Testing device

Abstract

The invention provides a testing device. The testing device comprises a box body, a clamping assembly, a voltage module and an electric connection structure. An accommodating cavity is defined in the box body; the accommodating cavity is used for accommodating electrolyte; the clamping assembly is used for clamping an electrode to be tested; the voltage module comprises a constant voltage source; one end of the electric connection structure is electrically connected with the constant voltage source, and the other end of the electric connection structure is located in the box body. Therefore, the constant voltage source can apply constant voltage to the electrode to be tested and the electrolyte, so that the environmental parameters in the battery cell can be simulated, the accuracy of the test result is improved, and the reliability of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a testing device. Background Technology

[0002] In lithium-ion batteries, adequate wetting of the electrodes by the electrolyte is a key factor in ensuring stable battery performance, high energy density, long cycle life, and even safe use. As the carrier of ion transport in the battery, the wettability of the electrolyte directly affects ion conduction efficiency. Poor electrolyte wetting can lead to lithium plating during charging, thereby shortening battery life and even affecting safety.

[0003] In related technologies, when testing the wettability of electrode sheets, the parameters of the environment in which the electrode sheets are located (such as voltage) are different from the parameters of the environment inside the battery cell. This can lead to inaccurate test results, which can easily result in misjudgments of the true performance of the battery cell manufactured based on the electrode sheets, thereby reducing the reliability of the battery cell. Summary of the Invention

[0004] This application provides a testing apparatus to address the problem of inaccurate wettability test results for electrode sheets.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] This application provides a testing device, which includes: a housing, a clamping assembly, a voltage module, and an electrical connection structure. The housing defines a receiving cavity for containing an electrolyte; the clamping assembly clamps the electrode under test; the voltage module includes a constant voltage source; one end of the electrical connection structure is electrically connected to the constant voltage source, and the other end of the electrical connection structure is located inside the housing.

[0007] In some possible implementations, the electrical connection structure includes a first terminal block located on the side wall of the enclosure and electrically connected to a constant voltage source.

[0008] In some possible implementations, the testing apparatus also includes a vacuum pump located outside the chamber and connected to the interior of the chamber.

[0009] In some possible implementations, the housing has a vacuum port, and a vacuum pump is connected to the vacuum port via a first pipeline; the testing device also includes a control valve, which is located at the vacuum port or in the first pipeline.

[0010] In some possible implementations, the testing apparatus further includes a heating module and a temperature control module; the heating module includes a temperature sensor and a heating element. The temperature sensor is used to detect the temperature of the electrolyte; the heating element is located inside the chamber for heating the electrolyte; the temperature control module is electrically connected to the temperature sensor and the heating element, and is configured to control the heating element to operate or stop operating based on the detection result of the temperature sensor.

[0011] In some possible implementations, the clamping assembly includes a slide rod and clamping components. The slide rod is vertically mounted on the inner peripheral wall of the housing; the clamping components include a first clamping member and a second clamping member, both of which are slidably connected to the slide rod in the vertical direction. The clamping components have a first state and a second state; in the first state, the first clamping member and the second clamping member move synchronously and cooperate to clamp the electrode to be tested; in the second state, the first clamping member and the second clamping member can move relative to each other in the vertical direction.

[0012] In some possible implementations, the testing device includes a scale, which is vertically mounted on the inner wall of the housing and located on one side of the clamping assembly.

[0013] In some possible implementations, the testing apparatus may also include a camera module for taking pictures of the clamping assembly and the ruler.

[0014] In some possible implementations, the testing device also includes a camera module for taking pictures of the clamping assembly; the housing is provided with a light-transmitting element to divide the receiving cavity into a first sub-cavity and a second sub-cavity; the first sub-cavity is used to contain electrolyte, and at least a portion of the camera module is located in the second sub-cavity.

[0015] In some possible implementations, the testing apparatus further includes: a temperature control module, a vacuum module, a camera module, and a control system; the temperature control module, vacuum module, camera module, and voltage module are all communicatively connected to the control system; the control system is configured to: control the temperature control module to adjust the temperature of the electrolyte; control the vacuum module to adjust the air pressure inside the chamber; control the voltage module to apply voltage to the electrolyte and the electrode under test; and control the camera module to take pictures of the clamping assembly.

