An apparatus and method for detecting a rupture of an aluminum layer of an aluminum laminate film

Abstract

The application provides an aluminum-plastic film aluminum layer breakage detection device and a detection method, and belongs to the technical field of new energy battery detection equipment. The detection device comprises a light condensing base and a detection assembly. The light condensing base has an inner cavity, the top of the light condensing base is provided with a light transmission plate for accommodating the aluminum-plastic film, and the bottom of the inner cavity is provided with an illuminometer. The detection assembly comprises a lifting device and a detection pressing plate, the detection pressing plate is arranged above the light condensing base, a profiled bump is protrusively arranged on one side of the detection pressing plate facing the light transmission plate, a light emitter is arranged on the profiled bump, and the detection pressing plate is connected with the lifting device. The aluminum-plastic film aluminum layer breakage detection device and the detection method provided by the application are not restricted by the detection environment, can guarantee the effectiveness of the detection structure, and improve the detection popularity and detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of new energy battery testing equipment technology, and in particular to a device and method for detecting aluminum layer cracks in aluminum-plastic film. Background Technology

[0002] In the production process of soft-pack lithium-ion batteries, aluminum-plastic film stamping is an essential step. The stamping of aluminum-plastic film mainly utilizes its good ductility to achieve physical deformation, forming a fixed shape for easy storage of the battery cores. Currently, commonly used aluminum-plastic films on the market mainly consist of three layers: a nylon layer, an aluminum layer, and a CPP (cast polypropylene) heat-sealing layer, from the outside in. The nylon layer primarily serves for screen printing and protecting the aluminum layer. The aluminum layer mainly functions to block light and isolate air. The CPP heat-sealing layer is mainly used to prevent electrolyte corrosion and for encapsulation.

[0003] During the stamping process, aluminum-plastic film is prone to damage due to factors such as changes in friction on the stamping surface. When this aluminum-plastic film is applied to battery cells, it can easily cause corrosion and leakage, leading to short circuits and corrosion of other components. In related technologies, the detection of aluminum layer damage in aluminum-plastic film typically involves placing the film in a copper chloride solution. The reaction between aluminum and copper chloride is observed, and the presence of purplish-red copper deposits on the film surface is used to determine if the aluminum layer is damaged.

[0004] Using existing testing methods, the chemical reagent testing of aluminum-plastic film during the mass production of lithium-ion batteries cannot be directly performed due to humidity requirements and production pace within the workshop. Samples must be sent to a laboratory for random inspection. This results in low efficiency and limited adoption of methods for detecting aluminum layer cracks in aluminum-plastic film. Summary of the Invention

[0005] This invention provides a device and method for detecting aluminum layer cracks in aluminum-plastic film, which is not limited by the testing environment and can improve the accessibility and efficiency of the detection while ensuring the effectiveness of the detected structure. The technical solution is as follows:

[0006] In a first aspect, embodiments of the present invention provide an aluminum-plastic film aluminum layer crack detection device, comprising:

[0007] A light-concentrating base has an inner cavity. A light-transmitting plate for holding aluminum-plastic film is provided on the top of the light-concentrating base, and an illuminance meter is provided at the bottom of the inner cavity.

[0008] The detection assembly includes a lifting device and a detection plate. The detection plate is disposed above the light-concentrating base. A contoured protrusion is provided on one side of the detection plate facing the light-transmitting plate. A light-emitting element is provided on the contoured protrusion. The detection plate is connected to the lifting device, which is configured to drive the detection plate to move up and down in a direction perpendicular to the light-transmitting plate.

[0009] Optionally, the contouring protrusion is semi-cylindrical, and the detection plate is provided with a plurality of the contouring protrusions, which are arranged in a rectangular frame that matches the stamping and bending part of the aluminum-plastic film.

[0010] Optionally, the light-emitting body is strip-shaped and arranged along the length of the contoured protrusion, and the light-emitting body is located at the apex of the contoured protrusion.

