CN117801695A - Composite adhesive tape for protecting lithium ion battery tab - Google Patents
Composite adhesive tape for protecting lithium ion battery tab Download PDFInfo
- Publication number
- CN117801695A CN117801695A CN202211172539.6A CN202211172539A CN117801695A CN 117801695 A CN117801695 A CN 117801695A CN 202211172539 A CN202211172539 A CN 202211172539A CN 117801695 A CN117801695 A CN 117801695A
- Authority
- CN
- China
- Prior art keywords
- adhesive tape
- film
- composite adhesive
- composite
- hb358qf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002390 adhesive tape Substances 0.000 title claims abstract description 41
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 33
- 229920002799 BoPET Polymers 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 229920000642 polymer Polymers 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000002985 plastic film Substances 0.000 claims description 6
- 229920006255 plastic film Polymers 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 229920000098 polyolefin Polymers 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000853 adhesive Substances 0.000 abstract description 10
- 230000001070 adhesive effect Effects 0.000 abstract description 10
- 229910052744 lithium Inorganic materials 0.000 abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003792 electrolyte Substances 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 239000011888 foil Substances 0.000 abstract description 4
- 238000010292 electrical insulation Methods 0.000 abstract description 3
- 239000004743 Polypropylene Substances 0.000 description 25
- 239000010410 layer Substances 0.000 description 22
- 239000000919 ceramic Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 239000002033 PVDF binder Substances 0.000 description 4
- 239000007888 film coating Substances 0.000 description 4
- 238000009501 film coating Methods 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 238000007581 slurry coating method Methods 0.000 description 4
- 239000011268 mixed slurry Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010345 tape casting Methods 0.000 description 3
- 229910001593 boehmite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910006636 γ-AlOOH Inorganic materials 0.000 description 1
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to the technical field of lithium batteries, in particular to a composite adhesive tape for protecting a lithium ion battery tab, which comprises a composite adhesive tape body, wherein the composite adhesive tape body comprises a composite film layer arranged on a PET film; the composite film layer comprises a PP film and an HB358QF layer; the HB358QF layer is provided with a PP film; it has good electrical insulation. The withstand voltage reaches 3600V; the stability is excellent, and the electrolyte corrosion resistance is realized; and the adhesive strength is high, the adhesive strength with aluminum materials (aluminum foils) is high, and the strength still meets the strength requirement under the electrolyte corrosion condition.
Description
Technical Field
The invention relates to the technical field of lithium battery glue, in particular to a composite adhesive tape for protecting a lithium ion battery tab.
Background
In the process of manufacturing a cathode (anode) pole piece of a lithium battery (whether a ternary product or a lithium iron phosphate product), in order to protect a pole lug, burrs generated during die cutting of the pole lug are prevented from piercing a diaphragm to generate internal short circuits, the safety performance of the lithium battery is improved, and manufacturers of the lithium battery use alumina (Al) 2 O 3 ) Or boehmite (gamma-AlOOH), and mixed slurry of PVDF and NMP (called ceramic slurry) are added to coat the two sides of the cathode main material. Through the procedures of coating, baking and cold pressing (rolling), the mixed slurry forms a compact protective layer attached to the lug part. The ceramic paste coating for tab protection has established industry standards for use in almost all cell manufacturers.
There are two major disadvantages to existing ceramic coating protection schemes:
(1) The production process is complicated, the efficiency is low, and the consistency is poor. The lug ceramic slurry coating needs vacuum stirring, coating, baking and cold pressing procedures, and has the defects of complicated manufacturing process, low efficiency and poor consistency (coating thickness).
(2) The cost is high. Two factors: material cost: since the mixed slurry contains high-priced raw materials such as PVDF, the ceramic slurry is expensive. Non-material cost: because of complex process, occupation of sites and personnel and low production efficiency, the cost of non-materials is high.
Disclosure of Invention
The invention aims to provide a composite adhesive tape for protecting a lithium ion battery tab, aiming at the defects and the shortcomings of the prior art.
The invention relates to a composite adhesive tape for protecting a lithium ion battery tab, which comprises a composite adhesive tape body, wherein the composite adhesive tape body comprises a composite film layer arranged on a PET film;
the composite film layer comprises a PP film and an HB358QF layer; and a PP film is arranged on the HB358QF layer.
Further, the HB358QF layer comprises the following components in percentage by mass:
30% -60% of HC318BF material and 40% -70% of PP119HC material.
Further, the PP film is made of plastic film, and the HB358QF layer is made of polyolefin insulating high polymer.
Further, the PP film has a thickness of 6 μm to 12. Mu.m.
Further, the thickness of the HB358QF layer is 6 μm-12 μm.
The preparation method of the composite adhesive tape for protecting the lithium ion battery tab comprises the following steps:
step one: unreeling the PET film;
step two: preheating PP particles and HB358 QF;
step three: extruding the bilayer polymer melt from the die head in an extruder and coating the bilayer polymer melt on the PET substrate according to a preset thickness;
step four: the cooling roller is rolled up and the adhesive tape is attached;
step five: the cutting device cuts according to the size specified by the user.
