A battery case sealing property detection device

Abstract

The application discloses a kind of battery box sealing detection device, it is related to battery box sealing detection technical field, including machine body, parting device and deployment device, detection cavity is set on machine body, parting device includes side seal plate, face seal plate and supporting plate, face seal plate and supporting plate are oppositely arranged, deployment device includes several booster pipes and sensing components, side seal plate, face seal plate and supporting plate are connected with detection cavity respectively, sensing components are respectively arranged on the side of battery box of side seal plate, face seal plate and supporting plate, the gap between side seal plate, face seal plate and supporting plate and battery box is detection gap, battery box is located between supporting plate and face seal plate, the number of side seal plate and the number of side of battery box are adapted, several booster pipes are sequentially communicated with detection gap respectively, battery box is filled with water vapor.In the sealing detection of battery box, the whole detection process is subdivided into multiple parts.

Description

Technical Field

[0001] This invention relates to the field of battery box sealing test technology, specifically a battery box sealing test device. Background Technology

[0002] The battery box typically serves as the power source for electric vehicles, providing power, housing battery modules, and also acting as a protection and heat dissipation unit. Electrolyte is sealed inside the battery. During the manufacturing process of electric vehicle components, the sealing performance requirements for the battery box are relatively high.

[0003] Currently, most leak detection equipment uses a holistic testing approach, typically directly introducing high-pressure gas into the battery box. When a leak occurs, the gas flows out from the leak point. For example, the prior art document with application number CN202110238106.5 describes a battery box airtightness testing fixture that directly inputs gas into the battery box. When the gas flows out of the battery box outlet, changes in magnetic resistance are detected to measure the gas pressure, thus performing a leak test. However, when the leak point in the battery box is small, the instantaneous leakage is low, and the pressure fluctuation is minimal, which can easily lead to detection errors. Furthermore, using long-term leak detection would result in excessively long testing times, affecting continuous production efficiency.

[0004] In addition, during the overall testing process, only sealing failure can generally be identified, but the leak point cannot be automatically located, requiring an additional locating device, which affects the testing efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing test device for battery boxes, so as to solve the problems of low overall testing accuracy and efficiency in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The sealing performance testing device includes a body, a sorting device, and a dispensing device; A detection chamber is set on the machine body; The parting device includes a side sealing plate, a front sealing plate, and a support plate, with the front sealing plate and the support plate arranged facing each other. The dispensing device includes several booster tubes and sensing components; The side sealing plate, front sealing plate, and tray are connected to the detection chamber. The side sealing plate, front sealing plate, and tray are equipped with sensing components on the side facing the battery box. The gap between the side sealing plate, front sealing plate, and tray and the battery box is set as the detection gap. The battery box is located between the tray and the front sealing plate. The number of side sealing plates is matched with the number of sides of the battery box. Several booster pipes are connected to the detection gap in sequence. The battery box is filled with water vapor.

[0007] When performing a sealing test on the battery box, this application divides the entire testing process into multiple parts. For example, the battery box is sealed with a side sealing plate, and a single-sided horizontal circumferential test is performed on the battery box, i.e., side inspection. After the side inspection, the top surface of the battery box is sealed with a face sealing plate, and the top surface of the battery box is tested, i.e., face inspection, at which point the battery box is placed on a tray. After the face inspection, the battery box is moved upward by a parting device, making the testing gap between the tray and the battery box visible. The testing gap can be at the millimeter level. By performing step-by-step testing, the space for a single test is reduced. If there is a sealing failure in the part of the battery box to be tested, the proportion of instantaneous leakage in the testing gap is increased compared to the proportion of the overall space tested, thus improving the testing accuracy. During the side inspection, only one side is tested at a time. Initially, water vapor is injected into the battery box and sealed. After sealing, it is placed in the testing chamber. If the seal on the edge of the battery box to be tested fails, water vapor leaks from the battery box and enters the testing gap, increasing the humidity at the leakage point. This causes the circuit of the sensing component to conduct, automatically detecting the sealing performance.

