阅读说明：本技术 一种软包电池极耳用极耳胶带及其制备方法 (Tab adhesive tape for soft package battery tab and preparation method thereof ) 是由 单化众 吕松 王芳 于 2020-07-16 设计创作，主要内容包括：本发明提供一种软包电池极耳用极耳胶带及其制备方法,所制得的极耳胶带由外而内依次为无机纳米粒子溶胶层、抗析出耐摩擦改性cpp层、耐高温高强度改性pp层和茂金属改性cpp层。该方法有效地增强了极耳胶带的机械性能；增加了极耳胶带的耐磨性,减少刮擦带来的擦痕,减少极耳胶带后期复合擦痕中隐藏的污渍,延长使用寿命,增加电池的安全性。(The invention provides a tab adhesive tape for a soft package battery tab and a preparation method thereof. The method effectively enhances the mechanical property of the tab adhesive tape; the wear resistance of the tab adhesive tape is improved, scratches caused by scraping are reduced, stains hidden in later-stage composite scratches of the tab adhesive tape are reduced, the service life is prolonged, and the safety of the battery is improved.)

1. The utility model provides a laminate polymer battery is utmost point ear sticky tape for utmost point ear which characterized in that: the inorganic nano particle sol layer, the precipitation-resistant friction-resistant modified cpp layer, the high-temperature-resistant high-strength modified pp layer and the metallocene modified cpp layer are sequentially arranged from outside to inside.

2. The tab tape for the soft package battery tab according to claim 1, wherein: the thickness of the inorganic nano particle sol layer is 0.5-3 mu m.

3. The tab tape for the soft package battery tab according to claim 1, wherein: the inorganic nanoparticle sol layer is a silica-alumina mixed gel formed by stirring aluminum sec-butoxide, tetraethoxysilane, a silane coupling agent, p-toluenesulfonic acid and ethanol, wherein the aluminum sec-butoxide, tetraethoxysilane, the silane coupling agent and the p-toluenesulfonic acid are main materials, the ethanol is a diluent, and the tetraethoxysilane: the mass ratio of the secondary aluminum butoxide is 20: 80-80: 20, the mass of the silane coupling agent accounts for 10-30% of the main material, the mass of the p-toluenesulfonic acid accounts for 1-5% of the main material, and the mass of the ethanol accounts for 15-30 times of the addition amount of the main material.

4. The tab tape for the soft package battery tab according to claim 1, wherein: the thickness of the anti-precipitation friction-resistant modified cpp layer is 10-50 mu m.

5. The tab tape for the soft package battery tab according to claim 1, wherein: the anti-precipitation friction-resistant modified cpp layer consists of acid-modified pp, a lubricant and other additives, wherein the lubricant is any one or more of ethylene bis stearamide, oleamide, erucamide and organic silicon; the other additives comprise an antioxidant and an anti-blocking agent, and the mass ratio of the antioxidant to the anti-blocking agent is as follows: 1:1, the acid-modified pp: lubricant: the mass ratio of other additives is 70-90: 5-20: 5 to 10.

6. The tab tape for the soft package battery tab according to claim 1, wherein: the thickness of the high-temperature-resistant high-strength modified pp layer is 10-100 mu m.

7. The tab tape for the soft package battery tab according to claim 1, wherein: the high-temperature-resistant high-strength modified pp layer consists of low-melting-point pp particles and a reinforcing agent, wherein the reinforcing agent is any one of barium sulfate, talcum powder, fiber-like needle-like wollastonite, organic fibers and inorganic fibers, and the low-melting-point pp particles are as follows: the mass ratio of the reinforcing agent is 80-95: 5 to 20.

8. The tab tape for the soft package battery tab according to claim 1, wherein: the thickness of the metallocene modified cpp layer is 10-50 mu m.

