Liquid removal device for lithium battery diaphragm after extraction

Abstract

The utility model discloses a liquid removal device after lithium battery diaphragm extraction, which comprises a liquid suction roller unit and a gas-liquid separation unit, a vacuum liquid extraction unit is arranged between the liquid suction roller unit and the gas-liquid separation unit, and the vacuum liquid extraction unit is used for absorbing liquid in the liquid suction roller unit in a use state. The liquid suction roller is simple in structure, dichloromethane carried out after a diaphragm is subjected to an extraction process can be well removed under the action of the liquid suction material layer and the liquid permeation holes on the liquid suction roller, meanwhile, the dichloromethane on the liquid suction roller is pumped away in time, the phenomena of material corrosion and the like caused by the fact that liquid stays on the roller surface can be reduced, and compared with a common pressing roller, the liquid suction roller has the advantages of being simple in structure and convenient to use. The service life of the liquid absorption roller is longer, meanwhile, liquid brought into the rear end by the film is reduced, the next drying step is facilitated, the phenomena of bright spots, oil stains, water stains and the like are improved, the negative influence on the next procedure is reduced, the product rejection rate is reduced, the use amount of an extracting agent is saved, the workload of a chemical recovery system is reduced, and the purposes of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragms, in particular to a device for removing liquid after extraction of lithium battery diaphragms. Background Art

[0002] Lithium-ion batteries have the characteristics of small size, light weight, high energy density, and are safe, reliable, and can be charged and discharged quickly, becoming a hot spot in the research of new power supply technologies in recent years. The diaphragm in lithium-ion batteries has the function of separating the positive and negative electrodes and conducting lithium ions. The quality of the diaphragm determines the interface structure and internal resistance of the battery, directly affects the capacity, cycle and safety performance of the battery, and plays an important role in the overall performance of the battery.

[0003] At present, during the extraction process of lithium battery diaphragm manufacturing, the diaphragm is prone to carry a large amount of liquid into the next drying process, causing defects such as water stains, oil stains, and bright spots on the diaphragm. In addition, it will increase the loss of the extraction liquid and increase the burden on the chemical recovery system, which will have a negative impact on the use of the next process, resulting in a high scrap rate, increased costs and other negative effects. Therefore, a lithium battery diaphragm post-extraction liquid removal device is proposed to improve the above phenomenon. Utility Model Content

[0004] The utility model aims to provide a device for removing liquid after extraction of lithium battery diaphragm, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lithium battery diaphragm post-extraction liquid removal device, comprising a liquid suction roller unit and a gas-liquid separation unit, a vacuum liquid extraction unit is provided between the liquid suction roller unit and the gas-liquid separation unit, and the vacuum liquid extraction unit is used to absorb the liquid in the liquid suction roller unit when in use, the liquid suction roller unit comprises a first liquid suction roller and a second liquid suction roller arranged in parallel, the first liquid suction roller and the second liquid suction roller are provided with a plurality of liquid permeable holes penetrating to the inside of the cavity on the circumferential outer surfaces, and the first liquid suction roller and the second liquid suction roller are provided with a liquid absorbent material layer covering the liquid permeable holes on the circumferential outer surfaces.

[0006] As a further solution of the utility model: the vacuum liquid extraction unit includes a second vacuum liquid extraction pipeline and a first vacuum liquid extraction pipeline respectively connected to the first liquid suction roller and the inside of the second liquid suction roller cavity, the end of the second vacuum liquid extraction pipeline away from the first liquid suction roller is connected to the first vacuum liquid extraction pipeline, and the end of the first vacuum liquid extraction pipeline away from the second liquid suction roller is connected to the vacuum liquid extraction device.

[0007] As a further solution of the utility model: the gas-liquid separation unit includes a gas-liquid separator and a gas-liquid separator inlet arranged near the top of the circumferential outer surface of the gas-liquid separator and connected to the vacuum liquid extraction device, the gas-liquid separator gas outlet is installed on the top of the gas-liquid separator, and the gas-liquid separator liquid outlet is installed near the bottom of the circumferential outer surface of the gas-liquid separator.

[0008] As a further solution of the utility model: a separation layer is provided inside the gas-liquid separator cavity below the gas-liquid separator inlet and above the gas-liquid separator liquid outlet, and the interior of the separation layer is filled with wire mesh filler.

