Coating device and battery production system
By setting a guide component inside the coating die to change the slurry flow direction, the problem of uneven coating of the coating die was solved, and the uniformity of the material output from the coating die and the production efficiency were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-04-07
AI Technical Summary
During the coating process, the coating amount in the middle area of the coating die is greater than that in the two sides, resulting in uneven coating, easy particle scratches, and the need for frequent disassembly and cleaning of the die, which affects production efficiency and cost.
A flow guide is installed inside the coating die head. By blocking and guiding the flow of the slurry, the flow direction of the slurry is changed, so that the slurry flows from both sides of the receiving tank to the center, thereby improving the uniformity of the material output from the coating die head and reducing the possibility of slurry settling.
It improves the uniformity of material output from the coating die, reduces the risk of slurry settling on both sides of the coating die outlet, reduces scratches on coating particles and the frequency of die cleaning, and improves production efficiency.
Smart Images
Figure CN224087149U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and more specifically, to a coating apparatus and a battery production system. Background Technology
[0002] In the production process of battery devices, a coating device is needed to coat the electrodes with an active material layer. The coating device includes a coating die.
[0003] When coating, the coating die of the coating device is used to coat the material. However, the coating amount in the middle area of the slurry outlet width direction is often greater than that in the two sides, which affects the quality of the coated electrode. Therefore, how to improve the uniformity of the material output from the coating die is a research direction in battery technology. Utility Model Content
[0004] This application provides a coating apparatus and a battery production system that can improve the uniformity of material output from the coating die.
[0005] In a first aspect, embodiments of this application provide a coating apparatus, including a coating die head, the coating die head including a first die head, a second die head, and a flow guide. The second die head is connected to the first die head and surrounds a receiving cavity. The receiving cavity has an inlet side for slurry to flow in and an outlet side for slurry to flow out. The arrangement direction from the inlet side to the outlet side intersects the arrangement direction from the first die head to the second die head. The flow guide is located inside the receiving cavity and is placed between the inlet side and the outlet side. The opposite ends of the flow guide along a first direction are respectively spaced apart from two opposite sidewalls of the receiving cavity along the first direction and surround a flow channel for slurry to flow. The first direction intersects the arrangement direction from the first die head to the second die head and intersects the arrangement direction from the inlet side to the outlet side.
[0006] By adopting the above technical solution, a flow guide is provided in the receiving cavity. The flow guide can block and guide the slurry flowing in from the feed side. After the slurry passes through the flow channels on both sides of the flow guide, it flows to the middle of the area between the flow guide and the discharge side. This changes the original tendency of the slurry to flow towards the middle of the receiving cavity to first flow towards the sides of the receiving cavity and then towards the middle. This can increase the flow velocity and pressure of the slurry on both sides of the receiving cavity, improve the consistency of slurry pressure in the middle and side areas of the receiving cavity, and reduce the pressure difference and flow velocity difference between the middle and side areas of the receiving cavity. This improves the uniformity of the coating die head output and reduces the risk of coating particle scratches caused by slurry settling due to slow discharge on both sides of the slurry outlet of the coating die head. In addition, the flow guide can also buffer the slurry after it enters the receiving cavity, reducing wear on the slurry outlet of the coating die head.
[0007] In some embodiments of this application, the receiving cavity includes a receiving groove disposed on the second mold head, the receiving groove includes a bottom wall and a plurality of side walls connected around the bottom wall, the flow guide is disposed on the bottom wall, the plurality of side walls include a first wall and a second wall opposite to each other along the first direction, one end of the opposite ends of the flow guide is spaced apart from the first wall and forms a flow channel, and the other end of the opposite ends of the flow guide is spaced apart from the second wall and forms another flow channel.
[0008] By adopting the above technical solution, the flow guide is directly set on the bottom wall of the receiving tank, and the two ends of the flow guide form two flow channels with the first wall and the second wall respectively. The structure is simple and it is easy to enclose the flow channels.
[0009] In some embodiments of this application, the guide and the second mold head are an integral piece.
[0010] By adopting the above technical solution, the flow guide and the second mold head are designed as a single piece. During processing, the two are integrally formed, which can eliminate the assembly process of the flow guide and the second mold head, and improve the connection stability between the flow guide and the second mold head.
[0011] In some embodiments of this application, the side of the guide member away from the bottom wall abuts against the surface of the first mold facing the second mold.
[0012] By adopting the above technical solution, the side of the guide member away from the bottom wall is placed against the first mold head, so that the slurry will not flow through the gap between the guide member and the first mold head, and the slurry can only flow along the guide of the guide member.
[0013] In some embodiments of this application, the height by which the guide protrudes from the bottom wall is equal to the height by which the side wall protrudes from the bottom wall.
[0014] By adopting the above technical solution, the protrusion height of the guide component is designed to be greater than or equal to the protrusion height of the side wall, so as to facilitate the abutment and cooperation between the guide component and the first mold head.
[0015] In some embodiments of this application, the size of the flow channel along the first direction is 50mm-150mm.
