Pneumatic internal expansion type battery pack upper cover air tightness detection tool

Abstract

The invention discloses a pneumatic internal expansion type battery pack upper cover air tightness detection tool which comprises a bottom plate installed in the center of a detection platform. The nylon imitation block is installed in the center of the surface of the bottom plate, a penetrating opening is formed in the middle of the nylon imitation block in a penetrating mode, and the penetrating opening is closed by a to-be-detected workpiece and the bottom plate to form a detection cavity; an air hole is formed in the bottom of the bottom plate in a penetrating mode, and an expansion chuck of the pneumatic inner support expansion clamp is arranged in the air hole; the air hole can be sealed or opened by expansion of the expansion chuck. The air hole for exhausting is formed in the bottom of the bottom plate on the detection platform, the pneumatic inner support expansion clamp is arranged below the bottom plate, and the expansion chuck of the pneumatic inner support expansion clamp is arranged in the air hole so as to contract when the to-be-detected workpiece is pressed to the nylon imitation block, and the air hole is opened to exhaust air in a gap. And after the workpiece to be detected is completely pressed on the nylon imitation block, the workpiece expands to block the air holes for air tightness detection, so that the influence of gap air on a detection value is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack production, in particular to a kind of pneumatic inner battery pack upper cover gas tightness detection tooling. BACKGROUND

[0002] With the rapid development of new energy vehicles, the demand for battery packs of new energy vehicles increases, and the production demand for battery pack upper covers also increases accordingly.The battery pack upper cover must pass the gas tightness test before assembly.If the gas tightness of the battery pack upper cover does not meet the requirements, internal oil and water may penetrate into the battery pack after assembly.

[0003] Currently, the battery pack upper cover gas tightness test usually uses nylon imitation block filling test method, which is to customize a nylon imitation block for the battery pack upper cover gas tightness test based on the shape and size of the battery pack upper cover.The nylon imitation block is installed on the detection platform to form a detection tooling.Before testing, the battery pack upper cover is installed upside down on the nylon imitation block, so that the nylon imitation block can fill the inside of the battery pack upper cover, and then the battery pack upper cover is pressed for gas tightness test.However, the design size of the nylon imitation block is usually smaller than the battery pack upper cover to be tested, so that the battery pack upper cover can be easily installed on the nylon imitation block.Therefore, there is a gap (usually 3mm) between the nylon imitation block and the battery pack upper cover to be tested for gas flow during the gas tightness test, i.e., there is air in the gap.During the test, the air cylinder of the detection tooling presses the battery pack upper cover tightly against the tooling, and in this process, the internal air enters the gas tightness tester through the air inlet hole and air pipe.The test value is determined by the volume of the battery pack upper cover cavity and the gap volume between the battery pack upper cover and the nylon imitation block.When the gas in the gap enters the gas tightness tester, it affects the final value of the gas tightness test, resulting in inaccurate measurement results and difficulty in effectively determining whether the battery pack upper cover gas tightness is qualified.

[0004] Therefore, the existing gas tightness test work has a gap between the battery pack upper cover and the nylon imitation block due to the smaller size of the nylon imitation block than the cavity size of the battery pack upper cover to be tested, so that the air in the gap is squeezed into the air inlet hole during the battery pack upper cover compression test, affecting the final value of the gas tightness test. SUMMARY

[0005] The present application aims to provide a kind of pneumatic inner battery pack upper cover gas tightness detection tooling to solve the technical problem that the size of the nylon imitation block is smaller than the cavity size of the battery pack upper cover to be tested, resulting in a gap between the battery pack upper cover and the nylon imitation block, and the air in the gap is squeezed into the air inlet hole during the battery pack upper cover compression test, affecting the final value of the gas tightness test.

[0006] To solve the above technical problems, the present application specifically provides the following technical solutions: A pneumatically operated internally expanding battery pack cover airtightness testing fixture, comprising: A base plate, which is installed in the center of the testing platform to support the workpiece to be tested; A nylon imitation block is installed in the center of the surface of the base plate. The nylon imitation block is customized according to the internal structure of the workpiece to be tested, and a through-hole is provided in the middle of the nylon imitation block so that after the workpiece to be tested and the nylon imitation block are fitted together, the through-hole is closed by the workpiece to be tested and the base plate to form a detection chamber. A pneumatic internal support expansion clamp is provided at the bottom of the base plate, and an air hole is provided through the bottom of the base plate. The expansion clamp of the pneumatic internal support expansion clamp is provided in the air hole. The vent is connected to the through port, and the vent can be expanded and closed or contracted and opened by the expansion clamp. The expansion chuck opens the vent when the workpiece to be tested is fitted with the nylon imitation block, so that the gas between the workpiece to be tested and the nylon imitation block can be discharged through the detection chamber, and the expansion chuck closes the vent after the fitting is completed.

