Breathing anti-explosion stop valve and battery pack

Abstract

The utility model discloses a breathing anti-explosion stop valve and a battery pack. The breathing anti-explosion stop valve comprises a valve body, a valve cover, an insert, a sealing ring, an elastic element, a movable ring and a breathing breathable film, the valve cover comprises a cover body and a valve rod formed on the cover body, an air hole is formed in the cover body, and a breathing breathable film is arranged at the end of the cover body; an insert is embedded in the cover body; the movable ring is arranged on the valve rod, the elastic element is arranged in the valve rod containing hole of the valve body, one end of the elastic element abuts against the bottom of the valve rod containing hole, and the other end of the elastic element abuts against the movable ring. The breathing explosion-proof stop valve provided by the utility model is simple in overall structure, the overall breathing explosion-proof stop valve has very high assembly convenience due to the innovative design of the movable clamping ring in the breathing explosion-proof stop valve, and meanwhile, normal valve opening pressure relief and explosion pressure relief functions and a directional explosion stop function are also ensured.

Description

Technical Field

[0001] This utility model relates to explosion-proof valve technology, specifically to a breathing explosion-proof valve technology applied to power battery packs or energy storage battery packs. Background Technology

[0002] The explosion-proof valves used in existing power battery packs or energy storage battery packs have a variety of mature structures, such as metal breathing explosion-proof valves, plastic needle-punch breathing explosion-proof valves, and plastic diaphragm breathing explosion-proof valves.

[0003] Among them, the metal breathing explosion-proof valve breathes through a waterproof and breathable membrane when the pressure difference between the inside of the battery pack and the external environment is small, and releases pressure quickly through a top-opening spring when the pressure difference is large.

[0004] The plastic needle-puncture breathable explosion-proof valve allows the battery pack to breathe through a waterproof and breathable membrane when the pressure difference between the internal pressure and the external environment is small. When the pressure difference is large, the breathable membrane is punctured by the needle, achieving rapid pressure relief, but it cannot be reused.

[0005] The plastic diaphragm-type explosion-proof valve allows the battery pack to breathe through a waterproof and breathable membrane when the pressure difference between the internal pressure and the external environment is small. When the pressure difference is large, the specially designed rubber diaphragm inside deforms under pressure to quickly release pressure. Once the internal and external pressure difference decreases to a certain value, the diaphragm returns to its original shape and maintains a sealed state.

[0006] However, all three types of explosion-proof breathing valves have corresponding shortcomings in practical applications, as follows:

[0007] Metal-based explosion-proof plastic breathing valve: The main body is made of CNC-machined aluminum. Internally, complex connection processes (riveting, gluing, welding, etc.) are used to assemble the various sub-components, enabling the whole valve to isolate water vapor, balance internal and external pressure, and relieve pressure and burst when there is a large pressure difference. Simultaneously, the embedded metal components effectively support the battery pack's final inspection. However, due to material limitations and manufacturing precision requirements, the CNC machining, riveting, gluing, and laser welding processes employed are highly complex, resulting in high manufacturing costs and significant man-hour and logistical costs.

[0008] Plastic needle-punched breather explosion-proof valve: The main body is made of plastic injection molding. After assembling the internal sub-parts, the whole valve has functions such as isolating water vapor, balancing internal and external pressure, and relieving pressure and bursting when the internal and external pressure difference is large. However, because the bursting function is achieved by the irreversible method of directional needle-punched breathable membrane, the requirements for product processing precision and applicable working conditions are high. In addition, due to the special nature of the structure, it cannot support the offline testing function of the entire battery pack.

[0009] Plastic diaphragm type explosion-proof valve: The body is made of plastic injection molding, and the inside is equipped with a special one-way rubber diaphragm and a waterproof and breathable diaphragm. The whole valve also has the functions of isolating water vapor, balancing internal and external pressure, and relieving pressure and bursting when the internal and external pressure difference is large. However, due to the special properties of rubber materials, the requirements for product processing precision and applicable working conditions (high, low temperature and humidity conditions) are relatively high. In addition, due to the properties of the material, it cannot support the offline testing function of the entire battery pack. Utility Model Content

[0010] In view of the problems existing in the breathing explosion-proof valves used in existing power battery packs or energy storage battery packs, the purpose of this utility model is to provide a breathing explosion-proof shut-off valve and a power battery pack or energy storage battery pack using the shut-off valve. The breathing explosion-proof shut-off valve is suitable for power battery packs or energy storage battery packs, has a simple structure, is easy to assemble, and can also realize the offline testing function of the entire battery pack.

