Aluminum-plastic composite film deep-drawing forming production line

Abstract

The utility model discloses an aluminum-plastic composite film deep-drawing forming production line which sequentially comprises an unwinding mechanism, a puncturing mechanism, a deep-drawing forming mechanism, a cutting mechanism and a material receiving mechanism in the conveying direction of an aluminum-plastic composite film. The puncturing mechanism comprises a first bayonet, a second bayonet, a third bayonet, a fourth bayonet and a puncturing driver used for driving the first bayonet, the second bayonet, the third bayonet and the fourth bayonet to do puncturing movement in the vertical direction, and the first bayonet and the second bayonet are aligned in the conveying direction of the aluminum-plastic composite film and are spaced by a preset first distance. The third bayonet and the fourth bayonet are aligned in the conveying direction of the aluminum-plastic composite film and are spaced by a preset second distance, the third bayonet and the first bayonet are arranged in a staggered mode in the conveying direction and the transverse width direction of the aluminum-plastic composite film, and the fourth bayonet and the second bayonet are arranged in a staggered mode in the conveying direction and the transverse width direction of the aluminum-plastic composite film; sand holes and damage generated in the process of forming a shell on an aluminum-plastic composite film through deep drawing are reduced.

Description

Technical Field

[0001] The utility model relates to the field of lithium battery manufacturing, and particularly to an aluminum-plastic composite film deep drawing forming production line for lithium batteries. Background Art

[0002] Aluminum-plastic composite films are widely used in the new energy industry, including but not limited to electronic cigarettes, energy storage, wearables, 3C, etc. The shapes of the deep-drawn formed shells corresponding to different application scenarios are different, the stretching areas are different, and the deep drawing depths are different. Therefore, the difficulty of deep drawing is different. Among them, due to the small stretching area and deep deep drawing depth of electronic cigarettes, it is easier to have sand holes or breakage during the process of deep drawing and forming the shell of the aluminum-plastic composite film.

[0003] At present, the common action process of the deep drawing forming process of aluminum-plastic composite films is: unwinding - forming - cutting - winding. The mold design of the forming station is also diversified, with one-out-one or one-out-two, which is specifically determined by the production capacity requirements. One-out-one means that the number of shells that can be deep-drawn and formed on the aluminum-plastic composite film in one forming action is one; one-out-two means that the number of shells that can be deep-drawn and formed on the aluminum-plastic composite film in one forming action is two. Of course, as the number of shells completed in one forming increases, the difficulty of deep drawing also increases, and the probability of sand holes / breakage also increases.

[0004] In addition, with the requirements of environmental protection, the size of lithium-ion batteries in the electronic cigarette scenario is also advancing from the 13 series to the 23 series. And a larger diameter means higher deep drawing; in the case of the same stretching area, the higher the deep drawing depth, the greater the difficulty of deep drawing, and the easier it is to have sand holes or breakage.

[0005] Whether it is a sand hole or breakage in deep drawing, microscopically, it is manifested as the fracture of the aluminum layer along with the nylon layer. The aluminum layer of the aluminum-plastic composite film has the function of isolating water vapor. After the aluminum layer of the aluminum-plastic composite film is fractured, water vapor penetrates through CPP and reacts with the electrolyte, causing the battery to bulge and forming a serious safety risk.

[0006] Compared with breakage, the sand holes in deep drawing are more difficult to be recognized by the naked eye because of their smaller fracture area. At present, in the industry, through spot checks, in a dark room, using a strong flashlight to face the pit surface of the shell directly, the sand hole sites will form light transmission for identification. It has strong concealment, and this method cannot achieve full coverage inspection. Therefore, the sand holes in deep drawing are more likely to flow to the client side than breakage.

[0007] Therefore, there is an urgent need for an aluminum-plastic composite film deep drawing forming production line to overcome one or more of the above defects. Summary of the Utility Model

[0008] The purpose of the utility model is to provide an aluminum-plastic composite film deep drawing forming production line to reduce the generation of sand holes and breakage during the process of deep drawing and forming a shell on the aluminum-plastic composite film.

