Insulation fault processing method and device for high-voltage battery electric vehicle and storage medium

Abstract

The application provides a high-voltage battery-powered vehicle insulation fault processing method, device and storage medium. The insulation fault processing method comprises the following steps: acquiring the insulation resistance between the positive side and the negative side of the high-voltage system of the vehicle and the vehicle body ground respectively; when the insulation resistance of one side is lower than a preset threshold value, and the insulation resistance of the other side is not lower than the preset threshold value, the vehicle is prohibited from being powered by high voltage. The high-voltage battery-powered vehicle insulation fault processing method, device and storage medium provided by the application not only comprehensively judge the insulation resistance of both sides of the high-voltage system of the vehicle, but also evaluate the insulation resistance of the other side in the case that the insulation resistance of one side is lower than the preset threshold value, thereby avoiding the case that the vehicle is powered by high voltage as long as the insulation fault occurs, optimizing the processing strategy of the insulation fault, and improving the vehicle experience of the user.

Description

Technical Field

[0001] This application relates to the field of insulation treatment technology, specifically to a method, apparatus, and storage medium for handling insulation faults in high-voltage battery-powered vehicles. Background Technology

[0002] With the increasing sales of new energy vehicles year by year, the number of vehicles unable to run due to insulation failures is also increasing. To regulate the development of new energy vehicles, the state has issued safety standards for insulation resistance and insulation monitoring: under maximum operating voltage, the insulation resistance of DC circuits should not be less than 100Ω / V, and that of AC circuits should not be less than 500Ω / V. If DC and AC Class B voltage circuits are connected together conductively, the insulation resistance should meet the requirement of not less than 500Ω / V. In practical applications, fault determination is made by measuring either the insulation resistance Rp (positive to ground) or Rn (negative to ground) of the vehicle. This value can be the parallel value of the two or the smaller of the two values, thus enabling timely detection of insulation faults and the implementation of protective measures, as in the case of high voltage.

[0003] In the process of conceiving and implementing this application, the inventors discovered at least the following problems: when the insulation resistance of one pole side is lower than the threshold, but the insulation performance of the other side is good, the whole vehicle will take high voltage protection measures, causing the vehicle to be unable to drive due to the malfunction, the vehicle will lose power and break down in the middle of the road, causing serious traffic congestion, or even traffic accidents, which can easily cause dissatisfaction and complaints from users.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the Invention

[0005] To alleviate the above problems, this application provides a method for handling insulation faults in high-voltage battery-powered vehicles.

[0006] In one aspect, this application provides a method for handling insulation faults in a high-voltage battery-powered vehicle, specifically including:

[0007] Obtain the insulation resistance values ​​of the positive and negative sides of the vehicle's high-voltage system to the vehicle body ground, respectively;

[0008] When the insulation resistance on one side is lower than a preset threshold, while the insulation resistance on the other side is not lower than the preset threshold, the vehicle is prohibited from being subjected to high voltage.

[0009] Optionally, the preset threshold in the insulation fault handling method for the high-voltage battery-powered vehicle includes a first preset threshold and a second preset threshold, wherein the first preset threshold is greater than the second preset threshold, and the step of prohibiting the vehicle from being subjected to high voltage when the insulation resistance on one side is lower than the preset threshold while the insulation resistance on the other side is not lower than the preset threshold includes:

[0010] When the insulation resistance on one side is lower than the second preset threshold, while the insulation resistance on the other side is not lower than the first preset threshold, the speed of the vehicle is reduced to a first speed, and / or the power of the vehicle is reduced to a first power.

[0011] Optionally, the insulation fault handling method for the high-voltage battery-powered vehicle includes the following step of prohibiting the vehicle from being powered by high voltage when the insulation resistance on one side is lower than a preset threshold while the insulation resistance on the other side is not lower than the preset threshold:

[0012] When the insulation resistance on one side is lower than the second preset threshold, and the insulation resistance on the other side is not lower than the second preset threshold and is lower than the first preset threshold, the vehicle speed is reduced to a second speed, and / or the vehicle power is reduced to a second power, wherein the second speed is less than the first speed and the second power is less than the first power.

