Electrode-sheet measuring system and electrode-sheet measuring method

Abstract

An electrode-sheet measuring system (100) and an electrode-sheet measurement method. The electrode-sheet measuring system (100) comprises a base (10), a first conveyor (20), a support assembly (30), a generator (50), and a detector (60), wherein the first conveyor (20) is used for conveying an electrode sheet (220a) in a first direction (L1); the support assembly (30) is connected to the generator (50) and the detector (60), and is used for driving the generator (50) and the detector (60) to approach or move away from the electrode sheet (220a) in a second direction (L2); and the generator (50) has a projection port (51), the size of the projection port (51) in the first direction (L1) being larger than the size thereof in the second direction (L2), and the first direction (L1), the second direction (L2) and a third direction (L3) intersecting pairwise. The electrode-sheet measurement system (100) has a measurement state, in which the support assembly (30) drives the generator (50) and the detector (60) to reciprocate relative to the electrode sheet (220a) in the second direction (L2), and the generator (50) and the detector (60) are located on opposite sides of the electrode sheet (220a) in the third direction (L3), wherein the generator (50) emits rays through the projection port (51), and the detector (60) detects rays emitted by the generator (50) and obtains a radiation intensity measurement value.

Description

Pole piece measurement system and pole piece measurement method

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 202311279290.3, filed on September 28, 2023, entitled “Pole Piece Measurement System and Pole Piece Measurement Method,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the technical field of battery pole piece detection, and in particular to a pole piece measurement system and a pole piece measurement method. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] The production process of pole pieces includes two important processes: coating and drying. Coating refers to the process of applying anode active material or cathode active material to the surface of the foil. After coating, the substrate needs to be dried to facilitate subsequent production. After the pole piece is coated, its thickness is relatively thin at the edge, so that the coating area of ​​the pole piece is divided into a non-thinned area and a thinned area located on both sides of the non-thinned area. In order to detect whether the thickness and surface density of the thinned area meet the production requirements of lithium batteries, the thinned area will be tested after the pole piece is dried.

[0006] Generally, the thinned area of ​​the pole piece is inspected using a caliper or a laser. However, the existing measurement methods have poor measurement accuracy.

[0007] Summary of the Invention

[0008] Based on this, it is necessary to provide a pole piece measurement system and a pole piece measurement method that can achieve accurate measurement of pole piece thickness and surface density.

[0009] In the first aspect, the present application provides a pole piece measurement system for measuring the thickness of the pole piece. In some embodiments, the pole piece measurement system includes a base, a first conveyor, a support assembly, a generator and a detector, and the first conveyor is used to convey the pole piece along the first direction. The support assembly is connected to the generator and the detector, and is used to drive the generator and the detector to approach or move away from the pole piece along the second direction. The generator has a projection port, and the size of the projection port in the first direction is larger than the size in the second direction. The first direction, the second direction and the third direction intersect with each other. The pole piece measurement system has a measuring state. In the measuring state, the support assembly drives the generator and the detector to reciprocate relative to the pole piece along the second direction, and the generator and the detector are located on opposite sides of the pole piece in the third direction. The generator emits rays through the projection port, and the detector detects the rays emitted by the generator and obtains a radiation intensity measurement value.

[0010] In the technical solution of the embodiment of the present application, the electrode can be measured in a high-temperature environment. For example, the electrode measurement system can be set directly after the drying process of the electrode coating to achieve online measurement and improve measurement accuracy.

[0011] In some embodiments, the pole piece measurement system further includes a control module, which is electrically connected to the detector. The control module can calculate the thickness and surface density of the pole piece based on the radiation intensity measurement value.

[0012] In the technical solution of the embodiment of the present application, the control module obtains the radiation intensity measurement value obtained by the detector, and calculates the thickness of the pole piece at different positions in the width direction in real time, thereby realizing the detection of the thickness and surface density of the thinning area.

[0013] In some embodiments, the generator also includes a radiation source, and the projection ports include multiple projection ports, each of which has a size in the first direction larger than a size in the second direction, and the multiple projection ports have different sizes in the first direction and / or different sizes in the second direction. The generator is configured to be able to switch different projection ports relative to the radiation source in a third direction.

[0014] In the technical solution of the embodiment of the present application, projection ports with different sizes are provided to ensure the accuracy of thickness measurement of different areas on the electrode. When measuring the thinned area, the projection port with smaller size is opposite to the radiation source in the third direction, and the radiation source forms a narrower ray spot on the thinned area. When measuring the non-thinned area, the projection port with larger size is opposite to the radiation source in the third direction, and the radiation source forms a slightly wider ray spot on the non-thinned area, so as to improve the measurement accuracy.

[0015] In some embodiments, the generator includes a housing, a straightening member, and a third transmission member. The housing is connected to a support frame, and a radiation source is disposed within the housing. The straightening member is movably attached to a side of the housing, and all projection ports are defined in the straightening member. The third transmission member is in a transmission connection with the straightening member and drives the straightening member to rotate relative to the housing so that different projection ports are aligned with the radiation source.

[0016] In the technical solution of the embodiment of the present application, when the projection port needs to be switched, the third transmission member drives the straightening member to rotate relative to the circumference of the housing, thereby enabling reciprocating switching of multiple projection ports of different specifications.

[0017] In some embodiments, the support assembly includes a second conveying member and a support frame, the second conveying member is arranged on the base, the generator and the detector are arranged on the support frame at intervals along the third direction, and the second conveying member is used to drive the support frame to move along the second direction.

[0018] In the technical solution of the embodiment of the present application, the pole piece also enters the interior of the support frame through the opening at the open end, forming a "C"-shaped structure, which drives the movement of the generator and the detector while facilitating the reciprocating measurement of the pole piece.

