Explosion-proof valve and power battery system

Abstract

The utility model discloses an anti-explosion valve and a power battery system. The anti-explosion valve comprises a valve body, a sealing piece and a waterproof breathable film, the sealing piece is arranged in the pressure relief channel and abuts against the side wall of the pressure relief channel in a sealing mode, and the sealing piece is provided with an air hole used for ventilation. A limiting mechanism is further arranged between the sealing piece and the valve body, and the limiting mechanism comprises an elastic structure and a fixing structure connected with the elastic structure in an abutting mode. The limiting mechanism is configured to enable the sealing piece to abut against the valve body when the anti-explosion valve is in a normal state. The limiting mechanism is further configured to enable the sealing piece to be separated from the valve body when the anti-explosion valve is in the pressure relief state. According to the anti-explosion valve and the power battery system, the connection stability between the sealing piece and the valve body of the anti-explosion valve in a normal state is improved, and the separation between the sealing piece and the valve body in a pressure relief state is not influenced, so that the anti-explosion valve can obtain more stable and reliable pressure relief and anti-explosion effects.

Description

Technical Field

[0001] This application relates to the field of explosion-proof device technology, and in particular to explosion-proof valves and power battery systems. Background Technology

[0002] When power battery systems are used in harsh environments for extended periods or encounter sudden abnormal accidents, they are prone to explosions, blasts, and other incidents that can cause personal injury and property damage, posing significant safety risks to users.

[0003] To mitigate the aforementioned risks, existing power battery systems typically install one or more explosion-proof valves on the casing housing the battery pack. These valves provide waterproofing, dustproofing, and explosion-proof protection, preventing or reducing the safety impact of accidents. In cases of thermal runaway short circuits within the sealed enclosure of mechanical equipment, leading to a sustained increase in ambient temperature, existing power battery systems generally utilize pin-type or spring-loaded explosion-proof valves to release pressure and prevent explosions. While pin-type or spring-loaded explosion-proof valves achieve pressure relief, their internal structures are complex, resulting in higher manufacturing costs. Furthermore, these types of valves cannot provide a direct, unobstructed pressure relief path, making them unsuitable for rapid and continuous pressure release.

[0004] To simplify the structure of explosion-proof valves, some existing explosion-proof valves directly install a protective cover on the pressure relief channel of the valve body. A connector is placed between the protective cover and the valve body, and this connector is used to tighten the protective cover, ensuring a tight seal between them and achieving a sealing effect. However, this method is generally only applicable to scenarios where air permeability is not required between the internal and external parts of the power battery system, and it cannot achieve waterproof and breathable functionality. However, in certain scenarios, achieving waterproof and breathable functionality in explosion-proof valves is crucial. Therefore, how to achieve waterproof and breathable functionality while ensuring the stability of the connection between the protective cover and the valve body is an urgent problem to be solved. Utility Model Content

[0005] This application discloses an explosion-proof valve and a power battery system, which can achieve waterproof and breathable functions while ensuring the reliability of the explosion-proof valve.

[0006] In a first aspect, this application provides an explosion-proof valve, comprising:

[0007] The valve body has a pressure relief channel in the middle;

[0008] A sealing element, disposed within the pressure relief channel and abutting against the side wall of the pressure relief channel for sealing, the sealing element having vent holes for ventilation; and

[0009] A waterproof and breathable membrane is used to cover the vent holes;

[0010] A limiting mechanism is provided between the sealing element and the valve body. The limiting mechanism includes an elastic structure and a fixed structure that abuts against the elastic structure.

[0011] The limiting mechanism is configured to keep the seal in contact with the valve body when the explosion-proof valve is in a normal state; the limiting mechanism is also configured to allow the seal to detach from the valve body when the explosion-proof valve is in a depressurized state.

[0012] In one embodiment, the limiting mechanism includes:

[0013] Elastic structure; and

[0014] A fixed structure abuts against the elastic structure;

[0015] The elastic structure is disposed on the sealing element, and the fixing structure is disposed on the valve body; when the sealing element and the valve body abut and seal, the elastic structure abuts against the fixing structure on the side closer to the sealing element; or

[0016] The elastic structure is disposed on the valve body, and the fixing structure is disposed on the sealing element; when the sealing element abuts and seals with the valve body, the fixing structure abuts against the elastic structure on the side closer to the sealing element.

