CN221157463U - Gasket and coating machine - Google Patents

Abstract

The utility model discloses a gasket and a coating machine. Wherein the gasket includes: a gasket body; the plurality of flow dividing parts are connected to the gasket body at intervals along the first direction, and a liquid injection groove with an opening is defined between two adjacent flow dividing parts so that the slurry flows out along the second direction; the liquid injection groove is characterized in that a first groove wall close to one side of the gasket body is further provided with a flow guide part, the flow guide part is arranged at the middle position of the first groove wall in the first direction, the width of the flow guide part in the first direction is gradually reduced along the second direction, and at least one of two opposite second groove walls of the liquid injection groove in the first direction is further provided with a flow guide surface, so that at least part of the second groove walls are gradually close to the middle line of the liquid injection groove in the first direction along the second direction, and the flow speed of slurry is increased. The gasket can ensure the consistency of each position during coating so as to improve the yield of the pole piece.

Description

Gasket and coating machine

Technical Field

The utility model relates to the technical field of new energy, in particular to a gasket and a coating machine.

Background

Along with the rapid development of technology, the application of the lithium ion battery is more and more extensive, the lithium ion battery has larger advantages and development space in the aspects of energy conservation, service life, environmental adaptability, safety and cost, the industrial manufacturing process flow of the battery cell is also mature, the pole piece coating is an extremely important process during the preparation of the lithium ion battery, the quality of the pole piece coating process influences the consistency, the cycle life, the safety and the like of the battery cell, the extrusion type coating is commonly used for the pole piece coating of the lithium ion battery at present, the extrusion type coating process is a process of extruding evenly stirred slurry along the outlet gap of a coating die head, uniformly coating the slurry on a current collector and drying a solvent in the slurry, and the coating speed of the coating equipment is high and the efficiency is high.

Specifically, the slurry is gradually dispersed to two sides after entering the die cavity through the feeding hole, and the slurry is homogenized at the outlet of the slit through the buffer function of the cavity and the damping function of the slit channel, but the slurry is smaller at the two ends of the die cavity due to the larger speed of the slurry at the junction of the feeding hole and the die cavity, so that the slurry is not high in speed consistency at the outlet of the slit, the consistency of the coating surface density is poor, the slurry at the middle position is more, and the slurry at the two sides is less.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the gasket provided by the utility model can improve the consistency of slurry outflow at each position in the coating process, so that the yield of the pole piece is ensured.

The utility model also provides a coating machine applying the gasket.

A gasket according to an embodiment of the first aspect of the present utility model includes:

a gasket body;

A plurality of flow dividing parts, wherein each flow dividing part is connected to the gasket body at intervals along a first direction, and a liquid injection groove with an opening is defined between two adjacent flow dividing parts so that the slurry flows out along a second direction;

The liquid injection groove is characterized in that a first groove wall close to one side of the gasket body is further provided with a flow guide part, the flow guide part is arranged at the middle position of the first groove wall in the first direction, the width of the flow guide part in the first direction is gradually reduced along the second direction, and at least one of two opposite second groove walls of the liquid injection groove in the first direction is further provided with a flow guide surface, so that at least part of the second groove walls are gradually close to the central line of the liquid injection groove in the first direction along the second direction.

The gasket provided by the embodiment of the utility model has at least the following beneficial effects:

The gasket sets up in the coating die head, through the coating slurry on the liquid injection groove to the pole piece, all have the water conservancy diversion portion of setting on first cell wall in each liquid storage groove to and the water conservancy diversion face of setting on the second cell wall, the intermediate position of water conservancy diversion portion setting on first cell wall is equipped with the water conservancy diversion face on the second cell wall of both sides in order to slow down the velocity of flow of intermediate position when the liquid injection groove flows out the thick liquids, can accelerate the velocity that both sides thick liquids flow out, when guaranteeing to the pole piece coating slurry, the velocity that each position thick liquids flow out can be unanimous, thereby guarantees the yields of pole piece.

In other embodiments of the present utility model, the second groove wall further has a first section, the first section is connected to an end of the flow guiding surface relatively far from the gasket body, and the first section is disposed parallel to a center line of the liquid injection groove in the first direction, or, in the second direction, the flow guiding surface extends to an end of the second groove wall far from the gasket body.

In other embodiments of the present utility model, the second groove wall further has a second section, two ends of the second section are respectively connected to the gasket body and the flow guiding surface, and the second section is disposed parallel to a center line of the liquid injection groove in the first direction.

