A gas permeability tester using high and low temperature pressure difference method

Abstract

The present invention discloses a high-low temperature pressure difference method gas permeability tester, which relates to the field of battery diaphragm detection technology, and includes: a detection box, with second drive structures installed on both sides of the interior, and the output ends of two groups of the second drive structures are respectively installed with a first detection module and a second detection module; a sample area, which is arranged inside the detection box and is located between the first detection module and the second detection module, and a storage area extending inward is arranged on one side of the sample area; a fixed frame, which is installed inside the sample area through a lifting assembly; a temperature control frame, which is installed in the storage area through the first drive structure, and moves between the storage area and the outside of the fixed frame based on the first drive structure. During detection, the present invention can detect multiple battery diaphragm samples at the same time, thereby increasing the number of sample data and improving the accuracy of detection, and during detection, the detection method is simple, easy to use and operate.

Description

Technical Field

[0001] The invention relates to the technical field of battery diaphragm detection, and in particular to a high-low temperature pressure difference method gas permeability tester. Background Art

[0002] The battery separator is a very critical part of the battery. It is a functional membrane material with a microporous structure. Its function is to isolate the positive and negative electrodes, allow ions to pass through, improve safety, control the battery's internal resistance and capacity, and regulate the battery's internal pressure.

[0003] During the use of battery separators, temperature will affect the air permeability of the battery separators. As the temperature rises, the molecular movement of the separator material will intensify, and the distance between molecules may increase, causing the pore structure of the separator to change. This change may make it easier for gas molecules to pass through the separator, thereby improving the air permeability of the separator. On the contrary, in a low temperature environment, the molecular movement of the separator material slows down, and the pore structure may become tighter, resulting in reduced permeability.

[0004] Therefore, when producing battery separators, some manufacturers will test the stability of the battery separators in different environments.

[0005] After searching, a Chinese patent (publication number: CN205666276U) discloses a battery diaphragm permeability detection device, in which the bottom end of the hollow spiral lifting rod of the patent is fixed to the middle of the lower steel plate, the hollow bottom support is screwed to the top of the hollow spiral lifting rod, a support body is provided on the hollow bottom support, and the interior of the support body is provided with air holes connected up and down, and the upper part of the support body is provided with a horizontal placement surface for placing the battery diaphragm, a pressurizing device is fixed to the upper steel plate, and the upper part of the pressurizing device is provided with a tray for placing weights, and the bottom of the tray is connected to the piston inside the pressurizing device through a connecting rod, and the bottom of the pressurizing device is screwed with a pressure block through a sealing gasket, and the interior of the pressure block is provided with an air hole connected to the pressurizing device, and the bottom of the pressure block is provided with a gasket for sealing and pressing the battery diaphragm.

[0006] In the prior art, when testing the diaphragm, how to improve the accuracy of the gas permeability test of the battery diaphragm at different temperatures, and reduce the difficulty of using related equipment during the test, and effectively control the cost, is one of the research and development directions. Therefore, the present invention proposes a high and low temperature pressure difference method gas permeability tester. Summary of the invention

[0007] The object of the present invention is to provide a high-low temperature pressure difference method gas permeability tester to solve the technical problems mentioned in the above background technology.

[0008] The technical problem to be solved by the present invention can be achieved by the following technical solution: A high-low temperature pressure difference method gas permeability tester, comprising a base, a detection box and an auxiliary module are installed on the upper side of the base, and the auxiliary module includes a gas transmission device and a cooling component;

[0009] The second driving structures are installed on both sides of the interior of the detection box, and the first detection module and the second detection module are installed at the output ends of the two groups of the second driving structures respectively. A sample area is provided inside the detection box between the two groups of the second driving structures, and a connecting port is provided on the upper side of the sample area of ​​the detection box, and a temperature adjustment module is installed on one side of the first detection module inside the detection box. The temperature adjustment module heats or cools the detection gas based on the temperature required for the detection and then delivers it to the interior of the first detection module;

