A rolling device for producing battery electrode sheets

Abstract

This disclosure relates to the field of battery electrode processing equipment. One embodiment provides a rolling device for battery electrode production, used for rolling electrode material coated on metal foil. The device includes a first pressure roller rotatably mounted on a frame; two sets of circumferentially arranged end pressure rollers are rotatably mounted at both ends of the first pressure roller, with the end pressure rollers and the first pressure roller used to roll the edge of the metal foil. Each of the two sets of end pressure rollers has an arc-shaped side baffle at one end close to the other, forming an arc-shaped gap with the first pressure roller for the metal foil to pass through; a second pressure roller is rotatably mounted on the frame and extends between the two arc-shaped side baffles, with the second pressure roller and the first pressure roller used to roll the electrode material coated on the metal foil. This technical solution solves the technical problem in the prior art where the compaction density and thickness consistency of the rolled battery electrode produced during battery electrode production need to be improved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of battery electrode processing equipment technology, and more specifically, to a rolling device for battery electrode production. Background Technology

[0002] In the production of new energy batteries such as lithium-ion and sodium-ion batteries, electrode preparation is a core step that determines battery performance, and the rolling process directly affects the compaction density and thickness consistency of the electrode, which is crucial to the battery's energy density and cycle life. Currently, the mainstream dual-roller rolling device first coats the positive and negative electrode active materials onto the surfaces of aluminum foil and copper foil respectively to form wet electrode sheets. After drying, upper and lower rollers apply pressure to compact the active material layer to the target thickness, while simultaneously enhancing the material bonding strength and foil adhesion.

[0003] As the requirements for battery performance in the new energy vehicle and energy storage sectors increase, the tolerance standards for electrode thickness are becoming increasingly stringent, requiring a single-sheet deviation of ≤±2μm and an overall roll fluctuation of ≤5μm. However, when processing wide (over 1.2m) and high-capacity electrodes, existing equipment often exhibits uneven thickness, manifesting as differences in thickness between the center and edges, periodic fluctuations along the rolling direction, and even localized "bulges" and "dents." This not only leads to misalignment in subsequent cell winding / stacking but also causes uneven current distribution within the battery, resulting in localized overheating, accelerated capacity decay, and severely reduced yield and reliability. Summary of the Invention

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a rolling device for battery electrode production, which solves the technical problem that the compaction density and thickness consistency of the battery electrode produced by rolling during battery electrode production need to be improved in the prior art.

[0005] According to one aspect, at least one embodiment of this disclosure provides a rolling apparatus for producing battery electrode sheets, used for rolling electrode materials coated on metal foil, comprising:

[0006] Frame;

[0007] The first pressure roller is rotatably mounted on the frame.

[0008] An end pressure roller is provided at each end of the first pressure roller. Each set of end pressure rollers is arranged circumferentially along the first pressure roller. The end pressure rollers are rotatably mounted on the frame and are used to roll the edge of the metal foil between themselves and the first pressure roller.

[0009] Arc-shaped side baffles are provided at the ends of the two sets of end pressure rollers that are close to each other. An arc-shaped gap is formed between the arc-shaped side baffles and the first pressure roller. The arc-shaped gap is used for the metal foil to pass through.

[0010] The second pressure roller is rotatably mounted on the frame and extends between the two arc-shaped side baffles. The second pressure roller and the first pressure roller are used to roll the electrode material coated on the metal foil. A retaining space for accommodating the coating material is formed between the first pressure roller, the second pressure roller and the two arc-shaped side baffles. The coating material contained in the retaining space can be coated on the metal foil and rolled by the first pressure roller and the second pressure roller.

[0011] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, which further includes a discharge assembly for discharging the electrode material to be coated, and is disposed above the material blocking space, including:

[0012] A container having a material cavity, the bottom of which has a strip-shaped discharge port located above the material blocking space;

[0013] A pump feed gear is disposed within the feed chamber and located above the discharge port.

[0014] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, wherein the discharge assembly further includes:

[0015] A flow-retarding frame is disposed between the pump material gear and the discharge port, with its two ends respectively disposed on two opposite cavity walls of the material chamber. The flow-retarding frame is a long frame type.

[0016] Slow-flow fiber bundles, which are disposed within the slow-flow frame for slowing the flow of electrode materials.

[0017] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, wherein the slow-flow fiber bundle includes a transverse fiber bundle and a vertical fiber bundle. The transverse fiber bundle is transverse and disposed on the upper part of the slow-flow frame, and the vertical fiber bundle is vertical and disposed on the lower part of the slow-flow frame. The upper end of the vertical fiber bundle is disposed on the transverse fiber bundle.

[0018] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, wherein the discharge assembly further includes:

[0019] The first rubber discharge baffle has two sections, which are obliquely arranged and the distance between them gradually decreases from top to bottom until they abut at their lowest points. The two first rubber discharge baffles are located on both sides outside the discharge port and have a blocked state and an open state. When not subjected to external force, the lower ends abut at each other to block the discharge port. When subjected to the action of the pumping gear to pump material, the lower ends separate to open the discharge port.

[0020] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, wherein the discharge assembly further includes:

[0021] The second rubber discharge baffle is provided on the inner wall of both first rubber discharge baffles. The distance between the two second rubber discharge baffles gradually decreases from bottom to top until the distance at the top end is the smallest, forming a material passage gap. The material passage gap is located below the slow-flowing fiber bundle. A material storage space is formed between the second rubber discharge baffle and the first rubber discharge baffle. When the material is applied to the storage space, it can push the upper ends of the two second rubber discharge baffles closer to each other, thereby reducing the material passage gap.

