A pressure maintaining mechanism for lithium battery insulation film

Abstract

The utility model discloses a kind of lithium battery insulation film pressure maintaining mechanism, including the positioning blocking device and pressure maintaining device of setting total fixed plate, pressure maintaining device one side is provided with positioning blocking device, the positioning blocking device includes backing plate, jacking fixed frame, guide pillar, guide bushing, blocking cylinder, blocking block, limit cylinder, limit block, conveyer belt and tray carrier, jacking fixed frame two sides are respectively fixed with blocking cylinder and limit cylinder, the cylinder rod of blocking cylinder is connected with blocking block, blocking block cooperates with the one end of tray carrier on conveyer belt, the cylinder rod of limit cylinder is connected with limit block, limit block cooperates with the other end of tray carrier. The utility model is through accurate positioning and pressure maintaining processing, effectively eliminates insulation film bubble and wrinkle, enhances bonding strength, improves battery appearance quality, safety and long-term reliability, satisfies high-end application demand.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery manufacturing, specifically to a lithium battery insulating film pressure holding mechanism. Background Technology

[0002] With the rapid development of new energy vehicles, smart devices, and energy storage technologies, lithium batteries, as a core component of energy storage, are widely used in various products. In particular, pouch lithium batteries have become a mainstream choice due to their high energy density, light weight, and small size. However, with the increasing market demand for lithium batteries, battery manufacturing processes and quality control are facing increasingly severe challenges, especially in terms of battery safety and reliability. How to effectively prevent safety issues such as short circuits, electrolyte leakage, and thermal runaway during battery use has become a key technical problem that the industry urgently needs to solve.

[0003] In the production of pouch lithium batteries, the aluminum-plastic film is a key material constituting the battery casing. Its structure typically includes an aluminum layer and a polymer layer, with the aluminum layer being conductive. If the positive or negative electrode tabs (electrode leads) or electrode edges inside the battery directly contact the aluminum layer of the aluminum-plastic film, it may cause an internal short circuit, leading to battery failure, and in severe cases, even thermal runaway or combustion. Therefore, to prevent the risk of short circuits, an insulating film (such as polyimide tape, PET film, etc.) is usually attached to the tabs or electrode edges to effectively isolate the electrodes from the conductive layer of the aluminum-plastic film, ensuring battery safety.

[0004] Nevertheless, the aluminum-plastic film encapsulation process used in the production of pouch batteries can lead to damage to the sealed edges due to mechanical stress, thermal deformation, or electrolyte corrosion. This can affect the battery's seal, resulting in electrolyte leakage or decreased battery performance. Therefore, the insulating film coverage not only needs to effectively isolate the electrodes and the aluminum-plastic film but also needs to enhance the protection of the sealed area to prevent any potential leakage during the battery encapsulation process.

[0005] However, in actual production, the bonding process of the insulating film still has certain problems, especially in the bonding process between the film and the aluminum-plastic film or the tabs. Incomplete bonding often occurs, manifesting as defects such as bubbles and wrinkles. These defects not only affect the appearance quality of the battery but may also lead to weak adhesion between the insulating film and the aluminum-plastic film, thereby increasing the risk of battery failure and even potentially causing electrolyte leakage. This affects the long-term reliability and safety of the battery. Therefore, how to solve the bonding problem between the film and the battery casing (aluminum-plastic film) or tabs in the lithium battery production process, especially in the bonding process of the insulating film, and eliminate defects such as bubbles and wrinkles to ensure the integrity and adhesion strength of the film, has become crucial to improving the performance and reliability of pouch lithium batteries. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a lithium battery insulating film pressure-holding mechanism. Through precise positioning and pressure-holding treatment, it effectively eliminates air bubbles and wrinkles in the insulating film, enhances adhesion strength, improves battery appearance quality, safety, and long-term reliability, and meets the needs of high-end applications.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a lithium battery insulating film pressure holding mechanism, comprising a positioning blocking device and a pressure holding device on a main fixing plate. The positioning blocking device is provided on one side of the pressure holding device. The positioning blocking device includes a pad, a lifting fixing frame, a guide post, a guide sleeve, a blocking cylinder, a blocking block, a limiting cylinder, a limiting block, a conveyor belt, and a tray carrier. The blocking cylinder and the limiting cylinder are respectively fixed on both sides of the lifting fixing frame. The cylinder rod of the blocking cylinder is connected to the blocking block, and the blocking block cooperates with one end of the tray carrier on the conveyor belt. The cylinder rod of the limiting cylinder is connected to the limiting block, and the limiting block cooperates with the other end of the tray carrier.

