State detection device and state detection method

Abstract

To provide a state detection device and a state detection method capable of determining a state of a battery even at a timing other than a timing when the state of the battery is stabilized.SOLUTION: The state detection device includes the determination unit 152 that determines the degradation state of the battery 2, the control unit 155 that causes the state detection sensor 8 to operate in the active state at the timing when the internal resistance value of the battery can be measured based on the determination result of the degradation state of the battery and notifies the ECU7 in the vehicle 1 that the state detection sensor 8 is in the active state, the operation control unit 154 that discharges the battery 2, and the detection unit 156 that detects the internal resistance value of the battery 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A technology is known for detecting the state of a secondary battery mounted on a vehicle based on the open-circuit voltage of the battery (see, for example, Patent Document 1). In this technology, if the time elapsed since the last ignition switch was turned off is equal to or longer than a first reference time for the state of the battery to stabilize, the terminal voltage of the battery is used as the open-circuit voltage to estimate the state of the battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6660003 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned Patent Document 1, the battery state is determined at a timing when the battery state is stable, and therefore, there has been a demand for a technology that can determine the battery state at a timing other than when the battery state is stable.

[0005] The present disclosure has been made in consideration of the above, and aims to provide a status detection device and a status detection method that can determine the status of a battery at times other than when the battery status is stable. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the objectives, the status detection device of the present disclosure is a status detection device equipped with a status detection sensor that detects the status of a rechargeable battery, and is equipped with: a determination unit that determines the state of deterioration of the battery when a predetermined signal notified from the outside is received; an output control unit that operates the status detection sensor in an active state when the internal resistance value of the battery becomes measurable based on the determination result of the state of deterioration of the battery and notifies a vehicle control device that the status detection sensor has become active; an operation control unit that discharges the battery; an acquisition unit that acquires the voltage value and current value of the battery detected by the status detection sensor when the battery is discharging; and a detection unit that detects the internal resistance value of the battery based on the voltage value and the current value.

[0007] In addition, the status detection device according to the present disclosure, in the above disclosure, further includes a calculation unit that calculates the SOC and SOH of the battery, wherein the acquisition unit acquires the voltage value and current value of the battery detected by the status detection sensor after the status detection device receives the specified signal, and the calculation unit calculates the SOC and SOH of the battery based on the voltage value and current value of the battery or the internal resistance value of the battery acquired by the acquisition unit after the status detection device receives the specified signal, and the determination unit determines that the battery is in a low state of deterioration if the SOC and SOH are within a specified range, while determining that the battery is in a high state of deterioration if the SOC and SOH are not within the specified range, and the operation control unit discharges the battery if the determination unit determines that the battery is in a low state of deterioration.

[0008] In the state detection device according to the present disclosure, the operation control unit discharges the battery when the battery reaches a standard state.

[0009] In addition, in the status detection device according to the present disclosure, in the above disclosure, the determination unit further determines whether the battery is nearing the end of its life based on the SOH, and the operation control unit discharges the battery when the determination unit determines that the battery is in a severely deteriorated state and that the battery is nearing the end of its life.

[0010] In addition, the status detection device according to the present disclosure, in the above disclosure, further includes an output control unit that outputs a signal indicating that the battery is abnormal when the determination unit determines that the battery is in a severely deteriorated state and that the battery is not nearing the end of its life.

[0011] In addition, the status detection method disclosed herein is a status detection method executed by a status detection device equipped with a status detection sensor that detects the status of a rechargeable battery, and includes an operation step of operating the status detection sensor in an active state when the internal resistance value of the battery becomes measurable, an output control step of notifying a vehicle control device that the status detection sensor has become active, an operation control step of discharging the battery, an acquisition step of acquiring the voltage value and current value of the battery detected by the status detection sensor when the battery is discharging, and a detection step of detecting the internal resistance value of the battery based on the voltage value and the current value. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to obtain an effect that the state of the battery can be determined at a time other than when the state of the battery is stable. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram including a power supply system of a vehicle according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram illustrating a sequence diagram of processing between an ECU and a status detection sensor according to an embodiment of the present disclosure. [Figure 3]FIG. 3 is a flowchart showing an outline of the pulse discharge determination process of FIG. [Figure 4] FIG. 4 is a diagram showing the relationship between the capacity of a battery provided in a vehicle according to an embodiment of the present disclosure and time. DETAILED DESCRIPTION OF THE INVENTION

