Pole piece winding drum structure and unwinding device

Abstract

The utility model discloses an electrode sheet winding drum structure, including winding drum, winding assembly and base tape, winding drum inside is provided with winding assembly, and winding drum is set up winding through -hole along its axial direction, and the one end of base tape is wound on winding assembly, and the other end is through winding through -hole and extends winding drum. The utility model discloses still a kind of including the unwinding device of electrode sheet winding drum structure. The utility model has the advantages that, through winding drum inside is provided with the winding assembly of winding base tape, not only make after electrode sheet completely separates from winding drum, base tape will continue to follow electrode sheet and unwind, through base tape replaces the residual electrode sheet on winding drum, can maximum degree realize the utilization of electrode sheet, also due to the fixation of winding assembly to base tape, make base tape not scatter under the high -speed rotation state of winding drum, can be applied to automatic cutting volume change volume and artificial cutting volume change volume equipment, and applicability is wider.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an electrode roll structure and an unwinding device. Background Technology

[0002] In lithium battery production, the positive and negative electrode sheets are transported in the form of electrode rolls during the electrode process. This means the electrode sheets are wound around the surface of the roll. Due to the structural characteristics of the equipment, after each process, 2-5 meters of electrode sheets typically remain on the roll surface and need to be scrapped, increasing manufacturing waste. For example, Chinese invention patent document CN111320005A discloses a baseband roll, an unwinding and changing device, and an unwinding method. The baseband roll includes a roll and a baseband, with the baseband wound around the roll. The baseband includes a first connecting end and a second connecting end; the first connecting end is connected to the roll, and the second connecting end is used to connect to the substrate. This disclosed baseband roll, by winding the baseband around the roll and connecting the substrate to the baseband, ensures that even after the substrate is completely detached from the roll, some baseband remains wound around it. Compared to existing technologies that require a certain amount of substrate to remain on the roll, this baseband replaces the substrate remaining on the roll, maximizing the utilization of the substrate.

[0003] While the aforementioned patents have solved the problem of residual electrode sheets on the rolls of manual roll-changing equipment, they cannot be effectively used for automatic roll-changing equipment that does not require continuous operation. This is because the base strip on the surface of the roll is not fixed, and without external force to fix the base strip, it is easy to spread out. Its application is limited, and it is mainly used for the transfer of electrode rolls between the rolling, slitting and winding processes in lithium battery production. It is not suitable for automatic roll-changing and manual roll-changing equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is how to improve the applicability of the roll structure.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] An electrode roll structure includes a roll, a winding assembly, and a base strip. The winding assembly is provided inside the roll, and the roll has a winding through hole along its axial direction. One end of the base strip is wound on the winding assembly, and the other end passes through the winding through hole and extends out of the roll.

[0007] By incorporating a take-up assembly with a baseband inside the drum, the baseband continues to unwind after the electrode is completely detached from the drum, replacing the residual electrode on the drum and maximizing electrode utilization. Furthermore, the baseband is secured by the take-up assembly, preventing it from unraveling during high-speed drum rotation. This design allows for applications in both automatic and manual cut-and-change equipment, making it widely applicable.

[0008] Preferably, the two ends of the drum are air-expansion shaft clamping areas, the middle part is the electrode winding area, and the winding through hole is set in the electrode winding area.

[0009] Preferably, the winding assembly includes a winding seat and a winding mechanism. The winding seat is fixed to the inner wall of the drum, and the winding mechanism is provided on the winding seat. One end of the base tape is wound on the winding mechanism, and the other end extends out of the winding seat and passes through the winding through hole.

[0010] Preferably, the winding mechanism is a spring winding mechanism or an electric winding mechanism.

[0011] Preferably, an adhesive strip is provided at the end of the base tape extending from the roll.

[0012] Preferably, a groove is provided on the outer wall of the roll near the take-up through hole along the length of the adhesive strip.

