Explosion-proof valve, battery pack and electric equipment

Abstract

The utility model relates to the technical field of battery assembling and manufacturing, in particular to an anti-explosion valve, a battery pack and electric equipment. The anti-explosion valve comprises an anti-explosion valve main body which is provided with a sealing groove; the main body sealing ring is arranged in the sealing groove, and the main body sealing ring is provided with a lip; and the fixing seat is arranged on the explosion-proof valve main body so as to abut against the main body sealing ring arranged in the sealing groove, and sealing is formed between the fixing seat and the explosion-proof valve main body. Compared with an O-shaped sealing ring, the main body sealing ring is arranged between the explosion-proof valve main body and the fixed seat, so that when the explosion-proof valve is extruded, a blank between lips of the main body sealing ring is filled, and a gap between a sealing groove and the fixed seat is reduced; due to the fact that the blank buffer space exists between the lips of the main body sealing ring, the main body sealing ring is larger than an O-shaped sealing ring in compression amount under the same loading force value compared with the O-shaped sealing ring, the sealing effect of the anti-explosion valve can be improved under the low valve opening pressure, and the problem of insulation failure of a battery pack is solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery assembly and manufacturing, and in particular to an explosion-proof valve, a battery pack, and electrical equipment. Background Art

[0002] At present, when batteries are assembled and manufactured, explosion-proof valves are usually installed on the casing to improve the safety performance of the batteries. The sealing performance is crucial to the reliability of the explosion-proof valve.

[0003] However, when heat diffusion occurs in the battery pack, in order to discharge the gas while avoiding damage to other components in the battery pack, the explosion-proof valve needs to be opened under low pressure. At this time, the load value on the sealing ring is low, so the compression amount of the sealing ring is small, which can easily cause insufficient sealing of the sealing ring, resulting in sealing failure of the battery pack explosion-proof valve, and further causing insulation failure of the battery pack. Utility Model Content

[0004] Based on this, the present application provides an explosion-proof valve, a battery pack and an electrical device to solve the problem that when the valve is opened at low pressure, the explosion-proof valve is easily insufficiently sealed, resulting in sealing failure, and the insulation failure of the battery pack.

[0005] In one aspect, the present application provides an explosion-proof valve, comprising:

[0006] The explosion-proof valve body has a through-hole and a sealing groove arranged on the explosion-proof valve body, and the sealing groove is arranged around the through-hole;

[0007] The main body sealing ring is arranged in the sealing groove and has at least one lip;

[0008] The fixing seat is arranged on the explosion-proof valve body and covers a through-hole to press against the main body sealing ring arranged in the sealing groove to form a seal between the fixing seat and the explosion-proof valve body.

[0009] In a possible implementation, the main body sealing ring is in the shape of a ring disposed around the center line of the through opening.

[0010] In one possible implementation, along the cross section passing through the center line of the through opening, the cross section of the main body sealing ring has a first lip, a second lip, a third lip and a fourth lip, wherein the first lip and the second lip are located on the side of the main body sealing ring close to the center line of the through opening, and the third lip and the fourth lip are located on the side of the main body sealing ring away from the center line of the through opening.

[0011] In a possible implementation, along a cross section passing through a center line of the through opening, the cross-sectional radius of the first lip, the second lip, the third lip, and the fourth lip of the main body sealing ring is r1, and r1 satisfies: 0.22 mm ≤ r1 ≤ 0.30 mm.

[0012] In a possible implementation, along a cross section through a center line of the through opening, the cross-sectional diameter of the main body sealing ring is W, and W satisfies: 1.78 mm ≤ W ≤ 2.62 mm; and / or,

[0013] The inner diameter of the main sealing ring is d1, and d1 satisfies: 34.0mm≤d1≤40.0mm; and / or,

[0014] The filling rate of the main sealing ring in the sealing groove is a, where a satisfies: 80%≤a≤95%; and / or,

[0015] The width of the sealing groove is b1, and b1 satisfies: 1.70 mm ≤ b1 ≤ 2.25 mm; and / or,

[0016] The depth of the sealing groove is h1, and h1 satisfies: 1.40mm≤h1≤2.25mm.

[0017] In a possible implementation, an anti-slip rib is provided in the sealing groove, and the anti-slip rib is provided on a side wall of the sealing groove and adjacent to an opening of the sealing groove;

[0018] When the main sealing ring is arranged in the sealing groove, the first lip and the second lip are located on both sides of the anti-slip rib on the side wall of the sealing groove close to the center line of the through opening; and / or

[0019] The third lip and the fourth lip are located on both sides of the anti-slip rib of the side wall of the sealing groove away from the center line of the through opening.

