CN218251178U - Coating machine die head and coating machine - Google Patents

Abstract

The utility model provides a coating machine die head and coating machine, the utility model discloses a coating machine die head is including the cavity of shaping in the die head, with the feed unit of cavity intercommunication to and locate on the die head and communicate the lip of cavity. Wherein, along the length direction of the lip, a plurality of backflow channels which are arranged at the lip part at intervals are formed in the die head; the die head is provided with a plurality of return pipes which are respectively communicated with the return channels, and each return pipe is provided with a flow control valve. In particular operation, the slurry supplied from the chamber to the lip may be partially discharged through the return channel and the return pipe. Compared with the existing coating machine die head, the coating machine of the utility model forms a plurality of backflow channels inside the die head, so that the slurry at the lip can partially flow back; and the transverse surface density of the pole piece is changed by adjusting the flow of each return pipeline, so that the surface density of each area on the pole piece can meet the process requirement.

Description

Coating machine die head and coating machine

Technical Field

The utility model relates to a battery pole piece coating technical field, in particular to coating machine die head. Additionally, the utility model discloses still relate to a coating machine.

Background

In the industrial environment of automobiles using traditional energy as power supply, the problem of environmental pollution has led to attention on environmental protection and resource utilization. The new energy automobile is actively developed, the electrification of the automobile industry is realized, and the consumption of traditional high-pollution energy such as petroleum can be effectively reduced; therefore, new energy automobiles adopting power batteries are increasingly widely popularized and popularized.

The manufacturing technology of the lithium ion battery is a key technology for the development of the electric automobile, coating is a necessary process in the production process of the lithium battery, the consistency of the coating surface density is very important for improving the performance of the battery and ensuring the safety of the battery, and if the consistency of the coating surface density of the positive electrode is poor, the capacity of the battery is influenced, so that the performance of the battery is not up to the standard; if the consistency of the negative coating surface density is poor, the interface of the battery pole piece is poor, and further safety accidents are caused.

The surface density of an area of a pole piece is mainly adjusted by an adjusting bolt or a T-shaped adjusting block in the existing coating equipment. In the process of long-term use of the die head, the adjusting bolt can cause the deflection deformation of the die head, so that the surface density cannot be adjusted; after the T-shaped adjusting block is used for a long time, the material leakage condition can occur after the adjusting block is abraded, and further the consistency of the coating surface density is poor. The method for adjusting the area density of the pole piece area has certain limitations, and the problem of poor consistency of the area density of the pole piece area is difficult to solve well.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a coating machine die head, so as to adjust the transverse surface density of the pole piece coating slurry.

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

a die head of a coating machine comprises a cavity formed in the die head, a feeding unit communicated with the cavity and a lip opening arranged on the die head and communicated with the cavity; a plurality of backflow channels which are arranged at the lip part at intervals are formed in the die head along the length direction of the lip; the die head is provided with a plurality of return pipes which are respectively communicated with the return channels, and each return pipe is provided with a flow control valve; the slurry supplied from the cavity to the lip may be partially discharged through the return passage and the return pipe.

Furthermore, the return channels are uniformly arranged, and the distance between every two adjacent return channels is 30-150 mm.

Furthermore, the die head comprises an upper die head and a lower die head which are buckled into a whole, the cavity is formed on the lower die head, and each backflow channel and the backflow pipe are arranged on the upper die head.

Furthermore, the return pipes are uniformly distributed at intervals at the top of the upper die head.

Further, the coating machine die head is provided with a main return pipeline, and each return pipe is communicated with the main return pipeline.

Furthermore, a collecting pipe is communicated between the main return pipeline and each return pipe; the collector pipes are arranged along the length direction.

Furthermore, the main return pipeline is communicated with the feeding unit, and a check valve is arranged on the main return pipeline, so that the slurry discharged through the return channel and the return pipe flows back to the feeding unit.

Further, the feeding unit comprises a storage bin, a feeding pipeline communicated between the storage bin and the cavity, and a feeding pump arranged on the feeding pipeline; the main return pipeline is communicated to the storage bin or the feeding pipeline.

Furthermore, a circulating pipeline is communicated between the feeding pipeline and the storage bin at the downstream of the feeding pump, and a control valve is arranged on the circulating pipeline.

