Diaphragm roll structure

Abstract

The utility model belongs to the technical field of battery diaphragm winding drum, concretely relates to a diaphragm winding drum structure, including winding drum body, adjusting wheel body, adjusting guide piece and at least one movable element, adjusting wheel body is connected to the winding drum body, adjusting guide piece is connected to the adjusting wheel body, and at least one limiting slot is equipped on the adjusting wheel body, one end of movable element is movably connected to the inside of the length direction of limiting slot, and the other end of movable element extends to the direction away from the adjusting wheel body and is arranged, the utility model can change the size of the outer ring of diaphragm winding drum structure quickly, and then is favorable to realize the release of diaphragm elastic stress under the circulation movement of movable element when diaphragm unwinds, to avoid the appearance of inner ring wrinkle of pole piece due to elastic stress retraction, so as to improve the quality of the battery cell produced.

Description

Technical Field

[0001] This utility model belongs to the field of battery separator roll technology, and particularly relates to a separator roll structure. Background Technology

[0002] With the rapid development of science and technology, human demand for portable electronic devices is increasing, leading to increasingly stringent requirements for the batteries used in them. As the core function of electronic devices, batteries directly impact the user's experience. In today's era of pursuing large and thin electronic devices, the size specifications of lithium batteries are becoming increasingly demanding. When batteries are produced to be large and thin, they are prone to deformation, which will seriously affect the performance of lithium-ion batteries. The separators used in lithium-ion battery production are generally polyolefin separators, which have strong elasticity. After the separator is cut, if the winding tension is too high, the separator will be in a taut state. When rolled into a core, especially a large and thin core, the separator itself is prone to strong shrinkage.

[0003] However, in the battery production process, the existing separator rolls used for winding batteries are fixed-size plastic structures. Before the cells are wound, the separator is cut and wound. The winding process tightens the separator, causing elastic stress. During the production process, the elastic stress generated by the unwinding of the separator causes the inner ring of the anode to wrinkle, thus affecting the quality of the cells. Utility Model Content

[0004] The purpose of this utility model is to provide a diaphragm roll structure that addresses the shortcomings of existing technologies and solves the technical problem of inner ring wrinkles on the electrode sheet caused by elastic stress retraction during the unwinding process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A diaphragm roll structure includes a roll body, an adjusting wheel, an adjusting guide, and at least one movable member; the adjusting wheel is connected to the roll body; the adjusting guide is connected to the adjusting wheel; and the adjusting wheel is provided with at least one limiting groove; one end of the movable member is movably connected to the interior of the limiting groove in the length direction; the other end of the movable member extends away from the adjusting wheel.

[0007] Preferably, the adjusting guide is a guide pin; one end of the guide pin passes through the adjusting wheel and the drum body in sequence, and one end of the guide pin is connected to the adjusting wheel and the drum body respectively.

[0008] Preferably, the movable part has a positioning element at one end facing the adjusting wheel; the positioning element is movably connected to the limiting groove.

[0009] Preferably, the positioning element is a positioning shaft; the positioning shaft passes through the movable element and is movably connected to the limiting groove.

[0010] Preferably, the outer diameter of the positioning shaft is smaller than the dimension along the length of the limiting groove.

[0011] Preferably, the circumferential surface of the adjusting wheel body is provided with at least one mounting cavity; the mounting cavity is connected to the limiting groove; and the positioning member is disposed through the mounting cavity; at least a portion of the structure of the movable member facing the end of the adjusting wheel body is disposed inside the mounting cavity.

[0012] Preferably, the movable part includes an arc-shaped portion and a mounting portion connected to each other; the positioning member is disposed through the mounting portion; and all the arc-shaped portions are sequentially arranged around the outer surface of the adjusting wheel body in the circumferential direction to form an outer contour that is cylindrical.

[0013] Preferably, the diaphragm roll structure further includes at least one limiting wheel; the limiting wheel is connected to the side end face of the adjusting wheel in the axial direction; and the positioning member is movably connected to the limiting wheel; the movable member is disposed between the limiting wheel and the adjusting wheel.

