Special-shaped lamination and coating system and coating process thereof

Abstract

The invention discloses a special-shaped lamination as well as a coating system and a coating process thereof, and belongs to the technical field of coating die heads. The coating system of the special-shaped lamination comprises a double-layer coating die head, wherein the double-layer coating die head is provided with an upper cavity and a lower cavity which are independently controlled; the first feeding mechanism is arranged on the upper cavity of the double-layer coating die head, and slurry is supplied to the upper cavity of the double-layer coating die head through the first feeding mechanism, so that clearance coating is carried out on the base material, and an L-shaped linear area is formed; the second feeding mechanism is arranged on the lower cavity of the double-layer coating die head, and slurry is supplied to the lower cavity of the double-layer coating die head through the second feeding mechanism, so that continuous coating is carried out on the base material, and an L-shaped vertical-line-shaped area is formed. According to the double-layer coating die head disclosed by the invention, an L-shaped coating is jointly formed by a coating I-shaped area between the upper cavities and a coating I-shaped area between the lower cavities, and the process is changed from continuous coating to intermittent coating, so that positive electrode slurry is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery coating, and specifically relates to a special-shaped coating system and coating process for L-shaped laminated sheets. Background Art

[0002] In the production process of lithium-ion batteries, for L-shaped laminated batteries, the continuously coated electrode sheets need to be die-cut and laminated to manufacture L-shaped battery cores that meet the size requirements. The prior art usually adopts a single-chamber extrusion continuous coating method and uses a single-layer coating gasket. This method has the following problems:

[0003] 1. The utilization rate of the slurry is low, only 60% - 70%, resulting in a large waste of the main positive electrode material;

[0004] 2. During the coating process, the pressure fluctuates greatly, and the consistency of the surface density is poor;

[0005] 3. It cannot achieve the function of L-shaped coating, and subsequent cutting is required, further reducing the material utilization rate. Summary of the Invention

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A coating system for special-shaped laminated sheets, comprising:

[0008] A double-layer coating die head, the double-layer coating die head having an independently controlled upper cavity and lower cavity;

[0009] A first feeding mechanism, the first feeding mechanism being arranged on the upper cavity of the double-layer coating die head and supplying slurry to the upper cavity of the double-layer coating die head through the first feeding mechanism to perform intermittent coating on a substrate to form an "one" region of the L shape;

[0010] A second feeding mechanism, the second feeding mechanism being arranged on the lower cavity of the double-layer coating die head and supplying slurry to the lower cavity of the double-layer coating die head through the second feeding mechanism to perform continuous coating on the substrate to form a "vertical bar" region of the L shape;

[0011] Wherein, the "one" region and the "vertical bar" region jointly form a complete L-shaped coating region.

[0012] Furthermore, the double-layer coating die head is further provided with an upper cavity feed port and a lower cavity feed port;

[0013] The upper cavity feed port is located on the upper cavity of the double-layer coating die head and is connected to the first feeding mechanism for introducing the slurry into the internal flow channel of the upper cavity;

[0014] The lower cavity feed port is located on the lower cavity of the double-layer coating die head and is connected to the second feeding mechanism for introducing the slurry into the internal flow channel of the lower cavity.

[0015] Furthermore, two independent discharge slits are provided on the discharge surface of the double-layer coating die head: an upper interlayer coating discharge port and a lower continuous coating discharge port;

[0016] The upper interlayer coating discharge port is connected to the flow channel of the upper cavity and is used for intermittently coating the slurry on the substrate to form the horizontal "-" area of the L-shaped coating; the lower continuous coating discharge port is connected to the flow channel of the lower cavity and is used for continuously coating the slurry on the substrate to form the vertical "|" area of the L-shaped coating;

[0017] Among them, the upper interlayer coating discharge port and the lower continuous coating discharge port are arranged at a specific angle in space and cooperate together to output a complete "L" - shaped coating.

[0018] Furthermore, surface density adjusting micrometers for precisely fine-tuning the slit gap are provided on both the upper interlayer coating discharge port and the lower continuous coating discharge port.

[0019] Furthermore, an upper cavity pressure sensor is arranged in the flow channel of the upper cavity of the double-layer coating die head for real-time monitoring of the extrusion pressure of the slurry in the upper cavity;

[0020] A lower cavity pressure sensor is arranged in the flow channel of the lower cavity of the double-layer coating die head for independently and real-time monitoring of the extrusion pressure of the slurry in the lower cavity.

[0021] Furthermore, both the first feeding mechanism and the second feeding mechanism use an electric cylinder valve group to control the flow rate and on / off of supplying the slurry to the upper cavity and the lower cavity.

[0022] Furthermore, a control unit for independently controlling the coating actions of the upper cavity and the lower cavity is further included, and the control unit is respectively connected to the upper cavity pressure sensor, the lower cavity pressure sensor, and the electric cylinder valve group.

[0023] A coating process for special-shaped laminated sheets is carried out by using the special-shaped coating system described in any one of the above.

[0024] A coating process for special-shaped laminated sheets, the coating process includes:

[0025] S1: Adjust the parameters of the coating PLC program to make the upper and lower cavities of the double-layer coating independently controlled, and make the upper cavity have gap coating and the lower cavity have continuous coating;

[0026] S2: Respectively introduce the slurry into the internal flow channel of the upper cavity and the internal flow channel of the lower cavity;

[0027] S3: First, perform single-sided coating. After the single-sided coating is completed, adjust the starting coating optical fiber for double-sided coating to align with the single-sided size control position in the intermediate coating area.

[0028] S4: Detect the coating width and adjust it using the die head lateral closed-loop function.

[0029] S5: Adjust the head and tail size misalignment parameters of the coating film area at the continuous coating position.

[0030] S5: Perform double-sided coating.

[0031] A special-shaped laminated sheet is prepared by using the coating process described in any one of the above.

[0032] Beneficial effects:

[0033] The present invention improves the utilization rate of the slurry. The intermediate coating in the upper cavity of the double-layer coating die head coats the "one" area, and the continuous coating in the lower cavity coats the "vertical" area, jointly forming an "L" - shaped coating. The process changes from full coating to intermittent coating, saving the positive electrode slurry. The valve group is replaced from a pneumatic valve group to an electric cylinder valve group, and the reaction speed of the electric cylinder valve group meets the reaction speed requirements of small gaps. The coating PLC program is updated to independently control the upper and lower cavities of the double-layer coating. The upper cavity performs intermittent coating and the lower cavity performs continuous coating, solving the problem that only the double cavities could act together before. It improves the utilization rate of the electrode sheet material. The part that originally needed to be cut is coated without coating, with a complete shape and high consistency of the surface density. It avoids subsequent cutting waste and significantly improves the utilization rate of the electrode sheet material. It is applicable to double-sided coating production. Description of the drawings

[0034] Figure 1 is a schematic structural diagram of the present invention;

[0035] Description of the reference numerals: 1. Upper cavity feed port; 2. Lower cavity feed port; 3. Upper layer intermediate coating discharge port; 4. Lower layer continuous coating discharge port; 5. Upper cavity pressure sensor; 6. Lower cavity pressure sensor; 7. Micrometer for surface density adjustment. Detailed implementation manners

[0036] This part will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0038] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two. Understanding such as "greater than", "less than", "exceeding", etc. does not include the base number, and understanding such as "above", "below", "within", etc. includes the base number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, words such as "set", "install", "connect", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0040] Embodiment 1

[0041] Reference Figure 1 , a coating system for special-shaped laminates, comprising:

[0042] A double-layer coating die head, the double-layer coating die head having an independently controlled upper cavity and a lower cavity;

[0043] A first feeding mechanism, the first feeding mechanism is arranged on the upper cavity of the double-layer coating die head and supplies slurry to the upper cavity of the double-layer coating die head through the first feeding mechanism to perform gap coating on the substrate to form an "L"-shaped "-" region;

[0044] A second feeding mechanism, the second feeding mechanism is arranged on the lower cavity of the double-layer coating die head and supplies slurry to the lower cavity of the double-layer coating die head through the second feeding mechanism to perform continuous coating on the substrate to form an "L"-shaped "|" region;

[0045] Wherein, the "-" region and the "|" region together form a complete "L"-shaped coating region.

