Bump preparation device, battery production system and winding method

Abstract

A bump preparation device, comprising a bump preparation mechanism (100) and a compacting mechanism (200) which are sequentially arranged in a conveying direction (X) of a first material (300), wherein the bump preparation mechanism (100) is used for preparing overvoltage bumps (310) on the first material (300); the height (h) of each overvoltage bump is greater than the height of a preset bump, and the preset bump is a bump required by the first material (300); and the compacting mechanism (200) is used for applying a pressure to the overvoltage bumps (310) towards a main body of the first material (300), so that the thickness (a) of the first material reaches a preset value. The device can improve the thickness consistency of electrode sheets and reduce the risk of tab dislocation. Also provided are a battery production system and a winding method.

Description

Bumping device, battery production system and winding method

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 18, 2023, with application number 202311349041.7 and invention name “Bumping device, battery production system and winding method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of battery production equipment, and in particular relates to a convexity-making device, a battery production system, and a winding method. Background Art

[0003] A wound electrode assembly typically consists of a negative electrode sheet, a positive electrode sheet, and a separator arranged in a predetermined sequence. The electrode sheet is typically thicker than the separator and is typically provided with tabs, often with multiple tabs on the same electrode sheet. However, in current wound electrode assembly production, tab misalignment is a common problem.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a convex forming device, a battery production system and a winding method, aiming to improve the technical problem that the position of the tabs in the wound electrode assembly is easily misaligned. Technical Solutions

[0006] The technical solution adopted in the embodiment of this application is:

[0007] In the first aspect, an embodiment of the present application provides a embossing device, comprising a embossing mechanism and a compacting mechanism arranged in sequence along the conveying direction of a first material, the embossing mechanism being used to prepare overpressure bumps on the first material, the height of the overpressure bumps being greater than the height of preset bumps, the preset bumps being the bumps required for the first material, the compacting mechanism being used to apply pressure to the overpressure bumps toward the main body of the first material so that the thickness of the first material reaches a preset value.

[0008] The embodiment of the present application provides a convex device, which is provided with a convex mechanism and a compacting mechanism arranged in sequence along the conveying direction of the first material, changing the convex process of the related art in which the preset convex points are directly obtained by the convex mechanism. Instead, an overpressure convex point with a height greater than the height of the preset convex point is first obtained on the first material in two steps, and then pressure is applied to the overpressure convex point by the compacting mechanism, so that the height of the convex point on the first material is reduced, thereby making the thickness of the first material reach the preset value. In this way, even if the thickness of the first material before passing through the convex device is uneven, the thickness of different areas of the first material after passing through the convex device can be made equal, which can reduce the risk of defective products such as tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding quality rate of the electrode assemblies to a certain extent. At the same time, the convex device provided in the embodiment of the present application is highly compatible with the thickness of the incoming electrode material, so that electrodes of different thicknesses can be mixed and matched, and the manpower and factory area required for the grading and matching of the electrode pieces can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0009] In some embodiments, the embossing mechanism includes a first roller and a second roller spaced apart from each other, with a first gap defined between the first roller and the second roller for passage of the first material, and at least one of the first roller and the second roller having a raised portion. The embossing mechanism employs the structure provided in this embodiment, which is simple and facilitates assembly and processing of the first material.

[0010] In some embodiments, one of the first and second rollers is provided with a raised portion, and the other roller is provided with an elastic layer for contacting the first material. The convex forming mechanism adopts the structure provided in this embodiment, which is simple and easy to assemble and process the first material.

[0011] In some embodiments, the first roller and the second roller are both provided with raised portions, and the raised portions on the first roller and the raised portions on the second roller are staggered, so as to facilitate the passage of the first material through the first gap and the preparation of the overpressure convex points.

[0012] In some embodiments, the embossing mechanism further includes a first bracket, wherein one of the first roller and the second roller is fixedly mounted on the first bracket, and the other roller is movably mounted on the first bracket along a first direction; wherein the first direction is perpendicular to the axis of the fixed roller. The solution provided in this embodiment allows the width of the first gap to be adjustable. The width of the first gap refers to the distance between the roller surface of the first roller and the roller surface of the second roller. This allows the embossing mechanism to be applied to embossing first materials of varying thicknesses, thereby broadening its scope of application.

[0013] In some embodiments, the convexification mechanism further includes a first movable bracket, the first movable bracket being movably mounted on the first bracket along the first direction, and the movable roller being fixedly mounted on the first movable bracket. This embodiment facilitates position adjustment of the movable roller compared to mounting the movable roller directly on the first bracket.

[0014] In some embodiments, the convexification mechanism further includes a first linear drive mechanism mounted on the first bracket, with a driving end of the first linear drive mechanism connected to the first movable bracket for driving the first movable bracket to move. This embodiment further improves the automation level of the convexification mechanism, making adjustment of the width of the first gap more convenient and accurate.

[0015] In some embodiments, the compacting mechanism includes a third roller and a fourth roller spaced apart from each other, with a second gap defined between the third roller and the fourth roller for passage of the first material. The width of the second gap is less than the thickness of the first material output by the convexification mechanism. The compacting mechanism employing the structure provided in this embodiment is simple and facilitates assembly and processing of the first material.

[0016] In some embodiments, the compacting mechanism further includes a second bracket, one of the third and fourth rollers being fixedly mounted on the second bracket, and the other roller being movably mounted on the second bracket along a second direction; the second direction being perpendicular to the axis of the fixed roller. This embodiment provides an adjustable width b of the second gap. This allows the compacting mechanism to be adapted to the processing needs of first materials of varying thicknesses, broadening its applicability to a certain extent.

[0017] In some embodiments, the compacting mechanism further includes a second movable bracket, the second movable bracket being movably mounted on the second bracket in the second direction, and the movable roller being fixedly mounted on the second movable bracket. This embodiment makes it easier to adjust the position of the movable roller compared to directly mounting the movable roller on the second bracket.

[0018] In some embodiments, the compaction mechanism further includes a second linear drive mechanism mounted on the second bracket, with a driving end of the second linear drive mechanism connected to the second movable bracket for driving the second movable bracket to move. This embodiment further enhances the automation level of the compaction mechanism, making adjustment of the width of the first gap more convenient and accurate.

[0019] In some embodiments, the compacting mechanism further includes a fixing structure for securing the movable roller in position after it is moved into position. This embodiment allows the movable roller to be fixed relative to the second bracket and the fixed roller after it is moved into position, thereby ensuring stable compacting mechanism processing operations.

[0020] In some embodiments, the fixed structure includes a first support portion and a second support portion. The first support portion is fixedly mounted on the second bracket and is located on a side of the second movable bracket away from the second linear drive mechanism. The first support portion and the second movable bracket are spaced apart, with a third gap therebetween. The second support portion is configured to be installed within the third gap after the movable roller is moved into position, and to abut against the second movable bracket and the first support portion, respectively. The fixed structure adopts the structure provided in this embodiment, which is simple in structure and easy to prepare and install.

