Strip material detection device, winding apparatus, and method for manufacturing electrode assembly

Abstract

Provided in the present application are a strip material detection device, a winding apparatus, and a method for manufacturing an electrode assembly. The strip material detection device comprises a mounting frame, a first roller, a second roller, and a detection component, wherein the first roller is connected to the mounting frame and is rotatable about a first axis. The second roller is connected to the mounting frame and is rotatable about a second axis; the first axis is parallel to the second axis; a passage for a strip material to pass through is formed between the first roller and the second roller; and the second roller is movable close to or away from the first roller in a first direction. The detection component is configured to detect the displacement of the second roller in the first direction.

Description

Strip material detection device, winding equipment and manufacturing method of electrode assembly

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202410009190.7, filed on January 3, 2024, entitled “Strip Material Detection Device, Winding Equipment, and Manufacturing Method of Electrode Assembly,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a strip material detection device, a winding device, and a method for manufacturing an electrode assembly. Background Art

[0004] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0005] The preparation of electrode assemblies is crucial in the battery manufacturing process, as the yield rate of electrode assemblies directly impacts the economic benefits of batteries. Therefore, effectively improving the yield rate of electrode assemblies is a pressing issue in battery technology.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a strip material detection device, a winding device and a manufacturing method of an electrode assembly, which can effectively improve the product yield of the electrode assembly.

[0008] In a first aspect, embodiments of the present application provide a web material detection device comprising a mounting frame, a first roller, a second roller, and a detection component. The first roller is connected to the mounting frame and is capable of rotating about a first axis. The second roller is connected to the mounting frame and is capable of rotating about a second axis, the first axis being parallel to the second axis. A passage for the web material to pass through is formed between the first roller and the second roller, and the second roller is capable of approaching or moving away from the first roller in a first direction. The detection component is configured to detect displacement of the second roller in the first direction.

[0009] The strip detection device can obtain the thickness information of at least one of the electrode sheet and the isolation member during the preparation of the electrode assembly, and adjust the winding device for winding the electrode sheet and the isolation member accordingly according to the thickness information to reduce the misalignment deviation of the electrode tabs between multiple formed electrode assemblies, thereby improving the alignment of the electrode tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0010] In some embodiments of the first aspect, the detection component includes a first detection member and a second detection member, and the first detection member and the second detection member are respectively disposed at two ends of the second roller along a direction parallel to the second axis, thereby improving the accuracy of the detection component in obtaining thickness information of the strip.

[0011] In some embodiments of the first aspect, the belt material detection device further includes a guide rod, the mounting frame is provided with a guide hole, the guide rod is passed through the guide hole and is movably connected to the mounting frame along the first direction, and the guide rod is fixed to the second roller.

[0012] The cooperation between the guide rod and the guide hole can limit the offset of the second roller in the direction perpendicular to the first direction during the movement of the second roller along the first direction, and can reduce the deviation between the displacement of the second roller along the first direction and the thickness of the strip, thereby improving the accuracy of the detection component in obtaining the thickness information of the strip.

[0013] In some embodiments of the first aspect, the guide rod is configured to be movable along a first direction when an external force applied thereto reaches a first threshold.

[0014] The above technical solution can improve the stability of the guide rod and reduce the risk of accidental movement of the guide rod, thereby improving the accuracy of the detection component in obtaining the thickness information of the strip.

[0015] In some embodiments of the first aspect, the guide rod is frictionally connected to the hole wall of the guide hole.

[0016] The above technical solution sets a friction connection between the guide rod and the wall of the guide hole, and uses the value corresponding to the maximum static friction force between the guide rod and the wall of the guide hole as the above-mentioned first threshold. The first threshold can be adjusted to adapt to different application environments only by adjusting the maximum static friction force between the guide rod and the wall of the guide hole. The structure is simple, which is conducive to reducing the overall preparation difficulty and cost of the battery module.

[0017] In some embodiments of the first aspect, the guide hole passes through the mounting frame along the first direction, which can increase the range of movement of the guide rod along the first direction, thereby increasing the detection range of the strip thickness, and thus improving the applicability of the strip detection device.

[0018] In some embodiments of the first aspect, an end of the guide rod remote from the second roller extends out of the guide hole, and a limit member is provided at the end of the guide rod remote from the second roller. The limit member can limit displacement of the guide rod in a direction toward the first roller, thereby reducing the risk of the guide rod accidentally falling off.

[0019] In some embodiments of the first aspect, there are two guide rods, which are respectively disposed at two ends of the second roller in a direction parallel to the second axis, thereby further improving the stability of the roller moving in the first direction.

[0020] In some embodiments of the first aspect, the strip material detection device further includes an adjustment component, which is communicatively connected to the detection component. The adjustment unit is used to obtain thickness information of the detection component and adjust the target device for winding the strip material according to the thickness information.

[0021] In this way, the above technical solution, by setting an adjustment component, can enable the strip material detection device to measure the thickness of the strip material and automatically generate thickness information, and automatically adjust the target device for winding the strip material according to the thickness information, which can effectively improve the degree of automation of the strip material detection device, reduce manual intervention, and help reduce costs.

[0022] In some embodiments of the first aspect, the strip material detection device further includes a support component connected between the mounting frame and the second roller, capable of exerting a force on the second roller to move closer to the first roller. This improves the stability of the second roller and reduces the risk of unintended movement of the second roller, thereby further improving the accuracy of the strip material thickness information obtained by the detection component. The support component is capable of deforming or expanding along the first direction based on the magnitude of the external force applied to it.

[0023] In some embodiments of the first aspect, the supporting component is an elastic member that can adaptively deform elastically according to the magnitude of the external force applied to it, has a simple structure, and is conducive to reducing costs while improving the stability of the second roller.

[0024] In some embodiments of the first aspect, a detection frequency S of the detection component satisfies the relationship: 200 times / second ≤ S ≤ 1000 times / second. By setting the detection frequency S of the detection component within the above range, the overall cost of the strip material detection device can be reduced while meeting measurement accuracy requirements.

[0025] In the second aspect, the present application provides a winding device, which includes a pole piece unwinding device, an isolating piece unwinding device, a winding device and a strip detection device provided by any embodiment of the first aspect, the pole piece unwinding device is used to provide the pole piece, the isolating piece unwinding device is used to provide the isolating piece, the winding device is used to wind the pole piece and the isolating piece, the strip detection device is arranged upstream of the winding device, and at least one of the isolating piece and the pole piece passes between the first roller and the second roller.

[0026] The strip detection device can obtain the thickness information of at least one of the electrode sheet and the isolation member during the preparation of the electrode assembly, and adjust the winding device for winding the electrode sheet and the isolation member accordingly according to the thickness information to reduce the misalignment deviation of the electrode tabs between multiple formed electrode assemblies, thereby improving the alignment of the electrode tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0027] In some embodiments of the second aspect, two strip material detection devices are provided, and two pole piece unwinding devices are provided. The pole pieces provided by the two pole piece unwinding devices are configured to pass between the first roller and the second roller of the two strip material detection devices, respectively.

[0028] In this way, the above technical solution can improve the accuracy of adjusting the position of the tabs between the electrode assemblies after forming by adjusting the winding device accordingly according to the thickness information of the first electrode sheet and the thickness information of the second electrode sheet, thereby further improving the product yield of the electrode assembly.

[0029] In some embodiments of the second aspect, four strip material detection devices are provided, two electrode piece unwinding devices are provided, and two spacer unwinding devices are provided. The electrode pieces provided by the two electrode piece unwinding devices are configured to pass between first and second rollers of the two strip material detection devices, respectively. The spacers provided by the two spacer unwinding devices are configured to pass between first and second rollers of the other two strip material detection devices, respectively.

[0030] In this way, the above technical solution can further improve the accuracy of adjusting the position of the tabs between the electrode assemblies after forming by adjusting the winding device accordingly according to the thickness information of the first electrode sheet, the thickness information of the second electrode sheet, the thickness information of the first insulating member, and the thickness information of the second insulating member, thereby further improving the product yield of the electrode assembly.

