A new energy flame-retardant battery cover detection device

Abstract

The patent application belongs to the technical field of battery cover detection, and particularly relates to a device comprising a water tank, a battery cover to be detected can be installed on the inner bottom wall of the water tank, the battery cover and the inner bottom wall of the water tank form a detection cavity, and the device further comprises a lifting mechanism, an inflation pipe, a liquid injection pipe and a floating valve core; during air tightness detection, the inflation pipe can pass into gas to the detection cavity through the gas inlet and the gas outlet, the blocking plate blocks the second through hole, and the connecting column blocks the second exhaust port; during water pressure detection, the water pressure in the liquid injection pipe makes the liquid injection pipe and the floating valve core rise, the blocking plate is separated from the second through hole, the first exhaust port is communicated with the second exhaust port, as the liquid level in the detection cavity rises, the floating valve core is raised again by the float, the first exhaust port and the second exhaust port are misaligned, and the connecting column abuts against the limiting plate; the purpose is to sequentially complete the air tightness and water pressure resistance detection, the workpiece does not need to be transferred between different devices, the test efficiency is improved, and the detection structure reliability is ensured.

Description

Technical Field

[0001] This invention relates to the field of battery cover testing technology, and specifically to a testing device for flame-retardant battery covers for new energy vehicles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the safety and reliability of power battery packs have become a core focus of the industry. The battery cover (or battery box cover), as a key protective component of the battery pack, directly affects the battery system's waterproof, dustproof, and pressure-resistant capabilities through its sealing performance and structural strength. Therefore, during the battery cover manufacturing process, airtightness tests and water pressure resistance tests are typically conducted to verify whether it meets design requirements.

[0003] Existing patent (CN208795440U) discloses a battery box cover airtightness testing device. This device uses a hydraulic cylinder to drive a pressure frame to press the battery box cover tightly, and utilizes a pneumatic unit (including a PLC controller, pressure regulating valve, solenoid valve, throttle valve, pressure transmitter, etc.) to inflate the inside of the battery box cover. The sealing performance is determined by measuring the amount of gas leakage. This device achieves automatic airtightness testing, improving testing efficiency and accuracy to a certain extent.

[0004] However, the aforementioned devices and most existing testing equipment can only perform airtightness tests individually and cannot complete water pressure resistance tests on the same equipment. In actual production, battery covers often need to undergo airtightness and water pressure tests at different workstations or on different equipment. This not only increases the number of workpiece clamping times and testing cycles, but also may introduce errors due to repeated positioning, affecting the reliability of the test results. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a new energy flame-retardant battery cover testing device with high testing efficiency, good reliability, and the ability to perform air tightness testing and water pressure resistance testing on the same device.

[0006] The technical solution adopted in this invention is as follows: A new energy flame-retardant battery cover testing device includes a water tank, the battery cover to be tested can be installed on the bottom wall of the water tank, the battery cover and the bottom wall of the water tank form a testing chamber, and also includes a lifting mechanism, an air inlet pipe, a liquid injection pipe and a floating valve core. The top of the battery cover is provided with a first through hole vertically. The lifting mechanism can drive the air tube to rise and fall and communicate with the first through hole. The bottom of the water tank is provided with a second through hole coaxial with the first through hole. The liquid injection tube is slidably installed in the second through hole. The floating valve core includes a rod body, and the rod body is provided with a sealing plate, a float, and a connecting column from bottom to top; The sealing plate is fixedly connected to the injection pipe and can block the second through hole. The injection pipe has an outlet on its side. The connecting column has an air outlet in the vertical direction and a first exhaust port in the side direction that communicates with the air outlet. The inflation pipe has a limiting plate inside, and an air inlet that is offset from the air outlet on the limiting plate. The inflation pipe has a second exhaust port on its side wall. During airtightness testing, gas can be introduced into the testing chamber through the air inlet and outlet of the inflation tube. The sealing plate blocks the second through hole, and the connecting column blocks the second exhaust port. During water pressure testing, the water pressure in the injection tube causes the injection tube and the floating valve core to rise. The sealing plate disengages from the second through hole, and the first exhaust port connects with the second exhaust port. As the liquid level in the testing chamber rises, the float causes the floating valve core to rise again, and the first exhaust port and the second exhaust port are misaligned. The top of the connecting column rests against the limiting plate.

