Negative pressure cup

Abstract

The utility model discloses a kind of negative pressure cups, comprising: cup body, the cup body has inner cavity, and at least two openings communicated with the inner cavity;Flow guide, the flow guide is distributed on the wall surface of the inner cavity of the cup body, the flow guide is protruded from the wall surface of the inner cavity of the cup body to the cup body inside. Through the above technical solution, the negative pressure cup disclosed in the present application is provided with protruding flow guide on the wall surface of the inner cavity of the cup body. The flow guide can guide the directional flow of liquid, reduce the contact area of liquid and cup body, thereby reducing the wall-hanging phenomenon, ensuring that the electrolyte can flow back into the battery cell.

Description

Technical Field

[0001] This utility model relates to the field of secondary battery manufacturing technology, specifically a negative pressure cup. Background Technology

[0002] During the formation process, a certain amount of gas is generated in the battery cell. In order to remove the generated gas in time, square aluminum shell battery cells generally adopt negative pressure formation, that is, a negative pressure degassing device is connected above the battery cell's liquid injection hole, and the gas generated during the battery cell formation is removed in time through high negative pressure.

[0003] Existing negative pressure degassing devices simply add a negative pressure buffer cup above the battery cell. A high vacuum is used to create a negative pressure inside the cell, facilitating the expulsion of gases generated during formation. However, this high vacuum also draws out the electrolyte from inside the cell, buffering it in the negative pressure cup above the cell. In traditional designs, the negative pressure cup is cylindrical, making it prone to electrolyte adhesion and crystallization, leading to deviations in the electrolyte filling accuracy of subsequently manufactured lithium batteries. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a negative pressure cup. The negative pressure cup has a raised guide fluid on the wall of the inner cavity of the cup. The guide fluid can guide the liquid to flow in a specific direction, reduce the contact area between the liquid and the cup body, thereby reducing the phenomenon of liquid sticking to the wall and ensuring that the electrolyte can flow back into the battery cell.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a negative pressure cup, comprising:

[0006] A cup body having an inner cavity and at least two openings communicating with the inner cavity;

[0007] A fluid guide is distributed on the wall surface of the inner cavity of the cup, and the fluid guide protrudes from the wall surface of the inner cavity of the cup into the cup.

[0008] Through the above technical solution, the negative pressure cup disclosed in this application has a protruding guide fluid on the wall surface of the inner cavity of the cup. The guide fluid can guide the liquid to flow in a specific direction, reduce the contact area between the liquid and the cup body, thereby reducing the phenomenon of sticking to the wall and ensuring that the electrolyte can flow back into the battery cell.

[0009] Furthermore, the fluid guide has a convex curved surface structure. The convex curved surface design promotes liquid flow separation by increasing the surface curvature and reduces the adsorption effect of capillary forces on the liquid; at the same time, it can disperse surface tension and prevent local liquid accumulation, thereby further reducing the risk of wall adhesion.

[0010] Furthermore, the bottom of the guide fluid is connected to the wall of the inner cavity of the cup, and the bottom of the guide fluid has a polygonal structure, with each guide fluid seamlessly covering the wall of the inner cavity of the cup. This application sets the bottom of the guide fluid to a polygonal structure, with adjacent guide fluids sharing a common edge, thereby completely covering the wall of the inner cavity of the cup.

[0011] Furthermore, the fluid guide protrudes 0.5mm to 1.5mm from the wall of the inner cavity of the cup. If the protrusion of the fluid guide from the wall of the inner cavity of the cup is less than 0.5mm, its guiding effect will be poor, and the electrolyte will not be able to flow back normally after the formation is completed, resulting in liquid loss; if the protrusion of the fluid guide from the wall of the inner cavity of the cup is greater than 1.5mm, it will lead to low utilization of the cup space.

[0012] Furthermore, the length of the guide fluid is 0.5mm to 1.5mm, and the width of the guide fluid is 0.5mm to 1.5mm.

[0013] Furthermore, the upper and lower ends of the cup body are respectively provided with openings, and return fluid is connected to the openings at the upper and lower ends of the cup body. The return fluid has a flow channel communicating with the inner cavity of the cup body. The return fluid has a first end and a second end, and the diameter of the flow channel of the return fluid decreases from the first end to the second end. The first end of the return fluid is connected to the opening of the cup body, and the second end of the return fluid has an inlet and outlet. With the above solution, during the cell formation process, in the vacuum breaking process, the inclined inner wall of the return fluid makes it easier for the liquid to flow back.

