CN113967365A - Extraction decontamination method and device for lithium battery diaphragm - Google Patents
Extraction decontamination method and device for lithium battery diaphragm Download PDFInfo
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- CN113967365A CN113967365A CN202111150624.8A CN202111150624A CN113967365A CN 113967365 A CN113967365 A CN 113967365A CN 202111150624 A CN202111150624 A CN 202111150624A CN 113967365 A CN113967365 A CN 113967365A
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- Prior art keywords
- diaphragm
- ultrasonic
- extraction
- ultrasonic vibration
- lithium battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/02—Solvent extraction of solids
- B01D11/0261—Solvent extraction of solids comprising vibrating mechanisms, e.g. mechanical, acoustical
- B01D11/0265—Applying ultrasound
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses an extraction decontamination method and device for a lithium battery diaphragm, and the extraction decontamination device for the lithium battery diaphragm comprises an ultrasonic vibration box and an ultrasonic generator which are respectively arranged inside and outside a drying furnace, wherein the ultrasonic generator is electrically connected with the ultrasonic vibration box through a lead, the ultrasonic vibration box is positioned in dichloromethane liquid of the drying furnace and positioned at the front side and the back side of the diaphragm, the number of the ultrasonic vibration boxes at the front side and the back side of the diaphragm is equal, an ultrasonic transducer in the ultrasonic vibration box faces the diaphragm, a support is arranged in the drying furnace, the ultrasonic vibration box is arranged on the support, and a gap is formed between the bottom surface of the ultrasonic vibration box and the bottom surface of the drying furnace. The invention mainly utilizes the disturbance effect, high acceleration, diffusion and stirring action of ultrasonic waves to improve the extraction effect and reduce the defects of the membrane surface, and promotes the paraffin oil in the aperture of the diaphragm to be quickly extracted, thereby improving the extraction efficiency of dichloromethane.
Description
Technical Field
The invention relates to an extraction decontamination method and device for a lithium battery diaphragm, and belongs to the technical field of lithium battery diaphragm production.
Background
In the current production of lithium battery diaphragms, the linear speed of a production line is about 45m/min, the equipment running condition of the production line is good, and abnormal conditions do not exist. However, with the rapid rise of the new energy automobile industry, the demand of the diaphragm is increased, and compared with the demand of the diaphragm in 2020 and 2021, the demand of the diaphragm is increased by 15% at the same time, and the number of defects of the current diaphragm is large, and about 100 diaphragms per parent roll, the quality of the diaphragm cannot meet the current customer demand. Extraction is an important step in diaphragm production, the number of defects on the surface of a diaphragm is determined by the extraction step, once the running speed of a production line is increased, the temperature of dichloromethane liquid in the extraction step needs to be increased, and the consumption of dichloromethane is increased; and the operating speed of the production line is increased, so that the contact time of the diaphragm and the extraction liquid is short, the extraction is not thorough, the residual extraction liquid on the diaphragm surface is not completely removed, and the film surface defects of the product are increased.
Disclosure of Invention
The invention aims to provide an extraction decontamination method and device for a lithium battery diaphragm, which are used for solving the technical problems that the dichloromethane consumption is increased and the number of product defects is increased after the operation speed of a diaphragm production line in the prior art is increased.
The extraction decontamination method of the lithium battery diaphragm adopts the following technical scheme: the utility model provides a lithium battery diaphragm's extraction scrubbing method, is located the positive and negative both sides position of diaphragm and sets up ultrasonic wave in the dichloromethane liquid of drying furnace and shakes the box respectively, when the diaphragm passes through in the dichloromethane liquid, opens the ultrasonic wave and shakes the box, and every ultrasonic wave shakes the box and all launches the ultrasonic wave towards the diaphragm, makes dichloromethane liquid keep the flow state, promotes paraffin oil in the diaphragm hole and extract dichloromethane mutually soluble.
The ultrasonic frequency is 2.5 KHz.
