Automobile power battery pack insulation fault teaching simulation device and system

Abstract

The invention relates to the technical field of intelligent teaching, in particular to an automobile power battery pack insulation fault teaching simulation device and system. The battery pack insulation fault detection teaching simulation device comprises a man-machine interaction module, a main control module and an insulation detection module. The main control module comprises a control unit and a data processing unit, and the control unit is used for controlling signals; the insulation detection module comprises a high voltage generation unit, a detected resistor, a signal acquisition unit and an analog-to-digital conversion unit; the high voltage generation unit is used for generating detection voltage corresponding to the control signal; the detection voltage acts on the detected resistor; the signal acquisition unit is used for acquiring the current signal; the analog-to-digital conversion unit is used for converting the current signal into a digital signal; the data processing unit is used for processing the digital signal to generate a detection result. According to the teaching simulation device, modular arrangement is adopted, the structure is simple, operation is convenient, and students can master theoretical knowledge and actual operation ability by operating the device.

Description

Technical Field

[0001] The present invention relates to the field of intelligent teaching technology, and in particular to a battery pack insulation detection teaching simulation device and system. Background Art

[0002] With the surge in global demand for renewable energy and electric vehicles, the use and management of power batteries has become a core issue in the electric vehicle industry and energy storage systems. As an important component of electric vehicles and energy storage equipment, the safety and reliability of power battery packs directly affect the performance and service life of the entire vehicle. Therefore, it is crucial to ensure the insulation performance of power battery packs under high-voltage environments, so power battery pack insulation tests must be carried out. Battery pack insulation tests are one of the important guarantees for electric vehicle safety. Therefore, in order to meet the current market's urgent demand for battery maintenance technicians, schools need to have suitable power battery pack insulation testing equipment for students to simulate learning. The principle of battery pack insulation testing is to use a high-voltage power supply to test the battery pack and detect the insulation of the battery pack's internal circuit. Power battery insulation tests are mostly performed for quality control during the production process, and the equipment used usually has high-precision detection capabilities and complex operating procedures. Existing equipment has obvious limitations in the teaching process.

[0003] CN110174625B provides a power battery pack resistance insulation monitoring system, including: an insulation detection device, a communication interface module, a battery pack high-voltage input line, an insulation detection line, and a power supply module, characterized in that: the insulation detection device includes a control unit, a positive and negative zero composite square wave generation module, an insulation detection signal output module, a positive and negative zero composite square wave signal sampling module, a transmission signal filtering module, a high-voltage line input module, a feedback insulation signal sampling module, a feedback signal filtering module, an alarm indication and power-off protection execution module, and a CAN bus communication module; a control unit, which is used for the operation of the calculation and control logic instructions of the power battery pack resistance insulation monitoring system; a positive and negative zero composite square wave generation module, which is used to generate a composite square wave signal of a specified frequency and send it to the insulation detection signal output module; an insulation detection signal output module, which is used to transmit the generated composite square wave signal to the vehicle body shell, and generate a first marking signal to send to the control unit and the high-voltage line input module; a positive and negative zero composite square wave signal sampling module, which is used to collect the transmitted composite square wave signal, convert the analog signal into a discrete digital signal and transmit it to the transmission signal filtering module; a transmission signal filtering module, which is used to filter the collected composite square wave signal to reduce the interference of the sampling interference, and sends the processed signal to the control unit; the high-voltage line input module is used to collect the total voltage value of the power battery after receiving the first mark signal, and send the sampled value to the control unit after filtering; the control unit immediately generates a time pulse counting instruction after receiving the first mark signal, and generates a second mark signal after counting to the set value; the feedback insulation signal sampling module is used to discretely sample the feedback signal after receiving the second mark signal sent by the control unit, and send the sampled value to the feedback signal filtering module; the feedback signal filtering module is used to filter the received sampled feedback signal, and send the end third mark signal to the control unit after the processing is completed; the alarm indication and power-off protection execution module sends the corresponding alarm indicator light to flash after receiving the judgment of the specific resistance value sent by the control unit, and sends a power-off instruction in serious cases; the power supply module supplies power to the detection module, and the detection module controls the generation of the positive and negative zero composite square wave signal of the insulation detection to be injected into the power battery through the insulation detection line, and the injection signal returns to the detection system through the high-voltage input line of the battery pack, and calculates the insulation signal of the insulation resistance of the positive and negative ends of the power battery by collecting the feedback signal and the power supply voltage signal value, and sends it to the vehicle terminal through the CAN bus communication module.

