An electromagnetic induction heating drying apparatus and method for coating battery electrodes

Abstract

This invention provides an electromagnetic induction heating and drying device and method for battery electrode coating, belonging to the technical field of battery electrode coating production equipment. The device includes: a lower fixture fixing plate; a lower sensor assembly fixed on the lower fixture fixing plate; an upper sensor assembly opposite to the lower sensor assembly, forming an electrode conveying channel; an upper fixture fixing plate fixedly connected to the upper sensor assembly; a lifting mechanism installed between the lower and upper fixture fixing plates for driving the upper sensor assembly to move vertically; and also includes a position detection sensor, an infrared thermometer, and a high-frequency heating power supply. This invention uses electromagnetic induction to cause eddy current heating of the electrode itself, achieving low-energy consumption, high efficiency, and high adhesion drying from the inside out, while also offering advantages such as convenient operation and precise temperature control.

Description

Technical Field

[0001] This invention relates to the field of battery electrode coating production equipment technology, and more specifically, to an electromagnetic induction heating and drying device and method for battery electrode coating. Background Technology

[0002] Battery electrode coating and drying is a core process in the production of electrochemical energy storage devices such as lithium-ion batteries. After coating, the electrodes need to be dried to solidify and bond the coating slurry to the surface of the metal current collector. The uniformity, density, and drying efficiency of the slurry solidification directly determine the electrochemical performance of the battery electrodes and the production cycle. In existing technologies, the mainstream drying process for battery electrode coating is the hot air tunnel furnace drying process. This process uses densely arranged ventilation openings in the tunnel furnace to blow dry hot air onto the electrode surface to evaporate the slurry solvent, and it is currently the most widely used drying method in the industry.

[0003] However, the aforementioned hot air drying process has many technical defects and is no longer suitable for the high-capacity, low-energy-consumption, and high-performance development needs of the power battery industry: First, the heat from the hot air is easily dissipated within the furnace, resulting in extremely low energy utilization and high energy consumption during production, which increases battery manufacturing costs; Second, hot air drying relies on heat conduction from the electrode surface to the interior, limiting drying efficiency. To match the electrode conveyor speed of the production line, the length of the hot air tunnel furnace needs to be significantly increased, which not only occupies a large amount of production plant space but also increases equipment investment and maintenance costs; Third, hot air only acts on the surface of the slurry, which easily leads to a non-uniform drying phenomenon where the surface of the slurry dries first and the interior dries later. When the internal solvent evaporates, it easily forms capillary pores in the slurry layer, reducing the adhesion strength between the slurry and the metal current collector, and also affecting the structural density of the slurry layer, ultimately leading to a decrease in key indicators such as the cycle life and rate performance of the battery electrode.

[0004] Therefore, developing a battery electrode coating and drying device with low energy consumption, high drying efficiency, and the ability to achieve uniform curing of slurry to improve electrode adhesion performance has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide an electromagnetic induction heating and drying apparatus and method for coating battery electrodes, which aims to solve the problems mentioned in the background art.

[0006] This invention is implemented as follows: an electromagnetic induction heating and drying device for coating battery electrodes, comprising:

[0007] Lower tooling fixing plate;

[0008] The lower sensor assembly is fixed to the lower tooling mounting plate; the lower sensor assembly includes a lower sensor, a lower ferrite core, and a lower sensor encapsulation plate;

[0009] An upper sensor assembly is disposed opposite to the lower sensor assembly to form an electrode conveying channel; the upper sensor assembly includes an upper sensor, an upper ferrite core, and an upper sensor encapsulation plate.

[0010] The upper tooling fixing plate is fixedly connected to the upper sensor assembly;

[0011] A lifting mechanism is installed between the lower tooling fixing plate and the upper tooling fixing plate, and is used to drive the upper sensor assembly to move up and down in the vertical direction; the lifting mechanism includes a cylinder, a linear bearing, a guide shaft and a guide shaft fixing support;

[0012] A position detection sensor is installed at both ends of the lifting stroke of the lifting mechanism to detect the lifting position of the upper sensor assembly and provide feedback signals.

[0013] Infrared thermometers are used to monitor the temperature of coated electrodes in real time.

[0014] A high-frequency heating power supply is electrically connected to the upper and lower sensor components, and adjusts the output power according to the feedback from the infrared thermometer through a PID algorithm to control the temperature of the coated electrode to stabilize.

