Explosion-proof valve with new pressure relief structure

Abstract

The utility model discloses a novel explosion -proof valve of pressure -relief structure, including valve body, guide rod, reset mechanism, inner sealing element, piston, waterproof air permeable membrane, be equipped with pressure -relief hole on the valve body, and the guide rod passes through the valve body and is screwed with the piston, and the guide rod and piston are correspondingly equipped with the air passage of intercommunication, and the waterproof air permeable membrane is correspondingly equipped on the piston, inner sealing element is correspondingly equipped on the valve body, and is located between the valve body and the piston, and one end of reset mechanism acts on the guide rod, and the other end acts on the valve body, and the guide rod is made the piston close inner sealing element tightly with the effort of exerting force, the utility model discloses on the basis of traditional scheme has increased the new pressure -relief mode two mutual complementation, guarantees the effectiveness of battery pack pressure -relief function under the condition of the failure of a mode, safety, adaptability and life, especially under the critical equipment or harsh working condition, the value is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to an explosion-proof valve with a novel pressure relief structure. Background Technology

[0002] With the popularization and development of new energy vehicle technology, battery safety is receiving increasing attention. Batteries contain a large number of chemical substances, which generate mixed gases during charging and discharging. This causes gas accumulation and expansion within the sealed cavity. If the pressure is not released in time, it severely affects battery life and can even lead to explosions. During transportation, energy devices carrying batteries are subject to pressure differences due to altitude, creating negative pressure differences within the device's cavity. The sealed cavity needs to balance these internal and external pressure differences in a timely manner to prevent condensation caused by external moisture intrusion, which can lead to insulation failure, short circuits, and fires. During the thermal runaway and thermal diffusion stages of the battery cells, a rapid pressure relief mechanism is required to release the high-temperature, high-pressure gases within the battery pack to meet national standards, protect the safety of passengers, and reduce economic and property losses. Utility Model Content

[0003] The technical problem to be solved by this utility model embodiment is to provide a novel explosion-proof valve with a pressure relief structure to ensure battery safety.

[0004] To address the aforementioned technical problems, this utility model proposes a novel explosion-proof valve with a pressure relief structure, comprising a valve body, a guide rod, a reset mechanism, an inner seal, a piston, and a waterproof and breathable membrane. The valve body has a pressure relief hole, the guide rod passes through the valve body and is screwed to the piston, and the guide rod and piston have corresponding communicating air passages. The waterproof and breathable membrane is correspondingly disposed on the piston. The inner seal is correspondingly disposed on the valve body and located between the valve body and the piston. One end of the reset mechanism acts on the guide rod, and the other end acts on the valve body, applying a force to the guide rod to make the piston tightly adhere to the inner seal.

[0005] Furthermore, the valve body is provided with a groove corresponding to the inner seal, and the inner seal is correspondingly disposed in the groove.

[0006] Furthermore, the slot is wider at the bottom and narrower at the top, and the inner seal is wider at the bottom and narrower at the top.

[0007] Furthermore, the bottom of the inner seal is provided with several venting grooves.

[0008] Furthermore, the exhaust channel is inverted V-shaped.

[0009] Furthermore, the valve body is equipped with a bearing, and the guide rod passes through the bearing on the valve body and is screwed to the piston. The bearing is a plastic bearing.

[0010] Furthermore, it also includes a pressure ring, through which a waterproof and breathable membrane is mounted on the piston.

[0011] Furthermore, the piston is provided with an overflow groove, a waterproof and breathable membrane is provided at the bottom of the overflow groove, the piston is provided with a piston cover, and a venting groove is provided on the piston to connect the overflow groove and the outside.

[0012] Furthermore, an external seal is provided on the valve body.

[0013] Furthermore, the reset mechanism is a spring, which is fitted onto the guide rod, and a protective sleeve is provided on the outside of the guide rod.

[0014] The beneficial effects of this utility model are as follows: This utility model can block external water vapor, can balance the pressure difference between the inside and outside of the sealed cavity in a timely manner when a pressure difference occurs inside and outside, and has different venting methods for different working conditions; when thermal runaway occurs in the cavity, when the temperature reaches 120-200℃, the spring, valve body and piston no longer bind each other to form a straight pressure relief window, realizing a more efficient pressure relief scheme, and adding a new pressure relief method on the basis of the traditional scheme. The two complement each other, ensuring the effectiveness, safety, adaptability and life of the battery pack pressure relief function in the event that one method fails. It is especially valuable in critical equipment or harsh working conditions. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of an explosion-proof valve with a novel pressure relief structure according to an embodiment of this utility model.

[0016] Figure 2 This is a top view of the explosion-proof valve with a novel pressure relief structure according to an embodiment of this utility model.

[0017] Figure 3 yes Figure 2 Sectional view at point CC.

[0018] Figure 4 This is an exploded view of the explosion-proof valve with a novel pressure relief structure according to an embodiment of this utility model.

[0019] Figure 5 This is a three-dimensional structural diagram of the inner seal of an embodiment of this utility model.

[0020] Explanation of icon numbers 1. Valve body, 2. Guide rod, 3. Reset mechanism, 4. Inner seal, 5. Piston, 6. Waterproof and breathable membrane, 7. Pressure relief hole, 8. Air passage, 9. Outer seal, 10. Pressure ring, 11. Bearing, 12. Iron sheet, 13. Piston cover, 14. Exhaust groove, 15. Vent groove, 16. Overflow groove, 17. Protective sleeve. Detailed Implementation

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] In this embodiment of the invention, directional indicators (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0024] Please refer to Figures 1-5 The explosion-proof valve with a novel pressure relief structure according to this utility model embodiment includes a valve body, a guide rod, a reset mechanism, an inner seal, a piston, and a waterproof and breathable membrane.

