Lithium battery pole piece coating preheating equipment

Abstract

The invention relates to the field of lithium batteries, in particular to lithium battery pole piece coating preheating equipment which comprises a bottom plate, a winder, a coating machine, a preheater and the like. A plurality of winders are mounted on the bottom plate; a coating machine is mounted on the bottom plate; and a preheater is mounted on the bottom plate. Through a simple negative pressure adsorption structure, water vapor generated by an undried pole piece is gathered, when circulating airflow passes through a sponge block, water contained in the airflow is adsorbed through the sponge block, the airflow is prevented from carrying the water to make contact with the pole piece again, and therefore the problems that in the prior art, in the baking process, the water vapor generated by coating the pole piece rises, and the drying effect is poor are solved. When the coating pole piece is dried, the coating pole piece is in contact with hot air blown downwards and is driven downwards by the hot air to be in contact with the coating pole piece again, and the drying time of the coating pole piece is greatly prolonged by repeating the steps.

Description

Technical Field

[0001] The present invention relates to the field of lithium batteries, and particularly to a preheating device for coating lithium battery electrode sheets. Background Art

[0002] In the battery manufacturing process, the coating process of the positive and negative electrode sheets is a very important link. In addition to the process of coating the slurry, which will affect the battery performance, the drying process of the coated electrode sheets will also significantly affect the battery performance.

[0003] Due to the large amount of wet coating on the battery electrode sheets and the difficulty of drying, currently, an oven is often used to directly bake the coated electrode sheets by means of hot air convection. However, during the baking process, the water vapor generated by the coated electrode sheets will rise, contact the hot air blown downward, and be driven downward by the hot air to contact the coated electrode sheets again. This process is repeated, greatly prolonging the drying time of the coated electrode sheets, and there is room for improvement. Summary of the Invention

[0004] In order to overcome the disadvantages mentioned in the background, the present invention provides a preheating device for coating lithium battery electrode sheets.

[0005] The technical solution is as follows: A preheating device for coating lithium battery electrode sheets includes a bottom plate, a winder, a coater, and a preheater; several winders are installed on the bottom plate; a coater is installed on the bottom plate; a preheater is installed on the bottom plate; it further includes a mounting frame, a mounting plate, a rectangular ventilation pipe, a flow guiding block, and a sponge block; several symmetrically distributed mounting frames are fixedly connected to the bottom plate; several symmetrically distributed mounting plates are fixedly connected to all the mounting frames together; each mounting plate is provided with a rectangular ventilation pipe; each rectangular ventilation pipe is communicated with several air nozzles distributed in a curve array along the rectangular ventilation pipe; each rectangular ventilation pipe is installed with a flow guiding block; each flow guiding block is provided with a wind gathering port; each flow guiding block is provided with several ventilation ports, and all the ventilation ports on the same flow guiding block are jointly communicated with the wind gathering port.

[0006] Further, the lower part of the mounting plate is set as a quadrangular pyramid structure with a larger upper part and a smaller lower part.

[0007] Further, it further includes a blowing plate; several symmetrically distributed blowing plates are installed on the preheater, and the blowing direction of the blowing plate is towards the coater.

[0008] Further, it further includes a flow guiding plate and an electric push rod; several symmetrically distributed flow guiding plates are provided on the coater, and each flow guiding plate is fixedly connected to the corresponding mounting plate on the corresponding side; each sponge block is provided with several electric push rods, and the fixed parts of all the electric push rods are fixedly connected to the corresponding flow guiding blocks respectively; each flow guiding block is provided with several moisture discharge ports, and the moisture discharge ports are in one-to-one correspondence and communication with the ventilation ports, and the sponge block is slidably connected to the moisture discharge ports.

[0009] Further, the deflector covers the coating area of the coater.

[0010] Further, each sponge block is provided with a stretch cloth, and all the stretch cloths are respectively connected to the deflector blocks on the corresponding sides.

[0011] Further, each deflector block is fixedly connected with a plurality of baffles.

[0012] Further, all the baffles on the same deflector block are fixedly connected with an inclined plate together, and the height of the inclined plate is lower than that of the baffles.

