Electrode sheet calendering device and temperature control system

Abstract

The present application relates to an electrode sheet calendering device and a temperature control system. The electrode sheet calendering device comprises a preheating mechanism (200) and a calendering mechanism (400); the preheating mechanism comprises preheating rollers (210), the outer peripheral surface of each preheating roller is a heat conducting surface (211), and the heat conducting surface is adapted to be in contact with an electrode sheet (600) and used for heating the electrode sheet to a preset target temperature; a first liquid circulation flow channel is provided in each preheating roller, and the first liquid circulation flow channel is used for circulation of a heat conducting liquid; at least part of the first liquid circulation flow channel is arranged in the extension direction of the corresponding heat conducting surface, and the first liquid circulation flow channel is used for transferring heat of the heat conducting liquid to the corresponding heat conducting surface; the calendering mechanism is used for calendering the electrode sheet heated by the preheating mechanism to a target thickness. The solution provided in the present application can maintain the electrode sheet at an accurate calendering temperature during calendering, thereby improving the thickness uniformness of the electrode sheet after calendering.

Description

Electrode Roller Pressing Device and Temperature Control System

[0001] This application claims priority to Chinese Patent Application No. 202520169952.X, filed on January 24, 2025, entitled “Electrode Roller Pressing Device and Temperature Control System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of new energy, and in particular to electrode rolling devices and temperature control systems. Background Technology

[0003] In the production process of lithium battery electrodes, the coated electrodes need to be subjected to pressure using rollers to rearrange and compact the active material particles, binders, and conductive agents within the electrodes, thereby reducing the porosity of the electrodes and increasing their density.

[0004] In related technologies, due to the excessively fast heat exchange rate between the electrode sheet and the roll, the roll cannot maintain the initial set temperature. Even if some rolling equipment is equipped with a preheating device, the preheating device is difficult to maintain the accurate rolling temperature of the electrode sheet during the rolling process, which in turn leads to poor thickness consistency of the rolled electrode sheet.

[0005] Application content

[0006] In view of this, this application provides an electrode rolling device and a temperature control system, which can maintain an accurate rolling temperature of the electrode during the rolling process and improve the thickness consistency of the electrode after rolling.

[0007] The first aspect of this application provides an electrode rolling device, comprising:

[0008] A preheating mechanism includes a preheating roller, the outer circumferential surface of which is a heat-conducting surface for contacting an electrode sheet and heating the electrode sheet to a preset target temperature; wherein, a first liquid circulation channel is provided inside the preheating roller for supplying heat-conducting liquid; at least a portion of the first liquid circulation channel is arranged along the extension of the heat-conducting surface to transfer the heat of the heat-conducting liquid to the heat-conducting surface;

[0009] A rolling mechanism is used to roll the electrode sheet heated by the preheating mechanism to the target thickness.

[0010] In one embodiment, the first liquid circulation channel includes an inlet channel, a heat-conducting channel, and an outlet channel. The heat-conducting channel is arranged along the heat-conducting surface of the preheating roller. The heat-conducting channel is connected between the inlet channel and the outlet channel. The inlet channel is connected to the inlet port, and the outlet channel is connected to the outlet port.

[0011] In one embodiment, the liquid outlet channel and the liquid inlet channel extend along the axial direction of the preheating roller and are at least partially parallel or coaxially arranged; the liquid inlet channel extends from one axial end of the preheating roller to the other axial end of the preheating roller.

[0012] In one embodiment, the preheating roller includes a rotating shaft and a roller body integrally connected to the rotating shaft, and the liquid inlet channel and the liquid outlet channel are arranged along the rotating shaft;

[0013] The roller body includes a heat-conducting part away from the rotating shaft and a connecting part connecting the rotating shaft and the heat-conducting part. The heat-conducting surface is disposed on the outer wall of the heat-conducting part, and the heat-conducting flow channel is disposed in the heat-conducting part. The heat-conducting flow channel is connected to the liquid inlet flow channel and / or the liquid outlet flow channel via the connecting part.

[0014] In one embodiment, the preheating mechanism includes two preheating rollers, one of which is used to contact one side surface of the electrode sheet along the thickness direction, and the other preheating roller is used to contact the other side surface of the electrode sheet along the thickness direction; the two preheating rollers are arranged laterally at intervals.

[0015] In one embodiment, a temperature compensation mechanism is further included, which is disposed near the roller inlet of the roller pressing mechanism;

[0016] The heating compensation mechanism includes:

[0017] A heating element, positioned directly opposite the electrode, is used to conduct emitted heat to the electrode to compensate for the temperature of the electrode entering the rolling mechanism; and / or,

[0018] A cooling structure includes a coolant port and a coolant circulation channel connected to the coolant port. The coolant circulation channel is located inside or around the heating element and is used to cool the heating element with coolant.

