CN113683974A - Double-sided adhesive tape and lithium ion battery - Google Patents
Double-sided adhesive tape and lithium ion battery Download PDFInfo
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- CN113683974A CN113683974A CN202111123544.3A CN202111123544A CN113683974A CN 113683974 A CN113683974 A CN 113683974A CN 202111123544 A CN202111123544 A CN 202111123544A CN 113683974 A CN113683974 A CN 113683974A
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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
-
- 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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
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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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
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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
- C09J2301/124—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 on both sides of the carrier, e.g. double-sided adhesive tape
- C09J2301/1242—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 on both sides of the carrier, e.g. double-sided adhesive tape the opposite adhesive layers being different
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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
- C09J2301/302—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 pressure-sensitive, i.e. 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
- C09J2301/304—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
- C09J2425/00—Presence of styrenic polymer
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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
- C09J2433/00—Presence of (meth)acrylic polymer
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Adhesive Tapes (AREA)
Abstract
The invention provides a double-sided adhesive tape and a lithium ion battery. The invention provides a double-sided tape, which comprises a first bonding layer, a base material layer and a second bonding layer which are sequentially stacked; the first bonding layer comprises one or more of organic silicon adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives and rubber adhesives, and the bonding strength of the first bonding layer is greater than that of the second bonding layer. The double-sided adhesive tape provided by the invention comprises two bonding layers, the bonding strength of the first bonding layer is greater than that of the second bonding layer, the adhesive tape can be effectively and accurately adhered to the surface of a light soft material in an auxiliary adhesive tape transferring mode, and the problems of wrinkling, poor positioning, bubbles and the like of the adhesive tape are effectively solved.
Description
Technical Field
The invention relates to a double-sided adhesive tape and a lithium ion battery, and relates to the technical field of lithium ion batteries.
Background
The adhesive tape has the characteristics of light weight, environmental protection, excellent bonding performance and the like, and is widely applied to various scenes of life and industrial production, such as sealing, fixing, repairing, warning and the like. However, the adhesive tape has more inconvenience and limitation on certain materials, for example, for light and soft polymer films, metal foils, gauze and the like, because the materials are soft, the adhesive tape has the problems of inaccurate adhesive positioning, wrinkling, deflection, bubble generation and the like due to the external force of adhesive tape. Therefore, how to develop an adhesive tape suitable for a light and soft material becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention provides a double-sided adhesive tape which is suitable for bonding light soft materials.
The invention also provides a lithium ion battery which comprises the diaphragm, and the double-sided adhesive tape is adhered on the surface of the diaphragm, so that the technical difficulty that the lithium ion barrier layer cannot be arranged on the diaphragm can be effectively solved.
The invention provides a double-sided tape, which comprises a first bonding layer, a base material layer and a second bonding layer which are sequentially stacked;
the first bonding layer comprises one or more of organic silicon adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives and rubber adhesives, and the bonding strength of the first bonding layer is greater than that of the second bonding layer.
In the double-sided tape, the second adhesive layer may include one or more of silicone adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives, and rubber adhesives.
The thickness of the first bonding layer is 1-20 μm.
The thickness of the second adhesive layer is 1-20 μm as the above double-sided adhesive tape.
As for the double-sided adhesive tape, the base material layer comprises one or more of PI, PP, PE and PET.
The thickness of the base material layer is 3-50 μm.
Like above-mentioned double-sided tape, double-sided tape still includes from the type layer, it is in to set up from the type layer the surface of substrate layer is kept away from to first tie coat, from the type layer for PE from type membrane, PET from type membrane, OPP from type membrane, compound from type membrane, glassine from type paper, CCK from one or more in the type paper.
The thickness of the release layer is 3-100 μm.
The invention provides a lithium ion battery, which comprises a positive plate, a diaphragm and a negative plate, wherein the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector, and a negative lug is arranged on the surface of the negative current collector;
any one of the double-sided adhesive tapes is adhered to the surface of the diaphragm, and the vertical projection area of the negative electrode tab on the diaphragm falls into the vertical projection area of the double-sided adhesive tape on the diaphragm.
As above lithium ion battery, the first adhesive layer of the double-sided tape comprises a hot-melt type and electrolyte-resistant adhesive, and the second adhesive layer comprises a pressure-sensitive type and electrolyte-resistant adhesive.
