Power system fault diagnosis equipment and method for pure electric vehicle development

Abstract

The invention belongs to the technical field of automobile fault detection, and particularly discloses a power system fault diagnosis device and method for pure electric vehicle development, and the device comprises a detection platform and a display screen disposed on the top surface of the detection platform. A power system of the electric vehicle is connected with the detection platform through a fault setting wire harness, a test plate is arranged on the top surface of the detection platform, and a plurality of test holes are formed in the surface of the test plate. The output connector is clamped by the clamping part, so that the plug at the bottom end of the output connector is vertically inserted into the test hole all the time, in the plug inserting process, the elastic frame is pulled by the connecting strip in the downward moving process of the sliding plate, the elastic frame deforms under the pulling condition, and the deformed elastic frame cooperatively pulls the two transverse rods; the stability of the clamping part on the surfaces of the two cross rods is improved, and the plug is prevented from moving out of the test hole due to simple collision.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile fault detection, and in particular relates to a power system fault diagnosis device and method for pure electric vehicle development. Background Art

[0002] The fault setting and detection connection platform is a multifunctional teaching device developed for pure electric vehicles, integrating system data collection, system measurement and control, fault setting and other functions. The pure electric vehicle is tested by the detector in conjunction with the fault setting and detection connection platform. The connection plug of the detector is correspondingly plugged into the plug interface on the top surface of the fault setting and detection connection platform. Since the connection plug and the plug interface are relatively simple to plug, the connection plug is very easy to fall off from the plug interface when subjected to external force, thereby affecting the test results.

[0003] Therefore, it is necessary to invent a power system fault diagnosis device and method for pure electric vehicle development to solve the above problems. Summary of the invention

[0004] In view of the above problems, the present invention provides a power system fault diagnosis device and method for pure electric vehicle development to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a power system fault diagnosis device developed for a pure electric vehicle, comprising a detection platform and a display screen installed on the top surface of the detection platform. The power system of the electric vehicle uses a fault setting harness to connect the detection platform, and a test board is provided on the top surface of the detection platform. A plurality of test holes are provided on the surface of the test board. Two output connectors of the detector are correspondingly plugged into the inner side of the test holes. Side rods are fixed on both sides of the top surface of the detection platform. Both ends of the side rods are fixedly connected to the top surface of the detection platform. A sliding sleeve is sleeved on the surface of the side rod. The two opposite sliding sleeves are connected by a Two parallel cross bars are fixedly connected, a clamping component for clamping the output connector is arranged on the top of the detection platform, and the clamping component is slidably sleeved on the surfaces of the two parallel cross bars, and the bottom surface of the clamping component is parallel to the top surface of the test plate, the clamping component includes two opposite semi-cylinders, the inner side surfaces of the semi-cylinders are provided with slots corresponding to the output connector, the two semi-cylinders both use the slots to clamp the output connector, a plug is arranged at the bottom end of the output connector, and the plug of the output connector is correspondingly plugged into the inner side of the test hole, the power system of the electric vehicle is detected by the detector, and the fault location is displayed on the display screen.

[0006] Furthermore, the clamping component also includes two opposing slides, both ends of the slides are slidably sleeved on the surfaces of the two cross bars, and rings are fixed on the tops of both ends of the slides. The two rings on the top of the slide correspond one to one with the two rings on the top of the other slide. A screw rod is spirally inserted at the center of the two opposing rings, and an internal thread is provided on the inner wall of the ring. The internal threads of the two opposing rings are in opposite directions, and the rotating screw rod makes the two opposing rings approach or move away from each other.

[0007] Furthermore, a shifting plate is fixed on the surface of the screw, and the screw is rotated by the shifting plate. A first spring is fixed on the inner side of the collar, and the first spring is sleeved on the surface of the screw, and the inner end of the first spring is in contact with the end surface of the shifting plate.

[0008] Furthermore, a slide plate is provided on the inner side of the slide, a slot corresponding to the semi-cylinder is provided on the inner side surface of the slide plate, a pressure plate is provided at the center of the outer side surface of the slide plate, a side frame corresponding to the pressure plate is fixed at the center of the inner side of the slide, a vertical rod is fixed at the center of the side frame, and the outer end of the pressure plate is sleeved on the surface of the vertical rod, a second spring is sleeved on the surface of the vertical rod, the bottom end of the second spring is connected to the center of the top surface of the pressure plate, and the top end of the second spring is connected to the inner top surface of the side frame.

