Lithium battery pole piece drying device

Abstract

This invention relates to the field of lithium battery electrode drying technology and discloses a lithium battery electrode drying device, including a drying mechanism. The drying mechanism comprises a first infrared drying chamber, a hot air drying chamber, and a second infrared drying chamber. Each of the first, hot air, and second infrared drying chambers is equipped with a partition to divide its interior into upper and lower sections for separately drying the coatings on the front and back sides of the electrode substrate. This three-section, faceted drying design addresses the different drying needs of the front and back coatings on the electrode substrate, achieving differentiated and precise drying on both sides, improving drying efficiency and quality, and shortening the overall drying time.

Description

Technical Field

[0001] This invention relates to the field of lithium battery electrode drying technology, specifically to a lithium battery electrode drying device. Background Technology

[0002] Electrode drying is a crucial step in lithium battery production. Traditional lithium battery electrode drying equipment mostly employs a single drying method, such as infrared drying or hot air drying alone. A single drying method is insufficient for the coating drying of the electrode substrate, resulting in uneven drying and low efficiency. Furthermore, some drying equipment cannot dry the front and back sides of the electrode substrate separately, causing the coating slurry on both sides to interfere with each other, affecting the quality and performance of the lithium battery electrodes. Therefore, a new type of lithium battery electrode drying equipment is urgently needed to solve these problems and improve the quality and efficiency of lithium battery production. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this application provides a lithium battery electrode drying device.

[0005] (II) Technical Solution

[0006] To solve the above problems, this application provides the following technical solution: a lithium battery electrode drying device, including a drying mechanism, wherein the drying mechanism includes a first infrared drying box, a hot air drying box and a second infrared drying box, wherein the first infrared drying box, the hot air drying box and the second infrared drying box are all provided with partitions to divide the interior of the first infrared drying box, the hot air drying box and the second infrared drying box into upper and lower parts, for drying the front and back coatings of the electrode substrate separately;

[0007] The first infrared drying box, the hot air drying box, and the second infrared drying box are all equipped with conveying rollers in their upper and lower parts for conveying electrode substrates. The first infrared drying box and the second infrared drying box are each equipped with two sets of infrared drying mechanisms, and the hot air drying box is equipped with two sets of hot air drying mechanisms.

[0008] The two sets of infrared drying mechanisms are a first radiator and a second radiator, respectively. Inside the first infrared drying chamber, the first radiator is located at the top and the second radiator is located at the bottom. Inside the second infrared drying chamber, the first radiator is located at the bottom and the second radiator is located at the top.

[0009] A coating mechanism is provided on one side of the first infrared drying oven for coating the electrode substrate on the front side. The coated electrode substrate passes through the lower part of the first infrared drying oven, the hot air drying oven, and the second infrared drying oven in sequence to dry the coated substrate. Another coating mechanism is provided on one side of the second infrared drying oven for coating the electrode substrate on the reverse side. The coated electrode substrate passes through the upper part of the first infrared drying oven, the hot air drying oven, and the second infrared drying oven in sequence to dry the coated substrate.

[0010] Preferably, the first infrared drying box, the hot air drying box, and the second infrared drying box are each provided with two sets of inlets and outlets on both sides for conveying and outputting the electrode substrate, and the adjacent inlets and outlets of the first infrared drying box, the hot air drying box, and the second infrared drying box are connected.

[0011] Preferably, the first radiator is a silicon carbide plate-type medium-to-long-wave radiator, and the second radiator is a tungsten filament halogen lamp tube short-wave infrared radiator.

[0012] Preferably, the coating mechanism includes a material trough for storing coating slurry, a coating roller is provided on one side of the material trough, a roller cutter is provided on the upper side of the coating roller, and a conveying roller is provided on the other side of the coating roller. The electrode substrate passes between the coating roller and the conveying roller, and the coating roller can coat the electrode substrate.

