Overflow device for lithium battery diaphragm extraction tank

Abstract

The utility model relates to an overflow device for a lithium battery diaphragm extraction tank, and belongs to the technical field of lithium battery diaphragm manufacturing equipment. The overflow device comprises an overflow groove arranged in an extraction groove and a drainage plate, an overflow channel of the overflow groove is communicated with a liquid outlet of the extraction groove, an overflow opening is formed in one side of the overflow groove, and the drainage plate is movably installed on the overflow opening in a sealed mode and used for adjusting the overflow flow of an extraction agent. According to the scheme provided by the utility model, the extraction agents in different area positions can be ensured to have consistent flow strokes through the overflow grooves, the phenomenon of unbalanced concentration of the extraction agents is avoided, and the extraction efficiency of the diaphragm can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragm extraction equipment, in particular to an overflow device used for a lithium battery diaphragm extraction tank. Background Art

[0002] Lithium-ion battery diaphragms are an important component of lithium-ion batteries. The performance of diaphragms directly affects the overall performance of batteries. Commonly used diaphragms are polyolefin diaphragms prepared by diaphragms or wet methods. In the wet diaphragm production process, polyolefin diaphragms need to be removed from the pore-forming agent in the diaphragm by an extractant. The extraction tank, as the main equipment of the extraction process, is usually composed of 6 to 8 independent extraction units. During the extraction process, on the one hand, new extractants need to be added, and on the other hand, the extractants need to be recovered after solid-liquid extraction mass transfer. However, in actual applications, the overflow hole of the extraction tank is only set on one side, resulting in the extractant closer to the overflow hole to enter the buffer tank smoothly, while the extractant farther from the overflow hole is in a static state, resulting in an unbalanced effective concentration of the extractant in the extraction tank, resulting in differences in the morphology of the diaphragm and affecting the quality of the diaphragm. Utility Model Content

[0003] In order to overcome the problems existing in the related technology, the utility model provides an overflow device for a lithium battery diaphragm extraction tank, which can ensure that the extractant in different areas has a consistent flow path through the overflow tank, avoid the concentration imbalance of the extractant, and improve the extraction efficiency of the diaphragm.

[0004] The first aspect of the utility model provides an overflow device for a lithium battery diaphragm extraction tank, comprising an overflow tank and a drain plate arranged in the extraction tank, the overflow tank is connected to the liquid outlet of the extraction tank, the first side wall of the overflow tank overflows the extractant, the drain plate is arranged on the first side wall of the overflow tank, and the drain plate is used to adjust the overflow flow of the extractant.

[0005] In some embodiments, the overflow tank includes a main body and an overflow plate, the main body is arranged on the inner wall of the extraction tank, the overflow plate is connected to the main body, one end surface of the overflow plate away from the main body is the overflow surface, the overflow surface is parallel to the liquid surface of the extraction tank, and the guide plate is sealed and installed on the overflow plate.

[0006] In some embodiments, the guide plate is connected and fixed to the overflow plate by bolts.

[0007] In some embodiments, the guide plate has two sides with a first end surface and a second end surface opposite to each other, and the first end surface is close to the overflow surface.

[0008] In some embodiments, a gap is formed between the first end surface of the guide plate and the overflow surface, and the gap is used to guide the extractant.

[0009] In some embodiments, the first end surface of the guide plate contacts and abuts against the overflow surface, and the second end surface of the guide plate is used to guide the extractant.

[0010] In some embodiments, the overflow trough is obliquely disposed on the inner wall of the extraction tank, the overflow trough is inclined upward from the liquid outlet, and the height of the liquid outlet is lower than the height of the liquid level in the extraction tank.

[0011] In some embodiments, the overflow grooves are provided on the four inner side walls of the extraction tank.

[0012] In some embodiments, the overflow trough and the guide plate are both made of cold-rolled plates.

