JP6523236B2 - Secondary battery state detection device and secondary battery state detection method - Google Patents

Description

  The present invention relates to a secondary battery state detection device and a secondary battery state detection method.

  According to Patent Document 1, a discharge circuit including a semiconductor switch and a resistance element is connected to a secondary battery, and the secondary battery is discharged by the discharge circuit, and the change in voltage and current of the secondary battery at that time There is disclosed a technique for detecting the state of a secondary battery.

JP, 2006-090847, A

  By the way, in the technique disclosed in Patent Document 1, since it is necessary to pass a current of several amperes to several tens of amperes, a resistor element with a large rated power (for example, several tens of watts to several hundreds of watts) is used. There is a need. For this reason, there is a problem that the manufacturing cost of the device increases and the size of the device increases.

  In addition, when a resistive element having a constant element value is used, the dischargeable current is determined by the element value, and therefore, there is a problem that an optimum current value can not be set according to the state of the secondary battery, for example. .

  The present invention has been made in view of the above circumstances, and a secondary battery state detection device and a secondary battery capable of accurately detecting the state of a secondary battery while suppressing the manufacturing cost of the device. The purpose is to provide a state detection method.

In order to solve the above problems, the present invention controls a secondary battery state detection device for detecting a state of a secondary battery mounted in a vehicle, and controls a predetermined electric component equipped in the vehicle at a predetermined timing. Control means for operating the battery and discharging the secondary battery, and measuring means for measuring the voltage and current of the secondary battery when the secondary battery is discharged under the control of the control means, and the measurement Detecting means for detecting the state of the secondary battery from the voltage and current of the secondary battery measured by means, and the control means detects the detection object of the detection means or the state of the secondary battery In response, the electric component or combination of electric components to be operated is selected .

The present invention further comprises recording means for measuring and recording the voltage and / or current of the secondary battery when the electric component is operated, and the control means is a voltage recorded in the recording means. The electric component or the combination of electric components is selected with reference to and / or current.
According to such a configuration, it is possible to select an optimal electrical component or a combination of electrical components based on the recorded voltage and / or current.

The present invention further comprises recording means for measuring and recording temporal changes in the voltage and / or current of the secondary battery when the electrical component is operated, and the control means comprises the recording means. The electrical component or the combination of electrical components is selected with reference to the temporal change of the recorded voltage and / or current.
According to such a configuration, it is possible to select an optimal electrical component or a combination of electrical components based on temporal change in the recorded voltage and / or current.

Further, in the present invention, the measurement means further detects the temperature of the secondary battery, and the detection means determines the state of the secondary battery based on the voltage, the current, and the temperature measured by the measurement means. To detect.
According to such a configuration, it is possible to more accurately detect the state of the secondary battery with reference to the temperature of the secondary battery.

Further, according to the present invention, in a secondary battery state detecting device for detecting a state of a secondary battery mounted in a vehicle, a predetermined electric component equipped in the vehicle is controlled and operated at a predetermined timing, Control means for discharging the secondary battery, measurement means for measuring the voltage and current of the secondary battery when the secondary battery is discharged under the control of the control means, and the above measured by the measurement means Detecting means for detecting the state of the secondary battery from the voltage and current of the secondary battery, and the control means is configured to perform the electric component when a predetermined time has elapsed since the engine of the vehicle is stopped. A product is controlled and operated at a predetermined timing to discharge the secondary battery .
According to such a configuration, when the polarization and the like are eliminated, the state of the secondary battery can be accurately detected.

Further, according to the present invention, in a secondary battery state detecting device for detecting a state of a secondary battery mounted in a vehicle, a predetermined electric component equipped in the vehicle is controlled and operated at a predetermined timing, Control means for discharging the secondary battery, measurement means for measuring the voltage and current of the secondary battery when the secondary battery is discharged under the control of the control means, and the above measured by the measurement means Detecting means for detecting the state of the secondary battery from the voltage and current of the secondary battery , wherein the measuring means and the detecting means are configured as a first device, and the control means is the first device And a second device independent of the second device, wherein the first device is disposed near the secondary battery, and the second device is disposed at a different place from the first device. Do.
According to such a configuration, the first device is miniaturized, and the first device is disposed in the vicinity of the secondary battery where the installation space is limited, thereby reducing the influence of the impedance component caused by the wiring routing. The state of the secondary battery can be detected with high accuracy, and the reduction in weight due to the miniaturization of the first device can prevent the detection accuracy from being lowered by vibration.

Further, according to the present invention, in the secondary battery state detection method for detecting the state of a secondary battery mounted in a vehicle, a predetermined electric component equipped in the vehicle is controlled and operated at a predetermined timing, The control step of discharging the secondary battery, the measurement step of measuring the voltage and current of the secondary battery when the secondary battery is discharged by the control in the control step, and the measurement measured in the measurement step Detecting the state of the secondary battery from the voltage and current of the secondary battery, and the control step is operated according to the detection target of the detection step or the state of the secondary battery And selecting an electrical component or a combination of electrical components .

