Explosion-proof valve, battery pack and vehicle

Abstract

The utility model relates to an anti-explosion valve, a battery pack and a vehicle, and relates to the technical field of batteries, the anti-explosion valve comprises a first body, a second body and a ventilation piece; the first body comprises a first face and is provided with a first pressure relief opening penetrating through the first face. The second body comprises a second face and is provided with a second pressure relief opening penetrating through the second face. The ventilation piece is arranged between the first body and the second body and covers the first pressure relief opening and the second pressure relief opening, the ventilation piece is attached to the first face and the second face, and the ventilation piece is used for ensuring the sealing performance of the anti-explosion valve in the normal state; and the ventilation piece explodes to enable high-temperature and high-pressure gas to be discharged through the first pressure relief opening and the second pressure relief opening, so that the pressure relief function of the anti-explosion valve is achieved, and the safety and reliability of the anti-explosion valve are ensured. By means of the arrangement, the number of parts of the anti-explosion valve can be reduced, the weight and occupied space of the anti-explosion valve are reduced, and therefore cost is reduced, and overall light weight of the anti-explosion valve is achieved.

Description

Technical Field

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

[0002] The explosion-proof valves used in battery packs are relatively expensive, and they are also bulky and large. For places where the requirements for the use of explosion-proof valves are not particularly strict, such as battery packs placed under the seats of vehicles, the cost is high and they take up too much space. Utility Model Content

[0003] This application provides an explosion-proof valve, a battery pack, and a vehicle to at least partially solve the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, this application provides an explosion-proof valve, comprising:

[0005] The first body includes a first surface, and the first body has a first pressure relief port that penetrates the first surface.

[0006] The second body includes a second surface disposed opposite to the first surface, and the second body has a second pressure relief port disposed corresponding to the first pressure relief port, the second pressure relief port penetrating the second surface;

[0007] A ventilated component is disposed between the first body and the second body, and covers the first pressure relief port and the second pressure relief port. The ventilated component is respectively attached to the first surface and the second surface.

[0008] Optionally, the venting element is thermo-sealed between the first body and the second body.

[0009] Optionally, the first body has a first melting point, the second body has a second melting point, and the venting element has a third melting point, wherein the first melting point is less than the third melting point, and the second melting point is less than the third melting point.

[0010] Optionally, the breathable component includes a body and a connecting portion, the connecting portion surrounding the body, the body covering the first pressure relief port and the second pressure relief port, the connecting portion being respectively attached to the first surface and the second surface, and the roughness of the connecting portion being greater than the roughness of the body.

[0011] Optionally, the connecting part has at least one through hole, and the first body and the second body on both sides of the through hole are bonded together by hot pressing.

[0012] Optionally, the first body has a first mounting hole, the second body has a second mounting hole, the first mounting hole and the second mounting hole are connected, and both the first mounting hole and the second mounting hole are spaced apart from the venting element.

[0013] The explosion-proof valve includes fasteners, which pass through the first mounting hole and the second mounting hole.

[0014] Optionally, there are multiple first mounting holes and multiple second mounting holes, with multiple first mounting holes spaced apart on the outer periphery of the first pressure relief port and multiple second mounting holes spaced apart on the outer periphery of the second pressure relief port.

[0015] Optionally, the first surface has a first receiving groove surrounding the first pressure relief port, and at least a portion of the vent is located within the first receiving groove;

[0016] The second surface has a second receiving groove surrounding the second pressure relief port, and at least a portion of the vent is located within the second receiving groove.

[0017] According to a second aspect of this application, this application provides a battery pack, comprising:

[0018] The casing has explosion-proof holes;

[0019] The explosion-proof valve mentioned above has an explosion-proof valve cover that seals the explosion-proof hole.

[0020] According to a third aspect of this application, this application provides a vehicle including the aforementioned explosion-proof valve, or the aforementioned battery pack.