The implementation of the invention has at least the following advantages:
1. the double-sided adhesive tape provided by the invention comprises two bonding layers, the bonding strength of the first bonding layer is greater than that of the second bonding layer, the double-sided adhesive tape can be effectively and accurately bonded on the surface of a light soft material in an auxiliary adhesive bonding mode of transferring objects, and the problems of wrinkling, poor positioning, bubbles and the like of the adhesive are effectively solved.
2. The double-sided adhesive tape provided by the invention can be used for pasting the diaphragm in the lithium ion battery, and effectively solves the technical difficulty that the lithium ion barrier layer cannot be arranged on the diaphragm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a double-sided adhesive tape according to an embodiment of the present invention;
FIG. 2 is a schematic view of a double-sided tape according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a double-sided tape according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lithium ion battery according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating the use of the double-sided tape in a lithium ion battery according to an embodiment of the present invention.
Description of reference numerals:
1: double-sided adhesive tape;
1-1: a first adhesive layer;
1-2: a substrate layer;
1-3: a second adhesive layer;
1-4: a release layer;
2: transferring the object;
3: an object to be bonded;
101: a positive current collector;
102: a positive electrode active layer;
200: a diaphragm;
301: a negative current collector;
302: a negative electrode active layer;
400: and a negative tab.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem of difficulty in surface gluing of light soft materials, the invention provides a double-sided tape in a first aspect, wherein the double-sided tape comprises a first bonding layer, a substrate layer and a second bonding layer which are sequentially stacked;
the first bonding layer comprises one or more of organic silicon adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives and rubber adhesives, and the bonding strength of the first bonding layer is greater than that of the second bonding layer.
The invention provides a double-sided tape, which is provided with double-sided adhesive layers, wherein the adhesive layer on one surface can be adhered with a transferred object, and the adhesive layer on the other surface of the double-sided tape is adhered to the surface of the object to be adhered by means of the transferred object, wherein the object to be adhered is a light soft material, if the direct adhesive adhering mode is adopted, the problems of inaccurate adhesive adhering positioning, wrinkling, deflection, bubble generation and the like exist, the transferred object is a non-light soft material, the adhering problem does not exist, specifically, figure 1 is a structural schematic diagram of the double-sided tape provided by one embodiment of the invention, as shown in figure 1, the double-sided tape 1 comprises a first adhesive layer 1-1, a base material layer 1-2 and a second adhesive layer 1-3 which are sequentially laminated, the base material layer 1-2 is used as a base body of the double-sided tape 1 and is used for loading the first adhesive layer 1-1 and the second adhesive layer 1-3, the second adhesive layer 1-3 is used for bonding with a transferred object, and is arranged on one surface of the substrate layer 1-2, the first adhesive layer 1-1 is used for bonding with an object to be bonded, and is arranged on the other surface of the substrate layer 1-2, the first adhesive layer 1-1 and the second adhesive layer 1-3 both comprise adhesives, the difference is that the bonding strength of the first adhesive layer 1-1 is greater than that of the second adhesive layer 1-3, the first adhesive layer comprises one or more of silicone adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic acids adhesives and rubber adhesives, and technicians in the field can reasonably select the types of the adhesives and ensure that the bonding strength of the first adhesive layer is greater than that of the second adhesive layer; among the five types of adhesives, some adhesives require external force to release the adhesiveness, such as pressure-sensitive adhesives, hot-melt adhesives, etc., and therefore, the bonding strength of the first adhesive layer defined in the present invention is greater than that of the second adhesive layer, which means that the bonding strength of the first adhesive layer and that of the second adhesive layer are in the final state, i.e., after the bonding process is completed, for example, for some adhesives that can be adhered without external force, the bonding strength of the first adhesive layer is greater than that of the second adhesive layer; or before the external force acts, the bonding strength of the first bonding layer is smaller than that of the second bonding layer, and the viscosity of the bonding agent in the first bonding layer is released under the action of the external force, so that the bonding strength of the first bonding layer is larger than that of the second bonding layer; or the adhesive in the first adhesive layer does not need external force to release viscosity, before the external force acts, the adhesive strength of the adhesive in the second adhesive layer is greater than that of the first adhesive layer, and under the action of the external force, the viscosity of the adhesive in the second adhesive layer is reduced or even lost, so that the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer, and the specific implementation mode can be determined according to the properties of the adhesives used in the first adhesive layer and the second adhesive layer; in the use process of the double-sided tape provided by the invention, the second adhesive layer is adhered to a transfer object, and the first adhesive layer is adhered to the surface of an adhered object with the aid of the transfer object, for example, fig. 2 is a schematic view of the use method of the double-sided tape provided by an embodiment of the invention, as shown in fig. 2, firstly, the second adhesive layer 1-3 is adhered to the surface of the transfer object 2, and then the object 3 to be adhered is adhered to the surface of the first adhesive layer 1-1, because the adhesive strength of the first adhesive layer 1-1 is greater than that of the second adhesive layer 1-3, the adhesion between the first adhesive layer 1-1 and the object 3 to be adhered is firmer, and a person skilled in the art can retain or peel off the second adhesive layer 1-3 according to actual needs to complete the adhesion requirement of the surface of the object to be adhered. The double-sided adhesive tape provided by the invention comprises two adhesive layers, the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer, the adhesive tape can be effectively and accurately adhered to the surface of a soft object in an auxiliary adhesive transferring mode, and the problems of wrinkling, poor positioning, bubbles and the like of light soft material adhesive are effectively solved.
