High-voltage insulation resistance detection method and device, storage medium and battery management system

Abstract

This invention discloses a high-voltage insulation resistance detection method and device, a storage medium, and a battery management system. The high-voltage insulation resistance detection method for a power battery system in an electric vehicle includes: acquiring the insulation resistance detection value at the current moment, and acquiring the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that; calculating a first resistance value based on the current insulation resistance detection value and the previous insulation resistance calculation value, and calculating a second resistance value based on the current insulation resistance detection value and the insulation resistance calculation value at the moment before that; and adding the first resistance value, the second resistance value, and the insulation resistance calculation value at the previous moment to obtain the insulation resistance calculation value at the current moment. Therefore, this high-voltage insulation resistance detection method for a power battery system in an electric vehicle can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance detection, and improve the detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of resistance detection technology, and in particular to a method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle, a computer-readable storage medium, a battery management system, and a device for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle. Background Technology

[0002] In electric vehicles, the insulation performance of the power battery is a safety concern. A malfunction in this battery can compromise personal safety and is considered a high-level fault. Furthermore, the power battery carries high voltage, making it unsuitable for testing with traditional high-voltage insulation instruments like megohmmeters. Insulation resistance, a crucial indicator of insulation performance, is measured using a hardware-based method as specified in the national standard (GB / T 18384.1-2015). This method involves connecting a known resistor R0 in parallel with the DC positive and negative terminals of the power battery, and then calculating the insulation resistance by collecting the voltage values ​​of R0 before and after its connection to the circuit. Most current BMS (Battery Management System) systems employ this solution. However, to ensure accuracy, many related technologies use a method of removing the maximum and minimum values ​​and averaging the remaining data. This results in redundant software algorithms and drawbacks such as long calculation times, poor real-time performance, and low accuracy. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle, which can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance detection, and simultaneously improve the detection accuracy.

[0004] A second objective of this invention is to provide a computer-readable storage medium.

[0005] The third objective of this invention is to provide a battery management system.

[0006] The fourth objective of this invention is to provide a high-voltage insulation resistance detection device for a power battery system in an electric vehicle.

[0007] To achieve the above objectives, a first aspect of the present invention provides a method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle. The method includes the following steps: obtaining the insulation resistance detection value at the current moment, and obtaining the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that; calculating a first resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the previous moment, and calculating a second resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the moment before that; and adding the first resistance value, the second resistance value, and the insulation resistance calculation value at the previous moment to obtain the insulation resistance calculation value at the current moment.

[0008] The high-voltage insulation resistance detection method of this invention first obtains the insulation resistance detection value at the current moment, and then obtains the calculated insulation resistance values ​​at the previous moment and the moment before that. Next, it calculates a first resistance value based on the current and previous insulation resistance values, and then calculates a second resistance value based on the same values. Finally, it adds the first, second, and previous insulation resistance calculation values ​​to obtain the calculated insulation resistance value at the current moment. Therefore, this high-voltage insulation resistance detection method for the power battery system in electric vehicles can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance detection, and improve the detection accuracy.

[0009] In some examples of the present invention, the calculated value of the insulation resistance at the current moment is calculated according to the following formula: Y(t)=[X(t)-Y(t-1)]*K1+Y(t-1)+[X(t)-Y(t-2)]*K2; where Y(t) is the calculated value of the insulation resistance at the current moment, X(t) is the detected value of the insulation resistance at the current moment, Y(t-1) is the calculated value of the insulation resistance at the previous moment, Y(t-2) is the calculated value of the insulation resistance at the moment before that, K1 and K2 are preset first simulation values ​​and second simulation values, and the first simulation value is greater than the second simulation value.

[0010] In some examples of the present invention, the first simulation value is 0.25-0.4, and the second simulation value is 0.05-0.2.

[0011] In some examples of the present invention, obtaining the insulation resistance detection value at the current moment includes: obtaining the measured values ​​of the positive bus voltage and the negative bus voltage of the power battery system, and obtaining the measured value of the negative bus voltage after connecting the insulation resistance in parallel between the positive bus and the negative bus of the power battery system; calculating the insulation resistance detection value at the current moment based on the measured values ​​of the positive bus voltage and the negative bus voltage of the power battery system and the measured value of the negative bus voltage after connecting the insulation resistance in parallel between the positive bus and the negative bus of the power battery system.

