CN216173709U - Coating pad and coating device - Google Patents

Abstract

The application discloses coating gasket and coating unit. The coating gasket comprises a feeding port, a discharging port and a flow channel. The slurry flows into the coating gasket from the feeding port, flows through the flow channel, and finally flows out from the discharging port and is coated to form the pole piece. Be provided with the part that blocks in the runner for block the thick liquids through the runner, be formed with the region of reducing on the pole piece that coats out, the thick liquids thickness in the region of reducing is less than all the other regional thick liquids thickness, in order to guarantee at battery monomer charge-discharge in-process, the regional electrolyte that can store part that the region corresponds of reducing, guarantees the electrolyte content between the pole piece, improves the free safety of battery and life-span.

Description

Coating pad and coating device

Technical Field

The application relates to the technical field of secondary batteries, in particular to a coating gasket and a coating device.

Background

The battery cell has the advantages of high cycle number, long storage time, high power density, high energy density and the like, so that the battery cell is widely applied to the fields of electric automobiles, mobile equipment, electric energy storage and the like. In the use process of the single battery, the expansion or contraction can occur during the charge and discharge of the pole pieces, so that the electrolyte between the pole pieces can be extruded or reflowed along with the charge and discharge process of the single battery.

Due to the space limitation in the single battery shell, sometimes, the electrolyte extruded when the pole pieces expand cannot effectively flow back to the pole pieces when the pole pieces contract, so that the amount of the electrolyte between the pole pieces is insufficient, the cycle performance of the single battery is reduced, and the performance of the single battery is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides a coating pad and a coating apparatus capable of manufacturing a pole that is locally thinned.

In one aspect, the present application provides a coating shim for coating a slurry onto a substrate to form a pole piece, the pole piece being provided with a thinning region, the thickness of the slurry in the thinning region being less than the thickness of the slurry in the remaining regions of the pole piece; the coating gasket comprises a feeding port for inflow of slurry, a discharging port for outflow of the slurry and a flow channel arranged between the feeding port and the discharging port, wherein the flow channel is used for communicating the feeding port and the discharging port, and a blocking part is arranged in the flow channel and used for blocking the slurry passing through the flow channel so as to form a thinning area on a pole piece.

In the technical scheme of this application embodiment, be provided with the part of blockking in the runner of coating gasket, when thick liquids flow through the runner, the part of blockking can block thick liquids to form the region of reducing on the pole piece.

In some embodiments, the height of the blocking portion is smaller than the height of the flow channel in the thickness direction of the gasket. The height of the blocking part along the thickness direction of the coating gasket is designed to be smaller than that of the flow channel, so that slurry can be coated on the pole piece in the thinning area, and the formation of the thinning area 21 on the pole piece 20 is guaranteed.

In some embodiments, the blocking portion is disposed at an end of the flow channel close to the discharge port, and a distance between the blocking portion and the discharge port along a first direction is 0mm to 50mm, where the first direction is a flowing direction of the slurry on the flow channel.

Through setting up the distance on barrier part and the first direction of discharge gate edge and being 0mm to 50mm, can prevent that barrier part is far away from the discharge gate distance, and make by the barrier part stop and the thick liquids of attenuate converge with the thick liquids of other positions and can't form the region of reducing between barrier part and discharge gate, guaranteed the effect that blocks of barrier part to thick liquids, thereby guarantee to form the region of reducing on the pole piece, improve the free cycle life of battery.

In some embodiments, the coating pad includes a main body portion having an opening portion through which the slurry flows out; the connecting part is connected with the main body part and arranged at the opening part, and a bulge is arranged on the surface of the connecting part close to the flow passage and forms a blocking part. The blocking part is formed by arranging the protrusion on the surface of the connecting part close to the flow channel, so that the gasket is simple in structure and easy to replace and maintain.

In some embodiments, a surface of the connecting portion facing away from the blocking portion is flush with a surface of the body portion. Due to the design, no gap exists between the surface of the connecting part departing from the blocking part and the surface of the main body part in the thickness direction of the coating gasket, and the slurry can be prevented from flowing out along the surface of the connecting part departing from the blocking part to influence the thickness of the thinning area.

In some embodiments, the coating pad includes two connection portions disposed at intervals in a thickness direction of the coating pad at the opening portion, and a gap between the two connection portions forms a partial runner. By arranging the two connecting parts, the blocking parts can be respectively arranged on the two connecting parts, so that the number of the blocking parts on the connecting parts can be reduced, and the connecting parts can be processed more easily; on the other hand, only one side of the coating gasket can be prevented from being impacted by the slurry, and the coating gasket is prevented from being deformed due to uneven stress.