[0017] In one embodiment, at least a portion of the elastic structure is disposed transversely at the vent hole;

[0018] One end of the fixed structure is connected to the side wall or seal of the pressure relief channel, and the other end extends to one side of the elastic structure and abuts against the elastic structure.

[0019] In one embodiment, the fixing structure has a positioning part at the contact point with the elastic structure for positioning the elastic structure.

[0020] In one embodiment, the elastic structure includes a rubber ring and a rubber strip connected to the rubber ring; the rubber strip extends across the middle of the rubber ring;

[0021] The rubber ring is sleeved on the outside of the seal or disposed on the side wall of the pressure relief channel, and the seal is sealed by the rubber ring abutting against the side wall of the pressure relief channel.

[0022] The adhesive strip abuts against one side of the fixing structure.

[0023] In one embodiment, the elastic structure further includes:

[0024] A connecting part is fixedly connected to the seal or valve body, and the connecting part is configured such that when the explosion-proof valve is in a depressurized state, the seal remains connected to the valve body through the connecting part.

[0025] In one embodiment, the explosion-proof valve further includes:

[0026] A cover is provided over the pressure relief channel, and a gap for ventilation is provided between the cover and the valve body.

[0027] In one embodiment, the cover is provided with a pressing part, which is located on the side close to the waterproof and breathable membrane, and is used to press and fix the waterproof and breathable membrane.

[0028] In one embodiment, the crimping portion is provided with an opening for ventilation.

[0029] Secondly, this application also provides a power battery system, the power battery system comprising:

[0030] The enclosure containing the power battery; and

[0031] An explosion-proof valve is installed on the enclosure, and the explosion-proof valve is the explosion-proof valve described in any of the above embodiments.

[0032] As described above, the explosion-proof valve and power battery system provided in this application include a valve body, a sealing element, and a waterproof and breathable membrane. The explosion-proof valve also has a limiting mechanism between the sealing element and the valve body. This limiting mechanism includes an elastic structure and a fixed structure that abuts against the elastic structure. Through this limiting mechanism, the explosion-proof valve, under normal conditions, maintains the relative fixation between the sealing element and the valve body through the elastic force of the elastic structure and the abutment between the fixed structure, thereby preventing the sealing element from loosening and affecting the stability of the cover. When the explosion-proof valve has a cover, the relative fixation of the sealing element by the limiting mechanism also reduces the fixing requirements between the cover and the valve body, ensuring good connection stability even with a gap for ventilation. Furthermore, the waterproof and breathable membrane on the sealing element provides waterproof and breathable functionality.

[0033] When the explosion-proof valve is in a depressurized state, the waterproof and breathable membrane on the cover and the seal is impacted by the airflow. The cover and the seal are impacted by the depressurized airflow and move away from the valve body. At this time, the elastic structure is stretched and deformed and eventually breaks or breaks away from the limit of the fixed structure, so that the cover, the seal and the valve body can be smoothly separated.

[0034] Therefore, the explosion-proof valve and power battery system of this application not only improve the connection stability between the seal and the valve body under normal conditions, avoiding accidental opening of the cover due to the seal falling off, but also do not affect the separation between the cover, seal and valve body under pressure relief, thereby enabling the explosion-proof valve to obtain a more stable and reliable pressure relief and explosion-proof effect. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the explosion-proof valve provided in the embodiments of this application from an explosion perspective.

[0036] Figure 2 For this application Figure 1 A schematic diagram of the cross-sectional structure of AA.

[0037] Figure 3 This is a schematic diagram of the sealing element and part of the limiting mechanism provided in the embodiments of this application.

[0038] Figure 4 This is a schematic diagram of the explosion-proof valve provided in an embodiment of this application from another perspective.

[0039] Figure 5 This is a schematic diagram of the explosion-proof valve provided in an embodiment of this application from another explosion perspective.

[0040] Figure 6 This is a schematic diagram illustrating the application scenario of the explosion-proof valve provided in the embodiments of this application.

[0041] Figure 7 This is a schematic diagram of another application scenario for the explosion-proof valve provided in the embodiments of this application.

[0042] Figure 8 Another cross-sectional structural diagram of the explosion-proof valve provided in the embodiments of this application.

[0043] Figure 9 This is a schematic diagram of the architecture of a power battery system provided in an embodiment of this application. Detailed Implementation

[0044] To facilitate understanding of this application, a more comprehensive description will be provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0045] Please refer to Figure 1 , Figure 1 The diagram shows a schematic structural diagram of the explosion-proof valve provided in an embodiment of this application from an explosion perspective.