[0019] In one embodiment, the rolling mechanism includes rollers for applying pressure to the electrode sheet;

[0020] The roll is provided with a second liquid circulation channel for the flow of heat-conducting liquid; at least a portion of the second liquid circulation channel is arranged along the extension of the roll pressing surface of the roll to transfer the heat of the heat-conducting liquid to the roll pressing surface.

[0021] In one embodiment, the system further includes a frame, which includes a first frame and a second frame. The first frame includes a vertical portion and a horizontal portion disposed at the top of the vertical portion. The vertical portion is fixed relative to the ground, and the horizontal portion extends to the second frame and is fixedly connected to the second frame.

[0022] The two preheating rollers of the preheating mechanism are installed on the transverse part of the first frame, the roller pressing mechanism is installed on the second frame, and an overhead area is formed at the bottom of the transverse part of the first frame.

[0023] A second aspect of this application provides a temperature control system, comprising:

[0024] The electrode rolling device as described in the first aspect above;

[0025] The first heat transfer fluid circulation device is fluidly connected to the first liquid circulation channel of the preheating mechanism and is used to provide heat transfer fluid to the first liquid circulation channel;

[0026] A preheating temperature control device is used to acquire first temperature information of the electrode at the preheating mechanism, and adjust the flow rate and / or temperature of the heat-conducting liquid in the first liquid circulation channel based on the first temperature information.

[0027] In one embodiment, the temperature control system further includes:

[0028] A temperature compensation control device, electrically connected to the temperature compensation mechanism, is used to acquire second temperature information of the electrode at the temperature compensation mechanism, and adjust the heat generation of the temperature compensation mechanism based on the second temperature information; and / or,

[0029] The second heat transfer fluid circulation device and the roller pressing temperature control device are fluidly connected to the second liquid circulation channel of the roller pressing mechanism and are used to provide heat transfer fluid to the second liquid circulation channel; the roller pressing temperature control device is used to adjust the flow rate and / or temperature of the heat transfer fluid in the second liquid circulation channel.

[0030] The technical solution provided in this application may include the following beneficial effects:

[0031] The electrode rolling device provided in this application has a first liquid circulation channel inside the preheating roller of the preheating mechanism. The preheating mechanism uses heat-conducting liquid circulating inside the preheating roller to heat the electrode. This not only avoids local overheating or overcooling of the preheating roller and makes the temperature of the heat-conducting surface of the preheating roller uniform, but also, by adjusting the flow rate and / or temperature of the heat-conducting liquid in the first liquid circulation channel, the temperature control accuracy of the heat-conducting surface of the preheating roller is improved. This allows the electrode to maintain an accurate rolling temperature during the rolling process and improves the thickness uniformity of the electrode after rolling.

[0032] Furthermore, the electrode rolling device provided in this application has a second liquid circulation channel inside the rolling mechanism. The rolling mechanism uses heat-conducting liquid circulating inside the rolling roll to keep the rolling roll at a constant initial set temperature, thereby avoiding the shrinkage of the rolling roll diameter due to temperature instability and further improving the uniformity of the electrode rolling thickness.

[0033] Furthermore, the temperature control system provided in this application, through the cooperation of a preheating control device and a rolling temperature control device, enables precise temperature control of the electrode sheet during the rolling process. This not only prevents the diameter of the roll from shrinking due to temperature changes, thus ensuring a consistent thickness of the rolled electrode sheet, but also enables automatic adjustment of preheating and temperature compensation, avoiding manual intervention in temperature adjustment and improving the production efficiency of the electrode sheet.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of the structure of the electrode rolling device shown in an embodiment of this application;

[0037] Figure 2 is a schematic diagram of the structure of the preheating roller of the electrode rolling device shown in an embodiment of this application;

[0038] Figure 3 is a partially enlarged schematic diagram of the preheating roller of the electrode rolling device shown in the embodiment of Figure 2 of this application at point B;

[0039] Figure 4 is a partially enlarged schematic diagram at point A of the electrode rolling device shown in the embodiment of Figure 1 of this application;

[0040] Figure 5 is a schematic diagram of the temperature compensation mechanism of the electrode rolling device shown in an embodiment of this application.

[0041] The markings in the diagram mean:

[0042] 100. Frame; 110. First frame; 111. Vertical section; 112. Horizontal section; 120. Second frame; 200. Preheating mechanism; 210. Preheating roller; 211. Heat-conducting surface; 212. Support shaft; 213. Rotary joint; 214. Liquid inlet port; 215. Liquid outlet port; 216. Rotating connector; 220. Liquid inlet channel; 221. Central shaft; 230. Heat-conducting channel; 231. Heat-conducting part; 240. 250. Liquid inlet channel; 251. Liquid outlet channel; 260. Liquid outlet channel; 300. Temperature compensation mechanism; 310. Heat collection component; 311. Heat conduction port; 320. Support; 321. Adjustment mechanism; 330. Coolant port; 340. Heating element; 350. Light transmission element; 400. Roller pressing mechanism; 410. Roller; 500. Tensioning roller; 510. Tensioning support; 520. Adjustment component; 600. Electrode.

