Device for measuring infiltration rate of electrolyte

Abstract

The utility model relates to a device for measuring the infiltration rate of electrolyte, which comprises a container provided with a cavity with an opening, and the cavity is used for storing the electrolyte; the outer surface of the object carrying plate is provided with at least one object carrying cavity, and the object carrying cavity is used for carrying a test sample; the carrying cavity extends in the height direction of the carrying plate. Wherein the carrying plate is arranged in a cavity of a container with electrolyte in a hanging manner. According to the measuring device, the electrolyte infiltration rate is tested by setting up a device adopting a suspension method, and the difficulty of electrolyte infiltration in battery cells with different designs is judged according to the climbing rate of electrolyte in workpieces such as pole pieces and diaphragms; moreover, the measuring method of the measuring device is simple and easy to operate, and expensive measuring devices such as a CCD visual tester are not needed, so that the measuring device is simple and cheap.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a device for measuring electrolyte infiltration rate. Background Art

[0002] The electrolyte infiltration rate of the battery's pole piece has a great impact on the battery performance. When the electrolyte infiltration rate of the pole piece is not good, the ion transmission path becomes longer, hindering the shuttle of ions between the positive and negative pole pieces, and the pole piece that is not in contact with the electrolyte cannot participate in the battery's electrochemical reaction. At the same time, the battery interface resistance increases, affecting the battery's rate performance, discharge capacity and service life. The electrolyte infiltration rate of pole pieces with different material systems and different process parameters must be different, so measuring the electrolyte infiltration rate of the pole piece is helpful for reasonable battery design and performance improvement.

[0003] In the battery manufacturing process, after the electrolyte is injected, it needs to be left to stand for a period of time to ensure that the pole piece and the diaphragm are fully infiltrated. If the electrolyte does not fully infiltrate the pole piece and the diaphragm, problems such as lithium precipitation may occur, which greatly deteriorates the safety performance of the battery. If the electrolyte infiltrates the pole piece and the diaphragm for too long, it will extend the battery production cycle and increase the manufacturing cost of the battery. Therefore, it is necessary to develop a measurement device that characterizes the electrolyte infiltration rate of the pole piece to guide the design of the battery cell.

[0004] However, existing measuring devices usually require expensive measuring devices such as CCD visual testers, resulting in high cost of the measuring devices and cumbersome testing methods, and there is room for improvement. Utility Model Content

[0005] In order to overcome at least one defect of the prior art described above, according to one aspect of the utility model, a device for measuring electrolyte infiltration rate is provided. The testing method of the measuring device is simple and easy to use, and the measuring device is simple and cheap.

[0006] A device for measuring electrolyte infiltration rate, comprising:

[0007] A container, wherein the container is provided with an open cavity, and the cavity is used to store an electrolyte;

[0008] A carrier plate, wherein the outer surface of the carrier plate is provided with at least one carrier cavity, the carrier cavity is used to carry the test sample; the carrier cavity is extended along the height direction of the carrier plate;

[0009] Wherein, the carrier plate is suspended in the cavity of a container with electrolyte.

[0010] In an embodiment of the present invention, a plurality of the carrier cavities are provided, and the plurality of carrier cavities are arranged at intervals along the length direction of the carrier plate, and a scale line is provided on the outer surface of the carrier plate beside each carrier cavity.

[0011] In an embodiment of the present invention, bonding parts are provided at both ends of the loading cavity along the height direction of the loading plate, and the bonding parts are used to bond the test sample.

[0012] In an embodiment of the present invention, a pressing block for pressing and fixing the test sample is disposed on the top and / or bottom of the carrier plate.

[0013] In an embodiment of the utility model, threaded holes are provided through the top and / or bottom of the loading plate along the thickness direction thereof, and the pressing block is provided with screw members threadably matched with the threaded holes.

[0014] In an embodiment of the utility model, a top cover is provided on the loading plate, the top cover is provided at the opening of the cavity of the container, and a sealing member is provided between the top cover and the opening.

[0015] In one embodiment of the present invention, in the width direction of the carrier plate, the width W1 of the carrier cavity is in the range of: 15 mm ≤ W1 ≤ 40 mm;

[0016] In the height direction of the carrier plate, the height H1 of the carrier cavity is in the range of 10 mm ≤ H1 ≤ 50 mm.