[0007] As a preferred embodiment of the present invention, the pneumatic internal support expansion clamp includes a clamp cylinder, wherein a limiting plate is provided at the end of the cylinder rod of the clamp cylinder, and the diameter of the limiting plate is larger than the diameter of the cylinder rod of the clamp cylinder. The expansion clamp includes a baffle, one end of which is fixedly connected to a balloon, and both the baffle and the balloon are mounted on the cylinder rod of the clamp cylinder. The cylinder rod of the clamp cylinder places the baffle and the balloon into the air hole from bottom to top. The other end of the baffle is fixed to the cylinder end of the clamp cylinder, and the other end of the balloon is fixed to the limiting plate. The movement of the cylinder rod of the clamp cylinder can change the distance between the limiting plate and the baffle, so as to squeeze the balloon to expand or stretch the balloon to contract within the air hole.

[0008] In a preferred embodiment of the present invention, a positioning cylinder is provided on the clamping cylinder. The positioning cylinder can drive the clamping cylinder to move linearly along the axial direction of the air hole. The clamping cylinder extends when it is moved to the lowest position by the positioning cylinder and contracts when it is moved to the highest position. The distance between the lowest and highest positions of the clamping cylinder moved by the positioning cylinder is less than the axial length of the air hole, so that the balloon contracts after moving to the lowest position and expands after moving to the highest position.

[0009] As a preferred scheme of the present application, a fixed table is arranged at the end of the cylinder rod of the positioning cylinder, the cylinder body of the clamp cylinder is arranged on the fixed table, and the positioning cylinder and the clamp cylinder are arranged in parallel to drive the clamp cylinder to move along the axial direction of the air hole.

[0010] As a preferred scheme of the present application, a first one-way pipe and a second one-way pipe are arranged on the cylinder body of the positioning cylinder respectively, the other ends of the first one-way pipe and the second one-way pipe are connected to the cylinder body of the clamp cylinder, and the clamp cylinder and the positioning cylinder are linked through the first one-way pipe and the second one-way pipe to make the clamp cylinder contract to the shortest when the positioning cylinder extends to the highest position, and the clamp cylinder extends to the longest when the positioning cylinder contracts to the lowest position.

[0011] As a preferred scheme of the present application, the conducting direction of the first one-way pipe is that the positioning cylinder points to the clamp cylinder, and the conducting pressure of the first one-way pipe is greater than the required pressure for the cylinder rod of the positioning cylinder to extend to the maximum limit, so that the first one-way pipe is continuously conducted by air charging and pressure increasing in the cylinder body of the positioning cylinder after the cylinder rod of the positioning cylinder extends to the maximum limit; the conducting direction of the second one-way pipe is that the clamp cylinder points to the positioning cylinder, and the conducting pressure of the second one-way pipe is greater than the required pressure for the cylinder rod of the positioning cylinder to contract to the minimum limit, so that the second one-way pipe is continuously conducted by air discharging and pressure decreasing from the cylinder body of the positioning cylinder after the cylinder rod of the positioning cylinder contracts to the minimum limit.

[0012] As a preferred scheme of the present application, a pressure control nozzle is arranged on the cylinder body of the positioning cylinder, the pressure control nozzle is connected to the first one-way pipe and the second one-way pipe through the inner cavity of the cylinder body of the positioning cylinder, and the cylinder rod piston of the positioning cylinder is blocked by a limiting structure to maintain the pressure control nozzle connected to the first one-way pipe and the second one-way pipe at all times.

[0013] As a preferred scheme of the present application, a groove is arranged on the surface of the bottom plate along the outer periphery of the nylon imitation block, and a smooth silica gel foaming plate is arranged in the groove, so that the mouth of the workpiece to be tested can be tightly sealed against the surface of the smooth silica gel foaming plate after the workpiece to be tested is sleeved on the nylon imitation block.

[0014] As a preferred scheme of the present application, square tubes are vertically installed on four corners of the detection platform, upper ends of the four square tubes are jointly installed with a frame body, a plurality of downward pressing cylinders are installed on the frame body, cylinder rod ends of the four downward pressing cylinders downward penetrate the frame body, and a steel frame pressing plate is jointly installed, the plurality of downward pressing cylinders can drive the steel frame pressing plate to vertically move up and down, so that the workpiece to be detected can be downward pressed and sleeved on the nylon imitation block.

[0015] As a preferred scheme of the present application, the bottom of the steel frame pressing plate is provided with a plurality of adjustable spring screws which are vertically installed through preset hole positions, the adjustable spring screws can be rotated to adjust the vertical height thereof; Part of the adjustable spring screws are distributed along the surrounding path of the groove, and a plurality of adjacent adjustable spring screws are grouped and jointly installed with a profiled pressing block, the profiled pressing block can tightly seal the edge of the workpiece to be detected against the surface of the smooth silica gel foaming plate.

