CN211303649U - Coating gasket, extrusion die head comprising coating gasket and coating device - Google Patents
Coating gasket, extrusion die head comprising coating gasket and coating device Download PDFInfo
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- CN211303649U CN211303649U CN201922128618.7U CN201922128618U CN211303649U CN 211303649 U CN211303649 U CN 211303649U CN 201922128618 U CN201922128618 U CN 201922128618U CN 211303649 U CN211303649 U CN 211303649U
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Abstract
The utility model discloses a coating gasket, an extrusion die head and a coating device comprising the coating gasket, wherein the coating gasket comprises a gasket main body and a first bulge part, and the gasket main body is provided with a runner with one open end; the first protruding part is arranged at the other end, far away from the opening, of the flow channel, and is distributed according to a preset rule according to the flow rate of the slurry at the corresponding position in the flow channel along the direction of the width of the flow channel. The protruding heights of the first protruding parts are arranged according to the size distribution of the slurry flow, the consistency of the slurry flow at each position of the flow channel can be improved, the excessive slurry at the position of the coating area is avoided, the coating is too thick, and the weight consistency of the coating area is improved.
Description
Technical Field
The utility model relates to a coating technical field, in particular to coating gasket, including extrusion die and coating unit of this kind of coating gasket.
Background
Extrusion coating is one of the methods commonly used to coat pole pieces. In the production process of lithium batteries, the cell capacity consistency is a key parameter for measuring electrical performance, the capacity consistency is determined by the coating weight consistency, and the coating weight consistency is often influenced by a gasket in extrusion coating equipment, so the gasket design is very critical. The coating weight uniformity includes the edge uniformity of the coating film zone and the center region uniformity of the coating film zone. Generally, as shown in fig. 1, the coating pad a controls the edge weight of the coating region c by the chamfer b, thereby preventing the occurrence of the bead phenomenon. After coating, the pole piece was formed with "zebra stripes" in which the coating area c and the blank area d were sequentially spaced as shown in fig. 2. However, due to the inconsistent pressure of the extrusion die cavity, the flow rate of the slurry in the middle area of the coating area is inconsistent, so that the transverse weight consistency of the middle area of the coating area is poor, and the final coating weight distribution is in a parabolic shape (also called a mountain peak shape) as shown in fig. 3, wherein the ordinate in fig. 3 is the coating weight in mg and the abscissa is the width dimension of the pole piece in cm.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the embodiment of the utility model provides a coating gasket, including this kind of coating gasket's extrusion die and coating unit.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
the embodiment of the utility model provides a coating gasket, the coating gasket comprises a gasket main body and a first bulge, wherein the gasket main body is provided with a flow channel with an opening at one end; the first protruding part is arranged at the other end, far away from the opening, of the flow channel, and is distributed according to a preset rule according to the flow rate of the slurry at the corresponding position in the flow channel along the direction of the width of the flow channel.
In the above scheme, the preset rule includes a projection along the extending direction of the flow channel, and the first protruding portion is located at the central position of the flow channel opening.
In the above scheme, the preset rule further includes that the protruding height of the first protruding portion is in direct proportion to the flow rate of the slurry at the corresponding position in the flow channel.
In the above aspect, the first protruding portion is shaped like a wedge, an arch, a cylinder, a cuboid, or a square.
In the above scheme, the coating gasket further comprises second protruding parts, and the second protruding parts are arranged on two sides of the flow channel.
In the above scheme, the distance between the second protrusion and the opening satisfies a preset value.
In the above scheme, the coating gasket main body comprises a base, a shunt part and side seats, the side seats are respectively arranged at two ends of the base, and at least one shunt part is arranged between the two side seats;
the flow passages are formed between the flow dividing parts and the side seats and between two adjacent flow dividing parts;
the first protruding portion is arranged on the base, and the second protruding portion is arranged on the flow dividing portion and the side seat.
In the above scheme, along the extending direction of the flow channel, the vertical distances between the positions of the second protruding portion on the side surface close to the center of the flow channel and the corresponding side seats or the flow dividing portions are equal.
The embodiment of the utility model provides an extrusion die head is still provided, extrusion die head includes die head, lower die head and any kind of above-mentioned coating gasket, the coating gasket sets up go up the die head with between the lower die head.
The embodiment of the utility model provides a coating device is still provided, coating device includes back roll and any kind of extrusion die of the aforesaid, the back roll with the interval has between the extrusion die, just the opening with the back roll sets up relatively.
The utility model provides a coating gasket, including extrusion die and coating unit of this kind of coating gasket, through setting up first bulge in the bottom of runner, first bulge has the vortex effect to the thick liquids in the runner, sets up the uniformity that first bulge can improve the thick liquids flow of each position department of runner according to thick liquids flow size distribution to it is too much to have avoided the regional position thick liquids of filming, and the coating is too thick, has improved the weight uniformity of filming district.