[0009] To achieve the above object, the aluminum-plastic composite film deep drawing forming production line of the present utility model sequentially includes an unwinding mechanism, a puncturing mechanism, a deep drawing forming mechanism, a cutting mechanism, and a winding mechanism along the conveying direction of the aluminum-plastic composite film. The puncturing mechanism is located between the unwinding mechanism and the deep drawing forming mechanism. The puncturing mechanism includes a first bayonet, a second bayonet, a third bayonet, a fourth bayonet, and a puncturing driver for driving the first bayonet to the fourth bayonet to perform a puncturing movement in the up and down direction. The first bayonet and the second bayonet are aligned along the conveying direction of the aluminum-plastic composite film and spaced apart by a preset first distance. The third bayonet and the fourth bayonet are aligned along the conveying direction of the aluminum-plastic composite film and spaced apart by a preset second distance. The third bayonet is also arranged in a dislocation manner with the first bayonet in the conveying direction and the transverse width direction of the aluminum-plastic composite film. The fourth bayonet is also arranged in a dislocation manner with the second bayonet in the conveying direction and the transverse width direction of the aluminum-plastic composite film.

[0010] Compared with the prior art, by means of the special design of "the first bayonet and the second bayonet are aligned along the conveying direction of the aluminum-plastic composite film and spaced apart by a preset first distance, the third bayonet and the fourth bayonet are aligned along the conveying direction of the aluminum-plastic composite film and spaced apart by a preset second distance, the third bayonet is also arranged in a dislocation manner with the first bayonet in the conveying direction and the transverse width direction of the aluminum-plastic composite film, and the fourth bayonet is also arranged in a dislocation manner with the second bayonet in the conveying direction and the transverse width direction of the aluminum-plastic composite film", before the deep drawing forming of the shell, the specific area of the aluminum-plastic composite film is punctured to obtain a puncture opening with a specific effect, providing sufficient and uniform aluminum-plastic composite film extension compensation effect for the mechanical stretching of the formed shell, and finally reducing the sand holes / breakage generated by the deep drawing forming mechanism during the deep drawing forming of the shell from the aluminum-plastic composite film.

[0011] Preferably, the end face of the first bayonet facing the second bayonet and the end face of the third bayonet facing away from the fourth bayonet are coplanar. The end face of the second bayonet facing away from the first bayonet and the end face of the fourth bayonet facing the third bayonet are coplanar. The end faces of the first bayonet and the third bayonet facing each other in the transverse width direction of the aluminum-plastic composite film are coplanar. The end faces of the second bayonet and the fourth bayonet facing each other in the transverse width direction of the aluminum-plastic composite film are coplanar.

[0012] Preferably, each of the first bayonet to the fourth bayonet corresponds to the puncturing driver, and each of the first bayonet to the fourth bayonet is assembled and connected to the output end of the corresponding puncturing driver.

[0013] Preferably, the aluminum-plastic composite film deep drawing forming production line of the present utility model further includes a defect detection mechanism located between the deep drawing forming mechanism and the cutting mechanism along the conveying direction of the aluminum-plastic composite film.

[0014] Preferably, the defect detection mechanism includes an opaque sealed detection cavity with its inner wall coated with a photosensitive substance, a light source, and a laser automatic marking device located inside the sealed detection cavity.

[0015] Preferably, the deep drawing forming mechanism includes an upper template, a lower template, a die core, and an opening and closing drive. The lower template is inlaid with a rubber strip facing the upper template. The rubber strip extends along the transverse width direction of the aluminum-plastic composite film and protrudes beyond the aluminum-plastic composite film. The upper template is correspondingly provided with a grid-shaped embossing structure that cooperates with the rubber strip. The embossing structure extends along the transverse width direction of the aluminum-plastic composite film and protrudes beyond the aluminum-plastic composite film. The die core is assembled on the upper template and faces the lower template. The opening and closing drive is used to drive the upper template together with the die core to perform an opening and closing movement relative to the lower template.

[0016] Preferably, there are two rubber strips spaced apart by a preset third distance along the conveying direction of the aluminum-plastic composite film. The first distance and the second distance are equal. The thickness dimensions of the first bayonet to the fourth bayonet are the same. The third distance is one or several times the sum of the first distance and the thickness dimension of one of the first bayonets.