[0011] To achieve the above objectives, the present invention provides a breathing explosion-proof shut-off valve, comprising a valve body, a valve cover, an insert, a sealing ring, an elastic element, a movable ring, and a breathing membrane.

[0012] The valve body comprises a large end and a small end. The end face of the large end has a mounting groove, and the bottom of the mounting groove has a valve stem mounting hole that penetrates the valve body and several air passages. A first sealing ring is also provided at the bottom of the mounting groove. Several locking teeth are provided on the outer side of the small end. The locking teeth cooperate with the stepped surface formed on the large end relative to the small end to form a locking structure. A second sealing ring is provided on the stepped surface. The second sealing ring can abut against the component locked by the locking structure to form a sealing structure.

[0013] The valve cover includes a cover body and a valve stem formed on the cover body. The cover body has vent holes that communicate with several air passages in the valve body when the valve cover is installed in the valve body. The valve stem can be movably inserted into a valve stem mounting hole in the valve body, and the cover body is adapted to a mounting groove on the valve body. A breathable membrane is provided on the end face of the valve stem on the cover body, and the breathable membrane can cover the vent holes on the cover body. An insert is embedded in the cover body.

[0014] The movable ring is mounted on the valve stem and is movably placed in the valve stem mounting hole of the valve body. It can move with the valve stem in the valve stem mounting hole. A stop position is formed between the movable ring and the valve stem mounting hole. When the movable ring moves to the stop position, a stop structure is formed between it and the valve stem mounting hole.

[0015] The elastic element is placed in the valve stem mounting hole of the valve body, with one end abutting the bottom of the valve stem mounting hole and the other end abutting the movable ring. The elastic element is configured to drive the entire cover in the valve cover to be placed in the mounting groove and abut against the first sealing ring to form a sealing structure, forming the normal state. The cover can move away from the mounting groove under the thrust of the internal air pressure and disengage from the first sealing ring, releasing the sealing structure and changing from the normal state to the valve opening and pressure relief state. In the valve opening and pressure relief state, the cover can continue to move away from the mounting groove under the thrust of the internal air pressure, causing the movable ring to move to the stop position, changing from the valve opening and pressure relief state to the return to the stop position.

[0016] In some embodiments of this utility model, a plurality of air passages in the valve body are distributed circumferentially along the valve stem mounting hole.

[0017] In some embodiments of this utility model, a guide groove is provided on the side wall of the valve stem mounting hole.

[0018] In some embodiments of this utility model, the cover body is provided with an insert placement groove, and the insert placement groove is provided with a corresponding cover plate.

[0019] In some embodiments of this utility model, the elastic element is a spring.

[0020] In some embodiments of this utility model, the retaining teeth on the valve body include an elastic deformation portion formed on the small end and a retaining tooth portion formed at the end of the elastic deformation portion.

[0021] In some embodiments of this utility model, the movable ring is mounted on the valve stem via a snap-fit ​​structure.

[0022] In some embodiments of this utility model, the movable ring includes a ring body, in which a connecting hole adapted to the valve stem is provided; a plurality of guide blocks and a plurality of elastic locking blocks are provided on the side of the ring body.

[0023] To achieve the above objectives, this utility model also provides a power battery pack or energy storage battery pack, wherein the aforementioned breathing explosion-proof shut-off valve is provided on the shell of the power battery pack or energy storage battery pack.

[0024] The breathing explosion-proof shut-off valve provided by this utility model has a simple overall structure and an innovative internal movable snap-fit ​​ring design, which makes it highly convenient to assemble. At the same time, it also ensures normal valve opening and pressure relief, explosion pressure relief and directional explosion shut-off functions.

[0025] The main components of the breathing explosion-proof shut-off valve provided by this utility model can be processed by plastic injection molding, which has the characteristics of simple structure and low manufacturing cost.

[0026] The breathing explosion-proof shut-off valve provided by this utility model realizes the offline detection function of the entire battery pack by embedding a metal part; furthermore, the embedded metal part is realized by injection molding, thereby reducing the overall assembly process cost and time. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is an example diagram of the explosion-proof shut-off valve for breathing in this utility model;

[0029] Figure 2 This is a cross-sectional view of the breathing explosion-proof shut-off valve in this utility model;

[0030] Figure 3 This is a structural example diagram of the valve body in this utility model;

[0031] Figure 4 This is a structural example diagram of the valve cover in this utility model;

[0032] Figure 5 This is a structural example diagram of the sealing ring in this utility model;

[0033] Figure 6 This is a structural example diagram of the movable ring in this utility model;

[0034] Figure 7 This is a structural example diagram of the elastic element in this utility model;

[0035] Figure 8 This is a structural example diagram of the breathable membrane in this utility model;

[0036] Figure 9 This is a cross-sectional view of the movable ring and the valve body in the cut-off fit of this utility model;

[0037] Figure 10 This is an example diagram of the breathing explosion-proof shut-off valve in its initial normal state in this utility model;

[0038] Figure 11 This is an example diagram of the breathing explosion-proof shut-off valve in the working state position in this utility model;

[0039] Figure 12 This is an example diagram of the breathing explosion-proof shut-off valve in the shut-off position in this utility model. Detailed Implementation

[0040] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.