[0014] A vehicle equipped with a condition detection system according to an embodiment of the present disclosure will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments described below. In addition, in the description of the drawings, identical or corresponding elements are appropriately designated by the same reference numerals, and duplicate explanations will be omitted as appropriate. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of each element may differ from the actual situation. Furthermore, the drawings may include parts with different dimensional relationships and ratios.

[0015] [Vehicle functional configuration] Fig. 1 is a schematic diagram including a power supply system of a vehicle according to a first embodiment of the present disclosure. Vehicle 1 shown in Fig. 1 is a hybrid electric vehicle (HEV), a battery electric vehicle (BEV), a plug-in hybrid vehicle (PHEV), or the like. Vehicle 1 includes a battery 2, an alternator 3, an engine 4, a starter motor 5, a load 6, an electronic control unit (ECU) 7, and a state detection sensor 8.

[0016] The battery 2 is configured using a rechargeable battery containing an electrolyte. For example, the battery 2 is configured using a secondary battery such as a lead-acid battery, a lithium-ion battery, a nickel-cadmium battery, or a nickel-metal hydride battery. The battery 2 is charged by the alternator 3, drives the starter motor 5, and supplies power to a load 6.

[0017] The alternator 3 is driven by the engine 4 to generate AC power, which is converted into DC power by a rectifier circuit and used to charge the battery 2 .

[0018] The engine 4 is configured as a reciprocating engine such as a gasoline engine or a diesel engine, or a rotary engine, etc. The engine 4 is started by a starter motor 5, drives the drive wheels via a transmission, provides propulsive force to the vehicle 1, and drives the alternator 3.

[0019] The starter motor 5 is configured by a DC motor. The starter motor 5 generates a rotational force by using the electric power supplied from the battery 2, and starts the engine 4.

[0020] The load 6 is configured by an electric steering motor, a defogger, a seat heater, an ignition coil, a car audio system, a car navigation system, etc. The load 6 is operated by power supplied from the battery 2.

[0021] The ECU 7 controls each component of the vehicle 1. The ECU 7 is configured using a memory and a processor. The processor is made up of hardware such as a CPU (Central Processing Unit). The memory is a main storage device and is made up of RAM (Random Access Memory) and ROM (Read Only Memory). The ECU 7 loads a program into a working area of ​​the memory (main storage device) and executes it, and by controlling each component through the execution of the program, the ECU 7 realizes functions that meet a predetermined purpose.

[0022] The state detection sensor 8 detects the state of the battery 2 and outputs the detection result to the ECU 7. The state detection sensor 8 includes a voltage sensor 11, a current sensor 12, a temperature sensor 13, and a state detection device .

[0023] The voltage sensor 11 measures the terminal voltage of the battery 2 and outputs a signal indicating the measured voltage to the status detection device 14.

[0024] The current sensor 12 measures the charging current and discharging current of the battery 2, and outputs a signal indicating the measured current to the status detection device .

[0025] The temperature sensor 13 measures the temperature of the electrolyte in the battery 2 or the temperature around the battery 2, and outputs a signal indicating the measured temperature to the status detection device .

[0026] When the battery 2 is discharging, the status detection device 14 acquires signals output from the voltage sensor 11, the current sensor 12, and the temperature sensor 13, and detects the status of the battery 2 based on these acquired signals. The status detection device 14 outputs the detection result of the status of the battery 2 to the ECU 7. Note that in the first embodiment, the status detection device 14, the voltage sensor 11, the current sensor 12, and the temperature sensor 13 are configured as separate sensors, but this is not limited thereto, and some or all of these sensors may be integrated into one status detection device. The status detection device 14 also includes a control unit 15 and a communication interface 16.