[0031] In some embodiments of the second aspect, two strip material detection devices are provided, two pole piece unwinding devices are provided, and two spacer unwinding devices are provided. The pole piece provided by one pole piece unwinding device and the spacer provided by the spacer unwinding device are configured to pass together between the first roller and the second roller of one strip material detection device. The pole piece provided by another pole piece unwinding device and the spacer provided by another spacer unwinding device are configured to pass together between the first roller and the second roller of another strip material detection device.

[0032] In this manner, the above technical solution adjusts the winding device accordingly based on the thickness information of the first and second composite strips. Compared to single-piece strips such as electrode sheets or separators, the first and second composite strips have relatively greater rigidity. Consequently, the first and second composite strips experience relatively less deformation when passing between the first and second rollers of the strip detection device, reducing data fluctuations during the strip detection device's measurement process. This further improves the accuracy of adjusting the tab positions between the formed electrode assemblies, thereby further increasing the product yield of the electrode assemblies.

[0033] In some embodiments of the second aspect, two strip material detection devices are provided, two pole piece unwinding devices are provided, and two spacer unwinding devices are provided. The pole piece provided by one pole piece unwinding device and the spacer provided by two spacer unwinding devices are configured to pass together between the first roller and the second roller of one strip material detection device. The pole piece provided by another pole piece unwinding device is configured to pass between the first roller and the second roller of another strip material detection device.

[0034] In this way, the above technical solution adjusts the winding device accordingly based on the thickness information of the third composite strip and the thickness information of the second electrode piece. This increases the rigidity of the third composite strip, resulting in less deformation of the third composite strip when passing between the first and second rollers of the strip detection device, thereby reducing data fluctuations during the strip detection device's measurement process. Furthermore, the thickness information of the second electrode piece is closer to the actual thickness variation of the electrode strip. Therefore, the combination of the thickness information of the third composite strip and the thickness information of the second electrode piece can provide thickness data with the advantages of low fluctuation and high reproducibility.

[0035] In some embodiments of the second aspect, one strip material detection device is provided, two pole piece unwinding devices are provided, and two spacer unwinding devices are provided. The pole pieces provided by the two pole piece unwinding devices and the spacers provided by the two spacer unwinding devices are configured to pass together between the first roller and the second roller of one strip material detection device.

[0036] In this way, the above technical solution adjusts the winding device accordingly based on the thickness information of the fourth composite strip, thereby increasing the rigidity of the fourth composite strip. Consequently, the fourth composite strip undergoes less deformation when passing between the first and second rollers of the strip detection device, thereby reducing data fluctuations and errors during the strip detection device's measurement process. This further improves the accuracy of adjusting the tab positions between the formed electrode assemblies, thereby further improving the product yield of the electrode assemblies.

[0037] In a third aspect, the present application provides a method for manufacturing an electrode assembly, the method comprising:

[0038] Provide pole pieces and separators;

[0039] Winding the electrode sheets and separators of a predetermined size, and then cutting the electrode sheets and separators to form an electrode assembly;

[0040] Winding again to produce multiple electrode assemblies;

[0041] During the winding process, measuring the thickness information of at least one of the pole piece and the separator, and providing feedback to adjust the winding device for winding the pole piece and the separator;

[0042] The thickness information is measured using a strip material detection device as claimed in any one of claims 1 to 12.

[0043] In this way, the above technical solution can reduce the misalignment deviation of the tabs between multiple formed electrode assemblies, thereby improving the alignment of the tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assemblies.

[0044] In some embodiments of the third aspect, the step of feedback regulating a winding device for winding the pole piece and the separator includes:

[0045] The winding device is adjusted according to first thickness information A1 of one of two adjacent electrode assemblies during the winding process and second thickness information A2 of the other of the two adjacent electrode assemblies during the winding process.

[0046] In this way, during the manufacturing process of the electrode assembly, after the manufacturing of the previous electrode assembly is completed, the winding parameters of the next electrode assembly can be adjusted in time, which is beneficial to improving the product yield of the entire electrode assembly manufacturing production line.

[0047] In some embodiments of the third aspect, adjusting the winding device according to first thickness information A1 of one of two adjacent electrode assemblies during the winding process and second thickness information A2 of the other of the two adjacent electrode assemblies during the winding process includes:

[0048] The circumference L of the winding needle of the winding device is adjusted according to the first thickness information A1 and the second thickness information A2.

[0049] By adjusting the circumference L of the winding needle of the winding device, the process is simple and easy to operate, which can reduce the overall manufacturing difficulty of the electrode assembly and is conducive to further improving the product yield of the electrode assembly.

[0050] In some embodiments of the third aspect, the first thickness information A1, the second thickness information A2, and the circumference L of the winding needle of the winding device satisfy the following relationship: A2 - A1 = N * L, where N is the number of winding turns. Using this formula to adjust the circumference of the winding needle of the winding device can improve adjustment accuracy while reducing computational complexity.

[0051] In some embodiments of the third aspect, adjusting the winding device according to first thickness information A1 of one of two adjacent electrode assemblies during the winding process and second thickness information A2 of the other of the two adjacent electrode assemblies during the winding process includes:

[0052] The pressure Q of the embossing roller of the winding device is adjusted according to the first thickness information A1 and the second thickness information A2.

[0053] By adjusting the pressure Q of the embossing roller of the winding device, the alignment of the tabs between multiple formed electrode assemblies can be improved while having little impact on the dimensions between the multiple electrode assemblies, thereby helping to improve the product consistency of the electrode assemblies.

[0054] In some embodiments of the third aspect, the first thickness information A1, the second thickness information A2, and the pressure Q of the embossing roller of the winding device satisfy the following relationship: A2 - A1 = N * L + b * Q, where N is the number of winding turns, L is the circumference of the winding needle, and b is a constant coefficient. Using this formula to adjust the embossing roller of the winding device can improve adjustment accuracy while reducing computational complexity.

[0055] 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

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0057] FIG1 is a schematic structural diagram of a strip material detection device provided in some embodiments of the present application;

[0058] FIG2 is a schematic structural diagram of a winding device provided in some embodiments of the present application;

[0059] FIG3 is a schematic structural diagram of another winding device provided in some embodiments of the present application;

[0060] FIG4 is a schematic structural diagram of another winding device provided in some embodiments of the present application;

[0061] FIG5 is a schematic structural diagram of another winding device provided in some embodiments of the present application;

[0062] FIG6 is a schematic structural diagram of another winding device provided in some embodiments of the present application;

[0063] FIG7 is a schematic flow chart of a method for preparing an electrode assembly provided in some embodiments of the present application.

[0064] The accompanying drawings in the specific implementation manner are as follows:

[0065] 100, pole piece unwinding device; 200, spacer unwinding device; 300, winding device; 400, strip material detection device; 500, first connecting component; 600, second connecting component; 700, third connecting component; 800, fourth connecting component;

[0066] 10. Mounting frame; 11. Guide hole; 20. First roller; 21. First axis; 30. Second roller; 31. Second axis; 40. Detection component; 41. First detection component; 42. Second detection component; 50. Guide rod; 60. Limiting component; 70. Adjustment component; 80. Support component; X, first direction. DETAILED DESCRIPTION

[0067] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are 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.

[0068] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application 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 drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0069] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the 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.

[0070] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0071] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0072] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0073] The term "plurality" used in this application refers to two or more (including two).

[0074] In this application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0075] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0076] The preparation of electrode assemblies is crucial in the battery manufacturing process, and the product yield of electrode assemblies directly affects the economic benefits of the battery. Currently, winding devices are typically used to wind electrode strips and separator strips to form electrode assemblies. During this process, the thickness deviations of the electrode strips and separator strips affect the product yield of the electrode assemblies. For example, multiple formed electrode assemblies are prone to tab misalignment, resulting in a high scrap rate for the electrode assemblies, which in turn affects the product yield of the electrode assemblies and leads to poor economic benefits for the battery.

