CN217438082U - Electrolyte-resistant adhesive tape used inside lithium battery cell - Google Patents
Electrolyte-resistant adhesive tape used inside lithium battery cell Download PDFInfo
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- CN217438082U CN217438082U CN202221558033.4U CN202221558033U CN217438082U CN 217438082 U CN217438082 U CN 217438082U CN 202221558033 U CN202221558033 U CN 202221558033U CN 217438082 U CN217438082 U CN 217438082U
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 62
- 239000002390 adhesive tape Substances 0.000 title claims abstract description 54
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 18
- 239000010410 layer Substances 0.000 claims abstract description 199
- 239000002346 layers by function Substances 0.000 claims abstract description 89
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 66
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims abstract description 64
- 239000012790 adhesive layer Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000003822 epoxy resin Substances 0.000 claims abstract description 20
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 20
- 239000004697 Polyetherimide Substances 0.000 claims abstract description 10
- 229920001601 polyetherimide Polymers 0.000 claims abstract description 10
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 10
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 28
- 229920001187 thermosetting polymer Polymers 0.000 claims description 16
- 229920001577 copolymer Polymers 0.000 claims description 6
- 229920000098 polyolefin Polymers 0.000 claims description 6
- -1 polyethylene terephthalate Polymers 0.000 claims description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920001955 polyphenylene ether Polymers 0.000 claims description 2
- 229920006332 epoxy adhesive Polymers 0.000 claims 4
- 230000005611 electricity Effects 0.000 abstract description 9
- 239000000049 pigment Substances 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 24
- 239000003292 glue Substances 0.000 description 23
- 239000011248 coating agent Substances 0.000 description 17
- 238000000576 coating method Methods 0.000 description 17
- 238000001723 curing Methods 0.000 description 16
- 238000003851 corona treatment Methods 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 9
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000016 photochemical curing Methods 0.000 description 8
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 8
- 229920002799 BoPET Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 229920006335 epoxy glue Polymers 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920000058 polyacrylate Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000006258 conductive agent Substances 0.000 description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 210000002469 basement membrane Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920013636 polyphenyl ether polymer Polymers 0.000 description 1
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Images
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- Adhesive Tapes (AREA)
Abstract
The utility model relates to an electrolyte-resistant sticky tape for inside lithium cell electricity core, including following layer: an outer release agent layer; an intermediate layer comprising a substrate layer and a functional layer; an inner layer of pressure sensitive adhesive; the functional layer is an electrolyte-resistant functional layer, and the electrolyte-resistant functional layer is at least one of an acrylate adhesive layer, an epoxy resin adhesive layer and a thermoplastic polyetherimide adhesive layer; the thickness is 0.1-5 μm. By arranging the functional layer, the electrolyte resistance, the temperature resistance and the mechanical property of the adhesive tape are obviously improved. The functional layer can also be added with pigment, heat conducting agent or electric conducting agent, so that the functional layer further has the functions of color identification, heat conductivity, electric conductivity and the like. The utility model discloses an electrolyte-resistant sticky tape can possess more practical efficiency on keeping its comprehensive properties such as electrolyte-resistant liquid nature basis, satisfies the multiple demand of the inside sticky tape of lithium cell electricity core, has wide market perspective.
Description
Technical Field
The utility model belongs to lithium cell electricity core internal material field especially relates to an electrolyte-resistant sticky tape for inside of lithium cell electricity core.
Background
In recent years, mobile terminals have been developed rapidly, and people are used to perform most operations and tasks in work and life on mobile phones or tablets, watch videos, play games, train on lines, work production, shopping and the like. These operations place more stringent demands on the battery, for example, three factors: endurance time; fast charging; and (4) safety. Similarly, the new energy vehicle impacts the traditional automobile industry with its intellectualization, comfort, technological sense and ultra-strong power experience, and the maturity of its technology and the popularization of products also put the same harsh demands on the power battery as the above three aspects. In order to ensure the safety of the lithium battery, a large number of adhesive tape products are used in application scenes such as pole pieces (for example, preventing lithium precipitation), diaphragm fixation (for example, preventing short circuit in positive and negative electrodes), welding spot protection (for example, preventing welding slag from puncturing the diaphragm), battery cell aluminum plastic film bonding (for example, preventing falling failure), and the like.