[0027] The control unit 15 is composed of hardware such as an ASIC (Application Specific Integrated Circuit) or a DSP (Digital Signal Processor), etc. The control unit 15 has an acquisition unit 151, a determination unit 152, a calculation unit 153, an operation control unit 154, an output control unit 155, and a detection unit 156.

[0028] The acquisition unit 151 acquires the voltage value of the battery 2 detected by the voltage sensor 11, the current value of the battery 2 detected by the current sensor 12, and the internal resistance value of the battery 2.

[0029] When the determination unit 152 receives a predetermined signal notified from the outside, it determines the degradation state of the battery 2. Specifically, the determination unit 152 determines whether the battery 2 is capable of pulse discharge based on the SOH and SOC of the battery 2 calculated by the calculation unit 153.

[0030] The calculation unit 153 calculates the SOH (State of Health) and SOC (State of Charge) of the battery 2 based on the voltage value of the battery 2 detected by the voltage sensor 11, the current value of the battery 2 detected by the current sensor 12, and the internal resistance value of the battery 2, which are acquired by the acquisition unit 151. The calculation unit 153 also calculates the internal resistance value of the battery 2 based on the voltage value of the battery 2 detected by the voltage sensor 11 and the current value of the battery 2 detected by the current sensor 12, which are acquired by the acquisition unit 151.

[0031] The operation control unit 154 performs pulse discharge by the battery 2. The operation control unit 154 activates the status detection sensor 8 when the internal resistance of the battery 2 becomes measurable. The timing when the internal resistance of the battery 2 becomes measurable refers to the timing when the voltage and current values ​​no longer fluctuate over time after the vehicle 1 is parked, eliminating polarization and enabling accurate measurements. The operation control unit 154 also notifies the ECU 7 via the communication interface 16 that the status detection sensor 8 has become active. After activating the status detection sensor 8, the operation control unit 154 activates the predetermined load 6 to discharge the battery 2. The status detection sensor 8 is activated when the voltage sensor 11, current sensor 12, and temperature sensor 13 of the status detection sensor 8 are each capable of measurement. The predetermined load 6 is one of the high-voltage system, engine 4, hazard lights, actuators, etc. of the vehicle 1.

[0032] The output control unit 155 notifies the user of the vehicle 1 that the battery 2 is abnormal via an indicator or speaker of the vehicle 1. The output control unit 155 also notifies the ECU 7 via the communication interface 16 that the state detection sensor 8 has become active. Furthermore, the output control unit 155 notifies the ECU 7 of the state of the battery 2, including the internal resistance value of the battery 2 detected by the detection unit 156.

[0033] The detection unit 156 detects the internal resistance value of the battery 2 based on the voltage value and the current value acquired by the acquisition unit 151 from the voltage sensor 11 and the current sensor 12, respectively.

[0034] The communication interface 16 outputs a signal input from the ECU 7 to the control unit 15, and also outputs a signal output from the control unit 15 to the ECU 7. The communication interface 16 is configured using, for example, a communication module capable of LIN (Local Interconnect Network) communication.

[0035] [Processing between ECU 7 and status detection sensor 8] Next, a description will be given of the processing performed by the ECU 7 and the status detection sensor 8. FIG.

[0036] As shown in FIG. 2, first, the ECU 7 notifies the state detection device 14 of the pulse discharge determination process via the communication interface 16 so that the state detection device 14 can execute the pulse discharge determination process (step S1).

[0037] Subsequently, the state detection device 14 executes a pulse discharge determination process for determining whether or not pulse discharge is possible for determining the state of the battery 2 (step S2).

[0038] [Pulse discharge determination process] FIG. 3 is a flowchart showing an outline of the pulse discharge determination process in step S2 described above.

