Bump forming device, battery production system, and winding method

Abstract

The application belongs to the technical field of battery production equipment, and provides a convex forming device, a battery production system and a winding method. The convex forming device comprises a convex forming mechanism and a compaction mechanism arranged in sequence along the conveying direction of the first material. The convex forming mechanism is used for preparing over-pressing convex points on the first material. The height of the over-pressing convex points is greater than the height of preset convex points. The preset convex points are the required convex points of the first material. The compaction mechanism is used for applying pressure to the over-pressing convex points towards the main body of the first material, so that the thickness of the first material reaches a preset value. The convex forming device, the battery production system and the winding method provided by the application can improve the consistency of the thickness of the pole piece and reduce the risk of dislocation of the tab.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery production equipment, and particularly relates to a convexity forming device, a battery production system and a winding method. BACKGROUND

[0002] The winding type electrode assembly generally comprises negative electrode sheets, positive electrode sheets and separators arranged in a preset order. The thickness of the electrode sheet is generally greater than that of the separator, and the electrode sheet is generally provided with an electrode lug, and multiple electrode lugs are often arranged on the same electrode sheet. However, in the current production of the winding type electrode assembly, the position of the electrode lug is prone to misalignment. SUMMARY

[0003] In view of the above problems, the application provides a convexity forming device, a battery production system and a winding method, aiming to improve the technical problem that the position of the electrode lug in the winding type electrode assembly is prone to misalignment.

[0004] In a first aspect, the application provides a convexity forming device, comprising a convexity forming mechanism and a compaction mechanism arranged in sequence along the conveying direction of a first material, the convexity forming mechanism is used for preparing an over-pressing convex point on the first material, the height of the over-pressing convex point is greater than the height of a preset convex point, the preset convex point is the required convex point of the first material, and the compaction mechanism is used for applying a pressure towards the main body part of the first material to the over-pressing convex point, so that the thickness of the first material reaches a preset value.

[0005] The application provides a convexity forming device, which is provided with a convexity forming mechanism and a compaction mechanism arranged in sequence along the conveying direction of a first material, and changes the convexity forming process in the related art that directly prepares a preset convex point through the convexity forming mechanism, but first prepares an over-pressing convex point with a height greater than that of the preset convex point on the first material through two steps, and then applies a pressure to the over-pressing convex point through the compaction mechanism, so that the height of the convex point on the first material is reduced, thereby making the thickness of the first material reach a preset value. In this way, even if the thickness of the first material before the convexity forming device is uneven, the thickness of different regions of the first material after the convexity forming device can be made to be equivalent, which can reduce the risk of generating defective products such as electrode lug misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding efficiency of the electrode assembly to a certain extent. At the same time, the convexity forming device provided in the application has strong compatibility with the thickness of the electrode sheet, so that electrode sheets of different thicknesses can be mixed and matched, and the manpower and factory area required for electrode sheet grading can be cancelled or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0006] In some embodiments, the protrusion forming mechanism comprises a first roller body and a second roller body spaced apart from each other, a first gap between the first roller body and the second roller body for the first material to pass through, and protrusions on at least one of the first roller body and the second roller body. The protrusion forming mechanism provided in the embodiments has a simple structure, is easy to assemble, and is convenient for processing the first material.

[0007] In some embodiments, one of the first roller body and the second roller body is provided with protrusions, and the surface of the other roller body is provided with an elastic layer for contacting the first material. The protrusion forming mechanism provided in the embodiments has a simple structure, is easy to assemble, and is convenient for processing the first material.

[0008] In some embodiments, the first roller body and the second roller body are both provided with protrusions, and the protrusions on the first roller body and the protrusions on the second roller body are arranged in a staggered manner. This facilitates the first material to pass through the first gap and the preparation of overprotruding points.

[0009] In some embodiments, the protrusion forming mechanism further comprises a first support, one of the first roller body and the second roller body is fixedly installed on the first support, and the other roller body is movably installed on the first support in a first direction. The first direction is perpendicular to the axis direction of the fixedly installed roller body. The width of the first gap, i.e., the distance between the roller surface of the first roller body and the roller surface of the second roller body, can be adjusted by the scheme provided in the embodiments. This can make the protrusion forming mechanism applicable to the protrusion forming process of first materials of different thicknesses, and can expand the application range of the protrusion forming mechanism to a certain extent.

[0010] In some embodiments, the protrusion forming mechanism further comprises a first movable support movably installed on the first support in the first direction, and the movable roller body is fixedly installed on the first movable support. Compared with the movable roller body being directly installed on the first support, the position adjustment of the movable roller body is more convenient to operate by the scheme provided in the embodiments.

[0011] In some embodiments, the protrusion forming mechanism further comprises a first linear driving mechanism installed on the first support, and a driving end of the first linear driving mechanism is connected with the first movable support for driving the first movable support to move. The automation degree of the protrusion forming mechanism is further improved by the scheme provided in the embodiments, and the width adjustment of the first gap is more convenient and accurate.

[0012] In some embodiments, the compacting mechanism comprises a third roller body and a fourth roller body spaced apart from each other, and a second gap between the third roller body and the fourth roller body for the first material to pass through, the width of the second gap being smaller than the thickness of the first material output by the convex forming mechanism. The compacting mechanism adopts the structure provided in the embodiments, which is simple in structure, easy to assemble and process the first material.

[0013] In some embodiments, the compacting mechanism further comprises a second support, one of the third roller body and the fourth roller body being fixedly installed on the second support, and the other roller body being movably installed on the second support in a second direction; wherein the second direction is perpendicular to the axis direction of the fixedly installed roller body. The width b of the second gap can be adjusted by adopting the scheme provided in the embodiments. In this way, the compacting mechanism can be suitable for the processing needs of first materials of different thicknesses, and the application range of the compacting mechanism can be widened to a certain extent.

[0014] In some embodiments, the compacting mechanism further comprises a second movable support movably installed on the second support in the second direction, and the movable roller body is fixedly installed on the second movable support. Compared with the movable roller body being directly installed on the second support, the position adjustment of the movable roller body is more convenient to operate by adopting the scheme provided in the embodiments.

[0015] In some embodiments, the compacting mechanism further comprises a second linear driving mechanism installed on the second support, and a driving end of the second linear driving mechanism is connected with the second movable support for driving the second movable support to move. The automation degree of the compacting mechanism is further improved by adopting the scheme provided in the embodiments, and the width adjustment of the first gap is more convenient and accurate.

[0016] In some embodiments, the compacting mechanism further comprises a fixing structure for fixing the position of the movable roller body after the movable roller body is moved into position. The relative positions of the movable roller body, the second support and the fixedly installed roller body can be fixed after the movable roller body is moved into position by adopting the scheme provided in the embodiments, so that the processing operation of the compacting mechanism can be stably performed.