The second adhesive layer may also include one or more of silicone, epoxy, polyurethane, polyacrylic, and rubber adhesives, and those skilled in the art can select the types of the adhesives in the first adhesive layer and the second adhesive layer according to conventional technical means, so that the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer.
In a specific embodiment, the first bonding layer comprises a first pressure-sensitive adhesive, the second bonding layer comprises a second pressure-sensitive adhesive, the first pressure-sensitive adhesive and the second pressure-sensitive adhesive release viscosity under the action of pressure, and after the action of pressure, the bonding strength of the first bonding layer is greater than that of the second bonding layer, in the using process, the second bonding layer is pasted on the surface of a transfer object, the pasting purpose is achieved under the action of pressure, the first bonding layer is pasted on the surface of the object to be pasted, under the action of pressure, the double-sided adhesive tape is pasted on the surface of the object to be pasted, and the adhesion of the double-sided adhesive tape and the object to be pasted is completed.
In another specific embodiment, the first adhesive layer comprises a first pressure-sensitive adhesive, and is solvent-resistant, the second adhesive layer comprises a second pressure-sensitive adhesive, and is solvent-resistant, in the use process, the second adhesive layer is pasted on the surface of the transfer object, and the pasting purpose is achieved under the action of pressure, then the first adhesive layer is pasted on the surface of the object to be pasted under the action of pressure, then the double-sided tape together with the object to be pasted and the transfer object are placed in the solvent, under the soaking of the solvent, the bonding strength of the second adhesive layer is reduced or even lost, the bonding strength of the first adhesive layer is greater than that of the second adhesive layer, and the bonding of the double-sided tape and the object to be pasted is completed.
In a further embodiment, the first adhesive layer comprises a hot-melt adhesive and the second adhesive layer comprises a pressure-sensitive adhesive, the second adhesive layer is adhered to the surface of the transferred object in use and is adhered under pressure, the first adhesive layer is adhered to the surface of the object to be adhered, the first adhesive layer has low adhesive strength, and the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer due to the release of the adhesiveness under the action of heat, so that the adhesion of the double-sided adhesive tape to the object to be adhered is completed.
In another embodiment, the first adhesive layer may also be a photo-curing adhesive, a moisture-based adhesive, or the like, and the function is the same as that described above, i.e. the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer under the action of light and moisture, so as to complete the adhesion of the double-sided adhesive tape to the object to be adhered.
The skilled person can select a suitable binder type and apply the binder to the surface of the substrate layer to obtain a bonding layer, and the substrate layer can comprise materials conventional in the art, and specifically, the substrate layer comprises one or more of PI, PP, PE, and PET.
Further, the thickness of the substrate layer is 3-50 μm.
The adhesive coated on the surface of the substrate layer can be coated with a single layer, a double layer or a plurality of layers, and can be selected by a person skilled in the art according to the actual needs, and the thickness of the first adhesive layer is 1-20 μm.
Like the first adhesive layer, the second adhesive layer may also be coated with a single layer, double layers or multiple layers by an adhesive, the thickness of the second adhesive layer being 1 to 20 μm.