[0077] Based on the above considerations, the inventors conducted in-depth research and designed a web material detection device. The web material detection device includes a mounting frame, a first roller, a second roller, and a detection component. The first roller is connected to the mounting frame and can rotate about a first axis. The second roller is connected to the mounting frame and can rotate about a second axis. The first axis is parallel to the second axis. A channel for the web material to pass through is formed between the first and second rollers. The second roller can move toward or away from the first roller in a first direction. The detection component is used to detect displacement of the second roller in the first direction.

[0078] In this way, by setting up a material detection device, the material detection device can obtain the thickness information of at least one of the electrode sheet and the isolation member during the preparation of the electrode assembly, and make corresponding adjustments to the winding device for winding the electrode sheet and the isolation member according to the thickness information to reduce the misalignment deviation of the electrode tabs between multiple formed electrode assemblies, thereby improving the alignment of the electrode tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0079] The technical solution described in the embodiment of the present application can be applied to pole pieces and separators, and can also be used for other strips. Among them, the pole piece can be a positive pole piece or a negative pole piece.

[0080] In some embodiments, the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0081] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0082] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, this application is not limited to these materials; other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used singly or in combination of two or more.

[0084] In some embodiments, the positive electrode may be a carbon foam or a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or an alloy foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0085] In some embodiments, the negative electrode sheet may include a negative electrode current collector.

[0086] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with a silver surface treatment may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0088] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0089] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0090] In some embodiments, the negative electrode may be made of carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0091] As an example, the negative electrode current collector may be filled with or / and deposited with a lithium source material, potassium metal, or sodium metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0092] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0093] In some embodiments, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0094] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the pole pieces and isolation membranes described above, but can also be applied to all strips. However, for the sake of simplicity, the following embodiments are explained using pole pieces and isolation membranes as examples.

[0095] FIG1 is a schematic structural diagram of a strip material detection device provided in some embodiments of the present application.

[0096] As shown in FIG1 , an embodiment of the present application provides a strip material detection device 400. The strip material detection device 400 includes a mounting frame 10, a first roller 20, a second roller 30, and a detection component 40. The first roller 20 is connected to the mounting frame 10 and can rotate about a first axis 21. The second roller 30 is connected to the mounting frame 10 and can rotate about a second axis 31. The first axis 21 is parallel to the second axis 31. A channel for the strip material to pass through is formed between the first roller 20 and the second roller 30. The second roller 30 can approach or move away from the first roller 20 along a first direction X. The detection component 40 is used to detect the displacement of the second roller 30 along the first direction X.

[0097] For example, the first roller 20 can be detachably connected to the mounting frame 10 or fixedly mounted on the mounting frame 10. The first roller 20 can be directly connected to the mounting frame 10 or secured to the mounting frame 10 by other components. For example, the connection between the first roller 20 and the mounting frame 10 can be, but is not limited to, welding, bolting, clamping, or riveting.

[0098] As an example, the first roller 20 may include a first connecting shaft and a first roller 20 cylinder, wherein the first connecting shaft is fixedly connected to the mounting frame 10, and the first roller 20 cylinder is sleeved on the first connecting shaft and can rotate along the axis of the first connecting shaft. Optionally, the axis of the first connecting shaft and the axis of the first roller 20 cylinder coincide with each other.

[0099] For example, the second roller 30 can be detachably connected to the mounting frame 10 or fixedly mounted on the mounting frame 10. The second roller 30 can be directly connected to the mounting frame 10 or secured to the mounting frame 10 by other components. For example, the connection between the second roller 30 and the mounting frame 10 can be, but is not limited to, welding, bolting, clamping, or riveting.

[0100] As an example, the second roller 30 may include a second connecting shaft and a second roller 30 tube, wherein the second connecting shaft is fixedly connected to the mounting frame 10, and the second roller 30 tube is sleeved on the second connecting shaft and can rotate along the axis of the second connecting shaft. Optionally, the axis of the second connecting shaft and the axis of the second roller 30 tube coincide.

[0101] For example, the second roller 30 and the first roller 20 are opposite to each other along a first direction X, forming a channel for the strip to pass through between the first roller 20 and the second roller 30. The first direction X can be understood as the thickness direction of the strip. The strip can be at least one of a pole piece and a separator.

[0102] The second roller 30 is movably connected to the mounting frame 10 and can move toward or away from the first roller 20 along the first direction X. When the strip passes between the first roller 20 and the second roller 30, the strip can exert a supporting force on the second roller 30 away from the first roller 20, causing the second roller 30 to move in a direction away from the first roller 20. Since the thickness of the strip varies at different locations, the supporting force exerted on the second roller 30 away from the first roller 20 at different locations of the strip will also vary. It is understood that the greater the thickness of the strip, the greater the supporting force exerted by the strip on the second roller 30; and the smaller the thickness of the strip, the smaller the supporting force exerted by the strip on the second roller 30.

[0103] It should be noted that when the strip material has not passed between the first roller 20 and the second roller 30, in other words, when the strip material detection device 400 is in the initial state, the first roller 20 and the second roller 30 may be in contact with each other, or there may be a certain preset distance between the first roller 20 and the second roller 30 along the first direction X, and the preset distance is less than the minimum thickness of the strip material.

[0104] Exemplarily, the detection component 40 may be a displacement sensor capable of detecting the displacement of the second roller 30 along the first direction X. When the strip passes between the first roller 20 and the second roller 30 , the thickness information of the strip is obtained based on the change in the displacement of the second roller 30 along the first direction X.

[0105] The detection component 40 is connected to the second roller 30. Optionally, the detection component 40 may be detachably connected to the second roller 30 or fixedly mounted on the second roller 30. The detection component 40 may be directly connected to the second roller 30 or secured to the second roller 30 via other components. For example, the connection between the detection component 40 and the second roller 30 may be, but is not limited to, welding, bolting, clamping, or riveting.

[0106] For example, during the preparation of an electrode assembly, before winding the electrode sheet and separator, the strip inspection device 400 can measure the thickness of at least one of the electrode sheet and separator to obtain thickness information, and then adjust the winding device for winding the electrode sheet and separator accordingly based on the thickness information to correct the position of the electrode tab of the formed electrode assembly. At the same time, the strip inspection device 400 can also detect defective electrode sheets or separators. It should be noted that if the electrode sheet or separator does not meet the manufacturing requirements, a defective product mark will be affixed to the electrode sheet or separator. The defective product mark itself has a certain thickness. When the electrode sheet or separator with the defective product mark passes between the first roller 20 and the second roller 30 of the strip inspection device 400, the thickness data detected by the detection component 40 will suddenly change, thereby being able to identify the electrode sheet or separator that does not meet the manufacturing requirements, so that the electrode sheet or separator that does not meet the manufacturing requirements can be removed.

[0107] Optionally, adjusting the winding device includes but is not limited to adjusting the circumference of the winding needle of the winding device, adjusting the pressure of the embossing roller of the winding device, adjusting the pole piece tension mechanism of the winding device, or adjusting the die-cutting mechanism of the winding device.

[0108] Alternatively, the thickness information can be the average of multiple thickness point values ​​on the electrode sheet forming an electrode assembly, and the winding device is adjusted based on the average of the multiple thickness point values. Alternatively, the thickness information can be the median of multiple thickness point values ​​on the electrode sheet forming an electrode assembly, and the winding device is adjusted based on the median of the multiple thickness point values. This can reduce adjustment errors and improve adjustment accuracy. As an example, after the detection component 40 obtains multiple thickness point values, it first filters out obviously abnormal point values ​​and then takes the average or median value of the remaining multiple thickness point values.

[0109] As an example, a first section of electrode and a first section of separator are first provided. The material detection device 400 measures the thickness of at least one of the first section of electrode and the first section of separator, obtains first thickness information, and winds the first section of electrode and the first section of separator to form a first electrode assembly. A second section of electrode and a second section of separator are then provided. The material detection device 400 measures the thickness of at least one of the second section of electrode and the second section of separator, obtains second thickness information, adjusts the winding device according to the first and second thickness information, and winds the second section of electrode and the second section of separator after adjustment to form a second electrode assembly. The first section of electrode and the second section of electrode can be continuous, and the first section of separator and the second section of separator can be continuous. In one example, when the second thickness information is greater than the first thickness information, the circumference of the winding needle of the winding device can be reduced or the pressure of the embossing roller of the winding device can be reduced, and then the second section of the electrode piece and the second section of the insulating member are wound to form a second electrode assembly; when the second thickness information is less than the first thickness information, the circumference of the winding needle of the winding device can be increased or the pressure of the embossing roller of the winding device can be increased, and then the second section of the electrode piece and the second section of the insulating member are wound to form a second electrode assembly.

