CN211307689U - Battery aluminum-plastic composite film - Google Patents

Battery aluminum-plastic composite film Download PDF

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CN211307689U
CN211307689U CN201922035344.7U CN201922035344U CN211307689U CN 211307689 U CN211307689 U CN 211307689U CN 201922035344 U CN201922035344 U CN 201922035344U CN 211307689 U CN211307689 U CN 211307689U
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layer
battery
aluminum
composite film
plastic composite
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CN201922035344.7U
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杜瑞平
段栋
贺梦江
张耀
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Xinwangda Power Technology Co ltd
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Sunwoda Electric Vehicle Battery Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The application discloses battery plastic-aluminum complex film, this battery plastic-aluminum complex film are including the nylon layer, first tie coat, aluminium foil layer, second tie coat, ceramic layer and the heat-seal layer that set gradually. The aluminum-plastic composite film of the battery has good puncture resistance due to the arrangement of the ceramic layer, has good insulativity and flame retardance, and is beneficial to prolonging the service life of the aluminum-plastic composite film of the battery, thereby being beneficial to ensuring the use stability of the lithium ion battery and enlarging the application range of the lithium ion battery.

Description

Battery aluminum-plastic composite film
Technical Field
The application relates to the field of battery packaging materials, in particular to a battery aluminum-plastic composite film.
Background
The secondary battery is also called as a rechargeable battery, and is more economical and environmentally friendly than the primary battery because of its reusability, and thus is widely used in daily life. Common secondary batteries include lithium ion batteries, lead-acid batteries, nickel metal hydride batteries, supercapacitors, and the like. The secondary battery case generally employs a metal case such as an aluminum case, a steel case, or a battery aluminum-plastic composite film, and any case is required to have a capability of isolating the battery contents from the external environment. The lithium ion battery is developed most rapidly in the secondary battery at present, the largest market scale is the lithium ion battery, the lithium ion battery is widely applied to electronic products such as mobile phones, notebook computers, unmanned planes, Bluetooth earphones, smart watches and charge pads at present, and a battery aluminum-plastic composite film shell has the advantages of light weight, small volume and the like compared with a metal shell, and the shape can be designed according to needs, so that in 3C digital products, the battery aluminum-plastic composite film is adopted as the shell of the lithium ion battery for a large part.
Because the lithium ion battery has high energy density and internal electrolyte and active materials are easy to react with moisture, the aluminum-plastic composite film of the battery is required to have high moisture barrier capability. The periphery of a battery core of the lithium ion battery is provided with burrs of a copper net and an aluminum net, when the battery core is vacuumized and contracted, the burrs can puncture the inner layer of the aluminum-plastic composite film of the battery, hydrofluoric acid in the battery core is in direct contact with the aluminum foil layer in the aluminum-plastic composite film of the battery, aluminum foil punctiform corrosion is caused, electrochemical corrosion is accelerated, the composition of electrolyte is changed, the aluminum-plastic composite film of the battery is corroded to penetrate and leak liquid when the battery is serious, and meanwhile, short circuit can be caused, so that the battery is scrapped.
SUMMERY OF THE UTILITY MODEL
The application provides a battery plastic-aluminum composite film for preparing soft package lithium cell, this battery plastic-aluminum composite film have good puncture resistance, have good insulating nature and fire resistance simultaneously, are favorable to improving the life of battery plastic-aluminum composite film.
The utility model provides a battery plastic-aluminum complex film for preparation soft packet of lithium cell, including the nylon layer that sets gradually, first tie coat, aluminium foil layer, second tie coat, ceramic layer and heat-seal layer.
In one embodiment, the ceramic layer comprises Al2O3Thin film layer and TiO2At least one of the thin film layers.
In one embodiment, the ceramic layer has a thickness of 1 μm to 50 μm.
In one embodiment, a third bonding layer is disposed between the ceramic layer and the heat seal layer.
In one embodiment, the third adhesive layer is selected from one of a polyurethane-based adhesive layer, an acrylic-based adhesive layer, and an epoxy-based adhesive layer.
In one embodiment, the thickness of the heat sealing layer is 20-120 μm.
In one embodiment, the thickness of the aluminum foil layer is 20-50 μm.
In one embodiment, the first adhesive layer is selected from one of a polyurethane-based adhesive layer, an acrylic-based adhesive layer, and an epoxy-based adhesive layer.
In one embodiment, the second adhesive layer is selected from one of a polyurethane-based adhesive layer, an acrylic-based adhesive layer, and an epoxy-based adhesive layer.
In one embodiment, the nylon layer has a thickness of 15 μm to 20 μm.
Above-mentioned battery plastic-aluminum complex film is through setting up the ceramic layer between aluminium foil layer and heat-seal layer, can improve performances such as puncture resistance, resistant electrolyte liquid nature, high temperature resistance, aqueous vapor barrier property of battery plastic-aluminum complex film greatly, improves the life of battery plastic-aluminum complex film to help ensureing the security and the stability that lithium ion battery used, improve the popularization and the application of lithium cell.
