Extraction device of lithium battery diaphragm

Abstract

The extraction device comprises a liquid discharging mechanism and a liquid pumping mechanism, the liquid discharging mechanism comprises a liquid inlet tank and a liquid discharging tank arranged on the periphery or the side of the liquid inlet tank, an opening is formed in the bottom of the liquid inlet tank, and the opening is used for allowing the diaphragm to penetrate through and allowing extraction liquid to enter the liquid inlet tank; an overflow port for the extraction liquid to flow out is formed in the side of the liquid inlet tank, the extraction liquid in the liquid inlet tank flows into the liquid discharging tank through the overflow port, and the liquid pumping mechanism is used for pumping out the extraction liquid in the liquid discharging tank so as to discharge the extraction liquid out of the liquid discharging mechanism. During use, the diaphragm enters the liquid inlet tank from the upper part of the liquid inlet tank, so that the extraction liquid in the liquid inlet tank is firstly in direct contact with the diaphragm for extraction, and the extracted extraction liquid overflows to the liquid discharge tank and then is extracted by the liquid extraction mechanism, so that the local concentration is prevented from being too high, and the running of the diaphragm is not influenced in the liquid extraction process; and the problem of abnormal membrane surface caused by overhigh local concentration of the extraction liquid is thoroughly solved.

Description

Technical Field

[0001] The utility model specifically relates to an extraction device for a lithium battery diaphragm. Background Art

[0002] Extraction is an important process in the manufacturing process of lithium battery separators. In order to improve the poor adhesion between the ceramic separator and the base film during the manufacturing process of lithium battery separators, a layer of material with good adhesion (such as PVDF) needs to be coated on the surface of the membrane.

[0003] At present, the coating of diaphragms mainly includes water-based coating and oil-based coating. Water-based coating uses water as a solvent. After coating, it can directly enter the oven to dry the water, and finally obtain a finished diaphragm.

[0004] Oily coating uses organic solvent as solvent. After coating, it needs to enter the extraction liquid to extract the solvent and then enter the drying oven. After the extraction liquid is evaporated, it is dried to obtain a finished diaphragm.

[0005] However, the overflow tank of the existing extraction device (such as Chinese patent CN212383225U) is usually designed at the end of the water tank and is far away from the diaphragm. After being coated, the diaphragm enters the water tank to contact the extractant for extraction. However, since the overflow tank is designed at the end of the water tank and is far away from the diaphragm, the flow rate of the extractant that first directly contacts the diaphragm is very slow, which can easily lead to excessive local concentration of the liquid, thereby causing abnormalities on the membrane surface. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide a lithium battery diaphragm extraction device which can completely solve the problem of membrane surface abnormality caused by excessively high local concentration of extraction liquid in view of the deficiencies of the prior art.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A lithium battery diaphragm extraction device, the extraction device includes a drainage mechanism and a liquid extraction mechanism, the drainage mechanism includes a liquid inlet tank and a drainage tank arranged on the periphery or side of the liquid inlet tank, the bottom of the liquid inlet tank has an opening, the opening is used for allowing the diaphragm to pass through and for allowing the extraction liquid to enter the liquid inlet tank, the side of the liquid inlet tank has an overflow port for the extraction liquid to flow out, the extraction liquid in the liquid inlet tank flows into the drainage tank through the overflow port, and the liquid extraction mechanism is used to extract the extraction liquid in the drainage tank to discharge the drainage mechanism.

[0009] According to some implementation aspects of the utility model, the liquid discharge mechanism includes a trough body, in which a plurality of partitions are arranged, the plurality of partitions extend upward from the bottom of the trough body and are arranged together, the plurality of partitions separate the interior of the trough body into the liquid inlet trough and the liquid discharge trough, and the plurality of partitions surround the liquid inlet trough, and the opening is provided at the bottom of the trough body corresponding to the position of the liquid inlet trough.

