Early warning device, method and equipment for insulation performance reduction of charging cable of new energy automobile

Abstract

The invention discloses an early warning device, method and equipment for insulation performance reduction of a charging cable of a new energy automobile, and belongs to the technical field of electric power facilities. The device comprises an insulation resistance acquisition module used for acquiring an insulation resistance value of a charging cable of the new energy automobile according to a preset period; the leakage current acquisition module is used for acquiring the leakage current of the charging cable in the working process of the charging cable; the insulation performance reduction identification module is used for identifying whether the leakage current exceeds a set safety threshold value or not, and if yes, it is determined that the insulation performance of the charging cable is reduced; and the early warning module is used for generating early warning information and terminating the charging state of the new energy automobile by the charging cable. According to the technical scheme, the early warning information can be generated under the condition that the insulation performance is reduced, workers can be informed to carry out timely manual intervention processing, and the problems that the charging efficiency is reduced and potential safety hazards exist due to the fact that the insulation performance is reduced are solved.

Description

Technical Field

[0001] The present application belongs to the technical field of electric power facilities, and specifically relates to a device, method and equipment for early warning of insulation degradation of a charging cable of a new energy vehicle. Background Art

[0002] With the rapid development of science and technology, the number of new energy vehicles has increased dramatically in a few years, and the charging equipment for new energy vehicles has also increased.

[0003] For the charging cables used in the charging process of new energy vehicles, since their installation environment is often in outdoor parking lots, the ambient temperature varies greatly, and they are affected by the sun and rain, etc., which can easily cause aging and damage to the insulation layer of the charging cable. In one case, although the insulation layer of the charging cable is not obviously damaged, the insulation performance of the insulation layer will decline with aging or the influence of the external environment. This has many adverse effects on the safety of the use of the charging cable and the use requirements of high-power charging. Therefore, how to timely detect and prevent the problem of degradation of the insulation performance of the insulation layer of the charging cable is one of the most important issues in this field. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a device, method and equipment for warning the degradation of insulation performance of charging cables of new energy vehicles. The purpose is to achieve comprehensive perception of the problem of degradation of insulation performance of charging cables through insulation resistance detection and leakage current detection, and generate warning information when the insulation performance is degraded, so as to inform the staff to carry out timely manual intervention and avoid the problem of reduced charging efficiency and potential safety hazards caused by the degradation of insulation performance.

[0005] In a first aspect, an embodiment of the present application provides a warning device for insulation degradation of a charging cable of a new energy vehicle, the device comprising:

[0006] An insulation resistance acquisition module is used to collect the insulation resistance value of the charging cable of the new energy vehicle according to a preset period;

[0007] a leakage current collection module, configured to collect the leakage current of the charging cable during the operation of the charging cable when the insulation resistance value is less than a set ratio of a preset standard value;

[0008] an insulation performance degradation identification module, used to identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded;

[0009] The early warning module is used to generate early warning information and terminate the charging state of the charging cable for the new energy vehicle.

[0010] Furthermore, the insulation resistance acquisition module is specifically used for:

[0011] Acquiring physical parameters of the charging cable;

[0012] determining a DC test voltage to be applied to the charging cable according to the physical parameter;

[0013] Applying the DC test voltage to the charging cable according to a preset period to collect a micro current of the charging cable;

[0014] The insulation resistance value of the charging cable is determined according to the DC test voltage and the micro-current.

[0015] Furthermore, the insulation resistance acquisition module is also specifically used for:

[0016] After removing the DC test voltage applied to the charging cable, obtaining comparative current data of the insulation layer of the charging cable;

[0017] After collecting the microcurrent of the charging cable, performing noise elimination processing on the microcurrent using the comparison current data, and filtering the noise elimination result to obtain a calculated current;

[0018] An insulation resistance value of the charging cable is determined according to the DC test voltage and the calculated current.

[0019] Furthermore, the insulation performance degradation identification module includes:

[0020] a safety threshold selection unit, configured to obtain a safety threshold corresponding to the charging cable;

[0021] The comparison unit is used to identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded.