The invention has the beneficial effects that: the composite adhesive tape for protecting the lithium ion battery tab has good electrical insulation property. The withstand voltage reaches 3600V; the stability is excellent, and the electrolyte corrosion resistance is realized; and the adhesive strength is high, the adhesive strength with aluminum materials (aluminum foils) is high, and the strength still meets the strength requirement under the electrolyte corrosion condition.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and together with the description serve to explain the invention, if necessary:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic representation of the adhesive strength of HB358QF layers in the present invention.
Reference numerals illustrate:
a composite adhesive tape body-1; PET film-11; composite membrane layer-12; PP film-121; HB358QF layer-122.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and the description are for the purpose of illustrating the invention only and are not to be construed as limiting the invention.
As shown in fig. 1, a composite adhesive tape for protecting a tab of a lithium ion battery according to the present embodiment includes a composite adhesive tape body 1, wherein the composite adhesive tape body 1 includes a composite film layer 12 disposed on a PET film 11;
the composite film layer 12 includes a PP film 121 and an HB358QF layer 122; the HB358QF layer 122 is provided with a PP film 121.
Further, the HB358QF layer comprises the following components in percentage by mass:
30% -60% of HC318BF material and 40% -70% of PP119HC material.
Further, the PP film is made of plastic film, and the HB358QF layer is made of polyolefin insulating high polymer.
Further, the PP film has a thickness of 6 μm to 12. Mu.m.
Further, the thickness of the HB358QF layer is 6 μm-12 μm.
The preparation method of the composite adhesive tape for protecting the lithium ion battery tab comprises the following steps:
step one: unreeling the PET film;
step two: preheating PP particles and HB358 QF;
step three: extruding the bilayer polymer melt from the die head in an extruder and coating the bilayer polymer melt on the PET substrate according to a preset thickness;
step four: the cooling roller is rolled up and the adhesive tape is attached;
step five: the cutting device cuts according to the size specified by the user.
In the invention, the PP plastic film is a polypropylene material, and HB358QF polyolefin insulating high polymer material. The thickness of the PP film is 6 mu m, the thickness of the HB358QF layer is 6 mu m, and in the actual manufacturing of the adhesive tape, the thickness of the two layers of materials can be changed according to the actual requirements according to the different thickness of the coating of the lithium battery pole piece, and the single-layer thickness is in the range of 6 mu m-12 mu m.
In the invention, the PP plastic film has ultrahigh insulativity (230-250 kV/cm) and extremely strong chemical stability, but the PP plastic film is a surface inert substance with poor bonding strength, especially on a smooth metal surface. The HB358QF polyolefin insulating polymer material solves the problem of bonding strength under the environment of electrolyte soaking. As shown in FIG. 2, the adhesive strength of the HB358QF layer in the present invention is schematically represented. HB358QF is used for the adhesive strength schematic of aluminum, adhesive strength (N/15 mm).
The HB358QF layer comprises the following components in percentage by mass: 30% -60% of HC318BF material and 40% -70% of PP119HC material.
HC318BF material is a PP main material, and ensures fusion of HB358QF and a PP film and adhesion strength of PP. PP119HC is a modified high molecular polymer, and the material has the function of bonding strength with metal under the condition of 160-180 degrees of material melting.
When the lithium battery positive electrode is used, the composite adhesive tape is firstly heated to 160-180 ℃ to enable HB358QF materials to be hot melted, and then pressure is applied to enable HB358QF materials in the melted state to adhere the PP film to an aluminum foil interface (lithium battery positive electrode). The finally formed PP film protective layer has the characteristics of ultrahigh pressure resistance, electrolyte corrosion resistance and high bonding strength.
In the invention, the HB358QF laminates have the following properties:
| project | Evaluation method | Unit (B) | HB358QF |
| MFR(230℃) | ASTM1238 | G/10min | 5.2 |
| Density of | D1505 | G/cm2 | 960 |
| Tension at yield point | D638 | MPA | 15.7 |
| Tensile breaking strength | D638 | MPA | 19 |
| Elongation at tensile break | D638 | ％ | >500 |
| Izod impact Strength | J/M | 500 | |
| Pitch softening point | D1525 | ℃ | 112 |
| Hardness of the pin type | D2240 | D-scale | 58 |
| Adhesive strength | 5M/min | N/15MM | 17 |
| 20M/min | N/15MM | 4.1 |
In the invention, no similar technology exists in the lithium battery industry at present. The composite adhesive tape is manufactured by one-step forming by using a tape casting and film coating method, and the adopted equipment is a tape casting and film coating machine. The film coating is also called extrusion coating, which is a process of casting and coating a molten resin material on a substrate, and rapidly pressing, cooling and forming. In the manufacturing scheme of the adhesive tape, 15 mu m PET (polyethylene terephthalate) material is adopted as a coating base material, PP (polypropylene) particles and HB358QF particles are coated in a double-layer manner on a tape casting film coating machine, the first layer is PP, the second layer is HB358QF, and the base material is PET film. The thickness of the bilayer coating can be directly controlled using a coater.