The extraction decontamination device for the lithium battery diaphragm adopts the following technical scheme: the utility model provides a lithium battery diaphragm's extraction scrubbing device, its is including setting up ultrasonic wave vibrations box and the supersonic generator inside and outside the drying furnace respectively, and supersonic generator shakes the box with the ultrasonic wave and passes through the wire electricity to be connected, the ultrasonic wave shakes the box and is located the dichloromethane liquid of drying furnace and is located the positive and negative both sides position of diaphragm, and the quantity that the box was shaken to the ultrasonic wave of the positive and negative both sides of diaphragm equals, and ultrasonic transducer in the ultrasonic wave shakes the box is towards the diaphragm, be equipped with the support in the drying furnace, the ultrasonic wave shakes the box and installs on the support, and there is the interval between the bottom surface of ultrasonic wave vibrations box and the bottom surface of drying furnace.
The number of the ultrasonic vibration boxes is equal to that of the ultrasonic generators, and each ultrasonic generator is connected with one ultrasonic generator through a lead.
And a stainless steel corrugated pipe is sleeved outside the lead between the ultrasonic vibration box and the ultrasonic generator.
The ultrasonic seismic boxes on each side of the diaphragm are uniformly distributed at intervals in the width direction of the diaphragm.
The number of the ultrasonic vibration boxes on each side of the diaphragm is three respectively.
The length, width and height of the ultrasonic seismic box are L900W 150H 85 mm.
The ultrasonic vibration drying furnace is characterized in that the number of the supports is two, the two sets of supports are respectively located on the front side and the back side of the diaphragm, each set of supports comprises a guide rail and a sliding block, the guide rail is horizontally arranged, the sliding block is slidably mounted on the guide rail, the guide rail is fixed in the drying furnace and is parallel to the diaphragm, and a connecting rod fixedly connected with the ultrasonic vibration box is fixed on the sliding block.
The power of each ultrasonic generator is 1.14KW, and the frequency of the ultrasonic waves emitted by each ultrasonic vibration box is 2.5 KHz.
The invention has the beneficial effects that: the invention mainly utilizes the disturbance effect, high acceleration, diffusion and stirring action of ultrasonic waves to improve the extraction effect and reduce the film surface defects, and the specific principle is as follows: (1) when the diaphragm passes through dichloromethane liquid, the ultrasonic wave can promote dichloromethane to flow rapidly, and paraffin oil in the pore diameter is extracted rapidly through the aperture of the diaphragm, so that the extraction efficiency of dichloromethane is improved, the oil content of the diaphragm is reduced, the air permeability of a product is improved, and the requirement of a high-quality diaphragm is met; (2) the dichloromethane liquid is kept in a flowing state by utilizing high stirring and diffusion effects of ultrasonic waves, and tiny defects formed by accumulation and adhesion of impurities remained on the liquid surface on the surface of the diaphragm are avoided, so that the number of the defects on the diaphragm surface of the diaphragm is reduced, and the yield and the quality of products are improved; (3) the liquid temperature of dichloromethane in the drying furnace can be raised by utilizing the heat effect of ultrasonic waves, so that the film surface scratch and the like caused by icing of the roller surface due to lower weather temperature in winter are avoided, and the influence on the product yield and the quality is avoided.
After the method is used, the operation speed of the production line is increased, the consumption of dichloromethane cannot be increased, the number of film surface defects is reduced, the method not only solves the problem of film surface defects, but also lays a solid foundation for increasing the speed and the productivity of the production line, is an indispensable prerequisite for increasing the speed of the production line, and has the following application benefits: (1) the application of the invention can promote the production energy and technology of the diaphragm production line, obviously reduce the film surface defects of the product and obviously improve the quality; (2) the application development of the invention lays a foundation for increasing the production line speed, improving the productivity, better meeting the market demand and quickly promoting the enterprise development; (3) the invention can improve the marking of the film-making technology and the defect detection standard, improve the product quality, meet the requirement of customers on high product quality, better expand the market and improve the enterprise competitiveness.