[0010] A lifting assembly is installed inside the sample area, a fixing frame is installed at the output end of the lifting assembly, a sample reinforcement frame is installed at the lower side of the fixing frame, and the battery diaphragm sample to be tested is installed inside the sample reinforcement frame;

[0011] After the lifting assembly is started, the sample reinforcement frame is moved up and down along the connecting port by the fixing frame. After the sample reinforcement frame is moved out of the detection box from the connecting port, the user can separate the sample reinforcement frame from the fixing frame, and after the fixing frame lowers the sample reinforcement frame to the inside of the base, the fixing frame seals the connecting port.

[0012] A storage area extending outward is provided on one side of the sample area inside the detection box, and the storage area is arranged perpendicular to the moving direction of the output ends of the two sets of second drive structures;

[0013] A first driving structure is installed inside the storage area, and a temperature control rack is installed at the output end of the first driving structure;

[0014] After the first driving structure is started, the temperature control frame is driven to move toward the sample area and is sleeved on the outside of the sample reinforcement frame, and the temperature of the battery diaphragm sample inside the sample reinforcement frame is regulated to preheat or precool it;

[0015] A plurality of pressurized chambers are provided inside the first detection module, and a first pressure detection unit is installed inside each of the pressurized chambers, and each first pressure detection unit is used to monitor the pressure inside the corresponding pressurized chamber;

[0016] The gas delivery device delivers the detection gas of the required pressure to each pressurized chamber after the temperature is adjusted by the temperature adjustment module;

[0017] A plurality of pressure difference chambers are provided inside the second detection module, and the distribution position of each pressure difference chamber corresponds to the distribution position of each pressurization chamber;

[0018] A gas detection unit and a second pressure detection unit are installed inside the plurality of pressure differential chambers. Each second pressure detection unit is used to monitor the pressure inside the corresponding pressure differential chamber, and each gas detection unit is used to monitor the content of the detection gas inside the corresponding pressure differential chamber.

[0019] As a further solution of the present invention: the sample reinforcement rack comprises a first assembly rack and a second assembly rack, and the first assembly rack and the second assembly rack are combined together when in use;

[0020] A plurality of first placement slots are provided inside the second assembly rack, and the distribution positions of the first placement slots correspond to the distribution positions of the pressurizing bins and the pressure difference bins;

[0021] A step portion is provided at the inner edge of each first placement groove;

[0022] A plurality of second placement slots are provided inside the first assembly rack, and the distribution position of each second placement slot corresponds to the distribution position of each first placement slot;

[0023] An extension frame is installed inside each of the second placement slots, and the size of each extension frame corresponds to the size of the first placement slot;

[0024] Before assembly, each battery diaphragm sample is installed in each first placement groove, and the edge of the battery diaphragm sample is placed on the step portion corresponding to the first placement groove. After the first assembly rack is assembled with the second assembly rack, the extension frame of each second placement groove in the first assembly rack is abutted against one side of the corresponding step portion to fix the battery diaphragm sample;

[0025] A fixing groove is provided on the lower side of the fixing frame. After the first assembly frame and the second assembly frame are assembled, the top of the first assembly frame and the second assembly frame are installed inside the fixing groove.

[0026] As a further solution of the present invention: each of the pressurized chambers is provided with a first sealing tube on one side facing the sample reinforcement rack, and each of the differential pressure chambers is provided with a second sealing tube on one side facing the sample reinforcement rack;

[0027] The size of each of the first sealing tube and the second sealing tube corresponds to the inner size of the extension frame;

[0028] After the first detection module and the second detection module are moved to one side of the sample reinforcement rack, the first sealing tube of each pressurized chamber is embedded into the corresponding step portion or extension frame, and the second sealing tube of each pressure difference chamber is embedded into the corresponding extension frame or step portion.