[0013] Optionally, the insulation fault handling method for the high-voltage battery-powered vehicle includes the following steps before performing the step of separately obtaining the insulation resistance values ​​of the positive and negative sides of the vehicle's high-voltage system to the vehicle body ground:

[0014] Obtain the vehicle's driving speed and / or driving power.

[0015] Optionally, the insulation fault handling method for the high-voltage battery-powered vehicle further includes:

[0016] In response to the insulation resistance values ​​on both sides being lower than the preset threshold, the vehicle is prohibited from being connected to high voltage.

[0017] On the other hand, this application also provides an insulation fault handling device, specifically including: a high-voltage battery pack, an insulation resistance detection circuit, a voltage sampling module, and a control module;

[0018] The high-voltage battery pack is used to supply power to the insulation resistance detection circuit.

[0019] The voltage sampling module is connected to the insulation resistance detection circuit and is used to obtain the insulation resistance value of the high-voltage battery pack to the vehicle ground.

[0020] The control module is connected to the voltage sampling module to implement the insulation fault handling method for high-voltage battery-powered vehicles as described above.

[0021] Optionally, the insulation resistance detection circuit in the insulation fault handling device includes: a first insulation resistance equivalent resistance and a second insulation resistance equivalent resistance;

[0022] The first equivalent insulation resistance and the second equivalent insulation resistance are connected in series on both sides of the high-voltage battery pack. The first equivalent insulation resistance is connected to the positive terminal of the high-voltage battery pack, and the second equivalent insulation resistance is connected to the negative terminal of the high-voltage battery pack. The common terminal of the first equivalent insulation resistance and the second equivalent insulation resistance is grounded.

[0023] Optionally, the insulation resistance detection circuit in the insulation fault handling device further includes: a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0024] The first capacitor and the second capacitor are connected in series on both sides of the high-voltage battery pack. The first capacitor is connected to the positive terminal of the high-voltage battery pack, and the second capacitor is connected to the negative terminal of the high-voltage battery pack. The common terminal of the first capacitor and the second capacitor is grounded.

[0025] The first resistor, the second resistor, the third resistor, and the fourth resistor are connected in series between the positive and negative terminals of the high-voltage battery pack, and the common terminal of the second resistor and the third resistor is grounded.

[0026] Optionally, the insulation resistance detection circuit in the insulation fault handling device further includes: a switching element; a first end of the switching element is connected to the common terminal of the first resistor and the second resistor, and a second end of the switching element is connected to the negative terminal of the high-voltage battery pack; the voltage sampling module is connected in parallel with the fourth resistor and is used to collect the first voltage when the switching element is closed and the second voltage when the switching element is open.

[0027] On the other hand, this application also provides a storage medium, specifically, the storage medium stores a computer program, which, when executed by a processor, implements the insulation fault handling method for high-voltage battery-powered vehicles as described above.

[0028] As described above, the insulation fault handling method, device and storage medium for high-voltage battery-powered vehicles provided in this application comprehensively judge the insulation resistance values ​​on both sides of the vehicle's high-voltage system. When the insulation resistance value on one side is lower than a preset threshold, the insulation resistance value on the other side is evaluated simultaneously. This avoids the situation of reducing the high voltage whenever an insulation fault occurs, optimizes the insulation fault handling strategy and improves the user's vehicle experience. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0030] Figure 1 This is a flowchart of an insulation fault handling method for a high-voltage battery-powered vehicle according to an embodiment of this application.

[0031] Figure 2 This is a structural diagram of an insulation fault handling device according to an embodiment of this application.

[0032] Figure 3 This is a circuit diagram of an insulation resistance detection circuit according to an embodiment of this application.

