag to the CPU 10a, and the rising flag and the deterioration flag are transmitted to the CPU 10a. Information according to the content is displayed on the instrument panel. In this case, the CPU of the server device functions as a measurement result receiving means, an open circuit voltage estimating means, an internal resistance calculating means, a discriminating means, and an information transmitting means, and the CPU 10a, the communication unit 10d, and the master ECU 40 are information receiving means. Is functioning as. Further, in this case, the rising flag is an example of rising information, and the deterioration flag is an example of deterioration information. The state detection device 1 and the server device are examples of the state detection system. Further, the server device transmits the deterioration flag and the rising flag to the mobile terminal owned by the notification target person (here, the user of the vehicle 2, but generally the owner, the user, the service provider, etc. of the vehicle). However, the mobile terminal may display information corresponding to the content of each flag to the user. In the server device, the relationship between the internal resistance value and the open circuit voltage may be learned based on the information sent from the plurality of state detection devices 1 and the above-mentioned threshold values may be set.

[Embodiment of state detection system]
FIG. 7 is a block diagram showing the configuration of the state detection system 1000 according to the present invention. The server device 3 has a function of providing information to a notification target person (for example, a user of the vehicle 2). The mobile terminal 4 is, for example, a smartphone owned by the user of the vehicle 2.

The vehicle 2 includes a control unit 10, a measurement unit 20, a master ECU 40, a communication ECU 30, a meter ECU 50, and an instrument panel 51. The control unit 10 is the control unit 10 of the state detection device 1 according to the above-described embodiment. In the state detection system 1000, the state detection device 1 is composed of only the control unit 10 excluding the voltage sensor 11, the current sensor 12, and the temperature sensor 13. The communication ECU 30 is, for example, a communication unit that communicates with the server device 3 via a communication interface for wireless communication. The master ECU 40 is an electronic control unit that controls the main control of the drive system of the vehicle 2. The meter ECU 50 is a control unit that controls the instrument panel 51, which is an instrument panel.

FIG. 8 is a block diagram showing a detailed configuration of the server device 3. As shown in this figure, the server device 3 has a CPU 30a, a ROM 30b, a RAM 30c, a communication unit 30d, a storage unit 30f, and a bus 30g. Instead of the CPU 30a, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or the like may be used.

The bus 30g is a signal line group for connecting the CPU 30a, the ROM 30b, the RAM 30c, the communication unit 30d, the interface 30e, and the storage unit 30f to each other, and enabling information exchange between them. The communication unit 30d communicates with the state detection device 1 via the communication network and exchanges information.

The ROM 30b is composed of a non-volatile semiconductor memory or the like, and stores the program 30ba or the like. The CPU 30a, which is a calculation means, controls each unit based on the program 30ba stored in the ROM 30b.

The RAM 30c is composed of a semiconductor memory or the like, and stores data generated when the CPU 30a executes the program 30ba and information transmitted from the state detection device 1.

FIG. 9 is a functional block diagram showing a configuration of functions realized by the control unit 10 and the server device 3 related to the state detection system 1000.

In the control unit 10, an open circuit voltage estimation unit 101, an internal resistance calculation unit 102, a discrimination unit 103, and a first information transmission unit 104 are realized. The first information transmission unit 104 as the first information transmission means transmits the rising flag and the deterioration flag to the server device 3.

In the server device 3, the second information receiving unit 301, the second information transmitting unit 302, and the setting unit 306 are realized by the CPU 30a executing the program 30ba. The second information receiving unit 301 receives the information transmitted from the control unit 10. The second information transmission unit 302 transmits information indicating the state of the secondary battery 14 to the control unit 10 and the mobile terminal 4. The setting unit 306 sets whether or not to transmit the information indicating the state of the secondary battery 14 to the mobile terminal 4 based on the instruction from the mobile terminal 4 or the instruction from the operator of the server device 3.

FIG. 10 is a sequence diagram for explaining the operation of the state detection system 1000. The first information transmission unit 104 of the control unit 10 sends the rising flag and the deterioration flag to the master ECU 40 (step S1). The master ECU 40 sends the rising flag and the deterioration flag to the communication ECU 30 (step S2), and the communication ECU 30 sends the rising flag and the deterioration flag to the server device 3 (step S3).