Tape products typically include a substrate layer and an adhesive layer. At present, the research and development of the adhesive tape used in the production, assembly and use processes of the lithium battery mainly focuses on the research of the adhesive layer, and the focus is whether the stripping force and the stripping process are degummed and adhered, but the research on the substrate layer or other layers for realizing the protection effect is less. The existing adhesive tape for the lithium battery mostly adopts PET or BOPP materials as a base material layer, is limited by the base material layer, cannot meet the requirements of high temperature, automatic identification, heat conduction, electric conduction, electrolyte resistance, high peeling force and the like, and greatly limits the application field and the scene of the battery.
Patent CN216584834U provides a BOPP-based film for adhesive tape and lithium battery protection adhesive tape using the same. This BOPP basement membrane for sticky tape includes two surfaces of setting up back to back, one of them form on the surface and be used for with the compound corona face of glue film, another form on the surface be used for with the compound non-corona face of release layer. One side of the BOPP base film is subjected to corona treatment, so that the surface energy of the BOPP base film can be improved, and the adhesive force between the BOPP base film and an adhesive layer is further improved; the non-corona surface coating release layer can protect the BOPP base film, so that the BOPP base film has good high-temperature resistance and adhesion is prevented. In order to further improve the adhesion, the adhesive tape can also be compounded with a modified chlorinated polyolefin base coat on the corona surface of the BOPP base film. The utility model discloses a problem that traditional protection sticky tape rises to stick up, the foaming, comes unstuck, the adhesion that appear in the use can be solved to the sticky tape that provides. However, the materials used in the above layers are limited, and the performances of the adhesive tape, such as electrolyte resistance and adhesion, still cannot meet the use requirements of the internal environment of the battery cell.
Therefore, how to improve the comprehensive properties of the adhesive tape product, such as electrolyte resistance, mechanical properties, temperature resistance, and the like, and endow the adhesive tape product with more additional effects, becomes a technical problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the above-mentioned prior art, the utility model aims to provide a be used for inside lithium cell electricity core, have outstanding electrolyte resistance, temperature toleration and mechanical properties concurrently to and the electrolyte resistance sticky tape of additional efficiency such as electrically conductive heat conduction.
Specifically, the utility model provides an electrolyte-resistant sticky tape for inside lithium cell electricity core, a serial communication port, including following layer:
an outer release agent layer;
an intermediate layer comprising a substrate layer and a functional layer;
an inner layer of pressure sensitive adhesive;
the functional layer is an electrolyte-resistant functional layer, and the electrolyte-resistant functional layer is at least one of an acrylate adhesive layer, an epoxy resin adhesive layer and a thermoplastic polyetherimide adhesive layer; the thickness is 0.1-5 μm.
To the concrete inside and outside position relation of substrate layer and functional layer, the utility model discloses do not have and clearly define, increased behind the functional layer, sticky tape wholeness can, especially withstand electrolyte performance obviously improves, promptly the sticky tape can include from the extroversion in proper order:
an outer release agent layer;
a substrate layer;
a functional layer;
an inner layer of pressure sensitive adhesive;
or, the adhesive tape comprises the following components in sequence from outside to inside:
an outer release agent layer;
a functional layer;
a substrate layer;
and a pressure sensitive adhesive inner layer.
Furthermore, the thickness of the outer release agent layer is 0.02-2 μm, preferably 0.05-1 μm, and more preferably 0.08-0.5 μm. The release agent in the release agent outer layer can be selected from release agents commonly used in the field, such as silicon release agents, and can also be selected from non-silicon release agents, such as zinc stearate and the like. The outer layer of the release agent plays a release role and helps the adhesive tape to be normally unwound; if the release agent outer layer is not arranged, the uncured glue can leave residual glue on the back surface of the adhesive tape PET, and the adhesive tape is stretched and deformed due to overlarge unwinding force of the adhesive tape.