Compared with the prior art, the utility model discloses a coating machine die head has following advantage:

the utility model discloses a coating machine die head, through the length direction along the lip, the shaping has a plurality of intervals to arrange in the backward flow passageway at lip position in the die head, can realize the thick liquids backward flow of lip department each position, through setting up the back flow with each backward flow passageway intercommunication, and set up flow control valve on each back flow, can adjust the reflux volume of thick liquids, the pressure that makes lip department each position thick liquids is at suitable within range, be convenient for at the in-process of production lithium cell, when carrying out the coating process, keep the uniformity that the pole piece transversely goes up the face density to accord with the technological requirement through the adjustment.

Through making each backward flow passageway evenly arrange, and adjacent two the interval of backward flow passageway is between 30 ~ 150mm, the corresponding region of lip mouth department also segments, and the regulation of the thick liquids subregion of lip mouth department that can be better controls the thick liquids flow everywhere of lip mouth, guarantees the uniformity of pole piece horizontal surface density.

Simultaneously, on all locating last die head with each return passage and back flow, can make the structure and the mode of arranging of each return passage and back flow simpler, simultaneously, through locating the top of last die head with each back flow, the arranging of each back flow of being convenient for to can make the framework of whole die head simpler, be convenient for production and assembly.

In addition, set up the check valve on total back flow path, can make the thick liquids through backward flow passageway and back flow exhaust backward flow to the feed unit to can guarantee that the thick liquids in the feed unit can not get into in the backward flow, cause the influence to the regional areal density of pole piece. The circulating pipeline is arranged between the feeding pipeline and the storage bin, and the control valve is arranged on the circulating pipeline, so that the slurry in the storage bin can be maintained in a flowing state even after the coating machine stops working while the start and stop of the coating machine can be controlled, and the deposition of the slurry in the storage bin can be prevented; meanwhile, by arranging the circulating pipeline, the slurry can be ensured to be quickly responded after the coating machine is started, and the coating work can be quickly unfolded conveniently.

Another object of the utility model is to provide a coating machine sets the surface density appearance that is used for detecting pole piece coating thick liquids surface density, the coating machine adopts the coating machine die head.

Coating machine and aforementioned coating machine die head have the same beneficial effect for prior art, no longer give unnecessary details here.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to further understand the present disclosure, and the exemplary embodiments and descriptions thereof are used to explain the present disclosure, wherein the related front and back, upper and lower, and other words are only used to represent relative positional relationships, which do not constitute an improper limitation of the present disclosure. In the drawings:

fig. 1 is a schematic view of an overall structure of a coating machine die head according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of an internal structure of a die head of a coating machine according to the first embodiment of the present invention.

Description of the reference numerals:

1. a supply unit; 10. a feed pump; 100. a feed line; 11. a storage bin; 12. a circulation line; 13. a control valve;

2. a die head; 20. a cavity; 200. a lip; 201. a return channel; 21. an upper die head; 22. a lower die head;

3. a header pipe; 30. a main return line; 300. a return pipe; 301. a flow control valve; 302. a check valve;

4. and (7) a 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.

Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless expressly limited otherwise. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present invention can be understood in conjunction with the specific situation for a person of ordinary skill in the art.

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

Example one

The utility model relates to a coating machine die head, which comprises a cavity formed in the die head, a feeding unit communicated with the cavity, and a lip arranged on the die head and communicated with the cavity; a plurality of backflow channels which are arranged at the lip part at intervals are formed in the die head along the length direction of the lip; a plurality of backflow pipes which are respectively communicated with the backflow channels are arranged on the die head, and flow control valves are arranged on the backflow pipes; the slurry supplied from the chamber to the lip may be partially discharged through the return passage and the return pipe.

Based on the above design concept, an exemplary structure of the coating machine die head of the present embodiment is shown in fig. 1 to fig. 2, wherein the supply unit 1 is connected to the cavity 20 of the die head 2, and the slurry flows from the supply unit 1 into the cavity 20 of the die head 2 and flows to the electrode plate to be coated through the lip 200 disposed on the die head 2 and connected to the cavity 20, thereby completing the coating process; meanwhile, a plurality of backflow channels 201 which are arranged at intervals are arranged at the lip 200 part in the die head 2 along the length direction of the lip 200, a backflow pipe 300 which is connected with each backflow channel 201 is arranged on the die head 2, a flow control valve 301 is arranged on each backflow pipe 300, and the backflow amount of the slurry at the lip 200 part can be changed by adjusting the flow control valve 301, so that the transverse surface density in the coating process can be controlled.