[0007] Working principle: During testing, the lifting mechanism raises the inflation tube, detaching it from the floating valve core. The battery cover to be tested can then be placed on the bottom wall of the water tank. Bolts are used for installation and sealing, forming a testing chamber. The lifting mechanism then lowers the inflation tube, with its bottom entering and connecting to the first through hole. An airtightness test is performed first. An air pump supplies air through the inflation tube. At this time, there is a certain distance between the limiting plate and the connecting column. The gas first enters through the air inlet of the limiting plate and then through the air outlet of the connecting column into the testing chamber. After inflation, a pressure sensor is installed in the testing chamber to detect whether the seal meets the requirements. After the airtightness test is completed, the process begins... During the water pressure test, the water pump fills the tank with liquid through the injection pipe. The outlet is first blocked by the side wall of the second through hole. The water pressure in the injection pipe gradually increases until the injection pipe is lifted up and the outlet is higher than the bottom wall of the tank. The first vent and the second vent are connected. At this time, liquid is injected into the test chamber. Gas is discharged to the outside through the vent, the first vent, and the second vent. As the liquid level in the test chamber gradually rises, it will contact the float. Due to buoyancy, the floating valve core rises until the float blocks the bottom of the air filling pipe. The top of the connecting column is blocked by the limiting plate. The first vent and the second vent are misaligned and no more gas is discharged. The water pump continues to pressurize until the water pressure resistance test is completed.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. With the above settings, the air tightness and water pressure resistance tests can be completed sequentially without transferring the workpiece between different devices, which improves testing efficiency and ensures the reliability of the test structure.

[0009] 2. Utilizing water pressure and buoyancy as power, the device automatically switches between test modes and opens and closes the exhaust port without the need for external electrical control valves or sensors. This avoids the risk of failure of the electrical control logic in humid and high water pressure environments, enhances the durability and reliability of the device, and has a lower equipment cost.

[0010] In a preferred embodiment of the present invention, the outer diameter of the float is smaller than the inner diameter of the first through hole, but larger than the inner diameter of the inflation tube.

[0011] Beneficial effects: The above settings achieve the function of safe pressure relief. The top of the float can block the bottom opening of the air tube. After the water pressure resistance test, the lifting mechanism drives the air tube to rise. The float cannot block the first through hole in the vertical top of the battery cover. Therefore, the internal liquid is sprayed out, which relieves pressure in advance and avoids the internal liquid spraying out when the battery cover is manually removed, thus reducing the risk.

[0012] In a preferred embodiment of the present invention, the bottom wall of the water tank is provided with a third through hole outside the detection chamber, and the third through hole is used for drainage.

[0013] Beneficial effect: By setting a third through hole, the liquid in the water tank can be automatically discharged through the third through hole after the battery cover is removed.

[0014] In a preferred embodiment of the present invention, an installation ring is provided on the inflation tube, and a sealing ring is installed at the bottom of the installation ring. When the inflation tube is connected to the first through hole, the installation ring presses the sealing ring tightly onto the battery cover.

[0015] Beneficial effect: By using the above settings, the sealing ring is used to seal the gap in the first through hole, thereby improving the sealing performance of the detection chamber.

[0016] In a preferred embodiment of the present invention, the inflation tube is connected to the air pump via a corresponding hose, and the liquid injection tube is connected to the water pump via a corresponding hose.

[0017] Beneficial effect: With the above setting, since the inflation tube and the liquid injection tube need to be moved, the flexible tube facilitates their vertical movement.

[0018] In a preferred embodiment of the present invention, the lifting mechanism adopts an electric push rod, the outer wall of the inflation tube is fixedly connected to a lifting frame, and the moving end of the electric push rod is fixedly connected to the lifting frame.

