Moisture-proof structure, explosion-proof valve and battery pack

Abstract

The utility model discloses a moisture-proof structure, an anti-explosion valve and a battery pack. The moisture-proof structure comprises a first fixing piece, a second fixing piece and a moisture-proof piece, the moisture blocking piece is arranged between the first fixing piece and the second fixing piece, the moisture blocking piece is provided with a first ventilation part and a second ventilation part, and the flow directions of air flowing through the first ventilation part and the second ventilation part are opposite. Therefore, water vapor entering from the outside can form condensation on the surface of the moisture-proof piece when passing through the moisture-proof piece, so that the water vapor is prevented from entering the battery pack, the condition that an internal circuit of the battery pack is corroded when encountering water is avoided, short circuit or fire in the battery pack is avoided, the service life of the battery pack is prolonged, and the safety and reliability of the battery pack are improved. Meanwhile, when air pressure inside and outside the battery pack is unbalanced, air can pass through the first ventilation part or the second ventilation part to balance the air pressure inside and outside the battery pack in time, and deformation of the battery pack is avoided. The structure for installing the moisture-resistant piece is simple, and the installation reliability of the moisture-resistant piece is improved.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof valve technology, and in particular to a moisture-proof structure, an explosion-proof valve, and a battery pack. Background Technology

[0002] In the existing technology, the breathable membrane inside the explosion-proof valve can only block liquid water. When water vapor enters the battery pack through the breathable membrane, the water vapor comes into contact with the lower-temperature internal components of the battery pack and condenses into water droplets on the surface of the components, causing circuit corrosion inside the battery pack, or even short circuit and fire, thus reducing the safety and reliability of the battery pack. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a moisture-blocking structure that can improve the safety and reliability of a battery pack.

[0004] The second objective of this utility model is to provide an explosion-proof valve, including a cover plate, a main body, and a moisture-blocking structure, wherein the moisture-blocking structure is the moisture-blocking structure of the first aspect embodiment described above.

[0005] The third objective of this invention is to provide a battery pack that includes the moisture-blocking structure of the first aspect embodiment or the explosion-proof valve of the second aspect embodiment.

[0006] According to a first aspect embodiment of the present invention, the moisture-blocking structure includes: a first fixing member, a second fixing member, and a moisture-blocking member. The moisture-blocking member is disposed between the first fixing member and the second fixing member. The moisture-blocking member has a first air-permeable portion and a second air-permeable portion, and the air flowing through the first air-permeable portion and the second air-permeable portion flows in opposite directions.

[0007] According to the moisture-blocking structure of this utility model embodiment, by setting a first vent and a second vent, and ensuring that the airflow through the first vent and the second vent is in opposite directions, water vapor entering from the outside condenses on the surface of the moisture-blocking component when passing through it. This effectively prevents water vapor from entering the battery pack, avoids corrosion of the internal circuitry of the battery pack when exposed to water, prevents short circuits or fires inside the battery pack, extends the battery pack's lifespan, and improves the safety and reliability of the battery pack. Simultaneously, when there is an imbalance in air pressure inside and outside the battery pack, gas can pass through the first vent or the second vent to promptly balance the air pressure inside and outside the battery pack, preventing battery pack deformation. The structure for installing the moisture-blocking component is simple, which helps improve the reliability of the moisture-blocking component installation.

[0008] In some embodiments, at least a portion of the first breathable portion is recessed from the first fastener toward one side of the second fastener along the assembly direction of the moisture-blocking structure; and / or, at least a portion of the second breathable portion is recessed from the second fastener toward one side of the first fastener along the assembly direction of the moisture-blocking structure.

[0009] In some embodiments, the first ventilated portion abuts against the first fixing member, and the second ventilated portion abuts against the second fixing member. Along the assembly direction of the moisture-blocking structure, the cross-sectional area of ​​the first ventilated portion decreases from the first fixing member to the second fixing member; and / or, the cross-sectional area of ​​the second ventilated portion decreases from the second fixing member to the first fixing member.

[0010] In some embodiments, the moisture-blocking component includes: a shaft, with the first ventilated portion and the second ventilated portion respectively connected to the shaft, and the first ventilated portion and the second ventilated portion being symmetrical about the center of the shaft.

[0011] In some embodiments, the length of the shaft along the first direction is greater than the lengths of the first ventilated portion and the second ventilated portion along the first direction.