Drawings
FIG. 1 is a schematic structural diagram of a battery aluminum-plastic composite film according to an embodiment;
fig. 2 is a schematic structural view of a battery aluminum-plastic composite film according to another embodiment.
Detailed Description
In order to make the objects and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the battery aluminum-plastic composite film according to an embodiment includes a nylon layer 1, a first adhesive layer 2, an aluminum foil layer 3, a second adhesive layer 4, a ceramic layer 5, and a heat seal layer 6, which are sequentially disposed. Specifically, the aluminum-plastic composite film of the battery is used for preparing a soft package lithium battery.
Further, the nylon layer 1 has a thickness of about 15 μm to about 20 μm. Generally, the nylon layer 1 needs to be subjected to biaxial stretching treatment. Wherein the nylon layer 1 can be formed by nylon material, also can be formed by Polyester (PET) nylon co-extrusion layer, and the concrete constitution of nylon layer 1 is not limited in this application.
Further, the first adhesive layer 2 is selected from one of a polyurethane adhesive layer, an acrylic adhesive layer, and an epoxy adhesive layer.
Further, the aluminum foil layer 3 has a thickness of about 20 μm to about 50 μm.
Further, the second adhesive layer 4 is selected from one of a polyurethane adhesive layer, an acrylic adhesive layer, and an epoxy adhesive layer. The aluminum foil layer 3 and the ceramic layer 5 are connected and fixed by a second adhesive layer 4. In the related technology, ceramic particles are coated on an aluminum foil layer, although the water vapor barrier capacity and the puncture resistance of the battery aluminum-plastic composite film can be enhanced to a certain degree, the coated ceramic particles are microscopically accumulated on an aluminum foil, a large number of gaps exist among the particles, water vapor and electrolyte can be infiltrated through the gaps among the particles, and the effect of effective barrier cannot be achieved. In this application, adopt second tie coat 4 to bond ceramic layer 5 on 3 surfaces of aluminium foil layer, it is more stable to bond, can not take place because peeling off between the rete that ceramic particle drops and cause.
Further, the ceramic layer 5 includes Al2O3Film layer or TiO2At least one of the thin film layers. The ceramic layer 5 has a high melting point, so that in the heat sealing process of the battery aluminum-plastic composite film, although the heat sealing layer is melted and damaged, the ceramic layer is far higher than the melting point (100 ℃ -200 ℃) of the heat sealing layer, the ceramic layer 5 is not affected and remains intact, the aluminum foil layer is still isolated from electrolyte, the electrolyte resistance of the battery aluminum-plastic composite film is improved, and the water vapor barrier capability of the battery aluminum-plastic composite film is improved. Ceramic layer 5 sets up between aluminium foil layer 3 and heat-seal layer 6, even because the deckle edge of electric core inner structure impairs or lacerates the heat-seal layer, ceramic layer 5 can effectually block its further destruction to battery plastic-aluminum complex film, and its intensity can effectual resistant puncture, and ceramic layer 3 is electrolyte-resistant but also can effectively block electrolyte and 3 contacts on aluminium foil layer. In addition, the ceramic layer 3 has good insulating property, and can ensure the safe use of the battery core.
Further, the thickness of the ceramic layer 5 is 1 μm to 50 μm.
Further, the thickness of the heat-sealing layer 6 is 20 μm to 120 μm. CPP heat-seal layer is generally chooseed for use to heat-seal layer 6, and this application can use the material that field commonly used to the heat-seal layer, and the selection of specific material is no longer repeated one by one.
Referring to fig. 2, in another embodiment, the battery aluminum-plastic composite film includes a nylon layer 1, a first adhesive layer 2, an aluminum foil layer 3, a second adhesive layer 4, a ceramic layer 5, a third adhesive layer 7, and a heat seal layer 6, which are sequentially disposed. The third bonding layer 7 is arranged between the ceramic layer 5 and the heat seal layer 6, so that the firmness of connection between the ceramic layer 5 and the heat seal layer 6 is enhanced.
Further, the third adhesive layer 7 is selected from one of a polyurethane adhesive layer, an acrylic adhesive layer, and an epoxy adhesive layer.
In this embodiment, other structures and film layer settings are the same as those in the above embodiments, and are not described in detail in this application.
The following are several specific embodiments of the present application:
comparative example
The utility model provides a battery plastic-aluminum complex film for lithium ion battery, includes nylon layer, first tie coat, aluminium foil layer, second tie coat, the heat-seal layer that sets up according to this. Wherein the nylon layer is a nylon layer 1 which is biaxially stretched and has a thickness of 25 μm. The first adhesive layer 2 was composed of an acrylic urethane adhesive and had a thickness of 3 μm. The aluminium foil layer 3 has a thickness of 40 μm. The second adhesive layer 4 is made of a polyurethane adhesive and has a thickness of 4 μm. The heat sealing layer is CPP, and the thickness is 80 μm.
Example 1
As shown in fig. 2, the present embodiment provides a battery aluminum-plastic composite film for a lithium ion battery, which includes a nylon layer 1, a first adhesive layer 2, an aluminum foil layer 3, a second adhesive layer 4, a ceramic layer 5, a third adhesive layer 7, and a heat-sealing layer 6, which are sequentially disposed. Wherein: the nylon layer 1 was a biaxially stretched nylon layer having a thickness of 25 μm.
