Extension assembly, pole piece forming equipment and battery production equipment

Abstract

The utility model relates to an extension assembly, pole piece forming equipment and battery production equipment, and belongs to the technical field of battery production equipment. The extension assembly is used for extending at least part of the pole piece on a conveying path of the pole piece, the extension assembly comprises a first roller and a second roller, and the first roller is provided with a concave area arranged in a surrounding mode in the circumferential direction; and the second roller is at least partially arranged in the concave area so as to be matched with the first roller to roll and extend the pole piece penetrating between the first roller and the second roller. According to the extension assembly, the pole piece forming equipment and the battery production equipment provided by the invention, the possibility of belt breakage during pole piece extension is reduced, and the pole piece forming reliability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to an extension component, a pole piece forming device and a battery production device. Background Art

[0002] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptops, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc. Cold pressing the pole piece is an essential process in the battery production process and is also a key process directly affecting the battery output power and cycle life. Through the cold pressing process, the overall structure of the electrode pole piece can be made more compact, thereby improving the battery output power and cycle life, and also reducing the safety risk of the battery using the pole piece. In the cold pressing process, it is necessary to ensure that the pole piece has a certain flatness so that the pole piece is evenly pressed.

[0003] However, in the cold pressing process, the pole piece to be processed is usually a pole piece coated with slurry. This pole piece usually has an uncoated blank area reserved as a pole ear and a coated area covered by the slurry. Due to the differences in parameters such as thickness and structural strength between the blank area and the coated area, the ductility of the two areas is different during cold pressing, which easily leads to problems such as uneven stress or pole piece wrinkling.

[0004] In the cold pressing process, how to improve the flatness of the pole piece and reduce the possibility of belt breakage is an important research direction in the battery field. Summary of the Utility Model

[0005] In view of the above problems, the present application provides an extension component, a pole piece forming device and a battery production device, which can reduce the risk of belt breakage during the extension of the pole piece and have higher reliability.

[0006] In a first aspect, an embodiment of the present application provides an extension component. The extension component is used to extend at least a part of the pole piece on the conveying path of the pole piece. The extension component includes a first roller and a second roller. The first roller is provided with a recessed area circumferentially arranged along the circumference; at least a part of the second roller is arranged in the recessed area to cooperate with the first roller to roll and extend the pole piece passing between the first roller and the second roller.

[0007] In the technical solution of the embodiment of the present application, by providing a recessed area circumferentially arranged along the circumference on the first roller and arranging at least a part of the second roller in the recessed area to cooperate with the first roller to roll and extend the pole piece passing between the first roller and the second roller, such a design method enables the pole piece to roll and extend under the cooperation between the part of the first roller arranged in the recessed area and the recessed area, reducing the need to apply tension to the pole piece, and further reducing the risk of belt breakage of the pole piece under the action of tension.

[0008] In some embodiments, the first roller and the second roller are arranged along a preset direction, and the preset direction intersects the axial direction of the first roller; in the preset direction, the position of at least one of the first roller and the second roller is adjustable. Such a design can adjust the degree of extension of the pole piece by adjusting the position of the first roller or the second roller in the preset direction, and the operation is simple and conducive to industrialization.

[0009] In some embodiments, along the axial direction of the first roller, the orthographic projection of the second roller and the orthographic projection of the first roller have an overlapping area; the extension assembly further includes a measuring member configured to show the size of the overlapping area in the preset direction. By providing that the extension assembly includes a measuring member configured to show the size of the overlapping area in the preset direction, since the size of the overlapping area in the preset direction shows the size of the second roller extending into the recessed area and is proportional to the degree of extension of the pole piece, the measuring member can be used to quantify the degree of extension of the pole piece, which is beneficial to accurately controlling the degree of extension of the pole piece.

[0010] In some embodiments, the extension assembly further includes a support frame, and the first roller and the second roller are respectively arranged on the support frame; the support frame includes a main body portion and an adjusting portion provided on the main body portion. The first roller is rotatably connected to the main body portion, and the adjusting portion is rotatably connected to the second roller and is used to adjust the position of the second roller along the preset direction. By providing an adjusting portion on the support frame, the position of the second roller in the preset direction can be flexibly adjusted by the telescoping of the adjusting portion.

[0011] In some embodiments, the extension assembly includes a plurality of second rollers, the support frame includes a plurality of adjusting portions, and the second rollers and the adjusting portions are arranged in one-to-one correspondence. Such a design can independently adjust the positions of different second rollers through a plurality of adjusting portions, increasing the overall applicability of the extension assembly.

[0012] In some embodiments, along the axial direction of the first roller, the positions of at least some of the adjusting portions are adjustable. Furthermore, by adjusting the positions of the adjusting portions in the axial direction of the first roller, the extension assembly can freely adjust the distance between adjacent second rollers in the axial direction of the first roller according to the size of the pole piece to adapt to pole pieces of different specifications, further increasing the applicability of the extension assembly.

[0013] In some embodiments, the extension assembly further includes a heating member for heating the second roller. By heating the pole piece through the second roller, the extension of the pole piece can be assisted.

[0014] In some embodiments, the heating member includes a resistance wire. By heating the second roller through the resistance wire, the heating response speed is fast and the structure is stable, thereby further improving the extension efficiency of the pole piece.

[0015] In some embodiments, the first roller includes a roller body portion and a plurality of sleeves. Each sleeve is connected to the roller body portion and sleeved on the roller body portion along the axial direction of the roller body portion. The plurality of sleeves are sequentially arranged at intervals along the axial direction of the roller body portion, and adjacent sleeves cooperate with the roller body portion to form a recessed area. Such a design method enables the roller body portion and the sleeves to be separately formed, and the recessed area on the first roller is formed by an assembly method, which is beneficial to reducing the forming difficulty of the recessed area and improving the production efficiency of the first roller.

