Equipment and system for testing wettability of pole piece

Abstract

The utility model discloses pole piece wettability testing equipment and a testing system, and relates to the technical field of battery testing. The pole piece wettability testing equipment comprises a containing groove, a mounting plate, an electrode converter and a control measuring device, the containing groove is used for containing electrolyte, the mounting plate is located above the containing groove, and a plurality of electrodes are arranged on the mounting plate; one end of a to-be-tested pole piece is fixed on the mounting plate to be electrically connected with the plurality of electrodes, the other end of the to-be-tested pole piece extends into the accommodating groove to be immersed in the electrolyte, the electrode converter is electrically connected with the plurality of electrodes respectively, the electrode converter is provided with a positive power supply end and a negative power supply end, and the control measuring device is electrically connected with the electrode converter. And the control module is used for controlling the connection and disconnection between the positive power supply end and the negative power supply end and any two electrodes so as to calculate the resistance value change between the two adjacent electrodes. The device for testing the wettability of the pole piece can simply, conveniently, quickly and accurately test the wettability of the whole pole piece to be tested.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and more specifically, to an electrode wetting performance testing device and system. Background Technology

[0002] Driven by demand, the active material loading, compaction density, and number of electrode layers in rechargeable batteries are increasing. This presents a challenge to the uniform wetting of the battery cell by the electrolyte. After the electrolyte is injected into the cell, it needs to stand for a period of time to fully wet the electrode sheets and separator. Under normal temperature conditions, this period usually needs to be more than 36 hours. If the wetting is insufficient, black spots may appear at the interface after the battery undergoes formation and capacity testing, or even lithium plating may occur. This not only affects the battery's consistency but also poses a safety hazard.

[0003] In existing technologies, wetting angle measuring instruments are commonly used to measure the wetting angle to evaluate the wetting performance of batteries. This method has the following problems: First, it is complicated to operate, requires equipment operation training, and the testing steps are very complex; second, the wetting angle can only reflect the wettability of the electrode surface to the electrolyte, and cannot reflect the overall impact on the post-filling and settling process; third, battery electrodes are mostly dark in color, making it difficult to distinguish between wet and dry states, and the wetting angle immersion rate is too fast to be easily observed. Utility Model Content

[0004] The purpose of this application is to provide an electrode wetting performance testing device and system that can simply, conveniently, quickly and accurately measure the overall wetting performance of the electrode to be tested.

[0005] The embodiments of this application are implemented as follows:

[0006] A first aspect of this application provides an electrode wetting performance testing device, including a receiving tank, a mounting plate, an electrode converter, and a control and measurement device. The receiving tank is used to contain an electrolyte. The mounting plate is located above the receiving tank and has multiple electrodes. One end of the electrode to be tested is fixed to the mounting plate for electrical connection with the multiple electrodes, and the other end extends into the receiving tank to be immersed in the electrolyte. The electrode converter is electrically connected to the multiple electrodes respectively and has a positive power supply terminal and a negative power supply terminal. The control and measurement device is electrically connected to the electrode converter and is used to control the continuity between the positive power supply terminal and the negative power supply terminal and any two electrodes to calculate the resistance change between two adjacent electrodes. This electrode wetting performance testing device can simply, conveniently, quickly, and accurately measure the overall wetting performance of the electrode to be tested.

[0007] In one possible implementation, a connecting post is provided on one side of the receiving groove, the connecting post extends vertically, and the mounting plate is fixedly installed on the connecting post so that the mounting plate is suspended above the receiving groove.

[0008] In one possible implementation, a connecting rod extends horizontally from the connecting post, and one side of the mounting plate is fixedly mounted on the connecting post via the connecting rod, while the other side is used to fix the electrode to be tested.

[0009] In one possible implementation, the number of connecting rods is at least one; when the number of connecting rods is multiple, the multiple connecting rods are spaced apart on the connecting column along the vertical direction.

[0010] In one possible implementation, a plurality of the electrodes are arranged in an array on the mounting plate along the horizontal and vertical directions.

[0011] As one possible implementation, the spacing between two adjacent electrodes can range from 0.5 mm to 2 mm.

