Energy storage and heat conduction structural adhesive testing device and method

Abstract

The invention discloses an energy-storage heat-conducting structural adhesive testing device and method, and belongs to the technical field of material thermal performance test.The energy-storage heat-conducting structural adhesive testing device comprises a bearing plate arranged on a pipeline stand column and a plurality of testing sets located on the bearing plate, and each testing set comprises a master control box, a pressure sensing assembly, a heating assembly and a guiding assembly; the pressure sensing assembly can perform intelligent pressure control on a to-be-tested sample, heat-conducting property deviation under different pressures is eliminated, the heating assembly adopts a graphene heating film to realize an automatic frequency modulation function, so that the heating temperature is uniform and constant, and the guiding assembly comprises a pressing plate, a guiding column, an electromagnet and a strong magnet which are located above the heating assembly. According to the invention, axial and planar heat conduction performance tests can be carried out on the to-be-tested sample, simultaneous multi-station tests are also realized, the accuracy of comparison tests under the same working condition is ensured, and the test precision and the working stability of the heat conduction performance of the to-be-tested sample are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of material thermal performance testing, and in particular relates to a device and method for testing energy storage thermal conductive structural adhesive. Background Art

[0002] The current energy storage industry within the new energy sector is dominated by liquid-cooled energy storage products. Battery modules are often called the "heart" of energy storage products, and the core thermal conductive material of liquid cooling modules is the polyurethane thermal conductive structural adhesive that connects the bottom of the battery cell to the water-cooling plate. The reliability of the polyurethane thermal conductive structural adhesive determines the thermal and structural performance of the liquid cooling module. In continuous batch production, if the quality of the polyurethane thermal conductive structural adhesive cannot be determined in real time, there is a high probability of losing control of the thermal conductive structural adhesive and causing quality problems in the liquid cooling module. Therefore, competitiveness in the energy storage market ultimately depends on the competitiveness of battery module technology. This technological advancement directly guides the direction of the entire energy storage industry, and therefore technological innovation in battery modules is imminent.

[0003] Generally speaking, the thermal conductivity of a liquid-cooled module depends primarily on the performance and quality of the polyurethane thermally conductive structural adhesive that connects the bottom of the battery cell to the water-cooling plate. Mass production of liquid-cooled modules relies on automated production lines. However, due to the lack of real-time performance and quality testing technology for the polyurethane thermally conductive structural adhesive before and during batch dispensing, it is difficult to ensure that the thermal conductivity parameters of each batch of polyurethane thermally conductive structural adhesive are consistent with those of the sample. This significantly reduces the efficiency of heat transfer from the battery cell to the water-cooling plate, affecting the cell's heat dissipation performance. Rising cell temperatures increase the temperature difference between cells, shortening cell life and even posing the risk of thermal runaway in severe cases. Therefore, it is crucial to effectively and efficiently test the thermal performance parameters of the "thermal conductive structural adhesive," a core, common material that connects the upper and lower layers of liquid-cooled battery modules. Whether the thermal performance parameters of the thermally conductive structural adhesive meet design requirements determines the success or failure of the liquid-cooled module's heat dissipation. A breakthrough in the technology for quickly and accurately testing the comprehensive thermal conductivity of the thermally conductive structural adhesive is urgently needed.

[0004] Currently, the thermal conductivity of the thermally conductive adhesive used in energy storage liquid cooling modules is generally determined based on a single thermal conductivity test report provided by the supplier. Most energy storage integration companies lack professional in-house thermal conductivity testers and rely solely on the supplier's thermal conductivity test report for proofing, trial production, and mass production. This lacks a means to verify the thermal conductivity parameters of the thermally conductive adhesive. Since the thermally conductive adhesive is a 1:1 mixture of component A and component B by volume, the mixing is inherently uneven, resulting in varying thermal conductivity at different locations and, consequently, variations in thermal conductivity. Thermal conductivity testers are limited in their ability to directly measure the thermal conductivity of a small area within a sample. Due to their high price and bulk, thermal conductivity testers cannot be efficiently adapted for random sampling during production, and their cost is very high. Furthermore, it is difficult to individually test the thermal conductivity of other materials used in energy storage, such as aluminum bars, insulation materials, and plastics, to compare them against standard products. Therefore, there is an urgent need to provide a testing device and method for energy storage thermal conductive structural adhesive to solve the above-mentioned technical problems. Summary of the Invention

[0005] In view of this, the present invention provides a testing device and method for energy storage thermal conductive structural adhesives, which can intelligently control the pressure of the sample to be tested, eliminate thermal conductivity deviations under different pressures, and perform axial and planar thermal conductivity tests on the sample to be tested. It also realizes simultaneous multi-station testing, ensuring the accuracy of comparative tests under the same working conditions. The following technical solutions are specifically adopted to achieve this.

[0006] In a first aspect, the present invention provides a device for testing an energy storage thermal conductive structural adhesive, the device comprising a pipeline column, a bearing plate disposed on the pipeline column, and a plurality of test groups located on the bearing plate;

[0007] The test group includes a master control box, a pressure sensing component, a heating component, and a guide component. The master control box is arranged on the lower surface of the carrier plate and is electrically connected to the pressure sensing component located on the upper surface of the carrier plate. The heating component is arranged on the pressure sensing component. The guide component includes a pressure plate located above the heating component, a guide column vertically connected to the pressure plate, and an electromagnet arranged on the carrier plate. The electromagnet is located between the pressure sensing component and the guide column. A strong magnet corresponding to the electromagnet is embedded in the pressure plate, and the electromagnet is electrically connected to the master control box.

[0008] The master control box receives the pressure value of the pressure sensing component and sends a power-on connection instruction to the electromagnet. The electromagnet generates a force with the strong magnet according to the power-on connection instruction to form a thermal conductive test space for placing the sample to be tested between the pressure plate and the heating component, wherein the power-on connection instruction includes the positive and negative pole connection method of the electromagnet and the current intensity.

