State detection method and device of connector

Abstract

The invention relates to the technical field of connector detection, and provides a state detection method and device of a connector. The method comprises the following steps: acquiring a first voltage of a high-voltage input end of any high-voltage component connected with a battery pack in a no-load state and a second voltage of the high-voltage input end of the high-voltage component in a load state; according to the comparison result of the first voltage and the battery voltage of the battery pack and the comparison result of the second voltage and the battery voltage, the electrical connection state of a connector for connecting the high-voltage component and the battery pack is obtained. According to the state detection method of the connector provided by the embodiment of the invention, the accuracy of state detection of the connector can be improved.

Description

Technical Field

[0001] This application relates to the field of connector testing technology, specifically to a connector status detection method and apparatus. Background Technology

[0002] Power equipment that uses battery packs as a power source is usually equipped with high-voltage components. The high-voltage components are connected to the battery pack via connectors. If the connectors are loose or aged, it will affect the safety of the power equipment. Therefore, it is necessary to perform condition checks on the connectors.

[0003] In related technologies, the method for detecting the status of connectors involves connecting the interlocking interfaces of various high-voltage components in series with the controller to form a detection loop, through which the status of the connectors is detected. However, this detection method can only determine whether a connector is abnormal, but cannot determine the specific connection status of a particular connector, thus affecting the accuracy of connector status detection. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in related technologies. To this end, this application proposes a connector state detection method that can improve the accuracy of connector state detection.

[0005] The connector status detection method according to the first aspect of this application includes: Obtain the first voltage at the high voltage input terminal of any high voltage component connected to the battery pack in an unloaded state, and the second voltage at the high voltage input terminal of the high voltage component in a loaded state; Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained.

[0006] By acquiring the first voltage at the high-voltage input terminal of any high-voltage component connected to the battery pack under no-load conditions and the second voltage at the high-voltage input terminal under load conditions, the electrical connection status of the connector connecting the high-voltage component and the battery pack can be obtained based on the comparison results of the first voltage and the battery voltage of the battery pack, as well as the comparison results of the second voltage and the battery voltage. Furthermore, by acquiring and comparing the relationship between the input voltage and battery voltage of the same high-voltage component under both no-load and load conditions, the dynamic voltage drop generated on the connector connected to the high-voltage component is measured. The no-load voltage reflects the static connection continuity, and the load voltage reflects the true state of the dynamic connection resistance. This allows for precise identification of which connector is malfunctioning and, more importantly, a precise determination of whether the connector is in an ideal low-resistance connection state, an aging state due to increased resistance caused by contact surface deterioration, or a loose connection state, thereby improving the accuracy of connector status detection.

[0007] According to one embodiment of this application, obtaining a first voltage at the high-voltage input terminal of any high-voltage component connected to the battery pack in an unloaded state, and a second voltage at the high-voltage input terminal of the high-voltage component in a loaded state, includes: In response to a trigger signal instructing the high-voltage component to switch from the no-load state to the loaded state, the first voltage before the switch and the second voltage after the switch are acquired.

[0008] According to one embodiment of this application, based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage of the battery pack, the electrical connection state of the connector connecting the high-voltage component and the battery pack is obtained, including: If the voltage difference between the first voltage and the battery voltage is less than a first threshold, and among the second voltages sampled multiple times within a preset continuous period, at least one second voltage has a voltage drop between it and the battery voltage that exceeds a second threshold, and the fluctuation amplitude of each second voltage within the preset continuous period exceeds a preset amplitude, then the electrical connection state of the connector is determined to be a loose connection state. Wherein, the first threshold is less than the second threshold.

[0009] According to one embodiment of this application, the first threshold is determined based on the electrical characteristic parameters of the connector in a normal connection state, and the second threshold is determined based on the electrical characteristic parameters of the connector in a loose connection state.

[0010] According to one embodiment of this application, based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage of the battery pack, the electrical connection state of the connector connecting the high-voltage component and the battery pack is obtained, including: By determining that the first voltage is greater than zero and less than the battery voltage, and the second voltage is less than the battery voltage, the electrical connection state of the connector is determined to be an aging state.

[0011] According to one embodiment of this application, based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage of the battery pack, the electrical connection state of the connector connecting the high-voltage component and the battery pack is obtained, including: If the voltage difference between the first voltage and the battery voltage is less than a third threshold, and the second voltage sampled multiple times within a preset continuous period is consistently lower than the battery voltage and shows a downward trend, then the electrical connection state of the connector is determined to be an aging state. The third threshold is determined based on the electrical characteristic parameters of the connector in its normal connection state.