[0110] In this way, by setting up the material detection device 400, the material detection device 400 can obtain the thickness information of at least one of the electrode sheet and the isolation member during the preparation of the electrode assembly, and make corresponding adjustments to the winding device for winding the electrode sheet and the isolation member according to the thickness information to reduce the misalignment deviation of the electrode tabs between multiple formed electrode assemblies, thereby improving the alignment of the electrode tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0111] In some embodiments, the detection component 40 includes a first detection member 41 and a second detection member 42 . The first detection member 41 and the second detection member 42 are respectively disposed at two ends of the second roller 30 along a direction parallel to the second axis 31 .

[0112] For example, the first detection member 41 and the second detection member 42 can simultaneously detect the displacement of both ends of the second roller 30 in a direction parallel to the second axis 31 , which can improve the accuracy of the detection component 40 in obtaining the thickness information of the strip.

[0113] In some embodiments, the belt material detection device 400 further includes a guide rod 50 , the mounting frame 10 is provided with a guide hole 11 , the guide rod 50 is passed through the guide hole 11 and is movably connected to the mounting frame 10 along the first direction X, and the guide rod 50 is fixed to the second roller 30 .

[0114] Exemplarily, one end of the guide rod 50 is fixed to the second roller 30. The guide rod 50 cooperates with the guide hole 11 to limit the offset of the second roller 30 in a direction perpendicular to the first direction X during the movement of the second roller 30 along the first direction X, and can reduce the deviation between the displacement of the second roller 30 along the first direction X and the thickness of the strip, thereby improving the accuracy of the detection component 40 in obtaining the thickness information of the strip.

[0115] Optionally, the guide rod 50 may be detachably connected to the second roller 30 or may be fixedly mounted on the second roller 30. The guide rod 50 may be directly connected to the second roller 30 or may be secured to the second roller 30 via other components. For example, the connection between the guide rod 50 and the second roller 30 may be, but is not limited to, welding, bolting, clamping, or riveting.

[0116] In some embodiments, the guide rod 50 is configured to move along the first direction X when the external force applied thereto reaches a first threshold.

[0117] For example, a preload is provided between the guide rod 50 and the mounting bracket 10 to enable the guide rod 50 to move in the first direction X when the external force applied thereto reaches a first threshold value. This improves the stability of the guide rod 50 and reduces the risk of the guide rod 50 unexpectedly moving due to vibration of the strip detection device 400, which could result in a larger error in detecting the strip thickness. The first threshold value can be understood as the magnitude of the preload.

[0118] Optionally, a nut may be provided on the guide rod 50, and the nut may be connected to the mounting frame 10 at one end along the first direction X, and a pre-tightening force may be provided to the guide rod 50 through the friction between the nut and the guide rod 50, and the maximum static friction between the nut and the guide rod 50 may be configured as the above-mentioned first threshold value; or a counterweight may be provided on the guide rod 50, and the counterweight may be capable of providing a force to the guide rod 50 toward the first roller 20, and a pre-tightening force may be provided to the guide rod 50 through the gravity of the counterweight itself, and the gravity of the counterweight may be configured as the above-mentioned first threshold value.

[0119] The above technical solution can improve the stability of the guide rod 50 and reduce the risk of accidental movement of the guide rod 50, thereby improving the accuracy of the detection component 40 in obtaining the thickness information of the strip.

[0120] In some embodiments, the guide rod 50 is frictionally connected to the wall of the guide hole 11 .

[0121] For example, the guide rod 50 is frictionally connected to the wall of the guide hole 11. Static friction exists between the guide rod 50 and the wall of the guide hole 11, and the maximum static friction between the guide rod 50 and the wall of the guide hole 11 is configured to be the aforementioned first threshold. When the strip passes between the first roller 20 and the second roller 30, the strip exerts a supporting force on the second roller 30 that moves away from the first roller 20. When this supporting force exceeds the maximum static friction between the guide rod 50 and the wall of the guide hole 11, the second roller 30 is able to move away from the first roller 20.

[0122] The above technical solution sets a friction connection between the guide rod 50 and the wall of the guide hole 11, and uses the value corresponding to the maximum static friction force between the guide rod 50 and the wall of the guide hole 11 as the above-mentioned first threshold. The first threshold can be adjusted to adapt to different application environments only by adjusting the maximum static friction force between the guide rod 50 and the wall of the guide hole 11. The structure is simple, which is conducive to reducing the overall preparation difficulty and cost of the battery module.

[0123] In some embodiments, the guide hole 11 passes through the mounting frame 10 along the first direction X, which can increase the range of movement of the guide rod 50 along the first direction X, thereby increasing the detection range of the strip thickness, thereby improving the applicability of the strip detection device 400.

[0124] In some embodiments, the end of the guide rod 50 away from the second roller 30 extends out of the guide hole 11, and a limit member 60 is provided at the end of the guide rod 50 away from the second roller 30. The limit member 60 can limit the displacement of the guide rod 50 in the direction close to the first roller 20, thereby reducing the risk of the guide rod 50 accidentally falling off.

[0125] Optionally, the stopper 60 may be detachably connected to the second roller 30 or fixedly disposed on the second roller 30. The stopper 60 may be directly connected to the second roller 30 or constrained to the second roller 30 by other components. As an example, the connection between the stopper 60 and the second roller 30 may be, but is not limited to, welding, bolting, clamping, or riveting.

[0126] Optionally, the limiting member 60 may be, but is not limited to, a rod-shaped structure, a block-shaped structure, or a sheet-shaped structure.

[0127] Optionally, the number of the limiting member 60 may be one or more. For example, when there is only one limiting member 60, the limiting member 60 may be arranged to extend along the circumference of the guide rod 50; when there are multiple limiting members 60, the multiple limiting members 60 may be spaced apart and distributed along the circumference of the guide rod 50.

[0128] Optionally, the stopper 60 and the guide rod 50 can be integrally formed. This simplifies the manufacturing process by eliminating the need for an additional joining process. Furthermore, compared to a separate joining process, the integral structure of the stopper 60 and the guide rod 50 provides a more secure connection.

[0129] In some embodiments, there are two guide rods 50 , which are respectively disposed at both ends of the second roller 30 in a direction parallel to the second axis 31 , which can further improve the stability of the movement along the first direction X.

[0130] In some embodiments, the strip material detection device 400 further includes an adjustment component 70 , which is in communication with the detection component 40 . The adjustment component 70 is configured to obtain thickness information of the detection component 40 and adjust a target device for winding the strip material according to the thickness information.

[0131] For example, when the strip passes between the first roller 20 and the second roller 30, the detection component 40 measures the strip and generates thickness information. The adjustment component 70 communicates with the detection component 40 to obtain the thickness information. The adjustment component 70 processes the thickness information and can also communicate with the winding device to adjust the winding device based on the thickness information. The adjustment component 70 can be a computing chip.

[0132] In this way, the above technical solution, by setting the adjustment component 70, can enable the strip material detection device 400 to measure the thickness of the strip material and automatically generate thickness information, and automatically adjust the target device for winding the strip material according to the thickness information, which can effectively improve the degree of automation of the strip material detection device 400, reduce manual intervention, and help reduce costs.

[0133] In some embodiments, the belt material detection device 400 further includes a support component 80 , which is connected between the mounting frame 10 and the second roller 30 . The support component 80 can apply a force to the second roller 30 to move it closer to the first roller 20 .

[0134] For example, the support member 80 is supported between the mounting frame 10 and the second roller 30 to apply a force to the second roller 30 toward the first roller 20. This improves the stability of the second roller 30 and reduces the risk of unexpected movement of the second roller 30, thereby further improving the accuracy of the strip thickness information obtained by the detection member 40. The support member 80 can deform or expand and contract along the first direction X according to the magnitude of the external force applied to it.

