CN113072889A - Thickness swelling adhesive tape special for cylindrical battery and preparation method thereof - Google Patents
Thickness swelling adhesive tape special for cylindrical battery and preparation method thereof Download PDFInfo
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- 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
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/245—Vinyl resins, e.g. polyvinyl chloride [PVC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0209—Multistage baking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C08L31/00—Compositions of 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 an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid; Compositions of derivatives of such polymers
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- C08L31/04—Homopolymers or copolymers of vinyl acetate
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- 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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- C09J2431/00—Presence of polyvinyl acetate
- C09J2431/006—Presence of polyvinyl acetate in the substrate
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2453/00—Presence of block copolymer
- C09J2453/006—Presence of block copolymer in the substrate
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2461/00—Presence of condensation polymers of aldehydes or ketones
- C09J2461/006—Presence of condensation polymers of aldehydes or ketones in the substrate
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Abstract
The invention discloses a thickness swelling adhesive tape special for a cylindrical battery and a preparation method thereof, wherein the thickness swelling adhesive special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, and a substrate solution for forming the substrate layer comprises the following raw materials in parts by weight: PVAC particles: 220-240 parts; SBS particles: 160-180 parts; curing agent: 8-12 parts; catalyst: 0.4-0.8 part; toluene: 800-1200 parts of isopropanol and 8-12 parts of isopropanol; the adhesive tape can be swelled in the thickness direction, the swelling value can reach more than 400%, the adhesive tape after swelling can be used for filling the gap between the battery core and the cylindrical shell of the cylindrical battery in an all-round manner, the battery core and the cylindrical shell of the cylindrical battery can be effectively fixed, and damage to the battery caused by vibration or impact is avoided.
Description
Technical Field
The invention belongs to the technical field of adhesive tapes, and particularly relates to a thickness swelling adhesive tape special for a cylindrical battery and a preparation method thereof.
Background
When the cylindrical battery is assembled, a certain gap exists between the battery core and the cylindrical shell, if the battery core cannot be effectively fixed in the shell, the battery core can move in the shell after vibration or external impact occurs, so that the internal resistance of the battery can be increased or electrode plates can be damaged, and the performance of the battery can be greatly degraded. Therefore, during assembly, the gap must be filled while achieving effective adhesion of the cell to the cylindrical housing.
CN111518481A discloses a swelling tape special for lithium batteries and a manufacturing process thereof, which comprises a substrate layer and a pressure-sensitive adhesive layer coated on the substrate layer, wherein the substrate layer still keeps higher area swelling when electrolyte is reduced or removed by adding TPU particles, EVA particles, styrene resin solution, titanium dioxide pigment paste and other substances in the manufacturing process of the substrate layer, the pressure-sensitive adhesive layer is not dissolved after soaking the electrolyte, and still has viscosity in the electrolyte environment, the swelling tape special for lithium batteries prepared by the process can swell and deform in the length and width directions after the swelling tape special for lithium batteries contacts the electrolyte of lithium batteries, and the area is enlarged to more than 200% of the original area. This technique can only achieve swelling deformation of the adhesive tape in the length-width direction to form a folded filling gap, but it cannot fill the gap in the cylindrical battery in all directions.
Disclosure of Invention
In order to solve the technical problems, the invention provides a special thickness swelling adhesive tape for a cylindrical battery and a preparation method thereof, the adhesive tape can swell in the thickness direction, the swelling value can reach more than 400 percent at most, the swollen adhesive tape can fill the gap between the battery core and the cylindrical shell of the cylindrical battery in an all-around manner, the battery core and the cylindrical shell of the cylindrical battery can be effectively fixed, and the damage to the battery caused by vibration or impact is avoided.
The technical scheme adopted by the invention is as follows:
the thickness swelling adhesive special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, wherein a substrate liquid for forming the substrate layer comprises the following raw materials in parts by weight:
PVAC particles: 220-240 parts;
SBS particles: 160-180 parts;
curing agent: 8-12 parts;
catalyst: 0.4-0.8 part;
toluene: 800-1200 parts;
8-12 parts of isopropanol.