[0012] In some embodiments, the first fixing member and the second fixing member define two mounting holes, which are opposite each other along a first direction, and the two ends of the shaft respectively engage with the two mounting holes.

[0013] In some embodiments, the first fastener includes a first mounting portion and a first limiting portion, the first limiting portion being connected to the first mounting portion on one side along a second direction, the first limiting portion extending along the outer periphery of the first mounting portion, the first mounting portion and the first limiting portion defining a first stepped portion, and at least a portion of the first ventilated portion abutting against the first stepped portion; the second fastener includes a second mounting portion and a second limiting portion, the second limiting portion being connected to the second mounting portion on one side along a second direction, the second mounting portion and the second limiting portion defining a second stepped portion, and at least a portion of the second ventilated portion abutting against the second stepped portion.

[0014] In some embodiments, the first limiting portion and the second limiting portion are spaced apart along a third direction, and the first mounting portion and the second mounting portion are spaced apart along a second direction, the second direction being perpendicular to the third direction; the first limiting portion and the second mounting portion abut against each other along the circumference of the moisture-blocking structure, and the second limiting portion and the first mounting portion abut against each other along the circumference of the moisture-blocking structure.

[0015] In some embodiments, the first mounting portion has a first through hole, which is opposite to the first venting portion, and the projection of the first through hole along the second direction is located within the projection of the first venting portion along the second direction; the second mounting portion has a second through hole, which is opposite to the second venting portion, and the projection of the second through hole along the second direction is located within the projection of the second venting portion along the second direction.

[0016] In some embodiments, the distance between two surfaces on the adjacent side of the first limiting portion and the second limiting portion is greater than the distance between two surfaces on the opposite side of the first ventilated portion and the second ventilated portion.

[0017] In some embodiments, the first ventilated portion and the second ventilated portion are valves.

[0018] In some embodiments, the moisture-blocking element is an elastic element.

[0019] In some embodiments, the moisture-blocking component is a one-piece molded component.

[0020] According to a second aspect embodiment of the present invention, the explosion-proof valve includes: a cover plate, a main body, and a moisture-blocking structure. The main body is detachably connected to the cover plate, and a breathable membrane is provided on the side of the main body adjacent to the cover plate. The moisture-blocking structure is connected to the main body on the side of the main body away from the cover plate, and the moisture-blocking structure is opposite to the breathable membrane. The moisture-blocking structure is the moisture-blocking structure of the first aspect embodiment described above.

[0021] The battery pack according to a third aspect embodiment of the present invention includes the moisture-proof structure of the first aspect embodiment or the explosion-proof valve of the second aspect embodiment.

[0022] Additional aspects and advantages of this 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

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is an explosion diagram of an explosion-proof valve according to a second aspect embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional schematic diagram of an explosion-proof valve according to a second aspect embodiment of the present utility model;

[0026] Figure 3 This is a schematic diagram of a moisture-blocking structure according to a first aspect embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the moisture-blocking component according to the first aspect embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram from one perspective of the first fixing member according to the first aspect embodiment of the present utility model.

[0029] Figure label:

[0030] 100. Moisture-barrier structure;

[0031] 10. First fixing member; 11. First mounting part; 111. First through hole; 12. First limiting part;

[0032] 20. Second fastener; 21. Second mounting part; 211. Second through hole; 22. Second limiting part;

[0033] 30. Moisture-proof component; 31. First ventilated part; 32. Second ventilated part; 33. Shaft;

[0034] 200. Explosion-proof valve;

[0035] 40. Cover plate; 41. Main body; 42. Breathable membrane;

[0036] A. First direction; B. Second direction; C. Third direction. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-5 The moisture-blocking structure 100 according to an embodiment of the present utility model is described. The moisture-blocking structure 100 includes: a first fixing member 10, a second fixing member 20 and a moisture-blocking member 30.

[0038] like Figure 2 and Figure 3 As shown, the moisture barrier 30 is disposed between the first fixing member 10 and the second fixing member 20. The moisture barrier 30 has a first ventilated part 31 and a second ventilated part 32, and the air flowing through the first ventilated part 31 and the second ventilated part 32 flows in opposite directions.