[0020] In a possible implementation, the main body sealing ring is made of water-swelling rubber.

[0021] In a possible implementation, the main body sealing ring is a two-lip sealing ring or a three-lip sealing ring.

[0022] In one possible implementation, the explosion-proof valve also includes an elastic member and a guide shaft. The guide shaft is passed through the explosion-proof valve body, the fixed seat is connected to the guide shaft, the elastic member is sleeved on the guide shaft, and is located on the side of the explosion-proof valve body away from the fixed seat. One end of the elastic member is supported on the explosion-proof valve body, and the other end is supported on the end of the guide shaft away from the explosion-proof valve body.

[0023] In a possible implementation, the explosion-proof valve further includes a pressure cover, which is disposed on a side of the fixing seat away from the explosion-proof valve body and is connected to the fixing seat.

[0024] In a possible implementation, the explosion-proof valve further includes a liquid-proof breathable membrane, the fixing seat is provided with a breathable hole, and the liquid-proof breathable membrane is provided on one side of the fixing seat and covers the breathable hole.

[0025] In a possible implementation, the explosion-proof valve further includes an outer sealing ring. The explosion-proof valve body is provided with a groove, which is provided on a side of the explosion-proof valve body away from the fixing seat, and the outer sealing ring is provided in the groove.

[0026] On the other hand, the present application provides a battery pack, including a battery and a shell, the battery is arranged in the shell, and the shell is provided with the above-mentioned explosion-proof valve.

[0027] On the other hand, the present application provides an electrical device including the above-mentioned battery pack.

[0028] The explosion-proof valve, battery pack, and electrical equipment provided by the present application form a seal between the explosion-proof valve body and the fixed seat by providing a main body sealing ring between the explosion-proof valve body and the fixed seat. Compared to an O-ring, when squeezed, the blank space between the lips of the main body sealing ring is filled, thereby reducing the gap between the sealing groove and the fixed seat. Due to the blank buffer space between the lips of the main body sealing ring, the main body sealing ring is compressed more than the O-ring under the same load value, thereby increasing the sealing effect of the explosion-proof valve. That is, even under low valve opening pressure, the main body sealing ring has sufficient compression to ensure the sealing effect of the explosion-proof valve, thereby reducing the problem of insulation failure in the battery pack. In addition, a lubrication cavity can be formed between the sealing lips of the main body sealing ring, which has low friction resistance and starting resistance. The non-circular cross-section can avoid rolling during reciprocating motion, and the wear resistance is also good, which increases the service life of the main body sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 It is a structural diagram of an explosion-proof valve in the prior art;

[0031] Figure 2 A schematic diagram of the structure of the explosion-proof valve provided in an embodiment of the present application;

[0032] Figure 3 for Figure 2 The structural diagram of the main sealing ring of the explosion-proof valve shown in FIG.

[0033] Figure 4 for Figure 2 The structural diagram of the main body sealing ring of the explosion-proof valve shown is installed in the sealing groove;

[0034] Figure 5This is a schematic diagram of the structure of the O-ring of the explosion-proof valve in the prior art when it is not under load;

[0035] Figure 6 This is a schematic structural diagram of the main body sealing ring of the explosion-proof valve in the embodiment of the present application when it is not under load;

[0036] Figure 7 This is a schematic diagram of the structure of the O-ring of the explosion-proof valve in the prior art when it is under load;

[0037] Figure 8 This is a schematic structural diagram of the main sealing ring of the explosion-proof valve when it is under load in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 100-explosion-proof valve; 10-explosion-proof valve body; 11-sealing groove; 12-anti-drop rib; 13-groove; 14-through port; 15-sleeve; 20-fixed seat; 21-guide shaft; 22-air vent; 30-main body sealing ring; 31-first lip; 32-second lip; 33-third lip; 34-fourth lip; 40-elastic part; 50-pressure cover; 60-liquid-proof breathable membrane; 70-outer sealing ring; 200-O-ring. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0042] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0043] The terms "first", "second" and "third" (if any) in the description and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0044] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0045] At present, when batteries are assembled and manufactured, explosion-proof valves are usually installed on the casing to improve the safety performance of the batteries. The sealing performance is crucial to the reliability of the explosion-proof valve.

