Electrode testing device and electrode testing equipment
By setting the working electrode outside the cavity in the electrode testing device and using components such as vias and sealing rings, the negative impact of the working electrode test area control method on the test results in the existing technology is solved, and higher test accuracy and sealing are achieved.
Patent Information
- Application Number
- CN202521649307.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-05
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2035-08-05
AI Technical Summary
In existing electrode testing, the method of controlling the testing area of the working electrode may negatively affect the test results. For example, the conductive clamp and the coating structure are exposed to the test solution, causing measurement errors and dissolution contamination.
The working electrode is set outside the test chamber and contacts the test solution through a via. Combined with an annular sealing ring, a limit plate and an elastic buffer component, accurate control of the test area and sealing effect are ensured to prevent the working electrode from being completely immersed in the solution.
The accuracy of the test results is improved, the negative impact on the test solution is reduced, the sealing and test accuracy are enhanced, and the operation difficulty is reduced.
Smart Images
Figure CN223485907U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery processing technology, and in particular to an electrode testing device and electrode testing equipment. Background Technology
[0002] In the field of new energy, electrode testing is of great significance for electrochemical research, aiming to gain a deeper understanding of the performance of electrode materials and optimize the design of battery cells. Electrode testing typically includes basic characterization tests, steady-state polarization tests, transient kinetic tests, impedance spectroscopy analysis, battery-specific tests, and extreme condition tests. Many of these tests require precise control of the test area of the working electrode (i.e., the test electrode) participating in the reaction. However, current methods for controlling the test area of the working electrode negatively impact the test results. Utility Model Content
[0003] The main objective of this application is to propose an electrode testing device and electrode testing equipment, which aims to improve the problem that the current method of controlling the test area of the working electrode has a negative impact on the test results.
[0004] Firstly, the electrode testing apparatus proposed in this application includes:
[0005] The main structure includes a test chamber for containing a test solution, one wall of which is a first wall, and a through hole is provided in the first wall; and...
[0006] A working electrode assembly is disposed on the outer side of the first cavity wall and covers the through hole. The working electrode assembly includes a working electrode, which is at least partially exposed in the through hole for contact with the test solution within the test cavity; and...
[0007] An auxiliary electrode is at least partially disposed within the test chamber for insertion into the test solution.
[0008] In the technical solution provided in this application, the working electrode assembly is disposed on the outside of the first cavity wall and the through hole is sealed by a cover. Since the working electrode is at least partially exposed in the through hole, the test solution in the test cavity can contact the working electrode through the through hole. The actual exposed area of the working electrode is the test area, which can achieve the purpose of controlling the test area of the working electrode. Since the working electrode assembly does not need to be completely immersed in the test solution, its negative impact on the test solution is small, and the accuracy of the test results is higher.
[0009] In some embodiments, the working electrode assembly further includes an annular sealing ring, which is detachably disposed between the outer side of the first cavity wall and the working electrode, and the annular sealing ring is arranged around the periphery of the through hole.
[0010] In the above technical solution, the annular sealing ring is detachably disposed between the outer side of the first cavity wall and the working electrode. Since the annular sealing ring is arranged around the periphery of the through hole, the inner cavity of the annular sealing ring can be connected to the working electrode through the through hole. The cross-sectional area of the inner cavity of the annular sealing ring is directly related to the test area of the working electrode. By replacing the annular sealing ring with different inner cavity sizes, the test area of the working electrode can be adjusted.
[0011] In some embodiments, an installation groove is provided on the outer side of the first cavity wall, and the through hole is provided through the bottom wall of the installation groove;
[0012] The annular sealing ring is accommodated in the mounting groove.
[0013] In the above technical solution, an installation groove is provided on the outer side of the first cavity wall, and the annular sealing ring is accommodated in the installation groove. The installation groove plays a role in the installation and positioning of the annular sealing ring. During the installation of the working electrode assembly, an annular sealing ring of appropriate specifications can be selected and placed in the installation groove first, and then the working electrode can be covered on the outer end of the annular sealing groove. This can reduce the probability of the annular sealing ring deviating from the through hole and ensure the accuracy of the test results.
[0014] In some embodiments, the working electrode assembly further includes a limiting plate connected to the main structure and abutting against the side of the working electrode opposite to the through hole.
[0015] In the above technical solution, the limiting plate is connected to the main structure and abuts against the working electrode, thereby applying pressure to the working electrode toward the through hole. Under the action of pressure, the working electrode can be stably maintained in the position of the cover through hole, while also limiting the assembly gap between the working electrode assembly and the main structure, effectively suppressing the overflow of the test solution.
[0016] In some embodiments, an elastic buffer portion is also provided between the limiting plate and the working electrode.