In this embodiment, the feeding unit 1 includes a storage bin 11, a feeding pipeline 100 connected between the storage bin 11 and the cavity 20, and a feeding pump 10 disposed on the feeding pipeline 100, the slurry is stored in the storage bin 11, when the coating operation is started, the liquid in the storage bin 11 is pumped by the feeding pump 10 to enter the feeding pipeline 100, the feeding pipeline 100 is connected to the cavity 20 in the die head 2, and the slurry flows into the cavity 20 through the feeding pipeline 100.

The specific structure of the die head 2 is as shown in fig. 2, and the die head 2 includes an upper die head 21 and a lower die head 22 which are buckled into a whole, a cavity 20 for storing slurry is arranged on the lower die head 22, in order to enable the slurry of the cavity 20 to smoothly flow into the lip 200, the position of the lip 200 is removed between the upper die head 21 and the lower die head 22, and gaskets 4 are arranged at other gaps, so that the slurry can be prevented from overflowing from other positions except the lip 200, meanwhile, the cross section of the cavity 20 is semicircular, one side of the cavity 20 close to the lip 200 is set to be a slope, and the slurry in the cavity 20 can more favorably flow into the lip 200.

As shown in fig. 2, the lip 200 is located at the right side of the die head 2, and is a slit formed between the upper die head 21 and the lower die head 22, and in order to enable the slurry of the lip 200 to have sufficient pressure so as to enable the coated areal density to meet the process requirements, the size of the lip 200 is specifically determined according to the spatial size of the cavity 20 and the areal density requirement of the pole piece.

In this embodiment, under the condition that the size of the cavity 20 inside the die head 2 and the size of the lip 200 are determined, the longitudinal fluctuation of the pole piece areal density is mainly adjusted by adjusting the feed pump 10, in order to adjust the pole piece areal density and improve the consistency of the pole piece areal density, a plurality of backflow channels 201 communicated with the lip 200 are arranged on the upper die head 21 along the length direction of the lip 200, so that the slurry at the lip 200 can flow back, thereby adjusting the slurry amount at the lip 200, and in order to make the slurry flow back more smoothly, the positions where the backflow channels 201 are communicated with the lip 200 are set to be trapezoidal, the lower end is larger, the upper end is smaller, thereby increasing the pressure of the slurry in the backflow channels 201 and facilitating the backflow thereof; meanwhile, in order to adjust the slurry amount in different regions of the lip 200, the distance between two adjacent return channels 201 is set to be 30-150 mm.

The die head 2 is provided with return pipes 300 which are respectively connected with the return channels 201, as shown in fig. 1, the return pipes 300 are uniformly arranged at intervals at the top of the upper die head 21, in order to adjust the flow of the returned slurry, each return pipe 300 is provided with a flow control valve 301, and the flow of the returned slurry in each return channel 201 is influenced by adjusting the flow control valve 301 at each position, the slurry amount at the corresponding position on the lip 200 is further influenced, and the coated surface density is further adjusted.

The backflow slurry flows into the main backflow pipeline 30 through the collecting pipe 3 in the backflow pipe 300, wherein the collecting pipe 3 is arranged along the length direction of the die head 2 and is respectively communicated with the main backflow pipeline 30 and each backflow pipe 300, the structure is simple, the installation is convenient, the main backflow pipeline 30 is communicated with the feeding pipeline 100, and the backflow slurry flows into the feeding pipeline 100 through the main backflow pipeline 30 so as to participate in the coating work again; meanwhile, in order to prevent the slurry in the feed line 100 from entering the return pipe 300 and affecting the surface density of the pole pieces, a check valve 302 is further disposed on the main return line 30, so that the slurry can only enter the feed line 100 through the return pipe 300.

It should be noted that, in this embodiment, the total return line 30 is communicated with the feed line 100, so that the return slurry enters the feed line 100 only as a preferred mode, and thus, the overall structure is simpler, and the installation is more convenient, and secondly, the total return line 30 can be directly connected with the storage bin 11, and when the concrete implementation is performed, different design modes can be selected according to actual spatial positions and specific requirements.

