WO2024021934A1

WO2024021934A1 - Coater oven

Info

Publication number: WO2024021934A1
Application number: PCT/CN2023/101261
Authority: WO
Inventors: 刘克; 顾成言; 张建昌; 金刚卫; 廖树奥
Original assignee: 比亚迪股份有限公司
Priority date: 2022-07-29
Filing date: 2023-06-20
Publication date: 2024-02-01
Also published as: CN117463580A

Abstract

A coater oven. The coater oven comprises an oven body, an upper shelf, a lower shelf and a heating plate, wherein the oven body has an accommodating space; the upper shelf and the lower shelf are oppositely accommodated in the accommodating space; and the heating plate is arranged between the upper shelf and the lower shelf. The heating plate comprises a substrate, an infrared layer and an insulating heat insulation sheet, wherein the infrared layer is laminated on the substrate, and the insulating heat insulation sheet covers the side of the infrared layer facing away from the substrate.

Description

Coating machine oven

This application is required to be submitted to the China Patent Office on July 29, 2022, with the application number 202221992375.7, and the application name is "Heating plate and coating machine oven" and on January 10, 2023, the Chinese Patent Office is submitted with the application number 202310032718.8. Priority is granted to a Chinese patent application entitled "Coater Oven", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of lithium battery pole piece coating, and specifically relates to a coating machine oven.

Background technique

The front-end process is a key step in the production and preparation of lithium batteries. The quality of the front-end process not only has a profound impact on the performance of the battery cells, but also seriously affects production efficiency and costs. As we all know, the coating machine oven technology is one of the most complex and difficult technologies in the entire front-end process. Some coating machine ovens dry the pole pieces through hot air, but the energy efficiency is low, the baking rate is low, and the quality of the pole pieces is poor. Some coating machine ovens use hot air drying and infrared radiation heating, which have many advantages over simply using hot air drying.

The current infrared solution mainly uses infrared lamps as the baking infrared source. A coating machine needs to be equipped with 50-150 lamps, which is expensive and the life of the infrared lamp is only 10,000 hours. The life is short, and the infrared lamp Due to its high temperature, additional devices for cooling the lamp and devices for monitoring the temperature of the lamp are required, which is costly.

Therefore, the current coating machine oven has problems of poor baking effect and high cost.

Contents of the invention

This application provides a coating machine oven to solve the technical problems of poor baking effect and high cost of the coating machine oven.

In order to solve the above technical problems, this application provides the following technical solutions.

This application provides a coating machine oven. The coating machine oven includes a box body, an upper hull, a lower hull, and a heating plate. The box has an accommodation space. The upper hull and the lower hull are relatively received in the accommodation space. The heating plate is arranged between the upper hull and the lower hull. The heating plate includes a substrate, an infrared layer, and an insulating heat shield. The infrared layer is laminated on the substrate. The insulation and heat shielding sheet covers the side of the infrared layer facing away from the substrate.

In one embodiment, the surface of the upper hull facing the lower hull is provided with a plurality of first air nozzles arranged at intervals, and the surface of the lower hull facing the upper hull is provided with a plurality of first air nozzles arranged at intervals. A second air nozzle; the coating machine oven also includes a bracket, the bracket is connected to the upper hull and/or the lower hull, and is located between the two adjacent air nozzles, and the heating plate is fixed on said stand.

In one embodiment, the first air nozzle and the second air nozzle are arranged oppositely or staggeredly.

In one embodiment, the bracket includes an installation frame; the installation frame includes a main body and a connecting piece, each of the opposite sides of the main body is connected to a connecting piece, and each connecting piece is equipped with a heating plate.

In one embodiment, the heating plate further includes an electrode sheet and an insulating sealing member; the electrode sheet is disposed on the substrate and connected to the infrared layer, and the electrode sheet is used to electrically connect with a wire; The insulating and heat-insulating sheet is provided with wiring holes in at least part of the area corresponding to the electrode sheet; the insulating sealing member has a receiving cavity, and is provided with an opening and a wiring hole connected to the receiving cavity, and the opening is connected to the receiving cavity. Corresponding to the wiring hole, the wire extends from the wiring hole into the accommodation cavity and passes through the opening and the wiring hole to be connected to the electrode sheet. The accommodation cavity is filled with insulating glue.

