Explosion-proof valve and battery pack

Abstract

The utility model discloses an anti-explosion valve and a battery pack, the anti-explosion valve comprises a mounting seat, a valve body, a valve core, a valve core and a valve core, the mounting seat is provided with a ventilation channel; the cover body is arranged on the mounting seat in a covering manner; the moisture blocking piece is arranged on the mounting seat and covers one end of the ventilation channel in an openable manner; the non-return assembly is arranged between the mounting seat and the cover body and is used for preventing the cover body from moving towards the mounting seat; and the protection assembly is arranged at the other end of the ventilation channel. According to the explosion-proof valve, the check assembly is arranged, after the explosion-proof valve reaches a certain stroke, the valve body is locked to prevent the valve body from rebounding, the maximum ventilation rate of the explosion-proof valve is effectively guaranteed, the explosion-proof valve is prevented from being automatically closed after pressure is reduced, the safety of a battery is improved, manual misoperation is effectively prevented through the protection assembly, and the safety of the battery is improved. Therefore, the breathable film is prevented from being damaged or the anti-explosion valve is prevented from being opened, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to an explosion-proof valve and a battery pack. Background Art

[0002] Relevant technologies point out that with the rise of new energy vehicles, there are many different designs for battery packs. Factors such as energy density and electric vehicle platform determine different battery pack designs. With the acceleration of industrialization of the power electricity industry, the safety design of battery packs has become a hot topic of current research. For example, how to improve the electrical safety and thermal runaway safety of battery packs are directly related to the design of explosion-proof valves.

[0003] Existing explosion-proof valves for ternary battery packs mostly use spring-loaded ruptures, which allow for a large amount of post-explosion ventilation. This rupture occurs by compressing and deforming the spring to push open the valve cover. When the battery pack experiences thermal runaway, the instantaneous pressure is high, causing the valve to open to its maximum extent. However, as the pressure decreases, the valve opening decreases, and the exhaust rate also decreases. During the installation of conventional explosion-proof valves, manual installation carries the risk of accidentally touching the valve's vent membrane, potentially rendering it inoperable. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides an explosion-proof valve with an ingenious structural design and a high safety factor.

[0005] The utility model also provides a battery pack having the above explosion-proof valve.

[0006] According to the first aspect of the present invention, the explosion-proof valve includes: a mounting seat, which is formed with a ventilation channel; a cover body, which is arranged on the mounting seat; a moisture-blocking member, which is arranged on the mounting seat and can be opened to seal one end of the ventilation channel; a check assembly, which is arranged between the mounting seat and the cover body and is used to prevent the cover body from moving toward the mounting seat; and a protective assembly, which is arranged at the other end of the ventilation channel.

[0007] According to the explosion-proof valve of the present invention, a check assembly is provided, and after the explosion-proof valve reaches a certain stroke, the valve body is locked to prevent the valve body from rebounding, thereby effectively ensuring the maximum ventilation rate of the explosion-proof valve, preventing the explosion-proof valve from automatically closing after the pressure is reduced, and improving the safety of the battery. By providing a protective assembly, human error is effectively prevented, thereby avoiding damage to the breathable membrane or opening of the explosion-proof valve, improving production efficiency and reducing production costs.

[0008] In some embodiments, the check assembly includes: a first check piece and a second check piece, the first check piece is arranged on a side of the moisture-blocking piece away from the ventilation channel, and the second check piece is movably connected to the first check piece.

[0009] In some embodiments, a first check portion is formed on the first check piece, and a second check portion is formed on the second check piece. The first check portion is formed as a check protrusion, and the second check portion is formed as a check groove. The check protrusion is suitable for extending into the check groove.

[0010] In some embodiments, the non-return groove and the non-return protrusion are both formed with guide surfaces, and the guide surface of the non-return groove and the guide surface of the non-return protrusion cooperate with each other to facilitate the non-return protrusion to slide out of the non-return groove.

[0011] In some embodiments, an elastic member is provided between the cover and the second check member, and the elastic member always has a force to move the second check member toward the first check member.

[0012] In some embodiments, a through hole is formed on the cover body, and a push rod is formed on the second check member. The push rod is located in the through hole and is disposed beyond the surface of the cover body.