Drawings
FIG. 1 is a schematic diagram of a prior art coated gasket;
FIG. 2 is a schematic view of a pole piece structure after coating by using the coating pad in FIG. 1;
FIG. 3 is a graph showing the coating weight distribution of the coated electrode sheet of FIG. 2;
FIG. 4 is a schematic view of an alternative construction of a coated gasket in accordance with the present invention;
FIG. 5 is a schematic view of another alternative construction of a coated gasket in accordance with the present invention;
FIG. 6 is an enlarged view taken at A in FIG. 5;
FIG. 7 is a graph showing the coating weight distribution of the coated pole piece using the coating shim of FIG. 5;
FIG. 8 is a schematic view of an alternative construction of a coated gasket in an embodiment of the invention;
fig. 9 is a schematic view of an alternative structure of an extrusion die according to an embodiment of the present invention;
fig. 10 is a schematic view of an alternative structure of a coating apparatus according to an embodiment of the present invention.
Reference numerals:
coating the gasket 10; an opening 11; a flow channel 12; a gasket main body 20; a base 21; a side seat 22; a flow dividing section 23; chamfering 24; the first sheet 25; a second sheet 26; the first projecting portion 30; the second projecting portion 40; the side 41 of the second projection near the center of the flow channel; a mounting hole 50; an extrusion die head 60; an upper die 61; a lower die 62; a backing roll 70; a pole piece 80.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, belong to the scope of protection of the invention.
In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientation or positional relationship shown in fig. 4.
The embodiment of the first aspect of the present invention provides a coating gasket, the coating gasket 10 includes a gasket main body 20 and a first protrusion 30, the gasket main body 20 is provided with a flow channel 12 with an opening 11 at one end; the first protrusion 30 is disposed at the other end of the flow channel 12 far from the opening 11, and along the width direction of the flow channel 12, the first protrusion 30 is distributed according to a preset rule according to the flow rate of the slurry at the corresponding position in the flow channel 12.
The slurry flows out from the flow channel 12 to the opening 11, and the size of the opening 11 is matched with the width of the coating area of the pole piece 80. The first protruding parts 30 are arranged according to the distribution condition of the flow of the slurry in the flow channel 12 by utilizing the turbulent flow effect of the first protruding parts 30, so that the consistency of the flow of the slurry at each position of the flow channel 12 is improved, and the consistency of the coating weight of the coating area, especially the middle area of the coating area is improved. The problem that the coating at the part of the coating area is too thick is reduced or even avoided, and more pole pieces can be coated by the slurry with the same weight, so that the manufacturing cost is reduced.
In some embodiments of the present invention, the predetermined rule includes the first protrusion 30 being located at a position of the flow channel 12 where the flow rate of the slurry is relatively large.
"the flow rate of the slurry is large" means that the flow rate of the slurry at a certain position is larger than that at other positions or the flow rate of the slurry at a certain position is larger than that at the adjacent position along the width direction of the flow channel 12. For example, the location where the flow rate of the slurry is large is the location where the flow rate of the slurry in the flow channel 12 is maximum. For another example, generally, the flow rate of the slurry in the middle portion of the flow channel 12 is large and the flow rates on both sides are small in the direction of the width of the flow channel 12, and in the case where the first projecting portion 30 is not provided, the coating weight distribution in the coating film region takes a parabolic shape as shown in fig. 3. At this time, as shown in fig. 4, the position where the flow rate of the slurry is large, that is, the corresponding position of the bottom of the flow channel 12 corresponding to the parabolic convex area, is approximately the middle of the flow channel 12. At this time, the first projecting portion 30 is located at a central position of the opening 11 of the flow channel 12 in a projection in the extending direction of the flow channel 12. After the first protrusion 30 is provided at this position, the flow rate of the slurry at the corresponding position is reduced, and the consistency of the weight of the middle area of the coating area is improved.
At this time, the shape of the first protrusion 30 may not be limited, for example, the shape of the first protrusion 30 includes, but is not limited to, a wedge shape, an arch shape, a cylindrical shape, a rectangular parallelepiped shape, or a square shape.
Further, the predetermined rule further includes that the protruding height of the first protrusion 30 is proportional to the flow rate of the slurry at the corresponding position in the flow channel 12. Generally, the flow rate of the slurry is reduced along with the increase of the protruding degree of the first protrusion 30, the protruding height of the first protrusion 30 corresponding to the position where the flow rate of the slurry is small is set to be small, and the protruding height of the first protrusion 30 corresponding to the position where the flow rate of the slurry is large is set to be large, so that the accuracy of the turbulent flow effect of the first protrusion 30 is improved, and the weight consistency of the middle area of the coating area is further improved.