[0021] In some embodiments, along the third direction, the third gap has a first end and a second end that are oppositely disposed, and the width of the third gap gradually decreases from the first end toward the second end. The second support portion is configured to be inserted into the third gap from the first end. Furthermore, along the third direction, the cross-sectional area of ​​the second support portion gradually increases from the insertion end toward the other end. This embodiment facilitates installation of the second support portion and can improve production efficiency to a certain extent.

[0022] In some embodiments, the surface of the second movable bracket facing the first support portion is a horizontal plane, while the surface of the first support portion facing the second movable bracket is an inclined surface. The surface of the second support portion that contacts the second movable bracket is a horizontal plane, while the surface that contacts the first support portion is an inclined surface. This embodiment allows the second support portion to achieve surface contact with the first support portion and the second movable bracket, respectively. This increases the friction between the second support portion, the second movable bracket, and the first support portion after installation, thereby providing stable support for the second movable bracket.

[0023] In some embodiments, the second support portion is a wedge-shaped block. The solution provided by this embodiment makes the second support portion simple and stable in structure, and is easy to prepare and operate.

[0024] In some embodiments, the compacting mechanism further includes an adjustment assembly mounted on the second bracket, a driving end of the adjustment assembly connected to the second support portion for driving the second support portion to be inserted into the third gap. The provision of the adjustment assembly facilitates insertion of the second support portion into the third gap, thereby improving the processing efficiency of the first material to a certain extent.

[0025] In some embodiments, the adjustment assembly includes a first adjustment portion and a second adjustment portion. The first adjustment portion is fixedly mounted on the second bracket, the second adjustment portion is threadedly connected to the first adjustment portion, and the second adjustment portion abuts the second support portion. The adjustment assembly adopts the structure provided by this embodiment, which is simple in structure and easy to operate.

[0026] In some embodiments, the first adjustment portion includes a protrusion that protrudes from the second bracket, the protrusion having a threaded hole, and the second adjustment portion includes a bolt threadedly connected to the threaded hole. Using the solution provided by this embodiment, the structures of the first and second adjustment portions are relatively simple, making them easy to install and operate.

[0027] On the second aspect, an embodiment of the present application provides a battery production system, including the convex forming device provided by any of the above embodiments. The battery production system provided by the embodiment of the present application adds a set of convex forming mechanisms and compacting mechanisms in front of the winding equipment, so that the thickness of different areas of the first material after passing through the convex forming device is comparable, which can reduce the risk of defective products such as tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies produced and the winding quality rate of the electrode assemblies to a certain extent. At the same time, the battery production system provided by the embodiment of the present application has strong compatibility with the thickness of the incoming electrode materials, so that electrodes of different thicknesses can be mixed and matched, and the manpower and factory area required for the grading and matching of the electrode sheets can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0028] Thirdly, embodiments of the present application provide a winding method, comprising: providing a pole piece and a separator; processing them using the convex forming device provided in any of the above embodiments; and winding and forming. The winding method provided in embodiments of the present application can produce a first material with comparable thicknesses in different regions, which can reduce the risk of defective products such as tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies produced and the winding efficiency of the electrode assemblies to a certain extent. Furthermore, the method has strong compatibility with the thickness of incoming pole piece materials, allowing pole pieces of different thicknesses to be mixed and matched, eliminating or reducing to a certain extent the manpower and plant area required for the grading and matching of pole pieces, thereby improving winding efficiency to a certain extent.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is a schematic diagram of a convexification device in use according to some embodiments of the present application;

[0032] FIG2 is a schematic diagram of a convexification device in use according to another embodiment of the present application;

[0033] FIG3 is a schematic structural diagram of the first material in FIG2 ;

[0034] FIG4 is a schematic diagram of the front view of the convexification mechanism in some embodiments of the present application;

[0035] FIG5 is a schematic diagram of the three-dimensional structure of a convexification mechanism according to some embodiments of the present application;

[0036] FIG6 is a schematic diagram of the front view of the compacting mechanism in some embodiments of the present application;

[0037] FIG7 is a schematic diagram of the three-dimensional structure of a compacting mechanism according to some embodiments of the present application;

[0038] FIG8 is a side view schematic diagram of the compacting mechanism according to some embodiments of the present application, wherein the second supporting portion is not shown;

[0039] FIG9 is a schematic flow chart of a winding method according to some embodiments of the present application.

[0040] The accompanying drawings in the specific implementation manner are as follows:

[0041] 100, convex forming mechanism; 110, first roller; 120, second roller; 130, first gap; 140, convex portion; 150, elastic layer; 160, first bracket; 170, first movable bracket; 180, first linear drive mechanism;

[0042] 200, compacting mechanism; 210, third roller; 220, fourth roller; 230, second gap; 240, second bracket; 250, second movable bracket; 260, second linear drive mechanism; 270, fixed structure; 271, first support portion; 272, second support portion; 273, third gap; 274, first end; 275, second end; 280, adjustment assembly; 281, first adjustment portion; 282, second adjustment portion;

[0043] 300, first material; 310, overvoltage bump; 320, first surface;

[0044] X, conveying direction of the first material; h, height of the overpressure bump; a, thickness of the first material; b, width of the second gap; Y1, first direction; Y2, second direction; Z, third direction; N, normal direction. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0048] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, "and / or B" can represent three situations: the existence of "A" alone, the existence of "B" and "B" at the same time, and the existence of "B" alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0050] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0053] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0054] The electrode assembly is an important component of the battery. Based on the method of manufacturing, it can be divided into wound electrode assemblies and laminated electrode assemblies. Of these, wound electrode assemblies are widely used due to their ease of operation and ease of quality control.

[0055] A wound electrode assembly generally includes a negative electrode sheet, a positive electrode sheet, and a separator arranged in a preset order. Among them, the thickness of the electrode sheet is generally greater than the thickness of the separator, and the electrode sheet is generally provided with a pole ear, and multiple pole ears are often provided on the same electrode sheet. That is, multiple positive pole ears are generally provided on the positive electrode sheet, and multiple negative pole ears are generally provided on the negative electrode sheet. Ideally, after the electrode sheet and the separator are wound and formed, all the positive pole ears should be aligned, and all the negative pole ears should be aligned, but in actual production, especially in batch production, the thickness of each electrode sheet is often not completely consistent, and the thickness of the same electrode sheet is sometimes uneven. This will cause the position of the pole ears to be misaligned after the electrode sheet and the separator are wound and formed, resulting in defective products.

