Air permeability tester

Abstract

The utility model discloses an air permeability tester, and relates to the technical field of testing devices, and the air permeability tester comprises two clamping driving mechanisms connected to a case through a rack; the two clamping air tap assemblies are connected to the corresponding clamping driving mechanisms; the at least one supporting air tap assembly is correspondingly arranged below the clamping air tap assembly, and an experiment piece is clamped between the clamping air tap assembly and the supporting air tap assembly; the clamping driving mechanism drives the clamping gas nozzle assembly to move, so that a first gas cylinder of the clamping gas nozzle assembly ventilates gas to a second gas cylinder of the supporting gas nozzle assembly, gas passes through the experiment piece, and the gas permeability of the experiment piece is measured, and the device is simple in structure, easy to install, rapid in test result response and more practical.

Description

Technical Field

[0001] The present application relates to the technical field of testing devices, and in particular to an air permeability tester. Background Art

[0002] The diaphragm serves to separate the positive and negative electrodes in the battery, so as to increase the specific capacity and specific energy of the battery and reduce the internal resistance of the battery. The air permeability of the diaphragm has an important impact on the performance of the diaphragm. Therefore, the air permeability of the battery diaphragm needs to be tested before leaving the factory.

[0003] In the prior art, the air permeability test needs to rely on different pressure differences and the amount of water passing through the diaphragm, so it is not only complicated in structure but also cumbersome in operation.

[0004] Therefore, the existing testing methods need to be improved. Utility Model Content

[0005] In view of this, the present application provides an air permeability tester to solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An air permeability tester, comprising:

[0008] at least one clamping drive mechanism connected to the chassis via a frame;

[0009] at least one clamping air nozzle assembly connected to the corresponding clamping drive mechanism;

[0010] at least one supporting air nozzle assembly correspondingly disposed below the clamping air nozzle assembly, the test piece being clamped between the clamping air nozzle assembly and the supporting air nozzle assembly;

[0011] The clamping drive mechanism drives the clamping air nozzle assembly to move, so that the first air cylinder of the clamping air nozzle assembly vents to the second air cylinder of the supporting air nozzle assembly, so that the gas passes through the test piece, thereby measuring the air permeability of the test piece.

[0012] Furthermore, the clamping drive mechanism is driven by a cylinder, and the first air cylinder is connected to the lower end of the cylinder.

[0013] Furthermore, the clamping air nozzle assembly also includes a first rubber ring connected to the lower end of the first air cylinder.

[0014] Furthermore, the supporting air nozzle assembly also includes a second rubber ring connected to the upper end of the second air cylinder.

[0015] Furthermore, the test piece can be clamped between the first rubber ring and the second rubber ring.

[0016] Furthermore, the first gas cylinder includes a first outer cylinder and a first inner cylinder disposed therein, and the first inner cylinder is used to transport gas to the test piece.

[0017] Furthermore, the first rubber ring is connected to the lower ends of the first outer tube and the first inner tube.

[0018] Furthermore, the second gas cylinder includes a second outer cylinder and a second inner cylinder disposed therein, and the second inner cylinder is used to discharge gas.

[0019] Furthermore, the second rubber ring is connected to the lower ends of the second outer tube and the second inner tube.

[0020] Furthermore, two second rubber rings with different inner diameters are included.

[0021] It can be seen from the above technical solution that the advantages of the utility model are:

[0022] 1. The present application adopts a gas testing method, which can be realized only by introducing gas, so it is not only simple in structure but also convenient and reliable in operation.

[0023] 2. In the present application, the edge of the diaphragm test piece is sealed by the first rubber ring and the second rubber ring, so that the gas can only pass through the diaphragm test piece, thereby making the test result more accurate and reliable.

[0024] 3. In the present application, the test piece is placed on the second rubber ring, and the first air cylinder is driven downward by the air cylinder. The first rubber ring at the lower end of the first air cylinder will tightly hold the diaphragm test piece, so that the diaphragm test piece is tightly clamped between the first rubber ring and the second rubber ring, thereby ensuring the sealing during the test. The gas is injected through the first air cylinder. When penetrating the diaphragm test piece, the diaphragm test piece generates resistance to air penetration, thereby determining the air pressure between the first air cylinder and the diaphragm test piece. By measuring the air pressure value, the air permeability value equivalent to the isolation seconds can be calculated. The present application is not only simple and convenient to operate, but also has a simple structure and accurate testing, thus being more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0026] Figure 1 This is a schematic diagram of the structure of this application.

