A device for testing the liquid absorption rate of a lithium battery separator

Abstract

The application discloses a kind of lithium battery diaphragm liquid absorption rate test device, it includes test box, detection component and drying component, test box includes box and box door, one side of box is open, box door is rotationally arranged at the opening of box, sliding plate is slidably arranged in box, detection component is arranged in box, detection component includes detection cylinder, support frame, connecting clamp, detection cylinder is provided with several on sliding plate, support frame is vertically arranged on sliding plate, connecting clamp is provided with several on support frame, several connecting clamps and several detection cylinders are vertically arranged one by one, drying component includes heating plate, and heating plate is arranged on the inner wall of box.The application has the effect of improving the detection accuracy and efficiency of liquid absorption rate.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery separator production, and in particular to a lithium battery separator liquid absorption rate testing device. Background Technology

[0002] The separator is an inner component of a lithium-ion battery, and it is one of the key internal components in the battery's structure. The performance of the separator determines the battery's interface structure, internal resistance, and other characteristics, directly affecting the battery's capacity, cycle life, and safety performance. A high-performance separator plays a crucial role in improving the overall performance of the battery. The main function of the separator is to separate the positive and negative electrodes, preventing short circuits caused by contact between the electrodes. It also allows electrolyte ions to pass through. For lithium-ion batteries, since the electrolyte is an organic solvent system, separator materials resistant to organic solvents are required. High-strength, thin-film polyolefin porous membranes are generally used.

[0003] Currently, in order to detect the liquid absorption rate of lithium battery separators, one end of the separator is usually placed in the test liquid, and the liquid height of the test liquid on the separator is calculated over a certain period of time, thereby calculating the amount of liquid absorbed by the separator.

[0004] Regarding the aforementioned technologies, the inventors believe that during the detection of liquid absorption rate using the lithium battery separator, as the test liquid rises on the separator, the liquid level in the test liquid placement tube decreases, leading to a reduction in the contact area between the test liquid and the separator, thus affecting the liquid absorption rate. Furthermore, a humid environment within the testing chamber also affects the liquid absorption rate of the separator, resulting in a decrease in the accuracy of the liquid absorption rate detection. Utility Model Content

[0005] To improve the accuracy and efficiency of liquid absorption rate detection, this application provides a lithium battery separator liquid absorption rate testing device.

[0006] The lithium battery separator liquid absorption rate testing device provided in this application adopts the following technical solution: A lithium battery separator liquid absorption rate testing device includes a test chamber, a detection component, and a drying component. The test chamber includes a chamber body and a door. One side of the chamber body is open, and the door is rotatably disposed at the opening of the chamber body. A sliding plate is slidably disposed in the chamber body. The detection component is disposed in the chamber body and includes a detection cylinder, a support frame, and connecting clamps. Several detection cylinders are disposed on the sliding plate, the support frame is vertically disposed on the sliding plate, and several connecting clamps are disposed on the support frame. Several connecting clamps are vertically corresponding to several detection cylinders. The drying component includes a heating plate disposed on the inner wall of the chamber body.

[0007] By adopting the above technical solution, before detecting the liquid absorption rate of the separator, the heating plate is activated to heat and dry the inside of the chamber, reducing the impact of the humid environment on the liquid absorption rate of the separator. Multiple lithium battery separators are clamped one by one onto the connecting clamp, and an appropriate amount of test solution is injected into the corresponding detection cylinder. The test solution is absorbed by the separator, and the liquid absorption line on the separator gradually rises. The liquid absorption rate of the separator is observed by measuring the distance the liquid absorption line rises over a certain period of time. The setting of multiple detection cylinders allows for simultaneous comparison and observation of the liquid absorption rates of multiple lithium battery separators with the same test solution, which helps to improve the detection rate of the liquid absorption rate of lithium battery separators. Through the cooperation of the test chamber, detection components, and drying components, simultaneous and accurate detection of multiple sets of samples is achieved, improving the accuracy and efficiency of liquid absorption rate detection.

[0008] Optionally, the detection assembly further includes a storage cylinder, a liquid storage bag, an infusion tube, and a squeezing plate. Several storage cylinders are arranged on the sliding plate, and each storage cylinder corresponds to one of the detection cylinders. One liquid storage bag is provided in each storage cylinder. The squeezing plate is slidably disposed in the storage cylinder and abuts against the liquid storage bag. A first driving member is provided on the storage cylinder for driving the squeezing plate to move. The infusion tube is connected between the bottom end of the liquid storage bag and the detection cylinder.

