Combined humidity control spring type breathable anti-explosion valve device

Abstract

The utility model relates to a combined humidity control spring type breathable explosion-proof valve device which comprises a main valve, a first scattered valve and a second scattered valve, wherein the first scattered valve and the second scattered valve are arranged in the main valve; the main valve comprises a protective cover, a waterproof breathable film, a shell, a first O-shaped sealing ring, a main body, a second O-shaped sealing ring, a first compression spring and a valve seat; the first dispersing valve comprises a first dispersing valve seat, a second compression spring, a first dispersing valve retainer and a first valve; the second diffusion valve comprises a second valve, a second diffusion valve holder, a third compression spring and a second diffusion valve seat. Compared with the prior art, under the condition that normal breathing of the battery pack is guaranteed, entering of water vapor around the battery pack can be effectively controlled, and generation of condensate water in the battery pack is controlled; and the main valve, the first dispersing valve and the second dispersing valve can realize serialized product design with different sizes, so that the cost of the anti-explosion valve can be reduced.

Description

Technical Field

[0001] The utility model relates to an explosion-proof valve device, in particular to a combined moisture-control 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 changes in altitude and ambient temperature. If the pressure inside and outside the battery pack is not balanced in time, the battery pack will be compressed, deformed, expanded and burst under the action of the pressure difference. At the same time, in some cases, the battery cell unit inside the battery pack will release a large amount of gas when thermal runaway occurs. If these gases are not discharged to the outside in time, the internal pressure will rise sharply in a short period of time, causing the battery pack to burst or even explode, affecting the personal safety of passengers. Therefore, an explosion-proof vent 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, while reducing the effect of condensation in the battery pack and the explosion-proof function in an emergency. The environment where the car is driving will be muddy, dusty, and stagnant, so it must have the function of waterproof and dustproof. The existing explosion-proof valve cannot effectively prevent the entry of water vapor. The entry of a large amount of water vapor will cause condensation in the battery pack, and the battery pack will fail.

[0003] Patent CN202311488539.1 discloses a magnetic breathable explosion-proof valve device, which includes: an explosion-proof valve body fixed on a battery pack and having a hollow interior; a lower magnet ring fixed inside the explosion-proof valve body; a movable air cover covering the explosion-proof valve body, which includes an upper magnet ring that can form a magnetic force with the lower magnet ring, a push rod connected to the upper magnet ring, and a waterproof breathable membrane that covers the movable air cover channel and allows the gas inside the battery pack to pass through. The magnetic force of the upper magnet ring and the lower magnet causes the movable air cover to press against the explosion-proof valve body to achieve a sealing effect, thereby realizing diversified functions such as ventilation, dustproof, waterproof, and pollution-proof. However, the use of a waterproof breathable membrane and a sealing gasket cannot control the entry of water vapor and the generation of condensed water under normal breathing conditions of the battery pack. Utility Model Content

[0004] The purpose of the utility model is to provide a combined moisture-controlled spring-type breathable explosion-proof valve device in order to overcome the defects of the above-mentioned prior art. The main valve plays the function of an explosion-proof valve, and the first diffuser valve and the second diffuser valve play the breathing function of the battery pack under normal working conditions. Through the opening pressure control of the first diffuser valve and the second diffuser valve, the entry of water vapor around the battery pack can be effectively controlled while ensuring the normal breathing of the battery pack, and the generation of condensed water in the battery pack can be controlled. The main valve, the first diffuser valve and the second diffuser valve can realize serialized product designs of different sizes, which is conducive to reducing the cost of the explosion-proof valve.

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

[0006] The utility model provides a combined moisture-control spring-type air-permeable explosion-proof valve device, comprising: a main valve and a first diffuser valve and a second diffuser valve arranged in the main valve;

[0007] The main valve includes: a protective cover, a waterproof breathable membrane, a shell, a first O-ring, a main body, a second O-ring, a first compression spring, and a valve seat; the protective cover is connected to the main body, the waterproof breathable membrane and the first O-ring are both arranged on the shell, the second O-ring is arranged on the main body, the first compression spring is arranged on the mounting plane of the valve seat, and the valve seat is arranged in the shell and connected to the shell; a threaded structure is arranged on the main body, and the main valve is fixedly connected to the battery pack through the threaded structure;

