Method for manufacturing a protective film and a battery case

Abstract

The application discloses a manufacturing method of a protective film and a battery shell. The protective film is used for being attached to a shell of an electronic device. The manufacturing method comprises the following steps: dipping a fiber cloth with a set size in dipping material to obtain dipped cloth material; and hot-pressing the dipped cloth material to obtain the protective film. The protective film at least comprises ultra-high molecular polyethylene fibers and / or Kevlar fibers.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, specifically relating to a method for manufacturing a protective diaphragm and a battery casing. Background Technology

[0002] Batteries are important components in electronic devices. To prevent batteries from being damaged by impacts, they are usually installed in a protective casing.

[0003] Due to the trend towards thinner and lighter electronic devices, the battery casings are typically made of plastic. When an electronic device is dropped, the battery casing is easily punctured by foreign objects, which can damage the battery. Summary of the Invention

[0004] This application aims to provide a method for manufacturing a protective film and a battery casing, at least to solve the problem that the casing for installing batteries is easily damaged.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application disclose a method for manufacturing a protective film, which is used to cover the housing of an electronic device. The manufacturing method includes:

[0007] The fiber cloth of a set size is impregnated in the impregnating material to obtain the impregnated fabric;

[0008] The impregnated fabric is hot-pressed to form a protective film;

[0009] The protective film includes at least ultra-high molecular weight polyethylene fiber and / or Kevlar fiber.

[0010] Secondly, embodiments of this application provide a battery casing, comprising:

[0011] case;

[0012] A protective film is attached to a predetermined position on the housing. The protective film is used to protect the predetermined position. The protective film includes at least ultra-high molecular weight polyethylene fiber and / or Kevlar fiber.

[0013] Thirdly, embodiments of this application propose an electronic device, including:

[0014] Such as the battery casing in the second aspect.

[0015] In the embodiments of this application, a protective film is attached to the casing. The protective film can protect the casing. In the event of a drop of the electronic device, foreign objects are less likely to puncture the casing, thereby preventing damage to the battery. By assembling the battery casing of this embodiment on the electronic device, it is beneficial to reduce the battery damage rate.

[0016] Ultra-high molecular weight polyethylene (UHMWPE) fiber and Kevlar fiber have advantages such as high specific strength, strong abrasion resistance and strong corrosion resistance. Protective films made from UHMWPE fiber and / or Kevlar fiber have strong puncture resistance, enabling them to effectively protect the shell.

[0017] The puncture resistance of the battery casing is improved by attaching a protective film to the casing without changing the original structure and materials used in its manufacturing process, thus reducing the difficulty of processing the battery casing. Moreover, since the processing materials of the casing do not need to be changed, the battery casing can still maintain its thin and light characteristics.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is one of the schematic diagrams of a battery casing according to an embodiment of this application;

[0021] Figure 2 This is a second schematic diagram of a battery casing according to an embodiment of this application;

[0022] Figure 3 This is one of the schematic diagrams of a protective diaphragm according to an embodiment of this application;

[0023] Figure 4 This is a second schematic diagram of a protective diaphragm according to an embodiment of this application;

[0024] Figure 5 This is a third schematic diagram of the protective diaphragm according to an embodiment of this application;

[0025] Figure 6 This is a fourth schematic diagram of a protective film according to an embodiment of this application;

[0026] Figure 7 This is the fifth schematic diagram of the protective film according to an embodiment of this application;

[0027] Figure 8 A schematic diagram illustrating the puncture resistance of films made of various materials is shown.

[0028] Figure 9 A flowchart illustrating a method for manufacturing a protective film according to an embodiment of this application is shown.

[0029] Figure label:

[0030] 100 Housing, 200 Protective membrane, 210 Substrate fiber layer, 211 Mounting groove, 220 Protective fiber layer, 221 Protective part, 222 Substrate part. Detailed Implementation

[0031] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] The following is combined with Figures 1-9 This application describes a method for manufacturing a protective diaphragm, a battery casing, and an electronic device according to embodiments of the present application.