[0043] Implementation methods of this application

[0044] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0049] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0050] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, 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 the embodiments of this application.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0052] In related technologies, there is a certain belt travel distance between the preheating device and the rolls, which results in a longer heat exchange time between the electrode and the air. This causes the temperature of the electrode to drop when it enters the rolls, making it difficult for the electrode rolling equipment in related technologies to maintain an accurate rolling temperature during the rolling process.

[0053] To address the aforementioned issues, this application provides an electrode rolling device and a temperature control system, which enables the electrode to maintain an accurate rolling temperature during the rolling process and improves the thickness consistency of the rolled electrode.

[0054] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0055] Figure 1 is a schematic diagram of the structure of the electrode rolling device shown in the embodiment of this application; Figure 2 is a schematic diagram of the structure of the preheating roller of the electrode rolling device shown in the embodiment of this application.

[0056] Referring to Figures 1 and 2, this application provides an electrode rolling device, which includes a preheating mechanism 200 and a rolling mechanism 400. The preheating mechanism 200 includes a preheating roller 210, the outer peripheral surface of which is a heat-conducting surface 211. The heat-conducting surface 211 is used to contact the electrode 600 and heat the electrode 600 to a preset target temperature. The preheating roller 210 is provided with a first liquid circulation channel for the flow of heat-conducting liquid. At least a portion of the liquid circulation channel is arranged along the extension of the heat-conducting surface 211, and the first liquid circulation channel is used to transfer the heat of the heat-conducting liquid to the heat-conducting surface 211. The rolling mechanism 400 is used to roll the electrode 600 heated by the preheating mechanism 200 to a target thickness.

[0057] The electrode rolling device provided in this application has a first liquid circulation channel in the preheating roller 210. Therefore, the preheating mechanism 200 uses heat-conducting liquid circulating in the preheating roller 210 to heat the electrode 600. This not only avoids local overheating or overcooling of the preheating roller 210 and makes the temperature of the heat-conducting surface 211 of the preheating roller 210 uniform, but also, by adjusting the flow rate and / or temperature of the heat-conducting liquid in the first liquid circulation channel, the temperature control accuracy of the heat-conducting surface 211 of the preheating roller 210 is higher. This enables the electrode 600 to maintain an accurate rolling temperature during the rolling process and improves the thickness consistency of the electrode after rolling.

[0058] The electrode 600 in this application is an electrode that has undergone coating and drying treatment. After being rolled and cut, the electrode can be used in lithium batteries.

[0059] The electrode 600 is a continuous elongated strip. When the electrode 600 is rolled, it travels between the preheating mechanism 200 and the rolling mechanism 400 at a predetermined speed. The electrode 600 is heated to a target temperature (e.g., 120°C) by the preheating mechanism 200, and then enters the rolling mechanism 400 to be hot-rolled to a preset thickness at the target temperature. This improves the density and conductivity of the electrode, thereby improving the performance of the battery using the electrode.

[0060] The heat transfer fluid can be a heat transfer oil with a high thermal conductivity. The heat transfer oil can transfer heat quickly and effectively, making the preheating process more efficient and reducing the preheating time. The heat transfer fluid can be evenly distributed in the first liquid circulation channel of the preheating roller 210, and the heat is evenly transferred to the heat-conducting surface 211 of the preheating roller 210 through heat conduction, thereby achieving more uniform heating of the electrode 600.

[0061] In related technologies, electric heating is generally used to heat the preheating roller. For example, heat is generated by installing heating elements such as resistance wires inside the preheating roller. However, due to limitations in the arrangement of heating elements, heat dissipation, and electrical insulation requirements, increasing the diameter of the preheating roller can lead to problems such as difficulty in ensuring thermal uniformity, reduced heating efficiency, and poor electrical safety.

[0062] Referring to Figure 2, the electrode rolling device provided in this application uses a heat-conducting liquid circulating in the first liquid circulation channel for preheating of the preheating roller 210. On the one hand, heat-conducting liquid circulation preheating does not require consideration of complex electrical wiring and insulation issues as electric heating, so it is not only safe, but also easier to achieve a larger diameter of the preheating roller 210, thereby increasing the preheating area of ​​the heat-conducting surface 211 of the preheating roller 210. On the other hand, it makes the temperature of the entire heat-conducting surface 211 of the preheating roller 210 uniform.

[0063] Figure 3 is a partially enlarged schematic diagram of the preheating roller at point B in the electrode rolling device shown in the embodiment of Figure 2 of this application.

[0064] Please refer to Figures 2 and 3 together. In some embodiments, the first liquid circulation channel of the preheating roller 210 includes an inlet channel 220, a heat conduction channel 230, and an outlet channel 260. The flow direction of the heat conduction liquid in the inlet channel 220, the heat conduction channel 230, and the outlet channel 260 is shown by the arrows in Figures 2 and 3.

