A water spray testing method and system based on AGV (Automated Guided Vehicle) cart

Abstract

This application provides a water spraying test method and system based on an AGV (Automated Guided Vehicle) cart, relating to the field of battery pack testing technology. The method includes the following steps: Step S1: Input the drawing of the bottom surface of the battery pack into a PC, and mark the positions of bolts / rivets and the seam lines of the outer shell through image recognition or manual methods; Step S2: Determine a pointing range by taking an offset distance; Step S3: The AGV cart moves along an S-shaped scanning path, and the water gun sprays water onto the bottom surface of the battery pack; the water gun tilts and rotates in real time around a vertical line, pointing to the corresponding positions; after the center of the AGV cart moves into the pointing range of the seam line, the water gun tilts and points to the corresponding seam line. In this application, the AGV cart can automatically adjust the spray direction of the water gun on the moving path, so that the bolt / rivet fixing parts of the battery pack and the seam parts of the outer shell can be directly sprayed with water, improving the test intensity and ensuring the effectiveness of the waterproof test.

Description

Technical Field

[0001] This application relates to the field of battery pack testing technology, and in particular to a water spraying test method and system based on an AGV (Automated Guided Vehicle) vehicle. Background Technology

[0002] Car battery packs need to undergo various tests, among which the water spray test simulates the waterproof performance of electric vehicles under conditions such as rain and wading. It is an extreme test scenario. During the test, the battery is connected to the detection circuit and water is continuously sprayed onto the battery surface to observe whether there are any water leakage or electrical leakage problems.

[0003] AGVs achieve autonomous movement using technologies such as magnetic strips and lasers. Magnetic strip navigation is a common solution, with electromagnetic induction as the guiding method. It utilizes the electromagnetic field created by wires or magnetic strips buried in the ground, and controls steering by detecting differences in signal strength through onboard sensors. This mature technology can be applied to water spray testing on battery pack surfaces. During testing, the battery pack is placed horizontally on a bracket, and a water gun is mounted on the AGV, pointing vertically upwards. The AGV moves in an S-shaped scanning motion beneath the battery pack, spraying water across the entire surface. This process is repeated for sustained testing.

[0004] Regarding the aforementioned technologies, current automated testing methods all employ a scanning moving nozzle approach. This approach only provides a powerful water flow along the moving path, resulting in only splashed water being received outside the path, rather than a powerful water jet. If the bolt / rivet fixing parts of the battery pack or the seams of the outer casing are not directly exposed to the water flow, the purpose of rigorous testing cannot be achieved, and the testing intensity needs to be improved. Summary of the Invention

[0005] This application provides a water spraying test method and system based on an AGV (Automated Guided Vehicle) vehicle. The system can automatically adjust the spray direction of the water gun along the movement path, so that the bolt / rivet fixing parts of the battery pack and the seams of the outer shell can be directly sprayed with water, thereby improving the test intensity and ensuring the effectiveness of the waterproof test.

[0006] This application provides a water spraying test method based on an AGV (Automated Guided Vehicle) cart, which adopts the following technical solution: A water spraying test method based on an AGV (Automated Guided Vehicle) includes the following steps: Step S1: Input the drawing of the bottom of the battery pack into the PC, align the coordinates with the movement path of the AGV, and mark the positions of bolts / rivets and the seam lines of the outer shell through image recognition or manual methods. Step S2: Take an offset distance to define a pointing range. The pointing range is a square centered on the point or a rectangle centered on the seam line. Step S3: The AGV moves along an S-shaped scanning path, and the water gun sprays water onto the bottom of the battery pack, including the following control states: State 1: When the center of the AGV is outside the pointing range, the water gun remains vertically upward; State 2: After the center of the AGV trolley moves into the range of the point it points to, the water gun tilts and rotates around the vertical line in real time, pointing to the corresponding point. State 3: After the center of the AGV moves into the range of the seam line, the water gun tilts and points to the corresponding seam line. As the AGV moves, the pointing position of the water gun moves along the seam line. Status 4: After the center of the AGV moves out of the pointing range, the water gun returns to a vertically upward position.

[0007] By adopting the above technical solution, the AGV can adjust the spray direction of the water gun on the movement path, so that the bolt / rivet fixing parts of the battery pack and the seam parts of the outer shell can be directly sprayed with water, thereby improving the test intensity and ensuring the effectiveness of the waterproof test.

