Laser drying oven and drying equipment

Abstract

The utility model discloses a laser drying oven and drying equipment, the laser drying oven comprises an oven body, a laser heater and an air guide mechanism, the laser heater and the air guide mechanism are arranged on the oven body, the air guide mechanism comprises an air inlet assembly and an air outlet assembly, the air inlet assembly comprises an air inlet channel and a first coaming, and the air outlet assembly comprises an air outlet channel and a second coaming. The air inlet assembly comprises an air inlet channel and a first surrounding plate, the first surrounding plate and one side of the box body define an air inlet cavity, the air outlet assembly comprises an air outlet channel and a second surrounding plate, the second surrounding plate and the other side of the box body define an air outlet cavity, and the first surrounding plate and the second surrounding plate are each provided with a plurality of ventilation holes. Airflow flows from the air inlet cavity to the air outlet cavity to form parallel airflow, the flowing direction of the parallel airflow is consistent with the conveying direction of the pole piece, and the drying equipment comprises a plurality of laser drying ovens. According to the drying oven, NMP gas volatilized into the oven body can be taken away, explosion in the oven body is avoided, the safety of the drying oven is improved, and pole pieces can be prevented from shaking and cracking after being dried.

Description

Technical Field

[0001] The utility model relates to the technical field of battery industry, in particular to a laser drying oven and drying equipment. Background Art

[0002] During the electrode coating process, the electrode needs to be dried. The traditional method of drying the electrode is to heat the air and blow the wet electrode after coating by hot air convection. The water, NMP or other solvents in the coating slurry are heated and volatilized by heat conduction to achieve the purpose of drying the electrode. However, hot air drying is a heat conduction method with low energy utilization. The oven length of the coating machine on the market is basically more than 60m, which occupies a large space, has high energy consumption, is complex to maintain, and has problems such as incomplete or uneven drying, electrode wrinkles and cracking of the electrode coating.

[0003] In order to improve production efficiency and energy utilization, laser drying is generally used at present. The laser is used to directly heat the electrode, avoiding the energy loss caused by heat exchange in the traditional hot air drying process. At the same time, laser drying is faster than traditional hot air and infrared heating drying. In addition, the laser can directly penetrate the outer layer of the electrode slurry, allowing the inner layer of the slurry to dry first, avoiding the binder and conductive agent in the slurry from floating due to heat, causing the slurry to detach from the electrode surface.

[0004] However, as the laser drying speed increases, the volatilization rate of the solvent NMP in the electrode also greatly accelerates. NMP is a flammable, explosive and toxic solvent. In order to quickly extract the NMP gas volatilized in the oven, it is generally necessary to increase the exhaust speed of the oven. However, increasing the exhaust speed of the oven may cause the electrode to shake, resulting in poor consistency in the surface density of the electrode during drying, which can easily lead to cracking of the electrode after drying. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the utility model provides a laser drying oven and drying equipment, which can take away the NMP gas volatilized into the inside of the box, avoid explosion in the box, and improve the safety of the oven. Moreover, by making the flow direction of the parallel airflow consistent with the conveying direction of the electrode, it can avoid the shaking of the electrode and prevent the electrode from cracking after drying.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A laser drying oven comprises: a box body, with a feed port and a discharge port for accommodating electrode pieces on both sides; a laser heater arranged on the top of the box body, for heating the electrode pieces entering the box body; an air guide mechanism, comprising an air inlet assembly and an air outlet assembly, the air inlet assembly comprising an air inlet channel and a first enclosure, the first enclosure and one side of the box body enclosing an air inlet cavity, the air inlet channel being connected to the air inlet cavity, the air outlet assembly comprising an air outlet channel and a second enclosure, the second enclosure and the other side of the box body enclosing an air outlet cavity, the air outlet channel being connected to the air outlet cavity, a plurality of ventilation holes being provided on opposite sides of the first enclosure and the second enclosure, the air flow flows from the air inlet cavity to the air outlet cavity to form a parallel air flow, and the flow direction of the parallel air flow is consistent with the conveying direction of the electrode pieces.

[0008] As a further improvement of the above technical solution, the air inlet assembly further includes an air inlet guide plate, which is located in the air inlet cavity and is used to guide the airflow entering the air inlet cavity.

[0009] As a further improvement of the above technical solution, the air outlet assembly also includes an air outlet guide plate, which is located in the air outlet cavity. The air outlet guide plate is used to guide the air flow entering the air outlet cavity. The air inlet guide plate and the air outlet guide plate are symmetrically arranged along the center line of the box.

[0010] As a further improvement of the above technical solution, the air inlet guide plate includes two first partition plates, which divide the air inlet cavity into three air inlet areas arranged in sequence along the height direction. The density and aperture of the several ventilation holes on one side of the first enclosure corresponding to different air inlet areas are different.

