CN214766586U

CN214766586U - Coating die head

Info

Publication number: CN214766586U
Application number: CN202120639927.5U
Authority: CN
Inventors: 马毅; 丁亚男; 苏夏; 杨树涛
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-11-19
Anticipated expiration: 2031-03-29

Abstract

The utility model provides a coating die head, which comprises a die head body with a coating opening, and a purging mechanism and a negative pressure adsorption mechanism which are arranged on the die head body and are respectively arranged at two sides of the coating opening, wherein the purging mechanism comprises a purging unit and an air inlet unit, and the negative pressure adsorption mechanism comprises an adsorption unit and an air exhaust unit; the blowing unit and the adsorption unit are respectively arranged on the die head body, the blowing unit is provided with a plurality of blowing runners which are sequentially arranged along the length direction of the coating port, and the adsorption unit is provided with a plurality of adsorption runners which are sequentially arranged along the length direction of the coating port. Coating die head, can constitute simultaneously and handle and negative pressure adsorption to sweeping of coating mouth, and then avoid taking place the thick liquids and pile up and lead to the coating unusual, and install the practicality strong, the operating efficiency is high, be worth using widely.

Description

Coating die head

Technical Field

The utility model relates to a coating machine accessory technical field, in particular to coating die head.

Background

Coating is an important process in lithium battery production, and in popular terms, active substances are uniformly coated on a current collector (copper foil/aluminum foil) according to a certain weight, and the coated pole piece is used in the next process. At present, with the continuous development of the battery industry, the quality requirements of various batteries are higher and higher, and in order to improve the power density of the batteries, the coating amount of a battery pole piece is often required to be reduced, and the coating thickness is reduced, namely the process of coating an ultrathin coating is realized.

However, reducing the coating thickness can cause many product anomalies during the coating process, such as: the coating surface density is unstable, the coating appearance is scratched, the coating is exposed to foil and the like, and the abnormal conditions can cause the capacity abnormality of the finished battery, and in severe cases, the lithium precipitation phenomenon can also occur, so that the separator is pierced to cause the internal short circuit of the battery, and further the safety accident is caused, therefore, the improvement of the coating quality of the ultrathin coating is very important.

In the prior art, most enterprises generally improve the coating quality of the coating of the ultrathin coating by adopting a thinner coating gasket or reducing the distance between a coating die head and a coating back roll, but the effect is not ideal, the problems of inconsistent coating surface density, poor appearance and other coating quality cannot be well solved, and in the process of coating the ultrathin coating, the slurry accumulation condition is very easy to occur due to the small gap between a coating opening and the back roll, so that the coating quality is influenced.

Although can be through the mode that is located coating mouth one side at the coating die head and add the vacuum negative pressure structure and realize vacuum coating, and then improve the coating quality to a certain extent, vacuum coating's main effect lies in making coating mouth department whole be in the vacuum state, so still there is not enough in the aspect of solving thick liquids and piling up, and under the negative pressure state, during the thick liquids of coating got into the vacuum negative pressure structure easily, cause the influence to equipment, reduced the production efficiency of ultra-thin coating, increased manufacturing cost.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a coating die head to can sweep simultaneously and handle and negative pressure adsorption to coating mouth department, avoid taking place the thick liquids and pile up, and then effectively improve the coating quality.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a coating die head comprises a die head body with a coating opening, and a purging mechanism and a negative pressure adsorption mechanism which are arranged on the die head body and are respectively arranged on two sides of the coating opening, wherein:

the blowing mechanism comprises a blowing unit and an air inlet unit, the blowing unit is arranged on the die head body and is provided with a plurality of blowing channels which are sequentially arranged along the length direction of the coating port, one end of each blowing channel is provided with an air inlet, and the other end of each blowing channel is provided with a slit-shaped blowing port which is arranged towards the coating port; the air inlet unit is arranged on the purging unit and is provided with an air inlet pipe connected with an external air source and air inlet branch pipes respectively connected with the air inlet pipe and the air inlets;

the negative pressure adsorption mechanism comprises an adsorption unit and an air extraction unit, the adsorption unit is arranged on the die head body and is provided with a plurality of adsorption flow channels which are sequentially arranged along the length direction of the coating port, one end of each adsorption flow channel is provided with an air outlet, and the other end of each adsorption flow channel is provided with a slit-shaped adsorption port which is arranged towards the coating port; the air extraction unit is arranged on the adsorption unit and is provided with an air extraction pipe connected with an external negative pressure source and air extraction branch pipes respectively connected with the air extraction pipe and the air outlets.