[0022] Furthermore, the security threshold selection unit is specifically used to:

[0023] Acquiring physical parameters of the charging cable;

[0024] According to the physical parameter, a safety threshold corresponding to the charging cable is selected from a memory according to a preset corresponding rule.

[0025] Furthermore, the insulation performance degradation identification module is also used for:

[0026] It is identified whether the detected increase amplitude of the leakage current exceeds a set amplitude threshold, and if so, it is determined that the insulation performance of the charging cable is degraded.

[0027] Furthermore, the insulation performance degradation identification module is specifically used for:

[0028] Obtaining the detected leakage current and drawing a leakage current curve;

[0029] Identifying distortion points in the leakage current curve, filtering out the distortion points, and obtaining a smooth curve;

[0030] The rising trend of the gentle curve is calculated according to the first time window length and the second time window length, and when the rising amplitude corresponding to the first time window length exceeds a set first amplitude threshold, and the rising amplitude corresponding to the second time window length exceeds a set second amplitude threshold, it is determined that the insulation performance of the charging cable is degraded.

[0031] In a second aspect, an embodiment of the present application provides a method for early warning of insulation degradation of a charging cable of a new energy vehicle, the method comprising:

[0032] Collect the insulation resistance value of the charging cable of the new energy vehicle according to the preset period;

[0033] When the insulation resistance value is less than a set ratio of a preset standard value, collecting a leakage current of the charging cable during operation of the charging cable;

[0034] Identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded;

[0035] Generate a warning message and terminate the charging state of the new energy vehicle by the charging cable.

[0036] Furthermore, the insulation resistance value of the charging cable of the new energy vehicle is collected according to a preset period, including:

[0037] Acquiring physical parameters of the charging cable;

[0038] determining a DC test voltage to be applied to the charging cable according to the physical parameter;

[0039] Applying the DC test voltage to the charging cable according to a preset period to collect a micro current of the charging cable;

[0040] The insulation resistance value of the charging cable is determined according to the DC test voltage and the micro-current.

[0041] In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect.

[0042] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0043] In a fifth aspect, an embodiment of the present application provides a chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the method described in the first aspect.

[0044] In the embodiment of the present application, the insulation resistance acquisition module is used to collect the insulation resistance value of the charging cable of the new energy vehicle according to a preset period; the leakage current acquisition module is used to collect the leakage current of the charging cable during the operation of the charging cable when the insulation resistance value is less than a set ratio of the preset standard value; the insulation performance degradation identification module is used to identify whether the detected leakage current exceeds the set safety threshold, and if it exceeds, it is determined that the insulation performance of the charging cable has been degraded; the early warning module is used to generate early warning information and terminate the charging status of the charging cable for the new energy vehicle. The above technical solution can realize the comprehensive perception of the problem of insulation performance degradation of the charging cable, and generate early warning information when the insulation performance is degraded, which can inform the staff to carry out timely manual intervention to avoid the problem of reduced charging efficiency and potential safety hazards caused by insulation performance degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of a warning device for insulation degradation of a charging cable of a new energy vehicle provided in Example 1 of the present application;

[0046] Figure 2 It is a structural schematic diagram of a warning device for insulation degradation of a charging cable of a new energy vehicle provided in Embodiment 2 of the present application;

[0047] Figure 3 It is a flow chart of a method for early warning of insulation degradation of a charging cable of a new energy vehicle provided in Embodiment 3 of the present application;

[0048] Figure 4 It is a schematic diagram of the structure of the electronic device provided in Example 4 of the present application. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for the convenience of description, only the part related to the present application but not all the contents are shown in the accompanying drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow chart describes each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. The process can be terminated when its operation is completed, but it can also have additional steps not included in the accompanying drawings. The process can correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0051] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0052] In conjunction with the accompanying drawings, the following describes in detail the device, method and equipment for warning the insulation degradation of the charging cable of a new energy vehicle provided by the embodiments of the present application through specific embodiments and their application scenarios.