[0014] Preferably, the limiting wheel body has a guide groove on one end face facing the adjusting wheel body; one end of the positioning member passes through the limiting groove and is movably connected to the inside of the guide groove;

[0015] Furthermore, the angle between the guide groove and its horizontal plane is α; α satisfies: 30°≤α≤65°

[0016] Preferably, the diaphragm roll structure further includes a protective outer layer; the protective outer layer surrounds and is connected to the outer surface of all the moving parts away from the adjusting wheel.

[0017] The beneficial effects of this utility model are that, by using an adjusting guide to drive the adjusting wheel and the drum body to rotate together, the movable part is pulled to move in the length direction of the limiting groove, thereby quickly changing the size of the outer ring of the diaphragm drum structure; thus, it is beneficial to release the elastic stress of the diaphragm through the cyclic movement of the movable part when the diaphragm is unwound, so as to avoid the inner ring wrinkles of the electrode sheet caused by the elastic stress shrinkage; thus improving the quality of the produced battery cells. Attached Figure Description

[0018] The following will refer to the appendix. Figures 1-4 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0019] Figure 1This is a schematic diagram of the diaphragm roll structure according to an embodiment of the present invention;

[0020] Figure 2 This is an exploded view of a diaphragm roll structure according to an embodiment of the present invention;

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

[0022] Figure 4 This is a schematic diagram of the movable component of a diaphragm roll structure according to an embodiment of the present invention.

[0023] In the diagram: 1-Drum body; 2-Adjusting wheel body; 201-Limiting groove; 202-Mounting cavity; 203-Hollowed groove; 3-Adjusting guide; 31-Guide pin; 4-Moving part; 41-Arc-shaped part; 411-Hollowed channel; 42-Mounting part; 421-Mounting hole; 5-Positioning part; 51-Positioning shaft; 6-Protective outer layer; 7-Limiting wheel body; 71-Guide inclined groove; 72-Mounting channel. Detailed Implementation

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is intended to particularly describe embodiments and not to limit the scope of this application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] In the description of the embodiments of this application, 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 embodiment description, "multiple" refers to two or more, unless otherwise specifically defined.

[0026] The term 'embodiment' means that a particular feature, structure, or characteristic described exists in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments in this application, 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 multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can also refer to a mechanical connection or an electrical connection. They can be directly connected or indirectly connected through an intermediate medium, manifesting as internal communication between two components or an interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0029] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0030] like Figure 1 As shown, in one embodiment of this utility model, the diaphragm roll structure includes a roll body 1, an adjusting wheel 2, an adjusting guide 3, and at least one movable member 4. The adjusting wheel 2 is sleeved and connected to the outer surface of the roll body 1 in the circumferential direction. The adjusting guide 3 is connected to the adjusting wheel 2. The adjusting wheel 2 is provided with at least one limiting groove 201. One end of the movable member 4 is movably connected to the interior of the limiting groove 201 in the length direction. The other end of the movable member 4 extends away from the adjusting wheel 2. Wherein, as... Figure 1 and 3 As shown, the length direction of the limiting groove 201 is the AA direction of the adjusting wheel 2 toward the moving part 4.

[0031] The technical solution of this utility model uses an adjusting guide to drive the adjusting wheel and the drum body to rotate together, thereby pulling the movable part to move in the length direction of the limiting groove. This allows for a rapid change in the size of the outer ring of the diaphragm drum structure. Furthermore, it facilitates the release of the diaphragm's elastic stress during unwinding through the cyclical movement of the movable part, thus preventing inner ring wrinkles on the electrode due to elastic stress retraction. This improves the quality of the produced battery cells.