[0019] Beneficial effects: The above settings provide smooth and controllable linear motion, enabling automated testing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the new energy flame-retardant battery cover testing device of the present invention, which is equipped with a battery cover; Figure 2 This is a schematic diagram of the structure of an embodiment of the new energy flame-retardant battery cover testing device of the present invention; Figure 3 This is a three-dimensional sectional view of an embodiment of the new energy flame-retardant battery cover testing device of the present invention, with the battery cover installed. Figure 4 yes Figure 3Enlarged view of the structure at point A in its inflated state; Figure 5 yes Figure 3 A magnified view of the structure at point A during the injection process; Figure 6 yes Figure 3 An enlarged view of the structure after the liquid injection at point A is completed.

[0021] The attached reference numerals include: water tank 1, second through hole 11, third through hole 12, lifting mechanism 2, air inlet pipe 3, lifting frame 31, limiting plate 32, air inlet 321, second exhaust port 33, sealing ring 34, mounting ring 35, liquid injection pipe 4, liquid outlet 41, floating valve core 5, sealing plate 51, float 52, connecting column 53, air outlet 531, first exhaust port 532, rod 54, battery cover 6, and first through hole 61. Detailed Implementation

[0022] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0023] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] See Figure 1 As shown in the figure, this embodiment discloses a new energy flame-retardant battery cover testing device, including a water tank 1, a lifting mechanism 2, an air filling pipe 3, a liquid injection pipe 4, and a floating valve core 5.

[0025] See Figure 2 As shown, the water tank 1 is a box structure with an open top and a flat inner bottom wall; the battery cover 6 to be tested is detachably mounted on the inner bottom wall of the water tank 1 by bolts. A sealed testing chamber is formed between the battery cover 6 and the inner bottom wall of the water tank 1. The top of the battery cover 6 has a first through hole 61 vertically opened to connect the testing chamber to the outside.

[0026] See Figure 3 As shown, a second through hole 11, coaxial with the first through hole 61, is provided on the inner bottom wall of the water tank 1. The injection pipe 4 is slidably installed in the second through hole 11. An outlet 41 is provided on the upper side of the injection pipe 4, and the lower end of the injection pipe 4 is connected to the water pump through a hose.

[0027] See Figure 4As shown, the lifting mechanism 2 is installed on one side of the water tank 1. In this embodiment, the lifting mechanism 2 is an electric push rod. A lifting frame 31 is fixedly connected to the outer wall of the inflation pipe 3. The moving end of the electric push rod is fixedly connected to the lifting frame 31, thereby driving the inflation pipe 3 to move up and down. The lower end of the inflation pipe 3 can extend into the first through hole 61 of the battery cover 6 and communicate with the first through hole 61. The upper end of the inflation pipe 3 is connected to the air pump through a hose. A limiting plate 32 is provided inside the inflation pipe 3. The limiting plate 32 has multiple air inlets 321, which are connected to the air inlet channel of the inflation pipe 3. A second exhaust port 33 is also provided on the side wall of the inflation pipe 3.

[0028] The inflation tube 3 is provided with an installation ring 35, and a sealing ring 34 is installed at the bottom of the installation ring 35. When the inflation tube 3 is connected to the first through hole 61, the installation ring 35 presses the sealing ring 34 onto the battery cover 6. (In this device, the same sealing measures can be used in other locations where gaps may exist. This is a mature existing technology and will not be described in detail here.)

[0029] The floating valve core 5 includes a rod 54, from bottom to top, coaxially fixed with a sealing plate 51, a float 52, and a connecting column 53. The sealing plate 51 is fixedly connected to the upper end of the injection pipe 4, and its outer diameter is larger than the inner diameter of the second through hole 11, used to seal the second through hole 11. The float 52 is a cylindrical float with an outer diameter smaller than the inner diameter of the first through hole 61, but larger than the inner diameter of the air inlet pipe 3. The connecting column 53 has multiple vertically openings 531, which pass through both the upper and lower ends of the connecting column 53. Multiple air inlets 321 are staggered with each air outlet 531. The connecting column 53 also has a first exhaust port 532 on its side, which is connected to the corresponding air outlet 531.