[0016] In some possible implementations, the control system includes: a communication module, a storage module, an image processing module, a calculation module, and a plotting module. The communication module is used to communicate with the temperature control module, the vacuum module, the camera module, and the voltage module; the storage module is used to store images and / or videos captured by the camera module; the image processing module is used to process the images and / or videos stored in the storage module; the calculation module is used to calculate the wetting rate of the electrode under test; and the plotting module is used to generate a graph showing the relationship between the wetting time of the electrode under test and the wetting height of the electrolyte on the electrode.

[0017] In some possible implementations, the enclosure has an electrolyte inlet and an electrolyte outlet; both the electrolyte inlet and the electrolyte outlet are connected to the receiving cavity; along the height of the enclosure, the electrolyte inlet is higher than the electrolyte outlet.

[0018] The testing apparatus provided in this application has the following beneficial effects:

[0019] The testing apparatus provided in this application allows the constant voltage source to be electrically connected to the electrolyte inside the chamber via an electrical connection structure. In this way, the constant voltage source can apply a constant voltage to the electrode under test and the electrolyte, thereby simulating the environmental parameters inside the battery cell, improving the accuracy of the test results, and thus helping to improve the reliability of the battery cell. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the testing apparatus provided in some embodiments of this application;

[0021] Figure 2 for Figure 1 A schematic diagram of the test device after the cover is removed;

[0022] Figure 3 for Figure 2 A schematic diagram of the test device shown from another perspective;

[0023] Figure 4 for Figure 2 Top view of the test apparatus shown;

[0024] Figure 5 A schematic diagram of the heating module and temperature control module of the testing apparatus provided in some embodiments of this application;

[0025] Figure 6 for Figure 2 A schematic diagram of the clamping assembly of the test device shown;

[0026] Figure 7 A block diagram of the control system of the test apparatus provided in some embodiments of this application;

[0027] Figure 8 This is a graph showing the relationship between the immersion time of the electrode under test and the immersion height of the electrolyte on the electrode under test under different applied voltage conditions in some embodiments of this application.

[0028] Figure 9 This is a graph showing the relationship between the immersion time of the electrode under test and the immersion height of the electrolyte on the electrode under test under different applied pressure conditions in some embodiments of this application.

[0029] Figure 10This is a graph showing the relationship between the immersion time of the electrode under test and the immersion height of the electrolyte on the electrode under test in some embodiments of this application under different electrode immersion depths.

[0030] Figure 11 This is a graph showing the relationship between the immersion time of the electrode under test and the immersion height of the electrolyte on the electrode under test under different temperature conditions in some embodiments of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] Test apparatus 1; Electrode to be tested 10; Scale 20; Cover 30;

[0033] Box body 100; receiving cavity 110; first sub-cavity 111; second sub-cavity 112; side wall 120; first side wall 121; second side wall 122; third side wall 123; fourth side wall 124; vacuum hole 130; light-transmitting element 140; electrolyte injection port 150; electrolyte discharge port 160; mounting hole 170;

[0034] Clamping assembly 200; slide bar 210; clamping component 220; first clamping member 221; second clamping member 222;

[0035] Voltage module 300; constant voltage source 310; third wire 320;

[0036] Heating module 400; Temperature sensor 410; Heating element 420;

[0037] Temperature control module 500; First wire 510;

[0038] Camera module 600; Camera 610; Second wire 620;

[0039] Control system 700; Communication module 710; Storage module 720; Image processing module 730; Calculation module 740; Drawing module 750; Processor 760;

[0040] Vacuum module 800; vacuum pump 810; first pipeline 820; control valve 830;

[0041] Electrical connection structure 900; first terminal 910; second terminal 920. Detailed Implementation

[0042] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0043] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0044] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0045] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of this application, "several" means one or more, unless otherwise explicitly specified.

[0046] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0047] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0049] In lithium-ion batteries, adequate wetting of the electrodes by the electrolyte is a key factor in ensuring stable battery performance, high energy density, long cycle life, and even safe use. As the carrier of ion transport in the battery, the wettability of the electrolyte directly affects ion conduction efficiency. Poor electrolyte wetting can lead to lithium plating during charging, thereby shortening battery life and even affecting safety.

[0050] In related technologies, when testing the wettability of electrode sheets, the parameters of the environment in which the electrode sheets are located (such as voltage) are different from the parameters of the environment inside the battery cell. This can lead to inaccurate test results, which can easily result in misjudgments of the true performance of the battery cell manufactured based on the electrode sheets, thereby reducing the reliability of the battery cell.