Furthermore, an air inlet control valve is respectively connected in series with each air inlet branch pipe, an air exhaust control valve is respectively connected in series with each air exhaust branch pipe,

the purging mechanism further comprises a pressure detection unit arranged on the purging unit, and the pressure detection unit is provided with a pressure sensor respectively arranged at each purging flow channel;

the negative pressure adsorption mechanism further comprises a negative pressure detection unit arranged on the adsorption unit, and the negative pressure detection unit is provided with negative pressure sensors respectively arranged at the adsorption flow channels.

Furthermore, the purging unit comprises a purging shell fixedly connected to the die head body, a positive pressure cavity extending along the length direction of the coating port is formed in the purging shell, a plurality of first partition plates arranged at intervals along the length direction of the coating port are arranged in the positive pressure cavity, and each purging flow channel is formed by the separation of the first partition plates;

the adsorption unit comprises an adsorption shell fixedly connected to the die head body, a negative pressure cavity extending along the length direction of the coating port is constructed in the adsorption shell, a plurality of second partition plates are arranged in the negative pressure cavity at intervals along the length direction of the coating port, and the second partition plates are separated to form adsorption flow channels.

Further, the positive pressure cavity is arranged at one side of the purging shell in an open manner, one side of the purging shell at the open manner is buckled on the die head body, the purging port is formed between the purging shell and the die head body, and a first sealing structure arranged around the positive pressure cavity is arranged between the purging shell and the die head body outside the position of the purging port;

the negative pressure cavity is arranged on one side of the adsorption shell in an open mode, one side of the adsorption shell, which is open, is buckled on the die head body, the adsorption port is formed between the adsorption shell and the die head body, and a second sealing structure which is arranged around the negative pressure cavity is arranged between the adsorption shell and the die head body and outside the position of the adsorption port.

Further, the first sealing structure comprises a first sealing strip clamped between the blowing shell and the die head body, and the second sealing structure comprises a second sealing strip clamped between the adsorption shell and the die head body.

Further, the first sealing strip and the second sealing strip are made of fluororubber.

Further, a first bulge protruding towards one side of the die head body is formed on the purging shell outside the purging port, the first bulge is arranged around the positive pressure cavity, and the first sealing strip is arranged in a manner of being attached to the first bulge;

the suction shell is provided with a suction opening, the suction opening is arranged at the position outside the suction opening, a second bulge protruding from one side of the die head body is formed on the suction shell, the second bulge winds the negative pressure cavity and is arranged, and the second sealing strip is attached to the second bulge.

Further, the height of the first protrusion and the height of the second protrusion are both between 1 mm and 3 mm.

Further, the die head body is provided with an upper die head and a lower die head which are connected in a buckling manner, the coating opening is formed between the upper die head and the lower die head, the purging mechanism is positioned on one of the upper die head and the lower die head, and the negative pressure adsorption mechanism is positioned on the other of the upper die head and the lower die head.

Further, a coating gasket is arranged between the upper die head and the lower die head, a discharge hole is formed in the coating gasket, a vertex angle of the coating gasket, which is located at the discharge hole, is chamfered, and the length ratio of two right-angle sides of the chamfer is D1: d2 is between 1.0 and 1.2.

Compared with the prior art, the utility model discloses following advantage has:

(1) coating die head, set up through the cooperation and sweep unit and air inlet unit to can sweep the processing to coating mouth department, simultaneously, set up through the cooperation of adsorbing the unit and the unit of bleeding, to can carry out the negative pressure to coating mouth department and adsorb the processing, and then sweep processing and negative pressure adsorption simultaneously and handle coating mouth department, pile up and lead to the coating unusual in order to avoid taking place the thick liquids, thereby effectively improve the coating quality.

