Battery cell, electrode sheet manufacturing device, and battery manufacturing apparatus

Abstract

The application discloses a battery monomer, a pole piece manufacturing device and a battery manufacturing equipment. The pole piece manufacturing device comprises a transmission roller, a winding roller and a hot pressing roller. The transmission roller is used for driving the pole piece to move. The winding roller is rotatable to wind the pole piece. The hot pressing roller is arranged on a pole piece transmission path between the transmission roller and the winding roller, and the hot pressing roller can rotate along with the movement of the pole piece. The hot pressing roller is internally provided with a medium flow channel. The medium flow channel is used for flowing constant-temperature medium to heat the hot pressing roller, so that the pole piece is heated when passing through the hot pressing roller. The technical scheme of the application can heat the electrode pole piece after cold pressing, thereby accelerating the stress release of the pole piece, reducing the risk of swelling and deformation of the electrode pole piece after being assembled into a shell, and improving the stability of the battery monomer in the running process.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, an electrode manufacturing apparatus, and battery manufacturing equipment. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, and power tools.

[0003] The electrode plates in a battery are one of the most important components. During the production process of the electrode plates, they usually expand and deform. How to reduce the expansion and deformation of the electrode plates in the manufacturing process is also one of the research problems in this field. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, an electrode manufacturing apparatus, and a battery manufacturing equipment, which can release stress on the cold-pressed electrode sheets, reduce the risk of expansion and deformation after the electrode sheets are assembled into the casing, and improve the stability of the battery cell during operation.

[0005] In a first aspect, this application provides an electrode manufacturing apparatus, including a drive roller, a take-up roller, and a hot press roller. The drive roller is used to drive the electrode to move. The take-up roller is configured to rotate to wind the electrode. The hot press roller is disposed on the electrode transport path between the drive roller and the take-up roller, and the hot press roller can rotate as the electrode moves. The hot press roller has a medium flow channel. The medium flow channel is used to supply a constant-temperature medium to heat the hot press roller, so that the electrode is heated when passing through the hot press roller.

[0006] In the technical solution of this application embodiment, the rotational design of the drive roller and the take-up roller, combined with the rotation of the hot press roller and the uninterrupted supply of the constant temperature medium, forms a continuous production process. The electrode sheet, guided by the drive roller, is heated by the hot press roller and then stably wound by the take-up roller. The entire process requires no frequent machine stops for manual intervention or adjustment, enabling long-term continuous production, improving production efficiency, and reducing production costs. Specifically, the hot press roller heats and presses the electrode sheet during transport, continuously and uniformly applying heat and pressure to the electrode sheet surface during rotation. This effectively releases the internal stress of the electrode sheet after cold pressing, allowing the electrode sheet thickness to rebound and making the electrode sheet surface smoother. Furthermore, the constant temperature medium maintains a stable temperature for the hot press roller, resulting in more uniform rebound of the electrode sheet and improving the overall thickness consistency of the electrode sheet. Therefore, the amount of thickness expansion and deformation during the operation of the electrode assembly can be reduced, improving the stability of the battery cell during operation.

[0007] In some embodiments, the number of hot pressing rollers is at least one set, and each set of hot pressing rollers includes two sub-rollers. The two sub-rollers are arranged at intervals along the conveying path of the electrode sheet and are respectively located on opposite sides of the electrode sheet. The two sub-rollers are located on opposite sides of the electrode sheet and hot press it during the electrode sheet conveying process. This arrangement allows the upper and lower surfaces of the electrode sheet to be subjected to uniform pressure and heat simultaneously, avoiding problems such as electrode sheet deformation and uneven thickness that may be caused by unilateral hot pressing. The simultaneous hot pressing of the electrode sheet by the two sub-rollers can complete the heating and compaction process of the electrode sheet in a shorter time. Compared with the unilateral gradual heating and rolling method, this simultaneous action can shorten the hot pressing time, speed up the production of electrode sheets, and meet the needs of large-scale production.

[0008] In some embodiments, the electrode length L between the two sub-rollers in each set of hot pressing rollers is 200mm ≤ L ≤ 3000mm. With this structure, the electrode can dissipate heat sufficiently after passing the first sub-roller, allowing the electrode on the first side to fully release stress and rebound. When passing the second sub-roller, the first side has already completed stress release and rebound, and the second side begins to undergo hot pressing to release internal stress. Within this length range, the electrode has sufficient time to receive heat transfer between the two sub-rollers. If the length L is less than 200mm, the residence time of the electrode between the hot pressing rollers is too short, and heat cannot be fully transferred to the interior of the electrode, resulting in uneven heating, a large temperature difference between the surface and the interior, and affecting the performance and distribution of the active material in the electrode. When L is between 200mm and 3000mm, heat can be transferred more evenly from the hot pressing rollers to all parts of the electrode, allowing the entire electrode to reach a suitable hot pressing temperature and ensuring the stability of the hot pressing effect.

[0009] In some embodiments, the electrode manufacturing apparatus further includes a tension roller and a correction roller. The tension roller is disposed on the electrode transport path between two adjacent sets of hot press rollers to maintain electrode transport tension. The correction roller is disposed on the electrode transport path and upstream of the tension roller to correct electrode misalignment. The axes of both the tension roller and the correction roller are parallel to the axes of the hot press rollers. In this structure, the tension roller applies controllable tension to the electrode through physical contact, and its parallel axis design ensures uniform tension distribution. The tandem arrangement of the correction roller and the tension roller, with their parallel axes, ensures that the direction of the correction force is perpendicular to the generatrix of the hot press rollers, reducing the risk of electrode displacement or twisting. Stable tension improves the uniformity of pressure between the hot press rollers and the electrode, while the correction roller reduces the risk of unilateral overheating of the electrode. This structure improves the consistency of the electrode's springback thickness.

[0010] In some embodiments, the hot press roller has multiple media channels, which are evenly spaced along the circumference of the hot press roller. This structure, with multiple media channels evenly distributed along the circumference of the hot press roller, enables the constant-temperature medium to form a uniform heat exchange network inside the roller body. This improves the process consistency and product performance of the electrode sheets, while reducing energy consumption and maintenance costs.

