Electrochemical performance in-situ multifunctional testing device

Abstract

The utility model relates to the technical field of electrochemical detection, in particular to an electrochemical performance in-situ multifunctional testing device which comprises an upper shell and a lower shell, the upper shell covers the lower shell to form a cavity, the lower shell is sequentially provided with a first installation bin, an installation groove and a second installation bin from top to bottom in the vertical direction, and the first installation bin, the installation groove and the second installation bin are communicated with each other. The upper shell is provided with an air hole, the lower shell is provided with a first terminal, and the upper shell is provided with a second terminal. The electrochemical performance in-situ multifunctional testing device disclosed by the utility model can avoid the problems that the DOE experiment in the electrochemical design stage is too long and time and labor are wasted.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemistry detection technical field more particularly, relate to a kind of electrochemical performance in situ multifunctional testing device. BACKGROUND

[0002] In recent years, with the great breakthrough on the technology level of electrochemical energy storage device, it has obtained rapid development in many fields, especially in the new energy vehicle field represented by lithium ion secondary battery, in the energy storage field represented by sodium ion secondary battery and in the power grid primary frequency modulation secondary frequency modulation, wind power variable pitch and other power output required power consumption fields represented by supercapacitor and hybrid capacitor.However, at present, no matter which kind of electrochemical energy storage device, in electrochemical design stage, when judging the performance of its material or component, it cannot be in situ characterized for the whole system, but only one or two materials can be characterized for performance, and then data integration is carried out. This requires a large number of single performance index optimization test design (DOE), which is time-consuming and laborious.

[0003] Therefore, there is an urgent need for an electrochemical performance in situ multifunctional testing device to shorten the DOE experiment time, reduce the energy storage device development process in the research and development process, improve the electrochemical performance characterization efficiency and improve the electrochemical formula design speed of energy storage device. UTILITY MODEL CONTENT

[0004] The utility model discloses to overcome the above-mentioned prior art in electrochemical design stage DOE experiment too long, there is time-consuming and laborious problem, provide a kind of electrochemical performance in situ multifunctional testing device, to shorten the DOE experiment time.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is: an electrochemical performance in situ multifunctional testing device, comprising an upper shell and a lower shell, the upper shell cover is arranged on the lower shell to form a cavity, the lower shell is sequentially provided with a first mounting bin, a mounting groove and a second mounting bin from top to bottom along the vertical direction, the upper shell is provided with a gas hole, the lower shell is provided with a first terminal, and the upper shell is provided with a second terminal.

[0006] In the technical scheme of the present application, before testing by using the electrochemical performance in situ multifunctional testing device, the positive electrode sheet, the negative electrode sheet and the separator are cut according to the size requirement, and are sequentially placed into the second mounting bin, the mounting groove and the first mounting bin, and the electrolyte is added, the upper shell is covered and the cavity is sealed, and the electrolyte is fully infiltrated into the separator and the positive and negative electrode sheets after soaking for a period of time; after soaking, the first terminal and the second terminal are respectively connected with the positive and negative terminals of the electrochemical workstation, to form a battery test system.

[0007] Three-electrode test system assembly method: the copper wire as the reference electrode is inserted into the air hole after acid treatment, and is placed between the positive electrode sheet / negative electrode sheet and the separator, the contact surface of the copper wire and the positive electrode sheet / negative electrode sheet is separately covered with a separator, and then the air hole is closed; the copper wire as the reference electrode can be brushed with conductive silver paste after acid treatment, or the positive terminal (first terminal or second terminal) of the device can be connected to the positive electrode of the workstation before testing, and the copper wire exposed outside the device is plated with lithium under a small current. After the lithium plating work is completed, the positive electrode of the electrochemical workstation is connected to the positive terminal (first terminal or second terminal) of the test device, the negative electrode of the electrochemical workstation is connected to the negative terminal of the test device, and the reference connection line of the electrochemical workstation is connected to the reference copper wire, to assemble a three-electrode test system.