In some embodiments, the connecting portion is removably connected to the body portion. Set up connecting portion and main part into to dismantle the connection, when the size and/or the quantity of blocking part need to be changed, can be through dismantling connecting portion, change new connecting portion can, can improve the application scope of coating gasket, reduce manufacturing cost.

In some embodiments, the connecting portion is provided with a convex portion, and the main body portion is correspondingly provided with a concave portion, and the concave portion is used for accommodating the convex portion to form a detachable connection of the connecting portion and the main body portion. The detachable connection between the connecting portion and the main body portion is achieved through the clamping connection of the concave portion and the convex portion, and the connecting portion can be replaced and maintained conveniently.

In some embodiments, the coating pad further comprises a connecting member, the main body portion and the connecting portion are both provided with a connecting hole, and the connecting member is arranged in the connecting hole to form a detachable connection of the main body portion and the connecting portion. The detachable connection of the main body part and the connecting part is realized by arranging the connecting piece, and only connecting holes need to be formed in the main body part and the connecting part, so that the connecting part and the main body part are simple in structure and easy to machine and manufacture.

In some embodiments, the number of the blocking parts is multiple, and the multiple blocking parts are arranged in the flow passage at intervals. Through setting up a plurality of stop parts, can form a plurality of thin districts that reduce on the pole piece, can guarantee at battery monomer charge-discharge in-process, have a plurality of regions that can preserve electrolyte between the pole piece, further guarantee the volume of the electrolyte between the pole piece, guarantee the free cycle life of battery.

In another aspect, the present application provides a coating apparatus comprising an upper die, a lower die, and the coating shim of the above embodiments, the coating shim disposed between the upper die and the lower die.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

fig. 1 is a diagram illustrating an overall structure of a coating apparatus according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a coating apparatus according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of FIG. 2 taken along direction A according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a pole piece provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a coated gasket according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of FIG. 5 taken along direction B according to an embodiment of the present disclosure;

FIG. 7 is a top view taken along direction C of FIG. 5 according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a coated gasket having two connecting members according to an embodiment of the present disclosure;

FIG. 9 is an enlarged view of a portion of FIG. 8 taken along direction D provided by an embodiment of the present application;

FIG. 10 is an enlarged view of a portion of FIG. 8 taken along direction D provided by an embodiment of the present application;

FIG. 11 is an enlarged view of a portion of FIG. 8 taken along direction D provided by an embodiment of the present application;

FIG. 12 is an exploded view of a coated gasket provided in accordance with an embodiment of the present application;

FIG. 13 is an enlarged view of a portion of FIG. 12 taken along direction E provided by an embodiment of the present application;

FIG. 14 is an enlarged view of a portion of FIG. 12 taken along direction E provided by an embodiment of the present application;

fig. 15 is a schematic structural diagram of a coated gasket according to an embodiment of the present disclosure.

Description of reference numerals:

1. a coating device;

10. a convex gasket;

11. a feeding port;

12. a discharge port;

13. a flow channel;

14. a blocking portion;

15. a main body portion;

151. an opening part;

152. positioning holes;

153. a recess;

16. a connecting portion;

161. a protrusion;

162. a convex portion;

17. a connecting member;

20. pole pieces;

21. a thinning region;

22. a substrate;

23. sizing agent;

30, an upper die head;

40. a lower die head;

50. a backing roll;

x, a first direction;

y, a second direction;

z, coating the thickness direction of the gasket;

h1, barrier height;

h2, height of flow channel;

d. the distance between the blocking part and the discharge hole;

w, barrier width.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

Currently, in view of the development of market situation, the battery cell is widely used due to its advantages of long storage time, high power density, high energy density, and the like. Specifically, the battery cell is not only applied to energy storage power systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and multiple fields such as military equipment and aerospace. With the expansion of the application field of the battery cell, the market demand is also expanding continuously.