[0033] The realization of the objectives, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0035] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0036] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0037] To regulate the development of new energy vehicles, the state has issued a series of standards for them, including some safety-related standards such as GB 18384-2020 "Safety Requirements for Electric Vehicles". The requirements for insulation resistance and insulation monitoring in GB 18384 are as follows:

[0038] 5.1.4.1 Insulation resistance requirements

[0039] At maximum operating voltage, the insulation resistance of DC circuits should be no less than 100 Ω / V, and that of AC circuits should be no less than 500 Ω / V. If DC and AC Class B voltage circuits are conductively connected together, the insulation resistance should meet the requirement of no less than 500 Ω / V.

[0040] 5.1.4.2 Insulation resistance monitoring requirements

[0041] The vehicle should have an insulation resistance monitoring function and be able to pass the insulation monitoring function verification test in 6.2.3. When the vehicle's Class B voltage circuit is connected and not connected to an external power source, the device should be able to continuously or intermittently detect the insulation resistance value of the vehicle. When the insulation resistance value is less than the threshold specified by the manufacturer, the driver should be alerted by a clear signal (e.g., an audible or visual signal). The threshold specified by the manufacturer should not be lower than the requirements of 5.1.4.1.

[0042] In addition, the Shanghai local standard "DB31 / T 634-2020-Technical Specification for Operation Safety and Maintenance of Electric Passenger Vehicles" requires that when the insulation resistance of the whole vehicle is lower than 500Ω / V, in addition to alarm signals, the vehicle should also enter the protection mode, such as the following high voltage.

[0043] In summary, the standard requires that the vehicle provide the driver with a warning signal and take certain protective measures when a single-sided insulation fault occurs.

[0044] First Embodiment

[0045] On one hand, this application provides a method for handling insulation faults in high-voltage battery-powered vehicles. Figure 1 This is a flowchart of an insulation fault handling method for a high-voltage battery-powered vehicle according to an embodiment of this application.

[0046] Please see Figure 1 The methods for handling insulation faults in high-voltage battery-powered vehicles include:

[0047] S10: Obtain the insulation resistance values ​​of the positive and negative sides of the vehicle's high-voltage system to the vehicle ground.

[0048] For example, insulation testing can be achieved using a bridge circuit. Optionally, the bridge method integrates a relevant sampling circuit into the battery sampling system, and the battery manager can further calculate the insulation resistance of the entire vehicle using the data collected by the sampling circuit. The bridge method can calculate the insulation resistance to ground and the insulation resistance to ground.

[0049] S20: When the insulation resistance on one side is lower than the preset threshold, and the insulation resistance on the other side is not lower than the preset threshold, the vehicle is prohibited from being connected to high voltage.

[0050] Optionally, this application does not limit the size of the preset threshold, but selects an appropriate preset threshold size by comprehensively considering vehicle safety standards.

[0051] In this embodiment, the insulation fault handling method for high-voltage battery-powered vehicles comprehensively judges the insulation resistance values ​​on both sides of the high-voltage system of the vehicle. If the insulation resistance value on either side is lower than a preset threshold, the insulation resistance value on the other side is evaluated simultaneously. If the insulation resistance value on the other side can still support the operation of the high-voltage system, then the vehicle power is maintained. This avoids the situation where the high voltage is deactivated whenever an insulation fault occurs, which facilitates timely handling of faulty vehicles by users, optimizes the insulation fault handling strategy, and improves the user's driving experience.

[0052] In one embodiment, the preset threshold includes a first preset threshold and a second preset threshold, wherein the first preset threshold is greater than the second preset threshold.

[0053] For example, this application does not limit the size of the first preset threshold and the second preset threshold. Taking into account vehicle safety standards, the first preset threshold can be 500Ω / V and the second preset threshold can be 100Ω / V.

[0054] The insulation fault handling method for high-voltage battery-powered vehicles includes the following steps in S20: When the insulation resistance on one side is lower than a preset threshold while the insulation resistance on the other side is not lower than a preset threshold, prohibiting the vehicle from being connected to high voltage includes:

[0055] S21: When the insulation resistance on one side is lower than the second preset threshold, and the insulation resistance on the other side is not lower than the first preset threshold, reduce the vehicle speed to the first speed and / or reduce the vehicle power to the first power.

