Explosion-proof valve, battery pack and vehicle

Abstract

The embodiment of the invention provides an anti-explosion valve, a battery pack and a vehicle, the anti-explosion valve is applied to a shell of the battery pack, the shell is provided with a first opening, and the anti-explosion valve comprises an anti-explosion valve body, a plugging piece and a first moisture absorption deformation piece; the anti-explosion valve body is provided with a second opening, the anti-explosion valve body is connected to the shell, and the first opening is communicated with the second opening; the plugging piece covers the second opening and is movably connected to the side, away from the shell, of the anti-explosion valve body. The first moisture absorption deformation piece is arranged between the anti-explosion valve body and the plugging piece; and under the condition that liquid is generated in the battery pack, the first moisture absorption deformation part absorbs the liquid to generate expansion, a gap is formed between the plugging part and the anti-explosion valve body, and the plugging part unblocks the second opening of the anti-explosion valve body so as to discharge the liquid. The first moisture absorption deformation part absorbs liquid to generate expansion, the plugging part is driven to move away from the anti-explosion valve body, a gap is formed between the plugging part and the anti-explosion valve body, plugging of the second open hole is relieved, accumulated liquid in the battery pack is discharged, and the influence on the performance of the battery pack is reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to an explosion-proof valve, a battery pack, and a vehicle. Background Technology

[0002] The battery pack is an important power source for vehicles. The battery pack casing is usually equipped with an explosion-proof valve to balance the pressure difference between the inside and outside of the battery pack in the event of thermal runaway, which has a significant impact on the safety performance of the battery pack.

[0003] In the prior art, explosion-proof valves typically include a body and a sealing plate that is movably connected to the body. When the battery pack experiences thermal runaway, the high-temperature gas drives the sealing plate to move away from the body to exhaust gas, thereby balancing the pressure difference inside and outside the battery pack.

[0004] However, during their research on existing technologies, the inventors discovered that when liquid accumulates in the battery pack, the explosion-proof valve cannot drain the liquid, which can easily affect the electrical and safety performance of the battery pack. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide an explosion-proof valve, battery pack and vehicle that overcomes or at least partially solves the above problems.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] In a first aspect, embodiments of this application propose an explosion-proof valve applied to the housing of a battery pack, the housing having a first opening, the explosion-proof valve comprising: an explosion-proof valve body, a sealing element, and a first moisture-absorbing deformation element;

[0008] The explosion-proof valve body is provided with a second opening, the explosion-proof valve body is connected to the housing, and the first opening communicates with the second opening;

[0009] The sealing element covers the second opening and is movably connected to the side of the explosion-proof valve body away from the housing;

[0010] The first moisture-absorbing deformation element is disposed between the explosion-proof valve body and the sealing element;

[0011] When liquid is generated inside the battery pack, the first hygroscopic deformation element absorbs the liquid and expands, forming a gap between the sealing element and the explosion-proof valve body, and the sealing element releases the seal on the second opening of the explosion-proof valve body to drain the liquid.

[0012] Optionally, the battery pack further includes an air duct assembly and a second moisture-absorbing deformation element;

[0013] The air duct assembly is connected to the sealing member, and the air duct assembly is slidably connected to the explosion-proof valve body. The second moisture-absorbing deformation member is disposed between the air duct assembly and the explosion-proof valve body.

[0014] When liquid is generated inside the battery pack and there is liquid outside the battery pack, the first moisture-absorbing deformation member and the second moisture-absorbing deformation member absorb the liquid and expand. The second moisture-absorbing deformation member drives the air duct assembly to move the sealing member toward the explosion-proof valve body so that the sealing member seals the second opening of the explosion-proof valve body.

[0015] Optionally, the explosion-proof valve body is provided with a mounting groove on the side of the air duct assembly away from the sealing member, and the second moisture-absorbing deformation member is disposed in the mounting groove and connected to the air duct assembly;

[0016] When the second moisture-absorbing deformation element absorbs liquid and expands, the second moisture-absorbing deformation element drives the air guide tube assembly to slide away from the explosion-proof valve body, thereby causing the sealing element to move toward the explosion-proof valve body.

[0017] Optionally, the air duct assembly has a groove at a position corresponding to the mounting groove, the mounting groove and the groove enclose a receiving space, and the second moisture-absorbing deformation element is disposed in the receiving space.

[0018] Optionally, the air guide assembly includes an air guide tube and an elastic element;

[0019] The air guide tube is slidably connected to the explosion-proof valve body, and the air guide tube extends away from the sealing member. One end of the elastic member is connected to the explosion-proof valve body, and the other end of the elastic member is connected to the air guide tube.

[0020] Optionally, the air guide tube includes a sliding portion and a connecting portion connected to the sliding portion;

[0021] The sliding part is connected to the sealing member, and the sliding part is slidably connected to the explosion-proof valve body. The connecting part extends away from the sealing member, and the other end of the elastic member is connected to the connecting part.

[0022] Optionally, the water absorption swelling rate of the first moisture-absorbing deformation component is a first water absorption swelling rate, and the water absorption swelling rate of the second moisture-absorbing deformation component is a second water absorption swelling rate, wherein the second water absorption swelling rate is greater than the first water absorption swelling rate.

