An electrode drying apparatus and equipment

Abstract

This utility model relates to the technical field of lithium-ion battery manufacturing equipment, specifically an electrode drying device and equipment. The electrode drying device includes a drying chamber; the electrode drying device is disposed inside the drying chamber and includes a shell, a first sliding assembly, a light source assembly, and at least two reflectors; the at least two reflectors are disposed within a receiving space, and the at least two reflectors are used to divide the receiving space into at least three drying areas; the at least two reflectors are movable relative to the first sliding assembly to change their position within the receiving space, and the positional movement of the at least two reflectors can adjust the length of at least one of the at least three drying areas; this utility model divides the receiving space into at least three drying areas by using reflectors, thereby achieving staged drying of the electrode, and simultaneously adjusting the length of the drying areas by flexibly adjusting the position of the reflectors within the receiving space, thereby adjusting the drying effect of at least three drying areas.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium-ion battery manufacturing equipment, and in particular to an electrode drying device and equipment. Background Technology

[0002] Lithium-ion batteries have advantages such as small size, high energy, and no pollution, and are increasingly widely used in portable electronic products such as mobile phones, digital cameras, and laptops.

[0003] In the manufacturing process of lithium-ion batteries, drying is one of the key steps, directly affecting the mechanical properties of the electrodes and the electrochemical performance of the battery. Traditional electrode drying equipment typically employs methods such as hot air circulation drying and infrared drying. However, these methods still suffer from the following technical shortcomings in practical applications: Currently used drying ovens, which rely on traditional light sources, struggle to meet the drying requirements of lithium-ion battery electrodes with varying specifications and process requirements, making precise drying control difficult. Traditional drying ovens lack flexibility and adaptability in the face of these changes. Furthermore, existing drying equipment traditionally relies on prolonged high-temperature heating, resulting in high energy consumption, low drying efficiency, reduced production cycle time, and increased manufacturing costs. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model sets up a reflector, a first sliding component and a light source component, so as to divide the accommodating space into at least three drying areas by the reflector, thereby realizing the staged drying of the electrode sheet. At the same time, by flexibly adjusting the position of the reflector in the accommodating space, the length of at least one drying area in the at least three drying areas can be adjusted, thereby adjusting the drying effect of at least three drying areas.

[0005] This utility model provides an electrode drying device, which is applied to an electrode drying equipment. The electrode drying equipment includes a drying chamber. The electrode drying device is disposed inside the drying chamber and includes a shell, a first sliding assembly, a light source assembly, and at least two reflectors.

[0006] One side of the first sliding component is fixedly connected to the drying oven, and the other side of the first sliding component is slidably connected to the reflector.

[0007] The light source assembly is disposed on the side of the drying oven where the first sliding assembly is located;

[0008] The housing has a receiving space, and the at least two reflectors are disposed within the receiving space. The at least two reflectors are used to divide the receiving space into at least three drying areas. The at least two reflectors are movable relative to the first sliding assembly to change their position within the receiving space. The positional movement of the at least two reflectors can adjust the length of at least one drying area among the at least three drying areas.

[0009] Furthermore, the sliding direction of the first sliding component is set parallel to the moving direction of the electrode.

[0010] Furthermore, at least one side of the reflector is a reflective surface, and the reflective surface is provided with a reflective structure for reflecting the light emitted by the light source assembly.

[0011] Furthermore, the electrode drying device also includes a driving component, which is drivenly connected to the reflector and is capable of moving the reflector relative to the first sliding component.

[0012] Furthermore, the reflector is arranged parallel to the cross-section of the housing; wherein the moving direction of the electrode is perpendicular to the cross-section.

[0013] Furthermore, the electrode drying device also includes a second sliding assembly, one side of which is fixedly connected to the drying chamber, and the other side of which is slidably connected to the light source assembly.

[0014] Furthermore, the first sliding assembly includes a sliding rail and a slider that are slidably engaged. The sliding rail is fixedly disposed on the top of the drying oven, and the slider is fixedly connected to the reflector.

[0015] This utility model also protects an electrode drying device, including the electrode drying apparatus and the rubber roller conveying assembly as described above, wherein the electrode is wound around the rubber roller conveying assembly, and the rubber roller conveying assembly can drive the electrode to pass through the at least three drying areas in sequence.