Drawings
Fig. 1 is a schematic structural diagram of an extraction decontamination apparatus for a lithium battery separator according to an embodiment of the invention.
In the figure: 1-drying oven, 2-ultrasonic vibration box, 3-bracket, 31-slide rail, 32-slide block and 33-connecting rod.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The invention discloses an extraction decontamination method of a lithium battery diaphragm, which is characterized in that ultrasonic vibration boxes are respectively arranged at the front side and the back side of the diaphragm in dichloromethane liquid of a drying furnace, three ultrasonic vibration boxes are respectively arranged at the front side and the back side of the diaphragm, the frequency of ultrasonic waves emitted by each ultrasonic vibration box is 2.5KHz, when the diaphragm passes through the dichloromethane liquid, the ultrasonic vibration boxes are opened, each ultrasonic vibration box emits ultrasonic waves towards the diaphragm, the dichloromethane liquid is kept in a flowing state, and paraffin oil in the pores of the diaphragm and extraction liquid dichloromethane are promoted to be mutually dissolved.
The extraction and decontamination device for the lithium battery diaphragm comprises an ultrasonic vibration box 2 and an ultrasonic generator (not shown) which are respectively arranged inside and outside a drying furnace 1, wherein the ultrasonic generator is electrically connected with the ultrasonic vibration box 2 through a lead (not shown), the ultrasonic vibration box 2 is positioned in dichloromethane liquid of the drying furnace 1 and positioned at the front side and the back side of the diaphragm, so that each ultrasonic vibration box 2 emits ultrasonic waves towards the diaphragm, the number of the ultrasonic vibration boxes 2 at the front side and the back side of the diaphragm is equal, an ultrasonic transducer in each ultrasonic vibration box 2 faces the diaphragm, a support 3 is arranged in the drying furnace 1, the ultrasonic vibration boxes 2 are arranged on the support, and an interval is formed between the bottom surface of each ultrasonic vibration box 2 and the bottom surface of the drying furnace 1.
In this embodiment, the number of the ultrasonic vibration boxes 3 is equal to that of the ultrasonic generators, and three ultrasonic vibration boxes 2 are respectively arranged on each side of the diaphragm. Each ultrasonic generator is respectively connected with one ultrasonic generator through a lead, and a stainless steel corrugated pipe (not shown in the attached drawing) is sleeved outside the lead between the ultrasonic vibration box and the ultrasonic generator. The ultrasonic seismic boxes 2 on each side of the diaphragm are evenly spaced in the width direction of the diaphragm.
The length, width, height and size of each ultrasonic vibration box 2 are L900W 150H 85mm, the power of each ultrasonic generator is 1.14KW, the weight is 21KG, and the frequency of ultrasonic waves emitted by each ultrasonic vibration box 2 is 2.5 KHz.
The support 3 has two sets ofly, and two sets of supports 3 are located the positive and negative both sides of diaphragm respectively, and every group support 3 all includes the guide rail 31 and the slider 32 of slidable mounting on guide rail 31 that the level set up, and guide rail 31 is fixed in drying furnace 1 and is on a parallel with the diaphragm, is fixed with the connecting rod 33 with ultrasonic wave shake box fixed connection on the slider 32.
The ultrasonic vibration boxes are additionally arranged below the dichloromethane liquid level of the drying furnace of the extraction system, the ultrasonic vibration boxes are arranged on the front side and the back side of the diaphragm, the drying furnace is internally provided with a support, a guide rail on the support is positioned above the liquid level of the extraction liquid, the guide rail is used as a bearing cross bar and can bear the weight of the ultrasonic vibration boxes, the position of the ultrasonic vibration boxes can be changed by moving a sliding block on the guide rail, and finally, the front side and the back side of the diaphragm are respectively and uniformly provided with the three ultrasonic vibration boxes in a suspension type mode.
