Colloid swelling ratio testing equipment

Abstract

The utility model provides colloid swelling rate testing equipment. The colloid swelling rate testing equipment comprises a transition column, a grating ruler displacement sensor, a probe, a sample mold and a power mechanism, the grating ruler displacement sensor is arranged on the side wall of the transition column; the bottom end of the transition column is connected with the probe; the sample mold is positioned below the probe and is used for containing to-be-detected colloid soaked with electrolyte; the transition column is connected with the power mechanism, and the power mechanism is used for driving the probe connected with the transition column to extrude the to-be-detected colloid soaked with the electrolyte. According to the colloid swelling rate testing equipment provided by the utility model, the application scene that colloid is soaked in electrolyte can be reduced, and the most real swelling of the colloid can be tested, so that the swelling rate testing result is more accurate, and the error is smaller.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field relates to a colloid swelling rate test equipment. BACKGROUND

[0002] In the use process of lithium battery, the colloid swelling rate in the rubberized diaphragm cannot be too large, otherwise it will cause the colloid structure to soften excessively or even the molecular structure to be damaged, hinder the migration of lithium ions in the diaphragm, and further cause the capacity attenuation of the battery. Therefore, the colloid swelling rate needs to be tested, and the colloid suitable for the rubberized diaphragm is selected.

[0003] CN116793888A uses mass method to test the colloid swelling rate, the sample is placed and dried in the fume hood after filtration, and the mass of the filter paper is weighed to calculate the swelling rate, but the residual electrolyte will cause large result error.

[0004] Therefore, how to improve the test accuracy of the colloid swelling rate and reduce the error is a difficult problem to be solved. INVENTION CONTENTS

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a colloid swelling rate test equipment. The colloid swelling rate test equipment provided by the utility model can restore the application scenario of the colloid soaked in the electrolyte when the probe is moved to extrude the to-be-tested colloid soaked in the electrolyte by the power mechanism, and the test is performed in the extrusion mode, so that the most authentic swelling of the colloid can be measured, the swelling rate test result is more accurate, and the error is smaller.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of colloid swelling rate test equipment, and the colloid swelling rate test equipment includes transition column, grating ruler displacement sensor, probe, sample mould and power mechanism;The side wall of the transition column is provided with the grating ruler displacement sensor;The bottom end of the transition column is connected with the probe;The sample mould is located below the probe and is used to hold the to-be-tested colloid soaked in electrolyte;The transition column is connected with the power mechanism, and the power mechanism is used to drive the probe connected with transition column to extrude the to-be-tested colloid soaked in electrolyte.

[0008] The colloid swelling rate test equipment provided by the utility model can restore the application scenario of the colloid soaked in the electrolyte when the probe is moved to extrude the to-be-tested colloid soaked in the electrolyte by the power mechanism, and the test is performed in the extrusion mode, so that the most authentic swelling of the colloid can be measured, the swelling rate test result is more accurate, and the error is smaller.

[0009] Preferably, the power mechanism comprises a gas pressure driving assembly, the gas pressure driving assembly comprises a gas chamber, a piston structure and a moving block, the gas chamber is located above the moving block, a gas inlet is formed in the top end of the gas chamber, and a through hole is formed in the bottom surface of the gas chamber, the piston structure comprises a piston and a piston rod, the piston is located in the inner cavity of the gas chamber, one end of the piston rod is connected to the piston through the through hole, and the other end of the piston rod is connected to the moving block, and the moving block is connected with the transition column.

[0010] Preferably, the gas pressure driving assembly further comprises an air inlet box, air inlets are arranged on the top surface and the side surface of the air inlet box, and an air outlet is arranged on the bottom surface of the air inlet box, the air inlet box is located above the gas chamber, and the air outlet of the air inlet box is in communication with the gas inlet of the gas chamber.

[0011] Preferably, the transition column is a T-shaped column, the T-shaped column comprises a first arm and a second arm arranged vertically, the first arm is located above the second arm, and the top end of the second arm is connected with the side wall of the first arm, the grating ruler displacement sensor is arranged on the side wall of the second arm, the bottom surface of the second arm is connected with the probe, and the first arm is connected with the moving block.

[0012] Preferably, the power mechanism comprises two groups of gas pressure driving assemblies arranged symmetrically, and the moving blocks in the two groups of gas pressure driving assemblies are connected with two ends of the first arm respectively.

[0013] Preferably, the colloid swelling rate testing equipment further comprises a sample table, and the sample table is located below the sample mold and used for carrying the sample mold.

[0014] Preferably, a pressure sensor is arranged on the sample table.

[0015] Preferably, the colloid swelling rate testing equipment further comprises a base, the base is located below the sample table, and the sample table is fixedly connected with the base.

[0016] Preferably, a through hole penetrating through the moving block in the thickness direction is arranged in the middle of the moving block, and a support column is arranged in the through hole and fixedly connected with the base.