[0013] The groove design allows the adhesive strip to be embedded in the groove. After the adhesive strip is connected to the electrode, there is no height difference between the adhesive strip and the outer wall of the roll, ensuring that the electrode can be wound flat on the roll.

[0014] This utility model also provides an unwinding device, including the above-mentioned electrode roll structure, an unwinding drive device, and an air shaft. The output end of the unwinding drive device is provided with an air shaft, and both ends of the roll are fixed on the air shaft.

[0015] Preferably, the unwinding device further includes a first sensor, which is positioned near the drum to detect the baseband.

[0016] Preferably, the unwinding device further includes a tape-joining device, through which the electrode sheet detached from the drum passes.

[0017] Preferably, the unwinding device further includes a second sensor, which is positioned close to the tape splicing device for detecting the baseband. Compared with the prior art, the advantages of this utility model are:

[0018] By incorporating a take-up assembly with a baseband inside the drum, the baseband continues to unwind after the electrode is completely detached from the drum, replacing the residual electrode on the drum and maximizing electrode utilization. Furthermore, the baseband is secured by the take-up assembly, preventing it from unraveling during high-speed drum rotation. This design allows for applications in both automatic and manual cut-and-change equipment, making it widely applicable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the unwinding device according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the electrode roll structure according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the roll according to an embodiment of the present invention.

[0022] In the figure: 1. Roll drum; 101. Rewinding through hole; 2. Rewinding assembly; 21. Rewinding seat; 22. Rewinding mechanism; 3. Base tape; 4. Adhesive strip; 5. Electrode; 6. Unwinding drive device; 7. Air shaft; 8. Tape splicing device; 9. First sensor; 10. Second sensor. Detailed Implementation

[0023] To facilitate understanding of the technical solution of this utility model by those skilled in the art, the technical solution of this utility model will now be further described in conjunction with the accompanying drawings.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited.

[0026] See Figure 1 and Figure 2 This embodiment discloses an electrode roll structure, including a roll 1, a winding assembly 2, and a baseband 3.

[0027] See Figure 3 The two ends of the drum 1 are air-expansion shaft clamping areas, and the middle part is the electrode winding area. A winding through hole 101 is provided in the electrode winding area along the axial direction of the drum 1.

[0028] See Figure 2 The winding assembly 2 includes a winding seat 21 and a winding mechanism 22. The winding seat 21 is fixed on the inner wall of the winding area of ​​the electrode of the drum 1. The winding seat 21 is provided with the winding mechanism 22, which is a spring winding mechanism or an electric winding mechanism. Both the spring winding mechanism and the electric winding mechanism can be purchased on the market.

[0029] One end of the baseband 3 is wound on the winding mechanism 22, and the other end extends out of the winding seat 21 and passes through the winding through hole 101 before extending out of the drum 1 and connecting with the electrode 5 wound on the drum 1.

[0030] An adhesive strip 4 is provided at the end of the base strip 3 extending from the roll 1 for bonding the electrode 5. A groove (not shown in the figure) is provided on the outer wall of the roll 1 near the take-up through hole 101 along the length of the adhesive strip 4. The adhesive strip 4 can be embedded in the groove, so that there is no height difference between the adhesive strip 4 and the outer wall of the roll 1 after the adhesive strip 4 is connected to the electrode 5, ensuring that the electrode 5 can be wound flat on the roll 1. In this embodiment, the adhesive strip 4 is an adhesive tape, and the width of the adhesive tape is greater than the width of the take-up through hole 101, ensuring that the adhesive strip 4 will not extend into the inside of the roll 1 from the take-up through hole 101, facilitating the connection between the adhesive strip 4 and the electrode 5.

