Detection equipment for air permeability of lithium battery diaphragm and use method of detection equipment

Abstract

The invention discloses detection equipment for air permeability of a lithium battery diaphragm and a use method of the detection equipment, and belongs to the field of detection. Comprising a machine body assembly and a lifting assembly, and the lifting assembly is located above the machine body assembly and is matched with the machine body assembly by adjusting the height to detect the air permeability of a diaphragm. According to the detection equipment for the air permeability of the lithium battery diaphragm and the use method of the detection equipment, the technical problems that most of the detection ends of current diaphragm air permeability detection equipment are exposed outside, the detection time is relatively long, environmental factors are varied, and the standards of temperature and humidity are difficult to control, so that the accuracy of detection data is influenced are solved.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and specifically to a detection device for the air permeability of a lithium battery diaphragm and a method for using the same. Background Art

[0002] Lithium battery is a high energy density, lightweight, high efficiency storage battery, which has been widely used in electric vehicles, smart phones and other fields. Lithium battery consists of positive electrode, negative electrode, electrolyte, diaphragm and shell. Among them, the diaphragm is a key component to separate the positive and negative electrodes, and its air permeability has a great influence on battery performance and safety. The air permeability of the diaphragm determines the oxygen permeability between the positive and negative electrodes inside the battery, affecting the discharge performance and cycle life of the battery. Generally speaking, lithium battery diaphragms are required to have high air permeability to ensure good ventilation inside the battery.

[0003] During the membrane air permeability test, the test environment has a great impact on the test results. At present, the test ends of most membrane air permeability test equipment are exposed to the outside and the test time is relatively long. Environmental factors are changeable, and the temperature and humidity standards are difficult to control, which affects the accuracy of the test data.

[0004] Therefore, it is necessary to provide a detection device for the gas permeability of lithium battery diaphragms and a method for using the same to solve the above problems. Summary of the invention

[0005] Based on the above problems existing in the prior art, the purpose of the present application is to provide a detection device for the air permeability of a lithium battery diaphragm and a method of using the same, so as to solve the problems raised in the above background technology.

[0006] The technical solution adopted by the present application to solve its technical problem is: a device for detecting the air permeability of a lithium battery diaphragm and a method for using the device, comprising a body assembly and a lifting assembly, wherein the lifting assembly is located above the body assembly and detects the air permeability of the diaphragm by adjusting the height to cooperate with the body assembly;

[0007] The fuselage assembly includes a casing, and the casing also includes a working platform, a functional platform, a deflation seat, and a lofting platform arranged from bottom to top, the working platform is located inside the card slot, and four working holes are opened on the outer surface of the functional platform, and the working platform and the functional platform are connected to the inside of the casing;

[0008] The bottom surface of the housing is fixedly connected with a humidity adjustment device, a heating device, an air pressure detection sensor, and a temperature and humidity sensor;

[0009] The lifting assembly includes two cylinders, and the two cylinders are fixedly connected to the bottom of the casing. The telescopic ends of the two cylinders are fixedly connected to a connecting plate, and the top of the connecting plate is fixedly connected to a gas-making device. The bottom of the gas-making device is connected to a connecting head, and an isolation cover is fixedly connected to the outer peripheral wall of the connecting head. An installation groove is opened on the outer peripheral wall of the isolation cover near the bottom, and a rubber ring is nested in the installation groove.

[0010] Furthermore, the body assembly also includes a test bench and an operation panel, the test bench is fixedly connected to the top of the casing, the operation panel is located on one side of the casing, and a connection opening is provided on the top of the test bench.

[0011] Furthermore, a grille is provided on one side of the casing, the grille is communicated with the interior of the casing, a slot is provided on the top surface of the casing, and the outermost diameter of the slot is consistent with the diameter of the connecting opening.

[0012] Furthermore, an air outlet pipe is fixedly connected inside the air release seat, one end of the air outlet pipe is communicated with the lofting platform, and the other end of the air outlet pipe is located inside the casing.

[0013] Furthermore, the model of the air pressure detection sensor is: BMP180, and the model of the temperature and humidity sensor is: DHT11.

[0014] Furthermore, one side of the gas production device is connected to an air inlet pipe.

[0015] Furthermore, the connector is concentrically arranged with the lofting platform and has the same diameter, and the thickness of the isolation cover is consistent with the size of the card slot.

[0016] Furthermore, one end of the humidity regulating device, the heating device, the air pressure detection sensor, and the temperature and humidity sensor is sealed and connected to the working hole and the length is within the inner diameter range of the card slot.