[0027] Figure 2 This is the right side view of this application.

[0028] Figure 3This is a three-dimensional diagram of the present application.

[0029] Figure 4 This is a right side cross-sectional view of the present application.

[0030] Figure 5 It is a three-dimensional diagram of the local structure of this application.

[0031] Figure 6 This is a three-dimensional diagram of the supporting air nozzle assembly of the present application.

[0032] List of reference numerals: chassis 1, air vent 11, operating screen 2, frame 3, clamping drive mechanism 4, cylinder 41, fixed shell 42, output end protection cover 43, mounting seat 44, clamping air nozzle assembly 5, first outer cylinder 51, first air hole 511, first inner cylinder 52, first mounting flange 53, first rubber ring 54, first ventilation pipe 55, supporting air nozzle assembly 6, base 61, second air hole 611, second outer cylinder 62, second mounting flange 621, second inner cylinder 63, second rubber ring 64, second ventilation pipe 65. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the implementation modes and the accompanying drawings. Here, the illustrative implementation modes and descriptions of the present application are used to explain the present application, but are not intended to limit the present application.

[0034] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0035] In addition, the terms “first” and “second” are merely used for distinction in description and have no special meanings.

[0036] refer to Figures 1 to 6 ,like Figure 1As shown, this embodiment provides an air permeability tester, which can solve the problems of complex structure, high cost and many operation steps of the test device in the prior art. The present application is not only simple in structure, but also easy to operate and has high accuracy of test results, so it is more practical. The air permeability tester includes: two clamping drive mechanisms 4, two clamping air nozzle assemblies 5, two supporting air nozzle assemblies 6 and a chassis 1, wherein the clamping drive mechanism 4 is connected to the chassis 1 through a frame 3; the clamping air nozzle assembly 5 is connected to the lower part of the corresponding clamping drive mechanism 4; the supporting air nozzle assembly 6 is arranged on the chassis 1, and the supporting air nozzle assembly 6 is arranged under the corresponding clamping air nozzle assembly 5. The test piece is a lithium-ion battery diaphragm, which is clamped between the clamping air nozzle assembly 5 and the supporting air nozzle assembly 6 during the test; wherein the clamping drive mechanism 4 drives the clamping air nozzle assembly 5 to move, so that the first air cylinder of the clamping air nozzle assembly 5 vents to the second air cylinder of the supporting air nozzle assembly 6, so that the gas passes through the diaphragm test piece, thereby measuring the air permeability of the diaphragm test piece.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the clamping drive mechanism 4 includes a cylinder 41, a fixed shell 42 and a mounting seat 44. The cylinder 41 is installed in the frame 3, the fixed shell 42 is connected to the lower end of the frame 3, the output end protection cover 43 is connected to the lower end of the fixed shell 42, the output end protection cover 43 can protect the output end of the cylinder 41, and the mounting seat 44 is connected between the output end of the cylinder 41 and the first outer tube 51 of the clamping air nozzle assembly 5.

[0038] like Figure 5 As shown, the first gas cylinder includes a first outer cylinder 51 and a first inner cylinder 52. The first inner cylinder 52 is located inside the first outer cylinder 51. The first inner cylinder 52 is used to transport gas to the diaphragm test piece.

[0039] Preferably, in the embodiment of the present application, the upper end of the first inner tube 52 is connected to a first ventilation pipe 55, and the upper end of the first outer tube 51 is provided with a first air connection hole 511. The first ventilation pipe 55 passes through the first air connection hole 511 and is connected to an external air source, through which compressed gas can be transported into the first inner tube 52.

[0040] like Figure 4 and Figure 5 As shown, the clamping air nozzle assembly 5 further includes a first rubber ring 54 , and the first rubber ring 54 is connected to the lower ends of the first outer tube 51 and the first inner tube 52 .

[0041] Preferably, in the embodiment of the present application, the lower end of the first outer cylinder 51 has a first mounting flange 53, the first rubber ring 54 is installed in the first mounting flange 53, and the upper end surface of the first rubber ring 54 is connected to the bottom end surface of the first inner cylinder 52, so that a seal is formed between the first inner cylinder 52 and the first rubber ring 54.

[0042] like Figure 4 and Figure 6 As shown, the supporting air nozzle assembly 6 also includes a base 61 and a second rubber ring 64 , the second rubber ring 64 is connected to the upper end of the second air cylinder, and the base 61 is arranged on the chassis 1 .