[0017] In one embodiment of the utility model, in the height direction of the carrier plate, a top entity structure is set between the top end of the carrier cavity and the top side of the carrier plate, and a bottom entity structure is set between the bottom end of the carrier cavity and the bottom side of the carrier plate, and the height of the top entity structure is greater than the height of the bottom entity structure.

[0018] In an embodiment of the present invention, a scale line is arranged on the outer surface of the carrier plate beside the carrier cavity.

[0019] In an embodiment of the present invention, the container is at least partially transparent.

[0020] In an embodiment of the present invention, the loading cavity is disposed through the loading plate in the thickness direction.

[0021] In summary, the present invention provides a device for measuring electrolyte infiltration rate, which has the following technical effects:

[0022] The measuring device tests the electrolyte infiltration rate by building a suspension method device, and uses the speed of the electrolyte climbing rate in workpieces such as pole pieces and diaphragms to judge the difficulty of the electrolyte infiltration in battery cells with different designs. It has important guiding significance for studying the relationship between the electrolyte infiltration rate and the battery cell and pole piece design, and the diaphragm selection; and the testing method of the measuring device is simple and easy to use, and does not require expensive measuring devices such as CCD visual testers, so the measuring device is simple and cheap. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the measuring device of an embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of the structure of the object carrier plate in the measuring device of the embodiment of the utility model;

[0025] Figure: 1-container, 2-carrying plate, 21-carrying cavity, 22-threaded hole, 3-top cover, 31-fixing bolt, 4-handle, 5-test sample. DETAILED DESCRIPTION

[0026] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] The embodiment of the utility model discloses a measuring device, such as Figure 1 and Figure 2The measuring device includes a container 1, which is provided with an open cavity for storing electrolyte; the measuring device also includes a carrier plate 2, the outer surface of which is provided with at least one carrier cavity 21, which is used to carry a test sample 5; the carrier cavity 21 is extended along the height direction of the carrier plate 2; wherein the carrier plate 2 is suspended in the cavity of the container 1 having the electrolyte.

[0030] The test sample 5 of the measuring device can be a material such as an electrode, a diaphragm, etc., which is not limited here. In the specific use process, the test sample 5 of the material such as the electrode, the diaphragm, etc. is first fixed in the loading cavity 21 of the loading plate 2, and it is best to parallel the test sample 5 to the scale line for better observation; then the electrolyte is poured into the cavity of the container 1, wherein a starting scale can preferably be set in the cavity, and the electrolyte is poured into the cavity until it covers the starting scale, so as to better control the amount of electrolyte and avoid waste; finally, the loading plate 2 is suspended in the cavity of the container 1 with the electrolyte for testing.

[0031] This measuring device is used to test the electrolyte infiltration rate. It can be used to determine the difficulty of electrolyte infiltration in cells of different designs by measuring the electrolyte climbing rate in the pole piece and the diaphragm, thereby guiding the cell design. The electrolyte infiltration rate measurement method can be as follows, which is not limited here.

[0032] When the carrier plate 2 is suspended in the cavity of the container 1 with electrolyte, the test sample 5 (such as electrode, diaphragm and other materials) in the carrier cavity 21 will contact with the electrolyte, and the climbing height value of the test sample 5 infiltrated by the electrolyte at this moment is recorded, and the time at this moment is recorded as 0h; thereafter, the climbing height of the electrolyte of the sample is recorded at regular intervals; after multiple records, multiple sets of infiltration time t (unit: h) and climbing height H (unit: mm) data will be obtained; based on these data, the infiltration rate of the test sample 5 of materials such as electrode and diaphragm can be calculated.

[0033] Specifically, but not limited to, Excel spreadsheets can be used to quickly calculate the infiltration rate. Taking multiple test samples 5 as an example, the infiltration rate test can be made more accurate. For example, the data of the infiltration time t (unit: h) and the climbing height H (unit: mm) recorded multiple times are entered into an Excel spreadsheet to calculate the infiltration time t 0.5 and the average climbing height H1 of the plurality of test samples 5; the average climbing height H1 is used as the ordinate and the infiltration time t 0.5 Draw a scatter plot with λ as the horizontal axis; select the data, set the trend line format, select "Linear", check "Show formula, show R square value", and the slope K of the formula is the infiltration rate.