[0039] The first fixing member 10 and the second fixing member 20 clamp the moisture-blocking member 30 on both sides to achieve the installation of the moisture-blocking member 30, and the first fixing member 10 and the second fixing member 20 are centrally symmetrical about the moisture-blocking member 30. The first venting part 31 is opposite to the first fixing member 10 along the central axis of the moisture-blocking member 30, and the second venting part 32 is opposite to the second fixing member 20 along the central axis of the moisture-blocking member 30. The moisture-blocking member 30 has a centrally symmetrical structure, and the central axis of the moisture-blocking member 30 is the center line passing through the center of symmetry of the moisture-blocking member 30 along its axial direction. The first fixing member 10 and the second fixing member 20 are adapted to fix the moisture-blocking member 30 to the explosion-proof valve 200. The first venting part 31 and the second venting part 32 are configured such that when gas mixed with water vapor enters the explosion-proof valve 200, the first venting part 31 and the second venting part 32 can only allow gas to pass through, and the flow direction of the gas flowing through the first venting part 31 and the second venting part 32 is opposite. For example, when the internal air pressure of the battery pack is too low and reaches the trigger threshold, external gas enters the battery pack through the first vent 31 to balance the pressure difference; when the internal air pressure of the battery pack is too high and reaches the trigger threshold, the gas inside the battery pack is discharged from the battery pack through the second vent 32.

[0040] According to the moisture-blocking structure 100 of this utility model embodiment, the arrangement of the first vent 31 and the second vent 32, with air flowing in opposite directions through them, causes external water vapor to condense on the surface of the moisture-blocking component 30 upon passing through it. This effectively prevents water vapor from entering the battery pack, avoiding corrosion of the internal circuitry due to water contact, preventing short circuits or fires, extending the battery pack's lifespan, and improving its safety and reliability. Simultaneously, when there is an imbalance in air pressure inside and outside the battery pack, gas can pass through the first vent 31 or the second vent 32 to promptly balance the pressure and prevent battery pack deformation. The structure for installing the moisture-blocking component 30 is simple, which helps improve the reliability of its installation.

[0041] According to some embodiments of this utility model, such as Figure 4 As shown, at least a portion of the first vent 31 is recessed from the first fixing member 10 toward the second fixing member 20 along the assembly direction of the moisture-blocking structure 100. That is, at least a portion of the first vent 31 is recessed from the first fixing member 10 toward the second fixing member 20 along the central axis of the moisture-blocking structure 100 to form a groove. This allows water vapor to condense and collect in the groove on the surface of the first vent 31 away from the second fixing member 20 along the central axis of the moisture-blocking structure 100. This facilitates gas passage through the first vent 31 from the area where condensation collects, increasing the contact area between the first vent 31 and the gas, and reducing the resistance to gas entering the battery pack through the first vent 31.

[0042] Optionally, at least a portion of the second vent 32 is recessed from the second fastener 20 toward the first fastener 10 along the assembly direction of the moisture-blocking structure 100. That is, at least a portion of the second vent 32 is recessed from the second fastener 20 toward the first fastener 10 along the central axis of the moisture-blocking structure 100. This increases the contact area between the second vent 32 and the gas, reducing the resistance to gas exiting the battery pack through the second vent 32.

[0043] Optionally, at least a portion of the first vent 31 is recessed from the first fixing member 10 toward the second fixing member 20 along the assembly direction of the moisture-blocking structure 100. Simultaneously, at least a portion of the second vent 32 is recessed from the second fixing member 20 toward the first fixing member 10 along the assembly direction of the moisture-blocking structure 100. In this embodiment, following the airflow direction into the battery pack, external gas flows into the battery pack through the first vent 31, and gas inside the battery pack flows out of the battery pack through the second vent 32. Therefore, to facilitate the collection of condensation, the first vent 31 is recessed toward the center of the battery pack, and the second vent 32 is recessed away from the center of the battery pack.

[0044] Therefore, by setting the first vent 31 to be recessed in the assembly direction of the first fixing member 10 toward the second fixing member 20, the condensation of incoming hot steam can be increased, and the collection of condensation can be achieved, reducing the impact of water vapor entering the battery pack on the use of the battery pack and extending the service life of the moisture barrier structure 100. At the same time, stress concentration in the first vent 31 and the second vent 32 can be avoided, reducing the processing difficulty of the moisture barrier structure 100. Furthermore, the first vent 31 and the second vent 32 are a single structural component, and their central symmetry facilitates the positioning of the first vent 31 and the second vent 32, reduces the assembly process requirements, and improves assembly efficiency.

