Diaphragm testing device

Abstract

The utility model discloses a diaphragm testing device which comprises a testing box and a loading box communicated with the testing box, a fixing device is arranged in the testing box, a testing assembly is arranged in the loading box, the testing assembly is connected with a lifting driving assembly, and the lifting driving assembly penetrates through the loading box and is connected with the loading box in a sealing mode. The testing assembly comprises a mounting seat, a testing needle and an electric heating sleeve used for heating the testing needle, a pressure sensor is arranged between the mounting seat and the lifting driving assembly, and the testing needle is arranged opposite to the loaded diaphragm. The test box is provided with the gas interface and the sensor mounting port, the test box and the loading box are vacuumized before testing, the testing work is carried out in a vacuum environment, and the testing stability is ensured. According to the device, the puncture strength and the membrane rupture temperature of the membrane can be tested, two testing functions can be achieved through one device, the membrane can be rapidly fixed and disassembled through the membrane fixing device, and the sampling inspection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm testing, and more particularly to a diaphragm testing device. Background Art

[0002] With the rapid development of new energy vehicles, the market demand for lithium batteries is increasing. Lithium-ion batteries offer advantages such as high energy density, environmental friendliness, high power density, and low self-discharge, making them an essential power source for new energy vehicles, particularly pure electric vehicles. However, recent accidents involving new energy vehicles have heightened awareness of lithium battery safety. The separator is a crucial component of lithium batteries, allowing lithium ions to pass through while simultaneously isolating the positive and negative electrodes, preventing short circuits and ensuring battery safety. However, for various reasons, lithium dendrites can form, damaging the SEI membrane and even piercing the separator, leading to thermal runaway.

[0003] Therefore, the puncture strength and rupture temperature of the separator are crucial to the safety of the battery. The existing separator testing device has a relatively cumbersome testing process and a complex device structure, which makes it inconvenient to frequently replace the separator. Utility Model Content

[0004] The purpose of the present invention is to provide a diaphragm testing device to solve the technical problems existing in the above-mentioned background technology.

[0005] The technical solution of the utility model provides a diaphragm testing device, comprising a test box and a loading box connected to the test box, wherein a fixing device is provided in the test box, and a diaphragm is detachably mounted on the fixing device; a test assembly is provided in the loading box, and a lifting drive assembly is connected to the test assembly, and the lifting drive assembly passes through the loading box and is sealed with the loading box;

[0006] The test assembly includes a mounting seat, a test needle, and an electric heating sleeve for heating the test needle. A pressure sensor is arranged between the mounting seat and the lifting drive assembly. The test needle is arranged opposite to the loaded diaphragm, and the lifting drive assembly drives the test needle to move in a direction close to or away from the diaphragm.

[0007] In a preferred embodiment, the fixing device includes two symmetrically arranged fixing supports and a locking member rotatably arranged on the fixing supports, and the diaphragm is supported by the fixing supports and locked by the locking member.

[0008] In a preferred embodiment, the locking member includes a locking column and a locking block located on the locking column. The diaphragm is arranged on the diaphragm frame. Positioning blocks are arranged on both sides of the diaphragm frame. A positioning notch is arranged on the positioning block. The locking column is arranged through the positioning notch.

[0009] In a preferred embodiment, the diameter of the locking column is adapted to the width of the positioning notch, and the locking block horizontally extends outward from the outside of the locking column.

[0010] In a preferred embodiment, two limiting grooves are symmetrically provided in the loading box, and limiting blocks are provided on both sides of the mounting seat. The limiting blocks are located in the limiting grooves and are slidably connected to the limiting grooves.

[0011] In a preferred embodiment, the lifting drive assembly includes a lifting drive cylinder.

[0012] In a preferred embodiment, a temperature sensor is provided outside the test needle.

[0013] In a preferred embodiment, the test box is provided with a gas interface and a sensor installation port.

[0014] The beneficial effects of the technical solution of this utility model are:

[0015] The test chamber is equipped with a gas interface and sensor mounting ports. Before testing, the test chamber and loading box are evacuated. Testing is performed in a vacuum environment to ensure test stability. This device can test both diaphragm puncture strength and rupture temperature, achieving two test functions in one device. The diaphragm fixing device allows for quick diaphragm fixing and removal, improving sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of the utility model.

[0018] Figure 3 This is a schematic structural diagram of the fixing device of the present utility model.

[0019] Explanation of the accompanying reference numerals: 1 test box, 2 loading box, 3 fixing device, 31 fixed support, 32 locking column, 33 locking block, 4 diaphragm, 5 diaphragm frame, 51 positioning block, 52 positioning notch, 6 limit groove, 7 test assembly, 71 mounting seat, 72 test needle, 73 electric heating sleeve, 74 pressure sensor, 75 temperature sensor, 76 limit block, 77 lifting drive cylinder, 8 gas interface, 9 sensor mounting port, 10 observation window. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and convenience of description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Numerous modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

[0021] like Figure 1-3 As shown, the technical solution of the utility model provides a diaphragm testing device, including a test box 1 and a loading box 2 connected to the test box 1, a fixing device 3 is provided in the test box 1, and a diaphragm 4 is detachably provided on the fixing device 3, a test component 7 is provided in the loading box 2, and a lifting drive component is connected to the test component 7, and the lifting drive component passes through the loading box 2 and is sealed with the loading box 2.