[0046] like Figure 1 As shown, in existing designs, an O-ring 200 is typically provided between the explosion-proof valve body 10 and the fixing seat 20. By squeezing the O-ring 200, the gap between the explosion-proof valve body 10 and the fixing seat 20 is filled, thereby achieving a sealing effect between the explosion-proof valve body 10 and the fixing seat 20. However, when heat diffusion occurs in the battery pack, in order to discharge gas while avoiding damage to other components in the battery pack, the explosion-proof valve needs to be opened at a low pressure. That is, the opening pressure of the battery pack explosion-proof valve is relatively low, generally between 3 kPa and 10 kPa. Since the opening pressure of the explosion-proof valve is proportional to the load on the sealing ring, the load on the O-ring 200 is relatively low at this time. Therefore, the compression of the O-ring 200 is relatively small, which can easily lead to insufficient sealing of the O-ring 200, resulting in sealing failure of the battery pack explosion-proof valve and further insulation failure of the battery pack.

[0047] After repeated consideration and verification, the inventors discovered that, compared to the O-ring 200, if a main body sealing ring (also known as a star ring) is used to seal the explosion-proof valve, when squeezed, the blank space between the lips of the main body sealing ring is filled, reducing the gap between the sealing groove and the fixed seat. Due to the blank buffer space between the lips of the main body sealing ring, the main body sealing ring is compressed more than the O-ring 200 under the same load force value, thereby increasing the sealing effect of the explosion-proof valve. That is, under low valve opening pressure, the main body sealing ring also has sufficient compression to ensure the sealing effect of the explosion-proof valve, reducing the problem of insulation failure in the battery pack. In addition, a lubrication cavity can be formed between the sealing lips of the main body sealing ring, which has lower friction resistance and starting resistance. The non-circular cross-section can avoid rolling during reciprocating motion, and the wear resistance is also good, which increases the service life of the main body sealing ring.

[0048] In view of this, the present application provides an explosion-proof valve, including: an explosion-proof valve body, the explosion-proof valve body has a through-opening, a sealing groove is provided on the explosion-proof valve body, and the sealing groove is arranged around the through-opening; a main body sealing ring, the main body sealing ring is arranged in the sealing groove, and the main body sealing ring has at least one lip; a fixed seat, the fixed seat is arranged on the explosion-proof valve body, and covers the through-opening, and presses against the main body sealing ring arranged in the sealing groove to form a seal between the fixed seat and the explosion-proof valve body.

[0049] By disposing a main body sealing ring between the explosion-proof valve body and the fixed seat, and by using the main body sealing ring to form a seal between the explosion-proof valve body and the fixed seat, compared to the O-ring 200, when squeezed, the blank space between the main body sealing ring lips is filled, thereby reducing the gap between the sealing groove and the fixed seat. Due to the blank buffer space between the main body sealing ring lips, the main body sealing ring is compressed more than the O-ring 200 under the same load value, thereby enhancing the sealing effect of the explosion-proof valve. That is, even at low valve opening pressure, the main body sealing ring has sufficient compression to ensure the sealing effect of the explosion-proof valve, reducing the problem of insulation failure in the battery pack. In addition, a lubrication cavity can be formed between the sealing lips of the main body sealing ring, which has low friction resistance and starting resistance. The non-circular cross-section can avoid rolling during reciprocating motion, and the wear resistance is also good, which increases the service life of the main body sealing ring.

[0050] The contents of this application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of this application more clearly and in detail.

[0051] Figure 1 It is a structural diagram of an explosion-proof valve in the prior art. Figure 2 This is a schematic diagram of the structure of the explosion-proof valve provided in an embodiment of the present application. Figure 3 for Figure 2Schematic diagram of the structure of the main sealing ring of the explosion-proof valve shown. Figure 4 for Figure 2 The diagram shows the structure of the main body sealing ring of the explosion-proof valve installed in the sealing groove. Figure 5 This is a schematic diagram of the structure of the O-ring of the explosion-proof valve in the prior art when it is not under load. Figure 6 This is a schematic structural diagram of the main body sealing ring of the explosion-proof valve in the embodiment of the present application when it is not under load. Figure 7 This is a schematic diagram of the structure of the O-ring of the explosion-proof valve in the prior art when it is loaded. Figure 8 This is a schematic structural diagram of the main sealing ring of the explosion-proof valve when it is under load in an embodiment of the present application.

