Coating machine with turn-back drying function

Abstract

The utility model discloses a turn-back drying coating machine which comprises an unwinding mechanism, a pole piece roll is arranged on the unwinding mechanism, and a pole piece is wound on a winding mechanism after sequentially penetrating through a first drying box group, a pole piece turnover mechanism and a second drying box group from the unwinding mechanism; a pole piece A surface coating mechanism is arranged between the unwinding mechanism and the first drying box group; a pole piece B surface coating mechanism is arranged between the pole piece turnover mechanism and the second drying box group; the pole piece is folded back through the pole piece turnover mechanism, so that the pole piece A-face coating mechanism and the pole piece B-face coating mechanism are arranged on the same side of the drying box set, the A-face coating mechanism and the B-face coating mechanism share the same cylinder of slurry, and the problem that the slurry on the A face and the slurry on the B face of the pole piece are inconsistent is solved.

Description

Technical Field

[0001] The utility model belongs to the field of lithium battery production, and in particular relates to a coating machine for folding and drying. Background Art

[0002] In the current lithium-ion battery pole piece coating process, the conventional return extrusion coating machine adopts an upper and lower two-layer oven, and it is necessary to arrange the A-side coating mechanism at the head of the machine and the B-side coating mechanism at the tail of the machine, resulting in the A-side coating mechanism and the B-side coating mechanism occupying a large amount of space and consuming a large amount of energy at the same time. In addition, since the A-side coating mechanism and the B-side coating mechanism are distributed at both ends of the coating machine, the A-side coating mechanism and the B-side coating mechanism cannot share the same slurry, and the consistency of the coating of the A-side and B-side of the pole piece cannot be guaranteed. Utility Model Content

[0003] The utility model aims to provide a coating machine for folding and drying, which folds the electrode by a electrode flipping mechanism, so that the electrode A side coating mechanism and the electrode B side coating mechanism are arranged on the same side of a drying box group, so that the electrode A side coating mechanism and the electrode B side coating mechanism share the same cylinder of slurry, thereby eliminating the problem of inconsistent slurry on the A side and the B side of the electrode.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0005] In the first aspect, the utility model provides a coating machine for folding and drying, including an unwinding mechanism; the electrode roll is arranged on the unwinding mechanism, and the electrode passes through the first drying box group, the electrode flipping mechanism and the second drying box group in sequence by the unwinding mechanism, and is wound on the rewinding mechanism; a electrode A surface coating mechanism is arranged between the unwinding mechanism and the first drying box group; a electrode B surface coating mechanism is arranged between the electrode flipping mechanism and the second drying box group; the electrode flipping mechanism changes the transmission direction of the electrode, and the electrode A surface coating mechanism and the electrode B surface coating mechanism are arranged on the same side of the first drying box group and the second drying box group and share the same cylinder slurry;

[0006] The pole piece is folded back through the pole piece flipping mechanism so that the A-side coating mechanism and the B-side coating mechanism are arranged on the same side of the drying box group, so that the A-side coating mechanism and the B-side coating mechanism share the same cylinder of slurry, eliminating the problem of inconsistent slurry on the A and B sides of the pole piece.

[0007] Furthermore, the first drying box group and the second drying box group are arranged in parallel; the first drying box group is arranged above the second drying box group to save space and improve the compactness of the coating machine.

[0008] Furthermore, the feed inlet and the discharge outlet of the first drying box group and the second drying box group are arranged on the same side to ensure that the A-side coating mechanism and the B-side coating mechanism share the same cylinder of slurry.

[0009] Furthermore, the first drying box group and the second drying box group include a front drying box and a rear drying box; the feed port and the discharge port are arranged on the front drying box, the electrode sheet enters the front drying box from the feed port, passes through the rear drying box after turning back, and passes through the front drying box from the discharge port. After the electrode sheet enters the front drying box, it turns back through the rear drying box, which increases the residence time of the electrode sheet in the drying box, and helps to evenly and thoroughly dry the electrode sheet.

[0010] Furthermore, the front drying box includes a shell; a partition is arranged inside the shell, and the partition divides the shell into an upper air chamber and a lower air chamber; the upper air chamber and the lower air chamber are provided with drying air nozzles and transmission rollers for transmitting pole pieces, and the partition is used to prevent the humid hot air from the upper air chamber from entering the lower air chamber, thereby affecting the moisture content of the pole pieces dried in the lower air chamber.