Further, the substrate layer is at least one of a polyimide layer, a polyethylene terephthalate layer, a polyphenylene ether layer, a polystyrene layer and a polypropylene layer, and the thickness of the substrate layer is 2-30 m, preferably 4-20 μm, and more preferably 4-12 μm. The substrate layer provides the body intensity of sticky tape, as the carrier of functional layer, release agent skin. In order to improve the adhesive force, at least one side of the base material layer is subjected to corona treatment, and the corona treatment is preferably carried out on two sides of the base material layer according to the technological process and the product adhesive force requirement.
Further, the pressure-sensitive adhesive inner layer is at least one of an acrylic pressure-sensitive adhesive layer, a styrene-isoprene-styrene copolymer (SIS) pressure-sensitive adhesive layer and a polyolefin pressure-sensitive adhesive layer. The inner layer of the pressure-sensitive adhesive provides adhesive force of the adhesive tape, the thickness of the pressure-sensitive adhesive is not specifically limited, and the pressure-sensitive adhesive can be selected according to the actual use requirement of the battery cell. The thickness may be selected to be greater than 2 μm, preferably 4 to 30 μm, in view of adhesion and mechanical properties.
Further, the electrolyte-resistant functional layer is an epoxy resin adhesive layer selected from a thermosetting epoxy resin adhesive layer, a photo-curing epoxy resin adhesive layer or a thermosetting/photo-curing dual-curing epoxy resin adhesive layer. The thermosetting/photocuring dual-curing type epoxy resin adhesive layer is preferably fully cured by a mode of firstly thermosetting and then photocuring reinforcement and shaping, and is particularly suitable for a functional layer with a small thickness to prevent the functional layer from absorbing excessive heat to form defects. The thickness of the electrolyte-resistant functional layer is 0.1-5 μm, preferably 0.1-3 μm.
Optionally, the electrolyte-resistant functional layer is a thermoplastic polyetherimide glue layer, and the thickness of the glue layer is 0.1-5 μm, preferably 0.1-3 μm.
Optionally, the electrolyte-resistant functional layer is an acrylate functional layer, and the thickness of the acrylate functional layer is 0.1-5 μm, preferably 0.1-3 μm.
The functional layer can play a role in blocking electrolyte and improving the strength of the adhesive tape body, the temperature resistance of the adhesive tape, the adhesive force of glue and the like based on the material performance of the functional layer. Also, within the thickness range, the performance is improved as the thickness of the functional layer increases.
Further, the electrolyte-resistant functional layer also has at least one of color, thermal conductivity and electrical conductivity. By adding a pigment, a heat conductive agent or an electric conductive agent to the functional layer, the functional layer further has additional functions such as color recognition, thermal conductivity, electric conductivity and the like. Compared with the situation that the performance of the adhesive tape is easily reduced due to the addition of the auxiliary agents such as the pigment and the like in the inner layer and the like of the pressure-sensitive adhesive, the adhesive tape is damaged undesirably, and the functional auxiliary agents are added into the functional layer, so that the functional layer not only can enable more adhesive tape products, but also can not obviously damage the electrolyte resistance, heat resistance, adhesive force and other performances of the adhesive tape.
Further, the electrolyte-resistant adhesive tape further comprises a release film, wherein the release film is positioned on the surface, opposite to the intermediate layer, of the inner layer of the pressure-sensitive adhesive; the release film is arranged in a peelable manner. The release film is convenient and protective for the production, transportation and other aspects of the adhesive tape, for example, the pressure-sensitive adhesive outer layer is coated on the release film in the production process, so that the subsequent composite process is facilitated, the protective adhesive surface is complete and clean for a long time, and the external adhesive force of the adhesive tape product is ensured.