[0011] In some embodiments, the medium flow channel includes an inlet channel, an outlet channel, and a connecting channel. The inlet channel extends axially along the hot press roller, and its inlet end is connected to the constant temperature medium supply system. The outlet channel extends axially along the hot press roller, and its outlet end is connected to the constant temperature medium supply system. The two ends of the connecting channel are respectively connected to the inlet channel and the outlet channel to form a continuous medium circulation path. In the above structure, the constant temperature medium flows sequentially through the inlet channel, the connecting channel, and the outlet channel, continuously heating the hot press roller at a constant temperature. The constant temperature medium can fully contact the inner wall of the hot press roller in the axial direction, uniformly transferring heat to the hot press roller, thereby ensuring the uniformity of the surface temperature of the hot press roller in the axial direction. When the electrode contacts the hot press roller, all parts of the electrode can be uniformly heated, avoiding local overheating or undercooling of the electrode due to uneven temperature, effectively improving the heating quality of the electrode. A continuous media circulation path ensures the constant flow of the thermostatic medium within the hot press roller, preventing stagnation or accumulation in localized areas. Precise control of the inlet temperature and flow rate through the thermostatic medium supply system stably maintains the temperature of the hot press roller within the set range, reducing the impact of temperature fluctuations on the electrode heating quality. Stable temperature control helps improve the repeatability and consistency of the electrode manufacturing process, reduces scrap rates, and enhances the reliability of the equipment.

[0012] In some embodiments, the inlet channel has a circular cross-section with an inner diameter D1 of 5mm ≤ D1 ≤ 100mm. The outlet channel has a circular cross-section with an inner diameter D2 of 5mm ≤ D2 ≤ 100mm. In the above structures, the circular cross-section has the smallest perimeter compared to rectangular or triangular pipes for the same cross-sectional area. Friction between the fluid and the pipe wall is one of the main causes of flow resistance when the fluid flows inside the pipe. The smaller the perimeter, the smaller the contact area between the fluid and the pipe wall, thus reducing flow resistance. This allows the isothermal medium to flow more smoothly in the inlet and outlet channels, reducing energy loss and improving the efficiency of medium circulation. The streamlined structure of the circular pipe helps maintain a laminar flow state. When the fluid velocity is moderate and the pipe inner diameter is within a certain range, the fluid in the circular pipe is more likely to form a stable laminar flow, which is relatively stable and has less energy loss.

[0013] In some embodiments, the working outer diameter D of the hot press roller is 10mm ≤ D ≤ 300mm. In the above structure, if the outer diameter is too small, the contact area between the hot press roller and the electrode is relatively small, and the heat transfer range is limited, which may lead to local overheating of the electrode while other parts are underheated, affecting the consistency of the electrode performance. Similarly, an excessively large outer diameter may increase heat loss during the heat transfer process due to a longer heat transfer path, which in turn affects the heating uniformity. When the working outer diameter of the hot press roller is within a suitable range, the uniform heating of the electrode can be better guaranteed.

[0014] In some embodiments, the hot press roller includes a fixed shaft and a roller. The fixed shaft is used to mount the hot press roller to a frame. The roller is sleeved on the fixed shaft, and a medium flow channel is provided inside the roller. The inlet and outlet ends of the medium flow channel are both oriented towards the same end of the roller. In the above structure, the fixed shaft is used to mount the hot press roller to the frame, which makes the installation operation relatively simple. When maintenance or replacement of the hot press roller is required, the roller can be easily removed from the fixed shaft since it is sleeved on the fixed shaft. Moreover, the fact that the inlet and outlet ends of the medium flow channel are both oriented towards the same end of the roller makes it easier to connect or disconnect the medium pipeline. The fact that the inlet and outlet ends of the medium flow channel are located at the same end of the roller optimizes the circulation path of the constant temperature medium. After the constant temperature medium enters the medium flow channel from the inlet end, it can flow inside the roller along a relatively reasonable path, fully exchanging heat with the inner wall of the roller, thereby more effectively transferring heat to the roller. Compared to designs where the inlet and outlet are located at different ends of the roller, this design reduces energy loss and flow resistance during the flow process, improves heat transfer efficiency, and enables the roller to reach and maintain the required temperature more quickly, thereby improving the heating quality and production efficiency of the electrode sheets.

[0015] In some embodiments, the hot press roller includes a fixed inner core and a rotating outer cylinder. The fixed inner core has a medium flow channel inside. The rotating outer cylinder is rotatably fitted around the fixed inner core. The inlet and outlet ends of the medium flow channel are located at the same end of the fixed inner core. The fixed inner core is fixedly connected to an external constant-temperature medium supply system, and the rotating outer cylinder contacts the electrode and rotates as the electrode moves. In this structure, the fixed inner core has a medium flow channel and is fixedly connected to the external constant-temperature medium supply system, allowing the constant-temperature medium to flow stably into and out of the medium flow channel. Because the fixed inner core is fixed in position, the structure of the medium flow channel is not affected by the rotation of the rotating outer cylinder, ensuring that the constant-temperature medium flows within the channel according to a preset path and flow rate, thereby achieving stable and efficient heat transfer. The constant-temperature medium can uniformly transfer heat to the fixed inner core, and then conduct the heat to the rotating outer cylinder through the contact between the fixed inner core and the rotating outer cylinder, thus providing uniform heating to the electrode in contact with the rotating outer cylinder, which helps improve the quality and performance consistency of the electrode. Because the inlet and outlet ends of the medium flow channel are located at the same end of the fixed inner core, the flow path length of the constant temperature medium inside the hot press roller is reduced, thus lowering the thermal resistance.