[0053] Embodiment 1

[0054] Figure 1 Schematic diagram of the structure of the warning device for insulation degradation of the charging cable of a new energy vehicle provided in the first embodiment of the present application. Figure 1 As shown, the device comprises:

[0055] The insulation resistance acquisition module 110 is used to acquire the insulation resistance value of the charging cable of the new energy vehicle according to a preset period;

[0056] A leakage current collection module 120, configured to collect the leakage current of the charging cable during operation of the charging cable when the insulation resistance value is less than a set ratio of a preset standard value;

[0057] The insulation performance degradation identification module 130 is used to identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded;

[0058] The warning module 140 is used to generate warning information and terminate the charging state of the charging cable for the new energy vehicle.

[0059] Among them, new energy vehicles can be cars that rely on new energy as a power source. Different from traditional fuel vehicles, they are gradually occupying an important position in the current transportation field, and the safety of their charging process is very critical.

[0060] Charging cables are cables that connect charging equipment and new energy vehicles and are used to transmit electrical energy. The insulation performance is directly related to whether the charging process is safe. If there is a problem with the insulation, it may lead to dangerous situations such as leakage. The insulation resistance value can be a physical quantity that characterizes the insulation performance of the charging cable. Its value reflects the ability of the cable to prevent current from passing through the insulation part. The unit is usually ohm (Ω). The larger the value, the better the insulation performance, and the smaller the value, the more likely there is a problem with the insulation and the risk of leakage.

[0061] The preset period can be a time interval pre-set in the system. According to this fixed time interval, the insulation resistance acquisition module 110 will perform the operation of collecting insulation resistance values. For example, it can be set to collect once every 5 minutes, etc. The specific duration is determined according to the actual usage scenario and safety requirements.

[0062] In this solution, the insulation resistance value of the charging cable can be obtained through corresponding circuit detection and other methods, and accurate resistance value information can be obtained from the corresponding detection points of the charging cable.

[0063] Among them, the preset standard value can be a value determined according to the insulation resistance standard that the charging cable should have under normal insulation conditions. It is a reference for measuring whether the insulation resistance is qualified. For example, it can be set to a specific value such as 1000 megohms based on the material, specifications and industry safety standards of the cable.

[0064] The set ratio can be a pre-set proportional coefficient. The insulation resistance value is compared with the preset standard value through this ratio to determine whether further leakage current detection is needed. For example, the set ratio is 80%. When the insulation resistance value drops to 80% of the preset standard value, the leakage current acquisition module is triggered to start working.

[0065] Leakage current can be the abnormal current passing through the insulation layer when there is a problem with the insulation performance of the charging cable. The unit can be microamperes or milliamperes. The existence of leakage current may cause safety hazards such as damage to the charging equipment and electric shock to people.

[0066] This solution can obtain the specific value of the leakage current when the charging cable is in operation, and collect the leakage current through a specific current detection circuit, sensor, etc.

[0067] Specifically, the leakage current can be collected through the following code:

[0068]

[0069]

[0070] In another example, the following code can also be used:

[0071]

[0072] This solution can realize the calculation of leakage current through the above two codes.

[0073] The safety threshold can be a pre-set critical value of the leakage current. When the collected leakage current exceeds this value, it is considered that the insulation performance of the charging cable has deteriorated to a level that requires human intervention. For example, it is set to 5 milliamperes (mA). Once the detected leakage current is greater than this value, it means that there may be a safety risk and corresponding measures need to be taken.

[0074] This solution determines whether the insulation performance of the current charging cable has degraded by comparing and analyzing the collected leakage current value with the set safety threshold.

[0075] After identification, if the leakage current exceeds the safety threshold, corresponding warning and treatment measures can be triggered.

[0076] Among them, the early warning information may include messages with relevant prompts about the degradation of the insulation performance of the charging cable, which may be presented in various forms such as sound, text display, and sending signals to a remote monitoring platform. For example, a text prompt such as "The insulation performance of the charging cable is abnormal, please check it in time" may pop up on the vehicle's display screen, or an alarm may sound, etc. The purpose is to let users or relevant maintenance personnel quickly know that there are safety hazards.

[0077] This solution determines the degradation of the insulation performance of the charging cable, integrates the corresponding warning information, and at the same time as issuing the warning information, stops the charging cable from continuing to charge the new energy vehicle. By controlling the on and off of the charging circuit, the power transmission is cut off to prevent leakage due to the degradation of insulation performance, which may affect the safety of vehicles and personnel.