The PVAC particles are polyvinyl acetate plastic particles with the molecular weight of 10-40 ten thousand; the PVAC particles in the molecular weight range have good solubility in toluene, and can ensure that a substrate layer in the adhesive tape can fully absorb a solvent in an electrolyte in the electrolyte to present good swelling multiplying power; if the molecular weight is too high, the solubility in toluene is poor, and the thickness swelling effect in the electrolyte cannot be ensured; if the molecular weight is too low, even by crosslinking of the curing agent and the catalyst, the tape is not guaranteed to be insoluble, and the thickness swelling effect is not satisfactory.
The SBS particles are star-shaped styrene-butadiene-styrene block copolymer plastic particles with the molecular weight of 14-30 ten thousand; the adhesive tape can ensure that the SBS crosslinked with the PVAC can fix the structure of the adhesive tape when the electrolyte swells and dissolves the PVAC particles, thereby realizing the swelling in the thickness direction and ensuring that the PVAC is not dissolved.
The curing agent is amino resin; the amino resin is preferably amino resin 582-2 or amino resin 590-3.
The catalyst is an organic acid catalyst; the organic acid catalyst is preferably any one or more of p-toluenesulfonic acid, sulfamic acid and oxalic acid.
The thickness of the substrate layer is 30-50 mu m, and if the thickness is too thick, the thickness of the adhesive tape is thicker, so that a battery manufacturer cannot automatically load the adhesive tape into a steel shell of a cylindrical battery when using the adhesive tape; too thin can result in the hardness of sticky tape to be low, and the sticky tape is easily creased when the battery producer uses on-line, appears the rubberizing badly.
The thickness of the pressure-sensitive adhesive layer is 3-10 mu m, and if the thickness is too thick, the thickness of the adhesive tape is thicker, so that a battery manufacturer cannot automatically load the adhesive tape into a steel shell of a cylindrical battery when in use; too thin may result in insufficient adhesion of the tape to the cell.
The preparation method of the thickness swelling adhesive tape special for the cylindrical battery comprises the following steps:
(1) dissolving PVAC particles and SBS particles by toluene to obtain a first mixed solution; diluting a curing agent with toluene to obtain a second mixed solution, and diluting a catalyst with isopropanol to obtain a third mixed solution; adding the mixed solution II and the mixed solution III into the mixed solution I, stirring and mixing uniformly, and filtering to obtain a base solution;
(2) coating the substrate liquid on the release surface of the PET single-sided silicon release film, drying, forming a substrate layer on the PET single-sided silicon release film, and carrying out corona treatment on the substrate layer;
(3) coating pressure-sensitive adhesive glue on the release surface of the PET single-sided silicon release film, and forming a pressure-sensitive adhesive layer on the PET single-sided silicon release film after drying;
(4) compounding the base layer subjected to corona treatment with the pressure-sensitive adhesive layer, and then curing, cooling, rewinding and cutting to obtain the thickness swelling adhesive tape special for the cylindrical battery.
In the step (1), the stirring and mixing is to control the temperature at 20-50 ℃, and stir and mix for 2-3h at a stirring speed of 600-.
In the step (1), the filtration is performed by using a 300-400-mesh double-layer filter screen; the filter screen is easy to break due to single-layer filtration, the filtering is insufficient due to too low mesh number, lines are easy to appear in coating, and the filtering efficiency is too low due to too high mesh number and cannot keep up with the coating speed.
In the step (2), coating is carried out at the speed of 8-12 m/min; then, the mixture enters an oven to be dried at the same speed, and the temperatures of 1-8 sections of the oven are respectively 50, 90, 100, 110, 120, 130, 90 and 50 ℃; if the speed is too slow, the base solution can be excessively crosslinked in the drying process, and the swelling effect is poor; the solvent is not uniformly dried at too high speed, a large number of small bubbles are easily generated on the basal layer, the appearance is influenced, the cross-linking degree is not enough, the dissolving risk is easily generated, and the service life of the adhesive tape is shortened; when drying, the temperature in the middle section slowly rises to ensure even baking solvent, and the occurrence of small bubbles on the basal layer is avoided.
