White oil recovery system for lithium battery diaphragm preparation

Abstract

The utility model discloses a white oil recovery system for preparing a lithium battery diaphragm, which is used for recovering white oil dripped from a casting section, a thickness measuring section and a longitudinal drawing section, and comprises a plurality of oil receiving trays, a plurality of oil storage tanks and a plurality of oil storage tanks, the plurality of oil receiving boxes are arranged at the longitudinal pulling section, are distributed at intervals along the movement direction of the casting piece, and are communicated with the oil outlet of the oil receiving tray through a pipeline; the transfer tank is communicated with the oil outlet of the oil receiving box through a pipeline; the oil storage tank is communicated with the transfer tank through a pipeline, and a water pump is arranged on the pipeline between the transfer tank and the oil storage tank. According to the white oil recovery system for preparing the lithium battery diaphragm, the white oil dropping from the working sections of sheet casting, thickness measurement, longitudinal stretching and the like can be effectively recovered, the recovery process is efficient, and the labor cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery separator manufacturing technology, and specifically to a white oil recovery system for lithium battery separator preparation. Background Technology

[0002] The production process of lithium battery separators is divided into two main categories: dry process and wet process. The wet process is currently the mainstream production process. The process flow includes: mixing and heating white oil and polyethylene to form a homogeneous system; cooling and phase separation by passing through casting rollers; longitudinal stretching and bidirectional synchronous stretching; extraction of white oil using an organic solvent; and then drying, transverse stretching and shaping, and winding to finally obtain the finished separator. A thickness gauge is installed between the casting and longitudinal stretching sections to measure the thickness of the casting. To collect the white oil dripping from the casting rollers, thickness gauge, and longitudinal stretching equipment and prevent it from dripping onto the ground, existing lithium battery separator production lines have white oil trays installed at the casting, thickness measurement, and longitudinal stretching sections. When the trays are full, the plugs at the bottom of the white oil trays need to be manually removed to drain the oil, which is then collected in a basin or tray and transferred to an oil drum for storage. This process is difficult, time-consuming, and labor-intensive. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this utility model is to provide a material receiving device for a filter press that eliminates the need for shoveling sludge in the sludge tank, effectively reducing the labor intensity of workers while improving material receiving efficiency.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A white oil recovery system for lithium battery separator preparation, used to recover white oil dripping from the casting section, thickness measurement section, and longitudinal stretching section, including:

[0006] Multiple oil receiving trays are respectively set at the casting section and the thickness measurement section;

[0007] Multiple oil collection boxes are located at the longitudinal tension section and are distributed at intervals along the direction of casting movement. They are connected to the oil outlet of the oil collection tray through pipes.

[0008] The transfer tank is connected to the oil outlet of the oil receiving box via a pipeline;

[0009] An oil storage tank is connected to the transfer tank via a pipeline, and a water pump is installed on the pipeline between the transfer tank and the oil storage tank.

[0010] In some embodiments, the depth of the plurality of oil collection boxes gradually increases along the direction of movement of the casting, and adjacent oil collection boxes are connected by a pipe.

[0011] In some embodiments, the oil outlet of the oil receiving box at the head end is connected to the oil inlet of the transfer tank via a pipe.

[0012] In some embodiments, the oil collection box is provided with a foot pedal for pedaling.

[0013] In some embodiments, the foot pedal is a grille.

[0014] In some embodiments, the foot pedal and the oil collection box are at the same height.

[0015] In some embodiments, the oil receiving box has an overflow port, which is connected to the oil inlet of the temporary storage tank via a pipe.

[0016] In some embodiments, the water pump is a pneumatic diaphragm pump.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The white oil recovery system for lithium battery separator preparation proposed in this utility model can effectively recover the white oil dripping from stages such as casting, thickness measurement and longitudinal stretching. The recovery process is highly efficient and greatly reduces labor costs. Attached Figure Description

[0019] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0020] Figure 1 This is a schematic diagram of the white oil recovery system for lithium battery separator preparation proposed in this utility model.

