Pole piece forming compression roller assembly and pole piece processing equipment

Abstract

The utility model provides a pole piece forming compression roller assembly and pole piece processing equipment. The pole piece forming compression roller assembly comprises a first roller shaft and a second roller shaft which are oppositely arranged, a protruding part protruding outwards in the radial direction of the first roller shaft is arranged on the roller face of the first roller shaft, a concave part concave inwards in the radial direction of the second roller shaft is arranged on the roller face of the second roller shaft, and the outlines of the protruding part and the concave part are each provided with a plurality of edges connected end to end on the expanded drawings of the peripheral faces of the first roller shaft and the second roller shaft. The convex part and the concave part are correspondingly arranged, when the first roller shaft and the second roller shaft synchronously and reversely rotate, the convex part can be located in the concave part, and an accommodating cavity for accommodating an electrode material is formed between the convex part and the concave part. According to the pole piece forming compression roller assembly disclosed by the utility model, a polygonal electrode structure body can be rolled through the convex part and the concave part which are respectively arranged on the first roller shaft and the second roller shaft, so that the preparation of a polygonal pole piece is facilitated, and a good use effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pole piece processing, and in particular to a pole piece forming roller assembly. The utility model also relates to a pole piece processing device provided with the pole piece forming roller assembly. Background Art

[0002] At present, cylindrical batteries can only be prepared by winding due to the constraints of shape design. Due to the limitations of the winding process, the space utilization rate of the battery cell is lower than that of the laminated battery, and the bending of the pole piece will cause uneven force during the charging and discharging process, causing deformation and distortion, which will affect the cycle life of the battery. Prismatic batteries can increase space utilization. The pole pieces inside the prismatic battery adopt the same shape, which will increase the space utilization rate inside the battery, and the use of laminated technology can improve the battery life and battery performance.

[0003] Lithium battery pole pieces are usually prepared by wet coating or dry electrode. However, wet coating is more difficult for preparing special-shaped pole pieces such as polygonal pole pieces. The reason is that in the process of preparing polygonal pole pieces by wet coating, due to the fluidity characteristics of the slurry, a lot of raw materials are wasted, resulting in high production costs. Dry electrodes do not use organic solvents, and there is no subsequent solvent drying step, so they have the advantages of low cost, low energy consumption, the ability to prepare thick electrodes, increased mechanical strength, and environmental friendliness. They also have great advantages for preparing special-shaped pole pieces. Therefore, based on the preparation of dry electrodes, it is necessary to develop a device for processing polygonal pole pieces. Utility Model Content

[0004] In view of this, the utility model aims to provide a pole piece forming roller assembly to facilitate the preparation of polygonal pole pieces.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A pole piece forming roller assembly comprises a first roller and a second roller arranged opposite to each other;

[0007] The roller surface of the first roller shaft is provided with a convex portion convex outwardly along the radial direction thereof, and the roller surface of the second roller shaft is provided with a concave portion concave inwardly along the radial direction thereof, and in the unfolded view of the outer circumference of the first roller shaft and the second roller shaft, the contours of the convex portion and the concave portion both have a plurality of edges connected end to end;

[0008] The protrusion and the recess are arranged correspondingly, and when the first roller and the second roller rotate synchronously in opposite directions, the protrusion can be located in the recess, and a receiving cavity for receiving electrode material is formed between the protrusion and the recess.

[0009] Furthermore, in the unfolded view of the outer circumference of the first roller and the second roller, the contour shapes of the protrusion and the recess are regular polygons.

[0010] Furthermore, among the multiple edges in the contours of the protruding portion and the recessed portion, two adjacent edges are connected by arc transition.

[0011] Furthermore, the protrusions are multiple and spaced apart from each other along the axial direction of the first roller shaft; the concave portions are multiple and spaced apart from each other along the axial direction of the second roller shaft, and the multiple protrusions correspond to the multiple concave portions one by one.

[0012] Furthermore, the surface roughness of the protruding portion is greater than the surface roughness of the concave portion.