The utility model discloses, the advantage specifically lies in:
1) the utility model designs the four-layer main body structure, especially sets up the electrolyte resistance function layer, can obviously improve the comprehensive properties of the adhesive tape such as electrolyte resistance, stripping force, temperature tolerance, etc., and provides guarantee for the safe use of the adhesive tape in the battery cell;
2) by adding functional auxiliaries such as pigment, conductive agent and heat conducting agent into the electrolyte-resistant functional layer, the functions of automatic color recognition and heat/electricity conduction are added to the adhesive tape, the requirements of different scenes in the lithium battery are fully met, the additional value of the adhesive tape is improved, and great economic benefits are achieved.
Drawings
FIG. 1 shows a first embodiment of the present invention of an adhesive tape structure
FIG. 2 shows a second embodiment of the present invention
FIG. 3 shows a conventional tape structure
Description of reference numerals: 1. electrolyte-resistant adhesive tapes for use inside lithium battery cells; 2. an outer release agent layer; 3. an intermediate layer; 4. an inner layer of pressure sensitive adhesive; 5. a substrate layer; 6. a functional layer; 7. and (4) a release film.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the following embodiments. It is obvious that the following examples are only a part of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.
The utility model provides an electrolyte-resistant sticky tape (1) for inside lithium cell electricity core, including following layer:
the release agent outer layer (2), the thickness of the release agent outer layer (2) is 0.02-2 μm;
an intermediate layer (3), the intermediate layer (3) comprising a substrate layer (5) and a functional layer (6);
as shown in fig. 1, in the first embodiment, a substrate layer (5) is located between the release agent outer layer (2) and the functional layer (6);
as shown in fig. 2, in the second embodiment, the substrate layer (5) is located between the pressure-sensitive adhesive inner layer (4) and the functional layer (6);
the substrate layer (5) is at least one of a polyimide layer, a polyester layer, a polyphenyl ether layer, a polystyrene layer and a polypropylene layer, and the thickness of the substrate layer is 2-30 mu m; at least one surface of the substrate layer (5) is subjected to corona treatment; preferably, both surfaces of the base material layer (5) are subjected to corona treatment.
The functional layer (6) is an electrolyte-resistant functional layer, and the electrolyte-resistant functional layer is at least one of an acrylate adhesive layer, an epoxy resin adhesive layer and a thermoplastic polyetherimide adhesive layer; the thickness is 0.1-5 μm, preferably 0.1-3 μm. The electrolyte-resistant functional layer is preferably an epoxy resin adhesive layer selected from a thermosetting epoxy resin adhesive layer, a photo-curing epoxy resin adhesive layer or a thermosetting/photo-curing dual-curing epoxy resin adhesive layer; preferably, the electrolyte-resistant functional layer is a thermoplastic polyetherimide adhesive layer; according to actual needs, the electrolyte-resistant functional layer can also be selected from an acrylate adhesive layer.
The electrolyte-resistant functional layer also has at least one of color, thermal conductivity, and electrical conductivity.
The pressure-sensitive adhesive inner layer (4) is at least one of an acrylic pressure-sensitive adhesive layer, a styrene-isoprene-styrene copolymer (SIS) pressure-sensitive adhesive layer and a polyolefin pressure-sensitive adhesive layer; the thickness is greater than 2 μm.
The electrolyte-resistant adhesive tape further comprises a release film (7), wherein the release film (7) is positioned on the surface, opposite to the intermediate layer (3), of the pressure-sensitive adhesive inner layer (4); the release film (7) is arranged in a peelable manner.