[0056] In this embodiment, the insulation fault handling method for high-voltage battery-powered vehicles can simultaneously assess the insulation resistance on the other side when the insulation resistance on one side is lower than the second preset threshold. If the insulation resistance on the other side is much higher than the second preset threshold, i.e. not lower than the first preset threshold, the user can be alerted while the vehicle is allowed to travel at a limited power or speed without forcing the vehicle to reduce the high voltage.

[0057] In one embodiment, the insulation fault handling method for a high-voltage battery-powered vehicle includes the following step in S20: when the insulation resistance on one side is lower than a preset threshold while the insulation resistance on the other side is not lower than a preset threshold, prohibiting the vehicle from operating at high voltage:

[0058] S22: When the insulation resistance on one side is lower than the second preset threshold, and the insulation resistance on the other side is not lower than the second preset threshold and is lower than the first preset threshold, reduce the vehicle speed to the second speed and / or reduce the vehicle power to the second power.

[0059] Optionally, the second speed is less than the first speed, and the second power is less than the first power.

[0060] In this embodiment, the insulation fault handling method for high-voltage battery-powered vehicles can simultaneously assess the insulation resistance on the other side when the insulation resistance on one side is lower than the second preset threshold. If the insulation resistance on the other side is slightly higher than the second preset threshold, i.e. lower than the first preset threshold, the system can alert the user without forcing the vehicle to reduce the high voltage, allowing the user to further limit the power or speed, and drive at a second speed lower than the first speed or a second power lower than the first power.

[0061] In one embodiment, the insulation fault handling method for a high-voltage battery-powered vehicle includes the following steps before performing S10: obtaining the insulation resistance values ​​of the positive and negative sides of the vehicle's high-voltage system to the vehicle body ground:

[0062] S11: Obtain the vehicle's speed and / or power.

[0063] For example, after obtaining the vehicle's driving speed and / or driving power, the vehicle is then appropriately limited in speed and power based on its initial driving speed and / or driving power. Optionally, the speed and / or power can be smoothly switched.

[0064] In one embodiment, the insulation fault handling method for high-voltage battery-powered vehicles further includes:

[0065] S30: In response to the insulation resistance values ​​on both sides being lower than the preset threshold, the vehicle is prohibited from being connected to high voltage.

[0066] In this embodiment, the insulation fault handling method for high-voltage battery-powered vehicles can simultaneously assess the insulation resistance on the other side when the insulation resistance on one side is lower than a second preset threshold. If the insulation resistance on the other side is also lower than the second preset threshold, it indicates that neither the positive nor negative side of the high-voltage system can support vehicle power. Optionally, while alerting the user, the vehicle can be forced to exit the high-voltage system to ensure road safety.

[0067] Second Embodiment

[0068] On the other hand, this application also provides an insulation fault handling device. Figure 2 This is a structural diagram of an insulation fault handling device according to an embodiment of this application.

[0069] Please see Figure 2 In one embodiment, the insulation fault device includes: a high-voltage battery pack 10, an insulation resistance detection circuit 20, a voltage sampling module 30, and a control module 40.

[0070] The high-voltage battery pack 10 supplies power to the insulation resistance detection circuit 20. The voltage sampling module 30 is connected to the insulation resistance detection circuit 20 and is used to obtain the insulation resistance value of the high-voltage battery pack 10 to the vehicle ground. The control module 40 is connected to the voltage sampling module 30 to implement the insulation fault handling method for high-voltage battery-powered vehicles as described above.

[0071] In this embodiment, the control module 40 in the insulation fault handling device evaluates the insulation resistance values ​​of both sides of the high-voltage battery pack 10 to the vehicle ground based on the insulation resistance value detection circuit 20 and the voltage sampling module 30. If the insulation resistance value on one side is lower than a preset threshold, the control module 40 simultaneously evaluates the insulation resistance value on the other side. This avoids the situation where high voltage is applied whenever an insulation fault occurs, optimizes the insulation fault handling strategy, and improves the user's vehicle experience.