[0008] The device can simultaneously characterize the electrochemical changes of the positive and negative electrode materials, the charge-discharge curves of the positive and negative electrodes, the potential changes and the AC impedance changes of the battery during different processes and different requirements.

[0009] The above tests can be performed singly or in combination, and the temperature can be used to study the electrochemical performance of each material at different temperatures, forming a complete multifunctional monitoring system.

[0010] The assembly method of the closed pore / broken membrane temperature test device is as follows: stainless steel sheets are placed in the first installation bin / second installation bin, the separator is placed in the stainless steel sheet, electrolyte is injected, and then the oven is used for temperature rising internal resistance test. The data recorder containing a bridge is connected with the first terminal and the second terminal of the device, and one end of the thermocouple for collecting temperature is connected with the data recorder, and the other end is introduced into the cavity through the air hole to monitor the temperature data. With the increase of temperature, the closed pore and broken membrane temperature of the separator are determined by the change of ion conductivity.

[0011] The assembly method of the heat shrinkage device is as follows: a fixed size separator is cut, points are taken and marked in the MD direction and the TD direction of the separator, then the separator is placed in the first installation bin or the second installation bin and placed flat. The thermocouple is introduced into the device through the air hole (the other end of the thermocouple is connected with the data recorder to achieve the purpose of accurate monitoring of the temperature of the separator), and the upper shell is covered. The distance L of the marked points in the MD (TD) direction is measured by the optical lens, then the device is baked at different temperatures and different times, and after baking, the distance L' of the marked points in the MD (TD) direction is measured by the optical lens, and finally the heat shrinkage rate of the separator is obtained by the formula: heat shrinkage rate = L' / L.

[0012] The electrochemical performance in-situ multifunctional test device can meet the demand of multifunctional test, and can avoid the problems of long DOE experiment and time-consuming and laborious in the electrochemical design stage.

[0013] Further, the air hole comprises an air inlet hole and an air outlet hole.

[0014] Further, an air outlet pipe is installed in the air outlet hole, one end of the air outlet pipe extends into the cavity and extends towards the first installation compartment, the air outlet pipe is a conductive structure and forms the second terminal.

[0015] Further, the other end of the air outlet hole is exposed outside the cavity, and a first cover is installed at the end of the air outlet hole exposed outside the cavity.

[0016] Further, an air inlet pipe is installed in the air inlet hole, one end of the air inlet pipe extends into the cavity, and the other end of the air inlet pipe is exposed outside the cavity, and a second cover is installed at the end of the air inlet pipe exposed outside the cavity.

[0017] Further, a limiting block is arranged in the first installation compartment and on the inner wall surface of the lower shell or / and in the second installation compartment and on the inner wall surface of the lower shell, and the limiting block is an anti-corrosion insulating structure.

[0018] Further, a first threaded structure is arranged at the opening of the open structure, a second threaded structure is arranged at the position connected with the open structure of the upper shell, the first threaded structure is threadedly connected with the second threaded structure, and at least one of the first threaded structure and the second threaded structure is an anti-corrosion insulating structure.

[0019] Further, the upper shell and the lower shell are both stainless steel structures.

[0020] Further, a connecting portion is arranged on the outer side of the lower shell, a first connecting hole is arranged on the connecting portion, a second connecting hole is arranged on the upper shell and corresponds to the position of the first connecting hole, a fastener is connected in the first connecting hole and the second connecting hole, and the fastener is located outside the cavity.

[0021] Further, a transparent observation window is arranged on the upper shell.

[0022] Compared with the prior art, the electric chemical performance in-situ multifunctional testing device has the beneficial effects that: the first terminal, the second terminal and the electrochemical workstation as an input / output power source are connected to form a battery charging and discharging system.

[0023] The electric chemical performance in-situ multifunctional testing device can study the electrochemical performance of the positive / negative half-battery and the full battery. In addition, the copper wire introduced from the air inlet hole to the electrode working surface can be used for three-electrode system research.

