Battery pack explosion relief valve

Abstract

The utility model relates to a battery pack explosion -proof valve, including the valve body with battery pack main part screw connection, the inside hollow of valve body and both ends are all open -ended, the top of valve body is wrapped with waterproof air -permeable membrane, and the outside of valve body and located waterproof air -permeable membrane's inside is equipped with at least one annular groove, waterproof air -permeable membrane is fixed in the inside of annular groove through the elastic ring, the inside sliding connection of valve body has a exhaust cylinder, and the top of exhaust cylinder projects upwards and forms a protruding part. The battery pack explosion -proof valve, the protruding part first lifts waterproof air -permemeble and forms the passageway, then leaks out and releases pressure through the exhaust hole, and two -step action orderly links, avoids the membrane body damage caused by the gas sudden impact in traditional structure, improves the stability of pressure -relief process, and the elastic property of elastic ring makes the waterproof air -permeable membrane's dismounting and replacement operation simple and convenient, can be completed without complex tool, reduces the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of battery explosion-proof technology, specifically to a battery pack explosion-proof valve. Background Technology

[0002] In the safety protection system of battery packs, the explosion-proof valve is a crucial component. With the booming development of the new energy industry, battery packs are widely used in many fields such as new energy vehicles, energy storage power stations, and portable electronic devices. Their safety has attracted much attention. When abnormal conditions such as short circuits, overcharging, or over-discharging occur inside the battery pack, a large amount of high-temperature and high-pressure gas will be generated rapidly. If the pressure cannot be released in time and effectively, it is very likely to cause the battery pack to explode, resulting in serious safety accidents and property damage.

[0003] Currently, most common battery pack explosion-proof valves use air pressure to push a pin to puncture the waterproof and breathable membrane to release pressure. Under normal operating conditions, the waterproof and breathable membrane can ensure the air pressure balance inside and outside the battery pack, while effectively preventing external dust, moisture and other impurities from entering the battery pack, ensuring the normal operating environment of the battery pack. However, once the internal pressure of the battery pack rises sharply and reaches the set threshold of the explosion-proof valve, the internal air pressure will push the pin to puncture the waterproof and breathable membrane, thereby opening the pressure relief channel, allowing the high-pressure gas inside the battery pack to be discharged, reducing the internal pressure and preventing an explosion.

[0004] However, this traditional explosion-proof valve structure has significant drawbacks. On the one hand, once the waterproof and breathable membrane is punctured, its integrity is compromised, and it cannot regain its sealing and breathability functions. This means that the waterproof and breathable membrane cannot be reused. On the other hand, the existing explosion-proof valve structure is inconvenient to replace after the waterproof and breathable membrane is punctured. Since the explosion-proof valve is usually installed in a relatively compact space within the battery pack and is closely connected to other components of the battery pack, disassembling and replacing the waterproof and breathable membrane requires a complex operating procedure, and may even require disassembling the entire battery pack. This not only consumes a lot of time and manpower but may also damage other components of the battery pack during the operation, further increasing the difficulty and risk of maintenance. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a battery pack explosion-proof valve, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a battery pack explosion-proof valve, including a valve body threadedly connected to the main body of the battery pack, wherein the valve body is hollow inside and both the upper and lower ends are open; The top of the valve body is covered with a waterproof and breathable membrane. At least one annular groove is provided on the outside of the valve body and on the inside of the waterproof and breathable membrane. The waterproof and breathable membrane is fixed inside the annular groove by an elastic ring. An exhaust pipe is slidably connected inside the valve body. The top of the exhaust pipe protrudes upward to form a protrusion. Several exhaust holes for exhausting are opened on the outside of the exhaust pipe.

[0007] Furthermore, the elastic ring is made of elastic rubber.

[0008] Furthermore, the exhaust pipe has an internal cavity with a missing bottom, and the exhaust port communicates with the cavity.

[0009] Furthermore, the outer diameter of the exhaust pipe is adapted to the inner diameter of the valve body.