[0056] In order to improve the above problems, the embodiment of the present application provides a convex device, which is provided with a convex mechanism and a compacting mechanism arranged in sequence along the conveying direction of the first material, changing the convex process of directly making a preset convex point by the convex mechanism in the related art. Instead, an overpressure convex point with a height greater than the height of the preset convex point is first made on the first material in two steps, and then a pressure is applied to the overpressure convex point by the compacting mechanism, so that the height of the convex point on the first material is reduced, thereby making the thickness of the first material reach the preset value. In this way, even if the thickness of the first material before passing through the convex device is uneven, the thickness of different areas of the first material after passing through the convex device can be made to be equal, which can reduce the risk of defective products such as tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding quality rate of the electrode assemblies to a certain extent. At the same time, the convex device provided in the embodiment of the present application is highly compatible with the thickness of the incoming electrode material, so that electrodes of different thicknesses can be mixed and matched, and the manpower and factory area required for the grading of the electrode pieces can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0057] The convexity forming device disclosed in the embodiments of the present application can be used in a winding apparatus, a winding production line, or a winding method. Winding apparatus generally includes a convexity forming device. In addition, the winding apparatus may also include a winding needle located downstream of the convexity forming device, or other equipment. The convexity forming device is used to create convex points on a positive electrode sheet, a negative electrode sheet, or a combination of an electrode sheet and a separator to achieve uniform thickness, while the winding needle is used to wind the electrode sheet and separator into shape.

[0058] A winding production line generally includes the aforementioned winding equipment. Furthermore, the winding production line may also include a feeding mechanism or other equipment located upstream of the convexification device. The feeding mechanism may include a first diaphragm feeding mechanism, a first electrode piece feeding mechanism, and a second diaphragm feeding mechanism. "Being located upstream of the convexification device" means that during the production process, the relevant materials (such as the first diaphragm, the first electrode piece, and the second diaphragm) will first pass through the feeding mechanism and then through the convexification device.

[0059] Referring to Figures 1 to 3, embodiments of the present application provide a convex-forming device. The convex-forming device includes a convex-forming mechanism 100 and a compacting mechanism 200, arranged sequentially along a conveying direction X of a first material 300. The convex-forming mechanism 100 is configured to form overpressure bumps 310 on the first material 300. The height h of the overpressure bumps 310 is greater than the height of a predetermined bump, which is the desired bump for the first material 300. The compacting mechanism 200 is configured to apply pressure to the overpressure bumps 310 toward the first surface 320 of the first material 300, thereby increasing the thickness a of the first material 300 to a predetermined value.

[0060] The convex forming device provided in the embodiment of the present application can be used for the preparation of electrode assemblies, and can also be used for the preparation of other materials. For ease of understanding, the following uses the convex forming device for the preparation of electrode assemblies as an example to illustrate its use principle.

[0061] The first material 300 can be a single electrode sheet, such as a positive electrode sheet or a negative electrode sheet; it can also be a combination of either electrode sheet and a separator, such as a stacked positive electrode sheet and separator, or a stacked negative electrode sheet and separator; it can also be a stacked positive electrode sheet, separator, and negative electrode sheet; or it can be a stacked negative electrode sheet, separator, or a stacked positive electrode sheet and separator. The specific configuration can be determined based on usage needs. Both the positive and negative electrode sheets have tabs, as shown in Figure 3. It should be understood that the first material 300 shown in Figure 3 is in an unprocessed state; after processing, the entire first surface 320 of the first material 300 will have bumps.

[0062] The convex forming mechanism 100 and the compacting mechanism 200 are sequentially arranged along the conveying direction X of the first material 300 , which means that when processing the first material 300 , the first material 300 first passes through the convex forming mechanism 100 and then passes through the compacting mechanism 200 .

[0063] The embossing mechanism 100 can be composed of a single component or a combination of multiple components, such as a pressure plate or a pressure block with a raised portion, or it can include two rollers, at least one of which is provided with a raised portion. Other forms can also be used as long as the overpressure convex point 310 can be prepared on the first material 300.

[0064] It is understandable that the overvoltage bumps 310 are generally hemispherical bump structures, but may also be block-shaped bump structures, or bump structures of other shapes, which may be determined according to the manufacturing process.

[0065] The height h of the overpressure bump 310 refers to the dimension by which the overpressure bump 310 protrudes from the first surface 320 of the first material 300 in the normal direction N of the first surface 320 of the first material 300. The height of the predetermined bump refers to the dimension by which the predetermined bump protrudes from the first surface 320 of the first material 300 in the normal direction N of the first surface 320 of the first material 300. The first surface refers to the surface of the first material 300 on which the overpressure bump 310 is provided. The predetermined bump refers to the bump that should be produced on the first material 300 after passing through the entire bump-forming device according to processing requirements. It is understood that the height h of the overpressure bump 310 and the height of the predetermined bump can each be a fixed value or a range of values, depending on the application. When either the height h of the overpressure bump 310 or the height of the predetermined bump is within a range, the height h of the overpressure bump 310 is greater than the predetermined height of the bump required for the first material 300, meaning that the minimum value of the height h of the overpressure bump 310 is greater than the maximum value of the height h of the predetermined bump.

[0066] The compaction mechanism 200 can be composed of a single component or a combination of multiple components, such as a pressure plate, a pressure block, or two rollers. Other forms are also possible, as long as it can apply pressure to the overpressure bump 310 toward the first surface 320 of the first material 300 so that the thickness a of the first material 300 reaches a preset value. The thickness a of the first material 300 refers to the vertical distance between the highest point of the bump and the side of the first surface of the first material 300 facing away from the highest point of the bump, along the normal direction N of the first surface 320 of the first material 300. The bump referred to here refers to the bump formed after the overpressure bump passes through the compaction mechanism. The preset value refers to the thickness value that the first material 300 should have after passing through the entire convexification device according to processing requirements. It is understood that the preset value can be a fixed value or a range of values, and the specific thickness can be determined according to the specific needs of use.

[0067] It is understandable that the pressure toward the first surface 320 of the first material 300 may be a force along the normal direction N of the first surface 320 of the first material 300 , or may be a force forming an angle with the normal direction N of the first surface 320 of the first material 300 .

[0068] The process of using the convexity-forming device provided in the embodiment of the present application is as follows:

[0069] The first material 300, in a flat state, first passes through the workstation where the embossing mechanism 100 is located. This mechanism 100 embosses the first material 300, producing overpressure bumps 310. At this point, the thickness a of the first material 300 is greater than a preset value. The first material 300, with the overpressure bumps 310, is then conveyed to the workstation where the compacting mechanism 200 is located. The compacting mechanism 200 applies pressure to the overpressure bumps 310 toward the first surface 320 of the first material 300, reducing the height of the bumps on the first material 300 until the thickness a of the first material 300 is consistent with or within a preset range.

