Tape detection device, winding device, and method for manufacturing electrode assembly

Abstract

The invention provides a strip detection device, winding equipment and a manufacturing method of an electrode assembly. The strip detection device comprises a mounting frame, a first roller, a second roller and a detection part, and the first roller is connected to the mounting frame and can rotate around a first axis. The second roller is connected to the mounting frame and can rotate around a second axis, the first axis is parallel to the second axis, a channel for the strip to pass through is formed between the first roller and the second roller, and the second roller can get close to or get away from the first roller in the first direction. The detection part is used for detecting displacement of the second roller in the first direction. According to the invention, the product yield of the electrode assembly can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a strip material detection device, a winding device, and a manufacturing method of an electrode assembly. Background Art

[0002] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the manufacturing process of batteries, the preparation of electrode assemblies is crucial, and the product yield of electrode assemblies will directly affect the economic benefits of batteries. Therefore, how to effectively improve the product yield of electrode assemblies is an urgent problem to be solved in battery technology. Summary of the Invention

[0004] 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 electrode assemblies.

[0005] In a first aspect, an embodiment of the present application provides a strip material detection device, which 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 around a first axis. The second roller is connected to the mounting frame and can rotate around a second axis. The first axis is parallel to the second axis. A channel for the strip material to pass through is formed between the first roller and the second roller. The second roller can move closer to or away from the first roller in a first direction. The detection component is used to detect the displacement of the second roller in the first direction.

[0006] The strip material detection device can obtain the thickness information of at least one of the pole piece and the separator during the preparation of the electrode assembly, and perform corresponding adjustments on the winding device for winding the pole piece and the separator according to the thickness information, so as to reduce the ear misalignment deviation between multiple formed electrode assemblies, thereby improving the alignment degree of the ears between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0007] In some embodiments of the first aspect, 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 both ends of the second roller in a direction parallel to the second axis. It can improve the accuracy of the detection component in obtaining the thickness information of the strip material.

[0008] In some embodiments of the first aspect, the strip material detection device further includes a guide rod. The mounting frame is provided with a guide hole. The guide rod passes through the guide hole and is movably connected to the mounting frame in the first direction. The guide rod is fixed to the second roller.

[0009] 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, reduce the deviation between the displacement of the second roller along the first direction and the thickness of the strip material, and thus improve the accuracy of the detection component in obtaining the thickness information of the strip material.

[0010] In some embodiments of the first aspect, the guide rod is configured to be able to move along the first direction when the external force applied reaches the first threshold.

[0011] The above technical solution can improve the stability of the guide rod, reduce the risk of accidental movement of the guide rod, and thus improve the accuracy of the detection component in obtaining the thickness information of the strip material.

[0012] In some embodiments of the first aspect, the guide rod is in frictional connection with the hole wall of the guide hole.

[0013] The above technical solution realizes the adjustment of the first threshold to adapt to different application environments by setting the frictional connection between the guide rod and the hole wall of the guide hole and taking the value corresponding to the maximum static friction force between the guide rod and the hole wall of the guide hole as the first threshold. The structure is simple, which is beneficial to reducing the overall preparation difficulty and cost of the battery module.

[0014] In some embodiments of the first aspect, the guide hole penetrates the mounting bracket along the first direction. This can increase the movement range of the guide rod along the first direction, and further increase the detection range of the strip material thickness, thus improving the applicability of the strip material detection device.

[0015] In some embodiments of the first aspect, the end of the guide rod away from the second roller extends out of the guide hole, and a limiting member is provided at the end of the guide rod away from the second roller. The limiting member can limit the displacement of the guide rod in the direction close to the first roller, thereby reducing the risk of accidental detachment of the guide rod.

[0016] In some embodiments of the first aspect, the number of guide rods is two, and the two guide rods are respectively arranged at both ends of the second roller along the direction parallel to the second axis. This can further improve the stability of the movement along the first direction.

[0017] In some embodiments of the first aspect, the strip material detection device further includes an adjustment component, which is communicatively connected with the detection component. The adjustment component is used to obtain the thickness information of the detection component and adjust the target device for winding the strip material according to the thickness information.

[0018] Thus, through the above technical solution, by setting the adjusting component, the strip material detection device can 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 automation degree of the strip material detection device, reduce manual intervention, and is beneficial to cost reduction.

[0019] In some embodiments of the first aspect, the strip material detection device further includes a support component, which is connected between the mounting frame and the second roller. The support component can apply a force to the second roller to approach the first roller. It can improve the stability of the second roller, reduce the risk of accidental movement of the second roller, and thus can further improve the accuracy of the detection component in obtaining the thickness information of the strip material. Among them, the support component can deform or expand along the first direction according to the magnitude of the external force it receives.

[0020] In some embodiments of the first aspect, the support component is an elastic member. The elastic member can undergo self-adaptive elastic deformation according to the magnitude of the external force it receives. The structure is simple. While improving the stability of the second roller, it is beneficial to cost reduction.

[0021] In some embodiments of the first aspect, the 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, it can meet the measurement accuracy requirements while reducing the overall cost of the strip material detection device.

[0022] In the second aspect, the present application provides a winding device, which includes a pole piece unwinding device, an insulating member unwinding device, a winding device, and the strip material detection device provided in any embodiment of the first aspect. The pole piece unwinding device is used to provide pole pieces, the insulating member unwinding device is used to provide insulating members, the winding device is used to wind the pole pieces and the insulating members, the strip material detection device is arranged upstream of the winding device, and at least one of the insulating member and the pole piece passes between the first roller and the second roller.

[0023] The strip material detection device can obtain the thickness information of at least one of the pole piece and the insulating member during the process of preparing the electrode assembly, and perform corresponding adjustment on the winding device for winding the pole piece and the insulating member according to the thickness information, so as to reduce the pole ear misalignment deviation between multiple formed electrode assemblies, thereby improving the alignment degree of the pole ears between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0024] 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.

[0025] Thus, the above technical solution can improve the adjustment accuracy of the tab positions between the formed electrode assemblies by jointly adjusting the winding device according to the thickness information of the first electrode tab and the thickness information of the second electrode tab, and further improve the product yield of the electrode assemblies.

[0026] In some embodiments of the second aspect, four strip detection devices are provided, two electrode tab unwinding devices, and two separator unwinding devices. The electrode tabs provided by the two electrode tab unwinding devices are configured to pass between the first roller and the second roller of two of the strip detection devices respectively. The separators provided by the two separator unwinding devices are configured to pass between the first roller and the second roller of the other two strip detection devices respectively.

[0027] Thus, the above technical solution can further improve the adjustment accuracy of the tab positions between the formed electrode assemblies by jointly adjusting the winding device according to the thickness information of the first electrode tab, the thickness information of the second electrode tab, the thickness information of the first separator, and the thickness information of the second separator, and further improve the product yield of the electrode assemblies.

[0028] In some embodiments of the second aspect, two strip detection devices are provided, two electrode tab unwinding devices, and two separator unwinding devices. The electrode tab provided by one electrode tab unwinding device and the separator provided by one separator unwinding device are configured to jointly pass between the first roller and the second roller of one of the strip detection devices. The electrode tab provided by the other electrode tab unwinding device and the separator provided by the other separator unwinding device are configured to jointly pass between the first roller and the second roller of the other strip detection device.