[0052] like Figure 2 As shown, an explosion-proof valve 100 provided in an embodiment of the present application is used in a battery pack. The explosion-proof valve 100 includes a valve body 10 and a fixing base 20. The valve body 10 is mounted on the battery pack housing. The fixing base 20 is mounted on the valve body 10. The valve body 10 has a through-hole 14. The through-hole 14 extends through both sides of the valve body 10.

[0053] The explosion-proof valve body 10 is provided with a sealing groove 11. The sealing groove 11 is provided around the through-opening 14. The sealing groove 11 is opened toward the fixing seat 20.

[0054] The fixing seat 20 covers the sealing groove 11 and the through-opening 14 , thereby sealing the through-opening 14 .

[0055] The explosion-proof valve 100 further includes a main body sealing ring 30. The main body sealing ring 30 is disposed in the sealing groove 11. The main body sealing ring 30 has at least one lip.

[0056] When the fixing seat 20 is connected to the explosion-proof valve body 10, the fixing seat 20 moves toward the opening direction of the sealing groove 11, squeezing the main body sealing ring 30 provided in the sealing groove 11, causing the main body sealing ring 30 to be deformed under the load, so that the main body sealing ring 30 fills the gap between the explosion-proof valve body 10 and the fixing seat 20, forming a seal between the fixing seat 20 and the explosion-proof valve body 10.

[0057] The main body seal ring 30 replaces the O-ring 200. When squeezed, the blank space between the lips of the main body seal ring 30 is filled, reducing the gap between the sealing groove 11 and the fixed seat 20. Due to the blank buffer space between the lips of the main body seal ring 30, the main body seal ring 30 is compressed more than the O-ring 200 under the same load value, thereby enhancing the sealing effect of the explosion-proof valve 100. That is, even under low valve opening pressure, the main body seal ring 30 has sufficient compression to ensure the sealing effect of the explosion-proof valve 100, reducing the problem of insulation failure in the battery pack. In addition, a lubrication cavity can be formed between the sealing lips of the main body seal ring 30, which has low friction resistance and starting resistance. The non-circular cross-section can avoid rolling during reciprocating motion, and the wear resistance is also good, which increases the service life of the main body seal ring 30.

[0058] In some possible implementations, the main body sealing ring 30 is an X-shaped sealing ring, but is not limited thereto. In other embodiments, the main body sealing ring 30 may also be a sealing ring with one, two, three, five or more lips.

[0059] In some possible implementations, the main body sealing ring 30 is a two-lip sealing ring or a three-lip sealing ring.

[0060] like Figure 3 As shown, the main body sealing ring 30 is annular and arranged around the center line of the through-opening 14 .

[0061] Along a cross section through the centerline of the through-opening 14, the main body sealing ring 30 has four lips: a first lip 31, a second lip 32, a third lip 33, and a fourth lip 34. The first lip 31 and the second lip 32 are located on the side of the main body sealing ring 30 closer to the centerline of the through-opening 14, while the third lip 33 and the fourth lip 34 are located on the side of the main body sealing ring 30 farther from the centerline of the through-opening 14.

[0062] In a possible implementation, along a cross section passing through a center line of the through opening, the cross-sectional diameter of the main body sealing ring 30 is W, and W satisfies: 1.78 mm ≤ W ≤ 2.62 mm.

[0063] In a possible implementation, the inner diameter of the main body sealing ring 30 is d1, and d1 satisfies: 34.0 mm≤d1≤40.0 mm.

[0064] like Figure 4 As shown, in a possible implementation, along the cross section passing through the center line of the through opening, the cross-sectional radius of the first lip 31, the second lip 32, the third lip 33 and the fourth lip 34 of the main sealing ring 30 is r1, and r1 satisfies: 0.22mm≤r1≤0.30mm.

[0065] In a possible implementation, the width of the sealing groove 11 is b1, and b1 satisfies: 1.70 mm ≤ b1 ≤ 2.25 mm.

[0066] In a possible implementation, the depth of the sealing groove 11 is h1, and h1 satisfies: 1.40 mm ≤ h1 ≤ 2.25 mm.

[0067] like Figures 5 to 8 FIG. 1 shows a comparison between the O-ring 200 and the main body sealing ring 30 when not loaded and when loaded.

