Electrode assembly flattening apparatus

Abstract

An electrode assembly flattening apparatus (1), comprising a flattening component (11), a connecting member (12) and a dust hood (13). The flattening component (11) comprises a plurality of flattening heads (111) arranged at intervals, and a first end face (121) of the connecting member (12) is connected to the flattening component (11) and is configured to drive the flattening component (11) to rotate. The dust hood (13) comprises a body (134) and a plurality of tubes (135) connected to the body (134). The plurality of tubes (135) are arranged at intervals around a central axis (L); each tube (135) among the plurality of tubes (135) has an opening on the side thereof facing the central axis (L), and the openings are in communication with each other; a suction inlet (133) is defined on the side of the plurality of tubes (135) facing away from the body (134); and at least part of each flattening head (111) is accommodated between two adjacent tubes (135).

Description

Electrode assembly flattening device

[0001] Cross-reference to related applications

[0002] This application refers to Chinese Patent Application No. 202421506275.8 entitled “Electrode assembly flattening device” filed on June 28, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, and in particular, to an electrode assembly flattening device. BACKGROUND

[0004] In the preparation process of the battery cell, the tab on the electrode assembly is flattened, which can reduce the space ratio of the tab, thereby improving the energy density of the battery cell, and at the same time, can also make the end face of the electrode assembly relatively flat, so as to facilitate the welding between the tab and the current collector.

[0005] In the process of flattening the tab, some debris will be generated due to friction, and the debris entering the inside of the electrode assembly will affect the performance and quality of the battery cell. Therefore, how to reduce the debris entering the inside of the electrode assembly is a key problem to improve the performance and quality of the battery cell.

[0006] SUMMARY

[0007] The present application aims to at least solve one of the technical problems existing in the background art. To this end, one object of the present application is to provide an electrode assembly flattening device to improve or alleviate the problems in the related art.

[0008] The embodiment of the first aspect of the application provides an electrode assembly rubbing device, which comprises a rubbing component, a connecting piece and a dust removal cover. The rubbing component comprises a plurality of rubbing heads arranged at intervals, which are used for rubbing the end face of the electrode assembly. The connecting piece has a first end face, a second end face and an air extraction channel communicated with the first end face and the second end face, which are arranged opposite along the axial direction of the connecting piece. The first end face of the connecting piece is connected with the rubbing component and is used for driving the rubbing component to rotate. The dust removal cover has a third end face and a fourth end face arranged opposite along the axial direction of the connecting piece and internally communicated. The third end face is formed with a suction inlet. The fourth end face is connected with the first end face and the air extraction channel. The dust removal cover has a central axis. A plurality of pipe bodies are arranged at intervals around the central axis. Each pipe body among the plurality of pipe bodies has an opening towards one side of the central axis. The openings are communicated with each other. The side of the plurality of pipe bodies away from the body defines the suction inlet. Any one of the plurality of rubbing heads is at least partially accommodated between adjacent two pipe bodies. The dust removal cover obtained by connecting the pipe body and the body in two parts can reduce the processing amount of the special-shaped structure, reduce the processing cost, and the shape and size are relatively regular. The suction inlet can be as close as possible to the end face and cover the end face as much as possible. The reliability and comprehensiveness of the debris suction are improved. Accordingly, the probability of the debris falling into the electrode assembly is reduced, and the performance and quality of the battery monomer are improved.

[0009] In some embodiments, a gap is arranged on the side of the adjacent two pipe bodies away from the body. The rubbing part of the rubbing head is at least partially accommodated in the gap. By arranging the gap to accommodate the rubbing part, the overall structure is more compact, and the end of the pipe body away from the body can be further close to the end face of the electrode assembly.

[0010] In some embodiments, the gap is located on the side of the rubbing head away from the end face of the electrode assembly. The relatively recessed gap can accommodate the rubbing part of the corresponding rubbing head. The space between the adjacent two pipe bodies can accommodate the extrusion part of the corresponding rubbing head. The relatively protruding pipe body can extend into the gap between the adjacent two rubbing heads, so that the suction inlet can be as close as possible to the end face of the electrode assembly, thereby effectively and reliably sucking the debris generated on the end face.