[0010] According to other implementation aspects of the utility model, the liquid discharge mechanism includes a trough body, a plurality of partitions are arranged in the trough body, the plurality of partitions extend upward from the bottom of the trough body, at least some of the plurality of partitions are connected to the side walls of the trough body, the plurality of partitions divide the interior of the trough body into the liquid inlet trough and the liquid discharge trough, and the plurality of partitions and the side walls of the trough body are arranged to form the liquid inlet trough, and the opening is provided at the bottom of the trough body corresponding to the position of the liquid inlet trough.

[0011] In some specific embodiments, at least one of the partitions is lower than the side wall of the tank, and the overflow port is formed above the partition. Furthermore, all of the partitions are lower than the side wall of the tank.

[0012] In some specific embodiments, the liquid level of the extract in the drain tank is lower than the height of the partition forming the overflow port, so that the extract in the inlet tank that is in direct contact with the diaphragm can be drawn away in time.

[0013] In some specific embodiments, the length of the opening and the length of the liquid inlet groove are respectively greater than the width of the diaphragm.

[0014] In some specific embodiments, the two opposite side walls of the trough body extend upward to form extension parts, and the extension parts on both sides are respectively provided with installation grooves extending in the up-down direction, and the installation grooves are used to adjust the installation height of the drainage mechanism.

[0015] According to some implementation aspects of the utility model, the liquid pumping mechanism includes a liquid drainage pipe connected to the liquid drainage trough and a liquid drainage pump arranged on the liquid drainage pipe.

[0016] In some specific embodiments, the extraction device further comprises a control system connected to the liquid displacement pump.

[0017] In some embodiments, the liquid displacement pump is a pneumatic diaphragm pump.

[0018] In some specific embodiments, the drainage pipes are respectively provided at both ends of the drainage mechanism, and the drainage pump is provided on each drainage pipe.

[0019] In some specific embodiments, the extraction device also includes a plurality of extraction tanks arranged in sequence, the drainage mechanism is arranged in the first extraction tank, the extraction liquid in the first extraction tank enters the liquid inlet tank through the opening of the drainage mechanism, then overflows to the drainage tank, and then is discharged from the extraction tank through the pumping mechanism.

[0020] In some specific embodiments, an extraction liquid inlet is opened at the lower portion of the last extraction tank.

[0021] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0022] When the extraction device of the utility model is used, the diaphragm enters the liquid inlet tank from above the liquid inlet tank, so that the extraction liquid in the liquid inlet tank is first directly contacted with the diaphragm for extraction, and the extracted extraction liquid overflows to the liquid discharge tank and is then pumped out by the liquid pumping mechanism, thereby accelerating the flow rate of the extraction liquid that first directly contacts with the diaphragm, avoiding excessive local concentration, and having no effect on the movement of the diaphragm during the liquid pumping process, thus completely solving the problem of membrane surface abnormality caused by excessive local concentration of the extraction liquid.

[0023] The liquid extraction process of the extraction device of the utility model is a continuous process, which does not affect the continuity of machine production and can effectively improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of an extraction device according to a representative embodiment of the utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the liquid discharge mechanism and the liquid discharge pipe of the extraction device;

[0026] Figure 3 for Figure 1 A top view of a drain mechanism of an extraction device;

[0027] Figure 4 for Figure 1 A side view of a drain mechanism of an extraction device;

[0028] In the figure: 1, drainage trough; 2, partition; 3, liquid inlet trough; 4, mounting trough; 5, drainage pipe; 6, pipe joint; 7, trough body; 7a, extension part; 8, extraction tank; 9, baffle. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0030] like Figures 1 to 4The extraction device for the lithium battery diaphragm shown includes a plurality of extraction tanks 8 arranged in sequence from front to back. The other extraction tanks 8 except the first extraction tank respectively have overflow outlets for the extraction liquid to flow out. The overflow outlet of any extraction tank except the second extraction tank is higher than the overflow outlet of the extraction tank in front of it so that the extraction liquid can flow into the extraction tank in front. An extraction liquid inlet is opened at the bottom of the last extraction tank.