[0068] like Figure 5 and Figure 6 As shown, compared to the O-ring 200, the main body seal ring 30 has a blank buffer space between its lips, forming a lubrication cavity and improving startup conditions. Furthermore, since the main body seal ring 30 has four sealing lips in its cross-section, it does not twist in the sealing groove 11 and therefore does not roll in the sealing groove 11 during reciprocating motion.

[0069] like Figure 7 and Figure 8 As shown, when subjected to load, the blank buffer space between the lips of the main sealing ring 30 is filled, so that the gap between the sealing groove 11 and the fixing seat 20 is reduced; since there is a blank buffer space between the lips of the main sealing ring 30, the compression amount of the main sealing ring 30 is greater than that of the O-ring 200 under the same load force value, thereby enhancing the sealing effect.

[0070] like Figure 4 As shown, in a possible implementation, an anti-slip rib 12 is provided in the sealing groove 11. The anti-slip rib 12 is provided on the side wall of the sealing groove 11 and adjacent to the opening of the sealing groove 11.

[0071] The anti-slip rib 12 is used to prevent the main body sealing ring 30 from slipping out of the sealing groove 11, thereby improving assembly efficiency and sealing effect during use.

[0072] Specifically, there are two anti-slip ribs 12, one on each sidewall of the sealing groove 11. Each anti-slip rib 12 is located between two lips on the sidewall of the main sealing ring 30 near the sealing groove 11. That is, when the main sealing ring 30 is located in the sealing groove 11, the first lip 31 and the second lip 32 are located on either side of the anti-slip rib 12 on the sidewall of the sealing groove 11 near the centerline of the through-opening 14; the third lip 33 and the fourth lip 34 are located on either side of the anti-slip rib 12 on the sidewall of the sealing groove 11 away from the centerline of the through-opening 14.

[0073] In a possible implementation, the end surface of the anti-slip rib 12 is an arc surface, which is used to prevent the anti-slip rib 12 from scratching and damaging the main body sealing ring 30 during the compression process of the main body sealing ring 30.

[0074] Specifically, the anti-slip rib 12 may be provided with chamfers, rounded corners or other transition surfaces.

[0075] In a possible implementation, the rounded corners on the anti-slip rib 12 are designed to be between 110° and 120°.

[0076] In addition, the size of the anti-drop rib 12 should not be too large, otherwise it will affect the compression effect of the main body sealing ring 30 in the sealing groove 11.

[0077] In a possible implementation, in the explosion-proof valve 100 , the filling rate of the main body sealing ring 30 in the sealing groove 11 is a, that is, the ratio of the volume of the main body sealing ring 30 in the sealing groove 11 to the volume of the sealing groove 11 .

[0078] a satisfies: 80%≤a≤95%.

[0079] When the explosion-proof valve 100 is in a closed state, the main body sealing ring 30 is squeezed into the sealing groove 11 by the explosion-proof valve body 10 and the fixing seat 20 . Therefore, the filling rate of the main body sealing ring 30 needs to be ensured to ensure the sealing effect of the explosion-proof valve 100 .

[0080] In a possible implementation, the main body sealing ring 30 is made of water-swelling rubber.

[0081] Water-swelling rubber (WSR) is a specialty rubber that multiplies its volume and mass after absorbing water, thus providing dual water-stopping functions: elastic and expansion-type water-stopping. When the battery pack operates in harsh operating conditions, such as muddy water or rainy weather, if even a small amount of water enters the explosion-proof valve 100, the main sealing ring 30, made of WSR, will immediately expand, instantly filling the space between the sealing groove 11 and the fixing seat 20, preventing water from entering the battery pack and further ensuring the sealing effect of the explosion-proof valve 100.

[0082] In a possible implementation, the main body sealing ring 30 is made of water-swellable rubber with a low expansion rate.

[0083] According to the water absorption performance, water-swelling rubber can be divided into types such as high expansion rate (350%), medium expansion (200-350%), and low expansion rate (50-200%). Since the gap between the sealing groove 11 in the explosion-proof valve body 10 and the fixing seat 20 in the explosion-proof valve 100 is small, a water-swelling rubber with an expansion rate of 50% can be selected.

[0084] In a possible implementation, the main body sealing ring 30 is made of water-swellable rubber with a natural rubber matrix.

[0085] Currently, the rubber matrix used to prepare water-swelling rubber includes chloroprene rubber (CR), natural rubber (NR), styrene butadiene rubber (SBR), nitrile butadiene rubber (NBR), and ethylene propylene diene monomer (EPDM). Since the explosion-proof valve 100 uses a water-swelling rubber with a low expansion rate, the water-swelling rubber matrix of the main body seal ring 30 is natural rubber.