[0078] Description of technical effects: The technical solution of generating early warning information and terminating the charging status can, on the one hand, promptly inform relevant personnel of potential safety issues so that they can respond quickly and take measures such as maintenance. On the other hand, directly terminating charging avoids the safety risks that may be aggravated by continuous charging from the root, just like fastening a "seat belt" for the charging process and blowing a "warning whistle" at the same time, ensuring a safe environment for charging new energy vehicles in all aspects.

[0079] The technical solution provided in this embodiment includes an insulation resistance acquisition module, which is used to acquire the insulation resistance value of the charging cable of the new energy vehicle according to a preset period; a leakage current acquisition module, which is used to acquire the leakage current of the charging cable during the operation of the charging cable when the insulation resistance value is less than a set ratio of the preset standard value; an insulation performance degradation identification module, which is used to identify whether the detected leakage current exceeds the set safety threshold, and if so, it is determined that the insulation performance of the charging cable has been degraded; and an early warning module, which is used to generate early warning information and terminate the charging status of the charging cable for the new energy vehicle. By adopting this technical solution, it is possible to fully perceive the problem of insulation performance degradation of the charging cable, and generate early warning information when the insulation performance is degraded, so that the staff can be informed to carry out timely manual intervention to avoid the problem of reduced charging efficiency and potential safety hazards caused by insulation performance degradation.

[0080] In the above embodiment, optionally, the insulation resistance acquisition module is specifically used to:

[0081] Acquiring physical parameters of the charging cable;

[0082] determining a DC test voltage to be applied to the charging cable according to the physical parameter;

[0083] Applying the DC test voltage to the charging cable according to a preset period to collect a micro current of the charging cable;

[0084] The insulation resistance value of the charging cable is determined according to the DC test voltage and the micro-current.

[0085] The physical parameters may be parameters related to some characteristics of the charging cable itself, such as the length, cross-sectional area, material type, material and thickness of the insulation layer of the cable, etc. These parameters are relevant for the subsequent determination of how to apply a suitable DC test voltage.

[0086] The DC test voltage can be the voltage value of the DC power applied to both ends of the cable to detect the insulation resistance of the charging cable. Its value is determined according to the physical parameters of the charging cable. The appropriate DC test voltage can accurately stimulate the corresponding microcurrent to facilitate the subsequent accurate calculation of the insulation resistance value. The unit is usually volt (V). For example, it can be different specific values ​​such as 500V, which should be reasonably set according to the actual situation of the cable.

[0087] Microcurrent can be the current value detected after applying a DC test voltage to the charging cable. It is very small, and the unit is generally in the microampere (μA) level. Its size is closely related to the insulation resistance value. Accurately measuring it can assist in calculating the insulation resistance.

[0088] This solution obtains the physical parameters of the charging cable by reading the cable configuration information pre-stored in the system or interacting with connected sensors and other devices to obtain the actual length, material and other related physical parameters of the cable. After collecting the relevant information, the specific value of the DC test voltage that should be applied to the charging cable can be determined based on the physical parameters, according to certain calculation rules or by referring to a corresponding relationship table. This solution connects the DC test voltage through the corresponding circuit and acts on both ends of the charging cable to detect the microcurrent.

[0089] This solution obtains the physical parameters of the charging cable to reasonably determine the DC test voltage, and then applies voltage to collect microcurrent to determine the insulation resistance value. This process can fully take into account the differences in the characteristics of different cables, making the detection of insulation resistance values ​​more accurate and avoiding detection errors caused by unreasonable methods such as unified fixed voltage testing. This allows for more reliably monitoring the insulation status of the charging cable, providing a more accurate and effective basis for ensuring the safety of charging new energy vehicles.

[0090] In one embodiment, optionally, the insulation resistance acquisition module is further specifically used for:

[0091] After removing the DC test voltage applied to the charging cable, obtaining comparative current data of the insulation layer of the charging cable;

[0092] After collecting the microcurrent of the charging cable, performing noise elimination processing on the microcurrent using the comparison current data, and filtering the noise elimination result to obtain a calculated current;

[0093] An insulation resistance value of the charging cable is determined according to the DC test voltage and the calculated current.