[0013] The technical solution provided by the utility model may have the following beneficial effects:

[0014] It can be seen from the above technical scheme that the overflow device provided by the utility model, the overflow trough is installed in the extraction tank and is connected to the liquid outlet of the extraction tank, and the extractant overflows through the first side wall of the overflow trough. Under this design, the extractant in each area position in the extraction tank can have a consistent flow path, and the overflow flow rate of the extractant can be adjusted by the guide plate to maintain the concentration balance of each area position of the extraction tank and ensure stable extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0016] Figure 1 It is a structural schematic diagram of an extraction device shown in an embodiment of the utility model;

[0017] Figure 2 It is an enlarged schematic diagram of the overflow device shown in the embodiment of the utility model;

[0018] Figure 3 It is a schematic diagram of the overflow effect of the overflow device shown in the embodiment of the utility model;

[0019] Figure 4 It is another schematic diagram of overflow effect of the overflow device shown in the embodiment of the utility model;

[0020] Figure 5 It is another structural schematic diagram of the extraction device shown in the embodiment of the utility model.

[0021] Reference numerals:

[0022] 1. Extraction tank; 11. Liquid outlet;

[0023] 2. Overflow device; 21. Overflow trough; 211. Main body; 212. Overflow plate; 22. Drain plate; 220. First end face; 221. Second end face. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0025] The inventors of the present application discovered that in the overflow design of the conventional lithium battery diaphragm extraction equipment, a corresponding overflow hole is opened on one side of the extraction tank to recover the extractant for solid-liquid mass transfer. Only the extractant closer to the overflow hole can smoothly enter the buffer tank, while the extractant farther from the overflow hole is in a relatively static state, has a longer flow path, and cannot be recovered through the overflow hole, resulting in an unbalanced concentration or back-mixing in various areas of the extraction tank, causing a decrease in extraction efficiency and even causing differences in the formation of the diaphragm, affecting the diaphragm quality.

[0026] In response to the above problems, an embodiment of the utility model provides an overflow device 2 for a lithium battery diaphragm extraction tank 1, which can ensure that the extractant in different areas has a consistent flow path through the overflow tank 21, avoid concentration imbalance of the extractant, and improve the extraction efficiency of the diaphragm.

[0027] The technical solution of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0028] Figure 1It is a structural schematic diagram of the extraction device shown in the embodiment of the utility model. The specific structure and principle of the device are as follows: Each extraction tank 1 is generally divided into two extraction units, and each extraction unit is provided with two rollers to transfer the diaphragm. A roller is also provided between the two extraction units to transfer the diaphragm. The diaphragm moves under the rotation of the roller and is immersed in the extractant. The pore-forming agent inside the diaphragm and the extractant perform solid-liquid mass transfer, and the diaphragm generates a porous microscopic morphology. In the process of solid-liquid mass transfer, the extractant is mixed with substances such as pore-forming agents, and the concentration of the extractant slowly decreases, resulting in a step-by-step decrease in the extraction efficiency. In order to solve this problem, the extraction efficiency of the extractant is maintained by introducing a new extractant. The introduction of a new extractant into the extraction tank 1 is generally introduced from the bottom of the extraction tank 1. The extractant flows from bottom to top, thereby driving the flow of the liquid in the extraction tank 1. When it flows to the liquid surface, it can overflow through the overflow port of the overflow tank 21, thereby entering the buffer tank and waiting for recovery.

[0029] like Figure 1 As shown, an embodiment of the utility model provides an overflow device 2 for a lithium battery diaphragm extraction tank 1, comprising an overflow tank 21 and a drain plate 22 arranged in the extraction tank 1, the overflow tank 21 is connected to the liquid outlet 11 of the extraction tank 1, the first side wall of the overflow tank 21 overflows the extractant, the drain plate 22 is arranged on the first side wall of the overflow tank 21, and the drain plate 22 is used to adjust the overflow flow of the extractant.