[0035] like Figure 9 As shown in the embodiments of this application, a method for manufacturing a protective film is proposed. The protective film is used to cover the casing of a battery case. The method for manufacturing the protective film includes:

[0036] Step 202: Impregnate the fiber cloth of a set size in the impregnation material to obtain the impregnated cloth;

[0037] Step 204: The impregnated fabric is hot-pressed to form a protective film;

[0038] The protective film includes at least ultra-high molecular weight polyethylene fiber and / or Kevlar fiber.

[0039] In electronic devices, the battery compartment is used to hold the battery, and the battery case can be fastened to the battery compartment to prevent the battery from falling out of the battery compartment.

[0040] A protective film is attached to the casing, which can protect the casing and prevent foreign objects from easily piercing it. In the event of a drop of the electronic device, foreign objects are less likely to pierce the casing, thereby preventing damage to the battery. By assembling the battery casing of this embodiment on the electronic device, it is beneficial to reduce the battery damage rate.

[0041] Ultra-high molecular weight polyethylene (UHMWPE) fiber and Kevlar fiber have advantages such as high specific strength, strong abrasion resistance and strong corrosion resistance. Protective films made from UHMWPE fiber and / or Kevlar fiber have strong puncture resistance, enabling them to effectively protect the shell.

[0042] The protective film can protect a predetermined location on the housing; for example, the predetermined location could be the position on the housing corresponding to the battery. In other embodiments, the protective film can also be applied to one side of the entire housing.

[0043] The puncture resistance of the battery casing is improved by attaching a protective film to the casing without changing the original structure and materials used in its manufacturing process, thus reducing the difficulty of processing the battery casing. Moreover, since the processing materials of the casing do not need to be changed, the battery casing can still maintain its thin and light characteristics.

[0044] The fiber cloth is impregnated to obtain impregnated fabric. The impregnation process makes it difficult for the fibers on the fiber cloth to separate. After the impregnated fabric is hot-pressed, a protective film is obtained. The hot-pressing process makes the impregnated fabric more compact. Then, the protective film can be cut to obtain a set shape. After the protective film is coated with adhesive, it can be attached to the shell.

[0045] In this embodiment, the protective film includes UPE (ultra-high molecular weight polyethylene fiber) fabric and epoxy resin as the impregnating material for illustrative purposes. The manufacturing process of the protective film is as follows: select UPE fiber fabric of a specific specification, impregnate it in epoxy resin to obtain an impregnating material, hot press the impregnating material, coat it with glue, cut it, and then attach it to the shell.

[0046] For example, step 1: impregnate a UPE fiber cloth with a thickness of 0.1 mm and a weight of 60 g / m2 with epoxy resin by wet roll-to-roll method to form a fiber cloth prepreg with a resin content RC value of 45%.

[0047] Step 2: Hot-press the prepreg at a temperature of 130℃ and a pressure of 35 kg / cm². 2The hot pressing time is 15 minutes. The above hot pressing can be performed on a single layer. In order to improve the production yield, a laminator is used to press multiple layers at the same time. The single layers of UPE are separated by release paper and steel plate. The release paper is combined with UPE prepreg. The release paper is separated by steel plate. The thickness of the film after hot pressing is 0.1±0.02mm.

[0048] Step 3: Coat the hot-pressed diaphragm with adhesive.

[0049] Step 4: Cut the hot-pressed film with a round die to form a film material with an adhesive side.

[0050] The above impregnation can also be done by dry impregnation, which involves hot-pressing the resin film and the fiber cloth together. The resin used can have hot-press fluidity below 130°C to achieve impregnation of the fabric.

[0051] The thickness of the above-mentioned membrane can be adjusted by the resin content and pressure. The cutting method of the above-mentioned membrane can be ultraviolet laser cutting, metal die cutting, circular die cutting and carbon dioxide laser cutting, etc. In order to control the edge step difference, it is recommended to use circular die cutting and metal die cutting.