[0016] In some embodiments, along the axial direction of the first roller, the positions of at least some of the sleeves are adjustable. By adjusting the positions of the sleeves along the axial direction of the first roller, the size of the recessed area along the axial direction of the first roller is further adjusted, so as to adjust the size of the recessed area along the axial direction of the first roller according to different sizes of the pole pieces, and further improve the applicability of the stretching assembly.

[0017] In some embodiments, the sleeve includes at least two cylindrical body portions that are sequentially matched along the axial direction of the first roller, and at least one cylindrical body portion can be adjusted in position along the axial direction of the first roller. Such a design method enables the size of the sleeve in the axial direction of the first roller to be adjustable, and thus the sleeve can be adjusted according to the size of the pole piece, so as to better support the pole piece during pole piece stretching.

[0018] In some embodiments, each cylindrical body portion includes an annular end portion and a clamping portion provided on the end portion. For the clamping portions of adjacent two end portions, one of them is a clamping groove extending along the axial direction of the first roller, and the other is a clamping protrusion that is adjusted along the axial direction of the first roller in the clamping groove. Such a setting method has a simple structure and is easy to process and install.

[0019] In some embodiments, the clamping portion includes a plurality of clamping calipers, and the plurality of clamping calipers are arranged at intervals along the circumferential direction of the end portion to form gaps between adjacent clamping calipers. The clamping calipers are configured as clamping protrusions, and the gaps are configured as clamping grooves. With such a design method, between two mutually cooperating clamping portions, the clamping calipers of one can extend into the gaps of the other along the axial direction of the first roller, improving the structural consistency of each cylindrical body portion, reducing the die design difficulty and quantity during production, and further improving the production and assembly efficiency of the stretching assembly.

[0020] In some embodiments, the stretching assembly further includes a third roller disposed opposite to the first roller, and at least a part of the third roller is disposed in the recessed area; the third roller and the second roller are arranged in a circumferential dislocation along the first roller, and the third roller and the second roller are at least partially dislocated along the axial direction of the first roller. Such a design can simultaneously use the third roller and the second roller to cooperate with the same recessed area of the first roller for rolling stretching, further improving the applicability of the stretching assembly to the size of the pole piece.

[0021] In some embodiments, the number of the third rollers is the same as that of the second rollers, and one third roller is correspondingly arranged with one second roller, so as to meet the stretching requirements of most pole piece sizes while simplifying the structure of the stretching assembly, and improve the installation efficiency of the stretching assembly.

[0022] In some embodiments, the concave area includes a first area and a second area that communicate with each other along a direction intersecting the axial direction of the first roller. The first area is closer to the axis of the first roller than the second area, and the dimension of the second area in the axial direction of the first roller is larger than that of the first area in the axial direction of the first roller. In this way, during the structural design stage of the second roller, the second roller can be set to a more prominent shape in the middle to further improve the stretching efficiency of the pole piece.

[0023] In some embodiments, a blank area of the pole piece is used to pass through between the second roller and the concave area of the first roller, wherein the pole piece includes a blank area without a coated active material layer. Such a design can utilize the stretching assembly to stretch the blank area of the pole piece, so that the stretching rate of the blank area of the pole piece after the cold pressing process is closer to that of the coated area coated with the active material layer, thereby improving the flatness of the pole piece after cold pressing.

[0024] In a second aspect, the present application also provides a pole piece forming device, which includes a conveying assembly, a rolling assembly, and a stretching assembly provided in any of the foregoing embodiments; wherein, the conveying assembly is used to convey the pole piece; the rolling assembly is arranged on the conveying path of the pole piece and is used to roll the pole piece.

[0025] In a third aspect, the present application also provides a battery production device, which includes the pole piece forming device provided in any of the foregoing embodiments.

[0026] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic three-dimensional structure diagram of a stretching assembly provided in an embodiment of the present application;

[0029] Figure 2 For Figure 1 the enlarged view of part A of the extension component shown;

[0030] Figure 3 the schematic structural diagram of the sleeve in a state in the extension component provided by an embodiment of the present application;

[0031] Figure 4 the schematic structural diagram of the sleeve in another state in the extension component provided by an embodiment of the present application;

[0032] Figure 5 the side view of the extension component provided by an embodiment of the present application;

[0033] Figure 6 the schematic structural diagram of the cooperation of the first roller, the second roller and the third roller in the extension component provided by an embodiment of the present application;

[0034] Figure 7 the front view of the cooperation structure of the first roller and the second roller in the extension component provided by an embodiment of the present application.

[0035] Description of reference numerals: 100, extension component; 10, first roller; 11, roller body part; 12, sleeve; 121, cylinder part; 1211, end part; 1212, clamping part; 20, second roller; 30, measuring part; 40, support frame; 41, main body part; 42, adjusting part; 50, heating part; 60, third roller;

[0036] 101, recessed area; 1011, first area; 1012, second area; 102, caliper; 103, gap; X, preset direction. Detailed implementation manners

[0037] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0039] In addition, if there is a term "and / or", "and / or" is merely a correlative relationship describing related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the related objects before and after are in an "or" relationship. If there are terms such as "first" and "second", these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "coupled", "fixed", etc., these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, etc., its meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0042] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0043] In the cold pressing process of processing the electrode assembly, it is necessary to ensure that the electrode sheet has a certain flatness so that the electrode sheet is evenly pressed. However, the electrode sheets to be processed usually have uncoated blank areas and coated areas covered with slurry. Due to differences in parameters such as thickness and structural strength between the blank area and the coated area, the ductility of the two areas is different during cold pressing, which easily leads to problems such as uneven stress or wrinkling of the electrode sheet.

