Lithium battery negative pressure formation suction nozzle

Abstract

The utility model discloses a lithium battery negative pressure formation suction nozzle which comprises an elastic suction nozzle body, the center of the suction nozzle body is provided with an air suction channel penetrating through the top and the bottom of the suction nozzle body, the bottom of the suction nozzle body is provided with a contact part in sealed contact with a lithium battery liquid injection opening, and the contact part comprises an outer annular convex part and an inner annular convex part. An annular groove is formed between the outer annular convex part and the inner annular convex part, the outer annular convex part is slightly lower than the inner annular convex part, and certain pressure is applied to the top of the suction nozzle body, so that the outer annular convex part and the inner annular convex part can be forced to form extrusion sealing on the periphery of a liquid injection opening of the lithium battery. According to the suction nozzle, the contact part adopts the double-annular contact surface of the outer annular convex part and the inner annular convex part, so that the contact area between the suction nozzle body and a liquid injection port of the lithium battery can be reduced, the adhered electrolyte is obviously reduced, and the influence of electrolyte crystallization on the sealing performance of the contact surface is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a negative pressure formation nozzle for lithium batteries. Background Art

[0002] During the formation of square aluminum-cased power lithium batteries, gases such as CO, H2, hydrofluoric acid, and olefins generated by chemical reactions within the charged aluminum-cased batteries need to be discharged under negative pressure. Conventional negative pressure nozzles have a flat contact surface, pressing against the liquid injection port to apply negative pressure. Due to the large contact surface, electrolyte easily adheres to the nozzle surface during production. Crystallization from this adhered electrolyte can degrade the sealing performance and lead to insufficient negative pressure. This necessitates frequent nozzle cleaning and, in severe cases, frequent nozzle replacement, severely impacting production efficiency and product quality. Utility Model Content

[0003] 1. Technical problems to be solved:

[0004] In view of the above technical problems, the utility model provides a negative pressure formation nozzle for lithium batteries.

[0005] 2. Technical solution:

[0006] A negative pressure forming nozzle for a lithium battery comprises an elastic nozzle body, an air suction channel penetrating the top and bottom of the nozzle body is provided at the center of the nozzle body, a contact portion for sealingly contacting the lithium battery filling port is provided at the bottom of the nozzle body, the contact portion comprises an outer annular convex portion and an inner annular convex portion, an annular groove is provided between the outer annular convex portion and the inner annular convex portion, the height of the outer annular convex portion is slightly lower than that of the inner annular convex portion, and applying a certain pressure on the top of the nozzle body can force the outer annular convex portion and the inner annular convex portion to form an extrusion seal around the lithium battery filling port.

[0007] Preferably, the end surfaces of the outer annular convex portion and the inner annular convex portion are both spherical surfaces.

[0008] Furthermore, the outer contour of the nozzle body is cylindrical, and the air intake channel includes a trumpet-shaped first through hole arranged on one side close to the inner annular protrusion, a connected cylindrical second through hole is provided above the first through hole, and a mounting hole is provided above the second through hole.

[0009] Furthermore, the inner diameter of the mounting hole is larger than that of the second through hole, and a trumpet-shaped introduction hole is provided at the top of the mounting hole.

[0010] Furthermore, a plurality of evenly distributed supporting bosses are provided on the inner wall of the first through hole, and the supporting bosses extend longitudinally toward the inner annular convex portion and do not extend to the outer surface of the inner annular convex portion.

[0011] Furthermore, the height difference between the ends of the outer annular convex portion and the inner annular convex portion is 3 mm.

[0012] Further, the outer side annular surface of the nozzle body is provided with an annular groove, which is arranged at a position close to the intersection of the first through hole and the second through hole.

[0013] Further, the nozzle body is made of ethylene-propylene-diene rubber material, and the Shore hardness requirement is HSA65±5.

[0014] 3. Beneficial effects:

[0015] (1) The contact part of the utility model adopts double-ring contact surfaces of outer annular convex part and inner annular convex part, which can reduce the contact area of the nozzle body and the liquid injection port of the lithium battery, significantly reduce the sticking electrolyte, thereby reducing the influence of electrolyte crystallization on the sealing performance of the contact surface; solve the equipment negative pressure alarm problem, reduce the cleaning frequency of the nozzle, improve the efficiency of the negative pressure formation equipment, and reduce the product failure rate.

[0016] (2) The contact part of the utility model has a small contact surface, which is easy to cause the inner wall of the trumpet-shaped first through hole to collapse inward when negative pressure is drawn, and the negative pressure nozzle collapses. Therefore, a plurality of supporting bosses are arranged, which effectively play the role of supporting and preventing collapse.

[0017] (3) The utility model is provided with a mounting hole with a guide hole at the top of the nozzle body, which is convenient for installation and replacement. DETAILED DESCRIPTION

[0018] Figure 1 It is a perspective view of the lithium battery negative pressure formation nozzle of the utility model;

[0019] Figure 2 It is a bottom view of the lithium battery negative pressure formation nozzle of the utility model;

[0020] Figure 3 It is a front view of the lithium battery negative pressure formation nozzle of the utility model. DETAILED DESCRIPTION

[0021] The utility model will be specifically described below in combination with the drawings.

[0022] As shown in the accompanying Figure 1 to the accompanying Figure 3 , as shown,

[0023] Specific embodiment: A negative pressure forming nozzle for lithium batteries, comprising an elastic nozzle body 1, an air suction channel running through the top and bottom of the nozzle body 1 is provided at the center of the nozzle body 1, a contact portion is provided at the bottom of the nozzle body 1 that is in sealed contact with the lithium battery filling port, the contact portion comprises an outer annular convex portion 2 and an inner annular convex portion 3, an annular groove 4 is provided between the outer annular convex portion 2 and the inner annular convex portion 3, the height of the outer annular convex portion 2 is slightly lower than that of the inner annular convex portion 3, and applying a certain pressure on the top of the nozzle body 1 can force the outer annular convex portion 2 and the inner annular convex portion 3 to form an extrusion seal around the lithium battery filling port.

[0024] The height of the outer annular protrusion 2 of the present invention is slightly lower than that of the inner annular protrusion 3. The reason for this design is that since the outer annular protrusion 2 is at the outermost side, due to the inherent characteristics of the elastic material, the amplitude of the extrusion deformation at this position will be larger than that of the inner annular protrusion 3. This ensures that when a certain pressure is applied to the top of the nozzle body 1, the outer annular protrusion 2 and the inner annular protrusion 3 can simultaneously form a double-layer extrusion seal around the lithium battery filling port, ensuring the sealing performance during negative pressure suction. In addition, compared with the contact surface of a planar structure, the annular groove 4 provided between the outer annular protrusion 2 and the inner annular protrusion 3 can effectively reduce the contact area, so that during negative pressure suction, less electrolyte adheres to the contact surface, reducing the impact of electrolyte crystallization on the sealing performance.

[0025] Preferably, the end surfaces of the outer annular convex portion 2 and the inner annular convex portion 3 are both spherical. The streamlined structure of the spherical surface can reduce the adhesion of the electrolyte on the surface, ensuring a smaller contact surface while making it easier for the attached electrolyte to drip, thereby further reducing the amount of adhesion and reducing the impact of electrolyte crystallization.

[0026] The outer contour of the nozzle body 1 is cylindrical, and the air intake channel includes a trumpet-shaped first through hole 5 arranged on the side close to the inner annular protrusion 3. The trumpet-shaped structure of the first through hole 5 can ensure that the end face completely covers the lithium battery filling port, and also retains more solid parts, ensuring the mechanical properties of the nozzle body 1 itself and minimizing the risk of negative pressure collapse. A second cylindrical through hole 6 is provided above the first through hole 5, and a mounting hole 7 is provided above the second through hole 6. The inner diameter of the mounting hole 7 is larger than that of the second through hole 6, and a trumpet-shaped guide hole 8 is provided at the top of the mounting hole 7 to facilitate the insertion of the negative pressure pipe joint into the mounting hole 7.

[0027] The embodiment is provided with a plurality of support bosses 9, which effectively play a supporting and anti-collapse role. The support bosses 9 are uniformly distributed on the inner wall of the first through hole 5, the support bosses 9 extend longitudinally towards the inner annular protruding part 3 side and do not extend to the outer surface of the inner annular protruding part 3. If the support bosses 9 extend to the inner annular protruding part 3, the inner annular protruding part 3 will not be easily extruded and deformed, which will affect the sealing performance.

[0028] Preferably, the height difference between the end portions of the outer annular protruding part 2 and the inner annular protruding part 3 is 3 mm. The design of the height difference is related to the material of the nozzle body 1 and the size of each part of the product, and will not be described in detail.

[0029] The outer annular surface of the nozzle body 1 is provided with an annular groove 10, which is arranged at a position close to the intersection of the first through hole 5 and the second through hole 6. The annular groove 10 can increase the extrusion deformation amount of the end portion where the bottom contact part is located, and the side end portion is more easily bent. Even if the contact part is not directly opposite the liquid injection port of the lithium battery at the beginning, the annular groove 10 can provide a certain amount of movement, which can ensure that the contact part is directly opposite the liquid injection port of the lithium battery after extrusion, thereby improving the sealing effect.

[0030] Preferably, the nozzle body 1 is made of ethylene-propylene-diene rubber material, and the Shore hardness requirement is HSA65±5.

[0031] Although the present application has been disclosed with reference to the preferred embodiments, they are not intended to limit the present application, and any person skilled in the art can make various changes or modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims of the present application.

Claims

1. A negative pressure formation nozzle for lithium batteries, characterized in that: The invention comprises an elastic suction nozzle body, wherein an air suction channel running through the top and bottom of the suction nozzle body is provided at the center of the suction nozzle body, and a contact portion which is in sealing contact with the lithium battery filling port is provided at the bottom of the suction nozzle body, and the contact portion comprises an outer annular convex portion and an inner annular convex portion, and an annular groove is provided between the outer annular convex portion and the inner annular convex portion, and the height of the outer annular convex portion is slightly lower than that of the inner annular convex portion. Applying a certain pressure on the top of the suction nozzle body can force the outer annular convex portion and the inner annular convex portion to form an extrusion seal around the lithium battery filling port.

2. A lithium battery negative pressure formation nozzle according to claim 1, characterized in that: The end surfaces of the outer annular convex portion and the inner annular convex portion are both spherical surfaces.

3. A negative pressure formation nozzle for lithium batteries according to claim 1 or 2, characterized in that: The outer contour of the nozzle body is cylindrical, and the air suction channel includes a trumpet-shaped first through hole arranged on one side close to the inner annular convex portion, a connected cylindrical second through hole is provided above the first through hole, and a mounting hole is provided above the second through hole.

4. A negative pressure formation nozzle for lithium batteries according to claim 3, characterized in that: The inner diameter of the mounting hole is larger than the second through hole, and a trumpet-shaped introduction hole is provided on the top of the mounting hole.

5. The negative pressure formation nozzle for lithium batteries according to claim 3, characterized in that: A plurality of evenly distributed supporting bosses are provided on the inner wall of the first through hole. The supporting bosses extend longitudinally toward the inner annular convex portion and do not extend to the outer surface of the inner annular convex portion.

6. The negative pressure formation nozzle for lithium batteries according to claim 1, characterized in that: The height difference between the ends of the outer annular convex portion and the inner annular convex portion is 3 mm.

7. The negative pressure formation nozzle for lithium batteries according to claim 3, characterized in that: An annular groove is provided on the outer annular surface of the nozzle body, and the annular groove is arranged near the intersection of the first through hole and the second through hole.

8. The negative pressure formation nozzle for lithium batteries according to claim 1, characterized in that: The nozzle body is made of EPDM rubber material, and the Shore hardness requirement is HSA65±5.

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