[0017] In the above technical solution, the presence of the elastic buffer can buffer the pressure applied to the working electrode by the limiting plate, thereby reducing the probability of the working electrode being crushed. At the same time, the elastic buffer can also store elastic potential energy to continuously provide sufficient pressure to the working electrode, ensuring the sealing effect between the working electrode assembly and the main structure.
[0018] In some embodiments, the limiting plate is provided with a limiting groove, and the working electrode is at least partially disposed in the limiting groove.
[0019] In the above technical solution, the limiting groove serves to provide an installation base for the working electrode, ensuring that the working electrode is stably maintained in the position corresponding to the through hole, and further improving the limiting effect of the limiting plate on the working electrode.
[0020] In some embodiments, the limiting groove is disposed on one side of the limiting plate along the thickness direction, and the port of the limiting groove in its extension direction passes through the peripheral end of the limiting plate.
[0021] The working electrode is located at least partially outside the limiting groove.
[0022] In the above technical solution, the working electrode is located at least partially outside the limiting groove, which is beneficial for the working electrode to be connected to the test circuit of the electrode testing equipment. For example, it is beneficial for the conductive claws of the test circuit to hold the working electrode, thus reducing the difficulty of operation.
[0023] In some embodiments, the limiting plate is disposed at the bottom of the main structure and supports the main structure.
[0024] In the above technical solution, since the test chamber of the main structure needs to contain the test solution and provide space for the auxiliary electrode installation, its overall weight during the test is relatively large. Setting the limiting plate at the bottom of the main structure can not only support the main structure, but also allow the main structure to apply greater pressure to the working electrode assembly due to its own large weight, thereby ensuring the sealing effect between the working electrode assembly and the main structure.
[0025] In some embodiments, an overlapping plate is provided at the bottom of the main structure;
[0026] The limiting plate is locked to the overlapping plate.
[0027] In the above technical solution, the lap plate can provide a connection base for the limit plate, and at the same time, it can improve the support capacity of the limit plate and reduce the risk of the main structure overturning. Furthermore, locking the limit plate to the lap plate can also reduce the installation difficulty of the working electrode by disassembling and assembling the limit plate.
[0028] In some embodiments, the electrode testing device further includes a reference electrode, which is at least partially disposed within the test chamber for insertion into the test solution.
[0029] In the above technical solution, the presence of the reference electrode, working electrode, and auxiliary electrode constitutes a three-electrode testing system. Compared with the two-electrode testing system, the three-electrode testing system has higher potential control and potential measurement accuracy, and can more accurately obtain the electrochemical characteristics of the working electrode (e.g., polarization, reaction kinetics, capacitance, etc.).
[0030] In some embodiments, the reference electrode includes a Luggin capillary for insertion into the test solution.
[0031] In the above technical solution, the micron-sized tip of the Lugin capillary causes less disturbance to the flow field and diffusion field in the test solution, which is beneficial to maintaining stable mass transfer conditions on the working electrode surface. By setting an electrolyte solution compatible with the test solution inside the Lugin capillary, ion conduction between the reference electrode and the test solution can be achieved, which improves the problem that the internal solution of the reference electrode is prone to contaminating the test solution. At the same time, it can also improve the problem that the test solution is prone to reverse contamination of the reference electrode.
[0032] In some embodiments, the main structure includes a base and a cover, the cover covering the opening of the base, the cover and the base together defining the test cavity, and the cover having a plurality of through holes;
[0033] The reference electrode and the auxiliary electrode are disposed in the corresponding through holes;
[0034] The first cavity wall is disposed on the substrate.
[0035] In the above technical solution, the main structure is designed to be formed by the mutual sealing of the base and the cover, which makes it convenient for operators to inject and pour the test solution into the test chamber. The reference electrode and the auxiliary electrode are installed on the cover through corresponding through holes, which helps to reduce the installation difficulty of the reference electrode and the auxiliary electrode and ensure the relative position accuracy of the reference electrode and the auxiliary electrode.
[0036] In some embodiments, the cover has a protrusion on the side facing the base, the protrusion is inserted into the opening of the base and abuts against the inner wall of the base, and the through hole passes through the protrusion.
[0037] In the above technical solution, the protrusion is inserted into the opening of the substrate and abuts against the inner wall of the substrate. On the one hand, the protrusion can serve as a positioning structure between the cover and the substrate to ensure that the cover fits the substrate precisely. On the other hand, the protrusion can also serve as a sealing structure between the cover and the substrate to improve the sealing performance of the main structure and prevent the test solution from leaking and affecting the electrochemical test.
[0038] Secondly, this application also proposes an electrode testing device, including an electrode testing apparatus. Attached Figure Description
[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0040] Figure 1 A schematic diagram of the structure of an embodiment of the electrode testing device provided in this application;
[0041] Figure 2 for Figure 1 Top view of the middle electrode testing device;
[0042] Figure 3 for Figure 2 Structural diagram of the middle section AA;
[0043] Figure 4 for Figure 3 An enlarged structural schematic diagram of one embodiment of part B in the middle;
[0044] Figure 5 for Figure 3 A magnified structural diagram of another embodiment of part B in the middle.