[0013] In some embodiments, the protective assembly includes: a fixing ring and a protective net, the protective net covers the fixing ring, and the protective net is located on the side of the fixing ring away from the ventilation channel, the inner wall of the fixing ring is formed with a thread, and the fixing ring is threadedly connected to the mounting seat.

[0014] In some embodiments, the protective net includes a plurality of ribs, the plurality of ribs enclose a plurality of air holes, and the plurality of ribs can undergo elastic deformation.

[0015] In some embodiments, the explosion-proof valve further includes: a main body, the first check member is provided on the main body, a first sealing member is provided between the main body and the mounting seat, and a second sealing member is provided between the moisture-blocking member and the mounting seat.

[0016] The battery pack according to the second aspect of the present invention includes the explosion-proof valve according to the first aspect of the present invention.

[0017] According to the battery pack of the present invention, by providing the explosion-proof valve of the first aspect, the safety and durability of the battery pack are improved, and the production cost of the battery pack is reduced.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of an explosion-proof valve according to an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the installation of explosion-proof valve and housing shown in;

[0021] Figure 3 yes Figure 2 Schematic diagram of installation of explosion-proof valve and housing at another angle shown in ;

[0022] Figure 4 yes Figure 3 A schematic cross-sectional view at AA is shown in FIG;

[0023] Figure 5 yes Figure 1 The assembly diagram of the protection component is shown in FIG.

[0024] Reference numerals:

[0025] 100. Explosion-proof valve; 1. Mounting seat; 11. Ventilation channel; 2. Cover; 21. Through hole; 22. Elastic member; 3. Moisture-blocking member; 4. Check assembly; 41. First check member; 411. Check protrusion; 42. Second check member; 421. Check groove; 422. Push rod; 43. Guide surface; 5. Protection assembly; 51. Fixing ring; 52. Protection net; 53. Bracket; 6. Main body; 7. First sealing member; 8. Second sealing member; 200. Housing. DETAILED DESCRIPTION

[0026] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] Reference below Figure 1-Figure 5 An explosion-proof valve 100 according to an embodiment of the first aspect of the present invention is described.

[0028] like Figure 1 As shown, the explosion-proof valve 100 according to the embodiment of the first aspect of the present utility model includes: a mounting seat 1, a cover body 2, a moisture-blocking component 3, a check assembly 4 and a protective assembly 5.

[0029] Specifically, the mounting base 1 is formed with a vent channel 11. A cover 2 is mounted on the mounting base 1. A moisture barrier 3 is mounted on the mounting base 1 and releasably covers one end of the vent channel 11. A check assembly 4 is positioned between the mounting base 1 and the cover 2 to prevent the cover 2 from moving toward the mounting base 1. A protective assembly 5 is positioned at the other end of the vent channel 11. It is understood that when thermal runaway occurs, high-temperature gases flow out of the battery through the vent channel 11. The moisture barrier 3 covers one end of the vent channel 11. When not in operation, the moisture barrier 3 seals one end of the vent channel 11, preventing external moisture or other contaminants from entering the explosion-proof valve 100 or the battery. When the pressure within the battery reaches a certain level, the moisture barrier 3 opens, allowing gas to pass through, thereby reducing the pressure within the battery. The protective assembly 5 prevents foreign matter from entering the battery while allowing airflow. Furthermore, the protective assembly 5 effectively protects the interior of the explosion-proof valve 100, preventing damage to the explosion-proof valve 100 due to human error.

[0030] According to the explosion-proof valve 100 of the embodiment of the present invention, by providing a check assembly 4, after the explosion-proof valve 100 reaches a certain stroke, the valve body is locked to prevent the valve body from rebounding, thereby effectively ensuring the maximum air permeability rate of the explosion-proof valve 100, preventing the explosion-proof valve 100 from automatically closing after the pressure is reduced, and improving the safety of the battery. By providing a protective assembly 5, human error is effectively prevented, thereby avoiding damage to the breathable membrane or opening of the explosion-proof valve 100, improving production efficiency and reducing production costs.

