Multi-channel in-situ heat-force-electricity integrated solid-state battery testing device

Abstract

The utility model relates to the technical field of solid-state battery testing, and particularly discloses a multi-channel in-situ heat-force-electricity integrated solid-state battery testing device which comprises a plurality of pressure control assemblies for applying pressure to a solid-state battery, and a pressure-bearing mold assembly is detachably installed in each pressure control assembly. Each pressure-bearing mold assembly is used for transmitting the pressure of the pressure control assembly to the solid-state battery; the electrochemical workstation is used for carrying out electrochemical testing on the solid-state battery; the multiple pressure sensors, the multiple thermocouples and the multiple heating wires are electrically connected with the multi-channel temperature and pressure testing system, the pressure sensors are used for detecting the pressure borne by the solid-state battery, and the thermocouples and the heating wires are used for detecting the internal temperature of the sealing cavity and heating the solid-state battery respectively. According to the utility model, the organic combination of real-time heating temperature and pressure control and battery performance test can be realized, so as to explore the electrochemical performance of the solid-state battery at different temperatures and pressures.

Description

Technical Field

[0001] The utility model relates to the technical field of solid-state battery testing, in particular to a multi-channel in-situ thermal-mechanical-electrical integrated solid-state battery testing device. Background Art

[0002] Solid-state lithium-ion batteries have become a new star in lithium battery technology due to their excellent safety performance. In research, their electrochemical performance is particularly crucial, and the interfacial stability, especially the electrical contact at the solid phase interface, is significantly affected by pressure, which in turn affects the overall performance of the battery. In addition, temperature has a significant impact on the ionic conductivity of solid electrolytes.

[0003] To measure the ionic conductivity at different temperatures, the external heating method is usually adopted. First, the solid-state battery is placed in a test mold, and a specific pressure is applied to ensure that the positive and negative electrodes are in close contact with the electrolyte. Then, the test mold with the solid-state battery is placed in a high and low temperature constant temperature box or an oven and heated to a preset temperature and kept warm for a certain period of time. Finally, the test mold with the solid-state battery is taken out of the high and low temperature constant temperature box or the oven, and the detection part is electrically connected to the positive and negative electrodes of the solid-state battery, so as to measure the ionic conductivity of the electrolyte at the set temperature.

[0004] It can be seen that the above-mentioned testing process of the solid-state battery is very cumbersome and complex, and it is impossible to conduct in-situ thermal-mechanical-electrical integrated research on the solid-state battery, nor can it detect and control the temperature and pressure in real time, and the testing results of the electrochemical performance of the solid-state battery are inaccurate. In addition, the existing testing device only uses a single-channel test mold, and only one solid-state battery can be tested for performance in one working process, and the efficiency is very low. Summary of the Invention

[0005] The purpose of the utility model is to provide a multi-channel in-situ thermal-mechanical-electrical integrated solid-state battery testing device to solve the problems put forward in the above background art.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A multi-channel in-situ thermal-mechanical-electrical integrated solid-state battery testing device includes a plurality of pressure control components for applying pressure to the solid-state battery. A pressure-bearing mold component is detachably installed in each pressure control component. Each pressure-bearing mold component is used to store the solid-state battery in a sealed cavity formed inside and transfer the pressure of the pressure control component to the solid-state battery;

[0008] It also includes an electrochemical workstation, which is electrically connected to each solid-state battery through each pressure-bearing mold component to conduct electrochemical tests on the solid-state battery;

[0009] It further includes a multi-channel temperature and pressure test system. The multi-channel temperature and pressure test system is electrically connected to a plurality of pressure sensors, a plurality of thermocouples and a plurality of heating wires. Each of the pressure sensors can be detachably installed in the pressure control component to detect the pressure exerted on the solid-state battery. Each of the thermocouples and heating wires is installed on the pressure-bearing die component, and is respectively used to detect the internal temperature of the sealing cavity and heat the solid-state battery.