[0024] Furthermore, Raman can be used to observe the laser through the transparent observation window, and the positive plate, negative plate, separator and electrolyte can be in-situ characterized under the test conditions of constant current charge / discharge, pulse charge / discharge, constant voltage charge / discharge, cycle, rate, etc.; by introducing inert gas from the air inlet hole, and the air outlet hole is connected with a gas chromatograph mass spectrometer, the gas composition, gas production rate and other information of the battery under different charge states and different charge rates can be monitored.

[0025] Due to the good heat conduction performance of the whole device, it can be put into an oven to detect the physical and chemical properties and gas production of the materials of the battery under different environmental temperature conditions and different charge states; the thermocouple can also be introduced into the cavity through the air inlet hole to accurately monitor the temperature change of the battery.

[0026] The electrochemical performance in-situ multifunctional testing device is connected with the bridge through the first terminal and the second terminal, and the ion conductivity is detected by the method of heating in the oven to determine the closing temperature and the membrane breaking temperature of the separator.

[0027] The electrochemical performance in-situ multifunctional testing device can perform thermal shrinkage experiment on the separator under the conditions of air, inert gas and electrolyte, and judge the thermal shrinkage of the separator through the observation window. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the structural principle diagram of the electrochemical performance in-situ multifunctional testing device of the utility model;

[0029] Figure 2 is the structural schematic diagram of the electrochemical performance in-situ multifunctional testing device of the utility model from the perspective of top view;

[0030] Figure 3 is the structural schematic diagram of the upper shell of the electrochemical performance in-situ multifunctional testing device of the utility model;

[0031] Figure 4 is the structural schematic diagram of the lower shell of the electrochemical performance in-situ multifunctional testing device of the utility model.

[0032] In the drawings: 1, the upper shell; 2, the lower shell; 3, the cavity; 4, the positive plate; 5, the negative plate; 6, the first installation warehouse; 7, the second installation warehouse; 8, the separator; 9, the installation groove; 10, the air inlet hole; 11, the air outlet hole; 12, the observation window; 13, the first terminal; 14, the first cover; 15, the air inlet pipeline; 16, the second cover; 17, the first limiting block; 18, the second limiting block; 19, the first threaded structure; 20, the second threaded structure; 21, the connecting part; 22, the first connecting hole; 23, the second connecting hole; 24, the fastener; 25, the insulating pad; 26, the third limiting block; 27, the fourth limiting block; 28, the interlayer space; 29, the installation block; 30, the air outlet pipeline. Detailed Implementation

[0033] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0034] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0036] Example 1

[0037] like Figures 1 to 4 As shown, an in-situ multifunctional electrochemical performance testing device includes an upper shell 1 and a lower shell 2. The upper shell 1 covers the lower shell 2 to form a cavity 3. The lower shell 2 is provided with a first mounting chamber 6, a mounting groove 9 and a second mounting chamber 7 in a vertical direction from top to bottom. The upper shell 1 is provided with vent holes, the lower shell 2 is provided with a first terminal 13 and the upper shell 1 is provided with a second terminal.

[0038] In this embodiment, before testing using the in-situ multifunctional electrochemical performance testing device, the positive electrode 4, negative electrode 5, and separator 8 are cut to size according to requirements and placed sequentially into the second mounting chamber 7, mounting groove 9, and first mounting chamber 6. Alternatively, the negative electrode 5, separator 8, and positive electrode 4 can be placed sequentially into the second mounting chamber 7, mounting groove 9, and first mounting chamber 6. Electrolyte is then added, the upper shell 1 is covered, and the cavity 3 is sealed. The mixture is left to soak for a period of time to allow the electrolyte to fully soak the separator 8 and the positive and negative electrode plates. After soaking, the first terminal 13 and the second terminal are connected to the positive and negative terminals of the electrochemical workstation, respectively, to form a battery testing system.

