Measuring equipment and battery production system

Abstract

The utility model provides a measuring device and a battery production system. The measuring equipment comprises a box body, a conductive substrate, a detection part and an electrochemical workstation, and the box body is provided with a containing cavity used for containing electrolyte. The conductive substrate is arranged in the accommodating cavity and is used for installing a to-be-tested pole piece. A detection part is arranged at one end, facing the conductive substrate, of the detection part, and is used for constructing a first symmetrical battery structure in cooperation with the to-be-detected pole piece and the electrolyte. The electrochemical workstation is electrically connected to the detection piece and the conductive substrate and is used for outputting voltage and obtaining first impedance of the first symmetrical battery structure, the first impedance is used for determining third impedance of the to-be-detected pole piece in cooperation with second impedance of the detection piece, and the third impedance is used for determining tortuosity of the to-be-detected pole piece. According to the invention, the measurement efficiency of the tortuosity of the pole piece can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a measuring device and a battery production system. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] Torque, the ratio of the actual path length of the dielectric material through the electrode to the electrode thickness, is a key parameter for evaluating battery performance. Currently, the battery industry uses limited and simplistic methods to characterize the tortuosity of lithium-ion battery electrodes, making it difficult to calculate electrode tortuosity accurately and efficiently. Utility Model Content

[0004] In view of the above problems, this application provides a measuring device and a battery production system that can effectively improve the measurement efficiency of electrode tortuosity.

[0005] In a first aspect, embodiments of this application provide a measuring device, which includes a housing, a conductive substrate, a detection component, and an electrochemical workstation. The housing has a receiving cavity for containing an electrolyte. The conductive substrate is disposed within the receiving cavity and is used to mount an electrode to be tested. A detection element is disposed at one end of the detection component facing the conductive substrate. The detection element is used to cooperate with the electrode to be tested and the electrolyte to construct a first symmetrical battery structure. The electrochemical workstation is electrically connected to the detection element and the conductive substrate. The electrochemical workstation is used to output a voltage and obtain a first impedance of the first symmetrical battery structure. The first impedance is used to determine a third impedance of the electrode to be tested in conjunction with a second impedance of the detection element. The third impedance is used to determine the tortuosity of the electrode to be tested.

[0006] The above technical solution pre-constructs a measuring device capable of measuring the tortuosity of electrode sheets. When the tortuosity of an electrode sheet needs to be measured, it is only necessary to install the electrode sheet to be tested onto a conductive substrate and inject electrolyte to perform the tortuosity measurement. The operation is convenient and quick, consumes less time, and can effectively improve the measurement efficiency of electrode sheet tortuosity.

[0007] In some embodiments of the first aspect, the detection element is configured to be movable relative to the conductive substrate.

[0008] The above technical solution improves the measurable range of the probe by setting the probe to be movable relative to the conductive substrate, enabling the probe to measure the tortuosity of different regions of the electrode to be measured, thereby effectively improving the measurement accuracy and efficiency of the electrode tortuosity.

[0009] In some embodiments of the first aspect, the measuring device includes a drive unit connected to the detection component and used to drive the detection component to move.

[0010] The above technical solution improves the automation level of the measuring equipment by introducing a driving device to drive the movement of the detection component.

[0011] In some embodiments of the first aspect, the measuring device further includes a force control device connected between the driving device and the detection component, the force control device being used to control the pressure applied by the detection component to the electrode under test to remain within a preset range.

[0012] The above technical solution, by introducing a force control device, can maintain the pressure applied to the electrode under test by the probe component within a preset range, significantly reducing measurement errors caused by pressure fluctuations during the measurement process. Furthermore, it can also, to some extent, prevent damage to the electrode under test due to excessive pressure applied by the probe component, or affect the measurement results due to insufficient pressure applied by the probe component.

[0013] In some embodiments of the first aspect, the measuring device further includes a buffer component connected between the drive device and the probe component, the buffer component being configured to undergo elastic deformation under external force.

[0014] The buffer component effectively absorbs the impact of external forces generated during the movement of the drive device, preventing uneven pressure applied to the electrode under test by the probe component due to mechanical vibration or torque fluctuations, thereby significantly improving the stability of the measurement process. Furthermore, because the buffer component can mitigate pressure fluctuations through elastic deformation, the probe component can maintain more stable contact with the electrode under test, thus reducing errors caused by sudden pressure changes during measurement.

[0015] In some embodiments of the first aspect, the enclosure includes a main body and a movable part, the movable part being movably connected to the main body and configured to move relative to the main body along a first direction, the movable part being disposed opposite to a conductive substrate along a second direction. A detection component is movably connected to the movable part and configured to move relative to the movable part along a second direction, the first direction intersecting the second direction.

[0016] The above technical solution enables multi-directional movement of the detection component while maintaining a closed environment within the enclosure, reducing the impact of the external environment on the measurement during the movement of the detection component and improving measurement accuracy. Furthermore, the above-mentioned structure is simple, reducing the overall complexity of the measuring equipment and helping to lower manufacturing costs.

[0017] In some embodiments of the first aspect, the box body includes a first box portion and a second box portion, which are disposed opposite to each other along a second direction and cover each other. The first box portion and the second box portion are detachably connected, and the first box portion and the second box portion together define a receiving cavity. A conductive substrate is connected to the first box portion, and a movable portion is connected to the second box portion.

[0018] The above technical solution, through the detachable design of the first and second housings, can improve the overall ease of use and maintenance of the measuring equipment, and reduce the cost of component replacement and maintenance.

[0019] In some embodiments of the first aspect, a calibration element is provided on the conductive substrate. The calibration element has a preset impedance and is used to construct a second symmetrical battery structure in conjunction with a detection element and an electrolyte. The electrochemical workstation is also used to obtain a fourth impedance of the second symmetrical battery structure, which is used in conjunction with the preset impedance to determine the second impedance.

[0020] Before measuring the tortuosity of the electrode under test, the above technical solution first calibrates the second impedance of the test piece using a calibration component to improve the accuracy of the second impedance of the test piece, thereby reducing the measurement error of the tortuosity of the electrode under test and improving the measurement accuracy of the tortuosity of the electrode.

[0021] In some embodiments of the first aspect, the detection component includes a connector and a probe. The connector is connected to a housing, and the probe is connected to one end of the connector and located within a receiving cavity. The probe and the connector are detachably connected. A detection element is connected to the end of the probe away from the connector.

[0022] The above technical solution can effectively improve the ease of replacing the test piece, reduce time costs, and further improve measurement efficiency.

[0023] In some embodiments of the first aspect, the connector includes a first fixing portion and a first conductive portion, the first conductive portion being connected to the first fixing portion. The probe includes a second fixing portion and a second conductive portion, the second conductive portion being connected to the second fixing portion, the first fixing portion and the second fixing portion being detachably connected, the first conductive portion abutting against the second conductive portion, and a detection element being connected to the end of the second conductive portion away from the first conductive portion. An electrochemical workstation is electrically connected to the first conductive portion.

[0024] The detection component of the above technical solution has a simple and reliable structure, which helps to reduce the overall structural complexity of the measurement setup and reduce costs.

