CN113734904A

CN113734904A - Diaphragm winding buffering winding core

Info

Publication number: CN113734904A
Application number: CN202110937386.9A
Authority: CN
Inventors: 周阳; 刘杲珺; 徐萌; 汤晓; 杨冬梅; 白耀宗
Original assignee: Sinoma Lithium Film Co Ltd
Current assignee: Zhongcai Lithium Film Yibin Co ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2021-12-03
Anticipated expiration: 2041-08-16
Also published as: CN113734904B

Abstract

The invention discloses a diaphragm winding buffer winding core which comprises a winding core main body, a buffer support ring and a buffer support strip, wherein the buffer support ring is formed by splicing two half buffer support pieces, the buffer support ring is sleeved on the outer side wall of the winding core main body, the outer side walls of two ends of the half buffer support pieces are provided with half fixed buckles, a plurality of fixed buckles are distributed between the two half fixed buckles, the buffer support strip is made of elastic materials and is arranged around the outer side walls of the winding core main body and the buffer support ring, and the buffer support strip is provided with a fixed buckle groove matched with the fixed buckles. The invention has the buffer function, is convenient to replace, greatly improves the rolling product rate, greatly reduces the appearance reject ratio of the semi-finished diaphragm, is convenient to release the internal stress of the diaphragm, and greatly reduces the defect quantity when the radian or the edge collapse of the diaphragm is detected.

Description

Diaphragm winding buffering winding core

Technical Field

The invention relates to a diaphragm winding buffer winding core, and belongs to the field of production and manufacturing of lithium battery diaphragms.

Background

The diaphragm plays a role in separating the anode and the cathode in the charge and discharge process of the lithium ion battery, preventing the two electrodes from contacting and short-circuiting, absorbing enough electrolyte, providing enough electrolyte lithium ion channels, protecting the micropores from self closing and the like. The lithium ion conductivity of the separator is directly related to the overall performance of the lithium ion battery, and the performance of the separator determines the interface structure of the battery, the retentivity of the electrolyte, the internal resistance of the battery and the like, so that the important characteristics of the battery, such as the capacity, the cycle performance, the charge-discharge current density, the safety and the like, are influenced.

Existing wet separator manufacturing methods generally include: batching and casting → bidirectional stretching → extraction → transverse stretching → rolling inspection. When the membrane is rolled and inspected, the membrane running at a high speed needs to be quickly rolled into a round shape, so that the membrane is convenient for subsequent use and reprocessing. When the diaphragm is collected into the master roll, the problems of internal stress release and surface appearance retention of the diaphragm need to be noticed, and the phenomena of wrinkles and radians are avoided, and the flatness appearance is prevented from being influenced. If the appearance is affected, the product judgment is degraded, the reject ratio is increased, and the membrane sale is affected. In addition, when the separator is wound, if the inside is a full ring, there is a lack of space for exhausting air when the separator is wound at a high speed, and the separator is liable to wrinkle. The diaphragm is hard-drawn to finish winding by increasing the tension, but the diaphragm is easy to deform, and the quality of the finished diaphragm product is influenced. Therefore, when the separator is subjected to a rolling test, particular attention should be paid to avoid the above-mentioned problem.

However, currently, the winding of the separator is performed by winding the separator around the rigid winding core body by using a single ring; or the semi-finished separator may be wound on the foam material that is integrally sleeved over the inner winding core. But none of these meets the requirements of stress relief and surface appearance retention within the membrane itself.

Disclosure of Invention

The invention aims to provide a diaphragm winding buffer winding core to meet the requirements of internal stress release and surface appearance retention during diaphragm winding inspection.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a diaphragm coiling buffering rolls up core, its includes rolls up the core main part, buffering lock ring and buffering support bar, the buffering lock ring is formed by two half buffering support piece concatenations to buffering lock ring suit installs the buffering support bar around rolling up the lateral wall of core main part and buffering lock ring on rolling up the lateral wall of core main part all around, the buffering support bar adopts elastic material preparation to form.

As a further preferred aspect of the present invention, the half-buffering supporting member includes a supporting half ring, the outer side walls of both ends of the supporting half ring are provided with half-fixing fasteners, and the outer side wall of the supporting half ring between the two half-fixing fasteners is provided with a plurality of fixing fasteners.