[0016] In some embodiments, the electrode manufacturing apparatus further includes a temperature detection unit disposed on the surface of the electrode away from the hot pressing roller, for real-time monitoring of the electrode surface temperature after hot pressing. In the above structure, real-time monitoring of the electrode surface temperature can promptly detect uneven temperature distribution. If the temperature distribution is uneven during hot pressing, differences in the physical and chemical properties of different parts of the electrode will occur, such as inconsistent thickness and uneven distribution of active materials, thereby affecting battery performance and safety. Through the temperature detection unit, operators can quickly detect areas of abnormal temperature and adjust parameters such as the temperature and pressure of the hot pressing roller or the electrode transfer speed in a timely manner to ensure uniform electrode surface temperature and improve the stability of electrode quality. Real-time temperature monitoring helps operators to promptly grasp the operating status of the hot pressing process, quickly adjust production parameters, and reduce production interruptions and defective products caused by temperature anomalies. Simultaneously, through the analysis and optimization of temperature data, the efficiency of the hot pressing process can be further improved, the production cycle shortened, production efficiency increased, and production costs reduced.

[0017] In some embodiments, the electrode manufacturing apparatus further includes a constant-temperature medium supply system, which includes a medium storage tank, a heating rod, a delivery pipe, and a collection pipe. The medium storage tank stores the constant-temperature medium. The heating rod is disposed within the medium storage tank and is used to heat the constant-temperature medium. The two ends of the delivery pipe are respectively connected to the medium storage tank and the inlet end of the medium flow channel. The two ends of the collection pipe are respectively connected to the medium storage tank and the outlet end of the medium flow channel. The constant-temperature medium circulates between the medium storage tank, the delivery pipe, the medium flow channel, and the collection pipe. In the above structure, the heating rod is disposed within the medium storage tank and can directly heat the stored constant-temperature medium. By precisely controlling the power and heating time of the heating rod, precise adjustment of the constant-temperature medium temperature can be achieved. Because the constant-temperature medium circulates between the medium storage tank, the delivery pipe, the medium flow channel, and the collection pipe, the medium heated by the heating rod can quickly mix with other media in the storage tank, and the heat is evenly transferred to the entire system through circulation. This makes the temperature distribution on the surface of the hot press roller more uniform, reduces the risk of uneven heating of the electrode due to excessively high or low local temperatures, and improves the consistency and pass rate of the electrode.

[0018] In some embodiments, the constant-temperature medium supply system further includes a temperature control unit, which is electrically connected to the heating rod and the temperature detection unit, respectively. The temperature control unit is configured to receive the electrode temperature signal collected by the temperature detection unit and adjust the heating power of the heating rod according to the difference between the electrode temperature and the preset target temperature to maintain the temperature of the constant-temperature medium within the preset range. In the above structure, the temperature control unit receives the electrode temperature signal collected by the temperature detection unit, compares it with the preset target temperature, and adjusts the heating power of the heating rod according to the difference, forming a complete closed-loop control system. This closed-loop control can respond to changes in electrode temperature in real time and accurately. Compared with open-loop control, it improves the accuracy of temperature control, ensuring that the temperature of the constant-temperature medium remains stable within the preset range, providing a stable and uniform heating environment for the electrode. During the electrode manufacturing process, production conditions may change at any time, such as fluctuations in electrode conveying speed and changes in ambient temperature. These factors will affect the hot-pressing temperature of the electrode. The temperature control unit can quickly sense these changes and adjust the heating power of the heating rod in a timely manner, so that the temperature of the constant-temperature medium can quickly recover to the preset value, achieving dynamic temperature balance and ensuring the stability and continuity of the production process. The temperature control unit can automatically adjust the heating power of the heating rod according to the electrode temperature signal, realizing automated temperature control. Operators do not need to frequently manually adjust the heating parameters; they only need to set the preset target temperature, reducing manual intervention, lowering labor intensity, and improving production efficiency.

[0019] Secondly, this application provides a battery cell prepared using the electrode manufacturing apparatus as described in the above embodiments.

[0020] Thirdly, this application provides a battery manufacturing apparatus, which includes the battery cell electrode manufacturing apparatus described in the above embodiments.

[0021] 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

[0022] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the structure of an electrode manufacturing apparatus provided in some embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the structure of the hot press roller provided in some embodiments of this application;

[0026] Figure 4 Schematic diagrams of the electrode manufacturing apparatus provided in other embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the structure of the hot press roller provided in some other embodiments of this application;

[0028] Figure 6 This is a left-side structural schematic diagram of a hot press roller provided in some other embodiments of this application;

[0029] Figure 7 This is a schematic diagram of the structure of the hot press roller provided in some other embodiments of this application;

[0030] Figure 8 This is a left-side structural schematic diagram of a hot press roller provided in some other embodiments of this application;

[0031] Figure 9 This is a schematic diagram of the structure of a hot press roller provided in some other embodiments of this application.

[0032] Figure 10 This is a schematic diagram of the electrode manufacturing apparatus according to Embodiment 1 of this application;

[0033] Figure 11 This is a schematic diagram of the electrode manufacturing apparatus according to Embodiment 2 of this application.

[0034] Detailed Explanation of Reference Numerals

[0035] 1. Battery cell; 101. Electrode assembly; 102. Housing; 103. End cap; 104. Shell; 105. Electrode terminal; 2. Electrode manufacturing device; 201. Drive roller; 202. Take-up roller; 203. Hot press roller; 204. Medium flow channel; 205. Sub-roller; 206. Tension roller; 207. Correction roller; 208. Liquid inlet flow channel; 209. Liquid outlet flow channel; 210. Connecting flow channel; 211. Fixed shaft; 212. Roller; 213. Fixed inner core; 214. Rotating outer cylinder; 215. Temperature detection unit; 3. Electrode. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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).

[0042] 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.

[0043] 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.

[0044] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0045] In this application, "multiple" means two or more (including two).

[0046] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a type of battery that can be used again after the battery cell has been discharged by recharging to activate the active materials.

[0047] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0048] like Figure 1As shown, a typical battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0049] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0050] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0051] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided one or more.

[0052] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0053] In related technologies, electrode assemblies are formed by winding and shaping a positive electrode sheet, a separator, and a negative electrode sheet. The electrode sheet can be either a positive or negative electrode sheet. For example, the manufacturing process of the positive electrode sheet includes coating an active material onto a current collector, cold pressing the active material, and drying. After these steps, and after winding the electrode sheet and separator, the electrode sheet undergoes significant deformation during operation. Research has found that this deformation is due to the application of significant stress to the active material during cold pressing. The stress within the active material is not fully released before winding and assembling into the housing, thus causing significant deformation of the electrode assembly within the housing.