[0046] like Figure 1As shown, the explosion-proof valve includes a valve body 1, a sealing element 2, a waterproof and breathable membrane 3, and a limiting mechanism 4.

[0047] The valve body 1 has a pressure relief channel 11 in the middle, which is used to discharge gas or sputtering material generated by thermal runaway when the explosion-proof valve is in a pressure relief state. The valve body 1 can be made of rigid materials such as metal or plastic to form the main body of the explosion-proof valve.

[0048] The seal 2 is disposed within the pressure relief channel 11 and abuts against the side wall of the pressure relief channel 11 for sealing. The seal 2 has vent holes for air passage. These vent holes can be used for pressure relief and can also work with the waterproof and breathable membrane 3 to achieve the waterproof and breathable function of the explosion-proof valve. Specifically, the periphery of the seal 2 abuts against the side wall of the pressure relief channel 11, preventing airflow from passing between the seal 2 and the side wall of the pressure relief channel 11. In one embodiment, the seal 2 can achieve a better sealing effect by setting a rubber ring on its periphery or by using an elastic material and employing an interference fit, which can also improve the fixing effect between the seal 2 and the valve body 1. The side wall of the pressure relief channel 11 can be provided with grooves for the seal 2 to engage, thereby improving the fixing effect of the seal 2.

[0049] To achieve waterproof and breathable functionality, a waterproof and breathable membrane 3 is covered at the vent. This membrane 3 can be made of e-PTFE (expanded polytetrafluoroethylene), thus giving the explosion-proof valve a certain degree of waterproof and breathable properties. Specifically, the waterproof and breathable membrane 3 can abut against the sealing element 2 or the valve body 1, and can also be fixed to the sealing element 2 or the valve body 1 by heat fusion, setting a pressure ring 31, etc. Figure 1 The waterproof and breathable membrane 3 is pressed between the pressure ring 31 and the sealing element 2 by the pressure ring 31. It is understood that the fixing method of the waterproof and breathable membrane 3 is not limited to the above method, as long as it can cover the vent holes of the sealing element 2 to achieve the waterproof and breathable function. This application does not limit it in this regard.

[0050] Combination Figure 2 The figure shows the present application. Figure 1 A cross-sectional view of the structure of AA is shown. A limiting mechanism 4 is provided between the sealing element 2 and the valve body 1. This limiting mechanism 4 includes an elastic structure 41 and a fixing structure 42 that abuts against the elastic structure 41. The fixing structure 42 can be located on either the sealing element 2 or the valve body 1, and the elastic structure 41 can also be located on either the sealing element 2 or the valve body 1; their positional relationship depends on their relative positions.

[0051] For example, when the explosion-proof valve is in its normal state, the elastic structure 41 can be located on the sealing element 2, and the fixed structure 42 can be located on the valve body 1, with the elastic structure 41 abutting against the fixed structure 42 on the side closest to the sealing element 2. Alternatively, the elastic structure 41 can be located on the valve body 1, with the fixed structure 42 located on the elastic structure 41, and the fixed structure 42 abutting against the elastic structure 41 on the side closest to the sealing element 2.

[0052] In one implementation, at least a portion of the elastic structure 41 is transversely disposed at the vent. One end of the fixed structure 42 is connected to the side wall of the pressure relief channel 11 or the seal 2, and the other end extends to and abuts against the elastic structure 41. This connection method improves the stability between the elastic structure 41 and the fixed structure 42, thereby ensuring a tight connection between the seal 2 and the valve body 1. When the explosion-proof valve is in its normal state, the elastic structure 41 of the limiting mechanism 4 abuts against the fixed structure 42. The elastic structure 41 can be in a stretched state or in a state that is neither stretched nor compressed, depending on the actual situation.

[0053] Furthermore, the fixed structure 42 is provided with a positioning part 421 at the contact point with the elastic structure 41 for positioning the elastic structure 41. The positioning part 421 can be used by slotting or by snap-fit ​​to position the elastic structure 41, thereby avoiding the situation where the relative sliding between the elastic structure 41 and the fixed structure 42 leads to contact failure or even detachment, thus improving the connection reliability between the seal 2 and the valve body 1, thereby preventing the cover from being accidentally opened due to the seal falling off.