The first adhesive layer 2 was composed of an acrylic urethane adhesive and had a thickness of 3 μm.
The aluminium foil layer 3 has a thickness of 40 μm.
The second adhesive layer 4 is made of a polyurethane adhesive and has a thickness of 4 μm.
The ceramic layer 5 is Al2O3Film, thickness 10 μm.
The third adhesive layer 6 is made of a polyurethane adhesive and has a thickness of 5 μm.
The heat sealing layer is CPP, and the thickness is 65 mu m.
The results of the performance tests of the battery aluminum-plastic composite film for a lithium battery in this example are shown in the following table.
Figure BDA0002284881040000051
The copper precipitation test is a method for testing the breakage resistance of the inner layer of the aluminum-plastic composite film of the battery, which embodies the high temperature resistance and electrolyte resistance of the aluminum-plastic composite film of the battery, and specifically comprises the following steps: step 1, cutting the battery aluminum-plastic composite film to be tested, wherein the width of the battery aluminum-plastic composite film is 15cm, and the length of the battery aluminum-plastic composite film is 40cm, and folding the battery aluminum-plastic composite film in half along the length direction; a Step 2 heat sealing machine carries out heat sealing on two side edges of the battery aluminum-plastic composite film 10 and 20 by using a 5mm wide heat sealing strip with the temperature of 210 ℃, the time of 8s and the pressure of 0.5 MPa; step 3, standing the battery aluminum-plastic composite film bag with three sealed sides, opening upwards, and filling saturated CuSO4Solution of CuSO4The liquid level of the solution reaches a position 5 +/-1 cm away from the opening; step4 refers to the method of patent publication No. CN 205982161U, and detects whether aluminum layers are exposed at the sealing positions at two sides of the battery aluminum-plastic composite film bag.
The puncture resistance is tested by flattening and fixing the aluminum-plastic composite film of the battery by using a clamp, and then using a needle with the front end R being 0.5mm and the diameter of the needle
Figure BDA0002284881040000052
The steel needle of (2) punctures the battery aluminum-plastic composite film at the speed of 50mm/min, 10 samples are measured, and the average value is taken.
The packaging strength is measured by heat-sealing the cell aluminum-plastic composite film under the appropriate heat-sealing conditions determined by experiments, and testing 10 samples according to the specification of QB/T2358-1998, wherein the average value of 10 samples is taken as a record value.
The peel strength test method comprises the steps of cutting a sample into strips with the width of 15mm and the length of 120mm, peeling off 50mm of each of two sides of an interface to be tested in advance, clamping the two peeled sides by using a tensile testing machine, stretching at the speed of 100mm/min, recording a platform part of the tensile force of a software interface, and calculating an average value to serve as the peel strength value. 10 samples were tested and the average of 10 samples was recorded.
Water and gas barrierThe test method comprises the steps of operating according to Step 1 and Step 2 of the copper precipitation test to manufacture the aluminum-plastic composite film bag of the battery, and injecting 25mL of electrolyte into the bag, wherein the electrolyte comprises electrolyte LiPF6Ethylene carbonate, diethyl carbonate and dimethyl carbonate are used as solvents, and the concentration is 1 mol/L; the bag was then sealed at the open side with a 10mm wide heat seal and the initial weight was weighed. Placing the aluminum-plastic composite film bag of the battery in an environment with 65 ℃ and 95% Relative Humidity (RH) for one year, and calculating the weight change rate according to the following formula:
weight change rate (initial weight-weight after one year)/initial weight, weight change rate is used as a means to characterize the water vapor barrier capability.
Example 2
As shown in fig. 2, the present embodiment provides a battery aluminum-plastic composite film for a lithium ion battery, which includes a nylon layer 1, a first adhesive layer 2, an aluminum foil layer 3, a second adhesive layer 4, a ceramic layer 5, a third adhesive layer 7, and a sealing layer 6.
The nylon layer is a nylon and PET co-extrusion layer, and the thickness is 30 mu m.
The first adhesive layer 2 is made of a polyurethane adhesive.
The aluminium foil layer 3 has a thickness of 35 μm.
The second adhesive layer 4 is composed of an acrylic adhesive.
The ceramic layer 5 is Al2O3Film, thickness 20 μm.
The third adhesive layer 7 is made of epoxy resin adhesive.
The heat sealing layer 6 is CPP with the thickness of 80 μm.
Example 3
As shown in fig. 1, the present embodiment provides a battery aluminum-plastic composite film for a lithium ion battery, which includes a nylon layer 1, a first adhesive layer 2, an aluminum foil layer 3, a second adhesive layer 4, a ceramic layer 5, and a heat-sealing layer 6, which are sequentially disposed.
The nylon layer is a nylon and PET co-extrusion layer, and the thickness is 25 μm.
The first adhesive layer 2 is made of a polyurethane adhesive.
The aluminium foil layer 3 has a thickness of 40 μm.
The second adhesive layer 4 is composed of an acrylic adhesive.
The ceramic layer 5 is TiO2Film thickness 5 μm.
The heat sealing layer 6 is CPP with the thickness of 80 μm.
The above description is only for the preferred embodiments of the present application, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present application, and all equivalent substitutions or changes according to the technical solutions and the application concepts of the present application should be covered by the scope of the present application.

