Convex manufacturing device, battery production system and winding method

Abstract

The invention is suitable for the technical field of battery production equipment, and provides a bulge making device, a battery production system and a winding method. The protrusion making device comprises a protrusion making mechanism and a compaction mechanism which are sequentially arranged in the conveying direction of the first material, the protrusion making mechanism is used for making overpressure protrusions on the first material, the height of the overpressure protrusions is larger than that of preset protrusions, and the preset protrusions are the protrusions needed by the first material; and the compaction mechanism is used for applying pressure towards the main body part of the first material to the overpressure salient points, so that the thickness of the first material reaches a preset value. According to the bulge making device, the battery production system and the winding method provided by the invention, the consistency of the thickness of the pole piece can be improved, and the risk of dislocation of the tab is reduced.

Description

Technical Field

[0001] 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

[0002] The wound electrode assembly generally includes a negative electrode sheet, a positive electrode sheet and a separator arranged in a preset order. 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 the same electrode sheet is often provided with multiple pole ears. However, in the current production of wound electrode assemblies, the problem of pole ear position misalignment is prone to occur. Summary of the invention

[0003] In view of the above problems, the present 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 tabs in a wound electrode assembly is easily misplaced.

[0004] In a 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 bulges on the first material, the height of the overpressure bulges being greater than the height of preset bulges, the preset bulges being the bulges required for the first material, and the compacting mechanism being used to apply pressure to the overpressure bulges toward the main body of the first material so that the thickness of the first material reaches a preset value.

[0005] The embodiment of the present application provides a convex device, which is provided with a convex mechanism and a compaction mechanism sequentially arranged along the conveying direction of the first material, and changes the convex process of directly making preset convex points 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 through two steps, and then pressure is applied to the overpressure convex point by the compaction mechanism, so that the height of the convex point on the first material is reduced, so that the thickness of the first material reaches the preset value, so that 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 ear misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding rate of 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 sheet, so that electrodes of different thicknesses can be mixed and matched, and the manpower and plant area required for the matching of electrode sheets can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0006] In some embodiments, the convex forming mechanism includes 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. The convex forming mechanism adopts the structure provided in this embodiment, which has a simple structure and is easy to assemble and process the first material.

[0007] In some embodiments, one of the first roller and the second roller is provided with a convex portion, and the surface of the other roller is provided with an elastic layer for contacting the first material. The convex mechanism adopts the structure provided in this embodiment, which is simple in structure and convenient for assembly and processing of 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 staggered, so as to facilitate the first material to pass through the first gap and the preparation of the overpressure convex point.

[0009] In some embodiments, the embossing mechanism further 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. By adopting the scheme provided in this embodiment, the width of the first gap can be adjusted. wherein 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. in this way, the embossing mechanism can be applied to the embossing process of first materials of different thicknesses, which can broaden the scope of application of the embossing mechanism to a certain extent.

[0010] In some embodiments, the convex forming mechanism further comprises a first movable bracket, the first movable bracket is movably mounted on the first bracket along the first direction, and the movable roller is fixedly mounted on the first movable bracket. Compared with the movable roller being directly mounted on the first bracket, the solution provided in this embodiment can make the position adjustment of the movable roller easier to operate.

[0011] In some embodiments, the convexing mechanism further includes a first linear driving mechanism, which is mounted 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. The solution provided in this embodiment further improves the automation of the convexing mechanism, making the width adjustment of the first gap more convenient and accurate.

[0012] In some embodiments, the compacting mechanism includes a third roller and a fourth roller spaced apart from each other, a second gap for the first material to pass through is provided between the third roller and the fourth roller, and the width of the second gap is smaller than the thickness of the first material output by the convex forming mechanism. The compacting mechanism adopts the structure provided in this embodiment, which is simple in structure and convenient for assembly and processing of the first material.