[0025] In some embodiments of the first aspect, the first conductive portion includes a main body portion and an abutment portion. The abutment portion is connected to one end of the main body portion facing the second conductive portion and is used to abut against the second conductive portion. The abutment portion is configured to undergo elastic deformation under the action of an external force. When the abutment portion abuts against the second conductive portion, the abutment portion is in a compressed state.

[0026] When the contact portion comes into contact with the second conductive portion, it enters a compressed state. The main function of this compressed state is to absorb mechanical vibration or external impact through elastic deformation, avoiding the risk of electrical connection breakage due to contact gaps, and improving the reliability of the electrical connection between the first and second conductive portions. At the same time, the compression deformation can provide constant contact pressure, reducing problems such as increased resistance or unstable electrical signal transmission caused by insufficient contact pressure.

[0027] In some embodiments of the first aspect, the first conductive portion includes a first body and a first plating layer, the first plating layer being disposed on the outer surface of the first body, and the corrosion resistance of the first plating layer being higher than that of the first body; and / or, the second conductive portion includes a second body and a second plating layer, the second plating layer being disposed on the outer surface of the second body, and the corrosion resistance of the second plating layer being higher than that of the second body.

[0028] The above technical solution can effectively improve the corrosion resistance of the first conductive part and / or the second conductive part, enabling the first conductive part and / or the second conductive part to maintain stability in corrosive environments such as electrolytes for a long time, thereby improving the service life of the detection component.

[0029] In some embodiments of the first aspect, the measuring device further includes a temperature control device connected to the chamber, the temperature control device being used to control the temperature inside the chamber to remain within a preset range.

[0030] The above technical solution introduces a temperature control device to control the temperature inside the chamber and maintain it within a preset range. This improves the stability of the ambient temperature during the measurement process, reduces the impact of temperature fluctuations on the measurement results, and thus enhances the measurement accuracy and reliability of the measuring equipment.

[0031] In some embodiments of the first aspect, the measuring device further includes a gas exchange device connected to the containment cavity, the gas exchange device being used to evacuate the containment cavity or to introduce protective gas into the containment cavity.

[0032] The above technical solution, by introducing a gas exchange device, can create a specific gas environment in the containment cavity according to the test requirements, effectively reducing the interference of oxygen or moisture on the measurement process and improving the accuracy of the measurement.

[0033] In some embodiments of the first aspect, the measuring device further includes a liquid exchange device connected to the receiving cavity, the liquid exchange device being used to inject electrolyte into the receiving cavity or to drain electrolyte from the receiving cavity.

[0034] The above technical solution, by introducing a liquid exchange device, enables automated injection and discharge of electrolyte, reduces manual operation steps, significantly improves the operating efficiency of measuring equipment, and enhances measurement efficiency.

[0035] In some embodiments of the first aspect, the measuring device further includes a cleaning device disposed adjacent to the housing, the cleaning device being used to clean the detection components.

[0036] The above technical solution, by introducing a cleaning device, can quickly and efficiently remove contaminants from the surface of the probe components, thereby maintaining the reusability of the measuring equipment and the accuracy of the test results.

[0037] Secondly, this application provides a battery production system, which includes the measuring equipment provided in any embodiment of the first aspect.

[0038] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0040] Figure 1 This is a schematic diagram of the layout structure of a measuring device provided in some embodiments of this application;

[0041] Figure 2 This is a partial structural detail diagram of an electrical measuring device provided in some embodiments of this application;

[0042] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along AA;

[0043] Figure 4 This is a schematic diagram of the structure of a detection component of an electrical measuring device provided in some embodiments of this application;

[0044] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along BB;

[0045] Figure 6 for Figure 5 The diagram shown illustrates the exploded structure.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] 100. Electrode to be tested; 200. Electrolyte;

[0048] 10. Box body; 11. Receiving cavity; 12. Box body; 121. First box section; 122. Second box section; 13. Movable section;

[0049] 20. Conductive substrate; 21. Calibration component;

[0050] 30. Detection component; 31. Detection element; 32. Connector; 321. First fixing part; 322. First conductive part; 3221. Main body part; 3222. Abutting part; 33. Probe; 331. Second fixing part; 332. Second conductive part; 34. Isolation membrane;

[0051] 40. Electrochemical workstation;

[0052] 50. Drive unit;

[0053] 60. Force control device;

[0054] 70. Buffer components;

[0055] 81. Temperature control device; 82. Gas exchange device; 83. Liquid exchange device; 84. Cleaning device;

[0056] X, the first direction; Y, the second direction. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0059] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0061] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0063] In this application, "multiple" means two or more (including two).

[0064] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0065] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0066] Battery cells contain various types of pores in their electrodes. Currently, the pore structure of electrodes is mainly described by parameters such as porosity, pore size, pore size distribution, and tortuosity, which determine the number and morphology of pores. Tortuosity, the ratio of the actual path length of the dielectric material through the electrode to the electrode thickness, is a key parameter for evaluating battery performance. However, current methods for characterizing the tortuosity of lithium-ion battery electrodes are limited and difficult to calculate accurately and efficiently.

[0067] For example, in related technologies, symmetrical cells typically need to be fabricated separately before being transferred to an electrochemical impedance spectroscopy (EIS) instrument for testing. That is, a symmetrical cell electrode assembly must first be formed using a pair of single-sided electrodes and a separator, then this assembly must be placed in a package, an electrolyte injected into the package, and allowed to stand for at least 24 hours to form a symmetrical cell before tortuosity testing and evaluation can be performed. The assembly of the symmetrical cell and the time required for standing are costly, severely impacting the efficiency of tortuosity measurement.

[0068] Based on the above considerations, this application designs a measuring device, which includes a housing, a conductive substrate, a detection component, and an electrochemical workstation. The housing has a receiving cavity for containing an electrolyte. The conductive substrate is disposed within the receiving cavity and is used to mount the electrode to be tested. A detection element is disposed at one end of the detection component facing the conductive substrate. The detection element is used to cooperate with the electrode to be tested and the electrolyte to construct a first symmetrical battery structure. The electrochemical workstation is electrically connected to the detection element and the conductive substrate. The electrochemical workstation is used to output a voltage and obtain the first impedance of the first symmetrical battery structure. The first impedance is used to determine the third impedance of the electrode to be tested in conjunction with the second impedance of the detection element. The third impedance is used to determine the tortuosity of the electrode to be tested.

[0069] By pre-constructing a measuring device capable of measuring electrode tortuosity, when the tortuosity of an electrode needs to be measured, simply install the electrode to be tested onto a conductive substrate and inject electrolyte to perform the measurement. The operation is convenient, quick, and time-efficient, effectively improving the measurement efficiency of electrode tortuosity.

[0070] The measuring device provided in the embodiments of this application will now be described in conjunction with the accompanying drawings. Figure 1 This is a schematic diagram of the layout structure of a measuring device provided in some embodiments of this application. Figure 2 This is a partial structural detail diagram of an electrical measuring device provided in some embodiments of this application. Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure along AA. Figure 4 This is a schematic diagram of the structure of a detection component of an electrical measuring device provided in some embodiments of this application. Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure along BB. Figure 6 for Figure 5 The diagram shown illustrates the exploded structure.