[0016] By adopting the above technical solution, the size of the flow channel along the first direction is designed to be 50mm-150mm. This not only facilitates the passage of slurry but also reduces the risk of the flow channel breaking due to excessive slurry conveying pressure. In addition, the flow channel with this gap allows the slurry to flow from both sides of the coating die to the middle after passing through the guide, improving the uniformity of the coating die output and reducing the possibility of slurry settling on both sides of the slurry outlet of the coating die.
[0017] In some embodiments of this application, the size of the flow channel along the first direction is 85mm-120mm.
[0018] By adopting the above technical solution, the passage of slurry can be further facilitated, the risk of rupture of the flow channel caused by excessive slurry conveying pressure can be reduced, and the uniformity of the material output from the coating die head can be further improved, reducing the possibility of slurry settling on both sides of the slurry outlet of the coating die head.
[0019] In some embodiments of this application, the second die head is provided with a slurry inlet communicating with the receiving groove, and the guide member has a first surface facing the slurry inlet, and the slurry inlet is disposed at the center of the first surface along the first direction.
[0020] By adopting the above technical solution, the slurry inlet is designed to be centered on the flow guide. The slurry flowing out of the slurry inlet is directly blocked and guided by the flow guide, and can flow out evenly to both sides. This improves the consistency of the pressure and flow rate of the slurry flowing through the flow channels on both sides, and enhances the uniformity of the slurry output on both sides of the coating die head.
[0021] In some embodiments of this application, the receiving cavity includes a receiving groove disposed on the second die head. The receiving groove includes a bottom wall and a plurality of side walls connected around the bottom wall. The plurality of side walls include a third wall facing the first surface. The distance between the first surface and the third wall gradually increases along a second direction from the center of the first surface to either end of the first surface in opposite directions along the first direction. The second direction is the arrangement direction from the feeding side to the discharging side.
[0022] By adopting the above technical solution, the first surface is designed with a structure that is convex in the middle and low on both sides, so that the first surface forms a guide surface structure, which makes it easier for the slurry to flow from the center of the first surface to both ends of the first surface along the first direction. Moreover, it can play a certain buffering role for the incoming material on the feed side and reduce the impact force of the slurry on the guide component.
[0023] In some embodiments of this application, the first surface is an arc surface.
[0024] By adopting the above technical solution, the arc surface can play a better guiding and buffering role.
[0025] In some embodiments of this application, the receiving cavity includes a receiving groove disposed on the second die head. The receiving groove includes a bottom wall and a plurality of side walls connected around the bottom wall. The plurality of side walls include a third wall located on the feeding side and a fourth wall located on the discharging side. Along the direction away from the bottom wall, the distance between the fourth wall and the third wall gradually increases along a second direction, where the second direction is the arrangement direction from the feeding side to the discharging side.
[0026] By adopting the above technical solution, the distance between the fourth wall and the third wall along the second direction is gradually increased in the direction away from the bottom wall, so that the fourth wall of the receiving groove forms an inclined structure. After the receiving groove and the first die head surround the receiving cavity, the space formed by the receiving cavity in the fourth wall gradually narrows in the direction close to the discharge side, thereby gradually increasing the pressure and flow rate of the slurry when the slurry is discharged, and realizing extrusion discharge.
[0027] In some embodiments of this application, along the second direction, the maximum distance between the guide member and the third wall is less than the minimum distance between the guide member and the fourth wall.
[0028] By adopting the above technical solution, the maximum distance between the guide and the third wall is designed to be less than or equal to the minimum distance between the guide and the fourth wall, so that the slurry can have greater pressure between the third and fourth walls to flow through the flow channels on both sides of the first direction, reducing the possibility of slurry deposition on both sides of the first direction, and reducing the pressure of the slurry flowing between the guide and the fourth wall, which facilitates the flow of slurry from both sides of the first direction to the middle.
[0029] In some embodiments of this application, along the second direction, the ratio of the maximum distance between the guide member and the third wall to the minimum distance between the guide member and the fourth wall ranges from 1 / 5 to 2 / 3.
[0030] By adopting the above technical solution, the possibility of slurry deposition on both sides in the first direction can be further reduced, and the slurry flowing between the guide and the fourth wall can be facilitated to flow to the middle.
[0031] Secondly, embodiments of this application provide a battery production system, including a coating apparatus as described in any of the above technical solutions. Attached Figure Description
[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.
[0033] Figure 1Exploded view of the coating die head of the coating apparatus provided in some embodiments of this application;
[0034] Figure 2 This is a schematic diagram of the structure of a second die head of a coating apparatus provided in some embodiments of this application;
[0035] Figure 3 A top view of a second die head of a coating apparatus provided in some embodiments of this application;
[0036] Figure 4 A top view of another second die head for a coating apparatus provided in some embodiments of this application;
[0037] Figure 5 A top view of another second die head of a coating apparatus provided in some embodiments of this application.
[0038] The reference numerals in the accompanying drawings for the specific embodiments are as follows:
[0039] 100. Coating die head;
[0040] 10. First mold head;
[0041] 20. Second mold head; 21. Receiving groove; 211. Bottom wall; 212. Side wall; 2121. First wall; 2122. Second wall; 2123. Third wall; 2124. Fourth wall; 213. First sub-groove; 214. Second sub-groove;
[0042] 30. Flow guide; 31. First surface; 32. Second surface;
[0043] 40. Receiving cavity; 41. Feed side; 42. Discharge side; 43. Flow channel;
[0044] 50. Gasket;
[0045] 60. Slurry import;
[0046] 70. Slurry outlet;
[0047] X, first direction; Y, second direction; Z, third direction. Detailed Implementation
[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "including," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0050] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.