In order to facilitate the use of the double-sided tape, the double-sided tape further comprises a release layer, the release layer is disposed on the surface of the first bonding layer away from the substrate layer, fig. 3 is a schematic structural view of the double-sided tape according to another embodiment of the present invention, as shown in fig. 3, the release layer 1-4 is disposed on the surface of the first bonding layer 1-1 away from the substrate layer 1-2, the release layer 1-4 has no bonding force and is mainly used for protecting the first bonding layer 1-1, and the release layer is one or more of a PE release film, a PET release film, an OPP release film, a composite release film, a glassine release paper, and a CCK release paper.
In the use process, before the first bonding layer 1-1 is bonded with the surface of the object 3 to be bonded, the release layer 1-4 is peeled off from the surface of the first bonding layer 1-1 and then bonded with the object 3 to be bonded.
Further, the thickness of the release layer is 3-100 μm.
In conclusion, the double-sided adhesive tape provided by the invention comprises two adhesive layers, the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer, the adhesive tape can be effectively and accurately adhered to the surface of a light soft material in an auxiliary adhesive pasting mode of transferring objects, and the problems of wrinkling, poor positioning, bubbles and the like of the adhesive pasting are effectively solved.
The fast charge is one of the current development directions of the lithium ion battery, wherein a tab is a metal conductor led out from a pole piece in a lithium ion battery cell, the tab is arranged in the middle to realize the fast charge, and in order to reduce the safety risk caused by lithium precipitation in the cycle process of the lithium ion battery, a lithium ion barrier layer is usually arranged in a region of a vertical projection of a negative electrode tab on a diaphragm, namely, an adhesive tape is pasted on the surface of the diaphragm, but because the diaphragm is made of a light soft material, the problems of adhesive tape wrinkling, position offset and even non-pasting are caused by directly pasting the adhesive tape on the diaphragm, but the double-sided adhesive tape provided by the invention can effectively solve the problems, so the lithium ion battery comprises a positive plate, the diaphragm and a negative plate, the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector, the surface of the negative current collector is provided with a negative lug;
any one of the double-sided adhesive tapes is adhered to the surface of the diaphragm, and the vertical projection area of the negative electrode tab on the diaphragm falls into the vertical projection area of the double-sided adhesive tape on the diaphragm.
The invention provides a lithium ion battery, which comprises a positive plate, a negative plate, a diaphragm arranged between the negative plate and the positive plate, and a negative tab, wherein the double-sided adhesive tape is adhered to the area of the negative tab vertically projected on the diaphragm, specifically, fig. 4 is a structural schematic diagram of the lithium ion battery provided by an embodiment of the invention, as shown in fig. 4, the lithium ion battery comprises the positive plate, the diaphragm 200 and the negative plate, the positive plate comprises a positive current collector 101 and a positive active layer 102 arranged on the surface of the positive current collector, the negative plate comprises a negative current collector 301 and a negative active layer 302 arranged on the surface of the negative current collector, the negative tab 400 is arranged in the middle area of the negative current collector 301, namely, the negative active layers 302 are arranged on the left side and the right side of the negative tab 400, the diaphragm 200 is arranged between the positive plate and the negative plate and is used for isolating the contact of the positive plate and the negative plate, the double-sided tape 1 is adhered to the surface of the diaphragm 200, the vertical projection area of the negative electrode tab 400 on the diaphragm 200 falls into the vertical projection area of the double-sided tape 1 on the diaphragm 200, and the double-sided tape 1 can be used as a lithium ion barrier layer to prevent potential safety hazards caused by lithium precipitation of a negative electrode sheet; when the separator 200 is used as an object to be bonded, a positive plate can be used as a transfer object, for example, fig. 5 is a schematic flow chart of a double-sided tape used in a lithium ion battery according to an embodiment of the present invention, as shown in fig. 5, first, the second adhesive layer 1-3 in the double-sided tape 1 is adhered to the surface of the positive plate, then, the positive plate, the separator, and the negative plate are prepared according to a lamination process or a winding process to obtain a battery cell, and after the battery cell is prepared, the first adhesive layer 1-1 in the double-sided tape 1 is adhered to the surface of the separator 200 to complete the adhering process between the double-sided tape and the separator.