[0044] In view of the foregoing technical problems, the embodiments of the present application provide a technical solution that can improve the accuracy and stability of stretching, and at the same time can effectively reduce the possibility of tape breakage during the stretching process. It can be understood that the following embodiments of the present application only take the application of the stretching assembly to the processing of electrode sheets as an example for illustration, but the stretching assembly provided by the embodiments of the present application is not limited to the following embodiments, and can also be applied to other occasions where stretching and extending of some areas in a sheet-like structure are required, and protect them.

[0045] Next, in combination with the attached Figure 1 to the attached Figure 7 the structure of the stretching assembly will be described.

[0046] Please refer to the attached Figure 1 and the attached Figure 2 , Figure 1 is a three-dimensional structural schematic diagram of a stretching assembly provided by an embodiment of the present application; Figure 2 is Figure 1 an enlarged view of part A of the stretching assembly shown.

[0047] The embodiments of the present application provide a stretching assembly 100. The stretching assembly 100 is used to stretch at least part of the electrode sheet on the conveying path of the electrode sheet. The stretching assembly 100 includes a first roller 10 and a second roller 20. The first roller 10 is provided with a recessed area 101 circumferentially arranged; at least part of the second roller 20 is arranged in the recessed area 101 to cooperate with the first roller 10 to roll and stretch the electrode sheet passing between the first roller 10 and the second roller 20.

[0048] The function of the stretching component 100 is to improve the stretching uniformity of the electrode sheet after the cold pressing process, making the electrode sheet flatter after cold pressing. Among them, the stretching component 100 is used to stretch at least part of the electrode sheet on the conveying path of the electrode sheet, which means that the stretching component 100 is designed to stretch the part of the electrode sheet where the active material is not coated.

[0049] In some embodiments, the stretching component 100 can be used to stretch the foil without coated active material as a whole, that is, when the electrode sheet only includes the foil; or, in some embodiments, the stretching component 100 can also be used to stretch the electrode sheet coated with the active material. At this time, the stretching component 100 is designed to stretch the area of the electrode sheet where the active material is not coated.

[0050] In these embodiments of the present application, the first roller 10 is provided with a recessed area 101 circumferentially arranged. At least part of the second roller 20 is arranged in the recessed area 101 to cooperate with the first roller 10 to roll and stretch the electrode sheet passing between the first roller 10 and the second roller 20. At least one of the first roller 10 and the second roller 20 can rotate actively to cooperate with the other to roll and squeeze the passing electrode sheet together, causing the electrode sheet to deform, extend, and stretch.

[0051] The axes of the first roller 10 and the second roller 20 can extend in the same direction, and their diameters can also be selected as needed. Exemplarily, in these embodiments of the present application, the diameter of the first roller 10 can be set to be not less than the diameter of the second roller 20.

[0052] In some embodiments, when the stretching component 100 stretches the electrode sheet, the tangential rotation speeds of the first roller 10 and the second roller 20 can be controlled to be synchronized with the moving speed of the electrode sheet, so that the stretching effects at each position of the electrode sheet in the conveying direction are consistent, improving the stretching uniformity of the electrode sheet, and reducing the probability of the electrode sheet being scratched during the stretching process.

[0053] At least part of the second roller 20 is arranged in the recessed area 101, so that after the electrode sheet is conveyed to the position of the stretching component 100 and passes through the first roller 10 and the second roller 20, under the blocking and rolling action of the first roller 10, the electrode sheet is continuously pressed into the recessed area 101, so that the extension trajectory of the electrode sheet changes from extending along a plane to extending along the outer contour of the first roller 10, and then the extension trajectory of the part of the electrode sheet corresponding to the first roller 10 becomes longer, thereby enabling the electrode sheet to be extended and stretched.

[0054] According to the extension component 100 provided by the embodiments of the present application, by providing a circumferentially surrounding recessed area 101 on the first roller 10 and arranging at least a part of the second roller 20 within the recessed area 101, it is used to cooperate with the first roller 10 to roll and extend the pole piece passing between the first roller 10 and the second roller 20. Such a design method enables the pole piece to roll and extend under the cooperation between the part of the first roller 10 arranged within the recessed area 101 and the recessed area 101, reducing the need to apply tension to the pole piece, and further reducing the risk of the pole piece breaking under the action of tension.

[0055] In some embodiments, the first roller 10 and the second roller 20 are arranged along a preset direction X, and the preset direction X intersects the axial direction of the first roller 10; in the preset direction X, the position of at least one of the first roller 10 and the second roller 20 is adjustable.

[0056] The axial directions of both the first roller 10 and the second roller 20 are parallel and can be arranged in sequence along the preset direction X. In some embodiments, the number of the second rollers 20 can be set to be multiple, and in the preset direction X, the multiple second rollers 20 can be respectively located on the same side of the first roller 10.

[0057] Along the preset direction X, the distance between the first roller 10 and the second roller 20 can be set to be adjustable. Exemplarily, at least one of the first roller 10 and the second roller 20 can be set to be movable in the preset direction X to adjust the depth of the second roller 20 pressing into the recessed area 101 in the preset direction X, and further adjust the extension rate of the pole piece.

[0058] In these embodiments of the present application, the first roller 10 and the second roller 20 can be set to move in this direction by means of providing a plurality of connection holes arranged along the preset direction X on the support structure, providing a slide rail extending along the preset direction X, providing a support structure that can be telescoped, etc., as long as the parallelism of the central axes of the first roller 10 and the second roller 20 can be maintained.