[0023] Optionally, the battery pack further includes a sealing element disposed between the explosion-proof valve body and the plugging element, and the sealing element is connected to the outer periphery of the second opening of the explosion-proof valve body;

[0024] When the plugging member is plugged into the second opening of the explosion-proof valve body, the plugging member is pressed against the sealing member to seal the second opening.

[0025] Secondly, embodiments of this application provide a battery pack, the battery pack including the aforementioned explosion-proof valve.

[0026] Thirdly, embodiments of this application provide a vehicle that includes the aforementioned battery pack.

[0027] Optionally, the explosion-proof valve body of the battery pack is connected to the bottom of the housing, and the bottom of the housing is the side of the housing close to the chassis of the vehicle.

[0028] In this embodiment, the explosion-proof valve is applied to the housing of a battery pack. The housing has a first opening. The explosion-proof valve includes an explosion-proof valve body, a sealing element, and a first moisture-absorbing deformation element. The explosion-proof valve body has a second opening and is connected to the housing, with the first opening communicating with the second opening. The sealing element covers the second opening and is movably connected to the side of the explosion-proof valve body away from the housing. The first moisture-absorbing deformation element is disposed between the explosion-proof valve body and the sealing element. When liquid is generated inside the battery pack, the first moisture-absorbing deformation element absorbs the liquid and expands, forming a gap between the sealing element and the explosion-proof valve body. The sealing element releases the seal on the second opening of the explosion-proof valve body to drain the liquid. In this way, when liquid accumulates inside the battery pack, some of the liquid can be absorbed by the first moisture-absorbing deformation element. The first moisture-absorbing deformation element expands due to moisture absorption, driving the sealing element to move away from the explosion-proof valve body. This creates a gap between the sealing element and the explosion-proof valve body, allowing the sealing element to release its blockage of the second opening of the explosion-proof valve body, thus opening the second opening to the outside. This allows the liquid inside the battery pack to drain out through the first opening of the housing along the second opening of the explosion-proof valve body, achieving timely drainage of the liquid inside the battery pack. This gives the explosion-proof valve structure a drainage function, reducing the impact on the electrical and safety performance of the battery pack.

[0029] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0031] Figure 1 This is a partial structural diagram of an explosion-proof valve applied to a battery pack according to an embodiment of this application;

[0032] Figure 2 This is one of the partial side views of an explosion-proof valve applied to a battery pack according to an embodiment of this application;

[0033] Figure 3 This is a second partial side view of an explosion-proof valve applied to a battery pack, as described in an embodiment of this application.

[0034] Figure 4 This is a partial side view of an explosion-proof valve applied to a battery pack, as described in an embodiment of this application.

[0035] Reference numerals: 10 – housing; 20 – explosion-proof valve body; 30 – sealing element; 40 – first moisture-absorbing deformation element; 11 – first opening; 21 – second opening; 50 – second moisture-absorbing deformation element; 22 – mounting groove; 61 – groove; 601 – accommodating space; 62 – air guide pipe; 63 – elastic element; 64 – sliding part; 65 – connecting part; 23 – sealing element; 24 – second sealing element. Detailed Implementation

[0036] Embodiments of the present invention will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0037] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Reference Figures 1 to 4 This diagram illustrates a partial structural schematic of an explosion-proof valve applied to a battery pack according to an embodiment of this application. The battery pack includes a housing 10 with a first opening 11. The explosion-proof valve specifically includes an explosion-proof valve body 20, a sealing element 30, and a first moisture-absorbing deformation element 40. The explosion-proof valve body 20 has a second opening 21 and is connected to the housing 10, with the first opening 11 communicating with the second opening 21. The sealing element 30 covers the second opening 21 and is movably connected to the side of the explosion-proof valve body 20 away from the housing 10, for sealing the second opening 21. The first moisture-absorbing deformation element 40 is disposed between the explosion-proof valve body 20 and the sealing element 30. When liquid is generated inside the battery pack, the first moisture-absorbing deformation element 40 absorbs the liquid and expands, forming a gap between the sealing element 30 and the explosion-proof valve body 20. The sealing element 30 then releases the seal on the second opening 21 of the explosion-proof valve body 20 to drain the liquid.

[0041] In this embodiment, liquid may accumulate inside the battery pack due to leakage. When liquid accumulates inside the battery pack, some of the liquid can be absorbed by the first moisture-absorbing deformation member 40. The first moisture-absorbing deformation member 40 expands due to moisture absorption, driving the sealing member 30 to move away from the explosion-proof valve body 20. This creates a gap between the sealing member 30 and the explosion-proof valve body 20, allowing the sealing member 30 to release the seal on the second opening 21 of the explosion-proof valve body 20, thus connecting the second opening 21 to the outside. This allows the liquid inside the battery pack to drain out of the battery pack from the first opening 11 of the housing 10 along the second opening 21 of the explosion-proof valve body 20, achieving timely drainage of the liquid inside the battery pack. This gives the explosion-proof valve structure a drainage function, reducing the impact on the electrical and safety performance of the battery pack.

[0042] Specifically, in this embodiment, the first hygroscopic deformation element 40 is a hygroscopic expansion element. When it absorbs liquid or water vapor, it expands. When the liquid or water vapor evaporates, causing the first hygroscopic deformation element 40 to dry, it shrinks back to its initial shape. For example, the first hygroscopic deformation element 40 can be sodium polyacrylate (SAP), also known as absorbent resin. It can also be calcium chloride, calcium oxide, cellulose triacetate sheets, etc. This embodiment does not limit the specific type of the first hygroscopic deformation element 40. Furthermore, the first hygroscopic deformation element 40 can be a sheet structure or a block structure; this embodiment also does not limit the specific shape type of the first hygroscopic deformation element 40.