[0017] Furthermore, the operation panel, the cylinder, the gas making device, the humidity regulating device, the heating device, the air pressure detection sensor, and the temperature and humidity sensors are electrically connected to the control center.

[0018] Further, the following steps are included:

[0019] Step 1: Place the lithium battery diaphragm on top of the lofting platform and start the cylinder to descend through the control center;

[0020] Step 2: The control center starts the gas making device, collects air into the gas making device, and converts it into experimental gas for testing the gas permeability of the lithium battery separator;

[0021] Step 3: Start the air pressure detection sensor through the control center and compare it with the set normal air pressure.

[0022] The beneficial effects of the present application are as follows: the present application provides a device for testing the air permeability of lithium battery diaphragms and a method for using the device. The device places the sample placement platform and the connector inside an isolation cover, seals the interior with a rubber ring, and detects the space inside the isolation cover through an air pressure detection sensor to determine whether the contact pieces at both ends of the tested lithium battery diaphragm firmly seal the lithium battery diaphragm, thereby determining the validity of the experimental data. The device is equipped with a humidity regulating device and a heating device to regulate the environment for lithium battery diaphragm testing, thereby reducing the possibility that environmental factors affect the accuracy of the test results. The present invention solves the technical problem that most of the detection ends of current diaphragm air permeability testing equipment are exposed to the outside and the detection time is relatively long, the environmental factors are variable, and the temperature and humidity standards are difficult to control, thereby affecting the accuracy of the test data.

[0023] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present application, are used to provide 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 improper limitations on the present application.

[0025] In the attached picture:

[0026] Figure 1 It is an overall schematic diagram of this application;

[0027] Figure 2 It is a schematic diagram of the fuselage assembly of this application;

[0028] Figure 3 A schematic diagram of the casing of the present application;

[0029] Figure 4 This is a schematic diagram of the interior of the casing of the present application;

[0030] Figure 5 A schematic diagram of the lifting assembly of this application;

[0031] Figure 6 This is a schematic diagram of the interior of the isolation cover of this application;

[0032] Figure 7 This is a schematic diagram of the position of the lifting assembly of the present application after it has been lowered;

[0033] Figure 8 For this application Figure 7 Enlarged schematic diagram of area A in the middle;

[0034] Among them, the reference numerals in the figure are:

[0035] 1. Body assembly; 101. Casing; 1011. Grille; 1012. Card slot; 1013. Working platform; 1014. Functional platform; 10141. Working hole; 1015. Air release seat; 1016. Locating platform; 1017. Exhaust pipe; 102. Test bench; 1021. Connecting opening; 103. Operation panel; 2. Lifting assembly; 201. Cylinder; 202. Connecting plate; 203. Gas making device; 2031. Inlet pipe; 204. Connecting head; 205. Isolation cover; 2051. Mounting slot; 206. Rubber ring; 3. Humidity adjustment device; 4. Heating device; 5. Air pressure detection sensor; 6. Temperature and humidity sensor. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0038] like Figure 1-8 As shown, the present application provides a technical solution: a device for detecting the air permeability of a lithium battery diaphragm and a method of using the device, comprising a body component 1 and a lifting component 2, wherein the lifting component 2 is located above the body component 1, and the air permeability of the diaphragm is detected by adjusting the height to cooperate with the body component 1.

[0039] like Figure 2 As shown, the body assembly 1 includes a housing 101, a test bench 102 and an operation panel 103. The test bench 102 is fixedly connected to the top of the housing 101, and the operation panel 103 is located on one side of the housing 101 for controlling the device.

[0040] A connection opening 1021 is formed on the top of the test bench 102 .

[0041] like Figure 3As shown, a grille 1011 is provided on one side of the casing 101, and the grille 1011 is connected to the interior of the casing 101, and air can enter the interior of the casing 101 from the grille 1011. A slot 1012 is provided on the top surface of the casing 101, and the outermost diameter of the slot 1012 is consistent with the diameter of the connecting opening 1021. The casing 101 also includes a working platform 1013, a functional platform 1014, a degassing seat 1015, and a layout platform 1016 arranged from bottom to top. The working platform 1013 is located on the inner side of the slot 1012, and four working holes 10141 are provided on the outer surface of the functional platform 1014. The working platform 1013 and the functional platform 1014 are connected to the interior of the casing 101.

[0042] like Figure 4 As shown, an air outlet pipe 1017 is fixedly connected inside the air release seat 1015, one end of the air outlet pipe 1017 is connected to the sample setting platform 1016, and the other end of the air outlet pipe 1017 is located inside the housing 101. A humidity adjustment device 3, a heating device 4, an air pressure detection sensor 5, and a temperature and humidity sensor 6 are fixedly connected to the bottom surface of the housing 101, and one end of the humidity adjustment device 3, the heating device 4, the air pressure detection sensor 5, and the temperature and humidity sensor 6 is sealed and connected to the working hole 10141, and the length is within the inner diameter range of the card slot 1012.

