Aluminum plastic film capable of preventing packaging heat radiation, polymer lithium ion battery and pit punching device

Abstract

The utility model relates to the technical field of batteries, and discloses an aluminum-plastic film capable of preventing packaging heat radiation, a polymer lithium ion battery and a pit punching device, the depth and the width of a first pit punching formed in an aluminum-plastic film body through punching are increased, so that a gap generated between an upper aluminum-plastic film and a lower aluminum-plastic film of an air bag formed after packaging is relatively large, and the packaging heat radiation is prevented. Therefore, the problem that the CPP adhesive layer is dissolved due to heat conduction of the aluminum layer in the aluminum-plastic film can be solved or improved, injection of electrolyte is facilitated, and the aluminum-plastic film is suitable for large-scale popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an aluminum-plastic film that can prevent heat radiation from the encapsulation, a polymer lithium-ion battery, and a dent-removing device. Background Art

[0002] In the production process of polymer lithium-ion batteries, a key design feature is the use of aluminum-plastic film to create a carefully constructed airbag-like structure through stamping technology. The main function of this airbag structure is to effectively store and contain the electrolyte after injection. Therefore, ensuring the integrity of this airbag structure is crucial in the final packaging design stage of the product.

[0003] Regarding the crucial process of flexible encapsulation, its parameter settings have been meticulously considered: the temperature of the upper end cap is strictly controlled within the range of 185±5℃, while the temperature of the lower end cap is set within the range of 285±5℃, and the duration of the entire encapsulation process is precisely set between 3.0 and 3.5 seconds. However, it is worth noting that due to the excellent thermal conductivity of the middle layer material of the aluminum-plastic film—the aluminum (AL) layer—this characteristic makes the sealing area prone to heat radiation after the airbag is formed, causing the CPP adhesive layer to dissolve. Consequently, the reserved airbag opening is sealed during the encapsulation process, causing problems for the subsequent electrolyte injection stage: the suction cup of the injection machine has difficulty opening the sealed airbag opening smoothly, leading to problems such as inability to inject electrolyte or difficulty in injection.

[0004] Therefore, improvements to existing technologies are necessary.

[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0006] This invention provides an aluminum-plastic film, a polymer lithium-ion battery, and a dent-removing device to prevent heat radiation from the encapsulation process, thereby solving the problems existing in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] In a first aspect, this utility model provides an aluminum-plastic film that can prevent heat radiation from encapsulation, comprising an aluminum-plastic film body and a first perforation; wherein...

[0009] The first perforation is used to form an airbag for storing electrolyte after the aluminum-plastic film body is encapsulated.

[0010] The first dent is formed by stamping from one surface of the aluminum-plastic film body to the other surface;

[0011] The depth of the first crater is greater than 4 mm;

[0012] The formula for calculating the width of the first crater is:

[0013] W3 = W1 - 2 * W2;

[0014] Wherein, W3 is the width of the first perforation, W1 is the width of the aluminum-plastic film body, and W2 is the width of the sealing edge.

[0015] Furthermore, in the aluminum-plastic film that prevents heat radiation from the encapsulation, the depth of the first perforation is 4-6 mm.

[0016] Furthermore, in the aluminum-plastic film that prevents heat radiation from the packaging, the bottom surface of the first perforation is inclined from high to low from one side to the opposite side.

[0017] Furthermore, the aluminum-plastic film that prevents heat radiation from the encapsulation also includes a second perforation and a third perforation;

[0018] The second and third perforations are used together to form a cavity for accommodating the battery cell after the aluminum-plastic film body is packaged.

[0019] In a second aspect, this utility model provides a polymer lithium-ion battery, including a cell, an electrolyte, and an aluminum-plastic film as provided in the first aspect above that can prevent encapsulation heat radiation.

[0020] The battery cell is housed in the aluminum-plastic film body;

[0021] The electrolyte is stored in an airbag formed by the first punch after the aluminum-plastic film body is sealed.

[0022] Thirdly, this utility model provides a punching device for preparing an aluminum-plastic film as described in the first aspect above, which can prevent heat radiation from the packaging. The device includes an upper template, a lower template, and a punching mold core.