[0012] According to one embodiment of this application, it also includes: If both the first voltage and the second voltage are determined to be less than or equal to the fourth threshold, the electrical connection state of the connector is determined to be an open circuit fault state. The fourth threshold is determined based on the electrical characteristic parameters of the connector under an open-circuit fault condition.

[0013] A connector status detection device according to a second aspect embodiment of this application includes: The voltage acquisition module is used to acquire the first voltage of the high voltage input terminal of any high voltage component connected to the battery pack in the no-load state, and the second voltage of the high voltage input terminal of the high voltage component in the load state. The interlock detection module is used to determine the electrical connection status of the connector connecting the high-voltage component and the battery pack based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage.

[0014] An electronic device according to a third aspect of this application includes a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the connector status detection method described in any of the above embodiments.

[0015] A computer-readable storage medium according to a fourth aspect of this application stores a computer program thereon, which, when executed by a processor, implements the connector status detection method described in any of the above embodiments.

[0016] A vehicle according to a fifth aspect of this application includes a battery pack, at least one high-voltage component, and an electronic device according to a third aspect of this application; each of the high-voltage components is connected to the battery pack via a corresponding connector, and each of the high-voltage components is communicatively connected to the electronic device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram illustrating the application environment of the connector status detection method provided in this embodiment of the application; Figure 2 A first flowchart illustrating the connector status detection method provided in this application embodiment; Figure 3 This is a second flowchart illustrating the connector status detection method provided in an embodiment of this application. Figure 4 This is a schematic diagram of the connector status detection device provided in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), and similarly, "multiple items" refers to two or more (including two).

[0024] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0025] The connector status detection method and apparatus provided in this application will be described in detail and explained below through several specific embodiments.

[0026] Power equipment using battery packs as a power source is typically equipped with high-voltage components. These components are usually connected to the battery pack via connectors, such as high-voltage connectors. If these connectors experience problems like loose connections or aging, the safety of the power equipment will be affected. Therefore, it is necessary to perform condition monitoring on the connectors. Power equipment can refer to an electrified platform that uses a battery pack as an energy storage unit and converts electrical energy into mechanical energy through a high-voltage electrical architecture to drive the equipment's movement or operation. Examples include pure electric vehicles, plug-in hybrid electric vehicles, electric construction machinery, electric ships, and electric aircraft. High-voltage components can refer to various functional electrical devices connected to the battery pack's output bus, whose operating voltage is typically higher than the human body's safe voltage. These devices receive high-voltage direct current to drive or perform specific functions. Examples include motor controllers, on-board chargers (OBCs), DC / DC converters, electric air conditioning compressors, and PTC heaters. Their high-voltage input terminals are connected to the battery pack via high-voltage wiring harnesses and connectors. Connectors can refer to specialized electromechanical components used to achieve separable connections in high-voltage electrical circuits, connecting the battery pack to various high-voltage components. Connectors typically consist of a male terminal (plug) and a female terminal (socket), and often integrate additional low-voltage signal terminals to form the connector's status detection circuit.

[0027] In related technologies, the method for detecting the status of connectors involves connecting the interlocking interfaces of various high-voltage components in series with the controller to form a detection loop, through which the status of the connectors is detected. However, this detection method can only determine whether a connector is abnormal, but cannot determine the specific connection status of a particular connector, thus affecting the accuracy of connector status detection.

[0028] Therefore, it is possible to determine whether the connection status of the connector corresponding to the high-voltage component is abnormal by detecting whether the voltage at the high-voltage input terminal of the high-voltage component is zero or within a preset voltage range under load. However, this method can only determine whether the connection status of the connector is abnormal, but cannot determine the specific type of abnormality, thus still affecting the accuracy of connector status detection.

[0029] Therefore, this application embodiment obtains the first voltage of the high-voltage input terminal of any high-voltage component connected to the battery pack under no-load conditions and the second voltage of the high-voltage input terminal of the high-voltage component under load conditions. Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained. By obtaining and comparing the relationship between the input voltage and the battery voltage of the same high-voltage component under no-load and load conditions, the dynamic voltage drop generated on the connector connected to the high-voltage component is measured. The no-load voltage reflects the static connection continuity, and the load voltage reflects the true state of the dynamic connection resistance. This allows for precise location of which connector is malfunctioning and accurate determination of whether the connector is in an ideal low-resistance connection state, an aging state due to increased resistance caused by contact surface deterioration, or a loose connection state, thereby improving the accuracy of connector status detection.

