Explosion-proof valve

Abstract

The utility model discloses an explosion-proof valve which comprises a valve body, a valve core, a first reset spring and a reset stop piece, the valve body comprises a hollow barrel and a guide sleeve, the two ends of the barrel are open, and the guide sleeve is connected into the barrel through a support. The valve element comprises a valve rod inserted into the guide sleeve in a sliding mode, a valve cover connected to one end of the valve rod and a limiting piece connected to the other end of the valve rod, and the valve rod is sleeved with the first reset spring which is elastically pressed between the support and the limiting piece in an abutting mode. And the reset stop piece is used for driving the valve cover to seal a port in one side of the barrel and driving the valve element to reset before the valve element slides to the first preset opening position, and the reset stop piece is connected with the valve body and used for limiting reset of the valve element after the valve element moves to the first preset opening position. According to the explosion-proof valve disclosed by the utility model, the reset stop piece for limiting the reset of the valve core is arranged in the valve body, so that the explosion-proof valve can be kept in a preset opening state to continuously and smoothly exhaust and relieve pressure, and the stability of explosion and the exhaust capacity before and after explosion are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially a kind of explosion-proof valve. BACKGROUND

[0002] In the wind light storage and automobile power storage battery industry manufacturing, lithium ion battery becomes the key component in new energy vehicle with its high energy density, long cycle times and other advantages.In recent years, new energy vehicle thermal runaway incidents occur frequently.The main reason is that the heat accumulation caused by the exothermic side reaction inside the battery cell, the rate of heat exchange outside the battery cell is less than the rate of heat accumulation, the temperature continues to rise, until reaching ignition point temperature, causing combustion and explosion.

[0003] The current main method to solve this problem is to discharge toxic gases, pressure and heat quickly to prolong the time of explosion and fire.The mainstream classification of explosion-proof valve includes spring piston type explosion-proof valve, center pin type explosion-proof valve and umbrella valve type explosion-proof valve, among which, spring piston type explosion-proof valve has higher market acceptance.For example, patent CN206159577U discloses a kind of explosion-proof waterproof breather valve, which includes hollow valve body, piston rod and spring, piston rod includes hollow rod body and fixed sheet, since the existing fixed sheet surface of explosion-proof valve only has one gas hole and is connected with hollow rod body, and the gas hole is located at the center position of fixed sheet surface.The explosion-proof valve with this structure mainly has two problems, first, the exhaust of explosion-proof valve is too concentrated, with the disadvantage of incoherent exhaust;Second, the explosion-proof valve relies on spring to exhaust, and the exhaust is unstable, when the battery thermal runaway occurs, the one-way piston is lifted, the discharged gas first needs to overcome the spring force, and then can further effectively exhaust, when exhaust for a period of time, the internal pressure of shell becomes smaller, and the gas pressure is less than the spring force, the piston rod returns to original position under the action of spring force, the explosion-proof valve is closed, the high-temperature gas generated by thermal runaway in the shell cannot be continuously discharged, and the heat accumulation in the shell can easily lead to continuous thermal runaway of battery cell in the shell, affecting the safety of battery pack. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of explosion-proof valve to solve the problem that traditional explosion-proof valve cannot continuously and smoothly relieve pressure.

[0005] To achieve the above-mentioned purpose, the technical solution proposed by the utility model is as follows:

[0006] An explosion-proof valve comprises a valve body, a valve core, a first reset spring and a reset stopper, the valve body comprises a hollow barrel with two open ends and a guide sleeve connected to the barrel by a support, the valve core comprises a valve rod slidingly inserted into the guide sleeve, a valve cover connected to one end of the valve rod and a limiting piece connected to the other end of the valve rod, the first reset spring is sleeved on the valve rod and elastically abuts between the support and the limiting piece, the first reset spring is used to drive the valve cover to close one side port of the barrel and can drive the valve core to reset before the valve core slides to a first preset opening position, and the reset stopper is connected to the valve body and is used to limit the reset of the valve core after the valve core moves to the first preset opening position.

