Insulation fault position detection method, device, medium and vehicle

Abstract

The application relates to the technical field of circuit control, and provides an insulation fault detection method, device, medium and vehicle, aiming to solve the problem that a single calibrated threshold value evaluation cannot determine whether an insulation value represents insulation fault, the method comprising the following steps: measuring an insulation resistance value, obtaining parameter values of a first parameter group and a second parameter group; obtaining a first reference resistance value according to the first parameter group and a second reference resistance value according to the second parameter group; when the insulation resistance value is smaller than the first reference resistance value and the insulation resistance value is smaller than the second reference resistance value, judging whether the battery pack has insulation fault according to the state of the battery pack and the insulation resistance value change. The method provides comprehensive judgment by using multiple reference values, and different working conditions during detection are excluded, so that misjudgment is avoided.

Description

Technical Field

[0001] This application relates to the field of circuit control technology, specifically providing an insulation fault detection method, device, medium, and vehicle. Background Technology

[0002] Electric vehicles have high requirements for electrical insulation, especially the power battery pack. Deterioration in insulation can lead to short circuits and compromise vehicle safety. Conventional vehicle insulation testing circuits are directly affected by numerous factors, resulting in significant fluctuations in resistance values ​​under different operating conditions, which greatly complicates the monitoring and diagnosis of power battery pack insulation. Evaluating insulation values ​​based on a single calibrated threshold to indicate whether an insulation fault has occurred is inherently uncertain.

[0003] Accordingly, there is a need in the field for a new insulation fault detection solution to address the above problems. Summary of the Invention

[0004] In order to overcome the above-mentioned deficiencies, this application is made to provide a solution, or at least a partial solution, to the technical problem of how to more accurately detect insulation faults in electric vehicles.

[0005] In a first aspect, this application provides an insulation fault detection method, the insulation fault detection method comprising: measuring an insulation resistance value, obtaining parameter values ​​of a first parameter group and a second parameter group; obtaining a first reference resistance value based on the first parameter group, and obtaining a second reference resistance value based on the second parameter group; when the insulation resistance value is less than the first reference resistance value and the insulation resistance value is less than the second reference resistance value, determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value.

[0006] In one technical solution of the above-mentioned insulation fault detection method, the first parameter set includes the cumulative charging time, cumulative discharging time, cumulative resting time, battery health (SOH), and battery temperature of the battery pack; the second parameter set includes the cumulative charge and discharge amount of the battery pack, battery health (SOH), and battery temperature.

[0007] In one technical solution of the above-mentioned insulation fault detection method, determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value includes: when the battery pack is in a first state, if the insulation resistance value is detected to be greater than or equal to the first reference resistance value or the insulation resistance value is greater than or equal to the second reference resistance value within a preset time period, it is determined that the battery pack does not have an insulation fault, and the battery pack is marked with an abnormal recovery identifier.

[0008] In one technical solution of the above-mentioned insulation fault detection method, determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value further includes: when the battery pack is in a first state and there is an abnormal recovery indicator in the battery pack within a first time period before the insulation fault detection method is executed, it is determined that the battery pack does not have an insulation fault.

[0009] In one technical solution of the above-mentioned insulation fault detection method, determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value further includes: when the battery pack is in a first state and the insulation resistance is not a constant value when the power of the first state changes within a preset time period, it is determined that the battery pack does not have an insulation fault; when the battery pack is in the first state and the insulation resistance value is a constant value when the power of the first state changes within a preset time period, it is determined that the battery pack has an insulation fault.

[0010] In one technical solution of the above-mentioned insulation fault detection method, determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value includes: when the battery pack is in a second state, and the insulation resistance value is detected to be greater than or equal to the first reference resistance value or greater than or equal to the second reference resistance value within a preset time period, it is determined that the battery pack does not have an insulation fault, and the battery pack is marked with an abnormal recovery flag; when the battery pack is in the second state, and the insulation resistance value remains less than the first reference resistance value and less than the second reference resistance value within a preset time period, it is determined that the battery pack has an insulation fault.

[0011] In one technical solution of the above-mentioned insulation fault detection method, determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value further includes: when the battery pack is in the second state and the abnormal recovery indicator exists in the battery pack within a first time period before the insulation fault detection method is executed, it is determined that the battery pack does not have an insulation fault.

[0012] In one technical solution of the above-mentioned insulation fault detection method, determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value further includes: when the battery pack is in a second state and connected to an external device, if the insulation resistance value is less than the insulation fault threshold within a preset time period, an alarm signal is issued.

