Pole piece rolling device and pole piece production system

Abstract

The utility model provides a pole piece rolling device and a pole piece production system, and belongs to the technical field of battery production. The pole piece rolling device comprises a roller, a marking module, a first detection module and a second detection module. The pole piece moves in the first direction, and the roller is configured to be used for rolling the pole piece; the marking module and the first detection module are both located on one side of the roller in the first direction, and the first detection module is located between the marking module and the roller; the second detection module is located on the other side of the roller in the first direction, and the roller is located between the first detection module and the second detection module. The distance between at least one of the first detection module and the second detection module and the pole piece is larger than or equal to 1 cm and smaller than or equal to 10 cm. According to the pole piece rolling device, the extension rate of the pole piece can be detected, and the detection efficiency and the detection precision are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular, to a pole piece rolling device and a pole piece production system. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Rechargeable batteries have the characteristics of storing energy or releasing energy according to needs, so they are widely used in various electrical devices or energy storage systems and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is an important factor related to its development.

[0003] A battery includes a pole piece, and the pole piece includes a current collector and an active material located on the surface of the current collector. During the production process of the pole piece, in order to improve the volumetric energy density of the battery, it is usually necessary to roll the active material on the pole piece to increase the compaction density of the active material. Under the action of rolling, the pole piece will extend outward, and the elongation rate of the pole piece can to a certain extent reflect the compactness and brittleness of the rolled pole piece. During the production process of the pole piece, the elongation rate of the pole piece will be detected.

[0004] In the related art, the elongation rate of the pole piece is calculated by manually detecting the lengths of the pole piece before and after rolling, and this detection method has low efficiency. Summary of the Utility Model

[0005] The present application aims to at least solve one of the technical problems existing in the background art. For this reason, an object of the present application is to provide a pole piece rolling device and a pole piece production system to solve the problem of low efficiency in detecting the elongation rate of the pole piece.

[0006] An embodiment of the first aspect of the present application provides a pole piece rolling device, including a rolling mill, a marking module, a first detection module, and a second detection module. The pole piece moves in a first direction, and the rolling mill is configured to roll the pole piece; the marking module is located on one side of the rolling mill along the first direction; the first detection module is located on one side of the rolling mill along the first direction, and the first detection module is located between the marking module and the rolling mill; the second detection module is located on the other side of the rolling mill along the first direction, and the rolling mill is located between the first detection module and the second detection module; wherein, the first detection module and the second detection module satisfy at least one of the following conditions: the distance between the first detection module and the pole piece is greater than or equal to 1 cm and less than or equal to 10 cm; the distance between the second detection module and the pole piece is greater than or equal to 1 cm and less than or equal to 10 cm.

[0007] In the technical solution of the embodiment of the present application, when the pole piece is rolled by the pole piece rolling device, the pole piece passes through the marking module, the first detection module, the rolling mill and the second detection module in sequence. When the pole piece passes through the marking module, the marking module can form a marking area on the surface of the pole piece. When the pole piece passes through the first detection module, the first detection module detects and records the marking area. After the pole piece is rolled, the pole piece passes through the second detection module, and the second detection module detects and records the rolled marking area. The distance between the first detection module or the second detection module and the pole piece is set to facilitate the identification of the marking area. By combining the data of the marking area detected and recorded by the first detection module and the second detection module, the elongation rate of the pole piece can be obtained. This detection method can detect the elongation rate of the pole piece during the rolling process of the pole piece, and the detection efficiency is higher.

[0008] In some embodiments, the marking module includes a storage tank, a transport channel and a nozzle. The storage tank has an accommodation space, and a marking substance is provided in the accommodation space. One end of the transport channel faces the pole piece, and the middle of the transport channel is communicated with the accommodation space. The nozzle is communicated with the other end of the transport channel. The marking substance in the storage tank can be sprayed onto the surface of the pole piece through the transport channel and the nozzle to form a marking area, which is convenient for simplifying the preparation process of the marking module.

[0009] In some embodiments, the storage tank has an opening, and the marking module further includes a cover body, which is detachably connected to the storage tank and is configured to cover the opening. The opening of the storage tank can cooperate with the cover body. When the marking module is working normally, the cover body can cover the opening to reduce the risk of leakage of the marking substance. At the same time, the cover body is convenient to open to expose the opening, which is beneficial to supplement and add the marking substance in the storage tank at any time.

[0010] In some embodiments, the minimum distance between the end of the transport channel facing the pole piece and the pole piece is greater than or equal to 1 cm and less than or equal to 5 cm. Setting the minimum distance between the end of the transport channel facing the pole piece and the pole piece within the above range can keep the size of the marking area formed on the surface of the pole piece within a suitable range, which is convenient for the first detection module and the second detection module to identify and detect the marking area.

[0011] In some embodiments, the cross-sectional area of the opening at the end of the transport channel facing the pole piece is greater than or equal to 0.1 cm 2 , and less than or equal to 1 cm 2 . Setting the cross-sectional area of the opening at the end of the transport channel facing the pole piece within the above range can reduce the problem that the nozzle is easily blocked due to too much marking substance transported. In addition, it can also prevent the size of the marking area formed on the surface of the pole piece from being too large, which is convenient for the first detection module and the second detection module to detect and identify the marking area.

[0012] In some embodiments, the difference between the grayscale value of the marking substance and the grayscale value of the surface of the electrode tab is greater than or equal to 20. Setting a difference between the grayscale value of the marking substance and the grayscale value of the active material on the surface of the electrode tab is conducive to the first detection module and the second detection module to identify the marked area, and improves the detection accuracy of the elongation rate of the electrode tab.