[0014] Furthermore, the cup body is a hollow cylinder, and the return fluid is a hollow cone. The cylindrical cup body and the conical return fluid facilitate processing and shaping.

[0015] Furthermore, the angle between the inner wall of the return fluid and the radial direction of the cup body is greater than or equal to 60°. A slope of 60° or more is more conducive to forming a stable fluid flow pattern.

[0016] Furthermore, the cup body, the fluid guide, and the fluid return are integrally molded.

[0017] Furthermore, the volume of the inner cavity of the cup is greater than or equal to 120ml.

[0018] Based on the above technical solution, the beneficial effects of this utility model are as follows:

[0019] 1. The negative pressure cup disclosed in this application has a raised guide fluid on the wall surface of the inner cavity of the cup. The guide fluid can guide the liquid to flow in a specific direction, reduce the contact area between the liquid and the cup body, thereby reducing the phenomenon of sticking to the wall and ensuring that the electrolyte can flow back into the battery cell.

[0020] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the negative pressure cup in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the cup body in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the fluid guide in an embodiment of this utility model;

[0025] Figure 4 This is a top view of the cup body in an embodiment of this utility model.

[0026] The reference numerals in the above figures are as follows: 1. Cup body; 11. Opening; 2. Fluid guide; 21. First side; 22. Second side; 3. Return fluid; 31. Inlet and outlet. Detailed Implementation

[0027] 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.

[0028] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] Example: This example discloses a negative pressure cup, comprising:

[0030] The cup body 1 has an inner cavity, and the upper and lower ends of the cup body 1 are respectively provided with openings 11 communicating with the inner cavity;

[0031] A guide fluid 2 is distributed on the wall surface of the inner cavity of the cup body 1, and the guide fluid 2 protrudes into the cup body 1 from the wall surface of the inner cavity of the cup body 1.

[0032] Through the above technical solution, the negative pressure cup disclosed in this application has a protruding guide fluid 2 on the inner wall of the cup body 1. The guide fluid 2 can guide the liquid to flow in a directional manner, reduce the contact area between the liquid and the cup body 1, thereby reducing the phenomenon of sticking to the wall and ensuring that the electrolyte can flow back into the battery cell.

[0033] In some feasible embodiments, such as Figure 2 As shown, the cup body 1 is a hollow cylinder. The fluid guide 2 is disposed on the inner wall of the cup body 1.

[0034] The fluid guide 2 has a convex curved surface structure. The convex curved surface design promotes liquid flow separation by increasing the surface curvature and reduces the adsorption effect of capillary forces on the liquid; at the same time, it can disperse surface tension and prevent local liquid accumulation, thereby further reducing the risk of wall adhesion.

[0035] The bottom of the fluid guide 2 is connected to the wall of the inner cavity of the cup body 1. The bottom of the fluid guide 2 has a polygonal structure, and each fluid guide 2 seamlessly covers the wall of the inner cavity of the cup body 1. In this application, the bottom of the fluid guide 2 is set as a polygonal structure, and two adjacent fluid guides 2 are arranged with a common side, thereby completely covering the wall of the inner cavity of the cup body 1.

[0036] In some feasible embodiments, such as Figure 3 As shown, the bottom of the fluid guide 2 is quadrilateral. (Combined with...) Figure 2 , 3 As shown in Figure 4, the two first sides 21 of the quadrilateral along the axial direction of the cup body 1 are straight lines, and the two second sides 22 of the quadrilateral along the circumferential direction of the cup body 1 are arcs. Adjacent fluid guides 2 share sides, thereby allowing the fluid guides 2 to seamlessly cover the inner wall of the cup body 1.

[0037] In some feasible embodiments, the fluid guide 2 is a hemisphere, which is easier to manufacture and process than a convex curved surface structure with a quadrilateral bottom.

[0038] In some feasible embodiments, the guide fluid protrudes 0.5 mm from the wall of the inner cavity of the cup, the length of the guide fluid is 0.5 mm, and the width of the guide fluid is 0.5 mm.

[0039] Optionally, the guide fluid protrudes 0.5mm to 1.5mm from the wall of the inner cavity of the cup, the length of the guide fluid is 0.5mm to 1.5mm, and the width of the guide fluid is 0.5mm to 1.5mm. If the protrusion of the guide fluid from the wall of the inner cavity of the cup is less than 0.5mm, or the length and width of the guide fluid are less than 0.5mm, the guiding effect of the guide fluid deteriorates, and the electrolyte cannot flow back normally after the formation is completed, resulting in liquid loss. If the protrusion of the guide fluid from the wall of the inner cavity of the cup is greater than 1.5mm, or the length and width of the guide fluid are greater than 1.5mm, it will lead to low utilization of the cup space.

[0040] A return fluid 3 is connected to the openings 11 at the upper and lower ends of the cup body 1, respectively. The return fluid 3 has a flow channel communicating with the inner cavity of the cup body 1. The return fluid 3 has a first end and a second end, with the diameter of the flow channel decreasing from the first end to the second end. The first end of the return fluid 3 is connected to the opening 11 of the cup body 1, and the second end of the return fluid 3 has an inlet / outlet 31. The inlet / outlet 31 of the two return fluids 3 are used for connecting to external pipes. With this design, during the cell formation process, the inclined inner wall of the return fluid 3 facilitates liquid return during the vacuum breaking process.

[0041] In some feasible embodiments, the return fluid 3 is a hollow cone. The cylindrical cup 1, combined with the conical return fluid 3, facilitates processing and molding. In some feasible embodiments, the cup 1, the guide fluid 2, and the return fluid 3 are integrally formed by injection molding.

[0042] The angle between the inner wall of the return fluid 3 and the radial direction of the cup body 1 is 75°.

[0043] In some feasible embodiments, the angle between the inner wall of the return fluid 3 and the radial direction of the cup body 1 is greater than or equal to 60°. A slope of 60° or more is more conducive to forming a stable liquid flow pattern, thereby making it easier for the electrolyte drawn into the negative pressure cup to flow back to the cell.

[0044] The inner cavity of the cup has a volume of 120ml. In conventional formation processes, a volume of 120ml is sufficient to hold the electrolyte extracted under negative pressure.

[0045] In some feasible embodiments, the volume of the inner cavity of the cup is greater than or equal to 120 ml.

[0046] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A negative pressure cup, characterized in that, include: A cup body having an inner cavity and at least two openings communicating with the inner cavity; A fluid guide is distributed on the wall surface of the inner cavity of the cup, and the fluid guide protrudes from the wall surface of the inner cavity of the cup into the cup.

2. The negative pressure cup as described in claim 1, characterized in that, The fluid guide has a convex curved surface structure.

3. The negative pressure cup as described in claim 2, characterized in that, The bottom of the guide fluid is connected to the wall of the inner cavity of the cup. The bottom of the guide fluid has a polygonal structure, and each guide fluid seamlessly covers the wall of the inner cavity of the cup.

4. The negative pressure cup as described in claim 1, characterized in that, The fluid guide protrudes 0.5mm to 1.5mm from the wall of the inner cavity of the cup.

5. The negative pressure cup as described in claim 4, characterized in that, The length of the guide fluid is 0.5mm to 1.5mm, and the width of the guide fluid is 0.5mm to 1.5mm.

6. The negative pressure cup as described in claim 1, characterized in that, The cup body has openings at its upper and lower ends, and return fluid is connected to the openings at the upper and lower ends of the cup body. The return fluid has a flow channel communicating with the inner cavity of the cup body. The return fluid has a first end and a second end, and the diameter of the flow channel of the return fluid decreases from the first end to the second end. The first end of the return fluid is connected to the opening of the cup body, and the second end of the return fluid has an inlet and outlet.

7. The negative pressure cup as described in claim 6, characterized in that, The cup body is a hollow cylinder, and the return fluid is a hollow cone.

8. The negative pressure cup as described in claim 6, characterized in that, The angle between the inner wall of the return fluid and the radial direction of the cup body is greater than or equal to 60°.

9. The negative pressure cup as described in claim 1, characterized in that, The cup body, the fluid guide, and the fluid return are integrally molded.

10. The negative pressure cup as described in claim 6, characterized in that, The volume of the inner cavity of the cup is greater than or equal to 120ml.

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