Foam for packaging, preparation method thereof and battery package

Abstract

The invention discloses foam for packaging, a preparation method of the foam and a battery package, and relates to the technical field of packaging and transportation. The method comprises the steps that a negative pressure suction device is arranged on the first side of the foam, and a waterproof coating is arranged on the second side of the foam; and the negative pressure suction device is adopted to apply vacuum negative pressure to the foam, so that the waterproof coating moves from the second side of the foam to the first side of the foam and is diffused into pores of the foam. According to the foam for packaging, the preparation method of the foam and the battery package, the problem that in the prior art, residues fall off in foam for packaging can be solved, and the packaging effect of battery products is improved.

Description

Technical Field

[0001] The present application relates to the technical field of packaging and transportation, and in particular, to a foam for packaging, a preparation method thereof, and a battery packaging. Background Art

[0002] With the rapid development of new energy vehicles, the requirements for the safety performance of automotive batteries are also getting higher and higher. In the prior art, for individual battery cells and battery modules of automotive batteries, EPS (Expanded Polystyrene) foam is generally used for packaging to play a buffering role during transportation, thereby improving the safety of battery transportation. However, there is a situation where the packaging is prone to shedding slag, which affects product sales. Summary of the Invention

[0003] The purpose of the present application is to provide a foam for packaging, a preparation method thereof, and a battery packaging, which can solve the problem of slag shedding existing in the foam for packaging in the prior art and improve the packaging effect of battery products.

[0004] The embodiments of the present application are implemented as follows:

[0005] In the first aspect of the embodiments of the present application, a preparation method of a foam for packaging is provided. The method includes: setting a negative pressure suction device on the first side of the foam and setting a water-repellent coating on the second side of the foam; applying a vacuum negative pressure to the foam by using the negative pressure suction device, so that the water-repellent coating moves and diffuses from the second side of the foam to the first side of the foam and into the pores of the foam.

[0006] As an implementable manner, in the applying a vacuum negative pressure to the foam by using the negative pressure suction device, the negative pressure is 5×10 -5 MPa to 15×10 -5 MPa, and the pressure application duration is 3 s to 10 s.

[0007] As an implementable manner, the setting a negative pressure suction device on the first side of the foam and setting a water-repellent coating on the second side of the foam includes: setting a negative pressure suction device on the first side of the foam, and applying a vacuum negative pressure to the foam by using the negative pressure suction device to make the first side of the foam closely fit with the negative pressure suction device; setting the water-repellent coating on the second side of the foam by spraying.

[0008] As an implementable manner, in the applying a vacuum negative pressure to the foam by using the negative pressure suction device, the negative pressure is 1×10 -5 MPa to 3×10 -5 MPa.

[0009] As an implementable manner, disposing the water-repellent coating on the second side of the foam includes: disposing the water-repellent coating on the second side of the foam by spraying using a spray gun or a disc atomizer.

[0010] As an implementable manner, before disposing the negative pressure suction device on the first side of the foam and disposing the water-repellent coating on the second side of the foam, the method includes: pre-treating the surface of the foam to obtain a foam with a preset cleanliness.

[0011] As an implementable manner, after applying vacuum negative pressure to the foam using the negative pressure suction device, the method includes: irradiating the foam with ultraviolet light using an ultraviolet lamp, where the irradiation duration is 2 s to 5 s.

[0012] As an implementable manner, the first side of the foam is the side away from the battery terminal, and the second side of the foam is the side close to the battery terminal.

[0013] In the second aspect of the embodiments of the present application, a packaging foam is provided, which is prepared by using the preparation method of the above-mentioned packaging foam.

[0014] In the third aspect of the embodiments of the present application, a battery packaging is provided, including the above-mentioned packaging foam.