[0015] Optionally, the lower sensor and the lower ferrite core are cured in the lower sensor encapsulation plate with epoxy resin, and the lower sensor assembly is fixed to the lower tooling fixing plate by two lower sensor connecting plates.

[0016] Optionally, the upper sensor and the upper ferrite core are cured in the upper sensor encapsulation plate with epoxy resin, and the upper sensor assembly is fixedly connected to the upper tooling fixing plate through two upper sensor fixing plates.

[0017] Optionally, the upper sensor and the lower sensor are connected in series. After being connected to high-frequency alternating current, the current directions of the two sensors are the same and the magnetic fields are in the same direction. The magnetic field generates eddy currents on the coated electrode.

[0018] Optionally, four guide shaft fixing supports are provided and installed on the lower tooling fixing plate, four guide shafts are provided and pass through the guide shaft fixing supports, four linear bearings are provided and slide in cooperation with the guide shafts and are fixed on the upper tooling fixing plate, and two cylinders are provided and drive the upper tooling fixing plate to move up and down along the guide shafts.

[0019] Optionally, the position detection sensor is a photoelectric sensor, with the upper end of the lifting stroke corresponding to the belt threading / cleaning position and the lower end of the lifting stroke corresponding to the heating position.

[0020] Optionally, the infrared thermometer has two channels, which are respectively aimed at the upper and lower surfaces of the coated electrode to monitor the temperature of the coated electrode in real time.

[0021] Another object of the present invention is to provide an electromagnetic induction heating and drying method for battery electrode coating, which uses the aforementioned electromagnetic induction heating and drying apparatus for battery electrode coating, and includes the following steps:

[0022] Step 1: Control the lifting mechanism to drive the upper sensor assembly to the threading position, and pass the coated electrode sheet between the upper sensor assembly and the lower sensor assembly;

[0023] Step 2: Control the lifting mechanism to drive the upper sensor assembly to move down to the heating set position, connect the upper sensor and the lower sensor in series and then connect them to high-frequency AC power to make them generate magnetic fields in the same direction, thereby causing the coated electrode to generate eddy currents and heat up quickly and evenly.

[0024] Step 3: The surface temperature of the coated electrode is monitored in real time at multiple points using two infrared thermometers. The high-frequency heating power supply adjusts the output parameters of the high-frequency AC power supply based on the temperature measurement feedback using a PID algorithm to stabilize the temperature of the coated electrode at the set value.

[0025] Step 4: The coated electrode heats up to evaporate the solvent in the slurry from the inside out, completing the slurry curing and drying; when it is necessary to thread or clean, the lifting mechanism is controlled to drive the upper sensor assembly to move to the set position to complete the corresponding operation.

[0026] The present invention provides an electromagnetic induction heating and drying device and method for coating battery electrodes, which has the following beneficial effects:

[0027] This invention utilizes electromagnetic induction heating to generate eddy currents within the battery electrode sheets, achieving efficient drying of the slurry from the inside out and significantly reducing energy consumption. It features rapid heating, supporting conveyor belt speeds up to 120 meters per minute, and drastically shortens the length of drying equipment for the same production capacity, saving production space. The slurry dries more evenly and densely, improving adhesion to the electrode sheets by 30%, effectively enhancing the performance of the battery electrode products. Simultaneously, through the coordinated operation of a lifting mechanism, position detection sensors, and infrared temperature measurement and PID temperature control, it achieves convenient threading and cleaning operations, precise lifting and positioning, and stable and reliable temperature control.

[0028] In summary, this invention uses electromagnetic induction to generate eddy currents in the electrode itself, achieving low-energy consumption, high efficiency, and high adhesion for drying from the inside out, while also offering the advantages of convenient operation and precise temperature control.

[0029] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0031] Figure 1 An exploded view of an electromagnetic induction heating and drying apparatus for coating battery electrodes provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the overall assembly of the electromagnetic induction heating and drying device for coating battery electrodes provided in an embodiment of the present invention.

[0033] Figure 3 This is a top view of the overall assembly structure of the electromagnetic induction heating and drying device for coating battery electrodes provided in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the overall assembly of the electromagnetic induction heating and drying device for coating battery electrodes provided in an embodiment of the present invention (mainly showing the induction device).

