Lampblack adsorption device for lithium battery diaphragm casting die head

Abstract

The invention discloses a lithium battery diaphragm casting die head oil smoke adsorption device which comprises a front oil smoke cover and a rear oil smoke pipe which are arranged on the front side and the rear side of the lower portion of a die head respectively, at least one smoke inlet is formed in the side, close to a die head lip, of the rear oil smoke pipe, and the bottom of the rear oil smoke pipe is connected with an oil guide opening. The front oil smoke cover comprises a top face, a bottom face and a front side face which define a triangular structure, the top face is an inclined face with the same angle as the inclined face below the front side of the die head, the bottom face is an inclined face gradually inclining downwards in the direction from the position close to a die head lip to the position away from the die head lip, and at least one air draft groove is formed in each of the bottom face and the top face. The air draft grooves are each of a long-strip-shaped structure extending leftwards and rightwards, a negative pressure pipe connector is arranged on the front oil smoke cover, and negative pressure fans are connected to the negative pressure pipe connector and the rear oil smoke pipe through pipelines. Oil fume is adsorbed to the front oil fume cover and the rear oil fume pipe through the negative pressure fan and then discharged outwards, and oil fume generated by the die head is reduced.

Description

Technical Field

[0001] This invention relates to an oil fume adsorption device for a lithium battery separator casting die, belonging to the technical field of lithium battery separator production equipment. Background Technology

[0002] Casting is a crucial step in lithium-ion battery separator production, and the die-casting equipment is of paramount importance within this process. Currently, during normal production, the die-casting equipment generates a large amount of paraffin oil fumes at the die lip due to high temperatures. These fumes rise and float in the casting room, affecting both the cleanliness of the room and adhering to the top of the die, forming oil deposits over time. These oil deposits condense and drip onto the membrane surface, causing thin spots and defects. Furthermore, the persistent oil deposits on the die, which is maintained at approximately 200°C during normal production, lead to carbon buildup. This carbon deposit also falls onto the membrane surface, causing defects. Therefore, during normal production, workers need to wipe away the oil deposits on the die regularly. Solving the problem of fumes from the die is therefore crucial for improving the A-grade yield of separators, increasing work efficiency, and saving manpower. However, existing equipment for adsorbing fumes from the casting die cannot solve these technical problems. Summary of the Invention

[0003] The purpose of this invention is to provide a lithium battery separator casting mold oil fume adsorption device that can adsorb oil fumes from the casting mold, so as to solve the problem of oil fume from the mold and improve the A-grade yield of the separator.

[0004] The present invention adopts the following technical solution: a fume adsorption device for a lithium battery separator casting die head, comprising a front fume hood and a rear fume pipe respectively disposed on the front and rear sides below the die head. The rear fume pipe has at least one fume inlet on the side near the die head lip, and an oil guide port is connected to the bottom of the rear fume pipe. The front fume hood includes a top surface, a bottom surface, and a front side surface forming a triangular structure. The bottom surface of the front fume hood is an inclined surface that gradually slopes downward from near the die head lip to away from the die head lip. At least one exhaust groove is provided on both the bottom surface and the top surface. The front fume hood is provided with a negative pressure pipe interface, and both the negative pressure pipe interface and the rear fume pipe are connected to a negative pressure fan.

[0005] An oil-collecting mechanism is provided below the front fume hood. The top surface of the front fume hood is an inclined surface that slopes in the same direction as the lower front side of the mold head. The angle of inclination can be the same as or different from the angle of inclination of the lower front side of the mold head. The exhaust duct adopts a long strip structure that extends horizontally or vertically. The negative pressure pipe interface provided on the front fume hood can be connected to a negative pressure fan through a pipe. The rear fume hood can be connected to a negative pressure fan through a pipe. An oil-collecting device can be provided below the front fume hood.

[0006] The lithium battery separator casting die head oil fume adsorption device also includes an oil collection box connected to a negative pressure fan. The oil collection box is provided with at least one air inlet and at least one air outlet, and the air outlet of the negative pressure fan is connected to the air inlet of the oil collection box.

[0007] There are two negative pressure fans, and the air inlet ports of the two negative pressure fans are respectively connected to a first tee and a second tee. The front fume hood has two negative pressure pipe interfaces, which are respectively located on the left and right sides of the front fume hood and are respectively connected to the first tee. The rear fume hood adopts a tubular structure with open ends, and the two ends of the rear fume hood are respectively connected to the second tee. The oil collection box has two air inlets, and the air outlet ports of the two negative pressure fans are respectively connected to the two air inlets of the oil collection box. The oil collection box has an opening at the bottom and an oil receiving box at the bottom of the oil collection box.

[0008] The negative pressure fan is a turbine fan, and the negative pressure fan is connected to the negative pressure pipe interface and the negative pressure fan is connected to the rear fume duct via steel wire hoses.

[0009] The angle between the bottom surface of the front fume hood and the horizontal plane is 10°-20°.

[0010] The number of exhaust ducts on the bottom and top surfaces of the front fume hood is between 2 and 20, and the exhaust ducts are arranged in parallel.

[0011] The number of exhaust vents on the bottom surface of the front fume hood is greater than the number of exhaust vents on the top surface.

[0012] The left and right ends of the rear exhaust pipe are respectively equipped with fixing clips. One end of each fixing clip clamps the end of the rear exhaust pipe, and the other end of each fixing clip is connected to the mold head through a rotating shaft.

[0013] The smoke inlet is a long groove extending along the axial direction of the rear fume duct.

[0014] The beneficial effects of this invention are as follows: This invention uses a negative pressure fan to draw air from the front fume hood and the rear fume duct, creating a negative pressure inside the front fume hood and the rear fume duct. Fumes from the front of the die head are drawn into the front fume hood through the upper and lower suction slots, while fumes from the rear of the die head are drawn into the rear fume duct through the smoke inlet. Therefore, fumes generated on both sides of the die head are drawn away by the front fume hood and the rear fume duct, respectively. Fumes drawn into the front fume hood are discharged through the negative pressure pipe interface, and fumes drawn into the rear fume duct are discharged from both ends. Oil droplets form in the rear fume duct and the front fume hood. Oil droplets in the rear fume duct are discharged through the oil guide pipe, and oil droplets in the front fume hood are discharged through the suction slot on the bottom and fall onto the oil collection tray. This invention utilizes a negative pressure fan to create negative pressure in the front fume hood and the rear fume duct, drawing fumes into the device for discharge, thus reducing the fumes generated by the die head. This reduces oil accumulation points caused by oil fumes adhering to the die head, thus reducing the formation of thin spots. Similarly, it also reduces carbon buildup on the die head. Therefore, this invention reduces oil fume generation on the die head, thereby reducing oil accumulation points and carbon buildup, and improving the cleanliness of the casting room.

[0015] In practical use, this invention effectively absorbs and removes most of the oil fumes, thereby reducing their generation. With this oil fume absorption device added to the die head, the front oil fume hood and rear oil fume pipe are located on the front and rear sides of the die head, respectively. This does not obstruct the process personnel's observation of the molten lip morphology and allows for observation of the adhesion between the molten lip and the subsequent cooling rollers. This prevents poor adhesion from going undetected, which could lead to defects such as uneven thickness and large thin spots. Furthermore, the bottom surface of the front oil fume hood is at an angle. After the oil fumes from the die head adhere to the bottom of the front oil fume hood and form oil accumulation points, the oil droplets will flow down the bottom surface of the front oil fume hood to the lowest point due to gravity and fall into the oil collection tray, preventing them from falling onto the film and causing defects. Secondly, the temperature of the melt at the die lip has a significant impact on the physical properties of the die. When adsorbing oil fumes, it is not possible to adsorb them directly onto the die lip. Therefore, when the front fume hood of this invention adsorbs oil fumes, it does so through the exhaust slots on the top and bottom of the front fume hood. The exhaust slots on the top and bottom surfaces of the front fume hood are straight slots, which do not directly adsorb onto the die lip and have no impact on the temperature of the die lip. This allows for better adsorption of oil fumes without affecting the performance of the diaphragm and prevents the die from cooling down too quickly. Although this sacrifices some oil fume adsorption effect, it controls the stability of the die temperature and therefore does not affect the performance of the diaphragm.

[0016] Preferably, the fumes drawn in by the front fume hood and the rear fume duct enter the oil collection tank, and the air outlet of the oil collection tank can be connected to a pipe to discharge the fumes to a professional fume purification and treatment device outside the room, where the liquid droplets in the fumes are separated and discharged.

[0017] Preferably, the front fume hood and the rear fume duct can be controlled separately by two negative pressure fans.

[0018] Preferably, the oil droplets formed in the oil collection tank can drip directly into the oil receiving box below.

[0019] Preferably, since the angle between the bottom surface of the front fume hood and the horizontal plane is within 10°-20°, it will not affect the temperature of the molten mold lip when absorbing fumes.

[0020] Preferably, since there is more oil fumes below the front fume hood, the number of exhaust vents on the bottom surface of the front fume hood is greater than the number of exhaust vents on the top surface.