[0034] In summary, the measuring device tests the electrolyte infiltration rate by building a suspension method device, and uses the speed of the electrolyte climbing rate in workpieces such as electrodes and diaphragms to judge the difficulty of electrolyte infiltration in battery cells with different designs. It has important guiding significance for studying the relationship between electrolyte infiltration rate and battery cell and electrode design, and diaphragm selection; and the testing method of the measuring device is simple and easy to use, and does not require expensive measuring devices such as CCD visual testers, so the measuring device is simple and inexpensive.

[0035] Since it is necessary to record the climbing height value of the test sample 5 infiltrated by the electrolyte in the test of the electrolyte infiltration rate, in an optional embodiment, the outer surface of the carrier plate 2 is provided with a scale line beside the carrier cavity 21, and the scale value can be specifically set to directly observe the climbing height value for recording. Of course, in other embodiments, other length measuring tools can also be used for measurement, such as a distance measuring sensor.

[0036] Optionally, a plurality of loading cavities 21 are provided, and the plurality of loading cavities 21 are arranged at intervals along the length direction of the loading plate 2, and the outer surface of the loading plate 2 is provided with scale lines beside each loading cavity 21. In a specific test process, a plurality of test samples 5 may be used for testing to improve the accuracy of the test, so a plurality of loading cavities 21 may be provided, each loading cavity 21 independently carries a test sample 5, and the plurality of test samples 5 are tested simultaneously to improve the accuracy of the test.

[0037] Optionally, the number of the carrier chambers 21 is 1-6 or more, which is not limited here.

[0038] Optionally, the material of the carrier plate 2 is a material resistant to corrosion by the electrolyte, such as PP, polytetrafluoroethylene, etc., which can effectively avoid corrosion by the electrolyte and extend the service life.

[0039] Optionally, the accuracy of the scale lines on the carrier plate 2 is at least 1 mm to improve the accuracy of the test.

[0040] Optionally, the loading cavity 21 is arranged to penetrate along the thickness direction of the loading plate 2 , so that the user can better fix the test sample 5 in the loading cavity 21 and improve the test efficiency.

[0041] Optionally, the two ends of the loading cavity 21 along the height direction of the loading plate 2 are provided with bonding parts, and the bonding parts are used to bond the test sample 5. When the test sample 5 is assembled into the loading cavity 21, it can be assembled by bonding, that is, bonding parts are provided at both ends of the loading cavity 21, and the test sample 5 is bonded into the loading cavity 21. The bonding method can be specifically as follows: firstly bond the upper end of the test sample 5, then place the test sample 5 parallel to the scale line and keep it tight, and then bond the lower end of the test sample 5 to complete the assembly of the test sample 5. Of course, the bonding method of the test sample 5 is not limited to the above method.

[0042] Optionally, the bonding portion may be a workpiece made of double-sided tape, glue or other sticky materials.

[0043] Alternatively, a pressing block for pressing the test sample 5 is disposed on the top and / or bottom of the carrier plate 2. It can be seen that in addition to assembling the test sample 5 by bonding, a pressing block can also be used to press and fix the test sample 5.

[0044] Optionally, a pressing block for pressing the test sample 5 is provided on the top of the carrier plate 2; or, a pressing block for pressing the test sample 5 is provided on the bottom of the carrier plate 2; or, pressing blocks for pressing the test sample 5 are provided on both the top and the bottom of the carrier plate 2. Therefore, different fixing methods may be specifically used for schemes with different positions of the pressing blocks. For example, taking the example of a pressing block being provided at the top of the body plate, the upper end of the test sample 5 is first pressed and fixed by the pressing block at the top of the carrier plate 2, and then the test sample 5 is parallel to the scale line and kept tight, and then the lower end of the test sample 5 is glued to complete the assembly of the test sample 5; for another example, taking the example of a pressing block being provided at the bottom of the carrier plate 2, the lower end of the test sample 5 is first pressed and fixed by the pressing block at the bottom of the carrier plate 2, and then the test sample 5 is parallel to the scale line and kept tight, and then the upper end of the test sample 5 is glued to complete the assembly of the test sample 5; for another example, taking the example of a pressing block being provided at both the top and bottom of the carrier plate 2, the upper end of the test sample 5 is first pressed and fixed by the pressing block at the top of the carrier plate 2, and then the test sample 5 is parallel to the scale line and kept tight, and then the lower end of the test sample 5 is pressed and fixed by the pressing block at the bottom of the carrier plate 2 to complete the assembly of the test sample 5.