[0016] Compared with the prior art, the present application has the following beneficial effects: The bottom plate on the detection platform is provided with air holes for air exhaust, and a pneumatic inner supporting expansion clamp is arranged below the bottom plate, an expansion chuck of the pneumatic inner supporting expansion clamp is arranged in the air hole, so as to shrink when the workpiece to be detected is pressed and sleeved on the nylon imitation block, open the air hole to exhaust the air in the gap, and expand to block the air hole for air tightness detection after the workpiece to be detected is completely pressed on the nylon imitation block, thereby effectively reducing the influence of the air in the gap on the detection value. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be obtained according to the provided drawings without creative labor.

[0018] Figure 1 The structural schematic diagram of the pneumatic inner expansion type battery pack upper cover air tightness detection tool provided by the embodiment of the present application; Figure 2 The detection platform partial structural schematic diagram of the pneumatic inner expansion type battery pack upper cover air tightness detection tool provided by the embodiment of the present application; Figure 3 The nylon imitation block partial structural schematic diagram of the pneumatic inner expansion type battery pack upper cover air tightness detection tool provided by the embodiment of the present application; Figure 4 The bottom plate arrangement structural schematic diagram of the pneumatic inner expansion type battery pack upper cover air tightness detection tool provided by the embodiment of the present application; Figure 5 A schematic structural view of a clamp cylinder part of the gas-tightness detection tool for the upper cover of the pneumatic inner-rising type battery pack provided by the embodiment of the present application is shown in the figure; Figure 6 A schematic structural view of a positioning cylinder part of the gas-tightness detection tool for the upper cover of the pneumatic inner-rising type battery pack provided by the embodiment of the present application is shown in the figure.

[0019] The numbers in the figure respectively represent as follows: 1-bottom plate; 2-nylon imitation block; 3-pneumatic inner-support expansion clamp; 4-detection platform; 11-air hole; 12-groove; 13-smooth silica gel foam plate; 21-through hole; 31-expansion chuck; 32-clamp cylinder; 33-positioning cylinder; 34-first one-way pipeline; 35-second one-way pipeline; 41-square tube; 42-frame body; 43-downward pressing cylinder; 44-steel frame pressing plate; 311-stop cylinder; 312-balloon; 321-limiting disc; 331-fixing table; 332-pressure control nozzle; 441-adjustable spring screw rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] As shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 indicated, the present application provides a gas-tightness detection tool for the upper cover of the pneumatic inner-rising type battery pack, which comprises: a bottom plate 1, which is installed at the center of a detection platform 4 to support a workpiece to be detected; a nylon imitation block 2, which is installed at the center of the surface of the bottom plate 1, and is customized according to the internal structure of the workpiece to be detected, and a through hole 21 is provided at the middle part of the nylon imitation block 2, so that the through hole 21 is closed to form a detection chamber by the workpiece to be detected and the bottom plate 1 after the workpiece to be detected and the nylon imitation block 2 are assembled.

[0022] In the embodiment, the detection platform 4 is a conventional device for gas-tightness detection, which has the functions of air charging and pressure increasing and detection of pressure change, and will not be described herein. The bottom plate 1 is installed on the detection platform 4, which can provide support for the workpiece to be detected (the upper cover of the battery pack) to place the workpiece to be detected.

[0023] The nylon imitation block 2 is installed on the bottom plate 1 and used to fill the inside of the workpiece to be detected, but if the filling area is too small, the volume of the inside of the workpiece to be detected is too large, the gas inside fluctuates greatly, and the final test value is affected. Therefore, in order to increase the accuracy of the air tightness test, the nylon imitation block 2 based on the workpiece to be detected is sleeved with the workpiece to be detected, and the through hole 21 of the nylon imitation block 2 forms a small detection chamber in the workpiece to be detected, so as to improve the detection accuracy.

[0024] In addition, the tooling also includes a pneumatic inner support expansion clamp 3 arranged at the bottom of the bottom plate 1, and a gas hole 11 is arranged at the bottom of the bottom plate 1, and the expansion clamp head 31 of the pneumatic inner support expansion clamp 3 is arranged in the gas hole 11. The gas hole 11 is connected with the through hole 21, and the gas hole 11 can be expanded and closed or contracted and opened by the expansion clamp head 31. The expansion clamp head 31 opens the gas hole 11 when the workpiece to be detected is sleeved with the nylon imitation block 2, so that the gas between the workpiece to be detected and the nylon imitation block 3 can be discharged through the detection chamber, and after the sleeving is completed, the expansion clamp head 31 closes the gas hole 11.