[0009] By adopting the above technical solution, as the test liquid extends on the diaphragm, the liquid level in the detection cylinder gradually decreases. At this time, the squeezing plate moves downward under the drive of the first driving component, squeezing the storage bag. The liquid in the storage bag enters the detection cylinder through the infusion tube, thus replenishing the liquid in the detection cylinder. This ensures that the contact area between the test liquid and the diaphragm remains constant during the detection process, which helps to improve the detection accuracy of the device.

[0010] Optionally, a liquid level sensor is provided in the inner wall of the detection cylinder, and the liquid level sensor is electrically connected to the corresponding first driving component.

[0011] By adopting the above technical solution, the liquid level sensor detects the liquid level in the detection cylinder. When the liquid level in the detection cylinder drops below the liquid level sensor, the first driving component drives the squeezing plate to squeeze the storage bag until the liquid level in the detection cylinder submerges the liquid level sensor again, thus realizing timely replenishment of the detection cylinder.

[0012] Optionally, the detection cylinder is provided with a connecting assembly, which includes a connecting strip, a sliding block, a connecting rack, a connecting rod, and a pull block. The connecting strip is vertically disposed on the inner wall of the detection cylinder, the sliding block is slidably disposed on the connecting strip, the liquid level sensor is connected to the sliding block, the connecting rack is disposed on one side of the connecting strip, the sliding block has a sliding hole, the connecting rod is slidably inserted into the sliding hole, one end of the connecting rod is positioned corresponding to the connecting rack, and the pull block is connected to the end of the connecting rod away from the connecting rack.

[0013] By adopting the above technical solution, when different amounts of test liquid need to be injected into the detection cylinder, the height of the liquid level sensor in the detection cylinder needs to be adjusted. The sliding block is slid to the appropriate position of the connecting strip, and the connecting rod is pushed. The end of the connecting rod engages in the corresponding recess of the connecting rack, thus limiting the position of the sliding block.

[0014] Optionally, the support frame includes a support crossbar, a support slide bar, and a support sleeve bar. Two support sleeve bars are vertically arranged on the sliding plate. One support slide bar is slidably arranged in each of the support sleeve bars. The support crossbar is horizontally connected to the top ends of the corresponding two support slide bars. The connecting clamp is arranged on the support crossbar. The support sleeve bar is provided with a second driving member for driving the support slide bars to slide in the vertical direction.

[0015] By adopting the above technical solution, the clamping height of the diaphragm needs to be adjusted to meet different experimental requirements. The second driving component drives the support slide rod to slide within the support sleeve, thereby achieving height adjustment of the support crossbar.

[0016] Optionally, a back plate is vertically connected to the side of the sliding plate away from the door. The back plate has several scale lines arranged along the vertical direction, and the scale lines correspond one-to-one with several detection cylinders. The detection cylinders are made of transparent material.

[0017] By adopting the above technical solution, after the lithium battery separator has undergone liquid absorption for a period of time, the liquid absorption height on the lithium battery separator can be observed through a transparent detection tube and the scale lines on the back plate.

[0018] Optionally, the drying assembly further includes an exhaust fan, an exhaust duct, an air supply duct, and a ventilation box. The exhaust fan is mounted on the box body. One end of the air supply duct is connected to the exhaust fan, and the other end extends into the box body. Several exhaust ducts are connected to the air supply duct. The ventilation box is connected to the vertical side wall of the box body. The side of the ventilation box away from the box body is open and has a rotatable opening and closing plate.

[0019] By employing the above technical solution, while the heating plate heats the gas inside the chamber, moisture evaporates and rises to the top of the chamber. The exhaust fan starts, the hinged panel opens, and the humid gas is blown out of the chamber through the air supply pipes and several exhaust pipes, further reducing the humidity inside the chamber. After dehumidification is complete, the hinged panel closes, isolating the internal environment of the chamber from the external environment.

[0020] Optionally, a humidity sensor is installed in the housing, and the humidity sensor is electrically connected to the exhaust fan.

[0021] By adopting the above technical solution, the humidity sensor detects the humidity in the chamber in real time. When the humidity in the chamber exceeds a certain threshold, the exhaust fan is started to ventilate and dehumidify the inside of the chamber.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the test chamber, detection components and drying components, the simultaneous and accurate detection of multiple sets of samples is achieved, which can improve the accuracy and efficiency of liquid absorption rate detection; 2. The scale markings make it easier for operators to observe the liquid absorption height on the lithium battery separator; 3. The drying component reduces the impact of a humid environment on the diaphragm's liquid absorption rate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the structure of a lithium battery separator liquid absorption rate testing device according to an embodiment of this application.

[0024] Figure 2 This is a partial sectional view used in the embodiments of this application to illustrate the internal structure of the box.

