Sealing structure convenient for battery exhaust

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a sealing structure convenient for battery exhaust, which comprises a sealing plug and an elastic piece, the sealing plug is arranged at one end of a battery cap body facing the inside of a battery and is opposite to an exhaust hole on the battery cap body, and the elastic piece is arranged in the battery and is opposite to the exhaust hole on the battery cap body. One end of the elastic piece abuts against and is fixed on a central needle of the battery, the other end of the elastic piece abuts against and is fixed on the sealing plug, and the elastic piece pushes the sealing plug to the exhaust hole of the battery cap body in a natural state to seal the exhaust hole. The technical problem that the formation deflation process cost is high due to the fact that the formation deflation process of the lithium battery in the prior art not only needs to waste a temporary sealing plug, but also needs additional working steps is solved, and regular exhaust can be carried out in the use process of the battery, so that the service life of the battery is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a sealing structure that facilitates battery venting. Background Technology

[0002] In the lithium battery production process, temporary sealing plugs are required for formation, a crucial step in lithium battery manufacturing. Formation involves a small-current charge and discharge cycle on the newly manufactured lithium-ion battery. After the charge and discharge cycle, the temporary sealing plug is removed, and the gas inside the lithium battery casing is expelled through the vent on the battery cap. Once the gas is expelled, a secondary sealing step is required, where the permanent sealing plug is installed at the vent on the battery cap. However, this manufacturing process wastes temporary sealing plugs and requires additional steps to replace them with permanent ones. Furthermore, in existing technologies, after battery use, with continuous charge and discharge cycles, internal pressure accumulates, causing the battery to expand and eventually reach the end of its lifespan. Summary of the Invention

[0003] To address the technical problems of high costs and short battery life caused by the waste of temporary sealing plugs and additional steps in the formation and degassing process of existing lithium batteries, this application proposes a sealing structure that facilitates battery degassing, thus solving the aforementioned technical problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] This utility model provides a sealing structure for facilitating battery venting, comprising: a sealing plug disposed at the end of the battery cap facing inwards and directly opposite the vent hole on the battery cap; and an elastic member disposed inside the battery, one end of which abuts against and is fixed to the center pin of the battery, and the other end of which abuts against and is fixed to the sealing plug. In its natural state, the elastic member pushes the sealing plug to the vent hole of the battery cap to seal the vent hole.

[0006] Furthermore, the main body of the sealing plug is a conical cylinder, the wide end of the conical cylinder is connected to the elastic element, and after the narrow end of the conical cylinder enters the vent hole, the outer wall of the conical cylinder fits against the inner wall of the vent hole to seal the vent hole.

[0007] Furthermore, a thin sheet is formed around the outer periphery of the main body of the sealing plug. After the sealing plug enters the vent hole, the outer periphery of the thin sheet adheres to the inner end face of the battery cap, forming a secondary seal on the vent hole under the action of the internal pressure of the battery.

[0008] Furthermore, the inner ring of the thin sheet is integrally formed and connected to the outer ring of the sealing plug, and the thin sheet is inclined toward the inner end face of the battery cap body as it extends from the inner ring to the outer ring.

[0009] Furthermore, the inner ring of the sheet is formed at the wide end of the conical cylinder.

[0010] Furthermore, a receiving ring with an outwardly expanding diameter is disposed on the end of the battery's central pin that is abutted against by the elastic element.

[0011] Furthermore, the elastic element is a spring.

[0012] Furthermore, the sealing plug is made of fluororubber.

[0013] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0014] This utility model's sealing structure facilitates battery venting. When force is applied to the sealing plug from the outside, pushing it into the battery, the vent hole on the battery cap becomes open to the outside, allowing for liquid injection and venting. When the external force is removed, the sealing plug rebounds under the action of the elastic element, sealing the vent hole. At this time, the battery generates internal pressure during charging and discharging, making the sealing plug more secure. In summary, this utility model's sealing structure facilitates battery venting, eliminating the need for temporary sealing plugs in battery production, completing the initial formation, and eliminating the battery sealing step. In addition, the battery can be vented periodically during use, extending its lifespan. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the sealing structure of the present invention for facilitating battery venting when the elastic element is in a compressed state.

[0016] Figure 2 This is a schematic diagram of the sealing structure of this utility model that facilitates battery venting when the elastic element is in its natural state.

[0017] In this utility model: 1-sealing plug, 11-thin sheet; 2-elastic element; 3-battery cap body, 31-vent hole; 4-center pin, 41-receiving ring. Detailed Implementation

[0018] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] like Figure 1-2 As shown, this utility model provides a sealing structure for facilitating battery venting, including a sealing plug 1 and an elastic member 2. The sealing plug 1 is disposed at the end of the battery cap 3 facing the inside of the battery and directly opposite the vent hole 31 on the battery cap 3. The elastic member 2 is disposed inside the battery. One end of the elastic member 2 abuts against and is fixed to the center pin 4 of the battery, and the other end of the elastic member 2 abuts against and is fixed to the sealing plug 1. In its natural state, the elastic member 2 pushes the sealing plug 1 to the vent hole 31 of the battery cap 3 to seal the vent hole 31.

[0020] In a specific embodiment of this utility model, the main body of the sealing plug 1 is a conical cylinder. The wide end of the conical cylinder is connected to the elastic element 2. After the narrow end of the conical cylinder enters the vent hole 31, the outer wall of the conical cylinder fits against the inner wall of the vent hole 31 to seal the vent hole 31.

[0021] In a preferred embodiment of this utility model, a thin sheet 11 is formed around the outer periphery of the main body of the sealing plug 1. After the sealing plug 1 enters the vent hole 31, the outer periphery of the thin sheet 11 adheres to the inner end face of the battery cap 3, forming a secondary seal on the vent hole 31 under the action of the internal pressure of the battery, thereby better ensuring the sealing effect.

[0022] In a preferred embodiment of the present invention, the inner ring of the sheet 11 is integrally formed and connected to the outer ring of the sealing plug 1. As the sheet 11 extends from the inner ring to the outer ring, it tilts toward the inner end face of the battery cap 3, thereby making the outer ring of the sheet 11 fit better against the inner end face of the battery cap 3 to ensure the effect of secondary sealing.

[0023] In one specific embodiment of the present invention, the inner ring of the sheet 11 is formed at the wide end of the conical cylinder.

[0024] In one specific embodiment of this utility model, a receiving ring 41 with an outwardly expanding diameter is provided on the end of the battery's central pin 4 that is abutted by the elastic member 2, so as to receive the elastic member 2.

[0025] In one specific embodiment of this utility model, the elastic element 2 is a spring.

[0026] In one specific embodiment of this utility model, the sealing plug 1 is made of fluororubber.

[0027] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A sealing structure for facilitating battery venting, characterized in that, include: A sealing plug (1) is disposed at one end of the battery cap (3) facing the inside of the battery and directly opposite the vent hole (31) on the battery cap (3); An elastic element (2) is disposed inside the battery. One end of the elastic element (2) abuts against and is fixed to the center pin (4) of the battery, and the other end of the elastic element (2) abuts against and is fixed to the sealing plug (1). In its natural state, the elastic element (2) pushes the sealing plug (1) to the vent hole (31) of the battery cap (3) to seal the vent hole (31).

2. The sealing structure for facilitating battery venting according to claim 1, characterized in that, The main body of the sealing plug (1) is a conical cylinder. The wide end of the conical cylinder is connected to the elastic element (2). After the narrow end of the conical cylinder enters the exhaust hole (31), the outer wall of the conical cylinder fits against the inner wall of the exhaust hole (31) to seal the exhaust hole (31).

3. The sealing structure for facilitating battery venting according to claim 2, characterized in that, The outer periphery of the main body of the sealing plug (1) is formed with a thin sheet (11) around the entire circle. After the sealing plug (1) enters the vent hole (31), the outer periphery of the thin sheet (11) adheres to the inner end face of the battery cap body (3) and forms a secondary seal on the vent hole (31) under the action of the internal pressure of the battery.

4. The sealing structure for facilitating battery venting according to claim 3, characterized in that, The inner ring of the thin sheet (11) is integrally formed and connected to the outer ring of the sealing plug (1), and the thin sheet (11) is inclined toward the inner end face of the battery cap body (3) as it extends from the inner ring to the outer ring.

5. The sealing structure for facilitating battery venting according to claim 3, characterized in that, The inner ring of the sheet (11) is formed at the wide end of the conical cylinder.

6. The sealing structure for facilitating battery venting according to claim 1, characterized in that, The center pin (4) of the battery is abutted by the elastic member (2) and a receiving ring (41) with an outwardly expanding diameter is provided on one end.

7. The sealing structure for facilitating battery venting according to claim 1, characterized in that, The elastic element (2) is a spring.

8. The sealing structure for facilitating battery venting according to claim 1, characterized in that, The sealing plug (1) is made of fluororubber.

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