[0011] Furthermore, the upper air chamber is provided with an upper air inlet and an upper air outlet; the upper air inlet is connected to the drying air nozzle of the upper air chamber through a pipeline; the lower air chamber is provided with a lower air inlet and a lower air outlet; the lower air inlet is connected to the drying air nozzle of the lower air chamber through a pipeline;

[0012] A hot air blower is arranged outside the lower air inlet; the lower air outlet and the upper air inlet are connected through a circulating air duct; a hot air circulation mechanism is arranged on the circulating air duct;

[0013] By setting up a circulating air duct and a hot air circulation mechanism, the hot air can be circulated and utilized, the utilization efficiency of thermal energy can be improved, and energy consumption can be reduced.

[0014] Furthermore, a first air valve is provided on the upper air inlet; a second air valve is provided on the lower air outlet; and a circulating air valve is provided on the circulating air duct. The air volume entering and exhausting the drying box can be accurately controlled by the first air valve and the second air valve. The use of hot air can be optimized and unnecessary energy waste can be reduced by adjusting the air valve.

[0015] Furthermore, the pole piece flipping mechanism includes a mounting frame; a first flip roller and a first guide roller are provided at one end of the mounting frame; the angle between the first flip roller and the first guide roller is set to an acute angle; a second flip roller and a second guide roller are provided at the other end of the mounting frame; the angle between the second flip roller and the second guide roller is set to an acute angle; the first guide roller is arranged in parallel with the second guide roller; the winding direction of the pole piece in the pole piece flipping mechanism is the first flip roller, the first guide roller, the second guide roller and the second flip roller in sequence; the automated flipping mechanism reduces the need for manual flipping and improves production efficiency; the design of the flipping mechanism ensures that both sides of the pole piece can be coated, thereby improving the uniformity and quality of the coating.

[0016] Furthermore, the first turning roller is arranged above the second turning roller to optimize the pole piece turning mechanism and reduce the occupied space.

[0017] Furthermore, the angle between the first flip roller and the first guide roller, and the angle between the second flip roller and the second guide roller are set to 30 degrees to 60 degrees, which helps to optimize the flipping path of the pole piece, making the pole piece smoother during the flipping process, reducing resistance and potential damage.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The pole piece roll of the utility model is arranged on the unwinding mechanism, and the pole piece passes through the first drying box group, the pole piece turning mechanism and the second drying box group in sequence by the unwinding mechanism, and is then wound onto the winding mechanism; a pole piece A-side coating mechanism is arranged between the unwinding mechanism and the first drying box group; a pole piece B-side coating mechanism is arranged between the pole piece turning mechanism and the second drying box group; the pole piece is folded back by the pole piece turning mechanism, so that the A-side coating mechanism and the B-side coating mechanism are arranged on the same side of the drying box group, so that the A-side coating mechanism and the B-side coating mechanism share the same cylinder of slurry, eliminating the problem of inconsistent slurry on the A-side and B-side of the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural diagram of a coating machine for folding and drying provided in this embodiment;

[0021] Figure 2 is an isometric view of the pole piece flipping mechanism provided in this embodiment;

[0022] Figure 3 is a side view of the pole piece flipping mechanism provided in this embodiment;

[0023] Figure 4 is a structural diagram of the front drying box provided in this embodiment;

[0024] Figure 5 is a side view of the front drying box provided in this embodiment;

[0025] Figure 6 It is a structural diagram of the rear drying box provided in this embodiment.

[0026] In the figure, 1, unwinding mechanism, 2, electrode A side coating mechanism, 3, front oven, 3-1, partition, 3-2, upper air chamber, 3-21, upper exhaust port, 3-22, upper air inlet, 3-221, first air valve, 3-3, lower air chamber, 3-31, lower exhaust port, 3-311, second air valve, 3-32, lower air inlet, 3-4, circulating air duct, 3-5, circulating air valve, 4, rear oven, 5, electrode turning mechanism, 5-1, mounting frame, 5-2, first turning roller, 5-3, first guide roller, 5-4, second guide rail, 5-5 second turning roller, 6, electrode B side coating mechanism, 7, winding mechanism, 8, electrode, 9, transmission roller, 10, drying air nozzle. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0028] It should be noted that in the description of the present invention, the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention rather than requiring that the present invention must be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. The terms "front", "rear", "left", "right", "up", and "down" used in the description of the present invention refer to the directions in the accompanying drawings, and the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0029] like Figures 1 to 6 As shown, a coating machine for folding and drying includes a unwinding mechanism 1; the electrode roll is arranged on the unwinding mechanism 1, and the electrode 8 passes through the first drying box group, the electrode flipping mechanism 5 and the second drying box group in sequence by the unwinding mechanism 1, and is wound onto the winding mechanism 7; a electrode A side coating mechanism 2 is arranged between the unwinding mechanism 7 and the first drying box group; a electrode B side coating mechanism 6 is arranged between the electrode flipping mechanism 5 and the second drying box group; the electrode flipping mechanism 5 is used to flip the electrode up and down during the movement of the electrode, so as to adapt to the electrode B side coating mechanism 6 to complete the electrode B side coating; the first drying box group and the second drying box group blow dry the wet coating of the electrode 8, and the electrode flipping mechanism 5 changes the transmission direction of the electrode, so as to ensure that the electrode A side coating mechanism 2 and the electrode B side coating mechanism 6 are arranged on the same side of the first drying box group and the second drying box group and share the same cylinder slurry, so that the A side coating mechanism and the B side coating mechanism share the same cylinder slurry, eliminating the problem of inconsistent slurry on the A side and the B side of the electrode.

[0030] The first drying box group and the second drying box group are arranged in parallel; the first drying box group is arranged above the second drying box group; the feed port and the discharge port of the first drying box group and the second drying box group are arranged on the same side; the first drying box group and the second drying box group include a front drying box 3 and a rear drying box 4; the feed port and the discharge port are arranged on the front drying box 3, and the electrode 8 enters the front drying box 3 from the feed port, passes through the rear drying box 4 after turning back, and passes through the discharge port; the upper and lower air chambers of the rear drying box 4 are connected, and the upper and lower electrode pieces are in the same air chamber, which reduces the equipment manufacturing cost.

[0031] The front drying box 3 includes a shell; a partition 3-1 is arranged in the shell, and the partition divides the shell into an upper air chamber 3-2 and a lower air chamber 3-3; the upper air chamber 3-2 and the lower air chamber 3-3 are provided with a drying air nozzle 10 and a transmission roller 9 for transmitting the pole piece; the transmission roller 9 can be designed as an adjustable roller, which has the function of quickly adjusting the level, parallelism and angle of the roller to ensure the stable operation of the pole piece.

[0032] The upper air chamber 3-2 is provided with an upper air inlet 3-22 and an upper air outlet 3-21; the upper air inlet 3-22 is connected to the drying air nozzle 10 of the upper air chamber 3-2 through a pipeline; the lower air chamber 3-3 is provided with a lower air inlet 3-32 and a lower air outlet 3-31; the lower air inlet 3-32 is connected to the drying air nozzle 10 of the lower air chamber 3-3 through a pipeline; the transmission roller 9 supports the back side of the wet coating in the electrode 8 and provides power to drive the electrode 8 to move along the traveling direction, and the partition 3-1 isolates the drying air nozzle 10 of the upper air chamber 3-2 and the drying air nozzle 10 of the lower air chamber 3-3 to prevent the humid hot air of the upper air chamber 3-2 from entering the lower air chamber 3-3 and affecting the moisture content of the dried electrode in the lower air chamber 3-3.

[0033] A hot air blower is arranged outside the lower air inlet 3-32; the lower air outlet 3-31 and the upper air inlet 3-22 are connected through a circulating air duct 3-4; a hot air circulation mechanism is arranged on the circulating air duct 3-4; a first air valve 3-221 is arranged on the upper air inlet 3-22; a second air valve 3-311 is arranged on the lower air outlet 3-31; and a circulating air valve 3-5 is arranged on the circulating air duct 3-4. The hot air of the lower air chamber 3-3 is sent to the drying air nozzle of the upper air chamber 3-2 through the hot air circulation mechanism to dry the upper wet electrode sheet, thereby realizing waste heat recovery and reducing heating power; the air volume entering the hot air circulation mechanism can be freely distributed through the first air valve 3-221, the second air valve 3-311 and the circulating air valve 3-5.

[0034] The pole piece flipping mechanism 5 includes a mounting frame 5-1; the mounting frame 5-1 is a rectangular or cube frame; a first flip roller 5-2 and a first guide roller 5-3 are provided at one end of the mounting frame 5-1; the angle between the first flip roller 5-2 and the first guide roller 5-3 is set to 30 degrees to 60 degrees; a second flip roller 5-5 and a second guide roller 5-4 are provided at the other end of the mounting frame 5-1; the angle between the second flip roller 5-5 and the second guide roller 5-4 is set to 30 degrees to 60 degrees; the first guide roller 5-3 is arranged parallel to the second guide roller 5-4; the first flip roller 5-2 is arranged above the second flip roller 5-5; the winding direction of the pole piece 8 in the pole piece flipping mechanism 5 is the first flip roller 5-2, the first guide roller 5-3, the second guide roller 5-4 and the second flip roller 5-5 in sequence; in this embodiment, the angle between the first flip roller 5-2 and the first guide roller 5-3, and the angle between the second flip roller 5-5 and the second guide roller 5-4 are set to 45 degrees.