[0051] To address the aforementioned issues, this application provides a testing device that establishes an electrical connection between the electrolyte, the electrode under test, and the voltage module via an electrical connection structure. A constant voltage is applied to the electrolyte and the electrode under test via a constant voltage source in the voltage module, thereby simulating the internal environmental parameters of the battery cell, improving the accuracy of the test results, and ultimately enhancing the reliability of the battery cell.

[0052] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0053] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of the test apparatus 1 provided in some embodiments of this application; Figure 2 for Figure 1 The diagram shows the structure of the test device 1 after removing the cover 30; Figure 3 for Figure 2 The test device 1 shown is a structural schematic diagram from another perspective; the test device 1 includes a housing 100, a cover 30, a clamping assembly 200, a voltage module 300, and an electrical connection structure 900.

[0054] The housing 100 is a rectangular parallelepiped with an open opening. A receiving cavity 110 is defined within the housing 100. The receiving cavity 110 is used to contain the electrolyte used in the test. The cover 30 matches the shape of the open opening of the housing 100 and seals the open opening of the housing 100.

[0055] It should be noted that in some embodiments and figures of this application, the box 100 is only described as a cuboid. However, this application does not limit the shape of the box 100. In other embodiments, the box 100 can also be a cylinder or a polygonal prism.

[0056] The housing 100 includes four side walls 120, and a clamping assembly 200 is disposed on the inner wall surface of any one of the four side walls 120. The clamping assembly 200 is used to clamp the electrode under test 10. In this way, by injecting electrolyte into the receiving cavity so that the electrolyte covers a portion of the electrode under test 10, the wettability of the electrode under test 10 to the electrolyte can be tested. The operation is simple and helps to improve testing efficiency.

[0057] In some embodiments, the four sidewalls 120 include a first sidewall 121, a second sidewall 122, a third sidewall 123, and a fourth sidewall 124, with the first sidewall 121 opposite to the second sidewall 122 and the third sidewall 123 opposite to the fourth sidewall 124; the clamping assembly 200 may be disposed on the inner wall surface of the first sidewall 121.

[0058] It should be noted that the positions of the first sidewall 121 to the fourth sidewall 124 shown in the figure are only examples. In some embodiments, the positions of the first sidewall 121 and the second sidewall 122 can be interchanged; in other embodiments, the positions of the third sidewall 123 and the fourth sidewall 124 can be interchanged; in still other embodiments, the positions of the first sidewall 121 and the second sidewall 122 can be interchanged, and the positions of the third sidewall 123 and the fourth sidewall 124 can also be interchanged.

[0059] The voltage module 300 includes a constant voltage source 310. One end of an electrical connection structure 900 is electrically connected to the constant voltage source 310, and the other end of the electrical connection structure 900 is located inside the housing 100. For example, the positive terminal of the constant voltage source 310 can be electrically connected to the electrode under test 10 or the clamping assembly 200, and the negative terminal of the constant voltage source 310 can be electrically connected to the electrolyte inside the housing 100 through the electrical connection structure 900. In this way, the constant voltage source 310 can apply a constant voltage to the electrode under test 10 and the electrolyte, thereby simulating the environmental parameters inside the battery cell, improving the accuracy of the test results, and thus helping to improve the reliability of the battery cell.

[0060] It is understood that a constant voltage source is an ideal power supply model in which the output voltage remains constant when the load changes. In some embodiments of this application, the constant voltage source can be any power supply that can provide a constant voltage output, or the constant voltage source can be any power supply that can provide an approximately constant voltage output.

[0061] In some embodiments, such as Figures 1 to 3 As shown, the electrical connection structure 900 includes a first terminal 910, which is located on the side wall 120 (such as the second side wall 122) of the enclosure 100. The first terminal 910 is electrically connected to the constant voltage source 310. For example, the first terminal 910 and the constant voltage source 310 are electrically connected via a wire. This shortens the length of the wire, facilitates wiring, and improves the sealing of the enclosure 100, thereby enhancing the reliability of the test.

[0062] In some embodiments, such as Figures 1 to 3 As shown, the cover 30 is sealed to the housing 100. The testing device 1 also includes a vacuum module 800. The vacuum module 800 includes a vacuum pump 810, which is located outside the housing 100 and connected to the inside of the housing 100. The vacuum pump 810 is used to extract air from the housing 100. In this way, the vacuum pump 810 can extract air from the housing 100, creating a negative pressure state inside the housing 100, thereby simulating the environmental parameters inside the battery cell, improving the accuracy of the test results, and thus helping to improve the reliability of the battery cell.

