CN216980703U - Improve protection film and laminate polymer battery of laminate polymer battery surface fold - Google Patents
Improve protection film and laminate polymer battery of laminate polymer battery surface fold Download PDFInfo
- Publication number
- CN216980703U CN216980703U CN202220561581.6U CN202220561581U CN216980703U CN 216980703 U CN216980703 U CN 216980703U CN 202220561581 U CN202220561581 U CN 202220561581U CN 216980703 U CN216980703 U CN 216980703U
- Authority
- CN
- China
- Prior art keywords
- protective film
- soft package
- film
- package battery
- aluminum
- 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.)
- Active
Links
Images
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model provides a protective film for improving surface wrinkles of a soft package battery and the soft package battery. The utility model reduces the contact area between the protective film and the aluminum-plastic film of the soft package battery by arranging the reticulate pattern on the surface of one side of the protective film, is beneficial to improving the wrinkle phenomenon caused by the fact that gas cannot be discharged during film pasting, and can also prevent the aluminum-plastic film from deforming due to the thermal stress caused by baking and the inconsistent thermal shrinkage of the protective film and the aluminum-plastic film in the high-temperature baking process, thereby thoroughly solving the wrinkle problem of the aluminum-plastic film.
Description
Technical Field
The utility model relates to the field of protective films, in particular to a protective film for improving surface wrinkles of a soft package battery and the soft package battery.
Background
Due to the unique packaging material and structure, the soft package lithium ion battery has a series of advantages, such as: (1) the soft package battery is structurally packaged by an aluminum plastic film, so that when safety problems occur, the soft package battery generally expands air and cracks, and the explosion of the soft package battery is not caused like a steel shell or aluminum shell battery cell; (2) the weight of the soft package battery is 40% lighter than that of a steel shell lithium ion battery with the same capacity, and is 20% lighter than that of an aluminum shell lithium ion battery; (3) the internal resistance is small, the internal resistance of the soft package battery is smaller than that of the lithium ion battery, and the self power consumption of the battery can be greatly reduced; (4) the cycle performance is good, the cycle life of the soft package battery is longer, and the cycle attenuation of 100 times is 4-7% less than that of an aluminum shell; (5) the design is flexible, the appearance can be changed into any shape, the thickness can be thinner, and the novel battery cell model can be developed according to the customization of the requirements of customers.
At present, soft package lithium ion batteries are widely used in the fields of 3C digital products, power and energy storage markets. The soft package lithium battery is composed of a positive electrode material, a negative electrode material, a diaphragm, electrolyte and a key aluminum plastic film (nylon-aluminum layer-polypropylene) coated on the outermost layer. The soft package battery is packaged and formed by using the aluminum plastic film, and has the advantages of light weight, high battery energy density, multiple shapes, easy size adjustment, excellent circulation and the like, but the outermost nylon layer of the aluminum plastic film has the problems of easy scratching by a machine, damage and leakage, corrosion by electrolyte and the like in the battery manufacturing process, so that the PET protective film is generally pasted on the outermost layer of the aluminum plastic film after the top side of the soft package battery is packaged in a top side sealing manner, the surface of the battery core is protected from being damaged, and the problems are solved. Considering the high temperature resistance of the PET protective film in vacuum baking at 90 ℃ of the battery and the adhesion degree of nylon at the outermost layer of the aluminum plastic film, and the difficulty of separation and cost problems in the subsequent battery pack, a nearly universal protective film is a high temperature resistant polyester film (PET protective film) because of its excellent physical properties, chemical properties, dimensional stability, transparency, and recyclability.
Mylar, while having an excellent balance of properties, also has some considerable problems. The battery manufacturing process mainly comprises the following steps: preparing positive and negative electrodes, coating the positive and negative electrodes, preparing a bare cell, putting the bare cell into a shell, packaging for one time, pasting a film, baking, injecting liquid, forming, placing at high temperature, packaging for secondary forming, grading, performing final inspection and the like, wherein the battery often generates bubbles, wrinkles and other phenomena in the film pasting process, and the abnormal battery without wrinkles and wrinkles in appearance is mainly selected in the final inspection; however, when the soft package battery uses a general PET protective film in the industry, the surface of the battery is found to generate slight 'wrinkles' or serious 'rib' type abnormity in final inspection, so that the phenomenon of structural deformation is caused, a large number of appearance defective products and scrapped products are generated, and the phenomenon is more serious when the area of the soft package battery is larger, so that a series of problems are brought to the production of the soft package battery.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, the utility model aims to provide a protective film for improving surface wrinkles of a pouch battery and the pouch battery. The utility model reduces the contact area between the protective film and the aluminum-plastic film of the soft package battery by arranging the reticulate pattern on the surface of one side of the protective film, is beneficial to improving the wrinkle phenomenon caused by the fact that gas cannot be discharged during film pasting, and can also prevent the aluminum-plastic film from deforming due to the thermal stress caused by baking and the inconsistent thermal shrinkage of the protective film and the aluminum-plastic film in the high-temperature baking process, thereby thoroughly solving the wrinkle problem of the aluminum-plastic film.
