Scribing assembly and coating mechanism

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a scribing assembly and a coating mechanism for coating a pole piece. The scribing assembly is used for scribing a coating on the surface of a coated pole piece, the scribing assembly comprises a fixing piece and a scribing tooth set arranged on the periphery of the fixing piece, the scribing tooth set comprises a plurality of scribing teeth which are linearly arranged in the axial direction of the fixing piece, and the scribing teeth are provided with tips making contact with the pole piece. Compared with the prior art, the scribing assembly can accurately scribe lines when the active material layer is still in an undried state, and compared with a traditional laser etching method, the innovation has the advantages that the loss of active substances is remarkably reduced, and therefore the utilization efficiency of the active substances is improved. And more importantly, the problem of dust particles possibly generated by secondary processing is effectively avoided, the high quality of pole piece processing is further ensured, and optimization and upgrading of the process are realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery production and manufacture, and particularly relates to a scribing assembly and coating mechanism. BACKGROUND

[0002] In today's era of rapid technological development, secondary battery technology is iterating and updating at an unprecedented speed, and the performance standards of its battery products are also constantly improving, exhibiting many eye-catching features such as fast charging technology. These advanced technological innovations have profoundly changed our way of life, bringing unprecedented convenience and efficiency to our clothing, diet, housing, and travel.

[0003] However, as for the widely used fast charging technology of secondary batteries, its implementation process often requires a series of complex secondary processing of the electrode sheet. For example, laser etching technology is one of the common processing methods, which can create pores or lines on the surface of the electrode sheet to meet the demand of fast charging technology to some extent. However, it is undeniable that this technology also brings many problems. It requires additional processing of the electrode sheet, which not only increases the complexity of the production process, but also may cause loss of active materials on the surface coating of the electrode sheet and generate secondary dust. In order to solve these problems, enterprises have to add additional dust removal systems, which undoubtedly further increases the cost of equipment investment and overall manufacturing cost.

[0004] Therefore, in the face of such a situation, it is urgent to develop a new type of electrode sheet production device to solve the above problems. INVENTION CONTENTS

[0005] One of the purposes of the utility model is to provide a scribing assembly to meet the demand of fast charging technology in a more efficient and environmentally friendly way in view of the deficiencies of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A scribing assembly for scribing the active material coating on the surface of the coated electrode sheet, the scribing assembly comprising a fixing member and a scribing tooth group arranged on the outer periphery of the fixing member, the scribing tooth group comprising a plurality of scribing teeth arranged in a straight line along the axial direction of the fixing member, the scribing teeth having a sharp end in contact with the electrode sheet.

[0008] The scribing tooth group is arranged in multiple groups in the circumferential direction on the outer periphery of the fixing member.

[0009] The scribing tooth structures of the multiple scribing tooth groups are completely identical or partially identical.

[0010] The scribing tooth structures of each scribing tooth group are different.

[0011] The plurality of scribe groups are evenly distributed in the circumferential direction of the fixing member.

[0012] The distance between the tips of adjacent scribes in each scribe group is k, and k satisfies 1mm≤k<30mm.

[0013] The vertical distance between the scribe tip and the outer periphery of the fixing member is a, and a satisfies 2mm<a<200mm.

[0014] The cross section of the scribe is a triangular structure, and the tip is located at the top angle of the triangular structure, and the angle α of the top angle satisfies: 0°<α≤120°.

[0015] A coating mechanism, comprising a coating assembly, a scribe assembly and a heating assembly arranged in sequence along the conveying direction of the pole piece, the scribe assembly is the above-mentioned scribe assembly, the coating mechanism further comprises a second over roller arranged opposite to the scribe assembly, the second over roller is used for conveying the pole piece and cooperating with the scribe assembly to scribe the pole piece in conveying.

[0016] The scribe depth of the scribe assembly scribing the pole piece is y, 0%H<y<90%H, H is the coating thickness of the pole piece coated by the coating assembly, Wherein V is the conveying speed of the pole piece, L is the coating flow, and K is the coating width 。

[0017] Compared with the prior art, the scribe assembly of the present application can accurately scribe when the active material layer is still in the un-dried state, which not only significantly reduces the loss of active substances, thereby improving the utilization efficiency of active substances, but also greatly reduces the additional purchase cost of equipment.