[0019] In some embodiments, the support frame includes a first support arm and a second support arm, the first support arm and the second support arm are connected at one end in the second direction, and the other ends are opposite and spaced apart along the third direction, and the generator and the detector are respectively arranged at one end of the first support arm and the second support arm spaced apart.

[0020] In the technical solution of the embodiment of the present application, the generator and the detector are arranged at the open end of the support frame and are respectively connected to the first support arm and the second support arm, so that when the support frame approaches the first conveying member, the generator and the detector move to the opposite sides in the thickness direction of the pole piece.

[0021] In some embodiments, the second transmission member includes a power member, a guide rail and a slider. The guide rail is arranged on the base and along the second direction. The slider is connected to the support frame and is slidably connected to the guide rail. The power member is connected to the slider and is used to drive the slider to drive the support frame to slide along the guide rail.

[0022] In the technical solution of the embodiment of the present application, the movement of the support frame relative to the base is converted into the movement of the slider relative to the guide rail, which makes the driving of the support frame stable and highly reproducible.

[0023] In some embodiments, the first conveying member includes a first conveying roller and a second conveying roller, and the first conveying roller and the second conveying roller are arranged at intervals along the first direction to convey the pole piece. When the pole piece measurement system is in a measuring state, the generator is located between the first conveying roller and the second conveying roller in the first direction.

[0024] In the technical solution of the embodiments of the present application, when the pole piece measurement system is in a measurement state, the first conveyor conveys the pole piece in a first direction. At this time, the generator is located between the first conveyor roller and the second conveyor roller in the first direction and faces the pole piece therebetween in a third direction, so as to measure the width of the pole piece while the pole piece is being conveyed in the length direction. Similarly, the detector faces the generator in the third direction to receive radiation that has passed through the pole piece.

[0025] According to a second aspect of the present application, a pole piece measurement method is provided, comprising the following steps:

[0026] Controlling the first conveyor to convey the pole piece along a first direction;

[0027] The control support assembly drives the generator and the detector disposed opposite to and spaced apart from each other along the third direction to approach the pole piece along the second direction, until the generator and the detector are located on opposite sides of the pole piece in the third direction and reciprocate relative to the pole piece along the second direction;

[0028] The generator is controlled to emit radiation toward the pole piece through the projection port, and the size of the projection port in the first direction is larger than the size in the second direction.

[0029] The detector is controlled to detect the radiation emitted by the generator and obtain a radiation intensity measurement value.

[0030] The thickness and surface density of the pole piece are calculated based on the radiation intensity measurement value.

[0031] In the technical solution of the embodiment of the present application, accurate measurement of the thickness and surface density of the electrode can be achieved.

[0032] In some embodiments, the pole piece measurement method further comprises the following steps:

[0033] Control the generator to switch different projection ports relative to the radiation source of the generator in the third direction; wherein the generator also includes a radiation source, the projection ports include multiple, the size of each projection port in the first direction is larger than its own size in the second direction, and the sizes of the multiple projection ports in the first direction are different and / or the sizes in the second direction are different.

[0034] In the technical solution of the embodiment of the present application, the accuracy of measuring the thickness of different areas on the electrode is improved.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the drawings without inventive work. In the drawings:

[0037] FIG1 is an exploded view of a battery cell according to one or more embodiments of the present application;

[0038] FIG2 is a structural diagram of an electrode assembly according to one or more embodiments of the present application;

[0039] FIG3 is a schematic diagram of a partial structure of a pole piece provided in accordance with one or more embodiments of the present application;

[0040] FIG4 is an enlarged structural diagram of point A in FIG3 ;

[0041] FIG5 is a schematic diagram of a planar structure of a pole piece measurement system provided in accordance with one or more embodiments of the present application;

[0042] FIG6 is a schematic diagram of the three-dimensional structure of the pole piece measurement system provided in FIG5 ;

[0043] FIG7 is a schematic planar structural diagram of the pole piece measurement system provided in FIG1 from another perspective;

[0044] FIG8 is a schematic structural diagram of a generator of the pole piece measurement system provided in FIG1 ;

[0045] FIG9 is a flow chart of a pole piece measurement method provided in accordance with one or more embodiments of the present application.

[0046] 200, battery cell; 210, housing; 220, electrode assembly; 220a, electrode piece; 220a1, skived area; 220a2, coating area; 220a3, blank area; 2201, anode electrode piece; 2202, cathode electrode piece; 2203, diaphragm; 230, end cap;

[0047] 100. Pole piece measurement system; 10. Base; 20. First conveyor member; 21. First conveyor roller; 22. Second conveyor roller; 23. Third conveyor roller; 24. Fourth conveyor roller; 25. Bracket; 30. Support assembly; 31. Support frame; 311. First support arm; 312. Second support arm; 40. Second conveyor member; 41. Power member; 42. Guide rail; 43. Slider; 50. Generator; 50a. Ray spot; 51. Projection port; 52. Radiation source; 53. Housing; 54. Alignment member; 55. Third conveyor member; 56. Protective cover; 60. Detector; 70. Control module; 80. Display screen; L1. First direction; L2. Second direction; L3. Third direction. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] Solar cells, as green energy sources, are currently seeing increasing market adoption. They are not only used in photovoltaic power generation systems like solar power plants, but are also increasingly being incorporated into electrical devices like electric vehicles. As the application of solar cells continues to expand, market demand is also growing.

[0057] During the coating process of the battery's pole pieces (including anode pole pieces and cathode pole pieces), the coating on the edges of the pole pieces needs to be thinned to avoid subsequent problems such as thick edges and bulging edges. The thickness of the active coating in the thinned area is thinner than the coating thickness in other areas. The coating in the normal area is the non-thinned area. The non-thinned area may include the coating area, the blank area, etc. The coating area is the normal working area of ​​the pole piece, and the blank area can be used to form the pole piece's ears later.

