Pole piece oven

Abstract

The utility model provides a pole piece oven, which is used for heating a pole piece and comprises an oven body, a heating device, a heating device and a heating device, a cavity is arranged in the oven body, and the cavity is used for accommodating the pole piece; the hot air device comprises an air outlet, the air outlet is formed in the cavity and used for allowing hot air to flow out, and the hot air device is used for conveying the hot air to the cavity; the infrared irradiation device comprises an infrared light source and a lampshade, the infrared light source is fixed in the lampshade, light emitted by the infrared light source can penetrate through the lampshade and irradiate on the pole piece, a through hole and a cold air opening are formed in the lampshade, the through hole is communicated with the interior of the lampshade and the cavity, and the cold air opening is communicated with the cavity. The cold air opening is communicated with the interior of the lampshade and the exterior of the box body and blows air outside the box body into the lampshade. The pole piece heating device can solve the problem that pole pieces are heated unevenly.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a pole piece oven. Background Art

[0002] In the existing production technology, the manufacturing process of lithium battery pole pieces involves two processes: pole piece drying and rolling. In the coating process, the pole piece is dried to evaporate the solvent in the slurry. In the rolling process, the pole piece is rolled under great pressure to achieve a compaction density that meets the process requirements. After rolling, the pole piece will have a part of its thickness rebound, and the rebound of the pole piece is suppressed by rapid heating and rapid cooling. However, whether it is the coating process or the rolling process, the way to heat the pole piece is to heat the pole piece by hot air, heat the air medium, and dry the pole piece from the surface to the inside. The infrared heating method does not require medium transmission, but emits infrared rays of a certain wavelength through infrared lamps to heat the pole piece from the inside to the outside. The heating efficiency and temperature are much higher than hot air heating. When the pole piece is heated under the joint action of hot air and infrared heating, although the inside and outside of the pole piece are heated at the same time, due to the temperature of the hot air and the temperature emitted by the infrared heating itself, the metal coating on the surface of the lamp body evaporates in a high temperature environment, and the emission of infrared rays will be reduced. As a result, different infrared lamps have different irradiation intensities, causing uneven heating of the electrode. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a pole piece oven, which can solve the problem of uneven heating of the pole piece.

[0004] The electrode oven according to the embodiment of the utility model is used to heat the electrode, and the electrode oven includes: a box body, a chamber is arranged in the box body, and the chamber is used to accommodate the electrode; a hot air device, including an air outlet, the air outlet is arranged in the chamber and used to let the hot air flow out, and the hot air device is used to convey hot air to the chamber; an infrared irradiation device, located in the chamber, the infrared irradiation device includes an infrared light source and a lampshade, the infrared light source is fixed inside the lampshade, the light emitted by the infrared light source can pass through the lampshade and irradiate the electrode, and the lampshade is provided with a through hole and a cold air outlet; a cold air device, the cold air device is connected to the infrared irradiation device, the cold air device is used to convey cold air to the cold air outlet, the temperature of the cold air is lower than the temperature of the hot air, and the through hole is used to let the cold air leave the lampshade.

[0005] The pole piece oven according to the embodiment of the utility model has at least the following beneficial effects: the hot air device heats the pole piece while the infrared irradiation device is used to irradiate and heat the pole piece, the hot air device heats the pole piece from the outside to the inside, and the infrared irradiation device heats the pole piece from the inside to the outside, so that the pole piece is heated faster and the heating is more uniform. And by cooling the lampshade, the lampshade on the infrared irradiation device is prevented from being damaged by the high temperature environment. Since the hot air device and the infrared irradiation device heat the pole piece at the same time, the temperature in the box will rise, thereby damaging the metal coating on the lampshade, so that the infrared irradiation device cannot stably irradiate infrared rays, resulting in uneven heating of the pole piece by the infrared irradiation device. And by blowing cooling air to the infrared light source and the lampshade through the cold air outlet, the infrared light source and the lampshade are cooled, thereby protecting the lampshade, so that the infrared irradiation device can still stably release infrared light when heating the pole piece, so that the pole piece is evenly heated.

[0006] According to some embodiments of the present invention, a negative pressure port and an exhaust fan are further included, wherein the negative pressure port is connected to the chamber and the outside of the box body, and the exhaust fan extracts the gas in the chamber through the negative pressure port to form a negative pressure in the chamber.