[0023] The upper template and the lower template are respectively disposed on two opposite surfaces of the aluminum-plastic film body to clamp the aluminum-plastic film body;

[0024] The punching die core is directly facing the area on the aluminum-plastic film body where the first punching hole needs to be punched out;

[0025] The formula for calculating the width of the stamping surface of the punching die core is as follows:

[0026] W3 = W1 - 2 * W2;

[0027] Wherein, W3 is the width of the first perforation, W1 is the width of the aluminum-plastic film body, and W2 is the width of the sealing edge;

[0028] The stamping depth of the punching die core is greater than 4mm.

[0029] Furthermore, in the punching device, the punching surface of the punching die core is inclined from high to low from one side to the opposite side.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This utility model provides an aluminum-plastic film, a polymer lithium-ion battery, and a punching device that can prevent heat radiation during packaging. By increasing the depth and width of the first punch formed on the aluminum-plastic film body, the gap between the upper and lower aluminum-plastic films of the airbag formed after packaging is larger. This solves or improves the problem of CPP adhesive layer miscibility caused by thermal conductivity of the aluminum layer in the aluminum-plastic film, which is beneficial for electrolyte injection and suitable for widespread application.

[0032] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of an aluminum-plastic film with small perforations formed by stamping in the prior art;

[0035] Figure 2 This is a schematic diagram of the structure of an aluminum-plastic film that can prevent heat radiation during encapsulation, provided in Embodiment 1 of this utility model;

[0036] Figure 3 This is a schematic diagram of the structure of a small-sized punching die core in the existing technology;

[0037] Figure 4 This is a schematic diagram of the punching die core provided in Embodiment 3 of this utility model.

[0038] Figure label:

[0039] 1. Aluminum-plastic film body, 2. First punch, 3. Second punch, 4. Third punch, 5. Punch mold core. Detailed Implementation

[0040] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0041] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0042] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0043] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0044] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0045] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0046] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0047] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] Example 1

[0050] In view of the deficiencies in the existing technology, the applicant, based on years of practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theoretical principles, has actively conducted research and innovation in order to create a technology that can solve the deficiencies in the existing technology. After continuous research, design, and repeated prototype production and improvement, this utility model with practical value has finally been created.

[0051] like Figure 1 As shown, the aluminum-plastic film stamping process in the prior art forms small dents. The depth of these dents is generally less than or equal to 4mm, and their width is much smaller than that of the aluminum-plastic film. This results in a gap that is too small, or even almost nonexistent, between the upper and lower aluminum-plastic films of the airbag after encapsulation, making it impossible to prevent the airbag opening from closing due to the thermal radiation effect.

[0052] To solve this problem, please refer to... Figure 2 This utility model provides an aluminum-plastic film that can prevent heat radiation from encapsulation, comprising an aluminum-plastic film body 1 and a first perforation 2; wherein,

[0053] The first perforation 2 plays a crucial role after the aluminum-plastic film body 1 is encapsulated, forming an air pocket space for storing the electrolyte. This design not only optimizes the encapsulation structure but also ensures the stability and safety of electrolyte storage.

[0054] The first perforation 2 is formed by a precision stamping process, from one side of the aluminum-plastic film body 1 to the other side. This stamping process ensures the stability and consistency of the perforation structure.

[0055] Most importantly, in this embodiment, the depth of the first perforation 2 is set to be greater than 4mm, which is an increase in the perforation depth design compared to the prior art. This depth design not only increases the gap between the upper and lower aluminum-plastic films of the airbag formed after packaging, thereby solving or improving the problem of CPP adhesive layer miscibility caused by thermal conductivity of aluminum layer in aluminum-plastic film, but also significantly enhances the volume and electrolyte storage capacity of airbag, and provides a more spacious environment for subsequent electrolyte injection.

[0056] Furthermore, the width of the first perforation 2 was also rigorously calculated, specifically using the formula: W3 = W1 - 2 * W2. Here, W3 represents the width of the first perforation 2, W1 is the width of the aluminum-plastic film body 1, and W2 represents the width of the sealing edge required during the encapsulation process. This calculation formula ensures a precise match between the perforation width and the dimensions of the aluminum-plastic film body 1 and the sealing edge, maximizing the perforation width. This represents an increase in perforation width compared to existing technologies. This further addresses or improves the problem of CPP adhesive layer miscibility due to the thermal conductivity of the aluminum layer in the aluminum-plastic film, and further enhances electrolyte storage capacity, thereby improving the overall stability of the encapsulation structure and the electrolyte storage efficiency.