[0058] A thinned area that is too thin or too thick will affect the safety performance of the battery. For example, when the thinned area is too thick, lithium deposition is likely to occur, and when the thinned area is too thin, bulging will occur. Therefore, after the electrode is dried, the thickness of the thinned area of ​​the electrode needs to be measured to control the thickness of the thinned area within an appropriate range.

[0059] Currently, the thinned area is usually measured using micrometer or laser measurement. The micrometer measurement method refers to mechanical measurement using a micrometer after the electrode is rolled off the production line. Although this measurement method is simple, it requires the electrode to be dried before it can be measured, that is, it needs to be manually operated until the drying heat is completely dissipated. It has poor accuracy and different techniques. It is also impossible to measure the electrode in a timely manner after drying, which is not timely. The laser measurement method refers to a method of measuring the thickness of the electrode after the electrode is dried by scanning the electrode back and forth with a laser sensor to illuminate a circular light spot on the electrode, and then transmitting it to the control system. However, laser measurement is greatly affected by temperature and the roughness of the electrode surface. For example, the laser cannot accurately measure in a high temperature environment where the drying heat has not completely dissipated, or when the laser is irradiated into the gap pits between the active material particles on the surface of the electrode, the thickness measured by the laser is less accurate. Moreover, since the thinned area is narrow in the width direction of the pole piece, the circular spot is projected on the thinned area, and the boundary is easily mapped on the non-thinned area, resulting in the thickness of the area sampled and measured by the circular spot not being the thickness of the thinned area.

[0060] Based on this, in order to solve the problem of inaccurate measurement of the thinning area of ​​the pole piece, the present application provides a pole piece measurement system, in which rays are emitted by a generator, and a detector obtains the radiation intensity measurement value of the rays after passing through the pole piece, so that the thickness of the pole piece in a high-temperature environment after drying can be obtained according to the radiation intensity measurement value. In addition, according to the narrow characteristics of the thinning area, a long strip projection port is provided to ensure that the rays are scanned and measured accurately multiple times in the thinning area. The pole piece measurement system can also be directly controlled with the equipment for drying the pole piece, thereby realizing online measurement.

[0061] The pole piece measurement system disclosed in the embodiment of the present application can be used to measure the thickness of the thinned area or non-thinned area on the pole piece, and can also be used to measure the surface density of the thinned area or non-thinned area on the substrate. The thickness and surface density of the same area have a certain relationship. The specific calculation method is shown below.

[0062] As shown in FIG1 , in some embodiments, a battery cell 200 includes a housing 210 , an end cap 230 , an electrode assembly 220 , and other functional components. The housing 210 is a component used to form an internal environment of the battery cell 200 , which can be used to accommodate the electrode assembly 220 , electrolyte, and other components. The end cap 230 is a component that covers the opening of the housing 210 to isolate the internal environment of the battery cell 200 from the external environment. The shape of the end cap 230 can be adapted to the shape of the housing 210 to match the housing 210 . The end cap 230 can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end cap 230 is less likely to deform when squeezed or collided, thereby providing the battery cell 200 with higher structural strength.

[0063] The electrode assembly 220 is a component in the battery cell 200 where the electrochemical reaction occurs. One or more electrode assemblies 220 may be contained in the housing 210. As shown in Figure 2, the wound electrode assembly 220 is mainly formed by winding an anode electrode sheet 2201 and a cathode electrode sheet 2202 on a winding needle 10, and a separator 2203 is usually provided between the anode electrode sheet 2201 and the cathode electrode sheet 2202. The parts of the anode electrode sheet 2201 and the cathode electrode sheet 2202 with active materials (such as the coating area mentioned above) constitute the main body of the electrode assembly 220, and the parts of the anode electrode sheet 2201 and the cathode electrode sheet 2202 without active materials (such as the blank area mentioned above) each constitute a tab. The anode tab and the cathode tab may be located together in one section of the main body or respectively in two sections of the main body. During the charge and discharge process of the battery, the anode active material and the cathode active material react with the electrolyte, and the tabs connect the electrode segments to form a current loop. It can be understood that in the above and below, the anode electrode sheet 2201 and the cathode electrode sheet 2202 are collectively referred to as electrodes for description.

[0064] According to some embodiments of the present application, referring to Figures 3 to 8, the present application provides a pole piece measurement system 100 for measuring the thickness of a pole piece 220a. In some embodiments, the pole piece measurement system 100 includes a base 10, a first conveyor 20, a support assembly 30, a generator 50, and a detector 60. The first conveyor 20 is used to convey the pole piece 220a along a first direction L1. The support assembly 30 is connected to the generator 50 and the detector 60 and is used to drive the generator 50 and the detector 60 toward or away from the pole piece along a second direction. The generator 50 has a projection port 51. The size of the projection port 51 in the first direction L1 is larger than the size in the second direction L2. The first direction L1, the second direction L2, and the third direction L3 intersect with each other.

[0065] In which, the pole piece measurement system 100 has a measuring state. In the measuring state, the support assembly 30 drives the generator 50 and the detector 60 to reciprocate relative to the pole piece along the second direction L2, and the generator 50 and the detector 60 are located on opposite sides of the pole piece 220a in the third direction L3. The generator 50 emits rays through the projection port 51, and the detector 60 detects the rays emitted by the generator 50 and obtains a radiation intensity measurement value.

[0066] The direction in which the first conveying member 20 conveys the electrode 220a is defined as the length direction of the electrode 220a. The first direction L1 is the length direction of the electrode 220a, the second direction L2 is the width direction of the electrode 220a, and the third direction L3 is perpendicular to the plane where the electrode 220a is located. The third direction L3 can be considered as the thickness direction of the electrode 220a.