[0046] Preferably, the double-layer coating die head is further provided with an upper cavity feed port 1 and a lower cavity feed port 2;

[0047] The upper cavity feed port 1 is located on the upper cavity of the double-layer coating die head and is connected to the first feeding mechanism for introducing the slurry into the internal flow channel of the upper cavity;

[0048] The lower cavity feed port 2 is located on the lower cavity of the double-layer coating die head and is connected to the second feeding mechanism, and is used for introducing the slurry into the internal flow channel of the lower cavity.

[0049] Preferably, two independent discharge slits are further provided on the discharge surface of the double-layer coating die head: the upper interlayer coating discharge port 3 and the lower continuous coating discharge port 4;

[0050] The upper interlayer coating discharge port 3 is communicated with the flow channel of the upper cavity and is used for intermittently coating the slurry on the substrate to form the horizontal "-" area of the L-shaped coating; the lower continuous coating discharge port 4 is communicated with the flow channel of the lower cavity and is used for continuously coating the slurry on the substrate to form the vertical "|" area of the L-shaped coating;

[0051] Among them, the upper interlayer coating discharge port 3 and the lower continuous coating discharge port 4 are arranged at a specific angle in space and cooperate together to output a complete "L" - shaped coating.

[0052] Preferably, the upper interlayer coating discharge port 3 and the lower continuous coating discharge port 4 are both provided with a surface density adjusting micrometer 7 for precisely adjusting the slit gap.

[0053] Preferably, an upper cavity pressure sensor 5 is arranged in the flow channel of the upper cavity of the double-layer coating die head for real-time monitoring of the extrusion pressure of the slurry in the upper cavity;

[0054] A lower cavity pressure sensor 6 is arranged in the flow channel of the lower cavity of the double-layer coating die head for independently and real-time monitoring of the extrusion pressure of the slurry in the lower cavity.

[0055] Preferably, both the first feeding mechanism and the second feeding mechanism adopt an electric cylinder valve group to control the flow rate and on-off of supplying the slurry to the upper cavity and the lower cavity.

[0056] Preferably, it further includes a control unit for independently controlling the coating actions of the upper cavity and the lower cavity. The control unit is respectively connected to the upper cavity pressure sensor 5, the lower cavity pressure sensor 6 and the electric cylinder valve group.

[0057] In this embodiment, the bus bar height of the double-layer coating die head is 115 - 130 mm; preferably, the bus bar height of the double-layer coating die head is 0.1 - 0.6 mm higher than that of the steel rod, ensuring that the coating shape is complete, the surface density consistency and the dimensional ability meet the product requirements.

[0058] In this embodiment, the tolerance of the surface density adjusting micrometer to the horizontal surface density is ±5 mg / 1540.25 mm 2 .

[0059] In this embodiment, the double-layer coating die head needs to be equipped with two sets of special production gaskets. The opening width of the gaskets is designed according to the cell size. Among them, the upper interlayer coating and the lower continuous coating need to have a superposition area of 0.3 - 0.8 mm to ensure that the thickness of the coating connection area is neither too high nor too low.

[0060] Example 2

[0061] A coating process for irregularly shaped laminates is described in this embodiment, which utilizes the irregularly shaped coating system described in Example 1.

[0062] A coating process for irregularly shaped laminates, the coating process comprising:

[0063] S1: Adjust the coating PLC program parameters to enable independent control of the upper and lower cavities of the double-layer coating, and to enable intermittent coating in the upper cavity and continuous coating in the lower cavity.

[0064] S2: The slurry is introduced into the internal channels of the upper cavity and the lower cavity respectively;

[0065] S3: First, perform single-sided coating. After single-sided coating is completed, adjust the starting fiber of double-sided coating and align it with the single-sided size control position of the inter-coating area.

[0066] S4: Detect the coating width and adjust it using the lateral closed-loop function of the die head;

[0067] S5: Adjust the head and tail size misalignment parameters of the coating area in the continuous coating position;

[0068] S5: Perform double-sided coating.

[0069] Example 3

[0070] An irregularly shaped laminate was prepared using the coating process described in Example 2.