The wire between the ultrasonic vibration box and the ultrasonic generator is protected by an SUS316 stainless steel corrugated pipe to prevent the ultrasonic generator from being influenced by the extraction liquid, the ultrasonic generator is placed outside the drying furnace, when the ultrasonic generator works, ultrasonic waves which vibrate towards the diaphragm are emitted in the ultrasonic vibration box, and the frequency and the speed of the molecular motion of a substance are increased by utilizing the multi-stage effects such as strong mechanical vibration, disturbance effect, high acceleration, diffusion, stirring action and the like generated by ultrasonic radiation pressure, so that the penetrating power of a solvent is increased, the target components are accelerated to enter the solvent, the mature extraction technology for extraction is promoted, namely, the paraffin oil in the diaphragm pores and the extraction liquid dichloromethane are quickly mutually dissolved in the diaphragm extraction process, and the extraction efficiency is improved by the multi-stage effects such as high-speed vibration, diffusion and the like. The ultrasonic vibration boxes on the front side and the back side of the diaphragm generate bidirectional vibration, so that the extraction effect can be improved, and the stress balance of the diaphragm surface can be ensured. And in the production line operation process, performing ultrasonic vibration box appearance cleaning according to a conventional maintenance plan.
The method can solve the problem that the efficiency is difficult to improve when the design capacity of the production line is in a bottleneck state, the quality and the efficiency are stably improved while the safety risk is reduced in the speed-up process of the production line, and the industry competitiveness of an enterprise is enhanced, and the method is specifically represented as follows:
the quality is stably improved: the problem of defects such as bright spots and stains on the membrane surface caused by poor drying effect of an extraction system is solved by adding an ultrasonic vibration box, the tiny defects (less than or equal to 0.1 mm) of the membrane produced by the prior art are about 100, and the production line speed is about 45 m/min; by using the method, the tiny defects (less than or equal to 0.1 mm) are reduced by about 50%, and the product quality is improved to a higher degree.
Secondly, the productivity and efficiency are improved: the defect quantity of the prior art is about 100 per mother coil under the speed of a production line (45 m/min), the extraction time is reduced along with the speed increase of the production line, the defect quantity is difficult to control, the extraction efficiency can be greatly improved by increasing the ultrasonic vibration box, the speed of the production line is increased to 50m/min, the productivity is improved by 12.5 percent, and the strict control of the defect quantity can be realized, so that the annual output value is increased by 7.5 percent.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It is obvious that the present invention is not limited to the following embodiments, but many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (10)
1. An extraction decontamination method of a lithium battery diaphragm is characterized in that: the positive and negative both sides position that lies in the diaphragm in the dichloromethane liquid of drying furnace sets up the ultrasonic wave respectively and shakes the box, when the diaphragm passes through in the dichloromethane liquid, opens the ultrasonic wave and shakes the box, and every ultrasonic wave shakes the box and all launches the ultrasonic wave towards the diaphragm, makes dichloromethane liquid keep the flow state, promotes paraffin oil in the diaphragm hole and extracts dichloromethane mutually soluble.
2. The extraction decontamination method for a lithium battery separator according to claim 1, characterized in that: the ultrasonic frequency is 2.5 KHz.
3. The utility model provides a lithium battery diaphragm's extraction scrubbing device which characterized in that: the drying furnace comprises an ultrasonic vibration box and an ultrasonic generator which are arranged inside and outside the drying furnace respectively, wherein the ultrasonic generator is electrically connected with the ultrasonic vibration box through a wire, the ultrasonic vibration box is located in dichloromethane liquid of the drying furnace and located on the front side and the back side of a diaphragm, the number of the ultrasonic vibration boxes on the front side and the back side of the diaphragm is equal, an ultrasonic transducer in the ultrasonic vibration box faces the diaphragm, a support is arranged in the drying furnace, the ultrasonic vibration box is installed on the support, and a gap is reserved between the bottom surface of the ultrasonic vibration box and the bottom surface of the drying furnace.
4. The extraction decontamination device for a lithium battery separator according to claim 3, wherein: the number of the ultrasonic vibration boxes is equal to that of the ultrasonic generators, and each ultrasonic generator is connected with one ultrasonic generator through a lead.