[0031] In some embodiments of the present invention, Figure 4 As shown, the check assembly 4 includes a first check member 41 and a second check member 42. The first check member 41 is located on the side of the moisture barrier 3 facing away from the vent 11, and the second check member 42 is movably connected to the first check member 41. It is understood that the first check member 41 ensures that when the internal pressure increases to a certain level, the lid 2 opens in a one-way motion, preventing it from closing easily, keeping the vent 11 connected to the outside world until the pressure drops to a safe level. Furthermore, the second check member 42 cooperates with the first check member 41 to further lock the lid 2 in the open state and reset it to its initial sealed position. Thus, the first check member 41 and the second check member 42 cooperate to improve the safety of the explosion-proof valve 100, ensuring its effective operation under various operating conditions.

[0032] In some embodiments of the present invention, a first check member 41 is formed with a first check portion, and a second check member 42 is formed with a second check portion. The first check portion is formed as a check protrusion 411, and the second check portion is formed as a check groove 421. The check protrusion 411 is adapted to extend into the check groove 421. In other words, the check groove 421 on the second check member 42 is used to accommodate the check protrusion 411 on the first check member 41, ensuring the stability of the check assembly 4. Furthermore, the check protrusion 411 and the check groove 421 have a simple structure and an ingenious design. When thermal runaway occurs within the battery, the check protrusion 411 moves relative to the check groove 421 in a direction away from the mounting base 1. When the check protrusion 411 is completely outside the check groove 421, the explosion-proof valve 100 is fully opened, thereby improving the reliability and safety of the battery.

[0033] In some embodiments of the present invention, Figure 1 and Figure 4 As shown, both the non-return groove 421 and the non-return protrusion 411 are formed with a guide surface 43. The guide surface 43 of the non-return groove 421 cooperates with the guide surface 43 of the non-return protrusion 411 to facilitate the non-return protrusion 411 to slide out of the non-return groove 421. It can be understood that the guide surface 43 can ensure that the non-return protrusion 411 slides out of the non-return groove 421 smoothly, reducing the friction when the non-return protrusion 411 enters and exits the non-return groove 421, making the relative movement between the two smoother.

[0034] In some embodiments of the present invention, Figure 4 As shown, an elastic member 22 is provided between the cover body 2 and the second check member 42. The elastic member 22 always exerts a force to move the second check member 42 toward the first check member 41. In other words, the elastic member 22 ensures that the second check member 42 and the first check member 41 always maintain contact. When the check protrusion 411 moves away from the mounting seat 1 relative to the check groove 421, the top wall of the check groove 421 (i.e., the upper part of the second check member 42) contacts the bottom wall of the check protrusion 411, and the first check member 41 and the second check member 42 are abutted and connected. The elastic member 22 provides continuous pressure to maintain the relative position of the first check member 41 and the second check member 42, thereby enhancing the reliability and stability of the explosion-proof valve 100.

[0035] In some embodiments of the present invention, Figure 4As shown, a through hole 21 is formed on the cover body 2, and a push rod 422 is formed on the second check member 42. The push rod 422 is located in the through hole 21 and is arranged beyond the surface of the cover body 2. It is understandable that when the explosion-proof valve 100 needs to be reset, the operator applies force to the push rod 422, thereby causing the check protrusion 411 of the first check member 41 to slide into the check groove 421 of the second check member 42. The push rod 422 provides a direct mechanical connection, ensuring the reliability and immediacy of the reset operation. In addition, the push rod 422 has a simple structure, which reduces manufacturing costs and maintenance difficulties.

[0036] In some embodiments of the present invention, the protective assembly 5 includes: a fixing ring 51 and a protective net 52, the protective net 52 covers the fixing ring 51, and the protective net 52 is located on the side of the fixing ring 51 away from the ventilation channel 11, the inner peripheral wall of the fixing ring 51 is formed with a thread, and the fixing ring 51 is threadedly connected to the mounting base 1. It can be understood that the main function of the protective net 52 is to prevent larger foreign objects (such as dust, debris, insects, etc.) from entering the ventilation channel 11, thereby preventing these foreign objects from causing damage or blockage to the internal structure. In addition, the protective net 52 can also prevent people's fingers or other tools from accidentally reaching into the ventilation channel 11, reducing the risk of misoperation. As a result, not only the overall safety of the explosion-proof valve 100 is enhanced, but also its applicability and durability in various environments are improved.

[0037] like Figure 5 As shown, a bracket 53 is provided on the fixing ring 51 , and the bracket 53 supports the protection component 5 from the surroundings, thereby ensuring the effectiveness of the protection component 5 .

