Multifunctional spring type breathable anti-explosion valve device

Abstract

The utility model relates to a multifunctional spring type breathable anti-explosion valve device. The multifunctional spring type breathable anti-explosion valve device comprises a breathable valve body (8), a first diaphragm (2), a second diaphragm (7), a first spring assembly and a second spring assembly. A first ventilation hole (8.1) and a second ventilation hole (8.2) are formed in the ventilation valve body (8); the first diaphragm (2) is connected with the breather valve body (8); and the second diaphragm (7) is connected with the ventilation valve body (8) and is arranged between the first diaphragm (2) and the first ventilation hole (8.1). Compared with the prior art, the spring type ventilating explosion-proof valve device has the advantages that the second diaphragm is additionally arranged to reduce external wet air flowing into the battery pack while the requirement on large ventilation volume of thermal runaway is met, and condensation of the battery pack is improved to the greatest extent to prevent short circuit in the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof valves, in particular to a multifunctional spring-type air-permeable explosion-proof valve device. Background Art

[0002] At present, electric vehicles have a problem of internal and external pressure difference in the battery pack due to the altitude and the temperature difference between the inside and outside. If the internal and external pressures are not balanced in time, the battery pack will be compressed and deformed and expand and burst under the action of the pressure difference; at the same time, in some cases, a large amount of gas will be released when the internal battery chip unit fails. If these gases are not discharged to the outside in time, the internal pressure will rise sharply in a short time, causing the battery pack to burst or even explode, affecting the personal safety of passengers; therefore, an explosion-proof breathable valve must be installed at the outer end of the battery pack to connect the inside of the battery pack and the outside air for pressure balance, reduce the effect of condensed water in the battery pack, and have an explosion-proof function in an emergency. The environment in which the vehicle is driving will be muddy, dusty, and stagnant, so it is necessary to have the function of waterproof and dustproof. The existing explosion-proof valves all use a three-spring valve arranged axially to reduce the frequency of exchange of internal and external gases in the battery pack (such as CN214889117U, a humidity-controlled explosion-proof balancing valve). This solution is costly and, when the battery is thermally out of control, the particles that are ejected will pollute the environment.

[0003] Therefore, there is an urgent need for a multifunctional spring-type breathable explosion-proof valve device that can solve the above problems. Utility Model Content

[0004] The purpose of the present utility model is to overcome the defects of the above-mentioned prior art and to propose a multifunctional spring-type breathable explosion-proof valve device. By arranging two diaphragms with different air permeabilities and moisture permeabilities, while meeting the large air permeability for thermal runaway, the second diaphragm is added to reduce the flow of external moisture into the battery pack, thereby maximizing the condensation of the battery pack to prevent internal short circuit of the battery pack.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The utility model provides a multifunctional spring-type breathable explosion-proof valve device, which comprises a breathable valve body, a first diaphragm, a second diaphragm, a first spring assembly, and a second spring assembly; the breathable valve body is provided with a first air hole and a second air hole; the first diaphragm is connected to the breathable valve body; the second diaphragm is connected to the breathable valve body, and the second diaphragm is arranged between the first diaphragm and the first air hole; the first spring assembly and the second spring assembly are both arranged in the breathable valve body; the first spring assembly comprises a third air hole, and the third air hole is arranged opposite to the first air hole; the first spring assembly comprises a fourth air hole, and the fourth air hole is arranged opposite to the second air hole.

[0007] Furthermore, the moisture permeability of the first membrane is relatively higher than that of the second membrane, and the moisture permeability is positively correlated with the air permeability, and the moisture permeability is adjusted based on the microporous pore size and path length of the microporous breathable membrane. The first membrane is a high air permeability and high moisture permeability membrane, and the second membrane is a low air permeability and low moisture permeability membrane. The "high" and "low" in the high air permeability and high moisture permeability membrane and the low air permeability and low moisture permeability membrane are relatively high and low. By using two membranes with different moisture permeabilities, the first membrane can meet the large air permeability of thermal runaway, and the second membrane can reduce the flow of external moisture into the battery pack.

