WO2017197551A1 - 一种提高电池抗跌落性能的胶粘带及其制作方法 - Google Patents

一种提高电池抗跌落性能的胶粘带及其制作方法 Download PDF

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Publication number
WO2017197551A1
WO2017197551A1 PCT/CN2016/082168 CN2016082168W WO2017197551A1 WO 2017197551 A1 WO2017197551 A1 WO 2017197551A1 CN 2016082168 W CN2016082168 W CN 2016082168W WO 2017197551 A1 WO2017197551 A1 WO 2017197551A1
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WIPO (PCT)
Prior art keywords
layer
adhesive
sensitive adhesive
pressure sensitive
battery
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PCT/CN2016/082168
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English (en)
French (fr)
Inventor
王升
陆金亮
王宜金
陈鹏
王杰
尹嘉菲
Original Assignee
东莞市澳中电子材料有限公司
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Application filed by 东莞市澳中电子材料有限公司 filed Critical 东莞市澳中电子材料有限公司
Priority to PCT/CN2016/082168 priority Critical patent/WO2017197551A1/zh
Publication of WO2017197551A1 publication Critical patent/WO2017197551A1/zh

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Classifications

    • 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
    • C09J157/00—Adhesives based on unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C09J157/02—Copolymers of mineral oil hydrocarbons
    • 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
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • 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
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • 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

Definitions

  • the invention relates to an adhesive tape, in particular to an adhesive tape capable of improving the drop resistance of a battery and a manufacturing method thereof.
  • Rechargeable batteries especially lithium batteries
  • They can be recycled many times due to their high energy density. They have long life and low pollution, and are widely used in mobile phones and notebooks. With the improvement of technology, the requirements for lithium batteries in various fields are getting higher and higher. Among them, the requirements for the anti-drop performance of lithium batteries are very high. The anti-drop performance of lithium batteries determines the stability and safety of lithium batteries.
  • the crush resistance of lithium batteries is mainly determined by the conformability of the battery pole group and the outer packaging material. If the battery pole group and the outer packaging material have poor fit, when the battery is subjected to horizontal or vertical movement, the battery pole group and the outer package The material will have relative motion. In severe cases, the battery pole group will be deformed, resulting in battery short circuit, open circuit, etc., which will bring the battery to fire, explosion and other dangers.
  • the outer packaging material of the lithium battery mainly selects an aluminum plastic film, and the aluminum plastic film is composed of a three-layer structure of CPP, AL, and nylon, wherein the surface of the battery is CPP material.
  • the lithium battery pole group is mainly composed of a positive electrode material, a separator film, a negative electrode material, a positive electrode tab and a negative electrode tab.
  • the main function of the separator is to isolate the cathode material and the anode material to prevent the cathode and the anode from contacting, thereby causing the battery to be short-circuited. jobs.
  • a company has introduced an oriented polystyrene tape for the bonding of aluminum plastic film and battery electrode group for lithium battery, but the tape has small adhesion to aluminum plastic film and battery pole group, and needs to be used in lithium battery.
  • a large area of polystyrene tape can meet the drop resistance of lithium batteries, resulting in a decrease in battery energy density.
  • the tape is composed of four layers, which are respectively a first adhesive layer (having a viscosity at room temperature), a substrate layer, and a second layer. a layer of adhesive (oriented polystyrene) and a protective layer, the first adhesive layer of the tape bonding the outer surface of the battery pole group, The protective layer reacts with the electrolyte after encountering the electrolyte of the lithium battery, so that the second adhesive layer is exposed, and the second adhesive layer is bonded to the inner surface of the battery casing, and the total thickness of the adhesive tape is about 50 ⁇ m.
  • the above tapes have the following disadvantages: (1) the overall thickness of the tape is thick, which affects the energy density of the lithium battery to some extent; (2) the protective layer mentioned in the tape reacts with the electrolyte for the lithium battery. It has an unpredictable effect on the overall performance of the battery; (3) The oriented polystyrene used in the tape has poor adhesion to the inner surface of the outer casing, and the area used in the battery is large.
  • the present application aims to provide an adhesive tape for improving the drop resistance of a battery and a manufacturing method thereof, which can reduce the relative movement of the battery pole group and the outer casing caused by vibration, drop, etc. of the lithium ion battery, thereby avoiding the battery. A bad accident occurred.
  • the thickness of the tape needs to be reduced to less than 35um to increase the energy density of the battery
  • the material used in the tape shall not react with the electrolyte, and it shall not react when the battery is charged or discharged, and does not affect the service life of the battery;
  • the invention provides an adhesive tape capable of improving the drop resistance of a battery, and has a total five-layer structure.
  • One layer is a pressure sensitive adhesive having a bonding property at normal temperature, and is used for bonding the outer surface of the battery pole group, the bonding material may be metal or plastic;
  • the second layer is a substrate;
  • the third layer is a primer coating for Bonding the substrate and the fourth layer;
  • the fourth layer is an adhesive layer for bonding the inner surface of the battery case to bond metal or plastic;
  • the fifth layer is a double-sided release film for preventing the When the adhesive tape is made into a roll material, the first pressure sensitive adhesive layer is bonded to the fourth adhesive layer.
  • the pressure sensitive adhesive is a kind of adhesive with sensitivity to pressure, and is mainly used for preparing pressure sensitive adhesive tape.
  • the pressure sensitive adhesive can be divided into rubber type and resin type according to the main resin component, and the rubber type can be further divided into two types. Natural rubber and synthetic rubber, resin type mainly includes acrylic, silicone and polyurethane.
  • the pressure sensitive adhesive of the first layer is composed of an acrylate adhesive and has a coating thickness of 2 to 4 um;
  • the acrylate adhesive is a polyolefin rubber elastomer with a special functional group, and the acrylate resin is used for the acrylate resin.
  • the modification method is: crosslinking the functional group in the acrylic resin and the functional group in the polyolefin rubber by adding a curing agent (such as an aziridine curing agent, a polyurethane curing agent, an epoxy curing agent, etc.) to thereby make the acrylate pressure
  • a curing agent such as an aziridine curing agent, a polyurethane curing agent, an epoxy curing agent, etc.
  • the acrylate adhesive includes various components in the following mass ratios:
  • the polyolefin rubber I has a carboxyl functional group and has a molecular weight of 0.5 to 10,000; the polyolefin rubber II has a maleic anhydride functional group and a molecular weight of 0.5 to 10,000. Both are commercially available.
