End socket capable of reducing packaging wrinkles of aluminum plastic film

Abstract

The utility model relates to the technical field of lithium ion packaging, in particular to a sealing head capable of reducing packaging wrinkles of an aluminum plastic film, which comprises bottom plates which are of plate-shaped structures, are distributed at intervals and are symmetrically arranged, and a blocky upper sealing head and a blocky lower sealing head are fixed on opposite side surfaces of the two bottom plates. A plurality of telescopic limiting devices distributed at intervals are further arranged on the side face, adjacent to the upper sealing head and the lower sealing head, of the bottom plate, and pressing plates are fixedly connected to the surface of the end, far away from the upper sealing head, of the telescopic limiting device fixed to the upper sealing head and the surface of the end, far away from the lower sealing head, of the telescopic limiting device fixed to the lower sealing head correspondingly. The utility model relates to a flattening device for a soft package battery core, which solves the problems of liquid leakage or poor insulation and the like of the soft package battery core due to the fact that a device in the prior art is not provided with a flattening device, and when two layers of aluminum plastic films are staggered or one layer of aluminum plastic film is deformed, the packaged aluminum plastic film is extremely easy to wrinkle, and further the problems of liquid leakage or poor insulation and the like of the soft package battery core are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion packaging, in particular to a sealing head capable of reducing wrinkles of aluminum-plastic film packaging. Background Art

[0002] As portable electronic devices develop towards being lightweight and smart, lithium-ion cells are usually packaged with aluminum-plastic film. The packaging process of soft-pack lithium-ion batteries includes winding, forming, heat-sealing one edge, top-sealing, filling, pre-charging, secondary sealing, trimming and capacity division. Among them, top-sealing is performed at the tab. The top-sealing is achieved by butting and pressing the upper and lower heads to heat-seal the packaging film at the tab.

[0003] The shell of the soft-pack battery is an aluminum-plastic film shell, which is a widely used battery. The aluminum-plastic film shell is generally encapsulated with an upper head and a lower head made of heat-conducting material. During encapsulation, the upper head and the lower head are heated to a certain temperature respectively. The encapsulation edge of the aluminum-plastic film shell of the soft-pack battery that is currently to be encapsulated (which can be but is not limited to the side edge, the bottom edge or the top edge with the pole ear extending) is placed on the encapsulation surface of the lower head, and the upper head is pressed down so that the encapsulation surfaces of the upper head and the lower head are closed up and down and pressed against the two surfaces of the encapsulation edge. The pp layer on the surface of the aluminum-plastic film that was originally separated at the encapsulation edge is hot-melted and fused together to achieve the sealing of the encapsulation edge. The edges of the aluminum-plastic film shell are encapsulated respectively, and the encapsulation of the aluminum-plastic film shell is achieved.

[0004] In the existing packaging device, since the sealing head does not have a smoothing device, when there is a misalignment between the two layers of aluminum-plastic film or one layer of the aluminum-plastic film is deformed, it is very easy to cause wrinkles in the aluminum-plastic film after packaging. The existence of wrinkles means that the packaging of the aluminum-plastic film is uneven in different areas. The compression rate of the PP layer in the concave part is high, and the compression rate of the convex part is low, which is easy to cause problems such as leakage of soft-pack batteries or poor insulation. Utility Model Content

[0005] The utility model provides a sealing head for reducing wrinkles of aluminum-plastic film packaging, which solves the problem that in the prior art device, there is no smoothing device, when there is a misalignment between two layers of aluminum-plastic film or one layer of the aluminum-plastic film is deformed, it is very easy to cause wrinkles in the packaged aluminum-plastic film, thereby causing problems such as leakage of soft-pack battery cells or poor insulation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A head for reducing wrinkles in aluminum-plastic film packaging comprises a bottom plate, which is a plate-like structure and is distributed at intervals and symmetrically placed. A block-shaped upper head and a lower head are fixed on opposite sides of the two bottom plates. A plurality of spaced-apart telescopic limit devices are also provided on the sides of the bottom plates adjacent to the upper head and the lower head. A pressure plate is respectively connected and fixed to a surface of the telescopic limit device fixed on the upper head that is farther from one end of the upper head and a surface of the telescopic limit device fixed on the lower head that is farther from one end of the lower head.

[0008] Preferably, the telescopic limit device is evenly spaced and fixed on the base plate, and the telescopic limit device includes a cylindrical hydraulic column and a rod-shaped hydraulic rod, the diameter of the hydraulic column is larger than the hydraulic rod, one end of the hydraulic column is fixed on the base plate, and a hydraulic rod is fixed inside the hydraulic column, and the hydraulic rod can slide up and down along the hydraulic column with damping.