[0022] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, wherein the discharge assembly further includes:

[0023] An elastic element is located at the material passage gap, with its two ends acting on two second rubber discharge baffles to provide a force that keeps the material passage gap open.

[0024] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, wherein the position of the first rubber discharge baffle is adjustable. After the position is adjusted, it is used to change the contact force at the lower ends of the two first rubber discharge baffles, thereby changing the material pumping amount required for the first rubber discharge baffle to change from the blocked state to the open state.

[0025] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrodes, wherein each of the two first rubber discharge baffles has a guide groove on one side that is close to each other, and there are several guide grooves arranged sequentially along the length direction of the first rubber discharge baffles.

[0026] For example, at least one embodiment of this disclosure provides a rolling device for producing battery electrode sheets, wherein the guide grooves of the two first rubber discharge baffles are staggered.

[0027] The beneficial effects of the embodiments disclosed herein are as follows:

[0028] In this disclosure, the edge neatness of the coating material is ensured by the material blocking of the arc-shaped side baffle, so that the coating material can maintain good uniformity after coating, which can initially solve the problem of uneven electrode thickness, improve the quality and consistency of the electrode, and thus improve the yield and performance stability of the battery. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the roller pressing device in one embodiment of the present disclosure;

[0031] Figure 2 for Figure 1 A top view of the roller pressing device in the embodiment;

[0032] Figure 3 for Figure 2 Schematic diagram of the AA section structure;

[0033] Figure 4 for Figure 3 A magnified schematic diagram of part of the B section;

[0034] Figure 5 for Figure 1 A schematic diagram of the discharge component in the embodiment;

[0035] Figure 6 for Figure 1 A schematic diagram of the internal structure of the discharge component in the embodiment;

[0036] Figure 7 for Figure 6 A magnified schematic diagram of the C-shaped structure.

[0037] In the figure: frame 100, first pressure roller 200, end pressure roller 300, arc-shaped side baffle 400, second pressure roller 500, material blocking space 600, discharge assembly 700, container 710, material cavity 711, discharge port 712, pump material pair gear 720, slow flow frame 730, slow flow fiber bundle 740, transverse fiber bundle 741, vertical fiber bundle 742, first rubber discharge baffle 750, guide groove 751, second rubber discharge baffle 760, material passage gap 761, material storage space 762, elastic element 770. Detailed Implementation

[0038] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0039] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0040] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0041] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0043] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] like Figures 1-4The diagram illustrates a rolling device for producing battery electrode sheets according to an embodiment of this disclosure. It is used to roll electrode materials coated on metal foil. The device includes a frame 100, a first pressure roller 200, end pressure rollers 300, an arc-shaped side baffle 400, and a second pressure roller 500. The first pressure roller 200 is rotatably mounted on the frame 100. Each end of the first pressure roller 200 has a set of end pressure rollers 300 arranged circumferentially around the first pressure roller 200. The end pressure rollers 300 are rotatably mounted on the frame 100, and are positioned between the end pressure rollers and the first pressure roller 200 to roll the edges of the metal foil. The ends of the two sets of end pressure rollers 300 are close to each other. Each roller is equipped with an arc-shaped side baffle 400, forming an arc-shaped gap between itself and the first pressure roller 200. The arc-shaped gap allows the metal foil to pass through. The second pressure roller 500 is rotatably mounted on the frame 100 and extends between the two arc-shaped side baffles 400. The space between the second pressure roller 500 and the first pressure roller 200 is used to roll the electrode material coated on the metal foil. A retaining space 600 for accommodating the coating material is formed between the first pressure roller 200, the second pressure roller 500, and the two arc-shaped side baffles 400. The coating material contained in the retaining space 600 can be coated on the metal foil and rolled by the first pressure roller 200 and the second pressure roller 500.

[0045] For example, the frame 100, serving as the supporting structure for the entire device, adopts a frame design, possessing sufficient strength and stability to withstand the pressure and vibration generated by each component during operation. The frame has multiple mounting positions for installing the first pressure roller 200, the end pressure roller 300, the arc-shaped side baffle 400, and the second pressure roller 500. Simultaneously, the frame provides pre-installed wiring and conduit channels, facilitating the arrangement of various lines and pipes, ensuring a neat overall layout of the equipment, and simplifying maintenance and management.

[0046] The first pressure roller 200 is rotatably mounted on the frame 100 via bearings, ensuring smooth and high-precision rotation. The roller surface undergoes special treatment, exhibiting excellent wear resistance and smoothness to prevent damage during the rolling of metal foil and to facilitate uniform distribution of the coating material. Both ends of the first pressure roller 200 provide rotational support points for the end pressure roller 300, and it possesses its own independent drive system, allowing precise control of speed and direction of rotation to adapt to different rolling process requirements.

[0047] At each end of the first pressure roller 200, there is a set of end pressure rollers 300 arranged circumferentially. The number of end pressure rollers in each set is set according to actual needs. They are mounted on a specially designed bracket via small, high-precision bearings, which is securely connected to the frame 100. The end pressure rollers 300 are driven by a miniature drive motor, allowing for adjustable rotation speed. This design enables the end pressure rollers 300 to roll along the edges of the electrode sheet, ensuring stable delivery of the metal foil.

