CN111312937A - Aluminum-plastic film, manufacturing method thereof and battery using aluminum-plastic film - Google Patents
Aluminum-plastic film, manufacturing method thereof and battery using aluminum-plastic film Download PDFInfo
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- CN111312937A CN111312937A CN202010133864.6A CN202010133864A CN111312937A CN 111312937 A CN111312937 A CN 111312937A CN 202010133864 A CN202010133864 A CN 202010133864A CN 111312937 A CN111312937 A CN 111312937A
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- Prior art keywords
- layer
- aluminum
- plastic film
- adhesive
- adhesive layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
- 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
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention relates to an aluminum plastic film, a method for producing the same, and a battery using the same. The aluminum-plastic film comprises an outer layer, an aluminum layer and an inner layer, wherein the size of the aluminum layer is smaller than that of the outer layer and that of the inner layer, so that the aluminum layer is not exposed outside at the edge of the aluminum-plastic film. Accordingly, in the soft package battery made of the aluminum-plastic film, the possibility that aluminum is communicated with the anode through the electrolyte is eliminated, and the corresponding corrosion does not occur.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to an aluminum-plastic film, a manufacturing method thereof and a battery using the aluminum-plastic film.
Background
The soft package battery has the advantages of good safety, light weight, large capacity and the like, so that the soft package battery is widely applied to high-voltage batteries of new energy vehicles at present. Generally, the outer layer of the laminate battery is an Aluminum Plastic Film (ALF), which has three main laminated layers of polyester/nylon, Aluminum and polypropylene (PP) from outside to inside, and the layers are bonded together by an adhesive.
As technology advances, the layers of aluminum plastic film are becoming more and more patterned. For example, chinese patent application CN 110065283a discloses an aluminum-plastic composite film, which has an outer sealing layer, an adhesive resin layer and an inner sealing layer, wherein the outer sealing layer can be 1-2 nylon layers or 1-2 polyester layers, and the inner sealing layer can be 2-3 PP layers. For another example, chinese patent application CN 110103533A discloses an aluminum plastic film comprising an outer layer of a cross-linked plastic film, a layer of a passivated aluminum foil and an inner layer of a cross-linked plastic film.
Fig. 1 illustrates a method of manufacturing a conventional aluminum plastic film battery. After the layers are positioned, the layers of the aluminum plastic film are shaped by calendering, as shown in fig. 1. As can be seen in fig. 1, the aluminum layer is exposed at the edges of the aluminum plastic film after calendering.
Further, as shown in fig. 2, whatever form of the aluminum plastic film is used, undesirable contact of the aluminum layer with an external conductive medium (e.g., electrolyte) at the edges of the aluminum plastic film will cause corrosion of the cell due to the manufacturing process. That is, the aluminum layer contacts the electrolyte from outside the cell, forming a loop, for example, at the left side of the cell pouch in fig. 1.
Specifically, in fig. 2, the closed path on the left is bridged by some conductive solvent (e.g., electrolyte). With internal ion channels between the aluminum and the electrolyte formed by cracks in the polypropylene layer, a complete electrical circuit is formed and corrosion occurs. The aluminum ions will react with the lithium ions in the anode to form some alloy, which will further consume the aluminum and carry a risk of more external water entering the cell. Meanwhile, the volume of the reaction area can be changed, the layers of the aluminum plastic film are mutually separated, and a dark area can be seen from the appearance of the soft bag.
From the above, the electrolyte present around the edges of the anode and the aluminium-plastic film will act as a bridge, which will lead to corrosion. The presence of various conductive media in this area, in addition to the electrolyte, can lead to some degree of corrosion.
To prevent this corrosion, gummed paper or other spacers may be attached to the sides of the cell for protection. However, this approach results in an increase in the overall size and weight of the battery and an increase in cost.
For this reason, chinese patent application CN 205911328U discloses a polymer battery, which is manufactured by folding back the edge of an aluminum-plastic film to form a folded edge, so that the aluminum layer is not exposed, thereby avoiding corrosion and eliminating the need for a protective layer. However, the solution in this patent application leads to an increase in the thickness and weight of the battery, a waste of materials, and an increase in the process flow, and thus there is still room for further improvement.
Disclosure of Invention
In order to solve the technical problems, the invention provides the following technical scheme:
the present invention provides an improved aluminum layer.
An aluminum-plastic film comprises an outer layer, an aluminum layer and an inner layer, wherein the size of the aluminum layer is smaller than that of the outer layer and that of the inner layer, so that the aluminum layer is not exposed outside at the edge of the aluminum-plastic film.
According to one aspect of the invention, an adhesive layer is included between the outer layer and the aluminum layer, and between the aluminum layer and the inner layer.
According to one aspect of the invention, the aluminium layer has a reduced length of 5-10mm at the edges of the aluminium-plastic film compared to the other layers.
According to one aspect of the invention, the outer layer is a nylon layer and the inner layer is a polypropylene layer.
According to one aspect of the invention, the outer layers are arranged in a stack and have a number of layers of 1-3, and the inner layers are arranged in a stack and have a number of layers of 1-3.
According to one aspect of the invention, both the outer layer and the inner layer are cross-linked plastic films.