[0039] As shown in FIG. 3, the acquisition unit 151 acquires the voltage value of the battery 2 detected by the voltage sensor 11, the current value of the battery 2 detected by the current sensor 12, and the internal resistance value of the battery 2 (step S100).

[0040] Next, the calculation unit 153 calculates the SOH (State of Health) and SOC (State of Charge) of the battery 2 based on the voltage value of the battery 2 detected by the voltage sensor 11, the current value of the battery 2 detected by the current sensor 12, and the internal resistance value of the battery 2, which are acquired by the acquisition unit 151 (step S101). Note that the calculation unit 153 may calculate the SOC and SOH of the battery 2 based on a correlation diagram that associates the capacity, age of use, and wear level of the battery 2, which is stored in a memory or the like (not shown), and the voltage value of the battery 2 detected by the voltage sensor 11, the current value of the battery 2 detected by the current sensor 12, and the internal resistance value of the battery 2. Furthermore, the acquisition unit 151 may acquire the SOC and SOH of the battery 2 taking into account the temperature of the battery 2 detected by the temperature sensor 13, etc.

[0041] Next, the determination unit 152 determines whether or not the battery 2 is capable of pulse discharge based on the SOH and SOC of the battery 2 calculated by the calculation unit 153 (step S102). Specifically, the determination unit 152 determines whether or not each of the SOH and SOC of the battery 2 calculated by the calculation unit 153 is within a predetermined range, and if each of the SOH and SOC of the battery 2 is within the predetermined range, the determination unit 152 determines that the battery 2 is capable of pulse discharge, i.e., that the battery 2 is not deteriorated. However, if each of the SOH and SOC of the battery 2 is not within the predetermined range, the determination unit 152 determines that the battery 2 is not deteriorated. That is, if each of the SOH and SOC of the battery 2 is within the predetermined range, the determination unit 152 determines that the deterioration of the battery 2 is small, and if each of the SOH and SOC of the battery 2 is not within the predetermined range, the determination unit 152 determines that the deterioration of the battery 2 is large.

[0042] FIG. 4 is a diagram showing the relationship between the capacity of battery 2 and time. In FIG. 4, the horizontal axis represents time, and the vertical axis represents the capacity of battery 2. Furthermore, curve L1 schematically shows the deterioration state of battery 2. Furthermore, in FIG. 4, region D1 represents a period during which the internal resistance value of battery 2 can be measured accurately, region D2 represents a period during which the state of battery 2 is detected less frequently, and region D3 represents a period immediately before the end of the life of battery 2, during which the state of battery 2 is detected more frequently.

[0043] 4, when the capacity of the battery 2 is high, the internal resistance value of the battery 2 can be accurately detected by the state detection device 14. Therefore, when the SOH and SOC of the battery 2 are each within a predetermined range, the determination unit 152 determines that the deterioration of the battery 2 is small, and when the SOH and SOC of the battery 2 are not each within the predetermined range, the determination unit 152 determines that the deterioration of the battery 2 is large.

[0044] Returning to FIG. 3, the description of step S102 continues. In step S102, if the determination unit 152 determines that the battery 2 is capable of pulse discharge (step S102: Yes), the status detection device 14 proceeds to step S103, which will be described later. On the other hand, if the determination unit 152 determines that the battery 2 is not capable of pulse discharge (step S102: No), the status detection device 14 proceeds to step S108, which will be described later.

[0045] In step S103, the determination unit 152 determines whether or not there is an instruction from the ECU 7 to measure an accurate value. Here, the instruction from the ECU 7 to measure an accurate value is an instruction issued during a period when the SOH of the battery 2 is high and the internal resistance value of the battery 2 can be calculated as an accurate value, as shown in region D1 and curve L1 in FIG. 4. If the determination unit 152 determines that there is an instruction from the ECU 7 to measure an accurate value (step S103: Yes), the status detection device 14 proceeds to step S104, which will be described later. On the other hand, if the determination unit 152 determines that there is no instruction from the ECU 7 to measure an accurate value (step S103: No), the status detection device 14 proceeds to step S106, which will be described later.