[0052] Step 5: Attach the UPE membrane to the parts of the housing that require puncture and impact resistance using acrylic double-sided adhesive.

[0053] UPE fiber cloth can be flexibly applied to areas of the shell where the protective performance needs to be improved, while avoiding the problem of the difficulty in processing one-piece UPE fiber shells.

[0054] In one possible embodiment, the impregnated fabric includes a first fabric and a second fabric, the second fabric having an installation groove; before hot-pressing the impregnated fabric to obtain the protective film, the method further includes: embedding the first fabric into the installation groove; wherein the protective film includes a substrate fiber layer and a protective fiber layer, the first fabric is hot-pressed to obtain the protective fiber layer, and the second fabric is hot-pressed to obtain the substrate fiber layer.

[0055] Ultra-high molecular weight polyethylene (UHMWPE) fibers and Kevlar fibers have high specific strength and strong abrasion resistance, making them difficult to cut. If protective films are formed solely from UHMWPE fibers and / or Kevlar fibers, the films are difficult to cut, resulting in challenges in neat processing and precise shaping.

[0056] A protective fiber layer is placed within the mounting groove of the substrate fiber layer. This protective fiber layer comprises ultra-high molecular weight polyethylene fibers and / or Kevlar fibers, thus possessing high specific strength and strong abrasion resistance, ensuring the protective performance of the diaphragm. The substrate fiber layer can be made of easily cut materials, such as glass fiber. The substrate fiber layer can be neatly processed, and using it as the outer edge structure of the protective diaphragm allows for precise fabrication into specific shapes, improving the compatibility between the diaphragm and the housing.

[0057] The protective fiber layer is embedded into the substrate fiber layer, so that one side of the protective fiber layer is flush with one side of the substrate fiber layer, ensuring the contact stability between the protective film and the shell.

[0058] For example, step 1: impregnate a UPE fiber cloth with a thickness of 0.1 mm and a weight of 60 g / m2 with epoxy resin by wet roll-to-roll method to form a fiber cloth prepreg with a resin content RC value of 55%.

[0059] Step 2: Impregnate a 0.1mm thick glass fiber cloth with epoxy resin using a wet roll-to-roll method to form a fiber cloth prepreg with a resin content (RC value) of 52%.

[0060] Step 3: Cut the UPE prepreg and glass fiber prepreg according to the preset structure.

[0061] Step 4: Stack the layers according to the preset thickness, such as... Figure 3 As shown, the UPE fiber layer is embedded within the same layer of glass fiber, and placed together on the surface of the shell. The remaining fiber layers are then stacked in a predetermined order. Its characteristics are as follows: Figure 4 The diagram shows a plan view of the UPE fiber layer and the glass fiber layer, where the UPE fiber layer and the glass fiber layer are on the same stack, with the UPE fibers embedded in the pre-designed gaps in the glass fiber layer. Because UPE fibers are difficult to process directly with machine tools, and laser cutting cannot meet the machining accuracy requirements of the 3D corner positions of the shell, this embedding method solves the problem of shape machining.

[0062] Step 5: Place the prepreg stack in a pre-set hot press mold for hot pressing at a temperature of 130°C for 6 minutes.

[0063] The above-mentioned hot pressing process uses a hot press machine, but a hot autoclave bag pressing process can also be used.

[0064] Step 6: Machine the product shape according to the preset dimensions.

[0065] In addition to machine tool processing, the cutting of the above-mentioned product shape can be carried out by laser cutting or punching process.

[0066] Step 7: Treat the product surface and apply leather decoration.

[0067] The stacking order in step 4 above can be adjusted according to requirements.

[0068] The above post-processing includes, but is not limited to, processes such as veneer application, spraying, coating, and texturing. The product is characterized by using UPE composite material as the substrate under the decorative layer.

[0069] Steps 6 and 7 above can be adjusted according to requirements.