[0086] In a possible implementation, the water-swelling rubber selected for the main body sealing ring 30 also includes a compatibilizer and a reinforcing agent.

[0087] Commonly used water-absorbing resins have strong polarity and cohesive properties, resulting in uneven dispersion within the rubber matrix. When water enters the matrix, they easily escape into the surrounding medium, resulting in a high rate of weight loss and making repeated use unsuitable. Therefore, a binder or compatibilizer is needed to improve the dispersion of the water-absorbing resin and enhance its compatibility with the rubber matrix.

[0088] In a possible implementation, sodium polyacrylate with strong compatibility is selected as a compatibilizer in the main body sealing ring 30 .

[0089] Because natural rubber swells after absorbing water, the water acts as a plasticizer, reducing the strength of the material. Therefore, it is necessary to add high-strength inorganic fillers such as carbon black, white carbon black, and clay as reinforcing agents to not only improve the strength of the material but also reduce costs.

[0090] In one possible implementation, clay is used as a reinforcing agent in the main body sealing ring 30. Since carbon black is polluting and white carbon black has a weak interaction with rubber, clay is used as a reinforcing agent.

[0091] In a possible implementation, the explosion-proof valve 100 further includes an elastic member 40 . The elastic member 40 is provided on the explosion-proof valve body 10 and abuts against the fixing seat 20 .

[0092] Specifically, the explosion-proof valve 100 also includes a guide shaft 21, which is passed through the explosion-proof valve body 10, and the fixed seat 20 is connected to the guide shaft 21. The elastic member 40 is sleeved on the guide shaft 21 and is located on the side of the explosion-proof valve body 10 away from the fixed seat 20. One end of the elastic member 40 abuts against the explosion-proof valve body 10, and the other end abuts against the end of the guide shaft 21 away from the explosion-proof valve body 10, so that the elastic member 40 and the fixed seat 20 are abutted through the guide shaft 21.

[0093] When the explosion-proof valve 100 is closed, the force applied to the elastic member 40 is equal to the force applied to the main body sealing ring 30 and the fixing seat 20. When the explosion-proof valve 100 is opened, the elastic member 40 pushes the fixing seat 20 away. At this time, the fixing seat 20 and the main body sealing ring 30 are no longer in contact, and a certain gap is formed between them.

[0094] In a possible implementation, the elastic member 40 is a spring.

[0095] In one possible implementation, a sleeve 15 is provided on the side of the explosion-proof valve body 10 away from the sealing groove 11. The guide shaft 21 and the elastic member 40 are both disposed in the sleeve 15, and the fixed seat 20 is moved within the sleeve 15, thereby achieving the sealing and opening of the through-port 14, realizing the functions of valve opening for exhaust and sealing and waterproofing.

[0096] In a possible implementation, the explosion-proof valve 100 further includes a pressure cover 50 . The pressure cover 50 is connected to the fixing seat 20 and covers a side of the fixing seat 20 facing away from the explosion-proof valve body 10 .

[0097] There is a certain gap between the pressure cover 50 and the fixing seat 20. When the explosion-proof valve 100 is opened and the fixing seat 20 is pushed open, the gap between the pressure cover 50 and the fixing seat 20 allows gas to be discharged, thereby reducing the pressure of the battery pack.

[0098] In one possible implementation, the explosion-proof valve 100 further includes a liquid-proof and breathable membrane 60, which is disposed on the fixing seat 20 and located between the fixing seat 20 and the gland 50. The liquid-proof and breathable membrane 60 is used to achieve internal and external pressure balance by exchanging internal and external gases under normal pressure to provide waterproofing and ventilation.

[0099] Specifically, the fixing seat 20 is provided with a vent hole 22 which passes through the fixing seat 20. The liquid-proof vent membrane 60 is provided on a side of the fixing seat 20 away from the explosion-proof valve body 10 and covers the vent hole 22 to seal the vent hole 22.

[0100] The pressure cover 50 is also used to protect the liquid-proof and breathable membrane 60 provided on the fixing seat 20 .