[0021] This application provides an explosion-proof valve, including a first body, a second body, and a vent. The first body includes a first surface with a first pressure relief port penetrating through it. The second body includes a second surface opposite to the first surface with a second pressure relief port corresponding to the first pressure relief port, penetrating through it. The vent is disposed between the first and second bodies, covering both the first and second pressure relief ports. The vent is in contact with both the first and second surfaces. Under normal conditions, the vent ensures the sealing of the explosion-proof valve. When thermal runaway occurs in the battery pack, the vent bursts open, allowing high-temperature, high-pressure gas to escape through the first and second pressure relief ports, thereby achieving the pressure relief function of the explosion-proof valve and ensuring its safety and reliability. This design reduces the number of parts, weight, and space occupied by the explosion-proof valve, thus lowering costs and achieving overall lightweighting.

[0022] The battery pack of this application embodiment includes the explosion-proof valve described above. Therefore, the battery pack can have all the technical features and beneficial effects of the explosion-proof valve described above, which will not be repeated here.

[0023] The vehicle in this application embodiment includes the explosion-proof valve or the battery pack described above. Therefore, the vehicle can have all the technical features and beneficial effects of the explosion-proof valve or the battery pack described above, which will not be repeated here.

[0024] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0027] Figure 1 This is an exploded view of the explosion-proof valve provided in an exemplary embodiment of this application;

[0028] Figure 2 This is an exploded view of an explosion-proof valve provided in yet another exemplary embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of the second body provided in an exemplary embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the structure of the ventilated component provided in an exemplary embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the structure of a breathable component provided in another exemplary embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. First body; 2. Second body; 3. Ventilation component; 10. First surface; 11. First pressure relief port; 12. First mounting hole; 20. Second surface; 21. Second pressure relief port; 22. Second mounting hole; 30. Body part; 31. Connecting part; 100. First receiving groove; 200. Second receiving groove; 310. Through hole. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0035] The applicant noted that the explosion-proof valve used in the battery pack is relatively expensive, and the explosion-proof valve is large in weight and size. It is also expensive and takes up too much space in places where the requirements for the use of the explosion-proof valve are not particularly strict, such as battery packs placed under the seats of vehicles.

[0036] In view of this, this application provides an explosion-proof valve, including a first body, a second body, and a venting element. The first body includes a first surface and a first pressure relief port that penetrates the first surface. The second body includes a second surface opposite to the first surface and a second pressure relief port corresponding to the first pressure relief port that penetrates the second surface. The venting element is disposed between the first and second bodies and covers the first and second pressure relief ports. The venting element is in contact with the first and second surfaces respectively. Under normal conditions, the venting element ensures the permeability and sealing of the explosion-proof valve. When thermal runaway occurs in the battery pack, the venting element bursts open to allow high-temperature, high-pressure gas to be discharged through the first and second pressure relief ports, thereby realizing the pressure relief function of the explosion-proof valve and ensuring its safety and reliability. This design reduces the number of parts in the explosion-proof valve, reduces its weight and space occupation, thereby reducing costs and achieving overall lightweighting of the explosion-proof valve.

[0037] The explosion-proof valve, battery pack, and vehicle of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0038] Figure 1 This is an exploded view of the explosion-proof valve provided in an exemplary embodiment of this application; Figure 2 This is an exploded view of an explosion-proof valve provided in yet another exemplary embodiment of this application; Figure 3 This is a schematic diagram of the structure of the second body 2 provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of the structure of the breathable component 3 provided in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the structure of the breathable element 3 provided in another exemplary embodiment of this application.

[0039] Reference Figures 1 to 3This application provides an explosion-proof valve, including a first body 1, a second body 2, and a vent 3. The first body 1 includes a first surface 10 and a first pressure relief port 11 that penetrates the first surface 10. The second body 2 includes a second surface 20 opposite to the first surface 10 and a second pressure relief port 21 corresponding to the first pressure relief port 11 that penetrates the second surface 20. The vent 3 is disposed between the first body 1 and the second body 2 and covers the first pressure relief port 11 and the second pressure relief port 21. The vent 3 is in contact with the first surface 10 and the second surface 20 respectively. The vent 3 is used to ensure the sealing of the explosion-proof valve under normal conditions. When the battery pack experiences thermal runaway, the vent 3 bursts open to allow high-temperature and high-pressure gas to be discharged through the first pressure relief port 11 and the second pressure relief port 21, thereby realizing the pressure relief function of the explosion-proof valve and ensuring the safety and reliability of the explosion-proof valve. This design reduces the number of parts in the explosion-proof valve, as well as its weight and space occupation, thereby lowering costs and achieving overall lightweighting of the explosion-proof valve.