[0010] As a further solution of the present utility model, the pressure control component includes a first base body. A plurality of columns are fixedly connected to the upper side of the first base body. A second base body and a pressing plate that are both parallel to the first base body are slidably connected to the columns. The pressing plate is located below the second base body. The pressure-bearing die component and the pressure sensor are respectively detachably installed on the upper and lower sides of the pressing plate. A plurality of nuts are further arranged on the upper side of the first base body, and each of the nuts is threadedly connected to the threaded section at the top of the column.

[0011] As a further solution of the present utility model, the columns are arranged in three and are evenly arranged along the circumferential direction of the first base body.

[0012] As a further solution of the present utility model, the nuts are all set as wing nuts.

[0013] As a further solution of the present utility model, slots are respectively opened in the middle of the upper and lower sides of the pressing plate, and a plurality of tightening members are evenly arranged on the circumference of the slots;

[0014] The tightening member includes a rotating rod threadedly connected to the pressing plate, a tightening head fixedly connected to the inner end of the rotating rod, and a knob fixedly connected to the outer end of the rotating rod.

[0015] As a further solution of the present utility model, the pressure-bearing die component includes a lower pressing head and an upper pressing head. The lower pressing head includes a first base and a first current collector column fixedly connected to the upper side of the first base. The upper pressing head includes a second base and a second current collector column fixedly connected to the lower side of the second base. A heating sleeve is sleeved outside the first current collector column and the second current collector column. The solid-state battery is stored in the sealing cavity formed by the first current collector column, the second current collector column and the heating sleeve, and its positive electrode and negative electrode are respectively in contact with the second current collector column and the first current collector column;

[0016] The electrochemical workstation is electrically connected to the negative electrode and the positive electrode of the solid-state battery through the first current collector column and the second current collector column respectively.

[0017] As a further solution of the present utility model, the first base and the second base are respectively fixedly connected with a first insulating cover and a second insulating cover.

[0018] As a further solution of the present utility model, the pressure-bearing mold assembly further includes a ceramic inner liner sleeved outside the heating sleeve, an outer shell is sleeved outside the ceramic inner liner, upper end caps and lower end caps are respectively threadedly connected to the upper and lower sides of the outer shell, the upper sides of the heating sleeve and the ceramic inner liner are flush and both are in contact with the inner top wall of the outer shell, and the lower sides of the heating sleeve and the ceramic inner liner are also flush and both are in contact with the lower end cap.

[0019] As a further solution of the present utility model, a first sealing ring is sleeved outside the first current collector column;

[0020] A second sealing ring and a washer are sleeved outside the second current collector column, the washer is located above the second sealing ring and below the upper end cap.

[0021] As a further solution of the present utility model, corresponding second avoidance holes are opened on the outer shell, the ceramic inner liner and the heating sleeve, the detection end of the thermocouple is penetrated and arranged inside the second avoidance hole and is in contact with the sealing cavity;

[0022] The heating wire is embedded inside the heating sleeve, corresponding first avoidance holes are opened on the outer shell and the ceramic inner liner, and the wire electrically connected between the heating sleeve and the multi-channel temperature and pressure test system is penetrated and arranged inside the first avoidance hole.

[0023] Compared with the prior art, the present utility model has the following advantages:

[0024] 1. Through the multi-channel design, multiple solid-state batteries can be tested simultaneously, significantly shortening the test cycle and improving the test efficiency;

[0025] 2. The test accuracy is relatively high, and the actual working conditions can be simulated in the in-situ test environment to conduct an integrated thermal-mechanical-electrical research on the solid-state battery. Specifically, by setting a multi-channel temperature and pressure test system, a pressure sensor and a thermocouple to detect the temperature and pressure received by the solid-state battery in real time, and also heating and pressurizing the solid-state battery in real time through the heating wire and the butterfly nut, and setting an electrochemical workstation electrically connected to the positive and negative electrodes of each solid-state battery to explore the electrochemical performance of the solid-state battery under different temperatures and pressures;

[0026] 3. By setting a pressing plate and a tightening member in the pressure-bearing mold assembly, the uniformity of the pressure received by the solid-state battery can be ensured, which is beneficial to improving the accuracy of the test results. Description of the Drawings