[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0052] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0053] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.
[0054] Currently, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.
[0055] In the production process of battery devices, electrode coating is required. For example, extrusion coating can control the thickness of the electrode within a wide range, and has the advantages of fast coating speed, less susceptibility to external influences, and precise control of coating weight.
[0056] The extrusion coating apparatus includes a coating die, which may include an upper die, a lower die, and a spacer between them. The upper and lower dies together define a receiving cavity for receiving the slurry. The thickness of the spacer determines the thickness of the slurry outlet (lip) of the coating die.
[0057] In related technologies, the slurry inlet of the coating die is generally located in the middle of the width of the coating die. After the slurry enters the middle of the receiving cavity, it flows to both sides. This results in the slurry pressure on both sides of the coating die being lower than that in the middle area. After coating, not only is it easy for the coating thickness and weight in the middle area of the electrode to be greater than that on both sides, resulting in poor coating uniformity, but this slurry leveling method will also cause gel to accumulate on both sides of the coating die over a long period of time, leading to particle scratches in the coating and affecting the coating quality. Frequent disassembly and cleaning of the die is required, which seriously delays production efficiency and increases manufacturing costs.
[0058] Therefore, improving the uniformity of coating in the middle and side areas of the coating die is an important issue in battery production and processing.
[0059] In view of this, this application provides a technical solution that solves the above-mentioned technical problem by providing a receiving groove in the coating die head and a flow guide in the receiving groove, thereby changing the flow direction of the slurry by blocking and guiding the flow of the flow guide, so that the slurry flows from both sides of the receiving groove to the center.
[0060] The following is in conjunction with the appendix Figure 1-5 The coating apparatus provided in the embodiments of this application will be described.
[0061] Combined with appendix Figure 1-3 As shown, this application embodiment provides a coating apparatus, including a coating die 100. The coating die 100 includes a first die 10, a second die 20, and a flow guide 30. The second die 20 is connected to the first die 10 and encloses a receiving cavity 40. The receiving cavity 40 has an inlet side 41 for slurry to flow in and an outlet side 42 for slurry to flow out. The arrangement direction of the inlet side 41 to the outlet side 42 intersects the arrangement direction of the first die 10 to the second die 20. The flow guide 30 is located inside the receiving cavity 40 and is placed between the inlet side 41 and the outlet side 42. The opposite ends of the flow guide 30 along the first direction X respectively enclose a flow channel 43 for slurry to flow between the two opposite sidewalls 212 of the receiving cavity 40 along the first direction X. The first direction X intersects the arrangement direction of the first die 10 to the second die 20 and the arrangement direction of the inlet side 41 to the outlet side 42.
[0062] The coating die 100 can be an extrusion coating die. The coating die 100 includes a first die 10 and a second die 20. In some embodiments, the first die 10 is an upper die and the second die 20 is a lower die.
[0063] After the first die head 10 and the second die head 20 are spliced together, the receiving groove 21 of the second die head 20 and the first die head 10 form a receiving cavity 40 for slurry flow. The two opposite side walls 212 of the receiving cavity 40 along the first direction X are also the two opposite side walls 212 of the receiving groove 21 along the first direction X (the first wall 2121 and the second wall 2122 mentioned below). The coating die head 100 is provided with a slurry inlet 60 and a slurry outlet 70 communicating with the receiving cavity 40. The slurry inlet 60 can be provided in the second die head 20.
[0064] In this embodiment, the feed side 41 refers to the side of the receiving cavity 40 near the slurry inlet 60, and the discharge side 42 refers to the side of the receiving cavity 40 near the slurry outlet 70. The feed side 41 and the discharge side 42 are arranged opposite to each other in the second direction.
[0065] In some embodiments, the coating die 100 includes a gasket 50, which is installed between the first die 10 and the second die 20. The gasket 50 has an opening on its side near the discharge side 42, which, together with the first die 10 and the second die 20, encloses the slurry outlet 70. The portion of the gasket 50 other than the opening serves a sealing function, and the thickness of the slurry coating can be adjusted by adjusting the thickness of the gasket 50. The gasket 50 is typically made of a high-temperature resistant and wear-resistant material to withstand the high-temperature and high-pressure environment during the coating process.
[0066] In some embodiments, the coating apparatus may include, in addition to the coating die 100, an unwinding mechanism and a feeding mechanism (not shown in the figure), wherein the unwinding mechanism is used to unwind the electrode sheet, and the feeding mechanism is used to supply coating slurry to the coating die 100.
[0067] To address the issues of poor uniformity in the middle and sides of the coated electrode due to low discharge pressure and flow rate on both sides of the coating die 100 in the width direction, resulting in easy particle scratches and the need for frequent die cleaning, this embodiment installs a flow guide 30 within the receiving cavity 40. The length direction of the flow guide 30 is set along the first direction X in the figure. In some embodiments, the first direction X is the width direction of the coating die 100. The first direction X can be perpendicular to the arrangement direction of the first die 10 to the second die 20 (the third direction Z in the figure) and perpendicular to the arrangement direction of the feed side 41 to the discharge side 42 (the third direction Z in the figure).