[0009] As a preferred embodiment of the above technical solution, the test group also includes a telescopic component, which includes a telescopic motor electrically connected to the master control box, a linear bearing and a telescopic sealing ring passing through the supporting plate, one end of the linear bearing is assembled with the telescopic rod of the telescopic motor, and the other end of the linear bearing is sleeved in the telescopic sealing ring, and the lower end of the telescopic sealing ring is fixed to the upper surface of the supporting plate.

[0010] As a preferred embodiment of the above technical solution, the pressure sensing component includes a base plate arranged at the upper end of the telescopic sealing ring, a pressure sensor located on the upper surface of the base plate, and a heat insulation layer arranged on the pressure sensor.

[0011] As a preferred embodiment of the above technical solution, the heating assembly includes a base arranged on the pressure sensor and a heating block located on the base, and the thermal insulation layer is installed between the base and the pressure sensor.

[0012] As a preferred embodiment of the above technical solution, the heating block is provided with a graphene heating film bonded to the thermal insulation layer and a plurality of evenly distributed temperature detection points. The heating surface of the graphene heating film is bonded to the base, and the plurality of temperature detection points are electrically connected to the master control box through wire grooves arranged diagonally on the upper surface of the heating block.

[0013] As a preferred embodiment of the above technical solution, the testing device further includes an isolation cover mounted on the multiple test groups, the multiple test groups are arranged in parallel in pairs, and the isolation cover is used to isolate and insulate each test group from the external environment.

[0014] As a preferred embodiment of the above technical solution, an air valve is provided at the bottom of one side of the pipeline column, and the pressure relief switch of the air valve is electrically connected to the master control box.

[0015] As a preferred embodiment of the above technical solution, the sample to be tested includes at least one of thermal conductive structural adhesive, aluminum alloy, copper alloy, plastic pad or thermal insulation sheet.

[0016] As a preferred embodiment of the above technical solution, the testing device also includes a color-changing indicator light arranged on the carrier plate and corresponding to each of the test groups, the color-changing indicator light is electrically connected to the main control box, and the main control box includes data acquisition function, data processing function, communication function, input and output control function, display function and alarm function.

[0017] In a second aspect, the present invention further provides a method for testing an energy storage thermal conductive structural adhesive, which is applied to the above-mentioned energy storage thermal conductive structural adhesive testing device, comprising the following steps:

[0018] S1: The main control box is powered on, and the display on the main control box lights up to display the status of each data collection. If the display status is normal, proceed to the next step; if the display status is abnormal, debug and check until it is normal before proceeding to the next step, wherein the power P of the heating block, the pressure F of the pressure sensor, the telescopic size L of the telescopic motor and the current I of the electromagnet are preset, as well as the temperature Ta0 collected by the middle temperature probe point on the pressure plate, the temperature Ta2 collected by the left temperature probe point at the diagonal position, and the temperature Ta3 collected by the right temperature probe point at the diagonal position, the temperature Tb0 collected by the middle temperature probe point on the heating block, the temperature Tb1 collected by the left temperature probe point at the diagonal position, and the temperature T collected by the environment temperature probe point inside the isolation cover;

[0019] S2: Control the positive and negative poles of the four electromagnets to be connected in reverse, and generate magnetic repulsion to make the pressure plate float upward. Adjust the current intensity of the electromagnet until the suspension height of the pressure plate meets the requirement of placing the sample to be tested.

[0020] S3: Place four groups of samples to be tested on the upper surfaces of four heating blocks respectively;

[0021] S4: Gradually reduce the current intensity of the electromagnet to reduce the magnetic repulsion, so that the pressure plate slowly descends under the action of gravity. When the pressure plate descends to contact the upper surface of the sample to be tested and the pressure sensor displays the pressure value corresponding to the gravity of the pressure plate from 0 pressure, the main control box receives the pressure signal and sends a power connection instruction to the electromagnet to switch to "positive and negative positive connection". The magnetic repulsion of the electromagnet is converted into attraction. The pressure value of the pressure sensor rises to the specified pressure F, and the current intensity of the electromagnet is kept unchanged.

[0022] S5: Seal the isolation cover and place it on the carrier plate to form a closed test environment. If you choose to test in air, there is no need to vacuumize. If you choose to test in a vacuum environment, you need to vacuumize.

[0023] S6: The air valve on the pipeline column is connected to the compressor for vacuuming. After the air is extracted, the negative pressure value in the air valve is uploaded to the main control box. The main control box sends a "close" command to the air valve to automatically close the pressure relief switch to enter the vacuum pressure maintenance stage;

[0024] S7: The graphene heating film in the heating block is powered on and heated, and all the temperature detection points on the heating block rise evenly and slowly from the ambient temperature. When the temperature of each temperature detection point reaches a steady state, the master control box performs a temperature algorithm analysis on the temperature of each temperature detection point.

[0025] S8: The temperature algorithm analysis process in the master control box is as follows: the data differences of the four test groups in the thickness direction are compared {(Tb0-Ta0), (Tb1-Ta1), (Tb2-Ta2)}, and the data differences in the thickness direction are ranked as excellent, inferior, medium, and poor according to the comparison rule that "the smaller the thickness direction error, the better the thermal conductivity, and the larger the temperature difference, the worse the thermal conductivity"; the data differences in the two plane directions of the pressure plate and the heating block are compared {(Ta0-Ta1), (Ta0-Ta2)} and {(Tb0-Tb1), (Tb0-Tb2)}, and the difference results in the two plane directions are ranked as excellent, inferior, medium, and poor according to the comparison rule that "the smaller the temperature difference of the temperature probe point in the horizontal direction, the better the thermal conductivity in the horizontal direction, and the larger the temperature difference, the worse the thermal conductivity in the horizontal direction"; the four test groups are compared with each other in terms of temperature rise {(Ta0-T) ,(Ta1-T),(Ta2-T),(Tb0-T),(Tb1-T),(Ta2-T)}, the corresponding temperature rise difference results are arranged into four levels of excellent, inferior, medium and poor according to "the temperature difference between the temperature probe point on the sample to be tested and the temperature probe point of the environment is the temperature rise of the surface of the sample to be tested, the greater the temperature rise, the better the thermal conductivity, the smaller the temperature rise, the poorer the thermal conductivity, and the inconsistent temperature rises of the two temperature probe points stacked in the center of the surface of the sample to be tested indicate that the material of the sample to be tested is unevenly mixed and the thermal conductivity coefficients at different positions are inconsistent". Finally, the thickness direction, horizontal surface, and temperature rise comparison level are sorted and the final test comparison results are output. The final excellent, inferior, medium and poor four level signals are respectively transmitted to the color-changing indicator lights of the corresponding test groups, and the color-changing indicator lights emit "green, blue, yellow and red" lights respectively; the master control box will set the input parameters, thermal conductivity temperature, temperature difference, temperature rise detailed data and curves to be displayed on the display screen or exported as a test basis;