[0070] In one possible application, the above-mentioned fiber types, in addition to UPE fiber, include, but are not limited to, glass fiber, aramid fiber, basalt fiber, etc.

[0071] There should be at least one UPE fiber layer, and the number of UPE fiber layers can be increased according to the requirements of impact resistance and puncture resistance.

[0072] In one possible embodiment, the number of substrate fiber layers is at least one, and the protective fiber layer is disposed on one of the substrate fiber layers located on the side of the at least one substrate fiber layer.

[0073] Although the protective fiber layer has strong puncture resistance, when the thickness of the protective film is small, the protective film has poor deformation resistance. If the electronic device is dropped or impacted, the shell may deform, resulting in damage to the shell.

[0074] By increasing the thickness of the fiber layer of the substrate, the deformation resistance of the protective film is improved, thereby providing support for the shell, making the shell less prone to deformation and reducing the damage rate of the shell.

[0075] The protective fiber layer is bonded to the shell, with no gap between them, thus preventing other objects from damaging the shell through the gap and improving the protective effect of the protective membrane on the shell.

[0076] In one possible embodiment, the protective fiber layer includes a protective portion and a substrate portion, wherein the protective portion includes at least ultra-high molecular weight polyethylene fibers and / or Kevlar fibers, and the substrate portion is connected to the protective portion.

[0077] The protective fiber layer needs to be installed on the substrate fiber layer. In order to ensure that the protective fiber layer and the substrate fiber layer are not easily separated, the bonding force between the protective fiber layer and the substrate fiber layer needs to be improved.

[0078] The protective layer comprises ultra-high molecular weight polyethylene fibers and / or Kevlar fibers, giving it strong puncture resistance. Since the bonding strength between ultra-high molecular weight polyethylene fibers and Kevlar fibers and other fibers is generally weak, the protective layer is connected to the substrate fiber layer to stably set the protective fiber layer. This results in the protective fiber layer being formed by a mixture of the protective layer and the substrate fiber layer, which improves the bonding strength between them. The protective fiber layer and the substrate fiber layer are less likely to separate, thus enhancing the structural stability of the protective membrane.

[0079] To improve the interlayer bonding between the UPE fiber layer and adjacent fiber layers, and to optimize the flexural modulus of the product, the weaving of the UPE fiber layer fabric was optimized.

[0080] like Figure 5 As shown, in the above embodiments, both the warp and weft of the UPE fiber cloth are UPE fibers. In this embodiment, the UPE fiber layer is made of a blend of glass fiber and UPE fiber. The warp and weft of the fiber cloth are composed of a predetermined ratio of UPE fiber and glass fiber. Figure 6 As shown, UPE fiber bundles and glass fiber bundles are woven together in a 1:1 ratio in both the warp and weft threads. Figure 7 As shown, UPE fiber bundles and glass fiber bundles are woven together in a 2:1 ratio in both the warp and weft threads.

[0081] The proportion and arrangement of glass fiber and UPE fiber can be adjusted according to actual needs.

[0082] Depending on actual needs, the glass fiber blended with UPE fiber can be replaced with aramid fiber, liquid crystal fiber, basalt fiber, etc.

[0083] By using blended fiber fabrics to enhance interlayer bonding, there is no need to use coupling agents or other treatments.

[0084] In one possible embodiment, the protective portion and the substrate portion are stacked; or the protective portion and the substrate portion are cross-woven.

[0085] In one possible embodiment, the tensile modulus of ultra-high molecular weight polyethylene fibers and / or Kevlar fibers is greater than or equal to 800 cN / dtex.

[0086] When the tensile modulus is within the above range, the protective diaphragm has strong puncture resistance. The battery case equipped with the protective diaphragm is not easily punctured by foreign objects, reducing the damage rate of the battery case.

[0087] In one possible embodiment, the basis weight K1 of the ultra-high molecular weight polyethylene fiber and / or Kevlar fiber satisfies: 30 g / m² 2 ≤K1≤100g / m 2Preferably 60g / m 2 .