[0013] Preferably, two sets of guide rollers are provided on both sides of the drying mechanism. The two sets of guide rollers are located at the inlet and outlet of the drying mechanism, respectively, and are used to correct the electrode substrates inside the drying mechanism for conveying and outputting the material.

[0014] Preferably, a material roll roller is provided on one side of the coating mechanism. The material roll roller is used to store the uncoated electrode substrate. A tension roller group is provided between the material roll roller and the coating mechanism to release the stress on the electrode substrate.

[0015] Preferably, the drying device further includes a take-up roller for taking up the coated electrode substrate that has been dried on both sides inside the drying mechanism.

[0016] Preferably, the hot air drying box is equipped with a fan, the air outlet of the fan is connected to a main air duct, the upper and lower parts of the hot air drying box are respectively equipped with auxiliary air ducts, the main air duct and the auxiliary air duct are connected to each other, and the auxiliary air duct is connected to several sets of heating components through branch pipes, and the heating components are located above the conveyor roller.

[0017] Preferably, the heating assembly includes a fan shroud, inside which are arranged several sets of nozzles, the nozzles being connected to branch pipes, and a heating wire being arranged below the nozzles.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, this application provides a lithium battery electrode drying device, which has the following beneficial effects:

[0020] 1. This lithium battery electrode drying device adopts a three-stage split drying design, combining the synergistic effects of short-wave infrared rapid surface heating, hot air penetration to remove solvent, and medium- and long-wave infrared to promote curing. It achieves differentiated and precise drying on both sides to meet the different drying needs of the front and back coatings of the electrode substrate, thereby improving drying efficiency and quality and shortening the overall drying time.

[0021] 2. The lithium battery electrode drying device features a zoned drying design that effectively prevents the coating slurry on the front and back of the electrode substrate from affecting each other, ensuring the uniformity and consistency of the electrode coating.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the structure of a lithium battery electrode drying device according to this application;

[0025] Figure 2 This is a schematic diagram of the drying mechanism of this application;

[0026] Figure 3 This is a schematic diagram of the internal structure of the hot air drying oven in this application;

[0027] Figure 4 This is a schematic diagram of the internal structure of the first infrared drying oven of this application;

[0028] Figure 5 This is a schematic diagram of the side structure of the hot air drying box of this application.

[0029] Reference numerals: 100, roll roller; 200, tension roller group; 300, coating mechanism; 301, material trough; 302, roller cutter; 303, coating roller; 304, conveyor roller; 400, guide roller; 500, drying mechanism; 501, inlet; 502, outlet; 503, partition; 504, conveyor roller; 510, first infrared drying box; 511, first radiator; 512, second radiator; 520, hot air drying box; 521, fan; 522, hood; 523, main air duct; 524, auxiliary air duct; 525, branch pipe; 526, nozzle; 527, heating wire; 530, second infrared drying box; 600, take-up roller. Detailed Implementation

[0030] 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 skilled in the art without creative effort are within the scope of protection of this application.

[0031] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0032] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship 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.

[0033] In the description of this application, it should be noted that, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Please see Figures 1-5 This application provides a new technical solution: a lithium battery electrode drying device, including a drying mechanism 500. The drying mechanism 500 includes a first infrared drying box, a hot air drying box 520, and a second infrared drying box 530. The first infrared drying box, the hot air drying box 520, and the second infrared drying box 530 are all provided with partitions 503 to divide the interior of the first infrared drying box, the hot air drying box 520, and the second infrared drying box 530 into upper and lower parts for drying the front and back coatings of the electrode substrate separately.

[0035] The first infrared drying box, the hot air drying box 520 and the second infrared drying box 530 are both equipped with conveying rollers 504 in their upper and lower parts for conveying electrode substrates. The first infrared drying box and the second infrared drying box 530 are each equipped with two sets of infrared drying mechanisms, and the hot air drying box 520 is equipped with two sets of hot air drying mechanisms.

[0036] The two sets of infrared drying mechanisms are a first radiator 511 and a second radiator 512, respectively. Inside the first infrared drying box, the first radiator 511 is located at the top and the second radiator 512 is located at the bottom. Inside the second infrared drying box 530, the first radiator 511 is located at the bottom and the second radiator 512 is located at the top.