[0022] The test box 1 is provided with a gas interface 8 and a sensor installation port 9. Before the test, the test box 1 and the loading box 2 are evacuated. The test work is carried out in a vacuum environment to ensure the stability of the test. The test box 1 is also provided with an observation window 10 for observing the test situation. This device can realize the puncture strength and membrane rupture temperature test of the diaphragm 4. During the test, the diaphragm 4 is loaded on the fixing device 3, and then the test box 1 is evacuated. Then, the test component 7 is driven down by the lifting drive component to perform the puncture strength test or the membrane rupture temperature test. When testing the puncture strength, the pressure when the diaphragm 4 is punctured is tested. When testing the membrane rupture temperature, the test component contacts the diaphragm and tests the temperature of the scalding film. In this solution, one device realizes two test functions, and the diaphragm 4 fixing device 3 can realize the rapid fixation and disassembly of the diaphragm 4, thereby improving the efficiency of random inspections.

[0023] The test assembly 7 includes a mounting base 71, a test needle 72, and an electric heating sleeve 73 for heating the test needle 72. A pressure sensor 74 is arranged between the mounting base 71 and the lifting drive assembly. The test needle 72 is arranged opposite to the loaded diaphragm 4. The lifting drive assembly drives the test needle 72 to move in a direction close to or away from the diaphragm 4.

[0024] When testing the puncture strength, a light judgment is made based on the reading displayed on the pressure sensor 74. When testing the membrane rupture temperature, as the temperature of the heating needle increases, the puncture strength of the membrane 4 gradually decreases when the temperature rises to a certain range. When the puncture strength remains basically unchanged with the temperature change, the temperature at this time is the membrane rupture temperature of the membrane 4.

[0025] The fixing device 3 includes two symmetrically arranged fixing supports 31 and a locking member rotatably mounted on the fixing supports 31. The diaphragm 4 is supported by the fixing supports 31 and locked by the locking member. The locking member includes a locking column 32 and a locking block 33 located on the locking column 32. The diaphragm 4 is mounted on a diaphragm frame 5. Positioning blocks 51 are provided on both sides of the diaphragm frame 5. Each positioning block 51 has a positioning notch 52, through which the locking column 32 is inserted. The diameter of the locking column 32 is adapted to the width of the positioning notch 52, and the locking block 33 extends horizontally outward from the exterior of the locking column 32.

[0026] In the above scheme, the diaphragm 4 is fixed by the diaphragm 4 test frame and is in a uniform straightened state. The two positioning blocks 51 on the diaphragm 4 test frame are respectively clamped on the two locking columns 32 and supported by the fixed support 31. Because the locking column 32 is rotatably set on the fixed support 31, the locking block 33 on the locking column 32 is located above the positioning block 51 by rotating the locking column 32, thereby locking the positioning block 51 and ensuring that the position of the diaphragm 4 is fixed to avoid displacement during testing. At the same time, the above-mentioned fixing method is convenient for disassembly and assembly, and improves the fixing efficiency.

[0027] Two limiting slots 6 are symmetrically arranged in the loading box 2. Limiting blocks 76 are provided on both sides of the mounting seat 71. The limiting blocks 76 are located in the limiting slots 6 and are slidably connected to the limiting slots 6. The lifting drive assembly includes a lifting drive cylinder 77. During testing, the lifting drive cylinder 77 drives the mounting seat 71 to move. The mounting seat 71 is limited by the limiting slots 6 on both sides during movement to ensure smooth movement. A temperature sensor 75 is provided on the outside of the test needle 72. The temperature sensor 75 can measure the temperature of the test needle 72, facilitating timely adjustment of the heating power of the electric heating sleeve 73 to achieve flexible control of the puncture needle temperature.

[0028] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making any creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in this utility model shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A diaphragm testing device, characterized in that: The invention comprises a test box and a loading box connected to the test box, wherein a fixing device is provided in the test box, a diaphragm is detachably provided on the fixing device, a test assembly is provided in the loading box, a lifting drive assembly is connected to the test assembly, and the lifting drive assembly passes through the loading box and is sealed with the loading box; The test assembly includes a mounting seat, a test needle, and an electric heating sleeve for heating the test needle. A pressure sensor is arranged between the mounting seat and the lifting drive assembly. The test needle is arranged opposite to the loaded diaphragm, and the lifting drive assembly drives the test needle to move in a direction close to or away from the diaphragm.

2. A diaphragm testing device according to claim 1, characterized in that: The fixing device includes two symmetrically arranged fixing supports and a locking piece rotatably arranged on the fixing supports. The diaphragm is supported by the fixing supports and locked by the locking piece.

3. A diaphragm testing device according to claim 2, characterized in that: The locking member includes a locking column and a locking block located on the locking column. The diaphragm is arranged on the diaphragm frame. Positioning blocks are arranged on both sides of the diaphragm frame. The positioning blocks are provided with positioning notches. The locking column is arranged through the positioning notches.

4. The diaphragm testing device according to claim 3, characterized in that: The diameter of the locking column is adapted to the width of the positioning notch, and the locking block horizontally extends outward from the outside of the locking column.

5. The diaphragm testing device according to claim 1, characterized in that: Two limiting grooves are symmetrically arranged in the loading box, and limiting blocks are arranged on both sides of the mounting seat. The limiting blocks are located in the limiting grooves and are slidably connected to the limiting grooves.

6. The diaphragm testing device according to claim 1, characterized in that: The lifting drive assembly includes a lifting drive cylinder.

7. The diaphragm testing device according to claim 1, characterized in that: A temperature sensor is arranged outside the test needle.

8. The diaphragm testing device according to claim 1, characterized in that: The test box is provided with a gas interface and a sensor installation port.

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