[0135] Optionally, the support member 80 may be detachably connected to the mounting frame 10 and the second roller 30, or may be fixedly mounted on the mounting frame 10 and the second roller 30. The support member 80 may be directly connected to the mounting frame 10 and the second roller 30, or may be secured to the mounting frame 10 and the second roller 30 by other components. As an example, the connection between the support member 80 and the mounting frame 10 and the second roller 30 may be, but is not limited to, welding, bolting, clamping, or riveting.

[0136] In some embodiments, the supporting component 80 is an elastic component that can undergo adaptive elastic deformation according to the magnitude of the external force applied to it. The structure is simple, which helps to reduce costs while improving the stability of the second roller 30.

[0137] Alternatively, the elastic member may be, but is not limited to, a spring or a rubber plug. For example, if the elastic member is a spring, the spring may be sleeved on the guide rod 50; if the elastic member is a rubber plug, the rubber plug may be spaced apart from the guide rod 50 in a direction parallel to the second axis 31.

[0138] In some embodiments, the detection frequency S of the detection component 40 satisfies the relationship: 200 times / second≤S≤1000 times / second.

[0139] For example, the detection frequency S of the detection component 40 may be, but is not limited to, 200 times / second, 300 times / second, 400 times / second, 500 times / second, 600 times / second, 700 times / second, 800 times / second, 900 times / second, 1000 times / second, etc. Preferably, the detection frequency S of the detection component 40 is 700 times / second ≤ S ≤ 1000 times / second, for example, 1000 times / second.

[0140] It is understood that the higher the detection frequency S of the detection component 40, the higher the measurement accuracy of the strip material by the strip material detection device 400; at the same time, the higher the performance requirements for the detection component 40, the higher the cost of the strip material detection device 400. The lower the detection frequency S of the detection component 40, the lower the measurement accuracy of the strip material by the strip material detection device 400; at the same time, the lower the performance requirements for the detection component 40, the lower the cost of the strip material detection device 400.

[0141] In this way, by setting the detection frequency S of the detection component 40 within the above range, the overall cost of the strip material detection device 400 can be reduced while meeting the measurement accuracy requirements.

[0142] FIG2 is a schematic structural diagram of a winding device provided in some embodiments of the present application.

[0143] Continuing to refer to Figure 2, according to some embodiments of the present application, the present application also provides a winding device, which includes a pole piece unwinding device 100, an isolating piece unwinding device 200, a winding device 300 and a strip detection device 400 of any of the above schemes, the pole piece unwinding device 100 is used to provide the pole piece, the isolating piece unwinding device 200 is used to provide the isolating piece, the winding device 300 is used to wind the pole piece and the isolating piece, the strip detection device 400 is arranged upstream of the winding device 300, and at least one of the isolating piece and the pole piece passes between the first roller 20 and the second roller 30.

[0144] Exemplarily, the electrode sheet unwinding device 100 and the separator unwinding device 200 are arranged in parallel, so that the electrode sheet provided by the electrode sheet unwinding device 100 and the separator provided by the separator unwinding device 200 are both fed into the winding device 300 for winding. The strip material detection device 400 is arranged upstream of the winding device 300. Before the electrode sheet and the separator enter the winding device 300 for winding, at least one of the electrode sheet and the separator will first pass between the first roller 20 and the second roller 30 of the strip material detection device 400. The strip material detection device 400 measures the thickness of at least one of the electrode sheet and the separator to obtain thickness information, and then adjusts the winding device 300 accordingly based on the thickness information to correct the position of the electrode tab of the formed electrode assembly.

[0145] Optionally, the number of pole piece unwinding devices 100 can be set to two, and the two pole piece unwinding devices 100 respectively provide a first pole piece and a second pole piece, and the polarities of the first pole piece and the second pole piece are opposite; the number of isolating piece unwinding devices 200 can be set to two, and the two isolating piece unwinding devices 200 respectively provide a first isolating piece and a second isolating piece.

[0146] Optionally, the number of the material detection devices 400 can be one, two, three, four or more, which can be selected according to the actual application environment.

[0147] In some embodiments, two strip material detection devices 400 are provided, and two pole piece unwinding devices 100 are provided. The pole pieces provided by the two pole piece unwinding devices 100 are configured to pass between the first roller 20 and the second roller 30 of the two strip material detection devices 400 respectively.

[0148] For example, two electrode unwinding devices 100 provide a first electrode and a second electrode, respectively, with the first electrode and the second electrode having opposite polarities. Before winding, the first electrode passes between the first roller 20 and the second roller 30 of the two strip material detection devices 400, which measure the thickness of the first electrode to obtain thickness information of the first electrode. Before winding, the second electrode passes between the first roller 20 and the second roller 30 of the two strip material detection devices 400, which measure the thickness of the second electrode to obtain thickness information of the second electrode.

[0149] In this way, the above technical solution can improve the accuracy of adjusting the position of the tabs between the electrode assemblies after forming by adjusting the winding device 300 accordingly based on the thickness information of the first electrode sheet and the thickness information of the second electrode sheet, thereby further improving the product yield of the electrode assembly.

[0150] FIG3 is a schematic structural diagram of another winding device provided in some embodiments of the present application.

[0151] Continuing with reference to FIG3 , in some embodiments, four strip material inspection devices 400 are provided, two electrode piece unwinding devices 100 are provided, and two spacer unwinding devices 200 are provided. The electrode pieces provided by the two electrode piece unwinding devices 100 are configured to pass between the first roller 20 and the second roller 30 of the two strip material inspection devices 400, respectively. The spacers provided by the two spacer unwinding devices 200 are configured to pass between the first roller 20 and the second roller 30 of the other two strip material inspection devices 400, respectively.

[0152] For example, two electrode unwinding devices 100 respectively provide a first electrode and a second electrode, and the polarities of the first electrode and the second electrode are opposite. The number of the isolating element unwinding devices 200 can be set to two, and the two isolating element unwinding devices 200 respectively provide a first isolating element and a second isolating element. Before winding, the first electrode and the second electrode pass through the first roller 20 and the second roller 30 of the two strip material detection devices 400 respectively, one of which measures the thickness of the first electrode to obtain thickness information of the first electrode, and the other of which measures the thickness of the second electrode to obtain thickness information of the second electrode; before winding, the first isolating element and the second isolating element respectively pass through the first roller 20 and the second roller 30 of the two strip material detection devices 400 respectively, one of which measures the thickness of the first isolating element to obtain thickness information of the first isolating element, and the other of which measures the thickness of the second isolating element to obtain thickness information of the second isolating element.

[0153] In this way, the above technical solution can further improve the accuracy of adjusting the position of the tabs between the electrode assemblies after forming by adjusting the winding device 300 accordingly according to the thickness information of the first electrode sheet, the thickness information of the second electrode sheet, the thickness information of the first insulating member, and the thickness information of the second insulating member, thereby further improving the product yield of the electrode assembly.

[0154] FIG4 is a schematic structural diagram of another winding device provided in some embodiments of the present application.

[0155] Continuing with reference to FIG4 , in some embodiments, two strip material inspection devices 400 are provided, two pole piece unwinding devices 100 are provided, and two spacer unwinding devices 200 are provided. The pole piece provided by one pole piece unwinding device 100 and the spacer provided by the spacer unwinding device 200 are configured to pass together between the first roller 20 and the second roller 30 of one strip material inspection device 400. The pole piece provided by another pole piece unwinding device 100 and the spacer provided by another spacer unwinding device 200 are configured to pass together between the first roller 20 and the second roller 30 of another strip material inspection device 400.

[0156] For example, two electrode unwinding devices 100 respectively provide a first electrode and a second electrode, the first electrode and the second electrode having opposite polarities. The number of spacer unwinding devices 200 can be set to two, and the two spacer unwinding devices 200 respectively provide a first spacer and a second spacer. After lamination, the first electrode and the first spacer form a first composite strip. The first composite strip passes between the first roller 20 and the second roller 30 of one strip detection device 400. The strip detection device 400 measures the thickness of the first composite strip to obtain thickness information of the first composite strip. After lamination, the second electrode and the second spacer form a second composite strip. The second composite strip passes between the first roller 20 and the second roller 30 of another strip detection device 400. The strip detection device 400 measures the thickness of the second composite strip to obtain thickness information of the second composite strip.

