A slurry buffer chamber and a coating die head

Abstract

This utility model belongs to the field of lithium battery technology and discloses a slurry buffer chamber and a coating die head, including a cavity. The cavity contains a buffer chamber and an output chamber that are connected to each other. The buffer chamber is connected to a feeding structure, and the output chamber is connected to a discharging structure. The output chamber is narrow at both ends and wide in the middle. The buffer chamber can temporarily store a certain amount of slurry, playing a role in buffering and stabilizing the slurry supply for subsequent processing. The output chamber's narrow-at-both-ends and wide-in-the-middle shape allows the slurry to form a specific distribution within the secondary cavity during slurry flow, which may help with the rational distribution of slurry at different positions during subsequent processing. The slurry flows into the discharging structure through the output chamber.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery technology, specifically a slurry buffer cavity and a coating die. Background Technology

[0002] The uniformity of coating surface density determines the battery capacity. If the coating surface density is too small, the battery capacity may not reach the nominal capacity. If the coating surface density is too large, it is easy to waste materials. In severe cases, if the positive electrode capacity is excessive, lithium dendrites will form due to lithium precipitation, piercing the battery separator and causing a short circuit, which will lead to safety hazards. Whether the lateral distribution of surface density is balanced, that is, the lateral uniformity, is a key parameter of the coating process. One of the most important factors affecting lateral uniformity is the stability of the die head's discharge pressure. The discharge pressure is inseparable from the design of the die head's internal cavity. Conventional die head cavities are single-cavity or double-cavity structures. However, single-cavity and double-cavity structures can only maintain pressure stability when the slurry viscosity fluctuates little. When the viscosity fluctuates greatly, it is not possible to guarantee the lateral uniformity of the coating surface density.

[0003] The invention patent application with application number CN202210291144.1 provides a coating head including a first die head and a second die head. The first die head has a liquid supply hole for connecting to a liquid supply device. The second die head is an integrally formed structure with a liquid outlet groove. The inlet end of the liquid outlet groove is connected to the liquid supply hole, and its outlet end is connected to the outside. This coating head, by molding the liquid outlet groove onto the second die head, eliminates the need to consider the installation and positioning accuracy of the first and second dies, facilitating installation and reducing processing costs. Furthermore, the second die head can be made of hard alloy or other wear-resistant materials independently, eliminating the need for the entire coating head to be made of wear-resistant materials. When the liquid outlet groove wears down, only the second die head needs to be replaced, without replacing the first die head. However, it still cannot guarantee the lateral consistency of the coating surface density. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model provides a slurry buffer chamber and a coating die head, which improves the stability of the die head feeding pressure and enhances the consistency of the transverse density of the coating surface.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A slurry buffer chamber includes a cavity body, in which a buffer chamber and an output chamber are disposed and communicate with each other. The buffer chamber is connected to a feeding structure, and the output chamber is connected to a discharging structure. The output chamber is narrow at both ends and wide in the middle.

[0007] The technical effect achieved by the above solution is as follows: the slurry is buffered by the buffer chamber and the slurry is output by the output chamber, thereby reducing the feeding pressure of the die head.

[0008] Furthermore, the buffer chamber is provided in multiple ways, and all buffer chambers are connected in sequence. The feeding structure is connected to the buffer chamber located at the beginning end, and the buffer chamber located at the end end is connected to the output chamber.

[0009] The technical effect achieved by the above solution is that by setting up multiple buffer chambers, multiple buffers are formed for the slurry, further reducing slurry fluctuations.

[0010] Furthermore, the cavity includes a lower mold and an upper mold that covers the top of the lower mold. A buffer cavity and an output cavity are located in the lower mold. The top of the buffer cavity and the output cavity are provided with openings, which are covered by the upper mold.

[0011] The technical effect achieved by the above solution is that by setting the cavity as an upper and lower mold opening and closing structure, it is convenient to open the upper mold to clean the buffer cavity and the output cavity.

