A new energy vehicle motor air tightness detection method

Abstract

The application provides a new energy automobile motor air tightness detection method, first, a low pressure signal interface and a first waterproof air valve interface of a motor body are blocked to form a closed inner cavity of the motor body, and a PN interface and a second waterproof air valve interface of an electric control device are blocked to form a closed inner cavity of the electric control device; then, the inner cavities of the motor body and the electric control device are inflated by an air tightness detector, while cutting off the air source and stabilizing the air pressure, a differential pressure value of motor leakage is calculated to determine whether the motor leaks. The new energy automobile motor air tightness detection method can detect the air tightness of the motor at each stage, and can also ensure that the motor will not absorb moisture and rust inside, thereby prolonging the service life of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor airtightness testing technology, specifically to a method for testing the airtightness of a new energy vehicle motor. Background Technology

[0002] The motor is a crucial component of new energy vehicles. During its production, assembly, and use, the motor's airtightness is extremely important, as it directly affects the reliability and safety of the entire vehicle.

[0003] Currently, there are two main methods for testing the airtightness of motors. One method involves immersing the motor in water, where it is placed in a water tank with the motor fully assembled (high and low voltage wiring harnesses pre-assembled), the bottom of the motor being 1 meter above the water surface. The test lasts for 0.5 hours, and water must not enter the motor casing. The disadvantage of this method is that if water gets into the motor or it rusts, there is a risk of failure or rendering the motor unusable.

[0004] Secondly, some manufacturers do not install waterproof and breathable valves on the motors after they come off the production line. Instead, during assembly, they use tooling to connect the motors and simultaneously inflate both the motor and the vent to conduct an airtightness test. Only after the test is passed are the waterproof and breathable valves installed. The disadvantages are that the motors need to be placed in a temperature-controlled workshop (around 26°C) for at least 6 hours before testing to avoid mistesting due to temperature deviations. Also, because the motors are not equipped with waterproof and breathable valves before testing, the casing is open during transportation and storage. If the storage workshop is humid, the motor windings will absorb moisture, leading to insulation faults in the entire machine. Furthermore, the probability of internal rusting increases, affecting the overall lifespan of the motor.

[0005] The two airtightness testing processes mentioned above test the airtightness of the motor during the manufacturing process. However, the airtightness of the motor can be compromised during transportation and storage, assembly, and vehicle testing. Currently, there is no process that can test the airtightness of the motor at all stages of its development. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a method for testing the air tightness of a new energy vehicle motor, which can test the air tightness of the motor at various stages, and also ensure that the motor does not absorb moisture and rust inside, thereby improving the service life of the motor.

[0007] To achieve the above objectives, the present invention provides a method for testing the air tightness of a new energy vehicle motor. The motor includes a motor body and an electronic control device. The motor body has a low-voltage signal interface and a first waterproof and breathable valve interface. A first waterproof and breathable valve is internally threaded into the first waterproof and breathable valve interface. The electronic control device has a PN interface and a second waterproof and breathable valve interface. A second waterproof and breathable valve is internally snapped into the second waterproof and breathable valve interface.

[0008] The method for testing the air tightness of electric motors in new energy vehicles includes the following steps:

[0009] To block the low-pressure signal interface, the first waterproof and ventilated valve in the first waterproof and ventilated valve interface is unscrewed, and the first waterproof and ventilated valve interface is blocked using a first waterproof and ventilated valve interface blocking tool.

[0010] The PN interface is blocked to keep the second waterproof and breathable valve inside the second waterproof and breathable valve interface, and the second waterproof and breathable valve interface is blocked using a second waterproof and breathable valve blocking tool.

[0011] The air outlet pipeline of the air tightness tester is split into a first air outlet branch pipeline and a second air outlet branch pipeline. The first air outlet branch pipeline is connected to the inner cavity of the motor body via the first waterproof and breathable valve interface sealing fixture, and the second air outlet branch pipeline is connected to the inner cavity of the electronic control device via the second waterproof and breathable valve interface sealing fixture.

[0012] Turn on the air tightness tester and inflate the motor body and the electronic control device for t1. Cut off the air source and stabilize the pressure for t2. Calculate the pressure difference between the motor body and the electronic control device and compare it with the standard value to determine whether the air tightness of the motor is qualified.

[0013] Preferably, the airtightness testing method for new energy vehicle motors is used to perform airtightness testing on a single motor.