[0038] For example Figure 5 As shown, the mounting seat 1 passes through the mounting hole on the housing 200 and is threadedly connected to the fixing ring 51 , which reduces the difficulty of assembling the explosion-proof valve 100 and improves the assembly efficiency of the explosion-proof valve 100 .

[0039] In some embodiments of the present invention, the protective net 52 includes multiple ribs that enclose multiple ventilation holes, and the ribs are elastically deformable. It is understood that the protective net 52 is woven from multiple ribs made of fire-resistant fiber. This prevents human error from pushing the explosion-proof valve 100 open, prevents the air flow of the explosion-proof valve 100 from being affected, and prevents foreign matter from clogging the explosion-proof valve 100 during thermal runaway.

[0040] In some embodiments of the present invention, Figure 4As shown, explosion-proof valve 100 further includes: a main body 6, a first check member 41 disposed on main body 6, a first seal 7 disposed between main body 6 and mounting seat 1, and a second seal 8 disposed between moisture barrier 3 and mounting seat 1. Specifically, the first seal 7 disposed between main body 6 and mounting seat 1 prevents gas or liquid from leaking through the gap between main body 6 and mounting seat 1, thereby ensuring the airtightness of explosion-proof valve 100. The second seal 8 prevents moisture or other contaminants from entering the interior through the tiny gap between moisture barrier 3 and mounting seat 1. This not only improves the overall sealing performance of explosion-proof valve 100, but also enhances its applicability and durability in various environments.

[0041] The battery pack according to the embodiment of the second aspect of the present invention includes the explosion-proof valve 100 according to the embodiment of the first aspect of the present invention.

[0042] According to the battery pack of the embodiment of the present invention, the explosion-proof valve 100 of the first embodiment is provided, thereby improving the safety and durability of the battery pack and reducing the production cost of the battery pack.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0045] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0047] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve, characterized in that: include: A mounting seat, wherein the mounting seat is formed with a ventilation channel; a cover body, the cover body being arranged on the mounting seat; a moisture-blocking member, the moisture-blocking member being disposed on the mounting seat and openably covering one end of the ventilation channel; a non-return assembly, the non-return assembly being arranged between the mounting seat and the cover body, and being used to prevent the cover body from moving toward the mounting seat; A protection component is provided at the other end of the ventilation channel.

2. The explosion-proof valve according to claim 1, characterized in that: The check assembly includes a first check piece and a second check piece. The first check piece is arranged on a side of the moisture-blocking component away from the ventilation channel. The second check piece is movably connected to the first check piece.

3. The explosion-proof valve according to claim 2, characterized in that: A first non-return portion is formed on the first non-return member, and a second non-return portion is formed on the second non-return member. The first non-return portion is formed as a non-return protrusion, and the second non-return portion is formed as a non-return groove. The non-return protrusion is suitable for extending into the non-return groove.

4. The explosion-proof valve according to claim 3, characterized in that: The non-return groove and the non-return protrusion are both formed with a guide surface, and the guide surface of the non-return groove and the guide surface of the non-return protrusion cooperate with each other to facilitate the non-return protrusion to slide out of the non-return groove.

5. The explosion-proof valve according to claim 4, characterized in that: An elastic member is provided between the cover body and the second return stop member, and the elastic member always has a force to move the second return stop member toward the first return stop member.

6. The explosion-proof valve according to claim 5, characterized in that: A through hole is formed on the cover body, and a push rod is formed on the second check piece. The push rod is located in the through hole and is arranged beyond the surface of the cover body.

7. The explosion-proof valve according to claim 6, characterized in that: The protection assembly includes: a fixing ring and a protection net, the protection net covers the fixing ring, and the protection net is located on the side of the fixing ring away from the ventilation channel, the inner peripheral wall of the fixing ring is formed with a thread, and the fixing ring is threadedly connected to the mounting seat.

8. The explosion-proof valve according to claim 7, characterized in that: The protective net includes a plurality of ribs, which enclose a plurality of air holes and are elastically deformable.

9. The explosion-proof valve according to any one of claims 2 to 8, characterized in that: Also includes: The first check member is arranged on the main body, a first sealing member is arranged between the main body and the mounting seat, and a second sealing member is arranged between the moisture-blocking member and the mounting seat.

10. A battery pack, characterized in that: The explosion-proof valve comprises the explosion-proof valve according to any one of claims 1 to 9.

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