[0018] (2) The scribe assembly of the present application can accurately scribe when the active material layer is still in the un-dried state, which can effectively avoid the problem of dust particles generated by secondary processing, further ensures the high quality of the pole piece processing, and realizes the optimization and upgrading of the process. BRIEF DESCRIPTION OF DRAWINGS

[0019] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 The structure diagram of the scribe assembly for pole piece coating of an embodiment of the present application;

[0021] Figure 2 The structure diagram of the coating mechanism of an embodiment of the present application;

[0022] Figure 3 The Figure 1 The enlarged view of A in FIG.

[0023] Wherein, the reference signs are explained as follows:

[0024] 1, scribe assembly; 11, fixing member; 12, scribe; 13, top corner; 2, base material unwinding assembly; 3, coating assembly; 4, heating assembly; 5, surface density detection assembly; 6, material receiving assembly; 7, first passing roller; 8, second passing roller. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work under the premise that the embodiments in the present application are within the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0027] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments.

[0028] The present application will be described in further detail below in conjunction with the drawings in the embodiments of the present application and the specific embodiments, but not as a limitation on the present application. Figures 1 to 3

[0029] As shown in the drawings, the present application comprises the following steps: Figure 1 ​As shown, the utility model provides a scribe assembly 1 for scribing the coated pole piece, the scribed area is the active material coating on the surface of the pole piece, the scribe assembly 1 includes fixing piece 11 and the scribe tooth group arranged on the outer periphery of the fixing piece, the scribe tooth group includes a plurality of scribe teeth 12 arranged in a straight line along the axial direction of the fixing piece, and the scribe tooth 12 has a pointed end in contact with the pole piece. The scribe assembly 1 can accurately scribe when the active material layer is still in the undried state. Compared with the traditional laser etching method, not only the loss of active material is significantly reduced, thereby improving the utilization efficiency of active material, but also the additional purchase cost of equipment is greatly reduced. More importantly, it effectively avoids the problem of dust particles generated by secondary processing, further ensures the high quality of pole piece processing, and realizes the optimization and upgrading of the process.

[0030] The fixing piece 11 of the scribe assembly 1 is fixed during use, but before use, the fixing piece 11 can move along the depth direction according to the depth requirement of the scribed line on the pole piece, and flexibly approach or move away from the surface of the pole piece.

[0031] In an embodiment according to the utility model, the scribe tooth groups are arranged in multiple groups in the circumferential direction of the fixing piece.

[0032] In an embodiment according to the utility model, the scribe teeth 12 of the multiple scribe tooth groups are completely identical or partially identical in structure.

[0033] In an embodiment according to the utility model, the scribe teeth 12 of each scribe tooth group are different in structure.

[0034] Specifically, the different structures of the scribe teeth 12 of the multiple scribe tooth groups can be reflected in the tooth tip width and tooth tip angle of the scribe teeth 12, and each parameter is directly related to the effect of scribing on the pole piece.

[0035] When the scribe teeth 12 scribe on the pole piece, the scribe teeth 12 are fixed, and the pole piece moves with the second roller 8; but when the scribe tooth group is damaged, another scribe tooth group with the same parameters can continue to scribe. The advantage of this design is that it gives the coating mechanism greater flexibility and adaptability.

[0036] When different parameters of scribe are needed for different parameters of pole piece, the scribe tooth group with corresponding parameters can be directly replaced; according to different production requirements or different types of pole pieces, the scribe tooth can be quickly replaced, so that the goal of scribing different parameter lines on different pole pieces is easily realized. The arrangement of multiple scribe tooth groups not only improves the functionality and practicability of the coating mechanism, but also improves the production efficiency in an invisible way, which not only saves time, but also reduces production cost.

[0037] In an embodiment according to the utility model, the multiple scribe tooth groups are evenly distributed in the circumferential direction of the fixing piece.

[0038] In an embodiment according to the present application, the distance between the tips of adjacent teeth 12 on each tooth group is k, and k satisfies 1mm≤k<30mm. The distance between the tips of adjacent teeth 12 on each tooth group directly determines the line spacing when the lines are finally drawn on the pole piece. In order to meet the diversified production needs and adapt to different types of pole pieces, in order to accurately draw the lines on the pole piece that can most improve the fast charging performance, we can flexibly select tooth groups with different distances between the tips of adjacent teeth 12 according to the specific circumstances, in order to adjust the distance between adjacent lines.

[0039] In an embodiment according to the present application, the vertical distance between the tip of the tooth 12 and the outer periphery of the fixing member is a, and a satisfies 2mm<a<200mm.

