Automatic testing device for air permeability of lithium battery diaphragm

Abstract

The utility model discloses an automatic testing device for air permeability of a lithium battery diaphragm, which comprises a detection base and an air permeability instrument arranged on the detection base and used for testing the air permeability of a diaphragm sample, two groups of winding roller assemblies are further arranged on the detection base, and each winding roller assembly comprises a fixed table arranged on the detection base and a base motor connected with the fixed table. A compression roller for limiting the position of the diaphragm sample is also mounted on the fixed table. The device is simple in structure, the diaphragm is placed between the winding drum component and the compression roller, the control computer is started to control the air permeability instrument and the base motor, the diaphragm is driven by the winding drum component to move forwards and is conveyed to the air permeability instrument through the compression roller, the control computer controls the air permeability instrument to test at the same time, and the diaphragm is conveyed to the other winding drum component through the compression roller after being tested. After the ventilation values of the set distance positions are tested in sequence, test data are uploaded to a computer in real time, so that the whole test process can cancel the work of manually moving the diaphragm, recording the ventilation data and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of manufacturing and testing of lithium battery diaphragms, in particular to an automatic gas permeability testing device for lithium battery diaphragms. Background Art

[0002] In recent years, lithium batteries have been used more and more widely. Lithium batteries are an indispensable component of new energy vehicles and electric vehicles, and diaphragms are an important component of lithium-ion batteries and affect battery performance. The uniformity of diaphragm permeability is a particularly important quality indicator, which directly affects the performance quality of the diaphragm roll. However, the current permeability test is a manual test, which makes it impossible to test the permeability of the diaphragm surface at equal distances, and the test efficiency and labor costs are high. The purpose of the present invention is to provide an automatic test device for the permeability of lithium battery diaphragms. The device can realize automatic equal-distance testing of diaphragms, and the test data can be automatically uploaded to the computer. The test data can effectively feedback the uniformity of the diaphragm permeability, while greatly improving the inspection efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a lithium battery diaphragm gas permeability automatic testing device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic testing device for the gas permeability of a lithium battery diaphragm, comprising a detection base and a permeability meter arranged on the detection base for performing a gas permeability test on a diaphragm sample, two sets of roller assemblies are also provided on the detection base, the roller assembly comprises a fixed platform arranged on the detection base and a base motor connected to the fixed platform, a pressure roller for limiting the position of the diaphragm sample is also installed on the fixed platform, and a reel component is detachably assembled at the output end of the base motor, and the reel component reels or unwinds the diaphragm sample when it rotates.

[0005] As a further solution of the present invention: a connecting platform is installed on the surface of the detection base on the roller assembly, the connecting platform is located between the two roller groups, and a permeability meter is fixed on the connecting platform.

[0006] As a further solution of the present invention: a control computer is installed on the detection base, and the control computer is connected to the air permeability instrument and the base motor respectively.

[0007] As a further solution of the present invention: an external thread is formed at the end of the base motor output end, and the external thread is connected to the internal thread groove formed at the end of the reel component, and the thread direction of the internal thread groove is opposite to the rotation direction of the base motor.

[0008] As a further solution of the present invention: the reel component includes a first power roller connected to the base motor through an internal thread groove, and a pin shaft hole for the pin shaft to pass through is formed at the end of the first power roller away from the internal thread groove, and the position of the diaphragm roll on the first power roller is restricted when the pin shaft is inserted.

[0009] As a further solution of the present invention: the winding drum component includes a second power roller connected to the base motor through an internal thread groove, and a through channel is formed on the second power roller for a movable pin to slide inside, and a tension spring is installed on the surface of the movable pin, which is located in the through channel and connected to the inner wall of the through channel.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The present application places the diaphragm between a reel component and a pressure roller, starts a control computer to control the permeability meter and a base motor, and the diaphragm is driven forward by the reel component and is transferred to the permeability meter via the pressure roller. The control computer simultaneously controls the permeability meter for testing. After the test, the diaphragm is transferred to another reel component via the pressure roller. The permeability values of the set distance positions are tested in sequence, and the test data is uploaded to the computer in real time. In this way, the entire testing process can eliminate the manual work of moving the diaphragm and recording the permeability data. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the automatic gas permeability testing device for lithium battery diaphragms of the present invention;

