CN113750567A - Water circulation system and method for lithium battery diaphragm extraction - Google Patents
Water circulation system and method for lithium battery diaphragm extraction Download PDFInfo
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- CN113750567A CN113750567A CN202111310694.5A CN202111310694A CN113750567A CN 113750567 A CN113750567 A CN 113750567A CN 202111310694 A CN202111310694 A CN 202111310694A CN 113750567 A CN113750567 A CN 113750567A
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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
- B01D11/028—Flow sheets
- B01D11/0284—Multistage extraction
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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
- B01D11/0207—Control systems
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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
- B01D11/028—Flow sheets
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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 belongs to the technical field of lithium battery diaphragm production, and particularly relates to a water circulation system and method for lithium battery diaphragm extraction. This water circulating system for lithium battery diaphragm extraction includes: a control module; the multi-stage water washing subsystems are sequentially arranged along the conveying direction of the diaphragm and are used for sequentially carrying out multi-stage water washing on the diaphragm; a concentration adjustment subsystem; and when the concentration of the substances extracted from the previous-stage water washing subsystem exceeds a preset value, the control module controls the concentration regulating subsystem to add the process water in the next-stage water washing subsystem into the previous-stage water washing subsystem. The water circulation system for lithium battery diaphragm extraction has the beneficial effects that the water circulation system for lithium battery diaphragm extraction is provided with a multi-stage water washing subsystem, and can be used for sequentially carrying out multi-stage water washing on the diaphragm; the concentration adjusting subsystem can add the process water in the next-stage washing subsystem into the previous-stage washing subsystem for dilution when the concentration of the substances extracted from the previous-stage washing subsystem exceeds a preset value, so as to adjust the concentration and save resources.
Description
Technical Field
The invention belongs to the technical field of lithium battery diaphragm production, and particularly relates to a water circulation system and method for lithium battery diaphragm extraction.
Background
The production process of the lithium battery diaphragm is complex, and the production process has high technical barrier and great research and development difficulty due to the fact that various characteristics and performance indexes of the lithium battery diaphragm are difficult to be considered. The membrane process can be divided into a dry process and a wet process according to the difference of pore-forming mechanisms of micropores. The wet process is to mix the plasticizer and the polyolefin resin by utilizing the principle of thermally induced phase separation, to utilize the phenomenon of solid-liquid phase or liquid-liquid phase separation in the process of cooling the molten mixture, to press a membrane, to heat to the temperature close to the melting point, to stretch to make the molecular chain orientation consistent, to keep the temperature for a certain time, to extract the plasticizer from the membrane by using a volatile solvent, and to prepare the mutually communicated submicron-sized microporous membrane material.
Therefore, a system for extracting and forming pores on the lithium battery diaphragm is needed.
Disclosure of Invention
The invention aims to provide a water circulation system and a method for lithium battery diaphragm extraction.
In order to solve the technical problem, the invention provides a water circulation system for lithium battery diaphragm extraction, which comprises: a control module; the multi-stage water washing subsystems are sequentially arranged along the conveying direction of the diaphragm and are used for sequentially carrying out multi-stage water washing on the diaphragm; a concentration adjustment subsystem; and when the concentration of the substances extracted from the previous-stage water washing subsystem exceeds a preset value, the control module controls the concentration regulating subsystem to add the process water in the next-stage water washing subsystem into the previous-stage water washing subsystem.
Further, the water washing subsystem comprises: the washing tank, the buffer tank, the water feeding pipe, the return pipe and the circulating pump positioned on the water feeding pipe; the circulating pump adds the water in the buffer tank into the rinsing tank through the water adding pipe; the backflow pipe flows the water overflowing from the rinsing tank back to the buffer tank; namely, the rinsing bath and the buffer bath carry out process water circulation through a water feeding pipe, a return pipe and a circulating pump.
Further, the concentration adjustment subsystem includes: the concentration detection modules are respectively used for detecting the concentrations of substances extracted from the corresponding water washing subsystems; the concentration regulating pipes are respectively used for connecting the buffer tank of the upper-stage washing subsystem and the buffer tank of the lower-stage washing subsystem; and a concentration regulating valve positioned on each concentration regulating pipe; when the concentration detection module of the previous-stage water washing subsystem detects that the concentration of the extracted substances exceeds a preset value, the control module controls the corresponding concentration regulating valve to be opened, and the circulating pump adds the process water in the buffer tank of the next-stage water washing subsystem into the buffer tank of the previous-stage water washing subsystem.