[0011] In some embodiments, the gap is formed on the connecting part between the adjacent two pipe bodies by cutting. That is, the gap is processed by cutting. After the openings of the adjacent two pipe bodies are welded, the gap is cut on the connecting part.

[0012] In some embodiments, the normal projection of the body and the rubbing part of the rubbing head on a projection plane at least partially overlaps. The pipe body and the rubbing part do not overlap. The projection plane is a plane perpendicular to the central axis. The rubbing part is fully avoided while the relatively protruding pipe body can extend into the gap between the adjacent two rubbing heads without interference, so that the suction inlet can be as close as possible to the end face of the electrode assembly.

[0013] In some embodiments, the axes of the plurality of pipe bodies are parallel to each other and parallel to the central axis. By arranging the axes of the pipe bodies and the central axis in parallel, the channels in the pipe bodies are straight channels, which facilitates the smooth flow of air in the pipe bodies and improves the efficiency of the dust suction.

[0014] In some embodiments, the cross-sectional area of each of the plurality of pipe bodies at each position in the direction of the axis of the pipe body is the same. By selecting pipe bodies with the same size at each position, it is convenient to obtain materials and process, and thus to obtain the dust cover by welding.

[0015] In some embodiments, one end of the body has an arc-shaped end face, one end of the plurality of pipe bodies is welded to the arc-shaped end face, and the plurality of pipe bodies are in communication with the body. By arranging the end face connecting the body and the pipe body into an arc-shaped end face, the contact area between the pipe body and the body is increased, the reliability of the welding between the pipe body and the body is improved, and at the same time, the arc-shaped end face also facilitates the flow of air in the body, thereby improving the effect of dust suction.

[0016] In some embodiments, one end of each of the plurality of pipe bodies has an arc surface matched with the arc-shaped end face, and the arc surface is welded to the arc-shaped end face; the arc-shaped end face is provided with a plurality of through holes corresponding to the plurality of pipe bodies one by one, and the through holes are in communication with the corresponding pipe bodies. By arranging the arc surface matched with the arc-shaped end face at one end of the pipe body, the reliability of the welding between the pipe body and the body is improved, and at the same time, the pipe body is in communication with the body through the through hole.

[0017] In some embodiments, the rotation axis of the flattening component coincides with the central axis of the dust cover. By arranging the rotation axis of the flattening component to coincide with the central axis of the dust cover, the central axis of the dust cover coincides with the center of the end face, so that the suction inlet can cover the center of the end face, so that the dust in the center of the end face can be fully sucked, and the effect of dust suction is improved.

[0018] In some embodiments, the electrode assembly flattening device further comprises an air suction fan in communication with the air suction channel. By arranging the air suction fan as a power source for dust suction, the air suction fan, the air suction channel and the dust cover are sequentially communicated, and under the condition that the air suction fan is turned on, a negative pressure can be generated at the suction inlet, so as to suck the dust on the end face of the electrode assembly, thereby reducing the probability of the dust falling into the interior of the electrode assembly.

[0019] In some embodiments, the flattening head comprises a flattening part and a pressing part connected to the flattening part. By directly rolling and flattening the end face of the electrode assembly through the flattening part, and by limiting and pressing the edge of the end face of the electrode assembly through the pressing part, the tab can be flattened as much as possible towards the center of the end face, reducing the eversion of the tab.

[0020] In some embodiments, the flattening part is configured as a conical flattening part, and the outer surface of the flattening part is configured to contact the end surface of the electrode assembly. By configuring the flattening part as a conical shape, the end surface of the electrode assembly is directly rolled and flattened by the side surface of the flattening part.

[0021] In some embodiments, the extruding part is configured as a cylindrical extruding part, and the connecting part of the extruding part is configured to contact the edge of the end surface of the electrode assembly. Thus, the edge is limited and extruded, so that the tab can be flattened as much as possible towards the center of the end surface, reducing the tab eversion.

[0022] In some embodiments, the electrode assembly flattening device further comprises a mounting seat, the mounting seat is detachably connected with the connecting piece, and the flattening head is rotationally connected with the mounting seat. By rotationally connecting the flattening head with the mounting seat, the flattening head can adaptively roll on the end surface of the electrode assembly when the connecting piece rotates, reducing the friction during flattening.