The second information receiving unit 301 of the server device 3 receives the rising flag and the deterioration flag transmitted from the communication ECU 30.
The second information transmission unit 302 transmits the rising flag and the deterioration flag to the mobile terminal 4 of the user of the vehicle 2 (step S4).

When the transmitted rising flag is ON, the mobile terminal 4 displays information indicating that the secondary battery 14 is running or information prompting the replacement of the secondary battery 14, and the deterioration flag is ON. In some cases, information indicating that the secondary battery 14 has deteriorated and needs to be replaced is displayed.

Further, the master ECU 40 sends the rising flag and the deterioration flag sent from the control unit 10 to the meter ECU 50 (step S5).
When the rising flag sent from the master ECU 40 is ON, the meter ECU 50 displays information indicating that the secondary battery 14 is rising or information prompting the replacement of the secondary battery 14 on the instrument panel 51. When the deterioration flag is ON, the instrument panel 51 displays information indicating that the secondary battery 14 has deteriorated and needs to be replaced.

The control unit 10 sends the rising flag and the deterioration flag directly to the meter ECU 50, and the meter ECU 50 displays information on the instrument panel 51 according to the rising flag and the deterioration flag sent directly from the control unit 10. May be good.

FIG. 11 is a functional block diagram showing a configuration of functions realized in the control unit 10 and the server device 3 of the state detection system 1000 according to another embodiment.

In the control unit 10, the first information transmission unit 104 and the first information reception unit 105 are realized. The first information transmission unit 104 transmits the initial value of the internal resistance value and the measurement result of the voltage and current measurement unit 20 when the secondary battery 14 is pulse-discharged to the server device 3. The first information receiving unit 105 as the first information receiving means receives the information transmitted from the server device 3.

In the server device 3, the CPU 30a executes the program 30ba to realize the second information receiving unit 301, the second information transmitting unit 302, the open circuit voltage estimation unit 303, the internal resistance calculation unit 304, and the discrimination unit 305. ..

The open circuit voltage estimation unit 303 estimates the open circuit voltage of the secondary battery 14 based on the information received by the second information receiving unit 301. The internal resistance calculation unit 304 calculates the internal resistance value of the secondary battery 14 based on the voltage and current information received by the second information receiving unit 301. The discrimination unit 305 discriminates the deterioration and rise of the secondary battery 14 by using the internal resistance value calculated by the internal resistance calculation unit 304 and the open circuit voltage estimated by the open circuit voltage estimation unit 303. The second information transmitting unit 302 controls a deterioration flag as deterioration information indicating the deterioration discrimination result of the secondary battery 14 by the discrimination unit 305 and a rising flag as rising information indicating the rising discrimination result of the secondary battery 14. It is transmitted to the unit 10 and the mobile terminal 4.

FIG. 12 is a sequence diagram for explaining the operation of the state detection system 1000 having the configuration shown in FIG. The first information transmission unit 104 of the control unit 10 sends the initial value of the internal resistance value and the measurement results of the voltage and the current when the secondary battery 14 is pulse-discharged to the master ECU 40 (step S11). The master ECU 40 sends the initial value of the internal resistance value and the measurement result to the communication ECU 30 (step S12), and the communication ECU 30 transmits the initial value of the internal resistance value and the measurement result to the server device 3 (step S13).

The second information receiving unit 301 of the server device 3 receives the initial value of the internal resistance value transmitted from the communication ECU 30 and the measurement results of the voltage and the current. The open circuit voltage estimation unit 303 of the server device 3 estimates the open circuit voltage of the secondary battery 14 based on the measurement result received by the second information receiving unit 301. The internal resistance calculation unit 304 of the server device 3 calculates the internal resistance value of the secondary battery 14 based on the voltage and current information received by the second information receiving unit 301. The determination unit 305 executes the processes from step S105 to step S108 using the calculated internal resistance value and the estimated open circuit voltage. The second information transmission unit 302 transmits the rising flag and the deterioration flag to the mobile terminal 4 of the user of the vehicle 2 (step S14).

When the transmitted rising flag is ON, the mobile terminal 4 displays information indicating that the secondary battery 14 is running or information prompting the replacement of the secondary battery 14, and the deterioration flag is ON. In some cases, information indicating that the secondary battery 14 has deteriorated and needs to be replaced is displayed.

Further, the second information transmission unit 302 of the server device 3 transmits the rising flag and the deterioration flag to the vehicle 2 (step S15). The communication ECU 30 sends the rising flag and the deterioration flag transmitted from the server device 3 to the master ECU 40 (step S16). The master ECU 40 sends the rising flag and the deterioration flag sent from the communication ECU 30 to the control unit 10 (step S17).