[0035] After the pole piece flipping mechanism 5 flips the pole piece twice, the traveling direction is changed while the up-down direction of the pole piece AB surface remains unchanged, and the pole piece enters the pole piece B surface coating mechanism 6 for B surface coating. After the pole piece A surface coating mechanism 2 coats the pole piece 8 with its A surface and dries it in the first drying box group, the pole piece leaves the first drying box group with its coated surface facing downward. When it reaches the pole piece B surface coating mechanism 6, the pole piece A surface becomes upward. If there is no pole piece flipping mechanism 5, the pole piece B surface coating mechanism 6 can only coat the pole piece 8 downward at this time, and the wet film of the pole piece enters the second drying box group downward, which is easy to cause contamination of the second drying box group, and the wet film of the pole piece cannot contact the transmission roller 9, the pole piece cannot be effectively supported, and it is easy to have deviation problems. Compared with the existing return coating machine oven, this embodiment has the advantages of low equipment cost, small space occupied, high thermal energy utilization rate and energy saving.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A coating machine for folding and drying, characterized in that: It includes an unwinding mechanism; the electrode roll is arranged on the unwinding mechanism, and the electrode passes through the first drying box group, the electrode flipping mechanism and the second drying box group in sequence by the unwinding mechanism, and is then wound onto the rewinding mechanism; a electrode A side coating mechanism is arranged between the unwinding mechanism and the first drying box group; a electrode B side coating mechanism is arranged between the electrode flipping mechanism and the second drying box group; the electrode flipping mechanism changes the transmission direction of the electrode, and the electrode A side coating mechanism and the electrode B side coating mechanism are arranged on the same side of the first drying box group and the second drying box group and share the same cylinder slurry.

2. The coating machine for folding and drying according to claim 1, characterized in that: The first drying box group and the second drying box group are arranged in parallel; the first drying box group is arranged above the second drying box group.

3. The coating machine for folding and drying according to claim 1, characterized in that: The feed inlet and the discharge outlet of the first drying box group and the second drying box group are arranged on the same side.

4. The coating machine for folding and drying according to claim 3, characterized in that: The first drying box group and the second drying box group include a front drying box and a rear drying box; the feed port and the discharge port are arranged on the front drying box, the electrode sheet enters the front drying box from the feed port, passes through the rear drying box and then passes through the discharge port.

5. The coating machine for folding and drying according to claim 4, characterized in that: The front drying box comprises a shell; a partition is arranged inside the shell, and the partition divides the shell into an upper air chamber and a lower air chamber; the upper air chamber and the lower air chamber are provided with drying air nozzles and transmission rollers for transmitting pole pieces.

6. The coating machine for folding and drying according to claim 5, characterized in that: The upper air chamber is provided with an upper air inlet and an upper air outlet; the upper air inlet is connected to the drying air nozzle of the upper air chamber through a pipeline; the lower air chamber is provided with a lower air inlet and a lower air outlet; the lower air inlet is connected to the drying air nozzle of the lower air chamber through a pipeline; A hot air blower is arranged outside the lower air inlet; the lower air outlet and the upper air inlet are connected through a circulating air duct; and a hot air circulation mechanism is arranged on the circulating air duct.

7. The coating machine for folding and drying according to claim 6, characterized in that: The upper air inlet is provided with a first air valve; the lower air outlet is provided with a second air valve; and the circulating air duct is provided with a circulating air valve.

8. The coating machine for folding and drying according to claim 1, characterized in that: The pole piece flipping mechanism includes a mounting frame; a first flip roller and a first guide roller are provided at one end of the mounting frame; the angle between the first flip roller and the first guide roller is set to an acute angle; a second flip roller and a second guide roller are provided at the other end of the mounting frame; the angle between the second flip roller and the second guide roller is set to an acute angle; the first guide roller is arranged parallel to the second guide roller; the winding direction of the pole piece in the pole piece flipping mechanism is the first flip roller, the first guide roller, the second guide roller and the second flip roller in sequence.

9. The coating machine for folding and drying according to claim 8, characterized in that: The first turning roller is arranged above the second turning roller.

10. The coating machine for folding and drying according to claim 8, characterized in that: The angle between the first turning roller and the first guide roller, and the angle between the second turning roller and the second guide roller are set to 30 degrees to 60 degrees.

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