[0027] The present utility model will be described in detail below with reference to the drawings and specific embodiments:

[0028] Figure 1 It is a schematic structural diagram of a multi-channel in-situ thermal-mechanical-electrical integrated solid-state battery test device provided by an embodiment of the present utility model;

[0029] Figure 2 Structural schematic diagram of the pressure control component and the pressure-bearing die component provided by the embodiment of the present utility model;

[0030] Figure 3 Exploded view of the pressure control component and the pressing die component provided by the embodiment of the present utility model;

[0031] Figure 4 Cross-sectional view of the pressure-bearing die component provided by the embodiment of the present utility model;

[0032] Figure 5 Schematic diagram of the mechanism of the pressing plate and the fastening member provided by the embodiment of the present utility model;

[0033] Figure 6 Structural schematic diagram of the heating wire provided by the embodiment of the present utility model.

[0034] The reference signs in the drawings are: 1, multi-channel temperature and pressure test system; 2, pressure sensor; 3, heating wire; 301, heating wire connection terminal; 4, thermocouple; 5, electrochemical workstation; 6, pressure control component; 601, first seat body; 602, column; 603, second seat body; 604, nut; 605, pressing plate; 605a, clamping groove; 605b, fastening member; 605b-1, rotating rod; 605b-2, knob; 605b-3, fastening head; 7, pressure-bearing die component; 701, first insulating cover; 702, lower pressing head; 702a, first base; 702b, first current collector column; 703, first sealing ring; 704, lower end cover; 705, heating sleeve; 706, ceramic inner liner; 707, outer shell; 707a, first avoidance hole; 707b, second avoidance hole; 708, second sealing ring; 709, washer; 710, upper end cover; 711, upper pressing head; 711a, second base; 711b, second current collector column; 712, second insulating cover. Detailed implementation manners

[0035] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0036] Please refer to Figures 1 to 6, A multi-channel in-situ thermal-mechanical-electrical integrated solid-state battery testing device provided by an embodiment of the present utility model includes a plurality of pressure control components 6. The pressure control components 6 are used to apply pressure to the solid-state battery. A pressure-bearing mold component 7 is detachably installed in each pressure control component 6. A sealing cavity is formed inside each pressure-bearing mold component 7 for storing the solid-state battery. The pressure-bearing mold component 7 transmits the pressure applied by the pressure control component 6 to the solid-state battery. The testing device further includes an electrochemical workstation 5 and a multi-channel temperature and pressure testing system 1 to achieve in-situ thermal-mechanical-electrical integrated testing of the solid-state battery. Specifically, each in-situ solid-state battery is electrically connected to the above-mentioned electrochemical workstation 5 through each pressure-bearing mold component 7 for electrochemical testing of the solid-state battery. The multi-channel temperature and pressure testing system 1 is electrically connected to a plurality of pressure sensors 2, a plurality of thermocouples 4, and a plurality of heating wires 3. Each pressure sensor 2 is detachably installed in the pressure control component 6 to detect the pressure received by the solid-state battery. Each thermocouple 4 and heating wire 3 are installed on the pressure-bearing mold component 7 for detecting the internal temperature of the sealing cavity and heating the solid-state battery respectively.

[0037] Therefore, this device can realize the organic combination of real-time control of heating temperature, pressure, and battery performance testing to explore the electrochemical performance of solid-state batteries under different temperatures and pressures.

[0038] Please refer to Figure 2 and Figure 3 , The pressure control component 6 provided by an embodiment of the present utility model includes a first seat body 601, a plurality of columns 602, a second seat body 603, a pressing plate 605, and a plurality of nuts 604, all preferably made of 304 stainless steel material. Among them, the plurality of columns 602 are fixedly connected to the upper side of the first seat body 601, which can be connected by welding or threading. The second seat body 603 and the pressing plate 605 are slidably connected to the columns 602 from top to bottom and are parallel to the first seat body 601. The plurality of nuts 604 are all arranged on the upper side of the first seat body 601, and each nut 604 is threadedly connected to the threaded section at the top of the column 602. The pressure-bearing mold component 7 and the pressure sensor 2 are respectively detachably installed on the upper and lower sides of the pressing plate 605. That is to say, the pressure sensor 2 is located below the pressure-bearing mold component 7. In fact, the pressure sensor 2 can also be arranged above the pressing plate 605. After the pressure-bearing mold component 7 and the pressure sensor 2 are installed in place, turning the nut 604 to drive the first seat body 601 to press down can transmit the pressure received by the solid-state battery to the pressure sensor 2 through the pressing plate 605 for detection. Finally, the pressure value received by the solid-state battery is displayed on the multi-channel temperature and pressure testing system 1.