In one embodiment, the end of the opening of the insulating closure is in contact with the electrode sheet, and the outer surface of the insulating closure is in close contact with the side wall of the wiring hole.

In one embodiment, the insulating closure has a step structure at an end facing away from the opening, and the step structure A glue injection hole is provided on the top, and the distance between the glue injection hole and the electrode sheet is smaller than the distance between the wiring hole and the electrode sheet.

In one embodiment, the corners of the step structure facing the inside of the accommodation cavity are rounded.

In one embodiment, the inner wall of the accommodation cavity is smooth, and the surface roughness at the rounded corners is less than 0.25.

In one embodiment, the heating plate further includes a fastener, which is connected to the wire and the electrode sheet and used to fix the wire and the electrode sheet.

In one embodiment, the heating plate further includes a reflective sheet covering a side of the insulation sheet facing away from the substrate.

In one embodiment, the heating plate further includes a sealing member, which is disposed on the side of the insulating and heat-insulating sheet and connected to the base plate to seal the gap between the base plate and the insulating and heat-insulating sheet. the gap between.

In one embodiment, the heating plate further includes a reinforcing plate, and the reinforcing plate is disposed on a side of the infrared layer facing away from the substrate.

In one embodiment, the insulating and heat-insulating sheet has a flat plate structure.

By setting a heating plate between the upper hull and the lower hull, the heating plate is an infrared plate. The infrared plate can be heated. Compared with the existing technology, it has the advantages of lower price, longer life, and lower temperature of the infrared plate itself. The baking effect of the coating machine oven is improved and the cost is reduced.

Description of drawings

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of a coating machine oven according to an embodiment.

Figure 2 is a partial enlarged schematic diagram of position A in Figure 1.

Figure 3 is a side view, a bottom view and a cross-sectional view of a heating plate according to an embodiment.

Figure 4 is a partial enlarged schematic diagram of position B in Figure 3.

FIG. 5 is a schematic diagram of an embodiment at C in FIG. 3 .

FIG. 6 is a schematic diagram of another embodiment at C in FIG. 3 .

Explanation of reference symbols:
1000-coating machine oven, 100-box, 101-accommodating space, 102-input hole, 103-output hole, 110, 120, 130,
140-air duct, 150-outrigger; 200-upper hull, 201-lower surface of upper hull, 210-first air nozzle, 300-lower hull, 310-second air nozzle, 400-pole piece, 500-bracket , 510-base frame, 511-first mounting piece, 520-mounting frame, 521-main part, 522-connecting piece, 523-reinforcement rib, 524-second mounting piece, 525-third mounting piece; 600-heating Board, 61-substrate, 62-infrared layer, 63-electrode sheet, 64-insulation heat shield, 641-wiring hole, 65-insulation closure, 651-accommodating cavity, 652-opening, 653-wiring hole, 654 -Glue injection hole, 655-round corner, 66-fastener, 661-first fastener, 662-second fastener, 67-reflective sheet, 68-seal, 69-reinforcement plate.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all knowledge obtained by those of ordinary skill in the art without any creative efforts Other implementations fall within the scope of protection of this application.

It should be noted that when a component is said to be "anchored" to another component, it can be directly on the other component or there can also be an intermediate component. When a component is said to be "connected" to another component, it can be directly connected to the other component or there may be intermediate components present at the same time.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by a person skilled in the technical field of this application. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments may be combined with each other without conflict.

Please refer to Figure 1, which provides a common coating machine oven 1000, including a box 100, an upper hull 200 and a lower hull 300.

The box 100 has, for example, a rectangular parallelepiped structure. The box 100 has an accommodation space 101. The upper hull 200 and the lower hull 300 are relatively accommodated in the accommodation space 101. The upper hull 200 and the lower hull 300 are spaced apart.

The box 100 is also provided with an air duct, and the air duct may be partially arranged inside the upper hull 200 or the lower hull 300 , and may be partially arranged outside the upper hull 200 or the lower hull 300 . As shown in Figure 1, an air duct 110 is provided in the upper hull 200, an air duct 130 is provided outside the upper hull 200, an air duct 120 is also provided in the lower hull 300, and an air duct 140 is provided outside the lower hull 300. The air duct 130 can be connected to the air duct 110, the air duct 140 can be connected to the air duct 120, and the air duct 130 and the air duct 140 can also be connected.