As a further optimization of the scheme, after the two half buffer supporting pieces are spliced, the half fixing buckles at the two ends of the two half buffer supporting pieces are mutually butted to form a complete fixing buckle, and the sections of the opposite half fixing buckles are fixed in a bonding mode; the double-sided adhesive tape can be selected for bonding and fixing.

As a further preferred aspect of the scheme, a fixing buckle groove matched with the fixing buckle is formed in one side, facing the buffering support ring, of the buffering support bar, and the fixing buckle is embedded in the fixing buckle groove after the buffering support bar is installed; the fixing buckle and the fixing buckle groove are bonded and fixed through glue or double-sided glue to prevent falling in the early stage of winding; the number of the fixing buckles and the fixing buckle grooves can be manufactured according to the requirement.

As a further preferred option of this scheme, buffering support bar terminal surface is circular or oval to buffering support bar adopts rubber or other materials of easily deforming to make.

As a further optimization of the scheme, the length of the buffering support strip is consistent with the length of the core main body, the width of the buffering support strip is located between 0.2r and 0.7r, and r is the radius of the core main body.

As a further preferable aspect of the present solution, the width of the semi-buffering supporting member satisfies 0.1r-0.25L, where r is the radius of the core body, and L is the length of the core body.

As a further preferred of this scheme, a roll up supporting three buffering support rings of core main part and twelve buffering support bars.

The invention has the beneficial effects that: this diaphragm is convoluteed buffering and is rolled up core and adopt detachable and have buffer function, convenient the change, and the rolling product rate improves greatly, and semi-manufactured goods diaphragm outward appearance defective rate reduces by a wide margin, the release of the diaphragm internal stress of also being convenient for simultaneously, and defect quantity also can reduce in a large number when detecting diaphragm radian or edge collapse.

The effects of the present invention can be further understood by the following comparison:

drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a perspective view of the present invention;

FIG. 3 is a schematic view of the core body construction of the present invention;

FIG. 4 is a schematic view of the structure of the buffer support ring of the present invention;

FIG. 5 is a schematic view of a semi-cushioned support structure of the present invention;

fig. 6 is a schematic view of the structure of the buffering support bar of the present invention.

Labeled as: 1-winding core main body, 2-buffer support ring, 21-half buffer support piece, 22-half fixing buckle, 23-fixing buckle, 24-support semi-ring, 3-buffer support bar and 31-fixing buckle groove.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Referring to fig. 1-6, an embodiment of the present invention is shown: the utility model provides a diaphragm is convoluteed buffering and is rolled up core, its includes rolls up core main part 1, buffering lock ring 2 and buffering support bar 3, buffering lock ring 2 is formed by two half buffering support piece 21 concatenations to 2 suits of buffering lock ring are on rolling up the lateral wall of core main part, install buffering support bar 3 around rolling up core main part 1 and buffering lock ring 2's lateral wall all around, buffering support bar 3 adopts elastic material to make and forms.

In this embodiment, the semi-buffering support 21 includes a support half ring 24, the outer side walls of both ends of the support half ring 24 are provided with semi-fixing fasteners 22, and the outer side wall of the support half ring 24 between the two semi-fixing fasteners 22 is distributed with a plurality of fixing fasteners 23; after the two half buffer supporting pieces 21 are spliced, the half fixing buckles 22 at the two ends of the two half buffer supporting pieces are mutually butted to form a complete fixing buckle 23, the sections of the opposite half fixing buckles 22 are fixed in a bonding mode, and particularly, double-sided adhesive tape can be used for bonding and fixing. In addition, the width of the half buffer support 21 satisfies 0.1r-0.25L, where r is the radius of the winding core body 1 and L is the length of the winding core body 1.

In this embodiment, a fixing buckle groove 31 matched with the fixing buckle 23 is formed in one side of the buffer support bar 3 facing the buffer support ring, and the fixing buckle 23 is embedded in the fixing buckle groove 31 after the buffer support bar 3 is installed; the fixing buckle 23 and the fixing buckle groove 31 are bonded and fixed through glue or double-sided adhesive tape to prevent falling in the early stage of winding; generally, the number of the fixing clip 23 and the fixing clip groove 31 may be made as required.