[0004] CN108490359B discloses a device for detecting the insulation of a power battery pack, which is applied to a power system including at least a power battery pack and a high-voltage component; the device comprises: an alternating current generating circuit, a first capacitor, a second capacitor, a differential circuit and a power management system; the alternating current generating circuit is used to output an alternating current signal; the alternating current signal is an alternating current constant current signal; the alternating current signal is injected into the power system through the first capacitor; the output end of the alternating current generating circuit is connected to the first input end of the differential circuit; the second input end of the differential circuit is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the alternating current generating circuit through the first capacitor. The output end of the generation circuit; the differential circuit is used to subtract the signals collected by the first input end and the second input end and send them to the power management system; the power management system is used to obtain the insulation impedance of the power battery pack according to the signal sent by the differential circuit; the differential circuit includes: a first level conversion circuit, a second level conversion circuit and a subtractor; the first level conversion circuit is used to raise the signal collected by the first input end of the differential circuit by a predetermined voltage value; the second level conversion circuit is used to raise the signal collected by the second input end of the differential circuit by the predetermined voltage value; the subtractor is used to subtract the signal output by the first level conversion circuit from the signal output by the second level conversion circuit.

[0005] In the prior art, battery pack insulation testing devices are mostly used to perform fault detection during production or use. These devices usually have high-precision detection capabilities and complex operating procedures. Such high precision and complexity are not suitable for teaching scenarios. Summary of the invention

[0006] It has been found through long-term practice that in the existing technology, battery pack insulation testing devices are mostly used to perform fault detection during production or use. These devices usually have high-precision detection capabilities and complex operating procedures. Such high precision and complexity are not suitable for teaching scenarios.

[0007] In order to solve the above technical problems, the present invention provides an automobile power battery pack insulation failure teaching simulation device and system.

[0008] In one aspect, the present invention provides an automotive power battery pack insulation fault teaching simulation device. The automotive power battery pack insulation fault teaching simulation device provided by the present invention includes: a human-computer interaction module, a main control module and an insulation detection module; the human-computer interaction module is used to input detection parameters and display detection results; the main control module includes a control unit and a data processing unit, and the control unit is used to generate a control signal; the fault detection module includes a high-voltage generating unit, a measured resistor, a signal acquisition unit and an analog-to-digital conversion unit; the high-voltage generating unit is connected to the control unit to generate a detection voltage corresponding to the control signal; the measured resistor is connected to the high-voltage generating unit to receive the detection voltage and generate a current signal; the signal acquisition unit is connected to the measured resistor to collect the current signal; the analog-to-digital conversion unit is connected to the signal acquisition unit to convert the current signal into a digital signal; the data processing unit is connected to the analog-to-digital conversion unit to process the digital signal and generate a detection result.

[0009] In one possible embodiment, the human-computer interaction module is communicatively connected to the insulation detection module via the main control module.

[0010] In one possible embodiment, the human-computer interaction module includes a prompt unit, and the prompt unit is used to prompt the operation steps.

[0011] In one possible embodiment, the human-computer interaction module further includes an input unit, and the input unit is used to input detection parameters; the input unit is connected to the control unit, and the control unit generates the control signal according to the detection parameters.

[0012] In one possible embodiment, the human-computer interaction module further includes an output unit, the output unit is connected to the data processing unit, and the output unit is used to display the detection result.