[0029] As a further solution of the present invention: the temperature control frame includes a connecting frame, the connecting frame is connected to the output end of the first driving structure, and both sides of the connecting frame are installed with moving frames through the travel assembly;

[0030] When the two groups of mobile racks move, they move to the two sides of the sample reinforcement rack respectively, and after the movement, the two groups of mobile racks adjust the distance from the sample reinforcement rack through the travel component.

[0031] As a further solution of the present invention: a plurality of temperature control components are installed inside the two groups of mobile racks;

[0032] The multiple temperature control components are divided into multiple heating units and multiple cooling units;

[0033] The plurality of heating units and the plurality of cooling units are arranged in a plurality of rows, and the heating units and the cooling units in each row are arranged alternately.

[0034] As a further solution of the present invention: the sample reinforcement rack is provided with a heating height, a cooling height and a detection height inside the detection box;

[0035] The positions of the heating height and the cooling height are set based on each column of heating units and each column of cooling units.

[0036] As a further solution of the present invention: each of the first sealing tubes comprises a tube body, a sealing ring is installed on the outer side of the tube body, and a connecting ring connected to the sealing ring is opened inside the tube body;

[0037] When the pressure inside the pressurized chamber increases, the gas enters the sealing ring from the connecting ring, thereby improving the sealing performance between the sealing ring and the step portion or the extension frame.

[0038] As a further solution of the present invention: a plurality of communication chambers connected to the sealing ring are provided inside the tube body, and an elastic member is installed on the outer side of one end of each communication chamber connected to the tube body;

[0039] A connecting piece is installed between each of the elastic pieces and the sealing ring;

[0040] When the internal pressure of the pressurized chamber increases, each elastic member is compressed and supports the sealing ring through the connecting member.

[0041] As a further solution of the present invention: a heating channel and a cooling channel are arranged inside the temperature control module, the gas supply device is connected with the heating channel and the cooling channel, and an electromagnetic valve body is arranged at the connecting part between the gas supply device and the heating channel and the cooling channel, which is used to change the connecting path, thereby facilitating the user to switch between the heating channel and the cooling channel.

[0042] Beneficial effects of the present invention:

[0043] The present invention can detect multiple battery separator samples at the same time during detection, thereby increasing the amount of sample data and improving the accuracy of detection. In addition, the detection method is simple and convenient to use and operate.

[0044] Furthermore, the present invention can preheat or precool the battery diaphragm sample in the sample reinforcement frame through the temperature control frame, thereby improving the detection efficiency and improving the consistency of the performance on both sides of the battery diaphragm sample, thereby improving the detection accuracy;

[0045] On the other hand, during testing, each pressurized chamber and pressure differential chamber contacts each battery diaphragm sample in the sample reinforcement rack individually, and the contact parts are provided with sealing components, which can avoid leakage of the test gas due to high pressure during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of a high and low temperature pressure difference method gas permeability tester;

[0047] Figure 2 is a side cross-sectional view of a sample area and a storage area in a base of the present invention;

[0048] Figure 3 is a bottom cross-sectional view of the sample reinforcement frame of the present invention;

[0049] Figure 4 is a front cross-sectional view of the detection box of the present invention;

[0050] Figure 5 The present invention Figure 4 A magnified view of the structure of part A;

[0051] Figure 6 is a partial side sectional view of the first sealing tube in the present invention;

[0052] Wherein: 1. base; 2. detection box; 3. lifting component; 4. fixed frame; 5. sample reinforcement frame; 6. first drive structure; 7. temperature control frame; 8. second drive structure; 9. first detection module; 10. second detection module; 11. pressurization chamber; 12. temperature adjustment module; 13. first pressure detection unit; 14. pressure difference chamber; 15. gas detection unit; 16. second pressure detection unit; 17. auxiliary module; 51. first assembly frame; 52. second assembly frame; 53. first placement slot; 54. second placement slot; 111. first sealing tube; 141. second sealing tube; 71. connecting frame; 72. stroke component; 73. moving frame; 74. temperature control component; 1111. tube body; 1112. sealing ring; 1113. elastic member; 1114. connecting member. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] like Figure 1-6 As shown, a high-low temperature pressure difference method gas permeability tester includes a base 1, a detection box 2 and an auxiliary module 17 are installed on the upper side of the base 1, and the auxiliary module 17 includes a gas delivery device and a cooling component;