[0070] The convex forming device provided in the embodiment of the present application is provided with a convex forming mechanism 100 and a compacting mechanism 200 arranged in sequence along the conveying direction X of the first material 300, which changes the convex forming process of directly forming a preset convex point by the convex forming mechanism 100 in the related art. Instead, an overpressure convex point 310 with a height greater than the height of the preset convex point is first formed on the first material 300 in two steps, and then pressure is applied to the overpressure convex point 310 by the compacting mechanism 200, so that the height of the convex point on the first material 300 is reduced, thereby making the thickness a of the first material 300 reach a preset value. In this way, even if the thickness of the first material 300 before passing through the convex forming device is uneven, the thickness of different areas of the first material after passing through the convex forming device can be made to be equivalent, which can reduce the risk of defective products such as tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding quality rate of the electrode assemblies to a certain extent. At the same time, the convexing device provided in the embodiment of the present application is highly compatible with the thickness of the incoming electrode material, so that electrodes of different thicknesses can be mixed and matched, and the manpower and factory area required for the grading and matching of the electrode can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0071] As shown in Figures 4 and 5, in some embodiments, the convex forming mechanism 100 includes a first roller 110 and a second roller 120 spaced apart from each other. A first gap 130 is defined between the first roller 110 and the second roller 120 for allowing the first material 300 to pass through. At least one of the first roller 110 and the second roller 120 is provided with a protrusion 140.

[0072] One or more first rollers 110 can be provided as needed, and one or more second rollers 120 can also be provided as needed.

[0073] The first gap 130 is the gap between the roller surface of the first roller body 110 and the roller surface of the second roller body 120. The width of the first gap 130 can be equal to the thickness a of the first material 300, or slightly smaller than the thickness a of the first material 300.

[0074] The fact that at least one of the first roller body 110 and the second roller body 120 is provided with the protrusion 140 means that the protrusion 140 can be provided on the first roller body 110 and the protrusion 140 can be not provided on the second roller body 120; or the protrusion 140 can be not provided on the first roller body 110 and the protrusion 140 can be provided on the second roller body 120; or the protrusion 140 can be provided on both the first roller body 110 and the second roller body 120.

[0075] The convex forming mechanism 100 adopts the structure provided in this embodiment, which has a simple structure and is easy to assemble and process the first material 300.

[0076] As shown in FIG. 4 and FIG. 5 , in some embodiments, one of the first roller 110 and the second roller 120 is provided with a protrusion 140 , and the surface of the other roller is provided with an elastic layer 150 for contacting the first material 300 .

[0077] The solution provided in this embodiment includes two situations: the first situation is that a protrusion 140 is provided on the first roller body 110, and the surface of the second roller body 120 is provided with an elastic layer 150 for contacting the first material 300; the second situation is that a protrusion 140 is provided on the second roller body 120, and the surface of the first roller body 110 is provided with an elastic layer 150 for contacting the first material 300.

[0078] The elastic layer 150 can be made of different materials and set in different ways according to the needs of use. For example, it can be an elastic sleeve mounted on the corresponding roller body, such as a rubber sleeve, a composite material sleeve, etc., or it can be an elastic coating coated on the surface of the corresponding roller body. It can also be in other forms, which can be determined according to the specific needs of use.

[0079] The convex forming mechanism 100 adopts the structure provided in this embodiment, which has a simple structure and is easy to assemble and process the first material 300.

[0080] In some embodiments, the first roller body 110 and the second roller body 120 are both provided with a protrusion 140 , and the protrusion 140 on the first roller body 110 and the protrusion 140 on the second roller body 120 are staggered.

[0081] In this embodiment, the first roller body 110 and the second roller body 120 can be made of hard materials, such as metal, non-metal, etc., or can be made of materials with a certain degree of elasticity, such as rubber, nylon, etc.

[0082] The staggered setting refers to the staggered setting of the protrusions 140 on the first roller body 110 and the protrusions 140 on the second roller body 120, so that during processing, any area of ​​the first material 300 can only contact the protrusions 140 on one of the roller bodies, and will not contact the protrusions 140 on both roller bodies at the same time, thereby facilitating the first material 300 to pass through the first gap 130 and the preparation of the overpressure bump 310.

[0083] As shown in Figures 4 and 5, in some embodiments, the convexification mechanism 100 further includes a first bracket 160. One of the first roller 110 and the second roller 120 is fixedly mounted on the first bracket 160, and the other roller is movably mounted on the first bracket 160 along a first direction Y1. The first direction Y1 is perpendicular to the axis of the fixed roller.

[0084] The first bracket 160 can be made of one component or a combination of multiple components according to the needs of use. The specific structure can be determined according to the needs of use.

[0085] One of the first roller body 110 and the second roller body 120 is fixedly mounted on the first bracket 160, and the other roller body is movably mounted on the first bracket 160 along the first direction Y1. There are two situations: first, the first roller body 110 is fixedly mounted on the first bracket 160, and the second roller body 120 is movably mounted on the first bracket 160 along the first direction Y1 (i.e., a direction perpendicular to the axial direction of the first roller body 110); second, the second roller body 120 is fixedly mounted on the first bracket 160, and the first roller body 110 is movably mounted on the first bracket 160 along the first direction Y1 (i.e., a direction perpendicular to the axial direction of the second roller body 120).

[0086] The above-mentioned fixed installation on the first bracket 160 means that after the corresponding roller is installed on the first bracket 160, it only has the freedom to rotate around its own axis, and does not have the freedom to move relative to the first bracket 160 in a direction perpendicular to its own axis.

[0087] The solution provided in this embodiment allows for adjustable width of the first gap 130. The width of the first gap 130 refers to the distance between the roller surface of the first roller 110 and the roller surface of the second roller 120. This allows the embossing mechanism 100 to be applied to embossing first materials 300 of varying thicknesses, broadening its scope of application to a certain extent.

[0088] In some embodiments, the convexification mechanism 100 further includes a first movable bracket 170. The first movable bracket 170 is movably mounted on the first bracket 160 along the first direction Y1. The movable roller is fixedly mounted on the first movable bracket 170.

[0089] The first movable bracket 170 can be made of one component or a combination of multiple components according to usage requirements. The specific configuration can be determined based on usage requirements.

[0090] The movable roller is fixedly installed on the first movable bracket 170, which means that the above-mentioned roller capable of moving along the first direction Y1 relative to the first bracket 160 is fixedly installed on the first movable bracket 170, and the roller only has the freedom to rotate around its own axis relative to the first movable bracket 170, and does not have the freedom to move relative to the first movable bracket 170 along the direction perpendicular to its own axis.

[0091] Compared with the case where the movable roller is directly mounted on the first bracket 160 , the solution provided in this embodiment can make the position adjustment of the movable roller easier to operate.

[0092] In some embodiments, the convexification mechanism 100 further includes a first linear drive mechanism 180. The first linear drive mechanism 180 is mounted on the first bracket 160, and a driving end of the first linear drive mechanism 180 is connected to the first movable bracket 170 for driving the first movable bracket 170 to move.

[0093] The first linear drive mechanism 180 in this embodiment can be a pneumatic cylinder, a hydraulic cylinder, or other linear drive mechanisms, and can be composed of one component or multiple components, depending on the specific usage requirements.