[0008] The first dispersion valve comprises: a first dispersion valve seat, a second compression spring, a first dispersion valve retainer, and a first valve membrane; the first dispersion valve seat is connected to the interior of the housing, the second compression spring is arranged between the first dispersion valve seat and the first dispersion valve retainer, and the first valve membrane is arranged between the housing and the first dispersion valve retainer;

[0009] The second dispersion valve includes: a second flap, a second dispersion valve holder, a third compression spring, and a second dispersion valve seat; the second dispersion valve seat is connected to the interior of the shell, the third compression spring is arranged between the second dispersion valve seat and the second dispersion valve holder, and the second flap is arranged between the shell and the second dispersion valve holder.

[0010] Furthermore, the waterproof breathable membrane is welded to the first step of the shell by ultrasonic welding process.

[0011] Furthermore, the waterproof and breathable membrane is bonded to the first step of the shell by glue.

[0012] Furthermore, a first O-ring is arranged on the annular groove of the housing.

[0013] Furthermore, a second O-ring is disposed in the concave groove of the main body.

[0014] Furthermore, the valve seat is connected to the clamping plane of the shell through the groove of the first clamping structure.

[0015] Furthermore, a first card slot is provided on the protective cover, and the protective cover is snap-connected with the buckle on the main body through the first card slot.

[0016] Furthermore, the first dispersion valve seat is connected to the second clamping groove in the shell through the second clamping structure; the second dispersion valve seat is connected to the third clamping groove of the shell through the third clamping structure.

[0017] Furthermore, the second compression spring is arranged between the first base of the first dispersion valve seat and the first groove of the first dispersion valve retainer; the third compression spring is arranged between the second base of the second dispersion valve seat and the groove of the second dispersion valve retainer.

[0018] Furthermore, the first valve is arranged between the first end surface of the housing and the first top end of the first diffuser valve holder; the second valve is arranged between the second end surface of the housing and the second top end of the second diffuser valve holder.

[0019] The working principle of this utility model:

[0020] The combined moisture-control spring-type breathable explosion-proof valve device is in normal working conditions: when the gas pressure in the battery pack case is lower than the pressure of the surrounding environment, and the pressure difference reaches the critical state of the third compression spring and the second valve membrane, the opening pressure of the second dispersion valve is reached, the third compression spring is further compressed, and the second valve opens. At this time, the breathable explosion-proof valve device is in a low-pressure suction state. In this low-pressure suction working state, the gas outside the battery pack enters through the air inlet and the air inlet channel on the protective cover, and flows to the waterproof breathable membrane welded at the second step on the shell. After passing through the waterproof breathable membrane, the gas enters the entrance of the shell, and then enters the first channel formed by the shell, the second valve and the second dispersion valve retainer, and enters the battery pack through the first cavity, forming an air pressure balance between the battery pack and the surrounding environment. During the suction process, the entry of water vapor can be effectively controlled by adjusting the opening pressure of the second dispersion valve.

[0021] When the gas pressure in the battery pack is greater than the pressure of the surrounding environment, and the pressure difference reaches the critical state of the second compression spring and the first valve, the opening pressure of the first diffuser is reached, the second compression spring is further compressed, and the first valve is opened. At this time, the breathable explosion-proof valve device is in the exhalation state. In this high-pressure exhalation working state, the high-pressure gas of the battery pack enters the outlet of the shell through the second cavity, and then enters the second channel formed by the shell, the first valve and the first diffuser retainer, passes through the waterproof breathable membrane, and passes through the air outlet and the air outlet channel on the protective cover, and enters the atmosphere, thereby achieving air pressure balance between the battery pack and the surrounding environment. The first O-ring installed at the annular groove on the shell and the second O-ring installed at the concave groove on the main body are used for sealing to prevent water, dirt, dust and pollutants outside the battery pack from entering the battery pack.