9. The method for preparing the tab tape for the soft package battery tab according to any one of claims 1 to 8, comprising the steps of:

(1) preparing inorganic nanoparticle sol: mixing the aluminum sec-butoxide, the ethyl orthosilicate, the silane coupling agent, the p-toluenesulfonic acid and the ethanol, and stirring for 60-150 min at the temperature of normal temperature-40 ℃ and the speed of 800-1000 r/min to obtain inorganic nanoparticle sol;

(2) preparation of anti-precipitation friction-resistant modified cpp: mixing the acid modified pp, the lubricant and other additives, stirring for 30-60 min at the temperature of normal temperature-80 ℃ and the speed of 300-600 r/min to obtain precipitation-resistant friction-resistant modified cpp, and adding the precipitation-resistant friction-resistant modified cpp into a charging barrel A of an extruder for later use;

(3) preparing high-temperature-resistant high-strength modified PP: mixing the low-melting-point high-melting-point pp particles with a reinforcing agent, stirring for 30-60 min at normal temperature and at the speed of 300-600 r/min to obtain high-temperature-resistant high-strength modified pp, and adding the high-temperature-resistant high-strength modified pp into a material cylinder B of an extruder for later use;

(4) adding the metallocene modified cpp into a charging barrel C of an extruder for standby;

(5) co-extrusion step: setting the processing temperature of the precipitation-resistant friction-resistant modified cpp and the metallocene modified cpp to be 180/210/220/230/230/240/240/240 ℃ in sequence, setting the processing temperature of the high-temperature-resistant high-strength modified pp to be 180/210/230/240/240/250/250/250 ℃ in sequence, setting the temperature of a film head of the extruder to be 240-250 ℃, casting a resin melt consisting of the three materials from a die head of the extruder, and forming a three-layer structure of a precipitation-resistant friction-resistant modified cpp layer/the high-temperature-resistant high-strength modified pp layer/the metallocene modified cpp layer through a quenching cooling roller with the temperature of 15-30 ℃, namely a primary tab adhesive tape;

(6) preparing an inorganic nanoparticle sol layer: coating a layer of inorganic nanoparticle sol on the surface of the anti-precipitation friction-resistant modified cpp layer of the primary tab adhesive tape at the speed of 30-80 m/min, wherein the coating thickness is 0.5-3 mu m, and then drying for 30-150 seconds at the temperature of 70-110 ℃ to obtain the final tab adhesive tape.

Technical Field

The invention belongs to the technical field of lithium battery industry, and particularly relates to a tab adhesive tape for a soft package battery tab and a preparation method thereof.

Background

The soft package lithium battery tab is generally composed of a metal belt and tab adhesive tapes symmetrically attached to two surfaces of the metal belt, wherein the tab adhesive tapes mainly play an insulating role and prevent the metal belt from being in direct contact with an aluminum plastic film to form a short circuit. The tab adhesive tape can cause friction in the transportation and use processes, scratches are formed on the surface, dust, dirt and the like are easily hidden in the scratches under certain environments, and in the later use process of the tab, particularly in the heat sealing process, the tab adhesive tape and a metal sheet are easily layered or the metal sheet and the aluminum metal in a battery packaging film are easily short-circuited, so that the battery is safe to use. The existing tab adhesive tape has good chemical corrosion resistance, but is easy to rub with machines or other materials in the using process, so that the whitening phenomenon or scratch occurs, and the later appearance use and the bonding performance with metal are influenced. The existing tab adhesive tape is generally made of a PP (polypropylene) material modified by a thermoplastic elastomer, and although the toughness of the tab adhesive tape is increased, the tensile strength of the tab adhesive tape is reduced. Therefore, a novel tab adhesive tape for a tab of a soft package battery needs to be produced to solve the problems.

Disclosure of Invention

The invention aims to solve the technical problem of providing a tab adhesive tape for a soft-package battery tab and a preparation method thereof, and solves the problem.

In order to solve the technical problem, the invention provides a tab adhesive tape for a soft package battery tab, which sequentially comprises an inorganic nanoparticle sol layer, an anti-precipitation friction-resistant modified cpp layer, a high-temperature-resistant high-strength modified pp layer and a metallocene modified cpp layer from outside to inside.

As a preferable scheme of the tab adhesive tape for the soft package battery tab, the thickness of the inorganic nano particle sol layer is 0.5-3 mu m.