[0012] In some examples of the present invention, the insulation resistance detection value at the current moment is calculated according to the following formula: X(t)=Ro*(1+V1' / V1)((V1-V2) / V2); where X(t) is the insulation resistance detection value at the current moment, Ro is the resistance value of the insulation resistance, V1' is the measured value of the positive bus voltage of the power battery system, V1 is the measured value of the negative bus voltage of the power battery system, and V2 is the measured value of the negative bus voltage after the insulation resistance is connected in parallel between the positive bus and the negative bus of the power battery system.

[0013] In some examples of the present invention, during the initial calculation, three sets of insulation resistance detection values ​​are obtained, and the insulation resistance calculation value of the previous moment and the insulation resistance calculation value of the moment before that moment are obtained based on the three sets of insulation resistance detection values.

[0014] In some examples of this invention, a data stack is used to obtain three sets of insulation resistance test values.

[0015] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium storing a high-voltage insulation resistance detection program for a power battery system in an electric vehicle. When executed by a processor, the high-voltage insulation resistance detection program for a power battery system in an electric vehicle implements the high-voltage insulation resistance detection method for a power battery system in an electric vehicle as described in the above embodiments.

[0016] According to the computer-readable storage medium of the present invention, the processor executes a high-voltage insulation resistance detection program for the power battery system in an electric vehicle stored on the storage medium, which can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance, and improve the detection accuracy.

[0017] To achieve the above objectives, a third aspect of the present invention provides a battery management system, which includes a memory, a processor, and a high-voltage insulation resistance detection program for a power battery system in an electric vehicle stored in the memory and executable on the processor. When the processor executes the high-voltage insulation resistance detection program, it implements the high-voltage insulation resistance detection method for a power battery system in an electric vehicle as described in the above embodiments.

[0018] The battery management system of this invention includes a memory and a processor. The processor executes a high-voltage insulation resistance detection program for the power battery system in an electric vehicle stored in the memory, which can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance, and improve the detection accuracy.

[0019] To achieve the above objectives, a fourth aspect of the present invention provides a high-voltage insulation resistance detection device for a power battery system in an electric vehicle. The device includes: a first acquisition module for acquiring the insulation resistance detection value at the current moment; a second acquisition module for acquiring the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that; and a calculation module for calculating a first resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the previous moment, calculating a second resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the moment before that, and adding the first resistance value, the second resistance value, and the insulation resistance calculation value at the previous moment to obtain the insulation resistance calculation value at the current moment.

[0020] The high-voltage insulation resistance detection device for the power battery system in an electric vehicle according to this invention includes a first acquisition module, a second acquisition module, and a calculation module. The first acquisition module acquires the insulation resistance detection value at the current moment, and the second acquisition module acquires the calculated insulation resistance values ​​at the previous moment and the moment before that. Then, the calculation module calculates a first resistance value based on the current and previous insulation resistance values, and calculates a second resistance value based on the same values. Finally, the first, second, and previous insulation resistance values ​​are added together to obtain the calculated insulation resistance value at the current moment. Therefore, this high-voltage insulation resistance detection device for the power battery system in an electric vehicle can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance detection, and improve detection accuracy.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a flowchart of a high-voltage insulation resistance detection method for a power battery system in an electric vehicle according to an embodiment of the present invention;

[0023] Figure 2 This is a flowchart of a high-voltage insulation resistance detection method for a power battery system in an electric vehicle according to another embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of high-voltage insulation resistance detection in a power battery system of an electric vehicle according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the signal waveforms before and after the processing of the fluctuation input signal according to a specific embodiment of the present invention;

[0026] Figure 5 This is a structural block diagram of the battery management system according to an embodiment of the present invention;

[0027] Figure 6 This is a structural block diagram of a high-voltage insulation resistance detection device for a power battery system in an electric vehicle, according to an embodiment of the present invention. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The following description, with reference to the accompanying drawings, describes a high-voltage insulation resistance detection method and apparatus, a storage medium, and a battery management system according to embodiments of the present invention.

[0030] Figure 1 This is a flowchart of a high-voltage insulation resistance detection method for a power battery system in an electric vehicle according to an embodiment of the present invention.

[0031] like Figure 1 As shown, the high-voltage insulation resistance detection method for the power battery system in an electric vehicle according to an embodiment of the present invention includes the following steps:

[0032] S10, obtain the insulation resistance detection value at the current moment, and obtain the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that.

[0033] Specifically, this embodiment processes the resistance value calculated using the international standard GB / T 18384.1-2015 calculation method. In other words, the resistance value calculated using the international standard GB / T 18384.1-2015 calculation method is used as the insulation resistance detection value at the current moment.

