CN115029078A - Novel anti-drop soft-package winding battery cell and rubberizing method - Google Patents
Novel anti-drop soft-package winding battery cell and rubberizing method Download PDFInfo
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- CN115029078A CN115029078A CN202210953128.4A CN202210953128A CN115029078A CN 115029078 A CN115029078 A CN 115029078A CN 202210953128 A CN202210953128 A CN 202210953128A CN 115029078 A CN115029078 A CN 115029078A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/50—Adhesives in the form of films or foils characterised by a primer layer between the carrier and the adhesive
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/304—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
A novel anti-falling soft-package winding battery cell and a novel anti-falling soft-package winding battery cell using the same are provided. The rubberizing includes: a single-side glue layer of a polyester film; the hot melt adhesive layer is arranged on the outer side of the single-side adhesive layer of the polyester film, and the adhesive amount of the middle part of the hot melt adhesive layer is larger than that of the two sides of the hot melt adhesive layer. The hot melt adhesive layer adopts a curved surface design, and hot melt adhesive can flow in the rubberizing hot pressing process, so that the surface flatness of the battery is better. In addition, the hot melt adhesive can also play a better role in carrying away gas. A novel gluing method for a drop-resistant soft-packaged winding battery cell. According to the invention, the hot melt adhesive layer is adopted, so that the anti-falling capacity of the battery cell is improved, the minimum design thickness is ensured, the thickness is reduced by 20 micrometers compared with the conventional double-adhesive tape, and the volume energy density is improved by-0.2%. In the adhesive tape sticking process, the hot melt adhesive layer adopts a cambered surface design, the fluidity of the hot melt adhesive during hot pressing is utilized, the gas is discharged in an auxiliary mode, the bubble residual probability is reduced, and the appearance problem is improved.
Description
Technical Field
The invention relates to the technical field of winding cells, in particular to a novel anti-falling soft-package winding cell, a novel anti-falling soft-package winding cell rubberizing method and a novel anti-falling soft-package winding cell rubberizing method.
Background
With the continuous improvement of the technological level, lithium batteries are also widely used in various industries. And in current electric core manufacturing technology, naked electric core (the electric core that does not refer to any safeguard measure) directly places inside the shell, because there is certain clearance still between naked electric core and the shell, can take place relative slip between naked electric core and the shell. After the lithium cell is in putting into market, the customer probably appears falling, vibration and other forms's mechanical impact in the use, naked electric core is owing to can slide (rock) for the shell to naked electric core does not have the safeguard measure, will appear short circuit, damage very easily, safety problems such as burning even.
In order to solve the above problems, the prior art proposes the following improvements: the double faced adhesive tape is pasted on the surface of the naked electric core, and the reinforcing and the auxiliary positioning between the electric core and the aluminum plastic film (the aluminum plastic film is a protective film structure arranged outside the electric core) are realized through the double faced adhesive tape, so that the relative movement between the electric core and the aluminum plastic film is weakened. By adopting the mode of sticking the double-sided adhesive tape, although the sliding of the battery cell relative to the aluminum-plastic film is reduced to a certain degree, the number of sub-parts of the lithium battery can be additionally increased by sticking the adhesive tape, and meanwhile, the thickness of the battery cell can also be increased.
In addition, current viscose technology is only applicable to lamination formula lithium cell (the pole piece and the diaphragm assembly of diaphragm one deck the electric core of the layer structure that forms together), and in rolling up formula lithium cell (the pole piece assembles with the diaphragm is good with the diaphragm and then rolls up and assemble into electric core), because the surface is fluffy curved surface when the electric core of coiling is deposited naturally, if set up the rubberizing, the rubberizing can appear the fold, even there are more bubbles even have after flattening, thereby cause the high proportion outward appearance of lithium cell bad, consequently, the rubberizing reinforcement mode is not suitable for the electric core of coiling structure.
Disclosure of Invention
Problem (A)
In summary, how to provide a rubberizing reinforcement method suitable for a rolled lithium battery becomes a problem to be solved urgently by those skilled in the art.
(II) technical scheme
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a novel anti-falling rubberizing for a soft-package winding battery cell, which comprises the following components in percentage by weight:
the polyester film single-sided adhesive layer is used for sealing and ending the diaphragm on the outer layer of the wound battery cell;
the hot melt adhesive layer is arranged on the outer side of the single-side adhesive layer of the polyester film, the adhesive amount of the middle part of the hot melt adhesive layer is larger than the adhesive amounts of the two sides of the hot melt adhesive layer, and the hot melt adhesive layer is used for dispersing the hot melt adhesive to the two sides to form a pressed adhesive layer with the same thickness after the middle part of the hot melt adhesive layer is pressed;
set up in the release paper in the hot melt adhesive layer outside.
