Diaphragm water bath cooling device for lithium battery diaphragm production line

Abstract

The utility model relates to the technical field of lithium battery production equipment, in particular to a diaphragm water bath cooling device for a lithium battery diaphragm production line, which comprises a water bath tank, a water inlet hard pipe, a water outlet hard pipe, a first overflow tank and a chilling roller, the lower part of the chilling roller is immersed in the water bath; the multiple water inlet hard pipes are distributed around the outer circumference of the chilling roller in an arc shape from top to bottom with the axis of the chilling roller as the center axis, the middles of the water inlet hard pipes are arranged in the water bath, and the water outlet hard pipes are located on the side, close to the bottom of the water bath and away from the water inlet hard pipes, in the water bath; the first overflow tank is arranged obliquely above the chilling roller and is connected with a water source; the water bath tank, the first overflow tank and the chilling roller are matched to form a double-side cooling structure, so that the inner side and the outer side of the diaphragm are uniformly cooled at the same time, the temperature gradient difference of the two sides is eliminated, the difference value of the stripping force of the two surfaces of the diaphragm base diaphragm is reduced, and the problem of physical property difference of the two surfaces of the diaphragm caused by a single cooling mode in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production equipment technology, specifically a membrane water bath cooling device for a lithium battery separator production line. Background Technology

[0002] In the production process of lithium battery separators, the cooling process is a critical step, and the cooling effect directly affects the product quality of the separator.

[0003] In current diaphragm production, diaphragm cooling mainly employs a single quench roller or a combination of multiple quench rollers. Cooling is achieved through direct contact between the diaphragm and the surface of the cooling roller. However, this method has significant problems: only the side of the diaphragm in contact with the quench roller cools rapidly, while the other side cools down more slowly. This results in a large temperature gradient difference between the two sides of the diaphragm, leading to differences in crystallinity and density on both sides of the diaphragm base film. Ultimately, this manifests as a large difference in peel force between the two sides, affecting subsequent coating processes and reducing the yield of the finished diaphragm.

[0004] To solve the above problems, it is necessary to develop a membrane water bath cooling device that can achieve uniform cooling on both sides of the membrane. Utility Model Content

[0005] The purpose of this invention is to provide a membrane water bath cooling device for a lithium battery separator production line. The device cools the outer side of the membrane through a water bath and a first overflow tank, and cools the inner side of the membrane through a cooling roller. At the same time, it provides uniform cooling to both sides of the membrane, thereby improving the consistency of membrane properties and product quality, and thus solving the technical problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a water bath cooling device for a lithium battery separator production line, comprising a water bath tank, an inlet hard pipe, an outlet hard pipe, a first overflow tank, and a quenching roller.

[0007] The chilling roller is positioned above the water bath, with its lower part immersed in the water bath.

[0008] The water inlet hard pipe is provided in several parts, and the water inlet hard pipe is arranged parallel to the axis of the quenching roller. It is distributed in an arc shape around the outer circumference of the quenching roller from top to bottom with the axis of the quenching roller as the central axis. The middle part of the water inlet hard pipe is located in the water bath tank and is connected to the water source.

[0009] The outlet hard pipe is located inside the water bath tank, near the bottom of the tank and away from the inlet hard pipe;

[0010] The first overflow trough is located diagonally above the cooling roller and connected to a water source; the water source provides cooling water to the first overflow trough and the inlet hard pipe.

[0011] Furthermore, the water inlet rigid pipe is provided with duckbill-shaped water spray holes, which are arranged obliquely downward and are tangent to the outer circumference of the cooling roller. The direction of the water flow sprayed from the water spray holes is parallel to the direction of diaphragm movement.

[0012] Furthermore, it also includes a water distributor and an inlet hose; the water source is connected to the water distributor; the water distributor is connected to one end of the inlet hose; and the other end of the inlet hose is connected to the inlet end of the inlet hard pipe.

[0013] Furthermore, the water outlet hard pipe is provided with a drain hole, and the drain end of the water outlet hard pipe is connected to the water outlet hose; the water outlet hose is connected to the oil-water separation system, and the oil-water mixture in the water bath is transported to the oil-water separation system through the water outlet hose.