The box 100 is provided with an input hole 102 and an output hole 103 that penetrate inside and outside. The positions of the input hole 102 and the output hole 103 correspond to the gap between the upper hull 200 and the lower hull 300 . The box body 100 is also connected to a plurality of legs 150, and the legs 150 are fixed on the ground or other tables. The legs 150 may be of a telescopic structure, and the height of the box 100 may be adjusted.

When the coating machine oven 1000 is working, the pole piece 400 enters the accommodation space 101 through the input hole 102, and the wind supplied by the air ducts 110, 120, 130, and 140 flows out through the upper hull 200 and the lower hull 300, so that the pole piece 400 is in the upper hull 200 It is in a suspended state with the lower hull 300 without contacting other structures. The pole piece 400 exits from the output hole 103 after baking.

Among the current oven baking solutions, one is to bake the pole pieces through hot air. Specifically, the hot oil is heated by burning natural gas, and then the hot oil heats the air through the heat exchanger. The hot air passes through the circulating fan to form hot air, and finally the hot air dries the pole pieces. This baking scheme has three major shortcomings: (1) low energy efficiency. On the one hand, when hot air bakes the pole pieces, it inevitably heats the entire oven box, and the surface of the box is seriously heated. On the other hand, after the hot air heats the pole pieces, waste heat needs to be recovered through a waste heat recovery system, which is limited by the waste heat recovery efficiency. Most of the heat in the hot air is lost. Therefore, the current energy efficiency of the coating machine oven is very low, only 10%-30%; (2) The baking rate is low. Hot air heating pole pieces belong to contact and convection heating, and the heat transfer efficiency is low. The current drying rate of the pole pieces has reached the bottleneck, making it difficult to further increase the tape transport speed (positive electrode 60m/min, negative electrode 70/min), which seriously hinders the increase in production capacity. ; (3) The pole pieces are of poor quality. Since the hot air heating pole piece is a contact heating, during the heating process, the surface temperature of the pole piece is much higher than the internal temperature. On the one hand, this causes the internal stress of the pole piece to be large, causing cracking of the pole piece. On the other hand, the solvent on the surface of the pole piece evaporates quickly. Inducing the adhesive to float, causing the pole piece to peel off and decrease.

To solve the above problems, the development of new coating machine oven technology is the only way to go. As an efficient non-contact heating, infrared heating has been widely used in all aspects of industrial manufacturing. The high efficiency of infrared heating (theoretical energy utilization efficiency is as high as 70%) can effectively reduce the energy consumption of the coating machine oven and save energy costs. In addition, infrared heating is a type of thermal radiation heat transfer with high heat transfer efficiency, which can significantly increase the drying rate of the pole pieces, thereby increasing production capacity (it is expected to increase the belt conveying speed by 10-30m/min). More importantly, the high penetration performance of infrared heats up the temperature from both the inside and outside of the pole piece at the same time, thereby effectively improving the cracking problem of the pole piece, easing the floating of the binder, and obtaining better coating structure and performance.

Despite its many advantages, infrared baked pole piece technology is currently not widely used in the lithium battery industry. The main reason is that the current industry generally uses infrared lamps as oven infrared sources, and infrared lamps have obvious shortcomings: 1) high price. Single The price of lamps is more than RMB 10,000, and a coating machine oven needs to be equipped with 50-150 lamps, resulting in high one-time investment costs; 2) short lifespan. The life of the infrared lamp is only 10,000 hours, which means that the lamp needs to be replaced every year to ensure the normal operation of the oven, which further increases the investment cost; 3) The temperature of the infrared lamp itself is high (1000~2000°C). On the one hand, an air cooling system needs to be configured to ensure the service life of the lamp. On the other hand, a rigorous feedback adjustment system needs to be designed to prevent the foil from oxidizing or the pole piece from cracking due to over-baking. These not only further increase the investment cost, but also This makes infrared baking technology too complex and involves high risks in mass production.

