A drop method wettability test device

Abstract

The utility model relates to a kind of drop method wettability testing device, including sample bearing assembly, drop component and observation component, sample bearing assembly is used to support horizontal paving measured electrode piece;Drop component includes ceramic pump, liquid guide hose and drop tube, ceramic pump is used to quantitatively extract infiltration liquid, the end of drop tube can extend to the upper region of measured electrode piece;Infiltration liquid extracted by ceramic pump is transported to drop tube by liquid guide hose, and drop on the surface of measured electrode piece;Observation component is set corresponding sample bearing assembly, including high magnification camera and light source, light source is used to provide illumination compensation, to identify the demarcation line of infiltration part and non-infiltration part, high magnification camera is used to capture the infiltration halo opening process of infiltration liquid on electrode piece in real time.The utility model vertically photographs the electrode piece of paving, can clearly capture the halo opening process of infiltration liquid on the surface of electrode piece and calculate halo opening area in real time, the wettability of the electrode piece and liquid corresponding to the wettability process of this kind is explained by output area change curve.

Description

Technical Field

[0001] This utility model relates to the field of material performance testing technology, and in particular to a droplet wettability testing device. Background Technology

[0002] Wettability is a core indicator measuring the affinity between solid materials and liquids, directly affecting the application performance of materials in fields such as battery manufacturing and chemical production. For example, in the field of lithium-ion batteries, the wetting effect between the electrolyte and the positive and negative electrode sheets directly determines the battery's energy density, cycle life, and safety performance.

[0003] As the new energy industry continues to demand higher battery energy density, the areal density and compaction density of electrode sheets are constantly increasing, leading to reduced electrode porosity, more tortuous penetration paths, and significantly increased difficulty in electrolyte wetting. If the electrolyte does not wet the electrode sheets sufficiently or uniformly, it will cause increased battery internal resistance, decreased charge and discharge efficiency, and accelerated capacity decay. In extreme cases, it may even lead to lithium plating, short circuits, or thermal runaway. At the same time, excessively long wetting times will also increase production and manufacturing costs.

[0004] Currently, the mainstream testing methods for electrode wettability include the static contact angle method, weighing method, capillary climb method, and extraction-conductivity method. These methods generally have shortcomings: they may have difficulty capturing the dynamic wetting process, or they may have multiple sources of error leading to large test errors, or they may be cumbersome to operate and subject to large human errors, or they may have poor repeatability due to differences in temperature and electrode structure. They cannot meet the high-precision and high-efficiency testing requirements of high areal density and high compaction density electrodes. Utility Model Content

[0005] This invention provides a wettability testing device using a droplet method to solve the aforementioned technical problems.

[0006] To address the aforementioned technical problems, this utility model provides a wettability testing device using a droplet method, comprising a sample carrier component, a droplet component, and an observation component.

[0007] The sample carrier assembly is used to support the horizontally laid-out electrode sheet to be tested;

[0008] The dripping assembly includes a ceramic pump, a liquid guiding hose, and a dripping tube. The ceramic pump is used to quantitatively extract the wetting liquid, and the end of the dripping tube can extend to the area above the electrode to be tested. The wetting liquid extracted by the ceramic pump is transported to the dripping tube through the liquid guiding hose and drips onto the surface of the electrode to be tested.

[0009] The observation component is configured corresponding to the sample carrier component and includes a high-magnification camera and a light source. The light source is used to provide illumination compensation to identify the boundary between the wetted and unwetted parts. The high-magnification camera is used to capture the wetting and spreading process of the wetting liquid on the electrode in real time.

[0010] Preferably, the observation assembly further includes a support, on which the high-magnification camera is mounted and takes pictures of the electrode under test from a perspective perpendicular to the upper surface of the electrode under test.

[0011] Preferably, the high-magnification camera is detachably mounted on the bracket, and the bracket is capable of adjusting the height and angle of the high-magnification camera.

[0012] Preferably, the sample carrier assembly is housed inside a sheet metal cover, and the light source is positioned inside the sheet metal cover, above the electrode to be tested.

