CN217615713U

CN217615713U - Extrusion coating die head gasket

Info

Publication number: CN217615713U
Application number: CN202221285549.6U
Authority: CN
Inventors: 叶清; 周雷军
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-10-21
Anticipated expiration: 2032-05-25

Abstract

The utility model discloses an extrusion coating die head gasket, including the gasket main part, the gasket main part is the rectangle ring slice shape that has a breach, the gasket main part is including first separation blade and the second separation blade that is located the breach both sides, constitute the discharge gate of gasket main part between the two, all open the channel on the tip top surface of first separation blade and second separation blade, the channel runs through the gasket main part along the ejection of compact direction of discharge gate and arranges, and the channel includes first runner portion along length direction in proper order, wide-width portion and second runner portion, first runner portion is used for drawing forth the required thick liquids of coating edge region, the width of second runner portion is bigger than first runner portion width, wide-width portion is used for chipping the thick liquids of coating edge region, one side of second runner portion is linked together with the outside end of the discharge gate that corresponds. Through optimizing the structure of discharge gate, can guarantee that the regional stable size of edge skiving of long-time production process effectively reduces the emergence of rolling drum limit anomaly to promote battery production efficiency and quality.

Description

Extrusion coating die head gasket

Technical Field

The utility model relates to a lithium cell coating technical field, concretely relates to extrusion coating die head gasket.

Background

In the manufacturing process of lithium ion batteries, a battery base material is often coated by an extrusion coating process. The coating die head for coating comprises an upper die and a lower die, wherein a gasket is clamped between the upper die and the lower die, a discharge hole is formed in the gasket, a pressure cavity is formed in the die head, and slurry is extruded from the discharge hole through a certain pressure and is uniformly coated on a base material.

In the existing coating production, the dressing drying crack abnormal problem caused by the slurry quality problem, the two common problems of overlarge edge thinning area and coiling and bulging edge are also caused, the production difficulty is brought, and the hidden danger is also brought to the product quality. In order to improve the two problems, the common method is to process a chamfer at the edge of the outer end of the discharge port of the coating gasket, the chamfer can adopt the schemes of arc shape, oblique angle and the like so as to improve the flowing condition of the slurry in the extrusion die head, the scheme has poor stability for improving the rolling drum edge, the rolling drum edge still occurs during long-time production, the size of a thinning area can not be effectively controlled, the surface density and the width of the thinning area are included, the phenomenon that the thinning area of the edge of a pole piece is too large exists, and hidden danger is brought to the quality of a battery.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide an extrusion coating die head gasket, through the structure of optimizing the discharge gate, can the regional size of effective control skiving to the regional stable dimension of edge skiving of guaranteeing long-time production process reduces the unusual emergence in coiling drum limit, promotes battery production efficiency and quality.

In order to solve the technical problem, the utility model discloses an extrusion coating die head gasket, including the gasket main part, the gasket main part is the rectangle ring slice that has a breach, the gasket main part is including being located the first separation blade and the second separation blade of breach both sides, first separation blade with regional constitution between the terminal surface of second separation blade the discharge gate of gasket main part, first separation blade with all open the channel on the tip top surface of second separation blade, the channel is followed the ejection of compact direction of discharge gate runs through the gasket main part is arranged, just the channel includes first runner portion, widened portion and second runner portion along length direction in proper order, first runner portion is used for drawing the required thick liquids of coating edge area, the width ratio of second runner portion first runner portion width is big, widened portion is used for connecting first runner portion with second runner portion, widened portion is used for skiving the thick liquids of coating edge area, one side of second runner portion and corresponding the outside end of discharge gate is linked together.

In the extrusion coating die head gasket, the first baffle and the second baffle at two sides of the discharge port are symmetrically provided with the channels respectively for independently leading out the slurry required by coating the edge areas at two sides, so that the coating edge area and the main coating area are separately controlled, the slurry consumption of the edge thinning area is effectively controlled, and the size control of the thinning area is facilitated; the tail end of the channel is provided with the widening part, so that the slurry flow led out from the first flow channel part is thinned, the width of the coating edge area and the thinning value of the surface density can be effectively controlled by controlling the widening degree of the widening part, and the occurrence of coiling drum edge abnormity is reduced; through tightly establishing second runner portion behind the widen part, not only leading to the thick liquids stream that thins through the widen part, the edge of guaranteeing long-time production process is cut thin regional stably, effectively improves and rolls up drum limit phenomenon to with the thick liquids intercommunication of feed inlet department, guarantee that final coating result is not influenced, promote battery production efficiency and quality.