[0030] The application environment of the connector status detection method provided in this embodiment can be as follows: Figure 1 As shown, the system includes a battery pack 10, at least one high-voltage component 20, and electronic equipment 30. Each high-voltage component 20 is connected to the battery pack 40 via a corresponding connector 40, such as connecting to the output bus of the battery pack 40 via a corresponding connector 40. The battery pack 10 and each high-voltage component 20 are communicatively connected to the electronic equipment 30 to report their voltage data. The electronic equipment 30 can be a vehicle controller, domain controller, ECU (Electronic Control Unit), etc., used for connector status detection. The solution provided in this application will be described in detail below with reference to the corresponding flowchart.

[0031] According to some embodiments of this application, this application provides a connector status detection method, which can be applied to, for example... Figure 1 The electronic device 30 shown is used to detect the status of the connector. For example... Figure 2 As shown, the connector status detection method provided in this embodiment includes: S101, obtain the first voltage of the high voltage input terminal of any high voltage component connected to the battery pack in the no-load state, and the second voltage of the high voltage input terminal of the high voltage component in the load state; S102, based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage, the electrical connection state of the connector connecting the high voltage component and the battery pack is obtained.

[0032] The no-load state of high-voltage components refers to the state in which the high-voltage components are energized but do not perform their core driving functions, such as standby or light-load state. At this time, the current flowing through its high-voltage input terminal and corresponding connector is only a negligible static current or leakage current, or there is no current.

[0033] The load-bearing state of a high-voltage component refers to the state in which the high-voltage component is powered on and performs its core driving function. At this time, the rated or near-rated operating current at its high-voltage input terminal is sufficient to generate a significant and measurable ohmic voltage drop across the contact resistance of the connector connected to the high-voltage component.

[0034] The high-voltage input terminal of a high-voltage component refers to the physical interface, such as a terminal block or connector port, used to receive high-voltage DC power from the battery pack. Its voltage value is directly affected by the connection status of the connectors to which it is connected.

[0035] In some embodiments, when the high-voltage component is in an unloaded state, the voltage at its high-voltage input terminal can be acquired as a first voltage, and when the high-voltage component is under load, the voltage at its high-voltage input terminal can be acquired as a second voltage. The first and second voltages can be acquired in a single sampling or at a preset sampling frequency. For example, when the high-voltage component is under load, the voltage at its high-voltage input terminal can be sampled at a preset sampling frequency, such as 1 second, to obtain multiple second voltages. Alternatively, since the first voltage is acquired when the high-voltage component is in an unloaded state, the current flowing through the high-voltage input terminal is only a negligible static current or leakage current, making the first voltage relatively stable. Therefore, when the high-voltage component is in an unloaded state, the voltage at its high-voltage input terminal can be acquired in a single sampling to obtain the first voltage, reducing data redundancy; when the high-voltage component is under load, the voltage at its high-voltage input terminal can be acquired at a preset sampling frequency to obtain multiple second voltages.

[0036] In some embodiments, the collected first voltage is compared with the battery voltage of the battery pack to obtain a comparison result of the first voltage and the battery voltage; the collected second voltage can also be compared with the battery voltage of the battery pack to obtain a comparison result of the second voltage and the battery voltage. If there are multiple first voltages, the first voltage with the timestamp closest to the current time can be compared with the battery voltage to obtain a comparison result of the first voltage and the battery voltage; the same applies to the second voltage.

[0037] When a connector for a high-voltage component is loosely connected, it can be equivalent to the presence of a thin wire. Because of the loose connection, there is still contact, and the voltage of the high-voltage component connected to this connector is usually normal under no-load conditions. However, when the high-voltage component is under load, the entire loop is energized. The poor current-carrying capacity of the loose connector will generate a large impedance, resulting in a significant voltage drop.

[0038] When a connector ages, it becomes equivalent to a stable contact resistance. At this time, the voltage of the high-voltage component connected to the connector is usually slightly lower under no-load conditions, and when the high-voltage component is under load, the voltage at the contact point between the high-voltage component and the connector will steadily decrease.

[0039] Based on this, if the comparison result of the first voltage and the battery voltage is that the first voltage is the same as the battery voltage, and the comparison result of the second voltage and the battery voltage is that the battery voltage is greater than the second voltage, and the voltage difference between the battery voltage and the second voltage is greater than or equal to the target threshold, then the electrical connection state of the connector connecting the high-voltage component and the battery pack can be determined to be a loose connection state. Here, "the first voltage is the same as the battery voltage" can mean that the first voltage is equal to the battery voltage, or that the voltage difference between the first voltage and the battery voltage is within a preset voltage range, such as within 50mV. The target threshold can be set according to actual conditions; for example, the target threshold can be the minimum value among the differences between the battery voltage and each measured second voltage when the connector is in a different degree of loose connection state.