To this end, embodiments of the present application propose improvements to address the above problems. Please refer to Figure 1. Based on the current oven, a heating plate 600 is provided between the upper hull 200 and the lower hull 300. The heating plate 600 can be disposed at any position between the upper hull 200 and the lower hull 300 , such as on the lower surface of the upper hull 200 and the upper surface of the lower hull 300 .

The heating plate 600 includes a substrate 61 , an infrared layer 62 and an insulating and heat-insulating sheet 64 . The infrared layer 62 is stacked on the substrate 61 . The insulating and heat-insulating sheet 64 covers the side of the infrared layer 62 facing away from the substrate 61 .

The substrate 61 is an insulating material, specifically black crystal glass, with a thickness of 1mm-10mm. The substrate 61 is used as a structural foundation. If the substrate 61 is too thin, it will have insufficient mechanical properties and thermal stability. If it is too thick, it will hinder thermal radiation and reduce heat transfer efficiency. When the thickness is reduced to 1mm-10mm, it can have good mechanical properties, good thermal stability, and little hindrance to thermal radiation.

The infrared layer 62 is stacked on the substrate 61. The infrared layer 62 can be made of carbon material or alloy material and is used to emit infrared rays. The thickness of the infrared layer 62 may be 1 μm-100 μm.

The insulation sheet 64 covers the side of the infrared layer 62 facing away from the substrate 61 . The insulating and heat-insulating sheet 64 has insulating properties, and together with the substrate 61 seals the infrared layer 62 to prevent the infrared layer 62 from contacting the external environment and preventing the infrared layer 62 from leaking electricity to the environment through the insulating and heat-insulating sheet 64; the insulating and heat-insulating sheet 64 also has Thermal insulation performance. The infrared layer 62 is energized to generate infrared rays. The infrared rays will heat various structures. The heat insulation sheet has a heat insulation function and can cause heat to radiate outward from one side of the substrate 61. The insulating heat insulation sheet 64 faces away from the side of the substrate 61. There is very little heat and the heat can be fully utilized. 1, 2, and 5, when the heating plate 600 is installed on the bracket 500, one side of the base plate 61 can be turned away from the upper hull 200 and toward the lower hull 300. In this way, the heat on the bracket 500 is less, and the bracket can be avoided. 500 and upper hull 200 temperatures are too high and affect performance.

Specifically, the insulation sheet 64 may be aerogel, mica sheet, fiberglass board, industrial ceramic sheet, etc. The thickness can be 0.1mm-20mm, and the thermal insulation efficiency should be 5%-100%.

The heating plate 600 uses the infrared layer 62 to emit infrared rays for heating, so that the heating plate 600 is an infrared plate. The advantages of infrared boards are as follows: 1) Lower price. The price of a single infrared panel is 500-1,000 yuan. Compared with infrared lamps, it reduces the one-time investment cost by about 90%; 2) It has a longer life. The life span reaches 20,000 hours, which is twice that of infrared lamps; 3) The temperature of the infrared panel itself is low (300-400°C), so no additional cooling system is required, and the feedback adjustment system is correspondingly simple.

Therefore, the coating machine oven 1000 provided by the embodiment of the present application is provided with a heating plate 600 between the upper hull 200 and the lower hull 300. The heating plate 600 is an infrared plate. The infrared plate can be heated, and compared with the existing technology It has the advantages of lower price, longer life, and lower temperature of the infrared plate itself, which improves the baking effect of the coating machine oven 1000 and reduces the cost.

In one embodiment, please refer to FIG. 1 , the upper hull 200 and the lower hull 300 are each provided with a plurality of air nozzles arranged at intervals on the opposite surfaces. Specifically, the lower surface of the upper hull 200 is provided with a plurality of first air nozzles 210 arranged at intervals, and the upper surface of the lower hull 300 is provided with a plurality of second air nozzles 310 arranged at intervals. The plurality of first air nozzles 210 and the plurality of second air nozzles 310 are both connected to the air duct. The first air nozzles 210 and the second air nozzles 310 can be arranged oppositely or staggeredly. The heating plate 600 may also be provided on the first air nozzle 210 and/or the second air nozzle 310 .

Optionally, please refer to Figures 1 and 2. The coating machine oven 1000 also includes a bracket 500. The bracket 500 is connected to the upper hull 200 and/or the lower hull 300 and is located between two adjacent air nozzles. The plate 600 is fixed to the bracket 500 .