As the utility model discloses the improvement of extrusion coating die head gasket, the gasket main part is still including locating the third separation blade at discharge gate back, connection first separation blade with the fourth separation blade and the connection of third separation blade tip the second separation blade with the fifth separation blade of third separation blade tip, third separation blade, fourth separation blade with all be provided with a plurality of fixed orificess on the fifth separation blade, the fixed orifices is used for counterpointing the installation with the coating die head.

The fixing holes are mainly holes of fixing screws and are aligned with the coating die head.

Furthermore, the both ends of third separation blade all are provided with the ear position to outside convex, the ear position is used for right the mounted position of gasket main part finely tunes.

The ear position is convenient for the feeding and discharging of the gasket during the integral installation, and the installation position can be finely adjusted, so that the installation efficiency is improved.

As another improvement of the extrusion coating die head gasket of the present invention, the first flow channel portion is a rectangular groove structure, the widening portion is a horn-shaped structure, and the cross section of the second flow channel portion is L-shaped, so that the second flow channel portion is communicated with the discharge port.

Further, the groove depths of the first flow channel part, the widened part and the second flow channel part are the same and are all 40% -60% of the thickness of the gasket main body. The depth of the channels is the same, which is convenient for processing.

Meanwhile, when the width of each part is fixed, the groove depth influences the slurry amount of the coating edge area, further influences the surface density of the coating edge area, can be adjusted to meet different thinning area surface density requirements, and preferably is 40% -60% of the thickness of the gasket main body.

Further, the length of the first flow channel part is 50% -80% of the length of the discharge hole. The first runner part can ensure stable feeding of the edge area during long-time coating production, and the length can be adjusted according to the overall design.

Further, the width of the second flow channel part is 1.4 to 1.6 times of the width of the first flow channel part. The second runner part can further ensure that the feeding of the edge area is stable during long-time coating production, and the width can be adjusted according to the overall design.

Furthermore, the side walls of the widened portion are smoothly transited from the side walls of the first flow channel portion and the second flow channel portion.

In conclusion, by adopting the extrusion coating die head gasket, the slurry flow of the coating edge area and the slurry flow of the main coating area are separately controlled by optimizing the structure of the discharge hole, the area density and the width range of the dressing thinning area can be effectively controlled, the generation of coiling and bulging edges is reduced, the slurry in the coating edge area is guided after being thinned, and the stability of the edge thinning area in the long-time production process can be ensured.

Drawings

In the drawings:

fig. 1 is an overall structure diagram of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

In the figure, 11, a first baffle plate; 12. a second baffle plate; 13. a third baffle plate; 14. a fourth baffle plate; 15. a fifth baffle plate; 2. a discharge port; 3. a channel; 31. a first flow path portion; 32. a widening section; 33. a second flow path portion; 4. a fixing hole; 5. the ear position.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

Fig. 1-2 illustrate an extrusion coating die shim of the present invention. As shown in fig. 1 and 2, the extrusion coating die head gasket includes a gasket body, the gasket body is in a rectangular ring shape with a notch, the gasket body includes a first blocking piece 11 and a second blocking piece 12 located at two sides of the notch, a discharge port 2 of the gasket body is formed by an area between end faces of the first blocking piece 11 and the second blocking piece 12, channels 3 are respectively opened on top surfaces of end portions of the first blocking piece 11 and the second blocking piece 12, the channels 3 are arranged through the gasket body along a discharge direction of the discharge port 2, the channels 3 sequentially include a first flow channel portion 31, a widening portion 32 and a second flow channel portion 33 along a length direction, the first flow channel portion 31 is used for leading out slurry required by a coating edge area, a width of the second flow channel portion 33 is larger than a width of the first flow channel portion 31, the widening portion 32 is used for connecting the first flow channel portion 31 and the second flow channel portion 33, the widening portion 32 is used for thinning the slurry of the coating edge area, and one side of the second flow channel portion 33 is communicated with a corresponding outer side portion of the discharge port 2.

When the sizing agent is used, sizing agent for coating the middle area is ejected from the discharge port 2, sizing agent for coating the edge areas at two sides is ejected from the channels 3 of the first baffle plate 11 and the second baffle plate 12 respectively, and is guided by the first flow channel part 31 and is independently led out, the size of the sizing agent flow can be controlled, and the size of a subsequent thinning area can be further controlled; then the slurry flow led out from the channel 3 is thinned through the widening part 32 to form an edge coating slurry flow with certain width and surface density, and through reasonable design of groove depth and the width of the widening part 32, a better thinning effect can be obtained, and the width and surface density reduction value of the coating edge area is controlled; and finally, the slurry flows into the second flow channel part 33, the edge thinning area in the long-time production process is ensured to be stable through the guiding of the second flow channel part 33, the abnormal edge coiling and bulging is effectively reduced, the slurry is converged with the slurry flowing out through the discharge hole 2 and is ejected together, the final coating result is not influenced, and the production efficiency and the quality of the battery are improved.