[0017] Preferably, the structures of the first bayonet to the fourth bayonet are the same, and the first bayonet to the fourth bayonet are all stainless steel bayonets.

[0018] Preferably, the material receiving mechanism includes a visual recognition device and a manipulator. The manipulator classifies and receives the good products and defective products cut out by the cutting mechanism in cooperation with the visual recognition device.

[0019] Preferably, the projected outer contour of the first bayonet to the fourth bayonet from top to bottom is a square with rounded corners. Description of the Drawings

[0020] Figure 1 is a plan view of the aluminum-plastic composite film deep drawing forming production line of the present utility model.

[0021] Figure 2 is a plan view of the deep drawing forming mechanism in the aluminum-plastic composite film deep drawing forming production line of the present utility model after hiding the opening and closing drive.

[0022] Figure 3 is Figure 2 a plan view of the upper template and the die core in the deep drawing forming mechanism shown, viewed from the bottom up. This plan view also shows a part of the aluminum-plastic composite film.

[0023] Figure 4 is Figure 2 a plan view of the lower template in the deep drawing forming mechanism shown, viewed from the top down. This plan view also shows a part of the aluminum-plastic composite film.

[0024] Figure 5 is a plan view showing the first bayonet to the fourth bayonet in the piercing mechanism when viewed from top to bottom.

[0025] Figure 6 is a state diagram showing the state of the partially aluminum-plastic composite plastic after being processed by the piercing mechanism and the deep drawing forming mechanism.

[0026] Figure 7 is a plan view showing the receiving mechanism.

[0027] Figure 8 is an internal view showing the defect detection mechanism. Detailed implementation mode

[0028] In order to elaborate on the technical content and structural features of the present utility model in detail, the following further description is made in conjunction with the implementation mode and with reference to the accompanying drawings.

[0029] Please refer to Figure 1 , the deep drawing forming production line 100 of the aluminum-plastic composite film of the present utility model sequentially includes an unwinding mechanism 10, a piercing mechanism 50, a deep drawing forming mechanism 20, a defect detection mechanism 60, a cutting mechanism 30 and a receiving mechanism 40 along the conveying direction of the aluminum-plastic composite film 200 (as indicated by the arrow A).

[0030] Among them, the unwinding mechanism 10 is used for unwinding the aluminum-plastic composite film coil; the piercing mechanism 50 is used for piercing the corresponding position of the aluminum-plastic composite film 200 that has passed through the piercing mechanism 50 and is unwound by the unwinding mechanism 10; the deep drawing forming mechanism 20 is used for deep drawing and forming the corresponding position of the aluminum-plastic composite film 200 that has passed through the deep drawing forming mechanism 20, so as to obtain the Figure 6 shown housing 230 on the aluminum-plastic composite film 200; the defect detection mechanism 60 is located between the deep drawing forming mechanism 20 and the cutting mechanism 30, and the defect detection mechanism 60 is used for detecting the housing 230 that follows the aluminum-plastic composite film 200 through the defect detection mechanism 60 to determine whether there are sand holes / damages in the housing 230; the cutting mechanism 30 is used for cutting the corresponding position of the aluminum-plastic composite film 200 that has passed through the cutting mechanism 30, so that the housing 230 is separated from the aluminum-plastic composite film 200; the receiving mechanism 40 is used for receiving the separated housing 230.