[0013] In some embodiments, the marking substance includes one of titanium dioxide and boehmite. The marking substance is white, making the difference between its grayscale value and the grayscale value of the active material on the surface of the electrode tab large enough, which is conducive to the first detection module and the second detection module to identify the marked area. At the same time, compared with the liquid marking substance, since the marking substance is in a dry state, it is convenient to remove the marking substance after detecting the elongation rate of the electrode tab, saving costs.

[0014] In some embodiments, the electrode tab includes a current collector and an active material on the surface of the current collector, and the ratio of the maximum particle size of the marking substance to the maximum particle size of the active material is less than or equal to 10. In this way, the difference between the maximum particle size of the marking substance and the maximum particle size of the active material will not be too large, so that the difference in the elongation degree between the marking substance and the active material will not be large, reducing the impact on the accuracy of the elongation rate of the electrode tab.

[0015] In some embodiments, the maximum particle size of the marking substance is less than or equal to 1 μm. Setting the maximum particle size of the marking substance within the above range can improve the detection accuracy of the first detection module and the second detection module for the marked area, thereby improving the accuracy of the detected elongation rate of the electrode tab.

[0016] In some embodiments, at least one of the first detection module and the second detection module includes a CCD camera. The CCD camera has high recognition accuracy. The number of pixel points included in the images of the marked area taken before and after rolling can be calculated by using the CCD camera, and the actual length values before and after rolling can be obtained by conversion, thereby improving the accuracy of the detected and calculated elongation rate of the electrode tab.

[0017] In some embodiments, the recognition accuracy of the CCD camera is less than or equal to 10 μm. The recognition accuracy of the CCD camera is small enough, which is conducive to improving the detection accuracy of the marked area, thereby improving the detection accuracy of the elongation rate of the electrode tab.

[0018] In some embodiments, the pole piece rolling device further includes a conveying module, and the marking module, the first detection module, and the second detection module are all connected to the conveying module. The conveying module is configured to move the marking module, the first detection module, and the second detection module along a second direction, and the second direction is the same as the extending direction of the roller. The conveying module facilitates the movement of the marking module, the first detection module, and the second detection module to detect the elongation rate of different regions on the pole piece, reducing the detection error that may be caused by a single detection. At the same time, by moving the first detection module and the second detection module, the first detection module and the second detection module are arranged along the second direction Y, and the relative positions of the first detection module and the second detection module are the same during the detection process, thereby reducing the error caused by the position deviation and improving the detection accuracy.

[0019] In some embodiments, the conveying module includes a plurality of guide rails. The guide rails extend along the second direction, and scale marks extending along the second direction are provided on the guide rails. The marking module, the first detection module, and the second detection module are respectively slidably connected to different guide rails. By setting the scale marks, it is beneficial for the marking module, the first detection module, and the second detection module to be aligned with each other when sliding on the guide rails, saving the time for adjusting the positions between the modules.

[0020] In some embodiments, the pole piece rolling device further includes a control module, which is communicatively connected to both the first detection module and the second detection module. The control module is configured to obtain the first data of the first detection module and the second data of the second detection module, and determine the elongation rate of the pole piece based on the first data and the second data. Through the control module, the elongation rate of the pole piece can be quickly calculated. Compared with manual calculation, the calculation result is more accurate and efficient.

[0021] An embodiment of the second aspect of the present application provides a pole piece production system, which includes the pole piece rolling device in the above embodiments.

[0022] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application and should not be regarded as limiting the scope of the present application.

[0024] Figure 1 It is the front view of the pole piece rolling device rolling the pole piece in some embodiments of the present application;

[0025] Figure 2 A cross-sectional view of a pole piece provided by an embodiment of the present application;

[0026] Figure 3 A front view of a pole piece being roll-pressed by a pole piece roll-pressing device according to other embodiments of the present application;

[0027] Figure 4 A schematic structural diagram of a marking module according to some embodiments of the present application;

[0028] Figure 5 A top view of a pole piece being roll-pressed by a pole piece roll-pressing device according to some embodiments of the present application;

[0029] Figure 6 A top view of a guide rail according to some embodiments of the present application;

[0030] Figure 7 A block diagram of a pole piece roll-pressing device according to some embodiments of the present application.

[0031] Explanation of reference numerals:

[0032] 10. Roll; 11. Upper roll; 12. Lower roll; 20. Marking module; 21. Storage tank; 211. Accommodating space; 212. Marking substance; 22. Transportation channel; 23. Nozzle; 24. Valve; 25. Cover; 30. First detection module; 40. Second detection module; 50. Transfer module; 51. Guide rail; 52. Scale mark; 60. Control module; 70. Over-roll; 100. Pole piece; 101. Current collector; 102. Active material; First direction X; Second direction Y. Detailed implementation manners

[0033] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field 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 accompanying drawing descriptions are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0036] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the term "and / or" is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0038] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0039] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0041] At present, from the perspective of the development of the market situation, rechargeable batteries are more and more widely used. Rechargeable batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in various electronic devices, such as electric vehicles, electric motorcycles, electric cars and other electric transportation vehicles, as well as multiple fields such as equipment and aerospace. With the continuous expansion of the application fields of rechargeable batteries, the market demand is also constantly increasing.

