A well-sealed battery terminal structure

Abstract

This utility model discloses a battery terminal structure with good sealing performance, including a terminal body. The terminal body has a first injection hole and a second injection hole inside. The first injection hole is located above the second injection hole and is connected to it. The inner diameter of the first injection hole is larger than that of the second injection hole. A rubber stopper is embedded inside the first injection hole, and a sealing pin is threadedly connected to the upper end of the rubber stopper inside the first injection hole. This utility model uses the sealing pin to tightly press the rubber stopper at the step between the first and second injection holes, effectively ensuring the sealing effect of the injection holes and preventing moisture from entering the battery through the injection holes, which could lead to battery performance degradation, battery downgrading, or even battery failure.

Description

Technical Field

[0001] This utility model belongs to the field of electrode technology, specifically relating to a battery electrode structure with good sealing performance. Background Technology

[0002] Currently, the electrolyte filling hole structure of batteries on the market is simple, with most being hollow cylindrical structures. After electrolyte filling or formation, cylindrical rubber plugs are usually inserted into the filling hole.

[0003] However, there are cases where the rubber stopper is not tightly inserted into the filling hole, resulting in gaps. This allows moisture to easily enter through the gaps between the rubber stopper and the filling hole, ultimately causing a decline in battery performance, battery downgrading, or scrapping.

[0004] In addition, for batteries using the full-tab flattening process, after the flattened end of the cell is welded to the current collector, the contact between the flattened end of the cell and the current collector is tight and the gap is small, resulting in slow electrolyte injection and seriously affecting the injection efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a battery terminal structure with good sealing performance to solve the problems mentioned in the background art. The battery terminal structure provided by this invention has the characteristic of good sealing performance after liquid filling.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a battery terminal structure with good sealing performance, comprising a terminal body, wherein a first liquid injection hole and a second liquid injection hole are provided inside the terminal body, wherein the first liquid injection hole is located at the upper end of the second liquid injection hole and is connected to the second liquid injection hole, the inner diameter of the first liquid injection hole is larger than that of the second liquid injection hole, a rubber stopper is embedded inside the first liquid injection hole, and a sealing pin located at the upper end of the rubber stopper is threadedly connected inside the first liquid injection hole.

[0007] To achieve a secondary seal for the injection hole and prevent moisture from entering the battery, the upper surface of the sealing pin is flush with the upper surface of the electrode body, and the sealing pin and the electrode body are sealed by laser welding.

[0008] To facilitate fusion during laser welding, the sealing pins are further made of aluminum.

[0009] To ensure a proper seal for the injection hole, the rubber stopper is further fitted with an interference fit to the first injection hole.

[0010] In order to make the rubber stopper resistant to high temperature and electrolyte corrosion, the material of the rubber stopper includes, but is not limited to, fluororubber, silicone rubber or EPDM rubber.

[0011] To facilitate laser welding between the electrode body and the collector plate, a boss is provided on the lower end of the electrode body, and a connecting part for connecting with the collector plate is provided below the boss.

[0012] To accelerate the injection speed, the boss is further provided with several connecting holes that communicate with the second injection hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model uses a sealing pin to press the rubber stopper tightly at the step between the first and second injection holes, which effectively ensures the sealing effect of the injection holes and prevents moisture from entering the battery through the injection holes, thus avoiding problems such as battery performance degradation, battery downgrading, or scrapping.

[0015] 2. The sealing pin and the electrode body of this utility model are sealed by laser welding, which realizes a secondary seal on the liquid injection hole and eliminates the possibility of water vapor entering the battery.

[0016] 3. The lower end of the electrode body of this utility model is provided with a boss, and a connecting part for connecting with the collector plate is provided below the boss, which facilitates laser welding between the electrode body and the collector plate.

[0017] 4. The protrusion of this utility model is provided with several connecting holes that communicate with the second injection hole. During the injection process, a portion of the electrolyte flows out from the lower end of the second injection hole and is injected into the battery, while a portion of the electrolyte flows into the battery from the connecting holes, effectively accelerating the injection speed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the pole body of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of this utility model connected to the collector plate.

[0021] In the figure: 1. Sealing pin; 2. Rubber plug; 3. Electrode body; 31. Boss; 32. First injection hole; 33. Second injection hole; 34. Connecting hole; 35. Connecting part; 4. Collector plate. Detailed Implementation

[0022] 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.

[0023] Example 1

[0024] Please see Figures 1-3 The present invention provides the following technical solution: a battery terminal structure with good sealing performance, including a terminal body 3, wherein the terminal body 3 has a first liquid injection hole 32 and a second liquid injection hole 33 inside, wherein the first liquid injection hole 32 is located at the upper end of the second liquid injection hole 33 and the first liquid injection hole 32 is connected to the second liquid injection hole 33, the inner diameter of the first liquid injection hole 32 is larger than that of the second liquid injection hole 33, a rubber stopper 2 is embedded inside the first liquid injection hole 32, and a sealing pin 1 located at the upper end of the rubber stopper 2 is also threadedly connected inside the first liquid injection hole 32.

[0025] By adopting the above technical solution, this utility model uses the sealing nail 1 to press the rubber stopper 2 tightly at the step between the first injection hole 32 and the second injection hole 33, which effectively ensures the sealing effect of the injection hole and prevents water vapor from entering the battery through the injection hole, which would lead to battery performance degradation, battery downgrading or scrapping.

[0026] Specifically, the upper surface of the sealing pin 1 is flush with the upper surface of the pole body 3, and the sealing pin 1 and the pole body 3 are sealed by laser welding.

[0027] By adopting the above technical solution, a secondary seal is achieved for the injection hole, eliminating the possibility of moisture entering the battery.

[0028] Specifically, sealing nail 1 is a pure aluminum component.

[0029] By adopting the above technical solution, the material of the pole body 3 is also pure aluminum, and the material of the sealing nail 1 is the same as that of the pole body 3, which facilitates fusion during laser welding.

[0030] Specifically, the rubber stopper 2 is interference-fitted with the first injection hole 32.

[0031] By adopting the above technical solution, the sealing effect of the injection hole is guaranteed.

[0032] Specifically, the material of the rubber stopper 2 includes, but is not limited to, one of fluororubber, silicone rubber or EPDM rubber, and in this embodiment, fluororubber is preferred.

[0033] By adopting the above technical solution, the rubber stopper 2 has the effect of high temperature resistance and electrolyte corrosion resistance.

[0034] Example 2

[0035] The difference between this embodiment and embodiment 1 is that: specifically, a boss 31 is provided on the lower end of the pole body 3, and a connecting part 35 for connecting with the collector plate 4 is provided below the boss 31.

[0036] By adopting the above technical solution, it is convenient to perform laser welding between the pole body 3 and the collector plate 4, and the boss 31 can be used for positioning between the pole body 3 and the collector plate 4.

[0037] Example 3

[0038] The difference between this embodiment and embodiment 2 is that, specifically, the boss 31 is provided with a plurality of connecting holes 34 that communicate with the second injection hole 33.

[0039] By adopting the above technical solution, during the electrolyte injection process, a portion of the electrolyte flows out from the lower end of the second injection hole 33 and is injected into the battery, while a portion of the electrolyte flows into the battery from the connecting hole 34, effectively accelerating the electrolyte injection speed.

[0040] In summary, this invention effectively seals the injection hole by pressing the rubber stopper 2 tightly against the step between the first injection hole 32 and the second injection hole 33 with the sealing pin 1, preventing moisture from entering the battery and causing performance degradation, battery downgrading, or even battery failure. The sealing pin 1 and the electrode body 3 are sealed by laser welding, achieving a secondary seal for the injection hole and eliminating the possibility of moisture entering the battery. The lower end of the electrode body 3 has a boss 31, and below the boss 31 is a connecting part 35 for connecting to the collector plate 4, facilitating laser welding between the electrode body 3 and the collector plate 4. The boss 31 has several connecting holes 34 that communicate with the second injection hole 33. During the injection process, a portion of the electrolyte flows out from the lower end of the second injection hole 33 and into the battery, while another portion flows into the battery through the connecting holes 34, effectively accelerating the injection speed.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery post structure having improved sealing, characterized by: The device includes an electrode body, which has a first injection hole and a second injection hole inside. The first injection hole is located above the second injection hole and is connected to it. The inner diameter of the first injection hole is larger than that of the second injection hole. A rubber stopper is embedded inside the first injection hole, and a sealing pin located at the upper end of the rubber stopper is threadedly connected inside the first injection hole.

2. The battery post structure according to claim 1, wherein: The upper end face of the sealing pin is flush with the upper end face of the pole body, and the sealing pin and the pole body are sealed by laser welding.

3. The battery post structure of claim 1, wherein: The sealing pin is an aluminum component.

4. The battery post structure of claim 1, wherein: The rubber stopper is interference-fitted with the first injection hole.

5. The battery terminal structure with good sealing performance according to claim 1, characterized in that: The material of the rubber stopper includes, but is not limited to, fluororubber, silicone rubber, or EPDM rubber.

6. The battery post structure of claim 1, wherein: The lower end of the pole body is provided with a boss, and below the boss is a connecting part for connecting with the collector plate.

7. The battery post structure of claim 6, wherein: The protrusion is provided with several connecting holes that communicate with the second injection hole.

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