Coating die and coating apparatus

Abstract

The application relates to the technical field of battery manufacturing, and provides a coating die and a coating device. The coating die comprises a die body with a feeding port, a cavity arranged in the die body, and discharge ports arranged at the two ends of the length direction of the die body, the cavity is in communication with the feeding port and each discharge port, at least the positions corresponding to the edges of the cavity at the two ends of the length direction of the die body are formed with corners, and each discharge port is arranged close to the corner at the same end. The slurry sedimentation of the coating die can be reduced, and the use quality of the coating device is improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a coating die and coating apparatus. Background Technology

[0002] With the continuous development of new energy technologies, battery manufacturing processes are also constantly improving. In the production process of lithium-ion batteries, electrode coating is an essential step, and extrusion coating is often used to coat the electrodes.

[0003] In a coating apparatus, the coating die is a key component, through which the coating slurry is applied onto the electrode. However, during the coating process, due to the material properties of the slurry, some of it settles inside the coating die, affecting the coating quality of the electrode and hindering the improvement of the coating apparatus's overall performance. Utility Model Content

[0004] In view of this, the present application aims to provide a coating die head to improve the quality of use of the coating apparatus.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A coating die head includes a die head body with a feed inlet, a cavity disposed in the die head body, and a discharge outlet disposed at both ends of the die head body along its length. The cavity is connected to the inlet and each of the outlets. At least both ends of the die head body along its length are formed with corners corresponding to the edges of the cavity, and each outlet is located near the corner at the same end.

[0006] Furthermore, the die head body includes a lower die head and an upper die head; the cavity is formed between the lower die head and the upper die head, the corner is formed on the lower die head near the upper die head, and each of the discharge ports is located on the lower die head.

[0007] Furthermore, each of the aforementioned discharge ports is connected to the corresponding corner.

[0008] Furthermore, the feed port is located at the middle of the length direction of the die head body.

[0009] Furthermore, the corner is an R-angle.

[0010] Compared with related technologies, this application has the following advantages: (1) The coating die head described in this application has corners formed at the edge of the cavity and each discharge port is set close to the corner of the corresponding end. This can optimize the flow path of the slurry in the cavity, reduce the dead flow corners and slurry deposition at both ends of the cavity in the length direction of the die head body, reduce coating defects caused by slurry deposition and drying, and set the discharge ports at both ends of the length direction of the die head body so that the slurry in the cavity can be discharged from both ends in time, which helps to ensure the coating uniformity of the coating die head.

[0011] (2) By making the die head body include a lower die head and an upper die head, it is convenient to process and form the cavity, and the corner is formed at the position of the lower die head close to the upper die head, and the discharge port is set on the lower die head, which can improve the smoothness of the slurry flow to the discharge port.

[0012] (3) By connecting the outlet with the corresponding corner, the flow distance of the slurry from the corner to the outlet can be shortened, the slurry residence time at the corner can be reduced, which helps to ensure the fluidity of the slurry and facilitates the design and implementation.

[0013] (4) By placing the feed inlet in the middle of the length of the die head body, it is beneficial for the slurry to flow symmetrically to both ends in the cavity, balance the flow pressure and flow rate in the cavity, and improve the uniformity of coating of the coating die head.

[0014] (5) By making the corners R-angles, the flow resistance of the slurry can be reduced, the flow of the slurry can be facilitated, and turbulence or eddies can be avoided at the corners, which is beneficial to the uniformity of coating and helps the design and implementation.

[0015] This application also proposes a coating apparatus, including a coating die as described above.

[0016] Furthermore, it also includes a slurry storage unit, a feeding pipe connecting the slurry storage unit to the inlet, and a return pipe connecting the slurry storage unit to each of the outlets, wherein the slurry storage unit is connected to the feeding pipe via a pumping unit.

[0017] Furthermore, a flow control valve is provided between each of the return pipes and the corresponding discharge port.

[0018] Furthermore, it also includes a collection pipe; each of the return pipes is connected to the slurry storage unit through the collection pipe.

[0019] Furthermore, the slurry storage unit is a storage tank, and the pumping unit is a screw pump.

[0020] The coating apparatus described in this application, by setting the coating die head as described above, can reduce the slurry retention in the coating die head, ensure smooth slurry flow, improve coating uniformity, and thus help improve the quality of use of the coating apparatus.

[0021] Furthermore, the slurry circulation system is formed by the slurry storage unit, feeding pipe, return pipe, and pumping unit, which has a simple structure and is easy to design and implement. The flow control valve facilitates the control of the return flow at each end of the coating die, thus helping to balance the slurry flow at both ends of the die.

