Novel anti-explosion valve with non-return structure

Abstract

The utility model discloses a novel anti-explosion valve with a non-return structure. The novel anti-explosion valve comprises a top cover, a magnetic piece, a breathable film, a support, an inner sealing ring, a main body, an outer sealing ring, a spring, an exhaust column and a protective sleeve. An elastic sheet is also included; the elastic sheet comprises an annular fixed sheet and a plurality of movable sheets which are uniformly distributed along the periphery of the annular fixed sheet; the inner side edges of the movable pieces are rotatably fixed to the outer edge of the annular fixed piece, and when the movable pieces are not stressed, the movable pieces can reset and bend in the same direction. The central hole of the annular fixing sheet of the elastic sheet is sleeved on the threaded column of the bracket; a main body center hole is formed in the center of the main body, and a plurality of main body rib positions in one-to-one correspondence with the movable pieces are arranged on the periphery of the main body center hole; an elastic sheet non-return clamping groove is formed in each main body rib position; the non-return function of the anti-explosion valve is added, the pressure relief capacity is enhanced, the possibility of failure and blockage of the anti-explosion valve can be avoided, and the stability is improved.

Description

Technical Field

[0001] The utility model relates to an explosion-proof valve, in particular to a novel explosion-proof valve with a check structure. Background Art

[0002] Power batteries are core components of new energy vehicles, such as electric vehicles. They convert electrical energy into chemical energy through chemical reactions for storage, and convert the chemical energy back into electrical energy when needed to power the vehicle. A control system drives the electric motor to rotate the wheels, propelling the vehicle forward. They are used not only in electric vehicles but also in energy storage systems. By storing electrical energy, power batteries can release it when needed to supply homes, industries, and even the power grid, improving energy efficiency and balancing the gap between energy supply and demand.

[0003] The explosion-proof valve of a power battery is a key safety device used to prevent the battery from exploding under abnormal circumstances. Its working principle is mainly to prevent the battery from exploding by releasing the internal pressure when the internal pressure of the battery rises to a certain level; the function of the explosion-proof valve is to allow the gas inside and outside the battery pack to circulate freely, achieving a balance of internal and external air pressure. When the gas pressure inside the battery pack is greater than the ambient air pressure, the gas is discharged to the outside; conversely, the external gas enters the box to maintain the air pressure balance; when the battery experiences thermal runaway, the internal chemical reaction will produce a large amount of gas, causing the pressure to rise sharply. The explosion-proof valve is designed on the battery shell. When the pressure exceeds the set value, the explosion-proof valve will be pushed open, releasing the internal pressure and preventing the battery from exploding.

[0004] The existing technical structure has certain defects. After opening to release pressure, the explosion-proof valve will automatically recover. If there is still high-temperature and high-pressure gas in the box, it cannot be effectively and continuously discharged, which may lead to the potential danger of high-temperature re-ignition. In the event of thermal runaway, the combustion of the battery core will produce dust or other impurities, and the repeated movement of the explosion-proof valve may cause blockage, and it cannot reach the maximum opening height, affecting the exhaust performance and pressure relief effect. Utility Model Content

[0005] In response to the problems existing in the prior art, the utility model provides a new type of non-return structure explosion-proof valve, which increases the non-return function of the explosion-proof valve, enhances the pressure relief capacity, avoids the possibility of failure and blockage of the explosion-proof valve, and increases stability.

[0006] The technical solution of the utility model is: a new type of non-return structure explosion-proof valve, including a top cover, a magnetic sheet, a breathable membrane, a bracket, an inner sealing ring, a main body, an outer sealing ring, a spring, an exhaust column and a protective cover;

[0007] It also includes shrapnel;

[0008] The spring piece includes an annular fixed piece and a plurality of movable pieces evenly distributed along the periphery of the annular fixed piece; the inner side edge of the movable piece is rotatably fixed to the outer edge of the annular fixed piece, and when the plurality of movable pieces are not subjected to force, they can bend back in the same direction; the outer ends of one or more movable pieces are provided with inwardly facing protrusions at both ends to form a limit buckle structure;

[0009] The center hole of the annular fixing plate of the elastic piece is sleeved on the threaded column of the bracket;

[0010] The center of the main body is provided with a main body center hole, and the periphery of the main body center hole is provided with a plurality of main body ribs corresponding to the movable pieces one by one; each main body rib is provided with a spring piece non-return slot;

[0011] When the threaded column of the bracket passes through the center hole of the main body and the bracket is close to the main body, the multiple movable pieces of the spring can be pressed and fitted one by one on the surfaces of multiple main body ribs, and the limiting snap-in structure is limited and clamped on both sides of the main body ribs; when the bracket is away from the main body, the multiple movable pieces of the spring can be reset and bent and be locked and stopped when the outer edge of the movable piece moves to the spring piece non-return slot.

