An aluminum-plastic film, a battery, a battery module, and an electrical device

Abstract

The utility model relates to lithium ion battery technical field, especially relates to a kind of aluminium plastic film, battery, battery module and electrical equipment.The innermost layer of the aluminium plastic film of the utility model is hot melt glue layer, when using this kind of aluminium plastic film as the shell material of lithium ion battery, the large-area bonding of shell and pole core assembly can be realized, to improve the bonding area of shell and pole core assembly, and further improve the anti-drop capability of lithium ion battery.The utility model further provides a kind of battery using the above-mentioned aluminium plastic film as shell.The utility model further provides a kind of battery module and electrical equipment.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to an aluminum-plastic film, a battery, a battery module, and an electrical device. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronics and other products requiring power and energy storage due to their advantages such as high energy density, high operating voltage, long cycle life, and no memory effect. The safety of lithium-ion batteries is a major concern in the industry, especially their drop resistance, which is a core indicator for evaluating their safety performance.

[0003] In existing technologies, aluminum-plastic film is used as the casing of lithium batteries, and the aluminum-plastic film and the electrode core components need to be bonded together using hot melt adhesive. However, the hot melt adhesive tapes currently on the market are relatively thick, such as 80 micrometers, 45 micrometers, and 25 micrometers. Although the use of hot melt adhesive tape can achieve the bonding between the aluminum-plastic film and the electrode core components and improve the battery's drop resistance, it limits the energy density of the lithium battery.

[0004] Developing an aluminum-plastic film that can improve the drop resistance of batteries without sacrificing the energy density of lithium batteries has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To address the problems and shortcomings of existing technologies, this utility model provides an aluminum-plastic film, a battery, a battery module, and an electrical device. The aluminum-plastic film in this utility model comprises, in sequence: Nylon layer; First adhesive layer; An aluminum layer, wherein the aluminum layer and the nylon layer are bonded together by the first adhesive layer; Second adhesive layer; A polypropylene layer, wherein the polypropylene layer and the aluminum layer are bonded together by a second adhesive layer; A hot melt adhesive layer covering the polypropylene layer.

[0006] Optionally, the aluminum-plastic film further includes: Third adhesive layer; A polyethylene terephthalate layer, wherein the polyethylene terephthalate layer is bonded to the nylon layer via the third adhesive layer.

[0007] Optionally, the thickness of the hot melt adhesive layer is 1~10µm.

[0008] Optionally, the hot melt adhesive layer is one or more of polyamide hot melt adhesive, polyethylene hot melt adhesive, polyurethane hot melt adhesive, and ethylene-vinyl acetate copolymer hot melt adhesive.

[0009] Optionally, the thickness of the nylon layer is 15μm~30μm, the thickness of the aluminum layer is 30μm~40μm, the thickness of the polypropylene layer is 30μm~80μm, the thickness of the first adhesive layer is 2μm~5μm, and the thickness of the second adhesive layer is 2μm~5μm.

[0010] Optionally, the thickness of the polyethylene terephthalate layer is 10 μm to 15 μm, the thickness of the third adhesive layer is 2 μm to 5 μm, the thickness of the nylon layer is 15 μm to 30 μm, the thickness of the aluminum layer is 30 μm to 40 μm, the thickness of the polypropylene layer is 30 μm to 80 μm, the thickness of the first adhesive layer is 2 μm to 5 μm, the thickness of the second adhesive layer is 2 μm to 5 μm, and the thickness of the hot melt adhesive layer is 1 to 10 μm.

[0011] This utility model also provides a battery, the battery comprising an aluminum-plastic film and an electrode assembly as described in any of the above claims; the aluminum-plastic film serves as the battery casing, the electrode assembly is disposed within the casing and bonded to the hot melt adhesive layer.

[0012] Optionally, the pole core assembly is a wound core assembly.

[0013] This utility model also provides a battery module, which includes batteries as described in any of the above claims, wherein there are multiple batteries connected in series and / or in parallel.