[0071] refer to Figures 1 to 6 This application provides a measuring device, which includes a housing 10, a conductive substrate 20, a detection component 30, and an electrochemical workstation 40. The housing 10 has a receiving cavity 11 for containing an electrolyte 200. The conductive substrate 20 is disposed within the receiving cavity 11 and is used to mount a test electrode 100. A detection element 31 is disposed at one end of the detection component 30 facing the conductive substrate 20. The detection element 31 is used to cooperate with the test electrode 100 and the electrolyte 200 to construct a first symmetrical battery structure. The electrochemical workstation 40 is electrically connected to the detection element 31 and the conductive substrate 20. The electrochemical workstation 40 is used to output voltage and obtain a first impedance of the first symmetrical battery structure. The first impedance is used to determine a third impedance of the test electrode 100 in conjunction with a second impedance of the detection element 31. The third impedance is used to determine the tortuosity of the test electrode 100.

[0072] The housing 10 is a component used to form the measurement environment of the measuring device. This measurement environment can house the conductive substrate 20, the probe component 30, the electrode under test 100, the electrolyte 200, and other components. Optionally, the housing 10 can be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, polyvinyl chloride, or wood.

[0073] In some examples, the housing 10 can be sealed so that the receiving cavity 11 is sealed when the tortuosity of the electrode is measured, thus isolating it from the external environment, reducing the influence of the external environment on the tortuosity measurement of the electrode, and improving the measurement accuracy.

[0074] When measuring the tortuosity of the electrode, the electrolyte 200 added to the cavity 11 has a similar or identical composition to the electrolyte 200 used in the battery cell under test, so as to restore the actual electrochemical state inside the battery cell under test as much as possible.

[0075] As an example, electrolyte 200 includes an electrolyte salt and a solvent.

[0076] As an example, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0077] As an example, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0078] As an example, the electrolyte 200 may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0079] The conductive substrate 20 can be detachably connected to the housing 10 or integrally mounted on the housing 10. The conductive substrate 20 can be directly connected to the housing 10 or constrained to the housing 10 by other components. As an example, the connection method between the conductive substrate 20 and the housing 10 can be, but is not limited to, welding, riveting, or bonding.

[0080] The conductive substrate 20 primarily functions to conduct electricity, transferring the voltage output from the electrochemical workstation 40 to the electrode under test 100. As an example, the conductive substrate 20 has a detection area, in which the electrode under test 100 is disposed.

[0081] The electrode under test 100 can be directly connected to the conductive substrate 20, or it can be constrained to the conductive substrate 20 by other components.

[0082] Optionally, the conductive substrate 20 may be, but is not limited to, a sheet-like structure, a plate-like structure, or a block-like structure.

[0083] The detection component 30 is equipped with a detection element 31 to cooperate with the electrode under test 100 and the electrolyte 200 to construct a first symmetrical battery structure, so as to realize the measurement of the tortuosity of the electrode under test 100.

[0084] The electrode sheet directly removed from the battery cell under test can be used as the electrode sheet under test 100. For example, the positive electrode sheet of the battery can be directly removed and the electrode sheet under test 100 can be made using the original positive electrode sheet; or the negative electrode sheet of the battery can be directly removed and the electrode sheet under test 100 can be made using the original negative electrode sheet.

[0085] The test element 31 is used to simulate the electrode sheet 100 under test. For example, a portion of the electrode sheet directly removed from the battery cell under test can be used as the electrode sheet 100 under test, and another portion can be used as the test element 31. Alternatively, a simulated electrode sheet with the same properties as the electrode sheet 100 under test can be remanufactured according to a specific method and used as the test element 31.

[0086] It should be noted that the detection element 31, the electrode under test 100, and the electrolyte 200 form a first symmetrical battery structure. A separator 34 is disposed between the detection element 31 and the electrode under test 100, with at least a portion of the separator 34 located between the detection element 31 and the electrode under test 100. During the process of applying an AC voltage to the detection element 31 and the electrode under test 100 by the electrochemical workstation 40, active ions (e.g., lithium ions) repeatedly insert and extract between the detection element 31 and the electrode under test 100. The separator 34, disposed between the detection element 31 and the electrode under test 100, can prevent short circuits between the detection element 31 and the electrode under test 100, while allowing active ions to pass through.

[0087] In some examples, the isolation membrane 34 is connected to the detection element 30, and at least a portion of the isolation membrane 34 covers the side of the detection element 31 facing the conductive substrate 20.

[0088] The detection element 31 can be detachably connected to the detection component 30, or it can be integrally mounted on the detection component 30. The detection element 31 can be directly connected to the detection component 30, or it can be constrained to the detection component 30 by other components. As an example, the connection method between the detection element 31 and the detection component 30 can be, but is not limited to, welding, riveting, snap-fitting, or bonding.

[0089] For example, in the process of measuring the tortuosity of the electrode, the electrode to be tested 100 is first placed on the conductive substrate 20, then the electrolyte 200 is injected into the receiving cavity 11, and then the detection component 30 is brought close to the electrode to be tested 100 so that the detection component 31, the electrode to be tested 100 and the electrolyte 200 form a first symmetrical battery structure.

[0090] Then, the electrochemical workstation 40 outputs an AC voltage and obtains the first impedance of the first symmetrical battery structure. The first impedance is used in conjunction with the second impedance of the detection element 31 to determine the third impedance of the electrode 100 under test. The third impedance is used to determine the tortuosity of the electrode 100 under test.

[0091] The third impedance can be obtained by subtracting the first impedance from the second impedance, or by subtracting the first impedance from the second impedance and then multiplying it by a preset coefficient. The preset coefficient is used to eliminate some errors caused by environmental factors during the measurement process. The specific value of the preset coefficient can be obtained from conventional experiments and selected according to the actual application environment, which will not be elaborated here.

[0092] It should be noted that the second impedance of the detection element 31 can be a known preset value, or it can be measured by a relevant device before the first symmetrical battery structure is constructed.

[0093] The tortuosity of the electrode 100 under test can be obtained by substituting the third impedance into a preset mapping relationship. For example, the preset mapping relationship can be as shown in formula (1).

[0094]

[0095] Where τ is the tortuosity of the electrode 100 under test, and R ion denoted as the third impedance of the electrode 100 under test, A is the surface area of ​​the electrode 100 under test, k is the conductivity, ε is the porosity of the electrode 100 under test, and d is the sum of the thicknesses of the detection element 31 and the electrode 100 under test.

[0096] The above technical solution pre-constructs a measuring device capable of measuring the tortuosity of an electrode. When the tortuosity of the electrode needs to be measured, simply install the electrode 100 to be tested onto the conductive substrate 20 and inject the electrolyte 200 to perform the tortuosity measurement. The operation is convenient and quick, consumes less time, and effectively improves the measurement efficiency of electrode tortuosity.

[0097] In some embodiments, the detection element 30 is configured to be movable relative to the conductive substrate 20.

[0098] For example, the detection component 30 can move vertically relative to the conductive substrate 20, or it can move in a direction parallel to the horizontal plane relative to the conductive substrate 20.

