CN211545388U

CN211545388U - Flat roll and film feeding system thereof

Info

Publication number: CN211545388U
Application number: CN201922453426.3U
Authority: CN
Inventors: 姜林华
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-09-22
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to a lithium battery processing technology field discloses a flat roller and film feeding system thereof, and this flat roller (300) includes first roll body (301), is equipped with the burr on the surface of first roll body, and the burr includes that two sections that extend to the both ends of first roll body respectively from the center of first roll body revolve to opposite spiral dogtooth (310), and two sections spiral dogteeth can be at the rotation in-process of flat roller, will follow the center of first roll body through the film of flat roller and smoothly spread to both sides edge. The utility model discloses effectively improve the fold that the diaphragm between just, the negative pole piece of film produced in the lithium cell at the course of working and turn over a book, improve the lithium cell security, simple structure is compact, easy operation and practicality are strong.

Description

Flat roll and film feeding system thereof

Technical Field

The utility model relates to a lithium cell processing technology field specifically relates to flat roll and film feeding system thereof.

Background

In the existing lithium battery assembly production process, the assembly method generally includes two methods, namely a winding method and a lamination method, wherein the winding method is to continuously turn over the battery cell through a winding needle so as to wind the battery cell; the side lamination rule adopted by the soft-packaged battery core is to stack the battery core in multiple layers. Although the two process methods have differences, the final purpose is to regularly superpose three raw materials of the positive plate, the negative plate and the diaphragm into a complete battery cell. In the construction of lithium batteries, the separator is one of the key internal components. The performance of the diaphragm determines the interface structure, internal resistance and the like of the battery, directly influences the capacity, circulation, safety performance and other characteristics of the battery, and the diaphragm with excellent performance plays an important role in improving the comprehensive performance of the battery. The separator has a main function of separating the positive electrode and the negative electrode of the battery to prevent short circuit due to contact between the two electrodes, and also has a function of allowing electrolyte ions to pass therethrough. In general, in order to avoid direct contact between the positive plate and the negative plate, the edge size of the separator needs to be 2-5um larger than the edge size of the positive plate and the negative plate as a whole, so as to effectively perform the isolation function.

The main material of current diaphragm is PP \ PE (polypropylene \ polyethylene), and thickness is between 10-25um, and is softer based on diaphragm material itself, and the existence of static in addition, and the in-process diaphragm of walking the material in production is because take place fold, turn over very easily, and can't cover just, negative pole piece completely, causes just, negative pole piece direct contact for there is the danger of short circuit or little short circuit in the lithium cell. In the prior art, the industry generally requires that an operator firstly ensures that a diaphragm is not wrinkled in the diaphragm feeding process, then deviation correction is performed through EPC (edge position control), and the unfavorable states of wrinkling and folding during the use process of the diaphragm are avoided through the action of a tension roller. However, in the above process, the occurrence of the poor condition of slight wrinkles of the diaphragm cannot be completely overcome due to the difference of the tension at the two ends of the diaphragm, the fluctuation of the tension of the equipment, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the material loading in-process film that prior art exists and appearing fold easily and turn over the problem of rolling over, provide a flat roll and film feeding system thereof, through set up the flat roll in film feeding system, effectively eliminated the fold of film and turned over a book, avoid causing unfavorable influence to follow-up process.

In order to achieve the above object, an aspect of the present invention provides a flat roll, including a first roll body be equipped with the burr on the surface of first roll body, the burr includes the follow the center of first roll body respectively to two sections that extend at the both ends of first roll body are revolved to opposite spiral dogtooth, two sections spiral dogtooth can the rotation in-process of flat roll will pass through the film of flat roll is followed the center of first roll body is to both sides edge level and smooth spreading.

Preferably, the cross-sectional shape of the helical lobes is trapezoidal or rectangular.

The utility model discloses the second aspect provides a film feeding system, including the material loading roller that is used for convoluteing and discharges the film with be used for right the operation platform that follow-up technology was handled is carried out to the film be equipped with between material loading roller and the operation platform as above the flat roller, the film is followed the material loading roller discharges and via the flat roller discharges extremely operation platform.

Preferably, a regulating roller for averaging the tension of the two ends of the film perpendicular to the feeding direction of the film feeding system is arranged between the feeding roller and the flat roller.