[0094] During use, the first linear drive mechanism 180 can be controlled to operate so as to control the first movable bracket 170 to move relative to the first bracket 160 , thereby adjusting the width of the first gap 130 between the first roller 110 and the second roller 120 .

[0095] The solution provided in this embodiment further improves the degree of automation of the convexification mechanism 100, making the width adjustment of the first gap 130 more convenient and accurate.

[0096] In some embodiments, the first linear drive mechanism 180 includes a pneumatic cylinder, a hydraulic cylinder, and / or a servo motor linear drive.

[0097] The solutions provided in this embodiment include but are not limited to the following situations: First, the first linear drive mechanism 180 includes only a pneumatic cylinder, wherein the number of the cylinders may be one or more; second, the first linear drive mechanism 180 includes only a hydraulic cylinder, wherein the number of the hydraulic cylinders may be one or more; third, the first linear drive mechanism 180 includes both a pneumatic cylinder and a hydraulic cylinder, wherein the number of the cylinders and the number of the hydraulic cylinders may be one or more respectively; fourth, the first linear drive mechanism 180 includes only a servo motor linear drive, wherein the number of the servo motor linear drive may be one or more; fifth, the first linear drive mechanism 180 includes both a pneumatic cylinder and a servo motor linear drive, wherein the number of the cylinders and the number of the servo motor linear drive may be one or more respectively; sixth, the first linear drive mechanism 180 includes both a hydraulic cylinder and a servo motor linear drive, wherein the number of the hydraulic cylinders and the number of the servo motor linear drive may be one or more respectively; seventh, the first linear drive mechanism 180 includes a pneumatic cylinder, a hydraulic cylinder and a servo motor linear drive, wherein the number of the cylinder, the hydraulic cylinder and the servo motor linear drive may be one or more respectively.

[0098] The first linear drive mechanism 180 adopts the solution provided in this embodiment, which has a simple structure and is easy to install.

[0099] As shown in Figures 6 and 7, in some embodiments, the compacting mechanism 200 includes a third roller 210 and a fourth roller 220 spaced apart from each other. A second gap 230 is defined between the third roller 210 and the fourth roller 220 for allowing the first material 300 to pass through. The width b of the second gap 230 is less than the thickness a of the first material 300 output by the compacting mechanism 200.

[0100] One or more third roller bodies 210 can be provided as needed, and one or more fourth roller bodies 220 can also be provided as needed.

[0101] The second gap 230 is the gap between the roller surface of the third roller body 210 and the roller surface of the fourth roller body 220. The width b of the second gap 230 is the distance between the roller surface of the third roller body 210 and the roller surface of the fourth roller body 220.

[0102] The compacting mechanism 200 adopts the structure provided in this embodiment, which has a simple structure and is convenient for assembly and processing of the first material 300 .

[0103] In some embodiments, the compacting mechanism 200 further includes a second bracket 240. One of the third roller 210 and the fourth roller 220 is fixedly mounted on the second bracket 240, and the other roller is movably mounted on the second bracket 240 along a second direction Y2. The second direction Y2 is perpendicular to the axis of the fixed roller.

[0104] The second bracket 240 can be made of one component or a combination of multiple components according to the needs of use. The specific structure can be determined according to the needs of use.

[0105] One of the third roller 210 and the fourth roller 220 is fixedly mounted on the second bracket 240, and the other roller is movably mounted on the second bracket 240 along the second direction Y2. There are two situations: first, the third roller 210 is fixedly mounted on the second bracket 240, and the fourth roller 220 is movably mounted on the second bracket 240 along the second direction Y2 (a direction perpendicular to the axial direction of the third roller 210); second, the fourth roller 220 is fixedly mounted on the second bracket 240, and the third roller 210 is movably mounted on the second bracket 240 along the second direction Y2 (i.e., a direction perpendicular to the axial direction of the fourth roller 220).

[0106] The above-mentioned fixed installation on the second bracket 240 means that after the corresponding roller is installed on the second bracket 240, it only has the freedom to rotate around its own axis, and does not have the freedom to move relative to the second bracket 240 in a direction perpendicular to its own axis.

[0107] The solution provided in this embodiment can make the width b of the second gap 230 adjustable, so that the compacting mechanism 200 can be adapted to the processing needs of the first material 300 of different thicknesses, thereby broadening the applicable scope of the compacting mechanism 200 to a certain extent.

[0108] In some embodiments, the compacting mechanism 200 further includes a second movable bracket 250. The second movable bracket 250 is movably mounted on the second bracket 240 along the second direction Y2. The movable roller is fixedly mounted on the second movable bracket 250.

[0109] The second movable bracket 250 can be made of one component or a combination of multiple components according to the needs of use. The specific structure can be determined according to the needs of use.

[0110] The movable roller is fixedly installed on the second movable bracket 250, which means that the above-mentioned roller capable of moving along the second direction Y2 relative to the second bracket 240 is installed on the second movable bracket 250, and the roller only has the freedom to rotate around its own axis relative to the second movable bracket 250, and does not have the freedom to move relative to the second movable bracket 250 in a direction perpendicular to its own axis.

[0111] Compared with the case where the movable roller is directly mounted on the second bracket 240 , the solution provided in this embodiment can make the position adjustment of the movable roller easier to operate.

[0112] In some embodiments, the compacting mechanism 200 further includes a second linear drive mechanism 260. The second linear drive mechanism 260 is mounted on the second bracket 240, and a driving end of the second linear drive mechanism 260 is connected to the second movable bracket 250 for driving the second movable bracket 250 to move.

[0113] The second linear drive mechanism 260 in this embodiment can be a pneumatic cylinder, a hydraulic cylinder, or other linear drive mechanisms, and can be composed of one component or multiple components, depending on the specific usage requirements.

[0114] When in use, the second linear drive mechanism 260 can be controlled to operate to control the second movable bracket 250 to move relative to the second bracket 240 , thereby adjusting the width of the first gap 130 between the third roller 210 and the fourth roller 220 .

[0115] The solution provided in this embodiment further improves the degree of automation of the compacting mechanism 200 , making the width adjustment of the first gap 130 more convenient and accurate.

[0116] In some embodiments, the second linear drive mechanism 260 includes a pneumatic cylinder, a hydraulic cylinder, and / or a servo motor linear drive.