In the step (2), the corona value of the substrate layer is more than or equal to 52 dyne, and if the corona value is too low, the bonding between the substrate layer and the pressure-sensitive adhesive layer is not firm, so that the degumming phenomenon is easy to occur.
In the step (2), the thickness of the PET single-sided silicon release film is 25-50 μm, and if the PET single-sided silicon release film is too thin, the base layer takes the glue solution into an oven, and then due to the shrinkage effect of the base layer in the volatilization process of the baking solvent, the two sides of the base layer can be curled, so that the next procedure is inconvenient to carry out; too thick material is wasted; the purpose of using the PET single-sided silicon release film is to facilitate the shaping and peeling of the substrate layer.
In the step (3), before coating and coating the pressure-sensitive adhesive, the pressure-sensitive adhesive is stirred and mixed for 40-60min at the temperature of 20-40 ℃ and the stirring speed of 600 revolutions per minute, and then filtered by a 400-mesh 500-mesh double-layer filter screen. Under such conditions, the pressure-sensitive adhesive glue can be uniformly stirred and simultaneously in a state of being beneficial to coating, and the uniformity and the flatness of the adhesive layer can be ensured without lines during coating through sufficient filtration.
In the step (3), coating is carried out at the speed of 25-35 m/min; then the mixture enters an oven to be dried at the same speed, and the temperatures of 1-8 sections of the oven are respectively 50 ℃, 90 ℃, 110, 120, 130, 90 and 50 ℃. Too low efficiency if the speed is too slow; if the speed is too high, the solvent is not dried completely, and the degumming phenomenon is easy to occur; the above-mentioned drying temperature can ensure that the solvent can be fully volatilized and the pressure-sensitive adhesive layer can be fully crosslinked at a higher speed.
In the step (3), the thickness of the PET single-sided silicon release film is 15-30 μm, and if the PET single-sided silicon release film is too thin, the requirement on the tension of a coating machine is very high, and the substrate is easy to wrinkle in an oven; too thick material is wasted; the purpose of using the PET single-sided silicon release film is to facilitate transfer bonding of the pressure-sensitive adhesive layer to the substrate layer.
In the step (4), the curing is carried out for 48-72 hours at 50 ℃ so as to fully compound the substrate layer and the pressure-sensitive adhesive layer.
According to the thickness swelling adhesive tape special for the cylindrical battery, provided by the invention, the selection of the base layer raw material is controlled to swell in the thickness direction, so that the gap between the battery core and the cylindrical shell of the cylindrical battery can be filled in an all-around manner, the battery core and the cylindrical shell of the cylindrical battery can be effectively fixed, and the damage to the battery caused by vibration or impact is avoided.
According to the preparation method of the thickness swelling adhesive tape special for the cylindrical battery, the base layer and the pressure-sensitive adhesive layer are uniformly coated by controlling the base liquid mixing condition, the pressure-sensitive adhesive liquid mixing condition and the coating speed; the temperature of each section of the oven is controlled to further control the crosslinking speed of the base layer raw material and the sufficient crosslinking of the pressure-sensitive adhesive layer raw material, so that the preparation of the thickness swelling adhesive tape special for the cylindrical battery is realized.
Compared with the prior art, the thickness swelling adhesive tape special for the cylindrical battery is simple in structure and low in cost, can realize thickness swelling in different degrees in electrolytes with different temperatures, and has a swelling value of 180-250% in the electrolyte with the temperature of 45 ℃, 195-275% in the electrolyte with the temperature of 50 ℃, 205-335% in the electrolyte with the temperature of 60 ℃ and 220-430% in the electrolyte with the temperature of 85 ℃.