The first information receiving unit 105 of the control unit 10 acquires the rising flag and the deterioration flag sent from the master ECU 40. The first information transmission unit 104 of the control unit 10 sends the acquired rising flag and deterioration flag to the master ECU 40 (step S18). The master ECU 40 sends the rising flag and the deterioration flag sent from the control unit 10 to the meter ECU 50 (step S19). When the rising flag sent from the master ECU 40 is ON, the meter ECU 50 displays information indicating that the secondary battery 14 is rising or information prompting the replacement of the secondary battery 14 on the instrument panel 51. When the deterioration flag is ON, the instrument panel 51 displays information indicating that the secondary battery 14 has deteriorated and needs to be replaced.

The control unit 10 sends the rising flag and the deterioration flag directly to the meter ECU 50, and the meter ECU 50 displays information on the instrument panel 51 according to the rising flag and the deterioration flag sent directly from the control unit 10. May be good. Further, the master ECU 40 directly sends the rising flag and the deterioration flag acquired in step S16 to the meter ECU 50, and the meter ECU 50 displays information on the instrument panel 51 according to the rising flag and the deterioration flag directly sent from the master ECU 40. You may do so.

FIG. 13 is a sequence diagram for explaining another operation of the state detection system 1000 according to another embodiment. The first information transmission unit 104 of the control unit 10 sends the initial value of the internal resistance value and the measurement results of the voltage and current when the secondary battery 14 is pulse-discharged to the communication ECU 30 (step S21), and the communication ECU 30 sends the measurement results to the communication ECU 30. The initial value of the internal resistance value and the measurement result are transmitted to the server device 3 (step S22).

The second information receiving unit 301 of the server device 3 receives the initial value of the internal resistance value transmitted from the communication ECU 30 and the measurement results of the voltage and the current. The open circuit voltage estimation unit 303 of the server device 3 estimates the open circuit voltage of the secondary battery 14 based on the measurement result received by the second information receiving unit 301. The internal resistance calculation unit 304 of the server device 3 calculates the internal resistance value of the secondary battery 14 based on the voltage and current information received by the second information receiving unit 301. The discrimination unit 305 executes the processes from step S105 to step S108 using the calculated internal resistance value and the estimated open circuit voltage. The second information transmission unit 302 transmits the rising flag and the deterioration flag to the mobile terminal 4 of the user of the vehicle 2 (step S23).

When the transmitted rising flag is ON, the mobile terminal 4 displays information indicating that the secondary battery 14 is running or information prompting the replacement of the secondary battery 14, and the deterioration flag is ON. In some cases, information indicating that the secondary battery 14 has deteriorated and needs to be replaced is displayed.

Further, the second information transmission unit 302 of the server device 3 transmits the rising flag and the deterioration flag to the vehicle 2 (step S24). The communication ECU 30 sends the rising flag and the deterioration flag transmitted from the server device 3 to the control unit 10 (step S25). The first information receiving unit 105 of the control unit 10 acquires the rising flag and the deterioration flag sent from the communication ECU 30.

The first information transmission unit 104 of the control unit 10 sends the acquired rising flag and deterioration flag to the master ECU 40 (step S26). The master ECU 40 sends the rising flag and the deterioration flag sent from the control unit 10 to the meter ECU 50 (step S27). When the rising flag sent from the master ECU 40 is ON, the meter ECU 50 displays information indicating that the secondary battery 14 is rising or information prompting the replacement of the secondary battery 14 on the instrument panel 51. When the deterioration flag is ON, the instrument panel 51 displays information indicating that the secondary battery 14 has deteriorated and needs to be replaced.

The control unit 10 directly sends the rising flag and the deterioration flag acquired in step S25 to the meter ECU 50, and the meter ECU 50 transmits information on the instrument panel 51 according to the rising flag and the deterioration flag directly sent from the control unit 10. It may be displayed.

Further, the communication ECU 30 sends the rising flag and the deterioration flag acquired in step S24 to the master ECU 40, the master ECU 40 sends the rising flag and the deterioration flag sent from the communication ECU 30 to the meter ECU 50, and the meter ECU 50 sends the rising flag and the deterioration flag from the master ECU 40. Information may be displayed on the instrument panel 51 according to the sent rising flag and deterioration flag.