[0054] To address the aforementioned issues, this application provides an electrode manufacturing apparatus. The rotating design of the drive roller and take-up roller, combined with the rotation of the hot press roller and the uninterrupted supply of a constant-temperature medium, forms a continuous production process. The electrode, guided by the drive roller, is heated by the hot press roller and then stably wound by the take-up roller. The entire process requires no frequent shutdowns for manual intervention or adjustment, enabling long-term continuous production, improving production efficiency, and reducing production costs. Specifically, the hot press roller heats and presses the electrode during transport, continuously and uniformly applying heat and pressure to the electrode surface during rotation. This effectively releases the internal stress of the electrode after cold pressing, allowing the electrode thickness to rebound and resulting in a smoother, flatter surface. Furthermore, the constant-temperature medium maintains a stable temperature for the hot press roller, ensuring more uniform rebound of the electrode and improving the overall thickness consistency. This reduces the thickness expansion and deformation of the electrode assembly during operation, improving the stability of the battery cell during operation.

[0055] Please refer to the reference. Figures 2 to 3 , Figure 2 This is a schematic diagram of the structure of an electrode manufacturing apparatus provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a hot press roller provided in some embodiments of this application.

[0056] As shown in the figure, the electrode manufacturing apparatus 2 provided in this application embodiment includes a drive roller 201, a take-up roller 202, and a hot press roller 203. The drive roller 201 is used to drive the electrode 3 to move. The take-up roller 202 is configured to be rotatable to wind the electrode 3. The hot press roller 203 is disposed on the electrode 3 transport path between the drive roller 201 and the take-up roller 202. The hot press roller 203 can rotate as the electrode 3 moves, and a medium flow channel 204 is provided inside the hot press roller 203. The constant temperature medium is used to supply the constant temperature medium flow to heat the hot press roller 203, so that the electrode 3 is heated when passing through the hot press roller 203.

[0057] The rotating design of the drive roller 201 and the take-up roller 202, combined with the rotation of the hot press roller 203 and the uninterrupted supply of the constant-temperature medium, forms a continuous production process. The electrode sheet 3 can be continuously released from the drive roller 201, heated by the hot press roller 203, and then stably wound by the take-up roller 202. The entire process requires no frequent machine stops for manual intervention or adjustment, enabling long-term continuous production, improving production efficiency, and reducing production costs. For example, the drive roller 201 is positioned after the cold pressing process, meaning the electrode sheet 3 on the drive roller 201 has already completed the cold pressing process.

[0058] The electrode sheet 3 typically consists of multiple layers, including a current collector and an active material layer. The hot press roller 203 heats the electrode sheet 3 to a suitable temperature, such as 30°C to 80°C, which effectively releases stress on the active material. Simultaneously, it enhances the connection stability between the active material layer and the current collector.

[0059] The constant-temperature medium supply system ensures a constant temperature for the hot-pressing roller 203, allowing the electrode 3 to undergo uniform heating as it passes through. This helps to achieve a more uniform distribution of active materials within the electrode 3, reducing performance differences between different parts and ensuring consistent performance of the electrode 3 produced in the same or even different batches. This improves the overall quality and stability of the battery product and reduces the risks associated with battery performance fluctuations.

[0060] In the technical solution of this application embodiment, the rotational design of the drive roller 201 and the take-up roller 202, combined with the rotation of the hot pressing roller 203 and the uninterrupted supply of the constant temperature medium, forms a continuous production process. The electrode sheet 3, guided by the drive roller 201, is heated by the hot pressing roller 203 and then stably wound by the take-up roller 202. The entire process requires no frequent machine stops for manual intervention or adjustment, enabling long-term continuous production, improving production efficiency, and reducing production costs. Specifically, the hot pressing roller 203 heats and applies pressure to the electrode sheet 3 during transport, continuously and uniformly applying heat and pressure to the surface of the electrode sheet 3 during rotation. This effectively releases the internal stress of the electrode sheet 3 after cold pressing, allowing the electrode sheet 3 to rebound in thickness and making its surface smoother. Furthermore, the constant temperature medium maintains a stable temperature for the hot pressing roller 203, resulting in more uniform rebound of the electrode sheet 3 and improving the overall thickness consistency of the electrode sheet 3. This reduces the amount of thickness expansion and deformation of the electrode assembly 101 during operation, thereby improving the stability of the battery cell 1 during operation.

[0061] like Figure 4 As shown, in some embodiments of this application, the number of hot pressing rollers 203 is at least one set, and each set of hot pressing rollers 203 includes two sub-rollers 205. The two sub-rollers 205 are arranged at intervals along the conveying path of the electrode 3 and are respectively disposed on opposite sides of the electrode 3. The two sub-rollers 205 are respectively located on opposite sides of the electrode 3 and are hot-pressed on the electrode 3 during the conveying process.

[0062] This arrangement allows the upper and lower surfaces of the electrode 3 to be subjected to uniform pressure and heat simultaneously, reducing the probability of problems such as deformation and uneven thickness that may occur with unilateral hot pressing. The two sub-rollers 205 simultaneously hot press the electrode 3, completing the heating and compaction process in a shorter time. Compared to unilateral, gradual heating and calendering, this simultaneous action shortens the hot pressing time, accelerates the production speed of the electrode 3, and meets the needs of large-scale production.

[0063] In some embodiments of this application, in each set of hot-pressing rollers 203, the length L of the electrode 3 between the two sub-rollers 205 is: 200mm ≤ L ≤ 3000mm. With this structure, the electrode 3 can dissipate heat sufficiently after passing the first sub-roller 205, and the electrode 3 on the first side can fully release stress and rebound. When passing the second sub-roller 205, the first side has completed stress release and rebound, and the second side begins to undergo hot pressing to release internal stress. Within this length range, the electrode 3 has sufficient time to receive heat transfer between the two sub-rollers 205. If the length L is less than 200mm, the residence time of the electrode 3 between the hot-pressing rollers 203 is too short, and the heat cannot be fully transferred to the interior of the electrode 3, resulting in uneven heating of the electrode 3, a large temperature difference between the surface and the interior, and affecting the performance and distribution of the active material in the electrode 3. When L is between 200mm and 3000mm, heat can be transferred relatively evenly from the hot press roller 203 to all parts of the electrode 3, so that the electrode 3 as a whole reaches a suitable hot pressing temperature and ensures the stability of the hot pressing effect.