[0011] As a further improvement of the above technical solution, the air inlet channel is arranged on the top of the box body, and the first partition plate has an L-shaped structure.

[0012] As a further improvement of the above technical solution, the air inlet guide plate also includes a number of second partition plates, which are perpendicular to the first partition plates. The second partition plates divide the air inlet cavity into a number of air inlet areas arranged in sequence along the width direction of the pole piece.

[0013] As a further improvement of the above technical solution, a plurality of rollers are provided in the box body, and the plurality of rollers are arranged in sequence along the conveying direction of the electrode piece, and the plurality of rollers are used to support the electrode piece.

[0014] As a further improvement of the above technical solution, a thermometer is further provided on the top of the box body, and the thermometer is used to detect the temperature of the electrode after heating.

[0015] As a further improvement of the above technical solution, the thermometer is an infrared temperature measuring camera.

[0016] A drying device comprises a plurality of the above-mentioned laser drying ovens, wherein the discharge port on one of the boxes of two adjacent laser drying ovens corresponds to the feed port on the other box.

[0017] The beneficial effects of the present invention are as follows: the present invention provides a laser drying oven and drying equipment, which forms a parallel airflow from the air inlet cavity to the air outlet cavity inside the box by arranging an air inlet component and an air outlet component. On the one hand, it can take away the NMP gas volatilized into the inside of the box, avoid explosion in the box, and improve the safety of the oven. On the other hand, it makes the flow direction of the parallel airflow consistent with the conveying direction of the electrode, thereby avoiding shaking of the electrode and preventing cracking of the electrode after drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a structural diagram of a drying device in one embodiment of the present utility model;

[0020] Figure 2 This is a schematic structural diagram of a laser drying oven in one embodiment of the present utility model;

[0021] Figure 3 yes Figure 2 Partial perspective drawing in;

[0022] Figure 4 yes Figure 2 Cross-sectional view in

[0023] Figure 5 yes Figure 2 A sectional view from another perspective;

[0024] Figure 6 yes Figure 3 Combination diagram of the first coaming and the air inlet guide plate;

[0025] Figure 7 yes Figure 6 A structural diagram from another perspective;

[0026] Figure 8 It is a schematic diagram of wind speed under normal tension state of the pole piece;

[0027] Figure 9 This is a schematic diagram of wind speed when the pole piece tension is large;

[0028] Figure 10 This is a schematic diagram of wind speed when the pole tension is small.

[0029] Figure markings: 1-box, 2-laser heater, 3-air inlet assembly, 4-air outlet assembly, 5-roller, 6-thermometer, 11-feed port, 12-outlet port, 31-air inlet channel, 32-first enclosure, 33-air inlet guide plate, 41-air outlet channel, 42-second enclosure, 43-air outlet guide plate, 321-ventilation hole, 331-first partition plate, 332-second partition plate. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0031] Reference Figures 2 to 5 An example of the present invention provides a laser drying oven, which includes an oven, a laser heater 2 arranged on the top of the oven, and an air guide mechanism arranged on the oven.

[0032] In order to facilitate the entry and exit of the electrode pieces into and out of the box body 1 , a feed port 11 and a discharge port 12 for accommodating the electrode pieces are respectively provided on both sides of the box body 1 .

[0033] Functionally, the laser heater 2 is used to heat the electrode entering the box 1 .

[0034] Structurally, the air guide mechanism includes an air inlet component 3 and an air outlet component 4. The air inlet component 3 includes an air inlet channel 31 and a first enclosure 32. The first enclosure 32 and one side of the box body 1 enclose an air inlet cavity, and the air inlet channel 31 is connected to the air inlet cavity. The air outlet component 4 includes an air outlet channel 41 and a second enclosure 42. The second enclosure 42 and the other side of the box body 1 enclose an air outlet cavity, and the air outlet channel 41 is connected to the air outlet cavity. Several ventilation holes 321 are provided on the opposite sides of the first enclosure 32 and the second enclosure 42. The air flow flows from the air inlet cavity to the air outlet cavity to form a parallel airflow, and the flow direction of the parallel airflow is consistent with the conveying direction of the electrode.

