Automatic packaging device and packaging process for aluminum plastic film of lithium battery

Abstract

The invention relates to the technical field of lithium battery processing, and discloses a lithium battery aluminum plastic film automatic packaging device and packaging technology, the packaging device comprises a base, an automatic packaging assembly and a processing seat; the automatic packaging assembly and the processing base are sequentially installed on the base, a groove is formed in the processing base, and a preheating area and a rolling area which are sequentially arranged are formed in the groove. The battery cell wrapped with the aluminum-plastic film is fixed to the limiting driving assembly and placed in the preheating area, hot air provided by the hot air assembly is directly blown to the aluminum-plastic film through the first hot air pipe, the aluminum-plastic film can be preheated, a preheating space can be formed through the shielding assembly in the preheating area, the blown hot air is blocked, the hot air is prevented from being diffused, and the service life of the battery cell is prolonged. Hot air can directly act on the aluminum plastic film, polymer materials in the aluminum plastic film can be softened, rigidity of the polymer materials is reduced, ductility of the polymer materials is improved through hot air preheating, then the aluminum plastic film is rolled, and wrinkles on the surface of the aluminum plastic film can be effectively removed.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery processing, and in particular to an automatic packaging device and packaging process for lithium battery aluminum-plastic films. Background Art

[0002] With the rapid development of the new energy industry, the application of lithium batteries in the automotive field has increased dramatically. Lithium batteries play an increasingly important role in electric vehicles due to their flexible shape, good safety performance and high energy density. The lightweight characteristics of lithium batteries improve the overall energy efficiency of electric vehicles, reduce the overall weight of the vehicle, and help improve handling, increase driving range and improve acceleration performance. Lithium batteries need to be encapsulated with aluminum-plastic film during processing. There are dynamic electrochemical reactions inside lithium-ion batteries, which are sensitive to moisture and oxygen. The significance of encapsulation is to use high-barrier soft packaging materials to completely isolate the inside of the battery cell from the outside, so that the inside is in a vacuum, oxygen-free and water-free environment, thereby protecting the electrochemical properties of the battery cell. Through aluminum-plastic film encapsulation, lithium batteries can work safely and efficiently in cars, while extending their service life and reliability, providing stable and lasting power support for electric vehicles; When encapsulating lithium batteries with aluminum-plastic film, first design a corresponding mold according to the size requirements of the battery cell, and stamp the aluminum-plastic film to form a pit, which is also called punching. Then, after the battery cell is loaded into the pit of the aluminum-plastic film, the aluminum-plastic film is folded in half to expose the tabs of the battery cell and heat-sealed. During the encapsulation process, the upper and lower heads have a certain temperature, and when they are closed, they are pressed on the aluminum-plastic film where the tabs are located, so that the PP layer of the aluminum-plastic film is melted and bonded together to achieve sealing; In the process of encapsulating battery cells with aluminum-plastic film, the battery cells need to be manually loaded into the pits of the aluminum-plastic film, and then the aluminum-plastic film is folded in half and heat-sealed. Since the aluminum-plastic film has a certain ductility, the top surface of the aluminum-plastic film is easily wrinkled during the folding process. Such wrinkles will unfold after heat sealing, resulting in a gap between the aluminum-plastic film and the battery cell, thereby affecting the sealing of the package and the performance of the battery cell.

[0003] In order to solve the above problems, the present application proposes an automatic packaging device and packaging process for lithium battery aluminum-plastic film. Summary of the invention

[0004] The present invention proposes an automatic packaging device and packaging process for lithium battery aluminum-plastic film, which solves the problem in the related art that the aluminum-plastic film has a certain ductility, which easily leads to wrinkles on the top surface of the aluminum-plastic film during the folding process. Such wrinkles will unfold after heat sealing, resulting in a gap between the aluminum-plastic film and the battery cell.

[0005] The invention provides an automatic packaging device for aluminum-plastic films of lithium batteries, comprising a base, an automatic packaging component and a processing seat; The automatic packaging component and the processing seat are sequentially installed on the base, a groove is provided in the processing seat, and a preheating area and a rolling area are sequentially arranged in the groove, a limiting driving component for limiting the position of the to-be-packaged parts and transporting them from the preheating area to the rolling area is provided in the groove, and the to-be-packaged parts located in the rolling area are packaged by the automatic packaging component; The processing seat is provided with an assembly block and a driving member for driving the assembly block to move toward the automatic packaging assembly, the assembly block is provided with a roller pressing assembly located below it and an electric push rod for driving the roller pressing assembly to move up and down, the roller pressing assembly is provided with a first hot air pipe arranged toward the preheating area, the bottom of the roller pressing assembly is provided with a second hot air pipe, and the assembly block is provided with a hot air component for supplying hot air to the first hot air pipe and the second hot air pipe and switching the hot air path; The processing seat is provided with a shielding component connected with the assembly block and located above the preheating area, and the shielding component forms an air passage between the preheating area and the bottom of the groove.

[0006] As a further optimization scheme of the present invention, the rolling assembly includes a fixed seat, an elastic reset member, a rolling strip and a pressure roller. The fixed seat is connected to the driving end of the electric push rod, and rolling strips are installed on both sides of the bottom of the fixed seat through elastic reset members. An active chamber is opened at the bottom of the rolling strip, and a pressure roller placed in the active chamber is arranged at the bottom of the rolling strip, and the two ends of the pressure roller are respectively rotatably connected to the inner walls at both ends of the rolling strip.

[0007] As a further optimization scheme of the present invention, the elastic reset member includes a reset rod, a U-shaped block, a second rotating shaft and a torsion spring. Open grooves are provided on both sides of the bottom of the rolling assembly. A U-shaped block is installed on the rolling strip block. The two ends of the reset rod are respectively located in the open groove and the U-shaped block, and the reset rod is inclined from the fixed seat side to the rolling strip block side. The bottom end of the reset rod is rotatably matched with the U-shaped block. Second rotating shafts are installed on both sides of the top of the reset rod. The ends of the two second rotating shafts away from the reset rod are respectively rotatably connected to the inner walls on both sides of the opening groove. The two second rotating shafts are respectively sleeved with torsion springs, and the two ends of the two torsion springs are respectively connected to the two sides of the reset rod and the inner walls on both sides of the opening groove.

[0008] As a further optimization scheme of the present invention, the hot air assembly includes a bellows, an electric heating rod, an ion blower, an air guide pipe and an air guide switching component, the first hot air pipe is installed on the side of the roller assembly, the first hot air pipe is connected to a plurality of first air nozzles arranged toward the bottom of the preheating area, the bottom of the roller assembly is provided with an open groove, the second hot air pipe is installed in the open groove, the bottom of the second hot air pipe is connected to a plurality of second air nozzles arranged at intervals, the bellows is installed on the top of the assembly block, the electric heating rod is installed in the bellows, the top of the bellows is installed with an ion blower connected to the interior thereof, the bottom of the bellows is connected to the air guide pipe placed under the assembly block, the first air outlet hoods connected to the interior thereof are respectively installed on both sides of the first air outlet hood, and the position of the first air outlet hood on the air guide pipe is higher than the second air outlet hood, the first air outlet hood is connected to the first hot air duct through the first air supply duct, the second air outlet hood is connected to the second hot air duct through the second air supply duct, and the air guide pipe is inserted with an air guide switching component.

[0009] As a further optimization scheme of the present invention, the air guide switching member includes an air passing block, a connecting frame, a sealing block and a connecting rod. The bottom of the air guide duct is a through structure. The air passing block and the sealing block are both slidably arranged in the air guide duct, and the air passing block and the sealing block are connected by the connecting frame. A through flow passage is opened in the air passing block, and a connecting rod connected to a fixing seat is installed at the bottom of the sealing block. The air passing block and the sealing block have a first position state and a second position state. When the air passing block and the sealing block are in the first position state, the connecting rod is located above the first air outlet hood, and the sealing block blocks the second air outlet hood; when the air passing block and the sealing block are in the second position state, the electric push rod drives the fixed seat to move downward, the connecting rod drives the sealing block and the air passing block to move downward, the air passing block blocks the first air outlet hood, and the sealing block is located below the second air outlet hood.

[0010] As a further optimization scheme of the present invention, the shielding assembly includes a storage box, a first rotating shaft, a roller and a sealing film. The storage box located in the preheating area is installed at one end of the processing seat away from the automatic packaging assembly. The inner walls on both sides of the storage box are rotatably connected to the first rotating shaft, and a roller is fixedly connected between the two first rotating shafts. The sealing film is wound relative to the roller, and a strip opening is opened on the side of the storage box. One end of the sealing film passes through the strip opening and is connected to the assembly block, and a coil spring is cooperated between the first rotating shaft and the sealing film.

[0011] As a further optimization scheme of the present invention, the limit drive assembly includes an electric slide rail and a limit seat, an installation groove is provided at the bottom of the groove, the electric slide rail is installed in the installation groove, a limit seat is installed at the driving end of the electric slide rail, a limit groove for limiting the packaged component is provided in the limit seat, and the limit groove runs through the side of the limit seat close to the automatic packaging assembly.

[0012] As a further optimization scheme of the present invention, the driving member includes a second cylinder, and slide grooves are opened on both sides of the top of the processing seat. Slide blocks are installed at both ends of the assembly block. The two slide blocks are respectively slidably matched with the two slide grooves. The second cylinder is installed in the slide groove. The slide block is connected to the second cylinder and driven by the second cylinder to slide along the slide groove.

[0013] As a further optimization scheme of the present invention, the automatic packaging component includes an assembly plate, a lower head, an assembly rack, a first cylinder and an upper head. The assembly plate is installed on the base and is located at the end of the processing seat. The assembly rack is installed on the assembly plate. The first cylinder is installed on the assembly rack. The driving end of the first cylinder is connected to the upper head. The lower head located below the upper head is installed on the assembly plate.

[0014] A lithium battery aluminum-plastic film packaging process, using the above-mentioned lithium battery aluminum-plastic film automatic packaging device, comprises the following steps: S1. Stamping: According to the size requirements of the battery cell, the corresponding mold is designed to stamp the aluminum-plastic film and form pits on the aluminum-plastic film; S2. Loading the battery cell: After loading the battery cell into the aluminum-plastic film pit, fold the aluminum-plastic film in half so that the tab of the battery cell is exposed, and then fix the aluminum-plastic film wrapping the battery cell to the limit drive assembly so that it is placed in the preheating area on the processing seat; S3, preheating and dust removal: The hot air is guided to the first hot air duct through the hot air component, and the hot air is blown to the aluminum-plastic film in the preheating area through the first hot air duct to achieve the effect of preheating and dust removal. The hot air carries the fine dust particles on the aluminum-plastic film and is discharged through the air passage; S4, rolling process: after the aluminum-plastic film is preheated, the battery cell wrapped with the aluminum-plastic film is transported to the rolling area through the limit drive assembly, the upper tab packaging part of the battery cell is placed at the position of the automatic packaging assembly, and then the rolling assembly is driven by the electric push rod to move down and press against the surface of the aluminum-plastic film. At this time, the hot air guided into the first hot air duct by the hot air assembly is switched to the second hot air duct to blow toward the aluminum-plastic film, and then the assembly block is driven by the driving member to move toward the automatic packaging assembly. When the assembly block moves, the surface of the aluminum-plastic film is rolled by the rolling assembly, and the hot air blowing of the second hot air duct cooperates with the rolling of the rolling assembly to achieve rolling and blowing; S5. Packaging process: After rolling the aluminum-plastic film on the battery cell, the aluminum-plastic film can be automatically packaged by an automatic packaging component.

[0015] The above technical solution of the present invention has the following beneficial technical effects: 1. Aiming at the problem that the aluminum-plastic film has a certain ductility and is prone to wrinkles on the top surface of the aluminum-plastic film during the folding process, the present invention fixes the battery core wrapped with the aluminum-plastic film on the limit drive assembly and places it in the preheating area, and uses the first hot air pipe to blow the hot air provided by the hot air assembly directly to the aluminum-plastic film, so that the aluminum-plastic film can be preheated, and the shielding assembly in the preheating area can form a preheating space to block the blown hot air to prevent the hot air from dispersing, so that the hot air can directly act on the aluminum-plastic film, and the hot air preheating can soften the polymer material in the aluminum-plastic film, reduce its rigidity, and increase ductility, and the preheating can release the internal stress in the aluminum-plastic film to a certain extent, so that the material is in a relatively relaxed state, which is conducive to reducing the local stress concentration of the material during the rolling process, thereby reducing the probability of wrinkles. In addition, by blowing hot air to the aluminum-plastic film, fine dust particles attached to the aluminum-plastic film can be directly discharged through the air passage formed between the shielding assembly and the bottom of the groove, which plays a role in dust removal and improves the quality of lithium battery processing; 2. After the aluminum-plastic film is preliminarily preheated, it is transported to the rolling area through the limit drive component, and the surface of the aluminum-plastic film is rolled by the rolling component to smooth the aluminum-plastic film. During the rolling process, not only can the aluminum-plastic film be shaped to make its surface smoother, but the gas inside the material can also be removed, which helps to further reduce the generation of wrinkles and improve the sealing of the package. During rolling, the hot air component switches the hot air to the second hot air pipe, and blows hot air to the surface of the aluminum-plastic film through the second hot air pipe to achieve the action of rolling and blowing, so that the aluminum-plastic film is always in a dynamic stress balance state during the rolling process. The continuous heating of the hot air can alleviate the stress concentration caused by rolling, reduce wrinkles and material damage caused by stress mutations, and make the aluminum-plastic film smoothly transition under uniform heating and pressure, thereby improving the packaging quality.

[0016] 3. During the lithium battery packaging process, the aluminum-plastic film at the tab of the battery cell needs to be pressed and packaged by an automatic packaging component. The aluminum-plastic film in the pressing area will be subjected to a large tension, causing it to be tightened. This tightened state is likely to cause wrinkles on the surface of the aluminum-plastic film. During pressing, the top of the pressing area of ​​the aluminum-plastic film can be pressed by a rolling component. By applying a pressing force on the upper part, the pressure distribution in the pressing area can be made more uniform, which can effectively reduce excessive stretching and wrinkles of the aluminum-plastic film caused by excessive local pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of an automatic aluminum-plastic film packaging device for lithium batteries proposed by the present invention.

[0018] Figure 2 The present invention provides a schematic diagram of the packaging structure of components to be packaged in an automatic aluminum-plastic film packaging device for lithium batteries.

[0019] Figure 3 The present invention is a schematic structural diagram of an automatic packaging component in an automatic aluminum-plastic film packaging device for lithium batteries.

[0020] Figure 4 The present invention is a schematic structural diagram of an assembly block and a rolling assembly in an automatic packaging device for aluminum-plastic films of lithium batteries.

[0021] Figure 5 The present invention is a schematic structural diagram of an elastic reset member in an automatic aluminum-plastic film packaging device for lithium batteries.

[0022] Figure 6 The present invention is a schematic structural diagram of a first hot air pipe and a second hot air pipe in an automatic aluminum-plastic film packaging device for lithium batteries.

[0023] Figure 7 The present invention is a schematic structural diagram of a hot air component in an automatic aluminum-plastic film packaging device for lithium batteries.

[0024] Figure 8 The present invention is a schematic structural diagram of an air guide duct and an air guide switching member in an automatic packaging device for aluminum-plastic film of a lithium battery.

[0025] Fig. 9 The present invention is a schematic structural diagram of switching the direction of hot air flow in an air duct in an automatic aluminum-plastic film packaging device for lithium batteries.

[0026] Fig.10 The present invention is a schematic structural diagram of a shielding component in an automatic aluminum-plastic film packaging device for lithium batteries.

[0027] Fig.11 The present invention is a schematic structural diagram of a limit drive assembly in an automatic aluminum-plastic film packaging device for lithium batteries.

[0028] Figure numerals: 1, base; 2, automatic packaging assembly; 21, assembly plate; 22, lower head; 23, assembly frame; 24, first cylinder; 25, upper head; 3, processing seat; 31, assembly block; 32, electric push rod; 33, slider; 34, slide; 35, second cylinder; 4, limit drive assembly; 41, electric slide rail; 42, limit seat; 5, shielding assembly; 51, storage box; 52, first rotating shaft; 53, roller column; 54, sealing film; 55, coil spring; 6, rolling assembly; 61, fixed seat; 62, elastic reset member; 621, reset Position rod; 622, U-shaped block; 623, second rotating shaft; 624, torsion spring; 63, roller block; 64, pressure roller; 7, first hot air pipe; 71, first air nozzle; 8, second hot air pipe; 81, second air nozzle; 9, hot air assembly; 91, bellows; 92, electric heating rod; 93, ion fan; 94, air guide duct; 941, first air outlet hood; 942, second air outlet hood; 943, first air supply duct; 944, second air supply duct; 95, air guide switching member; 951, air passing block; 952, connecting frame; 953, sealing block; 954, connecting rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0030] like Figure 1-11 As shown, the present invention provides an automatic packaging device for aluminum-plastic films of lithium batteries, comprising a base 1, an automatic packaging component 2 and a processing seat 3; The automatic packaging component 2 and the processing seat 3 are sequentially installed on the base 1. A groove is provided in the processing seat 3, and a preheating area and a rolling area are sequentially arranged in the groove. A limiting driving component 4 is provided in the groove to limit the position of the to-be-packaged component and transport it from the preheating area to the rolling area. The to-be-packaged component located in the rolling area is packaged by the automatic packaging component 2. The processing seat 3 is provided with an assembly block 31 and a driving member for driving the assembly block 31 to move toward the automatic packaging component 2, the assembly block 31 is provided with a roller pressing component 6 located below it and an electric push rod 32 for driving the roller pressing component 6 to move up and down, the roller pressing component 6 is provided with a first hot air pipe 7 arranged toward the preheating area, the bottom of the roller pressing component 6 is provided with a second hot air pipe 8, and the assembly block 31 is provided with a hot air component 9 for supplying hot air to the first hot air pipe 7 and the second hot air pipe 8 and switching the hot air path; A shielding assembly 5 connected to the assembly block 31 and located above the preheating area is provided on the processing seat 3. The shielding assembly 5 forms an air passage between the preheating area and the bottom of the groove.

[0031] refer to Figure 4 and Figure 5 In this embodiment, the rolling assembly 6 includes a fixed seat 61, an elastic reset member 62, a rolling strip 63 and a pressure roller 64. The fixed seat 61 is connected to the driving end of the electric push rod 32. The rolling strips 63 are installed on both sides of the bottom of the fixed seat 61 through the elastic reset member 62. The bottom of the rolling strip 63 is provided with an active chamber. The bottom of the rolling strip 63 is provided with a pressure roller 64 placed in the active chamber. The two ends of the pressure roller 64 are respectively rotatably connected to the inner walls of the two ends of the rolling strip 63. The elastic reset member 62 includes a reset rod 621, a U-shaped block 622, a second rotating shaft 623 and a torsion spring 624. The bottom of the rolling assembly 6 is provided with a movable chamber at both sides. There is an open groove, and a U-shaped block 622 is installed on the rolling strip block 63. The two ends of the reset rod 621 are respectively located in the open groove and the U-shaped block 622, and the reset rod 621 is inclined from the fixed seat 61 side to the rolling strip block 63 side. The bottom end of the reset rod 621 is rotatably matched with the U-shaped block 622. Second rotating shafts 623 are installed on both sides of the top of the reset rod 621. The ends of the two second rotating shafts 623 away from the reset rod 621 are respectively rotatably connected to the inner walls on both sides of the open groove. Torsion springs 624 are sleeved on the two second rotating shafts 623. The two ends of the two torsion springs 624 are respectively connected to the two sides of the reset rod 621 and the inner walls on both sides of the open groove.

[0032] It should be noted that: when rolling the aluminum-plastic film, it is only necessary to guide the aluminum-plastic film wrapping the battery cell to the rolling area through the limit drive assembly 4, and then the fixed seat 61 can be driven downward by the electric push rod 32, so that the pressure roller 64 at the bottom of the rolling strip block 63 presses against the surface of the aluminum-plastic film. When the pressure roller 64 presses against the aluminum-plastic film, the reset rod 621 on the rolling strip block 63 is subjected to force and its bottom end rotates with the U-shaped block 622, and the second rotating shaft 623 at the top of the reset rod 621 rotates with the inner wall of the open groove, and the torsion spring connected to the reset rod 621 rotates. 624 also undergoes corresponding deformation, thereby pushing the pressure rollers 64 on both sides of the fixed seat 61 to roll on the aluminum-plastic film and move away from each other. Under the action of the two pressure rollers 64, the surface of the aluminum-plastic film is tightened, and then the assembly block 31 is driven by the driving member to approach or move away from the automatic packaging component 2. When the assembly block 31 moves, it can drive the rolling component 6 to move as a whole. The pressure roller 64 at the bottom of the rolling strip block 63 can roll the surface of the aluminum-plastic film, thereby leveling the aluminum-plastic film and preventing wrinkles from occurring during the packaging of the aluminum-plastic film.

[0033] It should be further explained that, during the lithium battery packaging process, the aluminum-plastic film at the battery cell tab portion needs to be pressed and packaged by the automatic packaging component 2, the aluminum-plastic film in the pressing area will be subjected to greater tension, causing it to be tightened. This tightened state is likely to cause wrinkles on the surface of the aluminum-plastic film. For this reason, when pressing and packaging it, the driving member can drive the assembly block 31 to drive the rolling component 6 to move, so that the pressure roller 64 at the bottom of the rolling strip block 63 is pressed on the top area of ​​the aluminum-plastic film packaging position. By applying a resisting pressure on the upper part, the pressure distribution in the pressing area can be made more uniform, which can effectively reduce excessive stretching and wrinkling of the aluminum-plastic film caused by excessive local pressure.

[0034] refer to Figure 4 , Figure 7 , Figure 8 and Fig. 9In this embodiment, the hot air assembly 9 includes a bellows 91, an electric heating rod 92, an ion blower 93, an air guide pipe 94 and an air guide switching member 95. The first hot air pipe 7 is installed on the side of the roller pressing assembly 6. The first hot air pipe 7 is connected to a plurality of first air nozzles 71 arranged toward the bottom of the preheating area. An open groove is provided at the bottom of the roller pressing assembly 6. The second hot air pipe 8 is installed in the open groove. The bottom of the second hot air pipe 8 is connected to a plurality of second air nozzles 81 arranged at intervals. The bellows 91 is installed on the top of the assembly block 31. An electric blower 93 is installed in the bellows 91. The top of the wind box 91 is provided with an ion blower 93 connected to the inside thereof, the bottom of the wind box 91 is connected to an air guide pipe 94 placed below the assembly block 31, and the first air outlet cover 941 is respectively provided on both sides of the first air outlet cover 941 connected to the inside thereof, and the first air outlet cover 941 is located at a higher position on the air guide pipe 94 than the second air outlet cover 942, the first air outlet cover 941 is connected to the first hot air pipe 7 through the first air supply pipe 943, the second air outlet cover 942 is connected to the second hot air pipe 8 through the second air supply pipe 944, and the air guide pipe 9 4 is inserted with an air guide switching member 95, which includes an air flow block 951, a connecting frame 952, a sealing block 953 and a connecting rod 954. The bottom of the air guide 94 is a through structure. The air flow block 951 and the sealing block 953 are both slidably arranged in the air guide 94, and the air flow block 951 and the sealing block 953 are connected by the connecting frame 952. A through flow passage is provided in the air flow block 951. A connecting rod 954 connected to the fixing seat 61 is installed at the bottom of the sealing block 953. The air flow block 951 and the sealing block 953 have a through structure. There is a first position state and a second position state. When the air passing block 951 and the sealing block 953 are in the first position state, the connecting rod 954 is located above the first air outlet cover 941, and the sealing block 953 blocks the second air outlet cover 942; when the air passing block 951 and the sealing block 953 are in the second position state, the electric push rod 32 drives the fixed seat 61 to move downward, the connecting rod 954 drives the sealing block 953 and the air passing block 951 to move downward, the air passing block 951 blocks the first air outlet cover 941, and the sealing block 953 is located below the second air outlet cover 942.

[0035] Since the aluminum-plastic film has a certain degree of ductility, it is easy to cause wrinkles on the top surface of the aluminum-plastic film during the folding process. Such wrinkles will unfold after heat sealing, resulting in a gap between the aluminum-plastic film and the battery cell, thereby affecting the sealing of the package and the performance of the battery cell. In addition, there may be dust on the surface of the aluminum-plastic film. For this reason, a structure for preheating and dust removal of the aluminum-plastic film surface is designed, as follows: The battery cell wrapped with aluminum plastic film is fixed on the limit drive assembly 4, so that it is placed in the preheating area, and then the wind source can be blown into the wind box 91 through the ion blower 93, and the wind blown into the wind box 91 can be heated by the electric heating rod 92, and the heated hot air enters the air guide 94, and then enters the first air outlet hood 941 through the flow channel opened in the air block 951, and the hot air flows to the following direction: Figure 8As shown, the hot air is then guided into the first hot air pipe 7 along the first air supply pipe 943, and the hot air can be blown toward the aluminum-plastic film fixed on the limit drive assembly 4 through the first air nozzle 71 on the first hot air pipe 7, thereby preheating the aluminum-plastic film. Preheating can soften the polymer material in the aluminum-plastic film, reduce its rigidity, and increase its ductility. Preheating can also release the internal stress in the aluminum-plastic film to a certain extent, so that the material is in a relatively relaxed state. This relaxed state is conducive to reducing the local stress concentration of the material during the rolling process, thereby reducing the probability of wrinkles. In addition, by blowing hot air to the aluminum-plastic film, the fine particles of dust attached to the aluminum-plastic film can be directly discharged through the air passage formed between the shielding assembly 5 and the bottom of the groove, thereby playing a dust removal role and improving the quality of lithium battery processing.

[0036] It should be further explained that, since static electricity is easily generated when rolling the aluminum-plastic film, the aluminum-plastic film after packaging is easy to absorb dust, and in order to improve the effect of rolling the aluminum-plastic film, the structure of the second hot air pipe 8 and the hot air component 9 is proposed, which is as follows: The electric push rod 32 drives the fixed seat 61 to move downward, so that when the pressure roller 64 at the bottom of the rolling strip block 63 presses against the surface of the aluminum-plastic film, the connecting rod 954 connected to the fixed seat 61 drives the sealing block 953 to move downward and open the second air outlet cover 942. When the sealing block 953 moves downward, the air passing block 951 is driven to move downward to block the first air outlet cover 941 through the connecting frame 952. Fig. 9 As shown, the hot air entering the air guide duct 94 immediately enters the second air outlet hood 942 through the flow channel in the air block 951, and then enters the second hot air duct 8 along the second air supply duct 944, and blows the hot air toward the aluminum-plastic film through the second air nozzle 81 at the bottom of the second hot air duct 8. The hot air is blown to the aluminum-plastic film by the pressure roller 64 at the bottom of the rolling strip block 63 when the aluminum-plastic film is rolled, realizing the rolling and blowing action, so that the aluminum-plastic film is always in a dynamic stress balance state during the rolling process. The continuous heating of the hot air can alleviate the stress concentration caused by the rolling, reduce the wrinkles and material damage caused by the sudden stress, and make the aluminum-plastic film smoothly transition under uniform heating and pressure, thereby improving the sealing performance. When the aluminum-plastic film is rolled, static electricity may be generated. Therefore, the air supply source is designed to be an ion fan 93 for air supply. When the ion fan 93 is working, the positive and negative ions generated are accelerated under the action of the electric field force to form a high-speed ion airflow. At the same time, the built-in fan will blow the ion airflow to the surface of the aluminum-plastic film that needs to be destaticized. When the ion airflow contacts the surface of the aluminum-plastic film, the static electricity on the surface of the aluminum-plastic film will be neutralized with the opposite charge in the ion airflow. Specifically, if the surface of the aluminum-plastic film has a positive charge, the negative ions in the airflow will be attracted and combined with it, and vice versa. In this way, the static electricity on the surface of the aluminum-plastic film is effectively eliminated.

[0037] refer to Figure 1 and Fig.10In this embodiment, the shielding component 5 includes a storage box 51, a first rotating shaft 52, a roller 53 and a sealing film 54. The end of the processing seat 3 away from the automatic packaging component 2 is equipped with a storage box 51 located in the preheating area. The inner walls on both sides of the storage box 51 are rotatably connected to the first rotating shaft 52, and a roller 53 is fixedly connected between the two first rotating shafts 52. The sealing film 54 is wound relative to the roller 53. A strip opening is opened on the side of the storage box 51, one end of the sealing film 54 passes through the strip opening and is connected to the assembly block 31, and a coil spring 55 is matched between the first rotating shaft 52 and the sealing film 54.

[0038] When hot air is blown to the aluminum-plastic film fixed on the limit drive assembly 4 through the first hot air pipe 7, a preheating space can be formed in the preheating area through the sealing film 54 on the shielding assembly 5 to prevent the hot air blown to the surface of the aluminum-plastic film from emanating from the top thereof. The sealing film 54 can play a shielding role, and an air passage is formed between the sealing film 54 and the bottom of the groove, so that dust blown to the surface of the aluminum-plastic film can be directly discharged from the air passage; When the assembly block 31 is driven by the driving member to approach the automatic packaging component 2, the sealing film 54 can be pulled out from the roller 53 and unfolded. When the assembly block 31 is away from the automatic packaging component 2, the sealing film 54 can be reset and rewound onto the roller 53 under the action of the winding spring 55.

[0039] refer to Figure 1 and Fig.11 In a specific embodiment, the limit drive assembly 4 includes an electric slide rail 41 and a limit seat 42. An installation groove is provided at the bottom of the groove, and the electric slide rail 41 is installed in the installation groove. The limit seat 42 is installed at the driving end of the electric slide rail 41. A limit groove for limiting the position of the packaged component is provided in the limit seat 42, and the limit groove runs through the side of the limit seat 42 close to the automatic packaging assembly 2.

[0040] When packaging the battery cell wrapped with aluminum-plastic film, it only needs to be placed in the limiting groove opened in the limiting seat 42, so that the pole ear part of the battery cell faces the automatic packaging component 2, and then the aluminum-plastic film can be preheated. After the aluminum-plastic film is preheated, the limiting seat 42 can be transported to the rolling area through the electric slide rail 41. After rolling, the aluminum-plastic film can be packaged by the automatic packaging component 2.

[0041] refer to Figure 1 In a specific embodiment, the driving member includes a second cylinder 35, and slide grooves 34 are provided on both sides of the top of the processing seat 3. Slide blocks 33 are installed at both ends of the assembly block 31. The two slide blocks 33 are respectively slidably matched with the two slide grooves 34. The second cylinder 35 is installed in the slide groove 34. The slide block 33 is connected to the second cylinder 35 and is driven by the second cylinder 35 to slide along the slide groove 34.

[0042] When rolling the aluminum-plastic film, the second cylinder 35 only needs to drive the slide block 33 to slide back and forth along the slide groove 34 provided on the processing seat 3, and the assembly block 31 can drive the rolling assembly 6 to roll the aluminum-plastic film.

[0043] refer to Figure 2 and Figure 3 In a specific embodiment, the automatic packaging component 2 includes an assembly plate 21, a lower head 22, an assembly rack 23, a first cylinder 24 and an upper head 25. The assembly plate 21 is installed on the base 1 and is located at the end of the processing seat 3. The assembly rack 23 is installed on the assembly plate 21, and the first cylinder 24 is installed on the assembly rack 23. The driving end of the first cylinder 24 is connected to the upper head 25, and the lower head 22 located below the upper head 25 is installed on the assembly plate 21.

[0044] It should be noted that: after the aluminum-plastic film is rolled, the area of ​​the battery cell to be packaged wrapped with the aluminum-plastic film is placed between the lower head 22 and the upper head 25, and then the upper head 25 is driven by the first cylinder 24 to approach the lower head 22, so that the area of ​​the aluminum-plastic film to be packaged is pressed between the lower head 22 and the upper head 25, and the aluminum-plastic film is hot-pressed by the lower head 22 and the upper head 25 to achieve the packaging of the aluminum-plastic film of the battery cell.

[0045] A lithium battery aluminum-plastic film packaging process, using the above-mentioned lithium battery aluminum-plastic film automatic packaging device, comprises the following steps: S1. Stamping: According to the size requirements of the battery cell, the corresponding mold is designed to stamp the aluminum-plastic film and form pits on the aluminum-plastic film; S2, loading the battery cell: after loading the battery cell into the aluminum-plastic film pit, fold the aluminum-plastic film in half so that the tab of the battery cell is exposed, and then fix the aluminum-plastic film wrapping the battery cell to the limit drive assembly 4, so that it is placed in the preheating area on the processing seat 3; S3, preheating and dust removal treatment: The hot air is guided to the first hot air duct 7 through the hot air component 9, and the hot air is blown to the aluminum-plastic film in the preheating area through the first hot air duct 7 to achieve the effect of preheating and dust removal. The hot air carries the fine dust particles on the aluminum-plastic film and is discharged through the air passage; S4, rolling process: after the aluminum-plastic film is preheated, the battery cell wrapped with the aluminum-plastic film is transported to the rolling area through the limit drive component 4, the upper tab packaging part of the battery cell is placed at the position of the automatic packaging component 2, and then the rolling component 6 is driven by the electric push rod 32 to move down and press against the surface of the aluminum-plastic film. At this time, the hot air guided by the hot air component 9 to the first hot air pipe 7 is switched to the second hot air pipe 8 to blow toward the aluminum-plastic film, and then the assembly block 31 is driven by the driving member to move toward the automatic packaging component 2. When the assembly block 31 moves, the surface of the aluminum-plastic film is rolled by the rolling component 6, and the hot air blowing of the second hot air pipe 8 cooperates with the rolling of the rolling component 6, so that rolling and blowing can be realized; S5: packaging process, after rolling the aluminum-plastic film on the battery cell, the aluminum-plastic film can be automatically packaged by the automatic packaging component 2.

[0046] Working principle: First, the battery cell wrapped with aluminum plastic film is placed in the limiting groove opened in the limiting seat 42, so that it is placed in the preheating area, and then the wind source can be blown into the wind box 91 through the ion blower 93, and the wind blown into the wind box 91 can be heated by the electric heating rod 92. The heated hot air enters the air guide 94, and then enters the first air outlet cover 941 through the flow channel opened in the air block 951. The hot air flows to Figure 8 As shown, the hot air is then guided along the first air supply pipe 943 to the first hot air pipe 7, and the hot air can be blown to the aluminum-plastic film fixed on the limit drive component 4 through the first air nozzle 71 on the first hot air pipe 7, so as to preheat the aluminum-plastic film. The preheating can soften the polymer material in the aluminum-plastic film, reduce its rigidity, and increase its ductility. In addition, by blowing hot air to the aluminum-plastic film, the fine dust particles attached to the aluminum-plastic film can be directly discharged through the air passage formed between the shielding component 5 and the bottom of the groove, so as to remove dust. After the aluminum-plastic film is preheated, The limiting seat 42 is transported to the rolling area by the electric slide rail 41, and the area to be packaged of the lithium battery is placed between the lower head 22 and the upper head 25. Then, the fixing seat 61 can be driven downward by the electric push rod 32 to make the pressure roller 64 at the bottom of the rolling strip 63 press against the surface of the aluminum-plastic film. When the pressure roller 64 presses against the aluminum-plastic film, the reset rod 621 on the rolling strip 63 is subjected to force and its bottom end rotates with the U-shaped block 622. The second rotating shaft 623 at the top of the reset rod 621 rotates with the inner wall of the opening groove, and the torsion spring 624 connected to the reset rod 621 also rotates. The corresponding deformation occurs, thereby pushing the pressure rollers 64 on both sides of the fixed seat 61 to roll on the aluminum-plastic film and move away from each other. Under the action of the two pressure rollers 64, the surface of the aluminum-plastic film is tightened, and then the slider 33 is driven by the second cylinder 35 to slide back and forth along the slide groove 34 opened on the processing seat 3, and the rolling assembly 6 can be driven by the assembly block 31 to move as a whole. The pressure roller 64 at the bottom of the rolling strip block 63 can roll the surface of the aluminum-plastic film, thereby flattening the aluminum-plastic film to prevent wrinkles when the aluminum-plastic film is packaged. When packaging lithium batteries, The pressing roller 64 at the bottom of the rolling strip block 63 can be pressed on the top area of ​​the lithium battery packaging position. By applying a resisting pressure on the upper part, the pressure distribution in the pressing area can be made more uniform. Then, the upper sealing head 25 is driven by the first cylinder 24 to approach the lower sealing head 22, so that the area to be packaged of the aluminum-plastic film is pressed between the lower sealing head 22 and the upper sealing head 25. The aluminum-plastic film is hot-pressed by the lower sealing head 22 and the upper sealing head 25 to realize automatic packaging of the aluminum-plastic film of the battery cell. After the lithium battery is packaged, it can be taken down from the limiting seat 42 to package the next lithium battery.

[0047] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A lithium battery aluminum-plastic film automatic packaging device, comprising a base (1), an automatic packaging component (2) and a processing seat (3), characterized in that: The automatic packaging component (2) and the processing seat (3) are sequentially mounted on the base (1); a groove is provided in the processing seat (3), and a preheating area and a rolling area are sequentially arranged in the groove; a limiting driving component (4) is provided in the groove for limiting the position of the component to be packaged and transporting it from the preheating area to the rolling area; the component to be packaged located in the rolling area is packaged by the automatic packaging component (2); The processing seat (3) is provided with an assembly block (31) and a driving member for driving the assembly block (31) to move toward the automatic packaging assembly (2); the assembly block (31) is provided with a roller pressing assembly (6) located below it and an electric push rod (32) for driving the roller pressing assembly (6) to move up and down; the roller pressing assembly (6) is provided with a first hot air pipe (7) arranged toward the preheating area; a second hot air pipe (8) is provided at the bottom of the roller pressing assembly (6); and the assembly block (31) is provided with a hot air assembly (9) for supplying hot air to the first hot air pipe (7) and the second hot air pipe (8) and switching the hot air path; The processing seat (3) is provided with a shielding component (5) connected to the assembly block (31) and located above the preheating area, wherein the shielding component (5) forms an air passage between the preheating area and the bottom of the groove.

2. The automatic packaging device for aluminum-plastic film of lithium battery according to claim 1, characterized in that: The rolling assembly (6) comprises a fixed seat (61), an elastic reset member (62), a rolling strip (63) and a pressure roller (64); the fixed seat (61) is connected to the driving end of the electric push rod (32); rolling strips (63) are installed on both sides of the bottom of the fixed seat (61) via the elastic reset member (62); an active chamber is provided at the bottom of the rolling strip (63); a pressure roller (64) is arranged in the active chamber at the bottom of the rolling strip (63); and two ends of the pressure roller (64) are rotatably connected to the inner walls of the rolling strip (63) at both ends.

3. The automatic packaging device for aluminum-plastic film of lithium battery according to claim 2, characterized in that: The elastic reset member (62) comprises a reset rod (621), a U-shaped block (622), a second rotating shaft (623) and a torsion spring (624). Open grooves are provided on both sides of the bottom of the rolling assembly (6). The U-shaped block (622) is mounted on the rolling block (63). The two ends of the reset rod (621) are respectively located in the open groove and the U-shaped block (622). The reset rod (621) is inclined from the side of the fixed seat (61) to the side of the rolling block (63). The bottom end of the rod (621) is rotatably matched with the U-shaped block (622); second rotating shafts (623) are installed on both sides of the top end of the reset rod (621); the ends of the two second rotating shafts (623) away from the reset rod (621) are respectively rotatably connected to the inner walls of the two sides of the opening groove; the two second rotating shafts (623) are sleeved with torsion springs (624); the two ends of the two torsion springs (624) are respectively connected to the two sides of the reset rod (621) and the inner walls of the two sides of the opening groove.

4. The automatic packaging device for aluminum-plastic film of lithium battery according to claim 3, characterized in that: The hot air assembly (9) comprises a wind box (91), an electric heating rod (92), an ion blower (93), an air guide pipe (94) and an air guide switching member (95); the first hot air pipe (7) is mounted on the side of the roller assembly (6); the first hot air pipe (7) is connected to a plurality of first air nozzles (71) arranged toward the bottom of the preheating area; an open groove is provided at the bottom of the roller assembly (6); the second hot air pipe (8) is mounted in the open groove; the bottom of the second hot air pipe (8) is connected to a plurality of second air nozzles (81) arranged at intervals; the wind box (91) is mounted on the top of the assembly block (31); the electric heating rod (92) is installed in the wind box (91); the wind box (91) is connected to the first hot air pipe (71) and the first hot air nozzles (71) are arranged toward the bottom of the preheating area; the roller assembly (6) is provided with an open groove; the second hot air pipe (8) is mounted in the open groove; the bottom of the second hot air pipe (8) is connected to a plurality of second air nozzles (81) arranged at intervals; An ion fan (93) connected to the interior of the box (91) is installed on the top of the box (91); the bottom of the wind box (91) is connected to an air guide pipe (94) placed below the assembly block (31); first air outlet covers (941) connected to the interior of the box are installed on both sides of the first air outlet cover (941), respectively; the first air outlet cover (941) is located higher than the second air outlet cover (942) on the air guide pipe (94); the first air outlet cover (941) is connected to the first hot air pipe (7) through the first air supply pipe (943); the second air outlet cover (942) is connected to the second hot air pipe (8) through the second air supply pipe (944); and an air guide switching component (95) is inserted into the air guide pipe (94).

5. The automatic packaging device for aluminum-plastic film of lithium battery according to claim 4, characterized in that: The air guide switching member (95) comprises an air flow block (951), a connecting frame (952), a sealing block (953) and a connecting rod (954); the bottom of the air guide pipe (94) is a through structure; the air flow block (951) and the sealing block (953) are both slidably arranged in the air guide pipe (94); the air flow block (951) and the sealing block (953) are connected via the connecting frame (952); a through flow passage is provided in the air flow block (951); and a connecting rod (954) connected to a fixing seat (61) is installed at the bottom of the sealing block (953); The air passing block (951) and the sealing block (953) have a first position state and a second position state. When the air passing block (951) and the sealing block (953) are in the first position state, the connecting rod (954) is located above the first air outlet cover (941), and the sealing block (953) blocks the second air outlet cover (942). When the air passing block (951) and the sealing block (953) are in the second position state, the electric push rod (32) drives the fixing seat (61) to move downward, the connecting rod (954) drives the sealing block (953) and the air passing block (951) to move downward, the air passing block (951) blocks the first air outlet cover (941), and the sealing block (953) is located below the second air outlet cover (942).

6. The automatic packaging device for aluminum-plastic film of lithium battery according to claim 5, characterized in that: The shielding component (5) comprises a storage box (51), a first rotating shaft (52), a roller (53) and a sealing film (54); the storage box (51) located in the preheating area is installed at one end of the processing seat (3) away from the automatic packaging component (2); the inner walls on both sides of the storage box (51) are rotatably connected to the first rotating shaft (52); the roller (53) is fixedly connected between the two first rotating shafts (52); the sealing film (54) is wound relative to the roller (53); a strip opening is opened on the side of the storage box (51); one end of the sealing film (54) passes through the strip opening and is connected to the assembly block (31); and a coil spring (55) is provided between the first rotating shaft (52) and the sealing film (54).

7. The automatic packaging device for aluminum-plastic film of lithium battery according to claim 6, characterized in that: The limit drive assembly (4) comprises an electric slide rail (41) and a limit seat (42); a mounting groove is provided at the bottom of the groove, the electric slide rail (41) is installed in the mounting groove, a limit seat (42) is installed at the driving end of the electric slide rail (41), a limit groove for limiting the position of the packaged component is provided in the limit seat (42), and the limit groove passes through a side of the limit seat (42) close to the automatic packaging assembly (2).

8. The automatic packaging device for aluminum-plastic film of lithium battery according to claim 7, characterized in that: The driving member comprises a second cylinder (35), and slide grooves (34) are provided on both sides of the top of the processing seat (3). Slide blocks (33) are installed at both ends of the assembly block (31), and the two slide blocks (33) are respectively slidably matched with the two slide grooves (34). The second cylinder (35) is installed in the slide groove (34), and the slide block (33) is connected to the second cylinder (35) and driven by the second cylinder (35) to slide along the slide groove (34).

9. The automatic aluminum-plastic film packaging device for lithium batteries according to claim 8, characterized in that: The automatic packaging assembly (2) comprises an assembly plate (21), a lower sealing head (22), an assembly rack (23), a first cylinder (24) and an upper sealing head (25); the assembly plate (21) is mounted on the base (1) and is located at the end of the processing seat (3); the assembly rack (23) is mounted on the assembly plate (21); the first cylinder (24) is mounted on the assembly rack (23); the driving end of the first cylinder (24) is connected to the upper sealing head (25); and the lower sealing head (22) located below the upper sealing head (25) is mounted on the assembly plate (21).

10. A lithium battery aluminum-plastic film packaging process, using the lithium battery aluminum-plastic film automatic packaging device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Stamping: According to the size requirements of the battery cell, the corresponding mold is designed to stamp the aluminum-plastic film and form pits on the aluminum-plastic film; S2, inserting the battery cell: after inserting the battery cell into the recess of the aluminum-plastic film, fold the aluminum-plastic film in half so that the tab of the battery cell is exposed, and then fix the aluminum-plastic film wrapping the battery cell to the limit drive assembly (4), so that it is placed in the preheating area on the processing seat (3); S3, preheating and dust removal treatment: hot air is directed to the first hot air duct (7) through the hot air component (9), and the hot air is blown toward the aluminum-plastic film in the preheating area through the first hot air duct (7) to achieve the effect of preheating and dust removal, and the hot air carries fine dust particles on the aluminum-plastic film and is discharged through the air passage; S4, rolling process: after the aluminum-plastic film is preheated, the battery cell wrapped with the aluminum-plastic film is transported to the rolling area through the limit drive component (4), the upper tab packaging part of the battery cell is placed at the position of the automatic packaging component (2), and then the rolling component (6) is driven downward by the electric push rod (32) to press against the surface of the aluminum-plastic film. At this time, the hot air guided into the first hot air pipe (7) by the hot air component (9) is switched to the second hot air pipe (8) to blow toward the aluminum-plastic film, and then the assembly block (31) is driven by the driving member to move toward the automatic packaging component (2). When the assembly block (31) moves, the surface of the aluminum-plastic film is rolled by the rolling component (6), and the hot air blown by the second hot air pipe (8) cooperates with the rolling of the rolling component (6) to achieve rolling and blowing; S5, packaging process: After rolling the aluminum-plastic film on the battery cell, the aluminum-plastic film can be automatically packaged by an automatic packaging component (2).

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