[0045] Optionally, the top and / or bottom of the sample carrier 2 are provided with threaded holes 22 along the thickness direction thereof, and the pressing block is provided with a screw member threadably matched with the threaded hole 22. The pressing block and the sample carrier 2 can be connected specifically through the threaded hole 22 and the screw member, that is, when the test sample 5 needs to be pressed and fixed, the pressing block can be screwed into the threaded hole 22 through the screw member, so that the pressing block can be close to the sample carrier 2, and finally the test sample 5 is pressed and fixed.

[0046] Optionally, a plurality of threaded holes 22 may be provided, and the plurality of threaded holes 22 may be provided through the thickness direction of the carrier plate 2, and the plurality of threaded holes 22 may be arranged at intervals along the length direction of the carrier plate 2, which has a simple structure, is easy to manufacture, and reduces the manufacturing difficulty.

[0047] Optionally, a top cover 3 is provided on the carrier plate 2, and the top cover 3 is covered at the opening of the cavity of the container 1, and a seal is provided between the top cover 3 and the opening. In the specific test process, in order to further ensure the accuracy of the test and reduce the error caused by the volatilization of the electrolyte, the opening of the cavity is sealed by the seal and the top cover 3 to improve the accuracy of the test. The sealing operation can be specifically performed after the carrier plate 2 is suspended in the cavity of the container 1 with the electrolyte, for example, the electrolyte is poured into the cavity along the side wall of the container 1 until it is submerged in the starting scale, the carrier plate 2 is placed in the cavity, and then sealed with a seal.

[0048] Optionally, the sealing member may be a workpiece having sealing properties such as a sealing film or a sealing film.

[0049] Optionally, in the width direction of the carrier plate 2, the width W1 of the carrier cavity 21 is in the range of 15mm≤W1≤40mm. In this configuration, since the carrier cavity 21 needs to carry the test sample 5, the test sample 5 usually needs to be cut into strips with a width of 15mm-30mm before the test is performed, so the width W1 of the carrier cavity 21 needs to match the size of the cut test sample 5. In some embodiments, the width W1 of the carrier cavity 21 can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, etc.; of course, in some other embodiments, the width W1 of the carrier cavity 21 can be other sizes within the range of 15mm≤W1≤40mm.

[0050] Optionally, in the height direction of the carrier plate 2, the height H1 of the carrier cavity 21 is in the range of 10mm≤H1≤50mm. In this configuration, since the carrier cavity 21 needs to carry the test sample 5, the test sample 5 usually needs to be cut into strips of 10mm-40mm in height before the test is performed, so the height H1 of the carrier cavity 21 needs to match the size of the cut test sample 5. In some embodiments, the height H1 of the carrier cavity 21 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.; of course, in some other embodiments, the height H1 of the carrier cavity 21 can also be other sizes within the range of 10mm≤H1≤50mm.

[0051] Optionally, in the height direction of the carrier plate 2, a top entity structure is provided between the top end of the carrier cavity 21 and the top side of the carrier plate 2, and a bottom entity structure is provided between the bottom end of the carrier cavity 21 and the bottom side of the carrier plate 2, and the height of the top entity structure is greater than that of the bottom entity structure. Since a top cover 3 will be provided on the carrier plate 2 during the test, wherein the top cover 3 will be connected to the top entity structure of the carrier plate 2 specifically by screws or fixing bolts 31, the top entity structure needs to reserve more assembly space than the bottom entity structure, so as to assemble the top cover 3 more stably.