[0042] The battery includes electrode sheets. During the production process of the electrode sheets, the electrode sheets will be roll-pressed to compact the active substances on the electrode sheets and improve the energy density of the battery. During the roll-pressing process of the electrode sheets, the electrode sheets will extend. The elongation rate of the electrode sheets will affect the compactness and brittleness of the electrode sheets. The compactness of the electrode sheets will affect the energy density of the battery, and the brittleness of the electrode sheets will affect the subsequent stretching process of the electrode sheets. Therefore, during the roll-pressing process of the electrode sheets, it is necessary to detect the elongation rate of the electrode sheets to understand the state of the electrode sheets after roll-pressing.

[0043] In the related art, the staff use a marker pen or a knife, etc. to make a certain length of mark on the electrode sheet before roll-pressing. After roll-pressing, the marked section is cut off, the change in the distance between the marks before and after roll-pressing is measured, and the elongation rate of the electrode sheet is calculated. This detection method has low efficiency.

[0044] Based on the above considerations, in order to solve the problem of low detection efficiency of the elongation rate of the electrode sheet, a roll-pressing device for electrode sheets is designed, which includes a rolling mill, a marking module, a first detection module, and a second detection module. The electrode sheet moves along a first direction, and the rolling mill is configured to roll-press the electrode sheet; both the marking module and the first detection module are located on one side of the rolling mill along the first direction, and the first detection module is located between the marking module and the rolling mill; the second detection module is located on the other side of the rolling mill along the first direction, and the rolling mill is located between the first detection module and the second detection module.

[0045] Along the moving direction of the electrode sheet, the marking module, the first detection module, the rolling mill, and the second detection module are arranged at intervals in sequence. Before the electrode sheet passes through the rolling mill, that is, before roll-pressing, the marking module can form a marking area on a part of the surface of the electrode sheet, and the first detection module detects and records this marking area; after the electrode sheet passes through the rolling mill, that is, after roll-pressing, the second detection module detects and records this marking area after roll-pressing. By combining the data of this marking area detected and recorded by the first detection module and the second detection module, the elongation rate of the electrode sheet can be indirectly obtained, which is beneficial to improving the detection efficiency of the elongation rate of the electrode sheet.

[0046] The roll-pressing device for electrode sheets disclosed in the embodiments of the present application can be applied in the processing scenario of batteries. Specifically, it can be applied in the scenario of cold pressing the electrode sheets. The roll-pressing device for electrode sheets disclosed in the present application can be used to detect the elongation rate of the electrode sheets. In this way, it is beneficial to improve the detection efficiency of the elongation rate of the electrode sheets, and thus can better guide the production of the electrode sheets.

[0047] Figure 1 This is the front view of the pole piece rolling device rolling the pole piece in some embodiments of the present application. Refer to Figure 1 , embodiments of the present application provide a pole piece rolling device, which includes a rolling roll 10, a marking module 20, a first detection module 30, and a second detection module 40. The pole piece 100 moves along the first direction X, and the rolling roll 10 is configured to roll the pole piece 100; both the marking module 20 and the first detection module 30 are located on one side of the rolling roll 10 along the first direction X, and the first detection module 30 is located between the marking module 20 and the rolling roll 10; the second detection module 40 is located on the other side of the rolling roll 10 along the first direction X, and the rolling roll 10 is located between the first detection module 30 and the second detection module 40.

[0048] Wherein, the first detection module 30 and the second detection module 40 satisfy at least one of the following conditions: the distance L2 between the first detection module 30 and the pole piece 100 is greater than or equal to 1 cm and less than or equal to 10 cm; the distance L3 between the second detection module 40 and the pole piece 100 is greater than or equal to 1 cm and less than or equal to 10 cm.

[0049] In some embodiments, Figure 2 This is a cross-sectional view of a pole piece provided by an embodiment of the present application. Refer to Figure 2 , the pole piece 100 includes a current collector 101 and an active material 102 located on at least one surface of the current collector 101. In Figure 2 , both surfaces of the current collector 101 have the active material 102. In other implementation manners, it may be that one surface of the current collector 101 has the active material 102.

[0050] Refer to Figure 1 , the rolling roll 10 includes an upper rolling roll 11 and a lower rolling roll 12. The extending direction of the upper rolling roll 11 is parallel to the extending direction of the lower rolling roll 12, the roll body of the upper rolling roll 11 faces the roll body of the lower rolling roll 12, and the pole piece 100 passes through between the roll body of the upper rolling roll 11 and the roll body of the lower rolling roll 12.

[0051] In the embodiments of the present application, the upper rolling roll 11 can usually precisely control the pressure distribution during the rolling process by adjusting its height or the applied pressure. The lower rolling roll 12 mainly plays a role in supporting the pole piece 100 and cooperating with the upper rolling roll 11 to complete the rolling. The lower rolling roll 12 needs to provide a stable supporting force to ensure that the pole piece 100 does not shake or shift during the rolling process, and to ensure the accuracy and stability of the rolling. The upper rolling roll 11 and the lower rolling roll 12 cooperate with each other. By applying a certain pressure to the pole piece 100, the pole piece 100 is squeezed between the two, and the active material 102 on the surface of the pole piece 100 can be extended under the action of the pressure, so as to achieve the compaction effect.

[0052] In some embodiments of the present application, the moving direction of the electrode sheet 100, i.e., the first direction X, may be a linear direction.

[0053] In some other embodiments of the present application, the first direction X may be a curved direction, so that the rollers 10, the marking module 20, the first detection module 30, and the second detection module 40 can be arranged in a limited space, reducing the floor space occupied by the electrode sheet rolling device.