[0043] like Figure 6 As shown, the second gas cylinder includes a second outer cylinder 62 and a second inner cylinder 63. The second outer cylinder 62 and the second inner cylinder 63 are both arranged on the base 61. The second inner cylinder 63 is located inside the second outer cylinder 62. The second inner cylinder 63 is used to discharge gas.

[0044] Preferably, in the embodiment of the present application, the second rubber ring 64 is connected to the lower ends of the second outer cylinder 62 and the second inner cylinder 63 .

[0045] Preferably, in the embodiment of the present application, the upper end of the second outer cylinder 62 has a second mounting flange 621, the second rubber ring 64 is installed in the second mounting flange 621, and the bottom end surface of the second rubber ring 64 is connected to the upper end surface of the second inner cylinder 63, so that a seal is formed between the second inner cylinder 63 and the second rubber ring 64.

[0046] In the embodiment of the present application, the diaphragm test piece can be clamped between the first rubber ring 54 and the second rubber ring 64 .

[0047] Preferably, in the embodiment of the present application, a second air hole 611 is provided on the base 61, and the second air hole 611 extends inwardly into the second outer tube 62. A second ventilation pipe 65 is connected to the second inner tube 63, and the second ventilation pipe 65 extends outward for a distance after passing through the second air hole 611. After the test, the second ventilation pipe 65 is connected to the second air hole 611 to allow the gas to be discharged, thereby achieving the effect of pressure relief.

[0048] In the embodiment of the present application, two clamping drive mechanisms 4, two clamping air nozzle assemblies 5, and two supporting air nozzle assemblies 6 enable the chassis 1 to have two workstations, which can test two diaphragm test pieces at the same time, thereby improving work efficiency.

[0049] Preferably, in the embodiment of the present application, the inner diameters of the second rubber rings 64 of the two workstations are different, so that diaphragm test pieces of different widths can be tested at the same time.

[0050] The second rubber ring 64 is used in conjunction with the second inner tube 63 . When the inner diameter of the second rubber ring 64 changes, the inner diameter of the second inner tube 63 also changes accordingly, so that the inner diameter of the second inner tube 63 is always between the outer diameter and the inner diameter of the second rubber ring 64 .

[0051] Preferably, in the embodiment of the present application, ventilation holes 11 are provided on the side of the chassis 1 to increase the overall heat dissipation.

[0052] Preferably, in the embodiment of the present application, an operating screen 2 is also provided on the chassis 1, which is a large-screen color touch screen with Chinese and English interfaces and a menu-based operating mode to facilitate the operation of the operating system.

[0053] Preferably, in the embodiment of the present application, the chassis 1 is also provided with a high-precision pressure transmitter to facilitate the collection of the test pressure and the real-time feedback of the test pressure.

[0054] Preferably, in the embodiment of the present application, a large-capacity buffer cylinder is also provided on the chassis 1 to avoid pressure fluctuations caused by sample degassing.

[0055] Preferably, in the embodiment of the present application, a thermal flow mass flowmeter is also provided on the chassis 1 for monitoring the leakage airflow of the sample, and has high stability in use.

[0056] Preferably, in the embodiment of the present application, the first outer cylinder 51, the first inner cylinder 52, the second outer cylinder 62, and the second inner cylinder 63 are all made of 40Cr special steel, which is quenched and then ground, and then sealed with the first rubber ring 54 and the second rubber ring 64, which can ensure that the sample fits tightly without leakage.

[0057] Preferably, in the embodiment of the present application, the present application is equipped with a printer interface, and data reports can be directly printed when connected to a printer.

[0058] Preferably, in the embodiment of the present application, the present application is equipped with online software, which can transmit data through the PC serial port, and the test data can be automatically and immediately transmitted to the PC end to be displayed in the dedicated software, and can be exported in CSV (Excel) format.

[0059] Preferably, in the embodiment of the present application, the present application comes with a standard device to facilitate daily calibration. The standard device is a commonly used device in the prior art, so it will not be described in detail.

[0060] Preferably, in the embodiment of the present application, the test area of ​​station 1 is 6.42 cm 2 , the test area of ​​station 2 is 3.21cm 2 .

[0061] Preferably, in the embodiment of the present application, the sample thickness is 3 μm to 25 μm.