Preferably, in the novel anti-drop soft-package wound core rubberizing provided by the invention, a fusion layer used for realizing the combination of the polyester film single-face adhesive layer and the hot melt adhesive layer is arranged between the polyester film single-face adhesive layer and the hot melt adhesive layer.
Preferably, in the novel anti-drop rubberizing for the soft-package wound battery cell provided by the invention, the thickness range of the fusion layer is as follows: 2 um-5 um; the thickness range of the single-sided glue line of the polyester film is as follows: 2 um-5 um; the thickness range of the hot melt adhesive layer is as follows: 5um ~15 um.
Preferably, in the novel anti-falling adhesive for the soft-package wound battery cell, the adhesive amount of the middle part of the hot-melt adhesive layer is greater than the adhesive amounts of the two sides of the hot-melt adhesive layer along the width direction of the hot-melt adhesive layer; and along the length direction of the hot melt adhesive layer, the cross section of the hot melt adhesive layer is the same in shape.
The invention also provides a novel anti-drop soft-package winding battery cell, which comprises:
the battery cell comprises a winding tail end;
and, as above-mentioned novel anti-falling soft-package is convoluteed rubberizing for electric core, novel anti-falling soft-package is convoluteed rubberizing for electric core including polyester film single face glue film and hot melt adhesive layer, polyester film single face glue film set up in the coiling tail end is used for sealing the ending to coiling electric core outer diaphragm, the middle part of hot melt adhesive layer corresponds the coiling tail end sets up.
Preferably, in the novel drop-resistant soft-package winding battery cell provided by the invention, the long central line of the hot melt adhesive layer is parallel to and corresponds to the winding tail end.
The invention also provides a novel anti-falling rubberizing method of the soft-package winding battery cell, which comprises the following steps:
step one, winding the battery cell;
step two, sealing and ending the wound battery cell by using the novel anti-falling soft-package wound battery cell and the rubberizing;
step three, putting the battery core into a shell and covering the box;
step four, carrying out hot pressing on the battery cell and dispersing the middle part of the hot melt adhesive layer of the novel anti-falling soft-package winding battery cell rubberizing to two sides after the hot melt adhesive layer is pressed to form a pressed adhesive layer with consistent thickness;
step five, packaging and vacuum baking the battery cell;
and step six, injecting liquid into the battery cell.
Preferably, in the novel anti-drop soft-package wound battery cell rubberizing method provided by the invention, in the fifth step, after the battery cell is packaged and vacuum-baked, secondary hot pressing on the battery cell is further included.
Preferably, in the fourth step of the rubberizing method of the novel drop-resistant soft-package wound battery cell provided by the invention, the middle part of the hot-melt adhesive layer is pressed down in a plane, and then the adhesive amount on the two sides is rolled.
Preferably, in the novel gluing method for the drop-resistant soft-package wound battery cell provided by the invention, in the fourth step, a hot-pressing tool is used for hot-pressing the battery cell; the hot-pressing tool comprises a hot-pressing plate for pressing the middle part of the hot-melting adhesive layer down in a plane and hot-pressing rollers which are respectively arranged on two sides of the hot-pressing plate and are used for rolling the adhesive amount on the two sides; the width of hot pressing frock is less than the width of novel anti falling soft packet of coiling rubberizing for electric core.
(III) advantageous effects
The invention provides a novel anti-falling soft-package winding battery cell and a novel anti-falling soft-package winding battery cell using the same. The rubberizing includes: the polyester film single-sided adhesive layer is used for sealing and ending the diaphragm on the outer layer of the wound battery cell; the hot melt adhesive layer is arranged on the outer side of the single-sided adhesive layer of the polyester film, the adhesive amount of the middle part of the hot melt adhesive layer is larger than that of the two sides of the hot melt adhesive layer, and the hot melt adhesive layer is used for dispersing the hot melt adhesive to the two sides to form a pressed adhesive layer with the same thickness after the middle part of the hot melt adhesive layer is pressed; and the release paper is arranged on the outer side of the hot melt adhesive layer. Through the structural design, the hot melt adhesive layer adopts a curved surface design (the middle adhesive amount is large, and the two sides adhesive amount is small), and the hot melt adhesive can flow in the rubberizing hot-pressing process, so that the surface flatness of the battery is better. In addition, the hot melt adhesive can also play a better role in carrying away gas.