The adhesive tape of the utility model is mainly applied by adopting a coating mode, such as a comma coating mode, a dimple coating mode or a slit coating mode. According to different position sequences of the substrate layer (5) and the functional layer (6), the preparation method mainly comprises two modes, and the specific process comprises the following steps:
the first embodiment of the method for preparing a corresponding adhesive tape comprises:
s1: an engineering coating
1.1, preparing functional layer glue;
1.2, placing a substrate layer (5) in a primary placing mode, and carrying out corona treatment on the substrate layer (5);
1.3 coating functional layer glue on the base material layer (5) subjected to corona treatment;
1.4 curing: curing the functional layer glue by using an oven and/or a UV lamp to obtain a functional layer (6);
1.5, rolling and marking a project;
s2: two-step coating
2.1 preparing pressure-sensitive adhesive glue;
2.2, placing the first engineering in a second place, and placing the release film (7) in the first place; preferably, the thickness of the release film (7) is more than or equal to 25 mu m, and the residual rate of the adhesive force is more than or equal to 90 percent;
2.3 coating pressure-sensitive adhesive glue on the release film (7);
2.4, curing in an oven to obtain a pressure-sensitive adhesive inner layer (4);
2.5, laminating and rolling: the inner layer (4) of the pressure-sensitive adhesive is attached to the second functional layer (6); rolling and recording as a second project;
s3: three-step coating
3.1 preparing a release agent solution;
3.2, placing the two projects at the first place, and carrying out corona treatment on the surface of the substrate layer (5) opposite to the functional layer (6);
3.3 coating the release agent solution on the surface of the substrate layer (5) subjected to corona treatment;
3.4, curing in an oven to obtain a release agent outer layer (2);
and 3.5, rolling.
The second embodiment of the method for preparing a corresponding adhesive tape comprises:
s1: an engineering coating
1.1 preparing pressure-sensitive adhesive glue;
1.2, placing the substrate layer (5) in a second place, and placing the release film (7) in a first place; preferably, the specification of the release film (7): the thickness is more than or equal to 25 mu m, and the residual rate of the adhesive force is more than or equal to 90 percent;
1.3, coating pressure-sensitive adhesive glue on a release film (7);
1.4, curing in an oven to obtain a pressure-sensitive adhesive inner layer (4);
1.5, laminating and rolling: the surface of the pressure-sensitive adhesive inner layer (4) opposite to the release film (7) is attached to the second substrate layer (5) and wound; recording as a project;
s2: two-step coating
2.1, preparing functional layer glue;
2.2, placing a project at one place, and carrying out corona treatment on a surface to be bonded of the base material layer (5);
2.3 coating functional layer glue on the surface of the base material layer (5) subjected to corona treatment;
2.4 curing: curing the functional layer glue by using an oven and/or a UV lamp to obtain a functional layer (6);
2.5, winding and marking a second project;
s3: three-step coating
3.1 preparing a mold release agent solution;
3.2, placing the two projects in a first place, and carrying out corona treatment on the surface to be bonded of the functional layer (6);
3.3 coating the release agent solution on the corona-treated surface of the functional layer (6);
3.4, curing in an oven to obtain a release agent outer layer (2);
and 3.5, rolling.
Example 1
The adhesive tape shown in fig. 1 comprises from outside to inside: the release agent comprises a release agent outer layer (2), a base material layer (5), a functional layer (6) and a pressure-sensitive adhesive inner layer (4);
the release agent in the release agent outer layer (2) is dissolved in toluene by using zinc stearate, the release agent outer layer (2) is formed after solidification, and the thickness is controlled to be 0.5 mu m;
the base material layer (5) adopts a PET film layer, the thickness is 4.5 mu m, and the color is transparent;
the functional layer (6) is dissolved by toluene by using thermoplastic polyetherimide glue, a thermoplastic polyetherimide glue layer is formed after solidification, and the thickness is controlled to be 1 mu m;
the pressure-sensitive adhesive inner layer (4) is a polyacrylate pressure-sensitive adhesive layer with the thickness of 5 mu m.