[0011] Optionally, a sealing ring is provided on the detection plate, and the sealing ring surrounds the periphery of the plurality of contoured protrusions.

[0012] Optionally, the detection plate is provided with an air filling / draining hole, which is arranged inside the plurality of directional protrusions.

[0013] Optionally, the light-transmitting plate is provided with a positioning groove for holding the aluminum-plastic film.

[0014] Optionally, a light-collecting plate is installed on the side wall of the inner cavity, the light-collecting plate is arranged at an acute angle to the bottom of the inner cavity, and the light-collecting plate is connected to the illuminance meter.

[0015] Optionally, the aluminum-plastic film aluminum layer crack detection device further includes a side protection box, which includes a plurality of side light-shielding walls connected in sequence. The side light-shielding walls are coated with light-absorbing material. The height of the side protection box is greater than the height of the light-concentrating base in the direction perpendicular to the light-transmitting plate. The side protection box is arranged around the outside of the light-concentrating base.

[0016] Optionally, the aluminum-plastic film aluminum layer crack detection device further includes a lifting cylinder, the cylinder body of which is located next to the light-concentrating base, and the telescopic rod of which is perpendicular to the light-transmitting plate and connected to the side protection box.

[0017] Secondly, embodiments of the present invention also provide a detection method, implemented based on the aluminum-plastic film aluminum layer crack detection device described in the first aspect, the detection method comprising:

[0018] The aluminum-plastic film to be tested is placed on the light-transmitting plate on the light-concentrating base;

[0019] The lifting device is used to drive the detection plate to press down on the light-transmitting plate until the contoured protrusion contacts the stamped and bent part of the aluminum-plastic film;

[0020] The light-emitting body on the contoured protrusion is activated to emit light, and the illuminance at the bottom of the inner cavity is collected using the illuminance meter. The illuminance is then used to detect the cracking of the aluminum layer of the aluminum-plastic film.

[0021] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0022] The aluminum-plastic film aluminum layer crack detection device provided in this embodiment of the invention uses a liftable detection pressure plate that cooperates with a light-transmitting plate on a focusing base to clamp and fix the aluminum-plastic film to be tested. During clamping, a light-emitting element on a contoured protrusion that mates with the stamped and bent portion of the aluminum-plastic film is activated. The light-emitting element emits light, which works in conjunction with an illuminance meter at the bottom of the focusing base to detect cracks in the aluminum layer of the aluminum-plastic film through illumination. This method eliminates the need for chemical reagents and is not limited by the testing environment. It can be performed immediately after the aluminum-plastic film is stamped, thus improving the effectiveness of the detection structure while increasing the accessibility and efficiency of the detection process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the aluminum layer crack detection device for aluminum-plastic film provided in an embodiment of the present invention;

[0025] Figure 2 This is a partial structural diagram of the aluminum-plastic film aluminum layer crack detection device provided in the embodiment of the present invention in the detection state;

[0026] Figure 3 This is a schematic diagram of the internal structure of the light-concentrating base provided in an embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional view of the assembly structure of the focusing base provided in an embodiment of the present invention;

[0028] Figure 5 This is a three-dimensional structural schematic diagram of the light-transmitting plate provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the detection pressure plate provided in an embodiment of the present invention;

[0030] Figure 7 This is a three-dimensional structural diagram of the side protection box provided in an embodiment of the present invention;

[0031] Figure 8 This is a flowchart of a detection method provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 1-Concentrating base; 1a-Inner cavity; 2-Detection component; 3-Side protective box; 4-Lifting cylinder; 11-Light-transmitting plate; 12-Luminometer; 13-Light-collecting plate; 21-Lifting device; 22-Detection pressure plate; 31-Light-shielding wall; 111-Positioning groove; 221-Shaping protrusion; 222-Sealing ring; 223-Inflation / depression hole; 2211-Light-emitting body; m-Aluminum-plastic film. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0035] During the stamping process, aluminum-plastic film is prone to damage due to factors such as changes in friction on the stamping surface. When this aluminum-plastic film is applied to battery cells, it can easily cause corrosion and leakage, leading to short circuits and corrosion of other components. In related technologies, the detection of aluminum layer damage in aluminum-plastic film typically involves placing the film in a copper chloride solution. The reaction between aluminum and copper chloride is observed, and the presence of purplish-red copper deposits on the film surface is used to determine if the aluminum layer is damaged.