[0025] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0026] Explanation of reference numerals in the attached drawings: 1. Test chamber; 101. Chamber body; 102. Chamber door; 103. Viewing window; 104. Slide rail; 2. Detection assembly; 21. Detection cylinder; 22. Storage cylinder; 23. Liquid storage bag; 24. Infusion tube; 25. Infusion valve; 26. Squeezing plate; 27. Squeezing cylinder; 28. Support frame; 281. Support crossbar; 282. Support sleeve rod; 283. Support slide rod; 284. Lifting cylinder; 29. ​​Connecting clamp; 3. Connecting assembly; 1. Connecting bar; 32. Sliding block; 321. Connecting groove; 33. Connecting rod; 34. Connecting rack; 35. Connecting tension spring; 36. Pull block; 37. Liquid level sensor; 4. Drying assembly; 41. Exhaust fan; 42. Exhaust duct; 43. Air supply duct; 44. Heating plate; 45. Humidity sensor; 5. Sliding plate; 6. Back plate; 61. Scale line; 7. Ventilation box; 8. Opening and closing plate; 9. Filter plate; 10. Opening and closing cylinder; 11. Support plate. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-3 This application will be further described in detail below. Embodiments of this application provide a lithium battery separator liquid absorption rate testing device, which improves the accuracy and efficiency of liquid absorption rate detection.

[0028] Reference Figure 1 and Figure 2 A lithium battery separator liquid absorption rate testing device includes a test chamber 1, a detection component 2, a connecting component 3, and a drying component 4. The test chamber includes a chamber body 101 and a door 102. One side of the chamber body 101 is open, and the door 102 is rotatably connected to the opening of the chamber body 101. The door 102 is provided with a viewing window 103 for observation. Two slide rails 104 are connected in parallel on the inner bottom wall of the chamber body 101, and a sliding plate 5 is provided in the chamber body 101, which is slidably connected to the slide rails 104.

[0029] Reference Figure 1 and Figure 2The detection component 2 is housed in the housing 101. The detection component 2 includes a detection cylinder 21, a storage cylinder 22, a liquid storage bag 23, an infusion tube 24, an infusion valve 25, a squeezing plate 26, a squeezing cylinder 27, a support frame 28, and a connecting clamp 29. Several detection cylinders 21 and storage cylinders 22 are arranged on the top surface of the sliding plate 5, with each detection cylinder 21 corresponding to one of the storage cylinders 22. One liquid storage bag 23 is provided in each storage cylinder 22. The squeezing plate 26 is slidably disposed in the storage cylinder 22 and located above the liquid storage bag 23. A support plate 11 is provided at the top of the storage cylinder 22, and the squeezing cylinder 27 is connected to the support plate 11. The output shaft of the squeezing cylinder 27 extends vertically downward and is connected to the squeezing plate 26. One end of the infusion tube 24 is connected to the bottom end of the detection cylinder 21, and the other end extends into the storage cylinder 22 and communicates with the liquid storage bag 23. The infusion valve 25 is disposed on the infusion tube 24.

[0030] Reference Figure 1 A support frame 28 is disposed on the top surface of the sliding plate 5. The support frame 28 includes a support crossbar 281, a support sleeve 282, and a support slide bar 283. Two support sleeves 282 are vertically connected to the top surface of the sliding plate 5, and one support slide bar 283 is slidably connected to each support sleeve 282. The support crossbar 281 is horizontally connected between the top ends of the two support slide bars 283. Each support sleeve 282 is provided with a lifting cylinder 284, and the output shaft of the lifting cylinder 284 extends vertically upward and is connected to the support crossbar 281 for transmission. Several connecting clips 29 are provided on the support crossbar 281, and the several connecting clips 29 are vertically corresponding to several detection cylinders 21. A back plate 6 is vertically connected to the side of the sliding plate 5 away from the door 102. Several scale lines 61 are set vertically on the side of the back plate 6 near the door 102. The scale lines 61 are set one-to-one with several detection cylinders 21.

[0031] Reference Figure 2 and Figure 3Each detection cylinder 21 has a set of connecting components 3. The connecting components 3 include a connecting bar 31, a sliding block 32, a connecting rod 33, a connecting rack 34, a connecting tension spring 35, a pull block 36, and a liquid level sensor 37. The connecting bar 31 is vertically connected to the inner wall of the detection cylinder 21, and the connecting rack 34 is vertically connected to the connecting bar 31. The sliding block 32 is slidably connected to the connecting bar 31 and has a connecting groove 321 for sliding connection with the connecting bar 31. The liquid level sensor 37 is connected to the sliding block 32 and is electrically connected to the extrusion cylinder 27. The connecting rod 33 is horizontally slidably connected to the sliding block 32. The sliding block 32 has a sliding hole, and one end of the connecting rod 33 extends through the sliding hole into the connecting groove 321 and contacts the connecting rack 34. One end of the connecting rod 33, located outside the connecting groove 321, is connected to the pull block 36. A connecting spring 35 is sleeved on the connecting rod 33, with one end connected to the sliding block 32 and the other end connected to the pull block 36. In its natural state, one end of the connecting rod 33 abuts against the connecting rack 34 under the action of the connecting spring 35.