[0059] Exemplarily, in some embodiments, the second roller 20 can be set to be position-adjustable in the preset direction X, and further adjust the relative positional relationship between the second roller 20 and the recessed area 101. When the distance dimension between the second roller 20 and the first roller 10 in the preset direction X is small, more parts of the second roller 20 can be arranged within the recessed area 101, and thus more deformation occurs when the pole piece passes through, improving the extension rate of the pole piece; while when the distance dimension between the second roller 20 and the first roller 10 in the preset direction X is large, fewer parts of the second roller are arranged within the recessed area 101, and thus less deformation occurs when the pole piece passes through, reducing the extension rate of the pole piece.

[0060] In some embodiments, along the axial direction of the first roller 10, the orthographic projection of the second roller 20 and the orthographic projection of the first roller 10 have an overlapping area; the extension assembly 100 further includes a measuring member 30, and the measuring member 30 is configured to show the dimension of the overlapping area in the preset direction X.

[0061] The measuring member 30 is configured to show the dimension of the overlapping area in the preset direction X. A possible implementation is to set the measuring member 30 as a scale ruler. When the positions of the first roller 10 and / or the second roller 20 change in the preset direction X, the changed dimensions can be synchronously recorded by the scale ruler; alternatively, the measuring member 30 can also be set as a distance sensor, and the distance sensor can move along with the first roller 10 and / or the second roller 20 in the preset direction X, and then measure the displacement of the first roller 10 and / or the second roller 20 in the preset direction X to determine the dimension of the overlapping area in the preset direction X.

[0062] In these embodiments of the present application, by using the measuring member 30 to show the dimension of the overlapping area in the preset direction X, after the pole piece passes between the first roller 10 and the second roller 20, the extension amount of the compressed area in the pole piece is positively correlated with the dimension of the overlapping area in the preset direction X. Therefore, the extension rate of the pole piece can be accurately quantified by measuring the parameters of the two rollers and the dimension of the overlapping area in the preset direction X, which is beneficial to accurately controlling the degree of extension of the pole piece.

[0063] In some embodiments, the extension assembly 100 further includes a support frame 40, and the first roller 10 and the second roller 20 are respectively arranged on the support frame 40; the support frame 40 includes a main body portion 41 and an adjusting portion 42 arranged on the main body portion 41. The first roller 10 is rotatably connected to the main body portion 41, and the adjusting portion 42 is rotatably connected to the second roller 20 and is used to adjust the position of the second roller 20 along the preset direction X.

[0064] The extension assembly 100 may include a support frame 40 as a main body support structure and used to define the relative positions of the first roller 10 and the second roller 20. The support frame 40 may include a main body portion 41 for realizing support and an adjusting portion 42 for realizing movement in the preset direction X, and the adjusting portion 42 is installed on the main body portion 41.

[0065] The second roller 20 can be rotatably connected to one end of the adjusting part 42 away from the main body part 41, and the position of the second roller 20 can be adjusted by changing the extending dimension of the adjusting part 42 in the preset direction X. The first roller 10 is rotatably connected to the main body part 41. Thus, the position of the first roller 10 in the preset direction X can be fixed, or the rotation axis of the first roller 10 can be made to move along the preset direction X. Exemplarily, a slide rail extending along the preset direction X can be provided on the main body part 41, and both ends of the rotation axis of the first roller 10 can be inserted into the slide rail so that the first roller 10 can slide along the slide rail.

[0066] In these embodiments of the present application, the adjusting part 42 can be set in the structural forms such as a telescopic rod, a threaded lead screw, an electric cylinder, etc. Further, the adjusting part 42 can adopt the structural form of a servo electric cylinder in which a servo motor and a lead screw are integrally arranged. The servo electric cylinder has high control precision, low cost, and flexible configuration, and can accurately control the amount of the second roller 20 disposed in the concave area 101.

[0067] In some embodiments, the main body part 41 can be set in a shape of the letter "U", and the bent sections on both sides extend along the preset direction X. The section located in the middle can be used to install the adjusting part 42, and the adjusting part 42 extends into the groove formed by the enclosure of the U-shaped structure. The first roller 10 can be rotatably connected between the bent sections on both sides. Thus, the distance between the first roller 10 and the second roller 20 in the preset direction X can be adjusted by the expansion and contraction of the adjusting part 42.

[0068] In some embodiments, the extension assembly 100 includes a plurality of second rollers 20, and the support frame 40 includes a plurality of adjusting parts 42. The second rollers 20 and the adjusting parts 42 are arranged in one-to-one correspondence.

[0069] The support frame 40 can be selected to have a plurality of adjusting parts 42 respectively installed on the main body part 41, wherein the adjusting parts 42 can be arranged in sequence along the axial direction of the second roller 20 and are arranged in one-to-one correspondence with the second roller 20. The dimensions of the respective adjusting parts 42 in the preset direction X can be selected to be adjusted independently of each other.

[0070] In some embodiments of the present application, each second roller 20 can also be selected with different size parameters according to different parameters of the polar plate to be extended. By arranging the second rollers 20 in one-to-one correspondence with a plurality of adjusting parts 42, the position adjustment of the second rollers 20 can be made more flexible, thereby improving the overall applicability of the extension assembly 100.

[0071] In some embodiments, the position of at least part of the adjusting portion 42 is adjustable along the axial direction of the first roller 10. A possible implementation is that the adjusting portion 42 and the main body portion 41 can be detachably or movably connected, so that at least part of the adjusting portion 42 can be adjusted in position along the axial direction of the first roller 10. In this way, the stretching assembly 100 can adjust the position of the adjusting portion 42 in the axial direction of the first roller 10 according to the parameter dimensions of the pole piece, further improving the flexibility of the position adjustment of the adjusting portion 42 and further enhancing the overall applicability of the stretching assembly 100.