[0036] Using existing testing methods, the chemical reagent testing of aluminum-plastic film during the mass production of lithium-ion batteries cannot be directly performed due to humidity requirements and production pace within the workshop. Samples must be sent to a laboratory for random inspection. This results in low efficiency and limited adoption of methods for detecting aluminum layer cracks in aluminum-plastic film.

[0037] Figure 1 This is a schematic diagram of the aluminum layer crack detection device for aluminum-plastic film provided in an embodiment of the present invention. Figure 2 This is a partial structural diagram of the aluminum-plastic film aluminum layer crack detection device provided in the embodiment of the present invention in the detection state. Figure 3 This is a schematic diagram of the internal structure of the light-concentrating base provided in an embodiment of the present invention. Figure 4 This is a cross-sectional view of the assembly structure of the focusing base provided in an embodiment of the present invention. Figure 5 This is a three-dimensional structural diagram of the light-transmitting plate provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the structure of the detection pressure plate provided in an embodiment of the present invention. Figure 7 This is a three-dimensional structural diagram of the side protection box provided in an embodiment of the present invention. Figures 1 to 7 As shown, through practice, the applicant provides an aluminum-plastic film aluminum layer crack detection device, including a focusing base 1 and a detection component 2.

[0038] The light-concentrating base 1 has an inner cavity 1a. The top of the light-concentrating base 1 is provided with a light-transmitting plate 11 for holding the aluminum-plastic film m, and the bottom of the inner cavity 1a is provided with a lux meter 12.

[0039] The detection assembly 2 includes a lifting device 21 and a detection pressure plate 22. The detection pressure plate 22 is disposed above the light-concentrating base 1, and a contoured protrusion 221 is provided on the side of the detection pressure plate 22 facing the light-transmitting plate 11. A light-emitting element 2211 is provided on the contoured protrusion 221. The detection pressure plate 22 is connected to the lifting device 21, which is configured to drive the detection pressure plate 22 to move up and down in a direction perpendicular to the light-transmitting plate 11.

[0040] In this embodiment of the invention, when it is necessary to detect the cracking of the aluminum layer of the aluminum-plastic film m, the operator can place the stamped aluminum-plastic film m on the light-transmitting plate 11 on the light-concentrating base 1. When placed, the stamped groove of the aluminum-plastic film m faces the detection pressure plate 22. Then, the lifting device 21 drives the detection pressure plate 22 to press down on the light-transmitting plate 11 until the detection pressure plate 22 contacts the aluminum-plastic film m. The protruding contoured bump 221 on the detection pressure plate 22 extends into the groove formed by the stamping of the aluminum-plastic film m, until the contoured bump 221 contacts the stamped and bent portion of the aluminum-plastic film m. Then, the light-emitting element 2211 set on the contoured bump 221 is activated to emit light. The illuminance meter 12 collects the luminous flux at the bottom of the inner cavity 1a, and the luminous flux is used to detect the cracking condition of the aluminum layer of the aluminum-plastic film m. If the aluminum layer of the aluminum-plastic film m is not cracked, the light emitted by the light-emitting body 2211 cannot penetrate the aluminum-plastic film m, and the illuminance meter 12 located at the bottom of the focusing base 1 will not detect the light, or can only detect a weak ambient light. However, when the aluminum layer of the aluminum-plastic film m is cracked, the light emitted by the light-emitting body 2211 will pass through the crack in the aluminum layer and propagate through the light-transmitting plate 11 to the inner cavity 1a of the focusing base 1, and will finally be detected by the illuminance meter 12 at the bottom. When the luminous flux is greater than the threshold for normal detection of ambient light, it means that the aluminum layer of the aluminum-plastic film m is cracked, and the staff can pick out the detected defective products.