[0007] Preferably, the reset stopper comprises a guide sleeve, a limiting plate, a cutter head, a guide rod and a second reset spring, the guide sleeve is connected to the valve body on one side of the valve core, the limiting plate is arranged on the side of the guide sleeve away from the valve core, the cutter head is arranged on the side of the guide sleeve close to the valve core and above the limiting piece, the guide rod is slidingly inserted into the guide sleeve and connected to the limiting plate and the cutter head respectively, and the second reset spring is sleeved on the guide rod and elastically abuts between the guide sleeve and the cutter head.

[0008] Preferably, the guide sleeve comprises a connecting plate connected to the support by a bolt, a first side plate connected to the connecting plate on the side away from the valve core and a second side plate connected to the connecting plate on the side close to the valve core, the first side plate is provided with a first insertion hole for the guide rod to be inserted, and the second side plate is provided with a second insertion hole for the cutter head to be inserted; one end of the guide rod is connected to the cutter head, the other end is connected to the limiting plate in sequence and detachably through the second insertion hole and the first insertion hole, and the second reset spring elastically abuts between the first side plate and the cutter head.

[0009] Preferably, the side surface of the cutter head facing the limiting piece is configured as an inclined surface or an arc surface.

[0010] Preferably, the valve cover is made of plastic, the valve cover is formed with a containing space, and the containing space is provided with a metal sheet that can be attracted by a magnet.

[0011] Preferably, the valve cover comprises a bottom cover and a top cover stacked together, the top surface of the bottom cover is provided with a first recess, the bottom surface of the top cover downwardly protrudes to form a convex ring in interference fit with the first recess, and the top cover, the convex ring and the first recess define the containing space.

[0012] Preferably, the top cover and the bottom cover are formed with an outer air permeation hole communicating with the outside, the convex ring and the bottom cover are formed with an intermediate air permeation hole communicating between the outer air permeation hole and the containing space, and the bottom cover is provided with a plurality of inner air permeation holes in the containing space and communicating with the valve body.

[0013] Preferably, the convex ring bottom surface has a gap with the first sink groove bottom, the bottom cover top surface is provided with a second sink groove penetrating the bottom cover peripheral wall and the first sink groove inner peripheral wall, the second sink groove and the bottom cover bottom surface form the outer vent hole, the convex ring peripheral wall is provided with a plurality of circumferentially spaced inclined grooves, one end of the inclined groove extends to the bottom cover bottom surface, and the other end extends to penetrate the convex ring bottom surface, and the inclined groove and the first sink groove inner peripheral wall form the intermediate vent hole.

[0014] Preferably, a first sealing ring is arranged between the contact surfaces of the valve body and the valve cover and embedded in the valve body or the valve cover, and the end of the valve body away from the valve cover is provided with an external thread and is sleeved with a second sealing ring.

[0015] Preferably, one end of the valve rod is provided with an internal thread hole, and the valve cover is protrudingly formed with a stud matched with the internal thread hole.

[0016] By arranging the reset stopper in the valve body to limit the valve core from resetting after moving to the first preset opening position under the action of the gas pressure, the explosion valve can be kept in the preset opening state, the exhaust and pressure relief can be continuously smooth, and the stability of the explosion and the exhaust capacity before and after the explosion can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is an explosion structure diagram of the explosion valve of the preferred embodiment of the utility model.

[0018] Fig. 2 It is a half cut structure diagram (closed state) of the explosion valve of the preferred embodiment of the utility model.

[0019] Fig. 3 It is a half cut structure diagram (open state) of the explosion valve of the preferred embodiment of the utility model.

[0020] Fig. 4 It is an explosion structure diagram of the valve cover of the preferred embodiment of the utility model.