[0072] In some embodiments, the positions of all the adjusting portions 42 in the axial direction of the first roller 10 can be set to be adjustable, so as to select and determine the number of the adjusting portions 42 and the positions of the respective adjusting portions 42 in the axial direction of the first roller 10 according to the size of the pole piece to be stretched; at the same time, when it is necessary to replace the pole piece for production on the production line, the number of the adjusting portions 42 and the positions of the respective adjusting portions 42 in the axial direction of the first roller 10 can also be adjusted again to adapt to the pole piece with new size parameters.

[0073] In some embodiments, the stretching assembly 100 further includes a heating member 50, and the heating member 50 is used to heat the second roller 20.

[0074] A heating member 50 can also be provided in the stretching assembly 100. The heating member 50 can be connected to the second roller 20 to heat the second roller 20, and then heat the pole piece to be stretched through the second roller 20, so as to improve the stretching performance of the foil in the pole piece to be stretched and reduce the probability of breakage of the pole piece during stretching.

[0075] In these embodiments of the present application, the temperature of the second roller 20 can be controlled by the heating member 50 to be between 100°C and 120°C, so as to reduce the influence on the adhesion of the coating material on the foil while improving the stretching performance of the foil in the pole piece to be stretched.

[0076] In these embodiments of the present application, the heating member 50 can be arranged on the side of the second roller 20 facing away from the first roller 10 to reduce the influence on the cooperation between the second roller 20 and the first roller 10 for stretching the pole piece.

[0077] In some embodiments, the heating member 50 includes a resistance wire. That is to say, the heating member 50 can be selected to heat the second roller 20 by means of resistance wire heating. The heating member 50 is designed in the structure of a heating rod. By arranging a resistance wire inside the heating rod, a temperature measuring sensor can also be matched for closed-loop control to improve the accuracy and reliability of heating the second roller 20 by the heating member 50.

[0078] In some embodiments of the present application, the heating element 50 may also be configured in the form of a magnetic induction coil, which converts electrical energy into heat energy. Such a configuration can reduce the connection between the heating element 50 and the second roller 20, thereby reducing the influence of the heating element 50 on the rotation of the second roller 20.

[0079] In some embodiments, the first roller 10 includes a roller body portion 11 and a plurality of sleeves 12. Each sleeve 12 is connected to the roller body portion 11 and axially sleeved on the roller body portion 11; the plurality of sleeves 12 are sequentially arranged at intervals along the axial direction of the roller body portion 11, and the adjacent sleeves 12 and the roller body portion 11 cooperate to form a recessed area 101.

[0080] The first roller 10 including the roller body portion 11 and the plurality of sleeves 12 means that the first roller 10 can be configured to be composed of the roller body portion 11 and the sleeves 12 sleeved on the roller body portion 11, so as to reduce the forming difficulty of the recessed area 101 during the production stage of the first roller 10. Instead, a plurality of sleeves 12 arranged at intervals along the axial direction are provided on the roller body portion 11, and the roller body portion 11 and the adjacent sleeves 12 jointly form the recessed area 101.

[0081] In this way, during the forming stage of the first roller 10, the roller body portion 11 and the sleeves 12 can be separately formed and assembled to form the recessed area 101, which reduces the forming difficulty of the recessed area 101 and provides the possibility for adjusting the size of the recessed area 101.

[0082] The sleeve 12 is sleeved on the roller body portion 11 and connected to the roller body portion 11. A possible implementation manner is that the sleeve 12 can be detachably connected to the roller body portion 11 by means of threaded connection, connection with a connecting member (screw, bolt), etc., so that during the operation of the extension assembly 100, the positions of the sleeves 12 in the axial direction of the roller body portion 11 can be adjusted according to the size of the polar tab to be extended, thereby adjusting the size of the recessed area 101 and increasing the applicability of the first roller 10; in some embodiments, it can also be set that the sleeve 12 and the roller body portion 11 are connected by welding or even integrally formed to improve the structural consistency between the sleeve 12 and the roller body portion 11 and have higher reliability.

[0083] The plurality of sleeves 12 are sequentially arranged at intervals along the axial direction of the roller body portion 11, and the adjacent sleeves 12 and the roller body portion 11 cooperate to form the recessed area 101, which means that since the sleeve 12 is a member sleeved on the roller body portion 11, there is a thickness difference between the part where the sleeve 12 is provided and the part where the sleeve 12 is not provided in the radial direction of the first roller 10. In this way, the adjacent sleeves 12 and the roller body portion 11 jointly form the recessed area 101, wherein the outer wall surface of the roller body portion 11 is the bottom wall surface of the recessed area 101, and the mutually adjacent surfaces of the adjacent sleeves 12 are the side wall surfaces of the recessed area 101.

[0084] In some embodiments, the position of at least a part of the sleeve 12 is adjustable along the axial direction of the first roller 10.

[0085] In these embodiments of the present application, at least a part of the sleeve 12 is detachably connected to the first roller 10. In this way, by adjusting the position of the sleeve 12 along the axial direction of the first roller 10, the size of the recessed area 101 along the axial direction of the first roller 10 can be adjusted, and thus the size of the recessed area 101 along the axial direction of the first roller 10 can be adjusted according to different sizes of the pole pieces, further improving the applicability of the stretching assembly 100.

[0086] In these embodiments of the present application, the size of the recessed area 101 in the axial direction of the first roller 10 can be adjusted according to the size of the part to be stretched in the pole piece in the axial direction of the first roller 10, so that the recessed area 101 matches the size of the pole piece, and then when the subsequent stretching process is carried out, the part to be stretched in the pole piece can be better stretched.