  • the pressure sensitive adhesive of the first layer may also be a SIS (styrene-isoprene-styrene block copolymer) pressure sensitive adhesive with a coating thickness of 5-10 um; the SIS pressure sensitive
  • the main feature of glue is not to make A softening oil, such as naphthenic oil, rubber oil, etc., is mainly used to improve the initial viscosity of the pressure sensitive adhesive by a low molecular weight polyolefin rubber and a liquid resin.
  • SIS styrene-isoprene-styrene block copolymer
  • SIS rubber elastomer I has a molecular weight of 50,000 to 100,000, and SIS rubber elastomer II has a molecular weight of 100,000 to 200,000, both of which are commercially available; polyolefin rubber I has a carboxyl functional group and a molecular weight of 0.5 to 10,000; Rubber II has a maleic anhydride functional group with a molecular weight of 0.5 to 10,000; both are commercially available; liquid petroleum resin has a molecular weight of 0.1 to 0.3 million, and hydrogenated petroleum resin has a molecular weight of 0.2 to 0.5 million, both of which are commercially available.
  • the peroxide-based initiator contains a compound of a peroxy group (—O—O—), which is broken by the —O—O— bond and is split into two corresponding radicals to initiate polymerization of the monomer.
  • the peroxide initiator is classified into two types: an inorganic peroxide and an organic peroxide.
  • the inorganic peroxide initiator includes hydrogen peroxide, ammonium persulfate or potassium persulfate; and the organic peroxide initiator includes benzene peroxide.
  • Formyl, benzoyl peroxide, methyl ethyl ketone or the like can initiate polymerization of an unsaturated polyester, vulcanization of a rubber, or polymerization of an ethylenic monomer such as vinyl chloride or styrene.
  • the second layer substrate has a thickness of 2 to 12 um, and the substrate type includes PP (polypropylene). PA (polyamide) or PET (polyethylene terephthalate), the specific substrate type is not limited, but the thickness does not exceed 12um.
  • the third primer is a SIS (styrene-isoprene-styrene block copolymer) pressure sensitive adhesive
  • the SIS styrene-isoprene used in the first layer
  • the styrene block copolymer is uniform in pressure-sensitive adhesive and has a coating thickness of 2 to 4 um.
  • the fourth adhesive layer is a SEBS (hydrogenated styrene-butadiene-styrene block copolymer) having a styrene molecular segment content of 30 to 40%, and a coating thickness of 2 to 4 um.
  • SEBS is a linear tri-doped copolymer in which an ethylene-butene copolymer obtained by hydrogenating polybutadiene is an intermediate elastic block, which is a terminal section of polystyrene. SEBS does not contain unsaturated double bonds and therefore has good stability and aging resistance.
  • the fifth adhesive layer is a double-sided release film, and the film may be PET, BOPP, or a double-sided silicon-free release film, and the thickness is not required.
  • the adhesives used in the first and third layers of the above adhesive tape are not limited to the special acrylate adhesive and the special SIS adhesive, and other types of pressure sensitive adhesives may also be used. However, in order to be used in a lithium battery, it is not allowed to physically dissolve and chemically react with the electrolyte for the lithium battery, resulting in a change in the performance of the lithium battery.
  • the protective layer adhesive used for the fourth layer of the above adhesive tape is not limited to the use of SEBS, as long as it is coated on the third adhesive layer, and can be bonded tightly to the third adhesive layer, and The fourth layer of adhesive layer is non-tacky at normal temperature, and the inner surface of the lithium battery case can be bonded after high temperature or high pressure.
  • the first pressure sensitive adhesive has a strong adhesiveness to the battery electrode group under a slight pressure at a normal temperature
  • the pressure sensitive adhesive is rubber-modified acrylate glue for bonding.
  • the material has a good sealing property and will not be wetted and destroyed by the lithium battery electrolyte; the same effect is also obtained by using a special SIS pressure sensitive adhesive.
  • the invention applies for an adhesive tape, and the fourth layer is not viscous under 60 ° C, and needs to be at 60 ° C or higher, and a pressure of 0.5 MPa or more is applied to the lithium battery casing. Strong cohesiveness, and the material has stable chemical properties, and the lithium battery is resistant to electrolytes and does not react with lithium battery electrolyte.
  • the manufacturing method of the adhesive tape for improving the drop resistance of the battery described in the present application is as follows:
  • the SEBS which is a non-stick adhesive at room temperature, forms a normal temperature non-stick adhesive layer and is wound into a roll;
  • the base film to the base film unwinding roller, add the special SIS pressure sensitive adhesive to the transfer knife coater, and add the special acrylate pressure sensitive adhesive or special SIS pressure sensitive adhesive to the extrusion coating machine.
  • a double-sided silicon-free release film with a normal temperature non-stick sealant layer is attached to the release film unwinding roll; wherein the extrusion coater is provided with a precise metering type metering pump, which is mainly for ensuring the output glue
  • the precision of the coating makes the coating precision improve.
  • the coating thickness accuracy of the extrusion coating machine can be controlled at about 0.5um;
  • the base film with the third layer of special SIS pressure-sensitive adhesive layer and the double-sided silicon-free release film with normal temperature and non-adhesive sealant layer are fed into the release film laminating device to make the third layer special SIS pressure
  • the sensitive adhesive layer is adhered to the fourth layer of normal temperature non-sticky SEBS adhesive layer;
  • the base film is sent to an extrusion coater, and the extrusion coater coats the other side of the base film with a special acrylate pressure sensitive adhesive or a special SIS pressure sensitive adhesive. Forming a first layer of a pressure sensitive adhesive layer;
  • the base film is sent to the winding device for winding, and the finished product is obtained.
  • the overall thickness of the tape is reduced to 16 to 35 um, which can be reduced inside the battery. Take up space and increase battery energy density;
  • the adhesive tape has strong adhesion to the battery pole group and the outer casing, and the use area inside the battery can be reduced, thereby increasing the energy density of the battery;
  • the tape fixes the battery pole group and the battery casing, it can prevent the battery from being short-circuited or disconnected after the battery pole group is protected from the battery casing due to vibration or falling.
  • the pressure sensitive adhesive with viscous flow characteristics is used on both sides of the tape, and the vibration energy is absorbed when the battery is subjected to a certain impact, thereby protecting the battery pole group from damage.