[0054] When the explosion-proof valve is in its normal state, the elastic structure 41 and the fixed structure 42 are in contact with each other. The elastic structure 41, utilizing its elastic properties, can hold the fixed structure 42 in place if the seal 2 tends to detach from the valve body 1 due to vibration, impact, or other forces. This ensures a relatively stable connection between the seal 2 and the valve body 1, preventing the seal 2 from detaching from the valve body 1 under vibration or impact, thus avoiding valve failure. It is understandable that the specific arrangement of the elastic structure 41 and the fixed structure 42 can be determined according to actual conditions, as long as they can provide a stable connection between the seal 2 and the valve body 1 when the explosion-proof valve is in its normal state.

[0055] When the explosion-proof valve is in the depressurization state, the seal 2 is impacted away from the valve body 1 by the depressurization airflow. At this time, the elastic structure 41 is stretched and deformed, and after the impact force reaches a certain level, it finally breaks away from the limit of the fixed structure 42, so that the seal 2 is smoothly separated from the valve body 1. The seal 2 is now located outside the explosion-proof valve, avoiding the seal 2 from blocking the depressurization channel 11 and ensuring the depressurization effect of the depressurization channel 11.

[0056] See Figure 3 and combined Figure 1-2 , Figure 3 The diagram illustrates the structure of the seal and part of the limiting mechanism provided in the embodiments of this application.

[0057] The elastic structure 41 includes a rubber ring 411 and a rubber strip 412 connected to the rubber ring 411, the rubber strip 412 extending across the middle of the rubber ring 411. The rubber ring 411 is fitted onto the outer side of the sealing member 2 or the side wall of the pressure relief channel 11, and the sealing member 2 is sealed by the rubber ring 411 against the side wall of the pressure relief channel 11. The rubber strip 412 abuts against one side of the fixing structure 42.

[0058] In one embodiment, the rubber ring 411 of the elastic structure 41 and the sealing element 2 can be integrally injection molded, i.e., formed by rubber overmolding, thereby ensuring the reliability of the connection between the sealing element 2 and the elastic structure 41, and improving the sealing degree of the sealing element 2 after it abuts against the side wall of the pressure relief channel 11 through the rubber ring 411. Of course, the rubber ring 411 and the sealing element 2 can also be detachably connected. In another embodiment, the rubber ring 411 can also be disposed on the side wall of the pressure relief channel 11, and the sealing element 2 achieves a seal with the side wall of the pressure relief channel 11 by being embedded in the rubber ring 411. Furthermore, the rubber ring 411, the sealing element 2, and the side wall of the pressure relief channel 11 can be detachably connected, thereby facilitating the disassembly and assembly of the explosion-proof valve.

[0059] In one embodiment, the seal 2 may also be provided with a plurality of protrusions 21, which can be used to abut against the cover 5 and other structures to provide a ventilation channel.

[0060] To prevent the seal 2 from being ejected during the pressure relief process of the explosion-proof valve and causing injury to personnel, the elastic structure 41 also includes a connecting part 43, which is fixedly connected to the seal 2 or the valve body 1. The connecting part 43 is configured such that when the explosion-proof valve is in the pressure relief state, the seal 2 remains connected to the valve body 1 through the connecting part 43, so that the seal 2 will not be ejected too far while ensuring the pressure relief effect of the explosion-proof valve, thus avoiding injury to personnel.

[0061] See Figure 4 The figure shows another explosion-proof valve structure provided in an embodiment of this application.

[0062] In one embodiment, such as Figure 4 As shown, in addition to the valve body 1, the sealing element 2 and the waterproof and breathable membrane 3, the explosion-proof valve may also include a pressure ring 31, a cover body 5 and an external sealing ring 6.

[0063] The valve body 1 has a pressure relief channel 11 in its middle. A sealing element 2 is disposed within the pressure relief channel 11 and abuts against the side wall of the channel 11 for sealing. The sealing element 2 has vent holes for ventilation. A waterproof and breathable membrane 3 covers the vent holes. A limiting mechanism 4 is also provided between the sealing element 2 and the valve body 1. The limiting mechanism 4 includes an elastic structure 41 and a fixed structure 42 that abuts against the elastic structure 41. The limiting mechanism 4 is configured to maintain contact between the sealing element 2 and the valve body 1 when the explosion-proof valve is in its normal state. The limiting mechanism 4 is also configured to allow the sealing element 2 to detach from the valve body 1 when the explosion-proof valve is in a pressure relief state.

