CN217427036U - Pole lug adhesive film for pole lug of lithium battery - Google Patents
Pole lug adhesive film for pole lug of lithium battery Download PDFInfo
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- CN217427036U CN217427036U CN202121661693.0U CN202121661693U CN217427036U CN 217427036 U CN217427036 U CN 217427036U CN 202121661693 U CN202121661693 U CN 202121661693U CN 217427036 U CN217427036 U CN 217427036U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to the technical field of battery safety protection, in particular to a tab adhesive film for a lithium battery tab, which comprises a metallocene modified cpp layer, a high-temperature resistant reticular fiber non-woven fabric layer, a high-temperature resistant pp layer, a high-temperature resistant reticular fiber non-woven fabric layer and a metallocene modified cpp layer which are sequentially stacked from outside to inside; the modified polypropylene pressure-sensitive adhesive layers are coated on two sides of the high-temperature-resistant reticular fiber non-woven fabric layer, and can enter the high-temperature-resistant reticular fiber non-woven fabric layer to increase the cohesiveness, so that the bonding degree of the cpp layer on the outer layer and the middle high-temperature-resistant reticular fiber non-woven fabric layer is strengthened, and the phenomenon of layering among the cpp layer, the pp layer and the high-temperature-resistant reticular fiber non-woven fabric layer is avoided in the recycling process of the battery and under the condition of long-term soaking in electrolyte; two high-temperature-resistant reticular fiber non-woven fabric layers are introduced, so that the short circuit phenomenon under the condition of over-melting is effectively avoided, and the use safety of the battery is ensured.
Description
Technical Field
The utility model belongs to the technical field of the battery safety protection technique and specifically relates to a lithium cell is utmost point ear glued membrane for utmost point ear.
Background
The battery tab is generally formed by hot-pressing and compounding 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. When the packaging of the tab is uneven, the packaging pressure is too high or the packaging temperature is too high, the tab glue and the CPP layer of the aluminum plastic film are excessively melted, and then the metal belt is contacted with the aluminum layer in the middle of the aluminum plastic film after penetrating through the CPP layer of the tab glue and the aluminum plastic film, so that the battery corrosion, the leakage at the tab and the battery flatulence are caused, and the battery short circuit, the battery fire and other safety problems are caused.
Disclosure of Invention
The utility model aims at: the defects in the prior art are overcome, and the tab adhesive film for the lithium battery tab is provided, so that the problem of over-melting is difficult to occur when the tab adhesive film and an aluminum plastic film are subjected to heat sealing.
In order to solve the technical problem, the utility model discloses a technical scheme as follows:
a tab adhesive film for a lithium battery tab comprises a metallocene modified cpp layer, a high-temperature resistant reticular fiber non-woven fabric layer, a high-temperature resistant pp layer, a high-temperature resistant reticular fiber non-woven fabric layer and a metallocene modified cpp layer which are sequentially stacked from outside to inside.
Further, the metallocene-modified cpp layer has a thickness of 10 to 50 μm.
Furthermore, the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer are respectively coated with a layer of modified polypropylene pressure-sensitive adhesive layer.
Further, the thickness of the modified polypropylene pressure-sensitive adhesive layer is 0.1-10 μm;
the modified polypropylene pressure-sensitive adhesive comprises 80-92 wt% of main monomer, 0.2-1 wt% of initiator, 1.5-5 wt% of cross-linking agent, 3-5 wt% of emulsifier and 3-5 wt% of modifier;
the main monomers comprise soft monomers of isooctyl acrylate and butyl acrylate, hard monomers of styrene and functional monomers of acrylic acid,
the initiator is ammonium persulfate;
the cross-linking agent is N-methylol acrylamide;
the emulsifier is selected from one of anionic type, cationic type and nonionic type;
the modifier is organic silicon and rare earth ions Tb 3+ Inorganic nano particles, carbon nano tubes and graphene.
Furthermore, the content of the soft monomer isooctyl acrylate and butyl acrylate in the main monomer is 89.5 wt%, and the mass ratio of the soft monomer isooctyl acrylate to the butyl acrylate is 2: 1; the hard monomer styrene accounted for 7 wt% of the main monomer, and the functional monomer acrylic acid accounted for 3.5 wt% of the main monomer.