The invention also provides a rubberizing method of the novel anti-falling soft-package winding battery cell, and the rubberizing method of the novel anti-falling soft-package winding battery cell comprises the following steps: step one, winding the battery cell; step two, sealing and ending the wound battery cell by using the novel anti-falling soft-package wound battery cell with the adhesive; step three, putting the battery core into a shell and covering the box; step four, carrying out hot pressing on the battery cell, and dispersing the middle part of the hot melt adhesive layer of the rubberizing for the novel anti-falling soft-package winding battery cell after being pressed to two sides to form a pressed adhesive layer with consistent thickness; step five, packaging the battery cell and performing vacuum bagging; and step six, injecting liquid into the battery cell. According to the invention, the mode of combining the ending green adhesive (the single-side adhesive layer of the polyester film) with the hot-melt adhesive layer is adopted, so that the anti-falling capability of the battery cell is increased, the minimum design thickness is ensured, compared with the conventional double-adhesive tape, the thickness is reduced by 20 microns, and the volume energy density is improved by 0.2%. In the rubberizing, the hot melt adhesive layer adopts the cambered surface design, has utilized the mobility of hot melt adhesive during hot pressing, and the supplementary gas that discharges has reduced bubble residual probability, improves the outward appearance problem.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a simplified structural schematic diagram of a novel anti-drop adhesive for a soft-package wound battery cell in the embodiment of the invention;
fig. 2 is a schematic diagram of a structure in which the novel anti-drop soft-packaged winding battery cell is pasted to a winding battery cell by using a sticker in the embodiment of the invention;
fig. 3 is a top view of the novel anti-drop soft-packaged wound electrical core adhered to a wound electrical core by a tape in an embodiment of the invention;
fig. 4 is an axonometric view of the novel anti-drop soft-package wound cell subjected to hot pressing in the embodiment of the invention;
fig. 5 is a schematic diagram of a structure of the novel anti-drop soft-package winding battery cell during hot pressing in the embodiment of the invention;
fig. 6 is a flowchart of a rubberizing method of the novel anti-drop soft-package wound battery cell in the embodiment of the present invention.
In fig. 1 to 5, the correspondence between the part names and the reference numerals is:
a polyester film single-sided adhesive layer 1, a hot melt adhesive layer 2, release paper 3, a fusion layer 4, a battery core 5,
Winding the tail end 6, a hot pressing plate 7 and a hot pressing roller 8;
the wide side of the adhesive tape is a, and the long side of the adhesive tape is b.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
Referring to fig. 1 to fig. 6, in which, fig. 1 is a schematic diagram of a structure of a novel anti-drop soft-package winding cell adhesive tape in an embodiment of the present invention; fig. 2 is a schematic diagram of a structure in which the novel anti-drop soft-packaged winding battery cell is pasted to a winding battery cell by using a sticker in the embodiment of the invention; fig. 3 is a top view of the novel drop-resistant soft-packaged wound battery cell in an embodiment of the present invention, which is adhered to a wound battery cell by a tape; fig. 4 is an axonometric view of the novel anti-drop soft-package wound cell subjected to hot pressing in the embodiment of the invention; fig. 5 is a schematic diagram of a structure of the novel anti-drop soft-package winding battery cell during hot pressing in the embodiment of the invention; fig. 6 is a flowchart of a gluing method of the novel drop-resistant soft-package wound battery cell in the embodiment of the invention.
The invention provides a novel anti-falling adhesive for a soft-package winding battery cell, which is called the adhesive for short, has the winding, wrapping and fixing functions of the winding battery cell 5 (namely, a pole piece and a diaphragm are laid layer by layer and then wound up, the tail end of the winding battery cell 5 needs to be fixed at the moment so that the battery cell 5 can not be uncoiled), and also has the function of firmly bonding and fixing the battery cell 5 and an aluminum plastic film (the aluminum plastic film needs to be arranged outside the winding battery cell 5, and the battery cell 5 and the aluminum plastic film can be bonded and fixed together through the adhesive, so that the battery cell 5 can not slide relative to the aluminum plastic film).
The novel anti-falling adhesive for the soft-package winding battery cell specifically comprises a four-layer structure:
a first layer: and the polyester film single-sided adhesive layer 1 is used for sealing and ending the diaphragm on the outer layer of the winding electric core 5.