[0013] In one technical solution of the above-mentioned insulation fault detection method, the insulation fault detection method further includes: when the insulation resistance value is less than the first reference resistance value or the resistance value is less than the second reference resistance value, acquiring the status data of the battery pack.

[0014] In a second aspect, a control device is provided, comprising at least one processor and at least one storage device, the storage device being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the insulation fault location detection method described in any of the above-described technical solutions.

[0015] In a third aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored therein, the program codes being adapted to be loaded and run by a processor to perform the insulation fault location detection method described in any of the above-described technical solutions.

[0016] In a fourth aspect, a vehicle is provided, the vehicle including the control device described in the above-mentioned control device technical solution.

[0017] The above-described technical solutions of this application have at least one or more of the following beneficial effects:

[0018] In implementing the technical solution of this application, the insulation fault detection method of this application avoids the error of a single standard in insulation judgment. It not only provides multiple reference values ​​for comprehensive judgment, but also eliminates different working conditions during the test to avoid misjudgment. Attached Figure Description

[0019] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0020] Figure 1 This is a schematic diagram of the main steps of the battery pack insulation fault detection method according to this application;

[0021] Figure 2 This is a flowchart illustrating the steps of another embodiment of the battery pack insulation fault detection method according to this application;

[0022] Figure 3 This is a flowchart illustrating the steps of another embodiment of the battery pack insulation fault detection method according to this application;

[0023] Figure 4 This is a schematic diagram of the main steps of the battery pack insulation fault detection method according to this application. Detailed Implementation

[0024] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0025] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0026] like Figure 1 The methods for detecting insulation faults in battery packs include:

[0027] Step 1: Measure the insulation resistance value to obtain the parameter values ​​of the first parameter group and the second parameter group. In this step, the insulation resistance value can be measured using an insulation sampling circuit installed in the battery pack to detect the insulation resistance at the battery pack terminals. Commonly used circuits include, for example, the bridge method.

[0028] Step 2: Obtain two different reference resistor values ​​based on two different parameter sets.

[0029] Specifically, the first reference resistance value is obtained according to the first parameter group, and the second reference resistance value is obtained according to the second parameter group; the first parameter group contains multiple different parameters, and the second parameter group also contains multiple different parameters, and there should be at least one different parameter between the first parameter group and the second parameter group.

[0030] Specifically, the scheme for obtaining the first reference resistance value of the first parameter group includes: establishing a multi-dimensional array based on the values ​​of different parameters stored in the cloud data platform and the measured insulation resistance value, using a multi-dimensional lookup table method to approximate the numerical values, or calculating the value by fitting a smooth curve to the multi-dimensional array and using an interpolation formula.

[0031] Furthermore, the multidimensional array is derived by summarizing and filtering the values ​​of different parameters of the power battery pack in the cloud data platform and the measured insulation resistance values. Specifically, the battery pack connected to the cloud data platform will transmit the collected values ​​of different parameters and the measured actual resistance values ​​to the platform in real time. For different actual resistance values, the parameters belonging to the first parameter group are summarized, and data confidence intervals are set.

[0032] The method for obtaining the second reference resistance value using the second parameter group is similar to that described above. Specifically, the data screening criteria used may differ. However, the biggest difference between the two is that there should be at least one different parameter between the first parameter group and the second parameter group.

[0033] The two reference resistance values ​​obtained above will be used to compare with the insulation resistance value measured in real time, and the comparison results will be used to confirm whether there is an insulation fault.

[0034] Step 3: When the insulation resistance value is less than the first reference resistance value and less than the second reference resistance value, the diagnostic stage begins. During the diagnostic stage, the battery pack status and insulation resistance value changes are used to determine whether there is an insulation fault in the battery pack.

[0035] Specifically, the battery is considered to have a potential insulation fault only when the insulation resistance value is simultaneously less than both the first reference resistance value and the second reference resistance value, so as to further determine whether the battery has an insulation fault.

[0036] Specifically, in this step, the change in insulation resistance value will be continuously observed. For example, whether the insulation resistance value recovers within a preset time period, or whether other phenomena that can rule out the existence of insulation faults appear. In particular, the phenomena that can be identified as eliminating insulation faults are different depending on the current usage status of the battery pack.