[0063] In some embodiments, such as Figures 1 to 3 As shown, the housing 100 has a vacuum port 130, and the vacuum module 800 also includes a first pipeline 820. The vacuum pump 810 is connected to the vacuum port 130 through the first pipeline 820 to achieve communication between the vacuum pump 810 and the interior of the housing 100.

[0064] like Figure 3 As shown, the vacuum module 800 also includes a control valve 830, which is located at the vacuum port 130 or in the first pipeline 820. The control valve 830 is used to seal the vacuum flow path and can regulate the vacuum rate, thereby improving the stability of the vacuum process. For example, the control valve 830 can be a solenoid valve, an electric valve, or a manual valve, etc., and this application does not limit this.

[0065] Please see Figure 4 and Figure 5 , Figure 4 for Figure 2 Top view of test device 1 shown; Figure 5This is a schematic diagram of the heating module 400 and temperature control module 500 of the testing apparatus 1 provided in some embodiments of this application. The testing apparatus 1 also includes a heating module 400 and a temperature control module 500. The heating module 400 includes a temperature sensor 410 and a heating element 420. The temperature sensor 410 is used to detect the temperature of the electrolyte, and the heating element 420 is disposed inside the housing 100 for heating the electrolyte. The temperature control module 500 is electrically connected to both the temperature sensor 410 and the heating element 420, and is configured to control the heating element 420 to operate or stop operating based on the detection result of the temperature sensor 410. In this way, the heating module 400 and the temperature control module 500 can control the temperature of the electrolyte, thereby simulating the environmental parameters inside the battery cell, improving the accuracy of the test results, and thus contributing to improving the reliability of the battery cell.

[0066] For example, when the heating module 400 is turned on, the temperature sensor 410 begins to detect the temperature of the electrolyte and feeds back temperature data to the temperature control module 500. When the temperature data fed back by the temperature sensor 410 is lower than a first preset temperature, the temperature control module 500 controls the heating element 420 to operate to heat the electrolyte. When the temperature data fed back by the temperature sensor 410 is higher than a second preset temperature, the temperature control module 500 controls the heating element 420 to stop operating. The second preset temperature is higher than the first preset temperature. In this way, the heating module 400 and the temperature control module 500 can maintain the temperature of the electrolyte between the first preset temperature and the second preset temperature, thereby achieving precise control of the electrolyte temperature.

[0067] For example, the temperature sensor 410 can be a thermocouple, and the heating element 420 can be a heating rod or heating wire, etc.

[0068] In some embodiments, the heating element 420 is coated with polytetrafluoroethylene (PTFE). It is understood that PTFE has good high-temperature resistance and is chemically stable, and will not react chemically with the electrolyte. This is beneficial for improving the operational stability and reliability of the heating element 420, and for extending its service life.

[0069] In some embodiments, such as Figures 1 to 3 As shown, the electrical connection structure 900 also includes a second terminal 920, which is located on the side wall 120 (e.g., the second side wall 122) of the housing 100. The second terminal 920 is electrically connected to the temperature control module 500 and the heating module 400. This shortens the length of the wires, facilitates wiring, and improves the sealing of the housing 100, thereby enhancing the reliability of the test.

[0070] It is understood that the voltage module 300, temperature control module 500, and vacuum module 800 in some of the above embodiments can control the voltage, temperature, and ambient air pressure of the electrode 10 under test and the electrolyte. This allows for the simulation of the actual internal environmental parameters of the battery cell using these three parameters, improving the accuracy of the test results and the reliability of the battery cell. Furthermore, based on the control and adjustment of these three parameters, the testing device 1 of this application can also be used for research and development experiments on electrode materials. Specifically, it can be used to study the influence of at least one of voltage, temperature, and air pressure on the wettability of the electrode material. This allows for a more comprehensive understanding of the wettability of electrode materials in the research and development stage to the electrolyte, which is beneficial for improving the efficiency of electrode material research and development.

[0071] Please refer to 6. Figure 6 for Figure 2 The diagram shows the structure of the clamping assembly 200 of the test device 1. The clamping assembly 200 includes a slide rod 210 and a clamping component 220. The slide rod 210 is vertically disposed on the inner wall surface of the side wall 120 of the housing 100 (i.e., the inner peripheral wall of the housing 100). The clamping component 220 includes a first clamping member 221 and a second clamping member 222. Both the first clamping member 221 and the second clamping member 222 are slidably connected to the slide rod 210 in the vertical direction. The clamping component 220 has a first state and a second state. In the first state, the first clamping member 221 and the second clamping member 222 move synchronously and cooperate to clamp the electrode 10 to be tested. In the second state, the first clamping member 221 and the second clamping member 222 can move relative to each other in the vertical direction.