[0040] In some embodiments, refer to Figure 1 and Figure 2 The ventilated component 3 is heat-pressed and sealed between the first body 1 and the second body 2. The first body 1 and the second body 2 are made of thermoplastic materials. Epoxy resin can be selected as the thermoplastic material; it is relatively inexpensive, has strong environmental adaptability, and is generally used in environments between -55℃ and 180℃. It also has good chemical stability and water resistance. Polyurethane can also be selected as the thermoplastic material; it has good flexibility, wear resistance, and certain water and chemical corrosion resistance, with a fast reaction speed and high production efficiency. Different thermoplastic materials can be selected based on their adhesive strength, price, and environmental adaptability. This embodiment utilizes the properties of thermoplastic materials to achieve bonding between the first body 1 and the second body 2 through a hot-pressing process, thereby fixing the ventilated component 3 sandwiched between the first body 1 and the second body 2.

[0041] In some embodiments, the first body 1 has a first melting point, the second body 2 has a second melting point, and the breathable element 3 has a third melting point, wherein the first melting point is lower than the third melting point, and the second melting point is lower than the third melting point. It is understood that the breathable element 3 in this embodiment can be an expanded polytetrafluoroethylene (PTFE) film, which has a high melting point. Because the melting point of the breathable element 3 is higher than that of the first body 1 and the second body 2, and the first body 1 and the second body 2 have lower melting points and excellent adhesive properties, when the first body 1 and the second body 2 reach their melting points and bond together, the structural form of the breathable element 3 remains unchanged, ensuring the integrity and reliability of the breathable element 3.

[0042] In some embodiments, refer to Figure 4The venting component 3 includes a body portion 30 and a connecting portion 31. The connecting portion 31 surrounds the body portion 30, and the body portion 30 covers the first pressure relief port 11 and the second pressure relief port 21. The connecting portion 31 is respectively attached to the first surface 10 and the second surface 20. The roughness of the connecting portion 31 is greater than that of the body portion 30. This configuration, with the surface roughness of the connecting portion 31 being higher than that of the body portion 30, allows for a greater bonding force when the connecting portion 31 is heat-pressed to the first body 1 and the second body 2. This ensures that the venting component 3 is firmly fixed between the first body 1 and the second body 2 during the operation of the explosion-proof valve, preventing easy displacement or detachment and ensuring the structural stability of the explosion-proof valve. From the perspective of sealing and venting performance, the stable connection between the venting component 3 and the first body 1 and the second body 2 allows the body portion 30 to cover the first pressure relief port 11 and the second pressure relief port 21, ensuring good sealing performance under normal operating conditions and preventing gas leakage; when pressure relief is required, it also ensures that the venting component 3 can perform its pressure relief function.

[0043] In some embodiments, the surface roughness of the connecting portion 31 can be increased by polishing. This allows for adjustment of the polishing intensity, time, and range according to actual needs. For areas requiring high bonding strength, the polishing intensity can be increased. In other embodiments, a sodium naphthalene solution treatment can be used to increase the surface roughness of the connecting portion 31. This treatment introduces a microscopic etching effect on the surface of the connecting portion 31, avoiding large local roughness differences and making the bonding between the connecting portion 31 and the first body 1 and the second body 2 more stable and uniform.