[0064] In some embodiments of this application, the electrode manufacturing apparatus 2 further includes a tension roller 206 and a correction roller 207. The tension roller 206 is disposed on the electrode 3 transport path between two adjacent sets of hot-pressing rollers 203 to maintain the transport tension of the electrode 3. The correction roller 207 is disposed on the electrode 3 transport path and upstream of the tension roller 206 to correct electrode 3 deviation. The axes of both the tension roller 206 and the correction roller 207 are parallel to the axis of the hot-pressing roller 203. In the above structure, the tension roller 206 applies controllable tension to the electrode 3 through physical contact, and its parallel axis design ensures uniform tension distribution. The tandem arrangement of the correction roller 207 and the tension roller 206, with their parallel axes, ensures that the direction of the correction force is perpendicular to the generatrix of the hot-pressing roller 203, reducing the risk of electrode 3 displacement or twisting. Stable tension improves the uniformity of pressure between the hot-pressing roller 203 and the electrode 3, while the correction roller 207 reduces the risk of unilateral overheating of the electrode 3. The aforementioned structure improves the consistency of the springback thickness of electrode 3.

[0065] like Figure 3 As shown in some embodiments of this application, each hot press roller 203 has multiple media flow channels 204, which are evenly spaced along the circumference of the hot press roller 203. This structure, with multiple media flow channels 204 evenly distributed along the circumference of the hot press roller 203, enables the constant temperature medium to form a uniform heat exchange network inside the roller body. This improves the process consistency and product performance of the electrode 3, while reducing energy consumption and maintenance costs.

[0066] In some embodiments of this application, the medium flow channel 204 includes an inlet flow channel 208, an outlet flow channel 209, and a connecting flow channel 210. The inlet flow channel 208 extends axially along the hot press roller 203, and its inlet end is connected to the constant temperature medium supply system. The outlet flow channel 209 extends axially along the hot press roller 203, and its outlet end is connected to the constant temperature medium supply system. The two ends of the connecting flow channel 210 are respectively connected to the inlet flow channel 208 and the outlet flow channel 209 to form a continuous medium circulation path.

[0067] In the above structure, the thermostatic medium flows sequentially through the inlet channel 208, the connecting channel, and the outlet channel 209, continuously heating the hot press roller 203 at a constant temperature. The thermostatic medium can fully contact the inner wall of the hot press roller 203 in the axial direction, uniformly transferring heat to the hot press roller 203, thus ensuring the uniformity of the surface temperature of the hot press roller 203 in the axial direction. When the electrode 3 contacts the hot press roller 203, all parts of the electrode 3 are uniformly heated, avoiding localized overheating or undercooling due to uneven temperature, effectively improving the heating quality of the electrode 3. The continuous medium circulation path ensures the continuous flow of the thermostatic medium within the hot press roller 203, preventing stagnation or accumulation of the medium in localized areas. Through precise control of the inlet temperature and flow rate by the thermostatic medium supply system, the temperature of the hot press roller 203 can be stably maintained within the set range, reducing the impact of temperature fluctuations on the heating quality of the electrode 3. Stable temperature control helps improve the repeatability and consistency of the electrode 3 manufacturing process, reduces the scrap rate, and enhances the reliability of the device.

[0068] In some embodiments of this application, the inlet channel 208 has a circular cross-section with an inner diameter D1 of 5mm ≤ D1 ≤ 100mm. The outlet channel 209 has a circular cross-section with an inner diameter D2 of 5mm ≤ D2 ≤ 100mm. In the above structures, the circular cross-section has the smallest perimeter compared to rectangular or triangular channels for the same cross-sectional area. Friction between the fluid and the channel wall is one of the main causes of flow resistance when fluid flows within the channel. A smaller perimeter results in a smaller contact area between the fluid and the channel wall, thus reducing flow resistance. This allows the isothermal medium to flow more smoothly in the inlet channel 208 and outlet channel 209, reducing energy loss and improving the efficiency of medium circulation. The streamlined structure of the circular channel helps maintain laminar flow. When the fluid velocity is moderate and the inner diameter of the channel is within a certain range, the fluid in the circular channel is more likely to form a stable laminar flow, which is relatively stable and results in less energy loss.

[0069] In some embodiments of this application, the working outer diameter D of the hot press roller 203 is 10mm ≤ D ≤ 300mm. In the above structure, if the outer diameter is too small, the contact area between the hot press roller 203 and the electrode 3 is relatively small, and the heat transfer range is limited, which may lead to local overheating of the electrode 3 while other parts are underheated, affecting the consistency of the electrode 3's performance. Similarly, an excessively large outer diameter may increase heat loss during the heat transfer process due to a longer heat transfer path, thus affecting the heating uniformity. When the working outer diameter of the hot press roller 203 is within a suitable range, the uniform heating of the electrode 3 can be better guaranteed.

[0070] like Figure 5 as well as Figure 6 As shown, in some embodiments of this application, the hot press roller 203 includes a fixed shaft 211 and a roller 212. The fixed shaft 211 is used to mount to the frame. The roller 212 is sleeved on the fixed shaft 211, and a medium flow channel 204 is provided inside the roller 212. The inlet end and outlet end of the medium flow channel 204 are both arranged facing the same end of the roller 212.

