Lithium battery explosion-proof cap

Abstract

The utility model relates to a lithium battery explosion -proof cap, including lithium battery main part and cap main part, the cap main part detachable installation battery main part's outside, the top of cap main part protrude and form a protruding portion of one body shape, a plurality of exhaust holes are seted up in the outside of protruding portion, install the corresponding elastic sheet of number with exhaust hole in the top of protruding portion, the one end away from protruding portion of elastic sheet installs the closing plate, a plurality of closing plate cover a plurality of exhaust hole's outside respectively, the top of protruding portion installs electrode sheet, this lithium battery explosion -proof cap, through the cooperation of exhaust hole and closing plate, can open exhaust hole and release pressure when the pressure in battery rises fast, automatically closes after pressure reduction, effectively avoided the explosion, combustion and so on safety accident because of the internal pressure is too high, solved the problem that the traditional cap pressure releases not in time.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a lithium battery explosion-proof cap. Background Technology

[0002] With the rapid development of technology, lithium batteries have been widely used in various fields of modern society due to their significant advantages such as small size, light weight, high capacity, no memory effect, and environmental friendliness. From everyday electronic devices such as mobile phones and laptops to power tools and large equipment such as electric vehicles, lithium batteries have become key energy storage units. Among the many components of a lithium battery, the explosion-proof cap is a core component for ensuring battery safety, and its importance is self-evident. When a lithium battery is overcharged during charging, or when the internal pressure rises sharply due to various reasons during use, the explosion-proof cap needs to activate quickly to release the internal pressure in a timely manner, thereby effectively preventing serious safety accidents such as battery explosion or combustion. However, existing explosion-proof caps for lithium batteries still exhibit numerous problems in practical applications, which urgently need to be addressed. One particularly prominent issue is that the caps on lithium batteries are typically attached directly to the battery. This attached installation method has significant drawbacks in pressure release. When the lithium battery is overcharged during charging, or when the internal pressure rises sharply due to various reasons during use, the tight fit between the cap and the battery makes it difficult for the pressure to be effectively released through the existing cap structure. This causes the internal pressure to accumulate continuously, greatly increasing the risk of battery explosions, fires, and other safety accidents. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a lithium battery explosion-proof cap, which solves the problems mentioned in the technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a lithium battery explosion-proof cap, comprising a lithium battery body and a cap body; The cap body is detachably mounted on the outside of the battery body. The top of the cap body protrudes upward to form a three-dimensional protrusion. Several vent holes are provided on the outside of the protrusion. A number of elastic pieces corresponding to the number of exhaust holes are installed on the top of the protrusion. A closing plate is installed on the end of the elastic piece away from the protrusion. Several closing plates cover the outside of several exhaust holes respectively. An electrode plate is mounted on the top of the protrusion.

[0005] Furthermore, both the electrode sheet and the cap body are made of aluminum alloy.

[0006] Furthermore, the number of the aforementioned vent holes is four, and they are arranged at equal intervals on the outer side of the protrusion.

[0007] Furthermore, the elastic sheet is made of spring steel sheet with a thickness of 0.5 mm.

[0008] Furthermore, the cap body also includes an extension edge extending downward along the outer periphery of the cap body, the extension edge wrapping around the outside of the lithium battery body; The lithium battery body and the cap body are covered with the same insulating film on their outer sides.

[0009] Furthermore, an annular groove is formed on the outer side of the lithium battery body, and an annular protrusion is integrally formed on the inner peripheral wall of the extended edge corresponding to the annular groove.

[0010] Furthermore, the outer side of the extended edge has several openings with open bottoms to divide the extended edge into multiple segments.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. This lithium battery explosion-proof cap, through the cooperation of the vent and the closing plate, can quickly open the vent to release pressure when the internal pressure of the battery increases, and automatically close after the pressure decreases, effectively avoiding safety accidents such as explosion and combustion caused by excessive internal pressure, and solving the problem of untimely pressure release of traditional caps.

[0012] 2. The explosion-proof cap for the lithium battery is connected to the main body of the lithium battery through an annular protrusion and an annular groove. With the extension edge wrapping, the connection is guaranteed to be stable and the cap is prevented from falling off. The cap body and electrode plates made of aluminum alloy have good strength and corrosion resistance, which extends the service life of the device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the unfolded structure of this utility model; Figure 4 This is a schematic diagram of the disassembled structure of this utility model.

[0014] In the diagram: 1. Lithium battery body; 2. Cap body; 3. Insulating film; 201. Protrusion; 202. Vent hole; 203. Elastic sheet; 204. Closing plate; 205. Electrode sheet; 206. Extension edge. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1-4 The explosion-proof cap for a lithium battery in this embodiment includes a lithium battery body 1, a cap body 2, and an insulating film 3.

[0017] Specifically, the lithium battery body 1, as the core component for energy storage, has an annular groove on its outer side for a secure connection with the cap body 2. The cap body 2 is detachably installed on the outer side of the lithium battery body 1 and is made of aluminum alloy, which has both good conductivity and structural strength, and meets the requirements for lightweighting.

[0018] In detail, the top of the cap body 2 protrudes upward to form a platform-shaped protrusion 201. Four vent holes 202 are provided on the outer side of the protrusion 201, which are equally spaced to release gas when the internal pressure of the battery increases. The top of the protrusion 201 is equipped with elastic plates 203 in a number corresponding to the number of vent holes 202. The elastic plates 203 are made of spring steel sheets with a thickness of 0.5 mm, which have excellent elasticity and toughness. A closing plate 204 is installed at the end away from the protrusion 201. The four closing plates 204 respectively cover the outer side of the four vent holes 202 to keep the vent holes 202 closed under normal conditions.

[0019] In actual operation, the elastic force of the elastic piece 203 ensures that the closing plate 204 tightly covers the vent hole 202 under normal conditions, guaranteeing the internal sealing of the battery and preventing electrolyte leakage or the entry of external impurities. When the internal pressure of the battery increases, the pressure pushes the closing plate 204 to overcome the elastic force of the elastic piece 203, causing the vent hole 202 to open and release the pressure. After the pressure decreases, the elastic piece 203 drives the closing plate 204 to reset and re-close the vent hole 202, realizing an automatic pressure relief and sealing cycle, which effectively improves the safety of the battery.

[0020] Furthermore, an electrode plate 205 is also installed on the top of the protrusion 201. The electrode plate 205 is also made of aluminum alloy and serves as the electrode output terminal of the lithium battery to realize the conduction of current. The cap body 2 also includes an extension edge 206 extending downward along its outer periphery. The extension edge 206 wraps around the outside of the lithium battery body 1. Its inner peripheral wall is integrally formed with an annular protrusion that matches the annular groove of the lithium battery body 1. The cooperation between the annular protrusion and the annular groove enhances the stability of the connection between the cap body 2 and the lithium battery body 1.

[0021] In addition, the outer side of the extension edge 206 has several openings with open bottoms, dividing the extension edge 206 into multiple segments. The openings on the outer side of the extension edge 206 divide it into multiple segments, giving the extension edge 206 a certain amount of flexible adjustment space during installation, which facilitates adaptive adjustment according to the size of the lithium battery body 1 during installation.

[0022] In actual setup, the annular protrusion of the extended edge 206 cooperates with the annular groove of the lithium battery body 1. This connection method not only ensures the stability of the connection between the two and prevents the cap body 2 from falling off during battery use, but also facilitates the disassembly of the cap body 2 for maintenance or replacement when needed. At the same time, the wrapping of the lithium battery body 1 by the extended edge 206 also enhances the sealing of the overall structure.

[0023] Furthermore, the outer sides of the lithium battery body 1 and the cap body 2 are covered with the same insulating film 3, which serves to insulate and protect the battery and prevent short circuits during use.

[0024] The lithium battery body 1 and the cap body 2 are covered with an insulating film 3. The insulating film 3 can effectively isolate the battery from contact with external conductors to prevent short circuit accidents. At the same time, it also protects the lithium battery body 1 and the cap body 2 and reduces the damage caused by external collisions.

[0025] The working principle of the above embodiments is as follows: (1) Under normal working conditions of lithium battery, elastic sheet 203 is in a natural state. Its elastic force drives the closing plate 204 to tightly cover the outside of the vent 202, so that the inside of the battery is sealed to prevent electrolyte leakage and external impurities from entering. At the same time, electrode sheet 205 conducts current normally to ensure normal power supply of lithium battery. When the internal pressure of lithium battery increases sharply due to overcharging, short circuit or other reasons, the internal gas pressure will act on the closing plate 204. When the pressure exceeds the elastic force of elastic sheet 203, the closing plate 204 is pushed open, the vent 202 is opened, and the high pressure gas inside the battery is quickly discharged through the vent 202, thereby reducing the internal pressure of the battery and avoiding explosion or combustion accidents caused by excessive pressure.

[0026] (2) When the internal pressure of the battery drops to a safe range, the elastic piece 203 resets under its own elasticity, which drives the closing plate 204 to re-cover the vent hole 202, so that the battery is restored to a sealed state, reducing further loss of electrolyte and extending the battery's service life. In addition, the extension edge 206 cooperates with the annular groove of the lithium battery body 1 through the annular protrusion, ensuring that the cap body 2 will not fall off during pressure changes. The insulating film 3 always plays an insulating and protective role, ensuring the safety of the entire battery use process.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] 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 lithium battery explosion-proof cap, characterized in that: It includes a lithium battery body (1) and a cap body (2); The cap body (2) is detachably installed on the outside of the battery body (1). The top of the cap body (2) protrudes upward to form a three-dimensional protrusion (201). Several vent holes (202) are provided on the outside of the protrusion (201). A number of elastic pieces (203) corresponding to the number of exhaust holes (202) are installed on the top of the protrusion (201). A closing plate (204) is installed on one end of the elastic piece (203) away from the protrusion (201). A plurality of closing plates (204) cover the outside of a plurality of exhaust holes (202). An electrode plate (205) is mounted on the top of the protrusion (201).

2. The explosion-proof cap for a lithium battery according to claim 1, characterized in that: Both the electrode sheet (205) and the cap body (2) are made of aluminum alloy.

3. The explosion-proof cap for a lithium battery according to claim 1, characterized in that: The number of the aforementioned vent holes (202) is four, and they are arranged at equal intervals on the outside of the protrusion (201).

4. The explosion-proof cap for a lithium battery according to claim 1, characterized in that: The elastic sheet (203) is made of spring steel sheet with a thickness of 0.5 mm.

5. The explosion-proof cap for a lithium battery according to claim 1, characterized in that: The cap body (2) also includes an extension edge (206) extending downward along the outer periphery of the cap body (2), the extension edge (206) wrapping around the outside of the lithium battery body (1); The lithium battery body (1) and the cap body (2) are covered with the same insulating film (3).

6. The explosion-proof cap for a lithium battery according to claim 5, characterized in that: An annular groove is formed on the outer side of the lithium battery body (1), and an annular protrusion is integrally formed on the inner peripheral wall of the extended edge (206) corresponding to the annular groove.

7. A lithium battery explosion-proof cap according to claim 5, characterized in that: The outer side of the extended edge (206) has a plurality of openings with open bottoms to divide the extended edge (206) into multiple segments.

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