[0029] Thus, the above technical solution can jointly adjust the winding device according to the thickness information of the first composite strip and the thickness information of the second composite strip. Compared with single-strip materials such as electrode tabs or separators, the first composite strip and the second composite strip have relatively greater rigidity. Therefore, the deformation amount generated when the first composite strip and the second composite strip pass between the first roller and the second roller of the strip detection device will be relatively small, which can reduce the data fluctuation during the measurement of the strip detection device, thereby further improving the adjustment accuracy of the tab positions between the formed electrode assemblies, and further improving the product yield of the electrode assemblies.

[0030] In some embodiments of the second aspect, two strip detection devices are provided, two electrode tab unwinding devices, and two separator unwinding devices. The electrode tab provided by one electrode tab unwinding device and the separators provided by two separator unwinding devices are configured to jointly pass between the first roller and the second roller of one of the strip detection devices. The electrode tab provided by the other electrode tab unwinding device is configured to pass between the first roller and the second roller of the other strip detection device.

[0031] Thus, in the above technical solution, the winding device is adjusted accordingly based on the thickness information of the third composite strip and the thickness information of the second pole piece. Since the third composite strip has greater rigidity, the amount of deformation generated when the third composite strip passes between the first roller and the second roller of the strip detection device is smaller, which can reduce the data fluctuation during the measurement of the strip detection device. At the same time, the thickness information of the second pole piece is closer to the true thickness change of the pole piece strip. Therefore, the combination of the thickness information of the third composite strip and the thickness information of the second pole piece can make the thickness data have the advantages of small fluctuation and high reducibility.

[0032] In some embodiments of the second aspect, one strip detection device is provided, two pole piece unwinding devices are provided, and two separator unwinding devices are provided. The pole pieces provided by the two pole piece unwinding devices and the separators provided by the two separator unwinding devices are configured to jointly pass between the first roller and the second roller of one strip detection device.

[0033] Thus, in the above technical solution, the winding device is adjusted accordingly based on the thickness information of the fourth composite strip. Since the fourth composite strip has greater rigidity, the amount of deformation generated when the fourth composite strip passes between the first roller and the second roller of the strip detection device is smaller, which can reduce the data fluctuation and error during the measurement of the strip detection device. Thereby, the adjustment accuracy of the tab position between the formed electrode assemblies can be further improved, and further, the product yield of the electrode assemblies can be further improved.

[0034] In a third aspect, the present application provides a method for manufacturing an electrode assembly. The method for manufacturing an electrode assembly includes:

[0035] Providing a pole piece and a separator;

[0036] Winding the pole piece and the separator of a predetermined size, and then cutting the pole piece and the separator to form an electrode assembly;

[0037] Winding again to manufacture a plurality of electrode assemblies;

[0038] During the winding process, measuring the thickness information of at least one of the pole piece and the separator, and feedback-adjusting the winding device for winding the pole piece and the separator;

[0039] Wherein, the thickness information is measured using the strip detection device according to any one of claims 1-12.

[0040] Thus, the above technical solution can reduce the tab misalignment deviation 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.

[0041] In some embodiments of the third aspect, the steps of feedback regulating the winding device for the wound pole piece and the separator include:

[0042] Adjusting the winding device according to the first thickness information A1 of one of two adjacent electrode assemblies during the winding process and the second thickness information A2 of the other during the winding process.

[0043] In this way, during the manufacturing process of the electrode assembly, after the previous electrode assembly is manufactured, the winding parameters of the subsequent electrode assembly can be adjusted in a timely manner, which is conducive to improving the product yield of the entire electrode assembly manufacturing production line.

[0044] In some embodiments of the third aspect, adjusting the winding device according to the first thickness information A1 of one of two adjacent electrode assemblies during the winding process and the second thickness information A2 of the other during the winding process includes:

[0045] 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.

[0046] By adjusting the circumference L of the winding needle of the winding device, the process is simple and the operation is convenient. It can reduce the overall manufacturing difficulty of the electrode assembly and is conducive to further improving the product yield of the electrode assembly.

[0047] In some embodiments of the third aspect, the relationship between the first thickness information A1, the second thickness information A2, and the circumference L of the winding needle of the winding device is: A2 - A1 = N * L, where N is the number of winding turns. By adjusting the circumference of the winding needle of the winding device through the above formula, the adjustment accuracy can be improved while reducing the calculation complexity.

[0048] In some embodiments of the third aspect, adjusting the winding device according to the first thickness information A1 of one of two adjacent electrode assemblies during the winding process and the second thickness information A2 of the other during the winding process includes:

[0049] 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.

[0050] By adjusting the pressure Q of the embossing roller of the winding device, the alignment accuracy of the tabs between multiple formed electrode assemblies can be improved while having a small impact on the dimensions between multiple electrode assemblies, which is conducive to improving the product consistency of the electrode assembly.

[0051] In some embodiments of the third aspect, 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 pin, and b is a constant coefficient. By adjusting the embossing roller of the winding device through the above formula, the adjustment accuracy can be improved while reducing the calculation complexity.

[0052] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of this application more obvious and understandable, the following specifically illustrates the specific embodiments of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0054] Figure 1 is a schematic structural diagram of a strip detection device provided by some embodiments of this application;

[0055] Figure 2 is a schematic structural diagram of a winding device provided by some embodiments of this application;

[0056] Figure 3 is a schematic structural diagram of another winding device provided by some embodiments of this application;

[0057] Figure 4 is a schematic structural diagram of yet another winding device provided by some embodiments of this application;

[0058] Figure 5 is a schematic structural diagram of still another winding device provided by some embodiments of this application;

[0059] Figure 6 is a schematic structural diagram of still yet another winding device provided by some embodiments of this application;

[0060] Figure 7 is a schematic flowchart of a preparation method for an electrode assembly provided by some embodiments of this application.

[0061] The reference numerals in the specific embodiments are as follows:

[0062] 100, Electrode Unwinding Device; 200, Separator Unwinding Device; 300, Winding Device; 400, Strip Material Detection Device; 500, First Connection Component; 600, Second Connection Component; 700, Third Connection Component; 800, Fourth Connection Component;

[0063] 10, Mounting Frame; 11, Guide Hole; 20, First Roller; 21, First Axis; 30, Second Roller; 31, Second Axis; 40, Detection Component; 41, First Detection Piece; 42, Second Detection Piece; 50, Guide Rod; 60, Limiting Piece; 70, Adjusting Component; 80, Support Component; X, First Direction. Detailed Implementation Manner

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0066] Referring to the "embodiment" in the present application means that a specific feature, structure, or characteristic described in combination with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0067] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", and "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0068] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0069] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0070] The term "plurality" used in the present application refers to two or more (including two).

[0071] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0072] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0073] In the manufacturing process of batteries, the preparation of electrode assemblies is crucial, and the product yield of electrode assemblies will directly affect the economic benefits of batteries. At present, winding devices are usually used to wind pole piece strips and separator strips to form electrode assemblies. In this process, the thickness deviation of the pole piece strips and separator strips affects the product yield of the electrode assemblies. For example, multiple electrode assemblies after forming are prone to misalignment of the pole ears, resulting in a high scrap rate of the electrode assemblies, which in turn affects the product yield of the electrode assemblies, resulting in poor economic benefits of the battery.