For example, in the case where the flow rate of the slurry is distributed in a parabolic shape, the protruding height of the first projecting portion 30 gradually increases from both sides of the width of the flow channel 12 to the middle. As shown in fig. 4, 5 and 8, the shape of the first projecting member 30 is preferably wedge-shaped. As shown in FIG. 7, the ordinate in FIG. 7 is the coating weight in mg, and the abscissa is the width dimension of the pole piece 80 in cm. After the wedge-shaped first protruding part 30 is arranged, the consistency of the slurry flow at each position in the flow channel 12 is further improved, and the weight distribution of the middle area of the coating area is in an approximate plain shape.
In some examples of the present invention, as shown in fig. 4, the coating amount at the edge of the coating film region may be adjusted by providing a chamfer 24 at the opening 11. Although the method can avoid the occurrence of the thick edge phenomenon, the coating weight at the edge of the coating area is gradually increased from the edge to the middle area, which easily causes the poor consistency of the coating weight at the edge of the coating area.
In some preferred embodiments of the present invention, the coating pad 10 further includes a second protrusion 40, and the second protrusion 40 is disposed at both sides of the flow channel 12.
As shown in fig. 5 and 8, the second protrusions 40 are respectively provided on both sides of the opening 11, and the provision of the chamfer 24 is omitted. The second protrusion 40 is used for regulating and controlling the coating weight at the edge of the coating area, so as to avoid the phenomenon of thick edge at the coating area and improve the consistency of the coating weight at the edge of the coating area.
Further, the distance between the second projection 40 and the opening 11 satisfies a preset value. If the distance between the second protrusion 40 and the opening 11 is too close, the thickness of the edge of the coating film area is easily too thin; if the distance between the second protrusion 40 and the opening 11 is too far, i.e. the second protrusion 40 is too close to the bottom of the flow channel 12, the thinning effect of the second protrusion 40 on the edge of the coating film area is too poor, and the edge-thickening phenomenon is easily generated. In order to better satisfy the edge of the coating film region with the desired coating thickness, it is preferable that the preset value H of the distance between the second projection 40 and the opening 11 is 3-5 cm, as shown in FIG. 6.
The embodiment of the present invention provides a size and thickness of the first and second protruding portions 30 and 40 can be adjusted according to actual use effect, and preferably, the thickness of the first and second protruding portions 30 and 40 does not exceed the thickness of the gasket main body 20.
In some embodiments of the present invention, the gasket main body 20 includes a base 21, a shunt portion 23 and side seats 22, the two ends of the base 21 are respectively provided with the side seats 22, and at least one shunt portion 23 is arranged between the two side seats 22; the flow passage 12 is formed between the branch portion 23 and the side seat 22, and between the adjacent two branch portions 23.
As shown in fig. 4, 5 and 8, the base 21 and the side seat 22 define a coating area, and a sheet-shaped flow dividing portion 23 is provided on the base 21 and further divides the coating area into a plurality of flow paths 12, a plurality of which means two or more.
The first projection 30 is provided on the base 21. When the coating pad 10 is further provided with the second projecting portion 40, the second projecting portion 40 is provided on the flow dividing portion 23 and the side seat 22.
Specifically, as shown in fig. 4 and 5, the base 21 and the side seats 22 may be in the form of a straight sheet structure, respectively, and the base 21 and the side seats 22 are combined to form a U-shaped coating region. Alternatively, in order to adjust the size of the opening 11, the same extrusion coating apparatus may be provided with coating pads 10 having different widths of the opening 11 of the flow channel 12, thereby realizing coating of pole pieces of different specifications. As shown in fig. 8, the side seat 22 is designed in the following structure: the side seat 22 includes a first blade 25 connected to the base 21 and a second blade 26 bent from a free end of the first blade 25 toward the shunt portion 23, and the size of the opening 11 can be adjusted by adjusting the length of the second blade 26. At this time, the second projection 40 is disposed on the second blade 26.
The flow dividing portion 23, the side seat 22 and the base 21 may be formed as separate bodies, for example, the base 21 may be formed of a metal sheet having an equal thickness, and the flow dividing portion 23 and the side seat 22 may be formed of a metal sheet. The shunt portion 23 and the base 21, and the side seat 22 and the base 21 can be connected together by welding. Alternatively, the flow dividing portion 23, the side seat 22 and the base 21 may be formed by integral molding, the opening 20 may be formed by milling, drilling or the like, and preferably, the coating gasket 10 may be formed by integral molding of the flow channel 12 and the opening 11.