[0157] In this manner, the above technical solution adjusts the winding device 300 accordingly based on the thickness information of the first and second composite strips. Compared to single-piece strips such as electrode sheets or separators, the first and second composite strips have relatively greater rigidity. Consequently, the first and second composite strips experience relatively little deformation when passing between the first and second rollers 20 and 30 of the strip detection device 400. This can reduce data fluctuations during the measurement process of the strip detection device 400, further improving the accuracy of adjusting the tab positions between the formed electrode assemblies and, in turn, further improving the product yield of the electrode assemblies.

[0158] In some optional embodiments, the electrode unwinding device 100 includes a first connecting member 500, which can connect the stacked first electrode and the first separator, so that the first electrode and the first separator are stacked and connected to form a first composite strip. This can improve the reliability of the first composite strip and reduce the risk of misalignment between the first electrode and the first separator when the first composite strip passes between the first roller 20 and the second roller 30 of the strip detection device 400.

[0159] For example, the first connecting member 500 may be, but is not limited to, a pressure roller or a glue sprayer. As an example, if the first connecting member 500 is a pressure roller, the pressure roller can press and connect the first electrode piece and the first separator; as another example, if the first connecting member 500 is a glue sprayer, the glue sprayer can spray glue to bond the first electrode piece and the first separator.

[0160] In some optional embodiments, the electrode unwinding device 100 includes a second connecting member 600, which can connect the stacked second electrode pieces to the second separator, so that the second electrode pieces and the separator are stacked and connected to form a second composite strip. This can improve the reliability of the second composite strip and reduce the risk of misalignment of the second electrode piece and the separator when the second composite strip passes between the first roller 20 and the second roller 30 of the strip detection device 400.

[0161] For example, the second connecting member 600 may be, but is not limited to, a pressure roller or a glue sprayer. As an example, if the second connecting member 600 is a pressure roller, the pressure roller can press and connect the second electrode piece and the second separator; as another example, if the second connecting member 600 is a glue sprayer, the glue sprayer can spray glue to bond the second electrode piece and the second separator.

[0162] FIG5 is a schematic structural diagram of another winding device provided in some embodiments of the present application.

[0163] Continuing with reference to FIG5 , in some embodiments, two strip material inspection devices 400 are provided, two pole piece unwinding devices 100 are provided, and two spacer unwinding devices 200 are provided. The pole piece provided by one pole piece unwinding device 100 and the spacer provided by two spacer unwinding devices 200 are configured to pass between the first roller 20 and the second roller 30 of one strip material inspection device 400. The pole piece provided by another pole piece unwinding device 100 is configured to pass between the first roller 20 and the second roller 30 of another strip material inspection device 400.

[0164] For example, two electrode unwinding devices 100 provide a first electrode and a second electrode, respectively, with the first and second electrode having opposite polarities. The number of spacer unwinding devices 200 can be set to two, with the two spacer unwinding devices 200 providing a first spacer and a second spacer, respectively. After lamination, the first electrode, the first spacer, and the second spacer form a third composite strip. The third composite strip passes between the first roller 20 and the second roller 30 of one strip inspection device 400, which measures the thickness of the third composite strip to obtain thickness information of the third composite strip. The second electrode passes between the first roller 20 and the second roller 30 of another strip inspection device 400, which measures the thickness of the second electrode to obtain thickness information of the second electrode.

[0165] In this way, the above technical solution adjusts the winding device 300 accordingly based on the thickness information of the third composite strip and the thickness information of the second electrode piece. This increases the rigidity of the third composite strip, resulting in a smaller deformation of the third composite strip when passing between the first roller 20 and the second roller 30 of the strip detection device 400, thereby reducing data fluctuations during the measurement process of the strip detection device 400. At the same time, the thickness information of the second electrode piece is closer to the actual thickness variation of the electrode piece strip. Therefore, the combination of the thickness information of the third composite strip and the thickness information of the second electrode piece can provide thickness data with the advantages of both low fluctuation and high reproducibility.

[0166] In some optional embodiments, the electrode unwinding device 100 includes a third connecting member 700, which can connect the stacked first electrode, first separator, and second separator to form a second composite strip. This improves the reliability of the third composite strip and reduces the risk of misalignment of the first electrode, first separator, and second separator when the third composite strip passes between the first roller 20 and the second roller 30 of the strip detection device 400.

[0167] For example, the third connecting component 700 may be, but is not limited to, a pressure roller or a glue sprayer. As an example, when the third connecting component 700 is a pressure roller, the pressure roller can press and connect the first electrode piece, the first separator, and the second separator; as another example, when the third connecting component 700 is a glue sprayer, the glue sprayer can spray glue to bond the first electrode piece, the first separator, and the second separator.

[0168] FIG6 is a schematic structural diagram of another winding device provided in some embodiments of the present application.

[0169] 6 , in some embodiments, one strip material inspection device 400 is provided, two pole piece unwinding devices 100 are provided, and two spacer unwinding devices 200 are provided. The pole pieces provided by the two pole piece unwinding devices 100 and the spacers provided by the two spacer unwinding devices 200 are configured to pass through the first roller 20 and the second roller 30 of the strip material inspection device 400.

[0170] For example, two electrode unwinding devices 100 provide a first electrode and a second electrode, respectively, with the first and second electrode having opposite polarities. Two spacer unwinding devices 200 can be provided, each providing a first spacer and a second spacer. After lamination, the first electrode, the first spacer, the second electrode, and the second spacer form a fourth composite strip. The fourth composite strip passes between a first roller 20 and a second roller 30 of a strip inspection device 400. The strip inspection device 400 measures the thickness of the fourth composite strip to obtain thickness information of the fourth composite strip.

[0171] In this way, the above technical solution adjusts the winding device 300 accordingly based on the thickness information of the fourth composite strip, thereby increasing the rigidity of the fourth composite strip. Consequently, the fourth composite strip undergoes less deformation when passing between the first roller 20 and the second roller 30 of the strip detection device 400, thereby reducing data fluctuations and errors during the measurement process of the strip detection device 400. This further improves the accuracy of adjusting the tab positions between the formed electrode assemblies, thereby further improving the product yield of the electrode assemblies.

[0172] In some optional embodiments, the electrode unwinding device 100 includes a fourth connecting component 800, which can connect the stacked first electrode, first separator, second electrode, and second separator, so that the first electrode, first separator, second electrode, and second separator are stacked and connected to form a second composite strip. This can improve the reliability of the fourth composite strip and reduce the risk of misalignment of the first electrode, first separator, second electrode, and second separator when the fourth composite strip passes between the first roller 20 and the second roller 30 of the strip detection device 400.

[0173] For example, the fourth connecting component 800 may be, but is not limited to, a pressure roller or a glue sprayer. As an example, when the fourth connecting component 800 is a pressure roller, the pressure roller can press and connect the first electrode piece, the first separator, the second electrode piece, and the second separator; as another example, when the fourth connecting component 800 is a glue sprayer, the glue sprayer can spray glue to bond the first electrode piece, the first separator, the second electrode piece, and the second separator.

[0174] FIG7 is a schematic flow chart of a method for preparing an electrode assembly provided in some embodiments of the present application.

[0175] Continuing to refer to FIG7 , according to some embodiments of the present application, the present application further provides a method for manufacturing an electrode assembly, the method for manufacturing an electrode assembly comprising:

[0176] Step 110, providing a pole piece and a spacer;

[0177] Step 120 , winding the electrode sheets and separators of a predetermined size, and then cutting the electrode sheets and separators to form an electrode assembly;

[0178] Step 130, winding again to produce a plurality of electrode assemblies;

[0179] During the winding process in steps 120 and 130 , the thickness information of at least one of the pole piece and the isolator is measured, and the winding device 300 for winding the pole piece and the isolator is fed back to adjust the thickness information; wherein the thickness information is measured using the strip material detection device 400 of any of the above schemes.