In other embodiments of the present utility model, the two opposite second groove walls are each provided with the flow guiding surface, and the flow guiding surfaces on two sides are symmetrical along a center line of the liquid injection groove in the first direction.

In other embodiments of the present utility model, a length of a projection of the flow guiding surface in the first direction is defined as L1, and a length of a projection of the flow guiding surface in the second direction is defined as L2, wherein 1/12 < L1/L2 < 3/2.

In other embodiments of the present utility model, a projection plane perpendicular to the thickness direction of the gasket is defined, and a projection of the flow guiding portion on the projection plane is an axisymmetric pattern, and a symmetry axis is a central line of the liquid injection groove in the first direction.

In other embodiments of the present utility model, the flow guiding portion is triangular.

In other embodiments of the present utility model, a length of a projection of the flow guiding portion in the first direction is defined as L3, and a length of a projection of the flow guiding portion in the second direction is defined as L4, wherein 3/4 < L3/L4 < 5/2.

The coater according to the embodiment of the second aspect of the present utility model includes:

The gasket described above;

a coating die comprising a first die body and a second die body;

The first die body and the second die body are clamped to define an inner cavity for storing the slurry, the gasket is arranged between the first die body and the second die body, and the liquid injection groove is communicated with the inner cavity.

In other embodiments of the present utility model, at least a part of the flow dividing portions further have a circulation groove, which defines a flow dividing portion located at two ends in the first direction as a first flow dividing portion, and each of the flow dividing portions located between two of the first flow dividing portions as a second flow dividing portion, where the circulation groove on the first flow dividing portion can communicate the liquid injection groove with the inner cavity, and the circulation groove on the second flow dividing portion can communicate two adjacent liquid injection grooves.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a front view of a gasket in an embodiment of an aspect of the present utility model;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

fig. 3 is an enlarged schematic view at B in fig. 1.

Reference numerals:

a gasket body 100;

A split flow portion 200 and a circulation tank 210;

The liquid injection groove 300, the first groove wall 310, the guide part 311, the second groove wall 320, the first section 321, the second section 322 and the guide surface 323.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The utility model provides a gasket and a coating machine, wherein the gasket is suitable for being arranged on a coating die head of the coating machine to coat a pole piece, slurry flows out from a liquid injection groove in the coating process, a liquid guide part reduces the slurry flow rate at the middle position, and a flow guide surface increases the flow rate at two sides so as to ensure the consistency of the slurry flow out at each position, ensure the thickness of the coated coating to be more uniform and ensure the yield of the pole piece. In order to achieve the above object, the gasket according to the present utility model includes a gasket body and a plurality of flow dividing portions, a liquid injection groove from which slurry flows out is defined between the flow dividing portions, and a flow guiding portion and a flow guiding surface are provided on a groove wall of the liquid injection groove, so as to slow down a flow velocity at a middle position and increase flow velocities at both sides. Embodiments of the present utility model are specifically described below with reference to the accompanying drawings.

Referring to fig. 1 to 3, the gasket according to the present utility model includes a gasket body 100 and a plurality of diverting portions 200, the plurality of diverting portions 200 being disposed at intervals on one side of the gasket body 100 along a first direction as shown in the drawings, and a liquid injection groove 300 being defined between two adjacent diverting portions 200 for allowing slurry to flow out along a second direction as shown in the drawings. The pole piece coating process generally uses a coater, the coating die head of which clamps the gasket along the thickness direction of the gasket, and then the slurry is extruded from the liquid injection groove 300 by pressurization to be coated on the pole piece. In this process, the slurry is located in the inner cavity of the coating die, the liquid injection groove 300 is communicated with the inner cavity, the slurry flows out from the liquid injection groove 300 to be coated on the pole piece main body, and the pole piece can be manufactured through procedures such as drying.

For convenience of description, we define the groove wall of the liquid injection groove 300 near one side of the gasket body 100 as a first groove wall 310, on the first groove wall 310, a guiding part 311 is further provided, the guiding part 311 is provided at a middle position of the first groove wall 310 in the first direction (it should be noted that, the first groove wall 310 is arranged along the first direction, the length of the first groove wall 310 in the first direction is defined as a, the guiding part 311 is provided at a/2 of the first groove wall 310 in the first direction, and when there are a plurality of liquid injection grooves 300, one guiding part 311 is provided for each liquid injection groove 300), and the width of the guiding part 311 in the first direction is gradually reduced along the second direction, so that the outflow speed of the slurry at the middle position of the liquid injection groove 300 can be reduced in the process of flowing the slurry, and the slurry can be guided to both sides.