[0064] The cover 5 covers the pressure relief channel 11, and a gap for ventilation is provided between the cover 5 and the valve body 1. Through this gap, the gas in the pressure relief channel 11 inside the cover 5 can communicate with the outside, so that even though the explosion-proof valve is designed with a cover 5 on the valve body 1, it can still achieve a certain degree of ventilation function while ensuring that the cover 5 provides a certain degree of protection against mud, sand, and dust for the internal components of the explosion-proof valve. In this embodiment, the sealing element 2 and the cover 5 are fixedly connected, thereby fixing the waterproof and breathable membrane 3 to the cover 5, and making the sealing element 2, the waterproof and breathable membrane 3, and the cover 5 form a whole, so that the sealing element 2 can be detached from the valve body 1 along with the cover 5 during pressure relief, ensuring pressure relief performance. Of course, the cover 5 and the sealing element 2 can also simply abut against each other, or the cover 5 and the sealing element 2 can be not connected. The cover 5 can be fixed to the valve body 1 only by common snaps, interference fits, etc. Whether the cover 5 and the sealing element 2 are connected or not does not affect the application of this embodiment.

[0065] In a further embodiment, the cover 5 is provided with a pressing part 51, which is located near the waterproof and breathable membrane 3 and is used to press and fix the waterproof and breathable membrane 3. When the cover 5 is installed, the pressure ring 31 presses the waterproof and breathable membrane 3 against the vent hole of the seal 2. At the same time, the pressing part 51 of the cover 5 applies a pressing force to the pressure ring 31, thereby fixing the waterproof and breathable membrane 3 to the seal 2 and further positioning the seal 2. This prevents the seal 2 and the waterproof and breathable membrane 3 from shifting due to ordinary vibration or impact, avoiding the seal 2 from hitting the cover 5 and falling off, thus improving the structural stability of the explosion-proof valve. At the same time, the pressing part 51 is provided with an opening 52 for ventilation. The airflow inside and outside the explosion-proof valve can flow out or in through the opening 52 of the pressing part 51 without affecting the use of the waterproof and breathable membrane 3, thereby ensuring the realization of the waterproof and breathable function of the explosion-proof valve.

[0066] See Figure 5 The figure shows a schematic diagram of the explosion-proof valve provided in an embodiment of this application from another explosion perspective.

[0067] In another embodiment, such as Figure 5 As shown, in addition to the valve body 1, sealing element 2, and waterproof and breathable membrane 3, the explosion-proof valve may also include a cover 5 and an external sealing ring 6. Figure 4 The difference in the embodiment is that the design of the pressure ring 31 is eliminated, and the pressing part 51 is extended directly to the waterproof and breathable membrane 3, so that the pressing part 51 directly presses the waterproof and breathable membrane 3 onto the seal 2, and further plays a positioning role for the seal 2, reducing the use of parts and improving the reliability of the structure.

[0068] Furthermore, the opening 52 of the crimping part 51 is located near the top of the cover 5, and a corresponding groove is provided to guide the airflow into or out of the gap between the cover 5 and the valve body 1, thereby achieving the effect of air permeability.

[0069] It is understandable that the design of the crimping part 51 and the opening 52 on the cover 5 can be modified according to actual needs in order to position the sealing element 2 and the waterproof and breathable membrane 3 without affecting the breathability. This application does not limit the design of the crimping part 51 and the opening 52.

[0070] Please see Figure 6-7 The figure shows a schematic diagram of the application scenario of the explosion-proof valve provided in the embodiment of this application.

[0071] like Figure 6 As shown, when the explosion-proof valve is in its normal state, that is, when the air pressure inside the power battery system enclosure is relatively balanced with the air pressure outside the enclosure, or when the pressure difference is less than the pressure relief threshold of the explosion-proof valve, the gas inside the power battery system enclosure can flow out to the outside of the explosion-proof valve through the pressure relief channel 11 of the valve body 1, through the seal 2, the waterproof and breathable membrane 3, and the gap between the cover 5 and the valve body 1. Similarly, the gas outside the power battery system enclosure can also reach the inside of the enclosure through the gap between the cover 5 and the valve body 1, through the waterproof and breathable membrane 3 and the seal 2 in the pressure relief channel 11, thus completing the exchange of airflow.