[0013] Further, all the baffles on the same deflector block are arranged in an "eight" - shaped structure on the side facing the air - blowing plate.

[0014] The beneficial effects of the present invention are as follows: 1. Through a simple negative - pressure adsorption structure, the present invention aggregates the water vapor generated by the undried electrode sheet. When the circulating air flow passes through the sponge block, the sponge block adsorbs the moisture contained in the air flow, preventing the air flow from carrying moisture and contacting the electrode sheet again. In this way, the problem in the prior art that during the baking process, the water vapor generated by the coated electrode sheet rises, contacts the hot air blown downward, and is driven downward by the hot air to contact the coated electrode sheet again, repeating this process and greatly prolonging the drying time of the coated electrode sheet is solved.

[0015] 2. By controlling the air - blowing plate to blow out air flow to the right, after the air flow passes through the inside of the pre - heater, it then blows towards the coater. In this way, the air flow blown out by the air - blowing plate wraps the pre - heated part of the base material, forming an air curtain on the outside of the base material, preventing the outside cold air and dust in the air from contacting the base material and ensuring that the slurry coating can stably adhere.

[0016] 3. The present invention dries the sponge block by the air flow blown out by the air - blowing plate to the right, and the air flow passing through the upper part of the deflector block takes away the moisture adsorbed in the sponge block, so that the sponge block can be quickly put into use.

[0017] 4. The present invention forms a long and narrow air duct by the front and rear two baffles together. Utilizing the venturi effect, the air flow velocity is increased, and the drying effect of the air flow on the sponge block is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the first structural schematic diagram disclosed by the present invention;

[0019] Figure 2 is the second structural schematic diagram disclosed by the present invention;

[0020] Figure 3 is the structural schematic diagram of the baffle disclosed by the present invention;

[0021] Figure 4Structural sectional view of the mounting plate disclosed by the present invention;

[0022] Figure 5 Exploded view of the structures of the mounting plate, rectangular ventilation duct and flow guide block disclosed by the present invention;

[0023] Figure 6 Schematic structural diagram of the flow guide block disclosed by the present invention;

[0024] Figure 7 Structural sectional view of the flow guide block disclosed by the present invention;

[0025] Figure 8 Schematic diagram of the airflow direction disclosed by the present invention.

[0026] Reference numerals in the drawings: 1 - bottom plate, 2 - rewinder, 3 - coater, 4 - preheater, 5 - mounting frame, 6 - mounting plate, 7 - rectangular ventilation duct, 8 - flow guide block, 9 - sponge block, 10 - telescopic cloth, 20 - blowing plate, 21 - flow guide plate, 22 - electric push rod, 30 - baffle, 31 - inclined plate, 001 - base material, 002 - electrode sheet, 8001 - air collecting port, 8002 - ventilation port, 8003 - moisture exhaust port. Detailed implementation manners

[0027] The following is only a preferred embodiment of the present invention, and does not limit the protection scope of the present invention accordingly.

[0028] Embodiment 1

[0029] A lithium battery electrode sheet coating and preheating device, as Figures 1-8 shown, includes a bottom plate 1, a rewinder 2, a coater 3 and a preheater 4; at least two winders 2 are installed on the bottom plate 1; a coater 3 is installed on the bottom plate 1; a preheater 4 is installed on the bottom plate 1;

[0030] It further includes a mounting frame 5, a mounting plate 6, a rectangular ventilation duct 7, a flow guide block 8 and a sponge block 9; at least two symmetrically distributed mounting frames 5 are bolted to the bottom plate 1; at least two symmetrically distributed mounting plates 6 are bolted together by all the mounting frames 5; each mounting plate 6 is provided with a rectangular ventilation duct 7; each rectangular ventilation duct 7 is communicated with a plurality of nozzles arranged in a curve array along the rectangular ventilation duct 7; each rectangular ventilation duct 7 is installed with a flow guide block 8; each flow guide block 8 is provided with an air collecting port 8001; each flow guide block 8 is provided with at least four ventilation ports 8002, and all the ventilation ports 8002 on the same flow guide block 8 are jointly communicated with the air collecting port 8001.