[0009] Furthermore, an annular groove is provided on the inner side of the card slot of the slide plate, and two plug-in plates are plugged into the semi-cylindrical surface, the two plug-in plates correspond one to one with the two plugs, the inner ends of the plug-in plates are provided as arc-shaped surfaces, and the inner end surfaces of the plug-in plates fit closely to the outer side surfaces of the circumference of the plugs, and the outer ends of the plug-in plates are located on the inner side of the annular groove.

[0010] Furthermore, the semi-cylindrical surface is provided with a slot corresponding to the plug plate, the inner top and bottom surfaces of the slot are provided with sliding grooves, and the top and bottom surfaces of the plug plate are fixed with convex rods. When the movable plug plate moves inside the slot, the plug plate drives the convex rod to slide inside the sliding groove, and the surface of the convex rod is connected to the inner end of the sliding groove by a spring sheet. The spring sheet is in a compressed state, and the elastic force of the spring sheet makes the outer end of the plug plate fit against the inner wall of the annular groove.

[0011] Furthermore, an elastic frame is arranged on the outer side of the slide frame, and two ends of the elastic frame are respectively sleeved on the surfaces of the two cross bars, and the top surface of the elastic frame is connected to the top surface of the slide board by a connecting strip.

[0012] The present invention also provides a method for using the power system fault diagnosis device developed for the pure electric vehicle described above, comprising the following steps:

[0013] S1. Align the output connector with the slot of the semi-cylinder, and turn the dial plate. The dial plate drives the screw to rotate inside the collar. Since the internal threads of the two relative collars are in opposite directions, the rotating screw makes the two relative collars approach each other. The moving collar drives the slide to move synchronously. While the collar and the dial plate cooperate to squeeze the first spring, the slide squeezes the semi-cylinder with the slide plate. Both semi-cylinders use the slot to clamp the output connector.

[0014] S2. When the two slides approach each other, the slide uses the annular groove to squeeze the outer end of the plug plate. The plug plate moves inside the slot of the semi-cylinder under the drive of the slide plate, and the inner end of the moving plug plate gradually approaches the plug. The plug plate uses the convex rod to squeeze the spring sheet inside the slide slot during the movement, until the two semi-cylinders cooperate to clamp the output connector, and the two opposite plug plates cooperate to clamp the plug, completing the restriction of the output connector;

[0015] S3, push the sliding sleeve to move, and the sliding sleeve moves forward and backward on the surface of the side rod, while using the cross bar to drive the clamping component to move synchronously, and the clamping component can move left and right on the surface of the cross bar, so that the clamping component can drive the plug at the bottom of the output connector to correspond to the test hole on the top surface of the test board;

[0016] S4. Press the semi-cylinders, and the two semi-cylinders drive the output connector and the plug to move downward. The semi-cylinders drive the pressure plate to move downward inside the vertical rod of the side frame, and the downward pressure plate pulls the second spring on the surface of the vertical rod until the plug is correspondingly plugged into the inner side of the test hole, completing the electrical connection between the detector and the test platform. The detector can be used to test the power system of the electric vehicle through the test platform, and the test status can be displayed on the display screen;

[0017] S5. When the semi-cylinder uses the plug plate to drive the slide plate to move downward, the slide plate uses the connecting strip to pull the elastic frame during the downward movement. The elastic frame deforms under the pulling condition, and the deformed elastic frame cooperates to pull the two cross bars, so that the clamping component is stable on the surface of the two cross bars.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The present invention clamps the output connector by a clamping component, so that the plug at the bottom of the output connector is always vertically inserted into the test hole. During the plug insertion process, the slide uses the connecting strip to pull the elastic frame during the downward movement. The elastic frame is deformed under the pulling condition. The deformed elastic frame cooperates to pull the two cross bars, so that the clamping component is stable on the surface of the two cross bars, thereby preventing the plug from being moved out of the test hole due to a simple collision.

