Dry-method pole piece preparation device
By combining a rotating roll system with an adjustable mold, the problems of structural uniformity and edge damage in dry electrode preparation are solved, achieving uniform electrode thickness and efficient material utilization, and adapting to the needs of discontinuous coating.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-03-27
AI Technical Summary
In existing dry electrode preparation processes, the electrode structure is too simple, there are defects in edge morphology control and potential risks to interface stability, making it difficult to meet the needs of discontinuous coating. In addition, the slitting process increases equipment investment and material damage.
It employs rotatable upper and lower rollers, equipped with adjustable protruding and concave dies, and forms a stable and dense structure through dynamic pressing, eliminating mechanical damage to the material caused by the slitting process and constructing a complete mechanical support network.
It achieves uniform control of electrode thickness, adapts to discontinuous coating processes, reduces material loss, improves production economy, and avoids active material shedding.
Smart Images
Figure CN224044665U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to dry method electrode technical field, concretely relates to a preparation device of dry method pole piece. BACKGROUND
[0002] In the prior art of dry method electrode, the following key bottlenecks exist in the raw material mixing and pole piece forming link: (1) single pole piece structure problem, the current preparation process relies on continuous roll compounding technology, and the pole piece is directly pressed from mixed solid powder, which can realize continuous production, but due to the limitation of equipment design principle, the interval distribution of coating area and blank area cannot be flexibly adjusted, resulting in that the pole piece structure presents a single continuous form, and it is difficult to adapt to special battery design scenarios with the demand of non-continuous coating. (2) edge form control defect, during the hot pressing forming process of the self-supporting film, due to the uneven degree of material fiberization, roll pressure distribution fluctuation and other factors, edge burrs or thickness deviation are prone to occur. In order to meet the requirements of subsequent processes, an additional slitting process is required to cut and trim the edge of the pole piece. This process not only increases equipment investment and energy consumption, but also causes damage to the interface of active material and conductive agent due to mechanical impact of the slitting tool, and destroys the integrity of the electrode microstructure. (3) interface stability hidden danger, the edge area of the pole piece after slitting is broken or the adhesive fails due to mechanical stress, and the original three-dimensional conductive network and adhesive system are damaged. Without remolding the edge structure through secondary forming process, the damaged area is prone to active material peeling off during electrolyte infiltration or charge-discharge cycle, and then local internal resistance rises or capacity decays. SUMMARY
[0003] The utility model aims at providing a preparation device of dry method pole piece, which solves the above problems through the setting of the preparation device.
[0004] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is:
[0005] A preparation device of dry method pole piece, comprising: a rotatable upper roller, a rotatable lower roller and a feeding mechanism; the roller body of the upper roller is provided with a convex mold; the roller body of the lower roller is provided with a concave mold, the concave mold is matched with the convex mold of the upper roller, so that the convex mold can be embedded in the concave mold to extrude the powder in the concave mold; the lower roller is arranged below the upper roller, when the concave mold on the lower roller rotates to the highest point and the convex mold of the upper roller rotates to the lowest point, the convex mold is embedded in the concave mold; the feeding mechanism is used to add powder to the concave mold of the lower roller.
[0006] To optimize the above technical scheme, the specific measures taken also include:
[0007] The lower roller is provided with a current collector below, and when the concave die of the lower roller rotates downward to the lower point, the position of the concave die corresponds to above the upper surface of the current collector.
[0008] At least one of the convex surface of the convex die and the concave bottom surface of the concave die is a telescopic structure, and the gap between the convex surface of the convex die and the bottom surface of the concave die can be changed by adjusting the telescopic degree when the convex die is embedded in the concave die for powder extrusion.
[0009] The feeding mechanism is arranged on the side surface between the upper roller and the lower roller.
[0010] Further, the feeding mechanism comprises a feeding support mechanism and a plurality of feeding nozzles distributed on the feeding support mechanism, and the tail end of the feeding nozzle corresponds to the position of the concave die rotating upward to the obliquely upward direction.
[0011] The convex surface of the convex die is surrounded by a smooth and neat outer side wall, and the concave bottom surface of the concave die is surrounded by a smooth and neat inner side wall.
[0012] Further, the convex die is embedded in the concave die, and the inner side wall around the concave bottom surface of the concave die is tightly attached to the outer side wall around the convex surface of the convex die.
[0013] Further, the lower roller is provided with a heating device, and the heating device is used for heating the concave die and the powder in the concave die.
[0014] The convex die is a retractable first movable block, and the first movable block is flush with the roller body of the upper roller when retracted.
[0015] The bottom of the concave die is provided with a second movable block which can be popped out, and the second movable block is flush with the roller body of the lower roller when popped out.