[0009] Preferably, the telescopic limiting device further comprises a pressure plate, which is a long thin plate structure, and one surface of the pressure plate is connected to an end of the hydraulic rod away from the bottom plate, and the pressure plate is connected and fixed to a plurality of hydraulic rods.

[0010] Preferably, the telescopic limit device also includes a spring, the diameter of the spring matches the hydraulic column and is sleeved on the hydraulic column. When the spring is sleeved on the hydraulic column, one end of the spring is fixed on the base plate and the other end is fixed on the pressure plate, and the spring has elastic force.

[0011] Preferably, there are two bottom plates, and upper and lower heads are provided on opposite sides of the bottom plates, which are parallel and on the same axis. The number of telescopic limit devices provided on the bottom plate with the upper head and the bottom plate with the lower head is the same, and they correspond one to one.

[0012] Preferably, the pressing plate close to the upper head and the pressing plate close to the lower head are parallel to and overlap each other, two layers of aluminum-plastic film are accommodated between the two pressing plates, and the two pressing plates can move toward each other along the hydraulic column and adhere to each other and press the aluminum-plastic film.

[0013] Preferably, the telescopic limit device has a height lower than the corresponding upper head or lower head in a natural state, and a height greater than the corresponding upper head or lower head when the telescopic limit device is extended.

[0014] Preferably, the pressing plate is made of metal or plastic material with a smooth surface.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model adds a retractable limiting pressure block, which can smooth and press the area of ​​the aluminum-plastic film to be packaged in advance before heating and pressurizing the aluminum-plastic film, and maintains pressure on the aluminum-plastic film during the entire packaging process, thereby reducing the misalignment and deformation between the two layers of aluminum-plastic film during the packaging process. Since the pressure blocks are located on both sides of the sealing head, the movement or deformation of the aluminum-plastic film in the surrounding unsealed area during the packaging process can reduce the influence of pulling on the sealing area, etc., which can effectively improve the generation of aluminum-plastic film packaging wrinkles and reduce the risks of battery cell leakage and short circuit.

[0017] The utility model only needs to modify the head module, and no additional control device is required, so the cost is low and the logistics line and other sections of the battery cell assembly are not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view schematic diagram of the head module structure of Example 1 of the utility model.

[0019] Figure 2 This is a schematic diagram of the state of Example 1 of the utility model when it starts working.

[0020] Figure 3 This is a schematic diagram of the state of Example 1 of the utility model when it is working.

[0021] Figure 4 This is a schematic diagram of the state of Example 1 of the utility model when the work is completed.

[0022] Figure 5 It is a front view schematic diagram of the head module structure of Example 2 of the utility model.

[0023] In the figure: bottom plate 1, upper head 2, telescopic limit device 3, hydraulic column 3.1, hydraulic rod 3.2, spring 3.3, pressure plate 4, lower head 5, aluminum-plastic film 6. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the existing packaging device, since there is no smoothing device in the device of the prior art, when there is a misalignment between the two layers of aluminum-plastic film or one of the layers of aluminum-plastic film is deformed, it is very easy to cause the problem of wrinkles in the aluminum-plastic film after packaging. The wrinkles mean that the packaging of the aluminum-plastic film is uneven in different areas, the compression rate of the PP layer in the concave part is high, and the compression rate of the convex part is low, which leads to problems such as leakage of soft-pack battery cells or poor insulation. In order to solve the above problems, the present embodiments 1 and 2 are provided. The present embodiments 1 and 2 include a bottom plate 1, an upper head 2, a telescopic limit device 3, a hydraulic column 3.1, a hydraulic rod 3.2, a spring 3.3, a pressure plate 4, a lower head 5, and an aluminum-plastic film 6.

[0026] Reference Figures 1 to 4 For this embodiment 1, refer to Figure 1 It is a front view schematic diagram of the head module structure of this embodiment 1. This embodiment 1 is a head for reducing aluminum-plastic film packaging wrinkles, including a base plate 1, which is a plate-like structure and is distributed at intervals and symmetrically placed. Block-shaped upper head 2 and lower head 5 are fixed on the opposite sides of the two base plates 1. A number of spaced-apart telescopic limit devices 3 are also arranged on the side of the base plate 1 adjacent to the upper head 2 and the lower head 5. The surface of the telescopic limit device 3 fixed on the upper head 2 is far from one end of the upper head 2 and the surface of the telescopic limit device 2 fixed on the lower head 5 is far from one end of the lower head 5 are respectively connected and fixed with a pressure plate 4. The base plate 1, the upper head 2 and the telescopic limit device 3 are combined to form an upper head module, and the base plate 1, the lower head 5 and the telescopic limit device 3 constitute a lower head module.