[0013] Preferably, the drip tube is inserted into the sheet metal cover from the side, and a sealing guide sleeve is provided at the insertion point.

[0014] Preferably, it also includes a movable component, the movable end of which is connected to the dropper tube to control the relative position of the dropper tube and the electrode to be tested.

[0015] Preferably, the moving component is driven by a motion motor.

[0016] Preferably, the moving component controls the droplet to translate in a direction parallel to the surface of the electrode to be tested.

[0017] Preferably, the light source has a ring structure and is arranged around the outer periphery of the electrode to be tested.

[0018] Preferably, the light source has a hemispherical structure and is positioned directly above the electrode to be tested.

[0019] Compared with the prior art, the droplet wettability testing device provided by this utility model has the following advantages:

[0020] 1. This utility model solves the technical problems of large observation interference and cumbersome operation in traditional wettability testing by the core structure collaborative design of "precise liquid drop-stable sample loading-clear observation". It realizes high precision, convenient operation and universality of electrode wettability testing, significantly improves the reliability of test data and test efficiency, provides stable and efficient technical support for electrode wettability evaluation, and makes up for the lack of detection methods in electrode wettability testing process and the limitations of existing wettability detection methods.

[0021] 2. The sample carrier component in this utility model is specially adapted to the horizontal laying requirements of the electrode to be tested, ensuring that the surface of the electrode is flat and without wrinkles or creases, avoiding the deviation of the droplet spreading trajectory due to the tilt of the electrode, and ensuring the authenticity of the observation data;

[0022] 3. The moving component in this utility model achieves precise adjustment of the dripping position through motor drive and parallel translation design. After dripping, it can be removed from the observation area to avoid obstructing the shooting and improve the continuity of the test.

[0023] 4. This utility model uses ring and hemispherical light sources to provide differentiated uniform illumination, and is compatible with electrode sheets of different sizes and materials, thus broadening the applicability of the device. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the wettability testing device using the droplet method in a specific embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the wettability testing device using the droplet method (ring light source) in a specific embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the wettability testing device using the droplet method (hemispherical light source) in a specific embodiment of this utility model.

[0027] In the figure: 10-Sample carrier assembly, 11-Sheet metal cover, 20-Drip assembly, 21-Ceramic pump, 22-Liquid guiding hose, 23-Drip tube, 24-Motion motor, 30-Observation assembly, 31-High magnification camera, 32-Light source, 33-Support. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The wettability testing device for the droplet method provided by this utility model, such as Figure 1 As shown, it includes a sample carrier assembly 10, a droplet assembly 20, and an observation assembly 30, wherein:

[0032] The sample carrier assembly 10 is used to support the horizontally laid-out electrode sheet to be tested;

[0033] The dripping assembly 20 includes a ceramic pump 21, a liquid guiding tube 22, and a dripping tube 23. The ceramic pump 21 is used to accurately and quantitatively extract the wetting liquid (such as electrolyte). The end of the dripping tube 23 can extend to the area above the electrode to be tested. The wetting liquid extracted by the ceramic pump 21 is transported to the dripping tube 23 through the liquid guiding tube 22 and dripped onto the surface of the electrode to be tested. The above process can be automatically realized by motor control, or it can be manually dripped using a micropipette or other micro-metering tools.

[0034] The observation component 30 is configured corresponding to the sample carrier component 10 and includes a high-magnification camera 31 and a light source 32. The light source 32 is used to provide illumination compensation to form a contrast between the wetted and unwetted parts of the electrode, making it easier to identify the boundary between the wetted and unwetted parts. The high-magnification camera 31 is used to capture the wetting and spreading process of the wetting liquid on the electrode in real time. The area of ​​the wetting liquid spreading on the electrode under test, captured in real time by the high-magnification camera, is used to characterize the wettability of different types of liquids or electrodes.