[0013] In one embodiment, the high voltage generating unit includes a high voltage controller and a high voltage generator; the high voltage controller is used to control the high voltage generator to generate a detection voltage according to the control signal;

[0014] In one possible embodiment, the detection voltage includes an action voltage and a feedback voltage, and the action voltage and the feedback voltage are of the same magnitude; the action voltage is applied to the measured resistor, and the feedback voltage is transmitted to the main control unit, and the main control unit can convert the feedback voltage into a feedback signal and transmit the feedback signal to the high-voltage controller.

[0015] In one possible embodiment, the high voltage controller is provided with a comparator; the comparator is used to compare the feedback signal and the control signal; if the feedback signal deviates from the control signal, the high voltage controller controls the high voltage generator to adjust the magnitude of the detection voltage.

[0016] In one possible embodiment, the insulation detection module also includes an alarm unit, an input end of the alarm unit is connected to the information acquisition unit, and an output end of the alarm unit is connected to the control unit. If the current information collected by the information acquisition unit exceeds a threshold, the alarm unit outputs an alarm signal.

[0017] In another aspect, the present invention provides an automobile power battery pack insulation failure teaching simulation system, the automobile power battery pack insulation failure teaching simulation system comprising an external power supply and an automobile power battery pack insulation failure teaching simulation device, the external power supply being electrically connected to the automobile power battery pack insulation failure teaching simulation device.

[0018] The vehicle power battery pack insulation fault teaching simulation device disclosed in the scheme of the present invention is provided with a human-computer interaction module, a main control module and a fault detection module; the human-computer interaction module is used to input detection parameters and display detection results, and the human-computer interaction module can intuitively display the operation process and detection results, so as to facilitate the trainees to understand the process and principle of battery pack insulation detection; the main control module includes a control unit and a data processing unit, the control unit is used to generate a control signal, and the control unit can generate a corresponding control signal according to the detection parameters input by the trainees; the fault detection module includes a high-voltage generating unit, a measured resistor, a signal acquisition unit and an analog-to-digital conversion unit; the high-voltage generating unit is connected to the control unit to generate a signal corresponding to the control signal The detection voltage is transmitted to the control signal of the high-voltage generating unit. The high-voltage generating unit can generate the corresponding detection voltage according to the control signal. The high-voltage generating unit generates the corresponding high-voltage pulse signal according to the digital signal; the measured resistor is connected to the high-voltage generating unit, and the high-voltage pulse signal acts on the measured resistor to generate a micro-current signal. The resistor is used to replace the power battery pack, which simplifies the operation steps and increases the safety of the teaching simulation process; the signal acquisition unit is connected to the measured resistor to collect the current signal; the analog-to-digital conversion unit is connected to the signal acquisition unit to convert the current signal into a digital signal; the data processing unit is connected to the analog-to-digital conversion unit to process the digital signal and generate a detection result. The scheme of the present invention adopts a modular design, combines the human-computer interaction module with the insulation detection module, simplifies the operation steps, and ensures the safety of the detection process. The teaching simulation device adopts a modular setting, has a simple structure, and is easy to operate. Trainees can master theoretical knowledge and practical operation skills by operating the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A framework diagram of a vehicle power battery pack insulation fault teaching simulation device according to an embodiment of the present invention;

[0020] Figure 2 A flowchart of a battery pack insulation fault detection teaching simulation according to an embodiment of the present invention;

[0021] Figure 3 A flowchart of insulation detection of an insulation module according to an embodiment of the present invention;

[0022] Figure 4 A framework diagram of a human-computer interaction module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention are described in detail below.

[0024] It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] In the present invention, unless otherwise stated, the directional words such as "upper" and "lower" usually refer to the orientation in the assembled state. "Inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] It has been found through long-term practice that in the existing technology, battery pack insulation testing devices are mostly used to perform fault detection during production or use. These devices usually have high-precision detection capabilities and complex operating procedures. Such high precision and complexity are not suitable for teaching scenarios.

[0028] In order to solve the above technical problems, the present invention provides an automobile power battery pack insulation failure teaching simulation device and system.