[0025] Because the size of the nylon imitation block 2 is slightly smaller than the size of the workpiece to be detected, gas is left between the contact surfaces of the two, and this part of the gas is pressed into the air pipe and enters the air tightness testing instrument when the workpiece to be detected is installed, which affects the final value of the air tightness test. The gas hole 11 is arranged at the bottom of the bottom plate 1, and the air discharged from the gap between the contact surfaces after the workpiece to be detected and the nylon imitation block 2 are assembled is discharged through the gas hole 11. In this process, the expansion clamp head 31 of the pneumatic inner support expansion clamp 3 can contract and open the gas hole 11 to facilitate the discharge of gas, or expand and close the gas hole 11 to enable the air tightness test.

[0026] Therefore, the present application aims to open the gas hole 11 to discharge excess gas and close the gas hole 11 to meet the air tightness test requirements by arranging the gas hole 11 at the bottom of the bottom plate 1 and controlling the opening and closing of the gas hole 11 by the expansion clamp head 31 of the pneumatic inner support expansion clamp 3 after the workpiece to be detected and the nylon imitation block 2 are assembled.

[0027] Specifically, the workpiece to be detected is inverted and capped on the nylon imitation block 2, the outer wall of the workpiece to be detected is pressed vertically downward, the workpiece to be detected is sleeved on the nylon imitation block 2, and at the same time or thereafter, the expansion clamp head 31 of the pneumatic inner support expansion clamp 3 is contracted to open the gas hole 11, so that the excess gas in the gap between the workpiece to be detected and the nylon imitation block 2 is discharged from the gas hole 11, so as to avoid affecting the detection of the air tightness testing instrument. After a certain period of time, the expansion clamp head 31 of the pneumatic inner support expansion clamp 3 is expanded to close the gas hole 11, at which time the detection chamber is completely closed, and at this time the workpiece to be detected can be subjected to air tightness test.

[0028] The inflation for the air tightness detection is achieved through the air passage in communication with the detection chamber, that is, the air passage is connected to the preset air passage on the bottom plate 1 in the detection platform 4, the opening of the air passage is located in the area covered by the through port 21, so as to be connected to the detection chamber, and the other end of the air passage is connected to the air tightness detector.

[0029] The air passage is the path for the gas flow, which can be a hole in the bottom plate 1 and / or the detection platform 4, or an external pipeline, or a combination of the hole and the pipeline, which is a conventional scheme and will not be described in detail.

[0030] Based on the above embodiment, the following provides a preferred embodiment of the pneumatic inner support expansion clamp 3.

[0031] As shown in Figure 5 The pneumatic inner support expansion clamp 3 includes a clamp cylinder 32, the end of the cylinder rod of the clamp cylinder 32 is provided with a limiting disc 321, and the diameter of the limiting disc 321 is greater than the diameter of the cylinder rod of the clamp cylinder 32; The expansion chuck 31 includes a blocking cylinder 311, one end of the blocking cylinder 311 is fixedly connected with a balloon 312, and the blocking cylinder 311 and the balloon 312 are sleeved on the cylinder rod of the clamp cylinder 32, and the cylinder rod of the clamp cylinder 32 places the blocking cylinder 311 and the balloon 312 in the air hole 11 from bottom to top; The other end of the blocking cylinder 311 is fixed on the end of the cylinder body of the clamp cylinder 32, the other end of the balloon 312 is fixed on the limiting disc 321, and the cylinder rod of the clamp cylinder 32 is movable to change the distance between the limiting disc 321 and the blocking cylinder 311, so as to extrude the balloon 312 to expand or stretch the balloon 312 to contract in the air hole 11.

[0032] In this embodiment, the cylinder rod of the clamp cylinder 32 is telescopic along the axis, when the cylinder rod of the clamp cylinder 32 is elongated, since one end of the balloon 312 is fixed on the blocking cylinder 311, the limiting disc 321 stretches the balloon 312 to reduce the diameter of the balloon 312, that is, to contract the balloon 312, so as to open the air hole 11; When the cylinder rod of the clamp cylinder 32 is shortened, the limiting disc 321 compresses the balloon 312 back, so as to increase the diameter of the balloon 312, that is, to expand the balloon 312, so as to close the air hole 11.

[0033] However, due to the limitation of the filling rate of the nylon imitation block 2, the volume of the detection chamber is limited, that is, the size and number of the openings of the air hole 11 are limited, and the exhaust rate is limited, so that during the process of pressing the workpiece to be tested, the gas is difficult to be quickly exhausted, which affects the test efficiency, and part of the gas is pressed into the air pipe and enters the air tightness detector, which affects the final value of the air tightness detection. Based on this, the following preferred embodiment is provided.

[0034] As shown in Figure 6As shown, a positioning cylinder 33 is provided on the clamping cylinder 32. The positioning cylinder 33 can drive the clamping cylinder 32 to move linearly along the axial direction of the air hole 11. The clamping cylinder 32 extends when the positioning cylinder 33 moves to the lowest position and retracts when the positioning cylinder 33 moves to the highest position. The distance between the lowest and highest positions of the clamping cylinder 32 moved by the positioning cylinder 33 is less than the axial length of the air hole 11, so that the balloon 312 retracts after moving to the lowest position and expands after moving to the highest position.