[0016] Furthermore, the electrode drying equipment also includes a controller, which is communicatively connected to both the light source assembly and the drive assembly, and the controller is configured to:

[0017] If a drying instruction for the electrode is received, obtain the light power density and weight configuration parameters of the light source components required for at least three drying areas;

[0018] Using the light power density of each of the at least three dry regions and the weight configuration parameters as inputs to the dry region length calculation model, the dry region length is calculated to obtain the dry length of each dry region;

[0019] The control drive component drives the at least two reflectors to slide relative to the first sliding component until each of the at least three drying regions reaches the required drying length;

[0020] The control unit starts the rubber roller conveying assembly and drives the electrode sheet to pass through the at least three drying zones in sequence for drying.

[0021] Furthermore, the controller is also configured to:

[0022] If the light power density of the light source component is not obtained, the drying length of each of the at least three drying regions is obtained;

[0023] Using the drying length of each of the at least three drying regions and the weight configuration parameters as inputs to the drying region length calculation model, the optical power density of the light source components required for each of the at least three drying regions is calculated to obtain the optical power density of the light source components required for each of the drying regions.

[0024] The light source assembly is activated, and the light intensity of the light source assembly is adjusted to achieve the required light power density in each of the dry areas;

[0025] The procedure involves controlling the start of the rubber roller conveying assembly and driving the electrode sheet sequentially through the at least three drying zones for drying.

[0026] Implementing the embodiments of this utility model has the following beneficial effects:

[0027] This invention relates to an electrode drying device installed inside a drying chamber. This device ensures effective drying without altering the original drying chamber structure and adapts to the electrode drying needs of lithium-ion batteries with various specifications and process requirements. This significantly improves the versatility and flexibility of the electrode drying equipment and reduces equipment replacement costs. The device utilizes a cooperating reflector, a first sliding assembly, and a light source assembly. The reflector divides the accommodating space into at least three drying zones, enabling staged drying of the electrode. Furthermore, by flexibly adjusting the position of the reflector within the accommodating space, the length of at least one of the three drying zones can be adjusted, thereby regulating the drying effect and achieving precise drying control to shorten drying time, reduce defect rates caused by uneven drying, and improve overall production efficiency. Additionally, the light source assembly allows for different light intensities in the three drying zones to meet the precise drying requirements of various lithium-ion battery electrodes, improving drying quality and production efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this utility model. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0029] Figure 1 This is a structural diagram of the electrode drying apparatus in this embodiment;

[0030] Figure 2 This is a structural diagram of the electrode drying device and the drying oven in this embodiment.

[0031] The corresponding reference numerals in the figure are as follows:

[0032] 1-Housing; 2-First sliding assembly; 3-Reflector; 4-Electrode; 5-Drying oven; 6-Fan. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0034] It should be noted that the term "an embodiment" or "embodiment" as used in the embodiments of this application refers to a specific feature, structure, or characteristic that can be included in at least one implementation of this application. In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0035] See appendix Figures 1-2This embodiment provides an electrode drying device, applied to an electrode drying equipment, which includes a drying chamber 5. The electrode drying device is disposed within the drying chamber 5 and includes a housing 1, a first sliding assembly 2, a light source assembly, and at least two reflectors 3. One side of the first sliding assembly 2 is fixedly connected to the drying chamber 5, and the other side of the first sliding assembly 2 is slidably connected to the reflectors 3. The light source assembly is disposed on the side of the drying chamber 5 where the first sliding assembly 2 is located. The housing 1 has a receiving space, and at least two reflectors 3 are disposed within the receiving space, which divides the receiving space into at least three drying areas. The at least two reflectors 3 are movable relative to the first sliding assembly to change their position within the receiving space, and the movement of the at least two reflectors 3 can adjust the length of at least one of the at least three drying areas. The electrode drying device of this invention is disposed within the drying chamber 5, achieving the drying without altering the original structure of the drying chamber 5. Based on this, the device ensures drying effect and can adapt to the electrode drying needs of lithium-ion batteries with various specifications and process requirements, greatly improving the versatility and flexibility of electrode drying equipment and reducing the replacement cost of electrode drying equipment. The electrode drying device of this utility model, by setting up a reflector 3, a first sliding component 2 and a light source component that cooperate with each other, divides the accommodating space into at least three drying areas through the reflector 3, thereby realizing the staged drying of the electrode 4. At the same time, by flexibly adjusting the position of the reflector 3 in the accommodating space, the length of at least one of the at least three drying areas can be adjusted, thereby adjusting the drying effect and achieving precise drying control to shorten the electrode drying time, reduce the defect rate caused by uneven drying, and thus improve the overall production efficiency. At the same time, by setting up a light source component, different light intensities can be set in at least three drying areas to meet the precise drying needs of electrode sheets of various lithium-ion batteries, improving drying quality and production efficiency.