[0035] In the diagram: 1-Lower tooling fixing plate; 2-Lower sensor connecting plate; 3-Lower ferrite core; 4-Lower sensor; 5-Lower sensor encapsulation plate; 6-Upper sensor encapsulation plate; 7-Upper sensor; 8-Upper ferrite core; 9-Upper sensor fixing plate; 10-Upper tooling fixing plate; 11-Lifting mechanism; 12-Linear bearing; 13-Guide shaft; 14-Guide shaft fixing support; 15-Cylinder. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the 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 used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] The following is a detailed description, with reference to the accompanying drawings, of an electromagnetic induction heating and drying apparatus and method for coating battery electrodes according to an embodiment of the present invention.

[0039] like Figure 1-4As shown, an electromagnetic induction heating and drying apparatus for coating battery electrodes is provided in one embodiment of the present invention, comprising:

[0040] Lower tooling fixing plate 1;

[0041] Two lower sensor connecting plates 2 are fixed to the lower tooling fixing plate 1;

[0042] The lower sensor assembly includes a lower sensor 4, a lower ferrite core 3, and a lower sensor encapsulation plate 5. The lower sensor 4 and the lower ferrite core 3 are cured in the lower sensor encapsulation plate 5 with epoxy resin, and the lower sensor assembly is fixed to the lower tooling fixing plate 1 by two lower sensor connecting plates 2.

[0043] The upper sensor assembly includes an upper sensor 7, an upper ferrite core 8, and an upper sensor encapsulation plate 6, wherein the upper sensor 7 and the upper ferrite core 8 are cured in the upper sensor encapsulation plate 6 with epoxy resin.

[0044] Two upper sensor mounting plates 9 are fixedly connected to the upper sensor assembly;

[0045] The upper tooling fixing plate 10 is fixedly connected to the two upper sensor fixing plates 9;

[0046] The lifting mechanism 11 includes a cylinder 15, a linear bearing 12, a guide shaft 13, and a guide shaft fixing support 14. There are four guide shaft fixing supports 14, which are installed on the lower tooling fixing plate 1. There are four guide shafts 13, which pass through the guide shaft fixing supports 14. There are four linear bearings 12, which slide and cooperate with the guide shafts 13 and are fixed on the upper tooling fixing plate 10. There are two cylinders 15, which drive the upper tooling fixing plate 10 to move up and down along the guide shafts 13.

[0047] Position detection sensors (photoelectric sensors) are respectively installed at both ends of the lifting stroke of the lifting mechanism 11 (the upper end of the lifting stroke corresponds to the threading / cleaning position, where threading refers to the process of passing the electrode through the device; the lower end of the lifting stroke corresponds to the heating position), that is, at the upper and lower limits of the lifting stroke, to detect the lifting position of the upper sensor assembly and to feed back the signal to the control system.

[0048] The infrared thermometer has two channels for real-time monitoring of the temperature of the coated electrode. The high-frequency heating power supply adjusts its output power based on temperature feedback using a PID algorithm to stabilize the temperature of the coated electrode. Specifically, the infrared thermometer is aimed at the upper and lower surfaces of the coated electrode to monitor its temperature in real time. The high-frequency heating power supply is electrically connected to the upper sensor 7 and the lower sensor 4. The high-frequency heating power supply has a built-in PID temperature control module that adjusts the output high-frequency AC parameters based on the feedback signal from the infrared thermometer to stabilize the temperature of the coated electrode at the set value (adjusted according to the slurry drying status).

[0049] After the equipment is started, the lifting mechanism 11 drives the upper sensor assembly to rise to the threading / cleaning position, and the electrode sheet is fed into the conveying channel between the upper and lower sensor assemblies by the production line conveying mechanism. After the threading is completed, the control system commands the cylinder to drive the upper sensor assembly to descend to the heating position according to the preset parameters. After the position detection sensor confirms that it is in place, the high-frequency heating power supply starts and outputs high-frequency AC power to the upper and lower sensor assemblies. The electrode sheet is simultaneously heated in a non-contact manner on both sides through electromagnetic induction. Two infrared thermometers collect the temperature data of the upper and lower surfaces of the electrode sheet in real time and feed it back to the PID temperature control module of the high-frequency heating power supply. The module dynamically adjusts the output power, frequency and other parameters of the high-frequency AC power supply according to the temperature measurement data to stabilize the electrode sheet temperature at the process set value. After drying is completed, the lifting mechanism 11 drives the upper sensor assembly to rise, and the electrode sheet is sent to the next process by the conveying mechanism to complete one drying cycle.

[0050] In one embodiment, the upper sensor 7 and the lower sensor 4 are connected in series, and after being connected to high-frequency alternating current, the current direction of the two is the same and the magnetic field is in the same direction. The magnetic field generates eddy currents on the coated electrode between the upper sensor assembly and the lower sensor assembly.