[0035] In this embodiment, by adding an additional positioning cylinder 33, the positioning cylinder 33 can drive the clamping cylinder 32 to move up and down, thereby controlling the height of the balloon 312. When the balloon 312 is at the highest point inside the air hole 11, it expands and seals the air hole 11. At this time, the positioning cylinder 33 moves down and the clamping cylinder 32 will cause the balloon 312 to slide downward to seal, which reduces the pressure difference between the pressure in the detection chamber and the pressure in the gap between the nylon imitation block 2 and the workpiece to be tested, thereby allowing the gas in the gap to enter the detection chamber more quickly. Furthermore, when the balloon 312 slides down to the lowest point (the positioning cylinder 33 shortens to its shortest position), the balloon 312 contracts again to open the air hole 11, thereby allowing the gas in the detection chamber to be discharged from the air hole 11. This reduces the amount of gas forced into the air tightness tester during the process of the workpiece being pressed down for testing, thus affecting the detection value and improving the accuracy of the air tightness test.

[0036] Based on the above embodiments, the following provides the installation method of positioning cylinder 33 and clamping cylinder 32.

[0037] like Figure 6 As shown, the positioning cylinder 33 is installed on the detection platform 4. A fixed platform 331 is provided at the end of the cylinder rod of the positioning cylinder 33. The cylinder body of the clamping cylinder 32 is installed on the fixed platform 331. The positioning cylinder 33 and the clamping cylinder 32 are arranged in parallel so that the clamping cylinder 32 can be driven to move along the axial direction of the air hole 21.

[0038] In this embodiment, the positioning cylinder 33 is vertically mounted on the detection platform 4, and the clamping cylinder 32 is mounted on the fixing platform 331 on its cylinder rod, so that the clamping cylinder 32 can be vertically driven by the positioning cylinder 33.

[0039] In actual operation, both the positioning cylinder 33 and the clamping cylinder 32 require independent air sources to control their extension and retraction, thus requiring two sets of control schemes to work together to establish linkage.

[0040] Of course, in order to further reduce the difficulty of control and reduce the number of control links, and to simplify the control method, the following preferred embodiments are provided.

[0041] like Figure 6As shown, a first one-way pipe 34 and a second one-way pipe 35 are respectively provided on the cylinder body of the positioning cylinder 33. The other ends of the first one-way pipe 34 and the second one-way pipe 35 are connected to the cylinder body of the clamping cylinder 32. The clamping cylinder 32 and the positioning cylinder 33 are linked through the first one-way pipe 34 and the second one-way pipe 35 so that when the positioning cylinder 33 extends to the highest position, the clamping cylinder 32 retracts to the shortest position, and when the positioning cylinder 33 retracts to the lowest position, the clamping cylinder 32 extends to the longest position.

[0042] In this embodiment, the positioning cylinder 33 is controlled by an external air circuit. It is first inflated or deflated internally to drive the positioning cylinder 33 to extend and retract. The first one-way pipe 34 and the second one-way pipe 35 can be connected to the clamping cylinder 32. When the positioning cylinder 33 is extended to its longest length, it is inflated and pressurized into the upper chamber of the clamping cylinder 32 through the first one-way pipe 34 to move the balloon 312 downward. Or when the positioning cylinder 33 is shortened to its shortest length, it is deflated and depressurized from the upper chamber of the clamping cylinder 32 through the second one-way pipe 35 to move the balloon 312 upward.

[0043] To implement the conduction logic of the first unidirectional conduit 34 and the second unidirectional conduit 35, the following preferred embodiments are provided.

[0044] like Figure 6 As shown, the conduction direction of the first one-way pipe 34 is from the positioning cylinder 33 to the clamping cylinder 32, and the conduction pressure of the first one-way pipe 34 is greater than the pressure required for the cylinder rod of the positioning cylinder 33 to extend, so that after the cylinder rod of the positioning cylinder 33 extends to the maximum limit, the cylinder body of the positioning cylinder 33 continues to be filled with air and pressurized to conduct the first one-way pipe 34. The second one-way pipe 35 is directed from the clamping cylinder 32 to the positioning cylinder 33, and the pressure of the second one-way pipe 35 is greater than the pressure required for the cylinder rod of the positioning cylinder 33 to retract, so that after the cylinder rod of the positioning cylinder 33 retracts to the minimum limit, air is continuously drawn from the cylinder body of the positioning cylinder 33 to reduce pressure and connect the second one-way pipe 35.