[0036] It is understood that the electrode drying device in this embodiment can divide the accommodating space by setting the reflector 3 to form multiple drying areas. The electrode 4 is driven by the rubber roller conveying assembly to pass through multiple drying areas in stages for drying. This can meet the preparation of electrode 4 in lithium-ion batteries with different process requirements and achieve precise drying control of electrode 4. At the same time, after the position of the reflector 3 is adjusted, the light intensity emitted by the light source assembly can also be adjusted to meet the drying requirements of different drying areas, thereby achieving the precise drying requirements of electrode 4.

[0037] Specifically, in this embodiment, the drying needs of different drying areas can be met by changing the position of the reflector 3, the position of the light source component, or the light intensity emitted by the light source component, so as to achieve the effect of precise staged drying.

[0038] In this embodiment, the electrode drying device is provided with at least two reflectors 3. The specific number of reflectors 3 is not set in this embodiment, as long as it meets the number of drying areas required by the user.

[0039] In the case where the electrode drying device requires three drying areas, the electrode drying device is provided with two reflective plates 3 to divide the receiving area into three drying areas, and both sides of the reflective plates 3 are reflective surfaces; the electrode drying device is provided with four reflective plates 3 to divide the receiving area into three drying areas, and one side of the reflective plates 3 is a reflective surface; based on the provision of three drying areas, in order to increase the light intensity without changing the light source components, reflective plates 3 with one side having a reflective surface can be provided on both sides of the receiving space to increase the light intensity of the drying areas on both sides of the receiving space.

[0040] In this embodiment, the light source assembly is a component capable of drying the electrode 4. To ensure that the light source assembly can dry each of the at least three drying areas, the light source assembly includes at least the same number of light source elements as the number of drying areas. Preferably, the light source elements can be infrared heating tubes, LEDs, VCSELs (vertical cavity surface emission lasers), or laser generators.

[0041] In this embodiment, the top of the receiving space is located close to the light source assembly, and the electrode 4 can move from the bottom of the receiving space under the drive of the rubber roller conveying assembly. The surface of the electrode 4 is arranged parallel to the top and bottom of the receiving space, respectively.

[0042] In some possible embodiments, the sliding direction of the first sliding component 2 is parallel to the moving direction of the electrode 4. This arrangement ensures that the reflector 3 connected to the first sliding component 2 can move along the moving direction of the electrode 4, thereby forming at least three drying areas along the length of the drying chamber 5. This ensures that the electrode 4 passes through at least three drying areas in sequence under the drive of the rubber roller conveying component, thus ensuring the drying effect and drying quality of the electrode 4.

[0043] In this embodiment, the number of first sliding components 2 is not limited. That is, the first sliding components 2 are set on the top of the drying box 5 according to actual needs. The number of first sliding components 2 is one, two or more. When the number of first sliding components 2 is at least two, at least two first sliding components 2 are arranged at intervals along the width direction of the drying box 5.

[0044] Preferably, there are two first sliding components 2, and the two first sliding components 2 are arranged at intervals on the top of the drying box 5 along the width direction of the drying box 5.

[0045] In this embodiment, the specific structure of the first sliding component 2 is not limited, as long as the first sliding component 2 can drive the reflector 3 to move within the accommodating space.

[0046] Preferably, the first sliding component 2 includes a sliding rail and a slider that are slidably engaged. The sliding rail is fixedly disposed on the top of the drying chamber 5, and the length direction of the sliding rail is parallel to the length direction of the drying chamber 5. The slider is fixedly connected to the reflector 3.

[0047] Specifically, the number of sliders in each group of first sliding components 2 is set to correspond one-to-one with the number of reflectors 3.