As shown in fig. 1, a circulation line 12 is connected between a supply line 100 downstream of the supply pump 10 and the storage bin 11, and a control valve 13 is provided in the circulation line 12 to control the start and stop of the coating operation. When the coating operation is started, the control valve 13 is closed, and the slurry flows into the cavity 20 of the die head 2 through the feed pipe 100; when the coating operation is stopped, the feed pump 10 may be turned off, or the control valve 13 may be opened, so that the slurry flows into the circulation line 12 through the feed line 100 and flows back into the storage silo 11 through the circulation line 12. In this way, the slurry in the storage silo 11 can be maintained in a flowing state after the coating operation is stopped, and the slurry can be prevented from being deposited in the storage silo 11 or from being deposited at the feed pump 10. Meanwhile, the circulating pipeline 12 is arranged, so that the feeding pump 10 and the feeding pipeline 100 can be filled with the slurry all the time, and the slurry can be quickly responded when the coating work is started, so that the coating work can be quickly unfolded.

The utility model discloses a coating machine die head, through the length direction along lip 200, the shaping has a plurality of intervals to arrange in the return channel 201 at lip 200 position in die head 2, can realize the thick liquids backward flow of lip 200 department each position, through setting up the back flow 300 with each return channel 201 intercommunication, and set up flow control valve 301 on each back flow 300, can adjust the backward flow volume of thick liquids, and then the thick liquids volume of adjustment lip 200 each department, thereby adjust the horizontal surface density of pole piece coating thick liquids.

Example two

The present embodiment relates to a coating machine equipped with an area density meter for detecting the area density of the pole piece coating slurry, and the coating machine of the present embodiment is equipped with the coating machine die head of the first embodiment, so that the flow control valve 301 corresponding to the position not meeting the area density requirement can be adjusted according to the data on the area density meter, and the transverse area density of the pole piece coating slurry can meet the process requirement.

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 (10)

1. A die head of a coating machine comprises a cavity (20) formed in a die head (2), a feeding unit (1) communicated with the cavity (20), and a lip (200) arranged on the die head (2) and communicated with the cavity (20); the method is characterized in that:

a plurality of backflow channels (201) which are arranged at the lip opening (200) part at intervals are formed in the die head (2) along the length direction of the lip opening (200);

a plurality of return pipes (300) which are respectively communicated with the return channels (201) are arranged on the die head (2), and each return pipe (300) is provided with a flow control valve (301);

the slurry supplied from the cavity (20) to the lip (200) may be partially discharged through the return channel (201) and the return pipe (300).

2. The coater die according to claim 1, wherein:

the backflow channels (201) are uniformly distributed, and the distance between every two adjacent backflow channels (201) is 30-150 mm.

3. The coater die according to claim 1, wherein:

the die head (2) comprises an upper die head (21) and a lower die head (22) which are buckled into a whole;

the cavity (20) is formed on the lower die head (22);

each of the return channels (201) and the return tubes (300) is provided on the upper die head (21).

4. The coater die according to claim 3, wherein:

the return pipes (300) are arranged at the top of the upper die head (21) at intervals and uniformly.

5. The coater die according to any one of claims 1 to 4, wherein:

the coating machine die head is provided with a main return pipeline (30), and each return pipe (300) is communicated with the main return pipeline (30).

6. The coater die according to claim 5, wherein:

a collecting pipe (3) is communicated between the main return pipeline (30) and each return pipe (300);

the collecting pipe (3) is arranged along the length direction.

7. The coater die according to claim 5, wherein:

the main return pipeline (30) is communicated with the feeding unit (1), and a check valve (302) is arranged on the main return pipeline (30) so that the slurry discharged through the return channel (201) and the return pipe (300) flows back to the feeding unit (1).

8. The coater die according to claim 7, wherein:

the feeding unit (1) comprises a storage bin (11), a feeding pipeline (100) communicated between the storage bin (11) and the cavity (20), and a feeding pump (10) arranged on the feeding pipeline (100);

the main return line (30) is connected to the storage bin (11) or the feed line (100).

9. The coater die according to claim 8, wherein:

and a circulating pipeline (12) is communicated between the feeding pipeline (100) positioned at the downstream of the feeding pump (10) and the storage bin (11), and a control valve (13) is arranged on the circulating pipeline (12).

10. A coater equipped with an areal density meter for detecting the areal density of a pole piece coating slurry, characterized in that the coater employs a coater die head according to any one of claims 1 to 9.

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