[0008] Furthermore, the sensing component includes several substrates and electrodes, with protrusions on one side of the substrates; The electrode is connected to the battery box. Several base plates are provided on one side of the side sealing plate, the front sealing plate, and the support plate. The protrusions and the electrode are electrically connected to the two terminals of the power supply.

[0009] The sensing component uses electrical signal detection. The protrusions and electrodes are electrically connected to two terminals of the power supply, forming a sensing circuit. The electrodes are attached to the battery box. When the battery box seal fails, high-pressure water vapor inside the battery box leaks from the seal failure point under pressure. As the humidity increases, the circuit between the battery box and the corresponding protrusion becomes conductive, generating a current signal, thereby detecting the battery box's sealing performance. Several base plates are set on the side sealing plate, front sealing plate, and support plate for mounting the protrusions. During different stages of detection, several sensing circuits are formed, each corresponding to a detection range, thus automatically locating the battery box leakage point.

[0010] Furthermore, the dispensing device also includes several negative pressure pipes; Negative pressure pipes are provided on the side sealing plate, the front sealing plate, and the support plate respectively; During border inspection: the negative pressure pipes closest to the area to be inspected are opened first, and the negative pressure pipes in other areas are closed; After border inspection: The negative pressure pipe in the inspected area is closed, and the booster pipe is opened.

[0011] For example, when inspecting the four sides of a battery box, during the inspection of the first side, air is first evacuated through a negative pressure pipe to create a low-pressure environment in the inspection gap, while the other inspection gaps remain at normal pressure. If a leak is detected at this point, moisture from inside the battery box directly enters the inspection gap, improving detection accuracy. Simultaneously, several protrusions, after conducting electricity, activate the corresponding sensing circuits, automatically locating the leak point. After this inspection is completed, a pressurization pipe pressurizes the inspection gap. If a leak is detected, pressurization prevents continued leakage from inside the battery box, reducing the pressure difference and ensuring subsequent inspection accuracy. Each inspection gap is equipped with a pressure sensor. When moisture cannot leak from inside the battery box to the outside, the pressure is increased to make the pressure in the inspection gap greater than the moisture pressure inside the battery box, thus forming a bidirectional detection path. This prevents a single detection path from causing impurities to clog the leak point and affecting detection accuracy.

[0012] Furthermore, the parting device also includes several pressure cylinders, and the machine body is provided with several drive chambers. The pressure cylinders are respectively placed in the drive chambers, and the output ends of the pressure cylinders are respectively connected to the adjacent side sealing plate, face sealing plate and support plate.

[0013] Initially, the battery box is placed on the pallet. Then, the pressure cylinder outputs displacement, driving the side sealing plate and the front sealing plate to move, thus fully enclosing the battery box for easy type identification testing. To improve testing accuracy, sealing gaskets can be used to ensure a tight seal at the contact points. After testing, the battery box is lifted by the pressure cylinder-driven pallet, facilitating continuous testing.

[0014] Furthermore, the joint surfaces of adjacent side sealing plates are arranged at an angle.

[0015] The side sealing plates are arranged at an angle, which facilitates the horizontal circumferential division of the battery box.

[0016] Furthermore, the parting device also includes a lifting assembly, which is connected to the face sealing plate, with the adsorption end of the lifting assembly facing the battery box; During the inspection: the battery box is placed on a pallet; During bottom detection: The lifting assembly moves the battery box upward, creating a detection gap between the tray and the battery box.

[0017] By setting up a lifting component, after the edge inspection and surface inspection are completed, the lifting component on the face sealing plate drives the battery box to move upward, thereby creating a detection gap between the tray and the battery box. The support part will not block the part to be inspected, thus improving the detection accuracy.

[0018] As an optimization, the lifting assembly includes a lifting cylinder, the output end of which is provided with a central tube, and the lower end of the central tube is provided with a suction nozzle, which is connected to a negative pressure air source. The faceplate has a pull-out hole; The lifting cylinder is mounted on the faceplate, with the central tube and lifting hole movably connected. The lifting cylinder is installed via the faceplate and is used for output displacement, driving the suction nozzle to move via the central tube. During edge and surface inspections, the portion of the suction nozzle connected to the negative pressure air source is cut off. During bottom inspection, the suction nozzle is driven downwards, and the suction causes the battery box to move upwards. The lifting hole guides the sliding of the central tube.