[0072] Understandably, when the clamping component 220 is in the first state, the first clamping member 221 and the second clamping member 222 can clamp the electrode under test 10 and drive the electrode under test 10 to move in the vertical direction, thereby adjusting the depth of immersion of the electrode under test 10 in the electrolyte. This facilitates the study of the effect of the immersion depth of the electrode under test 10 on the wetting effect of the electrode under test 10 and provides standardized test conditions for this study. When the clamping component 220 is in the second state, the first clamping member 221 and the second clamping member 222 can move away from each other to remove the electrode under test 10 clamped in the clamping component 220, or the first clamping member 221 and the second clamping member 222 can move closer to each other to form a clamp on the electrode under test 10. This facilitates the replacement of the electrode under test 10 and helps to improve test efficiency.

[0073] In some embodiments, such as Figures 2 to 4As shown, the testing device 1 also includes a scale 20, which is vertically mounted on the inner wall of the housing 100 and located on one side of the clamping assembly 200. This facilitates the observation and reading of the electrolyte wetting height on the electrode under test 10.

[0074] In some embodiments, such as Figure 1 and Figure 4 As shown, the testing device 1 also includes a camera module 600. The camera module 600 is used to take pictures of the clamping assembly 200 and the scale 20 to record the wetting height data of the electrolyte on the electrode under test 10.

[0075] For example, the camera module 600 includes a camera 610, and the housing 100 has a mounting hole 170, which is located on the second side wall 122, and the camera 610 is located in the mounting hole 170.

[0076] The scale 20 is vertically mounted on the inner wall surface of the first side wall 121 and located on one side of the clamping assembly 200. Alternatively, the scale 20 can be vertically mounted on the inner wall surface of the third side wall 123 or the fourth side wall 124. This allows the camera 610 to simultaneously capture images of the clamping assembly 200 and the scale 20, which helps improve the accuracy of readings of the electrolyte wetting height on the electrode under test 10.

[0077] In some embodiments, such as Figure 3 and Figure 4 As shown, the housing 100 is equipped with a light-transmitting element 140, which divides the receiving cavity 110 into a first sub-cavity 111 and a second sub-cavity 112. The first sub-cavity 111 is used to contain the electrolyte, and at least a portion of the camera module 600 (such as at least a portion of the camera 610) is located in the second sub-cavity 112. In this way, the light-transmitting element 140 can separate the camera 610 from the electrolyte, preventing the electrolyte from submerging the camera 610, which helps to improve the reliability of the camera module 600.

[0078] For example, the light-transmitting element 140 can be a transparent partition. This partition can be located in the middle of the housing 100 along the arrangement direction of the first sidewall 121 and the second sidewall 122, and extend along the arrangement direction of the third sidewall 123 and the fourth sidewall 124, to divide the receiving cavity 110 into a first sub-cavity 111 and a second sub-cavity 112. Alternatively, the light-transmitting element 140 can be a transparent cover, disposed on the inner wall surface of the second sidewall 122, and covering the outside of the camera 610. This application does not limit the implementation form of the light-transmitting element 140; as long as the light-transmitting element 140 can achieve isolation between the camera 610 and the electrolyte, it should be within the protection scope of this application.

[0079] In some embodiments, such as Figure 2 and Figure 3As shown, the housing 100 has an electrolyte inlet 150 and an electrolyte outlet 160. Both the electrolyte inlet 150 and the electrolyte outlet 160 are connected to the receiving cavity; along the height direction of the housing 100, the electrolyte inlet 150 is higher than the electrolyte outlet 160. This facilitates the injection of electrolyte into the receiving cavity or the discharge of electrolyte from the receiving cavity.

[0080] In some embodiments, the testing apparatus 1 further includes a suction pump (not shown), and the electrolyte discharge port 160 is connected to the suction pump via a pipeline. The suction pump is used to draw out the electrolyte from the receiving cavity, thereby improving the electrolyte discharge efficiency and thus improving the testing efficiency.