[0015] The beneficial effects of the embodiments of the present application include:

[0016] The method includes: arranging a negative pressure suction device on the first side of the foam and arranging a water-proof coating on the second side of the foam; applying a vacuum negative pressure to the foam by means of the negative pressure suction device, so that the water-proof coating moves and diffuses from the second side of the foam towards the first side of the foam into the pores of the foam. In the actual production and manufacturing process, by starting the negative pressure suction device to apply a vacuum negative pressure to the foam, this vacuum negative pressure will form a pressure difference inside the foam. Under the action of the pressure difference, the water-proof coating located on the second side of the foam is subjected to a "pulling force" towards the first side of the foam, and thus begins to move from the second side of the foam towards the first side of the foam. During the above movement process, due to the existence of pore structures in the foam itself, therefore, the water-proof coating will gradually diffuse along the direction of the pressure difference and thus enter the pores inside the foam. Compared with the prior art, through the preparation method of the packaging foam provided by this application, the prepared packaging foam can effectively isolate the powder residues generated by the foam itself by diffusing the water-proof coating into the pores of the foam through negative pressure suction, avoid the powder residues from falling during the packaging process, and thus significantly improve the packaging quality of the battery products. Since the problem of powder residue falling is solved, the appearance of the battery products is cleaner after packaging and will not be affected by the attachment of powder residues in terms of aesthetics and cleanliness. At the same time, it can also avoid potential damages that the powder residues may cause to the battery products, such as the risk of short circuit, etc., further ensuring the safety and stability of the battery products during transportation and storage and comprehensively improving the packaging effect of the battery products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can also be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is one of the flow diagrams of the preparation method of the packaging foam provided by the embodiments of this application;

[0019] Figure 2 It is the second flow diagram of the preparation method of the packaging foam provided by the embodiments of this application;

[0020] Figure 3 It is the third flow diagram of the preparation method of the packaging foam provided by the embodiments of this application;

[0021] Figure 4 It is the fourth flow diagram of the preparation method of the packaging foam provided by the embodiments of this application;

[0022] Figure 5 It is the fifth flow diagram of the preparation method of the packaging foam provided by the embodiments of this application;

[0023] Figure 6 This is a schematic structural diagram of the foam for packaging provided by the embodiments of the present application.

[0024] Icon: 10 - foam; 20 - negative pressure suction device; 30 - water - proof coating. Specific embodiments

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0029] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0030] In the description of the present application, it should also be noted that, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the connection inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] In the prior art, for a single battery cell and a battery module of an automotive battery, EPS foam is generally used for packaging to play a buffering role during transportation through the EPS foam, thereby improving the safety of battery transportation. However, since the existing EPS foam has the problem of easily dropping powder residues during packaging use, it affects the packaging effect of battery products and ultimately affects the sales of battery products.

[0032] To solve the above problems, please refer to Figures 1 to 6 , the present application provides a packaging foam 10, its preparation method, and a battery packaging. By providing a water-repellent coating 30 on the surface of the foam 10, and then using a negative pressure suction device 20 to make the water-repellent coating 30 diffuse from the surface of the foam 10 into the pores inside the foam 10, it is possible to isolate the powder residues existing in the foam 10 through the water-repellent coating 30, thereby improving the packaging effect of battery products.

[0033] Specifically, as Figures 1 to 6 shown, in the first aspect of the embodiment of the present application, a preparation method of a packaging foam 10 is provided, and the method includes:

[0034] S200. Set a negative pressure suction device 20 on the first side of the foam 10 and set a water-repellent coating 30 on the second side of the foam 10;

[0035] S300. Apply a vacuum negative pressure to the foam 10 using the negative pressure suction device 20 to make the water-repellent coating 30 move and diffuse from the second side of the foam 10 towards the first side of the foam 10 into the pores of the foam 10.