[0022] Furthermore, the use of a central conduit facilitates optimized pipeline layout, resulting in a simple structure and easy arrangement. By employing a storage tank for the slurry storage unit and a screw pump for the pumping unit, slurry can be stored stably, ensuring continuous supply. This also ensures stable slurry flow and minimal pressure fluctuations, thereby improving supply stability and coating quality, and facilitating design and implementation. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the coating die head described in the embodiments of this application; Figure 2 This is a schematic diagram of the coating apparatus described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Die body; 101. Feed inlet; 102. Discharge outlet; 103. Corner; 2. Slurry storage unit; 3. Feed pipe; 4. Return pipe; 5. Pumping unit; 6. Collection pipe; S. Cavity. Detailed Implementation

[0024] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0026] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0028] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0030] An embodiment of the first aspect of this application provides a coating die head, which is applied in a coating apparatus and is mainly used as an actuator for coating operations. The coating die head in this embodiment, with its innovative structural design, can reduce slurry deposition and help improve the quality of use of the coating apparatus.

[0031] In related technologies, with the continuous development of new energy technologies, battery manufacturing processes are also constantly improving. In the production process of lithium-ion batteries, electrode coating is an essential step, and extrusion coating is often used to coat the electrodes.

[0032] In a coating apparatus, the coating die is a key component. The slurry is fed into the coating die and coated onto the electrode. However, during the coating process, due to the material properties of the slurry, some slurry settles inside the coating die, affecting the coating quality of the electrode and hindering the improvement of the overall performance of the coating apparatus.

[0033] In view of this, in order to overcome the shortcomings of the related technology, the coating die head in this embodiment combines... Figure 1 and Figure 1 As shown, the overall design includes a die head body 1 with a feed inlet 101, a cavity S in the die head body 1, and a discharge outlet 102 at both ends of the die head body 1 along its length.

[0034] The cavity S is connected to the inlet 101 and each outlet 102. At least both ends of the die head body 1 along the length direction are formed with corners 103 corresponding to the edges of the cavity S, and each outlet 102 is set close to the corner 103 at the same end.

[0035] Therefore, by forming corners 103 at the edge of the cavity S and setting each discharge port 102 close to the corners 103 at the corresponding ends, the flow path of the slurry in the cavity S can be optimized, reducing the dead angles and slurry deposition at both ends of the cavity S in the length direction of the die head body 1, reducing coating defects caused by slurry deposition and drying, and setting the discharge ports 102 at both ends in the length direction of the die head body 1, the slurry in the cavity S can be discharged from both ends in a timely manner, which helps to ensure the coating uniformity of the coating die head.

[0036] Based on the above overall introduction, specifically regarding the mold head body 1 in this embodiment, combined with... Figure 1 As shown, it generally includes an inlet 101, an outlet 102, and a cavity S.

[0037] The above-mentioned inlet 101 is used to supply slurry into the cavity S, and the above-mentioned outlet 102 is used to supply slurry out of the cavity S. The arrangement of the above-mentioned inlet 101 and outlet 102 on the die head body 1 can be based on the arrangement of the inlet 101 and outlet 102 on the die head body 1 of existing coating dies (such as being fixed on the die head body 1, etc.), and will not be described in detail here.

[0038] Furthermore, the material and shape of the above-mentioned mold head body 1 can also be referenced from the material and shape of the existing coating mold head body 1, and will not be repeated here.

[0039] The die head body 1 is also provided with a die lip for coating. The die lip is connected to the cavity S and is positioned towards the electrode during coating. The die lip of the coating die head in this embodiment can be based on the existing die lip of the coating die head, and will not be described in detail here.

[0040] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, make the mold body include a lower mold head and an upper mold head.

[0041] The cavity S is formed between the lower die head and the upper die head, the corner 103 is formed at the position of the lower die head near the upper die head, and each discharge port 102 is located on the lower die head.

[0042] It is understandable that by making the die head body 1 include a lower die head and an upper die head, it is convenient to process and form the cavity S, and the corner 103 is formed at the position of the lower die head close to the upper die head, and the discharge port 102 is set on the lower die head, which can improve the smoothness of the slurry flow to the discharge port 102.

[0043] In practical implementation, the upper and lower die heads can be, for example, separate structures, with the upper and lower die heads fastened together, forming a cavity S between them. The shape of the cavity S can be referenced from the shape of the cavity S in existing coating dies, and will not be elaborated here.