[0062] Preferably, in the embodiment of the present application, the width of the sample is 25 mm to 50 mm.

[0063] Test time: 1s~999s, the test result can be automatically calculated within 3s.

[0064] Flow test range: ≤200cc / min, accuracy: 1%FS (30cc / min, 1000cc / min optional, other ranges can be customized).

[0065] Test repeatability: When testing the same point three times, the error of the measurement results is guaranteed to be within 2sec / 100cc.

[0066] Test stability: for products of different specifications, the error between the instrument test result and the reference value is guaranteed to be within 3sec / 100cc for each specification. For products of the same specification, 1S, 3S, 5S, and 10S tests are applicable, and the result error is ≤2sec / 100cc.

[0067] Working principle: The diaphragm test piece is placed on the second rubber ring 64, and the cylinder 41 is started to drive the clamping air nozzle assembly 5 to move downward, so that the first rubber ring 54 is pressed on the diaphragm test piece. At this time, the supporting air nozzle assembly 6 plays a role of sealing and leak prevention. Then, the first ventilation pipe 55 passes compressed gas into the first inner cylinder 52. When the compressed gas penetrates the diaphragm test piece, due to the sealing of the supporting air nozzle assembly 6, the diaphragm test piece will generate impedance to the penetration of compressed air. This impedance determines the pressure difference between the first inner cylinder 52 and the diaphragm test piece. Then, the flow rate after passing through the diaphragm test piece is collected and measured by a high-precision gas flow transmitter, and the time required to reach the set flow rate is theoretically calculated based on this. Then, the average gas flow rate per unit area of ​​the diaphragm test piece under unit time and unit pressure difference is calculated in combination with the test flow rate, test pressure, test area and time, which is the air permeability of the diaphragm test piece. After penetrating the diaphragm test piece, the compressed gas will pass through the second inner cylinder 63 and the second ventilation pipe 65 and be discharged from the second air receiving hole 611 for pressure relief.

[0068] In summary, the present application is not only simple in structure, but also the installation of the test piece is ergonomic, the installation is convenient and fast, and the operation is convenient and reliable, and the test results can be obtained quickly, which is more efficient and practical.

[0069] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the embodiments of the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An air permeability tester, characterized in that: include: At least one clamping drive mechanism (4) connected to the chassis (1) via a frame (3); at least one clamping air nozzle assembly (5) connected to the corresponding clamping drive mechanism (4); at least one supporting air nozzle assembly (6) correspondingly arranged below the clamping air nozzle assembly (5), the test piece being clamped between the clamping air nozzle assembly (5) and the supporting air nozzle assembly (6); The clamping drive mechanism (4) drives the clamping air nozzle assembly (5) to move, so that the first air cylinder of the clamping air nozzle assembly (5) vents air to the second air cylinder of the supporting air nozzle assembly (6), so that the gas passes through the test piece, thereby measuring the air permeability of the test piece.

2. The air permeability tester according to claim 1, characterized in that: The clamping drive mechanism (4) is driven by a cylinder (41), and the first air cylinder is connected to the lower end of the cylinder (41).

3. The air permeability tester according to claim 1, characterized in that: The clamping air nozzle assembly (5) also includes a first rubber ring (54) connected to the lower end of the first air cylinder.

4. The air permeability tester according to claim 3, characterized in that: The supporting air nozzle assembly (6) further comprises a second rubber ring (64) connected to the upper end of the second air cylinder.

5. The air permeability tester according to claim 4, characterized in that: The test piece can be clamped between the first rubber ring (54) and the second rubber ring (64).

6. The air permeability tester according to claim 3, characterized in that: The first gas cylinder comprises a first outer cylinder (51) and a first inner cylinder (52) disposed therein, and the first inner cylinder (52) is used to transport gas to the test piece.

7. The air permeability tester according to claim 6, characterized in that: The first rubber ring (54) is connected to the lower ends of the first outer tube (51) and the first inner tube (52).

8. The air permeability tester according to claim 4, characterized in that: The second gas cylinder comprises a second outer cylinder (62) and a second inner cylinder (63) disposed therein, and the second inner cylinder (63) is used to discharge gas.

9. The air permeability tester according to claim 8, characterized in that: The second rubber ring (64) is connected to the lower ends of the second outer cylinder (62) and the second inner cylinder (63).

10. The air permeability tester according to claim 1, characterized in that: It also includes two second rubber rings (64) with different inner diameters.

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