[0008] Optionally, the movement of the AGV includes outbound and return trips. During the outbound trip, the water gun is always kept in a vertical position, and during the return trip, the control of state one to state four is activated.

[0009] By adopting the above technical solution, the outbound spraying is uniform, which is conducive to completely wetting the battery pack, while the return spraying focuses on key areas to achieve the goal of no dead corners and high standards.

[0010] Optionally, when the center of the AGV is outside the pointing range, compressed air is introduced into the nozzle of the water gun to reduce the speed of the water pump.

[0011] By adopting the above technical solution, water resources can be significantly saved, and unnecessary waste of water in the intact parts of the battery pack casing can be reduced. Compared to a purely water-based spray method, spraying compressed air and water together has little impact on water flow velocity and impact force, while still maintaining good test results.

[0012] Secondly, this application provides a water spraying test system based on an AGV (Automated Guided Vehicle) cart, employing the following technical solution: A water spray testing system based on an AGV (Automated Guided Vehicle) includes a bracket, a battery pack, an AGV, a PC, and magnetic strips fixed to the ground. The AGV includes a body and electric wheels. The body is equipped with a servo motor and a base driven by the servo motor. A rotating plate is rotatably connected to the base. An electric cylinder is hinged between the rotating plate and the base. A water gun is fixed on the rotating plate. A nozzle is fixed to the upper end of the water gun, and a water pipe is connected to the lower end of the water gun. The rotation axis of the base is a vertical line to realize the rotation of the water gun, and the rotation axis of the rotating plate is a horizontal line to realize the tilting of the water gun.

[0013] By adopting the above technical solution, the AGV moves along an S-shaped scanning path, with the path based on magnetic strips on the ground. A water gun sprays water onto the bottom surface of the battery pack. The base's rotation axis is vertical, used to rotate the water gun, while the rotating plate's rotation axis is horizontal, used to tilt the water gun. A servo motor drives the base's rotation, and an electric cylinder drives the rotating plate's rotation, achieving real-time alignment of the water gun at specific positions. During the AGV's movement, the water gun adjusts its orientation in real time to achieve real-time alignment.

[0014] Optionally, the output end of the servo motor is fixed with a first gear, the vehicle body is rotatably connected with a second gear, the first gear meshes with the second gear, the seat is fixed on the second gear, and the diameter of the first gear is smaller than that of the second gear.

[0015] By adopting the above technical solution and forming a deceleration structure, the accuracy of the seat rotation angle is improved.

[0016] Optionally, a flexible waterproof sleeve is fixed to the top surface of the vehicle body, the lower end of the waterproof sleeve is fixed and sealed to the top surface of the vehicle body, and the upper end of the waterproof sleeve is fixed and sealed to the outer wall of the water gun.

[0017] By adopting the above technical solution, water is prevented from entering the vehicle body through the waterproof sleeve, and the rotation angle of the water gun is not affected.

[0018] Optionally, the nozzle has a gas inlet on its side wall, and the gas inlet is connected to a gas pipe.

[0019] By adopting the above technical solution, an optional water-air mixing injection procedure is added, which helps to save water resources.

[0020] Optionally, the water pipe and air pipe are positioned close together and secured with cable ties. The outer end of the water pipe is connected to a water pump, and the outer end of the air pipe is connected to a compressed air source via a solenoid valve.

[0021] By adopting the above technical solution, the layout and control of the airway are facilitated.

[0022] Optionally, an annular push plate is fixed to the bottom of the vehicle body, the push plate is located outside the electric wheel, and the lower end of the push plate is close to the ground.

[0023] By adopting the above technical solution, the push plate is used to move the water pipe, preventing the electric wheel from pressing on the water pipe.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The AGV can automatically adjust the spray direction of the water gun on the moving path so that the bolt / rivet fixing parts of the battery pack and the seam of the outer shell can be directly sprayed with water, which improves the test intensity and ensures the effect of the waterproof test. 2. The outbound spray is uniform, which is conducive to completely wetting the battery pack. The return spray focuses on key areas to achieve the goal of no dead corners and high standard. 3. By using the air-water mixed spray function, water resources can be saved in large quantities, unnecessary waste of water on the intact parts of the battery pack casing can be reduced, and the impact on water flow speed and impact force is not obvious, still maintaining good test results. Attached Figure Description

[0025] Figure 1 This is a front view structural diagram of a water spraying test system based on an AGV vehicle, as described in Embodiment 1. Figure 2 This is a schematic diagram of the working principle of Example 1; Figure 3 This is a diagram of the internal structure of the nozzle in Example 1; Figure 4 This is a schematic diagram of the pointing range in the water spray test method of Example 2 (the dashed line represents the pointing range); Figure 5 This is a composite image of the bottom surface of the battery pack and the movement trajectory of the AGV trolley in Example 2.