[0022] When the battery chip of the battery pack experiences thermal runaway and generates a large amount of gas, when the pressure inside the battery pack is greater than the opening pressure set by the main valve, it is in an explosion-proof state. At this time, under the pressure of the large amount of gas inside the battery pack, the first compression spring installed on the valve seat moves upward, pushing open the shell, allowing a large amount of gas to be discharged out of the battery pack through the third channel between the shell and the main body. In this state, a large amount of gas in the battery pack will be quickly discharged in a short time to protect the battery pack and personnel safety.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] (1) The explosion-proof valve and the normal breathing light function of the battery pack can be realized at the same time. The main valve plays the role of the explosion-proof valve, and the first and second diffuser valves play the breathing function of the battery pack under normal working conditions.

[0025] (2) By controlling the opening pressure of the first diffuser valve and the second diffuser valve, the entry of water vapor around the battery pack and the generation of condensed water in the battery pack can be effectively controlled while ensuring the normal breathing of the battery pack.

[0026] (3) The main valve, the first diffuser valve and the second diffuser valve can realize serialized product designs of different sizes, which is beneficial to reducing the cost of the explosion-proof valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an exploded view of the combined moisture-control spring-type breathable explosion-proof valve device.

[0028] Figure 2 It is a schematic diagram of the main valve of the combined moisture-control spring-type breathable explosion-proof valve device.

[0029] Figure 3 It is a schematic diagram of a combined moisture-control spring-type breathable explosion-proof valve device.

[0030] Figure 4 It is a schematic diagram of the air intake working state of the combined moisture control spring-type breathable explosion-proof valve device.

[0031] Figure 5 It is a schematic diagram of the exhalation working state of the combined moisture-control spring-type breathable explosion-proof valve device.

[0032] Figure 6 It is a schematic diagram of the explosion-proof working state of the combined moisture-controlled spring-type breathable explosion-proof valve device.

[0033] Figure numerals: 1-protective cover; 2-waterproof breathable membrane; 3-housing; 4-first O-type sealing ring; 5-main body; 6-second O-type sealing ring; 7-first compression spring; 8-valve seat; 9-first diffuser valve seat; 10-second compression spring; 11-first diffuser valve retainer; 12-first flap; 13-second flap; 14-second diffuser valve retainer; 15-third compression spring; 16-second diffuser valve seat; 17-first step; 18-annular groove; 19-concave groove; 20-installation plane; 21-first clamping structure; 22-clamping plane; 23-first clamping groove; 24-clip; 25-groove; 26-threaded structure; 27-second clamping structure; 28-second clamping groove; 29-first base; 30-first groove; 31-first end face; 32-first top; 33-third clamping groove; 34-third clamping structure; 35-second base; 36-second groove; 37-second end face; 38-second top; 39-main valve; 40-first diffuser valve; 41-second diffuser valve; 43-inlet channel; 44-second step; 45-inlet; 46-first channel; 47-first cavity; 48-second cavity; 49-outlet; 50-second channel; 51-exit channel; 52-third channel. DETAILED DESCRIPTION

[0034] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0035] Example 1

[0036] This embodiment provides a combined moisture control spring type air permeable explosion-proof valve device, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes: a main valve 39 and a first diffuser valve 40 and a second diffuser valve 41 arranged in the main valve 39;

[0037] The main valve 39 includes: a protective cover 1, a waterproof breathable membrane 2, a shell 3, a first O-ring 4, a main body 5, a second O-ring 6, a first compression spring 7, and a valve seat 8; the protective cover 1 is connected to the main body 5, the waterproof breathable membrane 2 and the first O-ring 4 are both arranged on the shell 3, the second O-ring 6 is arranged on the main body 5, the first compression spring 7 is arranged on the mounting plane 20 of the valve seat 8, and the valve seat 8 is arranged in the shell 3 and connected to the shell 3; a threaded structure 26 is provided on the main body 5, and the main valve 39 is fixedly connected to the battery pack through the threaded structure 26;

[0038] The first dispersion valve 40 includes: a first dispersion valve seat 9, a second compression spring 10, a first dispersion valve holder 11, and a first valve 12; the first dispersion valve seat 9 is connected to the interior of the housing 3, the second compression spring 10 is arranged between the first dispersion valve seat 9 and the first dispersion valve holder 11, and the first valve 12 is arranged between the housing 3 and the first dispersion valve holder 11;

[0039] The second dispersion valve 41 includes: a second valve membrane 13, a second dispersion valve holder 14, a third compression spring 15, and a second dispersion valve seat 16; the second dispersion valve seat 16 is connected to the interior of the housing 3, the third compression spring 15 is arranged between the second dispersion valve seat 16 and the second dispersion valve holder 14, and the second valve membrane 13 is arranged between the housing 3 and the second dispersion valve holder 14.