[0099] In some examples, the probe component 30 can be moved manually by an operator.

[0100] For example, a test electrode 100 with a large area can be used, and the area of ​​the detection element 31 is smaller than that of the test electrode 100. The test electrode 100 can be divided into multiple measurement areas. For ease of description, the multiple measurement areas are referred to as the first measurement area, the second measurement area, ... the Nth measurement area.

[0101] During the tortuosity measurement of the electrode, the probe component 30 is moved so that the detector 31 mates with the first measurement area of ​​the electrode 100 under test to form a first symmetrical cell structure. Then, the electrochemical workstation 40 outputs an AC voltage and obtains the first impedance of the first symmetrical cell structure, thereby measuring the tortuosity of the first measurement area of ​​the electrode 100 under test.

[0102] Next, the probe component 30 can be moved to align the probe component 31 with the second measurement region of the electrode under test 100 to form a second first symmetrical cell structure. Then, the electrochemical workstation 40 outputs an AC voltage and acquires the first impedance of the second first symmetrical cell structure, thereby measuring the tortuosity of the second measurement region of the electrode under test 100.

[0103] Similarly, using the above steps, the tortuosity of N measurement areas of the electrode 100 under test can be measured after one installation of the electrode 100 and injection of the electrolyte 200. This improves the precision of electrode tortuosity measurement, allows for the assessment of tortuosity differences in different areas of the electrode 100 under test, and thus helps to more accurately determine the performance parameters of the electrode 100 under test.

[0104] It should be noted that in the traditional method of constructing a symmetrical cell to measure the tortuosity of the electrode, only the tortuosity of the entire electrode in the symmetrical cell can be measured when constructing a symmetrical cell once. It is not possible to measure different regions of the electrode in the symmetrical cell separately. Therefore, it is not possible to perform a detailed analysis of the performance parameters of the electrode 100 under test.

[0105] Furthermore, in the traditional method of constructing symmetrical cells to measure the tortuosity of electrode sheets, if a detailed analysis of the performance parameters of the electrode sheet 100 under test is desired, the electrode sheet 100 under test needs to be divided into multiple sub-electrodes 100 under test, and multiple symmetrical cells need to be constructed from the multiple sub-electrodes 100 under test for measurement. This undoubtedly adds a huge amount of workload, incurs a high time cost, and results in extremely low measurement efficiency.

[0106] Thus, by configuring the probe 30 to be movable relative to the conductive substrate 20, the above technical solution can improve the measurable range of the probe 30, enabling the probe 30 to measure the tortuosity of different regions of the electrode 100 to be tested, thereby effectively improving the measurement accuracy and efficiency of the electrode tortuosity.

[0107] In some embodiments, the bottom of the housing 10 is provided with a fixing groove or magnetic adsorption device for mounting the conductive substrate 20, so as to keep the conductive substrate 20 in a stable position.

[0108] In some embodiments, the measuring device includes a drive unit 50, which is connected to the detection component 30 and is used to drive the detection component 30 to move.

[0109] For example, the drive device 50 can adopt various mechanical drive forms, including but not limited to robotic arms, electric slide rails, servo motors, telescopic rod structures, slide rail slider structures, lead screw structures, and electric cylinder structures.

[0110] The detection component 30 can be detachably connected to the drive device 50, or it can be integrally mounted on the drive device 50. The detection component 30 can be directly connected to the drive device 50, or it can be constrained to the drive device 50 by other components.

[0111] The above technical solution improves the automation level of the measuring equipment by introducing a driving device 50 to drive the movement of the detection component 30.

[0112] In some embodiments, the measuring device further includes a force control device 60, which is connected between the drive device 50 and the probe 30. The force control device 60 is used to control the pressure applied by the probe 30 to the electrode 100 under test to be maintained within a preset range.

[0113] For example, the force control device 60 may include a force sensor and a controller. The force sensor is used to acquire the pressure signal applied by the detection component 30 to the electrode 100 under test and send the pressure signal to the controller. The controller controls the operation of the drive device 50 according to the pressure signal to keep the pressure applied by the detection component 30 to the electrode 100 under test within a preset range.

[0114] As an example, the pressure applied by the detection component 30 to the electrode 100 under test can be in the range of 0.35 MPa to 1.5 MPa.

[0115] The above technical solution, by introducing a force control device 60, can maintain the pressure applied by the probe 30 to the electrode 100 under test within a preset range, significantly reducing measurement errors caused by pressure fluctuations during the measurement process. Furthermore, it can also, to a certain extent, prevent damage to the electrode 100 under test due to excessive pressure applied by the probe 30, or affect the measurement results due to insufficient pressure applied by the probe 30.

[0116] In some embodiments, the measuring device further includes a buffer component 70 connected between the drive device 50 and the probe component 30, and the buffer component 70 is configured to undergo elastic deformation under external force.

[0117] The buffer component 70 can effectively absorb the external force impact generated during the movement of the drive device 50, avoiding uneven pressure applied to the electrode 100 by the probe component 30 due to mechanical vibration or torque fluctuations, thereby significantly improving the stability of the measurement process. In addition, since the buffer component 70 can alleviate pressure fluctuations through elastic deformation, the probe component 30 can make more stable contact with the electrode 100, thereby reducing errors caused by sudden pressure changes during the measurement process.

[0118] Optionally, the buffer component 70 may be, but is not limited to, a spring, leaf spring, or rubber component.

[0119] In some embodiments, the buffer member 70 is connected between the force control device 60 and the detection member 30.

[0120] In some embodiments, the housing 10 includes a housing body 12 and a movable part 13. The movable part 13 is movably connected to the housing body 12 and is configured to move relative to the housing body 12 along a first direction X. The movable part 13 is disposed opposite to the conductive substrate 20 along a second direction Y. A detection member 30 is movably connected to the movable part 13 and is configured to move relative to the movable part 13 along the second direction Y, where the first direction X intersects the second direction Y.

[0121] The housing body 12 is the fixed part of the measuring equipment, and its main function is to provide stable support for the moving part 13, the detection component 30, and the conductive substrate 20. The housing body 12 can be made of corrosion-resistant materials (such as polytetrafluoroethylene, aluminum alloy, or stainless steel) and designed as a semi-enclosed structure.

[0122] The movable part 13 is movably connected to the box body 12 and is capable of moving relative to the box body 12 along a first direction X. As an example, the movable part 13 can be connected to the box body 12 via a slide rail, hinge, or guide groove.

[0123] In some examples, the material of the active part 13 is typically a high-strength, lightweight material (such as aluminum alloy or engineering plastic) to reduce the overall weight of the equipment and improve operational efficiency.

[0124] As an example, the first direction X is parallel to the horizontal plane, and the second direction Y is perpendicular to the horizontal plane. Any direction parallel to the horizontal plane is within the range of the second direction Y.

[0125] The movable part 13 can be detachably connected to the box body 12, or it can be integrally mounted on the box body 12. The movable part 13 can be directly connected to the box body 12, or it can be restricted to the box body 12 by other components.