The applicant has noted that during the charging and discharging of the battery cell, ions can be embedded into or separated from the pole piece, thereby causing the pole piece to become thicker or thinner. When the pole pieces are thickened, electrolyte between the pole pieces can be extruded out due to extrusion, so that the risk of lithium precipitation and the like caused by insufficient electrolyte at the local part of the battery monomer is caused; when the pole pieces become thinner, the extruded electrolyte cannot effectively flow back to the space between the pole pieces due to the small gap between the pole pieces, so that the content of the electrolyte between the pole pieces is insufficient. On one hand, the insufficient electrolyte between the pole pieces can directly influence the capacity and the cycle life of the battery monomer; on the other hand, insufficient electrolyte between the pole pieces can cause ion crystallization, and the risk of causing fire and affecting the safety of the single battery due to the fact that the diaphragm between the pole pieces is punctured to cause short circuit inside the single battery is existed.

In order to solve the problem of insufficient electrolyte between single pole pieces of the battery, the applicant researches and discovers that some spaces capable of storing the electrolyte can be coated on the pole pieces during coating so as to ensure that enough electrolyte is always stored between the pole pieces, increase the infiltration efficiency of the pole pieces and ensure the service life and safety of the single battery.

Based on the above consideration, in order to solve the problem of insufficient electrolyte between the battery cell pole pieces, the applicant has conducted intensive research and has designed a coating pad and a coating apparatus, in which at least one blocking portion is disposed on the coating pad, and the blocking portion blocks the slurry to form a thinning region on the pole piece. Because the thickness of the slurry in the thinning area on the pole piece is smaller than that of the slurry in the rest areas of the pole piece, in the charging and discharging process of the single battery, the thinning area can store part of electrolyte, the electrolyte between the pole pieces can be prevented from being completely extruded, and the cycle life and the safety of the single battery can be further improved.

Referring to fig. 1 and 2, in one aspect, the present disclosure provides a coating apparatus 1, which includes an upper die 30, a lower die 40, and a coating shim 10, where the coating shim 10 is disposed between the upper die 30 and the lower die 40.

As shown in fig. 1, the slurry 23 flows out of the coating apparatus 1 and is coated on the substrate 22 to form the pole piece 20. Specifically, the components of the slurry 23 include, but are not limited to, graphite, binder, lithium ions, sodium ions, etc., and the substrate 22 includes, but is not limited to, copper foil, aluminum foil, etc.

Optionally, as shown in fig. 1, the side of the pole piece 20 facing away from the coating device 1 is provided with a backing roll 50 for supporting the substrate 22 during coating. The material of the backing roller 50 includes, but is not limited to, stainless steel, cast iron, and the like. Alternatively, backing roll 50 may be hollow to reduce the mass of backing roll 50, which may facilitate removal and replacement of backing roll 50, on the one hand, and reduce the inertial force of the backing roll, on the other hand, making backing roll 50 easier to control. Optionally, the surface of backing roll 50 may be treated to enhance the wear resistance of backing roll 50 and extend the useful life of backing roll 50. The backing roll 50 is arranged on the side of the pole piece 20 facing away from the coating device 1, and can support the base material 22 in the coating process, so that the distance between the base material 22 and the coating device 1 is kept constant, and the consistency of the slurry 23 coated on the base material 22 can be ensured.

As shown in fig. 2, the coating apparatus 1 includes an upper die 30, a lower die 40, and a coating shim 10, the coating shim 10 is disposed between the upper die 30 and the lower die 40 such that a flow passage 13 is formed between the upper die 30 and the lower die 40, and the slurry 23 can flow out of the coating apparatus 1 through the flow passage 13, thereby coating on the substrate 22 to form the pole piece 20. The upper die head 30 and the lower die head 40 may be a square structure or a cylindrical structure, which is not limited in this embodiment of the present invention, and it should be noted that the upper die head 30 and the lower die head 40 may be the same shape or different shapes, but planes of the upper die head 30 and the lower die head 40 contacting with the coating gasket 10 are required to be attached to each other, so as to ensure that the coating device 1 has good sealing performance. The upper die 30 and the lower die 40 are made of metal materials such as cast iron and aluminum, and may also be made of non-metal materials such as plastic and polyester fiber, which are not limited in the embodiments of the present application.

Referring to fig. 2 to 6, another aspect of the embodiment of the present application provides a coating pad 10 for coating a slurry 23 onto a substrate 22 to form a pole piece 20, wherein the pole piece 20 is provided with a thinning area 21, and the thickness of the slurry in the thinning area 21 is smaller than that of the slurry in the rest area of the pole piece 20; the coating gasket 10 comprises a feeding port 11 for inflow of slurry 23, a discharging port 12 for outflow of the slurry 23, and a flow channel 13 arranged between the feeding port 11 and the discharging port 12, wherein the flow channel 13 is used for communicating the feeding port 11 with the discharging port 12, and a blocking part 14 is arranged in the flow channel 13 and used for blocking the slurry passing through the flow channel 13 so as to form a thinning area 21 on a pole piece 20.