Furthermore, the water circulation system comprises a process water pipe for adding process water into the buffer tank of each water washing subsystem for the first time; when the concentration detection module of the final-stage water washing subsystem detects that the concentration of the extracted substances exceeds a preset value, the control module controls a corresponding water adding valve on the process water pipe to be opened, and process water is added into the buffer tank of the final-stage water washing subsystem to adjust the concentration.
Further, the water circulation system further includes: a temperature regulation subsystem; when the temperature in the rinsing bath is out of the preset process temperature range, the control module controls the temperature adjusting subsystem to adjust the temperature of the corresponding process water in the buffer tank so as to adjust the temperature in the corresponding rinsing bath to be within the preset process temperature range.
Further, the temperature adjustment subsystem includes: a cold water tray and a hot water tray respectively positioned in each buffer tank; the temperature detection modules are respectively positioned in the rinsing tanks; the cold water circulating pipe group is communicated with the cold water trays in the buffer grooves; the hot water circulating pipe group is communicated with the hot water discs in the buffer grooves; the cold water control valve group and the hot water control valve group are in one-to-one correspondence with the cold water tray and the hot water tray of each buffer tank; the control module is suitable for adjusting the temperature in the corresponding buffer tank by controlling the cold water control valve group and/or the hot water control valve group of the corresponding buffer tank according to the temperature value sent by the temperature detection module.
Furthermore, the water circulation system also comprises a waste liquid tank which is used for collecting the ultra-concentration process water discharged from the buffer tank of the first-stage water washing subsystem.
Further, the water circulation system also comprises a low-concentration process water collecting tank; and the low-concentration process water collecting tank is communicated with the buffer tanks of the washing subsystems except the first-stage washing subsystem through collecting pipes and is communicated with the buffer tank of the first-stage washing subsystem through a low-concentration water adding pipe.
Furthermore, a self-circulating pipe communicated with the buffer tank is also arranged on the water adding pipe.
In another aspect, the invention also provides a water circulation method for lithium battery diaphragm extraction, comprising the following steps: when the concentration of the substances extracted from the previous-stage water washing subsystem exceeds a preset value, the control module controls the concentration regulating subsystem to add the process water in the next-stage water washing subsystem into the previous-stage water washing subsystem.
The water circulation system for lithium battery diaphragm extraction has the beneficial effects that the water circulation system for lithium battery diaphragm extraction is provided with a multi-stage water washing subsystem, and can be used for sequentially carrying out multi-stage water washing on the diaphragm; the concentration adjusting subsystem can add the process water in the next-stage washing subsystem into the previous-stage washing subsystem for dilution when the concentration of the substances extracted from the previous-stage washing subsystem exceeds a preset value, so as to adjust the concentration and save resources.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a water circulation system for lithium battery separator extraction according to the present invention;
FIG. 2 is a schematic diagram of a temperature regulation subsystem of the water circulation system for lithium battery separator extraction of the present invention;
FIG. 3 is a control schematic diagram of a water circulation system for lithium battery separator extraction according to the present invention.
In the figure:
the water washing subsystem 1, the water washing tank 11, the buffer tank 12, the water feeding pipe 13, the return pipe 14, the circulating pump 15 and the self-circulating pipe 16;
a concentration adjusting pipe 21 and a concentration adjusting valve 22;
a process water pipe 3;
a temperature adjusting subsystem 4, a cold water tray 41, a hot water tray 42, a cold water circulating pipe group 43, a hot water circulating pipe group 44, a cold water control valve group 45 and a hot water control valve group 46;
a waste liquid tank 5;
a low concentration process water collecting tank 6, a collecting pipe 61 and a low concentration water adding pipe 62.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the process of producing the lithium battery diaphragm by the wet method, after the lithium battery diaphragm is subjected to oil coating, oil slurry PVDF or ceramic + NMP or DMAC (solvent) is used for washing and extracting the coated diaphragm, and the NMP or DMAC solvent can be hydrolyzed to form micropores so as to finish pore forming of the diaphragm.