[0065] The heat-conducting channel 230 is arranged along the heat-conducting surface 211 of the preheating roller 210. An inlet sub-channel 240 and an outlet sub-channel 250 are provided at both axial ends of the preheating roller 210. The inlet channel 220 connects the inlet port 214 and the inlet sub-channel 240, and the outlet channel 260 connects the outlet port 215 and the outlet sub-channel 250. With this arrangement, after the heat-conducting liquid enters the inlet port 214, it circulates along the surface of the preheating roller 210 via the first liquid circulation channel and is then output from the outlet port 215, forming a complete liquid circulation system. This ensures the stability and uniformity of the temperature of the heat-conducting surface 211 of the preheating roller 210.

[0066] In some embodiments, the preheating roller 210 has an inlet port 214 and an outlet port 215 on the same axial side. The inlet channel 220 extends from one axial end of the preheating roller 210 to the other axial end of the roller body. The outlet channel 260 extends along the axial direction of the preheating roller 210 as well as the inlet channel 220, and the outlet channel 260 and the inlet channel 220 are at least partially parallel or coaxially arranged. When the outlet channel 260 is a single channel, the outlet channel 260 is arranged around the inlet channel, and the two are coaxially arranged. When the outlet channel 260 is multiple channels, the multiple outlet channels 260 are distributed in a ring around the inlet channel, and each outlet channel 260 is parallel or parallel to the inlet channel 220.

[0067] The heat transfer fluid introduced from the inlet port 214 flows in the inlet channel 220 to the end of the roller body away from the inlet port 214, and is then evenly introduced into the heat transfer channel 230 in the circumference of the preheating roller 210. After the heat transfer channel 230 is full, the heat transfer fluid is discharged to the outlet through the outlet channel 260.

[0068] In this application, since the inlet port 214 and outlet port 215 are both located at the same axial end of the preheating roller 210, the external liquid supply pipeline and return pipeline can be centrally connected to the same side of the preheating roller 210. This results in a more compact and simple pipeline layout, reducing pipeline length and complexity, and lowering installation difficulty and cost. Furthermore, placing the inlet port 214 and outlet port 215 at the same end of the preheating roller 210 reduces the torque and unbalanced force generated on the preheating roller 210 during the inflow and outflow of the heat transfer liquid in the first liquid circulation channel. This makes the force on the preheating roller 210 more uniform during rotation, thereby improving the operational stability of the preheating mechanism 200.

[0069] Referring again to Figure 2, in some embodiments, the preheating roller 210 includes a central shaft 221 and a roller body integrally connected to the central shaft 221. The central shaft 221 is a hollow shaft with an internal liquid inlet channel 220. The roller body is cylindrical, and the heat-conducting surface 211 is the outer peripheral surface of the cylinder. The heat-conducting surface 211 is smooth, which can ensure good contact with the electrode 600 and achieve uniform heat conduction to the electrode 600.

[0070] The preheating roller 210 can be made of high-strength, thermally conductive metal materials, such as steel or copper alloys. Steel rollers have high strength and wear resistance, and can withstand greater pressure and friction; copper alloy rollers have better thermal conductivity, which allows heat to be transferred more evenly to the roller surface.

[0071] In some embodiments, the inlet channel 220 and the outlet channel 260 are arranged along the central axis 221 of the preheating roller 210. The roller body includes a heat-conducting part 231 away from the central axis 221 and a connecting part 251 connecting the central axis 221 and the heat-conducting part 231. The heat-conducting channel 230 is disposed on the heat-conducting part 231. The outer wall of the heat-conducting part 231 is a heat-conducting surface 211. The heat-conducting channel 230 communicates with the inlet channel 220 and / or the outlet channel 260 via the connecting part 251. The inlet sub-channel 240 and the outlet sub-channel 250 are disposed at two connecting parts 251 at both ends of the axial direction of the preheating roller 210.

[0072] In some embodiments, multiple heat-conducting channels 230 are provided, which are parallel to each other and arranged in a ring along the circumference of the preheating roller. Correspondingly, multiple liquid inlet channels 240 and liquid outlet channels 250 are also provided, corresponding one-to-one with the heat-conducting channels 230. The liquid inlet channels 240 and liquid outlet channels 250 are arranged radially around the axis of the preheating roller 210. One end of the multiple liquid inlet channels 240 is connected to the liquid inlet channel, and the other end of the multiple liquid inlet channels 240 is connected to the corresponding heat-conducting channel. Correspondingly, one end of the multiple liquid outlet channels 250 is connected to the multiple heat-conducting channels, and the other end is connected to the liquid outlet channel 260.

[0073] In some embodiments, the heat conduction channel 230 may also be a heat conduction cavity disposed in the preheating roller 210, and the heat conduction cavity is in a connected state in the circumferential direction of the preheating roller; or, the heat conduction channel 230 may also be a structure arranged in a straight line or a curved line in the preheating roller 210.