[0043] In this embodiment, the first moisture-absorbing deformation element 40 is disposed between the explosion-proof valve body 20 and the sealing element 30. For example, the first moisture-absorbing deformation element 40 can be connected to the sealing element 30. When the first moisture-absorbing deformation element 40 absorbs liquid and expands, the end of the first moisture-absorbing deformation element 40 near the explosion-proof valve body 20 expands towards the explosion-proof valve and pushes the sealing element 30 away from the explosion-proof valve body 20. Alternatively, the first moisture-absorbing deformation element 40 can also be connected to the explosion-proof valve body 20. When the first moisture-absorbing deformation element 40 absorbs liquid and expands, the end of the first moisture-absorbing deformation element 40 near the sealing element 30 expands towards the sealing element 30 and pushes the sealing element 30 away from the explosion-proof valve body 20. In addition, the first moisture-absorbing deformation element 40 can also be connected to the explosion-proof valve body 20 and the sealing element 30 respectively. When the first moisture-absorbing deformation element 40 absorbs liquid and expands, the first moisture-absorbing deformation element 40 expands and pushes the sealing element 30 away from the explosion-proof valve body 20. The specific connection method of the first moisture-absorbing deformation element 40 in this application embodiment is not limited.

[0044] In this embodiment, the battery pack typically includes multiple individual battery cells and other mounting components. The housing 10 provides space for the battery cells and other mounting components and provides protection for the battery pack. For example, the housing 10 can be made of aluminum or aluminum alloy, which are commonly used and readily available, have good ductility for easy processing, and possess good structural strength and corrosion resistance. This embodiment does not limit the specific material of the housing 10.

[0045] Specifically, in this embodiment, the explosion-proof valve body 20 is fixedly connected to the housing 10. For example, the explosion-proof valve body 20 can be fixed to the housing 10 by fasteners such as screws, bolts, or bolts, so that there is a relatively stable and reliable connection between the explosion-proof valve body 20 and the housing 10. The material of the explosion-proof valve body 20 can be metal, such as stainless steel or carbon steel, etc. The specific material of the explosion-proof valve body 20 is not limited in this embodiment.

[0046] In this embodiment, the sealing member 30 is movably connected to the side of the explosion-proof valve body 20 away from the housing 10, enabling switching between sealing and unsealing the second opening 21. For example, the sealing member 30 can be slidably connected to the explosion-proof valve body 20 via a connecting rod, with a spring on the connecting rod to limit and reset its sliding movement. Furthermore, a limiting platform can be provided on the connecting rod to limit its movement relative to the explosion-proof valve body 20. By engaging the limiting platform with the explosion-proof valve body 20, the displacement of the sealing member 30 relative to the explosion-proof valve body 20 driven by the connecting rod is limited.

[0047] Optionally, in this embodiment, the battery pack further includes a venting tube assembly and a second moisture-absorbing deformation element 50; the venting tube assembly is connected to the sealing element 30 and slidably connected to the explosion-proof valve body 20, and the second moisture-absorbing deformation element 50 is disposed between the venting tube assembly and the explosion-proof valve body 20; when liquid is generated inside the battery pack and there is liquid outside the battery pack, the first moisture-absorbing deformation element 40 and the second moisture-absorbing deformation element 50 absorb the liquid and expand, and the second moisture-absorbing deformation element 50 drives the venting tube assembly to move the sealing element 30 toward the explosion-proof valve body 20, so that the sealing element 30 seals the second opening 21 of the explosion-proof valve body 20.

[0048] In this embodiment, when the vehicle drives over a puddle or is sprayed with water, the exterior of the battery pack is also wet. When liquid is generated inside the battery pack and also outside, a significant amount of liquid accumulates at the explosion-proof valve structure. This causes both the first hygroscopic deformation element 40 and the second hygroscopic deformation element 50 to absorb the liquid and expand. At this time, the second hygroscopic deformation element 50 drives the vent pipe assembly to move away from the explosion-proof valve body 20. This, in turn, causes the vent pipe assembly to move the sealing element 30 closer to the explosion-proof valve body 20 until the sealing element 30 abuts against the explosion-proof valve body 20, sealing the second opening 21 and providing better sealing for the battery pack. This prevents liquid outside the battery pack from flowing back into the battery pack through the second opening 21 of the explosion-proof valve body 20.

[0049] When the vehicle exits a puddle or is no longer subjected to water spray, there is no liquid flowing back into the battery pack, meaning the battery pack is no longer in a situation where external liquid could flow into its interior. As the battery pack generates heat during operation, the liquid absorbed by the first hygroscopic deformation element 40 and the second hygroscopic deformation element 50 vaporizes or evaporates, thus gradually drying the first hygroscopic deformation element 40 and the second hygroscopic deformation element 50 and returning them to their initial state. If liquid remains inside the battery pack, the first hygroscopic deformation element 40 absorbs liquid and expands, driving the sealing element 30 to move the vent pipe assembly away from the explosion-proof valve body 20. This creates a gap between the sealing element 30 and the explosion-proof valve body 20, allowing the sealing element 30 to release its blockage of the second opening 21 of the explosion-proof valve body 20 and drain the liquid out of the battery pack. At this time, due to the structural thickness of the second moisture-absorbing deformation component 50, it can also limit the movement of the air duct assembly relative to the explosion-proof valve body 20, thus preventing the gap between the sealing component 30 and the explosion-proof valve body 20 from being too large.