[0030] See Figure 4 As shown, in the initial state, the injection tube 4 is positioned low under gravity, and the sealing plate 51 blocks the second through hole 11, with the outlet 41 blocked by the side wall of the second through hole 11. The inflation tube 3 descends under the drive of the lifting mechanism 2, its lower end inserting into the first through hole 61. At this time, the limiting plate 32 inside the inflation tube 3 is positioned above the connecting column 53, with a gap between them. The upper end of the connecting column 53 does not contact the limiting plate 32, and the position of the first exhaust port 532 is lower than the second exhaust port 33 on the side wall of the inflation tube 3; the two are misaligned, meaning the first exhaust port 532 is blocked by the inner wall of the inflation tube 3, and the second exhaust port 33 is also blocked by the outer wall of the connecting column 53.

[0031] During the airtightness test, the air pump is started, and compressed air enters the inflation tube 3 through the hose. It first passes through the air inlet 321 on the limiting plate 32, and then enters the internal space of the inflation tube 3. Since the air outlet 531 of the connecting column 53 is connected to the inside of the inflation tube 3, the gas continues downward through the air outlet 531 into the test chamber. At this time, the sealing plate 51 blocks the second through hole 11, ensuring the water path is closed; the first exhaust port 532 and the second exhaust port 33 are misaligned, closing the exhaust channel. The test chamber becomes a sealed space, and gas continuously fills in, increasing the pressure. A pressure sensor installed in the test chamber monitors the pressure value in real time. The pressure drop value after pressure holding determines whether the airtightness of the battery cover 6 is qualified.

[0032] During the water pressure withstand test, after the airtightness test is passed, there is no need to remove the battery cover 6; the water pressure withstand test can be carried out directly. Start the water pump, and water enters the injection pipe 4 through the corresponding hose. Initially, the outlet 41 is blocked by the side wall of the second through hole 11, preventing water from flowing out, and the water pressure inside the injection pipe 4 gradually increases. When the upward thrust generated by the water pressure on the injection pipe 4 exceeds the total weight of the injection pipe 4, the floating valve core 5, and the internal water, the injection pipe 4, together with the floating valve core 5, slides upward.

[0033] See Figure 5 As shown, after the injection tube 4 rises, the outlet 41 first detaches from the side wall of the second through hole 11, exposing itself above the bottom wall of the water tank 1. Water begins to flow out from the outlet 41 and enter the detection chamber. Simultaneously, the sealing plate 51 leaves the second through hole 11, releasing the blockage. The first exhaust port 532 on the connecting column 53 moves upward to connect with the second exhaust port 33 on the side wall of the inflation tube 3. At this time, the air in the detection chamber is discharged to the outside atmosphere sequentially through the exhaust port 531, the first exhaust port 532, and the second exhaust port 33, achieving automatic venting.

[0034] See Figure 6 As shown, with the continuous injection of water by the pump, the liquid level in the detection chamber gradually rises. When the liquid level contacts the float 52, the float 52, under the action of buoyancy, drives the entire floating valve core 5 to continue moving upward. After the floating valve core 5 rises further, the upper end face of the float 52 abuts against the lower end face of the air inlet pipe 3, sealing the lower opening of the air inlet pipe 3. At the same time, the upper end of the connecting column 53 abuts against the lower surface of the limiting plate 32, and the first exhaust port 532 and the second exhaust port 33 are misaligned again, and the exhaust channel is closed. The water pump continues to pressurize, the pressure rises to the set value and is maintained, the pressure is monitored and the pressure resistance of the battery cover 6 is judged to be qualified (observe whether the outer shell is cracked or permanently deformed).