[0045] Explanation of icon numbers:
[0046] 100. Electrode testing device;
[0047] 1. Main structure; 1a. Test chamber; 11. Base; 111. First chamber wall; 111a. Through hole; 111b. Mounting groove; 112. Overlap plate; 12. Cover; 12a. Through hole; 121. Protrusion; 2. Working electrode assembly; 21. Working electrode; 22. Annular sealing ring; 22a. Inner cavity; 23. Limiting plate; 23a. Limiting groove; 231. Bolt locking structure; 3. Auxiliary electrode; 4. Reference electrode; 5. Elastic buffer.
[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0049] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0051] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0052] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.
[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0056] In the field of new energy, electrode testing is of great significance for electrochemical research, aiming to gain a deeper understanding of the performance of electrode materials and optimize the design of battery cells. Currently, common electrode testing systems include two-electrode and three-electrode systems. Both systems include a working electrode (also called a test electrode) and an auxiliary electrode (also called a counter electrode). The working electrode is the electrode that undergoes the target reaction with the test solution, while the auxiliary electrode provides a current loop to maintain charge balance. Electrode testing typically includes basic characterization tests, steady-state polarization tests, transient kinetic tests, impedance spectroscopy analysis, battery-specific tests, and extreme operating condition tests. Many of these tests require precise control of the test area of the working electrode (i.e., the test electrode) participating in the reaction.
[0057] Currently, the mainstream method for controlling the test area of the working electrode is the immersion area control method, which includes:
[0058] 1. Cut the working electrode into a thin sheet of corresponding area, hold the working electrode with conductive claws, and completely immerse it in the test solution to control the test area.
[0059] Second, by covering part of the surface of the working electrode with a coating structure, while exposing the corresponding test area, and completely immersing the entire electrode in the test solution, the test area can be controlled.
[0060] However, the aforementioned mainstream immersion area control methods all have the same problem: whether it is the conductive gripper or the coating structure, they inevitably need to be immersed in the test solution along with the working electrode. On the one hand, the metal material in the conductive gripper and the coating structure being exposed in the test solution will cause errors in the measurement of the open circuit potential. On the other hand, the conductive gripper and the coating structure may also dissolve in the test solution in small amounts, thereby contaminating the test solution and having a negative impact on the test results.
[0061] Analyzing the above problems, the immersion area control method inevitably leads to excessive immersion of structures other than the working electrode in the test solution, thus negatively affecting the test structure. Since "immersion" is the source of the problem, the immersion area control method can be abandoned.
[0062] In view of this, this application provides an electrode testing device that, by placing the working electrode outside the test chamber and contacting the test solution through a through-hole, can at least improve the problem that the current method of controlling the test area of the working electrode has a negative impact on the test results.
[0063] To facilitate understanding of the electrode testing apparatus provided in this application, the following description is provided in conjunction with the accompanying drawings. Figure 1A schematic diagram of the structure of an embodiment of the electrode testing device provided in this application; Figure 2 for Figure 1 Top view of the middle electrode testing device; Figure 3 for Figure 2 Structural diagram of the middle section AA; Figure 4 for Figure 3 An enlarged structural schematic diagram of one embodiment of part B in the middle; Figure 5 for Figure 3 A magnified structural diagram of another embodiment of part B in the middle.
[0064] Please see Figures 1 to 3 In one embodiment of this application, the electrode testing device 100 includes a main structure 1, a working electrode assembly 2, and an auxiliary electrode 3. The main structure 1 has a test cavity 1a for containing a test solution. One wall of the test cavity 1a is a first cavity wall 111, and the first cavity wall 111 is provided with a through hole 111a. The working electrode assembly 2 is disposed outside the first cavity wall 111 and covers the through hole 111a. The working electrode assembly 2 includes a working electrode 21, which is at least partially exposed in the through hole 111a for contacting the test solution in the test cavity 1a. The auxiliary electrode 3 is at least partially disposed in the test cavity 1a for extending into the test solution.
[0065] It should be noted that the "main body structure 1" can have various shapes and internal structures, but it should at least have a test cavity 1a. The function of the test cavity 1a is to contain the test solution, which is a solution capable of generating an electrochemical reaction with the working electrode 21. In this embodiment, the material of the working electrode 21 is not limited, and therefore the composition of the test solution is not limited either. The cavity wall of the test cavity 1a refers to the solid structure in the main body structure 1 that participates in constructing the test cavity 1a. The "first cavity wall 111" can be the cavity wall at the top of the test cavity 1a or the cavity wall at the bottom of the test cavity 1a. It can even be the cavity wall on the side of the test cavity 1a. Since the first cavity wall 111 is provided with a through hole 111a for supplying test solution to the outside, in the scheme where the "first cavity wall 111" is the cavity wall at the top of the test cavity 1a, it is necessary to consider filling the test cavity 1a with test solution and applying pressure to ensure that the test solution can contact the working electrode 21 through the through hole 111a. However, in the scheme where the "first cavity wall 111" is the cavity wall at the bottom of the test cavity 1a or the cavity wall on the side of the test cavity 1a, it is sufficient as long as the injected test solution can overflow the through hole 111a, and it is not necessary to fill the test cavity 1a completely.