[0048] Both sets of end pressure rollers 300 have arc-shaped side baffles 400 installed at their closest ends. The shape of the arc-shaped side baffles 400 is designed to form a specific arc-shaped gap with the first pressure roller 200. This gap guides the metal foil through smoothly while restricting the flow range of the coating material. The arc-shaped side baffles 400 are connected to the brackets of the end pressure rollers 300 via an adjustable connecting mechanism. Their position can be flexibly adjusted according to different electrode width and thickness requirements to ensure that the size of the arc-shaped gap matches production needs.

[0049] The second pressure roller 500 is also rotatably mounted on the frame 100 via bearings, and its position extends between the two arc-shaped side baffles 400. The second pressure roller 500 cooperates with the first pressure roller 200 to roll the electrode material coated on the metal foil. The second pressure roller 500 has a similar drive and adjustment system to the first pressure roller 200, which can precisely control the rotational speed during the rolling process, and works in coordination with the first pressure roller 200 to ensure the compaction density and thickness consistency of the electrode sheet.

[0050] The first pressure roller 200, the second pressure roller 500, and the two arc-shaped side baffles 400 enclose a material-holding space 600. This space is used to hold the coating material. During the rolling process, the coating material is squeezed by the pressure rollers within the material-holding space 600 and uniformly coated onto the metal foil, and then rolled to the target thickness.

[0051] The metal foil is first steadily conveyed between the end pressure roller 300 and the first pressure roller 200. In the retaining space 600, the metal foil is coated with electrode material. The electrode-coated metal foil continues forward, entering between the first pressure roller 200 and the second pressure roller 500. At this point, the coating material is evenly coated onto the surface of the metal foil and compacted under the rotational pressure of the two rollers. The first pressure roller 200 and the second pressure roller 500 control their rotational speeds through their respective drive systems to ensure uniform distribution of the coating material on the metal foil, while achieving the required compaction density to meet the electrode thickness tolerance standards.

[0052] The arc-shaped side baffle 400 restricts the overflow of coating material during the rolling process, so that the coating material maintains a relatively stable distribution within the baffle space 600, which helps to improve the uniformity and consistency of electrode coating.

[0053] During equipment operation, ensure smooth passage through each rolling zone. Monitor key parameters such as electrode thickness and compaction density in real time, and adjust the speed and pressure of the first roller 200, end roller 300, and second roller 500 promptly based on actual measurement results using the control system. If uneven electrode thickness or misalignment is detected, immediately stop the machine for investigation and handling to ensure production continuity and product quality stability.

[0054] By using the curved side baffle 400 to block the material, the edge neatness of the coating material is ensured, so that the coating material can maintain good uniformity after coating. This initially solves the problem of uneven electrode thickness, improves the quality and consistency of the electrode, and thus improves the yield and performance stability of the battery.

[0055] In some examples, such as Figures 4-7 As shown, it also includes a discharge assembly 700, which is used to deliver the electrode material to be coated. It is disposed above the material blocking space 600 and includes a container 710 and a pump gear pair 720. The container 710 has a material cavity 711, and the bottom of the material cavity 711 has a strip-shaped discharge port 712. The discharge port 712 is located above the material blocking space 600. The pump gear pair 720 is disposed in the material cavity 711 and is located above the discharge port 712.

[0056] For example, the container 710 has a material cavity 711 inside for storing the electrode material to be coated. The strip-shaped outlet 712 at the bottom of the material cavity 711 is designed to be positioned above the material blocking space 600. The outlet 712 allows the electrode material to flow out evenly, covering a suitable area, laying the foundation for subsequent uniform coating on the metal foil. The container 710 is securely mounted on the frame 100, ensuring its position is fixed during operation.

[0057] The pump feed gear 720 is located within the feed chamber 711 and above the discharge port 712. It consists of two meshing gears, mounted on the wall of the feed chamber 711 via a shaft and bearings. A sealing device is provided at the shaft end to prevent material leakage. The pump feed gear 720 is driven by an independent drive mechanism, which can precisely control the rotational speed of the pump feed gear 720, thereby achieving precise control of the electrode material discharge speed.

[0058] After the device is started, the drive mechanism drives the pump-pair gear 720 to rotate. Under the meshing action of the pump-pair gear 720, the electrode material in the material chamber 711 is pushed towards the discharge port 712. Since the drive mechanism can precisely adjust the rotation speed of the pump-pair gear 720, the discharge amount of electrode material can be accurately controlled according to the electrode production speed and coating requirements.

[0059] The electrode material flowing out from the outlet 712 reaches the top of the retaining space 600 in a uniform flow. At this time, the metal foil passes through the retaining space 600 under the drive of the first pressure roller 200 and the second pressure roller 500. Under the pressure of the pressure rollers and its own gravity, the electrode material is uniformly coated on the surface of the metal foil, and then compacted by the pressure rollers, completing the coating and rolling process of the electrode sheet.

[0060] The discharge assembly 700, with the help of the pump-pair gear 720 and the adjustable drive mechanism, can precisely control the discharge speed of the electrode material, matching it with the electrode production speed, ensuring consistent electrode coating thickness, and improving the stability of electrode quality.

[0061] The strip-shaped outlet 712 of the container 710 allows the electrode material to flow out in a uniform flow, covering a suitable area above the baffle space 600, ensuring uniform coating of the metal foil and avoiding electrode quality problems caused by uneven coating.

[0062] The independent drive and adjustable features of the discharge assembly 700 enable the roller pressing device to better adapt to different types and viscosities of electrode materials and diverse electrode production process requirements, thereby improving the equipment's versatility and flexibility.