[0010] Furthermore, at least two limiting ribs are vertically arranged on the outer side of the exhaust pipe, and corresponding to the two limiting ribs, a sliding groove is provided on the inner peripheral wall of the valve body for the limiting ribs to slide up and down.

[0011] Furthermore, both the upper and lower ends of the groove are closed, and the top of the limiting rib is located below the vent hole.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. The explosion-proof valve of this battery pack first lifts the waterproof and breathable membrane to form a channel, and then releases the pressure through the vent hole. The two steps are connected in an orderly manner, avoiding the membrane damage caused by sudden gas impact in traditional structures, and improving the stability of the pressure relief process. The elasticity of the elastic ring makes the disassembly and replacement of the waterproof and breathable membrane simple and convenient, which can be completed without complicated tools, reducing maintenance costs.

[0013] 2. The explosion-proof valve of this battery pack has its vent initially hidden inside the valve body. Combined with the double protection of the waterproof and breathable membrane, it can more effectively prevent dust and moisture from entering the battery pack. Especially in humid or dusty environments, the protection effect on the internal components of the battery pack is more significant. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a front view structural diagram of the exhaust pipe of this utility model.

[0015] In the diagram: 1. Valve body; 2. Waterproof and breathable membrane; 3. Elastic ring; 4. Exhaust pipe; 401. Protrusion; 402. Exhaust hole; 403. Limiting rib. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3 The battery pack explosion-proof valve in this embodiment includes a valve body 1, a waterproof and breathable membrane 2, an elastic ring 3, and an exhaust pipe 4.

[0018] Specifically, the valve body 1 is threaded to the battery pack body and adopts a detachable connection method, which facilitates subsequent maintenance and replacement of the explosion-proof valve. The valve body 1 is hollow inside and has open ends at both the top and bottom to form a gas flow channel. Its inner diameter is matched with the outer diameter of the exhaust pipe 4 to ensure that the exhaust pipe 4 slides stably inside the valve body 1. At least one annular groove is provided on the outer side of the valve body 1 and on the inner side of the waterproof and breathable membrane 2, providing an installation position for fixing the waterproof and breathable membrane 2.

[0019] Furthermore, the top of the valve body 1 is wrapped with a waterproof and breathable membrane 2. The waterproof and breathable membrane 2 has good breathability and waterproofness. Under normal conditions, it can balance the air pressure inside and outside the battery pack, while blocking external dust, moisture and other impurities from entering the battery pack. The waterproof and breathable membrane 2 is fixed inside the annular groove by an elastic ring 3. The elastic ring 3 is made of elastic rubber. It uses the constraint force generated by its elastic deformation to tightly fix the waterproof and breathable membrane 2 in the annular groove to ensure the sealing effect, while facilitating the subsequent disassembly and replacement of the waterproof and breathable membrane 2.

[0020] In actual setup, the waterproof and breathable membrane 2 is fixed in the annular groove of the valve body 1 by the elastic ring 3. The elastic ring 3, made of elastic rubber, has good elasticity and can tightly wrap the edge of the waterproof and breathable membrane 2, ensuring the sealing performance between the waterproof and breathable membrane 2 and the valve body 1, effectively preventing external impurities from entering the battery pack. At the same time, the elasticity of the elastic ring 3 makes the disassembly and replacement of the waterproof and breathable membrane 2 simple and convenient, which can be completed without complicated tools, reducing maintenance costs.

[0021] Furthermore, an exhaust pipe 4 is slidably connected inside the valve body 1. The top of the exhaust pipe 4 protrudes upward to form a protrusion 401. When the internal pressure of the battery pack increases, the protrusion 401 can push up the waterproof and breathable membrane 2 to provide a channel for gas discharge. Several exhaust holes 402 are opened on the outside of the exhaust pipe 4, and a cavity with a missing bottom is opened inside. The exhaust holes 402 are connected to the cavity, so that the high-pressure gas inside the battery pack can enter the exhaust holes 402 through the cavity and then be discharged to the outside of the valve body 1.

