CN114873329A

CN114873329A - Method and device for winding ultraviolet-curing high-heat-resistance diaphragm

Info

Publication number: CN114873329A
Application number: CN202210478021.9A
Authority: CN
Inventors: 钱伟; 李迎丰; 庄志; 虞少波
Original assignee: Suzhou Greenpower New Energy Materials Co ltd
Current assignee: Suzhou Greenpower New Energy Materials Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-08-09

Abstract

The invention discloses a winding method and a winding device of an ultraviolet curing high-heat-resistance diaphragm. A rolling method of an ultraviolet curing high-heat-resistance diaphragm comprises the following steps: A. applying static electricity to a lithium battery separator; B. winding the lithium battery diaphragm with static electricity on a winding core; the winding core comprises a cylinder body and a metal conductor, wherein the cylinder body is made of plastics, and the metal conductor is arranged on or in the cylinder body. The winding method and the winding device for the lithium battery diaphragm can automatically receive materials when the coil is changed and have a good winding effect.

Description

Method and device for winding ultraviolet-curing high-heat-resistance diaphragm

Technical Field

The invention relates to a winding method and a winding device of an ultraviolet curing high-heat-resistance diaphragm.

Background

The manufactured or slit lithium battery diaphragm product needs to be wound on a winding core for storage, transportation and rear-end application. At present, most of winding cores for lithium battery diaphragms are ABS (acrylonitrile butadiene styrene) cores, the ABS cores are synthesized from three chemical monomers of acrylonitrile, butadiene and styrene, the resistivity test is high, and the test resistivity is greater than 10 ¹⁵ Omega object, not easy to generate static electricity, not static conductor (more than 10) ¹⁰ Omega cm objects are not electrostatic conductors). Therefore, the ABS roll core can not lead the diaphragm to be automatically adsorbed on the roll core in an electrostatic adsorption mode, can not automatically receive materials when changing rolls, and is easy to generate roll bottom wrinkles.

Disclosure of Invention

Aiming at the technical problems, the invention provides an improved winding method and a winding device of an ultraviolet curing high-heat-resistance diaphragm, which can automatically receive materials when changing the coil and have better winding effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

a rolling method of an ultraviolet curing high-heat-resistance diaphragm comprises the following steps:

A. applying static electricity to a lithium battery separator;

B. winding the lithium battery diaphragm with static electricity on a winding core;

the winding core comprises a cylinder body and a metal conductor, wherein the cylinder body is made of plastics, and the metal conductor is arranged on or in the cylinder body.

In some preferred embodiments, the metal conductor is grounded.

More preferably, the winding core comprises a pair of chucks, the pair of chucks are respectively arranged at two ends of the cylinder body, the chucks are made of conductive materials, and the chucks and the metal conductor are in conduction connection; the winding core is arranged on the rotating frame, and the chuck is grounded through the rotating frame.

More preferably, the metal conductor comprises a conductive adhesive tape, the conductive adhesive tape is attached to the outer side surface and the end surface of the cylinder, and the conductive adhesive tape on the end surface is in contact conduction with the chuck.

In some preferred embodiments, step B specifically includes: lithium battery diaphragm rolling is on first rolling core, and during the full book, it rolls up the core upset to the second position from the primary importance to drive first rolling through the swivel mount, the swivel mount drives second rolling simultaneously and rolls up the core upset extremely on the primary importance, cut off the diaphragm, the diaphragm limit adsorbs under electrostatic adsorption's effect and rolls up the core surface at the second rolling, rolls up the diaphragm on the core is rolled up in the second rolling.

More preferably, when the first winding core is in the first position, the separator moves from the pushing roller to the first winding core; when the first winding core is at the second position, the diaphragm moves to the first winding core from the pushing roller after passing through one or more rollers; in step a, static electricity is applied to the diaphragm by a static electricity generating device, and the static electricity generating device is arranged between the pushing roller and the first position or the passing roller.

The invention also adopts the following technical scheme:

the utility model provides a coiling mechanism of ultraviolet curing high heat-resisting diaphragm, includes the rolling core that is used for the rolling diaphragm, is used for applying the static generating device of static and is used for the cutter that cuts off the diaphragm to the diaphragm, the rolling core includes barrel and metallic conductor, the barrel is made by plastics, metallic conductor locates on the barrel or in the barrel.