In order to further improve the uniformity of the coating weight at the edge of the coating film area, the vertical distance between the second protruding part 40 and the corresponding side seat 22 or the flow dividing part 23 is equal at each position of the side face 41 of the second protruding part close to the center of the flow channel 12 along the extending direction of the flow channel 12. That is, the side faces 41 are equally spaced from the flow dividing portion 23 at respective positions in the direction of the single arrow in fig. 6, for example, L1 and L2 are equal. Preferably, as shown in fig. 5 and 8, the second protrusion 40 is a rectangular block having the same width. As can be seen from comparing FIG. 7 and FIG. 3, the coating weight at the edge of the coating film area is more uniform in the embodiment of the present invention.
The embodiment of the second aspect of the present invention further provides an extrusion die, wherein the extrusion die 60 includes an upper die 61, a lower die 62 and any one of the coating gaskets 10, and the coating gasket 10 is disposed between the upper die 61 and the lower die 62.
Without limitation, as shown in fig. 8 and 9, mounting holes 50 are provided on the base 21 and the side seats 22 to secure the coating shim 10 to the lower die 62.
The embodiment of the second aspect of the embodiment of the present invention further provides a coating apparatus, which includes a back roll 70 and any one of the extrusion die heads 60, a space is provided between the back roll 70 and the extrusion die head 60, and the opening 11 is disposed opposite to the back roll 70.
As shown in fig. 10, pole piece 80 is transported by backing roll 70 and is positioned in the space between extrusion die 60 and backing roll 70. The slurry can be transferred to the pole piece 80 after flowing out of the opening 11, thereby forming a coating region on the pole piece 80.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict. Products include, but are not limited to, coating shim 10, extrusion die 60, and coating apparatus.
Other configurations and operations of coating shim 10, extrusion die 60, and coating apparatus according to embodiments of the present invention are understood and readily implemented by those skilled in the art, and therefore will not be described in detail.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. The coating gasket is characterized by comprising a gasket main body and a first protruding part, wherein the gasket main body is provided with a flow channel with one open end; the first protruding part is arranged at the other end, far away from the opening, of the flow channel, and is distributed according to a preset rule according to the flow rate of the slurry at the corresponding position in the flow channel along the direction of the width of the flow channel.
2. The coated gasket of claim 1 wherein said predetermined pattern includes a projection along a direction of extension of said flow channel, said first protrusion being centrally located in said flow channel opening.
3. The coated gasket of claim 1 or 2, wherein the predetermined rule further comprises that the protruding height of the first protrusion is proportional to the flow rate of the slurry at the corresponding position in the flow channel.
4. The coating shim of claim 1, wherein the first protrusion is wedge-shaped, arch-shaped, cylindrical, rectangular parallelepiped-shaped, or square-shaped.
5. The coated gasket of claim 1 further comprising second projections disposed on both sides of the flow channel.
6. The coated gasket of claim 5 wherein the distance between the second protrusion and the opening satisfies a predetermined value.
7. The coated gasket of claim 5 or 6 wherein the coated gasket body comprises a base, a shunt part and side seats, the side seats are respectively arranged at two ends of the base, and at least one shunt part is arranged between the two side seats;
the flow passages are formed between the flow dividing parts and the side seats and between two adjacent flow dividing parts;
the first protruding portion is arranged on the base, and the second protruding portion is arranged on the flow dividing portion and the side seat.
8. The coated gasket of claim 7 wherein the second protrusion is spaced apart from the corresponding side seat or the flow dividing portion at a position on the side surface of the second protrusion near the center of the flow channel in the extending direction of the flow channel.
9. An extrusion die comprising an upper die, a lower die, and the coating shim of any one of claims 1 to 8 disposed between the upper die and the lower die.
10. A coating apparatus comprising a backing roll and the extrusion die of claim 9, said backing roll being spaced from said extrusion die and said opening being disposed opposite said backing roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922128618.7U CN211303649U (en) | 2019-11-29 | 2019-11-29 | Coating gasket, extrusion die head comprising coating gasket and coating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922128618.7U CN211303649U (en) | 2019-11-29 | 2019-11-29 | Coating gasket, extrusion die head comprising coating gasket and coating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211303649U true CN211303649U (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922128618.7U Expired - Fee Related CN211303649U (en) | 2019-11-29 | 2019-11-29 | Coating gasket, extrusion die head comprising coating gasket and coating device |
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| CN (1) | CN211303649U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192346A (en) * | 2021-11-10 | 2022-03-18 | 湖北亿纬动力有限公司 | Coating gasket and coating die head |
-
2019
- 2019-11-29 CN CN201922128618.7U patent/CN211303649U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192346A (en) * | 2021-11-10 | 2022-03-18 | 湖北亿纬动力有限公司 | Coating gasket and coating die head |
| CN114192346B (en) * | 2021-11-10 | 2023-10-31 | 湖北亿纬动力有限公司 | Coating gasket and coating die head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200821 Termination date: 20211129 |