  According to the present invention, it is possible to provide a secondary battery state detection device and a secondary battery state detection method capable of accurately detecting the state of a secondary battery while suppressing the manufacturing cost of the device.

It is a figure which shows the structural example of the secondary battery state detection apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the detailed structural example of the control part shown in FIG. It is a block diagram which shows the detailed structural example of the secondary battery state detection part shown in FIG. It is an example of the equivalent circuit model of the secondary battery detected by 1st Embodiment shown in FIG. It is a flowchart for demonstrating the operation | movement of 1st Embodiment of this invention. It is a flowchart for demonstrating the operation | movement of 2nd Embodiment of this invention. It is a figure which shows the structural example of the secondary battery state detection apparatus which concerns on 3rd Embodiment of this invention. It is a flowchart for demonstrating the operation | movement of 3rd Embodiment of this invention. It is a figure which shows the structural example of the secondary battery state detection apparatus which concerns on 4th Embodiment of this invention. It is a flowchart for demonstrating the operation | movement of 4th Embodiment of this invention.

  Next, an embodiment of the present invention will be described.

(A) Description of Configuration of First Embodiment of the Present Invention FIG. 1 is a diagram showing a power supply system of a vehicle having a secondary battery state detection device according to a first embodiment of the present invention. In this figure, the secondary battery state detection device according to the first embodiment of the present invention includes a control unit 10 and a secondary battery state detection unit 11. Here, the control unit 10 is connected to the secondary battery state detection unit 11 via a LIN (Local Interconnect Network) 12 and exchanges information with the secondary battery state detection unit 11 and can also be used as a CAN (Controller Area Network). 13, the electric components 15-1 to 15-n (n ≧ 1) are connected to control the electric components 15-1 to 15-n.

  FIG. 2 is a diagram showing a detailed configuration example of the control unit 10 shown in FIG. As shown in FIG. 2, the control unit 10 includes a central processing unit (CPU) 10a, a read only memory (ROM) 10b, a random access memory (RAM) 10c, a LIN I / F (interface) 10d, and a CAN I. It has / F10e. Here, the CPU 10a controls each unit based on the program 10ba stored in the ROM 10b. The ROM 10 b is constituted by a semiconductor memory or the like, and stores the program 10 ba or the like. The RAM 10 c is configured by a semiconductor memory or the like, and stores parameters 10 ca and the like such as data generated when the program 10 ba is executed. The LIN I / F 10 d converts the data expression format when exchanging information with the secondary battery state detection unit 11 via the LIN 12. The CAN I / F 10 e converts a data expression format when exchanging information with the electrical components 15-1 to 15-n via the CAN 13.

  FIG. 3 is a view showing a configuration example of the secondary battery state detection unit 11 shown in FIG. As shown in this figure, the secondary battery state detection unit 11 includes a CPU 11a, a ROM 11b, a RAM 11c, a LIN I / F 11d, an I / F 11e, and a sensor unit 11f. Here, the CPU 11a controls each unit based on the program 11ba stored in the ROM 11b. The ROM 11 b is configured by a semiconductor memory or the like, and stores the program 11 ba or the like. The RAM 11 c is configured by a semiconductor memory or the like, and stores parameters 11 ca and the like of data and the like generated when the program 11 ba is executed. The LIN I / F 11 d converts the data expression format when exchanging information with the control unit 10 via the LIN 12. The I / F 11 e converts a signal output from the sensor unit 11 f into a digital signal and inputs the digital signal. The sensor unit 11 f includes, for example, a voltage sensor, a current sensor, and a temperature sensor, and measures the voltage, current, and temperature (for example, the temperature of the electrolyte of the secondary battery 14) of the secondary battery 14. Output the corresponding signal. The control unit 10 and the secondary battery state detection unit 11 are configured independently. The secondary battery state detection unit 11 is disposed in the vicinity of the secondary battery 14, and the control unit 10 is disposed in a place different from the secondary battery state detection unit 11.

  The secondary battery 14 is made of, for example, a lead storage battery, a nickel cadmium battery, or a nickel hydrogen battery, and is charged by an alternator (not shown) to supply power to the electrical components 15-1 to 15-n.

  The electrical components 15-1 to 15-n are configured by electrical components provided in the vehicle. As the electrical components 15-1 to 15-n, for example, there are a heat wire deformer which is a resistive electrical component, a seat heater, a light, and the like. In addition, there are a motor, an inductance coil and the like which are inductive electrical components. Other electric components (car audio, car navigation, etc.) may be used.

(B) Description of Operation of the First Embodiment of the Present Invention Next, the operation of the first embodiment of the present invention will be described. In the following, first, the outline of the operation of the first embodiment will be described, and then the detailed operation will be described with reference to FIG.