[0008] Furthermore, the multifunctional spring-type breathable explosion-proof valve device also includes a protective cover; the protective cover is connected to the breathable valve body, and the protective cover is used to protect the first diaphragm.

[0009] Furthermore, a fifth air hole is provided on the protective cover.

[0010] Furthermore, the first spring assembly includes a first spring fixing plate; and the third air vent is provided on the first spring fixing plate.

[0011] Furthermore, the first spring assembly also includes a first spring, a first sealing press plate, and a first sealing ring; the first spring fixing plate is used to constrain the first spring, the first sealing press plate, and the first sealing ring in the air valve body; the first sealing ring is installed in a first sealing groove opened on the air valve body; the first spring is arranged between the first sealing press plate and the first spring fixing plate.

[0012] Furthermore, the second spring assembly includes a second spring fixing plate; and the fourth air vent is provided on the second spring fixing plate.

[0013] Furthermore, the second spring assembly also includes a second spring, a second sealing press plate, and a second sealing ring; the second spring fixing plate is used to constrain the second spring, the second sealing press plate, and the second sealing ring in the air valve body; the second sealing ring is installed in a second sealing groove opened on the air valve body; the second spring is arranged between the second sealing press plate and the second spring fixing plate.

[0014] Furthermore, the first diaphragm is fixed to the air valve body by ultrasonic welding, glue or in-film injection molding; the second diaphragm is fixed to the air valve body by ultrasonic welding, glue or in-film injection molding.

[0015] Furthermore, the multifunctional spring-type breathable explosion-proof valve device also includes a third sealing ring; the third sealing ring is arranged in a third sealing groove opened on the breathable valve body; the third sealing ring is compressed to prevent gas leakage from the connection interface between the breathable valve and the battery pack shell.

[0016] Furthermore, a fixing point is provided on the air-permeable valve body; the fixing point is used to constrain the air-permeable valve on the shell of the battery pack.

[0017] Furthermore, the first membrane and the second membrane are waterproof and breathable membranes, which may be e-PTFE membranes (expanded polytetrafluoroethylene membranes).

[0018] Furthermore, the first sealing ring, the second sealing ring and the third sealing ring are all O-rings.

[0019] Furthermore, the first spring and the first sealing ring are in a state of being compressed and providing rebound force.

[0020] Furthermore, the second sealing ring and the second spring are in a state of being compressed and providing rebound force.

[0021] Furthermore, the protective cover is fixed to the air-permeable valve body by snapping, welding or gluing and plays a protective role on the first diaphragm.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] 1) The multifunctional spring-type breathable explosion-proof valve device of the utility model is a multifunctional explosion-proof, moisture-controlling and filtering breathable valve. Compared with the existing three-spring axial arrangement scheme, this scheme can arrange two diaphragms. Furthermore, two diaphragms with different air permeabilities and different moisture permeabilities can be arranged. While meeting the large air permeability for thermal runaway, the second diaphragm (a diaphragm with low air permeability and low moisture permeability) is added to reduce the flow of external moisture into the battery pack, thereby maximizing the condensation of the battery pack to prevent internal short circuit of the battery pack.

[0024] 2) The multifunctional spring-type breathable explosion-proof valve device of the utility model has a cost advantage compared to the solution of adding an additional filter element because the diaphragm will no longer rupture when the battery pack is thermally runaway during the entire service life, thereby avoiding the eruption of particles to pollute the environment.

[0025] 3) Compared with the existing three-spring axial arrangement scheme, the multifunctional spring-type breathable explosion-proof valve device of the utility model saves one spring component and has a cost advantage.

[0026] 4) The multifunctional spring-type air-permeable explosion-proof valve device of the utility model actually integrates two spring valves with different air permeability directions into one assembly, which saves the number of connection interfaces with the battery pack and has cost advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the multifunctional spring-type air-permeable explosion-proof valve device of the utility model.

[0028] Figure 2 It is a cross-sectional view of the multifunctional spring-type air-permeable explosion-proof valve device of the utility model in a normal working state.