[0088] In one possible embodiment, the fineness K2 of the ultra-high molecular weight polyethylene fiber and / or Kevlar fiber satisfies: 60 denier ≤ K2 ≤ 200 denier, preferably 100 denier.

[0089] In one possible embodiment, the thickness W of the protective diaphragm satisfies: 0.05mm ≤ W ≤ 0.2mm.

[0090] When the thickness of the protective film is less than 0.05mm, its resistance to deformation is poor. If the electronic device is dropped or impacted, the casing may deform, leading to damage. When the thickness of the protective film is greater than 0.2mm, the film is too thick and heavy, making it difficult to meet the demand for thinner and lighter battery casings.

[0091] In this embodiment, the thickness of the protective film is limited to between 0.05 mm and 0.2 mm, preferably 0.1 mm. When the protective film is attached to the shell, it can improve the shell's resistance to deformation. Moreover, the thinness of the protective film meets the requirement of making the battery shell lighter and thinner.

[0092] In one possible embodiment, the hot pressing temperature T during the hot pressing of the impregnated fabric satisfies: T < 130°C; and / or the duration t of the hot pressing of the impregnated fabric satisfies: 3 min ≤ t ≤ 12 min.

[0093] In one possible embodiment, the impregnating material content (RC value) in the impregnated fabric satisfies: 35% ≤ RC ≤ 70%.

[0094] The RC value refers to the content of impregnating material, and the appropriate impregnating material content can be selected for different application scenarios.

[0095] In one possible embodiment, the flowability RF value of the impregnating material in the impregnated fabric satisfies: 6g / min≤RF≤15g / min.

[0096] Combination Figure 1 and Figure 2 As shown, a battery casing according to some embodiments of this application includes: a casing 100 and a protective film 200. The protective film 200 is attached to a predetermined position on the casing 100 and is used to protect the predetermined position. The protective film 200 includes at least ultra-high molecular weight polyethylene fiber and / or Kevlar fiber.

[0097] In electronic devices, the battery compartment is used to hold the battery, and the battery case can be fastened to the battery compartment to prevent the battery from falling out of the battery compartment.

[0098] A protective film 200 is attached to the housing 100. The protective film 200 can protect the housing 100. In the event of a drop of the electronic device, foreign objects are less likely to puncture the housing 100, thereby preventing damage to the battery. By assembling the battery case in this embodiment on the electronic device, it is beneficial to reduce the battery damage rate.

[0099] Both ultra-high molecular weight polyethylene fiber and Kevlar fiber have advantages such as high specific strength, strong wear resistance and strong corrosion resistance. The protective membrane 200 is made of ultra-high molecular weight polyethylene fiber and / or Kevlar fiber. The protective membrane 200 has strong puncture resistance, which enables the protective membrane 200 to effectively protect the shell 100.

[0100] The protective film 200 can protect a preset position on the housing 100. For example, the preset position can be the position on the housing 100 corresponding to the battery. In other embodiments, the protective film 200 can also be applied to one side of the entire housing 100.

[0101] The puncture resistance of the battery casing is improved by attaching a protective film 200 to the casing 100 without changing the original structure and processing materials of the casing 100, thus reducing the processing difficulty of the battery casing. Moreover, since the processing materials of the casing 100 do not need to be changed, the battery casing can still maintain its thin and light characteristics.

[0102] By attaching a protective film 200 to the housing 100, the requirements for thinness and lightness can be met, and the battery safety of electronic devices during drops can be significantly improved.

[0103] During the processing of the protective film 200, a fiber cloth of a set size is first selected. The fiber cloth is impregnated to obtain an impregnated fabric. After impregnation, the fibers on the fiber cloth are not easily separated. The impregnated fabric is hot-pressed to form the protective film 200. The hot-pressing process makes the impregnated fabric more compact. Then, the protective film 200 of a set shape can be obtained by cutting. After the protective film 200 is coated with adhesive, it can be attached to the shell 100.