[0020] 2. The present invention rotates two semi-cylinders, which drive the two output connectors to rotate synchronously. That is, the semi-cylinders slide on the inner side of the ring groove of the slide plate using the plug plate, so that the positions of the two output connectors can be rotated according to the positions of the test holes, so that the plugs at the bottom ends of the two output connectors can correspond to the test holes on the top surface of the test board in real time.

[0021] 3. The present invention adjusts the relative distance between the two rings by rotating the screw. When the two relative rings approach each other, the two relatively close rings cooperate with the shift plate to clamp the first spring on the surface of the screw. The elastic force of the first spring prevents the inner end of the ring from quickly approaching the shift plate, thereby preventing the screw from rotating quickly due to the shifting of the shift plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of a power system fault diagnosis device developed for a pure electric vehicle according to an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of a clamping component cooperating to define an output connector according to an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of a slide frame according to an embodiment of the present invention using a side frame to cooperate with and restrict a slide plate;

[0025] Figure 4 is a schematic diagram of two slide plates cooperating to clamp two semi-cylinders according to an embodiment of the present invention;

[0026] Figure 5 is an overall schematic diagram of a skateboard according to an embodiment of the present invention;

[0027] In the figure: 1. detection platform; 2. display screen; 3. test board; 4. output connector; 5. side rod; 6. sliding sleeve; 7. cross bar; 8. semi-cylinder; 9. plug; 10. slide; 11. collar; 12. screw; 13. paddle plate; 14. first spring; 15. slide plate; 16. pressure plate; 17. side frame; 18. vertical rod; 19. second spring; 20. annular groove; 21. plug plate; 22. protruding rod; 23. spring piece; 24. elastic frame; 25. connecting strip. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0029] The present invention provides a power system fault diagnosis device for pure electric vehicles, such as Figures 1 to 4As shown, it includes a detection platform 1, and a display screen 2 installed on the top surface of the detection platform 1. The power system of the electric vehicle uses a fault setting harness to connect the detection platform 1, and a test board 3 is provided on the top surface of the detection platform 1. The surface of the test board 3 is provided with a plurality of test holes, and two output connectors 4 of the detector are correspondingly plugged into the inner side of the test holes. Side rods 5 are fixed on both sides of the top surface of the detection platform 1, and both ends of the side rods 5 are fixedly connected to the top surface of the detection platform 1. The surface of the side rod 5 is sleeved with a sliding sleeve 6, and the two opposite sliding sleeves 6 are fixedly connected by two parallel cross bars 7. A clamping component for clamping the output connector 4 is provided on the top of the platform 1, and the clamping component is slidably sleeved on the surfaces of two parallel cross bars 7, and the bottom surface of the clamping component is parallel to the top surface of the test board 3. The clamping component includes two opposite semi-cylinders 8, and the inner side of the semi-cylinder 8 is provided with a slot corresponding to the output connector 4. Both semi-cylinders 8 use the slot to clamp the output connector 4. A plug 9 is provided at the bottom of the output connector 4, and the plug 9 of the output connector 4 is correspondingly plugged into the inner side of the test hole. The power system of the electric vehicle is detected by the detector, and the fault position is displayed on the display screen 2. The two output connectors 4 of the detector are clamped by the clamping component, and the sliding sleeve 6 is pushed to move. The sliding sleeve 6 moves forward and backward on the surface of the side bar 5, and the cross bar 7 drives the clamping component to move synchronously. The clamping component can move left and right on the surface of the cross bar 7, so that the clamping component can drive the plug 9 at the bottom of the output connector 4 to correspond to the test hole on the top surface of the test board 3. By pressing the semi-cylinder 8, the two semi-cylinders 8 drive the output connector 4 and the plug 9 to move downward until the plug 9 is correspondingly plugged into the inner side of the test hole, thereby completing the electrical connection between the detector and the test platform 1. The detector can be used to test the power system of the electric vehicle through the test platform 1, and the test status can be displayed on the display screen 2.