[0054] Figure 3 It is the front view of the electrode sheet rolling device rolling the electrode sheet in some other embodiments of the present application. Refer to Figure 3 , the electrode sheet rolling device may further include a guide roller 70, and the guide roller 70 is located on at least one side of the roller 10 along the first direction X. Refer to Figure 3 , the electrode sheet rolling device includes two guide rollers 70, wherein the marking module 20, the first detection module 30, and the second detection module 40 are all located between the two guide rollers 70. In other implementation manners of the present application, the electrode sheet rolling device may include one guide roller 70, and the guide roller 70 is located on the same side of the marking module 20, the first detection module 30, and the second detection module 40.

[0055] In the embodiments of the present application, the guide roller 70 is used to guide the transmission of the electrode sheet 100. The guide roller 70 can provide a more accurate transmission path for the electrode sheet, so that the electrode sheet 100 enters and passes through the electrode sheet rolling device stably in a set direction. At the same time, by reasonably arranging the position and angle of the guide roller 70, the electrode sheet 100 can be kept moving in a straight line during the transmission process, avoiding phenomena such as deviation and distortion, improving the position accuracy of the electrode sheet 100 before and after rolling, and providing a good basis for subsequent processing procedures. The guide roller 70 can also provide continuous support points, evenly bear the weight of the electrode sheet 100, and keep the electrode sheet 100 in a good shape and posture during the transmission process, and can avoid damage to the electrode sheet 100 due to excessive local stress.

[0056] The marking module 20 is used to form a marking area on a part of the surface of the electrode sheet 100. In some embodiments, the shape of the formed marking area includes but is not limited to a circle, a square, or other irregular shapes, etc.

[0057] In some embodiments, the first detection module 30 and the second detection module 40 can record the marking area before and after rolling by taking pictures, and calculate data such as the length or area of the marking area, so as to convert and obtain the elongation rate of the electrode sheet 100.

[0058] Along the moving direction of the electrode plate 100, the marking module 20, the first detection module 30, the rolling mill 10, and the second detection module 40 are arranged at intervals in sequence. That is, during the process of rolling the electrode plate 100, along the moving direction of the electrode plate 100, the first detection module 30 is located downstream of the marking module 20, the rolling mill 10 is located downstream of the first detection module 30, and the second detection module 40 is located downstream of the rolling mill 10.

[0059] In some embodiments, the arrangement direction of the marking module 20, the first detection module 30, and the second detection module 40 is parallel to the first direction X.

[0060] In the embodiments of the present application, the distance L2 between the first detection module 30 and the electrode plate 100 is greater than or equal to 1 cm and less than or equal to 10 cm; or the distance L3 between the second detection module 40 and the electrode plate 100 is greater than or equal to 1 cm and less than or equal to 10 cm; or the distance L2 between the first detection module 30 and the electrode plate 100 is greater than or equal to 1 cm and less than or equal to 10 cm, and the distance L3 between the second detection module 40 and the electrode plate 100 is greater than or equal to 1 cm and less than or equal to 10 cm.

[0061] The distance L2 between the first detection module 30 and the electrode plate 100 and the distance L3 between the second detection module 40 and the electrode plate 100 may be equal or unequal.

[0062] In some embodiments, the distance L2 between the first detection module 30 and the electrode plate 100 may be 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm, or 10 cm.

[0063] In some embodiments, the distance L3 between the second detection module 40 and the electrode plate 100 may be 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm, or 10 cm.

[0064] In the embodiments of the present application, setting the distance between at least one of the first detection module 30 or the second detection module 40 and the electrode plate 100 within the above range is beneficial for the first detection module 30 or the second detection module 40 to recognize all the marked areas, and at the same time, it will not recognize too many other areas, so that the marked area occupies a larger area in the area recognized by the first detection module 30 or the second detection module 40, facilitating the recognition of the marked area and improving the detection accuracy.

[0065] In some embodiments of the present application, the difference between the distance L2 between the first detection module 30 and the electrode plate 100 and the distance L3 between the second detection module 40 and the electrode plate 100 is less than or equal to 0.5 cm.

[0066] Exemplarily, the distance L2 between the first detection module 30 and the pole piece 100 is equal to the distance L3 between the second detection module 40 and the pole piece 100.

[0067] When using the pole piece rolling device provided by the embodiment of the present application to roll the pole piece, the pole piece 100 sequentially passes through the marking module 20, the first detection module 30, the rolling mill 10, and the second detection module 40. When the pole piece 100 passes through the marking module 20, the marking module 20 can form a marking area on the surface of the pole piece 100. When the pole piece 100 passes through the first detection module 30, the first detection module 30 detects and records the marking area; after the pole piece 100 is rolled, the pole piece 100 passes through the second detection module 40, and the second detection module 40 detects and records the rolled marking area. The distance between the first detection module 30 or the second detection module 40 and the pole piece 100 is set to facilitate the identification of the marking area. Combining the data of the marking area detected and recorded by the first detection module 30 and the second detection module 40, the elongation rate of the pole piece 100 can be obtained. This detection method can detect the elongation rate of the pole piece during the rolling process of the pole piece, and the detection efficiency is higher.

[0068] In the related art, errors are likely to occur through the manual measurement method of the staff. The pole piece rolling device provided by the embodiment of the present application can automatically detect the elongation rate of the pole piece, and the detection accuracy is higher.

