Device and method for detecting wettability of electrolyte

Abstract

The invention discloses a device and a method for detecting the wettability of an electrolyte. The detection device comprises a liquid injection tank, a test assembly used for straightening a sample strip is inserted into the liquid injection tank, a lifting assembly is arranged on the rear side of the liquid injection tank, a rotating assembly is arranged on the lifting assembly, a test line is horizontally arranged at the free end of the rotating assembly, and the surface of the test line is coated or soaked with water-sensitive color-changing ink. The detection method comprises the following steps: clamping a to-be-tested sample between the lifting and pulling block and the lower end of the test frame; the lower end of the test frame is inserted into the slot, and the to-be-tested sample is flattened and straightened; injecting electrolyte until the electrolyte submerges the lower end of the to-be-tested sample; after infiltration, the rotating arm is rotated until the test line is pressed on the upper end surface of the to-be-tested sample, the test line slowly sweeps the surface of the to-be-tested sample, and the infiltration performance of the electrolyte on different to-be-tested samples is judged according to the color changing sequence of the test line. The method can rapidly evaluate the infiltration performance of the pole piece and the diaphragm to the electrolyte, and has the advantages of simple operation and simple device.

Description

Technical Field

[0001] The present invention relates to a material wetting performance detection device and a detection method, and in particular to an electrolyte wetting performance detection device and a detection method. Background Art

[0002] The wettability of the electrode and the diaphragm to the electrolyte will affect the performance of the nickel-hydrogen battery. In order to evaluate the wettability of the electrode and the diaphragm to the electrolyte, Chinese patent CN116519546A discloses a detection device and method for the capillary wettability of the electrolyte, the detection device includes the electrolyte tank, the part to be wetted and two clamping plates. The electrolyte tank is used to hold the electrolyte. The two clamping plates are arranged relatively spaced apart to define a clamping space between the two clamping plates. One end of the two clamping plates is immersed in the electrolyte in the electrolyte tank. At least one clamping plate is set to a transparent material. The part to be wetted is arranged in the clamping space. The operator of the device records the height of the electrolyte rising in the part to be wetted in different time periods and finally calculates the relationship between the infiltration speed of the electrolyte after the start of infiltration and time and / or the height that has been wetted and / or the height to which the electrolyte finally climbs. During the test, the device needs to accurately measure the height of the electrolyte rising in the wetted part several times and record the wetted time accordingly. The test process is cumbersome, and the test workload is large when testing multiple wetted parts at the same time, and the efficiency is low. In addition, the method requires the operator to observe and measure the height of the electrolyte infiltration, which inevitably leads to human errors. The edges of the wetted area are often irregular and jagged. Different operators have different judgment standards for the wetted height, which will also lead to errors in the test results. Therefore, the device and method are not suitable for the simultaneous testing of large quantities of samples. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide an electrolyte wetting performance detection device to solve the problem that the existing detection device has large detection errors and cannot quickly and simultaneously detect multiple test pieces. Another purpose of the present invention is to propose a method for detecting electrolyte wetting performance to solve the problem of how to simultaneously evaluate the wettability of multiple pole pieces and diaphragm samples to the electrolyte.

[0004] Technical solution: The electrolyte infiltration performance detection device described in the present invention includes a liquid injection tank, in which a test component for straightening a sample strip is inserted, a lifting component is provided on the rear side of the liquid injection tank, a rotating component is provided on the lifting component, a test line is horizontally arranged on the free end of the rotating component, and the surface of the test line is coated or soaked with water-sensitive color-changing ink.

[0005] Preferably, a slot is provided in the middle of the liquid injection tank, and the test assembly includes a test frame with its lower end inserted into the slot, a lifting block is slidably connected to the inner side of the test frame, a second screw is rotatably connected between the upper and lower ends of the test frame, the lifting block is threadedly connected to the second screw, an upper strip clamp is provided on the lifting block, and a lower strip clamp is provided at the lower end of the test frame, and the sample to be tested is clamped between the upper strip clamp and the lower strip clamp.

[0006] Preferably, the upper end of the second screw rod passes through the test frame and is provided with a rotating handle.

[0007] Preferably, the lifting assembly includes a stand arranged on the rear side of the liquid injection tank, both sides of the stand are provided with through slots, a lifting block is slidably connected between the two through slots, both ends of the lifting block pass through the through slots and are symmetrically provided with two rotating arms, one end of the rotating arm is hinged with the lifting block damping, the test line is arranged between the other ends of the two rotating arms, and the stand is also provided with a driving assembly for driving the lifting block to rise and fall.