[0034] More specifically, in one embodiment of the invention, such as Figure 2 As shown, obtaining the insulation resistance detection value at the current moment includes the following steps:

[0035] S201, acquire the measured values ​​of the positive bus voltage and negative bus voltage of the power battery system, and acquire the measured value of the negative bus voltage after connecting the parallel insulation resistance between the positive and negative bus of the power battery system. S202, calculate the current insulation resistance detection value based on the measured values ​​of the positive and negative bus voltages of the power battery system, and the measured value of the negative bus voltage after connecting the parallel insulation resistance between the positive and negative bus of the power battery system.

[0036] In this embodiment, the measured values ​​of the positive bus voltage, negative bus voltage, and negative bus voltage after applying a parallel insulation resistance between the positive and negative buses of the power battery system are first obtained. After obtaining these voltage measurements, the insulation resistance detection value at the current moment can be calculated using a calculation unit. It should be noted that the calculation method performed by this calculation unit is set according to the international standard GB / T 18384.1-2015. This ensures that the measured values ​​of the positive bus voltage, negative bus voltage, and negative bus voltage after applying a parallel insulation resistance between the positive and negative buses of the power battery system, after passing through the calculation unit, yield an insulation resistance detection value calculated according to the method in international standard GB / T 18384.1-2015.

[0037] In this embodiment, the insulation resistance detection value at the current moment is calculated according to the following formula: X(t)=Ro*(1+V1' / V1)((V1-V2) / V2), where X(t) is the insulation resistance detection value at the current moment, Ro is the resistance value of the insulation resistance, V1' is the measured value of the positive bus voltage of the power battery system, V1 is the measured value of the negative bus voltage of the power battery system, and V2 is the measured value of the negative bus voltage after the insulation resistance is connected in parallel between the positive bus and the negative bus of the power battery system.

[0038] Specifically, the insulation resistance is connected in parallel between the positive busbar and the negative busbar, such as... Figure 3 As shown, V1' is the measured value of the positive bus voltage of the power battery system, V1 is the measured value of the negative bus voltage of the power battery system, and V2 is the measured value of the negative bus voltage after the insulation resistance is connected in parallel between the positive and negative bus of the power battery system. The insulation resistance detection value X(t) at the current moment can be obtained by calculating the three values ​​through the calculation unit and then through unit K. The formula for the calculation method performed by the calculation unit is: X(t)=Ro*(1+V1' / V1)((V1-V2) / V2).

[0039] Optionally, in this embodiment, unit K is a selection switch unit, signal C is an insulation resistance detection prohibition bit signal, and signal C is 0 by default. When selection switch unit K is connected to signal C, it indicates that the filter is allowed to process the insulation resistance. Signal D is the maximum value signal. When selection switch unit K is connected to signal D, it indicates that the filter is prohibited from processing the insulation resistance. It can be understood that when voltage measurement values ​​V1', V1, and V2 are not measured or are not ready, insulation resistance detection can be prohibited by signal D to prevent the current insulation resistance detection value from being inaccurate, which would lead to errors in subsequent detections.

[0040] After obtaining the insulation resistance detection value at the current moment in step S10, the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that moment can be obtained through the delay module.

[0041] like Figure 3 As shown, after the insulation resistance detection value X(t) at the current moment is detected, the insulation resistance detection value X(t) can be processed by the delay module to obtain the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that.

[0042] In addition, in some embodiments, during the initial calculation, three sets of insulation resistance detection values ​​are obtained, and the insulation resistance calculation value of the previous moment and the insulation resistance calculation value of the moment before that moment are obtained based on the three sets of insulation resistance detection values.

[0043] Specifically, such as Figure 3 As shown, when performing the initial calculation using the measured values ​​V1', V1, and V2 of the negative bus voltage after applying the parallel insulation resistance between the positive and negative bus terminals of the power battery system, three sets of insulation resistance detection values ​​can be calculated first. These values ​​can then be categorized into the calculated insulation resistance value from the previous moment and the calculated insulation resistance value from the moment before that. It's understandable that since the calculated insulation resistance values ​​from the previous moment and the moment before that are both zero during the initial calculation, they should be filtered out. After obtaining the three sets of insulation resistance detection values, the calculated insulation resistance values ​​from the previous moment and the moment before that will each have corresponding accurate detection values, which can then be used directly.