[0037] Compared to existing technologies, the insulation fault detection method in the above embodiments uses the results of two different models as standards for the detected insulation resistance values, avoiding the variable differences of a single standard. Furthermore, in subsequent judgment processes, the current state of the battery pack is comprehensively considered, and the insulation resistance values ​​measured in real time are continuously compared with the results of the two models. Changes in the comparison results are used to impose stricter limitations on insulation faults.

[0038] Specifically, the first parameter group includes cumulative charging time, cumulative discharging time, cumulative resting time, battery health (SOH), and battery temperature; the second parameter group includes the cumulative charge and discharge amount of the battery pack, battery health (SOH), and battery temperature.

[0039] The cumulative charging time and cumulative discharging time of a battery pack represent the total time the battery pack has received external power input and output power in various forms. The cumulative idle time of the battery pack is the total time the battery pack has not over-discharged any connected electrical equipment. Battery health (SOH) refers to the ratio of the battery's current capacity to its initial full capacity. Battery temperature is measured by a temperature sensor within the battery pack during this insulation fault detection. The cumulative charge / discharge amount is the total amount of electrical energy released by the battery pack.

[0040] Furthermore, when the battery pack undergoes any insulation fault detection method according to this invention, the values ​​of the first and second parameter groups, such as the cumulative resting time, will not differ significantly before and after. Therefore, during a single insulation fault detection, the first and second reference resistance values ​​can be constant reference values, i.e., the first and second reference resistance values ​​obtained for the first time based on the first and second parameter groups in this detection are used. However, considering the overall lifespan of the battery pack, the first and second parameter groups change between different insulation fault detection methods: the obtained first and second parameter groups will differ, and consequently, the first and second reference resistance values ​​obtained from the first and second parameter group values ​​will also change accordingly. Therefore, neither the first nor the second reference resistance value will be consistently large or small; that is, the magnitude of the first and second reference resistance values ​​is uncertain. Therefore, the smaller value between the first and second reference resistance values ​​cannot be compared solely using the reference resistance values.

[0041] It should be understood that although the first and second reference resistance values ​​can be constant reference values ​​when performing an insulation fault detection method, if necessary, the first and second reference resistance values ​​can also be obtained based on the real-time values ​​of the first and second parameter groups, or at certain time intervals. This approach takes into account the possibility that the values ​​of the first and second parameter groups may change during the detection process, and the first and second reference resistance values ​​will also be adjusted accordingly. This approach will result in more accurate judgment results.

[0042] As one embodiment of the present invention, such as Figure 2 As shown, during the diagnostic phase, the battery pack is in the first state. If, within a preset time period, the insulation resistance value is detected to be greater than or equal to the first reference resistance value or the resistance value is greater than or equal to the second reference resistance value, it is determined that the battery pack does not have an insulation fault.

[0043] In the first state, if the insulation resistance value is less than the first reference resistance value and less than the second reference resistance value within a finite time, the state is restored. The restoration is indicated by the detection of a state where at least one of the reference resistance values ​​is greater than or equal to the first reference resistance value, which means that the insulation fault of the battery pack is considered to be eliminated; if it is not restored, the insulation fault of the battery pack is considered to exist.

[0044] As an embodiment of the present invention, when a state reverting from one where the insulation resistance value is less than the first reference resistance value and less than the second reference resistance value occurs, even if the state reverts to one where the insulation resistance value is less than the first reference resistance value and less than the second reference resistance value again within a certain period after the insulation fault detection method of the present invention has been executed, this subsequent occurrence will not be considered an insulation fault. From the current detection perspective, if an insulation resistance value is detected to be less than the first reference resistance value and less than the second reference resistance value, and a state reverting from one where the insulation resistance value is less than the first reference resistance value and less than the second reference resistance value has occurred within a certain period of time, the possibility of an insulation fault occurring this time can be ruled out.

[0045] The duration of the aforementioned subsequent period and the preceding period is used as the first duration, which can be selected as 3 to 5 days.

[0046] Specifically, when identifying the above-mentioned recovery situation, the solution may be as follows: if, before executing the fault detection method of the present invention, the battery pack has an insulation resistance value greater than or equal to the first reference resistance value or a resistance value greater than or equal to the second reference resistance value within a preset time period for a first time period, the battery pack is identified as having no insulation fault and an abnormal recovery mark is made on the battery pack; in step three, if the battery pack has an abnormal recovery mark within the previous first time period, then the determination that the battery pack has no insulation fault is executed.