[0035] It can be understood that the laser heater 2 emits a laser and irradiates the electrode, causing the electrode to heat up rapidly, and the NMP gas generated by the heating of the electrode evaporates into the interior of the box 1. The external blowing device (not shown in the drawings) and the exhaust device (not shown in the drawings) blow and exhaust respectively through the air inlet component 3 and the air outlet component 4. Specifically, the air flow generated by the blowing device enters the air inlet cavity through the air inlet channel 31, and the air flow in the air inlet cavity enters the box 1 through the several ventilation holes 321 on one side of the first enclosure 32. At the same time, the exhaust The wind equipment provides negative pressure, and the gas in the box 1 enters the air outlet cavity through several ventilation holes 321 on one side of the second enclosure 42, and is then drawn out of the box 1 through the air outlet channel 41, so that a parallel airflow is formed inside the box 1 flowing from the air inlet cavity to the air outlet cavity. On the one hand, it can take away the NMP gas volatilized into the inside of the box 1, avoid explosion in the box 1, and improve the safety of the oven. On the other hand, the flow direction of the parallel airflow is consistent with the conveying direction of the electrode, thereby avoiding shaking of the electrode and preventing cracking of the electrode after drying.

[0036] In some preferred embodiments, the air inlet component 3 also includes an air inlet guide plate 33, which is located in the air inlet cavity. The air inlet guide plate 33 is used to guide the airflow entering the air inlet cavity. The air outlet component 4 also includes an air outlet guide plate 43, which is located in the air outlet cavity. The air outlet guide plate 43 is used to guide the airflow entering the air outlet cavity. The air inlet guide plate 33 and the air outlet guide plate 43 are symmetrically arranged along the center line of the box body 1.

[0037] It can be understood that after the air flow enters the air inlet cavity from the air inlet channel 31, the air flow in the air inlet cavity flows into the box body 1 along the conveying direction of the electrode through the air inlet guide plate 33. Then, the air flow in the box body 1 enters the air outlet cavity and is guided to the air outlet channel 41 through the air outlet guide plate 43, thereby ensuring that the air flow direction in the box body 1 is consistent with the conveying direction of the electrode, avoiding turbulence inside the box body 1, and improving the stability of the electrode.

[0038] Reference Figures 4 to 7 Furthermore, the air inlet guide plate 33 includes two first partition plates 331, and the two first partition plates 331 divide the air inlet cavity into three air inlet areas arranged in sequence along the height direction. The density and aperture of the plurality of ventilation holes 321 on one side of the first enclosing plate 32 corresponding to different air inlet areas are different. Accordingly, the density and aperture of the plurality of ventilation holes 321 on one side of the second enclosing plate 42 are set to correspond to the density and aperture of the plurality of ventilation holes 321 on one side of the first enclosing plate 32.

[0039] It can be understood that by setting different densities and apertures of the ventilation holes 321 in the corresponding areas on the first enclosure 32 and the second enclosure 42, the flow rate of the air flow inside the box 1 is different at different heights. Moreover, through the difference in flow rate, it can be ensured that when the vibration of the electrode is small, the NMP gas inside the box 1 can be removed in time, thereby avoiding the problem of continuous accumulation of NMP gas causing oven explosion.

[0040] It should be noted that the ventilation hole 321 can be a round hole, a square hole, a waist-shaped hole or a hole of other shapes, which is not limited in this embodiment.

[0041] Reference Figure 8 Specifically, under normal conditions, the bottom area of the box body 1 adopts medium wind speed exhaust, which can avoid the pole piece shaking caused by excessive wind speed, and at the same time, can quickly extract the NMP gas from the inside of the box body 1; the middle area of the box body 1 adopts high wind speed exhaust, which can avoid the dead corner of NMP gas accumulation; the top area of the box body 1 adopts low wind speed exhaust, which can avoid the overall air volume of the box body 1 being too large and causing energy loss.

[0042] Reference Figure 9 When the electrode tension is large enough, the increase in air volume is less likely to cause the electrode to shake. Therefore, high wind speed exhaust can be used in the bottom area of the box 1 to allow the NMP gas to be extracted from the inside of the box 1 as quickly as possible.

[0043] Reference Figure 10 When the pole piece tension is too small, the increase in air volume will cause the pole piece to vibrate more. Therefore, the bottom area of the box body 1 needs to be exhausted at a low wind speed to avoid large vibration of the pole piece.

[0044] It should be noted that the wind speed distribution in different areas inside the box 1 of the embodiment of the present invention includes but is not limited to the above implementation methods.

[0045] In some preferred embodiments, the air inlet channel 31 is arranged at the top of the box body 1, and the first partition plate 331 presents an L-shaped structure. Accordingly, the air outlet channel 41 is arranged at the top of the box body 1, thereby making full use of the space at the top of the box body 1, reducing the occupied area of the box body 1, and improving space utilization.

[0046] When blowing, the air flow enters from the top of the air inlet cavity, flows to the corresponding area in the vertical direction, and then flows out along the conveying direction of the electrode; when exhausting, the air flow in the box 1 enters the air outlet cavity along the conveying direction of the electrode, and then flows vertically to the air outlet channel 41 at the top of the air outlet cavity, thereby further ensuring that the air flow in the box 1 can flow along the conveying direction of the electrode.