[0044] Continue to combine Figure 1 As shown, in some exemplary embodiments, the corner 103 is formed at a position near the upper die head on the lower die head, and the discharge port 102 is located on the lower die head. In this embodiment, for example, each discharge port 102 can be connected to the corresponding corner 103.

[0045] It is understandable that by connecting the outlet 102 with the corresponding corner 103, the flow distance of the slurry from the corner 103 to the outlet 102 can be shortened, the slurry residence time at the corner 103 can be reduced, which helps to ensure the fluidity of the slurry and facilitates design and implementation.

[0046] In specific implementation, the die head body 1 is provided with a through hole, which communicates with the corner 103. The discharge port 102 is located on the through hole and communicates with the corner 103 through the through hole to supply slurry flow. Preferably, when the corner 103 is an R-angle, the bottom edge of the through hole is flush with the bottom edge of the cavity S, and the diameter of the through hole and the diameter of the corner 103 satisfy a 1:2 relationship, that is, the diameter of the through hole is half the diameter of the corner 103, so as to better supply slurry outflow and reduce settling.

[0047] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, have the feed port 101 located at the middle of the length direction of the die body 1.

[0048] It is understandable that by placing the feed inlet 101 in the middle of the length of the die head body 1, the slurry can flow symmetrically to both ends in the cavity S, balancing the flow pressure and flow rate in the cavity S, and improving the uniformity of coating by the coating die head.

[0049] In practical implementation, the middle part of the length direction of the above-mentioned die head body 1 is the middle part of the cavity S, and the feed port 101 is located at the middle part of the length direction of the die head body 1 so that it can communicate with the middle part of the cavity S.

[0050] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, make corner 103 an R-angle.

[0051] It is understandable that by making the corner 103 an R-angle, the flow resistance of the slurry can be reduced, the flow of the slurry can be facilitated, and turbulence or eddies can be avoided at the corner 103, which is conducive to the uniformity of coating and thus helps the design and implementation.

[0052] In practical implementation, the R-corner (rounded corner) of the coating die is a key structure designed to optimize fluid flow during the coating process, reduce dead corners, and improve coating uniformity. Its formation position is closely related to the functional area of ​​the die.

[0053] Specifically, setting the corner 103 of the cavity S edge to an R-angle optimizes the flow state of the slurry within the flow channel, avoiding sudden changes in local flow velocity, pressure loss, or eddies caused by the right-angle corner 103. It reduces slurry accumulation and retention at the corner 103, preventing slurry deterioration (such as solidification or delamination) due to prolonged residence. This ensures a more uniform distribution of the slurry before entering the mold lip, laying the foundation for subsequent coating quality.

[0054] It is worth noting that, regarding the coating die head of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still […]. Figure 1 As shown, it may include, for example, a mold head body 1.

[0055] The die head body 1 is provided with a feed inlet 101 and a discharge outlet 102, and a cavity S is provided inside the die head body 1. The feed inlet 101 is located in the middle of the length direction of the die head body 1, and the discharge outlet 102 is located at both ends of the length direction of the die head body 1, and is connected to the corner 103 formed at the positions corresponding to the edges of the cavities S at both ends of the length direction of the die head body 1.

[0056] The die head body 1 includes an upper die head and a lower die head. The cavity S is formed between the lower die head and the upper die head. The corner 103 is formed on the lower die head near the upper die head. Each discharge port 102 is located on the lower die head, and the corner 103 is an R-angle.

[0057] In the preferred embodiment of the coating die head described above, the specific configuration and arrangement of the die head body 1, the inlet 101, the outlet 102, and the corner 103 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the die head body 1, the inlet 101, the outlet 102, and the corner 103 can also be referred to the descriptions in the above exemplary embodiments.

[0058] The coating die head of this embodiment adopts the above design. By setting the coating die head as described above, the slurry retention in the coating die head can be reduced, the slurry flow can be ensured to be smooth, the coating uniformity can be improved, and the quality of use of the coating device can be improved.

[0059] An embodiment of the second aspect of this application provides a coating apparatus comprising a coating die as described above.

[0060] In the coating apparatus of this embodiment, the coating die head is the core component of the coating apparatus and is generally connected to other related structures in the coating apparatus. The connection form between the coating die head and other structures in the coating apparatus can be referenced from the connection form between the coating die head and other related structures in existing coating apparatuses, and will not be described in detail here.

[0061] Therefore, by setting the coating die head as described above, the slurry retention in the coating die head can be reduced, ensuring smooth slurry flow and improving coating uniformity, which helps to improve the quality of use of the coating device.