[0030] Specifically, the overflow trough 21 is connected to the liquid outlet 11 of the extraction tank 1, and after the extractant overflows from the first side wall of the overflow trough 21 to the overflow trough 21, it can flow to the liquid outlet 11 for recovery. In this embodiment, the liquid outlet 11 is connected to the overflow trough 21, and the extractant is blocked by the overflow trough 21, so that the extractant cannot be directly overflowed and recovered through the liquid outlet 11. The guide plate 22 is arranged on the first side wall of the overflow trough 21, and the overflow flow rate of the extractant is adjusted by the guide plate 22. When installing the overflow device 2, the overflow trough 21 can be welded to the inner side wall of the extraction tank 1 by welding, and the side away from the inner side wall of the extraction tank 1 is the first side wall.

[0031] In this embodiment, the arrangement direction of the liquid outlet 11 can be arranged according to actual conditions.

[0032] In this embodiment, an overflow groove 21 is arranged in the extraction tank 1 so that the flow path between the positions of various regions of the extraction tank 1 and the overflow groove 21 tends to be consistent. When the extractant flows from bottom to top to the liquid surface of the extraction tank 1, overflow recovery can be achieved under the action of the overflow hole and the guide plate 22, which can reduce the concentration imbalance in various regions of the extraction tank 1, ensure a relatively consistent extraction efficiency, avoid the inability to completely extract the pore-forming agent in the diaphragm, and cause large differences in the porous microscopic morphology of the diaphragm, thereby affecting the quality of the diaphragm.

[0033] In another embodiment of an overflow device 2 provided by the embodiment of the utility model, the overflow tank 21 of the overflow device 2 includes a body 211 and an overflow plate 212, the body 211 is arranged on the inner wall of the extraction tank 1, the overflow plate 212 is connected to the body 211, one end face of the overflow plate 212 away from the body 211 is an overflow face, the overflow face is parallel to the liquid surface of the extraction tank 1, and the guide plate 22 is sealed and installed on the overflow plate 212. When installing the body 211, it can be done by welding. The body 211 can be installed on the inner wall of the extraction tank 1 in a horizontal plane, or can be installed on the inner wall of the extraction tank 1 in an inclined setting. In this embodiment, the overflow channel is connected to the liquid outlet 11, so that the extraction tank 1 can be discharged smoothly from the liquid outlet 11.

[0034] In a preferred embodiment, one end of the overflow plate 212 connected to the main body 211 can be adapted to the end face of the main body 211, and the overflow surface formed by the other end of the overflow plate 212 is parallel to the liquid surface of the extraction tank 1. Under this setting, it can be ensured that each area of ​​the overflow port formed by the overflow plate 212 has a consistent overflow speed, thereby ensuring the consistency of the flow stroke.

[0035] In another embodiment of an overflow device 2 provided by the present invention, the overflow plate 212 of the overflow device 2 is connected and fixed to the guide plate 22 by bolts. In a preferred embodiment, the bolts are made of cold-rolled steel plate material resistant to dichloromethane, and bolts of different sizes can be selected according to the size of the threaded hole, and their strength can also be set according to actual strength requirements.

[0036] In another embodiment of an overflow device 2 provided by an embodiment of the utility model, the two sides of the guide plate 22 of the overflow device 2 have a first end face 220 and a second end face 221 opposite to each other, and the first end face 220 is close to the overflow face. In this embodiment, the shapes of the first end face 220 and the second end face 221 of the guide plate 22 can be set to a tooth-shaped structure, a wavy structure, or a straight-line structure. When the shape of the guide plate 22 is a tooth-shaped or wavy structure, the overflow area of ​​the guide plate 22 for the extractant can be increased, so that turbulence is formed on the first end face 220 or the second end face 221 of the guide plate 22, thereby increasing the flow velocity of the extractant.

[0037] In another embodiment of the overflow device 2 provided by the present invention, a gap is formed between the first end surface 220 of the guide plate 22 of the overflow device 2 and the overflow surface, and the gap is used to guide the extractant. Figure 3 In this embodiment, the guide plate 22 is installed on the overflow plate 212 by bolts, and there is a certain gap between the end surfaces of the guide plate 22 and the overflow plate 212. When the extractant flows through the gap, it can be recovered in the overflow channel through the gap. By adjusting the installation height of the guide plate 22, the height of the gap can be adjusted, thereby controlling the overflow flow rate of the extraction tank 1.

