Drying system for thick edge of lithium battery diaphragm

Abstract

The utility model relates to a thick edge drying system for a lithium battery diaphragm. The drying mechanism is used for secondarily drying the thick edge part of the diaphragm so as to dry the dichloromethane liquid carried by the thick edge part of the diaphragm; the air supply mechanism is connected with the drying mechanism and used for supplying hot air into the drying mechanism; and the exhaust mechanism is connected with the drying mechanism and is used for recovering dichloromethane gas generated by volatilization of the thick edge part of the diaphragm dried by the drying mechanism to a waste gas treatment system. According to the drying system, secondary heating can be carried out on the thick edge part of the diaphragm, dichloromethane gas is brought out, and the unorganized discharged dichloromethane gas is pumped away and fed into a waste gas treatment system, so that the purposes that operation is safe in the space, the product physical property and appearance qualification rate is increased, and energy consumption is reduced are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery diaphragm production equipment, and in particular to a thick edge drying system for lithium battery diaphragms. Background Art

[0002] At present, the equipment and production process adjustment of oil film in the extraction section of the wet process of lithium battery diaphragm products are particularly important for the production of lithium battery diaphragm products. Each manufacturer has invested a lot of manpower and material resources in the research of this section.

[0003] However, at present, for the wet-process lithium battery diaphragm after extraction, when it enters the back-end process after drying, the thick edge of the diaphragm is not effectively stretched, the edge of the diaphragm is relatively thick, and the internal white oil is not completely extracted in the extraction system. The irritating dichloromethane liquid comes out of the drying equipment, resulting in a heavy odor of dichloromethane in the transition zone, affecting the operation of personnel in the space; and the thick edge of the diaphragm is easily shaken and curled due to the tension during transportation, resulting in appearance defects of the diaphragm in the back-end processing steps, resulting in defect degradation and film breakage risks in the finished film, increasing costs and reducing work efficiency.

[0004] Therefore, there is an urgent need to provide a system for drying the thick edges of lithium battery diaphragms to solve the above-mentioned technical problems. Utility Model Content

[0005] Based on this, a system for drying the thick edge of lithium battery diaphragms is provided to perform secondary heating on the thick edge of the diaphragm, bring out the dichloromethane gas and extract the unorganized emitted dichloromethane gas into the waste gas treatment system, thereby achieving the purpose of safe operation in this space, improving the qualified rate of product physical properties and appearance, and reducing energy consumption.

[0006] On the one hand, a system for drying the thick edge of a lithium battery diaphragm is provided, comprising: a drying mechanism, the drying mechanism being used for secondary drying of the thick edge of the diaphragm to dry the dichloromethane liquid entrained in the thick edge of the diaphragm; an air supply mechanism, the air supply mechanism being connected to the drying mechanism and being used to supply hot air into the drying mechanism; and an exhaust mechanism, the exhaust mechanism being connected to the drying mechanism and being used to recover the dichloromethane gas volatilized by the drying mechanism when the thick edge of the diaphragm is dried to a waste gas treatment system.

[0007] Optionally, the drying mechanism includes a drying box, and a plurality of air outlets are arranged on one side of the drying box; the diaphragm is located on the side of the drying box having the air outlets, and the thick edge of the diaphragm is located corresponding to the position of the air outlets; the air supply mechanism is connected to the drying box through an air inlet pipe, and is used to supply hot air into the drying box.

[0008] Optionally, the drying boxes are arranged in two upper and lower parts with relative spacing, and the air outlets of the two drying boxes are arranged opposite to each other; the thick edge of the diaphragm is located between the air outlets of the two drying boxes; and the air supply mechanism is connected to the two drying boxes respectively through two air inlet pipelines.

[0009] Optionally, the drying mechanism further comprises an air collecting hood, which is arranged on the sides of the two drying boxes and connected, and is used to collect dichloromethane gas generated by volatilization; the exhaust mechanism is connected to the air collecting hood via an exhaust pipeline.

[0010] Optionally, the air supply mechanism includes an air supply fan and a heater; the air supply fan is arranged at the front end of the heater, and the output end is connected to the heater; the output end of the heater is connected to the air intake pipeline.

[0011] Optionally, the heater is an electric heater.

[0012] Optionally, the air supply mechanism further includes a filter; the filter is arranged at the front end of the air supply fan and is used for filtering the fresh air entering from the front end.

[0013] Optionally, the exhaust mechanism includes an exhaust fan; the input end of the exhaust fan is connected to the exhaust pipeline; and the output end of the exhaust fan is connected to the exhaust gas treatment system.