In some preferred embodiments, the winding device further includes a rotating frame capable of rotating around a horizontally extending rotating shaft, and a pushing roller located in front of the rotating frame, the winding cores include a first winding core and a second winding core, the first winding core and the second winding core are disposed on the rotating frame and located on two sides of the rotating shaft, respectively, and the rotating frame is further provided with a through roller located between the first winding core and the second winding core; the winding device has a winding state and a roll changing state, when in the winding state, the first winding roll core is positioned at a first position, the second winding roll core is positioned at a second position, and the diaphragm passes through the pushing roller and the first winding roll core; when changing the book state, first rolling core is located the second position, second rolling core is located the first position, and the diaphragm passes through in proper order impel roller, at least one cross the roller and first rolling core, the cutter is located impel the roller with cross between the roller.

More preferably, each winding core comprises a pair of chucks, the pair of chucks are respectively arranged at two ends of the barrel, the chucks are made of conductive materials, and the chucks and the metal conductor are in conduction connection; the winding core is arranged on the rotating frame, and the chuck is grounded through the rotating frame. The metal conductor is communicated with the ground through the chuck, and the metal conductor, the chuck and the large body form a huge static electric conductor, so that the adsorption effect on the lithium battery diaphragm is better, and the automatic material receiving is smoother.

Optionally, the metal conductor comprises a conductive tape or a conductive coating disposed on the surface of the cylinder, or the metal conductor comprises a metal wire or a metal mesh belt disposed in the cylinder, or the metal conductor comprises metal particles formed in the cylinder.

In some preferred embodiments, the metal conductor is a conductive adhesive tape attached to the outer side surface and/or the inner side surface of the cylinder.

More preferably, the conductive adhesive tape is arranged on the end face of the cylinder.

More preferably, the winding core comprises a pair of chucks for fixing the barrel, the pair of chucks are respectively arranged at two ends of the barrel, the chucks are made of conductive materials, and the chucks and the conductive adhesive tapes on the end surfaces are in contact conduction.

More preferably, the conductive tape has a nickel layer and a copper layer overlying the nickel layer.

In other preferred embodiments, the metal conductor is a conductive coating coated on the outer side and/or the inner side of the cylinder.

More preferably, the end face of the cylinder is covered with the conductive coating; the winding roll core comprises a pair of chucks for fixing the cylinder, the chucks are respectively arranged at two ends of the cylinder and are made of conductive materials, and the chucks are in contact conduction with the conductive coating strips on the end faces.

In further preferred embodiments, the metal conductor comprises a wire or a wire mesh strip, the wire or wire mesh strip being disposed within the barrel.

In some preferred embodiments, the winding core further comprises a heat-shrinkable sleeve sleeved outside the cylinder.

In some preferred embodiments, the winding core includes a plurality of metal conductors, the metal conductors are distributed at intervals along the circumferential direction of the cylinder, and at least part of each metal conductor extends along the axial direction of the cylinder.

More preferably, the metallic conductor extends axially from one end of the barrel to the other.

More preferably, the winding core further comprises a rubber strip attached to the outer side surface of the cylinder.

Compared with the prior art, the invention has the following advantages by adopting the scheme:

according to the winding method, static electricity is applied to the isolation, then the winding core with the metal conductor is adopted, the metal conductor on the winding core can form an electrostatic field with the lithium battery diaphragm with the static electricity, the lithium battery diaphragm can be adsorbed on the surface of the winding core, the lithium battery diaphragm can be automatically connected when the coil is changed, and the production efficiency is improved; the rolling effect of the diaphragm is good, the possibility of rolling wrinkles is reduced, and particularly the rolling bottom wrinkles are eliminated; and the winding core has better strength, longer service life and difficult damage, avoids material loss and reduces the cost.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a winding device in a winding state according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a winding device in a winding change state according to an embodiment of the invention.

Fig. 3 is a schematic structural view of the first winding core in fig. 1.

Fig. 4 is a schematic view of a portion of the first winding core of fig. 1.