[0012] Furthermore, the magnetic sheet is attached to the inner side of the top cover to form a top cover assembly;

[0013] The breathable membrane is applied to the corresponding slot of the bracket to form a bracket assembly;

[0014] The bracket assembly and the top cover assembly are press-fitted together by interference fit;

[0015] The inner sealing ring and the outer sealing ring are installed in the corresponding sealing ring grooves on the inner and outer surfaces of the main body;

[0016] The spring piece can be inserted into the assembled bracket assembly, and then pressed into the main body, pressing the inner sealing ring on the main body;

[0017] Insert the spring into the exhaust column, and use the threaded connection between the exhaust column and the threaded column on the back of the bracket to fix the main body and the bracket assembly together;

[0018] Press the protective cover into the corresponding protective cover docking slot of the main body through interference fit. The assembly is complete.

[0019] The beneficial effects of the utility model are: providing a novel non-return structure explosion-proof valve, increasing the non-return function of the product through the spring piece, and realizing a more stable pressure relief function and effect than the existing technology.

[0020] Reduce the risk of product failure in existing structures. For example, if the battery box fails, it will generate dust and other impurities. The existing structure's repeated movement during operation may cause blockage due to dust accumulation. The optimized structure now prevents the explosion-proof valve from clogging due to the spring clip when the failure pressure is reached. This implements a check function, allowing the explosion-proof valve to continue to effectively exhaust air, enhance the stability of pressure relief, and strengthen its protective performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the exploded view of the new type of check structure explosion-proof valve product;

[0022] Figure 2 Schematic diagram of sticking magnetic sheet to the top cover;

[0023] Figure 3 Schematic diagram of affixing a breathable film to the bracket;

[0024] Figure 4 Schematic diagram of installing the inner sealing ring for the main body;

[0025] Figure 5 Schematic diagram of the riveted top cover assembly and the bracket assembly;

[0026] Figure 6 Schematic diagram for installing the main assembly, bracket assembly, and spring clip;

[0027] Figure 7 It is a schematic diagram of shrapnel;

[0028] Figure 8 Schematic diagram for installing the spring, exhaust column, main body, top cover assembly and bracket assembly;

[0029] Figure 9 Schematic diagram of the installation of protective cover, exhaust column and assembly components;

[0030] Figure 10 This is a schematic diagram of the ventilation of the new check-type explosion-proof valve under normal pressure;

[0031] Figure 11 Schematic diagram of the explosion-proof valve opening when the pressure reaches the explosion value set for the explosion-proof valve;

[0032] Figure 12 When the pressure reaches the check pressure of the explosion-proof valve, the explosion-proof valve will remain open and will not return to normal operation.

[0033] In the figure: 1 is the top cover, 2 is the magnetic sheet, 3 is the breathable membrane, 4 is the bracket, 5 is the spring, 6 is the inner sealing ring, 7 is the main body, 8 is the outer sealing ring, 9 is the spring, 10 is the exhaust column, 11 is the protective cover, 12 is the top cover assembly, 13 is the bracket assembly, 14 is the main body rib position, 15 is the spring non-return slot, 16 is the main body center hole, 17 is the assembly after the bracket assembly and the top cover assembly are assembled, 18 is the annular fixing plate, 19 is the movable plate, 20 is the assembly after the bracket assembly, the top cover assembly and the main body are assembled, and 21 is the limiting buckle structure. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, a new type of non-return structure explosion-proof valve includes a top cover 1, a magnetic sheet 2, a breathable membrane 3, a bracket 4, a spring 5, an inner sealing ring 6, a main body 7, an outer sealing ring 8, a spring 9, an exhaust column 10 and a protective cover 11.

[0036] like Figure 2 As shown, the magnetic sheet 2 is attached to the inner side of the top cover 1 to form a top cover assembly 12 .

[0037] like Figure 3 As shown, the breathable membrane 3 is attached to the corresponding slot of the bracket 4 to form a bracket assembly 13.

[0038] like Figure 5 As shown, the bracket assembly 13 and the top cover assembly 12 are press-fitted together by interference fit.

[0039] like Figure 4 As shown, the inner sealing ring 6 and the outer sealing ring 8 are installed in the corresponding sealing ring grooves on the inner and outer surfaces of the main body 7.

[0040] like Figure 6 、 7As shown, the spring piece 5 can be inserted into the installed bracket assembly 13, and then pressed into the main body 7, pressing the inner sealing ring 6 on the main body 7. Specifically, the spring piece 5 includes an annular fixing piece 18 and four movable pieces 19 evenly distributed along the periphery of the annular fixing piece 18. The inner side edge of the movable piece 19 can be rotatably fixed to the outer edge of the annular fixing piece 18, and when the four movable pieces 19 are not under force, they can bend back in the same direction. Both ends of the outer side edge of a movable piece 19 are provided with protrusions facing inward to form a limiting snap-on structure 21. The center hole of the annular fixing piece 18 of the spring piece 5 is sleeved on the threaded column of the bracket 4. A main body center hole 16 is provided in the center of the main body 7, and four main body ribs 14 corresponding to the movable pieces 19 are provided on the periphery of the main body center hole 16. A spring piece check groove 15 is provided on each main body rib 14. When the threaded post of the bracket 4 passes through the center hole 16 of the main body and the bracket 4 is in close contact with the main body 7, the four movable pieces 19 of the spring piece 5 can be pressed against the surfaces of the four main body ribs 14 in a one-to-one correspondence, and the position-limiting buckle structure 21 is positioned and locked on both sides of the main body ribs 14. When the bracket 4 is away from the main body 7, the multiple movable pieces 19 of the spring piece 5 can bend back and forth and engage the spring piece anti-return groove 15 when the outer edge of the movable piece 19 moves to prevent return.