[0013] Figure 2 This is a schematic diagram of the reel component of the present utility model;

[0014] Figure 3 This is a schematic diagram of another embodiment of the reel component of the present invention;

[0015] Figure 4 This is a schematic diagram of the diaphragm roll of the present utility model;

[0016] Figure 5 This is a schematic diagram of the connection between the base motor and the second power roller of the utility model;

[0017] In the figure: 1. Testing base; 2. Connecting platform; 3. Breathing instrument; 4. Fixing platform; 5. First power roller; 6. Pin shaft; 7. Pressing roller; 8. Control computer; 9. Second power roller; 10. Through channel; 11. Internal thread groove; 12. Movable pin; 13. Tension spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-5 In an embodiment of the utility model, a lithium battery diaphragm automatic permeability testing device includes a detection base 1 and a permeability meter 3 provided on the detection base 1 for performing a permeability test on a diaphragm sample, which is mainly used to test the permeability of the diaphragm sample. Two sets of roller assemblies are also provided on the detection base 1. The roller assembly includes a fixed platform 4 provided on the detection base 1 and a base motor connected to the fixed platform 4. A pressure roller 7 for limiting the position of the diaphragm sample is also installed on the fixed platform 4. The pressure roller 7 is mainly used to adjust the flatness of the diaphragm sample. A reel component is detachably assembled at the output end of the base motor. When the reel component rotates, the diaphragm sample is wound or unwound.

[0020] Specifically, the two sets of roller assemblies have the same structure and can perform the same function, namely, winding or unwinding. During use, one set of roller assemblies performs unwinding, while the other performs winding. A control computer 8 is installed on the detection base 1. The control computer 8 is connected to the permeability tester 3 and the base motor, respectively. The control computer 8 controls the permeability tester 3 via a serial line to run the test according to a specified time pattern and record the test data. A reel component and a pressure roller 7 are installed on the left and right sides of the permeability tester 3 above the detection base 1. The reel component and the pressure roller 7 are driven by the base motor and controlled by the control computer 8. The control computer 8 controls the reel component and the pressure roller 7 to move the diaphragm and control the permeability tester 3. The test data is connected to the control computer 8 via a serial line and fed back to the control computer 8, thereby realizing automatic testing and uploading of the permeability data to the control computer 8. With this device, the membrane permeability test can be completed uniformly and accurately, and manual data entry can be eliminated, which greatly improves the uniformity and inspection efficiency of lithium battery membrane permeability testing.

[0021] See also Figure 1 In one embodiment, in this embodiment, preferably, a connecting platform 2 is installed on the surface of the detection base 1 on the roller assembly, and the connecting platform 2 is located between the two roller groups. A permeability meter 3 is fixed on the connecting platform 2. Furthermore, under the action of the connecting platform 2, the permeability meter 3 can be well fixed on the detection base 1.

[0022] See also Figure 1In one embodiment, in this embodiment, preferably, an external thread is formed at the end of the base motor output end, and the external thread is connected to the internal thread groove 11 formed at the end of the reel component. The thread direction of the internal thread groove 11 is opposite to the rotation direction of the base motor, which can effectively prevent the reel component from falling off the base motor when the base motor drives the reel component to rotate.

[0023] See also Figure 2 In one embodiment, in this embodiment, preferably, the reel component includes a first power roller 5 connected to the base motor through an internal thread groove 11, and a pin shaft hole for the pin shaft 6 to pass through is formed at the end of the first power roller 5 away from the internal thread groove 11. When the pin shaft 6 is inserted, the position of the diaphragm roll on the first power roller 5 is restricted.

[0024] Specifically, the diaphragm roll of corresponding size is first put on the outer circumference of the first power roller 5, and then the pin 6 is inserted into the pin hole. At this time, the pin 6 contacts the end face of the diaphragm roll, which plays a role in limiting the position of the diaphragm roll. Similarly, the diaphragm roll can be replaced by simply pulling the pin 6 out of the pin hole. Since the position of the pin hole is fixed, the first power roller 5 can only adapt to one size of diaphragm roll.