[0050] In some optional embodiments of this application, the first moisture-absorbing deformation member 40 can be connected to the sealing member 30 and the explosion-proof valve body 20 respectively. After the liquid in the battery pack is drained, the first moisture-absorbing deformation member 40 contracts and drives the sealing member 30 to move toward the explosion-proof valve, so that the sealing member 30 returns to the state of sealing the second opening 21. In addition, a return spring can be provided between the sealing member 30 and the explosion-proof valve body 20. The return spring has a tendency to contract, so as to drive the sealing member 30 toward the explosion-proof valve. After the liquid in the battery pack is drained, the return spring drives the sealing member 30 toward the explosion-proof valve under the action of elasticity, so that the sealing member 30 returns to the state of sealing the second opening 21. This embodiment of the application does not limit this.

[0051] In this embodiment, the second moisture-absorbing deformation member 50 is disposed between the gas duct assembly and the explosion-proof valve body 20. For example, the second moisture-absorbing deformation member 50 can be connected to the explosion-proof valve body 20. When the second moisture-absorbing deformation member 50 absorbs liquid and expands, the end of the second moisture-absorbing deformation member 50 near the gas duct assembly moves towards the gas duct assembly and pushes the gas duct assembly away from the explosion-proof valve body 20. Alternatively, the second moisture-absorbing deformation member 50 can also be connected to the gas duct assembly. When the second moisture-absorbing deformation member 50 absorbs liquid and expands, the expanded second moisture-absorbing deformation member 50 abuts against the explosion-proof valve body 20 and pushes the gas duct assembly away from the explosion-proof valve body 20. In addition, the second moisture-absorbing deformation element 50 can also be connected to the explosion-proof valve body 20 and the air guide tube assembly respectively. When the second moisture-absorbing deformation element 50 absorbs liquid and expands, the second moisture-absorbing deformation element 50 expands and pushes the air guide tube assembly away from the explosion-proof valve body 20. The specific connection method of the second moisture-absorbing deformation element 50 is not limited in the embodiments of this application.

[0052] Specifically, in this embodiment, the second moisture-absorbing deformable element 50 is also a moisture-absorbing expansion element. When it absorbs liquid or water vapor, it expands. When the liquid or water vapor evaporates, causing the second moisture-absorbing deformable element 50 to dry, it shrinks back to its initial shape. For example, the second moisture-absorbing deformable element 50 can also be sodium polyacrylate (SAP), also known as absorbent resin. It can also be calcium chloride, calcium oxide, cellulose triacetate sheets, etc. This embodiment does not limit the specific type of the second moisture-absorbing deformable element 50. Furthermore, the second moisture-absorbing deformable element 50 can be a sheet structure or a block structure. This embodiment also does not limit the specific shape type of the second moisture-absorbing deformable element 50.

[0053] Optionally, in this embodiment, the explosion-proof valve body 20 has a mounting groove 22 on the side opposite to the sealing member 30. The second moisture-absorbing deformation member 50 is disposed in the mounting groove 22 and connected to the air guide tube assembly. When the second moisture-absorbing deformation member 50 absorbs liquid and expands, it drives the air guide tube assembly to slide away from the explosion-proof valve body 20, thereby causing the sealing member 30 to move towards the explosion-proof valve body 20. In this way, the mounting groove 22 provides space for the second moisture-absorbing deformation member 50, giving it better connection reliability. Furthermore, the expansion of the second moisture-absorbing deformation member 50 when absorbing liquid causes the air guide tube assembly to move away from the explosion-proof valve body 20 along its axial direction. Specifically, the air guide tube assembly can be slidably connected to the explosion-proof valve body 20 in the vertical direction. Since the position of the mounting groove 22 of the explosion-proof valve body 20 is fixed, the expansion of the second moisture-absorbing deformation member 50 drives the air guide tube assembly to move away from the explosion-proof valve body 20.

[0054] Optionally, in this embodiment, the air guide tube assembly has a groove 61 at a position corresponding to the mounting groove 22. The mounting groove 22 and the groove 61 enclose a receiving space 601, and the second moisture-absorbing deformable element 50 is disposed within the receiving space 601. Thus, the receiving space 601 formed by the mounting groove 22 and the groove 61 provides a more reliable placement space for the second moisture-absorbing deformable element 50, and restricts the expansion direction of the second moisture-absorbing deformable element 50. Specifically, as... Figure 1 and Figure 4 As shown, the mounting groove 22 of the explosion-proof valve body 20 can be located below the groove 61 of the air guide tube assembly. In this way, since the position of the explosion-proof valve body 20 located below is fixed, when the second moisture-absorbing deformation element 50 absorbs liquid and expands, it can move toward the groove 61 of the air guide tube assembly, thereby driving the air guide tube assembly to move upward away from the explosion-proof valve body 20.