[0074] Based on the above considerations, the inventor has designed a belt material detection device after in-depth research. The belt 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 around a first axis. The second roller is connected to the mounting frame and can rotate around a second axis. The first axis is parallel to the second axis. A channel for the belt material to pass through is formed between the first roller and the second roller. The second roller can approach or move away from the first roller along the first direction. The detection component is used to detect the displacement of the second roller along the first direction.

[0075] Thus, by providing a strip material detection device, the strip material detection device can obtain the thickness information of at least one of the pole piece and the separator during the process of preparing the electrode assembly, and accordingly adjust the winding device for the wound pole piece and the separator based on the thickness information, so as to reduce the tab misalignment deviation between multiple formed electrode assemblies, thereby improving the alignment degree of the tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0076] The technical solutions described in the embodiments of the present application can be applied to pole pieces and separator films, and can also be used for other strip materials. Among them, the pole piece can be a positive pole piece or a negative pole piece.

[0077] In some embodiments, the positive electrode sheet may include a positive current collector and a positive active material provided on at least one surface of the positive current collector.

[0078] As an example, the positive current collector has two surfaces opposite to each other in its own thickness direction, and the positive active material is provided on any one or both of the two opposite surfaces of the positive current collector.

[0079] As an example, the positive current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver surface-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0080] As an example, the positive active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive active materials can also be used. These positive active materials can be used alone or in combination of two or more.

[0081] In some embodiments, the positive electrode can be made of carbon foam or metal foam. The metal foam can be nickel foam, copper foam, aluminum foam or alloy foam, etc. When the metal foam is used as the positive electrode, the positive active material may not be provided on the surface of the metal foam, and of course, the positive active material can also be provided. As an example, a lithium source material, potassium metal or sodium metal can also be filled and / or deposited in the metal foam, and the lithium source material is lithium metal and / or lithium-rich material.

[0082] In some embodiments, the negative electrode sheet may include a negative current collector.

[0083] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with a silver surface treatment, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0084] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0085] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0086] As an example, the negative electrode active material can be a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc.

[0087] In some embodiments, the negative electrode can be made of foam carbon or foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, or foam alloy, etc. When the foam metal is used as the negative electrode sheet, the negative electrode active material may not be provided on the surface of the foam metal, and of course, the negative electrode active material can also be provided.

[0088] As an example, a lithium source material, potassium metal, or sodium metal can also be filled and / or deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0089] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0090] In some embodiments, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0091] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described electrode sheets and separators, but can also be applied to all strip materials. However, for the sake of simplicity of description, the following embodiments are all described by taking the electrode sheets and separators as examples.

[0092] Figure 1 It is a schematic structural diagram of a strip material detection device provided in some embodiments of the present application.

[0093] As Figure 1As shown in the figure, an embodiment of the present application provides a strip detection device 400. The strip 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 around a first axis 21. The second roller 30 is connected to the mounting frame 10 and can rotate around a second axis 31. The first axis 21 is parallel to the second axis 31. A channel for the strip to pass through is formed between the first roller 20 and the second roller 30. The second roller 30 can move closer to or 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.

[0094] Exemplarily, the first roller 20 can be detachably connected to the mounting frame 10 or fixedly arranged on the mounting frame 10. The first roller 20 can be directly connected to the mounting frame 10 or restricted on the mounting frame 10 through other components. As an example, the connection manner between the first roller 20 and the mounting frame 10 can be but not limited to welding, bolt connection, snap connection, or riveting, etc.

[0095] As an example, the first roller 20 can include a first connecting shaft and a first roller barrel. The first connecting shaft is fixedly connected to the mounting frame 10, and the first roller barrel 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 coincides with the axis of the first roller barrel.

[0096] Exemplarily, the second roller 30 can be detachably connected to the mounting frame 10 or fixedly arranged on the mounting frame 10. The second roller 30 can be directly connected to the mounting frame 10 or restricted on the mounting frame 10 through other components. As an example, the connection manner between the second roller 30 and the mounting frame 10 can be but not limited to welding, bolt connection, snap connection, or riveting, etc.

[0097] As an example, the second roller 30 can include a second connecting shaft and a second roller barrel. The second connecting shaft is fixedly connected to the mounting frame 10, and the second roller barrel 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 coincides with the axis of the second roller barrel.

[0098] Exemplarily, the second roller 30 is opposite to the first roller 20 along the first direction X, and a channel for the strip to pass through has been formed between the first roller 20 and the second roller 30. The first direction X can be understood as the thickness direction of the strip. Among them, the strip can be at least one of a pole piece and a separator.

[0099] The second roller 30 is movably connected to the mounting bracket 10, and the second roller 30 can move closer to 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 apply a supporting force away from the first roller 20 to the second roller 30, so that the second roller 30 moves in the direction away from the first roller 20. Among them, since the thicknesses of different positions of the strip are different, the magnitudes of the supporting forces applied by different positions of the strip to the second roller 30 away from the first roller 20 will also be different. It can be understood that the greater the thickness of the strip, the greater the supporting force applied by the strip to the second roller 30; the smaller the thickness of the strip, the smaller the supporting force applied by the strip to the second roller 30.

[0100] It should be noted that when the strip does not pass between the first roller 20 and the second roller 30, in other words, when the strip 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.

[0101] Exemplarily, the detection component 40 may be a displacement sensor, which can detect the displacement of the second roller 30 along the first direction X. During the process of the strip passing between the first roller 20 and the second roller 30, according to the change of the displacement of the second roller 30 along the first direction X, the thickness information of the strip can be obtained.

[0102] 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 may be fixedly arranged on the second roller 30. The detection component 40 may be directly connected to the second roller 30, or may be restricted on the second roller 30 through other components. As an example, the connection manner between the detection component 40 and the second roller 30 may be, but is not limited to, welding, bolt connection, snap connection, or riveting, etc.

[0103] Exemplarily, during the process of manufacturing the electrode assembly, before winding the pole piece and the separator, the strip detection device 400 can measure the thickness of at least one of the pole piece and the separator to obtain the thickness information, and then adjust the winding device for winding the pole piece and the separator accordingly according to the thickness information, so as to correct the position of the tab of the formed electrode assembly. At the same time, the strip detection device 400 can also detect defective products in the pole piece or the separator. It should be noted that if the pole piece or the separator does not meet the manufacturing requirements, a defective product label will be attached to the pole piece or the separator. The defective product label itself has a certain thickness. When the pole piece or the separator with the defective product label passes between the first roller 20 and the second roller 30 of the strip detection device 400, the thickness data detected by the detection component 40 will show a sudden change, so that the pole piece or the separator that does not meet the manufacturing requirements can be identified and the pole piece or the separator that does not meet the manufacturing requirements can be removed.

[0104] 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, etc.

[0105] Optionally, the thickness information may be the average value of multiple thickness point values on the pole piece forming an electrode assembly, and the winding device is adjusted according to the average value of the multiple thickness point values; the thickness information may also be the median value of the multiple thickness point values on the pole piece forming an electrode assembly, and the winding device is adjusted according to the median value of the multiple thickness point values. This can reduce the adjustment error and improve the adjustment accuracy. As an example, after the detection component 40 obtains multiple thickness point values, it first filters out the obviously abnormal point values, and then takes the average value or the median value of the remaining multiple thickness point values.