Example 2:
as shown in fig. 2, the adhesive tape comprises, in order from outside to inside: the release agent comprises a release agent outer layer (2), a functional layer (6), a base material layer (5) and a pressure-sensitive adhesive inner layer (4);
the release agent in the release agent outer layer (2) is dissolved in toluene by using zinc stearate, the release agent outer layer (2) is formed after solidification, and the thickness is controlled to be 0.5 mu m;
the functional layer (6) is dissolved in acetone by using thermosetting epoxy glue, a thermosetting epoxy resin glue layer is formed after curing, and the thickness is controlled to be 1 mu m;
the base material layer (5) adopts a PET film layer, the thickness is 4.5 mu m, and the color is transparent;
the pressure-sensitive adhesive inner layer (4) is a polyacrylate pressure-sensitive adhesive layer with the thickness of 5 mu m.
Example 3
As shown in fig. 2, the adhesive tape comprises, from outside to inside: the release agent comprises a release agent outer layer (2), a functional layer (6), a base material layer (5) and a pressure-sensitive adhesive inner layer (4);
the release agent in the release agent outer layer (2) is dissolved in toluene by using zinc stearate, the release agent outer layer (2) is formed after solidification, and the thickness is controlled to be 0.5 mu m;
the functional layer (6) is prepared by using thermosetting/photocuring dual-curing type epoxy resin glue and containing green color paste, dissolving the green color paste by using butyl acetate, and performing thermosetting and post-photocuring to form a dual-curing type epoxy resin glue layer, wherein the thickness is controlled to be 1 mu m;
the base material layer (5) adopts a PET film layer, the thickness is 4.5 mu m, and the color is transparent;
the inner layer (4) of the pressure-sensitive adhesive is made of polyolefin pressure-sensitive adhesive with the thickness of 5 mu m.
Example 4
As shown in fig. 2, the adhesive tape comprises, in order from outside to inside: the release agent comprises a release agent outer layer (2), a functional layer (6), a base material layer (5) and a pressure-sensitive adhesive inner layer (4);
the release agent in the release agent outer layer (2) is dissolved in toluene by using zinc stearate, the release agent outer layer (2) is formed after solidification, and the thickness is controlled to be 0.5 mu m;
the functional layer (6) is dissolved in butyl acetate by using thermosetting epoxy glue, a thermosetting epoxy resin glue layer is formed after curing, and the thickness is controlled to be 2 mu m;
the base material layer (5) adopts a PET film layer, the thickness is 4.5 mu m, and the color is transparent;
the inner layer (4) of the pressure-sensitive adhesive is a styrene-isoprene-styrene copolymer (SIS) system pressure-sensitive adhesive layer with the thickness of 5 μm.
Example 5
As shown in fig. 2, the adhesive tape comprises, in order from outside to inside: the release agent comprises a release agent outer layer (2), a functional layer (6), a base material layer (5) and a pressure-sensitive adhesive inner layer (4);
the release agent in the release agent outer layer (2) is dissolved in toluene by using zinc stearate, the release agent outer layer (2) is formed after solidification, and the thickness is controlled to be 0.5 mu m;
the functional layer (6) is dissolved in butyl acetate by using thermosetting epoxy glue, a thermosetting epoxy resin glue layer is formed after curing, and the thickness is controlled to be 3 mu m;
the base material layer (5) adopts a PET film layer, the thickness is 4.5 mu m, and the color is transparent;
the inner layer (4) of the pressure-sensitive adhesive is a styrene-isoprene-styrene copolymer (SIS) system pressure-sensitive adhesive layer with the thickness of 5 μm.
Comparative example 1
As shown in fig. 3, the three-layer adhesive tape comprises, from outside to inside: the release agent comprises a release agent outer layer (2), a base material layer (5) and a pressure-sensitive adhesive inner layer (4);
the release agent in the release agent outer layer (2) is dissolved in toluene by using zinc stearate, the release agent outer layer (2) is formed after solidification, and the thickness is controlled to be 0.5 mu m;
the base material layer (5) adopts a PET film layer, the thickness is 4.5 mu m, and the color is transparent;
the pressure-sensitive adhesive inner layer (4) is a polyacrylate pressure-sensitive adhesive layer which contains green toner and has the thickness of 6 mu m.