[0031] See Figure 1 This embodiment also provides an unwinding device, including the above-mentioned electrode roll structure, an unwinding drive device 6, an air shaft 7, a tape-connecting device 8, a first sensor 9, and a second sensor 10. The output end of the unwinding drive device 6 is provided with an air shaft 7. The air shaft clamping areas at both ends of the roll 1 are fixed on the air shaft 7. The electrode 5 detached from the roll 1 passes through the tape-connecting device 8. A first sensor 9 and a second sensor 10 for detecting the baseband are provided between the roll 1 and the tape-connecting device 8, wherein the first sensor 9 is located close to the roll 1 and the second sensor 10 is located close to the tape-connecting device 8.

[0032] Specifically, the working principle of the unwinding device is as follows: the drum 1 with the electrode sheet 5 wound on the air shaft 7 is then driven by the unwinding drive device 6 to rotate the drum 1 and unwind the electrode sheet 5. The electrode sheet detached from the drum 1 passes through the tape splicing device 8 and connects to the external roller pressing and splicing platform. The unwinding drive device 6 continues to operate. When the first sensor 9 detects the base tape 3, the unwinding drive device 6 stops driving, and the winding mechanism 22 inside the drum 1 starts to drive. During the continuous unwinding of the electrode sheet 5, the base tape 3 is driven to extend out of the winding through hole 101 and continue to unwind. When the second sensor 10 detects the base tape 3, the external roller pressing and splicing platform stops operating. Then, the electrode sheet 5 is cut or torn from the adhesive strip 4 at the end of the base tape 3. The unwinding of the electrode sheet 5 is completed, and the base tape 3 is automatically recycled to the winding mechanism 22.

[0033] In summary, this embodiment, by providing a winding assembly 2 inside the drum 1 to wind the base tape 3, not only ensures that the base tape 3 continues to unwind after the electrode 5 is completely detached from the drum 1, thus replacing the residual electrode 5 on the drum 1 and maximizing the utilization of the electrode 5, but also prevents the base tape 3 from unwinding when the drum 1 is rotating at high speed due to the fixing of the base tape 3 by the winding assembly 2. This makes it applicable to both automatic and manual winding and changing equipment, and has a wide range of applications.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] The above-described embodiments are merely examples of implementation methods of the utility model. The scope of protection of this utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model.

Claims

1. An electrode roll structure, characterized in that: It includes a drum, a take-up assembly, and a base tape. The take-up assembly is installed inside the drum. The drum has a take-up through hole along its axial direction. One end of the base tape is wound on the take-up assembly, and the other end passes through the take-up through hole and extends out of the drum.

2. The electrode roll structure according to claim 1, characterized in that: The two ends of the drum are the air-expansion shaft clamping area, the middle part is the electrode winding area, and the winding through hole is set in the electrode winding area.

3. The electrode roll structure according to claim 1, characterized in that: The winding assembly includes a winding seat and a winding mechanism. The winding seat is fixed to the inner wall of the drum, and the winding mechanism is provided on the winding seat. One end of the base tape is wound on the winding mechanism, and the other end extends out of the winding seat and passes through the winding through hole.

4. The electrode roll structure according to claim 3, characterized in that: The winding mechanism is either a spring winding mechanism or an electric winding mechanism.

5. The electrode roll structure according to claim 1, characterized in that: An adhesive strip is provided at the end of the base tape extending from the roll.

6. The electrode roll structure according to claim 5, characterized in that: The outer wall of the roll near the take-up through hole has a groove along the length of the adhesive strip.

7. An unwinding device, characterized in that: The device includes the electrode roll structure as described in any one of claims 1 to 6, as well as the unwinding drive device and the air shaft. The output end of the unwinding drive device is provided with the air shaft, and both ends of the roll are fixed on the air shaft.

8. The unwinding device according to claim 7, characterized in that: It also includes a first sensor, which is positioned near the reel to detect the baseband.

9. The unwinding device according to claim 7, characterized in that: It also includes a tape-connecting device, which connects the electrode sheet that has detached from the drum.

10. The unwinding device according to claim 9, characterized in that: It also includes a second sensor, which is positioned near the junction device to detect the baseband.

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