[0048] In other possible embodiments, the first sliding component 2 can also be a magnetic levitation rail or a pulley assembly. The specific structure of the magnetic levitation rail or pulley assembly is not limited, as long as it can drive the reflector 3 to reciprocate within the accommodating space. Specifically, when the first sliding component 2 is a pulley assembly, the pulley assembly includes at least one first pulley, at least one second pulley, a first rope wound around at least one first pulley, a second rope wound around at least one second pulley, a first rope drive member, and a second rope drive member. One end of the first rope is fixedly connected to the reflector 3 after passing through at least one first pulley, and the other end of the first rope is fixedly connected to the first rope drive member. The first rope drive member drives the reflector 3 to move along a first direction. One end of the second rope is fixedly connected to the reflector 3 after passing through at least one second pulley, and the other end of the second rope is fixedly connected to the second rope drive member. The second rope drive member drives the reflector 3 to move along a second direction, wherein the first direction is opposite to the second direction. The first rope and the second rope in the same group of first sliding components 2 are connected to the same reflector 3, thus enabling the reflector 3 to reciprocate within the accommodating space.

[0049] In some possible embodiments, at least one side of the reflector 3 is a reflective surface, and a reflective structure is provided on the reflective surface for scattering the light emitted by the light source assembly. The reflective structure can improve the illumination effect of the light source assembly on the electrode 4, and reduce the energy consumption of the light source assembly and the drying cost of the electrode 4 without changing the required light intensity of the drying area.

[0050] Specifically, the reflective structure has a special texture on the reflective surface, which is evenly distributed across the reflective surface. Preferably, the reflective surface has a textured surface with concave and convex structures.

[0051] In this embodiment, one side of the reflector 3 is a reflective surface or the opposite two sides of the reflector 3 are reflective surfaces.

[0052] In some possible embodiments, the electrode drying device further includes a driving component that is driven to the reflector 3. The driving component can drive the reflector 3 to move relative to the first sliding component 2. By setting the driving component to drive the reflector 3 to move, the position of the reflector 3 can be precisely controlled. Compared with manually adjusting the position of the reflector 3, the adjustment speed of the reflector 3 can also be improved.

[0053] In this embodiment, the specific structure of the driving component is not limited, as long as the driving component can drive the reflector 3 to move relative to the first sliding component 2. Preferably, the driving component is a motor. After the controller issues a command, the motor drives the slider to move on the slide rail, thereby adjusting the position of the reflector 3. A high-precision stepper motor is used, which can accurately control the moving distance of the reflector and ensure the accuracy of the drying area division.

[0054] In this embodiment, the driving component can drive each reflector 3 in the electrode drying device to slide relative to the first sliding component 2 to form at least three drying areas; the driving component can also drive only some of the reflectors 3 in the electrode drying device to slide relative to the first sliding component 2 to form at least three drying areas.

[0055] In some possible embodiments, for example, the driving assembly moves only two reflectors 3 to form three drying areas of the required length. To form three drying areas, at least four reflectors 3 are required. Along the moving direction of the electrode 4, two reflectors 3 are located at opposite ends of the housing 1, and the other two reflectors 3 are located inside the housing 1. Both sides of the other two reflectors 3 are reflective surfaces. The two reflectors 3 located at opposite ends of the housing 1 are fixed relative to the housing 1. The driving assembly moves the other two reflectors 3 inside the housing 1 to form three drying areas of the required drying length.

[0056] In some possible embodiments, the reflector 3 is arranged parallel to the cross-section of the housing 11; wherein the moving direction of the electrode 4 is arranged perpendicular to the cross-section. By arranging the reflector 3 and the cross-section of the housing 11 parallel, it is possible to ensure that the space of the drying area separated by the reflector 3 is regular, and to avoid the obstruction of the light emitted by the light source assembly due to the irregularity of the drying area space, which would cause different drying effects in different areas of the electrode 4.

[0057] In this embodiment, at least two reflectors 3 are arranged in parallel within the accommodating space, and the reflectors 3 are arranged in parallel with the cross-section of the housing 11.

[0058] In some possible embodiments, the electrode drying device further includes a second sliding component. One side of the second sliding component is fixedly connected to the drying chamber 5, and the other side of the second sliding component is slidably connected to the light source component. By setting the second sliding component, the light source component connected to the second sliding component can be moved relative to the drying area to adjust the light intensity of the drying area, thereby achieving the effect of flexibly adjusting the light area and intensity, and thus meeting the precise drying requirements of the electrode 4 of various lithium-ion batteries and improving the drying quality.

[0059] In this embodiment, the specific structure of the second sliding component is not limited, as long as the second sliding component can drive the light source component to move.