[0017] Preferably, the diameter of the probe is 1-5 mm.

[0018] Compared with the prior art, the colloid swelling rate testing equipment has the following beneficial effects:

[0019] The colloid swelling rate testing equipment provided by the utility model can restore the application scene of the colloid soaked in the electrolyte when the probe is driven to move by the power mechanism and the probe is used to extrude the colloid to be tested soaked in the electrolyte, and the colloid can be tested in the extrusion mode, so that the most authentic swelling of the colloid can be measured, the swelling rate testing result is more accurate, and the error is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A plane schematic view of the colloid swelling rate testing equipment provided by the present application.

[0021] Figure 2 A three-dimensional structure schematic view of the colloid swelling rate testing equipment provided by the present application.

[0022] Wherein, 1-probe; 2-transition column; 21-first arm; 22-second arm; 3-air chamber; 4-moving block; 5-sample table; 6-base; 7-gas inlet box; 8-piston rod; 9-strut. DETAILED DESCRIPTION

[0023] It should be understood that, in the description of the present application, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0024] It should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0025] The technical solutions of the present application will be further described below in conjunction with the drawings and through specific embodiments.

[0026] In one embodiment, the present application provides a colloid swelling rate testing equipment, such as Figure 1 and Figure 2As shown, the colloid swelling rate test equipment comprises a transition column 2, a grating ruler displacement sensor, a probe 1, a sample mold and a power mechanism; the grating ruler displacement sensor is arranged on the side wall of the transition column 2; the bottom end of the transition column 2 is connected with the probe 1; the sample mold is located below the probe 1 and is used for containing the to-be-tested colloid immersed in electrolyte; the transition column 2 is connected with the power mechanism, and the power mechanism is used for driving the probe 1 connected with the transition column 2 to extrude the to-be-tested colloid immersed in electrolyte.

[0027] The colloid swelling rate test equipment provided by the utility model can restore the application scene of the colloid immersed in electrolyte when the probe 1 is moved to extrude the to-be-tested colloid immersed in electrolyte by the power mechanism, and the most authentic swelling of the colloid can be measured by the test in the extrusion mode, so that the swelling rate test result is more accurate and the error is smaller.

[0028] The shape of the sample mold is not limited in the utility model, including but not limited to square or circular and the like.

[0029] In one embodiment, the side length of the square sample mold is 1-1000mm, for example, which can be 1mm, 5mm, 10mm, 100mm, 500mm or 1000mm and the like.

[0030] In one embodiment, the power mechanism comprises a gas pressure driving assembly, the gas pressure driving assembly comprises a gas chamber 3, a piston structure and a moving block 4; the gas chamber 3 is located above the moving block 4; the top end of the gas chamber 3 is provided with a gas inlet, and the bottom surface of the gas chamber 3 is provided with a through hole; the piston structure comprises a piston and a piston rod 8, the piston is located in the inner cavity of the gas chamber 3; one end of the piston rod 8 passes through the through hole and is connected with the piston, and the other end is connected with the moving block 4; the moving block 4 is connected with the transition column 2.

[0031] In the utility model, gas is introduced into the gas chamber 3 through the gas inlet, and the piston is moved after reaching a certain gas pressure, so as to drive the piston rod 8, the moving block 4, the transition column 2 and the probe 1 connected with the transition column 2 to move, and the probe 1 extrudes the to-be-tested colloid.

[0032] In one embodiment, the gas pressure driving assembly further comprises an air inlet box 7, the top surface and the side surface of the air inlet box 7 are provided with air inlets, and the bottom surface is provided with an air outlet; the air inlet box 7 is located above the gas chamber 3 and is in communication with the gas inlet of the gas chamber 3 through the air outlet.

[0033] In the utility model, the air inlets of the air inlet box 7 are used for connecting the gas source, and the gas is introduced into the air inlet box 7 through the air inlets, and then introduced into the gas chamber 3 through the air outlet of the air inlet box 7 and the gas inlet of the gas chamber 3.

[0034] In one embodiment, the top surface of the air inlet box 7 is provided with one air inlet; the side surface of the air inlet box 7 is provided with two air inlets, and the two air inlets are arranged on two adjacent side surfaces of the air inlet box 7, respectively.

[0035] In one embodiment, the transition column 2 is a T-shaped column, the T-shaped column comprises a first arm 21 and a second arm 22 arranged vertically, the first arm 21 is located above the second arm 22, and the top end of the second arm 22 is connected with the side wall of the first arm 21; the grating ruler displacement sensor is arranged on the side wall of the second arm 22; the bottom surface of the second arm 22 is connected with the probe 1; and the first arm 21 is connected with the moving block 4.