As shown in fig. 1, the gasket main body further comprises a third blocking piece 13 arranged at the back of the discharge port 2, a fourth blocking piece 14 connected with the end portions of the first blocking piece 11 and the third blocking piece 13, and a fifth blocking piece 15 connected with the end portions of the second blocking piece 12 and the third blocking piece 13, wherein a plurality of fixing holes 4 are formed in the third blocking piece 13, the fourth blocking piece 14 and the fifth blocking piece 15, and the fixing holes 4 are used for being aligned with the coating die head. The fixing hole 4 is mainly a fixing screw hole position and is arranged in an alignment mode with the coating die head.

The both ends of third barrier 13 all are provided with ear position 5 to the outside bulge, and ear position 5 is convenient for the upper and lower unloading when gasket integrated erection, can finely tune mounted position simultaneously, improves the installation effectiveness.

As shown in fig. 2, the first flow path portion 31 has a rectangular groove structure, the widened portion 32 has a bell-mouth shape, and the second flow path portion 33 has an L-shaped cross section so as to pass through the second flow path portion 33 and the discharge port 2.

Optionally, the groove depths of the first flow channel part 31, the widened part 32 and the second flow channel part 33 are the same and are all 40% to 60% of the thickness of the gasket body. The depth of the channels 3 is the same, which facilitates the processing.

Optionally, the length of the first flow channel part 31 is 50% to 80% of the length of the discharge hole 2. The first flow channel part 31 can ensure stable feeding of the edge area in long-time coating production, and the length can be adjusted according to the overall design.

Optionally, the width of the second flow channel part 33 is 1.4 to 1.6 times the width of the first flow channel part 31. The second flow path portion 33 can further ensure stable feeding of the edge area in the long-time coating production, and the width can be adjusted according to the overall design.

Optionally, the sidewalls of the widened portion 32 of the first flow channel portion 31 and the second flow channel portion 33 are smoothly transitioned.

Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that various changes, modifications and equivalents can be made to the embodiments of the invention after reading the present invention, and such changes, modifications and equivalents are within the scope of the claims.

Claims

1. An extrusion coating die shim, comprising a shim body, wherein the shim body is in a rectangular ring shape with a notch, the shim body comprises a first blocking piece (11) and a second blocking piece (12) which are positioned at two sides of the notch, an area between end faces of the first blocking piece (11) and the second blocking piece (12) forms a discharge port (2) of the shim body, the top faces of end portions of the first blocking piece (11) and the second blocking piece (12) are both provided with a channel (3), the channel (3) is arranged through the shim body along a discharge direction of the discharge port (2), the channel (3) sequentially comprises a first flow channel portion (31), a widened portion (32) and a second flow channel portion (33) along a length direction, the first flow channel portion (31) is used for leading out slurry required for coating an edge area, the width of the second flow channel portion (33) is larger than the width of the first flow channel portion (31), the widened portion (32) is used for connecting the first flow channel portion (31) and the second flow channel portion (33), and the widened portion (32) is used for connecting the outer side of the second flow channel portion (33) corresponding to the thinned slurry.

2. The extrusion coating die head gasket as recited in claim 1, wherein the gasket body further comprises a third baffle (13) arranged at the back of the discharge port (2), a fourth baffle (14) connecting the ends of the first baffle (11) and the third baffle (13), and a fifth baffle (15) connecting the ends of the second baffle (12) and the third baffle (13), wherein a plurality of fixing holes (4) are formed in the third baffle (13), the fourth baffle (14) and the fifth baffle (15), and the fixing holes (4) are used for being installed in an aligned manner with the coating die head.

3. The extrusion coating die shim according to claim 2, wherein the third baffle (13) is provided with lugs (5) protruding outwards at both ends, and the lugs (5) are used for fine adjustment of the installation position of the shim body.

4. The die shim according to claim 1, wherein the first flow channel portion (31) has a rectangular groove structure, the widened portion (32) has a flared structure, and the second flow channel portion (33) has an L-shaped cross section, so that the second flow channel portion (33) communicates with the discharge port (2).

5. The extrusion coating die shim according to claim 1 or 4, wherein the first flow channel portion (31), the widened portion (32) and the second flow channel portion (33) have the same groove depth and are each 40% to 60% of the shim body thickness.

6. The extrusion coating die shim according to claim 1 or 4, wherein the length of the first flow channel portion (31) is 50% to 80% of the length of the discharge port (2).

7. The extrusion coating die shim according to claim 1 or 4, wherein the width of the second flow channel portion (33) is 1.4 to 1.6 times the width of the first flow channel portion (31).

8. Extrusion coating die shim according to claim 1 or 4, characterized in that the side walls of the widening (32) are rounded off from the side walls of the first flow channel part (31) and the second flow channel part (33).