[0044] In this embodiment, three sets of insulation resistance test values ​​are obtained using a data stack method. This embodiment only requires obtaining three sets of insulation resistance test values ​​to perform the test, greatly improving the speed of insulation resistance detection.

[0045] S20, calculate the first resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the previous moment, and calculate the second resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the moment before that.

[0046] Specifically, after obtaining the current insulation resistance detection value and the previous insulation resistance calculation value, a first resistance value can be calculated based on these two values. More specifically, the current insulation resistance detection value can be subtracted from the previous insulation resistance calculation value to obtain a difference, which is then multiplied by a first simulation value to obtain the first resistance value. After obtaining the current insulation resistance detection value and the insulation resistance calculation value from the time before that, a second resistance value can be calculated based on these two values. More specifically, the current insulation resistance detection value can be subtracted from the time before that to obtain another difference, which is then multiplied by a second simulation value to obtain the second resistance value.

[0047] S30: Add the first resistance value, the second resistance value, and the insulation resistance calculation value from the previous moment to obtain the insulation resistance calculation value at the current moment.

[0048] Specifically, after obtaining the first resistance value and the second resistance value, the first resistance value, the second resistance value, and the insulation resistance calculated at the previous moment are added together to obtain the insulation resistance value at the current moment. More specifically, the insulation resistance calculated at the current moment is calculated according to the following formula: Y(t)=[X(t)-Y(t-1)]*K1+Y(t-1)+[X(t)-Y(t-2)]*K2; where Y(t) is the insulation resistance calculated at the current moment, X(t) is the insulation resistance detected at the current moment, Y(t-1) is the insulation resistance calculated at the previous moment, Y(t-2) is the insulation resistance calculated at the moment before that, and K1 and K2 are the preset first simulation value and second simulation value, and the first simulation value is greater than the second simulation value.

[0049] In this embodiment, the first simulation value is 0.25-0.4, and the second simulation value is 0.05-0.2. Preferably, the first simulation value is 0.3, and the second simulation value is 0.1.

[0050] In one specific embodiment of the present invention, the accuracy of the insulation resistance detection value in this embodiment can be detected by adding a fluctuating input signal to simulate an interference signal.

[0051] Specifically, firstly, the measured values ​​of the positive bus voltage V1', negative bus voltage V1, and negative bus voltage V2 after connecting the parallel insulation resistance between the positive and negative bus of the power battery system can be simulated using Simulink. Then, a fluctuation input signal is added. This fluctuation input signal can be bidirectional (positive and negative), with an amplitude less than ±2 volts and a duration of approximately 10 milliseconds. Figure 4 As shown in the experiment, when the resistance detected by the high voltage insulation resistance detection method of the power battery system in the electric vehicle of the present invention is processed, the resulting fluctuating input signal is significantly more convergent than the fluctuating input signal before processing, so the impact on the power battery system is also smaller.

[0052] In summary, the high-voltage insulation resistance detection method for the power battery system in electric vehicles of this embodiment can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance, and improve the detection accuracy.

[0053] Furthermore, the present invention proposes a computer-readable storage medium storing a high-voltage insulation resistance detection program for a power battery system in an electric vehicle. When executed by a processor, the high-voltage insulation resistance detection program for a power battery system in an electric vehicle implements the high-voltage insulation resistance detection method for a power battery system in an electric vehicle as described in the above embodiments.

[0054] The computer-readable storage medium of this invention executes a high-voltage insulation resistance detection program for the power battery system in an electric vehicle stored thereon via a processor. This improves the detection speed of the high-voltage insulation resistance of the power battery system, ensures the real-time performance of the high-voltage insulation resistance, and enhances the detection accuracy.

[0055] Figure 5 This is a structural block diagram of the battery management system according to an embodiment of the present invention.

[0056] Furthermore, such as Figure 5 As shown, the present invention proposes a battery management system 100, which includes a memory 101, a processor 102, and a high-voltage insulation resistance detection program for a power battery system in an electric vehicle stored in the memory 101 and executable on the processor 102. When the processor 102 executes the high-voltage insulation resistance detection program, it implements the high-voltage insulation resistance detection method for a power battery system in an electric vehicle as described in the above embodiments.

[0057] The battery management system of this invention includes a memory and a processor. The processor executes a high-voltage insulation resistance detection program for the power battery system in an electric vehicle stored in the memory, which can improve the detection speed of the high-voltage insulation resistance of the power battery system, ensure the real-time performance of the high-voltage insulation resistance, and improve the detection accuracy.