[0021] Wherein: 1, valve body; 11, cylinder body; 12, support; 13, guide sleeve; 14, external thread; 2, valve rod; 21, internal thread hole; 3, valve cover; 31, containing space; 32, bottom cover; 321, first sink groove; 322, second sink groove; 323, inner vent hole; 33, top cover; 331, convex ring; 332, inclined groove; 34, stud; 4, limiting piece; 5, first reset spring; 6, reset stopper; 61, guide sleeve; 611, connecting plate; 612, first side plate; 613, second side plate; 62, limiting plate; 63, cutter head; 64, guide rod; 65, second reset spring; 7, metal sheet; 8, first sealing ring; 9, second sealing ring. DETAILED DESCRIPTION

[0022] The utility model will be further explained in connection with the drawings and specific embodiments.

[0023] As Figs. 1-4 shown, the explosion-proof valve of the embodiment includes a valve body 1, a valve core, a first reset spring 5 and a reset stopper 6. Among them, the valve body 1 includes a hollow barrel 11 with both ends open and a guide sleeve 13 connected in the barrel 11 through a support 12. The valve core includes a valve rod 2 slidingly inserted into the guide sleeve 13, a valve cover 3 connected to one end of the valve rod 2 and a limiting piece 4 connected to the other end of the valve rod 2. The first reset spring 5 is sleeved on the valve rod 2, one end of the first reset spring 5 elastically abuts against the support 12, and the other end elastically abuts against the limiting piece 4. The first reset spring 5 provides a spring force to make the valve cover 3 have a tendency to abut against the valve body 1, which can not only make the valve cover 3 abut against the valve body 1 to close one side port of the barrel 11 when the battery pack is working normally, but also drive the valve core to reset before the valve core slides to the first preset opening position. The reset stopper 6 is connected to the valve body 1 and can limit the reset of the valve core after the valve core moves to the first preset opening position, so that the valve core can be kept in the preset opening state to continuously and smoothly exhaust and depressurize, thereby improving the stability of explosion and the exhaust capacity before and after explosion.

[0024] Specifically, in order to facilitate the assembly of the valve core, one end of the valve rod 2 of the embodiment is provided with an internal threaded hole 21, and the valve cover 3 is formed with a stud 34 matched with the internal threaded hole 21.

[0025] The contact surface between the valve body 1 and the valve cover 3 of the embodiment is provided with a first sealing ring 8 embedded on the valve body 1 or the valve cover 3, and the end of the valve body 1 away from the valve cover 3 is provided with an external thread 14 and sleeved with a second sealing ring 9.

[0026] The reset stopper 6 of the embodiment includes a guide sleeve 61, a limiting plate 62, a tool bit 63, a guide rod 64 and a second reset spring 65, wherein the guide sleeve 61 is connected to the valve body 1 on one side of the valve core, the limiting plate 62 is arranged on the side of the guide sleeve 61 away from the valve core, the tool bit 63 is arranged on the side of the guide sleeve 61 close to the valve core and above the limiting piece 4, the side surface of the tool bit 63 facing the limiting piece 4 is configured as an inclined surface or an arc surface, the guide rod 64 is inserted into the guide sleeve 61 and connected with the limiting plate 62 and the tool bit 63 respectively, and the second reset spring 65 is sleeved on the guide rod 64 and elastically abuts against between the guide sleeve 61 and the tool bit 63.

[0027] When the valve core moves up to open the one side port of the valve body 1 to exhaust under the action of the gas pressure inside the battery pack, the limiting piece 4 of the valve core will first abut against the cutter head 63 above it, drive the cutter head 63 to slide in the guide sleeve 61, compress the second reset spring 65, until the limiting piece 4 continues to move up to be separated from the cutter head 63, at this time, the cutter head 63 is reset under the action of the second reset spring 65, the cutter head 63 is below the limiting piece 4, used to block the limiting piece 4, limit the valve core to reset under the action of the first reset spring 5 when the gas pressure inside the battery pack decreases.

