A packaging protective film and shell for storage battery

Abstract

The utility model discloses a packaging protective film for a storage battery, comprising: a barrier composite layer, having a first surface and a second surface relative to each other along the film thickness; an antistatic coating, which is arranged on the first surface and the second surface; the barrier composite layer comprises a PETG outer layer and a heat-sealing layer, the heat-sealing layer being one of an APET layer, a PETG layer and a PET layer; the barrier composite layer is provided with a recessed portion on the surface of the PETG outer layer, the recessed portions extend along a first direction and are arranged at intervals along a second direction. The barrier composite layer adopts PETG material as its outer layer, which improves the mechanical properties such as toughness and impact strength of the protective film, prolongs the service life and maintains the appearance; and is combined with the heat-sealing layer to improve the barrier performance of the protective film; the provision of the antistatic coating can release or neutralize the static charge generated on the surface of the material, effectively reducing the damage caused by static discharge to the internal components of the product; and safety performance is provided by the recessed portion provided on the PETG outer layer.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging materials, in particular to a packaging protective film and a shell for a storage battery. Background Art

[0002] The battery is an important component of the power system. Its outer packaging must meet the requirements of shockproof, moisture-proof, dust-proof, and corrosion-proof to ensure the safety and reliability of the battery during transportation and storage. In addition, the battery packaging must also have a certain degree of compressive strength and impact resistance to cope with vibration and impact during transportation.

[0003] Currently, a commonly used metal aluminum foil layer is used as a barrier layer and is composited with an insulating material to produce a packaging protective film. However, the recycling process is complicated, and has high requirements for recycling technology and facilities, which is not conducive to the recycling of resources.

[0004] Therefore, it is necessary to improve the packaging protective film for batteries in the prior art. Utility Model Content

[0005] One of the purposes of the utility model is to overcome the defects existing in the prior art and provide a packaging protective film for a storage battery. The barrier composite layer adopts PETG material as its outer layer, so as to improve the toughness and impact strength and other mechanical properties of the protective film, prolong the service life and maintain the appearance; the heat sealing layer is combined to improve the barrier performance of the protective film; the setting of the antistatic coating can release or neutralize the static charge generated on the surface of the material and effectively reduce the damage caused by static discharge to the internal components of the product; and the safety performance is provided by the recessed portion set in the PETG outer layer.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: a packaging protective film for a storage battery, comprising:

[0007] a barrier composite layer having a first surface and a second surface opposite to each other along the thickness of the film;

[0008] An antistatic coating is disposed on the first surface and the second surface;

[0009] The barrier composite layer comprises a PETG outer layer and a heat-sealing layer, wherein the heat-sealing layer is one of an APET layer, a PETG layer and a PET layer;

[0010] The barrier composite layer is provided with recessed parts on the surface of the PETG outer layer, and the recessed parts extend along the first direction and are arranged at intervals along the second direction.

[0011] A preferred technical solution is that a barrier core layer is provided between the PETG outer layer and the heat-sealing layer, and the barrier core layer is an APET layer or a PET layer.

[0012] A preferred technical solution is that the recessed portion is provided through the PETG outer layer and penetrates into the barrier core layer to a depth of 5% to 10% of the thickness of the barrier core layer; or the recessed portion is provided through the PETG outer layer and the barrier core layer and penetrates into the heat sealing layer to a depth of 5% to 10% of the thickness of the heat sealing layer.

[0013] A preferred technical solution is that the recessed portion is filled with the antistatic coating.

[0014] A preferred technical solution is that a flame retardant interlayer and / or a toughening interlayer is provided between the PETG outer layer and the barrier core layer and between the barrier core layer and the heat sealing layer.

[0015] A preferred technical solution is that the PETG outer layer is a flame retardant outer layer or a toughened outer layer; and the heat sealing layer is a flame retardant heat sealing layer or a toughened heat sealing layer.

[0016] A preferred technical solution is that the barrier core layer is a flame retardant core layer.

[0017] The preferred technical solution is that the thickness of the PETG outer layer accounts for 5% to 10% of the total thickness of the barrier composite layer, the thickness of the barrier composite layer is 250 to 320 μm, and the thickness of the antistatic coating is 1 to 3 μm.