[0026] S9: The main control box sends a "pressure relief" command to the air valve, and the pressure relief switch of the air valve opens 1 / 4, allowing the air component to enter the test environment. When the vacuum negative pressure value in the test environment returns to 0, the isolation cover is opened;

[0027] S10: Gradually reduce the current of the electromagnet to reduce the attractive force. When the pressure sensor drops from pressure F to the pressure corresponding to the weight of the pressure plate, the master control box receives the pressure signal and sends a power connection instruction to the electromagnet to switch to "positive and negative polarity reverse connection". The attractive force of the electromagnet is converted into repulsive force, and the pressure plate is magnetically suspended on the guide column.

[0028] S11: Take out the sample to be tested and archive it;

[0029] S12: resetting the pressing plate to the surface of the heating block;

[0030] S13: The test is completed and the main control box is powered off.

[0031] The present invention provides a device and method for testing energy storage thermal conductive structural adhesive. The device uses a supporting plate on a pipeline column and multiple test groups located on the supporting plate. Each test group includes a master control box, a pressure sensing component, a heating component and a guide component. The pressure sensing component can perform intelligent pressure control on the sample to be tested to eliminate thermal conductivity deviation under different pressures. The heating component uses a graphene heating film to achieve automatic frequency modulation function to ensure uniform and constant heating temperature. The guide component includes a pressure plate located above the heating component, a guide column, an electromagnet and a strong magnet. It can perform axial and planar thermal conductivity tests on the sample to be tested, and also realizes simultaneous multi-station testing, ensuring the accuracy of comparative tests under the same working conditions, and improving the test accuracy and working stability of the thermal conductivity of the sample to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A front view of the energy storage thermal conductive structural adhesive testing device provided by the present invention;

[0034] Figure 2 A top view of the energy storage thermal conductive structural adhesive testing device provided by the present invention;

[0035] Figure 3 An enlarged front view of the test group provided by the present invention;

[0036] Figure 4 An enlarged top view of the test group provided by the present invention;

[0037] Figure 5 This is a flow chart of the method for testing the energy storage thermal conductive structural adhesive provided by the present invention.

[0038] The main component symbols are described as follows:

[0039] 10-Pipeline column; 11-Loading plate; 12-Test group; 13-Master control box; 14-Pressure plate; 15-Guide column; 16-Electromagnet; 17-Strong magnet; 18-Sample to be tested; 19-Telescopic motor; 20-Linear bearing; 21-Telescopic sealing ring; 22-Base plate; 23-Pressure sensor; 24-Thermal insulation layer; 25-Base; 26-Heating block; 27-Temperature detection point; 28-Wire trough; 29-Isolation cover; 30-U-shaped sealing strip; 31-Air valve; 32-Color-changing indicator light. DETAILED DESCRIPTION

[0040] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0042] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] See Figure 1-Figure 5 The present invention provides a device for testing an energy storage thermal conductive structural adhesive, the device comprising a pipeline column 10, a supporting plate 11 disposed on the pipeline column 10, and a plurality of test groups 12 located on the supporting plate 11;

[0044] The test group 12 includes a master control box 13, a pressure sensing component, a heating component, and a guide component. The master control box 13 is arranged on the lower surface of the carrier plate 11 and is electrically connected to the pressure sensing component located on the upper surface of the carrier plate 11. The heating component is arranged on the pressure sensing component. The guide component includes a pressure plate 14 located above the heating component, a guide column 15 vertically connected to the pressure plate 14, and an electromagnet 16 arranged on the carrier plate 11. The electromagnet 16 is located between the pressure sensing component and the guide column 15. A strong magnet 17 corresponding to the electromagnet 16 is embedded in the pressure plate 14, and the electromagnet 16 is electrically connected to the master control box 13.

[0045] The master control box 13 receives the pressure value of the pressure sensing component and sends a power-on connection instruction to the electromagnet 16. The electromagnet 16 generates a force with the strong magnet 17 according to the power-on connection instruction to form a thermal conductive test space for placing the sample to be tested 18 between the pressure plate 14 and the heating component, wherein the power-on connection instruction includes the positive and negative pole connection method of the electromagnet 16 and the current intensity.

[0046] In this embodiment, Figure 3 As shown, the test group 12 also includes a telescopic assembly, which includes a telescopic motor 19 electrically connected to the master control box 13, a linear bearing 20 passing through the carrier plate 11, and a telescopic sealing ring 21. One end of the linear bearing 20 is assembled with the telescopic rod of the telescopic motor 19, and the other end of the linear bearing 20 is sleeved in the telescopic sealing ring 21. The lower end of the telescopic sealing ring 21 is fixed to the upper surface of the carrier plate 11. The pressure sensing assembly includes a base plate 22 arranged at the upper end of the telescopic sealing ring 21, a pressure sensor 23 located on the upper surface of the base plate 22, and a heat insulation layer 24 arranged on the pressure sensor 23. The heating assembly includes a base 25 arranged on the pressure sensor 23 and a heating block 26 located on the base 25. The heat insulation layer 24 is installed between the base 25 and the pressure sensor 23. The heating block 26 is provided with a graphene heating film bonded to the thermal insulation layer 24 and a plurality of evenly distributed temperature detection points 27. The heating surface of the graphene heating film is bonded to the base 25. The plurality of temperature detection points 27 are electrically connected to the master control box 13 through the wire grooves 28 provided diagonally on the upper surface of the heating block 26. The testing device also includes an isolation cover 29 which is sleeved on the plurality of test groups 12. The plurality of test groups 12 are arranged in parallel in pairs. The isolation cover 29 is used to isolate and insulate each of the test groups 12 from the external environment. An air valve 31 is provided at the bottom of one side of the pipe column 10. The pressure relief switch of the air valve 31 is electrically connected to the master control box 13. The sample 18 to be tested includes at least one of thermal conductive structural adhesive, aluminum alloy, copper alloy, plastic pad or thermal insulation sheet. The testing device also includes a color-changing indicator light arranged on the carrier plate 11 and corresponding to each of the test groups 12. The color-changing indicator light 32 is electrically connected to the main control box 13. The main control box 13 includes data acquisition function, data processing function, communication function, input and output control function, display function and alarm function.