As shown in fig. 1, the present invention provides a water circulation system for lithium battery separator extraction, comprising: a control module; the multi-stage water washing subsystems 1 are sequentially arranged along the conveying direction of the diaphragm and are used for sequentially carrying out multi-stage water washing on the diaphragm; a concentration adjustment subsystem; when the concentration of the substances extracted from the previous-stage water washing subsystem 1 exceeds a preset value, the control module controls the concentration regulation subsystem to add the process water in the next-stage water washing subsystem 1 into the previous-stage water washing subsystem 1 so as to regulate the concentration.
In the embodiment, the multistage water washing subsystem 1 can sequentially carry out multistage water washing on the diaphragm, and carry out extraction pore-forming and cleaning on the diaphragm; because the multi-stage water washing subsystems 1 are sequentially arranged along the conveying direction of the diaphragm, the concentration of substances extracted from the first-stage water washing subsystem 1 is highest, and the concentration of subsequent stages is sequentially decreased, so that in order to save water resources, the concentration adjusting subsystem can add process water in the next-stage water washing subsystem 1 into the previous-stage water washing subsystem 1 for dilution when the concentration of substances extracted from the previous-stage water washing subsystem 1 exceeds a preset value, so as to adjust the concentration.
In this embodiment, preferably, the water washing subsystem 1 includes: a rinsing tank 11, a buffer tank 12, a water feeding pipe 13, a return pipe 14 and a circulating pump 15 positioned on the water feeding pipe 13; the circulating pump 15 adds the water in the buffer tank 12 into the rinsing tank 11 through the water adding pipe 13; the return pipe 14 returns the water overflowed from the rinsing tank 11 to the buffer tank 12; namely, the rinsing tank 11 and the buffer tank 12 circulate the process water through the water feed pipe 13, the return pipe 14 and the circulation pump 15.
In this embodiment, by providing the buffer tanks 12 for performing water circulation with the respective rinsing tanks 11, the rinsing tanks 11 can be adjusted in process parameters such as temperature and concentration through the buffer tanks 12, so that the diaphragm conveying mechanism can be conveniently arranged in the rinsing tanks 11, and the structure for adjusting the process parameters such as temperature and concentration does not occupy the space of the rinsing tanks 11; and the technological parameters such as temperature, concentration and the like firstly reach the standard in the buffer tank 12, and the debugging process can not influence the diaphragm in the rinsing tank 11.
In this embodiment, it is preferable that the concentration adjustment subsystem includes: the concentration detection module is respectively used for detecting the concentration of substances extracted from the corresponding water washing subsystem 1; the concentration adjusting pipes 21 are respectively used for connecting the buffer tank 12 of the upper-stage washing subsystem 1 and the buffer tank 12 of the lower-stage washing subsystem 1; and a concentration adjusting valve 22 provided on each concentration adjusting pipe 21; when the concentration detection module of the previous-stage water washing subsystem 1 detects that the concentration of the extracted substances exceeds the preset value, the control module controls the corresponding concentration regulating valve 22 to be opened, and the circulating pump 15 adds the process water in the buffer tank 12 of the next-stage water washing subsystem 1 into the buffer tank 12 of the previous-stage water washing subsystem 1.
In an application scenario, the concentration detection module may be disposed on the water feeding pipe 13; the concentration adjusting pipe 21 can be connected with the buffer tank 12 of the previous-stage washing subsystem 1 and the water adding pipe 13 of the next-stage washing subsystem 1; when the concentration of the extracted substances detected by the concentration detection module of the previous stage exceeds the preset value, the control module controls the corresponding concentration regulating valve 22 to be opened, and the water adding pipe 13 of the water washing subsystem 1 of the next stage adds relatively low-concentration process water in the buffer tank 12 of the water washing subsystem 1 of the next stage into the buffer tank 12 of the water washing subsystem 1 of the previous stage, so that the purposes of diluting and regulating the concentration can be achieved.