Preferably, the adjusting roller comprises a second roller body which is rotatably arranged on a first support, and the first support is rotatably fixed on a second support through a rotating shaft.

Preferably, the second bracket is provided with a limiting block for limiting the rotation range of the first bracket relative to the second bracket at two end edges of the second bracket facing the first bracket.

Preferably, the film feeding system comprises a plurality of intermediate rollers for changing the feeding direction of the film.

Preferably, the intermediate roll is disposed between the feeding roll and the adjusting roll, between the adjusting roll and the flat roll, or between the flat roll and the operation platform.

Preferably, the film feeding system comprises an edge position control device, and the edge position control device is arranged between the adjusting roller and the flat roller.

Preferably, the loading roller comprises at least two reels capable of automatic reloading.

Through the technical scheme, the flattening rollers are arranged in the film feeding system, so that the folds and the folding of the film are effectively eliminated, and the adverse effect on the subsequent technological process is avoided.

Drawings

Fig. 1 is a schematic perspective view of a flat roll according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 in the direction A;

FIG. 3 is a schematic view of the structure of FIG. 1 in the direction B;

fig. 4 is a schematic view of an overall structure of a film feeding system according to an embodiment of the present invention;

FIG. 5 is a schematic perspective view of the conditioner roller of FIG. 4;

FIG. 6 is a schematic view of the structure of FIG. 5 in the direction of C;

fig. 7 is a schematic view of the structure in direction D of fig. 5.

Description of the reference numerals

100 feeding roller 200 operation platform 300 flat roller 301 first roller body 310 spiral convex tooth 400 adjusting roller 410 first support 420 second roller body 430 rotating shaft 440 second support 450 stop block 500 middle roller 600 edge position control device 700 common tension roller 800 fine adjustment roller 1000 film feeding system 2000 large diameter p pitch of film d screw

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" generally means upper, lower, left, and right as illustrated with reference to the accompanying drawings; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.

As shown in fig. 1 to 3, an aspect of the present invention provides a flat roller, including a first roller body 301, a convex pattern is disposed on an outer surface of the first roller body 301, the convex pattern includes two spiral convex teeth 310 that are opposite to each other and extend from a center of the first roller body 301 to two ends of the first roller body 301, and the spiral convex teeth 310 can be in a rotation process of the flat roller 300, and a film passing through the flat roller 300 is smoothly spread from a center of the first roller body 301 to two side edges. The thread teeth 310 may adopt various structural forms according to actual needs, and in order to facilitate rolling and flattening of the film 2000, the cross-sectional shape of the thread teeth 310 may be generally trapezoidal or rectangular. Of course, in addition to the above two shapes, other suitable shapes can be selected and set according to the material of the film and the width of the whole flat roller, and are not described in detail herein. In the embodiment shown in fig. 1-3, thread teeth 310 are trapezoidal in cross-sectional shape. That is to say, the utility model discloses a set up the flat roll-out in film feeding system, effectively eliminated the fold of film and turned over a book, avoid causing adverse effect to follow-up process.

In the embodiment shown in fig. 1 to 3, the flattening roller 300 can effectively improve the wrinkles and folding of the film, and because the material of the first roller body 301 is a soft high molecular polymer, and the surface of the first roller body is processed by a spiral texture, the specific processing method includes: clockwise spiral threads are respectively arranged at the left end and the right end in the middle of the first roller body 301. Specifically, in this embodiment, the major diameter d of the thread is 80mm, the pitch p is 10mm, and the trapezoidal thread processing is adopted, so that the advantages of the above structure form are that the root pressing strength is high, the contact surface with the film is flat, and the surface of the film cannot be damaged. Because the raised lines arranged on the first roller body 301 are two sections of spiral convex teeth 310 with opposite rotation directions, which extend from the center of the first roller body 301 to two ends, respectively, if any two points on the two sections of spiral convex teeth 310 with opposite rotation directions are taken as two reference points, along with the rotation of the flat roller 300, the contact positions of the two reference points and the film gradually move outwards from the middle part of the roller body 300, and after the film passes through the stretching and pressing in which the contact points continuously expand outwards, the wrinkles and the folding are effectively improved, and the tension of the film is effectively released in the process, so that the problem of the wrinkles of the film is solved.