[0012] In one possible implementation, the control and measurement device includes a control module, a current testing module and a voltage testing module electrically connected to the control module. The current testing module is used to obtain the actual current value between two adjacent electrodes, the voltage testing module is used to obtain the actual voltage value between two adjacent electrodes, and the control module is used to calculate the actual resistance value based on the actual current value and the actual voltage value.

[0013] As one possible implementation, the control module is provided with a preset resistance value, and the control module is used to determine the wetting state of the electrolyte on the electrode to be tested based on the comparison result between the actual resistance value and the preset resistance value.

[0014] As one possible implementation, the electrode converter is a multiplexer switch.

[0015] A second aspect of this application provides an electrode wetting performance testing system, including the electrode wetting performance testing equipment described above. This electrode wetting performance testing equipment can simply, conveniently, quickly, and accurately measure the overall wetting performance of the electrode under test.

[0016] The beneficial effects of the embodiments of this application include:

[0017] The electrode wetting performance testing equipment includes a container tank, a mounting plate, an electrode converter, and a control and measurement device. The container tank holds an electrolyte. The mounting plate is located above the container tank and has multiple electrodes. One end of the electrode to be tested is fixed to the mounting plate for electrical connection with the electrodes, while the other end extends into the container tank and is immersed in the electrolyte. The electrode converter is electrically connected to each electrode and has a positive power supply terminal and a negative power supply terminal. The control and measurement device is electrically connected to the electrode converter and is used to control the continuity between the positive and negative power supply terminals and any two electrodes to calculate the resistance change between adjacent electrodes. The electrode wetting performance testing equipment provided in this application only requires fixing the electrode to be tested to the mounting plate with one end immersed in the electrolyte, and then operating the device. The entire operation is simple and convenient. Furthermore, the control and measurement device can quickly control the electrode converter to switch the continuity between different electrodes, thereby rapidly measuring the resistance change between adjacent electrodes. Compared to some traditional testing methods, this method eliminates the need for manual adjustment of the electrode connections, significantly reducing testing time and improving efficiency. By measuring the change in resistance between two adjacent electrodes to reflect the electrode's wetting performance, it can accurately capture the electrode's wetting status, providing a comprehensive and accurate understanding of the electrode's wetting in the electrolyte and offering reliable data support for electrode performance evaluation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the electrode wetting performance testing device provided in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the control structure of the electrode wetting performance testing equipment provided in the embodiments of this application;

[0021] Figure 3 This is a schematic diagram of the control structure of the control and measurement device provided in the embodiments of this application.

[0022] Icons: 100-Electrode wetting performance testing equipment; 10-Accommodation tank; 11-Connecting column; 12-Connecting rod; 20-Mounting plate; 21-Electrode; 30-Electrode converter; 40-Control and measurement device; 41-Control module; 42-Current testing module; 43-Voltage testing module; 50-Wire. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "horizontal," "vertical," etc., do not indicate that the component must be absolutely horizontal or suspended, but can be slightly tilted. The terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Please refer to the reference. Figures 1 to 3This application provides an electrode wetting performance testing device 100, including a receiving tank 10, a mounting plate 20, an electrode converter 30, and a control and measurement device 40. The receiving tank 10 is used to contain electrolyte. The mounting plate 20 is located above the receiving tank 10 and has multiple electrodes 21. One end of the electrode to be tested is fixed to the mounting plate 20 to be electrically connected to the multiple electrodes 21, and the other end extends into the receiving tank 10 to be immersed in the electrolyte. The electrode converter 30 is electrically connected to the multiple electrodes 21 respectively, and the electrode converter 30 has a positive power supply terminal and a negative power supply terminal. The control and measurement device 40 is electrically connected to the electrode converter 30 and is used to control the continuity between the positive power supply terminal and the negative power supply terminal and any two electrodes 21 to calculate the resistance change between two adjacent electrodes 21. This electrode wetting performance testing device 100 can simply, conveniently, quickly, and accurately measure the overall wetting performance of the electrode to be tested.

[0027] It should be noted that, as Figure 1 As shown, in this embodiment, the electrode wetting performance testing device 100 includes a accommodating tank 10, a mounting plate 20, an electrode converter 30, and a control and measurement device 40. The accommodating tank 10 is specifically used to contain electrolyte, providing an immersion environment for the electrode to be tested, so that the electrode can fully contact the electrolyte, which is the basic condition for conducting wetting performance testing.