[0047] It should be noted that if Figure 2As shown, the isolation cover 29 is made of heat-resistant, pressure-resistant and heat-insulating materials. The overall design is square. The bottom of the isolation cover 29 is open, and the opening is wrapped with a U-shaped sealing strip 30. There are two detachable "cross" clamping plates inside the isolation cover 29, which divide the interior of the isolation cover 29 into four equal parts. The edges of the clamping plates are also wrapped with U-shaped sealing strips 30. When the clamping plates contact the panel of the isolation cover 29, a sealing effect is formed. The U-shaped sealing strip 30 on the "tian" character edge at the bottom of the isolation cover 29 is tightly fitted with the "tian" character sunk groove on the bearing plate 11, so that the internal space of the isolation cover 29 is completely isolated and heat-insulated from the external environment. The bearing plate 11 is made of high-strength heat-insulating materials, has good machining characteristics and heat-insulating effects. Thirty-two blind holes and twelve through holes are machined on the upper surface of the bearing plate 11. The guide posts 15 and the support posts (electromagnets 17) are inserted into the blind holes by interference fit. Four pipeline columns 10 are assembled onto four through holes on the bearing plate 11 by interference fit. The remaining through holes are used for the wires of the heating block 26, the temperature probe wires to pass through and the linear bearings 20 to be installed. A "tian" character sunk groove is milled around the upper surface of the bearing plate 11, and a threaded blind hole is reserved on one side for fixing the master control box 13. The pipeline column 10 is made of alloy steel, with air hole blind holes machined in the middle. The blind hole ends are assembled with the through holes on the bearing plate 11 by interference fit, mainly playing the role of supporting the bearing plate 11. An air valve 31 is installed at the bottom of the blind hole in the pipeline column 10. The air valve 31 has a pressure relief switch and can relieve pressure and maintain pressure at any time. It can be connected to a general external air extraction pipeline to evacuate the space inside the isolation cover 29. Air can be inhaled through the pressure relief switch to make the internal vacuum negative pressure. The pressure of the vacuum extraction can be controlled by the communication of the master control box 13 to open and close the vacuum valve. When the internal vacuum negative pressure value of the isolation cover 29 is displayed on the display screen in real time.

[0048] Specifically, in the above telescopic assembly, the telescopic speed of the telescopic motor 19 is frequency adjustable, the telescopic size range is adjustable, and the minimum telescopic size can reach 0.05 mm with high-precision control each time. It can communicate with the master control box 13, and the parameters can be set through the screen on the master control box 13. There are a total of four telescopic motors 19, and one telescopic motor 19 is set for each test group 12. The four telescopic motors 19 are electrically connected in series to ensure that the current of the four telescopic motors 19 is the same. The current of any one telescopic motor 19 can also be adjusted through the adjustment switch. The telescopic motor 19 is installed at the bottom of the bearing plate 11 by bolts. The telescopic rod of the telescopic motor 19 is assembled with the linear bearing 20 and can freely telescopic without resistance. The inner hole of the linear bearing 20 is assembled with the telescopic rod of the telescopic motor 19. The linear bearing 20 has a structure that can withstand atmospheric pressure without deformation in the radial direction. The upper end of the telescopic sealing ring 21 is fixed on the bottom plate 22 with strong glue, and the lower end of the telescopic sealing ring 21 is fixed on the upper surface of the bearing plate 11.

[0049] Specifically, in the above-mentioned pressure sensing component, the base plate 22 is made of high-strength heat-insulating material, is installed horizontally, and is installed together with the telescopic rod of the telescopic motor 19 through countersunk holes and countersunk bolts. It moves up and down with the telescopic rod, and the upper surface of the base plate 22 is fastened to the pressure sensor 23 through countersunk bolts. The pressure sensor 23 is a cylinder with the characteristics of large range and high precision. Small threaded holes are reserved for installation on both sides of the pressure sensor 23, and both sides can be fastened and installed by small bolts. The pressure sensor 23 can collect pressure in real time and convert the collected pressure data into electrical signals, and transmit the pressure signals through its own pressure transmission signal line. The pressure sensor 23 can communicate with the main control box 13, and the pressure parameters can be set and displayed on the screen of the main control box 13. The thermal insulation layer 24 is made of a non-soft material with very low thermal conductivity, and there is no loss in force transmission and the thermal insulation effect is good. The thermal insulation layer 24 is installed between the base 25 and the pressure sensor 23. The base 25 and the pressure sensor 23 are fastened by nylon bolts with poor thermal conductivity to squeeze the thermal insulation layer 24 in the middle.

[0050] Specifically, in the above-mentioned heating assembly, the base 25 is made of high-strength thermal insulation material, and a sunken square groove is machined inside. The size of the square groove is greater than 0.2mm in accordance with the outer dimensions of the heating block, and the depth is 0.5mm lower than the thickness of the heating block. The bottom of the base 25 is fastened to the pressure sensor 23, and a threaded through hole is reserved at the bottom of the sunken square groove, which is fastened to the threaded hole on the heating block 26. The heating block 26 is made of copper, and a sunken groove is machined on its lower surface, and a threaded hole is machined on the edge of the sunken groove. A graphene heating film is pasted inside the sunken groove, and the heating surface of the graphene heating film is glued to the bottom of the copper square groove by thermally conductive adhesive. The extrusion force comes from the bolts fastened between the base 25 and the copper screw hole. A tiny groove is machined diagonally on the upper surface of the heating block 26 for routing the temperature probe. The temperature probe is connected through the wiring in the wire groove 28 and fixed and filled with high-temperature resistant thermal conductive adhesive. The upper surface of the heating block 26 is ground to a flatness of less than ±0.05mm; three temperature probes are evenly distributed in the groove on the upper surface of the heating block 26, and the surface of the temperature detection point 27 has a negative tolerance of 0.1mm with the upper surface of the heating block 26. It is filled with high-temperature resistant thermal conductive adhesive and hardened, and then ground flat again.