[0040] If the comparison result of the first voltage and the battery voltage is that the first voltage is less than the battery voltage, and the comparison result of the second voltage and the battery voltage is that the second voltage is less than the battery voltage, then the electrical connection status of the connector connecting the high-voltage component and the battery pack can be determined to be an aging state. Here, "the first voltage is less than the battery voltage" can mean that the battery voltage is greater than the first voltage and the voltage difference between the two voltages exceeds a preset voltage range, such as exceeding 50mV; the same applies to "the second voltage is less than the battery voltage".

[0041] If the comparison result between the first voltage and the battery voltage is that the first voltage is consistent with the battery voltage, and the comparison result between the second voltage and the battery voltage is that the second voltage is consistent with the battery voltage, and if the voltage difference between the first voltage and the battery voltage is within 50mV, and the voltage difference between the second voltage and the battery voltage is within 50mV, then the electrical connection status of the connector connecting the high-voltage component and the battery pack is normal.

[0042] By acquiring the first voltage at the high-voltage input terminal of any high-voltage component connected to the battery pack under no-load conditions and the second voltage at the high-voltage input terminal under load conditions, the electrical connection status of the connector connecting the high-voltage component and the battery pack can be obtained based on the comparison results of the first voltage and the battery voltage of the battery pack, as well as the comparison results of the second voltage and the battery voltage. Furthermore, by acquiring and comparing the relationship between the input voltage and battery voltage of the same high-voltage component under both no-load and load conditions, the dynamic voltage drop generated on the connector connected to the high-voltage component is measured. The no-load voltage reflects the static connection continuity, and the load voltage reflects the true state of the dynamic connection resistance. This allows for precise identification of which connector is malfunctioning and, more importantly, a precise determination of whether the connector is in an ideal low-resistance connection state, an aging state due to increased resistance caused by contact surface deterioration, or a loose connection state, thereby improving the accuracy of connector status detection.

[0043] In actual operation, high-voltage components undergo multiple no-load and load state transitions. If the acquired first and second voltages do not respond to the same state transition event, they may originate from different operating cycles with long time intervals. In this case, the system conditions at the two voltage sampling times, such as battery voltage, ambient temperature, and load history, may differ significantly. Using first and second voltages from different operating cycles with long time intervals for connector state detection may introduce irrelevant system drift and interference into the detection results, leading to a decrease in the accuracy of connector state detection. Therefore, to further improve the accuracy of connector state detection, in some embodiments, acquiring the first voltage at the high-voltage input terminal of any high-voltage component connected to the battery pack in the no-load state, and the second voltage at the high-voltage input terminal of the high-voltage component in the load state, includes: In response to a trigger signal instructing the high-voltage component to switch from the no-load state to the loaded state, the first voltage before the switch and the second voltage after the switch are acquired.

[0044] In some embodiments, the electronic device can continuously acquire voltage data from the high-voltage component. When a trigger signal indicating that the high-voltage component is switching from an unloaded state to a loaded state is detected, the device can respond to the trigger signal and acquire, from the acquired voltage data, the voltage data of the high-voltage component in the unloaded state before switching from the unloaded state to the loaded state as the first voltage, and the voltage data of the high-voltage component in the loaded state after switching from the unloaded state to the loaded state as the second voltage.

[0045] Since the first voltage and the second voltage are the voltages of the high-voltage component before and after a single no-load to load state switch, the acquisition of the first voltage and the second voltage can be closely correlated in time and directly corresponded in cause and effect. This eliminates the risk of misjudgment caused by comparing the battery voltage with asynchronous and uncorrelated voltage data, making the detection of the electrical connection status of the connector have temporal consistency and logical necessity, thereby improving the accuracy of subsequent connector status detection using the first voltage and the second voltage.

[0046] To reduce the misjudgment of the electrical connection status of connectors as a loose connection and further improve the accuracy of connector status detection, in some embodiments, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage of the battery pack, including: If the voltage difference between the first voltage and the battery voltage is less than a first threshold, and among the second voltages sampled multiple times within a preset continuous period, at least one second voltage has a voltage drop between it and the battery voltage that exceeds a second threshold, and the fluctuation amplitude of each second voltage within the preset continuous period exceeds a preset amplitude, then the electrical connection state of the connector is determined to be a loose connection state. Wherein, the first threshold is less than the second threshold.

[0047] When a connector for a high-voltage component is loosely connected, the voltage of the high-voltage component connected to that connector is usually normal under no-load conditions. However, when the high-voltage component is under load, the entire loop is energized. The poor current-carrying capacity of the loosely connected connector will generate a large impedance, resulting in a significant voltage drop. Therefore, when the high-voltage component is under load, in addition to a significant drop, it will also fluctuate or even intermittently return to zero.