[0068] The flow guide 30 is engaged with the inner wall of the receiving cavity 40 at opposite ends along the first direction X, thereby forming two flow channels 43 located on both sides of the receiving cavity 40. During the process of the slurry inlet 60 supplying slurry to the receiving cavity 40, the flow guide 30 can block and guide the slurry flowing in from the feed side 41. After passing through the flow channels 43 on both sides of the flow guide 30, the slurry flows to the middle of the area between the flow guide 30 and the discharge side 42, so that the slurry changes from the original trend of flowing towards the middle of the receiving tank 21 to first flowing towards both sides of the receiving tank 21 and then flowing towards the middle.
[0069] Compared to the original method where the slurry enters the receiving cavity 40 and flows from the middle to both sides, the slurry flow method provided in this embodiment can increase the flow velocity and pressure of the slurry on both sides of the receiving tank 21 due to the obstruction of the flow guide 30 and the guidance of the flow channel 43. This improves the consistency of slurry pressure in the middle and side areas of the receiving tank 21, reduces the pressure difference and flow velocity difference of the slurry in the middle and side areas of the receiving tank 21, and thus improves the uniformity of the material output from the coating die head 100.
[0070] Furthermore, it can reduce the possibility of slurry settling in the areas on both sides of the slurry outlet 70 of the coating die 100 due to slow discharge, thereby reducing the risk of scratches on the coated particles and reducing the frequency of cleaning the coating die 100, thus improving production efficiency.
[0071] In addition, the guide member 30 can also buffer the slurry after it enters the receiving tank 21, reducing wear on the slurry outlet 70 of the coating die head 100.
[0072] In some examples, optionally, the receiving cavity 40 includes a receiving groove 21 disposed on the second mold head 20. The receiving groove 21 includes a bottom wall 211 and a plurality of side walls 212 connected around the bottom wall 211. The flow guide 30 is disposed on the bottom wall 211. The plurality of side walls 212 include a first wall 2121 and a second wall 2122 opposite to each other along the first direction X. One end of the flow guide 30 along the opposite ends along the first direction X forms a flow channel 43 with the first wall 2121, and the other end of the flow guide 30 along the opposite ends forms another flow channel 43 with the second wall 2122.
[0073] The second mold head 20 is provided with a receiving groove 21. The lower surface of the first mold head 10 facing the second mold head 20, the receiving groove 21 and the gasket 50 together form the receiving cavity 40 of this embodiment.
[0074] Of course, the first mold head 10 may be provided with a receiving groove 21, or both the first mold head 10 and the second mold head 20 may be provided with receiving grooves 21 to form a receiving cavity 40 (the above two embodiments are not shown in the figure).
[0075] The flow guide 30 is disposed on the bottom wall 211. The flow guide 30 may be connected to the first mold head 10, or it may be connected to the second mold head 20, or it may be an integral part of the flow guide 30 and the second mold head 20 as described below.
[0076] The multiple side walls 212 of the receiving tank 21 include a first wall 2121 and a second wall 2122 opposite to each other along the first direction X. One end of the flow guide 30 along the first direction X forms a flow channel 43 with the first wall 2121, and the other end of the flow guide 30 along the first direction X forms a flow channel 43 with the second wall 2122. The flow guide 30 is directly set on the bottom wall 211 of the receiving tank 21. The two ends of the flow guide 30 form two flow channels 43 with the first wall 2121 and the second wall 2122 respectively. The structure is simple and it is convenient to form the flow channels 43.
[0077] The dimensions of the two flow channels 43 along the first direction X should be equal or approximately equal (e.g., the difference should not exceed 10 mm) so that the pressure and flow rate of the slurry flowing through the two flow channels 43 can be kept as consistent as possible.
[0078] In some examples, the guide 30 and the second mold head 20 are optionally integrated.
[0079] The flow guide 30 and the second mold head 20 are integrated parts, which means that the flow guide 30 and the second mold head 20 are directly formed into an integrated structure through mold manufacturing during processing, or the flow guide 30 and the second mold head 20 are connected into a whole by welding, hot melting or other methods.
[0080] The guide component 30 and the second mold head 20 are designed as a single piece, which can be integrally formed during processing. This eliminates the assembly process of the guide component 30 and the second mold head 20 and improves the connection stability between the guide component 30 and the second mold head 20.
[0081] In addition, there should be no seam at the connection between the integrated flow guide 30 and the second mold head 20, so that the slurry will not flow into the seam.
[0082] In some examples, optionally, the side of the guide member 30 facing away from the bottom wall 211 abuts against the surface of the first mold head 10 facing the second mold head 20.
[0083] When the guide member 30 and the second mold head 20 are integrated, the guide member 30 is located on the bottom wall 211 of the receiving groove 21. The upper surface of the guide member 30 away from the bottom wall 211 abuts against the lower surface of the first mold head 10. Abutting means that the upper surface of the guide member 30 and the lower surface of the first mold head 10 are tightly fitted together without forming a gap between them.