[0106] As an example, first provide the first pole piece and the first separator. The strip material detection device 400 measures the thickness of at least one of the first pole piece and the first separator, and obtains the first thickness information, and winds the first pole piece and the first separator to form the first electrode assembly. Then continue to provide the second pole piece and the second separator. The strip material detection device 400 measures the thickness of at least one of the second pole piece and the second separator, and obtains the second thickness information. The winding device is adjusted according to the first thickness information and the second thickness information. After adjustment, the winding device winds the second pole piece and the second separator to form the second electrode assembly. Among them, the first pole piece and the second pole piece may be continuous, and the first separator and the second separator may 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 adjusted smaller or the pressure of the embossing roller of the winding device can be adjusted smaller, and then the second pole piece and the second separator are wound to form the 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 adjusted larger or the pressure of the embossing roller of the winding device can be adjusted larger, and then the second pole piece and the second separator are wound to form the second electrode assembly.

[0107] In this way, by setting the strip material detection device 400, the strip material detection device 400 can obtain the thickness information of at least one of the pole piece and the separator during the process of preparing the electrode assembly, and make corresponding adjustments to the winding device for winding the pole piece and the separator according to the thickness information, so as to reduce the tab misalignment deviation between multiple formed electrode assemblies, thereby improving the alignment degree of the tabs between multiple formed electrode assemblies, and further effectively improving the product yield of the electrode assembly.

[0108] In some embodiments, the detection component 40 includes a first detection piece 41 and a second detection piece 42, and the first detection piece 41 and the second detection piece 42 are respectively arranged at two ends of the second roller 30 along the direction parallel to the second axis 31.

[0109] Exemplarily, the first detection piece 41 and the second detection piece 42 can simultaneously detect the displacements of two ends of the second roller 30 along the 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 material.

[0110] In some embodiments, the strip 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 passes through the guide hole 11 and is movably connected to the mounting frame 10 along the first direction X. The guide rod 50 is fixed to the second roller 30.

[0111] Exemplarily, one end of the guide rod 50 is fixed to the second roller 30. The cooperation between the guide rod 50 and the guide hole 11 can limit the offset amount of the second roller 30 in the direction perpendicular to the first direction X during the movement of the second roller 30 along the first direction X, which can reduce the deviation between the displacement of the second roller 30 along the first direction X and the thickness of the strip material, and thus can improve the accuracy of the detection component 40 in obtaining the thickness information of the strip material.

[0112] Optionally, the guide rod 50 can be detachably connected to the second roller 30 or can be fixedly arranged on the second roller 30. The guide rod 50 can be directly connected to the second roller 30 or can be restricted on the second roller 30 through other components. As an example, the connection manner between the guide rod 50 and the second roller 30 can be but is not limited to welding, bolt connection, snap connection or riveting, etc.

[0113] In some embodiments, the guide rod 50 is configured to be able to move along the first direction X when the external force received reaches a first threshold.

[0114] Exemplarily, a pre-tightening force is provided between the guide rod 50 and the mounting frame 10 so that the guide rod 50 can move along the first direction X when the external force received reaches the first threshold, to improve the stability of the guide rod 50, and can reduce the risk that the guide rod 50 generates accidental movement due to the vibration of the strip material detection device 400, resulting in a large detection error of the strip material thickness. Wherein, the first threshold can be understood as the magnitude of the pre-tightening force.

[0115] Optionally, a nut may be provided on the guide rod 50. One end of the nut along the first direction X is connected to the mounting bracket 10, and the frictional force between the nut and the guide rod 50 provides a pre-tightening force for the guide rod 50. The maximum static frictional force between the nut and the guide rod 50 is configured as the first threshold value; alternatively, a counterweight may be provided on the guide rod 50. The counterweight can provide a force towards the first roller 20 for the guide rod 50, and the gravity of the counterweight provides a pre-tightening force for the guide rod 50. The gravity of the counterweight is configured as the first threshold value.

[0116] The above technical solution can improve the stability of the guide rod 50, reduce the risk of accidental movement of the guide rod 50, and thus improve the accuracy of the detection component 40 for obtaining the thickness information of the strip material.

[0117] In some embodiments, the guide rod 50 is frictionally connected to the inner wall of the guide hole 11.

[0118] Exemplarily, the guide rod 50 is frictionally connected to the inner wall of the guide hole 11. There is a static frictional force between the guide rod 50 and the inner wall of the guide hole 11, and the maximum static frictional force between the guide rod 50 and the inner wall of the guide hole 11 is configured as the first threshold value. When the strip material passes between the first roller 20 and the second roller 30, the strip material applies a supporting force away from the first roller 20 to the second roller 30. When the supporting force is greater than the maximum static frictional force between the guide rod 50 and the inner wall of the guide hole 11, the second roller 30 can move in the direction away from the first roller 20.

[0119] The above technical solution realizes the adjustment of the first threshold value to adapt to different application environments by setting the frictional connection between the guide rod 50 and the inner wall of the guide hole 11 and using the value corresponding to the maximum static frictional force between the guide rod 50 and the inner wall of the guide hole 11 as the first threshold value. The structure is simple, which is beneficial to reducing the overall preparation difficulty and cost of the battery module.

[0120] In some embodiments, the guide hole 11 penetrates through the mounting bracket 10 along the first direction X, which can increase the movement range of the guide rod 50 along the first direction X, and further increase the detection range of the strip material thickness, thereby improving the applicability of the strip material detection device 400.

[0121] In some embodiments, one end of the guide rod 50 away from the second roller 30 extends out of the guide hole 11, and a limiting member 60 is provided at the end of the guide rod 50 away from the second roller 30. The limiting 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 accidental detachment of the guide rod 50.

[0122] Optionally, the limiting member 60 can be detachably connected to the second roller 30 or fixedly arranged on the second roller 30. The limiting member 60 can be directly connected to the second roller 30 or restricted on the second roller 30 through other components. As an example, the connection method between the limiting member 60 and the second roller 30 can be, but is not limited to, welding, bolt connection, snap connection, or riveting, etc.

[0123] Optionally, the limiting member 60 can be, but is not limited to, a rod-shaped structure, a block-shaped structure, a sheet-shaped structure, etc.

[0124] Optionally, the number of the limiting members 60 can be one or more. As an example, when the number of the limiting members 60 is one, the limiting member 60 can be arranged to extend circumferentially along the guide rod 50; when the number of the limiting members 60 is multiple, the multiple limiting members 60 can be circumferentially spaced along the guide rod 50.

[0125] Optionally, the limiting member 60 and the guide rod 50 can be an integrally formed structure. On the one hand, there is no need to connect the limiting member 60 and the guide rod 50 through an additional connection process, which simplifies the manufacturing process flow. At the same time, compared with connecting the limiting member 60 and the guide rod 50 through an additional connection process, the integrally formed limiting member 60 and the guide rod 50 have higher connection firmness.

[0126] In some embodiments, the number of the guide rods 50 is two, and the two guide rods 50 are respectively arranged at both ends of the second roller 30 along the direction parallel to the second axis 31, which can further improve the stability of the inspection moving along the first direction X.

[0127] In some embodiments, the strip material detection device 400 further includes an adjustment component 70, and the adjustment component 70 is communicatively connected with the detection component 40. The adjustment component is used to obtain the thickness information of the detection component 40 and adjust the target device for winding the strip material according to the thickness information.