Meanwhile, we define two opposite groove walls in the first direction of the liquid injection groove 300 as second groove walls 320, at least one second groove wall 320 further has a flow guiding surface 323 thereon, and the flow guiding surface 323 is disposed inclined to the second direction, so that at least part of the second groove walls 320 gradually approach the centerline of the liquid injection groove 300 in the first direction along the second direction (the centerline of the liquid injection groove 300 is shown by a dotted line in the drawings, hereinafter referred to as a "centerline"), and it should be noted that, during the slurry coating process, the flow guiding surface 323 is inclined toward the centerline, and the flow velocity of the slurry passing through the flow guiding surface 323 increases due to the arrangement of the flow guiding surface 323, that is, the slurry flowing out from both sides of the liquid injection groove 300 increases.

It can be understood that the flow guiding part 311 is arranged to slow down the flow velocity of the slurry at the middle position of the liquid injection groove 300, and the flow velocity of the slurry at two sides is increased by the flow guiding surface 323, so that the slurry outflow velocity at each position of the liquid injection groove 300 is consistent, the condition of uneven slurry coating is avoided, the consistency of slurry coating at each position is ensured, and the yield of the pole piece is improved.

In some embodiments, the second groove wall 320 further has a first section 321, the first section 321 being connected to an end of the flow guiding surface 323 that is relatively far from the gasket body 100, and extending to an end of the second groove wall 320 in the second direction. It can be understood that, the setting of guide surface 323 can accelerate the velocity of thick liquids outflow, one end that keeps away from gasket main part 100 at guide surface 323 sets up first section 321, first section 321 is on a parallel with the central line setting, when thick liquids flow out the in-process, when passing through second cell wall 320, accelerate through guide surface 323 earlier, then flow out through first section 321, first section 321 is parallel with the central line setting, can not influence to the velocity of flow, so that thick liquids can stable flow out, the setting of cooperation guide part 311 can further ensure the uniformity that each position thick liquids flowed out.

It should be noted that, in other embodiments, the guiding surface 323 is disposed inclined to the center line along the second direction, and extends directly to the end of the second groove wall 320 away from the gasket body 100, that is, the slurry passing through the guiding surface 323 will be accelerated by the guiding surface 323, and when the slurry at the second groove wall 320 flows out from the second direction, the slurry will be accelerated from contacting the guiding surface 323 until flowing out from the liquid injection groove 300, so as to ensure that the accelerating distance is long, further increase the speed of the slurry flowing out from two sides, and ensure consistency of the slurry flowing out from two sides and other positions.

In some embodiments, the second groove wall 320 further has a second section 322, the second section 322 is parallel to the central line of the liquid injection groove 300, and two ends of the second section 322 are respectively connected to the flow guiding surface 323 and the gasket main body 100, that is, when slurry coating is performed, slurry on two sides flows smoothly through the second section 322, and then flows through the flow guiding surface 323 to achieve accelerated outflow, so that the outflow speed of the slurry on two sides is consistent with that of other positions, consistency of each position during coating is ensured, and the thickness of the slurry on the pole piece is kept consistent.

It should be noted that, in some embodiments, the second groove wall 320 includes, along the second direction, a second section 322, a guiding surface 323, and a first section 321, and the slurry flows from the second section 322 to the guiding surface 323 along the second direction, and flows smoothly from the first section 321 after being accelerated by the guiding surface 323. In other embodiments, the second groove wall 320 includes only the second section 322 and the guide surface 323, and the slurry flows from the second section 322 to the guide surface 323 in the second direction, and directly flows out through acceleration of the guide surface 323.

In some embodiments, the liquid injection groove 300 has the diversion surface 323 on each of the two opposite second groove walls 320 in the first direction, and the diversion surfaces 323 on both sides are symmetrically disposed along the center line of the liquid injection groove 300. The second groove walls 320 on both sides are symmetrically arranged along the center line of the liquid injection groove 300, and when the diversion surfaces 323 are arranged, the diversion surfaces 323 on the second groove walls 320 on both sides are symmetrically arranged, so that the inclination and the length of the diversion surfaces 323 on both sides for the slurry can be ensured to be the same, and when the slurry is diverted, the acceleration effect of the diversion surfaces 323 on both sides is uniform, namely, the outflow speeds of the slurry on both sides are uniform, thereby further ensuring the consistency of the slurry outflow at each position when the coating is performed.