[0018] The second purpose of the utility model is to overcome the defects existing in the prior art and provide a packaging shell for a battery. The packaging shell is made of the above-mentioned packaging protective film for the battery. The packaging shell is provided with a receiving groove for installing the battery, and the groove length extension direction of the receiving groove is consistent with the first direction.

[0019] A preferred technical solution is that the slot cover of the containing slot is provided with a sealing layer, and a sealing portion is provided between the sealing layer and the heat-sealing layer.

[0020] The advantages and beneficial effects of the utility model are:

[0021] The battery packaging protective film has a reasonable structure. The barrier composite layer uses PETG material as its outer layer to improve the toughness and impact resistance of the protective film, preventing vibration and impact during transportation from causing product deformation or outer packaging rupture; combined with a heat-sealing layer to improve the barrier performance of the protective film;

[0022] The setting of antistatic coating can release or neutralize the static charge generated on the surface of the material, thereby avoiding the adsorption of dust, particles and other impurities due to static electricity, which has a negative impact on the electronics industry and effectively reduces the damage caused by electrostatic discharge to the internal components of the product;

[0023] The recessed portion provided on the outer layer of PETG can break to release pressure and prevent the electronic product from exploding, causing the shell to expand and causing a safety accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a packaging shell for a battery of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the packaging protective film for storage batteries of the utility model;

[0026] Figure 3 This is a schematic structural diagram of Embodiment 2 of the packaging protective film for storage batteries of the utility model;

[0027] Figure 4 It is a structural schematic diagram of Example 3 of the packaging protective film for batteries of the utility model.

[0028] In the figure: 1, barrier composite layer; 2, antistatic coating; 3, packaging shell; 10, barrier core layer; 11, PETG outer layer; 12, heat sealing layer; 13, flame retardant interlayer; 14, toughening interlayer; 30, receiving groove; 31, sealing part; 100, recessed part; 101, first surface; 102, second surface. DETAILED DESCRIPTION

[0029] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0030] The terms “outside” and “surface” are based on the normal use state of the battery packaging protective film and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0032] like Figure 1As shown, the utility model discloses a packaging protective film for a storage battery, comprising a barrier composite layer 1 and an antistatic coating 2, wherein the barrier composite layer 1 has a first surface 101 and a second surface 102 opposite to each other along the film thickness, and the antistatic coating 2 is disposed on the first surface 101 and the second surface 102, respectively, and the barrier composite layer 1 comprises a PETG outer layer 11 and a heat sealing layer 12, wherein the heat sealing layer 12 is one of an APET layer, a PETG layer and a PET layer. The barrier composite layer 1 is provided with a recessed portion 100 in the PETG outer layer 11, and the recessed portions 100 extend along the first direction and are arranged at intervals along the second direction.

[0033] The accidental explosion of the battery causes the shell to expand, and the recessed portion is provided to rupture and release the pressure, thereby improving the safety factor of the shell made of the packaging protective film in dealing with sudden accidents during use.

[0034] The first direction is an arbitrary direction.

[0035] In some embodiments, the heat seal layer 12 is an APET layer. APET (Amorphous Polyethylene Terephthalate) refers to amorphous polyethylene terephthalate, which is a specially treated PET material. Compared with conventional PET (crystalline polyethylene terephthalate), APET has high optical transparency and light transmittance; due to its amorphous structure, APET can still maintain high impact strength and toughness at low temperatures and is not easy to break; it has good thermoforming properties and can be made into products of various shapes by vacuum forming, blow molding, etc. at high temperatures, and can maintain a stable shape after cooling, which meets the mechanical strength requirements of the battery protection shell; it is a recyclable plastic material, in line with modern environmental protection concepts, and can be recycled and reused after being discarded; it has a good barrier effect on gases (such as oxygen and water vapor), can effectively extend the shelf life of the product in the package and play a moisture-proof role.

