Aluminum plastic film edge sealing structure for solid-state battery and aluminum plastic film composite production device

Abstract

The utility model discloses an aluminum plastic film edge sealing structure for solid-state battery and aluminum plastic film composite production device, and aluminum plastic film includes first unit membrane and second unit membrane along the fold line, and first unit membrane is provided with electric core containing groove, and second unit membrane cover is established in the notching of electric core containing groove, and the side of electric core containing groove is sealed edge, and sealed edge comprises heat seal layer, aluminum foil layer and outer surface layer who are stacked in turn from inside to outside, the surface of heat seal layer away from aluminum foil layer is provided with concave-convex grain, and the surface of outer surface layer away from aluminum foil layer corresponding to first unit membrane is provided with bending groove, and the extension direction of bending groove is consistent with the length direction of sealed edge. Through the surface of heat seal layer away from aluminum foil layer is provided with concave-convex grain, effectively solve the misplacement of folding aluminum plastic film and lead to sealed edge misalignment, not only influence the appearance and size of battery, also influence the tightness of sealed edge, through the setting of bending groove, sealed edge bending resistance improves, is more docile, improves the tightness of sealing and battery size stability.

Description

Technical Field

[0001] This utility model relates to the field of aluminum-plastic film technology for batteries, and in particular to an edge sealing structure for aluminum-plastic film for solid-state batteries and an aluminum-plastic film composite production device. Background Technology

[0002] Aluminum-plastic film is an essential packaging material for soft-pack lithium batteries, which can protect the internal cells. The aluminum-plastic film needs to be folded during packaging, so the aluminum-plastic film needs to be resistant to bending to ensure that the folded edges are neat and the seal is tight.

[0003] When aluminum-plastic film is made into a film shell, the folded aluminum-plastic film may slip, causing the sealing edges to be misaligned, which can easily affect the appearance and size of the battery, and also poses a risk of encapsulation failure.

[0004] Therefore, it is necessary to improve the existing aluminum-plastic film edge sealing structure. Utility Model Content

[0005] One of the objectives of this invention is to overcome the defects in the existing technology and provide an aluminum-plastic film sealing structure and an aluminum-plastic film composite production device for solid-state batteries. By setting concave and convex textures on the surface of the heat-sealing layer away from the aluminum foil layer, the misalignment of the sealing edge caused by the folding of the aluminum-plastic film is effectively solved, which not only affects the appearance and size of the battery, but also affects the tightness of the sealing edge. By setting the bending groove, the bending resistance of the sealing edge is improved, making it more compliant and improving the tightness of the seal and the dimensional stability of the battery.

[0006] To achieve the above technical effects, the technical solution of this utility model is as follows: an aluminum-plastic film sealing structure for solid-state batteries, wherein the aluminum-plastic film includes a first unit film and a second unit film along the fold line, the first unit film is provided with a cell receiving groove, the second unit film is covered on the groove opening of the cell receiving groove, the side of the cell receiving groove is a sealing edge, and the sealing edge includes a heat sealing layer, an aluminum foil layer and an outer surface layer stacked sequentially from the inside to the outside;

[0007] The heat-sealing layer has a textured surface away from the aluminum foil layer, and the outer surface of the first unit film has a bending groove away from the aluminum foil layer. The extension direction of the bending groove is consistent with the length direction of the sealing edge.

[0008] A preferred technical solution is that the sealing edge bends along the bending groove close to the outer wall of the cell receiving groove. The sealing edge includes a first sealing edge and a second sealing edge corresponding to the first unit film and the second unit film, respectively. The first sealing edge is sandwiched between the second sealing edge and the outer wall. The width of the second sealing edge is greater than the width of the first sealing edge. The second sealing edge is provided with a bending portion, which is sandwiched between the first sealing edge and the outer wall.

[0009] A preferred technical solution is that the heat-sealing layer is a cast polypropylene layer and the outer surface layer is a nylon layer.

[0010] A preferred technical solution is that the heat-sealing layer and the aluminum foil layer are connected by a first adhesive layer, and the aluminum foil layer and the outer surface layer are connected by a second adhesive layer. The first adhesive layer is a maleic anhydride-modified polypropylene adhesive layer, and the second adhesive layer is a polyurethane adhesive layer.

[0011] A preferred technical solution is that the outer surface layer is a polyethylene terephthalate layer.