The bracket 500 can be any feasible structure, and can be connected only to the lower surface of the upper hull 200 or to the upper surface of the lower hull 300. The bracket 500 can also be connected to the lower surface of the upper hull 200 and the upper surface of the lower hull 300 at the same time. The bracket 500 is connected to the upper hull 200 and/or the lower hull 300 in a manner including but not limited to screwing, snapping, welding, etc. The number of brackets 500 may be multiple, and one or more brackets 500 may be provided between two adjacent air nozzles, without any limitation.

Optionally, as shown in FIG. 2 , taking the bracket 500 being connected to the lower surface 201 of the upper hull 200 as an example. The bracket 500 includes a base frame 510 and a mounting frame 520. The base frame 510 is welded and fixed to the lower surface 201 of the upper hull 200. The base frame 510 is provided with a first mounting member 511; the mounting frame 520 is provided with a second mounting member 524. A mounting component 511 is connected to a second mounting component 524 to install the mounting bracket 520 to the base frame 510 . The heating plate 600 may be mounted to the mounting bracket 520 in any feasible manner. One of the first mounting part 511 and the second mounting part 524 may be a bolt, and the other may be a nut. Of course, the first mounting part 511 and the second mounting part 524 may also have other structures.

When the mounting bracket 520 and the base frame 510 are installed, the distance between the mounting bracket 520 and the base frame 510 can be set to an adjustable structure, so that the position of the mounting bracket 520 can be adjusted.

Optionally, the mounting bracket 520 includes a main part 521 and a connecting part 522. Each of the opposite sides of the main part 521 is connected to a connecting part 522. The main part 521 and the connecting part 522 form a "several" structure as a whole. A heating plate 600 can be installed on each connecting member 522 . In order to enhance the structural strength of the connecting part 522 and the main part 521, reinforcing ribs 523 may also be provided, and the reinforcing ribs 523 connect the main part 521 and the connecting part 522.

The second mounting part 524 is provided on the main part 521 , and the main part 521 is connected to the base frame 510 . A third mounting piece 525 can be provided on the connecting piece 522. When the heating plate 600 is installed, the heating plate 600 and the connecting piece 522 are connected and fixed through the third mounting piece 525. The third mounting member 525 may be a screw, and the number thereof may be multiple.

By fixing the heating plate 600 on the bracket 500, and the bracket 500 is connected to the upper hull 200 and/or the lower hull 300, and is located between two adjacent air nozzles, the heating plate 600 is installed in the free space. There is no need for additional installation space, and the existing coating machine oven can be modified to obtain the coating machine oven 1000 in the embodiment of the present application.

When in use, according to the baking temperature requirements, you can choose to use the hot air heating of the air nozzle alone, or use the heating plate 600 alone for heating, or use the air nozzle and the heating plate for heating at the same time. When used at the same time, compared with the current only The solution with air nozzles can significantly increase the baking temperature and speed.

The heating plate 600 will be further described below.

Usually infrared panels are mainly used in home heating, automobile painting and other fields. Due to the special internal environment of the coating machine oven (the negative electrode oven is high temperature and high humidity, the positive electrode oven is high temperature and high concentration of NMP) and its actual operating conditions, there may be metal electrode terminals in existing infrared panels directly applied to the coating machine oven. The problem of exposure is that exposed terminals will leak electricity in the special environment of the oven, and there is a risk of sparks, which is a safety hazard.

Please refer to FIG. 3 and FIG. 5 . This embodiment of the present application provides a heating plate 600 , which also includes an electrode sheet 63 and an insulating sealing member 65 .

The electrode sheet 63 is disposed on the substrate 61 and connected to the infrared layer 62. The electrode sheet 63 is used for electrical connection with wires (not shown in the figure). The material of the electrode sheet 63 can be silver, which has good electrical properties. The electrode piece 63 can be located on the side of the infrared layer 62 , and one end is connected to the side of the infrared layer 62 . The electrode sheet 63 is electrically connected to the wire, and the wire is connected to the power supply. The current is transmitted to the infrared layer 62 through the wire and the electrode sheet 63, so that the infrared layer 62 is energized and works. Except for the joints, other locations of the wires are covered with an insulating film. In addition to the position where the electrode sheet 63 is used for electrical connection with the wire, an insulating sheet (not shown in the figure) can be attached to other positions. The thickness of the insulating sheet is ≤0.2mm and the temperature resistance is ≥100°C.