[0037] A coating mechanism 300 is provided on one side of the first infrared drying oven for coating the electrode substrate on the front side. The coated electrode substrate passes through the lower part of the first infrared drying oven, the hot air drying oven 520 and the second infrared drying oven 530 in sequence to dry the coated substrate on the front side. Another coating mechanism 300 is provided on one side of the second infrared drying oven 530 for coating the electrode substrate on the reverse side. The coated electrode substrate passes through the upper part of the first infrared drying oven, the hot air drying oven 520 and the second infrared drying oven 530 in sequence to dry the coated substrate on the reverse side.

[0038] The drying mechanism 500 adopts a three-section, split-sided drying design. The first infrared drying chamber, the hot air drying chamber 520, and the second infrared drying chamber 530 form independent upper and lower drying chambers through an internal partition 503. The electrode substrate first undergoes front-side coating by the first coating mechanism 300, then enters the lower part of the first infrared drying chamber, where short-wave infrared radiation (1.2-1.5μm) emitted by the second radiator 512 raises the surface temperature. Subsequently, in the lower part of the hot air drying chamber 520, hot air heated to 80-120℃ by heating wire 527 penetrates the coating pores and removes the solvent. Finally, in the lower part of the second infrared drying chamber 530, mid-to-long-wave infrared radiation (3-4μm) from the first radiator 511 promotes the cross-linking and curing of the binder. The electrode after reverse coating completes the same process path in the upper chamber, achieving differentiated drying on both sides.

[0039] In some embodiments, the first infrared drying box, the hot air drying box 520, and the second infrared drying box 530 are each provided with two sets of inlets 501 and outlets 502 on both sides for conveying and outputting electrode substrates. The adjacent inlets 501 and outlets 502 of the first infrared drying box, the hot air drying box 520, and the second infrared drying box 530 are connected. The inlets 501 and outlets 502 provided on both sides of each drying box are connected by flanges to form a continuous channel, and the electrode is transferred without tension between adjacent boxes by conveying rollers 504.

[0040] In some embodiments, the first radiator 511 is a silicon carbide plate-type medium-to-long-wave radiator, and the second radiator 512 is a tungsten filament halogen lamp tube short-wave infrared radiator. The first radiator 511 adopts a silicon carbide plate-type emitter (surface temperature 450±10℃), and its 3-4μm wavelength infrared radiation can penetrate to a depth of 150-200μm in the coating; the second radiator 512 is a tungsten filament halogen lamp tube array (single tube power 2kW), and its 1.2-1.5μm short-wave radiation raises the surface temperature to 90-100℃ within 10s.

[0041] In some embodiments, the coating mechanism 300 includes a material tank 301 for storing coating slurry. A coating roller 303 is disposed on one side of the material tank 301, a roller cutter 302 is disposed on the upper side of the coating roller 303, and a conveyor roller 304 is disposed on the other side of the coating roller 303. The electrode substrate passes between the coating roller 303 and the conveyor roller 304, and the coating roller 303 can coat the electrode substrate. The material tank 301 stores the coating slurry, and the electrode substrate passes between the coating roller 303 and the conveyor roller 304. The roller cutter 302 cooperates with the coating roller 303 to evenly coat the slurry in the material tank 301 onto the electrode substrate, thereby realizing the coating operation on the electrode substrate.

[0042] In some embodiments, two sets of guide rollers 400 are provided on both sides of the drying mechanism 500. These two sets of guide rollers 400 are located at the inlet 501 and outlet 502 of the drying mechanism 500, respectively, and are used to correct the electrode substrates conveyed and output from inside the drying mechanism 500. At the inlet 501 and outlet 502 of the drying mechanism 500, the guide rollers 400 guide and correct the conveyed and output electrode substrates. When the electrode substrates deviate, the guide rollers 400 adjust them to the correct conveying path through contact and friction with the electrode substrates.