[0087] Please refer to Figures 1 to 4 , wherein Figure 3 is a schematic structural diagram of the sleeve in a state of the stretching assembly provided by an embodiment of the present application; Figure 4 is a schematic structural diagram of the sleeve in another state of the stretching assembly provided by an embodiment of the present application.

[0088] In some embodiments, the sleeve 12 includes at least two cylinder parts 121 that are sequentially fitted along the axial direction of the first roller 10, and at least one cylinder part 121 can be adjusted in position along the axial direction of the first roller 10. The sleeve 12 includes at least two cylinder parts 121, and each cylinder part 121 is sequentially fitted along the axial direction of the first roller 10, which means that the sleeve 12 is at least formed by the cooperation of two cylinder parts 121. Exemplarily, in some embodiments, it can be set that the sleeve 12 includes two cylinder parts 121, the two cylinder parts 121 are sequentially arranged in the axial direction of the first roller 10, and the adjacent ends of the two cylinder parts 121 are fitted to jointly form a sleeve 12; in some embodiments, it can also be set that the sleeve 12 includes three, four or five cylinder parts 121, and each cylinder part 121 is respectively fitted with the adjacent cylinder part 121 in the axial direction of the first roller 10 to jointly form a sleeve 12.

[0089] At least one cylindrical body portion 121 can be adjusted in position along the axial direction of the first roller 10. That is to say, the size of the sleeve 12 in the axial direction of the first roller 10 is adjustable to provide better support for the electrode sheet to be extended. In these embodiments of the present application, it can be set that a detachable connection method is adopted between the two cylindrical body portions 121 at both ends of the single sleeve 12 in the axial direction of the first roller 10 and the roller body portion 11. Furthermore, the size of the sleeve 12 can be adjusted by adjusting the position of the cylindrical body portion 121 in the axial direction of the first roller 10.

[0090] In some embodiments, each cylindrical body portion 121 includes an annular end portion 1211 and a clamping portion 1212 provided on the end portion 1211. The clamping portions 1212 of two adjacent end portions 1211, one of which is a slot extending along the axial direction of the first roller 10, and the other is a clamping protrusion that can be adjusted along the axial direction of the first roller 10 in the slot.

[0091] The end portion 1211 is the part where the cylindrical body portion 121 is connected to the roller body portion 11. In these embodiments of the present application, the end portion 1211 is set to be annular so that the cylindrical body portion 121 can be sleeved outside the roller body portion 11 along the axial direction of the roller body portion 11.

[0092] The clamping portion 1212 is the part where adjacent cylindrical body portions 121 cooperate with each other. Among them, the clamping portion 1212 is provided on the end portion 1211, which means that the clamping portion 1212 is provided at one or both ends of the end portion 1211 along the axial direction of the first roller 10 to cooperate with the clamping portion 1212 of the adjacent cylindrical body portion 121, thereby maintaining the relative position relationship between two adjacent cylindrical body portions 121.

[0093] For the clamping portions 1212 of two adjacent end portions 1211, one of which is a slot extending along the axial direction of the first roller 10, and the other is a clamping protrusion that can be adjusted along the axial direction of the first roller 10 in the slot. During the installation stage of the first roller 10, the clamping portions 1212 of two adjacent cylindrical body portions 121 can be assembled, so that the clamping protrusion of one of them is inserted into the slot of the clamping portion 1212 of the adjacent cylindrical body portion 121 along the axial direction of the first roller 10. In this way, the installation of the cylindrical body portion 121 on the roller body portion 11 is realized, and finally a plurality of sleeves 12 are arranged at intervals along the axial direction of the first roller 10.

[0094] In some embodiments, the clamping portion 1212 includes a plurality of clamping cards 102. The plurality of clamping cards 102 are arranged at intervals along the circumferential direction of the end portion, so as to form a gap 103 between adjacent clamping cards 102. The clamping cards 102 are configured as clamping protrusions, and the gap is configured as a slot.

[0095] The clamping portion 1212 is provided with a plurality of calipers 102 extending along the axial direction of the first roller 10, and the plurality of calipers 102 are arranged at intervals around the circumference of the first roller 10. In this way, in each cylindrical body portion 121, the plurality of calipers 102 can be regarded as the clamping protrusions in the clamping portion 1212, and the gap 103 between two adjacent calipers 102 along the circumferential direction of the first roller 10 can be regarded as the clamping groove in the clamping portion 1212.

[0096] Based on this, in the assembly stage of the first roller 10, after rotating and adjusting the position of the adjacent cylindrical body portions 121 along the circumferential direction of the first roller 10, the caliper 102 of one cylindrical body portion 121 can be inserted axially into the gap 103 between the adjacent calipers 102 of another cylindrical body portion 121 along the axial direction of the first roller 10, so that the adjacent cylindrical body portions 121 are in a structure of clamping groove and clamping protrusion with each other, which can further improve the matching effect between the adjacent cylindrical body portions 121.

[0097] Please refer to Figures 1 to 7 , in which, Figure 5 is a side view of the extension assembly provided by an embodiment of the present application; Figure 6 is a schematic diagram of the cooperation structure of the first roller, the second roller and the third roller in the extension assembly provided by an embodiment of the present application; Figure 7 is a front view of the cooperation structure of the first roller and the second roller in the extension assembly provided by an embodiment of the present application.

[0098] In some embodiments, the extension assembly 100 further includes a third roller 60 disposed opposite to the first roller 10, and at least a part of the third roller 60 is disposed in the recessed area 101; the third roller 60 and the second roller 20 are arranged in a circumferential dislocation along the first roller 10, and the third roller 60 and the second roller 20 are at least partially axially dislocated along the first roller 10.