[0045] According to some embodiments of this utility model, such as Figure 2 As shown, the first vent 31 abuts against the first fixing member 10, and the second vent 32 abuts against the second fixing member 20. Along the assembly direction of the moisture-blocking structure 100, i.e., the direction of the central axis of the moisture-blocking structure 100, the cross-sectional area of ​​the first vent 31 decreases from the first fixing member 10 towards the second fixing member 20. Therefore, when the internal air pressure of the battery pack is low, the speed at which gas passes through the first vent 31 can be further increased, improving the efficiency of balancing the internal and external air pressure of the battery pack, avoiding stress concentration in the first vent 31, and improving the structural strength of the first vent 31. Simultaneously, it facilitates the collection of condensation formed on the surface of the first vent 31 away from the second fixing member 20, preventing condensation from entering the battery pack and causing short circuits or other problems.

[0046] Optionally, the cross-sectional area of ​​the second vent 32 decreases from the second fixing member 20 toward the first fixing member 10. Therefore, when the internal air pressure of the battery pack is high, the speed at which gas passes through the second vent 32 can be further increased, improving the efficiency of balancing the internal and external air pressures of the battery pack, preventing stress concentration in the second vent 32, and enhancing the structural strength of the second vent 32.

[0047] Optionally, the cross-sectional area of ​​the first vent 31 decreases from the first fixing member 10 towards the second fixing member 20, while the cross-sectional area of ​​the second vent 32 decreases from the second fixing member 20 towards the first fixing member 10. This further reduces the resistance of gas passing through the moisture-blocking member 30, improves the efficiency of balancing the internal and external air pressure of the battery pack, and enhances the overall structural strength of the moisture-blocking structure 100, thereby improving the reliability and stability of the moisture-blocking structure 100.

[0048] According to some embodiments of this utility model, such as Figure 4 As shown, the moisture barrier 30 includes: a shaft 33, a first ventilated part 31 and a second ventilated part 32 respectively connected to the shaft 33.

[0049] The shaft 33 is arranged along the first direction A, and the first ventilated part 31 and the second ventilated part 32 are respectively arranged on both sides of the shaft 33 along the third direction C. The projection shape of the first ventilated part 31 and the second ventilated part 32 along the second direction B on the moisture barrier structure 100 is semi-circular. In this embodiment, the first direction A can be the length direction of the shaft 33, and the second direction B is the direction of the central axis of the moisture barrier structure 100.

[0050] Therefore, the first ventilated part 31 and the second ventilated part 32 are respectively connected to the shaft 33, which facilitates the connection of the first ventilated part 31 and the second ventilated part 32 to the first fixing member 10 and the second fixing member 20 through the shaft 33, improves the structural strength and stability of the first ventilated part 31 and the second ventilated part 32, simplifies the structure of the moisture barrier structure 100, and improves the assembly efficiency of the moisture barrier structure 100.

[0051] Furthermore, the first vent 31 and the second vent 32 are symmetrical about the shaft 33. That is, the first vent 31 and the second vent 32 have the same shape and size, and the first vent 31 can be completely overlapped with the second vent 32 by rotating 180° around the first direction A. Thus, by designing the first vent 31 and the second vent 32 as symmetrical about the shaft 33, the structure of the moisture-blocking component 30 is optimized, which can reduce the processing difficulty of the moisture-blocking component 30 and improve the production efficiency and assembly efficiency of the moisture-blocking component 30.

[0052] According to some embodiments of this utility model, such as Figure 4 As shown, the length of the shaft 33 along the first direction A is greater than the lengths of the first vent 31 and the second vent 32 along the first direction A.

[0053] That is, the two ends of the shaft 33 along the first direction A are respectively higher than the two ends of the first ventilated part 31 and the second ventilated part 32 along the first direction A. Therefore, when the moisture-blocking component 30 is disposed between the first fixing member 10 and the second fixing member 20, the shaft 33 can provide a guiding function along the first direction A, which facilitates the installation and fixing of the first ventilated part 31 and the second ventilated part 32 to the first fixing member 10 and the second fixing member 20 respectively, improves assembly efficiency, facilitates the fixing of the moisture-blocking component 30 by the first fixing member 10 and the second fixing member 20, and at the same time, avoids interference between the two ends of the first ventilated part 31 and the second ventilated part 32 along the first direction A and the first fixing member 10 and the second fixing member 20 respectively, avoids damage to the moisture-blocking component 30, and improves the reliability and stability of the moisture-blocking structure 100.