Wherein: 1. a pusher roller; 2. a rotating frame; 3. a first winding core; 4. a second winding core; 5. passing through a roller; 6. a static electricity generating device; 7. a cutter; 8. a diaphragm;

11. a barrel; 111. an outer side surface; 112. an end face; 12. a chuck; 13. a conductive tape; 14. an adhesive tape; 15. a heat shrinkable sleeve.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment provides a winding method of a lithium battery diaphragm (particularly an ultraviolet curing high-heat-resistance diaphragm), which comprises the following steps: A. applying static electricity to a lithium battery separator; B. and winding the lithium battery diaphragm with static electricity on a winding core. The winding method is realized by the winding device shown in fig. 1 to 4.

As shown in fig. 1 and 2, the winding device includes a pushing roller 1, a rotating frame 2, a winding core, a roller 5, an electrostatic generator 6, and a cutter 7. Wherein, the rolling core and the roller 5 set up on the swivel mount 2, and swivel mount 2 can rotate around the rotation axis of horizontal extension. The static electricity generator 6 applies static electricity to the diaphragm 8, and the cutter 7 cuts the diaphragm 8. Specifically, there are two winding cores, i.e., a first winding core 3 and a second winding core 4. First rolling core 3 and second rolling core 4 are located the relative both sides of rotation axis respectively, and a plurality of roller 5 that cross set up at interval between first rolling core 3 and second rolling core 4. First rolling core 3, second rolling core 4, roller 5 all can overturn with the switching position along with the rotation of swivel mount 2, and simultaneously, first rolling core 3, second rolling core 4, roller 5 can also rotate along respective axial lead respectively. On the threading path of the separator 8, the impeller roller 1 is located in front of the rotating frame 2 to feed the separator 8 to the winding core.

The winding device has a winding state and a reel changing state. As shown in fig. 1, in the winding state, the first winding core 3 is located at the first position, the second winding core 4 is located at the second position, and the diaphragm 8 passes through the pushing roller 1 and the first winding core 3 and is then wound by the first winding core 3; the static electricity generating device 6 is located between the impeller roller 1 and the first position, i.e. the first winding core 3. As shown in fig. 2, in the roll change state, the first winding core 3 is located at the second position, the second winding core 4 is located at the first position, and the diaphragm 8 sequentially passes through the pushing roller 1, the at least one passing roller 5 and the first winding core 3; the static electricity generating device 6 is located between the impeller roller 1 and the first position (i.e. the second winding core 4) and the cutting blade 7 is located between the impeller roller 1 and the feed roller 5. That is to say, when first rolling core 3 is about to the full book, revolving rack 2 clockwise rotation certain angle (for example 180 degrees), make first rolling core 3 and second rolling core 4 upset and the interchange position, that is to say, be about to the second position on right side is traded to first rolling core 3 of full book, empty second rolling core 4 trades left first position, in the process of upset, diaphragm 8 passes through on two roller 5 above, cutter 7 moves to push in roller 1 and crosses the cutting point C between the roller 5 and cuts off diaphragm 8 this moment, 8 limits of diaphragm after the cutting off and attaches on second rolling core 4 automatically under the electrostatic adsorption power of second rolling core 4, realize automatic material receiving, avoid the rolling end wrinkle, diaphragm rolling quality has been improved.

The first winding core 3 and the second winding core 4 are identical in structure. The structure of the first winding core 3 will be described in detail with reference to fig. 3 and 4, and the second winding core 4 is the same and will not be described again. As shown in fig. 3 and 4, the first winding core 3 includes a barrel 11 and a cartridge 12. The cylindrical body 11 is hollow and cylindrical as a whole, and has an outer surface, an inner surface, and two end surfaces located between the outer surface and the inner surface. The number of the cartridge 12 is two, and two are fixed to both ends of the cylinder 11, respectively, thereby coupling the cylinder 11 to the rotating bracket. The cylinder 11 is made of plastic, in particular ABS; the chuck 12 is made of a conductive material such as stainless steel, iron, chromium, aluminum alloy, etc., and the chuck 12 is connected to the ground through the spin stand 2.

The winding core further comprises a metal conductor, and the metal conductor is arranged on the cylinder body 11 or in the cylinder body 11. The metal conductor can and have electrostatic lithium battery diaphragm 8 between produce electrostatic field to can adsorb lithium battery diaphragm 8 on rolling up a core surface, realize automatic connecing the material, and avoid the rolling fold. Further, the collet 12 is conductively connected to the metal conductor. The metal conductor is communicated with the ground through the joint, the rotating frame 2 and the like, and then the metal conductor, the chuck 12, the rotating frame 2 and the ground form a huge electrostatic conductor integrally, so that the adsorption effect on the lithium battery diaphragm 8 is better, and the automatic material receiving is smoother.