[0013] In some embodiments, the compaction mechanism further comprises 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. By adopting the solution provided in this embodiment, the width b of the second gap can be adjusted. In this way, the compaction mechanism can be applied to the processing needs of the first material of different thicknesses, and the application scope of the compaction mechanism can be widened to a certain extent.

[0014] In some embodiments, the compacting mechanism further comprises a second movable bracket, the second movable bracket is movably mounted on the second bracket along the second direction, and the movable roller is fixedly mounted on the second movable bracket. Compared with the movable roller being directly mounted on the second bracket, the solution provided in this embodiment can make the position adjustment of the movable roller easier to operate.

[0015] In some embodiments, the compaction 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. The solution provided in this embodiment further improves the degree of automation of the compaction mechanism, making the width adjustment of the first gap more convenient and accurate.

[0016] In some embodiments, the compacting mechanism further comprises a fixing structure, which is used to fix the position of the movable roller after it is moved into position. By adopting the solution provided in this embodiment, the movable roller can be fixed in relative position with the second bracket and the fixedly mounted roller after it is moved into position, so that the compacting mechanism processing operation can be carried out stably.

[0017] 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, and a third gap is provided between the first support portion and the second movable bracket; the second support 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 support portion respectively. The fixed structure adopts the structure provided in this embodiment, which is simple in structure and easy to prepare and install.

[0018] 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 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. The solution provided by this embodiment is adopted to facilitate the installation of the second support portion, which can improve production efficiency to a certain extent.

[0019] In some embodiments, the side of the second mobile bracket opposite to the first support part is a horizontally arranged plane, and the side of the first support part opposite to the second mobile bracket is an inclined surface; the side of the second support part used for contacting the second mobile bracket is a horizontally arranged plane, and the side used for contacting the first support part is an inclined surface. By adopting the solution provided in this embodiment, the second support part can achieve surface contact with the first support part and the second mobile bracket respectively, so that the friction between the second support part and the second mobile bracket and the first support part after installation can be relatively large, and thus the second mobile bracket can be stably supported.

[0020] In some embodiments, the second support portion is a wedge-shaped block. The solution provided in this embodiment makes the second support portion simple and stable in structure, and is easy to prepare and operate.

[0021] In some embodiments, the compacting mechanism further includes an adjusting component, the adjusting component is mounted on the second bracket, and the driving end of the adjusting component is connected to the second supporting part, and is used to drive the second supporting part to be inserted into the third gap. The setting of the adjusting component facilitates the insertion of the second supporting part into the third gap, which can improve the processing efficiency of the first material to a certain extent.

[0022] 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 against the second support portion. The adjustment assembly adopts the structure provided by this embodiment, which is simple in structure and easy to operate.

[0023] In some embodiments, 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. With the solution provided in this embodiment, the structures of the first adjusting portion and the second adjusting portion are both relatively simple, and are easy to install and operate.

[0024] In the second aspect, an embodiment of the present application provides a battery production system, including a convexity device provided by any of the above embodiments. The battery production system provided by the embodiment of the present application adds a set of convexity mechanisms and compaction mechanisms in front of the winding equipment, so that the thickness of different areas of the first material after passing through the convexity device is equivalent, which can reduce the risk of defective products such as misalignment of the tabs to a certain extent, thereby improving the consistency of different electrode assemblies and the winding excellence of the electrode assemblies to a certain extent. At the same time, the battery production system provided by the embodiment of the present application is highly compatible with the thickness of the incoming pole pieces, so that pole pieces of different thicknesses can be mixed and matched, and the manpower and plant area required for the grading of pole pieces can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0025] On the third aspect, the embodiment of the present application provides a winding method, including: providing a pole piece and a diaphragm; processing by a convex forming device provided by any of the above embodiments; winding and forming. Through the winding method provided by the embodiment of the present application, the thickness of different regions of the first material can be obtained to be equivalent, which can reduce the risk of defective products such as misalignment of the pole ear 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 thickness of the pole piece material is highly compatible, so that pole pieces of different thicknesses can be mixed and matched, and the manpower and plant area required for the matching of pole pieces can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0026] 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