[0055] Optionally, in this embodiment, the air guide tube assembly includes an air guide tube 62 and an elastic element 63. The air guide tube 62 is slidably connected to the explosion-proof valve body 20, and extends away from the sealing element 30. One end of the elastic element 63 is connected to the explosion-proof valve body 20, and the other end of the elastic element 63 is connected to the air guide tube 62. In this way, the air guide tube assembly and the explosion-proof valve body 20 are slidably connected through the air guide tube 62. When the first moisture-absorbing deformation element 40 returns to a dry state, the elastic restoring force of the elastic element 63 drives the air guide tube 62 to move the sealing element 30 toward the explosion-proof valve body 20, providing a relatively stable and reliable reset driving force, so that the sealing element 30 has a good sealing effect on the second opening 21 of the explosion-proof valve body 20.

[0056] For example, in this embodiment, the elastic element 63 can be a spring, which is wound around the outer periphery of the air duct 62, with one end of the spring abutting against the explosion-proof valve body 20 and the other end abutting against the end of the air duct 62 away from the explosion-proof valve body 20. When the air duct 62 moves toward the explosion-proof valve body 20, the spring is compressed, tending to move the air duct 62 away from the explosion-proof valve body 20. When the first moisture-absorbing deformation element 40 returns to a dry state, the spring drives the air duct 62 to move the sealing element 30 toward the explosion-proof valve body 20.

[0057] Optionally, in this embodiment, the air duct 62 includes a sliding portion 64 and a connecting portion 65 connected to the sliding portion 64. The sliding portion 64 is connected to the sealing member 30 and slidably connected to the explosion-proof valve body 20. The connecting portion 65 extends away from the sealing member 30, and a groove 61 is provided between the sliding portion 64 and the connecting portion 65. The other end of the elastic member 63 is connected to the connecting portion 65. In this way, the sliding portion 64 realizes the sliding connection between the air duct 62 and the explosion-proof valve body 20, and the connecting portion 65 realizes the connection between the air duct 62 and the elastic member 63. For example, the diameter of the sliding portion 64 can be smaller than the diameter of the connecting portion 65, so that a stepped groove 61 is formed between the sliding portion 64 and the connecting portion 65.

[0058] For example, in this embodiment, the explosion-proof valve body 20 may have a mounting portion in its central region and a fixing portion in its outer peripheral region. The mounting portion and the fixing portion are connected by a connecting rod. An annular second opening 21 is provided between the mounting portion and the fixing portion, and the connecting rod can divide the second opening 21 into multiple gaps. Furthermore, the housing 10 is connected to the fixing portion in the outer peripheral region, and the vent pipe 62 is slidably connected to the mounting portion in the central region. For example, the mounting portion may have a through hole, and the vent pipe 62 is slidably connected to the through hole. This makes the explosion-proof valve structure layout of the battery pack more reasonable and helps improve space utilization.

[0059] Optionally, in this embodiment, the gas guide tube assembly further includes a housing, which is connected to the explosion-proof valve body 20 and covers the outer periphery of the gas guide tube 62. In this way, the housing protects the gas guide tube 62 and the elastic element 63, preventing them from being easily corroded by high-temperature gases or liquids, thus extending their service life.

[0060] Optionally, in this embodiment, the water absorption expansion rate of the first hygroscopic deformation element 40 is a first water absorption expansion rate, and the water absorption expansion rate of the second hygroscopic deformation element 50 is a second water absorption expansion rate, wherein the second water absorption expansion rate is greater than the first water absorption expansion rate. Thus, because a larger water absorption expansion rate results in greater deformation of both the first and second hygroscopic deformation elements 40 and 50 upon absorbing liquid, the resulting expansion force is also greater. Therefore, when both the first and second hygroscopic deformation elements 40 and 50 absorb liquid and expand, the expansion force generated by the second hygroscopic deformation element 50 can overcome the expansion force of the first hygroscopic deformation element 40, causing the air guide tube assembly to move the sealing element 30 toward the explosion-proof valve body 20, thereby achieving a tighter sealing effect of the sealing element 30 on the second opening 21 of the explosion-proof valve body 20.

[0061] For example, in this embodiment of the application, the first water absorption swelling rate of the first moisture-absorbing deformation element 40 can be greater than or equal to 100%, for example, the first water absorption swelling rate of the first moisture-absorbing deformation element 40 can be 100%, 150%, 180%, or 200%, etc. The second water absorption swelling rate of the second moisture-absorbing deformation element 50 can be greater than or equal to 200%, for example, the second water absorption swelling rate of the second moisture-absorbing deformation element 50 can be 200%, 250%, 280%, or 300%, etc. For example, when the first water absorption swelling rate of the first moisture-absorbing deformation element 40 is 100%, the second water absorption swelling rate of the second moisture-absorbing deformation element 50 can be 200%, 250%, 280%, or 300%, etc.; when the first water absorption swelling rate of the first moisture-absorbing deformation element 40 is 200%, the second water absorption swelling rate of the second moisture-absorbing deformation element 50 can be 250%, 280%, or 300%, etc. The specific values ​​of the first water absorption expansion rate of the first moisture-absorbing deformation element 40 and the second water absorption expansion rate of the second moisture-absorbing deformation element 50 in this embodiment are not limited.