[0074] It is worth noting that this application does not limit the structural form of the first liquid circulation channel. In other embodiments, it can be set according to different structural features of the preheating roller 210.

[0075] Referring to Figure 2, in this application, the first liquid circulation channel is symmetrically arranged inside the preheating roller 210 with the central axis 221 of the preheating roller 210 as the reference. This ensures that the heat transfer liquid is evenly distributed around the roller body, so that each part of the heat transfer surface 211 of the preheating roller 210 can be evenly heated, reducing the temperature deviation of the heat transfer surface 211.

[0076] Referring to Figure 1, in some embodiments, the preheating mechanism 200 includes two preheating rollers 210, one of which is used to contact one side surface of the electrode 600 along the thickness direction, and the other is used to contact the other side surface of the electrode 600 along the thickness direction.

[0077] The two preheating rollers 210 can rotate synchronously. During synchronous rotation, the electrode 600 is in close contact with the heat-conducting surface 211 of the roller body, so that the two roller bodies can evenly transfer heat to both sides of the electrode. Compared with a single preheating roller 210, the two preheating rollers 210 heat both sides of the electrode 600 at the same time, increasing the contact area between the electrode 600 and the heat source of the heat-conducting surface 211, thereby heating the electrode 600 to the required target temperature in a shorter time.

[0078] Referring again to Figure 1, in this embodiment of the application, the two preheating rollers 210 are arranged at intervals in the transverse (or horizontal) direction. This makes the distance between the preheating mechanism 200 and the rolling mechanism 400 smaller, and the electrode 600 has a higher tightness between the preheating mechanism 200 and the rolling mechanism 400. This reduces the number of electrode tensioning rollers required. For example, in related technologies, two or more tensioning rollers are generally required between the preheating mechanism 200 and the rolling mechanism 400 to achieve electrode tensioning during the transmission process. However, this application only requires one tensioning roller 500 to achieve electrode tensioning during the transmission process, which simplifies the equipment structure and reduces costs.

[0079] In this embodiment, the tension roller 500 is fixedly disposed relative to the preheating roller 210 and is fixed by the tension bracket 510. The tension bracket 510 is provided with an adjustment member 520. The tension roller is movably installed on the adjustment member 520 and can be positioned at a predetermined position of the adjustment member 520, thereby adjusting the tension of the electrode 600.

[0080] Referring to Figure 1, the electrode rolling device of this application also includes a frame 100, which is fixed relative to the ground, and the preheating mechanism 200 and the rolling mechanism 400 are installed on the frame 100.

[0081] In some embodiments, the frame 100 may include a first frame 110 and a second frame 120. The first frame 110 includes a vertical portion 111 and a horizontal portion 112 located at the top of the vertical portion 111. The vertical portion 111 is fixed relative to the ground, and the horizontal portion 112 extends to and connects to the second frame 120. The two preheating rollers 210 of the preheating mechanism 200 are mounted on the horizontal portion 112 of the first frame 110. The horizontal portion 112 of the first frame 110 has a predetermined height, forming an overhead area H at the bottom of the two preheating rollers 210. This overhead area H facilitates maintenance or repair operations on the two preheating rollers 210 and the rolling mechanism 400 by maintenance or repair personnel.

[0082] Referring to Figures 1 and 2, in some embodiments, the preheating roller 210 is provided with a support shaft 212 along its axial direction. The support shaft 212 is rotatably mounted on the first frame 110. The support shaft 212 serves to support the roller body and transmit power. The support shaft 212 is made of high-strength steel and can be connected to the roller body by welding, key connection, interference fit or integral molding, etc.

[0083] The preheating roller 210 is rotatably mounted on the first frame 110 via a rotary joint 213. The liquid inlet port 214 and the liquid outlet port 215 of the preheating roller 210 are located on the rotary joint 213. The rotary joint 213 is connected between the support shaft 212 and the first frame 110 via a rotary connector 216. The rotary connector 216 is used to reduce the friction between the support shaft 212 and the first frame 110, so that the preheating roller 210 can rotate smoothly.

[0084] Referring to Figure 1, the rolling mechanism 400 of the electrode rolling device of this application includes two longitudinally opposed rollers 410. The two rollers are mounted on the second frame 120. The side between the two rollers 410 near the preheating mechanism 200 is the electrode rolling inlet. The electrode 600 can be transversely transmitted to the two rollers 410 through the rolling inlet, so that the two rollers 410 apply pressure to the electrode 600 on the upper and lower sides.

[0085] The roll 410 is provided with a second liquid circulation channel (not shown) for the flow of heat transfer fluid; at least a portion of the second liquid circulation channel is arranged along the extension of the roll pressing surface of the roll 410, and the second liquid circulation channel is used to transfer the heat of the heat transfer fluid to the roll pressing surface, thereby causing the roll 410 to apply pressure to the electrode 600 at a set temperature.