[0066] The "working electrode assembly 2" covers the via 111a. "Covering" refers to covering the outside of the via 111a in a shrouding manner, thus sealing the via 111a. The test solution in the test chamber 1a can reach the working electrode assembly 2 through the via 111a, but it is difficult for it to overflow between the working electrode assembly 2 and the first chamber wall 111. The working electrode 21 can be partially or completely exposed in the via 111a, but due to the way the working electrode assembly 2 "covers" the via 111a, the working electrode 21 is only exposed on one side of the via 111a. The area of the working electrode 21 actually exposed in the via 111a is the test area. It is worth mentioning that the size of the test area is not directly related to the size of the cross-sectional area of the via 111a. The via 111a can exist only as a flow channel for the test solution. Only when the working electrode 21 directly contacts the first cavity wall 111 and covers the via 111a, is the cross-sectional area of the via 111a the test area of the working electrode 21. This application does not limit the cross-sectional shape of the via 111a. For example, the cross-section of the via 111a can be circular, triangular, square, or even an irregular polygon.
[0067] The "auxiliary electrode 3" can be partially disposed within the test chamber 1a and extend into the test solution, or it can be entirely disposed within the test chamber 1a and extend into the test solution. The auxiliary electrode 3 is a conductor in the electrochemical system (usually an inert metal, such as platinum, graphite, gold, etc.). Its main function is to provide or receive electrons and form a current loop with the working electrode 21. The existence of the auxiliary electrode 3 is to ensure that the target electrochemical reaction (oxidation or reduction) occurring on the working electrode 21 can proceed smoothly, while reducing its own electrochemical behavior from interfering with the measurement. The specific material and structural shape of the auxiliary electrode 3 are not limited in the embodiments of this application.
[0068] In the technical solution provided in this application, the working electrode assembly 2 is disposed on the outside of the first cavity wall 111, and the through hole 111a is sealed by a cover. Since the working electrode 21 is at least partially exposed in the through hole 111a, the test solution in the test cavity 1a can contact the working electrode 21 through the through hole 111a. The actual exposed area of the working electrode 21 is the test area, which can achieve the purpose of controlling the test area of the working electrode 21. Since the working electrode assembly 2 does not need to be completely immersed in the test solution, its negative impact on the test solution is small, and the accuracy of the test results is higher.
[0069] Please see Figures 3 to 5 In some embodiments, the working electrode assembly 2 further includes an annular sealing ring 22, which is detachably disposed between the outer side of the first cavity wall 111 and the working electrode 21, and the annular sealing ring 22 is arranged around the periphery of the through hole 111a.
[0070] It should be noted that the annular sealing ring 22 can have various specific shapes, such as being circular or square. Regardless of its shape, the annular sealing ring 22 typically has an inner cavity 22a extending along its thickness. The cross-sectional shape of this inner cavity 22a can match the outer shape of the annular sealing ring 22; for example, the cross-sectional shape of the inner cavity 22a of a circular annular sealing ring 22 is circular. Alternatively, the cross-sectional shape of the inner cavity 22a can not match the outer shape of the annular sealing ring 22; for example, the cross-sectional shape of the inner cavity 22a of a circular annular sealing ring 22 is square. The solid portion of the annular sealing ring 22 serves to seal, while the inner cavity 22a serves to connect. Since the annular sealing ring 22 is located between the outer side of the first cavity wall 111 and the working electrode 21, and is arranged around the periphery of the through hole 111a, it means that the annular... One end of the inner cavity 22a of the annular sealing ring 22 is connected to the through hole 111a, and the other end is covered by the working electrode 21. Therefore, the annular sealing ring 22 and the working electrode 21 form a cover-like structure, covering the through hole 111a. The cross-sectional area of the inner cavity 22a of the annular sealing ring 22 is also the test area of the working electrode 21. "The annular sealing ring 22 is detachably disposed between the outer side of the first cavity wall 111 and the working electrode 21" means that the annular sealing ring 22 is detachable from both the first cavity wall 111 and the working electrode 21. Based on this, the annular sealing ring 22 is a replaceable component in the electrode testing device 100. Specifically, multiple annular sealing rings 22 are provided, and the cross-sectional size of the inner cavity 22a of the multiple annular sealing rings 22 is gradually increased. They can be selectively disposed between the first cavity wall 111 and the working electrode 21 according to the different test area requirements. For example... Figure 4 and Figure 5 To set the state of the annular sealing ring 22 with different inner cavity 22a specifications, in Figure 4 In the middle, the cross-sectional dimension of the inner cavity 22a of the annular sealing ring 22 is larger than the cross-sectional dimension of the through hole 111a. Figure 5 In the case of the annular sealing ring 22, the cross-sectional dimension of the inner cavity 22a is smaller than the cross-sectional dimension of the through hole 111a.