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0028] Figure 1 This is a schematic diagram of the use state of the convexity-making device in some embodiments of the present application;

[0029] Figure 2 Schematic diagram of the use state of the convexity-making device in other embodiments of the present application;

[0030] Figure 3 for Figure 2 A schematic diagram of the structure of the first material;

[0031] Figure 4 This is a schematic diagram of the main structure of the convexity-making mechanism of some embodiments of the present application;

[0032] Figure 5 A schematic diagram of the three-dimensional structure of a convexity-making mechanism in some embodiments of the present application;

[0033] Figure 6 This is a schematic diagram of the main structure of the compacting mechanism of some embodiments of the present application;

[0034] Figure 7 A schematic diagram of the three-dimensional structure of a compacting mechanism in some embodiments of the present application;

[0035] Figure 8 It is a schematic diagram of the side structure of the compacting mechanism of some embodiments of the present application, in which the second supporting part is not shown;

[0036] Fig. 9 This is a schematic flow chart of a winding method according to some embodiments of the present application.

[0037] The reference numerals in the specific implementation manner are as follows:

[0038] 100, convex forming mechanism; 110, first roller body; 120, second roller body; 130, first gap; 140, convex portion; 150, elastic layer; 160, first bracket; 170, first movable bracket; 180, first linear drive mechanism;

[0039] 200, compacting mechanism; 210, third roller body; 220, fourth roller body; 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;

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

[0041] 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

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

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may 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, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] 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).

[0048] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0051] The electrode assembly is an important component of the battery. According to the preparation method of the electrode assembly, it can be divided into a wound electrode assembly and a laminated electrode assembly. Among them, the wound electrode assembly is widely used because it is relatively simple to operate and easy to control the quality.

[0052] The 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, all positive pole ears should be aligned, and all negative pole ears should be aligned, but in actual production, especially in batch production, the thickness of each electrode sheet often cannot be kept completely consistent, and the thickness of the same electrode sheet sometimes also has uneven conditions. This will cause the position of the pole ears to be misaligned after the electrode sheet and the separator are wound, resulting in defective products.

[0053] 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, and changes the convex process of directly making preset convex points 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 through 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, so that the thickness of the first material reaches the preset value, so that even if the thickness of the first material before the convex device is uneven, the thickness of different areas of the first material after the convex device can be made to be equal, which can reduce the risk of defective products such as ear misalignment to a certain extent, thereby improving the consistency of different electrode assemblies and the winding rate of 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 sheet, so that electrodes of different thicknesses can be mixed and matched, and the manpower and plant area required for the matching of electrode sheets can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0054] The convex device disclosed in the embodiment of the present application can be used in a winding device, a winding production line or a winding method. The winding device generally includes a convex device. In addition, the winding device may also include a winding needle located downstream of the convex device, or other equipment. Among them, the convex device is used to make convex points on the positive electrode sheet, the negative electrode sheet or the combination of the electrode sheet and the diaphragm to make the thickness of the electrode sheet uniform, and the winding needle is used to wind the electrode sheet and the diaphragm into shape.

[0055] The winding production line generally includes the above-mentioned winding equipment. In addition, the winding production line may also include a feeding mechanism or other equipment located upstream of the convex forming device. The feeding mechanism may include a first diaphragm feeding mechanism, a first pole piece feeding mechanism and a second diaphragm feeding mechanism. The above-mentioned upstream of the convex forming device means that in the production process, the relevant materials (such as the first diaphragm, the first pole piece and the second diaphragm) will first pass through the feeding mechanism and then pass through the convex forming device.

[0056] Please refer to Figures 1 to 3 , a convexity device provided in an embodiment of the present application. The convexity device includes a convexity mechanism 100 and a compaction mechanism 200 sequentially arranged along the conveying direction X of the first material 300. The convexity mechanism 100 is used to prepare an overpressure convex point 310 on the first material 300. The height h of the overpressure convex point 310 is greater than the height of the preset convex point, and the preset convex point is the convex point required by the first material 300. The compaction mechanism 200 is used to apply pressure to the overpressure convex point 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.