[0057] In summary, this invention, by increasing the depth and width of the first perforation 2 on the aluminum-plastic film body 1, not only increases the internal space of the airbag formed after encapsulation, effectively solving the problem of CPP adhesive layer miscibility caused by the thermal conductivity of the aluminum layer in the aluminum-plastic film, but also significantly optimizes the electrolyte injection process, improving the overall performance and reliability of the encapsulation structure. Therefore, this invention has broad applicability and promotional value, and is of great significance for improving the quality and performance of related products.

[0058] In one embodiment of this example, the depth of the first crater 2 is 4-6 mm.

[0059] It should be noted that this depth range was chosen based on a comprehensive consideration of the stability of the packaging structure, electrolyte storage efficiency, and thermal radiation protection. Through in-depth research and experimental verification, this embodiment found that when the depth of the first perforation 2 is within this range, it not only effectively avoids the CPP adhesive layer miscibility problem caused by the thermal conductivity of the aluminum layer in the aluminum-plastic film, but also provides a more ideal spatial environment for electrolyte injection and storage. At the same time, this depth design also ensures the overall stability and reliability of the packaging structure, further improving the quality and performance of the product. Therefore, this depth selection is the optimal decision made in this embodiment after comprehensively considering various factors, aiming to provide users with a higher quality and more reliable product experience.

[0060] In one embodiment of this example, the bottom surface of the first ditch 2 is inclined from one side to the opposite side from high to low.

[0061] It should be noted that this unique design not only further enriches the functionality of the flushing pit, but also brings multiple advantages.

[0062] First, the sloping bottom surface prevents wrinkling at the edges of the stamped shell. Traditional flat stamping designs can cause stress concentration at the edges, especially with thinner materials or greater stamping depths. The sloping bottom surface disperses these stresses, distributing them more evenly across the entire bottom surface of the stamped shell, thus reducing stress concentration at the edges.

[0063] Secondly, the sloping bottom design helps optimize the distribution and flow of electrolyte within the airbag, allowing the electrolyte to cover the bottom of the crater more evenly, thereby improving electrolyte storage efficiency and battery performance.

[0064] Furthermore, the sloping bottom surface helps mitigate heat radiation during the encapsulation process. Because the aluminum layer in the aluminum-plastic film has excellent thermal conductivity, traditional flat perforation designs may generate localized heat radiation during encapsulation, leading to problems such as CPP adhesive layer miscibility. The sloping bottom surface design, however, can more effectively disperse and alleviate this heat radiation, thereby reducing its impact on the encapsulation structure and improving product stability and reliability.

[0065] In addition, the sloping bottom design provides a more flexible and convenient operating space for subsequent electrolyte injection and battery assembly, which helps to improve production efficiency and product quality.

[0066] In summary, the inclined bottom surface design of the first crater 2 in this embodiment not only reflects the continuous pursuit of product performance and quality in this embodiment, but also brings users a better and more reliable product experience.

[0067] In one embodiment of this invention, the aluminum-plastic film that prevents heat radiation from the encapsulation further includes a second perforation 3 and a third perforation 4.

[0068] The second perforation 3 and the third perforation 4 are used together to form a cavity for accommodating the battery cell after the aluminum-plastic film body 1 is packaged.

[0069] It should be noted that this design not only provides a stable and safe storage environment for the battery cells, but also optimizes the overall structure and performance of the battery through a reasonable spatial layout.

[0070] Similar to the first perforation 2, the second perforation 3 and the third perforation 4 are also formed on the aluminum-plastic film body 1 through a precision stamping process. They each have unique shapes and sizes to ensure that they can fit together tightly after encapsulation to form a complete and sealed cavity.

[0071] This cavity design not only meets the basic requirements for cell storage, but also improves the battery's energy density and safety through reasonable space allocation and shape optimization. Meanwhile, the addition of the second and third perforations (3 and 4) makes the entire aluminum-plastic film structure more complex and diverse, further enhancing the product's competitiveness and market adaptability.