[0019] As an optimization, a bypass hole is provided on one side of the central tube; The faceplate is equipped with a negative pressure suction hole, which is connected to a negative pressure air source; During lifting: The bypass hole and the negative pressure suction hole are connected. By setting a bypass hole on the central tube, the negative pressure suction hole is connected to the negative pressure air source. During edge and surface inspections, the bypass hole and the negative pressure suction hole are misaligned, and the negative pressure flow path is cut off. During bottom inspection, as the central tube moves downward, the bypass hole gradually connects with the negative pressure suction hole, thereby achieving automatic adsorption.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the entire inspection process is subdivided into multiple parts. For example, by sealing the battery box with a side sealing plate, a single-sided inspection is first performed on the horizontal circumference of the battery box, i.e., side inspection; after the side inspection is completed, the upper surface of the battery box is sealed with a face sealing plate, thereby inspecting the upper surface of the battery box, i.e., face inspection, at which time the battery box is placed on a pallet; after the face inspection is completed, the battery box is moved upward by a parting device, so that the inspection gap between the pallet and the battery box is revealed. The inspection gap can be at the millimeter level. By step-by-step inspection, the space for a single inspection is reduced. If the part of the battery box to be inspected... If a seal failure exists, the proportion of instantaneous leakage in the detection gap increases compared to the overall space detection ratio, thus improving detection accuracy. If the seal on the edge of the battery box to be tested fails, moisture leaks from inside the battery box and enters the detection gap, increasing the humidity at the leak point. This causes the circuit of the sensing component to conduct, enabling automatic detection of the seal. Several substrates are set on the side sealing plate, face sealing plate, and support plate for mounting the protrusions. During different stages of detection, several sensing circuits are formed, each corresponding to a detection interval, thereby automatically locating the leak point in the battery box. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the parting device structure of the present invention; Figure 3 This is a schematic diagram of the sensing component structure of the present invention; Figure 4 This is a schematic diagram of the horizontal border inspection of the present invention; Figure 5 This is a schematic diagram of the lifting component structure of the present invention; Figure 6For the present invention Figure 5 A magnified view of a portion of the view (A).

[0022] In the diagram: 1. Body; 11. Detection chamber; 12. Drive chamber; 2. Separation device; 21. Side sealing plate; 22. Face sealing plate; 221. Lifting hole; 222. Negative pressure suction hole; 23. Support plate; 24. Pressure cylinder; 25. Lifting assembly; 251. Lifting cylinder; 252. Central tube; 2521. Bypass hole; 253. Suction nozzle; 3. Mixing device; 31. Pressure boosting tube; 32. Sensing assembly; 321. Substrate; 322. Protrusion; 323. Electrode; 33. Negative pressure tube; 4. Battery box. Detailed Implementation

[0023] 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.

[0024] Example: Figures 1-6 As shown, the present invention provides a technical solution for a sealing performance testing device for battery boxes.

[0025] The sealing performance testing device includes a body 1, a sorting device 2, and a mixing device 3; A detection chamber 11 is provided on the body 1; The parting device 2 includes a side sealing plate 21, a front sealing plate 22 and a support plate 23, with the front sealing plate 22 and the support plate 23 arranged facing each other; The dispensing device 3 includes several booster tubes 31 and sensing components 32; Side sealing plate 21, face sealing plate 22 and support plate 23 are respectively connected to detection chamber 11. The side sealing plate 21, face sealing plate 22 and support plate 23 are respectively provided with sensing components 32 on the side facing the battery box 4. The gap between the side sealing plate 21, face sealing plate 22 and support plate 23 and the battery box 4 is set as detection gap. The battery box 4 is located between support plate 23 and face sealing plate 22. The number of side sealing plates 21 is matched with the number of sides of the battery box 4. Several booster pipes 31 are connected to the detection gap in sequence. The battery box 4 is filled with water vapor.