When double-sided tape includes from the type layer, like in the above-mentioned lithium ion battery preparation process, after positive plate preparation is accomplished, need peel off from the double-sided tape surface from the type layer, otherwise in later stage lithium ion battery's preparation process, can break away from the type layer from first adhesive linkage surface automatically, influence lithium ion battery's preparation, but the first tie coat that leaks is bare pastes to the diaphragm easily in the preparation process, cause the regional dislocation of pasting, cause inconvenient for lithium ion battery preparation, consequently, for the ease of lithium ion battery's preparation and double-sided tape's bonding, double-sided tape's first tie coat includes hot melt type and electrolyte resistant type binder, and the second tie coat includes pressure sensitive type and electrolyte resistant type binder not.
The hot-melt electrolyte-resistant adhesive does not have viscosity at normal temperature, releases viscosity after heat treatment, does not change when being soaked in electrolyte, and can be specifically a polyolefin rubber adhesive; the pressure-sensitive adhesive releases viscosity under the action of pressure, and can swell and lose viscosity after being soaked in electrolyte, so that the double-sided adhesive tape falls off from the surface of the positive plate, and can be polyacrylic acid or high-swelling pressure-sensitive rubber.
In the specific use process, firstly, the area of the surface of the diaphragm, to which the double-sided tape needs to be adhered, is determined, then the adhesive-attaching mechanism winds the release layer and performs centralized recovery, and then the second adhesive layer is adhered to the surface of the positive plate, so that the adhering position of the double-sided tape corresponds to the position of the surface of the diaphragm, to which the double-sided tape needs to be adhered, and as the binder in the first adhesive layer does not have viscosity, the double-sided tape adhered to the surface of the positive plate cannot influence the positive rolled plate, and meanwhile, the adsorption of dust can be reduced, and the influence on the safety performance of the lithium ion battery is avoided; then preparing the positive plate, the diaphragm and the negative plate into a battery cell by adopting a lamination process or a winding process, and carrying out hot pressing on the battery cell at the hot pressing temperature of 30-90 ℃, wherein in the hot pressing process, the viscosity of the binder in the first bonding layer is released and is bonded with the diaphragm; and finally, injecting electrolyte into the battery core after packaging, wherein the electrolyte enables the binder in the second bonding layer to have a swelling effect, so that the viscosity is lost or greatly reduced, and the viscosity of the binder in the first bonding layer cannot be reduced, so that the double-sided adhesive tape falls off from the surface of the positive plate and is adhered to the required position of the surface of the diaphragm. The binder may be selected by those skilled in the art according to the kind of the electrolyte, and the present invention is not limited thereto.
In conclusion, the double-sided adhesive tape provided by the invention can be used for pasting the diaphragm in the lithium ion battery, and effectively solves the technical difficulty that the lithium ion barrier layer cannot be arranged on the diaphragm.
The technical scheme provided by the invention is explained in detail by combining the specific embodiments as follows:
example 1
The double-sided tape that this embodiment provided is including the second tie coat, substrate layer, first tie coat and the release layer that stack gradually the setting, wherein:
the base material layer is a PET layer with the thickness of 12 mu m;
the second adhesive layer is obtained by polymerizing 40 parts by mass of hard monomer (VAc/LMA), 60 parts by mass of soft monomer (2-EHA/BA) and 0.5 part by mass of initiator, and is a hot-melt type electrolyte-resistant adhesive;
the thickness of the second bonding layer is 4 μm;
the first adhesive layer is obtained by polymerizing 20 parts by mass of polystyrene, 15 parts by mass of polydiene, 15 parts by mass of styrene-butadiene copolymer, 8 parts by mass of petroleum resin, 3 parts by mass of filler and 0.6 part by mass of initiator, and is pressure-sensitive and electrolyte-intolerant;
the thickness of the first bonding layer is 4 μm;
the release layer is a PE release film with the thickness of 50 μm.
The double-sided adhesive tape is adhered to the surface of the positive plate by the method, the positive plate, the diaphragm and the negative plate are assembled into a battery core, the battery core is packaged and injected with electrolyte (EC: PC: EMC: DEC: 1: 1: 1: 1) to prepare the lithium ion battery, the lithium ion battery is hot-pressed at 80 ℃, the lithium ion battery is disassembled after the hot pressing is finished, the position of the double-sided adhesive tape is observed, and the observation result shows that the double-sided adhesive tape is adhered to the corresponding position of the diaphragm and is stripped from the surface of the positive plate.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A double-sided tape is characterized by comprising a first bonding layer, a base material layer and a second bonding layer which are sequentially stacked;
the first bonding layer comprises one or more of organic silicon adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives and rubber adhesives, and the bonding strength of the first bonding layer is greater than that of the second bonding layer.