  • an adhesive tape capable of improving the drop resistance of a battery, having a five-layer structure, from the most close to the battery pole group, followed by a pressure sensitive adhesive, a substrate, a primer, an adhesive layer and a double-sided release film.
  • the first pressure sensitive adhesive is composed of an acrylate adhesive and has a coating thickness of 2 um
  • the acrylate adhesive comprises various components of the following mass ratio: 1.
  • Polyolefin rubber I 20 parts 2, polyolefin rubber II: 5 parts, 3, acrylic resin: 60 parts; 4, aziridine curing agent: 1 part; the second layer of substrate is PP, the thickness is 2um; the third layer of primer It is a SIS (styrene-isoprene-styrene block copolymer) pressure-sensitive adhesive with a coating thickness of 2 ⁇ m; various components including the following parts by mass: 1.
  • the fourth layer of adhesive layer is made of SEBS (hydrogenated styrene-butadiene-styrene block copolymer) having a styrene molecular segment content of 30-40%, coated thick 2um; Adhesive layer The fifth layer is a PET bis Face release film, thickness 36um.
  • SEBS hydrogenated styrene-butadiene-styrene block copolymer
  • polyolefin rubber I has a carboxyl functional group with a molecular weight of 0.5 to 10,000; polyolefin rubber II has a maleic anhydride functional group with a molecular weight of 0.5 to 10,000; SIS rubber elastomer I has a molecular weight of 50,000 to 100,000, and SIS rubber elastomer II has a molecular weight of 100,000 to 200,000, a liquid petroleum resin has a molecular weight of 0.1 to 0.3 million, and a hydrogenated petroleum resin has a molecular weight of 0.2 to 0.5 million, which are commercially available.
  • the above adhesive tape is produced as follows:
  • the adhesive adhesive SEBS forms a normal temperature non-stick adhesive layer and is wound into a roll;
  • the base film with the third layer of special SIS pressure-sensitive adhesive layer and the release film with normal temperature non-adhesive sealant layer are fed into the release film laminating device, so that the third layer of special SIS pressure-sensitive adhesive layer and The fourth layer of normal temperature non-stick SEBS adhesive layer is laminated;
  • the base film is sent to an extrusion coater, and the extrusion coater coats the other side of the base film with a special acrylate pressure sensitive adhesive or a special SIS pressure sensitive adhesive. Forming a first layer of a pressure sensitive adhesive layer;
  • the base film is sent to the winding device for winding, and the finished product is obtained.
  • an adhesive tape capable of improving the drop resistance of a battery, having a five-layer structure, from the most close to the battery pole group, followed by a pressure sensitive adhesive, a substrate, a primer, an adhesive layer and a double-sided release film.
  • the first pressure sensitive adhesive is composed of an acrylate adhesive and has a coating thickness of 4 um
  • the acrylate adhesive comprises various components of the following mass ratio: 1.
  • Polyolefin rubber I 30 parts 2, polyolefin rubber II: 10 parts, 3, acrylic resin: 70 parts; 4, polyurethane curing agent: 2 parts; the second layer substrate is PA (polyamide) substrate, thickness 12um; third The primer is a SIS (styrene-isoprene-styrene block copolymer) pressure sensitive adhesive with a coating thickness of 4 um; various components including the following parts by mass: 1.
  • the fourth layer of adhesive layer uses SEBS (hydrogenated styrene-butadiene-styrene) having a styrene molecular segment content of 30-40% Block copolymers), the coating thickness of 4um; the fifth layer Adhesive layer PET 36um sided release film.
  • SEBS hydrogenated styrene-butadiene-styrene
  • polyolefin rubber I has a carboxyl functional group with a molecular weight of 0.5 to 10,000; polyolefin rubber II has a maleic anhydride functional group with a molecular weight of 0.5 to 10,000; SIS rubber elastomer I has a molecular weight of 50,000 to 100,000, and SIS rubber elastomer II has a molecular weight of 100,000 to 200,000, a liquid petroleum resin has a molecular weight of 0.1 to 0.3 million, and a hydrogenated petroleum resin has a molecular weight of 0.2 to 0.5 million, which are commercially available.
  • the above adhesive tape is produced as follows:
  • the base film with the third layer of special SIS pressure-sensitive adhesive layer and the release film with normal temperature non-adhesive sealant layer are fed into the release film laminating device, so that the third layer of special SIS pressure-sensitive adhesive layer and The fourth layer of normal temperature non-stick SEBS adhesive layer is laminated;
  • the base film is sent to an extrusion coater, and the extrusion coater coats the other side of the base film with a special acrylate pressure sensitive adhesive or a special SIS pressure sensitive adhesive. Forming a first layer of a pressure sensitive adhesive layer;
  • the base film is sent to the winding device for winding, and the finished product is obtained.
  • an adhesive tape capable of improving the drop resistance of a battery, having a five-layer structure, from the most close to the battery pole group, followed by a pressure sensitive adhesive, a substrate, a primer, an adhesive layer and a double-sided release film.
  • the first pressure sensitive adhesive is composed of an acrylate adhesive and has a coating thickness of 3 um
  • the acrylate adhesive comprises various components of the following mass ratio: 1.
  • Polyolefin rubber I 26 parts 2, polyolefin rubber II: 7 parts, 3, acrylic resin: 65 parts; 4, epoxy curing agent: 1.5 parts; the second layer substrate is PET (polyethylene terephthalate) based The thickness of the material is 8 um; the third layer of the undercoat is SIS (styrene-isoprene-styrene block copolymer) pressure sensitive adhesive, and the coating thickness is 3 um; the following components are included in the following parts by mass: 1. SIS rubber elastomer I 20 parts, 2, SIS rubber elastomer II 30 parts, 3, polyolefin rubber I 26 parts, 4, polyolefin rubber II 7 parts, 5, liquid petroleum resin 15 parts, 6, hydrogenated petroleum 24 parts of resin, 7.
  • the fourth layer of adhesive layer uses SEBS (hydrogenated styrene) with a styrene molecular segment content of 30-40% Diene - styrene block copolymer), a coating thickness 3um; the fifth layer Adhesive layer PET 36um sided release film.
  • SEBS hydrogenated styrene
  • polyolefin rubber I has a carboxyl functional group with a molecular weight of 0.5 to 10,000; polyolefin rubber II has a maleic anhydride functional group with a molecular weight of 0.5 to 10,000; SIS rubber elastomer I has a molecular weight of 50,000 to 100,000, and SIS rubber elastomer II has a molecular weight of 100,000 to 200,000, a liquid petroleum resin has a molecular weight of 0.1 to 0.3 million, and a hydrogenated petroleum resin has a molecular weight of 0.2 to 0.5 million, which are commercially available.