[0048] Based on this, in some embodiments, after the high-voltage component switches from an unloaded state to a loaded state, the first voltage with the timestamp closest to the current moment can be compared with the battery voltage. Furthermore, multiple samples of the second voltage taken by the high-voltage component within a preset continuous period after switching to the loaded state can be compared with the battery voltage to detect whether the voltage difference between the first voltage and the battery voltage is less than a first threshold, and whether any of the second voltages sampled multiple times within the preset continuous period has a voltage drop with the battery voltage exceeding a second threshold. The preset continuous period refers to a continuous working time selected for diagnosing the electrical connection status of the connector, and can be dynamically determined based on the operating characteristics of the high-voltage component. For example, it could be the first 30 seconds after the high-voltage component switches to the loaded state, or 60 seconds after the load stabilizes. The first threshold is used to reflect smaller voltage fluctuations, and the second threshold, being greater than the first threshold, is used to reflect larger voltage fluctuations. The first and second thresholds can be set according to actual conditions.

[0049] In some embodiments, the first threshold may be determined based on the electrical characteristic parameters of the connector in a normal connection state, and the second threshold may be determined based on the electrical characteristic parameters of the connector in a dummy connection state.

[0050] For example, the first threshold can be based on the product of the maximum permissible contact resistance of the connector under normal connection conditions and the current of the high-voltage component under no-load conditions, such as quiescent current or leakage current, plus a certain safety margin. This product reflects the maximum normal voltage drop that may occur under good connection conditions. Setting it as the first threshold ensures that if there is no obvious abnormal voltage drop under no-load conditions, the static conductivity is considered good. The second threshold can be determined based on the product of the typical or critical contact resistance value exhibited by the connector under a loose connection fault condition and the operating current of the high-voltage component under rated load conditions. This critical resistance value can be obtained through experimental statistics, simulation analysis, or the lower limit of fault impedance defined in safety specifications. The corresponding voltage drop is the second threshold, used to reliably distinguish between normal load voltage drop and abnormal voltage drop characterizing a loose connection.

[0051] Alternatively, experiments can be conducted to obtain the battery voltage of the battery pack connected to the connector in a normal connection state, and multiple first voltages of the high-voltage component connected to the connector in an unloaded state. The maximum value among the differences between these multiple first voltages and the battery voltage is determined as the electrical characteristic parameter of the connector in a normal connection state, i.e., the first threshold. Furthermore, experiments can be conducted to obtain the battery voltage of the battery pack connected to the connector in a detached connection state, and multiple first voltages of the high-voltage component connected to the connector in a loaded state. The minimum value among the differences between these multiple first voltages and the battery voltage is determined as the electrical characteristic parameter of the connector in a detached connection state, i.e., the second threshold.

[0052] If the voltage difference between the first voltage and the battery voltage is less than a first threshold, and at least one of the second voltages sampled multiple times within a preset continuous time period has a voltage drop exceeding the second threshold, then the fluctuation amplitude of each of the second voltages sampled multiple times within the preset continuous time period can be detected. The fluctuation amplitude refers to the difference between the maximum and minimum values ​​in the voltage sequence obtained by sampling the second voltage of the high-voltage component under load multiple times within the preset continuous time period. This indicator quantifies the overall severity and dispersion range of voltage changes within that period, and its magnitude directly reflects the instability of the electrical contact at the connection point, corresponding to the instantaneous drastic change in resistance caused by unstable physical contact at the connection point. When the connector and the high-voltage component are loosely connected, there may be instantaneous separation or arcing at the contact point, leading to more severe random jumps in contact resistance and unstable voltage output. Therefore, if the fluctuation amplitude of each second voltage exceeds a preset amplitude, it can be determined that there is instantaneous separation or arcing at the contact point between the connector and the high-voltage component, and the electrical connection state of the connector can be determined to be loose. This improves the reliability of the detection result that the electrical connection status of the connector is a loose connection, reduces the possibility of misjudging the electrical connection status of the connector as a loose connection, and further improves the accuracy of connector status detection.

[0053] To improve the reliability of the detection result that the electrical connection state of the connector is in an aging state, in some embodiments, the electrical connection state of the connector connecting the high-voltage component and the battery pack is obtained based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage of the battery pack, including: By determining that the first voltage is greater than zero and less than the battery voltage, and the second voltage is less than the battery voltage, the electrical connection state of the connector is determined to be an aging state.

[0054] As connectors age, they can be considered equivalent to a stable contact resistance. In this case, under no-load conditions, the voltage at the high-voltage input terminal of the high-voltage component, which is normally connected to the connector, may be slightly lower than the battery voltage, but not zero. However, under load, the voltage at the high-voltage input terminal of this component will remain consistently low and steadily decrease.