[0071] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A coating system for irregularly shaped laminates, characterized in that, Comprising: A double-layer coating die head, which has an independently controlled upper cavity and a lower cavity; A first feeding mechanism, which is arranged on the upper cavity of the double-layer coating die head and supplies slurry to the upper cavity of the double-layer coating die head through the first feeding mechanism to perform gap coating on a substrate to form an "L"-shaped "one" region; A second feeding mechanism, which is arranged on the lower cavity of the double-layer coating die head and supplies slurry to the lower cavity of the double-layer coating die head through the second feeding mechanism to perform continuous coating on the substrate to form an "L"-shaped "vertical bar" region; Wherein, the "one" region and the "vertical bar" region jointly form a complete L-shaped coating region.

2. The coating system for irregularly shaped laminates according to claim 1, characterized in that, The double-layer coating die head is further provided with an upper cavity feed port and a lower cavity feed port; The upper cavity feed port is located on the upper cavity of the double-layer coating die head and is connected to the first feeding mechanism for introducing slurry into the internal flow channel of the upper cavity; The lower cavity feed port is located on the lower cavity of the double-layer coating die head and is connected to the second feeding mechanism for introducing slurry into the internal flow channel of the lower cavity.

3. The coating system for irregularly shaped laminates according to claim 2, characterized in that, Two independent discharge slits are further provided on the discharge surface of the double-layer coating die head: an upper interlayer coating discharge port and a lower continuous coating discharge port; The upper interlayer coating discharge port is communicated with the flow channel of the upper cavity for intermittently coating slurry on the substrate to form a horizontal "one" region of the L-shaped coating; the lower continuous coating discharge port is communicated with the flow channel of the lower cavity for continuously coating slurry on the substrate to form a vertical "vertical bar" region of the L-shaped coating; Wherein, the upper interlayer coating discharge port and the lower continuous coating discharge port are arranged at a specific angle in space and cooperate with each other to output a complete "L"-shaped coating.

4. The coating system for irregularly shaped laminates according to claim 3, characterized in that, Both the upper interlayer coating discharge port and the lower continuous coating discharge port are provided with surface density adjustment micrometers for precisely adjusting the slit gap.

5. The coating system for irregularly shaped laminates according to claim 4, characterized in that, An upper cavity pressure sensor is arranged in the flow channel of the upper cavity of the double-layer coating die head for real-time monitoring of the extrusion pressure of the slurry in the upper cavity; A lower cavity pressure sensor is arranged in the flow channel of the lower cavity of the double-layer coating die head for independently and real-time monitoring of the extrusion pressure of the slurry in the lower cavity.

6. The coating system for irregularly shaped laminates according to claim 5, characterized in that, Both the first feeding mechanism and the second feeding mechanism adopt an electric cylinder valve group to control the flow rate and on / off of the slurry supplied to the upper cavity and the lower cavity.

7. The coating system for irregularly shaped laminates according to claim 6, characterized in that, It further includes a control unit for independently controlling the coating actions of the upper cavity and the lower cavity, and the control unit is respectively connected to the upper cavity pressure sensor, the lower cavity pressure sensor and the electric cylinder valve group.

8. A coating process for irregularly shaped laminates, characterized in that, Coating is performed by using the special-shaped coating system according to any one of claims 1-7.

9. The coating process for irregularly shaped laminates according to claim 8, characterized in that, The coating process includes: S1: Adjust the parameters of the coating PLC program to independently control the upper and lower cavities of the double-layer coating, and make the upper cavity perform gap coating and the lower cavity perform continuous coating; S2: Introduce the slurry into the internal flow channels of the upper cavity and the lower cavity respectively; S3: First perform single-sided coating. After the single-sided coating is completed, adjust the start coating optical fiber of the double-sided coating to align with the single-sided size control position of the interlayer coating region; S4: Detect the coating width and use the die head transverse closed-loop function for adjustment; S5: Adjust the head and tail size misalignment parameters of the coating area in the continuous coating position; S5: Perform double-sided coating.

10. A type of irregularly shaped laminate, characterized in that, It is prepared using the coating process described in any one of claims 8-9.

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