[0021] Preferably, the rear fume duct is provided with fixing clips at both ends. The purpose of these clips is to adjust the angle at which the rear fume duct absorbs fumes, thereby maximizing the absorption of fumes. Additionally, the position of the rear fume duct can be adjusted according to the movement of the cooling roller. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an oil fume adsorption device for a lithium battery separator casting die head according to an embodiment of the present invention (connecting pipes are omitted in the figure). Figure 2 yes Figure 1 A plan view showing the front and rear fume hoods distributed on both sides of the mold head; Figure 3 yes Figure 2 A diagram from another angle; Figure 4 yes Figure 1 A schematic diagram of the front and middle fume hood; Figure 5 yes Figure 1 A schematic diagram of the front and middle fume hood from another angle; Figure 6 yes Figure 1 A schematic diagram of CIMC's fuel tank.

[0023] In the diagram: 1-Front fume hood, 1.1-Top surface, 1.2-Bottom surface, 1.3-Front side surface, 1.4-Exhaust duct, 1.5-Negative pressure pipe interface, 2-Rear fume duct, 2.1-Oil guide pipe, 3-Negative pressure fan, 3.1-Air inlet port, 3.2-Exhaust port, 4-Quick cooling roller, 5-Die head, 5.1-Die head lip, 6-Fixing clamp, 7-Oil collection box, 7.1-Air inlet, 7.2-Air outlet, 8.1-First tee, 8.2-Second tee, 9-Oil collection box. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] An embodiment of the present invention provides an oil fume adsorption device for a lithium battery separator casting die, such as... Figures 1 to 6As shown, the oil fume adsorption device for the lithium battery separator casting die head in this embodiment includes a front oil fume hood 1 and a rear oil fume pipe 2 respectively disposed on the front and rear sides below the die head 5. The rear oil fume pipe 2 has at least one smoke inlet on the side near the die head lip 5.1 (not shown in the figure due to obstruction). There can be one, two, or three smoke inlets, etc. In this embodiment, one smoke inlet is used. The smoke inlet is a long groove extending along the axial direction of the rear oil fume pipe 2. The bottom of the rear oil fume pipe 2 is connected to an oil guide port 2.1. Fixing clips 6 are respectively provided at the left and right ends of the rear oil fume pipe 2. One end of each fixing clip 6 clamps the end of the rear oil fume pipe 2, and the other end of each fixing clip 6 is connected to the die head 5 through a rotating shaft.

[0026] The front fume hood 1 includes a top surface 1.1, a bottom surface 1.2, and a front side surface 1.3 forming a triangular structure. The inclination angle of the top surface can be the same as or different from the inclination angle of the lower front side of the mold head. In this embodiment, the top surface 1.1 is an inclined surface with the same angle as the inclined surface of the lower front side of the mold head 5. The bottom surface 1.2 is an inclined surface that gradually slopes downward from near the mold head lip 5.1 to away from the mold head lip 5.1. The angle between the bottom surface 1.2 of the front fume hood and the horizontal plane is 10°-20°. For example, it can be any angle among 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, and 20°. At least one ventilation slot 1.4 is provided on both the bottom surface 1.1 and the top surface 1.2. The ventilation slots 1.4 are all elongated strip structures extending left and right. The front fume hood 1 is provided with a negative pressure pipe interface 1.5. Negative pressure fans 3 are connected to the negative pressure pipe interface 1.5 and the rear fume hood 2 through pipes. An oil receiving mechanism (not shown in the attached figure) is provided below the front fume hood 1. The oil receiving device is located below the cooling roller 4. The oil droplets formed on the bottom surface 1.2 of the front fume hood 1 will flow down the bottom surface of the front fume hood 1 to the lowest point due to gravity and fall into the oil receiving mechanism. The oil receiving mechanism can be an oil receiving tray or an oil receiving box, as long as it can achieve the effect of collecting and storing oil. Since the lowest point of the bottom surface of the front fume hood 1 is located above and outside the cooling roller 4, that is, beyond the cooling roller, the oil droplets will not drip onto the membrane surface.

[0027] The number of exhaust ducts 1.4 on the bottom surface 1.2 and top surface 1.1 of the front fume hood 1 can be from 2 to 20 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20). The number of exhaust ducts on the bottom or top surface can be any number exceeding 20 or less than 2, depending on the actual mold head volume and the required fume extraction intensity. This number should not be considered as exceeding the limitations of this application and thus constituting a different technical solution. The exhaust ducts 1.4 are arranged in parallel, and the number of exhaust ducts on the bottom surface 1.2 of the front fume hood is greater than the number of exhaust ducts on the top surface 1.1. In this embodiment, there are four exhaust ducts on the bottom surface 1.2 and two exhaust ducts on the top surface 1.1.