[0029] Figure 3 It is a structural schematic diagram of the multifunctional spring-type air-permeable explosion-proof valve device of the utility model in the explosion working state.

[0030] In the figure:

[0031] 1. Protective cover, 2. First diaphragm, 3. Second spring fixing plate, 4. Second spring, 5. Second sealing pressing plate, 6. Second sealing ring, 7. Second diaphragm, 8. Air-permeable valve body, 9. First sealing ring, 10. First sealing pressing plate, 11. First spring, 12. First spring fixing plate, 13. Third sealing ring;

[0032] 1.1, fifth air hole, 3.1, fourth air hole, 8.1, first air hole, 8.2, second air hole, 8.3, fixing point, 12.1, third air hole. DETAILED DESCRIPTION

[0033] The utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements in the shape of the openings can be made without departing from the concept of the utility model. These all fall within the scope of protection of the utility model.

[0034] Any features such as preparation methods, materials, structures or composition ratios that are not clearly described in this technical solution shall be deemed as common technical features disclosed in the prior art.

[0035] It should be noted that the directions or positional relationships indicated by "front", "back", "left", "right", "up", "down", "inside", "outside" and the like described in this application are based on the directions or positional relationships indicated in the accompanying drawings, and are intended to be more concise and clear when describing this application. They do not mean that the devices or components must have certain direction restrictions, and therefore cannot be used as limitations on this application. In addition, the embodiments described in this application are only part of the embodiments of the utility model and cannot represent all the embodiments. Other embodiments obtained by those skilled in the art without making creative efforts on this application should all fall within the protection scope of this utility model.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] It should be noted that, in the present utility model, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Example

[0039] refer to Figure 1-3 The present embodiment provides a multifunctional spring-type breathable explosion-proof valve device, including a protective cover 1, a first diaphragm 2, a second spring fixing plate 3, a second spring 4, a second sealing pressing plate 5, a second sealing ring 6, a second diaphragm 7, a breathable valve body 8, a first spring fixing plate 12, a first spring 11, a first sealing pressing plate 10, a first sealing ring 9, and a third sealing ring 13 connected to the shell of the battery pack.

[0040] The first diaphragm 2 is fixed on the air-permeable valve body 8 by ultrasonic welding, glue or film injection molding; the protective cover 1 is fixed on the air-permeable valve body 8 by clamping, welding or glue and protects the first diaphragm 2; the second sealing ring 6 and the first sealing ring 9 are respectively installed in two sealing grooves opened on the air-permeable valve body 8, namely the second sealing groove and the first sealing groove. In the non-working state, the second spring fixing plate 3 constrains the second spring 4, the second sealing pressing plate 5, and the second sealing ring 6 in the air-permeable valve body 8, and the second sealing ring 6 and the second spring 4 are compressed. The first spring fixing plate 12 constrains the first spring 11, the first sealing pressing plate 10, and the first sealing ring 9 in the air breathable valve body 8, and the first spring fixing plate 12 and the first spring 11 are in a compressed state and provide a rebound force; the entire air breathable valve is constrained on the shell of the battery pack through the fixed point 8.3. Specifically, the third sealing ring 13 is arranged in a third sealing groove installed on the air breathable valve body 8. Since the third sealing ring 13 is compressed, it can prevent gas and the like from leaking from the connection interface between the air breathable valve and the shell of the battery pack.

[0041] The first air hole 8.1 and the second air hole 8.2 are formed on the air valve body 8, and the second diaphragm 7 is disposed between the first diaphragm 2 and the first air hole 8.1.

[0042] The second vent hole 8.2 is disposed on a side of the vent valve body 8 close to the battery pack housing, and the first vent hole 8.1 is disposed on a side of the vent valve body 8 far from the battery pack housing.

[0043] The third air hole 12.1 is arranged on the first spring fixing plate 12, and the fourth air hole 3.1 is arranged on the second spring fixing plate 3, wherein the third air hole 12.1 is arranged opposite to the first air hole 8.1; the first spring assembly includes the fourth air hole 3.1, and the fourth air hole 3.1 is arranged opposite to the second air hole 8.2.