[0055] The cooling component in this embodiment adopts a liquid nitrogen cooling structure, including a pumping unit and a feeding unit, and the feeding unit is connected to the pumping unit for accurately controlling the flow rate;

[0056] Second drive structures 8 are installed on both sides of the interior of the detection box 2, and the output ends of the two groups of second drive structures 8 are respectively installed with a first detection module 9 and a second detection module 10. A sample area is provided between the two groups of second drive structures 8 inside the detection box 2, and a connecting port is provided on the upper side of the sample area of ​​the detection box 2, and a temperature adjustment module 12 is installed on one side of the first detection module 9 inside the detection box 2. The temperature adjustment module 12 heats or cools the detection gas based on the temperature required for detection, and then delivers it to the interior of the first detection module 9;

[0057] A heating channel and a cooling channel are provided inside the temperature control module 12, and a gas delivery device is connected with the heating channel and the cooling channel, and a solenoid valve body is provided at the communicating portion between the gas delivery device and the heating channel and the cooling channel, for changing the communicating path, so as to facilitate the user to switch between the heating channel and the cooling channel;

[0058] The heating channel includes an electric heating assembly;

[0059] The cooling channel includes a heat exchange component and a connecting pipeline, and the connecting pipeline is connected to the pumping unit in the cooling component;

[0060] A lifting assembly 3 is installed inside the sample area. The lifting assembly 3 adopts a lifting cylinder structure in this embodiment. A fixing frame 4 is installed at the output end of the lifting assembly 3. A sample reinforcement frame 5 is installed at the lower side of the fixing frame 4. The battery diaphragm sample to be tested is installed inside the sample reinforcement frame 5.

[0061] After the lifting assembly 3 is started, the sample reinforcement rack 5 is moved up and down along the connecting port through the fixing rack 4. After the sample reinforcement rack 5 is moved out of the detection box 2 from the connecting port, the user can separate the sample reinforcement rack 5 from the fixing rack 4. After the fixing rack 4 lowers the sample reinforcement rack 5 to the inside of the base 1, the fixing rack 4 seals the connecting port.

[0062] A storage area extending outward is provided on one side of the sample area inside the detection box 2, and the storage area is arranged perpendicular to the moving direction of the output ends of the two sets of second driving structures 8;

[0063] A first driving structure 6 is installed inside the storage area, and a temperature control frame 7 is installed at the output end of the first driving structure 6;

[0064] In this embodiment, the first driving structure 6 and the two sets of second driving structures 8 both adopt a screw structure;

[0065] After the first driving structure 6 is started, it drives the temperature control frame 7 to move toward the sample area, and is set on the outside of the sample reinforcement frame 5, and regulates the temperature of the battery diaphragm sample inside the sample reinforcement frame 5, and preheats or precools it;

[0066] A plurality of pressurized chambers 11 are provided inside the first detection module 9, and a first pressure detection unit 13 is installed inside each pressurized chamber 11. Each first pressure detection unit 13 is used to monitor the pressure inside the corresponding pressurized chamber 11;

[0067] The gas delivery device delivers the detection gas of the required pressure to each pressurized chamber 11 after the temperature is adjusted by the temperature adjustment module 12;

[0068] A plurality of pressure difference chambers 14 are provided inside the second detection module 10, and the distribution position of each pressure difference chamber 14 corresponds to the distribution position of each pressurization chamber 11;

[0069] Gas detection units 15 and second pressure detection units 16 are installed inside multiple pressure difference chambers 14. Each second pressure detection unit 16 is used to monitor the pressure inside the corresponding pressure difference chamber 14, and each gas detection unit 15 is used to monitor the content of detection gas inside the corresponding pressure difference chamber 14.