The thickness swelling adhesive tape special for the cylindrical battery can be used for performing thickness swelling in solvents such as dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, methyl propyl carbonate, propylene carbonate, ethylene carbonate and propylene carbonate, and can be used for performing thickness swelling in electrolytes containing the solvents so as to comprehensively fill a gap between a battery core and a cylindrical shell of the cylindrical battery, so that the effective fixation of the battery core and the cylindrical shell of the cylindrical battery is realized, and the damage to the battery caused by vibration or impact is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a thickness swelling tape for a cylindrical battery according to the present invention before contacting an electrolyte;
FIG. 2 is a schematic structural diagram of the thickness swelling tape for cylindrical batteries according to the present invention after contacting with an electrolyte;
in the figure: 51a is the swelling tape special for lithium battery before contacting with electrolyte, 51b is the swelling tape special for lithium battery after contacting with electrolyte, 52 is the lithium ion battery shell component, and 53 is the lithium ion battery shell component.
Detailed Description
The present invention will be described in detail with reference to examples.
The PVAC particles used in the present invention are sold under the trade name S3343T, available from Nintendo New Material science and technology, Inc.
The SBS granules used in the invention are of the brand 1184 and are purchased from Songchuan chemical.
The pressure-sensitive adhesive used in the invention is a halloysite 8243.
Example 1
The thickness swelling adhesive tape special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, wherein the substrate layer is formed by the following raw materials in parts by weight: 240 parts of PVAC particles, 160 parts of SBS particles, 582-28 parts of amino resin, 0.6 part of p-toluenesulfonic acid, 1000 parts of toluene and 10 parts of isopropanol.
The preparation method of the thickness swelling adhesive tape special for the cylindrical battery comprises the following steps:
(1) dissolving PVAC particles and SBS particles in a formula amount by using 80 parts of toluene to obtain a first mixed solution; diluting amino resin 582-2 with the formula amount by 20 parts of toluene to obtain a second mixed solution; diluting p-toluenesulfonic acid by 10 parts of isopropanol to obtain a mixed solution III; at room temperature, adding the second mixed solution and the third mixed solution into the first mixed solution, stirring and mixing for 2-3h at a stirring speed of 600-;
(2) coating the base solution on a release surface of a PET single-sided silicon release film with the thickness of 25-50 mu m at the speed of 8-12m/min, then, drying the PET single-sided silicon release film in an oven at the same speed, wherein the temperatures of 1-8 sections of the oven are respectively 50, 90, 100, 110, 120, 130, 90 and 50 ℃, forming a base layer with the thickness of 30-50 mu m on the PET single-sided silicon release film after drying, and carrying out corona treatment on the base layer, wherein the corona value of the base layer is more than or equal to 52 dyne;
(3) stirring and mixing pressure-sensitive adhesive glue for 40-60min at the stirring speed of 400-;
(4) compounding the base layer subjected to corona treatment with a pressure-sensitive adhesive layer;
(5) curing the material in the step (4) at 50 ℃ for 48-72h, cooling for more than 6h, rewinding according to the length required by a client to remove two layers of release films;
(6) and (5) cutting the material into corresponding widths according to the requirements of customers, and thus obtaining the finished product of the special thickness swelling adhesive tape for the cylindrical battery.
Example 2
The thickness swelling adhesive tape special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, wherein the substrate layer is formed by the following raw materials in parts by weight: 240 parts of PVAC particles, 160 parts of SBS particles, 582-210 parts of amino resin, 0.6 part of p-toluenesulfonic acid, 1000 parts of toluene and 10 parts of isopropanol.