[0046] In step S104, the determination unit 152 determines whether the battery 2 is in a standard state based on the temperature of the battery 2 detected by the temperature sensor 13. Specifically, the determination unit 152 determines whether the temperature of the battery 2 detected by the temperature sensor 13 is within a standard state temperature range suitable for accurately calculating the internal resistance value of the battery 2 and whether a predetermined time or more has passed. Here, the standard state is, for example, a state where the temperature is 25°C ± 1°C and four hours or more have passed. Since the temperature in this standard state can be measured at a timing close to the actual measurement, the internal resistance value of the battery 2 can be accurately estimated. If the determination unit 152 determines that the battery 2 is in a standard state (step S104: Yes), the status detection device 14 proceeds to step S106, which will be described later. On the other hand, if the determination unit 152 determines that the battery 2 is not in a standard state (step S104: No), the status detection device 14 proceeds to step S105, which will be described later.

[0047] In step S105, the status detection device 14 waits for a predetermined time, for example, four hours or more. After step S105, the status detection device 14 returns to step S104.

[0048] In step S106, the operation control unit 154 causes the battery 2 to perform pulse discharge.

[0049] Next, the calculation unit 153 calculates the internal resistance value of the battery 2 based on the voltage value of the battery 2 detected by the voltage sensor 11 and the current value of the battery 2 detected by the current sensor 12, both of which are acquired by the acquisition unit 151 (step S107). After step S107, the state detection device 14 returns to the main routine of FIG. 2 and proceeds to step S103.

[0050] In step S108, the determination unit 152 determines whether the battery 2 is nearing the end of its life. Specifically, the determination unit 152 determines whether the battery 2 is nearing the end of its life based on the SOH of the battery 2 calculated in step S101. That is, the determination unit 152 determines whether the battery 2 is nearing the end of its life (whether the battery 2 is getting shorter or shorter) based on the SOH of the battery 2 calculated in step S101. Here, the battery 2 being nearing the end of its life means that the capacity of the battery 2 is 50% or less of the fully charged capacity of the battery 2, and the curvature of the curve L1 indicating the degradation state of the battery 2 is equal to or greater than a certain value, or the number of times the battery 2 has been charged is equal to or greater than a predetermined number. As shown in area D3 and curve L1 in FIG. 4, the determination unit 152 determines whether the battery 2 is nearing the end of its life because the battery 2 is nearing the end of its life and it is necessary to measure the internal resistance of the battery 2 frequently in a short period of time to accurately estimate the SOC. That is, when the life of the battery 2 is nearing its end, the determination unit 152 determines that this is the timing when the internal resistance value of the battery 2 will rise sharply, and that it is necessary to cause the battery 2 to perform pulse discharge and accurately measure the internal resistance value of the battery 2. If the determination unit 152 determines that the life of the battery 2 is near its end (step S108: Yes), the status detection device 14 proceeds to step S106. On the other hand, if the determination unit 152 determines that the life of the battery 2 is not near its end (step S108: No), the status detection device 14 proceeds to step S109, which will be described later.

[0051] In step S109, the output control unit 155 notifies the user of the vehicle 1 via an indicator or speaker of the vehicle 1 that the battery 2 is abnormal. In this case, the output control unit 155 may notify a server linked to the vehicle 1 or a communication device such as the user's mobile terminal that the battery 2 is abnormal via the communication interface 16. This notification is, for example, a display, voice, or text indicating the abnormality in the battery 2 or urging replacement of the battery 2. Furthermore, the operation control unit 154 does not perform pulse discharge by the battery 2. After step S109, the state detection device 14 returns to the main routine of FIG. 2 and proceeds to step S3.

[0052] Returning to FIG. 2, the explanation of step S3 and subsequent steps will be continued. In step S3, the operation control section 154 activates the state detection sensor 8 at the timing when the internal resistance value of the battery 2 becomes measurable.