The polyester film single-side glue layer 1 is an ending green glue used by a traditional winding battery cell 5, and is mainly used for realizing the ending of the sealing of an outer diaphragm of the winding battery cell 5 so as to ensure the structural stability (without uncoiling) of the winding battery cell 5.
A second layer: and a fusion layer 4.
The fusion layer 4 is a connecting transition layer arranged on the upper side (outer side) of the polyester film single-sided adhesive layer 1, and is actually a composite layer structure formed by combining the polyester film single-sided adhesive layer 1 and the hot melt adhesive layer 2. The lower side (inner side) of the fusion layer 4 and the polyester film single-sided adhesive layer 1 are in a fixed connection structure, and the hot melt adhesive layer 2 is firmly arranged on the polyester film single-sided adhesive layer 1. The lower layer structure of the polyester film single-side adhesive layer 1 is an adhesive layer, the upper layer structure is a polyester film, and if the hot melt adhesive layer 2 is directly arranged on the polyester film, the connection strength between the hot melt adhesive layer 2 and the polyester film is weaker. Therefore, according to the material characteristics of the polyester film and the hot melt adhesive layer 2, the fusion layer 4 and the polyester film can have reliable connection strength and the polyester film and the hot melt adhesive layer 2 can have reliable connection strength by reasonably selecting the materials of the fusion layer 4.
And a third layer: and the hot melt adhesive layer 2 is arranged on the outer side of the polyester film single-sided adhesive layer 1.
The hot melt adhesive layer 2 is a hot melt adhesive layer, and the hot melt adhesive layer 2 shows to have certain mobility after being heated, so, after being heated and pressed, can take place the adhesive layer and warp towards certain direction (the concrete expression is the change of adhesive layer thickness, and can extend to around). Meanwhile, the hot melt adhesive layer 2 also has the same adhesive function as the double-sided adhesive tape (but the double-sided adhesive tape does not have a property of being thermally deformed). According to the material characteristics of the hot melt adhesive layer 2, the arrangement of the hot melt adhesive layer 2 is designed as follows: the glue amount of the middle part of the hot melt glue layer 2 is larger than that of the two sides of the hot melt glue layer 2, and the hot melt glue is dispersed to the two sides to form a pressed glue layer with the same thickness after the middle part of the hot melt glue layer 2 is pressed. For those skilled in the art, when the seal is closed and terminated to the wound battery cell 5, a glue layer is pasted to the tail end of the wound battery cell 5 along the axial direction of the battery cell 5 (the battery cell 5 is in a wound structure, and the axial direction of the battery cell 5 can be understood as a winding reference line when the battery cell 5 is wound). The adhesive layer (adhesive tape) is in a long strip-shaped structure, the adhesive layer is provided with a wide edge a and a long edge b, the long edges b of the adhesive layer are two edges parallel to the axis of the battery cell 5, and the wide edge a of the adhesive layer is two edges perpendicular to the axis of the battery cell 5. The central portion of the above-mentioned hot-melt adhesive layer 2 means the central portion corresponding to the adhesive layer wide side a.
In the prior art, need use the green glue of ending up to carry out the tail end after electric core 5 coils and fixes, avoid electric core 5 to open a book, can set up the one deck double faced adhesive tape again in addition, one side and the green glue adhesion of ending up of double faced adhesive tape, another side and the plastic-aluminum membrane adhesion of double faced adhesive tape. Due to the requirement that the double-sided adhesive tape needs to be firmly bonded and fixed on the two sides, the double-sided adhesive tape needs to have a certain thickness, and the double-sided adhesive tape is applied to the winding of the battery cell 5, and wrinkles (partially stretched and partially extruded) appear in the winding process of the battery cell 5, so that the appearance of the battery cell 5 is poor.