[0029] Figure 1 A framework diagram of a vehicle power battery pack insulation fault teaching simulation device according to an embodiment of the present invention; Figure 2A flowchart of a teaching simulation of insulation fault detection of a vehicle power battery pack according to an embodiment of the present invention; Figure 3 A flowchart of insulation detection of an insulation module according to an embodiment of the present invention; Figure 4 A framework diagram of a human-computer interaction module according to an embodiment of the present invention.

[0030] like Figure 1-Figure 3 As shown, in order to simplify the structure of the battery pack insulation detection teaching simulation device and facilitate the operation of trainees, in a specific embodiment, the automotive power battery pack insulation fault teaching simulation device provided by the present invention includes: a human-computer interaction module 1, a main control module 2 and an insulation detection module 3; wherein the main control module 2 includes a control unit 21 and a data processing unit 22, the control unit 21 is used to generate a control signal, and the insulation detection module 3 includes a high-voltage generating unit 31, a measured resistor 32, a signal acquisition unit 33 and an analog-to-digital conversion unit 34, specifically, the high-voltage generating unit 31 is connected to the control unit 21, and is used to generate a detection voltage corresponding to the control signal; the measured resistor 32 is connected to the high-voltage generating unit 31, and is used to receive the detection voltage and generate a current signal; the signal acquisition unit 33 is connected to the measured resistor 32, and is used to collect the current signal; the analog-to-digital conversion unit 34 is connected to the signal acquisition unit 33, and is used to convert the current signal into a digital signal; the data processing unit 22 is connected to the analog-to-digital conversion unit 34, and is used to process the digital signal and generate a detection result. Furthermore, the human-computer interaction module 1 can be provided with a visual screen and an operation keyboard. The trainees set the required detection parameters in the human-computer interaction module 1 by operating the keyboard. The main control module 2 can be set as a main control chip. After the main control chip obtains the detection parameters, it converts the discrete digital signal into an analog signal. The analog signal is a control signal generated by the control unit 21. The control signal is sent to the high-voltage generating unit through the DAC pin. After the high-voltage generating unit receives the control signal, it generates a detection voltage according to the control signal. The measured resistor 32 is connected to the high-voltage generating unit. The detection voltage acts on the measured resistor 32 to generate a current signal. The signal acquisition unit 33 can accurately collect the tiny current signal generated after the detection voltage passes through the insulation resistance. The analog-to-digital conversion unit 34 is connected to the signal acquisition unit 33. The analog-to-digital conversion unit 34 can be provided with an analog-to-digital converter, which can convert the collected current signal into a digital signal. The analog-to-digital conversion unit 34 is also connected to the data processing unit 22 of the main control module 2. After the data processing unit 22 receives the digital signal, it processes the digital signal to generate a detection result.

[0031] In an example, the main control module 2 can be a main control chip, the signal acquisition unit 33 can be a microcurrent acquisition chip, and the analog-to-digital conversion unit 34 can be an analog-to-digital converter (AD770SBR), wherein the DAC pin of the main control chip is responsible for sending a control signal for adjusting and controlling the output of the detection voltage, thereby performing a high-voltage operation. After the microcurrent acquisition chip acquires the current signal, it transmits it to the analog-to-digital converter to convert the analog signal into a digital signal. The analog-to-digital converter exchanges data with the main control chip through the DIN and DOUT pins. At the same time, the SCLK, DIN, DOUT and DRDY pins of the main control chip are also connected to the corresponding pins of the analog-to-digital converters for data exchange. Among them, SCLK is a clock pin, which is used to ensure the stability and reliability of signal transmission, and at the same time provides high-precision real-time feedback for the main control chip, ensuring the efficient operation of the entire control system.

[0032] In order to maintain the stability of signal transmission, in a specific embodiment, the human-computer interaction module 1 is communicatively connected with the fault detection module through the main control module 2 .

[0033] like Figure 4 As shown, in order to allow trainees to operate independently, in a specific embodiment, the human-computer interaction module 1 includes a prompt unit, which is used to prompt the operation steps. For example, the prompt unit can prompt: "Please enter the detection parameters", at this time the trainee enters the detection parameters in the specified position, and the prompt unit prompts: "Insulation fault occurs, please modify the detection parameters", and the test trainee modifies the detection parameters according to the prompt.