[0008] Preferably, the driving assembly includes a first screw rotatably connected between the upper and lower ends of the stand, the upgrade block is threadedly connected to the first screw, a motor is provided at the upper end of the stand, and the upper end of the first screw is connected to the output shaft of the motor.

[0009] The driving assembly is a pneumatic cylinder or an electric cylinder with a longitudinal stroke.

[0010] Preferably, the upper strip clamp is provided with an upper inserting strip, and the upper strip clamp is plugged into the lifting block through the upper inserting strip, and the lower strip clamp is provided with a lower inserting strip, and the lower strip clamp is plugged into the lower end of the test frame through the lower inserting strip.

[0011] The present invention further discloses a method for detecting the wettability of an electrolyte using the above device, comprising the following steps:

[0012] (1) Fix one end of the strip-shaped sample to be tested on the upper strip clamp and the other end on the lower strip clamp. Then, plug the upper strip clamp into the lifting block and plug the lower strip clamp into the lower end of the test frame.

[0013] (2) Insert the lower end of the test frame into the slot, rotate the second screw rod to raise the lifting block until the test sample is flattened and straightened, and stop rotating the lifting block;

[0014] (3) Injecting electrolyte into the injection tank until the electrolyte covers the lower end of the test sample, and waiting for the electrolyte to infiltrate upward along the test sample to overcome gravity;

[0015] (4) After wetting, remove the electrolyte in the injection tank, rotate the rotating arm until the test line is crimped on the upper surface of the sample to be tested, and then slowly move the lifting block and the rotating arm downward. The rotating arm drives the test line to scan the surface of the sample to be tested from top to bottom, and record the order in which different samples to be tested cause the test line to change color. According to the order of color change, the wetting performance of the electrolyte on different samples to be tested is judged.

[0016] Preferably, in step (1), different samples to be tested are kept parallel and not in contact with each other.

[0017] Preferably, in step (4), the test line is kept in close contact with the surface of the sample to be tested when sweeping downward.

[0018] In some embodiments, the sample to be tested is a pole piece and / or a diaphragm.

[0019] After the electrolyte is injected into the injection tank, the electrolyte infiltrates the electrode or diaphragm on the test component, and the irregular boundary between the wetted area and the non-wetted dry area of ​​the electrode or diaphragm can be observed with the naked eye. The electrolyte can overcome gravity and climb upward under the influence of capillary force, causing the infiltration boundary to climb upward along the electrode or diaphragm over time. By comparing the boundary heights of electrolyte infiltration in the same time period, the wettability of different electrodes or diaphragms to the electrolyte is compared. Or it can be evaluated by recording the time required for the same infiltration height. It is also possible to use the same electrode or diaphragm and evaluate the wettability of electrolytes of different formulations on the electrode or diaphragm by injecting electrolytes of different formulations.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0021] The present invention can quickly evaluate the wettability of the electrode and the diaphragm to the electrolyte, and has the advantages of simple operation and simple device. The present invention uses the same test line to detect the infiltration limit, unifies the judgment standard, and reduces human error. The present invention can also detect multiple samples at the same time, and flexibly judge and compare the electrolyte infiltration performance of multiple samples according to the color change sequence, color change time or color change position of the detection line, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a front view of the present invention;

[0024] Figure 3 A top view of the present invention;

[0025] Figure 4 for Figure 3 Middle AA section view;

[0026] Figure 5 It is a schematic diagram of the structure of the liquid injection tank and the stand;

[0027] 1-liquid injection tank, 11-slot, 2-stand, 21-rotating arm, 22-lifting block, 23-first screw, 24-motor, 25-through slot, 3-test frame, 31-second screw, 32-lifting block, 33-rotating handle, 4-upper bar clamp, 41-lower bar clamp, 5-sample to be tested, 6-test line, 7-upper insert, 71-lower insert. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0029] like Figure 1-5 As shown, an electrolyte wetting performance detection device includes a liquid injection tank 1, a slot 11 is provided in the middle of the liquid injection tank 1, a test assembly is inserted in the slot 11, and the test assembly includes a test frame 3 whose lower end is inserted in the slot 11, a lifting block 32 is slidably connected to the inner side of the test frame 3, a second screw 31 is rotatably connected between the upper and lower ends of the test frame 3, the lifting block 32 is threadedly connected to the second screw 31, and the upper end of the second screw 31 passes through the test frame 3 and is provided with a handle 33. An upper strip clamp 4 is provided on the lifting block 32, and a lower strip clamp 41 is provided at the lower end of the test frame 3, and a sample 5 to be tested is clamped between the upper strip clamp 4 and the lower strip clamp 41.