[0014] Beneficial effects:

[0015] The above-mentioned system for drying the thick edge of lithium battery diaphragm can perform secondary heating on the thick edge of the diaphragm by utilizing the coordinated cooperation of the drying mechanism, the air supply mechanism and the exhaust mechanism to allow the dichloromethane on the membrane surface to volatilize and carry away the gas and discharge it, thereby reducing the risk of membrane surface defects and film breakage in subsequent processes, further improving the qualified indicators of the appearance and physical properties of the diaphragm, and avoiding the adjustment of the edge clamping amount or the change of process temperature during the production process of the film affecting the performance of the diaphragm, resulting in degradation of the diaphragm product, low product qualification rate, increased cost, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a system for drying the thick edge of a lithium battery separator in one embodiment.

[0017] Figure numerals: 1. drying mechanism; 11. drying box; 111. air outlet; 12. air collecting hood; 2. diaphragm; 3. air supply mechanism; 31. air supply fan; 32. heater; 33. filter; 4. exhaust mechanism; 41. exhaust fan; 5. air inlet pipeline; 6. exhaust pipeline; 7. main pipeline. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and therefore the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0020] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0021] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] The present application provides a system for drying the thick edge of a lithium battery diaphragm. The following is a detailed description of the system. Please refer to Figure 1 As shown, it includes; a drying mechanism 1, an air supply mechanism 3 and an exhaust mechanism 4. The air supply mechanism 3 and the exhaust mechanism 4 are respectively connected to the drying mechanism 1. The air supply mechanism 3 can supply hot air into the drying mechanism 1 by connecting to the drying mechanism 1. The drying mechanism 1 can perform secondary drying on the thick edge of the diaphragm 2 with the help of the hot air, and then dry the dichloromethane liquid entrained in the thick edge of the diaphragm 2. The exhaust mechanism 4 can recover the dichloromethane gas volatilized by the drying of the thick edge of the diaphragm 2 by the drying mechanism 1 to the waste gas treatment system by connecting to the drying mechanism 1.

[0023] In this embodiment, through the coordinated cooperation of the drying mechanism 1, the air supply mechanism 3 and the exhaust mechanism 4, the thick edge of the diaphragm 2 can be heated twice, and the dichloromethane liquid on the thick edge of the diaphragm 2 can be dried. After the dichloromethane liquid evaporates, it is discharged into the waste gas recovery system through the exhaust mechanism 4, thereby avoiding the emission of unorganized gas, and the dichloromethane gas can be recovered and recycled; in addition, by treating the thick edge of the heated diaphragm 2, the strength of the diaphragm can be improved, the internal stress of the diaphragm can be eliminated, and the risk of film breakage in the subsequent process can be avoided, and the appearance and physical properties of the diaphragm can be further improved. The qualified indicators, avoid the adjustment of the clamping amount or the change of process temperature during the production process of the diaphragm to affect the performance of the diaphragm, resulting in degradation of the diaphragm product, resulting in low product qualification rate, increased cost and other issues.

[0024] Please continue to refer to Figure 1 As shown, in this embodiment, it should be noted that the drying mechanism 1 includes a drying box 11, and the air supply mechanism 3 is connected to the drying box 11 through an air inlet pipe 5, and is used to supply hot air into the drying box 11. A plurality of air outlets 111 are provided on one side of the drying box 11, and the air outlets 111 are evenly distributed on one side of the drying box 11, and then the thick edge of the diaphragm 2 to be dried can be placed on the side of the drying box 11 with the air outlets 111, thereby, the air supply mechanism 3 supplies hot air into the drying box 11 through the air inlet pipe 5, and then flows out through the air outlets 111, and the hot air flowing out can perform secondary drying on the thick edge of the diaphragm 2.

[0025] Preferably, in this embodiment, two drying boxes 11 are provided, and the two drying boxes 11 are arranged at a relative interval up and down, and the air outlet holes 111 of the two drying boxes 11 are arranged oppositely, and the thick edge of the diaphragm 2 is located between the two drying boxes 11 during drying. Therefore, by arranging the upper and lower drying boxes 11 oppositely, the front and back sides of the thick edge with dichloromethane can be heated at the same time, thereby accelerating the drying efficiency.

[0026] It should also be noted that the air supply mechanism 3 is connected to the two drying boxes 11 through two air intake pipes 5. It can be understood that the hot air of the air supply mechanism 3 enters the two drying boxes 11 through the two air intake pipes 5. The air supply mechanism 3 includes an air supply fan 31, a heater 32 and a filter 33. The filter 33, the air supply fan 31 and the heater 32 are arranged in sequence. In other words, the filter 33 is arranged at the front end of the air supply fan 31, and the heater 32 is arranged at the rear end of the air supply fan 31. In this way, the fresh air inhaled by the air supply fan 31 will first be filtered through the filter 33, and the clean fresh air after filtration will be heated by the heater 32, so as to avoid the introduction of impurities when the thick edge of the diaphragm 2 is subsequently dried. Preferably, the heater 32 adopts an electric heater, which is convenient for heating.

[0027] During installation, the input end of the air supply fan 31 is connected to the filter 33, the output end of the air supply fan 31 is connected to the heater 32, the output end of the heater 32 is connected to the main line 7, and the main line 7 is connected to two air intake pipes 5 in parallel, that is, the direction of the hot air is divided into two.