[0072] Furthermore, the introduction of the second and third flushing pits (3 and 4) provides greater flexibility and convenience for subsequent battery assembly and electrolyte injection. They can be customized and adjusted according to actual needs to meet the requirements of different customers and application scenarios.

[0073] In summary, the second and third perforations 3 and 4 introduced in this embodiment not only enrich the functionality of the aluminum-plastic film but also enhance the overall performance and market competitiveness of the battery through reasonable spatial layout and shape optimization. This innovative design will bring users a higher quality and more reliable battery product experience.

[0074] Although this application frequently uses terms such as aluminum-plastic film body and first flushing pit, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0075] This utility model provides an aluminum-plastic film that can prevent heat radiation during packaging. By increasing the depth and width of the first perforation formed on the aluminum-plastic film body, the gap between the upper and lower aluminum-plastic films of the airbag formed after packaging is larger. This solves or improves the problem of CPP adhesive layer miscibility caused by thermal conductivity of the aluminum layer in the aluminum-plastic film, which is beneficial for electrolyte injection and suitable for widespread application.

[0076] Example 2

[0077] Embodiment 2 of this utility model provides a polymer lithium-ion battery, including a cell, an electrolyte, and an aluminum-plastic film as provided in Embodiment 1 above to prevent heat radiation from the encapsulation.

[0078] The battery cell is housed in the aluminum-plastic film body;

[0079] The electrolyte is stored in an airbag formed by the first punch after the aluminum-plastic film body is sealed.

[0080] It should be noted that the battery cell, as the core component of the battery, is responsible for storing and releasing electrical energy. In this embodiment, the battery cell is carefully housed within an aluminum-plastic film body. This design not only ensures the stability and safety of the battery cell but also provides it with a good working environment.

[0081] Electrolyte is an indispensable component of a battery, responsible for transferring ions between cells to achieve the conversion and storage of electrical energy. In this embodiment, the electrolyte is cleverly stored within an air pocket formed by the first perforation after the aluminum-plastic film body is encapsulated. This design not only optimizes the storage and distribution of the electrolyte but also improves the battery's energy density and performance.

[0082] As described in Embodiment 1 above, the aluminum-plastic film adopts a unique first perforation structure design, which effectively prevents heat radiation problems during the encapsulation process and ensures the stability and reliability of the battery.

[0083] The polymer lithium-ion battery design proposed in this invention has broad application prospects. It can be used not only in portable electronic devices and electric vehicles, but also in high-end fields such as energy storage systems and aerospace. Due to its excellent energy density, cycle life, and safety performance, this battery will become one of the important directions for future battery technology development.

[0084] In summary, the polymer lithium-ion battery design provided in Embodiment 2 of this utility model achieves a significant improvement in battery performance and reliability by cleverly integrating key components such as the battery cell, electrolyte, and aluminum-plastic film that prevents heat radiation from the encapsulation. This innovative design will inject new vitality into the development of the battery industry and promote the continuous progress and upgrading of related technologies.

[0085] Example 3

[0086] This utility model embodiment three provides a punching device for preparing an aluminum-plastic film that can prevent heat radiation during encapsulation, as provided in embodiment one above. The device includes an upper template, a lower template, and a punching mold core 5. Figure 4 As shown;

[0087] The upper template and the lower template are respectively disposed on two opposite surfaces of the aluminum-plastic film body to clamp the aluminum-plastic film body;

[0088] The punching die core 5 is directly facing the area on the aluminum-plastic film body where the first punching hole needs to be punched out.

[0089] The formula for calculating the width of the stamping surface of the punching die core 5 is as follows:

[0090] W3 = W1 - 2 * W2;

[0091] Wherein, W3 is the width of the first perforation, W1 is the width of the aluminum-plastic film body, and W2 is the width of the sealing edge;

[0092] The stamping depth of the punching die core 5 is greater than 4mm.

[0093] It should be noted that the upper template is an important component of the punching device. It is located above the aluminum-plastic film body and is used to provide stable support and clamping force during the punching process.

[0094] Corresponding to the upper template, the lower template is located below the aluminum-plastic film body and is also used to clamp the aluminum-plastic film body to ensure its stability and accuracy during the stamping process.