[0014] The low-voltage signal interface is sealed using a dedicated low-voltage signal interface sealing fixture, and the PN interface is sealed using a dedicated PN interface sealing fixture.

[0015] Preferably, the new energy vehicle motor air tightness testing method is used to perform air tightness testing on the motors of the whole vehicle;

[0016] A wire harness is installed inside the low-voltage signal interface to block the low-voltage signal interface, and a wire harness is installed inside the PN interface to block the PN interface.

[0017] Preferably, the inflation pressure for inflating the motor body and the electronic control device is 18000Pa.

[0018] Preferably, the inflation time t1 for inflating the motor body and the electronic control device is 200 seconds.

[0019] Preferably, the voltage stabilization time t2 for stabilizing the voltage of the motor body and the electronic control device is 45 seconds.

[0020] Preferably, the inflation pressure for inflating the motor body and the electronic control device is 9000 Pa.

[0021] Preferably, the inflation time t1 for inflating the motor body and the electronic control device is 60 seconds.

[0022] Preferably, the voltage stabilization time t2 for stabilizing the voltage of the motor body and the electronic control device is 10 seconds.

[0023] Preferably, the second waterproof and breathable valve interface sealing fixture includes:

[0024] A sealing cap is press-fitted onto the outside of the second waterproof and breathable valve interface, and a sealing gasket is provided between the sealing cap and the electronic control device;

[0025] A pressure screw is disposed on the surface of the sealing cover opposite to the electronic control device to apply pressure to the sealing cover;

[0026] A bracket is fixed to the motor body and / or the electronic control device, and the end of the screw away from the sealing cover is threadedly connected to the bracket.

[0027] The invention has the following beneficial effects:

[0028] Compared to the background technology description, this method for testing the airtightness of a new energy vehicle motor involves unscrewing the first waterproof vent valve from its interface during the airtightness test. The interface is then sealed using a sealing fixture. Since the second waterproof vent valve is connected to its interface via a snap-fit, it remains inside the interface. The sealing fixture is then placed over the interface. This ensures that waterproof vent valves are installed on both the motor body and the electronic control unit before the airtightness test, preventing moisture absorption and rust inside these components and extending the motor's lifespan.

[0029] Furthermore, this method for testing the airtightness of new energy vehicle motors can test the airtightness of the motor at various stages. In the standalone motor stage, such as during production and storage, a dedicated low-voltage signal interface sealing fixture and a first waterproof and breathable valve interface sealing fixture are used to seal the low-voltage signal interface and the first waterproof and breathable valve interface of the motor body. Similarly, a dedicated PN interface sealing fixture and a second waterproof and breathable valve interface sealing fixture are used to seal the PN interface and the second waterproof and breathable valve interface of the electronic control device, thereby achieving airtightness testing of the standalone motor. In the vehicle motor configuration (i.e., the motor is mounted on the vehicle), the low-voltage signal interface of the motor body is equipped with a corresponding wiring harness. The assembled wiring harness effectively seals the low-voltage signal interface. Simultaneously, the first waterproof and ventilated valve interface is sealed using a first waterproof and ventilated valve interface sealing fixture, thus sealing the motor body. Similarly, the PN interface of the electronic control device is also equipped with a corresponding wiring harness. The assembled wiring harness effectively seals the PN interface. Simultaneously, the second waterproof and ventilated valve interface is sealed using a second waterproof and ventilated valve interface sealing fixture, thus sealing the electronic control device. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and provide explanations, but do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic diagram illustrating the principle of airtightness testing for the new energy vehicle motor described in this invention.

[0032] Figure 2 This is a schematic diagram of the structure of the second waterproof and breathable valve interface sealing fixture described in this invention;

[0033] Attached icon number

[0034] 1-Motor body; 2-Electrical control device; 3-Low-voltage signal interface; 4-First waterproof and breathable valve interface; 5-PN interface; 6-Second waterproof and breathable valve interface; 7-First waterproof and breathable valve interface sealing fixture; 8-Second waterproof and breathable valve interface sealing fixture; 8a-Sealing cap; 8b-Pressure screw; 8c-Bracket; 8d-Bolt head; 8e-Screw; 9-Air tightness tester; 10-First air outlet branch pipe; 11-Second air outlet branch pipe; Detailed Implementation

[0035] The core of this invention is to provide a method for testing the air tightness of a new energy vehicle motor, which can test the air tightness of the motor at various stages and ensure that the motor does not absorb moisture and rust inside, thereby improving the service life of the motor.