[0012] Furthermore, the discharge structure includes an inclined chute and an extrusion slit, the inclined chute being connected to the output cavity and the extrusion slit being connected to the inclined chute.

[0013] The technical effect achieved by the above solution is that the slurry in the secondary cavity is introduced into the extrusion joint through the inclined groove, and the extrusion joint compresses the slurry, so that the slurry has a uniform density.

[0014] Furthermore, the sloping groove and extrusion slit are located in the lower mold, and the top of the sloping groove and extrusion slit are covered by the upper mold.

[0015] The technical effect achieved by the above solution is that, similarly, the upper mold can be opened to clean the inclined groove and extrusion seam.

[0016] Furthermore, a gasket is provided between the upper mold and the lower mold.

[0017] The technical effect achieved by the above solution is to improve the sealing performance between the upper and lower molds.

[0018] Furthermore, the lower mold and the upper mold are rotatably connected and equipped with a drive motor to realize electric opening and closing.

[0019] The technical effects achieved by the above solution are: it makes it easy for the upper and lower molds to be flipped and opened and closed, and it is driven by a drive motor, which facilitates automated control.

[0020] Furthermore, baffles are provided at both ends of the lower mold.

[0021] The technical effect achieved by the above solution is to improve the sealing performance of the cavity.

[0022] Furthermore, the feeding structure is a feeding pipe, which is connected to a control valve.

[0023] The technical effect achieved by the above solution is that it facilitates automated control of the feeding process.

[0024] The second aspect of this utility model provides a coating die head, wherein the coating die head is provided with the above-mentioned slurry buffer cavity structure.

[0025] The technical effects achieved by the above solution are as follows: applying the above slurry buffer cavity structure to the coating die head improves the stability of the die head feeding pressure and enhances the consistency of the transverse density of the coating surface.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] This invention, by setting up a buffer chamber, can temporarily store a certain amount of slurry, which plays a role in buffering and stabilizing the slurry supply in subsequent processing, and avoids excessive changes in slurry viscosity. The output chamber, due to its narrow ends and wide middle, has a special shape that allows the slurry to form a specific distribution in the secondary chamber during the slurry flow process. This may help to rationally distribute the slurry at different positions in subsequent processing and improve the lateral consistency of the coating surface density. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall disassembled structure of this utility model;

[0030] Figure 3 This is a magnified view of point A in diagram 2;

[0031] Figure 4 This is a schematic diagram of the tangent structure of this utility model;

[0032] Figure 5 This is a cross-sectional structural diagram of the present invention.

[0033] In the diagram: 1. Lower mold; 101. Inclined groove; 102. Extrusion seam; 2. First buffer chamber; 3. Second buffer chamber; 4. Output chamber; 5. Feed pipe; 51. Control valve; 6. Tilting mechanism; 61. Base; 611. Bracket; 612. Drive motor; 62. Rotating rod; 63. Clamping block; 64. Transmission rod; 7. Upper mold; 8. Gasket; 9. Baffle. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0035] like Figures 1 to 5 As shown, this embodiment provides a slurry buffer cavity structure, including a lower mold 1. The lower mold 1 has a series of interconnected output cavities 4 and multiple buffer cavities. In this embodiment, there are two buffer cavities: a first buffer cavity 2 and a second buffer cavity 3. A feed pipe 5 is connected to one side of the lower mold 1. An upper mold 7 is located on the top of the lower mold 1. A gasket 8 is placed between the upper mold 7 and the lower mold 1. A sloping groove 101 and an extrusion slit 102 are respectively provided on the top surface of the lower mold 1. The first buffer cavity 2 and the second buffer cavity 3 have the same shape. The output cavity 4 is narrow at both ends and wide in the middle. The output end of the feed pipe 5 is connected to the input end of the first buffer cavity 2. A control valve 51 is provided on the feed pipe 5.