[0044] In some embodiments, refer to Figure 5 The connecting part 31 has at least one through hole 310, and the first body 1 and the second body 2 on both sides of the through hole 310 are bonded together by hot pressing. The first body 1 and the second body 2 have low melting points and excellent adhesive properties. When the first body 1 and the second body 2 reach their melting points, the material begins to flow, and some of the material flows into the through hole 310, so that the first body 1 and the second body 2 on both sides of the through hole 310 are bonded to each other, thereby increasing the bonding strength between the venting element 3 and the first body 1 and the second body 2. When the pressure of the explosion-proof valve required by the battery pack is high, the bonding strength between the venting element 3 and the first body 1 and the second body 2 can be adjusted by adjusting the number and position of the through holes 310 to meet the usage requirements under different pressure requirements.

[0045] In some embodiments, the bonding area between the vent element 3 and the first body 1 and the second body 2 can be selected based on the adhesion strength between different thermoplastic materials and the vent element 3, as well as the pressure range of the explosion-proof valve required for the battery pack. Taking a 12V battery pack as an example, the pressure range for lithium iron phosphate is 0.5-1.2 MPa, and the pressure range for ternary lithium iron phosphate is 1.0-1.8 MPa. When the pressure requirement of the explosion-proof valve increases, the bonding area between the vent element 3 and the first body 1 and the second body 2 also increases accordingly.

[0046] In some embodiments, refer to Figures 1 to 3 The first body 1 has a first mounting hole 12, and the second body 2 has a second mounting hole 22. The first mounting hole 12 and the second mounting hole 22 are connected and are spaced apart from the venting element 3. The explosion-proof valve includes fasteners (not shown) that pass through the first mounting hole 12 and the second mounting hole 22. The fasteners can be bolts, and threaded holes are punched in the sidewalls of the first mounting hole 12 and the second mounting hole 22 to install the bolts. This configuration increases the connection strength between the first body 1 and the second body 2 and also secures the first body 1 and the second body 2 to the battery pack.

[0047] In some embodiments, refer to Figures 1 to 3 The first mounting holes 12 are multiple, and the second mounting holes 22 are multiple. The first mounting holes 12 are spaced apart on the outer periphery of the first pressure relief port 11, and the second mounting holes 22 are spaced apart on the outer periphery of the second pressure relief port 21. In this embodiment, there are four first mounting holes 12 and four second mounting holes 22. The four first mounting holes 12 are located around the periphery of the first body 1, and the four second mounting holes 22 are located around the periphery of the second body 2. This arrangement allows for a uniform and stable connection structure between the first body 1 and the second body 2, enhancing the connection strength between them. Furthermore, the multiple first mounting holes 12 and second mounting holes 22 facilitate positioning and operation when installing the explosion-proof valve into the battery pack.

[0048] In some embodiments, refer to Figure 2 The first surface 10 has a first receiving groove 100 surrounding the first pressure relief port 11, and at least a portion of the vent 3 is located within the first receiving groove 100; see reference. Figure 3The second surface 20 has a second receiving groove 200 surrounding the second pressure relief port 21, and at least a portion of the vent 3 is located within the second receiving groove 200. This arrangement ensures accurate positioning of the vent 3 when it is placed, allowing it to accurately seal the first pressure relief port 11 and the second pressure relief port 21, reducing the risk of gas leakage, preventing displacement or shifting of the vent 3 during hot pressing, and ensuring the stability of the connection between the vent 3 and the first body 1 and the second body 2.

[0049] According to a second aspect of this application, this application provides a battery pack including a housing (not shown) and the aforementioned explosion-proof valve, the housing having an explosion-proof hole (not shown), and the explosion-proof valve cover sealing the explosion-proof hole. The explosion-proof valve includes a first body 1, a second body 2, and a vent 3. The first body 1 includes a first surface 10 and a first pressure relief port 11 that penetrates the first surface 10. The second body 2 includes a second surface 20 opposite to the first surface 10 and a second pressure relief port 21 corresponding to the first pressure relief port 11 that penetrates the second surface 20. The vent 3 is disposed between the first body 1 and the second body 2 and covers the first pressure relief port 11 and the second pressure relief port 21. The vent 3 is in contact with the first surface 10 and the second surface 20 respectively. The vent 3 is used to ensure the sealing of the explosion-proof valve under normal conditions. When the battery pack experiences thermal runaway, the vent 3 bursts open to allow high-temperature and high-pressure gas to be discharged through the first pressure relief port 11 and the second pressure relief port 21, thereby realizing the pressure relief function of the explosion-proof valve and ensuring the safety and reliability of the explosion-proof valve. This design reduces the number of parts in the explosion-proof valve, as well as its weight and space occupation, thereby lowering costs and achieving overall lightweighting of the explosion-proof valve.