[0128] Exemplarily, when the strip material passes between the first roller 20 and the second roller 30, the detection component 40 measures the strip material and generates thickness information. The adjustment component 70 is communicatively connected with the detection component 40 to obtain the thickness information. The adjustment component 70 processes the thickness information. The adjustment component 70 can also be communicatively connected with the winding device to adjust the winding device according to the thickness information. Among them, the adjustment component 70 can be a computing chip.

[0129] In this way, the above technical solution can enable the strip material detection device 400 to measure the thickness of the strip material, automatically generate the thickness information, and automatically adjust the target device for winding the strip material according to the thickness information by setting the adjustment component 70, which can effectively improve the automation degree of the strip material detection device 400, reduce manual intervention, and is beneficial to cost reduction.

[0130] In some embodiments, the strip detection device 400 further includes a support member 80. The support member 80 is connected between the mounting bracket 10 and the second roller 30, and the support member 80 can apply a force to the second roller 30 to approach the first roller 20.

[0131] Exemplarily, the support member 80 is supported between the mounting bracket 10 and the second roller 30 to apply a force to the second roller 30 to approach the first roller 20, which can improve the stability of the second roller 30 and reduce the risk of accidental movement of the second roller 30, thereby further improving the accuracy of the detection component 40 to obtain the thickness information of the strip. Among them, the support member 80 can deform or expand and contract along the first direction X according to the magnitude of the external force it receives.

[0132] Optionally, the support member 80 can be detachably connected to the mounting bracket 10 and the second roller 30, or can be fixedly arranged on the mounting bracket 10 and the second roller 30. The support member 80 can be directly connected to the mounting bracket 10 and the second roller 30, or can be restricted on the mounting bracket 10 and the second roller 30 through other components. As an example, the connection method between the support member 80 and the mounting bracket 10 and the second roller 30 can be but is not limited to welding, bolt connection, snap connection, or riveting, etc.

[0133] In some embodiments, the support member 80 is an elastic member. The elastic member can undergo adaptive elastic deformation according to the magnitude of the external force it receives, with a simple structure, which is beneficial to reducing costs while improving the stability of the second roller 30.

[0134] Optionally, the elastic member can be but is not limited to a spring or a rubber plug, etc. As an example, when the elastic member is a spring, the spring can be sleeved on the guide rod 50; when the elastic member is a rubber plug, the rubber plug can be arranged at intervals with the guide rod 50 in a direction parallel to the second axis 31.

[0135] In some embodiments, the detection frequency S of the detection component 40 satisfies the relationship: 200 times / second ≤ S ≤ 1000 times / second.

[0136] Exemplarily, the detection frequency S of the detection component 40 can 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, such as 1000 times / second.

[0137] It can be understood that the higher the detection frequency S of the detection component 40, the higher the measurement accuracy of the strip detection device 400 for the strip; at the same time, the higher the performance requirements for the detection component 40, and the higher the cost of the strip detection device 400. The smaller the detection frequency S of the detection component 40, the lower the measurement accuracy of the strip detection device 400 for the strip; at the same time, the smaller the performance requirements for the detection component 40, and the lower the cost of the strip detection device 400.

[0138] In this way, by setting the detection frequency S of the detection component 40 within the above range, while meeting the measurement accuracy requirements, the overall cost of the strip detection device 400 can be reduced.

[0139] Figure 2 The structural schematic diagram of a winding device provided by some embodiments of the present application.

[0140] Continue to refer to Figure 2 According to some embodiments of the present application, the present application further provides a winding device. The winding device includes a pole piece unwinding device 100, an insulating member unwinding device 200, a winding device 300, and the strip detection device 400 of any of the above solutions. The pole piece unwinding device 100 is used to provide a pole piece, the insulating member unwinding device 200 is used to provide an insulating member, the winding device 300 is used to wind the pole piece and the insulating member, the strip detection device 400 is arranged upstream of the winding device 300, and at least one of the insulating member and the pole piece passes between the first roller 20 and the second roller 30.

[0141] Exemplarily, the pole piece unwinding device 100 and the insulating member unwinding device 200 are arranged in parallel, so that the pole piece provided by the pole piece unwinding device 100 and the insulating member provided by the insulating member unwinding device 200 jointly enter the winding device 300 for winding. The strip detection device 400 is arranged upstream of the winding device 300. Before the pole piece and the insulating member enter the winding device 300 for winding, at least one of the pole piece and the insulating member will first pass between the first roller 20 and the second roller 30 of the strip detection device 400. The strip detection device 400 measures the thickness of at least one of the pole piece and the insulating member to obtain thickness information, and then adjusts the winding device 300 accordingly to correct the position of the tab of the formed electrode assembly.

[0142] Optionally, the number of the pole piece unwinding devices 100 can be set to two. 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 the insulating member unwinding devices 200 can be set to two. The two insulating member unwinding devices 200 respectively provide a first insulating member and a second insulating member.

[0143] Optionally, the number of the strip detection devices 400 may be one, two, three, four or more, which can be selected according to the actual application environment.

[0144] In some embodiments, two strip detection devices 400 are provided, and two electrode strip unwinding devices 100 are provided. The electrode strips provided by the two electrode strip unwinding devices 100 are configured to pass between the first roller 20 and the second roller 30 of the two strip detection devices 400 respectively.

[0145] Exemplarily, the two electrode strip unwinding devices 100 respectively provide a first electrode strip and a second electrode strip, and the polarities of the first electrode strip and the second electrode strip are opposite. The first electrode strip passes between the first roller 20 and the second roller 30 of the two strip detection devices 400 before winding, and the strip detection device 400 measures the thickness of the first electrode strip to obtain the thickness information of the first electrode strip; the second electrode strip passes between the first roller 20 and the second roller 30 of the two strip detection devices 400 before winding, and the strip detection device 400 measures the thickness of the second electrode strip to obtain the thickness information of the second electrode strip.

[0146] In this way, the above technical solution can improve the adjustment accuracy of the tab positions between the formed electrode assemblies by jointly adjusting the winding device 300 according to the thickness information of the first electrode strip and the thickness information of the second electrode strip, and further improve the product yield of the electrode assemblies.

[0147] Figure 3 FIG. is a schematic structural diagram of another winding device provided by some embodiments of the present application.

[0148] Continue to refer to Figure 3 , in some embodiments, four strip detection devices 400 are provided, two electrode strip unwinding devices 100 are provided, and two separator unwinding devices 200 are provided. The electrode strips provided by the two electrode strip unwinding devices 100 are configured to pass between the first roller 20 and the second roller 30 of the two strip detection devices 400 respectively. The separators provided by the two separator unwinding devices 200 are configured to pass between the first roller 20 and the second roller 30 of the other two strip detection devices 400 respectively.

[0149] Exemplarily, two electrode strip unwinding devices 100 respectively provide a first electrode strip and a second electrode strip, the polarities of the first electrode strip and the second electrode strip are opposite, the number of separator strip unwinding devices 200 can be set to two, and the two separator strip unwinding devices 200 respectively provide a first separator and a second separator. Before winding, the first electrode strip and the second electrode strip respectively pass between the first roller 20 and the second roller 30 of two strip detection devices 400. One of the strip detection devices 400 measures the thickness of the first electrode strip to obtain the thickness information of the first electrode strip, and the other strip detection device 400 measures the thickness of the second electrode strip to obtain the thickness information of the second electrode strip; before winding, the first separator and the second separator respectively pass between the first roller 20 and the second roller 30 of two strip detection devices 400. One of the strip detection devices 400 measures the thickness of the first separator to obtain the thickness information of the first separator, and the other strip detection device 400 measures the thickness of the second separator to obtain the thickness information of the second separator.