[0030] In this embodiment, a lifting assembly is provided at the rear side of the injection tank 1, and the lifting assembly includes a stand 2 provided at the rear side of the injection tank 1, and through slots 25 are provided on both sides of the stand 2, and a lifting block 22 is slidably connected between the two through slots 25, and two ends of the lifting block 22 pass through the through slots 25 and are symmetrically provided with two rotating arms 21, one end of the rotating arm 21 is damping hinged with the lifting block 22, and a straight test line 6 is provided between the other ends of the two rotating arms 21, and the test line 6 is perpendicular to the sample 5 to be tested, and the surface of the test line 6 is coated or soaked with water-sensitive color-changing ink. The stand 2 is also provided with a driving assembly for driving the lifting block 22 to rise and fall, and the driving assembly includes a first screw 23 rotatably connected between the upper and lower ends of the stand 2, and the upgrade block is threadedly connected to the first screw 23, and a motor 24 is provided at the upper end of the stand 2, and the upper end of the first screw 23 is connected to the output shaft of the motor 24. The driving assembly can be replaced as a whole with a cylinder or electric cylinder with a longitudinal stroke.

[0031] In this embodiment, the sample to be tested 5 is arranged vertically, the test line 6 is arranged horizontally, and one end of the rotating arm 21 is rotatably connected to the lifting block 22 through a damping hinge. The damping hinge can help the test line 6 to fit closely to the surface of the sample to be tested 5 to prevent the test line 6 from breaking contact with the sample to be tested 5 when the test line 6 sweeps downward. The spacing between the two rotating arms 21 should be greater than the width of the test frame 3. Water-sensitive color-changing ink is an ink that changes color when it comes into contact with water or other liquids. Transparent color-changing ink, colorless color-changing ink, red-to-blue ink or blue-to-red ink, water-fading ink, etc. can be conventionally selected. The test assembly can adjust the lifting height of the lifting block 32 according to the length of the sample to be tested 5 to keep the sample to be tested 5 in a straight state.

[0032] In this embodiment, the upper bar clamp 4 is provided with an upper inserting strip 7, and the upper bar clamp 4 is plugged into the lifting block 32 through the upper inserting strip 7, and the lower bar clamp 41 is provided with a lower inserting strip 71, and the lower bar clamp 41 is plugged into the lower end of the test frame 3 through the lower inserting strip 71. The detachable design of the upper bar clamp 4 and the lower bar clamp 41 can not only facilitate the clamping and parallel alignment of the samples 5 to be tested, but also can clamp the next batch of samples 5 to be tested while testing the current batch, thereby reducing the time for replacing the samples 5 to be tested.

[0033] The method for detecting the electrolyte wetting performance using the above device is as follows:

[0034] (1) Cut the electrode or diaphragm into strips as the test sample 5, clamp one end of the test sample 5 on the upper strip clamp 4, and clamp the other end on the lower strip clamp 41, so that different test samples 5 are kept parallel and do not touch each other. Then, plug the upper strip clamp 4 on the lifting block 32 through the upper insert 7, and plug the lower strip clamp 41 on the lower end of the test frame 3 through the lower insert 71;

[0035] (2) Insert the lower end of the test frame 3 into the slot 11, rotate the second screw 31, and raise the lifting block 32 until the test sample 5 is flattened and straightened, and stop rotating the lifting block 32;

[0036] (3) injecting electrolyte into the injection tank 1 until the electrolyte covers the lower end of the test sample 5, and waiting for the electrolyte to infiltrate upward along the test sample 5 to overcome gravity;

[0037] (4) After the immersion, the electrolyte in the injection tank 1 is removed, and the rotating arm 21 is rotated until the test line 6 is crimped on the upper surface of the sample 5 to be tested. Then, the lifting block 22 and the rotating arm 21 are slowly moved downward. The rotating arm 21 drives the test line 6 to scan the surface of the sample 5 to be tested from top to bottom. The test line 6 remains in close contact with the surface of the sample 5 to be tested when scanning downward.

[0038] (5) Record the order in which different samples 5 to be tested change the color of the test line 6, and judge the wetting performance of the electrolyte on different samples 5 to be tested according to the order of color change. The sample 5 to be tested whose test line 6 changes color first has better wetting performance, and vice versa. In addition, the wetting height can be known according to the distance between the position of the test line 6 when it just changes color and the lower strip clamp 41. The position of the test line 6 can also be fixed, and the time when the test line 6 on different samples 5 to be tested just changes color is recorded. The shorter the time, the faster the wetting speed and the better the wetting performance.