[0063] In some examples, the discharge assembly 700 also includes a flow buffer 730 and a flow buffer fiber bundle 740. The flow buffer 730 is disposed between the pump material gear 720 and the discharge port 712, and its two ends are respectively disposed on the two opposite cavity walls of the material cavity 711. The flow buffer 730 is a long frame type, and the flow buffer fiber bundle 740 is disposed in the flow buffer 730 for the flow buffer of the electrode material.

[0064] For example, the flow buffer 730 is a long, narrow frame that can be securely positioned between the pump feed gear 720 and the discharge port 712. The two ends of the flow buffer 730 are fixed to the two opposing cavity walls of the feed chamber 711, ensuring no displacement during operation. This frame structure provides reliable support for the flow-retarded fiber bundle 740 and also helps guide the flow direction of the electrode material.

[0065] The slow-flow fiber bundle 740 is housed inside the slow-flow frame 730. The slow-flow fiber bundle 740 is composed of multiple fibers with high flexibility and chemical corrosion resistance. These fibers, when in contact with the electrode material, neither affect the chemical properties of the electrode material nor disrupt the pulsation of the material flow. The slow-flow fiber bundle 740 is neatly packed within the slow-flow frame 730, forming a buffer layer with a certain porosity. As the electrode material passes through this buffer layer, the flow rate is adjusted, and the pulsation is buffered.

[0066] During the pumping process of the electrode material from the pump gear 720 to the outlet 712, pulsation is inevitable. When the pulsating electrode material flows to the flow buffer 730, the flow-slowing fiber bundle 740 plays a buffering role. The high flexibility and orderly arranged pore structure of the fiber bundle disperses and absorbs the energy of the pulsation as the electrode material passes through. The electrode material makes full contact with the surface of the fiber bundle, and the flow rate is adjusted. The originally uneven pulsating flow gradually transforms into a relatively stable and uniform flow, ensuring that the electrode material flowing out of the outlet 712 has a consistent velocity, thus guaranteeing uniform coating on the metal foil in the subsequent process.

[0067] The electrode material, after being buffered by the slow-flowing fiber bundle 740, flows out from the outlet 712 in a stable state, uniformly covering the material blocking space 600. The metal foil, driven by the first pressure roller 200 and the second pressure roller 500, passes through the material blocking space 600. Due to the stable discharge of the electrode material, it can be more evenly coated on the surface of the metal foil under the pressure of the pressure rollers and its own gravity. Subsequently, it is compacted by the pressure rollers, further improving the quality and consistency of the electrode coating.

[0068] The arrangement of the slow-flow rack 730 and the slow-flow fiber bundle 740 effectively buffers the pulsation during the pumping process of the pump material to the gear 720, so that the electrode material can flow out from the outlet 712 at a stable and consistent speed, avoiding the problem of uneven electrode coating thickness caused by unstable discharge, and further improving the quality stability of the electrode.

[0069] Stable material output ensures uniform coating of electrode materials on the metal foil, reducing defects caused by uneven coating, such as localized areas of excessive thickness or thinness, or uneven coating. This helps improve the overall quality of the electrode sheet, thereby enhancing battery performance and reliability.

[0070] The design of the slow-flow fiber bundle 740 can adapt to electrode materials with different viscosities and properties. By adjusting the arrangement and filling density of the fiber bundle, it can meet the buffering requirements of various electrode materials and enhance the adaptability of the equipment to different production processes.

[0071] In some examples, the flow-retarding fiber bundle 740 includes a transverse fiber bundle 741 and a vertical fiber bundle 742. The transverse fiber bundle 741 is transverse and disposed on the upper part of the flow-retarding frame 730, and the vertical fiber bundle 742 is vertical and disposed on the lower part of the flow-retarding frame 730. The upper end of the vertical fiber bundle 742 is disposed on the transverse fiber bundle 741.

[0072] For example, the transverse fiber bundle 741 is composed of multiple high-strength, flexible, and chemically resistant fibers arranged together. The transverse fiber bundle 741 is positioned along the transverse direction of the flow buffer 730 at its upper part, and its length is adapted to the transverse length of the flow buffer 730, covering the entire transverse area of ​​the upper part of the flow buffer 730. The transverse fiber bundle 741 ensures sufficient porosity for the electrode material to pass through, while also buffering the transverse pulsations generated during the flow of the electrode material.

[0073] The vertical fiber bundle 742 is also made of the same material as the horizontal fiber bundle 741. The vertical fiber bundle 742 is arranged along the vertical direction of the flow buffer 730 at the lower part of the buffer, and its height is determined according to the height of the flow buffer 730 and the actual buffering requirements. The upper ends of the vertical fiber bundle 742 are connected to both sides of the horizontal fiber bundle 741, forming a continuous buffer structure. The arrangement of the vertical fiber bundle 742, in conjunction with the horizontal fiber bundle 741, not only buffers the vertical pulsation of the electrode material but also further adjusts the flow rate of the electrode material, making it more uniform and stable.

[0074] When the pumping gear 720 pumps the electrode material, the pulsating electrode material first impacts the transverse fiber bundle 741. The transverse fiber bundle 741, with its transversely arranged structure and specific weaving density, effectively disperses and buffers the pulsating energy of the electrode material in the transverse direction, making the flow velocity of the electrode material more uniform in the transverse direction. Next, the transversely buffered electrode material flows downwards to the vertical fiber bundle 742. The vertical fiber bundle 742 further buffers and adjusts the pulsation of the electrode material in the vertical direction, making the flow velocity of the electrode material in the vertical direction also tend to stabilize. Through the synergistic effect of the transverse fiber bundle 741 and the vertical fiber bundle 742, the pulsation of the electrode material is significantly reduced, and it flows out of the discharge port 712 more stably and consistently, providing better conditions for uniform coating of the electrode sheet.