[0150] In this way, through the above technical solution, by jointly adjusting the winding device 300 according to the thickness information of the first electrode strip, the thickness information of the second electrode strip, the thickness information of the first separator, and the thickness information of the second separator, the adjustment accuracy of the tab position between the formed electrode assemblies can be further improved, and further, the product yield of the electrode assemblies can be improved.

[0151] Figure 4 It is a schematic structural diagram of another winding device provided by some embodiments of the present application.

[0152] Continue to refer to Figure 4 , in some embodiments, two strip detection devices 400 are provided, two electrode strip unwinding devices 100 are provided, and two separator strip unwinding devices 200 are provided. The electrode strip provided by one electrode strip unwinding device 100 and the separator provided by one separator strip unwinding device 200 are configured to jointly pass between the first roller 20 and the second roller 30 of one strip detection device 400. The electrode strip provided by the other electrode strip unwinding device 100 and the separator provided by the other separator strip unwinding device 200 are configured to jointly pass between the first roller 20 and the second roller 30 of the other strip detection device 400.

[0153] Exemplarily, two pole piece unwinding devices 100 respectively provide a first pole piece and a second pole piece, the polarities of the first pole piece and the second pole piece are opposite, the number of separator unwinding devices 200 can be set to two, and the two separator unwinding devices 200 respectively provide a first separator and a second separator. The first pole piece and the first separator form a first composite strip after lamination, and the first composite strip passes between the first roller 20 and the second roller 30 of a strip detecting device 400. The strip detecting device 400 measures the thickness of the first composite strip to obtain the thickness information of the first composite strip; the second pole piece and the second separator form a second composite strip after lamination, and the second composite strip passes between the first roller 20 and the second roller 30 of another strip detecting device 400. The strip detecting device 400 measures the thickness of the second composite strip to obtain the thickness information of the second composite strip.

[0154] In this way, the above technical solution correspondingly adjusts the winding device 300 according to the thickness information of the first composite strip and the thickness information of the second composite strip. Compared with single-strip materials such as pole pieces or separators, the first composite strip and the second composite strip have relatively greater rigidity. Therefore, the deformation amount generated when the first composite strip and the second composite strip pass between the first roller 20 and the second roller 30 of the strip detecting device 400 will be relatively small, which can reduce the data fluctuation during the measurement of the strip detecting device 400, thereby further improving the adjustment accuracy of the tab position between the formed electrode assemblies, and further improving the product yield of the electrode assemblies.

[0155] In some optional embodiments, the pole piece unwinding device 100 includes a first connecting component 500, and the first connecting component 500 can connect the laminated first pole piece and the first separator, so that the first pole piece and the first separator are laminated and connected to form a first composite strip. Thereby, the reliability of the first composite strip can be improved, and the risk of misalignment between the first pole piece and the first separator when the first composite strip passes between the first roller 20 and the second roller 30 of the strip detecting device 400 can be reduced.

[0156] Exemplarily, the first connecting component 500 can be, but is not limited to, a pressure roller or a glue spraying machine, etc. As an example, when the first connecting component 500 is a pressure roller, the pressure roller can press and connect the first pole piece and the first separator; as another example, when the first connecting component 500 is a glue spraying machine, the glue spraying machine can bond the first pole piece and the first separator by spraying glue.

[0157] In some alternative embodiments, the pole piece unwinding device 100 includes a second connecting member 600. The second connecting member 600 can connect the stacked second pole piece and the second separator, so that the second pole piece and the second separator are stacked and connected to form a second composite strip. Thereby, the reliability of the second composite strip can be improved, and the risk of misalignment between the second pole piece and the second separator when the second composite strip passes between the first roller 20 and the second roller 30 of the strip detection device 400 can be reduced.

[0158] Exemplarily, the second connecting member 600 can be, but is not limited to, a pressure roller or a glue spraying machine, etc. As an example, when the second connecting member 600 is a pressure roller, the pressure roller can press and connect the second pole piece and the second separator; as another example, when the second connecting member 600 is a glue spraying machine, the glue spraying machine can bond the second pole piece and the second separator by spraying glue.

[0159] Figure 5 FIG. is a schematic structural diagram of another winding device provided by some embodiments of the present application.

[0160] Continue to refer to Figure 5 , in some embodiments, two strip detection devices 400 are provided, two pole piece unwinding devices 100 are provided, and two separator unwinding devices 200 are provided. The pole piece provided by one pole piece unwinding device 100 and the separators provided by two separator unwinding devices 200 are configured to commonly pass between the first roller 20 and the second roller 30 of one strip detection device 400. The pole piece provided by the other pole piece unwinding device 100 is configured to pass between the first roller 20 and the second roller 30 of the other strip detection device 400.

[0161] Exemplarily, the two pole piece unwinding devices 100 respectively provide a first pole piece and a second pole piece, the polarities of the first pole piece and the second pole piece are opposite, the number of separator unwinding devices 200 can be set to two, and the two separator unwinding devices 200 respectively provide a first separator and a second separator. The first pole piece, the first separator and the second separator are stacked to form a third composite strip, and the third 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 third composite strip to obtain the thickness information of the third composite strip; the second pole piece passes between the first roller 20 and the second roller 30 of the other strip detection device 400, and the strip detection device 400 measures the thickness of the second pole piece to obtain the thickness information of the second pole piece.

[0162] Thus, 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 pole piece. Since the third composite strip has greater rigidity, the deformation amount generated when the third composite strip passes between the first roller 20 and the second roller 30 of the strip detection device 400 is smaller, which can reduce the data fluctuation during the measurement of the strip detection device 400. At the same time, the thickness information of the second pole piece is closer to the true thickness change of the pole piece strip. Therefore, the combination of the thickness information of the third composite strip and the thickness information of the second pole piece can make the thickness data have the advantages of small fluctuation and high reducibility.

[0163] In some alternative embodiments, the pole piece unwinding device 100 includes a third connecting member 700. The third connecting member 700 can connect the stacked first pole piece, the first separator, and the second separator, so that the first pole piece, the first separator, and the second separator are stacked and connected to form a second composite strip. Thereby, the reliability of the third composite strip can be improved, and the risk of misalignment of the first pole piece, the first separator, and the second separator when the third composite strip passes between the first roller 20 and the second roller 30 of the strip detection device 400 can be reduced.

[0164] Exemplarily, the third connecting member 700 can be, but is not limited to, a pressure roller or a glue spraying machine, etc. As an example, when the third connecting member 700 is a pressure roller, the pressure roller can press and connect the first pole piece, the first separator, and the second separator; as another example, when the third connecting member 700 is a glue spraying machine, the glue spraying machine can bond the first pole piece, the first separator, and the second separator by spraying glue.

[0165] Figure 6 FIG. is a schematic structural diagram of another winding device provided by some embodiments of the present application.