Further, the thickness of the high-temperature resistant reticular fiber non-woven fabric layer is 5-50 μm.
Further, the material of the high temperature resistant reticular fiber in the high temperature resistant reticular fiber non-woven fabric layer is selected from one of PEEK, PPS, PAI, PTFE and silicon fluorine resin;
the high-temperature resistant reticular fiber is white, black or yellow in color.
Further, the mesh of the reticular fiber is one of hexagonal, circular and quadrangular.
Furthermore, the thickness of the high-temperature-resistant pp layer is 10-80 μm.
Another object of the utility model is: the preparation method solves the problem of poor plasticizing effect of a multi-layer co-extrusion same-temperature film head on different materials in the prior art.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a preparation method of a pole lug adhesive film for a lithium battery pole lug comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating an extruded metallocene modified cpp layer on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding the color master batch into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
Adopt the technical scheme of the utility model's beneficial effect is:
1. the utility model provides a lithium cell is utmost point ear glued membrane for utmost point ear, at high temperature resistant reticular fiber non-woven fabrics layer both sides coating modified polypropylene pressure sensitive adhesive layer, modified pressure sensitive adhesive layer can get into in the high temperature resistant reticular fiber non-woven fabrics layer, increases the cohesiveness to consolidate the combination degree of outer cpp layer and middle high temperature resistant reticular fiber non-woven fabrics layer, avoid in the battery cyclic use process and soak under the electrolyte condition for a long time, the layering phenomenon appears between cpp layer, pp layer and the high temperature resistant reticular fiber non-woven fabrics layer;
2. the utility model provides a lithium cell is utmost point ear glued membrane for utmost point ear introduces two-layer high temperature resistant reticular fiber non-woven fabrics layer, effectively blocks utmost point ear sheetmetal and aluminium plastic film aluminium lamination contact under the heat-seal overfelting condition, avoids the battery to appear corroding, weeping even short circuit firing phenomenon, effectively avoids the short circuit phenomenon under the overfelting condition, guarantees that the battery is safe in utilization;
3. the utility model provides a lithium cell is utmost point ear glued membrane for utmost point ear, high temperature resistant pp layer adds the masterbatch, can prepare out various colours, is convenient for distinguish fast.
4. The utility model provides a preparation method of pole ear glued membrane for lithium battery pole ear, divide two steps with cpp and pp compound on high temperature resistant reticular fiber non-woven fabrics layer, outer cpp drenches and coats on high temperature resistant reticular fiber non-woven fabrics layer; and the single-layer cast extrusion and the high-temperature-resistant PP layer are subjected to hot-pressing compounding, so that the problem of uneven plasticization of different materials at the same temperature of the film head of the conventional multi-layer co-extruded tab glue can be solved.
Drawings
Fig. 1 is the utility model provides a layer structure schematic diagram of utmost point ear glued membrane for lithium cell utmost point ear.
Fig. 2 is a flow chart of a method for manufacturing a tab adhesive film for a battery tab of the present invention.
In the figure: 1 metallocene modified cpp layer, 2 modified polypropylene pressure sensitive adhesive layer, 3 non-woven fabrics layer, 4 high temperature resistant pp layer.
Detailed Description
The present invention will now be described in further detail with reference to specific embodiments and drawings. The following examples will enable those skilled in the art to more fully understand the present invention, but are not intended to limit the scope of the present invention. Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. 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.
The utility model provides a lithium cell is soft-packing lithium cell.
The content in the utility model is mass percentage content if no special description is provided.
Comparative example:
the utility model provides a lithium cell is utmost point ear glue for utmost point ear, its structure by outer and interior cpp layer, high temperature resistant pp layer and cpp layer in proper order, wherein: the cpp layer is 30 mu m thick, the high-temperature resistant pp layer is 40 mu m thick, the color is transparent white, and the total thickness of the tab glue is 100 mu m.
The preparation method of the tab glue in the comparative example 1 is a conventional method in the field, namely the cpp layer and the pp layer are compounded on the high-temperature-resistant reticular fiber non-woven fabric layer by adopting a one-step method (outer cpp and pp layer laminar flow coextrusion).