[0117] The solutions provided in this embodiment include but are not limited to the following situations: First, the second linear drive mechanism 260 includes only a pneumatic cylinder, wherein the number of the cylinders can be one or more; second, the second linear drive mechanism 260 includes only a hydraulic cylinder, wherein the number of the hydraulic cylinders can be one or more; third, the second linear drive mechanism 260 includes both a pneumatic cylinder and a hydraulic cylinder, wherein the number of the cylinders and the number of the hydraulic cylinders can be one or more respectively; fourth, the second linear drive mechanism 260 includes only a servo motor linear drive, wherein the number of the servo motor linear drive can be one or more; fifth, the second linear drive mechanism 260 includes both a pneumatic cylinder and a servo motor linear drive, wherein the number of the cylinders and the number of the servo motor linear drive can be one or more respectively; sixth, the second linear drive mechanism 260 includes both a hydraulic cylinder and a servo motor linear drive, wherein the number of the hydraulic cylinders and the number of the servo motor linear drive can be one or more respectively; seventh, the second linear drive mechanism 260 includes a pneumatic cylinder, a hydraulic cylinder and a servo motor linear drive, wherein the number of the cylinder, the hydraulic cylinder and the servo motor linear drive can be one or more respectively.

[0118] The second linear drive mechanism 260 adopts the solution provided in this embodiment, which has a simple structure and is easy to install.

[0119] As shown in Figure 7, in some embodiments, the compacting mechanism 200 further includes a fixing structure 270. The fixing structure 270 is used to fix the position of the movable roller after it is moved into position.

[0120] The fixing structure 270 can be set up in a variety of ways, such as including a bolt threadedly connected to the second bracket 240, or including a fixing block magnetically mounted on the second bracket 240. Other structures and settings can also be used, as long as the fixing structure 270 can fix the position of the movable roller after it moves into place.

[0121] By adopting the solution provided in this embodiment, the movable roller body can be fixed in relative position with the second bracket 240 and the fixedly installed roller body after being moved into position, thereby enabling the compacting mechanism 200 to perform processing operations stably.

[0122] As shown in Figures 7 and 8, in some embodiments, the fixed structure 270 includes a first support portion 271 and a second support portion 272. The first support portion 271 is fixedly mounted on the second bracket 240 and is located on a side of the second movable bracket 250 away from the second linear drive mechanism 260. The first support portion 271 is spaced apart from the second movable bracket 250, with a third gap 273 therebetween.

[0123] The second support portion 272 is used to be installed in the third gap 273 after the movable roller body moves to its position, and abuts against the second movable bracket 250 and the first support portion 271 respectively.

[0124] The first support portion 271 may be composed of one component or multiple components, may be integrally formed on the second bracket 240 , or may be an independently provided component, and the specific configuration may be determined based on usage requirements.

[0125] The second support portion 272 can be composed of a single component or multiple components and can be movably mounted on the first support portion 271 or be a separate component, depending on the specific needs. The shape and size of the second support portion 272 can be the same as or different from the shape and size of the third gap 273. It is understood that when the shape and size of the second support portion 272 are the same as the shape and size of the third gap 273, the second support portion 272 can completely fill the third gap 273 after being installed in the third gap 273. When at least one parameter of the shape and size of the second support portion 272 differs from the corresponding parameter of the third gap 273, the second support portion 272 can only partially fill the third gap 273 after being installed in the third gap 273. Regardless of the method, as long as the second support portion 272 is installed in the third gap 273, it can support the second movable bracket 250 and cooperate with the second linear drive mechanism 260 to determine the position of the second movable bracket 250.

[0126] The fixing structure 270 adopts the structure provided in this embodiment, which has a simple structure and is easy to prepare and install.

[0127] In some embodiments, as shown in FIG8 , along the third direction Z, the third gap 273 has a first end 274 and a second end 275 that are oppositely disposed, and the width of the third gap 273 gradually decreases from the first end 274 to the second end 275. The width of the third gap 273 refers to the distance between a surface of the second movable bracket 250 facing the first support portion 271 and a surface of the first support portion 271 facing the second movable bracket 250.

[0128] The second support portion 272 is inserted into the third gap 273 from the first end 274. Along the third direction, the cross-sectional area of ​​the second support portion 272 gradually increases from the insertion end toward the other end. The cross-sectional area of ​​the second support portion 272 refers to a cross-section obtained by cutting the second support portion 272 along a plane perpendicular to the third direction.

[0129] The solution provided in this embodiment facilitates the installation of the second support portion 272 and can improve production efficiency to a certain extent.

[0130] In some embodiments, the surface of the second movable bracket 250 facing the first support portion 271 is a horizontal plane. The surface of the first support portion 271 facing the second movable bracket 250 is an inclined surface. The surface of the second support portion 272 that contacts the second movable bracket 250 is a horizontal plane, and the surface that contacts the first support portion 271 is an inclined surface.

[0131] A horizontally arranged plane means that the plane is arranged parallel to the horizontal plane. An inclined plane means that the surface is arranged at a non-zero or non-90 degree angle to the horizontally arranged plane.

[0132] By adopting the solution provided in this embodiment, the second support part 272 can achieve surface contact with the first support part 271 and the second movable bracket 250 respectively, so that the friction between the second support part 272 and the second movable bracket 250 and the first support part 271 can be greater after installation, thereby achieving stable support for the second movable bracket 250.

[0133] In some embodiments, the second support portion 272 is a wedge-shaped block. By adopting the solution provided by this embodiment, the second support portion 272 has a simple and stable structure, and is easy to prepare and operate.

[0134] In some embodiments, as shown in FIG7 , the compacting mechanism 200 further includes an adjusting assembly 280 . The adjusting assembly 280 is mounted on the second bracket 240 . A driving end of the adjusting assembly 280 is connected to the second support portion 272 for driving the second support portion 272 to be inserted into the third gap 273 .

[0135] The adjustment component 280 can be composed of a single body or multiple parts, depending on the specific needs of use. For example, the adjustment component 280 can be a sliding part that is slidably set on the second bracket 240, a threaded part that is threadedly connected to the second bracket 240, etc., as long as the adjustment component 280 can push the second support part 272 to be inserted into the third gap 273.

[0136] The arrangement of the adjusting component 280 facilitates the insertion of the second supporting portion 272 into the third gap 273 , which can improve the processing efficiency of the first material 300 to a certain extent.

[0137] 7 , the adjustment assembly 280 includes a first adjustment portion 281 and a second adjustment portion 282. The first adjustment portion 281 is fixedly mounted on the second bracket 240. The second adjustment portion 282 is threadedly connected to the first adjustment portion 281 and abuts against the second support portion 272.

[0138] The first adjusting portion 281 may be composed of one component or multiple components, may be integrally formed on the second bracket 240 , or may be an independently provided component, and the specific configuration may be determined based on usage requirements.

[0139] The second adjusting portion 282 can be a bolt, a screw or other component with a threaded structure that is threadedly connected to the first adjusting portion 281 , and the specific structure can be determined according to usage requirements.

[0140] During use, when the second support part 272 needs to be inserted into the third gap 273, a part of the second support part 272 can be inserted into the third gap 273 first, and the end of the second support part 272 not inserted into the third gap 273 can be abutted against the second adjustment part 282. Then, by rotating the second adjustment part 282, it pushes the second support part 272 to gradually enter the third gap 273 until the second support part 272 abuts against the first support part 271 and the second movable bracket 250 respectively, and can no longer be pushed into the third gap 273.