[0036] It should be noted that, first, the foam 10 to be processed is provided. Here, the foam 10 can be the above-mentioned EPS foam, or foams 10 of other materials, as long as it can be used for the packaging and transportation of products such as batteries, and there are pores (or microporous channels) inside the foam 10. Then, different components are respectively arranged on the opposite sides of the foam 10. Among them, a negative pressure suction device 20 is arranged on the first side of the foam 10 to generate a pressure environment lower than the normal atmospheric pressure through the negative pressure suction device 20 during the subsequent processing, so as to generate the required suction force on the foam 10 and the water-repellent coating 30. And a water-repellent coating 30 is arranged on the second side of the foam 10 to play a role in isolating the powder residue through the water-repellent coating 30. Next, the negative pressure suction device 20 is started to apply a vacuum negative pressure to the foam 10 by the negative pressure suction device 20. This vacuum negative pressure will form a pressure difference inside the foam 10. Under the action of the pressure difference, the water-repellent coating 30 located on the second side of the foam 10 is subjected to a "tensile force" towards the first side of the foam 10, and thus begins to move from the second side of the foam 10 towards the first side of the foam 10. During the above movement process, due to the pore structure existing in the foam 10 itself, therefore, the water-repellent coating 30 will gradually diffuse along the direction of the pressure difference and thus enter the pores inside the foam 10.

[0037] Compared with the prior art, through the preparation method of the packaging foam 10 provided by the present application, the prepared packaging foam 10 can diffuse the water-repellent coating 30 into the pores of the foam 10 through negative pressure suction, which can effectively isolate the powder residue generated by the foam 10 itself, avoid the powder residue from falling during the packaging process, and thus significantly improve the packaging quality of the battery products. Since the problem of powder residue falling is solved, the appearance of the battery products is cleaner after packaging and will not be affected by the adhesion of the powder residue in terms of aesthetics and cleanliness. At the same time, it can also avoid potential damages that the powder residue may cause to the battery products, such as the risk of short circuit, etc., further ensuring the safety and stability of the battery products during transportation and storage, and comprehensively improving the packaging effect of the battery products.

[0038] Exemplarily, as an implementable manner, the material of the above-mentioned water-repellent coating 30 can be any one of silicone coatings, polyurethane coatings, acrylate coatings or fluorocarbon coatings. Those skilled in the art should be able to make reasonable selections and designs according to the actual situation, and no specific limitations are made here.

[0039] Among them, taking silicone paint as an example, it has excellent water resistance, weather resistance, low surface energy and good flexibility. Its low surface energy makes it difficult for water to adhere to and penetrate its surface, which can effectively prevent moisture from entering the inside of the foam 10 and also prevent the powder residue of the foam 10 from leaking out. When the above-mentioned water-blocking paint 30 is silicone paint, it can maintain stable performance in different temperature environments, and is not easily affected by temperature changes in terms of water-blocking and powder residue prevention effects. Moreover, it has good adhesion to the foam 10, can firmly adhere to the surface and pores of the foam 10, and is not easily detached after long-term use.

[0040] Taking polyurethane paint as an example, it has good abrasion resistance, chemical resistance and waterproofness. Its waterproof performance stems from its dense molecular structure, which can form a continuous and well-sealed protective film on the surface and pores of the foam 10, effectively blocking moisture and powder residue. When the above-mentioned water-blocking paint 30 is polyurethane paint, the cured polyurethane paint has high strength and elasticity, can adapt to the deformation of the foam 10 during transportation and other processes, and will not crack due to slight extrusion or stretching of the foam 10, thus continuously maintaining the function of water-blocking and powder residue prevention.

[0041] Taking acrylate paint as an example, it has good water resistance, ultraviolet resistance and decorative properties. Its water-based products have good environmental protection performance, and can form a transparent and tough film on the surface of the foam 10, which can not only block water and powder residue, but also improve the appearance quality of the foam 10 to a certain extent. When the above-mentioned water-blocking paint 30 is acrylate paint, it has a fast drying speed, can quickly form a protective film, improve production efficiency. At the same time, it has good flexibility and impact resistance, and can still maintain good water-blocking and powder residue prevention effects when the foam 10 is subjected to a certain external force.