[0023] In some embodiments, the outer surface of the tube body has a flat surface parallel to the central axis, i.e., the tube body can be configured as a flat tube.

[0024] In some embodiments, the connecting piece is configured as a flange, and the rotation axis of the flange coincides with the central axis, so that the dust cover is driven by the flange to rotate around the same axis.

[0025] In some embodiments, the number of flattening heads is three, and the three flattening heads are uniformly arranged around the central axis. The uniform arrangement of the three flattening heads improves the stability during flattening.

[0026] In some embodiments, the number of tube bodies is three, and the three tube bodies are uniformly arranged around the central axis. The three tube bodies are matched with the three flattening heads to achieve sufficient suction.

[0027] Embodiments of the second aspect of the application provide a battery production system comprising the electrode assembly flattening device as described in the above embodiments.

[0028] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application, the above description 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 application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0029] In the drawings, like reference numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, the emphasis instead being placed upon illustrating the principles of the application. It should be understood that the drawings are merely intended to depict some embodiments of the application. Other embodiments can be derived from the drawings, by utilizing their teachings in conjunction with the appended claims.

[0030] Fig. 1 is a structural schematic diagram of an electrode assembly kneading device according to some embodiments of the present application;

[0031] Fig. 2 is a structural schematic diagram of an electrode assembly kneading device according to some embodiments of the present application;

[0032] Fig. 3 is a structural schematic diagram of an electrode assembly kneading device according to some embodiments of the present application;

[0033] Fig. 4 is a structural schematic diagram of a dust removal cover according to some embodiments of the present application;

[0034] Fig. 5 is a structural schematic diagram of a dust removal cover according to some embodiments of the present application;

[0035] Fig. 6 is a structural schematic diagram of a dust removal cover according to some embodiments of the present application;

[0036] Fig. 7 is a structural schematic diagram of a dust removal cover according to some embodiments of the present application.

[0037] Legend of reference numerals:

[0038] 1, electrode assembly kneading device;

[0039] 11, kneading member; 111, kneading head; 1111, kneading portion; 1112, extruding portion;

[0040] 12, connecting member; 121, first end surface; 122, second end surface; 123, suction passage;

[0041] 13, dust removal cover; 131, third end surface; 132, fourth end surface; 133, suction inlet; 134, body; 1341, arc-shaped end surface; 135, pipe body; 136, notch;

[0042] L, central axis. DETAILED DESCRIPTION

[0043] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0045] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0046] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0048] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0052] In the structure of the battery, it usually includes one or more battery monomers, that is, the battery monomer is the smallest unit to constitute the battery. Among them, the plurality of battery monomers can be in series or parallel or mixed connection, and the mixed connection means that there are series and parallel connections in the plurality of battery monomers.

[0053] In the structure of the battery monomer, it further includes an electrode assembly. The electrode assembly is a component that undergoes electrochemical reaction in the battery monomer. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet. The part of the positive electrode sheet and the negative electrode sheet having active material constitutes the main part of the electrode assembly, and the part of the positive electrode sheet and the negative electrode sheet not having active material forms a tab respectively.

[0054] For the electrode assembly of the cylindrical battery monomer, the electrode assembly is formed by stacking and winding the positive electrode sheet, the separator and the negative electrode sheet. After the electrode assembly is formed by winding, the tab needs to be shaped by mechanical rubbing or direct extrusion rubbing to form a relatively dense end face, so as to facilitate welding with other structures in the subsequent processing process.

[0055] During the flattening process, debris will be generated when the tab rubs against the flattening roller, and the debris can fall into the inside of the electrode assembly through the channel between the two adjacent tabs, causing a short circuit, and also causing the problems of poor high-voltage test and poor self-discharge of the electrode assembly, thereby affecting the quality of the battery cell.

[0056] Based on the above technical problems, the present application provides an electrode assembly flattening device. The electrode assembly flattening device comprises a flattening component, a connecting piece and a dust removal cover.