[0057] The convexity-making 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 convexity-making device for the preparation of electrode assemblies as an example to illustrate its use principle.

[0058] The first material 300 can be a single electrode, such as a positive electrode or a negative electrode; it can also be a combination of any electrode and a separator, such as a stacked positive electrode and a separator, or a stacked negative electrode and a separator; it can also be a stacked positive electrode, a separator and a negative electrode; it can also be a stacked negative electrode, a separator, a positive electrode and a separator. The specific method can be determined according to the needs of use. Among them, both the positive electrode and the negative electrode have pole ears, such as Figure 3 As shown. It is understandable that Figure 3 The first material 300 shown is in an unprocessed state. After the first material 300 is processed, there will be convex spots on the entire first surface 320 .

[0059] 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 will first pass through the convex forming mechanism 100 and then pass through the compacting mechanism 200 .

[0060] 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 protrusion, or it can include two rollers, at least one of which is provided with a protrusion, or other forms can be used as long as the overpressure convex point 310 can be prepared on the first material 300.

[0061] It is understandable that the overvoltage bump 310 is generally a hemispherical bump structure, and may also be a block-shaped bump structure, or a bump structure of other shapes, which may be determined according to the manufacturing process.

[0062] The height h of the overpressure convex point 310 refers to the size of the overpressure convex point 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 convex point refers to the size of the preset convex point 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 above-mentioned first surface refers to the surface of the first material 300 on which the overpressure convex point 310 is convexly provided. The preset convex point refers to the convex point that should be manufactured after the first material 300 passes through the entire convex making device according to the processing requirements. It can be understood that the height h of the overpressure convex point 310 and the height of the preset convex point can be a fixed value or a range value respectively according to the use requirements. When either the height h of the overpressure convex point 310 and the height of the preset convex point is a range value, the height h of the overpressure convex point 310 is greater than the height of the preset convex point of the convex point required by the first material 300, which means that the minimum value of the height h of the overpressure convex point 310 is greater than the maximum value of the height of the preset convex point.

[0063] 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. It can also be in other forms, as long as it can apply pressure to the overpressure convex point 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 convex point and the side of the first surface of the first material 300 away from the highest point of the convex point along the normal direction N of the first surface 320 of the first material 300. The convex point mentioned here refers to the convex point formed after the overpressure convex point 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 convex making device according to the processing requirements. It can be understood that the above preset value can be a fixed value or a range value, which can be determined according to the specific use needs.

[0064] 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 .

[0065] The process of using the convexity-making device provided in the embodiment of the present application is as follows:

[0066] The first material 300 is firstly passed through the station where the convex forming mechanism 100 is located in a flat state, and the convex forming mechanism 100 forms convexities on the first material 300 to obtain overpressure convex points 310. At this time, the thickness a of the first material 300 is greater than the preset value. Then, the first material 300 with the overpressure convex points 310 is transported to the station where the compacting mechanism 200 is located, and the compacting mechanism 200 applies pressure to the overpressure convex points 310 toward the first surface 320 of the first material 300, so that the height of the convex points on the first material 300 is reduced until the thickness a of the first material 300 is consistent with the preset value or within the preset value range.

[0067] The convexity forming device provided in the embodiment of the present application is provided with a convexity forming mechanism 100 and a compacting mechanism 200 which are sequentially arranged along the conveying direction X of the first material 300, which changes the convexity forming process of directly forming a preset convex point by the convexity forming mechanism 100 in the related art, and instead forms an overpressure convex point 310 having a height greater than the height of the preset convex point on the first material 300 through two steps, and then applies pressure 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 convexity forming device is uneven, the thickness of different areas of the first material after passing through the convexity forming 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 convexing device provided in the embodiment of the present application is highly compatible with the thickness of the incoming pole piece material, so that pole pieces of different thicknesses can be mixed and matched, and the manpower and factory area required for the grading and matching of the pole pieces can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

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

[0069] One or more first roller bodies 110 can be provided as needed, and one or more second roller bodies 120 can also be provided as needed.