[0099] The structure and arrangement mode of the third roller 60 can be the same as those of the second roller 20 to cooperate with the second roller 20 to jointly extend the pole piece.

[0100] The third roller 60 and the second roller 20 are arranged in a circumferential dislocation along the first roller 10, aiming to reduce the probability of mutual influence between the third roller 60 and the second roller 20.

[0101] Exemplarily, in some embodiments, the size of the blank area of the pole piece that needs to be extended by the extension component 100 in the axial direction of the first roller 10 is 30 mm, while the axial size of the second roller 20 is 20 mm. At this time, setting a single second roller 20 alone cannot meet the dimensional requirements for the extension of the pole piece, and if two second rollers 20 are set to extend together, it will exceed the dimensional requirements for the extension of the pole piece. At the same time, if there are differences in the axial dimensions of different second rollers 20, it will undoubtedly increase the pressure on the second roller production line.

[0102] In this way, by setting the third roller 60 that is circumferentially misaligned with the second roller 20 along the first roller 10, and setting the third roller 60 to be at least partially misaligned with the second roller 20 along the axial direction of the first roller 10, it is possible to meet the requirements for different extension dimensions of the blank area of the pole piece without the need to produce second rollers 20 (third rollers 60) of different sizes. At this time, only by controlling that there is an overlapping part of 10 mm between the third roller 60 and the second roller 20 along the axial direction of the first roller 10, the third roller 60 and the second roller 20 can be used together with the first roller 10 to extend the pole piece with a size of 30 mm in the axial direction of the first roller 10 for the blank area.

[0103] In these embodiments of the present application, by setting the third roller 60, the applicability of the extension component 100 to the size of the pole piece can be further increased, and it can be quickly switched to the production line for different pole piece sizes, and the switching operation is simple and efficient.

[0104] In some embodiments, the number of the third rollers 60 is the same as that of the second rollers 20, and one third roller 60 is correspondingly arranged with one second roller 20.

[0105] In these embodiments of the present application, the axial dimensions of the second roller 20 and the third roller 60 can be set to be both 20 mm, so as to be compatible with the pole pieces with a size of 20 mm to 40 mm in the axial direction of the first roller 10 for the blank area; in some embodiments, it can also but is not limited to setting the axial dimensions of the second roller 20 and the third roller 60 to be 10 mm, 15 mm, 30 mm, etc.

[0106] In some embodiments, the concave area 101 includes a first area 1011 and a second area 1012 that are connected in a direction intersecting the axial direction of the first roller 10. The first area 1011 is relatively closer to the axis of the first roller 10 than the second area 1012, and the size of the second area 1012 in the axial direction of the first roller 10 is greater than the size of the first area 1011 in the axial direction of the first roller 10.

[0107] The first region 1011 communicates with the second region 1012 in a direction intersecting the axial direction of the first roller 10, which means that the first region 1011 and the second region 1012 are different regions of the first roller 10 in the radial direction. Among them, the first region 1011 is closer to the axis of the first roller 10 than the second region 1012.

[0108] The dimension of the second region 1012 in the axial direction of the first roller 10 is greater than the dimension of the first region 1011 in the axial direction of the first roller 10. That is, along the radially outward direction of the first roller 10, the dimension of the concave region 101 in the axial direction of the first roller 10 changes, so that the concave region 101 forms a structure that is deeper in the middle and shallower at both ends. In this way, by designing the second roller 20, the second roller 20 can also be designed to be a more convex structure (in the axial direction of the first roller 10) to further strengthen the stretching effect of the second roller 20 on the pole piece.

[0109] At the same time, in these embodiments of the present application, the first roller 10 can be rounded at the connection between the first region 1011 and the second region 1012 and at the connection between the second region 1012 and the outside, so as to reduce the probability of the second roller 20 scratching the pole piece when cooperating with the first roller 10 to stretch the pole piece, and further improve the reliability of the stretching assembly 100.

[0110] In some embodiments, a blank area for the pole piece is provided between the second roller 20 and the concave region 101 of the first roller 10, where the pole piece includes a blank area without a coated active material layer. Such a design can utilize the stretching assembly to stretch the blank area of the pole piece, so that the stretching rate of the blank area of the pole piece after the cold pressing process is closer to the stretching rate of the coated area coated with the active material layer, thereby improving the flatness of the pole piece after cold pressing.

[0111] In a second aspect, the present application further provides a pole piece forming device, which includes a conveying assembly, a rolling assembly, and a stretching assembly 100 provided in any of the foregoing embodiments; wherein, the conveying assembly is used for conveying the pole piece; the rolling assembly is arranged on the conveying path of the pole piece and is used for rolling the pole piece.

[0112] Among them, it can be set that the conveying assembly includes a pole piece unwinding roller, a pole piece winding roller, and a plurality of driving rollers. Optionally, the rotation speeds of the unwinding roller and the winding roller can be synchronized with the tangential rotation speeds of the first roller 10 and the second roller 20, so that the pole piece can be uniformly stretched. The rolling assembly can include more than two pressing rollers, and the stretching assembly 100 can be arranged upstream or downstream of the rolling assembly, and can be selected according to specific process requirements.

[0113] The blank areas of the electrode sheets in the stretching assembly 100 can be arranged in one-to-one correspondence with the second roller 20 in the conveying direction. In this embodiment, the absolute value of the difference between the extension dimension of the second roller 20 in its own axial direction and the extension dimension of the corresponding blank area in this direction can be less than or equal to 1 mm, that is, the dimensions of the two are the same or similar, so as to reduce the possibility of damaging the coating area while fully stretching the blank area.

[0114] In a third aspect, the present application also provides a battery production device, which includes the electrode sheet forming device provided in any of the foregoing embodiments.