[0051] Specifically, if Figure 3 and Figure 4As shown, in the above-mentioned guide assembly, the pressure plate 14 is made of high-strength heat-insulating material, resistant to high temperature and high pressure without deformation, and the overall shape of the pressure plate 14 is an inverted "convex" character with a round outer circle and a square inner circle. The size of the square boss is consistent with the size of the heating block, and the surface of the square boss has the same processing accuracy and structure as the upper surface of the heating block 26, that is, the temperature detection point 27 on the square boss corresponds one by one to the temperature probe on the heating block 26. (Circular) Four through holes are machined on the surface of the pressure plate 14 and are assembled through the guide column 15. There is a gap of 0.2mm between each through hole and the guide column 15. Four circular blind holes are machined under the pressure plate 14 and are interference fit with the strong magnet 17. The pressure plate 14 automatically moves up and down along the guide column 15 under the attraction of the strong magnet 17. When the telescopic rod of the telescopic motor 19 is extended upward, the distance between the strong magnet 17 on the pressure plate 14 and the electromagnet 16 becomes farther. The sample to be tested 18 is preferably a thermally conductive structural adhesive test sample, and the pressure plate 14 is applied to the thermally conductive structural adhesive. The pressure on the test sample decreases; when the telescopic motor 19 contracts downward, the distance between the strong magnet 17 on the pressure plate 14 and the electromagnet 16 becomes closer, and the pressure applied by the pressure plate 14 to the thermal conductive structural adhesive test sample increases; when the test is completed, the electromagnet 16 switches the electrodes through the main control box 13, causing the electromagnet 16 and the strong magnet 17 to generate repulsive forces (magnetic repulsion) in opposite directions. At this time, the pressure plate 14 is magnetically suspended on the guide column 15 under the action of the repulsive force, and the pressure sensor 23 displays zero pressure. At this time, the thermal conductive structural adhesive test sample can be removed. The guide column 15 is made of alloy steel and is processed into a cylindrical shape with a smooth surface. The lower end of the guide column 15 is tightly fitted with the blind hole of the support plate 11, and the perpendicularity to the surface of the support plate 11 is less than 0.05mm. The electromagnet 16 is a cylindrical body that generates strong magnetism through electric current. The direction of the magnetism can be changed by switching the positive and negative poles of the power supply (connection method), that is, the positive direction of the positive and negative poles is magnetic attraction, and the positive and negative directions are magnetic repulsion. The magnitude of the magnetic force (force) can also be controlled by adjusting the magnitude of the input current (current intensity); the outer packaging of the electromagnet 16 is insulating material, and its bottom is interference fit with the blind hole reserved in the carrier plate 11, and the perpendicularity with the surface of the carrier plate 11 is less than 0.05mm. The installation position of the electromagnet 11 corresponds perpendicularly to the strong magnet 17 to ensure the perpendicularity of the magnetic direction.

[0052] Among them, the electromagnet 16 is electrically connected to the main control box 13, and the magnetic force and on / off of the electromagnet 16 are set through the screen (touch screen) of the main control box 13. When the telescopic motor 19 fails or can directly replace the telescopic motor 19 to control the magnetic attraction by adjusting the telescopic distance, it is only necessary to control the pressure by adjusting the input current of the electromagnet 16 alone; when the test is completed, when the input power of the electromagnet 16 switches the positive and negative poles to generate a repulsive force, the pressure plate 14 can be directly pushed upward (away from the base) by the repulsive force, so that the pressure plate 14 is suspended on the guide column 15. The pressure of the pressure sensor 23 is displayed as zero. At this time, the thermal conductive structural adhesive test sample can be removed. The electromagnets 16 are distributed in equal parts around the carrier plate 11. Each individual test group has four electromagnets 16, so that the upward repulsive force and downward attractive force on the pressure plate 14 are uniform. The pressure plate 14 will not tilt or get stuck due to uneven force during movement.

[0053] The strong magnet 17 is cylindrical, with a diameter consistent with that of the electromagnet 16. Its permanent magnetism persists despite frequent use. The strong magnet 17 is embedded in a blind hole reserved in the pressure plate 14, its position coinciding with the vertical projection of the electromagnet 16. The strong magnets 17 are evenly distributed around the pressure plate 14, with each test group 12 containing four electromagnets 16. These magnets interact with the strong magnets, ensuring a uniform upward repulsive force and downward attractive force on the pressure plate 14. This prevents the pressure plate 14 from tilting or becoming stuck due to uneven force during movement.

[0054] Specifically, the above-mentioned sample 18 to be tested can be a thermal conductive structural adhesive test sample, which uses a solidification mold to make the fluid thermal conductive structural adhesive into a standard square solid. The size is consistent with the shape of the heating block, and the thickness is determined according to the test requirements. The thickness of the thermal conductive structural adhesive designed for the general liquid cooling module has different sizes such as 0.5mm, 0.8mm, 1mm, and 1.2mm. By making thermal conductive structural adhesives of different thicknesses and conducting comparative tests, we can understand the degree of influence of thickness on the heat dissipation performance of the thermal conductive structural adhesive. We can also select different brands of thermal conductive structural adhesives for comparative tests at the same time to screen the brand of the best thermal conductive structural adhesive. The specific thermal conductivity is determined by two aspects of temperature data: (1) Under the control variable test method, three groups of temperature probe points 27 are used to collect surface temperature on the upper and lower surfaces of the thermal conductive structure test sample. The temperature difference of the temperature probe points 27 in the thickness direction can indicate the thermal conductivity of the thermal conductive structure adhesive in the thickness direction. Under the same other working conditions, the smaller the temperature difference in the upper and lower thickness directions, the better the thermal conductivity, and the larger the temperature difference, the worse the thermal conductivity; (2) The smaller the temperature difference of the temperature probe points 27 in the horizontal direction, the better the thermal conductivity in the horizontal direction, and the larger the temperature difference, the worse the thermal conductivity in the horizontal direction; the temperature difference between the temperature probe point 27 on the thermal conductive structure adhesive and the ambient temperature (environmental temperature) temperature probe point 27 is the surface temperature rise of the thermal conductive structure adhesive. The larger the temperature rise, the better the thermal conductivity, and the smaller the temperature rise, the worse the thermal conductivity. The temperature rise at the two symmetrical temperature probe points 27 on the surface of the thermal conductive structural adhesive is inconsistent, indicating that the material of the thermal conductive structural adhesive is not evenly mixed and the thermal conductivity coefficients at different positions are inconsistent. The sample 18 to be tested is not limited to thermal conductive structural adhesives, and different materials can also be tested and compared, such as aluminum alloy, copper alloy, plastic pads, thermal insulation sheets, etc. for comparative testing of heat dissipation effects.