[0166] Continue to refer to Figure 6 , in some embodiments, one strip detection device 400 is provided, and two pole piece unwinding devices 100 and two separator unwinding devices 200 are provided. The pole pieces provided by the two pole piece unwinding devices 100 and the separators provided by the two separator unwinding devices 200 are configured to commonly pass between the first roller 20 and the second roller 30 of one strip detection device 400.

[0167] Exemplarily, two pole piece unwinding devices 100 respectively provide a first pole piece and a second pole piece, the polarities of the first pole piece and the second pole piece are opposite, the number of separator unwinding devices 200 can be set to two, and the two separator unwinding devices 200 respectively provide a first separator and a second separator. The first pole piece, the first separator, the second pole piece, and the second separator are laminated to form a fourth composite strip, and the fourth composite strip passes between a first roller 20 and a second roller 30 of a strip detecting device 400, and the strip detecting device 400 measures the thickness of the fourth composite strip to obtain the thickness information of the fourth composite strip.

[0168] Thus, the above technical solution adjusts the winding device 300 accordingly according to the thickness information of the fourth composite strip. The fourth composite strip has greater rigidity. Therefore, the deformation amount generated when the fourth composite strip passes between the first roller 20 and the second roller 30 of the strip detecting device 400 will be smaller, which can reduce the data fluctuation and error during the measurement of the strip detecting device 400. Thereby, the adjustment accuracy of the tab position between the formed electrode assemblies can be further improved, and further, the product yield of the electrode assemblies can be improved.

[0169] In some alternative embodiments, the pole piece unwinding device 100 includes a fourth connecting component 800, and the fourth connecting component 800 can connect the laminated first pole piece, first separator, second pole piece, and second separator, so that the first pole piece, first separator, second pole piece, and second separator are laminated and connected to form a second composite strip. Thereby, the reliability of the fourth composite strip can be improved, and the risk of misalignment of the first pole piece, first separator, second pole piece, and second separator when the fourth composite strip passes between the first roller 20 and the second roller 30 of the strip detecting device 400 can be reduced.

[0170] Exemplarily, the fourth connecting component 800 can be but is not limited to a pressure roller or a glue spraying machine, etc. As an example, when the fourth connecting component 800 is a pressure roller, the pressure roller can press and connect the first pole piece, first separator, second pole piece, and second separator; as another example, when the fourth connecting component 800 is a glue spraying machine, the glue spraying machine can bond the first pole piece, first separator, second pole piece, and second separator by spraying glue.

[0171] Figure 7 Schematic flow chart of a preparation method of an electrode assembly provided by some embodiments of the present application.

[0172] Continue to refer to Figure 7 , according to some embodiments of the present application, the present application also provides a manufacturing method of an electrode assembly, and the manufacturing method of the electrode assembly includes:

[0173] Step 110, providing a pole piece and a separator;

[0174] Step 120: Wind the pole piece and the separator of a predetermined size, then cut the pole piece and the separator and form an electrode assembly.

[0175] Step 130: Wind again and manufacture a plurality of electrode assemblies.

[0176] During the winding process in Step 120 and Step 130, measure the thickness information of at least one of the pole piece and the separator, and feedback to adjust the winding device 300 for winding the pole piece and the separator; wherein, the thickness information is measured by the strip material detection device 400 of any of the above solutions.

[0177] Exemplarily, 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, 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, continue to wind the pole piece and the separator to manufacture a plurality of electrode assemblies. Among them, during the winding process, the strip material detection device 400 can measure at least one of the pole piece and the separator to obtain the 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 tab of the formed electrode assembly.

[0178] As an example, the pole piece unwinding device 100 and the separator unwinding device 200 respectively provide the first section of the pole piece and the first section of the separator. The strip material detection device 400 measures the thickness of at least one of the first section of the pole piece and the first section of the separator, and obtains the first thickness information A1. The winding device 300 winds the first section of the pole piece and the first section of the separator to form the first electrode assembly. The pole piece unwinding device 100 and the separator unwinding device 200 respectively continue to provide the second section of the pole piece and the second section of the separator. The strip material detection device 400 measures the thickness of at least one of the second section of the pole piece and the second section of the separator, and obtains the second thickness information A2. Adjust the winding device 300 according to the first thickness information A1 and the second thickness information A2. After adjustment, the winding device 300 winds the second section of the pole piece and the second section of the separator to form the 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 adjusted smaller or the pressure of the embossing roller of the winding device 300 can be adjusted smaller, and then wind the second section of the pole piece and the second section of the separator to form the 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 adjusted larger or the pressure of the embossing roller of the winding device 300 can be adjusted larger, and then wind the second section of the pole piece and the second section of the separator to form the second electrode assembly.

[0179] It should be noted that the first thickness information A1 can be the average value of multiple thickness point values obtained by the detection component 40 on at least one of the first-stage pole piece and the first-stage separator, or the median value of multiple thickness point values obtained by the detection component 40 on at least one of the first-stage pole piece and the first-stage separator. As an example, after the detection component 40 obtains multiple thickness point values on at least one of the first-stage pole piece and the first-stage separator, the significantly abnormal point values are first filtered out, and then the average value or the median value of the remaining multiple thickness point values is taken.

[0180] Similarly, the second thickness information A2 can be the average value of multiple thickness point values obtained by the detection component 40 on at least one of the second-stage pole piece and the second-stage separator, or the median value of multiple thickness point values obtained by the detection component 40 on at least one of the second-stage pole piece and the second-stage separator. As an example, after the detection component 40 obtains multiple thickness point values on at least one of the second-stage pole piece and the second-stage separator, the significantly abnormal point values are first filtered out, and then the average value or the median value of the remaining multiple thickness point values is taken.

[0181] In this way, the above technical solution can reduce the tab misalignment deviation 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.

[0182] In some embodiments, the step of feedback-regulating the winding device 300 for the pole piece and the separator includes:

[0183] Adjusting the winding device 300 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.

[0184] In this way, during the manufacturing process of the electrode assembly, after the previous electrode assembly is manufactured, the winding parameters of the subsequent electrode assembly can be adjusted in a timely manner, which is beneficial to improving the product yield of the entire electrode assembly manufacturing production line.

[0185] In some embodiments, adjusting the winding device 300 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:

[0186] Adjusting the circumference L of the winding needle of the winding device 300 according to the first thickness information A1 and the second thickness information A2.

[0187] Exemplarily, 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 adjusted to be smaller; 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 adjusted to be larger.

[0188] By adjusting the circumference L of the winding needle of the winding device 300, the process is simple and the operation is convenient. It can reduce the overall manufacturing difficulty of the electrode assembly and is beneficial to further improve the product yield of the electrode assembly.

[0189] In some embodiments, the relationship between the first thickness information A1, the second thickness information A2, and the circumference L of the winding needle of the winding device 300 is: A2 - A1 = N * L, where N is the number of winding turns.

[0190] Exemplarily, the number of winding turns N is a preset value. Through the difference between the second thickness information A2 and the first thickness information A1 and the number of winding turns N, the circumference L of the winding needle can be determined. 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 the separator are wound to form the next electrode assembly.

[0191] Optionally, the value range of the number of winding turns N can be 10 - 80. Exemplarily, the number of winding turns N can be but is not limited to 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 75, 80, etc., and can be selected according to the actual application environment.

[0192] By adjusting the circumference of the winding needle of the winding device 300 through the above formula, the adjustment accuracy can be improved while reducing the calculation complexity.