[0008] The pressure-holding device includes a base plate, a bottom fixing plate, a support plate, side plates, a pressure-holding cylinder, a horizontal plate, a slider fixing block, a pressure plate, an upper fixing plate, and a connecting plate. The base plate is mounted on the main fixing plate, and the side plates are mounted on the base plate via the bottom fixing plate. The support plate and the horizontal plate are respectively mounted between the middle and top sides of the side plates. The pressure-holding cylinder is mounted in the middle of the horizontal plate, and the cylinder rod of the pressure-holding cylinder is connected to the upper fixing plate. The lower sides of both ends of the upper fixing plate are connected to slider fixing blocks, and the sliders on the slider fixing blocks slide in engagement with the back of the connecting plate. The bottom of the connecting plate is fixed to the pressure plate, and the pressure plate engages with the insulating film on the tray carrier.

[0009] The beneficial effects of this utility model are: 1. The pressure holding mechanism uses a positioning and blocking device to accurately position and fix the lithium battery carrier with the insulating film attached. Then, the pressure holding device applies pressure to the insulating film and holds the pressure for a period of time, which can effectively eliminate these air bubbles and wrinkles, so that the insulating film can be completely bonded to the battery shell (aluminum-plastic film) or the tabs, thereby improving the appearance quality of the battery.

[0010] 2. Enhanced Adhesion Strength: Ensures a strong bond between the insulating film and the aluminum-plastic film or electrode tabs, reducing the risk of battery failure. A strong bond effectively isolates the electrodes from the conductive layer of the aluminum-plastic film, preventing internal short circuits and ensuring battery safety and reliability.

[0011] 3. Improve battery performance and long-term reliability: It avoids electrolyte leakage caused by poor adhesion, reduces the possibility of battery performance degradation, and helps to improve the long-term reliability and safety of soft-pack lithium batteries, meeting the stringent requirements of lithium battery performance in fields such as new energy vehicles, smart devices and energy storage technologies. Attached Figure Description

[0012] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments; Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of another orientation of the present invention. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0014] Reference Figure 1-2 The specific embodiment adopts the following technical solution: a lithium battery insulating film pressure holding mechanism, including a positioning blocking device and a pressure holding device set on a main fixing plate 1. The positioning blocking device is set on one side of the pressure holding device. The positioning blocking device includes a pad 2, a lifting fixing frame 3, a guide post 4, a guide sleeve 5, a blocking cylinder 6, a blocking block 7, a limiting cylinder 8, a limiting block 9, a conveyor belt 10, and a tray carrier 11. The blocking cylinder 6 and the limiting cylinder 8 are fixed on both sides of the lifting fixing frame 3 respectively. The cylinder rod of the blocking cylinder 6 is connected to the blocking block 7. The blocking block 7 is engaged with one end of the tray carrier 11 on the conveyor belt 10. The cylinder rod of the limiting cylinder 8 is connected to the limiting block 9. The limiting block 9 is engaged with the other end of the tray carrier 11.

[0015] It is worth noting that the pressure-holding device includes a base plate 12, a bottom fixing plate 13, a support plate 14, a side plate 15, a pressure-holding cylinder 16, a horizontal plate 17, a slider fixing block 18, a pressure plate 19, an upper fixing plate 20, and a connecting plate 21. The base plate 12 is mounted on the main fixing plate 1. The side plate 15 is mounted on the base plate 12 via the bottom fixing plate 13. The support plate 14 and the horizontal plate 17 are respectively mounted between the middle and top sides of the side plate 15. The pressure-holding cylinder 16 is mounted in the middle of the horizontal plate 17. The cylinder rod of the pressure-holding cylinder 16 is connected to the upper fixing plate 20. The lower sides of both ends of the upper fixing plate 20 are connected to the slider fixing block 18. The slider on the slider fixing block 18 slides in cooperation with the back of the connecting plate 21. The bottom of the connecting plate 21 is fixed on the pressure plate 19. The pressure plate 19 cooperates with the insulating film on the tray carrier 11.