[0081] Please see Figure 7 , Figure 7 This is a block diagram of the control system 700 of the testing apparatus 1 provided in some embodiments of this application. The testing apparatus 1 also includes the control system 700, and a temperature control module 500, a vacuum module 800, a camera module 600, and a voltage module 300 are all communicatively connected to the control system 700. The control system 700 is configured to: control the temperature control module 500 to adjust the temperature of the electrolyte; control the vacuum module 800 to adjust the air pressure inside the chamber 100; control the voltage module 300 to apply voltage to the electrolyte and the electrode under test; and control the camera module 600 to take pictures of the clamping assembly 200 and the scale 20. Thus, through the control system 700, the temperature control module 500, the vacuum module 800, the camera module 600, and the voltage module 300 can be controlled in a coordinated manner. Therefore, when the testing apparatus 1 is used for electrode material research and development, it can accurately control various environmental parameters, thereby improving the reliability and repeatability of experimental data, eliminating observation errors, and thus improving research and development efficiency. When the testing device 1 is used for industrial quality inspection, it helps to achieve standardized and automated testing processes, improve the consistency of cell quality criteria, and increase testing efficiency.

[0082] In some embodiments, such as Figure 7 As shown, the control system 700 includes: a processor 760, a communication module 710, a storage module 720, an image processing module 730, a computing module 740, and a drawing module 750. The communication module, storage module, image processing module, computing module, and drawing module are all coupled to the CPU (e.g., via electrical or communication connection).

[0083] The processor 760 can be used to control the operation of various components in the control system 700 so that the various components of the control system 700 can operate to achieve the predetermined functions of the test device 1.

[0084] The processor 760 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof.

[0085] Processor 760 can also be any other device with processing capabilities, such as circuitry, components, or software modules. Processor 760 can also include multiple CPUs, and processor 760 can be a single-core processor or a multi-core processor. Here, processor can refer to one or more devices, circuits, or processing cores used to process data (such as computer program instructions).

[0086] The communication module 710 is used for communicative connection with the temperature control module 500, the vacuum module 800, the camera module 600, and the voltage module 300. In some embodiments, the communication module 710 is also used for communicating with a communication network (such as Ethernet, radio access network (RAN), wireless local area network (WLAN)). For example, the communication module 710 may be a module, circuit, transceiver, or any device capable of communication.

[0087] For example, see Figure 7 The temperature control module 500 includes a first wire 510, and the communication module 710 can be coupled to the temperature control module 500 through the first wire 510. The camera module 600 includes a second wire 620, and the communication module 710 can be coupled to the camera module 600 through the second wire 620. The voltage module 300 includes a third wire 320, and the communication module 710 can be coupled to the voltage module 300 through the third wire 320.

[0088] The storage module 720 is used to store data generated by other modules, such as images and / or videos captured by the camera module 600.

[0089] The storage module 720 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or it may be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application does not limit this application.

[0090] The image processing module 730 is used to process the images and / or videos stored in the storage module 720.

[0091] The calculation module 740 is used to calculate the wetting rate of the electrode 10 under test.

[0092] The plotting module 750 is used to generate a graph showing the relationship between the immersion time of the electrode under test 10 and the immersion height of the electrolyte on the electrode under test 10.

[0093] Thus, the control system 700 can automatically calculate the wetting rate of the electrode under test 10 and generate a curve based on the wetting time of the electrode under test 10 and the wetting height of the electrolyte on the electrode under test 10, thereby eliminating human observation errors and improving testing efficiency and data accuracy.

[0094] It should be noted that the structure in the control system 700 does not constitute a specific limitation on the control system 700. In some embodiments, the control system 700 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0095] The following will introduce a case study of the test device 1 used for the research and development of electrode materials, using several embodiments.

[0096] The effects of four parameters—voltage, air pressure, electrode immersion depth, and temperature—on the wetting performance of the electrode under test are described.

[0097] Example 1

[0098] The effect of applied voltage on the electrolyte wettability of the electrode under test was verified. First, the electrode sheet was cut into a 20mm×100mm electrode under test 10 and fixed to the clamping assembly 200. Then, the electrolyte temperature was controlled at 25℃ by the temperature control module 500 and the pressure inside the chamber 100 was controlled at -300Kpa by the vacuum module 800. The clamping assembly 200 was adjusted so that the electrode under test 10 was immersed in the electrolyte to a height of 10mm.