[0057] The flattening component comprises a plurality of flattening heads arranged at intervals and used for flattening the end face of the electrode assembly. The connecting piece has a first end face, a second end face arranged opposite to the first end face along the axial direction of the connecting piece, and a suction channel connecting the first end face and the second end face, and the first end face of the connecting piece is connected with the flattening component and used for driving the flattening component to rotate. The dust removal cover has a third end face and a fourth end face arranged opposite to each other along the axial direction of the connecting piece and internally connected in fluid communication, the third end face is formed with a suction inlet, and the fourth end face is connected with the first end face and the suction channel; the dust removal cover comprises a body and a plurality of pipe bodies connected with the body. The dust removal cover has a central axis, the plurality of pipe bodies are arranged at intervals around the central axis, each pipe body among the plurality of pipe bodies has an opening toward one side of the central axis, and the openings are connected with each other, the side of the plurality of pipe bodies away from the body defines the suction inlet, and at least part of any one flattening head is accommodated between two adjacent pipe bodies.

[0058] Therefore, the plurality of flattening heads and the dust removal cover are driven by the connecting piece, so that the flattening of the electrode assembly and the suction of the debris can be performed synchronously. The dust removal cover is obtained by connecting two parts, which is convenient for processing and has a regular shape and size, the openings are connected with each other, so that the plurality of pipe bodies collectively define a closed suction inlet, the plurality of pipe bodies are connected at the central position of the suction inlet, thereby covering as many positions on the end face as possible, the positions on the end face include the central region of the end face and the region between the central region and the edge of the end face, so that the debris in the central region and the region between the central region and the edge of the end face can be fully sucked, improving the comprehensiveness of the debris suction. At the same time, at least part of the flattening head is accommodated between two adjacent pipe bodies, so that the edge of the suction inlet can be as close to the end face of the electrode assembly as possible, and the negative pressure generated at the suction inlet can act on the end face more effectively, correspondingly, the suction force on the debris is also greater, and the debris is more likely to leave the end face, thereby improving the reliability of the debris suction. Under the condition that the dust removal cover can cover the end face as much as possible and be as close to the end face as possible, correspondingly, the probability of the debris falling into the inside of the electrode assembly is reduced, thereby improving the performance and quality of the battery cell.

[0059] The electrode assembly flattening device disclosed by the embodiments of the present application can be applied to the flattening of the tab on the electrode assembly in a cylindrical battery cell, so as to alleviate the phenomenon that the tab falls into the inside of the electrode assembly during the flattening process, and further improve the stability of the battery cell performance and the service life of the battery cell.

[0060] Please refer to FIG. 1 to FIG. 7, FIG. 1 is a structural schematic diagram of the electrode assembly flattening device according to some embodiments of the present application; FIG. 2 is a structural schematic diagram of the electrode assembly flattening device according to some embodiments of the present application; FIG. 3 is a structural schematic diagram of the electrode assembly flattening device according to some embodiments of the present application; FIG. 4 is a structural schematic diagram of the dust removal cover according to some embodiments of the present application; FIG. 5 is a structural schematic diagram of the dust removal cover according to some embodiments of the present application; FIG. 6 is a structural schematic diagram of the dust removal cover according to some embodiments of the present application; FIG. 7 is a structural schematic diagram of the dust removal cover according to some embodiments of the present application.

[0061] The embodiments of the present application provide an electrode assembly flattening device 1. As shown in FIG. 1 to FIG. 7, the electrode assembly flattening device 1 comprises a flattening component 11, a connecting piece 12 and a dust removal cover 13.

[0062] The flattening component 11 comprises a plurality of flattening heads 111 arranged at intervals, and the plurality of flattening heads 111 are used for flattening the end face of the electrode assembly. The connecting piece 12 has a first end face 121, a second end face 122 and an air extraction channel 123 in communication with the first end face 121 and the second end face 122, and the first end face 121 of the connecting piece 12 is connected with the flattening component 11 and used for driving the flattening component 11 to rotate. The dust removal cover 13 has a third end face 131 and a fourth end face 132 arranged oppositely along the axial direction of the connecting piece 12 and in internal fluid communication, the third end face 131 is formed with a suction port 133, the fourth end face 132 is connected with the first end face 121 and the air extraction channel 123; the dust removal cover 13 comprises a body 134 and a plurality of pipe bodies 135 connected with the body 134. The dust removal cover 13 has a central axis L, the plurality of pipe bodies 135 are arranged at intervals around the central axis L, each pipe body 135 among the plurality of pipe bodies 135 has an opening toward one side of the central axis L, and the openings are in communication with each other, the side of the plurality of pipe bodies 135 away from the body 134 defines the suction port 133, and at least part of any one flattening head 111 is accommodated between two adjacent pipe bodies 135.

