Anti-explosion small lithium battery

Abstract

The utility model discloses an anti-explosion small lithium battery which comprises a lithium battery body, positive and negative poles are fixedly mounted on two sides of the upper surface outside the lithium battery body, an anti-explosion shell is wrapped outside the lithium battery body, anti-explosion shell covers are fixedly connected to two sides of the upper surface of the anti-explosion shell body, and the positive and negative poles are sleeved with the anti-explosion shell covers. First-stage pressure relief holes are formed in the two sides of the interior of the anti-explosion shell cover, a cover body cavity is formed in the top ends of the two first-stage pressure relief holes and located in the anti-explosion shell cover, anti-explosion pressure relief holes are formed in the two sides of the upper portion of the cover body cavity and located in the anti-explosion shell cover, and the first-stage pressure relief holes, the cover body cavity and the anti-explosion pressure relief holes are designed in an intercommunication mode. The lithium battery disclosed by the utility model has the use effects of high-pressure gas pressure relief and explosion prevention, and can effectively perform timely pressure relief treatment on the high-pressure environment in the lithium battery, so that the explosion condition can be effectively avoided, and the lithium battery has a relatively good explosion-proof use effect.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to an explosion-proof small lithium battery. Background Art

[0002] Lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and non-aqueous electrolyte solution. It is different from rechargeable lithium-ion batteries and lithium-ion polymer batteries. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology at the end of the 20th century, the number of miniaturized devices has increased, which has put forward high requirements for power sources;

[0003] Lithium batteries have entered the large-scale practical stage. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium metal batteries are usually non-rechargeable and contain metallic lithium. Lithium ion batteries do not contain metallic lithium and are rechargeable;

[0004] Lithium batteries are prone to internal temperature rise and generation of large amounts of high-pressure gas when subjected to abuse such as short circuit and overcharging. If the internal high-pressure environment cannot be depressurized in a timely manner, an explosion may easily occur, affecting the safety of the lithium battery. Therefore, the utility model proposes an explosion-proof small lithium battery. Utility Model Content

[0005] The purpose of the utility model is to provide an explosion-proof small lithium battery to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an explosion-proof small lithium battery, comprising a lithium battery body, positive and negative poles are fixedly installed on both sides of the outer upper surface of the lithium battery body, the lithium battery body is wrapped with an explosion-proof shell on the outside, explosion-proof shell covers are fixedly connected to both sides of the upper surface of the explosion-proof shell body, the explosion-proof shell cover is sleeved on the outside of the positive and negative poles, primary pressure relief holes are arranged on both sides inside the explosion-proof shell cover, a cover body cavity is arranged at the top of the two primary pressure relief holes and located inside the explosion-proof shell cover, explosion-proof pressure relief holes are arranged on both sides above the cover body cavity and located inside the explosion-proof shell cover, the primary pressure relief holes, the cover body cavity and the explosion-proof pressure relief holes are designed to be interconnected, an inner floating plate is arranged inside the cover body cavity, and the inner floating plate is movably connected to the cover body cavity.

[0007] Preferably, an explosion-proof membrane is provided inside the top end of the explosion-proof pressure relief hole, and the explosion-proof membrane is a rubber film.

[0008] Preferably, a clamp connected integrally is provided in the middle of the inner floating plate, and ejector seats are fixedly mounted on both sides of the upper surface of the inner floating plate.

[0009] Preferably, explosion-proof ejectors are fixedly mounted on the upper surfaces of the two ejector seats, and the explosion-proof ejectors are placed inside the explosion-proof pressure relief holes.

[0010] Preferably, an explosion-proof filling layer is provided inside the explosion-proof housing, and the explosion-proof filling layer is filled with sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, ammonium bicarbonate or a mixture thereof.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model can achieve the use effect of high-pressure gas pressure relief and explosion-proof through the coordinated use of the structures, and can effectively and timely relieve the high-pressure environment inside the lithium battery, thereby effectively avoiding the occurrence of explosions, having a good explosion-proof use effect, and making the lithium battery of the utility model have higher use safety, good use performance, and high safety performance;

[0013] The utility model is provided with an explosion-proof membrane, which can seal the explosion-proof pressure relief hole exposed to the outside when the lithium battery body is in normal use, thereby ensuring the internal sealing of the explosion-proof structure, thereby effectively preventing the inside of the explosion-proof shell cover from being invaded by dust, having a certain sealing protection effect, and improving the overall use effect of the lithium battery body;

[0014] An explosion-proof filling layer is arranged inside the explosion-proof casing. The explosion-proof filling layer can undergo an endothermic reaction when heated during use, and a carbonate fire extinguishing material that produces carbon dioxide is used as a working medium. This helps the lithium battery to absorb heat and isolate oxygen to prevent fire and explosion. It has good safety in use and can effectively provide wrapped explosion-proof protection for the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal cross-sectional structure of a lithium battery body according to an embodiment of the utility model;

[0016] Figure 2 For the utility model embodiment Figure 1 A schematic diagram of the enlarged structure of region A;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner floating plate of an embodiment of the utility model.

[0018] In the figure: 1. lithium battery body; 2. positive and negative poles; 3. explosion-proof shell; 4. explosion-proof shell cover; 5. primary pressure relief hole; 6. cover cavity; 7. inner floating plate; 8. ejector seat; 9. explosion-proof ejector; 10. explosion-proof pressure relief hole; 11. explosion-proof membrane; 12. clamp. 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] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1-3 The utility model provides an embodiment: an explosion-proof small lithium battery, including a lithium battery body 1, positive and negative poles 2 are fixedly installed on both sides of the upper surface of the lithium battery body 1, and the lithium battery body 1 is wrapped with an explosion-proof shell 3 on the outside, and both sides of the upper surface of the explosion-proof shell 3 are fixedly connected with an explosion-proof shell cover 4, and the explosion-proof shell cover 4 is sleeved on the outside of the positive and negative poles 2;

[0023] A primary pressure relief hole 5 is provided on both sides of the explosion-proof shell cover 4, and the primary pressure relief hole 5 is used to relieve the high-pressure gas environment generated by the lithium battery body 1. A cover body cavity 6 is provided at the top of the two primary pressure relief holes 5 and located inside the explosion-proof shell cover 4. Explosion-proof pressure relief holes 10 are provided on both sides above the cover body cavity 6 and located inside the explosion-proof shell cover 4. The primary pressure relief hole 5, the cover body cavity 6 and the explosion-proof pressure relief hole 10 are designed to be interconnected;

[0024] An inner floating plate 7 is arranged inside the cover body cavity 6, and an integrally connected clamp 12 is arranged in the middle of the inner floating plate 7. The clamp 12 ensures that the explosion-proof shell cover 4 can be sleeved outside the positive and negative poles 2 to ensure its normal use. The inner floating plate 7 is movably connected to the cover body cavity 6, so that the inner floating plate 7 can float up and down in the cover body cavity 6;

[0025] Among them, an explosion-proof membrane 11 is arranged inside the top of the explosion-proof pressure relief hole 10. The explosion-proof membrane 11 is a rubber film. The explosion-proof membrane 11 can seal the explosion-proof pressure relief hole 10 exposed to the outside when the lithium battery body 1 is in normal use, thereby ensuring the internal sealing of the explosion-proof structure, thereby effectively preventing the inside of the explosion-proof shell cover 4 from being invaded by dust, having a certain sealing protection effect, and improving the use effect of the lithium battery body 1;

[0026] Furthermore, in order to relieve the internal high-pressure environment, ejector seats 8 are fixedly installed on both sides of the upper surface of the inner floating plate 7;

[0027] Furthermore, explosion-proof ejector pins 9 are fixedly mounted on the upper surfaces of the two ejector pin seats 8, and the explosion-proof ejector pins 9 are placed inside the explosion-proof pressure relief holes 10. The explosion-proof pressure relief holes 10 can be used to limit the holes of the built-in explosion-proof ejector pins 9, thereby effectively limiting the inner floating plate 7, avoiding displacement and misalignment of the explosion-proof ejector pins 9, and improving the use effect.

[0028] According to the above structure, when the lithium battery body 1 generates high-pressure gas expansion due to use, the high-pressure gas can enter the explosion-proof shell cover 4 through the first-level pressure relief hole 5. The high-pressure gas entering the first-level pressure relief hole 5 will push the inner floating plate 7 inside the cover body cavity 6, so that the inner floating plate 7 floats upward under the action of the gas. An explosion-proof ejector pin 9 is provided on the upper surface of the inner floating plate 7, so that the explosion-proof ejector pin 9 can be driven to move upward through the movement of the inner floating plate 7, so that the explosion-proof membrane 11 at the top can be pierced by the explosion-proof ejector pin 9. When the explosion-proof membrane 11 is not sealed, the high-pressure gas can be discharged in time through the explosion-proof pressure relief hole 10.

[0029] In this embodiment, an explosion-proof filling layer is provided inside the explosion-proof housing 3, and the explosion-proof filling layer is filled with sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, ammonium bicarbonate or a mixture thereof. The above-mentioned explosion-proof filling layer can undergo an endothermic reaction when heated during use, and at the same time, a carbonate fire extinguishing material that produces carbon dioxide is used as a working medium, thereby helping the lithium battery to absorb heat and isolate oxygen to prevent fire and explosion. It has good safety in use and can effectively provide wrapped explosion-proof protection for the lithium battery.

[0030] Working principle:

[0031] Please refer to the instruction manual for details Figure 1-3As shown in the figure, when the lithium battery body 1 expands with high-pressure gas due to use, the high-pressure gas can enter the explosion-proof shell cover 4 through the primary pressure relief hole 5. The high-pressure gas entering the primary pressure relief hole 5 will push the inner floating plate 7 inside the cover body cavity 6, so that the inner floating plate 7 floats upward under the action of the high-pressure gas. An explosion-proof ejector pin 9 is provided on the upper surface of the inner floating plate 7, so that the explosion-proof ejector pin 9 can be driven to move upward through the movement of the inner floating plate 7, so that the explosion-proof membrane 11 at the top can be punctured by the explosion-proof ejector pin 9. After the explosion-proof membrane 11 is not sealed, the high-pressure gas can be timely discharged through the explosion-proof pressure relief hole 10 for pressure relief;

[0032] The utility model can make the lithium battery of the utility model have the effect of high-pressure gas pressure relief and explosion-proof through the coordinated use of the above structures, and can effectively perform timely pressure relief treatment on the high-pressure environment inside the lithium battery, thereby effectively avoiding the occurrence of explosion, having a good explosion-proof effect, and making the lithium battery of the utility model have high safety in use, good performance in use, and high safety performance;

[0033] In addition, the utility model is provided with an explosion-proof membrane 11, which can seal the explosion-proof pressure relief hole 10 exposed to the outside when the lithium battery body 1 is in normal use, thereby ensuring the internal sealing of the explosion-proof structure, thereby effectively preventing the inside of the explosion-proof shell cover 4 from being invaded by dust, having a certain sealing protection effect, and improving the overall use effect of the lithium battery body 1;

[0034] An explosion-proof filling layer is arranged inside the explosion-proof housing 3. The explosion-proof filling layer can undergo an endothermic reaction when heated during use, and at the same time produce a carbonate fire extinguishing material of carbon dioxide as a working medium, thereby helping the lithium battery to absorb heat and isolate oxygen to prevent fire and explosion. It has good safety in use and can effectively provide wrapped explosion-proof protection for the lithium battery.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An explosion-proof small lithium battery, comprising a lithium battery body (1), characterized in that: Positive and negative poles (2) are fixedly mounted on both sides of the upper surface of the lithium battery body (1); the lithium battery body (1) is wrapped with an explosion-proof shell (3); both sides of the upper surface of the explosion-proof shell (3) are fixedly connected with explosion-proof shell covers (4); the explosion-proof shell covers (4) are sleeved on the outside of the positive and negative poles (2); both sides of the inside of the explosion-proof shell cover (4) are provided with primary pressure relief holes (5); a cover body cavity (6) is provided at the top of the two primary pressure relief holes (5) and located inside the explosion-proof shell cover (4); explosion-proof pressure relief holes (10) are provided on both sides above the cover body cavity (6) and located inside the explosion-proof shell cover (4); the primary pressure relief holes (5), the cover body cavity (6) and the explosion-proof pressure relief holes (10) are designed to be interconnected; an inner floating plate (7) is provided inside the cover body cavity (6); and the inner floating plate (7) is movably connected to the cover body cavity (6).

2. The explosion-proof small lithium battery according to claim 1, characterized in that: An explosion-proof membrane (11) is arranged inside the top end of the explosion-proof pressure relief hole (10), and the explosion-proof membrane (11) is a rubber film.

3. The explosion-proof small lithium battery according to claim 1, characterized in that: An integrally connected clamp (12) is provided in the middle of the inner floating plate (7), and ejector seats (8) are fixedly mounted on both sides of the upper surface of the inner floating plate (7).

4. The explosion-proof small lithium battery according to claim 3, characterized in that: An explosion-proof ejector pin (9) is fixedly mounted on the upper surface of the two ejector pin seats (8), and the explosion-proof ejector pin (9) is placed inside the explosion-proof pressure relief hole (10).

5. The explosion-proof small lithium battery according to claim 1, characterized in that: An explosion-proof filling layer is arranged inside the explosion-proof housing (3), and the explosion-proof filling layer is filled with sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, ammonium bicarbonate or a mixture thereof.

Images