[0045] In this embodiment, the opening conditions of the one-way valves in the first one-way pipeline 34 and the second one-way pipeline 35 are preset. That is, the first one-way pipeline 34 and the second one-way pipeline 35 can only be connected when the pressure difference is greater than the set threshold. In other words, the first one-way pipeline 34 and the second one-way pipeline 35 can only be connected when the positioning cylinder 33 is extended to the limit. Thus, the height positioning of the clamping cylinder 32 is achieved first, and then the opening and closing of the air hole 11 of the balloon 312 is performed.

[0046] Since the positioning cylinder 33 only needs to be positioned at the highest point and the lowest point, that is, the longest and shortest extension of the cylinder rod, there is no requirement for the accuracy of the cylinder rod of the positioning cylinder 33 in the extension range, and the positioning cylinder 33 adopts one-way gas circuit to complete the control, which is simpler. Based on this, the following preferred embodiments are provided.

[0047] As shown in Figure 6 , a pressure control nozzle 332 is arranged on the cylinder body of the positioning cylinder 33, the pressure control nozzle 331 is connected with the first one-way pipeline 34 and the second one-way pipeline 35 through the inner cavity of the cylinder body of the positioning cylinder 33, and the cylinder rod piston of the positioning cylinder 33 is blocked by a limiting structure to maintain the pressure control nozzle 331 always connected with the first one-way pipeline 34 and the second one-way pipeline 35.

[0048] In this embodiment, the pressure control nozzle 332 is used to connect an external air pressure pipeline to control the pressure of the lower chamber in the positioning cylinder 33, that is, when the air is filled inward, the cylinder rod of the positioning cylinder 33 is elongated upward, and when the air is extracted outward, the cylinder rod of the positioning cylinder 33 is shortened downward. And in order to avoid the influence of the piston of the cylinder rod on the communication of the pressure control nozzle 332, the first one-way pipeline 34 and the second one-way pipeline 35, a limiting structure is arranged in the inner cavity of the cylinder body of the positioning cylinder 33 to limit the piston to descend to the lowest position of the inner cavity of the cylinder body, so that the pressure control nozzle 332, the first one-way pipeline 34 and the second one-way pipeline 35 connected through this area are always connected.

[0049] Of course, during the detection of air tightness, it is also necessary to ensure the sealing performance of the tool to the measured workpiece. Based on this, the following preferred embodiments are provided.

[0050] As shown in Figure 1 , Figure 2 , Figure 3 , the surface of the bottom plate 1 is provided with a groove 12 along the outer periphery of the nylon imitation block 2, and a smooth silica gel foaming plate 13 is arranged in the groove 12, so that after the measured workpiece is sleeved on the nylon imitation block 2, the edge of the measured workpiece can be tightly sealed on the surface of the smooth silica gel foaming plate 13.

[0051] In this embodiment, by arranging the groove 12 on the surface of the bottom plate 1 and installing the smooth silica gel foaming plate 13 in the groove 12, the edge of the measured workpiece can be tightly sealed on the smooth silica gel foaming plate 13 after the measured workpiece is sleeved on the nylon imitation block 2.

[0052] The smooth silica gel foam plate 13 is a relatively soft material. When detecting the air tightness, the smooth silica gel foam plate 13 is pressed downwards to extrude the workpiece to be detected, and the smooth silica gel foam plate 13 deforms, that is, the workpiece to be detected is sealed and moves downwards to reduce the volume of the detection cavity, that is, the pressure increases and the gas in the detection cavity is discharged into the air tightness detector through the gas path to obtain the detection value.

[0053] Since the workpiece to be detected is reversely buckled on the nylon imitation block 2 and in contact with the smooth silica gel foam plate 13, the volume of the detection cavity is relatively fixed. When detecting, the set distance is pressed downwards, the volume of the detection cavity changes relatively fixedly, the detection value of the air tightness detector is relatively fixed, and based on this, the standard value and the early warning threshold value of the air tightness detection can be set. However, the gas between the workpiece to be detected and the nylon imitation block 2 is easily discharged into the air tightness detector, resulting in a detection value higher than the standard value, so that the final value deviates from the actual situation during the detection time, and a false detection occurs. Therefore, it is necessary to use the air hole 11 to discharge the gas between the workpiece to be detected and the nylon imitation block 2.

[0054] During the detection process, the detection platform 4 is used to press the workpiece to be detected and provide a mounting position and power supply for the air tightness detector. When the detection platform 4 presses the workpiece to be detected, the workpiece to be detected needs to be pressed downwards uniformly to avoid uneven force on the workpiece to be detected and to generate large friction with the nylon imitation block to affect the air tightness. Based on this, the following preferred embodiments are provided.