[0126] The above technical solution enables multi-directional movement of the detection component 30 while maintaining a closed environment within the housing 10, reducing the influence of the external environment on the measurement during the movement of the detection component 30 and improving measurement accuracy. Furthermore, the above-mentioned structure is simple, reducing the overall complexity of the measuring equipment and helping to lower manufacturing costs.

[0127] In some embodiments, the movable part 13 is sealed to the housing body 12. As an example, a seal is provided at the connection between the movable part 13 and the housing body 12 so that the receiving cavity 11 can remain sealed during the movement of the movable part 13.

[0128] In some embodiments, the detection component 30 is sealed to the movable part 13. As an example, a seal is provided at the connection between the detection component 30 and the movable part 13 so that the receiving cavity 11 can remain sealed during the movement of the detection component 30.

[0129] In some embodiments, the housing body 12 includes a first housing portion 121 and a second housing portion 122, which are disposed opposite to each other along a second direction Y and cover each other. The first housing portion 121 and the second housing portion 122 are detachably connected, and together define a receiving cavity 11. A conductive substrate 20 is connected to the first housing portion 121, and a movable portion 13 is connected to the second housing portion 122.

[0130] For example, the second box portion 122 can be a hollow structure with one end open, and the first box portion 121 is a plate-like structure. The first box portion 121 covers the open side of the second box portion 122 to form a box body 10 with a receiving cavity 11. Both the first box portion 121 and the second box portion 122 can also be hollow structures with one side open, with the open side of the first box portion 121 covering the open side of the second box portion 122 to form a box body 10 with a receiving cavity 11. Of course, the first box portion 121 and the second box portion 122 can be of various shapes, such as cylinders, cuboids, etc.

[0131] In some examples, to improve the sealing performance after the first housing 121 and the second housing 122 are connected, a sealing element, such as sealant or sealing ring, may also be provided between the first housing 121 and the second housing 122.

[0132] The above technical solution, through the detachable configuration of the first housing 121 and the second housing 122, can improve the overall ease of use and maintenance of the measuring equipment and reduce the cost of component replacement and maintenance of the measuring equipment.

[0133] In some embodiments, a calibration element 21 is provided on the conductive substrate 20. The calibration element 21 has a preset impedance and is used to construct a second symmetrical battery structure in conjunction with the detection element 31 and the electrolyte 200. The electrochemical workstation 40 is also used to obtain a fourth impedance of the second symmetrical battery structure, which is used to determine the second impedance in conjunction with the preset impedance.

[0134] The preset impedance of the calibration element 21 is a known value. As an example, the conductive substrate 20 has a calibration area, and the calibration element 21 is disposed in the calibration area. The calibration element 21 can be directly connected to the conductive substrate 20, or it can be constrained to the conductive substrate 20 by other components.

[0135] For example, in the process of measuring the tortuosity of an electrode, the electrode to be tested 100 can be first placed on a conductive substrate 20, and then an electrolyte 200 can be injected into the receiving cavity 11. First, the detection component 30 is brought close to the calibration component 21 so that the detection component 31, the calibration component 21, and the electrolyte 200 form a second symmetrical battery structure. The electrochemical workstation 40 outputs an AC voltage to the detection component 31 and the calibration component 21 and obtains the fourth impedance of the second symmetrical battery structure. The second impedance of the detection component 31 is determined by using the fourth impedance in conjunction with the preset impedance of the calibration component 21.

[0136] The second impedance can be obtained by subtracting the fourth impedance from the preset impedance, or by subtracting the fourth impedance from the preset impedance and then multiplying it by a preset coefficient. The preset coefficient is used to eliminate some errors caused by environmental factors during the measurement process. The specific value of the preset coefficient can be obtained from conventional experiments and selected according to the actual application environment, which will not be elaborated here.

[0137] Then, the probe 30 is brought close to the electrode 100 under test, so that the probe 31, the electrode 100 under test, and the electrolyte 200 form a first symmetrical battery structure. The electrochemical workstation 40 outputs an AC voltage and obtains the first impedance of the first symmetrical battery structure. The first impedance is used in conjunction with the second impedance of the probe 31 to determine the third impedance of the electrode 100 under test. The third impedance is used to determine the tortuosity of the electrode 100 under test.

[0138] The third impedance can be obtained by subtracting the first impedance from the second impedance, or by subtracting the first impedance from the second impedance and then multiplying it by a preset coefficient. The preset coefficient is used to eliminate some errors caused by environmental factors during the measurement process. The specific value of the preset coefficient can be obtained from conventional experiments and selected according to the actual application environment, which will not be elaborated here.

[0139] Finally, the third impedance is substituted into the preset mapping relationship to obtain the tortuosity of the electrode 100 under test. An example of the preset mapping relationship has been given above and will not be repeated here.

[0140] Before measuring the tortuosity of the electrode 100 under test, the above technical solution first calibrates the second impedance of the detection element 31 through the calibration element 21 to improve the accuracy of the second impedance of the detection element 31, thereby reducing the measurement error of the tortuosity of the electrode 100 under test and improving the measurement accuracy of the tortuosity of the electrode.

[0141] In some embodiments, the detection component 30 includes a connector 32 and a probe 33. The connector 32 is connected to the housing 10, and the probe 33 is connected to one end of the connector 32 and located within the receiving cavity 11. The probe 33 is detachably connected to the connector 32. The detection component 31 is connected to the end of the probe 33 away from the connector 32.

[0142] For example, the probe 33 and the connector 32 can be detached by bolt connection, or they can be detached by snap-fit ​​connection, or they can be detached by plug-in connection.

[0143] By using the detachable connection between the probe 33 and the connector 32, when the detection element 31 needs to be replaced, it is only necessary to remove the probe 33 from the connector 32 and then install a probe 33 equipped with the new detection element 31 onto the connector 32, without having to remove the entire detection component 30 from the housing 10. Thus, the above technical solution effectively improves the ease of replacing the detection element 31, reduces time costs, and further improves measurement efficiency.

[0144] In some embodiments, the detection element 31 is detachably connected to the probe 33. When the detection element 31 needs to be replaced, it can be simply removed from the probe 33, thereby further reducing the replacement cost of the detection element 31.

[0145] In some embodiments, the connector 32 includes a first fixing portion 321 and a first conductive portion 322, with the first conductive portion 322 connected to the first fixing portion 321. The probe 33 includes a second fixing portion 331 and a second conductive portion 332, with the second conductive portion 332 connected to the second fixing portion 331. The first fixing portion 321 and the second fixing portion 331 are detachably connected, and the first conductive portion 322 abuts against the second conductive portion 332. The detection element 31 is connected to the end of the second conductive portion 332 away from the first conductive portion 322. The electrochemical workstation 40 is electrically connected to the first conductive portion 322.

[0146] The first conductive part 322 and the second conductive part 332 mainly function to conduct electricity, and are used to conduct the voltage output by the electrochemical workstation 40 to the detection element 31. The first fixing part 321 and the second fixing part 331 are mainly used to realize the connection between the connector 32 and the probe 33.

[0147] The first conductive part 322 can be detachably connected to the first fixing part 321, or it can be integrally disposed on the first fixing part 321. The first conductive part 322 can be directly connected to the first fixing part 321, or it can be constrained to the first fixing part 321 by other components.