[0017] In some embodiments, the fixing structure comprises a first support part and a second support part, the first support part is fixedly installed on the second support, and is located on a side of the second moving support away from the second linear driving mechanism, the first support part is arranged apart from the second moving support, and a third gap is formed between the first support part and the second moving support; the second support part is used for being installed into the third gap after the movable roller body is moved into position, and abuts against the second moving support and the first support part respectively. The fixing structure adopts the structure provided in the embodiment, and has the advantages of simple structure, and convenience in preparation and installation.

[0018] In some embodiments, along a third direction, the third gap has a first end and a second end arranged oppositely, a width of the third gap gradually decreases from the first end to the second end; the second support part is used for being inserted into the third gap from the first end; and along the third direction, an area of a cross section of the second support part gradually increases from an insertion end to another end. The scheme provided in the embodiment facilitates installation of the second support part, and can improve production efficiency to a certain extent.

[0019] In some embodiments, a side of the second moving support opposite to the first support part is a horizontally arranged plane, a side of the first support part opposite to the second moving support is an inclined plane; a side of the second support part used for contacting the second moving support is a horizontally arranged plane, and a side used for contacting the first support part is an inclined plane. The scheme provided in the embodiment can make the second support part and the first support part and the second moving support achieve face contact respectively, so that the friction between the second support part and the second moving support and the first support part after installation is large, and the second moving support can be stably supported.

[0020] In some embodiments, the second support part is a wedge-shaped block. The scheme provided in the embodiment makes the second support part simple and stable in structure, and facilitates preparation and operation.

[0021] In some embodiments, the compacting mechanism further comprises an adjusting assembly, the adjusting assembly is installed on the second support, a driving end of the adjusting assembly is connected with the second support part, and the adjusting assembly is used for driving the second support part to be inserted into the third gap. The adjusting assembly facilitates insertion of the second support part into the third gap, and can improve processing efficiency of the first material to a certain extent.

[0022] In some embodiments, the adjusting assembly comprises a first adjusting part and a second adjusting part, the first adjusting part is fixedly installed on the second support, the second adjusting part is threadedly connected with the first adjusting part, and the second adjusting part abuts against the second support part. The adjusting assembly adopts the structure provided in the embodiment, and has the advantages of simple structure and convenience in operation.

[0023] In some embodiments, the first adjusting part comprises a convex part protruding from the second support, a threaded hole is arranged on the convex part, and the second adjusting part comprises a bolt threadedly connected with the threaded hole. By using the scheme provided in this embodiment, the structures of the first adjusting part and the second adjusting part are relatively simple, and the installation and operation are facilitated.

[0024] In a second aspect, the embodiments of the present application provide a battery production system, which comprises the tab forming device provided in any of the above embodiments. The battery production system provided in the embodiments of the present application increases a set of tab forming mechanism and compaction mechanism before the winding equipment, so that the thicknesses of different regions of the first material after the tab forming device are equivalent, which can reduce the risk of generating defective products such as tab misplacement to a certain extent, thereby improving the consistency of different electrode assemblies and the winding rate of the electrode assemblies to a certain extent. Meanwhile, the battery production system provided in the embodiments of the present application has high compatibility with the thickness of the electrode sheet, so that electrode sheets with different thicknesses can be mixed and matched, and the manpower and factory area required due to the grading arrangement of the electrode sheets can be cancelled or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0025] In a third aspect, the embodiments of the present application provide a winding method, which comprises: providing an electrode sheet and a separator; processing by the tab forming device provided in any of the above embodiments; and winding and forming. By using the winding method provided in the embodiments of the present application, the thicknesses of different regions of the first material can be equivalent, which can reduce the risk of generating defective products such as tab misplacement to a certain extent, thereby improving the consistency of different electrode assemblies and the winding rate of the electrode assemblies to a certain extent, and the compatibility with the thickness of the electrode sheet is high, so that electrode sheets with different thicknesses can be mixed and matched, the manpower and factory area required due to the grading arrangement of the electrode sheets can be cancelled or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0026] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented in accordance with the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limitations on the present application. Moreover, in all the drawings, like reference numerals refer to like parts throughout the several views. In the drawings:

[0028] Figure 1 Fig. 1 is a schematic diagram of the use state of the tab forming device of some embodiments of the present application;

[0029] Figure 2 A use state diagram of the convex creating device according to some embodiments of the present application;

[0030] Figure 3 A structure diagram of the first material according to some embodiments of the present application; Figure 2 A structure diagram of the first material according to some embodiments of the present application;

[0031] Figure 4 A front view structure diagram of the convex creating mechanism according to some embodiments of the present application;

[0032] Figure 5 A perspective structure diagram of the convex creating mechanism according to some embodiments of the present application;

[0033] Figure 6 A front view structure diagram of the compacting mechanism according to some embodiments of the present application;

[0034] Figure 7 A perspective structure diagram of the compacting mechanism according to some embodiments of the present application;

[0035] Figure 8 A side view structure diagram of the compacting mechanism according to some embodiments of the present application, in which the second support part is not shown;

[0036] Figure 9 A flow diagram of the winding method according to some embodiments of the present application.

[0037] Reference signs in the detailed description of the embodiments are as follows:

[0038] 100, convex creating mechanism; 110, first roller body; 120, second roller body; 130, first gap; 140, convex part; 150, elastic layer; 160, first support; 170, first moving support; 180, first linear driving mechanism;

[0039] 200, compacting mechanism; 210, third roller body; 220, fourth roller body; 230, second gap; 240, second support; 250, second moving support; 260, second linear driving mechanism; 270, fixed structure; 271, first support part; 272, second support part; 273, third gap; 274, first end; 275, second end; 280, adjusting assembly; 281, first adjusting part; 282, second adjusting part;

[0040] 300, first material; 310, overpressure convex point; 320, first surface;

[0041] X, conveying direction of the first material; h, height of the overpressure convex point; 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

[0042] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0045] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0047] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0051] The electrode assembly is an important part of the battery, which can be divided into wound electrode assembly and laminated electrode assembly according to the preparation method of the electrode assembly. Among them, the wound electrode assembly is widely used because of its simple operation and easy quality control.

[0052] The wound electrode assembly generally includes negative electrode sheet, positive electrode sheet and separator arranged in a predetermined order. Among them, the thickness of the electrode sheet is generally greater than that of the separator, and the electrode sheet is generally provided with an electrode lug, and a plurality of electrode lugs are often provided on the same electrode sheet. That is, a plurality of positive electrode lugs are generally provided on the positive electrode sheet, and a plurality of negative electrode lugs are generally provided on the negative electrode sheet. In the ideal state, after the electrode sheet and the separator are wound and formed, all the positive electrode lugs should be aligned, and all the negative electrode lugs should be aligned, but in actual production, especially in batch production, the thickness of each electrode sheet often cannot remain completely consistent, and the thickness of the same electrode sheet sometimes also has uneven conditions. This will cause the electrode lug position to be dislocated after the electrode sheet and the separator are wound and formed, resulting in the generation of defective products.