Specifically, in the present embodiment, the metal conductor includes a plurality of conductive tapes 13, the conductive tapes 13 are disposed at intervals along the circumferential direction of the cylinder 11, and each conductive tape 13 extends along the axial direction of the cylinder 11 as a whole. At least one conductive adhesive tape 13 is adhered to the outer side surface 111 of the cylinder 11 and extends from one end of the outer side surface 111 of the cylinder 11 to the other end along the axial direction, namely, penetrates through the outer side surface 111 of the cylinder 11; and extends from the end surface 112 of the barrel 11 to the inner side surface of the barrel 11, preferably, the length of the inner side surface is greater than or equal to 50mm, and even penetrates through the inner side surface and is connected with the conductive tape 13 on the outer side surface 111. That is, at least the outer surface 111 and the end surface 112 of the barrel 11 are covered with the conductive tape 13, and the conductive tape 13 on the end surface 12 is in contact with the chuck 12 to be electrically connected. The conductive tape 13 has a nickel layer and a copper layer coated on the nickel layer, and the width is 5-50 mm.

In other embodiments, the metal conductor may be a conductive coating formed by coating conductive paint on the outer side 11, the end surface 12 and the inner side of the barrel 11, and the conductive coating is sized and disposed substantially at the conductive tape 13, and the clip 12 may contact the conductive coating on the end surface 12 to conduct with each other. In other embodiments, the metal conductor may be a metal wire or a metal mesh belt, and the metal wire or the metal mesh belt is disposed in the cylinder 11 and is in contact with the chuck 12. In still other embodiments, the metal conductor includes metal particles that are co-extruded into the feedstock of the barrel 11.

This first rolling core 3 still includes a plurality of adhesive tapes 14 attached on the lateral surface 111 of barrel 11, and these a plurality of adhesive tapes 14 set up along the circumferencial direction interval of barrel 11, and stagger the setting with the metallic conductor, and the metallic conductor sets up in the interval between adhesive tape 14 promptly. The strip 14 is made of a flexible material and can be deformed by shrinkage when pressed. The rubber strip 14 is arranged along the axial direction of the cylinder body 11, and the shape of the section (specifically, the section vertical to the axial lead of the cylinder body 11) of the rubber strip 14 is a semi-ellipse as a whole; the thickness of the adhesive tape 14 is larger than that of the metal conductor, specifically, the width of the bottom of the adhesive tape 14 is 32-38 mm, the thickness is 5-0 mm, and the hardness is 35-65.

The first winding core 3 further comprises a heat shrinkable sleeve 15 sleeved outside the cylinder 11. Specifically, the heat-shrinkable sleeve 15 is sleeved outside the barrel 11 and supported by the rubber strip 14, and the gap between the barrel 111 and the sleeve is filled after heat shrinkage. The heat shrinkable sleeve 15 is made of PVC, EVA or PET.

The winding method is specifically implemented as follows:

applying static electricity to the diaphragm 8 by the static electricity generating means 6;

lithium battery diaphragm 8 rolling is on first rolling core 3, and during the full book, it rolls up core 3 and rolls over to the second position from the primary importance through swivel mount 2 drive first rolling on, swivel mount 2 drives second rolling simultaneously and rolls up core 4 upset to the primary importance on, cuts off diaphragm 8, and the diaphragm limit is adsorbed on the surface of second rolling core 4 under the effect of electrostatic absorption, rolls up diaphragm 8 on core 4 is rolled up in the second rolling.

This embodiment is applyed static to the diaphragm in advance, and the metallic conductor on the rolling core can form the electrostatic field with the lithium battery diaphragm of taking static, can adsorb lithium battery diaphragm on the surface that the rolling core was rolled up in the rolling, can connect the material automatically when the roll change, and the rolling effect of diaphragm is better in addition, reduces the possibility that produces the rolling fold, especially eliminates the end wrinkle of rolling. And the core is made of ABS and other plastics, so that the core has high strength and is not easy to damage.