5. The extraction decontamination device for a lithium battery separator according to claim 3, wherein: and a stainless steel corrugated pipe is sleeved outside the lead between the ultrasonic vibration box and the ultrasonic generator.
6. The extraction decontamination device for a lithium battery separator according to claim 3, wherein: the ultrasonic seismic boxes on each side of the diaphragm are uniformly distributed at intervals in the width direction of the diaphragm.
7. The extraction decontamination device for a lithium battery separator according to claim 3, wherein: the number of the ultrasonic vibration boxes on each side of the diaphragm is three respectively.
8. The extraction decontamination device for a lithium battery separator according to claim 3, wherein: the length, width and height of the ultrasonic seismic box are L900W 150H 85 mm.
9. The extraction decontamination device for a lithium battery separator according to claim 3, wherein: the ultrasonic vibration drying furnace is characterized in that the number of the supports is two, the two sets of supports are respectively located on the front side and the back side of the diaphragm, each set of supports comprises a guide rail and a sliding block, the guide rail is horizontally arranged, the sliding block is slidably mounted on the guide rail, the guide rail is fixed in the drying furnace and is parallel to the diaphragm, and a connecting rod fixedly connected with the ultrasonic vibration box is fixed on the sliding block.
10. The extraction decontamination device for a lithium battery separator according to claim 3, wherein: the power of each ultrasonic generator is 1.14KW, and the frequency of the ultrasonic waves emitted by each ultrasonic vibration box is 2.5 KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111150624.8A CN113967365A (en) | 2021-09-29 | 2021-09-29 | Extraction decontamination method and device for lithium battery diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111150624.8A CN113967365A (en) | 2021-09-29 | 2021-09-29 | Extraction decontamination method and device for lithium battery diaphragm |
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| CN113967365A true CN113967365A (en) | 2022-01-25 |
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| CN202111150624.8A Withdrawn CN113967365A (en) | 2021-09-29 | 2021-09-29 | Extraction decontamination method and device for lithium battery diaphragm |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005239773A (en) * | 2004-02-24 | 2005-09-08 | Nitto Denko Corp | Method for producing porous film |
| CN103840113A (en) * | 2014-02-28 | 2014-06-04 | 苏州捷力新能源材料有限公司 | Preparation method of polyethylene isolation membrane for lithium batteries |
| CN104993085A (en) * | 2015-05-22 | 2015-10-21 | 宁波大学 | Multilayer composite polyolefin lithium ion battery diaphragm and production method thereof |
| CN208553214U (en) * | 2018-07-09 | 2019-03-01 | 安徽新衡新材料科技有限公司 | A kind of extracting system for the production of wet process lithium ion battery separator |
| CN110048055A (en) * | 2018-01-16 | 2019-07-23 | 溧阳月泉电能源有限公司 | A kind of production method and system of lithium ion secondary battery membrane |
-
2021
- 2021-09-29 CN CN202111150624.8A patent/CN113967365A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005239773A (en) * | 2004-02-24 | 2005-09-08 | Nitto Denko Corp | Method for producing porous film |
| CN103840113A (en) * | 2014-02-28 | 2014-06-04 | 苏州捷力新能源材料有限公司 | Preparation method of polyethylene isolation membrane for lithium batteries |
| CN104993085A (en) * | 2015-05-22 | 2015-10-21 | 宁波大学 | Multilayer composite polyolefin lithium ion battery diaphragm and production method thereof |
| CN110048055A (en) * | 2018-01-16 | 2019-07-23 | 溧阳月泉电能源有限公司 | A kind of production method and system of lithium ion secondary battery membrane |
| CN208553214U (en) * | 2018-07-09 | 2019-03-01 | 安徽新衡新材料科技有限公司 | A kind of extracting system for the production of wet process lithium ion battery separator |
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Application publication date: 20220125 |
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| WW01 | Invention patent application withdrawn after publication |