[0013] Furthermore, the distance between the first roller and the second roller is adjustable.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The pole piece forming roller assembly described in the utility model is provided with a first roller and a second roller arranged relatively to each other, and a protrusion and a recess are respectively provided on the first roller and the second roller, and when the first roller and the second roller rotate synchronously in opposite directions, the protrusion can be located in the recess, so that the electrode material in the accommodating cavity between the protrusion and the recess is pressed into a polygonal electrode structure, which is beneficial to the preparation of polygonal pole pieces and has a good use effect.

[0016] In addition, the contour shape of the raised portion and the recessed portion is a regular polygon, and the structure is relatively simple, which is conducive to the processing and forming of the first roller and the second roller. And by stacking the prepared regular polygonal pole pieces, it can be beneficial to the preparation of prismatic batteries. The adjacent two edges are connected by arc transitions, which can facilitate the formation of the polygonal electrode structure from the recessed portion. The raised portions and the recessed portions are multiple, which is conducive to improving the forming efficiency of the polygonal electrode structure.

[0017] In addition, setting the surface roughness of the protrusion to be greater than that of the concave portion can facilitate the adhesion of the formed polygonal electrode structure to the protrusion of the first roller, and facilitate the subsequent transfer of the polygonal electrode structure to the current collector. The spacing between the first roller and the second roller is adjustable, which can facilitate the preparation of polygonal electrode structures of different thicknesses.

[0018] Another object of the utility model is to provide a pole piece processing equipment, which includes a material extrusion device for outputting the electrode material, and the pole piece forming roller assembly as described above; the pole piece forming roller assembly is located downstream of the material extrusion device, and can receive the material extrusion device to extrude the electrode material.

[0019] Furthermore, the material extrusion device and the pole piece forming roller assembly are each in two groups, the first rollers in the two groups of the pole piece forming roller assemblies are arranged relatively to each other, and a gap is formed between the two first rollers for the current collector to pass through; under the synchronous reverse rotation of the two first rollers, the electrode material located on the protrusion can be pre-attached to both sides of the current collector.

[0020] Furthermore, the pole piece processing equipment also includes a pair of hot pressing rollers located downstream of the two groups of pole piece forming roller assemblies, and the pair of hot pressing rollers are used to press the current collector and the electrode materials on both sides together.

[0021] Furthermore, the pole piece processing equipment also includes a die-cutting device located downstream of the hot pressing rollers.

[0022] The pole piece processing equipment of the utility model adopts the above-mentioned pole piece forming roller pressing assembly and cooperates with the material extrusion device, so that the pole piece forming roller pressing assembly can receive the electrode material extruded by the material extrusion device, which can be beneficial to the loading and transportation of the electrode material and help improve the forming efficiency of the polygonal pole piece structure.

[0023] In addition, two first rollers are provided between which the current collector passes, and under the synchronous reverse rotation of the two first rollers, the electrode material on the protrusion can be pre-attached to both sides of the current collector, so that a polygonal pole piece can be prepared. The hot pressing and counter rollers arranged downstream of the pole piece forming roller assembly can press the current collector and the electrode materials on both sides together, which is conducive to improving the preparation efficiency of the polygonal current collector. The die-cutting device arranged downstream of the hot pressing counter roller is convenient for cutting out the required polygonal pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the pole piece forming rolling assembly according to an embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of the structure of the protrusion according to the embodiment of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the mating state of the convex part and the concave part according to the embodiment of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the pole piece processing equipment according to an embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the polygonal pole piece described in an embodiment of the utility model;

[0030] Description of reference numerals:

[0031] 1. First roller; 2. Second roller; 3. Material extrusion device; 4. Current collector; 5. Hot pressing roller; 6. Die cutting device; 11. Raised part; 21. Concave part;

[0032] 10. Polygonal electrode structure; 20. Tab. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] Embodiment 1

[0038] This embodiment relates to a pole piece forming roller assembly, which is conducive to preparing polygonal pole pieces.

[0039] In terms of overall structure, Figures 1 to 3As shown, the pole piece forming roller assembly of this embodiment comprises a first roller shaft 1 and a second roller shaft 2 arranged opposite to each other. The roller surface of the first roller shaft 1 is provided with a convex portion 11 convex outwardly along its own radial direction, and the roller surface of the second roller shaft 2 is provided with a concave portion 21 concave inwardly along its own radial direction. In the unfolded view of the outer circumference of the first roller shaft 1 and the second roller shaft 2, the contours of the convex portion 11 and the concave portion 21 both have multiple edges connected end to end.