[0028] The lithium battery separator casting die oil fume adsorption device also includes an oil collection tank 7 connected to a negative pressure fan 3. The oil collection tank 7 has an air inlet 7.1 and an air outlet 7.2. The air outlet 3.2 of the negative pressure fan 3 is connected to the air inlet 7.1 of the oil collection tank 7 via a pipe. An opening is provided at the bottom of the oil collection tank 7, and an oil receiving box 9 is provided at the bottom of the oil collection tank 7. The oil collection tank configuration in this application is merely an example and should not be construed as different from this application due to differences in the oil collection tank structure. There are two negative pressure fans 3. The air inlet ports 3.1 of the two negative pressure fans 3 are respectively connected to a first tee 8.1 and a second tee 8.2. The front fume hood 1 has two negative pressure pipe interfaces 1.5, which are respectively located on the left and right sides of the front fume hood 1. The two negative pressure pipe interfaces 1.2 are respectively connected to the first tee 8.1 via pipes. The rear fume duct 2 adopts a tubular structure with open ends, and both ends of the rear fume duct 2 are respectively connected to the second tee 8.2 via pipes. The oil collection tank 7 has two air inlets 7.1, and the air outlet ports 3.2 of the two negative pressure fans 3 are respectively connected to the two air inlets 7.1 of the oil collection tank 7. The negative pressure fans 3 are turbine fans. The negative pressure fans 3 are connected to the negative pressure pipe interfaces 1.5, and the negative pressure fans are connected to the rear fume duct 2 via flexible steel wire hoses. Other connection methods can also be selected according to actual usage needs. The pipe connection in this embodiment is only an example; other connection methods can be selected according to actual usage needs.

[0029] Behind the die head is the casting process. Below the die head is a cooling roller with a very low temperature, not exceeding 12°C. After the melt comes out from the die head lip, it can reduce the temperature of the melt on the die lip (around 200°C) to room temperature, and the melt state changes from liquid to solid sheet material. Therefore, the fume pipe is formed into a movable and flexible adjustable position through the fixing clamp.

[0030] This invention utilizes two negative pressure fans to draw air from the front fume hood and rear fume duct, creating negative pressure inside both. Fumes from the front of the die head are drawn into the front fume hood through the upper and lower suction slots, while fumes from the rear of the die head are drawn into the rear fume duct through the inlet. Therefore, fumes generated on both sides of the die head are drawn away by the front and rear fume hoods respectively. Fumes drawn into the front fume hood are discharged through the negative pressure pipe interface, while fumes drawn into the rear fume duct are discharged from both ends. Oil droplets formed in the rear fume duct are discharged through the oil guide pipe; oil droplets formed in the front fume hood are discharged by gravity through the suction slot on the bottom surface and fall into the oil collection tray. The fumes drawn in by the front and rear fume hoods enter the oil collection box, and the oil droplets are finally collected on the oil collection tray.

[0031] In practical use, this invention effectively absorbs and removes most of the oil fumes, thereby reducing their generation. Since oil fumes generated at the lip of the mold head evaporate upwards, the oil fume adsorption device of this invention is installed on the front and rear sides of the lower part of the mold head, specifically at the lip. Because the front fume hood and rear fume pipe are under negative pressure, the generated oil fumes are directly adsorbed inside these components. The fumes are then discharged through the pipe to the rear outlet oil collection tank. If there is condensed oil in the oil collection tank, it can drip directly into the lower oil receiving box. The oil collection tank is connected to a professional oil fume purification and treatment device outside the room via a pipe, where the oil fumes are treated and then discharged.

[0032] The lithium battery separator casting die oil fume adsorption device of the present invention has the following advantages: 1. Since the front fume hood and the rear fume pipe are respectively located on the front and rear sides of the die lip, they will not affect the process personnel's observation of the molten shape of the die lip, and can observe the adhesion status of the molten material to the subsequent cooling roller, preventing poor adhesion from going undetected in time, which could lead to defects such as uneven thickness and large thin spots.

[0033] 2. The bottom surface of the front fume hood is inclined, and the angle between this bottom surface and the horizontal plane is within 20°. When absorbing fumes, it will not affect the temperature of the molten material at the lip of the die head. After the fumes hit the lower part of the front fume hood and form oil accumulation points, due to the inclined bottom surface, the oil droplets will flow down the bottom surface of the front fume hood to the lowest point and fall into the oil receiving tray due to gravity. This can prevent oil droplets from forming thin spot defects on the film surface.