[0060] Preferably, the second sliding component includes a sliding rail and a slider that are slidably engaged. The sliding rail is fixedly disposed on the top of the drying chamber 5, and the slider is fixedly connected to the light source component. The length direction of the sliding rail can be set to be parallel to the length direction of the drying chamber 5, or it can be set to be parallel to the width direction of the drying chamber 5. This setting ensures that the light source component can move along the length direction of the drying chamber 5 and / or along the width direction of the drying chamber 5.

[0061] In some other possible embodiments, the second sliding component may also be a magnetic levitation rail or a pulley assembly. The specific structure of the magnetic levitation rail or pulley assembly is not limited, as long as it can drive the reflector 3 to move back and forth in the accommodating space.

[0062] This utility model also protects an electrode drying device, including the electrode drying device and the rubber roller conveying assembly as described above. The electrode 4 is wound around the rubber roller conveying assembly. The rubber roller conveying assembly can drive the electrode 4 through at least three drying areas in sequence. By setting the rubber roller conveying assembly, the electrode 4 can be conveyed, ensuring that the electrode 4 can pass through at least three drying areas in sequence for drying, thus ensuring the drying effect and drying quality of the electrode 4.

[0063] In this embodiment, the electrode drying equipment includes two rubber roller conveying assemblies, which are respectively arranged on both sides of the drying chamber 5. The arrangement direction of the two rubber roller conveying assemblies is consistent with the length direction of the drying chamber 5. The drying chamber 5 is provided with electrode inlet and electrode outlet on opposite sides of the rubber roller conveying assemblies. The electrode 4 enters the drying chamber 5 through the electrode inlet and passes through at least three drying zones in sequence, and leaves the drying chamber 5 through the electrode outlet. The arrangement direction of the electrode inlet and electrode outlet is consistent with the length direction of the drying chamber 5. The rubber roller conveying assembly near the electrode inlet can be regarded as an unwinding mechanism, and the rubber roller conveying assembly near the electrode outlet can be regarded as a winding mechanism.

[0064] Specifically, the shapes of the electrode inlet and outlet are adapted to the shape of electrode 4. Both the electrode inlet and outlet are elongated holes, and the length of the elongated holes is consistent with the width of the accommodating space.

[0065] Specifically, the rubber roller conveying assembly can control the moving speed of the electrode sheet, and the electrode sheet 4 moves at the same speed through at least three drying zones.

[0066] In some possible embodiments, the electrode drying equipment further includes a coating roller assembly that cooperates with a rubber roller conveying assembly near the electrode feed inlet to coat the surface of the electrode 4 with a slurry, which is then dried in a drying chamber 5.

[0067] In some possible embodiments, the electrode drying equipment also includes a fan 6, which is disposed inside the drying chamber 5. The fan 6 can promote the air circulation inside the drying chamber 5. The inner wall of the drying chamber 5 is provided with an air outlet and an air inlet. Air can be blown into the drying chamber 5 through the air outlet, and air can be extracted from the drying chamber 5 through the air inlet.

[0068] In this embodiment, the specific locations of the air outlet and air inlet are not limited, as long as they can complete the blowing and sucking operations.

[0069] In this embodiment, the electrode drying equipment includes at least one drying chamber 5, which are arranged adjacent to each other along the moving direction of the electrode 4. The number of drying chambers 5 included in the electrode drying equipment is set according to the actual situation, and the number of drying areas in each drying chamber 5 is also set according to the actual situation, and is not limited here.

[0070] The working process of the electrode drying equipment is as follows: The coating roller assembly and the rubber roller conveying assembly are started. The coating roller assembly and the rubber roller conveying assembly work together to coat the surface of the electrode 4 with slurry. The rubber roller conveying assembly drives the electrode 4 into the drying chamber 5 through the electrode feed port and drives the electrode 4 through at least three drying zones in sequence. The electrode 4 is dried in each of the at least three drying zones. During the drying process, the fan 6 promotes the gas circulation in the drying chamber 5 and draws the gas containing a large amount of moisture out of the drying chamber 5 through the air intake port. At the same time, drying gas is injected into the drying chamber 5 through the air outlet port. After the electrode 4 has completed drying through at least three drying zones, the rubber roller conveying assembly drives the electrode 4 out of the electrode discharge port. At this time, the drying of the electrode 4 is completed.