The blowing channels are arranged on the blowing unit in sequence along the length direction of the coating port, and the blowing ports of the blowing channels, which are arranged towards the coating port, are arranged in a slit shape, so that the blowing effect is improved; a plurality of adsorption flow channels are sequentially arranged in the adsorption unit along the length direction of the coating port, and each adsorption flow channel is arranged in a slit shape towards the adsorption port arranged on the coating port, so that the adsorption effect is favorably improved.

(2) The air inlet control valves are respectively connected to the air inlet branch pipes in series, so that the air pressure in each sweeping flow passage can be conveniently adjusted, and the relatively optimal use effect can be obtained. The pressure detection unit is provided with pressure sensors respectively arranged at the purging runners, so that the detection of the air pressure in the purging runners is facilitated, and the adjustment of the air pressure in the purging runners through the air inlet control valves is facilitated.

In a similar way, the air exhaust control valves are respectively connected in series on each air exhaust branch pipe, so that the air pressure in each adsorption flow channel can be conveniently adjusted; the negative pressure detection unit is provided with negative pressure sensors respectively arranged at the adsorption flow channels, so that the detection of the air pressure in each adsorption flow channel is facilitated, and the adjustment of the air pressure in each purging flow channel through each air pumping control valve is facilitated.

(3) And a first sealing structure arranged around the positive pressure cavity is arranged between the blowing shell and the die head body outside the blowing port, so that sealing treatment on a partial area between the blowing shell and the die head body can be formed, and blowing treatment on the coating port by the blowing unit is facilitated. Similarly, a second sealing structure arranged around the negative pressure cavity is arranged between the adsorption shell outside the position of the adsorption port and the die head body, so that sealing treatment on a part of area between the adsorption shell and the die head body can be formed, and adsorption treatment on the coating port by the adsorption unit is facilitated.

(4) All use the sealing strip in first seal structure and the second seal structure, simple structure easily realizes, and the sealing strip low price, is convenient for maintain and change.

(5) The first sealing strip and the second sealing strip are both made of fluororubber, and the fluororubber has the characteristics of excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance, atmospheric aging resistance and the like, so that the use effects of the first sealing strip and the second sealing strip can be improved.

(6) Forming a first bulge protruding towards one side of the die head body on the blowing shell outside the blowing port, wherein the first bulge is arranged around the positive pressure cavity, the first sealing strip is arranged in a manner of being attached to the first bulge, and the height of the first bulge is set to be 1-3mm, so that the relatively optimal sealing effect can be obtained on the premise of not influencing the blowing effect; in a similar way, the second protrusion is arranged on the adsorption shell, the height of the second protrusion is set between 1-3mm, and the second sealing strip is configured, so that the relatively optimal sealing effect can be obtained on the premise of not influencing the adsorption effect, and the using effect of the whole device is further improved.

(7) The apex angle chamfer that is located discharge gate department of coating gasket sets up, and the length ratio D1 on two right-angle sides of chamfer: d2 is between 1.0-1.2 to avoid the coating width of the coating opening from being too large due to the blowing treatment, thereby avoiding the reduction of the coating quality.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural view of a coating die according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a purge unit according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a coated gasket according to an embodiment of the present invention;

FIG. 4 is a partial enlarged view of portion B of FIG. 3;

description of reference numerals:

1. a die head body; 2. an upper die head; 3. a lower die head;

4. purging the shell; 400. purging the flow channel; 401. an air inlet; 402. a first separator;

5. an air intake unit; 500. an air inlet pipe; 501. an intake branch pipe;

6. an adsorption housing; 7. an air extraction unit; 700. an air exhaust pipe; 701. an air exhaust branch pipe;

8. coating a gasket; 800. chamfering; 9. an areal density adjusting mechanism; d1, chamfering the length of the right-angle side in the length direction of the coating gasket; d2, chamfering the length of the right-angle side in the width direction of the coating gasket.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a coating die head, and on the whole structure, the coating die head comprises a die head body 1 with a coating opening, and a purging mechanism and a negative pressure adsorption mechanism which are arranged on the die head body 1 and are respectively arranged on two sides of the coating opening, wherein the purging mechanism comprises a purging unit and an air inlet unit 5 so as to form purging treatment on the coating opening, and the negative pressure adsorption mechanism comprises an adsorption unit and an air exhaust unit 7 so as to form negative pressure adsorption treatment on the coating opening, so that the coating quality is improved.