In some embodiments, for convenience of description, we define a projection plane perpendicular to the thickness direction of the gasket, and make a projection of the second groove wall 320 on this projection plane, where the length of the projection in the first direction of the guide plane 323 is defined as L1, and the length of the projection in the second direction is defined as L2, so as to ensure that the guide plane 323 can achieve the acceleration effect on the slurry flowing out to achieve the requirement that 1/12 < L1/L2 < 3/2.

Specifically, in some embodiments, in practical application, the length of the spacer is adjusted according to the actual situation to adapt to multiple coatings simultaneously, but according to the specification of the pole piece, the length of one liquid injection groove 300 in the first direction is generally 300mm to 400mm, and it can be understood that the flow guiding surface 323 is obliquely arranged to accelerate the flow of the slurry, so that the speed of the slurry flowing out from two sides of one liquid injection groove 300 is increased, and the consistency of each position is ensured. The increase in the slurry flow rate is generally determined by the inclination of the guide surface, i.e. 1/12 < L1/L2 < 3/2, i.e. the inclination of the guide surface is within this interval.

And in order to ensure the strength of the gasket and facilitate the processing and production, in practical application, the length of L1 is generally 5mm to 30mm, and the length of L2 is generally 20mm to 60mm.

In some preferred embodiments, L1 is 6mm in length and L2 is 20mm in length.

In some embodiments, for convenience of description, we define a projection plane perpendicular to the thickness direction of the spacer, the projection of the diversion portion 311 on this projection plane is an axisymmetric pattern, and the symmetry axis is a center line of the liquid injection groove 300 in the first direction. It can be understood that the arrangement of the guiding portion 311 is to reduce the outflow speed of the slurry in the middle position of the liquid injection groove 300 in the coating process, and the width of the guiding portion 311 in the first direction is gradually reduced along the second direction, so that the slurry can be guided to two sides, the slurry can be guided to two sides while the flow speed in the middle position is reduced, the consistency of the slurry outflow in each position is ensured, and the thickness consistency of the slurry on the pole piece is ensured. The diversion part 311 is arranged in an axisymmetric pattern and is symmetric along the central line of the liquid injection groove 300, so that slurry can be evenly diverted to two sides during diversion, the flow velocity of the slurry at two sides is ensured to be more even, the coating consistency is further ensured, and the yield of the pole piece is further improved.

In some embodiments, referring to fig. 1 and 2, the shape of the projection of the diversion portion 311 on the projection plane is triangular, and is symmetrical along the center line of the liquid injection groove 300, that is, the projection of the diversion portion 311 is isosceles triangle, so as to ensure that the slurry is evenly diverted to two sides while the flow rate of the middle position of the liquid injection groove 300 is reduced, and ensure the consistency of coating. And the design of the triangular guide part 311 is simpler in production and processing, and the cost of gasket production and processing can be further reduced.

In some embodiments, the projection of the guide portion 311 on the projection plane perpendicular to the thickness direction of the gasket is an axisymmetric pattern, and for convenience of description, we define the length of the projection of the guide portion 311 in the first direction to be L3, and the length of the projection in the second direction to be L4, wherein 3/4 < L3/L4 < 5/2.

Specifically, the shape of the guide portion 311 is controlled by L3 and L4, and in practical production applications, the length of the spacer is adjusted according to practical situations to accommodate simultaneous multiple coating, but according to the specifications of the pole piece, the length of one liquid injection groove 300 in the first direction is typically 300mm to 400mm, and the length of the liquid injection groove 300 in the second direction is typically 80mm to 100mm. The guide part 311 is disposed at the middle position of the first groove wall 310, and the guide part 311 is in an axisymmetric pattern symmetric along the center line, the width in the first direction gradually decreases along the second direction, the flow velocity of the slurry at the middle position of the liquid injection groove 300 can be reduced by using the convex shape of the guide part 311 along the second direction, and the slurry can be guided to two sides, so that the consistency of each position is realized, and the normal coating is ensured.

In practical applications, the length of the diversion portion 311 in the first direction is generally 30mm to 50mm, and the width in the second direction is 20mm to 40mm, so as to ensure diversion of the slurry.

Specifically, in some preferred embodiments, the shape of the flow guide 311 is a triangle symmetrical along the midline, and l3=40 mm, l4=30 mm.