[0028] The mounting plate 20 is placed above the receiving tank 10, and multiple electrodes 21 are mounted on the mounting plate 20. At the start of the test, one end of the electrode to be tested is fixed to the mounting plate 20, thus establishing an electrical connection between the electrode and the multiple electrodes 21. Simultaneously, the other end of the electrode to be tested extends into the receiving tank 10 and is immersed in the electrolyte, placing the electrode in an electrolyte environment for subsequent testing.

[0029] like Figure 2 As shown, the electrode converter 30 is electrically connected to multiple electrodes 21 on the mounting plate 20 via wires 50, and the electrode converter 30 has a positive power supply terminal and a negative power supply terminal. The main function of the electrode converter 30 is to switch the connection between the positive power supply terminal and the negative power supply terminal and different electrodes 21 under the control of the control and measurement device 40, thereby providing the possibility of circuit connection for measuring the resistance value change between different electrodes 21.

[0030] like Figure 2 As shown, the control and measurement device 40 is electrically connected to the electrode converter 30. The core function of the control and measurement device 40 is to control the on / off state between the positive and negative power supply terminals of the electrode converter 30 and any two electrodes 21. By controlling the on / off state, the resistance change between two adjacent electrodes 21 can be measured, and the wetting performance of the electrode can be inferred based on the resistance change.

[0031] Compared with the prior art, the overall structure of the electrode wetting performance testing device 100 provided in this application is relatively clear and straightforward. It consists of several main parts, including a receiving tank 10, a mounting plate 20, an electrode converter 30, and a control and measurement device 40. The functions of each part are clearly defined. During operation, there is no need for complicated steps or excessive auxiliary equipment. It is only necessary to fix the electrode to be tested on the mounting plate 20, immerse one end of it in the electrolyte, and operate it through the control and measurement device 40. The whole operation process is simple and convenient.

[0032] Furthermore, the electrode wetting performance testing equipment 100 provided in this application can quickly control the electrode converter 30 to switch the on / off states between different electrodes 21 through the control and measuring device 40, thereby rapidly measuring the resistance change between adjacent electrodes 21. Compared with some traditional testing methods, it eliminates the need for manual adjustment of the connection method of the electrode under test, greatly shortening the testing time and improving testing efficiency.

[0033] The wetting performance of the electrode is reflected by measuring the change in resistance between two adjacent electrodes 21. This measurement method is based on the principle that the resistance changes accordingly during electrode wetting, and can accurately capture the wetting status of the electrode. Because the resistance measurement is relatively accurate and stable, the overall wetting performance of the electrode can be accurately judged based on the change in resistance, rather than relying solely on subjective judgment or some less precise measurement methods. In this way, the wetting status of the electrode in the electrolyte can be comprehensively and accurately understood, providing reliable data support for the evaluation of electrode performance.

[0034] In summary, the electrode wetting performance testing equipment 100, through its reasonable structural design and working principle, has the advantages of being simple, convenient, fast, and accurate in measuring the overall wetting performance of the electrode to be tested.

[0035] As one possible implementation method, such as Figure 1 As shown, in this embodiment, a connecting post 11 is provided on one side of the receiving groove 10. The connecting post 11 extends in a vertical direction, and the mounting plate 20 is fixedly installed on the connecting post 11 so that the mounting plate 20 is suspended above the receiving groove 10.

[0036] It should be noted that the connecting post 11 extends vertically and fixes the mounting plate 20, ensuring stable vertical support for the mounting plate 20. During testing, the mounting plate 20 will not easily shake or shift, guaranteeing the accuracy of the position of the electrode to be tested mounted on it. This makes the test results more reliable and avoids changes in the immersion position and state of the electrode in the electrolyte due to instability of the mounting plate 20, which could affect the accuracy of test data such as resistance values.

[0037] Furthermore, the connecting column 11 facilitates the installation and removal of the mounting plate 20. During equipment assembly, the connecting column 11 can be installed on one side of the receiving groove 10 first, and then the mounting plate 20 can be fixed to the connecting column 11, making the operation simple and straightforward. During equipment maintenance, if it is necessary to inspect, repair, or replace parts of the mounting plate 20 or the receiving groove 10, the mounting plate 20 can be easily removed from the connecting column 11, improving the maintainability of the equipment.