The insulating and heat-insulating sheet 64 covers the side of the infrared layer 62 and the electrode sheet 63 facing away from the substrate 61 . The insulating and heat-insulating sheet 64 has wiring holes 641 in at least part of the area corresponding to the electrode sheet 63 . The insulating sealing member 65 has an accommodating cavity 651, and is provided with an opening 652 and a wiring hole 653 connected to the accommodating cavity 651. The opening 652 and the wiring hole 641 can be located at two opposite ends of the insulating closing member 65, with corresponding positions, and the wires can run by themselves. The wire hole 653 extends into the accommodation cavity 651, and passes through the opening 652 and the wiring hole 641 to connect with the electrical connector. The pole piece 63 is connected. Afterwards, the accommodation cavity 651 is filled with insulating glue (not shown in the figure).

The insulating sealing member 65 is made of insulating material, specifically ceramic material. The insulating glue can be ceramic glue with temperature resistance ≥300℃. In this way, the wires extend into the accommodating cavity 651 and are electrically connected to the electrode sheets 63. Due to the insulating glue at the joints of the wires, all conductive positions are covered with insulating materials, and no conductive positions are exposed.

By providing the insulating sealing member 65 , the wires pass through the wiring holes 653 of the insulating sealing member 65 and are electrically connected to the electrode sheets 63 . The accommodating cavity 651 of the insulating sealing member 65 is filled with insulating glue, and combined with the insulating heat shield sheet 64 , the infrared layer 62 is The covering effect of the infrared layer 62, the electrode sheet 63 and the joints of the wires are all covered with insulating materials, and no conductive parts are exposed. When the heating plate 600 is used in a high temperature and high humidity or high temperature and high concentration NMP environment, it will not There is no risk of electric sparks due to current leakage, which can eliminate safety hazards.

Optionally, please refer to FIG. 5 . The end of the opening 652 of the insulating sealing member 65 is in contact with the electrode sheet 63 , and the outer surface of the insulating sealing member 65 is in close contact with the side wall of the wiring hole 641 . In this way, the wiring hole 641 can be closed, that is, there is a seamless structure between the side wall of the wiring hole 641 and the insulating sealing member 65 to prevent the electrode sheet 63 from being exposed to the external environment through the gap there.

Optionally, please refer to Figures 3 to 5. The insulating sealing member 65 has a step structure at one end facing away from the opening 652. A glue injection hole 654 is provided on the step structure. The distance between the glue injection hole 654 and the electrode sheet 63 is smaller than the distance between the glue injection hole 654 and the electrode sheet 63. The distance between the wire hole 653 and the electrode sheet 63. In other words, as shown in Figure 5, the glue injection hole 654 and the wiring hole 653 are at different heights. In the view of Figure 5, the glue injection hole 654 is at a higher position. After the wire hole 653 is connected to the electrode sheet 63, insulating glue is injected into the accommodating cavity 651 through the higher injection hole 654. The insulating glue gradually flows to various places in the accommodating cavity 651 under the action of gravity, such as the wiring hole 653. wait. After that, the insulating glue is cured, which can be cured by heating, light irradiation, etc. In this way, the joints of the wires, the electrode pads 63 and other structures can be sealed. The insulating glue has adhesive properties. After the accommodating cavity 651 is filled with the insulating glue, the insulating glue can also bond and fix the insulating sealing member 65 and the electrode sheet 63 .

During the process of injecting the insulating glue, a structure such as tape can be used to seal the gap between the side wall of the wiring hole 653 and the outer wall of the wire to prevent the insulating glue from leaking through the wiring hole. After the glue injection is completed, the glue injection hole 654 can also be closed using tape or other structures.

Optionally, please refer to FIG. 5 , the inner wall of the accommodation cavity 651 can be provided with a smooth structure, and the sharp corners of the step structure in the accommodation cavity 651 are rounded corners 655 . The radius of the rounded corner 655 can be set as needed, and the surface roughness Ra at the rounded corner 655 can be less than 0.25. The smooth structure facilitates the flow of insulating glue.