[0025] The valve body has a pressure relief hole, which forms a straight-through pressure relief window during pressure relief. One end of the guide rod passes through the valve body and is screwed to the piston, while the other end of the guide rod and the piston are located on opposite sides of the valve body. Corresponding air passages are provided inside the guide rod and piston, and a waterproof and breathable membrane is correspondingly located on the piston at the end of the air passage. That is, the air passages extend through both ends, with the waterproof and breathable membrane located at the outer end of the air passage. An inner seal is correspondingly located on one side of the valve body, between the valve body and the piston; an outer seal is correspondingly located on the opposite side of the valve body. Both the inner and outer seals are annular.

[0026] One end of the reset mechanism acts on the guide rod, and the other end acts on the valve body, applying force to the guide rod to make the piston tightly adhere to the inner seal to form a seal. Under normal circumstances, gas passes through the air passage in the guide rod and piston, and then exits through the waterproof and breathable membrane; during pressure relief, high-pressure gas pushes the piston open through the pressure relief hole, separating the piston from the inner seal, and pressure is relieved through the gap between the piston and the inner seal.

[0027] In one embodiment, the valve body is provided with a groove corresponding to the inner seal, and the inner seal is disposed in the groove. The groove is wider at the bottom and narrower at the top, and the inner seal is also wider at the bottom and narrower at the top. Preferably, the inner seal has a trapezoidal cross-section. The trapezoidal structure of this invention, which is wider at the bottom and narrower at the top, can prevent the inner seal from falling off during pressure relief.

[0028] In one implementation, the bottom of the inner seal is provided with several venting grooves. Preferably, the venting grooves are inverted V-shaped. The venting grooves prevent air trapping during installation of the inner seal, ensuring even installation and resulting in more stable overall performance and better sealing.

[0029] In one implementation, a bearing hole is provided on the valve body, and a bearing is installed in the bearing hole. The guide rod passes through the bearing on the valve body and is screwed to the piston. The bearing is a plastic bearing that softens at 120℃-200℃. The softening of the plastic bearing at high temperatures allows the explosion-proof valve to release pressure more quickly.

[0030] In one implementation, the explosion-proof valve with the novel pressure relief structure also includes a pressure ring, and a waterproof and breathable membrane is mounted on the piston via the pressure ring. An overflow groove is correspondingly provided on the piston, with the waterproof and breathable membrane located at the bottom of the overflow groove. A piston cap is provided on the piston, and a vent groove is opened on the piston to connect the overflow groove and the outside. Gas permeating through the waterproof and breathable membrane is discharged to the outside through the vent groove. A metal plate is correspondingly provided between the piston and the piston cap, with the metal plate providing clearance at the vent groove.

[0031] In one implementation, the reset mechanism is a spring, which is fitted onto the guide rod, and a protective sleeve is provided on the outside of the guide rod. This invention adjusts the pressure threshold for pressure relief by adjusting the spring force.

[0032] This invention represents one of the final and crucial lines of defense in battery safety design. Through ingenious mechanical structure design, it employs different venting methods for various operating conditions, releasing the destructive energy (high-pressure gases and high-temperature substances) accumulated inside the battery in a controllable manner. This minimizes the risk of catastrophic explosions and protects personal and property safety. The pressure of this invention can be precisely set, and its reliable opening performance and sufficient pressure relief capacity are key to its effectiveness.

[0033] 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 novel explosion-proof valve with a pressure relief structure, characterized in that, The device includes a valve body, a guide rod, a reset mechanism, an inner seal, a piston, and a waterproof and breathable membrane. The valve body has a pressure relief hole. The guide rod passes through the valve body and is screwed to the piston. Corresponding air passages are provided inside the guide rod and the piston. The waterproof and breathable membrane is correspondingly located on the piston. The inner seal is correspondingly located on the valve body and is situated between the valve body and the piston. One end of the reset mechanism acts on the guide rod, and the other end acts on the valve body, applying a force to the guide rod to make the piston tightly adhere to the inner seal.

2. The explosion-proof valve with the novel pressure relief structure as described in claim 1, characterized in that, The valve body is provided with a groove corresponding to the inner seal, and the inner seal is correspondingly located in the groove.

3. The explosion-proof valve with the novel pressure relief structure as described in claim 2, characterized in that, The slot is wider at the bottom and narrower at the top, and the inner seal is wider at the bottom and narrower at the top.

4. The explosion-proof valve with the novel pressure relief structure as described in claim 1, characterized in that, The bottom of the inner seal is provided with several venting grooves.

5. The explosion-proof valve with the novel pressure relief structure as described in claim 4, characterized in that, The exhaust channel is inverted V-shaped.

6. The explosion-proof valve with the novel pressure relief structure as described in claim 1, characterized in that, The valve body is equipped with a bearing, and the guide rod passes through the bearing on the valve body and is screwed to the piston. The bearing is a plastic bearing.

7. The explosion-proof valve with the novel pressure relief structure as described in claim 1, characterized in that, It also includes a pressure ring, through which a waterproof and breathable membrane is mounted on the piston.

8. The explosion-proof valve with the novel pressure relief structure as described in claim 1, characterized in that, The piston is provided with an overflow groove, a waterproof and breathable membrane is placed at the bottom of the overflow groove, the piston is provided with a piston cover, and a venting groove is provided on the piston to connect the overflow groove and the outside.

9. The explosion-proof valve with the novel pressure relief structure as described in claim 1, characterized in that, An external seal is provided on the valve body.

10. The explosion-proof valve with the novel pressure relief structure as described in claim 1, characterized in that, The reset mechanism is a spring, which is fitted onto the guide rod, and a protective sleeve is provided on the outside of the guide rod.

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