[0028] In some embodiments, the drying mechanism 1 also includes a gas collecting hood 12, which is arranged on the sides of the two drying boxes 11 and connected. The gas collecting hood 12 is used to collect dichloromethane gas generated by volatilization. The setting of the gas collecting hood 12 can collect the dichloromethane gas generated by the two drying boxes 11 in the process of secondary drying of the thick edge of the diaphragm 2, thereby avoiding unorganized emission of dichloromethane gas.

[0029] In one example, the exhaust mechanism 4 is connected to the gas collecting hood 12 through the exhaust pipeline 6, and the exhaust mechanism 4 includes an exhaust fan 41, the input end of the exhaust fan 41 is connected to the exhaust pipeline 6, and the output end of the exhaust fan 41 is connected to the exhaust gas treatment system. Thus, the exhaust fan 41 discharges the dichloromethane gas collected by the gas collecting hood 12 to the exhaust gas treatment system through the exhaust pipeline 6 for treatment.

[0030] The implementation principle of this embodiment is as follows: during the production process, the drying system is turned on, and the air supply fan 31 filters the fresh air in the environment through the filter 33 and then enters the heater 32, and the fresh air is heated to the process required temperature and sent to the drying mechanism 1, and the hot air is blown to the thick edge of the diaphragm 2 through the air outlet 111 of the two drying boxes 11, and the front and back sides of the thick edge with dichloromethane are heated, and then the dichloromethane liquid is volatilized into gas, and the exhaust fan 41 extracts the dichloromethane gas and transports it to the waste gas treatment system. Therefore, the thick edge drying system for lithium battery diaphragms in this embodiment can realize the fast, safe and effective processing of the thick edge of the diaphragm 2 in terms of operation, improve the appearance defects of the diaphragm in terms of products, and improve the qualified rate of the diaphragm.

[0031] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A system for drying the thick edge of lithium battery diaphragm, characterized in that: include; A drying mechanism (1), the drying mechanism (1) is used for secondary drying of the thick edge of the diaphragm (2) to dry the dichloromethane liquid entrained in the thick edge of the diaphragm (2); An air supply mechanism (3), the air supply mechanism (3) being connected to the drying mechanism (1) and being used for supplying hot air into the drying mechanism (1); An exhaust mechanism (4) is connected to the drying mechanism (1) and is used to recover the dichloromethane gas volatilized by the drying mechanism (1) when the thick edge of the diaphragm (2) is dried to a waste gas treatment system.

2. The system for drying thick edges of lithium battery diaphragms according to claim 1, characterized in that: The drying mechanism (1) comprises a drying box (11), and a plurality of air outlet holes (111) are arranged on one side of the drying box (11); The diaphragm (2) is located on a side of the drying box (11) having an air outlet (111), and a thick edge portion of the diaphragm (2) is located corresponding to the position of the air outlet (111); The air supply mechanism (3) is connected to the drying box (11) via an air intake pipeline (5) and is used to supply hot air into the drying box (11).

3. The system for drying thick edges of lithium battery diaphragms according to claim 2, characterized in that: The drying boxes (11) are arranged in two parts, one above the other and arranged at a relative interval, and the air outlet holes (111) of the two drying boxes (11) are arranged opposite to each other; The thick edge of the diaphragm (2) is located between the air outlet holes (111) of the two drying boxes (11); The air supply mechanism (3) is respectively connected to the two drying boxes (11) via two air inlet pipelines (5).

4. The system for drying thick edges of lithium battery diaphragms according to claim 3, characterized in that: The drying mechanism (1) further comprises a gas collecting hood (12), wherein the gas collecting hood (12) is arranged on the sides of the two drying boxes (11) and connected to each other, and the gas collecting hood (12) is used to collect dichloromethane gas generated by volatilization; The exhaust mechanism (4) is connected to the air collecting hood (12) via an exhaust pipeline (6).

5. The system for drying thick edges of lithium battery diaphragms according to claim 3 or 4, characterized in that: The air supply mechanism (3) comprises an air supply fan (31) and a heater (32); The air supply fan (31) is arranged at the front end of the heater (32), and the output end is connected to the heater (32); The output end of the heater (32) is connected to the air intake pipeline (5).

6. The system for drying thick edges of lithium battery diaphragms according to claim 5, characterized in that: The heater (32) is an electric heater.

7. The system for drying thick edges of lithium battery diaphragms according to claim 5, characterized in that: The air supply mechanism (3) further includes a filter (33); The filter (33) is arranged at the front end of the air supply fan (31) and is used to filter the fresh air entering from the front end.

8. The system for drying thick edges of lithium battery diaphragms according to claim 4, characterized in that: The exhaust mechanism (4) comprises an exhaust fan (41); The input end of the exhaust fan (41) is connected to the exhaust pipeline (6); The output end of the exhaust fan (41) is connected to the exhaust gas treatment system.

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