Optionally, please refer to FIG. 5 . The heating plate 600 also includes a fastener 66 , which is connected to the electrode sheet 63 and used to fix the wires and the electrode sheet 63 . Fastener 66 may be of any feasible configuration, such as a standard threaded electrode. Optionally, the fastener 66 includes a first fastener 661 and a second fastener 662. The first fastener 661 can be a bolt and the second fastener 662 can be a nut. The electrode sheet 63 can be provided with a through hole, the first fastener 661 is inserted through the through hole, the side of the screw rod faces away from the base plate 61, and the second fastener 662 screws with the screw rod of the first fastener 661 on the side of the electrode sheet 63 facing away from the base plate 61. catch. The wire is wound around the screw of the first fastener 661 on the side of the electrode sheet 63 facing away from the substrate 61, and then tightened using the second fastener 662, so that the wire and the electrode sheet 63 are in close contact without loosening. Optionally, the fastener 66 is a conductive structure. The wire can be connected to the fastener 66 , and the fastener 66 is connected to the electrode sheet 63 . The current flows from the wire through the fastener 66 and then into the electrode sheet 63 .

Optionally, please refer to Figure 5. A receiving groove can be provided on one side surface of the substrate 61, and the portion of the infrared layer 62, the electrode sheet 63 and the first fastener 661 can be accommodated in the receiving groove. The insulating and heat-insulating sheet 64 can be roughly a flat plate structure, so that the overall thickness can be reduced and the structure can be more compact.

Optionally, please refer to FIG. 5 . The heating plate 600 also includes a reflective sheet 67 . The reflective sheet 67 covers the side of the insulation sheet 64 facing away from the substrate 61 . The reflective sheet 67 can specifically be an aluminum sheet, a titanium dioxide film, a cesium tungstate (CsWO4) film, etc., without limitation. The functions of the reflective sheet 67 are reflection, heat insulation and sealing.

Optionally, please refer to FIG. 5 . The heating plate 600 also includes a sealing member 68 . The sealing member 68 is disposed on the insulation sheet 64 . side, and is connected to the base plate 61 to close the gap between the base plate 61 and the insulation sheet 64 .

The sealing member 68 is made of insulating material, which may be ceramic glue, and has a long-term temperature resistance of greater than or equal to 300°C. Optionally, as shown in FIG. 5 , the length of the base plate 61 is longer than the insulation and heat shielding sheet 64 , and the sealing member 68 can be connected to the surface of the base plate 61 facing the insulation and heat shielding sheet 64 . Optionally, the length of the base plate 61 can also be substantially consistent with the length of the insulating and heat-insulating sheet 64 , that is, if the insulating and heat-insulating sheet 64 is flush with the sides of the base plate 61 , the sealing member 68 can be disposed on both sides.

In another embodiment, please refer to FIG. 6 , which is basically the same as the embodiment shown in FIG. 5 . The difference is that the heating plate 600 also includes a reinforcing plate 69 , and the reinforcing plate 69 is disposed on the side of the infrared layer 62 facing away from the substrate 61 .

Specifically, the reinforcing plate 69 can be disposed between the insulating and heat-insulating sheet 64 and the base plate 61 , or between the reflective sheet 67 and the insulating and heat-insulating sheet 64 , or on the side of the reflective sheet 67 facing away from the base plate 61 . The reinforcing plate 69 can be made of the same material as the base plate 61 to reinforce the structure and prevent partial layer structures from being deformed by heat.

As shown in FIG. 5 , in order to enable the insulating sealing member 65 to be connected to the electrode sheet 63 , a through hole the same as the wiring hole 641 can be opened on the reflective sheet 67 , and the insulating sealing member 65 passes through the through hole and the wiring hole 641 . Connected to the electrode sheet 63. As shown in FIG. 6 , the reinforcing plate 69 can also be provided with the same through hole. In the embodiment of FIG. 6 , the sealing member 68 can close the gap between the base plate 61 and the insulating and heat-insulating sheet 64 , close the gap between the reinforcing plate 69 and the insulating and heat-insulating sheet 64 , and close the gap between the reflective sheet 67 and the reinforcing plate 69 Clearance.