[0040] In a specific embodiment, the waterproof breathable membrane 2 is welded to the first step 17 of the housing 3 by ultrasonic welding.

[0041] In a specific embodiment, the first O-ring 4 is disposed on the annular groove 18 of the housing 3 .

[0042] In a specific embodiment, the second O-ring 6 is disposed in the concave groove 19 of the main body 5 .

[0043] In a specific embodiment, the valve seat 8 is connected to the clamping plane 22 of the housing 3 through the groove 25 of the first clamping structure 21. The first clamping structure 21 is an annular flange provided on the valve seat 8.

[0044] In a specific embodiment, a first card slot 23 is provided on the protective cover 1 , and the protective cover 1 is engaged with a buckle 24 on the main body 5 via the first card slot 23 .

[0045] In a specific embodiment, the first dispersion valve seat 9 is connected to the second clamping groove 28 in the housing 3 through the second clamping structure 27; the second dispersion valve seat 16 is connected to the third clamping groove 33 of the housing 3 through the third clamping structure 34. The second clamping structure 27 is a flange provided on the first dispersion valve seat 9, and the third clamping structure 34 is a flange provided on the second dispersion valve seat 16.

[0046] In a specific embodiment, the second compression spring 10 is arranged between the first base 29 of the first dispersion valve seat 9 and the first groove 30 of the first dispersion valve retainer 11; the third compression spring 15 is arranged between the second base 35 of the second dispersion valve seat 16 and the groove 36 of the second dispersion valve retainer 14.

[0047] In a specific embodiment, the first valve 12 is disposed between the first end surface 31 of the housing 3 and the first top end 32 of the first diffuser valve holder 11 ; the second valve 13 is disposed between the second end surface 37 of the housing 3 and the second top end 38 of the second diffuser valve holder 14 .

[0048] The working principle of this embodiment:

[0049] like Figure 4 As shown, the combined moisture control spring type breathable explosion-proof valve device is in normal working condition: when the gas pressure in the battery pack case is lower than the pressure of the surrounding environment, and the pressure difference reaches the critical state of the third compression spring 15 and the second valve membrane 13, the opening pressure of the second diffuser 41 is reached, the third compression spring 15 is further compressed, and the second valve 13 is opened. At this time, the breathable explosion-proof valve device is in a low-pressure suction state. In this low-pressure suction working state, the gas outside the battery pack enters through the air inlet and the air inlet channel 43 on the protective cover 1, and flows to the waterproof breathable membrane 2 welded at the second step 44 on the shell 3. After passing through the waterproof breathable membrane 2, the gas enters the inlet 45 of the shell 3, and then enters the first channel 46 formed by the shell 3, the second valve 13 and the second diffuser retainer 16, and enters the battery pack through the first cavity 47, forming an air pressure balance between the battery pack and the surrounding environment. During the suction process, by adjusting the opening pressure of the second diffuser 41, the entry of water vapor can be effectively controlled.

[0050] like Figure 5 As shown, when the gas pressure in the battery pack is greater than the pressure of the surrounding environment, and the pressure difference reaches the critical state of the second compression spring 10 and the first valve 12, the opening pressure of the first diffuser 40 is reached, the second compression spring 10 is further compressed, and the first valve 12 is opened. At this time, the air-permeable explosion-proof valve device is in the exhalation state. In this high-pressure exhalation working state, the high-pressure gas of the battery pack enters the outlet 49 of the shell 3 through the second cavity 48, and then enters the second channel 50 formed by the shell 3, the first valve 12 and the first diffuser retainer 11, passes through the waterproof breathable membrane 2, and passes through the air outlet and the air outlet channel 51 on the protective cover 1, and enters the atmosphere, thereby achieving the balance of air pressure in the battery pack and the surrounding environment. The first O-type sealing ring 4 installed at the annular groove 18 on the shell 3 and the second O-type sealing ring 6 installed at the concave groove 19 on the main body 5 are used for sealing to prevent water, soil, dust and pollutants outside the battery pack from entering the battery pack.