Further, the communication ECU 30 directly sends the rising flag and the deterioration flag acquired in step S24 to the meter ECU 50, and the meter ECU 50 displays information on the instrument panel 51 according to the rising flag and the deterioration flag directly sent from the communication ECU 30. You may do so.

Further, the control unit 10 may have an integrated configuration including the communication ECU 30 as shown in FIG. FIG. 15 is a sequence diagram for explaining the operation of the state detection system 1000 according to the embodiment in which the control unit 10 and the communication ECU 30 are integrated. In this case, the first information transmission unit 104 of the control unit 10 transmits the initial value of the internal resistance value and the measurement results of the voltage and current when the secondary battery 14 is pulse-discharged to the server device 3 by the communication ECU 30 (the communication ECU 30). Step S31).

The second information receiving unit 301 of the server device 3 receives the initial value of the internal resistance value transmitted from the communication ECU 30 and the measurement results of the voltage and the current. The open circuit voltage estimation unit 303 of the server device 3 estimates the open circuit voltage of the secondary battery 14 based on the measurement result received by the second information receiving unit 301. The internal resistance calculation unit 304 of the server device 3 calculates the internal resistance value of the secondary battery 14 based on the voltage and current information received by the second information receiving unit 301. The discrimination unit 305 executes the processes from step S105 to step S108 using the calculated internal resistance value and the estimated open circuit voltage. The second information transmission unit 302 transmits the rising flag and the deterioration flag to the mobile terminal 4 of the user of the vehicle 2 (step S32).

When the transmitted rising flag is ON, the mobile terminal 4 displays information indicating that the secondary battery 14 is running or information prompting the replacement of the secondary battery 14, and the deterioration flag is ON. In some cases, information indicating that the secondary battery 14 has deteriorated and needs to be replaced is displayed.

Further, the second information transmission unit 302 of the server device 3 transmits the rising flag and the deterioration flag to the vehicle 2 (step S33). The communication ECU 30 acquires the rising flag and the deterioration flag transmitted from the server device 3.

The first information transmission unit 104 of the control unit 10 sends the rising flag and the deterioration flag acquired by the communication ECU 30 to the master ECU 40 (step S34). The master ECU 40 sends the rising flag and the deterioration flag sent from the control unit 10 to the meter ECU 50 (step S35). When the rising flag sent from the master ECU 40 is ON, the meter ECU 50 displays information indicating that the secondary battery 14 is rising or information prompting the replacement of the secondary battery 14 on the instrument panel 51. When the deterioration flag is ON, the instrument panel 51 displays information indicating that the secondary battery 14 has deteriorated and needs to be replaced.

In the state detection system 1000, it may be possible to set whether or not to transmit the rising flag and the deterioration flag to the mobile terminal 4. For example, when the operator operates the server device 3, it is set whether or not to transmit the rising flag and the deterioration flag to the mobile terminal 4 for each mobile terminal 4, and the rising flag and the deterioration flag are transmitted according to the setting. May be controlled. Further, the server device 3 sets whether or not to transmit the rising flag and the deterioration flag to the mobile terminal 4 for each mobile terminal 4 in response to the instruction from the mobile terminal 4, and sets the rising flag according to the setting. You may control the transmission of the degradation flag. Further, it may be possible to set whether or not to transmit the rising flag and the deterioration flag to the mobile terminal 4 by the operation in the vehicle 2, and the server device 3 may control the transmission of the rising flag and the deterioration flag according to the setting.

In the state detection system 1000, when the mobile terminal 4 performs notification based on the rising flag or the deterioration flag, the notification method may be set. For example, it may be possible to switch between a method of notifying information based on the deterioration flag and the rising flag by characters and a method of notifying by icons.

In the state detection system 1000, the configuration related to communication between the state detection device 1 and the server device 3 may be such that electric power is constantly supplied, and communication may be possible even when the engine is not driven. .. For example, when the state detection device 1 communicates with the server device 3 via the master ECU 40 and the communication ECU 30, the state detection device 1, the master ECU 40, and the communication ECU 30 may be in a state where electric power is constantly supplied. In this configuration, the master ECU 40 and the communication ECU 30 are put into a standby state in the key-off state of the vehicle 2, the initial value of the internal resistance value from the state detection device 1, the voltage when the secondary battery 14 is pulse-discharged, and the voltage when the secondary battery 14 is pulse-discharged. When the current measurement result is sent to the master ECU 40, the master ECU 40 and the communication ECU 30 may be restored. Further, for example, when the state detection device 1 communicates with the server device 3 via the communication ECU 30 without going through the master ECU 40, the state detection device 1 and the communication ECU 30 may be in a state of being constantly supplied with electric power. Further, the meter ECU 50 and the instrument panel 51 are also configured so that power is supplied when the vehicle 2 is in the key-off state, and the state of the secondary battery 14 is set even when the vehicle 2 is in the key-off state based on the rising flag and the deterioration flag. The instrument panel 51 may be used for constant notification.