[0104] The housing 100 may be, but is not limited to, glass, plastic sheet, and composite materials.

[0105] The puncture resistance of the above-mentioned protective diaphragm 200 was tested. Referring to the national standard GB / T 37841-2019, a 1.7mm flat indenter was used for the puncture resistance test, and the puncture resistance of commonly used diaphragm materials in smart terminals in related technologies was compared. Figure 8The diagram illustrates the puncture resistance of UPE (ultra-high molecular weight polyethylene) fiber, PI (polyimide), PET (polyethylene terephthalate), and aramid fiber. The values ​​in the diagram represent the maximum puncture resistance (N). Figure 8 It can be concluded that the puncture resistance of the protective membrane 200 in this embodiment is far superior to that of membranes made of other materials.

[0106] Combination Figure 3 and Figure 4 As shown, in one possible embodiment, the protective film 200 includes: a substrate fiber layer 210 and a protective fiber layer 220. The substrate fiber layer 210 is provided with a mounting groove 211. The protective fiber layer 220 is connected to the substrate fiber layer 210 and is located in the mounting groove 211. The protective fiber layer 220 includes at least ultra-high molecular weight polyethylene fiber and / or Kevlar fiber.

[0107] Ultra-high molecular weight polyethylene (UHMWPE) fibers and Kevlar fibers have high specific strength and strong abrasion resistance, making them difficult to cut. If the protective film 200 is formed solely from UHMWPE fibers and / or Kevlar fibers, the edges of the protective film 200 are difficult to process neatly due to the difficulty in cutting it, making it difficult to precisely process the protective film 200 into a specific shape.

[0108] A protective fiber layer 220 is disposed within the mounting groove 211 of the substrate fiber layer 210. The protective fiber layer 220 comprises ultra-high molecular weight polyethylene fibers and / or Kevlar fibers, thus possessing high specific strength and strong abrasion resistance, ensuring the protective performance of the protective diaphragm 200. The substrate fiber layer 210 can be made of easily cut materials, such as glass fiber. The substrate fiber layer 210 can be neatly processed. Using the substrate fiber layer 210 as the outer edge structure of the protective diaphragm 200 allows the protective diaphragm 200 to be precisely processed into a specific shape, which improves the adaptability of the protective diaphragm 200 to the housing 100.

[0109] The protective fiber layer 220 is embedded into the substrate fiber layer 210, so that one side of the protective fiber layer 220 is flush with one side of the substrate fiber layer 210, thus ensuring the contact stability between the protective film 200 and the shell 100.

[0110] The material of the substrate fiber layer 210 includes, but is not limited to, the following materials: glass, composite board, plastic injection molded parts, ceramics, and composite materials.

[0111] like Figure 3As shown, in one possible embodiment, the substrate fiber layer 210 has at least one layer, and the protective fiber layer 220 is disposed on one of the substrate fiber layers 210 located on the side of the at least one substrate fiber layer 210, and the protective fiber layer 220 is attached to the housing 100.

[0112] Although the protective fiber layer 220 has strong puncture resistance, when the thickness of the protective diaphragm 200 is small, the protective diaphragm 200 has poor deformation resistance. In the event of an electronic device being dropped or impacted, the housing 100 may deform, resulting in damage to the housing 100.

[0113] By increasing the thickness of the substrate fiber layer 210, the deformation resistance of the protective film 200 is improved, thereby providing support for the shell 100. The shell 100 is less prone to deformation, reducing the damage rate of the shell 100.

[0114] The protective fiber layer 220 is bonded to the housing 100, and there is no gap between the protective fiber layer 220 and the housing 100, thereby preventing other objects from damaging the housing 100 through the gap between the protective fiber layer 220 and the housing 100, and improving the protective effect of the protective membrane 200 on the housing 100.