[0014] This utility model also provides an electrical device, which includes a battery as described in any of the above claims, or includes the above battery module.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) A new aluminum-plastic film is provided, which enables large-area bonding between the casing and the electrode core assembly when the aluminum-plastic film is used as the casing material of the lithium-ion battery, thereby increasing the bonding area between the casing and the electrode core assembly and thus improving the drop resistance of the lithium-ion battery.

[0016] (2) Compared with the hot melt adhesive tape used in the prior art, the thickness of the hot melt adhesive layer on the aluminum-plastic film is controlled at 1~10μm, which is thinner than the hot melt adhesive tape. This reduces the thickness of the adhesive layer, increases the volume occupancy of the core component, and improves the battery energy density.

[0017] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0018] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic diagram of the structure of an aluminum-plastic film according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the aluminum-plastic film according to another embodiment of this utility model; Figure 3 This is a cross-sectional schematic diagram of a battery according to an embodiment of the present invention.

[0019] In the diagram: 10-aluminum-plastic film, 11-hot melt adhesive layer, 12-polypropylene layer, 13-first adhesive layer, 14-aluminum layer, 15-second adhesive layer, 16-nylon layer, 17-third adhesive layer, 18-polyethylene terephthalate layer; 20-core component. Detailed Implementation

[0020] The following reference Figures 1 to 3 This invention describes an aluminum-plastic film, a battery, a battery module, and an electrical device according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0021] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] Figure 1 This is a schematic diagram of the structure of an aluminum-plastic film according to an embodiment of the present invention. Figure 1As shown, this utility model provides an aluminum-plastic film. The aluminum-plastic film 10 of this utility model includes a nylon layer 16, a first adhesive layer 13, an aluminum layer 14, a second adhesive layer 15, a polypropylene layer 12, and a hot melt adhesive layer 11 arranged sequentially. The aluminum layer 14 and the nylon layer 16 are bonded together by the first adhesive layer 13. The polypropylene layer 12 and the aluminum layer 14 are bonded together by the second adhesive layer 15. The hot melt adhesive layer 11 covers the polypropylene layer 12.

[0023] Specifically, a layer of hot melt adhesive is coated on the inner layer of the aluminum-plastic film 10, namely the polypropylene layer 12, so that the innermost layer of the aluminum-plastic film 10 structure is the hot melt adhesive layer 11.

[0024] In this embodiment, the innermost layer of the aluminum-plastic film 10 is a hot melt adhesive layer 11. Using this aluminum-plastic film 10 as the casing of the lithium-ion battery enables large-area bonding between the casing and the electrode core assembly 20, thereby increasing the bonding area between the casing and the electrode core assembly 20 and thus improving the drop resistance of the lithium-ion battery.

[0025] like Figure 2 As shown, in some embodiments of this invention, the aluminum-plastic film 10 further includes a polyethylene terephthalate layer 18 and a third adhesive layer 17. The polyethylene terephthalate layer 18 is bonded to the nylon layer 16 via the third adhesive layer 17.

[0026] Poly(ethylene terephthalate) possesses excellent barrier properties, heat resistance, mechanical strength, and environmental performance. In this embodiment, using a poly(ethylene terephthalate) layer 18 on the aluminum-plastic film 10 structure can further improve the impact resistance and puncture resistance of the aluminum-plastic film 10.

[0027] In some embodiments of this invention, the thickness of the hot melt adhesive layer 11 is 1~10 μm. In this embodiment, controlling the thickness of the hot melt adhesive layer to be in the range of 1~10 μm, which is less than the thickness of conventional hot melt adhesive tape, can increase the volume ratio of the core assembly 20 in the battery, thereby increasing the energy density of the battery.

[0028] It should be noted that the thickness of the adhesive layer 13 is any value between 1 and 10 μm, such as 1 μm, 1.2 μm, 1.8 μm, 2.0 μm, 3.5 μm, 4.2 μm, etc.

[0029] In some embodiments of this utility model, the hot melt adhesive layer 11 is one or more of polyamide hot melt adhesive, polyethylene hot melt adhesive, polyurethane hot melt adhesive, and ethylene-vinyl acetate copolymer hot melt adhesive.

