Multilayer flame-retardant sealing ring for lithium battery

Abstract

The multi-layer flame-retardant sealing ring is sequentially provided with a bottom ring, a separation ring, a fire extinguishing ring and a top ring from inside to outside, an annular embedded groove is machined and formed in the bottom ring, a plurality of sets of extrusion columns are evenly distributed in the annular embedded groove, the separation ring is arranged in the annular embedded groove, and a plurality of sets of penetrating openings are evenly formed in the surface of the separation ring. The extrusion column is inserted into the penetrating opening in a penetrating mode, the fire extinguishing ring is located above the separation ring, the fire extinguishing ring is of a double-layer structure and comprises a filling outer ring and an inflation ring arranged in the filling outer ring, the filling outer ring is filled with dry powder, and the top ring is located above the fire extinguishing ring. The lithium battery flame-retardant sealing ring designed by the utility model not only can achieve the purpose of flame retardance, but also can achieve the purpose of assisting in extinguishing fire, so that the safety of the lithium battery in the use process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a multi-layer flame-retardant sealing ring for lithium batteries. Background Technique

[0002] A lithium battery is a type of battery that uses the ion migration of lithium ions between the positive and negative electrodes to store and release electrical energy. It is an important rechargeable battery technology and is widely used in fields such as modern electronic devices, portable electronic products, and electric vehicles. To improve the safety of lithium batteries, a lithium battery flame-retardant sealing ring is usually equipped at the end of a single lithium battery. The lithium battery flame-retardant sealing ring is a special sealing ring for lithium batteries and has the characteristics of fire prevention and flame retardancy. It is usually located between the positive and negative electrodes of the lithium battery and is used to isolate and seal the active substances and electrolytes inside the battery, and at the same time has the function of preventing the battery from catching fire or thermal runaway.

[0003] However, the existing lithium battery flame-retardant sealing rings have the following problems in the process of use: the flame-retardant method of the lithium battery flame-retardant sealing ring mainly achieves the purpose of flame retardancy through the high temperature resistance and flame retardancy of its own material. Its own structure is relatively simple and the functionality is relatively single, lacking means of auxiliary fire suppression. Therefore, corresponding technical solutions need to be designed to solve the existing technical problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a multi-layer flame-retardant sealing ring for lithium batteries, which solves the technical problem that the flame-retardant method of the lithium battery flame-retardant sealing ring mainly achieves the purpose of flame retardancy through the high temperature resistance and flame retardancy of its own material, its own structure is relatively simple and the functionality is relatively single, lacking means of auxiliary fire suppression.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a multi-layer flame-retardant sealing ring for lithium batteries, which is sequentially provided with a bottom ring, a partition ring, a fire extinguishing ring and a top ring from the inside to the outside. An annular embedded groove is processed and formed inside the bottom ring, and a number of groups of extrusion columns are evenly distributed in the annular embedded groove. The partition ring is placed inside the annular embedded groove and a number of groups of through holes are evenly opened on the surface. The extrusion columns are inserted into the through holes. The fire extinguishing ring is located above the partition ring. The fire extinguishing ring is a double-layer structure and includes a filling outer ring and an inflatable ring placed inside the filling outer ring. The inside of the filling outer ring is filled with dry powder. The top ring is located above the fire extinguishing ring.

[0006] As a preferred mode of the utility model, the lower diameter of the extrusion column is smaller than the upper diameter, and the upper end of the extrusion column is in a spherical structure.

[0007] As a preferred mode of the utility model, the partition ring is made of rubber material and filled with nitrogen inside, and the partition ring is in a laminated structure.

[0008] As a preferred embodiment of the present utility model, discharge slits are distributed on both the outer and inner circles of the filling outer ring, and the discharge slits are in a point - broken structure.

[0009] As a preferred embodiment of the present utility model, the top ring includes a ring body and an annular outer film distributed on the outer side of the ring body, and the top of the fire - extinguishing ring is embedded in the ring body.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. This solution improves the structure of the existing flame - retardant sealing ring for lithium batteries. The flame - retardant sealing ring is designed as a four - layer structure, which is successively provided with a bottom ring, a partition ring, a fire - extinguishing ring and a top ring from the inside to the outside. Its main material is a flame - retardant material to ensure its flame - retardancy. If a lithium battery catches fire, the dry powder inside the internal fire - extinguishing ring can be used to assist in extinguishing the fire, improving the functionality of the flame - retardant sealing ring.

[0012] 2. The designed lithium - battery flame - retardant sealing ring of this solution can not only achieve the purpose of flame retardancy, but also achieve the purpose of assisting in extinguishing the fire, improving the safety of the lithium battery during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the installation structure diagram of the flame - retardant sealing ring described in the present utility model;

[0014] Figure 2 is the structure diagram of the flame - retardant sealing ring described in the present utility model;

[0015] Figure 3 is the structure diagram of the fire - extinguishing ring described in the present utility model;

[0016] Figure 4 is the partial A structure diagram of the present utility model;

[0017] Figure 5 is the structure diagram of the discharge slit described in the present utility model.

[0018] In the figure: 1, bottom ring; 2, partition ring; 3, fire - extinguishing ring; 4, top ring; 5, annular embedded groove; 6, extrusion column; 7, through - hole; 8, filling outer ring; 9, inflatable ring; 10, discharge slit; 11, ring body; 12, annular outer film. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-5 , the present invention provides a technical solution: a multi-layer flame-retardant sealing ring for a lithium battery, which is sequentially provided with a bottom ring 1, a partition ring 2, a fire-extinguishing ring 3 and a top ring 4 from the inside to the outside. An annular embedded groove 5 is formed inside the bottom ring 1, and a plurality of groups of extrusion columns 6 are evenly distributed in the annular embedded groove 5. The partition ring 2 is placed in the annular embedded groove 5, and a plurality of groups of through holes 7 are evenly formed on the surface. The extrusion columns 6 are inserted into the through holes 7. The fire-extinguishing ring 3 is located above the partition ring 2. The fire-extinguishing ring 3 is a double-layer structure and includes a filling outer ring 8 and an inflation ring 9 placed inside the filling outer ring 8. The inside of the filling outer ring 8 is filled with dry powder, and the top ring 4 is located above the fire-extinguishing ring 3.

[0021] Further improved, as Figure 2 shown: the lower diameter of the extrusion column 6 is smaller than the upper diameter, and the upper end of the extrusion column 6 is in a spherical structure.

[0022] Further improved, as Figure 1 shown: the partition ring 2 is made of rubber material and filled with nitrogen inside. Nitrogen is an inert gas that can achieve the purpose of extinguishing fire. The partition ring 2 is in a laminated structure. When the partition ring 2 is damaged by an open flame, the nitrogen inside is sprayed outwards, which can extinguish the open flame.

[0023] Further improved, as Figure 5 shown: discharge gaps 10 are distributed on both the outer and inner circles of the filling outer ring 8. The discharge gaps 10 are in a point-break structure. In the normal state, the discharge gaps 10 are in a closed state. When the gas in the internal inflation ring 9 is released, it acts on the discharge cracks 10, and the arranged cracks 10 open and spray out the internal dry powder.

[0024] Specifically, the top ring 4 includes a ring body 11 and an annular outer film 12 distributed on the outside of the ring body 11. The top of the fire-extinguishing ring 3 is embedded in the ring body 11.

[0025] During use: When there is an open flame during the combustion of the lithium battery of the present utility model, the partition ring 2 is damaged when exposed to the open flame, and the internal nitrogen gas is sprayed outwards, which can achieve extinguishing the open flame. After the nitrogen gas is discharged, the thickness of the partition ring 2 is reduced. At this time, the poultry and livestock 6 located in the through hole 7 act on the fire extinguishing ring 3 and squeeze the inflation ring 9. The inflation ring 9 is broken by the squeezing force, and the internal gas is sprayed outwards and accompanied by dry powder sprayed out from the arranged cracks 10, achieving the purpose of extinguishing the lithium battery, greatly improving the safety of the lithium battery.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle part", "the other end", "upper", "one side", "top", "inner", "front part", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0027] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0028] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multi-layer flame-retardant sealing ring for lithium batteries, characterized in that: From the inside to the outside, a bottom ring (1), a separation ring (2), a fire extinguishing ring (3) and a top ring (4) are sequentially arranged. The bottom ring (1) is internally machined to have an annular embedded groove (5). A plurality of groups of extrusion columns (6) are evenly distributed in the annular embedded groove (5). The separation ring (2) is built into the annular embedded groove (5) and a plurality of groups of through-holes (7) are evenly opened on the surface. The extrusion columns (6) are inserted into the through-holes (7). The fire extinguishing ring (3) is located above the separation ring (2). The fire extinguishing ring (3) is a double-layer structure and comprises a filling outer ring (8) and an inflatable ring (9) built into the filling outer ring (8). The filling outer ring (8) is filled with dry powder. The top ring (4) is located above the fire extinguishing ring (3).

2. The multi-layer flame-retardant sealing ring for lithium battery according to claim 1, characterized in that: The diameter of the lower end of the extrusion column (6) is smaller than the diameter of the upper end, and the upper end of the extrusion column (6) is in a spherical structure.

3. The multi-layer flame-retardant sealing ring for lithium battery according to claim 1, characterized in that: The separation ring (2) is made of rubber material and is filled with nitrogen; the separation ring (2) is in a layered structure.

4. The multi-layer flame-retardant sealing ring for lithium battery according to claim 1, characterized in that: The outer ring and the inner ring of the filling outer ring (8) are both provided with discharge gaps (10), and the discharge gaps (10) are in a dot-break structure.

5. The multi-layer flame-retardant sealing ring for lithium battery according to claim 1, characterized in that: The top ring (4) comprises a ring body (11) and an annular outer membrane (12) distributed outside the ring body (11), and the top of the fire extinguishing ring (3) is embedded in the ring body (11).

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