Slurry feeding structure of intermittent valve of coating machine

Abstract

The utility model relates to the field of lithium ion battery manufacturing, in particular to a slurry feeding structure of an intermittent valve of a coating machine, which is characterized in that a slurry inlet is arranged on a valve seat, a bonnet is arranged at the position corresponding to the slurry inlet, the bonnet is in a prismatic table shape with the upper end face smaller than the lower end face, and the bonnet is arranged on a valve rod and connected with a controller through the valve rod. When the controller drives the bonnet to move upwards through the valve rod, the first matching end face located on the side end face of the bonnet is matched with the slurry inlet to close the slurry inlet, and when the controller drives the bonnet to move downwards through the valve rod, the slurry inlet is opened. According to the utility model, the area of the top end of the bonnet is smaller, so that the instantaneous pressure of slurry entering the die head through the slurry inlet cannot be increased when coating is started, the consistency of the surface density of a pole piece during coating is improved, the thickness of the head part is reduced, and the risk of material falling caused by rolling in the coating process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery manufacturing, specifically to a slurry feeding structure for an intermittent valve of a coating machine. Background Technology

[0002] Lithium-ion batteries are widely used in people's daily lives. High energy density, stable performance and high safety factor lithium-ion batteries are more popular. The stability and continuity of their manufacturing process have a great impact on the performance of the battery. During the intermittent coating process of the electrode, the intermittent valve is indispensable.

[0003] The current slurry feed structure in intermittent valves is as follows: Figure 4 As shown, the valve cap 21 of the intermittent valve has a structure that is wider at the top and narrower at the bottom. When the valve stem 22 moves upward, the valve seat 23 is in the coating state. Because the top area of ​​the valve cap 21 is large, the upward movement of the valve stem 22 will cause the slurry to enter the valve seat 23 with a large instantaneous pressure, resulting in a thicker coating head, which affects the uniformity of the electrode surface density and increases the risk of material falling off during rolling. When the valve stem 22 moves downward, the slurry stops.

[0004] To address the problems existing in current intermittent valves, this utility model provides a slurry feeding structure for an intermittent valve of a coating machine. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a slurry feeding structure for an intermittent valve of a coating machine, which can reduce the coating start pressure, reduce the coating head thickness, improve the consistency of coating surface density, and reduce the risk of material falling off due to rolling during coating.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a slurry inlet structure for an intermittent valve of a coating machine, including a valve seat and a valve cap. The valve seat has a slurry inlet, and the valve cap is located at the slurry inlet. The valve cap is a frustum-shaped structure with an upper end face smaller than its lower end face. The side end face of the valve cap is a first mating end face, which mates with the slurry inlet. The valve cap and valve stem are located at the slurry inlet of the valve seat. The valve cap has a structure that is narrower at the top and wider at the bottom to fit with the slurry inlet. When the valve cap is in the downward-facing coating state, because the top area of ​​the valve cap is small, the instantaneous pressure of the slurry entering the slurry inlet will not increase during coating, thus reducing the head thickness, improving the consistency of the electrode surface density, and reducing the risk of material falling off due to crushing.

[0007] As an optional solution, the valve seat is provided with a second mating end face at the slurry inlet, which is suitable for mating with the first mating end face.

[0008] As an optional solution, the valve cap is mounted on the valve stem, and the valve stem is provided with a controller connection part.

[0009] As an optional solution, the controller connection part is a pin hole.

[0010] As an optional solution, the valve stem is a stepped shaft with a diameter in the middle larger than that at both ends, the valve cap is located at the top of the valve stem, and the controller connection part is located at the bottom of the valve stem.

[0011] Compared with the prior art, the present invention has the following advantages: The slurry feeding structure of the present invention has a valve cap located at the slurry inlet of the valve seat. The valve cap is a truncated pyramid structure that is narrow at the top and wide at the bottom, which is suitable for cooperating with the slurry inlet. When the valve cap moves upward and cooperates with the slurry inlet, the slurry inlet is closed. When the valve cap moves downward, the slurry inlet can be opened. Moreover, since the top area of ​​the valve cap is small, the upward movement of the valve cap will not increase the instantaneous pressure of the slurry entering the slurry inlet and flowing into the die head, thereby improving the consistency of the electrode surface density during coating and reducing the thickness of the coating head, thus reducing the risk of material crushing and falling off during the coating process. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A schematic diagram of the valve stem and valve cap;

[0014] Figure 2 This is a schematic diagram showing the fit between the valve cap and the slurry inlet.