[0025] See also Figure 3 In another embodiment, in this embodiment, preferably, the reel component includes a second power roller 9 connected to the base motor through an internal thread groove 11, and a through channel 10 is formed on the second power roller 9 for a movable pin 12 to slide inside. The surface of the movable pin 12 is installed with a tension spring 13 located in the through channel 10 and connected to the inner wall of the through channel 10.

[0026] In order to better adapt to diaphragm rolls of different widths, during the assembly process, the second power roller 9 can be first unscrewed from the base motor, and then the diaphragm roll can be inserted from the end of the internal thread groove 11. At this time, the diaphragm roll squeezes the movable pin 12 along the through channel 10. When the diaphragm roll is completely covered with the second power roller 9, the second power roller 9 can be fixed to the end of the base motor. Although the replacement efficiency is lower than the previous embodiment, it can adapt to diaphragm rolls of various widths.

[0027] The same tester used the lithium battery membrane gas permeability automatic test device and the manual test device to test the same 3 rolls of membrane gas permeability samples. The test time comparison showed that the lithium battery membrane gas permeability automatic test device saved 30% of the test time compared with the manual test device. The test result feedback showed that in the equidistant test, the MSA measurement system analysis repeatability of the lithium battery membrane gas permeability automatic test device was better than that of the manual test device.

[0028] The working principle and usage process of this utility model are as follows: a membrane sample to be tested is placed between a first powered roller 5 and a second powered roller 9. The control computer 8 is activated to control the permeability tester 3 and the base motor. The membrane sample is driven forward by the first powered roller 5 or the second powered roller 9 and is transferred to the permeability tester 3 via the pressure roller 7. The control computer 8 simultaneously controls the permeability tester 3 for testing. After the test, the membrane sample is transferred to the first powered roller 5 or the second powered roller 9 via the pressure roller 7. The permeability values at the set distances are tested in sequence, and the test data is uploaded to the computer in real time. This eliminates the need for manual membrane movement and permeability data recording during the entire testing process.

[0029] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0030] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. A lithium battery diaphragm gas permeability automatic testing device, characterized in that: The invention comprises a detection base (1) and a permeability meter (3) arranged on the detection base (1) for performing a permeability test on a membrane sample. Two groups of roller assemblies are also arranged on the detection base (1). The roller assembly comprises a fixed platform (4) arranged on the detection base (1) and a base motor connected to the fixed platform (4). A pressure roller (7) for limiting the position of the membrane sample is also installed on the fixed platform (4). A reel component is detachably mounted on the output end of the base motor. When the reel component rotates, the membrane sample is rolled up or unrolled.

2. The automatic testing device for gas permeability of lithium battery diaphragms according to claim 1, characterized in that: The detection base (1) is located on the surface of the roller assembly and is provided with a connecting platform (2). The connecting platform (2) is located between the two roller groups, and a permeability meter (3) is fixed on the connecting platform (2).

3. The automatic testing device for gas permeability of lithium battery diaphragms according to claim 1, characterized in that: A control computer (8) is installed on the detection base (1), and the control computer (8) is connected to the permeability instrument (3) and the base motor respectively.

4. The automatic testing device for gas permeability of lithium battery diaphragms according to claim 1, characterized in that: An external thread is formed at the end of the base motor output end, and the external thread is connected to an internal thread groove (11) formed at the end of the reel component, and the thread direction of the internal thread groove (11) is opposite to the rotation direction of the base motor.

5. The automatic testing device for gas permeability of lithium battery diaphragm according to claim 4, characterized in that: The reel component includes a first power roller (5) connected to a base motor via an internal thread groove (11); a pin shaft hole for a pin shaft (6) to pass through is formed at the end of the first power roller (5) away from the internal thread groove (11); when the pin shaft (6) is inserted, the position of the diaphragm roll on the first power roller (5) is restricted.

6. The automatic testing device for gas permeability of lithium battery diaphragms according to claim 4, characterized in that: The reel component includes a second power roller (9) connected to the base motor through an internal thread groove (11), and a through channel (10) is formed on the second power roller (9) for a movable pin (12) to slide inside. A tension spring (13) is installed on the surface of the movable pin (12) and is located in the through channel (10) and connected to the inner wall of the through channel (10).

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