[0041] The aluminum-plastic film aluminum layer crack detection device provided in this embodiment of the invention uses a liftable detection pressure plate 22 to clamp and fix the aluminum-plastic film m to be tested in cooperation with the light-transmitting plate 11 on the focusing base 1. During clamping, the light-emitting element 2211 on the contoured protrusion 221 that cooperates with the stamping and bending part of the aluminum-plastic film m is activated. The light-emitting element 2211 emits light, which works in conjunction with the illuminance meter 12 at the bottom of the inner cavity 1a of the focusing base 1 to detect the cracking of the aluminum layer in the aluminum-plastic film m through illumination. This method eliminates the need for chemical reagents and is not restricted by the testing environment. It can be performed immediately after the aluminum-plastic film m is stamped, thus improving the effectiveness of the detection structure while increasing the accessibility and efficiency of the detection.

[0042] For example, in an embodiment of the present invention, the light source 2211 can be an LED light group nested in the contoured protrusion 221.

[0043] Optionally, the contouring protrusion 221 is semi-cylindrical, and multiple contouring protrusions 221 are provided on the detection pressure plate 22. These protrusions are arranged in a rectangular frame shape that matches the stamping and bending portion of the aluminum-plastic film m. For example, after the opening groove is formed on the aluminum-plastic film m during stamping, the bending connection between the sidewall and bottom of the opening groove is the location where the internal aluminum layer is most prone to cracking. In this embodiment, by setting the contouring protrusion 221 as a protruding semi-cylindrical shape, and providing four contouring protrusions 221 on the detection pressure plate 22, these four protrusions are arranged in a rectangular frame shape that matches the outline of the opening groove on the aluminum-plastic film m. When the aluminum-plastic film m is pressed down and fixed by the detection pressure plate 22, the four contouring protrusions 221 will respectively abut against the bending connection between the sidewall and bottom of the opening groove, achieving stable contact. Meanwhile, the rounded outer surface can also reduce friction and impact during contact, avoiding damage to the aluminum-plastic film and improving the practicality of the aluminum layer crack detection device.

[0044] Optionally, the light-emitting body 2211 is strip-shaped and arranged along the length of the contoured protrusion 221, with the light emitted at the apex of the contoured protrusion 221. Exemplarily, in this embodiment of the invention, by setting the light-emitting body 2211 as a strip-shaped structure arranged along the length of the contoured protrusion 221, the light emitted when it emits light can be emitted from the apex of the contoured protrusion 221 and illuminate the contact point between the apex of the contoured protrusion 221 and the aluminum-plastic film m via the shortest path. This is the bend connection point between the sidewall and bottom of the opening groove on the aluminum-plastic film m, enabling targeted light detection of the location most prone to cracking of the internal aluminum layer. This reduces unnecessary and redundant light illumination on other locations of the aluminum-plastic film m, reduces energy consumption, and improves the detection specificity of the aluminum layer crack detection device.

[0045] Optionally, a sealing ring 222 is provided on the detection plate 22, and the sealing ring 222 surrounds the periphery of the plurality of contoured protrusions 221. Exemplarily, in this embodiment of the invention, by providing a sealing ring 222 around the periphery of the plurality of contoured protrusions 221, when the light-emitting element 2211 on the contoured protrusions 221 is used to perform light illumination detection on the aluminum-plastic film m, the ambient light that may exist around the contact surface between the detection plate 22 and the aluminum-plastic film m can be blocked and isolated, preventing the penetration of external light from affecting the detection results. Simultaneously, light leakage is also prevented, improving the detection accuracy of the aluminum layer crack detection device for aluminum-plastic film.