  • the BOPP release film is a search film that is coated with a layer of silicone oil on the surface of the BOPP film, which can be easily separated from the pressure sensitive adhesive.
  • BOPP is the abbreviation of "Biaxially Oriented Polypropylene", which is a biaxially oriented polypropylene film. It is produced by first making a melt of high molecular polypropylene into a sheet or a thick film through a narrow machine head, and then in a special stretching machine. Internally, at a certain temperature and set speed, simultaneously or stepwise in two directions (longitudinal, transverse) in the vertical direction, and subjected to appropriate cooling or heat treatment or special processing (such as corona, Coating, etc.).
  • the above adhesive tape is produced as follows:
  • SEBS a normal temperature non-stick adhesive
  • Adhesive SEBS forming a normal temperature non-adhesive adhesive layer, and collecting into a roll;
  • the base film with the third layer of special SIS pressure-sensitive adhesive layer and the release film with normal temperature non-adhesive sealant layer are fed into the release film laminating device, so that the third layer of special SIS pressure-sensitive adhesive layer and The fourth layer of normal temperature non-stick SEBS adhesive layer is laminated;
  • the base film is sent to an extrusion coater, and the extrusion coater coats the other side of the base film with a special acrylate pressure sensitive adhesive or a special SIS pressure sensitive adhesive. Forming a first layer of a pressure sensitive adhesive layer;
  • the base film is sent to the winding device for winding, and the finished product is obtained.
  • the pressure sensitive adhesive of the first layer is also a SIS (styrene-isoprene-styrene block copolymer) pressure sensitive adhesive, and the coating thickness is 7 um, including the following components of the following mass parts: SIS rubber elastomer I 20 parts, 2, SIS rubber elastomer II 25 parts, 3, polyolefin rubber I 26 parts, 4, polyolefin rubber II 7 parts, 5, liquid petroleum resin 15 parts, 6, hydrogenated petroleum resin 22 Parts, 7, methyl ethyl ketone peroxide 0.6 parts; the second layer substrate is PP (polypropylene) substrate, the thickness is 6um; the third layer of primer is SIS (styrene-isoprene-styrene embedded Segment copoly
  • polyolefin rubber I has a carboxyl functional group with a molecular weight of 0.5 to 10,000; polyolefin rubber II has a maleic anhydride functional group with a molecular weight of 0.5 to 10,000; SIS rubber elastomer I has a molecular weight of 50,000 to 100,000, and SIS rubber elastomer II has a molecular weight of 100,000 to 200,000, a liquid petroleum resin has a molecular weight of 0.1 to 0.3 million, and a hydrogenated petroleum resin has a molecular weight of 0.2 to 0.5 million, which are commercially available.
  • the above adhesive tape is produced as follows:
  • the base film is fed into an extrusion coater, and the extrusion coater applies an ESI pressure sensitive adhesive on the other side of the base film by using an extrusion coating head to form a first pressure sensitive adhesive layer.
  • the base film is sent to the winding device for winding, and the finished product is obtained.
  • the adhesive tape for improving the drop resistance of the battery according to the application of the present invention has a total thickness of 16 to 35 um, and the material used does not react with the electrolyte, and mainly depends on heating or pressurizing the battery pole group and the outer casing.
  • the inner surface is cohesive and has a high bonding strength, and a small area in the battery can achieve a satisfactory effect.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

本发明申请提供一种能够提高电池抗跌落性能的胶粘带及其制备方法，所述胶粘带包括五层结构，第一层为常温具有粘结性的压敏胶，用于粘结电池极组的外表面；第二层为基材；第三层为底涂胶，用于粘结基材和第四层；第四层为胶黏层，用于粘结电池外壳的内表面；第五层为双面离型膜。所述的提高电池抗跌落性能的胶粘带，总厚度为16～35um，并且所使用的材料不会跟电解液发生反应，主要靠加热或加压的方式对电池极组和外壳内表面产生粘结性，并且粘结强度高，在电池中使用很小的面积就能达到满意的效果。

Description

一种提高电池抗跌落性能的胶粘带及其制作方法 技术领域
本发明申请涉及一种胶粘带，特别是一种能够提高电池抗跌落性能的胶粘带及其制作方法。
背景技术
可充电电池，特别是锂电池由于其能量密度高，可多次循环使用，其寿命长、污染小，广泛使用在手机、笔记本等领域。随着科技的提高，各领域对锂电池要求越来越高，其中对锂电池的抗摔性能提出了很高的要求，锂电池的抗摔性能决定着锂电池的稳定性和安全性。
锂电池抗摔性主要是由电池极组与外包装材料的贴合性决定，若电池极组与外包装材料贴合性不好，当电池受到水平或者垂直运动时，电池极组和外包装材料就会有相对的运动，严重时会造成电池极组变形导致电池短路，断路等情况，这将会带来电池着火、爆炸等危险。锂电池的外包装材料主要选择铝塑膜，铝塑膜由CPP、AL、尼龙三层结构构成，其中靠电池极组面的为CPP材料。锂电池极组主要由正极材料、隔离膜、负极材料、正极极耳、负极极耳组成，其中隔离膜的主要作用是将正极材料和负极材料隔离，防止正极和负极接触，从而导致电池短路无法工作。目前某公司推出了一款取向聚苯乙烯胶带用于锂电池用铝塑膜和电池极组的粘结，但是该胶带对铝塑膜及电池极组粘结性小，需要在锂电池中使用大面积的聚苯乙烯胶带才能满足锂电池的抗跌落性能，导致电池能量密度下降。
现有技术中，有文献报道了一款用于提高电池抗跌落性能的取向聚苯乙烯胶带，该胶带由四层构成，分别为第一胶层(常温有粘性)、基材层、第二胶层(取向聚苯乙烯)和保护层，该胶带的第一胶层粘结电池极组的外表面，保 护层在遇到锂电池电解液后会跟电解液反应掉，从而使第二胶层露出，第二胶层便粘结了电池外壳的内面，该胶带总厚度在50um左右。上述胶带存在以下几个方面的缺点：(1)胶带总体厚度较厚，在一定程度上影响了锂电池的能量密度；(2)胶带中提到的保护层会跟锂电池用电解液发生反应，对电池整体性能起到不可预测性的影响；(3)该胶带使用的取向聚苯乙烯对外壳内表面粘结性较差，在电池中使用的面积较大。
针对锂电池市场的要求，需要提供一款粘结力更强，在电池中使用面积更小的一种胶带，不仅能够提高锂电池的抗跌落性能，还不能影响锂电池的其他性能。
发明内容
针对上述问题，本发明申请旨在提供一种提高电池抗跌落性能的胶粘带及其制作方法，能够降低锂离子电池因振动、跌落等造成的电池极组和外壳的相对移动，从而避免电池发生不良事故。
本发明申请主要需要解决的问题为：
(1)胶带厚度需要减薄至35um以下，用来提高电池能量密度；
(2)胶带所用材料不得与电解液发生反应，并且也不能在电池充放电时发生反应，不影响电池使用寿命；
(3)胶带对电池极组和外壳内表面的粘结力要强，需要在电池内使用的面积减少，从而提高电池能量密度。
(4)彻底解决电池因跌落造成不良事故的问题。
本发明申请采用的技术方案如下：
本发明申请提供一种能够提高电池抗跌落性能的胶粘带，共五层结构，第 一层为常温具有粘结性的压敏胶，用于粘结电池极组的外表面，粘结材料可以为金属或塑料；第二层为基材；第三层为底涂胶，用于粘结基材和第四层；第四层为胶黏层，用于粘结电池外壳的内表面，可以粘结金属或塑料；第五层为双面离型膜，用来防止将所述胶粘带做成卷状物料时，第一层压敏胶层跟第四层胶黏层发生粘结。
所述的压敏胶是一类具有对压力有敏感性的胶粘剂，主要用于制备压敏胶带，压敏胶按照主体树脂成分可分为橡胶型和树脂型两类，橡胶型又可分为天然橡胶和合成橡胶类，树脂型又主要包括丙烯酸类、有机硅类以及聚氨酯类。
进一步的，所述第一层的压敏胶由丙烯酸酯胶黏剂构成，涂布厚度为2～4um；所述丙烯酸酯胶黏剂使用了特殊官能团的聚烯烃橡胶弹性体对丙烯酸酯树脂进行改性，其中特殊的官能团包括羟基、羧基、环氧基、马来酸酐。改性方法为：通过加入固化剂(如氮丙啶固化剂、聚氨酯固化剂、环氧固化剂等)将丙烯酸树脂中的官能团和聚烯烃橡胶中的官能团进行交联连接，从而使丙烯酸酯压敏胶具有了聚烯烃橡胶的特性。
所述的丙烯酸酯胶黏剂，包括如下质量比的各种组分：
Figure PCTCN2016082168-appb-000001
其中，聚烯烃橡胶I，具有羧基官能团，分子量0.5～1万；聚烯烃橡胶II，具有马来酸酐官能团，分子量0.5～1万。二者均市售可得。
可选择的，所述第一层的压敏胶也可以为SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，涂布厚度为5～10um；所述SIS压敏胶主要特点是不使 用软化油，如环烷油、橡胶油等，其主要是靠低分子量的聚烯烃橡胶和液体树脂来提高该压敏胶的初粘。
进一步的，所述的SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，包括以下质量份的各种组分：