[0063] For the whole electrode assembly, the tab is located at the end of the main body part along the extension direction of the winding axis, and the end face of the electrode assembly refers to the position of the tab on the electrode assembly along the extension direction of the winding axis.

[0064] In the process of flattening the end face of the electrode assembly, the flattening heads 111 are in contact with the end face of the electrode assembly, and the plurality of flattening heads 111 are rotated by the connecting member 12, so that the tab is shaped by the extrusion of the flattening heads 111 to form a relatively dense end face.

[0065] In one example, the connecting member 12 can be a flange plate, and the flattening heads 111 are rotatably installed on the flange plate, the axis of the flange plate coincides with the axis of the electrode assembly, the connecting member 12 is connected with the dust cover 13, and when the plurality of flattening heads 111 and the dust cover 13 are rotated around the axis of the flange plate, the plurality of flattening heads 111 can rotate around the center of the end face and adaptively rotate on the end face, so that the rolling extrusion of the end face is realized in the process of adaptive rotation of the flattening heads 111.

[0066] The suction port 133 is an opening on the side of the dust cover 13 facing the end face of the electrode assembly, which is defined by a plurality of tube bodies. Correspondingly, the suction port 133 is used to be oppositely arranged with the end face of the electrode assembly, so that the negative pressure generated at the suction port 133 can effectively act on the end face of the electrode assembly. At the same time, the size of the suction port 133 can be adapted to the size of the end face of the electrode assembly, so that the suction port 133 can cover the end face of the electrode assembly as much as possible. In the flattening process, the debris generated by the end face of the electrode assembly is sucked into the dust cover 13 by the suction port 133 under the action of negative pressure, and then enters the suction channel 123 through the fourth end face 132 and the first end face 121 in turn. The debris can finally be discharged through the second end face 122 and collected. The connecting member 12 drives the flattening heads 111 and the dust cover 13 to rotate synchronously to realize the synchronous suction of the debris in the flattening process.

[0067] At least part of the flattening heads 111 is accommodated between the adjacent two tube bodies 135, that is, at least part of the flattening heads 111 is embedded between the adjacent two tube bodies 135, so that the suction port 133 can be as close to the end face of the electrode assembly as possible. It can be understood that the more the flattening heads 111 are embedded, the smaller the distance between the suction port 133 and the end face, and the better the suction effect of the debris. As long as the part of the flattening heads 111 in contact with the end face can exceed the edge of the suction port 133, the edge of the suction port 133 will not interfere with the end face in the flattening process.

[0068] The plurality of rubbing heads 111 and the dust removal cover 13 are driven by the connecting piece 12, so that the rubbing of the electrode assembly and the suction of the debris can be performed synchronously. The dust removal cover 13 is obtained by connecting two parts, which is convenient for processing and has a regular shape and size. The plurality of openings are in communication with each other, so that the plurality of pipe bodies 135 jointly define a closed suction inlet 133. The plurality of pipe bodies 135 are communicated at the central position of the suction inlet 133, so as to cover as many positions on the end face as possible, including the central region of the end face and the region between the central region and the edge of the end face. Therefore, the debris in the central region and the region between the central region and the edge of the end face can be fully sucked, and the comprehensiveness of the debris suction is improved. Meanwhile, at least part of the rubbing head 111 is accommodated between the adjacent two pipe bodies 135, so that the edge of the suction inlet 133 can be as close to the end face of the electrode assembly as possible. Therefore, the negative pressure generated at the suction inlet 133 can more effectively act on the end face, and correspondingly, the suction force on the debris is greater, and the debris is more likely to leave the end face, thereby improving the reliability of the debris suction. In the case that the dust removal cover 13 can cover the end face as much as possible and be as close to the end face as possible, the probability of the debris falling into the electrode assembly is reduced, and the performance and quality of the battery cell are improved.

[0069] According to some embodiments of the present application, as shown in FIGS. 4-6, a gap 136 is arranged on the side of the adjacent two pipe bodies 135 away from the body 134, and at least part of the rubbing part 1111 of the rubbing head 111 is accommodated in the gap 136.

