Waterproof breathable explosion-proof valve integrating low pressure and high pressure

Abstract

A low-pressure and high-pressure integrated waterproof breathable explosion-proof valve comprises a valve body, a valve element, an elastic piece and a guide shaft. The valve body is provided with an anti-explosion cavity, a pressure relief hole and a guide hole, the valve element is located in the anti-explosion cavity, a sealing ring is arranged between the valve element and the inner wall of the anti-explosion cavity, and the elastic piece is used for driving the valve element to be tightly pressed on the sealing ring so as to seal the anti-explosion cavity; a breathable film is arranged in the valve element, and a through hole and an air outlet groove are formed in the valve element. The guide shaft is arranged on the valve element and penetrates through the guide hole, and the guide shaft is matched with the guide hole to be used for preventing the valve element from deflecting. According to the running state of the battery pack, ventilation can be achieved through the breathable film, pressure can be relieved quickly after the valve element is jacked up, and the safety performance of the battery pack is improved; the valve element and the valve body are limited through the guide shaft, the problem that the valve element deviates and cannot be restored after pressure relief can be solved, and then the structural stability of the waterproof ventilation valve is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery explosion protection, and in particular to a waterproof and breathable explosion-proof valve that integrates low pressure and high pressure. Background Technology

[0002] Waterproof and breathable valves are key components in new energy vehicle battery packs used for pressure relief and explosion prevention. Especially during fast charging, the air pressure inside the battery pack rises rapidly, requiring pressure relief through waterproof and breathable valves.

[0003] The utility model patent with patent number CN220934320U discloses an explosion-proof valve with a tension spring structure. When the battery pack is operating normally, it can be ventilated through a waterproof and breathable membrane inside the valve. When the battery pack is abnormal, the valve core opens to quickly release pressure, and the elastic force provided by the tension spring causes the valve core to reset after pressure release.

[0004] In this patent, the valve core and the main body are elastically connected by a tension spring. However, the tension spring can only provide elastic force to hold the valve core in place, and it lacks the function of limiting the valve core. When the battery thermal runaway occurs, the gas flow rate is fast and the force is large. When the valve core is pushed open by the gas generated by the battery thermal runaway, the force is uneven. That is, the valve core is often offset while being pushed open, causing the center of the valve core to deviate from the main body. Therefore, when the tension spring pulls the valve core back after depressurization, there is a chance that it will get stuck due to the offset of the valve core. The valve core cannot return to its original shape smoothly, which leads to the failure of the waterproof and breathable membrane. External water vapor can directly pass through the valve body and enter the battery pack, causing other malfunctions.

[0005] Therefore, to ensure the safety performance of the battery pack, it is necessary to further optimize the structure of the waterproof and breathable valve. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a waterproof, breathable and explosion-proof valve that integrates low pressure and high pressure. It provides guidance to prevent the valve core from shifting and prevents the valve core from failing to return to its original position after pressure relief, thus preventing the waterproof and breathable valve from malfunctioning.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A waterproof, breathable, and explosion-proof valve that integrates low-pressure and high-pressure operation includes: a valve body, a valve core, an elastic element, and a guide shaft;

[0009] The valve body is provided with an explosion-proof cavity, a pressure relief hole and a guide hole. The valve core is located in the explosion-proof cavity. A sealing ring is provided between the valve core and the inner wall of the explosion-proof cavity. The elastic element is used to drive the valve core to press against the sealing ring to close the explosion-proof cavity.

[0010] The valve core is provided with a breathable membrane, and the valve core is provided with a through hole and an air outlet groove;

[0011] The guide shaft is disposed on the valve core and passes through the guide hole. The guide shaft and the guide hole cooperate to prevent the valve core from deflecting.

[0012] In one embodiment, the number of guide shafts is two.

[0013] In one embodiment, the number of guide shafts is four.

[0014] In one embodiment, the guide shaft includes an optical axis portion, a flange, and a threaded portion. The threaded portion is threadedly connected to the valve core, the flange abuts against the outer wall of the valve core, and the optical axis portion passes through the guide hole.

[0015] In one embodiment, the outer diameter of the flange is larger than the diameter of the guide hole, and the outer wall of the flange is provided with a wrench position.

[0016] In one embodiment, the valve core is disc-shaped, the breathable membrane is located between the through hole and the air outlet groove, and a rubber pad is provided inside the valve core.

[0017] In one embodiment, a top cover is provided on the side of the valve core away from the valve body.

[0018] In one embodiment, the valve body is provided with a movable cap, and the elastic element is disposed between the movable cap and the valve core.

[0019] In one embodiment, the elastic element is a tension spring, the elastic element is provided with an elastic hook, and the valve core and the movable cap are both provided with an arched support portion that matches the elastic hook.

[0020] The above-mentioned waterproof, breathable, and explosion-proof valve that combines low and high pressure has the following beneficial effects:

[0021] 1. Depending on the battery pack's operating status, it can be ventilated through a breathable membrane, and can also quickly release pressure after the valve core is lifted, thereby improving the battery pack's safety performance.