[0040] The raised portion 11 on the first roller 1 and the recessed portion 21 on the second roller 2 are arranged correspondingly, and when the first roller 1 and the second roller 2 rotate synchronously in opposite directions, the raised portion 11 can be located in the recessed portion 21, and a receiving cavity for receiving the electrode material is formed between the raised portion 11 and the recessed portion 21. At this time, the electrode material in the receiving cavity is pressed into a polygonal electrode structure 10, which is conducive to the preparation of a polygonal electrode sheet.

[0041] It should be noted that the electrode material mentioned above is preferably the material used in dry coating in the prior art, such as a mixture including electrode active substances, conductive agents and dry adhesives. The adhesive in the mixture is fiberized and then filled into the above-mentioned accommodating cavity, thereby forming a polygonal electrode structure 10 through rolling by the first roller 1 and the second roller 2, and then compounded with the current collector 4 into a polygonal pole piece.

[0042] Based on the above overall introduction, for details, please refer to Figures 1 to 3 As shown, as a preferred embodiment, in this embodiment, in the development view of the outer circumference of the first roller 1 and the second roller 2, the contour shape of the protrusion 11 and the recessed portion 21 is a regular polygon. And, as a further preferred embodiment, the contour shape of the protrusion 11 and the recessed portion 21 is a regular hexagon or a regular dodecagon.

[0043] In this embodiment, the protrusion 11 and the concave portion 21 have the same contour shape, both of which are regular polygons, and the structure is relatively simple, which is conducive to the processing and forming of the first roller 1 and the second roller 2. And by stacking the prepared regular polygonal pole pieces, it is conducive to the preparation of prismatic batteries.

[0044] As a preferred embodiment, in this embodiment, among the multiple edges in the contours of the protrusion 11 and the recessed portion 21, two adjacent edges are connected by arc transition, for example, two adjacent edges are connected by arc transition, so that the formed polygonal electrode structure 10 can be easily removed from the recessed portion 21. The radius R of the arc can be set accordingly according to actual needs to ensure that the polygonal electrode structure 10 can be smoothly removed.

[0045] It should be noted that the multiple edges of the protrusion 11 and the concave contour in this embodiment may be curved segments or straight line segments. When the contour shape is a regular polygon, it may be, for example, a triangle, a rectangle, a regular pentagon or other regular polygons.

[0046] In the present embodiment, preferably, a plurality of raised portions 11 are arranged axially at intervals along the first roller shaft 1, and a plurality of recessed portions 21 are arranged axially at intervals along the second roller shaft 2, and the plurality of raised portions 11 and the plurality of recessed portions 21 correspond one to one, which is beneficial to improving the forming efficiency of the polygonal electrode structure 10.

[0047] In addition, in this embodiment, it is also preferred that the surface roughness of the protrusion 11 is greater than the surface roughness of the concave portion 21. At this time, the surface of the protrusion 11 is rougher than the surface of the concave portion 21, and the formed polygonal electrode structure can better adhere to the protrusion 11 of the first roller 1, thereby facilitating the subsequent transfer of the polygonal electrode structure 10 to the current collector 4.

[0048] In addition, in this embodiment, the distance between the first roller 1 and the second roller 2 is adjustable. In specific implementation, the first roller 1 and the second roller 2 use an adjustment structure in the prior art to adjust the distance between the first roller 1 and the second roller 2, so as to facilitate the preparation of a polygonal electrode structure with different thicknesses.

[0049] Embodiment 2

[0050] This embodiment relates to a pole piece processing device, such as Figure 4 As shown, the electrode processing equipment includes a material extrusion device 3 for outputting electrode materials, and a pole piece forming roller assembly of embodiment 1. Specifically, the pole piece forming roller assembly is located downstream of the material extrusion device 3, and can receive the electrode material extruded by the material extrusion device 3. In the specific implementation, the material extrusion device 3 can preferably adopt an extruder in the prior art.

[0051] At this time, the above-mentioned pole piece forming roller assembly is used, and combined with the setting of the material extrusion device 3, so that the pole piece forming roller assembly can receive the electrode material extruded by the material extrusion device 3, which can be beneficial to the loading and transportation of the electrode material, and is beneficial to improving the forming efficiency of the polygonal pole piece structure.