In addition, the invention also provides a battery, which comprises a cathode, an anode, electrolyte and the aluminum plastic film according to the scheme.
In addition, the invention also provides a method for manufacturing the aluminum-plastic film, which comprises the following steps:
stacking an outer layer, a first adhesive layer, an aluminum layer, a second adhesive layer, and an inner layer in this order, wherein the aluminum layer has a size smaller than that of the outer layer, the inner layer, and at least one of the first adhesive layer and the second adhesive layer, such that an edge of the aluminum layer is recessed inward compared to the outer layer, the inner layer, and at least one of the first adhesive layer and the second adhesive layer after stacking;
forming the outer layer, the first adhesive layer, the aluminum layer, the second adhesive layer, and the inner layer, which are stacked, by a calendering process such that an edge of the aluminum layer is covered by at least one of the first adhesive layer and the second adhesive layer without being exposed to the outside.
According to an aspect of the present invention, an outer layer, a first adhesive layer, an aluminum layer, a second adhesive layer, and an inner layer are sequentially stacked such that an edge of the aluminum layer is recessed by 5-10mm from an edge of at least one of the outer layer, the inner layer, and the first and second adhesive layers.
According to one aspect of the invention, 1-3 layers of an outer layer material are stacked to form the outer layer, and 1-3 layers of an inner layer material are stacked to form the inner layer, wherein the outer layer material is nylon and the inner layer material is polypropylene. As can be seen from the above, in the aluminum plastic film of the present invention, the edges of the aluminum layer are sealed by the adjacent adhesive layers, and therefore, in the battery using the aluminum plastic film of the present invention, the aluminum layer is covered by the adhesive layer so as to avoid contact with the electrolyte.
Therefore, the invention has the following technical effects:
the possibility of corrosion of the soft package battery caused by the conductive connection of the anode and the aluminum layer is eliminated; and the weight and the cost are reduced.
Drawings
Fig. 1 shows a prior art method for forming an aluminum plastic film.
Fig. 2 shows a schematic diagram of corrosion of a prior art aluminum plastic film battery.
Fig. 3 shows a structure of an aluminum plastic film according to the present invention.
Fig. 4 shows an embodiment of a forming step in the method for manufacturing an aluminum plastic film according to the present invention.
Fig. 5 shows a schematic diagram of a battery manufactured according to an embodiment of the method for manufacturing an aluminum plastic film of the present invention to prevent corrosion.
The drawings are only schematic and show only those parts which are necessary in order to clarify the invention, other parts being omitted or merely mentioned. That is, the present invention may include other components in addition to those shown in the drawings.
Detailed Description
The following describes the technical solution of the present invention in detail with reference to fig. 3, 4 and 5.
As an illustrative example, as shown in fig. 3, the aluminum plastic film of the present invention includes an outer layer 1, a first adhesive layer 2, an aluminum layer 3, a second adhesive layer 4, and an inner layer 5. The outer layer 1 may be a nylon layer and the inner layer 5 may be a polypropylene layer. The outer layer 1 and the inner layer 5 may both be cross-linked plastic films. When in use, the outer layer 1 can be used as the outer side of the battery pack, and the poly inner layer 5 can be used as the inner side of the battery pack. The materials of the first adhesive layer 2 and the second adhesive layer 4 may be the same or different. As can be seen from the figure, the size of the aluminum layer 3 is smaller than that of the outer layer 1 and the inner layer 5, and the aluminum layer 3 may be wrapped by the first adhesive layer 2 and/or the second adhesive layer 4, so that the aluminum layer 3 is not exposed to the outside at the edge of the aluminum plastic film. At the edges of the aluminium-plastic film the aluminium layer 3 can be shortened by 5-10mm compared to the other layers.
As an illustrative example, as shown in fig. 4, before the aluminum-plastic film material is subjected to calender molding, a nylon layer, an adhesive layer, an aluminum layer, an adhesive layer, and a polypropylene layer are prepared, which are sequentially stacked. Also, as an improvement of the present invention over the prior art, it can be seen from fig. 3 that at the edges the aluminum layer is more inward than the other layers. That is, the size of the aluminum layer is smaller than the size of the other layers.
Subsequently, the material obtained by stacking the above layers is rolled. Since the aluminum layer is more inward at the edges in the raw material, after calendering, the aluminum layer is completely covered by the adjacent adhesive layer and thus is not exposed to the outside.
Obviously, the present invention can also adopt any feasible layer structure form in the prior art, such as a nylon layer is set to be more than one layer, and a polypropylene layer is set to be more than multiple layers. Alternatively, both the outer and inner layers may be provided as cross-linked plastic films.
Further, as a preferred embodiment, when considering the size of the inward contraction of the aluminum layer, the position of the sealing region around the anode, the sealability of the non-aluminum region, the design size of the battery, and the like are considered, thereby obtaining an optimal contraction size.
As an exemplary sizing, the foreshortening dimension is set to 5-10 mm. Of course, the value may be set to other values as desired, for example, 5-20 mm. Or the value may be set to a value related to the overall dimension, for example, to be in the range of 0.1% -1% of the length or width of the aluminum plastic film.