[0031] During extraction, the extract in the first extraction tank is first in direct contact with the diaphragm for extraction, and the extract that first contacts the diaphragm has the highest extraction rate, so that the extract that first contacts the diaphragm has the highest concentration. Therefore, the existing extraction device usually has a local excessive concentration of the extract in the first extraction tank, resulting in membrane surface abnormalities.

[0032] See also Figure 1 The extraction device of the lithium battery diaphragm also includes a drainage mechanism and a liquid extraction mechanism. The drainage mechanism includes a liquid inlet tank 3 and a liquid drainage tank 1 arranged outside the liquid inlet tank 3. The bottom of the liquid inlet tank 3 has an opening, which is used for the diaphragm to pass through and for the extraction liquid to enter the liquid inlet tank 3. The side of the liquid inlet tank 3 has an overflow port for the extraction liquid to flow out. The extraction liquid in the liquid inlet tank 3 flows into the liquid drainage tank 1 through the overflow port. The liquid extraction mechanism is used to extract the extraction liquid in the liquid drainage tank 1 to discharge the drainage mechanism.

[0033] Specifically in this example, the liquid discharge mechanism includes a trough body 7, in which a plurality of partitions 2 are arranged, and the plurality of partitions 2 extend upward from the bottom of the trough body 7 and are arranged together. The plurality of partitions 2 separate the interior of the trough body 7 into a liquid inlet trough 3 and a liquid discharge trough 1. An opening is opened at the bottom of the trough body 7 corresponding to the position of the liquid inlet trough 3. The length of the opening 5 and the length of the liquid inlet trough 3 are respectively greater than the width of the diaphragm. The height of all partitions 2 is lower than the height of the side wall of the trough body 7, and the overflow port is formed above all partitions 2.

[0034] The two opposite side walls of the tank body 7 extend upward to form extension parts 7a. The two side extension parts 7a are respectively provided with mounting grooves 4 extending in the up-down direction. The mounting grooves 4 are used to adjust the installation height of the liquid discharge mechanism.

[0035] The tank body 7 is installed in the first extraction tank by means of bolts and nuts. The bolts pass through the installation slot 4 and the slot wall of the first extraction tank in turn to install the tank body in the first extraction tank. The height position of the tank body 7 in the first extraction tank can be adjusted by the position of the bolt passing through the installation slot 4.

[0036] During actual extraction, the extraction liquid enters the liquid inlet tank 3 from the opening, and the diaphragm enters the liquid inlet tank 3 from the top of the liquid inlet tank 3 and then passes through the opening to pass through the liquid inlet tank 3, so that the extraction liquid in the liquid inlet tank 3 is first in direct contact with the diaphragm for extraction, and the extraction liquid in the liquid inlet tank 3 overflows into the liquid discharge tank 1, and is then extracted by the extraction mechanism, thereby accelerating the flow rate of the extraction liquid that is first in direct contact with the diaphragm, avoiding excessive local concentration of the extraction liquid, improving the extraction effect, and having no effect on the movement of the diaphragm during the extraction process, thus completely solving the problem of membrane surface abnormality caused by excessive local concentration of the extraction liquid.

[0037] In actual application, it is necessary to control the liquid level in the drainage trough 1 to be lower than the height of the partition 2 to speed up the flow rate of the extraction liquid, and to promptly extract the high-concentration extraction liquid to improve the extraction effect. Otherwise, the extraction liquid in the inlet trough 3 flows slowly, and the extraction liquid in contact with the diaphragm cannot be promptly discharged, which affects the extraction effect and causes membrane surface abnormalities.

[0038] The liquid pumping mechanism includes a liquid discharge pipe 5 connected to the liquid discharge tank 1 , a liquid discharge pump arranged on the liquid discharge pipe 5 , and a control system connected to the liquid discharge pump.

[0039] Drain pipes 5 are respectively provided at both ends of the tank body 7. Each drainage pipe 5 is provided with a drainage pump. The control system is connected to all the drainage pumps and controls each drainage pump to work independently without affecting each other.

[0040] All positive displacement pumps are air-operated diaphragm pumps.