[0062] Optionally, in this embodiment, the battery pack further includes a sealing element 23, which is disposed between the explosion-proof valve body 20 and the plugging element 30, and connected to the outer periphery of the second opening 21 of the explosion-proof valve body 20. When the plugging element 30 blocks the second opening 21 of the explosion-proof valve body 20, the plugging element 30 is pressed against the sealing element 23 to seal the second opening 21. Thus, when the plugging element 30 blocks the second opening 21, the connection between the explosion-proof valve body 20 and the plugging element 30 is sealed by the sealing element 23, improving the sealing performance of the battery pack and preventing leakage. For example, the sealing element 23 can be a sealing ring or a sealing gasket, and the material of the sealing element 23 can be rubber or silicone, etc. This embodiment does not limit the specific type and material of the sealing element 23.

[0063] Optionally, in this embodiment, a second sealing element 24 may be provided between the housing 10 and the explosion-proof valve body 20 to enhance the waterproof sealing between the housing 10 and the explosion-proof valve body 20. Specifically, the second sealing element 24 may be disposed on the outer periphery of the first opening 11 of the housing 10 and the second opening 21 of the explosion-proof valve body 20 to seal and waterproof the area around the first opening 11 and the second opening 21, preventing water from seeping into other structures inside the housing 10 from the first opening 11 or the second opening 21. The second sealing element 24 may be a sealing ring or a sealing gasket, and the material of the second sealing element 24 may be rubber or silicone, etc. The specific type and material of the second sealing element 24 are not limited in this embodiment.

[0064] Specifically, in this embodiment of the application, the battery pack can have four operating conditions during operation. In the first operating condition, such as... Figure 2 As shown, no liquid accumulation or thermal runaway occurred inside the battery pack. Both the first moisture-absorbing deformation element 40 and the second moisture-absorbing deformation element 50 were dry. The sealing element 30 was connected to the vent pipe 62, and under the action of the elastic element 63, the position of the vent pipe 62 was restricted, causing the sealing element 30 to seal the second opening 21 of the explosion-proof valve body 20. Furthermore, the sealing element 30 abutted against the sealing element 23 on the outer periphery of the second opening 21 of the explosion-proof valve body 20, ensuring the battery pack was in a relatively sealed state.

[0065] In the second working condition, such as Figure 3As shown, in a situation where there is liquid accumulation in the battery pack but no thermal runaway has occurred, such as internal leakage, the liquid accumulation is small and has not spread to the location of the second moisture-absorbing deformation element 50. In this case, the lower first moisture-absorbing deformation element 40 absorbs liquid and expands, while the upper second moisture-absorbing deformation element 50 remains dry and undeformed. The first moisture-absorbing deformation element 40 overcomes the elastic force of the elastic element 63 and drives the sealing element 30 to move the vent pipe 62 downwards away from the explosion-proof valve body 20. A gap is created between the sealing element 30 and the explosion-proof valve body 20, releasing the seal on the second opening 21 of the explosion-proof valve body 20, allowing the second opening 21 to connect with the outside and enabling timely drainage of the liquid accumulation in the battery pack. Furthermore, due to the structural thickness of the second moisture-absorbing deformation element 50, it can also limit the downward movement of the vent pipe 62 relative to the explosion-proof valve body 20, preventing the gap between the sealing element 30 and the explosion-proof valve body 20 from becoming too large.

[0066] After the liquid inside the battery pack is discharged, the elastic element 63 drives the air duct 62 under the action of elastic force, which in turn drives the sealing element 30 to move upward toward the explosion-proof valve body 20, so that the sealing element 30 returns to the state of sealing the second opening 21 of the explosion-proof valve body 20, and returns to the first working condition.

[0067] In the third working condition, such as Figure 4 As shown, liquid exists both inside and outside the battery pack without thermal runaway. For example, when the vehicle drives over a puddle or is sprayed with water, a significant amount of liquid inside the battery pack spreads to the location of the second moisture-absorbing deformation element 50. At this time, both the first moisture-absorbing deformation element 40 and the second moisture-absorbing deformation element 50 absorb the liquid and expand. The second moisture-absorbing deformation element 50 drives the vent pipe 62, causing the sealing element 30 to move upwards. This causes the sealing element 30 to move closer to the explosion-proof valve body 20 and seal the second opening 21 of the explosion-proof valve body 20. Specifically, the sealing element 30 abuts against the sealing element 23 on the explosion-proof valve body 20 to seal the second opening 21, thus providing good sealing of the battery pack. This prevents liquid outside the battery pack from flowing back into the battery pack through the second opening 21 of the explosion-proof valve body 20.

[0068] When the vehicle exits a puddle or is no longer subjected to water spray, there is no liquid flowing back into the battery pack, meaning the battery pack is no longer in a situation where external liquid could flow into its interior. As the battery pack generates heat during operation, the liquid absorbed by the first hygroscopic deformation element 40 and the second hygroscopic deformation element 50 vaporizes or evaporates, thus gradually drying the first hygroscopic deformation element 40 and the second hygroscopic deformation element 50 and returning them to their initial state. If liquid still remains inside the battery pack, the battery pack switches to the second operating condition described above. The first hygroscopic deformation element 40 absorbs liquid and expands, driving the sealing element 30 to move the vent pipe assembly away from the explosion-proof valve body 20. This allows the sealing element 30 to release the seal on the second opening 21 of the explosion-proof valve body 20, thereby draining the liquid inside the battery pack.

