A latching type metal explosion-proof valve

Abstract

The utility model provides a kind of metal explosion-proof valve of locking, including explosion-proof valve main body, explosion-proof valve main body includes valve body, the top of valve body is equipped with a top cover, it is equipped with a magnetic attraction piece between valve body and top cover, magnetic attraction piece is attached in the inside of top cover, top cover and valve body are also equipped with a bracket between, the upper surface of bracket is equipped with a breathable film, breathable film is located below magnetic attraction piece, bracket and top cover interference fit;The upper surface of valve body is equipped with first annular groove, first annular groove is embedded with inner sealing ring, inner sealing ring is located at the junction of bracket and valve body, the lower connection exhaust column of valve body, the bottom of bracket is equipped with a threaded column, threaded column passes through the center of valve body, the top of exhaust column and threaded column are screwed, spring is inserted on exhaust column, the sidewall groove of exhaust column is embedded with snap spring, the outside of exhaust column is equipped with protective sleeve, and the end of protective sleeve is interference fit in the lower end of main body.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof valves, specifically to a locking type metal explosion-proof valve. Background Technology

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

[0003] A power battery explosion-proof valve is a critical safety device used to prevent battery explosions under abnormal conditions. Its working principle is primarily based on releasing internal pressure when it rises to a certain level, thus preventing an explosion. The valve allows free flow of gas inside and outside the battery pack, maintaining pressure balance. When the internal gas pressure is greater than the ambient pressure, the gas is released; conversely, external gas enters the pack, maintaining pressure equilibrium. In the event of thermal runaway, internal chemical reactions produce a large amount of gas, causing a rapid increase in pressure. The explosion-proof valve, located on the battery casing, opens when the pressure exceeds a set value, releasing internal pressure and preventing an explosion.

[0004] The existing technical structure has certain defects. After the pressure relief is opened, the explosion-proof valve will automatically return to its original position. 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 cell will produce dust or other impurities, and the repeated movement of the explosion-proof valve may cause blockage, preventing it from reaching the maximum opening height, thus affecting the exhaust performance and pressure relief effect. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model provides a locking metal explosion-proof valve to solve the problems of at least one of the above-mentioned technologies.

[0006] The technical solution of this utility model is: a locking type metal explosion-proof valve, including an explosion-proof valve body, characterized in that the explosion-proof valve body includes a valve body, a top cover is provided on the top of the valve body, a magnetic suction piece is provided between the valve body and the top cover, the magnetic suction piece is attached to the inside of the top cover, a bracket is also provided between the top cover and the valve body, a breathable membrane is provided on the upper surface of the bracket, the breathable membrane is located below the magnetic suction piece, and the bracket is interference-fitted with the top cover;

[0007] The upper surface of the valve body is provided with a first annular groove, and an inner sealing ring is embedded in the first annular groove. The inner sealing ring is located at the connection between the bracket and the valve body. An exhaust column is connected to the lower part of the valve body. A threaded column is provided at the bottom of the bracket. The threaded column passes through the center of the valve body. The top of the exhaust column is screwed to the threaded column. A spring is fitted on the exhaust column. A retaining spring is embedded in the side wall groove of the exhaust column. A protective sleeve is fitted on the outer side of the exhaust column. The end of the protective sleeve is interference-fitted to the lower end of the main body.

[0008] This invention allows for free flow of gas between the battery pack and the outside, provided the internal pressure of the battery pack casing is less than the burst pressure set by the explosion-proof valve. Gas flows freely from the side with higher pressure to the side with lower pressure. When the internal pressure of the battery pack casing is greater than or equal to the burst pressure set by the explosion-proof valve, but less than the locking pressure, the internal pressure forces open the support, allowing gas to flow directly to the outside through an unobstructed channel, achieving rapid gas discharge and quickly reducing the internal pressure to prevent the battery pack from exploding. The explosion-proof device functions under these conditions. When the internal pressure of the battery pack casing is greater than or equal to the locking pressure set by the explosion-proof valve, the internal pressure will be very high. This pressure will push the bracket out to a certain height, and the exhaust column will also move upwards until the side spring groove of the exhaust column is on the same horizontal plane as the side groove of the main body hole. At this point, the spring will spring out and fall into the side groove of the main body hole, causing the bracket and exhaust column to stop moving, thus achieving the limiting function. The bracket and top cover assembly will no longer return to their original positions, and the explosion-proof valve will remain open. Gas will continuously be discharged through the open position of the explosion-proof valve, thereby continuously and effectively reducing the internal pressure of the casing and preventing the battery pack from exploding. At the same time, the valve remains open to prevent some high-temperature gas from remaining and not being able to be discharged, thus preventing high-temperature reignition.