In the state detection system 1000, the master ECU 40 may be configured to discriminate between the rise and deterioration of the secondary battery 14 as in the server device 3. In this configuration, the master ECU 40 may transmit the rising flag and the deterioration flag to the server device 3, and the server device 3 may transmit the transmitted rising flag and the deterioration flag to the mobile terminal 4. Further, the master ECU 40 may send the rising flag and the deterioration flag to the control unit 10, and the control unit 10 may send the rising flag and the deterioration flag to the meter ECU 50. Further, the rising flag and the deterioration flag may be sent from the master ECU 40 to the meter ECU 50.

In the state detection system 1000, the open circuit voltage of the secondary battery 14 estimated by the open circuit voltage estimation unit 303 and the internal resistance value of the secondary battery 14 calculated by the internal resistance calculation unit 304 are set by the second information transmission unit 302. It is transmitted to the control unit 10, and the control unit 10 may determine whether the secondary battery 14 has deteriorated or rises by using the open circuit voltage and the internal resistance value transmitted from the server device 3.

Further, in the state detection system 1000, the open circuit voltage of the secondary battery 14 estimated by the open circuit voltage estimation unit 303 is transmitted to the control unit 10 by the second information transmission unit 302, and the control unit 10 is transmitted from the server device 3. The discriminating unit 103 may discriminate between the rise and deterioration of the secondary battery 14 by using the transmitted open circuit voltage and the internal resistance value calculated by the internal resistance calculation unit 102.

Further, in the state detection system 1000, the internal resistance value of the secondary battery 14 calculated by the internal resistance calculation unit 304 is transmitted to the control unit 10 by the second information transmission unit 302, and the control unit 10 transmits from the server device 3. The discriminant unit 103 may discriminate between the rise and deterioration of the secondary battery 14 by using the internal resistance value obtained and the open circuit voltage estimated by the open circuit voltage estimation unit 101.

In the state detection system 1000, instead of the server device 3, the master ECU 40 estimates the open circuit voltage of the secondary battery 14, calculates the internal resistance value of the secondary battery 14, and the secondary battery based on the open circuit voltage and the internal resistance value. 14 may be discriminated from rising and deterioration, the rising flag and the deterioration flag may be transmitted to the server device 3, and the server device 3 may transmit the rising flag and the deterioration flag to the mobile terminal 4.

In the above-described embodiment, in step S105, it is determined whether the amount of increase in the internal resistance value exceeds the first threshold value, but instead of determining whether the amount of increase in the internal resistance value exceeds the first threshold value. , It may be determined whether the internal resistance value calculated in step S103 exceeds a predetermined threshold value for determining deterioration. Further, in step S105, instead of determining whether the increase amount of the internal resistance value exceeds the first threshold value, it is determined that the increase amount of the internal resistance value exceeds the first threshold value and the internal resistance value is deteriorated. It may be determined whether or not the predetermined threshold value is exceeded.

In the above-described embodiment, in step S107, it is determined whether the increase amount of the internal resistance value exceeds the second threshold value, but instead of determining whether the increase amount of the internal resistance value exceeds the second threshold value. , It may be determined whether the internal resistance value calculated in step S103 exceeds a predetermined threshold value for determining an increase. Further, in step S107, instead of determining whether the increase amount of the internal resistance value exceeds the second threshold value, it is determined that the increase amount of the internal resistance value exceeds the second threshold value and the internal resistance value increases. It may be determined whether or not the predetermined threshold value is exceeded.