[0044] The protective cover 1 is provided with a fifth air hole 1.1, which is connected to the first air hole 8.1, the first diaphragm 2 and the second diaphragm 7 are arranged between the fifth air hole 1.1 and the first air hole 8.1, the fifth air hole 1.1 is connected to the fourth air hole 3.1, and the first diaphragm 2 is arranged between the fifth air hole 1.1 and the fourth air hole 3.1.

[0045] The first spring 11 is disposed between the first sealing pressing plate 10 and the first spring fixing plate 12 .

[0046] The second spring 4 is arranged between the second sealing pressing plate 5 and the second spring fixing plate 3 .

[0047] In this embodiment, the first diaphragm 2 and the second diaphragm 7 are both waterproof and breathable membranes, which can be e-PTFE membranes, and are both purchased parts. For example, the first diaphragm 2 and the second diaphragm 7 can be Shangda SD-003 highly permeable waterproof and breathable membrane; Shangda SD-002 conventional waterproof and breathable membrane, and the air permeability of the former is greater than that of the latter.

[0048] The moisture permeability of the first diaphragm 2 is relatively higher than that of the second diaphragm 7. This application does not improve how to adjust the moisture permeability of the diaphragm. There are products with different moisture permeabilities in the commercially available diaphragms, and those skilled in the art are capable of selecting a suitable diaphragm. The first diaphragm 2 is a highly air-permeable and highly moisture-permeable diaphragm. The first diaphragm 2 is a waterproof breathable membrane with a large air flow rate and a high moisture permeability. The second diaphragm 7 is a low-air-permeable and low-moisture-permeable diaphragm. The "high" and "low" in the highly air-permeable and highly moisture-permeable diaphragm and the low-air-permeable and low-moisture-permeable diaphragm are relatively high and low. By using two diaphragms with different moisture permeabilities, the first diaphragm 2 can meet the large air permeability of thermal runaway, and the second diaphragm 7 can reduce the flow of external moisture into the battery pack.

[0049] The first sealing ring 9, the second sealing ring 6 and the third sealing ring 13 are all O-rings.

[0050] The working principle of the above multifunctional spring-type breathable explosion-proof valve device is as follows:

[0051] The multifunctional spring-type breathable explosion-proof valve device can prevent air from entering the battery pack and also prevent air from flowing out of the battery pack under vehicle environmental conditions because two spring valves with different ventilation directions are arranged relative to each other. Due to the presence of the first diaphragm 2, liquid water from the outside cannot enter the battery pack: when the pressure inside the battery pack case is less than the external pressure and reaches a certain value, the gas with a certain humidity in the atmosphere passes through the fifth air vent 1.1 arranged on the protective cover 1, and then continuously passes through the first diaphragm 2 with high air permeability and high moisture permeability, the second diaphragm 7 with low air permeability and low moisture permeability, and then passes through the first air vent 8.1 arranged on the breathable valve body 8, pushes open the first sealing pressing plate 10, and then enters the battery pack through the third air vent 12.1 arranged on the first spring fixing plate 12. At this time, because the air passes through the second diaphragm with low moisture permeability, the gas with a certain humidity in the atmosphere passes through the fifth air vent 1.1 arranged on the protective cover 1, and then passes through the first air vent 8.1 arranged on the breathable valve body 8, and then enters the battery pack through the third air vent 12.1 arranged on the first spring fixing plate 12. Diaphragm 7, so it can reduce moisture entering the battery pack; when the pressure inside the battery pack is greater than the external pressure and reaches a certain value, the gas in the battery pack passes through the second air vent 8.2 and then pushes open the second sealing press plate 5, and then passes through the fourth air vent 3.1, only passes through the first diaphragm 2 and then flows out from the fifth air vent 1.1, and is finally discharged into the atmosphere; when the internal pressure rises sharply due to thermal runaway of the battery, the gas containing solid particles erupts through the second air vent 8.2 and then pushes open the second sealing press plate 5. Due to the high pressure, the spring is compressed more, and the second sealing press plate 5 is pushed further away, and then passes through the fifth air vent 1.1, only passes through the first diaphragm 2 and then flows out from the fifth air vent 1.1. Due to the filtering effect of the first diaphragm 2, the solids in the gas are blocked in the air valve, thereby avoiding environmental pollution.