It should be noted that, the die head body 1 in this embodiment is further provided with an areal density adjusting mechanism 9 with a micrometer in a conventional coating die head product, so as to perform preliminary adjustment on the coating areal density; in addition, the structures of the coating die not described in this embodiment can refer to the common structural parts in the prior art, and are not described herein again.

Based on the above design concept, an exemplary structure of the coating die head of the present embodiment is as shown in fig. 1 to 4, the purging mechanism in the present embodiment includes a purging unit and an air inlet unit 5, the purging unit is disposed on the die head body 1, the purging unit has a plurality of purging flow channels 400 sequentially arranged along the length direction of the coating opening, and one end of each purging flow channel 400 is provided with an air inlet 401, and the other end is provided with a slit-shaped purging opening arranged toward the coating opening; the air intake unit 5 is disposed on the purge unit, and the air intake unit 5 has an air intake pipe 500 connected to an external air source, and air intake branch pipes 501 respectively connecting the air intake pipe 500 and each air intake port 401.

Of course, the number of the purge flow channels 400 mentioned in the present embodiment is generally set according to the required coating width, and the distance between the purge flow channels 400 is preferably set to about 50mm, so as to achieve the relatively optimal use effect. The gas in the external gas source in the embodiment can preferably adopt dry gas or nitrogen, and the power supply device of the external gas source can adopt a conventional air pump device product.

In a preferred embodiment, in the present embodiment, an air intake control valve is connected in series to each air intake branch pipe 501, so that the air pressure in each purge flow passage 400 can be easily adjusted, which is advantageous for obtaining a relatively optimal use effect. Meanwhile, the purging mechanism further comprises a pressure detection unit arranged on the purging unit, and the pressure detection unit is provided with pressure sensors respectively arranged at the purging runners 400, so that detection of air pressure in the purging runners 400 is facilitated, and adjustment of the air pressure in the purging runners 400 through the air inlet control valves is facilitated.

It is to be noted that the above-described intake air control valve and pressure sensor are not explicitly shown in the drawings, and both are preferably employed with conventional products in the prior art; it can be understood that the coating die head in this embodiment is further connected to an external control system and a circuit to implement cooperation and automatic control between the pressure detection unit, the air inlet control valve and other components in the coating die head, and the control system may refer to a common product in the prior art, and will not be described herein again.

Referring to fig. 1 and 2, in a specific structure, the purging unit includes a purging housing 4 fixedly connected to the die head body 1, a positive pressure cavity extending along the length direction of the coating opening is configured in the purging housing 4, a plurality of first partition plates 402 arranged at intervals along the length direction of the coating opening are disposed in the positive pressure cavity, and each purging flow channel 400 is formed by the partition of the first partition plates 402; preferably, the positive pressure cavity is arranged at one side of the purging shell 4 in an open manner, the open side of the purging shell 4 is buckled on the die head body 1, the purging port is formed between the purging shell 4 and the die head body 1, and a first sealing structure arranged around the positive pressure cavity is arranged between the purging shell 4 and the die head body 1 outside the position of the purging port, so that sealing treatment on a partial area between the purging shell 4 and the die head body 1 can be formed, and purging treatment on the coating port by the purging unit is facilitated.

It should be noted that the first sealing structure in the present embodiment is not explicitly shown in the drawings; in this embodiment, the material of the purging shell 4 may preferably be 304 stainless steel, which is simple in material selection and easy to implement, and the purging shell 4 may have the characteristics of good corrosion resistance, heat resistance, mechanical properties, and the like, so as to facilitate the improvement of the use effect of the purging shell 4, and the purging shell 4 may be internally polished to round the inner edge of the purging shell, so as to further improve the use effect of the purging shell 4.