[0030] In this embodiment, the hot melt adhesive is selected from one of polyamide hot melt adhesive, polyethylene hot melt adhesive, polyurethane hot melt adhesive, and ethylene-vinyl acetate copolymer hot melt adhesive, or two or more of them are selected and combined, which improves the selectivity and diversity of the hot melt adhesive layer and facilitates the selection of the hot melt adhesive layer.

[0031] In some embodiments of this utility model, the hot melt adhesive layer 11 is applied to the polypropylene layer 12 by one or more of the following methods: roller coating, foam coating, spiral spraying, and flat die coating.

[0032] In this embodiment, the coating method is selected from roller coating, foam coating, spiral spraying, flat die coating, or a combination of two or more, which improves the selectivity and diversity of the coating method of hot melt adhesive layer 11.

[0033] In some embodiments of this utility model, the thickness of the nylon layer 16 is 15μm~30μm, the thickness of the aluminum layer 14 is 30μm~40μm, the thickness of the polypropylene layer 12 is 30μm-80μm, the thickness of the first adhesive layer is 2~5μm, and the thickness of the second adhesive layer is 2μm~5μm.

[0034] In this embodiment, the thicknesses of the nylon layer 16, aluminum layer 14, and polypropylene layer 12 are designed to ensure that the aluminum-plastic film 10 has high impact resistance and puncture resistance, while avoiding increased costs and reduced battery energy density caused by excessive thickness of the aluminum-plastic film 10. The thicknesses of the first adhesive layer 13 and the second adhesive layer 15 ensure stable bonding between the different structural layers of the aluminum-plastic film 10, while also preventing a reduction in battery energy density due to excessive thickness.

[0035] In some embodiments of this utility model, the thickness of the polyethylene terephthalate layer 18 is 10 μm to 15 μm, the thickness of the third adhesive layer is 2 μm to 5 μm, the thickness of the nylon layer 16 is 15 μm to 30 μm, the thickness of the aluminum layer 14 is 30 μm to 40 μm, the thickness of the polypropylene layer 12 is 30 μm to 80 μm, the thickness of the first adhesive layer is 2 μm to 5 μm, the thickness of the second adhesive layer is 2 to 5 μm, and the thickness of the hot melt adhesive layer 11 is 1 μm to 10 μm.

[0036] In this embodiment, the thickness range of the third adhesive layer 17 ensures stable adhesion between the polyethylene terephthalate layer 18 and the polypropylene layer 12, while also preventing a decrease in battery energy density due to excessive thickness. The thickness range of the polyethylene terephthalate layer 18 further improves the impact resistance of the aluminum-plastic film 10.

[0037] like Figure 3As shown, this utility model also provides a battery, which includes an aluminum-plastic film 10 and an electrode assembly 20 as described in any of the above embodiments. The aluminum-plastic film 10 serves as the battery casing, and the electrode assembly 20 is disposed inside the casing and bonded to a hot melt adhesive layer 11.

[0038] In this embodiment, the aluminum-plastic film 10 described above is used as the battery casing to improve the battery's drop resistance.

[0039] In some embodiments of this invention, the electrode core assembly 20 is a wound core assembly. In this embodiment, the wound electrode core assembly 20 has the advantages of high production efficiency and low cost.

[0040] This utility model also provides a battery module, which includes multiple batteries as described in any of the above embodiments, with the multiple batteries connected in series.

[0041] The battery module of this application contains multiple batteries, effectively increasing the capacity and application range of the battery module. Those skilled in the art can select an appropriate number based on the application and capacity of the battery module.

[0042] This utility model also provides a battery module, which includes multiple batteries as described in any of the above embodiments, and the multiple batteries are connected in parallel.

[0043] In this embodiment, multiple batteries are connected in parallel, which enables the battery module to achieve a higher battery capacity. Furthermore, when one battery is depleted or malfunctions, it does not affect the continued power supply of other batteries that are low on power, thereby ensuring the continuous operation of the electrical equipment.

[0044] This utility model also provides a battery module, which includes multiple batteries produced by any of the battery production equipment described above, with the multiple batteries connected in series.