2. The double-sided tape of claim 1, wherein the second adhesive layer comprises one or more of silicone, epoxy, polyurethane, polyacrylic, rubber based adhesives.
3. The double-sided tape according to claim 1, wherein the thickness of the first adhesive layer is 1 to 20 μm.
4. The double-sided tape according to claim 2, wherein the thickness of the second adhesive layer is 1 to 20 μm.
5. The double-sided tape of claim 1, wherein the substrate layer comprises one or more of PI, PP, PE, PET.
6. The double-sided tape according to claim 5, wherein the thickness of the base material layer is 3 to 50 μm.
7. The double-sided tape of claim 1, further comprising a release layer disposed on the surface of the first adhesive layer away from the substrate layer, wherein the release layer is one or more of a PET release film, an OPP release film, a composite release film, a glassine release paper, and a CCK release paper.
8. The double-sided tape according to claim 7, wherein the release layer has a thickness of 3 to 100 μm.
9. The lithium ion battery is characterized by comprising a positive plate, a diaphragm and a negative plate, wherein the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector, and a negative lug is arranged on the surface of the negative current collector;
the double-sided adhesive tape of any one of claims 1 to 8 is adhered to the surface of the separator, and the vertical projection area of the negative electrode tab on the separator falls within the vertical projection area of the double-sided adhesive tape on the separator.
10. The lithium ion battery of claim 9, wherein the first adhesive layer of the double-sided tape comprises a hot-melt and electrolyte-resistant adhesive and the second adhesive layer comprises a pressure-sensitive and electrolyte-less adhesive.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111123544.3A CN113683974A (en) | 2021-09-24 | 2021-09-24 | Double-sided adhesive tape and lithium ion battery |
| PCT/CN2022/120957 WO2023046090A1 (en) | 2021-09-24 | 2022-09-23 | Double-sided adhesive tape and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111123544.3A CN113683974A (en) | 2021-09-24 | 2021-09-24 | Double-sided adhesive tape and lithium ion battery |
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| CN113683974A true CN113683974A (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111123544.3A Pending CN113683974A (en) | 2021-09-24 | 2021-09-24 | Double-sided adhesive tape and lithium ion battery |
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| Country | Link |
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| CN (1) | CN113683974A (en) |
| WO (1) | WO2023046090A1 (en) |
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| CN114479720A (en) * | 2022-02-25 | 2022-05-13 | 东莞澳中新材料科技股份有限公司 | Adhesive capable of being debonded in electrolyte and double-sided adhesive tape applying same |
| CN114958230A (en) * | 2022-06-14 | 2022-08-30 | 东莞澳中新材料科技股份有限公司 | Double-sided hot melt adhesive tape with multilayer structure and lithium ion battery applying same |
| WO2023046090A1 (en) * | 2021-09-24 | 2023-03-30 | 珠海冠宇电池股份有限公司 | Double-sided adhesive tape and lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023046090A1 (en) * | 2021-09-24 | 2023-03-30 | 珠海冠宇电池股份有限公司 | Double-sided adhesive tape and lithium ion battery |
| CN114479720A (en) * | 2022-02-25 | 2022-05-13 | 东莞澳中新材料科技股份有限公司 | Adhesive capable of being debonded in electrolyte and double-sided adhesive tape applying same |
| CN114479720B (en) * | 2022-02-25 | 2024-03-19 | 东莞澳中新材料科技股份有限公司 | Adhesive capable of losing viscosity in electrolyte and double-sided tape using same |
| CN114958230A (en) * | 2022-06-14 | 2022-08-30 | 东莞澳中新材料科技股份有限公司 | Double-sided hot melt adhesive tape with multilayer structure and lithium ion battery applying same |
| CN114958230B (en) * | 2022-06-14 | 2023-11-03 | 东莞澳中新材料科技股份有限公司 | Double-sided hot melt adhesive tape with multilayer structure and lithium ion battery using same |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023046090A1 (en) | 2023-03-30 |
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