[0052] Optionally, the top entity structure may be provided with the threaded hole 22 mentioned above, so as to press and fix the test sample 5 tightly.

[0053] Optionally, the bottom entity structure may also be provided with the threaded holes 22 mentioned above, so as to press and fix the test sample 5 .

[0054] Optionally, the container 1 is at least partially transparent so that the test personnel can observe the scale lines on the carrier plate 2 from the outside of the container 1, which is convenient for the test personnel to perform the test. In order to better observe the scale lines, the test personnel can illuminate the test sample with a strong flashlight, read out the scale lines of the multiple test samples 5 soaked in the electrolyte and record them.

[0055] Optionally, the container 1 is made of a transparent material, such as glass, to facilitate observation by experimenters.

[0056] Optionally, the container 1 is made of a material that is resistant to corrosion by the electrolyte, such as PP, polytetrafluoroethylene, etc., which can effectively avoid corrosion by the electrolyte and extend the service life.

[0057] Optionally, a handle 4 is provided on the top cover 3 to facilitate the user to lift the loading plate 2 for operation, thereby reducing the difficulty of operation.

[0058] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A device for measuring electrolyte infiltration rate, characterized in that: include: A container (1), wherein the container (1) is provided with an open cavity, wherein the cavity is used to store an electrolyte; A carrier plate (2), wherein the outer surface of the carrier plate (2) is provided with at least one carrier cavity (21), and the carrier cavity (21) is used to carry a test sample (5); the carrier cavity (21) is extended along the height direction of the carrier plate (2); Wherein, the carrier plate (2) is suspended in the cavity of the container (1) containing the electrolyte.

2. The device for measuring electrolyte infiltration rate according to claim 1, characterized in that: A plurality of the carrier cavities (21) are provided, and the plurality of carrier cavities (21) are arranged at intervals along the length direction of the carrier plate (2), and a scale line is provided on the outer surface of the carrier plate (2) beside each carrier cavity (21).

3. The device for measuring electrolyte infiltration rate according to claim 1, characterized in that: The loading cavity (21) is provided with bonding parts at both ends along the height direction of the loading plate (2), and the bonding parts are used to bond the test sample (5).

4. The device for measuring electrolyte infiltration rate according to claim 1, characterized in that: The top and / or bottom of the object carrier plate (2) is provided with a pressing block for pressing and fixing the test sample (5).

5. The device for measuring electrolyte infiltration rate according to claim 4, characterized in that: The top and / or bottom of the object carrier (2) are both provided with threaded holes (22) penetrating along the thickness direction of the object carrier, and the pressing block is provided with a screw member threadably matched with the threaded holes (22).

6. A device for measuring electrolyte infiltration rate according to any one of claims 1 to 5, characterized in that: A top cover (3) is provided on the carrier plate (2), the top cover (3) is provided on the opening of the cavity of the container (1), and a sealing member is provided between the top cover (3) and the opening.

7. A device for measuring electrolyte infiltration rate according to any one of claims 1 to 5, characterized in that: In the width direction of the carrier plate (2), the width W1 of the carrier cavity (21) is in the range of: 15 mm ≤ W1 ≤ 40 mm; In the height direction of the object carrier plate (2), the range of the height H1 of the object carrier cavity (21) is: 10 mm ≤ H1 ≤ 50 mm.

8. The device for measuring electrolyte infiltration rate according to claim 5, characterized in that: In the height direction of the carrier plate (2), a top entity structure is provided between the top end of the carrier cavity (21) and the top side of the carrier plate (2), and a bottom entity structure is provided between the bottom end of the carrier cavity (21) and the bottom side of the carrier plate (2), and the height of the top entity structure is greater than the height of the bottom entity structure.

9. A device for measuring electrolyte infiltration rate according to any one of claims 1 to 5 and 8, characterized in that: The outer surface of the object carrier plate (2) is provided with scale lines beside the object carrier cavity (21).

10. A device for measuring electrolyte infiltration rate according to any one of claims 1 to 5 and 8, characterized in that: The container (1) is at least partially transparent; The object-carrying cavity (21) is arranged to penetrate along the thickness direction of the object-carrying plate (2).

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