[0053] To improve the above problems, the application provides a convex forming device. The convex forming device is provided with a convex forming mechanism and a compaction mechanism arranged in sequence along the conveying direction of the first material. The convex forming process in the prior art is changed from directly forming the preset convex points through the convex forming mechanism to forming over-pressing convex points with a height greater than that of the preset convex points on the first material in two steps, and then applying pressure to the over-pressing convex points through the compaction mechanism to reduce the height of the convex points on the first material, so that the thickness of the first material reaches the preset value. In this way, even if the thickness of the first material before passing through the convex forming device is uneven, the thickness of the first material in different regions after passing through the convex forming device can be made to be equivalent, and the risk of generating defective products such as tab misplacement can be reduced to a certain extent, so that the consistency of the different electrode assemblies produced and the winding rate of the electrode assemblies can be improved to a certain extent. At the same time, the convex forming device provided by the application has high compatibility with the thickness of the pole piece, so that pole pieces of different thicknesses can be mixed and matched, and the labor and factory area required for pole piece grading can be cancelled or reduced to a certain extent, so that the winding efficiency can be improved to a certain extent.

[0054] The convex forming device disclosed in the application can be used in a winding device, a winding production line or a winding method. The winding device generally comprises a convex forming device. In addition, the winding device can also comprise a winding needle or other devices located downstream of the convex forming device. The convex forming device is used to make convex points on the positive pole piece, the negative pole piece or the combination of the pole piece and the separator, so as to make the thickness of the pole piece uniform, and the winding needle is used to wind and form the pole piece and the separator.

[0055] The winding production line generally comprises the above winding device. In addition, the winding production line can also comprise a feeding mechanism or other devices located upstream of the convex forming device. The feeding mechanism can comprise a first separator feeding mechanism, a first pole piece feeding mechanism and a second separator feeding mechanism. The above upstream of the convex forming device means that, in the production process, the relevant materials (such as the first separator, the first pole piece and the second separator) will pass through the feeding mechanism first and then pass through the convex forming device.

[0056] Please refer to Figures 1 to 3 The application provides a convex forming device. The convex forming device comprises a convex forming mechanism 100 and a compaction mechanism 200 arranged in sequence along the conveying direction X of a first material 300. The convex forming mechanism 100 is used to prepare over-pressing convex points 310 on the first material 300. The height h of the over-pressing convex points 310 is greater than the height of the preset convex points, and the preset convex points are the required convex points of the first material 300. The compaction mechanism 200 is used to apply pressure to the over-pressing convex points 310 towards a first surface 320 of the first material 300, so that the thickness a of the first material 300 reaches a preset value.

[0057] The convex forming device provided by the embodiments of the present application can be used in the preparation of electrode assemblies, and can also be used in the preparation of other materials. For the convenience of understanding, the use principle of the convex forming device is described below by taking the preparation of electrode assemblies as an example.

[0058] The first material 300 can be a single electrode tab, such as a positive electrode tab or a negative electrode tab; or a combination of any electrode tab and a separator, such as a positive electrode tab and a separator stacked together, or a negative electrode tab and a separator stacked together; or a positive electrode tab, a separator and a negative electrode tab stacked together; or a negative electrode tab, a separator, a positive electrode tab and a separator stacked together. The specific form can be determined according to the use requirement. As shown in FIG. 1, the positive electrode tab and the negative electrode tab each have a tab. Figure 3 As can be understood, Figure 3 As shown in FIG. 1, the first material 300 is in an unfinished state, and after the first material 300 is finished, convex points will be formed on the entire first surface 320.

[0059] The convex forming mechanism 100 and the compacting mechanism 200 arranged in sequence along the conveying direction X of the first material 300 mean that when the first material 300 is processed, the first material 300 will first pass through the convex forming mechanism 100, and then pass through the compacting mechanism 200.

[0060] The convex forming mechanism 100 can be composed of a single component or multiple components, such as a pressing plate or a pressing block with a convex portion, or can include two rotating rollers, at least one of which is provided with a convex portion, or can adopt other forms, as long as the over-pressing convex points 310 can be prepared on the first material 300.

[0061] As can be understood, the over-pressing convex points 310 are generally in a hemispherical convex structure, and can also be in a block-shaped convex structure, or other shapes of convex point structures, which can be determined according to the manufacturing process.

[0062] The height h of the over-pressing protrusion 310 refers to the dimension of the over-pressing protrusion 310 protruding 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 preset protrusion refers to the dimension of the preset protrusion protruding 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 over-pressing protrusion 310 is formed. The preset protrusion refers to the protrusion that should be formed on the first material 300 after the first material 300 passes through the entire protrusion forming device according to the processing requirement. It can be understood that the height h of the over-pressing protrusion 310 and the height of the preset protrusion can be a fixed value or a range value according to the requirement. When either the height h of the over-pressing protrusion 310 or the height of the preset protrusion is a range value, the height h of the over-pressing protrusion 310 is greater than the height of the preset protrusion, which means that the minimum value of the height h of the over-pressing protrusion 310 is greater than the maximum value of the height of the preset protrusion.

[0063] The compacting mechanism 200 can be formed by a single component or a combination of multiple components, such as a pressing plate, a pressing block, two rotating rollers, or other forms, as long as the compacting mechanism 200 can apply a pressure to the over-pressing protrusion 310 towards the first surface 320 of the first material 300, so that the thickness a of the first material 300 reaches the preset value. The thickness a of the first material 300 refers to the vertical distance between the highest point of the protrusion and the side of the first surface 320 of the first material 300 away from the highest point of the protrusion in the normal direction N of the first surface 320 of the first material 300. The protrusion refers to the protrusion formed by the over-pressing protrusion after passing through the compacting mechanism. The preset value refers to the thickness value of the first material 300 after passing through the entire protrusion forming device according to the processing requirement. It can be understood that the preset value can be a fixed value or a range value, which can be determined according to the requirement.

[0064] It can be understood that the pressure towards the first surface 320 of the first material 300 can be a force in the normal direction N of the first surface 320 of the first material 300, or a force with an angle to the normal direction N of the first surface 320 of the first material 300.