[0094] The comparison current data may be current-related data obtained after the DC test voltage applied to the charging cable is removed. It is mainly used for comparison and reference with the previously collected microcurrent. It can reflect the electromagnetic interference factors in the environment where the insulation layer of the charging cable is located in the absence of the test voltage, which is helpful for more accurate processing of the microcurrent in the future.

[0095] Noise elimination processing can be an operation process of removing the interference noise components mixed in the microcurrent by comparing the correlation between the current data and the microcurrent and the related algorithm. Filtering processing can be to further filter out the residual high-frequency, low-frequency and other interference signals in the noise elimination result by using a filtering circuit or a digital filtering algorithm, so as to make the obtained current data smoother and more stable, and finally obtain the calculated current that can be used to accurately calculate the insulation resistance value.

[0096] This solution collects the comparative current data of the insulation layer of the charging cable, adopts appropriate current detection equipment, etc., and reads the corresponding current value information from the corresponding detection point of the cable to prepare for subsequent data processing.

[0097] This solution obtains comparative current data and performs noise elimination and filtering on the micro-current in turn to obtain the calculated current for determining the insulation resistance value. This can effectively eliminate the influence of external interference factors on the measurement results, greatly improve the accuracy of insulation resistance value calculation, and make the monitoring of the insulation status of the charging cable more reliable, thereby more accurately controlling the safety risks in the charging process of new energy vehicles and ensuring that the charging work is carried out safely and stably.

[0098] In one embodiment, optionally, the insulation performance degradation identification module is further used to:

[0099] It is identified whether the detected increase amplitude of the leakage current exceeds a set amplitude threshold, and if so, it is determined that the insulation performance of the charging cable is degraded.

[0100] The increase amplitude can be the degree to which the leakage current increases within a certain time range or when compared at different detection times. For example, if the leakage current is 1 mA the first time it is detected and 3 mA the second time, then the increase amplitude is 2 mA. It directly reflects the speed and amount of change of the leakage current. By monitoring it, the trend of insulation performance degradation can be better judged.

[0101] The amplitude threshold may be a pre-set standard value. When the increase in the leakage current exceeds the set amplitude threshold, it is determined that the insulation performance of the charging cable has degraded and has exceeded the normal variation range.

[0102] In this solution, by comparing the leakage current values ​​detected successively and calculating the difference, it is determined whether the increase exceeds the amplitude threshold, so that it can be determined that the insulation performance of the charging cable has been degraded.

[0103] This solution identifies the increase in leakage current and determines the degradation of insulation performance based on the amplitude threshold. It not only focuses on the specific value of leakage current, but also considers its changing trend. It can more accurately capture the problem of degradation of charging cable insulation performance and achieve accurate early warning of insulation hazards. It helps to take timely measures to further improve the safety of new energy vehicles during charging and avoid potential safety accidents caused by a sharp decline in insulation performance.

[0104] In one embodiment, optionally, the insulation performance degradation identification module is specifically used to:

[0105] Obtaining the detected leakage current and drawing a leakage current curve;

[0106] Identifying distortion points in the leakage current curve, filtering out the distortion points, and obtaining a smooth curve;

[0107] The rising trend of the gentle curve is calculated according to the first time window length and the second time window length, and when the rising amplitude corresponding to the first time window length exceeds a set first amplitude threshold, and the rising amplitude corresponding to the second time window length exceeds a set second amplitude threshold, it is determined that the insulation performance of the charging cable is degraded.

[0108] The leakage current curve can be a curve drawn by connecting the leakage current values ​​detected at different time points in chronological order, with the horizontal axis being time and the vertical axis being the magnitude of the leakage current. This curve can intuitively show the overall situation of the leakage current changing over time, such as whether it changes steadily, fluctuates, or presents abnormal mutations.

[0109] Distortion points may be points in the leakage current curve that are obviously inconsistent with the overall change trend, or have irregular changes such as abnormal protrusions or depressions. They are often caused by sudden external interference, such as momentary strong electromagnetic interference, or accidental errors in detection equipment. These points will interfere with the judgment of the true change trend of the leakage current, and therefore need to be processed.