In the secondary battery 14, the internal resistance value depends on the temperature. When the temperature is high, the internal resistance value is low, and when the temperature is low, the internal resistance value is high. Therefore, in the above-described embodiment, the internal resistance value calculated in step S103 may be corrected based on the measurement result of the temperature sensor 13. For example, the state detection device 1 stores a table in which the temperature and the correction coefficient are associated with each other in the storage unit 10f. After calculating the internal resistance value, the control unit 10 acquires a correction coefficient stored in association with the temperature measured by the temperature sensor 13, and multiplies the calculated internal resistance value by the acquired correction coefficient to obtain the internal resistance. Correct the value.

In the above-described embodiment, the method of calculating the internal resistance value using pulse discharge is a method of performing pulse discharge of a square wave having a predetermined period, but the discharge when calculating the internal resistance value has a predetermined period. It is not limited to the pulse discharge of a square wave. For example, a configuration in which a waveform different from that of a rectangular wave is discharged a predetermined number of times within a predetermined period, in other words, repeated discharges may be performed.

Needless to say, the state detection system 1000 according to the embodiment of the present invention can also handle other information as long as it does not adversely affect the information regarding the state of the secondary battery detected by the state detection device 1. not.

1 Status detector 10 Control unit 10a CPU
10b ROM
10ba program 10c RAM
10d communication unit 10e interface 10f storage unit 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 20 measurement unit 30 communication ECU
40 Master ECU
50 meter ECU
51 Instrument panel 101 Open circuit voltage estimation unit 102 Internal resistance calculation unit 103 Discrimination unit 104 First information transmission unit 105 First information reception unit 106 Notification unit 301 Second information reception unit 302 Second information transmission unit 303 Open circuit voltage estimation unit 304 Internal resistance calculation unit 305 Discrimination unit 1000 State detection system

Claims (19)