As shown in fig. 4, the present invention provides a film feeding system 1000, comprising a feeding roller 100 for winding and applying a film 2000 and an operation platform 200 for performing a subsequent process on the film 2000, wherein a flat roller 300 as described above is disposed between the feeding roller 100 and the operation platform 200, and the film 2000 is applied from the feeding roller 100 and applied to the operation platform 200 via the flat roller 300 for a subsequent winding or stacking process.

Further, as shown in fig. 4, a regulation roller 400 for averaging the tensions of both ends of the thin film 2000 perpendicular to the feeding direction of the thin film feeding system is provided between the feeding roller 100 and the flat roller. Specifically, as shown in fig. 5 to 7, the adjusting roller 400 includes a second roller body 420 rotatably disposed on a first bracket 410, and the first bracket 410 is rotatably fixed to a second bracket 440 by a rotating shaft 430. In order to effectively control the rotation amplitude of the first bracket 410 relative to the second bracket 440, the second bracket 440 is provided with a limiting block 450 towards the two end edges of the first bracket 410 for limiting the rotation range of the first bracket 410 relative to the second bracket 440.

As shown in fig. 5 to 7, the working principle and the working process of the adjustable roller 400 in the film feeding system are as follows:

the adjustment roller 400 has previously passed the horizontal alignment before the film feeding system starts the feeding operation, and thus is very sensitive to the change of the center of gravity of the second roller body 420 fixed to the first frame 410. When the film 2000 on the second roller 420 passing through the first support 410 deviates at the left and right ends perpendicular to the feeding direction of the film 2000, the center of gravity of the second roller 420 changes, and the adjusted roller 400 which is horizontally calibrated in advance is centered on the corrected center of gravity, so that the first support 410 is centered on the rotating shaft 430 to drive the second roller 420 to rotate within a certain range, thereby preventing the film 2000 from deviating in one direction and correcting the film 2000 in time. The side-to-side swinging motion is achieved by rotatably fixing the first bracket 410 with the second roller body 420 to the second bracket 440. And the second bracket 440 functions to fix the conditioner roll 400 in the film feeding system.

It should be noted that, in practical application, in the film feeding system 1000 provided by the present invention, according to a plurality of practical requirements such as the material of the film 2000, the size of the field range and the trend of the film 2000 in the feeding system 1000, the system further includes a plurality of intermediate rollers 500 for changing the feeding direction of the film 2000. Specifically, the intermediate roll 500 may be disposed between the feeding roll 100 and the adjusting roll 400, between the adjusting roll 400 and the flat roll, or between the flat roll and the operation platform 200. In general, the intermediate rollers 500 in the film feeding system are smooth-surfaced rollers made of metal, and are subjected to plating treatment on the surfaces thereof, so as to prevent the intermediate rollers 500 from damaging the film 2000 during feeding, and further prevent the positive and negative electrode sheets of the lithium battery from being in contact with each other and being short-circuited in the subsequent processing process.

In other embodiments, an edge position control device 600 may be further included in the film feeding system, and the edge position control device 600 is disposed between the conditioning roller 400 and the flat roller. In addition, as shown in fig. 4, the film feeding system 1000 provided by the present invention can further set a common tension roller 700 commonly used in the existing system between the adjusting roller 400 and the operation platform 200, and the feeding of the membrane is realized by providing tension through the left-right swing. At the same time, a trimming roller 800 may be provided before the operation platform 200 for final trimming of the film 2000 to be applied to the operation platform 200.

In a further embodiment, in order to facilitate the change of material and increase the production efficiency, the feeding roller 100 comprises at least two reels 101 capable of automatic change of material. Meanwhile, a detection mechanism is correspondingly arranged in the film feeding system 1000, and when the detection mechanism detects that the supply of the film 2000 on one reel 101 is exhausted, the film can be automatically changed, so that the waste of man-hour caused by manual material changing is reduced. Because the more specific content of detection mechanism and automatic reloading is not the key point that the utility model discloses protect, no longer give unnecessary details here one by one.