[0039] (6) After the test, lift the rotating arm 21, pull out the upper insert 7 and the lower insert 71 to remove the sample 5 to be tested, insert the next batch of samples 5 to be tested, replace and press the test line 6 to continuously monitor.

Claims

1. An electrolyte wetting performance detection device, characterized in that: The invention comprises a liquid injection groove (1), wherein a test assembly for straightening a sample strip is inserted into the liquid injection groove (1), a lifting assembly is arranged at the rear side of the liquid injection groove (1), a rotating assembly is arranged on the lifting assembly, a test line (6) is arranged horizontally on the free end of the rotating assembly, and the surface of the test line (6) is coated or soaked with water-sensitive color-changing ink.

2. The electrolyte wetting performance detection device according to claim 1, characterized in that: A slot (11) is provided in the middle of the injection tank (1), and the test assembly comprises a test frame (3) whose lower end is inserted into the slot (11); a lifting block (32) is slidably connected to the inner side of the test frame (3); a second screw rod (31) is rotatably connected between the upper and lower ends of the test frame (3); the lifting block (32) is threadedly connected to the second screw rod (31); an upper strip clamp (4) is provided on the lifting block (32); a lower strip clamp (41) is provided at the lower end of the test frame (3); a sample (5) to be tested is clamped between the upper strip clamp (4) and the lower strip clamp (41).

3. The electrolyte wetting performance detection device according to claim 2, characterized in that: The upper end of the second screw rod (31) passes through the test frame (3) and is provided with a rotating handle (33).

4. The electrolyte wetting performance detection device according to claim 1, characterized in that: The lifting assembly comprises a stand (2) arranged at the rear side of the liquid injection tank (1), both sides of the stand (2) are provided with through slots (25), a lifting block (22) is slidably connected between the two through slots (25), two ends of the lifting block (22) pass through the through slots (25) and are symmetrically provided with two rotating arms (21), one end of the rotating arm (21) is damping-hinged with the lifting block (22), the test line (6) is arranged between the other ends of the two rotating arms (21), and a driving assembly for driving the lifting block (22) to rise and fall is also provided on the stand (2).

5. The electrolyte wetting performance detection device according to claim 4, characterized in that: The driving assembly comprises a first screw rod (23) rotatably connected between the upper and lower ends of the stand (2), the upgrade block is threadedly connected to the first screw rod (23), a motor (24) is provided at the upper end of the stand (2), and the upper end of the first screw rod (23) is connected to the output shaft of the motor (24).

6. The electrolyte wetting performance detection device according to claim 4, characterized in that: The driving assembly is a pneumatic cylinder or an electric cylinder with a longitudinal stroke.

7. The electrolyte wetting performance detection device according to claim 2, characterized in that: The upper strip clamp (4) is provided with an upper inserting strip (7), and the upper strip clamp (4) is plugged into the lifting block (32) via the upper inserting strip (7); the lower strip clamp (41) is provided with a lower inserting strip (71), and the lower strip clamp (41) is plugged into the lower end of the test frame (3) via the lower inserting strip (71).

8. A method for detecting the wettability of an electrolyte using the device according to any one of claims 1 to 7, characterized in that: The steps include: (1) Fix one end of the strip-shaped sample to be tested on the upper strip clamp and the other end on the lower strip clamp. Then, plug the upper strip clamp into the lifting block and plug the lower strip clamp into the lower end of the test frame. (2) Insert the lower end of the test frame into the slot, rotate the second screw rod to raise the lifting block until the test sample is flattened and straightened, and stop rotating the lifting block; (3) Injecting electrolyte into the injection tank until the electrolyte covers the lower end of the test sample, and waiting for the electrolyte to infiltrate upward along the test sample to overcome gravity; (4) After wetting, remove the electrolyte in the injection tank, rotate the rotating arm until the test line is crimped on the upper surface of the sample to be tested, and then slowly move the lifting block and the rotating arm downward. The rotating arm drives the test line to scan the surface of the sample to be tested from top to bottom, and record the order in which different samples to be tested cause the test line to change color. According to the order of color change, the wetting performance of the electrolyte on different samples to be tested is judged.

9. The method for detecting the wettability of electrolyte according to claim 8, characterized in that: In step (1), different samples to be tested are kept parallel and not in contact with each other.

10. The method for detecting the wettability of electrolyte according to claim 8, characterized in that: In step (4), the test line is kept in close contact with the surface of the sample to be tested during the downward sweep.

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