As a preferable scheme of the tab adhesive tape for the soft-package battery tab, the inorganic nanoparticle sol layer is a silica-alumina mixed gel formed by stirring aluminum sec-butoxide, ethyl orthosilicate, a silane coupling agent, p-toluenesulfonic acid and ethanol, wherein the aluminum sec-butoxide, the ethyl orthosilicate, the silane coupling agent and the p-toluenesulfonic acid are main materials, the ethanol is a diluent, and the ratio of ethyl orthosilicate: the mass ratio of the secondary aluminum butoxide is 20: 80-80: 20, the mass of the silane coupling agent accounts for 10-30% of the main material, the mass of the p-toluenesulfonic acid accounts for 1-5% of the main material, and the mass of the ethanol accounts for 15-30 times of the addition amount of the main material.

According to a preferable scheme of the tab adhesive tape for the soft-package battery tab, the thickness of the anti-precipitation friction-resistant modified cpp layer is 10-50 mu m.

As a preferable scheme of the tab tape for the soft package battery tab, the anti-separation friction-resistant modified cpp layer consists of acid-modified pp, a lubricant and other additives, wherein the lubricant is any one or more of ethylene bis-stearamide, oleamide, erucamide and organic silicon; the other additives comprise an antioxidant and an anti-blocking agent, and the mass ratio of the antioxidant to the anti-blocking agent is as follows: 1:1, the acid-modified pp: lubricant: the mass ratio of other additives is 70-90: 5-20: 5 to 10.

As a preferable scheme of the tab adhesive tape for the soft-package battery tab, the thickness of the high-temperature-resistant high-strength modified pp layer is 10-100 mu m.

As a preferable scheme of the tab adhesive tape for the soft package battery tab, the high temperature resistant and high strength modified pp layer comprises low melting point pp particles and a reinforcing agent, wherein the reinforcing agent is any one of barium sulfate, talcum powder, fiber-like needle-like wollastonite, organic fibers and inorganic fibers, and the low melting point pp particles are: the mass ratio of the reinforcing agent is 80-95: 5 to 20.

According to a preferable scheme of the tab adhesive tape for the soft-package battery tab, the thickness of the metallocene modified cpp layer is 10-50 mu m.

The invention also provides a preparation method of the tab adhesive tape for the soft package battery tab, which comprises the following steps:

(1) preparing inorganic nanoparticle sol: mixing the aluminum sec-butoxide, the ethyl orthosilicate, the silane coupling agent, the p-toluenesulfonic acid and the ethanol, and stirring for 60-150 min at the temperature of normal temperature-40 ℃ and the speed of 800-1000 r/min to obtain inorganic nanoparticle sol;

(2) preparation of anti-precipitation friction-resistant modified cpp: mixing the acid modified pp, the lubricant and other additives, stirring for 30-60 min at the temperature of normal temperature-80 ℃ and the speed of 300-600 r/min to obtain precipitation-resistant friction-resistant modified cpp, and adding the precipitation-resistant friction-resistant modified cpp into a charging barrel A of an extruder for later use;

(3) preparing high-temperature-resistant high-strength modified pp: mixing the low-melting-point high-melting-point pp particles with a reinforcing agent, stirring for 30-60 min at normal temperature and at the speed of 300-600 r/min to obtain high-temperature-resistant high-strength modified pp, and adding the high-temperature-resistant high-strength modified pp into a material cylinder B of an extruder for later use;

(4) adding the metallocene modified cpp into a charging barrel C of an extruder for standby;

(5) co-extrusion step: setting the processing temperature of the precipitation-resistant friction-resistant modified cpp and the metallocene modified cpp to be 180/210/220/230/230/240/240/240 ℃ in sequence, setting the processing temperature of the high-temperature-resistant high-strength modified pp to be 180/210/230/240/240/250/250/250 ℃ in sequence, setting the temperature of a film head of the extruder to be 240-250 ℃, casting a resin melt consisting of the three materials from a die head of the extruder, and forming a three-layer structure of a precipitation-resistant friction-resistant modified cpp layer/the high-temperature-resistant high-strength modified pp layer/the metallocene modified cpp layer through a quenching cooling roller with the temperature of 15-30 ℃, namely a primary tab adhesive tape;

(6) preparing an inorganic nanoparticle sol layer: coating a layer of inorganic nanoparticle sol on the surface of the anti-precipitation friction-resistant modified cpp layer of the primary tab adhesive tape at the speed of 30-80 m/min, wherein the coating thickness is 0.5-3 mu m, and then drying for 30-150 seconds at the temperature of 70-110 ℃ to obtain the final tab adhesive tape.