[0046] Optionally, the detection plate 22 is provided with an air filling / draining hole 223, which is arranged inside the protrusions in multiple directions. Exemplarily, in this embodiment of the invention, in conjunction with the sealing ring 222, after the detection plate 22 and the aluminum-plastic film m are pressed into contact, a sealed space is formed between the detection plate 22, the sealing ring 222, the opening groove of the aluminum-plastic film m within the range of the sealing ring 222, and the contoured protrusions 221. During testing, compressed air is injected into this sealed space through the air filling / draining hole 223 located in the middle, followed by a vacuum cycle, causing the surface of the aluminum-plastic film m to undergo slight wrinkling due to the internal air pressure. If the aluminum layer of the aluminum-plastic film m is not damaged, it does not affect the detection result; if the aluminum layer of the aluminum-plastic film m is damaged, the above operation can further increase the possible gaps between cracks, allowing the light emitted by the light source 2211 to pass through more fully and be detected by the illuminance meter 12, thus improving the detection effect.

[0047] Optionally, the light-transmitting plate 11 is provided with a positioning groove 111 for holding the aluminum-plastic film m. For example, in this embodiment of the invention, when placing the aluminum-plastic film m, the bottom of its opening groove can be placed in the positioning groove 111 on the light-transmitting plate 11, facilitating its cooperation with the contoured protrusion 221 when the pressure plate 22 is pressed down subsequently, reducing positioning difficulty and further improving the practicality of the aluminum layer crack detection device for aluminum-plastic film.

[0048] Optionally, a light-collecting plate 13 is installed on the side wall of the inner cavity 1a. The light-collecting plate 13 is arranged at an acute angle to the bottom of the inner cavity 1a, and the light-collecting plate 13 is connected to the illuminance meter 12. Exemplarily, in this embodiment of the invention, the outer shell of the focusing base 1 is made of 304 stainless steel, and the light-transmitting plate 11 is embedded inside the opening at its top, ensuring that light around the light-transmitting plate 11 cannot be diffused to the outside. On the side wall of the inner cavity 1a, a light-collecting plate 13 with a 45° angle is installed on each side. Each light-collecting plate 13 can be used to collect light penetrating through the broken aluminum layer of the aluminum-plastic film m, avoiding direct absorption or refraction of light at different angles after it hits the side wall of the inner cavity 1a, thus preventing changes in light transmission and further improving the detection accuracy of the aluminum layer breakage detection device.

[0049] For example, in this embodiment of the invention, the connection between the light-collecting plate 13 and the base plate around the inner cavity 1a is mirror-polished to ensure light reflection and minimize the absorption of light by the material.

[0050] Optionally, the aluminum-plastic film aluminum layer crack detection device further includes a side protection box 3. The side protection box 3 includes multiple side light-shielding walls 31 connected in sequence. The side light-shielding walls 31 are coated with light-absorbing material. The height of the side protection box 3 is greater than the height of the focusing base 1 in the direction perpendicular to the light-transmitting plate 11. The side protection box 3 is arranged around the outside of the focusing base 1. Exemplarily, in this embodiment of the invention, the aluminum-plastic film aluminum layer crack detection device further includes a lifting cylinder 4. The cylinder body of the lifting cylinder 4 is arranged beside the focusing base 1. The telescopic rod of the lifting cylinder 4 is perpendicular to the light-transmitting plate 11 and connected to the side protection box 3. During the illumination detection of the aluminum-plastic film m, the side protection box 3 will descend under the drive of the lifting cylinder 4 and surround and enclose the detection pressure plate 22, the aluminum-plastic film m, and the focusing base 1 that are pressed together, providing a darkroom effect and eliminating the influence of ambient light on the test structure. The light-shielding wall 31 can be made of aerospace aluminum and its interior is coated with a light-absorbing material, which can effectively prevent internal light reflection from affecting the test structure of the detection device and further improve the detection accuracy of the aluminum-plastic film aluminum layer crack detection device.