[0084] This structural design prevents the slurry from flowing between the guide member 30 and the first die head 10, and instead allows it to flow along the guide member 30. This increases the flow rate and pressure of the slurry on both sides of the receiving tank 21, thereby improving the consistency of slurry pressure in the middle and side areas of the receiving tank 21.
[0085] In some examples, optionally, the height of the guide 30 protruding from the bottom wall 211 is equal to the height of the side wall 212 protruding from the bottom wall 211.
[0086] The side of the guide member 30 away from the bottom wall 211 abuts against the surface of the first mold head 10 facing the second mold head 20, including at least three structural forms. One is that the height of the guide member 30 protruding from the bottom wall 211 is equal to the height of the side wall 212 protruding from the bottom wall 211. In this case, the lower surface of the first mold head 10 can be a planar structure, which can directly abut against the lower surface of the guide member 30.
[0087] Another configuration is where the height of the guide member 30 protruding from the bottom wall 211 is greater than the height of the side wall 212 protruding from the bottom wall 211. In this case, a groove needs to be formed on the lower surface of the first mold head 10 to accommodate the upper end of the guide member 30. Yet another configuration is where the height of the guide member 30 protruding from the bottom wall 211 is less than the height of the side wall 212 protruding from the bottom wall 211. In this case, a boss needs to be provided on the lower surface of the first mold head 10 to abut against the guide member 30.
[0088] Compared to the latter two implementations, the height of the guide member 30 protruding from the bottom wall 211 is designed to be equal to the height of the side wall 212 protruding from the bottom wall 211. This eliminates the need to process the aforementioned grooves and bosses on the first mold head 10, facilitating the mating of the guide member 30 with the first mold head 10, and also simplifies the structure and reduces manufacturing costs.
[0089] Combined with appendix Figure 3 As shown, in some examples, optionally, the size of the flow channel 43 along the first direction X is 50mm-150mm.
[0090] The dimension a of the flow channel 43 along the first direction X is the width of the flow channel 43. The dimension a is 50mm-150mm, for example, it can be 50mm, 70mm, 90mm, 120mm and 150mm, etc. This embodiment will not list them one by one.
[0091] The reason for adopting the above structural design is that if the dimension a of the flow channel 43 along the first direction X is too large, it will lead to excessive pressure, which will easily damage the flow channel 43 and make it difficult for the slurry to pass through. If the flow channel 43 is too large, it will not be effective in improving the uniformity of the material output from the coating die head 100, and the effect of suppressing the slurry settling caused by slow material output in the areas on both sides of the slurry outlet 70 will be reduced.
[0092] Therefore, in this embodiment, the size of the flow channel 43 along the first direction X is designed to be 50mm-150mm. This not only facilitates the passage of slurry but also reduces the risk of the flow channel 43 breaking due to excessive slurry conveying pressure. In addition, the flow channel 43 with this gap allows the slurry to flow from both sides of the width of the coating die 100 to the middle after passing through the guide member 30, improving the uniformity of the material output from the coating die 100 and reducing the possibility of slurry settling on both sides of the slurry outlet 70 of the coating die 100.
[0093] In some examples, optionally, the dimensions of the flow channel 43 along the first direction X are 85mm-120mm.
[0094] The dimension a of the flow channel 43 along the first direction X is designed to be 85mm-120mm, which is a further optimization based on the above dimension a of 50mm-150mm.
[0095] In some implementations, the dimension a of the flow channel 43 along the first direction X can be 85 mm, 90 mm, 100 mm, 110 mm, and 120 mm.
[0096] The flow channel 43 of this size can further facilitate the passage of slurry, reduce the risk of the flow channel 43 breaking due to excessive slurry conveying pressure, and further improve the uniformity of the output of the coating die 100, reducing the possibility of slurry settling on both sides of the slurry outlet 70 of the coating die 100.
[0097] Combined with appendix Figure 2 and attached Figure 3 As shown, in some examples, optionally, the second mold head 20 has a slurry inlet 60 communicating with the receiving groove 21, and the guide member 30 has a first surface 31 facing the slurry inlet 60, the slurry inlet 60 being disposed at the center of the first surface 31 along the first direction X.
[0098] The slurry inlet 60 can be connected to the slurry conveying pipeline (not shown in the figure) of the feeding mechanism of the coating device. The slurry from the feeding mechanism is conveyed to the slurry inlet 60 through the slurry conveying pipeline, and then directly enters the receiving tank 21 from the slurry inlet 60.
[0099] The reason for adopting the above design is that if the slurry inlet 60 is designed to be offset from the center of the first surface 31 along the first direction X, the slurry entering the slurry inlet 60 will have different distances from the two flow channels 43. The slurry will flow to the flow channel 43 that is closer, which will increase the slurry pressure and flow rate of one flow channel 43, while decreasing the slurry pressure and flow rate of the other flow channel 43. It is also impossible to achieve the purpose of balancing the slurry pressure and flow rate on both sides.
[0100] Therefore, in this embodiment, the slurry inlet 60 is positioned facing the center of the first surface 31 along the first direction X, so that the slurry can directly contact the middle of the guide member 30 after reaching it. The slurry will be divided into two uniform parts along the obstruction of the guide member 30 and flow out evenly to both sides of the guide member 30, thereby improving the consistency of the pressure and flow rate of the slurry flowing through the flow channels 43 on both sides and improving the uniformity of the material output from both sides of the slurry outlet 70 of the coating die head 100.