[0051] The lifting mechanism 11 drives the upper sensor assembly to move down to the set heating position and up to the set threading / cleaning position.

[0052] In a preferred embodiment, the upper ferrite core 8 and the lower ferrite core 3 are made of manganese-zinc ferrite with high magnetic permeability and adopt an integral closed magnetic circuit structure that matches the heating area of ​​the electrode, which effectively reduces magnetic leakage and avoids electromagnetic interference from magnetic leakage to surrounding production line equipment.

[0053] The upper sensor 7 and the lower sensor 4 are plate-shaped induction coils made of copper. The number of turns, wire diameter and arrangement of the coils are customized according to the heating power of the electrode and the drying process. The surface of the coil is silver-plated to reduce the conductive contact resistance and improve the induction heating efficiency.

[0054] This device utilizes high-frequency alternating current to generate an alternating magnetic field through an induction coil. When the electrode of a metal substrate (such as aluminum or copper foil) passes through this magnetic field, eddy currents are induced within it. These eddy currents generate Joule heating under the resistance of the electrode, thus achieving heating from the inside out. Compared with hot air conduction heating, electromagnetic induction heating has advantages such as high thermal efficiency, fast response, and small temperature gradient. In this invention, by connecting the upper and lower inductors in series and aligning their magnetic fields, the magnetic fields are superimposed, enhancing the magnetic flux density in the electrode, thereby improving the eddy current intensity and heating uniformity.

[0055] To further enhance the safety and reliability of the equipment, the high-frequency heating power supply is equipped with overcurrent and overtemperature protection modules, which automatically cut off the output when abnormal current or excessive temperature is detected. The sensor packaging board uses high-temperature resistant insulating materials to ensure that no leakage or breakdown occurs in high-temperature environments.

[0056] After prolonged use, volatile substances from the slurry or dust may accumulate on the sensor surface, affecting heating efficiency and temperature measurement accuracy. This device can lift the upper sensor assembly to a cleaning position via the lifting mechanism 11, where it can be wiped clean using anhydrous ethanol or a special cleaning agent and a lint-free cloth. The lower sensor assembly can also be maintained by disassembling the lower sensor connection plate. The sensor encapsulation plate uses an anti-stick coating to reduce contaminant adhesion.

[0057] To further enhance equipment stability and safety, a cooling channel can be installed inside the sensor packaging board, through which circulating cooling water is introduced to prevent the sensor from overheating due to prolonged operation. The cooling system is linked to the high-frequency heating power supply and automatically activates when the temperature exceeds a set threshold.

[0058] like Figure 1-4 As shown, in one embodiment, an electromagnetic induction heating and drying method for battery electrode coating is also provided, employing the aforementioned electromagnetic induction heating and drying apparatus for battery electrode coating, comprising the following steps:

[0059] Step 1: Control the lifting mechanism 11 to drive the upper sensor assembly upward to the threading setting position, and pass the coated electrode sheet through the upper and lower sensor assemblies of the multiple sets of electromagnetic induction heating devices. Specifically, the control system issues a command, and the cylinder 15 drives the upper tooling fixing plate 10 to move upward along the guide shaft 13 until the position detection sensor detects that the upper sensor assembly has reached the threading setting position, and stops moving; the coated electrode sheet is continuously passed through the multiple sets of upper and lower sensor assemblies of this device to complete the electrode threading operation.

[0060] Step 2: Control the lifting mechanism 11 to drive the upper sensor assembly to move down to the heating set position. Connect the upper sensor 7 and the lower sensor 4 in series and then connect them to a high-frequency AC power source. The two sensors generate a magnetic field in the same direction, causing eddy currents to form on the coated electrode sheet and resulting in rapid and uniform heating. Specifically, the cylinder 15 drives the upper tooling fixing plate 10 to move down along the guide shaft 13 until the position detection sensor detects that the upper sensor assembly has reached the heating set position and stops moving. Connect the upper sensor 7 and the lower sensor 4 in series and then connect them to the output terminal of the high-frequency heating power source. The high-frequency heating power source outputs high-frequency AC power, and the upper sensor 7 and the lower sensor 4 generate a magnetic field in the same direction. The magnetic field causes eddy currents to form inside the electrode sheet, thereby generating rapid and uniform heating.