[0026] When performing a sealing test on the battery box 4, this application divides the entire testing process into multiple parts. For example, the battery box 4 is sealed by the side sealing plate 21, and a single-sided test is first performed on the horizontal circumference of the battery box 4, i.e., the side inspection. After the side inspection is completed, the upper surface of the battery box 4 is sealed by the face sealing plate 22, and the upper surface of the battery box 4 is then tested, i.e., the face inspection. At this time, the battery box 4 is placed on the tray 23. After the face inspection is completed, the battery box 4 is moved upward by the parting device 2, so that the test gap between the tray 23 and the battery box 4 is revealed. The test gap can be at the millimeter level. By performing step-by-step testing, the space for a single test is reduced. If there is a sealing failure in the part of the battery box 4 to be tested, the proportion of instantaneous leakage in the test gap is increased compared with the proportion of the overall space test, thereby improving the test accuracy. During the border inspection process, only one side is inspected at a time. Initially, water vapor is injected into the battery box 4 and sealed. After sealing, it is placed in the detection chamber 11. If the seal of the side line to be inspected in the battery box 4 fails, water vapor will leak from the battery box 4 and enter the detection gap, increasing the humidity at the leakage point. This will cause the circuit of the sensing component 32 to be turned on, and the sealing performance will be automatically detected.

[0027] Furthermore, the sensing component 32 includes several substrates 321 and electrode plates 323, and a protrusion 322 is provided on one side of the substrate 321; The electrode 323 is connected to the battery box 4. Several substrates 321 are respectively provided on one side of the side sealing plate 21, the front sealing plate 22 and the support plate 23. The protrusions 322 and the electrode 323 are electrically connected to the two terminals of the power supply.

[0028] The sensing component 32 uses electrical signal detection. The protrusions 322 and the electrode 323 are electrically connected to two terminals of the power supply, forming a sensing circuit. The electrode 323 is attached to the battery box 4. When the battery box 4 fails to seal, the high-pressure water vapor inside the battery box 4 leaks from the seal failure point under pressure. As the humidity increases, the circuit between the battery box 4 and the corresponding protrusions 322 becomes conductive, generating a current signal, thereby detecting the sealing performance of the battery box 4. Several substrates 321 are respectively set on the side sealing plate 21, the front sealing plate 22, and the support plate 23 for mounting the protrusions 322. During different stages of detection, several sensing circuits are formed, each sensing circuit corresponding to a detection range, thereby automatically locating the leakage point of the battery box.

[0029] Furthermore, the dispensing device 3 also includes several negative pressure pipes 33; Negative pressure pipes 33 are respectively provided on the side sealing plate 21, the front sealing plate 22 and the support plate 23; During border inspection: the negative pressure pipe 33 closest to the area to be inspected is opened first, and the negative pressure pipe 33 in other areas is closed; After border inspection: The negative pressure pipe 33 in the inspected area is closed, and the pressure boosting pipe 31 is opened.

[0030] For example, when inspecting the four sides of the battery box 4, during the inspection of the first side, air is first evacuated from the inspection gap through the negative pressure pipe 33 to bring it to a low-pressure state, while the other inspection gaps remain at normal pressure. When a leak occurs at this point, the water vapor inside the battery box 4 directly enters the inspection gap, improving the detection accuracy. Simultaneously, through the conductive protrusions 322, the corresponding sensing circuits in the designated areas are activated, automatically locating the leak point in the battery box 4. After this inspection is completed, the pressure boosting pipe 31 pressurizes the inspection gap. In case of a leak, pressurization prevents continuous leakage inside the battery box 4, reducing the pressure difference and affecting subsequent inspection accuracy. Each inspection gap is equipped with a pressure sensor, which outputs a pressure signal through intelligent sensing technology. When water vapor cannot leak from inside the battery box 4 to the outside, the pressure is increased to make the pressure in the inspection gap greater than the water vapor pressure inside the battery box 4, thus forming a bidirectional detection path. This prevents a single detection path from causing impurities to clog the leak point and affecting the detection accuracy.