[0051] Figure 8 This is a flowchart of a detection method provided in an embodiment of the present invention. For example... Figure 8 As shown, embodiments of the present invention also provide a detection method for molding and manufacturing such as Figures 1 to 7 The aluminum-plastic film aluminum layer crack detection device shown includes the following detection method:

[0052] S1. Place the aluminum-plastic film m to be tested on the light-transmitting plate 11 on the light-concentrating base 1.

[0053] Specifically, when it is necessary to detect aluminum layer cracking in the aluminum-plastic film m, the operator can place the stamped aluminum-plastic film m on the light-transmitting plate 11 on the light-concentrating base 1. When placing the aluminum-plastic film m, the stamped groove should face the detection pressure plate 22.

[0054] S2. Using the lifting device 21, drive the detection pressure plate 22 to press down on the light-transmitting plate 11 until the contoured protrusion 221 contacts the stamped and bent part of the aluminum-plastic film m.

[0055] Specifically, the lifting device 21 drives the detection plate 22 to press down on the light-transmitting plate 11 until the detection plate 22 contacts the aluminum-plastic film m. The protruding contoured protrusion 221 on the detection plate 22 extends into the groove formed by the stamping process of the aluminum-plastic film m until the contoured protrusion 221 contacts the stamping and bending part of the aluminum-plastic film m.

[0056] S3. Activate the light-emitting body 2211 on the contour protrusion 221 to make the light-emitting body 2211 emit light, use the illuminance meter 12 to collect the light flux at the bottom of the inner cavity 1a, and use the light flux to detect the cracking of the aluminum layer of the aluminum-plastic film m.

[0057] Specifically, the light-emitting element 2211, located on the contour protrusion 221, is then activated to emit light. The illuminance meter 12 collects the luminous flux at the bottom of the inner cavity 1a, and uses this luminous flux to detect the cracking of the aluminum layer of the aluminum-plastic film m. If the aluminum layer of the aluminum-plastic film m is not cracked, the light emitted by the light-emitting element 2211 cannot penetrate the aluminum-plastic film m, and the illuminance meter 12 at the bottom of the focusing base 1 does not detect the light, or can only detect weak ambient light. However, when the aluminum layer of the aluminum-plastic film m is cracked, the light emitted by the light-emitting element 2211 passes through the cracks in the aluminum layer and propagates through the light-transmitting plate 11 into the inner cavity 1a of the focusing base 1, where it is finally detected by the illuminance meter 12 at the bottom. When the luminous flux exceeds the threshold for normal ambient light detection, it indicates that the aluminum layer of the aluminum-plastic film m is cracked, and the defective product can be picked up by the staff.

[0058] Using the aluminum-plastic film aluminum layer crack detection device and the above-described detection method provided in this embodiment of the invention, the aluminum-plastic film m to be tested is clamped and fixed by the cooperation of the liftable detection pressure plate 22 and the light-transmitting plate 11 on the focusing base 1. During the clamping process, the light-emitting element 2211 on the contoured protrusion 221 that cooperates with the stamping and bending part of the aluminum-plastic film m is activated. The light-emitting element 2211 emits light, which works in conjunction with the illuminance meter 12 at the bottom of the inner cavity 1a of the focusing base 1 to detect the cracking of the aluminum layer in the aluminum-plastic film m through illumination. The detection operation does not require the use of chemical reagents and is not restricted by the detection environment. It can be performed after the stamping of the aluminum-plastic film m, which can improve the accessibility and efficiency of the detection while ensuring the effectiveness of the detection structure.