[0039] Three-electrode test system assembly method: the copper wire as the reference electrode is inserted into the air hole after acid treatment, and is placed between the positive electrode tab 4 / negative electrode tab 5 and the separator 8. The contact surface of the copper wire and the positive electrode tab 4 / negative electrode tab 5 is individually covered with a separator 8, and then the air hole is closed. The copper wire as the reference electrode can be brushed with conductive silver paste after acid treatment, or the positive terminal (first terminal 13 or second terminal) of the device can be connected to the positive electrode of the workstation before testing. The copper wire exposed outside the device is connected to the negative electrode of the workstation under a small current to perform lithium plating. After the lithium plating work is completed, the positive electrode of the electrochemical workstation is connected to the positive terminal (first terminal 13 or second terminal) of the test device, the negative electrode of the electrochemical workstation is connected to the negative terminal of the test device, and the reference connection line of the electrochemical workstation is connected to the reference copper wire, thereby assembling a three-electrode test system.

[0040] The device can be used to synchronize the characterization of the electrochemical changes of the positive and negative electrode materials, the charge-discharge curves of the positive and negative electrodes, the potential changes, and the AC impedance changes during the charge-discharge process of the battery at different steps and different requirements.

[0041] The above tests can be performed individually or in combination, and the temperature can be used to study the electrochemical performance of each material at different temperatures, forming a complete multifunctional monitoring system.

[0042] Closed pore / broken membrane temperature test device assembly method: place the stainless steel sheet in the first installation bin 6 / second installation bin 7, place the separator 8 in the stainless steel tab, inject electrolyte, and then place it in an oven for temperature resistance test. Connect the data logger containing the bridge to the first terminal 13 and the second terminal of the device, and connect one end of the thermocouple for collecting temperature data to the data logger, and the other end extends into the cavity 3 through the air hole to monitor temperature data. As the temperature rises, the closed pore and broken membrane temperature of the separator 8 are determined by the change in ionic conductivity.

[0043] Thermal shrinkage device assembly method: cut the fixed size separator 8, take points and mark in the MD and TD directions of the separator 8, then place the separator 8 in the first installation bin 6 or the second installation bin 7, and place it flat. Introduce the thermocouple into the device through the air hole (the other end of the thermocouple is connected to the data logger to achieve accurate monitoring of the temperature of the separator 8), and cover the upper shell 1. Measure the distance L of the marked points in the MD(TD) direction through the optical lens, then bake the device at different temperatures and different times, and measure the distance L' of the marked points in the MD(TD) direction through the optical lens after baking. Finally, the thermal shrinkage rate of the separator 8 is obtained by the formula = L' / L.

[0044] The gas hole includes the gas inlet hole 10 and the gas outlet hole 11. The battery gas production during operation is detected: the inert gas can be filled into the gas inlet hole 10, so that the inert gas carries out the reaction gas from the inside of the cavity 3 (the inside of the battery), and is discharged along the gas outlet hole 11. By connecting the gas chromatograph to the gas outlet hole 11, the battery gas composition and gas production rate under different conditions can be monitored.

[0045] As shown in Figure 1 , Figure 3 , the gas outlet pipe 30 is installed in the gas outlet hole 11. One end of the gas outlet pipe 30 extends into the cavity 3 and extends towards the first mounting compartment 6. The gas outlet pipe 30 is a conductive structure and forms a second terminal. The end of the gas outlet pipe 30 extends towards the first mounting compartment 6, which only indicates the extension direction of the gas outlet hole 11, and does not mean that the gas outlet hole 11 will contact the pole piece installed in the first mounting compartment 6. In this embodiment, the gas outlet pipe 30 can be connected to the gas chromatograph to monitor the gas composition and gas production rate inside the cavity 3 (i.e. inside the battery) under different conditions. On the other hand, since the gas outlet pipe 30 extends towards the first mounting compartment 6 and is in contact with the electrolyte added to the cavity 3, the gas outlet pipe 30 is in a conductive structure, and the gas outlet pipe 30 can be used as a second terminal for connecting to the electrode of the electrochemical workstation. It should be noted that the gas outlet pipe 30 can be a conductive metal structure. Considering that the end of the gas outlet pipe 30 extending into the cavity 3 needs to be in contact with the electrolyte, the gas outlet pipe 30 can be made of stainless steel. It should be noted that the end of the gas outlet pipe 30 extending into the cavity 3 is fixed by the third limiting block 26 installed on the inner wall of the upper shell 1. The gas outlet pipe 30 penetrates the third limiting block 26, and the third limiting block 26 is a polytetrafluoroethylene structure.