[0065] The use process of the protrusion forming device provided in the embodiment is as follows:

[0066] The first material 300, in a flat state, first passes through the station of the protrusion-forming mechanism 100. The protrusion-forming mechanism 100 protrudes the first material 300, creating overpressure protrusions 310. At this time, the thickness 'a' of the first material 300 is greater than a preset value. Then, the first material 300 with overpressure protrusions 310 is conveyed to the station of the compaction mechanism 200. The compaction mechanism 200 applies pressure to the overpressure protrusions 310 toward the first surface 320 of the first material 300, so that the height of the protrusions on the first material 300 decreases until the thickness 'a' of the first material 300 is consistent with or within the preset value.

[0067] The protrusion-making device provided in this application embodiment is provided with a protrusion-making mechanism 100 and a compaction mechanism 200 arranged sequentially along the conveying direction X of the first material 300. It changes the protrusion-making process in the related technology that directly produces the preset protrusion through the protrusion-making mechanism 100. Instead, it first produces an over-pressure protrusion 310 on the first material 300 with a height greater than the height of the preset protrusion through two steps. Then, the compaction mechanism 200 applies pressure to the over-pressure protrusion 310, so that the height of the protrusion on the first material 300 is reduced, thereby making the thickness a of the first material 300 reach the preset value. In this way, even if the thickness of the first material 300 is uneven before passing through the protrusion-making device, the thickness of different areas of the first material after passing through the protrusion-making device can be made to be similar. This can reduce the risk of producing defective products such as electrode tab misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding yield of the electrode assemblies to a certain extent. Meanwhile, the protrusion-making device provided in this application embodiment has strong compatibility with the thickness of the incoming electrode sheet, which allows electrode sheets of different thicknesses to be mixed and matched. This can eliminate or reduce the manpower and factory area required for electrode sheet grading and matching to a certain extent, thereby improving winding efficiency to a certain extent.

[0068] like Figure 4 and Figure 5 As shown, in some embodiments, the protrusion-forming mechanism 100 includes a first roller 110 and a second roller 120 spaced apart from each other. A first gap 130 is provided between the first roller 110 and the second roller 120 for the passage of a first material 300. At least one of the first roller 110 and the second roller 120 is provided with a protrusion 140.

[0069] The first roller body 110 can be set to one or more as needed, and the second roller body 120 can also be set to one or more as needed.

[0070] The first gap 130 is the gap between the roller surface of the first roller 110 and the roller surface of the second roller 120. The width of the first gap 130 can be equivalent to the thickness a of the first material 300, or it can be slightly smaller than the thickness a of the first material 300.

[0071] At least one of the first roller body 110 and the second roller body 120 is provided with the protruding part 140, which means that the first roller body 110 can be provided with the protruding part 140, and the second roller body 120 is not provided with the protruding part 140; or the first roller body 110 is not provided with the protruding part 140, and the second roller body 120 is provided with the protruding part 140; or both the first roller body 110 and the second roller body 120 are provided with the protruding part 140.

[0072] The protruding mechanism 100 adopts the structure provided in the embodiment, which is simple in structure, convenient to assemble and process the first material 300.

[0073] As shown in FIGS. 1, 2 and 3, in some embodiments, one of the first roller body 110 and the second roller body 120 is provided with the protruding part 140, and the surface of the other roller body is provided with the elastic layer 150 for contacting the first material 300. Figure 4 Figure 5 As shown in FIGS. 1, 2 and 3, in some embodiments, one of the first roller body 110 and the second roller body 120 is provided with the protruding part 140, and the surface of the other roller body is provided with the elastic layer 150 for contacting the first material 300.

[0074] The scheme provided in the embodiment includes two cases: first, the first roller body 110 is provided with the protruding part 140, and the surface of the second roller body 120 is provided with the elastic layer 150 for contacting the first material 300; second, the second roller body 120 is provided with the protruding part 140, and the surface of the first roller body 110 is provided with the elastic layer 150 for contacting the first material 300.

[0075] The elastic layer 150 can be made of different materials and arranged in different ways according to the needs of use, such as an elastic sleeve, such as a rubber sleeve, a composite material sleeve, etc., which is sleeved on the corresponding roller body, or an elastic coating, which is coated on the surface of the corresponding roller body, or other forms, which can be determined according to the needs of use.

[0076] The protruding mechanism 100 adopts the structure provided in the embodiment, which is simple in structure, convenient to assemble and process the first material 300.

[0077] In some embodiments, the first roller body 110 and the second roller body 120 are both provided with the protruding part 140, and the protruding part 140 on the first roller body 110 and the protruding part 140 on the second roller body 120 are arranged in a staggered manner.

[0078] The first roller body 110 and the second roller body 120 in the embodiment can be respectively made of hard materials, such as metal, non-metal, etc., or can be respectively made of materials with certain elasticity, such as rubber, nylon, etc.

[0079] ​The staggered arrangement refers to staggered arrangement of the protruding portions 140 on the first roller body 110 and the protruding portions 140 on the second roller body 120, so that any region of the first material 300 can only contact the protruding portions 140 on one of the roller bodies during processing, and cannot simultaneously contact the protruding portions 140 on both roller bodies, which facilitates the first material 300 to pass through the first gap 130 and the preparation of the overpressure protrusions 310.

[0080] As shown in Figure 4 and Figure 5 In some embodiments, the protrusion forming mechanism 100 further includes a first support 160. One of the first roller body 110 and the second roller body 120 is fixedly installed on the first support 160, and the other roller body is movably installed on the first support 160 along a first direction Y1. The first direction Y1 is perpendicular to the axis direction of the fixedly installed roller body.

[0081] The first support 160 can be made of one component according to the use requirement, or can be a combination of multiple components, which can be determined according to the use requirement.

[0082] The fixed installation of one of the first roller body 110 and the second roller body 120 on the first support 160 and the movable installation of the other roller body on the first support 160 along the first direction Y1 includes the following two cases: first, the first roller body 110 is fixedly installed on the first support 160, and the second roller body 120 is movably installed on the first support 160 along the first direction Y1 (i.e., the direction perpendicular to the axis direction of the first roller body 110); second, the second roller body 120 is fixedly installed on the first support 160, and the first roller body 110 is movably installed on the first support 160 along the first direction Y1 (i.e., the direction perpendicular to the axis direction of the second roller body 120).

[0083] The fixed installation on the first support 160 means that after the corresponding roller body is installed on the first support 160, it only has the freedom of rotating around its own axis, and does not have the freedom of moving relative to the first support 160 along the direction perpendicular to its own axis.

[0084] The scheme provided in the embodiment can make the width of the first gap 130 adjustable. The width of the first gap 130 refers to the distance between the roller surface of the first roller body 110 and the roller surface of the second roller body 120. In this way, the protrusion forming mechanism 100 can be applied to the protrusion forming process of first materials 300 of different thicknesses, and the application range of the protrusion forming mechanism 100 can be widened to a certain extent.