[0007] According to some embodiments of the utility model, the hot air device also includes a wind cavity, a heating mechanism and an air inlet, the wind cavity is arranged in the chamber, the air inlet connects the wind cavity and the outside of the box and blows the gas outside the box into the wind cavity, the air outlet connects the wind cavity and the chamber and blows the gas in the wind cavity into the chamber, and the heating mechanism is arranged in the wind cavity and heats the gas in the wind cavity.

[0008] According to some embodiments of the present invention, a conveying device is provided in the chamber, and the conveying device is used to convey the pole piece and move the pole piece along a conveying path relative to the chamber.

[0009] According to some embodiments of the utility model, a feed port and a discharge port are provided on the box body, and the pole piece enters the chamber from the feed port and is conveyed from the discharge port to the outside of the box body by the conveying device along the conveying path.

[0010] According to some embodiments of the present invention, a plurality of the infrared irradiation devices are arranged along the conveying path, and at least one infrared irradiation device is provided on each side of the conveying path.

[0011] According to some embodiments of the utility model, a plurality of air outlets are provided on the air cavity, and the air outlets blow the hot air to different positions on the pole piece.

[0012] According to some embodiments of the utility model, the infrared irradiation device also includes a movable frame, the lampshade is installed on the movable frame, and the movable frame is slidably connected to the inner wall of the box to adjust the distance between the lampshade and the pole piece.

[0013] According to some embodiments of the utility model, two hot air devices are provided, one of which is arranged at the top of the chamber and blows air downward, and the other of which is arranged at the bottom of the chamber and blows air upward, and the pole piece is arranged between the air outlets of the two hot air devices.

[0014] According to some embodiments of the present utility model, the hot air device further comprises an air return port, wherein the air return port connects the air cavity and the chamber and blows the gas in the chamber into the air cavity.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 It is a cross-sectional schematic diagram of the pole piece oven of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the conveying device of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the infrared irradiation device of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure inside the pole piece oven of the utility model.

[0021] Reference numerals:

[0022] 1. Box body; 11. Chamber; 12. Feed inlet; 13. Discharge outlet; 14. Negative pressure outlet; 2. Hot air device; 21. Air inlet; 22. Air outlet; 23. Return air outlet; 24. Air cavity; 3. Infrared irradiation device; 31. Lamp cover; 32. Cold air outlet; 33. Infrared light source; 4. Pole piece; 5. Conveying device. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] In the prior art, when the hot air device 2 is used to heat the electrode 4, the electrode 4 is heated from the outside to the inside, and during the heating process, the electrode 4 may crack and powder. When the infrared irradiation device 3 is used to irradiate and heat the electrode 4, the electrode 4 is heated from the inside to the outside, and the heating speed is slow. When the hot air device 2 and the infrared irradiation device 3 are used to heat the electrode 4 at the same time, the electrode 4 can be heated quickly. However, when the hot air device 2 and the infrared irradiation device 3 are used to heat the electrode 4 at the same time, the working environment of the infrared irradiation device 3 will be greatly improved, causing the metal coating of the lampshade 31 on the infrared irradiation device 3 to volatilize, resulting in the infrared irradiation device 3 being unable to stably emit infrared light and unable to stably and evenly heat the electrode 4. Among them, the metal coating can be an iron-chromium-aluminum alloy, and it can also be other infrared coatings. The metal coating will volatilize at 600-700°C. Although the hot air in the box may not reach such a high temperature, the hot air environment in the box will greatly affect the heat dissipation of the infrared irradiation device 3, causing the temperature of the infrared irradiation device 3 to rise sharply, thereby reaching a temperature that causes the metal coating to volatilize.

[0028] Reference Figure 1-Figure 4The pole piece oven of one embodiment of the utility model is used to heat the pole piece 4, and the pole piece oven comprises: a box body 1, a chamber 11 is arranged in the box body 1, and the pole piece 4 is arranged in the chamber 11; a hot air device 2, comprising an air inlet 21, an air outlet 22, an air cavity 24 and a heating mechanism, the air inlet 21 connects the ventilation cavity 24 and the outside of the box body 1 and blows the gas outside the box body 1 into the air cavity 24, the air inlet 21 connects the ventilation cavity 24 and the chamber 11 and blows the gas in the air cavity 24 into the chamber 11, and the heating mechanism is arranged in the air cavity 24 and heats the gas in the air cavity 24. The pole piece 4 is placed into the chamber 11 in the box body 1, and the air inlet 21 blows the normal temperature gas outside the box body 1 into the air cavity 24, and a valve can be arranged on the air inlet 21 to adjust the air volume blown into the air cavity 24 by the air inlet 21. After the air inlet 21 blows the normal temperature gas into the air cavity 24, the heating mechanism in the air cavity 24 heats the gas in the air cavity 24, and then blows the heated gas into the chamber 11 through the air outlet 22 to heat the electrode 4 in the chamber 11. The heating mechanism can be a resistance heating pack. After the resistance heating pack is powered on, the resistance wire in the resistance heating pack heats up, thereby heating the gas in the air cavity 24. The hot air blown out of the air outlet 22 in the hot air device 2 can be the normal temperature air outside the box 1 entering from the air inlet, or it can directly heat the gas in the chamber 11 and then blow it out. At the same time, the two can also be combined, and the hot air blown out of the air outlet 22 comes from both outside the box 1 and inside the box 1.