Comparative example 2
As shown in fig. 3, the three-layer adhesive tape comprises, from outside to inside: the release agent comprises a release agent outer layer (2), a base material layer (5) and a pressure-sensitive adhesive inner layer (4);
the release agent in the release agent outer layer (2) is dissolved in toluene by using zinc stearate, the release agent outer layer (2) is formed after solidification, and the thickness is controlled to be 0.5 mu m;
the base material layer (5) adopts a PET film layer, the thickness is 4.5 mu m, and the color is transparent;
the pressure-sensitive adhesive inner layer (4) is a polyacrylate pressure-sensitive adhesive layer with the thickness of 6 mu m.
Performance testing
The following tests were carried out for examples 1-5 and comparative examples 1-2, and the test results are shown in Table 1:
TABLE 1 test results
Discussion of results
In general, examples 1 to 5 of the present invention have higher peeling force due to the addition of the functional layer, and particularly, the peeling force after the immersion of the electrolyte is far higher than that of comparative examples 1 to 2. The function of the functional layer is beneficial to improving the stripping performance of the adhesive tape, and more importantly, the functional layer embodies the excellent electrolyte resistance and still maintains a certain stripping force under the soaking corrosion of the electrolyte. Especially, in examples 3 to 5 using an epoxy resin adhesive layer as a functional layer and using a styrene-isoprene-styrene copolymer (SIS) pressure-sensitive adhesive layer and a polyolefin pressure-sensitive adhesive layer, their peeling forces were maintained at a high level, sufficiently satisfying the safety requirements for use inside a battery cell. And the stripping force is seriously reduced after the comparative examples 1-2 are soaked in the electrolyte, so that huge potential safety hazards exist.
Specifically, in example 1, the thermoplastic polyetherimide adhesive layer is added between the substrate layer and the pressure-sensitive adhesive inner layer, so that the function of priming is achieved, and the external peeling force of the pressure-sensitive adhesive inner layer is remarkably improved.
Although the adhesive tape can be colored by adding pigments such as color paste and the like, the application range of the adhesive tape is expanded, and the adhesive tape has wide application prospect and economic value, the application position of the pigments is also one of factors which can cause the performance of the product to be reduced. In example 3, color was added to the functional layer without significantly affecting the initial peel force, peel force after immersion in electrolyte, etc., whereas in comparative example 1, in the absence of the functional layer, color was added to the pressure-sensitive adhesive inner layer, the pressure-sensitive adhesive inner layer structure was destroyed, the adhesive density was reduced, resulting in an initial peel force of only 60N/m and substantially complete peeling after immersion in electrolyte. Therefore, through a large amount of experiments, the color is preferably given to the functional layer, the comprehensive performance of the adhesive tape is not reduced, and the important contribution of the utility model is also realized.
For the puncture strength, after the functional layer is added in the embodiments 1 to 5 of the utility model, the puncture strength of the adhesive tape is obviously improved compared with the comparative examples 1 to 2, and the puncture strength is obviously improved along with the improvement of the thickness of the functional layer.
In addition, the puncture strength of examples 1 to 5 was reduced to a low extent by the high-temperature treatment, and even the puncture strength of examples 3 to 5 using the epoxy resin adhesive layer as the functional layer was improved by the high-temperature treatment. This is mainly due to the post-curing reinforcement phenomenon of epoxy glue. In contrast, in comparative examples 1 to 2, the puncture strength of the adhesive tape decreased greatly after the application of high temperature, and it was difficult to satisfy the requirement of long-term continuous use.
To sum up, the utility model discloses a set up specific functional layer for the resistant electrolyte solution nature of sticky tape, temperature toleration, mechanical properties obviously improve. And pigment, heat conducting agent or electric conducting agent can be added into the functional layer, so that the functional layer further has the functions of color recognition, heat conductivity, electric conductivity and the like. The utility model discloses an electrolyte-resistant sticky tape can possess more practical efficiency on keeping its comprehensive properties such as electrolyte-resistant liquid on the basis, satisfies the multiple demand of the inside sticky tape of lithium cell electricity core, has wide market perspective.