[0026] Explanation of reference numerals in the attached diagram: 10. Bracket; 1. Battery pack; 2. AGV trolley; 101. Magnetic strip; 21. Car body; 22. Electric wheel; 31. Servo motor; 32. Seat; 33. Gear 1; 34. Gear 2; 35. Turning plate; 36. Electric cylinder; 3. Water gun; 4. Nozzle; 37. Water pipe; 23. Waterproof sleeve; 41. Air pipe; 42. Air chamber; 43. Cable tie; 24. Push plate; 11. Point; 12. Seam line. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1:

[0029] Reference Figure 1 This embodiment discloses a water spraying test system based on an AGV (Automated Guided Vehicle) trolley, including a bracket 10, a battery pack 1, an AGV trolley 2, a PC (Preinstallation Unit), and a magnetic strip 101 fixed to the ground. The PC serves as the control system. The battery pack 1 is fixed on the bracket 10 with its bottom surface exposed. The AGV trolley 2 is located in the space below the battery pack 1 and follows a trajectory determined by the magnetic strip 101 on the ground.

[0030] Reference Figure 1 and Figure 2The AGV trolley 2 includes a body 21 and electric wheels 22. The body 21 is equipped with a servo motor 31 and a seat 32 driven by the servo motor 31. Specifically, a gear 33 is fixed at the output end of the servo motor 31, and a gear 34 is rotatably connected to the body 21. The gear 33 meshes with the gear 34, and the seat 32 is fixed on the gear 34. The diameter of the gear 33 is smaller than that of the gear 34. By forming a reduction structure, the accuracy of the rotation angle of the seat 32 is improved.

[0031] A rotating plate 35 is rotatably connected to the base 32. An electric cylinder 36 is hinged between the rotating plate 35 and the base 32. A water gun 3 is fixed on the rotating plate 35, with a nozzle 4 fixed to the upper end of the water gun 3 and a water pipe 37 connected to the lower end of the water gun 3. The rotation axis of the base 32 is vertical, used to realize the rotation of the water gun 3, while the rotation axis of the rotating plate 35 is horizontal, used to realize the tilting of the water gun 3. The servo motor 31 drives the base 32 to rotate, and the electric cylinder 36 drives the rotating plate 35 to rotate, so that the water gun 3 can be aligned to a specific position. During the movement of the AGV trolley 2, the water gun 3 achieves real-time alignment by adjusting its orientation in real time.

[0032] By cooperating with the base 32 and the rotating plate 35, the rotation center of the water pipe 37 is set at the center of the AGV trolley 2, so that the upper end of the water pipe 37 can swing within the space, similar to the cooperation structure of a ball pin and a ball shell.

[0033] A flexible waterproof sleeve 23 is fixed to the top surface of the vehicle body 21. The waterproof sleeve 23 is a corrugated tube structure made of rubber. The lower end of the waterproof sleeve 23 is fixed and sealed to the top surface of the vehicle body 21, and the upper end of the waterproof sleeve 23 is fixed and sealed to the outer wall of the water gun 3. Water is prevented from entering the vehicle body 21 by the waterproof sleeve 23.

[0034] Reference Figure 1 and Figure 3 The nozzle 4 has a gas inlet on its side wall, which is connected to an air pipe 41. The nozzle 4 has an air chamber 42 inside, which is connected to the water outlet of the nozzle 4 through an inclined channel. After the air pipe 41 is connected to compressed air, the compressed air can be sprayed out along with water.

[0035] Water pipe 37 and air pipe 41 are positioned close together and secured with cable ties 43. Both water pipe 37 and air pipe 41 have a relatively long design, and are dragged along by the AGV trolley 2 as it moves. The water and air sources for the AGV trolley 2 are external. The outer end of water pipe 37 is connected to a water pump, and the pump's suction port is connected to a water tank. The outer end of air pipe 41 is connected to a compressed air source via a solenoid valve. A ring-shaped push plate 24 is fixed to the bottom of the trolley body 21. The push plate 24 is located outside the electric wheel 22, with its lower end close to the ground. The push plate 24 is used to move the water pipe 37, preventing the electric wheel 22 from pressing on it.