Claims (10)

1. The utility model provides a battery plastic-aluminum complex film which characterized in that, including nylon layer, first tie coat, aluminium foil layer, second tie coat, ceramic layer and the heat-seal layer that sets gradually.
2. The battery aluminum-plastic composite film according to claim 1, wherein the ceramic layer comprises Al2O3Thin film layer and TiO2At least one of the thin film layers.
3. The battery aluminum-plastic composite film according to claim 1 or 2, wherein the thickness of the ceramic layer is 1 μm to 50 μm.
4. The battery aluminum-plastic composite film according to claim 1 or 2, wherein a third adhesive layer is arranged between the ceramic layer and the heat seal layer.
5. The battery aluminum-plastic composite film according to claim 4, wherein the third adhesive layer is one selected from a polyurethane adhesive layer, an acrylic adhesive layer, and an epoxy adhesive layer.
6. The battery aluminum-plastic composite film according to claim 1, wherein the thickness of the heat seal layer is 20 μm to 120 μm.
7. The battery aluminum-plastic composite film according to claim 1, wherein the thickness of the aluminum foil layer is 20 μm to 50 μm.
8. The battery aluminum-plastic composite film according to claim 1, wherein the first adhesive layer is one selected from a polyurethane adhesive layer, an acrylic adhesive layer, and an epoxy adhesive layer.
9. The battery aluminum-plastic composite film according to claim 1, wherein the second adhesive layer is one selected from a polyurethane adhesive layer, an acrylic adhesive layer, and an epoxy adhesive layer.
10. The battery aluminum-plastic composite film according to claim 1, wherein the thickness of the nylon layer is 15 μm to 20 μm.
CN201922035344.7U 2019-11-22 2019-11-22 Battery aluminum-plastic composite film Active CN211307689U (en)

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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province

Patentee after: Xinwangda Power Technology Co.,Ltd.

Address before: 518107 xinwanda, No.18, Tangjia South Road, Guangming New District, Shenzhen City, Guangdong Province

Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd.

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