[0115] like Figure 6 As shown, in one possible embodiment, the protective fiber layer 220 includes a protective portion 221 and a substrate portion 222. The protective portion 221 includes at least ultra-high molecular weight polyethylene fibers and / or Kevlar fibers, and the substrate portion 222 is connected to the protective portion 221.

[0116] The protective fiber layer 220 needs to be installed on the substrate fiber layer 210. In order to ensure that the protective fiber layer 220 and the substrate fiber layer 210 are not easily separated from each other, it is necessary to improve the bonding force between the protective fiber layer 220 and the substrate fiber layer 210.

[0117] The protective part 221 includes ultra-high molecular weight polyethylene fibers and / or Kevlar fibers, giving it strong puncture resistance. Since the bonding strength between ultra-high molecular weight polyethylene fibers and Kevlar fibers and other fibers is generally weak, the protective part 221 is connected to the substrate part 222 to stably position the protective fiber layer 220 on the substrate fiber layer 210. This results in the protective fiber layer 220 being formed by mixing the protective part 221 and the substrate part 222, which improves the bonding strength between the protective fiber layer 220 and the substrate fiber layer 210. The protective fiber layer 220 and the substrate fiber layer 210 are less likely to separate, which helps improve the structural stability of the protective membrane 200.

[0118] In one possible embodiment, the protective portion 221 and the substrate portion 222 are stacked; or the protective portion 221 and the substrate portion 222 are cross-woven.

[0119] The protective part 221 and the substrate part 222 are arranged in a stacked manner. For example, the protective part 221 and the substrate part 222 are multiple layers. There is a substrate part 222 between two adjacent layers of protective part 221 and a protective part 221 between two adjacent layers of substrate part 222. The protective part 221 and the substrate part 222 are stacked. The outermost layer of the protective fiber layer 220 is set as the substrate part 222. This can ensure that the protective fiber layer 220 has strong puncture resistance and improve the bonding stability between the protective fiber layer 220 and the substrate fiber layer 210.

[0120] Combination Figure 6 and Figure 7 As shown, the protective part 221 and the base material part 222 can be combined by weaving to improve the connection stability of the protective part 221 and the base material part 222.

[0121] In one possible embodiment, the tensile modulus of ultra-high molecular weight polyethylene fibers and / or Kevlar fibers is greater than or equal to 800 cN / dtex.

[0122] When the tensile modulus is within the above range, the protective diaphragm 200 has strong puncture resistance. The battery case equipped with the protective diaphragm 200 is not easily punctured by foreign objects, reducing the damage rate of the battery case.

[0123] In one possible embodiment, the basis weight K1 of the ultra-high molecular weight polyethylene fiber and / or Kevlar fiber satisfies: 30 g / m² 2 ≤K1≤100g / m 2 .

[0124] In one possible embodiment, the fineness K2 of the ultra-high molecular weight polyethylene fiber and / or Kevlar fiber satisfies: 60 denier ≤ K2 ≤ 200 denier.

[0125] In one possible embodiment, the thickness W of the protective diaphragm 200 satisfies: 0.05mm ≤ W ≤ 0.2mm.

[0126] When the thickness of the protective film 200 is less than 0.05 mm, its resistance to deformation is poor. If the electronic device is dropped or impacted, the housing 100 may deform, leading to damage. When the thickness of the protective film 200 is greater than 0.2 mm, it is too thick and heavy, making it difficult to meet the requirement for a thinner battery housing.

[0127] In this embodiment, the thickness of the protective film 200 is limited to between 0.05 mm and 0.2 mm. When the protective film 200 is attached to the housing 100, it can improve the deformation resistance of the housing 100. Moreover, the thickness of the protective film 200 is small, which meets the requirement of making the battery housing thinner and lighter.

[0128] In the embodiments of this application, an electronic device is proposed, which includes a battery case as described in any of the above embodiments and can achieve the same technical effect, and will not be described again here.