[0055] Based on this, in some embodiments, after the high-voltage component switches from an unloaded state to a loaded state, the first voltage whose timestamp is closest to the current time can be detected, and the second voltages sampled multiple times within a preset continuous period after the high-voltage component switches to the loaded state can be compared with the battery voltage. If the first voltage whose timestamp is closest to the current time is greater than zero and less than the battery voltage, and the second voltages sampled multiple times within the preset continuous period are all less than the battery voltage, it indicates that the first voltage is greater than zero and less than the battery voltage, and the second voltage is less than the battery voltage. At this time, the electrical connection state of the connector can be determined to be an aging state.

[0056] To further improve the reliability of the detection result that the electrical connection state of the connector is in an aging state, and to further improve the accuracy of the connector state detection, in some embodiments, the electrical connection state of the connector connecting the high-voltage component and the battery pack is obtained based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage of the battery pack, including: If the voltage difference between the first voltage and the battery voltage is less than a third threshold, and the second voltage sampled multiple times within a preset continuous period is consistently lower than the battery voltage and shows a downward trend, then the electrical connection state of the connector is determined to be an aging state. The third threshold is determined based on the electrical characteristic parameters of the connector in its normal connection state. For example, the third threshold may be the same as the first threshold described above.

[0057] Considering that when the connector at the high-voltage input terminal of the high-voltage component ages, the voltage of the high-voltage component connected to the connector may be normal under no-load conditions. However, when the high-voltage component is under load, the voltage at the contact point with the connector will remain low and steadily decrease, and may also be accompanied by the plug heating up, causing the voltage to drop further.

[0058] Based on this, in some embodiments, after the high-voltage component switches from an unloaded state to a loaded state, the first voltage closest to the current time and the battery voltage can be compared, and the second voltage sampled multiple times by the high-voltage component during a preset continuous period after switching to the loaded state can be compared with the battery voltage to detect whether the voltage difference between the first voltage and the battery voltage is less than a third threshold, and whether the second voltage sampled multiple times during the preset continuous period is continuously lower than the battery voltage.

[0059] If the voltage difference between the first voltage and the battery voltage is less than the third threshold, and the second voltage sampled multiple times within a preset continuous period is lower than the battery voltage, then the temporal trend of each second voltage within the preset continuous period is detected. If each second voltage shows a decreasing trend, it indicates that the voltage at the high-voltage input terminal of the high-voltage component is continuously low and steadily decaying. At this time, it can be determined that the electrical connection state of the connector is aging.

[0060] The downward trend refers to the overall decreasing trend of the values ​​of the second voltages collected within a preset continuous time period. For example, the second voltages sampled within the preset continuous time period can be sorted by sampling time to obtain a voltage sampling sequence. A linear regression can then be performed on the voltage sampling sequence. If the slope of the fitted line is negative and its absolute value is greater than a preset slope threshold, then the second voltages are determined to show a downward trend. Alternatively, the absolute value of the difference between the last and first second voltages sampled within the preset continuous time period can be calculated. If this absolute value is greater than a preset voltage difference threshold, then the second voltages are determined to show a downward trend.

[0061] This improves the reliability of the test result that the electrical connection status of the connector is in an aging state, reduces the possibility of misjudging the electrical connection status of the connector as an aging state, and further improves the accuracy of the connector status detection.

[0062] To reduce the possibility of over-balancing of individual battery cells during the balancing process and further improve the reliability of connector status detection, in some embodiments, the method further includes: If both the first voltage and the second voltage are determined to be less than or equal to the fourth threshold, the electrical connection state of the connector is determined to be an open circuit fault state. The fourth threshold is determined based on the electrical characteristic parameters of the connector under an open-circuit fault condition.

[0063] In some embodiments, the fourth threshold can be the maximum equivalent offset voltage that the high-voltage input terminal of the corresponding high-voltage component may experience due to parasitic impedance, sensor bias, and environmental electromagnetic interference when the connector is in an open-circuit fault state. For example, the maximum residual voltage value detectable at the high-voltage input terminal of the corresponding high-voltage component when the connector is confirmed to be in an open-circuit fault state can be obtained through experimental measurement or simulation analysis. This value, plus a certain safety margin, is then set as the fourth threshold. This fourth threshold is typically a voltage value far below the battery voltage and close to zero.

[0064] After the high-voltage component switches from an unloaded state to a loaded state, if the first voltage of the high-voltage component before the switch and the second voltage of the high-voltage component sampled multiple times within a preset continuous period after the switch are both less than or equal to the fourth threshold, it can be determined that the battery pack is not supplying power to the high-voltage component through the connector. At this time, the electrical connection status of the connector connecting the high-voltage component and the battery pack can be obtained as an open circuit fault state.