[0069] In the related art, the staff detects the elongation rate of the pole piece after the pole piece is completely rolled. If the rolling effect of the pole piece is not good and the elongation rate of the pole piece cannot reach the preset value, the staff cannot find it in time. In the embodiment of the present application, the pole piece rolling device can detect the elongation rate of the pole piece during the rolling process of the pole piece. If the rolling effect of the pole piece is not good and the elongation rate of the pole piece cannot reach the preset value, the staff can find it in time, adjust the rolling parameters, and reduce waste.

[0070] Figure 4 It is a schematic structural diagram of the marking module of some embodiments of the present application. Refer to Figure 4 , the marking module 20 includes a storage tank 21, a transport channel 22, and a nozzle 23. The storage tank 21 has an accommodation space 211, and a marking substance 212 is provided in the accommodation space 211; combining Figure 1 , Figure 3 and Figure 4 , one end of the transport channel 22 faces the pole piece 100, and the middle part of the transport channel 22 is communicated with the accommodation space 211; the nozzle 23 is communicated with the other end of the transport channel 22.

[0071] It can be understood that the storage tank 21 is a hollow structure. The embodiment of the present application does not limit the shape of the storage tank 21.

[0072] The marking substance 212 can be a solid substance or a liquid substance to facilitate the formation of a marking area. In some embodiments, the color of the marking substance 212 can be different from the color of the active substance 102 on the surface of the electrode 100, which is convenient for identifying the marking area.

[0073] The transportation channel 22 is used to connect the storage tank 21 and the external environment and can transport the marking substance 212 in the storage tank 21 to the surface of the electrode 100. The nozzle 23 can spray the marking substance 212 in the storage tank 21 onto the surface of the electrode 100 by means of compressed air. Exemplarily, the nozzle 23 inputs compressed air into the transportation channel 22, and the middle part of the transportation channel 22 is communicated with the accommodation space 211, so as to drive the marking substance 212 to be output from one end of the transportation channel 22 close to the electrode 100 to form a marking area on the surface of the electrode 100.

[0074] In some embodiments, the area of the formed marking area is less than or equal to 2 cm 2 (square centimeters).

[0075] Exemplarily, the pressure in the transportation channel 22 after compressed air can be greater than or equal to 0.1 Mpa (megapascal) and less than or equal to 10 MPa.

[0076] In some embodiments, the material of the transportation channel 22 can be metal. Exemplarily, the material of the transportation channel 22 can be stainless steel.

[0077] In some embodiments, a valve 24 is further provided between the transportation channel 22 and the connected storage tank 21 to control the spraying amount of the marking substance 212 sprayed onto the surface of the electrode 100.

[0078] The nozzle 23 can be arranged at one end of the transportation channel 22 facing the electrode 100. The nozzle 23, the transportation channel 22 and the storage tank 21 are all communicated.

[0079] In the embodiments of the present application, the marking substance 212 in the storage tank 21 can be sprayed onto the surface of the electrode 100 through the transportation channel 22 and the nozzle 23 to form a marking area, which is convenient for simplifying the preparation process of the marking module 20.

[0080] Reference Figure 4 , according to some embodiments of the present application, the storage tank 21 has an opening, and the marking module 20 further includes a cover body 25. The cover body 25 is detachably connected to the storage tank 21, and the cover body 25 is configured to cover the opening.

[0081] That is to say, in addition to one opening connected to the transportation channel 22, the storage tank 21 also has another opening. This opening communicates the accommodation space 211 and the external environment.

[0082] The shape of the cover 25 can be adapted to the shape of the opening so that the cover 25 can cover the opening.

[0083] In some embodiments, the connection manner between the cover 25 and the storage tank 21 includes but is not limited to threaded connection, snap connection, insertion connection, etc.

[0084] In the embodiments of the present application, the opening of the storage tank 21 can cooperate with the cover 25. When the marking module 20 is working properly, the cover 25 can cover the opening, reducing the risk of leakage of the marking substance 212. At the same time, the cover 25 is easy to open to expose the opening, which is beneficial to replenish the marking substance 212 in the storage tank 21 at any time.

[0085] According to some embodiments of the present application, the minimum distance L1 between the end of the transportation channel 22 facing the pole piece 100 and the pole piece 100 is greater than or equal to 1 cm (centimeter) and less than or equal to 5 cm.

[0086] In some embodiments, the minimum distance L1 between the end of the transportation channel 22 facing the pole piece 100 and the pole piece 100 can be 1 cm, 1.5 cm, 2 cm, 2.5 cm, 3 cm, 3.5 cm, 4 cm, 4.5 cm or 5 cm.

[0087] In the embodiments of the present application, setting the minimum distance L1 between the end of the transportation channel 22 facing the pole piece 100 and the pole piece 100 within the above range can keep the size of the marking area formed on the surface of the pole piece 100 within a suitable range, facilitating the first detection module 30 and the second detection module 40 to identify and detect the marking area.

[0088] According to some embodiments of the present application, the cross-sectional area of the opening at the end of the transportation channel 22 facing the pole piece 100 is greater than or equal to 0.1 cm 2 , less than or equal to 1 cm 2 .

[0089] In some embodiments, the cross-sectional area of the opening at the end of the transportation channel 22 facing the pole piece 100 can be 0.1 cm 2 , 0.2 cm 2 , 0.4 cm 2 , 0.6 cm 2 , 0.8 cm 2 or 1 cm 2 .

[0090] In some embodiments, the shape of the opening at the end of the transportation channel 22 facing the pole piece 100 includes but is not limited to circular, square or other irregular shapes, etc.

[0091] In the embodiments of the present application, the cross-section is perpendicular to the extending direction of the transportation channel 22.