[0034] 3. The temperature of the die lip has a significant impact on the physical properties of the membrane surface. During the condensation of the melt into a solid state, the die lip temperature must remain constant. It is necessary to ensure that the fume extraction device can effectively remove the fumes without affecting the die lip temperature. If the die lip temperature is reduced, the temperature of the melt flowing to the die lip will be abnormal, thus affecting the membrane surface. Therefore, fume extraction should not be performed directly on the die lip. In this invention, fume extraction is achieved through suction channels on the top and bottom surfaces of the front fume hood. These channels have straight openings, which effectively extract fumes without affecting the diaphragm's performance and preventing the die head from cooling down too quickly. Although this sacrifices some fume extraction efficiency, it controls the stability of the die head temperature, thus not affecting the diaphragm's performance.

[0035] While embodiments of the present invention have been described in detail above, the invention is not limited to the embodiments described above. The scope of the invention as defined by the appended claims includes all equivalent substitutions and variations.

Claims

1. A lithium battery separator casting die head oil fume adsorption device, characterized in that: It includes a front fume hood and a rear fume duct respectively located on the front and rear sides below the mold head. The rear fume duct has at least one fume inlet on the side near the lip of the mold head, and an oil guide port is connected to the bottom of the rear fume duct. The front fume hood includes a top surface, a bottom surface, and a front side surface forming a triangular structure. The bottom surface of the front fume hood is an inclined surface that gradually slopes downward from near the lip of the mold head to away from the lip of the mold head. At least one exhaust groove is provided on both the bottom surface and the top surface. The front fume hood is provided with a negative pressure pipe interface, and both the negative pressure pipe interface and the rear fume duct are connected to a negative pressure fan.

2. The lithium battery separator casting die oil fume adsorption device according to claim 1, characterized in that: An oil-collecting mechanism is provided below the front fume hood. The top surface of the front fume hood is an inclined surface that slopes in the same direction as the lower front side of the mold head. The angle of inclination can be the same as or different from the angle of inclination of the lower front side of the mold head. The exhaust duct adopts a long strip structure that extends horizontally or vertically. The negative pressure pipe interface provided on the front fume hood can be connected to a negative pressure fan through a pipe. The rear fume hood can be connected to a negative pressure fan through a pipe. An oil-collecting device can be provided below the front fume hood.

3. The oil fume adsorption device for lithium battery separator casting die head according to claim 1, characterized in that: The lithium battery separator casting die head oil fume adsorption device also includes an oil collection box connected to a negative pressure fan. The oil collection box is provided with at least one air inlet and at least one air outlet. The air outlet of the negative pressure fan is connected to the air inlet of the oil collection box.

4. The lithium battery separator casting die oil fume adsorption device according to claim 3, characterized in that: There are two negative pressure fans, and the air inlet ports of the two negative pressure fans are respectively connected to a first tee and a second tee. The front fume hood has two negative pressure pipe interfaces, which are respectively located on the left and right sides of the front fume hood and are respectively connected to the first tee. The rear fume hood adopts a tubular structure with open ends, and the two ends of the rear fume hood are respectively connected to the second tee. The oil collection box has two air inlets, and the air outlet ports of the two negative pressure fans are respectively connected to the two air inlets of the oil collection box. The oil collection box has an opening at the bottom and an oil receiving box at the bottom of the oil collection box.

5. The lithium battery separator casting die oil fume adsorption device according to claim 1, characterized in that: The negative pressure fan is a turbine fan, and the negative pressure fan is connected to the negative pressure pipe interface and the negative pressure fan is connected to the rear fume duct via steel wire hoses.

6. The oil fume adsorption device for lithium battery separator casting die head according to claim 1, characterized in that: The angle between the bottom surface of the front fume hood and the horizontal plane is 10°-20°.

7. The lithium battery separator casting die oil fume adsorption device according to claim 1, characterized in that: The number of exhaust ducts on the bottom and top surfaces of the front fume hood is between 2 and 20, and the exhaust ducts are arranged in parallel.

8. The lithium battery separator casting die oil fume adsorption device according to claim 7, characterized in that: The number of exhaust vents on the bottom surface of the front fume hood is greater than the number of exhaust vents on the top surface.

9. The oil fume adsorption device for lithium battery separator casting die head according to claim 1, characterized in that: The left and right ends of the rear exhaust pipe are respectively equipped with fixing clips. One end of each fixing clip clamps the end of the rear exhaust pipe, and the other end of each fixing clip is connected to the mold head through a rotating shaft.

10. The oil fume adsorption device for lithium battery separator casting die head according to claim 1, characterized in that: The smoke inlet is a long groove extending along the axial direction of the rear fume duct.

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