[0101] Combined with appendix Figure 4 and attached Figure 5 As shown, in some examples, optionally, the receiving cavity 40 includes a receiving groove 21 disposed on the second die head 20. The receiving groove 21 and the first die head 10 surround the receiving cavity 40. The receiving groove 21 includes a bottom wall 211 and a plurality of side walls 212 connected around the bottom wall 211. The plurality of side walls 212 include a third wall 2123 facing the first surface 31. From the center of the first surface 31 to any one of the opposite ends of the first surface 31 along the first direction X, the distance between the first surface 31 and the third wall 2123 along the second direction Y gradually increases. The second direction Y is the arrangement direction from the feed side 41 to the discharge side 42.
[0102] The first surface 31 is the surface of the guide member 30 used to directly receive and block the material from the slurry inlet 60. From the center of the first surface 31 to any one of the opposite ends of the first surface 31 along the first direction X, the distance between the first surface 31 and the third wall 2123 along the second direction Y gradually increases. This means that along the first direction X, the first surface 31 gradually moves away from the third wall 2123 from the center to both sides. This structure makes the first surface 31 form a surface structure that is convex in the middle and gradually concave to both sides along the first direction X.
[0103] The second direction Y is the arrangement direction from the feed side 41 to the discharge side 42. In some embodiments, the second direction Y is the thickness direction of the guide member 30.
[0104] In some embodiments, the first surface 31 may be Figure 4 The arc shape in the middle can also be Figure 5 The first surface 31 is a triangle with two symmetrical sides. It should be noted that the left and right sides of the first surface 31 along the first direction X should be symmetrical to improve the consistency of the pressure and flow rate of the slurry on both sides of the first surface 31.
[0105] The first surface 31 is designed with a structure that is convex in the middle and low on both sides. When the slurry flowing out of the slurry outlet 70 facing the center of the first surface 31 reaches the middle of the first surface 31, the slurry can flow more easily to the two flow channels 43 along the guides on both sides of the first surface 31 because the first surface 31 gradually moves away from the third wall 2123 from the center to both sides.
[0106] The first surface 31 of this structure forms a guide surface structure, which makes it easier for the slurry to flow from the center of the first surface 31 to both ends of the first surface 31 along the first direction X. It can also play a certain buffering role for the incoming material on the feed side 41, reducing the impact force of the slurry on the guide member 30.
[0107] In some examples, the first surface 31 is optionally an arc surface.
[0108] Arc surface refers to Figure 4 The curved surface formed by rotating an arc around the straight line containing its diameter, using the arc surface as the first surface 31, can better guide and buffer the slurry.
[0109] Specifically, the smooth transition of the arc surface allows for smoother flow of the slurry, reducing resistance caused by sharp turns or irregular surfaces. Furthermore, the flow path of the slurry on the arc surface is more stable, reducing slurry accumulation or uneven distribution caused by surface roughness, thus improving coating quality. In addition, the smooth transition of the arc surface reduces the impact and wear of the slurry on the guide surface. Moreover, by designing the curvature and angle of the arc surface, the flow speed and direction of the slurry can be controlled, reducing the generation of turbulence and eddies, further improving the uniformity and stability of the coating.
[0110] Combined again with the appendix Figure 2 As shown, in some examples, optionally, the receiving cavity 40 includes a receiving groove 21 disposed on the second die head 20. The receiving groove 21 and the first die head 10 surround the receiving cavity 40. The receiving groove 21 includes a bottom wall 211 and a plurality of side walls 212 connected around the bottom wall 211. The plurality of side walls 212 include a third wall 2123 located on the feeding side 41 and a fourth wall 2124 located on the discharging side 42. Along the direction away from the bottom wall 211, the distance between the fourth wall 2124 and the third wall 2123 gradually increases along the second direction Y. The second direction Y is the arrangement direction from the feeding side 41 to the discharging side 42.
[0111] Along the direction away from the bottom wall 211, the distance between the fourth wall 2124 and the third wall 2123 along the second direction Y gradually increases, so that the fourth wall 2124 forms an inclined wall structure. In some embodiments, the cross-sectional shape of the receiving groove 21 is trapezoidal along the cross-section parallel to the second direction Y and perpendicular to the first direction X.
[0112] This structural design allows the cavity 40 to be formed by the receiving groove 21 and the first die head 10. The space formed by the receiving cavity 40 on the fourth wall 2124 gradually narrows in the direction close to the discharge side 42, thereby gradually increasing the pressure and flow rate of the slurry when it is discharged, and realizing extrusion discharge.
[0113] Combined again with the appendix Figure 3 As shown, in some examples, optionally, along the second direction Y, the maximum distance between the guide member 30 and the third wall 2123 is less than the minimum distance between the guide member 30 and the fourth wall 2124.
[0114] The maximum distance b between the flow guide 30 and the third wall 2123 refers to the maximum distance between the first surface 31 and the third wall 2123. In some embodiments, the distance between the flow guide 30 and the third wall 2123 can be constant.