[0054] According to some embodiments of the present invention, the first fixing member 10 and the second fixing member 20 define two mounting holes, which are opposite each other along the first direction A, and the two ends of the shaft 33 respectively cooperate with the two mounting holes.

[0055] After the first fixing member 10 and the second fixing member 20 are assembled along the third direction C, two mounting holes are defined in the first direction A, and the two mounting holes are aligned along the first direction A. The two ends of the shaft 33 along the first direction A respectively mate with the two mounting holes. Thus, by defining two mounting holes by the first fixing member 10 and the second fixing member 20, and by having the two ends of the shaft 33 mate with the two mounting holes respectively, the positioning between the shaft 33 and the first fixing member 10 and the second fixing member 20 can be facilitated, improving the accuracy of the shaft 33 setting and ensuring that the first venting part 31 and the second venting part 32 are aligned with the first fixing member 10 and the second fixing member 20 along the second direction B, respectively.

[0056] In this embodiment, the shaft 33 has two connecting surfaces at both ends along the second direction B. After the two ends of the shaft 33 along the first direction A respectively mate with the two mounting holes, the first fixing member 10 and the second fixing member 20 respectively abut against the two connecting surfaces. A fixed connection can be formed between the shaft 33 and the first fixing member 10 and the second fixing member 20 by providing adhesives between the two connecting surfaces and the first fixing member 10 and the second fixing member 20, or by welding the two connecting surfaces to the first fixing member 10 and the second fixing member 20 respectively.

[0057] According to some embodiments of this utility model, such as Figure 2 and Figure 3As shown, the first fastener 10 includes a first mounting portion 11 and a first limiting portion 12. The first limiting portion 12 is connected to the first mounting portion 11 along one side of the second direction B. The first limiting portion 12 extends along the outer periphery of the first mounting portion 11. The first mounting portion 11 and the first limiting portion 12 define a first stepped portion. At least a portion of the first venting portion 31 abuts against the first stepped portion. The second fastener 20 includes a second mounting portion 21 and a second limiting portion 22. The second limiting portion 22 is connected to the second mounting portion 21 along one side of the second direction B. The second mounting portion 21 and the second limiting portion 22 define a second stepped portion. At least a portion of the second venting portion 32 abuts against the second stepped portion.

[0058] The first mounting portion 11 includes a first surface and a second surface spaced apart along the second direction B. The second surface is the side surface adjacent to the moisture-blocking member 30. A first limiting portion 12 is connected to the second surface of the first mounting portion 11 along the second direction B adjacent to the side of the first mounting portion 11, and the first limiting portion 12 extends along the outer periphery of the first mounting portion 11. A first step portion is formed at the connection between the first mounting portion 11 and the first limiting portion 12. The outer periphery of the first ventilating portion 31 abuts against the first step portion. The second mounting portion 21 includes a third surface and a fourth surface spaced apart along the second direction B. The fourth surface is the side surface adjacent to the moisture-blocking member 30. A second limiting portion 22 is connected to the fourth surface of the second mounting portion 21 along the second direction B adjacent to the side of the second mounting portion 21, and the second limiting portion 22 extends along the outer periphery of the second mounting portion 21. A second step portion is formed at the connection between the second mounting portion 21 and the second limiting portion 22. The outer periphery of the second ventilating portion 32 abuts against the second step portion. The first mounting portion 11 and the first limiting portion 12, along the side adjacent to the second mounting portion 21 and the second limiting portion 22, define mounting holes along the first direction A.

[0059] Therefore, by having at least a portion of the first ventilated part 31 abut against the first stepped part, and at least a portion of the second ventilated part 32 abut against the second stepped part, the connection strength between the first ventilated part 31 and the first fixing member 10 and the connection strength between the second ventilated part 32 and the second fixing member 20 can be improved, providing support and limiting effect for the moisture-blocking member 30, avoiding relative displacement between the moisture-blocking member 30 and the first fixing member 10 and the second fixing member 20, and improving the reliability and stability of the moisture-blocking structure 100.

