Sealing rubber nail for liquid injection hole

Abstract

The utility model discloses a liquid injection hole sealing rubber nail which comprises a guiding body, a sealing part and a sealing part. The assembly body is a cylindrical column and is used for being arranged in a liquid injection hole of a battery cell in an interference fit manner, and one end of the assembly body is connected with one end of the guide body; the top cover is circular and is arranged at the other end of the assembly body; wherein the guide body, the assembly body and the top cover are all made of fluororubber, and frosted layers are arranged on the surfaces of the guide body, the assembly body and the top cover. By means of the mode, the liquid injection hole sealing rubber nail is made of fluororubber, the melting point of the fluororubber is 250 DEG C, defects caused by melting due to contact with high temperature in the follow-up welding process can be avoided, meanwhile, the frosted layer is arranged on the surface of the liquid injection hole sealing rubber nail so that surface friction force can be increased, and the service life of the liquid injection hole sealing rubber nail can be prolonged. The phenomenon that the nailing efficiency is affected due to the fact that the liquid injection hole sealing glue nail slips in the nailing process can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a sealing rubber nail for a liquid injection hole. Background Art

[0002] The square aluminum shell battery cell is equipped with a liquid injection port for use during liquid injection. After the liquid injection is completed, the square aluminum shell battery cell needs to be formed. During the formation process, the liquid injection port needs to be temporarily sealed. At this time, it is necessary to insert a glue nail into the liquid injection port, which can play a temporary sealing role. At the same time, the glue nail can facilitate laser cleaning of the liquid injection hole area and prevent welding slag from entering the battery cell.

[0003] However, in the traditional way, the plastic nails on the market generally use PP (polypropylene) + EDPM (ethylene propylene diene monomer rubber) as raw materials, with a melting point of about 150°C. During the subsequent continuous laser welding process of aluminum nails, the temperature can reach 200°C. This material is very easy to melt and produce defects, resulting in leakage of internal electrolyte. In addition, the surface of the plastic nails on the market is smooth. Problems that are prone to occur during the vibration nailing process are: the plastic nails and the vibration disk track wall are prone to slippage, causing the plastic nails to be stuck on the vibration disk track and unable to enter the plastic nail feeding pipe in time, affecting the nailing efficiency. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a liquid injection hole sealing glue nail to solve the above technical problems.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a liquid injection hole sealing nail, characterized in that it includes: a guide body, which is in the shape of a cone; an assembly body, which is in the shape of a cylinder, used for interference fit in the liquid injection hole of the battery cell, wherein one end of the assembly body is connected to one end of the guide body; a top cover, which is in a circular shape and is arranged on the other end of the assembly body; wherein the guide body, the assembly body and the top cover are all made of fluororubber, and the surfaces of the guide body, the assembly body and the top cover are all provided with a frosted layer.

[0008] Furthermore, the guide body, the assembly body and the top cover are integrally formed.

[0009] Furthermore, the outer diameter of the assembly is equal to the diameter of the injection hole.

[0010] Furthermore, the outer diameter of the top cover is larger than the diameter of the injection hole.

[0011] Furthermore, the outer diameter of the other end of the guide body away from the assembly body is smaller than the outer diameter of the assembly body.

[0012] Furthermore, a hole groove is provided at one end of the assembly body, wherein the hole groove is in an arc shape.

[0013] Furthermore, a blind hole is provided on a side of the top cover away from the assembly body, wherein the blind hole is a threaded hole.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the utility model provides a liquid injection hole sealing nail, which has the following beneficial effects: the liquid injection hole sealing nail disclosed in the utility model includes: a guide body, which is in the shape of a cone; an assembly body, which is in the shape of a cylinder, and is used for interference fit in the liquid injection hole of the battery cell, wherein one end of the assembly body is connected to one end of the guide body; a top cover, which is in a circular shape, is arranged on the other end of the assembly body; wherein the guide body, the assembly body and the top cover are all made of fluororubber, and the surfaces of the guide body, the assembly body and the top cover are all provided with a frosted layer. Through the above method, the liquid injection hole sealing nail disclosed in the utility model adopts fluororubber as the material, and the melting point is 250°C, which can avoid defects caused by melting due to contact with high temperature during the subsequent welding process. At the same time, the surface of the liquid injection hole sealing nail is provided with a frosted layer to increase the surface friction, which can prevent the liquid injection hole sealing nail from slipping during the nailing process and affecting the nailing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the installation structure of the sealing glue nail for the injection hole of the utility model;

[0017] Figure 2 This is a first structural schematic diagram of the liquid injection hole sealing rubber nail of the utility model;

[0018] Figure 3 This is a second structural schematic diagram of the injection hole sealing nail of the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model discloses a double-station punching and cutting machine, comprising a cutting machine body, a traction structure for traction of workpieces and movably arranged on the cutting machine body, and a cutting structure for cutting workpieces and movably arranged on the cutting machine body. It should be understood that the cutting machine body and the traction structure in this embodiment can be implemented by products in the prior art, and their principles and structures are not described one by one here.

[0021] like Figure 1-3 As shown, the injection hole sealing nail includes a guide body 10, an assembly body 11 and a top cover 12.

[0022] The guide body 10 is in the shape of a frustum.

[0023] The assembly 11 is cylindrical and is arranged in the injection hole of the battery cell 20 for interference fit, wherein one end of the assembly 11 is connected to one end of the guide body 10. It should be understood that the assembly 11 is a part that fits tightly with the inner wall of the injection hole, and adopts an interference design to effectively seal the injection hole to prevent external impurities from entering and internal electrolyte from leaking out.

[0024] Preferably, the outer diameter of the assembly 11 is equal to the diameter of the injection hole. Further, the outer diameter of the other end of the guide body 10 away from the assembly 11 is smaller than the outer diameter of the assembly 11.

[0025] The top cover 12 has a circular shape, wherein the top cover 12 is disposed on the other end of the assembly body 11 .

[0026] In this embodiment, the guide body 10, the assembly body 11 and the top cover 12 are integrally formed.

[0027] Preferably, the guide body 10, the assembly body 11 and the top cover 12 are all made of fluororubber. It should be understood that the melting point of fluororubber material is about 250°C (degrees), which can avoid defects caused by melting due to contact with high temperature during subsequent welding, and further improve thermal stability.

[0028] Furthermore, the surfaces of the guide body 10, the assembly body 11 and the top cover 12 are all provided with a frosted layer, that is, the surface of the entire injection hole sealing nail is frosted to increase the surface friction, which can prevent the injection hole sealing nail from slipping during the nailing process and affecting the nailing efficiency, which is conducive to stable production of the process.

[0029] In this embodiment, the outer diameter of the top cover 12 is larger than the diameter of the injection hole, so that the injection hole sealing nail can be stuck above the injection hole to prevent the injection hole sealing nail from entering the battery cell through the injection hole, and at the same time, the sealing performance of the injection hole sealing nail can be further improved.

[0030] Furthermore, a hole groove 111 is provided at one end of the assembly 11 of the present embodiment (or the hole groove 111 is provided at the connection between the assembly 11 and the guide body 10), wherein the hole groove 111 is in an arc shape. It should be understood that the hole groove 111 is provided at one end of the assembly 11 close to the guide body 10, and the hole groove 111 provides a space, which can be filled with sufficient helium to facilitate leakage detection, thereby improving the effectiveness of the sealing detection.

[0031] Furthermore, in some embodiments, a blind hole is provided on a side of the top cover 12 away from the assembly body 11, wherein the blind hole is a threaded hole, so that the injection hole sealing nail can be quickly pulled out from the injection hole by a screw threadedly connected in the blind hole.

[0032] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing nail for a liquid injection hole, characterized in that: include: The guide body is in the shape of a frustum; An assembly body, in the form of a cylindrical column, is arranged in the injection hole of the battery cell for interference fit, wherein one end of the assembly body is connected to one end of the guide body; A top cover, which is circular in shape and is disposed on the other end of the assembly; Wherein, the guide body, the assembly body and the top cover are all made of fluororubber, and the surfaces of the guide body, the assembly body and the top cover are all provided with a frosted layer.

2. The liquid injection hole sealing nail according to claim 1, characterized in that: The guide body, the assembly body and the top cover are integrally formed.

3. The injection hole sealing nail according to claim 1, characterized in that: The outer diameter of the assembly is equal to the hole diameter of the injection hole.

4. The liquid injection hole sealing nail according to claim 3, characterized in that: The outer diameter of the top cover is larger than the hole diameter of the liquid injection hole.

5. The liquid injection hole sealing nail according to claim 4, characterized in that: The outer diameter of the other end of the guide body away from the assembly body is smaller than the outer diameter of the assembly body.

6. The liquid injection hole sealing nail according to claim 5, characterized in that: A hole groove is arranged at one end of the assembly body, wherein the hole groove is in an arc shape.

7. The liquid injection hole sealing nail according to claim 1, characterized in that: A blind hole is provided on a side of the top cover away from the assembly body, wherein the blind hole is a threaded hole.

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