[0061] Step 3: The surface temperature of the coated electrode is monitored in real time at multiple points using two infrared thermometers. The high-frequency heating power supply, based on a PID temperature control algorithm, adjusts the high-frequency AC output according to temperature feedback to stabilize the coated electrode temperature within the set value. Specifically, the two infrared thermometers collect the electrode temperature data in real time and transmit it to the control system. The high-frequency heating power supply, through a PID temperature control algorithm, adjusts the power or frequency of the high-frequency AC power in real time according to temperature feedback to stabilize the electrode temperature within the set drying temperature range.

[0062] Step 4: The coating electrode heats up, causing the solvent in the slurry to evaporate from the inside out, completing the slurry curing and drying. When re-threading or cleaning is required, the lifting mechanism 11 drives the upper sensor assembly to move upward to the set position to complete the corresponding operation. Specifically, the electrode heats up, causing the solvent in the slurry to evaporate from the inside out, and the slurry gradually solidifies and adheres tightly to the electrode. When re-threading the electrode or cleaning the sensor assembly is required, the cylinder 15 drives the upper sensor assembly to move upward to the threading / cleaning set position.

[0063] It should be noted that multiple sets of this device can be connected in parallel on the electrode conveying path, so that the electrodes pass through multiple sets of electromagnetic induction heating devices in sequence, thereby achieving continuous drying and further improving drying efficiency.

[0064] The above embodiments of the present invention provide an electromagnetic induction heating and drying device and method for coating battery electrodes. A lower tooling fixing plate 1 supports the overall lower structure; two lower sensor connecting plates 2 are fixed to the lower tooling fixing plate 1 for mounting the lower sensor assembly; the lower sensor assembly includes a lower sensor 4, a lower ferrite core 3, and a lower sensor encapsulation plate 5, wherein the lower sensor 4 and the lower ferrite core 3 are cured in the lower sensor encapsulation plate 5 with epoxy resin and fixed to the lower tooling fixing plate 1 by the lower sensor connecting plates 2; the upper sensor assembly includes an upper sensor 7, an upper ferrite core 8, and an upper sensor encapsulation plate 6, wherein the upper sensor 7 and the upper ferrite core 8 are cured in the upper sensor encapsulation plate 6 with epoxy resin; two upper sensor fixing plates 9 connect the upper sensor assembly to the upper tooling fixing plate 10; the lifting mechanism includes a cylinder 15 and a linear bearing. 12. Guide shaft 13 and guide shaft fixing support 14. Four guide shaft fixing supports 14 are installed on the lower tooling side. Four guide shafts 13 pass through the guide shaft fixing supports 14. Four linear bearings 12 slide with the guide shafts 13 and are fixed to the upper tooling fixing plate 10. Two cylinders 15 drive the upper tooling fixing plate 10 to move up and down along the guide shafts 13, thereby driving the upper sensor assembly to rise and fall. Position detection sensors are set at both ends of the lifting stroke to detect the position of the upper sensor assembly. Two infrared thermometers monitor the electrode temperature in real time. The high-frequency heating power supply adjusts the output power according to the temperature measurement signal through a PID algorithm. The upper sensor 7 and the lower sensor 4 are connected in series to a high-frequency alternating current with the current direction in the same direction, so that the magnetic fields generated by the two are in the same direction, inducing eddy currents in the electrode, realizing rapid and uniform heating of the electrode itself, and drying the slurry from the inside out, thus completing efficient drying.

[0065] Overall, this invention uses electromagnetic induction heating to generate eddy currents in the battery electrode sheets, achieving efficient drying of the slurry from the inside out. This significantly reduces energy consumption, improves drying efficiency (supports a conveyor belt speed of 120 meters per minute), greatly shortens equipment length, and saves space. At the same time, the slurry dries more evenly and densely, increasing adhesion to the electrode sheets by 30%, effectively improving the performance of the battery electrode sheets. Furthermore, through the lifting mechanism 11, position detection sensor, and infrared temperature measurement combined with PID temperature control, convenient threading, cleaning, and precise and stable temperature control are achieved.

[0066] The control, model, and circuit connection of each component are not specifically limited, and can be flexibly configured in practical applications. All circuits, electronic components, and modules involved are existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. Furthermore, the scope of protection of this invention does not involve improvements to the software and methods.