[0036] In some embodiments, the heat-sealing layer 12 is a PETG layer. PETG (Polyethylene Terephthalate Glycol) is a transparent, non-crystalline copolyester, which is formed by terephthalic acid (PTA), ethylene glycol (EG) and 1,4-cyclohexanedimethanol (CHDM) through ester exchange polycondensation. PETG has high toughness and impact strength, and its impact resistance is better than that of ordinary PET materials. It can still maintain good flexibility even at low temperatures; it has better stability and dimensional stability during high-temperature processing; it has excellent transparency and glossiness, and is suitable for making packaging or display products that require high transparency; it has excellent chemical corrosion resistance and is not easily affected by many chemicals; it is an environmentally friendly plastic that can be recycled and reused, meeting the requirements of sustainable development; it is easy to be processed by various methods such as thermoforming, injection molding, and extrusion.

[0037] In some embodiments, the heat sealing layer 12 is a PET layer. PET (polyethylene terephthalate) has good mechanical properties, such as hardness, strength and impact resistance; high transparency, suitable for packaging materials; good chemical corrosion resistance and heat resistance; and is recyclable.

[0038] PETG as an outer layer provides good weather resistance and processing performance. In order to ensure good gas barrier properties of the battery packaging, the heat sealing layer 12 is further a PET layer or an APET layer. Furthermore, the heat sealing layer 12 is a PET layer, which has the best electrical insulation performance and better safety performance in contact with the battery.

[0039] In order to further enhance the mechanical strength of the barrier composite layer, a barrier core layer 10 is provided between the PETG outer layer 11 and the heat sealing layer 12 , and the barrier core layer 10 is an APET layer or a PET layer.

[0040] In some embodiments, the depth of the recessed portion 100 penetrating the PETG outer layer 11 and penetrating into the barrier core layer 10 is 5% to 10% of the thickness of the barrier core layer 10; for example, the barrier composite layer 1 is a laminated structure of PETG outer layer / PET layer / APET layer, or PETG outer layer / PET layer / PET layer; wherein, considering the cost and ensuring the mechanical properties and barrier properties of the barrier composite layer, the thickness of the PETG outer layer 11 is 20 to 30 μm, the thickness of the PET layer used as the barrier core layer 10 is 240 to 250 μm, and the thickness of the heat sealing layer 12 is 20 to 30 μm.

[0041] In other embodiments, the recessed portion 100 penetrates the PETG outer layer 11 and the barrier core layer 10 and penetrates into the heat sealing layer 12 to a depth of 5% to 10% of the thickness of the heat sealing layer 12; for example, the barrier composite layer 1 is a laminated structure of PETG outer layer / APET layer / PET layer; wherein, considering the cost and ensuring the mechanical properties and barrier properties of the barrier composite layer, the thickness of the PETG outer layer 11 is 20 to 30 μm, the thickness of the APET layer used as the barrier core layer 10 is 20 to 30 μm, the PET layer is used as the heat sealing layer 12, and the thickness of the heat sealing layer 12 is 240 to 250 um.

[0042] Furthermore, the recessed portion 100 is filled with an antistatic coating. That is, the barrier composite layer 1 is prepared by co-extrusion, and then the recessed portion is formed by ultrasonic cutting, and then the antistatic coating 2 is coated on the first surface 101 and the second surface 102. The antistatic coating filled in the recessed portion 100 not only ensures the barrier performance of the protective film, but also ensures the mechanical properties under normal use to prevent rupture. The material of the antistatic coating 2 includes polythiophene conductive liquid. The setting of the antistatic coating 2 can quickly release or neutralize the static charge generated on the surface of the material, thereby avoiding the adsorption of dust, particles and other impurities due to static electricity, which is crucial for the electronics industry and other applications that require a clean working environment; when packaging electronic products, optical devices or other components that are sensitive to static electricity, the antistatic composite film can effectively reduce the damage caused by electrostatic discharge (ESD) to the internal components of the product; the PET composite film with antistatic properties can reduce the adhesion problem caused by static electricity during production, processing and transportation, and improve the production line operation speed and finished product quality; the antistatic composite film can provide additional safety protection and reduce safety hazards caused by static electricity.

[0043] In some embodiments, a flame retardant interlayer 13 is disposed between the PETG outer layer 11 and the barrier core layer 10 and between the barrier core layer 10 and the heat sealing layer 12 .