[0031] Combined with Figure 5, the piercing mechanism 50 is located between the unwinding mechanism 10 and the deep drawing forming mechanism 20. The piercing mechanism 50 includes a first bayonet 51, a second bayonet 52, a third bayonet 53, a fourth bayonet 54, and a piercing driver 55 for driving the first bayonet 51 to the fourth bayonet 54 to perform a piercing movement in the up and down direction. The first bayonet 51 and the second bayonet 52 are aligned along the conveying direction of the aluminum-plastic composite film 200 and spaced apart by a preset first distance D1. The third bayonet 53 and the fourth bayonet 54 are aligned along the conveying direction of the aluminum-plastic composite film 200 and spaced apart by a preset second distance D2. The third bayonet 53 is also arranged out of position with the first bayonet 51 in the conveying direction and the transverse width direction (as indicated by the arrow B) of the aluminum-plastic composite film 200. The fourth bayonet 54 is also arranged out of position with the second bayonet 52 in the conveying direction and the transverse width direction of the aluminum-plastic composite film 200. The state is shown in Figure 5 shown. Optionally, in Figure 5 , as an example, the end face 511 on the side of the first bayonet 51 facing the second bayonet 52 is coplanar with the end face 531 on the side of the third bayonet 53 facing away from the fourth bayonet 54. The end face 521 on the side of the second bayonet 52 facing away from the first bayonet 51 is coplanar with the end face 541 on the side of the fourth bayonet 54 facing the third bayonet 53. The end faces 512 (532) of the first bayonet 51 and the third bayonet 53 facing each other in the transverse width direction of the aluminum-plastic composite film 200 are coplanar. The end faces 522 (542) of the second bayonet 52 and the fourth bayonet 54 facing each other in the transverse width direction of the aluminum-plastic composite film 200 are coplanar. The state is shown in Figure 5 shown to further provide a sufficient and uniform aluminum-plastic composite film extension compensation effect for the mechanical stretching of the formed housing 230. More specifically, as follows:

[0032] Combined with Figure 1 and Figure 5, as an example, each of the first bayonet 51 to the fourth bayonet 54 corresponds to a piercing driver 55. Each of the first bayonet 51 to the fourth bayonet 54 is assembled and connected to the output end 551 of the corresponding piercing driver 55, so that the first bayonet 51 to the fourth bayonet 54 can perform piercing movements in the up and down directions independently; alternatively, as an example, the piercing driver 55 is a cylinder. Of course, it can also be other linear drivers, so it is not limited to this; in addition, the first bayonet 51 to the fourth bayonet 54 can also move in the transverse width direction of the aluminum-plastic composite film 200 to meet the requirement of the deep drawing forming mechanism 20 for one-out-two on the aluminum-plastic composite film 200. Specifically, as an example, the structures of the first bayonet 51 to the fourth bayonet 54 are the same, avoiding the trouble of complex manufacturing due to different structures; in addition, the first bayonet 51 to the fourth bayonet 54 are all stainless steel bayonets to improve the durability of the first bayonet 51 to the fourth bayonet 54; furthermore, the thickness dimensions T of the first bayonet 51 to the fourth bayonet 54 are the same, and the first distance D1 and the second distance D2 are equal; moreover, the outer contour of the projection of the first bayonet 51 to the fourth bayonet 54 from top to bottom is a square with rounded corners, and the state is shown in Figure 5 as shown, avoiding burrs and the like at the corners of the piercing cut 220 obtained on the aluminum-plastic composite film 200.

[0033] Combined with Figures 2 to 4 , the deep drawing forming mechanism 20 includes an upper template 21, a lower template 22, a die core 23 and an opening and closing driver 24. The lower template 22 is inlaid with a rubber strip 221 facing the upper template 21. The rubber strip 221 extends along the transverse width direction of the aluminum-plastic composite film 200 and extends beyond the aluminum-plastic composite film 200, and the state is shown in Figure 4 as shown. The upper template 21 is correspondingly provided with a grid-shaped embossing structure 211 that cooperates with the rubber strip 221. The embossing structure 211 extends along the transverse width direction of the aluminum-plastic composite film 200 and extends beyond the aluminum-plastic composite film 200, and the state is shown in Figure 3 as shown. The die core 23 is assembled on the upper template 21 and faces the lower template 22. The opening and closing driver 24 is used to drive the upper template 21 together with the die core 23 to perform an opening and closing movement relative to the lower template 22, so as to deep draw and form a housing 230 at the corresponding position of the aluminum-plastic composite film 200 passing through the deep drawing forming mechanism 20 (that is, the area defined by all the piercing cuts 220 obtained by the first bayonet 51 to the fourth bayonet 54), and the state is shown in Figure 5 as shown. Specifically, combined with Figure 4 and Figure 5 , as an example, there are two rubber strips 221 spaced apart by a preset third distance D3 along the conveying direction of the aluminum-plastic composite film 200. The third distance D1 is twice the sum of the first distance D1 and the thickness dimension T of a first bayonet 51 to meet the requirement of the deep drawing forming mechanism 20 for one-out-two on the aluminum-plastic composite film 200, and the state is shown in Figure 6As shown; obviously, according to actual needs, the third distance D1 can also be made one times the sum of the thickness dimension T of the first distance D1 and a first bayonet 51, so it is not limited to this description. Among them, with the help of the cooperation of the rubber strip 221 and the embossed structure 211, the deep drawing forming mechanism 20 not only forms the shell 230 on the aluminum-plastic composite film 200, but also embosses a grid-like mark to achieve the effect of isolating the tension. More specifically, as an example, the thickness dimension T of the first bayonet 51 to the fourth bayonet 54 is 1mm, the dimension of the first bayonet 51 to the fourth bayonet 54 in the horizontal width direction of the aluminum-plastic composite film 200 is 6mm, the first distance D1 and the second distance D2 are both 53mm, the dimension of the grid-like mark in the conveying direction of the aluminum-plastic composite film 200 is 2mm, and the puncture edge 220 obtained by the first bayonet 51 overlaps with the mark, as shown in the state. Figure 6 as shown on the left.