[0069] In the fourth operating condition, such as Figure 4 As shown, in the event of thermal runaway of the battery pack, gas is ejected from the battery pack. This gas overcomes the elastic force of the elastic element 63, pushing the sealing element 30 and the vent pipe 62 downwards. This creates a gap between the sealing element 30 and the explosion-proof valve body 20, releasing the sealing element 30 from the second opening 21 of the explosion-proof valve body 20, allowing the second opening 21 to connect with the outside and venting the battery pack. After the gas inside the battery pack is expelled, the elastic element 63, under its elastic force, drives the vent pipe 62 to move the sealing element 30 upwards toward the explosion-proof valve body 20, restoring the sealing element 30 to its original blocking state of the second opening 21 of the explosion-proof valve body 20, thus returning to the first operating condition.

[0070] In summary, the explosion-proof valve described in the embodiments of this application may include at least the following advantages:

[0071] In this embodiment, the explosion-proof valve is applied to the housing of a battery pack. The housing has a first opening. The explosion-proof valve includes an explosion-proof valve body, a sealing element, and a first moisture-absorbing deformation element. The explosion-proof valve body has a second opening and is connected to the housing, with the first opening communicating with the second opening. The sealing element covers the second opening and is movably connected to the side of the explosion-proof valve body away from the housing. The first moisture-absorbing deformation element is disposed between the explosion-proof valve body and the sealing element. When liquid is generated inside the battery pack, the first moisture-absorbing deformation element absorbs the liquid and expands, forming a gap between the sealing element and the explosion-proof valve body. The sealing element releases the seal on the second opening of the explosion-proof valve body to drain the liquid. In this way, when liquid accumulates inside the battery pack, some of the liquid can be absorbed by the first moisture-absorbing deformation element. The first moisture-absorbing deformation element expands due to moisture absorption, driving the sealing element to move away from the explosion-proof valve body. This creates a gap between the sealing element and the explosion-proof valve body, allowing the sealing element to release its blockage of the second opening of the explosion-proof valve body, thus opening the second opening to the outside. This allows the liquid inside the battery pack to drain out through the first opening of the housing along the second opening of the explosion-proof valve body, achieving timely drainage of the liquid inside the battery pack. This gives the explosion-proof valve structure a drainage function, reducing the impact on the electrical and safety performance of the battery pack.

[0072] This application also proposes a battery pack, which includes the aforementioned explosion-proof valve. For example, in this application embodiment, the battery pack can be a prismatic battery pack, a cylindrical battery pack, a pouch battery pack, etc. This application embodiment does not limit the specific type of battery pack.

[0073] The battery pack described in this application embodiment may include at least the following advantages:

[0074] In this embodiment, the battery pack includes the aforementioned explosion-proof valve, which is applied to the battery pack housing. The housing has a first opening. The explosion-proof valve includes an explosion-proof valve body, a sealing element, and a first moisture-absorbing deformation element. The explosion-proof valve body has a second opening and is connected to the housing, with the first opening communicating with the second opening. The sealing element covers the second opening and is movably connected to the side of the explosion-proof valve body away from the housing. The first moisture-absorbing deformation element is disposed between the explosion-proof valve body and the sealing element. When liquid is generated inside the battery pack, the first moisture-absorbing deformation element absorbs the liquid and expands, forming a gap between the sealing element and the explosion-proof valve body. The sealing element releases the seal on the second opening of the explosion-proof valve body to drain the liquid. In this way, when liquid accumulates inside the battery pack, some of the liquid can be absorbed by the first moisture-absorbing deformation element. The first moisture-absorbing deformation element expands due to moisture absorption, driving the sealing element to move away from the explosion-proof valve body. This creates a gap between the sealing element and the explosion-proof valve body, allowing the sealing element to release its blockage of the second opening of the explosion-proof valve body, thus opening the second opening to the outside. This allows the liquid inside the battery pack to drain out through the first opening of the housing along the second opening of the explosion-proof valve body, achieving timely drainage of the liquid inside the battery pack. This gives the explosion-proof valve structure a drainage function, reducing the impact on the electrical and safety performance of the battery pack.

[0075] This application also proposes a vehicle that includes the aforementioned battery pack.

[0076] Optionally, the explosion-proof valve body 20 of the battery pack is connected to the bottom of the housing 10, which is the side of the housing 10 closest to the vehicle chassis. Specifically, the vehicle chassis is positioned close to the ground. This allows the high-temperature, high-pressure gas inside the battery pack to be discharged towards the ground when the explosion-proof valve structure releases it. This avoids placing the explosion-proof valve structure on the side or top of the battery pack, reducing damage to other structures inside the vehicle from the high-temperature, high-pressure gas, and also reducing the risk of burns and safety hazards to passengers.

[0077] For example, in the embodiments of this application, the vehicle may include small cars, medium-sized cars, sedans, trucks, trailers, CDVs (Car Derived Vans), MPVs (multi-Purpose Vehicles), SUVs (Sport Utility Vehicles), etc. The specific type of vehicle is not limited in the embodiments of this application.