[0032] In some embodiments, one end of the adjusting guide 3 sequentially passes through the adjusting wheel 2 and the drum body 1, and is detachably connected to both the adjusting wheel 2 and the drum body 1. Further, in some embodiments, such as... Figure 1 and 3As shown, the adjusting guide 3 is a guide pin 31; one end of the guide pin 31 passes through the adjusting wheel body 2 and the drum body 1 in sequence, and is threadedly connected to the adjusting wheel body 2 and the drum body 1 respectively. That is, the adjusting wheel body 2 and the drum body 1 are threadedly fastened by the adjusting guide 3, ensuring that there is no relative movement between the structural components after the adjusting wheel body 2 and the drum body 1 are sized; thus, it is beneficial to the smoothness and stability of subsequent operations. Furthermore, the contact surface between the guide pin 31 and the adjusting wheel body 2 is a guide slope, which can be a straight slope or a V-shaped slope, etc., to ensure that the two fit tightly without gaps.

[0033] Specifically, in some implementations, such as Figure 1 and 2 As shown, the end of the movable part 4 facing the adjusting wheel body 2 is provided with a positioning part 5; the positioning part 5 is movably connected to the limiting groove 201. Wherein, as... Figure 1 and 3 As shown, the positioning element 5 is a positioning shaft 51; the positioning shaft 51 passes through the movable element 4 and is movably connected to the limiting groove 201. Further, in some embodiments, there are two limiting grooves 201 at the same horizontal position, symmetrically arranged on the adjusting wheel body 2; the two ends of the positioning shaft 51 are movably connected to the interiors of two different limiting grooves 201. This structure, through the up-and-down sliding movement of the positioning shaft 51, drives the movable element 4 to move up and down, thereby achieving power transmission; thus contributing to the smoothness and stability of subsequent operations.

[0034] Specifically, in some implementations, such as Figure 1 and 3 As shown, the outer diameter of the positioning shaft 51 is smaller than the length dimension of the limiting groove 201. This structure is assembled to the larger-sized limiting groove 201 via the positioning shaft 51 to realize the vertical movement of the moving part in the length direction of the limiting groove, thereby playing a linkage role; thus ensuring the orderliness and stability of the adjustment operation.

[0035] Specifically, in some implementations, such as Figure 2 and 3 As shown, the circumferential surface of the adjusting wheel 2 is provided with at least one mounting cavity 202; the mounting cavity 202 is connected to the limiting groove 201; and the positioning shaft 51 in the positioning member 5 passes through the mounting cavity 202; at least a portion of the structure of the movable member 4 facing the adjusting wheel 2 is disposed inside the mounting cavity 202. This structure, by limiting a portion of the structure of one end of the movable member 4 inside the mounting cavity 202, achieves a limiting and guiding effect on the up and down movement of the movable member 4, thereby helping to ensure the orderliness and stability of the adjustment operation.

[0036] Specifically, in some implementations, such as Figure 3As shown, the circumferential surface of the adjusting wheel 2 is also provided with at least one hollow groove 203; the hollow groove 203 is disposed between two adjacent mounting cavities 202. This structure, by setting the hollow groove, ensures the stability of the overall structure while reducing the overall weight, thereby reducing the input of materials.

[0037] In some implementation methods, such as Figure 1 As shown, all movable parts 4 are sequentially arranged around the outer surface of the adjusting wheel 2 to form a cylindrical outer contour. This structure, through the movement of the movable parts in the length direction of the limiting groove, combined with the upper drum body 1 and the adjusting wheel 2 remaining stationary relative to the movable parts 4, provides directional control for the movement of the movable parts 4, serving as a guide for diameter changes. Furthermore, it can quickly and relatively uniformly change the size of the outer ring of the diaphragm drum structure. This facilitates the release of diaphragm elastic stress during unwinding through the cyclic movement of the movable parts, preventing inner ring wrinkles on the electrode sheets caused by elastic stress retraction, thus improving the quality of the produced battery cells.