[0115] According to some embodiments of the present application, please refer to Figures 1 to 7 , the present application provides a stretching assembly 100, which includes a first roller 10, a second roller 20, a metering member 30, a heating member 50 and a third roller 60. The first roller 10 is provided with a concave area 101 arranged circumferentially; the second roller 20 and the third roller 60 are at least partially arranged in the concave area 101 for cooperatively rolling and stretching the electrode sheet passing between the first roller 10 and the second roller 20, and between the first roller 10 and the third roller 60.

[0116] Among them, the metering member 30 is configured to show the dimension of the overlapping area in the preset direction X to quantify the stretching degree of the cooperation between the second roller 20 and the first roller 10, which is beneficial to accurately control the stretching degree of the electrode sheet.

[0117] The heating member 50 is used to heat the second roller 20, and then heat the electrode sheet to be stretched through the second roller 20 to improve the tensile properties of the foil in the electrode sheet to be stretched and reduce the probability of breakage of the electrode sheet during the stretching process.

[0118] The third roller 60 and the second roller 20 are arranged circumferentially offset along the first roller 10, and the third roller 60 and the second roller 20 are at least partially axially offset along the first roller 10, so as to use the third roller 60 and the second roller 20 to cooperate with the first roller 10 to stretch the electrode sheet in a larger size range, improving the stretching applicability of the stretching assembly 100 to the size of the electrode sheet.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An extension component for extending at least a part of a pole piece on a conveying path of the pole piece, characterized in that , The extension component includes: A first roller, provided with a recessed area circumferentially arranged; A second roller, at least partially arranged in the recessed area, for cooperating with the first roller to roll and extend the pole piece passing between the first roller and the second roller.

2. The extended component according to claim 1, wherein The first roller and the second roller are arranged along a preset direction, and the preset direction intersects with the axial direction of the first roller; In the preset direction, the position of at least one of the first roller and the second roller is adjustable.

3. The extension component according to claim 2, wherein Along the axial direction of the first roller, the orthographic projection of the second roller and the orthographic projection of the first roller have an overlapping area; The extension component further includes a measuring member, which is configured to show the size of the overlapping area in the preset direction.

4. The extension component according to claim 2, characterized in that The extension component further includes a support frame, and the first roller and the second roller are respectively arranged on the support frame; The support frame includes a main body portion and an adjustment portion arranged on the main body portion. The first roller is rotatably connected to the main body portion, and the adjustment portion is rotatably connected to the second roller and is used to adjust the position of the second roller along the preset direction.

5. The extension component according to claim 4, wherein The extension component includes a plurality of the second rollers, the support frame includes a plurality of adjustment portions, and the second rollers are arranged in one-to-one correspondence with the adjustment portions.

6. The extension component according to claim 5, characterized in that, Along the axial direction of the first roller, the position of at least part of the adjustment portions is adjustable.

7. The extension component according to claim 1, wherein The extension component further includes a heating member, which is used to heat the second roller.

8. The extension assembly according to claim 7, wherein The heating member includes a resistance wire.

9. The extension component according to claim 1, wherein The first roller includes a roller body portion and a plurality of sleeves. Each sleeve is connected to the roller body portion and is sleeved on the roller body portion along the axial direction of the roller body portion; The plurality of sleeves are sequentially arranged at intervals along the axial direction of the roller body portion, and the adjacent sleeves cooperate with the roller body portion to form the recessed area.

10. The extension component according to claim 9, characterized in that, Along the axial direction of the first roller, the position of at least part of the sleeves is adjustable.

11. The extension component according to claim 9, wherein, The sleeve includes at least two cylindrical body portions that are sequentially matched along the axial direction of the first roller, and at least one of the cylindrical body portions can be adjusted in position along the axial direction of the first roller.

12. The extension component according to claim 11, wherein Each of the cylindrical body portions includes an annular end portion and a clamping portion arranged on the end portion. The clamping portions of the adjacent two end portions, one of them is a clamping groove extending along the axial direction of the first roller, and the other is a clamping protrusion that is adjusted along the axial direction of the first roller in the clamping groove.

13. The extension component according to claim 12, characterized in that, The clamping portion includes a plurality of clamping calipers, and the plurality of clamping calipers are arranged at intervals along the circumferential direction of the end portion to form a gap between the adjacent clamping calipers. The clamping caliper is configured as the clamping protrusion, and the gap is configured as the clamping groove.

14. The extension assembly according to any one of claims 1 to 13, characterized in that, The extension component further includes a third roller arranged opposite to the first roller, and at least part of the third roller is arranged in the recessed area; The third roller and the second roller are arranged in a circumferential dislocation along the first roller, and the third roller and the second roller are at least partially dislocated along the axial direction of the first roller.

15. The extension component according to claim 14, wherein The number of the third rollers is the same as that of the second rollers, and one third roller is arranged corresponding to one second roller.

16. The extended component according to claim 1, characterized in that, The concave area includes a first area and a second area that communicate with each other along a direction intersecting the axial direction of the first roller. The first area is closer to the axis of the first roller than the second area, and the dimension of the second area in the axial direction of the first roller is greater than the dimension of the first area in the axial direction of the first roller.

17. The stretching assembly according to claim 1, wherein A blank area of the pole piece is adapted to pass between the second roller and the concave area of the first roller, wherein the pole piece includes a blank area where the active material layer is not coated.

18. A pole piece forming device, characterized in that, Comprising: A conveying assembly for conveying the pole piece; A rolling assembly disposed on the conveying path of the pole piece and for rolling the pole piece; And The stretching assembly according to any one of claims 1 to 17.

19. A battery production device, characterized in that, Comprising the pole piece forming device according to claim 18.

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