[0036] The above scheme is adopted: the slurry enters the first buffer chamber 2 through the feed pipe 5. Since the output end of the feed pipe 5 is connected to the input end of the first buffer chamber 2, the slurry can flow smoothly into the first buffer chamber 2. The first buffer chamber 2 and the second buffer chamber 3 are the main buffer chambers with the same shape. They can temporarily store a certain amount of slurry, which plays a role in buffering and stabilizing the slurry supply for subsequent processing. The output chamber 4 is narrow at both ends and wide in the middle. This special shape can make the slurry form a specific distribution in the output chamber 4 during the slurry flow process, which may help the reasonable distribution of slurry at different positions in subsequent processing. The slurry flows into the inclined groove 101 through the output chamber 4 and then flows out through the extrusion slit 102. A buffer chamber is added to the double-chamber structure, adopting a three-chamber structure. The two internal chambers are buffer chambers. After being buffered by the two chambers, the pressure of the slurry remains relatively stable when it flows out of the die lip after passing through the output chamber 4. This can effectively solve the problem of die head discharge pressure stability when the slurry viscosity changes too much and improve the lateral consistency of surface density.

[0037] A flipping mechanism 6 is provided in the middle of one side of the lower mold 1; the flipping mechanism 6 includes a base 61, a rotating rod 62, a locking block 63 and a transmission rod 64. Both ends of the rotating rod 62 are rotatably connected to the base 61. The rotating rod 62 is located inside the locking block 63. One end of the transmission rod 64 is connected to one end of the rotating rod 62.

[0038] The above scheme is adopted: the base 61 provides stable support and rotation connection point for the rotating rod 62. Its two sides are connected to the lower mold 1 through fixed plates to ensure the stability of the entire flipping mechanism 6 during operation and prevent the mechanism from loosening or displacing due to vibration or other external forces. The rotating rod 62 is the core transmission component of the flipping mechanism 6. One end is splined connected to the drive motor 612 to receive the power of the motor, and the other end is connected to the locking block 63. By rotating, the locking block 63 is driven to move, realizing the flipping function of the upper mold 7. The spline connection can ensure the reliability and stability of power transmission, while allowing a certain degree of axial displacement to adapt to small changes during operation. The locking block 63 connects the rotating rod 62 and the upper mold 7, transmitting the rotational motion of the rotating rod 62 to the upper mold 7, enabling the upper mold 7 to achieve flipping at a specific angle. Its connection with the upper mold 7 ensures the effective transmission of force, and at the same time, it can adapt to the motion characteristics of the mold during rotation, reducing wear and jamming.

[0039] like Figures 1 to 5 As shown, both sides of the base 61 are connected to the lower mold 1 via fixing plates. A bracket 611 is fixedly installed on one side of the base 61. A drive motor 612 is fixedly installed on the top of the bracket 611. The output end of the drive motor 612 is splinedly connected to the other end of the rotating rod 62. One end of the locking block 63 is rotatably connected to the base 61 via the rotating rod 62. One side of the locking block 63 is connected to one side of the upper mold 7. An adjuster is installed on the top of the upper mold 7. Both ends of the lower mold 1 are fixedly installed with baffles 9 via stabilizing plates.

[0040] The above scheme is adopted: the upper mold 7 and the lower mold 1 work together to complete the product molding process. The top adjuster can adjust the overall parameters of the mold. The gasket 8 is located between the upper mold 7 and the lower mold 1, which plays the role of sealing and adjusting the gap. The sealing function can prevent the slurry from leaking from the mold gap under high pressure, avoiding slurry waste and pollution of the production environment. The baffle 9 is installed at both ends of the lower mold 1 and fixed by the stabilizing plate. During the production process, the baffle 9 can prevent the slurry from overflowing from the side of the mold, ensuring that the slurry flows and forms inside the mold according to the designed path. It can maintain the pressure stability in the mold cavity and ensure that the molding quality of the product is uniform and consistent throughout the width direction. It plays an important role in improving the dimensional accuracy and appearance quality of the product. Example 2

[0041] This embodiment provides a coating die head with a slurry buffer cavity structure based on the above embodiments. The working process of the coating die head is as follows: check whether each component of the slurry buffer cavity structure is installed correctly and securely, including checking whether the gasket 8 between the upper mold 7 and the lower mold 1 is placed in place, whether the control valve 51 on the feed pipe 5 can work normally, whether the drive motor 612 is running normally, and whether the regulator and baffle 9 are installed securely, etc., and confirm that other related production systems connected to the equipment are in a ready state, such as the slurry supply system being properly connected to the feed pipe 5 of the die head.