[0032] Reference Figure 1 and Figure 2 The drying assembly 4 includes an exhaust fan 41, an exhaust duct 42, an air supply duct 43, a heating plate 44, and a humidity sensor 45. A ventilation box 7 is connected to the side of the housing 101 away from the door 102. The ventilation box 7 is open on the side away from the housing 101, and an opening / closing plate 8 is rotatably connected to the open end of the ventilation box 7. A filter plate 9 is installed on the open end of the ventilation box 7. An opening / closing cylinder 10 is installed on the vertical side wall of the ventilation box 7. The cylinder body of the opening / closing cylinder 10 is rotatably connected to the side wall of the ventilation box 7, and the output shaft of the opening / closing cylinder 10 is rotatably connected to the opening / closing plate 8.

[0033] Reference Figure 1 and Figure 2 An exhaust fan 41 is installed on the top surface of the housing 101. One end of an air supply pipe 43 is connected to the exhaust fan 41, and the air supply pipe 43 extends into the housing 101. Several exhaust pipes 42 are connected in the air supply pipes 43, and the open end of the exhaust pipes 42 faces the ventilation box 7. A heating plate 44 is connected to the inner wall of the housing 101, and a humidity sensor 45 is connected to the inner wall of the housing 101. The humidity sensor 45 is electrically connected to the heating plate 44 and the exhaust fan 41.

[0034] Reference Figure 1 and Figure 2When the diaphragm liquid absorption rate is detected, the heating plate 44 is activated, and the interior of the chamber 101 is heated and dried. Simultaneously, the exhaust fan 41 is activated, and airflow enters the chamber 101 through the air supply pipe 43 and several exhaust pipes 42. The opening and closing cylinder 10 is activated, driving the opening and closing plate 8 to rotate, and the humid gas is discharged through the exhaust box. The humidity sensor 45 detects the humidity in the chamber 101. When the humidity drops to a suitable threshold, the opening and closing plate 8 closes, and the heating plate 44 stops heating the chamber 101. The drying component 4 helps to reduce the impact of a humid environment on the diaphragm liquid absorption rate.

[0035] Reference Figure 2 and Figure 3 Pulling the pull block 36 outwards separates the end of the connecting rod 33 from the connecting rack 34. For different liquid injection requirements, slide the sliding block 32 to a specific height, release the pull block 36, and the end of the connecting rod 33, under the action of the connecting spring 35, engages with the connecting rack 34, thus fixing the sliding block 32. A certain amount of test liquid is injected into the detection cylinder 21, and the lithium battery separator to be tested is clamped onto the connecting clamp 29, with the bottom end of the separator immersed in the test liquid. After a period of liquid absorption, the liquid absorption line on the separator gradually rises, and the operator can measure the liquid absorption height through the scale line 61 on the back plate 6. The multiple detection cylinders 21 facilitate the simultaneous detection and comparison of the liquid absorption rates of various lithium battery separators.

[0036] Reference Figure 2 As the liquid aspiration process proceeds, the liquid level in the detection cylinder 21 drops. At this point, the liquid level sensor 37 detects the drop and activates the squeezing cylinder 27, causing the squeezing plate 26 to descend. The squeezing plate 26 squeezes the storage bag 23, forcing the test liquid from the storage bag 23 into the detection cylinder 21. This timely replenishment of the test liquid reduces the impact on the diaphragm's liquid aspiration rate as the liquid level in the detection cylinder 21 decreases and the contact area between the diaphragm and the test liquid shrinks, thus improving the accuracy of the liquid aspiration rate detection.