[0038] Specifically, in some implementations, such as Figure 2 and 4 As shown, the movable part 4 includes an interconnected arc-shaped portion 41 and a mounting portion 42; the positioning shaft 51 in the positioning part 5 passes through the mounting portion 42; and all the arc-shaped portions 41 are sequentially arranged around the outer surface of the adjusting wheel body 2 in a cylindrical shape. In some embodiments, such as... Figure 4 As shown, the mounting part 42 is provided with a mounting hole 421; the mounting hole 421 is arranged through the length direction of the mounting part 42; and the positioning shaft 51 passes through the mounting hole 421 and is movably connected to the inside of the limiting groove 201. This structure, through the assembly stability of the mounting part and its mounting hole, combined with all the arc-shaped parts 41 forming a cylindrical circumferential side surface, can quickly and relatively uniformly change the size of the outer ring of the diaphragm roll structure. Furthermore, by the movement of the movable part in the length direction of the limiting groove, combined with the roll body 1 and the adjusting wheel 2 remaining stationary relative to the movable part 4, the movement direction of the movable part 4 is controlled, serving as a diameter guide; and the size of the outer ring of the diaphragm roll structure can be quickly and relatively uniformly changed; thus, it is beneficial to release the elastic stress of the diaphragm through the cyclic movement of the movable part during diaphragm unwinding, avoiding inner ring wrinkles on the electrode due to elastic stress retraction; thereby improving the quality of the produced battery cells. Further, as... Figure 4 As shown, the arc-shaped part 41 is provided with a hollow channel 411; the hollow channel 411 is arranged through the thickness direction of the arc-shaped part 41; to ensure its support stability while reducing its overall weight and reducing the input of materials.

[0039] Specifically, in some implementations, such as Figure 1 and2 As shown, the diaphragm roll structure also includes at least one limiting wheel 7; the limiting wheel 7 is connected to the side end face of the adjusting wheel 2 in the axial direction; and the positioning shaft 51 in the positioning member 5 is movably connected to the limiting wheel 7; the movable member 4 is disposed between the limiting wheel 7 and the adjusting wheel 2. In some embodiments, the limiting wheel 7 has an installation channel 72; the outer surface of the roll body 1 is tightly fitted against the inner wall of the installation channel 72; and the limiting wheel 7 is detachably connected to the adjusting wheel 2 by a stepped screw and a washer; the movable member 4 is disposed between the limiting wheels 7 at the left and right ends. This structure ensures the assembly stability and smooth adjustment of the movable member 4 by limiting the movable member 4 at both ends of the limiting wheel 7; and the washer has an anti-loosening function, improving the assembly stability between the limiting wheel 7 and the adjusting wheel 2.

[0040] Specifically, in some implementations, such as Figure 2 As shown, the limiting wheel 7 has a guide groove 71 on one end face facing the adjusting wheel 2; one end of the positioning shaft 51 in the positioning member 5 passes through the limiting groove 201 and is movably connected inside the guide groove 71; and the angle between the guide groove 71 and its horizontal plane is α; α satisfies: 30°≤α≤65°; it can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, etc.; preferably 45°. This structure, through the sliding cooperation between the inclined guide groove 71 and the positioning shaft 51, allows the positioning shaft 51 to move up and down while simultaneously moving diagonally left and right within the guide groove 71 under the rotation of the guide pin 31 and the adjusting wheel 2, thus achieving a linkage effect; thereby ensuring the orderliness and stability of the adjustment operation.

[0041] Specifically, in some implementations, such as Figure 1 As shown, the diaphragm roll structure also includes a protective outer layer 6; the protective outer layer 6 surrounds and is connected to the outer surface of all moving parts 4 away from the adjusting wheel 2. In some embodiments, the protective outer layer 6 is disposed around the outer surface of all arcuate portions 41 away from the adjusting wheel 2 to achieve a covering effect on the moving parts 4, thereby ensuring that the outer surface of the entire diaphragm roll structure is flat.