[0055] The master control box 13 serves as the control center of the device, primarily encompassing data acquisition, data processing, communication, input / output control, display, and alarm functions. The data acquisition function collects data such as the pressure sensor, temperature probe, electromagnet current, heating block power, and vacuum pressure, and stores this data for subsequent historical review. This data is then communicated to the data processing module, which automatically calculates the temperature of the temperature probe according to an imported algorithm, intuitively deriving comparative results of the heat dissipation performance of the tested thermally conductive adhesive structure samples. Four comparative test groups are graded as excellent, poor, fair, and poor, with green, blue, yellow, and red lights illuminated next to each test group, respectively. Among them, the color-changing indicator light 32 is electrically connected to the main control box 13, and the color-changing indicator light 32 is driven by the data analysis and judgment result of the main control box 13. When the thermal conductivity performance of the thermal conductive structural adhesive comparative test is "excellent", it becomes a green indicator light; when the thermal conductivity performance of the thermal conductive structural adhesive comparative test is "substandard", it becomes a blue indicator light; when the thermal conductivity performance of the thermal conductive structural adhesive comparative test is "medium", it becomes a yellow indicator light; when the thermal conductivity performance of the thermal conductive structural adhesive comparative test is "poor", it becomes a red indicator light.

[0056] See Figure 5 The present invention also provides a method for testing an energy storage thermal conductive structural adhesive, which is applied to the above-mentioned energy storage thermal conductive structural adhesive testing device and includes the following steps:

[0057] S1: The main control box is powered on, and the display on the main control box lights up to display the status of each data collection. If the display status is normal, proceed to the next step; if the display status is abnormal, debug and check until it is normal before proceeding to the next step, wherein the power P of the heating block, the pressure F of the pressure sensor, the telescopic size L of the telescopic motor and the current I of the electromagnet are preset, as well as the temperature Ta0 collected by the middle temperature probe point on the pressure plate, the temperature Ta2 collected by the left temperature probe point at the diagonal position, and the temperature Ta3 collected by the right temperature probe point at the diagonal position, the temperature Tb0 collected by the middle temperature probe point on the heating block, the temperature Tb1 collected by the left temperature probe point at the diagonal position, and the temperature T collected by the environment temperature probe point inside the isolation cover;

[0058] S2: Control the positive and negative poles of the four electromagnets to be connected in reverse, and generate magnetic repulsion to make the pressure plate float upward. Adjust the current intensity of the electromagnet until the suspension height of the pressure plate meets the requirement of placing the sample to be tested.

[0059] S3: Place four groups of samples to be tested on the upper surfaces of four heating blocks respectively;

[0060] S4: Gradually reduce the current intensity of the electromagnet to reduce the magnetic repulsion, so that the pressure plate slowly descends under the action of gravity. When the pressure plate descends to contact the upper surface of the sample to be tested and the pressure sensor displays the pressure value corresponding to the gravity of the pressure plate from 0 pressure, the main control box receives the pressure signal and sends a power connection instruction to the electromagnet to switch to "positive and negative positive connection". The magnetic repulsion of the electromagnet is converted into attraction. The pressure value of the pressure sensor rises to the specified pressure F, and the current intensity of the electromagnet is kept unchanged.

[0061] S5: Seal the isolation cover and place it on the carrier plate to form a closed test environment. If you choose to test in air, there is no need to vacuumize. If you choose to test in a vacuum environment, you need to vacuumize.

[0062] S6: The air valve on the pipeline column is connected to the compressor for vacuuming. After the air is extracted, the negative pressure value in the air valve is uploaded to the main control box. The main control box sends a "close" command to the air valve to automatically close the pressure relief switch to enter the vacuum pressure maintenance stage;

[0063] S7: The graphene heating film in the heating block is powered on and heated, and all the temperature detection points on the heating block rise evenly and slowly from the ambient temperature. When the temperature of each temperature detection point reaches a steady state, the master control box performs a temperature algorithm analysis on the temperature of each temperature detection point.

[0064] S8: The temperature algorithm analysis process in the master control box is as follows: the data differences of the four test groups in the thickness direction are compared {(Tb0-Ta0), (Tb1-Ta1), (Tb2-Ta2)}, and the data differences in the thickness direction are ranked as excellent, inferior, medium, and poor according to the comparison rule that "the smaller the thickness direction error, the better the thermal conductivity, and the larger the temperature difference, the worse the thermal conductivity"; the data differences in the two plane directions of the pressure plate and the heating block are compared {(Ta0-Ta1), (Ta0-Ta2)} and {(Tb0-Tb1), (Tb0-Tb2)}, and the difference results in the two plane directions are ranked as excellent, inferior, medium, and poor according to the comparison rule that "the smaller the temperature difference of the temperature probe point in the horizontal direction, the better the thermal conductivity in the horizontal direction, and the larger the temperature difference, the worse the thermal conductivity in the horizontal direction"; the four test groups are compared with each other in terms of temperature rise {(Ta0-T) ,(Ta1-T),(Ta2-T),(Tb0-T),(Tb1-T),(Ta2-T)}, the corresponding temperature rise difference results are arranged into four levels of excellent, inferior, medium and poor according to "the temperature difference between the temperature probe point on the sample to be tested and the temperature probe point of the environment is the temperature rise of the surface of the sample to be tested, the greater the temperature rise, the better the thermal conductivity, the smaller the temperature rise, the poorer the thermal conductivity, and the inconsistent temperature rises of the two temperature probe points stacked in the center of the surface of the sample to be tested indicate that the material of the sample to be tested is unevenly mixed and the thermal conductivity coefficients at different positions are inconsistent". Finally, the thickness direction, horizontal surface, and temperature rise comparison level are sorted and the final test comparison results are output. The final excellent, inferior, medium and poor four level signals are respectively transmitted to the color-changing indicator lights of the corresponding test groups, and the color-changing indicator lights emit "green, blue, yellow and red" lights respectively; the master control box will set the input parameters, thermal conductivity temperature, temperature difference, temperature rise detailed data and curves to be displayed on the display screen or exported as a test basis;