For promoting the result of use of first seal structure, first seal structure in this embodiment is located the first sealing strip between casing 4 and the die head body 1 of sweeping including being pressed from both sides to make the whole simple easy realization of structure, and the sealing strip low price, be convenient for maintain and change. And as a further arrangement, the first sealing strip is made of fluororubber, and the fluororubber has the characteristics of excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance, atmospheric aging resistance and the like, so that the using effect of the first sealing strip can be improved.

In addition, as shown in fig. 2, in the specific structure, a first protrusion protruding toward one side of the die head body 1 is formed on the purging shell 4 except the position of the purging port, the first protrusion is arranged around the positive pressure cavity, and the first sealing strip is arranged depending on the first protrusion; and preferably, the height of the first bulge is 1-3mm, so that the relatively optimal sealing effect can be obtained on the premise of not influencing the sweeping and blowing effect, and the using effect of the whole device is further improved.

Of course, the first protrusion mentioned here is not explicitly shown in the drawings, but the dotted line a shown in fig. 2 is an illustration of the position of the first protrusion and the first sealing strip provided on the purge housing 4, and in practical applications, the position can be finely adjusted according to practical situations so as to achieve relatively optimal use effect.

In this embodiment, as shown in fig. 1, the negative pressure adsorption mechanism includes an adsorption unit and an air extraction unit 7, the adsorption unit is disposed on the die head body 1, and the adsorption unit has a plurality of adsorption flow channels sequentially arranged along the length direction of the coating opening, and one end of each adsorption flow channel is provided with an air outlet, and the other end is provided with a slit-shaped adsorption opening arranged toward the coating opening; the air extraction unit 7 is arranged on the adsorption unit, and the air extraction unit 7 is provided with an air extraction pipe 700 connected with an external negative pressure source and an air extraction branch pipe 701 respectively connected with the air extraction pipe 700 and each air outlet.

It should be noted that, as a preferred embodiment, the negative pressure adsorption mechanism in the present embodiment has substantially the same structural configuration as the above-described purge mechanism, wherein the specific structural arrangements of the adsorption unit and the suction unit 7 correspond to the structural parts of the purge unit and the intake unit 5, respectively; in addition, the specific structure of the negative pressure adsorption mechanism in this embodiment can refer to the schematic structure of the related structure of the purging structure in fig. 1 to 4, and details are not repeated here and below, so that the content of this embodiment is expressed simply and accurately. In addition, the power supply device of the external negative air source in the embodiment can adopt a conventional vacuum pump device product.

In the specific structure of the negative pressure adsorption mechanism, each air exhaust branch pipe 701 is respectively connected with an air exhaust control valve in series, so that the air pressure in each adsorption flow channel can be conveniently adjusted; and the negative pressure adsorption mechanism also comprises a negative pressure detection unit arranged on the adsorption unit, and the negative pressure detection unit is provided with a negative pressure sensor respectively arranged at each adsorption flow channel, so that the detection of the air pressure in each adsorption flow channel is favorably realized, and the adjustment of the air pressure in each purging flow channel 400 through each air exhaust control valve is favorably realized.

Of course, the evacuation control valve and the negative pressure sensor referred to herein are not explicitly shown in the drawings, and both are preferably conventional products in the art. It will be appreciated that the negative pressure suction mechanism is connected to the control system described above to facilitate the achievement of the relevant functions and effects.

Preferably, the adsorption unit comprises an adsorption shell 6 fixedly connected to the die head body 1, a negative pressure cavity extending along the length direction of the coating opening is constructed in the adsorption shell 6, a plurality of second partition plates are arranged in the negative pressure cavity at intervals along the length direction of the coating opening, and each adsorption flow channel is formed by the separation of the second partition plates. And as further setting, the negative pressure chamber is uncovered in the one side of adsorbing casing 6 and sets up, and should open one side of adsorbing casing 6 is detained and is arranged on die head body 1, adsorbs the mouth and forms between adsorbing casing 6 and die head body 1 to be equipped with the second seal structure of arranging around the negative pressure chamber between adsorbing casing 6 and the die head body 1 outside adsorbing the mouth position, in order to form the sealing treatment to the part region between adsorbing casing 6 and the die head body 1, in order to do benefit to the absorption treatment of realization absorption unit to coating mouth department.