  When a predetermined time (for example, four hours after the engine stop which reduces the polarization of the secondary battery 14) has elapsed since the engine of the vehicle was stopped, the control unit 10 selects one of the electrical components 15-1 to 15-n. Select to start the operation. For example, when the electrical component 15-1 is selected, the control unit 10 instructs the electrical component 15-1 to start operation. As a result, the electric component 15-1 starts operation, and a current flows from the secondary battery 14 to the electric component 15-1. At this time, the secondary battery state detection unit 11 measures temporal changes in voltage and current of the secondary battery 14 and the temperature at that time by the sensor unit 11f, and the obtained measured value is used as the parameter 11ca in the RAM 11. Store.

  The above operation is performed for each of the electrical components 15-1 to 15-n. As a result, in the RAM 11 of the secondary battery state detection unit 11, information indicating temporal changes in voltage and current of the secondary battery 14 when each of the electrical components 15-1 to 15-n is operated; Information indicating the temperature is stored as a parameter 11 ca.

  When the above operations for each of the electrical components 15-1 to 15-n are completed, combination processing for obtaining a desired current waveform is performed. More specifically, when performing learning processing of the equivalent circuit model of the secondary battery 14, it is desirable to flow a rectangular wave, but in order to obtain such a rectangular wave, the electrical components 15-1 to 15-n Execute combining processing as a load. For example, when passing through a rectangular wave having a current value of 10 A, if the current flowing through the heat wire deformer is 5 A, for example, it is necessary to combine with a sheet heater through which a current of 5 A flows. It can be done. Further, when a large inrush current is required, for example, a motor can be selected. Not only a plurality of electrical components but also a single electrical component can be selected as the electrical components to be selected. By the above processing, a combination of electrical components for obtaining various current waveforms can be obtained.

  Next, when it is determined that the state of the secondary battery 14 is to be detected, the control unit 10 selects a current waveform according to the state to be detected. For example, when the conductor resistance Rohm, the reaction resistances Rct1 and Rct2, and the electric double layer capacitances C1 and C2 as shown in FIG. 4 are used as the equivalent circuit model of the secondary battery 14, such an equivalent circuit model is configured When obtaining the element value of the circuit element to be obtained by learning processing, for example, a current waveform for flowing a rectangular wave of about several A is selected.

  When the selection of the current waveform is completed, the control unit 10 controls and operates a corresponding one of the electrical components 15-1 to 15-n in order to pass the selected current waveform. For example, in the case of learning the element value of the circuit element shown in FIG. 4, the electrical component (for example, heat ray deformer) for passing the rectangular wave is operated for a predetermined time according to the rectangular wave.

  Although the case of learning the equivalent circuit model using a rectangular wave has been described as an example, the same current waveform (for example, a rectangular wave) may be used to check the deterioration state of the secondary battery 14, for example. Change the current value and discharge several times to measure the change in current and the change in voltage. When the secondary battery 14 is new, there is a linear relationship between the current and the voltage (the voltage decreases in proportion to the increase of the current), but the nonlinear relationship as the deterioration of the secondary battery 14 progresses (A relationship in which the drop in voltage becomes larger when the current increases) occurs, so the deterioration of the secondary battery 14 can be estimated by detecting such a relationship.

  Also, for example, when verifying whether or not the SOC estimated based on the equivalent circuit model is correct, it is possible to use a rectangular wave having a larger current value and a longer time than when measuring the equivalent circuit model. For example, even if it is determined that the SOC is equal to or higher than a predetermined lower limit (for example, 20%), the voltage drops when the secondary battery 14 is discharged by a rectangular wave having a large current value and a long duration. If the slope of the value of is larger than the predetermined threshold value, it is determined that the estimation of the SOC is not correct (less than the predetermined lower limit value), and charging of the secondary battery 14 is started or the use is stopped. be able to.

  Further, in the case where the circuit elements constituting the equivalent circuit model shown in FIG. 4 are subjected to learning processing, an optimal current waveform may be used for each circuit element to be learned. For example, in the case of the reaction resistances Rct1 and Rct2, learning can be performed more quickly by using a current larger than the conductor resistance Rohm. Therefore, in the case of learning the reaction resistances Rct1 and Rct2, the conductor resistance Rohm is Can also use large currents.

  The secondary battery state detection unit 11 measures the voltage, the current, and the temperature of the secondary battery 14 by the sensor unit 11 f when the secondary battery 14 is discharged to the selected electric component, and the measurement is performed. The obtained data is stored in the RAM 11 c as a parameter 11 ca.

  When the discharge is completed, the secondary battery state detection unit 11 detects the state of the secondary battery 14 based on the change in voltage and current stored in the RAM 11 c as the parameter 11 ca, and corrects it by the temperature at that time. Thus, the state of the secondary battery 14 can be detected.