[0053] Next, the output control unit 155 notifies the ECU 7 via the communication interface 16 that the state detection sensor 8 has entered an active state (step S4). Specifically, the output control unit 155 notifies the ECU 7 of a Wake Up signal. Here, the timing at which the internal resistance value of the battery 2 becomes measurable is the timing at which the voltage value and current value no longer fluctuate over time after the vehicle 1 is parked, and polarization is eliminated, allowing accurate measurement.

[0054] Next, the operation control unit 154 operates a predetermined load 6 (step S5) and discharges the battery 2 (step S6). Here, the predetermined load 6 is one or more of the high-voltage system, engine 4, hazard lamps, actuators, etc. of the vehicle 1. The operation control unit 154 may operate not only one type of load 6 but also a plurality of loads 6. Furthermore, the operation control unit 154 may operate the load 6 as a constant discharge load, a continuously variable load, or an appropriate combination depending on the type and characteristics of the load 6.

[0055] Thereafter, the acquiring unit 151 acquires the voltage value detected by the voltage sensor 11 and the current value detected by the current sensor 12 at predetermined time intervals, for example, at intervals of 1 ms (step S7). In this case, the acquiring unit 151 continuously stores the voltage value and the current value acquired from the voltage sensor 11 and the current sensor 12, respectively, in the memory of the status detection device 14.

[0056] Next, the operation control unit 154 determines whether the number of times that the acquisition unit 151 has acquired the voltage value from the voltage sensor 11 and the current value from the current sensor 12 has reached a predetermined number (step S8). Here, the predetermined number is 5 to 50 times. Of course, the operation control unit 154 may change the number of times depending on the type and combination of the loads 6 to be operated, or may use a measurement time instead of the number of times. If the operation control unit 154 determines that the acquisition unit 151 has acquired the voltage value from the voltage sensor 11 and the current value from the current sensor 12 the predetermined number of times (step S8: Yes), the status detection device 14 proceeds to step S9. On the other hand, if the acquisition unit 151 determines that the number of times that the acquisition unit 151 has acquired the voltage value from the voltage sensor 11 and the current value from the current sensor 12 has not reached the predetermined number of times (step S8: No), the status detection device 14 returns to step S7 described above.

[0057] Thereafter, the detection unit 156 detects the internal resistance value of the battery 2 based on the voltage value and the current value acquired by the acquisition unit 151 from the voltage sensor 11 and the current sensor 12, respectively (step S9).

[0058] Next, the output control unit 155 notifies the ECU 7 of the state of the battery 2, including the internal resistance value of the battery 2, detected by the detection unit 156 (step S10). After step S10, the ECU 7 and the state detection sensor 8 end this process.

[0059] According to the embodiment described above, when the judgment unit 152 receives a predetermined signal notified from the outside, it judges the deterioration state of the battery 2, so that the state of the battery 2 can be judged at times other than when the state of the battery 2 is stable.

[0060] Furthermore, according to one embodiment, if the determination unit 152 determines that the deterioration state of the battery 2 is small, the operation control unit 154 pulse-discharges the battery 2, so that the state of the battery 2 can be detected with high accuracy.

[0061] Furthermore, according to one embodiment, the operation control unit 154 pulse-discharges the battery 2 at the timing when the battery 2 reaches the standard state, so that the state of the battery 2 can be detected with higher accuracy.

[0062] Furthermore, according to one embodiment, when the judgment unit 152 judges that the state of deterioration of the battery 2 is high and that the life of the battery 2 is nearing the end, the operation control unit 154 pulse-discharges the battery 2, so that the state of the battery 2 can be detected with high frequency when the internal resistance value of the battery 2 fluctuates greatly.

[0063] Furthermore, according to one embodiment, when the judgment unit 152 determines that the state of deterioration of the battery 2 is high and that the life of the battery 2 is not nearing the end, the output control unit 155 outputs a message indicating that the battery 2 is abnormal, so that the user can understand that there is an abnormality in the battery 2.