Aiming at the problems, the hot melt adhesive layer 2 is adopted, the structure of the hot melt adhesive layer 2 is optimally designed, and the structure is characterized in that: 1. compared with the double-sided adhesive in the prior art, the hot melt adhesive is heated to show certain flowability, so that the hot melt adhesive can deform under pressure, and the appearance of the battery cell 5 is kept highly flat (beautiful); 2. the hot melt adhesive has the function of adhesion and fixation, and can realize the adhesion and fixation between the battery cell 5 and the aluminum plastic film; 3. the hot melt adhesive layer 2 "the middle part is glued the volume greatly, the structure that the volume is little is glued on both sides", can be when 2 hot pressing on hot melt adhesive layer, the hot melt adhesive at middle part can flow to both sides, at the in-process that the hot melt adhesive flows, realize that the thickness of whole back glue film of pressing keeps unanimous, the uniformity of each point joint strength between electric core 5 and the plastic-aluminum membrane has both been guaranteed, can fill the gap that probably exists between electric core 5 and the plastic-aluminum membrane at the in-process that the hot melt adhesive flows again, avoid appearing the hole (the hole is exactly to the clearance that exists between electric core 5 or the plastic-aluminum membrane, if gapped then can be when annotating the liquid the air of melting, reduce the condition of annotating the liquid quality).
Specifically, along the width direction of hot melt adhesive layer 2 (the direction that is on a parallel with broadside a), the glue volume in the middle part of hot melt adhesive layer 2 is greater than the glue volume in both sides of hot melt adhesive layer 2, promptly: the glue amount of the hot melt glue is larger (thicker) corresponding to the middle part of the wide edge a of the glue layer, and the glue amount of the hot melt glue is smaller (thinner) at the two edges of the glue layer. Along hot melt adhesive layer 2's length direction, hot melt adhesive layer 2's cross sectional shape is the same, along hot melt adhesive layer 2's length direction promptly, and the volume of gluing on the same straight line highly uniform.
A fourth layer: and the release paper 3 is arranged on the outer side of the hot melt adhesive layer 2.
Set up the one deck protection paper on 2 lateral surfaces of hot melt adhesive layer from type paper 3, avoid impurity to cause hot melt adhesive layer 2 stained and reduce the appearance of 2 adhesion strength problems of hot melt adhesive layer.
In the present invention, the thickness range of the fusion layer 4 is: 2 um-5 um, specifically 2um, 3um, 4um, 5 um; the thickness range of the single-sided glue layer 1 of the polyester film is as follows: 2 um-5 um, specifically 2um, 3um, 4um, 5 um; the thickness range of the hot melt adhesive layer 2 is as follows: 5um ~15um specifically can be 5um, 6um, 7um, 8um, 9um, 10um, 11um, 12um, 13um, 14um, 15 um.
Compared with the traditional double-sided adhesive tape, the novel anti-falling adhesive tape for the soft-package winding battery cell provided by the invention has the advantage that the thickness is obviously reduced. In the conventional technology, the thickness of the final green tape and the double-sided layer can reach 30 um to 40 um. The minimum thickness of the double-sided adhesive tape can be controlled to be 9um, and the maximum thickness of the double-sided adhesive tape does not exceed 20um, so that the thickness of the double-sided adhesive tape is remarkably reduced compared with a double-sided adhesive tape sticking mode in the prior art. In addition, in the prior art, the double-sided adhesive tape itself does not deform (the thickness does not change), and thus when the double-sided adhesive tape is applied to the winding battery cell 5, wrinkles occur to cause a large amount of poor appearance of the battery cell 5. In the invention, due to the adoption of the hot melt adhesive layer 2, the hot melt adhesive layer 2 is heated to show flowability in a hot pressing mode, and can deform under pressure, so that the problem of poor appearance of the battery cell 5 is solved according to the self-adaptive flow of the hot melt adhesive under pressure.
The invention also provides a novel anti-falling soft-package winding battery cell, which specifically comprises: the electric core 5 of lap winding structure and as above-mentioned novel anti-falling soft-package winding electricity core are with rubberizing. Wherein, electricity core 5 is including coiling tail end 6, and novel anti falling soft packet of electricity core for coiling rubberizing is including polyester film single face glue film 1 and hot melt adhesive layer 2, and polyester film single face glue film 1 sets up and is used for sealing the ending to coiling 5 outer diaphragms of electricity core in coiling tail end 6, and the middle part of hot melt adhesive layer 2 corresponds coiling tail end 6 and sets up.