As shown in fig. 4, the pole piece 20 is provided with a thinning area 21, and the thickness of the slurry on the thinning area 21 is smaller than that of the slurry on the rest area of the pole piece 20. The pole piece 20 includes a positive pole piece and a negative pole piece, and the thinning area 21 may be disposed on the positive pole piece, the negative pole piece, or both the positive pole piece and the negative pole piece, which is not limited in this application.

The thinning-out region 21 is provided on the positive electrode sheet and/or the negative electrode sheet, and when the positive electrode sheet, the negative electrode sheet, and the insulating film are wound or stacked on each other to form a battery cell, an accommodating space for accommodating an electrolyte may be formed on a region corresponding to the thinning-out region 21. In the process of charging and discharging of the single battery, when the pole pieces 20 become thick or thin and are extruded, the thinning area 21 can still contain partial electrolyte, so that the electrolyte between the pole pieces 20 is prevented from being completely extruded, and the cycle life and safety of the single battery are further improved.

As shown in fig. 5, the coating pad 10 includes a feeding port 11, a discharging port 12, and a flow channel 13. The feeding port 11 is communicated with the lower die head 40, after the slurry 23 enters the lower die head 40 through the conveying mechanism, the slurry enters the coating gasket 10 through the feeding port 11, and the feeding port 11 can be in a regular shape such as a square shape and a circular shape, and can also be in an irregular figure formed by multi-end straight lines and/or arcs, which is not limited in the embodiment of the application. The discharge port 12 is communicated with the outside of the coating device 1, and the slurry 23 flows out of the coating device 1 through the discharge port 12 and is coated on the substrate 22 to form the pole piece 20. The flow channel 13 is used for communicating the feeding port 11 and the discharging port 13, generally, the height of the flow channel 13 in the thickness direction Z of the coating pad 10 is small, so that the slurry 23 in the coating device 1 has sufficient pressure, the slurry 23 is extruded and flows to the discharging port 13 through the flow channel 13, the uniformity of the flowing slurry 23 can be ensured, and the consistency of the thickness of the slurry on the pole piece 20 can be ensured.

In some embodiments, a blocking portion 14 is disposed within flow channel 13 for blocking slurry passing through flow channel 13 to form a thinned region 21 on pole piece 20.

Alternatively, as shown in fig. 2 and 3, the blocking portion 14 may be provided on a region corresponding to the flow path 13 in the upper die 30 and/or the lower die 40. Specifically, the blocking portion 14 may be formed by a protrusion on the upper die 30 and/or the lower die 40, and the blocking portion 14 and the upper die 30 or the lower die 40 may be integrally formed, or may be combined together by welding, bonding, and the like after being manufactured respectively; of course, the blocking portion 14 and the upper die 30 or the lower die 40 may be combined together by a detachable connection manner, so that the blocking portion 14 is convenient to replace when worn and needs to be replaced, and the pole piece 20 with the thinned area 21 having different shapes or sizes can be coated by replacing the shape, size and the like of the blocking portion 14, thereby improving the applicability of the coating manufacture 1. Since the size of the coating pad 10 in the thickness direction Z is small, the extrusion deformation is liable to occur, and providing the barrier section 14 in the upper die 30 and/or the lower die 40 can transfer the impact force of the paste 23 against the barrier section 14 to the upper die 30 and/or the lower die 40, reducing the possibility of the coating pad 10 deforming.

Of course, in some embodiments, as shown in fig. 5 or 6, the barrier 14 may also be disposed on the applicator pad 10. On one hand, the provision of the barrier section 14 on the coating pad 10 facilitates removal and replacement of the barrier section 14, since the upper die 30 and the lower die 40 are bulky and heavy, which is not easy to remove and handle; on the other hand, when the barrier portion 14 is disposed on the coating pad 10, the pole piece without the thinning area 21 can be coated only by replacing the coating pad 10 with a common pad, so that the application range of the coating apparatus 1 can be further increased, and the production cost can be reduced.