  The control unit 10 controls the charge state of the secondary battery 14 by adjusting the generated voltage of an alternator (not shown) according to the state of the secondary battery 14 detected by the secondary battery state detection unit 11, When the deterioration of the secondary battery 14 progresses, the user can be notified.

  Next, an example of processing executed in the first embodiment shown in FIG. 1 will be described with reference to the flowchart shown in FIG. The flowchart shown in FIG. 5 is executed, for example, when a predetermined time (for example, four hours when the polarization of the secondary battery 14 decreases) has passed since the engine of the vehicle was stopped. When the flowchart shown in FIG. 5 is started, the following steps are performed.

  In step S10, the secondary battery state detection unit (hereinafter, appropriately referred to as "detection unit") 11 instructs the control unit 10 to execute a process of generating a current waveform for state detection. More specifically, the secondary battery state detection unit 11 transmits, via the LIN 12, a control signal instructing the control unit 10 to execute a process of generating a current waveform for state detection.

  In step S11, the control unit 10 selects a specific electrical component. More specifically, the control unit 10 selects, for example, an electrical component 15-1 that is a heat wire deformer from the electrical components 15-1 to 15-n.

  In step S12, the control unit 10 instructs the electrical component selected in step S11 to start the operation. More specifically, the control unit 10 transmits, for example, a control signal instructing to start the operation to the electrical component 15-1 selected in step S11 via the CAN 13. As a result, the electrical component 15-1 starts operation. For example, when the electrical component 15-1 is a heat wire deformer, since the impedance of the heat wire deformer is close to a pure resistance, a current (for example, a current of several A to several tens A) flows according to the resistance value of the heat wire deformer. .

  In step S13, the secondary battery state detection unit 11 detects the voltage, current, and temperature of the secondary battery 14. More specifically, the secondary battery state detection unit 11 detects temporal changes in voltage and current of the secondary battery 14 and the temperature at that time by the sensor unit 11 f, and stores the same in the RAM 11 c as a parameter 11 ca.

  In step S14, the control unit 10 stops the operation of the electrical component when a predetermined time (for example, several seconds to several tens of seconds) elapses. More specifically, when a predetermined time (for example, 10 seconds) has elapsed since the operation of the heat ray deformer starts, a control signal is sent to the electrical component 15-1 via the CAN 13, and the electrical component 15-1 Stop the operation of In addition, it is desirable to set the time to measure a little longer than the time to operate in step S19-step S21. This is to prevent a sudden change in current before and after the operation stop.

  In step S15, when the control unit 10 determines whether the measurement process for all the electrical components 15-1 to 15-n is completed and determines that the process is completed (step S15: Y), the process proceeds to step S16. If not (step S15: N), the process proceeds to step S16. By repeating the process of steps S11 to S15, the RAM 11c of the secondary battery state detection unit 11 stores the waveforms of current and voltage flowing at the time of operation of the electrical components 15-1 to 15-n and the temperature at that time. Be done.

  In step S16, the secondary battery state detection unit 11 executes a combination process of current waveforms. More specifically, the secondary battery state detection unit 11 converts the current waveform of the electrical components 15-1 to 15-n stored in the RAM 11c of the secondary battery state detection unit 11 into a current waveform according to the purpose. Perform combined processing as needed. The purpose of combination is (1) current value, (2) current waveform, and (3) duration. First, (1) As the current value, it is necessary to select a combination of 20 A if the required current value is 20 A and the maximum current of the electrical components 15-1 to 15-n is 15 A So choose a combination that meets 20A. Further, as (2) the current waveform, for example, it is possible to select a hot wire deformer, a headlight, a room light or the like having an impedance close to a pure resistance through which a constant current flows to obtain a rectangular wave. Further, a DC motor or the like can be selected to obtain a current waveform having a large inrush current. Furthermore, as (3) duration, for example, when it is necessary to flow a predetermined current for several tens of seconds, the maximum current duration of the electrical components 15-1 to 15-n is several seconds. Since it is necessary to operate a plurality of electrical components sequentially or to operate the same electrical components repeatedly, it is necessary to select such electrical components. Note that a single electrical component may be selected instead of combining and selecting a plurality of electrical components.

  In step S17, the secondary battery state detection unit 11 determines whether or not to detect the state of the secondary battery 14. If it is determined to detect the state (step S17: Y), the process proceeds to step S18. If not (step S17: N), the same process is repeated.

  In step S18, the secondary battery state detection unit 11 selects a current waveform according to the state of the secondary battery 14 to be detected, and instructs the control unit 10 on the corresponding electric component. For example, when performing learning processing of the element value of the circuit element which comprises the equivalent circuit model shown in FIG. 4, the rectangular wave by the electrical component 15-1 which is a heat wire defogger is selected.