[0031] The lower part of the mounting plate 6 is set as a quadrangular pyramid structure with a large upper part and a small lower part.

[0032] The working process of the present invention is as follows:

[0033] First, electrically connect the coiler 2, the coater 3, and the preheater 4 to the controller, and connect the rectangular ventilation duct 7 to an external hot air box;

[0034] Subsequently, as Figure 1 shown, wind the substrate 001 around the coiler 2. Then, control the left coiler 2 to release the substrate 001 and the right coiler 2 to wind up the substrate 001, so that the substrate 001 moves horizontally from left to right;

[0035] When the substrate 001 passes through the preheater 4, heat the upper and lower surfaces of the substrate 001 through the preheater 4 to perform the preheating work of the substrate 001, so as to improve the efficiency of subsequent coating and drying;

[0036] When the substrate 001 passes through the coater 3 after preheating, perform the slurry coating work on the upper and lower surfaces of the substrate 001 through the coater 3, so as to form an undried electrode sheet 002 on each of the upper and lower surfaces of the substrate 001;

[0037] Next, control the substrate 001 to continue moving. When the undried electrode sheet 002 is facing the diversion block 8 and presents a state as Figure 8 shown, control the hot air box to blow dry hot air towards the substrate 001 and the undried electrode sheet 002 through the nozzles on the rectangular ventilation duct 7 to perform the conventional drying work on the undried electrode sheet 002;

[0038] At the same time, taking the upper diversion block 8 as an example, when the nozzles on the rectangular ventilation duct 7 blow hot air vertically downward, the high-speed air flow will generate a negative pressure adsorption force on the air in the ventilation port 8002, and the ventilation port 8002 is connected to the air gathering port 8001, which will also generate a negative pressure adsorption force on the air in the air gathering port 8001. Therefore, after the nozzles on the rectangular ventilation duct 7 blow hot air vertically downward, after the hot air contacts the undried electrode sheet 002, it will flow and converge towards the air gathering port 8001, and then flow into the hot air blown vertically downward by the nozzles on the rectangular ventilation duct 7 from the air gathering port 8001 and the ventilation port 8002 in sequence, thus forming a circulating air flow, as Figure 8 shown; during this process, the air gathering port 8001 is directly above the middle of the undried electrode sheet 002. Therefore, the hot air blown vertically downward by the nozzles on the rectangular ventilation duct 7 will show a flowing trend from the surrounding to the middle after contacting the substrate 001 and the undried electrode sheet 002, as Figure 8As shown in the figure, through a simple negative pressure adsorption structure, the water vapor generated by the undried electrode sheet 002 is aggregated. When the circulating air flow passes through the sponge block 9, the sponge block 9 adsorbs the moisture contained in the air flow, preventing the air flow from carrying the moisture and contacting the electrode sheet 002 again. In this way, it solves the problem in the prior art that during the baking process, the water vapor generated by the coated electrode sheet 002 will rise, contact the hot air blown downward, and be driven downward by the hot air to contact the coated electrode sheet 002 again. Repeating like this greatly prolongs the drying time of the coated electrode sheet 002.

[0039] After the undried electrode sheet 002 is dried, it continues to move along with the base material 001 and is wound by the winder 2.

[0040] During the above process, when the hot air passes through the air duct jointly formed between the flow guiding block 8 and the mounting plate 6, since the lower part of the mounting plate 6 is set as a quadrangular pyramid structure with a larger upper part and a smaller lower part, the lower part of the mounting plate 6 will guide and converge the hot air, preventing the hot air from diffusing outward and causing unnecessary heat loss.

[0041] Embodiment 2

[0042] Based on the above Embodiment 1, as Figure 2 and Figure 7 shown, it further includes a blowing plate 20; at least two symmetrically distributed blowing plates 20 are installed on the preheater 4, and the blowing direction of the blowing plate 20 faces the coater 3.

[0043] It further includes a guiding plate 21 and an electric push rod 22; at least two symmetrically distributed guiding plates 21 are provided on the coater 3, and each guiding plate 21 is fixedly connected to the corresponding side mounting plate 6; each sponge block 9 is provided with at least two electric push rods 22, and the fixed parts of all the electric push rods 22 are fixedly connected to the corresponding side flow guiding block 8. Each flow guiding block 8 is provided with at least four moisture discharge ports 8003, and the moisture discharge ports 8003 correspond to and communicate with the ventilation ports 8002 one by one, and the sponge block 9 is slidably connected to the moisture discharge ports 8003.

[0044] The guiding plate 21 covers the coating area of the coater 3. By covering the coating area of the coater 3 with the guiding plate 21, while guiding the air flow blown out by the blowing plate 20 to the right, it protects the coating area of the coater 3, preventing the air flow blown out by the blowing plate 20 to the right from blowing the slurry output by the coater 3, resulting in the slurry flowing and being difficult to form.

[0045] Each sponge block 9 is provided with a stretchable cloth 10, and all the stretchable cloths 10 are respectively connected to the corresponding side flow guiding block 8.

[0046] The specific working process of the present invention is as follows:

[0047] In the prior art, in order to improve the efficiency of pole piece coating, a preheating method is generally adopted, so that heat is conducted through the substrate 001 to the slurry coating, thereby preheating the slurry coating from the inside out, and then improving the drying efficiency. However, after the substrate 001 is preheated, its surface temperature is much higher than the outdoor temperature. During the process of the substrate 001 moving to the coater 3, the substrate 001 contacts the air with a lower temperature outside. When the cold air contacts the substrate 001, condensation occurs on the surface of the substrate 001, and water mist or water droplets are generated, which affects the adhesion of the slurry coating.

[0048] Therefore, when the substrate 001 passes through the preheater 4, the present invention controls the air blowing plate 20 to blow out air to the right, so that the air flows through the inside of the preheater 4 and then blows towards the coater 3. In this way, the air blown out by the air blowing plate 20 wraps the substrate 001 part after preheating, and forms an air curtain outside the substrate 001, avoiding the contact between the outside cold air and dust in the air and the substrate 001, and ensuring that the slurry coating can be stably adhered.

[0049] It should be noted that after a long time of moisture interception work, the sponge block 9 will be in a saturated state and will not be able to intercept more moisture. The subsequent excess moisture will then be incorporated into the hot air blown vertically downward by the air nozzles on the rectangular ventilation pipe 7 along with the air flow, affecting the drying efficiency.

[0050] Therefore, in the above process, taking the upper diversion block 8 as an example, whenever a pole piece 002 is dried and moves away from the diversion block 8, the telescopic part of the electric push rod 22 is controlled to drive the sponge block 9 to move upward, so that the sponge block 9 is exposed at the moisture discharge port 8003. At the same time, the air flow blown out by the air blowing plate 20 to the right will be guided by the diversion plate 21 and pass above the diversion block 8. In this way, the air flow blown out by the air blowing plate 20 to the right can be used to dry the sponge block 9, and the moisture adsorbed in the sponge block 9 is carried away by the air flow passing above the diversion block 8, so that the sponge block 9 can be quickly put into use.

[0051] Subsequently, the telescopic part of the electric push rod 22 is controlled to drive the sponge block 9 to move downward, so that the sponge block 9 continues to block the ventilation opening 8002 and plays a dehumidifying role.

[0052] It should be noted that the telescopic cloth 10 will stretch and contract adaptively as the sponge block 9 rises and falls. When the sponge block 9 rises, the telescopic cloth 10 stretches adaptively to block the ventilation opening 8002, preventing the water vapor remaining at the air collecting opening 8001 from flowing into the circulating air flow through the ventilation opening 8002.

[0053] Embodiment 3

[0054] On the basis of the above Embodiment 2, as Figures 2-3As shown, each flow guiding block 8 is bolted with at least two baffles 30.

[0055] All the baffles 30 on the same flow guiding block 8 are fixedly connected with an inclined plate 31 together, and the height of the inclined plate 31 is lower than that of the baffle 30, so that the existence of the inclined plate 31 will not affect the normal flow of air.