[0036] Example 2:

[0037] A water spraying test method based on an AGV (Automated Guided Vehicle) cart, using a water spraying test system based on an AGV cart as described in Example 1, includes the following steps: Step S1: Refer to Figure 4 The drawing of the bottom surface of battery pack 1 is input into the PC and aligned with the coordinates of the AGV trolley 2's movement path. The bolt / rivet points 11 and the seam lines 12 of the outer shell are marked using image recognition or manual methods. The drawing of battery pack 1 is in electronic format, a two-dimensional drawing, and the scale of the drawing is the same as the scale of the AGV trolley 2's movement path, which is 1:1 to ensure complete correspondence.

[0038] Step S2: Define a pointing range by taking an offset distance. The pointing range is a square centered on point 11, or a rectangle centered on seam line 12. This range is implemented on the PC via software. The specific logic is as follows: point 11 is moved one offset distance in each of the four directions (forward, backward, left, and right), and a square is constructed using these four offset points as the midpoints of the edges; seam line 12 is moved one offset distance to each of the two sides, and a rectangle is constructed using these two offset lines as the two long sides of the rectangle.

[0039] Step S3: Refer to Figure 5 The AGV trolley 2 moves along an S-shaped scanning path, with the path based on the magnetic strip 101 on the ground. The water gun 3 sprays water onto the bottom surface of the battery pack 1. The control states include the following: State 1: When the center of AGV trolley 2 is outside the pointing range, water gun 3 remains vertically upward; State Two: Combination Figure 4 and Figure 5 After the center of the AGV trolley 2 moves into the range of the pointing point 11, the water gun 3 tilts and rotates around the vertical line in real time, pointing to the corresponding point 11. State 3: Combination Figure 4 and Figure 5 After the center of the AGV trolley 2 moves into the pointing range of the seam line 12, the water gun 3 tilts and points to the corresponding seam line 12. As the AGV trolley 2 moves, the pointing position of the water gun 3 moves along the seam line 12. State 4: After the center of AGV trolley 2 leaves the pointing range, water gun 3 returns to its vertical upward position.

[0040] The rotation center of water pipe 37 is set at the center of AGV trolley 2, and the position center of AGV trolley 2 in the coordinate diagram is the rotation center of water pipe 37. If the pointing range of point 11 and the pointing range of seam line 12 overlap, point 11 is given priority.

[0041] Combined with reference Figure 2 , Figure 4 and Figure 5For automatic pointing, the start / stop times and running speeds of the servo motor 31 and electric cylinder 36 have been set in the control system to achieve automatic pointing. The specific logic is as follows: the PC control system uses an accurate coordinate graph to construct each key position, and the real-time distance between each key position can be directly obtained from the PC control system. The distance between the rotation center of the water pipe 37 and the bottom surface of the battery pack 1 is a fixed value. The distance directly above the rotation center and point 11 or seam line 12 is calculated in the PC. These two distance lines are perpendicular to each other, therefore, at each time point, a corresponding tilt angle of the water gun 3 can be achieved, ensuring that the water gun 3 is aligned with the required position. For states two and three, the tilt angle of the water gun 3 during actual operation is no greater than 15 degrees.

[0042] The movement of the AGV trolley 2 includes the outward and return journeys. During the outward journey, the water gun 3 remains vertical, while during the return journey, control functions from state one to state four are activated. This setup ensures uniform spraying during the outward journey, which is beneficial for completely wetting the battery pack 1, while the return journey focuses on spraying key areas to achieve a high standard with no blind spots.

[0043] When the center of the AGV trolley 2 is outside the pointing range, compressed air is introduced into the nozzle 4 of the water gun 3 to reduce the water pump speed. This step is used selectively and can save a lot of water resources, reducing unnecessary waste of water on the intact parts of the battery pack 1 casing. By spraying compressed air and water together, the impact on water flow speed and impact force is not significant compared to a completely water-based spray, and good test results are still maintained.