[0115] The flow guide 30 has a second surface 32 opposite to the first surface 31. The minimum distance c between the flow guide 30 and the fourth wall 2124 is the minimum distance between the second surface 32 and the fourth wall 2124. When the fourth wall 2124 is the inclined wall structure described above, the minimum distance c between the flow guide 30 and the fourth wall 2124 is the distance between the end of the fourth wall 2124 that connects to the bottom wall 211 and the second surface 32.
[0116] The flow guide 30 divides the receiving tank 21 into a first sub-tank 213 and a second sub-tank 214. The first sub-tank 213 and the second sub-tank 214 are connected by two flow channels 43. The first sub-tank 213 is used to directly receive the coating slurry. The coating slurry flows from the middle to both sides in the first sub-tank 213, while the slurry in the second sub-tank 214 flows from both sides to the middle.
[0117] The maximum distance between the guide member 30 and the third wall 2123 is designed to be less than or equal to the minimum distance between the guide member 30 and the fourth wall 2124, so that the volume of the first sub-tank 213 is smaller than the volume of the second sub-tank 214, and the dimension of the first sub-tank 213 along the second direction Y is smaller than the dimension of the second sub-tank 214. Therefore, when the slurry enters the smaller first sub-tank 213, it will receive greater pressure from the inner wall of the first sub-tank 213, which facilitates the flow of the slurry from the middle to both sides and reduces the possibility of slurry deposition.
[0118] Correspondingly, since the second sub-tank 214 has a larger dimension along the second direction Y, the slurry can have a sufficiently long flow distance after entering the second sub-tank 214, and the pressure on the slurry is also smaller. Therefore, the slurry flows evenly from both sides to the middle, and the flow pressure on both sides of the coating slurry is closer to the pressure in the middle, thereby improving the uniformity of the slurry flowing out at the slurry outlet 70 at both sides and the middle.
[0119] In some examples, optionally, the ratio of the maximum distance between the guide member 30 and the third wall 2123 to the minimum distance between the guide member 30 and the fourth wall 2124 along the second direction Y ranges from 1 / 5 to 2 / 3.
[0120] The ratio of the maximum distance b between the guide member 30 and the third wall 2123 to the minimum distance c between the guide member 30 and the fourth wall 2124 can be 1 / 5 to 2 / 3.
[0121] In some embodiments, b:c can be 1 / 5, 1 / 4, 1 / 3, 1 / 2, and 2 / 3, which will not be listed one by one in this embodiment.
[0122] This design can further increase the flow pressure of the slurry in the first sub-tank 213, reduce the possibility of slurry deposition on both sides in the first direction X, increase the flow extension of the slurry in the second sub-tank 214, and facilitate the flow of the slurry flowing between the guide member 30 and the fourth wall 2124 to the center, further improving the uniformity of coating.
[0123] Secondly, embodiments of this application provide a battery production system, including a coating device as described in any of the above technical solutions. In addition to the coating device, the battery production system may also include an electrode production device, a slurry production device, and a drying device (not shown in the figure). The electrode production device is used to produce electrode sheets, the slurry production device is used to produce slurry, the coating device is used to coat the slurry produced by the slurry production device onto the electrode sheets produced by the electrode production device, and the drying device is used to dry the electrode sheets after coating by the coating device.
[0124] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.
[0125] Combined with appendix Figure 1-5As shown in the figure, this application provides a coating apparatus, including a coating die 100. The coating die 100 includes a first die 10, a second die 20, and a flow guide 30. The second die 20 is connected to the first die 10 and surrounds a receiving cavity 40. The receiving cavity 40 has an inlet side 41 for slurry to flow in and an outlet side 42 for slurry to flow out. The arrangement direction of the inlet side 41 to the outlet side 42 intersects the arrangement direction of the first die 10 to the second die 20. The flow guide 30 is located in the receiving cavity 40 and is placed between the inlet side 41 and the outlet side 42. The two opposite ends of the flow guide 30 along the first direction X respectively surround the receiving cavity 40 to form a flow channel 43 for slurry to flow. The first direction X intersects the arrangement direction of the first die 10 to the second die 20 and intersects the arrangement direction of the inlet side 41 to the outlet side 42. The receiving cavity 40 includes a receiving groove 21 disposed on the second mold head 20. The receiving groove 21 includes a bottom wall 211 and a plurality of side walls 212 connected around the bottom wall 211. A flow guide 30 is disposed on the bottom wall 211. The plurality of side walls 212 include a first wall 2121 and a second wall 2122 opposite to each other along the first direction X. One end of the opposite ends of the flow guide 30 forms a flow channel 43 with the first wall 2121, and the other end of the opposite ends of the flow guide 30 forms another flow channel 43 with the second wall 2122. The flow guide 30 and the second mold head 20 are integral parts. The side of the flow guide 30 facing away from the bottom wall 211 abuts against the surface of the first mold head 10 facing the second mold head 20. The height of the flow guide 30 protruding from the bottom wall 211 is equal to the height of the side wall 212 protruding from the bottom wall 211. The size of the flow channel 43 along the first direction X is 50mm-150mm. Along the first direction X, the dimensions of the flow channel 43 are 85mm-120mm. The second die head 20 has a slurry inlet 60 communicating with the receiving groove 21. The guide member 30 has a first surface 31 facing the slurry inlet 60, and the slurry inlet 60 is positioned at the center of the first surface 31 along the first direction X. The receiving cavity 40 includes a receiving groove 21 disposed on the second die head 20. The receiving groove 