[0086] The solution of this application also includes a first drive device for driving the preheating roll 210 and a second drive device for driving the rolling roll 410. The first drive device is installed on the first frame 110, and the second drive device is installed on the second frame 120. The first drive device and the second drive device can be devices such as motors and reducers.

[0087] The first drive device is connected to the preheating roller 210 via a first transmission mechanism, providing rotational power to the preheating roller 210 so that it can rotate at a set speed and direction, thereby achieving continuous preheating of the moving electrode sheet. The second drive device is connected to the rolling mill 410 via a second transmission mechanism, providing rotational power to the rolling mill 410 so that it can rotate at a set speed and direction, thereby achieving continuous pressure application to the moving electrode sheet. The first and second transmission mechanisms may include, but are not limited to, transmission belts, chains, or gears.

[0088] Figure 4 is a partially enlarged schematic diagram of the electrode rolling device shown in the embodiment of Figure 1 of this application at point A; Figure 5 is a structural schematic diagram of the heat compensation mechanism of the electrode rolling device shown in the embodiment of this application.

[0089] Please refer to Figures 4 and 5 together. In some embodiments, the electrode rolling device also includes a temperature compensation mechanism 300. When the temperature of the electrode 600 before entering the rolling inlet is lower than the target temperature, the temperature compensation mechanism 300 is used to reheat the electrode 600 so that the electrode entering the rolling mechanism 400 maintains a constant target temperature.

[0090] Since the heating compensation mechanism 300 of this application is located near the rolling inlet of the rolling mechanism 400, the heated electrode 600 can enter the rolling mechanism 400 in a shorter time, reducing the heat loss of the electrode 600 during the transfer process between the heating compensation mechanism 300 and the rolling mechanism 400, so that the electrode 600 can maintain a stable target temperature when it is rolled.

[0091] During the rolling process, the electrode 600 passes over the top surface of one of the preheating rollers 210, then over the bottom surface of the other preheating roller 210, and then over the tension roller 500 before entering the heat replenishment mechanism 300. The electrode 600 is transferred laterally between the preheating mechanism 200 and the heat replenishment mechanism 300. Compared with the electrode transfer path in related technologies, this reduces the path distance of the electrode 600 during the transfer process between the preheating mechanism 200 and the heat replenishment mechanism 300. The preheated electrode 600 can enter the heat replenishment mechanism 300 in a shorter time, reducing the heat loss of the electrode during the transfer process and reducing the dwell time of the electrode 600 in the non-heated area. This ensures that the electrode 600 can quickly enter the heat replenishment mechanism 300 and the rolling mechanism 400 after preheating.

[0092] Please refer to Figures 4 and 5. In some embodiments, the heat compensation mechanism 300 includes a heating element positioned opposite the electrode 600. The heating element conducts the emitted heat to the electrode 600 to compensate for the temperature of the electrode 600 before it enters the rolling mechanism 400. Specifically, the heating element includes a heat-concentrating component 310 and a heating element 340 disposed within the heat-concentrating component 310. The heating element 340 is disposed along the width direction of the electrode 600 and parallel to the surface of the electrode 600. The heat-concentrating component 310 includes a heat-conducting port 311 opposite to the electrode. The heat emitted by the heating element 340 is conducted to the electrode through the heat-conducting port 311. A light-transmitting element 350 is provided at the heat-conducting port 311, which encloses the heating element within the heat-concentrating component 310.

[0093] In some embodiments, the temperature compensation mechanism 300 includes two heating elements positioned vertically opposite each other, arranged along the width of the electrode sheet. The two heating elements are located on the upper and lower sides of the electrode sheet, respectively, and are used to heat the upper and lower surfaces of the electrode sheet. This improves the heating efficiency of the electrode sheet during temperature compensation. The two heating elements are fixed by a bracket 320, which is provided with an adjustment mechanism 321 for adjusting the position of the heating elements, thereby changing the distance between the heating elements and the surface of the electrode sheet 600.

[0094] In some embodiments, the heating direction of the heating element is perpendicular to the surface of the electrode 600, and the distance between the two heating elements and the electrode is the same. The arrangement direction of the two heating elements is parallel to the arrangement direction of the two rolls 410, that is, both are arranged in a vertical direction, and the electrode passing through the heating elements can enter the roll pressing inlet between the two rolls 410 in a horizontal direction.

[0095] In this embodiment, the heating element 340 can be an infrared lamp. The infrared lamp directly transfers energy to the electrode through infrared heating, without the need for heat conduction through an intermediate medium. It heats up quickly and can bring the electrode to the required target temperature in a short time.

[0096] The heat-concentrating component 310 is made of a high-reflectivity material, such as a gold-plated coating, which can directionally reflect and concentrate the light emitted by the infrared lamp tube, so that the infrared rays are more concentrated and uniformly irradiated onto the electrode through the heat conduction port 311, thereby improving the utilization rate of infrared radiation energy and reducing energy loss. In addition, the heat-concentrating component 310 can reflect the light of the infrared lamp tube onto the surface of the electrode more uniformly, thereby achieving uniform heating of the electrode and avoiding local overheating or undercooling of the electrode.