[0051] like Figure 6 As shown, when the battery chip of the battery pack has thermal runaway and a large amount of gas is generated, when the pressure inside the battery pack is greater than the opening pressure set by the main valve 39, it is in an explosion-proof state. At this time, under the pressure of a large amount of gas inside the battery pack, the first compression spring 7 installed on the valve seat 8 moves upward, pushing open the shell 3, so that a large amount of gas is discharged out of the battery pack through the third channel 52 between the shell 3 and the main body 5. In this state, a large amount of gas in the battery pack will be quickly discharged in a short time to protect the battery pack and personnel safety.

[0052] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0053] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A combined moisture-control spring-type breathable explosion-proof valve device, characterized in that: include: A main valve (39) and a first diffuser valve (40) and a second diffuser valve (41) disposed in the main valve (39); The main valve (39) comprises: a protective cover (1), a waterproof breathable membrane (2), a shell (3), a first O-ring (4), a main body (5), a second O-ring (6), a first compression spring (7), and a valve seat (8); the protective cover (1) is connected to the main body (5); the waterproof breathable membrane (2) and the first O-ring (4) are both arranged on the shell (3); the second O-ring (6) is arranged on the main body (5); the first compression spring (7) is arranged on the mounting plane (20) of the valve seat (8); the valve seat (8) is arranged in the shell (3) and connected to the shell (3); a threaded structure (26) is provided on the main body (5); and the main valve (39) is fixedly connected to the battery pack via the threaded structure (26); The first dispersion valve (40) comprises: a first dispersion valve seat (9), a second compression spring (10), a first dispersion valve retainer (11), and a first valve membrane (12); the first dispersion valve seat (9) is connected to the interior of the housing (3), the second compression spring (10) is arranged between the first dispersion valve seat (9) and the first dispersion valve retainer (11), and the first valve membrane (12) is arranged between the housing (3) and the first dispersion valve retainer (11); The second dispersion valve (41) comprises: a second valve membrane (13), a second dispersion valve retaining frame (14), a third compression spring (15), and a second dispersion valve seat (16); the second dispersion valve seat (16) is connected to the interior of the housing (3), the third compression spring (15) is arranged between the second dispersion valve seat (16) and the second dispersion valve retaining frame (14), and the second valve membrane (13) is arranged between the housing (3) and the second dispersion valve retaining frame (14).

2. A combined moisture control spring type air permeable explosion-proof valve device according to claim 1, characterized in that: The waterproof and breathable membrane (2) is welded to the first step (17) of the shell (3) by means of an ultrasonic welding process.

3. A combined moisture control spring type air permeable explosion-proof valve device according to claim 1, characterized in that: The waterproof and breathable membrane (2) is bonded to the first step (17) of the shell (3) by glue.

4. A combined moisture-control spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The first O-ring (4) is arranged on the annular groove (18) of the housing (3).

5. The combined moisture-control spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The second O-ring (6) is arranged in the concave groove (19) of the main body (5).

6. A combined moisture-control spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The valve seat (8) is connected to the clamping plane (22) of the housing (3) via a groove (25) of the first clamping structure (21).

7. A combined moisture-control spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The protective cover (1) is provided with a first card slot (23), and the protective cover (1) is card-connected with a buckle (24) on the main body (5) via the first card slot (23).

8. The combined moisture-control spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The first dispersion valve seat (9) is connected to a second clamping groove (28) in the housing (3) via a second clamping structure (27); and the second dispersion valve seat (16) is connected to a third clamping groove (33) of the housing (3) via a third clamping structure (34).

9. The combined moisture-control spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The second compression spring (10) is arranged between a first base (29) of the first dispersion valve seat (9) and a first groove (30) of the first dispersion valve retainer (11); and the third compression spring (15) is arranged between a second base (35) of the second dispersion valve seat (16) and a groove (36) of the second dispersion valve retainer (14).

10. The combined moisture-control spring-type air-permeable explosion-proof valve device according to claim 1, characterized in that: The first valve membrane (12) is arranged between a first end surface (31) of the housing (3) and a first top end (32) of the first diffuser valve retainer (11); and the second valve membrane (13) is arranged between a second end surface (37) of the housing (3) and a second top end (38) of the second diffuser valve retainer (14).

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