[0060] According to some embodiments of this utility model, such as Figure 3As shown, the first limiting part 12 and the second limiting part 22 are spaced apart along the third direction C, and the first mounting part 11 and the second mounting part 21 are spaced apart along the second direction B, that is, the direction of the central axis of the moisture barrier structure 100. The second direction B is perpendicular to the third direction C. The first limiting part 12 and the second mounting part 21 abut against the moisture barrier structure 100 in the circumferential direction, and the second limiting part 22 and the first mounting part 11 abut against the moisture barrier structure 100 in the circumferential direction.

[0061] The first fixing member 10 and the second fixing member 20 are engaged in the first direction A. At this time, the first limiting part 12 and the second limiting part 22 are offset in the second direction B and spaced apart in the third direction C. The first mounting part 11 and the second mounting part 21 are offset in the third direction C and spaced apart in the second direction B. The sides of the first limiting part 12 and the second mounting part 21 that are adjacent to each other abut against each other. The sides of the second limiting part 22 and the first mounting part 11 that are adjacent to each other abut against each other.

[0062] Therefore, by having the first limiting part 12 and the second mounting part 21 mutually abut each other on their adjacent sides, and the second limiting part 22 and the first mounting part 11 mutually abut each other on their adjacent sides, the connection strength between the first fixing member 10 and the second fixing member 20 can be improved, so that the first fixing member 10 and the second fixing member 20 can abut against the moisture barrier 30 in the circumferential direction, avoiding relative displacement between the first fixing member 10 and the second fixing member 20, improving the overall structural strength of the moisture barrier structure 100, and improving the stability and reliability of the moisture barrier structure 100.

[0063] According to some embodiments of this utility model, such as Figure 3 and Figure 5 As shown, the first mounting portion 11 has a first through hole 111, which is opposite to the first vent portion 31. The projection of the first through hole 111 along the second direction B is located within the projection of the first vent portion 31 along the second direction B. The second mounting portion 21 has a second through hole 211, which is opposite to the second vent portion 32. The projection of the second through hole 211 along the second direction B is located within the projection of the second vent portion 32 along the second direction B.

[0064] A first through hole 111 penetrates the first mounting portion 11 along the second direction B, and the first through hole 111 is aligned with the first vent portion 31 along the second direction B. The cross-sectional shape of the first through hole 111 along the second direction B is semi-circular, and the diameter of the first through hole 111 is smaller than the diameter of the first vent portion 31. A second through hole 211 penetrates the second mounting portion 21 along the second direction B, and the second through hole 211 is aligned with the second vent portion 32 along the second direction B. The cross-sectional shape of the second through hole 211 along the second direction B is semi-circular, and the diameter of the second through hole 211 is smaller than the diameter of the second vent portion 32. The first through hole 111 and the second through hole 211 are adapted to allow airflow to pass through.

[0065] Therefore, by setting the first through hole 111 and the second through hole 211, the first vent 31 and the second vent 32 can fully contact the gas passing through the first through hole 111 and the second through hole 211, forming the first vent 31 covering the first through hole 111 and the second vent 32 covering the second through hole 211, reducing the possibility of water vapor directly entering the battery pack through the first through hole 111, and further reducing the occurrence of problems such as short circuits caused by water vapor entering.

[0066] According to some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the distance between the two surfaces of the first limiting part 12 and the second limiting part 22 on the side adjacent to each other is greater than the distance between the two surfaces of the first venting part 31 and the second venting part 32 on the side away from each other.

[0067] In this embodiment, the projection shape of the first limiting part 12 and the second limiting part 22 along the second direction B is a semi-circular arc. The diameter of the first limiting part 12 is larger than the diameter of the first ventilated part 31, and the diameter of the second limiting part 22 is larger than the diameter of the second ventilated part 32. This allows the first limiting part 12 and the second limiting part 22 to respectively limit the outer periphery of the first ventilated part 31 and the second ventilated part 32, preventing relative displacement between the first ventilated part 31 and the second ventilated part 32 and the first fixing member 10 and the second fixing member 20.

[0068] Furthermore, the first ventilator 31 and the second ventilator 32 are valves.