21 includes a bottom wall 211 and a plurality of side walls 212 connected around the bottom wall 211. The plurality of side walls 212 includes a third wall 2123 facing the first surface 31. From the center of the first surface 31 to any one of the opposite ends of the first surface 31 along the first direction X, the distance between the first surface 31 and the third wall 2123 gradually increases along the second direction Y. The second direction Y is the arrangement direction from the feed side 41 to the discharge side 42. The first surface 31 is an arc surface. The receiving cavity 40 includes a receiving groove 21 disposed on the second die head 20. The receiving groove 21 includes a bottom wall 211 and a plurality of side walls 212 connected around the bottom wall 211. The plurality of side walls 212 include a third wall 2123 located on the feeding side 41 and a fourth wall 2124 located on the discharging side 42. Along the direction away from the bottom wall 211, the distance between the fourth wall 2124 and the third wall 2123 gradually increases along the second direction Y. The second direction Y is the arrangement direction from the feeding side 41 to the discharging side 42.Along the second direction Y, the maximum distance between the guide member 30 and the third wall 2123 is less than the minimum distance between the guide member 30 and the fourth wall 2124. Along the second direction Y, the ratio of the maximum distance between the guide member 30 and the third wall 2123 to the minimum distance between the guide member 30 and the fourth wall 2124 ranges from 1 / 5 to 2 / 3.
[0126] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A coating apparatus, characterized in that, Includes a coating die head, the coating die head comprising: First mold head; A second die head, connected to the first die head and surrounding a receiving cavity, the receiving cavity having an inlet side for slurry inflow and an outlet side for slurry outflow, the arrangement direction of the inlet side to the outlet side intersecting the arrangement direction of the first die head to the second die head; and A flow guide is located inside the receiving cavity and positioned between the feeding side and the discharging side. The two opposite ends of the flow guide along the first direction are respectively spaced apart from the two opposite sidewalls of the receiving cavity along the first direction and form a flow channel for the slurry to flow. The first direction intersects the arrangement direction of the first die head to the second die head and intersects the arrangement direction of the feeding side to the discharging side.
2. The coating apparatus according to claim 1, characterized in that, The receiving cavity includes a receiving groove disposed on the second mold head. The receiving groove includes a bottom wall and a plurality of side walls connected around the bottom wall. The flow guide is disposed on the bottom wall. The plurality of side walls include a first wall and a second wall opposite to each other along the first direction. One end of the opposite ends of the flow guide is spaced apart from the first wall and forms a flow channel. The other end of the opposite ends of the flow guide is spaced apart from the second wall and forms another flow channel.
3. The coating apparatus according to claim 2, characterized in that, The flow guide and the second mold head are a single piece.
4. The coating apparatus according to claim 2, characterized in that, The side of the guide member away from the bottom wall abuts against the surface of the first mold facing the second mold.
5. The coating apparatus according to claim 4, characterized in that, The height by which the guide protrudes from the bottom wall is equal to the height by which the side wall protrudes from the bottom wall.
6. The coating apparatus according to claim 1, characterized in that, Along the first direction, the size of the flow channel is 50mm-150mm.
7. The coating apparatus according to claim 6, characterized in that, Along the first direction, the dimensions of the flow channel are 85mm-120mm.
8. The coating apparatus according to claim 1, characterized in that, The second mold head has a slurry inlet that communicates with the receiving cavity. The guide member has a first surface facing the slurry inlet, and the slurry inlet is disposed at the center along the first direction facing the first surface.
9. The coating apparatus according to claim 8, characterized in that, The receiving cavity includes a receiving groove disposed on the second die head. The receiving groove includes a bottom wall and a plurality of side walls connected around the bottom wall. The plurality of side walls include a third wall facing the first surface. The distance between the first surface and the third wall gradually increases along a second direction from the center of the first surface to either end of the first surface in opposite directions along the first direction. The second direction is the arrangement direction from the feeding side to the discharging side.
10. The coating apparatus according to claim 8, characterized in that, The first surface is an arc surface.
11. The coating apparatus according to any one of claims 1-10, characterized in that, The receiving cavity includes a receiving groove disposed on the second die head. The receiving groove includes a bottom wall and a plurality of side walls connected around the bottom wall. The plurality of side walls include a third wall located on the feeding side and a fourth wall located on the discharging side. Along the direction away from the bottom wall, the distance between the fourth wall and the third wall gradually increases along a second direction, which is the arrangement direction from the feeding side to the discharging side.
12. The coating apparatus according to claim 11, characterized in that, Along the second direction, the maximum distance between the guide member and the third wall is less than the minimum distance between the guide member and the fourth wall.
13. The coating apparatus according to claim 12, characterized in that, Along the second direction, the ratio of the maximum distance between the guide member and the third wall to the minimum distance between the guide member and the fourth wall ranges from 1 / 5 to 2 / 3.
14. A battery production system, characterized in that, Includes the coating apparatus as described in any one of claims 1-13.