[0027] The design of the head greatly affects the quality of aluminum-plastic film packaging, especially the generation of wrinkles. To address this issue, this article introduces a head design that reduces wrinkles in aluminum-plastic film packaging. The head is mainly composed of a bottom plate 1, an upper head 2, a lower head 5, and a telescopic limit device 3. The bottom plate 1 is a plate-like structure, which is distributed at intervals and placed symmetrically. On the opposite sides of the two bottom plates 1, a block-shaped upper head 2 and a lower head 5 are fixed. This design enables the head to evenly distribute pressure during the packaging process and reduce the possibility of wrinkles.

[0028] In order to further improve the performance of the head, a plurality of spaced apart telescopic limit devices 3 are provided on the side of the bottom plate 1 adjacent to the upper head 2 and the lower head 5. In practical applications, the aluminum-plastic film may be deformed due to factors such as temperature and pressure during the packaging process, and the telescopic limit device 3 can effectively limit such deformation, thereby reducing the generation of wrinkles. In addition, the telescopic limit device 3 fixed on the upper head 2 is farther from the surface of one end of the upper head 2, and the telescopic limit device 2 fixed on the lower head 5 is farther from the surface of one end of the lower head 5, and a pressure plate 4 is respectively connected and fixed. This design not only ensures the stability of the head, but also reduces unnecessary damage to the aluminum-plastic film during the packaging process.

[0029] In practical applications, the head can be designed and adjusted accordingly according to the specifications, thickness and packaging requirements of the aluminum-plastic film. This head design can not only improve the quality of aluminum-plastic film packaging and reduce the generation of wrinkles, but also improve production efficiency and reduce production costs.

[0030] Reference Figure 1 , which is a front view schematic diagram of the head module structure of the present embodiment 1, wherein there are two bottom plates 1, and an upper head 2 and a lower head 5 are provided on opposite sides of the bottom plate 1 in parallel and on the same axis. The bottom plate 1 with the upper head 2 and the bottom plate 1 with the lower head 5 are provided with the same number of telescopic limit devices 3, and the upper and lower ones correspond to each other. In the present embodiment, only pressing plates 4 of different thicknesses or shapes need to be equipped to meet the needs of different battery cells, without the need to equip multiple battery cells with multiple heads, which is beneficial to reducing the mold cost of the head.

[0031] The material of the bottom plate 1 can be selected from high-strength, wear-resistant materials, such as stainless steel, aluminum alloy, etc., to ensure the durability and stability of the bottom plate. The inner surface of the bottom plate 1 should be flat and smooth to reduce the friction loss of the battery cell during transportation.

[0032] The design of the upper head 2 and the lower head 5 should take into account the size and shape differences of the battery cells, as well as the ease of operation of the battery cells during assembly and disassembly. The material of the upper head 2 and the lower head 5 can be the same as that of the bottom plate 1, or other suitable materials such as plastic, rubber, etc. can be selected.

[0033] The function of the telescopic limit device 3 is to limit the movement range of the battery cell on the bottom plate 1 to ensure the stability of the battery cell during transportation. The design of the telescopic limit device 3 should take into account the size and shape differences of the battery cell to achieve adaptability to various battery cells. The material of the telescopic limit device 3 can be selected from materials with good elasticity and tensile strength such as springs and rubber.

[0034] The design of the pressing plate 4 should be adjusted according to the thickness and plane shape of different battery cells to achieve effective compression of the battery cells. The material of the pressing plate 4 can be selected from hard, wear-resistant materials such as stainless steel, aluminum alloy, etc. The pressure between the pressing plate 4 and the bottom plate 1 can be adjusted according to the characteristics of the battery cells and transportation requirements to ensure the safety of the battery cells during transportation.

[0035] The pressing plate 4 close to the upper end cap 2 and the pressing plate 4 close to the lower end cap 5 are parallel to and overlap each other, and two layers of aluminum-plastic film 6 are accommodated between the two pressing plates 4. The two pressing plates 4 can move toward each other along the hydraulic column 3.1 and fit each other and press the aluminum-plastic film 6. The gap between the two ends caps is narrow to adapt to the current thin aluminum-plastic film seal, and there is no need to replace the entire end cap, which is more convenient to replace and is conducive to improving work efficiency.

[0036] The telescopic limit device 3 has a height lower than the corresponding upper or lower head in a natural state, and a height higher than the corresponding upper or lower head when the telescopic limit device is extended.