[0034] like Figure 1 and Figure 7 As shown, as an example, the receiving mechanism 40 includes a visual recognition device 41 and a manipulator 42. The manipulator 42, in cooperation with the visual recognition device 41, classifies and collects the good and bad products cut by the cutting mechanism 30 to prevent the bad products from flowing out. The visual recognition device 41 is used to identify the mark of the bad product marked by the defect detection mechanism 63, so that the manipulator 42 can classify and collect the good and bad products with the help of the visual recognition device 41.

[0035] like Figure 1 and Figure 8 As shown, the defect detection mechanism 60 includes a light-proof sealed detection cavity 61 whose inner wall is coated with photosensitive material, a light source 62 and a laser automatic marker 63 located in the sealed detection cavity 61, so the photosensitive reaction of the coated photosensitive material is used to determine whether there is sand hole / damage in the housing 230 following the aluminum-plastic composite film 200 passing through the defect detection mechanism 60, and further convert the chemical signal into an electrical signal, and the laser automatic marker 63 is linked to mark the defective housing 230, so as to facilitate the collection operation of the collection mechanism 40. Specifically, as an example, the wavelength of light emitted by the light source 62 is between 280 and 300 nm, so as to ensure that the irradiated light is evenly distributed inside the housing 230 on the aluminum-plastic composite film 200 without leaking.

[0036] Compared with the prior art, by means of the special design that "the first bayonet 51 and the second bayonet 52 are aligned along the conveying direction of the aluminum-plastic composite film 200 and spaced apart by a preset first distance D1, the third bayonet 53 and the fourth bayonet 54 are aligned along the conveying direction of the aluminum-plastic composite film 200 and spaced apart by a preset second distance D2, the third bayonet 53 is also arranged out of alignment with the first bayonet 51 in the conveying direction and the transverse width direction of the aluminum-plastic composite film 200, and the fourth bayonet 54 is also arranged out of alignment with the second bayonet 52 in the conveying direction and the transverse width direction of the aluminum-plastic composite film 200", before the deep-drawing forming of the housing 230, the specific area of the aluminum-plastic composite film 200 is punctured to obtain a puncture cut 220 with a specific effect, which further provides a sufficient and uniform aluminum-plastic composite film 200 extension compensation effect for the mechanical stretching of forming the housing 230, and finally reduces the sand holes / breakage generated during the deep-drawing forming of the housing 230 by the deep-drawing forming mechanism 20 on the aluminum-plastic composite film 200.

[0037] It should be noted that the conveying direction of the aluminum-plastic composite film 200 is also the direction where the length of the aluminum-plastic composite film 200 is located. In addition, although Figure 1 the aluminum-plastic composite film deep-drawing forming production line 100 is shown to include a defect detection mechanism 60, obviously, according to actual needs, the defect detection mechanism 60 can also be deleted, so it is not limited by Figure 1 what is shown.

[0038] The above-disclosed are only the preferred examples of the present invention, and the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention all fall within the scope covered by the present invention.