[0071] In some possible embodiments, the electrode drying apparatus further includes a controller, which is communicatively connected to both the light source assembly and the drive assembly, and is configured to:

[0072] If a drying instruction is received for electrode 4, obtain the light power density and weight configuration parameters of the light source components required for each of the three drying areas;

[0073] The drying length of each drying region is calculated by taking the optical power density and weight configuration parameters of each of the at least three drying regions as inputs to the drying region length calculation model.

[0074] The control drive component drives at least two reflectors 3 to slide relative to the first sliding component 2 until each of the at least three drying areas reaches the required drying length;

[0075] The controller starts the rubber roller conveying assembly and drives the electrode 4 through at least three drying zones in sequence for drying. After receiving the drying command for the electrode 4, the controller can use the light power density and weight configuration parameters of each of the at least three drying zones as input to the drying zone length calculation model to calculate the drying zone length and obtain the drying length of each drying zone. It can also control the drive assembly to drive at least two reflectors 3 to slide relative to the first sliding assembly 2 until each of the at least three drying zones reaches the required drying length. After the reflectors 3 have moved, the controller controls the electrode 4 to pass through the three drying zones in sequence for drying. This enables the staged drying of the electrode 4. At the same time, by flexibly adjusting the position of the reflectors 3 in the accommodating space, the length of at least one of the at least three drying zones can be adjusted, thereby adjusting the drying effect. In addition, by setting the light source assembly, different light intensities can be set for the at least three drying zones to meet the precise drying requirements of the electrode 4 of various lithium-ion batteries, thereby improving drying quality and production efficiency.

[0076] It is understandable that the light power density of the light source components required for at least three drying areas is a known parameter, while the length required for the drying area is an unknown parameter. The length required for the drying area is determined by the light power density and weight configuration parameters, and the reflector 3 is controlled to move relative to the first sliding component 2 until the required length for the drying area is reached.

[0077] In some possible embodiments, the controller is also configured to:

[0078] If the light power density of the light source component is not obtained, obtain the drying length of each of the at least three drying regions;

[0079] Using the drying length and weight configuration parameters of each of the at least three drying regions as input to the drying region length calculation model, the optical power density of the light source components required for each of the at least three drying regions is calculated to obtain the optical power density of the light source components required for each drying region.

[0080] The system controls the activation of the light source assembly and adjusts the light intensity of the light source assembly to achieve the required light power density in each drying area.

[0081] The controller initiates the process of starting the control roller conveyor assembly and driving the electrode 4 through at least three drying zones sequentially for drying. Before obtaining the light power density of the light source assembly, the controller uses the drying length and weight configuration parameters of each of the at least three drying zones as input to the drying zone length calculation model. It then calculates the required light power density of the light source assembly for each of the at least three drying zones, obtaining the required light power density for each drying zone. The controller can also control the start of the light source assembly and adjust its illumination intensity to achieve the required light power density for each drying zone. After adjusting the illumination intensity or position of the light source assembly, the controller controls the electrode 4 to sequentially pass through the three drying zones for drying. This allows for staged drying of the electrode 4. Simultaneously, by flexibly adjusting the position of the reflector 3 within the accommodating space, the length of at least one of the at least three drying zones can be adjusted, thereby regulating the drying effect. Furthermore, by setting the light source assembly, different illumination intensities can be set for at least three drying zones to meet the precise drying requirements of various lithium-ion battery electrode 4, improving drying quality and production efficiency.

[0082] Understandably, the drying length of each of the at least three drying regions is a known parameter, while the optical power density is an unknown parameter. By configuring the optical power density and weight parameters, the required optical power density of the drying region is determined, the light source component is started, and the illumination intensity of the light source component is adjusted so that each drying region reaches the required optical power density.

[0083] In some possible embodiments, the controller is also configured to:

[0084] The solvent density, latent heat of vaporization of the solvent, absorption rate of electrode 4, moving speed of electrode 4, and initial thickness of electrode 4 are obtained.

[0085] The proportionality coefficient is determined based on the solvent density in electrode 4, the latent heat of vaporization of the solvent, the absorption rate of electrode 4, the moving speed of electrode 4, and the initial thickness of electrode 4; wherein, the proportionality coefficient corresponding to each drying area is the same, and the proportionality coefficient is defined as A.

[0086] After each drying zone is dried, the volume fraction difference of electrode 4 is obtained;

[0087] The weighting parameters for each drying zone are determined based on the proportional coefficient and the volume fraction difference of electrode 4 corresponding to each drying zone.