[0045] The battery module of this application contains multiple batteries, effectively increasing the capacity and application range of the battery module. Those skilled in the art can select an appropriate number based on the application and capacity of the battery module.

[0046] In some other embodiments of this utility model, the battery module includes multiple batteries produced by the battery production equipment in any of the above embodiments, and the multiple batteries are connected in parallel.

[0047] In this embodiment, multiple batteries are connected in parallel, which enables the battery module to achieve a higher battery capacity. Furthermore, when one battery is depleted or malfunctions, it does not affect the continued power supply of other batteries in the battery module, thereby ensuring the continuous operation of the electrical equipment.

[0048] This utility model also provides an electrical device, which includes the battery in any of the above embodiments.

[0049] The electrical device used in this application embodiment is not particularly limited, and can be any electrical device known in the prior art. In some embodiments, the electrical device may include, but is not limited to, electronic cigarettes, electronic vaporizers, wireless headphones, robot vacuum cleaners, drones, laptops, pen input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, over-ear stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, household large-capacity batteries, and lithium-ion capacitors, etc.

[0050] In some other embodiments of this invention, the electrical device includes the battery module described in any of the above embodiments.

[0051] In this embodiment, the battery module is designed according to the actual situation to enable the battery module to have more efficient energy transfer.

[0052] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0053] Example 1 A square battery has a wound core assembly as its main body and an aluminum-plastic composite shell as its outer casing. The aluminum-plastic shell comprises, from the outside in, a nylon layer, a first adhesive layer, an aluminum layer, a second adhesive layer, a polypropylene layer, a third adhesive layer, polyethylene terephthalate (PET), and a hot-melt adhesive layer, with the adhesive layer having a thickness of 10 μm. The wound core assembly is encapsulated within the aluminum-plastic shell. The battery cell is then manufactured through processes such as core pressing, encapsulation, and formation. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2 MPa. After the hot-press formation process, the hot-melt adhesive sprayed onto the core assembly body firmly bonds the core assembly body and the aluminum-plastic film together.

[0054] Example 2 A square battery has a wound core assembly as its main body and an aluminum-plastic composite shell as its outer casing. The aluminum-plastic shell comprises, from the outside in, a nylon layer, a first adhesive layer, an aluminum layer, a second adhesive layer, a polypropylene layer, a third adhesive layer, polyethylene terephthalate (PET), and a hot melt adhesive layer, the adhesive layer being 5µm thick. The wound core assembly is encapsulated within the aluminum-plastic shell. The battery cell is then manufactured through processes such as core pressing, encapsulation, and formation. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2 MPa. After the hot-pressing formation process, the hot melt adhesive sprayed onto the core assembly body firmly bonds the core assembly body and the aluminum-plastic film together.

[0055] Example 3 A square battery has a wound core assembly as its main body and an aluminum-plastic composite shell as its casing. The aluminum-plastic shell comprises, from the outside in, a nylon layer, a first adhesive layer, an aluminum layer, a second adhesive layer, a polypropylene layer, a third adhesive layer, polyethylene terephthalate (PET), and a hot-melt adhesive layer, with the adhesive layer having a thickness of 1 μm. The wound core assembly is encapsulated within the aluminum-plastic shell. The battery cell is then manufactured through processes such as core pressing, encapsulation, and formation. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2 MPa. After the hot-press formation process, the hot-melt adhesive sprayed onto the core assembly body firmly bonds the core assembly body and the aluminum-plastic film together.

[0056] Comparative Example A square battery has a wound core assembly. Hot melt adhesive tape, 45µm thick and 2mm wide, is adhered to the center of the wound core assembly. The cell is then manufactured through encapsulation and formation processes. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2MPa. After the hot-pressing formation process, the hot melt adhesive tape adhered to the core assembly body effectively bonds the core assembly body and the aluminum-plastic film together.

[0057] Drop tests, micro-drop tests, and roller tests were performed on the above Examples 1 to 3 and the comparative examples.