[0016] The working principle of this specific embodiment: The positioning and blocking device works as follows: When the tray carrier carrying the lithium battery with the insulating film attached is transported to the pressure holding station by the conveyor belt, the blocking cylinders and limiting cylinders on both sides of the lifting and fixing frame begin to work. The cylinder rod of the blocking cylinder extends, pushing the blocking block to engage with one end of the tray carrier; the cylinder rod of the limiting cylinder extends, pushing the limiting block to engage with the other end of the tray carrier, thereby achieving blocking and positioning of the tray carrier and ensuring its accurate position during the pressure holding process. Components such as the pad, guide post, and guide sleeve play an auxiliary support and guiding role, ensuring the stability and accuracy of the entire positioning and blocking process.

[0017] Working principle of the pressure holding device: The base plate is set on the main fixed plate, providing stable support for the entire pressure holding device. The side plates are fixed to the base plate through the bottom fixed plate. The support plate and the cross plate are respectively set in the middle and top of the side plates, providing installation positions for components such as the pressure holding cylinder. The pressure holding cylinder in the middle of the cross plate is activated, and its cylinder rod extends downward, driving the upper fixed plate to move downward. The slider on the slider fixing block connected to the lower side of the upper fixed plate slides and engages with the back of the connecting plate, allowing the connecting plate to move smoothly downward, thereby driving the pressure plate to move downward. The pressure plate engages with the insulating film on the tray carrier, applying pressure to the insulating film and maintaining it for a period of time, so that the insulating film fully adheres to the battery, eliminating air bubbles and wrinkles generated during the adhesion process, and enhancing the adhesion strength.

[0018] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lithium battery insulation film pressure maintaining mechanism characterized by comprising: The system includes a positioning blocking device and a pressure holding device on a main fixing plate (1). The positioning blocking device is provided on one side of the pressure holding device. The positioning blocking device includes a pad (2), a lifting fixing frame (3), a guide post (4), a guide sleeve (5), a blocking cylinder (6), a blocking block (7), a limiting cylinder (8), a limiting block (9), a conveyor belt (10), and a pallet carrier (11). The lifting fixing frame (3) is fixed with a blocking cylinder (6) and a limiting cylinder (8) on both sides respectively. The cylinder rod of the blocking cylinder (6) is connected to the blocking block (7). The blocking block (7) is engaged with one end of the pallet carrier (11) on the conveyor belt (10). The cylinder rod of the limiting cylinder (8) is connected to the limiting block (9). The limiting block (9) is engaged with the other end of the pallet carrier (11).

2. The pressure maintaining mechanism for a lithium battery insulation film according to claim 1, characterized by, The pressure-holding device includes a base plate (12), a bottom fixing plate (13), a support plate (14), a side plate (15), a pressure-holding cylinder (16), a horizontal plate (17), a slider fixing block (18), a pressure plate (19), an upper fixing plate (20), and a connecting plate (21). The base plate (12) is mounted on the main fixing plate (1), and the side plate (15) is mounted on the base plate (12) via the bottom fixing plate (13). The side plates (15) are respectively positioned between the middle and one top side. The support plate (14) and the horizontal plate (17) are provided. A pressure-holding cylinder (16) is provided in the middle of the horizontal plate (17). The cylinder rod of the pressure-holding cylinder (16) is connected to the upper fixed plate (20). The lower sides of both ends of the upper fixed plate (20) are connected to slider fixing blocks (18). The slider on the slider fixing block (18) slides and engages with the back of the connecting plate (21). The bottom of the connecting plate (21) is fixed on the pressure plate (19). The pressure plate (19) engages with the insulating film on the tray carrier (11).

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