[0035] This invention solves the technical problems of insufficient drop precision, large observation interference, and cumbersome operation in traditional wettability testing through the core structural collaborative design of "precise drop-stable sample loading-clear observation". It realizes high precision, convenient operation and universality of electrode wettability testing, significantly improves the reliability of test data and test efficiency, and provides stable and efficient technical support for electrode wettability evaluation.

[0036] In some embodiments, please refer to the following: Figure 1 and Figure 2The observation component 30 also includes a bracket 33. The high-magnification camera 31 is mounted on the bracket 33 and takes pictures of the electrode under test from a perspective perpendicular to the upper surface of the electrode under test. Perpendicular shooting can avoid perspective distortion. The rigid structure of the bracket 33 can reduce vibration and improve image clarity.

[0037] In some embodiments, please refer to Figure 1 and Figure 2 The high-magnification camera 31 is detachably mounted on the bracket 33, and the bracket 33 can adjust the height and angle of the high-magnification camera 31, further improving the flexibility and maintenance convenience of the observation component 30.

[0038] In some embodiments, please refer to the following: Figure 2 and Figure 3 The sample carrier assembly 10 is enclosed in a sheet metal cover 11 for isolating external stray light interference. The light source 32 is located inside the sheet metal cover 11 and above the electrode to be tested. By adding a sheet metal cover 11 to the sample carrier assembly 10, the light source 32 is built inside the cover and located above the electrode to be tested, thereby achieving closed protection of the test environment and control of illumination.

[0039] In some embodiments, please refer to the following: Figure 1 and Figure 2 The drip tube 23 is inserted into the sheet metal cover 11 from the side, with its end aligned above the center of the electrode, which solves the connection and sealing problem between the drip tube 23 and the sheet metal cover 11; and a sealing guide sleeve (not shown) is provided at the insertion point to ensure sealing and prevent light leakage, while also guiding and preventing shaking.

[0040] In some embodiments, please refer to the following: Figure 1 The device also includes a moving component. In this embodiment, the moving component is driven by a motion motor 24. The moving end of the moving component is connected to the dripping tube 23, controlling the relative position of the dripping tube 23 and the electrode under test. After dripping, the dripping tube 23 can be driven out of the observation area to avoid affecting the observation effect. This application realizes the controllable adjustment of the relative position of the dripping tube 23 and the electrode under test, solving the limitation of fixed dripping position.

[0041] In some embodiments, the moving component controls the droplet tube 23 to translate in a direction parallel to the surface of the electrode to be tested, ensuring stable droplet height and consistent droplet impact force.

[0042] In some embodiments, the ceramic pump 21 is a micro-precision pump that can precisely control the size and number of droplets, ensuring a stable and controllable drop volume.

[0043] In some embodiments, please refer to the following: Figure 2The light source 32 has a ring structure and is arranged around the outer periphery of the electrode to be tested. The inner side of the ring light source faces the surface of the electrode, providing 360° surround illumination and clearly distinguishing the boundary between the wetted and unwetted areas.

[0044] In some embodiments, please refer to the following: Figure 3 The light source 32 is a hemispherical structure, positioned directly above the electrode under test, providing uniform illumination across the entire area and further ensuring the accuracy of the observation. Of course, the top of the hemispherical light source needs to have an opening to allow the high-magnification camera 31 to capture images vertically.

[0045] The method of using the droplet wettability testing device provided by this utility model is as follows:

[0046] Prepare the wetting liquid (electrolyte) in a small beaker, place it in the suction port of the ceramic pump 21, set a fixed suction volume, and start the ceramic pump 21. The wetting liquid drips onto the cut electrode to be tested through the liquid guiding tube 22 and the drip tube 23. After the dripping is completed, the motion motor 24 controls the drip tube 23 to retract to prevent it from affecting the shooting.

[0047] When the wetting liquid is dropped onto the electrode under test, the droplet will spread or be absorbed on the electrode over time. The camera records the size of the spreading area in real time (once per second). The camera's recognition principle is that a clear boundary between the wetted and unwetted parts of the electrode will appear. Under specific light source compensation conditions, the high-magnification camera 31 uses an algorithm to identify and calculate the size of the wetted area, using the size of the wetted area to indicate the wetting ability of different electrode types or liquid types.