[0055] As shown in Figure 1 , Figure 2 , four square tubes 41 are vertically installed on the four corners of the detection platform 4, the upper ends of the four square tubes 41 are jointly installed with a frame body 42, a plurality of downward pressing cylinders 43 are installed on the frame body 42, the rod ends of the four downward pressing cylinders 43 penetrate downward through the frame body 42, and a steel frame pressing plate 44 is jointly installed, the plurality of downward pressing cylinders 43 can drive the steel frame pressing plate 44 to move vertically up and down, so as to press the workpiece to be detected downwards and buckle it on the nylon imitation block 2.

[0056] In this embodiment, the detection platform 4 forms a frame type bearing structure through the square tubes 41 and the frame body 42, and a plurality of downward pressing cylinders 43 are installed thereon. The plurality of downward pressing cylinders 43 are uniformly distributed and jointly install the steel frame pressing plate 44, so that the steel frame pressing plate 44 can press the workpiece to be detected uniformly, improving the stability and uniformity of the pressing.

[0057] In addition, since the steel frame pressing plate 44 is a rigid structure, it can only press the surface of the middle region of the workpiece to be detected when pressing the workpiece to be detected uniformly, and the surface of the edge of the cover opening of the battery pack upper cover is not stressed, which is easy to cause poor sealing. Based on this, the following preferred embodiments are provided.

[0058] As shown in Figure 1 , Figure 2 , Figure 3、 Figure 4 As shown, the bottom of the steel frame pressing plate 44 is provided with a plurality of adjustable spring screws 441 vertically installed through preset hole positions, which can be rotated to adjust the vertical height thereof; The adjustable spring screws 441 are distributed along the circumferential path of the groove 12, and a plurality of adjacent adjustable spring screws 411 are grouped and jointly installed with a profiling pressing block 442, which can tightly seal the edge of the workpiece to be measured against the surface of the smooth silica gel foaming plate 13.

[0059] In the embodiment, by arranging the adjustable spring screws 441 on the bottom of the steel frame pressing plate 44, the longitudinal position of the adjustable spring screws 441 can be adjusted according to the shape of the outer surface of the workpiece to be measured, so that the workpiece to be measured can be uniformly pressed at multiple points. The adjustable spring screws 441 distributed along the edge of the groove 12 can directly contact the edge of the workpiece to be measured to more stably seal the workpiece to be measured on the smooth silica gel foaming plate 13.

[0060] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be considered to fall within the protection scope of the present application.

Claims

1. A kind of aerodynamic inner battery pack upper cover tightness detection frock, it is characterized in that, The utility model relates to a kind of battery pack upper cover air-tightness detection tool, including: Bottom plate (1), the bottom plate (1) is installed in the center of detection platform (4), to support the workpiece to be measured; Nylon imitation block (2), install the surface center of the bottom plate (1), the nylon imitation block (2) is customized according to the internal structure of the workpiece to be measured, and the middle part of the nylon imitation block (2) is provided with through hole (21), so that the through hole (21) is closed to form detection chamber by the workpiece to be measured and the bottom plate (1) after the workpiece to be measured and the nylon imitation block (2) are fitted; Pneumatic inner support expansion clamp (3) is provided at the bottom of the bottom plate (1), and expansion chuck (31) of the pneumatic inner support expansion clamp (3) is provided in the gas hole (11) at the bottom of the bottom plate (1); The gas hole (11) is connected with the through hole (21), and the gas hole (11) can be expanded closed or contracted opened by the expansion chuck (31); The expansion chuck (31) opens the gas hole (11) when the workpiece to be measured and the nylon imitation block (2) are fitted, so that the gas between the workpiece to be measured and the nylon imitation block (3) can be discharged through the detection chamber, and the expansion chuck (31) closes the gas hole (11) after fitting is completed.

2. The battery pack upper cover air-tightness detection tool according to claim 1, wherein: The pneumatic inner support expansion clamp (3) includes a clamp cylinder (32), and a limiting disc (321) is arranged at the end of the cylinder rod of the clamp cylinder (32), and the diameter of the limiting disc (321) is greater than the diameter of the cylinder rod of the clamp cylinder (32); The expansion chuck (31) includes a blocking barrel (311), one end of the blocking barrel (311) is fixedly connected with a balloon (312), and the blocking barrel (311) and the balloon (312) are fitted on the cylinder rod of the clamp cylinder (32), and the cylinder rod of the clamp cylinder (32) places the blocking barrel (311) and the balloon (312) in the gas hole (11) from bottom to top; Wherein, the other end of the blocking barrel (311) is fixed on the end of the cylinder body of the clamp cylinder (32), the other end of the balloon (312) is fixed on the limiting disc (321), and the cylinder rod of the clamp cylinder (32) can change the distance between the limiting disc (321) and the blocking barrel (311) to extrude the balloon (312) to expand or stretch the balloon (312) to contract in the gas hole (11).