[0075] The electrode material, after being buffered by the transverse and vertical fiber bundles, flows out from the discharge port 712 in a stable state, uniformly covering the material blocking space 600. The metal foil, driven by the first pressure roller 200 and the second pressure roller 500, passes through the material blocking space 600. Due to the stable discharge of the electrode material, it can be more evenly coated on the surface of the metal foil under the pressure of the pressure rollers and its own gravity. Subsequently, it is compacted by the pressure rollers, greatly improving the quality and consistency of the electrode coating.

[0076] The combined design of transverse fiber bundle 741 and vertical fiber bundle 742 achieves multi-level buffering of electrode material in both transverse and vertical directions. Compared with a single-structure slow-flow fiber bundle, it can more effectively reduce the pulsation of the pump material during the pumping process of gear 720, and further improve the stability of the output.

[0077] More stable material output results in more uniform coating of electrode material on the metal foil, reducing coating defects caused by pulsation, such as uneven coating thickness and surface roughness. This helps improve the quality of the electrode sheets, thereby enhancing battery performance and reliability and reducing the defect rate.

[0078] The rational fiber bundle structure design enhances the adaptability of the slow-flow fiber bundle 740 to electrode materials with different flow rates and viscosities, enabling the equipment to maintain a stable output state when facing various production process requirements, improving the versatility and stability of the equipment, and reducing the risk of equipment adjustment and failure due to process changes.

[0079] In some examples, the discharge assembly 700 also includes two first rubber discharge baffles 750, which are obliquely arranged and the distance between them gradually decreases from top to bottom until they abut at their lowest points. They are located on both sides outside the discharge port 712. The two first rubber discharge baffles 750 have a blocked state and an open state. When the two first rubber discharge baffles 750 are not subjected to external force, their lower ends abut at each other to block the discharge port 712. When the material is pumped by the pumping gear 720, their lower ends separate to open the discharge port 712.

[0080] For example, the first rubber discharge baffle 750 is made of a highly elastic, wear-resistant, and chemically resistant rubber material. This rubber material can maintain good physical properties even under long-term contact with the electrode material, without aging, deformation, or chemical reaction with the electrode material. Each baffle is elongated and its length matches the length of the discharge port 712, ensuring complete coverage of both sides of the discharge port 712.

[0081] Two first rubber discharge baffles 750 are obliquely arranged on both sides of the discharge port 712. Viewed vertically, they form an inverted V-shape, with the distance between the two baffles gradually decreasing from top to bottom until their lower ends abut. This unique structural design ensures that under normal conditions, when the two first rubber discharge baffles 750 are not subjected to external force, their lower ends abut against each other, forming a barrier that effectively seals the discharge port 712, preventing leakage of electrode material if suitable pumping conditions are not met.

[0082] When the pump gear 720 starts pumping material, the pressure generated by the material acts on the two first rubber discharge baffles 750, overcoming the contact resistance between the baffles and causing their lower ends to separate, entering the open state. At this time, the electrode material can flow out smoothly from the discharge port 712.

[0083] During the initial startup of the device or before the pump gear 720 begins operation, the two first rubber discharge baffles 750 are in a blocked state, tightly sealing the discharge port 712 to prevent electrode material from flowing out due to gravity or other minor disturbances, ensuring precise control of the discharge. When the pump gear 720 begins pumping electrode material, as the material pressure gradually increases, the force acting on the first rubber discharge baffles 750 also gradually increases. When this force reaches a certain level, it is sufficient to overcome the rubber elasticity required for the lower ends of the two baffles to abut against each other, causing the lower ends of the baffles to separate, the discharge port 712 to open, and the electrode material flows out through the discharge port 712 under the push of the pump gear 720.

[0084] The opening process of the first rubber discharge baffle 750 is matched with the pumping rhythm of the pumping gear 720, ensuring that the electrode material can flow out of the discharge port 712 stably at the appropriate time. This helps maintain the stability of the discharge, thereby ensuring that the electrode material is evenly distributed above the baffle space 600, providing a guarantee for the uniform coating of the metal foil as it passes through driven by the first pressure roller 200 and the second pressure roller 500. After coating, the quality and consistency of the electrode sheet are effectively improved under the compaction action of the pressure rollers.

[0085] The design of the first rubber discharge baffle 750 enables automatic control of the discharge port 712, which can only be opened when the pump gear 720 is activated, thus avoiding accidental leakage of electrode material, improving the accuracy and stability of discharge, and helping to improve the quality consistency of electrode coating.

[0086] By effectively controlling the discharge, interference caused by abnormal discharge to electrode production is reduced, the risk of equipment failure is lowered, the reliability and stability of the entire rolling device are improved, the continuity of the production process is ensured, and the uniformity of product thickness is guaranteed.

[0087] Working in conjunction with the pump material pair gear 720, the discharge process is made more in line with the production process requirements, and can better adapt to the characteristics and production rhythm of different types of electrode materials. This provides strong support for optimizing the production process and helps to improve the production efficiency and quality of battery electrodes.

[0088] In some examples, the discharge assembly 700 also includes a second rubber discharge baffle 760. The inner walls of the two first rubber discharge baffles 750 are provided with the second rubber discharge baffle 760. The distance between the two second rubber discharge baffles 760 gradually decreases from bottom to top until the distance at the upper end is the smallest, forming a material passage gap 761. The material passage gap 761 is located below the slow-flowing fiber bundle 740. A material storage space 762 is formed between the second rubber discharge baffle 760 and the first rubber discharge baffle 750. When the material is applied to the material storage space 762, it can push the upper ends of the two second rubber discharge baffles 760 closer to each other, thereby reducing the material passage gap 761.

[0089] For example, the second rubber discharge baffle 760 is made of a rubber material that is similar to the first rubber discharge baffle 750 in that it is highly elastic, wear-resistant, and chemically resistant. Each second rubber discharge baffle 760 is also elongated, with a length that matches that of the first rubber discharge baffle 750, and is connected to the inner wall of the first rubber discharge baffle 750.

[0090] The distance between the two second rubber discharge baffles 760 gradually decreases from bottom to top until the distance at the top is the smallest, forming a material passage gap 761. The material passage gap 761 is located below the slow-flow fiber bundle 740. When the electrode material flows out from the slow-flow fiber bundle 740, it will pass through this material passage gap 761 and then flow out from the discharge port 712.

[0091] Furthermore, a storage space 762 is formed between the second rubber discharge baffle 760 and the first rubber discharge baffle 750. When the pumping gear 720 pumps electrode material, although the slow-flowing fiber bundle 740 has already buffered the pulsation to a certain extent, some residual pulsation may still exist. When electrode material with residual pulsation enters the storage space 762, the material pressure in the storage space 762 will change. Under the action of pulsating pressure, the material in the storage space 762 will push the upper ends of the two second rubber discharge baffles 760 closer to each other, thereby reducing the material passage gap 761. When the material passage gap 761 decreases, the flow rate of the electrode material passing through will decrease accordingly, further buffering the pulsation. When the pulsating pressure weakens, the second rubber discharge baffle 760 will recover a certain shape due to its own elasticity, the material passage gap 761 will increase, and the electrode material flow rate will return to normal. In this way, through the passive adjustment of the material passage gap 761, the impact of pumping pulsation on the uniformity of electrode thickness is effectively reduced.

[0092] The electrode material, after being subjected to double buffering pulsation by the slow-flowing fiber bundle 740 and the second rubber discharge baffle 760, flows out of the discharge port 712 more stably. Stable discharge ensures that the electrode material is evenly distributed above the baffle space 600. When the metal foil passes through the baffle space 600 driven by the first pressure roller 200 and the second pressure roller 500, the electrode material can be evenly coated on the surface of the metal foil. Subsequently, under the compaction action of the pressure rollers, the thickness uniformity of the electrode sheet is effectively guaranteed, thereby improving the quality of the battery electrode sheet.

[0093] The second rubber discharge baffle 760 adds a buffer against pulsations during the discharge process. By passively adjusting the material passage gap 761, the impact of pump material pulsations on the electrode thickness uniformity is further reduced. Compared to relying solely on the slow-flow fiber bundle 740, this method can more effectively reduce electrode quality problems caused by pulsations and improve the quality stability of the electrode.

[0094] More stable material output ensures a more uniform coating of electrode materials on the metal foil, significantly improving the thickness uniformity of the electrode sheets. This helps improve battery performance and reliability, reduces battery defect rates due to electrode quality issues, and enhances product competitiveness.

[0095] The second rubber discharge baffle 760 works in conjunction with other components to optimize the performance of the entire discharge assembly 700. This design enhances the equipment's adaptability to pump material pulsation, enabling stable operation under different production conditions and improving equipment reliability and production efficiency.

[0096] In some examples, the discharge assembly 700 also includes an elastic element 770 located at the material passage gap 761, with its two ends acting on two second rubber discharge baffles 760 respectively to provide a force that keeps the material passage gap 761 open.

[0097] For example, the elastic element 770 can be a spring made of stainless steel to ensure that it will not rust or corrode during long-term contact with the electrode material, thus affecting its performance. The length of the spring is precisely designed according to the size of the material passage gap 761 and the required elastic force, and both ends are tightly connected to the two second rubber discharge baffles 760 respectively. During installation, one end of the spring is fixed to the inner wall of one of the second rubber discharge baffles 760 near the material passage gap 761, and the other end is fixed to the corresponding position of the other second rubber discharge baffle 760, so that the spring is in a naturally extended or slightly compressed state, thereby providing outward elastic force to the two second rubber discharge baffles 760 and ensuring that the material passage gap 761 remains open.

[0098] During normal operation of the rolling mill for battery electrode production, the elastic element 770 continuously provides outward force to the two second rubber discharge baffles 760, ensuring that the material passage gap 761 remains open. This helps the electrode material to flow continuously and stably from the material passage gap 761, preventing the material passage gap 761 from accidentally closing due to elastic changes in the second rubber discharge baffles 760 or other factors, thus affecting the continuity of material output.

[0099] When the pumping material pulsates during the pumping of electrode material by gear 720, the material pressure within storage space 762 fluctuates. As previously mentioned, changes in material pressure cause the upper ends of the two second rubber discharge baffles 760 to move closer or further apart, correspondingly reducing or increasing the material passage gap 761 to buffer the pulsation. During this process, the elastic force of the elastic element 770 plays an auxiliary role. When the material pressure pushes the second rubber discharge baffles 760 to reduce the material passage gap 761, the elastic force of the elastic element 770 can resist some of the pressure, slowing down the reduction in the material passage gap 761 and preventing excessive contraction of the material passage gap 761 that could lead to poor material flow. Conversely, when the material pressure weakens, the elastic force of the elastic element 770 helps the second rubber discharge baffles 760 return to their appropriate position more quickly, ensuring the timely recovery of the material passage gap 761 and guaranteeing the stability of the material flow. Through the synergistic effect with the second rubber discharge baffles 760, the impact of pumping material pulsation on the uniformity of electrode thickness is further reduced.

[0100] Because the elastic element 770 ensures the stable opening of the material passage gap 761 and works in conjunction with the second rubber discharge baffle 760 to buffer pulsations, the electrode material flowing out of the discharge port 712 is more stable and uniform. This ensures the uniform distribution of the electrode material above the baffle space 600. When the metal foil passes through the baffle space 600 driven by the first pressure roller 200 and the second pressure roller 500, the electrode material can be uniformly coated on the surface of the metal foil. Subsequently, under the compaction action of the pressure rollers, the thickness uniformity of the electrode sheet is effectively guaranteed, thereby improving the quality of the battery electrode sheet.

[0101] The elastic element 770 ensures that the material passage gap 761 opens stably, effectively avoiding abnormal material discharge caused by the uncertainty of the second rubber discharge baffle 760, further enhancing the stability of material discharge, ensuring that the electrode material can flow out continuously and evenly, and providing a solid foundation for high-quality coating of the electrode sheet.

[0102] The elastic element 770 works in conjunction with the second rubber discharge baffle 760 to buffer pump material pulsation. It can adjust the variation of the material passage gap 761 in a timely manner during pulsation, making the buffering effect more precise and effective, significantly reducing the impact of pump material pulsation on the uniformity of electrode thickness, thereby improving the quality stability of the electrode.

[0103] By optimizing the stability and pulsation buffering effect of the discharge process, the addition of elastic component 770 improves the performance of the entire discharge assembly 700, thereby enhancing the reliability of the equipment during production. This reduces equipment failures and production interruptions caused by unstable discharge or pulsation issues, improves production efficiency, and lowers production costs.

[0104] In some examples, one of the first rubber discharge baffles 750 is positioned adjustablely. The position adjustment is used to change the abutment force at the lower ends of the two first rubber discharge baffles 750, thereby changing the material pumping rate required for the first rubber discharge baffles 750 to change from the blocked state to the open state.

[0105] For example, the adjustable position of the first rubber discharge baffle 750 allows for precise adjustment of the discharge timing and quantity according to actual production needs, making the discharge process more compatible with the requirements of different electrode materials and production processes. This further improves the accuracy of discharge control and helps to enhance the quality consistency of electrode coating.

[0106] This design allows the equipment to better adapt to a variety of electrode materials with different properties and diverse production processes. Whether it's a high-viscosity, low-flow electrode material or a production scenario requiring rapid material discharge, the requirements can be met by adjusting the position of the first rubber discharge baffle 750, enhancing the equipment's versatility and flexibility.

[0107] The discharge control system works in conjunction with other parts of the discharge assembly 700 to optimize the stability of the entire production process. This reduces production fluctuations caused by discharge mismatch, lowers the incidence of electrode quality problems, improves production efficiency and product quality, and provides a strong guarantee for the stable production of battery electrodes.

[0108] In some examples, the two first rubber discharge baffles 750 have a guide groove 751 on their adjacent sides. There are several guide grooves 751, which are arranged sequentially along the length of the first rubber discharge baffles 750. The guide grooves 751 of the two first rubber discharge baffles 750 are staggered.

[0109] For example, the guide groove 751 is processed on the side close to the first rubber discharge baffle 750 and is semi-cylindrical. This shape is conducive to guiding the flow of electrode material. It can effectively guide the electrode material and will not affect the structural strength of the first rubber discharge baffle 750 due to the guide groove being too large, or result in poor material guiding effect due to the guide groove being too small.

[0110] Several guide channels 751 are arranged sequentially along the length of the first rubber discharge baffle 750. The guide channels 751 on two first rubber discharge baffles 750 are staggered, that is, the guide channels on one baffle are offset from those on the other baffle in the direction perpendicular to the length of the baffle. This staggered arrangement allows the electrode material to be more evenly dispersed and mixed when passing between the two first rubber discharge baffles 750, avoiding local material concentration or uneven dispersion.

[0111] When the pump gear 720 pumps the electrode material and the first rubber discharge baffle 750 is in the open state, the electrode material flows out from the discharge port 712 and contacts the guide groove 751. The semi-cylindrical structure of the guide groove 751 guides the electrode material to flow along its shape, changing the direction of the material flow. Due to the staggered arrangement of the guide grooves 751 on the two first rubber discharge baffles 750, the electrode material flowing out from different guide grooves converges and collides with each other, further dispersing and mixing, making the electrode material more uniform before entering subsequent processes. This uniformly dispersed material flow helps to improve the uniformity of the electrode material coating on the metal foil, thereby improving the quality of the electrode sheet.

[0112] The material guide trough 751 works in conjunction with the position adjustment mechanism of the first rubber discharge baffle 750. By adjusting the position of one of the first rubber discharge baffles 750, the contact force at the lower ends of the two baffles is changed, thereby adjusting the material pumping rate required for discharge. During this process, the material guide trough 751 always plays a role in guiding and dispersing the material, ensuring that the electrode material can flow out evenly regardless of the discharge rate adjustment, and together with other parts of the entire discharge assembly 700, it ensures the stability of the discharge and the quality of the electrode coating.