[0065] S9: The main control box sends a "pressure relief" command to the air valve, and the pressure relief switch of the air valve opens 1 / 4, allowing the air component to enter the test environment. When the vacuum negative pressure value in the test environment returns to 0, the isolation cover is opened;

[0066] S10: Gradually reduce the current of the electromagnet to reduce the attractive force. When the pressure sensor drops from pressure F to the pressure corresponding to the weight of the pressure plate, the master control box receives the pressure signal and sends a power connection instruction to the electromagnet to switch to "positive and negative polarity reverse connection". The attractive force of the electromagnet is converted into repulsive force, and the pressure plate is magnetically suspended on the guide column.

[0067] S11: Take out the sample to be tested and archive it;

[0068] S12: resetting the pressing plate to the surface of the heating block;

[0069] S13: The test is completed and the main control box is powered off.

[0070] In this embodiment, a supporting plate on a pipe column and multiple test groups located on the supporting plate are provided. Each test group includes a master control box, a pressure sensing component, a heating component and a guide component. The pressure sensing component can perform intelligent pressure control on the sample to be tested to eliminate the deviation of thermal conductivity under different pressures. The heating component adopts a graphene heating film to realize the automatic frequency modulation function to make the heating temperature uniform and constant. The guide component includes a pressure plate, a guide column, an electromagnet and a strong magnet located above the heating component. It can perform axial and planar thermal conductivity tests on the sample to be tested, and also realizes simultaneous multi-station testing to ensure The accuracy of comparative tests under the same working conditions is ensured; the isolation cover is used for sealing and environmental isolation, so that the workstations can be isolated separately or mixed; the air valve on the pipeline column allows the workstations to freely choose air test environment or vacuum test environment; multiple temperature detection points are electrically connected to the main control box through the wire groove set in the diagonal direction of the upper surface of the heating block, which can automatically analyze and determine the test parameters of the thermal performance of the sample to be tested and output the data analysis curve. The combination of electromagnet and strong magnet and telescopic motor can realize intelligent control of test pressure, which improves the test accuracy and working stability of the thermal conductivity of the sample to be tested to a certain extent.

[0071] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0072] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0073] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that variations and modifications are possible without departing from the scope of the present invention, and such variations and modifications are fully within the scope of protection of the present invention.

Claims

1. A testing device for energy storage thermal conductive structural adhesive, characterized in that: The testing device includes a pipeline column, a bearing plate arranged on the pipeline column, and a plurality of testing groups located on the bearing plate; The test group includes a master control box, a pressure sensing component, a heating component, and a guide component. The master control box is arranged on the lower surface of the carrier plate and is electrically connected to the pressure sensing component located on the upper surface of the carrier plate. The heating component is arranged on the pressure sensing component. The guide component includes a pressure plate located above the heating component, a guide column vertically connected to the pressure plate, and an electromagnet arranged on the carrier plate. The electromagnet is located between the pressure sensing component and the guide column. A strong magnet corresponding to the electromagnet is embedded in the pressure plate, and the electromagnet is electrically connected to the master control box. The master control box receives the pressure value of the pressure sensing component and sends a power-on connection instruction to the electromagnet. The electromagnet generates a force with the strong magnet according to the power-on connection instruction to form a thermal conductive test space for placing the sample to be tested between the pressure plate and the heating component, wherein the power-on connection instruction includes the positive and negative pole connection method of the electromagnet and the current intensity.

2. The energy storage thermal conductive structural adhesive testing device according to claim 1, characterized in that: The test group also includes a telescopic component, which includes a telescopic motor electrically connected to the master control box, a linear bearing and a telescopic sealing ring passing through the supporting plate, one end of the linear bearing is assembled with the telescopic rod of the telescopic motor, and the other end of the linear bearing is sleeved in the telescopic sealing ring, and the lower end of the telescopic sealing ring is fixed to the upper surface of the supporting plate.

3. The energy storage thermal conductive structural adhesive testing device according to claim 2, characterized in that: The pressure sensing component includes a bottom plate arranged at the upper end of the telescopic sealing ring, a pressure sensor located on the upper surface of the bottom plate, and a heat insulation layer arranged on the pressure sensor.

4. The energy storage thermal conductive structural adhesive testing device according to claim 3, characterized in that: The heating assembly includes a base arranged on the pressure sensor and a heating block located on the base, and the heat insulation layer is installed between the base and the pressure sensor.

5. The energy storage thermal conductive structural adhesive testing device according to claim 4, characterized in that: The heating block is provided with a graphene heating film bonded to the thermal insulation layer and a plurality of evenly distributed temperature detection points. The heating surface of the graphene heating film is bonded to the base, and the plurality of temperature detection points are electrically connected to the master control box through wire grooves provided in a diagonal direction on the upper surface of the heating block.

6. The energy storage thermal conductive structural adhesive testing device according to claim 1, characterized in that: The testing device further comprises an isolation cover sleeved on the plurality of test groups, wherein the plurality of test groups are arranged in parallel in pairs, and the isolation cover is used to isolate and heat-insulate each of the test groups from the external environment.