[0092] In some embodiments, the cross-sectional area of the transport channel 22 is equal at any location.

[0093] In the embodiments of the present application, the cross-sectional area of the opening at one end of the transport channel 22 facing the electrode tab 100 is within the above range, reducing the problem that the nozzle 23 is prone to blockage due to excessive transported marking substance 212. In addition, it can also prevent the size of the marked area formed on the surface of the electrode tab 100 from being too large, facilitating the detection and recognition of the marked area by the first detection module 30 and the second detection module 40.

[0094] According to some embodiments of the present application, the difference between the gray value of the marking substance 212 and the gray value of the surface of the electrode tab 100 is greater than or equal to 20.

[0095] It can be understood that the difference between the gray value of the marking substance 212 and the gray value of the active material 102 on the surface of the electrode tab 100 is greater than or equal to 20.

[0096] In the embodiments of the present application, the gray value of the marking substance 212 and the gray value of the active material 102 on the surface of the electrode tab 100 are set to have a difference. Based on the difference in their gray values, it is beneficial for the first detection module 30 and the second detection module 40 to identify the marked area, improving the detection accuracy of the electrode tab elongation rate.

[0097] According to some embodiments of the present application, the marking substance 212 includes one of titanium dioxide and boehmite.

[0098] The marking substance 212 can be a dry substance. Both titanium dioxide and boehmite are white in color.

[0099] In the embodiments of the present application, the marking substance 212 is white, making the difference between its gray value and the gray value of the active material 102 on the surface of the electrode tab 100 large enough, which is beneficial for the first detection module 30 and the second detection module 40 to identify the marked area. At the same time, compared with the liquid marking substance 212, since the marking substance 212 is in a dry state, it is convenient to remove the marking substance 212 after detecting the electrode tab elongation rate, saving costs.

[0100] According to some embodiments of the present application, referring to Figure 2 , the electrode tab 100 includes a current collector 101 and an active material 102 on the surface of the current collector 101, and the ratio of the maximum particle size of the marking substance 212 to the maximum particle size of the active material 102 is less than or equal to 10.

[0101] That is to say, the maximum particle size of the marking substance 212 does not exceed 10 times the maximum particle size of the active substance 102 particles. Exemplarily, the ratio of the maximum particle size of the marking substance 212 to the maximum particle size of the active substance 102 is less than or equal to 2. For example, the maximum particle size of the marking substance 212 is equal to the maximum particle size of the active substance 102.

[0102] In the embodiments of the present application, the ratio between any two of all the particle sizes of the marking substance 212 is less than or equal to 2 and greater than or equal to 0.5.

[0103] In some embodiments, the particle sizes of the marking substance 212 may not be exactly the same. In other embodiments, the particle sizes of the active substance 102 may be the same.

[0104] In the embodiments of the present application, the difference between the maximum particle size of the marking substance 212 and the maximum particle size of the active substance 102 is not too large, so that the difference in the extension degree between the marking substance 212 and the active substance 102 is not large, reducing the impact on the accuracy of the extension rate of the pole piece.

[0105] According to some embodiments of the present application, the maximum particle size of the marking substance 212 is less than or equal to 1 μm (micrometer).

[0106] In some embodiments, the maximum particle size of the marking substance 212 may be 0.1 μm, 0.3 μm, 0.5 μm, 0.7 μm, 0.9 μm or 1 μm.

[0107] In the embodiments of the present application, setting the maximum particle size of the marking substance 212 within the above range can improve the detection accuracy of the first detection module 30 and the second detection module 40 for the marking area, thereby improving the accuracy of the detected extension rate of the pole piece.

[0108] According to some embodiments of the present application, at least one of the first detection module 30 and the second detection module 40 includes a CCD (Charge Coupled Device) camera.

[0109] In some embodiments, the CCD camera takes a picture of the marking area, identifies the marking area based on the difference in the gray value of the marking substance 212 and the gray value on the surface of the pole piece 100, and by detecting and recording the length of the marking area along the first direction X with the largest number of pixel points, the maximum length of the marking area along the first direction X can be obtained through conversion.

[0110] Exemplarily, the first detection module 30 is a CCD camera; or the second detection module 40 is a CCD camera; or both the first detection module 30 and the second detection module 40 are CCD cameras.

[0111] In the embodiments of the present application, the CCD camera has high recognition accuracy. The number of pixel points included in the marked area images captured before and after rolling can be calculated by using the CCD camera, so as to convert and obtain the actual length values before and after rolling, thereby improving the accuracy of detecting and calculating the elongation rate of the pole piece.

[0112] According to some embodiments of the present application, the recognition accuracy of the CCD camera is less than or equal to 10 μm.

[0113] That is to say, the actual real length corresponding to one pixel point in the CCD image is less than or equal to 10 μm. Exemplarily, the recognition accuracy of the CCD camera is equal to 1 μm; or the recognition accuracy of the CCD camera is equal to 5 μm.

[0114] In other embodiments, the recognition accuracy of the CCD camera can be 2 μm, 3 μm, 4 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm.

[0115] In the embodiments of the present application, the recognition accuracy of the CCD camera is small enough, which is beneficial to improving the detection accuracy of the marked area, thereby improving the detection accuracy of the pole piece elongation rate.

[0116] According to some embodiments of the present application, Figure 5 is a top view of the pole piece rolling device of some embodiments of the present application. Refer to Figure 5 , the pole piece rolling device further includes a conveying module 50. The marking module 20, the first detection module 30, and the second detection module 40 are all connected to the conveying module 50. The conveying module 50 is configured to move the marking module 20, the first detection module 30, and the second detection module 40 along the second direction Y. The second direction Y is the same as the extending direction of the rolling mill 10.