[0009] As a further solution of the utility model: the liquid-absorbing material layer is specifically a polymer fiber material layer.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. Through the effect of the liquid-absorbing material layer and the liquid-permeable holes on the liquid-absorbing roller, the dichloromethane carried out by the diaphragm after the extraction process can be well removed. At the same time, the dichloromethane on the liquid-absorbing roller can be timely extracted by the vacuum liquid-extracting device, which can reduce the material corrosion caused by the liquid staying on the roller surface. Compared with the ordinary pressure roller, the liquid-absorbing roller has a longer service life. At the same time, the liquid brought into the rear end of the film is reduced, which is conducive to the next drying step, improves the bright spots, oil stains, water stains and other phenomena, reduces the negative impact on the next process, reduces the product scrap rate, saves the amount of extraction agent, reduces the workload of the chemical recovery system, and achieves the purpose of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the post-extraction liquid removal device for lithium battery diaphragm of the utility model;

[0013] Figure 2 This is a schematic diagram of the liquid suction roller of the utility model;

[0014] Figure 3 It is a schematic diagram of the gas-liquid separation unit of the utility model;

[0015] In the figure: 1. first liquid suction roller; 2. second liquid suction roller; 3. liquid permeable hole; 4. liquid suction material layer; 5. first vacuum liquid extraction pipeline; 6. second vacuum liquid extraction pipeline; 7. vacuum liquid extraction device; 8. gas-liquid separator; 9. gas-liquid separator inlet; 10. gas-liquid separator gas outlet; 11. gas-liquid separator liquid outlet; 12. separation layer; 13. wire mesh filler. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1-3 In an embodiment of the utility model, a post-extraction liquid removal device for a lithium battery diaphragm is characterized in that it includes a liquid suction roller unit and a gas-liquid separation unit, a vacuum liquid extraction unit is provided between the liquid suction roller unit and the gas-liquid separation unit, and the vacuum liquid extraction unit is used to absorb the liquid in the liquid suction roller unit when in use, the liquid suction roller unit includes a first liquid suction roller 1 and a second liquid suction roller 2 arranged in parallel, the circumferential outer surfaces of the first liquid suction roller 1 and the second liquid suction roller 2 are both provided with a plurality of liquid permeable holes 3 that penetrate into the interior of the cavity, and the circumferential outer surfaces of the first liquid suction roller 1 and the second liquid suction roller 2 are both provided with a liquid absorption material layer 4 covering the liquid permeable holes 3, the liquid absorption material of the liquid absorption material layer 4 can be selected from polymer fiber materials and polymer resin adsorption groups, in this embodiment, preferably, the liquid absorption material layer 4 is a polymer fiber material, which has a good absorption effect on the dichloromethane liquid carried on the diaphragm, and the liquid absorption material layer 4 absorbs liquid and quickly penetrates from the gap flow channel into the liquid permeable holes 3 of the liquid absorption roller to achieve the purpose of absorbing liquid, and the liquid absorption roller is equivalent to a liquid collecting device.

[0018] See also Figure 1 In one embodiment, in order to facilitate the extraction of liquid from the suction roller, in this embodiment, preferably, the vacuum extraction unit includes a second vacuum extraction pipe 6 and a first vacuum extraction pipe 5 respectively connected to the inside of the cavity of the first suction roller 1 and the second suction roller 2, the end of the second vacuum extraction pipe 6 away from the first suction roller 1 is connected to the first vacuum extraction pipe 5, and the end of the first vacuum extraction pipe 5 away from the second suction roller 2 is connected to the vacuum extraction device 7, which can provide negative pressure for the inside of the cavity of the suction roller, cooperate with the suction effect of the suction roller, better absorb the dichloromethane liquid, and reduce the dichloromethane content of the diaphragm entering the next process.

[0019] See also Figure 1 and Figure 3In one embodiment, in order to separate the gas-liquid mixture of dichloromethane, in this embodiment, preferably, the gas-liquid separation unit includes a gas-liquid separator 8 and a gas-liquid separator inlet 9 provided on the circumferential outer surface of the gas-liquid separator 8 near the top and connected to the vacuum pumping device 7, a gas-liquid separator gas outlet 10 is installed on the top of the gas-liquid separator 8, a gas-liquid separator liquid outlet 11 is installed on the circumferential outer surface of the gas-liquid separator 8 near the bottom, a separation layer 12 is provided inside the cavity of the gas-liquid separator 8 below the gas-liquid separator inlet 9 and above the gas-liquid separator liquid outlet 11, and the separation layer 12 is filled with a wire mesh filler 13, further, the vacuum pumping device 7 causes the dichloromethane liquid to partially gasify; when the vacuum pumping device 7 is working, the gas-liquid mixture of dichloromethane enters the gas-liquid separator 8, the gas velocity is greatly reduced, and the droplets are separated from the airflow through gravity sedimentation and the interception effect of the wire mesh filler 13; the liquid is transported by a liquid displacement pump, and the gas enters the drying box of the next process.