As can be seen from fig. 5, when the aluminum plastic film obtained according to the method shown in fig. 4 is used for a pouch of a battery, since the aluminum layer is completely covered with the adhesive layer at the edges and is not exposed to the outside, the aluminum cannot be connected to the anode through the electrolyte. In this case, even if there is still a crack in the polypropylene layer and an ion channel exists, a circuit cannot be formed. Eventually, the possibility of the aluminum communicating with the anode through the electrolyte is eliminated.
The foregoing description of the embodiments of the invention has been presented for purposes of illustration and description. Of course, what has been described above is merely exemplary of embodiments that are relevant to the spirit and principles of the invention. It will be appreciated by those skilled in the art that changes may be made in the described examples without departing from the principles and spirit thereof, and that such changes are contemplated by the inventors and are within the scope of the invention as defined in the appended claims.
Claims (10)
1. An aluminium-plastic film comprising an outer layer, an aluminium layer and an inner layer, characterised in that the aluminium layer is smaller in size than the outer layer and the inner layer so that the aluminium layer is not exposed at the edges of the aluminium-plastic film.
2. The aluminum-plastic film of claim 1, comprising an adhesive layer between the outer layer and the aluminum layer, and between the aluminum layer and the inner layer.
3. The aluminum-plastic film of claim 2, wherein the aluminum layer is shortened by 5-10mm from the other layers at the edges of the aluminum-plastic film.
4. The aluminum-plastic composite film of any of claims 1-3, wherein the outer layer is a nylon layer and the inner layer is a polypropylene layer.
5. The aluminum-plastic composite film of claim 4, wherein the outer layer is in a laminated arrangement and has a number of layers of 1-3, and the inner layer is in a laminated arrangement and has a number of layers of 1-3.
6. Aluminium-plastic film according to any one of claims 1 to 3, characterized in that both the outer layer and the inner layer are cross-linked plastic films.
7. A battery comprising a cathode, an anode, an electrolyte, and the aluminum-plastic film of any of claims 1-6.
8. A method of making an aluminum-plastic film, comprising the steps of:
stacking an outer layer, a first adhesive layer, an aluminum layer, a second adhesive layer, and an inner layer in this order, wherein the aluminum layer has a size smaller than that of the outer layer, the inner layer, and at least one of the first adhesive layer and the second adhesive layer, such that an edge of the aluminum layer is recessed inward compared to the outer layer, the inner layer, and at least one of the first adhesive layer and the second adhesive layer after stacking;
forming the outer layer, the first adhesive layer, the aluminum layer, the second adhesive layer, and the inner layer, which are stacked, by a calendering process such that an edge of the aluminum layer is covered by at least one of the first adhesive layer and the second adhesive layer without being exposed to the outside.
9. The method of claim 8, wherein an outer layer, a first adhesive layer, an aluminum layer, a second adhesive layer, and an inner layer are sequentially stacked such that an edge of the aluminum layer is recessed by 5-10mm from an edge of at least one of the outer layer, the inner layer, and the first adhesive layer and the second adhesive layer.
10. The method of claim 8 or 9, further comprising stacking 1-3 layers of outer layer material to form the outer layer and 1-3 layers of inner layer material to form the inner layer, wherein the outer layer material is nylon and the inner layer material is polypropylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133864.6A CN111312937A (en) | 2020-02-28 | 2020-02-28 | Aluminum-plastic film, manufacturing method thereof and battery using aluminum-plastic film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133864.6A CN111312937A (en) | 2020-02-28 | 2020-02-28 | Aluminum-plastic film, manufacturing method thereof and battery using aluminum-plastic film |
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| Publication Number | Publication Date |
|---|---|
| CN111312937A true CN111312937A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010133864.6A Pending CN111312937A (en) | 2020-02-28 | 2020-02-28 | Aluminum-plastic film, manufacturing method thereof and battery using aluminum-plastic film |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542639A (en) * | 2020-12-08 | 2021-03-23 | 珠海冠宇电池股份有限公司 | Soft package battery and preparation method thereof |
| CN112599894A (en) * | 2020-12-11 | 2021-04-02 | 珠海冠宇电池股份有限公司 | Soft package battery and preparation method thereof |
| WO2022198612A1 (en) * | 2021-03-26 | 2022-09-29 | 东莞新能安科技有限公司 | Battery, electric device and unmanned aerial vehicle |
-
2020
- 2020-02-28 CN CN202010133864.6A patent/CN111312937A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542639A (en) * | 2020-12-08 | 2021-03-23 | 珠海冠宇电池股份有限公司 | Soft package battery and preparation method thereof |
| CN112542639B (en) * | 2020-12-08 | 2023-07-18 | 珠海冠宇电池股份有限公司 | Soft package battery and preparation method thereof |
| CN112599894A (en) * | 2020-12-11 | 2021-04-02 | 珠海冠宇电池股份有限公司 | Soft package battery and preparation method thereof |
| WO2022198612A1 (en) * | 2021-03-26 | 2022-09-29 | 东莞新能安科技有限公司 | Battery, electric device and unmanned aerial vehicle |
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Application publication date: 20200619 |