[0037] The implementation principle of the lithium battery separator liquid absorption rate testing device in this embodiment is as follows: When testing the liquid absorption rate of the separator, the heating plate 44 is activated, and the interior of the housing 101 is heated and dried. Test liquid is injected into the testing cylinder 21, and the lithium battery separator to be tested is clamped onto the connecting clamp 29. After a period of liquid absorption, the operator measures the liquid absorption height. The arrangement of multiple testing cylinders 21 facilitates the simultaneous testing and comparison of the liquid absorption rates of multiple separators. When the liquid level in the testing cylinder 21 drops, the test liquid in the storage bag 23 is squeezed into the testing cylinder 21, achieving timely replenishment of the test liquid.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lithium battery separator liquid absorption rate testing device, characterized in that: The assembly includes a test chamber (1), a detection component (2), and a drying component (4). The test chamber (1) includes a chamber body (101) and a door (102). One side of the chamber body (101) is open. The door (102) is rotatably disposed at the opening of the chamber body (101). A sliding plate (5) is slidably disposed in the chamber body (101). The detection component (2) is disposed in the chamber body (101). The detection component (2) includes a detection cylinder (21) and a support frame (28). The connecting clips (29) are provided on the sliding plate (5), and the detection cylinders (21) are provided in a plurality of them. The support frame (28) is vertically arranged on the sliding plate (5). The connecting clips (29) are provided on the support frame (28). The plurality of connecting clips (29) and the plurality of detection cylinders (21) are arranged in a vertical direction in a corresponding manner. The drying component (4) includes a heating plate (44), which is arranged on the inner wall of the box (101).

2. The lithium battery separator liquid absorption rate testing device according to claim 1, characterized in that: The detection component (2) further includes a storage cylinder (22), a liquid storage bag (23), an infusion tube (24), and a squeezing plate (26). Several storage cylinders (22) are provided on the sliding plate (5), and several storage cylinders (22) are provided in a one-to-one correspondence with several detection cylinders (21). One liquid storage bag (23) is provided in each storage cylinder (22). The squeezing plate (26) is slidably disposed in the storage cylinder (22) and abuts against the liquid storage bag (23). A first driving member for driving the squeezing plate (26) to move is provided on the storage cylinder (22). The infusion tube (24) is connected between the bottom end of the liquid storage bag (23) and the detection cylinder (21).

3. The lithium battery separator liquid absorption rate testing device according to claim 2, characterized in that: A liquid level sensor (37) is provided in the inner wall of the detection cylinder (21), and the liquid level sensor (37) is electrically connected to the corresponding first driving component.

4. The lithium battery separator liquid absorption rate testing device according to claim 3, characterized in that: The detection cylinder (21) is provided with a connecting assembly (3), which includes a connecting strip (31), a sliding block (32), a connecting rack (34), a connecting rod (33), and a pull block (36). The connecting strip (31) is vertically arranged on the inner wall of the detection cylinder (21). The sliding block (32) is slidably arranged on the connecting strip (31). The liquid level sensor (37) is connected to the sliding block (32). The connecting rack (34) is arranged on one side of the connecting strip (31). A sliding hole is provided on the sliding block (32). The connecting rod (33) is slidably inserted into the sliding hole. One end of the connecting rod (33) is positioned corresponding to the position of the connecting rack (34). The pull block (36) is connected to the end of the connecting rod (33) away from the connecting rack (34).

5. The lithium battery separator liquid absorption rate testing device according to claim 1, characterized in that: The support frame (28) includes a support crossbar (281), a support slide bar (283), and a support sleeve bar (282). Two support sleeve bars (282) are vertically arranged on the sliding plate (5). One support slide bar (283) is slidably arranged in each of the support sleeve bars (282). The support crossbar (281) is horizontally connected to the top of the corresponding two support slide bars (283). The connecting clip (29) is arranged on the support crossbar (281). The support sleeve bar (282) is provided with a second driving member for driving the support slide bar (283) to slide in the vertical direction.

6. The lithium battery separator liquid absorption rate testing device according to claim 1, characterized in that: The sliding plate (5) is vertically connected to a back plate (6) on the side away from the box door (102). The back plate (6) has several scale lines (61) arranged along the vertical direction. The scale lines (61) correspond one-to-one with the detection cylinders (21). The detection cylinders (21) are made of transparent material.

7. The lithium battery separator liquid absorption rate testing device according to claim 1, characterized in that: The drying assembly (4) also includes an exhaust fan (41), an exhaust pipe (42), an air supply pipe (43), and a ventilation box (7). The exhaust fan (41) is mounted on the box body (101). One end of the air supply pipe (43) is connected to the exhaust fan (41), and the other end extends into the box body (101). Several exhaust pipes (42) are connected to the air supply pipe (43). The ventilation box (7) is connected to the vertical side wall of the box body (101). The ventilation box (7) is open on the side away from the box body (101) and has a rotating opening and closing plate (8).

8. The lithium battery separator liquid absorption rate testing device according to claim 7, characterized in that: A humidity sensor (45) is installed in the housing (101), and the humidity sensor (45) is electrically connected to the exhaust fan (41).

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