[0067] The base 10 is a basic structure for supporting the first conveyor 20, the second conveyor 40, and the support assembly 30. It can be a bottom plate, a mounting frame, or other structures, and the specific configuration is not limited. The support assembly 30 is mounted on the base 10 and is capable of driving the generator 50 and the detector 60 to scan the electrode piece 220a back and forth along the width direction of the electrode piece 220a while the first conveyor 20 transports the electrode piece 220a along the length direction of the electrode piece 220a.

[0068] The first transmission member 20 is a power structure, which is used to provide power for the transmission of the pole piece 220a along the first direction L1. It can be understood that if it is necessary to switch the pole piece measurement system 100 to the measurement state, the support assembly 30 drives the generator 50 and the detector 60 along the second direction L2 to approach the pole piece 220a.

[0069] In some embodiments, when the pole piece measurement system 100 is in a measuring state, the first conveyor 20 conveys the pole piece 220a along the length direction of the pole piece 220a. At this time, the generator 50 and the detector 60 are located on opposite sides of the pole piece 220a along the thickness direction of the pole piece 220a, and move back and forth along the width direction of the pole piece 220a. During the movement, the generator 50 projects rays through the projection port 51 and forms a ray spot 50a on the pole piece 220a. At this time, the movement trajectory of the ray spot 50a is shown as the Z-shaped dotted line in Figure 3.

[0070] After the rays pass through the pole piece 220a, their intensity is attenuated to a certain extent. The detector 60 obtains the rays passing through the pole piece 220a and obtains a radiation intensity measurement value. In this way, the radiation attenuation can be obtained based on the radiation intensity setting value of the rays emitted by the generator 50 and the radiation intensity measurement value of the rays sensed by the detector 60, and the thickness of the pole piece 220a can be calculated.

[0071] In some embodiments, pole piece 220a is positioned between generator 50 and detector 60. Radiation emitted by generator 50 penetrates pole piece 220a and reaches detector 60. During the penetration process, the radiation is partially absorbed and reflected by pole piece 220a, and the radiation ultimately reaching detector 60 is weakened. The radiation may be, but is not limited to, X-rays or β-rays. The radiation intensity of the radiation emitted by generator 50 is fixed. Once the radiation intensity measurement is obtained, the thickness and surface density of pole piece 220a can be determined.

[0072] In some embodiments, the attenuation of the radiation intensity is in a negative exponential relationship with the thickness of the pole piece 220a, as expressed by: t is the thickness of the area on the pole piece 220a through which the ray passes, μ is the attenuation coefficient of the material absorbing the ray, which is related to the material of the pole piece 220a itself and is a fixed value, ρ is the density of the pole piece 220a, I0 is the radiation intensity measurement value obtained when the ray penetrates the air, that is, the radiation intensity of the linear ray emitted by the generator 50, which is a known fixed value, and I is the radiation intensity measurement value obtained by the detector 60 after penetrating the pole piece 220a. The detector 60 can obtain the I value of the ray after passing through the pole piece 220a and derive the t value according to the above formula.

[0073] It can be understood that when I is smaller, the radiation intensity loss of the rays is greater, and the thickness t of the pole piece 220a is thicker. When the I value is larger, the radiation intensity loss of the rays is smaller, and the thickness t of the pole piece 220a is thinner.

[0074] Similarly, the detector 60 can also obtain the I value of the ray after passing through the pole piece 220a and obtain the surface density, specifically: m is the surface density of the pole piece 220a (unit: g / cm2), and μ refers to the attenuation coefficient of the pole piece 220a absorbing radiation, which is related to the material of the pole piece 220a and is a fixed value.

[0075] The detector 60 obtains the I value, so that the thickness and surface density of the pole piece 220a can be calculated manually or by computer through the above-mentioned ray attenuation formula, and the radiation attenuation of the ray is not affected by the temperature of the pole piece 220a, thereby realizing the detection of the pole piece 220a in a high temperature environment.

[0076] In addition, the generator 50 projects a ray spot 50a having the same size as the projection port 51 through the projection port 51. Since the size of the projection port 51 in the first direction L1 is larger than the size in the second direction L2, the ray spot 50a appears in an elongated strip shape on the pole piece 220a, as shown in Figures 3 and 4, and is smaller along the width direction of the pole piece 220a and larger along the length direction of the pole piece 220a. As shown in Figures 3 and 4, the thinned areas 220a1 are generally arranged at intervals on both sides of the coating area 220a2 along the width direction of the pole piece 220a, and are smaller in the width direction of the pole piece 220a. Therefore, by adjusting the size of the projection port 51, the size of the ray spot 50a in the width direction of the pole piece 220a is also smaller. Therefore, when the support assembly 30 drives the generator 50 and the detector 60 to move, the generator 50 can perform multiple laser projections in the thinned area 220a1 along the width direction of the pole piece 220a, thereby taking measurements as many times as possible to improve measurement accuracy.

[0077] Furthermore, the energy of the ray spot 50a emitted by the long projection opening 51 is more concentrated, and the energy loss generated is smaller, thereby further improving the measurement accuracy.

[0078] Thus, the electrode measurement system 100 provided in the present application can measure the electrode 220a in a high temperature environment. For example, the electrode measurement system 100 can be set directly after the drying process of the electrode 220a coating to achieve online measurement and improve measurement accuracy.

[0079] In some embodiments, after the pole piece measurement system 100 measures and obtains the thickness of the thinned area 220a1, it can also be fed back to the coating process to adjust the coating process in real time to achieve controllable thickness of the thinned area 220a1.

[0080] According to some embodiments of the present application, for example, referring to FIG1 , the pole piece measurement system 100 further includes a control module 70 , which is electrically connected to the detector 60 , and the control module 70 can calculate the thickness and surface density of the pole piece 220 a based on the radiation intensity measurement value.