[0117] In some embodiments of the present application, the second direction Y can be perpendicular to the first direction X.

[0118] In the embodiments of the present application, the conveying module 50 facilitates the movement of the marking module 20, the first detection module 30, and the second detection module 40 to detect the elongation rates of different regions on the pole piece 100, reducing the detection error that may be caused by a single detection. At the same time, by moving the first detection module 30 and the second detection module 40, the first detection module 30 and the second detection module 40 are arranged along the first direction X, and the relative positions of the first detection module 30 and the second detection module 40 are the same during the detection process, thereby reducing the error caused by the position deviation and improving the detection accuracy.

[0119] Refer to Figure 5, according to some embodiments of the present application, the transfer module 50 includes a plurality of guide rails 51 that extend along the second direction Y, and the marking module 20, the first detection module 30, and the second detection module 40 are respectively slidably connected to different guide rails 51. Figure 6 is a top view of the guide rail in some embodiments of the present application, refer to Figure 6 , a scale mark 52 extending along the second direction Y is provided on the guide rail 51.

[0120] Exemplarily, the number of the guide rails 51 can be three.

[0121] Exemplarily, the resolution of the scale mark 52 can be 1 mm (millimeter).

[0122] In the embodiments of the present application, by setting the scale mark 52, it is beneficial for the marking module 20, the first detection module 30, and the second detection module 40 to be aligned with each other when sliding on the guide rail 51, saving the time for adjusting the positions between the modules.

[0123] According to some embodiments of the present application, Figure 7 is a block diagram of the pole piece rolling device in some embodiments of the present application, refer to Figure 7 , the pole piece rolling device further includes a control module 60. The control module 60 is communicatively connected to both the first detection module 30 and the second detection module 40. The control module 60 is configured to obtain the first data of the first detection module 30 and the second data of the second detection module 40, and determine the elongation rate of the pole piece 100 based on the first data and the second data.

[0124] In some embodiments, the first data can be an image detected by the first detection module 30, and the second data can be an image detected by the second detection module 40.

[0125] The first detection module 30 and the second detection module 40 respectively send the first data and the second data to the control module 60. The control module 60 determines the sizes of the marked area before and after rolling based on the first data and the second data, and determines the elongation rate of the pole piece 100 according to the sizes.

[0126] Exemplarily, the control module 60 can detect the maximum length along the first direction X of the marked area before rolling, denoted as the first length, and the maximum length along the first direction X after rolling, denoted as the second length. The ratio of the difference between the second length and the first length to the first length is the pole piece elongation rate.

[0127] In the embodiments of the present application, the control module 60 can quickly calculate the elongation rate of the pole piece 100. Compared with manual calculation, the calculation result is more accurate and the efficiency is higher.

[0128] In an embodiment of the present application, the control module 60 can also control the first detection module 30 and the second detection module 40 to capture images.

[0129] See Figure 7 , the control module 60 can also be communicatively connected to the marking module 20, and the control module 60 can control the marking module 20 to form a marking area on the electrode sheet 100.

[0130] In an embodiment of the present application, the communication connection can be a wired connection or a wireless connection.

[0131] An embodiment of the present application provides an electrode sheet production system, which includes the electrode sheet rolling device in the above embodiment.

[0132] The electrode sheet production system has the beneficial effects of the electrode sheet rolling device provided by the embodiment of the present application. For specific descriptions of the electrode sheet rolling device, reference can be made to the above embodiments, which will not be elaborated here.

[0133] An embodiment of the present application provides an electrode sheet rolling device, which includes a rolling roll 10, a marking module 20, a first detection module 30, and a second detection module 40. The electrode sheet 100 moves along the first direction X, and the rolling roll 10 is configured to roll the electrode sheet 100; both the marking module 20 and the first detection module 30 are located on one side of the rolling roll 10 along the first direction X, and the first detection module 30 is located between the marking module 20 and the rolling roll 10; the second detection module 40 is located on the other side of the rolling roll 10 along the first direction X, and the rolling roll 10 is located between the first detection module 30 and the second detection module 40. The marking module 20 includes a storage tank 21, a transport channel 22, and a nozzle 23. The storage tank 21 has an accommodation space 211, and a marking substance 212 is provided in the accommodation space 211; one end of the transport channel 22 faces the electrode sheet 100, and the middle of the transport channel 22 communicates with the accommodation space 211; the nozzle 23 communicates with the other end of the transport channel 22. The storage tank 21 has an opening, and the marking module 20 further includes a cover body 25, and the cover body 25 is detachably connected to the storage tank 21, and the cover body 25 is configured to cover the opening.

[0134] The minimum distance between the end of the transport channel 22 facing the electrode sheet 100 and the electrode sheet 100 is greater than or equal to 1 cm and less than or equal to 5 cm. The cross-sectional area of the opening at the end of the transport channel 22 facing the electrode sheet 100 is greater than or equal to 0.1 cm 2 , less than or equal to 1 cm 2The difference between the gray value of the marking substance 212 and the gray value of the surface of the electrode sheet 100 is greater than or equal to 20. The marking substance 212 includes one of titanium dioxide and boehmite. The electrode sheet 100 includes a current collector and an active material 102 located on the surface of the current collector, and the ratio of the maximum particle size of the marking substance 212 to the maximum particle size of the active material 102 is less than or equal to 10. The maximum particle size of the marking substance 212 is less than or equal to 1 μm.