[0035] After the water pressure test is completed, the water pump is turned off, and the lifting mechanism 2 drives the inflation pipe 3 to rise, causing its lower end to exit the first through hole 61. Since the outer diameter of the float 52 is smaller than the inner diameter of the first through hole 61, after the inflation pipe 3 rises, the float 52 cannot seal the first through hole 61. The residual pressure inside the detection chamber will push water upwards from the first through hole 61, achieving automatic pressure relief. The operator can then safely remove the battery cover 6.

[0036] In addition, such as Figure 1 As shown, a third through hole 12 is also provided on the inner bottom wall of the water tank 1 outside the detection chamber. This third through hole 12 is used to drain the water in the water tank 1 after the test is completed. The third through hole 12 can be connected to a drain valve or a water recovery tank through a pipeline.

[0037] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A new energy flame-retardant battery cover testing device, comprising a water tank (1), wherein the battery cover (6) to be tested can be installed on the inner bottom wall of the water tank (1), and the battery cover (6) and the inner bottom wall of the water tank (1) form a testing cavity, characterized in that: It also includes a lifting mechanism (2), an air inlet pipe (3), an injection pipe (4), and a floating valve core (5); The top of the battery cover (6) is provided with a first through hole (61) vertically. The lifting mechanism (2) can drive the air tube (3) to rise and fall and communicate with the first through hole (61). The bottom of the water tank (1) is provided with a second through hole (11) coaxial with the first through hole (61). The liquid injection tube (4) is slidably installed in the second through hole (11). The floating valve core (5) includes a rod (54), and the rod (54) is provided with a sealing plate (51), a float (52), and a connecting column (53) from bottom to top. The sealing plate (51) is fixedly connected to the injection pipe (4) and can block the second through hole (11). The injection pipe (4) has an outlet (41) on its side. The connecting column (53) has an air outlet (531) vertically and a first exhaust port (532) connected to the air outlet (531) on its side. The inflation pipe (3) has a limiting plate (32) inside. The limiting plate (32) has an air inlet (321) that is misaligned with the air outlet (531). The side wall of the inflation pipe (3) has a second exhaust port (33). The outer diameter of the float (52) is smaller than the inner diameter of the first through hole (61) and larger than the inner diameter of the air inlet pipe (3); During the airtightness test, the inflation tube (3) can introduce gas into the test chamber through the air inlet (321) and the air outlet (531). The sealing plate (51) blocks the second through hole (11), and the connecting column (53) blocks the second exhaust port (33). During the water pressure test, the water pressure in the injection tube (4) causes the injection tube (4) and the floating valve core (5) to rise. The sealing plate (51) disengages from the second through hole (11), and the first exhaust port (532) connects with the second exhaust port (33). As the liquid level in the test chamber rises, the float (52) causes the floating valve core (5) to rise again. The first exhaust port (532) and the second exhaust port (33) are misaligned. The connecting column (53) rests against the limiting plate (32), and the upper end face of the float (52) rests against the lower end face of the inflation tube (3), blocking the lower end opening of the inflation tube (3).

2. The new energy flame-retardant battery cover testing device according to claim 1, characterized in that: The bottom wall of the water tank (1) is provided with a third through hole (12) on the outside of the detection chamber, and the third through hole (12) is used for drainage.

3. The new energy flame-retardant battery cover testing device according to claim 1, characterized in that: An installation ring (35) is provided on the inflation tube (3), and a sealing ring (34) is installed at the bottom of the installation ring (35). When the inflation tube (3) is connected to the first through hole (61), the installation ring (35) presses the sealing ring (34) onto the battery cover (6).

4. The new energy flame-retardant battery cover testing device according to claim 1, characterized in that: The inflation tube (3) is connected to the air pump through a corresponding hose, and the liquid injection tube (4) is connected to the water pump through a corresponding hose.

5. The new energy flame-retardant battery cover testing device according to claim 1, characterized in that: The lifting mechanism (2) uses an electric push rod, and the outer wall of the air pipe (3) is fixedly connected to a lifting frame (31). The moving end of the electric push rod is fixedly connected to the lifting frame (31).

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