As used in this specification and the appended claims, the terms "comprises" and "comprising" are intended to only encompass the explicitly identified steps and elements, which do not constitute an exclusive list, and that a method or apparatus may include other steps or elements. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Further, the description of the upper, lower, left, right, etc. used in the present invention is only with respect to the positional relationship of the respective components of the present invention with respect to each other in the drawings.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the principles of the present invention should be covered within the protection scope of the present invention.

Claims

1. A rolling method of an ultraviolet curing high-heat-resistance diaphragm is characterized by comprising the following steps:

A. applying static electricity to a lithium battery separator;

2. The winding method according to claim 1, wherein the metal conductor is grounded.

3. The winding method according to claim 2, wherein the winding core comprises a pair of chucks respectively arranged at two ends of the barrel, the chucks are made of conductive materials, and the chucks are in conductive connection with the metal conductor; the winding core is arranged on the rotating frame, and the chuck is grounded through the rotating frame.

4. The winding method according to claim 2, wherein the metal conductor comprises a conductive adhesive tape, the conductive adhesive tape is attached to the outer side face and the end face of the cylinder body, and the conductive adhesive tape on the end face is in contact conduction with the chuck.

5. The winding method according to claim 1, wherein the step B specifically comprises: lithium battery diaphragm rolling is on first rolling core, and during the full book, it rolls up the core upset to the second position from the primary importance to drive first rolling through the swivel mount, the swivel mount drives second rolling simultaneously and rolls up the core upset extremely on the primary importance, cut off the diaphragm, the diaphragm limit adsorbs under electrostatic adsorption's effect and rolls up the core surface at the second rolling, rolls up the diaphragm on the core is rolled up in the second rolling.

6. The winding method according to claim 5, characterised in that when the first winding core is in the first position, the separator is moved from the pushing roller to the first winding core; when the first winding core is at the second position, the diaphragm moves to the first winding core from the pushing roller after passing through one or more rollers; in step a, static electricity is applied to the diaphragm by a static electricity generating device, and the static electricity generating device is arranged between the pushing roller and the first position or the passing roller.

7. The utility model provides a coiling mechanism of ultraviolet curing high heat-resisting diaphragm, includes the rolling core that is used for the rolling diaphragm, is used for applying the static generating device of static and is used for the cutter that cuts off the diaphragm to the diaphragm, its characterized in that, the rolling core includes barrel and metallic conductor, the barrel is made by plastics, metallic conductor locates on the barrel or in the barrel.

8. The winding device according to claim 7, further comprising a rotating frame capable of rotating around a horizontally extending rotating shaft and a pushing roller positioned in front of the rotating frame, wherein the winding cores comprise a first winding core and a second winding core, the first winding core and the second winding core are arranged on the rotating frame and are respectively positioned on two sides of the rotating shaft, and the rotating frame is further provided with a roller positioned between the first winding core and the second winding core; the winding device has a winding state and a roll changing state, when in the winding state, the first winding roll core is positioned at a first position, the second winding roll core is positioned at a second position, and the diaphragm passes through the pushing roller and the first winding roll core; when changing the book state, first rolling is rolled up the core and is located the second position, second rolling is rolled up the core and is located the first position, the diaphragm passes through in proper order impel roller, at least one cross the roller and first rolling is rolled up the core, the cutter is located impel the roller with cross between the roller.

9. The winding device according to claim 8, wherein each winding core comprises a pair of chucks, the pair of chucks are respectively arranged at two ends of the barrel, the chucks are made of conductive materials, and the chucks are in conductive connection with the metal conductor; the winding core is arranged on the rotating frame, and the chuck is grounded through the rotating frame.

10. The winding device according to claim 7, wherein the metal conductor comprises a conductive tape or a conductive coating provided on the surface of the drum body, or the metal conductor comprises a metal wire or a metal mesh belt provided in the drum body, or the metal conductor comprises metal particles formed in the drum body.

11. The winding device of claim 7, wherein the winding core further comprises a heat-shrinkable sleeve sleeved outside the cylinder; and/or the winding core comprises a plurality of metal conductors which are distributed at intervals along the circumferential direction of the cylinder body, and at least part of each metal conductor extends along the axial direction of the cylinder body.