Lithium battery with explosion-proof function

Abstract

The utility model discloses a lithium battery with anti -explosion function relates to lithium battery technical field, including lithium battery main part, the outside fixed setting of lithium battery main part has the explosion -proof layer, the outside fixed setting of explosion -proof layer has the protective housing, the symmetrical loading groove of being offered to lithium battery main part, the inboard fixed mounting of loading groove has sealed partition strip, the middle part fixed mounting of sealed partition strip has the rubber ring, and the movable rod is inserted in the rubber ring. Through the explosion -proof layer can be used for the protection of lithium battery main part to avoid its because the internal or external of this device and the explosion of the fire, through the steel curtain line of embedding in the explosion -proof layer can make the explosion -proof layer have more structural stability, even if the internal or external explosion of this device, through the effect of explosion -proof layer cooperation steel curtain line, can make this device not break after the fire, thereby reduce this device in the process of charging or using and take place the range of explosion.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a lithium battery with explosion-proof function. Background Technology

[0002] Lithium-ion batteries are a common type of rechargeable battery. They use lithium metal or lithium compounds as the positive electrode material and store and release electrical energy through the migration of lithium ions between the positive and negative electrodes. Lithium-ion batteries have advantages such as high energy density, lightweight, long lifespan, and low self-discharge rate, and are widely used in mobile devices, electric vehicles, and energy storage systems. There are various types, such as lithium-ion batteries, lithium polymer batteries, and lithium iron phosphate batteries. The working principle of lithium-ion batteries is to convert electrical energy through the insertion and extraction of lithium ions in the positive electrode material during the charging and discharging process.

[0003] With the widespread use of portable electronic devices, lithium batteries have become the primary power source. However, lithium batteries are susceptible to thermal runaway when subjected to internal short circuits, overcharging, overheating, or external impacts, potentially leading to fires or even explosions, posing a significant threat to user safety. Therefore, we propose a lithium battery with explosion-proof capabilities to address these technical problems. Summary of the Invention

[0004] In view of this, the present invention addresses the lack of a needle, and its main purpose is to provide a lithium battery with explosion-proof function, which aims to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: It includes a lithium battery body, an explosion-proof layer fixedly disposed on the outer side of the lithium battery body, a protective shell fixedly disposed on the outer side of the explosion-proof layer, loading slots symmetrically opened on the protective shell, a sealing partition strip fixedly installed on the inner side of the loading slot, a rubber ring fixedly installed in the middle of the sealing partition strip, a movable rod inserted into the rubber ring, a penetration mechanism provided below the sealing partition strip on the movable rod, and a limit mechanism provided above the sealing partition strip on the movable rod.

[0006] As a preferred embodiment, the inner side of the explosion-proof layer is embedded with crisscrossing steel cords, and the thickness of the explosion-proof layer is 0.5 to 1.1 cm.

[0007] As a preferred embodiment, the explosion-proof layer is made of polyimide.

[0008] As a preferred embodiment, the penetration mechanism includes a push plate fixedly installed below the sealing partition strip with a movable rod extending therefrom, and bayonets are symmetrically installed on the side of the push plate near the movable rod.

[0009] As a preferred embodiment, the limiting mechanism includes a connecting block that is fixedly installed above the sealing partition strip and extends the movable rod. A connecting strip is fixedly installed at the end of the connecting block away from the movable rod, and an end block is fixedly installed at the end of the connecting strip away from the connecting block.

[0010] As a preferred embodiment, a flow-blocking tube is symmetrically installed on and above the sealing partition strip. The flow-blocking tube is composed of a hollow cuboid with openings at both ends, and the flow-blocking tube corresponds to the bayonet.

[0011] As a preferred embodiment, both ends of the protective housing are provided with protective covers, which are inserted into the connecting strip.

[0012] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, its main features are: This device uses an explosion-proof layer to protect the lithium battery body from explosion caused by fire inside or outside the device. The steel cord embedded inside the explosion-proof layer provides greater structural stability. Even if an explosion occurs inside or outside the device, the explosion-proof layer, in conjunction with the steel cord, will prevent the device from rupturing after the fire, thereby reducing the scope of any potential explosion during charging or use.

[0013] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a front view structural schematic diagram of an embodiment of the present utility model; Figure 2 This is an enlarged structural diagram of point A in an embodiment of this utility model; Figure 3 This is a schematic diagram of the internal structure of an embodiment of the present utility model; Figure 4 This is an enlarged structural schematic diagram of section B in an embodiment of this utility model; Figure 5 This is a schematic diagram of the explosion-proof layer structure according to an embodiment of the present invention; Figure 6 This is a partial cross-sectional structural diagram of an embodiment of the present utility model; Figure 7 This is an enlarged structural diagram of point C in an embodiment of this utility model.

[0015] Explanation of reference numerals in the attached drawings: 1. Protective outer shell; 2. Explosion-proof layer; 3. Steel cord; 4. Lithium battery body; 5. Loading slot; 6. Sealing partition strip; 7. Rubber ring; 8. Movable rod; 9. Push plate; 10. Bayonet; 11. Flow-blocking tube; 12. Connecting block; 13. Connecting strip; 14. End block; 15. Protective cover. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Please see Figures 1 to 7 This utility model embodiment provides a lithium battery with explosion-proof function, including a lithium battery body 4, an explosion-proof layer 2 fixedly disposed on the outer side of the lithium battery body 4, a protective shell 1 fixedly disposed on the outer side of the explosion-proof layer 2, loading grooves 5 symmetrically opened on the protective shell 1, a sealing partition strip 6 fixedly installed on the inner side of the loading groove 5, a rubber ring 7 fixedly installed in the middle of the sealing partition strip 6, a movable rod 8 inserted into the rubber ring 7, a penetrating mechanism provided on the movable rod 8 extending to the lower part of the sealing partition strip 6, a limiting mechanism provided on the movable rod 8 extending to the upper part of the sealing partition strip 6, and a crisscrossing steel cord 3 embedded on the inner side of the explosion-proof layer 2; In this embodiment, the explosion-proof layer 2 can be used to protect the lithium battery body 4 to prevent it from exploding due to fire inside or outside the device. The steel cord 3 embedded inside the explosion-proof layer 2 can make the explosion-proof layer 2 more structurally stable. Even if an explosion occurs inside or outside the device, the explosion-proof layer 2 and the steel cord 3 can prevent the device from cracking after the fire, thereby reducing the scope of the explosion that may occur during charging or use. The explosion-proof layer 2 is made of polyimide, which has excellent heat resistance and chemical corrosion resistance; The penetrating mechanism includes a push plate 9 fixedly installed below the sealing partition strip 6, extending from the movable rod 8. The push plate 9 is symmetrically mounted with bayonets 10 on one side near the movable rod 8. The limiting mechanism includes a connecting block 12 fixedly installed above the sealing partition strip 6, extending from the movable rod 8. A connecting strip 13 is fixedly installed at the end of the connecting block 12 away from the movable rod 8. An end block 14 is fixedly installed at the end of the connecting strip 13 away from the connecting block 12. Protective covers 15 are provided at both ends of the protective shell 1. The protective covers 15 are inserted into the connecting strip 13. The loading slot 5 provides loading space for the sealing partition 6 and its internal components in this device. The sealing partition 6 divides the loading slot 5 into two spaces: the space above the sealing partition 6 is the buffer space after an explosion, and the space below the sealing partition 6 is the loading space for loading the buffer body when no explosion occurs. The loading space is the space within loading tank 5 located below the sealing partition strip 6. It is filled with a specially treated insulating anti-evaporation buffer solution. This buffer solution uses deionized water as its base liquid, with 5%-8% by mass of ethylene glycol added (as an anti-evaporation agent, which raises the boiling point of the buffer solution to 120℃-135℃, preventing rapid evaporation during the initial temperature rise in the lithium battery's thermal runaway phase, ensuring the buffer solution maintains its buffering capacity during the early stages and the explosion process). Simultaneously, 2%-3% by mass of silica nanoparticles are added (as an insulating modifier, utilizing the insulating properties of silica nanoparticles and their ability to react in liquids). The dispersion stability ensures good overall insulation of the buffer solution, with a volume resistivity ≥1×10^8Ω・cm, effectively preventing secondary short circuits caused by battery short circuits or leaks due to the conductivity of the buffer solution. To further optimize the stability of the buffer solution, sodium dodecylbenzenesulfonate (0.5%-1% by mass) is added as a dispersant to ensure uniform dispersion of silica nanoparticles in the buffer solution and avoid particle agglomeration that affects insulation and buffering effects. The above components are mixed by stirring at 25℃-30℃ for 30-40 minutes at a stirring rate of 500-800r / min to prepare the required insulating anti-evaporation buffer solution. Meanwhile, a temperature-sensing trigger layer is fixedly installed on the inner wall of the sealing partition strip 6. This temperature-sensing trigger layer is made of fusible polyolefin material (melting point of 80℃-90℃). When the temperature inside the lithium battery rises to this melting point due to thermal runaway, the temperature-sensing trigger layer automatically melts. At this time, the buffer solution below the sealing partition strip 6 in the loading tank 5 can push the push plate 9 and the movable rod 8 more quickly under the pressure inside the lithium battery, so that the piercing 10 can accurately pierce the sealing partition strip 6. At the same time, with the guiding effect of the flow-blocking tube 11 (the inner wall of the flow-blocking tube 11 is provided with a spiral flow-guiding groove with a pitch of 2mm-3mm, which can guide the buffer solution to flow along a fixed path to the buffer space above the sealing partition strip 6, avoiding disordered flow of the buffer solution and resulting in a decrease in the buffering effect), the buffer solution can play a timely and stable buffering role. It should be noted that the sealing partition strip 6 is made of plastic. When the device explodes, the inside of the loading tank 5 is compressed, causing the movable rod 8 to drive the push plate 9 to push the buffer fluid. During this pushing process, the bayonet 10 comes into contact with the sealing partition strip 6 and punctures it, allowing the buffer fluid below the sealing partition strip 6 to flow to the buffer space above it. This prevents the protective cover 15 from breaking directly after the device explodes, thus providing a certain buffering force. The protective cover 15 can block the lithium battery body 4 inside the device at both ends. When the device explodes, the buffering effect of the protective cover 15 can reduce the damage range caused by the explosion of the lithium battery body 4, thereby protecting the safety of users and property.

[0019] Please see Figures 1 to 7 The thickness of the explosion-proof layer 2 is 0.5 to 1.1 cm. This thickness of the explosion-proof layer 2 and the steel cord 3 can ensure that the device does not add excessive weight while providing good protection.

[0020] Please see Figures 1 to 7 A flow-blocking tube 11 is symmetrically installed on and above the sealing partition strip 6. The flow-blocking tube 11 is a hollow cuboid with openings at both ends. The flow-blocking tube 11 corresponds to the bayonet 10. After the bayonet 10 penetrates the sealing partition strip 6, the flow-blocking tube 11 reduces the backflow of the buffer solution below the sealing partition strip 6, thereby ensuring the buffering effect on the protective cover 15.

[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium battery with explosion-proof function, characterized in that: The battery includes a lithium battery body (4), an explosion-proof layer (2) is fixedly provided on the outside of the lithium battery body (4), a protective shell (1) is fixedly provided on the outside of the explosion-proof layer (2), a loading groove (5) is symmetrically provided on the protective shell (1), a sealing partition strip (6) is fixedly installed on the inside of the loading groove (5), a rubber ring (7) is fixedly installed in the middle of the sealing partition strip (6), a movable rod (8) is inserted into the rubber ring (7), a penetrating mechanism is provided on the movable rod (8) extending to the bottom of the sealing partition strip (6), and a limiting mechanism is provided on the movable rod (8) extending to the top of the sealing partition strip (6). The penetration mechanism includes a movable rod (8) extending to a push plate (9) fixedly installed below the sealing partition strip (6), the push plate (9) being located on one side near the movable rod (8) and symmetrically equipped with bayonets (10).

2. A lithium battery with explosion-proof function according to claim 1, characterized in that: The explosion-proof layer (2) has crisscrossing steel cords (3) embedded on its inner side, and the thickness of the explosion-proof layer (2) is 0.5 to 1.1 cm.

3. A lithium battery with explosion-proof function according to claim 1, characterized in that: The explosion-proof layer (2) is composed of polyimide.

4. A lithium battery with explosion-proof function according to claim 1, characterized in that: The limiting mechanism includes a connecting block (12) that extends from the movable rod (8) and is fixedly installed above the sealing partition strip (6). A connecting strip (13) is fixedly installed at one end of the connecting block (12) away from the movable rod (8), and an end block (14) is fixedly installed at one end of the connecting strip (13) away from the connecting block (12).

5. A lithium battery with explosion-proof function according to claim 3, characterized in that: A flow-blocking tube (11) is symmetrically installed on and above the sealing partition strip (6). The flow-blocking tube (11) is composed of a hollow cuboid with openings at both ends. The flow-blocking tube (11) corresponds to the bayonet (10).

6. A lithium battery with explosion-proof function according to claim 4, characterized in that: Both ends of the protective shell (1) are provided with protective covers (15), and the protective covers (15) are inserted into the connecting strip (13).

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