[0070] The gap 136 can be cut after the opening connection between the adjacent two pipe bodies 135.

[0071] The rubbing head 111 comprises the rubbing part 1111 and the extrusion part 1112 connected with each other. The rubbing part 1111 is in the shape of a cone, and the extrusion part 1112 is in the shape of a cylinder. The side surface of the rubbing part 1111 is used to contact the end face of the electrode assembly, so as to directly roll and rub the end face. The connecting part of the extrusion part 1112 and the rubbing part 1111 is used to contact the edge of the end face of the electrode assembly, so as to limit and extrude the edge, so that the tab can be rubbed as close to the center of the end face as possible, and the tab is reduced.

[0072] By arranging the gap 136 to accommodate the rubbing part 1111, the overall structure is more compact, and the end of the pipe body 135 away from the body 134 can be further close to the end face of the electrode assembly, i.e., the suction inlet 133 is closer to the end face of the electrode assembly. Therefore, the negative pressure generated at the suction inlet 133 can more effectively act on the end face, and correspondingly, the suction force on the debris is greater, and the debris is more likely to leave the end face, thereby improving the reliability of the debris suction.

[0073] According to some embodiments of the present application, as shown in FIGS. 1-2, the notch 136 is located on the side of the flattening head 111 away from the end face of the electrode assembly.

[0074] The dust cover 13, the flattening head 111, and the end face of the electrode assembly are sequentially arranged along the direction of the central axis of the dust cover 13.

[0075] By arranging the notch 136 on the side of the flattening head 111 away from the end face of the electrode assembly, when the dust cover 13, the flattening head 111, and the end face of the electrode assembly are sequentially arranged, the concave notch 136 can accommodate the flattening portion of the corresponding flattening head 111, the space between the two adjacent tube bodies 135 can accommodate the extrusion portion 1112 of the corresponding flattening head 111, and the convex tube body 135 can extend into the gap between the two adjacent flattening heads 111, so that the suction port 133 can be as close as possible to the end face of the electrode assembly, thereby effectively and reliably sucking the debris generated on the end face.

[0076] According to some embodiments of the present application, as shown in FIG. 2, the projection of the body 134 and the flattening portion 1111 of the flattening head 111 on the projection plane at least partially overlaps, and the tube body 135 and the flattening portion 1111 do not overlap. The projection plane is defined as a plane perpendicular to the central axis.

[0077] The flattening portion 1111 of the flattening head 111 is avoided by the notch 136, and the extrusion portion 1112 is avoided by the space between the two adjacent tube bodies 135, so that the suction port 133 can be closer to the end face of the electrode assembly.

[0078] By arranging the projection of the body 134 and the flattening portion 1111 to overlap, the space between the two adjacent tube bodies 135 and the notch 136 can accommodate the flattening portion 1111 as much as possible, thereby achieving sufficient avoidance of the flattening portion 1111. At the same time, the projection of the tube body 135 and the flattening portion 1111 does not overlap, so that the convex tube body 135 can extend into the gap between the two adjacent flattening heads 111 without interference, thereby enabling the suction port 133 to be as close as possible to the end face of the electrode assembly.

[0079] According to some embodiments of the present application, as shown in FIGS. 5 and 6, the axes of the plurality of tube bodies 135 are parallel to each other and parallel to the central axis.

[0080] The tube body 135 extends along its own axis, and the axis of the tube body 135 is parallel to the central axis, so the tube body 135 is a straight tube.

[0081] By arranging the axis of the tube body 135 parallel to the central axis, the channel in the tube body 135 is a straight channel, which facilitates the smooth flow of airflow in the tube body 135, thereby improving the efficiency of debris suction.

[0082] According to some embodiments of the present application, as shown in FIG. 6, the cross-sectional area of each of the plurality of pipe bodies 135 at each position in the direction along the axis of the pipe body is the same.

[0083] The cross-sectional area of the pipe body 135 refers to the area of the cross-section of the pipe body 135 perpendicular to the axis of the pipe body, and the cross-sectional area of the pipe body 135 at each position in the direction along the axis is the same, so the size of the pipe body 135 at each position is the same, and the pipe body 135 is a regular-shaped pipe body 135.

[0084] In one example, the pipe body 135 can be a circular pipe or a flat pipe with a plane.

[0085] By selecting a pipe body 135 with the same size at each position, it is beneficial for material selection and processing, and thus facilitates the manufacture of the dust cover 13 by welding.

[0086] According to some embodiments of the present application, as shown in FIGS. 4, 5 and 7, one end of the body 134 has an arc-shaped end face 1341, and one end of the plurality of pipe bodies 135 is welded to the arc-shaped end face 1341, and the plurality of pipe bodies 135 are in communication with the body 134.

[0087] In one example, one end of the pipe body 135 has an arc surface that fits the arc-shaped end face 1341, and a through hole that matches one end of the pipe body 135 is formed on the arc-shaped end face 1341. After aligning one end of the plurality of pipe bodies 135 with the through hole, the pipe body 135 is welded to the body 134, and the opening between the adjacent two pipe bodies 135 is welded, and after the notch 136 is formed, the dust cover 13 is formed.

[0088] By setting the end face connecting the body 134 and the pipe body 135 to be an arc-shaped end face, the contact area between the pipe body 135 and the body 134 is increased, and the reliability of the welding between the pipe body 135 and the body 134 is improved. At the same time, the arc-shaped end face 1341 is also beneficial for the flow of the airflow in the body 134, and thus improves the effect of debris suction.

[0089] According to some embodiments of the present application, as shown in FIGS. 1 to 3, the rotation axis of the kneading flat part 11 coincides with the central axis L of the dust cover 13.

[0090] During the kneading process, the kneading flat part 11 rotates around the center of the end face of the electrode assembly, that is, the rotation axis of the kneading flat part 11 coincides with the center of the end face.

[0091] By setting the rotating axis of the kneading part 11 coincident with the central axis L of the dust cover 13, the central axis L of the dust cover 13 is coincident with the center of the end face, so that the suction port 133 can cover the center of the end face, so that the debris in the center of the end face can be fully sucked, and the effect of debris suction is improved.

[0092] According to some embodiments of the present application, the electrode assembly kneading device 1 further comprises an air suction fan, which is communicated with the air suction channel 123.

[0093] In one example, as shown in FIG. 3, the air inlet pipe of the air suction fan can be connected with the second end face 122 of the connecting piece 12, so that the air suction pipe is communicated with the air suction channel 123.

[0094] By setting the air suction fan as the power source of debris suction, the air suction fan, the air suction channel 123 and the dust cover 13 are communicated in sequence, and under the condition that the air suction fan is turned on, negative pressure can be generated at the suction port 133, so that the debris on the end face of the electrode assembly is sucked to reduce the probability of the debris falling into the inside of the electrode assembly.

[0095] The embodiments of the present application will be further described in detail below in combination with FIGS. 1-7.

[0096] The connecting piece is a flange plate, three kneading heads 111 are uniformly arranged on the flange plate in the circumferential direction, the three kneading heads 111 are rotationally connected with the flange plate, the kneading heads 111 are used for abutting with the end face of the electrode assembly, the dust cover is connected with the flange plate, and the suction port on the dust cover is used for facing the end face of the electrode assembly. Under the condition that the flange plate rotates, the three kneading heads 111 and the dust cover 13 can be driven to rotate, so that the debris can be sucked during the kneading process.

[0097] The dust cover 13 is welded by a body and three flat tube bodies 135, each of the three tube bodies 135 has an opening on the side facing the central axis L of the dust cover 13, and the openings are communicated with each other. A gap 136 is arranged between the adjacent two tube bodies 135, and the side of the three tube bodies 135 away from the body 134 collectively defines a suction port 133, so that the suction port 133 can cover the end face of the electrode assembly as much as possible, so that the debris in the central region of the end face and the region between the central region and the edge of the end face can be fully sucked, and the comprehensiveness of the debris suction is improved.

[0098] Part of the extrusion part 1112 of the kneading head 111 is contained between the adjacent two tube bodies 135, and part of the kneading part 1111 of the kneading head 111 is contained in the gap 136, so that the suction port 133 can be closer to the end face of the electrode assembly, and the reliability of the debris suction is improved.