[0085] In some embodiments, the protrusion forming mechanism 100 further comprises a first moving support 170. The first moving support 170 is movably mounted on the first support 160 along the first direction Y1. The movable roller body is fixedly mounted on the first moving support 170.

[0086] The first moving support 170 can be made of one component or a combination of multiple components according to the use requirement.

[0087] The movable roller body fixedly mounted on the first moving support 170 means that the roller body capable of moving relative to the first support 160 along the first direction Y1 is fixedly mounted on the first moving support 170. The roller body has only the freedom of rotating around its own axis relative to the first moving support 170, and does not have the freedom of moving along the direction perpendicular to its own axis relative to the first moving support 170.

[0088] Compared with the movable roller body directly mounted on the first support 160, the position adjustment of the movable roller body is more convenient to operate by using the scheme provided in the embodiment.

[0089] In some embodiments, the protrusion forming mechanism 100 further comprises a first linear driving mechanism 180. The first linear driving mechanism 180 is mounted on the first support 160, and the driving end of the first linear driving mechanism 180 is connected with the first moving support 170 for driving the first moving support 170 to move.

[0090] The first linear driving mechanism 180 in the embodiment can be a gas cylinder, a hydraulic cylinder, or other linear driving mechanism, and can be composed of one component or multiple components according to the use requirement.

[0091] During use, the first linear driving mechanism 180 can be controlled to work to control the first moving support 170 to move relative to the first support 160, so as to realize the width adjustment of the first gap 130 between the first roller body 110 and the second roller body 120.

[0092] By using the scheme provided in the embodiment, the automation degree of the protrusion forming mechanism 100 is further improved, and the width adjustment of the first gap 130 is more convenient and accurate.

[0093] In some embodiments, the first linear driving mechanism 180 comprises a gas cylinder, a hydraulic cylinder, and / or a servo motor linear driver.

[0094] The solutions provided in this embodiment include, but are not limited to, the following: First, the first linear drive mechanism 180 includes only cylinders, wherein the number of cylinders can be one or more; Second, the first linear drive mechanism 180 includes only hydraulic cylinders, wherein the number of hydraulic cylinders can be one or more; Third, the first linear drive mechanism 180 includes both cylinders and hydraulic cylinders, wherein the number of cylinders and hydraulic cylinders can each be one or more; Fourth, the first linear drive mechanism 180 includes only servo motor linear drivers, wherein the number of servo motor linear drivers can each be one or more; Fifth, the first linear drive mechanism 180 includes both cylinders and servo motor linear drivers, wherein the number of cylinders and servo motor linear drivers can each be one or more; Sixth, the first linear drive mechanism 180 includes both hydraulic cylinders and servo motor linear drivers, wherein the number of hydraulic cylinders and servo motor linear drivers can each be one or more; Seventh, the first linear drive mechanism 180 includes cylinders, hydraulic cylinders, and servo motor linear drivers, wherein the number of cylinders, hydraulic cylinders, and servo motor linear drivers can each be one or more.

[0095] The first linear drive mechanism 180 adopts the solution provided in this embodiment, which has a simple structure and is easy to install.

[0096] like Figure 6 and Figure 7 As shown, in some embodiments, the compaction mechanism 200 includes a third roller 210 and a fourth roller 220 spaced apart from each other. A second gap 230 is provided between the third roller 210 and the fourth roller 220 for the passage of a first material 300. The width b of the second gap 230 is less than the thickness a of the first material 300 output by the compaction mechanism 200.

[0097] The third roller body 210 can be set to one or more as needed, and the fourth roller body 220 can also be set to one or more as needed.

[0098] The second gap 230 is the gap between the roller surface of the third roller 210 and the roller surface of the fourth roller 220. The width b of the second gap 230 refers to the distance between the roller surface of the third roller 210 and the roller surface of the fourth roller 220.

[0099] The compaction mechanism 200 adopts the structure provided in this embodiment, which is simple in structure and easy to assemble and process the first material 300.

[0100] In some embodiments, the compacting mechanism 200 further comprises a second support 240. One of the third roller body 210 and the fourth roller body 220 is fixedly installed on the second support 240, and the other roller body is movably installed on the second support 240 along a second direction Y2. The second direction Y2 is perpendicular to the axis direction of the fixedly installed roller body.

[0101] The second support 240 can be made of one component or a combination of multiple components according to the use requirement.

[0102] The third roller body 210 and the fourth roller body 220 are fixedly installed on the second support 240, and the other roller body is movably installed on the second support 240 along a second direction Y2. The second direction Y2 is perpendicular to the axis direction of the fixedly installed roller body.

[0103] The fixed installation on the second support 240 means that the corresponding roller body is installed on the second support 240 and only has the freedom of rotating around its own axis, and does not have the freedom of moving relative to the second support 240 along the direction perpendicular to its own axis.

[0104] The scheme provided in the embodiment can make the width b of the second gap 230 adjustable. In this way, the compacting mechanism 200 can be suitable for the processing needs of first materials 300 with different thicknesses, and can expand the application range of the compacting mechanism 200 to a certain extent.

[0105] In some embodiments, the compacting mechanism 200 further comprises a second moving support 250. The second moving support 250 is movably installed on the second support 240 along the second direction Y2. The movable roller body is fixedly installed on the second moving support 250.

[0106] The second moving support 250 can be made of one component or a combination of multiple components according to the use requirement.

[0107] The movable roller body is fixedly installed on the second moving support 250, which means that the above-mentioned roller body capable of moving relative to the second support 240 along the second direction Y2 is installed on the second moving support 250. The roller body relative to the second moving support 250 only has the freedom of rotating around its own axis, and does not have the freedom of moving relative to the second moving support 250 along the direction perpendicular to its own axis.

[0108] Compared with the movable roller body directly mounted on the second support 240, the position adjustment of the movable roller body is more convenient to operate by using the scheme provided in this embodiment.

[0109] In some embodiments, the compaction mechanism 200 further comprises a second linear drive mechanism 260. The second linear drive mechanism 260 is mounted on the second support 240, and the driving end of the second linear drive mechanism 260 is connected with the second moving support 250 for driving the second moving support 250 to move.

[0110] The second linear drive mechanism 260 in this embodiment can adopt a pneumatic cylinder, a hydraulic cylinder, or other linear drive mechanisms, and can be composed of one component or multiple components, which can be determined according to the use requirements.

[0111] In use, the second linear drive mechanism 260 can be controlled to work to control the second moving support 250 to move relative to the second support 240, so as to realize the width adjustment of the first gap 130 between the third roller body 210 and the fourth roller body 220.