[0040] In an embodiment according to the present application, the cross section of the tooth 12 is a triangular structure, the tip is located at the top corner 13 of the triangular structure, and the angle a of the top corner 13 satisfies: 0°<a≤120°. The specific shape of the tooth 12 can be a figure with a triangular cross section such as a cone, a tetrahedron, etc. The top corner 13 is the part of the tooth that contacts the active material layer for line drawing, and the angle is 0°<a≤120°, and is further preferably 0°<a≤60°. The angle can control the groove shape formed by the line drawing, and can be changed according to the requirements of the pole piece.

[0041] As shown in Figure 2 The utility model also provides a coating mechanism which comprises a base material unwinding assembly 2, a coating assembly 3, a line drawing assembly 1, a heating assembly 4, a surface density detection assembly 5 and a material receiving assembly 6 which are sequentially arranged along the conveying direction of the pole piece, and a plurality of first over-rollers 7 for carrying and conveying the pole piece and a second over-roller 8 which is arranged opposite to the line drawing assembly 1; wherein the line drawing assembly 1 is the line drawing assembly 1 for coating the pole piece as described above.

[0042] In an embodiment according to the present application, the line drawing depth of the line drawing assembly 1 for drawing lines on the pole piece is y, and 0%H<y<90%H, H is the coating thickness of the pole piece coated by the coating assembly, wherein V is the conveying speed of the pole piece, L is the coating flow, and K is the coating width 。The unit of V is m / min, the unit of L is L / min, the unit of K is mm, and the unit of H is mm / μm. The thickness H of the pole piece coating is related to the running speed V of the pole piece, the coating flow L of the coating assembly 3, and the coating width K. In order to ensure the consistency of the pole piece scribing, the running speed V of the pole piece, the coating flow L of the coating assembly 3, and the coating width K related parameters should be strictly controlled to ensure the overall performance and stability of the pole piece group. The appropriate scribing depth can increase the effective reaction area of the pole piece and improve the charge and discharge efficiency of the battery. Too shallow scribing may result in insufficient reaction area and reduce the charge and discharge efficiency; and too deep scribing may increase the internal resistance, also affecting the charge and discharge efficiency.

[0043] According to the disclosure and teaching of the above description, those skilled in the art of the present application can also make changes and modifications to the above embodiments. Therefore, the present application is not limited to the above specific embodiments, and any obvious improvements, replacements or modifications made by those skilled in the art on the basis of the present application shall fall within the scope of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of explanation and do not constitute any limitation on the present application.

Claims

1. A scribe assembly, comprising: The scribing assembly for scribing the surface coating of the coated pole piece comprises a fixing member and a scribing tooth group arranged on the outer periphery of the fixing member, the scribing tooth group comprises a plurality of scribing teeth arranged in a straight line along the axial direction of the fixing member, and the scribing teeth have a pointed end for contacting the pole piece; a plurality of scribing tooth groups are uniformly distributed in the circumferential direction of the fixing member.

2. The scribe assembly of claim 1, wherein, The scribing tooth groups are arranged in the circumferential direction on the outer periphery of the fixing member.

3. The scribe assembly of claim 2, wherein, The scribing teeth of the plurality of scribing tooth groups are completely identical or partially identical.

4. The scribe assembly of claim 2, wherein, The scribing teeth of each scribing tooth group are different.

5. The scribe assembly of claim 1, wherein, The distance between the pointed ends of adjacent scribing teeth on each scribing tooth group is k, and k satisfies 1mm≤k<30mm.

6. The scribe assembly of claim 1, wherein, The vertical distance between the pointed end of the scribing tooth and the outer periphery of the fixing member is a, and a satisfies 2mm<a<200mm.

7. The scribe assembly of claim 1, wherein, The cross section of the scribing tooth is a triangular structure, the pointed end is located at the top corner of the triangular structure, and the angle α of the top corner satisfies 0°<α≤120°.

8. A coating mechanism characterized by, The coating mechanism comprises a coating assembly, a scribing assembly and a heating assembly arranged in sequence along the conveying direction of the pole piece, the scribing assembly is the scribing assembly according to any one of claims 1-7, and the coating mechanism further comprises a second passing roller arranged opposite to the scribing assembly, the second passing roller is used for conveying the pole piece and scribing the pole piece in conveying in cooperation with the scribing assembly.

9. The coating mechanism of claim 8, wherein, The depth of the scribe of the scribe assembly to the scribe of the pole piece is y, 0%H < y < 90%H, H is the coating thickness of the pole piece coated by the coating assembly, Wherein V is the conveying speed of the pole piece, L is the coating flow, and K is the coating width.

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