[0016] Compared with the prior art, the beneficial effects of the present application are:
[0017] The present application optimizes the pressing process and the equipment structure design, realizes efficient and high-quality self-supporting film dry method tab preparation, and the core is that the roller system is used for uniformly pressing the tab, so that the powder forms a stable and dense structure in a specific space, and the thickness fluctuation of the tab is effectively controlled.
[0018] The present application solves the process problem of non-continuous coating in special application scenarios, realizes continuous preparation of intermittent tabs through dynamic pressing of each stage of action during rotation of the device, and breaks through the rigid limitation of traditional process on the shape of the tab.
[0019] The utility model discloses still in the self -supporting film forming process, through the control to the side periphery end surface, strengthen the effect to dry powder sheet material edge area, eliminate the mechanical damage of slitting procedure to material structure simultaneously, construct complete mechanical support network, radically solve the active material drop problem of pole piece in the electrolyte infiltration or charging and discharging process because of the edge stress concentration.
[0020] The roller die has the characteristics of customization, can flexibly adapt to the size requirements of pole pieces of different specifications, simplifies the traditional multi-pass processing process, reduces material loss and equipment debugging cost, and improves production economy. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 : Structure diagram of upper roller and lower roller.
[0022] Figure 2 : Structure diagram of upper roller, lower roller, feeding mechanism and current collector.
[0023] Figure 3 : Structure diagram of feeding mechanism.
[0024] Figure 4 : Structure diagram of convex die and concave die.
[0025] In the figure: 1-upper roller, 2-lower roller, 3-feeding mechanism, 4-convex die, 5-concave die, 6-feeding support mechanism, 7-feeding nozzle, 8-current collector, 9-material slot, 10-first movable block, 11-second movable block. DETAILED DESCRIPTION
[0026] The above contents of the utility model will be further explained in detail in the form of examples, but this should not be understood as the scope of the above subject matter of the utility model is limited to the following examples. Any technology realized based on the above contents of the utility model belongs to the scope of the utility model.
[0027] In the description of the utility model, it should also be pointed out that:
[0028] The orientation or positional relationship therein is based on the relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or component must have a specific orientation, structure and operation, so it cannot be understood as a limitation of the utility model.
[0029] In addition, the terms such as "first, second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.
[0030] The present application is described in detail below with reference to the accompanying drawings:
[0031] The utility model provides a kind of preparation device of dry method pole piece, as shown in Figure 1 It includes: rotatable upper roller 1, rotatable lower roller 2 and feeding mechanism 3;Upper roller 1 is equipped with convex mold 4 on the roller body;Lower roller 2 is equipped with concave mold 5 on the roller body, and concave mold 5 is matched with the convex mold 4 of upper roller 1, so that convex mold 4 can be embedded in concave mold 5, and the powder in concave mold 5 is extruded;Lower roller 2 is arranged below upper roller 1, and when concave mold 5 on lower roller 2 rotates upward to the high point and convex mold 4 of upper roller 1 rotates downward to the low point, convex mold 4 is embedded in concave mold 5;Feeding mechanism 3 is used to add powder to concave mold 5 of lower roller 2.
[0032] At least one of the convex surface of convex mold 4 and the concave bottom surface of concave mold 5 is a telescopic structure, which can change the gap between the convex surface of convex mold 4 and the bottom surface of concave mold 5 when convex mold 4 is embedded in concave mold 5 for powder extrusion by adjusting the telescopic degree. Thus, the thickness of the powder sheet to be pressed can be matched, and correspondingly, if the thickness of the powder sheet to be pressed is thicker, the amount of powder added to each concave mold 5 can be increased by adjusting the amount of powder added by feeding mechanism 3.
[0033] Feeding mechanism 3 is arranged on the side surface between upper roller 1 and lower roller 2.
[0034] In some embodiments, as shown in Figure 3 Feeding mechanism 3 includes feeding support mechanism 6 and several feeding nozzles 7 distributed on feeding support mechanism 6, and feeding nozzles 7 are connected to powder chute 9 on feeding support mechanism 6;The end of feeding nozzle 7 corresponds to the position of concave mold 5 rotating upward to the obliquely upward direction. The uniform distribution of feeding nozzles 7 on feeding support mechanism 6 is beneficial to the uniformity of the sheet during pressing.
[0035] When the device is in use, lower roller 2 drives concave mold 5 to rotate upward to the obliquely upward direction, feeding nozzle 7 of feeding mechanism 3 adds the mixed powder into concave mold 5, lower roller 2 continues to drive concave mold 5 to rotate upward to the high point, at the same time, convex mold 4 of upper roller 1 rotates downward to the low point synchronously, and convex mold 4 is embedded in concave mold 5, forming an extrusion action, so that the powder is compacted, and convex mold 4 and concave mold 5 continue to rotate to separate, lower roller 2 drives concave mold 5 to rotate downward to the low point, and the extruded dry powder material in concave mold 5 of lower roller 2 falls down. In some embodiments, a flow collector 8 can be arranged below lower roller 2, as shown in Figure 2As shown, when the concave die 5 of the lower roller 2 rotates downward to the lower point, the position of the concave die 5 corresponds to above the upper surface of the current collector 8, and the dry powder material extruded in the concave die 5 falls on the current collector 8.