  In step S19, based on the instruction from secondary battery state detection unit 11, control unit 10 instructs the corresponding electrical component to start operation. For example, when the electric component 15-1 is operated, the electric component 15-1 is instructed to start operation via the CAN 13.

  In step S20, the secondary battery state detection unit 11 detects the voltage, current, and temperature of the secondary battery 14 by the operation of the electrical component. More specifically, the secondary battery state detection unit 11 detects the voltage, current, and temperature of the secondary battery 14 by the sensor unit 11 f, and stores the detected voltage, current, and temperature in the RAM 11 c as the parameter 11 ca.

  In step S21, the control unit 10 instructs the corresponding electrical component to stop the operation based on the instruction from the secondary battery state detection unit 11. For example, when stopping the operation of the electric component 15-1, the electric component 15-1 is instructed via the CAN 13 to stop the operation. As a result, since the heat wire deformer which is the electric component 15-1 is in the ON state only for a predetermined time, a rectangular wave shaped current flows from the secondary battery 14 to the electric component 15-1.

  In step S22, the secondary battery state detection unit 11 detects the state of the secondary battery 14 from the voltage, current, and temperature detected in step S20. More specifically, the secondary battery state detection unit 11 learns the element values of the circuit elements constituting the equivalent circuit model of the secondary battery 14 based on the voltage and current change due to the discharge by the rectangular wave current.

  As described above, according to the first embodiment of the present invention, since the state of the secondary battery 14 is detected using the electrical components mounted in advance in the vehicle, the discharge circuit becomes unnecessary. Thus, the manufacturing cost of the device can be reduced and the size of the device can be reduced.

  Further, in the first embodiment of the present invention, since the electrical components are selected or the combination of the electrical components is selected according to the condition to be detected, etc., the condition to be detected or the like Optimum current waveform can be obtained.

  Further, in the first embodiment of the present invention, the current or the like flowing to the electrical component is measured before detecting the status of the secondary battery 14, so that it is possible to appropriately cope with a change in the status of the electrical component. be able to.

(C) Description of Configuration of Second Embodiment of the Present Invention Next, a second embodiment of the present invention will be described. The configuration of the second embodiment of the present invention is the same as that of the first embodiment shown in FIG. 1 and the operation is different, so the description of the configuration of the second embodiment will be omitted.

(D) Description of the Operation of the Second Embodiment of the Present Invention Next, the operation of the second embodiment of the present invention will be described. FIG. 6 is a flowchart for explaining an example of processing executed in the second embodiment. In FIG. 6, parts corresponding to those in FIG. 5 are assigned the same reference numerals and descriptions thereof will be omitted. Compared with FIG. 5, in FIG. 6, steps S10, S13, S16, S18 and S19 are excluded and steps S30 to S35 are added. The following description will focus on the processes of steps S30 to S35.

  In step S30, the secondary battery state detection unit 11 instructs the control unit 10 to generate a current waveform for state detection. More specifically, for example, the secondary battery state detection unit 11 transmits, to the control unit 10, requirements such as a current waveform, a current value, and a duration, and instructs the control unit 10 to generate a necessary waveform. Do.

  In step S31, the control unit 10 acquires from the secondary battery state detection unit 11 the measurement results of the voltage, current, and temperature at which the electric component instructed in step S12 operates, from the secondary battery state detection unit 11, and the parameters are stored in the RAM 10c. Record as 10 ca. By repeating the process of steps S11 to S15, the control unit 10 measures the voltage, the current, and the temperature at the time of operating the electrical components 15-1 to 15-n, respectively, and the parameter 10ca in the RAM 10c. Store as

  In step S32, control unit 10 refers to the measurement value measured by the process of step S11 to step S15 and stored in RAM 10c by the process of step S31, and the condition of the waveform for state detection instructed to generate in step S30. Execute a process to find a combination that satisfies By this processing, for example, control information including electrical components according to the respective waveforms, control timing of power on, and control timing of power off is generated.

  In step S33, the secondary battery state detection unit 11 notifies the control unit 10 of a state in which the secondary battery 14 is to be detected. For example, when it is determined in step S17 that the secondary battery state detection unit 11 detects an element value of a circuit element constituting the equivalent circuit model shown in FIG. .

  In step S34, control unit 10 selects a current waveform corresponding to the notification in step S33. For example, when detecting the element values of the circuit elements constituting the equivalent circuit model shown in FIG. 4, the control unit 10 selects a rectangular wave, and selects control information for generating a rectangular wave.

  In step S35, the control unit 10 refers to the control information for generating the current waveform selected in step S34, and controls the target electrical component based on the control information. For example, when detecting the element value of the circuit element constituting the equivalent circuit model shown in FIG. 4, the electric component 15-1 which is the heat ray deformer is selected, and the rectangular wave is generated by the electric component 15-1. And control the electrical component 15-1 based on the control information. Then, in step S21, the control unit 10 instructs the electrical component to stop the operation. Thus, a rectangular wave current flows from the secondary battery 14 to the electrical component 15-1.

