Composite roll for preventing strip breakage by edge rolling

Abstract

The utility model relates to a kind of composite rolls for preventing pole piece roll press broken belt of pole roll, set before pole piece roll press, including the main body roll for bearing the coating area of the pole piece of several and the radius adjustable auxiliary roll for bearing the empty foil area of the pole piece of several;Several The main body roll and several The auxiliary roll are alternately connected.This utility model connects auxiliary roll and main body roll together as tensioning roll, realize the adjustment of the tensioning force of the multiple empty foil areas on pole piece, to avoid pole piece in thinning compaction (that is, press roll) broken belt.Auxiliary roll and main body roll can be disassembled design is to change the length of main body roll, and then adapt the pole piece of different coating area width.

Description

Technical Field

[0001] This utility model relates to the field of electrode rolling technology, and in particular to a composite roller that prevents electrode rolls from breaking the strip. Background Technology

[0002] Electrodes are rolled up in a coil. The electrode mainly consists of a current collector foil and an active material layer coated on the foil. To produce this type of electrode, the active material is coated onto the foil, and then the electrode is rolled to thin and compact the active material layer, achieving the desired thickness or density.

[0003] Typically, there are empty foil areas on the foil material. These empty foil areas are not coated with the active material layer, mainly to facilitate the cutting of electrode tabs in subsequent processes. When the electrode sheet is rolled and pressed, the thickness of the empty foil area and the coated area are different, resulting in different stresses on the empty foil area and the coated area. This makes the empty foil area of ​​the electrode sheet prone to breakage, which can also cause problems for subsequent processes such as slitting and winding.

[0004] To address the aforementioned problems, patent application number "201820803912.6" entitled "An Electrode Roller Pressing Device" discloses a technical solution. This solution uses tension adjusting rollers with different radii to regulate the tension of the empty foil area of ​​the electrode, thus preventing breakage in the blank area. Therefore, composite rollers with different radii serve as tension adjusting rollers to regulate the tension of the empty foil area of ​​the electrode. However, in this technical solution, the composite rollers cannot adjust their radius, resulting in limited adaptability and practicality.

[0005] In addition, patent application number "202222736695.2" entitled "A Stretching Roller" discloses another technical solution, which achieves roller radius adjustment by setting expandable structures at both ends of the main steel roller. However, since the expansion structure in this technical solution is set on the main shaft, it can only be adapted to electrode sheets with empty foil areas at the edges.

[0006] To address the problems of the two aforementioned technical solutions, this invention proposes a composite roller to prevent the electrode roll from breaking the strip, in order to adapt to electrode sheets with multi-hole foil areas and active material coatings of different widths. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model discloses a composite roller to prevent the belt from breaking under the pressure of the polarity roller. The technical solution of this utility model is implemented as follows:

[0008] A composite roller for preventing the electrode roll from breaking the strip is disposed before the electrode roll and includes several main rollers for carrying the coating area of ​​the electrode and several auxiliary rollers with adjustable radius for carrying the empty foil area of ​​the electrode.

[0009] Several main rollers and several auxiliary rollers are alternately connected.

[0010] Preferably, the auxiliary roller includes an air-expanding shaft and a rubber layer;

[0011] The adhesive layer is fitted onto the air shaft;

[0012] The air shaft and the main roller are provided with a through first air passage, and the air shaft is sealed to the main roller.

[0013] Preferably, the main roller includes a main air shaft and a main adhesive layer; the main adhesive layer is sleeved on the main air shaft.

[0014] Preferably, the main roller is made of stainless steel.

[0015] Preferably, at least one of the auxiliary roller and the main roller is provided with a threaded connector, and the auxiliary roller or main roller adjacent to the auxiliary roller or main roller provided with the threaded connector is provided with an internal thread that mates with the threaded connector.

[0016] Preferably, the threaded connector is provided with a protrusion, and a sealing sleeve is provided on the protrusion;

[0017] The internal thread is provided with a clearance portion;

[0018] The protrusion and the clearance portion are sealed together by the sealing sleeve.

[0019] Preferably, both the air shaft and the main air shaft include a shaft body, a telescopic rod, and several push plates;

[0020] A plurality of push plates are disposed around the shaft, and the telescopic rod is connected between the push plates and the shaft and is perpendicular to the first air passage;

[0021] The shaft body is provided with a second air passage corresponding to the telescopic rod. The second air passage is connected to the first air passage, and the second air passage is provided with gas for driving the telescopic rod to extend and retract.