[0029] The infrared irradiation device 3 includes an infrared light source 33, a lampshade 31, a through hole and a cold air outlet 32. The infrared light source 33 is arranged inside the lampshade 31, and the infrared light source 33 irradiates the pole piece 4 through the lampshade 31. The through hole is arranged inside the lampshade 31 and connects the inside of the lampshade 31 and the chamber 11. The cold air outlet 32 ​​connects the inside of the lampshade 31 and the outside of the box 1 and blows the gas outside the box 1 into the inside of the lampshade 31. The infrared light source 33 emits light, and after passing through the lampshade 31, it irradiates the pole piece 4 in the chamber 11 to heat the pole piece 4. The cold air outlet 32 ​​blows the normal temperature gas outside the box 1 or the cooled low temperature gas into the inside of the lampshade 31 to cool the lampshade 31 and the infrared light source 33, so as to prevent the metal coating on the lampshade 31 or the infrared light source 33 from volatilizing in a high temperature environment, thereby preventing the infrared irradiation device 3 from failing, so that the infrared irradiation device 3 can continuously and stably heat the pole piece 4 uniformly. After the cold air outlet 32 ​​blows gas into the lampshade 31 to cool down the lampshade 31 and the infrared light source 33, the gas with increased temperature enters the chamber 11 from the through hole on the lampshade 31, so that the cold air outlet 32 ​​can continuously blow gas into the lampshade 31 to cool the lampshade 31 and the infrared light source 33.

[0030] Furthermore, a temperature sensor may be provided to detect the temperature on the pole piece 4, and a power control device may be provided to control the power of the infrared irradiation device 3, wherein the power control device includes a PLC circuit control board and a power regulator, the PLC circuit control board is electrically connected to the temperature sensor and the power regulator, and the PLC circuit control board adjusts the irradiation power of the infrared irradiation device 3 by controlling the power regulator. Specifically, the temperature of the pole piece 4 is detected by the temperature sensor, and when it is detected that the temperature on the pole piece 4 is too high, the PLC circuit control board reduces the power of the infrared irradiation device 3 by controlling the power regulator, so that the temperature on the pole piece 4 returns to the set temperature. Similarly, when the temperature sensor detects that the temperature on the pole piece 4 is lower than the set temperature, the temperature sensor transmits an electrical signal to the PLC circuit control board, thereby controlling the power regulation device to increase the power of the infrared irradiation device 3.

[0031] Furthermore, a temperature sensor may be provided on the lampshade 31. When the temperature on the lampshade 31 is high, the air volume of the gas blown into the lampshade 31 may be increased through the control device, thereby preventing the temperature of the lampshade 31 from being too high. Specifically, the fan on the cold air outlet 32 ​​is controlled, and the air volume blown into the lampshade 31 is controlled by controlling the power of the fan. When multiple lampshades 31 are provided, multiple fans and lampshades 31 may be used in a one-to-one correspondence, so that the air volume into the lampshade 31 may be accurately controlled. At the same time, an air volume valve may be provided to control the air volume entering each lampshade 31.

[0032] The electrode oven also includes a negative pressure port 14, which connects the chamber 11 and the outside of the box 1. The exhaust fan draws out the gas in the chamber 11 through the negative pressure port 14 and forms a negative pressure in the chamber 11. Negative pressure means that the air pressure inside the box is less than the air pressure outside the box, and the air pressure outside the box is usually atmospheric pressure. The gas temperature in the chamber 11 is relatively high. If the gas in the chamber 11 is allowed to leak from the box 1 into the workshop, the temperature in the workshop will increase greatly, causing discomfort to the staff. Therefore, the gas in the chamber 11 is drawn out through the negative pressure port 14 and discharged to the outside of the workshop, so that a negative pressure is formed in the chamber 11 to prevent the gas leakage in the electrode oven from increasing the temperature in the workshop.