[0180] For example, during the manufacturing process of the electrode assembly, the pole piece unwinding device 100 provides the pole piece, the separator unwinding device 200 provides the separator, and the pole piece and the separator enter the winding device 300 together for winding. When the pole piece and the separator are wound to a predetermined size, the pole piece and the separator are cut to form an electrode assembly. According to the above process, the pole piece and the separator are continued to be wound to produce a plurality of electrode assemblies. In particular, during the winding process, the strip material detection device 400 can measure at least one of the pole piece and the separator to obtain thickness information of at least one of the pole piece and the separator, and adjust the winding device 300 according to the thickness information to correct the position of the pole ear of the electrode assembly after forming.

[0181] As an example, the electrode unwinding device 100 and the separator unwinding device 200 respectively provide a first electrode section and a first separator section, the material detection device 400 measures the thickness of at least one of the first electrode section and the first separator section and obtains first thickness information A1, and the winding device 300 winds the first electrode section and the first separator section to form a first electrode assembly. The electrode unwinding device 100 and the separator unwinding device 200 continue to provide a second electrode section and a second separator section, respectively, the material detection device 400 measures the thickness of at least one of the second electrode section and the second separator section and obtains second thickness information A2. The winding device 300 is adjusted based on the first thickness information A1 and the second thickness information A2, and the adjusted winding device 300 winds the second electrode section and the second separator section to form a second electrode assembly. Among them, when the second thickness information A2 is greater than the first thickness information A1, the circumference of the winding needle of the winding device 300 can be reduced or the pressure of the embossing roller of the winding device 300 can be reduced, and then the second section of the electrode and the second section of the isolation member are wound to form a second electrode assembly; when the second thickness information A2 is less than the first thickness information A1, the circumference of the winding needle of the winding device 300 can be increased or the pressure of the embossing roller of the winding device 300 can be increased, and then the second section of the electrode and the second section of the isolation member are wound to form a second electrode assembly.

[0182] It should be noted that the first thickness information A1 may be the average of multiple thickness point values ​​obtained by the detection component 40 on at least one of the first electrode segment and the first separator segment, or may be the median of multiple thickness point values ​​obtained by the detection component 40 on at least one of the first electrode segment and the first separator segment. As an example, after the detection component 40 obtains multiple thickness point values ​​on at least one of the first electrode segment and the first separator segment, it first filters out obviously abnormal point values ​​and then calculates the average or median value of the remaining multiple thickness point values.

[0183] Similarly, the second thickness information A2 may be an average value of multiple thickness point values ​​obtained by the detection component 40 on at least one of the second electrode segment and the second separator segment, or may be a median value of multiple thickness point values ​​obtained by the detection component 40 on at least one of the second electrode segment and the second separator segment. As an example, after the detection component 40 obtains multiple thickness point values ​​on at least one of the second electrode segment and the second separator segment, it first filters out obviously abnormal point values ​​and then calculates the average value or median value of the remaining multiple thickness point values.

[0184] In this way, the above technical solution can reduce the misalignment deviation of the tabs between multiple formed electrode assemblies, thereby improving the alignment of the tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assemblies.

[0185] In some embodiments, the step of feedback regulating the winding device 300 for winding the pole piece and the spacer includes:

[0186] The winding device 300 is adjusted according to first thickness information A1 of one of two adjacent electrode assemblies during the winding process and second thickness information A2 of the other of the two adjacent electrode assemblies during the winding process.

[0187] In this way, during the manufacturing process of the electrode assembly, after the manufacturing of the previous electrode assembly is completed, the winding parameters of the next electrode assembly can be adjusted in time, which is beneficial to improving the product yield of the entire electrode assembly manufacturing production line.

[0188] In some embodiments, adjusting the winding device 300 according to first thickness information A1 of one of two adjacent electrode assemblies during the winding process and second thickness information A2 of the other of the two adjacent electrode assemblies during the winding process includes:

[0189] The circumference L of the winding needle of the winding device 300 is adjusted according to the first thickness information A1 and the second thickness information A2.

[0190] For example, when the second thickness information A2 is greater than the first thickness information A1, the circumference of the winding needle of the winding device 300 can be reduced; when the second thickness information A2 is less than the first thickness information A1, the circumference of the winding needle of the winding device 300 can be increased.

[0191] By adjusting the circumference L of the winding needle of the winding device 300, the process is simple and the operation is convenient, which can reduce the overall manufacturing difficulty of the electrode assembly and is conducive to further improving the product yield of the electrode assembly.

[0192] In some embodiments, the first thickness information A1, the second thickness information A2, and the circumference L of the winding needle of the winding device 300 satisfy the relationship: A2-A1=N*L, where N is the number of winding turns.

[0193] For example, the number of winding turns N is a preset value, and the circumference L of the winding needle can be determined by the difference between the second thickness information A2 and the first thickness information A1 and the number of winding turns N. Thus, after the previous electrode assembly is manufactured, the winding needle of the winding device 300 is adjusted according to the circumference L of the winding needle, and then the electrode sheet and separator are wound to form the next electrode assembly.

[0194] Optionally, the winding number N may be in the range of 10 to 80. For example, the winding number N may be, but is not limited to, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 75, 80, etc., and may be selected according to the actual application environment.

[0195] By adjusting the circumference of the winding needle of the winding device 300 using the above formula, it is possible to improve the adjustment accuracy while reducing the calculation complexity.

[0196] In some embodiments, adjusting the winding device 300 according to first thickness information A1 of one of two adjacent electrode assemblies during the winding process and second thickness information A2 of the other of the two adjacent electrode assemblies during the winding process includes:

[0197] The pressure Q of the embossing roller of the winding device 300 is adjusted according to the first thickness information A1 and the second thickness information A2.

[0198] For example, when the second thickness information A2 is greater than the first thickness information A1, the pressure Q of the embossing roller of the winding device 300 can be reduced; when the second thickness information A2 is less than the first thickness information A1, the pressure Q of the embossing roller of the winding device 300 can be increased.

[0199] By adjusting the pressure Q of the embossing roller of the winding device 300, the alignment of the tabs between multiple formed electrode assemblies can be improved while having little impact on the dimensions of the multiple electrode assemblies, thereby facilitating improved product consistency of the electrode assemblies.

[0200] In some embodiments, the first thickness information A1, the second thickness information A2 and the pressure Q of the embossing roller of the winding device 300 satisfy the relationship: A2-A1=N*L+b*Q, where N is the number of winding turns, L is the circumference of the winding needle, and b is a constant coefficient.

[0201] For example, in the above formula, the number of winding turns N and the circumference L of the winding needle are both preset values, and b is a constant coefficient. The pressure Q of the embossing roller of the winding device 300 can be determined based on the difference between the second thickness information A2 and the first thickness information A1, the number of winding turns N, and the circumference L of the winding needle. Thus, after the previous electrode assembly is completed, the embossing roller of the winding device 300 is adjusted based on the pressure Q of the embossing roller, and then the electrode sheet and separator are wound to form the next electrode assembly.

[0202] Optionally, the value range of b may be 1 to 3. For example, b may be, but is not limited to, 1, 1.5, 2, 2.5, 3, etc., and may be selected according to the actual application environment.

[0203] Optionally, the winding number N may be in the range of 10 to 80. For example, the winding number N may be, but is not limited to, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 75, 80, etc., and may be selected according to the actual application environment.

[0204] Optionally, the circumference L of the winding needle may range from 100 mm to 700 mm. For example, the circumference L of the winding needle may be, but is not limited to, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 550 mm, 600 mm, 650 mm, 700 mm, etc., and may be selected according to the actual application environment.

[0205] By adjusting the embossing roller of the winding device 300 using the above formula, it is possible to improve the adjustment accuracy while reducing the calculation complexity.

[0206] In order to better understand the material detection device 400 provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned material detection device 400 in actual application is provided here for illustration.