[0015] Figure 3 A comparison diagram showing the thickness of the electrode head when using the slurry inlet structure of this application for coating and when using the slurry inlet structure of the prior art for coating;

[0016] Figure 4 This is a structural diagram of the existing slurry feed structure;

[0017] In the figure: 1. Valve seat, 2. Slurry inlet, 3. Valve cap, 4. First mating end face, 5. Second mating end face, 6. Valve stem, 7. Controller connection part, 21. Valve cap, 22. Valve stem, 23. Valve seat. Detailed Implementation

[0018] 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

[0019] A slurry inlet structure for an intermittent valve of a coating machine, such as Figure 2 As shown, the valve includes a valve seat 1 and a valve cap 3. The valve seat 1 has a slurry inlet 2, and the intermittent valve has a valve cap 3 installed at the slurry inlet 2 of the valve seat 1. Figure 2 Using the indicated direction as a reference, valve cap 3 is located below the slurry inlet 2. Valve cap 3 is a frustum-shaped structure with its upper end face smaller than its lower end face. The side end face of valve cap 3 is the first mating end face 4. The upper end face of valve cap 3 is smaller than the size of slurry inlet 2, and the lower end face of valve cap 3 is larger than the size of slurry inlet 2. Valve cap 3 can partially extend into slurry inlet 2, allowing the first mating end face 4 to mate with slurry inlet 2. When valve cap 3 moves upward and extends into slurry inlet 2, the first mating end face 4 mates with slurry inlet 2 and closes slurry inlet 2. When valve cap 3 moves downward, slurry inlet 2 opens.

[0020] In a further embodiment, a second mating end face 5 is provided on the valve seat 1 at the slurry inlet 2. When the valve cap 3 closes the slurry inlet 2, the first mating end face 4 of the valve cap 3 abuts against and fits against the second mating end face 5, thereby closing the slurry inlet 2.

[0021] Please see Figure 1 and Figure 2 It also includes a valve stem 6, which is a stepped shaft with a middle diameter larger than the diameters at both ends. A valve cap 3 is located at the top of the valve stem 6, and a controller connection part 7 is located at the bottom of the valve stem 6. The valve stem 6 can be connected to a controller through the controller connection part 7, and the controller can control the opening and closing state of the slurry inlet 2. As a preferred example, the controller is a cylinder controlled by a PLC. The PLC controls the extension and retraction state of the cylinder by controlling the solenoid valve of the cylinder, thereby driving the valve cap 3 to move. The controller connection part 7 is preferably a pin hole suitable for connecting with the cylinder.

[0022] Figure 4 This is a comparison diagram showing the change in electrode head thickness when using the slurry inlet structure of this application for coating and the change in electrode head thickness when using the control group slurry inlet structure. The control group uses the slurry inlet structure described in the background art. Figure 4 It can be clearly seen that when the slurry feeding structure of this application is used for coating, the thickness curve of the electrode head is more stable and the thickness consistency is higher.

[0023] In this specification, the terms "an embodiment," "example," "specific example," 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 the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A slurry inlet structure for an intermittent valve of a coating machine, comprising a valve seat (1) and a valve cap (3), wherein the valve seat (1) is provided with a slurry inlet (2), characterized in that: A valve cap (3) is provided at the slurry inlet (2). The valve cap (3) is a frustum-shaped structure with the upper end face smaller than the lower end face. The side end face of the valve cap (3) is the first mating end face (4), which mates with the slurry inlet (2).

2. The slurry feeding structure of the intermittent valve of a coating machine according to claim 1, characterized in that: The valve seat (1) is provided with a second mating end face (5) at the slurry inlet (2) which is suitable for mating with the first mating end face (4).

3. The slurry feeding structure of the intermittent valve of a coating machine according to claim 2, characterized in that: The valve cap (3) is set on the valve stem (6), and the valve stem (6) is provided with a controller connection part (7).

4. The slurry feeding structure of the intermittent valve of a coating machine according to claim 3, characterized in that: The controller connection part (7) is a pin hole.

5. The slurry feeding structure of an intermittent valve for a coating machine according to claim 3, characterized in that: The valve stem (6) is a stepped shaft with a middle diameter larger than the diameters at both ends. The valve cap (3) is located at the top of the valve stem (6), and the controller connection part (7) is located at the bottom of the valve stem (6).

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