[0043] In some embodiments, a material roll roller 100 is provided on one side of the coating mechanism 300. The material roll roller 100 is used to store uncoated electrode substrates. A tension roller group 200 is provided between the material roll roller 100 and the coating mechanism 300 to release the stress on the electrode substrates. The material roll roller 100 stores the uncoated electrode substrates and releases them during the production process. The tension roller group 200 releases the stress generated on the electrode substrates during the winding process by adjusting its own position and pressure, ensuring that the electrode substrates are smoothly transported to the coating mechanism 300 and maintaining a certain tension to prevent wrinkles, loosening, and other phenomena.

[0044] In some embodiments, the drying apparatus further includes a take-up roller 600 for taking up the coated electrode substrate dried on both sides inside the drying mechanism 500.

[0045] In some embodiments, a fan 521 is provided on the hot air drying box 520, and the air outlet of the fan 521 is connected to a main air duct 523. Auxiliary air ducts 524 are respectively provided in the upper and lower parts of the hot air drying box 520. The main air duct 523 is connected to the auxiliary air duct 524. The auxiliary air duct 524 is connected to several sets of heating components through branch pipes 525. The heating components are located above the conveying roller 504.

[0046] The fan 521 sends air into the main air duct 523. The air is then split into the upper and lower auxiliary air ducts 524, and then enters the heating assembly through the branch pipe 525. In the heating assembly, the air is ejected through the nozzles 526 inside the fan shroud 522, and after being heated by the heating wire 527 below, it forms hot air to dry the electrode substrate above the conveyor roller 504.

[0047] In some embodiments, the heating assembly includes a fan shroud 522, inside which are arranged a plurality of nozzles 526. The nozzles 526 are connected to a branch pipe 525, and a heating wire 527 is arranged below the nozzles 526. Air enters the fan shroud 522 through the branch pipe 525 and is evenly sprayed out through the nozzles 526. The sprayed air is heated when it passes through the heating wire 527 below, forming hot air that directly acts on the surface of the electrode substrate, carrying away the moisture in the coating slurry on the electrode substrate, thereby achieving drying.

[0048] Working Principle: In the operation of a lithium battery electrode drying device, uncoated electrode substrates are stored on a material roll roller 100. After production starts, the electrode substrates are released from the material roll roller 100 and pass through a tension roller group 200. The tension roller group 200 releases the stress generated on the electrode substrates during winding by adjusting its own position and pressure, ensuring that the electrode substrates enter the coating mechanism 300 under stable tension. Once in the coating mechanism 300, the coating slurry in the material trough 301 is evenly applied to the front side of the electrode substrate by the cooperation of the roller cutter 302 and the coating roller 303. The electrode substrates with the front side coated then enter the lower cavity of the first infrared drying chamber through the inlet 501. In the lower part of the first infrared drying chamber, a second radiator 512 achieves preliminary surface drying. Subsequently, the electrode substrate enters the lower cavity of the hot air drying chamber 520 through inlet 501. Fan 521 sends air into the main air duct 523, which is then split through the secondary air duct 524 and branch duct 525. The air is then ejected through nozzles 526 in the fan hood 522 and heated by the heating wire 527 below, forming hot air that penetrates the coating pores and carries away the solvent. Finally, the electrode substrate enters the lower cavity of the second infrared drying chamber 530, where the first radiator 511 promotes the cross-linking and curing of the adhesive, completing the drying process for the front coating. After front drying, the electrode substrate undergoes reverse coating via the coating mechanism 300 on one side of the second infrared drying chamber 530. After coating is completed, the electrode substrate sequentially enters the upper part of the second infrared drying box 530, the upper part of the hot air drying box 520, and the upper part of the first infrared drying box, repeating the front drying process. The back coating is dried by the corresponding drying mechanism at the top of each box. The electrode substrate dried on both sides is output from the outlet 502 of the first infrared drying box and finally wound up by the winding roller 600 to form a finished roll, which is convenient for subsequent storage, transportation and processing.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," 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 this application. In this specification, the 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.