[0071] In the above technical solution, the annular sealing ring 22 is detachably disposed between the outer side of the first cavity wall 111 and the working electrode 21. Since the annular sealing ring 22 is arranged around the periphery of the through hole 111a, the inner cavity 22a of the annular sealing ring 22 can be connected to the working electrode 21 through the through hole 111a. The cross-sectional area of the inner cavity 22a of the annular sealing ring 22 is directly related to the test area of the working electrode 21. By replacing the annular sealing ring 22 with different inner cavity sizes, the test area of the working electrode 21 can be adjusted.
[0072] There are several possibilities for the material of the annular seal 22. Specifically, the annular seal 22 is made of rubber.
[0073] Please see Figure 4 and Figure 5 In some embodiments, an installation groove 111b is provided on the outer side of the first cavity wall 111, and a through hole 111a is provided in the bottom wall of the installation groove 111b; an annular sealing ring 22 is accommodated in the installation groove 111b.
[0074] "The annular sealing ring 22 is accommodated in the mounting groove 111b" means that the annular sealing ring 22 is adapted to be disposed in the mounting groove 111b. According to the elastic characteristics of the annular sealing ring 22, the annular sealing ring 22 can be installed in the mounting groove 111b by means of interference fit, clearance fit or overfit. There can also be a certain gap between the peripheral sidewall of the annular sealing ring 22 and the inner sidewall of the mounting groove 111b, and the annular sealing ring 22 is allowed to move within a certain range in the mounting groove 111b. However, no matter how the annular sealing ring 22 moves, it should be ensured that its inner cavity 22a is at least partially connected to the through hole 111a.
[0075] In the above technical solution, an installation groove 111b is provided on the outer side of the first cavity wall 111, and the annular sealing ring 22 is accommodated in the installation groove 111b. The installation groove 111b plays a role in the installation and positioning of the annular sealing ring 22. During the installation of the working electrode assembly 2, an annular sealing ring 22 of appropriate specifications can be selected and placed in the installation groove 111b first, and then the working electrode 21 can be covered on the outer end of the annular sealing groove. This can reduce the probability of the annular sealing ring 22 deviating from the through hole 111a and ensure the accuracy of the test results.
[0076] Please see Figures 1 to 3 In some embodiments, the working electrode assembly 2 further includes a limiting plate 23, which is connected to the main structure 1 and abuts against the side of the working electrode 21 opposite to the through hole 111a.
[0077] The way in which the "limiting plate 23 is connected to the main structure 1" can be a fixed connection or a detachable connection. In the fixed connection scheme, the limiting plate 23 can be elastically set so that the working electrode 21 can be inserted between the limiting plate 23 and the first cavity wall 111.
[0078] In the above technical solution, the limiting plate 23 is connected to the main structure 1 and abuts against the working electrode 21, thereby applying pressure to the working electrode 21 toward the through hole 111a. Under the action of pressure, the working electrode 21 can be stably maintained at the position of the cover through hole 111a, while also limiting the assembly gap between the working electrode assembly 2 and the main structure 1, effectively suppressing the overflow of the test solution.
[0079] Please see Figure 4 and Figure 5 In some embodiments, an elastic buffer portion 5 is also provided between the limiting plate 23 and the working electrode 21.
[0080] "Elastic buffer 5" refers to a component with elastic properties and used for buffering. This elastic property can be reflected in the material, such as rubber, or in the structure, such as a spring structure. In this embodiment, the material and structure type of the elastic buffer 5 are not limited.
[0081] In the above technical solution, the presence of the elastic buffer part 5 can buffer the pressure applied to the working electrode 21 by the limiting plate 23, thereby reducing the probability of the working electrode 21 being crushed. At the same time, the elastic buffer part 5 can also store elastic potential energy to continuously provide sufficient pressure to the working electrode 21, ensuring the sealing effect between the working electrode assembly 2 and the main structure 1.
[0082] Please see Figure 4 and Figure 5 In some embodiments, the limiting plate 23 is provided with a limiting groove 23a, and the working electrode 21 is at least partially disposed in the limiting groove 23a.
[0083] It should be noted that the limiting groove 23a refers to a groove structure that is adapted to the shape of at least part of the structure of the working electrode 21 in order to limit the degree of freedom of the working electrode 21 on the limiting plate 23.