[0033] The air inlet 21 and the cold air outlet 32 ​​are both provided with a gas filter, which can be specifically provided as a filter element for filtering gas. The air inlet 21 and the cold air outlet 32 ​​both blow the gas outside the box 1 into the box 1. In order to ensure the cleanliness of the box 1 and the pole piece 4 in the box 1 is not contaminated, the gas needs to be filtered before entering the box 1 to filter out impurities in the gas. Therefore, the air inlet 21 and the cold air outlet 32 ​​are both provided with a gas filter to filter the air entering the box 1.

[0034] The chamber 11 is provided with a conveying device 5, which is used to convey the electrode piece 4 and convey the electrode piece 4 along the conveying path. The conveying device 5 is provided, so that the electrode piece 4 can be heated while being automatically conveyed into the chamber 11, and the heated electrode piece 4 can be conveyed out of the chamber 11. The specific conveying device 5 includes a plurality of conveying rollers, and the conveying rollers convey the electrode piece 4 along the conveying path by rotating. Through the curved conveying path, more electrode pieces 4 can be heated simultaneously in the chamber 11, which improves the heating efficiency and reduces the energy consumption.

[0035] The box body 1 is provided with a feed port 12 and a discharge port 13. The pole piece 4 enters the chamber 11 from the feed port 12 and is conveyed to the outside of the box body 1 from the discharge port 13 by the conveying device 5 along the conveying path. The pole piece 4 is heated after entering the chamber 11 from the feed port 12. The pole piece 4 is heated during the conveying process along the conveying path, and leaves the chamber 11 through the discharge port 13 after the heating is completed. Further, a protective cover can be provided at the feed port 12 and the discharge port 13. The protective cover cover is provided on the feed port 12 and the discharge port 13. The wound pole piece 4 is provided in the protective cover and the pole piece 4 is released to enter through the feed port 12. A rotating roller is provided in the protective cover on the discharge port 13, and the heated pole piece 4 is wound on the rotating roller for storage. That is, space is saved, and the contamination of the pole piece 4 caused by the negative pressure debris in the chamber 11 entering the chamber 11 from the feed port 12 or the discharge port 13 is avoided.

[0036] A plurality of infrared irradiation devices 3 are arranged on both sides of the conveying path. Specifically, the infrared irradiation devices 3 are arranged on both sides of the conveying path at a certain interval, and irradiate and heat both sides of the pole piece 4 at the same time, thereby improving the heating efficiency of the pole piece 4.

[0037] The air cavity is provided with a plurality of air outlets 22, and the air outlets 22 blow the gas in the air cavity 24 toward the pole piece 4. A single air outlet 22 will make the temperature in the chamber 11 not uniform enough, so the temperature in the chamber 11 is more uniform by ventilating at multiple positions in the chamber 11 through multiple air outlets 22, so that the heating of the pole piece 4 is more uniform. The multiple air outlets 22 blow air to different positions on the pole piece 4, so that the heating of the pole piece 4 is more uniform, and the blowing force on the pole piece is reduced while ensuring the air volume of the air outlet 22.

[0038] The infrared irradiation device 3 also includes a moving frame, a lampshade 31 is mounted on the moving frame, and the moving frame is slidably connected to the inner wall of the box body 1. The distance between the infrared irradiation device 3 and the pole piece 4 is adjusted by sliding the moving frame on the inner wall of the box body 1 to adjust the irradiation intensity of the infrared irradiation device 3 on the pole piece 4. After adjusting to a suitable intensity, the moving frame is fixed to the inner wall of the box body 1. That is, a fastening device is provided, and after the moving frame adjusts the distance between the lampshade 31 and the pole piece 4, the moving frame is fixed to the box body through the fastening device. The specific fastening device can use bolts and nuts to fix the moving frame.

[0039] The electrode oven includes two hot air devices 2, one hot air device 2 is arranged at the top of the chamber 11 and blows air downward, and the other hot air device 2 is arranged at the bottom of the chamber 11 and blows air upward. Specifically, the discharge port 13 is arranged on the left side, and the feed port 12 is arranged on the right side. When the electrode 4 is transported on the conveying path, if there is only one bottom hot air device 2, the heating of both sides of the electrode 4 may not be uniform. Therefore, two hot air devices 2 are arranged at the top and bottom of the chamber 11 to blow hot air into the chamber 11 at the same time, so that the heating of the electrode 4 is more uniform. At the same time, a hot air device 2 can also be arranged, and the air outlet 22 is divided into an upper blowing port and a lower blowing port, which can also make the heating of both sides of the electrode 4 more uniform.