[0058] Figure 6 This is a structural block diagram of a high-voltage insulation resistance detection device for a power battery system in an electric vehicle, according to an embodiment of the present invention.

[0059] Furthermore, such as Figure 6 As shown, the present invention proposes a high-voltage insulation resistance detection device 10 for a power battery system in an electric vehicle. The detection device 10 includes a first acquisition module 11, a second acquisition module 12, and a calculation module 13.

[0060] The first acquisition module 11 is used to acquire the insulation resistance detection value at the current moment; the second acquisition module 12 is used to acquire the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that; the calculation module 13 is used to calculate the first resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the previous moment, and calculate the second resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the moment before that, and add the first resistance value, the second resistance value and the insulation resistance calculation value at the previous moment to obtain the insulation resistance calculation value at the current moment.

[0061] Specifically, this embodiment processes the resistance value calculated using the method of international standard GB / T 18384.1-2015. In other words, the resistance value calculated using the method of international standard GB / T 18384.1-2015 is used as the insulation resistance detection value at the current moment. The insulation resistance detection value at the current moment can be detected by the first acquisition module 11, then processed by the delay module, and then the insulation resistance calculation value at the previous moment and the time before that moment can be obtained by the second acquisition module 12.

[0062] After obtaining the current insulation resistance detection value and the previous insulation resistance calculation value, the calculation module 13 can calculate the first resistance value based on these two insulation resistance values. More specifically, the current insulation resistance detection value can be subtracted from the previous insulation resistance calculation value to obtain a difference, and then this difference can be multiplied by the first simulation value to obtain the first resistance value. After obtaining the current insulation resistance detection value and the insulation resistance calculation value from the time before that, the calculation module 13 can calculate the second resistance value based on these two insulation resistance values. More specifically, the current insulation resistance detection value can be subtracted from the time before that to obtain another difference, and then this difference can be multiplied by the second simulation value to obtain the second resistance value. After obtaining the first resistance value and the second resistance value, the first resistance value, the second resistance value, and the previous insulation resistance calculation value are added together to obtain the current insulation resistance value.

[0063] In some examples of the present invention, the calculated value of the insulation resistance at the current moment is calculated according to the following formula: Y(t)=[X(t)-Y(t-1)]*K1+Y(t-1)+[X(t)-Y(t-2)]*K2; where Y(t) is the calculated value of the insulation resistance at the current moment, X(t) is the detected value of the insulation resistance at the current moment, Y(t-1) is the calculated value of the insulation resistance at the previous moment, Y(t-2) is the calculated value of the insulation resistance at the moment before that, K1 and K2 are preset first simulation value and second simulation value, and the first simulation value is greater than the second simulation value.

[0064] In some examples of the present invention, the first simulation value is 0.25-0.4, and the second simulation value is 0.05-0.2.

[0065] In some examples of the present invention, the first acquisition module acquires the insulation resistance detection value at the current moment, including: acquiring the measured value of the positive bus voltage and the measured value of the negative bus voltage of the power battery system, and acquiring the measured value of the negative bus voltage after the insulation resistance is connected in parallel between the positive bus and the negative bus of the power battery system; calculating the insulation resistance detection value at the current moment based on the measured value of the positive bus voltage and the measured value of the negative bus voltage of the power battery system and the measured value of the negative bus voltage after the insulation resistance is connected in parallel between the positive bus and the negative bus of the power battery system.

[0066] In some examples of the present invention, the calculation module calculates the insulation resistance detection value at the current moment according to the following formula: X(t)=Ro*(1+V1' / V1)((V1-V2) / V2); where X(t) is the insulation resistance detection value at the current moment, Ro is the resistance value of the insulation resistance, V1' is the measured value of the positive bus voltage of the power battery system, V1 is the measured value of the negative bus voltage of the power battery system, and V2 is the measured value of the negative bus voltage after the insulation resistance is connected in parallel between the positive bus and the negative bus of the power battery system.

[0067] In some examples of the present invention, during the initial calculation, the first acquisition module acquires three sets of insulation resistance detection values, and uses the second acquisition module to acquire the insulation resistance calculation value of the previous moment and the insulation resistance calculation value of the moment before that based on the three sets of insulation resistance detection values.

[0068] In some examples of this invention, a data stack is used to obtain three sets of insulation resistance test values.