[0041] See Figure 1and Figure 2 The diagram shows an example of the configuration of the breathing explosion-proof shut-off valve provided by this utility model.

[0042] Based on the illustration, the breathing explosion-proof shut-off valve 100 provided in this example solution mainly includes seven components in its structure: valve body 110, valve cover 120, insert 130, sealing ring 140, elastic element 150, moving ring 160, and breathing membrane 170.

[0043] The valve body 110 constitutes the main structure of the entire breathing explosion-proof shut-off valve and is used to support other components.

[0044] Further integration Figure 3 As shown, the valve body 110 has a circular stepped structure with a "T"-shaped cross-section, specifically including a large end 111 and a small end 112 formed on the large end 111. The large end 111 and the small end 112 are both cylindrical, and the small end 112 is coaxially formed in the middle of the large end 111. An annular stepped surface 113 is formed between the small end 112 and the large end 111.

[0045] In the valve body 110 thus formed, the small end 112 serves as an insertion portion, used to extend into the component to be connected (such as a power battery pack or energy storage battery pack) 200, while the large end 111 serves as an abutment portion, abutting against the corresponding part on the outside of the component to be connected 200 based on the formed annular stepped surface 113, thus limiting the insertion stroke of the small end 112 (e.g., Figure 9 (As shown).

[0046] Based on this, the present solution further provides a plurality of locking teeth 114 on the outer side of the small end 112. The locking teeth 114 are distributed circumferentially along the small end 112 and are arranged to face the stepped surface 113 on the large end 111, and can engage with the stepped surface 113 on the large end 111 to form a locking structure. This locking structure is configured to lock the component that abuts against the stepped surface 113 on the large end 111. Thus, based on this locking structure, when the small end 112 is inserted into the component to be connected (such as a power battery pack or energy storage battery pack) 200, it locks the part of the component to be connected (such as a power battery pack or energy storage battery pack) that abuts against the stepped surface 113 on the large end 111, thereby locking and fixing the entire valve body 110 onto the component to be connected (such as a power battery pack or energy storage battery pack) 200.

[0047] Furthermore, this solution also provides a second sealing ring 141 on the stepped surface 113 of the large end 111. The second sealing ring 141 is distributed along the annular stepped surface 113 and can directly abut against the component and form a sealing structure when the clamping structure clamps the component that abuts against the stepped surface 113 of the large end 111. Thus, when the small end 112 is inserted into the component to be connected (such as a power battery pack or an energy storage battery pack) 200, the clamping structure clamps the component to be connected (such as a power battery pack or an energy storage battery pack). When the valve body 110 abuts against the stepped surface 113 on the large end 111, the second sealing ring 141 on the stepped surface 113 abuts against the outer side of the corresponding part of the component to be connected (such as a power battery pack or energy storage battery pack) 200 to form a sealing structure. That is, a seal is formed between the valve body 110 and the component to be connected (such as a power battery pack or energy storage battery pack) 200, so that the entire valve body 110 is sealed and locked onto the component to be connected (such as a power battery pack or energy storage battery pack) 200.

[0048] Furthermore, this solution also provides a mounting groove 115 on the end face of the large end 111. The bottom of the mounting groove 115 is provided with a valve stem mounting hole 116 that penetrates the valve body. The mounting groove 115 and the valve stem mounting hole 116 are configured to fit the valve cover 120, allowing the valve cover 120 to be movably mounted therein.

[0049] Based on this, the solution further provides several air passages 117 penetrating the valve body at the bottom of the mounting groove 115, which are used to cooperate with the valve cover 120 to realize the exhaust function.

[0050] To improve exhaust stability, several air passages 117 are distributed circumferentially along the valve stem mounting hole 116, preferably in a circular pattern with the valve stem mounting hole 116 as the center, but are not limited thereto.

[0051] This solution also provides a first sealing ring 142 at the bottom of the mounting groove 115. The first sealing ring 142 is distributed on the outside of several air passages 117 (i.e., on the side away from the valve stem mounting hole 116). It can cooperate with the valve cover 120 installed in the mounting groove 115 to form a sealing structure on the outside of several air passages 117, which is used to isolate the communication between the inner air passages 117 and the outside world, thereby realizing the function of closing the exhaust.

[0052] In this design, the valve cover 120 is fitted with the mounting groove 115 on the valve body 110 and the valve stem mounting hole 116, and is movably mounted in the valve body 110. This allows the movement of the valve cover 120 in the valve body 110 to be linked with the exhaust state of the valve body. In other words, the exhaust state of the valve body can be adjusted according to the movement of the valve cover 120 in the valve body 110 to maintain the pressure balance inside and outside the valve body.

[0053] See Figure 4In this design, the valve cover 120 specifically includes two parts: a cover body 121 and a valve stem 122 formed on the cover body. The cover body 121 is configured to fit into the mounting groove 115 on the valve body 110, while the valve stem 122 is configured to fit into the valve stem mounting hole 116 on the valve body 110, and can be movably inserted into the valve stem mounting hole 116 on the valve body.

[0054] Based on this, at least one vent hole 124 is provided on the cover 121. The vent hole 124 can communicate with several air passages 117 in the valve body 110 when the valve cover 120 is placed in the valve body 110, forming a venting channel that passes through the valve cover and the cover.

[0055] Furthermore, this solution provides a breathable membrane 170 on the end face of the valve stem 122 on the cover 121. The breathable membrane 170 covers the port portions of all the vent holes 124 on the end face of the valve stem 122 on the cover 121, thereby achieving the configuration for controlling the ventilation of the internal air passages of the valve cover 120.

[0056] This solution embeds an insert 130 inside the cover 121 of the valve cover 120 to enable the entire breathing explosion-proof shut-off valve to support magnetic suction offline detection fixtures.

[0057] The valve cover 120 thus formed can be movably inserted into the valve stem mounting hole 116 on the valve body 110 via the valve stem 122 thereon, thereby enabling the cover body 121 to be mounted in the mounting groove 115 on the valve body 110.

[0058] In this design, the movable ring 160 is located at the end of the valve stem 122, which is installed on the valve cover 120 in the valve body 110, and is movably placed in the valve stem mounting hole 116 of the valve body, so that it can move synchronously with the valve stem 122 in the valve stem mounting hole 116.

[0059] The movable ring 160 is also configured with a stop position between itself and the valve stem mounting hole 116. When the movable ring 160 moves along the valve stem mounting hole to the stop position, a stop structure is formed between the movable ring 160 and the valve stem mounting hole 116, thereby achieving a quantitative stop of the valve stem 122 relative to the valve stem mounting hole 116, so that the valve stem 122 is fixed in the stop position and cannot be reset in the valve stem mounting hole 116.

[0060] The movable ring 160 is also provided with a guide structure between itself and the valve stem mounting hole, which limits the movement of the movable ring 160 in the valve stem mounting hole 116, so that the movable ring 160 can only slide directionally in the valve stem mounting hole 116 (e.g., it can only slide axially and cannot rotate circumferentially).

[0061] In this design, the elastic element 150 is placed in the valve stem mounting hole 116 of the valve body 110, with one end abutting the bottom of the valve stem mounting hole 116 and the other end abutting the movable ring 160, so as to provide a stable valve opening force.

[0062] Meanwhile, the elastic element 150 is further configured to drive the cover 121 in the valve cover 120 to be placed in the mounting groove 115 and abut against the first sealing ring 142 to form a sealing structure, thereby constituting the normal state of the entire shut-off valve. Based on this, the cover 121 in the valve cover 120 can move away from the mounting groove 115 under the thrust of the internal air pressure and disengage from the first sealing ring 142, releasing the sealing structure, so that the entire shut-off valve changes from the normal state to the open valve depressurization state. During this process, the valve cover 120 will synchronously drive the movable ring 160 to move towards the shut-off position in the valve stem mounting hole 116. Furthermore, in the open valve depressurization state, the cover 121 in the valve cover 120 can continue to move away from the mounting groove 115 under the thrust of the internal air pressure, and synchronously drive the movable ring 160 to move to the shut-off position in the valve stem mounting hole 116. At this time, a shut-off structure is formed between the movable ring 160 and the valve stem mounting hole 116, thereby realizing the quantitative locking of the valve stem 122 relative to the valve stem mounting hole 116, so that the valve stem 122 is fixed in the shut-off position and cannot be reset in the valve stem mounting hole 116, thus making the entire shut-off valve change from the open valve depressurization state to the return shut-off state and maintain the shut-off state.