[0081] The above-mentioned formula for calculating thickness and surface density can be built into the input control module 70, and fixed parameters can be input. After the control module 70 obtains the radiation intensity measurement value transmitted by the generator 50, the photon signal is converted into an electrical signal, and the thickness and surface density are directly calculated in the control module 70, thereby realizing the simultaneous measurement of the thickness and surface density of the pole piece 220a.

[0082] It is understood that when the pole piece 220a is absent from the first conveyor 20, the radiation emitted by the generator 50 passes through the air directly to the detector 60. In this case, it can be assumed that no energy loss occurs in the radiation, and the radiation intensity measured by the detector is the radiation intensity of the radiation emitted by the generator 50. When the first conveyor 20 conveys the pole piece 220a, the generator 50 transmits radiation at a predetermined frequency. The control module 70 receives the radiation transmitted by the detector 60 and calculates the thickness and surface density of the pole piece 220a at different locations along the width direction in real time based on the radiation loss, thereby enabling detection of the thickness and surface density of the thinned area 220a1.

[0083] According to some embodiments of the present application, for example, referring to Figure 8, the generator 50 also includes a radiation source 52, and the projection port 51 includes multiple projection ports 51, the size of each projection port 51 in the first direction L1 is larger than the size in the second direction L2, and the sizes of the multiple projection ports 51 in the first direction L1 and / or the sizes in the second direction L2 are different, and the generator 50 is configured to be able to switch different projection ports 51 to be opposite to the radiation source 52 in the third direction L3.

[0084] 3 to 4 , when the support assembly 30 moves along the second direction L2, the rays can not only pass through the thinned area 220a1 to measure the thickness of the thinned area 220a1, but can also pass through the non-thinned area to measure the thickness of the non-thinned area. The width of the non-thinned area in the second direction L2 is larger. If the same projection port 51 as that of the thinned area 220a1 is still used, the sampling size of the projection spot of each sampling on the thinned area 220a1 is more appropriate. However, if the sampling size on the non-thinned area is too small, it will cause sampling errors and require more sampling times, thereby reducing the measurement efficiency.

[0085] Referring to Figures 3 and 4, the non-thinning area includes but is not limited to the blank area 220a3 and the coating area 220a2. In order to ensure the accuracy of the thickness measurement of different areas on the electrode 220a, the multiple projection openings 51 have different sizes in the first direction L1 and / or different sizes in the second direction L2, and projection openings 51 with different size specifications are provided.

[0086] When measuring the thinned area 220a1, the projection port 51 with a smaller size specification is opposite to the radiation source 52 in the third direction L3, and the radiation source 52 forms a narrower ray spot 50a on the thinned area 220a1. When measuring the non-thinned area, the projection port 51 with a larger size specification is opposite to the radiation source 52 in the third direction L3, and the radiation source 52 forms a slightly wider ray spot 50a on the non-thinned area to improve measurement accuracy.

[0087] In a specific embodiment, the size specification of the projection port 51 of the thinning area 220a1 can be 1 mm (size in the second direction L2) * 60 mm (size in the first direction L1), and the size specification of the projection port 51 of the coating area 220a2 can be set to 10 mm (size in the second direction L2) * 40 mm (size in the first direction L1).

[0088] It can be understood that the thickness of the thinned area 220a1 is smaller than the thickness of the non-thinned area. Therefore, the radiation loss of the ray after passing through the non-thinned area is greater than the radiation loss of the ray through the thinned area 220a1. The detector 60 can identify the boundary between the thinned area 220a1 and the non-thinned area (the coating area 220a2 and the blank area 220a3) based on the sudden change in the radiation intensity of the ray after passing through the pole piece 220a, and can switch to different projection ports 51 in time after identifying the boundary.

[0089] According to some embodiments of the present application, for example, referring to Figures 6 to 8, a generator 50 includes a housing 53, a straightening member 54, and a third transmission member 55. The housing 53 is connected to the support assembly 30, and the radiation source 52 is disposed within the housing 53. The straightening member 54 is movably covered on one side of the housing 53, and all projection ports 51 are provided on the straightening member 54. The third transmission member 55 is in transmission connection with the straightening member 54 and drives the straightening member 54 to rotate relative to the housing 53 so that different projection ports 51 are opposite to the radiation source 52.

[0090] The housing 53 serves as the mounting base for the generator 50. A straightening member 54 is placed over one side of the housing 53, and a projection port 51 is defined therein. This ensures that radiation from the radiation source 52 within the housing 53 is projected only through the projection port 51 on the straightening member 54. When the projection port 51 needs to be switched, a third transmission member 55 drives the straightening member 54 in a circular rotation relative to the housing 53, enabling reciprocating switching between multiple projection ports 51 of varying sizes.

[0091] The straightening member 54 can be a cover structure. It can be understood that the straightening member 54 provides a straightening function for the radiation source 52 through the projection port 51, so that the rays projected by the radiation source 52 can be accurately projected along the axial direction of the projection port 51 (ie, the third direction L3).

[0092] In some embodiments, the radiation has a certain radiation intensity, so a protective sheath 56 such as a lead sheath structure can be provided around the radiation source 52 to isolate the radiation source 52 and reduce the radiation intensity of the generator 50 .

[0093] According to some embodiments of the present application, for example, referring to Figures 5 to 6, the support assembly includes a second conveying member 40 and a support frame 31, the second conveying member 40 is arranged on the base 10, the generator 50 and the detector 60 are arranged on the support frame 31 at intervals along the third direction L3, and the second conveying member 40 is used to drive the support frame 31 to move along the second direction L2.

[0094] The second transmission member 40 is a power structure, which is used to provide power for the transmission of the support frame 31 along the second direction L2. When the support frame 31 moves, the generator 50 and the detector 60 arranged on the support frame 31 along the third direction L3 move synchronously.