As shown in fig. 4, the feeding process of the film feeding system provided by the present invention is as follows:

the film 2000 is discharged from the reel 101 of the feeding roll 100, passes through the adjustment roll 400 after passing through the plurality of intermediate rolls 500, and is very sensitive to the change of the center of gravity of the second roll body 420 fixed to the first frame 410 because the adjustment roll 400 is horizontally aligned in advance before the film feeding system starts the feeding operation. When the film 2000 on the second roller 420 passing through the first support 410 deviates at the left and right ends perpendicular to the feeding direction of the film 2000, the center of gravity of the second roller 420 changes, and the adjusted roller 400 which is horizontally calibrated in advance is centered on the corrected center of gravity, so that the first support 410 is centered on the rotating shaft 430 to drive the second roller 420 to rotate within a certain range, thereby preventing the film 2000 from deviating in one direction and correcting the film 2000 in time. While the first bracket 410 drives the second roller body 420 to rotate, the limit blocks 450 disposed at the two end edges of the second bracket 440 facing the first bracket 410 effectively limit the range of the rotation angle of the first bracket 410. Thus, the film 2000 adjusted by the roller 400 is adjusted in edge position by the edge position control device 600 arranged in the film feeding system, and then is rolled and spread by the flat roller, so that the surface of the film 2000 is completely removed with wrinkles and folding under the rolling and spreading effects of the trapezoidal spiral convex teeth 310 which rotate clockwise from the center of the flat roller to both ends, and then is output to the operation platform 200 through the common tension roller 700 and the fine adjustment roller 800 to prepare for entering the subsequent process.

To sum up, the utility model discloses a set up the flattening roller in film feeding system, handle the film before getting into follow-up coiling or lamination technology, smooth the position that the diaphragm has the fold, avoid causing adverse effect to follow-up technology. By adjusting the roller, the problem that the tension of the left side and the right side of the film is uneven is effectively solved, the film is prevented from wrinkling in the subsequent feeding process, and short circuit caused by contact of the positive electrode sheet and the negative electrode sheet of the lithium battery is avoided. The film feeding system is simple and compact in structure and easy to operate, can be realized by modifying the existing feeding system, is obvious in effect, improves the fold and the turnover of the film serving as a diaphragm between the positive pole piece and the negative pole piece in the lithium battery in the processing process, improves the safety of the lithium battery, and is high in practicability.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The utility model discloses an in the technical conception scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, for example, can be according to actual need and the place requirement that sets up of equipment, to the setting position of various rollers in the film feeding system and set up the order and make up the adjustment to it is more reasonable to make the material loading process. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The utility model provides a flat roller, includes first roll body (301), its characterized in that be equipped with the burr on the surface of first roll body (301), the burr includes from the center of first roll body (301) respectively to two sections of revolving that extend at the both ends of first roll body (301) are to opposite spiral dogtooth (310), two sections spiral dogtooth (310) can be in the rotation in-process of flat roller (300), will pass through film (2000) of flat roller (300) are followed the center of first roll body (301) is to both sides edge smooth spreading.

2. The flattening roll according to claim 1, characterized in that the cross-sectional shape of the helical teeth (310) is trapezoidal or rectangular.

3. A film feeding system comprising a feeding roll (100) for winding and applying a film (2000) and an operation platform (200) for performing a subsequent process to the film (2000), characterized in that a flat roll (300) according to claim 1 or 2 is provided between the feeding roll (100) and the operation platform (200), the film (2000) being applied from the feeding roll (100) and to the operation platform (200) via the flat roll (300).

4. A film feeding system according to claim 3, wherein a dancer (400) for averaging the tension of both ends of the film (2000) perpendicular to the feeding direction of the film feeding system is provided between the feeding roller (100) and the flat roller (300).

5. The film feeding system according to claim 4, wherein the adjusting roller (400) comprises a second roller body (420) rotatably disposed on a first support (410), and the first support (410) is rotatably fixed on a second support (440) by a rotating shaft (430).

6. The film feeding system according to claim 5, wherein the second bracket (440) is provided with a stopper (450) for limiting a rotation range of the first bracket (410) relative to the second bracket (440) at both end edges of the first bracket (410).

7. The film feeding system according to claim 4, wherein the film feeding system comprises a plurality of intermediate rollers (500) for changing a feeding direction of the film (2000).

8. The film feeding system according to claim 7, wherein the intermediate roll (500) is disposed between the feeding roll (100) and the adjusting roll (400), between the adjusting roll (400) and the flat roll (300), or between the flat roll (300) and the operation platform (200).

9. The film feeding system according to claim 4, wherein an edge position control device (600) is included in the film feeding system, and the edge position control device (600) is disposed between the adjustment roller (400) and the flat roller (300).

10. A film feeding system according to claim 3, wherein said feeding roller (100) comprises at least two reels (101) capable of automatic reloading.