[0047] Optionally, the first state mentioned above refers to the vehicle's driving state, that is, the battery pack is in a power output state where it outputs energy to the outside to convert it into the vehicle's kinetic energy; it can be understood that the state in which the vehicle has started but the vehicle has not actually moved and other on-board equipment such as air conditioning is being used should also be considered as the first state.

[0048] As one embodiment of the present invention, such as Figure 2 As shown in step three, if the battery pack is in the first state during the diagnostic phase, and the insulation resistance value changes accordingly with the power of the battery pack's external discharge, that is, the insulation resistance value changes and is no longer a constant value, it can be determined that the battery pack does not have an insulation fault.

[0049] This change needs to be relatively significant and correlated with power changes, rather than being random. In other words, if the battery pack has an insulation fault, the resistance of the insulation fault will have a negligible impact on the insulation resistance value regardless of changes in the power discharged externally, and thus cannot alter the measured insulation resistance value. Therefore, if the insulation resistance value remains constant regardless of changes in the power discharged externally, it is considered that the measured insulation resistance value is dominated by the resistance of the insulation fault, and thus the battery pack has an insulation fault.

[0050] In summary, when a vehicle carrying a battery pack is in motion, if the insulation resistance value is simultaneously less than both the first and second reference resistance values, and this result remains unchanged over a subsequent period of time and the insulation resistance value does not change with changes in external power, then an insulation fault is confirmed in the battery pack.

[0051] As one embodiment of the present invention, such as Figure 3 As shown, it also includes: when the battery pack is in the second state, if the insulation resistance value is greater than or equal to the first reference resistance value or the resistance value is greater than or equal to the second reference resistance value within a preset time period, the battery pack does not have an insulation fault.

[0052] Similarly, in the second state, if the state where the insulation resistance value is less than the first reference resistance value and less than the second reference resistance value is restored within a finite time, and the state where at least one of the reference resistance values ​​is greater than or equal to occurs, the insulation fault of the battery pack is considered to be eliminated.

[0053] Similarly, in the second state, we can also refer to the situation where there was a recovery from a state where the insulation resistance value was less than the first reference resistance value and less than the second reference resistance value within a certain period of time, so as to rule out the possibility of an insulation fault occurring this time.

[0054] Specifically, similar to the first state, this step can be performed by marking an abnormal recovery flag and determining whether an abnormal recovery flag existed within the previous first time period.

[0055] Optionally, the second state described above is the stationary state of the vehicle, which is when the battery pack does not output electrical energy to move the vehicle. However, this second state also includes the battery pack being in a stationary charging state.

[0056] In summary, regardless of whether the vehicle is in motion or stationary, i.e., whether the battery pack is in the first or second state, the same judgment will be made if the insulation resistance value is detected to be less than both the first and second reference resistance values: if the insulation resistance value is greater than or equal to the first or second reference resistance value within a preset time period, or if the battery pack has an abnormal recovery indicator in the previous period, then it can be determined that the battery pack has no insulation fault.

[0057] As an embodiment of the present invention, in the second state, when the battery pack is connected to an external device and the insulation resistance threshold is greater than or equal to the insulation fault threshold and the change is relatively stable, it may be considered that...

[0058] Optional external devices include charging stations and external discharge devices.

[0059] As an example, if the insulation resistance value is continuously measured to be approximately 800kΩ ± 2kΩ and the insulation fault threshold is 300kΩ, then it is determined that the insulation resistance value being lower than the expected first reference resistance value and second reference resistance value is related to the insulation value of the connected external device itself, rather than a battery fault in the battery pack itself.

[0060] Conversely, in the second state, if the insulation resistance value is less than the insulation fault threshold, an early warning needs to be issued to notify the disconnection of external equipment for further judgment.

[0061] As an example, if the vehicle has an external charging / discharging device and the measured insulation resistance value is 100kΩ, which is less than the insulation fault threshold of 300kΩ, it is highly likely that there is an insulation fault in the battery pack. However, a warning should still be issued first, notifying the user to disconnect the charging device. By judging whether the situation of the insulation resistance value being less than the insulation fault threshold changes, the final determination can be made as to whether there is an insulation fault in the battery pack. After disconnecting the charging device, if the insulation resistance value is no longer simultaneously less than the first reference resistance value and the second reference resistance value, it is considered that the low insulation resistance value is caused by an insulation fault in the external device, thus ruling out an insulation fault in the battery pack.