[0034] like Figure 4 As shown, in order to facilitate trainees to input detection parameters, in a specific embodiment, the human-computer interaction module 1 also includes an input unit 11, which is used to input detection parameters; the input unit 11 is connected to the control unit 21, and the control unit 21 generates a control signal according to the detection parameters.

[0035] like Figure 4 As shown, in order to allow students to understand the detection principle more intuitively, in a specific embodiment, the human-computer interaction module 1 also includes an output unit 12. Specifically, the output unit 12 is connected to the data processing unit 22, and the output unit 12 is used to display the detection results. Furthermore, the data processing unit 22 can also receive the detection results, and the change process of the detection results can be displayed by the detection unit. Students can understand the detection principle through the change process of the data; for example, the analog-to-digital converter transmits the digital signal to the data processing unit 22 in real time, and the digital processing unit processes the digital signal, and the output unit 12 outputs it. The output content can be: "The detection pressure is 500V, the current generated is 100μA, and an insulation fault occurs."

[0036] The detection voltage generated by the high-voltage generating unit 31 will be affected by load changes and environmental factors, resulting in instability of the detection voltage. In order to maintain the accuracy and stability of the detection voltage, in a specific embodiment, the high-voltage generating unit 31 includes a high-voltage controller subunit and a high-voltage generator subunit; the high-voltage controller subunit is used to control the high-voltage generator subunit to generate the detection voltage according to the control signal. Specifically, the detection voltage includes an action voltage and a feedback voltage, and the action voltage and the feedback voltage are the same in magnitude; wherein the action voltage is applied to the measured resistor 32, and the feedback voltage is transmitted to the main control unit, and the main control unit can convert the feedback voltage into a feedback signal and transmit the feedback signal to the high-voltage controller subunit. The high-voltage controller subunit is provided with a comparator, and the comparator is used to compare the feedback signal and the control signal. If there is a deviation between the feedback signal and the control signal, the high-voltage controller subunit controls the high-voltage generator subunit to adjust the magnitude of the detection voltage. Further, the feedback voltage is transmitted to the control unit 21, and the control unit 21 generates a feedback signal after dividing and filtering the feedback voltage, and transmits the feedback signal to the high-voltage controller subunit. The high-voltage controller subunit can be provided with a PWM controller,

[0037] The PWM controller can control the size of the detection voltage by adjusting the duty cycle. Specifically, the high-voltage controller subunit is provided with a comparator, which can compare the consistency of the detection voltage and the control signal. If the feedback signal and the control signal are inconsistent, an error signal will be generated. When the PWM controller receives the error signal, the PWM controller adjusts the PWM duty cycle, wherein the PWM duty cycle is used to adjust the size of the load and output power. If the comparator compares that the feedback signal is lower than the control signal, the PWM controller increases the PWM duty cycle, and the detection voltage increases at this time. Conversely, if the comparator compares that the feedback signal is higher than the control signal, the PWM controller lowers the PWM duty cycle, and the detection voltage decreases at this time. This cycle is repeated to generate closed-loop control. Furthermore, the high-voltage generator subunit can be provided with a high-voltage transformer, and the coil of the high-voltage transformer generates a high-voltage output under the action of current.

[0038] In order to ensure the safety during the teaching process and improve the service life of the teaching simulation device, in a specific embodiment, the insulation detection module 3 also includes an alarm unit, the input end of the alarm unit is connected to the signal acquisition unit 33, and the output end of the alarm unit is connected to the control unit 21. If the current information collected by the signal acquisition unit 33 exceeds the threshold, the alarm unit outputs an alarm signal. Further, the control unit 21 receives the alarm signal and controls the high-voltage generating unit to suspend the output voltage. At this time, the output unit 12 outputs: "The current exceeds the threshold, and insulation detection is stopped."