By providing the blocking portion 14 in the flow channel 13 of the coated gasket 10, the blocking portion 14 blocks the slurry 23 when the slurry 23 flows through the flow channel 13 to form the thinned area 21 on the pole piece 20. The thickness of the slurry in the thinning area 21 is smaller than that of the slurry in the rest areas, and in the charging and discharging process of the single battery, the pressure applied to the pole piece 20 in the thinning area 21 when expanding is reduced, so that the electrolyte in the area cannot be extruded out, the amount of the electrolyte between the pole pieces 20 is ensured, and the cycle life and the safety of the single battery can be improved.

Referring to fig. 3 or 6, in some embodiments, the height h1 of the blocking portion 14 is less than the height h2 of the flow channel 13 in the gasket thickness direction Z.

By designing the height h1 of the barrier 14 in the direction of thickness Z of the coated gasket to be less than the height h2 of the flow channel 13, it is ensured that the corresponding substrate 22 of the thinned zone 21 is coated with the paste 23 to ensure the formation of the thinned zone 21 on the pole piece 20.

Referring to fig. 7, in some embodiments, the blocking portion 14 is disposed at an end of the flow channel 13 close to the discharge port 12, and a distance d between the blocking portion 14 and the discharge port 12 along a first direction X is 0mm to 50mm, where the first direction X is a flowing direction of the slurry 23 on the flow channel 13.

As shown in fig. 7, the distance d refers to the shortest distance between the blocking portion 14 and the discharge hole 12 in the first direction X. The blocking portion 14 can block the slurry 23 flowing through the flow channel 13, so that the area can pass a smaller amount of the slurry 23, and further, the slurry 23 on the thinning area 21 of the pole piece 20 corresponding to the blocking portion 14 is smaller, and the thickness of the slurry on the thinning area 21 is smaller than that of the slurry on the rest area. If the distance d between the barrier part 14 and the discharge hole 12 is too large, the slurry 23 separated by the barrier part 14 is caused to flow together again in the area between the barrier part 14 and the discharge hole 12, and the thinned area 21 cannot be formed on the pole piece or the depth of the thinned area 21 is small, which affects the service life and safety of the battery cell. Therefore, it is necessary to ensure that the distance d between the blocking portion 14 and the discharge hole 12 satisfies: d is more than or equal to 0mm and less than or equal to 50 mm.

It should be noted that, as the width w of the barrier portion increases, the greater the separation distance between the slurry 23 separated by the barrier portion 14, the greater the difficulty of the slurry 23 being merged together again. Therefore, the larger the width w of the barrier portion, the larger the allowable distance d between the barrier portion 14 and the discharge hole 12. The width w of the barrier means the longest distance between two opposite sides of the barrier 14 in the second direction Y. The second direction Y is perpendicular to the first direction X and perpendicular to the thickness direction Z of the coating pad.

Optionally, the range of the barrier width W is: d is more than or equal to 0.1mm and less than or equal to 5 mm. When the width of the blocking part is less than 0.1mm, the width of the corresponding thinning area 21 is smaller, and less electrolyte is stored in the charging and discharging process of the single battery, so that the cycle life and the safety of the single battery are influenced; when the width of the barrier portion is greater than 5mm, the width of the corresponding thinning region is too large, resulting in less slurry 23 applied to the surface of the base material 22, which may affect the capacity of the battery cell.

The range of the distance d between the blocking part 14 and the discharge port 12 in the first direction X is 0mm to 50mm, the blocking part 14 can be prevented from being far away from the discharge port 12, the thinned slurry 23 blocked by the blocking part 14 is converged with the slurry 23 at other positions in the area between the blocking part 14 and the discharge port 12, and a thinning area 21 cannot be formed, so that the blocking effect of the blocking part 14 on the slurry 23 is ensured, the thinning area 21 is formed on the pole piece 20, and the cycle life of a battery monomer is prolonged.

Referring to fig. 5 and 6, in some embodiments, the coating pad 10 includes a main body 15 having an opening 151 in the main body 15, and the slurry 23 flowing out through the opening 151; the connecting portion 16 is connected to the body portion 15 and disposed in the opening 151, and a protrusion 161 is disposed on a surface of the connecting portion 16 close to the flow channel 13, and the protrusion 161 forms the blocking portion 14.

As shown in fig. 5, the coating pad 10 includes a main body 15, the main body 15 has a shape including, but not limited to, a cube, a cylinder, etc., the main body 15 has a hollow structure to form a feeding port 11, and the slurry 23 in the lower die 40 is fed into the coating pad 10. Alternatively, the body 15 may be provided with an opening 151 for forming the flow path 13 and for transferring the slurry in the application pad 10 to the outside of the application pad 10. The main body 15 may be made of cast iron, stainless steel, aluminum, etc., which is not limited in this application. The main body may be manufactured by one or more manufacturing methods, such as casting, milling, cutting, etc., and the present application is not limited thereto.