[0042] The operation method is as follows:

[0043] 1. Pre-winding operation of the diaphragm: First, adjust the guide 3 to rotate and adjust the adjusting wheel 2 to the large diameter position; then, the movable part 4 moves upward with the rotating adjusting wheel 2, so that the entire roll reaches the maximum diameter; next, the protective outer layer 6 of the elastic rubber moves upward with the movable part 4 to support it and flatten the gap between the movable parts 4 to make the outer diameter flat; then, manually lock the guide 3 to the large diameter position; finally, place the roll on the machine for diaphragm winding.

[0044] 2. Pre-unwinding operation of the diaphragm: First, the diameter of the diaphragm roll to be loaded onto the machine is changed in advance by adjusting the adjusting wheel 2 to the small diameter position; then, the movable part 4 moves downward with the adjusting wheel 2, so that the entire roll reaches the minimum diameter state; next, the protective outer layer 6 of the elastic rubber moves downward with the movable part 4 and retracts, flattening the entire outer surface of the movable part 4 and keeping it flat; then, manually lock it in the small diameter position by adjusting the guide part 3; after the diaphragm roll is stationary for a certain period of time, the diaphragm retracts to a tension-free state; finally, the diaphragm roll (the diaphragm roll and the roll are now integrated) is placed on the machine for diaphragm unwinding to produce the winding of the battery cell.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A diaphragm roll structure, characterized in that: It includes a drum body, an adjusting wheel body, an adjusting guide, and at least one movable member; the adjusting wheel body is connected to the drum body; the adjusting guide is connected to the adjusting wheel body; and the adjusting wheel body is provided with at least one limiting groove; one end of the movable member is movably connected to the interior of the limiting groove in the length direction; the other end of the movable member extends away from the adjusting wheel body.

2. The diaphragm roll structure according to claim 1, characterized in that: The adjusting guide is a guide pin; one end of the guide pin is sequentially inserted into the adjusting wheel body and the drum body, and the other end of the guide pin is connected to the adjusting wheel body and the drum body respectively.

3. The diaphragm roll structure according to claim 1, characterized in that: The movable part is provided with a positioning element at one end facing the adjusting wheel; the positioning element is movably connected to the limiting groove.

4. The diaphragm roll structure according to claim 3, characterized in that: The positioning element is a positioning shaft; the positioning shaft passes through the movable element and is movably connected to the limiting groove.

5. The diaphragm roll structure according to claim 4, characterized in that: The outer diameter of the positioning shaft is smaller than the dimension along the length of the limiting groove.

6. The diaphragm roll structure according to claim 3, 4, or 5, characterized in that: The circumferential surface of the adjusting wheel is provided with at least one mounting cavity; the mounting cavity is connected to the limiting groove; and the positioning member passes through the mounting cavity; at least a portion of the structure of the movable member facing the end of the adjusting wheel is disposed inside the mounting cavity.

7. The diaphragm roll structure according to claim 6, characterized in that: The movable part includes an interconnected arc-shaped portion and a mounting portion; the positioning member is disposed through the mounting portion; and all the arc-shaped portions are sequentially arranged around the outer surface of the adjusting wheel body in the circumferential direction to form an outer contour that is cylindrical.

8. The diaphragm roll structure according to claim 3 or 4, characterized in that: The diaphragm roll structure further includes at least one limiting wheel; the limiting wheel is connected to the side end face of the adjusting wheel in the axial direction; and the positioning member is movably connected to the limiting wheel; the movable member is disposed between the limiting wheel and the adjusting wheel.

9. The diaphragm roll structure according to claim 8, characterized in that: The limiting wheel body has a guide groove on one end face facing the adjusting wheel body; one end of the positioning member passes through the limiting groove and is movably connected to the inside of the guide groove; Furthermore, the angle between the guide groove and its horizontal plane is α; α satisfies: 30°≤α≤65°.

10. The diaphragm roll structure according to claim 1, characterized in that: The diaphragm roll structure also includes a protective outer layer; the protective outer layer surrounds and is connected to the outer surface of all the moving parts away from the adjusting wheel.

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