[0042] The flipping mechanism 6 remains locked, and the control valve 51 on the feed pipe 5 is opened. The slurry enters the first buffer chamber 2 through the feed pipe 5. Since the output end of the feed pipe 5 is connected to the input end of the first buffer chamber 2, the slurry can flow smoothly into the first buffer chamber 2. The first buffer chamber 2 and the second buffer chamber 3 are the main buffer chambers and have the same shape. They can temporarily store a certain amount of slurry, which plays a role in buffering and stabilizing the slurry supply for subsequent processing. The output chamber 4 is narrow at both ends and wide in the middle. This special shape can make the slurry form a specific distribution in the output chamber 4 during the slurry flow process, which may help the reasonable distribution of slurry at different positions in subsequent processing. The slurry flows into the inclined groove 101 through the output chamber 4 and then flows out through the extrusion slit 102. The die head performs the coating operation.

[0043] After coating is completed, the drive motor 612 is started. The output end of the drive motor 612 is splinedly connected to the rotating rod 62. The motor drives the rotating rod 62 to rotate. Both ends of the rotating rod 62 are rotatably connected to the base 61. The rotating rod 62 is located inside the locking block 63. When the rotating rod 62 rotates, it drives the locking block 63 to move. One end of the locking block 63 is rotatably connected to the base 61 through the rotating rod 62, and the other end is connected to one side of the upper mold 7, thereby realizing the flipping action of one side of the upper mold 7. The upper mold 7 is opened, and the first buffer cavity 2, the second buffer cavity 3, and the output cavity 4 of the lower mold 1 are cleaned.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A slurry buffer chamber, characterized by: Includes a cavity, in which a buffer cavity and an output cavity (4) are connected. The buffer cavity is connected to a feeding structure, and the output cavity (4) is connected to a discharging structure. The output cavity (4) is narrow at both ends and wide in the middle.

2. The slurry buffer chamber of claim 1, wherein: The buffer chamber is provided in multiple ways, and all the buffer chambers are connected in sequence. The feeding structure is connected to the buffer chamber at the beginning and the buffer chamber at the end is connected to the output chamber (4).

3. The slurry buffer chamber of claim 1, wherein: The cavity includes a lower mold (1) and an upper mold (7) that covers the top of the lower mold (1). A buffer cavity and an output cavity (4) are located in the lower mold (1). The top of the buffer cavity and the output cavity (4) are provided with openings, which are covered by the upper mold (1).

4. The slurry buffer chamber of claim 3, wherein: The discharge structure includes a chute (101) and an extrusion slit (102). The chute (101) is connected to the output cavity (4), and the extrusion slit (102) is connected to the chute (101).

5. The slurry buffer chamber of claim 4, wherein: The inclined groove (101) and the extrusion slit (102) are provided on the lower mold (1), and the top of the inclined groove (101) and the extrusion slit (102) are covered by the upper mold (1).

6. The slurry buffer chamber of claim 3, wherein: A gasket (8) is provided between the upper mold (7) and the lower mold (1).

7. The slurry buffer chamber of claim 3, wherein: The lower mold (1) and the upper mold (7) are rotatably connected and are equipped with a drive motor to realize electric opening and closing.

8. The slurry buffer chamber according to claim 3, characterized in that: Both ends of the lower mold (1) are provided with baffles (9).

9. The slurry buffer cavity of claim 1, wherein: The feeding structure is a feeding pipe (5), and the feeding pipe (5) is connected to a control valve (51).

10. A coating die characterized by, The coating die head is provided with a slurry buffer cavity as described in any one of claims 1 to 9.

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