[0022] Preferably, the telescopic rod includes a sleeve and a sliding rod;

[0023] One end of the tube sleeve is sealed to the second air passage, and the slide rod is inserted from the other end of the tube sleeve; a sealing plug is provided at one end of the slide rod that extends into the tube sleeve, and the other end of the slide rod is connected to the push plate.

[0024] The sealing plug is in a sealed fit with the inner wall of the sleeve.

[0025] Preferably, each of the second air passages is provided with a controllable air valve.

[0026] This invention uses several rollers of different radii (sub-rollers and main rollers) alternately connected together as tension rollers to adjust the tension in multiple empty foil areas on the electrode sheet, thus preventing the electrode sheet from breaking during thinning and pressing (i.e., pressure roller breakage). Furthermore, by introducing different amounts of air into the air expansion shaft of the sub-rollers, the radius of the air expansion shaft can be adjusted, thereby changing the radius difference between the sub-rollers and the main rollers, and thus matching electrode sheets with different coating thicknesses.

[0027] The detachable auxiliary roller and main roller are designed to change the length of the main roller, thereby adapting to electrode sheets with different coating area widths.

[0028] As a preferred embodiment, this invention further improves the adaptability of the composite roller by setting both the auxiliary roller and the main roller as rubber rollers with adjustable radii. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0031] Figure 1 This is a schematic diagram of a composite roller embodiment for preventing belt breakage by the polar roll. As the drawing that best illustrates the technical features of this utility model, this drawing is also designated as the abstract drawing of this utility model.

[0032] Figure 2 A diagram illustrating the usage state of a composite roll embodiment for preventing strip breakage by electrode roll pressing during electrode roll pressing;

[0033] Figure 3 A cross-sectional view of the auxiliary roller and the main roller in an embodiment of a composite roller for preventing the polarity roller from breaking the belt;

[0034] Figure 4 In another embodiment of a composite roll to prevent the polar roll from breaking the belt, a structural diagram showing the positional relationship between the first air passage and the second air passage is provided.

[0035] Figure 5for Figure 4 Enlarged cross-sectional view of the telescopic rod structure in the diagram;

[0036] Figure 6 This is a partial cross-sectional view of the main roller or auxiliary roller in another embodiment of the composite roller for preventing the electrode roll from breaking the strip. It should be noted that in this embodiment, the main roller and auxiliary roller adopt the same air expansion shaft structure. By introducing different amounts of gas into adjacent main rollers and auxiliary rollers, the two have a radius difference, thereby completing the adaptation of the composite roller to the electrode roll pressure.

[0037] In the above figures, the symbols used for each figure are as follows:

[0038] 1. Composite roller;

[0039] 1-1, Main roller;

[0040] 1-1-1, the yielding part;

[0041] 1-2, auxiliary roller;

[0042] 1-2-1, air-expanding shaft;

[0043] 1-2-1-1, Shaft;

[0044] 1-2-1-1-1, Second airway;

[0045] 1-2-1-2, Telescopic pole;

[0046] 1-2-1-2-1, sliding rod;

[0047] 1-2-1-2-2, Pipe sleeve;

[0048] 1-2-1-2-3, sealing plug;

[0049] 1-2-1-3, push plate;

[0050] 1-2-2, Adhesive layer;

[0051] 1-2-3, Threaded connector;

[0052] 1-2-3-1, Protrusion;

[0053] 1-3, First airway;

[0054] 2. First unwinding roller;

[0055] 3. Second unwinding roller;

[0056] 4. First pressure roller;

[0057] 5. Second pressure roller;

[0058] 6. Take-up roller. Detailed Implementation

[0059] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0060] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the detailed description is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having” and any variations thereof in the specification, claims and foregoing description of the invention are intended to cover non-exclusive inclusion.

[0061] In the description of the specific embodiments of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0062] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0063] In the description of this utility model embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this utility model, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0064] The embodiments of the present invention will be described in more detail below through examples. It should be noted that the embodiments of the present invention are not limited to these examples.