[0095] The punching die core 5 is the core component of the punching device, and it faces the area on the aluminum-plastic film body where the first punch needs to be punched. The design and structure of the punching die core directly determine the shape, size, and depth of the first punch.

[0096] In preparing the aluminum-plastic film that prevents heat radiation from the packaging, the aluminum-plastic film body is first placed on the lower template and clamped and fixed by the upper template. Then, the punching die core is aligned with the area where the first punching hole needs to be punched, and the punching operation is performed. After the punching is completed, the aluminum-plastic film body is removed, and the aluminum-plastic film with the first punching hole structure is obtained.

[0097] In one embodiment of this invention, the stamping surface of the punching die core 5 is inclined from one side to the opposite side from high to low. The inclined stamping surface helps to better distribute pressure during the stamping process, so that the stamping pressure can be applied more evenly to the aluminum-plastic film body. This uniform pressure distribution helps to reduce possible wrinkling, material tearing, deformation or damage at the stamping edge, thereby improving stamping quality and yield.

[0098] The punching device provided in this embodiment has broad application prospects. It can not only be used to prepare aluminum-plastic films that prevent heat radiation during packaging, but can also be extended to other fields requiring precise punching and depth control. Due to its advantages such as simple structure, convenient operation, high punching quality, and low cost, this punching device will become one of the important tools in the future battery packaging and aluminum-plastic film processing fields.

[0099] In summary, the punching device provided in Embodiment 3 of this utility model achieves efficient and precise punching of aluminum-plastic film through ingenious clamping design, accurate calculation of punching surface width, and depth control. This innovative design will provide strong support for technological advancement and industrial upgrading in the fields of battery packaging and aluminum-plastic film processing.

[0100] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. An aluminum-plastic film that prevents heat radiation from encapsulation, characterized in that, Includes an aluminum-plastic film body (1) and a first perforation (2); wherein, The first perforation (2) is used to form an air bag for storing electrolyte after the aluminum-plastic film body (1) is sealed; The first dent (2) is formed by stamping from one side surface of the aluminum-plastic film body (1) to the other side surface; The depth of the first crater (2) is greater than 4 mm; The formula for calculating the width of the first crater (2) is as follows: W3 = W1 - 2 * W2; Wherein, W3 is the width of the first perforation (2), W1 is the width of the aluminum-plastic film body (1), and W2 is the width of the sealing edge.

2. The aluminum-plastic film for preventing heat radiation during encapsulation according to claim 1, characterized in that, The depth of the first crater (2) is 4-6 mm.

3. The aluminum-plastic film for preventing heat radiation during encapsulation according to claim 1, characterized in that, The bottom surface of the first crater (2) is inclined from high to low from one side to the opposite side.

4. The aluminum-plastic film for preventing heat radiation during encapsulation according to claim 1, characterized in that, It also includes the second crater (3) and the third crater (4); The second perforation (3) and the third perforation (4) are used together to form a cavity for accommodating the battery cell after the aluminum-plastic film body (1) is encapsulated.

5. A polymer lithium-ion battery, characterized in that, Includes battery cells, electrolyte, and an aluminum-plastic film as described in any one of claims 1-4 that can prevent heat radiation from the encapsulation; The battery cell is housed in the aluminum-plastic film body; The electrolyte is stored in an airbag formed by the first punch after the aluminum-plastic film body is sealed.

6. A perforation device for preparing an aluminum-plastic film as described in any one of claims 1-4 that can prevent heat radiation from encapsulation, characterized in that, The device includes an upper template, a lower template, and a punching die core (5); The upper template and the lower template are respectively disposed on two opposite surfaces of the aluminum-plastic film body to clamp the aluminum-plastic film body; The punching die core (5) is directly opposite the area on the aluminum-plastic film body where the first punching hole needs to be punched out; The formula for calculating the width of the stamping surface of the punching die core (5) is as follows: W3 = W1 - 2 * W2; Wherein, W3 is the width of the first perforation, W1 is the width of the aluminum-plastic film body, and W2 is the width of the sealing edge; The stamping depth of the punching die core (5) is greater than 4mm.

7. The ditch flushing device according to claim 6, characterized in that, The stamping surface of the punching die core (5) is inclined from high to low from one side to the opposite side.

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