[0084] In the above technical solution, the function of the limiting groove 23a is to provide an installation base for the working electrode 21, ensuring that the working electrode 21 is stably maintained in the position corresponding to the through hole 111a, and further improving the limiting effect of the limiting plate 23 on the working electrode 21.
[0085] Please see Figure 1 and Figure 2 In some embodiments, the limiting groove 23a is disposed on one side of the limiting plate 23 along the thickness direction, and the port of the limiting groove 23a in its extension direction passes through the peripheral end of the limiting plate 23; the working electrode 21 is at least partially located outside the limiting groove 23a.
[0086] Since the limiting plate 23 abuts against the side of the working electrode 21 away from the through hole 111a, the thickness direction of the limiting plate 23 can also be understood as the direction towards the through hole 111a; "the limiting groove 23a is set on one side of the limiting plate 23 along the thickness direction", and considering that the limiting groove 23a is used for the working electrode 21, the limiting groove 23a should be located on the side of the limiting plate 23 closer to the through hole 111a; depending on the shape of the limiting plate 23, "the peripheral end of the limiting plate 23" can be the side end in the length direction of the limiting plate 23, or it can be the side end in the width direction of the limiting plate 23 (e.g., Figure 1 and Figure 2 As shown), it can also be the radial side end of the limiting plate 23; in this embodiment, the limiting groove 23a extends on one side of the limiting plate 23 and has a corresponding extending direction. The port of the limiting groove 23a in its extending direction passes through the peripheral side end of the limiting plate 23, so that the working electrode 21 can extend outward from the port of the limiting groove 23a, thereby being partially located outside the limiting groove 23a.
[0087] In the above technical solution, the working electrode 21 is at least partially located outside the limiting groove 23a, which is beneficial for the working electrode 21 to be connected to the test circuit of the electrode testing equipment. For example, it is beneficial for the conductive grippers of the test circuit to hold the working electrode 21, which reduces the difficulty of operation.
[0088] Please see Figure 1 and Figure 2 In some embodiments, the limiting plate 23 is disposed at the bottom of the main structure 1 and supports the main structure 1.
[0089] "The bottom of the main structure 1" refers to the fact that the main structure 1 is located at the bottom in the direction of gravity when the electrode testing device 100 is working; the setting of the limiting plate 23 supporting the main structure 1 means that when the electrode testing device 100 is placed on an external structure, such as a test platform, the limiting plate 23 directly contacts the external structure, thereby supporting the main structure 1 above itself.
[0090] In the above technical solution, since the test chamber 1a of the main structure 1 needs to contain the test solution and for the installation of the auxiliary electrode 3, its overall weight during the test process is relatively large. Setting the limiting plate 23 at the bottom of the main structure 1 can not only support the main structure 1, but also allow the main structure 1 to apply greater pressure to the working electrode assembly 2 due to its own large weight, thereby ensuring the sealing effect between the working electrode assembly 2 and the main structure 1.
[0091] Please see Figure 2 and Figure 3 In some embodiments, the bottom of the main structure 1 is provided with an overlapping plate 112; the limiting plate 23 is locked to the overlapping plate 112.
[0092] "Overlap plate 112" refers to a plate-like structure used to overlap with the limiting plate 23. It typically needs to extend laterally along the main structure 1 to provide sufficient overlap area for the limiting plate 23. The locking connection between the limiting plate 23 and the overlap plate 112 can be specifically achieved through... Figure 3 The bolt-locking structure 231 shown is implemented.
[0093] In the above technical solution, the lap plate 112 can provide a connection base for the limiting plate 23, and at the same time, it can also improve the support capacity of the limiting plate 23 and reduce the risk of the main structure 1 overturning. Locking the limiting plate 23 to the lap plate 112 can also reduce the installation difficulty of the working electrode 21 by disassembling and assembling the limiting plate 23.
[0094] Please see Figures 1 to 3 In some embodiments, the electrode testing device 100 further includes a reference electrode 4, which is at least partially disposed within the test chamber 1a for insertion into the test solution.
[0095] The function of the "reference electrode 4" is to provide a stable, known and reproducible potential reference point, so that the potential of the working electrode 21 can be accurately measured and controlled. Different types of test systems usually require different reference electrodes 4. In this embodiment, the composition of the reference electrode 4 is not limited.
[0096] In the above technical solution, the presence of the reference electrode 4, together with the working electrode 21 and the auxiliary electrode 3, constitutes a three-electrode testing system. Compared with the two-electrode testing system, the three-electrode testing system has higher potential control and potential measurement accuracy, and can more accurately obtain the electrochemical characteristics of the working electrode 21 (e.g., polarization, reaction kinetics, capacitance, etc.).
[0097] In some embodiments, the reference electrode 4 includes a Luggin capillary for insertion into the test solution.