[0028] In order to facilitate the assembly of the reset stop 6, in a feasible option of the utility model, the guide sleeve 61 includes a connecting plate 611, a first side plate 612 and a second side plate 613, the connecting plate 611 is detachably connected with the support 12 through bolts, the first side plate 612 is fixed to one side of the connecting plate 611 away from the valve core, a first insertion hole for inserting the guide rod 64 is formed in the first side plate 612, the second side plate 613 is fixed to one side of the connecting plate 611 close to the valve core, a second insertion hole for inserting the cutter head 63 is formed in the second side plate 613. One end of the guide rod 64 is integrally formed with the cutter head 63, the other end is detachably connected (such as threaded connection or buckle connection) with the limiting plate 62 in sequence through the second insertion hole and the first insertion hole, and the second reset spring 65 is elastically abutted between the first side plate 612 and the cutter head 63. The guide sleeve 61 has compact structure, and is beneficial to the miniaturization of the explosion-proof valve.

[0029] The valve cover 3 of the embodiment is made of plastic, and a containing space 31 is formed in the valve cover 3, and a metal sheet 7 capable of being attracted by a magnet is arranged in the containing space 31. By attracting the metal sheet 7 by the magnet, the valve core can be driven to move up to open the explosion-proof valve and perform the airtightness test.

[0030] The valve cover 3 of the embodiment includes a bottom cover 32 and a top cover 33 which are stacked, a first recess 321 is formed in the top surface of the bottom cover 32, and a convex ring 331 which is in interference fit with the first recess 321 is formed downwardly protruding from the bottom surface of the top cover 33. The top cover 33, the convex ring 331 and the first recess 321 define the above-mentioned containing space 31. The structural design of the valve cover 3 facilitates the forming of the containing space 31 and the installation of the metal sheet 7.

[0031] In order to make the explosion-proof valve play the role of a breather valve when the battery pack is normally working, and realize the balance of the gas pressure inside and outside the battery pack. An outer gas permeation hole which is in communication with the outside is formed between the top cover 33 and the bottom cover 32 of the embodiment, an intermediate gas permeation hole which is in communication with the outer gas permeation hole and the containing space 31 is formed between the convex ring 331 and the bottom cover 32, and an inner gas permeation hole 323 which is in communication with the containing space 31 and the valve body 1 is formed in the bottom cover 32. When the explosion-proof valve is not opened, the circulation of the gas inside and outside the battery pack is realized through the inner gas permeation hole 323, the intermediate gas permeation hole and the outer gas permeation hole, and at the same time, due to the certain tortuosity of the gas flow channel, it can also play a certain waterproof and dustproof effect.

[0032] In order to facilitate processing each air hole, the valve cover 3 is specifically configured as a convex ring 331 bottom surface and the first groove 321 groove bottom has a gap, the bottom cover 32 top surface is provided with a second groove 322 penetrating the outer peripheral wall of the bottom cover 32 and the inner peripheral wall of the first groove 321, so that the second groove 322 and the bottom surface of the top cover 33 form the above-mentioned outer air hole, the outer peripheral wall of the convex ring 331 is provided with a plurality of circumferentially spaced inclined grooves 332, one end of the inclined groove 332 extends to the bottom surface of the top cover 33 and the other end extends to the bottom surface of the convex ring 331, the inclined groove 332 and the inner peripheral wall of the first groove 321 form the above-mentioned intermediate air hole.

[0033] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, it should be understood by those skilled in the art that various changes can be made to the utility model in form and details without departing from the spirit and scope of the utility model defined in the appended claims, and all of them are within the protection scope of the utility model.

Claims

1. An explosion relief valve, characterized in that The utility model relates to a valve, which comprises a valve body (1) and a valve core. The valve body (1) comprises a hollow cylinder (11) with two open ends and a guide sleeve (13) connected to the cylinder (11) by a support (12). The valve core comprises a valve rod (2) slidingly inserted into the guide sleeve (13), a valve cover (3) connected to one end of the valve rod (2), and a limiting member (4) connected to the other end of the valve rod (2). A first reset spring (5) is sleeved on the valve rod (2) and elastically abuts between the support (12) and the limiting member (4), which drives the valve cover (3) to close one side port of the cylinder (11) and resets the valve core before the valve core slides to a first preset opening position. A reset stopper (6) is connected to the valve body (1) to limit the reset of the valve core after the valve core moves to the first preset opening position.