[0043] The model of the air pressure detection sensor 5 is: BMP180, and the model of the temperature and humidity sensor 6 is: DHT11.

[0044] like Figure 5 , 6 As shown, the lifting assembly 2 includes two cylinders 201, and the two cylinders 201 are fixedly connected to the bottom of the casing 101. The telescopic ends of the two cylinders 201 are fixedly connected to a connecting plate 202. The top of the connecting plate 202 is fixedly connected to a gas-making device 203. One side of the gas-making device 203 is connected to an air inlet pipe 2031. The bottom of the gas-making device 203 is connected to a connecting head 204. An isolation cover 205 is fixedly connected to the outer peripheral wall of the connecting head 204. An installation groove 2051 is opened on the outer peripheral wall of the isolation cover 205 near the bottom, and a rubber ring 206 is nested in the installation groove 2051.

[0045] The connector 204 is concentrically disposed with the layout platform 1016 and has the same diameter. The thickness of the isolation cover 205 is consistent with the size of the card slot 1012 , and the isolation cover 205 can be placed in the card slot 1012 .

[0046] The operation panel 103, the air cylinder 201, the gas making device 203, the humidity adjusting device 3, the heating device 4, the air pressure detection sensor 5, and the temperature and humidity sensor 6 are electrically connected to the control center.

[0047] In one embodiment, a worker places a lithium battery diaphragm on top of the layout platform 1016, and starts the cylinder 201 to descend through the control center, thereby driving the isolation cover 205 and the connector 204 to descend. When the connector 204 contacts the layout platform 1016 to press the lithium battery diaphragm, the isolation cover 205 is located in the slot 1012, and the rubber ring 206 forms a sealed connection with the inner wall of the slot 1012. At this time, the isolation cover 205 and the working platform 1013 form a closed space.

[0048] The control center controls the gas making device 203 to start, and the gas making device 203 collects air into the gas making device 203 through the air inlet pipe 2031, and converts it into experimental gas for testing the air permeability of the lithium battery diaphragm. After passing through the lithium battery diaphragm, the gas enters the sample platform 1016 and then flows out from the air outlet pipe 1017. The gas flow rate out of the air outlet pipe 1017 is tested, and the permeability is calculated by combining other factors.

[0049] During the detection process, the air pressure detection sensor 5 is started through the control center. The air pressure detection sensor 5 can measure the air pressure in the space between the isolation cover 205 and the working platform 1013 and compare it with the set normal air pressure. If the test result is inconsistent with the preset normal value, it means that there is a problem with the sealing between the layout platform 1016 and the connecting head 204, which causes the air flow to flow into the space formed by the isolation cover 205 and the working platform 1013, and the value of this air permeability test is unqualified.

[0050] The device is provided with an isolation cover 205 to place the sample placement platform 1016 and the connector 204 inside, and the interior is sealed by a rubber ring 206. The air pressure detection sensor 5 detects the space inside the isolation cover 205 to determine whether the contact pieces at both ends of the tested lithium battery diaphragm have firmly sealed the lithium battery diaphragm, thereby determining the validity of the experimental data.

[0051] In another embodiment, the lithium battery separator is tested in a cold, dry environment.

[0052] Specifically, the detection is performed in the same manner as the previous embodiment. The environmental data inside the isolation cover 205 detected by the temperature and humidity sensor 6 can be viewed on the operation panel 103. If the humidity does not meet the standard, the humidity adjustment device 3 can be turned on to adjust the humidity index inside the isolation cover 205. If the temperature is too low, the heating device 4 can be turned on by the control center to electrically heat the ambient temperature inside the isolation cover 205, thereby ensuring that the test environment is uniform and making the detected data more accurate.

[0053] The device is provided with a humidity regulating device 3 and a heating device 4, so as to regulate the environment for lithium battery diaphragm detection and reduce the possibility that the accuracy of the detection result is affected by environmental factors.

[0054] In summary, the device places the sample placement platform 1016 and the connector 204 inside the isolation cover 205, seals the interior with a rubber ring 206, and detects the space inside the isolation cover 205 through the air pressure detection sensor 5 to determine whether the contact pieces at both ends of the tested lithium battery diaphragm firmly seal the lithium battery diaphragm, thereby determining the validity of the experimental data. By providing a humidity adjustment device 3 and a heating device 4, the environment for lithium battery diaphragm detection can be regulated to reduce the possibility of environmental factors affecting the accuracy of the detection results. This solves the technical problem that most of the detection ends of the current diaphragm air permeability detection equipment are exposed to the outside and the detection time is relatively long, the environmental factors are changeable, and the temperature and humidity standards are difficult to control, thereby affecting the accuracy of the detection data.