[0062] Combination Figure 2 As shown, as an exemplary embodiment, this embodiment may include, for example, a coating apparatus further comprising a slurry storage unit 2, a feeding pipe 3 connecting the slurry storage unit 2 to the feed inlet 101, and a return pipe 4 connecting the slurry storage unit 2 to each discharge outlet 102, and the slurry storage unit 2 is connected to the feeding pipe 3 via a pumping unit 5.

[0063] It is understandable that the slurry circulation system is formed by setting up the slurry storage unit 2, the feeding pipe 3, the return pipe 4 and the pumping unit 5. The structure is simple and easy to design and implement.

[0064] In practical implementation, the configuration of the above slurry storage unit 2, feeding pipe 3, return pipe 4 and pumping unit 5 can all be based on the configuration of the relevant structures in the existing coating device, and will not be elaborated here.

[0065] Continue to combine Figure 2 As shown, as an exemplary implementation, this embodiment may, for example, provide a flow control valve between each return pipe 4 and its corresponding outlet 102.

[0066] Understandably, by setting the flow control valve, it is easy to control the return flow at each end of the coating die head, which helps to balance the slurry flow at both ends of the die head.

[0067] In practical implementation, the above flow valve settings can also be referenced from the flow valves in existing coating devices, and will not be elaborated further here.

[0068] Continue to combine Figure 2As shown, as an exemplary embodiment, this embodiment may include a consolidation pipe 6, wherein each of the above return pipes 4 is connected to the slurry storage unit 2 through the consolidation pipe 6.

[0069] Understandably, the installation of the main pipe 6 facilitates the optimization of the pipeline layout, and its simple structure makes it easy to arrange.

[0070] In practical implementation, one end of the above-mentioned collection pipe 6 is connected to the slurry storage unit 2, and the other end is connected to each return pipe 4 through a tee. The arrangement of the above-mentioned collection pipe 6 can refer to the arrangement of the collection pipe 6 in the existing coating device, and will not be described in detail here.

[0071] As an exemplary embodiment, this embodiment may, for example, make the slurry storage unit 2 a storage tank and the pumping unit 5 a screw pump.

[0072] Understandably, by using a storage tank for the slurry storage unit 2 and a screw pump for the pumping unit 5, the slurry can be stored stably, ensuring continuous supply. It can also ensure stable slurry flow and small pressure fluctuations, which helps to improve the stability of the supply and the coating quality, and facilitates design and implementation.

[0073] Furthermore, in the non-coating state, the coating device in this embodiment can pump slurry into the coating die head through the pumping unit 5, so that the slurry in the coating die head flows, and the slurry storage unit 2 stores the returned slurry, thereby avoiding slurry waste.

[0074] The coating apparatus of this embodiment, by setting the coating die head as described above, can reduce the slurry retention in the coating die head, ensure smooth slurry flow, improve coating uniformity, and thus help improve the quality of use of the coating apparatus.

[0075] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A coating die head, characterized in that: It includes a die head body with a feed inlet, a cavity disposed in the die head body, and a discharge outlet disposed at both ends of the die head body along its length. The cavity is connected to the inlet and each of the outlets. At least both ends of the die head body along its length are formed with corners corresponding to the edges of the cavity, and each outlet is located near the corner at the same end.

2. The coating die head according to claim 1, characterized in that: The die head body includes a lower die head and an upper die head; The cavity is formed between the lower die head and the upper die head, the corner is formed on the lower die head near the upper die head, and each of the discharge ports is located on the lower die head.

3. The coating die head according to claim 2, characterized in that: Each of the aforementioned discharge ports is connected to the corresponding corner.

4. The coating die head according to claim 1, characterized in that: The feed port is located at the middle of the length of the die head body.

5. The coating die head according to any one of claims 1 to 4, characterized in that: The corner is an R-angle.

6. A coating apparatus, characterized in that: The coating die head includes any one of claims 1 to 5.

7. The coating apparatus according to claim 6, characterized in that: It also includes a slurry storage unit, a feeding pipe connecting the slurry storage unit to the feed inlet, and a return pipe connecting the slurry storage unit to each of the discharge outlets, wherein the slurry storage unit is connected to the feeding pipe via a pumping unit.

8. The coating apparatus according to claim 7, characterized in that: Each of the return pipes and its corresponding discharge port is provided with a flow control valve.

9. The coating apparatus according to claim 7, characterized in that: It also includes a summary tube; Each of the return pipes is connected to the slurry storage unit via the collection pipe.

10. The coating apparatus according to any one of claims 7 to 9, characterized in that: The slurry storage unit is a storage tank, and the pumping unit is a screw pump.

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