[0047] Furthermore, the air inlet guide plate 33 also includes a number of second partition plates 332, and the number of second partition plates 332 are perpendicular to the first partition plate 331. The number of second partition plates 332 divides the air inlet cavity into a number of air inlet areas arranged in sequence along the width direction of the electrode, so that the airflow entering the air inlet cavity can be evenly distributed along the width direction of the electrode, thereby ensuring that the wind speed of the airflow in the box body 1 in each area in the width direction of the electrode remains consistent, and further, can reduce the shaking of the electrode during the drying process, and avoid cracking of the electrode after drying.

[0048] In some preferred embodiments, a plurality of rollers 5 are provided in the box body 1, and the plurality of rollers 5 are arranged in sequence along the conveying direction of the electrode piece. The plurality of rollers 5 are used to support the electrode piece, so that the electrode piece can maintain tension during the conveying process, and further, it can be ensured that the electrode piece is conveyed on the same horizontal plane, ensuring that the airflow in the box body 1 is consistent with the conveying direction of the electrode piece.

[0049] In order to facilitate monitoring of the drying process of the electrode, a thermometer 6 is further provided on the top of the box 1. The thermometer 6 is used to detect the temperature of the electrode after heating.

[0050] Specifically, the thermometer 6 is an infrared temperature measuring camera, which can realize non-contact temperature detection in a specific area to ensure the accuracy of the electrode heating temperature.

[0051] Furthermore, the laser heater 2 is located at the center of the top of the box 1, and there are two thermometers 6, which are located on both sides of the laser heater 2, respectively, and can fully detect the heating temperature of the electrode to avoid blind spots in detection.

[0052] Reference Figure 1 An embodiment of the present invention also provides a drying device, including several of the above-mentioned laser drying ovens. Specifically, the discharge port 12 on one of the boxes 1 in two adjacent laser drying ovens corresponds to the feed port 11 on the other box 1, which is convenient for controlling the heating temperature of the electrode at different stages and improving the drying quality of the electrode.

[0053] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A laser drying oven, characterized in that: include: The box body has a feed port and a discharge port on both sides for accommodating the passage of the electrode pieces; A laser heater is provided on the top of the box body and is used to heat the electrode piece entering the box body; The air guiding mechanism includes an air inlet assembly and an air outlet assembly, the air inlet assembly includes an air inlet channel and a first enclosure, the first enclosure and one side of the box body enclose an air inlet cavity, the air inlet channel is connected to the air inlet cavity, the air outlet assembly includes an air outlet channel and a second enclosure, the second enclosure and the other side of the box body enclose an air outlet cavity, the air outlet channel is connected to the air outlet cavity, a plurality of ventilation holes are provided on opposite sides of the first enclosure and the second enclosure, the air flow flows from the air inlet cavity to the air outlet cavity to form a parallel airflow, and the flow direction of the parallel airflow is consistent with the conveying direction of the electrode.

2. A laser drying oven according to claim 1, characterized in that: The air inlet assembly further includes an air inlet guide plate, which is located in the air inlet cavity and is used to guide the airflow entering the air inlet cavity.

3. The laser drying oven according to claim 2, characterized in that: The air outlet assembly also includes an air outlet guide plate, which is located in the air outlet cavity and is used to guide the air flow entering the air outlet cavity. The air inlet guide plate and the air outlet guide plate are symmetrically arranged along the center line of the box.

4. The laser drying oven according to claim 2, characterized in that: The air inlet guide plate includes two first partition plates, which divide the air inlet cavity into three air inlet areas arranged in sequence along the height direction. The density and aperture of the multiple ventilation holes on one side of the first enclosure corresponding to different air inlet areas are different.

5. The laser drying oven according to claim 4, characterized in that: The air inlet channel is arranged on the top of the box body, and the first partition plate presents an L-shaped structure.

6. The laser drying oven according to claim 4, characterized in that: The air inlet guide plate further includes a plurality of second partition plates, which are perpendicular to the first partition plates and divide the air inlet cavity into a plurality of air inlet areas sequentially arranged along the width direction of the pole piece.

7. The laser drying oven according to claim 1, characterized in that: A plurality of rollers are arranged in the box body, and the plurality of rollers are arranged in sequence along the conveying direction of the electrode piece, and the plurality of rollers are used to support the electrode piece.

8. The laser drying oven according to claim 1, characterized in that: A thermometer is also provided on the top of the box body, and the thermometer is used to detect the temperature of the electrode after heating.

9. The laser drying oven according to claim 8, characterized in that: The thermometer is an infrared temperature measuring camera.

10. A drying device, characterized in that: The laser drying oven comprises any one of claims 1 to 9, wherein the discharge port on one of the boxes of two adjacent laser drying ovens corresponds to the feed port on the other box.

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