[0055] 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 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. A device for testing the gas permeability of a lithium battery diaphragm, comprising a body component (1) and a lifting component (2), characterized in that: The lifting assembly (2) is located above the fuselage assembly (1), and cooperates with the fuselage assembly (1) by adjusting the height to detect the air permeability of the diaphragm; The fuselage assembly (1) comprises a casing (101), the casing (101) further comprising a working platform (1013), a functional platform (1014), a deflation seat (1015), and a lofting platform (1016) arranged from bottom to top, the working platform (1013) being located inside the card slot (1012), the functional platform (1014) being provided with four working holes (10141) on its outer surface, and the working platform (1013) and the functional platform (1014) being connected to the interior of the casing (101); The bottom surface of the housing (101) is fixedly connected with a humidity adjustment device (3), a heating device (4), an air pressure detection sensor (5), and a temperature and humidity sensor (6); The lifting assembly (2) comprises two cylinders (201), the two cylinders (201) are fixedly connected to the bottom of the casing (101), the telescopic ends of the two cylinders (201) are fixedly connected to a connecting plate (202), the top of the connecting plate (202) is fixedly connected to a gas-making device (203), the bottom of the gas-making device (203) is connected to a connecting head (204), an isolation cover (205) is fixedly connected to the outer peripheral wall of the connecting head (204), an installation groove (2051) is provided on the outer peripheral wall of the isolation cover (205) near the bottom, and a rubber ring (206) is nested in the installation groove (2051).

2. The device for detecting gas permeability of lithium battery diaphragm according to claim 1, characterized in that: The body assembly (1) further comprises a test bench (102) and an operation panel (103); the test bench (102) is fixedly connected to the top of the housing (101); the operation panel (103) is located on one side of the housing (101); and a connection opening (1021) is provided on the top of the test bench (102).

3. The device for detecting gas permeability of lithium battery diaphragm according to claim 2, characterized in that: A grille (1011) is provided on one side of the housing (101), the grille (1011) is communicated with the interior of the housing (101), a slot (1012) is provided on the top surface of the housing (101), and the outermost diameter of the slot (1012) is consistent with the diameter of the connection opening (1021).

4. The device for detecting gas permeability of lithium battery diaphragm according to claim 1, characterized in that: An air outlet pipe (1017) is fixedly connected inside the air release seat (1015), one end of the air outlet pipe (1017) is connected to the sample placement platform (1016), and the other end of the air outlet pipe (1017) is located inside the housing (101).

5. The device for detecting gas permeability of lithium battery diaphragm according to claim 1, characterized in that: The model of the air pressure detection sensor (5) is: BMP180, and the model of the temperature and humidity sensor (6) is: DHT11.

6. The device for detecting gas permeability of lithium battery diaphragm according to claim 5, characterized in that: One side of the gas production device (203) is connected to an air inlet pipe (2031).

7. The device for detecting gas permeability of lithium battery diaphragm according to claim 6, characterized in that: The connector (204) and the layout platform (1016) are arranged concentrically and have the same diameter, and the thickness of the isolation cover (205) is consistent with the size of the card slot (1012).

8. The device for detecting gas permeability of lithium battery diaphragm according to claim 3, characterized in that: One end of the humidity regulating device (3), the heating device (4), the air pressure detection sensor (5), and the temperature and humidity sensor (6) is sealed and connected to the operation hole (10141), and the length is within the inner diameter range of the card slot (1012).

9. The device for detecting gas permeability of lithium battery diaphragm according to claim 1, characterized in that: The operating panel (103), the cylinder (201), the gas making device (203), the humidity regulating device (3), the heating device (4), the air pressure detection sensor (5), and the temperature and humidity sensor (6) are electrically connected to the control center.

10. A method for using a device for detecting gas permeability of a lithium battery diaphragm, using the device for detecting gas permeability of a lithium battery diaphragm as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Place the lithium battery separator on top of the sample placement platform (1016), and start the cylinder (201) to descend through the control center; Step 2: The control center controls the gas production device (203) to start, collects air into the gas production device (203), and converts it into experimental gas for testing the gas permeability of the lithium battery separator; Step 3: Activate the air pressure detection sensor (5) through the control center and compare it with the set normal air pressure.

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