According to a second aspect of the present utility model, there is disclosed a coater comprising: the gasket and the coating die head comprise a first die body and a second die body, wherein the first die body and the second die body can be clamped and are limited with an inner cavity after being clamped, the gasket is arranged between the first die body and the second die body, the inner cavity is communicated with the liquid injection groove 300 after the first die body and the second die body are clamped, and when coating is carried out, slurry flows to the pole piece from the inner cavity through the liquid injection groove 300 and is coated on a corresponding area on the pole piece, so that the coating of the pole piece is realized.

It can be understood that, during the coating process, the flow guiding portion 311 on the first groove wall 310 and the flow guiding surfaces 323 on both sides act together to reduce the flow velocity of the slurry in the middle position of the liquid injection groove 300, and to increase the flow velocity on both sides, so as to ensure the consistency of the slurry flowing out of each position, thereby ensuring that the thickness is consistent when the slurry is coated on the pole piece, and ensuring the yield of the pole piece.

In some embodiments, the diversion portion 200 further has a circulation groove 210 thereon, specifically, for convenience of description, referring to fig. 1, we define the diversion portion 200 located at both ends in the first direction as a first diversion portion 200, and between the two first diversion portions 200 as a second diversion portion 200, wherein the circulation groove 210 on the first diversion portion 200 communicates with the liquid injection groove 300 and the inner cavity to prevent the slurry from settling in the liquid injection groove 300, and the circulation groove 210 also has the circulation groove 210 on the second diversion portion 200 to communicate with the two adjacent liquid injection grooves 300 to balance the pressure between the respective liquid injection grooves 300 while preventing the slurry from settling, so as to further ensure consistency of the slurry flowing out of the respective liquid injection grooves 300.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. Gasket, install on the coating die head of coating machine for carry out thick liquids coating to the pole piece, its characterized in that includes:

a gasket body;

A plurality of flow dividing parts, wherein each flow dividing part is connected to the gasket body at intervals along a first direction, and a liquid injection groove with an opening is defined between two adjacent flow dividing parts so that the slurry flows out along a second direction;

The liquid injection groove is characterized in that a first groove wall close to one side of the gasket body is further provided with a flow guide part, the flow guide part is arranged at the middle position of the first groove wall in the first direction, the width of the flow guide part in the first direction is gradually reduced along the second direction, and at least one of two opposite second groove walls of the liquid injection groove in the first direction is further provided with a flow guide surface, so that at least part of the second groove walls are gradually close to the central line of the liquid injection groove in the first direction along the second direction.

2. The gasket of claim 1 wherein the second groove wall further has a first segment connected to an end of the guide surface opposite the gasket body and disposed parallel to a centerline of the liquid injection groove in the first direction or, in the second direction, the guide surface extends to an end of the second groove wall opposite the gasket body.

3. The gasket of claim 2 wherein the second groove wall further has a second section, two ends of the second section are connected to the gasket body and the flow guiding surface, respectively, and the second section is disposed parallel to a centerline of the liquid injection groove in the first direction.

4. A gasket according to claim 1, wherein the two opposing second groove walls are each provided with said flow guiding surface, and wherein the flow guiding surfaces on both sides are symmetrical along a center line of the liquid injection groove in the first direction.

5. The gasket of claim 1 wherein the length of the projection of the flow directing surface in the first direction is defined as L1 and the length of the projection in the second direction is defined as L2, wherein 1/12 < L1/L2 < 3/2.

6. A gasket according to claim 1, wherein a projection plane perpendicular to the thickness direction of the gasket is defined, the projection of the flow guide portion on the projection plane being an axisymmetric pattern, the symmetry axis being a center line of the liquid injection groove in the first direction.

7. The gasket of claim 6 wherein the flow directors are triangular.

8. The gasket of claim 6 wherein the length of the projection of the deflector in the first direction is defined as L3 and the length of the projection in the second direction is defined as L4, wherein 3/4 < L3/L4 < 5/2.

9. Coating machine, characterized by, include:

The gasket of any one of claims 1 to 8;

a coating die comprising a first die body and a second die body;

The first die body and the second die body are clamped to define an inner cavity for storing the slurry, the gasket is arranged between the first die body and the second die body, and the liquid injection groove is communicated with the inner cavity.

10. The coater according to claim 9, wherein at least part of the flow dividing portions further have circulation grooves defining the flow dividing portions located at both ends in the first direction as first flow dividing portions, each of the flow dividing portions located between two of the first flow dividing portions as second flow dividing portions, the circulation grooves in the first flow dividing portions being capable of communicating the liquid injection groove with the inner cavity, and the circulation grooves in the second flow dividing portions being capable of communicating two adjacent liquid injection grooves.