[0095] When the pole piece 220a is placed between the generator 50 and the detector 60, the pole piece 220a is not in contact with the interior of the support frame 31. In some embodiments, the support frame 31 has an open end at one end in the second direction L2, and the generator 50 and the detector 60 are spaced apart at the open end of the support frame 31 along the third direction L3. When the pole piece 220a is placed between the generator 50 and the detector 60, the pole piece 220a also enters the interior of the support frame 31 through the opening of the open end, forming a "C"-shaped structure, which drives the generator 50 and the detector 60 to move while facilitating the reciprocating measurement of the pole piece 220a.

[0096] According to some embodiments of the present application, for example, referring to Figures 5 to 6, the support frame 31 includes a first support arm 311 and a second support arm 312, the first support arm 311 and the second support arm 312 are connected at one end in the second direction L2, and the other ends are opposite and spaced apart along the third direction L3, and the generator 50 and the detector 60 are respectively arranged at one end of the first support arm 311 and the second support arm 312 spaced apart.

[0097] The support frame 31 has a connecting end and an open end at both ends in the second direction L2. On one side of the connecting end, the first support arm 311 and the second support arm 312 are connected. On one side of the open end, the first support arm 311 and the second support arm 312 are opposite and spaced apart along the third direction L3 to form an opening of the support frame 31.

[0098] The generator 50 and the detector 60 are arranged at the open end of the support frame 31 and are respectively connected to the first support arm 311 and the second support arm 312, so that when the support frame 31 approaches the pole piece 220a, the generator 50 and the detector 60 move to the opposite sides in the thickness direction of the pole piece 220a.

[0099] The first support arm 311 and the second support arm 312 can be of the same structure, and the two can be connected by later assembly or early integral molding. When the support frame 31 moves relative to the pole piece 220a, the pole piece 220a can enter between the first support arm 311 and the second support arm 312 through the opening at the open end.

[0100] According to some embodiments of the present application, for example, referring to Figure 5, the second conveying member 40 includes a power member 41, a guide rail 42 and a slider 43, the guide rail 42 is arranged on the base 10 and is arranged along the second direction L2, the slider 43 is connected to the support frame 31 and is slidably connected to the guide rail 42, the power member 41 is connected to the slider 43 and is used to drive the slider 43 to drive the support frame 31 to slide along the guide rail 42.

[0101] The power part 41 is a structure such as a motor, a driving cylinder, a servo motor, etc., which has a driving shaft directly connected to the slider 43. The power part 41 drives the slider 43 through the driving shaft, and the slider 43 drives the support frame 31 to move relative to the guide rail 42 along the extension direction of the guide rail 42, that is, the second direction L2, thereby realizing the reciprocating motion of the support frame 31 along the second direction L2.

[0102] The movement of the support frame 31 relative to the base 10 is converted into the movement of the slider 43 relative to the guide rail 42, which makes the driving of the support frame 31 stable and highly reproducible. It can be understood that the extreme position of the support frame 31 in the second direction L2 is the extreme position of the two ends that the slider 43 can reach on the guide rail 42.

[0103] The sliding fit between the slider 43 and the guide rail 42 can be achieved by providing a sliding groove on one of the guide rail 42 and the slider 43 and a sliding protrusion on the other in some embodiments, thereby achieving directional sliding of the slider 43 on the guide rail 42. In other embodiments, it can also be achieved in other ways, which are not limited in this application.

[0104] According to some embodiments of the present application, for example, the first conveying member 20 includes a first conveying roller 21 and a second conveying roller 22, and the first conveying roller 21 and the second conveying roller 22 are arranged on the base 10 at intervals along the first direction L1 for conveying the electrode 220a. When the electrode measurement system 100 is in a measuring state, the generator 50 is located between the first conveying roller 21 and the second conveying roller 22 in the first direction L1.

[0105] The first conveying member 20 further includes a bracket 25, which is disposed on the base 10. The first conveying roller 21 and the second conveying roller 22 are spaced apart on the bracket 25 along the first direction L1, and the first conveying roller 21 and the second conveying roller 22 can rotate relative to the bracket 25. When the first conveying roller 21 and the second conveying roller 22 rotate, the pole piece 220a is placed on the first conveying roller 21 and the second conveying roller 22 and is conveyed along the first direction L1.

[0106] When the electrode piece measurement system 100 is in the measurement state, the first conveyor 20 conveys the electrode piece 220a along the first direction L1. The generator 50 is positioned between the first conveyor roller 21 and the second conveyor roller 22 in the first direction L1, and faces the electrode piece 220a therebetween in the third direction L3. This allows for measurement along the width of the electrode piece 220a as the electrode piece 220a is conveyed along its length. Similarly, the detector 60 faces the generator 50 in the third direction L3 to receive radiation that has passed through the electrode piece 220a.

[0107] The first conveying member 20 may further include a third conveying roller 23 and a fourth conveying roller 24 , wherein the third conveying roller 23 is used to change the conveying height of the pole piece 220 a before it enters the first conveying roller 21 and the second conveying roller 22 , and the fourth conveying roller 24 is used to change the conveying height of the pole piece 220 a after it leaves the first conveying roller 21 and the second conveying roller 22 .

[0108] For example, when the base 10 is set on the ground, the pole piece 220a bypasses the third conveying roller 23 from a lower position, makes a ninety-degree bend and climbs up to the first conveying roller 21 to be lifted up, and then is conveyed along the first direction L1, lowers the height and bypasses the fourth conveying roller 24, and leaves the pole piece measurement system 100 from a lower position.