[0070] By monitoring the pressure inside the pressurized chamber 11 and the corresponding pressure difference chamber 14, the pressure difference on both sides of the corresponding battery separator sample is obtained.

[0071] like Figure 3 As shown, the sample reinforcement rack 5 includes a first assembly rack 51 and a second assembly rack 52. When the first assembly rack 51 and the second assembly rack 52 are used, the two are combined together;

[0072] In this embodiment, the first assembly rack 51 and the second assembly rack 52 are assembled by magnetic attraction;

[0073] A plurality of first placement slots 53 are provided inside the second assembly rack 52, and the distribution positions of the first placement slots 53 correspond to the distribution positions of the pressurizing chambers 11 and the pressure difference chambers 14;

[0074] A step portion is provided at the inner edge of each first placement groove 53;

[0075] A plurality of second placement slots 54 are provided inside the first assembly rack 51, and the distribution positions of the second placement slots 54 correspond to the distribution positions of the first placement slots 53;

[0076] An extension frame is installed inside each second placement slot 54, and the size of each extension frame corresponds to the size of the first placement slot 53;

[0077] Before assembly, each battery diaphragm sample is installed in each first placement groove 53, and the edge of the battery diaphragm sample is placed on the step portion corresponding to the first placement groove 53. After the first assembly rack 51 is assembled with the second assembly rack 52, the extension frame of each second placement groove 54 in the first assembly rack 51 abuts against one side of the corresponding step portion to fix the battery diaphragm sample;

[0078] A fixing groove is provided on the lower side of the fixing frame 4. After the first assembly frame 51 and the second assembly frame 52 are combined, their tops are installed inside the fixing groove. In this embodiment, a plurality of screw-connected reinforcement pieces are installed on the side of the fixing frame 4. After the sample reinforcement frame 5 and the fixing frame 4 are assembled, the sample reinforcement frame 5 and the fixing frame 4 are fixed by the reinforcement pieces.

[0079] like Figure 4 As shown, each pressurized chamber 11 is installed with a first sealing tube 111 on one side facing the sample reinforcement frame 5, and each differential pressure chamber 14 is installed with a second sealing tube 141 on one side facing the sample reinforcement frame 5;

[0080] The size of each first sealing tube 111 and the size of the second sealing tube 141 correspond to the inner size of the extension frame;

[0081] After the first detection module 9 and the second detection module 10 are moved to one side of the sample reinforcement rack 5, the first sealing tube 111 of each pressurized chamber 11 is embedded into the corresponding step portion, and the second sealing tube 141 of each pressure difference chamber 14 is embedded into the corresponding extension frame.

[0082] like Figure 5 As shown, the temperature control frame 7 includes a connecting frame 71, the connecting frame 71 is connected to the output end of the first driving structure 6, and both sides of the connecting frame 71 are installed with a moving frame 73 through a stroke assembly 72;

[0083] When moving, the two groups of movable racks 73 move to the two sides of the sample reinforcement rack 5 respectively, and after moving, the two groups of movable racks 73 adjust the distance from the sample reinforcement rack 5 through the travel assembly 72 .

[0084] Multiple temperature control components 74 are installed inside the two sets of mobile racks 73;

[0085] The plurality of temperature control components 74 are divided into a plurality of heating units and a plurality of cooling units;

[0086] The plurality of heating units and the plurality of cooling units are arranged in a plurality of rows, and the heating units and the cooling units in each row are arranged alternately;

[0087] In this embodiment, the heating unit adopts an electromagnetic heating structure, and each cooling unit is connected to the pumping unit of the cooling assembly through a separate connecting pipeline;

[0088] The pumping unit independently controls the liquid nitrogen delivery flow rate in the cooling channel and the cooling unit, and the delivery method and flow control method of the liquid nitrogen adopt any mature solution in the prior art to reduce costs;

[0089] The sample reinforcement rack 5 is provided with a heating height, a cooling height and a detection height inside the detection box 2;

[0090] The positions of the heating height and the cooling height are set based on each column of heating units and each column of cooling units.