[0097] Referring to Figure 4, in some embodiments, the cooling structure includes a coolant port 330 and a coolant circulation channel communicating with the coolant port 330. The coolant circulation channel is located inside or outside the heat-collecting component 310. The coolant port 330 includes an inlet and an outlet. Coolant can flow into the coolant circulation channel through the inlet of the coolant port 330 and finally flow out through the outlet, thus realizing the circulation of coolant. Through the high-speed flow of low-temperature coolant, the heat of the heat-collecting component 310 is carried away, so that a safe and constant temperature environment is formed inside the heat-collecting component 310.

[0098] To achieve precise control of the electrode rolling temperature, this application also provides a temperature control system, which includes the electrode rolling device as described in the above embodiment, a first heat-conducting liquid circulation device, and a preheating temperature control device. The first heat-conducting liquid circulation device is fluidly connected to the first liquid circulation channel of the preheating mechanism 200 and is used to provide heat-conducting liquid to the first liquid circulation channel; the preheating temperature control device is used to acquire first temperature information of the electrode at the preheating mechanism 200, and adjust the flow rate and / or temperature of the heat-conducting liquid in the first liquid circulation channel based on the first temperature information.

[0099] The first heat transfer fluid circulation device can be a circulation pump, which is fluidly connected to the liquid circulation channel of the preheating mechanism 200, for example, through a pipe. The first heat transfer fluid circulation control device also includes a heat transfer fluid heating device. The preheating temperature control device regulates the flow rate and velocity of the heat transfer fluid by controlling the rotation speed of the circulation pump, and regulates the temperature of the heat transfer fluid in the preheating roller by controlling the heating power of the heat transfer fluid heating device.

[0100] A first temperature sensor is provided at the preheating mechanism 200 of the electrode rolling device. The first temperature sensor is used to sense the first temperature information of the electrode. The preheating control device can send a control signal to the heat transfer fluid circulation device to adjust the flow rate and / or temperature of the heat transfer fluid based on the first temperature information, so as to adjust the flow rate and / or temperature of the heat transfer fluid. The first temperature sensor can be installed inside the preheating roller 210, at the inlet port 214 or the outlet port 215, and can monitor the temperature change inside the preheating roller 210 in real time.

[0101] When the first temperature sensor detects that the temperature of the preheating roller 210 is lower than the set target temperature (e.g., 120°C), the preheating control device controls the heating device to increase the heating power of the heat transfer fluid, so that the heat transfer fluid heats up quickly, thereby increasing the temperature of the preheating roller 210; when the temperature approaches or reaches the target temperature, the preheating control device controls the heating device to automatically reduce the heating power of the heat transfer fluid, enter the heat preservation state, and maintain the temperature of the heat transfer fluid stable.

[0102] In some embodiments, the temperature control system also includes a cooling device. When the temperature of the preheating roller 210 exceeds the target temperature, the preheating control device controls the cooling device to work to reduce the temperature of the heat transfer fluid, or uses air cooling to assist in cooling, so that the temperature of the preheating roller 210 quickly drops back to the target temperature.

[0103] In some embodiments, the temperature control system further includes a temperature compensation control device electrically connected to the temperature compensation device, used to acquire second temperature information of the electrode, and send a control signal to the temperature compensation mechanism 300 to adjust the heat generation of the heating element based on the second temperature information, so as to adjust the heat generation of the heating element of the temperature compensation mechanism 300.

[0104] In this embodiment, a second temperature detection element is provided at the temperature compensation mechanism 300. The second temperature detection element is used to sense the second temperature information of the electrode sheet. When the second temperature of the electrode sheet is lower than the preset target temperature when it moves to the heating mechanism, the temperature compensation control device controls the heating element 340 to work. The heat emitted by the heating element 340 can reheat the electrode sheet after it has been heated by the preheating roller 210, so that the electrode sheet entering the rolling mechanism 400 is always at the preset target temperature, thereby achieving precise control of electrode sheet temperature compensation.

[0105] In some embodiments, the temperature control system further includes a second heat transfer fluid circulation device and a roll forming temperature control device. The second heat transfer fluid circulation device is fluidly connected to the second liquid circulation channel of the roll forming mechanism 400 and is used to provide heat transfer fluid to the second liquid circulation channel. The roll forming temperature control device is used to acquire the temperature information of the roll 410 of the roll forming mechanism 400 and adjust the flow rate and / or temperature of the heat transfer fluid in the second liquid circulation channel based on the temperature information, thereby achieving precise control of the temperature of the roll 410.

[0106] The temperature control system of this application, through the cooperation of a preheating control device, a supplementary temperature control device, and a rolling temperature control device, enables precise temperature control of the electrode sheet during the rolling process. This not only prevents the diameter of the roll from shrinking due to temperature changes, thus ensuring a consistent thickness of the rolled electrode sheet, but also enables automatic adjustment of preheating and supplementary temperature, avoiding manual intervention in temperature adjustment and improving the production efficiency of the electrode sheet.