Compared with the prior art, the tab adhesive tape for the soft-package battery tab and the preparation method thereof provided by the invention have the following advantages:

1. the mechanical property of the tab adhesive tape is enhanced;

2. the wear resistance of the tab adhesive tape is improved, scratches caused by scraping are reduced, stains hidden in later-stage composite scratches of the tab adhesive tape are reduced, the service life is prolonged, and the safety of the battery is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein the content of the first and second substances,

fig. 1 is a schematic structural view of a tab adhesive tape for a soft-package battery tab according to the present invention;

FIG. 2 is an enlarged surface view of a tab tape for a tab of a pouch battery in a comparative example;

fig. 3 is an enlarged surface view of a tab tape for a tab of a soft package battery according to the present invention.

Wherein: 1 is an inorganic nano particle sol layer, 2 is an anti-precipitation friction-resistant modified cpp layer, 3 is a high-temperature-resistant high-strength modified pp layer, and 4 is a metallocene modified cpp layer.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.

First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Next, the present invention is described in detail by using schematic structural diagrams, etc., and for convenience of description, the schematic diagrams illustrating the structure of the tab tape for a tab of a flexible package battery are not partially enlarged according to a general scale, and are only examples, which should not limit the scope of protection of the present invention. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.

Referring to fig. 1, fig. 1 is a schematic structural view of a tab tape for a tab of a flexible package battery according to the present invention. As shown in fig. 1, the tab tape for the soft-package battery tab of the invention sequentially comprises (1) an inorganic nanoparticle sol layer 1 from outside to inside; (2) the anti-precipitation friction-resistant modified cpp layer 2; (3) a high temperature resistant high strength modified pp layer 3; (4) metallocene modified cpp layer 4. The structure, material, process, etc. of each layer are described in detail below.

(1) The inorganic nano particle sol layer 1 is 0.5-3 mu m thick, is formed by stirring aluminum sec-butoxide, ethyl orthosilicate, a silane coupling agent, p-toluenesulfonic acid and ethanol, and mainly comprises the following preparation steps: (aluminum sec-butoxide + ethyl orthosilicate) + silane coupling agent + p-toluenesulfonic acid + ethanol → silica-alumina mixed gel. Ethyl orthosilicate: the mass ratio of the sec-butyl alcohol is within the range of (20:80) - (80:20), the mass ratio of the silane coupling agent is 10-30%, the mass ratio of the p-toluenesulfonic acid is 1-5%, ethanol is used as a diluent, industrial-grade ethanol with the concentration of 99% can be selected, and the mass of the industrial-grade ethanol is 15-30 times of the mass of the main addition amount. The solution is prepared and is stirred hermetically for 60-150 min under magnetic stirring (stirring speed: 800-1000 r/min), and the temperature of the solution is kept between normal temperature and 40 ℃ to obtain the inorganic nano particle sol. The method is characterized in that aluminum sec-butoxide and ethyl orthosilicate are used as precursors, p-toluenesulfonic acid is used as a catalyst, moisture in the air is used as a hydrolysis source, a relatively stable Si-O-Al covalent bond is formed, and the prepared inorganic nanoparticle sol has good transparency and wear resistance. The in-situ prepared particles can be uniform in size by stirring at a high speed for a long time in the reaction process, the phenomenon of whitening caused by crosslinking and agglomeration of sol is reduced, and the light transmittance is high.