[0148] In some examples, the first conductive part 322 is inserted inside the first fixing part 321, and the first fixing part 321 can provide a certain degree of protection for the first conductive part 322 to reduce the influence of the external environment on the first conductive part 322.

[0149] The second conductive part 332 can be detachably connected to the second fixing part 331, or it can be integrally disposed on the second fixing part 331. The second conductive part 332 can be directly connected to the second fixing part 331, or it can be constrained to the second fixing part 331 by other components.

[0150] In some examples, the second conductive part 332 is inserted inside the second fixing part 331, and the second fixing part 331 can provide a certain degree of protection for the second conductive part 332 to reduce the influence of the external environment on the second conductive part 332.

[0151] The detection component 30 of the above technical solution has a simple and reliable structure, which helps to reduce the overall structural complexity of the measurement setup and reduce costs.

[0152] In some embodiments, the first conductive portion 322 includes a main body portion 3221 and an abutment portion 3222. The abutment portion 3222 is connected to one end of the main body portion 3221 facing the second conductive portion 332 and is used to abut against the second conductive portion 332. The abutment portion 3222 is configured to undergo elastic deformation under external force. When the abutment portion 3222 abuts against the second conductive portion 332, the abutment portion 3222 is in a compressed state.

[0153] When the contact portion 3222 comes into contact with the second conductive portion 332, it enters a compressed state. The main function of this compressed state is to absorb mechanical vibration or external impact through elastic deformation, avoiding the risk of electrical connection breakage due to contact gaps, and improving the reliability of the electrical connection between the first conductive portion 322 and the second conductive portion 332. At the same time, the compression deformation can provide constant contact pressure, reducing the problem of increased resistance or unstable electrical signal transmission caused by insufficient contact pressure.

[0154] Optionally, the contact part 3222 may be, but is not limited to, a spring or leaf spring made of wire material.

[0155] In some embodiments, the first conductive part 322 includes a first body and a first plating layer, the first plating layer being disposed on the outer surface of the first body, and the corrosion resistance of the first plating layer being higher than that of the first body.

[0156] The primary function of the first body is to provide mechanical support and basic electrical conductivity. The first plating layer covers the outer surface of the first body and its primary function is to improve the corrosion resistance of the first conductive part 322.

[0157] As an example, the first coating may be attached to the outer surface of the first body by processes such as electroplating, electroless plating, or physical vapor deposition.

[0158] Optionally, the first plating layer can be, but is not limited to, gold or silver. As an example, the first plating layer is a gold plating layer.

[0159] The above technical solution can effectively improve the corrosion resistance of the first conductive part 322 by introducing the first coating layer, so that the first conductive part 322 can maintain stability in corrosive environments such as electrolyte 200 for a long time and improve the service life of the detection component 30.

[0160] In some embodiments, the second conductive portion 332 includes a second body and a second plating layer, the second plating layer being disposed on the outer surface of the second body, and the corrosion resistance of the second plating layer being higher than that of the second body.

[0161] The main function of the second body is to provide mechanical support and basic electrical conductivity. The second coating covers the outer surface of the second body and its main function is to improve the corrosion resistance of the first conductive part 322.

[0162] As an example, the second coating may be attached to the outer surface of the second body by processes such as electroplating, electroless plating, or physical vapor deposition.

[0163] Optionally, the second plating layer can be, but is not limited to, gold or silver. As an example, the second plating layer is a gold plating layer.

[0164] The above technical solution can effectively improve the corrosion resistance of the first conductive part 322 by introducing a second coating, so that the first conductive part 322 can maintain stability in corrosive environments such as electrolyte 200 for a long time and improve the service life of the detection component 30.

[0165] In some embodiments, the measuring device further includes a temperature control device 81, which is connected to the housing 10 and is used to control the temperature inside the housing 10 to remain within a preset range.

[0166] For example, the temperature control device 81 can be located inside or outside the enclosure 10. The temperature control device 81 may include a heating element, a cooling element, a temperature sensor, and a controller.

[0167] The heating element provides heat when the temperature inside the enclosure 10 is below a preset range, ensuring that the temperature inside the enclosure 10 reaches the desired value. As an example, the heating element can be a resistance heating element, such as a heating wire, or an infrared heater for rapid heating.

[0168] The cooling component is used to reduce the temperature inside the enclosure 10 when the temperature inside the enclosure 10 exceeds a preset range. As an example, the cooling component may employ a semiconductor cooling chip or a refrigerant circulation system.

[0169] A temperature sensor is used to monitor temperature changes within the enclosure 10 in real time and feeds the detected temperature data back to the controller. The controller receives the temperature data and controls the heating or cooling components to operate. For example, the temperature sensor can be a thermocouple, a thermistor, or an integrated digital temperature sensor. The controller can typically be a microprocessor or an embedded control chip.

[0170] As an example, the temperature control device 81 can control the temperature inside the enclosure 10 to be within the range of -20℃ to 50℃.

[0171] The above technical solution introduces a temperature control device 81 to control the temperature inside the chamber 10 and maintain it within a preset range. This improves the stability of the ambient temperature during the measurement process, reduces the impact of temperature fluctuations on the measurement results, and thus enhances the measurement accuracy and reliability of the measuring equipment.

[0172] In some embodiments, the measuring device further includes a gas exchange device 82, which is connected to the receiving cavity 11 and is used to evacuate the receiving cavity 11 or to introduce protective gas into the receiving cavity 11.

[0173] The main function of the gas exchange device 82 is to regulate the gas environment within the containment cavity 11 by evacuating or introducing protective gas, thereby providing suitable environmental conditions for measuring the tortuosity of the electrode and improving the stability and accuracy of the measurement results. As an example, before injecting electrolyte 200 into the containment cavity 11, the gas exchange device 82 is used to evacuate the cavity 11, followed by the injection of protective gas, and then the injection of electrolyte 200.

[0174] Exemplarily, the gas exchange device 82 may include a vacuum pump, a protective gas supply component, and gas lines. The vacuum pump is used to evacuate the gas within the containment chamber 11, removing air or other impurity gases from the chamber. As an example, the vacuum pump may be a rotary vane vacuum pump, a turbomolecular pump, or a dry vacuum pump, etc.

[0175] The protective gas supply unit is used to introduce a protective gas, such as nitrogen, argon, or other inert gas, into the receiving cavity 11. The protective gas can be supplied through a gas cylinder or a gas generator, and the input amount can be precisely regulated by a flow control valve.

[0176] The gas exchange device 82 is connected to the receiving cavity 11 via a gas pipeline. The gas pipeline is generally made of corrosion-resistant materials (such as stainless steel or polytetrafluoroethylene) and equipped with a sealing joint to prevent gas leakage.

[0177] In some examples, the gas exchange device 82 may also include a control valve for switching the operating status of the vacuum pump and the protective gas supply components. As an example, the control valve may be a solenoid valve or a manual valve, depending on the level of automation of the equipment.

[0178] In some examples, the gas exchange device 82 may also include a gas sensor for real-time monitoring of the gas composition and pressure within the containment cavity 11.