[0110] The gentle curve may be a curve which is relatively smoother and more in line with the normal variation law after filtering out the distortion points in the leakage current curve.

[0111] The first time window length and the second time window length can be two different pre-set time interval lengths, which are used to observe the change of leakage current in different time periods. For example, the first time window length can be set to 0.5 minutes, and the second time window length can be set to 1 minute. By analyzing the increase of leakage current in these two time windows of different lengths, the change trend of insulation performance can be comprehensively judged from different time scales, and the insulation status of the cable can be more comprehensively grasped.

[0112] The first amplitude threshold and the second amplitude threshold may be standard values ​​set corresponding to the first time window length and the second time window length, respectively. Only when the rising amplitudes corresponding to the two time windows exceed the respective set thresholds, is it determined that the insulation performance of the charging cable is degraded.

[0113] The benefit of this arrangement is that, by drawing the leakage current curve and processing its distortion points, the relationship between the rising amplitude and the corresponding threshold is analyzed from different time window lengths to determine the degradation of insulation performance. This can effectively eliminate the interference of accidental factors, and comprehensively and accurately capture the changing trend of leakage current from multiple time dimensions, making the judgment of the degradation of the insulation performance of the charging cable more accurate, greatly improving the safety and stability of the entire charging process.

[0114] Embodiment 2

[0115] This embodiment is further optimized on the basis of the above embodiment. Specifically, the insulation performance degradation identification module includes: a safety threshold selection unit, which is used to obtain a safety threshold corresponding to the charging cable; and a comparison unit, which is used to identify whether the detected leakage current exceeds the set safety threshold. If so, it is determined that the insulation performance of the charging cable is degraded. Figure 2 Schematic diagram of the structure of the warning device for insulation degradation of the charging cable of a new energy vehicle provided in the second embodiment of the present application. Figure 2 As shown, the device comprises:

[0116] The insulation resistance acquisition module 210 is used to acquire the insulation resistance value of the charging cable of the new energy vehicle according to a preset period;

[0117] A leakage current collection module 220, configured to collect the leakage current of the charging cable during operation of the charging cable when the insulation resistance value is less than a set ratio of a preset standard value;

[0118] The insulation performance degradation identification module 230 is used to identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded;

[0119] The warning module 240 is used to generate warning information and terminate the charging state of the charging cable for the new energy vehicle.

[0120] The insulation performance degradation identification module 230 includes:

[0121] A safety threshold selection unit 231, configured to obtain a safety threshold corresponding to the charging cable;

[0122] The comparison unit 232 is used to identify whether the detected leakage current exceeds a set safety threshold. If so, it is determined that the insulation performance of the charging cable is degraded.

[0123] The safety threshold selection unit 231 is used to obtain a safety threshold suitable for the currently detected charging cable. It may select a corresponding accurate value from a plurality of pre-set threshold data according to the specific type of the charging cable, such as cables of different specifications and materials, different usage environments, and other factors.

[0124] The comparison unit 232 is used to compare and analyze the actual detected leakage current value with the acquired set safety threshold. Through this comparison operation, it is determined whether the current leakage current exceeds the safety range and whether the insulation performance of the charging cable has degraded.

[0125] The technical solution provided in this embodiment realizes the function of obtaining the adapted safety threshold in a refined manner and making accurate comparison and judgment by setting the safety threshold selection unit and the comparison unit. This solution can fully take into account the differences in the characteristics of different charging cables and the use environment, more accurately identify the degradation of insulation performance, avoid the misjudgment problem that may be caused by the use of a unified fixed threshold, effectively improve the accuracy and reliability of monitoring the insulation performance of new energy vehicle charging cables, and ensure the safety and stability of the charging process.

[0126] In the above embodiment, optionally, the security threshold selection unit is specifically used to:

[0127] Acquiring physical parameters of the charging cable;

[0128] According to the physical parameter, a safety threshold corresponding to the charging cable is selected from a memory according to a preset corresponding rule.