In order to achieve the purpose, the utility model adopts the following technical scheme:
in a first aspect, the utility model provides a protective film for improving surface wrinkles of a soft package battery, wherein an integrated reticulate pattern is arranged on the surface of one side, close to an aluminum plastic film of the soft package battery, of the protective film.
In the utility model, "integrated" means that the reticulate pattern is arranged on the body of the protective film and is formed by compounding a non-multilayer structure; for example, the protective film material may be directly pressed to form a texture on the surface of the protective film, or a texture may be pressed to form a texture on a flat protective film.
The general soft package lithium cell PET protection film among the prior art is scribbled one deck Acrylic glue on PET (polyester film) light membrane, become soft package lithium cell PET protection film through cutting after the rolling shaping, it has pad pasting bubble, fold etc. unusually at the pad pasting in-process, especially soft package battery is when examining finally, can lead to the structure deformation phenomenon because the shrink etc. causes the battery surface slight "fold" or serious "rib" type unusually after toasting, produce a large amount of outward appearance defective products and scrap article, especially when producing big area size soft package battery, this bad proportion is higher.
The structure of the protective film is slightly processed, namely the reticulate pattern is arranged on the surface of one side of the protective film, so that the contact area between the protective film and the aluminum-plastic film of the soft package battery is reduced, the reticulate pattern can play a role of an air circuit, the wrinkle phenomenon caused by the fact that gas cannot be discharged during film pasting can be improved, the aluminum-plastic film is prevented from deforming due to the fact that thermal shrinkage of the protective film and the aluminum-plastic film is inconsistent and thermal stress caused by baking is avoided in the high-temperature baking process, the problem of wrinkling of the aluminum-plastic film is solved thoroughly, and defective appearance products and waste reports are reduced. Meanwhile, the reticulate pattern is arranged on the protective film body, an additional reticulate pattern layer is not required to be added, material waste is reduced, poor combination effect among multiple layers of materials is prevented, and integral forming efficiency is higher.
In a preferred embodiment of the present invention, the thickness of the protective film is 0.3 to 0.6mm, and may be, for example, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.6mm, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
The utility model preferably selects a proper protective film thickness, is beneficial to setting the reticulate pattern, is matched with the structure of the utility model, and can improve the comprehensive performance of the soft package battery obtained by subsequent preparation.
In a preferred embodiment of the present invention, the depth of the texture is 0.1 to 0.3mm, and may be, for example, 0.1mm, 0.15mm, 0.2mm, 0.25mm, or 0.3mm, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
The utility model adopts proper reticulate pattern depth to match with the protective film, and has better anti-wrinkle effect.
In a preferred embodiment of the present invention, the area of the texture may be 30 to 80% of the total area of the protective film, and may be, for example, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or 80%, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable. The problem of deformation and wrinkling of the aluminum-plastic film is further solved by optimizing the occupied area of the reticulate pattern.
As a preferable embodiment of the present invention, the texture is uniformly distributed on the surface of the protective film.
It should be noted that the specific shape of the texture is not limited in the present invention, and for example, the texture may be a square structure, a diamond structure, a trapezoid structure, or a circular structure formed by criss-cross arrangement of the textures, and the texture may be uniformly distributed.
As a preferable technical scheme of the utility model, the surface of the protective film on the side far away from the aluminum plastic film of the soft package battery is in a plane structure.
In a preferred embodiment of the present invention, the protective film is a PET film, and the PET protective film in the present invention is a material known to those skilled in the art.
In a second aspect, the utility model provides a soft package battery, wherein the surface of an aluminum plastic film of the soft package battery is provided with the protective film for improving the surface wrinkles of the soft package battery.
The soft package battery prepared by the protective film has no wrinkles on the surface and better appearance and appearance, and is suitable for industrial production.
It should be noted that the utility model does not limit the electric core of the soft package battery, and any soft package system battery which is wrapped with the aluminum-plastic film in the prior art can be used.
The preparation method of the soft package battery is not particularly limited, and exemplarily, after the cell of the soft package battery is placed in the shell and a primary packaging process is completed, the reticulate protective films are respectively and centrally attached to the main bodies on the front side and the back side of the soft package battery after the primary packaging, and the positions of the air bags are reserved, so that the soft package battery with the attached films is obtained.
As a preferable technical solution of the present invention, a glue layer is disposed between the aluminum plastic film and the protective film.
As a preferred technical solution of the present invention, an area of the aluminum-plastic film for encapsulating the battery cell is an encapsulation area, an area of the aluminum-plastic film reserved with the air bag is an air bag area, and the protective film is disposed on a surface of the encapsulation area.