[0021] Figure 2 yes Figure 1 A top-view structural diagram.

[0022] Figure 3 yes Figure 2 A cross-sectional diagram.

[0023] Figure 4 This is a schematic diagram of the white oil recovery process of the white oil recovery system for lithium battery separator preparation proposed in this utility model.

[0024] Explanation of icon numbers:

[0025] 1. Base; 2. Oil collection unit; 21. Oil receiving tray; 22. Oil receiving box; 3. Transfer tank; 4. Temporary storage tank; 5. Water pump; 6. Oil storage tank; 7. Foot pedal. Detailed Implementation

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0027] like Figures 1 to 4 As shown, the white oil recovery system for lithium battery separator preparation proposed in this utility model includes an oil collection unit 2 and an oil storage unit. The oil collection unit 2 is used to collect the white oil dripping from the casting section, the thickness measurement section and the longitudinal stretching section. The oil storage unit is connected to the oil collection unit 2 through a pipeline and is used to store the white oil collected by the oil collection unit.

[0028] The oil collection unit 2 includes multiple oil receiving trays 21 and multiple oil receiving boxes 22. The multiple oil receiving trays 21 are respectively arranged in the casting section and the thickness measuring section, and the multiple oil receiving boxes 22 are arranged in the longitudinal pulling section. The multiple oil receiving boxes 22 are distributed at intervals along the movement direction of the casting sheet. Adjacent oil receiving boxes 22 are connected by pipes to ensure that the white oil in one oil receiving box 22 can flow to the adjacent oil receiving box 22. The number of oil receiving boxes 22 is not specifically limited in this embodiment. As an example, in this embodiment, the longitudinal pulling section is provided with five oil receiving boxes 22. For easy distinction, these five oil receiving boxes 22 are respectively defined as the first oil receiving box, the second oil receiving box, the third oil receiving box, the fourth oil receiving box, and the fifth oil receiving box along the movement direction of the casting sheet. The depth of the oil receiving boxes gradually increases. The white oil in the first oil receiving box, the second oil receiving box, the third oil receiving box, and the fourth oil receiving box eventually converges into the fifth oil receiving box, making it less likely for the oil receiving box to overflow. It is understood that the oil receiving tray 21 at the casting section and the thickness measuring section can be connected to any one or more oil receiving boxes 22 through pipes, so that the white oil at the casting section and the thickness measuring section can flow from the oil receiving tray 21 side to the oil receiving box 22 side.

[0029] In this embodiment, the oil collection unit also includes a base 1. The base 1 has multiple mounting slots spaced along its length (the direction of movement of the casting sheet), and multiple oil collection boxes 22 are installed in these slots one-to-one. A foot pedal 7 is installed inside each oil collection box 22. The foot pedal 7 is nearly flush with the height of the oil collection box 22 and can be fixedly connected to it using snap-fit, welding, bolting, or other methods. Thus, when the equipment in the longitudinal tension section malfunctions, the operator can step on the foot pedal 7 without removing the oil collection box 22, making operation convenient and without affecting the oil collection effect of the oil collection box 22. The structure and shape of the foot pedal 7 are not limited in this embodiment, as long as it provides foot space. As an example, the foot pedal 7 can be a grid with sufficient mechanical strength, and the grid has a mesh structure, allowing white oil to flow out of the oil collection box 22 through the mesh.

[0030] The oil storage unit includes a transfer tank 3, which is a tank for collecting and storing white oil. The transfer tank 3 is connected to the oil receiving box 22 via a pipe. In this embodiment, the bottom of the oil receiving box 22 at the first end is connected to a pipe 111. The fifth oil receiving box and the transfer tank 3 are connected via the pipe 111. In the pipe 111, the white oil in the fifth oil receiving box flows from the side of the oil receiving box 22 to the side of the transfer tank 3. The top of the transfer tank 3 can be connected to a pipe 112, which connects the white oil overflow port of the transfer tank 3 and the white oil inlet of the temporary storage tank 4. In the pipe 112, the white oil overflows from the side of the transfer tank 3 to the side of the temporary storage tank 4 without overflowing the transfer tank 3.