[0099] Thus, the experiment was conducted in three groups. Voltages of 0V, 0.1V, and 0.3V were applied to the electrolyte and the electrode under test 10 via the voltage module 300. The camera module 600 captured images of the electrode under test 10 and the scale 20 every minute. The image processing module 730 analyzed and processed these images to obtain the wetting height data of the electrode under test 10. Then, the plotting module 750 generated a curve showing the relationship between the wetting time of the electrode under test 10 and the wetting height of the electrolyte on the electrode under test 10. Figure 8 As shown, it can be seen that after applying voltage, the wetting height of the electrode under test 10 to the electrolyte is significantly increased in the same amount of time, indicating that increasing the voltage between the electrode under test 10 and the electrolyte can effectively increase the wetting speed of the electrode under test 10 to the electrolyte.

[0100] Example 2

[0101] The effect of negative pressure environment on the electrolyte wettability of the electrode under test was verified. First, the electrode sheet was cut into a 20mm×100mm electrode under test 10 and fixed to the clamping assembly 200. Then, the electrolyte temperature was controlled at 25℃ by the temperature control module 500, and a voltage of 0V was applied to the electrolyte and the electrode under test 10 by the voltage module 300. The clamping assembly 200 was adjusted so that the electrode under test 10 was immersed in the electrolyte to a height of 10mm.

[0102] Thus, the experiment was conducted in three groups. The vacuum module 800 controlled the pressure inside the chamber 100 to be 0 kPa, -100 kPa, and -300 kPa, respectively. The camera module 600 captured images of the electrode 10 and the scale 20 every 5 minutes. The image processing module 730 analyzed and processed the images to obtain the immersion height data of the electrode 10. Then, the plotting module 750 generated a curve between the immersion time of the electrode 10 and the immersion height of the electrolyte on the electrode 10, as shown in the figure. Figure 9 As shown, under negative pressure, the wetting height of the electrode under test 10 to the electrolyte was significantly increased in the same amount of time, indicating that placing the electrode under test 10 under negative pressure can effectively increase the wetting speed of the electrode under test 10 to the electrolyte.

[0103] Example 3

[0104] The effect of electrolyte immersion depth on the electrolyte wettability of the electrode under test was verified. First, the electrode sheet was cut into a 20mm×100mm electrode under test 10 and fixed to the clamping assembly 200. Then, the electrolyte temperature was controlled at 25℃ by the temperature control module 500 and the pressure inside the chamber 100 was controlled at -300Kpa by the vacuum module 800.

[0105] Thus, three groups of experiments were conducted, adjusting the clamping assembly 200 to immerse the electrode 10 in the electrolyte to heights of 10mm, 30mm, and 50mm, respectively. The camera module 600 captured images of the electrode 10 and the scale 20 every minute. The image processing module 730 analyzed and processed these images to obtain the immersion height data of the electrode 10. Then, the plotting module 750 generated a curve showing the relationship between the immersion time of the electrode 10 and the immersion height of the electrolyte on the electrode 10. Figure 10 As shown, it can be seen that the wetting height of the electrode under test 10 varies significantly under different immersion depths.

[0106] Example 4

[0107] The effect of electrolyte temperature on the electrolyte wettability of the electrode under test was verified. First, the electrode sheet was cut into a 20mm×100mm electrode under test 10 and fixed to the clamping assembly 200. Then, a voltage of 0V was applied to the electrolyte and the electrode under test 10 through the voltage module 300, and the pressure inside the chamber 100 was controlled to -100Kpa through the vacuum module 800. The clamping assembly 200 was adjusted so that the electrode under test 10 was immersed in the electrolyte to a height of 10mm.

[0108] Thus, the experiment was conducted in three groups. The temperature control module 500 controlled the electrolyte temperature at 25℃, 30℃, and 45℃ respectively. The camera module 600 captured images of the electrode 10 and the scale 20 every 2 minutes. The image processing module 730 analyzed and processed the images to obtain the wetting height data of the electrode 10. Then, the plotting module 750 generated a curve between the wetting time of the electrode 10 and the wetting height of the electrolyte on the electrode 10, as shown in the figure. Figure 11 As shown, it can be seen that after increasing the temperature, the wetting height of the electrode under test 10 to the electrolyte was significantly increased in the same amount of time, indicating that increasing the temperature of the electrolyte can effectively increase the wetting speed of the electrode under test 10 to the electrolyte.

[0109] Through the above four embodiments, it can be seen that the test device 1 of this application can verify the wettability differences caused by changes in environmental parameters such as voltage, pressure, immersion depth, and temperature.