[0042] Taking fluorocarbon paint as an example, it has excellent water resistance, corrosion resistance and self-cleaning properties. Its extremely low surface tension makes it difficult for water, powder residue, etc. to adhere to the surface of the foam 10, and can effectively achieve the purpose of water-blocking and powder residue prevention. When the above-mentioned water-blocking paint 30 is fluorocarbon paint, it has an extremely long service life, and can maintain good performance for a long time even in harsh environments. For the foam 10 used in battery packaging that needs to be stored for a long time or transported in a complex environment, it is an ideal choice for the water-blocking paint 30.

[0043] As an implementable mode, in S300, a vacuum negative pressure is applied to the foam 10 by the negative pressure suction device 20, and the negative pressure is 5×10 -5 MPa~15×10 -5 MPa, and the pressure application duration is 3s~10s.

[0044] It should be noted that setting the negative pressure within the above range ensures that there is sufficient suction force for the water-repellent coating 30 on the second side of the foam 10 to overcome the resistance and smoothly diffuse from the surface of the foam 10 into the pores inside, while also preventing damage to the structure of the foam 10 due to excessive pressure and ensuring that the physical properties of the foam 10 are not impaired. And setting the pressure application duration within the above range can not only ensure that the water-repellent coating 30 has sufficient time to fully diffuse into the pores of the foam 10 under the action of negative pressure, so that all parts inside the foam 10 can be effectively protected, but also prevent energy waste caused by too long pressure application time or unnecessary wear on the foam 10 and other related equipment.

[0045] As an implementable mode, as Figure 2 shown, setting a negative pressure suction device 20 on the first side of the foam 10 and setting a water-repellent coating 30 on the second side of the foam 10 includes:

[0046] S210. Set a negative pressure suction device 20 on the first side of the foam 10, and apply a vacuum negative pressure to the foam 10 through the negative pressure suction device 20 to make the first side of the foam 10 closely fit with the negative pressure suction device 20;

[0047] It should be noted that, first of all, when a negative pressure suction device 20 is set on the first side of the foam 10 and the negative pressure suction device 20 is started, a vacuum negative pressure environment will be created on the first side of the foam 10. Due to the existence of negative pressure, a pressure difference will be generated between the first side of the foam 10 and the negative pressure suction device 20. Under the action of this pressure difference, the foam 10 will be tightly adsorbed on the negative pressure suction device 20, thus realizing the close fit between the first side of the foam 10 and the negative pressure suction device 20. This step lays the foundation for subsequent use of negative pressure to make the water-repellent coating 30 diffuse into the pores inside the foam 10 and ensures that the negative pressure can effectively act on the foam 10.

[0048] Specifically, by closely fitting the first side of the foam 10 with the negative pressure suction device 20, problems such as negative pressure leakage or uneven pressure caused by insufficient contact can be reduced, so that when negative pressure is applied subsequently to make the water-repellent coating 30 diffuse, a more stable and uniform pressure difference can be formed inside the foam 10. This helps the water-repellent coating 30 to diffuse more smoothly and evenly from the second side of the foam 10 to the first side of the foam 10 and penetrate into the pores, thereby improving the isolation effect on the foam 10 powder residue and ensuring the quality of the battery product packaging.

[0049] S220. Set the water-repellent coating 30 on the second side of the foam 10 by spraying.

[0050] It should be noted that, then, after the first side of the foam 10 is closely attached to the negative pressure suction device 20, a water-repellent coating 30 is provided on the second side opposite to the first side of the foam 10 by spraying. Spraying is a common and efficient material coating method. As an implementable way, S220, providing the water-repellent coating 30 on the second side of the foam 10 by spraying includes: S221, using a spray gun or a disc atomizer to provide the water-repellent coating 30 on the second side of the foam 10 by spraying. The water-repellent coating 30 is evenly atomized and sprayed onto the surface of the second side of the foam 10 through the spray gun or the disc atomizer, so that the water-repellent coating 30 can be more evenly covered on the second side of the foam 10, preparing for diffusion into the pores inside the foam 10 under negative pressure.

