A flexible rolling device suitable for square shell lithium battery coating machine

Abstract

The present invention discloses a flexible rolling device suitable for a square-shell lithium battery coating machine. The flexible rolling device of the square-shell lithium battery coating machine of the present invention has concave-shaped covers at both ends of the roller, a layer of elastic lining is wrapped on the surface of the rigid roller, the lining is flush with the concave-shaped cover, a layer of modified nylon mesh is stretched between the covers at both ends, and a layer of silicone foam layer is coated on the outer layer of the nylon mesh. Through the structural form of the flexible roller itself, the battery shell and the flexible roller are closely fitted, and the force is evenly applied, so that the flexible silicone foam layer can be closely fitted on the coated battery, fully squeezing the blue film and the battery aluminum shell, and the gas between the two is rolled out, and finally the battery coating is free of bubbles and wrinkles.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery coating, and in particular to a flexible rolling device of a square shell lithium battery coating machine. Background Art

[0002] The outer surface of the battery is usually wrapped with a protective film, which can protect the battery on the one hand and make the battery look more beautiful on the other.

[0003] The protective film is usually used before the battery pack, and its main function is insulation protection. It is also used to wrap the surface of the battery cell before drying, and its main function is to protect the surface of the battery cell from scratches and electrolyte corrosion, which is an indispensable part of the battery production process.

[0004] At present, battery coating is mostly completed by automated equipment and manual labor. In the face of increasing market demand, fully automatic coating machines have become a trend. At the same time, the requirements for coating quality are getting higher and higher. At present, the coating rollers used in coating machines on the market are mostly rubber rollers, which are coated with a rubber layer on the roller surface and connected to solid shaft heads at both ends. The coating depends entirely on the pressure between the two rollers. Due to the limited deformation range and uneven deformation of the rubber layer, it is very easy to make the large surface, side and bottom of the square shell lithium battery difficult to be completely level. Therefore, problems such as bubbles and wrinkles appear during the coating process, seriously affecting product quality. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the existing rubber pressure roller and provide a flexible roller pressing device suitable for a square shell lithium battery coating machine with large elastic amplitude and uniform deformation.

[0006] In order to achieve the above-mentioned purpose, the present invention is a flexible rolling device suitable for a square shell lithium battery coating machine, which adopts the following technical scheme: the shaft head 3 and the cover 6 at both ends of the roller form a cavity 8. The axial cross-section of the cover 6 is concave, and the diameter of the cover 6 just meets the outer diameter of the roller 5, and the two are tightly fitted and sealed and welded. The shaft heads 3 at both ends are located at the center of one end outside the roller and are provided with an annular boss 4. The cover 6 is a concave ring, and the diameter of the cover just meets the sleeve on the shaft head and is limited to the boss 4. The two are sealed and welded. The ends of the two shaft heads 3 extending into the roller are provided with a center boss 10, and the end cover 7 is annular, and the outer diameter of the end cover is the same as the inner wall diameter of the roller. The inner diameter of the end cover just meets the sleeve on the center boss 10 and is welded to the center boss 10; the elastic lining 9 is adhered to the outer surface of the roller, and its thickness is consistent with the height of the concave edge of the cover 6. The modified nylon net 1 is wrapped around the concave outer edge of the elastic liner 9 and the cover 5, with a certain tension applied to both ends, and is welded to the cover by a drying gun. A rubber layer 2 is coated on the modified nylon net 1, and the material is selected from foamed silica gel material.

[0007] The present invention realizes close fitting of the battery shell with the flexible roller and uniform force through the mechanism of the flexible roller itself. Even if the position of the hollow roller body is not changed, the pressure between the flexible pressure roller and the battery shell can be fine-tuned to be uniform and moderate, meeting the requirement of uniform and appropriate roller pressure during the coating process.

[0008] The outer diameter of the shaft heads at both ends of the roller is the same as the inner diameter of the end cover, so they fit tightly and are easy to weld, are not easily deformed, and have higher mechanical strength.

[0009] An annular boss is provided at the outer end of the shaft head, and the sealing cover is connected to the annular boss. The annular boss is provided to increase the contact area between the sealing cover and the shaft head, so as to facilitate the fixed connection between the two.

[0010] The inner end of the shaft head is provided with a center boss, an end cover and a recessed center boss. The center boss is provided to increase the contact area between the end cover and the shaft head, making it easier to fix the end cover on the shaft head.

[0011] The elastic lining is made of high-density sponge elastic lining, which not only ensures the elasticity of the lining, but also ensures a certain degree of flexibility. The thickness of the lining is consistent with the height of the concave protruding end of the end cover.

[0012] The modified nylon mesh is made of toughened nylon, which has high toughness and provides certain strength support for the rubber coating layer of the roller.

[0013] The rubber coating layer on the outer surface of the drum is made of foamed silica gel, which is soft and has good adhesion.

[0014] The present invention uses the structure of the roller itself to enable the flexible rubber layer to fit tightly on the coated battery without changing the position of the flexible pressure roller, fully squeeze the blue film and the battery aluminum shell, push and roll out the gas between the two, and finally achieve a battery coating without bubbles and wrinkles.

[0015] The flexible pressing roller of the present invention can adjust the pressure between the rubber pressing roller and the battery shell without changing the position of the roller body, thereby avoiding a large number of bubbles and wrinkles in the film caused by the uneven surface of the battery, and achieving close combination with the battery surface through the flexible structure of the outer layer of the pressing roller itself, ensuring uniform force when the battery shell is filmed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall schematic diagram of the flexible pressure roller of the present invention;

[0017] Figure 2 It is a structural sectional view of the flexible pressure roller of the present invention. DETAILED DESCRIPTION

[0018] The essential features of the present invention are further described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] like Figure 1-2 As shown, the present invention includes a roller, and its roller 5 adopts a 3mm thick stainless steel tube. The shaft heads 3 and the cover 6 at both ends of the roller form a cavity 8. The axial section of the cover 6 is concave, and the diameter of the cover 6 just meets the outer diameter of the roller 5, and the two are tightly fitted and sealed and welded. The shaft heads 3 at both ends are located at the center of one end outside the roller and are provided with an annular boss 4. The cover 6 is a concave ring, and the diameter of the cover just meets the sleeve on the shaft head and is limited to the boss 4. The two are sealed and welded. The ends of the two shaft heads 3 extending into the roller are provided with a center boss 10, and the end cover 7 is annular, and the outer diameter of the end cover is the same as the inner wall diameter of the roller. The inner diameter of the end cover just meets the sleeve on the center boss 10 and is welded to the center boss 10; the elastic lining 9 is adhered to the outer surface of the roller, and its thickness is consistent with the height of the concave edge of the cover 6. The modified nylon net 1 is wrapped around the concave outer edge of the elastic liner 9 and the cover 5, with a certain tension applied to both ends, and is welded to the cover by a drying gun. A rubber layer 2 is coated on the modified nylon net 1, and the material is selected from foamed silica gel material.

[0020] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flexible rolling device suitable for a square shell lithium battery coating machine, characterized in that: The invention comprises a roller, shaft heads (3) and covers (6) arranged at both ends of the roller to form a cavity (8), the axial cross section of the cover (6) being concave, the cover and the roller being tightly fitted and sealed and welded; an annular boss (4) is provided at the center of one end of the shaft heads (3) located outside the roller, the cover is located inside the annular boss (4) of the shaft heads, the cover and the annular boss are sealed and welded, the end of the shaft head (3) extending into the roller is provided with a central boss (10), the end cover (7) is annular, and the end cover The outer diameter is the same as the inner diameter of the roller, the inner diameter of the end cover just fits on the central boss, and the end cover is welded to the central boss; the elastic liner (9) is adhered to the outer surface of the roller, a layer of modified nylon mesh (1) is stretched on the outer surface of the elastic liner (9), and a layer of silicone foam layer (2) is coated on the surface of the modified nylon mesh (1); the modified nylon mesh (1) is surrounded by the concave outer edge of the elastic liner (9) and the cover (6), a certain tension is applied to both ends, and it is welded to the cover by a drying gun.

Images