[0101] Specifically, the pressure cover 50 is connected to the fixing seat 20 by interference fit. There is a maze-like space between the pressure cover 50 and the fixing seat 20 for the exhaust air flow channel. The pressure cover 50 is arranged outside the fixing seat 20 to protect the liquid-proof breathable membrane 60 to achieve exhaust, and at the same time form a barrier protection for the explosion-proof valve body 10 to prevent external foreign matter, such as mud, water and other impurities, from entering the exhaust path and damaging the main body sealing ring 30.

[0102] In a possible implementation, the explosion-proof valve 100 further includes an outer sealing ring 70 . The explosion-proof valve body 10 is provided with a groove 13 , and the outer sealing ring 70 is disposed in the groove 13 .

[0103] Specifically, the groove 13 is located on the side of the explosion-proof valve body 10 away from the fixing seat 20. That is, the groove 13 and the sealing groove 11 are located on either side of the explosion-proof valve body 10. The explosion-proof valve 100 is installed on the battery pack housing, and the outer sealing ring 70 is provided between the explosion-proof valve body 10 and the battery pack housing to seal the gap between the explosion-proof valve 100 and the battery pack housing.

[0104] In a possible implementation, the outer sealing ring 70 is also made of water-swelling rubber.

[0105] Furthermore, since the gap between the groove 13 on the explosion-proof valve body 10 and the shell is relatively small, a water-swellable rubber with an expansion rate of 50% can be selected.

[0106] Since in the explosion-proof valve 100, only the sealing ring provided between the explosion-proof valve body 10 and the fixing seat 20, namely the main body sealing ring 30, has a direct impact on the valve opening pressure, the outer sealing ring 70 is only used to simply seal the gap between the explosion-proof valve 100 and the battery pack shell. Therefore, the outer sealing ring 70 can be an O-ring to reduce costs.

[0107] The explosion-proof valve 100 provided in the embodiment of the present application includes an explosion-proof valve body 10, a fixing seat 20 and a body sealing ring 30. The explosion-proof valve body 10 is provided with a sealing groove 11, and the body sealing ring 30 is provided in the sealing groove 11. The fixing seat 20 is provided on the explosion-proof valve body 10 and presses against the body sealing ring 30 provided in the sealing groove 11 to form a seal between the fixing seat 20 and the explosion-proof valve body 10.

[0108] By disposing a main body sealing ring 30 between the explosion-proof valve body 10 and the fixed seat 20, and by using the main body sealing ring 30 to form a seal between the explosion-proof valve body 10 and the fixed seat 20, compared to the O-ring 200, when squeezed, the blank space between the lips of the main body sealing ring 30 is filled, reducing the gap between the sealing groove 11 and the fixed seat 20. Due to the blank buffer space between the lips of the main body sealing ring 30, the main body sealing ring 30 can be compressed more than the O-ring 200 under the same load value, thereby enhancing the sealing effect of the explosion-proof valve 100. That is, even at low valve opening pressures, the main body sealing ring 30 can still compress sufficiently to ensure the sealing effect of the explosion-proof valve 100, reducing the risk of insulation failure in the battery pack. In addition, a lubrication cavity is formed between the sealing lips of the main body sealing ring 30, which has low friction and starting resistance. The non-circular cross-section prevents rolling during reciprocating motion, and has good wear resistance, thereby increasing the service life of the main body sealing ring 30.

[0109] In addition, an embodiment of the present application further provides a battery pack, comprising a battery and a shell, wherein the battery is disposed in the shell, and the shell is provided with the above-mentioned explosion-proof valve.

[0110] The present application also provides an electric device, comprising an electric device and the above-mentioned battery pack. The battery pack is used to provide power to the electric device.

[0111] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical device may be the vehicle's drive mechanism or the vehicle's control system.

[0112] In addition, the electrical equipment may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., among which the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0113] Since the electric device in this embodiment includes the battery pack described in any of the above embodiments, the electric device includes the battery pack structure and beneficial effects, and this embodiment will not be further described here.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion-proof valve, characterized in that: include: An explosion-proof valve body (10), the explosion-proof valve body (10) having a through-opening (14), a sealing groove (11) being provided on the explosion-proof valve body (10), and the sealing groove (11) being arranged around the through-opening (14); A main body sealing ring (30), the main body sealing ring (30) is arranged in the sealing groove (11), and the main body sealing ring (30) has at least one lip; A fixing seat (20) is provided on the explosion-proof valve body (10) and covers the through-hole (14) to press against the body sealing ring (30) provided in the sealing groove (11) to form a seal between the fixing seat (20) and the explosion-proof valve body (10).