[0062] like Figure 4 As shown, in step three, the diagnosis stage of judging whether there is an insulation fault in the battery pack based on the state of the battery pack and the change in the insulation resistance value is only limited to the case where the insulation resistance value is less than the first reference resistance value and the insulation resistance value is less than the second reference resistance value. Other cases are not limited. Therefore, step three also includes: when the insulation resistance value is less than the first reference resistance value or the resistance value is less than the second reference resistance value, a preparatory stage will be entered, and the state data of the battery pack will be obtained in the preparatory stage.

[0063] It should be understood that the state where the insulation resistance value is less than the first reference resistance value and less than the second reference resistance value is highly unlikely to occur suddenly. Usually, the state where the insulation resistance value is less than either the first or second reference resistance value will occur first. If this occurs, a preparatory stage is required. In this preparatory stage, some data needed for the step of determining whether the battery pack has an insulation fault will be acquired in advance, especially the battery pack's status data, such as whether the battery pack is currently in the first or second state, whether the battery pack is connected to an external device, and whether the battery pack has a recovery indicator. This is to prepare for the situation where the battery pack detects in step three that the insulation resistance value is less than the first and second reference resistance values ​​and enters the step of determining whether the battery pack has an insulation fault. In this way, the insulation fault can be directly determined using the acquired status data in this step.

[0064] In addition, such as Figure 4 As shown, if the insulation resistance value in step three is greater than or equal to the first reference resistance value and the insulation resistance value is greater than or equal to the second reference resistance value, then the battery pack is considered to have no insulation fault and everything is normal, and the testing process will maintain the status quo.

[0065] For the purposes of this invention, further judgments are primarily aimed at eliminating the possibility of insulation faults in the battery pack under different states. When the insulation resistance value is simultaneously lower than both the first and second reference resistance values, since the first and second reference resistance values ​​use two different sets of reference arrays, their confidence level is considered to be far higher than a comparison with a single threshold. Furthermore, both reference resistance values ​​are derived from a large amount of data within the platform, thus eliminating errors from purely experimental calibration and usage scenarios. Therefore, if the step of determining whether the battery pack has an insulation fault involves judging whether the battery pack has an insulation fault based on the battery pack's state and insulation resistance value—conditions not included in other variations of the embodiments of this invention—it should also be considered a modification based on this invention and thus within the scope of this invention.

[0066] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effect of this application, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of this application.

[0067] Those skilled in the art will understand that all or part of the processes in the method of the above-described embodiment can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content included in the computer-readable storage medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0068] Furthermore, this application also provides a control device. In one embodiment of the control device according to this application, the control device includes a processor and a storage device. The storage device can be configured to store a program for executing the insulation fault location detection method of the above-described method embodiments, and the processor can be configured to execute the program in the storage device. This program includes, but is not limited to, a program for executing the insulation fault location detection method of the above-described method embodiments. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The control device can be a control device device device comprising various electronic devices.

[0069] In the embodiments of this application, the control device may be a control device device comprising various electronic devices. In some possible implementations, the control device may include multiple storage devices and multiple processors. The program executing the insulation fault location detection method of the above method embodiments can be divided into multiple subroutines, each subroutine can be loaded and run by a processor to execute different steps of the insulation fault location detection method of the above method embodiments. Specifically, each subroutine can be stored in different storage devices, and each processor can be configured to execute programs in one or more storage devices to jointly implement the insulation fault location detection method of the above method embodiments, that is, each processor executes different steps of the insulation fault location detection method of the above method embodiments to jointly implement the insulation fault location detection method of the above method embodiments.

[0070] The aforementioned multiple processors can be processors deployed on the same device. For example, the aforementioned control device can be a high-performance device composed of multiple processors, and the aforementioned multiple processors can be processors configured on that high-performance device. Alternatively, the aforementioned multiple processors can also be processors deployed on different devices. For example, the aforementioned control device can be a server cluster, and the aforementioned multiple processors can be processors on different servers within the server cluster.

[0071] Furthermore, this application also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program for performing the insulation fault location detection method of the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described insulation fault location detection method. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a storage device device comprising various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0072] Furthermore, this application also provides a vehicle, in one embodiment of the vehicle according to this application, the vehicle may include a control device in the control device embodiment.

[0073] The relevant user personal information that may be involved in the various embodiments of this application is processed in strict accordance with the requirements of laws and regulations, following the principles of legality, legitimacy, and necessity, based on the reasonable purpose of the business scenario, and includes personal information that users actively provide or that is generated as a result of using the product / service, as well as personal information obtained with user authorization.