[0071] In the above structure, the fixed shaft 211 is used to mount the hot press roller 203 onto the frame, which makes the installation operation relatively simple. When maintenance or replacement of the hot press roller 203 is required, since the roller 212 is sleeved on the fixed shaft 211, it can be easily removed from the fixed shaft 211. Moreover, the inlet and outlet ends of the medium flow channel 204 are both set facing the same end of the roller 212, which makes it easier to connect or disconnect the medium pipeline. The fact that the inlet and outlet ends of the medium flow channel 204 are set at the same end of the roller 212 can optimize the circulation path of the constant temperature medium. After the constant temperature medium enters the medium flow channel 204 from the inlet end, it can flow inside the roller 212 according to a relatively reasonable path, fully exchange heat with the inner wall of the roller 212, and thus more effectively transfer heat to the roller 212. Compared to designs where the inlet and outlet ends are located at different ends of the roller 212, this design reduces energy loss and flow resistance during the flow process, improves heat transfer efficiency, and enables the roller 212 to reach and maintain the required temperature more quickly, thereby improving the heating quality and production efficiency of the electrode 3.

[0072] like Figure 7 as well as Figure 8 As shown, in some embodiments of this application, the hot press roller 203 includes a fixed inner core 213 and a rotating outer cylinder 214. The fixed inner core 213 has a media flow channel 204 inside. The rotating outer cylinder 214 is rotatably sleeved on the fixed inner core 213. The inlet and outlet ends of the media flow channel 204 are both located at the same end of the fixed inner core 213. The fixed inner core 213 is fixedly connected to an external constant-temperature media supply system, and the rotating outer cylinder 214 contacts the electrode 3 and rotates as the electrode 3 moves.

[0073] In the above structure, a medium flow channel 204 is provided inside the fixed inner core 213 and is fixedly connected to the external constant temperature medium supply system, allowing the constant temperature medium to stably flow into and out of the medium flow channel 204. Because the fixed inner core 213 is in a fixed position, the structure of the medium flow channel 204 is not affected by the rotation of the rotating outer cylinder 214, ensuring that the constant temperature medium flows within the channel according to a preset path and flow rate, thereby achieving stable and efficient heat transfer. The constant temperature medium can uniformly transfer heat to the fixed inner core 213, and then conduct the heat to the rotating outer cylinder 214 through the contact between the fixed inner core 213 and the rotating outer cylinder 214, thus providing uniform heating to the electrode 3 in contact with the rotating outer cylinder 214, which helps improve the quality and performance consistency of the electrode 3. Because the inlet and outlet ends of the medium flow channel 204 are located at the same end of the fixed inner core 213, the flow path length of the constant temperature medium inside the hot press roller 203 is reduced, lowering the thermal resistance.

[0074] like Figure 9 As shown, in some embodiments of this application, the electrode manufacturing apparatus 2 further includes a temperature detection unit 215, which is disposed on the side of the electrode 3 away from the hot pressing roller 203, for real-time monitoring of the surface temperature of the electrode 3 after hot pressing.

[0075] In the above structure, real-time monitoring of the electrode surface temperature 3 allows for timely detection of uneven temperature distribution. Uneven temperature distribution during hot pressing will lead to differences in the physical and chemical properties of different parts of the electrode 3, such as inconsistent thickness and uneven distribution of active materials, thus affecting battery performance and safety. Through the temperature detection unit 215, operators can quickly detect areas of abnormal temperature and adjust parameters such as the temperature and pressure of the hot pressing roller 203 or the transfer speed of the electrode 3 in a timely manner to ensure uniform surface temperature of the electrode 3 and improve the stability of electrode quality. Real-time temperature monitoring helps operators to promptly grasp the operating status of the hot pressing process, quickly adjust production parameters, and reduce production interruptions and defective products caused by temperature anomalies. Furthermore, analysis and optimization of temperature data can further improve the efficiency of the hot pressing process, shorten the production cycle, increase production efficiency, and reduce production costs.

[0076] In some embodiments of this application, the constant-temperature medium supply system includes a medium storage tank, a heating rod, a delivery pipe, and a collection pipe. The medium storage tank stores the constant-temperature medium. The heating rod is disposed inside the medium storage tank and is used to heat the constant-temperature medium. The two ends of the delivery pipe are connected to the medium storage tank and the inlet end of the medium flow channel 204, respectively. The two ends of the collection pipe are connected to the medium storage tank and the outlet end of the medium flow channel 204, respectively. The constant-temperature medium circulates between the medium storage tank, the delivery pipe, the medium flow channel 204, and the collection pipe. In the above structure, the heating rod is disposed inside the medium storage tank and can directly heat the stored constant-temperature medium. By precisely controlling the power and heating time of the heating rod, precise adjustment of the constant-temperature medium temperature can be achieved. Because the constant-temperature medium circulates between the medium storage tank, the delivery pipe, the medium flow channel 204, and the collection pipe, the medium heated by the heating rod can quickly mix with other media in the storage tank, and the heat is evenly transferred to the entire system through circulation. This makes the temperature distribution on the surface of the hot press roller 203 more uniform, reduces the risk of uneven heating of the electrode 3 due to excessively high or low local temperatures, and improves the consistency and pass rate of the electrode 3.

[0077] In some embodiments of this application, the constant temperature medium supply system further includes a temperature control unit. The temperature control unit is electrically connected to the heating rod and the temperature detection unit 215, respectively. The temperature control unit is configured to receive the temperature signal of the electrode 3 collected by the temperature detection unit 215, and adjust the heating power of the heating rod according to the difference between the temperature of the electrode 3 and the preset target temperature, so as to maintain the temperature of the constant temperature medium within the preset range. In the above structure, the temperature control unit receives the temperature signal of the electrode 3 collected by the temperature detection unit 215, compares it with the preset target temperature, and adjusts the heating power of the heating rod according to the difference, forming a complete closed-loop control system. This closed-loop control can respond to changes in the temperature of the electrode 3 in real time and accurately. Compared with open-loop control, it improves the accuracy of temperature control, ensuring that the temperature of the constant temperature medium remains stable within the preset range, providing a stable and uniform heating environment for the electrode 3. During the manufacturing process of the electrode 3, production conditions may change at any time, such as fluctuations in the conveying speed of the electrode 3 and changes in ambient temperature. These factors will affect the hot pressing temperature of the electrode 3. The temperature control unit can quickly sense these changes and adjust the heating power of the heating rod in a timely manner, so that the temperature of the constant temperature medium can quickly return to the preset value, achieving dynamic temperature balance and ensuring the stability and continuity of the production process. The temperature control unit can automatically adjust the heating power of the heating rod according to the temperature signal of electrode 3, realizing the automation of temperature control. Operators do not need to frequently manually adjust the heating parameters; they only need to set the preset target temperature, reducing manual intervention, lowering labor intensity, and improving production efficiency.