[0113] The design and staggered arrangement of the feed channel 751 effectively guides and disperses the electrode material, making the electrode material more uniform after flowing out of the outlet 712. This significantly improves the uniformity of the electrode material coating on the metal foil, further enhancing the quality of the electrode sheet and reducing battery performance problems caused by uneven coating.

[0114] The guide chute 751 and the first rubber discharge baffle 750 position adjustment mechanism work together to ensure uniform discharge of electrode material while adjusting the discharge volume, thus optimizing the stability of the discharge. Regardless of changes in the production process, the stability of the discharge process is ensured, improving the equipment's adaptability to different production conditions.

[0115] By improving coating uniformity and output stability, equipment failures and production interruptions caused by electrode quality problems and unstable output are reduced, thereby enhancing equipment reliability, reducing maintenance costs, and improving production efficiency.

[0116] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A roll press device for producing a battery electrode sheet for roll pressing an electrode material coated on a metal foil, characterized by, The utility model relates to a metal foil electrode material coating device, including: Frame (100); First compression roller (200), first compression roller (200) rotation is arranged on frame (100); End compression roller (300), both ends of first compression roller (200) are provided with a group of end compression roller (300) respectively, and each group of end compression roller (300) is arranged along the circumference of first compression roller (200), and end compression roller (300) rotation is arranged on frame (100) between first compression roller (200) and is used for the edge of roller pressing metal foil; Arc-shaped side baffle (400), both ends of two groups of end compression roller (300) are provided with arc-shaped side baffle (400) respectively, and arc-shaped side baffle (400) is formed with arc-shaped gap between first compression roller (200), and arc-shaped gap is used for metal foil to pass; Second compression roller (500), second compression roller (500) rotation is arranged on frame (100), and it is inserted between two arc-shaped side baffles (400), and second compression roller (500) and first compression roller (200) are used for the electrode material coating on the roller pressing metal foil, and first compression roller (200), second compression roller (500) and two arc-shaped side baffles (400) form the material retaining space (600) for containing coating material between them, and the coating material contained in material retaining space (600) can be coated on metal foil and be rolled by first compression roller (200) and second compression roller (500); Still include discharge assembly (700), and discharge assembly (700) is used for sending electrode material for coating, is arranged above material retaining space (600), and it includes: Containing body (710), containing body (710) has material cavity (711), and the bottom of material cavity (711) has strip-shaped discharge port (712), and discharge port (712) is located above material retaining space (600); Pump material pair gear (720), pump material pair gear (720) is arranged in material cavity (711) and is located above discharge port (712); Slow flow frame (730), slow flow frame (730) is arranged between pump material pair gear (720) and discharge port (712), and both ends are arranged on two opposite cavity walls of material cavity (711) respectively, and slow flow frame (730) is long strip frame type; Slow flow fiber bundle (740), slow flow fiber bundle (740) is arranged in slow flow frame (730) and is used for the slow flow of electrode material.

2. The roll press device for battery electrode sheet production according to claim 1, characterized by, Slow flow fiber bundle (740) includes horizontal fiber bundle (741) and vertical fiber bundle (742), horizontal fiber bundle (741) is arranged in the upper portion of slow flow frame (730) along the horizontal direction, vertical fiber bundle (742) is arranged in the lower portion of slow flow frame (730) along the vertical direction, and the upper end of vertical fiber bundle (742) is arranged on horizontal fiber bundle (741). 3.The roller pressing device for battery electrode production of claim 1, wherein Discharge assembly (700) further includes: The first rubber discharge baffle (750) is two, two first rubber discharge baffles (750) are arranged at an angle, and the distance between two first rubber discharge baffles (750) gradually decreases from top to bottom until the lower end abuts, two first rubber discharge baffles (750) are located on both sides of the discharge port (712), and have a blocking state and an open state, the lower end abuts in the blocking state without external force, and the discharge port (712) is blocked, and the lower end separates in the open state under the action of the pump material on the gear (720).

4. The roll press device for battery electrode sheet production according to claim 3, characterized by, The discharge assembly (700) further comprises: The second rubber discharge baffle (760) is arranged on the inner wall of the first rubber discharge baffle (750), the distance between two second rubber discharge baffles (760) gradually decreases from bottom to top until the upper end has the smallest spacing to form a material passing gap (761), the material passing gap (761) is located below the slow flow fiber bundle (740), the second rubber discharge baffle (760) and the first rubber discharge baffle (750) form a material storage space (762), and the material storage space (762) is acted on by the material to push the upper end of two second rubber discharge baffles (760) to approach each other, so that the material passing gap (761) is reduced.

5. The roll press device for battery electrode sheet production according to claim 4, characterized by, The discharge assembly (700) further comprises: The elastic member (770) is located at the material passing gap (761), and the two ends act on two second rubber discharge baffles (760), respectively, for providing the force for keeping the material passing gap (761) open.

6. The roll press device for battery electrode sheet production according to claim 5, characterized by One of the first rubber discharge baffles (750) is adjustably arranged, and after position adjustment, it is used to change the abutting force of the lower end of two first rubber discharge baffles (750), so as to change the material pumping amount required for the first rubber discharge baffle (750) to change from the blocking state to the open state.

7. The roll press device for battery electrode sheet production according to claim 6, characterized by, The side of two first rubber discharge baffles (750) close to each other has a material guide groove (751), the material guide groove (751) is a plurality of, and is arranged in sequence along the length direction of the first rubber discharge baffle (750).

8. The roll press device for battery electrode sheet production according to claim 7, characterized by, The material guide grooves (751) of two first rubber discharge baffles (750) are arranged at different positions.

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