The manufacturing process of the adhesive tape of the invention is as follows:
step one: unreeling the PET film;
step two: preheating PP particles and HB358 QF;
step three: the bilayer polymer melt is extruded from the die in an extruder and coated on the PET substrate according to a preset thickness (as desired;
step four: the cooling roller is rolled up and the adhesive tape is attached;
step five: the cutting device cuts according to the size specified by the user.
The composite tape of the invention is a prefabricated product that can be formed into a final form in a manufacturer's shop without being prepared in situ in a cell production shop. The ceramic slurry can be directly attached and used for replacing the ceramic slurry in the production of the lithium battery pole piece. Compared with the existing ceramic slurry coating, the coating has obvious advantages, and is described as follows:
(1) The use is simple. The compound adhesive tape can be directly attached to the pole piece through a simple hot pressing device, and the pole lug is protected.
(2) The material cost is low. The material cost is reduced by about 50% compared with the prior ceramic slurry.
(3) The non-material cost is reduced: comprises equipment, a field and a material conveying pipeline for saving the stirring process. And the ceramic slurry coating is canceled, so that the consumption of a coating head is saved.
(4) The consistency is good. The consistency of the adhesive tape is far better than that of ceramic slurry coating, the tab protection is more sufficient, and the safety of the battery cell is higher.
(5) And the risk of a supply chain is controlled, and raw materials such as PVDF and the like cannot be increased in price or supplied in a broken way. The raw materials of the compound adhesive tape scheme are easy to obtain, and stable and large-scale supply can be ensured.
(6) And the purchase management is convenient. Only one supplier needs to be docked, and a plurality of material numbers can be supplied according to different thickness requirements. If the thickness is not a critical parameter, it is only one material number. (ceramic slurry should be at least docked to boehmite, PVDF and NMP suppliers).
The invention has the following advantages:
(1) The electrical insulation is good. The withstand voltage reaches 3600V.
(2) The stability is excellent, and the electrolyte corrosion resistance is realized.
(3) The bonding strength is high. The adhesive strength with aluminum material (aluminum foil) is high, and the strength still meets the strength requirement under the electrolyte corrosion condition.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the features and concepts described herein are therefore intended to be embraced therein.
Claims (6)
1. The composite adhesive tape for protecting the tab of the lithium ion battery comprises a composite adhesive tape body, wherein the composite adhesive tape body comprises a composite film layer arranged on a PET film;
the method is characterized in that: the composite film layer comprises a PP film and an HB358QF layer; and a PP film is arranged on the HB358QF layer.
2. The composite adhesive tape for protecting tabs of lithium ion batteries according to claim 1, wherein the composite adhesive tape is characterized in that: the HB358QF layer comprises the following components in percentage by mass:
30% -60% of HC318BF material and 40% -70% of PP119HC material.
3. The composite adhesive tape for protecting tabs of lithium ion batteries according to claim 1, wherein the composite adhesive tape is characterized in that: the PP film is made of plastic films, and the HB358QF layer is made of polyolefin insulating high polymer.
4. The composite adhesive tape for protecting tabs of lithium ion batteries according to claim 1, wherein the composite adhesive tape is characterized in that: the thickness of the PP film is 6-12 mu m.
5. The composite adhesive tape for protecting tabs of lithium ion batteries according to claim 1, wherein the composite adhesive tape is characterized in that: the thickness of the HB358QF layer is 6 μm-12 μm.
6. The preparation method of the composite adhesive tape for protecting the lithium ion battery tab comprises the following steps:
step one: unreeling the PET film;
step two: preheating PP particles and HB358 QF;
step three: extruding the bilayer polymer melt from the die head in an extruder and coating the bilayer polymer melt on the PET substrate according to a preset thickness;
step four: the cooling roller is rolled up and the adhesive tape is attached;
step five: the cutting device cuts according to the size specified by the user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211172539.6A CN117801695A (en) | 2022-09-26 | 2022-09-26 | Composite adhesive tape for protecting lithium ion battery tab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211172539.6A CN117801695A (en) | 2022-09-26 | 2022-09-26 | Composite adhesive tape for protecting lithium ion battery tab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117801695A true CN117801695A (en) | 2024-04-02 |
Family
ID=90427328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211172539.6A Pending CN117801695A (en) | 2022-09-26 | 2022-09-26 | Composite adhesive tape for protecting lithium ion battery tab |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117801695A (en) |
-
2022
- 2022-09-26 CN CN202211172539.6A patent/CN117801695A/en active Pending
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