It is a state detection device that detects the state of the secondary battery mounted on the vehicle.
A measuring means for measuring the current and voltage of the secondary battery,
An open circuit voltage estimation means that estimates the open circuit voltage of the secondary battery based on the voltage measured by the measuring means, and an open circuit voltage estimating means.
An internal resistance calculating means for calculating the internal resistance value of the secondary battery based on the measurement result of the measuring means, and an internal resistance calculating means.
A discriminating means for discriminating between the deterioration of the secondary battery and the rise of the secondary battery by using the internal resistance value and the open circuit voltage.
A state detector equipped with. The internal resistance calculation means is the current and voltage measured by the measuring means when the secondary battery supplies power to the load, or the measuring means when the secondary battery is discharged a plurality of times within a predetermined period. The state detection device according to claim 1, wherein the internal resistance value is calculated based on the current and voltage measured in. A claim that notifies an external device of the deterioration of the secondary battery when the deterioration of the secondary battery is detected, and notifies the external device of the deterioration of the secondary battery when the deterioration of the secondary battery is detected. 1 or the state detection device according to claim 2. The discriminating means is any one of claims 1 to 3 for discriminating between the deterioration of the secondary battery and the rise of the secondary battery based on at least one of the increase in the internal resistance value and the internal resistance value. The state detection device described in the section. The amount of increase is the difference between the predetermined reference value and the internal resistance value measured by the internal resistance calculation means, or the predetermined reference value and the internal resistance value measured by the internal resistance calculation means. The state detection device according to claim 4, which is a ratio. The reference value when detecting the deterioration of the secondary battery is the minimum value among the past multiple calculations from the latest calculation of the internal resistance value, and the minimum value among the internal resistance values calculated in the past. The value according to claim 5, which is one of the value, the internal resistance value at the time of no deterioration, and the value calculated at the first time among the internal resistance values calculated a plurality of times after the state of the secondary battery has changed. State detector. The reference value when detecting the rise of the secondary battery is the minimum value among the past multiple calculations from the latest calculation of the internal resistance value, and the minimum value among the internal resistance values calculated in the past. The value according to claim 5, which is one of the value, the internal resistance value at the time of no deterioration, and the value calculated at the first time among the internal resistance values calculated a plurality of times after the state of the secondary battery has changed. State detector. When at least one of the increase amount calculated at a predetermined timing and the internal resistance value is equal to or higher than a predetermined threshold value, the secondary battery is raised or the secondary battery is raised. The state detection device according to claim 4, which is presumed to be in a close state. The secondary battery is raised or the secondary battery is raised based on the increase amount of the internal resistance value or the internal resistance value calculated for each period in which the drive unit of the vehicle equipped with the secondary battery is in a standby state. The state detection device according to claim 8, wherein the state is estimated to be close to rising. The internal resistance calculating means calculates the internal resistance value for each period in which the drive unit of the vehicle equipped with the secondary battery is in a standby state, and the discriminating means is the calculated increase amount of the internal resistance value or the said. The fourth aspect of claim 4, wherein the secondary battery is presumed to be deteriorated when the internal resistance value is equal to or higher than a predetermined threshold and the open circuit voltage or the voltage of the secondary battery is equal to or higher than the predetermined threshold. State detector. The state detection device according to claim 1, wherein deterioration of the secondary battery is estimated according to the ratio of the change in the internal resistance value to the change in the open circuit voltage. The state detection device according to claim 11, wherein deterioration of the secondary battery is estimated based on the amount of change in the ratio. The amount of change is the ratio of the change in the internal resistance value to the change in the open circuit voltage of the secondary battery or the voltage of the secondary battery when there is no deterioration, and the open circuit voltage or the open circuit voltage of the secondary battery after the start of use. The difference between the change in the internal resistance value and the change in the voltage of the secondary battery, or the internal resistance value with respect to the open circuit voltage of the secondary battery or the change in the voltage of the secondary battery when there is no deterioration. The state detection device according to claim 12, which is the ratio of the ratio of the change in the internal resistance value to the change in the open circuit voltage of the secondary battery or the change in the voltage of the secondary battery after the start of use with respect to the ratio of change. The measuring means measures the temperature of the secondary battery and
The state detection device according to any one of claims 1 to 13, further comprising a correction means for correcting the internal resistance value calculated by the internal resistance calculating means with the temperature measured by the measuring means. The state detection device according to any one of claims 1 to 14, further comprising a notification means for notifying the state of the secondary battery inside the vehicle based on the determination result of rising and deterioration. It is a state detection method that detects the state of the secondary battery mounted on the vehicle.
A measurement step for measuring the current and voltage of the secondary battery,
An open circuit voltage estimation step that estimates the open circuit voltage of the secondary battery based on the voltage measured in the measurement step,
An internal resistance calculation step for calculating the internal resistance value of the secondary battery based on the measurement result of the measurement step, and
A discrimination step for discriminating between deterioration of the secondary battery and rise of the secondary battery using the internal resistance value and the open circuit voltage, and
A state detection method. It is a state detection device that detects the state of the secondary battery mounted on the vehicle.
An open circuit voltage estimation means that estimates the open circuit voltage of the secondary battery based on the voltage measured by the measuring means that measures the current and voltage of the secondary battery.
An internal resistance calculating means for calculating the internal resistance value of the secondary battery based on the measurement result of the measuring means, and an internal resistance calculating means.
A discriminating means for discriminating between the deterioration of the secondary battery and the rise of the secondary battery by using the internal resistance value and the open circuit voltage.
A state detector equipped with. It is a state detection method that detects the state of the secondary battery mounted on the vehicle.
An open circuit voltage estimation step for estimating the open circuit voltage of the secondary battery based on the voltage measured by the measuring means for measuring the current and voltage of the secondary battery.
An internal resistance calculation step for calculating the internal resistance value of the secondary battery based on the measurement result of the measuring means, and
A discrimination step for discriminating between deterioration of the secondary battery and rise of the secondary battery using the internal resistance value and the open circuit voltage, and
A state detection method. It is a state detection system that has a state detection device and a server device and detects the state of the secondary battery mounted on the vehicle.
The state detection device is
A measuring means for measuring the current and voltage of the secondary battery,
A measurement result transmission means for transmitting the measurement result of the measurement means to the server device, and a measurement result transmission means.
An information receiving means for receiving rising information and deterioration information transmitted from the server device, and
Have,
The server device is
A measurement result receiving means for receiving the measurement result transmitted by the measurement result transmitting means, and a measurement result receiving means.
An open circuit voltage estimation means that estimates the open circuit voltage of the secondary battery based on the voltage included in the measurement result received by the measurement result receiving means.
An internal resistance calculating means for calculating the internal resistance value of the secondary battery based on the measurement result received by the measurement result receiving means, and an internal resistance calculating means.
A discriminating means for discriminating between the deterioration of the secondary battery and the rise of the secondary battery using the internal resistance value and the open circuit voltage.
Information transmission means for transmitting deterioration information indicating the determination result of deterioration of the secondary battery by the discrimination means and rise information representing the rise discrimination result of the secondary battery by the discrimination means to the state detection device.
A state detection system.

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