Lithium battery diaphragm vacuum cover device

Abstract

The utility model relates to the technical field of lithium battery diaphragm tape casting, in particular to a lithium battery diaphragm vacuum cover device, which comprises a vacuum cover group, an oil accumulation chamber is arranged at the bottom of the vacuum cover group, the oil accumulation chamber comprises a perforated plate group, and the perforated plate group comprises a first perforated plate and a second perforated plate. When the vacuum cover device is used, the porous plate group is arranged in the oil accumulation chamber, the vacuum cover group, the oil accumulation chamber and a film forming operation space are spatially divided by the porous plate group, and the pressure in the vacuum cover device is more stable and has smaller fluctuation through porous connection of the porous plate group, so that the molding stability of a cast film attached piece is effectively improved; the oil accumulation chamber is arranged at the bottom of the vacuum cover group, and oil smoke condensed into oil drops in the oil accumulation chamber is collected by utilizing the oil accumulation chamber, so that the technical defects of a traditional vacuum cover are effectively overcome, the appearance defects of oil stains on the surface of a membrane material are avoided, and the quality of a lithium battery membrane product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragm tape casting, in particular to a lithium battery diaphragm vacuum cover device. Background Art

[0002] The lithium battery separator is a specially formed polymer film with a microporous structure. In a lithium battery, this microporous film effectively isolates the positive and negative electrodes of the lithium battery and allows lithium ions to pass freely, undergoing redox reactions with electrons, thereby achieving free charging and discharging of the lithium battery.

[0003] During the processing and manufacturing process of lithium battery diaphragms, the raw materials are first mixed and plasticized into a molten fluid through an extrusion system, and then formed into a cast melt through a die head. The melt adheres to the surface of the casting roller and cools to become a film material. However, the traditional vacuum hood attachment device cannot effectively remove the condensed oil smoke inside. The condensed oil droplets fall onto the surface of the molding equipment (casting roller), forming appearance defects. This appearance defect will affect the charging and discharging efficiency of the lithium battery diaphragm. At the same time, when the exhaust fan is used to directly suck the oil smoke in the vacuum hood attachment device, it is also easy to cause the air pressure in the vacuum hood to be unstable, affecting the vacuum degree in the vacuum hood.

[0004] In view of this, we propose a lithium battery diaphragm vacuum cover device. Utility Model Content

[0005] The purpose of the present invention is to provide a lithium battery diaphragm vacuum cover attachment device with an oil accumulation chamber and capable of providing a more stable vacuum degree, so as to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A lithium battery diaphragm vacuum cover device includes a vacuum cover group installed between a die head device and a molding device, wherein the die head device and the molding device constitute a film forming working space, an oil accumulation chamber is provided at the bottom of the vacuum cover group, and the oil accumulation chamber includes a porous plate group, and the porous plate group includes a first porous plate and a second porous plate, wherein the first porous plate is arranged between the oil accumulation chamber and the vacuum cover group, and the second porous plate is arranged between the working space and the oil accumulation chamber.

[0008] As a further solution of the present invention: the vacuum cover group includes a vacuum cover box, the top of the vacuum cover box is provided with an exhaust port connected to the vacuum cover box, and the exhaust port is connected to an external exhaust fan.

[0009] As a further solution of the present invention: the first porous plate is a full-hole plate, and the second porous plate is divided into two parts, the upper part of the second porous plate is provided with through holes, and the lower part of the second porous plate is a non-porous plate.

[0010] As a further solution of the present invention: a back plate is fixed on the side of the vacuum cover box away from the exhaust port, and the oil accumulation chamber is enclosed by a first porous plate, a second porous plate and a back plate, wherein the lower part of the second porous plate is connected to the back plate, and a rubber strip is provided at the connection between the lower part of the second porous plate and the back plate.

[0011] As a further solution of the present invention: detachable side panels are provided on both sides of the oil accumulation chamber, and fixing holes for fixing the side panels are provided on the side panels.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the lithium battery diaphragm vacuum cover device, a porous plate group is arranged in the oil accumulation chamber, and the porous plate group is used to divide the space between the vacuum cover group, the oil accumulation chamber and the working space. In addition, the porous connection of the porous plate group makes the pressure in the vacuum cover device more stable and has less fluctuation, which effectively improves the stability of the cast film attached sheet molding.

[0014] 2. In the lithium battery diaphragm vacuum cover device, an oil accumulation chamber is set at the bottom of the vacuum cover group. The oil accumulation chamber is used to collect the oil smoke condensed into oil droplets in the oil accumulation chamber, which effectively solves the technical disadvantages of traditional vacuum covers, avoids the appearance defects of oil stains on the surface of the membrane material, and improves the quality of lithium battery diaphragm products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0016] Figure 2 This is the overall cross-section of this scheme;

[0017] Figure 3 This is a schematic diagram of the side panel of this scheme.

[0018] The meaning of each number in the figure is:

[0019] 100, vacuum cover assembly; 101, exhaust port; 102, vacuum cover box; 103, back plate;

[0020] 200, oil accumulation chamber; 201, first porous plate; 202, second porous plate; 203, rubber strip;

[0021] 300, side panel; 301, fixing hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, this embodiment provides a lithium battery diaphragm vacuum cover device, including a vacuum cover group 100 installed between a die head device and a molding device, wherein the die head device and the molding device constitute a film forming operation space. Considering that during the processing and manufacturing of traditional lithium battery diaphragms, oil droplets condensed from oil smoke will drip onto the surface of the molding device, an oil accumulation chamber 200 is provided at the bottom of the vacuum cover group 100. The oil droplets sucked out by the vacuum are condensed into oil droplets and collected at the bottom of the oil accumulation chamber 200. Considering that the air pressure fluctuation will affect the suction, the vacuum diaphragm is not easy to be damaged. In order to affect the forming stability of the cast film attachment, the oil accumulation chamber 200 includes a porous plate group, and the porous plate group includes a first porous plate 201 and a second porous plate 202, wherein the first porous plate 201 is arranged between the oil accumulation chamber 200 and the vacuum cover group 100, and the second porous plate 202 is arranged between the working space and the oil accumulation chamber 200. The first porous plate 201 and the second porous plate 202 are used to divide the space, and the porous connection of the porous plate group makes the air pressure more stable and less volatile, thereby effectively improving the forming stability of the cast film attachment.

[0024] The improvement of this embodiment lies in that an oil accumulation chamber 200 is provided at the bottom of the vacuum hood group 100, and the oil accumulation chamber 200 is used to collect the oil smoke condensed into oil droplets in the oil accumulation chamber 200, thereby effectively solving the technical disadvantages of the traditional vacuum hood, avoiding the appearance defects of oil stains on the surface of the membrane material, and improving the quality of lithium battery diaphragm products. A porous plate group is provided in the oil accumulation chamber 200, and the porous plate group is used to divide the space between the vacuum hood group 100, the oil accumulation chamber 200 and the working space. At the same time, through the porous connection of the porous plate group, the pressure in the vacuum hood device is more stable and fluctuates less, which effectively improves the stability of the cast film attachment forming.

[0025] like Figure 2As shown, due to the high temperature generated by the die head equipment during operation, some components of the liquid paraffin in the melt are vaporized to produce oil smoke. Therefore, the vacuum cover group 100 includes a vacuum cover box 102. The top of the vacuum cover box 102 is provided with an exhaust port 101 connected to the vacuum cover box 102. The exhaust port 101 is connected to an external exhaust fan. The first porous plate 201 is a full-hole plate, and the second porous plate 202 is divided into two parts, the upper part of the second porous plate 202 is provided with a through hole, which is connected to the exhaust port 101 through the exhaust fan to suck the oil smoke in the working space and discharge it through the through holes of the first porous plate 201 and the second porous plate 202. The temperature in the oil accumulation chamber 200 decreases with the exhaust operation of the exhaust fan. Therefore, part of the oil smoke will condense into oil droplets and slide into the oil accumulation chamber 200 under the action of gravity.

[0026] In order to avoid oil leakage at the bottom of the oil accumulation chamber 200, the vacuum cover box 102 includes a back plate 103. The oil accumulation chamber 200 is enclosed by a first porous plate 201, a second porous plate 202 and the back plate 103. The lower part of the second porous plate 202 is connected to the back plate 103. The lower part of the second porous plate 202 is a non-porous plate. A rubber strip 203 is used at the connection between the second porous plate 202 and the back plate 103. The rubber strip 203 is used to seal the connection between the second porous plate 202 and the back plate 103. At the same time, a replaceable wool felt is placed at the bottom of the inner cavity of the oil accumulation chamber 200. The oil absorption of the wool felt and the sealing of the rubber strip 203 are used to reduce oil leakage at the bottom of the oil accumulation chamber 200.

[0027] like Figure 3 As shown, considering the removal of accumulated oil in the oil accumulation chamber 200 and the sealing and fixing of both sides of the oil accumulation chamber 200, detachable side panels 300 are provided on both sides of the oil accumulation chamber 200. By regularly removing the side panels 300, the accumulated oil in the inner cavity of the oil accumulation chamber 200 can be cleaned. The side panels 300 are provided with fixing holes 301 for fixing the side panels 300. Bolts are passed through the fixing holes 301 to fix the two side panels 300 on both sides of the oil accumulation chamber 200 respectively, so as to seal both sides of the oil accumulation chamber 200.

[0028] It needs to be further explained that the melt formed in the processing and manufacturing process of lithium battery separators is mainly composed of PE polyethylene and liquid paraffin. When the temperature rises, PE melts and is similarly soluble in liquid paraffin, and the mixture becomes a uniform melt. However, liquid paraffin itself is a mixture, and the boiling point of some components inside the liquid paraffin is lower than the boiling point of the melt flowing out of the die head. Therefore, some components inside the liquid paraffin will vaporize and turn into oil smoke; the molding equipment mainly refers to the casting roller, and cooling water passes through the casting roller. When the melt is adsorbed and adhered to the casting roller, the melt undergoes heat exchange, and PE will crystallize and become solid.

[0029] In summary, the working principle of this solution is as follows:

[0030] After the two side plates 300 are fixed to the two sides of the oil accumulation chamber 200 respectively by means of bolts through the fixing holes 301, the entire device is mounted on the mounting plate between the die head device and the molding device by means of bolts. During the installation, the second porous plate 202 faces the die head device and the gap between the second porous plate 202 and the die head device is sealed with aluminum foil. After that, the ventilation pipe of the external exhaust fan is connected to the exhaust port 101 on the vacuum cover box 102. The installation of the entire device is completed. During the casting operation, the exhaust fan is started and the suction force generated will cast the die head film. The melt coming out is adsorbed and adhered to the molding equipment. At the same time, most of the smoke oil generated during production is discharged through the first porous plate 201 and the second porous plate 202. A small part of the smoke oil is condensed into oil droplets in the oil accumulation chamber 200, and slides to the bottom of the oil accumulation chamber 200 due to gravity and is absorbed by the wool felt. When it is necessary to clean the accumulated oil in the oil accumulation chamber 200, remove the bolts, take down the side panel 300 on one side of the oil accumulation chamber 200, draw out the wool felt in the oil accumulation chamber 200 and replace it with a new one, and then fix the side panel 300 with the bolts again.

[0031] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0032] 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 modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. A lithium battery diaphragm vacuum cover device, comprising a vacuum cover group (100) installed between a die head device and a molding device, wherein the die head device and the molding device constitute a film forming operation space, characterized in that: An oil accumulation chamber (200) is provided at the bottom of the vacuum cover assembly (100), and the oil accumulation chamber (200) includes a porous plate assembly, and the porous plate assembly includes a first porous plate (201) and a second porous plate (202), wherein the first porous plate (201) is arranged between the oil accumulation chamber (200) and the vacuum cover assembly (100), and the second porous plate (202) is arranged between the working space and the oil accumulation chamber (200).

2. The lithium battery diaphragm vacuum cover device according to claim 1, characterized in that: The vacuum cover set (100) comprises a vacuum cover box (102), the top of the vacuum cover box (102) is provided with an exhaust port (101) connected to the vacuum cover box (102), and the exhaust port (101) is connected to an external exhaust fan.

3. The lithium battery diaphragm vacuum cover device according to claim 2, characterized in that: The first porous plate (201) is a full-hole plate, and the second porous plate (202) is divided into two parts, an upper part and an lower part, wherein the upper part of the second porous plate (202) is provided with through holes, and the lower part of the second porous plate (202) is a non-porous plate.

4. The lithium battery diaphragm vacuum cover device according to claim 3, characterized in that: A back plate (103) is fixed to the side of the vacuum cover box (102) away from the exhaust port (101), and the oil accumulation chamber (200) is enclosed by a first porous plate (201), a second porous plate (202) and the back plate (103), wherein the lower part of the second porous plate (202) is connected to the back plate (103), and a rubber strip (203) is provided at the connection between the lower part of the second porous plate (202) and the back plate (103).

5. The lithium battery diaphragm vacuum cover device according to claim 4, characterized in that: Removable side panels (300) are provided on both sides of the oil accumulation chamber (200), and fixing holes (301) for fixing the side panels (300) are provided on the side panels (300).

Images