  When such a rectangular wave discharge is performed, the secondary battery state detection unit 11 measures the voltage, current, and temperature of the secondary battery 14 in step S21, and based on the measurement result in step S22. The element values of the circuit elements constituting the equivalent circuit model of the secondary battery 14 are determined by learning processing.

  As described above, according to the second embodiment of the present invention, since the control unit 10 executes combination processing of current waveforms, etc., the burden on the secondary battery state detection unit 11 can be reduced. it can. Further, by causing the control unit 10 using a highly functional CPU 10 a or the like to execute such a process, the process can be performed quickly.

(E) Description of Configuration of Third Embodiment of the Present Invention Next, a third embodiment of the present invention will be described. FIG. 7 is a view showing a configuration example of the third embodiment of the present invention. In FIG. 7, parts corresponding to those in FIG. 1 are assigned the same reference numerals and descriptions thereof will be omitted. In addition, when FIG. 7 is compared with FIG. 1, while the secondary battery state detection part 11 is remove | excluded, the voltage sensor 20, the current sensor 21, and the temperature sensor 22 are added. The configuration other than these is the same as in the case of FIG.

  Here, the voltage sensor 20 measures the voltage of the secondary battery 14 and notifies the control unit 10 of the measurement result via the LIN 12. The current sensor 21 measures the current of the secondary battery 14 and notifies the control unit 10 of the measurement result via the LIN 12. The temperature sensor 22 measures the temperature of the secondary battery 14 (for example, the liquid temperature of the secondary battery 14), and notifies the control unit 10 of the measurement result via the LIN 12.

(F) Description of operation of the third embodiment of the present invention Next, the operation of the third embodiment of the present invention will be described. FIG. 8 is a flowchart for explaining the operation of the third embodiment. Parts in FIG. 8 corresponding to those in FIG. 5 are assigned the same codes as in FIG. In FIG. 8, as compared with FIG. 5, steps S10, S13, S16, and S18 to S22 are excluded, and steps S50 to S56 are added. Below, it demonstrates centering around step S50-step S56.

  In step S50, the control unit 10 starts the operation of the electrical component selected in the process of step S12. Therefore, the voltage, current, and temperature of the secondary battery 14 at that time are compared with the voltage sensor 20 and the current sensor 21. And each measured by the temperature sensor 22 and stored in the RAM 10 c as a parameter 10 ca. By repeating the process of step S11 to step S15, the measurement result regarding the electrical components 15-1 to 15-n is stored in the RAM 10c as the parameter 10ca.

  In step S51, the control unit 10 executes a combination process of current waveforms. More specifically, the voltage, current, and temperature when the electrical components 15-1 to 15-n are operated as the parameter 10ca are stored in the RAM 10c of the control unit 10 by the processes of steps S11 to S15. By combining these as appropriate, a target current waveform can be obtained.

  In step S52, the control unit 10 selects a current waveform corresponding to the content of the state detection determined to be performed in step S17. For example, when detecting the element value of the circuit element which comprises the equivalent circuit model of the secondary battery 14, a rectangular wave is selected, for example.

  In step S53, the control unit 10 instructs the electrical component for generating the current waveform selected in step S52 to start the operation. For example, when the electric component 15-1 is operated, the electric component 15-1 is instructed to start operation via the CAN 13.

  In step S54, control unit 10 measures the voltage, current, and temperature of secondary battery 14 with voltage sensor 20, current sensor 21, and temperature sensor 22, respectively, and stores the measurement result in RAM 10c as parameter 10ca. .

  In step S55, the control unit 10 instructs the electrical component which has instructed the operation start in step S53 to stop the operation. As a result, for example, since the heat wire deformer which is the electrical component 15-1 is in the ON state only for a predetermined time, a rectangular wave shaped current flows from the secondary battery 14 to the electrical component 15-1.

  In step S56, the control unit 10 detects the state of the secondary battery 14 based on the voltage, current, and temperature measured in step S54. For example, the element values of the circuit elements constituting the equivalent circuit model shown in FIG. 4 can be obtained by learning processing.

  As described above, according to the third embodiment of the present invention, since the secondary battery state detection unit 11 can be omitted, the configuration of the device can be simplified.

(G) Description of Configuration of Fourth Embodiment of the Present Invention Next, a fourth embodiment of the present invention will be described. FIG. 9 is a view showing a configuration example of the fourth embodiment of the present invention. In FIG. 9, parts corresponding to FIG. 7 are assigned the same reference numerals and descriptions thereof will be omitted. In FIG. 9, the control unit 10 is replaced with a secondary battery state detection unit 11A as compared with FIG. The other configuration is the same as that shown in FIG.