[0031] Transfer tank 3 is connected to pipes 113 and 114, which connect the oil outlet of transfer tank 3 and the oil inlet of storage tank 6 via water pump 5. In pipes 113 and 114, the white oil in transfer tank 3 flows from the transfer tank 3 side to the storage tank 6 side. Storage tank 6 is a white oil tank located outside the production line and can supply white oil to the mixing section of the production line. Water pump 5 is used to transport white oil and can be an air pump, diaphragm pump, centrifugal pump, etc., with a pneumatic diaphragm pump being preferred due to its lack of electricity dependence, adjustable flow rate, and high flexibility.

[0032] The transfer tank 3 is equipped with a level sensor to measure the level of white oil inside the transfer tank 3. The level sensor is electrofused to a control device (as shown in the figure). The control device controls the valve connected to the pipeline 113 to open or close based on the level data collected by the level sensor. The level control in the transfer tank 3 is as follows: After receiving data from the level sensor used to measure the liquid level position in the transfer tank 3, the control device compares the received real-time level data with preset high and low level data. When the real-time level data reaches the preset high level data, the control device controls the valve connected to the pipeline to open, allowing the white oil in the transfer tank 3 to flow from the transfer tank 3 to the storage tank 6. When the real-time level data drops to the preset low level data, the control device controls the valve connected to the pipeline to close, allowing the white oil to accumulate in the transfer tank 3, thereby maintaining the level of white oil in the transfer tank 3 within the preset level range.

[0033] In summary, the white oil recovery system for lithium battery separator preparation proposed in this utility model can effectively recover the white oil dripping from stages such as casting, thickness measurement, and longitudinal stretching. The recovery process is highly efficient and greatly reduces labor costs.

[0034] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A white oil recovery system for lithium battery separator preparation, used to recover white oil dripping from the casting section, thickness measurement section, and longitudinal stretching section of a separator manufacturing line, characterized in that, include: Multiple oil receiving trays are respectively set at the casting section and the thickness measurement section; Multiple oil collection boxes are located at the longitudinal tension section and are distributed at intervals along the direction of casting movement. They are connected to the oil outlet of the oil collection tray through pipes. The transfer tank is connected to the oil outlet of the oil receiving box via a pipeline; An oil storage tank is connected to the transfer tank via a pipeline, and a water pump is installed on the pipeline between the transfer tank and the oil storage tank.

2. The white oil recovery system for lithium battery separator preparation according to claim 1, characterized in that: The depth of the multiple oil receiving boxes gradually increases along the direction of movement of the casting, and adjacent oil receiving boxes are connected by a pipe.

3. The white oil recovery system for lithium battery separator preparation according to claim 2, characterized in that: The oil outlet of the deepest oil receiving box is connected to the oil inlet of the transfer tank via a pipe.

4. The white oil recovery system for lithium battery separator preparation according to claim 1, characterized in that: The oil collection box is equipped with a foot pedal for pedaling.

5. The white oil recovery system for lithium battery separator preparation according to claim 4, characterized in that: The foot pedal is a grille.

6. The white oil recovery system for lithium battery separator preparation according to claim 4, characterized in that: The foot pedal and the oil collection box are at the same height.

7. The white oil recovery system for lithium battery separator preparation according to claim 1, characterized in that: The oil receiving box has an overflow port, which is connected to the oil inlet of the temporary storage tank via a pipe.

8. The white oil recovery system for lithium battery separator preparation according to claim 1, characterized in that: The water pump is a pneumatic diaphragm pump.

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