[0072] At this time, the fixed structure 42 and the elastic structure 41 in the limiting assembly are in contact. The elastic structure 41 is connected to the seal 2, and the fixed structure 42 is connected to the valve body 1. The rubber strip 412 of the elastic structure 41 is located on the side away from the seal 2. When the housing vibrates or is impacted, a positive pressure difference occurs inside the housing relative to the outside. Due to the limited permeability of the waterproof and breathable membrane 3, the airflow will impact the seal 2 in the direction of the explosion-proof valve. At this time, because the fixed structure 42 is relatively fixed, the elastic structure 41 can pull the fixed structure 42, so that the seal 2 does not have relative displacement with respect to the valve body 1, thus ensuring the connection stability between the seal 2 and the valve body 1.

[0073] like Figure 7 As shown, combined Figure 6 If the battery or circuit board or other components inside the power battery system box experience thermal runaway, it will instantly heat the air inside the box, causing the air pressure inside the box to rise sharply. When the air pressure inside the box reaches a certain level, the pressure difference between the inside and outside of the box exceeds the pressure relief threshold of the explosion-proof valve. The airflow will impact the seal 2, the waterproof and breathable membrane 3, and the cover 5, thereby causing the above structures to generate a force relative to the valve body 1 that causes it to detach.

[0074] At this point, although the fixed structure 42 and the elastic structure 41 in the limiting assembly are still in contact initially, the impact force causes the seal 2 to exert a pulling force on the elastic structure 41 towards the outside of the explosion-proof valve. After being stretched and deformed, the elastic structure 41 also exerts an outward pulling force on the fixed structure 42. Since one end of the fixed structure 42 is fixed to the valve body 1, while the other end is not connected to the valve body 1, there is a certain gap between it and the side wall on the other side. Ultimately, the elastic structure 41 is released from the contact of the fixed structure 42 and detaches from the gap, allowing the seal 2 to smoothly detach and move away from the valve body 1. The pressure relief channel 11 is fully open and will not be blocked. Alternatively, when the pulling force generated by the seal 2 on the elastic structure 41 reaches a large value, the deformation of the elastic structure 41 exceeds the limit, causing the elastic structure 41 to break. This allows the elastic structure 41 to detach from the restraint of the fixed structure 42, allowing the seal 2 to smoothly detach and move away from the valve body 1.

[0075] See Figure 8 The figure shows another cross-sectional structural schematic diagram of the explosion-proof valve provided in an embodiment of this application.

[0076] like Figure 8 As shown, the explosion-proof valve includes a valve body 1 and a cover 5. The valve body 1 has a pressure relief channel 11 in the middle, and the cover 5 is located inside the pressure relief channel 11 and abuts against the side wall of the pressure relief channel 11. The cover 5 is used to seal the pressure relief channel 11. A limiting mechanism 4 is also provided between the cover 5 and the valve body 1. The limiting mechanism 4 is configured to keep the valve body 1 abutting against the valve body 1 when the explosion-proof valve is in a normal state; the limiting mechanism 4 is also configured to allow the cover 5 to detach from the valve body 1 when the explosion-proof valve is in a pressure relief state.

[0077] and Figure 1-7 Unlike the previous embodiment, this explosion-proof valve does not have a sealing element 2. Instead, the cover 5 and the valve body 1 are sealed by an interference fit. At the same time, the cover 5 and the valve body 1 do not have an air-permeable function.

[0078] The limiting mechanism 4 is configured to keep the cover 5 in contact with the valve body 1 when the explosion-proof valve is in a normal state; the limiting mechanism 4 is also configured to allow the cover 5 to detach from the valve body 1 when the explosion-proof valve is in a depressurized state.

[0079] In one embodiment, the elastic structure 41 is disposed on one side of the cover 5, and the fixing structure 42 is disposed on the valve body 1; when the cover 5 and the valve body 1 are sealed, the elastic structure 41 abuts against the fixing structure 42 on the side closer to the cover 5.

[0080] When the enclosure vibrates or is impacted, a positive pressure difference occurs inside the enclosure relative to the outside, causing the airflow to impact the cover 5 in the direction of the explosion-proof valve. At this time, due to the relative fixation of the fixed structure 42, the elastic structure 41 can pull the fixed structure 42, so that the cover 5 does not have relative displacement with respect to the valve body 1, thus ensuring the connection stability between the cover 5 and the valve body 1.