[0064] (Other embodiments) In the status detection system according to an embodiment of the present disclosure, the above-mentioned "unit" can be read as "means" or "circuit," etc. For example, the control unit can be read as control means or control circuit.

[0065] In addition, the program to be executed by the status detection device according to one embodiment of the present disclosure is provided as file data in an installable or executable format recorded on a computer-readable recording medium such as a CD-ROM, a flexible disk (FD), a CD-R, a DVD (Digital Versatile Disk), a USB medium, or a flash memory.

[0066] In the explanation of the flowcharts in this specification, the order of processing between steps is clearly indicated using expressions such as "first," "then," and "continue," but the order of processing required to implement this embodiment is not uniquely determined by these expressions. In other words, the order of processing in the flowcharts described in this specification can be changed within a consistent range.

[0067] Further advantages and modifications will readily occur to those skilled in the art. The invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

[0068] Although some of the embodiments of the present application have been described in detail above with reference to the drawings, these are merely examples, and the present invention can be implemented in other forms that have undergone various modifications and improvements based on the knowledge of those skilled in the art, including the aspects described in the disclosure of the present invention. [Explanation of symbols]

[0069] 1 vehicle 2 Battery 3 Alternator 4 Engine 5 Starter motor 6 Load 7 ECU 8 Status detection sensor 11 Voltage sensor 12 Current Sensor 13 Temperature Sensor 14 Condition detection device 15 Control Unit 16 Communication Interface 151 Acquisition Department 152 Judgment section 153 Calculation Unit 154 Motion control section 155 Output control section 156 Detection unit

Claims

1. A status detection device including a status detection sensor that detects the status of a rechargeable battery, a determination unit that determines a deterioration state of the battery when a predetermined signal notified from an external device is received; an output control unit that activates the state detection sensor when the internal resistance value of the battery becomes measurable based on the result of the determination of the deterioration state of the battery, and notifies a vehicle control device that the state detection sensor has become active; an operation control unit that discharges the battery; an acquisition unit that acquires the voltage value and current value of the battery detected by the state detection sensor when the battery is discharging; a detection unit that detects an internal resistance value of the battery based on the voltage value and the current value; Equipped with Condition detection device.

2. The condition detection device according to claim 1, a calculation unit for calculating an SOC and an SOH of the battery; The acquisition unit After the status detection device receives the predetermined signal, it acquires the voltage value and current value of the battery detected by the status detection sensor, The calculation unit After the state detection device receives the predetermined signal, the state detection device calculates an SOC and an SOH of the battery based on the voltage value and current value of the battery or the internal resistance value of the battery acquired by the acquisition unit; The determination unit When the SOC and SOH are within a predetermined range, it is determined that the deterioration state of the battery is small, and when the SOC and SOH are not within the predetermined range, it is determined that the deterioration state of the battery is large; The operation control unit When the determination unit determines that the deterioration state of the battery is small, the battery is discharged. Condition detection device.

3. The condition detection device according to claim 2, The operation control unit When the battery reaches a standard state, the battery is discharged. Condition detection device.

4. The condition detection device according to claim 3, The determination unit Further determining whether the battery is nearing the end of its life based on the SOH; The operation control unit When the determination unit determines that the battery is in a severely deteriorated state and that the battery is nearing the end of its life, the battery is discharged. Condition detection device.

5. The condition detection device according to claim 4, The output control unit When the determination unit determines that the battery is in a severely deteriorated state and that the battery is not nearing the end of its life, an output is issued indicating that the battery is abnormal. Condition detection device.

6. A status detection method executed by a status detection device including a status detection sensor that detects the status of a rechargeable battery, comprising: an operating step of operating the status detection sensor to an active state when the internal resistance value of the battery becomes measurable; an output control step of notifying a vehicle control device that the state detection sensor has become active; an operation control step of discharging the battery; an acquisition step of acquiring a voltage value and a current value of the battery detected by the state detection sensor while the battery is discharging; a detecting step of detecting an internal resistance value of the battery based on the voltage value and the current value; Including, Condition detection method.

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