[0091] like Figure 6 As shown, each first sealing tube 111 includes a tube body 1111, a sealing ring 1112 is installed on the outer side of the tube body 1111, a plurality of communication chambers connected with the sealing ring 1112 are opened inside the tube body 1111, and an elastic member 1113 is installed on the outer side of one end of each communication chamber connected with the tube body 1111;

[0092] A connecting piece 1114 is installed between each elastic piece 1113 and the sealing ring 1112;

[0093] When the internal pressure of the pressurized chamber 11 increases, each elastic member 1113 is compressed and supports the sealing ring 1112 through the connecting member 1114 .

[0094] Working principle of the present invention:

[0095] First, start the lifting assembly 3 to lift the fixing frame 4 and the sample reinforcement frame 5 from the detection box 2, then disassemble the sample reinforcement frame 5 and the fixing frame 4, and then place each battery separator sample of 2.5 cm*2.5 cm in size inside each first placement groove 53 in the second assembly frame 52, then combine the first assembly frame 51 with the second assembly frame 52, and then reassemble the first assembly frame 51 and the second assembly frame 52 with the fixing frame 4;

[0096] Then the lifting assembly 3 lowers the sample reinforcement rack 5 to the inside of the detection box 2, the first driving structure 6 is started, and the temperature control rack 7 is moved to the outside of the sample reinforcement rack 5, and the lifting assembly 3 moves each battery diaphragm sample to the corresponding heating height or cooling height in the temperature control rack 7 based on the temperature required for the test, corresponding to each column of heating units and each column of cooling units;

[0097] Then, each travel component 72 in the temperature control frame 7 is started, and the mobile frames 73 on both sides of the sample reinforcement frame 5 are moved to one side of the sample reinforcement frame 5 to control the temperature of the battery diaphragm sample. After the temperature of the battery diaphragm sample is adjusted, the first driving structure 6 drives the temperature control frame 7 to reset;

[0098] Then, the two sets of second driving structures 8 are started, and the first detection module 9 and the second detection module 10 are respectively moved to the two sides of the sample reinforcement frame 5, and each pressurizing chamber 11 and each pressure difference chamber 14 are respectively attached to the two sides of a group of battery diaphragm samples, and the corresponding first sealing tube 111 is embedded in the corresponding first placement groove 53, and the second sealing tube 141 is embedded in the second placement groove 54;

[0099] The gas delivery device is started, and the detection gas with the required pressure is temperature-controlled by the temperature control module 12 and then delivered to each pressurized chamber 11;

[0100] The first pressure detection unit 13 in the pressurized chamber 11 monitors the pressure in the corresponding pressurized chamber 11 to obtain the pressure a;

[0101] The second pressure detection unit 16 in the pressure difference chamber 14 monitors the pressure in the pressure difference chamber 14 and obtains the pressure b, then the pressure difference on both sides of the corresponding battery diaphragm sample is |pressure a-pressure b|;

[0102] In this embodiment, the gas delivery device actively adjusts the pressure in the pressurized chamber 11 to control the pressure difference on both sides of the battery diaphragm sample to be within a preset fluctuation threshold;

[0103] Finally, the data monitored by the gas detection unit 15 in each pressure difference chamber 14 whose pressure difference is within the preset fluctuation threshold is taken as the measurement data, and each battery diaphragm sample whose pressure difference is outside the fluctuation threshold is marked. After the monitoring is completed, the marked battery diaphragm samples are tested.