[0072] Figure 3 This is a circuit diagram of an insulation resistance detection circuit according to an embodiment of this application.

[0073] Please refer to the following: Figure 2 and Figure 3 In one embodiment, the insulation resistance detection circuit 20 in the insulation fault handling device includes: a first insulation resistance equivalent resistance Rp and a second insulation resistance equivalent resistance Rn.

[0074] The first equivalent insulation resistance Rp and the second equivalent insulation resistance Rn are connected in series on both sides of the high-voltage battery pack 10. The first equivalent insulation resistance Rp is connected to the positive terminal of the high-voltage battery pack 10, and the second equivalent insulation resistance Rn is connected to the negative terminal of the high-voltage battery pack 10. The common terminal of the first equivalent insulation resistance Rp and the second equivalent insulation resistance Rn is grounded.

[0075] Please continue reading. Figure 3 In one embodiment, the insulation resistance detection circuit 20 further includes: a first capacitor Cp, a second capacitor Cn, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.

[0076] In this configuration, the first capacitor Cp and the second capacitor Cn are connected in series across the two sides of the high-voltage battery pack 10. The first capacitor Cp is connected to the positive terminal of the high-voltage battery pack 10, and the second capacitor Cn is connected to the negative terminal of the high-voltage battery pack 10. The common terminal of the first capacitor Cp and the second capacitor Cn is grounded. The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are connected in series between the positive and negative terminals of the high-voltage battery pack 10. The common terminal of the second resistor R2 and the third resistor R3 is grounded.

[0077] Please continue reading. Figure 3 In one embodiment, the insulation resistance detection circuit further includes a switch K. A first terminal of the switch K is connected to the common terminal of a first resistor R1 and a second resistor R2, and a second terminal of the switch K is connected to the negative terminal of the high-voltage battery pack 10. A voltage sampling module 30 is connected in parallel with a fourth resistor R4 to collect a first voltage U1 when the switch K is closed and a second voltage U2 when the switch K is open.

[0078] For example, when switch K is closed, equation one is obtained:

[0079] U1 / R2+U1 / (R3+R4)+U1 / Rn=(U-U1) / Rp;

[0080] When switch K is open, equation two is obtained:

[0081] U2 / Rn+U2 / (R3+R4)=(U-U2) / Rp+(U-U2) / (R1+R2);

[0082] The equivalent resistance Rp and equivalent resistance Rn of the first insulation resistance can be obtained from the above equations.

[0083] In this embodiment, the insulation detection circuit constructs two balanced circuits through the on and off actions of the switch K, and further derives two sets of linear equations in two variables from these two balanced circuits. Based on these equations, the equivalent resistance Rp and the equivalent resistance Rn of the first insulation resistance of the high-voltage system can be calculated.

[0084] Third Embodiment

[0085] Please refer to Figure 3 In one embodiment of a high-voltage system insulation resistance detection system for new energy vehicles, the new energy vehicle will detect the insulation resistance of the high-voltage system in real time through a detection circuit.

[0086] In the high-voltage system of new energy vehicles, there is an objective insulation resistance value Rp between the high-voltage positive terminal and the vehicle ground, and an insulation resistance value Rn between the high-voltage negative terminal and the vehicle ground. Figure 3The detection method shown is the bridge method, which is also the method used for insulation testing in the vast majority of existing new energy vehicles. Its hardware circuitry is integrated into the battery system. Two balanced circuits are constructed through the on and off actions of switch K, and these two balanced circuits further derive two systems of linear equations in two variables. Solving these equations allows for the calculation of the insulation resistance Rp between the positive terminal of the high-voltage system and the vehicle ground, and the insulation resistance Rn between the negative terminal and the vehicle ground.

[0087] Typically, after calculating Rp and Rn, the system will use an algorithm to further determine the smaller value of Rp and Rn, or the parallel value of Rp and Rn, and label this value as R.