[0009] More preferably, the surface of the bracket is provided with a slot for accommodating the breathable membrane, and the surface of the breathable membrane is flush with the opening of the slot.

[0010] This can optimize the stability of the breathable membrane.

[0011] In a further preferred embodiment, the side wall of the exhaust column is provided with an annular groove with the opening direction facing outward, and the retaining spring is embedded in the annular groove.

[0012] The release of the retaining ring prevents the bracket and exhaust column from moving, thus achieving the function of limiting movement.

[0013] Further preferably, the lower surface of the valve body is provided with a second annular groove opening downwards, and an outer sealing ring is embedded in the second annular groove. The outer sealing ring is located at the connection between the protective sleeve and the valve body. This can better ensure sealing performance.

[0014] Further preferably, the outer contour of the outer sealing ring is larger than the outer contour of the inner sealing ring.

[0015] Different sizes of sealing rings can achieve different sealing effects. Attached Figure Description

[0016] Figure 1 This is an exploded view of the present invention;

[0017] Figure 2 This is an exploded view of the top cover and magnetic absorbing sheet of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the top cover and magnetic sheet of this utility model;

[0019] Figure 4 This is an exploded view of the bracket and breathable membrane of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the support and breathable membrane of this utility model;

[0021] Figure 6 This is an exploded view of the main body and inner sealing ring of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the main body and the inner sealing ring of this utility model;

[0023] Figure 8 This is an exploded view of the bracket and top cover of this utility model;

[0024] Figure 9 This is a schematic diagram of the structure of the bracket and top cover of this utility model;

[0025] Figure 10 This is an exploded view of the bracket and main body of this utility model;

[0026] Figure 11 This is a schematic diagram of the air permeability state under normal pressure of this utility model;

[0027] Figure 12 A diagram showing the state of the pressure reaching the set burst value of the explosion-proof valve according to this utility model;

[0028] Figure 13 This diagram shows the state when the pressure reaches the check pressure of the explosion-proof valve.

[0029] In the diagram: 1. Top cover; 2. Magnetic plate; 3. Breathable membrane; 4. Bracket; 5. Inner sealing ring; 6. Valve body; 7. Outer sealing ring; 8. Snap ring; 9. Spring; 10. Exhaust column; 11. Protective cover. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] like Figures 1-13 As shown, a snap-lock metal explosion-proof valve includes an explosion-proof valve body, which includes a valve body 6. A top cover 1 is provided on the top of the valve body. A magnetic absorbing piece 2 is provided between the valve body and the top cover, and the magnetic absorbing piece is attached to the inside of the top cover. A bracket 4 is also provided between the top cover and the valve body. A breathable membrane 3 is provided on the upper surface of the bracket, and the breathable membrane is located below the magnetic absorbing piece. The bracket and the top cover are interference-fitted. A first annular groove is provided on the upper surface of the valve body. An inner sealing ring 5 is embedded in the first annular groove. The inner sealing ring is located at the connection between the bracket and the valve body. An exhaust column 10 is connected to the bottom of the valve body. A threaded column is provided at the bottom of the bracket. The threaded column passes through the center of the valve body. The top of the exhaust column is screwed to the threaded column. A spring 9 is fitted on the exhaust column. A retaining spring 8 is embedded in the side wall groove of the exhaust column. A protective sleeve 11 is fitted on the outside of the exhaust column. The end of the protective sleeve is interference-fitted to the lower end of the main body.