[0069] Furthermore, the moisture-blocking component 30 is an elastic component. For example, the moisture-blocking component 30 can be made of elastic materials such as rubber. When the internal air pressure of the battery pack is low and the pressure difference between the inside and outside is greater than the deformation trigger pressure of the first vent 31, the first vent 31 opens, and the outside air enters the battery pack through the first vent 31. Water vapor condenses when it comes into contact with the first vent 31 and gathers at the groove. After the pressure difference is balanced, the first vent 31 elastically deforms and recovers, and the first vent 31 closes. The water droplets condensed on the first vent 31 are discharged from the explosion-proof valve 200 after natural evaporation.

[0070] Furthermore, the moisture-blocking component 30 is a one-piece molded part. As a result, the structure of the moisture-blocking component 30 is relatively simple and the processing difficulty is low, which can effectively improve the processing efficiency of the moisture-blocking structure 100 and reduce the processing cost.

[0071] According to the second aspect embodiment of the present invention, the explosion-proof valve 200, such as Figure 1 and Figure 2As shown, the explosion-proof valve 200 includes: a cover plate 40, a main body 41, and a moisture-blocking structure 100. The main body 41 is detachably connected to the cover plate 40, and a breathable membrane 42 is provided on the side of the main body 41 adjacent to the cover plate 40. The moisture-blocking structure 100 is connected to the main body 41 on the side of the main body 41 away from the cover plate 40. The moisture-blocking structure 100 is opposite to the breathable membrane 42. The moisture-blocking structure 100 is the moisture-blocking structure 100 of the first aspect embodiment described above.

[0072] The moisture barrier structure 100 is aligned with the breathable membrane 42 along the second direction B, and the breathable membrane 42 is adapted to prevent liquid water from entering the battery pack through the explosion-proof valve 200. When the internal air pressure of the battery pack is low and the internal and external pressure difference is greater than the deformation trigger pressure of the first vent 31, the first vent 31 opens. External gas mixed with water vapor passes through the gap between the cover plate 40 and the main body 41, through the breathable membrane 42, and reaches the moisture barrier structure 100. It then enters the first vent 31 through the first through hole 111 of the first fixing member 10. The gas enters the battery pack through the first vent 31 until the internal and external pressure difference of the battery pack is balanced. Water vapor condenses in the first vent 31 and gathers in the groove. After natural evaporation, it is discharged from the explosion-proof valve 200 through the breathable membrane 42 and the gap between the cover plate 40 and the main body 41. When the internal air pressure of the battery pack is high and the internal and external pressure difference is greater than the deformation trigger pressure of the second vent 32, the second vent 32 opens. The gas inside the battery pack passes through the second vent 32, the second through hole 211, and the breathable membrane 42, and is discharged from the explosion-proof valve 200 through the gap between the cover plate 40 and the main body 41 until the internal and external pressure difference of the battery pack is balanced.

[0073] The battery pack according to a third aspect embodiment of the present invention includes the moisture-blocking structure 100 of the first aspect embodiment or the explosion-proof valve 200 of the second aspect embodiment.

[0074] By employing an explosion-proof valve 200 including a moisture-blocking structure 100, the pressure difference between the inside and outside of the battery pack can be quickly balanced, improving the safety and reliability of the battery pack. In extreme cases, when the battery pack experiences thermal runaway, high-temperature and high-pressure gas acts directly on the explosion-proof valve 200, causing the explosion-proof valve 200 to detach from the battery pack as a whole, thus achieving rapid venting.

[0075] Furthermore, based on the required balanced design value of the internal and external pressure difference of the battery pack, the trigger pressure of the first vent 31 and the second vent 32 can be adjusted accordingly. For example, different inlet and outlet trigger pressure differences can be achieved by adjusting the thickness, area ratio, taper, material, etc. of the first vent 31 and the second vent 32.

[0076] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0077] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0078] 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., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0079] Although embodiments of the present 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 present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A moisture-barrier structure (100), characterized in that, include: First fastener (10) and second fastener (20); Moisture-blocking component (30) is disposed between the first fixing component (10) and the second fixing component (20). The moisture-blocking component (30) has a first air-permeable part (31) and a second air-permeable part (32). The air flowing through the first air-permeable part (31) and the second air-permeable part (32) flows in opposite directions.

2. The moisture-blocking structure (100) according to claim 1, characterized in that, At least a portion of the first breathable portion (31) is recessed from the first fastener (10) toward one side of the second fastener (20) along the assembly direction of the moisture-blocking structure (100); and / or, At least a portion of the second breathable portion (32) is recessed from the second fastener (20) toward one side of the first fastener (10) along the assembly direction of the moisture barrier structure (100).

