Piston-type explosion-proof valve

Abstract

This utility model discloses a piston-type explosion-proof valve, including a valve body, a guide rod, a piston, and an elastic element. The valve body has a guide hole and a pressure relief hole. The guide rod is mounted on the guide hole and one end is connected to the piston. The elastic element acts on the guide rod, causing the piston to fit tightly against the valve body. The guide rod is hollow, and the piston has a vent hole corresponding to the guide rod and a waterproof and breathable membrane. This utility model can block external moisture and can promptly balance the pressure difference between the inside and outside of the sealed cavity when a pressure difference occurs. It also has different venting methods for different operating conditions. This utility model does not rely on the flatness or roughness of the cavity. The double-layer sealing ring structure serves as a backup for each other. When the first layer of the seal fails, the second layer can still maintain the sealing effect, achieving higher safety, adaptability, and lifespan. It is particularly valuable in critical equipment or harsh operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a piston-type explosion-proof valve. 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 a mixture of gases during charging and discharging. This causes gas to accumulate and expand inside the sealed cavity. If the pressure is not released in time, it can severely affect the battery's lifespan and, in severe cases, lead to an explosion. When energy devices carrying batteries are transported, environmental factors such as altitude differences can create 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 from external moisture entering the battery, which can lead to insulation failure, short circuits, and fires. Utility Model Content

[0003] The technical problem to be solved by this utility model embodiment is to provide a piston-type explosion-proof valve to ensure battery safety.

[0004] To solve the above-mentioned technical problems, this utility model provides a piston-type explosion-proof valve, including a valve body, a guide rod, a piston, and an elastic element. The valve body is provided with a guide hole and a pressure relief hole. The guide rod is mounted on the guide hole and one end is connected to the piston. The elastic element acts on the guide rod to make the piston fit tightly against the valve body. The guide rod is hollow, and the piston is provided with a vent hole corresponding to the guide rod and a waterproof and breathable membrane.

[0005] Furthermore, the valve body is provided with an inner seal corresponding to the piston, which facilitates sealing between the valve body and the piston under the action of the elastic element.

[0006] Furthermore, it also includes a pressure ring, through which a waterproof and breathable membrane is mounted on the piston.

[0007] Furthermore, the piston is provided with an exhaust chamber, a waterproof and breathable membrane is provided at the bottom of the exhaust chamber, the piston is provided with a piston cover, and an exhaust groove is provided on the piston to connect the exhaust chamber and the outside.

[0008] Furthermore, a magnetic material is installed inside the exhaust chamber.

[0009] Furthermore, the valve body is provided with a first outer seal and a second outer seal for sealing installation. The first outer seal and the second outer seal respectively adopt an outer sealing ring and an inner sealing ring arranged on the outside and inside.

[0010] Furthermore, the first outer seal and the second outer seal are integrally formed.

[0011] Furthermore, a protective sleeve is provided on the outside of the guide rod.

[0012] 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 is generated inside and outside, and has different venting methods for different working conditions; This utility model does not rely on the flatness or roughness of the cavity, and the double-layer sealing ring structure serves as a backup for each other. When the first layer of sealing fails, the second layer can still maintain the sealing effect, achieving higher safety, adaptability and lifespan, which is especially valuable in critical equipment or harsh working conditions. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the piston-type explosion-proof valve from one angle according to an embodiment of this utility model.

[0014] Figure 2 This is an exploded view of the piston-type explosion-proof valve according to an embodiment of this utility model.

[0015] Figure 3 This is a cross-sectional view of the piston-type explosion-proof valve according to an embodiment of the present invention.

[0016] Figure 4 This is a three-dimensional structural view of the piston-type explosion-proof valve from another angle, according to an embodiment of this utility model.

[0017] Figure 5 This is a three-dimensional structural diagram of the piston according to an embodiment of the present invention.

[0018] Figure 6 This is a three-dimensional structural diagram of the valve body according to an embodiment of the present utility model.

[0019] Explanation of icon numbers

[0020] Valve body 1, piston 2, guide rod 3, elastic element 4, waterproof and breathable membrane 5, magnetic body 6, sheath 7, guide hole 11, pressure relief hole 12, inner seal 13, first outer seal 14, second outer seal 15, pressure ring 21, exhaust chamber 22, exhaust groove 23, vent hole 24, piston cover 25. 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 1-6 The piston-type explosion-proof valve of this utility model embodiment includes a valve body, a guide rod, a piston, and an elastic element.