[0050] In some embodiments, the first body 1 has a first mounting hole 12, and the second body 2 has a second mounting hole 22. The first mounting hole 12 and the second mounting hole 22 communicate with each other and are spaced apart from the venting element 3. The explosion-proof valve includes fasteners that pass through the first mounting hole 12 and the second mounting hole 22. The fasteners can be bolts, and threaded holes are tapped into the sidewalls of the first mounting hole 12 and the second mounting hole 22 to install the bolts. This configuration allows the first body 1 and the second body 2 to be fixed to the housing, thereby achieving a stable connection between the explosion-proof valve and the housing.

[0051] According to a third aspect of this application, this application provides a vehicle that includes the aforementioned explosion-proof valve or the aforementioned battery pack. Therefore, the vehicle can have all the technical features and beneficial effects of the aforementioned explosion-proof valve or the aforementioned battery pack, which will not be repeated here.

[0052] In the description of this application, 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0054] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0055] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An explosion-proof valve, characterized in that, include: A first body includes a first surface, and the first body has a first pressure relief port that penetrates the first surface; The second body includes a second surface disposed opposite to the first surface, and the second body has a second pressure relief port disposed corresponding to the first pressure relief port, the second pressure relief port penetrating the second surface; A breathable component is disposed between the first body and the second body, and covers the first pressure relief port and the second pressure relief port. The breathable component is respectively attached to the first surface and the second surface.

2. The explosion-proof valve according to claim 1, characterized in that, The breathable component is heat-pressed and sealed between the first body and the second body.

3. The explosion-proof valve according to claim 2, characterized in that, The first body has a first melting point, the second body has a second melting point, and the breathable component has a third melting point. The first melting point is less than the third melting point, and the second melting point is less than the third melting point.

4. The explosion-proof valve according to claim 1, characterized in that, The breathable component includes a body and a connecting portion. The connecting portion surrounds the body and covers the first pressure relief port and the second pressure relief port. The connecting portion is respectively attached to the first surface and the second surface, and the roughness of the connecting portion is greater than that of the body.

5. The explosion-proof valve according to claim 4, characterized in that, The connecting part has at least one through hole, and the first body and the second body on both sides of the through hole are bonded together by hot pressing.

6. The explosion-proof valve according to claim 1, characterized in that, The first body has a first mounting hole, the second body has a second mounting hole, the first mounting hole and the second mounting hole are connected, and the first mounting hole and the second mounting hole are spaced apart from the ventilator. The explosion-proof valve includes fasteners that pass through the first mounting hole and the second mounting hole.

7. The explosion-proof valve according to claim 6, characterized in that, The number of first mounting holes is multiple, the number of second mounting holes is multiple, the multiple first mounting holes are spaced apart on the outer periphery of the first pressure relief port, and the multiple second mounting holes are spaced apart on the outer periphery of the second pressure relief port.

8. The explosion-proof valve according to claim 1, characterized in that, The first surface has a first receiving groove, the first receiving groove surrounds the first pressure relief port, and at least a portion of the vent is located within the first receiving groove; The second surface has a second receiving groove surrounding the second pressure relief port, and at least a portion of the vent is located within the second receiving groove.

9. A battery pack, characterized in that, include: The casing has explosion-proof holes; The explosion-proof valve as described in any one of claims 1 to 8, wherein the explosion-proof valve covers the explosion-proof orifice.

10. A vehicle, characterized in that, Includes the explosion-proof valve as described in any one of claims 1 to 8, or the battery pack as described in claim 9.

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