[0058] Drop test: Take 10 batteries for each group, fully charge the batteries at 0.5C, and drop them freely from a height of 1 meter onto a smooth concrete surface. Drop them once in each of the 6 directions (X, Y, Z, positive and negative) for a total of 6 drops. Increase the number of consecutive drops to 12 (repeated twice in each direction).

[0059] The standard for qualification is that the battery is qualified if it does not exhibit safety issues such as bulging, leakage, overheating, smoking, or catching fire.

[0060] Slight drop test: Take 10 batteries for each group, fully charge the batteries at 0.5C, and drop them freely from a height of 15 cm onto a smooth concrete surface. Drop them 1000 times in each of the 6 directions (X, Y, Z, positive and negative) for a total of 6000 drops.

[0061] The standard for qualification is that the battery is qualified if it does not exhibit safety issues such as bulging, leakage, overheating, smoking, or catching fire.

[0062] Roller test: Take 10 batteries for each group, fully charge the batteries at 0.5C, use a 1.5-meter diameter roller with 50-millimeter diameter steel balls inside to put the batteries into the roller, and let the roller roll continuously at a speed of 10 revolutions per minute for 60 minutes.

[0063] The standard for qualification is that the battery is qualified if it does not exhibit safety issues such as bulging, leakage, overheating, smoking, or catching fire.

[0064] The test results are shown in Table 1.

[0065] Table 1 Battery performance test results As can be seen from the test results in Table 1, the drop test, micro-drop test and roller test results of Examples 1 to 3 are all better than those of the comparative examples.

[0066] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. An aluminum-plastic film, characterized in that, The aluminum-plastic film comprises, in sequence: Nylon layer; First adhesive layer; An aluminum layer, wherein the aluminum layer and the nylon layer are bonded together by the first adhesive layer; Second adhesive layer; A polypropylene layer, wherein the polypropylene layer and the aluminum layer are bonded together by a second adhesive layer; A hot melt adhesive layer covering the polypropylene layer.

2. The aluminum-plastic film according to claim 1, characterized in that, Also includes: Third adhesive layer; A polyethylene terephthalate layer, wherein the polyethylene terephthalate layer is bonded to the nylon layer via the third adhesive layer.

3. The aluminum-plastic film according to claim 1 or 2, characterized in that, The thickness of the hot melt adhesive layer is 1~10um.

4. The aluminum-plastic film according to claim 3, characterized in that, The hot melt adhesive layer is one or more of polyamide hot melt adhesive, polyethylene hot melt adhesive, polyurethane hot melt adhesive, and ethylene-vinyl acetate copolymer hot melt adhesive.

5. The aluminum-plastic film according to claim 1, characterized in that, The thickness of the nylon layer is 15μm~30μm, the thickness of the aluminum layer is 30μm~40μm, the thickness of the polypropylene layer is 30μm~80μm, the thickness of the first adhesive layer is 2μm~5μm, and the thickness of the second adhesive layer is 2μm~5μm.

6. The aluminum-plastic film according to claim 2, characterized in that, The thickness of the polyethylene terephthalate layer is 10 μm to 15 μm, the thickness of the third adhesive layer is 2 μm to 5 μm, the thickness of the nylon layer is 15 μm to 30 μm, the thickness of the aluminum layer is 30 μm to 40 μm, the thickness of the polypropylene layer is 30 μm to 80 μm, the thickness of the first adhesive layer is 2 μm to 5 μm, the thickness of the second adhesive layer is 2 μm to 5 μm, and the thickness of the hot melt adhesive layer is 1 to 10 μm.

7. A battery, characterized in that, Includes the aluminum-plastic film and electrode assembly as described in any one of claims 1-6; the aluminum-plastic film serves as the battery casing, the electrode assembly is disposed within the casing and bonded to the hot melt adhesive layer.

8. The battery according to claim 7, characterized in that, The core assembly is a wound core assembly.

9. A battery module, characterized in that, Includes the battery as described in claim 7 or 8, wherein there are multiple batteries, and the multiple batteries are connected in series and / or in parallel.

10. An electrical appliance, characterized in that, The electrical equipment includes a battery as described in any one of claims 1-5, or includes a battery module as described in claim 9.

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