[0078] In some optional embodiments, the electrode manufacturing apparatus 2 includes a drive roller 201, a take-up roller 202, and a hot press roller 203. The drive roller 201 drives the electrode 3 to move. The take-up roller 202 is configured to be rotatable to wind the electrode 3. The hot press roller 203 is disposed on the electrode 3 transport path between the drive roller 201 and the take-up roller 202, and the hot press roller 203 can rotate as the electrode 3 moves. The hot press roller 203 has a medium flow channel 204 inside. A constant temperature medium flows in the medium flow channel 204 to heat the hot press roller 203, so that the electrode 3 is heated when passing through the hot press roller 203. In each hot press roller 203, there are multiple medium flow channels 204, which are evenly spaced along the circumference of the hot press roller 203. The medium flow channel 204 includes an inlet flow channel 208, an outlet flow channel 209, and a connecting flow channel 210. The inlet channel 208 extends axially along the hot press roller 203, and its inlet end is connected to the constant temperature medium supply system. The outlet channel 209 extends axially along the hot press roller 203, and its outlet end is connected to the constant temperature medium supply system. The two ends of the connecting channel 210 are respectively connected to the inlet channel 208 and the outlet channel 209 to form a continuous medium circulation path. The hot press roller 203 includes a fixed inner core 213 and a rotating outer cylinder 214. The fixed inner core 213 has a medium channel 204 inside. The rotating outer cylinder 214 is rotatably sleeved on the fixed inner core 213. The inlet end and outlet end of the medium channel 204 are both located at the same end of the fixed inner core 213. The fixed inner core 213 is fixedly connected to the external constant temperature medium supply system, and the rotating outer cylinder 214 contacts the electrode 3 and rotates as the electrode 3 moves. The hot-pressing rollers 203 are arranged in multiple sets, each set including two sub-rollers 205. The two sub-rollers 205 are arranged at intervals along the conveying path of the electrode 3 and are respectively located on opposite sides of the electrode 3. The two sub-rollers 205 are located on opposite sides of the electrode 3 and hot-press it during the conveying process. The electrode manufacturing apparatus 2 also includes a temperature detection unit 215, which is located on the surface of the electrode 3 away from the hot-pressing rollers 203, for real-time monitoring of the surface temperature of the electrode 3 after hot pressing. The electrode manufacturing apparatus 2 also includes a tensioning roller 206 and a correction roller 207. The tensioning roller 206 is located on the electrode 3 conveying path between two adjacent sets of hot-pressing rollers 203 to maintain the conveying tension of the electrode 3. The correction roller 207 is located on the electrode 3 conveying path and upstream of the tensioning roller 206 to correct the deviation of the electrode 3. The axes of tension roller 206 and straightening roller 207 are both set parallel to the axis of hot pressing roller 203.

[0079] Example 1

[0080] like Figure 10As shown, the heat exchange channel diameter of the hot press roller 203 in the electrode manufacturing apparatus 2 is 10mm, and the outer diameter of the hot press roller 203 is 50mm. The main material of the hot press roller 203 is copper, and the distance between the electrode 3 between the two sub-rollers 205 in a set of hot press rollers 203 is 200mm. Three sets of hot press rollers 203 are arranged sequentially, and each hot press roller 203 uses heat transfer oil as the constant temperature medium. The temperature of the constant temperature medium is set at 50 degrees Celsius. One correction roller 207 and one tensioning roller 206 are arranged between two adjacent sets of hot press rollers 203 to ensure accurate and tight belt feeding of the electrode 3. In this embodiment, a roller with a smaller outer diameter is selected for the hot press roller, and the contact distance and time with the electrode 3 are slightly shorter. Three sets of hot press rollers 203 are needed to heat the electrode 3 to ensure that the electrode 3 has sufficient temperature to release stress and rebound.

[0081] Example 2

[0082] like Figure 11 As shown, the medium flow channel 204 of the hot press roller 203 has a diameter of 40mm, the outer diameter of the hot press roller 203 is 200mm, the main material of the roller is copper, and the distance between the electrode 3 between the two sub-rollers 205 is 600mm. There are two sets of hot rollers in total, and the temperature of the constant temperature medium is set at 70 degrees Celsius. Because the outer diameter of the hot press roller 203 is relatively large compared to the hot press roller 203 using this heating method and the combination form, the problem of insufficient rebound of the electrode 3 after cold pressing is improved, and the risks of abnormal deformation and poor wetting caused by abnormal rebound of the electrode 3 into the shell are reduced.

[0083] This application provides a battery cell 1, manufactured using the electrode manufacturing apparatus 2 described in the above embodiments. The hot press roller 203, with its built-in medium flow channel 204, works in conjunction with a constant-temperature medium supply system. The surface temperature of the hot press roller 203 is precisely controlled by a circulating constant-temperature medium (such as heat-conducting oil or water), ensuring uniform heating of the electrode 3 during transport. This design avoids the localized overheating or temperature fluctuations that can occur with traditional heating methods (such as electric heating tubes), keeping the surface temperature deviation of the electrode 3 within ±2°C. This fully releases the internal stress of the electrode 3 after cold pressing, allowing for uniform rebound and reducing expansion and deformation of the electrode assembly 101 during operation. It also improves the uniformity and adhesion of the active material coating. The constant-temperature hot pressing process effectively suppresses localized overheating and decomposition of the binder in the electrode 3, reducing the generation of burrs and dust on the electrode 3 surface, thereby reducing the risk of internal short circuits in the battery. Furthermore, the uniform temperature distribution avoids separator shrinkage or melting caused by localized overheating, further enhancing battery safety. Therefore, the above-mentioned technical solution improves the stability of battery cell 1 during operation.