Figure PCTCN2016082168-appb-000002
其中，SIS橡胶弹性体I的分子量5～10万，SIS橡胶弹性体II分子量10～20万，二者均市售可得；聚烯烃橡胶I，具有羧基官能团，分子量0.5～1万；聚烯烃橡胶II，具有马来酸酐官能团，分子量0.5～1万；二者均市售可得；液体石油树脂分子量0.1～0.3万，氢化石油树脂分子量0.2～0.5万，二者均市售可得。
更进一步的，过氧化物类引发剂含有过氧基(—O—O—)的一类化合物，受热后—O—O—键断裂，分裂成两个相应的自由基，从而引发单体聚合。过氧化物类引发剂分为无机过氧化物和有机过氧化物两类，无机过氧化物引发剂包括过氧化氢、过硫酸铵或过硫酸钾等；有机过氧化物引发剂包括过氧化苯甲酰、过氧化苯甲酰叔丁酯、过氧化甲乙酮等，可引发不饱和聚酯的聚合、橡胶的硫化、氯乙烯、苯乙烯等烯类单体的聚合。
进一步的，所述第二层基材厚度为2～12um，基材类型包括PP(聚丙烯)、 PA(聚酰胺)或PET(聚对苯二甲酸乙二醇酯)，具体基材类型不限，但厚度不超过12um。
进一步的，所述第三层底涂胶为SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，与第一层所使用的SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶一致，涂布厚度为2～4um。
进一步的，所述第四层胶黏层用苯乙烯分子链段含量为30～40％的SEBS(氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物)，涂布厚度2～4um。SEBS是以聚苯乙烯为末端段，以聚丁二烯加氢得到的乙烯-丁烯共聚物为中间弹性嵌段的线性三嵌共聚物。SEBS不含不饱和双键，因此具有良好的稳定性和耐老化性。
进一步的，所述第五层胶黏层为双面离型膜，该膜可以为PET、BOPP、或双面无硅离型膜，厚度不做要求。
应该理解的是，上述胶粘带第一层和第三层所用的胶黏剂并不局限于特制的丙烯酸酯胶黏剂和特制的SIS胶黏剂，也可以使用其他类型的压敏胶，但要满足在锂电池中使用，不得跟锂电池用电解液发生物理溶解和化学反应，导致锂电池性能发生变化。
同样的，上述胶粘带第四层所用保护层胶黏剂也并不局限于使用SEBS，只要满足涂布在第三层胶黏层后，能与第三层胶黏层粘结紧密，并且在常温下第四层胶黏层无粘性，经过高温或高压便可以粘结锂电池外壳的内表面即可。
本发明申请所述的胶粘带，第一层压敏胶在常温下稍加压力便对电池极组产生强力的粘结性，该层压敏胶使用橡胶改性丙烯酸酯胶水，对粘结材料具有很好的密封性，不会被锂电池电解液浸润和破坏；同样使用特制的SIS压敏胶也具有同样的效果。所述发明申请胶粘带，第四层在60℃以下是不具有粘性的，需要在60℃以上，并施加0.5MPa以上的压力后就会对锂电池外壳产生很 强的粘结性，并且该材料化学性能稳定，耐锂电池电解液性能强，不会跟锂电池电解液反应。
本发明申请所述的提高电池抗跌落性能的胶粘带的制作方法如下所述：
1.将常温无粘性胶粘剂SEBS加入转移式涂布机，启动涂布机，将双面无硅离型膜送入涂布机放卷处，在双面无硅离型膜的一侧面涂布上常温无粘性胶黏剂SEBS，形成常温无粘性胶层，并收成卷；
2.将基膜安装到基膜放卷辊，将特制SIS压敏胶加入转移式刮刀涂布机，同时将特制丙烯酸酯压敏胶或特制SIS压敏胶加入挤出式涂布机，将带有常温无粘性密封胶层的双面无硅离型膜安装到离型膜放卷辊；其中，挤出式涂布机设有精确计量型计量泵，该计量泵主要是保证输出胶的质量精准，使得涂布的精度提高，目前挤出式涂布机涂布厚度精度可以控制在0.5um左右；
3.启动所有设备，将基膜送到转移式刮刀涂布机，转移式刮刀涂布机利用转移式刮刀涂布头在基膜的一侧面涂布上特制SIS压敏胶，接着将基膜送入烘干装置，除去特制SIS压敏胶中的溶剂，形成第三胶层；
4.将带有第三层特制SIS压敏胶层的基膜和带有常温无粘性密封胶层的双面无硅离型膜送入离型膜贴合装置，使第三层特制SIS压敏胶层与第四层常温无粘性SEBS胶层贴合；
5.将基膜送入挤出式涂布机，挤出式涂布机利用挤出式涂布头在基膜的另一侧面涂布上特制丙烯酸酯压敏胶或特制SIS压敏胶，形成第一层压敏胶层；
6.将基膜送到收卷装置进行收卷，即得成品。
本发明申请所述的提高电池抗跌落性能的胶粘带，具备以下有益效果：
(1)根据本发明该胶带整体厚度减薄至16～35um，可减少在电池内部的 占用空间，增大电池能量密度；
(2)本发明中该胶带对电池极组和外壳粘结力强，可减少在电池内部的使用面积，从而增大电池能量密度；
(3)该胶带可防止电池极组和电池外壳之间的相对运动；
(4)该胶带由于将电池极组和电池外壳进行固定，可防止电池因振动或跌落造成电池极组脱离电池外壳的保护受到严重撞击后产生电池短路或断路。
(5)该胶带两面都使用具有黏流特性的压敏胶，在电池受到一定撞击的情况下具有吸收振动能量的作用，从而起到保护电池极组不受破坏。
具体实施方式
以下结合具体实施方式对本发明申请所述的技术方案进行说明，目的是为了公众更好地理解所述技术方案，而不是对其进行任意限制。
实施例一
一种能够提高电池抗跌落性能的胶粘带，共五层结构，从最贴近电池极组往上，依次为压敏胶、基材、底涂胶、胶黏层和双面离型膜，其中，第一层压敏胶由丙烯酸酯胶黏剂构成，涂布厚度为2um，所述的丙烯酸酯胶黏剂，包括如下质量比的各种组分：1、聚烯烃橡胶I：20份，2、聚烯烃橡胶II：5份，3、丙烯酸树脂：60份；4、氮丙啶固化剂：1份；所述第二层基材为PP，厚度为2um；第三层底涂胶为SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，涂布厚度为2um；包括以下质量份的各种组分：1、SIS橡胶弹性体I 15份，2、SIS橡胶弹性体II 20份，3、聚烯烃橡胶I 20份，4、聚烯烃橡胶II 5份，5、液体石油树脂10份，6、氢化石油树脂20份，7、过氧化苯甲酰0.5份；所述第四层胶黏层用苯乙烯分子链段含量为30～40％的SEBS(氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物)，涂布厚度2um；所述第五层胶黏层为PET双 面离型膜，厚度36um。
其中，聚烯烃橡胶I，具有羧基官能团，分子量0.5～1万；聚烯烃橡胶II，具有马来酸酐官能团，分子量0.5～1万；SIS橡胶弹性体I的分子量5～10万，SIS橡胶弹性体II分子量10～20万，液体石油树脂分子量0.1～0.3万，氢化石油树脂分子量0.2～0.5万，均市售可得。
上述的胶粘带，制作方法如下：
1.将常温无粘性胶粘剂SEBS加入转移式涂布机，启动涂布机，将双面PET双面离型膜送入涂布机放卷处，在离型膜的一侧面涂布上常温无粘性胶黏剂SEBS，形成常温无粘性胶层，并收成卷；
2.将基膜安装到基膜放卷辊，将特制SIS压敏胶加入转移式刮刀涂布机，同时将特制丙烯酸酯压敏胶加入挤出式涂布机，将带有常温无粘性密封胶层的离型膜安装到离型膜放卷辊；