[0056] All the baffles 30 on the same flow guiding block 8 are arranged in an "eight" - shaped structure on the side facing the blowing plate 20. By the baffles 30 in the "eight" - shaped structure, the air flow is gathered to reduce the diffusion of the air flow and the loss of heat.

[0057] The working process of the present invention is as follows:

[0058] When the air flow blown out by the blowing plate 20 dries the sponge block 9, a narrow air duct is jointly formed by the front and rear two baffles 30. Utilizing the venturi effect, the air flow velocity is increased, and the drying effect of the air flow on the sponge block 9 is improved.

[0059] At the same time, the inclined plate 31 plays a role in intercepting the air flow briefly, prolonging the residence time of the air flow, so as to prolong the drying time of the air flow on the sponge block 9 and further improve the drying effect of the air flow on the sponge block 9.

[0060] The above - mentioned is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A preheating device for lithium battery electrode coating, comprising a bottom plate (1), a winder (2), a coater (3) and a preheater (4); several winders (2) are installed on the bottom plate (1); a coater (3) is installed on the bottom plate (1); a preheater (4) is installed on the bottom plate (1); it is characterized in that, It further includes a mounting bracket (5), a mounting plate (6), a rectangular ventilation duct (7), a flow guiding block (8) and a sponge block (9); several symmetrically distributed mounting brackets (5) are fixedly connected to the bottom plate (1); several symmetrically distributed mounting plates (6) are fixedly connected by all the mounting brackets (5); each mounting plate (6) is provided with a rectangular ventilation duct (7); each rectangular ventilation duct (7) is communicated with several air nozzles arrayed along the curve of the rectangular ventilation duct (7); each rectangular ventilation duct (7) is installed with a flow guiding block (8); each flow guiding block (8) is provided with an air gathering port (8001); each flow guiding block (8) is provided with several ventilation ports (8002), and all the ventilation ports (8002) on the same flow guiding block (8) are jointly communicated with the air gathering port (8001).

2. The preheating device for coating lithium battery electrode sheets according to claim 1, characterized in that, The lower part of the mounting plate (6) is set as a quadrangular pyramid structure with a larger upper part and a smaller lower part.

3. A lithium battery electrode coating preheating device according to any one of claims 1-2, characterized in that, It further includes a blowing plate (20); several symmetrically distributed blowing plates (20) are installed on the preheater (4), and the blowing direction of the blowing plate (20) faces the coater (3).

4. A preheating device for lithium battery electrode coating according to claim 3, characterized in that, It further includes a flow guiding plate (21) and an electric push rod (22); several symmetrically distributed flow guiding plates (21) are provided on the coater (3), and each flow guiding plate (21) is fixedly connected to the corresponding side mounting plate (6); each sponge block (9) is provided with several electric push rods (22), and the fixed parts of all the electric push rods (22) are respectively fixedly connected to the corresponding side flow guiding block (8), each flow guiding block (8) is provided with several moisture exhaust ports (8003), and the moisture exhaust ports (8003) correspond to and are communicated with the ventilation ports (8002) one by one, and the sponge block (9) is slidably connected to the moisture exhaust ports (8003).

5. The preheating device for coating lithium battery electrode sheets according to claim 4, characterized in that, The flow guiding plate (21) covers the coating area of the coater (3).

6. The preheating device for lithium battery electrode coating according to claim 5, characterized in that, Each sponge block (9) is provided with a telescopic cloth (10), and all the telescopic cloths (10) are respectively connected to the corresponding side flow guiding block (8).

7. A lithium battery electrode coating preheating device according to any one of claims 6, characterized in that, Each flow guiding block (8) is fixedly connected with several baffles (30).

8. A preheating device for coating lithium battery electrode sheets according to claim 7, characterized in that, All the baffles (30) on the same flow guiding block (8) are jointly fixedly connected with an inclined plate (31), and the height of the inclined plate (31) is lower than that of the baffles (30).

9. A lithium battery electrode coating preheating device according to claim 8, characterized in that, All the baffles (30) on the same flow guiding block (8) facing the blowing plate (20) are jointly set in an "eight" - shaped structure.

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