[0039] Preferably, the number of the above-mentioned columns 602 is preferably set to three and evenly arranged along the circumferential direction of the first seat body 601. That is to say, the lines connecting the positions of the three columns 602 pairwise form an equilateral triangle, and the center of this equilateral triangle coincides with the centers of the first seat body 601, the second seat body 603, and the pressing plate 605, ensuring that the pressure received by the solid-state battery is uniform when the first seat body 601 presses downwards.

[0040] Particularly, in order to facilitate the screwing of the nuts 604 and avoid using tools such as wrenches, the above-mentioned nuts 604 are all set as wing nuts.

[0041] Particularly, clamping grooves 605a are provided on both the upper and lower sides of the pressing plate 605. The clamping grooves 605a are used for placing the pressure-bearing mold assembly 7 and the pressure sensor 2 to ensure that after the pressure-bearing mold assembly 7 and the pressure sensor 2 are installed on the pressure control assembly 6, their central axes coincide and no position offset occurs, thereby realizing uniform pressure on the solid-state battery. However, in actual situations, the sizes of the pressure-bearing mold assembly 7 and the pressure sensor 2 are different. In order to be applicable to a variety of pressure-bearing mold assemblies 7 for testing, a plurality of tightening members 605b are further provided on the clamping grooves 605a, and the plurality of tightening members 605b are evenly arranged along the circumferential direction of the clamping grooves 605a. Specifically, the tightening member 605b includes a rotating rod 605b-1 threadedly connected to the pressing plate 605, a tightening head 605b-3 fixedly connected to the inner end of the rotating rod 605b-1, and a knob 605b-2 fixedly connected to the outer end of the rotating rod 605b-1. Therefore, by rotating the knob 605b-2, under the action of the rotating rod 605b-1, the tightening head 605b-3 rotates towards the center of the pressing plate 605 to tighten the pressure-bearing mold assembly 7 or the pressure sensor 2. Among them, in order to prevent the pressure-bearing mold assembly 7 or the pressure sensor 2 from being scratched, the tightening head 605b-3 in this embodiment is preferably set as a rubber tightening head. In order to facilitate the control of the consistent inward movement distance of the plurality of tightening heads 605b-3 and make the pressure-bearing mold assembly 7 and the pressure sensor 2 located at the center of the clamping groove 605a, a scale line can also be provided on the end of the rotating rod 605b-1 connected to the knob 605b-2.

[0042] Please refer to Figure 2 、 Figure 3 and Figure 4, the pressure-bearing mold assembly 7 provided by the embodiment of the present utility model includes a lower press head 702 and an upper press head 711. The lower press head 702 includes a first base 702a and a first current collector column 702b. The first current collector column 702b is fixedly connected to the upper side of the first base 702a. The upper press head 711 includes a second base 711a and a second current collector column 711b. The second current collector column 711b is fixedly connected to the lower side of the second base 711a. A heating sleeve 705 is also sleeved outside the first current collector column 702b and the second current collector column 711b. The solid-state battery is stored in the sealed cavity formed by the first current collector column 702b, the second current collector column 711b, and the heating sleeve 705, and its positive electrode and negative electrode are respectively in contact with the second current collector column 711b and the first current collector column 702b. Among them, the first current collector column 702b is a negative electrode current collector column, and the second current collector column 711b is a positive electrode current collector column. The electrochemical workstation 5 is electrically connected to the negative electrode and the positive electrode of the solid-state battery through the first current collector column 702b and the second current collector column 711b respectively.