[0038] The mounting plate 20 is suspended above the receiving tank 10, providing the necessary space for the installation of the electrode to be tested and its immersion in the electrolyte. One end of the electrode to be tested can be fixed to the mounting plate 20, while the other end can smoothly extend into the electrolyte within the receiving tank 10 without colliding or interfering with other parts of the receiving tank 10. This spatial arrangement facilitates full contact between the electrode and the electrolyte, ensuring the smooth conduct of the immersion test.

[0039] As one possible implementation method, such as Figure 1 As shown in this embodiment, a connecting rod 12 extends horizontally on the connecting post 11. One side of the mounting plate 20 is fixedly mounted on the connecting post 11 via the connecting rod 12, and the other side is used to fix the electrode to be tested.

[0040] It should be noted that the connecting rod 12 extends horizontally from the connecting post 11, meaning that the connecting rod 12 is perpendicular to the connecting post 11. Its horizontal extension provides a lateral support and connection point for the mounting plate 20 and the electrode to be tested. Compared to directly fixing the mounting plate 20 to the connecting post 11, connecting it with the connecting rod 12 better distributes the weight of the mounting plate 20 and the electrode to be tested, reducing the shaking or deformation of the mounting plate 20 due to gravity or external forces during testing. This improves the stability of the mounting plate 20, ensures the accuracy of the electrode position during testing, and facilitates obtaining stable and reliable test results.

[0041] One side of the mounting plate 20 is used to fix the electrode to be tested, and the other side is connected to the connecting post 11 via the connecting rod 12, making the installation of the electrode to be tested more convenient. Operators can more easily access the electrode mounting side of the mounting plate 20 to perform operations such as fixing and adjusting the electrode to be tested. Furthermore, because there is a certain space formed by the connecting rod 12 between the mounting plate 20 and the connecting post 11, the installation and removal of the electrode to be tested are not obstructed by the connecting post 11, improving the convenience and efficiency of operation.

[0042] Furthermore, the connecting rod 12 provides more possibilities for adjusting the position of the mounting plate 20. If it is necessary to adjust the height, angle, or other parameters of the mounting plate 20 according to different testing requirements or electrode specifications, this can be achieved by adjusting the connection position or angle between the connecting rod 12 and the connecting post 11. This allows the equipment to adapt to various types and sizes of electrodes to be tested, improving the equipment's versatility and adaptability, and reducing the cost of replacing the entire equipment or carrying out large-scale modifications due to changes in the test object.

[0043] As one possible implementation method, such as Figure 1 As shown, in this embodiment, the number of connecting rods 12 is at least one. When the number of connecting rods 12 is multiple, the multiple connecting rods 12 are arranged at intervals along the vertical direction on the connecting post 11.

[0044] It should be noted that when there are multiple connecting rods 12 spaced vertically, these rods can be arranged uniformly or non-uniformly on the connecting posts 11, thus providing support to the mounting plate 20 at different heights. Compared to a single connecting rod 12, multiple connecting rods 12 can more evenly distribute the weight of the mounting plate 20 and the electrode under test, as well as the external forces that may be generated during the test, thereby greatly enhancing the stability of the mounting plate 20 and reducing the possibility of it shaking or deforming. At the same time, it also improves the load-bearing capacity of the mounting plate 20, enabling the equipment to accommodate heavier or larger electrode under test, thus broadening the applicability of the equipment.

[0045] Furthermore, the multiple connecting rods 12 spaced vertically provide more options for the mounting position of the mounting plate 20. Those skilled in the art can flexibly choose to fix the mounting plate 20 to the connecting rods 12 at different heights according to the specific size, thickness, or testing requirements of the electrode to be tested. For example, for thicker electrodes, the mounting plate 20 may need to be mounted on a higher connecting rod 12 to ensure sufficient space for the electrode to be immersed in the electrolyte; for thinner electrodes, a lower connecting rod 12 can be selected. This adjustability allows the equipment to better adapt to different types of electrodes, improving the equipment's versatility and testing accuracy.