[0051] Specifically, providing the water-repellent coating 30 on the second side of the foam 10 by spraying can make the water-repellent coating 30 more evenly distributed on the surface of the second side of the foam 10. The uniform distribution of the water-repellent coating 30 is crucial for subsequent diffusion under negative pressure. If the water-repellent coating 30 is unevenly distributed on the surface of the foam 10, it may cause the water-repellent coating 30 in some areas to not fully diffuse into the pores of the foam 10 under negative pressure, while in some areas, there may be too much accumulation of the water-repellent coating 30. The uniform distribution of the water-repellent coating 30 can ensure that under the action of negative pressure suction, the pores in all parts of the foam 10 can be fully filled with the water-repellent coating 30, effectively improving the ability to isolate powder residues, and thus improving the battery packaging effect.

[0052] As an implementable way, S210, applying a vacuum negative pressure to the foam 10 through the negative pressure suction device 20, the negative pressure is 1×10 -5 MPa~3×10 -5 MPa.

[0053] It should be noted that setting the negative pressure within the above range can achieve a good fitting effect between the foam 10 and the negative pressure suction device 20 without damaging the foam 10. If the negative pressure is too small, the foam 10 may not be closely attached to the negative pressure suction device 20, resulting in uneven negative pressure and affecting the subsequent diffusion effect of the water-repellent coating 30; if the negative pressure is too large, it may damage the structure of the foam 10, such as deforming or breaking the pore structure of the foam 10, thereby reducing the buffering performance and physical strength of the foam 10 and affecting its use effect in battery packaging.

[0054] As an implementable way, as Figure 3 shown, S200, before providing the negative pressure suction device 20 on the first side of the foam 10 and providing the water-repellent coating 30 on the second side of the foam 10, the method includes:

[0055] S100. Pretreat the surface of the foam 10 to obtain a foam 10 with a preset cleanliness.

[0056] It should be noted that before subsequent operations such as setting the negative pressure suction device 20 and the water-repellent coating 30 on the foam 10, the surface of the foam 10 needs to be pretreated first, such as by wiping, rinsing, ultrasonic cleaning, etc., to remove various impurities, dust, oil stains or other contaminants that may exist on the surface of the foam 10, so as to obtain a foam 10 with a preset cleanliness. In this way, it can not only ensure that the contact between the foam 10 and the negative pressure suction device 20 is closer and more uniform, avoiding gaps or poor contact between the foam 10 and the negative pressure suction device 20, resulting in uneven distribution of negative pressure on the surface of the foam 10; but also enable the water-repellent coating 30 to be closely combined with the foam 10, improving the adhesion stability of the water-repellent coating 30 on the surface of the foam 10, ensuring that under the action of negative pressure, the water-repellent coating 30 can spread evenly and firmly adhere to the pores of the foam 10, effectively improving the water-repellent performance of the foam 10; in addition, it can also prevent impurities from mixing into the pores of the foam 10 or reacting with the water-repellent coating 30, thereby affecting the performance and quality of the product.

[0057] Under normal circumstances, some water-repellent coatings 30 need to be further dried and cured. As an implementable method, as Figure 4 and Figure 5 shown, after applying a vacuum negative pressure to the foam 10 by using the negative pressure suction device 20, the method includes: S400. Irradiate the foam 10 with ultraviolet light using an ultraviolet lamp, where the irradiation duration is 2 s to 5 s.

[0058] It should be noted that irradiating the foam 10 with ultraviolet light emitted by the ultraviolet lamp for a certain period of time can cause the water-repellent coating 30 on the second side of the foam 10 to undergo a photochemical reaction under the action of ultraviolet light and quickly cure and form. The cured water-repellent coating 30 can form a stable water-repellent barrier, improving the water-repellent performance of the foam 10, more effectively preventing the penetration of substances such as water and powder residue, and ensuring the protection effect of the foam 10 in applications such as battery packaging.