[0030] exist Figure 2 and Figure 3 In the embodiment, the clamping component also includes two relative slides 10, the two ends of the slides 10 are respectively slidably sleeved on the surfaces of the two cross bars 7, and the tops of the two ends of the slides 10 are fixed with collars 11, the two collars 11 on the top of the slide 10 correspond one to one with the two collars 11 on the top of the other slide 10, and the centers of the two relative collars 11 are spirally plugged with screws 12, the inner side walls of the collars 11 are provided with internal threads, the internal threads of the two relative collars 11 are in opposite directions, and the rotating screw 12 makes the two relative collars 11 approach or move away from each other. When the screw 12 rotates, since the internal threads of the two relative collars 11 are in opposite directions, the rotating screw 12 makes the two relative collars 11 approach or move away from each other, and the moving collar 11 drives the slides 10 to move synchronously, which is convenient for real-time regulation of the relative distance between the two slides 10.

[0031] A paddle 13 is fixed on the surface of the screw 12, and the paddle 13 is used to paddle the screw 12 for rotation. A first spring 14 is fixed on the inner side of the collar 11, and the first spring 14 is sleeved on the surface of the screw 12, and the inner end of the first spring 14 is in contact with the end surface of the paddle 13. When two relatively opposite collars 11 approach each other, the relatively close collars 11 cooperate with the paddle 13 to clamp the first spring 14 on the surface of the screw 12, and the elastic force of the first spring 14 prevents the inner end of the collar 11 from quickly approaching the paddle 13, and prevents the screw 12 from quickly rotating due to the paddle 13.

[0032] exist Figure 2 and Figure 3 In the figure, a slide plate 15 is provided inside the slide 10, and a slot corresponding to the semi-cylinder 8 is provided on the inner side of the slide plate 15, and a pressure plate 16 is provided at the center of the outer side of the slide plate 15. A side frame 17 corresponding to the pressure plate 16 is fixed at the center of the inner side of the slide 10, and a vertical rod 18 is fixed at the center of the side frame 17, and the outer end of the pressure plate 16 is sleeved on the surface of the vertical rod 18, and a second spring 19 is sleeved on the surface of the vertical rod 18, and the bottom end of the second spring 19 is connected to the center of the top surface of the pressure plate 16, and the top end of the second spring 19 is connected to the inner top surface of the side frame 17. After the two slide plates 15 cooperate to clamp the two semi-cylinders 8, the two semi-cylinders 8 are used to complete the limitation of the output connector 4, and when the clamping component moves, the clamping component drives the output connector 4 to move synchronously until the plug 9 at the bottom of the output connector 4 corresponds to the test hole on the top surface of the test board 3. By pressing the semi-cylinder 8, the two semi-cylinders 8 drive the output connector 4 and the plug 9 to move downward, and the semi-cylinder 8 drives the pressure plate 16 to move downward on the inner side of the vertical rod 18 of the side frame 17, and the downwardly moved pressure plate 16 pulls the second spring 19 on the surface of the vertical rod 18 until the plug 9 is correspondingly plugged into the inner side of the test hole, thereby completing the electrical connection between the detector and the detection platform 1.

[0033] After testing, the semi-cylinder 8 is pulled upward, and the elastic force of the second spring 19 cooperates with the pressure plate 16 to pull the slide plate 15 upward. The upward semi-cylinder 8 pulls the plug 9 out of the test hole, and the clamping part is moved again until the plug 9 at the bottom of the output connector 4 corresponds to the other test holes on the top surface of the test board 3.

[0034] exist Figures 3 to 5 In the embodiment, the inner side of the slot of the slide plate 15 is provided with an annular groove 20, and two plug plates 21 are plugged into the surface of the semi-cylinder 8, and the two plug plates 21 correspond to the two plugs 9 one by one, and the inner side ends of the plug plates 21 are provided with an arc surface, and the inner side end faces of the plug plates 21 fit the outer side faces of the circumference of the plug 9, and the outer side ends of the plug plates 21 are located inside the annular groove 20. When the two opposing slide plates 15 use the two semi-cylinders 8 to clamp the output connector 4, the slide plates 15 drive the inner side ends of the plug plates 21 to press the surface of the plug 9, and the clamping of the two plug plates 21 ensures the stability of the plug 9 between the two semi-cylinders 8.