[0050] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery electrode drying device, characterized in that, The drying mechanism includes a first infrared drying box, a hot air drying box, and a second infrared drying box. Each of the first infrared drying box, the hot air drying box, and the second infrared drying box is equipped with a partition to divide the interior of the first infrared drying box, the hot air drying box, and the second infrared drying box into upper and lower parts for drying the coatings on the front and back sides of the electrode substrate separately. The first infrared drying box, the hot air drying box, and the second infrared drying box are all equipped with conveying rollers in their upper and lower parts for conveying electrode substrates. The first infrared drying box and the second infrared drying box are each equipped with two sets of infrared drying mechanisms, and the hot air drying box is equipped with two sets of hot air drying mechanisms. The two sets of infrared drying mechanisms are a first radiator and a second radiator, respectively. Inside the first infrared drying chamber, the first radiator is located at the top and the second radiator is located at the bottom. Inside the second infrared drying chamber, the first radiator is located at the bottom and the second radiator is located at the top. A coating mechanism is provided on one side of the first infrared drying oven for coating the electrode substrate on the front side. The coated electrode substrate passes through the lower part of the first infrared drying oven, the hot air drying oven, and the second infrared drying oven in sequence to dry the coated substrate on the front side. Another coating mechanism is provided on one side of the second infrared drying oven for coating the electrode substrate on the back side. The coated electrode substrate passes through the upper part of the first infrared drying oven, the hot air drying oven, and the second infrared drying oven in sequence to dry the coated substrate on the back side.

2. The lithium battery electrode drying apparatus according to claim 1, characterized in that, The first infrared drying box, the hot air drying box, and the second infrared drying box are each provided with two sets of inlets and outlets on both sides for conveying and outputting electrode substrates. The adjacent inlets and outlets of the first infrared drying box, the hot air drying box, and the second infrared drying box are connected.

3. The lithium battery electrode drying apparatus according to claim 1, characterized in that, The first radiator is a silicon carbide plate-type medium-to-long-wave radiator, and the second radiator is a tungsten filament halogen lamp tube short-wave infrared radiator.

4. The lithium battery electrode drying apparatus according to claim 1, characterized in that, The coating mechanism includes a material trough for storing coating slurry. A coating roller is provided on one side of the material trough, and a roller cutter is provided on the upper side of the coating roller. A conveying roller is provided on the other side of the coating roller. The electrode substrate passes between the coating roller and the conveying roller, and the coating roller can coat the electrode substrate.

5. The lithium battery electrode drying apparatus according to claim 1, characterized in that, Two sets of guide rollers are provided on both sides of the drying mechanism. The two sets of guide rollers are located at the inlet and outlet of the drying mechanism, respectively, and are used to correct the electrode substrates inside the drying mechanism during conveying and output.

6. The lithium battery electrode drying apparatus according to claim 1, characterized in that, A material roll roller is provided on one side of the coating mechanism. The material roll roller is used to store the uncoated electrode substrate. A tension roller group is provided between the material roll roller and the coating mechanism to release the stress of the electrode substrate.

7. The lithium battery electrode drying apparatus according to claim 1, characterized in that, The drying device also includes a take-up roller for taking up the coated electrode substrate that has been dried on both sides inside the drying mechanism.

8. The lithium battery electrode drying apparatus according to claim 1, characterized in that, The hot air drying box is equipped with a fan, and the air outlet of the fan is connected to a main air duct. The upper and lower parts of the hot air drying box are respectively equipped with auxiliary air ducts. The main air duct and the auxiliary air duct are connected. The auxiliary air duct is connected to several sets of heating components through branch pipes. The heating components are located above the conveyor roller.

9. A lithium battery electrode drying apparatus according to claim 8, characterized in that, The heating assembly includes a fan shroud, inside which are arranged several sets of nozzles. The nozzles are connected to branch pipes, and heating wires are arranged below the nozzles.

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