[0107] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An electrode rolling device, characterized in that, include: A preheating mechanism includes a preheating roller, the outer circumferential surface of which is a heat-conducting surface for contacting an electrode to heat the electrode to a preset target temperature; wherein, a first liquid circulation channel is provided inside the preheating roller for supplying heat-conducting liquid; at least a portion of the first liquid circulation channel is arranged along the extension of the heat-conducting surface to transfer the heat of the heat-conducting liquid to the heat-conducting surface; A rolling mechanism is used to roll the electrode sheet heated by the preheating mechanism to the target thickness.

2. The electrode rolling device according to claim 1, characterized in that: The first liquid circulation channel includes an inlet channel, a heat-conducting channel, and an outlet channel; The heat-conducting channel is arranged along the heat-conducting surface of the preheating roller; the heat-conducting channel is connected between the liquid inlet channel and the liquid outlet channel, the liquid inlet channel is connected to the liquid inlet port, and the liquid outlet channel is connected to the liquid outlet port.

3. The electrode rolling device according to claim 2, characterized in that: The liquid outlet channel and the liquid inlet channel extend along the axial direction of the preheating roller, and are at least partially arranged in parallel or coaxially. The liquid inlet channel extends from one axial end of the preheating roller to the other axial end of the preheating roller.

4. The electrode rolling device according to claim 2, characterized in that: The preheating roller includes a rotating shaft and a roller body integrally connected to the rotating shaft, and the liquid inlet channel and the liquid outlet channel are arranged along the rotating shaft; The roller body includes a heat-conducting part away from the rotating shaft and a connecting part connecting the rotating shaft and the heat-conducting part. The heat-conducting surface is disposed on the outer wall of the heat-conducting part, and the heat-conducting flow channel is disposed in the heat-conducting part. The heat-conducting flow channel is connected to the liquid inlet flow channel and / or the liquid outlet flow channel via the connecting part.

5. The electrode rolling device according to claim 1, characterized in that: The preheating mechanism includes two preheating rollers, one of which is used to contact one side surface of the electrode sheet along the thickness direction, and the other preheating roller is used to contact the other side surface of the electrode sheet along the thickness direction; the two preheating rollers are arranged laterally at intervals.

6. The electrode rolling device according to claim 1, characterized in that: It also includes a temperature compensation mechanism, which is located near the roller pressing inlet of the roller pressing mechanism; The heating compensation mechanism includes: A heating element, positioned directly opposite the electrode, is used to conduct emitted heat to the electrode to compensate for the temperature of the electrode entering the rolling mechanism; and / or, A cooling structure includes a coolant port and a coolant circulation channel connected to the coolant port. The coolant circulation channel is located inside or around the heating element and is used to cool the heating element with coolant.

7. The electrode rolling device according to claim 1, characterized in that: The rolling mechanism includes rollers for applying pressure to the electrode sheet; The roll is provided with a second liquid circulation channel for the flow of heat-conducting liquid; at least a portion of the second liquid circulation channel is arranged along the extension of the roll pressing surface of the roll to transfer the heat of the heat-conducting liquid to the roll pressing surface.

8. The electrode rolling device according to any one of claims 1-7, characterized in that: It also includes a frame, which includes a first frame and a second frame. The first frame includes a vertical part and a horizontal part located at the top of the vertical part. The vertical part is fixed relative to the ground, and the horizontal part extends to the second frame and is fixedly connected to the second frame. The two preheating rollers of the preheating mechanism are installed on the transverse part of the first frame, the roller pressing mechanism is installed on the second frame, and an overhead area is formed at the bottom of the transverse part of the first frame.

9. A temperature control system, characterized in that, include: The electrode rolling device as described in any one of claims 1-8; The first heat transfer fluid circulation device is fluidly connected to the first liquid circulation channel of the preheating mechanism and is used to provide heat transfer fluid to the first liquid circulation channel; A preheating temperature control device is used to acquire first temperature information of the electrode at the preheating mechanism, and adjust the flow rate and / or temperature of the heat-conducting liquid in the first liquid circulation channel based on the first temperature information.

10. The temperature control system according to claim 9, characterized in that, The electrode rolling device includes a temperature compensation mechanism, and the temperature control system further includes: A temperature compensation control device, electrically connected to the temperature compensation mechanism, is used to acquire second temperature information of the electrode at the temperature compensation mechanism, and adjust the heat generation of the temperature compensation mechanism based on the second temperature information; and / or, The second heat transfer fluid circulation device and the roller pressing temperature control device are fluidly connected to the second liquid circulation channel of the roller pressing mechanism and are used to provide heat transfer fluid to the second liquid circulation channel; the roller pressing temperature control device is used to adjust the flow rate and / or temperature of the heat transfer fluid in the second liquid circulation channel.

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