The battery cell 5 comprises pole pieces (a positive pole piece and a negative pole piece) and a diaphragm, wherein the pole pieces are paved on the diaphragm, then the diaphragm is wound up from one end of the diaphragm to form the winding battery cell 5, and when the winding is finished, the novel anti-falling soft-package winding battery cell provided by the invention needs to be sealed, ended and fixed by using the adhesive, so that the battery cell 5 keeps structural stability (does not unwind). After the battery cell 5 is wound, the novel anti-falling soft-package wound battery cell needs to be pasted to the winding tail end 6 of the battery cell 5 by using a sticker. Specifically, novel anti falling soft packet of winding electricity core is as follows with the mode of setting up of rubberizing: the long central line of the hot melt adhesive layer 2 (the central line of the two wide sides a of the hot melt adhesive layer 2, which is a virtual straight line) is parallel to and corresponds to the winding tail end 6, and after the novel anti-drop soft-package winding battery cell is pasted on the battery cell 5 by the paste adhesive, the long central line of the hot melt adhesive layer 2 can be regarded as coinciding with the winding tail end 6. Like this, when middle part pressurized, the both sides roll extrusion of hot melt adhesive layer 2, it is unanimous basically to coil the area that sets up of the hot melt adhesive layer 2 of 6 both sides of tail end, avoids because the appearance of the easy fracture problem of pasting unbalance.
The invention also provides a novel gluing method of the anti-falling soft-package winding battery cell, which comprises the following steps:
step one, winding the battery cell 5. In step one, the operation is mainly a conventional winding operation in which the positive and negative electrodes are separated by the separator.
And step two, sealing and ending the wound battery cell 5 by using the novel anti-falling soft-package wound battery cell rubberizing. Specifically, after the winding of the battery core (i.e., step one) is completed, firstly, the gummed paper is cut (the novel anti-falling soft-package adhesive tape for winding the battery core), and then the sucker is used for moving the gummed paper to a corresponding position to press down, so that the adhesive tape is fixed at the ending position of the battery core pole piece.
And step three, the battery cell 5 is arranged in a shell (an aluminum-plastic film), and box covers (a pit is punched on the aluminum-plastic film, and the aluminum-plastic film at the edge of the pit) are arranged at two ends of the battery cell 5. Specifically, the wound battery cell is operated, firstly, a pit is punched in the aluminum plastic film, the battery cell is placed in the cavity (a cavity structure matched with the shape of the wound battery cell is formed by punching the pit), and then the aluminum plastic film cover is turned over.
Step four, carry out hot pressing to electric core 5 and make novel anti falling soft packet of coiling electricity core with the hot melt adhesive layer 2 middle part of rubberizing after pressurized to both sides dispersion formation pressing back glue film that thickness is unanimous.
In the fourth step, the hot pressing tool is heated to a set temperature, then the hot pressing tool is pressed down at a constant speed, the pressure is kept after the pressure reaches the set value, and the shaping rollers (the hot pressing rollers on the two sides) outwards shape the adhesive tapes on the two sides for hot pressing to complete the hot pressing.
Further, the middle part of the hot melt adhesive layer 2 is pressed down in a plane, and then the adhesive amount on the two sides is rolled.
In the fourth step, a hot-pressing tool is used for hot-pressing the battery cell 5, and the hot-pressing tool comprises a hot-pressing plate 7 for performing plane pressing on the middle part of the hot-melt adhesive layer 2 and hot-pressing rollers 8 which are respectively arranged on two sides of the hot-pressing plate 7 and are used for rolling the adhesive amount on the two sides; the width of hot pressing frock is less than the width of novel anti falling soft package rubberizing for coiling electric core. Specifically, resistance wires are arranged on the hot pressing plate 7 and the hot pressing roller 8, and the resistance wires are electrified to release heat in the rolling process, so that the electric core 5 is hot pressed.
And step five, packaging the battery cell 5 and performing vacuum Baking (vacuum Baking).
Further, after the encapsulation and the vacuum Baking of the battery cell 5, a secondary hot pressing of the battery cell 5 is also included. After encapsulating electric core 5, carrying out vacuum drying to electric core 5 through using vacuum Baking stove (vacuum Baking oven), electric core 5 can produce certain steam in vacuum drying process, and partial steam can be sealed in electric core 5 structure and unable excessive, annotates the liquid back in the later stage, and steam, the air of being sealed in electric core 5 structure can reduce the quality of annotating the liquid, and then influence the wholeness ability of battery. In order to expel water vapor and air, the battery cell 5 is packaged and vacuum Baking (vacuum Baking) followed by secondary hot pressing of the battery cell 5, and the water vapor and air in the structure of the battery cell 5 can be extruded out through the secondary hot pressing.
And step six, injecting liquid into the battery cell 5.