[0104] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high and low temperature pressure difference method gas permeability tester, characterized in that: include: A detection box (2) having second drive structures (8) installed on both sides thereof, and output ends of two groups of the second drive structures (8) being respectively installed with a first detection module (9) and a second detection module (10); A fixing frame (4) is installed inside the detection box (2) via a lifting assembly (3) and is arranged between the first detection module (9) and the second detection module (10); A sample reinforcement frame (5) is connected to the fixing frame (4) and has a plurality of battery separator samples installed therein; A temperature control frame (7) is installed inside the detection box (2) via a first driving structure (6) and is arranged on one side of the sample reinforcement frame (5), and the temperature control frame (7) moves between the storage area and the outer side of the fixed frame (4) based on the first driving structure (6); A pressurizing chamber (11), wherein a plurality of the pressurizing chambers (11) are disposed inside the first detection module (9), and a first pressure detection unit (13) is installed inside each pressurizing chamber (11); A pressure differential chamber (14), wherein a plurality of the pressure differential chambers (14) are disposed inside the second detection module (10), and a gas detection unit (15) and a second pressure detection unit (16) are installed inside each pressure differential chamber (14); The distribution positions of the pressure difference chambers (14) correspond to the distribution positions of the pressurization chambers (11); A temperature adjustment module (12) is installed inside the detection box (2) and is connected to each pressurized chamber (11); The temperature control frame (7) comprises a connecting frame (71), the connecting frame (71) is connected to the output end of the first driving structure (6), and moving frames (73) are installed on both sides of the connecting frame (71) through travel components (72); When moving, the two groups of movable racks (73) respectively move to the two sides of the sample reinforcement rack (5), and the distance from the sample reinforcement rack (5) is adjusted by the travel assembly (72); A plurality of temperature control components (74) are installed inside the two groups of movable racks (73); The plurality of temperature control components (74) are divided into a plurality of heating units and a plurality of cooling units; The plurality of heating units and the plurality of cooling units are arranged in a plurality of rows, and the heating units and the cooling units in each row are arranged alternately; The sample reinforcement frame (5) is provided with a heating height, a cooling height and a detection height at a height inside the detection box (2); The positions of the heating height and the cooling height are set based on each row of heating units and each row of cooling units.

2. A high and low temperature pressure difference method gas permeability tester according to claim 1, characterized in that: The sample reinforcement rack (5) comprises a first assembly rack (51) and a second assembly rack (52); A plurality of first placement slots (53) are provided inside the second assembly rack (52), and the distribution position of each first placement slot (53) corresponds to the distribution position of each pressurizing chamber (11) and pressure difference chamber (14); A step portion is provided at the inner edge of each first placement groove (53); A plurality of second placement slots (54) are provided inside the first assembly rack (51), and the distribution position of each second placement slot (54) corresponds to the distribution position of each first placement slot (53); An extension frame is installed inside each of the second placement grooves (54), and the size of each extension frame corresponds to the size of the first placement groove (53).

3. The high and low temperature pressure difference method gas permeability tester according to claim 1, characterized in that: A first sealing tube (111) is installed on the side of each of the pressurized chambers (11) facing the sample reinforcement rack (5), and a second sealing tube (141) is installed on the side of each of the pressure difference chambers (14) facing the sample reinforcement rack (5); The dimensions of each of the first sealing tubes (111) and the second sealing tubes (141) correspond to the internal dimensions of the extension frame.

4. The high and low temperature pressure difference method gas permeability tester according to claim 3, characterized in that: Each of the first sealing tubes (111) comprises a tube body (1111), a sealing ring (1112) is installed on the outside of the tube body (1111), and a connecting ring connected to the sealing ring (1112) is provided inside the tube body (1111).

5. The high and low temperature pressure difference method gas permeability tester according to claim 3, characterized in that: Each of the first sealing tubes (111) comprises a tube body (1111), and a sealing ring (1112) is installed on the outer side of the tube body (1111); A plurality of communication chambers connected to the sealing ring (1112) are provided inside the tube body (1111), and an elastic member (1113) is installed on the outer side of one end of each communication chamber connected to the tube body (1111); A connecting piece (1114) is installed between each of the elastic pieces (1113) and the sealing ring (1112).

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