[0014] Furthermore, the first overflow tank is a tank structure, which is divided into multiple cavities by multiple baffles. The top of the first overflow tank is provided with a rectangular overflow port and an overflow plate. The width of the overflow port is the same as the width of the overflow plate. The overflow plate is a guide channel structure with upright plates on both sides and its width is greater than the width of the diaphragm. A water supply pipe is provided at the bottom of the first overflow tank and is connected to a water source.

[0015] Furthermore, it also includes a second overflow tank; the second overflow tank is located on the inner wall of the right side of the water bath tank, the water level in the water bath tank is not lower than the top of the second overflow tank, and a pipe is provided at the bottom of the second overflow tank to connect with the oil-water separation system.

[0016] Furthermore, it also includes an air knife dewatering device; the air knife dewatering device is located on the movement path of the diaphragm leaving the water surface of the water bath, and is located on the upper and lower sides of the diaphragm.

[0017] Beneficial effects:

[0018] The water bath, first overflow tank and chiller roller of this invention work together to form a double-sided cooling structure, so that the inner and outer sides of the membrane are cooled uniformly at the same time, eliminating the temperature gradient difference between the two sides, reducing the difference in peel force between the two sides of the diaphragm base membrane, and solving the problem of the difference in physical properties between the two sides of the membrane caused by the single cooling method in the prior art.

[0019] The multiple inlet hard pipes of this utility model are set at different depths to ensure that the water temperature in each area of ​​the water bath is consistent; the first overflow tank shares the same water source with the water bath, which further ensures the consistency of the cooling water temperature. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a front view of the diaphragm water bath cooling system of this utility model;

[0022] Figure 2 This is a perspective view of the overall structure of the diaphragm water bath cooling system of this utility model;

[0023] Figure 3 This is a cross-sectional view of the diaphragm water bath cooling system of this utility model.

[0024] In the picture:

[0025] 1. Water bath; 2. Inlet rigid pipe; 3. Outlet rigid pipe; 4. Inlet flexible hose; 5. Outlet flexible hose; 6. First overflow trough; 7. Air knife dewatering device; 8. Oil-water separation system; 9. Quenching roller; 10. Second overflow trough; 11. Die head; 12. Spray nozzle. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] To achieve the above objectives, this utility model provides the following technical solution, such as... Figure 1-3 As shown, a membrane water bath cooling device for a lithium battery separator production line includes a water bath tank 1, an inlet hard pipe 2, an outlet hard pipe 3, a first overflow tank 6, and a quenching roller 9.

[0028] A water bath 1 is placed below a cooling roller 9. The cooling roller 9 is used for cooling and forming the film. The lower part of the cooling roller 9 is immersed in the water bath 1. The surface of the cooling roller 9 is in contact with the front of the film to cool the inside of the film.

[0029] In this embodiment, there are four water inlet hard pipes 2. All four water inlet hard pipes 2 are parallel to the axis of the cooling roller 9 and are distributed in an arc shape around the outer circumference of the cooling roller 9 from top to bottom with the axis of the cooling roller 9 as the central axis. The middle part of the four water inlet hard pipes 2 is located in the water bath 1, and both ends extend outward through the side wall of the water bath 1 and are connected to the water source. The four water inlet hard pipes 2 are distributed at four depths and simultaneously discharge cooling water into the water bath 1 to ensure that the water temperature at each depth is consistent.

[0030] The outlet hard pipe 3 is located inside the water bath 1, near the bottom of the tank and away from the inlet hard pipe 2, and is used to discharge the cooling water in the water bath 1.

[0031] The first overflow trough 6 is mounted obliquely above the cooling roller 9 via a bracket, and is connected to a water source. The water source provides cooling water to the first overflow trough 6 and the inlet hard pipe 2. The first overflow trough and the water bath share the same water source, ensuring consistent water temperature.

[0032] Furthermore, the middle of the water inlet pipe 2 is provided with a duckbill-shaped water spray hole 12. The water spray hole 12 is set obliquely downward and its direction is tangent to the outer circumference of the cooling roller 9. Since the diaphragm is attached to the outer circumference of the cooling roller 9 during production, the direction of the water flow sprayed from the water spray hole 12 is parallel to the direction of movement of the diaphragm. The advantage of doing this is that the water flow will not directly impact the diaphragm.