The adhesive paper is divided into four layers, single-side green adhesive is bonded with the battery cell 5, and the adhesive paper is rolled by using a roller. Then tearing the release paper 3, putting the electric core 5 into the shell, and carrying out first hot pressing on the electric core 5 after the box cover so as to enable the hot melt adhesive to be combined with the aluminum plastic film preliminarily. After the battery cell 5 is dried, hot pressing is performed for the second time before liquid injection, so as to remove all gas between the adhesive layer and the aluminum-plastic film.
From the above, the invention provides the novel anti-falling soft-package winding battery cell rubberizing tape, and based on the rubberizing tape, the invention further provides the novel anti-falling soft-package winding battery cell using the rubberizing tape. This novel anti-falling soft-package coiling electricity core is with rubberizing includes: a polyester film single-sided adhesive layer 1 for sealing and ending the diaphragm on the outer layer of the winding battery cell 5; the hot melt adhesive layer 2 is arranged on the outer side of the single-sided adhesive layer 1 of the polyester film, the adhesive amount of the middle part of the hot melt adhesive layer 2 is larger than that of the two sides of the hot melt adhesive layer 2, and the hot melt adhesive is dispersed to the two sides to form a pressed adhesive layer with the same thickness after the middle part of the hot melt adhesive layer 2 is pressed; and the release paper 3 is arranged on the outer side of the hot melt adhesive layer 2. In this rubberizing design, hot melt adhesive layer 2 is the core structure that realizes pasting fixedly between electric core 5 and the plastic-aluminum membrane, and 2 curved surface designs of hot melt adhesive layer (middle gluey volume is big, both sides are glued for a short time), and hot melt adhesive can flow at rubberizing hot pressing in-process to make battery surface smoothness better. In addition, the hot melt adhesive can also play a better role in carrying away gas.
The invention also provides a rubberizing method of the novel anti-falling soft-package winding battery cell, and the rubberizing method of the novel anti-falling soft-package winding battery cell comprises the following steps: step one, winding the battery cell 5; step two, sealing and ending the wound battery cell 5 by using the novel anti-falling soft-package wound battery cell rubberizing; step three, putting the battery cell 5 into a shell and covering the box; step four, carrying out hot pressing on the battery cell 5, and dispersing the middle part of the hot melt adhesive layer 2 of the novel anti-falling soft-package winding battery cell rubberizing to two sides after being pressed to form a pressed adhesive layer with consistent thickness; step five, packaging and vacuum Baking (vacuum Baking) are carried out on the battery cell 5; and step six, injecting liquid into the battery cell 5.
In the rubberizing method provided by the invention, in order to prevent the pressure edge contact surface from leaving an indentation on the surface of the battery cell 5 or causing the damage of the outermost ring of pole pieces in the hot-pressing rubberizing process, the traditional large-surface hot-pressing mode is changed into dynamic rolling. Therefore, the invention also provides a set of rolling tool, the rolling tool starts to press downwards from the middle part of the battery cell 5, and the rollers on the two sides roll outwards after flattening. The pressure is set between 500kgf and 1500kgf, wherein 1000kgf is the most preferable.
The invention adopts the dewatering vacuum Baking furnace to carry out vacuum Baking, the dewatering vacuum Baking furnace has higher temperature consistency and a compact box body structure, and a vacuum system is integrated in the box body, so the installation and the use are very convenient.
Please refer to the following table, which is an icon of a falling experiment and a bad appearance ratio after the novel anti-falling soft-package winding battery core rubberizing method is adopted in the invention.
| Test method | 1.8 m drop test pass rate | Appearance defective proportion (surface bubble) |
| Non-adhesive paper | 35% | 0% |
| Examples | 100% | 85% |
| Comparative example | 100% | 0% |
The main improvement point of the invention is to provide a rubberizing with a novel structure, and after the rubberizing is used, the beneficial effects of the invention are summarized as follows:
1. the invention adopts the mode of combining the ending green adhesive (the single-side adhesive layer 1 of the polyester film) with the hot melt adhesive layer 2, thereby not only increasing the anti-falling capability of the battery cell 5, but also ensuring the minimum design thickness, and compared with the conventional double-adhesive tape, the thickness is reduced by 20um, and the volume energy density is improved by about 0.2%;
2. in the adhesive sticking, the hot melt adhesive layer 2 adopts a cambered surface design, and the fluidity of the hot melt adhesive during hot pressing is utilized to assist in exhausting gas, so that the bubble residual probability is reduced, and the appearance problem is improved;
3. the surface of the conventional winding battery cell 5 is a circular arc surface, which is difficult to be pasted with glue, and the conventional flat plate hot pressing, namely the vertical rolling, can cause a large amount of bubbles and press the pole piece. The invention adopts the method of middle flat pressing and two-side rolling, thereby greatly improving the hot-pressing yield.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a novel anti-falling soft-packaged winding rubberizing for electric core, a serial communication port, include:
the polyester film single-sided adhesive layer (1) is used for sealing and ending the diaphragm on the outer layer of the wound battery core;
the hot melt adhesive layer (2) is arranged on the outer side of the single-side adhesive layer of the polyester film, the adhesive amount of the middle part of the hot melt adhesive layer is larger than the adhesive amounts of the two sides of the hot melt adhesive layer, and the hot melt adhesive layer is used for dispersing the hot melt adhesive to the two sides to form a pressed adhesive layer with the same thickness after the middle part of the hot melt adhesive layer is pressed;
and the release paper (3) is arranged on the outer side of the hot melt adhesive layer.