[0081] If the battery or circuit board or other components inside the power battery system box experience thermal runaway, it will instantly heat the air inside the box, causing the air pressure inside the box to rise sharply. When the air pressure inside the box reaches a certain level, the pressure difference between the inside and outside of the box exceeds the pressure relief threshold of the explosion-proof valve. The airflow will impact the cover 5, causing the above structure to generate a force relative to the valve body 1 that causes it to detach.

[0082] At this point, although the fixed structure 42 and the elastic structure 41 in the limiting assembly are still in contact initially, the impact force causes the cover 5 to exert a pulling force on the elastic structure 41 towards the outside of the explosion-proof valve. After the elastic structure 41 is stretched and deformed, it also exerts an outward pulling force on the fixed structure 42. Since one end of the fixed structure 42 is fixed to the valve body 1, while the other end is not connected to the valve body 1, there is a certain gap between it and the side wall on the other side. Ultimately, the elastic structure 41 is released from the contact of the fixed structure 42 and detaches from the gap, allowing the cover 5 to smoothly detach and move away from the valve body 1. The pressure relief channel 11 is fully open and will not be blocked. Alternatively, when the pulling force generated by the cover 5 on the elastic structure 41 reaches a large value, the deformation of the elastic structure 41 exceeds the limit, causing the elastic structure 41 to break. This allows the elastic structure 41 to detach from the restraint of the fixed structure 42, allowing the cover 5 to smoothly detach and move away from the valve body 1.

[0083] In another embodiment, the elastic structure 41 is disposed on the valve body 1, and the fixing structure 42 is disposed on the cover 5; when the cover 5 and the valve body 1 are in contact and sealed, the fixing structure 42 abuts against the elastic structure 41 on the side closest to the cover 5. The connection method of the limiting mechanism 4 in this embodiment can also achieve the technical effect of improving the reliability of the explosion-proof valve. Of course, the specific installation method can be determined according to the actual situation.

[0084] Furthermore, at least a portion of the elastic structure 41 is transversely disposed at the pressure relief channel 11. One end of the fixing structure 42 is connected to the side wall or cover 5 of the pressure relief channel 11, and the other end extends to and abuts against the elastic structure 41, thereby further improving the stability between the cover 5 and the valve body 1. More specifically, the fixing structure 42 is provided with a positioning part 421 for positioning the elastic structure 41 at the abutment point with the elastic structure 41.

[0085] The elastic structure 41 includes a rubber ring 411 and a rubber strip 412 connected to the rubber ring 411. The rubber strip 412 extends across the middle of the rubber ring 411. The rubber ring 411 is fitted onto one side of the cover 5 or the side wall of the pressure relief channel 11. The cover 5 is sealed to the side wall of the pressure relief channel 11 by the rubber ring 411, and the rubber strip 412 abuts against one side of the fixing structure 42. In one embodiment, the rubber ring 411 can be fitted onto the cover 5, allowing the cover 5 to abut against and seal the valve body 1, thereby improving the sealing performance of the cover 5. In another embodiment, the rubber ring 411 can also be disposed on the side wall of the pressure relief channel 11 of the valve body 1, and the cover 5 completes the sealing of the pressure relief channel 11 by fastening it onto the rubber ring 411. The rubber ring 411 of the elastic structure 41 and the cover 5 can be integrally injection molded, that is, formed by rubber overmolding, thereby ensuring the reliability of the connection between the cover 5 and the elastic structure 41, and improving the sealing degree of the cover 5 after it abuts against the side wall of the pressure relief channel 11 through the rubber ring 411. Of course, the rubber ring 411 and the cover 5 can also be detachably connected. In another embodiment, the rubber ring 411 can also be provided on the side wall of the pressure relief channel 11, and the cover 5 achieves a seal with the side wall of the pressure relief channel 11 by embedding it into the rubber ring 411. Furthermore, the rubber ring 411 and the cover 5 and the side wall of the pressure relief channel 11 can be detachably connected, thereby facilitating the disassembly and assembly of the explosion-proof valve.

[0086] Of course, the structure and installation method of the limiting mechanism 4 can be determined according to the actual situation, and this application does not limit it.

[0087] Understandably, the specific implementation methods and sealing principles of other parts of this explosion-proof valve can be found by referring to... Figure 1-7 Any related embodiments will not be described in detail here.

[0088] Please see Figure 9 The figure shows a schematic diagram of the architecture of the power battery system provided in an embodiment of this application.