The preparation method of the thickness swelling adhesive tape special for the cylindrical battery comprises the following steps:
(1) dissolving PVAC particles and SBS particles in a formula amount by using 80 parts of toluene to obtain a first mixed solution; diluting amino resin 582-2 with the formula amount by 20 parts of toluene to obtain a second mixed solution; diluting p-toluenesulfonic acid by 10 parts of isopropanol to obtain a mixed solution III; at room temperature, adding the second mixed solution and the third mixed solution into the first mixed solution, stirring and mixing for 2-3h at a stirring speed of 600-;
(2) coating the base solution on a release surface of a PET single-sided silicon release film with the thickness of 25-50 mu m at the speed of 8-12m/min, then, drying the PET single-sided silicon release film in an oven at the same speed, wherein the temperatures of 1-8 sections of the oven are respectively 50, 90, 100, 110, 120, 130, 90 and 50 ℃, forming a base layer with the thickness of 30-50 mu m on the PET single-sided silicon release film after drying, and carrying out corona treatment on the base layer, wherein the corona value of the base layer is more than or equal to 52 dyne;
(3) stirring and mixing pressure-sensitive adhesive glue for 40-60min at the stirring speed of 400-;
(4) compounding the corona treated substrate layer with the pressure sensitive adhesive layer
(5) Curing the material in the step (4) at 50 ℃ for 48-72h, cooling for more than 6h, rewinding according to the length required by a client to remove two layers of release films;
(6) and (5) cutting the material into corresponding widths according to the requirements of customers, and thus obtaining the finished product of the special thickness swelling adhesive tape for the cylindrical battery.
Example 3
The thickness swelling adhesive tape special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, wherein the substrate layer is formed by the following raw materials in parts by weight: 240 parts of PVAC particles, 160 parts of SBS particles, 582-212 parts of amino resin, 0.6 part of p-toluenesulfonic acid, 1000 parts of toluene and 10 parts of isopropanol.
The preparation method of the thickness swelling adhesive tape special for the cylindrical battery comprises the following steps:
(1) dissolving PVAC particles and SBS particles in a formula amount by using 80 parts of toluene to obtain a first mixed solution; diluting amino resin 582-2 with the formula amount by 20 parts of toluene to obtain a second mixed solution; diluting p-toluenesulfonic acid by 10 parts of isopropanol to obtain a mixed solution III; at room temperature, adding the second mixed solution and the third mixed solution into the first mixed solution, stirring and mixing for 2-3h at a stirring speed of 600-;
(2) coating the base solution on a release surface of a PET single-sided silicon release film with the thickness of 25-50 mu m at the speed of 8-12m/min, then, drying the PET single-sided silicon release film in an oven at the same speed, wherein the temperatures of 1-8 sections of the oven are respectively 50, 90, 100, 110, 120, 130, 90 and 50 ℃, forming a base layer with the thickness of 30-50 mu m on the PET single-sided silicon release film after drying, and carrying out corona treatment on the base layer, wherein the corona value of the base layer is more than or equal to 52 dyne;
(3) stirring and mixing pressure-sensitive adhesive glue for 40-60min at the stirring speed of 400-;
(4) and compounding the base layer subjected to corona treatment with the pressure-sensitive adhesive layer.
(5) Curing the material in the step (4) at 50 ℃ for 48-72h, cooling for more than 6h, rewinding according to the length required by a client to remove two layers of release films;
(6) and (5) cutting the material into corresponding widths according to the requirements of customers, and thus obtaining the finished product of the special thickness swelling adhesive tape for the cylindrical battery.
Comparative example 1
The thickness swelling adhesive tape special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, wherein the substrate layer is formed by the following raw materials in parts by weight: 400 parts of PVAC particles, 210 parts of amino resin 582-.
The preparation method of the thickness swelling tape special for the cylindrical battery is the same as that of the embodiment 2.
Comparative example 2
The thickness swelling adhesive tape special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, wherein the substrate layer is formed by the following raw materials in parts by weight: 400 parts of SBS particles, 582-210 parts of amino resin, 0.6 part of p-toluenesulfonic acid, 1000 parts of toluene and 10 parts of isopropanol.
The preparation method of the thickness swelling tape special for the cylindrical battery is the same as that of the embodiment 2.