[0044] In some embodiments, a toughening interlayer 14 is disposed between the PETG outer layer 11 and the barrier core layer 10 and between the barrier core layer 10 and the heat-sealing layer 12 .

[0045] In some embodiments, a flame retardant interlayer 13 is disposed between the PETG outer layer 11 and the barrier core layer 10 , and a toughening interlayer 14 is disposed between the barrier core layer 10 and the heat sealing layer 12 .

[0046] In some embodiments, the PETG outer layer 11 is a flame retardant outer layer.

[0047] In some embodiments, the heat seal layer 12 is a flame retardant heat seal layer.

[0048] In some embodiments, the PETG outer layer 11 is a flame retardant outer layer, and the heat seal layer 12 is a flame retardant heat seal layer.

[0049] In some embodiments, the PETG outer layer 11 is a toughened outer layer.

[0050] In some embodiments, the heat seal layer 12 is a toughened heat seal layer.

[0051] In some embodiments, the PETG outer layer 11 is a flame retardant outer layer, and the heat seal layer 12 is a toughened heat seal layer.

[0052] In some embodiments, the barrier core layer 10 is a flame retardant core layer.

[0053] Among them, the materials of the toughened interlayer, toughened heat-sealing layer and toughened outer layer all include thermoplastic elastomers or rubber particle modified polyolefins; the materials of the flame-retardant interlayer, flame-retardant heat-sealing layer, flame-retardant outer layer and flame-retardant core layer include at least one flame retardant selected from antimony trioxide, magnesium hydroxide and aluminum hydroxide.

[0054] The packaging shell 3 for the battery is made of the above-mentioned packaging protective film for the battery, and the packaging shell 3 is provided with a receiving groove 30 for installing the battery, and the groove length extension direction of the receiving groove 30 is consistent with the first direction. The receiving groove 30 is set according to the number of batteries actually installed, and can be a single receiving groove 30, or it can be composed of two adjacent receiving grooves 30, or it can be composed of more than two adjacent receiving grooves 30. The packaging shell 3 composed of two or more receiving grooves 30, the adjacent receiving grooves 30 are arranged side by side along the second direction. The second direction is perpendicular to the first direction. The notch cover of the receiving groove 30 is provided with a sealing layer (not shown), and a sealing portion 31 is provided between the sealing layer and the heat sealing layer 12.

[0055] Example 1

[0056] like Figure 1 As shown, the battery packaging protective film includes a barrier composite layer 1 and an antistatic coating 2. The barrier composite layer 1 has a first surface 101 and a second surface 102 that are opposite to each other along the film thickness. The antistatic coating 2 is disposed on the first surface 101 and the second surface 102. The barrier composite layer 1 includes a PETG outer layer 11 and a heat-sealing layer 12, and the heat-sealing layer 12 is a PETG layer. The barrier composite layer 1 is provided with a recessed portion 100 on the surface of the PETG outer layer 11, and the recessed portions 100 extend along the first direction and are arranged at intervals along the second direction. A barrier core layer 10 is provided between the PETG outer layer 11 and the heat-sealing layer 12, and the barrier core layer 10 is a PET layer. The recessed portion 100 is arranged through the PETG outer layer 11 and penetrates into the barrier core layer 10 to a depth of 5% to 10% of the thickness of the barrier core layer 10. The thickness of the PETG outer layer 11 is 25 μm, the thickness of the PET layer used as the barrier core layer 10 is 240 μm, and the thickness of the heat sealing layer 12 is 25 μm. Among them, the barrier core layer 10 is a flame retardant core layer.

[0057] The battery packaging shell is made of the above-mentioned battery packaging protective film. The packaging shell 3 is provided with a receiving groove 30 for installing the battery. The groove length extension direction of the receiving groove 30 is consistent with the first direction. Two receiving grooves 30 are provided, and adjacent receiving grooves 30 are arranged in parallel along the second direction. The second direction is perpendicular to the first direction. The notch cover of the receiving groove 30 is provided with a sealing layer, and a sealing portion 31 is provided between the sealing layer and the heat sealing layer 12.