[0098] Reference electrodes typically include a saturated calomel electrode and a silver / silver chloride electrode. The saturated calomel electrode consists of a solution of Hg, Hg₂Cl₂, and KCl, while the silver / silver chloride electrode consists of a solution of Ag, AgCl, and Cl₂. - The internal reference solution for both reference electrodes is a saturated potassium chloride solution. This internal reference solution is the core of the reference electrode, providing key ions (mainly Cl-) with constant activity for the electrode reaction. - The purity and concentration accuracy of the internal reference solution directly affect the accuracy and stability of the reference electrode potential. When the test solution contains ions incompatible with the internal reference solution (such as Ag),... + Hg + When using organic solvents, the internal reference solution may be contaminated or the liquid junction may be blocked. In this case, a dual-salt-bridge reference electrode is required. The Luggin capillary (outer salt bridge) is filled with an electrolyte solution (KNO3, NaSO4) compatible with the test solution and is located between the internal reference solution (inner salt bridge) and the test solution. The reference electrode 4 contacts the test solution through the Luggin capillary. The contact point is the liquid junction. A small amount of the internal reference solution seeps out through this liquid junction and forms an ion bond with the test solution, thus achieving ion conduction between the reference electrode and the test solution.
[0099] In the above technical solution, the micron-sized tip of the Lugin capillary causes less disturbance to the flow field and diffusion field in the test solution, which is beneficial to maintaining stable mass transfer conditions on the surface of the working electrode 21. By setting an electrolyte solution compatible with the test solution inside the Lugin capillary, ion conduction between the reference electrode 4 and the test solution can be achieved, which improves the problem that the internal solution of the reference electrode 4 is prone to contaminating the test solution. At the same time, it can also improve the problem that the test solution is prone to reverse contamination of the reference electrode 4.
[0100] Please see Figure 3 In some embodiments, the main structure 1 includes a base 11 and a cover 12. The cover 12 covers the opening of the base 11, and the cover 12 and the base 11 together define a test cavity 1a. The cover 12 is provided with a plurality of through holes 12a. The reference electrode 4 and the auxiliary electrode 3 pass through the corresponding through holes 12a. The first cavity wall 111 is disposed on the base 11.
[0101] It should be noted that the substrate 11 in this embodiment has a cavity with an opening, and the cover 12 covers the opening of the cavity, thereby defining the cavity as a test cavity 1a; the cover 12 is provided with multiple through holes 12a, and the reference electrode 4 and the auxiliary electrode 3 only need two corresponding through holes 12a for installation. In addition, the multiple through holes 12a may also include exhaust holes to balance the air pressure of the test cavity 1a with the external environment.
[0102] In the above technical solution, the main structure 1 is set to be formed by the base 11 and the cover 12 covering each other, which makes it convenient for the operator to inject and pour out the test solution into the test chamber 1a. The reference electrode 4 and the auxiliary electrode 3 are installed on the cover 12 through the corresponding through holes 12a, which helps to reduce the installation difficulty of the reference electrode 4 and the auxiliary electrode 3 and ensure the relative position accuracy of the reference electrode 4 and the auxiliary electrode 3.
[0103] Please see Figure 3 In some embodiments, the cover 12 is provided with a protrusion 121 on the side facing the base 11. The protrusion 121 is inserted into the opening of the base 11 and abuts against the inner wall of the base 11; the through hole 12a is provided through the protrusion 121.
[0104] In addition to the protrusion 121, the cover 12 usually also has an extension that overlaps with the opening edge of the base 11 to prevent the protrusion 121 from extending excessively into the opening of the base 11.
[0105] In the above technical solution, the protrusion 121 is inserted into the opening of the base 11 and abuts against the inner wall of the base 11. On the one hand, the protrusion 121 can serve as a positioning structure between the cover 12 and the base 11 to ensure that the cover 12 is accurately fitted onto the base 11. On the other hand, the protrusion 121 can also serve as a sealing structure between the cover 12 and the base 11 to improve the sealing performance of the main structure 1 and prevent the test solution from leaking and affecting the electrochemical test.
[0106] This application also proposes an electrode testing device, which includes an electrode testing apparatus 100. The specific structure of the electrode testing apparatus 100 is as described in the above embodiments. Since this electrode testing device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. In addition to the electrode testing apparatus 100, the electrode testing device usually also includes a test circuit. The test circuit is electrically connected to the working electrode 21, auxiliary electrode 3, and reference electrode 4 of the electrode testing apparatus 100 to provide a stable test current and test voltage.