In the description of the embodiments of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship of indicators such as "" is based on the orientation or positional relationship described in the drawings. It is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or original mentioned must have a specific orientation or a specific location. orientation construction and operation, and therefore cannot be construed as a limitation on this application.

What is disclosed above is only an illustrative embodiment of the present application. Of course, it cannot be used to limit the scope of rights of the present application. Those of ordinary skill in the art can understand all or part of the processes for implementing the above embodiments and follow the claims of the present application. Any equivalent changes made will still fall within the scope of this application.

Claims

A coating machine oven (1000), which is characterized by including:

The box (100) has an accommodation space (101);

An upper hull (200) and a lower hull (300), which are relatively received in the accommodation space; and a heating plate (600), which is disposed between the upper hull and the lower hull. between the lower hull; the heating plate includes a base plate (61), an infrared layer (62), and an insulating heat shielding sheet (64). The infrared layer is laminated on the base plate, and the insulating heat shielding sheet covers the The infrared layer faces away from the side of the substrate.
The coating machine oven according to claim 1, characterized in that a plurality of first air nozzles (210) arranged at intervals are provided on the surface of the upper hull facing the lower hull, and the lower hull faces the surface of the lower hull. The surface of the above-mentioned hull is provided with a plurality of second air nozzles (310) arranged at intervals; the coating machine oven also includes a bracket (500), the bracket is connected to the upper hull and/or the lower hull, And located between two adjacent air nozzles, the heating plate is fixed on the bracket.
The coating machine oven according to claim 2, wherein the first air nozzle and the second air nozzle are arranged oppositely or staggeredly.
The coating machine oven according to claim 2, characterized in that the bracket includes a mounting frame (520); the mounting frame includes a main body piece (521) and a connecting piece (522), and the main body pieces are opposite to each other. There is a connecting piece connected to each side, and each connecting piece is equipped with a heating plate.
The coating machine oven according to claim 1, characterized in that the heating plate further includes an electrode sheet (63) and an insulating closure (65);

The electrode sheet is arranged on the substrate and connected to the infrared layer. The electrode sheet is used for electrical connection with wires; the insulating and heat-insulating sheet is provided with wiring holes in at least part of the area corresponding to the electrode sheet ( 641);

The insulating sealing member has an accommodation cavity (651), and is provided with an opening (652) and a wiring hole (653) connected to the accommodation cavity. The opening corresponds to the wiring hole, and the conductor is self-propelled. The wire hole extends into the accommodation cavity and is connected to the electrode sheet through the opening and the wiring hole. The accommodation cavity is filled with insulating glue.
The coating machine oven according to claim 5, characterized in that the end of the opening of the insulating closure is in contact with the electrode sheet, and the outer surface of the insulating closure is in contact with the side of the wiring hole. The wall is tight.
The coating machine oven according to claim 5, characterized in that the insulating sealing member has a step structure at one end facing away from the opening, and a glue injection hole (654) is provided on the step structure. The distance between the glue hole and the electrode sheet is smaller than the distance between the wiring hole and the electrode sheet.
The coating machine oven according to claim 7, characterized in that the corners of the step structure facing into the accommodation cavity are rounded (655).
The coating machine oven according to claim 8, characterized in that the inner wall of the accommodation cavity is smooth, and the surface roughness at the rounded corners is less than 0.25.
The coating machine oven according to any one of claims 5 to 9, characterized in that the heating plate further includes a fastener (66), the fastener is connected to the wire and the electrode sheet, And used to fix the wire and the electrode sheet.
The coating machine oven according to any one of claims 5 to 10, characterized in that the heating plate further includes a reflective sheet (67) covering the insulating and heat-insulating sheet facing away from the substrate. side.
The coating machine oven according to any one of claims 5 to 11, characterized in that the heating plate further includes a sealing member (68), the sealing member is provided on the side of the insulating and heat-insulating sheet and is connected with the insulating heat-insulating sheet. The base plates are connected to close the gap between the base plates and the insulation and heat shielding sheets.
The coating machine oven according to any one of claims 5 to 12, characterized in that the heating plate further includes a reinforcing plate (69), the reinforcing plate is disposed on a side of the infrared layer facing away from the substrate. side.
The coating machine oven according to any one of claims 1 to 13, characterized in that the insulating and heat-insulating sheet has a flat structure.