[0088] Specifically, the moving speed of electrode 4 is v, which is the belt speed of the rubber roller conveyor assembly, and the solvent density in electrode 4 is ρ. L The latent heat of vaporization of the solvent is L, and the absorption rate of electrode 4 is μ. a The initial thickness of electrode 4 is dwet All of the above parameters are known parameters, and the above parameters are the same for each drying area. Therefore, the calculated proportional coefficients are all the same.

[0089] In this embodiment, the volume fraction of the electrode 4 corresponding to each drying area is different. Taking three drying areas as an example, the weighting parameters corresponding to the three drying areas are determined. Specifically, the three drying areas are divided into the first drying area, the second drying area and the third drying area in sequence according to the moving direction of the electrode 4.

[0090] The volume fraction difference in the first drying zone is equal to θ. L,ini -θ L,C θ L,ini θ is the volume fraction of the solvent in the initial wet electrode. L,C =∈×ε V Where ∈ is the dry electrode porosity, ∈ = 0.2-0.8, generally taken as 0.52, ∈ = 1-θ S *d wet / d dry , where θ S This is the volume fraction of the solid components in the wet electrode, which can be calculated based on the specific ratio; ε V It is the volume shrinkage rate, ε V =d dry / d wet , where d wet It is the set coating thickness, d dry This corresponds to the thickness after drying. For specific formulations and coating thicknesses, ∈ and d dry If one is known, the other can be calculated.

[0091] The volume fraction difference in the second drying zone is equal to θ. L,C -θ L,T θ L,T It is a specific volume fraction of the solvent, generally set to 15-25%, with the actual value set according to the specific circumstances.

[0092] The moisture content of the electrode after passing through the third zone decreases to the residual saturation θ. * The volume fraction difference in the third drying region is equal to θ L,T -θ * ;

[0093] In this embodiment, when three drying zones are set, the parameters of the first drying zone must satisfy the equation: μ a ×P1×x1 / v1=E=(θ L,ini -θ L,C )×d wet ×ρ L ×L, μ av1, d wet ρ L The proportionality coefficient is obtained by combining it with L, P1 = A(θ) L,ini -θ L,C x1; specifically, P1 is set larger, and at the same conveyor speed, length x1 is set smaller; where P1 is the optical power density applied to the first region (unit: watts / m²). 2 x1 is the length of the first drying region.

[0094] The parameters of the second drying zone must satisfy the equation: μ a ×P2×x2 / v2=(θ L,C -θ L,T )×d wet ×ρ L ×L, μ a v2, d wet ρ L The proportionality constant is obtained by combining it with L, P2 = A(θ) L,C -θ L,T x2; specifically, P2 is set larger, and at the same conveyor speed, length x2 is set smaller; where P2 is the optical power density applied to the second region (unit: watts / m²). 2 x2 is the length of the second drying region.

[0095] The parameters of the third drying zone must satisfy the equation: μ a ×P3×x3 / v3=(θ L,T -θ * )×d wet ×ρ L ×L, μ a v3 d wet ρ L The proportionality coefficient is obtained by combining it with L, P3 = A(θ) L,T -θ * x3; specifically, P3 is set larger, and at the same conveyor speed, length x3 is set smaller; where P3 is the optical power density applied to the third region (unit: watts / m²). 2 x3 is the length of the third drying zone; where residual saturation θ* refers to the volume ratio of a certain phase fluid in a porous medium that remains in the pores and cannot be displaced after the displacement process, under specific conditions. The experimental results under standard atmospheric pressure show a water content (mass fraction) of 0-2%, preferably below 1%.

[0096] In this embodiment, the optical power density (in watts per square meter, W / m²) of the third drying region is set. 2 The equation is satisfied: P3≤2×h c ×(Tth -T amb ), where h c Convection heat transfer coefficient (unit: W / (m²·Kelvin)) 2 K)), T th This refers to the electrode damage threshold (unit: Kelvin K). The material system in Table 1 is at 150℃, T amb It is the ambient temperature (unit: Kelvin K).

[0097] Preferably, P2≥P1, v1=v2=v3.

[0098] The electrode 4 to be dried in this embodiment consists of a current collector and an active component layer. The material composition of the active component layer is shown in Table 1.