In some embodiments, as shown in fig. 5, the positioning holes 152 and/or positioning pillars are disposed on the main body portion 15, and the positioning pillars and/or positioning holes are correspondingly disposed on the upper die head 30 and/or the lower die head 40, so as to fix the relative positions between the coating pad 10 and the upper die head 30 and the lower die head 40, and prevent the coating pad 10 from moving under the impact of the slurry 23 during coating, which affects the coating quality. Specifically, the shape of the positioning hole 152 includes, but is not limited to, a polygon, a circle, and the like, and the shape of the corresponding positioning post includes, but is not limited to, a prism, a cylinder, and the like.

Optionally, as shown in fig. 5 and 6, the coating pad 10 further includes a connecting portion 16, and the connecting portion 16 is connected to the main body portion 15 and disposed in the opening 151. The connecting portion 16 may be made of cast iron, stainless steel, aluminum, etc., which is not limited in this application. The main body may be manufactured by one or more manufacturing methods, such as casting, milling, cutting, etc., and the present application is not limited thereto. The connection mode between the connection part 16 and the main body part 15 can be a non-detachable connection mode such as welding, bonding, riveting and the like so as to ensure the connection strength between the connection part 16 and the main body part 15; of course, the connection between the connection portion 16 and the main body portion 15 may be a detachable connection such as a screw connection, a bolt connection, or a snap connection, so as to facilitate the detachment and replacement of the connection portion 16 and facilitate the use, replacement, maintenance, and repair of the coating gasket 10.

Alternatively, as shown in fig. 5 and 6, a protrusion 161 is provided on a surface of the connecting portion 16 close to the flow channel 13 to form the blocking portion 14. The shape of the protrusion 161 includes, but is not limited to, a cube, a cylinder, and the like. The protrusion 161 and the connecting portion 16 can be integrally formed, so that the manufacturing process of the connecting portion 16 can be reduced, and the connection strength between the protrusion 161 and the connecting portion 16 can be ensured. The protrusion 161 and the connecting portion 16 may also be assembled after being manufactured separately, and optionally, the connection between the protrusion 161 and the connecting portion 16 may be a non-detachable connection such as welding, so as to ensure the connection strength between the protrusion 161 and the connecting portion 16. Certainly, the connection mode between the protrusion 161 and the connection portion 16 may also be a detachable connection mode such as clamping, and the thinned regions 21 with different shapes and/or sizes may be coated by replacing the protrusion 161 with different shapes and/or sizes, so that the application range of the coating gasket is improved, and the manufacturing cost is reduced.

The number of projections 161 is at least one to ensure the formation of the thinned area 21 on the pole piece 20. Alternatively, as shown in fig. 5 or 6, a plurality of protrusions 161 are provided on the connecting member 16, and the plurality of protrusions 161 are provided on the connecting member 16 at intervals along the second direction Y. The plurality of protrusions 161 may be distributed at equal intervals or at unequal intervals along the second direction Y, which is not limited in the embodiment of the present application.

The blocking portion 14 is formed by providing the protrusion 161 on the surface of the connecting portion 16 close to the flow path 13, so that the gasket 10 is simple in structure and easy to replace and maintain.

Referring to fig. 6, in some embodiments, the surface of the connecting portion 16 facing away from the blocking portion 14 is flush with the surface of the body portion 15.

The flush refers to that the surface of the connecting part 16 departing from the barrier part 14 and the surface of the main body part 15 are on the same plane, so that no gap exists between the surface of the connecting part 16 departing from the barrier part 14 and the surface of the main body part 15 in the thickness direction Z of the coated gasket, and the slurry 23 can be prevented from flowing out along the surface of the connecting part 16 departing from the barrier part 14 and affecting the uniformity of the slurry 23 coated on the base material 22.

Referring to fig. 8 to 10, in some embodiments, the coating pad 10 includes two connection portions 16, the two connection portions 16 are disposed at intervals in the thickness direction Z of the coating pad in the opening portion 151, and a gap between the two connection portions 16 forms a part of the flow channel 13.