[0040] The hot air device 2 also includes a return air port 23, which connects the ventilation cavity 24 and the chamber 11 and blows the gas in the chamber 11 into the air cavity 24. The return air port 23 blows the gas in the chamber 11 back into the air cavity 24 for heating, forming an internal circulation, which not only saves energy, but also forms an internal circulation to make the fluidity of the gas in the chamber 11 better and the heating of the pole piece 4 more uniform. The preferred ratio of the air volume blown into the air cavity 24 by the return air port 23 to the air volume blown into the air cavity 24 by the air inlet 21 is 7:3. This ratio can ensure the fluidity and temperature of the gas in the chamber 11 while maintaining negative pressure.

[0041] When blowing air, the air inlet 21, air outlet 22 and return air outlet 23 in the hot air device 2 can all be achieved by using a fan. At the same time, regulating air valves can be set at the positions of the air inlet 21, air outlet 22 and return air outlet 23 to adjust the air volume. For example, a fan and an regulating air valve are set at the air inlet 21, and the normal temperature air outside the box 1 is blown into the air cavity 24 from the air inlet 21 by the fan, and the air volume entering the air cavity 24 through the air inlet 21 is adjusted by adjusting the air valve.

[0042] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. Pole oven, characterized in that: Used to heat the pole piece, the pole piece oven comprises: A box body, wherein a chamber is provided in the box body, and the chamber is used to accommodate the pole piece; A hot air device, comprising an air outlet, the air outlet being arranged in the chamber and used for letting hot air flow out, the hot air device being used for delivering hot air to the chamber; An infrared irradiation device is located in the chamber, and includes an infrared light source and a lampshade. The infrared light source is fixed inside the lampshade, and the light emitted by the infrared light source can pass through the lampshade and irradiate the pole piece. The lampshade is provided with a through hole and a cold air outlet; A cold air device is connected to the infrared irradiation device, and is used to deliver cold air to the cold air outlet, wherein the temperature of the cold air is lower than the temperature of the hot air, and the through hole is used to allow the cold air to leave the lampshade.

2. The pole piece oven according to claim 1, characterized in that: It also includes a negative pressure port and an exhaust fan, wherein the negative pressure port is connected to the chamber and the outside of the box body, and the exhaust fan extracts the gas in the chamber through the negative pressure port to form a negative pressure in the chamber.

3. The pole piece oven according to claim 1, characterized in that: The hot air device also includes a wind cavity, a heating mechanism and an air inlet, wherein the wind cavity is arranged in the chamber, the air inlet connects the wind cavity and the outside of the box body and blows the gas outside the box body into the wind cavity, the air outlet connects the wind cavity and the chamber and blows the gas in the wind cavity into the chamber, and the heating mechanism is arranged in the wind cavity and heats the gas in the wind cavity.

4. The pole piece oven according to claim 1, characterized in that: A conveying device is arranged in the chamber, and is used for conveying the pole piece and moving the pole piece relative to the chamber along a conveying path.

5. The pole piece oven according to claim 4, characterized in that: The box body is provided with a feed port and a discharge port. The pole piece enters the chamber from the feed port and is transported from the discharge port to the outside of the box body by the transport device along the transport path.

6. The pole piece oven according to claim 4, characterized in that: A plurality of the infrared irradiation devices are arranged along the conveying path, and at least one infrared irradiation device is arranged on each side of the conveying path.

7. The pole piece oven according to claim 3, characterized in that: The wind cavity is provided with a plurality of air outlets, and the air outlets blow the hot air to different positions on the pole piece.

8. The pole piece oven according to claim 1, characterized in that: The infrared irradiation device also includes a moving frame, the lampshade is mounted on the moving frame, and the moving frame is slidably connected to the inner wall of the box body to adjust the distance between the lampshade and the pole piece.

9. The pole piece oven according to claim 1, characterized in that: There are two hot air devices, one of which is arranged at the top of the chamber and blows air downwards, and the other is arranged at the bottom of the chamber and blows air upwards, and the pole piece is arranged between the air outlets of the two hot air devices.

10. The pole piece oven according to claim 3, characterized in that: The hot air device also includes an air return port, which communicates with the air cavity and the chamber and blows the gas in the chamber into the air cavity.

Images