[0179] The above technical solution, by introducing a gas exchange device 82, can create a specific gas environment in the containment cavity 11 according to the test requirements, effectively reducing the interference of oxygen or moisture on the measurement process and improving the accuracy of the measurement.

[0180] In some embodiments, the measuring device further includes a liquid exchange device 83, which is connected to the receiving cavity 11 and is used to inject electrolyte 200 into the receiving cavity 11 or to drain electrolyte 200 from the receiving cavity 11.

[0181] The main function of the liquid exchange device 83 is to inject electrolyte 200 into the receiving cavity 11 or to drain electrolyte 200 from the cavity. By setting up the liquid exchange device 83, the automated management of electrolyte 200 can be realized, improving the operating efficiency of the measuring equipment and the convenience of liquid replacement, while reducing errors caused by human operation.

[0182] Exemplarily, the liquid exchange device 83 may include a liquid supply component and a drain component. The liquid supply component is used to inject electrolyte 200 into the receiving cavity 11. The liquid supply component may include a liquid storage container and an infusion pump. The liquid storage container may be a sealed container containing electrolyte 200. The infusion pump is connected to the liquid storage container and the receiving cavity 11 for delivering electrolyte 200. The infusion pump may be, but is not limited to, a peristaltic pump, a diaphragm pump, or a pneumatic pump.

[0183] The draining component is used to drain the electrolyte 200 from the receiving cavity 11. The draining component includes a draining pipeline and a draining pump. The draining pump can be, but is not limited to, a peristaltic pump, a diaphragm pump, or a pneumatic pump.

[0184] In some examples, the liquid exchange device 83 may also include a flow control valve for precisely regulating the injection or discharge rate of the liquid. The flow control valve may be, but is not limited to, a mechanical valve or a solenoid valve.

[0185] In some examples, the measuring device may also include a level sensor for real-time monitoring of the electrolyte 200 level within the containment cavity 11 to prevent overfilling or incomplete emptying. The level sensor may be, but is not limited to, an ultrasonic sensor, a capacitive sensor, or a float-type level gauge.

[0186] The above technical solution, by introducing a liquid exchange device 83, enables the automated injection and discharge of electrolyte 200, reduces manual operation steps, significantly improves the operating efficiency of the measuring equipment, and enhances measurement efficiency.

[0187] In some embodiments, the measuring device further includes a cleaning device 84, which is disposed adjacent to the housing 10 and is used to clean the detection component 30.

[0188] After completing the tortuosity measurement of the electrode, the detection component 30 can be cleaned using the cleaning device 84 to remove residual electrolyte 200, sample particles or other contaminants from the surface of the detection component 30, thereby maintaining the reusability of the measuring equipment and the accuracy of the test results.

[0189] In some examples, the cleaning device 84 may include a cleaning tank for containing cleaning fluid or cleaning medium.

[0190] In some examples, the cleaning device 84 may also include a waste liquid collection component for collecting waste liquid generated during the cleaning process to reduce environmental pollution.

[0191] In some examples, the cleaning device 84 may also include auxiliary components, such as an ultrasonic generator or an airflow drying device, to enhance the cleaning effect or quickly dry the detection component 30.

[0192] The above technical solution, by introducing a cleaning device 84, can quickly and efficiently remove contaminants from the surface of the probe component 30, thereby maintaining the reusability of the measuring equipment and the accuracy of the test results.

[0193] In some embodiments, the detection component 30 can be moved to the cleaning device 84 by the drive device 50. After the controller receives the arrival signal from the drive device 50, it controls the cleaning device 84 to automatically clean the detection component 30. This can reduce manual intervention, improve the automation level of the measuring equipment, and further improve the ease of use and operating efficiency of the measuring equipment.

[0194] According to some embodiments of this application, this application also provides a battery production system, which includes the measuring equipment of any of the above schemes.

[0195] To better understand the measuring device provided in the embodiments of this application, based on the same inventive concept, the above description of embodiments of the measuring device in practical applications is provided herein.

[0196] This application provides a measuring device, which includes a housing 10, a conductive substrate 20, a detection component 30, an electrochemical workstation 40, a drive device 50, a force control device 60, a buffer component 70, a temperature control device 81, a gas exchange device 82, a liquid exchange device 83, and a cleaning device 84.

[0197] The housing 10 has a receiving cavity 11 for containing electrolyte 200. A conductive substrate 20 is disposed within the receiving cavity 11 and is used to mount the electrode 100 to be tested. A detection component 30 is configured to be movable relative to the conductive substrate 20. A detection element 31 is disposed at one end of the detection component 30 facing the conductive substrate 20. The detection element 31 is used to cooperate with the electrode 100 to be tested and the electrolyte 200 to construct a first symmetrical battery structure. An electrochemical workstation 40 is electrically connected to the detection element 31 and the conductive substrate 20. The electrochemical workstation 40 is used to output voltage and obtain the first impedance of the first symmetrical battery structure. The first impedance is used to determine the third impedance of the electrode 100 to be tested in conjunction with the second impedance of the detection element 31. The third impedance is used to determine the tortuosity of the electrode 100 to be tested.

[0198] A calibration element 21 is provided on the conductive substrate 20. The calibration element 21 has a preset impedance and is used to construct a second symmetrical battery structure in conjunction with the detection element 31 and the electrolyte 200. The electrochemical workstation 40 is also used to obtain a fourth impedance of the second symmetrical battery structure, which is used to determine the second impedance in conjunction with the preset impedance.

[0199] A drive unit 50 is connected to the detection unit 30 and is used to drive the detection unit 30 to move. A force control unit 60 is connected between the drive unit 50 and the detection unit 30, and is used to control the pressure applied by the detection unit 30 to the electrode 100 under test to maintain it within a preset range. A buffer unit 70 is connected between the drive unit 50 and the detection unit 30, and is configured to undergo elastic deformation under external force.

[0200] The housing 10 includes a main body 12 and a movable part 13. The movable part 13 is movably connected to the main body 12 and is configured to move relative to the main body 12 along a first direction X. The movable part 13 and the conductive substrate 20 are disposed opposite each other along a second direction Y. A detection component 30 is movably connected to the movable part 13 and is configured to move relative to the movable part 13 along the second direction Y. The first direction X and the second direction Y intersect. The main body 12 includes a first housing section 121 and a second housing section 122. The first housing section 121 and the second housing section 122 are disposed opposite each other along the second direction Y and cover each other. The first housing section 121 and the second housing section 122 are detachably connected and together define a receiving cavity 11. The conductive substrate 20 is connected to the first housing section 121, and the movable part 13 is connected to the second housing section 122.

[0201] The detection component 30 includes a connector 32 and a probe 33. The connector 32 is connected to the housing 10, and the probe 33 is connected to one end of the connector 32 and located inside the receiving cavity 11. The probe 33 and the connector 32 are detachably connected. The detection component 31 is connected to the end of the probe 33 away from the connector 32.