The foregoing describes preferred embodiments of the present invention, and is intended to provide a clear and concise description of the spirit and scope of the invention, and not to limit the same, but to include all modifications, substitutions, and alterations falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An electrolyte-resistant adhesive tape (1) for the interior of lithium battery cells, characterized in that it comprises the following layers:
a release agent outer layer (2);
an intermediate layer (3), the intermediate layer (3) comprising a substrate layer (5) and a functional layer (6);
an inner layer (4) of pressure-sensitive adhesive;
the functional layer (6) is an electrolyte-resistant functional layer, and the electrolyte-resistant functional layer is at least one of an acrylate adhesive layer, an epoxy resin adhesive layer and a thermoplastic polyetherimide adhesive layer; the thickness is 0.1-5 μm.
2. The electrolyte resistant tape of claim 1, wherein the tape comprises, in order from the outside inward:
a release agent outer layer (2);
a base material layer (5);
a functional layer (6);
an inner layer (4) of pressure-sensitive adhesive;
or, the adhesive tape comprises the following components in sequence from outside to inside:
a release agent outer layer (2);
a functional layer (6);
a base material layer (5);
an inner layer (4) of pressure sensitive adhesive.
3. Electrolyte resistant tape according to claim 1 or 2, characterized in that the release agent outer layer (2) has a thickness of 0.02-2 μm.
4. The electrolyte resistant adhesive tape according to claim 1 or 2, wherein the substrate layer (5) is at least one of a polyimide layer, a polyethylene terephthalate layer, a polyphenylene ether layer, a polystyrene layer, and a polypropylene layer, and has a thickness of 2 to 30 μm.
5. Electrolyte resistant tape according to claim 4, characterized in that at least one side of the substrate layer (5) is corona treated.
6. The electrolyte resistant tape according to claim 1 or 2, wherein the pressure sensitive adhesive inner layer (4) is at least one of an acrylic pressure sensitive adhesive layer, a styrene-isoprene-styrene copolymer (SIS) pressure sensitive adhesive layer, a polyolefin pressure sensitive adhesive layer; its thickness is greater than 2 μm.
7. The electrolyte resistant tape of claim 1 or 2, wherein the electrolyte resistant functional layer is an epoxy adhesive layer selected from a thermosetting epoxy adhesive layer, a photo-curable epoxy adhesive layer, or a thermosetting/photo-curable dual-curing epoxy adhesive layer; the thickness is 0.1 to 3 μm.
8. The electrolyte resistant tape of claim 1 or 2, wherein the electrolyte resistant functional layer is a thermoplastic polyetherimide adhesive layer having a thickness of 0.1 to 3 μm.
9. The electrolyte resistant tape of claim 1 or 2, wherein the electrolyte resistant functional layer further has at least one of color, thermal conductivity, and electrical conductivity.
10. Electrolyte resistant tape according to claim 1 or 2, characterized in that the electrolyte resistant tape (1) further comprises a release film (7), the release film (7) being located on the side of the pressure sensitive adhesive inner layer (4) opposite to the intermediate layer (3); the release film (7) is arranged in a peelable manner.
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|---|---|---|---|
| CN202221558033.4U CN217438082U (en) | 2022-06-21 | 2022-06-21 | Electrolyte-resistant adhesive tape used inside lithium battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221558033.4U CN217438082U (en) | 2022-06-21 | 2022-06-21 | Electrolyte-resistant adhesive tape used inside lithium battery cell |
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| CN217438082U true CN217438082U (en) | 2022-09-16 |
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| CN202221558033.4U Active CN217438082U (en) | 2022-06-21 | 2022-06-21 | Electrolyte-resistant adhesive tape used inside lithium battery cell |
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| CN (1) | CN217438082U (en) |
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