[0088] Optionally, the standard defines two insulation alarm thresholds: 500Ω / V and 100Ω / V. At the vehicle level, when R falls below the preset threshold and meets preset conditions, the vehicle will trigger an insulation alarm and take corresponding high-voltage protection measures.

[0089] Typical failure scenarios are as follows:

[0090] ① When a vehicle is traveling on a highway, an insulation failure occurs, causing the vehicle to lose power and break down in the middle of the road, leading to traffic accidents such as rear-end collisions.

[0091] ② When a vehicle is traveling in a one-way lane or waiting to pass through a traffic light, an insulation failure occurs, causing the vehicle to lose power and break down in the middle of the road, resulting in severe traffic congestion.

[0092] For both scenarios, while meeting standards, the insulation fault handling strategy is optimized to improve the customer's driving experience. Based on the vehicle's existing hardware and software capabilities—namely, the ability to simultaneously sample and calculate the positive-to-ground resistance Rp and the negative-to-ground resistance Rn—the insulation resistance on the other side can be evaluated simultaneously even when the insulation resistance on one side is below the threshold.

[0093] ①If the insulation resistance on the other side is much higher than the alarm threshold, the user will be alerted by an alarm, but there is no need to force the high voltage down. The user can be allowed to drive with limited power or speed.

[0094] ② If the insulation resistance on the other side is slightly higher than the alarm threshold, the user will be alerted by an alarm, but there is no need to force the high voltage down. The user can be allowed to further limit the power or vehicle speed.

[0095] ③If the insulation resistance on the other side is also lower than the alarm threshold, then the existing high-voltage protection strategy shall be followed.

[0096] Compared to the previous strategy of applying high voltage to any insulation fault on only one side, this new strategy leverages existing hardware circuitry and software processing capabilities to comprehensively assess the resistance values ​​on both sides. It then applies a tiered approach to insulation faults of varying severity, avoiding the indiscriminate application of high voltage for every insulation fault. Users can then safely move their vehicles to a designated area or repair shop if the insulation fault is not too severe, making the process more user-friendly and significantly improving user satisfaction.

[0097] Fourth embodiment

[0098] On the other hand, this application also provides a storage medium, specifically, a computer program stored on the storage medium, which, when executed by a processor, implements the insulation fault handling method for high-voltage battery-powered vehicles as described above.

[0099] As described above, the insulation fault handling method, device, and storage medium for high-voltage battery-powered vehicles provided in this application leverage existing hardware circuitry and software processing capabilities to comprehensively assess the insulation resistance values ​​on both sides of the high-voltage system. This allows for tiered handling of insulation faults of varying degrees, avoiding the need to de-energize the vehicle at the first sign of an insulation fault. Users can then safely drive the vehicle to a safe area or repair shop when the insulation fault is not too severe, making the process more user-friendly and significantly improving user satisfaction.

[0100] It should be noted that step designations such as S10 and S20 are used in this application for the purpose of more clearly and concisely describing the corresponding content, and do not constitute a substantial limitation on the order. In specific implementation, those skilled in the art may execute S20 first and then S10, etc., but these should all be within the protection scope of this application.

[0101] In the embodiments of the insulation fault handling device and storage medium provided in this application, all the technical features of any of the above-described method embodiments may be included. The extended and explanatory content of the specification is basically the same as that of the embodiments of the above methods, and will not be repeated here.

[0102] This application also provides a computer program product, which includes computer program code. When the computer program code is run on a computer, it causes the computer to perform the methods described in the various possible implementations above.

[0103] This application also provides a chip, including a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a device with the chip installed performs the methods described in the various possible implementations above.

[0104] It is understood that the above scenarios are merely examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of this application. The technical solutions of this application can also be applied to other scenarios. For example, as those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0105] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0106] The steps in the method of this application embodiment can be adjusted, combined, or deleted according to actual needs.

[0107] The units in the device of this application embodiment can be merged, divided, and deleted according to actual needs.

[0108] In this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions are generally described in detail only when they appear for the first time. When they appear again, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions that are not described in detail later can be referred to their previous relevant detailed descriptions.