[0109] It can be understood that when the base 10 is set on the ground, the plane where the pole piece 220a is transported is located between the generator 50 and the detector 60, so as to ensure that when the support frame 31 moves along the second direction L2, the generator 50 and the detector 60 can move to the opposite sides of the thickness of the pole piece 220a.

[0110] According to some embodiments of the present application, for example, referring to FIG. 5 , the pole piece measurement system 100 further includes a display screen 80 , and the display screen 80 is electrically connected to the control module 70 .

[0111] The display screen 80 has a display area, through which the user can directly know the thickness and surface density of the electrode 220a calculated by the control module 70. In this way, it is convenient to provide feedback on the coating process of the electrode 220a based on the thickness of the electrode 220a, so as to make timely adjustments when the thickness of the thinning area 220a1 is unreasonable.

[0112] Based on the same concept, the present application also provides a pole piece measurement method, referring to FIG9 , which includes the following steps:

[0113] S10 , controlling the first conveying member 20 to convey the electrode piece 220 a along the first direction L1 .

[0114] In some embodiments, the first conveyor 20 is used to provide power for conveying the pole piece 220a along the first direction L1. When the thickness of the pole piece 220a needs to be measured, the first conveyor 20 is controlled to convey the pole piece 220a along the length direction of the pole piece 220a.

[0115] S20, control the support assembly 30 to drive the generator 50 and the detector 60 arranged opposite to and spaced apart along the third direction L3 to approach the pole piece 220a along the second direction L2, until the generator 50 and the detector 60 are located on opposite sides of 220a in the third direction L3 and reciprocate relative to the pole piece 220a along the second direction L2.

[0116] In some embodiments, when the first direction L1 is the length direction of the pole piece 220a, the second direction L2 is the width direction of the pole piece 220a, and the third direction L3 is perpendicular to the plane where the pole piece 220a is located, the third direction L3 can be considered as the thickness direction of the pole piece 220a.

[0117] The supporting assembly 30 includes a second conveying member 40 and a supporting frame 31 , and the specific configuration of the two has been described in detail above and will not be repeated here.

[0118] When the support frame 31 is conveyed from the side away from the first conveyor member 20 to the first conveyor member 20 until the generator 50 and the detector 60 are located on opposite sides of the pole piece 220a along the thickness direction of the pole piece 220a, at this time, the generator 50 is equivalent to performing a mobile scanning of the pole piece 220a along the width direction of the pole piece 220a. During the movement, the generator 50 projects rays through the projection port 51 and forms a ray spot 50a on the pole piece 220a. The trajectory of the formed ray spot 50a is shown as the Z-shaped dotted line in Figure 3.

[0119] S30 , controlling the generator 50 to emit radiation toward the pole piece 220 a through the projection port 51 , wherein the size of the projection port 51 in the first direction L1 is larger than the size in the second direction L2 .

[0120] S40 , controlling the detector 60 to detect the radiation emitted by the generator 50 and obtain a radiation intensity measurement value.

[0121] S50 , calculating the thickness and surface density of the pole piece 220 a based on the radiation intensity measurement value.

[0122] In some embodiments, the calculation method of the thickness and surface density of the pole piece 220a has been described in detail above and will not be repeated here. In actual operation, I0 is known, and I is obtained by the detector 60, and the required t and m can be obtained by manual calculation and substitution into the relevant formula.

[0123] Alternatively, a control module 70 may be directly set up, and the I obtained by the detector 60 is transmitted to the control module 70. After the control module 70 obtains the rays emitted by the generator 50, the photon signal is converted into an electrical signal, and the thickness and surface density are directly calculated in the control module 70, thereby realizing the automatic measurement of the thickness and surface density of the electrode 220a.

[0124] In some embodiments, the pole piece 220a measurement method further includes the following steps:

[0125] S60, controlling the generator 50 to switch different projection ports 51 and the radiation source 52 of the generator 50 to be opposite to each other in the third direction L3;

[0126] Among them, the generator 50 also includes a radiation source 52, and the projection port 51 includes multiple ones, and the size of each projection port 51 in the first direction L1 is larger than its own size in the second direction L2, and the sizes of the multiple projection ports 51 in the first direction L1 are different and / or the sizes in the second direction L2 are different.

[0127] S60 may be performed simultaneously with step S20. The specific switching method of the projection port 51 has been described in detail above and will not be repeated here.

[0128] In this way, in order to ensure the accuracy of thickness measurement of different areas on the electrode 220a, projection ports 51 with different sizes are provided. When measuring the thinned area 220a1, the projection port 51 with smaller size is opposite to the radiation source 52 in the third direction L3, and the radiation source 52 forms a narrower ray spot 50a on the thinned area 220a1. When measuring the non-thinned area, the projection port 51 with larger size is opposite to the radiation source 52 in the third direction L3, and the radiation source 52 forms a slightly wider ray spot 50a on the non-thinned area to improve measurement accuracy.

[0129] According to some embodiments of the present application, please refer to Figures 3 to 8. The present application provides a pole piece measurement system 100 that can be used to measure the thickness and surface density of the thinned area 220a1 and non-thinned area of ​​the pole piece 220a. In some embodiments, the pole piece measurement system 100 includes a base 10, a first conveyor 20, a support frame 31, a second conveyor 40, a generator 50, and a detector 60. The first conveyor 20 conveys the pole piece 220a along a first direction L1, and the second conveyor 40 drives the support frame 31 to reciprocate relative to the pole piece 220a along a second direction L2. During the movement of the support frame 31, the generator 50 emits radiation, and the detector 60, which is directly opposite to the generator 50 in the third direction L3, receives the radiation. In this way, the thickness and surface density of the pole piece 220a can be calculated based on the radiation intensity value emitted by the generator 50 and the radiation intensity measurement value after passing through the pole piece 220a, thereby realizing the detection of the pole piece 220a in a high temperature environment.