In the present invention, it is preferable that the protective film is attached to a position without the airbag, and the airbag is separated after the completion of the formation of the battery.
Exemplarily, a preparation method of the protective film for improving the surface wrinkle of the pouch battery comprises the following steps:
the protective film is prepared by taking polyethylene glycol terephthalate as a raw material, preparing a sheet film by adopting an extrusion method, then obtaining a film by a stretching method, and rolling one surface of the film by adopting a roller with reticulate patterns to obtain the protective film for improving the surface wrinkles of the soft package battery.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model reduces the contact area between the protective film and the aluminum-plastic film of the soft package battery by arranging the reticulate pattern on the surface of one side of the protective film, is beneficial to improving the wrinkle phenomenon caused by the fact that gas cannot be discharged during film pasting, and can also prevent the aluminum-plastic film from deforming due to the thermal stress caused by baking and the inconsistent thermal shrinkage of the protective film and the aluminum-plastic film in the high-temperature baking process, thereby thoroughly solving the wrinkle problem of the aluminum-plastic film.
Drawings
Fig. 1 is a schematic structural diagram of a protective film for improving surface wrinkles of a pouch battery provided in an embodiment of the present invention.
In the figure: 1-protective film; 2-reticulate pattern.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
In one embodiment, the utility model provides a protective film 1 for improving the surface wrinkles of a soft package battery, and as shown in fig. 1, the protective film 1 is provided with an integrated reticulate pattern 2 on the surface of one side close to an aluminum plastic film of the soft package battery.
Further, the thickness of the protective film 1 is 0.3-0.6 mm.
Furthermore, the depth of the reticulate pattern 2 is 0.1-0.3 mm.
Further, the area of the reticulate pattern 2 accounts for 30-80% of the total area of the protective film 1.
Further, the reticulate patterns 2 are uniformly distributed on the surface of the protective film 1.
Further, the protection film 1 is in a plane structure on the surface of one side far away from the soft package battery aluminum-plastic film.
Further, the protective film 1 is a PET film.
In a specific embodiment, the utility model also provides a soft package battery, wherein the surface of the aluminum plastic film of the soft package battery is provided with the protective film 1 for improving the surface wrinkles of the soft package battery.
Further, a glue layer is arranged between the aluminum plastic film and the protective film 1.
Further, the area of the aluminum-plastic film for packaging the battery cell is a packaging area, the area of the aluminum-plastic film reserved with the air bag is an air bag area, and the protective film 1 is arranged on the surface of the packaging area.
To better illustrate the utility model and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the utility model are as follows:
example 1
The utility model provides a protective film 1 for improving wrinkles on the surface of a soft package battery, as shown in fig. 1, reticulate patterns 2 which are uniformly distributed are arranged on the surface of one side, close to an aluminum-plastic film of the soft package battery, of the protective film 1, the reticulate patterns 2 are distributed on the surface of the protective film 1 in a criss-cross mode, and the surface of the other side of the protective film 1 is a plane;
the thickness of protection film 1 is 0.5mm, the degree of depth of reticulation 2 is 0.1mm, and the area of reticulation 2 accounts for 50% of protection film 1 total area, and protection film 1 is the PET membrane.
Example 2
The same as example 1 was repeated except that the thickness of the protective film 1 was 0.2 mm.
Example 3
The same as example 1 was repeated except that the thickness of the protective film 1 was 0.7 mm.
Comparative example 1
The same procedure as in example 1 was repeated except that the mesh 2 was not provided.
The protective films 1 of the examples 1-3 and the comparative example 1 are glued and pasted outside the aluminum plastic film of the soft package battery, a baking test is carried out, and the wrinkling condition of the surface of the soft package battery is observed.
TABLE 1
| Wrinkling condition | |
| Example 1 | Without wrinkles |
| Example 2 | Micro-folds |
| Example 3 | Micro-folds |
| Comparative example 1 | Severe wrinkles |
According to the utility model, the reticulate pattern 2 is arranged on the surface of one side of the protective film 1, so that the contact area between the protective film 1 and the aluminum-plastic film of the soft package battery is reduced, the wrinkle phenomenon caused by the fact that gas cannot be discharged during film pasting is favorably improved, the phenomenon that the aluminum-plastic film deforms due to the fact that the thermal shrinkage of the protective film 1 and the aluminum-plastic film is inconsistent and thermal stress caused by baking is prevented in the high-temperature baking process, and the problem of wrinkle of the aluminum-plastic film is thoroughly solved.
As can be seen from the comparison between the above example 1 and examples 2 to 3 and the comparison example 1, the protective film 1 of the present invention has the texture 2 on one side to prevent wrinkles from occurring, and the protective film 1 of a specific thickness can further prevent wrinkles from occurring by matching the texture 2 with the protective film 1, so that the appearance of the protective film is the best in the example 1 and no wrinkles are generated.