[0037] In this embodiment, the pressing plate is made of metal or plastic material with a smooth surface. The design of the pressing plate is to achieve efficient and stable working performance, so the material selection is very important. In this embodiment, a metal or plastic material with a smooth surface is selected as the pressing plate material, which has excellent performance advantages. Metal materials have good hardness, strength and wear resistance, can withstand greater pressure and friction, and are suitable for high-intensity working environments. Plastic materials have the characteristics of light weight, corrosion resistance, anti-static, etc., and are suitable for occasions with special requirements on weight and electromagnetic interference.

[0038] Reference Figure 2 , Figure 3 , Figure 4 The schematic diagram of the working process of the present embodiment 1 shows that the telescopic limit device 3 is evenly distributed and fixed on the bottom plate 1, and the telescopic limit device 3 includes a cylindrical hydraulic column 3.1 and a rod-shaped hydraulic rod 3.2. The diameter of the hydraulic column is larger than the hydraulic rod. One end of the hydraulic column is fixed on the bottom plate, and a hydraulic rod is fixed inside the hydraulic column. The hydraulic rod can slide up and down along the hydraulic column with damping. In the present embodiment, the telescopic limit device adopts a hydraulic telescopic motion mechanism, but the present embodiment is not limited to this motion mechanism, and a pneumatic motion mechanism can also be adopted according to the use environment.

[0039] In addition to the above-mentioned hydraulic telescopic motion mechanism, an electric telescopic motion mechanism can also be used. This electric telescopic motion mechanism includes an electric drive device on the base plate 1 and a telescopic rod 4 connected to the base plate 1. The electric drive device can be a motor or a servo motor, which drives the telescopic rod 4 to achieve the telescopic limit function. This motion mechanism has the advantages of high control accuracy and fast response speed, and is suitable for occasions with high requirements for telescopic limit.

[0040] The telescopic limiting device also includes a pressing plate 4, which is a long thin plate structure, and one surface of the pressing plate is connected to an end of the hydraulic rod away from the bottom plate, and the pressing plate is connected and fixed to a plurality of hydraulic rods.

[0041] The telescopic limit device also includes a spring 3.3, the diameter of which matches the hydraulic column and is sleeved on the hydraulic column 3.1. When the spring is sleeved on the hydraulic column, one end of the spring is fixed on the base plate 1 and the other end is fixed on the pressure plate 4, and the spring 3.3 has elastic force.

[0042] The following is the working process of this embodiment:

[0043] Figure 3 This is a schematic diagram of the state when the work of this embodiment 1 starts. In the figure, the telescopic limit device is changed from a normal state to an extended state, the hydraulic rod is moved by the hydraulic cylinder to the side farther than the bottom plate, and the hydraulic rod drives the pressure plate thereon to move to the side farther than the bottom plate. There is a gap between the pressure plate corresponding to the upper head and the pressure plate corresponding to the lower head, and the upper and lower layers of aluminum-plastic film to be sealed are placed on the pressure plate of the lower head.

[0044] Figure 4 This is a schematic diagram of the state of Example 1 during operation. In the figure, the lower head is fixed, the upper head is lowered, and the telescopic limit device of the upper head continues to extend in a direction away from the bottom plate. The pressure plate on the telescopic limit device of the upper head first contacts the aluminum-plastic film. At the same time, as the upper head module descends, the force applied by the pressure block to the aluminum-plastic film gradually increases, gradually smoothing and pressing the upper and lower layers of the aluminum-plastic film.

[0045] The above process helps to improve the generation of wrinkles in the aluminum-plastic film packaging of soft-pack batteries and reduce the risks of battery leakage and short circuit.

[0046] Figure 5 This is a schematic diagram of the state when the work of this embodiment 1 is completed. In the figure, the upper head module continues to descend, and the head contacts the aluminum-plastic film, heating and pressurizing the upper and lower layers of the aluminum-plastic film. During this process, the briquetting device continues to maintain pressure on the aluminum-plastic film. After the two layers of the aluminum-plastic film are fully melted and bonded, the upper head module is lifted and the aluminum-plastic film is taken out.

[0047] Reference Figure 5 This is Embodiment 2, which is a head for reducing wrinkles of aluminum-plastic film packaging, including two bottom plates 2, both of which are plate-like structures and are spaced and symmetrically placed. Block-shaped and mutually symmetrical upper heads 3 and lower heads 5 are fixed on opposite sides of the two bottom plates. A number of spaced-apart telescopic limit devices 3 are arranged on the bottom plates 1 on both sides of the upper head 2 and on the bottom plates 1 on both sides of the corresponding lower head 5. There are two rows of telescopic limit devices 3 on the bottom plate 1 with the upper head 2, which are symmetrical to each other, and telescopic limit devices 3 are also arranged on the bottom plate with the lower head, which correspond one by one to the telescopic limit devices 3 on the bottom plate with the upper head, and the surface of the telescopic limit device fixed on the upper head farther from one end of the upper head and the surface of the telescopic limit device fixed on the lower head farther from one end of the lower head are respectively connected and fixed with pressure plates, and there are 4 pressure plates, which are symmetrical in pairs.