(2) The anti-precipitation friction-resistant modified cpp layer 2 is 10-50 microns thick and comprises the following raw materials: acid-modified pp, including any one of samsundadale RF402, japan sumitomo Y101, samsung HJ400, petrochemical C1608, and the like; ② lubricants, such as any one or more of ethylene bis stearamide, oleamide, erucamide, silicones; ③ other additives comprise antioxidant and antiblocking agent. The mass ratio of the antioxidant to the anti-blocking agent is as follows: 1:1, the antioxidant can be one of Pasteur 1076, 1035, American jaba PW-9225B, Taiwan Changchun 2112, calla Y596 and the like; the anti-blocking agent may be one of SN-Q25, Japan Water JC30, Gasil AB720, Korea Peceway O-M, and the like. Acid-modified pp: lubricant: and other additives are (70-90): (5-20): (5-10) stirring at the temperature of normal temperature-80 ℃ (stirring speed is 300-600 r/min) for 30-60 min, and adding the precipitation-resistant friction-resistant modified cpp formed after stirring into a charging barrel A of an extruder for later use. The traditional material only has acid modified pp and does not have the precipitation resistance and the friction resistance. By adding the lubricant and the anti-blocking agent, the surface of the pp material can form concave-convex shapes, the adsorption effect between the film and the film or other materials is reduced, and the friction coefficient is reduced.

(3) The high-temperature-resistant high-strength modified pp layer 3 is 10-100 microns thick and comprises the following raw materials: the low melting point pp particles include Yanshan petrochemical F1002, T1701, Sanxingxing CF330 in Korea, Singapore TPC FS5611, SunAllomer PC480A in Japan, and Nordic chemical HD601 CF. ② reinforcing agent, such as any one of barium sulfate, talcum powder, wollastonite with similar fiber needle structure, organic fiber, inorganic fiber, etc. Low melting point refers to high melting point pp: the reinforcing agent is (80-95): (5-20), stirring at normal temperature (stirring speed of 300-600 r/min) for 30-60 min, and adding the high-temperature-resistant high-strength modified pp formed after stirring into a charging barrel B of the extruder for later use. The traditional pp material is generally low in strength and poor in crystallinity, and after a reinforcing agent (particularly wollastonite with a fiber-like needle structure) is added, heterogeneous nucleation can be increased in the pp melt extrusion process, the crystallinity of the pp film is improved, and the thermal stability of the pp film is improved.

(4) The metallocene modified pp layer 4 is 10-50 μm thick, and the raw material comprises any one of Exxon Mobil BL2281 model, 4518pa model, Nippon Mitsui chemical PN0040 model, Dadall MR2002, MR2007 model and the like. The metallocene modified pp was added to the extruder barrel C for use.

(5) After the respective preparation of the materials is finished, the co-extrusion step is carried out: the processing temperature of the anti-separation friction-resistant modified cpp layer 2 and the metallocene modified pp layer 4 is as follows: setting the temperature of 8 sections of the extruder to be 180/210/220/230/230/240/240/240 ℃ in sequence; the processing temperature of the high-temperature-resistant high-strength modified pp layer 3 is as follows: the temperature of the extruder 8 was set to 180/210/230/240/240/250/250/250 ℃ in this order. The temperature of a film head of the extruder is 240-250 ℃, a resin melt is cast from a die head of the extruder and forms a film through a quenching cooling roller (the temperature is 15-30 ℃). And obtaining the tab adhesive tape.

(6) Coating a layer of inorganic nano particle sol on the surface of the anti-precipitation friction-resistant modified cpp layer 2 of the tab adhesive tape, wherein the coating speed is 30-80 m/min, the thickness of the sol layer is 0.5-3 mu m, and drying is carried out at 70-110 ℃ for 30-150 seconds to obtain the final tab adhesive tape with smooth and non-adhesive surface. By adding a layer of inorganic nanoparticle sol on the surface of the anti-precipitation friction-resistant modified cpp layer 2, the surface friction performance reduction caused by the precipitation of a lubricant in the anti-precipitation friction-resistant modified cpp layer 2 can be prevented; meanwhile, the thickness of the coating can be better controlled by a coating mode, the thickness of the coating is reasonably controlled, the anti-precipitation friction-resistant modified cpp layer 2 is well protected, the stress concentration phenomenon of the material is reduced, and the strength of the material is improved.