The first embodiment is as follows:
a tab adhesive for a lithium battery tab comprises a metallocene modified cpp layer (Singapore polyolefin fs66121, Japan three-well TAFMER XM), a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer, a milky high-temperature resistant pp layer (Shanghai Seikeke S2040, Korea Xiaoxing J945), a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer and a metallocene modified cpp layer from outside to inside in sequence,
wherein the thickness of the metallocene modified cpp layer is 40 μm, the thickness of the modified polypropylene pressure-sensitive adhesive layer is 8 μm, the thickness of the high-temperature resistant mesh fiber non-woven fabric PPS (Wodeff, Nippon Dongli) layer is 8 μm, and the color is yellow; the thickness of the high-temperature resistant pp layer is 20 mu m, and the color is opaque white; the total thickness of the tab glue is 148 mu m.
The modified polypropylene pressure-sensitive adhesive layer comprises the following components in percentage by weight: 92% of main monomer, wherein the soft monomers of isooctyl acrylate and butyl acrylate in the main monomer account for 89.5% of the main monomer, the proportion of the isooctyl acrylate and the butyl acrylate is 2:1, the hard monomer of styrene accounts for 7% of the main monomer, and the functional monomer of acrylic acid accounts for 3.5% of the main monomer; 0.5% of ammonium persulfate, 1.5% of N-hydroxymethyl acrylamide, 3% of anionic emulsifier and 3% of graphene; the specific kind and substance of the anionic emulsifier in the present embodiment are not limited, and may be, for example: sodium stearate or lauric soap, and the like.
High temperature resistant reticular fiber non-woven fabrics layer, high temperature resistant reticular fiber are white PPS, and its mesh is the hexagon, can be regular hexagon or irregular hexagon.
The preparation method of the tab glue for the lithium battery tab in the embodiment comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
Comparative example 1:
the preparation process in this example was carried out according to a conventional preparation method, and the rest was the same as in example 1.
Comparative example 2:
the same as example 1 is the same except that only one high temperature resistant web nonwoven fabric layer is provided in this example.
Example two:
the utility model provides a lithium battery is utmost point ear glue for utmost point ear, its structure by outer and interior in proper order: the composite material comprises a metallocene modified cpp layer, a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer, a milky high-temperature resistant pp layer, a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer and a metallocene modified cpp layer.
Wherein: the thickness of the metallocene modified cpp layer is 20 μm, the thickness of the modified polypropylene pressure-sensitive adhesive layer is 5 μm, the thickness of the high-temperature resistant mesh fiber non-woven PEEK (Germany winning, American Infinity, Italy Latito) layer is 20 μm, and the color is white; the thickness of the high-temperature resistant pp layer is 40 mu m, and the color is transparent white; the total thickness of the tab glue is 140 mu m.
The modified polypropylene pressure-sensitive adhesive layer comprises the following components in percentage by mass: 88.5 percent of main monomer, wherein the soft monomer of isooctyl acrylate and butyl acrylate in the main monomer accounts for 89.5 percent of the content of the main monomer, the proportion of the isooctyl acrylate and the butyl acrylate in the main monomer is 2:1, the hard monomer of styrene accounts for 7 percent of the content of the main monomer, and the functional monomer of acrylic acid accounts for 3.5 percent of the content of the main monomer; 0.5% of ammonium persulfate, 3% of N-hydroxymethyl acrylamide, 3% of anionic emulsifier and 5% of graphene; the specific kind and substance of the anionic emulsifier in the present embodiment are not limited, and may be, for example: sodium stearate or lauric soap, and the like.
The high-temperature resistant reticular fiber non-woven fabric layer is characterized in that the high-temperature resistant reticular fiber is white PEEK, the shape of meshes is quadrilateral, can be regular quadrilateral or irregular quadrilateral, and is preferably regular quadrilateral, such as square, rectangle and parallelogram.
The preparation method of the tab glue for the lithium battery tab in the embodiment comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
Example three:
the utility model provides a lithium battery is utmost point ear glue for utmost point ear, its structure by outer and interior in proper order: the modified polypropylene pressure sensitive adhesive layer is arranged on the metallocene modified cpp layer; a modified polypropylene pressure sensitive adhesive layer and a metallocene modified cpp layer.