The present invention is described in detail with reference to the above embodiments, but the present invention is not limited to the above detailed structural features, that is, the present invention is not meant to be implemented only by relying on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The utility model provides an improve protection film of laminate polymer battery surface fold which characterized in that, the protection film is provided with the reticulation of integration on a side surface that is close to laminate polymer battery plastic-aluminum membrane.
2. The protective film for improving the surface wrinkles of the soft package battery according to claim 1, wherein the thickness of the protective film is 0.3-0.6 mm.
3. The protective film for improving the surface wrinkles of the soft package battery according to claim 1, wherein the depth of the reticulate pattern is 0.1-0.3 mm.
4. The protective film for improving the surface wrinkles of the soft package battery according to claim 1, wherein the area of the reticulate pattern accounts for 30-80% of the total area of the protective film.
5. The protective film for improving the surface wrinkles of the soft package battery according to claim 1, wherein the reticulate patterns are uniformly distributed on the surface of the protective film.
6. The protective film for improving the surface wrinkles of the soft package battery according to claim 1, wherein the surface of the protective film on the side far away from the aluminum plastic film of the soft package battery is in a planar structure.
7. The protective film for improving the surface wrinkles of the soft package battery according to claim 1, is a PET film.
8. A soft package battery is characterized in that the surface of an aluminum plastic film of the soft package battery is provided with the protective film for improving surface wrinkles of the soft package battery according to any one of claims 1 to 7.
9. The laminate battery as claimed in claim 8, wherein a glue layer is disposed between the aluminum plastic film and the protective film.
10. The soft package battery according to claim 8, wherein the area of the aluminum-plastic film for packaging the battery cell is a packaging area, the area of the aluminum-plastic film reserved with the air bag is an air bag area, and the protective film is arranged on the surface of the packaging area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220561581.6U CN216980703U (en) | 2022-03-15 | 2022-03-15 | Improve protection film and laminate polymer battery of laminate polymer battery surface fold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220561581.6U CN216980703U (en) | 2022-03-15 | 2022-03-15 | Improve protection film and laminate polymer battery of laminate polymer battery surface fold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216980703U true CN216980703U (en) | 2022-07-15 |
Family
ID=82360645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220561581.6U Active CN216980703U (en) | 2022-03-15 | 2022-03-15 | Improve protection film and laminate polymer battery of laminate polymer battery surface fold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216980703U (en) |
-
2022
- 2022-03-15 CN CN202220561581.6U patent/CN216980703U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6644373B2 (en) | Stair structure battery cell | |
| EP4102528A1 (en) | Energy storage device and method for manufacturing energy storage device | |
| WO2021244410A1 (en) | Soft-pack lithium ion battery cell and preparation method therefor | |
| KR101168650B1 (en) | Pocketed electrode plate, electrode assembly and lithium secondary battery using thereof | |
| KR20190042800A (en) | Pouch-Type Battery Case Having Structure to Prevent Crack and Method for Preparing the Same | |
| KR101623106B1 (en) | Formimg apparatus for pouch film | |
| CN210866397U (en) | Lithium battery core manufacturing system | |
| CN111933996A (en) | Manufacturing method of lithium battery | |
| JP5558912B2 (en) | Laminated battery pack and laminated outer packaging material for battery pack | |
| CN110828770A (en) | Manufacturing method of lithium battery | |
| CN216980703U (en) | Improve protection film and laminate polymer battery of laminate polymer battery surface fold | |
| CN110048036B (en) | Reinforcing rib sheet and preparation method thereof, battery cell and preparation method thereof, and soft package battery | |
| CN109037782B (en) | Film for improving surface wrinkles of soft package lithium ion battery and film pasting method | |
| CN111769333A (en) | Novel lamination method based on cutting and stacking all-in-one machine | |
| KR101253660B1 (en) | Process for Preparing of Battery Case for Improving Accuracy | |
| CN210052808U (en) | Concave winding type lithium battery | |
| WO2010124589A1 (en) | A battery and a manufacturing method for the battery | |
| CN213752785U (en) | Rich liquid state soft-packaged electrical core | |
| CN203134910U (en) | Lithium ion secondary battery | |
| CN113903971A (en) | Slat battery chip | |
| CN113140781B (en) | Laminated cell protection sheet, laminated battery assembly and method for manufacturing laminated battery | |
| CN216624510U (en) | Battery with improved battery capacity | |
| CN217589054U (en) | Lithium ion battery pole group and lithium ion battery | |
| CN217062218U (en) | Mylar film for lithium battery and square aluminum shell battery core | |
| WO2010124591A1 (en) | Battery and fabricating method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |