Lithium battery cell hot pressing device

Abstract

The utility model discloses a lithium battery cell hot-pressing device, and relates to the technical field of lithium battery cell hot-pressing equipment. The lower hot pressing plate is used for supporting a battery cell; the upper hot-pressing plate is arranged opposite to the lower hot-pressing plate and can be close to or far away from the lower hot-pressing plate so as to extrude the battery cell placed on the lower hot-pressing plate; and the anti-sticking assembly is arranged between the lower hot plate and the battery cell and is used for limiting the extruded battery cell to be stuck on the lower hot pressing plate. The battery cell hot-pressing device aims to prevent a battery cell from being adhered to the battery cell hot-pressing device after hot-pressing is completed.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery cell hot pressing equipment, and in particular to a lithium battery cell hot pressing device. Background Technology

[0002] With the rapid development of electric vehicles, energy storage devices, and consumer electronics, power lithium batteries have been widely used as core energy devices. Due to their high energy density, long cycle life, and environmentally friendly characteristics, power lithium batteries have become an important research direction in the modern energy field. In the production process of power lithium batteries, the battery cell, as its core component, has its manufacturing process directly affecting the battery's performance, reliability, and safety.

[0003] In the production of power lithium batteries, the formation of cells generally involves either winding or stacking processes. Regardless of the process used, the internal structure of a cell consists of a positive electrode, a negative electrode, and a separator sandwiched in between. Due to the characteristics of the winding or stacking process, the electrodes and separator of the cell are relatively loose after initial forming, and there will be certain gaps between the internal layers. This loose structure not only leads to uneven cell thickness but may also cause uneven distribution of electrochemical reactions, thereby affecting the performance and lifespan of the power lithium battery.

[0004] To address the aforementioned issues, existing manufacturing processes typically involve hot-pressing the battery cells. By applying pressure and temperature to the cells, voids within the cells can be effectively eliminated, allowing the electrodes and separators to bond tightly together. This improves the structural stability and thickness uniformity of the cells, thereby enhancing the battery's cycle performance and safety.

[0005] Currently, battery cells tend to adhere to the pressing plate during the lamination process, especially under high-temperature hot pressing conditions, where the electrode and separator materials of the cell adhere to the surface of the hot pressing plate to a certain extent. Cells adhering to the hot pressing plate are easily damaged during the peeling process using a robotic arm, particularly the active material on the electrode surface, which may be torn or detached. This not only reduces the yield rate of the battery cells but also increases material waste and production costs.

[0006] Therefore, how to prevent the battery cells from sticking to the battery cell hot pressing device after hot pressing has become an urgent technical problem to be solved. Utility Model Content

[0007] The main purpose of this utility model is to provide a lithium battery cell hot pressing device, which aims to prevent the battery cells from sticking to the hot pressing device after hot pressing.

[0008] To achieve the above objectives, this utility model proposes a lithium battery cell hot pressing device, comprising:

[0009] The lower hot plate is used to support the battery cells;

[0010] An upper hot press plate, disposed opposite to the lower hot press plate, can be positioned close to or away from the lower hot press plate to compress the battery cells placed on the lower hot press plate; and

[0011] An anti-stick component is disposed between the lower hot platen and the battery cell to prevent the battery cell, after extrusion, from sticking to the lower hot platen.

[0012] This lithium battery cell hot-pressing device effectively prevents the cells from sticking to the lower hot-pressing plate during the hot-pressing process by using an anti-sticking component placed between the lower hot-pressing plate and the cells. This improves hot-pressing efficiency and ensures the flatness of the cell surface. The Mylar film in the anti-sticking component provides isolation during the hot-pressing process and also has good heat resistance and strength, avoiding secondary contamination of the hot-pressing device.

[0013] In one embodiment of this application, the anti-stick component includes:

[0014] Anti-stick component, covering the lower heat press plate; and

[0015] A tightening member tightens the anti-stick member when the battery cell is placed on the anti-stick member, so that the anti-stick member located above the lower hot plate remains flat.

[0016] By covering the lower hot press plate with an anti-sticking component and combining it with the dynamic adjustment function of the tightening component, the battery cells can be effectively prevented from sticking to the lower hot press plate during the hot pressing process. The anti-sticking component ensures that the contact surface between the battery cell and the lower hot press plate is evenly stressed, ensuring the flatness of the battery cell surface after hot pressing. The tension control and automatic reset design of the tightening component maintains good isolation effect of the anti-sticking component, while reducing maintenance frequency and significantly improving the efficiency and stability of the hot pressing device.

[0017] In one embodiment of this application, the anti-stick component further includes:

[0018] At least two sets of clamping rollers are provided. When there are two sets of clamping rollers, the two sets of clamping rollers are a first clamping roller set and a second clamping roller set. The first clamping roller set is located on one side of the lower hot press plate and is used to clamp the anti-sticking part. The second clamping roller set is located on the other side of the lower hot press plate and is arranged opposite to the first clamping roller set.

[0019] With the first and second clamping roller groups respectively positioned on both sides of the lower hot press plate, and in conjunction with the dynamic adjustment functions of the tightening and anti-sticking components, the flatness and durability of the anti-sticking components are effectively ensured. During the hot pressing process, the anti-sticking components reliably isolate the battery cell from the lower hot press plate, preventing adhesion problems.

[0020] In one embodiment of this application, the anti-stick component further includes:

[0021] The driving component is connected to each clamping roller group. After the battery cell is pressed, it drives each clamping roller group to move closer to each other above the lower hot platen to form a clearance space, which facilitates the unloading of the battery cell.

[0022] Through the cooperation of the drive unit and the clamping roller assembly, the anti-sticking component can not only provide isolation during the hot pressing process, but also form a clearance space in time after the battery cell is pressed, ensuring the smooth feeding of the battery cell.

[0023] In one embodiment of this application, the clamping roller group includes:

[0024] The first clamping rod is disposed below the anti-sticking component; and

[0025] The second clamping rod is disposed above the anti-sticking component. The first clamping rod and the second clamping rod are arranged opposite to each other to form a clamping space to complete the clamping of the anti-sticking component.

[0026] The first and second clamping rollers in the clamping roller group form a clamping space by being arranged relative to each other. This not only firmly fixes the anti-sticking parts and ensures their flatness and stability during hot pressing and feeding, but also enables dynamic adjustment through the driving component, providing sufficient clearance for the feeding of battery cells.

[0027] In one embodiment of this application, the upper hot press plate is formed with a ceramic coating.

[0028] The ceramic coating has the characteristics of low surface energy and smoothness, which can significantly reduce the adhesion between the battery cell material and the upper hot plate, prevent the battery cell from sticking to the upper hot plate during the hot pressing process, reduce manual intervention, and improve production efficiency.

[0029] In one embodiment of this application, at least one through hole is formed on the upper hot plate for outputting positive pressure airflow to the battery cell.

[0030] Positive pressure airflow is output to the surface of the battery cell through the through hole, forming an air cushion effect, which can generate a separation force between the hot press plate and the battery cell, effectively preventing the battery cell from sticking to the upper hot press plate after hot pressing.

[0031] In one embodiment of this application, the anti-sticking element is a Mylar film.

[0032] The Mylar membrane has a smooth surface and low adhesion, which can effectively prevent the battery cell from sticking to the lower hot plate during the hot pressing process, ensuring that the battery cell can be smoothly removed after hot pressing.

[0033] In one embodiment of this application, a lifting member is also included, connected to the upper hot platen, for driving the upper hot platen closer to or further away from the lower hot platen.

[0034] By precisely controlling the displacement of the upper hot press plate, the lifting component can achieve stable and uniform pressure output during the hot pressing process, ensuring consistent pressure distribution of the battery cells during the hot pressing operation, and improving the thickness uniformity of the battery cells and product quality.

[0035] By employing the above technical solution, this lithium battery cell hot pressing device effectively prevents the battery cell from sticking to the lower hot pressing plate during the hot pressing process through an anti-stick component disposed between the lower hot pressing plate and the battery cell, thereby improving hot pressing efficiency and ensuring the flatness of the battery cell surface. The Mylar film in the anti-stick component provides isolation during the hot pressing process, while also possessing good heat resistance and strength, thus avoiding secondary contamination of the hot pressing device. Attached Figure Description

[0036] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings, wherein:

[0037] Figure 1 This is a schematic diagram of the structure in the initial state of the first embodiment of this utility model;

[0038] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0039] Figure 3 This is a schematic diagram of the completed state of the first embodiment of the present invention;

[0040] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0041] 10. Lower hot press plate; 20. Upper hot press plate; 30. Lifting component; 41. First clamping roller; 42. Second clamping roller; 50. Tightening component; 60. Battery cell. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain this utility model and do not constitute a limitation on this utility model.

[0043] like Figures 1 to 4 As shown, in order to achieve the above objectives, this utility model proposes a hot-pressing device for a lithium battery cell 60, comprising:

[0044] The lower hot plate 10 is used to support the battery cell 60;

[0045] The upper hot press plate 20 is disposed opposite to the lower hot press plate 10 and can move closer to or further away from the lower hot press plate 10 to compress the battery cell 60 placed on the lower hot press plate 10; and

[0046] An anti-stick component is disposed between the lower hot platen and the battery cell 60 to prevent the battery cell 60 from sticking to the lower hot platen 10 after extrusion.

[0047] Specifically, the lower hot press plate 10 supports the battery cell 60. The lower hot press plate 10 is made of a highly thermally conductive material, and its surface is smoothed to enhance its durability and heat transfer efficiency. The upper hot press plate 20 is positioned opposite the lower hot press plate 10. The upper hot press plate 20 can move closer to or further away from the lower hot press plate 10 via a driving mechanism to compress the battery cell 60 placed on the lower hot press plate 10 and complete the hot pressing process. The surface of the upper hot press plate 20 is treated with a high-temperature resistant ceramic coating, providing excellent anti-stick properties and preventing the battery cell 60 from adhering to the upper hot press plate 20 during the hot pressing process.

[0048] An anti-sticking assembly is positioned between the lower hot press plate 10 and the battery cell 60. This assembly includes a layer of Mylar film made of high-strength, high-temperature-resistant polyester film, offering excellent heat insulation and durability. The two ends of the Mylar film are fixed and tightened by upper and lower guide rollers and a tensioning member 50. The guide roller assembly is driven by cylinders mounted on both sides of the lower hot press plate 10. During hot pressing, the Mylar film covers the space between the battery cell 60 and the lower hot press plate 10, forming an effective anti-sticking barrier. The Mylar film can be moved as needed to accommodate battery cells 60 of different sizes by the movement of the driving cylinders. After hot pressing, the cylinders drive the guide rollers upwards, and the guide roller system re-tensions the Mylar film, preparing it for the next hot pressing cycle.

[0049] By adopting the above technical solution, the lithium battery cell 60 hot pressing device, through the anti-sticking component disposed between the lower hot pressing plate 10 and the cell 60, can effectively prevent the cell 60 from sticking to the lower hot pressing plate 10 during the hot pressing process, thereby improving the hot pressing efficiency and ensuring the surface flatness of the cell 60. The Mylar film in the anti-sticking component can provide isolation during the hot pressing process, while also having good heat resistance and strength, avoiding secondary contamination of the hot pressing device.

[0050] In one embodiment of this application, the anti-stick component includes:

[0051] Anti-stick component, covering the lower hot press plate 10; and

[0052] When the battery cell 60 is placed on the anti-sticking member, the tightening member 50 tightens the anti-sticking member so that the anti-sticking member located above the lower hot plate remains flat.

[0053] Specifically, the anti-stick assembly includes an anti-stick component and a tightening component 50. The anti-stick component is made of high-temperature resistant and wear-resistant polyester material and covers the surface of the lower hot press plate 10. The size of the anti-stick component is slightly larger than the hot pressing area of ​​the lower hot press plate 10 to ensure that the battery cell 60 completely covers the surface of the anti-stick component when placed. The anti-stick component is fixedly connected to the tightening component 50 at both ends to form a tightly fitting isolation layer against the lower hot press plate 10.

[0054] When the battery cell 60 is placed on the anti-sticking component, the tightening component 50 activates its tightening function to pull the anti-sticking component taut, keeping it flat under the heat-pressing plate 10 and preventing wrinkles from forming during the heat-pressing process. The tension of the anti-sticking component is monitored in real time by a tension sensor, and the tension of the tightening component 50 is adjusted through a feedback control system to ensure that the anti-sticking component is always in an optimal flat state.

[0055] During the hot pressing process, the anti-sticking component acts as an isolation layer to prevent direct contact between the battery cell 60 and the lower hot pressing plate 10, effectively preventing the battery cell 60 from sticking together due to high temperature or pressure. After the hot pressing is completed, the tightening component 50 releases the anti-sticking component through the reverse movement of the guide roller, and at the same time completes the automatic reset of the anti-sticking component for the next hot pressing operation.

[0056] By employing the above technical solution, the anti-sticking component covers the lower hot press plate 10, and combined with the dynamic adjustment function of the tightening component 50, the battery cell 60 can be effectively prevented from sticking to the lower hot press plate 10 during the hot pressing process. The anti-sticking component ensures that the contact surface between the battery cell 60 and the lower hot press plate 10 is evenly stressed, guaranteeing the flatness of the battery cell 60 surface after hot pressing. The tension control and automatic reset design of the tightening component 50 maintains a good isolation effect of the anti-sticking component, while reducing the maintenance frequency and significantly improving the efficiency and stability of the hot pressing device.

[0057] In one embodiment of this application, the anti-stick component further includes:

[0058] At least two sets of clamping rollers are provided. When there are two sets of clamping rollers, the two sets of clamping rollers are a first clamping roller set and a second clamping roller set. The first clamping roller set is located on one side of the lower hot press plate 10 and is used to clamp the anti-sticking part. The second clamping roller set is located on the other side of the lower hot press plate 10 and is arranged opposite to the first clamping roller set.

[0059] Specifically, at least two sets of clamping rollers are provided. When there are two sets of clamping rollers, they are designated as a first clamping roller set and a second clamping roller set. The first clamping roller set is located on one side of the lower hot press plate 10 and is used to clamp and fix the anti-stick component. The second clamping roller set is located on the other side of the lower hot press plate 10 and is positioned opposite to the first clamping roller set, and is used to clamp the anti-stick component.

[0060] The tightening component 50 in the anti-stick assembly works in conjunction with the clamping roller group to pull the two ends of the anti-stick component in opposite directions, ensuring that the area covered by the anti-stick component on the hot press plate 10 remains flat. During the hot pressing process, the clamping roller group adjusts the tension in real time, and feedback is obtained through a tension sensor to ensure that the anti-stick component is in the optimal tension state.

[0061] By adopting the above technical solution, the first clamping roller group and the second clamping roller group are respectively set on both sides of the lower hot press plate 10, and with the dynamic adjustment function of the tightening component 50 and the anti-stick component, the flatness and durability of the anti-stick component are effectively guaranteed. During the hot pressing process, the anti-stick component can reliably isolate the battery cell 60 from the lower hot press plate 10, avoiding adhesion problems.

[0062] In one embodiment of this application, the anti-stick component further includes:

[0063] The driving component is connected to each clamping roller group. After the battery cell 60 is pressed, it drives each clamping roller group to move closer to each other above the lower hot press plate 10 to form a clearance space, which facilitates the unloading of the battery cell 60.

[0064] Specifically, the drive unit is connected to the first and second clamping roller groups and is used to drive each clamping roller group to adjust its position during specific operation stages. After the battery cell 60 is pressed, the drive unit is activated, raising the first and second clamping roller groups from their working state to a position above the lower hot press plate 10. Subsequently, the drive unit controls the first and second clamping roller groups to move closer to each other, forming a clearance space to provide sufficient space for the battery cell 60 to be unloaded, thereby preventing the battery cell 60 from being scratched or deformed due to limited space during the unloading process.

[0065] After the battery cell 60 is unloaded, the drive unit actuates again, moving the first and second clamping roller groups to their initial working positions. The tightening component 50 then pulls the anti-stick component tight, ensuring it covers the lower hot press plate 10, preparing it for the next hot pressing operation. The entire process is automated by the system controller, which, in conjunction with a tension sensor, monitors the tension of the anti-stick component in real time, ensuring it remains flat throughout the hot pressing and unloading process.

[0066] By adopting the above technical solution, through the cooperation of the driving component and the clamping roller group, the anti-sticking component can not only provide isolation during the hot pressing process, but also form a clearance space in time after the battery cell 60 is pressed, ensuring the smooth feeding of the battery cell 60.

[0067] In one embodiment of this application, the clamping roller group includes:

[0068] The first clamping rod 41 is disposed below the anti-sticking component; and

[0069] The second clamping rod 42 is disposed above the anti-sticking component. The first clamping rod 41 and the second clamping rod 42 are arranged opposite to each other to form a clamping space to complete the clamping of the anti-sticking component.

[0070] Specifically, the clamping roller assembly includes a first clamping roller 41 and a second clamping roller 42. The first clamping roller 41 is positioned below the anti-sticking component and parallel to the lower hot press plate 10, primarily serving to support the bottom of the anti-sticking component. The second clamping roller 42 is positioned above the anti-sticking component and is arranged opposite to the first clamping roller 41, forming a clamping space between them. The length and width of the first clamping roller 41 and the second clamping roller 42 are designed to match the dimensions of the anti-sticking component to ensure clamping stability. Through a driving mechanism, the first clamping roller 41 and the second clamping roller 42 can generate relative movement, clamping the anti-sticking component within the clamping space, thereby achieving stable fixation of the anti-sticking component.

[0071] During the hot pressing process, the clamping roller assembly uses a tension control system to ensure the anti-sticking component remains flat and prevents a reduction in anti-sticking effect due to slack or displacement. After the battery cell 60 is hot-pressed, the drive unit is activated, controlling the first clamping roller 41 and the second clamping roller 42 of the clamping roller assembly to rise above the lower hot press plate 10. Subsequently, the first and second clamping roller assemblies are driven to move closer to each other, creating clearance space to facilitate the unloading of the battery cell 60. After unloading, the clamping roller assembly returns to its initial position, and the tightening component 50 re-tightens the anti-sticking component, preparing for the next hot pressing operation.

[0072] Using the above technical solution, the first clamping roller 41 and the second clamping roller 42 in the clamping roller group form a clamping space by being arranged relative to each other. This not only firmly fixes the anti-sticking parts and ensures their flatness and stability during hot pressing and feeding, but also enables dynamic adjustment through the driving parts, providing sufficient clearance space for feeding the battery cell 60.

[0073] In one embodiment of this application, a ceramic coating is formed on the upper hot press plate 20.

[0074] By adopting the above technical solution, the ceramic coating has the characteristics of low surface energy and smoothness, which can significantly reduce the adhesion between the battery cell 60 material and the upper hot press plate 20, prevent the battery cell 60 from sticking to the upper hot press plate 20 during the hot pressing process, reduce manual intervention, and improve production efficiency.

[0075] In one embodiment of this application, at least one through hole is formed on the upper hot plate 20, which can output positive pressure airflow to the battery cell 60.

[0076] Using the above technical solution, positive pressure airflow is output to the surface of the battery cell 60 through the through hole, forming an air cushion effect, which can generate a separation force between the hot press plate and the battery cell 60, effectively preventing the battery cell 60 from adhering to the upper hot press plate 20 after hot pressing.

[0077] In one embodiment of this application, the anti-sticking element is a Mylar film.

[0078] Using the above technical solution, the Mylar film has a smooth surface and low adhesion, which can effectively prevent the battery cell 60 from sticking to the lower hot press plate 10 during the hot pressing process, ensuring that the battery cell 60 can be smoothly removed after hot pressing.

[0079] In one embodiment of this application, a lifting member 30 is also included, connected to the upper hot press plate 20, for driving the upper hot press plate 20 to move closer to or away from the lower hot press plate 10.

[0080] By adopting the above technical solution, the lifting component 30 can achieve stable and uniform pressure output during the hot pressing process by precisely controlling the displacement of the upper hot pressing plate 20, ensuring that the pressure distribution of the battery cell 60 is consistent during the hot pressing operation, and improving the thickness uniformity and product quality of the battery cell 60.

[0081] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A lithium battery cell hot pressing device, characterized in that, include: The lower hot plate is used to support the battery cells; The upper hot plate is arranged opposite to the lower hot plate and can be close to or away from the lower hot plate to squeeze the battery cell placed on the lower hot plate. as well as An anti-stick component is disposed between the lower hot platen and the battery cell to prevent the battery cell, after extrusion, from sticking to the lower hot platen.

2. The lithium battery cell hot pressing device as described in claim 1, characterized in that, The anti-stick component includes: Anti-stick component, covering the lower heat press plate; and A tightening member tightens the anti-stick member when the battery cell is placed on the anti-stick member, so that the anti-stick member located above the lower hot plate remains flat.

3. The lithium battery cell hot pressing device as described in claim 2, characterized in that, The anti-stick component also includes: At least two sets of clamping rollers are provided. When there are two sets of clamping rollers, the two sets of clamping rollers are a first clamping roller set and a second clamping roller set. The first clamping roller set is located on one side of the lower hot press plate and is used to clamp the anti-sticking part. The second clamping roller set is located on the other side of the lower hot press plate and is arranged opposite to the first clamping roller set.

4. The lithium battery cell hot pressing device as described in claim 3, characterized in that, The anti-stick component also includes: The driving component is connected to each clamping roller group. After the battery cell is pressed, it drives each clamping roller group to move closer to each other above the lower hot platen to form a clearance space, which facilitates the unloading of the battery cell.

5. The lithium battery cell hot pressing device as described in claim 3, characterized in that, The clamping roller assembly includes: The first clamping rod is disposed below the anti-sticking component; and The second clamping rod is disposed above the anti-sticking component. The first clamping rod and the second clamping rod are arranged opposite to each other to form a clamping space to complete the clamping of the anti-sticking component.

6. The lithium battery cell hot pressing device according to any one of claims 1 to 5, characterized in that, A ceramic coating is formed on the upper hot press plate.

7. The lithium battery cell hot pressing device as described in claim 6, characterized in that, At least one through hole is formed on the upper hot plate that can output positive pressure airflow to the battery cell.

8. The lithium battery cell hot pressing device as described in claim 2, characterized in that, The anti-sticking component is a Mylar film.

9. The lithium battery cell hot pressing device as described in claim 1, characterized in that, It also includes a lifting component connected to the upper hot platen, used to drive the upper hot platen closer to or away from the lower hot platen.

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