[0129] Among them, the physical parameters may be some relevant parameters of the charging cable itself that can reflect its characteristics, such as the length, cross-sectional area, material type, material and thickness of the insulation layer, etc. of the cable.

[0130] The preset corresponding rules can be a set of rules pre-set in the system design stage, which clearly stipulates the correspondence between various physical parameters of the charging cable and the safety threshold. For example, the rule may be set to correspond to a specific safety threshold value when the cable length is within a certain range, the material is a certain type, and the insulation thickness reaches a certain value.

[0131] The memory can be a component in the system used to store various data, and here it mainly stores the safety threshold data corresponding to the physical parameters of different charging cables. Specifically, it can be a hardware-level storage chip, storage hard disk and other devices.

[0132] This solution can accurately find the operation of the safety threshold that matches the acquired physical parameters of the charging cable according to the preset corresponding rules from the memory.

[0133] Through such a setting, this solution fully considers the impact of the characteristics of different cables on the safety threshold, so that the selected safety threshold is more in line with the actual situation, thereby making the subsequent judgment on the degradation of the insulation performance of the charging cable more accurate, reducing misjudgment caused by unreasonable thresholds, and further improving the safety of new energy vehicles during charging.

[0134] Embodiment 3

[0135] Figure 3 1 is a flow chart of a method for early warning of insulation degradation of a charging cable of a new energy vehicle provided in Embodiment 3 of the present application. Figure 3 As shown, the specific steps include:

[0136] S301, collecting the insulation resistance value of the charging cable of the new energy vehicle according to a preset period;

[0137] S302: When the insulation resistance value is less than a set proportion of a preset standard value, collecting a leakage current of the charging cable during operation of the charging cable;

[0138] S303, identifying whether the detected leakage current exceeds a set safety threshold, and if so, determining that the insulation performance of the charging cable is degraded;

[0139] S304: Generate warning information and terminate the charging state of the new energy vehicle by the charging cable.

[0140] Furthermore, the insulation resistance value of the charging cable of the new energy vehicle is collected according to a preset period, including:

[0141] Acquiring physical parameters of the charging cable;

[0142] determining a DC test voltage to be applied to the charging cable according to the physical parameter;

[0143] Applying the DC test voltage to the charging cable according to a preset period to collect a micro current of the charging cable;

[0144] The insulation resistance value of the charging cable is determined according to the DC test voltage and the micro-current.

[0145] In this embodiment, the insulation resistance value of the charging cable of the new energy vehicle is collected according to a preset period; when the insulation resistance value is less than a set ratio of the preset standard value, the leakage current of the charging cable is collected during the operation of the charging cable; it is identified whether the detected leakage current exceeds the set safety threshold, and if it exceeds, it is determined that the insulation performance of the charging cable has degraded; an early warning message is generated, and the charging status of the charging cable for the new energy vehicle is terminated. Through such a setting, this solution can achieve a comprehensive perception of the problem of insulation performance degradation of the charging cable, and generate an early warning message when the insulation performance is degraded, which can inform the staff to carry out timely manual intervention to avoid the problem of reduced charging efficiency and potential safety hazards caused by insulation performance degradation.

[0146] The method for warning of insulation degradation of a charging cable of a new energy vehicle provided in an embodiment of the present application corresponds to the device for warning of insulation degradation of a charging cable of a new energy vehicle provided in the above-mentioned embodiment, and has the same execution process and beneficial effects. To avoid repetition, they will not be described here.

[0147] Embodiment 4

[0148] like Figure 4 As shown, an embodiment of the present application also provides an electronic device 400, including a processor 401, a memory 402, and a program or instruction stored in the memory 402 and executable on the processor 401. When the program or instruction is executed by the processor 401, each process of the embodiment of the above-mentioned new energy vehicle charging cable insulation performance degradation warning device is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0149] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0150] Embodiment 5

[0151] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the embodiment of the above-mentioned new energy vehicle charging cable insulation performance degradation warning device is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0152] The processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0153] Embodiment 6

[0154] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned new energy vehicle charging cable insulation performance degradation warning device embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0155] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0156] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0157] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0158] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0159] The above are only preferred embodiments of the present application and the technical principles used. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions that can be made by those skilled in the art will not deviate from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A warning device for insulation degradation of charging cables of new energy vehicles, characterized in that: The device comprises: An insulation resistance acquisition module is used to collect the insulation resistance value of the charging cable of the new energy vehicle according to a preset period; a leakage current collection module, configured to collect the leakage current of the charging cable during the operation of the charging cable when the insulation resistance value is less than a set ratio of a preset standard value; an insulation performance degradation identification module, used to identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded; The early warning module is used to generate early warning information and terminate the charging state of the charging cable for the new energy vehicle.