2. The explosion relief valve of claim 1, wherein The reset stopper (6) comprises a guide sleeve (61), a limiting plate (62), a cutter head (63), a guide rod (64), and a second reset spring (65). The guide sleeve (61) is connected to the valve body (1) on one side of the valve core, the limiting plate (62) is arranged on the side of the guide sleeve (61) away from the valve core, the cutter head (63) is arranged on the side of the guide sleeve (61) close to the valve core and above the limiting member (4), the guide rod (64) is slidingly inserted into the guide sleeve (61) and connected to the limiting plate (62) and the cutter head (63) respectively, and the second reset spring (65) is sleeved on the guide rod (64) and elastically abuts between the guide sleeve (61) and the cutter head (63).

3. The explosion relief valve of claim 2, wherein, The guide sleeve (61) comprises a connecting plate (611) connected to the support (12) by a bolt, a first side plate (612) connected to the side of the connecting plate (611) away from the valve core, and a second side plate (613) connected to the side of the connecting plate (611) close to the valve core.

4. Explosion relief valve according to claim 2 or 3, characterized in that The first side plate (612) is provided with a first insertion hole for the insertion of the guide rod (64), and the second side plate (613) is provided with a second insertion hole for the insertion of the cutter head (63).

5. The explosion relief valve of claim 1, wherein, One end of the guide rod (64) is connected to the cutter head (63), and the other end is sequentially connected to the limiting plate (62) through the second insertion hole and the first insertion hole.

6. The explosion relief valve of claim 5, wherein, The side surface of the cutter head (63) facing the limiting member (4) is configured as an inclined surface or an arc surface. The valve cover (3) is made of plastic, and a containing space (31) is formed in the valve cover (3). The valve cover (3) comprises a bottom cover (32) and a top cover (33) stacked together. The top surface of the bottom cover (32) is provided with a first recess (321), the bottom surface of the top cover (33) downwardly protrudes to form a convex ring (331) in interference fit with the first recess (321), and the top cover (33), the convex ring (331), and the first recess (321) define the containing space (31).

7. The explosion relief valve of claim 6, wherein, The top cover (33) and the bottom cover (32) form an outer air permeable hole which communicates with the outside, the convex ring (331) and the bottom cover (32) form an intermediate air permeable hole which communicates the outer air permeable hole and the accommodating space (31), and the bottom cover (32) is provided with a plurality of inner air permeable holes (323) which communicate with the valve body (1) in the accommodating space (31).

8. The explosion relief valve of claim 7, wherein, The bottom surface of the convex ring (331) and the bottom of the first sunken groove (321) have a gap, the top surface of the bottom cover (32) is provided with a second sunken groove (322) which penetrates the outer peripheral wall of the bottom cover (32) and the inner peripheral wall of the first sunken groove (321), the second sunken groove (322) and the bottom surface of the top cover (33) form the outer air permeable hole, the outer peripheral wall of the convex ring (331) is provided with a plurality of inclined grooves (332) which are arranged in a circumferential direction and are spaced apart, one end of the inclined groove (332) extends to the bottom surface of the top cover (33), and the other end extends to the bottom surface of the convex ring (331), and the inclined groove (332) and the inner peripheral wall of the first sunken groove (321) form the intermediate air permeable hole.

9. The explosion-proof valve according to claim 1, wherein The contact surface between the valve body (1) and the valve cover (3) is provided with a first sealing ring (8) which is embedded in the valve body (1) or the valve cover (3); The end of the valve body (1) which is away from the valve cover (3) is provided with an outer thread (14) and is sleeved with a second sealing ring (9).

10. The explosion relief valve of claim 1, wherein, One end of the valve rod (2) is provided with an inner thread hole (21), and the valve cover (3) is protruded to form a stud (34) which cooperates with the inner thread hole (21).

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