[0110] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0111] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0112] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0113] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A testing device (1), characterized in that, include: A housing (100) having a defined receiving cavity (110) for containing electrolyte; A clamping assembly (200) for clamping the electrode to be tested (10); A voltage module (300), the voltage module (300) including a constant voltage source (310); and An electrical connection structure (900) is provided, one end of which is electrically connected to the constant voltage source (310), and the other end of which is located inside the housing (100).

2. The testing apparatus (1) according to claim 1, characterized in that, The electrical connection structure (900) includes a first terminal (910), which is located on the side wall (120) of the housing (100) and is electrically connected to the constant voltage source (310).

3. The testing apparatus (1) according to claim 1, characterized in that, The testing device (1) also includes a vacuum pump (810), which is located outside the housing (100) and connected to the inside of the housing (100).

4. The testing apparatus (1) according to claim 3, characterized in that, The housing (100) has a vacuum port (130), and the vacuum pump (810) is connected to the vacuum port (130) through a first pipe (820); The testing device (1) further includes a control valve (830), which is located at the vacuum port (130) or in the first pipeline (820).

5. The testing apparatus (1) according to claim 1, characterized in that, The testing device (1) further includes a heating module (400) and a temperature control module (500); the heating module (400) includes: Temperature sensor (410) for detecting the temperature of the electrolyte; A heating element (420) is disposed inside the housing (100) for heating the electrolyte; The temperature control module (500) is electrically connected to the temperature sensor (410) and the heating element (420), and the temperature control module (500) is configured to control the heating element (420) to work or stop working based on the detection result of the temperature sensor (410).

6. The testing apparatus (1) according to claim 1, characterized in that, The clamping assembly (200) includes: A slide bar (210), which is vertically disposed on the inner peripheral wall of the housing (100); and A clamping component (220) includes a first clamping member (221) and a second clamping member (222). Both the first clamping member (221) and the second clamping member (222) are slidably connected to the slide rod (210) in the vertical direction. The clamping component (220) has a first state and a second state. In the first state, the first clamping member (221) and the second clamping member (222) move synchronously and cooperate with each other to clamp the electrode to be tested (10). In the second state, the first clamping member (221) and the second clamping member (222) can move relative to each other in the vertical direction.

7. The testing apparatus (1) according to claim 1, characterized in that, The testing device (1) also includes a scale (20), which is vertically mounted on the inner wall of the box (100) and located on one side of the clamping assembly (200).

8. The testing apparatus (1) according to claim 7, characterized in that, The testing device (1) further includes a camera module (600) for taking pictures of the clamping assembly (200) and the scale (20).

9. The testing apparatus (1) according to claim 1, characterized in that, The testing device (1) further includes: a camera module (600) for taking pictures toward the clamping assembly (200); The housing (100) is provided with a light-transmitting element (140) to divide the receiving cavity (110) into a first sub-cavity (111) and a second sub-cavity (112); the first sub-cavity (111) is used to contain the electrolyte, and at least a portion of the camera module (600) is located in the second sub-cavity (112).

10. The testing apparatus (1) according to claim 1, characterized in that, The testing device (1) also includes: Temperature control module (500), vacuum module (800), camera module (600), and control system (700); The temperature control module (500), the vacuum module (800), the camera module (600), and the voltage module (300) are all communicatively connected to the control system (700); the control system (700) is configured to: The temperature control module (500) is controlled to adjust the temperature of the electrolyte; Control the vacuum module (800) to adjust the air pressure inside the chamber (100); The voltage module (300) is controlled to apply voltage to the electrolyte and the electrode under test (10); and The camera module (600) is controlled to take a picture toward the clamping assembly (200).

11. The testing apparatus (1) according to claim 10, characterized in that, The control system (700) includes: A communication module (710) is used to communicate with the temperature control module (500), the vacuum module (800), the camera module (600), and the voltage module (300); A storage module (720) is provided for storing images and / or videos captured by the camera module (600); An image processing module (730) is used to process images and / or videos stored in the storage module (720); A calculation module (740) is used to calculate the wetting rate of the electrode under test (10); A plotting module (750) is used to generate a curve between the immersion time of the electrode under test (10) and the immersion height of the electrolyte on the electrode under test (10).

12. The testing apparatus (1) according to claim 1, characterized in that, The housing (100) has an electrolyte inlet (150) and an electrolyte outlet (160); both the electrolyte inlet (150) and the electrolyte outlet (160) are connected to the receiving cavity (110); along the height direction of the housing (100), the electrolyte inlet (150) is higher than the electrolyte outlet (160).

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