[0207] The present application provides a strip material detection device 400, which includes a mounting frame 10, a first roller 20, a second roller 30, two guide rods 50, a detection component 40, and an adjustment component 70. The first roller 20 is connected to the mounting frame 10 and can rotate about a first axis 21. The second roller 30 is connected to the mounting frame 10 and can rotate about a second axis 31. The first axis 21 is parallel to the second axis 31. A channel for the strip material to pass through is formed between the first roller 20 and the second roller 30. The second roller 30 can move toward or away from the first roller 20 along a first direction X.

[0208] Two guide rods 50 are respectively disposed at both ends of the second roller 30 in a direction parallel to the second axis 31. The mounting frame 10 is provided with a guide hole 11 that extends through the mounting frame 10 in the first direction X. The guide rods 50 are disposed in the guide hole 11 and are movably connected to the mounting frame 10 in the first direction X. The guide rods 50 are fixed to the second roller 30, with the ends of the guide rods 50 distal from the second roller 30 extending out of the guide hole 11. A limit member 60 is disposed on the ends of the guide rods 50 distal from the second roller 30. The guide rods 50 are configured to move in the first direction X when an external force applied thereto reaches a first threshold.

[0209] The detection component 40 is connected to the second roller 30 and is used to detect the displacement of the second roller 30 along the first direction X. The detection frequency S of the detection component 40 satisfies the relationship: 200 times / second ≤ S ≤ 1000 times / second. The detection component 40 includes a first detection member 41 and a second detection member 42, which are respectively disposed at opposite ends of the second roller 30 along a direction parallel to the second axis 31. The adjustment component 70 is in communication with the detection component 40 and is used to obtain thickness information from the detection component 40 and adjust the target device for winding the strip based on the thickness information.

[0210] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A strip material detection device, comprising: A mounting frame; A first roller, connected to the mounting frame, and the first roller can rotate around a first axis; A second roller, connected to the mounting frame and capable of rotating around a second axis, the first axis being parallel to the second axis, a channel for the strip material to pass through is formed between the first roller and the second roller, and the second roller can approach or move away from the first roller along a first direction; A detection component, configured to detect the displacement of the second roller along the first direction.

2. The strip material detection device according to claim 1, wherein, The detection component includes a first detection piece and a second detection piece, and the first detection piece and the second detection piece are respectively arranged at two ends of the second roller along the direction parallel to the second axis.

3. The strip material detection device according to claim 1, wherein, The strip material detection device further includes a guide rod, the mounting frame is provided with a guide hole, and the guide rod passes through the guide hole and is movably connected to the mounting frame along the first direction; The guide rod is fixed to the second roller.

4. The strip material detection device according to claim 3, wherein The guide rod is configured to be able to move along the first direction when the external force applied thereto reaches a first threshold.

5. The strip material detection device according to claim 4, wherein, The guide rod is frictionally connected to the hole wall of the guide hole.

6. The strip material detection device according to claim 3, wherein, The guide hole penetrates the mounting frame along the first direction.

7. The strip material detection device according to claim 6, wherein, One end of the guide rod away from the second roller extends out of the guide hole, and a limiting piece is arranged at one end of the guide rod away from the second roller.

8. The strip material detection device according to claim 3, wherein, The number of the guide rods is two, and the two guide rods are respectively arranged at two ends of the second roller along the direction parallel to the second axis.

9. The strip material detection device according to claim 1, wherein, The strip material detection device further includes an adjustment component, the adjustment component is communicatively connected to the detection component, and the adjustment component is configured to obtain the thickness information of the detection component and adjust a target device for winding the strip material according to the thickness information.

10. The strip material detection device according to claim 1, wherein, The strip material detection device further includes a support component, the support component is connected between the mounting frame and the second roller, and the support component can apply a force to the second roller to approach the first roller.

11. The strip material detection device according to claim 10, wherein, The support component is an elastic piece.

12. The strip material detection device according to claim 1, wherein, The detection frequency S of the detection component satisfies the relationship: 200 times / second ≤ S ≤ 1000 times / second.

13. A winding device, comprising: A pole piece unwinding device, configured to provide a pole piece; An isolation piece unwinding device, configured to provide an isolation piece; A winding device, configured to wind the pole piece and the isolation piece; And The strip material detection device according to any one of claims 1-12, arranged upstream of the winding device, and at least one of the isolation piece and the pole piece passes between the first roller and the second roller.

14. The winding device according to claim 13, wherein, Two strip material detection devices are provided, and two pole piece unwinding devices are provided; The pole pieces provided by the two pole piece unwinding devices are configured to respectively pass between the first roller and the second roller of the two strip material detection devices.

15. The winding device according to claim 13, wherein, Four strip material detection devices are provided, two pole piece unwinding devices are provided, and two isolation piece unwinding devices are provided; The pole pieces provided by the two pole piece unwinding devices are configured to respectively pass between the first roller and the second roller of the two strip material detection devices; The separators provided by the two separator unwinding devices are configured to pass through between the first roller and the second roller of the other two strip detection devices respectively.

16. The winding device according to claim 13, wherein, There are two strip detection devices, two electrode strip unwinding devices, and two separator unwinding devices; The electrode strip provided by one electrode strip unwinding device and the separator provided by one separator unwinding device are configured to commonly pass through between the first roller and the second roller of one strip detection device; The electrode strip provided by the other electrode strip unwinding device and the separator provided by the other separator unwinding device are configured to commonly pass through between the first roller and the second roller of the other strip detection device.

17. The winding device according to claim 13, wherein There are two strip detection devices, two electrode strip unwinding devices, and two separator unwinding devices; The electrode strip provided by one electrode strip unwinding device and the separators provided by the two separator unwinding devices are configured to commonly pass through between the first roller and the second roller of one strip detection device; The electrode strip provided by the other electrode strip unwinding device is configured to pass through between the first roller and the second roller of the other strip detection device.

18. The winding device according to claim 13, wherein There is one strip detection device, two electrode strip unwinding devices, and two separator unwinding devices; The electrode strips provided by the two electrode strip unwinding devices and the separators provided by the two separator unwinding devices are configured to commonly pass through between the first roller and the second roller of one strip detection device.

19. A method for manufacturing an electrode assembly, comprising: providing an electrode strip and a separator; winding the electrode strip and the separator of a predetermined size, and then cutting the electrode strip and the separator to form an electrode assembly; winding again to manufacture a plurality of the electrode assemblies; during the winding process, measuring the thickness information of at least one of the electrode strip and the separator, and feedback-adjusting the winding device for winding the electrode strip and the separator; wherein, the thickness information is measured by using the strip detection device according to any one of claims 1-12.

20. The manufacturing method of the electrode assembly according to claim 19, wherein, The step of feedback-adjusting the winding device for winding the electrode strip and the separator includes: adjusting the winding device according to the first thickness information A1 of one of the two adjacent electrode assemblies during the winding process and the second thickness information A2 of the other during the winding process.

21. The manufacturing method of the electrode assembly according to claim 20, wherein, The adjusting the winding device according to the first thickness information A1 of one of the two adjacent electrode assemblies during the winding process and the second thickness information A2 of the other during the winding process includes: adjusting the circumference L of the winding needle of the winding device according to the first thickness information A1 and the second thickness information A2.

22. The manufacturing method of the electrode assembly according to claim 21, wherein, A relationship is satisfied among the first thickness information A1, the second thickness information A2, and the circumference L of the winding needle of the winding device: A2 - A1 = N*L, where N is the number of winding turns.

23. The manufacturing method of the electrode assembly according to claim 20, wherein, Adjusting the winding device according to the first thickness information A1 of one of two adjacent electrode assemblies during winding and the second thickness information A2 of the other during winding includes: Adjusting the pressure Q of the embossing roller of the winding device according to the first thickness information A1 and the second thickness information A2.

24. The manufacturing method of the electrode assembly according to claim 23, wherein, A relationship is satisfied among the first thickness information A1, the second thickness information A2, and the pressure Q of the embossing roller of the winding device: A2 - A1 = N * L + b * Q, where N is the number of winding turns, L is the circumference of the winding needle, and b is a constant coefficient.

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