2. The novel anti-drop rubberizing for the soft-packaged winding battery cell according to claim 1, wherein,
and a fusion layer (4) used for realizing the combination of the polyester film single-sided adhesive layer and the hot melt adhesive layer is arranged between the polyester film single-sided adhesive layer and the hot melt adhesive layer.
3. The novel anti-drop soft-package winding battery cell adhesive tape according to claim 2, characterized in that,
the thickness range of the fusion layer is as follows: 2 um-5 um;
the thickness range of the single-sided glue line of the polyester film is as follows: 2 um-5 um;
the thickness range of the hot melt adhesive layer is as follows: 5um ~15 um.
4. The novel anti-drop rubberizing for soft-packaged wound cells according to any one of claims 1 to 3,
along the width direction of the hot melt adhesive layer, the adhesive amount of the middle part of the hot melt adhesive layer is larger than the adhesive amount of the two sides of the hot melt adhesive layer;
along the length direction of the hot melt adhesive layer, the cross section of the hot melt adhesive layer is the same in shape.
5. The utility model provides a novel anti falling soft packet of electricity core of convoluteing which characterized in that includes:
a cell (5) of a wound configuration, the cell comprising a winding tail (6);
the novel anti-drop soft-package wound core adhesive tape according to any one of claims 1 to 4, which comprises a polyester film single-face adhesive layer and a hot-melt adhesive layer, wherein the polyester film single-face adhesive layer is disposed at the winding tail end for sealing and ending the wound core outer membrane, and the middle part of the hot-melt adhesive layer is disposed corresponding to the winding tail end.
6. The novel drop-resistant soft-pack wound cell of claim 5,
and the long central line of the hot melt adhesive layer is parallel to and correspondingly arranged with the winding tail end.
7. The utility model provides a rubberizing method of novel anti falling soft packet of coiling electricity core which characterized in that includes:
step one, winding the battery cell;
step two, using the novel anti-drop soft-packaged wound battery cell as claimed in any one of claims 1 to 4 to seal and terminate the wound battery cell with a rubberizing tape;
step three, putting the battery core into a shell and covering the box;
step four, carrying out hot pressing on the battery cell and dispersing the middle part of the hot melt adhesive layer of the novel anti-falling soft-package winding battery cell rubberizing to two sides after the hot melt adhesive layer is pressed to form a pressed adhesive layer with consistent thickness;
step five, packaging and vacuum baking the battery cell;
and step six, injecting liquid into the battery cell.
8. The novel gluing method for the drop-resistant soft-packaged wound battery cell according to claim 7, characterized in that,
in the fifth step, after the cell is packaged and vacuum-baked, secondary hot pressing of the cell is further included.
9. The novel gluing method for the drop-resistant soft-packaged wound battery cell according to claim 7, characterized in that,
in the fourth step, the middle part of the hot melt adhesive layer is firstly pressed down in a plane, and then the adhesive amount on the two sides is rolled.
10. The novel gluing method for the drop-resistant soft-packaged wound battery cell according to claim 9, wherein,
in the fourth step, a hot-pressing tool is used for hot-pressing the battery cell;
the hot-pressing tool comprises a hot-pressing plate (7) for pressing the middle part of the hot-melting adhesive layer down in a plane manner and hot-pressing rollers (8) which are respectively arranged on two sides of the hot-pressing plate and are used for rolling the adhesive amount on the two sides;
the width of hot pressing frock is less than the width of novel anti falling soft packet of coiling rubberizing for electric core.
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