[0099] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode assembly leveling device, comprising: The smoothing component includes a plurality of smoothing heads spaced apart, the plurality of smoothing heads being used to smooth the end face of the electrode assembly; A connector has a first end face, a second end face, and an air extraction channel connecting the first end face and the second end face, the first end face of the connector being connected to the kneading component and used to drive the kneading component to rotate; and A dust collector hood has a third end face and a fourth end face that are axially opposite to each other along the connector and are in fluid communication with each other. The third end face forms an intake port, and the fourth end face is connected to the first end face and to the exhaust channel. The dust collector hood includes a body and a plurality of tubes connected to the body. The dust collector hood has a central axis, and the plurality of tubes are spaced apart around the central axis. Each of the plurality of tubes has an opening on one side facing the central axis, and the openings are in communication with each other. The intake port is defined on the side of the plurality of tubes away from the body. At least a portion of any one of the plurality of flattening heads is accommodated between two adjacent tubes.

2. The electrode assembly leveling device according to claim 1, wherein, A notch is provided on the side away from the main body between two adjacent tubes, and at least a portion of the flattening part of the flattening head is accommodated in the notch.

3. The electrode assembly leveling device according to claim 2, wherein, The notch is located on the side of the flattening head opposite to the end face of the electrode assembly.

4. The electrode assembly leveling device according to claim 2, wherein, The notch is formed by cutting at the connection between two adjacent tubes.

5. The electrode assembly flattening device according to any one of claims 1 to 4, wherein, The orthographic projections of the body and the flattening part of the flattening head on the projection plane at least partially overlap, while the orthographic projections of the tube body and the flattening part on the projection plane do not overlap. The projection plane is a plane perpendicular to the central axis.

6. The electrode assembly leveling device according to any one of claims 1 to 5, wherein, The axes of the plurality of tubes are parallel to each other and parallel to the central axis.

7. The electrode assembly leveling device according to claim 6, wherein, The cross-sectional area of ​​each of the plurality of tubes is equal at all positions along the axis of the tube.

8. The electrode assembly leveling device according to any one of claims 1 to 7, wherein, One end of the main body has an arc-shaped end face, and one end of the plurality of tubes is welded to the arc-shaped end face, and the plurality of tubes are connected to the main body.

9. The electrode assembly leveling device according to claim 8, wherein, One end of each of the plurality of tubes has an arc surface adapted to the arc-shaped end face, and the arc surface is welded to the arc-shaped end face; the arc-shaped end face is provided with a plurality of through holes corresponding to the plurality of tubes, and the through holes are connected to the corresponding tubes.

10. The electrode assembly leveling device according to any one of claims 1 to 9, wherein, The rotation axis of the kneading component coincides with the central axis of the dust removal hood.

11. The electrode assembly leveling device according to any one of claims 1 to 10, wherein, The electrode assembly kneading device also includes a suction fan; The suction fan is connected to the air extraction channel.

12. The electrode assembly leveling device according to any one of claims 1 to 11, wherein, The flattening head includes a flattening section and a squeezing section connected to the flattening section.

13. The electrode assembly leveling device according to claim 12, wherein, The flattening section is configured as a conical flattening section, and the outer surface of the flattening section is used to contact the end face of the electrode assembly.

14. The electrode assembly leveling device according to claim 12, wherein, The extrusion section is configured as a cylindrical extrusion section, and the connection portion between the extrusion section and the flattening section is used to contact the edge of the end face of the electrode assembly.

15. The electrode assembly leveling device according to any one of claims 1 to 14, wherein, The electrode assembly flattening device also includes a mounting base; The mounting base is detachably connected to the connector, and the kneading head is rotatably connected to the mounting base.

16. The electrode assembly leveling device according to any one of claims 1 to 15, wherein, The outer surface of the tube has a plane, which is parallel to the central axis.

17. The electrode assembly leveling device according to any one of claims 1 to 16, wherein, The connector is configured as a flange, and the rotation axis of the flange coincides with the central axis.

18. The electrode assembly leveling device according to any one of claims 1 to 17, wherein, The number of the kneading heads is three, and the three kneading heads are evenly spaced around the central axis.

19. The electrode assembly leveling device according to any one of claims 1 to 18, wherein, The number of tubes is three, and the three tubes are evenly spaced around the central axis.

20. A battery production system comprising an electrode assembly leveling device as claimed in any one of claims 1 to 19.

Images