7. The energy storage thermal conductive structural adhesive testing device according to claim 6, characterized in that: An air valve is provided at the bottom of one side of the pipeline column, and a pressure relief switch of the air valve is electrically connected to the master control box.

8. The energy storage thermal conductive structural adhesive testing device according to claim 1, characterized in that: The sample to be tested includes at least one of thermal conductive structural adhesive, aluminum alloy, copper alloy, plastic pad or thermal insulation sheet.

9. The energy storage thermal conductive structural adhesive testing device according to claim 1, characterized in that: The testing device also includes a color-changing indicator light arranged on the carrier plate and corresponding to each of the test groups. The color-changing indicator light is electrically connected to the main control box. The main control box includes data acquisition function, data processing function, communication function, input and output control function, display function and alarm function.

10. A method for testing energy storage thermal conductive structural adhesive, characterized in that: The energy storage thermal conductive structural adhesive testing device according to any one of claims 1 to 9 comprises the following steps: S1: The main control box is powered on, and the display on the main control box lights up to display the status of each data collection. If the display status is normal, proceed to the next step; if the display status is abnormal, debug and check until it is normal before proceeding to the next step, wherein the power P of the heating block, the pressure F of the pressure sensor, the telescopic size L of the telescopic motor and the current I of the electromagnet are preset, as well as the temperature Ta0 collected by the middle temperature probe point on the pressure plate, the temperature Ta2 collected by the left temperature probe point at the diagonal position, and the temperature Ta3 collected by the right temperature probe point at the diagonal position, the temperature Tb0 collected by the middle temperature probe point on the heating block, the temperature Tb1 collected by the left temperature probe point at the diagonal position, and the temperature T collected by the environment temperature probe point inside the isolation cover; S2: Control the positive and negative poles of the four electromagnets to be connected in reverse, and generate magnetic repulsion to make the pressure plate float upward. Adjust the current intensity of the electromagnet until the suspension height of the pressure plate meets the requirement of placing the sample to be tested. S3: Place four groups of samples to be tested on the upper surfaces of four heating blocks respectively; S4: Gradually reduce the current intensity of the electromagnet to reduce the magnetic repulsion, causing the pressure plate to slowly descend under the action of gravity. When the pressure plate descends to contact the upper surface of the sample to be tested and the pressure sensor displays the pressure value corresponding to the pressure plate gravity from 0 pressure, the main control box receives the pressure signal and sends a power connection instruction to the electromagnet to switch to "positive and negative positive connection". The magnetic repulsion of the electromagnet is converted into attraction. The pressure value of the pressure sensor rises to the specified pressure F, and the current intensity of the electromagnet is kept unchanged. S5: Seal the isolation cover and place it on the carrier plate to form a closed test environment. If you choose to test in air, there is no need to vacuumize. If you choose to test in a vacuum environment, you need to vacuumize. S6: The air valve on the pipeline column is connected to the compressor for vacuuming. After the air is extracted, the negative pressure value in the air valve is uploaded to the main control box. The main control box sends a "close" command to the air valve to automatically close the pressure relief switch to enter the vacuum pressure maintenance stage; S7: The graphene heating film in the heating block is powered on and heated, and all the temperature detection points on the heating block rise evenly and slowly from the ambient temperature. When the temperature of each temperature detection point reaches a steady state, the master control box performs a temperature algorithm analysis on the temperature of each temperature detection point. S8: The temperature algorithm analysis process in the master control box is as follows: the data difference values of the four test groups in the thickness direction are compared {(Tb0-Ta0), (Tb1-Ta1), (Tb2-Ta2)}, and the data difference values in the thickness direction are ranked as excellent, inferior, medium, and poor according to the comparison rule that "the smaller the thickness direction error, the better the thermal conductivity, and the larger the temperature difference, the worse the thermal conductivity"; the data difference values in the two plane directions of the pressure plate and the heating block are compared {(Ta0-Ta1), (Ta0-Ta2)} and {(Tb0-Tb1), (Tb0-Tb2)}, and the difference results in the two plane directions are ranked as excellent, inferior, medium, and poor according to the comparison rule that "the smaller the temperature difference of the temperature probe point in the horizontal direction, the better the thermal conductivity in the horizontal direction, and the larger the temperature difference, the worse the thermal conductivity in the horizontal direction"; the four test groups are compared with each other in terms of temperature rise {(Ta0-T) ,(Ta1-T),(Ta2-T),(Tb0-T),(Tb1-T),(Ta2-T)}, the corresponding temperature rise difference results are arranged into four levels of excellent, inferior, medium and poor according to "the temperature difference between the temperature probe point on the sample to be tested and the temperature probe point of the environment is the temperature rise of the surface of the sample to be tested, the greater the temperature rise, the better the thermal conductivity, the smaller the temperature rise, the poorer the thermal conductivity, and the inconsistent temperature rises of the two temperature probe points stacked in the center of the surface of the sample to be tested indicate that the material mixing of the sample to be tested is uneven and the thermal conductivity coefficients at different positions are inconsistent". Finally, the thickness direction, horizontal surface, and temperature rise comparison level are sorted and the final test comparison results are output. The final excellent, inferior, medium and poor four level signals are respectively transmitted to the color-changing indicator lights of the corresponding test groups, and the color-changing indicator lights emit "green, blue, yellow and red" lights respectively; the master control box will set the input parameters, thermal conductivity temperature, temperature difference, temperature rise detailed data and curves to be displayed on the display screen or exported as a test basis; S9: The main control box sends a "pressure relief" command to the air valve, and the pressure relief switch of the air valve opens 1 / 4, allowing the air component to enter the test environment. When the vacuum negative pressure value in the test environment returns to 0, the isolation cover is opened; S10: Gradually reduce the current of the electromagnet to reduce the attractive force. When the pressure sensor drops from pressure F to the pressure corresponding to the weight of the pressure plate, the master control box receives the pressure signal and sends a power connection instruction to the electromagnet to switch to "positive and negative reverse connection". The attractive force of the electromagnet is converted into a repulsive force, and the pressure plate is magnetically suspended on the guide column. S11: Take out the sample to be tested and archive it; S12: resetting the pressing plate to the surface of the heating block; S13: The test is completed and the main control box is powered off.

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