3.启动所有设备，将基膜送到转移式刮刀涂布机，转移式刮刀涂布机利用转移式刮刀涂布头在基膜的一侧面涂布上特制SIS压敏胶，接着将基膜送入烘干装置，除去特制SIS压敏胶中的溶剂，形成第三胶层；
4.将带有第三层特制SIS压敏胶层的基膜和带有常温无粘性密封胶层的离型膜送入离型膜贴合装置，使第三层特制SIS压敏胶层与第四层常温无粘性SEBS胶层贴合；
5.将基膜送入挤出式涂布机，挤出式涂布机利用挤出式涂布头在基膜的另一侧面涂布上特制丙烯酸酯压敏胶或特制SIS压敏胶，形成第一层压敏胶层；
6.将基膜送到收卷装置进行收卷，即得成品。
实施例二
一种能够提高电池抗跌落性能的胶粘带，共五层结构，从最贴近电池极组往上，依次为压敏胶、基材、底涂胶、胶黏层和双面离型膜，其中，第一层压敏胶由丙烯酸酯胶黏剂构成，涂布厚度为4um，所述的丙烯酸酯胶黏剂，包括如下质量比的各种组分：1、聚烯烃橡胶I：30份，2、聚烯烃橡胶II：10份，3、丙烯酸树脂：70份；4、聚氨酯固化剂：2份；所述第二层基材为PA(聚酰胺)基材，厚度为12um；第三层底涂胶为SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，涂布厚度为4um；包括以下质量份的各种组分：1、SIS橡胶弹性体I 25份，2、SIS橡胶弹性体II 40份，3、聚烯烃橡胶I 30份，4、聚烯烃橡胶II 10份，5、液体石油树脂20份，6、氢化石油树脂30份，7、过氧化苯甲酰叔丁酯1份；所述第四层胶黏层用苯乙烯分子链段含量为30～40％的SEBS(氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物)，涂布厚度4um；所述第五层胶黏层为PET 36um双面离型膜。
其中，聚烯烃橡胶I，具有羧基官能团，分子量0.5～1万；聚烯烃橡胶II，具有马来酸酐官能团，分子量0.5～1万；SIS橡胶弹性体I的分子量5～10万，SIS橡胶弹性体II分子量10～20万，液体石油树脂分子量0.1～0.3万，氢化石油树脂分子量0.2～0.5万，均市售可得。
上述的胶粘带，制作方法如下：
1.将常温无粘性胶粘剂SEBS加入转移式涂布机，启动涂布机，将双面无硅离型膜送入涂布机放卷处，在离型膜的一侧面涂布上常温无粘性胶黏剂SEBS，形成常温无粘性胶层，并收成卷；
2.将基膜安装到基膜放卷辊，将特制SIS压敏胶加入转移式刮刀涂布机，同时将特制丙烯酸酯压敏胶加入挤出式涂布机，将带有常温无粘性密封胶层 的离型膜安装到离型膜放卷辊；
3.启动所有设备，将基膜送到转移式刮刀涂布机，转移式刮刀涂布机利用转移式刮刀涂布头在基膜的一侧面涂布上特制SIS压敏胶，接着将基膜送入烘干装置，除去特制SIS压敏胶中的溶剂，形成第三胶层；
4.将带有第三层特制SIS压敏胶层的基膜和带有常温无粘性密封胶层的离型膜送入离型膜贴合装置，使第三层特制SIS压敏胶层与第四层常温无粘性SEBS胶层贴合；
5.将基膜送入挤出式涂布机，挤出式涂布机利用挤出式涂布头在基膜的另一侧面涂布上特制丙烯酸酯压敏胶或特制SIS压敏胶，形成第一层压敏胶层；
6.将基膜送到收卷装置进行收卷，即得成品。
实施例三
一种能够提高电池抗跌落性能的胶粘带，共五层结构，从最贴近电池极组往上，依次为压敏胶、基材、底涂胶、胶黏层和双面离型膜，其中，第一层压敏胶由丙烯酸酯胶黏剂构成，涂布厚度为3um，所述的丙烯酸酯胶黏剂，包括如下质量比的各种组分：1、聚烯烃橡胶I：26份，2、聚烯烃橡胶II：7份，3、丙烯酸树脂：65份；4、环氧固化剂：1.5份；所述第二层基材为PET(聚对苯二甲酸乙二醇酯)基材，厚度为8um；第三层底涂胶为SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，涂布厚度为3um；包括以下质量份的各种组分：1、SIS橡胶弹性体I 20份，2、SIS橡胶弹性体II 30份，3、聚烯烃橡胶I 26份，4、聚烯烃橡胶II 7份，5、液体石油树脂15份，6、氢化石油树脂24份，7、过氧化苯甲酰叔丁酯0.8份；所述第四层胶黏层用苯乙烯分子链段含量为30～40％的SEBS(氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物)，涂布厚度3um；所述第五层胶黏层为PET 36um双面离型膜。
其中，聚烯烃橡胶I，具有羧基官能团，分子量0.5～1万；聚烯烃橡胶II，具有马来酸酐官能团，分子量0.5～1万；SIS橡胶弹性体I的分子量5～10万，SIS橡胶弹性体II分子量10～20万，液体石油树脂分子量0.1～0.3万，氢化石油树脂分子量0.2～0.5万，均市售可得。BOPP离型膜就是在BOPP薄膜表面涂了一层硅油，之后可以很容易跟压敏胶分离的一种搜索薄膜。BOPP是“Biaxially Oriented Polypropylene”的简称，即双向拉伸聚丙烯薄膜，它的生产是将高分子聚丙烯的熔体首先通过狭长机头制成片材或厚膜，然后在专用的拉伸机内，在一定的温度和设定的速度下，同时或分步在垂直的两个方向(纵向、横向)上进行的拉伸，并经过适当的冷却或热处理或特殊的加工(如电晕、涂覆等)制成的薄膜。
上述的胶粘带，制作方法如下：
1.将常温无粘性胶粘剂SEBS加入转移式涂布机，启动涂布机，将双面BOPP离型膜送入涂布机放卷处，在离型膜的一侧面涂布上常温无粘性胶黏剂SEBS，形成常温无粘性胶层，并收成卷；
2.将基膜安装到基膜放卷辊，将特制SIS压敏胶加入转移式刮刀涂布机，同时将特制丙烯酸酯压敏胶加入挤出式涂布机，将带有常温无粘性密封胶层的离型膜安装到离型膜放卷辊；
3.启动所有设备，将基膜送到转移式刮刀涂布机，转移式刮刀涂布机利用转移式刮刀涂布头在基膜的一侧面涂布上特制SIS压敏胶，接着将基膜送入烘干装置，除去特制SIS压敏胶中的溶剂，形成第三胶层；
4.将带有第三层特制SIS压敏胶层的基膜和带有常温无粘性密封胶层的离型膜送入离型膜贴合装置，使第三层特制SIS压敏胶层与第四层常温无粘性SEBS胶层贴合；
5.将基膜送入挤出式涂布机，挤出式涂布机利用挤出式涂布头在基膜的另一侧面涂布上特制丙烯酸酯压敏胶或特制SIS压敏胶，形成第一层压敏胶层；
6.将基膜送到收卷装置进行收卷，即得成品。
实施例四
一种能够提高电池抗跌落性能的胶粘带，共五层结构，从最贴近电池极组往上，依次为压敏胶、基材、底涂胶、胶黏层和双面离型膜，其中，第一层的压敏胶也为SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，涂布厚度为7um，包括以下质量份的各种组分：1、SIS橡胶弹性体I 20份，2、SIS橡胶弹性体II 25份，3、聚烯烃橡胶I 26份，4、聚烯烃橡胶II 7份，5、液体石油树脂15份，6、氢化石油树脂22份，7、过氧化甲乙酮0.6份；所述第二层基材为PP(聚丙烯)基材，厚度为6um；第三层底涂胶为SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，涂布厚度为4um；包括以下质量份的各种组分：1、SIS橡胶弹性体I 20份，2、SIS橡胶弹性体II 30份，3、聚烯烃橡胶I 26份，4、聚烯烃橡胶II 7份，5、液体石油树脂15份，6、氢化石油树脂24份，7、过氧化苯甲酰叔丁酯0.8份；所述第四层胶黏层用苯乙烯分子链段含量为30～40％的SEBS(氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物)，涂布厚度4um；所述第五层胶黏层为36um PET双面离型膜。