[0046] As shown in Figures 1 to 3 , the other end of the gas outlet pipe 30 is exposed outside the cavity 3, and the end of the gas outlet pipe 30 exposed outside the cavity 3 is provided with the first cover 14. It should be noted that the electrochemical performance in-situ multifunctional testing device needs to maintain the airtightness of the inside of the cavity 3 in some test scenarios. By installing the first cover 14 on the end of the gas outlet pipe 30, the sealing of the environment inside the cavity 3 can be achieved.

[0047] As shown in Figures 1 to 3As shown, the air inlet hole 10 is provided with an air inlet pipe 15, one end of the air inlet pipe 15 extends into the cavity 3, and the other end of the air inlet pipe 15 is exposed outside the cavity 3, and the end of the air inlet pipe 15 exposed outside the cavity 3 is provided with a second cover 16. It should be noted that when the three-electrode test system is assembled: the copper wire as the reference electrode is inserted into the air inlet pipe 15 after acid treatment, and is placed between the positive electrode plate 4 / negative electrode plate 5 and the diaphragm 8, the contact surface of the copper wire and the positive electrode plate 4 / negative electrode plate 5 is separately covered with the diaphragm 8, and then the air inlet pipe 15 is closed through the second cover 16. In some other test scenarios of the in-situ multifunctional test device of the electrochemical performance, the air tightness inside the cavity 3 needs to be maintained, and the second cover 16 installed at the end of the air inlet pipe 15 can realize the sealing of the internal environment of the cavity 3. It should be noted that since one end of the air inlet pipe 15 is located in the cavity 3, and in order to insulate the air inlet pipe 15, the air inlet pipe 15 can adopt a polytetrafluoroethylene structure. Further, the end of the air inlet pipe 15 extending into the cavity 3 is fixed by a fourth limiting block 27 installed on the inner wall surface of the upper shell 1, the air inlet pipe 15 penetrates the fourth limiting block 27, and the fourth limiting block 27 is a polytetrafluoroethylene structure.

[0048] As shown in Figure 1 , Figure 4 , the limiting block in the first mounting compartment 6 and located on the inner wall surface of the lower shell 2 or / and the limiting block in the second mounting compartment 7 and located on the inner wall surface of the lower shell 2 is provided. The limiting block is an anti-corrosion insulating structure. Specifically, the limiting block in the first mounting compartment 6 and located on the inner wall surface of the lower shell 2 is a first limiting block 17. It should be noted that the number of first limiting blocks 17 can be set as needed, and the first limiting block 17 can limit the position of the positive electrode plate 4 / negative electrode plate 5 in the first mounting compartment 6, so as to avoid the position of the positive electrode plate 4 / negative electrode plate 5 from being deviated after the positive electrode plate 4 / negative electrode plate 5 is installed in the first mounting compartment 6. It should also be pointed out that the first limiting block 17 can adopt a polytetrafluoroethylene structure.

[0049] As shown in Figure 1 , Figure 4 , the limiting block in the second mounting compartment 7 and located on the inner wall surface of the lower shell 2 is a second limiting block 18. It should be noted that the number of second limiting blocks 18 can be set as needed, and the second limiting block 18 can limit the position of the positive electrode plate 4 / negative electrode plate 5 in the second mounting compartment 7, so as to avoid the position of the positive electrode plate 4 / negative electrode plate 5 from being deviated after the positive electrode plate 4 / negative electrode plate 5 is installed in the second mounting compartment 7. It should also be pointed out that the second limiting block 18 can adopt a polytetrafluoroethylene structure.