Here, the adsorption casing 6 has the same structural structure as the purge casing 4, and the same material can be preferably used to obtain a relatively optimum use effect.

In order to improve the use effect of the second sealing structure, the second sealing structure comprises a second sealing strip which is clamped between the adsorption shell 6 and the die head body 1, and the second sealing strip is made of fluororubber as a further arrangement. Of course, the second sealing strip mentioned here has the same structure and using effect as the first sealing strip in this embodiment, and will not be described again here.

In addition, in this embodiment, a second protrusion protruding toward one side of the die head body 1 is formed on the adsorption shell 6 outside the position of the adsorption port, the second protrusion is arranged around the negative pressure cavity, and the second sealing strip is arranged attached to the second protrusion; and as a further arrangement the height of the second protrusions is between 1-3 mm. The structural configuration of the second protrusion and the arrangement position of the second protrusion and the second sealing strip can be schematically shown by referring to the relative structure and position of the first protrusion and the first sealing strip in fig. 2.

In addition, in order to improve the coating quality, as shown in fig. 1 to 4, the die body 1 of the present embodiment has an upper die 2 and a lower die 3 which are coupled to each other in a snap-fit manner, a coating opening is formed between the upper die 2 and the lower die 3, a purge mechanism is located on one of the upper die 2 and the lower die 3, and a negative pressure adsorption mechanism is located on the other of the two. Specifically, be equipped with coating gasket 8 between last die head 2 and lower die head 3, coating gasket 8 is last to have the discharge gate, and coating gasket 8's the apex angle chamfer setting that is located discharge gate department to for the convenience of description, chamfer 800 is D1 in coating gasket 8 length direction's right-angle side length, and chamfer 800 is D2 in coating gasket 8 width direction's right-angle side length, and the length ratio D1 of two right-angle sides of chamfer 800: d2 is between 1.0 and 1.2.

The coating die head of this embodiment sweeps unit and air inlet unit 5 through the cooperation setting to can sweep the processing to coating mouth department, simultaneously, set up through the cooperation of absorption unit and air exhaust unit 7, can carry out the negative pressure adsorption to coating mouth department and handle, and then sweep processing and negative pressure adsorption simultaneously to coating mouth department and handle, pile up and lead to the coating unusual in order to avoid taking place the thick liquids, thereby effectively improve coating quality and production efficiency, reduction in production cost.

The blowing channels 400 are sequentially arranged on the blowing unit along the length direction of the coating port, and the blowing ports of the blowing channels 400, which are arranged towards the coating port, are arranged in a slit shape, so that the blowing effect is improved; a plurality of adsorption flow channels are sequentially arranged in the adsorption unit along the length direction of the coating port, and each adsorption flow channel is arranged in a slit shape towards the adsorption port arranged on the coating port, so that the adsorption effect is favorably improved.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coating die comprising a die body (1) having a coating orifice, characterized in that: the coating die is characterized by further comprising a blowing mechanism and a negative pressure adsorption mechanism which are arranged on the die head body (1) and are respectively arranged on two sides of the coating opening, wherein:

the blowing mechanism comprises a blowing unit and an air inlet unit (5), the blowing unit is arranged on the die head body (1), the blowing unit is provided with a plurality of blowing runners (400) which are sequentially arranged along the length direction of the coating opening, one end of each blowing runner (400) is provided with an air inlet (401), and the other end of each blowing runner is provided with a slit-shaped blowing opening which is arranged towards the coating opening; the air inlet unit (5) is arranged on the purging unit, and the air inlet unit (5) is provided with an air inlet pipe (500) connected with an external air source and air inlet branch pipes (501) respectively connected with the air inlet pipe (500) and the air inlets (401);

the negative pressure adsorption mechanism comprises an adsorption unit and an air extraction unit (7), the adsorption unit is arranged on the die head body (1), the adsorption unit is provided with a plurality of adsorption flow channels which are sequentially arranged along the length direction of the coating port, one end of each adsorption flow channel is provided with an air outlet, and the other end of each adsorption flow channel is provided with a slit-shaped adsorption port which is arranged towards the coating port; the air extraction unit (7) is arranged on the adsorption unit, and the air extraction unit (7) is provided with an air extraction pipe (700) connected with an external negative pressure source and air extraction branch pipes (701) respectively connected with the air extraction pipe (700) and the air outlets.