3. The battery pack upper cover air-tightness detection tool according to claim 2, wherein: A positioning cylinder (33) is arranged on the clamp cylinder (32), which can drive the clamp cylinder (32) to move linearly along the axial direction of the air hole (11), the clamp cylinder (32) is elongated when moved to the lowest position by the positioning cylinder (33), and is contracted when moved to the highest position by the positioning cylinder (33), and the distance between the lowest position and the highest position of the clamp cylinder (32) moved by the positioning cylinder (33) is less than the axial length of the air hole (11), so that the balloon (312) is contracted after moving to the lowest position and is inflated after moving to the highest position.

4. The gas-tightness detection tool for the inner-rising type battery pack upper cover according to claim 3, characterized in that, The positioning cylinder (33) is installed on the detection platform (4), a fixed table (331) is arranged at the rod end of the positioning cylinder (33), the cylinder body of the clamp cylinder (32) is installed on the fixed table (331), and the positioning cylinder (33) and the clamp cylinder (32) are arranged in parallel to drive the clamp cylinder (32) to move along the axial direction of the air hole (21).

5. The gas-tightness detection tool for the inner-rising type battery pack upper cover according to claim 4, characterized in that, First and second one-way pipes (34) and (35) are respectively arranged on the cylinder body of the positioning cylinder (33), one ends of the first and second one-way pipes (34) and (35) are connected to the cylinder body of the clamp cylinder (32), and the clamp cylinder (32) and the positioning cylinder (33) are linked through the first and second one-way pipes (34) and (35) to contract the clamp cylinder (32) to the shortest when the positioning cylinder (33) is elongated to the highest position, and elongate the clamp cylinder (32) to the longest when the positioning cylinder (33) is contracted to the lowest position.

6. The gas-tightness detection tool for the inner-rising type battery pack upper cover according to claim 5, characterized in that, The first one-way pipe (34) is directed to the clamp cylinder (32) from the positioning cylinder (33), and the pressure of the first one-way pipe (34) is greater than the pressure required for the rod of the positioning cylinder (33) to be elongated to the maximum limit, so that the first one-way pipe (34) is continuously conducted to the cylinder body of the positioning cylinder (33) after the rod of the positioning cylinder (33) is elongated to the maximum limit; The second one-way pipe (35) is directed to the positioning cylinder (33) from the clamp cylinder (32), and the pressure of the second one-way pipe (35) is greater than the pressure required for the rod of the positioning cylinder (33) to be contracted to the minimum limit, so that the second one-way pipe (35) is continuously conducted to the cylinder body of the positioning cylinder (33) after the rod of the positioning cylinder (33) is contracted to the minimum limit.

7. The gas-tightness detection tool for the inner-rising type battery pack upper cover according to claim 6, characterized in that, The pressure control nozzle (332) is arranged on the cylinder body of the positioning cylinder (33), the pressure control nozzle (332) is communicated with the first one-way pipeline (34) and the second one-way pipeline (35) through the inner cavity of the cylinder body of the positioning cylinder (33), and the cylinder rod piston of the positioning cylinder (33) is blocked by a limiting structure to maintain the pressure control nozzle (332) always communicated with the first one-way pipeline (34) and the second one-way pipeline (35).

8. The gas-tightness detection tool for the inner-rising type battery pack upper cover according to claim 1, characterized in that, The surface of the bottom plate (1) is provided with a groove (12) along the outer periphery of the nylon imitation block (2), and a smooth silica gel foaming plate (13) is arranged in the groove (12), so that the mouth of the workpiece to be tested can be tightly sealed against the surface of the smooth silica gel foaming plate (13) after the workpiece to be tested is sleeved on the nylon imitation block (2).

9. The gas-tightness detection tool for the inner-rising type battery pack upper cover according to claim 8, characterized in that, Four square tubes (41) are vertically installed on the four corners of the detection platform (4), the upper ends of the four square tubes (41) are jointly provided with a frame body (42), a plurality of downward pressing cylinders (43) are installed on the frame body (42), the rod ends of the four downward pressing cylinders (43) downward penetrate the frame body (42), and a steel frame pressing plate (44) is jointly installed, the plurality of downward pressing cylinders (43) can drive the steel frame pressing plate (44) to vertically move up and down, so that the workpiece to be tested can be sleeved on the nylon imitation block (2).

10. The gas-tightness detection tool for the inner-rising type battery pack upper cover according to claim 9, characterized in that, The bottom of the steel frame pressing plate (44) is provided with a plurality of adjustable spring screws (441) vertically installed through preset holes, and the adjustable spring screws (441) can be rotated to adjust the vertical height; Part of the adjustable spring screws (441) are distributed along the surrounding path of the groove (12), and a plurality of adjacent adjustable spring screws (411) are grouped and jointly provided with a profiling pressing block (442), and the profiling pressing block (442) can tightly seal the edge of the workpiece to be tested against the surface of the smooth silica gel foaming plate (13).

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