[0059] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0060] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting aluminum layer cracks in aluminum-plastic film, characterized in that, include: A light-concentrating base (1) has an inner cavity (1a). A light-transmitting plate (11) for holding aluminum-plastic film (m) is provided on the top of the light-concentrating base (1), and an illuminance meter (12) is provided at the bottom of the inner cavity (1a). The detection assembly (2) includes a lifting device (21) and a detection plate (22). The detection plate (22) is disposed above the light-concentrating base (1). A contoured protrusion (221) is provided on one side of the detection plate (22) facing the light-transmitting plate (11). A light-emitting element (2211) is provided on the contoured protrusion (221). The detection plate (22) is connected to the lifting device (21). The lifting device (21) is configured to drive the detection plate (22) to move up and down in a direction perpendicular to the light-transmitting plate (11). The contouring protrusion (221) is semi-cylindrical, and the detection plate (22) is provided with a plurality of the contouring protrusions (221). The plurality of the contouring protrusions (221) are arranged around to form a rectangular frame that matches the stamping and bending part of the aluminum-plastic film (m). A sealing ring (222) is provided on the detection pressure plate (22), and the sealing ring (222) is arranged around the periphery of the plurality of contour protrusions (221); The detection plate (22) is provided with an air filling and venting hole (223), which is arranged on the inner side of the plurality of contour protrusions (221); With the sealing ring (222), after the detection plate (22) and the aluminum-plastic film (m) are pressed into contact, a sealed space is formed between the detection plate (22), the sealing ring (222), the opening groove of the aluminum-plastic film (m) within the range of the sealing ring (222), and the contoured protrusion (221). The air filling and emptying hole (223) is configured to fill the sealed space with compressed air and then perform a vacuum cycle so that the surface of the aluminum-plastic film (m) is subjected to the internal air pressure and produces a wrinkled action.

2. The aluminum-plastic film aluminum layer crack detection device according to claim 1, characterized in that, The light-emitting body (2211) is strip-shaped and arranged along the length direction of the contoured protrusion (221), and the light-emitting body (2211) is located at the top of the arc of the contoured protrusion (221).

3. The aluminum-plastic film aluminum layer crack detection device according to any one of claims 1 to 2, characterized in that, The light-transmitting plate (11) is provided with a positioning groove (111) for holding the aluminum-plastic film (m).

4. The aluminum-plastic film aluminum layer crack detection device according to any one of claims 1 to 2, characterized in that, A light-collecting plate (13) is installed on the side wall of the inner cavity (1a). The light-collecting plate (13) is arranged at an acute angle to the bottom of the inner cavity (1a). The light-collecting plate (13) is connected to the illuminance meter (12).

5. The aluminum-plastic film aluminum layer crack detection device according to any one of claims 1 to 2, characterized in that, The aluminum-plastic film aluminum layer crack detection device also includes a side protection box (3), which includes a plurality of side light-shielding walls (31) connected in sequence. The side light-shielding walls (31) are coated with light-absorbing material. The height of the side protection box (3) is greater than the height of the light-concentrating base (1) in the direction perpendicular to the light-transmitting plate (11). The side protection box (3) is arranged around the outside of the light-concentrating base (1).

6. The aluminum-plastic film aluminum layer crack detection device according to claim 5, characterized in that, The aluminum-plastic film aluminum layer crack detection device also includes a lifting cylinder (4), the cylinder body of the lifting cylinder (4) is located on the side of the light-concentrating base (1), and the telescopic rod of the lifting cylinder (4) is perpendicular to the light-transmitting plate (11) and connected to the side protection box (3).

7. A detection method, implemented based on the aluminum-plastic film aluminum layer crack detection device as described in any one of claims 1 to 6, the detection method comprising: The aluminum-plastic film (m) to be tested is placed on the light-transmitting plate (11) on the light-concentrating base (1); The lifting device (21) is used to drive the detection plate (22) to press down on the light-transmitting plate (11) until the contoured protrusion (221) contacts the stamped and bent part of the aluminum-plastic film (m); The light-emitting body (2211) on the contour protrusion (221) is activated to make the light-emitting body (2211) emit light. The illuminance meter (12) is used to collect the light flux at the bottom of the inner cavity (1a). The light flux is used to detect the cracking of the aluminum layer of the aluminum-plastic film (m).

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