[0109] In this application, the descriptions of the various embodiments have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0110] The technical features of the present application can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0111] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for handling insulation faults in high-voltage battery-powered vehicles, characterized in that, include: Obtain the insulation resistance values ​​of the positive and negative sides of the vehicle's high-voltage system to the vehicle body ground, respectively; When the insulation resistance on one side is lower than a preset threshold, and the insulation resistance on the other side is not lower than the preset threshold, the vehicle is prohibited from being subjected to high voltage. The preset threshold includes a first preset threshold and a second preset threshold, wherein the first preset threshold is greater than the second preset threshold. The step of prohibiting the vehicle from applying high voltage when the insulation resistance on one side is lower than the preset threshold while the insulation resistance on the other side is not lower than the preset threshold includes: When the insulation resistance on one side is lower than the second preset threshold, and the insulation resistance on the other side is not lower than the first preset threshold, the speed of the vehicle is reduced to a first speed, and / or the power of the vehicle is reduced to a first power. When the insulation resistance on one side is lower than the second preset threshold, and the insulation resistance on the other side is not lower than the second preset threshold and is lower than the first preset threshold, the vehicle speed is reduced to a second speed, and / or the vehicle power is reduced to a second power, wherein the second speed is less than the first speed and the second power is less than the first power.

2. The insulation fault handling method for high-voltage battery-powered vehicles as described in claim 1, characterized in that, Before the step of separately obtaining the insulation resistance values ​​of the positive and negative sides of the vehicle's high-voltage system to the vehicle body ground, the following steps are included: Obtain the vehicle's driving speed and / or driving power.

3. The insulation fault handling method for high-voltage battery-powered vehicles as described in claim 1, characterized in that, Also includes: In response to the insulation resistance values ​​on both sides being lower than the preset threshold, the vehicle is prohibited from being connected to high voltage.

4. An insulation fault handling device, characterized in that, include: High-voltage battery pack, insulation resistance detection circuit, voltage sampling module, and control module; The high-voltage battery pack is used to supply power to the insulation resistance detection circuit. The voltage sampling module is connected to the insulation resistance detection circuit and is used to obtain the insulation resistance value of the high-voltage battery pack to the vehicle ground. The control module is connected to the voltage sampling module to implement the insulation fault handling method for high-voltage battery-powered vehicles as described in any one of claims 1-3.

5. The insulation fault handling device as described in claim 4, characterized in that, The insulation resistance detection circuit includes: a first insulation resistance equivalent resistance and a second insulation resistance equivalent resistance; The first equivalent insulation resistance and the second equivalent insulation resistance are connected in series on both sides of the high-voltage battery pack. The first equivalent insulation resistance is connected to the positive terminal of the high-voltage battery pack, and the second equivalent insulation resistance is connected to the negative terminal of the high-voltage battery pack. The common terminal of the first equivalent insulation resistance and the second equivalent insulation resistance is grounded.

6. The insulation fault handling device as described in claim 5, characterized in that, The insulation resistance detection circuit further includes: a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor; The first capacitor and the second capacitor are connected in series on both sides of the high-voltage battery pack. The first capacitor is connected to the positive terminal of the high-voltage battery pack, and the second capacitor is connected to the negative terminal of the high-voltage battery pack. The common terminal of the first capacitor and the second capacitor is grounded. The first resistor, the second resistor, the third resistor, and the fourth resistor are connected in series between the positive and negative terminals of the high-voltage battery pack, and the common terminal of the second resistor and the third resistor is grounded.

7. The insulation fault handling device as described in claim 6, characterized in that, The insulation resistance detection circuit further includes: a switching element; a first end of the switching element is connected to the common terminal of the first resistor and the second resistor, and a second end of the switching element is connected to the negative terminal of the high-voltage battery pack; the voltage sampling module is connected in parallel with the fourth resistor and is used to collect a first voltage when the switching element is closed and a second voltage when the switching element is open.

8. A storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the insulation fault handling method for high-voltage battery-powered vehicles as described in any one of claims 1-3.

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