[0135] At least one of the first detection module 30 and the second detection module 40 includes a CCD camera. The recognition accuracy of the CCD camera is less than or equal to 10 μm. The first detection module 30 and the second detection module 40 satisfy at least one of the following conditions: the distance between the first detection module 30 and the electrode sheet 100 is greater than or equal to 1 cm and less than or equal to 10 cm; the distance between the second detection module 40 and the electrode sheet 100 is greater than or equal to 1 cm and less than or equal to 10 cm.

[0136] The electrode sheet rolling device further includes a transfer module 50. The marking module 20, the first detection module 30, and the second detection module 40 are all connected to the transfer module 50. The transfer module 50 is configured to move the marking module 20, the first detection module 30, and the second detection module 40 along the second direction Y. The second direction Y is the same as the extension direction of the roller 10. The transfer module 50 includes a plurality of guide rails 51. The guide rails 51 extend along the second direction Y. Scale marks 52 extending along the second direction Y are provided on the guide rails 51. The marking module 20, the first detection module 30, and the second detection module 40 are respectively slidably connected to different guide rails 51. The electrode sheet rolling device further includes a control module 60, which is communicatively connected to both the first detection module 30 and the second detection module 40. The control module 60 is configured to obtain the first data of the first detection module 30 and the second data of the second detection module 40, and determine the elongation rate of the electrode sheet 100 based on the first data and the second data.

[0137] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pole piece rolling device, characterized in that, The electrode rolling device includes: A rolling roll (10) configured to roll an electrode (100), and the electrode (100) moves in a first direction; A marking module (20) located on one side of the rolling roll (10) along the first direction, A first detection module (30) located on one side of the rolling roll (10) along the first direction, and the first detection module (30) is located between the marking module (20) and the rolling roll (10); A second detection module (40) located on the other side of the rolling roll (10) along the first direction, and the rolling roll (10) is located between the first detection module (30) and the second detection module (40); Wherein, the first detection module (30) and the second detection module (40) satisfy at least one of the following conditions: The distance between the first detection module (30) and the electrode (100) is greater than or equal to 1 cm and less than or equal to 10 cm; The distance between the second detection module (40) and the electrode (100) is greater than or equal to 1 cm and less than or equal to 10 cm.

2. The pole piece rolling device according to claim 1, characterized in that, The marking module (20) includes: A storage tank (21) having an accommodation space (211), and a marking substance (212) is provided in the accommodation space (211); A transport channel (22), one end of the transport channel (22) faces the electrode (100), and the middle of the transport channel (22) is communicated with the accommodation space (211); A nozzle (23) communicated with the other end of the transport channel (22).

3. The pole piece rolling device according to claim 2, characterized in that, The storage tank (21) has an opening, and the marking module (20) further includes a cover body (25), the cover body (25) is detachably connected to the storage tank (21), and the cover body (25) is configured to cover the opening.

4. The pole piece rolling device according to claim 2, characterized in that, The minimum distance between the end of the transport channel (22) facing the electrode (100) and the electrode (100) is greater than or equal to 1 cm and less than or equal to 5 cm.

5. The pole piece rolling device according to claim 2, wherein The cross-sectional area of the opening at one end of the transport channel (22) facing the electrode tab (100) is greater than or equal to 0.1 cm 2 , and less than or equal to 1 cm 2 .

6. The pole piece rolling device according to claim 2, characterized in that, The difference between the gray value of the marking substance (212) and the gray value of the surface of the electrode (100) is greater than or equal to 20.

7. The pole piece rolling device according to claim 2, wherein, The marking substance (212) includes one of titanium dioxide and boehmite.

8. The pole piece rolling device according to claim 2, wherein, The electrode (100) includes a current collector (101) and an active substance (102) located on the surface of the current collector, and the ratio of the maximum particle size of the marking substance (212) to the maximum particle size of the active substance (102) is less than or equal to 10.

9. The pole piece rolling device according to claim 8, characterized in that, The maximum particle size of the marking substance (212) is less than or equal to 1 μm.

10. The pole piece rolling device according to any one of claims 1 to 9, characterized in that, At least one of the first detection module (30) and the second detection module (40) includes a CCD camera.

11. The pole piece rolling device according to claim 10, characterized in that, The recognition accuracy of the CCD camera is less than or equal to 10 μm.

12. The pole piece rolling device according to any one of claims 1 to 9, characterized in that, The electrode rolling device further includes: A transfer module (50), wherein the marking module (20), the first detection module (30) and the second detection module (40) are all connected to the transfer module (50), and the transfer module (50) is configured to move the marking module (20), the first detection module (30) and the second detection module (40) in a second direction, and the second direction is the same as the extension direction of the roller (10).

13. The pole piece rolling device according to claim 12, characterized in that, The transfer module (50) includes a plurality of guide rails (51) extending in the second direction, and scale marks (52) extending in the second direction are provided on the guide rails (51), and the marking module (20), the first detection module (30) and the second detection module (40) are respectively slidably connected to different guide rails (51).

14. The pole piece rolling device according to any one of claims 1 to 9, characterized in that, The pole piece rolling device further includes: A control module (60), which is communicatively connected to both the first detection module (30) and the second detection module (40), and the control module (60) is configured to obtain the first data of the first detection module (30) and the second data of the second detection module (40), and determine the elongation rate of the pole piece (100) based on the first data and the second data.

15. A pole piece production system, characterized in that, The pole piece production system includes the pole piece rolling device according to any one of claims 1 to 14.

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