[0063] The following provides a detailed description of the structure and technical features of the breathing explosion-proof shut-off valve 100 provided in the example scheme of this utility model.

[0064] See Figure 2 and Figure 3 In the valve body 110 of the breathing explosion-proof shut-off valve 100, during the molding process, the retaining teeth 114 provided on the outer side of the small end 112 are preferably formed by the elastic deformation part 114a extending from the outer side of the small end 112 toward the stepped surface 113 and the retaining tooth part 114b formed on the top of the elastic deformation part; the retaining tooth part 114b has a stepped retaining structure as a whole.

[0065] The resulting locking teeth 114 can engage with the component to be connected (such as a power battery pack or energy storage battery pack) 200 based on the stepped locking portion 114b at the top, and at the same time generate elastic force based on the elastic deformation portion 114a to cooperate with the stepped surface 113 on the large end 111 of the valve body to lock the component to be connected (such as a power battery pack or energy storage battery pack) 200.

[0066] Meanwhile, regarding the number of locking teeth 114 provided on the outer side of the small end 112, it is preferable that four groups are symmetrically distributed on the outer side of the small end 112.

[0067] Furthermore, the valve stem mounting holes 116 in the valve body 110 are preferably distributed along the central axis of the valve body 110.

[0068] Furthermore, the air passage 117 in the valve body 110 is preferably fan-shaped and distributed in a circular form around the valve stem mounting hole 116 with the valve stem mounting hole 116 as the center.

[0069] Specifically, the air passage wall 117a between adjacent air passages 117 in the valve body 110 is a slope that gradually decreases in height from the outer end to the inner end, thereby ensuring the reliability of the air passage 117 in the valve body 110 and the air vent 124 on the valve cover 120 when the valve cover 120 is placed in the valve body 110.

[0070] For valve body 110 with such structure, the whole is made of plastic injection molding, which can ensure the reliability of the structure and improve the efficiency of operation.

[0071] See Figure 4 In this breathing explosion-proof shut-off valve 100, a number of vent holes 124 on the cover 121 of the valve cover 120 are distributed circumferentially along the center of the cover 121, preferably in a ring shape, so as to facilitate the formation of a matching structure with the breathing breathable membrane 170.

[0072] Furthermore, an annular groove 123 is formed on the top side of the valve stem 122 in the valve cover 120 for engaging with the movable ring 160. Simultaneously, the annular groove 123 is also configured to fit into the valve stem mounting hole 116, allowing the valve stem 122 to be inserted into the valve stem mounting hole 116.

[0073] For valve cover 120 with such structure, the whole piece is made of plastic injection molding. This can ensure the reliability of the structure and improve the efficiency of operation.

[0074] Based on this, during the injection molding of the valve cover 120, the insert 130 can be simultaneously molded into the cover body 121.

[0075] See Figure 5 The sealing ring 140 in this explosion-proof breathing valve 100 is made entirely of rubber / vulcanized molding.

[0076] As a further explanation, in this solution, it is preferable to form a number of limiting ribs on the outer side of the sealing ring 140 body, which are used to limit the structure of the sealing ring 140 when it is placed on the valve body 110, so as to ensure that the sealing ring 140 is stably and reliably placed in the valve body 110, thereby improving the reliability of the sealing structure.

[0077] As a further explanation, in this solution, the sealing ring 141 is preferably made of an annular sealing ring body, and an annular sealing part is formed by extending inward synchronously on the inner side of the sealing ring body, thereby improving the reliability of the sealing structure formed when the valve body 110 is installed.

[0078] See Figure 6 The movable ring 160 in this breathing explosion-proof shut-off valve 100 has an overall ring structure, which includes a ring body 161. The ring body 161 has a connection hole 162 adapted to the valve stem. The side of the ring body 161 is provided with a number of shut-off claws 164.

[0079] Furthermore, the connecting hole 162 formed in the ring body 161 has an annular stepped portion 165 on the hole wall, and a plurality of elastic locking teeth 163 are also provided on the hole wall of the connecting hole 162. These elastic locking teeth 163 are distributed circumferentially along the hole wall of the connecting hole 162 and can be adapted to the annular locking groove 123 on the valve stem 122 to form a locking structure, so that the movable ring 160 is connected to the valve stem 122.

[0080] As a further explanation, the annular step portion 165 provided on the inner wall of the connecting hole 162 in the ring body 161 has a through hole 166 formed in the middle of the annular step portion 165. The diameter of the through hole 166 is adapted to the body of the valve stem 122 so that the valve stem 122 can be movably inserted therein.