[0022] 2. The valve core and valve body are limited by a guide shaft, which can avoid the problem of the valve core shifting and being unable to return to its original position after pressure relief, thereby improving the structural stability of the waterproof and breathable valve. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a waterproof, breathable, and explosion-proof valve that integrates low and high pressure.

[0025] Figure 2 This is a schematic diagram showing the disassembly of a waterproof, breathable, and explosion-proof valve that integrates low and high pressure.

[0026] Figure 3 This is a schematic diagram of the valve body structure;

[0027] Figure 4 This is a schematic diagram of the back of the valve core;

[0028] Figure 5 This is a schematic diagram of the internal structure of a waterproof, breathable, and explosion-proof valve that integrates low and high pressure.

[0029] Figure 6 This is a schematic diagram of a waterproof, breathable, and explosion-proof valve that integrates low and high pressure under normal conditions.

[0030] Figure 7 This is a schematic diagram showing the valve core ejecting from the valve body.

[0031] Figure 8 This is a schematic diagram of the elastic element. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please seeFigure 1 and Figure 2 This utility model provides a waterproof, breathable, and explosion-proof valve 10 that integrates low and high pressure, comprising: a valve body 100, a valve core 200, an elastic element 300, and a guide shaft 400. The waterproof, breathable, and explosion-proof valve 10 disclosed in this application, integrating low and high pressure, is used in battery packs to balance the internal and external pressures of the battery pack.

[0036] Please see Figure 2 and Figure 3 The valve body 100 is provided with an explosion-proof cavity 110, a pressure relief hole 120 and a guide hole 130. The valve core 200 is located inside the explosion-proof cavity 110. A sealing ring 500 is provided between the valve core 200 and the inner wall of the explosion-proof cavity 110. The elastic element 300 is used to drive the valve core 200 to press against the sealing ring 500 to seal the explosion-proof cavity 110. After the valve body 100 is fixed on the battery pack, the pressure relief hole 120 is located inside the battery pack, while the explosion-proof cavity 110 is located outside the battery pack.

[0037] Please see Figure 2 and Figure 4 The valve core 200 is provided with a breathable membrane 210, and the valve core 200 is provided with a through hole 220 and an air outlet groove 230.

[0038] Please see Figure 2 and Figure 5 The guide shaft 400 is mounted on the valve core 200, and the guide shaft 400 passes through the guide hole 130. The guide shaft 400 and the guide hole 130 cooperate to prevent the valve core 200 from deflecting.

[0039] Depending on the operating status of the battery pack, the waterproof, breathable, and explosion-proof valve 10, which integrates low and high pressure, has the following pressure relief methods:

[0040] When all cells in the battery pack are charging and discharging normally, the amount of gas generated is small. At this time, the gas pressure inside the battery pack will not change drastically, and the explosion-proof valve is in a low-pressure environment. At this time, the gas generated during charging and discharging enters the explosion-proof chamber 110 through the pressure relief hole 120. Because the gas pressure inside the battery pack is low at this time, it is insufficient to overcome the elastic element 300 to open the valve core 200. Therefore, the gas will enter the through hole 220, pass through the vent membrane 210, and be discharged through the vent groove 230. At this time, the internal components of the waterproof vent valve are in the following state of cooperation: Figure 6 As shown, ventilation through the breathable membrane 210 can prevent external moisture and dust from entering the battery pack;

[0041] When charging and discharging are abnormal, causing the air pressure inside the battery pack to rise rapidly, the air exchange rate of the breathable membrane 210 is much lower than the gas generation rate. At this time, the explosion-proof valve is in a high-pressure environment. When the air pressure inside the battery pack rises to exceed the elastic force provided by the elastic element 300, the valve core 200 will be opened. Since the valve core 200 no longer holds the sealing ring 500, the gas can be directly discharged outward through the explosion-proof cavity 110. After the air pressure drops, the elastic force applied by the elastic element 300 can send the valve core 200 back to its original position, so that it re-closes the explosion-proof cavity 110.

[0042] During the process of the valve core 200 being opened by gas and returning under the action of elastic force, the force applied to the valve core 200 is not evenly distributed on it. This application limits the valve core 200 by cooperating with the guide shaft 400 and the guide hole 130, which can ensure that the valve core 200 will not shift after separating from the sealing ring 500. Specifically, the center line of the valve core 200 and the center line of the valve body 100 always remain coincident, so that the valve core 200 will not shift or flip in the horizontal direction, and the elastic element 300 can smoothly reset it, so that the waterproof and breathable valve can return to its original state by itself after depressurization.