[0069] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0070] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0071] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle, characterized in that, include: Obtain the insulation resistance detection value at the current moment, and obtain the insulation resistance calculation value at the previous moment and the insulation resistance calculation value at the moment before that; A first resistance value is calculated based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the previous moment, and a second resistance value is calculated based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the moment before that. The first resistance value, the second resistance value, and the calculated insulation resistance value at the previous moment are added together to obtain the calculated insulation resistance value at the current moment. The insulation resistance value at the current moment is calculated according to the following formula: Y(t)=[X(t)-Y(t-1)]*K1+Y(t-1)+ [X(t)-Y(t-2)]*K2 Wherein, Y(t) is the calculated value of insulation resistance at the current moment, X(t) is the detected value of insulation resistance at the current moment, Y(t-1) is the calculated value of insulation resistance at the previous moment, Y(t-2) is the calculated value of insulation resistance at the moment before that, K1 and K2 are preset first simulation value and second simulation value, and the first simulation value is greater than the second simulation value.

2. The method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle as described in claim 1, characterized in that, The first simulation value is 0.25-0.4, and the second simulation value is 0.05-0.

2.

3. The method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle as described in any one of claims 1-2, characterized in that, Obtain the insulation resistance detection value at the current moment, including: Obtain the measured values ​​of the positive bus voltage and the negative bus voltage of the power battery system, and obtain the measured value of the negative bus voltage after connecting the parallel insulation resistance between the positive bus and the negative bus of the power battery system. The insulation resistance detection value at the current moment is calculated based on the measured values ​​of the positive bus voltage and negative bus voltage of the power battery system, as well as the measured value of the negative bus voltage after connecting the insulation resistance in parallel between the positive and negative bus of the power battery system.

4. The method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle as described in claim 3, characterized in that, The insulation resistance value at the current moment is calculated using the following formula: X(t)= Ro*(1+V1' / V1)((V1-V2) / V2) Where X(t) is the insulation resistance detection value at the current moment, Ro is the resistance value of the insulation resistance, V1' is the positive bus voltage measurement value of the power battery system, V1 is the negative bus voltage measurement value of the power battery system, and V2 is the negative bus voltage measurement value after the insulation resistance is connected in parallel between the positive bus and the negative bus of the power battery system.

5. The method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle as described in any one of claims 1-2, characterized in that, During the initial calculation, three sets of insulation resistance detection values ​​are obtained, and the insulation resistance calculation values ​​of the previous moment and the moment before that are obtained based on the three sets of insulation resistance detection values.

6. The method for detecting the high-voltage insulation resistance of a power battery system in an electric vehicle as described in claim 5, characterized in that, Three sets of insulation resistance test values ​​were obtained using a data stack method.

7. A computer-readable storage medium, characterized in that, It stores a high-voltage insulation resistance detection program for the power battery system in an electric vehicle. When the processor executes the high-voltage insulation resistance detection program for the power battery system in an electric vehicle, it implements the high-voltage insulation resistance detection method for the power battery system in an electric vehicle as described in any one of claims 1-6.

8. A battery management system, characterized in that, The invention includes a memory, a processor, and a high-voltage insulation resistance detection program for a power battery system in an electric vehicle, which is stored in the memory and can run on the processor. When the processor executes the high-voltage insulation resistance detection program, it implements the high-voltage insulation resistance detection method for a power battery system in an electric vehicle as described in any one of claims 1-6.

9. A high-voltage insulation resistance testing device for a power battery system in an electric vehicle, characterized in that, include: The first acquisition module is used to acquire the insulation resistance detection value at the current moment; The second acquisition module is used to acquire the calculated value of insulation resistance at the previous moment and the calculated value of insulation resistance at the moment before that. The calculation module is used to calculate a first resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the previous moment, and to calculate a second resistance value based on the insulation resistance detection value at the current moment and the insulation resistance calculation value at the moment before that, and to add the first resistance value, the second resistance value and the insulation resistance calculation value at the previous moment to obtain the insulation resistance calculation value at the current moment. The insulation resistance value at the current moment is calculated according to the following formula: Y(t)=[X(t)-Y(t-1)]*K1+Y(t-1)+ [X(t)-Y(t-2)]*K2 Wherein, Y(t) is the calculated value of insulation resistance at the current moment, X(t) is the detected value of insulation resistance at the current moment, Y(t-1) is the calculated value of insulation resistance at the previous moment, Y(t-2) is the calculated value of insulation resistance at the moment before that, K1 and K2 are preset first simulation value and second simulation value, and the first simulation value is greater than the second simulation value.

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