其中，聚烯烃橡胶I，具有羧基官能团，分子量0.5～1万；聚烯烃橡胶II，具有马来酸酐官能团，分子量0.5～1万；SIS橡胶弹性体I的分子量5～10万，SIS橡胶弹性体II分子量10～20万，液体石油树脂分子量0.1～0.3万，氢化石油树脂分子量0.2～0.5万，均市售可得。
上述的胶粘带，制作方法如下：
1.将常温无粘性胶粘剂SEBS加入转移式涂布机，启动涂布机，将双面PET 离型膜送入涂布机放卷处，在离型膜的一侧面涂布上常温无粘性胶黏剂SEBS，形成常温无粘性胶层，并收成卷；
2.将基膜安装到基膜放卷辊，将SIS压敏胶加入转移式刮刀涂布机，同时将SIS压敏胶加入挤出式涂布机，将带有常温无粘性密封胶层的离型膜安装到离型膜放卷辊；
3.启动所有设备，将基膜送到转移式刮刀涂布机，转移式刮刀涂布机利用转移式刮刀涂布头在基膜的一侧面涂布上SIS压敏胶，接着将基膜送入烘干装置，除去SIS压敏胶中的溶剂，形成第三胶层；
4.将带有第三层SIS压敏胶层的基膜和带有常温无粘性密封胶层的离型膜送入离型膜贴合装置，使第三层特制SIS压敏胶层与第四层常温无粘性SEBS胶层贴合；
5.将基膜送入挤出式涂布机，挤出式涂布机利用挤出式涂布头在基膜的另一侧面涂布上SIS压敏胶，形成第一层压敏胶层；
6.将基膜送到收卷装置进行收卷，即得成品。
本发明申请所述的提高电池抗跌落性能的胶粘带，总厚度为16～35um，并且所使用的材料不会跟电解液发生反应，主要靠加热或加压的方式对电池极组和外壳内表面产生粘结性，并且粘结强度高，在电池中使用很小的面积就能达到满意的效果。
应该理解的是，上述内容不是对所述技术方案的限制，事实上，在相同或近似的原理下，对所述技术方案进行的改进，等同变化与修饰，均仍属于本发明申请所要求保护的技术方案。

Claims (10)

  1. 一种能够提高电池抗跌落性能的胶粘带，其特征在于：所述胶粘带包括五层结构，第一层为常温具有粘结性的压敏胶，用于粘结电池极组的外表面；第二层为基材；第三层为底涂胶，用于粘结基材和第四层；第四层为胶黏层，用于粘结电池外壳的内表面；第五层为双面离型膜。
  2. 根据权利要求1所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述第一层的压敏胶由丙烯酸酯胶黏剂构成，涂布厚度为2～4um。
  3. 根据权利要求2所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述的丙烯酸酯胶黏剂，包括如下质量比的各种组分：
    Figure PCTCN2016082168-appb-100001
  4. 根据权利要求1所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述第一层的压敏胶为SIS压敏胶，涂布厚度为5～10um。
  5. 根据权利要求4所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述的SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)压敏胶，包括以下质量份的各种组分：
    Figure PCTCN2016082168-appb-100002
    Figure PCTCN2016082168-appb-100003
  6. 根据权利要求1-5任一项所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述第二层基材厚度为2～12um，基材类型包括PP、PA或PET。
  7. 根据权利要求1-5任一项所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述第三层底涂胶为SIS压敏胶，涂布厚度为2～4um。
  8. 根据权利要求1-5任一项所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述第四层胶黏层用苯乙烯分子链段含量为30～40％的SEBS，涂布厚度2～4um。
  9. 根据权利要求1-5任一项所述的能够提高电池抗跌落性能的胶粘带，其特征在于：所述第五层胶黏层为双面离型膜。
  10. 权利要求1所述的能够提高电池抗跌落性能的胶粘带的制作方法，其特征在于，包括如下的步骤：
    1)将常温无粘性胶粘剂SEBS加入转移式涂布机，启动涂布机，将双面无硅离型膜送入涂布机放卷处，在双面无硅离型膜的一侧面涂布上常温无粘性胶黏剂SEBS，形成常温无粘性胶层，并收成卷；
    2)将基膜安装到基膜放卷辊，将特制SIS压敏胶加入转移式刮刀涂布机，同时将特制丙烯酸酯压敏胶或特制SIS压敏胶加入挤出式涂布机，将带有常温无粘性密封胶层的双面无硅离型膜安装到离型膜放卷辊；其中，挤出式涂布机设有精确计量型计量泵，该计量泵主要是保证输出胶的质量精准，使得涂布的精度提高，目前挤出式涂布机涂布厚度精度可以控制在0.5um左右；
    3)启动所有设备，将基膜送到转移式刮刀涂布机，转移式刮刀涂布机利用转移式刮刀涂布头在基膜的一侧面涂布上特制SIS压敏胶，接着将基膜送入烘干装置，除去特制SIS压敏胶中的溶剂，形成第三胶层；
    4)将带有第三层特制SIS压敏胶层的基膜和带有常温无粘性密封胶层的双面无硅离型膜送入离型膜贴合装置，使第三层特制SIS压敏胶层与第四层常温无粘性SEBS胶层贴合；
    5)将基膜送入挤出式涂布机，挤出式涂布机利用挤出式涂布头在基膜的另一侧面涂布上特制丙烯酸酯压敏胶或特制SIS压敏胶，形成第一层压敏胶层；
    6)将基膜送到收卷装置进行收卷，即得成品。
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CN113969115B (zh) * 2021-12-07 2023-04-18 苏州世华新材料科技股份有限公司 一种快速流平超薄网格胶带及其制备方法
CN115029078A (zh) * 2022-08-10 2022-09-09 楚能新能源股份有限公司 新型抗跌落软包卷绕电芯以及贴胶与贴胶方法
CN115029078B (zh) * 2022-08-10 2022-11-15 楚能新能源股份有限公司 抗跌落软包卷绕电芯以及贴胶与贴胶方法

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