[0070] The first gap 130 is a 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 may be equal to the thickness a of the first material 300, or may be slightly smaller than the thickness a of the first material 300.

[0071] 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.

[0072] 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.

[0073] like Figure 4 and Figure 5 As shown, in some embodiments, one of the first roller body 110 and the second roller body 120 is provided with a protrusion 140 , and the surface of the other roller body is provided with an elastic layer 150 for contacting the first material 300 .

[0074] The solution provided in this embodiment includes two situations: in the first situation, a protrusion 140 is provided on the first roller body 110, and an elastic layer 150 for contacting the first material 300 is provided on the surface of the second roller body 120; in the second situation, a protrusion 140 is provided on the second roller body 120, and an elastic layer 150 for contacting the first material 300 is provided on the surface of the first roller body 110.

[0075] 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 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 needs of use.

[0076] 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.

[0077] 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.

[0078] 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 elasticity, such as rubber, nylon, etc.

[0079] 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.

[0080] like Figure 4 and Figure 5 As shown, in some embodiments, 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 a first direction Y1. The first direction Y1 is perpendicular to the axial direction of the fixedly mounted roller.

[0081] The first bracket 160 can be made of one component or a combination of multiple components according to the use requirements. The specific configuration can be determined according to the use requirements.

[0082] 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, which includes the following 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).

[0083] The above-mentioned fixed installation on the first bracket 160 means that after the corresponding roller body 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.

[0084] By adopting the solution provided in this embodiment, the width of the first gap 130 can be adjusted. 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 embossing mechanism 100 can be applied to the embossing process of the first material 300 with different thicknesses, which can expand the application range of the embossing mechanism 100 to a certain extent.

[0085] In some embodiments, 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. The movable roller is fixedly mounted on the first movable bracket 170.

[0086] The first movable bracket 170 can be made of one component or a combination of multiple components according to the use requirements. The specific configuration can be determined according to the use requirements.

[0087] The movable roller body is fixedly installed on the first movable bracket 170, which means that the above-mentioned roller body 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 body 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.

[0088] 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.

[0089] 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.

[0090] The first linear drive mechanism 180 in this embodiment may be a pneumatic cylinder, a hydraulic cylinder, or other linear drive mechanisms, and may be composed of one component or multiple components, depending on the specific usage requirements.

[0091] When in use, the first linear drive mechanism 180 can be controlled to work so as to control the first movable bracket 170 to move relative to the first bracket 160 , thereby achieving adjustment of the width of the first gap 130 between the first roller body 110 and the second roller body 120 .

[0092] By adopting the solution provided in this embodiment, the degree of automation of the convexification mechanism 100 is further improved, making the width adjustment of the first gap 130 more convenient and accurate.

[0093] In some embodiments, the first linear drive mechanism 180 includes a pneumatic cylinder, a hydraulic cylinder, and / or a servo motor linear drive.

[0094] The solutions provided in this embodiment include but are not limited to the following situations: First, the first linear drive mechanism 180 only includes a cylinder, wherein the number of cylinders can be one or more; second, the first linear drive mechanism 180 only includes a hydraulic cylinder, wherein the number of hydraulic cylinders can be one or more; third, the first linear drive mechanism 180 includes both a cylinder and a hydraulic cylinder, wherein the number of cylinders and the number of hydraulic cylinders can be one or more respectively; fourth, the first linear drive mechanism 180 only includes a servo motor linear drive, wherein the number of servo motor linear drives can be one or more; fifth, the first linear drive mechanism 180 includes both a cylinder and a servo motor linear drive, wherein the number of cylinders and the number of servo motor linear drives can 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 hydraulic cylinders and the number of servo motor linear drives can be one or more respectively; seventh, the first linear drive mechanism 180 includes a cylinder, a hydraulic cylinder and a servo motor linear drive, wherein the number of cylinders, hydraulic cylinders and servo motor linear drives can be one or more respectively.