[0038] In another embodiment of an overflow device 2 provided by the present utility model, please refer to Figure 4 The first end surface 220 of the guide plate 22 of the overflow device 2 is in contact with and abuts against the overflow surface, and the second end surface 221 of the guide plate 22 is used to guide the extractant.

[0039] In another embodiment of an overflow device 2 provided by the embodiment of the utility model, the overflow groove 21 of the overflow device 2 is obliquely arranged on the inner wall of the extraction tank 1, and the overflow groove 21 is inclined upward from the liquid outlet 11, and the height of the liquid outlet 11 is lower than the height of the liquid level of the extraction tank 1. Under this arrangement, an overflow channel can be formed in the overflow groove 21, and the overflow channel has a certain inclination, so that the extractant entering the overflow groove 21 can be quickly recovered through the liquid outlet 11, and the extractant is prevented from gathering in the overflow channel and affecting the overflow effect.

[0040] In another embodiment of an overflow device 2 provided by the present invention, the four inner side walls of the extraction tank 1 of the overflow device 2 are all provided with the overflow tank 21. Figure 5Corresponding overflow grooves 21 are arranged on the four inner walls of the extraction tank 1 to increase the overflow port and drainage flow rate of the overflow device 2. The flow path between the various regional positions of the extractant can be further shortened, and the extractant at the center of the liquid surface of the extraction tank 1 can be overflowed and recovered with a smaller flow path.

[0041] In another embodiment of an overflow device 2 provided by the present invention, the overflow groove 21 and the guide plate 22 of the overflow device 2 are both made of cold-rolled plates.

[0042] Compared with the prior art, the overflow device 2 provided by the utility model can maintain the dynamic balance of the extractant in the extraction tank 1 and balance the concentration of the extractant in various regions by setting an overflow tank 21 in the extraction tank 1 and adjusting the overflow flow of the extractant through the guide plate 22, thereby improving the extraction efficiency and extraction effect of the diaphragm.

[0043] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An overflow device for a lithium battery diaphragm extraction tank, characterized in that: It includes an overflow groove and a drainage plate arranged in the extraction tank, the overflow groove is connected to the liquid outlet of the extraction tank, the first side wall of the overflow groove overflows the extractant, the drainage plate is arranged on the first side wall of the overflow groove, and the drainage plate is used to adjust the overflow flow of the extractant.

2. The overflow device according to claim 1, characterized in that The overflow tank includes a body and an overflow plate, the body is arranged on the inner wall of the extraction tank, the overflow plate is connected to the body, one end surface of the overflow plate away from the body is the overflow surface, the overflow surface is parallel to the liquid surface of the extraction tank, and the guide plate is sealed and installed on the overflow plate.

3. The overflow device according to claim 2, characterized in that: The guide plate is connected and fixed to the overflow plate by bolts.

4. The overflow device according to claim 3, characterized in that: The guide plate has a first end surface and a second end surface opposite to each other on both sides, and the first end surface is close to the overflow surface.

5. The overflow device according to claim 4, characterized in that: A gap is formed between the first end surface of the guide plate and the overflow surface, and the gap is used to guide the extractant.

6. The overflow device according to claim 4, characterized in that The first end surface of the guide plate contacts and abuts against the overflow surface, and the second end surface of the guide plate is used for guiding the extractant.

7. The overflow device according to claim 1, characterized in that: The overflow trough is obliquely arranged on the inner side wall of the extraction tank, and the overflow trough is inclined upward from the liquid outlet, and the height of the liquid outlet is lower than the height of the liquid level in the extraction tank.

8. The overflow device according to claim 1, characterized in that The overflow grooves are arranged on the four inner side walls of the extraction tank.

9. The overflow device according to claim 1, characterized in that: The overflow trough and the guide plate are both made of cold-rolled plates.

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