[0065] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below. In some embodiments, such as Figure 3 As shown, the status detection method of this connector includes: S201, in response to a trigger signal indicating that the high-voltage component connected to the battery pack is switching from an unloaded state to a loaded state, acquires the first voltage of the high-voltage component in the unloaded state before the switch, and the second voltage of the high-voltage component in the loaded state after the switch.

[0066] S202, based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained.

[0067] Specifically, if the voltage difference between the first voltage and the battery voltage is less than a first threshold, and among the second voltages sampled multiple times within a preset continuous time period, at least one second voltage has a voltage drop exceeding the second threshold, and the fluctuation amplitude of each second voltage within the preset continuous time period exceeds a preset amplitude, the electrical connection state of the connector is determined to be a loose connection state. The first threshold is less than the second threshold. The first threshold is determined based on the electrical characteristic parameters of the connector in a normal connection state, and the second threshold is determined based on the electrical characteristic parameters of the connector in a loose connection state.

[0068] If the first voltage is greater than zero and less than the battery voltage, and the second voltage is less than the battery voltage, the electrical connection state of the connector is determined to be an aging state. Alternatively, if the voltage difference between the first voltage and the battery voltage is less than a third threshold, and the second voltage sampled multiple times within a preset continuous period is consistently lower than the battery voltage and shows a decreasing trend, the electrical connection state of the connector is determined to be an aging state, wherein the third threshold is determined based on the electrical characteristic parameters of the connector in a normal connection state.

[0069] If both the first voltage and the second voltage are less than or equal to the fourth threshold, the electrical connection state of the connector is determined to be an open-circuit fault state, wherein the fourth threshold is determined based on the electrical characteristic parameters of the connector in the open-circuit fault state.

[0070] The connector state detection device provided in this application is described below. The connector state detection device described below can be referred to in correspondence with the connector state detection method described above.

[0071] In one embodiment, such as Figure 4 As shown, a connector status detection device is provided, comprising: The voltage acquisition module 210 is used to acquire the first voltage of the high voltage input terminal of any high voltage component connected to the battery pack in the no-load state, and the second voltage of the high voltage input terminal of the high voltage component in the load state. The interlock detection module 220 is used to obtain the electrical connection status of the connector connecting the high-voltage component and the battery pack based on the comparison result of the first voltage and the battery voltage of the battery pack, and the comparison result of the second voltage and the battery voltage.

[0072] By acquiring the first voltage at the high-voltage input terminal of any high-voltage component connected to the battery pack under no-load conditions and the second voltage at the high-voltage input terminal under load conditions, the electrical connection status of the connector connecting the high-voltage component and the battery pack can be obtained based on the comparison results of the first voltage and the battery voltage of the battery pack, as well as the comparison results of the second voltage and the battery voltage. Furthermore, by acquiring and comparing the relationship between the input voltage and battery voltage of the same high-voltage component under both no-load and load conditions, the dynamic voltage drop generated on the connector connected to the high-voltage component is measured. The no-load voltage reflects the static connection continuity, and the load voltage reflects the true state of the dynamic connection resistance. This allows for precise identification of which connector is malfunctioning and, more importantly, a precise determination of whether the connector is in an ideal low-resistance connection state, an aging state due to increased resistance caused by contact surface deterioration, or a loose connection state, thereby improving the accuracy of connector status detection.

[0073] In one embodiment, the voltage acquisition module 210 is specifically used for: In response to a trigger signal instructing the high-voltage component to switch from the no-load state to the loaded state, the first voltage before the switch and the second voltage after the switch are acquired.

[0074] In one embodiment, the interlock detection module 220 is specifically used for: If the voltage difference between the first voltage and the battery voltage is less than a first threshold, and among the second voltages sampled multiple times within a preset continuous period, at least one second voltage has a voltage drop between it and the battery voltage that exceeds a second threshold, and the fluctuation amplitude of each second voltage within the preset continuous period exceeds a preset amplitude, then the electrical connection state of the connector is determined to be a loose connection state. Wherein, the first threshold is less than the second threshold; the first threshold is determined based on the electrical characteristic parameters of the connector in a normal connection state, and the second threshold is determined based on the electrical characteristic parameters of the connector in a loose connection state.

[0075] In one embodiment, the interlock detection module 220 is specifically used for: By determining that the first voltage is greater than zero and less than the battery voltage, and the second voltage is less than the battery voltage, the electrical connection state of the connector is determined to be an aging state.