[0081] With this structure, when the valve cover 120 is connected to the movable ring 160 via the valve stem 122, the top end of the valve stem 122, which has an annular groove 123, is directly inserted into the movable ring 160 through the through hole 166 in the middle of the annular step portion 165 inside the movable ring 160. During the insertion process, the annular groove 123 at the top end of the valve stem 122 will open up several elastic teeth 163 on the inner wall of the movable ring 160. After the annular groove 123 at the top end of the valve stem 122 passes through several elastic teeth 163 on the inner wall of the movable ring 160, the annular groove 123 will abut against several elastic teeth 163 to form a snap-fit ​​structure, thereby realizing the snap-fit ​​between the valve stem 122 and the movable ring 160.

[0082] As a further explanation, the annular step portion 165 provided in the ring body 161 also serves as an elastic element placement portion, used to accommodate the corresponding elastic element 150.

[0083] To ensure the reliability of the fit with the elastic element 150, this example provides several limiting protrusions 167 circumferentially along the central through hole 166 on the annular step portion 165.

[0084] Furthermore, each guide block 163 provided on the side of the ring 161 is configured to be adapted to the guide groove 116a on the side wall of the valve stem mounting hole 116 to form a guide structure for limiting the movable direction of the movable ring 160 in the valve stem mounting hole 116.

[0085] Specifically, each guide block 163 on the side of the ring 161 extends circumferentially and is distributed on the side of the ring 161. The guide blocks 163 are distributed circumferentially with respect to the guide grooves 116a on the side wall of the valve stem mounting hole 116. This restricts the movable ring 160 to move only along the axial direction of the valve stem mounting hole 116 in the valve stem mounting hole 116, thus achieving directional movement or directional sliding.

[0086] Furthermore, the stop claw 164 provided on the side of the ring 161 is used to cooperate with the valve stem mounting hole 116 to form a stop structure between the movable ring moving 160 and the valve stem mounting hole 116.

[0087] Specifically, each stop claw 164 is composed of an elastic support arm 164a and a claw portion 164b disposed on the elastic support arm 164a. As an example, the elastic support arm 164a is cut from the side wall of the ring 161 and can generate a certain elastic deformation facing the inside of the ring 161 under the action of external force, and can recover based on elastic force when the external force is removed; while the claw portion 164b is directly formed on the bottom end of the elastic support arm 164a and can move facing the inside of the ring 161 with the elastic deformation of the elastic support arm 164a.

[0088] Preferably, a number of stop claws 164 are evenly distributed on the side of the ring body 161 along the circumference of the ring body 161.

[0089] To accommodate the ring 161 in the above structure, a plurality of stop-limiting blocks 116b are provided on the inner wall of the valve stem mounting hole 116, corresponding to the plurality of stop-limiting claws 164 on the ring 161, such as... Figure 9 As shown. The stop limit block 116b here is configured to cooperate with several stop claws 164 on the ring body 161 to form a stop structure, thereby limiting the movement of the movable ring 160 in the valve stem mounting hole 116, so that the movable ring 160 cannot be reset in the valve stem mounting hole 116.

[0090] Specifically, a number of stop-limiting blocks 116b are distributed circumferentially on the inner wall of the valve stem mounting hole 116, and their distribution orientation corresponds to a number of stop-limiting claws 164 on the ring body 161. That is, when the ring body 161 is movably mounted in the valve stem mounting hole 116 via the guide block 163 thereon, the number of stop-limiting blocks 116b on the inner wall of the valve stem mounting hole 116 corresponds exactly to a number of stop-limiting claws 164 on the outer surface of the ring body 161 in the axial direction. In other words, each stop-limiting block 116b is exactly located on the stroke of each stop-limiting claw 164 as the ring body 161 moves axially in the valve stem mounting hole 116.

[0091] Furthermore, each stop limit block 116b is also configured to form an axial abutment limit with the corresponding stop claw 164 on the ring body 161.