[0067] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electromagnetic induction heating and drying device for coating battery electrodes, characterized in that, include: Lower tooling fixing plate (1); The lower sensor assembly is fixed on the lower tooling fixing plate (1); the lower sensor assembly includes a lower sensor (4), a lower ferrite core (3) and a lower sensor encapsulation plate (5). The upper sensor assembly is arranged opposite to the lower sensor assembly to form an electrode conveying channel; the upper sensor assembly includes an upper sensor (7), an upper ferrite core (8) and an upper sensor encapsulation plate (6). The upper tooling fixing plate (10) is fixedly connected to the upper sensor assembly; The lifting mechanism (11) is installed between the lower tooling fixing plate (1) and the upper tooling fixing plate (10) and is used to drive the upper sensor assembly to move up and down in the vertical direction; the lifting mechanism (11) includes a cylinder (15), a linear bearing (12), a guide shaft (13) and a guide shaft fixing support (14). A position detection sensor is provided at both ends of the lifting stroke of the lifting mechanism (11) to detect the lifting position of the upper sensor assembly and provide feedback signal; Infrared thermometers are used to monitor the temperature of coated electrodes in real time. A high-frequency heating power supply is electrically connected to the upper and lower sensor components, and adjusts the output power according to the feedback from the infrared thermometer through a PID algorithm to control the temperature of the coated electrode to stabilize.

2. The electromagnetic induction heating and drying apparatus for coating battery electrodes according to claim 1, characterized in that, The lower sensor (4) and the lower ferrite core (3) are cured in the lower sensor encapsulation plate (5) with epoxy resin, and the lower sensor assembly is fixed to the lower tooling fixing plate (1) by two lower sensor connecting plates (2).

3. The electromagnetic induction heating and drying apparatus for coating battery electrodes according to claim 2, characterized in that, The upper sensor (7) and the upper ferrite core (8) are cured in the upper sensor encapsulation plate (6) with epoxy resin, and the upper sensor assembly is fixedly connected to the upper tooling fixing plate (10) through two upper sensor fixing plates (9).

4. The electromagnetic induction heating and drying apparatus for coating battery electrodes according to claim 3, characterized in that, The upper sensor (7) and the lower sensor (4) are connected in series. After being connected to high-frequency AC power, the current direction of the two is the same and the magnetic field is in the same direction. The magnetic field generates eddy currents on the coated electrode.

5. The electromagnetic induction heating and drying apparatus for coating battery electrodes according to claim 1, characterized in that, The guide shaft fixing support (14) is provided in four and installed on the lower tooling fixing plate (1). The guide shaft (13) is provided in four and passes through the guide shaft fixing support (14). The linear bearing (12) is provided in four and slides with the guide shaft (13) and is fixed on the upper tooling fixing plate (10). The cylinder (15) is provided in two and drives the upper tooling fixing plate (10) to move up and down along the guide shaft (13).

6. The electromagnetic induction heating and drying apparatus for coating battery electrodes according to claim 4, characterized in that, The position detection sensor is a photoelectric sensor, with the upper end of the lifting stroke corresponding to the belt threading / cleaning position and the lower end of the lifting stroke corresponding to the heating position.

7. The electromagnetic induction heating and drying apparatus for coating battery electrodes according to claim 6, characterized in that, The infrared thermometer has two channels, which are aimed at the upper and lower surfaces of the coated electrode sheet respectively, to monitor the temperature of the coated electrode sheet in real time.

8. A method for drying battery electrode coatings using electromagnetic induction heating, characterized in that, The electromagnetic induction heating and drying apparatus for coating battery electrodes as described in any one of claims 1-7 includes the following steps: Step 1: Control the lifting mechanism (11) to drive the upper sensor assembly to move up to the threading setting position, and pass the coated electrode sheet between the upper sensor assembly and the lower sensor assembly; Step 2: Control the lifting mechanism (11) to drive the upper sensor assembly to move down to the heating set position, connect the upper sensor (7) and the lower sensor (4) in series and then connect them to high frequency AC power so that the two generate magnetic fields in the same direction, thereby causing the coated electrode to generate eddy currents and heat up quickly and evenly. Step 3: The surface temperature of the coated electrode is monitored in real time at multiple points using two infrared thermometers. The high-frequency heating power supply adjusts the output parameters of the high-frequency AC power supply based on the temperature measurement feedback using a PID algorithm to stabilize the temperature of the coated electrode at the set value. Step 4: The coated electrode heats up to evaporate the solvent in the slurry from the inside out, thus completing the curing and drying of the slurry; when it is necessary to thread or clean, the lifting mechanism (11) is controlled to drive the upper sensor assembly to move up to the set position to complete the corresponding operation.

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