  Here, the secondary battery state detection unit 11A excludes the sensor unit 11f of the secondary battery state detection unit 11 shown in FIG. 3, and connects the voltage sensor 20, the current sensor 21 and the temperature sensor 22 shown in FIG. Have the following configuration. The configuration other than this is the same as in the case of FIG.

(H) Description of the Operation of the Fourth Embodiment of the Present Invention Next, the operation of the fourth embodiment shown in FIG. 9 will be described with reference to FIG. In FIG. 10, parts corresponding to those in FIG. 5 are assigned the same reference numerals and descriptions thereof will be omitted. In the example of FIG. 10, compared with FIG. 5, steps S10 to S15, S19, and S21 are excluded, and steps S70 to 76 are added. The following description will focus on steps S70 to S76.

  In step S70, the secondary battery state detection unit 11A selects an electrical component to be measured from the electrical components 15-1 to 15-n. For example, the secondary battery state detection unit 11A selects the electrical component 15-1.

  In step S71, secondary battery state detection unit 11A instructs the electrical component selected in step S70 to start operation. For example, the secondary battery state detection unit 11A instructs the electrical component 15-1 to start operation. As a result, the electrical component 15-1 starts its operation.

  In step S72, the secondary battery state detection unit 11A processes the voltage, current, and temperature of the secondary battery 14 according to the operation of the electrical component started in step S71 as the voltage sensor 20, the current sensor 21, and the temperature sensor. Measured according to 22 and stored in the RAM 11 c as a parameter 11 ca.

  In step S73, the secondary battery state detection unit 11A instructs the electrical component which has instructed the operation start in step S71 to stop the operation. For example, the secondary battery state detection unit 11A instructs the electrical component 15-1 in operation to stop operation.

  In step S74, the secondary battery state detection unit 11A determines whether all the measurements of the electrical components 15-1 to 15-n have ended, and when it is determined that all the measurements have ended (step S74: In Y), the process proceeds to step S16, and in other cases (step S74: N), the process returns to step S70 and the same process as described above is repeated. For example, the measurement is sequentially performed from the electrical component 15-1, and when the measurement of the electrical component 15-n is completed, it is determined as Y and the process proceeds to step S16.

  In step S16, the secondary battery state detection unit 11A obtains a desired waveform according to the voltage, current, and temperature of the electrical components 15-1 to 15-n measured by the processes of steps S70 to S74. As such, combine them appropriately. When it is determined in step S17 that the state detection of the secondary battery 14 is to be performed (step S17: Y), the process proceeds to step S18. In step S18, a waveform corresponding to the state to be detected is selected.

  In step S75, the secondary battery state detection unit 11A selects an electrical component corresponding to the current waveform selected in step S18, and instructs start of operation. For example, when passing a rectangular wave to the secondary battery 14 using the electric component 15-1, the secondary battery state detection unit 11A instructs the electric component 15-1 to start operation. Thereafter, in step S20, the secondary battery state detection unit 11A measures the voltage, current, and temperature of the secondary battery 14 by the operation of the electrical component for which the operation start has been instructed in step S75, and measures in step S22. The state of the secondary battery 14 is detected based on the voltage, current, and temperature. For example, when the element value of the circuit element constituting the equivalent circuit model of the secondary battery 14 is determined, the electrical component 15-1 is caused to execute discharge by a rectangular wave, and the voltage and current of the secondary battery 14 at that time; And, based on the temperature, the element value of the circuit element can be determined by learning processing.

  In step S76, the secondary battery state detection unit 11A instructs the corresponding electrical component to stop the operation. For example, when stopping the operation of the electric component 15-1, the electric component 15-1 is instructed via the CAN 13 to stop the operation. As a result, since the heat wire deformer which is the electric component 15-1 is in the ON state only for a predetermined time, a rectangular wave shaped current flows from the secondary battery 14 to the electric component 15-1.

  As described above, according to the fourth embodiment of the present invention, since the control unit 10 can be omitted, the configuration of the apparatus can be simplified.

(C) Description of Modified Embodiments It goes without saying that each of the above-described embodiments is an example, and the present invention is not limited to only the above-described case. For example, in the above embodiment, the electrical components 15-1 to 15-n are electrical components installed in a vehicle, but for example, a discharge circuit including a resistance element and a semiconductor switch similar to those in the related art is provided It is also good. According to such a configuration, by operating the discharge circuit and the electrical components 15-1 to 15-n in combination, the current flowing through the discharge circuit is reduced as compared with the prior art, thereby reducing the manufacturing cost of the discharge circuit. be able to.

  In each of the above embodiments, the electrical components 15-1 to 15-n start and stop the operation, and the current flowing at that time detects the state of the secondary battery 14. However, the current waveform may be set to a desired shape by controlling the power supply of the electrical component on / off based on PWM (Pulse Width Modulation).