Certainly, in an application scenario, a liquid level detection module may be further disposed in each buffer tank 12, when the liquid level in the buffer tank 12 is lower than a preset value, the control module controls the corresponding concentration adjusting valve 22 to open, and the water feeding pipe 13 of the next-stage water washing subsystem 1 feeds relatively low-concentration process water in the buffer tank 12 of the next-stage water washing subsystem 1 into the buffer tank 12 of the previous-stage water washing subsystem 1, so as to achieve the purpose of supplementing the process water.
In this embodiment, the water circulation system further includes a process water pipe 3 for adding process water to the buffer tank 12 of each water washing subsystem 1 for the first time before performing membrane extraction; and when the concentration detection module of the final stage water washing subsystem 1 detects that the concentration of the extracted substances exceeds a preset value, the control module controls a corresponding water adding valve on the process water pipe 3 to be opened, and process water is added into the buffer tank 12 of the final stage water washing subsystem 1 to adjust the concentration.
Because the membrane extraction needs to be performed within a certain temperature range, in this embodiment, the water circulation system further includes: a temperature regulation subsystem 4; when the temperature in the rinsing bath 11 is out of the preset process temperature range, the control module controls the temperature adjusting subsystem 4 to adjust the temperature of the process water in the corresponding buffer tank 12 so as to adjust the temperature in the corresponding rinsing bath 11 to the preset process temperature range.
As shown in fig. 2, in the present embodiment, as a preferred embodiment of the temperature adjustment subsystem 4, the temperature adjustment subsystem 4 includes: a cold water tray 41 and a hot water tray 42 respectively located in each buffer tank 12; temperature detection modules respectively positioned in the rinsing tanks 11; a cold water circulating pipe group 43 communicating with the cold water tray 41 in each buffer tank 12; a hot water circulation pipe group 44 communicating with the hot water tray 42 in each buffer tank 12; and a cold water control valve group 45 and a hot water control valve group 46 corresponding to the cold water tray 41 and the hot water tray 42 of each buffer tank 12 one to one; the control module is adapted to regulate the temperature in the corresponding buffer tank 12 by controlling the cold water control valve group 45 and/or the hot water control valve group 46 of the corresponding buffer tank 12 according to the temperature value sent by the temperature detection module.
In an application scenario, when the temperature in the rinsing tank 11 is lower than the preset value, the control module controls the hot water control valve set 46 to be opened, and the hot water circulating pipe set 44 supplies hot water to the hot water tray 42 to heat the process water in the buffer tank 12; when the temperature in the rinsing tank 11 is higher than the preset value, the control module controls the cold water control valve group 45 to open, and the cold water circulating pipe group 43 supplies cooling water to the cold water tray 41 to cool the process water in the buffer tank 12.
In the embodiment, the adjusting method is simple and convenient, can realize on-line adjustment, can stabilize the process temperature in a specified interval, and improves the process production efficiency.
In this embodiment, the water circulation system further comprises a waste liquid tank 5 for collecting the super-concentration process water discharged from the buffer tank 12 of the first-stage water washing subsystem 1; because the concentration of the buffer tank 12 of the first-stage water washing subsystem 1 exceeds the standard, process water in the buffer tank needs to be discharged firstly to have space for accommodating subsequent dilution water, and the waste liquid tank 5 can be used for collecting the over-concentration waste water.
In this embodiment, preferably, the water circulation system further comprises a low concentration process water collection tank 6; the low-concentration process water collecting tank 6 is communicated with the buffer tanks 12 of the washing subsystems 1 except the first-stage washing subsystem 1 through a collecting pipe 61, and is communicated with the buffer tanks 12 of the first-stage washing subsystem 1 through a low-concentration water adding pipe 62.
In an application scenario, when a certain water washing subsystem 1 breaks down and needs to be overhauled, the low-concentration process water collecting tank 6 can be used for storing process water in a fault tank, and the collected process water can be used as dilution water for the buffer tank 12 of the first-stage water washing subsystem 1.
In this embodiment, it is preferable that the water feeding pipe 13 is further provided with a self-circulation pipe 16 communicating with the buffer tank 12.