[0065] Example 1

[0066] In one specific embodiment, such as Figure 1As shown, a composite roller 1 is disposed before the electrode pressing; the composite roller 1 includes a plurality of alternating main rollers 1-1 and auxiliary rollers 1-2; the main rollers 1-1 are used to carry the coating area of ​​the electrode, and the auxiliary rollers 1-2 are used to carry the empty foil area of ​​the electrode. The radius of the auxiliary rollers 1-2 is adjustable. By adjusting the radius of the auxiliary rollers, the radius difference between the auxiliary rollers 1-2 and the main rollers 1-1 is changed so that it is the same as the thickness of the coating area of ​​the electrode to be pressed.

[0067] The specific application of this embodiment is as follows: Figure 2 As shown, the electrode rolling device includes an unwinding roller assembly, a first pressure roller 4, a composite roller 1, a second pressure roller 5, and a take-up roller 6 arranged in sequence.

[0068] The unwinding roller assembly includes a first unwinding roller 2 and a second unwinding roller 3 arranged vertically. The first unwinding roller 2 is used to unwind foil, and the second unwinding roller 3 is used to unwind active material films. Multiple second unwinding rollers 3 can be arranged side by side along their axis, so that multiple active material films and lithium foil enter the first pressure roller 4 together, forming multiple coating areas on the lithium foil.

[0069] The first pressure roller 4 combines the foil and the active material film together.

[0070] Composite roller 1 is used to adjust the tension of the electrode sheets.

[0071] The second pressure roller 5 presses and compacts the active material in the coating area of ​​the electrode sheet.

[0072] The take-up roller 6 is used to take up the electrode sheets after they have been rolled.

[0073] In this embodiment, by adjusting the radius of the auxiliary roller 1-2 to be larger than that of the main roller 1-1, the radius difference between the auxiliary roller 1-2 and the main roller 1-1 is equal to the thickness of the active material layer. The auxiliary roller 1-2 can support the empty foil area of ​​the electrode, while the main roller 1-1 can support the coating area of ​​the electrode. This allows the empty foil area to be subjected to a certain tension, enabling it to stretch along with the electrode, thus greatly reducing the occurrence of strip breakage. This embodiment achieves tension adjustment of the empty foil area of ​​the electrode with multiple empty foil areas by setting several alternately connected main rollers 1-1 and auxiliary rollers 1-2, thereby avoiding the problem of electrode breakage.

[0074] In this embodiment, the auxiliary roller 1-2 is detachably connected to the main roller 1-1. By replacing the main roller 1-1 with different shaft lengths, it can accommodate coating areas of different widths; similarly, by replacing the auxiliary roller 1-2 with different shaft lengths, it can accommodate empty foil areas of different widths. Furthermore, by increasing the number of sets of auxiliary roller 1-2 and main roller 1-1, it can accommodate electrode sheets of different widths. This embodiment improves the adaptability of the composite roller 1 by making the auxiliary roller 1-2 and main roller 1-1 detachably connected.

[0075] In this embodiment, the main roller 1-1 is made of stainless steel. It should be noted that this material is only an example and does not represent a limitation. In other embodiments, the main roller 1-1 can be composed of several detachably connected steel rollers. An appropriate number of steel rollers can be selected for assembly based on the width of the coating area on the electrode sheet, thereby improving the adaptability of the composite roller.

[0076] like Figure 3 As shown, the auxiliary roller 1-2 includes an air expansion shaft 1-2-1 and an adhesive layer 1-2-2; the adhesive layer 1-2-2 is fitted onto the air expansion shaft 1-2-1; the air expansion shaft 1-2-1 and the main roller 1-1 are provided with a through first air passage 1-3.

[0077] In practical applications, air is supplied from one end of the composite roller 1. The through-pass first air channel 1-3 allows the introduced gas to enter each air expansion shaft 1-2-1 to adjust the radius of the auxiliary roller 1-2. When pressure balance is achieved, each auxiliary roller 1-2 can be adjusted to the same radius, thereby ensuring the force balance of the empty foil areas on the electrode.

[0078] By introducing different amounts of gas into the first air passage 1-3, the pressure in each air expansion shaft 1-2-1 is changed. The difference in internal pressure will cause the air expansion shaft 1-2-1 to expand to different degrees. In this embodiment, the radius of the auxiliary roller 1-2 is changed in this way.