Comparative example 3
The thickness swelling adhesive tape special for the cylindrical battery comprises a pressure-sensitive adhesive layer and a substrate layer, wherein the substrate layer is formed by the following raw materials in parts by weight: 300 parts of PVAC particles, 100 parts of SBS particles, 582-210 parts of amino resin, 0.6 part of p-toluenesulfonic acid, 1000 parts of toluene and 10 parts of isopropanol.
The preparation method of the thickness swelling tape special for the cylindrical battery is the same as that of the embodiment 2.
The thickness swelling tape for cylindrical batteries in each of the above examples and comparative examples was tested for steel plate peeling force, tape thickness, and swelling value in electrolytes at different temperatures.
The test method for the peeling force of the steel plate refers to the GB/T2792-2014 standard.
The total thickness test method refers to GB/T7125-.
The test method for swelling at 45 ℃ is as follows: 1) the total thickness h0 of the reference GB/T7125-; 2) cutting the test sample into 50mm by 50mm size to prepare 5 pieces; 3) putting the cut adhesive tape into a PE bottle, pouring electrolyte into the PE bottle to immerse a sample, and baking the PE bottle for 36 hours at the temperature of 45 ℃; 4) then taking out the sample, flattening the sample, testing the length a and the width b of the sample by using a 30cm steel ruler (confirming that the shrinkage in the length and width directions is less than or equal to 10%), and simultaneously testing the thickness h1 of the sample after the electrolyte is soaked and baked according to the GB/T7125-; 5) swelling ratio h1/h0 100%.
The test method of swelling at 50 ℃ is the same as the test method of swelling at 45 ℃ except that the baking temperature and time in step 3) are changed to baking at 50 ℃ for 96 hours.
The test method of swelling at 60 ℃ is the same as the test method of swelling at 45 ℃ except that the baking temperature and time in step 3) are changed to baking at 60 ℃ for 48 hours.
The test method of swelling at 85 ℃ is the same as the test method of swelling at 45 ℃ except that the baking temperature and time in step 3) are changed to baking at 85 ℃ for 4 hours.
The design of different temperature and time for swelling at 45-60 ℃ is designed by referring to the commonly used formation baking temperature of a cylindrical battery manufacturer, and belongs to the simulated actual use environment of a client; swelling at 85 ℃ is an evaluation of rapid detection during production.
The results of the above tests are shown in table 1.
TABLE 1
Note: the peel force test is a value of 3 samples selected at random; the total thickness is the value tested for 3 samples selected at random; the swelling value is the average of the swelling values of 3 samples tested, which were randomly selected
As can be seen from the data in the above table, the thickness swelling tape for cylindrical batteries prepared in the examples of the present invention has a good swelling value in the electrolyte. The best results are obtained in example 2. In example 1, because the amount of the amino resin 582-2 serving as the curing agent is small, crosslinking is insufficient, and part of high polymers are not completely locked and dissolved in the electrolyte, the swelling thickness is thinner than that of example 2, but the use requirement can be met; example 3 because the curing agent amino resin 582-2 is too much, the crosslinking is too sufficient, and under the same conditions, the solvent molecules in the electrolyte are more difficult to enter, so the swelling thickness is thinner than that of example 2, but the use requirement can also be met. In contrast, in comparative example 1, the adhesive tape was dissolved in the electrolyte due to the absence of SBS particles in the substrate layer; in comparative example 2, the swelling effect of the adhesive tape in the electrolyte was not good because no PVAC particles were used; in comparative example 2, the swelling effect of the adhesive tape in the electrolyte was not good due to the unreasonable mixture ratio of the PVAC particles and the SBS particles.
In summary, the thickness swelling tape dedicated for cylindrical batteries provided by the invention can comprehensively fill the gap between the battery core and the cylindrical shell of the cylindrical battery by controlling the selection of the base layer raw material to swell in the thickness direction, so as to effectively fix the battery core and the cylindrical shell of the cylindrical battery and avoid damage to the battery caused by vibration or impact.