[0032] This invention allows for free flow of gas between the battery pack and the outside, provided the internal pressure of the battery pack casing is less than the burst pressure set by the explosion-proof valve. Gas flows freely from the side with higher pressure to the side with lower pressure. When the internal pressure of the battery pack casing is greater than or equal to the burst pressure set by the explosion-proof valve, but less than the locking pressure, the internal pressure forces open the support, allowing gas to flow directly to the outside through an unobstructed channel, achieving rapid gas discharge and quickly reducing the internal pressure to prevent the battery pack from exploding. The explosion-proof device functions under these conditions. When the internal pressure of the battery pack casing is greater than or equal to the locking pressure set by the explosion-proof valve, the internal pressure will be very high. This pressure will push the bracket out to a certain height, and the exhaust column will also move upwards until the side spring groove of the exhaust column is on the same horizontal plane as the side groove of the main body hole. At this point, the spring will spring out and fall into the side groove of the main body hole, causing the bracket and exhaust column to stop moving, thus achieving the limiting function. The bracket and top cover assembly will no longer return to their original positions, and the explosion-proof valve will remain open. Gas will continuously be discharged through the open position of the explosion-proof valve, thereby continuously and effectively reducing the internal pressure of the casing and preventing the battery pack from exploding. At the same time, the valve remains open to prevent some high-temperature gas from remaining and not being able to be discharged, thus preventing high-temperature reignition.

[0033] Further optimized, the surface of the support has a slot for accommodating the breathable membrane, with the surface of the breathable membrane flush with the opening of the slot. This improves the stability of the breathable membrane.

[0034] In a further preferred embodiment, the side wall of the exhaust column is provided with an annular groove with its opening facing outward, and a retaining spring is embedded in the annular groove. The release of the retaining spring prevents the bracket and exhaust column from moving, thus achieving a limiting function.

[0035] Further preferably, the lower surface of the valve body is provided with a second annular groove opening downwards, and an outer sealing ring 7 is embedded in the second annular groove. The outer sealing ring is located at the connection between the protective sleeve and the valve body. This can better ensure the sealing performance.

[0036] Further optimization involves ensuring that the outer contour of the outer sealing ring is larger than that of the inner sealing ring. Different sizes of sealing rings can achieve different sealing effects.

[0037] The above are merely preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A locking type metal explosion-proof valve, comprising an explosion-proof valve body, characterized in that, The explosion-proof valve body includes a valve body, a top cover on the top of the valve body, a magnetic absorbing piece between the valve body and the top cover, the magnetic absorbing piece being attached to the inside of the top cover, a bracket between the top cover and the valve body, a breathable membrane on the upper surface of the bracket, the breathable membrane being located below the magnetic absorbing piece, and the bracket being interference-fitted with the top cover. The upper surface of the valve body is provided with a first annular groove, and an inner sealing ring is embedded in the first annular groove. The inner sealing ring is located at the connection between the bracket and the valve body. An exhaust column is connected to the lower part of the valve body. A threaded column is provided at the bottom of the bracket. The threaded column passes through the center of the valve body. The top of the exhaust column is screwed to the threaded column. A spring is fitted on the exhaust column. A retaining spring is embedded in the side wall groove of the exhaust column. A protective sleeve is fitted on the outer side of the exhaust column. The end of the protective sleeve is interference-fitted to the lower end of the main body.

2. The locking type metal explosion-proof valve according to claim 1, characterized in that: The surface of the bracket is provided with a slot for accommodating the breathable membrane, and the surface of the breathable membrane is flush with the opening of the slot.

3. A locking type metal explosion-proof valve according to claim 1, characterized in that: The side wall of the exhaust column is provided with an annular groove with the opening direction facing outward, and the retaining spring is embedded in the annular groove.

4. A locking type metal explosion-proof valve according to claim 1, characterized in that: The lower surface of the valve body is provided with a second annular groove with an opening facing downwards. An outer sealing ring is embedded in the second annular groove, and the outer sealing ring is located at the connection between the protective sleeve and the valve body.

5. A locking type metal explosion-proof valve according to claim 4, characterized in that: The outer contour of the outer sealing ring is larger than the outer contour of the inner sealing ring.

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