[0129] In one possible application, the electronic device includes any of the following: mobile phone, tablet computer, or laptop computer.

[0130] In order to flexibly apply UPE fiber hot-pressed films on a variety of substrates, this embodiment uses a single-layer hot-pressed film to be bonded to the battery case with double-sided adhesive, hot melt adhesive or epoxy resin, instead of using coupling agent treatment and hot pressing.

[0131] This embodiment does not require an intermediate coupling layer; the different fiber layers are directly hot-pressed. This is because the fabric and resin have been adjusted.

[0132] Regarding the specifications of the UPE fiber layer, this embodiment proposes that in order to solve the interlayer bonding force and improve the rigidity of the shell, the pure UPE fiber layer can be replaced with a fiber layer that is a blend of UPE fiber and glass fiber.

[0133] Different specifications of UPE fibers have different properties for different application scenarios. In this embodiment, the fiber properties are defined as mechanical properties, not thermal properties.

[0134] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0135] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for manufacturing a protective diaphragm, characterized in that, The protective film is used to cover the housing of an electronic device, and the manufacturing method includes: The fiber cloth of a set size is impregnated in the impregnation material to obtain the impregnated cloth; The impregnated fabric is hot-pressed to form the protective film. The protective film includes at least ultra-high molecular weight polyethylene fiber and / or Kevlar fiber; The impregnated fabric includes a first fabric and a second fabric, wherein the second fabric is provided with an installation groove; Before the process of hot-pressing the impregnated fabric to obtain the protective film, the method further includes: Embed the first fabric into the mounting groove; The protective film includes a substrate fiber layer and a protective fiber layer. The first fabric is hot-pressed to obtain the protective fiber layer, and the second fabric is hot-pressed to obtain the substrate fiber layer. The protective fiber layer includes the ultra-high molecular weight polyethylene fiber and / or the Kevlar fiber, and the substrate fiber layer includes glass fiber.

2. The manufacturing method according to claim 1, characterized in that, The number of layers of the substrate fiber layer is at least one, and the protective fiber layer is disposed on one of the substrate fiber layers located on the side of the at least one substrate fiber layer.

3. The manufacturing method according to claim 1, characterized in that, The protective fiber layer includes a protective portion and a substrate portion. The protective portion includes at least the ultra-high molecular weight polyethylene fiber and / or the Kevlar fiber. The substrate portion is connected to the protective portion.

4. The manufacturing method according to claim 3, characterized in that, The protective part and the substrate part are stacked; or the protective part and the substrate part are cross-woven.

5. The manufacturing method according to any one of claims 1 to 4, characterized in that, The tensile modulus of the ultra-high molecular weight polyethylene fiber and / or the Kevlar fiber is greater than or equal to 800 cN / dtex.

6. The manufacturing method according to any one of claims 1 to 4, characterized in that, The fineness K1 of the ultra-high molecular weight polyethylene fiber and / or the Kevlar fiber satisfies: 30 g / m² 2 ≤K1≤100g / m 2 .

7. The manufacturing method according to any one of claims 1 to 4, characterized in that, The thickness W of the protective film satisfies: 0.05mm≤W≤0.2mm.

8. The manufacturing method according to any one of claims 1 to 4, characterized in that, The hot pressing temperature T during the hot pressing of the impregnated fabric satisfies: T < 130℃; and / or the duration t of the hot pressing of the impregnated fabric satisfies: 3min ≤ t ≤ 12min.

9. A battery casing, characterized in that, include: case; A protective film is attached to a predetermined position on the housing. The protective film is used to protect the predetermined position. The protective film includes at least ultra-high molecular weight polyethylene fiber and / or Kevlar fiber. The protective film includes a substrate fiber layer and a protective fiber layer. The substrate fiber layer has an installation groove, and the protective fiber layer is located in the installation groove. The protective fiber layer includes the ultra-high molecular weight polyethylene fiber and / or the Kevlar fiber, and the substrate fiber layer includes glass fiber.

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