[0074] The personal information processed in this application will vary depending on the specific product / service scenario and will be based on the specific scenario in which the user uses the product / service. This may involve the user's account information, device information, driving information, vehicle information, or other related information. The applicant will treat the user's personal information and its processing with the utmost diligence.

[0075] This application attaches great importance to the security of users' personal information and has taken reasonable and feasible security protection measures that comply with industry standards to protect users' information and prevent unauthorized access, disclosure, use, modification, damage or loss of personal information.

[0076] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the device described in this application, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of both. Therefore, the number of modules shown in the figures is merely illustrative.

[0077] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of this application; therefore, the technical solutions after splitting or combining will fall within the protection scope of this application.

[0078] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method for detecting insulation faults in a battery pack, characterized in that, include: Measure the insulation resistance value and obtain the parameter values ​​of the first parameter group and the second parameter group; The first parameter group includes the battery pack's cumulative charging time, cumulative discharging time, cumulative resting time, battery health (SOH), and battery temperature; The second parameter group includes the cumulative charge / discharge amount of the battery pack, battery health (SOH), and battery temperature; The first reference resistance value is obtained according to the first parameter group, and the second reference resistance value is obtained according to the second parameter group; When the insulation resistance value is less than the first reference resistance value and the insulation resistance value is less than the second reference resistance value, it is determined whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value. The battery pack states include a first state and a second state. The first state is when the battery pack is in a power output state that outputs energy to the outside to convert it into vehicle kinetic energy. The second state is when the battery pack is not outputting electrical energy to move the vehicle.

2. The insulation fault detection method according to claim 1, characterized in that, Determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value includes: When the battery pack is in the first state, if the insulation resistance value is detected to be greater than or equal to the first reference resistance value or the insulation resistance value is greater than or equal to the second reference resistance value within a preset time period, it is determined that the battery pack does not have an insulation fault, and the battery pack is marked with an abnormal recovery flag.

3. The insulation fault detection method according to claim 2, characterized in that, Determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value also includes: When the battery pack is in the first state and there is an abnormal recovery indicator in the battery pack during a first time period before the insulation fault detection method is executed, it is determined that there is no insulation fault in the battery pack.

4. The insulation fault detection method according to claim 2, characterized in that, Determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value also includes: When the battery pack is in the first state, and the insulation resistance value is not constant within a preset time period as the power of the first state changes, it is determined that the battery pack does not have an insulation fault; when the battery pack is in the first state, and the insulation resistance value is not constant within a preset time period as the power of the first state changes, it is determined that the battery pack does not have an insulation fault. The When the power change in the first state becomes constant, it is determined that the battery pack has an insulation fault.

5. The insulation fault detection method according to claim 1, characterized in that, Determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value includes: When the battery pack is in the second state, and the insulation resistance value is detected to be greater than or equal to the first reference resistance value or greater than or equal to the second reference resistance value within a preset time period, it is determined that the battery pack does not have an insulation fault, and the battery pack is marked with an abnormal recovery flag; when the battery pack is in the second state, and the insulation resistance value remains less than the first reference resistance value and less than the second reference resistance value within a preset time period, it is determined that the battery pack has an insulation fault.

6. The insulation fault detection method according to claim 5, characterized in that, Determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value also includes: When the battery pack is in the second state and the abnormal recovery flag is present in the battery pack during a first time period before the insulation fault detection method is executed, it is determined that the battery pack does not have an insulation fault.

7. The insulation fault detection method according to claim 5, characterized in that, Determining whether the battery pack has an insulation fault based on the state of the battery pack and the change in the insulation resistance value also includes: When the battery pack is in The In the second state, when connected to an external device, if the insulation resistance value is less than the insulation fault threshold within a preset time period, an alarm signal is issued.

8. The insulation fault detection method according to claim 1, characterized in that, The insulation fault detection method further includes: When the insulation resistance value is less than the first reference resistance value or the insulation resistance value is less than the second reference resistance value, the status data of the battery pack is obtained.

9. A control device comprising at least one processor and at least one storage device, said storage device being adapted to store a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to perform the insulation fault detection method according to any one of claims 1 to 8.

10. A computer-readable storage medium storing a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the insulation fault detection method according to any one of claims 1 to 8.

11. A vehicle, characterized in that, The vehicle includes the control device as described in claim 9.

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