[0202] The connector 32 includes a first fixing part 321 and a first conductive part 322, with the first conductive part 322 connected to the first fixing part 321. The probe 33 includes a second fixing part 331 and a second conductive part 332, with the second conductive part 332 connected to the second fixing part 331. The first fixing part 321 and the second fixing part 331 are detachably connected, and the first conductive part 322 abuts against the second conductive part 332. The detection element 31 is connected to the end of the second conductive part 332 away from the first conductive part 322. The electrochemical workstation 40 is electrically connected to the first conductive part 322.

[0203] The first conductive portion 322 includes a main body portion 3221 and an abutment portion 3222. The abutment portion 3222 is connected to the end of the main body portion 3221 facing the second conductive portion 332 and is used to abut against the second conductive portion 332. The abutment portion 3222 is configured to undergo elastic deformation under the action of external force. When the abutment portion 3222 abuts against the second conductive portion 332, the abutment portion 3222 is in a compressed state.

[0204] The first conductive part 322 includes a first body and a first plating layer. The first plating layer is disposed on the outer surface of the first body, and the corrosion resistance of the first plating layer is higher than that of the first body. The second conductive part 332 includes a second body and a second plating layer. The second plating layer is disposed on the outer surface of the second body, and the corrosion resistance of the second plating layer is higher than that of the second body.

[0205] A temperature control device 81 is connected to the housing 10 and is used to control the temperature inside the housing 10 to maintain it within a preset range. A gas exchange device 82 is connected to the receiving cavity 11 and is used to evacuate the receiving cavity 11 or to introduce protective gas into the receiving cavity 11. A liquid exchange device 83 is connected to the receiving cavity 11 and is used to inject electrolyte 200 into the receiving cavity 11 or to drain the electrolyte 200 from the receiving cavity 11. A cleaning device 84 is disposed adjacent to the housing 10 and is used to clean the detection component 30.

[0206] The above technical solution pre-constructs a measuring device for measuring the tortuosity of an electrode by employing a housing 10, a conductive substrate 20, a detection component 30, an electrochemical workstation 40, a drive device 50, a force control device 60, a buffer component 70, a temperature control device 81, a gas exchange device 82, a liquid exchange device 83, and a cleaning device 84. When the tortuosity of the electrode needs to be measured, simply install the electrode to be tested 100 onto the conductive substrate 20 and inject the electrolyte 200 to perform the tortuosity measurement. The operation is convenient and quick, with minimal time consumption, effectively improving the measurement efficiency of electrode tortuosity. Furthermore, by configuring the detection component 30 to be movable relative to the conductive substrate 20, the measurable range of the detection component 30 can be increased, allowing the detection component 30 to measure the tortuosity of different regions of the electrode to be tested 100 separately, effectively improving the measurement accuracy and efficiency of electrode tortuosity.

[0207] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A measuring device, characterized in that, include: The housing has a receiving cavity for containing electrolyte; A conductive substrate is disposed within the receiving cavity, and the conductive substrate is used to mount the electrode to be tested. The detection component has a detection element at one end facing the conductive substrate. The detection element is used to cooperate with the electrode under test and the electrolyte to construct a first symmetrical battery structure. An electrochemical workstation is electrically connected to the detection device and the conductive substrate. The electrochemical workstation is used to output voltage and obtain the first impedance of the first symmetrical battery structure. The first impedance is used in conjunction with the second impedance of the detection device to determine the third impedance of the electrode under test. The third impedance is used to determine the tortuosity of the electrode under test.

2. The measuring device according to claim 1, characterized in that, The detection element is configured to be movable relative to the conductive substrate.

3. The measuring device according to claim 2, characterized in that, The measuring device includes a driving device connected to the detection component and used to drive the detection component to move.

4. The measuring device according to claim 3, characterized in that, The measuring device also includes a force control device, which is connected between the driving device and the detection component. The force control device is used to control the pressure applied by the detection component to the electrode under test to remain within a preset range.

5. The measuring device according to claim 3, characterized in that, The measuring device further includes a buffer component connected between the driving device and the detection component, the buffer component being configured to undergo elastic deformation under external force.

6. The measuring device according to claim 2, characterized in that, The enclosure includes a main body and a movable part, the movable part being movably connected to the main body and configured to move relative to the main body in a first direction, the movable part being disposed opposite to the conductive substrate in a second direction; The detection component is movably connected to the movable part, and the detection component is configured to move relative to the movable part along the second direction, the first direction intersecting the second direction.

7. The measuring device according to claim 6, characterized in that, The main body of the box includes a first box section and a second box section, which are arranged opposite to each other along the second direction and cover each other. The first box section and the second box section are detachably connected, and the first box section and the second box section together define the receiving cavity. The conductive substrate is connected to the first housing section, and the movable part is connected to the second housing section.

8. The measuring device according to claim 1, characterized in that, The conductive substrate is provided with a calibration element, which has a preset impedance. The calibration element is used to cooperate with the detection element and the electrolyte to construct a second symmetrical battery structure. The electrochemical workstation is also used to obtain a fourth impedance of the second symmetrical battery structure, which is used in conjunction with the preset impedance to determine the second impedance.

9. The measuring device according to claim 1, characterized in that, The detection component includes a connector and a probe. The connector is connected to the housing, and the probe is connected to one end of the connector and located inside the receiving cavity. The probe and the connector are detachably connected. The detection element is connected to the end of the probe furthest from the connection element.

10. The measuring device according to claim 9, characterized in that, The connector includes a first fixing part and a first conductive part, wherein the first conductive part is connected to the first fixing part; The probe includes a second fixing part and a second conductive part, the second conductive part is connected to the second fixing part, the first fixing part and the second fixing part are detachably connected, the first conductive part abuts against the second conductive part, and the detection element is connected to the end of the second conductive part away from the first conductive part; The electrochemical workstation is electrically connected to the first conductive part.

11. The measuring device according to claim 10, characterized in that, The first conductive part includes a main body and an abutting part. The abutting part is connected to one end of the main body facing the second conductive part and is used to abut against the second conductive part. The abutting part is configured to undergo elastic deformation under the action of external force. When the abutting part abuts against the second conductive part, the abutting part is in a compressed state.

12. The measuring device according to claim 10, characterized in that, The first conductive part includes a first body and a first plating layer, the first plating layer being disposed on the outer surface of the first body, and the corrosion resistance of the first plating layer being higher than that of the first body; and / or, The second conductive part includes a second body and a second plating layer. The second plating layer is disposed on the outer surface of the second body, and the corrosion resistance of the second plating layer is higher than that of the second body.

13. The measuring device according to claim 1, characterized in that, The measuring device also includes a temperature control device connected to the chamber, which is used to control the temperature inside the chamber to remain within a preset range.

14. The measuring device according to claim 1, characterized in that, The measuring device also includes a gas exchange device connected to the containment cavity, which is used to evacuate the containment cavity or to input protective gas into the containment cavity.

15. The measuring device according to claim 1, characterized in that, The measuring device also includes a liquid exchange device connected to the receiving cavity, which is used to inject electrolyte into the receiving cavity or to drain electrolyte from the receiving cavity.

16. The measuring device according to any one of claims 1-15, characterized in that, The measuring device also includes a cleaning device, which is disposed adjacent to the housing and is used to clean the detection component.

17. A battery production system, characterized in that, Includes the measuring device as described in any one of claims 1-16.

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