[0044] In summary, this water spray test method and system can automatically adjust the spray direction of the water gun 3 along the movement path, so that the bolt / rivet fixing parts of the battery pack 1 and the seam parts of the outer shell can be directly sprayed with water, thereby improving the test intensity and ensuring the effectiveness of the waterproof test.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water spraying test method based on an AGV (Automated Guided Vehicle) cart, characterized in that: Includes the following steps: Step S1: Input the drawing of the bottom surface of the battery pack (1) into the PC, align the coordinates with the movement path of the AGV car (2), and mark the bolt / rivet points (11) and the seam line (12) of the shell by image recognition or manual means. Step S2: Take an offset distance to define a pointing range. The pointing range is a square centered on point (11) or a rectangle centered on the seam line (12). Step S3: The AGV (2) moves along an S-line scanning path, and the water gun (3) sprays water onto the bottom surface of the battery pack (1), including the following control states: State 1: When the center of the AGV trolley (2) is outside the pointing range, the water gun (3) remains vertically upward; State 2: After the center of the AGV car (2) moves to the range of the pointing point (11), the water gun (3) tilts and rotates around the vertical line in real time, pointing to the corresponding point (11); State 3: After the center of the AGV car (2) moves into the pointing range of the seam line (12), the water gun (3) tilts and points to the corresponding seam line (12). As the AGV car (2) moves, the pointing position of the water gun (3) moves along the seam line (12). State 4: After the center of the AGV trolley (2) leaves the pointing range, the water gun (3) returns to the vertical upward state.

2. The water spraying test method based on an AGV (Automated Guided Vehicle) as described in claim 1, characterized in that: The movement of the AGV (2) includes the outbound and return journeys. During the outbound journey, the water gun (3) always remains in a vertical position. During the return journey, the control of state one to state four is activated.

3. The water spraying test method based on an AGV (Automated Guided Vehicle) according to claim 1, characterized in that: When the center of the AGV (2) is outside the pointing range, compressed air is introduced into the nozzle (4) of the water gun (3) to reduce the speed of the water pump.

4. A water spraying test system based on an AGV (Automated Guided Vehicle) for use in the water spraying test method based on an AGV as described in claim 1, comprising a bracket (10), a battery pack (1), an AGV (2), a PC, and a magnetic strip (101) fixed to the ground, wherein the AGV (2) comprises a body (21) and electric wheels (22), characterized in that: The vehicle body (21) is equipped with a servo motor (31) and a seat (32) driven by the servo motor (31) to rotate. A rotating plate (35) is rotatably connected to the seat (32). An electric cylinder (36) is hinged between the rotating plate (35) and the seat (32). A water gun (3) is fixed on the rotating plate (35). A nozzle (4) is fixed at the upper end of the water gun (3). A water pipe (37) is connected to the lower end of the water gun (3). The rotation axis of the seat (32) is a vertical line, which is used to realize the rotation of the water gun (3). The rotation axis of the rotating plate (35) is a horizontal line, which is used to realize the tilting of the water gun (3).

5. The water spray testing system based on an AGV (Automated Guided Vehicle) as described in claim 4, characterized in that: The output end of the servo motor (31) is fixed with a gear one (33), and the vehicle body (21) is rotatably connected with a gear two (34). The gear one (33) meshes with the gear two (34), and the seat (32) is fixed on the gear two (34). The diameter of the gear one (33) is smaller than that of the gear two (34).

6. The water spraying test system based on an AGV vehicle according to claim 4, characterized in that: A flexible waterproof sleeve (23) is fixed to the top surface of the vehicle body (21). The lower end of the waterproof sleeve (23) is fixed and sealed to the top surface of the vehicle body (21), and the upper end of the waterproof sleeve (23) is fixed and sealed to the outer wall of the water gun (3).

7. The water spray testing system based on an AGV (Automated Guided Vehicle) as described in claim 4, characterized in that: The nozzle (4) has a gas inlet on its side wall, and the gas inlet is connected to a gas pipe (41).

8. The water spraying test system based on an AGV vehicle according to claim 7, characterized in that: The water pipe (37) and air pipe (41) are positioned close to each other and secured by cable ties (43). The outer end of the water pipe (37) is connected to a water pump, and the outer end of the air pipe (41) is connected to a compressed air source via a solenoid valve.

9. A water spraying test system based on an AGV (Automated Guided Vehicle) according to claim 8, characterized in that: A ring-shaped push plate (24) is fixed to the bottom of the vehicle body (21). The push plate (24) is located outside the electric wheel (22), and the lower end of the push plate (24) is close to the ground.

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