[0052] The implementation examples of the present utility model are described to facilitate the understanding and use of the present utility model by ordinary technicians in the technical field. It is obvious that those familiar with the technology in the field can easily make various modifications to these embodiments and apply the general principles described here to other embodiments without creative work. Therefore, the present utility model is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from the scope of the present utility model should be within the scope of protection of the present utility model.

Claims

1. A multifunctional spring-type air-permeable explosion-proof valve device, characterized in that: The multifunctional spring-type breathable explosion-proof valve device comprises a breathable valve body (8), a first diaphragm (2), a second diaphragm (7), a first spring assembly, and a second spring assembly; The air-permeable valve body (8) is provided with a first air-permeable hole (8.1) and a second air-permeable hole (8.2); The first diaphragm (2) is connected to the air-permeable valve body (8); The second diaphragm (7) is connected to the air-permeable valve body (8), and the second diaphragm (7) is arranged between the first diaphragm (2) and the first air-permeable hole (8.1); The first spring assembly and the second spring assembly are both arranged in the air-permeable valve body (8); The first spring assembly comprises a third air vent (12.1), and the third air vent (12.1) is arranged opposite to the first air vent (8.1); The first spring assembly comprises a fourth air vent (3.1), and the fourth air vent (3.1) is arranged opposite to the second air vent (8.2).

2. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The first membrane (2) and the second membrane (7) are waterproof and breathable membranes; The moisture permeability of the first film (2) is higher than the moisture permeability of the second film (7).

3. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The multifunctional spring-type air-permeable explosion-proof valve device also includes a protective cover (1); The protective cover (1) is connected to the air-permeable valve body (8), and the protective cover (1) is used to protect the first diaphragm (2).

4. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The first spring assembly comprises a first spring fixing sheet (12); The third air vent (12.1) is arranged on the first spring fixing sheet (12).

5. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 4, characterized in that: The first spring assembly also includes a first spring (11), a first sealing pressing sheet (10), and a first sealing ring (9); The first spring fixing sheet (12) is used to constrain the first spring (11), the first sealing pressing sheet (10), and the first sealing ring (9) within the air-permeable valve body (8); The first sealing ring (9) is installed in a first sealing groove provided on the air-permeable valve body (8); The first spring (11) is arranged between the first sealing pressing plate (10) and the first spring fixing plate (12).

6. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The second spring assembly comprises a second spring fixing sheet (3); The fourth air vent (3.1) is arranged on the second spring fixing sheet (3).

7. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 6, characterized in that: The second spring assembly also includes a second spring (4), a second sealing pressing sheet (5), and a second sealing ring (6); The second spring fixing sheet (3) is used to constrain the second spring (4), the second sealing pressing sheet (5), and the second sealing ring (6) within the air-permeable valve body (8); The second sealing ring (6) is installed in a second sealing groove provided on the air-permeable valve body (8); The second spring (4) is arranged between the second sealing pressing plate (5) and the second spring fixing plate (3).

8. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The first diaphragm (2) is fixed on the air-permeable valve body (8) by ultrasonic welding, glue or in-film injection molding; The second membrane (7) is fixed to the air-permeable valve body (8) by ultrasonic welding, gluing or in-membrane injection molding.

9. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The multifunctional spring-type air-permeable explosion-proof valve device also includes a third sealing ring (13); The third sealing ring (13) is arranged in a third sealing groove provided on the air-permeable valve body (8); The third sealing ring (13) is used to prevent gas leakage from the connection interface between the air-permeable valve and the shell of the battery pack.

10. A multifunctional spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The breathable valve body (8) is provided with a fixing point (8.3); The fixing point (8.3) is used to constrain the air-permeable valve on the shell of the battery pack.

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