[0035] exist Figures 3 to 5 In the figure, a slot corresponding to the plug plate 21 is provided on the surface of the semi-cylinder 8, and a slide groove is provided on the top and bottom surfaces inside the slot. A convex rod 22 is fixed on the top and bottom surfaces of the plug plate 21. When the moving plug plate 21 moves inside the slot, the plug plate 21 drives the convex rod 22 to slide inside the slide groove. The surface of the convex rod 22 is connected to the inner end of the slide groove by a spring sheet 23. The spring sheet 23 is in a compressed state, and the elastic force of the spring sheet 23 makes the outer end of the plug plate 21 fit with the inner wall of the annular groove 20. When the two slides 15 approach each other, the slide 15 uses the annular groove 20 to squeeze the outer end of the plug 21. The plug 21 moves inside the slot of the semi-cylinder 8 under the drive of the slide 15, and the inner end of the moving plug 21 gradually approaches the plug 9. The plug 21 uses the convex rod 22 to squeeze the spring piece 23 inside the slide slot during the movement, until the two semi-cylinders 8 cooperate to clamp the output connector 4, and the two opposite plugs 21 cooperate to clamp the plug 9 to complete the restriction of the output connector 4. Rotate the two semi-cylinders 8, the two semi-cylinders 8 drive the two output connectors 4 to rotate synchronously, that is, the semi-cylinders 8 use the plug 21 to slide inside the annular groove 20 of the slide 15, so as to facilitate the rotation of the positions of the two output connectors 4 according to the positions of the test holes, so as to facilitate the real-time correspondence of the plugs 9 at the bottom of the two output connectors 4 with the test holes on the top surface of the test board 3.

[0036] exist Figure 1 and Figure 2 In the figure, an elastic frame 24 is arranged outside the slide 10, and the two ends of the elastic frame 24 are respectively sleeved on the surfaces of the two cross bars 7, and the top surface of the elastic frame 24 is connected to the top surface of the slide plate 15 by a connecting strip 25. When the semi-cylinder 8 drives the slide plate 15 to move downward by using the plug plate 21, the slide plate 15 pulls the elastic frame 24 by using the connecting strip 25 during the downward movement, and the elastic frame 24 is deformed under the pulling condition, and the deformed elastic frame 24 cooperates to pull the two cross bars 7, so that the clamping component is stable on the surfaces of the two cross bars 7.

[0037] The present invention also provides a method for using the power system fault diagnosis device developed by the above-mentioned pure electric vehicle, referring to Figures 1 to 5 As shown, the following steps are included:

[0038] S1. Align the output connector 4 with the slot of the semi-cylinder 8, and turn the dial plate 13. The dial plate 13 drives the screw 12 to rotate inside the collar 11. Since the internal threads of the two relative collars 11 are in opposite directions, the rotating screw 12 makes the two relative collars 11 approach each other. The moving collar 11 drives the slide 10 to move synchronously. While the collar 11 and the dial plate 13 cooperate to squeeze the first spring 14, the slide 10 uses the slide plate 15 to squeeze the semi-cylinder 8. Both semi-cylinders 8 use the slot to clamp the output connector 4.

[0039] S2. When the two slides 15 approach each other, the slide 15 uses the annular groove 20 to squeeze the outer end of the plug plate 21. Driven by the slide 15, the plug plate 21 moves inside the slot of the semi-cylinder 8, and the inner end of the moving plug plate 21 gradually approaches the plug 9. The plug plate 21 uses the protruding rod 22 to squeeze the spring piece 23 inside the slide groove during the movement, until the two semi-cylinders 8 cooperate to clamp the output connector 4, and the two opposite plug plates 21 cooperate to clamp the plug 9, thereby completing the limitation of the output connector 4.

[0040] S3. Push the sliding sleeve 6 to move. While the sliding sleeve 6 moves back and forth on the surface of the side rod 5, the cross bar 7 is used to drive the clamping component to move synchronously. The clamping component can move left and right on the surface of the cross bar 7, so that the clamping component can drive the plug 9 at the bottom of the output connector 4 to correspond to the test hole on the top surface of the test board 3.