In an application scenario, when the rinsing tank 11 of a certain rinsing subsystem 1 breaks down and needs to be repaired, a valve on the self-circulation pipe 16 can be opened, and the buffer tank 12 realizes self-circulation through the water feeding pipe 13 and the self-circulation pipe 16. Because the pipeline is generally provided with an electric valve and a manual valve, in order to reduce the workload of opening and closing the manual valve each time, the circulation of the buffer tank 12 and the rinsing tank 11 or the self-circulation of the buffer tank 12 can be realized only by the electric valve operation through the self-circulation design, and the operation is simple and convenient.
On the basis of the embodiment, the invention also provides a water circulation method for extracting the lithium battery diaphragm, which comprises the following steps: when the concentration of the substances extracted from the previous-stage water washing subsystem 1 exceeds a preset value, the control module controls the concentration regulating subsystem to add the process water in the next-stage water washing subsystem 1 into the previous-stage water washing subsystem 1.
In summary, the multistage water washing subsystem 1 of the water circulation system for lithium battery diaphragm extraction can sequentially carry out multistage water washing on the diaphragm, and carry out extraction pore-forming and cleaning on the diaphragm; the concentration adjusting subsystem and the temperature adjusting subsystem 4 can realize the on-line adjustment of the process parameters and realize the continuous production; by arranging the buffer tanks 12 which perform water circulation with the rinsing tanks 11, the rinsing tanks 11 can be adjusted in technological parameters such as temperature and concentration through the buffer tanks 12, a diaphragm conveying mechanism can be conveniently arranged in the rinsing tanks 11, and the structures for adjusting the technological parameters such as temperature and concentration do not occupy the space of the rinsing tanks 11; and the technological parameters such as temperature, concentration and the like firstly reach the standard in the buffer tank 12, and the debugging process can not influence the diaphragm in the rinsing tank 11.
The components selected for use in the present application (components not illustrated for specific structures) are all common standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experimentation.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A lithium battery diaphragm extraction water circulation system, characterized by comprising:
a control module;
the multistage water washing subsystems (1) are sequentially arranged along the conveying direction of the diaphragm and are used for sequentially carrying out multistage water washing on the diaphragm;
a concentration adjustment subsystem;
when the concentration of the substances extracted from the previous-stage water washing subsystem (1) exceeds a preset value, the control module controls the concentration regulating subsystem to add the process water in the next-stage water washing subsystem (1) into the previous-stage water washing subsystem (1) so as to regulate the concentration.
2. The water circulation system of claim 1,
the water washing subsystem (1) comprises: a rinsing tank (11), a buffer tank (12), a water feeding pipe (13), a return pipe (14) and a circulating pump (15) positioned on the water feeding pipe (13);
the circulating pump (15) adds water in the buffer tank (12) into the rinsing tank (11) through the water adding pipe (13);
the backflow pipe (14) flows the water overflowed from the rinsing tank (11) back to the buffer tank (12); namely, it is
The rinsing tank (11) and the buffer tank (12) are used for circulating process water through a water feeding pipe (13), a return pipe (14) and a circulating pump (15).
3. The water circulation system of claim 2,
the concentration adjustment subsystem includes:
the concentration detection modules are respectively used for detecting the concentrations of substances extracted from the corresponding water washing subsystems (1);
the concentration adjusting pipes (21) are respectively used for connecting the buffer tank (12) of the upper-stage water washing subsystem (1) and the buffer tank (12) of the lower-stage water washing subsystem (1); and
a concentration adjusting valve (22) positioned on each concentration adjusting pipe (21);
when the concentration detection module of the previous-stage water washing subsystem (1) detects that the concentration of the extracted substances exceeds a preset value, the control module controls the corresponding concentration regulating valve (22) to be opened, and the circulating pump (15) adds the process water in the buffer tank (12) of the next-stage water washing subsystem (1) into the buffer tank (12) of the previous-stage water washing subsystem (1).
4. The water circulation system of claim 3,
the water circulation system comprises a process water pipe (3) which is used for adding process water into a buffer tank (12) of each water washing subsystem (1) for the first time;
when the concentration detection module of the final-stage water washing subsystem (1) detects that the concentration of the extracted substances exceeds a preset value, the control module controls a corresponding water adding valve on the process water pipe (3) to be opened, and process water is added into the buffer tank (12) of the final-stage water washing subsystem (1) to adjust the concentration.