  In each of the above embodiments, when measuring electrical components, voltage, current, and temperature are measured. However, at least one of voltage and current is measured, and electrical components are measured based on the measurement results. May be selected. Further, temporal changes in at least one of the voltage and the current may be measured, and the electrical component may be selected based on the measurement result.

  In each of the above embodiments, the electric components 15-1 to 15-n are controlled via the CAN 13, and the control unit 10 and the secondary battery state detection unit 11 exchange information via the LIN 12. Other buses may be used.

  Also, the equivalent circuit model shown in FIG. 4 is an example, and other equivalent circuit models may be used. For example, in the example of FIG. 4, two reaction resistances (Rct1, Rct2) and electric double layer capacitances (C1, C2) connected in parallel are provided, but one or three or more. You may

  In each of the above embodiments, after the electrical components 15-1 to 15-n are operated and measured, the state detection of the secondary battery 14 is performed, but these are separately performed. You may For example, the electrical components 15-1 to 15-n may be operated to store the measurement results, and the state detection of the secondary battery 14 may be performed based on the measurement results at another opportunity.

  Further, in each of the above embodiments, the processing is performed while the engine of the vehicle is stopped, but the processing may be performed while traveling.

10 Control unit (control means, detection means)
10a CPU
10b ROM
10c RAM (recording means)
10d LIN I / F
10e CAN I / F
11 Secondary battery state detection unit (control means, detection means)
11a CPU
11b ROM
11c RAM (recording means)
11d LIN I / F
11e I / F
11f Sensor (Measurement means)
12 LIN
13 CAN
14 Secondary battery 15-1 to 15-n Electrical components 20 Voltage sensor (measurement means)
21 Current sensor (measuring means)
22 Temperature sensor (measuring means)

Claims (7)

In a secondary battery state detection device for detecting a state of a secondary battery mounted in a vehicle,
A control unit configured to control and operate a predetermined electrical component equipped in the vehicle at a predetermined timing, and to discharge the secondary battery;
Measurement means for measuring the voltage and current of the secondary battery when the secondary battery is discharged by the control of the control means;
Detecting means for detecting the state of the secondary battery from the voltage and current of the secondary battery measured by the measuring means ;
The control means selects the electric component or combination of electric components to be operated according to the detection target of the detection unit or the state of the secondary battery.
A secondary battery state detection device characterized in that. It has recording means for measuring and recording the voltage and / or current of the secondary battery when the electric component is operated,
The secondary battery state detection device according to claim 1, wherein the control means selects the electric component or the combination of the electric components by referring to the voltage and / or current recorded in the recording unit. . And recording means for measuring and recording temporal changes in voltage and / or current of the secondary battery when the electrical component is operated,
The secondary according to claim 1, wherein the control means selects the electric component or the combination of the electric components with reference to temporal change of voltage and / or current recorded in the recording means. Battery status detection device. The measuring means further detects the temperature of the secondary battery,
The detection means detects the state of the secondary battery based on the voltage, current, and temperature measured by the measurement means.
The secondary battery state detection device according to any one of claims 1 to 3, characterized in that. In a secondary battery state detection device for detecting a state of a secondary battery mounted in a vehicle,
A control unit configured to control and operate a predetermined electrical component equipped in the vehicle at a predetermined timing, and to discharge the secondary battery;
Measurement means for measuring the voltage and current of the secondary battery when the secondary battery is discharged by the control of the control means;
Detecting means for detecting the state of the secondary battery from the voltage and current of the secondary battery measured by the measuring means;
The control means controls and operates the electric component at a predetermined timing to discharge the secondary battery when a predetermined time has elapsed since the engine of the vehicle is stopped.
A secondary battery state detection device characterized in that. In a secondary battery state detection device for detecting a state of a secondary battery mounted in a vehicle,
A control unit configured to control and operate a predetermined electrical component equipped in the vehicle at a predetermined timing, and to discharge the secondary battery;
Measurement means for measuring the voltage and current of the secondary battery when the secondary battery is discharged by the control of the control means;
Detecting means for detecting the state of the secondary battery from the voltage and current of the secondary battery measured by the measuring means;
The measuring means and the detecting means are configured as a first device, and the control means is configured as a second device independent of the first device,
The first device is disposed near the secondary battery, and the second device is disposed at a different place from the first device.
A secondary battery state detection device characterized in that. In a secondary battery state detection method for detecting a state of a secondary battery mounted in a vehicle,
A control step of controlling and operating a predetermined electric component equipped in the vehicle at a predetermined timing, and discharging the secondary battery;
Measuring the voltage and current of the secondary battery when the secondary battery is discharged by the control in the control step;
Detecting the state of the secondary battery from the voltage and current of the secondary battery measured in the measuring step;
The control step selects the electrical component or combination of electrical components to be operated according to the detection target of the detection step or the state of the secondary battery.
A secondary battery state detection method characterized by having.

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