[0092] Accordingly, the position where the stop limit block 116b is set inside the valve stem mounting hole 116 is designated as the stop position. Thus, when the movable ring 160 is movably positioned in the valve stem mounting hole 116 via the guide block 163, its several stop claws 164 correspond and engage with the several stop limit blocks 116b on the inner wall of the valve stem mounting hole 116. When the movable ring 160 is subjected to force and moves along the valve stem mounting hole 116 towards the stop position, it can simultaneously drive its stop claws 164 to move towards the stop limit blocks 116b on the inner wall of the valve stem mounting hole 116. After moving a certain distance, the stop claws 164 on the movable ring 160... The stop claw 164 will abut against the corresponding stop limiting block 116b on the inner wall of the valve stem mounting hole 116. The stop limiting block 116b provides a certain axial limit to the corresponding stop claw 164, preventing the stop claw 164 from moving further along the axial direction. In this state, if the movable ring 160 is further subjected to force, it will cause the stop claw 164 on it to continue to move along the axial direction of the valve stem mounting hole 116. At that time, under the limiting action of the corresponding stop limiting block 116b, the stop claw 164 will undergo inward compressive deformation. Until the axial engagement with the corresponding stop block 116b is disengaged, the stop block 116b will lose its axial restraint on the deformed stop pawl 164, while simultaneously providing radial restraint. After losing the axial restraint of the stop block 116b, the deformed stop pawl 164 will be able to continue moving axially until it passes the stop block 116b and loses its radial restraint, meaning the stop pawl 164 moves from one side of the stop block 116b to the stop limit. On the other side of block 116b; after losing the radial limit of the stop block 116b, the deformed stop claw 164 will synchronously recover and unfold to its original shape under the action of its own elastic restoring force. The stop claw 164, which has recovered to its original shape, will abut against the stop block 116b on the other side, forming a stop structure, thereby realizing the quantitative locking of the valve stem 122 relative to the valve stem mounting hole 116, so that the valve stem 122 is fixed in the stop position and cannot be reset or moved in the valve stem mounting hole 116. Figure 9 As shown.

[0093] For the movable ring 160 with such a structure, the whole is made of plastic injection molding. This can ensure the reliability of the structure and improve the efficiency of operation.

[0094] See Figure 7 In this explosion-proof breathing valve 100, the elastic element 150 is preferably a spring for communication, such as a cylindrical or pagoda type.

[0095] The elastic element 150 of the spring structure is placed in the valve stem mounting hole 116 of the valve body 110 and sleeved on the valve stem 122 of the valve cover 120. One end abuts against the bottom of the valve stem mounting hole 116, and the other end is engaged with the annular step portion 165 in the movable ring 160. At the same time, when the valve cover 120 is placed in the valve body 110 by cooperating with the movable ring 160, the elastic element 150 of the spring structure is in a pre-compressed state. In this way, the elastic element 150 of the spring structure will generate a spring force on the movable ring 160 facing the port of the valve stem mounting hole 116, thereby driving the movable ring 160 to move towards the port of the valve stem mounting hole 116, and then driving the valve stem 122 to move the cover 121 to be placed in the mounting groove 115 and abut against the first sealing ring 142 to form a sealing structure, thus constituting the normal state of the entire shut-off valve.

[0096] See Figure 8 The breathable membrane 170 in this explosion-proof breathing valve 100 is preferably made of e-PTFE by compression molding, and has the functions of breathability and waterproofing.

[0097] The insert 130 in this explosion-proof breathing valve 100 is preferably made of magnetically adsorbable metal, which enables the battery pack to be inspected after assembly, while also reducing the overall assembly process cost and time.

[0098] Combination Figure 1 and Figure 2 As shown, in the specific implementation of such a breathing explosion-proof shut-off valve, according to the above structural scheme, the valve body 110, valve cover 120, and movable ring 160 are formed by plastic injection molding; at the same time, the insert 130 is simultaneously injection molded into the valve cover 120 during the injection molding of the valve cover 120.

[0099] At that time, a corresponding sealing ring 140 will be installed on the valve body 110, and an elastic element 150 will be placed in the valve stem mounting hole 116 on the valve body 110; and a corresponding breathing membrane 170 will be installed on the valve cover 120.

[0100] Next, the valve cover 120 is inserted from the large end of the valve body 110 into the valve stem mounting hole 116 on the valve body 110.

[0101] Finally, from the small end of the valve body 110, the movable ring 160 is placed in the valve stem mounting hole 116 on the valve body 110, and the movable ring 160 is engaged with the valve stem 122 inserted in the valve stem mounting hole 116 on the valve body 110, thereby assembling and forming a breathing explosion-proof shut-off valve.

[0102] The following specific application examples further illustrate the application process of this breathing explosion-proof shut-off valve 100.

[0103] This section uses a power battery pack or energy storage battery pack as an example to illustrate the application and function of this breathing explosion-proof shut-off valve 100.

[0104] First, a breathing explosion-proof shut-off valve 100 is constructed based on the aforementioned scheme. The breathing explosion-proof shut-off valve 100 is then directly engaged with the housing 200 of the power battery pack or energy storage battery pack using the locking teeth 114 on the valve body 110. Simultaneously, the second sealing ring 141 on the valve body 110 cooperates with the housing 200 of the power battery pack or energy storage battery pack to achieve a tight seal between the valve body 110 and the housing 200. Figure 9 As shown.