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figure 1 , Figure 2 , Figure 1 This is a schematic diagram illustrating the principle of airtightness testing for the new energy vehicle motor described in this invention. Figure 2 This is a schematic diagram of the structure of the second waterproof and breathable valve interface sealing fixture described in this invention.

[0038] The new energy vehicle motor includes a motor body 1 and an electronic control device 2. The electronic control device 2 is fixed on the motor body 1. The motor body 1 has a low-voltage signal interface 3 and a first waterproof and breathable valve interface 4. The first waterproof and breathable valve interface 4 is internally threaded with a first waterproof and breathable valve. The electronic control device 2 has a PN interface 5 and a second waterproof and breathable valve interface 6. The second waterproof and breathable valve interface 6 is internally snapped with a second waterproof and breathable valve.

[0039] This invention discloses a method for testing the airtightness of a new energy vehicle motor, specifically including the following steps:

[0040] Block the low-voltage signal interface 3, unscrew the first waterproof and ventilated valve in the first waterproof and ventilated valve interface 4, and use the first waterproof and ventilated valve interface blocking tool 7 to block the first waterproof and ventilated valve interface 4 to achieve sealing of the motor body 1.

[0041] The PN interface 5 is sealed to keep the second waterproof and breathable valve inside the second waterproof and breathable valve interface 6, and the second waterproof and breathable valve sealing fixture 8 is used to seal the second waterproof and breathable valve interface 6 to achieve the sealing of the electronic control device 2.

[0042] The air outlet pipe of the air tightness tester 9 is split into a first air outlet branch pipe 10 and a second air outlet branch pipe 11. The first air outlet branch pipe 10 is connected to the inner cavity of the motor body 1 via the first waterproof and breathable valve interface sealing fixture 7, and the second air outlet branch pipe 11 is connected to the inner cavity of the electrical control device 2 via the second waterproof and breathable valve interface sealing fixture 8.

[0043] Turn on the air tightness tester 9 and inflate the motor body 1 and the electronic control device 2 for t1. Cut off the air source and stabilize the pressure for t2. Calculate the pressure difference between the motor body 1 and the electronic control device 2 and compare it with the standard value to determine whether the motor air tightness is qualified.

[0044] In practical application, this method for testing the air tightness of a new energy vehicle motor first creates a sealed cavity by sealing the low-pressure signal interface 3 and the first waterproof and breathable valve interface 4 of the motor body 1. Similarly, it creates a sealed cavity by sealing the PN interface 5 and the second waterproof and breathable valve interface 6 of the electronic control device 2. Then, an air tightness tester 9 is used to inflate the cavities of the motor body 1 and the electronic control device 2. While cutting off the air source and stabilizing the air pressure, the differential pressure value indicating motor leakage is calculated to determine whether the motor is leaking.

[0045] Compared to the background technology description, this method for testing the airtightness of a new energy vehicle motor involves unscrewing the first waterproof vent valve from the first waterproof vent valve interface 4 during the airtightness test, and then sealing the first waterproof vent valve interface 4 with a first waterproof vent valve interface sealing fixture 7. Since the second waterproof vent valve is connected to the second waterproof vent valve interface 6 via a snap-fit ​​connection, the second waterproof vent valve is kept inside the second waterproof vent valve interface 6, and the second waterproof vent valve interface sealing fixture 8 is placed over the outside of the second waterproof vent valve interface 6. In this way, before the airtightness test, waterproof vent valves are installed on both the motor body 1 and the electronic control device 2, thereby preventing the motor body 1 and the electronic control device 2 from absorbing moisture and rusting during storage, thus improving the service life of the motor.