[0031] Furthermore, the parting device 2 also includes several pressure cylinders 24. The machine body 1 is provided with several drive chambers 12. The pressure cylinders 24 are respectively placed in the drive chambers 12. The output ends of the pressure cylinders 24 are respectively connected to the adjacent side sealing plate 21, face sealing plate 22 and support plate 23.

[0032] In the initial state, the battery box 4 is first placed on the pallet. Then, the pressure cylinder 24 outputs displacement to drive the side sealing plate 21 and the face sealing plate 22 to move, thereby fully enclosing the battery box 4 for easy type identification and testing. To improve testing accuracy, sealing gaskets can be used to ensure a seal at the contact points. After testing, the pressure cylinder 24 drives the pallet 23 to lift the battery box 4, facilitating continuous testing.

[0033] Furthermore, the joint surfaces of adjacent side sealing plates 21 are arranged at an angle.

[0034] By arranging the interface of the side sealing plate 21 at an angle, it is easier to perform horizontal circumferential parting of the battery box 4.

[0035] Furthermore, the parting device 2 also includes a lifting assembly 25, which is connected to the face sealing plate 22, with the adsorption end of the lifting assembly 25 facing the battery box 4. During the inspection: Battery box 4 is placed on the tray; During bottom detection: the lifting assembly 25 moves the battery box 4 upward, creating a detection gap between the tray 23 and the battery box 4.

[0036] By setting up the lifting component 25, after the edge inspection and surface inspection are completed, the lifting component 25 on the face sealing plate 22 drives the battery box 4 to move upward, thereby forming a detection gap between the tray 23 and the battery box 4. The support part will not block the part to be inspected, thus improving the detection accuracy.

[0037] As an optimization, the lifting assembly 25 includes a lifting cylinder 251, the output end of the lifting cylinder 251 is provided with a central tube 252, the lower end of the central tube 252 is provided with a suction nozzle 253, and the suction nozzle 253 is connected to a negative pressure air source. The faceplate 22 is provided with a lifting hole 221; The lifting cylinder 251 is placed on the face sealing plate 22, and the central tube 252 and the lifting hole 221 are movably connected. The lifting cylinder 251 is installed through the face sealing plate 22 and is used for output displacement. It drives the suction nozzle 253 to move through the central tube 252. When performing edge inspection and face inspection, the part of the suction nozzle 253 connected to the negative pressure air source is cut off. When performing bottom inspection, the suction nozzle 253 is driven to move downward, and the battery box 4 is moved upward through suction. The lifting hole 221 is provided to guide the sliding of the central tube 252.

[0038] As an optimization, a bypass hole 2521 is provided on one side of the central tube 252; The faceplate 22 is provided with a negative pressure suction hole 222, which is connected to a negative pressure air source; During lifting: Bypass hole 2521 and negative pressure suction hole 222 are connected. By setting bypass hole 2521 on the central tube 252, negative pressure suction hole 222 is connected to the negative pressure air source. During edge and surface inspections, bypass hole 2521 and negative pressure suction hole 222 are misaligned, and the negative pressure flow path is cut off. During bottom inspection, as the central tube 252 moves downward, bypass hole 2521 gradually connects with negative pressure suction hole 222, thereby achieving automatic adsorption.