[0050] As shown in Figure 3 , Figure 4As shown in the figure, the lower shell 2 is provided with a first threaded structure 19 at the connection with the upper shell 1, and the upper shell 1 is provided with a second threaded structure 20 at the connection with the lower shell 2, and the first threaded structure 19 is threadedly connected with the second threaded structure 20. In this embodiment, the upper shell 1 and the lower shell 2 can be quickly disassembled and assembled through the threaded connection between the first threaded structure 19 and the second threaded structure 20; at the same time, the threaded connection between the first threaded structure 19 and the second threaded structure 20 can also achieve the airtightness inside the cavity 3. At least one of the first threaded structure 19 and the second threaded structure 20 is an anticorrosive insulating structure, so that the upper shell 1 and the lower shell 2 are relatively insulated. It should be noted that at least one of the first threaded structure 19 and the second threaded structure 20 is a polytetrafluoroethylene structure. The lower shell 2 is an open structure with an opening facing upward, and the upper shell 1 is an open structure with an opening facing downward, the first threaded structure 19 is arranged on the open structure of the lower shell 2, and the second threaded structure 20 is arranged on the open structure of the upper shell 1.

[0051] As shown in the figure, Figure 3 , Figure 4 The upper shell 1 and the lower shell 2 are both stainless steel structures. It should be noted that the upper shell 1 and the lower shell 2 are both stainless steel structures, which can prevent the upper shell 1 and the lower shell 2 from being corroded. The upper shell 1 and the lower shell 2 are in an insulating connection state through the insulating connection between the first threaded structure 19 and the second threaded structure 20.

[0052] Embodiment 2

[0053] This embodiment 2 is similar to embodiment 1, and the difference is that, as shown in the figure, Figure 1 , Figure 4 The lower shell 2 is provided with a connecting portion 21 on the outer side, the connecting portion 21 is provided with a first connecting hole 22, the upper shell 1 is provided with a second connecting hole 23 corresponding to the position of the first connecting hole 22, and a fastener 24 is connected in the first connecting hole 22 and the second connecting hole 23, and the fastener 24 is located outside the cavity 3. It should be noted that the connecting portion 21 is arranged on the outer side of the lower shell 2, which can prevent the chemical liquid inside the cavity 3 from being corroded. The upper shell 1 and the lower shell 2 can be connected through the fastener 24, which can ensure the airtightness between the upper shell 1 and the lower shell 2. It should be noted that the fastener 24 can be a fastening bolt, and the fastening bolt can adopt a polytetrafluoroethylene structure. It should be further pointed out that the upper shell 1 has a sandwich space 28, and the inner wall surface of the sandwich space 28 of the upper shell 1 is provided with a mounting block 29, the mounting block 29 is a polytetrafluoroethylene structure, and the second connecting hole 23 penetrates the mounting block 29. When the fastener 24 is connected in the first connecting hole 22 and the second connecting hole 23, the fastener 24 is located outside the cavity 3, which can further prevent the fastener 24 from being corroded.

[0054] As shown in the figure, Figure 1 ,Figure 4 As shown, an insulating pad 25 is provided at the bottom of the lower housing 2. It should be noted that the insulating pad 25 at the bottom of the lower housing 2 serves as an insulating layer.