[0052] As a preferred embodiment, continue to refer to Figure 4As shown, in this embodiment, the material extrusion device 3 and the pole piece forming roller assembly are both in two groups, the first rollers 1 in the two groups of pole piece forming roller assemblies are arranged oppositely, and a gap for the current collector 4 to pass through is formed between the two first rollers 1. Under the synchronous reverse rotation of the two first rollers 1, the electrode materials on the protrusions 11 on both sides can be pre-attached to both sides of the current collector 4. That is, both sides of the current collector 4 are pre-attached with polygonal electrode structures 10, thereby forming a double-sided polygonal pole piece.

[0053] In addition, the electrode processing equipment of this embodiment also includes a hot pressing roller 5 located downstream of the two sets of electrode forming roller assemblies, and a die-cutting device 6 located downstream of the hot pressing roller 5. The hot pressing roller 5 is used to press the current collector 4 and the electrode materials on both sides together. The roller surface of the hot pressing roller 5 is a smooth roller surface. Through the setting of the hot pressing roller 5, the adhesive in the electrode material is further solidified and fully fits with the current collector 4. The die-cutting device 6 is set to cut the polygonal electrode structure. The cut electrode structure is as follows Figure 5 In a specific implementation, the pole ears 20 in the polygonal pole piece are symmetrically arranged along the circumference of the polygonal pole piece structure, which is beneficial to the preparation of the laminated prismatic battery.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pole piece forming roller assembly, characterized in that: comprising a first roller and a second roller arranged opposite to each other; The roller surface of the first roller shaft is provided with a convex portion convex outwardly along the radial direction thereof, and the roller surface of the second roller shaft is provided with a concave portion concave inwardly along the radial direction thereof, and in the unfolded view of the outer circumference of the first roller shaft and the second roller shaft, the contours of the convex portion and the concave portion both have a plurality of edges connected end to end; The protrusion and the recess are arranged correspondingly, and when the first roller and the second roller rotate synchronously in opposite directions, the protrusion can be located in the recess, and a receiving cavity for receiving electrode material is formed between the protrusion and the recess.

2. The pole piece forming roller assembly according to claim 1, characterized in that: In a development view of the outer circumferential surfaces of the first roller and the second roller, the contour shapes of the protrusion and the recess are regular polygons.

3. The pole piece forming roller assembly according to claim 1, characterized in that: Among the multiple edges in the contours of the protruding portion and the recessed portion, two adjacent edges are connected by arc transition.

4. The pole piece forming roller assembly according to claim 1, characterized in that: The protrusions are multiple and spaced apart from each other along the axial direction of the first roller shaft; The recessed portions are multiple and spaced apart from each other along the axial direction of the second roller shaft, and the multiple protrusions correspond to the multiple recessed portions one by one.

5. The pole piece forming roller assembly according to claim 1, characterized in that: The surface roughness of the protrusion is greater than the surface roughness of the recess.

6. The pole piece forming roller assembly according to any one of claims 1 to 5, characterized in that: The distance between the first roller and the second roller is adjustable.

7. A pole piece processing equipment, characterized in that: The electrode processing equipment comprises a material extrusion device for outputting the electrode material, and a pole piece forming roller assembly according to any one of claims 1 to 6; The electrode piece forming roller assembly is located downstream of the material extrusion device and can receive the electrode material from the material extrusion device.

8. The pole piece processing equipment according to claim 7, characterized in that: The material extrusion device and the pole piece forming roller assembly are both in two groups, the first rollers in the two groups of the pole piece forming roller assemblies are arranged opposite to each other, and a gap is formed between the two first rollers for the current collector to pass through; Under the synchronous counter-rotation of the two first rollers, the electrode materials on the protrusions on both sides can be pre-attached to both sides of the current collector.

9. The pole piece processing equipment according to claim 8, characterized in that: The pole piece processing equipment also includes a pair of hot pressing rollers located downstream of the two groups of pole piece forming roller assemblies, and the pair of hot pressing rollers are used to press the current collector and the electrode materials on both sides together.

10. The pole piece processing equipment according to claim 9, characterized in that: The pole piece processing equipment also includes a die-cutting device located downstream of the hot pressing roller.

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