[0039] The working principle of this invention is as follows: The entire testing process is divided into multiple parts. For example, the battery box 4 is sealed by the side sealing plate 21, and a single-sided inspection is first performed on the horizontal circumference of the battery box 4, i.e., side inspection. After the side inspection is completed, the upper surface of the battery box 4 is sealed by the face sealing plate 22, thereby inspecting the upper surface of the battery box 4, i.e., face inspection. At this time, the battery box 4 is placed on the tray 23. After the face inspection is completed, the battery box 4 is moved upward by the parting device 2, so that the inspection gap between the tray 23 and the battery box 4 is revealed. The inspection gap can be at the millimeter level. By step-by-step inspection, the space for a single inspection is reduced. If there is a seal on the part of the battery box 4 to be inspected... If the leak fails, the proportion of instantaneous leakage in the detection gap increases compared to the overall space detection ratio, thus improving detection accuracy. If the seal of the edge line to be tested in the battery box 4 fails, moisture leaks from the battery box 4 and enters the detection gap, increasing the humidity at the leak point. This causes the circuit of the sensing component 32 to conduct, enabling automatic detection of the seal. Several substrates 321 are respectively set on the edge sealing plate 21, the face sealing plate 22, and the support plate 23 for mounting the protrusions 322. During different stages of detection, several sensing circuits are formed, each corresponding to a detection interval, thereby automatically locating the leak point in the battery box.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sealing test device for a battery box, the sealing test device being used to test a battery box (4), characterized in that: The sealing test device includes a body (1), a sorting device (2), and a mixing device (3); The body (1) is provided with a detection cavity (11); The parting device (2) includes a side sealing plate (21), a front sealing plate (22), and a tray (23), wherein the front sealing plate (22) and the tray (23) are arranged facing each other; The dispensing device (3) includes several booster tubes (31) and sensing components (32). The side sealing plate (21), the face sealing plate (22), and the tray (23) are respectively connected to the detection chamber (11). The side sealing plate (21), the face sealing plate (22), and the tray (23) are respectively provided with sensing components (32) on the side facing the battery box (4). The gap between the side sealing plate (21), the face sealing plate (22), and the tray (23) and the battery box (4) is set as the detection gap. The battery box (4) is located between the tray (23) and the face sealing plate (22). The number of side sealing plates (21) is matched with the number of sides of the battery box (4). Several of the booster pipes (31) are connected to the detection gap in sequence. The battery box (4) is filled with water vapor. The sensing component (32) includes several substrates (321) and electrode plates (323), and the substrates (321) have protrusions (322) on one side.

2. The sealing performance testing device for a battery box according to claim 1, characterized in that: The electrode (323) is connected to the battery box (4). The side sealing plate (21), the front sealing plate (22) and the support plate (23) are respectively provided with a number of substrates (321). The protrusions (322) and the electrode (323) are electrically connected to the two terminals of the power supply.

3. The sealing performance testing device for a battery box according to claim 2, characterized in that: The dispensing device (3) also includes several negative pressure pipes (33); Negative pressure pipes (33) are respectively provided on the side sealing plate (21), the face sealing plate (22) and the support plate (23); During border inspection: the negative pressure pipe (33) closest to the area to be inspected is opened first, and the negative pressure pipes (33) in other areas are closed; After border inspection: The negative pressure pipe (33) of the area where the inspection is completed is closed, and the pressure boosting pipe (31) is opened.

4. The sealing performance testing device for a battery box according to claim 3, characterized in that: The parting device (2) also includes several pressure cylinders (24). The machine body (1) is provided with several driving chambers (12). Several pressure cylinders (24) are respectively placed in the driving chambers (12). The output ends of several pressure cylinders (24) are respectively connected to the adjacent side sealing plate (21), face sealing plate (22) and support plate (23).

5. A battery box sealing test device according to claim 4, characterized in that: The interface between adjacent side sealing plates (21) is arranged at an angle.

6. A battery box sealing test device according to any one of claims 1 to 5, characterized in that: The parting device (2) further includes a lifting assembly (25), which is connected to the face sealing plate (22), and the suction end of the lifting assembly (25) faces the battery box (4). During the inspection: the battery box (4) is placed on the tray (23); During bottom detection: the lifting component (25) moves the battery box (4) upward, and a detection gap is generated between the tray (23) and the battery box (4).

7. A sealing performance testing device for a battery box according to claim 6, characterized in that: The lifting assembly (25) includes a lifting cylinder (251), the output end of which is provided with a central tube (252), and the lower end of the central tube (252) is provided with a suction nozzle (253), which is connected to a negative pressure air source; The faceplate (22) is provided with a lifting hole (221); The lifting cylinder (251) is placed on the face sealing plate (22), and the central tube (252) and the lifting hole (221) are movably connected.

8. A sealing performance testing device for a battery box according to claim 7, characterized in that: A bypass hole (2521) is provided on one side of the central tube (252); The faceplate (22) is provided with a negative pressure suction hole (222), which is connected to a negative pressure air source; When lifting: the bypass hole (2521) and the negative pressure suction hole (222) are connected.

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