[0048] In summary, the wettability testing device for the dripping method provided by this utility model includes a sample carrying component 10, a dripping component 20, and an observation component 30. The sample carrying component 10 is used to carry the horizontally laid-out electrode to be tested. The dripping component 20 includes a ceramic pump 21, a liquid guiding hose 22, and a dripping tube 23. The ceramic pump 21 is used to accurately and quantitatively extract the wetting liquid, and the end of the dripping tube 23 can extend to the upper area of ​​the electrode to be tested. The wetting liquid extracted by the ceramic pump 21 is transported to the dripping tube 23 through the liquid guiding hose 22 and drips onto the surface of the electrode to be tested. The observation component 30 is set corresponding to the sample carrying component 10 and includes a high-magnification camera 31 and a light source 32. The light source 32 is used to provide illumination compensation to form a contrast between the light and dark areas of the wetted and unwetted areas of the electrode. The high-magnification camera 31 is used to capture the wetting and spreading process of the wetting liquid on the electrode in real time. This invention solves the technical problems of insufficient drop precision, large observation interference, and cumbersome operation in traditional wettability testing through the core structural collaborative design of "precise drop-stable sample loading-clear observation". It realizes high precision, convenient operation and universality of electrode wettability testing, significantly improves the reliability of test data and test efficiency, and provides stable and efficient technical support for electrode wettability evaluation.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A wettability testing device using a droplet method, characterized in that, Includes sample carrier components, droplet components, and observation components. The sample carrier assembly is used to support the horizontally laid-out electrode sheet to be tested; The dripping assembly includes a ceramic pump, a liquid guiding hose, and a dripping tube. The ceramic pump is used to quantitatively extract the wetting liquid, and the end of the dripping tube can extend to the area above the electrode to be tested. The wetting liquid extracted by the ceramic pump is transported to the dripping tube through the liquid guiding hose and drips onto the surface of the electrode to be tested. The observation component is configured corresponding to the sample carrier component and includes a high-magnification camera and a light source. The light source is used to provide illumination compensation to identify the boundary between the wetted and unwetted parts. The high-magnification camera is used to capture the wetting and spreading process of the wetting liquid on the electrode in real time.

2. The wettability testing apparatus by drop method as described in claim 1, characterized in that, The observation assembly also includes a support frame, on which the high-magnification camera is mounted and takes pictures of the electrode under test from a perspective perpendicular to the upper surface of the electrode under test.

3. The wettability testing apparatus by drop method as described in claim 2, characterized in that, The high-magnification camera is detachably mounted on the bracket, and the bracket can adjust the height and angle of the high-magnification camera.

4. The wettability testing apparatus by drop method as described in claim 1, characterized in that, The sample carrier assembly is housed inside a sheet metal cover, and the light source is positioned inside the sheet metal cover, above the electrode to be tested.

5. The wettability testing apparatus by drop method as described in claim 4, characterized in that, The drip tube enters the sheet metal cover from the side, and a sealing guide sleeve is provided at the insertion point.

6. The wettability testing apparatus by drop method as described in claim 5, characterized in that, It also includes a moving component, the moving end of which is connected to the dropper tube to control the relative position of the dropper tube and the electrode to be tested.

7. The wettability testing apparatus by drop method as described in claim 6, characterized in that, The moving component is driven by a motion motor.

8. The wettability testing apparatus by drop method as described in claim 7, characterized in that, The moving component controls the droplet tube to translate along a direction parallel to the surface of the electrode to be tested.

9. The wettability testing apparatus by drop method as described in claim 1, characterized in that, The light source has a ring structure and is arranged around the outer periphery of the electrode to be tested.

10. The wettability testing apparatus by drop method as described in claim 1, characterized in that, The light source is a hemispherical structure, positioned directly above the electrode to be tested.

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