[0105] See Figure 10 When the internal pressure P = 0 kPa in the power battery pack or energy storage battery pack, the entire breathing explosion-proof shut-off valve 100 is in its initial normal state, in which the moving ring is also in its normal position and is in a stationary state.

[0106] See Figure 11 When the internal pressure inside the power battery pack or energy storage battery pack is 4≤P≤10Kpa, the entire breathing explosion-proof shut-off valve 100 is in the working state. At this time, the valve cover moves upward under the thrust of the internal air pressure. The moving ring moves upward along with the valve cover and moves to the working state position, thereby realizing the valve opening and pressure relief function.

[0107] See Figure 12 When the internal pressure P in the power battery pack or energy storage battery pack is greater than or equal to 10 kPa, the entire breathing explosion-proof shut-off valve 100 is in the shut-off position. At this time, the valve cover moves upward with the movable ring to the limit position, that is, to the shut-off position. The shut-off claw of the movable ring is released to realize the function of shut-off return of the valve cover.

[0108] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A breathing explosion-proof shut-off valve, characterized in that, This includes the valve body, valve cover, inserts, sealing rings, elastic elements, moving rings, and breathable membrane; The valve body comprises a large end and a small end. The end face of the large end has a mounting groove, and the bottom of the mounting groove has a valve stem mounting hole that penetrates the valve body and several air passages. A first sealing ring is also provided at the bottom of the mounting groove. Several locking teeth are provided on the outer side of the small end. The locking teeth cooperate with the stepped surface formed on the large end relative to the small end to form a locking structure. A second sealing ring is provided on the stepped surface. The second sealing ring can abut against the component locked by the locking structure to form a sealing structure. The valve cover includes a cover body and a valve stem formed on the cover body. The cover body has vent holes that communicate with several air passages in the valve body when the valve cover is installed in the valve body. The valve stem can be movably inserted into a valve stem mounting hole in the valve body, and the cover body is adapted to a mounting groove on the valve body. A breathable membrane is provided on the end face of the valve stem on the cover body, and the breathable membrane can cover the vent holes on the cover body. An insert is embedded in the cover body. The movable ring is mounted on the valve stem and is movably placed in the valve stem mounting hole of the valve body. It can move with the valve stem in the valve stem mounting hole. A stop position is provided between the movable ring and the valve stem mounting hole. When the movable ring moves to the stop position, a stop structure is formed between it and the valve stem mounting hole. The elastic element is placed in the valve stem mounting hole of the valve body, with one end abutting the bottom of the valve stem mounting hole and the other end abutting the movable ring. The elastic element is configured to drive the entire cover in the valve cover to be placed in the mounting groove and abut against the first sealing ring to form a sealing structure, forming the normal state. The cover can move away from the mounting groove under the thrust of the internal air pressure and disengage from the first sealing ring, releasing the sealing structure and changing from the normal state to the valve opening and pressure relief state. In the valve opening and pressure relief state, the cover can continue to move away from the mounting groove under the thrust of the internal air pressure, causing the movable ring to move to the stop position, changing from the valve opening and pressure relief state to the return to the stop position.

2. The breathing explosion-proof shut-off valve according to claim 1, characterized in that, Several air passages in the valve body are distributed circumferentially along the valve stem mounting holes.

3. The breathing explosion-proof shut-off valve according to claim 1, characterized in that, A guide groove is provided on the side wall of the valve stem mounting hole.

4. The breathing explosion-proof shut-off valve according to claim 1, characterized in that, The cover is provided with an insert placement groove, and a corresponding cover plate is disposed on the insert placement groove.

5. The breathing explosion-proof shut-off valve according to claim 1, characterized in that, The elastic element is a spring.

6. The breathing explosion-proof shut-off valve according to claim 1, characterized in that, The retaining teeth on the valve body include an elastic deformation portion formed on the small end and a retaining tooth portion formed at the end of the elastic deformation portion.

7. The breathing explosion-proof shut-off valve according to claim 1, characterized in that, The movable ring is mounted on the valve stem via a snap-fit ​​structure.

8. The breathing explosion-proof shut-off valve according to claim 1, characterized in that, The movable ring includes a ring body with a connection hole adapted to the valve stem; the side of the ring body is provided with a number of guide blocks and a number of elastic locking blocks.

9. A battery pack, characterized in that, The battery pack housing is provided with a breathing explosion-proof shut-off valve as described in any one of claims 1-8.

Images