[0043] The above heating sleeve 705 uses cylindrical annular column heating, which can perfectly fit the solid-state battery in the sealed cavity, making the solid-state battery evenly heated.

[0044] In order to insulate the lower press head 702 and the upper press head 711, a first insulating cover 701 and a second insulating cover 712 are respectively fixedly connected to the first base 702a and the second base 711a.

[0045] Furthermore, the pressure-bearing mold assembly 7 further includes a ceramic inner liner 706 sleeved outside the heating sleeve 705, and the ceramic inner liner 706 can play a role in insulation and heat preservation. An outer shell 707 is sleeved outside the ceramic inner liner 706. The upper and lower sides of the outer shell 707 are respectively threadedly connected with an upper end cover 710 and a lower end cover 704. The outer shell, the upper end cover, and the lower end cover are preferably made of inert materials such as PTFE or PEEK. The upper sides of the heating sleeve 705 and the ceramic inner liner 706 are flush, and both are in contact with the inner top wall of the outer shell 707. The lower sides of the heating sleeve 705 and the ceramic inner liner 706 are also flush, and both are in contact with the lower end cover 704.

[0046] In order to enhance the sealing performance of the sealed cavity inside the pressure-bearing mold assembly 7, a first sealing ring 703 is sleeved outside the first current collector column 702b, and a second sealing ring 708 and a washer 709 are sleeved outside the second current collector column 711b. The washer 709 is located above the second sealing ring 708 and below the upper end cover 710.

[0047] In addition, corresponding second avoidance holes 707b are formed in the above-mentioned outer shell 707, ceramic inner liner 706, and heating sleeve 705. The detection end of the thermocouple 4 is disposed through the inside of the second avoidance hole 707b and is in contact with the sealed cavity. The heating wire 3 is embedded inside the heating sleeve 705, and the connection terminal of the heating wire 3 extends out to the outer side wall of the heating sleeve 705. Corresponding first avoidance holes 707a are formed in both the outer shell 707 and the ceramic inner liner 706. The connection terminal of the heating wire 3 is adjusted to correspond to the first avoidance hole 707a, and the wire electrically connected between the heating sleeve 705 and the multi-channel temperature and pressure testing system 1 can be disposed through the inside of the first avoidance hole 707a.

[0048] Specifically, the above-mentioned heating wire 3 is preferably arranged in a serpentine shape, so that the heat generated by it can be evenly and fully transferred to the heating sleeve 705 to uniformly heat the solid-state battery.

[0049] In addition, a temperature control unit (not shown in the drawings) is actually provided in the above-mentioned multi-channel temperature and pressure testing system 1. The temperature control unit is electrically connected to the thermocouple 4 and the heating wire 3 respectively. The temperature of the solid-state battery in the sealed cavity is detected in real time by the thermocouple 4, and the temperature is adjusted by controlling the heating wire 3 through the temperature control unit to perform in-situ testing of the battery under different temperature fields.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0051] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-channel in-situ thermal-mechanical-electrical integrated solid-state battery testing device, characterized in that: It comprises a plurality of pressure control components (6) for applying pressure to a solid-state battery, each of the pressure control components (6) being provided with a pressure-bearing mold component (7) which can be detachably mounted therein, and each of the pressure-bearing mold components (7) being used to store a solid-state battery in a sealed cavity formed therein and to transmit the pressure of the pressure control component (6) to the solid-state battery; It also includes an electrochemical workstation (5), wherein the electrochemical workstation (5) is electrically connected to each solid-state battery through each pressure-bearing mold assembly (7) to perform electrochemical testing on the solid-state battery; The invention also comprises a multi-channel temperature and pressure testing system (1), wherein the multi-channel temperature and pressure testing system (1) is electrically connected to a plurality of pressure sensors (2), a plurality of thermocouples (4) and a plurality of heating wires (3), each of the pressure sensors (2) can be detachably installed in a pressure control component (6) to detect the pressure exerted on the solid-state battery, and each of the thermocouples (4) and the heating wire (3) is installed on a pressure-bearing mold component (7) to detect the temperature inside the sealed cavity and heat the solid-state battery, respectively.

2. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 1, characterized in that: The pressure control assembly (6) comprises a first seat body (601), a plurality of columns (602) being fixedly connected to the upper side of the first seat body (601), a second seat body (603) and a pressure plate (605) being slidably connected to the columns (602), both of which are parallel to the first seat body (601), the pressure plate (605) being located below the second seat body (603), the pressure-bearing mold assembly (7) and the pressure sensor (2) being detachably mounted on the upper and lower sides of the pressure plate (605), and a plurality of nuts (604) being further arranged on the upper side of the first seat body (601), each of the nuts (604) being threadedly connected to a threaded section at the top end of the column (602).

3. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 2, characterized in that: The number of the upright posts (602) is three and they are evenly arranged along the circumference of the first seat body (601).

4. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 2, characterized in that: The nuts (604) are all configured as butterfly nuts (604).

5. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 2, characterized in that: A clamping groove (605a) is provided in the middle of both upper and lower sides of the pressing plate (605), and a plurality of tightening members (605b) are evenly arranged in the circumferential direction of the clamping groove (605a); The tightening member (605b) comprises a rotating rod (605b-1) threadedly connected to the pressure plate (605), a tightening head (605b-3) fixedly connected to the inner end of the rotating rod (605b-1), and a knob (605b-2) fixedly connected to the outer end of the rotating rod (605b-1).

6. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 1, characterized in that: The pressure-bearing mold assembly (7) comprises a lower pressure head (702) and an upper pressure head (711), the lower pressure head (702) comprising a first base (702a) and a first current collector column (702b) fixedly connected to the upper side of the first base (702a), the upper pressure head (711) comprising a second base (711a) and a second current collector column (711b) fixedly connected to the lower side of the second base (711a), the first current collector column (702b) and the second current collector column (711b) being provided with a heating sleeve (705) on the outer side, the solid-state battery being stored in a sealed cavity formed by the first current collector column (702b), the second current collector column (711b) and the heating sleeve (705), and the positive electrode and the negative electrode of the solid-state battery being respectively in contact with the second current collector column (711b) and the first current collector column (702b); The electrochemical workstation (5) is electrically connected to the negative electrode and the positive electrode of the solid-state battery through the first current collector column (702b) and the second current collector column (711b) respectively.

7. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 6, characterized in that: The first base (702a) and the second base (711a) are fixedly connected to a first insulating cover (701) and a second insulating cover (712), respectively.

8. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 6, characterized in that: The pressure-bearing mold assembly (7) further comprises a ceramic liner (706) sleeved on the outside of the heating sleeve (705); the outer shell (707) is sleeved on the outer side of the ceramic liner (706); the upper and lower sides of the outer shell (707) are respectively threadedly connected with an upper end cover (710) and a lower end cover (704); the upper sides of the heating sleeve (705) and the ceramic liner (706) are flush with each other and both abut against the inner top wall of the outer shell (707); the lower sides of the heating sleeve (705) and the ceramic liner (706) are also flush with each other and both abut against the lower end cover (704).

9. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 8, characterized in that: A first sealing ring (703) is sleeved on the outer side of the first current collector column (702b); A second sealing ring (708) and a gasket (709) are sleeved on the outer side of the second current collector column (711b); the gasket (709) is located on the upper side of the second sealing ring (708) and on the lower side of the upper end cover (710).

10. The multi-channel in-situ thermal-mechanical-electrical solid-state battery testing device according to claim 8, characterized in that: The outer shell (707), the ceramic liner (706) and the heating sleeve (705) are all provided with corresponding second avoidance holes (707b); the detection end of the thermocouple (4) is arranged through the inner side of the second avoidance hole (707b) and is in contact with the sealed cavity; The heating wire (3) is embedded in the heating sleeve (705), and the outer shell (707) and the ceramic inner shell (706) are both provided with corresponding first avoidance holes (707a), and the wire electrically connected between the heating sleeve (705) and the multi-channel temperature and pressure testing system (1) is arranged to pass through the inside of the first avoidance hole (707a).

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