[0043] Please see Figure 6 , Figure 7 and Figure 8 Furthermore, when a battery experiences thermal runaway, the internal pressure and temperature of the battery pack rise rapidly in a short period of time, exceeding those of an abnormal charging / discharging state. Therefore, pressure relief capability is crucial to prevent the battery pack from exploding. In this application, a movable cap 140 is provided inside the valve body 100, and an elastic element 300 is located between the movable cap 140 and the valve core 200. The elastic element 300 is a tension spring, and an elastic hook 310 is provided on the elastic element 300. Both the valve core 200 and the movable cap 140 are provided with arched support portions 11 that match the elastic hook 310. The elastic element 300 is fixed between the valve core 200 and the movable cap 140 by hooking the arched support part 11 with the elastic hook 310. The elastic hook 310 itself is elastic. The pressure generated when the battery thermally runs away can instantly open the valve core 200. Under the action of gas force, the elastic hook 310 bends outward and releases the arched support part 11, separating the valve core 200 from the valve body 100, allowing the gas in the battery pack to be discharged quickly. After the gas pressure drops, the explosion-proof chamber 110 remains open to prevent the thermally runaway battery pack from closing again, reducing the probability of battery pack explosion, thereby slowing down the battery pack combustion rate and improving the safety performance of the battery pack.

[0044] Preferably, to ensure the limiting effect on the valve core 200, multiple guide shafts 400 are provided, and the number of guide holes 130 is the same as that of guide shafts 400, for example, the number of guide shafts 400 is 2 or 4.

[0045] Please see Figure 5In one embodiment, the guide shaft 400 includes a shaft portion 410, a flange 420, and a threaded portion 430. The threaded portion 430 is threadedly connected to the valve core 200. The flange 420 abuts against the outer wall of the valve core 200. The shaft portion 410 passes through a guide hole 130. The outer diameter of the flange 420 is larger than the diameter of the guide hole 130, and the outer wall of the flange 420 is provided with a wrench position. When the guide shaft 400 is tightened, the flange 420 abuts against the outer wall of the valve core 200. The wrench position on the flange 420 provides a force application point for easy tightening or loosening of the guide shaft 400 using tools. By providing the flange 420, even if the guide shaft 400 falls off, it will not fall directly through the guide hole 130.

[0046] In one embodiment, the valve core 200 is disc-shaped, the breathable membrane 210 is located between the through hole 220 and the air outlet groove 230, and the valve core 200 is provided with a rubber gasket 240. During the ventilation process, gas enters the valve core 200 through the through hole 220, passes through the breathable membrane 210, and is discharged from the air outlet groove 230.

[0047] In one embodiment, a top cover 250 is provided on the side of the valve core 200 away from the valve body 100.

[0048] The aforementioned waterproof, breathable, and explosion-proof valve 10, which combines low-pressure and high-pressure operation, has the following beneficial effects:

[0049] 1. Depending on the operating status of the battery pack, it can be ventilated through the breathable membrane 210, and can also be quickly depressurized after the valve core 200 is lifted, thereby improving the safety performance of the battery pack.

[0050] 2. The valve core 200 and the valve body 100 are limited by the guide shaft 400, which can avoid the problem that the valve core 200 will shift and cannot be restored after pressure is released, thereby improving the structural stability of the waterproof and breathable valve.

[0051] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A waterproof, breathable, and explosion-proof valve integrating low-pressure and high-pressure operation, characterized in that, include: Valve body, valve core, elastic element, and guide shaft; The valve body is provided with an explosion-proof cavity, a pressure relief hole and a guide hole. The valve core is located in the explosion-proof cavity. A sealing ring is provided between the valve core and the inner wall of the explosion-proof cavity. The elastic element is used to drive the valve core to press against the sealing ring to close the explosion-proof cavity. The valve core is provided with a breathable membrane, and the valve core is provided with a through hole and an air outlet groove; The guide shaft is disposed on the valve core and passes through the guide hole. The guide shaft and the guide hole cooperate to prevent the valve core from deflecting.

2. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 1, characterized in that, The number of guide shafts is 2.

3. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 1, characterized in that, The number of guide shafts is 4.

4. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 1, characterized in that, The guide shaft includes an optical axis, a flange, and a threaded portion. The threaded portion is threadedly connected to the valve core, the flange abuts against the outer wall of the valve core, and the optical axis passes through the guide hole.

5. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 4, characterized in that, The outer diameter of the flange is larger than the diameter of the guide hole, and the outer wall of the flange is provided with a wrench position.

6. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 1, characterized in that, The valve core is disc-shaped, the breathable membrane is located between the through hole and the air outlet groove, and a rubber gasket is provided inside the valve core.

7. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 1, characterized in that, A top cover is provided on the side of the valve core away from the valve body.

8. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 1, characterized in that, The valve body is provided with a movable cap, and the elastic element is located between the movable cap and the valve core.

9. The waterproof, breathable, and explosion-proof valve integrating low pressure and high pressure as described in claim 8, characterized in that, The elastic element is a tension spring, and the elastic element is provided with an elastic hook. The valve core and the movable cap are both provided with an arched support portion that matches the elastic hook.

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