[0046] Furthermore, this method for testing the airtightness of new energy vehicle motors can test the airtightness of the motor at various stages. In the stand-alone motor state, such as during the production and storage stages, a dedicated low-voltage signal interface sealing fixture and a first waterproof and breathable valve interface sealing fixture are used to seal the low-voltage signal interface 3 and the first waterproof and breathable valve interface 4 of the motor body 1. A dedicated PN interface sealing fixture and a second waterproof and breathable valve interface sealing fixture are used to seal the PN interface 5 and the second waterproof and breathable valve interface 6 of the electronic control device, thereby realizing the airtightness test of the stand-alone motor. In the vehicle motor state (i.e., the motor is assembled on the vehicle), the low-voltage signal interface 3 of the motor body 1 is equipped with a corresponding wiring harness, which seals the low-voltage signal interface 3. At the same time, the first waterproof and ventilated valve interface 4 is sealed by the first waterproof and ventilated valve interface sealing fixture 7, thus sealing the motor body. The PN interface 5 of the electronic control device 2 is also equipped with a corresponding wiring harness, which seals the PN interface 5. At the same time, the second waterproof and ventilated valve interface 6 is sealed by the second waterproof and ventilated valve interface sealing fixture 8, thus sealing the electronic control device 2.

[0047] The following is a detailed explanation of the airtightness testing method for new energy vehicle motors, applied to the airtightness testing of single motors.

[0048] This method for testing the air tightness of electric motors in new energy vehicles is used to test the air tightness of a single motor, and specifically includes the following steps:

[0049] S1. Use a low-voltage signal interface sealing tool to seal the low-voltage signal interface 3, unscrew the first waterproof and ventilated valve in the first waterproof and ventilated valve interface, and use the first waterproof and ventilated valve interface sealing tool 7 to seal the first waterproof and ventilated valve interface 4 to achieve sealing of the motor body 1.

[0050] S2. Use a PN interface sealing tool to seal the PN interface 5, so that the second waterproof and breathable valve is kept in the second waterproof and breathable valve interface 6, and use a second waterproof and breathable valve sealing tool 8 to seal the second waterproof and breathable valve interface 6, thereby achieving the sealing of the electrical control device 2.

[0051] S3. The air outlet pipe of the air tightness tester 9 is split into a first air outlet branch pipe 10 and a second air outlet branch pipe 11. The first air outlet branch pipe 10 is connected to the inner cavity of the motor body 1 via the first waterproof and breathable valve interface sealing fixture 7, and the second air outlet branch pipe 11 is connected to the inner cavity of the electrical control device 2 via the second waterproof and breathable valve interface sealing fixture 8.

[0052] S4. Turn on the air tightness tester 9 and inflate the motor body 1 and the electronic control device 2 with an inflation pressure of 18000Pa and an inflation time of 200S. Then, cut off the air source and stabilize the pressure for 45S. Calculate the pressure difference between the motor body 1 and the electronic control device 2 and compare it with the standard value to determine whether the motor air tightness is qualified.

[0053] Serial Number project Standard value unit 1 Ready (Countdown) 15 S 2 inflation pressure value 18000 Pa 3 Minimum inflation pressure 16000 Pa 4 Maximum inflation pressure 20000 Pa 5 inflation time 200 S 6 Minimum stabilizing pressure 16000 Pa 7 Maximum stabilizing pressure 20000 Pa 8 Stabilization time 45 S 9 Minimum leakage pressure -57 Pa 10 Maximum leakage pressure 57 Pa 11 Test time 20 S

[0054] Table 1. Air tightness test standards for single-unit motors

[0055] It should be noted that the airtightness test standard for single motors in Table 1 is obtained by increasing the sample size of airtightness testing vehicles (≥100 vehicles), recording and feeding back the test results, and continuously making reasonable adjustments to the test data, ultimately achieving the standard data for the airtightness and waterproofness of single motors to reach the IP67 protection level.

[0056] Additionally, it should be noted that the airtightness testing of individual motors involves using specialized sealing fixtures to seal all interfaces of the motor body 1 and the electrical control device 2. Therefore, the airtightness testing standards for individual motors are quite stringent. Through extensive testing, the testing standards for individual motors shown in Table 1 above were derived. Based on the standards in Table 1, it can be determined whether the airtightness of the individual motor is up to standard.

[0057] The following is a detailed explanation of the airtightness testing method for new energy vehicle motors, applicable to the airtightness testing of the entire vehicle motor.

[0058] S1. When the motor is assembled on the vehicle, the corresponding wiring harness is installed in the low-voltage signal interface 3. The assembled wiring harness blocks the low-voltage signal interface 3. The first waterproof and ventilated valve in the first waterproof and ventilated valve interface 4 is unscrewed, and the first waterproof and ventilated valve interface 4 is blocked by the first waterproof and ventilated valve interface blocking tool 7 to achieve the sealing of the motor body 1.