[0112] The scheme provided in this embodiment further improves the automation degree of the compaction mechanism 200, and makes the width adjustment of the first gap 130 more convenient and accurate.

[0113] In some embodiments, the second linear drive mechanism 260 comprises a pneumatic cylinder, a hydraulic cylinder, and / or a servo motor linear drive.

[0114] The scheme provided in this embodiment includes but is not limited to the following cases: first, the second linear drive mechanism 260 only comprises a pneumatic cylinder, wherein the number of the pneumatic cylinders can be one or more; second, the second linear drive mechanism 260 only comprises a hydraulic cylinder, wherein the number of the hydraulic cylinders can be one or more; third, the second linear drive mechanism 260 comprises both a pneumatic cylinder and a hydraulic cylinder, wherein the number of the pneumatic cylinders and the number of the hydraulic cylinders can be one or more respectively; fourth, the second linear drive mechanism 260 only comprises a servo motor linear drive, wherein the number of the servo motor linear drives can be one or more; fifth, the second linear drive mechanism 260 comprises both a pneumatic cylinder and a servo motor linear drive, wherein the number of the pneumatic cylinders and the number of the servo motor linear drives can be one or more respectively; sixth, the second linear drive mechanism 260 comprises 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 drives can be one or more respectively; seventh, the second linear drive mechanism 260 comprises a pneumatic cylinder, a hydraulic cylinder, and a servo motor linear drive, wherein the number of the pneumatic cylinders, the number of the hydraulic cylinders, and the number of the servo motor linear drives can be one or more respectively.

[0115] The second linear driving mechanism 260 adopts the scheme provided in the embodiment, and has simple structure and is convenient to install.

[0116] As shown in Figure 7 some embodiments, the compaction mechanism 200 further comprises a fixing structure 270. The fixing structure 270 is used to fix the position of the movable roller body after the movable roller body is moved into position.

[0117] The fixing structure 270 can adopt various setting modes. For example, the fixing structure 270 can comprise a bolt screwed on the second support 240, can comprise a fixed block magnetically installed on the second support 240, or can adopt other structures and setting modes, as long as the fixing structure 270 can fix the position of the movable roller body after the movable roller body is moved into position.

[0118] By adopting the scheme provided in the embodiment, the relative position of the movable roller body to the second support 240 and the fixedly installed roller body can be fixed after the movable roller body is moved into position, so that the compaction mechanism 200 can be stably operated.

[0119] As shown in Figure 7 and Figure 8 some embodiments, the fixing structure 270 comprises a first support part 271 and a second support part 272. The first support part 271 is fixedly installed on the second support 240 and is located on the side of the second moving support 250 away from the second linear driving mechanism 260. The first support part 271 is arranged in a spaced manner with the second moving support 250, and has a third gap 273 between the first support part 271 and the second moving support 250.

[0120] The second support part 272 is used to be installed into the third gap 273 after the movable roller body is moved into position, and abuts against the second moving support 250 and the first support part 271, respectively.

[0121] The first support part 271 can be composed of one component or multiple components, and can be integrally formed on the second support 240 or can be an independently arranged member. The specific mode can be determined according to the use requirement.

[0122] The second support 272 can consist of one component or multiple components. It can be movably mounted on the first support 271 or be an independently set component, depending on the usage requirements. The shape and size of the second support 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 272 are the same as those of the third gap 273, the second support 272, after being installed in the third gap 273, can completely fill the third gap 273. When at least one parameter of the shape and size of the second support 272 is different from the corresponding parameter of the third gap 273, the second support 272, after being installed in the third gap 273, only fills a portion of the space in the third gap 273. Regardless of the method, as long as the second support 272, after being installed in the third gap 273, can support the second movable bracket 250 to cooperate with the second linear drive mechanism 260 to define the position of the second movable bracket 250, it is sufficient.

[0123] The fixed structure 270 adopts the structure provided in this embodiment, which is simple and easy to manufacture and install.

[0124] In some embodiments, such as Figure 8 As shown, along the third direction Z, the third gap 273 has a first end 274 and a second end 275 disposed opposite to each other, 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 the side of the second movable bracket 250 facing the first support portion 271 and the side of the first support portion 271 facing the second movable bracket 250.

[0125] 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 to the other end. The cross-section of the second support portion 272 refers to the cross-section obtained by cutting the second support portion 272 with a plane perpendicular to the third direction.

[0126] The solution provided in this embodiment facilitates the installation of the second support 272 and can improve production efficiency to a certain extent.

[0127] In some embodiments, the side of the second movable support 250 opposite to the first support 271 is a horizontally arranged plane. The side of the first support 271 opposite to the second movable support 250 is an inclined plane. The side of the second support 272 that contacts the second movable support 250 is a horizontally arranged plane, and the side that contacts the first support 271 is an inclined plane.

[0128] A horizontally set plane is one that is parallel to a horizontal plane. An inclined plane is one that forms a non-zero, non-90-degree angle with a horizontally set plane.

[0129] By adopting the scheme provided in the embodiment, the second support part 272 can realize surface contact with the first support part 271 and the second moving support 250 respectively, so that the friction between the second support part 272 and the second moving support 250 and the first support part 271 after installation can be large, thereby stably supporting the second moving support 250.

[0130] In some embodiments, the second support part 272 is a wedge-shaped block. By adopting the scheme provided in the embodiment, the second support part 272 has a simple and stable structure, and is convenient to prepare and operate.

[0131] In some embodiments, as shown in Figure 7 The compacting mechanism 200 further comprises an adjusting assembly 280. The adjusting assembly 280 is installed on the second support 240. The driving end of the adjusting assembly 280 is connected with the second support part 272, for driving the second support part 272 to insert into the third gap 273.

[0132] The adjusting assembly 280 can be composed of one piece or multiple parts, which can be determined according to the use requirement. For example, the adjusting assembly 280 can be a sliding piece slidingly arranged on the second support 240, a threaded piece screwedly connected with the second support 240, etc., as long as the second support part 272 can be pushed to insert into the third gap 273 through the adjusting assembly 280.

[0133] The adjusting assembly 280 is arranged to facilitate the insertion of the second support part 272 into the third gap 273, which can improve the processing efficiency of the first material 300 to a certain extent.

[0134] In some embodiments, as shown in Figure 7 The adjusting assembly 280 comprises a first adjusting part 281 and a second adjusting part 282. The first adjusting part 281 is fixedly installed on the second support 240. The second adjusting part 282 is screwedly connected with the first adjusting part 281, and the second adjusting part 282 abuts against the second support part 272.

[0135] The first adjusting part 281 can be composed of one part or multiple parts, and can be integrally formed on the second support 240 or independently arranged, which can be determined according to the use requirement.