[0058] Example 2

[0059] like Figure 2As shown, Example 2 is based on Example 1, except that a barrier core layer 10 is provided between the PETG outer layer 11 and the heat sealing layer 12, the barrier core layer 10 is an APET layer, and the heat sealing layer 12 is a PET layer, and the recessed portion 100 is provided through the PETG outer layer 11 and the barrier core layer 10 and penetrates into the heat sealing layer 12 to a depth of 5% to 10% of the thickness of the heat sealing layer 12; that is, the barrier composite layer 1 is a laminated structure of PETG outer layer / APET layer / PET layer; the thickness of the PETG outer layer 11 is 25 μm, the thickness of the APET layer used as the barrier core layer 10 is 25 μm, and the thickness of the heat sealing layer 12 is 240 μm. Among them, the PETG outer layer 11 is a flame retardant outer layer, and the heat sealing layer 12 is a toughened heat sealing layer.

[0060] Example 3

[0061] like Figure 3 As shown, Example 3 is based on Example 1, except that a flame retardant interlayer 13 is provided between the PETG outer layer 11 and the barrier core layer 10, and a toughening interlayer 14 is provided between the barrier core layer 10 and the heat sealing layer 12. The heat sealing layer 12 is a flame retardant heat sealing layer, the thickness of the flame retardant interlayer 13 is 20 μm, and the thickness of the toughening interlayer 14 is 20 μm.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A packaging protective film for a storage battery, characterized in that: include, A barrier composite layer (1) having a first surface (101) and a second surface (102) opposite to each other along the film thickness; An antistatic coating (2) is disposed on the first surface (101) and the second surface (102); The barrier composite layer (1) comprises a PETG outer layer (11) and a heat-sealing layer (12), wherein the heat-sealing layer (12) is one of an APET layer, a PETG layer and a PET layer; The barrier composite layer (1) is provided with recessed portions (100) on the surface of the PETG outer layer (11); the recessed portions (100) extend along a first direction and are arranged at intervals along a second direction.

2. The battery packaging protective film according to claim 1, characterized in that: A barrier core layer (10) is arranged between the PETG outer layer (11) and the heat-sealing layer (12), and the barrier core layer (10) is an APET layer or a PET layer.

3. The battery packaging protective film according to claim 2, characterized in that: The recessed portion (100) is provided through the PETG outer layer (11) and penetrates into the barrier core layer (10) to a depth of 5% to 10% of the thickness of the barrier core layer (10); or the recessed portion (100) is provided through the PETG outer layer (11) and the barrier core layer (10) and penetrates into the heat sealing layer (12) to a depth of 5% to 10% of the thickness of the heat sealing layer (12).

4. The battery packaging protective film according to claim 1 or 3, characterized in that: The recessed portion (100) is filled with the antistatic coating (2).

5. The packaging protective film for a storage battery according to claim 2, characterized in that: A flame retardant interlayer (13) and / or a toughening interlayer (14) is provided between the PETG outer layer (11) and the barrier core layer (10) and between the barrier core layer (10) and the heat sealing layer (12).

6. The battery packaging protective film according to claim 2 or 5, characterized in that: The PETG outer layer (11) is a flame retardant outer layer or a toughened outer layer; the heat sealing layer (12) is a flame retardant heat sealing layer or a toughened heat sealing layer.

7. The packaging protective film for a storage battery according to claim 2 or 5, characterized in that: The barrier core layer (10) is a flame retardant core layer.

8. The battery packaging protective film according to claim 3, characterized in that: The thickness of the PETG outer layer (11) accounts for 5% to 10% of the total thickness of the barrier composite layer (1), the thickness of the barrier composite layer (1) is 250 to 320 μm, and the thickness of the antistatic coating (2) is 1 to 3 μm.

9. A battery packaging shell, characterized in that: The packaging shell (3) is made of the packaging protective film for the battery according to any one of claims 1 to 8, and the packaging shell (3) is provided with a receiving groove (30) for installing the battery, and the groove length extension direction of the receiving groove (30) is consistent with the first direction.

10. The battery packaging case according to claim 9, characterized in that: The slot cover of the receiving slot (30) is provided with a sealing layer, and a sealing portion (31) is provided between the sealing layer and the heat sealing layer (12).

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