[0107] In a specific embodiment of this application, the electrode testing device 100 includes a main structure 1, a working electrode 21, an auxiliary electrode 3, a reference electrode 4, an annular sealing ring 22, an elastic buffer portion 5, and a limiting plate 23. The main structure 1 includes a base 11 and a cover 12. The cover 12 covers the opening of the base 11, and the cover 12 and the base 11 together define a test cavity 1a. A protrusion 121 is provided on the side of the cover 12 facing the base 11. The protrusion 121 is inserted into the opening of the base 11 and abuts against the inner wall of the base 11. The substrate 11 contains a test solution. The cover 12 has multiple through holes 12a extending through the protrusion 121. The reference electrode 4 and the auxiliary electrode 3 pass through the corresponding through holes 12a and extend into the test solution within the test chamber 1a. The reference electrode 4 includes a Luggin capillary, inside which a salt bridge gel is disposed. The Luggin capillary extends into the test solution. One wall of the test chamber 1a is a first wall 111, located at the bottom wall of the substrate 11 and opposite to the cover 12. The first wall 111 is provided with... A through hole 111a is provided, and a mounting groove 111b is provided on the outer side of the first cavity wall 111. The through hole 111a is provided through the bottom wall of the mounting groove 111b. An annular sealing ring 22 is detachably accommodated in the mounting groove 111b and surrounds the periphery of the through hole 111a. The working electrode 21 is provided to cover the annular sealing ring 22 and is at least partially exposed in the through hole 111a for contact with the test solution in the test cavity 1a. The inner cavity 22a of the annular sealing ring 22 is replaceable. A limiting plate 23 is provided on the base. At the bottom of the base 11, an overlapping plate 112 is provided. A limiting plate 23 is connected to the overlapping plate 112 by a bolt locking structure 231 and supports the base 11. A limiting groove 23a is provided on one side of the limiting plate 23 along the thickness direction. The limiting groove 23a extends along the width direction of the limiting plate 23 and passes through the side end of the limiting plate 23. The working electrode 21 is partially located inside the limiting groove 23a and the rest is located outside the limiting groove 23a. An elastic buffer part 5 is provided between the working electrode 21 and the bottom wall of the limiting groove 23a.
[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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. 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 embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. An electrode testing device, characterized in that, include: The main structure has a test chamber for containing a test solution. One wall of the test chamber is a first wall, and the first wall has a through hole. as well as, A working electrode assembly is disposed on the outside of the first cavity wall and covers the through hole. The working electrode assembly includes a working electrode, which is at least partially exposed in the through hole for contact with the test solution in the test cavity. as well as, An auxiliary electrode is at least partially disposed within the test chamber for insertion into the test solution.
2. The electrode testing device as described in claim 1, characterized in that, The working electrode assembly also includes an annular sealing ring, which is detachably disposed between the outer side of the first cavity wall and the working electrode, and the annular sealing ring is arranged around the periphery of the through hole.
3. The electrode testing device as described in claim 2, characterized in that, An installation groove is provided on the outer side of the first cavity wall, and the through hole is provided through the bottom wall of the installation groove; The annular sealing ring is accommodated in the mounting groove.
4. The electrode testing device as described in claim 1, characterized in that, The working electrode assembly also includes a limiting plate, which is connected to the main structure and abuts against the side of the working electrode opposite to the through hole.
5. The electrode testing apparatus as described in claim 4, characterized in that, An elastic buffer is also provided between the limiting plate and the working electrode.
6. The electrode testing apparatus as described in claim 4, characterized in that, The limiting plate is provided with a limiting groove, and the working electrode is at least partially disposed in the limiting groove.
7. The electrode testing apparatus as described in claim 6, characterized in that, The limiting groove is disposed on one side of the limiting plate along the thickness direction, and the port of the limiting groove in its extension direction passes through the side end of the limiting plate. The working electrode is located at least partially outside the limiting groove.
8. The electrode testing apparatus as described in claim 4, characterized in that, The limiting plate is located at the bottom of the main structure and supports the main structure.
9. The electrode testing apparatus as described in claim 8, characterized in that, The bottom of the main structure is provided with an overlapping plate; The limiting plate is locked to the overlapping plate.
10. The electrode testing apparatus according to any one of claims 1 to 9, characterized in that, The electrode testing device further includes a reference electrode, which is at least partially disposed within the testing chamber and is used to extend into the testing solution.
11. The electrode testing apparatus as described in claim 10, characterized in that, The reference electrode includes a Luggin capillary tube for insertion into the test solution.
12. The electrode testing apparatus as described in claim 10, characterized in that, The main structure includes a base and a cover. The cover is disposed over the opening of the base. The cover and the base together define the test cavity. The cover is provided with multiple through holes. The reference electrode and the auxiliary electrode are disposed in the corresponding through holes; The first cavity wall is disposed on the substrate.
13. The electrode testing apparatus as described in claim 12, characterized in that, The cover has a protrusion on the side facing the base. The protrusion is inserted into the opening of the base and abuts against the inner wall of the base. The through hole passes through the protrusion.
14. An electrode testing device, characterized in that, Includes the electrode testing apparatus as described in any one of claims 1 to 13.