[0193] In some embodiments, adjusting the winding device 300 according to the first thickness information A1 of one of the two adjacent electrode assemblies during winding and the second thickness information A2 of the other during winding includes:

[0194] Adjusting the pressure Q of the embossing roller of the winding device 300 according to the first thickness information A1 and the second thickness information A2.

[0195] Exemplarily, 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 adjusted to be smaller; 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 adjusted to be larger.

[0196] By adjusting the pressure Q of the embossing roller of the winding device 300, it is possible to improve the alignment of the tabs between multiple formed electrode assemblies while having a relatively small impact on the dimensions between multiple electrode assemblies, thereby facilitating the improvement of the product consistency of the electrode assemblies.

[0197] In some embodiments, the relationship between the first thickness information A1, the second thickness information A2, and the pressure Q of the embossing roller of the winding device 300 is satisfied: 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.

[0198] Exemplarily, in the above formula, both the number of winding turns N and the circumference L of the winding needle are preset values, and b is a constant coefficient. Through 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, the pressure Q of the embossing roller of the winding device 300 can be determined. Thus, after the manufacture of the previous electrode assembly is completed, the embossing roller of the winding device 300 is adjusted according to the pressure Q of the embossing roller of the winding device 300, and then the electrode sheet and the separator are wound to form the subsequent electrode assembly.

[0199] Optionally, the value range of b can be 1 - 3. Exemplarily, b can be but is not limited to 1, 1.5, 2, 2.5, 3, etc., and can be selected according to the actual application environment.

[0200] Optionally, the value range of the number of winding turns N can be 10 - 80. Exemplarily, the number of winding turns N can be but is not limited to 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 75, 80, etc., and can be selected according to the actual application environment.

[0201] Optionally, the value range of the circumference L of the winding needle can be 100 mm - 700 mm. Exemplarily, the circumference L of the winding needle can 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 can be selected according to the actual application environment.

[0202] By adjusting the embossing roller of the winding device 300 through the above formula, it is possible to improve the adjustment accuracy while reducing the computational complexity.

[0203] To better understand the strip detection device 400 provided in the embodiments of the present application, based on the same inventive concept, embodiments of the above strip detection device 400 in actual applications are provided for description here.

[0204] 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, 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 the first roller 20 can rotate around a first axis 21. The second roller 30 is connected to the mounting frame 10 and can rotate around 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, and the second roller 30 can approach or move away from the first roller 20 along a first direction X.

[0205] The two guide rods 50 are respectively arranged at both ends of the second roller 30 along the direction parallel to the second axis 31. The mounting frame 10 is provided with a guide hole 11. The guide hole 11 penetrates the mounting frame 10 along the first direction X. The guide rod 50 is inserted into the guide hole 11 and is movably connected to the mounting frame 10 along the first direction X. The guide rod 50 is fixed to the second roller 30. One end of the guide rod 50 away from the second roller 30 extends out of the guide hole 11, and a limiting member 60 is arranged at one end of the guide rod 50 away from the second roller 30. The guide rod 50 is configured to be able to move along the first direction X when the external force received reaches a first threshold.

[0206] The detection component 40 is connected to the second roller 30. The detection component 40 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 piece 41 and a second detection piece 42. The first detection piece 41 and the second detection piece 42 are respectively arranged at both ends of the second roller 30 along the direction parallel to the second axis 31. The adjustment component 70 is communicatively connected to the detection component 40. The adjustment component is used to obtain the thickness information of the detection component 40 and adjust the target device for winding the strip material according to the thickness information.

[0207] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A strip material detection device, characterized in that, Comprising: Mounting bracket; A first roller, connected to the mounting bracket, the first roller being capable of rotating about a first axis; A second roller, connected to the mounting bracket and capable of rotating about a second axis, the first axis being parallel to the second axis, a passage for the strip material to pass through being formed between the first roller and the second roller, the second roller being capable of approaching or moving away from the first roller in a first direction; A detection component for detecting the displacement of the second roller in 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, the first detection piece and the second detection piece being respectively arranged at two ends of the second roller in a 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 bracket is provided with a guide hole, the guide rod passes through the guide hole and is movably connected to the mounting bracket 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 capable of moving along the first direction when the external force received reaches a first threshold.

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

6. The strip material detection device according to claim 3, characterized in that, The guide hole penetrates through the mounting bracket along the first direction.

7. The strip material detection device according to claim 6, characterized in that 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 in a direction parallel to the second axis.

9. The strip material detection device according to claim 1, characterized in that, 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 used for obtaining the thickness information of the detection component and adjusting the 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 bracket 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, characterized in that, 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, characterized in that, Comprising: A pole piece unwinding device for providing a pole piece; An insulator unwinding device for providing an insulator; A winding device for winding the pole piece and the insulator; And The strip material detection device according to any one of claims 1-12, arranged upstream of the winding device, at least one of the insulator and the pole piece passing between the first roller and the second roller.

14. The winding device according to claim 13, characterized in that, 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, characterized in that, Four strip material detection devices are provided, two pole piece unwinding devices are provided, and two insulator 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 insulators provided by the two insulator unwinding devices are configured to respectively pass between the first roller and the second roller of the other two strip material detection devices.

16. The winding device according to claim 13, characterized in that, The strip material detection devices are provided in two numbers, the pole piece unwinding devices are provided in two numbers, and the separator unwinding devices are provided in two numbers; The pole piece provided by one of the pole piece unwinding devices and the separator provided by one of the separator unwinding devices are configured to jointly pass between the first roller and the second roller of one of the strip material detection devices; The pole piece provided by the other pole piece unwinding device and the separator provided by the other separator unwinding device are configured to jointly pass between the first roller and the second roller of the other strip material detection device.

17. The winding device according to claim 13, characterized in that, The strip material detection devices are provided in two numbers, the pole piece unwinding devices are provided in two numbers, and the separator unwinding devices are provided in two numbers; The pole piece provided by one of the pole piece unwinding devices and the separators provided by the two separator unwinding devices are configured to jointly pass between the first roller and the second roller of one of the strip material detection devices; The pole piece provided by the other pole piece unwinding device is configured to pass between the first roller and the second roller of the other strip material detection device.

18. The winding device according to claim 13, characterized in that, One strip material detection device is provided, two pole piece unwinding devices are provided, and two separator unwinding devices are provided; The pole pieces provided by the two pole piece unwinding devices and the separators provided by the two separator unwinding devices are configured to jointly pass between the first roller and the second roller of one strip material detection device.

19. A manufacturing method of an electrode assembly, characterized in that, Comprising: Providing a pole piece and a separator; Winding the pole piece and the separator of a predetermined size, and then cutting the pole piece 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 pole piece and the separator, and feeding back to adjust the winding device for winding the pole piece and the separator; Wherein, the thickness information is measured by using the strip material detection device according to any one of claims 1-12.

20. The manufacturing method of the electrode assembly according to claim 19, characterized in that, The step of feeding back to adjust the winding device for winding the pole piece and the separator includes: Adjusting the winding device according to the first thickness information A1 of one of 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, characterized in that, The adjusting the winding device according to the first thickness information A1 of one of 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, characterized in that, 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, characterized in that, The adjusting the winding device according to the first thickness information A1 of one of two adjacent electrode assemblies during the winding process and the second thickness information A2 of the other during the winding process 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, The following 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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