[0041] like Figure 8 As shown, the spring 9 is inserted into the exhaust column 10, and the exhaust column 10 is connected to the threaded column on the back of the bracket 4 to fix the main body 7 and the bracket assembly 13 together.

[0042] like Figure 9 As shown, the protective cover 11 is interference-fitted and pressed into the corresponding protective cover docking slot of the main body 7. The assembly is completed.

[0043] Function implementation process and purpose:

[0044] 1. Under the premise that the internal pressure of the battery pack is lower than the explosion value set by the explosion-proof valve, the gas inside and outside the battery pack can flow freely through the waterproof and breathable membrane built into the valve body, and the gas flows from the side with higher pressure to the side with lower pressure (such as Figure 10 As indicated by arrow A), when the internal pressure of the battery pack is greater than or equal to the explosion value set by the explosion-proof valve, but less than the locking pressure, the internal pressure pushes the bracket open (such as Figure 11 At the point indicated by arrow B), the gas will flow directly to the outside through an unobstructed channel, achieving rapid gas discharge, thereby quickly reducing the pressure inside the box and preventing the battery pack from exploding. The explosion-proof device plays an explosion-proof role in this state.

[0045] 2. When the internal pressure of the battery pack is greater than or equal to the set stop pressure of the explosion-proof valve, the internal pressure will be very high, and the pressure will push the bracket to a certain height. The spring will lose its pressure and rebound. During the rebound process, one end of the spring will fall into the slot to achieve the limit function. The bracket and top cover assembly will no longer recover, and the explosion-proof valve will remain open. The gas will continue to be discharged through the open position of the explosion-proof valve (such as Figure 12 Arrow C indicates the position where the pressure in the box is continuously and effectively reduced to prevent the battery pack from exploding. At the same time, the valve body is always open to prevent some high-temperature gases from being retained and unable to be discharged, thus preventing high-temperature re-ignition.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A novel non-return explosion-proof valve, comprising a top cover (1), a magnetic sheet (2), a breathable membrane (3), a bracket (4), an inner sealing ring (6), a main body (7), an outer sealing ring (8), a spring (9), an exhaust column (10) and a protective cover (11); Its characteristics are: Also includes shrapnel (5); The spring piece (5) includes an annular fixed piece (18) and a plurality of movable pieces (19) uniformly distributed along the periphery of the annular fixed piece (18); the inner side edge of the movable piece (19) can be rotatably fixed to the outer edge of the annular fixed piece (18), and when the plurality of movable pieces (19) are not subjected to force, they can bend back in the same direction; and the two ends of the outer side edge of one or more movable pieces (19) are provided with protrusions facing inward to form a limit buckle structure (21); The center hole of the annular fixing plate (18) of the elastic plate (5) is sleeved on the threaded column of the bracket (4); The main body (7) is provided with a main body center hole (16) at its center, and a plurality of main body ribs (14) corresponding to the movable pieces (19) are provided on the periphery of the main body center hole (16); each main body rib (14) is provided with a spring plate non-return slot (15); When the threaded column of the bracket (4) passes through the center hole (16) of the main body and the bracket (4) and the main body (7) are close to each other, the multiple movable pieces (19) of the spring piece (5) can be pressed and fitted on the surfaces of the multiple main body ribs (14) one by one, and the limiting buckle structure (21) is limited and clamped on both sides of the main body ribs (14); when the bracket (4) is away from the main body (7), the multiple movable pieces (19) of the spring piece (5) can be reset and bent and be clamped when the outer edge of the movable piece (19) moves to the spring piece non-return clamping groove (15).

2. The novel non-return explosion-proof valve according to claim 1 is characterized in that: The magnetic sheet (2) is attached to the inner side of the top cover (1) to form a top cover assembly (12); The breathable membrane (3) is applied to the corresponding slot of the bracket (4) to form a bracket assembly (13); The bracket assembly (13) and the top cover assembly (12) are press-fitted together by interference fit; The inner sealing ring (6) and the outer sealing ring (8) are installed in corresponding sealing ring grooves on the inner and outer surfaces of the main body (7); The spring piece (5) can be inserted into the installed bracket assembly (13), and then pressed into the installed main body (7), pressing the inner sealing ring (6) on the main body (7); Insert the spring (9) into the exhaust column (10), and use the threaded connection between the exhaust column (10) and the threaded column on the back of the bracket (4) to fix the main body (7) and the bracket assembly (13) together; The protective sleeve (11) is interference-fitted and pressed into the protective sleeve docking slot corresponding to the main body (7).

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