[0039] In another aspect, the present invention provides a vehicle power battery pack insulation failure teaching simulation system, the vehicle power battery pack insulation failure teaching simulation system includes an external power supply and the vehicle power battery pack insulation failure teaching simulation device, and the external power supply is electrically connected to the vehicle power battery pack insulation failure teaching simulation device. Specifically, the external power supply is connected to the vehicle power battery pack insulation failure teaching simulation device through a connecting wire, wherein the connecting wires are set to three, namely, the L end, the E end and the G end. After the wiring is completed, the entire vehicle power battery pack insulation failure teaching simulation device is powered on, and the trainee starts to input the detection parameters for detection.

[0040] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0041] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0042] In the several embodiments provided by the present invention, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0043] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0044] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle power battery pack insulation failure teaching simulation device, characterized in that: The vehicle power battery pack insulation fault teaching simulation device and system comprises: a human-computer interaction module, a main control module and an insulation detection module; The human-computer interaction module is used to input detection parameters and display detection results; The main control module includes a control unit and a data processing unit, and the control unit is used to generate a control signal according to the detection parameters; The insulation detection module includes a high voltage generating unit, a resistance to be measured, a signal acquisition unit and an analog-to-digital conversion unit; The high voltage generating unit is connected to the control unit and is used to generate a detection voltage corresponding to the control signal; The measured resistor is connected to the high voltage generating unit and is used to receive the detection voltage and generate a current signal; The signal acquisition unit is connected to the measured resistor and is used to acquire the current signal; The analog-to-digital conversion unit is connected to the signal acquisition unit and is used to convert the current signal into a digital signal; The data processing unit is connected to the analog-to-digital conversion unit and is used to process the digital signal and generate a detection result.

2. The vehicle power battery pack insulation failure teaching simulation device according to claim 1 is characterized in that: The human-computer interaction module is communicatively connected with the insulation detection module through the main control module.

3. The vehicle power battery pack insulation failure teaching simulation device according to claim 2 is characterized in that: The human-computer interaction module includes a prompting unit, and the prompting unit is used to prompt operation steps.

4. The vehicle power battery pack insulation failure teaching simulation device according to claim 2 is characterized in that: The human-computer interaction module further includes an input unit, which is used to input detection parameters; the input unit is connected to the control unit, and the control unit generates the control signal according to the detection parameters.

5. The vehicle power battery pack insulation failure teaching simulation device according to claim 2, characterized in that: The human-computer interaction module also includes an output unit, which is connected to the data processing unit and is used to display the detection process and the detection result.

6. The vehicle power battery pack insulation failure teaching simulation device according to claim 1, characterized in that: The high voltage generating unit comprises a high voltage controller subunit and a high voltage generator subunit; The high voltage controller subunit is used to control the high voltage generator subunit to generate a detection voltage according to the control signal.

7. The vehicle power battery pack insulation failure teaching simulation device according to claim 6, characterized in that: The detection voltage includes an action voltage and a feedback voltage, and the action voltage and the feedback voltage are of the same magnitude; The applied voltage is applied to the measured resistor, and the feedback voltage is transmitted to the control unit. The control unit can convert the feedback voltage into a feedback signal and transmit the feedback signal to the high-voltage controller subunit.

8. The vehicle power battery pack insulation failure teaching simulation device according to claim 7 is characterized in that: The high voltage controller subunit is provided with a comparator; The comparator is used to compare the feedback signal and the control signal; If the feedback signal deviates from the control signal, the high voltage controller controls the high voltage generator to adjust the magnitude of the detection voltage.

9. The vehicle power battery pack insulation failure teaching simulation device according to claim 1, characterized in that: The insulation detection module also includes an alarm unit, an input end of the alarm unit is connected to the signal acquisition unit, and an output end of the alarm unit is connected to the control unit. If the current information collected by the signal acquisition unit exceeds a threshold, the alarm unit outputs an alarm signal.

10. An automotive power battery pack insulation fault teaching simulation system, characterized in that: The battery pack insulation detection teaching simulation system comprises an external power supply and an automotive power battery pack insulation fault detection teaching simulation device according to any one of claims 1 to 9, wherein the external power supply is electrically connected to the battery pack insulation fault detection teaching simulation device.

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