[0141] The adjustment component 280 adopts the structure provided in this embodiment, which is simple in structure and easy to operate.

[0142] In some embodiments, the first adjusting portion 281 includes a protrusion protruding from the second bracket 240. The protrusion is provided with a threaded hole. The second adjusting portion 282 includes a bolt threadedly connected to the threaded hole.

[0143] The protrusion in this embodiment can be integrally formed on the second bracket 240, or can be installed on the second bracket 240 by threaded connection, plug-in connection, etc., and the specific method can be determined according to usage requirements.

[0144] By adopting the solution provided in this embodiment, the structures of the first adjustment portion 281 and the second adjustment portion 282 are relatively simple, and are easy to install and operate.

[0145] According to some embodiments of the present application, the present application also provides a battery production system, including a convex forming device according to any of the above schemes.

[0146] The battery production system generally also includes a winding device. The battery production system provided in the embodiment of the present application adds a set of convex forming mechanisms and compacting mechanisms in front of the winding device, so that the thickness of different areas of the first material after passing through the convex forming device is comparable, which can reduce the risk of defective products such as tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding quality rate of the electrode assemblies to a certain extent. At the same time, the battery production system provided in the embodiment of the present application is highly compatible with the thickness of the incoming electrode materials, so that electrodes of different thicknesses can be mixed and matched, and the manpower and factory area required for the grading of the electrodes can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0147] According to some embodiments of the present application, the present application further provides a winding method. As shown in FIG9 , the winding method includes:

[0148] S1, provide pole pieces and diaphragms;

[0149] S2. Processing is performed using the convexification device provided in any of the above embodiments;

[0150] S3, winding forming.

[0151] Through the winding method provided in the embodiment of the present application, the thickness of different areas of the first material can be obtained to be comparable, which can reduce the risk of defective products such as tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding quality of the electrode assemblies to a certain extent, and has strong compatibility with the thickness of the incoming electrode materials, so that electrodes of different thicknesses can be mixed and matched, and the manpower and factory area required for the grading and matching of the electrodes can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0152] According to some embodiments of the present application, a convex forming device is provided. As shown in Figures 1 to 8, the convex forming device includes a convex forming mechanism 100 and a compacting mechanism 200, which are sequentially arranged along a conveying direction X of a first material 300. The convex forming mechanism 100 is used to form an overpressure bump 310 on the first material 300, wherein the height h of the overpressure bump 310 is greater than the height of a preset bump, which is the desired bump of the first material 300. The compacting mechanism 200 is used to apply pressure to the overpressure bump 310 toward a first surface 320 of the first material 300, so that the thickness a of the first material 300 reaches a preset value.

[0153] The embossing mechanism 100 includes a first roller 110 and a second roller 120 spaced apart from each other. A first gap 130 is defined between the first roller 110 and the second roller 120 for passage of a first material 300. At least one of the first roller 110 and the second roller 120 is provided with a raised portion 140. In some embodiments, one of the first roller 110 and the second roller 120 is provided with a raised portion 140, while the other roller is provided with an elastic layer 150 for contact with the first material 300. In other embodiments, both the first roller 110 and the second roller 120 are provided with a raised portion 140, and the raised portions 140 on the first roller 110 and the second roller 120 are staggered.

[0154] The convex forming mechanism 100 further includes a first bracket 160. One of the first roller 110 and the second roller 120 is fixedly mounted on the first bracket 160, and the other roller is movably mounted on the first bracket 160 along the first direction Y1. The convex forming mechanism 100 further includes a first movable bracket 170. The first movable bracket 170 is movably mounted on the first bracket 160 along the first direction Y1, and the movable roller is mounted on the first movable bracket 170.

[0155] The convexification mechanism 100 further includes a first linear drive mechanism 180, which is mounted on the first bracket 160. The driving end of the first linear drive mechanism 180 is connected to the first movable bracket 170 for driving the first movable bracket 170 to move. The first linear drive mechanism 180 may include a pneumatic cylinder, a hydraulic cylinder, and / or a servo motor linear drive, etc.

[0156] The compacting mechanism 200 includes a third roller 210 and a fourth roller 220 spaced apart from each other, and a second gap 230 is provided between the third roller 210 and the fourth roller 220 for allowing the first material 300 to pass through. The width b of the second gap 230 is smaller than the thickness a of the first material 300 output by the embossing mechanism 100.

[0157] The compacting mechanism 200 further includes a second bracket 240 , one of the third roller 210 and the fourth roller 220 is fixedly mounted on the second bracket 240 , and the other roller is movably mounted on the second bracket 240 along the second direction Y2 .

[0158] The compacting mechanism 200 further includes a second movable bracket 250 , which is movably mounted on the second bracket 240 along the second direction Y2 , and a movable roller is rotatably mounted on the second movable bracket 250 .

[0159] The compacting mechanism 200 further includes a second linear drive mechanism 260, which is mounted on the second bracket 240. The driving end of the second linear drive mechanism 260 is connected to the second movable bracket 250 for driving the second movable bracket 250 to move. The second linear drive mechanism 260 may include a pneumatic cylinder, a hydraulic cylinder, and / or a servo motor linear drive.

[0160] The compacting mechanism 200 also includes a fixing structure 270, which is used to secure the movable roller in place after it has been moved into position. The fixing structure 270 includes a first support portion 271 and a second support portion 272. The first support portion 271 is fixedly mounted on the second bracket 240 and is located on the side of the second movable bracket 250 away from the second linear drive mechanism 260. The first support portion 271 is spaced apart from the second movable bracket 250, with a third gap 273 defined between them. The second support portion 272 is designed to fit within the third gap 273 after the movable roller has been moved into position, abutting against the second movable bracket 250 and the first support portion 271, respectively.

[0161] Along the third direction Z, the third gap 273 has a first end 274 and a second end 275 that are opposite each other. The width of the third gap 273 gradually decreases from the first end 274 to the second end 275. The second support portion 272 is configured to be inserted into the third gap 273 from the first end 274. The cross-sectional area of ​​the second support portion 272 gradually increases from the insertion end toward the other end along the third direction.

[0162] The surface of the second movable bracket 250 facing the first support portion 271 is flat, while the surface of the first support portion 271 facing the second movable bracket 250 is inclined. The surface of the second support portion 272 that contacts the second movable bracket 250 is flat, while the surface that contacts the first support portion 271 is inclined. The second support portion 272 is a wedge-shaped block.

[0163] The compacting mechanism 200 further includes an adjusting assembly 280 , which is mounted on the second bracket 240 . A driving end of the adjusting assembly 280 is connected to the second supporting portion 272 for driving the second supporting portion 272 to be inserted into the third gap 273 .