[0041] Baffles 9 are respectively arranged at both ends along the length direction of the trough body 7. The baffles 9 at each end are arranged at the top of the trough body 7. A pipe joint 6 connected to the drainage trough 1 is arranged on the baffles 9 at each end at the position of the drainage trough 1, and the drainage pipe 5 is connected to the pipe joint 6.

[0042] When the extraction device is actually extracting, the diaphragm is not in direct contact with any part of the tank body 7, reducing the risk of foreign matter being brought in. The entire extraction process of the diaphragm can be completed continuously without affecting production efficiency.

[0043] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A lithium battery separator extraction device, characterized in that: The extraction device includes a drainage mechanism and a liquid pumping mechanism. The drainage mechanism includes a liquid inlet tank and a drainage tank arranged on the periphery or side of the liquid inlet tank. The bottom of the liquid inlet tank has an opening, and the opening is used for allowing a diaphragm to pass through and for allowing an extract to enter the liquid inlet tank. The side of the liquid inlet tank has an overflow port for the extract to flow out. The extract in the liquid inlet tank flows into the drainage tank through the overflow port. The liquid pumping mechanism is used to pump out the extract in the drainage tank to discharge the drain mechanism.

2. The extraction device for lithium battery separator according to claim 1, characterized in that: The liquid discharge mechanism includes a trough body, in which a plurality of partitions are arranged, and the plurality of partitions extend upward from the bottom of the trough body and are arranged together. The plurality of partitions separate the interior of the trough body into the liquid inlet trough and the liquid discharge trough, and the plurality of partitions surround the liquid inlet trough, and the opening is provided at the bottom of the trough body corresponding to the position of the liquid inlet trough.

3. The extraction device for lithium battery separator according to claim 1, characterized in that: The liquid discharge mechanism includes a trough body, in which a plurality of partitions are arranged, and the plurality of partitions extend upward from the bottom of the trough body, and at least some of the plurality of partitions are connected to the side walls of the trough body, and the plurality of partitions divide the interior of the trough body into the liquid inlet trough and the liquid discharge trough, and the plurality of partitions and the side walls of the trough body are arranged to form the liquid inlet trough, and the opening is provided at the bottom of the trough body corresponding to the position of the liquid inlet trough.

4. The extraction device for lithium battery separator according to claim 2 or 3, characterized in that: The height of at least one of the partitions is lower than the height of the side wall of the tank body, and the overflow port is formed above the partition.

5. The extraction device for lithium battery separator according to claim 4, characterized in that: The heights of all the partitions are lower than the heights of the side walls of the tank body.

6. The extraction device for lithium battery separator according to claim 4, characterized in that: The liquid level of the extract in the drainage tank is lower than the height of the partition forming the overflow port.

7. The extraction device for lithium battery separator according to claim 2 or 3, characterized in that: The two opposite side walls of the trough body extend upward to form extension parts, and the extension parts on both sides are respectively provided with mounting grooves extending in the up-down direction, and the mounting grooves are used to adjust the installation height of the liquid discharge mechanism.

8. The extraction device for lithium battery separator according to claim 1, characterized in that: The liquid pumping mechanism includes a liquid discharge pipe connected to the liquid discharge groove and a liquid discharge pump arranged on the liquid discharge pipe; and / or the length of the opening and the length of the liquid inlet groove are respectively greater than the width of the diaphragm.

9. The extraction device for lithium battery separator according to claim 8, characterized in that: The extraction device further comprises a control system connected to the drainage pump; and / or the drainage pump is a pneumatic diaphragm pump; and / or the drainage pipes are respectively provided at both ends of the drainage mechanism, and each drainage pipe is provided with the drainage pump.

10. The extraction device for lithium battery separator according to any one of claims 1 to 3, characterized in that: The extraction device also includes a plurality of extraction tanks arranged in sequence, the drainage mechanism is arranged in the first extraction tank, the extraction liquid in the first extraction tank enters the liquid inlet tank through the opening of the drainage mechanism, then overflows to the drainage tank, and then is discharged from the extraction tank through the pumping mechanism.

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