[0079] In some embodiments, at least one of the auxiliary roller 1-2 and the main roller 1-1 is provided with a threaded connector 1-2-3, and the main roller 1-1 or auxiliary roller 1-2 adjacent to the auxiliary roller 1-2 or the main roller 1-1 provided with the threaded connector 1-2-3 is provided with an internal thread that mates with the threaded connector 1-2-3.

[0080] In some preferred embodiments, the threaded connector 1-2-3 is provided with a protrusion 1-2-3-1, the protrusion 1-2-3-1 is provided with a sealing sleeve, and the internal thread is provided with a relief portion 1-1-1. The protrusion 1-2-3-1 and the relief portion 1-1-1 are sealed and connected by the sealing sleeve.

[0081] In this embodiment, one end of the auxiliary roller 1-2 is provided with a threaded connector 1-2-3, and the other end is provided with an internal thread; the main roller 1-1 is also provided with a threaded connector 1-2-3 at one end and an internal thread at the other end.

[0082] In a specific application, the connection between a secondary roller 1-2 and a main roller 1-1 is described as an example: the protrusion 1-2-3-1 on the air shaft 1-2-1 extends into the clearance portion 1-1-1 on the main roller 1-1. A sealing sleeve is fitted onto the protrusion 1-2-3-1. When the protrusion 1-2-3-1 extends into the clearance portion 1-1-1, the sealing sleeve abuts against the inner surface of the clearance portion 1-1-1, thereby achieving a sealed connection between the air shaft 1-2-1 and the main roller 1-1, preventing air leakage, and ensuring that the radii of each secondary roller 1-2 are consistent, thus ensuring the force balance of the empty foil areas on the electrode sheet.

[0083] In other embodiments, both ends of the auxiliary roller 1-2 are threaded connectors 1-2-3, and both ends of the main roller 1-1 are internal threads. The specific connection method between the threaded connectors 1-2-3 and the internal threads is the same as in this application, and will not be described in detail here.

[0084] In other embodiments, both ends of the auxiliary roller 1-2 are internally threaded, and both ends of the main roller 1-1 are threaded connectors 1-2-3. The specific connection method between the threaded connectors 1-2-3 and the internal threads is the same as in this application, and will not be described in detail here.

[0085] In some implementations, such as Figure 4 As shown, the air expansion shaft 1-2-1 includes a shaft body 1-2-1-1, a telescopic rod 1-2-1-2, and several push plates 1-2-1-3; wherein, a threaded connector 1-2-3, a protrusion 1-2-3-1, and an internal thread groove are provided on the shaft body 1-2-1-1. Several push plates 1-2-1-3 are arranged around the shaft body 1-2-1-1, and the telescopic rod 1-2-1-2 connects the push plates 1-2-1-3 to the shaft body 1-2-1-1. The shaft 1-2-1-1 is provided with a second air passage 1-2-1-1-1 corresponding to the telescopic rod 1-2-1-2. The first air passage 1-3 is connected to the second air passage 1-2-1-1-1. The second air passage 1-2-1-1 is used to receive the gas from the first air passage 1-3 to drive the telescopic rod 1-2-1-2 to extend and retract, thereby driving the push plate 1-2-1-3 to move and realize the adjustment of the radius of the auxiliary roller 1-2.

[0086] In some implementations, such as Figure 5As shown, the telescopic rod 1-2-1-2 includes a sliding rod 1-2-1-2-1 and a sleeve 1-2-1-2-2. One end of the sleeve 1-2-1-2-2 is sealed to the second air passage 1-2-1-1-1. The sliding rod 1-2-1-2-1 is inserted into the other end of the sleeve 1-2-1-2-2 and connected to a sealing plug 1-2-1-2-3. The sealing plug is sealed to the inner wall of the sleeve 1-2-1-2-2. When a pressure difference occurs on both sides of the sealing plug 1-2-1-2-3, the sealing plug 1-2-1-2-3 can move within the sleeve 1-2-1-2-2, causing the sliding rod 1-2-1-2-1 to move, thus realizing the extension and retraction of the telescopic rod 1-2-1-2.