[0055] Example 3

[0056] This embodiment 3 is similar to embodiment 1, except that, as Figure 1 , Figure 2 As shown, the upper housing 1 is provided with a transparent observation window 12. Raman in-situ testing assembly method: The assembly method is the same as that of the three-electrode testing system, and a reference copper wire can also be added for in-situ characterization of the positive and negative electrodes. The difference is that holes need to be drilled on the positive electrode 4 and the negative electrode 5. When testing the positive electrode, a hole is drilled on the positive electrode and the positive electrode is placed near the observation window 12. The Raman laser can irradiate different positions of the positive electrode (near the diaphragm 8, in the middle, and near the current collector). When testing the negative electrode, a hole is drilled on the negative electrode and the negative electrode is placed near the observation window. The Raman laser can irradiate different positions of the negative electrode (near the diaphragm 8, in the middle, and near the current collector). When testing the electrolyte, holes are drilled on the positive electrode, the negative electrode, and the diaphragm 8 so that the Raman laser can penetrate the area containing only the electrolyte through the observation window 12. When testing the diaphragm 8, holes are drilled on the positive electrode 4 and the negative electrode 5 near the observation window 12 so that the Raman laser irradiates the area of ​​the diaphragm 8.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An in-situ multifunctional testing device for electrochemical performance, characterized in that, The application relates to a shell structure, which comprises an upper shell (1) and a lower shell (2), the upper shell (1) being arranged on the lower shell (2) to form a cavity (3); the lower shell (2) is sequentially provided with a first mounting bin (6), a mounting groove (9) and a second mounting bin (7) from top to bottom along the vertical direction; the upper shell (1) is provided with air holes; the lower shell (2) is provided with first terminals (13); and the upper shell (1) is provided with second terminals. 2.The in-situ multifunctional testing device for electrochemical performance according to claim 1, wherein, The air holes comprise air inlet holes (10) and air outlet holes (11). 3.The in-situ multifunctional testing device for electrochemical performance according to claim 2, characterized in that, An air outlet pipeline (30) is arranged in the air outlet holes (11), one end of the air outlet pipeline (30) extends into the cavity (3) and extends towards the first mounting bin (6), the air outlet pipeline (30) is of a conductive structure and forms the second terminals. 4.The in-situ multifunctional testing device for electrochemical performance according to claim 3, wherein, The other end of the air outlet pipeline (30) is exposed outside the cavity (3), and a first cover (14) is arranged at the end of the air outlet pipeline (30) exposed outside the cavity (3). 5.The in-situ multifunctional testing device for electrochemical performance according to claim 2, wherein, An air inlet pipeline (15) is arranged in the air inlet holes (10), one end of the air inlet pipeline (15) extends into the cavity (3), and the other end of the air inlet pipeline (15) is exposed outside the cavity (3), and a second cover (16) is arranged at the end of the air inlet pipeline (15) exposed outside the cavity (3). 6.The in-situ multifunctional testing device for electrochemical performance according to claim 1, wherein, Limiting blocks are arranged in the first mounting bin (6) and on the inner wall surface of the lower shell (2) or / and in the second mounting bin (7) and on the inner wall surface of the lower shell (2), the limiting blocks are of an anticorrosion and insulating structure. 7.The in-situ multifunctional testing device for electrochemical performance according to claim 1, wherein, The lower shell (2) is provided with a first threaded structure (19) at the position connected with the upper shell (1), the upper shell (1) is provided with a second threaded structure (20) at the position connected with the lower shell (2), the first threaded structure (19) is threadedly connected with the second threaded structure (20), and at least one of the first threaded structure (19) and the second threaded structure (20) is of an anticorrosion and insulating structure. 8.The in-situ multifunctional testing device for electrochemical performance according to claim 7, wherein, The upper shell (1) and the lower shell (2) are both of a stainless steel structure. 9.The in-situ multifunctional testing device for electrochemical performance according to claim 1, wherein, The lower shell (2) is provided with a connecting portion (21) on the outer side, the connecting portion (21) is provided with a first connecting hole (22), the upper shell (1) is provided with a second connecting hole (23) corresponding to the position of the first connecting hole (22), a fastener (24) is arranged in the first connecting hole (22) and the second connecting hole (23), and the fastener (24) is located outside the cavity (3). 10.The in-situ multifunctional testing device for electrochemical performance according to any one of claims 1 to 9, characterized in that, The upper shell (1) is provided with a transparent observation window (12).

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