[0036] In one embodiment, the power mechanism comprises two groups of air pressure driving assemblies arranged symmetrically, and the moving block 4 in each group of air pressure driving assemblies is connected with two ends of the first arm 21, respectively.

[0037] In the utility model, one group of air pressure driving assembly has one moving block 4, and two groups of air pressure driving assemblies have two moving blocks 4, and the two moving blocks 4 are connected with two ends of the first arm 21, respectively. The two groups of air pressure driving assemblies arranged symmetrically jointly provide air pressure driving force, and the stability when the probe 1 extrudes the colloidal to be measured can be improved.

[0038] In the utility model, when the power mechanism comprises two groups of air pressure driving assemblies arranged symmetrically, the symmetric structure of the moving block 4 is pushed after gas enters two air chambers 3 through the two air inlet boxes 7 arranged symmetrically, respectively, and the transition column 2 and the probe 1 are linked and displaced.

[0039] In one embodiment, when the power mechanism comprises two groups of air pressure driving assemblies arranged symmetrically, there are six air inlets; wherein, two air inlets arranged symmetrically in each group of air pressure driving assemblies are regarded as one group, and there are three groups in total.

[0040] In the utility model, the two air inlets arranged symmetrically are used for gas transmission, and the stability when the probe 1 extrudes the colloidal to be measured can be improved.

[0041] In one embodiment, the power mechanism further comprises a gas source, and the gas source is connected with any one group of two air inlets arranged symmetrically, respectively.

[0042] In the utility model, when testing, the gas source can be connected with one group of air inlets arranged symmetrically for gas transmission.

[0043] In one embodiment, the gas source comprises a gas compressor.

[0044] In one embodiment, the colloid swelling rate testing device further comprises a sample table 5 located below the sample mold for carrying the sample mold.

[0045] In one embodiment, a pressure sensor is arranged on the sample table 5.

[0046] In the utility model, the pressure sensor can obtain the colloid pressure value during the process that the probe 1 extrudes the colloid to be measured. According to the yield principle, the stress-strain curve of the colloid can be obtained after the probe 1 is extruded.

[0047] In one embodiment, the colloid swelling rate testing device further comprises a display electrically connected with the pressure sensor and the grating ruler displacement sensor.

[0048] In the utility model, the stress-strain curve of the colloid can be displayed in the display after the probe 1 is extruded.

[0049] In one embodiment, the colloid swelling rate testing device further comprises a base 6 located below the sample table 5, and the sample table 5 is fixedly connected with the base 6.

[0050] In one embodiment, the middle part of the moving block 4 is provided with a through hole penetrating through the moving block 4 in the thickness direction; a support 9 is arranged in the through hole, and the support 9 is fixedly connected with the base 6.

[0051] In the utility model, when the moving block 4 moves, the through hole also moves along the support 9. Therefore, the support 9 can limit the moving block 4 to some extent, so that the moving stability of the moving block 4 is improved, and the stability of the probe 1 extruding the colloid to be measured is improved.

[0052] In one embodiment, the diameter of the probe 1 is 1-5mm, for example, 1mm, 2mm, 3mm, 4mm or 5mm.

[0053] In one embodiment, the method for swelling rate testing by using the colloid swelling rate testing device provided by the utility model comprises:

[0054] (1) The colloid to be measured is placed in the sample mold, and then the initial thickness of the colloid to be measured is measured by the grating ruler displacement sensor, which is recorded as D.

[0055] (2) The sample mold is soaked in the electrolyte, and after soaking, the sample mold is placed on the sample table 5.

[0056] (3) The position of the probe 1 is adjusted so that the probe 1 just contacts the colloid to be measured in the sample mold, and at this time, the displacement read by the grating ruler displacement sensor is recorded as X0.

[0057] (4) The probe 1 is moved by a power mechanism to extrude the to-be-tested colloid immersed in the electrolyte, and when the probe 1 stops moving, the displacement value of the grating ruler displacement sensor at this time is recorded as X1.

[0058] (5) The swelling rate of the to-be-tested colloid is calculated by (X1-X0) / D.

[0059] In the utility model, the swelling rate is calculated by the limit deformation (X1-X0) of the to-be-tested colloid and the initial thickness D, and the result is more accurate.

[0060] In one embodiment, the step (1) of placing the to-be-tested colloid in the sample mold comprises the following steps: according to the aqueous or oily properties of the to-be-tested colloid, the to-be-tested colloid raw material is placed in the sample mold for dissolution and then drying.

[0061] In one embodiment, the soaking time in the step (2) is 1-500h, for example, can be 1h, 2h, 5h, 10h, 50h, 100h, 200h, 300h, 400h, 450h or 500h, etc.

[0062] In the utility model, by regulating the soaking time, the limit deformation of the colloid under different soaking times can be tested, and thus the swelling rate of the colloid under different soaking times can be calculated.