2. The device for warning the insulation performance degradation of the charging cable of a new energy vehicle according to claim 1, characterized in that: The insulation resistance acquisition module is specifically used for: Acquiring physical parameters of the charging cable; determining a DC test voltage to be applied to the charging cable according to the physical parameter; Applying the DC test voltage to the charging cable according to a preset period to collect a micro current of the charging cable; The insulation resistance value of the charging cable is determined according to the DC test voltage and the micro-current.

3. The warning device for insulation degradation of charging cables of new energy vehicles according to claim 2, characterized in that: The insulation resistance acquisition module is also specifically used for: After removing the DC test voltage applied to the charging cable, obtaining comparative current data of the insulation layer of the charging cable; After collecting the microcurrent of the charging cable, performing noise elimination processing on the microcurrent using the comparison current data, and filtering the noise elimination result to obtain a calculated current; An insulation resistance value of the charging cable is determined according to the DC test voltage and the calculated current.

4. The device for warning the insulation performance degradation of a charging cable of a new energy vehicle according to claim 1, characterized in that: The insulation performance degradation identification module comprises: a safety threshold selection unit, configured to obtain a safety threshold corresponding to the charging cable; The comparison unit is used to identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded.

5. The warning device for insulation degradation of charging cables of new energy vehicles according to claim 4, characterized in that: The safety threshold selection unit is specifically used to: Acquiring physical parameters of the charging cable; According to the physical parameter, a safety threshold corresponding to the charging cable is selected from a memory according to a preset corresponding rule.

6. The device for warning the insulation performance degradation of a charging cable of a new energy vehicle according to claim 1, characterized in that: The insulation performance degradation identification module is also used for: It is identified whether the detected increase amplitude of the leakage current exceeds a set amplitude threshold, and if so, it is determined that the insulation performance of the charging cable is degraded.

7. The device for warning the insulation performance degradation of a charging cable of a new energy vehicle according to claim 6, characterized in that: The insulation performance degradation identification module is specifically used for: Obtaining the detected leakage current and drawing a leakage current curve; Identifying distortion points in the leakage current curve, filtering out the distortion points, and obtaining a smooth curve; The rising trend of the gentle curve is calculated according to the first time window length and the second time window length, and when the rising amplitude corresponding to the first time window length exceeds a set first amplitude threshold, and the rising amplitude corresponding to the second time window length exceeds a set second amplitude threshold, it is determined that the insulation performance of the charging cable is degraded.

8. A warning method for insulation degradation of a charging cable of a new energy vehicle, characterized in that: The method comprises: Collect the insulation resistance value of the charging cable of the new energy vehicle according to the preset period; When the insulation resistance value is less than a set ratio of a preset standard value, collecting a leakage current of the charging cable during operation of the charging cable; Identify whether the detected leakage current exceeds a set safety threshold, and if so, determine that the insulation performance of the charging cable is degraded; Generate a warning message and terminate the charging state of the new energy vehicle by the charging cable.

9. The method for early warning of insulation performance degradation of a charging cable of a new energy vehicle according to claim 8, characterized in that: The insulation resistance value of the charging cable of the new energy vehicle is collected according to the preset period, including: Acquiring physical parameters of the charging cable; determining a DC test voltage to be applied to the charging cable according to the physical parameter; Applying the DC test voltage to the charging cable according to a preset period to collect a micro current of the charging cable; The insulation resistance value of the charging cable is determined according to the DC test voltage and the micro-current.

10. An electronic device, characterized in that: It includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method for warning the insulation performance degradation of the charging cable of a new energy vehicle as described in any one of claims 8 to 9 are implemented.

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