2. The explosion-proof valve according to claim 1, characterized in that: The main body sealing ring (30) is in the shape of a ring and is arranged around the center line of the through opening (14).

3. The explosion-proof valve according to claim 1, characterized in that: Along the cross section passing through the center line of the through opening (14), the cross section of the main body sealing ring (30) has a first lip (31), a second lip (32), a third lip (33) and a fourth lip (34), wherein the first lip (31) and the second lip (32) are located on the side of the main body sealing ring (30) close to the center line of the through opening (14), and the third lip (33) and the fourth lip (34) are located on the side of the main body sealing ring (30) away from the center line of the through opening (14).

4. The explosion-proof valve according to claim 3, characterized in that: Along the cross section of the center line passing through the through opening (14), the cross-sectional radius of the first lip (31), the second lip (32), the third lip (33) and the fourth lip (34) of the main body sealing ring (30) is r1, and r1 satisfies: 0.22mm≤r1≤0.30mm.

5. The explosion-proof valve according to claim 3, characterized in that: The cross-sectional diameter of the main body sealing ring (30) along the center line passing through the through-hole (14) is W, and W satisfies: 1.78 mm ≤ W ≤ 2.62 mm; and / or, The inner diameter of the main body sealing ring (30) is d1, and d1 satisfies: 34.0 mm ≤ d1 ≤ 40.0 mm; and / or, The filling rate of the main body sealing ring (30) in the sealing groove (11) is a, and a satisfies: 80%≤a≤95%; and / or, The width of the sealing groove (11) is b1, and b1 satisfies: 1.70 mm ≤ b1 ≤ 2.25 mm; and / or, The depth of the sealing groove (11) is h1, and h1 satisfies: 1.40 mm ≤ h1 ≤ 2.25 mm.

6. The explosion-proof valve according to claim 3, characterized in that: An anti-slip rib (12) is provided in the sealing groove (11), and the anti-slip rib (12) is provided on the side wall of the sealing groove (11) and adjacent to the opening of the sealing groove (11); When the main body sealing ring (30) is arranged in the sealing groove (11), the first lip (31) and the second lip (32) are located on both sides of the anti-slip rib (12) on the side wall of the sealing groove (11) close to the center line of the through opening (14); and / or The third lip (33) and the fourth lip (34) are located on both sides of the anti-slip rib (12) on the side wall of the sealing groove (11) away from the center line of the through opening (14).

7. The explosion-proof valve according to claim 1, characterized in that: The main body sealing ring (30) is made of water-absorbing and swelling rubber.

8. The explosion-proof valve according to claim 1, characterized in that: The main body sealing ring (30) is a two-lip sealing ring or a three-lip sealing ring.

9. The explosion-proof valve according to any one of claims 1 to 8, characterized in that: The explosion-proof valve (100) further comprises an elastic member (40) and a guide shaft (21), wherein the guide shaft (21) is passed through the explosion-proof valve body (10), the fixing seat (20) is connected to the guide shaft (21), the elastic member (40) is sleeved on the guide shaft (21), and is located on a side of the explosion-proof valve body (10) away from the fixing seat (20), one end of the elastic member (40) abuts against the explosion-proof valve body (10), and the other end abuts against an end of the guide shaft (21) away from the explosion-proof valve body (10).

10. The explosion-proof valve according to any one of claims 1 to 8, characterized in that: The explosion-proof valve (100) further comprises a pressure cover (50), which is arranged on a side of the fixing seat (20) away from the explosion-proof valve body (10) and is connected to the fixing seat (20).

11. The explosion-proof valve according to any one of claims 1 to 8, characterized in that: The explosion-proof valve (100) further comprises a liquid-proof breathable membrane (60), the fixing seat (20) is provided with a breathable hole (22), and the liquid-proof breathable membrane (60) is arranged on one side of the fixing seat (20) and covers the breathable hole (22).

12. The explosion-proof valve according to any one of claims 1 to 8, characterized in that: The explosion-proof valve (100) further comprises an outer sealing ring (70), the explosion-proof valve body (10) is provided with a groove (13), the groove (13) is provided on a side of the explosion-proof valve body (10) away from the fixing seat (20), and the outer sealing ring (70) is provided in the groove (13).

13. A battery pack, characterized in that: The invention comprises a battery and a shell, wherein the battery is arranged in the shell, and the shell is provided with an explosion-proof valve (100) according to any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 13.

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