[0136] The second adjusting part 282 can be a bolt, a screw rod or other member with a threaded structure screwedly connected with the first adjusting part 281, which can be determined according to the use requirement.

[0137] 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 adjusting part 282. Then, the second adjusting part 282 is rotated to push the second support part 272 into the third gap 273 gradually until the second support part 272 abuts against the first support part 271 and the second moving bracket 250 respectively, and cannot be pushed into the third gap 273 any more.

[0138] The adjusting assembly 280 has the structure provided in the embodiment, which is simple and convenient to operate.

[0139] In some embodiments, the first adjusting part 281 includes a convex part protruding from the second bracket 240. The convex part is provided with a threaded hole. The second adjusting part 282 includes a bolt threadedly connected with the threaded hole.

[0140] The convex part in the embodiment can be integrally formed on the second bracket 240, or can be installed on the second bracket 240 by means of threaded connection, plug-in connection or the like, which can be determined according to the use requirement.

[0141] The first adjusting part 281 and the second adjusting part 282 have simple structures according to the scheme provided in the embodiment, and are convenient to install and operate.

[0142] According to some embodiments of the application, the application further provides a battery production system including the convexity forming device of any of the above schemes.

[0143] The battery production system generally further includes a winding device. The battery production system provided in the embodiment of the application adds a set of convexity forming mechanism and compaction mechanism before the winding device, so that the thicknesses of different regions of the first material after the convexity forming device are substantially the same, which can reduce the risk of generating defective products such as tab misplacement to a certain extent, so as to improve the consistency of different electrode assemblies and the winding efficiency of the electrode assemblies to a certain extent. Meanwhile, the battery production system provided in the embodiment of the application has high compatibility with the thickness of the tab material, so that tabs with different thicknesses can be mixed and matched, and the manpower and factory area required for tab grading can be cancelled or reduced to a certain extent, so as to improve the winding efficiency to a certain extent.

[0144] According to some embodiments of the application, the application further provides a winding method. As shown in Figure 9 the winding method includes:

[0145] S1, providing a tab and a separator;

[0146] S2, processing by the convexity forming device provided in any of the above embodiments;

[0147] S3, winding forming.

[0148] By the winding method provided by the embodiments of the present application, the thickness of different regions of the first material can be made to be relatively uniform, the risk of generating defective products such as tab misplacement can be reduced to a certain extent, the consistency of different electrode assemblies generated and the winding yield of the electrode assembly can be improved to a certain extent, the thickness compatibility of the tab is extremely high, tabs of different thicknesses can be mixed and matched, the required manpower and factory area due to tab grading matching can be cancelled or reduced to a certain extent, and thus the winding efficiency can be improved to a certain extent.

[0149] According to some embodiments of the present application, a bumping device is provided. As shown in the drawings, the bumping device comprises a bumping mechanism 100 and a compacting mechanism 200 arranged in sequence along a conveying direction X of a first material 300, the bumping mechanism 100 is configured to prepare over-pressing bumps 310 on the first material 300, the height h of the over-pressing bumps 310 is greater than the height of a preset bump, and the preset bump is a required bump of the first material 300, and the compacting mechanism 200 is configured to apply a pressure to the over-pressing bumps 310 towards a first surface 320 of the first material 300, so that the thickness a of the first material 300 reaches a preset value. Figures 1 to 8 The bumping mechanism 100 comprises a first roller body 110 and a second roller body 120 spaced from each other, and a first gap 130 for the first material 300 to pass between the first roller body 110 and the second roller body 120, and at least one of the first roller body 110 and the second roller body 120 is provided with a protruding portion 140. In some embodiments, one of the first roller body 110 and the second roller body 120 is provided with the protruding portion 140, and the surface of the other roller body is provided with an elastic layer 150 for contacting the first material 300. In other embodiments, the first roller body 110 and the second roller body 120 are both provided with the protruding portion 140, and the protruding portions 140 on the first roller body 110 and the second roller body 120 are misaligned.

[0150] The bumping mechanism 100 further comprises a first bracket 160, one of the first roller body 110 and the second roller body 120 is fixedly installed on the first bracket 160, and the other roller body is movably installed on the first bracket 160 along a first direction Y1. The bumping mechanism 100 further comprises a first moving bracket 170, the first moving bracket 170 is movably installed on the first bracket 160 along the first direction Y1, and the movable roller body is installed on the first moving bracket 170.

[0151]

[0152] ​The convexity forming mechanism 100 further comprises a first linear driving mechanism 180, which is mounted on the first support 160 and has a driving end connected with the first moving support 170 for driving the first moving support 170 to move. The first linear driving mechanism 180 comprises a pneumatic cylinder, a hydraulic cylinder, a servo motor linear driver or the like.

[0153] The compacting mechanism 200 comprises a third roller body 210 and a fourth roller body 220 spaced apart from each other and having a second gap 230 between the third roller body 210 and the fourth roller body 220 for the first material 300 to pass through, the width b of the second gap 230 being smaller than the thickness a of the first material 300 output by the convexity forming mechanism 100.

[0154] The compacting mechanism 200 further comprises a second support 240, one of the third roller body 210 and the fourth roller body 220 is fixedly mounted on the second support 240, and the other roller body is movably mounted on the second support 240 along the second direction Y2.

[0155] The compacting mechanism 200 further comprises a second moving support 250, which is movably mounted on the second support 240 along the second direction Y2, and the movable roller body is rotatably mounted on the second moving support 250.

[0156] The compacting mechanism 200 further comprises a second linear driving mechanism 260, which is mounted on the second support 240 and has a driving end connected with the second moving support 250 for driving the second moving support 250 to move. The second linear driving mechanism 260 comprises a pneumatic cylinder, a hydraulic cylinder, a servo motor linear driver or the like.

[0157] The compacting mechanism 200 further comprises a fixing structure 270 for fixing the position of the movable roller body after it is moved into position. The fixing structure 270 comprises a first support part 271 and a second support part 272, the first support part 271 is fixedly mounted on the second support 240 and located on the side of the second moving support 250 away from the second linear driving mechanism 260, the first support part 271 is spaced apart from the second moving support 250 and has a third gap 273 therebetween. The second support part 272 is used to be mounted into the third gap 273 after the movable roller body is moved into position and abuts against the second moving support 250 and the first support part 271 respectively.

[0158] Along the third direction Z, the third gap 273 has oppositely arranged first and second ends 274 and 275, and 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; and along the third direction, the cross-sectional area of the second support portion 272 gradually increases from the insertion end to the other end.

[0159] The side of the second moving bracket 250 opposite to the first support portion 271 is a flat surface, and the side of the first support portion 271 opposite to the second moving bracket 250 is an inclined surface. The side of the second support portion 272 configured to contact the second moving bracket 250 is a flat surface, and the side configured to contact the first support portion 271 is an inclined surface. The second support portion 272 is a wedge-shaped block.