[0033] Furthermore, it also includes a water distributor and inlet hoses 4; the water source is connected to the water distributor; one end of the water distributor is connected to the inlet hose 4; the other end of the inlet hose 4 is connected to the inlet end of the inlet rigid pipe 2. Specifically, cooling water enters the water distributor from the water source, and the water distributor has 8 outlets to divide the water flow into 8 parts, which are respectively set on both sides of the water bath 1; both ends of the inlet rigid pipe 2 are inlets; a total of 8 flanges are set at both ends of the 4 inlet rigid pipes 2; and the inlet hoses 4 are connected to the inlet rigid pipes 2.

[0034] Furthermore, the water outlet hard pipe 3 is provided with a drain hole, and the drain end of the water outlet hard pipe 3 is connected to the water outlet hose 5; the water outlet hose 5 is connected to the oil-water separation system 8 to transport the oil-water mixture in the water bath 1 to the oil-water separation system 8.

[0035] Furthermore, the first overflow trough 6 is a trough structure, internally divided into multiple cavities by multiple baffles. The function of these cavities is to reduce the impact force of the water flow. When the cooling water is discharged from the water supply pipe, it carries a certain impact force and cannot directly impact the diaphragm. It needs to be buffered by the first overflow trough 6 before flowing out through the overflow port. The top of the first overflow trough 6 is provided with a rectangular overflow port and an overflow plate. The width of the overflow port is the same as the width of the overflow plate. The overflow plate is a guide trough structure with vertical plates on both sides, and its width is greater than the width of the diaphragm. The overflow plate is set at an angle downward and close to the diaphragm; a water supply pipe is set at the bottom of the first overflow tank 6, which is connected to a water source. The cooling water transmitted from the water source is divided into two: one enters the first overflow tank 6, and the other enters the water bath 1 through the inlet hose 4 and the inlet hard pipe 2, so as to ensure that the water temperature in the first overflow tank 6 and the water bath 1 is the same; the water flows upward from the water supply pipe into the first overflow tank 6, and after being buffered by multiple cavities, it overflows from the overflow port and flows along the overflow plate to the outside of the diaphragm to achieve cooling of the outside of the diaphragm.

[0036] Furthermore, a second overflow tank 10 is included. The second overflow tank 10 is located on the inner wall of the right side of the water bath 1. During operation, the water level in the water bath 1 is maintained at a level no lower than the top of the second overflow tank 10. When the amount of grease floating on the water surface increases, the grease will rise above the height of the second overflow tank 10 and enter it. A pipe is installed at the bottom of the second overflow tank 10, connecting it to the oil-water separation system 8. Grease and floating matter on the water surface can overflow into the second overflow tank 10 and be transported to the oil-water separation system 8 through the pipe at the bottom of the second overflow tank 10. The oil-water separation system 8 separates the oil and water mixture. The separated water is cooled again and enters the next cycle, while the separated oil is collected and processed. The cooperation between the second overflow tank 10 and the oil-water separation system 8 removes grease and floating matter, preventing membrane contamination; the recycling of cooling water also improves water resource utilization.

[0037] Furthermore, it also includes an air knife water removal device 7; the air knife water removal device 7 is set on the movement path of the diaphragm after it leaves the water surface of the water bath 1 and is adjusted in direction by the guide roller. The air knife water removal device 7 is set on the upper and lower sides of the diaphragm in the direction of movement, and removes water from the surface of both sides of the diaphragm by blowing air.

[0038] The working principle and process are as follows:

[0039] The cooling water in the water source is divided into two paths. One path enters the first overflow tank 6 through the water supply pipe. After being buffered by multiple chambers, it overflows from the overflow port and flows along the overflow plate to the outside of the diaphragm. The other path enters the water distributor through the water inlet hose 4. The water distributor evenly distributes the water flow to the four water inlet hard pipes 2 and sprays it out through the duckbill-shaped water spray holes 12, so that a uniformly cooled water flow is formed in the water bath tank 1.

[0040] After the diaphragm is extruded from the die head 11, it adheres to the outer circumference of the cooling roller 9. The lower part of the cooling roller 9 is immersed in the cooling water in the water bath 1. The cooling roller 9 is used to cool the inner side of the diaphragm. At the same time, the overflow water from the first overflow groove 6 cools the outer side of the diaphragm, forming a double-sided synchronous cooling.