Claims

1. A deep-drawing production line for aluminum-plastic composite film, which comprises an unwinding mechanism, a deep-drawing mechanism, a cutting mechanism and a material receiving mechanism in sequence along the conveying direction of the aluminum-plastic composite film, characterized in that: The aluminum-plastic composite film deep-drawing forming production line also includes a puncturing mechanism, which is located between the unwinding mechanism and the deep-drawing forming mechanism along the conveying direction of the aluminum-plastic composite film. The puncturing mechanism includes a first bayonet, a second bayonet, a third bayonet, a fourth bayonet and a puncturing driver for driving the first bayonet to the fourth bayonet to perform puncturing movements in the up and down directions. The first bayonet and the second bayonet are aligned along the conveying direction of the aluminum-plastic composite film and are spaced apart by a preset first distance. The third bayonet and the fourth bayonet are aligned along the conveying direction of the aluminum-plastic composite film and are spaced apart by a preset second distance. The third bayonet is also staggered with the first bayonet in the conveying direction and the transverse width direction of the aluminum-plastic composite film. The fourth bayonet is also staggered with the second bayonet in the conveying direction and the transverse width direction of the aluminum-plastic composite film.

2. The aluminum-plastic composite film deep-drawing forming production line according to claim 1, characterized in that: The end face of the first bayonet facing the second bayonet is coplanar with the end face of the third bayonet facing away from the fourth bayonet, and the end face of the second bayonet facing away from the first bayonet is coplanar with the end face of the fourth bayonet facing the third bayonet; the end faces of the first bayonet and the third bayonet facing each other in the transverse width direction of the aluminum-plastic composite film are coplanar, and the end faces of the second bayonet and the fourth bayonet facing each other in the transverse width direction of the aluminum-plastic composite film are coplanar.

3. The aluminum-plastic composite film deep-drawing forming production line according to claim 1, characterized in that: The first to fourth bayonets each correspond to the puncture driver, and the first to fourth bayonets are each assembled and connected to the output end of the corresponding puncture driver.

4. The aluminum-plastic composite film deep-drawing forming production line according to claim 1, characterized in that: It also includes a defect detection mechanism located between the deep-drawing forming mechanism and the cutting mechanism along the conveying direction of the aluminum-plastic composite film.

5. The aluminum-plastic composite film deep-drawing forming production line according to claim 4, characterized in that: The defect detection mechanism comprises a light-proof closed detection cavity whose inner wall is coated with a photosensitive material, and a light source and a laser automatic marker located in the closed detection cavity.

6. The aluminum-plastic composite film deep-drawing forming production line according to claim 1, characterized in that: The deep-drawing forming mechanism comprises an upper template, a lower template, a mold core and an opening and closing driver. The lower template is inlaid with a rubber strip facing the upper template, and the rubber strip extends along the transverse width direction of the aluminum-plastic composite film and exceeds the aluminum-plastic composite film. The upper template is correspondingly provided with a grid-shaped embossed structure matched with the rubber strip, and the embossed structure extends along the transverse width direction of the aluminum-plastic composite film and exceeds the aluminum-plastic composite film. The mold core is assembled on the upper template and faces the lower template. The opening and closing driver is used to drive the upper template together with the mold core to perform opening and closing movements relative to the lower template.

7. The aluminum-plastic composite film deep-drawing forming production line according to claim 6, characterized in that: The rubber strips are two spaced apart by a preset third distance along the conveying direction of the aluminum-plastic composite film, the first distance and the second distance are equal, the thicknesses of the first to fourth bayonets are the same, and the third distance is one or several times the sum of the thicknesses of the first distance and one of the first bayonets.

8. The aluminum-plastic composite film deep-drawing forming production line according to claim 1, characterized in that: The first to fourth bayonets have the same structure, and are all stainless steel bayonets.

9. The aluminum-plastic composite film deep-drawing forming production line according to claim 1, characterized in that: The material receiving mechanism comprises a visual recognition device and a robot. The robot, in cooperation with the visual recognition device, classifies and receives good products and defective products cut by the cutting mechanism.

10. The aluminum-plastic composite film deep-drawing forming production line according to claim 1, characterized in that: The projected outer contours of the first to fourth bayonets from top to bottom are squares with rounded corners.

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