[0059] If a corresponding wire harness is also installed in the S2 and PN interfaces 5, the installed wire harness will block the PN interface 5, so that the second waterproof and breathable valve is kept in the second waterproof and breathable valve interface 6, and the second waterproof and breathable valve sealing fixture 8 will be used to seal the second waterproof and breathable valve interface 6 to achieve the sealing of the electronic control device 2.

[0060] S3. The air outlet pipe of the air tightness tester 9 is split into a first air outlet branch pipe 10 and a second air outlet branch pipe 11. The first air outlet branch pipe 10 is connected to the inner cavity of the motor body 1 via the first waterproof and breathable valve interface sealing fixture 7, and the second air outlet branch pipe 11 is connected to the inner cavity of the electrical control device 2 via the second waterproof and breathable valve interface sealing fixture 8.

[0061] S4. Turn on the air tightness tester 9 and inflate the motor body 1 and the electronic control device 2 with an inflation pressure of 10000Pa and an inflation time of 60S. Then, cut off the air source and stabilize the pressure for 10S. Calculate the pressure difference between the motor body 1 and the electronic control device 2 and compare it with the standard value to determine whether the motor air tightness is qualified.

[0062]

[0063]

[0064] Table 2 Airtightness Test Standards for Vehicle Motors

[0065] It should be noted that the airtightness test standard for the whole vehicle motor in Table 2 is obtained by increasing the sample size of vehicles tested for airtightness (≥100 vehicles), recording and feeding back the test results, and continuously making reasonable adjustments to the test data, so as to finally achieve the standard data for the airtightness and waterproofness of the whole vehicle motor to reach the IP67 protection level.

[0066] Additionally, it should be noted that during the airtightness test of the entire vehicle motor, the low-voltage signal interface 3 of the motor body 1 and the PN interface 5 of the electronic control device 2 are sealed by the corresponding assembly wiring harness. Because there is a gap between the outer insulation and the internal copper core wire of the assembly wiring harness, during the ventilation test, gas will flow to other devices through this gap. The vent valves on these other devices can then release the gas. Therefore, the airtightness test standard for the entire vehicle motor is relatively lenient compared to the airtightness test standard for a single motor. Through extensive testing, the test standards for the entire vehicle motor in Table 2 above were derived. Based on the standards in Table 2, it can be determined whether the airtightness of the entire vehicle motor is qualified.

[0067] In summary, this method for testing the air tightness of electric motors in new energy vehicles can test the air tightness of motors at various stages. The testing process is simple and has the advantages of being easy to operate, portable, and low-cost, filling the current technological gap that cannot test the air tightness of motors at all stages.

[0068] The following is a detailed description of the specific structure of the second waterproof and breathable valve interface sealing fixture 8.

[0069] like Figure 2 As shown, the second waterproof and breathable valve interface sealing fixture 8 includes: a sealing cover 8a, a pressing screw 8b, and a bracket 8c. The sealing cover 8a is press-fitted onto the outside of the second waterproof and breathable valve interface 6. The pressing screw 8b is disposed on the surface of the sealing cover 8a away from the electronic control device 2 to apply pressure to the sealing cover 8a. The bracket 8c is fixed to the motor body 1 and / or the electronic control device 2. The end of the pressing screw 8b away from the sealing cover 8a is threadedly connected to the bracket 8c.

[0070] Since the second waterproof and breathable valve interface 6 on the electronic control device 2 retains a snap-fit ​​second waterproof and breathable valve, a sealing cover 8a is designed to cover the entire interface. Therefore, when performing airtightness testing on the motor, it is not necessary to remove the second waterproof and breathable valve from the interface 6 to achieve a seal. It should be noted that the reason for retaining the second waterproof and breathable valve within the interface 6 when sealing it is that the second waterproof and breathable valve is inconvenient to disassemble and install.

[0071] In practical applications, the second exhaust branch pipe 11 can extend from the side wall of the sealing cover 8a into the interior of the sealing cover 8a, thereby connecting the second exhaust branch pipe 11 with the inner cavity of the electronic control device 2. In practical applications, pressure can be applied to the sealing cover 8a by tightening the pressure screw 8b, ensuring that the sealing cover 8a is securely pressed onto the electronic control device 2. To increase the sealing capacity of the sealing cover 8a, a sealing gasket can also be placed between the sealing cover 8a and the electronic control device 2.