[0087] Example 2

[0088] In a preferred embodiment 2, such as Figure 6 As shown, a composite roller 1 is positioned before the electrode rolling process. The composite roller 1 includes several alternately connected main rollers 1-1 and auxiliary rollers 1-2. The main rollers 1-1 are used to carry the coating area of ​​the electrode, and the auxiliary rollers 1-2 are used to carry the empty foil area of ​​the electrode. Unlike Embodiment 1, the main rollers 1-1 and auxiliary rollers 1-2 have similar structures in this embodiment. The main roller 1-1 includes a main air shaft and a main adhesive layer. The structure of the main air shaft is similar to that of the air shaft 1-2-1 in Embodiment 1, and the structure of the main adhesive layer is similar to that of the adhesive layer 1-2-2 in Embodiment 1. This design allows the radius of the main roller 1-1 to be adjusted. The composite roller 1 as a whole is composed of several rollers with adjustable radii (including the adjustable-radius main roller 1 and the adjustable-radius auxiliary roller 2).

[0089] In this embodiment, a controllable air valve is provided in each second air passage 1-2-1-1-1 to enable the connection and closure between the second air passage 1-2-1-1-1 and the first air passage 1-3, thereby achieving individual adjustment of the radius of the air expansion shaft 1-2-1 on each roller. It should be noted that controlling the gas flow in a specific gas passage individually using a controllable air valve is a conventional technique in the art, and this invention will not elaborate on it.

[0090] In practical applications, when it is necessary to adjust the tension of the empty foil area on the electrode using the composite roller 1, it is only necessary to adjust the air flow of the air expansion shaft 1-2-1 or the main air expansion shaft corresponding to the empty foil area to change the radius of the corresponding position of the composite roller 1. There is no need to disassemble the composite roller 1, replace the auxiliary roller 1-2 with the same shaft length as the width of the empty foil area and the main roller 1-1 with the same shaft length as the width of the coating area, and adjust the radius of the corresponding position of the empty foil area, making the composite roller 1 more adaptable.

[0091] It should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite roller for preventing strip breakage by electrode roll pressing, disposed before electrode roll pressing, characterized in that, It includes several main rollers for carrying the coating area of ​​the electrode sheet and several auxiliary rollers with adjustable radius for carrying the empty foil area of ​​the electrode sheet; Several main rollers and several auxiliary rollers are alternately connected.

2. The composite roller for preventing belt breakage by the electrode roll according to claim 1, characterized in that, The auxiliary roller includes an air-expanding shaft and a rubber layer; The adhesive layer is fitted onto the air shaft; The air shaft and the main roller are provided with a through first air passage, and the air shaft is sealed to the main roller.

3. The composite roller for preventing belt breakage by the pole roll according to claim 2, characterized in that, The main roller includes a main air shaft and a main adhesive layer; the main adhesive layer is sleeved on the main air shaft.

4. The composite roller for preventing belt breakage by the electrode roll according to claim 2, characterized in that, The main roller is made of stainless steel.

5. The composite roller for preventing belt breakage by the pole roll according to any one of claims 1-4, characterized in that, At least one of the auxiliary roller and the main roller is provided with a threaded connector, and the auxiliary roller or main roller adjacent to the auxiliary roller or main roller provided with the threaded connector is provided with an internal thread that mates with the threaded connector.

6. The composite roller for preventing belt breakage by the pole roll according to claim 5, characterized in that, The threaded connector is provided with a protrusion, and a sealing sleeve is provided on the protrusion; The internal thread is provided with a clearance portion; The protrusion and the clearance portion are sealed together by the sealing sleeve.

7. The composite roller for preventing belt breakage by the pole roll according to claim 3 or 4, characterized in that, Both the air expansion shaft and the main air expansion shaft include a shaft body, a telescopic rod, and several push plates; A plurality of push plates are disposed around the shaft, and the telescopic rod is disposed between the push plates and the shaft and perpendicular to the first air passage; The shaft body is provided with a second air passage corresponding to the telescopic rod. The second air passage is connected to the first air passage, and the second air passage is provided with gas for driving the telescopic rod to extend and retract.

8. The composite roller for preventing belt breakage by the pole roll according to claim 7, characterized in that, The telescopic rod includes a sleeve and a sliding rod; One end of the tube sleeve is sealed to the second air passage, and the slide rod is inserted from the other end of the tube sleeve; a sealing plug is provided at one end of the slide rod that extends into the tube sleeve, and the other end of the slide rod is connected to the push plate. The sealing plug is in a sealed fit with the inner wall of the sleeve.

9. The composite roller for preventing belt breakage by the pole roll according to claim 7, characterized in that, Each of the second airways is equipped with a controllable air valve.

Images