A double-sealed multifunctional electrochemical testing device and its assembly and use method

Abstract

The present invention belongs to the field of electrochemical testing technology, and specifically relates to a double-sealed multifunctional electrochemical testing device and its assembly and use method. The device specifically includes: an insulating corrosion-resistant mold with a cavity, one side of the insulating corrosion-resistant mold cavity is sequentially provided with a detachable first electrolyte insulating seal ring, a first electrode, a first air seal ring, and a first conductive electrode ear; the other side of the insulating corrosion-resistant mold cavity is sequentially provided with a detachable second electrolyte insulating seal ring, a second electrode, a second air seal ring, and a second conductive electrode ear; the upper side of the insulating corrosion-resistant mold cavity is provided with an injection hole, and the injection hole is sequentially provided with a third electrolyte insulating seal ring and a sealing cover; the sealing cover is fixedly provided with a third electrode that penetrates. While ensuring the sealing and reliability of the entire system, it also has the characteristics of simple structure, high operability, easy disassembly and cleaning, reusability, and multifunctionality.

Description

Technical Field

[0001] The invention belongs to the technical field of electrochemical testing, and in particular relates to a double-sealed multifunctional electrochemical testing device and an assembling and using method thereof. Background Art

[0002] In the process of developing new materials, the study of the physical and chemical properties of materials plays a vital role, among which the study of chemical properties has a guiding significance for the material preparation process, stability and application. More specifically, the electrochemical performance test of materials is an important and indispensable means for their electrochemical research and application.

[0003] In the process of testing the electrochemical properties of materials, the three-electrode system and the two-electrode system are the two most commonly used test systems. The three-electrode system includes a working electrode for electrochemical reactions, a counter electrode for providing a current loop, and a reference electrode for providing a stable electrode potential during the test. The working electrode refers to the electrode studied during the experiment, often including a glassy carbon electrode, a platinum electrode, a gold electrode, or an electrode made of the material being studied; the counter electrode refers to an electrode that forms a current loop with the working electrode without affecting the reaction of the entire system, and is made of materials that must remain inert in the research system, including silver, nickel, tungsten, platinum and other materials; the reference electrode is made of a material with a known electrode potential, and its electrode potential is not affected in the entire reaction system. Commonly used reference electrodes include silver / silver chloride electrodes, calomel electrodes, silver / silver ion electrodes, lithium / lithium ion electrodes, etc. During the test, if the electrode potential of the counter electrode does not change or the change is negligible, the reference electrode can be omitted or the counter electrode can be used as a reference electrode at the same time. This system is a two-electrode system. Through three-electrode or two-electrode testing, the electrochemical performance data such as the redox potential / current, working voltage, energy density, power density, mass transfer, adsorption and reversibility of electrochemical reactions of electrode materials or electrolytes can be obtained, and the comparison, analysis and research of these data can be used to study the characteristics of electrode materials and electrolytes in depth and effectively from a theoretical perspective. According to these characteristics, in the process of designing electrochemical systems and devices, their energy density, working voltage, rate performance, high and low temperature performance, corrosion resistance, etc. can be improved in a targeted manner. Therefore, an electrochemical testing device with stable performance, reliability and easy operation is extremely important for the study of the electrochemical properties of materials.

[0004] The utility model (CN 201320416874.6) discloses a three-electrode system electrochemical test device, the structure of which includes a main box body composed of an outer cavity for liquid injection and an inner cavity, the inner cavity is provided with a cover plate for fixing the working electrode, the counter electrode and the reference electrode, the cover plate is provided with two circular holes and a strip hole, the circular hole is used to fix the auxiliary electrode and the reference electrode, and the strip hole is provided with a lead screw adjustment device for fixing the working electrode, the test system can achieve simple operation and convenient testing. However, the device only uses the method of opening holes on the cover plate to fix the working electrode, the reference electrode and the counter electrode, so the air tightness is poor and cannot be used to test electrochemical reactions sensitive to air.

[0005] The invention (CN201810415665.7) discloses a novel three-electrode system electrochemical test device and method, which includes a fixed base, a cylindrical device housing, an electrochemical device back cover, a working electrode, an auxiliary electrode, a reference electrode and a pointer thermometer. The working electrode and the reference electrode are fixed in the back cover of the device and sealed with silicone. After the electrolyte is added through the cavity, the working electrode is inserted into the cavity of the injection to achieve sealing. Although the device realizes that the solution is only in contact with one surface of the working electrode and the reference electrode, and not in contact with the other surface (the electrode is immersed in the electrolyte), thereby avoiding the side reaction of the wiring immersed in the electrolyte, the problem that the other side of the electrode that is easy to react with air, such as lithium metal, cannot be exposed to the air has not been solved. At the same time, using silicone to seal the entire system may meet the sealing requirements in a short time, but long-term testing or under conditions of frequent movement will cause the airtightness to decrease, so that the test data obtained will have a large deviation. In addition, most traditional three-electrode test devices insert three electrodes into the solution. The relative position deviation of each operation is different, and the test results are different. On the other hand, although some three-electrode test devices have a certain degree of sealing, the numerous components and complex assembly test steps greatly affect the reliability and operability of the equipment. Furthermore, the electrode positions of these three-electrode test devices are relatively fixed, which greatly limits the test methods and application scope of the device.

[0006] The main problems of current electrochemical testing devices include complex structure, poor airtightness, poor consistency of test results, single function, etc. These defects have led to great limitations on the accuracy, repeatability and operability of the current electrochemical testing devices. Therefore, in view of the above technical problems of complex structure, poor airtightness, poor consistency of test results and single function, it is urgent to design and manufacture an electrochemical testing device with simple structure, good airtightness, strong operability, stable performance and multifunctionality and its assembly and use method. Summary of the invention

[0007] The first object of the present invention is to provide a double-sealed multifunctional electrochemical testing device.

[0008] A second object of the present invention is to provide an assembly method of a double-sealed multifunctional electrochemical testing device.

[0009] The first object of the present invention is achieved as follows: the device specifically includes: an insulating corrosion-resistant mold 1 with a cavity 12, one side of the cavity 12 of the insulating corrosion-resistant mold 1 is sequentially provided with a removable first electrolyte insulating sealing ring 801, a first electrode 2, a first air sealing ring 901, and a first conductive electrode ear 3; the other side of the cavity 12 of the insulating corrosion-resistant mold 1 is sequentially provided with a removable second electrolyte insulating sealing ring 802, a second electrode 4, a second air sealing ring 902, and a second conductive electrode ear 5; an injection hole 11 is provided on the upper side of the cavity 12 of the insulating corrosion-resistant mold 1, and a third electrolyte insulating sealing ring 803 and a sealing cover 7 are sequentially provided on the injection hole 11; a third electrode 6 is fixedly provided through the sealing cover 7.

[0010] The second object of the present invention is achieved in this way: the assembly method specifically comprises the following steps:

[0011] Step 1: placing the first electrolyte insulating seal ring 801, the first electrode 2, the first air seal ring 901 and the first conductive electrode ear 3 in sequence on the insulating corrosion-resistant mold 1 provided with the cavity 12, and fixing and pressing them by bolts 10;

[0012] Step 2: placing the second electrolyte insulating seal ring 802, the second electrode 4, the second air seal ring 902 and the second conductive electrode ear 5 in sequence on the insulating corrosion-resistant mold 1 provided with the cavity 12, and fixing and pressing them by bolts 10;

[0013] Step 3: injecting electrolyte into the cavity 12 through the injection hole 11, so that the electrolyte submerges the first electrode 2 and the second electrode 4;

[0014] Step 4: Place the third electrolyte insulating sealing ring 803 in the injection hole 11, and tighten the sealing cover 7 tightly connected to the third electrode 6, so that the entire system is sealed, and the electrode surface of the third electrode 6 is located in the center of the cavity 12 and on the same horizontal line as the centers of the first electrode 2 and the second electrode 4;

[0015] Step 5: Connect the instrument or device to the first conductive electrode lug 3, the second conductive electrode lug 5 and the third electrode 6 respectively, and perform real-time testing at the required temperature.

[0016] The present invention provides a double-sealed multifunctional electrochemical testing device and an assembly and use method thereof. A first electrode 2, a second electrode 4, a third electrode 6, an electrolyte insulating sealing ring 8 and an air sealing ring 9 can be compressed and fixed through a flexibly disassembled mold 1 with a cavity 12. Each part can be freely disassembled and adjusted independently of each other. While ensuring the sealing and reliability of the entire system, it also has the characteristics of simple structure, high operability, easy disassembly and cleaning, and reusability.

[0017] The centers of the first electrode 2 and the second electrode 4 are on the same horizontal line, and the electrode surface of the third electrode 6 is located at the exact center of this horizontal line, which can fully ensure that the spatial positions of the three are at fixed positions during each test, and can fully ensure the consistency and reliability of the test.

[0018] The mold 1 is made of a material that is electrically insulating, electrochemically inert, and has excellent mechanical strength, does not react with the electrolyte, and has stable performance, thereby ensuring the accuracy of the test results.

[0019] The electrolyte only contacts the reaction surfaces of the first electrode 2 , the second electrode 4 and the third electrode 6 , but does not contact the current collector connected to the external circuit, thereby ensuring the accuracy of the test results.

[0020] The first conductive electrode tab 3 and the second conductive electrode tab 5 are not in contact with the electrolyte, thereby ensuring that the conductive electrode tabs will not react during the test, ensuring the accuracy of the test results, and effectively extending the service life of the entire system.

[0021] Furthermore, the device of the present invention has double sealing properties, which can ensure that the side of the first electrode 2 and the second electrode 4 that is not in contact with the electrolyte is also not in contact with the air, and can also more effectively prevent air from entering the electrolyte, thereby ensuring the accuracy of the test results.

[0022] The electrolyte is added through the injection hole 11, and the amount of the added electrolyte can be adjusted by adjusting the size of the cavity, thereby ensuring that the required performance can be accurately measured under the condition of a very small amount of electrolyte.

[0023] It can be used for both three-electrode system testing and two-electrode system testing, and has a wide range of application functions.

[0024] The first electrode 2, the second electrode 4 and the third electrode 6 can be flexibly changed to meet the requirements of different test purposes.

[0025] It can be used for testing electrolytes as well as electrode materials. It is a comprehensive electrochemical research system.

[0026] In summary, the electrochemical testing device and the assembly and use method thereof of the present invention have the characteristics of simple structure, good airtightness, strong operability, stable performance and multi-function. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a side cross-sectional view of a double-sealed multifunctional electrochemical testing device of the present invention;

[0028] FIG2 is a three-dimensional schematic diagram of the components and assembly relationship of a double-sealed multifunctional electrochemical testing device of the present invention;

[0029] FIG3 is a cyclic voltammetry curve of a three-electrode system of the device of the present invention used to test a conventional electrolyte;

[0030] FIG4 is a cyclic voltammetry curve of the three-electrode system of the device of the present invention used to test the conventional electrolyte after adding the negative electrode additive;

[0031] FIG5 is a cyclic voltammetry curve of a three-electrode system of the device of the present invention used to test a conventional electrolyte;

[0032] FIG6 is a cyclic voltammetry curve of the three-electrode system of the device of the present invention used to test the conventional electrolyte after adding the positive electrode additive;

[0033] FIG7 is a cyclic voltammetry curve of the three-electrode system of the device of the present invention used to test the positive electrode material of a lithium-ion battery;

[0034] FIG8 is a cyclic voltammetry curve of the three-electrode system of the device of the present invention used to test the negative electrode material of a lithium-ion battery;

[0035] FIG9 is a cyclic voltammetry curve of a two-electrode system of the device of the present invention used to test a positive electrode material of a lithium-ion battery;

[0036] FIG10 is a cyclic voltammetry curve of the two-electrode system of the device of the present invention used to test the negative electrode material of a lithium-ion battery;

[0037] FIG11 is a schematic flow chart of a method for assembling and using a double-sealed multifunctional electrochemical testing device according to the present invention;

[0038] In the figure:

[0039] 1-mold; 2-first electrode; 3-first conductive electrode ear; 4-second electrode; 5-second conductive electrode ear; 6-third electrode; 7-sealing cover; 8-electrolyte insulating sealing ring; 801-first electrolyte insulating sealing ring; 802-second electrolyte insulating sealing ring; 803-third electrolyte insulating sealing ring; 9-air sealing ring; 901-first air sealing ring; 902-second air sealing ring; 10-bolt; 11-liquid injection hole; 12-cavity. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can understand the present invention in detail, but the present invention is not limited in any way. Any changes or improvements made based on the technical enlightenment of the present invention belong to the protection scope of the present invention.

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] like Figure 1~2 As shown, the present invention provides a double-sealed multifunctional electrochemical testing device, which specifically includes: an insulating corrosion-resistant mold 1 with a cavity 12, one side of the cavity 12 of the insulating corrosion-resistant mold 1 is provided with a detachable first electrolyte insulating sealing ring 801, a first electrode 2, a first air sealing ring 901, and a first conductive electrode ear 3 in sequence; the other side of the cavity 12 of the insulating corrosion-resistant mold 1 is provided with a detachable second electrolyte insulating sealing ring 802, a second electrode 4, a second air sealing ring 902, and a second conductive electrode ear 5 in sequence; an injection hole 11 is provided on the upper side of the cavity 12 of the insulating corrosion-resistant mold 1, and a third electrolyte insulating sealing ring 803 and a sealing cover 7 are provided on the injection hole 11 in sequence; a third electrode 6 is fixedly provided through the sealing cover 7.

[0043] The detachable connection is specifically a fixed and compressed connection through bolts 10 .

[0044] The third electrode 6 and the sealing cover 7 are arranged coaxially.

[0045] The first electrode 2 is specifically a counter electrode, or a working electrode, or a reference electrode; the second electrode 4 is specifically a reference electrode, or a counter electrode, or a working electrode; the third electrode 6 is specifically a working electrode, or a reference electrode, or a counter electrode.

[0046] The material used to prepare the sealing cover 7 has electrical insulation, excellent mechanical properties, and no electrochemical activity.

[0047] The material used to prepare the insulating corrosion-resistant mold 1 provided with the cavity 12 has electrical insulation, excellent mechanical properties, and no electrochemical activity.

[0048] The first conductive electrode tab 3 is made of a metal with high strength and high electrical conductivity; the second conductive electrode tab 5 is made of a metal with high strength and high electrical conductivity.

[0049] The material used to prepare the first electrode 2 has electrochemical inertness and high electrical conductivity; the material used to prepare the third electrode 6 has electrochemical inertness and high electrical conductivity.

[0050] The lower end surface of the third electrode 6 and the center point of the cavity 12 , the center point of the first electrode 2 , and the center point of the second electrode 4 are on the same horizontal line.

[0051] The present invention also provides an assembly method of a double-sealed multifunctional electrochemical testing device, the assembly method specifically comprising the following steps:

[0052] Step 1: placing the first electrolyte insulating seal ring 801, the first electrode 2, the first air seal ring 901 and the first conductive electrode ear 3 in sequence on the insulating corrosion-resistant mold 1 provided with the cavity 12, and fixing and pressing them by bolts 10;

[0053] Step 2: placing the second electrolyte insulating seal ring 802, the second electrode 4, the second air seal ring 902 and the second conductive electrode ear 5 in sequence on the insulating corrosion-resistant mold 1 provided with the cavity 12, and fixing and pressing them by bolts 10;

[0054] Step 3: injecting electrolyte into the cavity 12 through the injection hole 11, so that the electrolyte submerges the first electrode 2 and the second electrode 4;

[0055] Step 4: Place the third electrolyte insulating sealing ring 803 in the injection hole 11, and tighten the sealing cover 7 tightly connected to the third electrode 6, so that the entire system is sealed, and the electrode surface of the third electrode 6 is located in the center of the cavity 12 and on the same horizontal line as the centers of the first electrode 2 and the second electrode 4;

[0056] Step 5: Connect the instrument or device to the first conductive electrode lug 3, the second conductive electrode lug 5 and the third electrode 6 respectively, and perform real-time testing at the required temperature.

[0057] Specifically, in the embodiment of the present invention, the first electrode 2 is the counter electrode, the second electrode 4 is the reference electrode, the third electrode 4 is the working electrode, the first conductive electrode lug 3 is the conductive electrode lug in close contact with the counter electrode, that is, the counter electrode conductive electrode lug, and the second conductive electrode lug 5 is the conductive electrode lug in close contact with the reference electrode, that is, the reference electrode conductive electrode lug.

[0058] That is to say, a double-sealed multifunctional electrochemical testing device comprises: an insulating corrosion-resistant mold 1 provided with a cavity 12, a counter electrode and a conductive electrode ear in close contact with the counter electrode, a reference electrode and a conductive electrode ear in close contact with the reference electrode, and an electrolyte insulating sealing ring 8 to realize a semi-sealed cavity, and then the counter electrode and the reference electrode are isolated from the outside air by an air sealing ring 9, and the counter electrode conductive electrode ear and the reference electrode conductive electrode ear are fixed by bolts 10, a certain amount of electrolyte is added to the semi-sealed cavity 12 through a liquid injection hole 11, and finally a sealing cover 7 connected to the working electrode is tightened to be in close contact with the electrolyte insulating sealing ring 8 to realize a fully sealed state of the entire system, and tests are respectively performed on the counter electrode conductive electrode ear, the reference electrode conductive electrode ear and the working electrode terminal wiring.

[0059] The insulating corrosion-resistant mold 1 with the cavity 12 and the sealing cover 7 tightly connected to the working electrode are made of electrically insulating and electrochemically inactive materials with excellent mechanical properties; the counter electrode conductive lug and the reference electrode conductive lug are made of high-strength and high-conductivity metals.

[0060] The counter electrode is made of a material with electrochemical inertness and high conductivity, and is in contact with the electrolyte on only one side through the electrolyte insulating seal ring 8, while the other side is tightly connected to the counter electrode conductive ear.

[0061] The counter electrode conductive ear is used to squeeze the air sealing ring 9 to isolate the counter electrode from the outside air, and the counter electrode conductive ear is used to squeeze the counter electrode and electrolyte insulating sealing ring 8 to prevent the electrolyte from penetrating to the other side of the counter electrode conductive ear.

[0062] The reference electrode is composed of an electrode pair with a stable electrode potential in the test system, and is in close contact with the electrolyte insulating seal ring 8 so that only one side is in contact with the electrolyte, while the other side is closely connected to the reference electrode conductive ear.

[0063] The reference electrode is isolated from the outside air by squeezing the air sealing ring 9 by the reference electrode conductive ear, and the reference electrode and electrolyte insulating sealing ring 8 are squeezed by the reference electrode conductive ear to prevent the electrolyte from penetrating to the other side of the reference electrode conductive ear.

[0064] The working electrode for electrochemical reaction is made of a material with electrochemical inertness and high conductivity, or is prepared from a material under study, and is fixed on a sealing cover 7 with threads.

[0065] Electrolyte is added into the electrolyte cavity 12 through the injection hole 11 at the top, so that the electrolyte can submerge the counter electrode and the reference electrode.

[0066] The working electrode is tightly connected to the sealing cover 7, and the entire system is sealed by tightening and squeezing the electrolyte insulating sealing ring 8. The electrode surface of the working electrode is just at the center of the electrolyte cavity 12 and is on the same horizontal line as the center of the counter electrode and the reference electrode.

[0067] The device can be used for testing a three-electrode system or a two-electrode system. To meet different test purposes, the counter electrode, reference electrode and working electrode can be replaced as needed. The device can be used for the study of electrolytes or the study of electrode materials.

[0068] In other words, in the embodiment of the present invention, the device comprises, in sequence, a mold 1 provided with an electrolyte cavity, a counter electrode, a reference electrode, and a working electrode, the counter electrode and the reference electrode are respectively on both sides of the electrolyte cavity 12 and in close contact with the electrolyte insulating sealing ring 8, the counter electrode conductive ear is in close contact with the counter electrode and the air sealing ring 9 at the same time, the reference electrode conductive ear is in close contact with the reference electrode and the air sealing ring 9 at the same time, the fastening bolt 10 is used to connect the counter electrode conductive ear and the reference electrode conductive ear, the working electrode is closely connected with the threaded sealing cover 7, the injection hole 11 has threads, the sealing cover 7 is in close contact with the electrolyte insulating sealing ring 8, the electrolyte cavity 12 is directly below the injection hole 11, and the centers of the counter electrode and the reference electrode, the electrode surface of the working electrode, and the center of the electrolyte cavity 12 are located at the same position.

[0069] The mold 1 with the cavity and the sealing cover 7 are made of electrically insulating, electrochemically inert materials with excellent mechanical strength, such as polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), high-density polyethylene (HDPE), or polymethyl methacrylate (PMMA), etc. The material can be adjusted according to the chemical properties of the electrolyte used in the test.

[0070] The counter electrode is made of a material with electrochemical inertness and high conductivity, such as precious metals (such as platinum, gold, etc.) or carbon materials, etc., and a suitable material can be selected according to usage requirements.

[0071] The reference electrode is composed of an electrode pair with a stable electrode potential in the test system, such as a silver / silver chloride electrode, a calomel electrode, a silver / silver ion electrode, a lithium / lithium ion electrode, or a metal / metal oxide electrode, etc. A suitable reference electrode can be selected according to usage requirements.

[0072] The counter electrode conductive lug and the reference electrode conductive lug are made of metal with high strength and high conductivity, such as copper, gold-plated copper, stainless steel, aluminum, or aluminum alloy.

[0073] The working electrode is made of a material with electrochemical inertness and high conductivity, such as precious metals (such as platinum, gold, etc.), or carbon materials, or is prepared from research materials. Appropriate electrode materials can be selected according to usage requirements.

[0074] The electrolyte insulating seal ring 8 and the air seal ring 9 are made of chemically inert flexible materials, such as polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), rubber, or high-density polyethylene (HDPE), etc. The fastening bolt 10 is made of high-strength stainless steel, aluminum alloy, or PEEK, etc.

[0075] A method for assembling and using a double-sealed multifunctional electrochemical testing device is specifically performed in the following steps:

[0076] Step 1 (S1): The electrolyte insulating seal ring 8, the counter electrode, the air seal ring 9 and the counter electrode conductive ear are sequentially placed on the insulating corrosion-resistant mold 1 provided with the electrolyte cavity 12 and fixed and pressed by bolts 10.

[0077] Step 2 (S2): placing the electrolyte insulating seal ring 8, reference electrode, air seal ring 9 and reference electrode conductive lug in sequence on the insulating corrosion-resistant mold 1 provided with the electrolyte cavity 12 and fixing and pressing them by bolts 10.

[0078] Step three (S3): inject a certain amount of electrolyte into the cavity 12 through the injection hole 11, so that the electrolyte submerges the counter electrode and the reference electrode.

[0079] Step 4 (S4): Place the electrolyte insulating sealing ring 8 in the injection hole 11, and tighten the sealing cover 7 tightly connected to the working electrode to ensure the sealing of the entire system, while making the electrode surface of the working electrode exactly in the center of the cavity 12 and on the same horizontal line with the centers of the counter electrode and the reference electrode.

[0080] Step five (S5): Connect the instrument or device to the counter electrode conductive lug, the reference electrode conductive lug and the working electrode respectively, and test at a desired temperature.

[0081] Embodiment 1:

[0082] The cyclic voltammetry curve of conventional electrolyte tested by the device of the present invention using a three-electrode system:

[0083] 1. Place an electrolyte insulating sealing ring 8 into a mold 1 provided with a cavity, and then place the platinum sheet counter electrode 2 in close contact with the electrolyte insulating sealing ring 8;

[0084] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the platinum counter electrode 2 and the air sealing ring 9;

[0085] 3. Use the fastening bolts 10 to fix the counter electrode conductor ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the platinum counter electrode 2;

[0086] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0087] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into close contact with the lithium sheet reference electrode 4 and the air sealing ring 9;

[0088] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the lithium sheet reference electrode 4;

[0089] 7. Add 0.8 mL of conventional electrolyte (1 M LiPF6 - EC / DMC / EMC (1:1:1)) into the electrolyte cavity 12 through the injection hole 11;

[0090] 8. Put the electrolyte insulating sealing ring 8 on the glassy carbon working electrode 6, and then screw the sealing cover 7 tightly connected to the glassy carbon working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the glassy carbon electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line as the center of the counter electrode 2 and the reference electrode 4;

[0091] 9. Connect the instrument and the equipment to the counter electrode conductive electrode ear 3, the reference electrode conductive electrode ear 5, and the glassy carbon working electrode 6 respectively, and then perform a cyclic voltammetry test on the electrolyte at room temperature in the voltage range of 0 to 3.5 V at a scanning speed of 0.5 mV / s;

[0092] 10. Test results: Figure 3 is the cyclic voltammetry curve of conventional electrolyte;

[0093] 11. Result analysis: In the first cycle, the conventional electrolyte showed a reduction peak at 0.49 V. In the second and third cycles, the reduction peak disappeared, indicating that the reduction product of the electrolyte on the working electrode has formed a protective film.

[0094] Embodiment 2:

[0095] The cyclic voltammetry curve of the conventional electrolyte after adding the negative electrode additive is tested by the device of the present invention using a three-electrode system:

[0096] 1. Place an electrolyte insulating sealing ring 8 into a mold 1 provided with a cavity, and then place the platinum sheet counter electrode 2 in close contact with the electrolyte insulating sealing ring 8;

[0097] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the platinum counter electrode 2 and the air sealing ring 9;

[0098] 3. Use the fastening bolts 10 to fix the counter electrode conductor ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the platinum counter electrode 2;

[0099] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0100] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into it so that it is in close contact with the lithium sheet reference electrode 4 and the air sealing ring 9;

[0101] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the lithium sheet reference electrode 4;

[0102] 7. Add 0.8 mL of conventional electrolyte with negative electrode additives into the electrolyte cavity 12 through the injection hole 11;

[0103] 8. Put the electrolyte insulating sealing ring 8 on the glassy carbon working electrode 6, and then screw the sealing cover 7 tightly connected to the glassy carbon working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the glassy carbon electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line as the center of the counter electrode 2 and the reference electrode 4;

[0104] 9. Connect the instrument and the equipment to the counter electrode conductive electrode ear 3, the reference electrode conductive electrode ear 5, and the glassy carbon working electrode 6 respectively, and then perform a cyclic voltammetry test on the electrolyte at room temperature in the voltage range of 0 to 3.5 V at a scanning speed of 0.5 mV / s;

[0105] 10. Test results: Figure 4 is the cyclic voltammetry curve of a conventional electrolyte containing a negative electrode additive;

[0106] 11. Result analysis: In the first cycle, in addition to the 0.57 V reduction peak of the conventional electrolyte, the conventional electrolyte containing the negative electrode additive showed a new reduction peak at a more positive voltage (1.95 V). In the second cycle, these two reduction peaks weakened, and in the third cycle, both reduction peaks disappeared completely, indicating that the reduction product of the electrolyte on the working electrode has formed a protective film. In particular, since the negative electrode additive is easier to reduce, it is easier to form a more stable protective film on the working electrode.

[0107] Embodiment 3:

[0108] The cyclic voltammetry curve of conventional electrolyte tested by the device of the present invention using a three-electrode system:

[0109] 1. Place an electrolyte insulating sealing ring 8 into a mold 1 provided with a cavity, and then place the platinum sheet counter electrode 2 in close contact with the electrolyte insulating sealing ring 8;

[0110] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the platinum counter electrode 2 and the air sealing ring 9;

[0111] 3. Use the fastening bolts 10 to fix the counter electrode conductor ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the platinum counter electrode 2;

[0112] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0113] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into it so that it is in close contact with the lithium sheet reference electrode 4 and the air sealing ring 9;

[0114] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the lithium sheet reference electrode 4;

[0115] 7. Add 0.8 mL of conventional electrolyte into the electrolyte cavity 12 through the injection hole 11;

[0116] 8. Put the electrolyte insulating sealing ring 8 on the glassy carbon working electrode 6, and then screw the sealing cover 7 tightly connected to the glassy carbon working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the glassy carbon electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line as the center of the counter electrode 2 and the reference electrode 4;

[0117] 9. Connect the instrument and equipment to the counter electrode conductive lug 3, the reference electrode conductive lug 5, and the glassy carbon working electrode 6 respectively, and then perform a cyclic voltammetry test on the electrolyte at room temperature, in the voltage range of 3~7 V, at a scanning speed of 5 mV / s.

[0118] 10. Test results: Figure 5 is the cyclic voltammetry curve of conventional electrolyte;

[0119] 11. Result analysis: Figure 5 It can be seen from the cyclic voltammetry curves that with the increase in the number of cycles, the stable electrochemical window of the electrolyte gradually narrows (first cycle: 6.50 V, second cycle: 6.45 V, third cycle: 6.40 V), indicating the continuous decomposition and instability of the conventional electrolyte.

[0120] Embodiment 4:

[0121] The cyclic voltammetry curve of a conventional electrolyte containing a positive electrode additive is tested using the device of the present invention using a three-electrode system:

[0122] 1. Place an electrolyte insulating sealing ring 8 into a mold 1 provided with a cavity, and then place the platinum sheet counter electrode 2 in close contact with the electrolyte insulating sealing ring 8;

[0123] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the platinum counter electrode 2 and the air sealing ring 9;

[0124] 3. Use the fastening bolts 10 to fix the counter electrode conductor ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the platinum counter electrode 2;

[0125] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0126] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into it so that it is in close contact with the lithium sheet reference electrode 4 and the air sealing ring 9;

[0127] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the lithium sheet reference electrode 4;

[0128] 7. Add 0.8 mL of a conventional electrolyte containing a positive electrode additive into the electrolyte cavity 12 through the injection hole 11;

[0129] 8. Put the electrolyte insulating sealing ring 8 on the glassy carbon working electrode 6, and then screw the sealing cover 7 tightly connected to the glassy carbon working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the glassy carbon electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line as the center of the counter electrode 2 and the reference electrode 4;

[0130] 9. Connect the instrument and equipment to the counter electrode conductive lug 3, the reference electrode conductive lug 5, and the glassy carbon working electrode 6 respectively, and then perform a cyclic voltammetry test on the electrolyte at room temperature, in the voltage range of 3~7 V, at a scanning speed of 5 mV / s.

[0131] 10. Test results: Figure 6 is the cyclic voltammetry curve of a conventional electrolyte containing a positive electrode additive;

[0132] 11. Result analysis: Figure 6From the cyclic voltammetry curve, it can be seen that the conventional electrolyte containing the positive electrode additive has preferential oxidation of the additive at 4.25 V, and its oxidation current gradually decreases with the increase of the number of cycles, indicating that the oxidation product of the additive on the working electrode gradually forms a protective film. At the same time, with the increase of the number of cycles, the stable electrochemical window of the electrolyte gradually widens (first cycle: 6.15 V, second cycle: 6.40 V, third cycle: 6.60 V), indicating that the protective film formed by the oxidation product of the positive electrode additive on the working electrode can inhibit the further decomposition of the electrolyte and improve its stability.

[0133] Embodiment 5:

[0134] The cyclic voltammetry curve of the positive electrode material of a lithium-ion battery tested by the device of the present invention using a three-electrode system:

[0135] 1. Place an electrolyte insulating sealing ring 8 into a mold 1 provided with a cavity, and then place the platinum sheet counter electrode 2 in close contact with the electrolyte insulating sealing ring 8;

[0136] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the platinum counter electrode 2 and the air sealing ring 9;

[0137] 3. Use the fastening bolts 10 to fix the counter electrode conductor ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the platinum counter electrode 2;

[0138] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0139] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into it so that it is in close contact with the lithium sheet reference electrode 4 and the air sealing ring 9;

[0140] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the lithium sheet reference electrode 4;

[0141] 7. Add 0.8 mL of conventional electrolyte into the electrolyte cavity 12 through the injection hole 11;

[0142] 8. Put the electrolyte insulating sealing ring 8 on the platinum working electrode 6 coated with the positive electrode material of the lithium-ion battery, and then screw the sealing cover 7 tightly connected to the working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the working electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line as the center of the counter electrode 2 and the reference electrode 4;

[0143] 9. Connect the instrument and the equipment to the counter electrode conductive electrode ear 3, the reference electrode conductive electrode ear 5, and the working electrode 6 respectively, and then perform a cyclic voltammetry test at room temperature within a voltage range of 2 to 4.2 V at a scanning speed of 0.05 mV / s;

[0144] 10. Test results: Figure 7 Cyclic voltammetry curve of positive electrode material for lithium-ion battery;

[0145] 11. Result analysis: Figure 7 It can be seen from the cyclic voltammetry curve that the positive electrode material has an obvious oxidation peak at 3.60 V during the positive scan, and an obvious reduction peak at 3.27 V during the negative scan, indicating the typical lithium de-lithiation (oxidation) and lithium insertion (reduction) process of the positive electrode material.

[0146] Embodiment 6:

[0147] The cyclic voltammetry curve of the negative electrode material of a lithium-ion battery tested by the device of the present invention using a three-electrode system is as follows:

[0148] 1. Place an electrolyte insulating sealing ring 8 into a mold 1 provided with a cavity, and then place the platinum sheet counter electrode 2 in close contact with the electrolyte insulating sealing ring 8;

[0149] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the platinum counter electrode 2 and the air sealing ring 9;

[0150] 3. Use the fastening bolts 10 to fix the counter electrode conductor ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the platinum counter electrode 2;

[0151] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0152] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into it so that it is in close contact with the lithium sheet reference electrode 4 and the air sealing ring 9;

[0153] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the lithium sheet reference electrode 4;

[0154] 7. Add 0.8 mL of conventional electrolyte into the electrolyte cavity 12 through the injection hole 11;

[0155] 8. Put the electrolyte insulating sealing ring 8 on the platinum working electrode 6 coated with the negative electrode material of the lithium-ion battery, and then screw the sealing cover 7 tightly connected to the working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the working electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line as the center of the counter electrode 2 and the reference electrode 4;

[0156] 9. Connect the instrument and the equipment to the counter electrode conductive electrode ear 3, the reference electrode conductive electrode ear 5, and the working electrode 6 respectively, and then perform a cyclic voltammetry test at room temperature within a voltage range of 3 to 0.005 V at a scanning speed of 0.05 mV / s;

[0157] 10. Test results: Figure 8 Cyclic voltammetry curve of negative electrode material for lithium-ion battery;

[0158] 11. Result analysis: Figure 8 It can be seen from the cyclic voltammetry curve that when the negative electrode material is scanned in the negative direction, an obvious reduction peak appears before 0.38 V (corresponding to the formation of the solid electrolyte membrane on the negative electrode), and obvious reduction peaks appear at 0.11 V and 0.005 V. When scanned in the positive direction, obvious oxidation peaks appear at 0.20 V and 0.26 V, indicating the typical lithium insertion (reduction) and lithium removal (oxidation) process of this negative electrode material.

[0159] Embodiment 7:

[0160] The cyclic voltammetry curve of the positive electrode material of a lithium-ion battery tested by the device of the present invention using a two-electrode system:

[0161] 1. Place an electrolyte insulating sealing ring 8 in a mold 1 provided with a cavity, and then replace the platinum sheet with an aluminum foil coated with a lithium-ion battery positive electrode material to closely contact the electrode 2 (i.e., the positive electrode sheet 2) with the electrolyte insulating sealing ring 8;

[0162] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the positive electrode sheet 2 and the air sealing ring 9;

[0163] 3. Use the fastening bolts 10 to fix the counter electrode conductive ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the positive electrode sheet 2;

[0164] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet counter electrode / reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0165] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into it so that it is in close contact with the lithium sheet counter electrode / reference electrode 4 and the air sealing ring 9;

[0166] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 provided with the cavity, and simultaneously press the air sealing ring 9 and the lithium sheet counter electrode / reference electrode 4;

[0167] 7. Add 0.8 mL of conventional electrolyte into the electrolyte cavity 12 through the injection hole 11;

[0168] 8. Put the electrolyte insulating sealing ring 8 on the working electrode 6, and then screw the sealing cover 7 tightly connected to the working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the working electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line with the center of the positive electrode sheet 2 and the lithium sheet counter electrode / reference electrode 4;

[0169] 9. Connect the instrument and equipment to the counter electrode conductive ear 3 and the reference electrode conductive ear 5 respectively (Note: the counter electrode conductive ear 3 of the electrochemical test device is connected to the working electrode of the test device, the reference electrode conductive ear 5 of the electrochemical test device is connected to the counter electrode and the reference electrode of the test device, and the working electrode 6 of the electrochemical test device is not connected to the test device), and then perform cyclic voltammetry test at room temperature, within the voltage range of 2~4.2 V, at a scanning speed of 0.05 mV / s;

[0170] 10. Test results: Fig. 9 Cyclic voltammetry curve of positive electrode material for lithium-ion battery;

[0171] 11. Result analysis: Fig. 9 It can be seen from the cyclic voltammetry curve that the positive electrode material has an obvious oxidation peak at 4.04 V during the positive scan, and an obvious reduction peak at 3.03 V during the negative scan, indicating the typical lithium de-lithiation (oxidation) and lithium insertion (reduction) process of the positive electrode material.

[0172] Embodiment 8:

[0173] The cyclic voltammetry curve of the negative electrode material of a lithium-ion battery tested by the device of the present invention using a two-electrode system:

[0174] 1. Placing an electrolyte insulating sealing ring 8 into a mold 1 provided with a cavity, and then replacing the platinum sheet with a copper foil coated with a negative electrode material of a lithium-ion battery to closely contact the electrode 2 (i.e., the negative electrode sheet 2) with the electrolyte insulating sealing ring 8;

[0175] 2. Place the air sealing ring 9 into the sealing groove, and place the counter electrode conductive ear 3 into close contact with the negative electrode sheet 2 and the air sealing ring 9;

[0176] 3. Use the fastening bolts 10 to fix the counter electrode conductive ear 3 on the mold 1 with the cavity, and at the same time press the air sealing ring 9 and the negative electrode sheet 2;

[0177] 4. Place the electrolyte insulating sealing ring 8 on the other side of the mold 1 provided with the cavity, and then make the lithium sheet counter electrode / reference electrode 4 in close contact with the electrolyte insulating sealing ring 8;

[0178] 5. Place the air sealing ring 9 into the sealing groove, and put the reference electrode conductive ear 5 into it so that it is in close contact with the lithium sheet counter electrode / reference electrode 4 and the air sealing ring 9;

[0179] 6. Use the fastening bolts 10 to fix the reference electrode conductive ear 5 on the mold 1 provided with the cavity, and simultaneously press the air sealing ring 9 and the lithium sheet counter electrode / reference electrode 4;

[0180] 7. Add 0.8 mL of conventional electrolyte into the electrolyte cavity 12 through the injection hole 11;

[0181] 8. Put the electrolyte insulating sealing ring 8 on the working electrode 6, and then screw the sealing cover 7 tightly connected to the working electrode 6 into the threaded injection hole 11 to make it sealed and adjust the electrode surface of the working electrode 6 to be located at the center of the electrolyte cavity 12 and on the same horizontal line with the center of the negative electrode sheet 2 and the lithium sheet counter electrode / reference electrode 4;

[0182] 9. Connect the instrument and equipment to the counter electrode conductive ear 3 and the reference electrode conductive ear 5 respectively (Note: the counter electrode conductive ear 3 of the electrochemical test device is connected to the working electrode of the test device, the reference electrode conductive ear 5 of the electrochemical test device is connected to the counter electrode and the reference electrode of the test device, and the working electrode 6 of the electrochemical test device is not connected to the test device), and then perform cyclic voltammetry test at room temperature in the voltage range of 3~0.005 V at a scanning speed of 0.05 mV / s;

[0183] 10. Test results: Fig.10 Cyclic voltammetry curve of negative electrode material for lithium-ion battery;

[0184] 11. Result analysis: Fig.10 It can be seen from the cyclic voltammetry curve that when the negative electrode material is scanned in the negative direction, an obvious reduction peak appears before 0.76 V (corresponding to the formation of the solid electrolyte membrane on the negative electrode), and an obvious reduction peak appears at 0.005 V. When scanned in the positive direction, an obvious oxidation peak appears at 0.60 V, indicating the typical lithium insertion (reduction) and lithium removal (oxidation) process of the negative electrode material.

[0185] The present invention aims at the defects and shortcomings of the current electrochemical testing devices, and provides an electrochemical testing device with simple structure, good airtightness, strong operability, stable performance and multifunctionality. According to the requirements of different test purposes, the device can be used for testing of three-electrode system or two-electrode system; the positions of the counter electrode, reference electrode and working electrode can be arbitrarily converted; and it can be used for the research of electrolyte or electrode materials.

[0186] The present invention is implemented as follows: it includes a mold with a cavity, a counter electrode, a reference electrode, an electrolyte insulating seal ring, an air seal ring, and a counter electrode conductive ear and a reference electrode conductive ear, the cavity of the mold is on the same horizontal line as the geometric centers of the counter electrode and the reference electrode, the bolts fix the two side ears on the mold, and at the same time press the air seal ring and the electrolyte insulating seal ring, the electrode surface of the working electrode is at the geometric center of the cavity, the injection hole is located directly above the mold cavity and is slightly larger than the working electrode, the sealing cover is tightly connected to the working electrode, and the inner diameter of the electrolyte insulating seal ring in the injection hole is consistent with that of the working electrode.