[0130] In addition, the generator 50 projects a ray spot 50a of the same size as the projection port 51 through the projection port 51. Since the size of the projection port 51 in the first direction L1 is larger than the size in the second direction L2, the ray spot 50a is in the shape of a long strip on the pole piece 220a, and is smaller along the width direction of the pole piece 220a and larger along the length direction of the pole piece 220a. By adjusting the size of the projection port 51, the size of the ray spot 50a in the width of the pole piece 220a is also smaller, so that in the process of the support frame 31 driving the generator 50 and the detector 60 to move, multiple projections can be performed in the thinning area 220a1 along the width direction of the pole piece 220a, so that measurements can be taken as many times as possible to improve measurement accuracy.

[0131] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0132] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A pole piece measurement system for measuring the thickness and surface density of a pole piece, the pole piece measurement system comprising a base and a first transmission member, a support assembly, a generator and a detector all arranged on the base; The first conveying member is used to convey the pole piece along a first direction; The support assembly is connected to the generator and the detector, and is used to drive the generator and the detector to approach or move away from the pole piece along the second direction, the generator has a projection opening, and the size of the projection opening in the first direction is larger than the size in the second direction; in, The pole piece measurement system has a measuring state, in which the support assembly drives the generator and the detector to reciprocate relative to the pole piece along the second direction, and the generator and the detector are located on opposite sides of the pole piece in the third direction, and the first direction, the second direction and the third direction intersect each other; The generator emits radiation through the projection port, and the detector detects the radiation emitted by the generator and obtains a radiation intensity measurement value.

2. The pole piece measurement system according to claim 1, wherein: The pole piece measurement system further comprises a control module, and the control module is electrically connected to the detector; The control module can obtain the thickness and surface density of the pole piece based on the radiation intensity measurement value.

3. The pole piece measurement system according to any one of claims 1 to 2, wherein: The generator further includes a radiation source, the projection opening includes a plurality of projection openings, the size of each projection opening in the first direction is larger than the size in the second direction, and the sizes of the plurality of projection openings in the first direction are different; The generator is configured to be able to switch between different projection ports facing the radiation source in the third direction.

4. The pole piece measurement system according to any one of claims 1 to 2, wherein: The generator further includes a radiation source, the projection opening includes a plurality of projection openings, the size of each projection opening in the first direction is larger than the size in the second direction, and the sizes of the plurality of projection openings in the second direction are different; The generator is configured to be able to switch between different projection ports facing the radiation source in the third direction.

5. The pole piece measurement system according to any one of claims 1 to 2, wherein: The generator further includes a radiation source, the projection ports include a plurality of projection ports, the size of each projection port in the first direction is greater than the size in the second direction, and the sizes of the plurality of projection ports in the first direction are different, and the sizes of the plurality of projection ports in the second direction are different; The generator is configured to be able to switch between different projection ports facing the radiation source in the third direction.

6. The pole piece measurement system according to any one of claims 3 to 5, wherein: The generator comprises a housing, a straightening member and a third transmission member, the housing is connected to the support assembly, the radiation source is arranged in the housing, the straightening member is movably covered on one side of the housing and all the projection ports are opened in the straightening member; The third transmission member is transmission-connected to the straightening member and drives the straightening member to rotate relative to the circumference of the housing so that different projection ports are opposite to the radiation source.

7. The pole piece measurement system according to any one of claims 1 to 6, wherein: The support assembly comprises a second transmission member and a support frame, wherein the second transmission member is arranged on the base, and the generator and the detector are arranged on the support frame at intervals along the third direction; The second transmission member is used to drive the support frame to move along the second direction.

8. The pole piece measurement system according to claim 7, wherein: The support frame comprises a first support arm and a second support arm, wherein one end of the first support arm and the second support arm are connected in the second direction, and the other ends are opposite and spaced apart in the third direction; The generator and the detector are respectively arranged at one end of the first supporting arm and the second supporting arm which are spaced apart from each other.

9. The pole piece measurement system according to claim 7, wherein: The second transmission member includes a power member, a guide rail and a slider, wherein the guide rail is disposed on the base and arranged along the second direction, and the slider is connected to the support frame and is slidably connected to the guide rail; The power piece is connected to the sliding transmission and is used to drive the sliding block to drive the support frame to slide along the guide rail.

10. The pole piece measurement system according to any one of claims 1 to 9, wherein: The first conveying member comprises a first conveying roller and a second conveying roller, and the first conveying roller and the second conveying roller are arranged on the base at intervals along the first direction for conveying the pole piece; When the pole piece measurement system is in the measurement state, the generator is located in the first direction. between the first conveying roller and the second conveying roller.

11. A pole piece measurement method, comprising the following steps: Controlling the first conveyor to convey the pole piece along a first direction; Control the support assembly to drive the generator and the detector disposed opposite to and spaced apart from each other along the third direction to approach the pole piece along the second direction, until the generator and the detector are located on opposite sides of the pole piece in the third direction and reciprocate relative to the pole piece along the second direction; Controlling the generator to emit rays toward the pole piece through a projection port, wherein the size of the projection port in the first direction is larger than the size in the second direction, and the first direction, the second direction and the third direction intersect each other; Controlling the detector to detect the radiation emitted by the generator and obtain a radiation intensity measurement value; The thickness and surface density of the pole piece are calculated based on the radiation intensity measurement value.

12. The pole piece measurement method according to claim 11, wherein: The pole piece measurement method further comprises the following steps: Controlling the generator to switch different projection ports to be opposite to the radiation source of the generator in the third direction; Wherein, the generator also includes a radiation source, the projection ports include multiple ones, the size of each projection port in the first direction is larger than its own size in the second direction, and the sizes of the multiple projection ports in the first direction and the second direction are different.

Images