Alternatively, the two connecting portions 16 may be integrally formed and then connected to the main body portion 15, so as to facilitate the removal and replacement of the connecting portions 16. However, considering that the thickness of the coating pad 10 is small and the manufacturing difficulty is high when the two connecting portions 16 are integrally formed, the two connecting pieces 16 can be separately manufactured and then respectively connected with the main body portion 15, so that the processing difficulty of the connecting portions 16 is reduced, and the production cost is reduced.

As shown in fig. 9, the stopper 14 may be optionally provided on one of the connecting pieces 16, and the manufacturability of the coated gasket can be improved by machining the stopper 14 on one of the connecting pieces 16 during the machining process.

Alternatively, the blocking section 14 can also be provided on both connecting webs 16. Specifically, as shown in fig. 10, the stoppers 14 on the two connecting pieces 16 may be arranged at staggered intervals; as shown in fig. 11, the stoppers 14 on the two connecting pieces 16 may also be correspondingly arranged, and the sum of the heights of the two stoppers 14 in the thickness direction Z of the coated gasket 10 is smaller than the height of the flow channel, so as to ensure that a gap for passing the slurry 23 is left between the two stoppers 14, and ensure that the slurry 23 is coated on the thinning area 21 of the pole piece 20. The blocking parts 14 are respectively arranged on the two connecting parts 16, so that on one hand, the number of the blocking parts 14 on the connecting parts 16 can be reduced, and the connecting parts 16 are easier to process; on the other hand, only one side of the coating pad 10 is prevented from receiving the impact force of the slurry 23, and the coating pad 10 is prevented from being deformed due to the uneven impact force.

In some embodiments, the connecting portion 16 is removably connected to the body portion 15. Specifically, it includes but is not limited to threaded connection, bolted connection, snap connection, etc. The connecting parts 16 and the main body part 15 are detachably connected, when the size and/or the number of the blocking parts 14 need to be changed, only the connecting parts 16 need to be detached and new connecting parts 16 need to be replaced, the application range of the coating gasket 10 can be widened, and the manufacturing cost can be reduced.

Referring to fig. 12 and 13, in some embodiments, the connecting portion 16 is provided with a protrusion 162, and the main body portion 15 is correspondingly provided with a recess 153, wherein the recess 153 is used for receiving the protrusion 162 to form a detachable connection between the connecting portion 16 and the main body portion 15.

Alternatively, the protrusion 162 may be disposed on the connecting portion 16, or may be disposed on the main body portion 15, and it is only necessary to ensure that the connecting portion 16 and the main body portion 15 are respectively provided with the protrusion 162 and the recess 153, which can be engaged with each other, so as to form the detachable connection between the connecting portion 16 and the main body portion 15. The shape of the convex portion 162 may be a cube, a prism, a cylinder, or a dovetail shape, which is not limited in the present application.

The detachable connection between the connecting part 16 and the main body part 15 is realized by the clamping connection of the concave part 153 and the convex part 162, so that the replacement and the maintenance of the connecting part 16 are facilitated.

Referring to fig. 14, in some embodiments, the coating pad 10 further includes a connecting member 17, the main body portion 15 and the connecting portion 16 are each provided with a connecting hole, and the connecting member 17 is provided in the connecting hole to form a detachable connection between the main body portion 15 and the connecting portion 16.

Alternatively, the main body 15 and the connecting portion 16 may be detachably connected by transition fitting of the connecting member 17 and the connecting hole. In some embodiments, the outer cylindrical surface of the connecting member 17 and the inner surface of the connecting hole are provided with mutually-matched threads to realize the detachable connection of the main body portion 15 and the connecting portion 16, and the connection strength of the main body portion 15 and the connecting portion 16 can be enhanced by the arrangement of the thread matching.

The detachable connection of the main body part 15 and the connecting part 16 is realized by arranging the connecting part 17, and only connecting holes need to be arranged on the main body part 15 and the connecting part 16, so that the connecting part 16 and the main body part 15 are simple in structure and easy to manufacture.

Referring to fig. 2 to 12, in some embodiments, the number of the blocking portions 14 is multiple, and the multiple blocking portions 14 are disposed in the flow passage 13 at intervals.

In some embodiments, a plurality of blocking portions 14 are disposed in the flow passage 13, and the plurality of blocking portions 14 are disposed at intervals in the second direction Y in the flow passage 13. The plurality of blocking portions 14 may be distributed at equal intervals or at unequal intervals along the second direction Y, which is not limited in the embodiment of the present application.