[0084] This application provides a battery manufacturing apparatus, which includes the battery cell 1 electrode manufacturing device 2 described in the above embodiments. In the aforementioned battery manufacturing apparatus, the rotational design of the drive roller 201 and the take-up roller 202, combined with the rotation of the hot press roller 203 and the uninterrupted supply of a constant-temperature medium, forms a continuous production process. The electrode 3 can be continuously released from the drive roller 201, heated by the hot press roller 203, and then stably wound by the take-up roller 202. The entire process does not require frequent machine stops for manual intervention or adjustment, enabling long-term continuous production, improving production efficiency, and reducing production costs. Specifically, the hot press roller 203 heats and applies pressure to the electrode 3 during transport, continuously and uniformly applying heat and pressure to the surface of the electrode 3 during rotation. This effectively releases the internal stress of the electrode 3 after cold pressing, allowing the electrode 3 to rebound in thickness and making the surface of the electrode 3 smoother. Furthermore, the constant-temperature medium maintains a stable temperature for the hot press roller 203, resulting in more uniform rebound of the electrode 3 and improving the overall thickness consistency of the electrode 3. This reduces the amount of thickness expansion and deformation of the electrode assembly 101 during operation, thereby improving the stability of the battery cell 1 during operation.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode manufacturing apparatus, characterized in that, include: Drive rollers are used to drive the electrode sheets to move; A take-up roller, configured to be rotatable, for winding the electrode sheet; A hot press roller is disposed on the electrode conveying path between the drive roller and the take-up roller. The hot press roller can rotate as the electrode moves. A medium flow channel is provided inside the hot press roller. The medium flow channel supplies a constant-temperature medium to heat the hot press roller, so that the electrode is heated when it passes through the hot press roller.

2. The electrode manufacturing apparatus according to claim 1, characterized in that, The number of hot press rollers is at least one set, and each set of hot press rollers includes two sub-rollers. The two sub-rollers are arranged at intervals along the conveying path of the electrode sheet and are respectively located on opposite sides of the electrode sheet.

3. The electrode manufacturing apparatus according to claim 2, characterized in that, In each set of hot press rollers, the length L of the electrode between two sub-rollers is: 200mm≤L≤3000mm.

4. The electrode manufacturing apparatus according to claim 3, characterized in that, Also includes: Tensioning rollers are set on the electrode conveying path between two adjacent sets of hot pressing rollers to maintain the electrode conveying tension; The alignment roller, located on the electrode transport path and upstream of the tension roller, is used to correct electrode misalignment. The axes of the tensioning roller and the straightening roller are both parallel to the axis of the hot pressing roller.

5. The electrode manufacturing apparatus according to claim 1, characterized in that, In the hot press roller, there are multiple media channels, and the multiple media channels are evenly spaced along the circumference of the hot press roller.

6. The electrode manufacturing apparatus according to claim 1, characterized in that, The medium flow channel includes: The liquid inlet channel extends along the axial direction of the hot press roller, and its inlet end is connected to the constant temperature medium supply system. The liquid outlet channel extends along the axial direction of the hot press roller, and its outlet end is connected to the constant temperature medium supply system. The connecting channel is connected at both ends to the inlet channel and the outlet channel respectively to form a continuous medium circulation path.

7. The electrode manufacturing apparatus according to claim 6, characterized in that, The cross-section of the liquid inlet channel is circular, and its inner diameter D1 is: 5mm≤D1≤100mm; The cross-section of the liquid outlet channel is circular, and its inner diameter D2 is: 5mm≤D2≤100mm.

8. The electrode manufacturing apparatus according to claim 6, characterized in that, The working outer diameter D of the hot press roller is: 10mm≤D≤300mm.

9. The electrode manufacturing apparatus according to any one of claims 1-8, characterized in that, The hot press roller includes: Fixed shaft, used for mounting to the frame; A roller is sleeved on the fixed shaft, and the roller has a medium flow channel inside it. The inlet end and outlet end of the medium flow channel are both set towards the same end of the roller.

10. The electrode manufacturing apparatus according to any one of claims 1-8, characterized in that, The hot press roller includes: A fixed inner core is provided with the aforementioned medium flow channel inside; The outer cylinder is rotatably fitted around the fixed inner core; The inlet and outlet ends of the medium flow channel are both located at the same end of the fixed inner core. The fixed inner core is fixedly connected to the external constant temperature medium supply system. The rotating outer cylinder contacts the electrode and rotates as the electrode moves.

11. The electrode manufacturing apparatus according to any one of claims 1-8, characterized in that, The electrode manufacturing apparatus further includes a temperature detection unit, which is disposed on the side of the electrode away from the hot pressing roller, for real-time monitoring of the electrode surface temperature after hot pressing.

12. The electrode manufacturing apparatus according to claim 11, characterized in that, It also includes a constant temperature medium supply system, which comprises: Medium storage tank, used to store constant-temperature media; A heating rod is installed inside the medium storage tank for heating the constant-temperature medium; The infusion tube is connected at both ends to the medium storage tank and the inlet end of the medium flow channel, respectively. The liquid collection pipe is connected at both ends to the medium storage tank and the outlet end of the medium flow channel, respectively. The constant-temperature medium circulates between the medium storage tank, the delivery pipe, the medium flow channel, and the collection pipe.

13. The electrode manufacturing apparatus according to claim 12, characterized in that, The constant temperature medium supply system further includes a temperature control unit, which is electrically connected to the heating rod and the temperature detection unit respectively. The temperature control unit is configured to receive the electrode temperature signal collected by the temperature detection unit and adjust the heating power of the heating rod according to the difference between the electrode temperature and the preset target temperature, so as to maintain the temperature of the constant temperature medium within the preset range.

14. A single battery cell, characterized in that, Includes an electrode sheet, which is prepared using the electrode manufacturing apparatus as described in any one of claims 1-13.

15. A battery manufacturing apparatus, characterized in that, The battery manufacturing equipment includes an electrode manufacturing apparatus as described in any one of claims 1-13.

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