[0020] The working principle and use process of the utility model are as follows: when the diaphragm of the wet production line is extracted by dichloromethane in the extraction tank, the paraffin oil in the micropores of the diaphragm is replaced by dichloromethane; however, after the diaphragm comes out of the extraction tank and before entering the next process, it is easy to carry a large amount of dichloromethane liquid; when the diaphragm carrying a large amount of dichloromethane liquid enters the liquid suction roller unit, a channel for the diaphragm to pass through is reserved between the upper and lower first liquid suction rollers 1 and the second liquid suction rollers 2. When the diaphragm passes through the liquid suction roller, a large amount of dichloromethane is absorbed by the liquid absorption material layer 4. After the liquid absorption material layer 4 absorbs the dichloromethane liquid carried by the diaphragm, it quickly penetrates into the liquid permeable holes 3 of the liquid suction roller through its own microporous gaps. At this time, The vacuum pumping device 7 is turned on, and the dichloromethane liquid entering the first suction roller 1 and the second suction roller 2 is pumped into the gas-liquid separator 8 through the first vacuum pumping pipe 5, the second vacuum pumping pipe 6 and the gas-liquid separator inlet 9 for gas-liquid separation. The gas escapes from the gas-liquid separator gas outlet 10 of the gas-liquid separator 8 into the drying box of the subsequent drying process, and the liquid flows from the gas-liquid separator liquid outlet 11 to the liquid storage tank; gas-liquid separation is achieved. After the vacuum pumping device 7 is turned on, the negative pressure it generates can accelerate the dichloromethane absorbed by the liquid absorbent material to penetrate into the inner core of the suction roller through the microporous gaps of the liquid absorbent material layer 4, thereby achieving the purpose of continuous and efficient liquid absorption.

[0021] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0022] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A device for removing liquid after extraction of lithium battery diaphragm, characterized in that: The invention comprises a liquid suction roller unit and a gas-liquid separation unit, wherein a vacuum liquid extraction unit is arranged between the liquid suction roller unit and the gas-liquid separation unit, and the vacuum liquid extraction unit is used to absorb liquid in the liquid suction roller unit when in use. The liquid suction roller unit comprises a first liquid suction roller (1) and a second liquid suction roller (2) arranged in parallel, wherein the circumferential outer surfaces of the first liquid suction roller (1) and the second liquid suction roller (2) are both provided with a plurality of liquid permeable holes (3) penetrating to the interior of the cavity, and the circumferential outer surfaces of the first liquid suction roller (1) and the second liquid suction roller (2) are both provided with a liquid absorption material layer (4) covering the liquid permeable holes (3).

2. The device for removing liquid after extraction of lithium battery diaphragm according to claim 1, characterized in that: The vacuum liquid extraction unit comprises a second vacuum liquid extraction pipeline (6) and a first vacuum liquid extraction pipeline (5) respectively connected to the inside of the cavities of the first liquid suction roller (1) and the second liquid suction roller (2); the end of the second vacuum liquid extraction pipeline (6) away from the first liquid suction roller (1) is connected to the first vacuum liquid extraction pipeline (5), and the end of the first vacuum liquid extraction pipeline (5) away from the second liquid suction roller (2) is connected to the vacuum liquid extraction device (7).

3. The device for removing liquid after extraction of lithium battery diaphragm according to claim 2, characterized in that: The gas-liquid separation unit comprises a gas-liquid separator (8) and a gas-liquid separator inlet (9) which is arranged on the circumferential outer surface of the gas-liquid separator (8) near the top and connected to the vacuum liquid extraction device (7); a gas-liquid separator gas outlet (10) is installed on the top of the gas-liquid separator (8); and a gas-liquid separator liquid outlet (11) is installed on the circumferential outer surface of the gas-liquid separator (8) near the bottom.

4. The device for removing liquid after extraction of lithium battery diaphragm according to claim 3, characterized in that: A separation layer (12) is provided inside the cavity of the gas-liquid separator (8) at a position below the gas-liquid separator inlet (9) and above the gas-liquid separator liquid outlet (11), and the interior of the separation layer (12) is filled with a wire mesh filler (13).

5. The device for removing liquid after extraction of lithium battery diaphragm according to claim 1, characterized in that: The liquid-absorbing material layer (4) is specifically a polymer fiber material layer.

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