[0025] The valve body has a guide hole and a pressure relief hole. A guide rod is mounted on the guide hole and one end is connected to the piston. The piston is located outside the valve body. When the gas inside the valve body is overpressurized, the gas pushes the piston open through the pressure relief hole and releases pressure through the pressure relief hole (that is, when the force generated by the increase in internal pressure is sufficient to overcome the preload of the elastic element, the piston is pushed up and away from the valve body, forming a pressure relief channel. When the pressure decreases, the elastic force of the elastic element will cause the piston to return to its original position and reseal).

[0026] An elastic element acts on the guide rod, causing the piston to press tightly against the valve body (one end of the elastic element acts on the valve body, and the other end acts on the guide rod). The elastic element is preferably a spring, fitted onto the guide rod. The guide rod is hollow, and the piston has vent holes corresponding to the guide rod's position. A waterproof and breathable membrane on the piston is installed at the corresponding vent hole position. During normal pressure relief, the internal gas flows from the guide rod → vent hole → waterproof and breathable membrane → outside.

[0027] In one implementation, the valve body is provided with an internal seal corresponding to the piston. The internal seal facilitates sealing between the valve body and the piston under the action of the elastic element. That is, under the action of the elastic element, the piston and the internal seal of the valve body are tightly sealed, and the internal gas is discharged to the outside through the guide rod to the vent hole to the waterproof and breathable membrane.

[0028] As one implementation, the piston-type explosion-proof valve also includes a pressure ring, through which a waterproof and breathable membrane is installed on the piston to ensure a tight seal and waterproofing.

[0029] In one embodiment, the piston is provided with an exhaust chamber, a waterproof and breathable membrane is disposed at the bottom of the exhaust chamber, the piston is provided with a piston cap, and multiple exhaust grooves are opened on the piston to connect the exhaust chamber and the outside. Gas that permeates through the waterproof and breathable membrane is discharged to the outside through the exhaust grooves.

[0030] As one implementation method, a magnetic element is installed inside the exhaust chamber. When it is necessary to test the airtightness of the battery pack, a tool is placed on the explosion-proof valve, and the magnetic element is attracted to it for inflation.

[0031] In one embodiment, the valve body is provided with a first outer seal and a second outer seal for sealing installation. The first and second outer seals are respectively constructed using an outer sealing ring and an inner sealing ring arranged on the outside and inside, respectively. Preferably, the first and second outer seals are integrally formed. The double-layer sealing ring structure of the first and second outer seals can also be used for overmolding.

[0032] In one implementation, a protective sleeve is provided on the outside of the guide rod. The sleeve has openings to facilitate the discharge of internal gas from the guide rod.

[0033] 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.

[0034] 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 piston-type explosion relief valve characterized by, It includes a valve body, a guide rod, a piston, and an elastic element. The valve body is provided with a guide hole and a pressure relief hole. The guide rod is mounted on the guide hole and one end is connected to the piston. The elastic element acts on the guide rod to make the piston fit tightly against the valve body. The guide rod is hollow, and the piston is provided with a vent hole corresponding to the guide rod and a waterproof and breathable membrane.

2. The piston-type explosion relief valve as set forth in claim 1, wherein The valve body is equipped with an inner seal that corresponds to the piston. The inner seal facilitates sealing between the valve body and the piston under the action of the elastic element.

3. The piston-type explosion relief valve as defined in claim 1, wherein It also includes a pressure ring, through which a waterproof and breathable membrane is installed on the piston.

4. The piston-type explosion relief valve as defined in claim 1, wherein The piston is provided with an exhaust chamber, a waterproof and breathable membrane is placed at the bottom of the exhaust chamber, the piston is provided with a piston cover, and an exhaust groove is provided on the piston to connect the exhaust chamber and the outside.

5. The piston-type explosion relief valve as defined in claim 4, wherein A magnetic material is installed inside the exhaust chamber.

6. The piston-type explosion relief valve as defined in claim 1, wherein The valve body is provided with a first outer seal and a second outer seal for sealing installation. The first outer seal and the second outer seal are respectively provided with an outer sealing ring and an inner sealing ring.

7. The piston-type explosion relief valve as defined in claim 6, wherein The first and second outer seals are integrally formed.

8. The piston-type explosion relief valve as defined in claim 1, wherein A protective sleeve is provided on the outside of the guide rod.

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