[0059] As an implementable method, the first side of the foam 10 is the side away from the pole of the battery, and the second side of the foam 10 is the side close to the pole of the battery. That is to say, the negative pressure suction device 20 is set on the side away from the pole of the battery, which can avoid possible mechanical damage such as collision and extrusion to the pole during the negative pressure operation; while the water-repellent coating 30 is set on the side close to the pole of the battery, which can effectively prevent water from entering the pole area, prevent the pole from getting damp and oxidized, ensure the conductivity and stability of the pole, and extend the service life of the battery.

[0060] As Figure 6As shown in the figure, in the second aspect of the embodiments of the present application, a foam 10 for packaging is provided, which is prepared by using the above-mentioned preparation method of the foam 10 for packaging.

[0061] It should be noted that for the parts where the specific structure of the foam 10 for packaging provided in this embodiment is the same as that of the preparation method of the foam 10 for packaging in the previous text, those skilled in the art can infer the specific structure of the foam 10 for packaging according to the description of the preparation method of the foam 10 for packaging in the previous text, and the present application will not repeat the description. Since the foam 10 for packaging provided in this embodiment is prepared by using the above-mentioned preparation method of the foam 10 for packaging, therefore, the foam 10 for packaging has the same beneficial effects as the above-mentioned preparation method of the foam 10 for packaging, which will not be elaborated here either.

[0062] In the third aspect of the embodiments of the present application, a battery package is provided, and the battery package includes the above-mentioned foam 10 for packaging. Since the structure and beneficial effects of the foam 10 for packaging have been described in detail in the foregoing embodiments, they will not be elaborated here.

[0063] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

[0064] In addition, it should be noted that for each of the specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present application will not separately describe various possible combination methods.

Claims

1. A method for preparing packaging foam, characterized in that: The method comprises: A negative pressure suction device is provided on a first side of the foam and a water-proof coating is provided on a second side of the foam; The negative pressure suction device is used to apply vacuum negative pressure to the foam, so that the water-proof coating moves from the second side of the foam toward the first side of the foam and diffuses into the pores of the foam.

2. The method for preparing packaging foam according to claim 1, characterized in that: The negative pressure suction device is used to apply vacuum negative pressure to the foam, and the negative pressure is 5×10 -5 MPa~15×10 -5 MPa, and the pressure application time is 3s to 10s.

3. The method for preparing packaging foam according to claim 1, characterized in that: The method of providing a negative pressure suction device on the first side of the foam and providing a water-proof coating on the second side of the foam comprises: A negative pressure suction device is arranged on the first side of the foam, and a vacuum negative pressure is applied to the foam through the negative pressure suction device, so that the first side of the foam is closely fitted with the negative pressure suction device; A water-repellent coating is applied on the second side of the foam by spraying.

4. The method for preparing packaging foam according to claim 2, characterized in that: The negative pressure suction device applies vacuum negative pressure to the foam, and the negative pressure is 1×10 -5 MPa~3×10 -5 MPa.

5. The method for preparing packaging foam according to claim 2, characterized in that: The step of providing a water-proof coating on the second side of the foam by spraying comprises: The water-repellent coating is applied by spraying on the second side of the foam using a spray gun or a disc atomizer.

6. The method for preparing packaging foam according to claim 1, characterized in that: Before the negative pressure suction device is provided on the first side of the foam and the waterproof coating is provided on the second side of the foam, the method comprises: The surface of the foam is pre-treated to obtain the foam with a preset cleanliness.

7. The method for preparing packaging foam according to claim 1 or 6, characterized in that: After the negative pressure suction device is used to apply vacuum negative pressure to the foam, the method comprises: The foam is irradiated with ultraviolet light by using an ultraviolet lamp, wherein the irradiation time is 2s to 5s.

8. The method for preparing packaging foam according to claim 1, characterized in that: The first side of the foam is a side away from the pole of the battery, and the second side of the foam is a side close to the pole of the battery.

9. A packaging foam, characterized in that: The foam is prepared by the method for preparing packaging foam according to any one of claims 1 to 8.

10. A battery package, characterized in that: The packaging foam according to claim 9 is included.

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