[0041] S4. Press the semi-cylinder 8. The two semi-cylinders 8 drive the output connector 4 and the plug 9 to move downward. The semi-cylinder 8 drives the pressure plate 16 to move downward on the inner side of the vertical rod 18 of the side frame 17. The downward pressure plate 16 pulls the second spring 19 on the surface of the vertical rod 18 until the plug 9 is correspondingly plugged into the inner side of the test hole. The electrical connection between the detector and the test platform 1 is completed. The detector can be used to detect the power system of the electric vehicle through the test platform 1, and the detection status can be displayed on the display screen 2.

[0042] S5. When the semi-cylinder 8 drives the slide plate 15 to move downward using the plug plate 21, the slide plate 15 uses the connecting strip 25 to pull the elastic frame 24 during the downward movement. The elastic frame 24 deforms under the pulling condition. The deformed elastic frame 24 cooperates to pull the two cross bars 7, so that the clamping component is stable on the surface of the two cross bars 7.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A power system fault diagnosis device developed for a pure electric vehicle, comprising a detection platform (1), and a display screen (2) installed on the top surface of the detection platform (1), wherein the power system of the electric vehicle is connected to the detection platform (1) by a fault setting harness, and a test board (3) is arranged on the top surface of the detection platform (1), and a plurality of test holes are arranged on the surface of the test board (3), and two output connectors (4) of a detector are correspondingly plugged into the inner side of the test holes, characterized in that: Side rods (5) are fixed on both sides of the top surface of the detection platform (1), and both ends of the side rods (5) are fixedly connected to the top surface of the detection platform (1). A sliding sleeve (6) is sleeved on the surface of the side rod (5), and two opposite sliding sleeves (6) are fixedly connected by two parallel cross bars (7). A clamping component for clamping the output connector (4) is arranged on the top of the detection platform (1), and the clamping component is slidably sleeved on the surfaces of the two parallel cross bars (7), and the bottom surface of the clamping component is parallel to the top surface of the test plate (3). The clamping component includes two opposite semi-cylinders (8), and the inner side surface of the semi-cylinders (8) is provided with a slot corresponding to the output connector (4). The two semi-cylinders (8) both use the slot to clamp the output connector (4). A plug (9) is arranged at the bottom end of the output connector (4), and the plug (9) of the output connector (4) is correspondingly plugged into the inner side of the test hole. The power system of the electric vehicle is detected by the detector, and the fault position is displayed on the display screen (2).

2. The power system fault diagnosis device for pure electric vehicle development according to claim 1 is characterized in that: The clamping component also includes two opposing slides (10), the two ends of the slides (10) are respectively slidably sleeved on the surfaces of the two cross bars (7), and the tops of the two ends of the slides (10) are fixed with collars (11), the two collars (11) on the top of the slide (10) correspond one to one with the two collars (11) on the top of the other slide (10), a screw rod (12) is spirally inserted at the center of the two opposing collars (11), an inner wall of the collar (11) is provided with an internal thread, the internal threads of the two opposing collars (11) are in opposite directions, and the rotating screw rod (12) makes the two opposing collars (11) approach or move away from each other.

3. The power system fault diagnosis device for pure electric vehicle development according to claim 2 is characterized in that: A shifting plate (13) is fixed on the surface of the screw rod (12), and the screw rod (12) is rotated by shifting the shifting plate (13). A first spring (14) is fixed on the inner side of the collar (11), and the first spring (14) is sleeved on the surface of the screw rod (12), and the inner end of the first spring (14) is in contact with the end surface of the shifting plate (13).

4. The power system fault diagnosis device for pure electric vehicle development according to claim 2 is characterized in that: A slide plate (15) is arranged on the inner side of the slide frame (10), a slot corresponding to the semi-cylinder (8) is arranged on the inner side surface of the slide plate (15), a pressure plate (16) is arranged at the center of the outer side surface of the slide plate (15), a side frame (17) corresponding to the pressure plate (16) is fixed at the center of the inner side of the slide frame (10), a vertical rod (18) is fixed at the center of the side frame (17), and the outer end of the pressure plate (16) is sleeved on the surface of the vertical rod (18), and a second spring (19) is sleeved on the surface of the vertical rod (18), the bottom end of the second spring (19) is connected to the center of the top surface of the pressure plate (16), and the top end of the second spring (19) is connected to the inner top surface of the side frame (17).