[0048] In this embodiment 2, based on the embodiment 1, telescopic limiting devices are added on both sides of the original head, so as to further reduce the misalignment and deformation between the two layers of aluminum-plastic film during the packaging process.

[0049] The beneficial effects of embodiments 1 and 2 are as follows: embodiments 1 and 2 add one or more retractable limiting pressure blocks, and before heating and pressurizing the aluminum-plastic film, the aluminum-plastic film is smoothed and pressed in advance near the area to be encapsulated, and the pressure on the aluminum-plastic film is maintained during the entire encapsulation process, thereby reducing the misalignment and deformation between the two layers of aluminum-plastic film during the encapsulation process. Since the pressure blocks are located on both sides of the sealing head, the movement or deformation of the aluminum-plastic film in the surrounding unsealed area during the encapsulation process can reduce the pulling effect on the sealing area, thereby effectively improving the generation of wrinkles in the aluminum-plastic film package and reducing the risk of battery cell leakage and short circuit.

[0050] Secondly, in both embodiments 1 and 2, only the end cap module needs to be modified, and no additional control device needs to be added, so the cost is low and there is no impact on the logistics line and other sections of the battery cell assembly.

[0051] The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A head for reducing wrinkles in aluminum-plastic film packaging, characterized in that: It includes a bottom plate, which is a plate-like structure and is distributed at intervals and symmetrically placed. Block-shaped upper heads and lower heads are fixed on the opposite sides of the two bottom plates. A number of telescopic limit devices are also arranged at intervals on the sides of the bottom plate adjacent to the upper head and the lower head. The surface of the telescopic limit device fixed on the upper head that is farther from one end of the upper head and the surface of the telescopic limit device fixed on the lower head that is farther from one end of the lower head are respectively connected and fixed with pressure plates.

2. A sealing head for reducing wrinkles of aluminum-plastic film packaging according to claim 1, characterized in that: The telescopic limit device is evenly distributed and fixed on the base plate, and the telescopic limit device includes a cylindrical hydraulic column and a rod-shaped hydraulic rod. The diameter of the hydraulic column is larger than the hydraulic rod. One end of the hydraulic column is fixed on the base plate, and a hydraulic rod is fixed inside the hydraulic column. The hydraulic rod can slide up and down along the hydraulic column with damping.

3. The sealing head for reducing wrinkles of aluminum-plastic film packaging according to claim 1, characterized in that: The telescopic limiting device also includes a pressing plate, which is a long thin plate structure, and one surface of the pressing plate is connected to an end of the hydraulic rod away from the bottom plate, and the pressing plate is connected and fixed to a plurality of hydraulic rods.

4. The sealing head for reducing wrinkles of aluminum-plastic film packaging according to claim 1, characterized in that: The telescopic limit device also includes a spring, the diameter of which matches the hydraulic column and is sleeved on the hydraulic column. When the spring is sleeved on the hydraulic column, one end of the spring is fixed on the bottom plate and the other end is fixed on the pressure plate, and the spring has elastic force.

5. A sealing head for reducing wrinkles of aluminum-plastic film packaging according to claim 1 or 2, characterized in that: There are two bottom plates, and upper heads and lower heads are arranged on opposite sides of the bottom plates, which are parallel and on the same axis. The bottom plate with the upper head and the bottom plate with the lower head have the same number of telescopic limit devices, and they correspond one to another.

6. The sealing head for reducing wrinkles of aluminum-plastic film packaging according to claim 1, characterized in that: The pressing plate close to the upper head and the pressing plate close to the lower head are parallel and overlapped with each other, and two layers of aluminum-plastic films are accommodated between the two pressing plates. The two pressing plates can move toward each other along the hydraulic column and adhere to each other and press the aluminum-plastic film.

7. A sealing head for reducing wrinkles of aluminum-plastic film packaging according to claim 1, 2, 3 or 4, characterized in that: The telescopic limit device has a height lower than the corresponding upper or lower head in a natural state, and a height greater than the corresponding upper or lower head when the telescopic limit device is extended.

8. A sealing head for reducing wrinkles of aluminum-plastic film packaging according to claim 1, 3, 4 or 6, characterized in that: The pressing plate is made of metal or plastic material with a smooth and flat surface.

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