Battery liquid injection needle

Abstract

The utility model discloses a battery liquid injection needle which is characterized in that the battery liquid injection needle comprises a cylindrical sealing seat, the sealing seat is provided with a guide hole which is coaxially arranged in a penetrating mode, and a liquid injection pipe is arranged in the guide hole in a sliding and sealing mode in a penetrating mode; a sealing gasket which is coaxially arranged in a protruding mode is arranged on one side of the sealing seat, a limiting assembly is arranged on the liquid injection pipe, and the limiting assembly is located on the side, away from the sealing gasket, of the sealing seat; an elastic reset assembly is arranged between the limiting assembly and the sealing seat, so that the sealing seat can slide to the end part of the liquid injection pipe under the action of the elastic reset assembly. The utility model has the advantages that the structural design is ingenious, electrolyte attached to the surface of the needle head can be reduced, and the battery quality can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a battery injection needle. Background Art

[0002] Electrolyte is an essential material for preparing batteries. When producing batteries, electrolyte needs to be injected into the inside of the battery, and the filling needle is a key component in the filling equipment. The filling needle generally adopts a cylindrical needle, that is, the diameter of the infusion channel inside the needle is consistent at all places. When in use, the tail of the needle is connected to the hose for inputting electrolyte, and the head of the needle is inserted into the battery cell. The electrolyte flows from the tail of the needle to the infusion channel inside the needle, and finally outputs from the head of the needle to the inside of the battery. Since the needle needs to be inserted into the battery cell to add electrolyte, after the filling is completed, the electrolyte attached to the surface of the withdrawn needle will converge downward and drip. The electrolyte dripping to the battery filling port will affect the subsequent welding success rate of the sealing nail and affect the quality of the battery. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a battery filling needle with an ingenious structural design that can reduce the electrolyte attached to the needle surface and is conducive to ensuring the quality of the battery.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A battery filling needle, characterized in that it includes a cylindrical sealing seat, the sealing seat has a coaxially through-going guide hole, and a filling tube is slidably and sealingly passed through the guide hole; one side of the sealing seat has a coaxially protruding sealing gasket, and the filling tube is provided with a limiting component, and the limiting component is located on the side of the sealing seat away from the sealing gasket; an elastic reset component is provided between the limiting component and the sealing seat, so that the sealing seat can slide to the end of the filling tube under the action of the elastic reset component.

[0006] When injecting liquid, align the injection needle coaxially with the injection hole of the battery and insert it. The sealing gasket on the sealing seat first contacts the outer end of the injection hole. As the injection needle is continuously inserted, the sealing seat compresses the elastic reset component and finally stops sliding under the action of the limit component. After the sealing seat stops sliding, it is pressed against the outer end of the injection hole by the sealing gasket to form a seal. After the injection is completed, when the injection needle is pulled out, the sealing seat slides toward the end of the injection needle under the elastic force of the elastic reset component, thereby pushing down all the electrolyte attached to the surface of the injection tube. This can greatly reduce the adhesion of electrolyte on the surface of the injection tube, reduce the electrolyte dripping to the edge of the battery injection hole, and reduce the probability of problems such as explosion holes during the welding process of the sealing nail, which is beneficial to ensure the quality of the battery.

[0007] Furthermore, the limiting assembly includes a base fixed on the injection tube, the base has a threaded hole set through, the threaded hole is matched with a limiting bolt set toward the sealing seat, and the center distance between the limiting bolt and the injection tube is smaller than the radius of the sealing seat.

[0008] In this way, by adjusting the length of the limiting bolt toward one end of the sealing seat, the sliding distance of the sealing seat can be controlled, that is, the length of the injection tube extending into the injection hole is controlled, so that it can be suitable for batteries of different lengths.

[0009] Furthermore, a sealing ring is arranged in the guide hole.

[0010] Furthermore, two sealing rings are arranged at intervals along the axial direction of the guide hole.

[0011] Furthermore, the middle part of the sealing gasket has an elastic sleeve extending axially outward, the diameter of the elastic sleeve gradually decreases in the direction away from the sealing gasket, and the minimum diameter of the elastic sleeve is smaller than the diameter of the injection tube.

[0012] Since the minimum diameter of the elastic sleeve is smaller than the diameter of the injection tube, the elastic sleeve can always be in contact with the outer surface of the injection tube, and the electrolyte attached to the surface of the injection tube can be better removed by the elastic sleeve.

[0013] Furthermore, the end of the injection tube shrinks toward the middle to form a cone shape.

[0014] Furthermore, the length of the elastic sleeve is 3 to 8 mm.

[0015] Furthermore, one end of the liquid injection tube away from the sealing gasket has an external thread.

[0016] Furthermore, the elastic reset component is a coil spring, and two ends of the coil spring are respectively connected to the limit assembly and the sealing seat.

[0017] In summary, the utility model has the advantages of clever structural design, being able to reduce the electrolyte attached to the needle surface, and being beneficial to ensuring the quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of the dotted circle part.

[0020] Figure 3 It is a structural schematic diagram of the utility model in the liquid injection state. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the embodiments.

[0022] When implementing: Figure 1 to Figure 3 As shown, a battery injection needle comprises a cylindrical sealing seat 1, the sealing seat 1 is provided with a coaxially through-set guide hole, an injection tube 2 is slidably and sealingly penetrated in the guide hole; a sealing ring 6 is provided in the guide hole, and two sealing rings 6 are provided at intervals along the axial direction of the guide hole; a sealing gasket 3 is coaxially protrudingly set on one side of the sealing seat 1, a limiting component 4 is provided on the injection tube 2, and the limiting component 4 is located on the side of the sealing seat 1 away from the sealing gasket 3; the end of the injection tube 2 away from the sealing gasket 3 has an external thread; an elastic reset component 5 is provided between the limiting component 4 and the sealing seat 1, so that the sealing seat 1 can slide to the end of the injection tube 2 under the action of the elastic reset component 5.

[0023] In this embodiment, the elastic reset component 5 is a coil spring, and the two ends of the coil spring are respectively connected to the limit component 4 and the sealing seat 1; the limit component 4 includes a base 41 fixed on the injection tube 2, and the base 41 has a threaded hole set through, and the threaded hole is matched with a limit bolt 42 set toward the sealing seat 1, and the center distance between the limit bolt 42 and the injection tube 2 is smaller than the radius of the sealing seat 1.

[0024] The end of the injection tube 2 shrinks toward the middle and forms a cone. The middle part of the sealing gasket 3 has an elastic sleeve 7 extending axially outward, and the length of the elastic sleeve 7 is 3 to 8 mm. The diameter of the elastic sleeve 7 gradually decreases in the direction away from the sealing gasket 3, and the minimum diameter of the elastic sleeve 7 is smaller than the diameter of the injection tube 2.

[0025] When injecting liquid, align the injection needle coaxially with the injection hole of the battery and insert it. The sealing gasket on the sealing seat first abuts against the outer end of the injection hole. As the injection needle is continuously inserted, the sealing seat compresses the elastic reset component and finally stops sliding under the action of the limit component. Figure 3 As shown, after the sealing seat stops sliding, it forms a seal by pressing the sealing pad against the outer end of the injection hole. After the injection is completed, when the injection needle is pulled out, the sealing seat slides toward the end of the injection needle under the elastic force of the elastic reset assembly, thereby pushing down all the electrolyte attached to the surface of the injection tube. This can greatly reduce the adhesion of electrolyte on the surface of the injection tube, reduce the electrolyte dripping to the edge of the battery injection hole, and reduce the probability of problems such as explosion holes during the welding of the sealing nail, which is beneficial to ensure the quality of the battery. For batteries of different lengths, by adjusting the length of the limit bolt toward one end of the sealing seat, the sliding distance of the sealing seat can be controlled, that is, the length of the injection tube extending into the injection hole is controlled.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery injection needle, characterized in that: The invention comprises a cylindrical sealing seat (1), the sealing seat (1) having a coaxially through-going guide hole, the guide hole being provided with a liquid injection tube (2) slidably and sealingly penetrated therein; one side of the sealing seat (1) having a coaxially protruding sealing gasket (3), the liquid injection tube (2) being provided with a limit assembly (4), the limit assembly (4) being located on a side of the sealing seat (1) away from the sealing gasket (3); an elastic reset assembly (5) being provided between the limit assembly (4) and the sealing seat (1), so that the sealing seat (1) can slide to the end of the liquid injection tube (2) under the action of the elastic reset assembly (5).

2. The battery injection needle according to claim 1, characterized in that: The limiting assembly (4) comprises a base (41) fixed on the injection tube (2), the base (41) having a threaded hole extending therethrough, the threaded hole being provided with a limiting bolt (42) arranged towards the sealing seat (1), the center distance between the limiting bolt (42) and the injection tube (2) being smaller than the radius of the sealing seat (1).

3. The battery injection needle according to claim 1, characterized in that: A sealing ring (6) is arranged in the guide hole.

4. The battery injection needle according to claim 3, characterized in that: Two sealing rings (6) are arranged at intervals along the axial direction of the guide hole.

5. The battery injection needle according to claim 1, characterized in that: The middle part of the sealing gasket (3) has an elastic sleeve (7) extending outward in the axial direction, the diameter of the elastic sleeve (7) gradually decreases in a direction away from the sealing gasket (3), and the minimum diameter of the elastic sleeve (7) is smaller than the diameter of the injection tube (2).

6. The battery injection needle according to claim 5, characterized in that: The end of the liquid injection tube (2) contracts toward the middle to form a cone.

7. The battery injection needle according to claim 5, characterized in that: The length of the elastic sleeve (7) is 3 to 8 mm.

8. The battery injection needle according to claim 1, characterized in that: The end of the liquid injection tube (2) facing away from the sealing gasket (3) has an external thread.

9. The battery injection needle according to claim 1, characterized in that: The elastic reset component (5) is a coil spring, and two ends of the coil spring are respectively connected to the limit component (4) and the sealing seat (1).

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