[0022] In actual setup, when the internal air pressure of the battery pack rises, the pressure pushes the exhaust pipe 4 upward, and the protrusion 401 can accurately lift the waterproof and breathable membrane 2, so that the membrane body separates from the valve body 1 to form a gap, providing an initial channel for the pressure release after the subsequent exhaust hole 402 leaks out, and avoiding local excessive stretching and damage to the membrane body.

[0023] Moreover, the vent 402 is initially hidden inside the valve body 1 and only leaks out when the vent 4 moves to a specific position. This design can prevent external impurities from entering the battery pack through the vent 402 under normal conditions, while ensuring that the vent 402 can quickly connect with the outside when the pressure rises, so as to achieve directional pressure relief.

[0024] In addition, at least two limiting ribs 403 are vertically arranged on the outer side of the exhaust pipe 4. Corresponding to the two limiting ribs 403, a sliding groove is provided on the inner peripheral wall of the valve body 1 for the limiting ribs 403 to slide up and down. Both the upper and lower ends of the sliding groove are closed.

[0025] In actual setup, the top of the limiting rib 403 is located below the exhaust hole 402. The cooperation between the limiting rib 403 and the slide groove can ensure that the exhaust pipe 4 slides stably along the axial direction of the valve body 1, and limit the sliding range of the exhaust pipe 4 to prevent the exhaust pipe 4 from detaching from the inside of the valve body 1.

[0026] The working principle of the above embodiments is as follows: 1. During normal operation, the waterproof and breathable membrane 2 seals the top of the valve body 1 under the constraint of the elastic ring 3. The exhaust pipe 4 is in a low position due to gravity, and the exhaust port 402 is hidden inside the valve body 1. The air pressure balance between the inside and outside of the battery pack is achieved through the waterproof and breathable membrane 2.

[0027] 2. When the internal air pressure of the battery pack rises abnormally, the high-pressure gas first acts on the bottom of the exhaust pipe 4, pushing it to slide upward along the valve body 1. The limiting rib 403 moves synchronously in the sliding groove to ensure smooth movement. The protrusion 401 at the top of the exhaust pipe 4 gradually contacts and lifts the waterproof and breathable membrane 2, causing the membrane to separate from the valve body 1. The exhaust pipe 4 continues to move upward until the outer exhaust hole 402 leaks out from inside the valve body 1. At this time, the high-pressure gas inside the battery pack enters the exhaust hole 402 through the cavity of the exhaust pipe 4, and is then quickly discharged to the outside through the exhaust hole 402.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] 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 battery pack explosion-proof valve, characterized in that: Includes a valve body (1) that is threadedly connected to the main body of the battery pack, wherein the valve body (1) is hollow inside and open at both the top and bottom ends; The top of the valve body (1) is covered with a waterproof and breathable membrane (2). At least one annular groove is provided on the outside of the valve body (1) and on the inside of the waterproof and breathable membrane (2). The waterproof and breathable membrane (2) is fixed inside the annular groove by an elastic ring (3). An exhaust pipe (4) is slidably connected inside the valve body (1). The top of the exhaust pipe (4) protrudes upward to form a protrusion (401). Several exhaust holes (402) for exhausting are opened on the outside of the exhaust pipe (4).

2. The battery pack explosion-proof valve according to claim 1, characterized in that: The elastic ring (3) is made of elastic rubber.

3. The battery pack explosion-proof valve according to claim 1, characterized in that: The exhaust pipe (4) has a cavity with a missing bottom inside, and the exhaust hole (402) is connected to the cavity.

4. The battery pack explosion-proof valve according to claim 1, characterized in that: The outer diameter of the exhaust pipe (4) is adapted to the inner diameter of the valve body (1).

5. The battery pack explosion-proof valve according to claim 1, characterized in that: At least two limiting ribs (403) are vertically arranged on the outer side of the exhaust pipe (4). Corresponding to the two limiting ribs (403), a sliding groove is provided on the inner peripheral wall of the valve body (1) for the limiting ribs (403) to slide up and down.

6. The battery pack explosion-proof valve according to claim 5, characterized in that: Both ends of the groove are closed, and the top of the limiting rib (403) is located below the exhaust hole (402).

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