[0078] The vehicle described in this application embodiment may include at least the following advantages:

[0079] In this embodiment, the vehicle includes the battery pack, which includes: a housing, an explosion-proof valve body, a sealing element, and a first moisture-absorbing deformation element; the housing has a first opening, the explosion-proof valve body has a second opening, the explosion-proof valve body is connected to the housing, and the first opening communicates with the second opening; the sealing element covers the second opening and is movably connected to the side of the explosion-proof valve body away from the housing; the first moisture-absorbing deformation element is disposed between the explosion-proof valve body and the sealing element; when liquid is generated in the battery pack, the first moisture-absorbing deformation element absorbs the liquid and expands, a gap is formed between the sealing element and the explosion-proof valve body, and the sealing element releases the seal on the second opening of the explosion-proof valve body to drain the liquid. In this way, when liquid accumulates inside the battery pack, some of the liquid can be absorbed by the first moisture-absorbing deformation element. The first moisture-absorbing deformation element expands due to moisture absorption, driving the sealing element to move away from the explosion-proof valve body. This creates a gap between the sealing element and the explosion-proof valve body, allowing the sealing element to release its blockage of the second opening of the explosion-proof valve body, thus opening the second opening to the outside. This allows the liquid inside the battery pack to drain out through the first opening of the housing along the second opening of the explosion-proof valve body, achieving timely drainage of the liquid inside the battery pack. This gives the explosion-proof valve structure a drainage function, reducing the impact on the electrical and safety performance of the battery pack.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve, applied to the housing (10) of a battery pack, the housing (10) having a first opening (11), characterized in that, The explosion-proof valve includes: an explosion-proof valve body (20), a sealing component (30), and a first moisture-absorbing deformation component (40); The explosion-proof valve body (20) is provided with a second opening (21), the explosion-proof valve body (20) is connected to the housing (10), and the first opening (11) communicates with the second opening (21); The sealing element (30) covers the second opening (21) and is movably connected to the side of the explosion-proof valve body (20) away from the housing (10); The first moisture-absorbing deformation element (40) is disposed between the explosion-proof valve body (20) and the sealing element (30); When liquid is generated inside the battery pack, the first moisture-absorbing deformation member (40) absorbs the liquid and expands, and a gap is formed between the sealing member (30) and the explosion-proof valve body (20). The sealing member (30) releases the seal on the second opening (21) of the explosion-proof valve body (20) to discharge the liquid.

2. The explosion-proof valve according to claim 1, characterized in that, The explosion-proof valve also includes a gas guide tube assembly and a second moisture-absorbing deformation element (50); The air duct assembly is connected to the sealing member (30), and the air duct assembly is slidably connected to the explosion-proof valve body (20). The second moisture-absorbing deformation member (50) is disposed between the air duct assembly and the explosion-proof valve body (20). When liquid is generated inside the battery pack and there is liquid outside the battery pack, the first moisture-absorbing deformation member (40) and the second moisture-absorbing deformation member (50) absorb the liquid and expand. The second moisture-absorbing deformation member (50) drives the air duct assembly to move the sealing member (30) toward the explosion-proof valve body (20) so that the sealing member (30) seals the second opening (21) of the explosion-proof valve body (20).

3. The explosion-proof valve according to claim 2, characterized in that, The explosion-proof valve body (20) has an installation groove (22) on the side away from the sealing member (30), and the second moisture-absorbing deformation member (50) is located in the installation groove (22) and connected to the air guide pipe assembly; When the second moisture-absorbing deformation element (50) absorbs liquid and expands, the second moisture-absorbing deformation element (50) drives the air guide tube assembly to slide away from the explosion-proof valve body (20), so as to drive the sealing element (30) to move toward the explosion-proof valve body (20).

4. The explosion-proof valve according to claim 3, characterized in that, The air duct assembly has a groove (61) at a position corresponding to the mounting groove (22). The mounting groove (22) and the groove (61) enclose a receiving space (601), and the second moisture-absorbing deformation member (50) is disposed in the receiving space (601).

5. The explosion-proof valve according to claim 2, characterized in that, The air duct assembly includes an air duct (62) and an elastic element (63); The air guide tube (62) is slidably connected to the explosion-proof valve body (20), and the air guide tube (62) extends away from the sealing member (30). One end of the elastic member (63) is connected to the explosion-proof valve body (20), and the other end of the elastic member (63) is connected to the air guide tube (62).

6. The explosion-proof valve according to claim 5, characterized in that, The air guide tube (62) includes a sliding part (64) and a connecting part (65) connected to the sliding part (64); The sliding part (64) is connected to the sealing member (30), and the sliding part (64) is slidably connected to the explosion-proof valve body (20). The connecting part (65) extends away from the sealing member (30), and the other end of the elastic member (63) is connected to the connecting part (65).

7. The explosion-proof valve according to claim 2, characterized in that, The first moisture-absorbing deformation element (40) has a water absorption swelling rate of a first water absorption swelling rate, and the second moisture-absorbing deformation element (50) has a water absorption swelling rate of a second water absorption swelling rate, wherein the second water absorption swelling rate is greater than the first water absorption swelling rate.

8. The explosion-proof valve according to claim 1, characterized in that, The explosion-proof valve also includes a sealing element (23), which is disposed between the explosion-proof valve body (20) and the plugging element (30), and the sealing element (23) is connected to the outer periphery of the second opening (21) of the explosion-proof valve body (20); When the plugging member (30) is plugged into the second opening (21) of the explosion-proof valve body (20), the plugging member (30) is pressed against the sealing member (23) to seal the second opening (21).

9. A battery pack, characterized in that, The battery pack includes the explosion-proof valve as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes the battery pack as described in claim 9.

11. The vehicle according to claim 10, characterized in that, The explosion-proof valve body (20) of the explosion-proof valve is connected to the bottom of the housing (10), and the bottom of the housing (10) is the side of the housing (10) close to the chassis of the vehicle.

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