[0099] Table 1

[0100]

[0101] It should be noted that electrode sheet 4 to be dried is the negative electrode sheet. In the active component layer, graphite serves as the negative electrode active material; carbon black serves as a conductive agent; CMC is carboxymethyl cellulose, whose functions in the negative electrode slurry include thickening and preventing sedimentation, stabilizing the electrode's processing performance, assisting in improving battery cycle performance, increasing the electrode sheet's peel strength, dispersing the negative electrode active material and conductive agent, and assisting in bonding; SBR is styrene-butadiene rubber, used to provide adhesion between negative electrode active material particles and between the active material layer and the current collector.

[0102] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0103] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0104] The above-disclosed embodiment is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pole piece drying device applied to a pole piece drying equipment, the pole piece drying equipment comprising a drying oven (5); the pole piece drying device is arranged in the drying oven (5), characterized in that, The electrode drying device includes a housing (1), a first sliding assembly (2), a light source assembly, and at least two reflectors (3); One side of the first sliding component (2) is fixedly connected to the drying box (5), and the other side of the first sliding component (2) is slidably connected to the reflector (3); The light source assembly is disposed on the side of the drying oven (5) where the first sliding assembly (2) is located; The housing (1) has a receiving space, and the at least two reflectors (3) are disposed in the receiving space, the at least two reflectors (3) being used to divide the receiving space into at least three drying areas; The at least two reflectors (3) are movable relative to the first sliding assembly to change their position within the receiving space, and the positional movement of the at least two reflectors (3) is capable of adjusting the length of at least one drying region among the at least three drying regions.

2. The electrode drying apparatus according to claim 1, characterized in that, The sliding direction of the first sliding component (2) is parallel to the moving direction of the electrode (4).

3. The electrode drying apparatus according to claim 1, characterized in that, At least one side of the reflector (3) is a reflective surface, and a reflective structure is provided on the reflective surface for reflecting the light emitted by the light source assembly.

4. The electrode drying apparatus according to claim 1, characterized in that, The electrode drying device further includes a driving component, which is drivenly connected to the reflector (3) and can drive the reflector (3) to move relative to the first sliding component (2).

5. The electrode drying apparatus according to any one of claims 1-4, characterized in that, The reflector (3) is arranged parallel to the cross-section of the housing (1); wherein the moving direction of the electrode (4) is perpendicular to the cross-section.

6. The electrode drying apparatus according to any one of claims 1-4, characterized in that, The electrode drying device further includes a second sliding assembly, one side of which is fixedly connected to the drying chamber (5), and the other side of which is slidably connected to the light source assembly.

7. The electrode drying apparatus according to any one of claims 1-4, characterized in that, The first sliding component (2) includes a sliding rail and a slider that are slidably engaged. The sliding rail is fixedly disposed on the top of the drying box (5), and the slider is fixedly connected to the reflector (3).

8. An electrode drying device, characterized in that, The device includes an electrode drying apparatus and a rubber roller conveying assembly as described in any one of claims 1-7, wherein the electrode (4) is wound around the rubber roller conveying assembly, and the rubber roller conveying assembly is capable of driving the electrode (4) to pass through the at least three drying areas in sequence.

9. The electrode drying equipment according to claim 8, characterized in that, The electrode drying equipment further includes a controller, which is communicatively connected to both the light source assembly and the drive assembly, and the controller is configured to: If a drying instruction is received for the electrode (4), obtain the light power density and weight configuration parameters of the light source components required for each of the three drying areas; Using the light power density of each of the at least three dry regions and the weight configuration parameters as inputs to the dry region length calculation model, the dry region length is calculated to obtain the dry length of each dry region; The control drive component drives the at least two reflectors (3) to slide relative to the first sliding component (2) until each of the at least three drying regions reaches the required drying length; The control roller conveying assembly is started and drives the electrode (4) to pass through the at least three drying areas in sequence for drying.

10. The electrode drying equipment according to claim 9, characterized in that, The controller is also configured to: If the light power density of the light source component is not obtained, the drying length of each of the at least three drying regions is obtained; Using the drying length of each of the at least three drying regions and the weight configuration parameters as inputs to the drying region length calculation model, the optical power density of the light source components required for each of the at least three drying regions is calculated to obtain the optical power density of the light source components required for each of the drying regions. The light source assembly is activated, and the light intensity of the light source assembly is adjusted to achieve the required light power density in each of the dry areas; The step of controlling the rubber roller conveying assembly to start and drive the electrode (4) through the at least three drying zones in sequence for drying is performed.

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