[0187] Compared with the prior art, the device of the present invention has the following beneficial effects:

[0188] 1. The electrode, reference electrode, working electrode, electrolyte insulation seal ring and air seal ring are compressed and fixed through a flexibly disassembled mold with a cavity. Each part can be freely disassembled and adjusted independently of each other. While ensuring the sealing and reliability of the entire system, it also has the characteristics of simple structure, high operability, easy disassembly and cleaning, and reusability.

[0189] 2. The centers of the counter electrode and the reference electrode of the present invention are on the same horizontal line, and the electrode surface of the working electrode is located at the exact center of this horizontal line, which can fully ensure that the spatial positions of the three are at fixed positions during each test, and can fully ensure the consistency and reliability of the test.

[0190] 3. The mold of the present invention is made of a material that is electrically insulating, electrochemically inert and has excellent mechanical strength, does not react with the electrolyte, and has stable performance, thereby ensuring the accuracy of the test results.

[0191] 4. The electrolyte of the present invention only contacts the reaction surfaces of the working electrode, the reference electrode and the counter electrode, but not the current collector connected to the external circuit, thereby ensuring the accuracy of the test results.

[0192] 5. The counter electrode conductive lug and the reference electrode conductive lug in the present invention do not contact the electrolyte, thereby ensuring that the conductive lugs will not react during the test, ensuring the accuracy of the test results, and effectively extending the service life of the entire system.

[0193] 6. The present invention has double sealing properties, which can ensure that the side of the counter electrode and the reference electrode that is not in contact with the electrolyte is also not in contact with the air, so that some materials that are more active in the air can be selected as electrode materials, such as lithium, sodium, potassium, etc., and it can also more effectively prevent air from entering the electrolyte, thereby ensuring the accuracy of the test results.

[0194] 7. The present invention adds electrolyte through the liquid injection port, and the amount of electrolyte added can be adjusted by adjusting the size of the cavity, thereby ensuring that the required performance can be accurately measured under the condition of a very small amount of electrolyte.

[0195] 8. The present invention can be used for both three-electrode system testing and two-electrode system testing, and has a wide range of application functions.

[0196] 9. The counter electrode, reference electrode and working electrode of the present invention can be flexibly changed to meet the needs of different test purposes.

[0197] 10. The present invention can be used for testing electrolytes as well as electrode materials, and is an all-round electrochemical research system.

[0198] In summary, the electrochemical testing device of the present invention has the characteristics of simple structure, good air tightness, strong operability, stable performance and multi-function.

Claims

1. A double-sealed multifunctional electrochemical testing device, characterized in that: The device specifically comprises an insulating corrosion-resistant mould (1) provided with a cavity (12); one side of the cavity (12) of the insulating corrosion-resistant mould (1) is provided with a first electrolyte insulating sealing ring (801), a first electrode (2), a first air sealing ring (901), and a first conductive electrode ear (3) which are detachably connected in sequence, and the other side of the cavity (12) of the insulating corrosion-resistant mould (1) is provided with a second electrolyte insulating sealing ring (802), a second electrode (4), a second air sealing ring (902), and a second conductive electrode ear (5) which are detachably connected in sequence; the detachable connection is a fixed and compressed connection by means of bolts (10); an injection hole (11) is provided on the upper side of the cavity (12) of the insulating corrosion-resistant mould (1), and a third electrolyte insulating sealing ring (803) and a sealing cover with a thread are provided in sequence on the injection hole (11). (7), a third electrode (6) is fixedly provided in the sealing cover (7) and passes through the sealing cover (7), and the third electrode (6) and the sealing cover (7) are arranged in a coaxial axis; the lower end surface of the third electrode (6) and the center point of the cavity (12), the center point of the first electrode (2), and the center point of the second electrode (4) are on the same horizontal line; the preparation materials of the insulating corrosion-resistant mold (1) provided with the cavity (12) and the sealing cover (7) have electrical insulation, mechanical properties, and no electrochemical activity; the preparation materials of the first conductive electrode lug (3) and the second conductive electrode lug (5) are specifically high-strength and high-conductivity metal; the first electrode (2) is specifically a counter electrode, or a working electrode, or a reference electrode; the second electrode (4) is specifically a reference electrode, or a counter electrode, or a working electrode; the third electrode (6) is specifically a working electrode, or a reference electrode, or a counter electrode.

2. The double-sealed multifunctional electrochemical testing device according to claim 1, characterized in that: The materials used to prepare the first electrode (2) and the third electrode (6) have electrochemical inertness and high electrical conductivity.

3. An assembly method of the double-sealed multifunctional electrochemical testing device according to claim 1 or 2, characterized in that: The assembly method specifically comprises the following steps: Step 1: placing the first electrolyte insulating sealing ring (801), the first electrode (2), the first air sealing ring (901) and the first conductive electrode ear (3) in sequence on an insulating corrosion-resistant mold (1) provided with a cavity (12), and fixing and pressing them with bolts (10); Step 2: placing the second electrolyte insulating seal ring (802), the second electrode (4), the second air seal ring (902) and the second conductive electrode ear (5) in sequence on an insulating corrosion-resistant mold (1) provided with a cavity (12), and fixing and pressing them with bolts (10); Step 3: injecting electrolyte into the cavity (12) through the injection hole (11) so that the electrolyte submerges the first electrode (2) and the second electrode (4); Step 4: placing the third electrolyte insulating sealing ring (803) in the injection hole (11), and tightening the sealing cover (7) tightly connected to the third electrode (6), so that the entire system is sealed, and the lower end surface of the third electrode (6) is located in the center of the cavity (12) and on the same horizontal line as the centers of the first electrode (2) and the second electrode (4); Step 5: Connect the instrument or device to the first conductive electrode lug (3), the second conductive electrode lug (5) and the third electrode (6) respectively, and perform real-time testing at a desired temperature.

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