3. The moisture-barrier structure (100) according to claim 1, characterized in that, The first ventilated portion (31) abuts against the first fixing member (10), and the second ventilated portion (32) abuts against the second fixing member (20). Along the assembly direction of the moisture-blocking structure (100), the cross-sectional area of ​​the first ventilated portion (31) decreases from the first fixing member (10) towards the second fixing member (20); and / or, The cross-sectional area of ​​the second vent (32) decreases from the second fastener (20) toward the first fastener (10).

4. The moisture-blocking structure (100) according to claim 1, characterized in that, The moisture-blocking component (30) includes: The shaft (33) has a first vent (31) and a second vent (32) connected to it respectively. The first vent (31) and the second vent (32) are symmetrical about the shaft (33).

5. The moisture-blocking structure (100) according to claim 4, characterized in that, The length of the shaft (33) along the first direction (A) is greater than the lengths of the first ventilated part (31) and the second ventilated part (32) along the first direction (A).

6. The moisture-barrier structure (100) according to claim 4, characterized in that, The first fixing member (10) and the second fixing member (20) define two mounting holes, which are opposite each other along the first direction (A), and the two ends of the shaft (33) respectively engage with the two mounting holes.

7. The moisture-blocking structure (100) according to claim 1, characterized in that, The first fastener (10) includes a first mounting portion (11) and a first limiting portion (12). The first limiting portion (12) is connected to the first mounting portion (11) on one side along the second direction (B). The first limiting portion (12) extends along the outer periphery of the first mounting portion (11). The first mounting portion (11) and the first limiting portion (12) define a first step portion. At least a portion of the first vent (31) abuts against the first step portion. The second fastener (20) includes a second mounting portion (21) and a second limiting portion (22). The second limiting portion (22) is connected to the second mounting portion (21) on one side along the second direction (B). The second mounting portion (21) and the second limiting portion (22) define a second step portion. At least a portion of the second vent (32) abuts against the second step portion.

8. The moisture-barrier structure (100) according to claim 7, characterized in that, The first limiting part (12) and the second limiting part (22) are spaced apart along a third direction (C), and the first mounting part (11) and the second mounting part (21) are spaced apart along a second direction (B), wherein the second direction (B) is perpendicular to the third direction (C); The first limiting part (12) and the second mounting part (21) abut against each other in the circumferential direction of the moisture barrier structure (100), and the second limiting part (22) and the first mounting part (11) abut against each other in the circumferential direction of the moisture barrier structure (100).

9. The moisture-barrier structure (100) according to claim 7, characterized in that, The first mounting portion (11) has a first through hole (111) which is opposite to the first vent portion (31). The projection of the first through hole (111) along the second direction (B) is located within the projection of the first vent portion (31) along the second direction (B). The second mounting portion (21) has a second through hole (211) which is opposite to the second vent portion (32). The projection of the second through hole (211) along the second direction (B) is located within the projection of the second vent portion (32) along the second direction (B).

10. The moisture-barrier structure (100) according to claim 7, characterized in that, The distance between the two surfaces of the first limiting part (12) and the second limiting part (22) on the side adjacent to each other is greater than the distance between the two surfaces of the first ventilating part (31) and the second ventilating part (32) on the side away from each other.

11. The moisture-barrier structure (100) according to claim 1, characterized in that, The first ventilated part (31) and the second ventilated part (32) are valves.

12. The moisture-barrier structure (100) according to claim 1, characterized in that, The moisture-blocking component (30) is an elastic component.

13. The moisture-blocking structure (100) according to any one of claims 1-12, characterized in that, The moisture barrier component (30) is an integrally molded component.

14. An explosion-proof valve (200), characterized in that, include: Cover plate (40); The main body (41) is detachably connected to the cover plate (40), and the main body (41) has a breathable membrane (42) on the side adjacent to the cover plate (40). A moisture-blocking structure (100) is connected to the main body (41) on the side of the main body (41) away from the cover plate (40), the moisture-blocking structure (100) is opposite to the breathable membrane (42), and the moisture-blocking structure (100) is a moisture-blocking structure (100) according to any one of claims 1-13.

15. A battery pack, characterized in that, Includes the moisture-blocking structure (100) according to any one of claims 1-13, or the explosion-proof valve (200) according to claim 14.

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