[0012] The second objective of this utility model is to overcome the defects existing in the prior art and provide an aluminum-plastic film composite production device, including a first surface composite mechanism and a second surface composite mechanism. The first surface composite mechanism includes an outer film unwinding unit, a first adhesive application unit, a first film guiding unit, a first drying unit, a second film guiding unit, a first surface composite unit, and a first winding unit connected in sequence. An aluminum foil unwinding unit is provided on the film entry side of the first surface composite unit to obtain a first composite film. A first micro-pressing device is provided between the outer film unwinding unit and the first adhesive application unit. The first micro-pressing device is provided with a punch head, and the punch head faces the surface of the outer film away from the aluminum foil film.

[0013] A preferred technical solution is that the punch head includes a plurality of unit punches arranged laterally along the outer surface film, the extension direction of the unit punches is consistent with the longitudinal direction of the outer surface film, and adjacent unit punches are spaced apart along the lateral direction of the outer surface film.

[0014] A preferred technical solution is that the bending grooves are arranged in groups along the outer surface membrane, and a blank portion is provided between adjacent groups of bending grooves.

[0015] A preferred technical solution is that the second surface lamination mechanism includes a second composite film unwinding unit, a second adhesive application unit, a third film guiding unit, a second drying unit, a fourth film guiding unit, a second surface lamination unit, and a second winding unit connected in sequence. A heat-sealing film unwinding unit is provided on the film entry side of the second surface lamination unit. A second micro-pressing device is provided between the heat-sealing film unwinding unit and the second surface lamination unit. The second micro-pressing device is provided with an embossing die head, which faces the surface of the heat-sealing film away from the aluminum foil film.

[0016] A preferred technical solution is that the embossing die head includes a plurality of unit dies arranged transversely along the heat-sealing film, the extension direction of the unit dies is consistent with the longitudinal direction of the heat-sealing film, and adjacent unit dies are spaced apart along the transverse direction of the heat-sealing film.

[0017] The advantages and beneficial effects of this utility model are as follows:

[0018] The surface of the heat-sealing layer away from the aluminum foil layer has a textured surface, which effectively solves the problem of misalignment of the sealing edge caused by the folding of the aluminum-plastic film. This not only affects the appearance and size of the battery, but also the tightness of the sealing edge. The setting of the bending groove improves the bending resistance of the sealing edge, makes it fit better, and improves the tightness of the seal and the dimensional stability of the battery. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the cell receiving groove and the sealing edge;

[0020] Figure 2 yes Figure 1 A magnified view of the sealing edge corresponding to A in the middle;

[0021] Figure 3 This is a schematic diagram of the aluminum-plastic film edge sealing structure;

[0022] Figure 4 This is a schematic diagram of the production equipment for the first surface composite mechanism;

[0023] Figure 5 This is a schematic diagram of the production equipment for the second surface composite mechanism;

[0024] Figure 6 This is a schematic diagram of the outer membrane with bent grooves.

[0025] Figure 7 This is a schematic diagram of a heat-sealing film with raised and recessed textures.

[0026] In the diagram: 1. First unit membrane; 2. Second unit membrane; 10. Cell receiving groove; 11. Sealing edge; 20. Bending section; 21. First sealing edge; 22. Second sealing edge; 30. First micro-pressing device; 31. Outer membrane unwinding unit; 32. First adhesive application unit; 33. First film guiding unit; 34. First drying unit; 35. Second film guiding unit; 36. First surface lamination unit; 37. First winding unit; 38. Aluminum foil unwinding unit; 4 0. Second micro-pressing device; 41. Second composite film unwinding unit; 42. Second adhesive application unit; 43. Third film guiding unit; 44. Second drying unit; 45. Fourth film guiding unit; 46. Second surface lamination unit; 47. Second winding unit; 48. Heat-sealing film unwinding unit; 101. First adhesive layer; 102. Second adhesive layer; 111. Embossed texture; 120. Bending groove; 121. Heat-sealing layer; 122. Aluminum foil layer; 123. Outer surface layer. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0028] The terms “inner,” “outer,” “side,” and “outer side” refer to the sealing structure of aluminum-plastic film for solid-state batteries and the normal operating state of aluminum-plastic film composite production equipment. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model.

[0029] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] like Figures 1-7 As shown, the aluminum-plastic film sealing structure for solid-state batteries of this utility model includes a first unit film 1 and a second unit film 2 along the fold line. The first unit film 1 is provided with a cell receiving groove 10, and the second unit film 2 covers the opening of the cell receiving groove 10. The side of the cell receiving groove 10 is a sealing edge 11. The sealing edge 11 includes a heat-sealing layer 121, an aluminum foil layer 122, and an outer surface layer 123 stacked sequentially from the inside to the outside. The surface of the heat-sealing layer 121 away from the aluminum foil layer 122 is provided with a textured surface 111. The surface of the outer surface layer 123 corresponding to the first unit film 1 away from the aluminum foil layer 122 is provided with a bending groove 120. The extension direction of the bending groove 120 is consistent with the length direction of the sealing edge 11.

[0031] The heat-sealing layer 121 has a textured surface 111 away from the aluminum foil layer 122, which effectively solves the problem of misalignment of the sealing edge 11 caused by the folding of the aluminum-plastic film. This not only affects the appearance and size of the battery, but also the tightness of the sealing edge 11. The bending groove 120 improves the bending resistance of the sealing edge 11, makes it fit better, and improves the tightness of the seal and the dimensional stability of the battery.

[0032] Specifically, the sealing edge 11 bends along the bending groove 122 close to the outer wall of the cell receiving groove 10. The sealing edge 11 includes a first sealing edge 21 and a second sealing edge 22 corresponding to the first unit film 1 and the second unit film 2, respectively. The first sealing edge 21 is sandwiched between the second sealing edge 22 and the outer wall (not marked). The width of the second sealing edge 22 is greater than the width of the first sealing edge 21. The second sealing edge 22 is provided with a bending portion 20, which is sandwiched between the first sealing edge 21 and the outer wall. This sealing structure of the sealing edge 11 not only ensures that the ends of the first sealing edge 21 and the second sealing edge 22 are not exposed, thus ensuring sealing performance, but also minimizes the impact of the simplified sealing structure on the overall width of the battery.

[0033] The heat-sealing layer 121 is a cast polypropylene layer, and the outer layer 123 is a nylon layer. Cast polypropylene has the characteristics of good heat sealing, resistance to electrolyte corrosion, and good flexibility. Nylon has good mechanical properties, puncture resistance, weather resistance, and the ability to block gases and water vapor.

[0034] The first adhesive layer 101 needs to be resistant to electrolyte. It needs to be stamped into an aluminum-plastic film to form a shell for packaging electrolyte. The aluminum-plastic film needs to be flexible and resistant to bending fatigue. Furthermore, the heat-sealing layer 121 and the aluminum foil layer 122 are connected by the first adhesive layer 101, and the aluminum foil layer 122 and the outer surface layer 123 are connected by the second adhesive layer 102. The first adhesive layer 101 is a maleic anhydride modified polypropylene adhesive layer, and the second adhesive layer 102 is a polyurethane adhesive layer.

[0035] In other embodiments, the outer layer 123 is a polyethylene terephthalate (PET) layer. PET exhibits good resistance to most acids, alkalis, salts, and organic solvents (such as ethanol and acetone), effectively protecting the aluminum foil layer and outer layer from corrosive media, extending the service life of the aluminum-plastic film, and is suitable for aluminum-plastic films requiring high resistance to electrolyte corrosion.

[0036] like Figures 4-7 As shown, the aluminum-plastic film composite production device includes a first surface composite mechanism and a second surface composite mechanism. The first surface composite mechanism includes an outer film unwinding unit 31, a first adhesive application unit 32, a first film guiding unit 33, a first drying unit 34, a second film guiding unit 35, a first surface composite unit 36, and a first winding unit 37 connected in sequence. An aluminum foil unwinding unit 38 is provided on the film entry side of the first surface composite unit 36 ​​to obtain a first composite film. A first micro-pressing device 30 is provided between the outer film unwinding unit 31 and the first adhesive application unit 32. The first micro-pressing device 30 is provided with a punch head (not shown), which faces the surface of the outer film away from the aluminum foil film.

[0037] The punch head includes several unit punches arranged transversely along the outer film. The extension direction of the unit punches is consistent with the longitudinal direction of the outer film, and adjacent unit punches are spaced apart along the transverse direction of the outer film. The bending grooves obtained by the unit punches extend along the longitudinal direction of the outer film and are arranged transversely to ensure that the traction force in the longitudinal direction of the outer film, i.e., along the film-moving direction, is constant, and also ensure the structural stability of the outer film.

[0038] The bending grooves 120 are arranged in groups along the transverse direction of the outer film, with blank areas between adjacent groups of bending grooves. The resulting outer film is as follows: Figure 6 As shown. The blank area indicates that no bending groove is provided, which facilitates the arrangement of the second unit membrane covering the slot of the cell receiving groove where the first unit membrane is located.

[0039] like Figure 5 As shown, the second surface lamination mechanism includes a second lamination film unwinding unit 41, a second adhesive application unit 42, a third film guiding unit 43, a second drying unit 44, a fourth film guiding unit 45, a second surface lamination unit 46, and a second winding unit 47 connected in sequence. A heat-sealing film unwinding unit 48 is provided on the film-entry side of the second surface lamination unit 46. A second micro-pressing device 40 is provided between the heat-sealing film unwinding unit 48 and the second surface lamination unit 46. The second micro-pressing device 40 is equipped with an embossing die head (not shown), which faces the surface of the heat-sealing film away from the aluminum foil film. Further, the embossing die head includes several unit dies arranged transversely along the heat-sealing film. The extension direction of the unit dies is consistent with the longitudinal direction of the heat-sealing film, and adjacent unit dies are spaced apart transversely along the heat-sealing film. The resulting heat-sealing film is as follows: Figure 7 As shown. Furthermore, the spacing between adjacent unit dies must be compatible with the spacing between unit punches.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An aluminum-plastic film sealing structure for solid-state batteries, wherein the aluminum-plastic film includes a first unit film and a second unit film along the fold line, the first unit film is provided with a cell receiving groove, the second unit film is covered on the opening of the cell receiving groove, the side of the cell receiving groove is a sealing edge, and the sealing edge includes a heat sealing layer, an aluminum foil layer and an outer surface layer stacked sequentially from the inside to the outside. Its features are, The heat-sealing layer has a textured surface away from the aluminum foil layer, and the outer surface of the first unit film has a bending groove away from the aluminum foil layer. The extension direction of the bending groove is consistent with the length direction of the sealing edge.

2. The aluminum-plastic film edge-sealing structure for solid-state batteries according to claim 1, characterized in that, The sealing edge bends along the bending groove close to the outer wall of the cell receiving groove. The sealing edge includes a first sealing edge and a second sealing edge corresponding to the first unit film and the second unit film, respectively. The first sealing edge is sandwiched between the second sealing edge and the outer wall. The width of the second sealing edge is greater than the width of the first sealing edge. The second sealing edge is provided with a bending portion, which is sandwiched between the first sealing edge and the outer wall.

3. The aluminum-plastic film edge-sealing structure for solid-state batteries according to claim 1, characterized in that, The heat-sealing layer is a cast polypropylene layer, and the outer layer is a nylon layer.

4. The aluminum-plastic film edge-sealing structure for solid-state batteries according to claim 1, characterized in that, The heat-sealing layer and the aluminum foil layer are connected by a first adhesive layer, and the aluminum foil layer and the outer surface layer are connected by a second adhesive layer. The first adhesive layer is a maleic anhydride-modified polypropylene adhesive layer, and the second adhesive layer is a polyurethane adhesive layer.

5. The aluminum-plastic film edge-sealing structure for solid-state batteries according to claim 1, characterized in that, The outer layer is a polyethylene terephthalate layer.

6. An aluminum-plastic film composite production apparatus, comprising a first surface laminating mechanism and a second surface laminating mechanism, wherein the first surface laminating mechanism comprises an outer film unwinding unit, a first adhesive application unit, a first film guiding unit, a first drying unit, a second film guiding unit, a first surface laminating unit, and a first winding unit connected in sequence, wherein an aluminum foil unwinding unit is provided on the film input side of the first surface laminating unit to obtain a first composite film, characterized in that, Based on the solid-state battery aluminum-plastic film sealing structure according to any one of claims 1 to 5, a first micro-pressing device is provided between the outer film unwinding unit and the first adhesive application unit, and the first micro-pressing device is provided with a punch head, the punch head facing the surface of the outer film away from the aluminum foil film.

7. The aluminum-plastic film composite production apparatus according to claim 6, characterized in that, The punch head includes a plurality of unit punches arranged laterally along the outer surface film. The extension direction of the unit punches is consistent with the longitudinal direction of the outer surface film, and adjacent unit punches are spaced apart along the lateral direction of the outer surface film.

8. The aluminum-plastic film composite production apparatus according to claim 7, characterized in that, The bending grooves are arranged in groups along the outer membrane, and blank areas are provided between adjacent groups of bending grooves.

9. The aluminum-plastic film composite production apparatus according to claim 6, characterized in that, The second surface lamination mechanism includes a second lamination film unwinding unit, a second adhesive application unit, a third film guiding unit, a second drying unit, a fourth film guiding unit, a second surface lamination unit, and a second winding unit connected in sequence. A heat-sealing film unwinding unit is provided on the film entry side of the second surface lamination unit. A second micro-pressing device is provided between the heat-sealing film unwinding unit and the second surface lamination unit. The second micro-pressing device is provided with an embossing die head, which faces the surface of the heat-sealing film away from the aluminum foil film.

10. The aluminum-plastic film composite production apparatus according to claim 9, characterized in that, The embossing die head includes several unit dies arranged laterally along the heat-sealing film. The extension direction of the unit dies is consistent with the longitudinal direction of the heat-sealing film, and adjacent unit dies are spaced apart along the transverse direction of the heat-sealing film.

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