[0160] The compaction mechanism 200 further comprises an adjusting assembly 280 mounted on the second bracket 240, and a driving end of the adjusting assembly 280 is connected with the second support portion 272 for driving the second support portion 272 to be inserted into the third gap 273.

[0161] The adjusting assembly 280 comprises a first adjusting portion 281 fixedly mounted on the second bracket 240 and a second adjusting portion 282 threadedly connected with the first adjusting portion 281 and abutting against the second support portion 272. The first adjusting portion 281 comprises a protruding portion protruding from the second bracket 240, and a threaded hole is arranged on the protruding portion. The second adjusting portion 282 comprises a bolt threadedly connected with the threaded hole.

[0162] The roller materials used by the first roller body 110, the second roller body 120, the third roller body 210 and the fourth roller body 220 can be metal, rubber, nylon, non-metal and the like.

[0163] The convexity forming device provided by the embodiment can be applied to cathode and anode electrode sheets, and can also be applied to electrode sheet and diaphragm assemblies by adjusting the width of the first gap and the width of the second gap. When used, by increasing the pressure of the first linear driving mechanism in the convexity forming mechanism, the first material can generate a series of regularly arranged over-convex points after passing through the convexity forming mechanism. After the first material is excessively convex, the over-convex points are extruded back into the first material by the roller pressing of the compaction mechanism, thereby forming the first material with uniform thickness and meeting the process requirements. The first material after compaction has uniform thickness, so that the electrode assembly wound out does not have the phenomenon of misalignment of the tabs.

[0164] The convexity forming device provided by the embodiment has high compatibility with the thickness of the incoming electrode sheet, and can form an electrode sheet with stable thickness after passing through the mechanism.

[0165] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bulge forming device characterized by comprising: The embossing mechanism comprises a first roller body and a second roller body spaced apart from each other, and a first gap between the first roller body and the second roller body for the first material to pass through, and a protruding portion is arranged on at least one of the first roller body and the second roller body.

2. The device of claim 1, wherein, One of the first roller body and the second roller body is provided with a protruding portion, and the surface of the other roller body is provided with an elastic layer for contacting the first material.

3. The device of claim 2, wherein the protrusion is formed by a plurality of protrusion elements. The protruding portion on the first roller body and the protruding portion on the second roller body are arranged in a staggered manner.

4. The method of claim 2 wherein the step of forming the protrusion comprises the step of: The embossing mechanism further comprises a first support, one of the first roller body and the second roller body is fixedly installed on the first support, and the other roller body is movably installed on the first support in a first direction; wherein the first direction is perpendicular to the axis direction of the fixedly installed roller body.

5. A device for creating a protrusion as claimed in any of claims 2-4, characterized in that The embossing mechanism further comprises a first moving support, the first moving support is movably installed on the first support, and the movable roller body is fixedly installed on the first moving support.

6. The method of claim 5, wherein the protrusion forming device is a laser. The embossing mechanism further comprises a first linear driving mechanism, the first linear driving mechanism is installed on the first support, and the driving end of the first linear driving mechanism is connected with the first moving support for driving the first moving support to move.

7. The method of claim 6, wherein the protrusion forming device is a laser. The compaction mechanism comprises a third roller body and a fourth roller body spaced apart from each other, and a second gap between the third roller body and the fourth roller body for the first material to pass through, and the width of the second gap is smaller than the thickness of the first material output by the embossing mechanism.

8. A device for creating a protrusion according to any one of claims 1-7, characterized in that The compaction mechanism further comprises a second support, one of the third roller body and the fourth roller body is fixedly installed on the second support, and the other roller body is movably installed on the second support in a second direction; wherein the second direction is perpendicular to the axis direction of the fixedly installed roller body.

9. The apparatus of claim 8 wherein, The compaction mechanism further comprises a second moving support, the second moving support is movably installed on the second support in the second direction, and the movable roller body is fixedly installed on the second moving support.

10. The apparatus of claim 9 wherein, The compaction mechanism further comprises a second linear driving mechanism, the second linear driving mechanism is installed on the second support, and the driving end of the second linear driving mechanism is connected with the second moving support for driving the second moving support to move.

11. The method of claim 10, wherein the protrusion forming device is a laser. The compaction mechanism further comprises a fixing structure for fixing the position of the movable roller body after it is moved into position.

12. The method of claim 11 wherein the protrusion forming device is characterized by: ​ 13. The method of claim 12 wherein the protrusion forming device is a laser. The fixing structure comprises a first support part and a second support part, the first support part is fixedly installed on the second support, and is located on a side of the second moving support away from the second linear driving mechanism, the first support part is arranged apart from the second moving support, and a third gap is formed between the first support part and the second moving support; The second support part is used for being installed into the third gap after the movable roller body is moved into position, and abutting against the second moving support and the first support part respectively.

14. The method of claim 13, wherein the protrusion forming device is a laser. In the third direction, the third gap has oppositely arranged first and second ends, and the width of the third gap gradually decreases from the first end to the second end; The second support part is used for being inserted into the third gap from the first end, and in the third direction, the cross-sectional area of the second support part gradually increases from the insertion end to the other end.

15. The method of claim 13 wherein the protrusion forming device is a laser. The side of the second moving support opposite to the first support part is a horizontally arranged plane, the side of the first support part opposite to the second moving support is an inclined plane, the side of the second support part used for contacting the second moving support is a horizontally arranged plane, and the side of the second support part used for contacting the first support part is an inclined plane.

16. The method of claim 15, wherein the protrusion forming device is a laser. The second support part is a wedge-shaped block.

17. A protracting device according to any one of claims 13-16, characterized in that The compacting mechanism further comprises an adjusting assembly, the adjusting assembly is installed on the second support, the driving end of the adjusting assembly is connected with the second support part, and the adjusting assembly is used for driving the second support part to be inserted into the third gap.

18. The method of claim 17, wherein the protrusion forming device is a laser. The adjusting assembly comprises a first adjusting part and a second adjusting part, the first adjusting part is fixedly installed on the second support, the second adjusting part is threadedly connected with the first adjusting part, and the second adjusting part abuts against the second support part.

19. The apparatus of claim 18, wherein, The first adjusting part comprises a convex part protruding from the second support, a threaded hole is arranged on the convex part, and the second adjusting part comprises a bolt threadedly connected with the threaded hole.

20. A battery production system characterized by comprising: The device comprises the device for forming a convex part according to any one of claims 1-19.

21. A winding method, characterized by, The device comprises: Providing a pole piece and a diaphragm; Processing by the device for forming a convex part according to any one of claims 1-19; Winding and forming.

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