[0072] Preferably, a bolt head 8d is fixedly provided on the pressing screw 8b to facilitate tightening of the pressing screw 8b. In addition, to facilitate the installation of the bracket 8c, the bracket 8c can be fixed to the motor body 1 and / or the electronic control device 2 by screws 8e.

[0073] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0074] It should be understood that the use of terms such as "system," "device," "unit," and / or "module" in this application is merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0075] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0076] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0077] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0078] If a flowchart is used in this application, it is used to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0079] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for testing the air tightness of a new energy vehicle motor, wherein the motor includes a motor body and an electronic control device, the motor body has a low-voltage signal interface and a first waterproof and breathable valve interface, the first waterproof and breathable valve interface is internally threaded with a first waterproof and breathable valve, the electronic control device has a PN interface and a second waterproof and breathable valve interface, the second waterproof and breathable valve interface is internally snapped with a second waterproof and breathable valve. Its features are, The method for testing the air tightness of electric motors in new energy vehicles includes the following steps: To block the low-pressure signal interface, the first waterproof and breathable valve in the first waterproof and breathable valve interface is unscrewed, and the first waterproof and breathable valve interface is blocked using a first waterproof and breathable valve interface blocking tool. The PN interface is blocked to keep the second waterproof and breathable valve inside the second waterproof and breathable valve interface, and the second waterproof and breathable valve interface is blocked using a second waterproof and breathable valve blocking tool. The air outlet pipeline of the air tightness tester is split into a first air outlet branch pipeline and a second air outlet branch pipeline. The first air outlet branch pipeline is connected to the inner cavity of the motor body via the first waterproof and breathable valve interface sealing fixture, and the second air outlet branch pipeline is connected to the inner cavity of the electronic control device via the second waterproof and breathable valve interface sealing fixture. Turn on the air tightness tester and inflate the motor body and the electronic control device for t1. Cut off the air source and stabilize the pressure for t2. Calculate the pressure difference between the motor body and the electronic control device and compare it with the standard value to determine whether the air tightness of the motor is qualified.

2. The method for testing the airtightness of a new energy vehicle motor according to claim 1, characterized in that, The aforementioned method for testing the air tightness of electric motors in new energy vehicles is used to test the air tightness of a single electric motor. The low-voltage signal interface is sealed using a dedicated low-voltage signal interface sealing fixture, and the PN interface is sealed using a dedicated PN interface sealing fixture.

3. The method for testing the airtightness of a new energy vehicle motor according to claim 1, characterized in that, The aforementioned method for testing the air tightness of electric motors in new energy vehicles is used to test the air tightness of electric motors on the entire vehicle. A wire harness is installed inside the low-voltage signal interface to block the low-voltage signal interface, and a wire harness is installed inside the PN interface to block the PN interface.

4. The method for testing the airtightness of a new energy vehicle motor according to claim 2, characterized in that, The inflation pressure for inflating the motor body and the electronic control device is 18000Pa.

5. The method for testing the airtightness of a new energy vehicle motor according to claim 4, characterized in that, The inflation time t1 for inflating the motor body and the electronic control device is specifically 200 seconds.

6. The method for testing the airtightness of a new energy vehicle motor according to claim 5, characterized in that, The voltage stabilization time t2 for stabilizing the motor body and the electronic control device is specifically 45 seconds.

7. The method for testing the airtightness of a new energy vehicle motor according to claim 3, characterized in that, The inflation pressure for inflating the motor body and the electronic control device is 9000 Pa.

8. The method for testing the air tightness of a new energy vehicle motor according to claim 7, characterized in that, The inflation time t1 for inflating the motor body and the electronic control device is specifically 60 seconds.

9. The method for testing the airtightness of a new energy vehicle motor according to claim 8, characterized in that, The voltage stabilization time t2 for stabilizing the motor body and the electronic control device is specifically 10 seconds.

10. The method for testing the airtightness of a new energy vehicle motor according to claim 1, characterized in that, The second waterproof and breathable valve interface sealing fixture includes: A sealing cap is press-fitted onto the outside of the second waterproof and breathable valve interface, and a sealing gasket is provided between the sealing cap and the electronic control device; A pressure screw is disposed on the surface of the sealing cover opposite to the electronic control device to apply pressure to the sealing cover; A bracket is fixed to the motor body and / or the electronic control device, and the end of the screw away from the sealing cover is threadedly connected to the bracket.

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