[0036] Preferably, the convex die 4 has a smooth and neat outer side wall around the convex surface, and the concave die 5 has a smooth and neat inner side wall around the concave bottom surface. The convex die 4 is embedded in the concave die 5, and the inner side wall around the concave bottom surface of the concave die 5 tightly fits the outer side wall around the convex surface of the convex die 4.
[0037] This arrangement can ensure that the side end of the extruded dry powder material also has a pressing effect, and form a neat side surface, avoiding the situation of powder falling off the pole piece.
[0038] In some embodiments, the lower roller 2 is provided with a heating device for heating the concave die 5 and the powder material therein.
[0039] In some embodiments, the convex die 4 is a retractable first movable block 10, which is flush with the roller body of the upper roller 1 when retracted. The bottom of the concave die 5 has a second movable block 11 which can be popped out, and is flush with the roller body of the lower roller 2 when popped out, as shown in Figure 4 .
[0040] The retractable design of the convex die 4 can retract the first movable block 10 of the convex die 4 after the extrusion action is completed, and plays a role in making the action more smooth for the embedding and separation of the convex die 4 and the concave die 5.
[0041] The pop-out design of the concave die 5 plays a boosting role when the extruded dry powder material is about to be transferred to the current collector 8, so that the dry powder material is more quickly and completely transferred to the current collector 8.
[0042] The retractable and pop-out structure design of the first movable block 10 and the second movable block 11 can refer to the prior art.
[0043] The roller body of the upper roller 1 can be provided with a plurality of convex dies 4, and the roller body of the lower roller 2 can be provided with a plurality of concave dies 5. Each convex die 4 and concave die 5 corresponds in the rotating process and performs the action in each stage, respectively, to improve the preparation efficiency of the dry powder electrode. The current collector 8 below can also be arranged on a forwardly moving conveying belt, and the moving speed of the conveying belt is set to match the formation speed of the dry powder material.
[0044] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Any modification, equivalent replacement, and improvement of the above embodiments made by any person skilled in the art, without departing from the technical scope of the present application, shall fall within the protection scope of the present application.
Claims
1. An apparatus for preparing a dry electrode sheet, characterized by comprising: The application relates to a rotary roller mill, which comprises a rotatable upper roller, a rotatable lower roller and a feeding mechanism. The feeding mechanism is used for adding powder into the concave die of the lower roller. The lower roller is provided with a current collector below, and when the concave die of the lower roller rotates to the lower point, the position of the concave die corresponds to the upper surface of the current collector.
2. The apparatus for preparing a dry electrode plate according to claim 1, characterized by: At least one of the convex surface of the convex die and the concave bottom surface of the concave die is a telescopic structure, and the gap between the convex surface of the convex die and the concave bottom surface of the concave die can be changed by adjusting the telescopic degree when the convex die is embedded into the concave die to extrude the powder.
3. The apparatus for preparing a dry electrode plate according to claim 1, characterized by: The feeding mechanism is arranged on the side surface between the upper roller and the lower roller.
4. The apparatus for making a dry electrode plate of claim 1, wherein: The feeding mechanism comprises a feeding support mechanism and a plurality of feeding nozzles distributed on the feeding support mechanism, and the tail end of the feeding nozzle corresponds to the position of the concave die which rotates to the obliquely upward direction.
5. The apparatus for preparing a dry electrode plate according to claim 4, characterized by: The convex surface of the convex die is surrounded by a smooth and neat outer peripheral wall, and the concave bottom surface of the concave die is surrounded by a smooth and neat inner peripheral wall.
6. The apparatus of claim 1, wherein: When the convex die is embedded into the concave die, the inner peripheral wall of the concave bottom surface of the concave die is tightly combined with the outer peripheral wall of the convex surface of the convex die.
7. The apparatus for preparing a dry electrode plate according to claim 6, characterized by: The lower roller is provided with a heating device, and the heating device is used for heating the concave die and the powder in the concave die.
8. The apparatus of claim 1, wherein: The convex die is a retractable first movable block, and the first movable block is flush with the roller body of the upper roller when the first movable block is retracted.
9. The apparatus of claim 1, wherein: The concave die is provided with a second movable block which can be popped out, and the second movable block is flush with the roller body of the lower roller when the second movable block is popped out.
10. The apparatus of claim 1, wherein: