Novel fast pressure relief lithium battery explosion-proof sheet

Abstract

The utility model provides a novel quick pressure relief lithium battery explosion -proof piece relates to lithium battery technical field, including explosion -proof piece body, the one end of explosion -proof piece body is established with buffer cavity, the outside of buffer cavity is provided with fire -extinguishing groove, and explosion -proof piece body is provided with the reinforcing rib in the one end of fire -extinguishing groove and buffer cavity, explosion -proof piece body's other end is provided with the setting of pressure relief groove, pressure relief pipe, closing lid, spring, telescopic block, rubber ring and exhaust groove, when lithium battery internal pressure is unusually high, through pressure relief groove guide gas enters pressure relief pipe, under the action of pressure, push telescopic block and overcome the resistance of spring and telescopic, when telescopic block pushes to certain position, gas is discharged outward through exhaust groove, when pressure recovers to normal condition, spring drives telescopic block and rubber ring and bounces back, and reseals pressure relief pipe, thereby the safety of lithium battery is improved, effectively avoid the explosion risk caused by internal pressure is too high, protect the safety of equipment and user.

Description

Technical Field

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

[0002] According to the Chinese Publication No. CN209418616U, an explosion-proof sheet for a lithium battery cover is disclosed, which relates to the technical field of lithium batteries. It solves the problem that most existing explosion-proof sheets are just a thin sheet covering the lithium battery cover. When the internal pressure of the lithium battery increases, the explosion-proof sheet will break and generate debris that will fly out rapidly. The debris can easily fall into the mechanical parts and cause inconvenience in cleaning. The key points of the technical solution are: it includes a connecting part and a pressure relief part. The connecting part and the pressure relief part are integrally set, and the connecting part is located on the circumferential outer side of the pressure relief part. The pressure relief part has an indentation set along an arc path. The indentation is located on the circumferential outer side of the pressure relief part, which can prevent the debris from flying out after the explosion-proof sheet breaks.

[0003] However, the aforementioned device has the following problem: during use, when a lithium battery explodes due to an accident such as a short circuit or overcharging, the explosion-proof sheet cannot quickly and effectively block the spread of high-temperature flames and deflagration energy. The fire often breaks through the protective barrier and spreads to the surrounding area, not only exacerbating the damage to the equipment but also triggering a chain of safety accidents. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a novel fast-release lithium battery explosion-proof sheet.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: it includes an explosion-proof sheet body, one end of which is provided with a buffer cavity, and a fire extinguishing groove is provided outside the buffer cavity. Both the fire extinguishing groove and the buffer cavity are provided at one end of the explosion-proof sheet body, and a reinforcing rib is provided at the other end of the explosion-proof sheet body.

[0006] Preferably, a feed groove is provided in the middle of the top surface of the explosion-proof plate, and a closing screw is threaded inside the feed groove.

[0007] Preferably, the bottom of the feed trough and the inner top of the fire extinguishing trough penetrate each other.

[0008] Preferably, the surface of the fire extinguishing tank is provided with a non-woven fabric layer.

[0009] Preferably, the buffer cavity is provided with two sets of pressure relief grooves, both of which penetrate the interior of the explosion-proof sheet.

[0010] Preferably, each of the two sets of pressure relief grooves is provided with a pressure relief pipe at one end, and a closed cap is provided at one end of the pressure relief pipe. The surface of the pressure relief pipe has six sets of exhaust grooves arranged in a circular array.

[0011] Preferably, a spring is provided inside one end of the closing cover, a telescopic block is provided at one end of the spring, and a rubber ring is provided around the telescopic block. The spring, telescopic block and rubber ring are all located inside the pressure relief pipe.

[0012] Beneficial effects This invention employs a pressure relief groove, a pressure relief pipe, a closing cover, a spring, a telescopic block, a rubber ring, and an exhaust channel. When the internal pressure of the lithium battery abnormally increases, gas is guided into the pressure relief pipe through the pressure relief groove. Under pressure, the telescopic block overcomes the resistance of the spring and extends outward. When the telescopic block is pushed to a certain position, the gas is discharged outward through the exhaust channel. When the pressure returns to normal, the spring drives the telescopic block and the rubber ring to rebound and reseal the pressure relief pipe, thereby improving the safety of the lithium battery, effectively avoiding the risk of explosion caused by excessive internal pressure, and protecting the safety of equipment and users.

[0013] This invention employs a fire extinguishing trough, a feeding trough, a closing screw, and a non-woven fabric layer. During use, workers can easily fill the fire extinguishing trough with fire extinguishing particles from the feeding trough, and the closing screw tightly seals the feeding trough. The non-woven fabric layer effectively blocks the fire extinguishing particles. In the event of a battery explosion, the resulting flames will quickly contact and burn through the non-woven fabric layer, causing the fire extinguishing particles in the extinguishing trough to flow out immediately and quickly cover the flames, thereby effectively preventing the fire from spreading and buying valuable time for subsequent professional firefighting work. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall appearance of the present utility model; Figure 2 This is a schematic diagram of the back of the present invention; Figure 3 This is a structural diagram of the fire extinguishing tank, non-woven fabric layer, and closing screw of this utility model; Figure 4 This is a structural diagram of the pressure relief pipe, closing cap, spring, and telescopic block of this utility model.

[0015] Legend: 1. Explosion-proof sheet; 2. Buffer cavity; 3. Fire extinguishing tank; 4. Reinforcing rib; 5. Pressure relief tank; 6. Pressure relief pipe; 7. Closing screw; 8. Non-woven fabric layer; 9. Spring; 10. Telescopic block; 11. Rubber ring; 12. Feed chute; 13. Closing cover; 14. Venting tank. Detailed Implementation

[0016] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0017] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1: Reference Figure 1-4 A novel fast-release lithium battery explosion-proof sheet includes an explosion-proof sheet body 1, which adopts an integrated design. One end of the explosion-proof sheet body 1 has a buffer cavity 2, which provides an initial buffer space when the internal pressure of the battery increases. The buffer cavity 2 is provided with a fire extinguishing groove 3 for storing fire extinguishing particles. Both the fire extinguishing groove 3 and the buffer cavity 2 are integrated at one end of the explosion-proof sheet body 1, and the fire extinguishing groove 3 is arranged around the buffer cavity 2. The other end of the explosion-proof sheet body 1 is provided with a reinforcing rib 4, which includes multiple transverse reinforcing ribs and multiple longitudinal reinforcing ribs. The multiple transverse reinforcing ribs and multiple longitudinal reinforcing ribs are arranged alternately to enhance the overall structural strength and deformation resistance of the explosion-proof sheet.

[0019] A feeding groove 12 is provided in the middle of the top surface of the explosion-proof disc 1. A closing screw 7 is threaded inside the feeding groove 12 to ensure a tight seal at the connection between the closing screw 7 and the feeding groove 12. The bottom of the feeding groove 12 and the inner top of the extinguishing tank 3 penetrate each other to form a filling channel for the extinguishing particles. A non-woven fabric layer 8 is provided on the surface of the extinguishing tank 3 to temporarily store the extinguishing particles and break them under the action of flame combustion. Two sets of pressure relief grooves 5 are provided inside the buffer cavity 2. Both sets of pressure relief grooves 5 penetrate the interior of the explosion-proof disc 1 to form a pressure relief channel. A pressure relief pipe 6 is provided at one end of each set of pressure relief grooves 5. The connection between the pressure relief pipe 6 and the pressure relief groove 5 is welded. A closing cap 13 is provided at one end of the pressure relief pipe 6 to close the pressure relief pipe 6 under normal conditions and relieve pressure. The connection between pipe 6 and closing cover 13 is also welded to ensure sealing. Six sets of circular array exhaust grooves 14 are evenly distributed on the surface of pressure relief pipe 6 to disperse the pressure relief gas. A spring 9 is installed inside one end of closing cover 13, and a telescopic block 10 is installed at one end of spring 9. A rubber ring 11 is arranged around the periphery of telescopic block 10. Spring 9, telescopic block 10 and rubber ring 11 are all arranged inside pressure relief pipe 6 to form a resettable pressure relief valve. The outer wall of rubber ring 11 is tightly fitted to the inside of pressure relief pipe 6 to prevent pressure from leaking from inside pressure relief pipe 6 under normal pressure. Pressure relief groove 5 and pressure relief pipe 6 are two sets of symmetrical design to improve pressure relief efficiency. The entire explosion-proof sheet is coated with an anti-rust layer to extend the overall service life. Specific Implementation Example 2: A novel rapid-release lithium battery explosion-proof sheet, further based on the basic structure in Specific Embodiment 1, operates as follows: First, the increased internal pressure acts on the buffer cavity 2, providing initial buffer space. Subsequently, the pressure further acts on the pressure relief groove 5, guiding the internal gas into the pressure relief pipe 6. As the pressure continues to rise, the telescopic block 10 inside the pressure relief pipe 6 overcomes the elastic force of the spring 9 and moves outward, causing the telescopic block 10 and the rubber ring 11 to extend and retract together, thereby opening the pressure relief pipe 6 and allowing the high-pressure gas to be discharged through the exhaust groove 14, achieving rapid pressure relief. When the lithium battery accidentally explodes and produces flames, the flames will burn through the non-woven fabric layer 8 on the surface of the fire extinguishing groove 3, causing the fire extinguishing particles pre-filled in the fire extinguishing groove 3 to flow out and cover the flame surface, effectively blocking the spread of fire and buying valuable time for subsequent fire extinguishing work. After the pressure relief is completed, the elastic force of the spring 9 will reset the telescopic block 10, resealing the pressure relief pipe 6.

[0021] In summary: The system employs a pressure relief groove 5, a pressure relief pipe 6, a closing cover 13, a spring 9, a telescopic block 10, a rubber ring 11, and an exhaust groove 14. When the internal pressure of the lithium battery rises abnormally, gas is guided into the pressure relief pipe 6 through the pressure relief groove 5. Under pressure, the telescopic block 10 overcomes the resistance of the spring 9 and extends outward. When the telescopic block 10 is pushed to a certain position, the gas is discharged outward through the exhaust groove 14. When the pressure returns to normal, the spring 9 drives the telescopic block 10 and the rubber ring 11 to rebound and reseal the pressure relief pipe 6, thereby improving the safety of the lithium battery, effectively avoiding the risk of explosion caused by excessive internal pressure, and protecting the safety of equipment and users. The system employs a fire extinguishing trough 3, a feeding trough 12, a closing screw 7, and a non-woven fabric layer 8. During use, personnel can easily fill the fire extinguishing trough 3 with fire extinguishing particles from the feeding trough 12, and the closing screw 7 tightly seals the feeding trough 12. The non-woven fabric layer 8 effectively blocks the fire extinguishing particles. In the event of a battery explosion, the resulting flames will quickly contact and burn through the non-woven fabric layer 8, causing the fire extinguishing particles in the fire extinguishing trough 3 to immediately flow out and quickly cover the flames, thereby effectively preventing the fire from spreading and buying valuable time for subsequent professional firefighting work.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel fast-release lithium battery explosion-proof sheet, comprising an explosion-proof sheet body (1), characterized in that: One end of the explosion-proof sheet (1) is provided with a buffer cavity (2), and a fire extinguishing groove (3) is provided outside the buffer cavity (2). Both the fire extinguishing groove (3) and the buffer cavity (2) are provided at one end of the explosion-proof sheet (1), and the fire extinguishing groove (3) is arranged around the buffer cavity (2). The surface of the fire extinguishing groove (3) is provided with a non-woven fabric layer (8). The other end of the explosion-proof sheet (1) is provided with a reinforcing rib (4). A feeding groove (12) is provided in the middle of the top surface of the explosion-proof sheet (1). The bottom of the feeding groove (12) and the inner top of the fire extinguishing groove (3) penetrate each other.

2. The novel fast-release lithium battery explosion-proof sheet according to claim 1, characterized in that: The feed trough (12) has a closed screw (7) connected to its internal thread.

3. The novel fast-release lithium battery explosion-proof sheet according to claim 1, characterized in that: The buffer cavity (2) is provided with two sets of pressure relief grooves (5), and both sets of pressure relief grooves (5) penetrate the interior of the explosion-proof sheet (1).

4. The novel fast-release lithium battery explosion-proof sheet according to claim 3, characterized in that: Both sets of pressure relief grooves (5) are provided with a pressure relief pipe (6) at one end, and a closing cap (13) is provided at one end of the pressure relief pipe (6).

5. A novel fast-release lithium battery explosion-proof sheet according to claim 4, characterized in that: The surface of the pressure relief pipe (6) has a circular array of six sets of exhaust grooves (14).

6. The novel fast-release lithium battery explosion-proof sheet according to claim 4, characterized in that: A spring (9) is provided inside one end of the closed cover (13), and a telescopic block (10) is provided at one end of the spring (9). A rubber ring (11) is provided around the telescopic block (10). The spring (9), the telescopic block (10) and the rubber ring (11) are all provided inside the pressure relief pipe (6) to form a pressure relief valve.

7. The novel fast-release lithium battery explosion-proof sheet according to claim 3, characterized in that: The reinforcing rib (4) includes multiple transverse reinforcing ribs and multiple longitudinal reinforcing ribs, which are arranged alternately.

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