[0063] In one embodiment, the method for testing the swelling rate by using the colloid swelling rate testing equipment provided by the utility model comprises the following steps:

[0064] (I) The to-be-tested colloid raw material is placed in the sample mold for dissolution and then drying, so as to place the to-be-tested colloid in the sample mold, and then the initial thickness of the to-be-tested colloid is measured by the grating ruler displacement sensor, which is recorded as D.

[0065] (II) The electrolyte is added to the sample mold for 1-500h, and after the soaking is completed, the sample mold is placed on the sample table 5.

[0066] (III) The position of the probe 1 is adjusted to make the probe 1 just contact with the to-be-tested colloid in the sample mold, and at this time, the displacement read by the grating ruler displacement sensor is recorded as X0.

[0067] (IV) The gas source is started, the gas is uniformly introduced into the gas warehouse 3 through the gas inlet box 7 of the two groups of gas pressure driving assemblies, the moving block 4 is driven to move by the piston structure under the action of the gas pressure, the moving block 4 drives the probe 1 connected with the transition column 2 to move, the probe 1 extrudes the to-be-tested colloid immersed in the electrolyte, at this time, the speed of the gas changes from uniform speed to negative acceleration, when the speed of the gas approaches 0, the gas is stopped, the probe 1 stops moving, and the displacement value of the grating ruler displacement sensor at this time is recorded as X1.

[0068] (V) by (X1-X0) / D calculated to be measured the swelling rate of the gel.

[0069] In summary, the gel swelling rate test equipment and method provided by the present application can restore the application scenario of the gel soaking in the electrolyte, and the most authentic swelling of the gel can be measured by the test through extrusion, which makes the swelling rate test result more accurate, the error smaller, and the reliability higher.

[0070] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, and those skilled in the art should understand that any changes or replacements within the technical scope disclosed by the present application can be easily thought of by any person skilled in the art, and all fall within the protection scope and disclosure scope of the present application.

Claims

1. A gel-swell ratio testing apparatus characterized by, The colloid swelling rate testing device comprises a transition column, a grating ruler displacement sensor, a probe, a sample mold and a power mechanism. The grating ruler displacement sensor is arranged on the side wall of the transition column; the bottom end of the transition column is connected with the probe; the sample mold is located below the probe and is used for containing the colloid to be tested immersed in electrolyte. The transition column is connected with the power mechanism, and the power mechanism is used for driving the probe connected with the transition column to extrude the colloid to be tested immersed in electrolyte.

2. The gel-swell ratio testing apparatus of claim 1, wherein The power mechanism comprises a gas pressure driving assembly, and the gas pressure driving assembly comprises a gas chamber, a piston structure and a moving block. The gas chamber is located above the moving block. A gas inlet is formed in the top end of the gas chamber, and a through hole is formed in the bottom surface of the gas chamber. The piston structure comprises a piston and a piston rod, the piston is located in the inner cavity of the gas chamber, one end of the piston rod penetrates through the through hole and is connected with the piston, and the other end of the piston rod is connected with the moving block. The moving block is connected with the transition column.

3. The gel-swell ratio testing apparatus of claim 2, wherein, The gas pressure driving assembly further comprises an air inlet box, the top surface and the side surface of the air inlet box are provided with air inlets, and the bottom surface is provided with an air outlet. The air inlet box is located above the gas chamber and is in communication with the gas inlet of the gas chamber through the air outlet.

4. The gel-swell ratio testing apparatus of claim 2 or 3, wherein The transition column is a T-shaped column, the T-shaped column comprises a first arm and a second arm arranged vertically, the first arm is located above the second arm, and the top end of the second arm is connected with the side wall of the first arm. The grating ruler displacement sensor is arranged on the side wall of the second arm; the bottom surface of the second arm is connected with the probe; and the first arm is connected with the moving block.

5. The gel-swell ratio testing apparatus of claim 4, wherein, The power mechanism comprises two groups of symmetrically arranged gas pressure driving assemblies, and the moving blocks of the two groups of gas pressure driving assemblies are respectively connected with two ends of the first arm.

6. The gel-swell ratio testing apparatus of claim 5, wherein, The colloid swelling rate testing device further comprises a sample table, the sample table is located below the sample mold and is used for carrying the sample mold.

7. The gel-swell ratio testing apparatus of claim 6, wherein, A pressure sensor is arranged on the sample table.

8. The gel-swell ratio testing apparatus of claim 6 or 7, wherein, The colloid swelling rate testing device further comprises a base, the base is located below the sample table, and the sample table is fixedly connected with the base.

9. The gel-swell ratio testing apparatus of claim 8, wherein, The middle part of the moving block is provided with a through hole penetrating through the moving block in the thickness direction; a support column is arranged in the through hole, and the support column is fixedly connected with the base.

10. The gel-swell ratio testing apparatus of claim 1, wherein, The diameter of the probe is 1-5 mm.

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