[0041] Grease and floating matter on the surface of the cooling water in the water bath 1 enter the second overflow tank 10 through overflow and are transported to the oil-water separation system 8 through the pipeline; the oil-water mixture inside the water bath 1 is discharged through the drain hole on the outlet hard pipe 3 and enters the oil-water separation system 8 through the outlet hose 5.

[0042] The oil-water separation system 8 separates the oil-water mixture. The separated water is cooled to a set temperature by a cooling device and then transported back to the water source for recycling. The separated oil is collected and processed uniformly.

[0043] After being cooled in a water bath, the diaphragm leaves the water surface and is oriented by guide rollers (not shown in the figure). Then it passes through the air knife dewatering device 7, where air is blown from both the upper and lower sides of the diaphragm to remove residual moisture from both sides of the diaphragm. The treated diaphragm then enters the subsequent processing steps.

[0044] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A membrane water bath cooling device for a lithium battery separator production line, characterized in that, It comprises a water bath tank (1), a water inlet hard pipe (2), a water outlet hard pipe (3), a first overflow tank (6) and a quenching roller (9). The quenching roller (9) is arranged above the water bath tank (1), and the lower part of the quenching roller (9) is immersed in the water bath tank (1). The water inlet hard pipe (2) is provided with a plurality of water inlet hard pipes (2), and the plurality of water inlet hard pipes (2) are arranged in parallel to the axis of the quenching roller (9), and are arranged in a circular arc shape around the outer circumference of the quenching roller (9) with the axis of the quenching roller (9) as the center axis from top to bottom, and the middle part of the water inlet hard pipe (2) is arranged in the water bath tank (1), and the water inlet hard pipe (2) is connected with a water source. The water outlet hard pipe (3) is located inside the water bath tank (1) near the bottom of the tank and away from the side of the water inlet hard pipe (2). The first overflow tank (6) is arranged obliquely above the quenching roller (9) and connected with a water source; the water source provides cooling water for the first overflow tank (6) and the water inlet hard pipe (2).

2. The membrane water bath cooling device for lithium battery separator production line according to claim 1, characterized in that, The water inlet hard pipe (2) is provided with a duckbill-shaped water spray hole (12), which is arranged obliquely downward and is tangent to the outer circumference of the quenching roller (9), and the water flow direction of the water spray hole (12) is parallel to the direction of the membrane movement.

3. The membrane water bath cooling device for lithium battery separator production line according to claim 1, characterized in that, It also comprises a water distributor and a water inlet hose (4); the water source is connected with the water distributor; the water distributor is connected with one end of the water inlet hose (4); the other end of the water inlet hose (4) is connected with the water inlet end of the water inlet hard pipe (2).

4. The membrane water bath cooling device for lithium battery separator production line according to claim 1, characterized in that, The water outlet hard pipe (3) is provided with a drain hole, and the drain end of the water outlet hard pipe (3) is connected with a water outlet hose (5); the water outlet hose (5) is connected with an oil-water separation system (8), and the oil-water mixture in the water bath tank (1) is transported to the oil-water separation system (8) through the water outlet hose (5).

5. The membrane water bath cooling device for lithium battery separator production line according to claim 1, characterized in that, The first overflow tank (6) is a tank structure, which is divided into a plurality of cavities by a plurality of partitions, and the top of the first overflow tank (6) is provided with a rectangular overflow port and an overflow plate, the width of the overflow port is the same as the width of the overflow plate, the overflow plate is a guide groove structure with vertical plates on both sides and its width is greater than the width of the membrane; the bottom of the first overflow tank (6) is provided with a water supply pipeline connected with a water source.

6. The membrane water bath cooling device for lithium battery separator production line according to claim 1, characterized in that, It also comprises a second overflow tank (10); the second overflow tank (10) is arranged on the inner wall of the right side of the water bath tank (1), and the water level line in the water bath tank (1) is not lower than the top of the second overflow tank (10), and the bottom of the second overflow tank (10) is provided with a pipeline connected with the oil-water separation system (8).

7. The membrane water bath cooling device for lithium battery separator production line according to claim 1, characterized in that, It also comprises a wind knife water removal device (7); the wind knife water removal device (7) is arranged on the movement path of the membrane leaving the water surface of the water bath tank (1), and is arranged on both sides of the membrane.

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