5. The power system fault diagnosis device for pure electric vehicles according to claim 4 is characterized in that: An annular groove (20) is arranged inside the slot of the slide plate (15); two plug plates (21) are plugged into the surface of the semi-cylinder (8); the two plug plates (21) correspond to the two plugs (9) one by one; the inner ends of the plug plates (21) are arranged as arc-shaped surfaces; the inner end surfaces of the plug plates (21) fit closely to the outer circumferential surfaces of the plugs (9); and the outer ends of the plug plates (21) are located inside the annular groove (20).

6. The power system fault diagnosis device for pure electric vehicles according to claim 5, characterized in that: The surface of the semi-cylinder (8) is provided with a slot corresponding to the plug plate (21), and the inner top and bottom surfaces of the slot are both provided with a slide groove. The top and bottom surfaces of the plug plate (21) are both fixed with a protruding rod (22). When the movable plug plate (21) moves inside the slot, the plug plate (21) drives the protruding rod (22) to slide inside the slide groove. The surface of the protruding rod (22) is connected to the inner end of the slide groove by a spring sheet (23). The spring sheet (23) is in a compressed state. The elastic force of the spring sheet (23) makes the outer end of the plug plate (21) fit with the inner wall of the annular groove (20).

7. The power system fault diagnosis device for pure electric vehicles according to claim 6 is characterized by: An elastic frame (24) is arranged outside the slide frame (10), and two ends of the elastic frame (24) are respectively sleeved on the surfaces of the two cross bars (7), and the top surface of the elastic frame (24) is connected to the top surface of the slide plate (15) by means of a connecting strip (25).

8. A method for using the power system fault diagnosis device developed for a pure electric vehicle according to claim 7, characterized in that: The following steps are involved: S1. Align the output connector (4) with the slot of the semi-cylinder (8), and move the dial plate (13). The dial plate (13) drives the screw rod (12) to rotate inside the collar (11). Since the internal threads of the two relative collars (11) are in opposite directions, the rotating screw rod (12) makes the two relative collars (11) approach each other. The moving collar (11) drives the slide (10) to move synchronously. While the collar (11) and the dial plate (13) cooperate to squeeze the first spring (14), the slide (10) uses the slide plate (15) to squeeze the semi-cylinder (8). Both semi-cylinders (8) use the slot to clamp the output connector (4). S2, when the two slide plates (15) approach each other, the slide plate (15) uses the annular groove (20) to squeeze the outer end of the plug plate (21), and the plug plate (21) moves inside the slot of the semi-cylinder (8) driven by the slide plate (15), and the inner end of the moving plug plate (21) gradually approaches the plug (9), and the plug plate (21) uses the protruding rod (22) to squeeze the spring sheet (23) inside the slide groove during the movement, until the two semi-cylinders (8) cooperate to clamp the output connector (4), and the two opposite plug plates (21) cooperate to clamp the plug (9), thereby completing the restriction of the output connector (4); S3, pushing the sliding sleeve (6) to move, the sliding sleeve (6) moves forward and backward on the surface of the side rod (5) and uses the cross bar (7) to drive the clamping component to move synchronously, and the clamping component can move left and right on the surface of the cross bar (7), so that the clamping component can drive the plug (9) at the bottom end of the output connector (4) to correspond to the test hole on the top surface of the test board (3); S4, pressing the semi-cylinder (8), the two semi-cylinders (8) drive the output connector (4) and the plug (9) to move downward, the semi-cylinder (8) drives the pressure plate (16) to move downward inside the vertical rod (18) of the side frame (17), and the downwardly moved pressure plate (16) pulls the second spring (19) on the surface of the vertical rod (18) until the plug (9) is correspondingly plugged into the inside of the test hole, completing the electrical connection between the detector and the test platform (1), and the detector can be used to test the power system of the electric vehicle through the test platform (1), and the test status can be displayed on the display screen (2); S5. When the semi-cylinder (8) drives the slide plate (15) to move downward by using the plug plate (21), the slide plate (15) pulls the elastic frame (24) by using the connecting strip (25) during the downward movement. The elastic frame (24) deforms under the pulling condition. The deformed elastic frame (24) cooperates to pull the two cross bars (7), so that the clamping component is stable on the surface of the two cross bars (7).

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