[0046] As one possible implementation method, such as Figure 1 As shown, multiple electrodes 21 are arranged in an array on the mounting plate 20 along the horizontal and vertical directions. Optionally, the spacing between two adjacent electrodes 21 can range from 0.5 mm to 2 mm. Those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific limitations are imposed here.

[0047] This layout ensures that the electrodes 21 are evenly distributed on the mounting plate 20, enabling electrical connections and measurements at different locations on the electrode under test. Since the wetting performance of different parts of the electrode may vary, multiple electrodes 21 distributed horizontally and vertically can more comprehensively acquire information on resistance changes in different areas of the electrode, thus more accurately evaluating the overall wetting performance of the electrode. Compared to a more random or fewer distribution of electrodes 21, this array-style electrode layout improves test accuracy and reliability, reducing errors caused by a single test location. Furthermore, this layout allows for the selection of combined measurements of electrodes 21 at different locations based on specific test requirements, such as analyzing the horizontal wetting uniformity of the electrode or the vertical wetting depth.

[0048] As one possible implementation method, such as Figure 3 As shown, in this embodiment, the control and measurement device 40 includes a control module 41, a current testing module 42 and a voltage testing module 43 electrically connected to the control module 41. The current testing module 42 is used to obtain the actual current value between two adjacent electrodes 21, the voltage testing module 43 is used to obtain the actual voltage value between two adjacent electrodes 21, and the control module 41 is used to calculate the actual resistance value based on the actual current value and the actual voltage value.

[0049] It should be noted that, as Figure 3 As shown, in this embodiment, the control and measurement device 40 includes a control module 41, a current testing module 42, and a voltage testing module 43. The control module 41 is the core control unit of the entire testing device, which plays a role in coordinating and processing data. The current testing module 42 and the voltage testing module 43 are electrically connected to the control module 41, and they work under the instructions of the control module 41.

[0050] Specifically, the main function of the current testing module 42 is to measure the actual current value between two adjacent electrodes 21. During the electrode immersion test, when current flows through the two adjacent electrodes 21 and the connected electrode portion, the current testing module 42 can accurately obtain the current magnitude data at this time. The voltage testing module 43 is responsible for obtaining the actual voltage value between the two adjacent electrodes 21. In the circuit, since there is a potential difference between the electrodes 21, this voltage value can be accurately measured by the voltage testing module 43.

[0051] As for the control module 41, on the one hand, it is responsible for controlling the current testing module 42 and the voltage testing module 43 to perform corresponding measurement operations. On the other hand, based on Ohm's law, it can calculate the actual resistance value between two adjacent electrodes 21 using the actual current value obtained by the current testing module 42 and the actual voltage value obtained by the voltage testing module 43. Since the resistance of the electrode changes with the penetration and distribution of the electrolyte during the wetting process, accurate resistance measurement results can more accurately reflect the wetting state and performance of the electrode.

[0052] As one possible implementation, in this embodiment, the control module 41 is provided with a preset resistance value. The control module 41 is used to determine the wetting state of the electrolyte on the electrode to be tested based on the comparison between the actual resistance value and the preset resistance value. The preset resistance value can be the resistance value measured on the electrode to be tested in a dry state.

[0053] It should be noted that the control module 41 can also compare the calculated actual resistance value with the preset resistance value, and determine the wetting state of the electrolyte on the electrode to be tested based on the difference between the two. For example, if the actual resistance value is less than the preset resistance value, it may indicate that the electrolyte has well wetted the electrode, resulting in a lower resistance of the electrode; if the actual resistance value is greater than the preset resistance value, it may mean that the wetting degree of the electrolyte is insufficient, and the resistance of the electrode is relatively high.

[0054] By comparing the actual resistance value with the preset resistance value, the wetting state of the electrode is transformed into a specific numerical comparison, making the judgment of the wetting state more objective, accurate, and quantifiable. Compared to relying solely on experience or subjective observation to judge the wetting state, this method based on resistance value comparison provides a more reliable basis and reduces errors and uncertainties in human judgment.

[0055] As one possible implementation, the electrode converter 30 is a multiplexer switch, enabling it to quickly switch the connection between the electrodes 21. For example, when it is necessary to measure the resistance between the first and second electrodes 21, the electrode converter 30 can connect the positive power supply terminal to the first electrode 21 and the negative power supply terminal to the second electrode 21, forming a closed loop; when it is necessary to measure the second and third electrodes 21, the electrode converter 30 can disconnect from the first electrode 21, connect the positive power supply terminal to the second electrode 21 and the negative power supply terminal to the third electrode 21, forming a closed loop.