[0076] In one embodiment, the interlock detection module 220 is specifically used for: If the voltage difference between the first voltage and the battery voltage is less than a third threshold, and the second voltage sampled multiple times within a preset continuous period is consistently lower than the battery voltage and shows a downward trend, then the electrical connection state of the connector is determined to be an aging state. The third threshold is determined based on the electrical characteristic parameters of the connector in its normal connection state.

[0077] In one embodiment, the interlock detection module 220 is further configured to: If both the first voltage and the second voltage are determined to be less than or equal to the fourth threshold, the electrical connection state of the connector is determined to be an open circuit fault state. The fourth threshold is determined based on the electrical characteristic parameters of the connector under an open-circuit fault condition.

[0078] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 can call a computer program in the memory 830 to execute a connector status detection method, such as including: Obtain the first voltage at the high voltage input terminal of any high voltage component connected to the battery pack in an unloaded state, and the second voltage at the high voltage input terminal of the high voltage component in a loaded state; Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained.

[0079] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0080] On the other hand, embodiments of this application also provide a storage medium, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the connector status detection method provided in the above embodiments, for example including: Obtain the first voltage at the high voltage input terminal of any high voltage component connected to the battery pack in an unloaded state, and the second voltage at the high voltage input terminal of the high voltage component in a loaded state; Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained.

[0081] This application also provides a vehicle, which can be a hybrid vehicle or a pure electric vehicle equipped with a battery, including a battery pack, at least one high-voltage component, and electronic equipment as described in the above embodiments; each high-voltage component is connected to the battery pack through a corresponding connector, and each high-voltage component is communicatively connected to the electronic equipment.

[0082] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0083] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method of detecting a state of a connector, characterized by, include: Obtain the first voltage at the high voltage input terminal of any high voltage component connected to the battery pack in an unloaded state, and the second voltage at the high voltage input terminal of the high voltage component in a loaded state; Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained.

2. The method of claim 1, wherein Acquiring the first voltage at the high-voltage input terminal of any high-voltage component connected to the battery pack in an unloaded state, and the second voltage at the high-voltage input terminal of the high-voltage component in a loaded state, includes: In response to a trigger signal instructing the high-voltage component to switch from the no-load state to the loaded state, the first voltage before the switch and the second voltage after the switch are acquired.

3. The method of detecting the state of the connector according to claim 1 or 2, characterized by, Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage of the battery pack, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained, including: If the voltage difference between the first voltage and the battery voltage is less than a first threshold, and among the second voltages sampled multiple times within a preset continuous period, at least one second voltage has a voltage drop between it and the battery voltage that exceeds a second threshold, and the fluctuation amplitude of each second voltage within the preset continuous period exceeds a preset amplitude, then the electrical connection state of the connector is determined to be a loose connection state. Wherein, the first threshold is less than the second threshold.

4. The method of claim 3, wherein The first threshold is determined based on the electrical characteristic parameters of the connector in a normal connection state, and the second threshold is determined based on the electrical characteristic parameters of the connector in a loose connection state.

5. The method of detecting the state of the connector according to claim 1 or 2, characterized by, Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage of the battery pack, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained, including: By determining that the first voltage is greater than zero and less than the battery voltage, and the second voltage is less than the battery voltage, the electrical connection state of the connector is determined to be an aging state.

6. The method of detecting the state of the connector according to claim 1 or 2, wherein Based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage of the battery pack, the electrical connection status of the connector connecting the high-voltage component and the battery pack is obtained, including: If the voltage difference between the first voltage and the battery voltage is less than a third threshold, and the second voltage sampled multiple times within a preset continuous period is consistently lower than the battery voltage and shows a downward trend, then the electrical connection state of the connector is determined to be an aging state. The third threshold is determined based on the electrical characteristic parameters of the connector in its normal connection state.

7. The method of claim 1, wherein Also includes: If both the first voltage and the second voltage are determined to be less than or equal to the fourth threshold, the electrical connection state of the connector is determined to be an open circuit fault state. The fourth threshold is determined based on the electrical characteristic parameters of the connector under an open-circuit fault condition.

8. A connector status detection device, characterized in that, include: The voltage acquisition module is used to acquire the first voltage of the high voltage input terminal of any high voltage component connected to the battery pack in the no-load state, and the second voltage of the high voltage input terminal of the high voltage component in the load state. The interlock detection module is used to determine the electrical connection status of the connector connecting the high-voltage component and the battery pack based on the comparison results of the first voltage and the battery voltage of the battery pack, and the comparison results of the second voltage and the battery voltage.

9. An electronic device comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the connector status detection method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, Includes a battery pack, at least one high-voltage component, and the electronic device as described in claim 9; Each of the high-voltage components is connected to the battery pack via a corresponding connector, and each of the high-voltage components is communicatively connected to the electronic device.

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