5. The water circulation system of claim 2,
the water circulation system further includes:
a temperature regulation subsystem (4);
when the temperature in the rinsing bath (11) is out of the preset process temperature range, the control module controls the temperature adjusting subsystem (4) to adjust the temperature of the process water in the corresponding buffer tank (12) so as to adjust the temperature in the corresponding rinsing bath (11) to the preset process temperature range.
6. The water circulation system of claim 5,
the temperature regulation subsystem (4) comprises:
a cold water tray (41) and a hot water tray (42) respectively positioned in each buffer tank (12);
the temperature detection modules are respectively positioned in the rinsing tanks (11);
a cold water circulating pipe group (43) which is communicated with the cold water tray (41) in each buffer tank (12);
a hot water circulating pipe group (44) which is communicated with the hot water tray (42) in each buffer tank (12); and
cold water control valve groups (45) and hot water control valve groups (46) which correspond to the cold water trays (41) and the hot water trays (42) of the buffer tanks (12) one by one;
the control module is suitable for adjusting the temperature in the corresponding buffer tank (12) by controlling a cold water control valve group (45) and/or a hot water control valve group (46) of the corresponding buffer tank (12) according to the temperature value sent by the temperature detection module.
7. The water circulation system of claim 2,
the water circulation system also comprises a waste liquid tank (5) which is used for collecting the ultra-concentration process water discharged from the buffer tank (12) of the first-stage water washing subsystem (1).
8. The water circulation system of claim 2,
the water circulation system also comprises a low-concentration process water collecting tank (6);
the low-concentration process water collecting tank (6) is communicated with the buffer tanks (12) of all the washing subsystems (1) except the first-stage washing subsystem (1) through a collecting pipe (61) and is communicated with the buffer tanks (12) of the first-stage washing subsystem (1) through a low-concentration water adding pipe (62).
9. The water circulation system of claim 2,
the water feeding pipe (13) is also provided with a self-circulation pipe (16) communicated with the buffer tank (12).
10. A water circulation method for lithium battery diaphragm extraction is characterized by comprising the following steps:
when the concentration of the substances extracted from the previous-stage water washing subsystem (1) exceeds a preset value, the control module controls the concentration regulating subsystem to add the process water in the next-stage water washing subsystem (1) into the previous-stage water washing subsystem (1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115228695A (en) * | 2022-05-24 | 2022-10-25 | 中材锂膜有限公司 | Lithium cell oil is solidification of coating diaphragm equipment, washing solution concentration quick adjustment system |
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| US3622393A (en) * | 1968-03-12 | 1971-11-23 | Grace W R & Co | Continuous process for manufacturing microporous battery separators and battery separators made thereby |
| CN102677200A (en) * | 2012-05-22 | 2012-09-19 | 中国科学院山西煤炭化学研究所 | Polyacrylonitrile as-formed fiber rinsing bath and application |
| CN110098366A (en) * | 2015-11-13 | 2019-08-06 | 住友化学株式会社 | Nonaqueous electrolytic solution secondary battery diaphragm manufacturing method and nonaqueous electrolytic solution secondary battery septum purge device |
| CN207038603U (en) * | 2017-07-24 | 2018-02-23 | 河北金力新能源科技股份有限公司 | Extraction equipment during lithium ion cell film wet method preparation process |
| CN209312894U (en) * | 2018-12-29 | 2019-08-27 | 无锡启成新能源有限公司 | Lithium battery diaphragm solidification washing liquid-supplying system |
| CN209736197U (en) * | 2019-03-21 | 2019-12-06 | 威海威高血液净化制品有限公司 | Multistage series water washing device |
| CN113578686A (en) * | 2021-07-27 | 2021-11-02 | 中材锂膜有限公司 | Device for quickly adjusting concentration of solidification and washing solution during coating of diaphragm of lithium battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115228695A (en) * | 2022-05-24 | 2022-10-25 | 中材锂膜有限公司 | Lithium cell oil is solidification of coating diaphragm equipment, washing solution concentration quick adjustment system |
| CN115228695B (en) * | 2022-05-24 | 2023-06-23 | 中材锂膜有限公司 | Solidification and water washing solution concentration quick adjustment system of lithium battery oil system coating diaphragm equipment |
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