The above detailed description of a thickness swelling tape for cylindrical batteries and a method for preparing the same with reference to the examples is illustrative and not restrictive, and several examples may be cited within the scope of the present invention, so that variations and modifications thereof without departing from the general concept of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The thickness swelling adhesive tape special for the cylindrical battery is characterized by comprising a pressure-sensitive adhesive layer and a substrate layer, wherein a substrate solution for forming the substrate layer comprises the following raw materials in parts by weight:
PVAC particles: 220-240 parts;
SBS particles: 160-180 parts;
curing agent: 8-12 parts;
catalyst: 0.4-0.8 part;
toluene: 800-1200 parts;
8-12 parts of isopropanol.
2. The thickness swelling tape for cylindrical batteries according to claim 1, wherein the PVAC particles are polyvinyl acetate plastic particles with molecular weight between 10-40 ten thousand.
3. The thickness swelling tape for cylindrical batteries according to claim 1, wherein the SBS particles are star-shaped styrene-butadiene-styrene block copolymer plastic particles having a molecular weight of 14-30 ten thousand.
4. The thickness swelling tape for cylindrical batteries according to claim 1, wherein the curing agent is an amino resin; the catalyst is an organic acid catalyst.
5. The thickness swelling tape for cylindrical batteries according to claim 1, wherein the thickness of the base layer is 30-50 μm.
6. The thickness swelling tape for cylindrical batteries according to claim 1, wherein the thickness of the pressure-sensitive adhesive layer is 3 to 10 μm.
7. The method for preparing the thickness swelling tape specially used for cylindrical batteries according to any one of claims 1 to 6, wherein the method for preparing the thickness swelling tape specially used for cylindrical batteries comprises the following steps:
(1) dissolving PVAC particles and SBS particles by toluene to obtain a first mixed solution; diluting a curing agent with toluene to obtain a second mixed solution, and diluting a catalyst with isopropanol to obtain a third mixed solution; adding the mixed solution II and the mixed solution III into the mixed solution I, stirring and mixing uniformly, and filtering to obtain a base solution;
(2) coating the substrate liquid on the release surface of the PET single-sided silicon release film, drying, forming a substrate layer on the PET single-sided silicon release film, and carrying out corona treatment on the substrate layer;
(3) coating pressure-sensitive adhesive glue on the release surface of the PET single-sided silicon release film, and forming a pressure-sensitive adhesive layer on the PET single-sided silicon release film after drying;
(4) compounding the base layer subjected to corona treatment with the pressure-sensitive adhesive layer, and then curing, cooling, rewinding and cutting to obtain the thickness swelling adhesive tape special for the cylindrical battery.
8. The method as claimed in claim 7, wherein in the step (1), the stirring and mixing is performed by controlling the temperature at 20-50 ℃ and stirring and mixing at a stirring speed of 600-800 rpm for 2-3 h; the filtration is performed by using a 300-400-mesh double-layer filter screen.
9. The preparation method according to claim 7, characterized in that in the step (2), coating is carried out at a speed of 8-12m/min, and then the coating enters an oven to be dried at the same speed, wherein the temperatures of 1-8 sections of the oven are respectively 50, 90, 100, 110, 120, 130, 90 and 50 ℃; the corona value of the base layer is greater than or equal to 52 dyne.
10. The production method according to claim 7, wherein in the step (3), the coating is performed at a speed of 25 to 35 m/min; then the mixture enters an oven to be dried at the same speed, and the temperatures of 1-8 sections of the oven are respectively 50 ℃, 90 ℃, 110, 120, 130, 90 and 50 ℃.
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| US20110217589A1 (en) * | 2010-03-03 | 2011-09-08 | Sony Corporation | Cylindrical nonaqueous electrolyte battery |
| JP2015028842A (en) * | 2013-06-28 | 2015-02-12 | 日本ゼオン株式会社 | Adhesive agent for lithium ion secondary batteries, lithium ion secondary battery separator, and lithium ion secondary battery |
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