[0056] Based on the above-mentioned electrode wetting performance testing equipment 100, this application also provides an electrode wetting performance testing method, which mainly includes the following steps:

[0057] S01. Fix the electrode to be tested on the mounting plate 20 so that the electrode to be tested is electrically connected to the electrode 21 on the mounting plate 20, while its lower end is immersed in the electrolyte in the receiving tank 10.

[0058] S02. By controlling the measuring device 40 to select two adjacent electrodes 21 in sequence along the horizontal direction, measure their current and voltage, and calculate the preset resistance value R0.

[0059] S03. After starting the test, monitor the actual resistance value R1 of the two adjacent electrodes 21 in real time.

[0060] S04. When the control and measurement device 40 calculates that the difference between R1 and R0 exceeds the preset threshold, it determines that the electrolyte has wetted the current electrode 21 position.

[0061] S05. By controlling the measuring device 40 to sequentially change the two adjacent electrodes 21 under test in the vertical direction, the position of the highest wetting electrode 21 can be obtained, thereby calculating the wetting height of the electrode to be tested.

[0062] This application also provides an electrode wetting performance testing system, including the electrode wetting performance testing device 100 described above. Since the structure and beneficial effects of the electrode wetting performance testing device 100 have been described in detail in the foregoing embodiments, they will not be repeated here.

[0063] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0064] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A pole piece wettability test apparatus, characterized by, The electrode immersion performance test device comprises a containing groove, a mounting plate, an electrode converter and a control measurement device, the containing groove is used for containing electrolyte, the mounting plate is located above the containing groove, a plurality of electrodes are arranged on the mounting plate, one end of a test electrode is fixed on the mounting plate to be electrically connected with the plurality of electrodes, and the other end of the test electrode extends into the containing groove to be immersed in the electrolyte, the electrode converter is electrically connected with the plurality of electrodes respectively, the electrode converter has a positive power supply end and a negative power supply end, and the control measurement device is electrically connected with the electrode converter, and is used for controlling the on-off between the positive power supply end, the negative power supply end and any two electrodes to calculate the resistance value change between adjacent two electrodes.

2. The pole piece wettability test apparatus of claim 1, wherein, One side of the containing groove is provided with a connecting column extending in the vertical direction, and the mounting plate is fixedly installed on the connecting column so as to be suspended above the containing groove.

3. The pole piece wettability test apparatus of claim 2, wherein, The connecting column extends a connecting rod in the horizontal direction, one side of the mounting plate is fixedly installed on the connecting column through the connecting rod, and the other side is used for fixedly installing the test electrode.

4. The pole piece wettability test apparatus of claim 3, wherein, The number of the connecting rods is at least one, and when the number of the connecting rods is multiple, the multiple connecting rods are arranged on the connecting column in the vertical direction.

5. The pole piece wettability test apparatus of claim 1, wherein, The plurality of electrodes are arranged in an array on the mounting plate in the horizontal direction and the vertical direction.

6. The pole piece wettability test apparatus of claim 5, wherein, The interval between adjacent two electrodes ranges from 0.5 mm to 2 mm.

7. The pole piece wettability test apparatus of claim 1, wherein, The control measurement device comprises a control module, a current test module and a voltage test module electrically connected with the control module, the current test module is used for obtaining an actual current value between adjacent two electrodes, the voltage test module is used for obtaining an actual voltage value between adjacent two electrodes, and the control module is used for calculating an actual resistance value according to the actual current value and the actual voltage value.

8. The pole piece wettability test apparatus of claim 7, wherein, The control module is provided with a preset resistance value, and the control module is used for judging the immersion state of the electrolyte on the test electrode according to the comparison result of the actual resistance value and the preset resistance value.

9. The pole piece wettability test apparatus of claim 1, wherein, The electrode converter is a multiplexing switch.

10. A pole piece wettability test system characterized by, The electrode immersion performance test device comprises the electrode immersion performance test device according to any one of claims 1 to 9.

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