[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 compacting mechanism 200 includes a third roller body 210 and a fourth roller body 220 spaced apart from each other. A second gap 230 is provided between the third roller body 210 and the fourth roller body 220 for passing the 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 compacting mechanism 200.

[0097] One or more third roller bodies 210 can be provided as required, and one or more fourth roller bodies 220 can also be provided as required.

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

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

[0100] 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 the second direction Y2. The second direction Y2 is perpendicular to the axis direction of the fixedly mounted roller.

[0101] The second bracket 240 can be made of one component or a combination of multiple components according to the use requirements. The specific method can be determined according to the use requirements.

[0102] One of the third roller body 210 and the fourth roller body 220 is fixedly mounted on the second bracket 240, and the other roller body is movably mounted on the second bracket 240 along the second direction Y2, which includes the following two situations: first, the third roller body 210 is fixedly mounted on the second bracket 240, and the fourth roller body 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 body 210); second, the fourth roller body 220 is fixedly mounted on the second bracket 240, and the third roller body 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 body 220).

[0103] The above-mentioned fixed installation on the second bracket 240 means that after the corresponding roller body 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.

[0104] By adopting the solution provided in this embodiment, the width b of the second gap 230 can be adjusted, so that the compacting mechanism 200 can be applied to the processing needs of the first material 300 of different thicknesses, and the applicable scope of the compacting mechanism 200 can be expanded to a certain extent.

[0105] 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.

[0106] The second movable bracket 250 can be made of one component or a combination of multiple components according to the use requirements. The specific configuration can be determined according to the use requirements.

[0107] The movable roller body is fixedly installed on the second movable bracket 250, which means that the above-mentioned roller body 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 body 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 along the direction perpendicular to its own axis.

[0108] 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.

[0109] 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.

[0110] The second linear drive mechanism 260 in this embodiment may be a cylinder, a hydraulic cylinder, or other linear drive mechanisms, and may be composed of one component or multiple components, depending on the specific usage requirements.

[0111] When in use, the second linear drive mechanism 260 can be controlled to work to control the second movable bracket 250 to move relative to the second bracket 240 , thereby achieving width adjustment of the first gap 130 between the third roller body 210 and the fourth roller body 220 .

[0112] By adopting the solution provided in this embodiment, the degree of automation of the compacting mechanism 200 is further improved, making the width adjustment of the first gap 130 more convenient and accurate.

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

[0114] The solutions provided in this embodiment include but are not limited to the following situations: First, the second linear drive mechanism 260 only includes a cylinder, wherein the number of cylinders can be one or more; second, the second linear drive mechanism 260 only includes a hydraulic cylinder, wherein the number of hydraulic cylinders can be one or more; third, the second linear drive mechanism 260 includes both a cylinder and a hydraulic cylinder, wherein the number of cylinders and the number of hydraulic cylinders can be one or more respectively; fourth, the second linear drive mechanism 260 only includes a servo motor linear drive, wherein the number of servo motor linear drives can be one or more; fifth, the second linear drive mechanism 260 includes both a cylinder and a servo motor linear drive, wherein the number of cylinders and the number of servo motor linear drives 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 hydraulic cylinders and the number of servo motor linear drives can be one or more respectively; seventh, the second linear drive mechanism 260 includes a cylinder, a hydraulic cylinder and a servo motor linear drive, wherein the number of cylinders, hydraulic cylinders and servo motor linear drives can be one or more respectively.

[0115] The second linear drive mechanism 260 adopts the solution provided in this embodiment, which has a simple structure and is easy to install.

[0116] like Figure 7 As shown, 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 the movable roller is moved into position.