Wherein: the thickness of the metallocene modified cpp layer is 20 μm, the thickness of the modified polypropylene pressure sensitive adhesive layer is 3 μm, the thickness of the high temperature resistant reticular fiber non-woven fabric PAI (Deyi new material) layer is 30 μm, the thickness of the high temperature resistant pp layer is 60 μm, the color is black, and the total thickness of the tab adhesive is 172 μm.
The modified polypropylene pressure-sensitive adhesive layer comprises the following components in percentage by mass: 84% of main monomer, wherein the soft monomers of isooctyl acrylate and butyl acrylate in the main monomer account for 89.5% of the main monomer, the proportion of the isooctyl acrylate and the butyl acrylate is 2:1, the hard monomer of styrene accounts for 7% of the main monomer, and the functional monomer of acrylic acid accounts for 3.5% of the main monomer; 1% of ammonium persulfate, 5% of N-methylolacrylamide, 5% of an anionic emulsifier, and 5% of graphene, wherein specific types and substances of the anionic emulsifier in the embodiment are not limited, and may be, for example: sodium stearate or soap laurate, and the like.
The preparation method of the tab glue for the lithium battery tab in the embodiment comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
The tab adhesive product is tested for 180-degree stripping force, high-temperature electrolyte resistance performance index, weather resistance, heat sealing and side voltage (the side voltage is less than 1V, the test is qualified).
The 180 DEG peel force is tested with reference to the GB/T2792-2014 standard. All test data are compared in table 1 below.
Table 1 specific performance tests for each example control.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the description, and must be determined according to the scope of the claims.
Claims (6)
1. The utility model provides a utmost point ear glued membrane for lithium cell utmost point ear which characterized in that: the high-temperature-resistant net-shaped fiber non-woven fabric comprises a metallocene modified cpp layer, a high-temperature-resistant net-shaped fiber non-woven fabric layer, a high-temperature-resistant pp layer, a high-temperature-resistant net-shaped fiber non-woven fabric layer and a metallocene modified cpp layer which are sequentially stacked from outside to inside.
2. The tab film as claimed in claim 1, wherein: the metallocene-modified cpp layer has a thickness of 10 to 50 μm.
3. The tab film as claimed in claim 1, wherein: the thickness of the high-temperature resistant reticular fiber non-woven fabric layer is 5-50 mu m.
4. The tab film as claimed in claim 1, wherein: the high-temperature resistant reticular fiber in the high-temperature resistant reticular fiber non-woven fabric layer is made of one of PEEK, PPS, PAI, PTFE and silicon fluorine resin;
the high-temperature resistant reticular fiber is a white high-temperature resistant reticular fiber layer, a black high-temperature resistant reticular fiber layer or a yellow high-temperature resistant reticular fiber layer.
5. The tab film as claimed in claim 1, wherein: the mesh of the reticular fiber is one of hexagonal, circular and quadrilateral.
6. The tab film for the lithium battery tab as claimed in claim 1, wherein: the thickness of the high-temperature-resistant pp layer is 10-80 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121661693.0U CN217427036U (en) | 2021-07-21 | 2021-07-21 | Pole lug adhesive film for pole lug of lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121661693.0U CN217427036U (en) | 2021-07-21 | 2021-07-21 | Pole lug adhesive film for pole lug of lithium battery |
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| CN217427036U true CN217427036U (en) | 2022-09-13 |
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| CN202121661693.0U Active CN217427036U (en) | 2021-07-21 | 2021-07-21 | Pole lug adhesive film for pole lug of lithium battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115642285A (en) * | 2022-10-10 | 2023-01-24 | 江苏正力新能电池技术有限公司 | Soft package battery and forming method thereof |
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2021
- 2021-07-21 CN CN202121661693.0U patent/CN217427036U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115642285A (en) * | 2022-10-10 | 2023-01-24 | 江苏正力新能电池技术有限公司 | Soft package battery and forming method thereof |
| CN115642285B (en) * | 2022-10-10 | 2024-01-26 | 江苏正力新能电池技术有限公司 | Soft package battery and molding method thereof |
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