2. The coating die of claim 1, wherein: air inlet control valves are respectively connected in series on each air inlet branch pipe (501), air exhaust control valves are respectively connected in series on each air exhaust branch pipe (701),

the purging mechanism further comprises a pressure detection unit arranged on the purging unit, and the pressure detection unit is provided with a pressure sensor respectively arranged at each purging flow channel (400);

3. The coating die of claim 2, wherein:

the purging unit comprises a purging shell (4) fixedly connected to the die head body (1), a positive pressure cavity extending along the length direction of the coating opening is constructed in the purging shell (4), a plurality of first partition plates (402) are arranged in the positive pressure cavity at intervals along the length direction of the coating opening, and each purging flow passage (400) is formed by the separation of the first partition plates (402);

the adsorption unit comprises an adsorption shell (6) fixedly connected to the die head body (1), a negative pressure cavity extending along the length direction of the coating port is constructed in the adsorption shell (6), a plurality of second partition plates are arranged in the negative pressure cavity at intervals along the length direction of the coating port, and the second partition plates are separated to form adsorption flow channels.

4. The coating die of claim 3, wherein:

the positive pressure cavity is arranged at one side of the purging shell (4) in an open mode, one side of the purging shell (4) at the open mode is buckled on the die head body (1), the purging port is formed between the purging shell (4) and the die head body (1), and a first sealing structure arranged around the positive pressure cavity is arranged between the purging shell (4) and the die head body (1) outside the position of the purging port;

the negative pressure chamber is arranged on one side of the adsorption shell (6) in an open mode, one side of the adsorption shell (6) in the open mode is buckled on the die head body (1), the adsorption port is formed between the adsorption shell (6) and the die head body (1), and a second sealing structure which is arranged around the negative pressure chamber is arranged between the adsorption shell (6) and the die head body (1) and is arranged outside the position of the adsorption port.

5. The coating die of claim 4, wherein: the first sealing structure comprises a first sealing strip clamped between the purging shell (4) and the die head body (1), and the second sealing structure comprises a second sealing strip clamped between the adsorbing shell (6) and the die head body (1).

6. The coating die of claim 5, wherein: the first sealing strip and the second sealing strip are made of fluororubber.

7. The coating die of claim 5, wherein:

forming a first bulge protruding towards one side of the die head body (1) on the purging shell (4) outside the purging port, wherein the first bulge is arranged around the positive pressure cavity, and the first sealing strip is arranged in a manner of being attached to the first bulge;

the die head body (1) is provided with a suction opening, the suction opening is arranged at the position, outside the suction opening, of the suction shell (6), a second bulge is formed on one side of the die head body (1), the second bulge winds around the negative pressure cavity and is arranged, and the second sealing strip is attached to the second bulge.

8. The coating die of claim 7, wherein: the height of the first protrusion and the height of the second protrusion are both between 1 mm and 3 mm.

9. The coating die according to any one of claims 1 to 8, characterized in that: the die head body (1) is provided with an upper die head (2) and a lower die head (3) which are connected in a buckling mode, the coating opening is formed between the upper die head (2) and the lower die head (3), the purging mechanism is located on one of the upper die head (2) and the lower die head (3), and the negative pressure adsorption mechanism is located on the other of the upper die head (2) and the lower die head (3).

10. The coating die of claim 9, wherein: a coating gasket (8) is arranged between the upper die head (2) and the lower die head (3), a discharge hole is formed in the coating gasket (8), a vertex angle of the coating gasket (8) at the discharge hole is chamfered, and the length ratio D1 of two right-angle sides of the chamfer (800): d2 is between 1.0 and 1.2.