[0164] The adjustment assembly 280 includes a first adjustment portion 281 and a second adjustment portion 282. The first adjustment portion 281 is fixedly mounted on the second bracket 240, and the second adjustment portion 282 is threadedly connected to the first adjustment portion 281. The second adjustment portion 282 abuts against the second support portion 272. The first adjustment portion 281 includes a protrusion protruding from the second bracket 240, and the protrusion is provided with a threaded hole. The second adjustment portion 282 includes a bolt threadedly connected to the threaded hole.

[0165] The rollers used for the first roller body 110 , the second roller body 120 , the third roller body 210 and the fourth roller body 220 may be made of metal, rubber, nylon, non-metal or the like.

[0166] The convexing device provided in this embodiment is not only applicable to cathode and anode pole pieces, but also applicable to pole pieces and diaphragm assemblies by adjusting the width of the first gap and the width of the second gap. When in use, by increasing the pressure of the first linear drive mechanism in the convexing mechanism, the first material can produce a series of regularly arranged overvoltage convex points after passing through the convexing mechanism. The first material after excessive convexing passes through the compacting mechanism, and the rolling will squeeze the overvoltage convex points back into the interior of the first material, forming a first material with consistent thickness and meeting the process requirements. The thickness of the first material after compaction is consistent, so that the electrode assembly that is wound up will not have the phenomenon of tab misalignment.

[0167] The convex forming device provided in this embodiment is highly compatible with the thickness of the incoming electrode sheet, and can form an electrode sheet with a stable thickness after passing through the mechanism.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A convexity device, characterized in that: It includes a convexing mechanism and a compacting mechanism which are sequentially arranged along the conveying direction of the first material, the convexing mechanism is used to prepare overpressure convex points on the first material, the height of the overpressure convex points is greater than the height of preset convex points, the preset convex points are the convex points required for the first material, and the compacting mechanism is used to apply pressure to the overpressure convex points toward the main body of the first material so that the thickness of the first material reaches a preset value.

2. The convexity-making device according to claim 1, characterized in that: The convex forming mechanism comprises a first roller body and a second roller body spaced apart from each other, a first gap for the first material to pass through is provided between the first roller body and the second roller body, and a convex portion is provided on at least one of the first roller body and the second roller body.

3. The convexity-making device according to claim 2, characterized in that: One of the first roller body and the second roller body is provided with a protrusion, and the surface of the other roller body is provided with an elastic layer for contacting with the first material.

4. The convexity-making device according to claim 2, characterized in that: The first roller body and the second roller body are both provided with raised parts, and the raised parts on the first roller body and the raised parts on the second roller body are staggered.

5. The convexity-making device according to any one of claims 2 to 4, characterized in that: The camming mechanism also includes a first bracket, one of the first roller and the second roller is fixedly mounted on the first bracket, and the other roller is movably mounted on the first bracket along a first direction; wherein the first direction is perpendicular to the axial direction of the fixedly mounted roller.

6. The convexity-making device according to claim 5, characterized in that: The camming mechanism also includes a first movable bracket, which is movably mounted on the first bracket along the first direction, and a movable roller is fixedly mounted on the first movable bracket.

7. The convexity-making device according to claim 6, characterized in that: The convexing mechanism also includes a first linear driving mechanism, which is installed on the first bracket, and a driving end of the first linear driving mechanism is connected to the first movable bracket for driving the first movable bracket to move.

8. The convexity-making device according to any one of claims 1 to 7, characterized in that: The compacting mechanism includes a third roller and a fourth roller spaced apart from each other, wherein a second gap is provided between the third roller and the fourth roller for allowing the first material to pass through, and a width of the second gap is smaller than a thickness of the first material output by the convexing mechanism.

9. The convexity-making device according to claim 8, characterized in that: The compacting mechanism also includes a second bracket, one of the third roller and the fourth roller is fixedly mounted on the second bracket, and the other roller is movably mounted on the second bracket along a second direction; wherein the second direction is perpendicular to the axial direction of the fixedly mounted roller.

10. The convexity-making device according to claim 9, characterized in that: The compacting mechanism further includes a second movable bracket, the second movable bracket is movably mounted on the second bracket along the second direction, and a movable roller is fixedly mounted on the second movable bracket.

11. The convexity-making device according to claim 10, characterized in that: The compacting mechanism further includes a second linear drive mechanism, which is mounted on the second bracket, and a driving end of the second linear drive mechanism is connected to the second movable bracket for driving the second movable bracket to move.

12. The convexity-making device according to claim 11, characterized in that: The compacting mechanism further comprises a fixing structure, and the fixing structure is used to fix the position of the movable roller after the movable roller is moved into position.

13. The convexity-making device according to claim 12, characterized in that: The fixed structure includes a first supporting portion and a second supporting portion, the first supporting portion is fixedly mounted on the second bracket and is located on a side of the second movable bracket away from the second linear drive mechanism, the first supporting portion and the second movable bracket are spaced apart, and a third gap is formed between the first supporting portion and the second movable bracket; The second supporting portion is used to be installed in the third gap after the movable roller body moves into position, and abuts against the second movable bracket and the first supporting portion respectively.

14. The convexity-making device according to claim 13, characterized in that: Along the third direction, the third gap has a first end and a second end that are oppositely disposed, and a width of the third gap gradually decreases from the first end to the second end; The second support portion is used to be inserted into the third gap from the first end; and along the third direction, the cross-sectional area of ​​the second support portion gradually increases from the insertion end to the other end.

15. The convexity-making device according to claim 13, characterized in that: The side of the second movable bracket opposite to the first supporting part is a horizontally arranged plane, and the side of the first supporting part opposite to the second movable bracket is an inclined surface; the side of the second supporting part used for contacting the second movable bracket is a horizontally arranged plane, and the side used for contacting the first supporting part is an inclined surface.

16. The convexity-making device according to claim 15, characterized in that: The second supporting portion is a wedge-shaped block.

17. The convexity-making device according to any one of claims 13 to 16, characterized in that: The compacting mechanism further includes an adjusting component, which is mounted on the second bracket. A driving end of the adjusting component is connected to the second supporting portion and is used to drive the second supporting portion to be inserted into the third gap.

18. The convexity-making device according to claim 17, characterized in that: The adjustment assembly includes a first adjustment portion and a second adjustment portion, the first adjustment portion is fixedly mounted on the second bracket, the second adjustment portion is threadedly connected to the first adjustment portion, and the second adjustment portion abuts against the second support portion.

19. The convexity-making device according to claim 18, characterized in that: The first adjusting portion includes a convex portion protruding from the second bracket, the convex portion is provided with a threaded hole, and the second adjusting portion includes a bolt threadedly connected to the threaded hole.

20. A battery production system, characterized in that: Including the convexity creation device described in any one of claims 1-19.

21. A winding method, characterized in that: include: Provide pole pieces and diaphragms; Processed by a convexification device according to any one of claims 1 to 19; Winding forming.

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