[0117] The fixing structure 270 can be arranged in a variety of ways, such as including a bolt threadedly connected to the second bracket 240, or a fixing block magnetically mounted on the second bracket 240. Other structures and arrangements can also be adopted as long as the fixing structure 270 can fix the position of the movable roller after it is moved into place.

[0118] 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, so that the processing operation of the compacting mechanism 200 can be carried out stably.

[0119] like Figure 7 and Figure 8 As shown, 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, and a third gap 273 is provided between the first support portion 271 and the second movable bracket 250.

[0120] The second support portion 272 is used to be installed in the third gap 273 after the movable roller body moves to a position, and abuts against the second movable bracket 250 and the first support portion 271 respectively.

[0121] 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 arranged component, which may be determined according to usage requirements.

[0122] The second support portion 272 may be composed of one component or multiple components, and may be movably mounted on the first support portion 271 or may be an independently arranged component, which may be determined specifically according to the use requirements. The shape and size of the second support portion 272 may 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 is different from the corresponding parameter of the third gap 273, the second support portion 272 can only fill part of the space of the third gap 273 after being installed in the third gap 273. In either case, as long as the second support portion 272 is installed in the third gap 273, it can support the second mobile bracket 250 to cooperate with the second linear drive mechanism 260 to limit the position of the second mobile bracket 250.

[0123] The fixing structure 270 adopts the structure provided in this embodiment, which has a simple structure and is easy to prepare and install.

[0124] In some embodiments, Figure 8 As shown, 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.

[0125] The second support portion 272 is used 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. The cross-sectional area of ​​the second support portion 272 refers to the cross-sectional area obtained by cutting the second support portion 272 with a plane perpendicular to the third direction.

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

[0127] In some embodiments, the side of the second mobile bracket 250 opposite to the first support portion 271 is a horizontally arranged plane. The side of the first support portion 271 opposite to the second mobile bracket 250 is an inclined surface. The side of the second support portion 272 used for contacting the second mobile bracket 250 is a horizontally arranged plane, and the side used for contacting the first support portion 271 is an inclined surface.

[0128] 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, non-90 degree angle with the horizontally arranged plane.

[0129] 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 relatively large after installation, thereby achieving stable support for the second movable bracket 250.

[0130] In some embodiments, the second support portion 272 is a wedge-shaped block. The solution provided in this embodiment makes the second support portion 272 simple and stable in structure, and is easy to prepare and operate.

[0131] In some embodiments, Figure 7 As shown, the compacting mechanism 200 further includes an adjusting assembly 280. The adjusting assembly 280 is mounted on the second bracket 240. The driving end of the adjusting assembly 280 is connected to the second supporting portion 272, and is used to drive the second supporting portion 272 to be inserted into the third gap 273.

[0132] The adjustment component 280 can be composed of a single body or multiple parts, depending on the specific usage requirements. For example, the adjustment component 280 can be a sliding part slidably set on the second bracket 240, a threaded part threadedly connected to the second bracket 240, etc., as long as the adjustment component 280 can push the second support portion 272 to be inserted into the third gap 273.

[0133] 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.

[0134] In some embodiments, Figure 7 As shown, 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 the second adjustment portion 282 abuts against the second support portion 272.

[0135] 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 arranged component, which may be determined according to usage requirements.

[0136] 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.

[0137] 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, the second adjustment part 282 can be rotated to push 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.

[0138] The adjustment component 280 adopts the structure provided in this embodiment, which is simple in structure and easy to operate.

[0139] In some embodiments, the first adjusting portion 281 includes a protrusion protruding from the second bracket 240. A threaded hole is provided on the protrusion. The second adjusting portion 282 includes a bolt threadedly connected to the threaded hole.

[0140] The convex portion in this 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, etc., which can be determined according to usage requirements.

[0141] By adopting the solution provided in this embodiment, the structures of the first adjustment part 281 and the second adjustment part 282 are relatively simple, and are easy to install and operate.