The heights of the plurality of barrier portions 14 in the thickness direction Z of the coating pad may be equal or different. During the charging and discharging process of the single battery, when the electrolyte between the pole pieces 20 is extruded and then flows back, the area located in the middle of the pole piece 20 is longer in the backflow path of the electrolyte than the area located at the edge of the pole piece 20, and the possibility of insufficient electrolyte content is higher. Therefore, optionally, in the second direction Y, the height of the blocking portion 14 located in the middle of the flow channel 13 is higher than the height of the blocking portion 14 located at the edge of the flow channel 13, so that in the coated pole piece 20, the depth of the thinned area 21 located in the middle of the pole piece 20 is higher than the depth of the thinned area 21 located at the edge of the pole piece 20, so that during the charging and discharging of the battery cell, sufficient electrolyte is stored in the area corresponding to the thinned area 21 in the middle of the pole piece 20 to ensure the life and safety of the battery cell.

Through setting up a plurality of blocking parts 14, can form a plurality of zones 21 that reduce on pole piece 20, can guarantee to have a plurality of regions that can preserve electrolyte between the pole piece 20 at the monomer charge-discharge in-process of battery, further guarantee the volume of the electrolyte between the pole piece 20, guarantee the free cycle life of battery.

As shown in fig. 9 and 10, the cross-sectional shape of the barrier portion 14 includes, but is not limited to, a rectangle, a trapezoid, a circular arc, etc. to coat the thinned area with different shapes to adapt to different usage environments.

In some embodiments, as shown in fig. 15, the width of the barrier portion 14 in the second direction Y gradually increases in the first direction X. Specifically, the change may be linear or non-linear. The width of barrier portion 14 on along the second direction Y sets up to the gradual change, when blockking thick liquids for thick liquids divide gradually under the direction of barrier portion 14 side, can reduce thick liquids 23 impact force to barrier portion 14 on the one hand, the life of extension coating gasket 10, on the other hand can reduce the fluctuation of thick liquids 23 in runner 13, makes the homogeneity of thick liquids 23 from discharge gate 12 outflow better, improves the uniformity of coating.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (11)

1. A coated gasket for use in coating a slurry onto a substrate to form a pole piece having a reduced thickness area disposed thereon, the reduced thickness area having a slurry thickness less than the slurry thickness of the remainder of the pole piece, comprising,

the feeding port is used for the inflow of the slurry;

the discharge port is used for outflow of the slurry;

and the flow channel is arranged between the feeding port and the discharge port and is used for communicating the feeding port with the discharge port, a blocking part is arranged in the flow channel and is used for blocking the slurry passing through the flow channel so as to form the thinning area on the pole piece.

2. The coated gasket of claim 1 wherein the height of said dam is less than the height of said flow channel in the direction of the thickness of said coated gasket.

3. The coated gasket of claim 1, wherein the blocking portion is disposed at an end of the flow channel close to the discharge port, and a distance between the blocking portion and the discharge port along a first direction is 0mm to 50mm, wherein the first direction is a flowing direction of the slurry on the flow channel.

4. The coated gasket of any of claims 1 to 3, wherein the coated gasket comprises,

a main body portion provided with an opening portion through which the slurry flows out;

the connecting part is connected with the main body part and arranged at the opening part, a bulge is arranged on the surface of the connecting part close to the flow channel, and the bulge forms the blocking part.

5. The coated gasket of claim 4 wherein the surface of the connecting portion facing away from the blocking portion is flush with the body portion surface.

6. The coated gasket of claim 4, wherein the coated gasket includes two connecting portions, the two connecting portions are disposed at intervals in the thickness direction of the coated gasket at the opening portion, and a gap between the two connecting portions forms part of the flow channel.

7. The coated gasket of any of claims 4 to 5 wherein the connecting portion is removably connected to the body portion.

8. The coated gasket of claim 7 wherein the connecting portion has a protrusion and the main body portion has a corresponding recess, the recess being configured to receive the protrusion to form a detachable connection between the connecting portion and the main body portion.

9. The coated gasket of claim 7 further comprising a connecting member, wherein the main body portion and the connecting portion are each provided with a connecting hole, and the connecting member is disposed in the connecting hole to form a detachable connection of the main body portion and the connecting portion.

10. The coated gasket of claim 1 wherein said barrier is plural in number, and a plurality of said barriers are spaced apart in said flow channel.

11. A coating apparatus comprising an upper die and a lower die, wherein the coating apparatus further comprises at least one coating shim according to any one of claims 1 to 10 disposed between the upper die and the lower die.

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