In this embodiment, the end face of the buffering support bar 3 is circular or elliptical, and the buffering support bar 3 is made of rubber or other materials easy to deform. Usually, the length of the buffer support strip 3 is consistent with the length of the winding core main body, and the width of the buffer support strip 3 is between 0.2r and 0.7r, wherein r is the radius of the winding core main body 1.

In a specific application, one winding core main body is generally matched with three buffer support rings and twelve buffer support bars. The following provides a preferred embodiment:

winding a diaphragm with the diaphragm width of 600mm, using an 8-inch winding core main body, wherein the length of the winding core main body is 800mm, and three buffer support rings are arranged, the width of a half buffer support piece is 20mm, and the width of a buffer support piece is 30mm and the length of the buffer support piece is 800 mm; the three buffer support rings are respectively arranged at the middle position of the winding core main body and are respectively 100mm away from the two end faces, so that the enough support of the end face of the diaphragm is ensured; the supporting strip material is foamed cotton, and inside small-size is hollowed out and is formed fixed buckle groove, and the space slightly is greater than fixed buckle, pastes the double faced adhesive tape above the fixed buckle, strengthens cohesiveness, also is convenient for later stage change and maintenance.

The manufacturing and using method of the diaphragm winding buffer winding core is characterized in that a winding core main body is matched with a buffer support ring and a plurality of buffer support strips. Two half buffering support pieces are fixedly connected in an adhesive mode and then sleeved on the roll core main body. The position is fixed according to the width of follow-up semi-manufactured goods diaphragm respectively, and buffering support bar length is unanimous with roll core main part length, is connected with the fixed buckle of buffering supporting part through the fixed buckle groove that corresponds.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by using equivalent substitution methods fall within the scope of the present invention.

The parts not involved in the present invention are the same as or can be implemented using the prior art.

Claims

1. The utility model provides a diaphragm coiling buffering core, its characterized in that, includes core main part, buffering lock ring and buffering support bar, the buffering lock ring is formed by two half buffering support piece concatenations to buffering lock ring suit is on the lateral wall of core main part is rolled up, installs the buffering support bar around rolling up core main part and buffering lock ring's lateral wall all around, the buffering support bar adopts elastic material preparation to form.

2. The membrane winding buffer winding core according to claim 1, wherein the semi-buffer support comprises a support half ring, the outer side walls of two ends of the support half ring are provided with semi-fixed fasteners, and a plurality of fixed fasteners are distributed on the outer side wall of the support half ring between the two semi-fixed fasteners.

3. The membrane winding buffer winding core according to claim 2, wherein the two half buffer supporting pieces are spliced, the half fixing buckles at the two ends of the two half buffer supporting pieces are butted with each other to form a complete fixing buckle, and the sections of the opposite half fixing buckles are fixed in an adhesion mode.

4. The membrane winding buffer roll core according to claim 3, wherein the sections of the opposite half fixing buckles are bonded and fixed through double-sided adhesive tape.

5. The membrane winding buffering roll core according to claim 2, wherein a fixing buckle groove matched with the fixing buckle is formed in one side, facing the buffering support ring, of the buffering support bar, and the fixing buckle is embedded in the fixing buckle groove after the buffering support bar is installed.

6. The membrane winding buffer winding core according to claim 5, wherein the fixing buckle and the fixing buckle groove are bonded and fixed through glue or double-sided glue.

7. The membrane winding buffer winding core according to claim 1, wherein the end face of the buffer support strip is circular or elliptical, and the buffer support strip is made of rubber or foamed cotton.

8. The membrane winding buffer winding core according to claim 1, wherein the length of the buffer support strip is the same as the length of the winding core main body, and the width of the buffer support strip is between 0.2r and 0.7r, wherein r is the radius of the winding core main body.

9. The membrane winding buffer core of claim 1, wherein the width of the semi-buffer support member is between 0.1r and 0.25L, where r is the core body radius and L is the core body length.

10. The membrane winding buffer roll core of claim 1, wherein a roll core body is provided with three buffer support rings and twelve buffer support bars.