[0142] According to some embodiments of the present application, the present application also provides a battery production system, comprising a convexity-making device according to any of the above schemes.

[0143] 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 equivalent, which can reduce the risk of defective products such as misalignment of the pole ear to a certain extent, thereby improving the consistency of the different electrode assemblies obtained and the winding excellence 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 pole pieces, so that pole pieces of different thicknesses can be mixed and matched, and the manpower and plant area required for the matching of pole pieces can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0144] According to some embodiments of the present application, the present application also provides a winding method. Fig. 9 As shown, the winding method includes:

[0145] S1. Provide pole pieces and diaphragms;

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

[0147] S3, winding forming.

[0148] 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 equivalent, which can reduce the risk of defective products such as misalignment of the tabs 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 of the electrodes can be eliminated or reduced to a certain extent, thereby improving the winding efficiency to a certain extent.

[0149] According to some embodiments of the present application, a convexity device is provided. Figures 1 to 8 As shown, the convex forming device includes a convex forming mechanism 100 and a compacting mechanism 200 which are sequentially arranged along the conveying direction X of the first material 300. The convex forming mechanism 100 is used to prepare overpressure convex points 310 on the first material 300. The height h of the overpressure convex points 310 is greater than the height of the preset convex points. The preset convex points are the convex points required for the first material 300. The compacting mechanism 200 is used to apply pressure to the overpressure convex points 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.

[0150] The convex forming mechanism 100 includes a first roller body 110 and a second roller body 120 spaced apart from each other, a first gap 130 for passing the first material 300 is provided between the first roller body 110 and the second roller body 120, and a protrusion 140 is provided on at least one of the first roller body 110 and the second roller body 120. In some embodiments, one of the first roller body 110 and the second roller body 120 is provided with a protrusion 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, both the first roller body 110 and the second roller body 120 are provided with a protrusion 140, and the protrusions 140 on the first roller body 110 and the second roller body 120 are staggered.

[0151] 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.

[0152] The convexification mechanism 100 further includes a first linear drive mechanism 180, which 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. The first linear drive mechanism 180 includes a cylinder, a hydraulic cylinder and / or a servo motor linear drive, etc.

[0153] 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 convexifying mechanism 100.

[0154] 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 .

[0155] 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 .

[0156] The compaction mechanism 200 further includes a second linear drive mechanism 260, which 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. The second linear drive mechanism 260 includes a cylinder, a hydraulic cylinder and / or a servo motor linear drive, etc.

[0157] The compaction mechanism 200 further includes a fixing structure 270, which is used to fix the position of the movable roller after the movable roller moves 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 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, and a third gap 273 is formed between the first support portion 271 and the second movable bracket 250. The second support portion 272 is used to be installed in the third gap 273 after the movable roller moves into position, and abuts against the second movable bracket 250 and the first support portion 271, respectively.

[0158] 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 second support portion 272 is used 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 movable bracket 250 opposite to the first support part 271 is a plane, and the side of the first support part 271 opposite to the second movable bracket 250 is an inclined surface. The side of the second support part 272 used for contacting the second movable bracket 250 is a plane, and the side used for contacting the first support part 271 is an inclined surface. The second support part 272 is a wedge-shaped block.

[0160] 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 .

[0161] 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 the second adjustment portion 282 abuts against the second support portion 272. The first adjustment portion 281 includes a convex portion protruding from the second bracket 240, the convex portion is provided with a threaded hole, and the second adjustment portion 282 includes a bolt threadedly connected to the threaded hole.

[0162] The roller material 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 metal, rubber, nylon, non-metal or the like.

[0163] The convexing device provided in this embodiment is not only applicable to cathode pole pieces 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 overpressure 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 overpressure convex points back into the first material to form 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 misalignment of the pole ears.

[0164] The convex forming device provided in this embodiment is highly compatible with the thickness of the incoming electrode sheet, and a electrode sheet with a stable thickness can be formed after passing through the mechanism.

[0165] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be 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 convexification 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.

Images