[0089] like Figure 9As shown, the power battery system 100 includes a housing 120 and an explosion-proof valve 110. The housing 120 houses the power battery, and the explosion-proof valve 110 is installed on the housing 120. The explosion-proof valve 110 can be fixed to the housing 120 by means of screws, clips, etc. The housing 120 can achieve pressure relief and waterproof / ventilation functions through the explosion-proof valve 110. The power battery in the housing 120 can be a lithium battery, sodium-ion battery, fuel cell, etc. Of course, in addition to the power battery, the power battery system 100 may also include other structures, such as protection circuits for battery overvoltage / overcurrent protection, starting circuits, cables, etc. This application does not limit the specific sub-modules included in the power battery system 100.

[0090] It is understood that when the power battery system 100 adopts the explosion-proof valve 110 of this application, it not only improves the connection stability between the seal and the valve body or between the cover and the valve body under normal conditions, but also does not affect the separation between the seal and the valve body or between the cover and the valve body under the pressure relief state, thereby enabling the explosion-proof valve 110 to obtain a more stable and reliable pressure relief and explosion-proof effect.

[0091] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0092] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0095] The above content is merely an example and illustration of the structure of this application, and its description is quite specific and detailed, but it should not be construed as limiting the scope of this patent application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these obvious substitutions all fall within the protection scope of this application.

Claims

1. An explosion-proof valve, characterized in that, include: The valve body has a pressure relief channel in the middle; A sealing element, disposed within the pressure relief channel and abutting against the side wall of the pressure relief channel for sealing, the sealing element having vent holes for ventilation; and A waterproof and breathable membrane is used to cover the vent holes; A limiting mechanism is provided between the sealing element and the valve body. The limiting mechanism includes an elastic structure and a fixed structure that abuts against the elastic structure. The limiting mechanism is configured to keep the seal in contact with the valve body when the explosion-proof valve is in a normal state; the limiting mechanism is also configured to allow the seal to detach from the valve body when the explosion-proof valve is in a depressurized state.

2. The explosion-proof valve as described in claim 1, characterized in that: The elastic structure is disposed on the sealing element, and the fixing structure is disposed on the valve body; when the sealing element and the valve body abut and seal, the elastic structure abuts against the fixing structure on the side closer to the sealing element; or The elastic structure is disposed on the valve body, and the fixing structure is disposed on the sealing element; when the sealing element abuts and seals with the valve body, the fixing structure abuts against the elastic structure on the side closer to the sealing element.

3. The explosion-proof valve as described in claim 2, characterized in that: The elastic structure is at least partially disposed transversely at the vent hole; One end of the fixed structure is connected to the side wall or seal of the pressure relief channel, and the other end extends to one side of the elastic structure and abuts against the elastic structure.

4. The explosion-proof valve as described in claim 3, characterized in that: The fixing structure has a positioning part at the contact point with the elastic structure for positioning the elastic structure.

5. The explosion-proof valve as described in claim 2, characterized in that, The elastic structure includes a rubber ring and a rubber strip connected to the rubber ring; the rubber strip runs through the middle of the rubber ring; The rubber ring is sleeved on the outside of the seal or disposed on the side wall of the pressure relief channel, and the seal is sealed by the rubber ring abutting against the side wall of the pressure relief channel. The adhesive strip abuts against one side of the fixing structure.

6. The explosion-proof valve as described in claim 4, characterized in that, The elastic structure further includes: A connecting part is fixedly connected to the seal or valve body, and the connecting part is configured such that when the explosion-proof valve is in a depressurized state, the seal remains connected to the valve body through the connecting part.

7. The explosion-proof valve as described in claim 1, characterized in that, The explosion-proof valve also includes: A cover is provided over the pressure relief channel, and a gap for ventilation is provided between the cover and the valve body.

8. The explosion-proof valve as described in claim 7, characterized in that, The cover is provided with a pressing part, which is located on the side close to the waterproof and breathable membrane, and is used to press and fix the waterproof and breathable membrane.

9. The explosion-proof valve as described in claim 8, characterized in that, The crimping part is provided with an opening for ventilation.

10. A power battery system, characterized in that, The power battery system includes: The enclosure containing the power battery; and An explosion-proof valve is installed on the enclosure, and the explosion-proof valve is the explosion-proof valve as described in any one of claims 1-9.

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